--- /dev/null
+/*
+ * Faraday FOTG210 EHCI-like driver
+ *
+ * Copyright (c) 2013 Faraday Technology Corporation
+ *
+ * Author: Yuan-Hsin Chen <yhchen@faraday-tech.com>
+ * Feng-Hsin Chiang <john453@faraday-tech.com>
+ * Po-Yu Chuang <ratbert.chuang@gmail.com>
+ *
+ * Most of code borrowed from the Linux-3.7 EHCI driver
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/dmapool.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/vmalloc.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/hrtimer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/moduleparam.h>
+#include <linux/dma-mapping.h>
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#include <asm/byteorder.h>
+#include <asm/irq.h>
+#include <asm/unaligned.h>
+
+/*-------------------------------------------------------------------------*/
+#define DRIVER_AUTHOR "Yuan-Hsin Chen"
+#define DRIVER_DESC "FOTG210 Host Controller (EHCI) Driver"
+
+static const char hcd_name[] = "fotg210_hcd";
+
+#undef FOTG210_URB_TRACE
+
+#define FOTG210_STATS
+
+/* magic numbers that can affect system performance */
+#define FOTG210_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */
+#define FOTG210_TUNE_RL_HS 4 /* nak throttle; see 4.9 */
+#define FOTG210_TUNE_RL_TT 0
+#define FOTG210_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */
+#define FOTG210_TUNE_MULT_TT 1
+/*
+ * Some drivers think it's safe to schedule isochronous transfers more than
+ * 256 ms into the future (partly as a result of an old bug in the scheduling
+ * code). In an attempt to avoid trouble, we will use a minimum scheduling
+ * length of 512 frames instead of 256.
+ */
+#define FOTG210_TUNE_FLS 1 /* (medium) 512-frame schedule */
+
+/* Initial IRQ latency: faster than hw default */
+static int log2_irq_thresh; /* 0 to 6 */
+module_param(log2_irq_thresh, int, S_IRUGO);
+MODULE_PARM_DESC(log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
+
+/* initial park setting: slower than hw default */
+static unsigned park;
+module_param(park, uint, S_IRUGO);
+MODULE_PARM_DESC(park, "park setting; 1-3 back-to-back async packets");
+
+/* for link power management(LPM) feature */
+static unsigned int hird;
+module_param(hird, int, S_IRUGO);
+MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us");
+
+#define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
+
+#include "fotg210.h"
+
+/*-------------------------------------------------------------------------*/
+
+#define fotg210_dbg(fotg210, fmt, args...) \
+ dev_dbg(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args)
+#define fotg210_err(fotg210, fmt, args...) \
+ dev_err(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args)
+#define fotg210_info(fotg210, fmt, args...) \
+ dev_info(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args)
+#define fotg210_warn(fotg210, fmt, args...) \
+ dev_warn(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args)
+
+/* check the values in the HCSPARAMS register
+ * (host controller _Structural_ parameters)
+ * see EHCI spec, Table 2-4 for each value
+ */
+static void dbg_hcs_params(struct fotg210_hcd *fotg210, char *label)
+{
+ u32 params = fotg210_readl(fotg210, &fotg210->caps->hcs_params);
+
+ fotg210_dbg(fotg210,
+ "%s hcs_params 0x%x ports=%d\n",
+ label, params,
+ HCS_N_PORTS(params)
+ );
+}
+
+/* check the values in the HCCPARAMS register
+ * (host controller _Capability_ parameters)
+ * see EHCI Spec, Table 2-5 for each value
+ * */
+static void dbg_hcc_params(struct fotg210_hcd *fotg210, char *label)
+{
+ u32 params = fotg210_readl(fotg210, &fotg210->caps->hcc_params);
+
+ fotg210_dbg(fotg210,
+ "%s hcc_params %04x uframes %s%s\n",
+ label,
+ params,
+ HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
+ HCC_CANPARK(params) ? " park" : "");
+}
+
+static void __maybe_unused
+dbg_qtd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd)
+{
+ fotg210_dbg(fotg210, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
+ hc32_to_cpup(fotg210, &qtd->hw_next),
+ hc32_to_cpup(fotg210, &qtd->hw_alt_next),
+ hc32_to_cpup(fotg210, &qtd->hw_token),
+ hc32_to_cpup(fotg210, &qtd->hw_buf[0]));
+ if (qtd->hw_buf[1])
+ fotg210_dbg(fotg210, " p1=%08x p2=%08x p3=%08x p4=%08x\n",
+ hc32_to_cpup(fotg210, &qtd->hw_buf[1]),
+ hc32_to_cpup(fotg210, &qtd->hw_buf[2]),
+ hc32_to_cpup(fotg210, &qtd->hw_buf[3]),
+ hc32_to_cpup(fotg210, &qtd->hw_buf[4]));
+}
+
+static void __maybe_unused
+dbg_qh(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
+{
+ struct fotg210_qh_hw *hw = qh->hw;
+
+ fotg210_dbg(fotg210, "%s qh %p n%08x info %x %x qtd %x\n", label,
+ qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current);
+ dbg_qtd("overlay", fotg210, (struct fotg210_qtd *) &hw->hw_qtd_next);
+}
+
+static void __maybe_unused
+dbg_itd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_itd *itd)
+{
+ fotg210_dbg(fotg210, "%s[%d] itd %p, next %08x, urb %p\n",
+ label, itd->frame, itd, hc32_to_cpu(fotg210, itd->hw_next),
+ itd->urb);
+ fotg210_dbg(fotg210,
+ " trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
+ hc32_to_cpu(fotg210, itd->hw_transaction[0]),
+ hc32_to_cpu(fotg210, itd->hw_transaction[1]),
+ hc32_to_cpu(fotg210, itd->hw_transaction[2]),
+ hc32_to_cpu(fotg210, itd->hw_transaction[3]),
+ hc32_to_cpu(fotg210, itd->hw_transaction[4]),
+ hc32_to_cpu(fotg210, itd->hw_transaction[5]),
+ hc32_to_cpu(fotg210, itd->hw_transaction[6]),
+ hc32_to_cpu(fotg210, itd->hw_transaction[7]));
+ fotg210_dbg(fotg210,
+ " buf: %08x %08x %08x %08x %08x %08x %08x\n",
+ hc32_to_cpu(fotg210, itd->hw_bufp[0]),
+ hc32_to_cpu(fotg210, itd->hw_bufp[1]),
+ hc32_to_cpu(fotg210, itd->hw_bufp[2]),
+ hc32_to_cpu(fotg210, itd->hw_bufp[3]),
+ hc32_to_cpu(fotg210, itd->hw_bufp[4]),
+ hc32_to_cpu(fotg210, itd->hw_bufp[5]),
+ hc32_to_cpu(fotg210, itd->hw_bufp[6]));
+ fotg210_dbg(fotg210, " index: %d %d %d %d %d %d %d %d\n",
+ itd->index[0], itd->index[1], itd->index[2],
+ itd->index[3], itd->index[4], itd->index[5],
+ itd->index[6], itd->index[7]);
+}
+
+static int __maybe_unused
+dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
+{
+ return scnprintf(buf, len,
+ "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
+ label, label[0] ? " " : "", status,
+ (status & STS_ASS) ? " Async" : "",
+ (status & STS_PSS) ? " Periodic" : "",
+ (status & STS_RECL) ? " Recl" : "",
+ (status & STS_HALT) ? " Halt" : "",
+ (status & STS_IAA) ? " IAA" : "",
+ (status & STS_FATAL) ? " FATAL" : "",
+ (status & STS_FLR) ? " FLR" : "",
+ (status & STS_PCD) ? " PCD" : "",
+ (status & STS_ERR) ? " ERR" : "",
+ (status & STS_INT) ? " INT" : ""
+ );
+}
+
+static int __maybe_unused
+dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
+{
+ return scnprintf(buf, len,
+ "%s%sintrenable %02x%s%s%s%s%s%s",
+ label, label[0] ? " " : "", enable,
+ (enable & STS_IAA) ? " IAA" : "",
+ (enable & STS_FATAL) ? " FATAL" : "",
+ (enable & STS_FLR) ? " FLR" : "",
+ (enable & STS_PCD) ? " PCD" : "",
+ (enable & STS_ERR) ? " ERR" : "",
+ (enable & STS_INT) ? " INT" : ""
+ );
+}
+
+static const char *const fls_strings[] = { "1024", "512", "256", "??" };
+
+static int
+dbg_command_buf(char *buf, unsigned len, const char *label, u32 command)
+{
+ return scnprintf(buf, len,
+ "%s%scommand %07x %s=%d ithresh=%d%s%s%s "
+ "period=%s%s %s",
+ label, label[0] ? " " : "", command,
+ (command & CMD_PARK) ? " park" : "(park)",
+ CMD_PARK_CNT(command),
+ (command >> 16) & 0x3f,
+ (command & CMD_IAAD) ? " IAAD" : "",
+ (command & CMD_ASE) ? " Async" : "",
+ (command & CMD_PSE) ? " Periodic" : "",
+ fls_strings[(command >> 2) & 0x3],
+ (command & CMD_RESET) ? " Reset" : "",
+ (command & CMD_RUN) ? "RUN" : "HALT"
+ );
+}
+
+static char
+*dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status)
+{
+ char *sig;
+
+ /* signaling state */
+ switch (status & (3 << 10)) {
+ case 0 << 10:
+ sig = "se0";
+ break;
+ case 1 << 10:
+ sig = "k";
+ break; /* low speed */
+ case 2 << 10:
+ sig = "j";
+ break;
+ default:
+ sig = "?";
+ break;
+ }
+
+ scnprintf(buf, len,
+ "%s%sport:%d status %06x %d "
+ "sig=%s%s%s%s%s%s%s%s",
+ label, label[0] ? " " : "", port, status,
+ status>>25,/*device address */
+ sig,
+ (status & PORT_RESET) ? " RESET" : "",
+ (status & PORT_SUSPEND) ? " SUSPEND" : "",
+ (status & PORT_RESUME) ? " RESUME" : "",
+ (status & PORT_PEC) ? " PEC" : "",
+ (status & PORT_PE) ? " PE" : "",
+ (status & PORT_CSC) ? " CSC" : "",
+ (status & PORT_CONNECT) ? " CONNECT" : "");
+ return buf;
+}
+
+/* functions have the "wrong" filename when they're output... */
+#define dbg_status(fotg210, label, status) { \
+ char _buf[80]; \
+ dbg_status_buf(_buf, sizeof(_buf), label, status); \
+ fotg210_dbg(fotg210, "%s\n", _buf); \
+}
+
+#define dbg_cmd(fotg210, label, command) { \
+ char _buf[80]; \
+ dbg_command_buf(_buf, sizeof(_buf), label, command); \
+ fotg210_dbg(fotg210, "%s\n", _buf); \
+}
+
+#define dbg_port(fotg210, label, port, status) { \
+ char _buf[80]; \
+ fotg210_dbg(fotg210, "%s\n", dbg_port_buf(_buf, sizeof(_buf), label, port, status) ); \
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* troubleshooting help: expose state in debugfs */
+
+static int debug_async_open(struct inode *, struct file *);
+static int debug_periodic_open(struct inode *, struct file *);
+static int debug_registers_open(struct inode *, struct file *);
+static int debug_async_open(struct inode *, struct file *);
+
+static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
+static int debug_close(struct inode *, struct file *);
+
+static const struct file_operations debug_async_fops = {
+ .owner = THIS_MODULE,
+ .open = debug_async_open,
+ .read = debug_output,
+ .release = debug_close,
+ .llseek = default_llseek,
+};
+static const struct file_operations debug_periodic_fops = {
+ .owner = THIS_MODULE,
+ .open = debug_periodic_open,
+ .read = debug_output,
+ .release = debug_close,
+ .llseek = default_llseek,
+};
+static const struct file_operations debug_registers_fops = {
+ .owner = THIS_MODULE,
+ .open = debug_registers_open,
+ .read = debug_output,
+ .release = debug_close,
+ .llseek = default_llseek,
+};
+
+static struct dentry *fotg210_debug_root;
+
+struct debug_buffer {
+ ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
+ struct usb_bus *bus;
+ struct mutex mutex; /* protect filling of buffer */
+ size_t count; /* number of characters filled into buffer */
+ char *output_buf;
+ size_t alloc_size;
+};
+
+#define speed_char(info1)({ char tmp; \
+ switch (info1 & (3 << 12)) { \
+ case QH_FULL_SPEED: \
+ tmp = 'f'; break; \
+ case QH_LOW_SPEED: \
+ tmp = 'l'; break; \
+ case QH_HIGH_SPEED: \
+ tmp = 'h'; break; \
+ default: \
+ tmp = '?'; break; \
+ } tmp; })
+
+static inline char token_mark(struct fotg210_hcd *fotg210, __hc32 token)
+{
+ __u32 v = hc32_to_cpu(fotg210, token);
+
+ if (v & QTD_STS_ACTIVE)
+ return '*';
+ if (v & QTD_STS_HALT)
+ return '-';
+ if (!IS_SHORT_READ(v))
+ return ' ';
+ /* tries to advance through hw_alt_next */
+ return '/';
+}
+
+static void qh_lines(
+ struct fotg210_hcd *fotg210,
+ struct fotg210_qh *qh,
+ char **nextp,
+ unsigned *sizep
+)
+{
+ u32 scratch;
+ u32 hw_curr;
+ struct fotg210_qtd *td;
+ unsigned temp;
+ unsigned size = *sizep;
+ char *next = *nextp;
+ char mark;
+ __le32 list_end = FOTG210_LIST_END(fotg210);
+ struct fotg210_qh_hw *hw = qh->hw;
+
+ if (hw->hw_qtd_next == list_end) /* NEC does this */
+ mark = '@';
+ else
+ mark = token_mark(fotg210, hw->hw_token);
+ if (mark == '/') { /* qh_alt_next controls qh advance? */
+ if ((hw->hw_alt_next & QTD_MASK(fotg210))
+ == fotg210->async->hw->hw_alt_next)
+ mark = '#'; /* blocked */
+ else if (hw->hw_alt_next == list_end)
+ mark = '.'; /* use hw_qtd_next */
+ /* else alt_next points to some other qtd */
+ }
+ scratch = hc32_to_cpup(fotg210, &hw->hw_info1);
+ hw_curr = (mark == '*') ? hc32_to_cpup(fotg210, &hw->hw_current) : 0;
+ temp = scnprintf(next, size,
+ "qh/%p dev%d %cs ep%d %08x %08x(%08x%c %s nak%d)",
+ qh, scratch & 0x007f,
+ speed_char(scratch),
+ (scratch >> 8) & 0x000f,
+ scratch, hc32_to_cpup(fotg210, &hw->hw_info2),
+ hc32_to_cpup(fotg210, &hw->hw_token), mark,
+ (cpu_to_hc32(fotg210, QTD_TOGGLE) & hw->hw_token)
+ ? "data1" : "data0",
+ (hc32_to_cpup(fotg210, &hw->hw_alt_next) >> 1) & 0x0f);
+ size -= temp;
+ next += temp;
+
+ /* hc may be modifying the list as we read it ... */
+ list_for_each_entry(td, &qh->qtd_list, qtd_list) {
+ scratch = hc32_to_cpup(fotg210, &td->hw_token);
+ mark = ' ';
+ if (hw_curr == td->qtd_dma)
+ mark = '*';
+ else if (hw->hw_qtd_next == cpu_to_hc32(fotg210, td->qtd_dma))
+ mark = '+';
+ else if (QTD_LENGTH(scratch)) {
+ if (td->hw_alt_next == fotg210->async->hw->hw_alt_next)
+ mark = '#';
+ else if (td->hw_alt_next != list_end)
+ mark = '/';
+ }
+ temp = snprintf(next, size,
+ "\n\t%p%c%s len=%d %08x urb %p",
+ td, mark, ({ char *tmp;
+ switch ((scratch>>8)&0x03) {
+ case 0:
+ tmp = "out";
+ break;
+ case 1:
+ tmp = "in";
+ break;
+ case 2:
+ tmp = "setup";
+ break;
+ default:
+ tmp = "?";
+ break;
+ } tmp; }),
+ (scratch >> 16) & 0x7fff,
+ scratch,
+ td->urb);
+ if (size < temp)
+ temp = size;
+ size -= temp;
+ next += temp;
+ if (temp == size)
+ goto done;
+ }
+
+ temp = snprintf(next, size, "\n");
+ if (size < temp)
+ temp = size;
+ size -= temp;
+ next += temp;
+
+done:
+ *sizep = size;
+ *nextp = next;
+}
+
+static ssize_t fill_async_buffer(struct debug_buffer *buf)
+{
+ struct usb_hcd *hcd;
+ struct fotg210_hcd *fotg210;
+ unsigned long flags;
+ unsigned temp, size;
+ char *next;
+ struct fotg210_qh *qh;
+
+ hcd = bus_to_hcd(buf->bus);
+ fotg210 = hcd_to_fotg210(hcd);
+ next = buf->output_buf;
+ size = buf->alloc_size;
+
+ *next = 0;
+
+ /* dumps a snapshot of the async schedule.
+ * usually empty except for long-term bulk reads, or head.
+ * one QH per line, and TDs we know about
+ */
+ spin_lock_irqsave(&fotg210->lock, flags);
+ for (qh = fotg210->async->qh_next.qh; size > 0 && qh;
+ qh = qh->qh_next.qh)
+ qh_lines(fotg210, qh, &next, &size);
+ if (fotg210->async_unlink && size > 0) {
+ temp = scnprintf(next, size, "\nunlink =\n");
+ size -= temp;
+ next += temp;
+
+ for (qh = fotg210->async_unlink; size > 0 && qh;
+ qh = qh->unlink_next)
+ qh_lines(fotg210, qh, &next, &size);
+ }
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+
+ return strlen(buf->output_buf);
+}
+
+#define DBG_SCHED_LIMIT 64
+static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
+{
+ struct usb_hcd *hcd;
+ struct fotg210_hcd *fotg210;
+ unsigned long flags;
+ union fotg210_shadow p, *seen;
+ unsigned temp, size, seen_count;
+ char *next;
+ unsigned i;
+ __hc32 tag;
+
+ seen = kmalloc(DBG_SCHED_LIMIT * sizeof(*seen), GFP_ATOMIC);
+ if (!seen)
+ return 0;
+ seen_count = 0;
+
+ hcd = bus_to_hcd(buf->bus);
+ fotg210 = hcd_to_fotg210(hcd);
+ next = buf->output_buf;
+ size = buf->alloc_size;
+
+ temp = scnprintf(next, size, "size = %d\n", fotg210->periodic_size);
+ size -= temp;
+ next += temp;
+
+ /* dump a snapshot of the periodic schedule.
+ * iso changes, interrupt usually doesn't.
+ */
+ spin_lock_irqsave(&fotg210->lock, flags);
+ for (i = 0; i < fotg210->periodic_size; i++) {
+ p = fotg210->pshadow[i];
+ if (likely(!p.ptr))
+ continue;
+ tag = Q_NEXT_TYPE(fotg210, fotg210->periodic[i]);
+
+ temp = scnprintf(next, size, "%4d: ", i);
+ size -= temp;
+ next += temp;
+
+ do {
+ struct fotg210_qh_hw *hw;
+
+ switch (hc32_to_cpu(fotg210, tag)) {
+ case Q_TYPE_QH:
+ hw = p.qh->hw;
+ temp = scnprintf(next, size, " qh%d-%04x/%p",
+ p.qh->period,
+ hc32_to_cpup(fotg210,
+ &hw->hw_info2)
+ /* uframe masks */
+ & (QH_CMASK | QH_SMASK),
+ p.qh);
+ size -= temp;
+ next += temp;
+ /* don't repeat what follows this qh */
+ for (temp = 0; temp < seen_count; temp++) {
+ if (seen[temp].ptr != p.ptr)
+ continue;
+ if (p.qh->qh_next.ptr) {
+ temp = scnprintf(next, size,
+ " ...");
+ size -= temp;
+ next += temp;
+ }
+ break;
+ }
+ /* show more info the first time around */
+ if (temp == seen_count) {
+ u32 scratch = hc32_to_cpup(fotg210,
+ &hw->hw_info1);
+ struct fotg210_qtd *qtd;
+ char *type = "";
+
+ /* count tds, get ep direction */
+ temp = 0;
+ list_for_each_entry(qtd,
+ &p.qh->qtd_list,
+ qtd_list) {
+ temp++;
+ switch (0x03 & (hc32_to_cpu(
+ fotg210,
+ qtd->hw_token) >> 8)) {
+ case 0:
+ type = "out";
+ continue;
+ case 1:
+ type = "in";
+ continue;
+ }
+ }
+
+ temp = scnprintf(next, size,
+ "(%c%d ep%d%s "
+ "[%d/%d] q%d p%d)",
+ speed_char(scratch),
+ scratch & 0x007f,
+ (scratch >> 8) & 0x000f, type,
+ p.qh->usecs, p.qh->c_usecs,
+ temp,
+ 0x7ff & (scratch >> 16));
+
+ if (seen_count < DBG_SCHED_LIMIT)
+ seen[seen_count++].qh = p.qh;
+ } else
+ temp = 0;
+ tag = Q_NEXT_TYPE(fotg210, hw->hw_next);
+ p = p.qh->qh_next;
+ break;
+ case Q_TYPE_FSTN:
+ temp = scnprintf(next, size,
+ " fstn-%8x/%p", p.fstn->hw_prev,
+ p.fstn);
+ tag = Q_NEXT_TYPE(fotg210, p.fstn->hw_next);
+ p = p.fstn->fstn_next;
+ break;
+ case Q_TYPE_ITD:
+ temp = scnprintf(next, size,
+ " itd/%p", p.itd);
+ tag = Q_NEXT_TYPE(fotg210, p.itd->hw_next);
+ p = p.itd->itd_next;
+ break;
+ }
+ size -= temp;
+ next += temp;
+ } while (p.ptr);
+
+ temp = scnprintf(next, size, "\n");
+ size -= temp;
+ next += temp;
+ }
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ kfree(seen);
+
+ return buf->alloc_size - size;
+}
+#undef DBG_SCHED_LIMIT
+
+static const char *rh_state_string(struct fotg210_hcd *fotg210)
+{
+ switch (fotg210->rh_state) {
+ case FOTG210_RH_HALTED:
+ return "halted";
+ case FOTG210_RH_SUSPENDED:
+ return "suspended";
+ case FOTG210_RH_RUNNING:
+ return "running";
+ case FOTG210_RH_STOPPING:
+ return "stopping";
+ }
+ return "?";
+}
+
+static ssize_t fill_registers_buffer(struct debug_buffer *buf)
+{
+ struct usb_hcd *hcd;
+ struct fotg210_hcd *fotg210;
+ unsigned long flags;
+ unsigned temp, size, i;
+ char *next, scratch[80];
+ static const char fmt[] = "%*s\n";
+ static const char label[] = "";
+
+ hcd = bus_to_hcd(buf->bus);
+ fotg210 = hcd_to_fotg210(hcd);
+ next = buf->output_buf;
+ size = buf->alloc_size;
+
+ spin_lock_irqsave(&fotg210->lock, flags);
+
+ if (!HCD_HW_ACCESSIBLE(hcd)) {
+ size = scnprintf(next, size,
+ "bus %s, device %s\n"
+ "%s\n"
+ "SUSPENDED(no register access)\n",
+ hcd->self.controller->bus->name,
+ dev_name(hcd->self.controller),
+ hcd->product_desc);
+ goto done;
+ }
+
+ /* Capability Registers */
+ i = HC_VERSION(fotg210, fotg210_readl(fotg210,
+ &fotg210->caps->hc_capbase));
+ temp = scnprintf(next, size,
+ "bus %s, device %s\n"
+ "%s\n"
+ "EHCI %x.%02x, rh state %s\n",
+ hcd->self.controller->bus->name,
+ dev_name(hcd->self.controller),
+ hcd->product_desc,
+ i >> 8, i & 0x0ff, rh_state_string(fotg210));
+ size -= temp;
+ next += temp;
+
+ /* FIXME interpret both types of params */
+ i = fotg210_readl(fotg210, &fotg210->caps->hcs_params);
+ temp = scnprintf(next, size, "structural params 0x%08x\n", i);
+ size -= temp;
+ next += temp;
+
+ i = fotg210_readl(fotg210, &fotg210->caps->hcc_params);
+ temp = scnprintf(next, size, "capability params 0x%08x\n", i);
+ size -= temp;
+ next += temp;
+
+ /* Operational Registers */
+ temp = dbg_status_buf(scratch, sizeof(scratch), label,
+ fotg210_readl(fotg210, &fotg210->regs->status));
+ temp = scnprintf(next, size, fmt, temp, scratch);
+ size -= temp;
+ next += temp;
+
+ temp = dbg_command_buf(scratch, sizeof(scratch), label,
+ fotg210_readl(fotg210, &fotg210->regs->command));
+ temp = scnprintf(next, size, fmt, temp, scratch);
+ size -= temp;
+ next += temp;
+
+ temp = dbg_intr_buf(scratch, sizeof(scratch), label,
+ fotg210_readl(fotg210, &fotg210->regs->intr_enable));
+ temp = scnprintf(next, size, fmt, temp, scratch);
+ size -= temp;
+ next += temp;
+
+ temp = scnprintf(next, size, "uframe %04x\n",
+ fotg210_read_frame_index(fotg210));
+ size -= temp;
+ next += temp;
+
+ if (fotg210->async_unlink) {
+ temp = scnprintf(next, size, "async unlink qh %p\n",
+ fotg210->async_unlink);
+ size -= temp;
+ next += temp;
+ }
+
+#ifdef FOTG210_STATS
+ temp = scnprintf(next, size,
+ "irq normal %ld err %ld iaa %ld(lost %ld)\n",
+ fotg210->stats.normal, fotg210->stats.error, fotg210->stats.iaa,
+ fotg210->stats.lost_iaa);
+ size -= temp;
+ next += temp;
+
+ temp = scnprintf(next, size, "complete %ld unlink %ld\n",
+ fotg210->stats.complete, fotg210->stats.unlink);
+ size -= temp;
+ next += temp;
+#endif
+
+done:
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+
+ return buf->alloc_size - size;
+}
+
+static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
+ ssize_t (*fill_func)(struct debug_buffer *))
+{
+ struct debug_buffer *buf;
+
+ buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
+
+ if (buf) {
+ buf->bus = bus;
+ buf->fill_func = fill_func;
+ mutex_init(&buf->mutex);
+ buf->alloc_size = PAGE_SIZE;
+ }
+
+ return buf;
+}
+
+static int fill_buffer(struct debug_buffer *buf)
+{
+ int ret = 0;
+
+ if (!buf->output_buf)
+ buf->output_buf = vmalloc(buf->alloc_size);
+
+ if (!buf->output_buf) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = buf->fill_func(buf);
+
+ if (ret >= 0) {
+ buf->count = ret;
+ ret = 0;
+ }
+
+out:
+ return ret;
+}
+
+static ssize_t debug_output(struct file *file, char __user *user_buf,
+ size_t len, loff_t *offset)
+{
+ struct debug_buffer *buf = file->private_data;
+ int ret = 0;
+
+ mutex_lock(&buf->mutex);
+ if (buf->count == 0) {
+ ret = fill_buffer(buf);
+ if (ret != 0) {
+ mutex_unlock(&buf->mutex);
+ goto out;
+ }
+ }
+ mutex_unlock(&buf->mutex);
+
+ ret = simple_read_from_buffer(user_buf, len, offset,
+ buf->output_buf, buf->count);
+
+out:
+ return ret;
+
+}
+
+static int debug_close(struct inode *inode, struct file *file)
+{
+ struct debug_buffer *buf = file->private_data;
+
+ if (buf) {
+ vfree(buf->output_buf);
+ kfree(buf);
+ }
+
+ return 0;
+}
+static int debug_async_open(struct inode *inode, struct file *file)
+{
+ file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
+
+ return file->private_data ? 0 : -ENOMEM;
+}
+
+static int debug_periodic_open(struct inode *inode, struct file *file)
+{
+ struct debug_buffer *buf;
+ buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
+ if (!buf)
+ return -ENOMEM;
+
+ buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
+ file->private_data = buf;
+ return 0;
+}
+
+static int debug_registers_open(struct inode *inode, struct file *file)
+{
+ file->private_data = alloc_buffer(inode->i_private,
+ fill_registers_buffer);
+
+ return file->private_data ? 0 : -ENOMEM;
+}
+
+static inline void create_debug_files(struct fotg210_hcd *fotg210)
+{
+ struct usb_bus *bus = &fotg210_to_hcd(fotg210)->self;
+
+ fotg210->debug_dir = debugfs_create_dir(bus->bus_name,
+ fotg210_debug_root);
+ if (!fotg210->debug_dir)
+ return;
+
+ if (!debugfs_create_file("async", S_IRUGO, fotg210->debug_dir, bus,
+ &debug_async_fops))
+ goto file_error;
+
+ if (!debugfs_create_file("periodic", S_IRUGO, fotg210->debug_dir, bus,
+ &debug_periodic_fops))
+ goto file_error;
+
+ if (!debugfs_create_file("registers", S_IRUGO, fotg210->debug_dir, bus,
+ &debug_registers_fops))
+ goto file_error;
+
+ return;
+
+file_error:
+ debugfs_remove_recursive(fotg210->debug_dir);
+}
+
+static inline void remove_debug_files(struct fotg210_hcd *fotg210)
+{
+ debugfs_remove_recursive(fotg210->debug_dir);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * handshake - spin reading hc until handshake completes or fails
+ * @ptr: address of hc register to be read
+ * @mask: bits to look at in result of read
+ * @done: value of those bits when handshake succeeds
+ * @usec: timeout in microseconds
+ *
+ * Returns negative errno, or zero on success
+ *
+ * Success happens when the "mask" bits have the specified value (hardware
+ * handshake done). There are two failure modes: "usec" have passed (major
+ * hardware flakeout), or the register reads as all-ones (hardware removed).
+ *
+ * That last failure should_only happen in cases like physical cardbus eject
+ * before driver shutdown. But it also seems to be caused by bugs in cardbus
+ * bridge shutdown: shutting down the bridge before the devices using it.
+ */
+static int handshake(struct fotg210_hcd *fotg210, void __iomem *ptr,
+ u32 mask, u32 done, int usec)
+{
+ u32 result;
+
+ do {
+ result = fotg210_readl(fotg210, ptr);
+ if (result == ~(u32)0) /* card removed */
+ return -ENODEV;
+ result &= mask;
+ if (result == done)
+ return 0;
+ udelay(1);
+ usec--;
+ } while (usec > 0);
+ return -ETIMEDOUT;
+}
+
+/*
+ * Force HC to halt state from unknown (EHCI spec section 2.3).
+ * Must be called with interrupts enabled and the lock not held.
+ */
+static int fotg210_halt(struct fotg210_hcd *fotg210)
+{
+ u32 temp;
+
+ spin_lock_irq(&fotg210->lock);
+
+ /* disable any irqs left enabled by previous code */
+ fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable);
+
+ /*
+ * This routine gets called during probe before fotg210->command
+ * has been initialized, so we can't rely on its value.
+ */
+ fotg210->command &= ~CMD_RUN;
+ temp = fotg210_readl(fotg210, &fotg210->regs->command);
+ temp &= ~(CMD_RUN | CMD_IAAD);
+ fotg210_writel(fotg210, temp, &fotg210->regs->command);
+
+ spin_unlock_irq(&fotg210->lock);
+ synchronize_irq(fotg210_to_hcd(fotg210)->irq);
+
+ return handshake(fotg210, &fotg210->regs->status,
+ STS_HALT, STS_HALT, 16 * 125);
+}
+
+/*
+ * Reset a non-running (STS_HALT == 1) controller.
+ * Must be called with interrupts enabled and the lock not held.
+ */
+static int fotg210_reset(struct fotg210_hcd *fotg210)
+{
+ int retval;
+ u32 command = fotg210_readl(fotg210, &fotg210->regs->command);
+
+ /* If the EHCI debug controller is active, special care must be
+ * taken before and after a host controller reset */
+ if (fotg210->debug && !dbgp_reset_prep(fotg210_to_hcd(fotg210)))
+ fotg210->debug = NULL;
+
+ command |= CMD_RESET;
+ dbg_cmd(fotg210, "reset", command);
+ fotg210_writel(fotg210, command, &fotg210->regs->command);
+ fotg210->rh_state = FOTG210_RH_HALTED;
+ fotg210->next_statechange = jiffies;
+ retval = handshake(fotg210, &fotg210->regs->command,
+ CMD_RESET, 0, 250 * 1000);
+
+ if (retval)
+ return retval;
+
+ if (fotg210->debug)
+ dbgp_external_startup(fotg210_to_hcd(fotg210));
+
+ fotg210->port_c_suspend = fotg210->suspended_ports =
+ fotg210->resuming_ports = 0;
+ return retval;
+}
+
+/*
+ * Idle the controller (turn off the schedules).
+ * Must be called with interrupts enabled and the lock not held.
+ */
+static void fotg210_quiesce(struct fotg210_hcd *fotg210)
+{
+ u32 temp;
+
+ if (fotg210->rh_state != FOTG210_RH_RUNNING)
+ return;
+
+ /* wait for any schedule enables/disables to take effect */
+ temp = (fotg210->command << 10) & (STS_ASS | STS_PSS);
+ handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, temp,
+ 16 * 125);
+
+ /* then disable anything that's still active */
+ spin_lock_irq(&fotg210->lock);
+ fotg210->command &= ~(CMD_ASE | CMD_PSE);
+ fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
+ spin_unlock_irq(&fotg210->lock);
+
+ /* hardware can take 16 microframes to turn off ... */
+ handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, 0,
+ 16 * 125);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void end_unlink_async(struct fotg210_hcd *fotg210);
+static void unlink_empty_async(struct fotg210_hcd *fotg210);
+static void fotg210_work(struct fotg210_hcd *fotg210);
+static void start_unlink_intr(struct fotg210_hcd *fotg210,
+ struct fotg210_qh *qh);
+static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh);
+
+/*-------------------------------------------------------------------------*/
+
+/* Set a bit in the USBCMD register */
+static void fotg210_set_command_bit(struct fotg210_hcd *fotg210, u32 bit)
+{
+ fotg210->command |= bit;
+ fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
+
+ /* unblock posted write */
+ fotg210_readl(fotg210, &fotg210->regs->command);
+}
+
+/* Clear a bit in the USBCMD register */
+static void fotg210_clear_command_bit(struct fotg210_hcd *fotg210, u32 bit)
+{
+ fotg210->command &= ~bit;
+ fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
+
+ /* unblock posted write */
+ fotg210_readl(fotg210, &fotg210->regs->command);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * EHCI timer support... Now using hrtimers.
+ *
+ * Lots of different events are triggered from fotg210->hrtimer. Whenever
+ * the timer routine runs, it checks each possible event; events that are
+ * currently enabled and whose expiration time has passed get handled.
+ * The set of enabled events is stored as a collection of bitflags in
+ * fotg210->enabled_hrtimer_events, and they are numbered in order of
+ * increasing delay values (ranging between 1 ms and 100 ms).
+ *
+ * Rather than implementing a sorted list or tree of all pending events,
+ * we keep track only of the lowest-numbered pending event, in
+ * fotg210->next_hrtimer_event. Whenever fotg210->hrtimer gets restarted, its
+ * expiration time is set to the timeout value for this event.
+ *
+ * As a result, events might not get handled right away; the actual delay
+ * could be anywhere up to twice the requested delay. This doesn't
+ * matter, because none of the events are especially time-critical. The
+ * ones that matter most all have a delay of 1 ms, so they will be
+ * handled after 2 ms at most, which is okay. In addition to this, we
+ * allow for an expiration range of 1 ms.
+ */
+
+/*
+ * Delay lengths for the hrtimer event types.
+ * Keep this list sorted by delay length, in the same order as
+ * the event types indexed by enum fotg210_hrtimer_event in fotg210.h.
+ */
+static unsigned event_delays_ns[] = {
+ 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_ASS */
+ 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_PSS */
+ 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_DEAD */
+ 1125 * NSEC_PER_USEC, /* FOTG210_HRTIMER_UNLINK_INTR */
+ 2 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_FREE_ITDS */
+ 6 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_ASYNC_UNLINKS */
+ 10 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_IAA_WATCHDOG */
+ 10 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_DISABLE_PERIODIC */
+ 15 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_DISABLE_ASYNC */
+ 100 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_IO_WATCHDOG */
+};
+
+/* Enable a pending hrtimer event */
+static void fotg210_enable_event(struct fotg210_hcd *fotg210, unsigned event,
+ bool resched)
+{
+ ktime_t *timeout = &fotg210->hr_timeouts[event];
+
+ if (resched)
+ *timeout = ktime_add(ktime_get(),
+ ktime_set(0, event_delays_ns[event]));
+ fotg210->enabled_hrtimer_events |= (1 << event);
+
+ /* Track only the lowest-numbered pending event */
+ if (event < fotg210->next_hrtimer_event) {
+ fotg210->next_hrtimer_event = event;
+ hrtimer_start_range_ns(&fotg210->hrtimer, *timeout,
+ NSEC_PER_MSEC, HRTIMER_MODE_ABS);
+ }
+}
+
+
+/* Poll the STS_ASS status bit; see when it agrees with CMD_ASE */
+static void fotg210_poll_ASS(struct fotg210_hcd *fotg210)
+{
+ unsigned actual, want;
+
+ /* Don't enable anything if the controller isn't running (e.g., died) */
+ if (fotg210->rh_state != FOTG210_RH_RUNNING)
+ return;
+
+ want = (fotg210->command & CMD_ASE) ? STS_ASS : 0;
+ actual = fotg210_readl(fotg210, &fotg210->regs->status) & STS_ASS;
+
+ if (want != actual) {
+
+ /* Poll again later, but give up after about 20 ms */
+ if (fotg210->ASS_poll_count++ < 20) {
+ fotg210_enable_event(fotg210, FOTG210_HRTIMER_POLL_ASS,
+ true);
+ return;
+ }
+ fotg210_dbg(fotg210, "Waited too long for the async schedule status (%x/%x), giving up\n",
+ want, actual);
+ }
+ fotg210->ASS_poll_count = 0;
+
+ /* The status is up-to-date; restart or stop the schedule as needed */
+ if (want == 0) { /* Stopped */
+ if (fotg210->async_count > 0)
+ fotg210_set_command_bit(fotg210, CMD_ASE);
+
+ } else { /* Running */
+ if (fotg210->async_count == 0) {
+
+ /* Turn off the schedule after a while */
+ fotg210_enable_event(fotg210,
+ FOTG210_HRTIMER_DISABLE_ASYNC,
+ true);
+ }
+ }
+}
+
+/* Turn off the async schedule after a brief delay */
+static void fotg210_disable_ASE(struct fotg210_hcd *fotg210)
+{
+ fotg210_clear_command_bit(fotg210, CMD_ASE);
+}
+
+
+/* Poll the STS_PSS status bit; see when it agrees with CMD_PSE */
+static void fotg210_poll_PSS(struct fotg210_hcd *fotg210)
+{
+ unsigned actual, want;
+
+ /* Don't do anything if the controller isn't running (e.g., died) */
+ if (fotg210->rh_state != FOTG210_RH_RUNNING)
+ return;
+
+ want = (fotg210->command & CMD_PSE) ? STS_PSS : 0;
+ actual = fotg210_readl(fotg210, &fotg210->regs->status) & STS_PSS;
+
+ if (want != actual) {
+
+ /* Poll again later, but give up after about 20 ms */
+ if (fotg210->PSS_poll_count++ < 20) {
+ fotg210_enable_event(fotg210, FOTG210_HRTIMER_POLL_PSS,
+ true);
+ return;
+ }
+ fotg210_dbg(fotg210, "Waited too long for the periodic schedule status (%x/%x), giving up\n",
+ want, actual);
+ }
+ fotg210->PSS_poll_count = 0;
+
+ /* The status is up-to-date; restart or stop the schedule as needed */
+ if (want == 0) { /* Stopped */
+ if (fotg210->periodic_count > 0)
+ fotg210_set_command_bit(fotg210, CMD_PSE);
+
+ } else { /* Running */
+ if (fotg210->periodic_count == 0) {
+
+ /* Turn off the schedule after a while */
+ fotg210_enable_event(fotg210,
+ FOTG210_HRTIMER_DISABLE_PERIODIC,
+ true);
+ }
+ }
+}
+
+/* Turn off the periodic schedule after a brief delay */
+static void fotg210_disable_PSE(struct fotg210_hcd *fotg210)
+{
+ fotg210_clear_command_bit(fotg210, CMD_PSE);
+}
+
+
+/* Poll the STS_HALT status bit; see when a dead controller stops */
+static void fotg210_handle_controller_death(struct fotg210_hcd *fotg210)
+{
+ if (!(fotg210_readl(fotg210, &fotg210->regs->status) & STS_HALT)) {
+
+ /* Give up after a few milliseconds */
+ if (fotg210->died_poll_count++ < 5) {
+ /* Try again later */
+ fotg210_enable_event(fotg210,
+ FOTG210_HRTIMER_POLL_DEAD, true);
+ return;
+ }
+ fotg210_warn(fotg210, "Waited too long for the controller to stop, giving up\n");
+ }
+
+ /* Clean up the mess */
+ fotg210->rh_state = FOTG210_RH_HALTED;
+ fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable);
+ fotg210_work(fotg210);
+ end_unlink_async(fotg210);
+
+ /* Not in process context, so don't try to reset the controller */
+}
+
+
+/* Handle unlinked interrupt QHs once they are gone from the hardware */
+static void fotg210_handle_intr_unlinks(struct fotg210_hcd *fotg210)
+{
+ bool stopped = (fotg210->rh_state < FOTG210_RH_RUNNING);
+
+ /*
+ * Process all the QHs on the intr_unlink list that were added
+ * before the current unlink cycle began. The list is in
+ * temporal order, so stop when we reach the first entry in the
+ * current cycle. But if the root hub isn't running then
+ * process all the QHs on the list.
+ */
+ fotg210->intr_unlinking = true;
+ while (fotg210->intr_unlink) {
+ struct fotg210_qh *qh = fotg210->intr_unlink;
+
+ if (!stopped && qh->unlink_cycle == fotg210->intr_unlink_cycle)
+ break;
+ fotg210->intr_unlink = qh->unlink_next;
+ qh->unlink_next = NULL;
+ end_unlink_intr(fotg210, qh);
+ }
+
+ /* Handle remaining entries later */
+ if (fotg210->intr_unlink) {
+ fotg210_enable_event(fotg210, FOTG210_HRTIMER_UNLINK_INTR,
+ true);
+ ++fotg210->intr_unlink_cycle;
+ }
+ fotg210->intr_unlinking = false;
+}
+
+
+/* Start another free-iTDs/siTDs cycle */
+static void start_free_itds(struct fotg210_hcd *fotg210)
+{
+ if (!(fotg210->enabled_hrtimer_events &
+ BIT(FOTG210_HRTIMER_FREE_ITDS))) {
+ fotg210->last_itd_to_free = list_entry(
+ fotg210->cached_itd_list.prev,
+ struct fotg210_itd, itd_list);
+ fotg210_enable_event(fotg210, FOTG210_HRTIMER_FREE_ITDS, true);
+ }
+}
+
+/* Wait for controller to stop using old iTDs and siTDs */
+static void end_free_itds(struct fotg210_hcd *fotg210)
+{
+ struct fotg210_itd *itd, *n;
+
+ if (fotg210->rh_state < FOTG210_RH_RUNNING)
+ fotg210->last_itd_to_free = NULL;
+
+ list_for_each_entry_safe(itd, n, &fotg210->cached_itd_list, itd_list) {
+ list_del(&itd->itd_list);
+ dma_pool_free(fotg210->itd_pool, itd, itd->itd_dma);
+ if (itd == fotg210->last_itd_to_free)
+ break;
+ }
+
+ if (!list_empty(&fotg210->cached_itd_list))
+ start_free_itds(fotg210);
+}
+
+
+/* Handle lost (or very late) IAA interrupts */
+static void fotg210_iaa_watchdog(struct fotg210_hcd *fotg210)
+{
+ if (fotg210->rh_state != FOTG210_RH_RUNNING)
+ return;
+
+ /*
+ * Lost IAA irqs wedge things badly; seen first with a vt8235.
+ * So we need this watchdog, but must protect it against both
+ * (a) SMP races against real IAA firing and retriggering, and
+ * (b) clean HC shutdown, when IAA watchdog was pending.
+ */
+ if (fotg210->async_iaa) {
+ u32 cmd, status;
+
+ /* If we get here, IAA is *REALLY* late. It's barely
+ * conceivable that the system is so busy that CMD_IAAD
+ * is still legitimately set, so let's be sure it's
+ * clear before we read STS_IAA. (The HC should clear
+ * CMD_IAAD when it sets STS_IAA.)
+ */
+ cmd = fotg210_readl(fotg210, &fotg210->regs->command);
+
+ /*
+ * If IAA is set here it either legitimately triggered
+ * after the watchdog timer expired (_way_ late, so we'll
+ * still count it as lost) ... or a silicon erratum:
+ * - VIA seems to set IAA without triggering the IRQ;
+ * - IAAD potentially cleared without setting IAA.
+ */
+ status = fotg210_readl(fotg210, &fotg210->regs->status);
+ if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
+ COUNT(fotg210->stats.lost_iaa);
+ fotg210_writel(fotg210, STS_IAA,
+ &fotg210->regs->status);
+ }
+
+ fotg210_dbg(fotg210, "IAA watchdog: status %x cmd %x\n",
+ status, cmd);
+ end_unlink_async(fotg210);
+ }
+}
+
+
+/* Enable the I/O watchdog, if appropriate */
+static void turn_on_io_watchdog(struct fotg210_hcd *fotg210)
+{
+ /* Not needed if the controller isn't running or it's already enabled */
+ if (fotg210->rh_state != FOTG210_RH_RUNNING ||
+ (fotg210->enabled_hrtimer_events &
+ BIT(FOTG210_HRTIMER_IO_WATCHDOG)))
+ return;
+
+ /*
+ * Isochronous transfers always need the watchdog.
+ * For other sorts we use it only if the flag is set.
+ */
+ if (fotg210->isoc_count > 0 || (fotg210->need_io_watchdog &&
+ fotg210->async_count + fotg210->intr_count > 0))
+ fotg210_enable_event(fotg210, FOTG210_HRTIMER_IO_WATCHDOG,
+ true);
+}
+
+
+/*
+ * Handler functions for the hrtimer event types.
+ * Keep this array in the same order as the event types indexed by
+ * enum fotg210_hrtimer_event in fotg210.h.
+ */
+static void (*event_handlers[])(struct fotg210_hcd *) = {
+ fotg210_poll_ASS, /* FOTG210_HRTIMER_POLL_ASS */
+ fotg210_poll_PSS, /* FOTG210_HRTIMER_POLL_PSS */
+ fotg210_handle_controller_death, /* FOTG210_HRTIMER_POLL_DEAD */
+ fotg210_handle_intr_unlinks, /* FOTG210_HRTIMER_UNLINK_INTR */
+ end_free_itds, /* FOTG210_HRTIMER_FREE_ITDS */
+ unlink_empty_async, /* FOTG210_HRTIMER_ASYNC_UNLINKS */
+ fotg210_iaa_watchdog, /* FOTG210_HRTIMER_IAA_WATCHDOG */
+ fotg210_disable_PSE, /* FOTG210_HRTIMER_DISABLE_PERIODIC */
+ fotg210_disable_ASE, /* FOTG210_HRTIMER_DISABLE_ASYNC */
+ fotg210_work, /* FOTG210_HRTIMER_IO_WATCHDOG */
+};
+
+static enum hrtimer_restart fotg210_hrtimer_func(struct hrtimer *t)
+{
+ struct fotg210_hcd *fotg210 =
+ container_of(t, struct fotg210_hcd, hrtimer);
+ ktime_t now;
+ unsigned long events;
+ unsigned long flags;
+ unsigned e;
+
+ spin_lock_irqsave(&fotg210->lock, flags);
+
+ events = fotg210->enabled_hrtimer_events;
+ fotg210->enabled_hrtimer_events = 0;
+ fotg210->next_hrtimer_event = FOTG210_HRTIMER_NO_EVENT;
+
+ /*
+ * Check each pending event. If its time has expired, handle
+ * the event; otherwise re-enable it.
+ */
+ now = ktime_get();
+ for_each_set_bit(e, &events, FOTG210_HRTIMER_NUM_EVENTS) {
+ if (now.tv64 >= fotg210->hr_timeouts[e].tv64)
+ event_handlers[e](fotg210);
+ else
+ fotg210_enable_event(fotg210, e, false);
+ }
+
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ return HRTIMER_NORESTART;
+}
+
+/*-------------------------------------------------------------------------*/
+
+#define fotg210_bus_suspend NULL
+#define fotg210_bus_resume NULL
+
+/*-------------------------------------------------------------------------*/
+
+static int check_reset_complete(
+ struct fotg210_hcd *fotg210,
+ int index,
+ u32 __iomem *status_reg,
+ int port_status
+) {
+ if (!(port_status & PORT_CONNECT))
+ return port_status;
+
+ /* if reset finished and it's still not enabled -- handoff */
+ if (!(port_status & PORT_PE)) {
+ /* with integrated TT, there's nobody to hand it to! */
+ fotg210_dbg(fotg210,
+ "Failed to enable port %d on root hub TT\n",
+ index+1);
+ return port_status;
+ } else {
+ fotg210_dbg(fotg210, "port %d reset complete, port enabled\n",
+ index + 1);
+ }
+
+ return port_status;
+}
+
+/*-------------------------------------------------------------------------*/
+
+
+/* build "status change" packet (one or two bytes) from HC registers */
+
+static int
+fotg210_hub_status_data(struct usb_hcd *hcd, char *buf)
+{
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+ u32 temp, status;
+ u32 mask;
+ int retval = 1;
+ unsigned long flags;
+
+ /* init status to no-changes */
+ buf[0] = 0;
+
+ /* Inform the core about resumes-in-progress by returning
+ * a non-zero value even if there are no status changes.
+ */
+ status = fotg210->resuming_ports;
+
+ mask = PORT_CSC | PORT_PEC;
+ /* PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND */
+
+ /* no hub change reports (bit 0) for now (power, ...) */
+
+ /* port N changes (bit N)? */
+ spin_lock_irqsave(&fotg210->lock, flags);
+
+ temp = fotg210_readl(fotg210, &fotg210->regs->port_status);
+
+ /*
+ * Return status information even for ports with OWNER set.
+ * Otherwise hub_wq wouldn't see the disconnect event when a
+ * high-speed device is switched over to the companion
+ * controller by the user.
+ */
+
+ if ((temp & mask) != 0 || test_bit(0, &fotg210->port_c_suspend)
+ || (fotg210->reset_done[0] && time_after_eq(
+ jiffies, fotg210->reset_done[0]))) {
+ buf[0] |= 1 << 1;
+ status = STS_PCD;
+ }
+ /* FIXME autosuspend idle root hubs */
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ return status ? retval : 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void
+fotg210_hub_descriptor(
+ struct fotg210_hcd *fotg210,
+ struct usb_hub_descriptor *desc
+) {
+ int ports = HCS_N_PORTS(fotg210->hcs_params);
+ u16 temp;
+
+ desc->bDescriptorType = USB_DT_HUB;
+ desc->bPwrOn2PwrGood = 10; /* fotg210 1.0, 2.3.9 says 20ms max */
+ desc->bHubContrCurrent = 0;
+
+ desc->bNbrPorts = ports;
+ temp = 1 + (ports / 8);
+ desc->bDescLength = 7 + 2 * temp;
+
+ /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
+ memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
+ memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
+
+ temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
+ temp |= HUB_CHAR_NO_LPSM; /* no power switching */
+ desc->wHubCharacteristics = cpu_to_le16(temp);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int fotg210_hub_control(
+ struct usb_hcd *hcd,
+ u16 typeReq,
+ u16 wValue,
+ u16 wIndex,
+ char *buf,
+ u16 wLength
+) {
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+ int ports = HCS_N_PORTS(fotg210->hcs_params);
+ u32 __iomem *status_reg = &fotg210->regs->port_status;
+ u32 temp, temp1, status;
+ unsigned long flags;
+ int retval = 0;
+ unsigned selector;
+
+ /*
+ * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
+ * HCS_INDICATOR may say we can change LEDs to off/amber/green.
+ * (track current state ourselves) ... blink for diagnostics,
+ * power, "this is the one", etc. EHCI spec supports this.
+ */
+
+ spin_lock_irqsave(&fotg210->lock, flags);
+ switch (typeReq) {
+ case ClearHubFeature:
+ switch (wValue) {
+ case C_HUB_LOCAL_POWER:
+ case C_HUB_OVER_CURRENT:
+ /* no hub-wide feature/status flags */
+ break;
+ default:
+ goto error;
+ }
+ break;
+ case ClearPortFeature:
+ if (!wIndex || wIndex > ports)
+ goto error;
+ wIndex--;
+ temp = fotg210_readl(fotg210, status_reg);
+ temp &= ~PORT_RWC_BITS;
+
+ /*
+ * Even if OWNER is set, so the port is owned by the
+ * companion controller, hub_wq needs to be able to clear
+ * the port-change status bits (especially
+ * USB_PORT_STAT_C_CONNECTION).
+ */
+
+ switch (wValue) {
+ case USB_PORT_FEAT_ENABLE:
+ fotg210_writel(fotg210, temp & ~PORT_PE, status_reg);
+ break;
+ case USB_PORT_FEAT_C_ENABLE:
+ fotg210_writel(fotg210, temp | PORT_PEC, status_reg);
+ break;
+ case USB_PORT_FEAT_SUSPEND:
+ if (temp & PORT_RESET)
+ goto error;
+ if (!(temp & PORT_SUSPEND))
+ break;
+ if ((temp & PORT_PE) == 0)
+ goto error;
+
+ /* resume signaling for 20 msec */
+ fotg210_writel(fotg210, temp | PORT_RESUME, status_reg);
+ fotg210->reset_done[wIndex] = jiffies
+ + msecs_to_jiffies(USB_RESUME_TIMEOUT);
+ break;
+ case USB_PORT_FEAT_C_SUSPEND:
+ clear_bit(wIndex, &fotg210->port_c_suspend);
+ break;
+ case USB_PORT_FEAT_C_CONNECTION:
+ fotg210_writel(fotg210, temp | PORT_CSC, status_reg);
+ break;
+ case USB_PORT_FEAT_C_OVER_CURRENT:
+ fotg210_writel(fotg210, temp | OTGISR_OVC,
+ &fotg210->regs->otgisr);
+ break;
+ case USB_PORT_FEAT_C_RESET:
+ /* GetPortStatus clears reset */
+ break;
+ default:
+ goto error;
+ }
+ fotg210_readl(fotg210, &fotg210->regs->command);
+ break;
+ case GetHubDescriptor:
+ fotg210_hub_descriptor(fotg210, (struct usb_hub_descriptor *)
+ buf);
+ break;
+ case GetHubStatus:
+ /* no hub-wide feature/status flags */
+ memset(buf, 0, 4);
+ /*cpu_to_le32s ((u32 *) buf); */
+ break;
+ case GetPortStatus:
+ if (!wIndex || wIndex > ports)
+ goto error;
+ wIndex--;
+ status = 0;
+ temp = fotg210_readl(fotg210, status_reg);
+
+ /* wPortChange bits */
+ if (temp & PORT_CSC)
+ status |= USB_PORT_STAT_C_CONNECTION << 16;
+ if (temp & PORT_PEC)
+ status |= USB_PORT_STAT_C_ENABLE << 16;
+
+ temp1 = fotg210_readl(fotg210, &fotg210->regs->otgisr);
+ if (temp1 & OTGISR_OVC)
+ status |= USB_PORT_STAT_C_OVERCURRENT << 16;
+
+ /* whoever resumes must GetPortStatus to complete it!! */
+ if (temp & PORT_RESUME) {
+
+ /* Remote Wakeup received? */
+ if (!fotg210->reset_done[wIndex]) {
+ /* resume signaling for 20 msec */
+ fotg210->reset_done[wIndex] = jiffies
+ + msecs_to_jiffies(20);
+ /* check the port again */
+ mod_timer(&fotg210_to_hcd(fotg210)->rh_timer,
+ fotg210->reset_done[wIndex]);
+ }
+
+ /* resume completed? */
+ else if (time_after_eq(jiffies,
+ fotg210->reset_done[wIndex])) {
+ clear_bit(wIndex, &fotg210->suspended_ports);
+ set_bit(wIndex, &fotg210->port_c_suspend);
+ fotg210->reset_done[wIndex] = 0;
+
+ /* stop resume signaling */
+ temp = fotg210_readl(fotg210, status_reg);
+ fotg210_writel(fotg210,
+ temp & ~(PORT_RWC_BITS | PORT_RESUME),
+ status_reg);
+ clear_bit(wIndex, &fotg210->resuming_ports);
+ retval = handshake(fotg210, status_reg,
+ PORT_RESUME, 0, 2000 /* 2msec */);
+ if (retval != 0) {
+ fotg210_err(fotg210,
+ "port %d resume error %d\n",
+ wIndex + 1, retval);
+ goto error;
+ }
+ temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
+ }
+ }
+
+ /* whoever resets must GetPortStatus to complete it!! */
+ if ((temp & PORT_RESET)
+ && time_after_eq(jiffies,
+ fotg210->reset_done[wIndex])) {
+ status |= USB_PORT_STAT_C_RESET << 16;
+ fotg210->reset_done[wIndex] = 0;
+ clear_bit(wIndex, &fotg210->resuming_ports);
+
+ /* force reset to complete */
+ fotg210_writel(fotg210,
+ temp & ~(PORT_RWC_BITS | PORT_RESET),
+ status_reg);
+ /* REVISIT: some hardware needs 550+ usec to clear
+ * this bit; seems too long to spin routinely...
+ */
+ retval = handshake(fotg210, status_reg,
+ PORT_RESET, 0, 1000);
+ if (retval != 0) {
+ fotg210_err(fotg210, "port %d reset error %d\n",
+ wIndex + 1, retval);
+ goto error;
+ }
+
+ /* see what we found out */
+ temp = check_reset_complete(fotg210, wIndex, status_reg,
+ fotg210_readl(fotg210, status_reg));
+ }
+
+ if (!(temp & (PORT_RESUME|PORT_RESET))) {
+ fotg210->reset_done[wIndex] = 0;
+ clear_bit(wIndex, &fotg210->resuming_ports);
+ }
+
+ /* transfer dedicated ports to the companion hc */
+ if ((temp & PORT_CONNECT) &&
+ test_bit(wIndex, &fotg210->companion_ports)) {
+ temp &= ~PORT_RWC_BITS;
+ fotg210_writel(fotg210, temp, status_reg);
+ fotg210_dbg(fotg210, "port %d --> companion\n",
+ wIndex + 1);
+ temp = fotg210_readl(fotg210, status_reg);
+ }
+
+ /*
+ * Even if OWNER is set, there's no harm letting hub_wq
+ * see the wPortStatus values (they should all be 0 except
+ * for PORT_POWER anyway).
+ */
+
+ if (temp & PORT_CONNECT) {
+ status |= USB_PORT_STAT_CONNECTION;
+ status |= fotg210_port_speed(fotg210, temp);
+ }
+ if (temp & PORT_PE)
+ status |= USB_PORT_STAT_ENABLE;
+
+ /* maybe the port was unsuspended without our knowledge */
+ if (temp & (PORT_SUSPEND|PORT_RESUME)) {
+ status |= USB_PORT_STAT_SUSPEND;
+ } else if (test_bit(wIndex, &fotg210->suspended_ports)) {
+ clear_bit(wIndex, &fotg210->suspended_ports);
+ clear_bit(wIndex, &fotg210->resuming_ports);
+ fotg210->reset_done[wIndex] = 0;
+ if (temp & PORT_PE)
+ set_bit(wIndex, &fotg210->port_c_suspend);
+ }
+
+ temp1 = fotg210_readl(fotg210, &fotg210->regs->otgisr);
+ if (temp1 & OTGISR_OVC)
+ status |= USB_PORT_STAT_OVERCURRENT;
+ if (temp & PORT_RESET)
+ status |= USB_PORT_STAT_RESET;
+ if (test_bit(wIndex, &fotg210->port_c_suspend))
+ status |= USB_PORT_STAT_C_SUSPEND << 16;
+
+ if (status & ~0xffff) /* only if wPortChange is interesting */
+ dbg_port(fotg210, "GetStatus", wIndex + 1, temp);
+ put_unaligned_le32(status, buf);
+ break;
+ case SetHubFeature:
+ switch (wValue) {
+ case C_HUB_LOCAL_POWER:
+ case C_HUB_OVER_CURRENT:
+ /* no hub-wide feature/status flags */
+ break;
+ default:
+ goto error;
+ }
+ break;
+ case SetPortFeature:
+ selector = wIndex >> 8;
+ wIndex &= 0xff;
+
+ if (!wIndex || wIndex > ports)
+ goto error;
+ wIndex--;
+ temp = fotg210_readl(fotg210, status_reg);
+ temp &= ~PORT_RWC_BITS;
+ switch (wValue) {
+ case USB_PORT_FEAT_SUSPEND:
+ if ((temp & PORT_PE) == 0
+ || (temp & PORT_RESET) != 0)
+ goto error;
+
+ /* After above check the port must be connected.
+ * Set appropriate bit thus could put phy into low power
+ * mode if we have hostpc feature
+ */
+ fotg210_writel(fotg210, temp | PORT_SUSPEND,
+ status_reg);
+ set_bit(wIndex, &fotg210->suspended_ports);
+ break;
+ case USB_PORT_FEAT_RESET:
+ if (temp & PORT_RESUME)
+ goto error;
+ /* line status bits may report this as low speed,
+ * which can be fine if this root hub has a
+ * transaction translator built in.
+ */
+ fotg210_dbg(fotg210, "port %d reset\n", wIndex + 1);
+ temp |= PORT_RESET;
+ temp &= ~PORT_PE;
+
+ /*
+ * caller must wait, then call GetPortStatus
+ * usb 2.0 spec says 50 ms resets on root
+ */
+ fotg210->reset_done[wIndex] = jiffies
+ + msecs_to_jiffies(50);
+ fotg210_writel(fotg210, temp, status_reg);
+ break;
+
+ /* For downstream facing ports (these): one hub port is put
+ * into test mode according to USB2 11.24.2.13, then the hub
+ * must be reset (which for root hub now means rmmod+modprobe,
+ * or else system reboot). See EHCI 2.3.9 and 4.14 for info
+ * about the EHCI-specific stuff.
+ */
+ case USB_PORT_FEAT_TEST:
+ if (!selector || selector > 5)
+ goto error;
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ fotg210_quiesce(fotg210);
+ spin_lock_irqsave(&fotg210->lock, flags);
+
+ /* Put all enabled ports into suspend */
+ temp = fotg210_readl(fotg210, status_reg) &
+ ~PORT_RWC_BITS;
+ if (temp & PORT_PE)
+ fotg210_writel(fotg210, temp | PORT_SUSPEND,
+ status_reg);
+
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ fotg210_halt(fotg210);
+ spin_lock_irqsave(&fotg210->lock, flags);
+
+ temp = fotg210_readl(fotg210, status_reg);
+ temp |= selector << 16;
+ fotg210_writel(fotg210, temp, status_reg);
+ break;
+
+ default:
+ goto error;
+ }
+ fotg210_readl(fotg210, &fotg210->regs->command);
+ break;
+
+ default:
+error:
+ /* "stall" on error */
+ retval = -EPIPE;
+ }
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ return retval;
+}
+
+static void __maybe_unused fotg210_relinquish_port(struct usb_hcd *hcd,
+ int portnum)
+{
+ return;
+}
+
+static int __maybe_unused fotg210_port_handed_over(struct usb_hcd *hcd,
+ int portnum)
+{
+ return 0;
+}
+/*-------------------------------------------------------------------------*/
+/*
+ * There's basically three types of memory:
+ * - data used only by the HCD ... kmalloc is fine
+ * - async and periodic schedules, shared by HC and HCD ... these
+ * need to use dma_pool or dma_alloc_coherent
+ * - driver buffers, read/written by HC ... single shot DMA mapped
+ *
+ * There's also "register" data (e.g. PCI or SOC), which is memory mapped.
+ * No memory seen by this driver is pageable.
+ */
+
+/*-------------------------------------------------------------------------*/
+
+/* Allocate the key transfer structures from the previously allocated pool */
+
+static inline void fotg210_qtd_init(struct fotg210_hcd *fotg210,
+ struct fotg210_qtd *qtd, dma_addr_t dma)
+{
+ memset(qtd, 0, sizeof(*qtd));
+ qtd->qtd_dma = dma;
+ qtd->hw_token = cpu_to_hc32(fotg210, QTD_STS_HALT);
+ qtd->hw_next = FOTG210_LIST_END(fotg210);
+ qtd->hw_alt_next = FOTG210_LIST_END(fotg210);
+ INIT_LIST_HEAD(&qtd->qtd_list);
+}
+
+static struct fotg210_qtd *fotg210_qtd_alloc(struct fotg210_hcd *fotg210,
+ gfp_t flags)
+{
+ struct fotg210_qtd *qtd;
+ dma_addr_t dma;
+
+ qtd = dma_pool_alloc(fotg210->qtd_pool, flags, &dma);
+ if (qtd != NULL)
+ fotg210_qtd_init(fotg210, qtd, dma);
+
+ return qtd;
+}
+
+static inline void fotg210_qtd_free(struct fotg210_hcd *fotg210,
+ struct fotg210_qtd *qtd)
+{
+ dma_pool_free(fotg210->qtd_pool, qtd, qtd->qtd_dma);
+}
+
+
+static void qh_destroy(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
+{
+ /* clean qtds first, and know this is not linked */
+ if (!list_empty(&qh->qtd_list) || qh->qh_next.ptr) {
+ fotg210_dbg(fotg210, "unused qh not empty!\n");
+ BUG();
+ }
+ if (qh->dummy)
+ fotg210_qtd_free(fotg210, qh->dummy);
+ dma_pool_free(fotg210->qh_pool, qh->hw, qh->qh_dma);
+ kfree(qh);
+}
+
+static struct fotg210_qh *fotg210_qh_alloc(struct fotg210_hcd *fotg210,
+ gfp_t flags)
+{
+ struct fotg210_qh *qh;
+ dma_addr_t dma;
+
+ qh = kzalloc(sizeof(*qh), GFP_ATOMIC);
+ if (!qh)
+ goto done;
+ qh->hw = (struct fotg210_qh_hw *)
+ dma_pool_alloc(fotg210->qh_pool, flags, &dma);
+ if (!qh->hw)
+ goto fail;
+ memset(qh->hw, 0, sizeof(*qh->hw));
+ qh->qh_dma = dma;
+ INIT_LIST_HEAD(&qh->qtd_list);
+
+ /* dummy td enables safe urb queuing */
+ qh->dummy = fotg210_qtd_alloc(fotg210, flags);
+ if (qh->dummy == NULL) {
+ fotg210_dbg(fotg210, "no dummy td\n");
+ goto fail1;
+ }
+done:
+ return qh;
+fail1:
+ dma_pool_free(fotg210->qh_pool, qh->hw, qh->qh_dma);
+fail:
+ kfree(qh);
+ return NULL;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* The queue heads and transfer descriptors are managed from pools tied
+ * to each of the "per device" structures.
+ * This is the initialisation and cleanup code.
+ */
+
+static void fotg210_mem_cleanup(struct fotg210_hcd *fotg210)
+{
+ if (fotg210->async)
+ qh_destroy(fotg210, fotg210->async);
+ fotg210->async = NULL;
+
+ if (fotg210->dummy)
+ qh_destroy(fotg210, fotg210->dummy);
+ fotg210->dummy = NULL;
+
+ /* DMA consistent memory and pools */
+ if (fotg210->qtd_pool)
+ dma_pool_destroy(fotg210->qtd_pool);
+ fotg210->qtd_pool = NULL;
+
+ if (fotg210->qh_pool) {
+ dma_pool_destroy(fotg210->qh_pool);
+ fotg210->qh_pool = NULL;
+ }
+
+ if (fotg210->itd_pool)
+ dma_pool_destroy(fotg210->itd_pool);
+ fotg210->itd_pool = NULL;
+
+ if (fotg210->periodic)
+ dma_free_coherent(fotg210_to_hcd(fotg210)->self.controller,
+ fotg210->periodic_size * sizeof(u32),
+ fotg210->periodic, fotg210->periodic_dma);
+ fotg210->periodic = NULL;
+
+ /* shadow periodic table */
+ kfree(fotg210->pshadow);
+ fotg210->pshadow = NULL;
+}
+
+/* remember to add cleanup code (above) if you add anything here */
+static int fotg210_mem_init(struct fotg210_hcd *fotg210, gfp_t flags)
+{
+ int i;
+
+ /* QTDs for control/bulk/intr transfers */
+ fotg210->qtd_pool = dma_pool_create("fotg210_qtd",
+ fotg210_to_hcd(fotg210)->self.controller,
+ sizeof(struct fotg210_qtd),
+ 32 /* byte alignment (for hw parts) */,
+ 4096 /* can't cross 4K */);
+ if (!fotg210->qtd_pool)
+ goto fail;
+
+ /* QHs for control/bulk/intr transfers */
+ fotg210->qh_pool = dma_pool_create("fotg210_qh",
+ fotg210_to_hcd(fotg210)->self.controller,
+ sizeof(struct fotg210_qh_hw),
+ 32 /* byte alignment (for hw parts) */,
+ 4096 /* can't cross 4K */);
+ if (!fotg210->qh_pool)
+ goto fail;
+
+ fotg210->async = fotg210_qh_alloc(fotg210, flags);
+ if (!fotg210->async)
+ goto fail;
+
+ /* ITD for high speed ISO transfers */
+ fotg210->itd_pool = dma_pool_create("fotg210_itd",
+ fotg210_to_hcd(fotg210)->self.controller,
+ sizeof(struct fotg210_itd),
+ 64 /* byte alignment (for hw parts) */,
+ 4096 /* can't cross 4K */);
+ if (!fotg210->itd_pool)
+ goto fail;
+
+ /* Hardware periodic table */
+ fotg210->periodic = (__le32 *)
+ dma_alloc_coherent(fotg210_to_hcd(fotg210)->self.controller,
+ fotg210->periodic_size * sizeof(__le32),
+ &fotg210->periodic_dma, 0);
+ if (fotg210->periodic == NULL)
+ goto fail;
+
+ for (i = 0; i < fotg210->periodic_size; i++)
+ fotg210->periodic[i] = FOTG210_LIST_END(fotg210);
+
+ /* software shadow of hardware table */
+ fotg210->pshadow = kcalloc(fotg210->periodic_size, sizeof(void *),
+ flags);
+ if (fotg210->pshadow != NULL)
+ return 0;
+
+fail:
+ fotg210_dbg(fotg210, "couldn't init memory\n");
+ fotg210_mem_cleanup(fotg210);
+ return -ENOMEM;
+}
+/*-------------------------------------------------------------------------*/
+/*
+ * EHCI hardware queue manipulation ... the core. QH/QTD manipulation.
+ *
+ * Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd"
+ * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned
+ * buffers needed for the larger number). We use one QH per endpoint, queue
+ * multiple urbs (all three types) per endpoint. URBs may need several qtds.
+ *
+ * ISO traffic uses "ISO TD" (itd) records, and (along with
+ * interrupts) needs careful scheduling. Performance improvements can be
+ * an ongoing challenge. That's in "ehci-sched.c".
+ *
+ * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs,
+ * or otherwise through transaction translators (TTs) in USB 2.0 hubs using
+ * (b) special fields in qh entries or (c) split iso entries. TTs will
+ * buffer low/full speed data so the host collects it at high speed.
+ */
+
+/*-------------------------------------------------------------------------*/
+
+/* fill a qtd, returning how much of the buffer we were able to queue up */
+
+static int
+qtd_fill(struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd, dma_addr_t buf,
+ size_t len, int token, int maxpacket)
+{
+ int i, count;
+ u64 addr = buf;
+
+ /* one buffer entry per 4K ... first might be short or unaligned */
+ qtd->hw_buf[0] = cpu_to_hc32(fotg210, (u32)addr);
+ qtd->hw_buf_hi[0] = cpu_to_hc32(fotg210, (u32)(addr >> 32));
+ count = 0x1000 - (buf & 0x0fff); /* rest of that page */
+ if (likely(len < count)) /* ... iff needed */
+ count = len;
+ else {
+ buf += 0x1000;
+ buf &= ~0x0fff;
+
+ /* per-qtd limit: from 16K to 20K (best alignment) */
+ for (i = 1; count < len && i < 5; i++) {
+ addr = buf;
+ qtd->hw_buf[i] = cpu_to_hc32(fotg210, (u32)addr);
+ qtd->hw_buf_hi[i] = cpu_to_hc32(fotg210,
+ (u32)(addr >> 32));
+ buf += 0x1000;
+ if ((count + 0x1000) < len)
+ count += 0x1000;
+ else
+ count = len;
+ }
+
+ /* short packets may only terminate transfers */
+ if (count != len)
+ count -= (count % maxpacket);
+ }
+ qtd->hw_token = cpu_to_hc32(fotg210, (count << 16) | token);
+ qtd->length = count;
+
+ return count;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static inline void
+qh_update(struct fotg210_hcd *fotg210, struct fotg210_qh *qh,
+ struct fotg210_qtd *qtd)
+{
+ struct fotg210_qh_hw *hw = qh->hw;
+
+ /* writes to an active overlay are unsafe */
+ BUG_ON(qh->qh_state != QH_STATE_IDLE);
+
+ hw->hw_qtd_next = QTD_NEXT(fotg210, qtd->qtd_dma);
+ hw->hw_alt_next = FOTG210_LIST_END(fotg210);
+
+ /* Except for control endpoints, we make hardware maintain data
+ * toggle (like OHCI) ... here (re)initialize the toggle in the QH,
+ * and set the pseudo-toggle in udev. Only usb_clear_halt() will
+ * ever clear it.
+ */
+ if (!(hw->hw_info1 & cpu_to_hc32(fotg210, QH_TOGGLE_CTL))) {
+ unsigned is_out, epnum;
+
+ is_out = qh->is_out;
+ epnum = (hc32_to_cpup(fotg210, &hw->hw_info1) >> 8) & 0x0f;
+ if (unlikely(!usb_gettoggle(qh->dev, epnum, is_out))) {
+ hw->hw_token &= ~cpu_to_hc32(fotg210, QTD_TOGGLE);
+ usb_settoggle(qh->dev, epnum, is_out, 1);
+ }
+ }
+
+ hw->hw_token &= cpu_to_hc32(fotg210, QTD_TOGGLE | QTD_STS_PING);
+}
+
+/* if it weren't for a common silicon quirk (writing the dummy into the qh
+ * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
+ * recovery (including urb dequeue) would need software changes to a QH...
+ */
+static void
+qh_refresh(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
+{
+ struct fotg210_qtd *qtd;
+
+ if (list_empty(&qh->qtd_list))
+ qtd = qh->dummy;
+ else {
+ qtd = list_entry(qh->qtd_list.next,
+ struct fotg210_qtd, qtd_list);
+ /*
+ * first qtd may already be partially processed.
+ * If we come here during unlink, the QH overlay region
+ * might have reference to the just unlinked qtd. The
+ * qtd is updated in qh_completions(). Update the QH
+ * overlay here.
+ */
+ if (cpu_to_hc32(fotg210, qtd->qtd_dma) == qh->hw->hw_current) {
+ qh->hw->hw_qtd_next = qtd->hw_next;
+ qtd = NULL;
+ }
+ }
+
+ if (qtd)
+ qh_update(fotg210, qh, qtd);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void qh_link_async(struct fotg210_hcd *fotg210, struct fotg210_qh *qh);
+
+static void fotg210_clear_tt_buffer_complete(struct usb_hcd *hcd,
+ struct usb_host_endpoint *ep)
+{
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+ struct fotg210_qh *qh = ep->hcpriv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&fotg210->lock, flags);
+ qh->clearing_tt = 0;
+ if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list)
+ && fotg210->rh_state == FOTG210_RH_RUNNING)
+ qh_link_async(fotg210, qh);
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+}
+
+static void fotg210_clear_tt_buffer(struct fotg210_hcd *fotg210,
+ struct fotg210_qh *qh,
+ struct urb *urb, u32 token)
+{
+
+ /* If an async split transaction gets an error or is unlinked,
+ * the TT buffer may be left in an indeterminate state. We
+ * have to clear the TT buffer.
+ *
+ * Note: this routine is never called for Isochronous transfers.
+ */
+ if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) {
+ struct usb_device *tt = urb->dev->tt->hub;
+ dev_dbg(&tt->dev,
+ "clear tt buffer port %d, a%d ep%d t%08x\n",
+ urb->dev->ttport, urb->dev->devnum,
+ usb_pipeendpoint(urb->pipe), token);
+
+ if (urb->dev->tt->hub !=
+ fotg210_to_hcd(fotg210)->self.root_hub) {
+ if (usb_hub_clear_tt_buffer(urb) == 0)
+ qh->clearing_tt = 1;
+ }
+ }
+}
+
+static int qtd_copy_status(
+ struct fotg210_hcd *fotg210,
+ struct urb *urb,
+ size_t length,
+ u32 token
+)
+{
+ int status = -EINPROGRESS;
+
+ /* count IN/OUT bytes, not SETUP (even short packets) */
+ if (likely(QTD_PID(token) != 2))
+ urb->actual_length += length - QTD_LENGTH(token);
+
+ /* don't modify error codes */
+ if (unlikely(urb->unlinked))
+ return status;
+
+ /* force cleanup after short read; not always an error */
+ if (unlikely(IS_SHORT_READ(token)))
+ status = -EREMOTEIO;
+
+ /* serious "can't proceed" faults reported by the hardware */
+ if (token & QTD_STS_HALT) {
+ if (token & QTD_STS_BABBLE) {
+ /* FIXME "must" disable babbling device's port too */
+ status = -EOVERFLOW;
+ /* CERR nonzero + halt --> stall */
+ } else if (QTD_CERR(token)) {
+ status = -EPIPE;
+
+ /* In theory, more than one of the following bits can be set
+ * since they are sticky and the transaction is retried.
+ * Which to test first is rather arbitrary.
+ */
+ } else if (token & QTD_STS_MMF) {
+ /* fs/ls interrupt xfer missed the complete-split */
+ status = -EPROTO;
+ } else if (token & QTD_STS_DBE) {
+ status = (QTD_PID(token) == 1) /* IN ? */
+ ? -ENOSR /* hc couldn't read data */
+ : -ECOMM; /* hc couldn't write data */
+ } else if (token & QTD_STS_XACT) {
+ /* timeout, bad CRC, wrong PID, etc */
+ fotg210_dbg(fotg210, "devpath %s ep%d%s 3strikes\n",
+ urb->dev->devpath,
+ usb_pipeendpoint(urb->pipe),
+ usb_pipein(urb->pipe) ? "in" : "out");
+ status = -EPROTO;
+ } else { /* unknown */
+ status = -EPROTO;
+ }
+
+ fotg210_dbg(fotg210,
+ "dev%d ep%d%s qtd token %08x --> status %d\n",
+ usb_pipedevice(urb->pipe),
+ usb_pipeendpoint(urb->pipe),
+ usb_pipein(urb->pipe) ? "in" : "out",
+ token, status);
+ }
+
+ return status;
+}
+
+static void
+fotg210_urb_done(struct fotg210_hcd *fotg210, struct urb *urb, int status)
+__releases(fotg210->lock)
+__acquires(fotg210->lock)
+{
+ if (likely(urb->hcpriv != NULL)) {
+ struct fotg210_qh *qh = (struct fotg210_qh *) urb->hcpriv;
+
+ /* S-mask in a QH means it's an interrupt urb */
+ if ((qh->hw->hw_info2 & cpu_to_hc32(fotg210, QH_SMASK)) != 0) {
+
+ /* ... update hc-wide periodic stats (for usbfs) */
+ fotg210_to_hcd(fotg210)->self.bandwidth_int_reqs--;
+ }
+ }
+
+ if (unlikely(urb->unlinked)) {
+ COUNT(fotg210->stats.unlink);
+ } else {
+ /* report non-error and short read status as zero */
+ if (status == -EINPROGRESS || status == -EREMOTEIO)
+ status = 0;
+ COUNT(fotg210->stats.complete);
+ }
+
+#ifdef FOTG210_URB_TRACE
+ fotg210_dbg(fotg210,
+ "%s %s urb %p ep%d%s status %d len %d/%d\n",
+ __func__, urb->dev->devpath, urb,
+ usb_pipeendpoint(urb->pipe),
+ usb_pipein(urb->pipe) ? "in" : "out",
+ status,
+ urb->actual_length, urb->transfer_buffer_length);
+#endif
+
+ /* complete() can reenter this HCD */
+ usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb);
+ spin_unlock(&fotg210->lock);
+ usb_hcd_giveback_urb(fotg210_to_hcd(fotg210), urb, status);
+ spin_lock(&fotg210->lock);
+}
+
+static int qh_schedule(struct fotg210_hcd *fotg210, struct fotg210_qh *qh);
+
+/*
+ * Process and free completed qtds for a qh, returning URBs to drivers.
+ * Chases up to qh->hw_current. Returns number of completions called,
+ * indicating how much "real" work we did.
+ */
+static unsigned
+qh_completions(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
+{
+ struct fotg210_qtd *last, *end = qh->dummy;
+ struct list_head *entry, *tmp;
+ int last_status;
+ int stopped;
+ unsigned count = 0;
+ u8 state;
+ struct fotg210_qh_hw *hw = qh->hw;
+
+ if (unlikely(list_empty(&qh->qtd_list)))
+ return count;
+
+ /* completions (or tasks on other cpus) must never clobber HALT
+ * till we've gone through and cleaned everything up, even when
+ * they add urbs to this qh's queue or mark them for unlinking.
+ *
+ * NOTE: unlinking expects to be done in queue order.
+ *
+ * It's a bug for qh->qh_state to be anything other than
+ * QH_STATE_IDLE, unless our caller is scan_async() or
+ * scan_intr().
+ */
+ state = qh->qh_state;
+ qh->qh_state = QH_STATE_COMPLETING;
+ stopped = (state == QH_STATE_IDLE);
+
+ rescan:
+ last = NULL;
+ last_status = -EINPROGRESS;
+ qh->needs_rescan = 0;
+
+ /* remove de-activated QTDs from front of queue.
+ * after faults (including short reads), cleanup this urb
+ * then let the queue advance.
+ * if queue is stopped, handles unlinks.
+ */
+ list_for_each_safe(entry, tmp, &qh->qtd_list) {
+ struct fotg210_qtd *qtd;
+ struct urb *urb;
+ u32 token = 0;
+
+ qtd = list_entry(entry, struct fotg210_qtd, qtd_list);
+ urb = qtd->urb;
+
+ /* clean up any state from previous QTD ...*/
+ if (last) {
+ if (likely(last->urb != urb)) {
+ fotg210_urb_done(fotg210, last->urb,
+ last_status);
+ count++;
+ last_status = -EINPROGRESS;
+ }
+ fotg210_qtd_free(fotg210, last);
+ last = NULL;
+ }
+
+ /* ignore urbs submitted during completions we reported */
+ if (qtd == end)
+ break;
+
+ /* hardware copies qtd out of qh overlay */
+ rmb();
+ token = hc32_to_cpu(fotg210, qtd->hw_token);
+
+ /* always clean up qtds the hc de-activated */
+ retry_xacterr:
+ if ((token & QTD_STS_ACTIVE) == 0) {
+
+ /* Report Data Buffer Error: non-fatal but useful */
+ if (token & QTD_STS_DBE)
+ fotg210_dbg(fotg210,
+ "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n",
+ urb,
+ usb_endpoint_num(&urb->ep->desc),
+ usb_endpoint_dir_in(&urb->ep->desc)
+ ? "in" : "out",
+ urb->transfer_buffer_length,
+ qtd,
+ qh);
+
+ /* on STALL, error, and short reads this urb must
+ * complete and all its qtds must be recycled.
+ */
+ if ((token & QTD_STS_HALT) != 0) {
+
+ /* retry transaction errors until we
+ * reach the software xacterr limit
+ */
+ if ((token & QTD_STS_XACT) &&
+ QTD_CERR(token) == 0 &&
+ ++qh->xacterrs < QH_XACTERR_MAX &&
+ !urb->unlinked) {
+ fotg210_dbg(fotg210,
+ "detected XactErr len %zu/%zu retry %d\n",
+ qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs);
+
+ /* reset the token in the qtd and the
+ * qh overlay (which still contains
+ * the qtd) so that we pick up from
+ * where we left off
+ */
+ token &= ~QTD_STS_HALT;
+ token |= QTD_STS_ACTIVE |
+ (FOTG210_TUNE_CERR << 10);
+ qtd->hw_token = cpu_to_hc32(fotg210,
+ token);
+ wmb();
+ hw->hw_token = cpu_to_hc32(fotg210,
+ token);
+ goto retry_xacterr;
+ }
+ stopped = 1;
+
+ /* magic dummy for some short reads; qh won't advance.
+ * that silicon quirk can kick in with this dummy too.
+ *
+ * other short reads won't stop the queue, including
+ * control transfers (status stage handles that) or
+ * most other single-qtd reads ... the queue stops if
+ * URB_SHORT_NOT_OK was set so the driver submitting
+ * the urbs could clean it up.
+ */
+ } else if (IS_SHORT_READ(token)
+ && !(qtd->hw_alt_next
+ & FOTG210_LIST_END(fotg210))) {
+ stopped = 1;
+ }
+
+ /* stop scanning when we reach qtds the hc is using */
+ } else if (likely(!stopped
+ && fotg210->rh_state >= FOTG210_RH_RUNNING)) {
+ break;
+
+ /* scan the whole queue for unlinks whenever it stops */
+ } else {
+ stopped = 1;
+
+ /* cancel everything if we halt, suspend, etc */
+ if (fotg210->rh_state < FOTG210_RH_RUNNING)
+ last_status = -ESHUTDOWN;
+
+ /* this qtd is active; skip it unless a previous qtd
+ * for its urb faulted, or its urb was canceled.
+ */
+ else if (last_status == -EINPROGRESS && !urb->unlinked)
+ continue;
+
+ /* qh unlinked; token in overlay may be most current */
+ if (state == QH_STATE_IDLE
+ && cpu_to_hc32(fotg210, qtd->qtd_dma)
+ == hw->hw_current) {
+ token = hc32_to_cpu(fotg210, hw->hw_token);
+
+ /* An unlink may leave an incomplete
+ * async transaction in the TT buffer.
+ * We have to clear it.
+ */
+ fotg210_clear_tt_buffer(fotg210, qh, urb,
+ token);
+ }
+ }
+
+ /* unless we already know the urb's status, collect qtd status
+ * and update count of bytes transferred. in common short read
+ * cases with only one data qtd (including control transfers),
+ * queue processing won't halt. but with two or more qtds (for
+ * example, with a 32 KB transfer), when the first qtd gets a
+ * short read the second must be removed by hand.
+ */
+ if (last_status == -EINPROGRESS) {
+ last_status = qtd_copy_status(fotg210, urb,
+ qtd->length, token);
+ if (last_status == -EREMOTEIO
+ && (qtd->hw_alt_next
+ & FOTG210_LIST_END(fotg210)))
+ last_status = -EINPROGRESS;
+
+ /* As part of low/full-speed endpoint-halt processing
+ * we must clear the TT buffer (11.17.5).
+ */
+ if (unlikely(last_status != -EINPROGRESS &&
+ last_status != -EREMOTEIO)) {
+ /* The TT's in some hubs malfunction when they
+ * receive this request following a STALL (they
+ * stop sending isochronous packets). Since a
+ * STALL can't leave the TT buffer in a busy
+ * state (if you believe Figures 11-48 - 11-51
+ * in the USB 2.0 spec), we won't clear the TT
+ * buffer in this case. Strictly speaking this
+ * is a violation of the spec.
+ */
+ if (last_status != -EPIPE)
+ fotg210_clear_tt_buffer(fotg210, qh,
+ urb, token);
+ }
+ }
+
+ /* if we're removing something not at the queue head,
+ * patch the hardware queue pointer.
+ */
+ if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
+ last = list_entry(qtd->qtd_list.prev,
+ struct fotg210_qtd, qtd_list);
+ last->hw_next = qtd->hw_next;
+ }
+
+ /* remove qtd; it's recycled after possible urb completion */
+ list_del(&qtd->qtd_list);
+ last = qtd;
+
+ /* reinit the xacterr counter for the next qtd */
+ qh->xacterrs = 0;
+ }
+
+ /* last urb's completion might still need calling */
+ if (likely(last != NULL)) {
+ fotg210_urb_done(fotg210, last->urb, last_status);
+ count++;
+ fotg210_qtd_free(fotg210, last);
+ }
+
+ /* Do we need to rescan for URBs dequeued during a giveback? */
+ if (unlikely(qh->needs_rescan)) {
+ /* If the QH is already unlinked, do the rescan now. */
+ if (state == QH_STATE_IDLE)
+ goto rescan;
+
+ /* Otherwise we have to wait until the QH is fully unlinked.
+ * Our caller will start an unlink if qh->needs_rescan is
+ * set. But if an unlink has already started, nothing needs
+ * to be done.
+ */
+ if (state != QH_STATE_LINKED)
+ qh->needs_rescan = 0;
+ }
+
+ /* restore original state; caller must unlink or relink */
+ qh->qh_state = state;
+
+ /* be sure the hardware's done with the qh before refreshing
+ * it after fault cleanup, or recovering from silicon wrongly
+ * overlaying the dummy qtd (which reduces DMA chatter).
+ */
+ if (stopped != 0 || hw->hw_qtd_next == FOTG210_LIST_END(fotg210)) {
+ switch (state) {
+ case QH_STATE_IDLE:
+ qh_refresh(fotg210, qh);
+ break;
+ case QH_STATE_LINKED:
+ /* We won't refresh a QH that's linked (after the HC
+ * stopped the queue). That avoids a race:
+ * - HC reads first part of QH;
+ * - CPU updates that first part and the token;
+ * - HC reads rest of that QH, including token
+ * Result: HC gets an inconsistent image, and then
+ * DMAs to/from the wrong memory (corrupting it).
+ *
+ * That should be rare for interrupt transfers,
+ * except maybe high bandwidth ...
+ */
+
+ /* Tell the caller to start an unlink */
+ qh->needs_rescan = 1;
+ break;
+ /* otherwise, unlink already started */
+ }
+ }
+
+ return count;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
+#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
+/* ... and packet size, for any kind of endpoint descriptor */
+#define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
+
+/*
+ * reverse of qh_urb_transaction: free a list of TDs.
+ * used for cleanup after errors, before HC sees an URB's TDs.
+ */
+static void qtd_list_free(
+ struct fotg210_hcd *fotg210,
+ struct urb *urb,
+ struct list_head *qtd_list
+) {
+ struct list_head *entry, *temp;
+
+ list_for_each_safe(entry, temp, qtd_list) {
+ struct fotg210_qtd *qtd;
+
+ qtd = list_entry(entry, struct fotg210_qtd, qtd_list);
+ list_del(&qtd->qtd_list);
+ fotg210_qtd_free(fotg210, qtd);
+ }
+}
+
+/*
+ * create a list of filled qtds for this URB; won't link into qh.
+ */
+static struct list_head *
+qh_urb_transaction(
+ struct fotg210_hcd *fotg210,
+ struct urb *urb,
+ struct list_head *head,
+ gfp_t flags
+) {
+ struct fotg210_qtd *qtd, *qtd_prev;
+ dma_addr_t buf;
+ int len, this_sg_len, maxpacket;
+ int is_input;
+ u32 token;
+ int i;
+ struct scatterlist *sg;
+
+ /*
+ * URBs map to sequences of QTDs: one logical transaction
+ */
+ qtd = fotg210_qtd_alloc(fotg210, flags);
+ if (unlikely(!qtd))
+ return NULL;
+ list_add_tail(&qtd->qtd_list, head);
+ qtd->urb = urb;
+
+ token = QTD_STS_ACTIVE;
+ token |= (FOTG210_TUNE_CERR << 10);
+ /* for split transactions, SplitXState initialized to zero */
+
+ len = urb->transfer_buffer_length;
+ is_input = usb_pipein(urb->pipe);
+ if (usb_pipecontrol(urb->pipe)) {
+ /* SETUP pid */
+ qtd_fill(fotg210, qtd, urb->setup_dma,
+ sizeof(struct usb_ctrlrequest),
+ token | (2 /* "setup" */ << 8), 8);
+
+ /* ... and always at least one more pid */
+ token ^= QTD_TOGGLE;
+ qtd_prev = qtd;
+ qtd = fotg210_qtd_alloc(fotg210, flags);
+ if (unlikely(!qtd))
+ goto cleanup;
+ qtd->urb = urb;
+ qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma);
+ list_add_tail(&qtd->qtd_list, head);
+
+ /* for zero length DATA stages, STATUS is always IN */
+ if (len == 0)
+ token |= (1 /* "in" */ << 8);
+ }
+
+ /*
+ * data transfer stage: buffer setup
+ */
+ i = urb->num_mapped_sgs;
+ if (len > 0 && i > 0) {
+ sg = urb->sg;
+ buf = sg_dma_address(sg);
+
+ /* urb->transfer_buffer_length may be smaller than the
+ * size of the scatterlist (or vice versa)
+ */
+ this_sg_len = min_t(int, sg_dma_len(sg), len);
+ } else {
+ sg = NULL;
+ buf = urb->transfer_dma;
+ this_sg_len = len;
+ }
+
+ if (is_input)
+ token |= (1 /* "in" */ << 8);
+ /* else it's already initted to "out" pid (0 << 8) */
+
+ maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
+
+ /*
+ * buffer gets wrapped in one or more qtds;
+ * last one may be "short" (including zero len)
+ * and may serve as a control status ack
+ */
+ for (;;) {
+ int this_qtd_len;
+
+ this_qtd_len = qtd_fill(fotg210, qtd, buf, this_sg_len, token,
+ maxpacket);
+ this_sg_len -= this_qtd_len;
+ len -= this_qtd_len;
+ buf += this_qtd_len;
+
+ /*
+ * short reads advance to a "magic" dummy instead of the next
+ * qtd ... that forces the queue to stop, for manual cleanup.
+ * (this will usually be overridden later.)
+ */
+ if (is_input)
+ qtd->hw_alt_next = fotg210->async->hw->hw_alt_next;
+
+ /* qh makes control packets use qtd toggle; maybe switch it */
+ if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
+ token ^= QTD_TOGGLE;
+
+ if (likely(this_sg_len <= 0)) {
+ if (--i <= 0 || len <= 0)
+ break;
+ sg = sg_next(sg);
+ buf = sg_dma_address(sg);
+ this_sg_len = min_t(int, sg_dma_len(sg), len);
+ }
+
+ qtd_prev = qtd;
+ qtd = fotg210_qtd_alloc(fotg210, flags);
+ if (unlikely(!qtd))
+ goto cleanup;
+ qtd->urb = urb;
+ qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma);
+ list_add_tail(&qtd->qtd_list, head);
+ }
+
+ /*
+ * unless the caller requires manual cleanup after short reads,
+ * have the alt_next mechanism keep the queue running after the
+ * last data qtd (the only one, for control and most other cases).
+ */
+ if (likely((urb->transfer_flags & URB_SHORT_NOT_OK) == 0
+ || usb_pipecontrol(urb->pipe)))
+ qtd->hw_alt_next = FOTG210_LIST_END(fotg210);
+
+ /*
+ * control requests may need a terminating data "status" ack;
+ * other OUT ones may need a terminating short packet
+ * (zero length).
+ */
+ if (likely(urb->transfer_buffer_length != 0)) {
+ int one_more = 0;
+
+ if (usb_pipecontrol(urb->pipe)) {
+ one_more = 1;
+ token ^= 0x0100; /* "in" <--> "out" */
+ token |= QTD_TOGGLE; /* force DATA1 */
+ } else if (usb_pipeout(urb->pipe)
+ && (urb->transfer_flags & URB_ZERO_PACKET)
+ && !(urb->transfer_buffer_length % maxpacket)) {
+ one_more = 1;
+ }
+ if (one_more) {
+ qtd_prev = qtd;
+ qtd = fotg210_qtd_alloc(fotg210, flags);
+ if (unlikely(!qtd))
+ goto cleanup;
+ qtd->urb = urb;
+ qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma);
+ list_add_tail(&qtd->qtd_list, head);
+
+ /* never any data in such packets */
+ qtd_fill(fotg210, qtd, 0, 0, token, 0);
+ }
+ }
+
+ /* by default, enable interrupt on urb completion */
+ if (likely(!(urb->transfer_flags & URB_NO_INTERRUPT)))
+ qtd->hw_token |= cpu_to_hc32(fotg210, QTD_IOC);
+ return head;
+
+cleanup:
+ qtd_list_free(fotg210, urb, head);
+ return NULL;
+}
+
+/*-------------------------------------------------------------------------*/
+/*
+ * Would be best to create all qh's from config descriptors,
+ * when each interface/altsetting is established. Unlink
+ * any previous qh and cancel its urbs first; endpoints are
+ * implicitly reset then (data toggle too).
+ * That'd mean updating how usbcore talks to HCDs. (2.7?)
+*/
+
+
+/*
+ * Each QH holds a qtd list; a QH is used for everything except iso.
+ *
+ * For interrupt urbs, the scheduler must set the microframe scheduling
+ * mask(s) each time the QH gets scheduled. For highspeed, that's
+ * just one microframe in the s-mask. For split interrupt transactions
+ * there are additional complications: c-mask, maybe FSTNs.
+ */
+static struct fotg210_qh *
+qh_make(
+ struct fotg210_hcd *fotg210,
+ struct urb *urb,
+ gfp_t flags
+) {
+ struct fotg210_qh *qh = fotg210_qh_alloc(fotg210, flags);
+ u32 info1 = 0, info2 = 0;
+ int is_input, type;
+ int maxp = 0;
+ struct usb_tt *tt = urb->dev->tt;
+ struct fotg210_qh_hw *hw;
+
+ if (!qh)
+ return qh;
+
+ /*
+ * init endpoint/device data for this QH
+ */
+ info1 |= usb_pipeendpoint(urb->pipe) << 8;
+ info1 |= usb_pipedevice(urb->pipe) << 0;
+
+ is_input = usb_pipein(urb->pipe);
+ type = usb_pipetype(urb->pipe);
+ maxp = usb_maxpacket(urb->dev, urb->pipe, !is_input);
+
+ /* 1024 byte maxpacket is a hardware ceiling. High bandwidth
+ * acts like up to 3KB, but is built from smaller packets.
+ */
+ if (max_packet(maxp) > 1024) {
+ fotg210_dbg(fotg210, "bogus qh maxpacket %d\n",
+ max_packet(maxp));
+ goto done;
+ }
+
+ /* Compute interrupt scheduling parameters just once, and save.
+ * - allowing for high bandwidth, how many nsec/uframe are used?
+ * - split transactions need a second CSPLIT uframe; same question
+ * - splits also need a schedule gap (for full/low speed I/O)
+ * - qh has a polling interval
+ *
+ * For control/bulk requests, the HC or TT handles these.
+ */
+ if (type == PIPE_INTERRUPT) {
+ qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
+ is_input, 0,
+ hb_mult(maxp) * max_packet(maxp)));
+ qh->start = NO_FRAME;
+
+ if (urb->dev->speed == USB_SPEED_HIGH) {
+ qh->c_usecs = 0;
+ qh->gap_uf = 0;
+
+ qh->period = urb->interval >> 3;
+ if (qh->period == 0 && urb->interval != 1) {
+ /* NOTE interval 2 or 4 uframes could work.
+ * But interval 1 scheduling is simpler, and
+ * includes high bandwidth.
+ */
+ urb->interval = 1;
+ } else if (qh->period > fotg210->periodic_size) {
+ qh->period = fotg210->periodic_size;
+ urb->interval = qh->period << 3;
+ }
+ } else {
+ int think_time;
+
+ /* gap is f(FS/LS transfer times) */
+ qh->gap_uf = 1 + usb_calc_bus_time(urb->dev->speed,
+ is_input, 0, maxp) / (125 * 1000);
+
+ /* FIXME this just approximates SPLIT/CSPLIT times */
+ if (is_input) { /* SPLIT, gap, CSPLIT+DATA */
+ qh->c_usecs = qh->usecs + HS_USECS(0);
+ qh->usecs = HS_USECS(1);
+ } else { /* SPLIT+DATA, gap, CSPLIT */
+ qh->usecs += HS_USECS(1);
+ qh->c_usecs = HS_USECS(0);
+ }
+
+ think_time = tt ? tt->think_time : 0;
+ qh->tt_usecs = NS_TO_US(think_time +
+ usb_calc_bus_time(urb->dev->speed,
+ is_input, 0, max_packet(maxp)));
+ qh->period = urb->interval;
+ if (qh->period > fotg210->periodic_size) {
+ qh->period = fotg210->periodic_size;
+ urb->interval = qh->period;
+ }
+ }
+ }
+
+ /* support for tt scheduling, and access to toggles */
+ qh->dev = urb->dev;
+
+ /* using TT? */
+ switch (urb->dev->speed) {
+ case USB_SPEED_LOW:
+ info1 |= QH_LOW_SPEED;
+ /* FALL THROUGH */
+
+ case USB_SPEED_FULL:
+ /* EPS 0 means "full" */
+ if (type != PIPE_INTERRUPT)
+ info1 |= (FOTG210_TUNE_RL_TT << 28);
+ if (type == PIPE_CONTROL) {
+ info1 |= QH_CONTROL_EP; /* for TT */
+ info1 |= QH_TOGGLE_CTL; /* toggle from qtd */
+ }
+ info1 |= maxp << 16;
+
+ info2 |= (FOTG210_TUNE_MULT_TT << 30);
+
+ /* Some Freescale processors have an erratum in which the
+ * port number in the queue head was 0..N-1 instead of 1..N.
+ */
+ if (fotg210_has_fsl_portno_bug(fotg210))
+ info2 |= (urb->dev->ttport-1) << 23;
+ else
+ info2 |= urb->dev->ttport << 23;
+
+ /* set the address of the TT; for TDI's integrated
+ * root hub tt, leave it zeroed.
+ */
+ if (tt && tt->hub != fotg210_to_hcd(fotg210)->self.root_hub)
+ info2 |= tt->hub->devnum << 16;
+
+ /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */
+
+ break;
+
+ case USB_SPEED_HIGH: /* no TT involved */
+ info1 |= QH_HIGH_SPEED;
+ if (type == PIPE_CONTROL) {
+ info1 |= (FOTG210_TUNE_RL_HS << 28);
+ info1 |= 64 << 16; /* usb2 fixed maxpacket */
+ info1 |= QH_TOGGLE_CTL; /* toggle from qtd */
+ info2 |= (FOTG210_TUNE_MULT_HS << 30);
+ } else if (type == PIPE_BULK) {
+ info1 |= (FOTG210_TUNE_RL_HS << 28);
+ /* The USB spec says that high speed bulk endpoints
+ * always use 512 byte maxpacket. But some device
+ * vendors decided to ignore that, and MSFT is happy
+ * to help them do so. So now people expect to use
+ * such nonconformant devices with Linux too; sigh.
+ */
+ info1 |= max_packet(maxp) << 16;
+ info2 |= (FOTG210_TUNE_MULT_HS << 30);
+ } else { /* PIPE_INTERRUPT */
+ info1 |= max_packet(maxp) << 16;
+ info2 |= hb_mult(maxp) << 30;
+ }
+ break;
+ default:
+ fotg210_dbg(fotg210, "bogus dev %p speed %d\n", urb->dev,
+ urb->dev->speed);
+done:
+ qh_destroy(fotg210, qh);
+ return NULL;
+ }
+
+ /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */
+
+ /* init as live, toggle clear, advance to dummy */
+ qh->qh_state = QH_STATE_IDLE;
+ hw = qh->hw;
+ hw->hw_info1 = cpu_to_hc32(fotg210, info1);
+ hw->hw_info2 = cpu_to_hc32(fotg210, info2);
+ qh->is_out = !is_input;
+ usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, 1);
+ qh_refresh(fotg210, qh);
+ return qh;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void enable_async(struct fotg210_hcd *fotg210)
+{
+ if (fotg210->async_count++)
+ return;
+
+ /* Stop waiting to turn off the async schedule */
+ fotg210->enabled_hrtimer_events &= ~BIT(FOTG210_HRTIMER_DISABLE_ASYNC);
+
+ /* Don't start the schedule until ASS is 0 */
+ fotg210_poll_ASS(fotg210);
+ turn_on_io_watchdog(fotg210);
+}
+
+static void disable_async(struct fotg210_hcd *fotg210)
+{
+ if (--fotg210->async_count)
+ return;
+
+ /* The async schedule and async_unlink list are supposed to be empty */
+ WARN_ON(fotg210->async->qh_next.qh || fotg210->async_unlink);
+
+ /* Don't turn off the schedule until ASS is 1 */
+ fotg210_poll_ASS(fotg210);
+}
+
+/* move qh (and its qtds) onto async queue; maybe enable queue. */
+
+static void qh_link_async(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
+{
+ __hc32 dma = QH_NEXT(fotg210, qh->qh_dma);
+ struct fotg210_qh *head;
+
+ /* Don't link a QH if there's a Clear-TT-Buffer pending */
+ if (unlikely(qh->clearing_tt))
+ return;
+
+ WARN_ON(qh->qh_state != QH_STATE_IDLE);
+
+ /* clear halt and/or toggle; and maybe recover from silicon quirk */
+ qh_refresh(fotg210, qh);
+
+ /* splice right after start */
+ head = fotg210->async;
+ qh->qh_next = head->qh_next;
+ qh->hw->hw_next = head->hw->hw_next;
+ wmb();
+
+ head->qh_next.qh = qh;
+ head->hw->hw_next = dma;
+
+ qh->xacterrs = 0;
+ qh->qh_state = QH_STATE_LINKED;
+ /* qtd completions reported later by interrupt */
+
+ enable_async(fotg210);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * For control/bulk/interrupt, return QH with these TDs appended.
+ * Allocates and initializes the QH if necessary.
+ * Returns null if it can't allocate a QH it needs to.
+ * If the QH has TDs (urbs) already, that's great.
+ */
+static struct fotg210_qh *qh_append_tds(
+ struct fotg210_hcd *fotg210,
+ struct urb *urb,
+ struct list_head *qtd_list,
+ int epnum,
+ void **ptr
+)
+{
+ struct fotg210_qh *qh = NULL;
+ __hc32 qh_addr_mask = cpu_to_hc32(fotg210, 0x7f);
+
+ qh = (struct fotg210_qh *) *ptr;
+ if (unlikely(qh == NULL)) {
+ /* can't sleep here, we have fotg210->lock... */
+ qh = qh_make(fotg210, urb, GFP_ATOMIC);
+ *ptr = qh;
+ }
+ if (likely(qh != NULL)) {
+ struct fotg210_qtd *qtd;
+
+ if (unlikely(list_empty(qtd_list)))
+ qtd = NULL;
+ else
+ qtd = list_entry(qtd_list->next, struct fotg210_qtd,
+ qtd_list);
+
+ /* control qh may need patching ... */
+ if (unlikely(epnum == 0)) {
+ /* usb_reset_device() briefly reverts to address 0 */
+ if (usb_pipedevice(urb->pipe) == 0)
+ qh->hw->hw_info1 &= ~qh_addr_mask;
+ }
+
+ /* just one way to queue requests: swap with the dummy qtd.
+ * only hc or qh_refresh() ever modify the overlay.
+ */
+ if (likely(qtd != NULL)) {
+ struct fotg210_qtd *dummy;
+ dma_addr_t dma;
+ __hc32 token;
+
+ /* to avoid racing the HC, use the dummy td instead of
+ * the first td of our list (becomes new dummy). both
+ * tds stay deactivated until we're done, when the
+ * HC is allowed to fetch the old dummy (4.10.2).
+ */
+ token = qtd->hw_token;
+ qtd->hw_token = HALT_BIT(fotg210);
+
+ dummy = qh->dummy;
+
+ dma = dummy->qtd_dma;
+ *dummy = *qtd;
+ dummy->qtd_dma = dma;
+
+ list_del(&qtd->qtd_list);
+ list_add(&dummy->qtd_list, qtd_list);
+ list_splice_tail(qtd_list, &qh->qtd_list);
+
+ fotg210_qtd_init(fotg210, qtd, qtd->qtd_dma);
+ qh->dummy = qtd;
+
+ /* hc must see the new dummy at list end */
+ dma = qtd->qtd_dma;
+ qtd = list_entry(qh->qtd_list.prev,
+ struct fotg210_qtd, qtd_list);
+ qtd->hw_next = QTD_NEXT(fotg210, dma);
+
+ /* let the hc process these next qtds */
+ wmb();
+ dummy->hw_token = token;
+
+ urb->hcpriv = qh;
+ }
+ }
+ return qh;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int
+submit_async(
+ struct fotg210_hcd *fotg210,
+ struct urb *urb,
+ struct list_head *qtd_list,
+ gfp_t mem_flags
+) {
+ int epnum;
+ unsigned long flags;
+ struct fotg210_qh *qh = NULL;
+ int rc;
+
+ epnum = urb->ep->desc.bEndpointAddress;
+
+#ifdef FOTG210_URB_TRACE
+ {
+ struct fotg210_qtd *qtd;
+ qtd = list_entry(qtd_list->next, struct fotg210_qtd, qtd_list);
+ fotg210_dbg(fotg210,
+ "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
+ __func__, urb->dev->devpath, urb,
+ epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out",
+ urb->transfer_buffer_length,
+ qtd, urb->ep->hcpriv);
+ }
+#endif
+
+ spin_lock_irqsave(&fotg210->lock, flags);
+ if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) {
+ rc = -ESHUTDOWN;
+ goto done;
+ }
+ rc = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb);
+ if (unlikely(rc))
+ goto done;
+
+ qh = qh_append_tds(fotg210, urb, qtd_list, epnum, &urb->ep->hcpriv);
+ if (unlikely(qh == NULL)) {
+ usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb);
+ rc = -ENOMEM;
+ goto done;
+ }
+
+ /* Control/bulk operations through TTs don't need scheduling,
+ * the HC and TT handle it when the TT has a buffer ready.
+ */
+ if (likely(qh->qh_state == QH_STATE_IDLE))
+ qh_link_async(fotg210, qh);
+ done:
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ if (unlikely(qh == NULL))
+ qtd_list_free(fotg210, urb, qtd_list);
+ return rc;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void single_unlink_async(struct fotg210_hcd *fotg210,
+ struct fotg210_qh *qh)
+{
+ struct fotg210_qh *prev;
+
+ /* Add to the end of the list of QHs waiting for the next IAAD */
+ qh->qh_state = QH_STATE_UNLINK;
+ if (fotg210->async_unlink)
+ fotg210->async_unlink_last->unlink_next = qh;
+ else
+ fotg210->async_unlink = qh;
+ fotg210->async_unlink_last = qh;
+
+ /* Unlink it from the schedule */
+ prev = fotg210->async;
+ while (prev->qh_next.qh != qh)
+ prev = prev->qh_next.qh;
+
+ prev->hw->hw_next = qh->hw->hw_next;
+ prev->qh_next = qh->qh_next;
+ if (fotg210->qh_scan_next == qh)
+ fotg210->qh_scan_next = qh->qh_next.qh;
+}
+
+static void start_iaa_cycle(struct fotg210_hcd *fotg210, bool nested)
+{
+ /*
+ * Do nothing if an IAA cycle is already running or
+ * if one will be started shortly.
+ */
+ if (fotg210->async_iaa || fotg210->async_unlinking)
+ return;
+
+ /* Do all the waiting QHs at once */
+ fotg210->async_iaa = fotg210->async_unlink;
+ fotg210->async_unlink = NULL;
+
+ /* If the controller isn't running, we don't have to wait for it */
+ if (unlikely(fotg210->rh_state < FOTG210_RH_RUNNING)) {
+ if (!nested) /* Avoid recursion */
+ end_unlink_async(fotg210);
+
+ /* Otherwise start a new IAA cycle */
+ } else if (likely(fotg210->rh_state == FOTG210_RH_RUNNING)) {
+ /* Make sure the unlinks are all visible to the hardware */
+ wmb();
+
+ fotg210_writel(fotg210, fotg210->command | CMD_IAAD,
+ &fotg210->regs->command);
+ fotg210_readl(fotg210, &fotg210->regs->command);
+ fotg210_enable_event(fotg210, FOTG210_HRTIMER_IAA_WATCHDOG,
+ true);
+ }
+}
+
+/* the async qh for the qtds being unlinked are now gone from the HC */
+
+static void end_unlink_async(struct fotg210_hcd *fotg210)
+{
+ struct fotg210_qh *qh;
+
+ /* Process the idle QHs */
+ restart:
+ fotg210->async_unlinking = true;
+ while (fotg210->async_iaa) {
+ qh = fotg210->async_iaa;
+ fotg210->async_iaa = qh->unlink_next;
+ qh->unlink_next = NULL;
+
+ qh->qh_state = QH_STATE_IDLE;
+ qh->qh_next.qh = NULL;
+
+ qh_completions(fotg210, qh);
+ if (!list_empty(&qh->qtd_list) &&
+ fotg210->rh_state == FOTG210_RH_RUNNING)
+ qh_link_async(fotg210, qh);
+ disable_async(fotg210);
+ }
+ fotg210->async_unlinking = false;
+
+ /* Start a new IAA cycle if any QHs are waiting for it */
+ if (fotg210->async_unlink) {
+ start_iaa_cycle(fotg210, true);
+ if (unlikely(fotg210->rh_state < FOTG210_RH_RUNNING))
+ goto restart;
+ }
+}
+
+static void unlink_empty_async(struct fotg210_hcd *fotg210)
+{
+ struct fotg210_qh *qh, *next;
+ bool stopped = (fotg210->rh_state < FOTG210_RH_RUNNING);
+ bool check_unlinks_later = false;
+
+ /* Unlink all the async QHs that have been empty for a timer cycle */
+ next = fotg210->async->qh_next.qh;
+ while (next) {
+ qh = next;
+ next = qh->qh_next.qh;
+
+ if (list_empty(&qh->qtd_list) &&
+ qh->qh_state == QH_STATE_LINKED) {
+ if (!stopped && qh->unlink_cycle ==
+ fotg210->async_unlink_cycle)
+ check_unlinks_later = true;
+ else
+ single_unlink_async(fotg210, qh);
+ }
+ }
+
+ /* Start a new IAA cycle if any QHs are waiting for it */
+ if (fotg210->async_unlink)
+ start_iaa_cycle(fotg210, false);
+
+ /* QHs that haven't been empty for long enough will be handled later */
+ if (check_unlinks_later) {
+ fotg210_enable_event(fotg210, FOTG210_HRTIMER_ASYNC_UNLINKS,
+ true);
+ ++fotg210->async_unlink_cycle;
+ }
+}
+
+/* makes sure the async qh will become idle */
+/* caller must own fotg210->lock */
+
+static void start_unlink_async(struct fotg210_hcd *fotg210,
+ struct fotg210_qh *qh)
+{
+ /*
+ * If the QH isn't linked then there's nothing we can do
+ * unless we were called during a giveback, in which case
+ * qh_completions() has to deal with it.
+ */
+ if (qh->qh_state != QH_STATE_LINKED) {
+ if (qh->qh_state == QH_STATE_COMPLETING)
+ qh->needs_rescan = 1;
+ return;
+ }
+
+ single_unlink_async(fotg210, qh);
+ start_iaa_cycle(fotg210, false);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void scan_async(struct fotg210_hcd *fotg210)
+{
+ struct fotg210_qh *qh;
+ bool check_unlinks_later = false;
+
+ fotg210->qh_scan_next = fotg210->async->qh_next.qh;
+ while (fotg210->qh_scan_next) {
+ qh = fotg210->qh_scan_next;
+ fotg210->qh_scan_next = qh->qh_next.qh;
+ rescan:
+ /* clean any finished work for this qh */
+ if (!list_empty(&qh->qtd_list)) {
+ int temp;
+
+ /*
+ * Unlinks could happen here; completion reporting
+ * drops the lock. That's why fotg210->qh_scan_next
+ * always holds the next qh to scan; if the next qh
+ * gets unlinked then fotg210->qh_scan_next is adjusted
+ * in single_unlink_async().
+ */
+ temp = qh_completions(fotg210, qh);
+ if (qh->needs_rescan) {
+ start_unlink_async(fotg210, qh);
+ } else if (list_empty(&qh->qtd_list)
+ && qh->qh_state == QH_STATE_LINKED) {
+ qh->unlink_cycle = fotg210->async_unlink_cycle;
+ check_unlinks_later = true;
+ } else if (temp != 0)
+ goto rescan;
+ }
+ }
+
+ /*
+ * Unlink empty entries, reducing DMA usage as well
+ * as HCD schedule-scanning costs. Delay for any qh
+ * we just scanned, there's a not-unusual case that it
+ * doesn't stay idle for long.
+ */
+ if (check_unlinks_later && fotg210->rh_state == FOTG210_RH_RUNNING &&
+ !(fotg210->enabled_hrtimer_events &
+ BIT(FOTG210_HRTIMER_ASYNC_UNLINKS))) {
+ fotg210_enable_event(fotg210,
+ FOTG210_HRTIMER_ASYNC_UNLINKS, true);
+ ++fotg210->async_unlink_cycle;
+ }
+}
+/*-------------------------------------------------------------------------*/
+/*
+ * EHCI scheduled transaction support: interrupt, iso, split iso
+ * These are called "periodic" transactions in the EHCI spec.
+ *
+ * Note that for interrupt transfers, the QH/QTD manipulation is shared
+ * with the "asynchronous" transaction support (control/bulk transfers).
+ * The only real difference is in how interrupt transfers are scheduled.
+ *
+ * For ISO, we make an "iso_stream" head to serve the same role as a QH.
+ * It keeps track of every ITD (or SITD) that's linked, and holds enough
+ * pre-calculated schedule data to make appending to the queue be quick.
+ */
+
+static int fotg210_get_frame(struct usb_hcd *hcd);
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * periodic_next_shadow - return "next" pointer on shadow list
+ * @periodic: host pointer to qh/itd
+ * @tag: hardware tag for type of this record
+ */
+static union fotg210_shadow *
+periodic_next_shadow(struct fotg210_hcd *fotg210,
+ union fotg210_shadow *periodic, __hc32 tag)
+{
+ switch (hc32_to_cpu(fotg210, tag)) {
+ case Q_TYPE_QH:
+ return &periodic->qh->qh_next;
+ case Q_TYPE_FSTN:
+ return &periodic->fstn->fstn_next;
+ default:
+ return &periodic->itd->itd_next;
+ }
+}
+
+static __hc32 *
+shadow_next_periodic(struct fotg210_hcd *fotg210,
+ union fotg210_shadow *periodic, __hc32 tag)
+{
+ switch (hc32_to_cpu(fotg210, tag)) {
+ /* our fotg210_shadow.qh is actually software part */
+ case Q_TYPE_QH:
+ return &periodic->qh->hw->hw_next;
+ /* others are hw parts */
+ default:
+ return periodic->hw_next;
+ }
+}
+
+/* caller must hold fotg210->lock */
+static void periodic_unlink(struct fotg210_hcd *fotg210, unsigned frame,
+ void *ptr)
+{
+ union fotg210_shadow *prev_p = &fotg210->pshadow[frame];
+ __hc32 *hw_p = &fotg210->periodic[frame];
+ union fotg210_shadow here = *prev_p;
+
+ /* find predecessor of "ptr"; hw and shadow lists are in sync */
+ while (here.ptr && here.ptr != ptr) {
+ prev_p = periodic_next_shadow(fotg210, prev_p,
+ Q_NEXT_TYPE(fotg210, *hw_p));
+ hw_p = shadow_next_periodic(fotg210, &here,
+ Q_NEXT_TYPE(fotg210, *hw_p));
+ here = *prev_p;
+ }
+ /* an interrupt entry (at list end) could have been shared */
+ if (!here.ptr)
+ return;
+
+ /* update shadow and hardware lists ... the old "next" pointers
+ * from ptr may still be in use, the caller updates them.
+ */
+ *prev_p = *periodic_next_shadow(fotg210, &here,
+ Q_NEXT_TYPE(fotg210, *hw_p));
+
+ *hw_p = *shadow_next_periodic(fotg210, &here,
+ Q_NEXT_TYPE(fotg210, *hw_p));
+}
+
+/* how many of the uframe's 125 usecs are allocated? */
+static unsigned short
+periodic_usecs(struct fotg210_hcd *fotg210, unsigned frame, unsigned uframe)
+{
+ __hc32 *hw_p = &fotg210->periodic[frame];
+ union fotg210_shadow *q = &fotg210->pshadow[frame];
+ unsigned usecs = 0;
+ struct fotg210_qh_hw *hw;
+
+ while (q->ptr) {
+ switch (hc32_to_cpu(fotg210, Q_NEXT_TYPE(fotg210, *hw_p))) {
+ case Q_TYPE_QH:
+ hw = q->qh->hw;
+ /* is it in the S-mask? */
+ if (hw->hw_info2 & cpu_to_hc32(fotg210, 1 << uframe))
+ usecs += q->qh->usecs;
+ /* ... or C-mask? */
+ if (hw->hw_info2 & cpu_to_hc32(fotg210,
+ 1 << (8 + uframe)))
+ usecs += q->qh->c_usecs;
+ hw_p = &hw->hw_next;
+ q = &q->qh->qh_next;
+ break;
+ /* case Q_TYPE_FSTN: */
+ default:
+ /* for "save place" FSTNs, count the relevant INTR
+ * bandwidth from the previous frame
+ */
+ if (q->fstn->hw_prev != FOTG210_LIST_END(fotg210))
+ fotg210_dbg(fotg210, "ignoring FSTN cost ...\n");
+
+ hw_p = &q->fstn->hw_next;
+ q = &q->fstn->fstn_next;
+ break;
+ case Q_TYPE_ITD:
+ if (q->itd->hw_transaction[uframe])
+ usecs += q->itd->stream->usecs;
+ hw_p = &q->itd->hw_next;
+ q = &q->itd->itd_next;
+ break;
+ }
+ }
+ if (usecs > fotg210->uframe_periodic_max)
+ fotg210_err(fotg210, "uframe %d sched overrun: %d usecs\n",
+ frame * 8 + uframe, usecs);
+ return usecs;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int same_tt(struct usb_device *dev1, struct usb_device *dev2)
+{
+ if (!dev1->tt || !dev2->tt)
+ return 0;
+ if (dev1->tt != dev2->tt)
+ return 0;
+ if (dev1->tt->multi)
+ return dev1->ttport == dev2->ttport;
+ else
+ return 1;
+}
+
+/* return true iff the device's transaction translator is available
+ * for a periodic transfer starting at the specified frame, using
+ * all the uframes in the mask.
+ */
+static int tt_no_collision(
+ struct fotg210_hcd *fotg210,
+ unsigned period,
+ struct usb_device *dev,
+ unsigned frame,
+ u32 uf_mask
+)
+{
+ if (period == 0) /* error */
+ return 0;
+
+ /* note bandwidth wastage: split never follows csplit
+ * (different dev or endpoint) until the next uframe.
+ * calling convention doesn't make that distinction.
+ */
+ for (; frame < fotg210->periodic_size; frame += period) {
+ union fotg210_shadow here;
+ __hc32 type;
+ struct fotg210_qh_hw *hw;
+
+ here = fotg210->pshadow[frame];
+ type = Q_NEXT_TYPE(fotg210, fotg210->periodic[frame]);
+ while (here.ptr) {
+ switch (hc32_to_cpu(fotg210, type)) {
+ case Q_TYPE_ITD:
+ type = Q_NEXT_TYPE(fotg210, here.itd->hw_next);
+ here = here.itd->itd_next;
+ continue;
+ case Q_TYPE_QH:
+ hw = here.qh->hw;
+ if (same_tt(dev, here.qh->dev)) {
+ u32 mask;
+
+ mask = hc32_to_cpu(fotg210,
+ hw->hw_info2);
+ /* "knows" no gap is needed */
+ mask |= mask >> 8;
+ if (mask & uf_mask)
+ break;
+ }
+ type = Q_NEXT_TYPE(fotg210, hw->hw_next);
+ here = here.qh->qh_next;
+ continue;
+ /* case Q_TYPE_FSTN: */
+ default:
+ fotg210_dbg(fotg210,
+ "periodic frame %d bogus type %d\n",
+ frame, type);
+ }
+
+ /* collision or error */
+ return 0;
+ }
+ }
+
+ /* no collision */
+ return 1;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void enable_periodic(struct fotg210_hcd *fotg210)
+{
+ if (fotg210->periodic_count++)
+ return;
+
+ /* Stop waiting to turn off the periodic schedule */
+ fotg210->enabled_hrtimer_events &=
+ ~BIT(FOTG210_HRTIMER_DISABLE_PERIODIC);
+
+ /* Don't start the schedule until PSS is 0 */
+ fotg210_poll_PSS(fotg210);
+ turn_on_io_watchdog(fotg210);
+}
+
+static void disable_periodic(struct fotg210_hcd *fotg210)
+{
+ if (--fotg210->periodic_count)
+ return;
+
+ /* Don't turn off the schedule until PSS is 1 */
+ fotg210_poll_PSS(fotg210);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* periodic schedule slots have iso tds (normal or split) first, then a
+ * sparse tree for active interrupt transfers.
+ *
+ * this just links in a qh; caller guarantees uframe masks are set right.
+ * no FSTN support (yet; fotg210 0.96+)
+ */
+static void qh_link_periodic(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
+{
+ unsigned i;
+ unsigned period = qh->period;
+
+ dev_dbg(&qh->dev->dev,
+ "link qh%d-%04x/%p start %d [%d/%d us]\n",
+ period, hc32_to_cpup(fotg210, &qh->hw->hw_info2)
+ & (QH_CMASK | QH_SMASK),
+ qh, qh->start, qh->usecs, qh->c_usecs);
+
+ /* high bandwidth, or otherwise every microframe */
+ if (period == 0)
+ period = 1;
+
+ for (i = qh->start; i < fotg210->periodic_size; i += period) {
+ union fotg210_shadow *prev = &fotg210->pshadow[i];
+ __hc32 *hw_p = &fotg210->periodic[i];
+ union fotg210_shadow here = *prev;
+ __hc32 type = 0;
+
+ /* skip the iso nodes at list head */
+ while (here.ptr) {
+ type = Q_NEXT_TYPE(fotg210, *hw_p);
+ if (type == cpu_to_hc32(fotg210, Q_TYPE_QH))
+ break;
+ prev = periodic_next_shadow(fotg210, prev, type);
+ hw_p = shadow_next_periodic(fotg210, &here, type);
+ here = *prev;
+ }
+
+ /* sorting each branch by period (slow-->fast)
+ * enables sharing interior tree nodes
+ */
+ while (here.ptr && qh != here.qh) {
+ if (qh->period > here.qh->period)
+ break;
+ prev = &here.qh->qh_next;
+ hw_p = &here.qh->hw->hw_next;
+ here = *prev;
+ }
+ /* link in this qh, unless some earlier pass did that */
+ if (qh != here.qh) {
+ qh->qh_next = here;
+ if (here.qh)
+ qh->hw->hw_next = *hw_p;
+ wmb();
+ prev->qh = qh;
+ *hw_p = QH_NEXT(fotg210, qh->qh_dma);
+ }
+ }
+ qh->qh_state = QH_STATE_LINKED;
+ qh->xacterrs = 0;
+
+ /* update per-qh bandwidth for usbfs */
+ fotg210_to_hcd(fotg210)->self.bandwidth_allocated += qh->period
+ ? ((qh->usecs + qh->c_usecs) / qh->period)
+ : (qh->usecs * 8);
+
+ list_add(&qh->intr_node, &fotg210->intr_qh_list);
+
+ /* maybe enable periodic schedule processing */
+ ++fotg210->intr_count;
+ enable_periodic(fotg210);
+}
+
+static void qh_unlink_periodic(struct fotg210_hcd *fotg210,
+ struct fotg210_qh *qh)
+{
+ unsigned i;
+ unsigned period;
+
+ /*
+ * If qh is for a low/full-speed device, simply unlinking it
+ * could interfere with an ongoing split transaction. To unlink
+ * it safely would require setting the QH_INACTIVATE bit and
+ * waiting at least one frame, as described in EHCI 4.12.2.5.
+ *
+ * We won't bother with any of this. Instead, we assume that the
+ * only reason for unlinking an interrupt QH while the current URB
+ * is still active is to dequeue all the URBs (flush the whole
+ * endpoint queue).
+ *
+ * If rebalancing the periodic schedule is ever implemented, this
+ * approach will no longer be valid.
+ */
+
+ /* high bandwidth, or otherwise part of every microframe */
+ period = qh->period;
+ if (!period)
+ period = 1;
+
+ for (i = qh->start; i < fotg210->periodic_size; i += period)
+ periodic_unlink(fotg210, i, qh);
+
+ /* update per-qh bandwidth for usbfs */
+ fotg210_to_hcd(fotg210)->self.bandwidth_allocated -= qh->period
+ ? ((qh->usecs + qh->c_usecs) / qh->period)
+ : (qh->usecs * 8);
+
+ dev_dbg(&qh->dev->dev,
+ "unlink qh%d-%04x/%p start %d [%d/%d us]\n",
+ qh->period,
+ hc32_to_cpup(fotg210, &qh->hw->hw_info2) &
+ (QH_CMASK | QH_SMASK), qh, qh->start, qh->usecs, qh->c_usecs);
+
+ /* qh->qh_next still "live" to HC */
+ qh->qh_state = QH_STATE_UNLINK;
+ qh->qh_next.ptr = NULL;
+
+ if (fotg210->qh_scan_next == qh)
+ fotg210->qh_scan_next = list_entry(qh->intr_node.next,
+ struct fotg210_qh, intr_node);
+ list_del(&qh->intr_node);
+}
+
+static void start_unlink_intr(struct fotg210_hcd *fotg210,
+ struct fotg210_qh *qh)
+{
+ /* If the QH isn't linked then there's nothing we can do
+ * unless we were called during a giveback, in which case
+ * qh_completions() has to deal with it.
+ */
+ if (qh->qh_state != QH_STATE_LINKED) {
+ if (qh->qh_state == QH_STATE_COMPLETING)
+ qh->needs_rescan = 1;
+ return;
+ }
+
+ qh_unlink_periodic(fotg210, qh);
+
+ /* Make sure the unlinks are visible before starting the timer */
+ wmb();
+
+ /*
+ * The EHCI spec doesn't say how long it takes the controller to
+ * stop accessing an unlinked interrupt QH. The timer delay is
+ * 9 uframes; presumably that will be long enough.
+ */
+ qh->unlink_cycle = fotg210->intr_unlink_cycle;
+
+ /* New entries go at the end of the intr_unlink list */
+ if (fotg210->intr_unlink)
+ fotg210->intr_unlink_last->unlink_next = qh;
+ else
+ fotg210->intr_unlink = qh;
+ fotg210->intr_unlink_last = qh;
+
+ if (fotg210->intr_unlinking)
+ ; /* Avoid recursive calls */
+ else if (fotg210->rh_state < FOTG210_RH_RUNNING)
+ fotg210_handle_intr_unlinks(fotg210);
+ else if (fotg210->intr_unlink == qh) {
+ fotg210_enable_event(fotg210, FOTG210_HRTIMER_UNLINK_INTR,
+ true);
+ ++fotg210->intr_unlink_cycle;
+ }
+}
+
+static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
+{
+ struct fotg210_qh_hw *hw = qh->hw;
+ int rc;
+
+ qh->qh_state = QH_STATE_IDLE;
+ hw->hw_next = FOTG210_LIST_END(fotg210);
+
+ qh_completions(fotg210, qh);
+
+ /* reschedule QH iff another request is queued */
+ if (!list_empty(&qh->qtd_list) &&
+ fotg210->rh_state == FOTG210_RH_RUNNING) {
+ rc = qh_schedule(fotg210, qh);
+
+ /* An error here likely indicates handshake failure
+ * or no space left in the schedule. Neither fault
+ * should happen often ...
+ *
+ * FIXME kill the now-dysfunctional queued urbs
+ */
+ if (rc != 0)
+ fotg210_err(fotg210, "can't reschedule qh %p, err %d\n",
+ qh, rc);
+ }
+
+ /* maybe turn off periodic schedule */
+ --fotg210->intr_count;
+ disable_periodic(fotg210);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int check_period(
+ struct fotg210_hcd *fotg210,
+ unsigned frame,
+ unsigned uframe,
+ unsigned period,
+ unsigned usecs
+) {
+ int claimed;
+
+ /* complete split running into next frame?
+ * given FSTN support, we could sometimes check...
+ */
+ if (uframe >= 8)
+ return 0;
+
+ /* convert "usecs we need" to "max already claimed" */
+ usecs = fotg210->uframe_periodic_max - usecs;
+
+ /* we "know" 2 and 4 uframe intervals were rejected; so
+ * for period 0, check _every_ microframe in the schedule.
+ */
+ if (unlikely(period == 0)) {
+ do {
+ for (uframe = 0; uframe < 7; uframe++) {
+ claimed = periodic_usecs(fotg210, frame,
+ uframe);
+ if (claimed > usecs)
+ return 0;
+ }
+ } while ((frame += 1) < fotg210->periodic_size);
+
+ /* just check the specified uframe, at that period */
+ } else {
+ do {
+ claimed = periodic_usecs(fotg210, frame, uframe);
+ if (claimed > usecs)
+ return 0;
+ } while ((frame += period) < fotg210->periodic_size);
+ }
+
+ /* success! */
+ return 1;
+}
+
+static int check_intr_schedule(
+ struct fotg210_hcd *fotg210,
+ unsigned frame,
+ unsigned uframe,
+ const struct fotg210_qh *qh,
+ __hc32 *c_maskp
+)
+{
+ int retval = -ENOSPC;
+ u8 mask = 0;
+
+ if (qh->c_usecs && uframe >= 6) /* FSTN territory? */
+ goto done;
+
+ if (!check_period(fotg210, frame, uframe, qh->period, qh->usecs))
+ goto done;
+ if (!qh->c_usecs) {
+ retval = 0;
+ *c_maskp = 0;
+ goto done;
+ }
+
+ /* Make sure this tt's buffer is also available for CSPLITs.
+ * We pessimize a bit; probably the typical full speed case
+ * doesn't need the second CSPLIT.
+ *
+ * NOTE: both SPLIT and CSPLIT could be checked in just
+ * one smart pass...
+ */
+ mask = 0x03 << (uframe + qh->gap_uf);
+ *c_maskp = cpu_to_hc32(fotg210, mask << 8);
+
+ mask |= 1 << uframe;
+ if (tt_no_collision(fotg210, qh->period, qh->dev, frame, mask)) {
+ if (!check_period(fotg210, frame, uframe + qh->gap_uf + 1,
+ qh->period, qh->c_usecs))
+ goto done;
+ if (!check_period(fotg210, frame, uframe + qh->gap_uf,
+ qh->period, qh->c_usecs))
+ goto done;
+ retval = 0;
+ }
+done:
+ return retval;
+}
+
+/* "first fit" scheduling policy used the first time through,
+ * or when the previous schedule slot can't be re-used.
+ */
+static int qh_schedule(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
+{
+ int status;
+ unsigned uframe;
+ __hc32 c_mask;
+ unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */
+ struct fotg210_qh_hw *hw = qh->hw;
+
+ qh_refresh(fotg210, qh);
+ hw->hw_next = FOTG210_LIST_END(fotg210);
+ frame = qh->start;
+
+ /* reuse the previous schedule slots, if we can */
+ if (frame < qh->period) {
+ uframe = ffs(hc32_to_cpup(fotg210, &hw->hw_info2) & QH_SMASK);
+ status = check_intr_schedule(fotg210, frame, --uframe,
+ qh, &c_mask);
+ } else {
+ uframe = 0;
+ c_mask = 0;
+ status = -ENOSPC;
+ }
+
+ /* else scan the schedule to find a group of slots such that all
+ * uframes have enough periodic bandwidth available.
+ */
+ if (status) {
+ /* "normal" case, uframing flexible except with splits */
+ if (qh->period) {
+ int i;
+
+ for (i = qh->period; status && i > 0; --i) {
+ frame = ++fotg210->random_frame % qh->period;
+ for (uframe = 0; uframe < 8; uframe++) {
+ status = check_intr_schedule(fotg210,
+ frame, uframe, qh,
+ &c_mask);
+ if (status == 0)
+ break;
+ }
+ }
+
+ /* qh->period == 0 means every uframe */
+ } else {
+ frame = 0;
+ status = check_intr_schedule(fotg210, 0, 0, qh,
+ &c_mask);
+ }
+ if (status)
+ goto done;
+ qh->start = frame;
+
+ /* reset S-frame and (maybe) C-frame masks */
+ hw->hw_info2 &= cpu_to_hc32(fotg210, ~(QH_CMASK | QH_SMASK));
+ hw->hw_info2 |= qh->period
+ ? cpu_to_hc32(fotg210, 1 << uframe)
+ : cpu_to_hc32(fotg210, QH_SMASK);
+ hw->hw_info2 |= c_mask;
+ } else
+ fotg210_dbg(fotg210, "reused qh %p schedule\n", qh);
+
+ /* stuff into the periodic schedule */
+ qh_link_periodic(fotg210, qh);
+done:
+ return status;
+}
+
+static int intr_submit(
+ struct fotg210_hcd *fotg210,
+ struct urb *urb,
+ struct list_head *qtd_list,
+ gfp_t mem_flags
+) {
+ unsigned epnum;
+ unsigned long flags;
+ struct fotg210_qh *qh;
+ int status;
+ struct list_head empty;
+
+ /* get endpoint and transfer/schedule data */
+ epnum = urb->ep->desc.bEndpointAddress;
+
+ spin_lock_irqsave(&fotg210->lock, flags);
+
+ if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) {
+ status = -ESHUTDOWN;
+ goto done_not_linked;
+ }
+ status = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb);
+ if (unlikely(status))
+ goto done_not_linked;
+
+ /* get qh and force any scheduling errors */
+ INIT_LIST_HEAD(&empty);
+ qh = qh_append_tds(fotg210, urb, &empty, epnum, &urb->ep->hcpriv);
+ if (qh == NULL) {
+ status = -ENOMEM;
+ goto done;
+ }
+ if (qh->qh_state == QH_STATE_IDLE) {
+ status = qh_schedule(fotg210, qh);
+ if (status)
+ goto done;
+ }
+
+ /* then queue the urb's tds to the qh */
+ qh = qh_append_tds(fotg210, urb, qtd_list, epnum, &urb->ep->hcpriv);
+ BUG_ON(qh == NULL);
+
+ /* ... update usbfs periodic stats */
+ fotg210_to_hcd(fotg210)->self.bandwidth_int_reqs++;
+
+done:
+ if (unlikely(status))
+ usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb);
+done_not_linked:
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ if (status)
+ qtd_list_free(fotg210, urb, qtd_list);
+
+ return status;
+}
+
+static void scan_intr(struct fotg210_hcd *fotg210)
+{
+ struct fotg210_qh *qh;
+
+ list_for_each_entry_safe(qh, fotg210->qh_scan_next,
+ &fotg210->intr_qh_list, intr_node) {
+ rescan:
+ /* clean any finished work for this qh */
+ if (!list_empty(&qh->qtd_list)) {
+ int temp;
+
+ /*
+ * Unlinks could happen here; completion reporting
+ * drops the lock. That's why fotg210->qh_scan_next
+ * always holds the next qh to scan; if the next qh
+ * gets unlinked then fotg210->qh_scan_next is adjusted
+ * in qh_unlink_periodic().
+ */
+ temp = qh_completions(fotg210, qh);
+ if (unlikely(qh->needs_rescan ||
+ (list_empty(&qh->qtd_list) &&
+ qh->qh_state == QH_STATE_LINKED)))
+ start_unlink_intr(fotg210, qh);
+ else if (temp != 0)
+ goto rescan;
+ }
+ }
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* fotg210_iso_stream ops work with both ITD and SITD */
+
+static struct fotg210_iso_stream *
+iso_stream_alloc(gfp_t mem_flags)
+{
+ struct fotg210_iso_stream *stream;
+
+ stream = kzalloc(sizeof(*stream), mem_flags);
+ if (likely(stream != NULL)) {
+ INIT_LIST_HEAD(&stream->td_list);
+ INIT_LIST_HEAD(&stream->free_list);
+ stream->next_uframe = -1;
+ }
+ return stream;
+}
+
+static void
+iso_stream_init(
+ struct fotg210_hcd *fotg210,
+ struct fotg210_iso_stream *stream,
+ struct usb_device *dev,
+ int pipe,
+ unsigned interval
+)
+{
+ u32 buf1;
+ unsigned epnum, maxp;
+ int is_input;
+ long bandwidth;
+ unsigned multi;
+
+ /*
+ * this might be a "high bandwidth" highspeed endpoint,
+ * as encoded in the ep descriptor's wMaxPacket field
+ */
+ epnum = usb_pipeendpoint(pipe);
+ is_input = usb_pipein(pipe) ? USB_DIR_IN : 0;
+ maxp = usb_maxpacket(dev, pipe, !is_input);
+ if (is_input)
+ buf1 = (1 << 11);
+ else
+ buf1 = 0;
+
+ maxp = max_packet(maxp);
+ multi = hb_mult(maxp);
+ buf1 |= maxp;
+ maxp *= multi;
+
+ stream->buf0 = cpu_to_hc32(fotg210, (epnum << 8) | dev->devnum);
+ stream->buf1 = cpu_to_hc32(fotg210, buf1);
+ stream->buf2 = cpu_to_hc32(fotg210, multi);
+
+ /* usbfs wants to report the average usecs per frame tied up
+ * when transfers on this endpoint are scheduled ...
+ */
+ if (dev->speed == USB_SPEED_FULL) {
+ interval <<= 3;
+ stream->usecs = NS_TO_US(usb_calc_bus_time(dev->speed,
+ is_input, 1, maxp));
+ stream->usecs /= 8;
+ } else {
+ stream->highspeed = 1;
+ stream->usecs = HS_USECS_ISO(maxp);
+ }
+ bandwidth = stream->usecs * 8;
+ bandwidth /= interval;
+
+ stream->bandwidth = bandwidth;
+ stream->udev = dev;
+ stream->bEndpointAddress = is_input | epnum;
+ stream->interval = interval;
+ stream->maxp = maxp;
+}
+
+static struct fotg210_iso_stream *
+iso_stream_find(struct fotg210_hcd *fotg210, struct urb *urb)
+{
+ unsigned epnum;
+ struct fotg210_iso_stream *stream;
+ struct usb_host_endpoint *ep;
+ unsigned long flags;
+
+ epnum = usb_pipeendpoint(urb->pipe);
+ if (usb_pipein(urb->pipe))
+ ep = urb->dev->ep_in[epnum];
+ else
+ ep = urb->dev->ep_out[epnum];
+
+ spin_lock_irqsave(&fotg210->lock, flags);
+ stream = ep->hcpriv;
+
+ if (unlikely(stream == NULL)) {
+ stream = iso_stream_alloc(GFP_ATOMIC);
+ if (likely(stream != NULL)) {
+ ep->hcpriv = stream;
+ stream->ep = ep;
+ iso_stream_init(fotg210, stream, urb->dev, urb->pipe,
+ urb->interval);
+ }
+
+ /* if dev->ep[epnum] is a QH, hw is set */
+ } else if (unlikely(stream->hw != NULL)) {
+ fotg210_dbg(fotg210, "dev %s ep%d%s, not iso??\n",
+ urb->dev->devpath, epnum,
+ usb_pipein(urb->pipe) ? "in" : "out");
+ stream = NULL;
+ }
+
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ return stream;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* fotg210_iso_sched ops can be ITD-only or SITD-only */
+
+static struct fotg210_iso_sched *
+iso_sched_alloc(unsigned packets, gfp_t mem_flags)
+{
+ struct fotg210_iso_sched *iso_sched;
+ int size = sizeof(*iso_sched);
+
+ size += packets * sizeof(struct fotg210_iso_packet);
+ iso_sched = kzalloc(size, mem_flags);
+ if (likely(iso_sched != NULL))
+ INIT_LIST_HEAD(&iso_sched->td_list);
+
+ return iso_sched;
+}
+
+static inline void
+itd_sched_init(
+ struct fotg210_hcd *fotg210,
+ struct fotg210_iso_sched *iso_sched,
+ struct fotg210_iso_stream *stream,
+ struct urb *urb
+)
+{
+ unsigned i;
+ dma_addr_t dma = urb->transfer_dma;
+
+ /* how many uframes are needed for these transfers */
+ iso_sched->span = urb->number_of_packets * stream->interval;
+
+ /* figure out per-uframe itd fields that we'll need later
+ * when we fit new itds into the schedule.
+ */
+ for (i = 0; i < urb->number_of_packets; i++) {
+ struct fotg210_iso_packet *uframe = &iso_sched->packet[i];
+ unsigned length;
+ dma_addr_t buf;
+ u32 trans;
+
+ length = urb->iso_frame_desc[i].length;
+ buf = dma + urb->iso_frame_desc[i].offset;
+
+ trans = FOTG210_ISOC_ACTIVE;
+ trans |= buf & 0x0fff;
+ if (unlikely(((i + 1) == urb->number_of_packets))
+ && !(urb->transfer_flags & URB_NO_INTERRUPT))
+ trans |= FOTG210_ITD_IOC;
+ trans |= length << 16;
+ uframe->transaction = cpu_to_hc32(fotg210, trans);
+
+ /* might need to cross a buffer page within a uframe */
+ uframe->bufp = (buf & ~(u64)0x0fff);
+ buf += length;
+ if (unlikely((uframe->bufp != (buf & ~(u64)0x0fff))))
+ uframe->cross = 1;
+ }
+}
+
+static void
+iso_sched_free(
+ struct fotg210_iso_stream *stream,
+ struct fotg210_iso_sched *iso_sched
+)
+{
+ if (!iso_sched)
+ return;
+ /* caller must hold fotg210->lock!*/
+ list_splice(&iso_sched->td_list, &stream->free_list);
+ kfree(iso_sched);
+}
+
+static int
+itd_urb_transaction(
+ struct fotg210_iso_stream *stream,
+ struct fotg210_hcd *fotg210,
+ struct urb *urb,
+ gfp_t mem_flags
+)
+{
+ struct fotg210_itd *itd;
+ dma_addr_t itd_dma;
+ int i;
+ unsigned num_itds;
+ struct fotg210_iso_sched *sched;
+ unsigned long flags;
+
+ sched = iso_sched_alloc(urb->number_of_packets, mem_flags);
+ if (unlikely(sched == NULL))
+ return -ENOMEM;
+
+ itd_sched_init(fotg210, sched, stream, urb);
+
+ if (urb->interval < 8)
+ num_itds = 1 + (sched->span + 7) / 8;
+ else
+ num_itds = urb->number_of_packets;
+
+ /* allocate/init ITDs */
+ spin_lock_irqsave(&fotg210->lock, flags);
+ for (i = 0; i < num_itds; i++) {
+
+ /*
+ * Use iTDs from the free list, but not iTDs that may
+ * still be in use by the hardware.
+ */
+ if (likely(!list_empty(&stream->free_list))) {
+ itd = list_first_entry(&stream->free_list,
+ struct fotg210_itd, itd_list);
+ if (itd->frame == fotg210->now_frame)
+ goto alloc_itd;
+ list_del(&itd->itd_list);
+ itd_dma = itd->itd_dma;
+ } else {
+ alloc_itd:
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ itd = dma_pool_alloc(fotg210->itd_pool, mem_flags,
+ &itd_dma);
+ spin_lock_irqsave(&fotg210->lock, flags);
+ if (!itd) {
+ iso_sched_free(stream, sched);
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ return -ENOMEM;
+ }
+ }
+
+ memset(itd, 0, sizeof(*itd));
+ itd->itd_dma = itd_dma;
+ list_add(&itd->itd_list, &sched->td_list);
+ }
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+
+ /* temporarily store schedule info in hcpriv */
+ urb->hcpriv = sched;
+ urb->error_count = 0;
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static inline int
+itd_slot_ok(
+ struct fotg210_hcd *fotg210,
+ u32 mod,
+ u32 uframe,
+ u8 usecs,
+ u32 period
+)
+{
+ uframe %= period;
+ do {
+ /* can't commit more than uframe_periodic_max usec */
+ if (periodic_usecs(fotg210, uframe >> 3, uframe & 0x7)
+ > (fotg210->uframe_periodic_max - usecs))
+ return 0;
+
+ /* we know urb->interval is 2^N uframes */
+ uframe += period;
+ } while (uframe < mod);
+ return 1;
+}
+
+/*
+ * This scheduler plans almost as far into the future as it has actual
+ * periodic schedule slots. (Affected by TUNE_FLS, which defaults to
+ * "as small as possible" to be cache-friendlier.) That limits the size
+ * transfers you can stream reliably; avoid more than 64 msec per urb.
+ * Also avoid queue depths of less than fotg210's worst irq latency (affected
+ * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter,
+ * and other factors); or more than about 230 msec total (for portability,
+ * given FOTG210_TUNE_FLS and the slop). Or, write a smarter scheduler!
+ */
+
+#define SCHEDULE_SLOP 80 /* microframes */
+
+static int
+iso_stream_schedule(
+ struct fotg210_hcd *fotg210,
+ struct urb *urb,
+ struct fotg210_iso_stream *stream
+)
+{
+ u32 now, next, start, period, span;
+ int status;
+ unsigned mod = fotg210->periodic_size << 3;
+ struct fotg210_iso_sched *sched = urb->hcpriv;
+
+ period = urb->interval;
+ span = sched->span;
+
+ if (span > mod - SCHEDULE_SLOP) {
+ fotg210_dbg(fotg210, "iso request %p too long\n", urb);
+ status = -EFBIG;
+ goto fail;
+ }
+
+ now = fotg210_read_frame_index(fotg210) & (mod - 1);
+
+ /* Typical case: reuse current schedule, stream is still active.
+ * Hopefully there are no gaps from the host falling behind
+ * (irq delays etc), but if there are we'll take the next
+ * slot in the schedule, implicitly assuming URB_ISO_ASAP.
+ */
+ if (likely(!list_empty(&stream->td_list))) {
+ u32 excess;
+
+ /* For high speed devices, allow scheduling within the
+ * isochronous scheduling threshold. For full speed devices
+ * and Intel PCI-based controllers, don't (work around for
+ * Intel ICH9 bug).
+ */
+ if (!stream->highspeed && fotg210->fs_i_thresh)
+ next = now + fotg210->i_thresh;
+ else
+ next = now;
+
+ /* Fell behind (by up to twice the slop amount)?
+ * We decide based on the time of the last currently-scheduled
+ * slot, not the time of the next available slot.
+ */
+ excess = (stream->next_uframe - period - next) & (mod - 1);
+ if (excess >= mod - 2 * SCHEDULE_SLOP)
+ start = next + excess - mod + period *
+ DIV_ROUND_UP(mod - excess, period);
+ else
+ start = next + excess + period;
+ if (start - now >= mod) {
+ fotg210_dbg(fotg210, "request %p would overflow (%d+%d >= %d)\n",
+ urb, start - now - period, period,
+ mod);
+ status = -EFBIG;
+ goto fail;
+ }
+ }
+
+ /* need to schedule; when's the next (u)frame we could start?
+ * this is bigger than fotg210->i_thresh allows; scheduling itself
+ * isn't free, the slop should handle reasonably slow cpus. it
+ * can also help high bandwidth if the dma and irq loads don't
+ * jump until after the queue is primed.
+ */
+ else {
+ int done = 0;
+ start = SCHEDULE_SLOP + (now & ~0x07);
+
+ /* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */
+
+ /* find a uframe slot with enough bandwidth.
+ * Early uframes are more precious because full-speed
+ * iso IN transfers can't use late uframes,
+ * and therefore they should be allocated last.
+ */
+ next = start;
+ start += period;
+ do {
+ start--;
+ /* check schedule: enough space? */
+ if (itd_slot_ok(fotg210, mod, start,
+ stream->usecs, period))
+ done = 1;
+ } while (start > next && !done);
+
+ /* no room in the schedule */
+ if (!done) {
+ fotg210_dbg(fotg210, "iso resched full %p (now %d max %d)\n",
+ urb, now, now + mod);
+ status = -ENOSPC;
+ goto fail;
+ }
+ }
+
+ /* Tried to schedule too far into the future? */
+ if (unlikely(start - now + span - period
+ >= mod - 2 * SCHEDULE_SLOP)) {
+ fotg210_dbg(fotg210, "request %p would overflow (%d+%d >= %d)\n",
+ urb, start - now, span - period,
+ mod - 2 * SCHEDULE_SLOP);
+ status = -EFBIG;
+ goto fail;
+ }
+
+ stream->next_uframe = start & (mod - 1);
+
+ /* report high speed start in uframes; full speed, in frames */
+ urb->start_frame = stream->next_uframe;
+ if (!stream->highspeed)
+ urb->start_frame >>= 3;
+
+ /* Make sure scan_isoc() sees these */
+ if (fotg210->isoc_count == 0)
+ fotg210->next_frame = now >> 3;
+ return 0;
+
+ fail:
+ iso_sched_free(stream, sched);
+ urb->hcpriv = NULL;
+ return status;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static inline void
+itd_init(struct fotg210_hcd *fotg210, struct fotg210_iso_stream *stream,
+ struct fotg210_itd *itd)
+{
+ int i;
+
+ /* it's been recently zeroed */
+ itd->hw_next = FOTG210_LIST_END(fotg210);
+ itd->hw_bufp[0] = stream->buf0;
+ itd->hw_bufp[1] = stream->buf1;
+ itd->hw_bufp[2] = stream->buf2;
+
+ for (i = 0; i < 8; i++)
+ itd->index[i] = -1;
+
+ /* All other fields are filled when scheduling */
+}
+
+static inline void
+itd_patch(
+ struct fotg210_hcd *fotg210,
+ struct fotg210_itd *itd,
+ struct fotg210_iso_sched *iso_sched,
+ unsigned index,
+ u16 uframe
+)
+{
+ struct fotg210_iso_packet *uf = &iso_sched->packet[index];
+ unsigned pg = itd->pg;
+
+ uframe &= 0x07;
+ itd->index[uframe] = index;
+
+ itd->hw_transaction[uframe] = uf->transaction;
+ itd->hw_transaction[uframe] |= cpu_to_hc32(fotg210, pg << 12);
+ itd->hw_bufp[pg] |= cpu_to_hc32(fotg210, uf->bufp & ~(u32)0);
+ itd->hw_bufp_hi[pg] |= cpu_to_hc32(fotg210, (u32)(uf->bufp >> 32));
+
+ /* iso_frame_desc[].offset must be strictly increasing */
+ if (unlikely(uf->cross)) {
+ u64 bufp = uf->bufp + 4096;
+
+ itd->pg = ++pg;
+ itd->hw_bufp[pg] |= cpu_to_hc32(fotg210, bufp & ~(u32)0);
+ itd->hw_bufp_hi[pg] |= cpu_to_hc32(fotg210, (u32)(bufp >> 32));
+ }
+}
+
+static inline void
+itd_link(struct fotg210_hcd *fotg210, unsigned frame, struct fotg210_itd *itd)
+{
+ union fotg210_shadow *prev = &fotg210->pshadow[frame];
+ __hc32 *hw_p = &fotg210->periodic[frame];
+ union fotg210_shadow here = *prev;
+ __hc32 type = 0;
+
+ /* skip any iso nodes which might belong to previous microframes */
+ while (here.ptr) {
+ type = Q_NEXT_TYPE(fotg210, *hw_p);
+ if (type == cpu_to_hc32(fotg210, Q_TYPE_QH))
+ break;
+ prev = periodic_next_shadow(fotg210, prev, type);
+ hw_p = shadow_next_periodic(fotg210, &here, type);
+ here = *prev;
+ }
+
+ itd->itd_next = here;
+ itd->hw_next = *hw_p;
+ prev->itd = itd;
+ itd->frame = frame;
+ wmb();
+ *hw_p = cpu_to_hc32(fotg210, itd->itd_dma | Q_TYPE_ITD);
+}
+
+/* fit urb's itds into the selected schedule slot; activate as needed */
+static void itd_link_urb(
+ struct fotg210_hcd *fotg210,
+ struct urb *urb,
+ unsigned mod,
+ struct fotg210_iso_stream *stream
+)
+{
+ int packet;
+ unsigned next_uframe, uframe, frame;
+ struct fotg210_iso_sched *iso_sched = urb->hcpriv;
+ struct fotg210_itd *itd;
+
+ next_uframe = stream->next_uframe & (mod - 1);
+
+ if (unlikely(list_empty(&stream->td_list))) {
+ fotg210_to_hcd(fotg210)->self.bandwidth_allocated
+ += stream->bandwidth;
+ fotg210_dbg(fotg210,
+ "schedule devp %s ep%d%s-iso period %d start %d.%d\n",
+ urb->dev->devpath, stream->bEndpointAddress & 0x0f,
+ (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
+ urb->interval,
+ next_uframe >> 3, next_uframe & 0x7);
+ }
+
+ /* fill iTDs uframe by uframe */
+ for (packet = 0, itd = NULL; packet < urb->number_of_packets;) {
+ if (itd == NULL) {
+ /* ASSERT: we have all necessary itds */
+
+ /* ASSERT: no itds for this endpoint in this uframe */
+
+ itd = list_entry(iso_sched->td_list.next,
+ struct fotg210_itd, itd_list);
+ list_move_tail(&itd->itd_list, &stream->td_list);
+ itd->stream = stream;
+ itd->urb = urb;
+ itd_init(fotg210, stream, itd);
+ }
+
+ uframe = next_uframe & 0x07;
+ frame = next_uframe >> 3;
+
+ itd_patch(fotg210, itd, iso_sched, packet, uframe);
+
+ next_uframe += stream->interval;
+ next_uframe &= mod - 1;
+ packet++;
+
+ /* link completed itds into the schedule */
+ if (((next_uframe >> 3) != frame)
+ || packet == urb->number_of_packets) {
+ itd_link(fotg210, frame & (fotg210->periodic_size - 1),
+ itd);
+ itd = NULL;
+ }
+ }
+ stream->next_uframe = next_uframe;
+
+ /* don't need that schedule data any more */
+ iso_sched_free(stream, iso_sched);
+ urb->hcpriv = NULL;
+
+ ++fotg210->isoc_count;
+ enable_periodic(fotg210);
+}
+
+#define ISO_ERRS (FOTG210_ISOC_BUF_ERR | FOTG210_ISOC_BABBLE |\
+ FOTG210_ISOC_XACTERR)
+
+/* Process and recycle a completed ITD. Return true iff its urb completed,
+ * and hence its completion callback probably added things to the hardware
+ * schedule.
+ *
+ * Note that we carefully avoid recycling this descriptor until after any
+ * completion callback runs, so that it won't be reused quickly. That is,
+ * assuming (a) no more than two urbs per frame on this endpoint, and also
+ * (b) only this endpoint's completions submit URBs. It seems some silicon
+ * corrupts things if you reuse completed descriptors very quickly...
+ */
+static bool itd_complete(struct fotg210_hcd *fotg210, struct fotg210_itd *itd)
+{
+ struct urb *urb = itd->urb;
+ struct usb_iso_packet_descriptor *desc;
+ u32 t;
+ unsigned uframe;
+ int urb_index = -1;
+ struct fotg210_iso_stream *stream = itd->stream;
+ struct usb_device *dev;
+ bool retval = false;
+
+ /* for each uframe with a packet */
+ for (uframe = 0; uframe < 8; uframe++) {
+ if (likely(itd->index[uframe] == -1))
+ continue;
+ urb_index = itd->index[uframe];
+ desc = &urb->iso_frame_desc[urb_index];
+
+ t = hc32_to_cpup(fotg210, &itd->hw_transaction[uframe]);
+ itd->hw_transaction[uframe] = 0;
+
+ /* report transfer status */
+ if (unlikely(t & ISO_ERRS)) {
+ urb->error_count++;
+ if (t & FOTG210_ISOC_BUF_ERR)
+ desc->status = usb_pipein(urb->pipe)
+ ? -ENOSR /* hc couldn't read */
+ : -ECOMM; /* hc couldn't write */
+ else if (t & FOTG210_ISOC_BABBLE)
+ desc->status = -EOVERFLOW;
+ else /* (t & FOTG210_ISOC_XACTERR) */
+ desc->status = -EPROTO;
+
+ /* HC need not update length with this error */
+ if (!(t & FOTG210_ISOC_BABBLE)) {
+ desc->actual_length =
+ fotg210_itdlen(urb, desc, t);
+ urb->actual_length += desc->actual_length;
+ }
+ } else if (likely((t & FOTG210_ISOC_ACTIVE) == 0)) {
+ desc->status = 0;
+ desc->actual_length = fotg210_itdlen(urb, desc, t);
+ urb->actual_length += desc->actual_length;
+ } else {
+ /* URB was too late */
+ desc->status = -EXDEV;
+ }
+ }
+
+ /* handle completion now? */
+ if (likely((urb_index + 1) != urb->number_of_packets))
+ goto done;
+
+ /* ASSERT: it's really the last itd for this urb
+ list_for_each_entry (itd, &stream->td_list, itd_list)
+ BUG_ON (itd->urb == urb);
+ */
+
+ /* give urb back to the driver; completion often (re)submits */
+ dev = urb->dev;
+ fotg210_urb_done(fotg210, urb, 0);
+ retval = true;
+ urb = NULL;
+
+ --fotg210->isoc_count;
+ disable_periodic(fotg210);
+
+ if (unlikely(list_is_singular(&stream->td_list))) {
+ fotg210_to_hcd(fotg210)->self.bandwidth_allocated
+ -= stream->bandwidth;
+ fotg210_dbg(fotg210,
+ "deschedule devp %s ep%d%s-iso\n",
+ dev->devpath, stream->bEndpointAddress & 0x0f,
+ (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
+ }
+
+done:
+ itd->urb = NULL;
+
+ /* Add to the end of the free list for later reuse */
+ list_move_tail(&itd->itd_list, &stream->free_list);
+
+ /* Recycle the iTDs when the pipeline is empty (ep no longer in use) */
+ if (list_empty(&stream->td_list)) {
+ list_splice_tail_init(&stream->free_list,
+ &fotg210->cached_itd_list);
+ start_free_itds(fotg210);
+ }
+
+ return retval;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int itd_submit(struct fotg210_hcd *fotg210, struct urb *urb,
+ gfp_t mem_flags)
+{
+ int status = -EINVAL;
+ unsigned long flags;
+ struct fotg210_iso_stream *stream;
+
+ /* Get iso_stream head */
+ stream = iso_stream_find(fotg210, urb);
+ if (unlikely(stream == NULL)) {
+ fotg210_dbg(fotg210, "can't get iso stream\n");
+ return -ENOMEM;
+ }
+ if (unlikely(urb->interval != stream->interval &&
+ fotg210_port_speed(fotg210, 0) ==
+ USB_PORT_STAT_HIGH_SPEED)) {
+ fotg210_dbg(fotg210, "can't change iso interval %d --> %d\n",
+ stream->interval, urb->interval);
+ goto done;
+ }
+
+#ifdef FOTG210_URB_TRACE
+ fotg210_dbg(fotg210,
+ "%s %s urb %p ep%d%s len %d, %d pkts %d uframes[%p]\n",
+ __func__, urb->dev->devpath, urb,
+ usb_pipeendpoint(urb->pipe),
+ usb_pipein(urb->pipe) ? "in" : "out",
+ urb->transfer_buffer_length,
+ urb->number_of_packets, urb->interval,
+ stream);
+#endif
+
+ /* allocate ITDs w/o locking anything */
+ status = itd_urb_transaction(stream, fotg210, urb, mem_flags);
+ if (unlikely(status < 0)) {
+ fotg210_dbg(fotg210, "can't init itds\n");
+ goto done;
+ }
+
+ /* schedule ... need to lock */
+ spin_lock_irqsave(&fotg210->lock, flags);
+ if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) {
+ status = -ESHUTDOWN;
+ goto done_not_linked;
+ }
+ status = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb);
+ if (unlikely(status))
+ goto done_not_linked;
+ status = iso_stream_schedule(fotg210, urb, stream);
+ if (likely(status == 0))
+ itd_link_urb(fotg210, urb, fotg210->periodic_size << 3, stream);
+ else
+ usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb);
+ done_not_linked:
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ done:
+ return status;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void scan_isoc(struct fotg210_hcd *fotg210)
+{
+ unsigned uf, now_frame, frame;
+ unsigned fmask = fotg210->periodic_size - 1;
+ bool modified, live;
+
+ /*
+ * When running, scan from last scan point up to "now"
+ * else clean up by scanning everything that's left.
+ * Touches as few pages as possible: cache-friendly.
+ */
+ if (fotg210->rh_state >= FOTG210_RH_RUNNING) {
+ uf = fotg210_read_frame_index(fotg210);
+ now_frame = (uf >> 3) & fmask;
+ live = true;
+ } else {
+ now_frame = (fotg210->next_frame - 1) & fmask;
+ live = false;
+ }
+ fotg210->now_frame = now_frame;
+
+ frame = fotg210->next_frame;
+ for (;;) {
+ union fotg210_shadow q, *q_p;
+ __hc32 type, *hw_p;
+
+restart:
+ /* scan each element in frame's queue for completions */
+ q_p = &fotg210->pshadow[frame];
+ hw_p = &fotg210->periodic[frame];
+ q.ptr = q_p->ptr;
+ type = Q_NEXT_TYPE(fotg210, *hw_p);
+ modified = false;
+
+ while (q.ptr != NULL) {
+ switch (hc32_to_cpu(fotg210, type)) {
+ case Q_TYPE_ITD:
+ /* If this ITD is still active, leave it for
+ * later processing ... check the next entry.
+ * No need to check for activity unless the
+ * frame is current.
+ */
+ if (frame == now_frame && live) {
+ rmb();
+ for (uf = 0; uf < 8; uf++) {
+ if (q.itd->hw_transaction[uf] &
+ ITD_ACTIVE(fotg210))
+ break;
+ }
+ if (uf < 8) {
+ q_p = &q.itd->itd_next;
+ hw_p = &q.itd->hw_next;
+ type = Q_NEXT_TYPE(fotg210,
+ q.itd->hw_next);
+ q = *q_p;
+ break;
+ }
+ }
+
+ /* Take finished ITDs out of the schedule
+ * and process them: recycle, maybe report
+ * URB completion. HC won't cache the
+ * pointer for much longer, if at all.
+ */
+ *q_p = q.itd->itd_next;
+ *hw_p = q.itd->hw_next;
+ type = Q_NEXT_TYPE(fotg210, q.itd->hw_next);
+ wmb();
+ modified = itd_complete(fotg210, q.itd);
+ q = *q_p;
+ break;
+ default:
+ fotg210_dbg(fotg210, "corrupt type %d frame %d shadow %p\n",
+ type, frame, q.ptr);
+ /* FALL THROUGH */
+ case Q_TYPE_QH:
+ case Q_TYPE_FSTN:
+ /* End of the iTDs and siTDs */
+ q.ptr = NULL;
+ break;
+ }
+
+ /* assume completion callbacks modify the queue */
+ if (unlikely(modified && fotg210->isoc_count > 0))
+ goto restart;
+ }
+
+ /* Stop when we have reached the current frame */
+ if (frame == now_frame)
+ break;
+ frame = (frame + 1) & fmask;
+ }
+ fotg210->next_frame = now_frame;
+}
+/*-------------------------------------------------------------------------*/
+/*
+ * Display / Set uframe_periodic_max
+ */
+static ssize_t show_uframe_periodic_max(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct fotg210_hcd *fotg210;
+ int n;
+
+ fotg210 = hcd_to_fotg210(bus_to_hcd(dev_get_drvdata(dev)));
+ n = scnprintf(buf, PAGE_SIZE, "%d\n", fotg210->uframe_periodic_max);
+ return n;
+}
+
+
+static ssize_t store_uframe_periodic_max(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct fotg210_hcd *fotg210;
+ unsigned uframe_periodic_max;
+ unsigned frame, uframe;
+ unsigned short allocated_max;
+ unsigned long flags;
+ ssize_t ret;
+
+ fotg210 = hcd_to_fotg210(bus_to_hcd(dev_get_drvdata(dev)));
+ if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
+ return -EINVAL;
+
+ if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
+ fotg210_info(fotg210, "rejecting invalid request for uframe_periodic_max=%u\n",
+ uframe_periodic_max);
+ return -EINVAL;
+ }
+
+ ret = -EINVAL;
+
+ /*
+ * lock, so that our checking does not race with possible periodic
+ * bandwidth allocation through submitting new urbs.
+ */
+ spin_lock_irqsave(&fotg210->lock, flags);
+
+ /*
+ * for request to decrease max periodic bandwidth, we have to check
+ * every microframe in the schedule to see whether the decrease is
+ * possible.
+ */
+ if (uframe_periodic_max < fotg210->uframe_periodic_max) {
+ allocated_max = 0;
+
+ for (frame = 0; frame < fotg210->periodic_size; ++frame)
+ for (uframe = 0; uframe < 7; ++uframe)
+ allocated_max = max(allocated_max,
+ periodic_usecs(fotg210, frame, uframe));
+
+ if (allocated_max > uframe_periodic_max) {
+ fotg210_info(fotg210,
+ "cannot decrease uframe_periodic_max because "
+ "periodic bandwidth is already allocated "
+ "(%u > %u)\n",
+ allocated_max, uframe_periodic_max);
+ goto out_unlock;
+ }
+ }
+
+ /* increasing is always ok */
+
+ fotg210_info(fotg210, "setting max periodic bandwidth to %u%% (== %u usec/uframe)\n",
+ 100 * uframe_periodic_max/125, uframe_periodic_max);
+
+ if (uframe_periodic_max != 100)
+ fotg210_warn(fotg210, "max periodic bandwidth set is non-standard\n");
+
+ fotg210->uframe_periodic_max = uframe_periodic_max;
+ ret = count;
+
+out_unlock:
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ return ret;
+}
+
+static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max,
+ store_uframe_periodic_max);
+
+static inline int create_sysfs_files(struct fotg210_hcd *fotg210)
+{
+ struct device *controller = fotg210_to_hcd(fotg210)->self.controller;
+ int i = 0;
+
+ if (i)
+ goto out;
+
+ i = device_create_file(controller, &dev_attr_uframe_periodic_max);
+out:
+ return i;
+}
+
+static inline void remove_sysfs_files(struct fotg210_hcd *fotg210)
+{
+ struct device *controller = fotg210_to_hcd(fotg210)->self.controller;
+
+ device_remove_file(controller, &dev_attr_uframe_periodic_max);
+}
+/*-------------------------------------------------------------------------*/
+
+/* On some systems, leaving remote wakeup enabled prevents system shutdown.
+ * The firmware seems to think that powering off is a wakeup event!
+ * This routine turns off remote wakeup and everything else, on all ports.
+ */
+static void fotg210_turn_off_all_ports(struct fotg210_hcd *fotg210)
+{
+ u32 __iomem *status_reg = &fotg210->regs->port_status;
+
+ fotg210_writel(fotg210, PORT_RWC_BITS, status_reg);
+}
+
+/*
+ * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
+ * Must be called with interrupts enabled and the lock not held.
+ */
+static void fotg210_silence_controller(struct fotg210_hcd *fotg210)
+{
+ fotg210_halt(fotg210);
+
+ spin_lock_irq(&fotg210->lock);
+ fotg210->rh_state = FOTG210_RH_HALTED;
+ fotg210_turn_off_all_ports(fotg210);
+ spin_unlock_irq(&fotg210->lock);
+}
+
+/* fotg210_shutdown kick in for silicon on any bus (not just pci, etc).
+ * This forcibly disables dma and IRQs, helping kexec and other cases
+ * where the next system software may expect clean state.
+ */
+static void fotg210_shutdown(struct usb_hcd *hcd)
+{
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+
+ spin_lock_irq(&fotg210->lock);
+ fotg210->shutdown = true;
+ fotg210->rh_state = FOTG210_RH_STOPPING;
+ fotg210->enabled_hrtimer_events = 0;
+ spin_unlock_irq(&fotg210->lock);
+
+ fotg210_silence_controller(fotg210);
+
+ hrtimer_cancel(&fotg210->hrtimer);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * fotg210_work is called from some interrupts, timers, and so on.
+ * it calls driver completion functions, after dropping fotg210->lock.
+ */
+static void fotg210_work(struct fotg210_hcd *fotg210)
+{
+ /* another CPU may drop fotg210->lock during a schedule scan while
+ * it reports urb completions. this flag guards against bogus
+ * attempts at re-entrant schedule scanning.
+ */
+ if (fotg210->scanning) {
+ fotg210->need_rescan = true;
+ return;
+ }
+ fotg210->scanning = true;
+
+ rescan:
+ fotg210->need_rescan = false;
+ if (fotg210->async_count)
+ scan_async(fotg210);
+ if (fotg210->intr_count > 0)
+ scan_intr(fotg210);
+ if (fotg210->isoc_count > 0)
+ scan_isoc(fotg210);
+ if (fotg210->need_rescan)
+ goto rescan;
+ fotg210->scanning = false;
+
+ /* the IO watchdog guards against hardware or driver bugs that
+ * misplace IRQs, and should let us run completely without IRQs.
+ * such lossage has been observed on both VT6202 and VT8235.
+ */
+ turn_on_io_watchdog(fotg210);
+}
+
+/*
+ * Called when the fotg210_hcd module is removed.
+ */
+static void fotg210_stop(struct usb_hcd *hcd)
+{
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+
+ fotg210_dbg(fotg210, "stop\n");
+
+ /* no more interrupts ... */
+
+ spin_lock_irq(&fotg210->lock);
+ fotg210->enabled_hrtimer_events = 0;
+ spin_unlock_irq(&fotg210->lock);
+
+ fotg210_quiesce(fotg210);
+ fotg210_silence_controller(fotg210);
+ fotg210_reset(fotg210);
+
+ hrtimer_cancel(&fotg210->hrtimer);
+ remove_sysfs_files(fotg210);
+ remove_debug_files(fotg210);
+
+ /* root hub is shut down separately (first, when possible) */
+ spin_lock_irq(&fotg210->lock);
+ end_free_itds(fotg210);
+ spin_unlock_irq(&fotg210->lock);
+ fotg210_mem_cleanup(fotg210);
+
+#ifdef FOTG210_STATS
+ fotg210_dbg(fotg210, "irq normal %ld err %ld iaa %ld (lost %ld)\n",
+ fotg210->stats.normal, fotg210->stats.error, fotg210->stats.iaa,
+ fotg210->stats.lost_iaa);
+ fotg210_dbg(fotg210, "complete %ld unlink %ld\n",
+ fotg210->stats.complete, fotg210->stats.unlink);
+#endif
+
+ dbg_status(fotg210, "fotg210_stop completed",
+ fotg210_readl(fotg210, &fotg210->regs->status));
+}
+
+/* one-time init, only for memory state */
+static int hcd_fotg210_init(struct usb_hcd *hcd)
+{
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+ u32 temp;
+ int retval;
+ u32 hcc_params;
+ struct fotg210_qh_hw *hw;
+
+ spin_lock_init(&fotg210->lock);
+
+ /*
+ * keep io watchdog by default, those good HCDs could turn off it later
+ */
+ fotg210->need_io_watchdog = 1;
+
+ hrtimer_init(&fotg210->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+ fotg210->hrtimer.function = fotg210_hrtimer_func;
+ fotg210->next_hrtimer_event = FOTG210_HRTIMER_NO_EVENT;
+
+ hcc_params = fotg210_readl(fotg210, &fotg210->caps->hcc_params);
+
+ /*
+ * by default set standard 80% (== 100 usec/uframe) max periodic
+ * bandwidth as required by USB 2.0
+ */
+ fotg210->uframe_periodic_max = 100;
+
+ /*
+ * hw default: 1K periodic list heads, one per frame.
+ * periodic_size can shrink by USBCMD update if hcc_params allows.
+ */
+ fotg210->periodic_size = DEFAULT_I_TDPS;
+ INIT_LIST_HEAD(&fotg210->intr_qh_list);
+ INIT_LIST_HEAD(&fotg210->cached_itd_list);
+
+ if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
+ /* periodic schedule size can be smaller than default */
+ switch (FOTG210_TUNE_FLS) {
+ case 0:
+ fotg210->periodic_size = 1024;
+ break;
+ case 1:
+ fotg210->periodic_size = 512;
+ break;
+ case 2:
+ fotg210->periodic_size = 256;
+ break;
+ default:
+ BUG();
+ }
+ }
+ retval = fotg210_mem_init(fotg210, GFP_KERNEL);
+ if (retval < 0)
+ return retval;
+
+ /* controllers may cache some of the periodic schedule ... */
+ fotg210->i_thresh = 2;
+
+ /*
+ * dedicate a qh for the async ring head, since we couldn't unlink
+ * a 'real' qh without stopping the async schedule [4.8]. use it
+ * as the 'reclamation list head' too.
+ * its dummy is used in hw_alt_next of many tds, to prevent the qh
+ * from automatically advancing to the next td after short reads.
+ */
+ fotg210->async->qh_next.qh = NULL;
+ hw = fotg210->async->hw;
+ hw->hw_next = QH_NEXT(fotg210, fotg210->async->qh_dma);
+ hw->hw_info1 = cpu_to_hc32(fotg210, QH_HEAD);
+ hw->hw_token = cpu_to_hc32(fotg210, QTD_STS_HALT);
+ hw->hw_qtd_next = FOTG210_LIST_END(fotg210);
+ fotg210->async->qh_state = QH_STATE_LINKED;
+ hw->hw_alt_next = QTD_NEXT(fotg210, fotg210->async->dummy->qtd_dma);
+
+ /* clear interrupt enables, set irq latency */
+ if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
+ log2_irq_thresh = 0;
+ temp = 1 << (16 + log2_irq_thresh);
+ if (HCC_CANPARK(hcc_params)) {
+ /* HW default park == 3, on hardware that supports it (like
+ * NVidia and ALI silicon), maximizes throughput on the async
+ * schedule by avoiding QH fetches between transfers.
+ *
+ * With fast usb storage devices and NForce2, "park" seems to
+ * make problems: throughput reduction (!), data errors...
+ */
+ if (park) {
+ park = min_t(unsigned, park, 3);
+ temp |= CMD_PARK;
+ temp |= park << 8;
+ }
+ fotg210_dbg(fotg210, "park %d\n", park);
+ }
+ if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
+ /* periodic schedule size can be smaller than default */
+ temp &= ~(3 << 2);
+ temp |= (FOTG210_TUNE_FLS << 2);
+ }
+ fotg210->command = temp;
+
+ /* Accept arbitrarily long scatter-gather lists */
+ if (!(hcd->driver->flags & HCD_LOCAL_MEM))
+ hcd->self.sg_tablesize = ~0;
+ return 0;
+}
+
+/* start HC running; it's halted, hcd_fotg210_init() has been run (once) */
+static int fotg210_run(struct usb_hcd *hcd)
+{
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+ u32 temp;
+ u32 hcc_params;
+
+ hcd->uses_new_polling = 1;
+
+ /* EHCI spec section 4.1 */
+
+ fotg210_writel(fotg210, fotg210->periodic_dma,
+ &fotg210->regs->frame_list);
+ fotg210_writel(fotg210, (u32)fotg210->async->qh_dma,
+ &fotg210->regs->async_next);
+
+ /*
+ * hcc_params controls whether fotg210->regs->segment must (!!!)
+ * be used; it constrains QH/ITD/SITD and QTD locations.
+ * pci_pool consistent memory always uses segment zero.
+ * streaming mappings for I/O buffers, like pci_map_single(),
+ * can return segments above 4GB, if the device allows.
+ *
+ * NOTE: the dma mask is visible through dma_supported(), so
+ * drivers can pass this info along ... like NETIF_F_HIGHDMA,
+ * Scsi_Host.highmem_io, and so forth. It's readonly to all
+ * host side drivers though.
+ */
+ hcc_params = fotg210_readl(fotg210, &fotg210->caps->hcc_params);
+
+ /*
+ * Philips, Intel, and maybe others need CMD_RUN before the
+ * root hub will detect new devices (why?); NEC doesn't
+ */
+ fotg210->command &= ~(CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
+ fotg210->command |= CMD_RUN;
+ fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
+ dbg_cmd(fotg210, "init", fotg210->command);
+
+ /*
+ * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
+ * are explicitly handed to companion controller(s), so no TT is
+ * involved with the root hub. (Except where one is integrated,
+ * and there's no companion controller unless maybe for USB OTG.)
+ *
+ * Turning on the CF flag will transfer ownership of all ports
+ * from the companions to the EHCI controller. If any of the
+ * companions are in the middle of a port reset at the time, it
+ * could cause trouble. Write-locking ehci_cf_port_reset_rwsem
+ * guarantees that no resets are in progress. After we set CF,
+ * a short delay lets the hardware catch up; new resets shouldn't
+ * be started before the port switching actions could complete.
+ */
+ down_write(&ehci_cf_port_reset_rwsem);
+ fotg210->rh_state = FOTG210_RH_RUNNING;
+ /* unblock posted writes */
+ fotg210_readl(fotg210, &fotg210->regs->command);
+ msleep(5);
+ up_write(&ehci_cf_port_reset_rwsem);
+ fotg210->last_periodic_enable = ktime_get_real();
+
+ temp = HC_VERSION(fotg210,
+ fotg210_readl(fotg210, &fotg210->caps->hc_capbase));
+ fotg210_info(fotg210,
+ "USB %x.%x started, EHCI %x.%02x\n",
+ ((fotg210->sbrn & 0xf0)>>4), (fotg210->sbrn & 0x0f),
+ temp >> 8, temp & 0xff);
+
+ fotg210_writel(fotg210, INTR_MASK,
+ &fotg210->regs->intr_enable); /* Turn On Interrupts */
+
+ /* GRR this is run-once init(), being done every time the HC starts.
+ * So long as they're part of class devices, we can't do it init()
+ * since the class device isn't created that early.
+ */
+ create_debug_files(fotg210);
+ create_sysfs_files(fotg210);
+
+ return 0;
+}
+
+static int fotg210_setup(struct usb_hcd *hcd)
+{
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+ int retval;
+
+ fotg210->regs = (void __iomem *)fotg210->caps +
+ HC_LENGTH(fotg210,
+ fotg210_readl(fotg210, &fotg210->caps->hc_capbase));
+ dbg_hcs_params(fotg210, "reset");
+ dbg_hcc_params(fotg210, "reset");
+
+ /* cache this readonly data; minimize chip reads */
+ fotg210->hcs_params = fotg210_readl(fotg210,
+ &fotg210->caps->hcs_params);
+
+ fotg210->sbrn = HCD_USB2;
+
+ /* data structure init */
+ retval = hcd_fotg210_init(hcd);
+ if (retval)
+ return retval;
+
+ retval = fotg210_halt(fotg210);
+ if (retval)
+ return retval;
+
+ fotg210_reset(fotg210);
+
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static irqreturn_t fotg210_irq(struct usb_hcd *hcd)
+{
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+ u32 status, masked_status, pcd_status = 0, cmd;
+ int bh;
+
+ spin_lock(&fotg210->lock);
+
+ status = fotg210_readl(fotg210, &fotg210->regs->status);
+
+ /* e.g. cardbus physical eject */
+ if (status == ~(u32) 0) {
+ fotg210_dbg(fotg210, "device removed\n");
+ goto dead;
+ }
+
+ /*
+ * We don't use STS_FLR, but some controllers don't like it to
+ * remain on, so mask it out along with the other status bits.
+ */
+ masked_status = status & (INTR_MASK | STS_FLR);
+
+ /* Shared IRQ? */
+ if (!masked_status ||
+ unlikely(fotg210->rh_state == FOTG210_RH_HALTED)) {
+ spin_unlock(&fotg210->lock);
+ return IRQ_NONE;
+ }
+
+ /* clear (just) interrupts */
+ fotg210_writel(fotg210, masked_status, &fotg210->regs->status);
+ cmd = fotg210_readl(fotg210, &fotg210->regs->command);
+ bh = 0;
+
+ /* unrequested/ignored: Frame List Rollover */
+ dbg_status(fotg210, "irq", status);
+
+ /* INT, ERR, and IAA interrupt rates can be throttled */
+
+ /* normal [4.15.1.2] or error [4.15.1.1] completion */
+ if (likely((status & (STS_INT|STS_ERR)) != 0)) {
+ if (likely((status & STS_ERR) == 0))
+ COUNT(fotg210->stats.normal);
+ else
+ COUNT(fotg210->stats.error);
+ bh = 1;
+ }
+
+ /* complete the unlinking of some qh [4.15.2.3] */
+ if (status & STS_IAA) {
+
+ /* Turn off the IAA watchdog */
+ fotg210->enabled_hrtimer_events &=
+ ~BIT(FOTG210_HRTIMER_IAA_WATCHDOG);
+
+ /*
+ * Mild optimization: Allow another IAAD to reset the
+ * hrtimer, if one occurs before the next expiration.
+ * In theory we could always cancel the hrtimer, but
+ * tests show that about half the time it will be reset
+ * for some other event anyway.
+ */
+ if (fotg210->next_hrtimer_event == FOTG210_HRTIMER_IAA_WATCHDOG)
+ ++fotg210->next_hrtimer_event;
+
+ /* guard against (alleged) silicon errata */
+ if (cmd & CMD_IAAD)
+ fotg210_dbg(fotg210, "IAA with IAAD still set?\n");
+ if (fotg210->async_iaa) {
+ COUNT(fotg210->stats.iaa);
+ end_unlink_async(fotg210);
+ } else
+ fotg210_dbg(fotg210, "IAA with nothing unlinked?\n");
+ }
+
+ /* remote wakeup [4.3.1] */
+ if (status & STS_PCD) {
+ int pstatus;
+ u32 __iomem *status_reg = &fotg210->regs->port_status;
+
+ /* kick root hub later */
+ pcd_status = status;
+
+ /* resume root hub? */
+ if (fotg210->rh_state == FOTG210_RH_SUSPENDED)
+ usb_hcd_resume_root_hub(hcd);
+
+ pstatus = fotg210_readl(fotg210, status_reg);
+
+ if (test_bit(0, &fotg210->suspended_ports) &&
+ ((pstatus & PORT_RESUME) ||
+ !(pstatus & PORT_SUSPEND)) &&
+ (pstatus & PORT_PE) &&
+ fotg210->reset_done[0] == 0) {
+
+ /* start 20 msec resume signaling from this port,
+ * and make hub_wq collect PORT_STAT_C_SUSPEND to
+ * stop that signaling. Use 5 ms extra for safety,
+ * like usb_port_resume() does.
+ */
+ fotg210->reset_done[0] = jiffies + msecs_to_jiffies(25);
+ set_bit(0, &fotg210->resuming_ports);
+ fotg210_dbg(fotg210, "port 1 remote wakeup\n");
+ mod_timer(&hcd->rh_timer, fotg210->reset_done[0]);
+ }
+ }
+
+ /* PCI errors [4.15.2.4] */
+ if (unlikely((status & STS_FATAL) != 0)) {
+ fotg210_err(fotg210, "fatal error\n");
+ dbg_cmd(fotg210, "fatal", cmd);
+ dbg_status(fotg210, "fatal", status);
+dead:
+ usb_hc_died(hcd);
+
+ /* Don't let the controller do anything more */
+ fotg210->shutdown = true;
+ fotg210->rh_state = FOTG210_RH_STOPPING;
+ fotg210->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
+ fotg210_writel(fotg210, fotg210->command,
+ &fotg210->regs->command);
+ fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable);
+ fotg210_handle_controller_death(fotg210);
+
+ /* Handle completions when the controller stops */
+ bh = 0;
+ }
+
+ if (bh)
+ fotg210_work(fotg210);
+ spin_unlock(&fotg210->lock);
+ if (pcd_status)
+ usb_hcd_poll_rh_status(hcd);
+ return IRQ_HANDLED;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * non-error returns are a promise to giveback() the urb later
+ * we drop ownership so next owner (or urb unlink) can get it
+ *
+ * urb + dev is in hcd.self.controller.urb_list
+ * we're queueing TDs onto software and hardware lists
+ *
+ * hcd-specific init for hcpriv hasn't been done yet
+ *
+ * NOTE: control, bulk, and interrupt share the same code to append TDs
+ * to a (possibly active) QH, and the same QH scanning code.
+ */
+static int fotg210_urb_enqueue(
+ struct usb_hcd *hcd,
+ struct urb *urb,
+ gfp_t mem_flags
+) {
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+ struct list_head qtd_list;
+
+ INIT_LIST_HEAD(&qtd_list);
+
+ switch (usb_pipetype(urb->pipe)) {
+ case PIPE_CONTROL:
+ /* qh_completions() code doesn't handle all the fault cases
+ * in multi-TD control transfers. Even 1KB is rare anyway.
+ */
+ if (urb->transfer_buffer_length > (16 * 1024))
+ return -EMSGSIZE;
+ /* FALLTHROUGH */
+ /* case PIPE_BULK: */
+ default:
+ if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags))
+ return -ENOMEM;
+ return submit_async(fotg210, urb, &qtd_list, mem_flags);
+
+ case PIPE_INTERRUPT:
+ if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags))
+ return -ENOMEM;
+ return intr_submit(fotg210, urb, &qtd_list, mem_flags);
+
+ case PIPE_ISOCHRONOUS:
+ return itd_submit(fotg210, urb, mem_flags);
+ }
+}
+
+/* remove from hardware lists
+ * completions normally happen asynchronously
+ */
+
+static int fotg210_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
+{
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+ struct fotg210_qh *qh;
+ unsigned long flags;
+ int rc;
+
+ spin_lock_irqsave(&fotg210->lock, flags);
+ rc = usb_hcd_check_unlink_urb(hcd, urb, status);
+ if (rc)
+ goto done;
+
+ switch (usb_pipetype(urb->pipe)) {
+ /* case PIPE_CONTROL: */
+ /* case PIPE_BULK:*/
+ default:
+ qh = (struct fotg210_qh *) urb->hcpriv;
+ if (!qh)
+ break;
+ switch (qh->qh_state) {
+ case QH_STATE_LINKED:
+ case QH_STATE_COMPLETING:
+ start_unlink_async(fotg210, qh);
+ break;
+ case QH_STATE_UNLINK:
+ case QH_STATE_UNLINK_WAIT:
+ /* already started */
+ break;
+ case QH_STATE_IDLE:
+ /* QH might be waiting for a Clear-TT-Buffer */
+ qh_completions(fotg210, qh);
+ break;
+ }
+ break;
+
+ case PIPE_INTERRUPT:
+ qh = (struct fotg210_qh *) urb->hcpriv;
+ if (!qh)
+ break;
+ switch (qh->qh_state) {
+ case QH_STATE_LINKED:
+ case QH_STATE_COMPLETING:
+ start_unlink_intr(fotg210, qh);
+ break;
+ case QH_STATE_IDLE:
+ qh_completions(fotg210, qh);
+ break;
+ default:
+ fotg210_dbg(fotg210, "bogus qh %p state %d\n",
+ qh, qh->qh_state);
+ goto done;
+ }
+ break;
+
+ case PIPE_ISOCHRONOUS:
+ /* itd... */
+
+ /* wait till next completion, do it then. */
+ /* completion irqs can wait up to 1024 msec, */
+ break;
+ }
+done:
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ return rc;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* bulk qh holds the data toggle */
+
+static void
+fotg210_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
+{
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+ unsigned long flags;
+ struct fotg210_qh *qh, *tmp;
+
+ /* ASSERT: any requests/urbs are being unlinked */
+ /* ASSERT: nobody can be submitting urbs for this any more */
+
+rescan:
+ spin_lock_irqsave(&fotg210->lock, flags);
+ qh = ep->hcpriv;
+ if (!qh)
+ goto done;
+
+ /* endpoints can be iso streams. for now, we don't
+ * accelerate iso completions ... so spin a while.
+ */
+ if (qh->hw == NULL) {
+ struct fotg210_iso_stream *stream = ep->hcpriv;
+
+ if (!list_empty(&stream->td_list))
+ goto idle_timeout;
+
+ /* BUG_ON(!list_empty(&stream->free_list)); */
+ kfree(stream);
+ goto done;
+ }
+
+ if (fotg210->rh_state < FOTG210_RH_RUNNING)
+ qh->qh_state = QH_STATE_IDLE;
+ switch (qh->qh_state) {
+ case QH_STATE_LINKED:
+ case QH_STATE_COMPLETING:
+ for (tmp = fotg210->async->qh_next.qh;
+ tmp && tmp != qh;
+ tmp = tmp->qh_next.qh)
+ continue;
+ /* periodic qh self-unlinks on empty, and a COMPLETING qh
+ * may already be unlinked.
+ */
+ if (tmp)
+ start_unlink_async(fotg210, qh);
+ /* FALL THROUGH */
+ case QH_STATE_UNLINK: /* wait for hw to finish? */
+ case QH_STATE_UNLINK_WAIT:
+idle_timeout:
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+ schedule_timeout_uninterruptible(1);
+ goto rescan;
+ case QH_STATE_IDLE: /* fully unlinked */
+ if (qh->clearing_tt)
+ goto idle_timeout;
+ if (list_empty(&qh->qtd_list)) {
+ qh_destroy(fotg210, qh);
+ break;
+ }
+ /* else FALL THROUGH */
+ default:
+ /* caller was supposed to have unlinked any requests;
+ * that's not our job. just leak this memory.
+ */
+ fotg210_err(fotg210, "qh %p (#%02x) state %d%s\n",
+ qh, ep->desc.bEndpointAddress, qh->qh_state,
+ list_empty(&qh->qtd_list) ? "" : "(has tds)");
+ break;
+ }
+ done:
+ ep->hcpriv = NULL;
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+}
+
+static void
+fotg210_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
+{
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+ struct fotg210_qh *qh;
+ int eptype = usb_endpoint_type(&ep->desc);
+ int epnum = usb_endpoint_num(&ep->desc);
+ int is_out = usb_endpoint_dir_out(&ep->desc);
+ unsigned long flags;
+
+ if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
+ return;
+
+ spin_lock_irqsave(&fotg210->lock, flags);
+ qh = ep->hcpriv;
+
+ /* For Bulk and Interrupt endpoints we maintain the toggle state
+ * in the hardware; the toggle bits in udev aren't used at all.
+ * When an endpoint is reset by usb_clear_halt() we must reset
+ * the toggle bit in the QH.
+ */
+ if (qh) {
+ usb_settoggle(qh->dev, epnum, is_out, 0);
+ if (!list_empty(&qh->qtd_list)) {
+ WARN_ONCE(1, "clear_halt for a busy endpoint\n");
+ } else if (qh->qh_state == QH_STATE_LINKED ||
+ qh->qh_state == QH_STATE_COMPLETING) {
+
+ /* The toggle value in the QH can't be updated
+ * while the QH is active. Unlink it now;
+ * re-linking will call qh_refresh().
+ */
+ if (eptype == USB_ENDPOINT_XFER_BULK)
+ start_unlink_async(fotg210, qh);
+ else
+ start_unlink_intr(fotg210, qh);
+ }
+ }
+ spin_unlock_irqrestore(&fotg210->lock, flags);
+}
+
+static int fotg210_get_frame(struct usb_hcd *hcd)
+{
+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+ return (fotg210_read_frame_index(fotg210) >> 3) %
+ fotg210->periodic_size;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * The EHCI in ChipIdea HDRC cannot be a separate module or device,
+ * because its registers (and irq) are shared between host/gadget/otg
+ * functions and in order to facilitate role switching we cannot
+ * give the fotg210 driver exclusive access to those.
+ */
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_LICENSE("GPL");
+
+static const struct hc_driver fotg210_fotg210_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "Faraday USB2.0 Host Controller",
+ .hcd_priv_size = sizeof(struct fotg210_hcd),
+
+ /*
+ * generic hardware linkage
+ */
+ .irq = fotg210_irq,
+ .flags = HCD_MEMORY | HCD_USB2,
+
+ /*
+ * basic lifecycle operations
+ */
+ .reset = hcd_fotg210_init,
+ .start = fotg210_run,
+ .stop = fotg210_stop,
+ .shutdown = fotg210_shutdown,
+
+ /*
+ * managing i/o requests and associated device resources
+ */
+ .urb_enqueue = fotg210_urb_enqueue,
+ .urb_dequeue = fotg210_urb_dequeue,
+ .endpoint_disable = fotg210_endpoint_disable,
+ .endpoint_reset = fotg210_endpoint_reset,
+
+ /*
+ * scheduling support
+ */
+ .get_frame_number = fotg210_get_frame,
+
+ /*
+ * root hub support
+ */
+ .hub_status_data = fotg210_hub_status_data,
+ .hub_control = fotg210_hub_control,
+ .bus_suspend = fotg210_bus_suspend,
+ .bus_resume = fotg210_bus_resume,
+
+ .relinquish_port = fotg210_relinquish_port,
+ .port_handed_over = fotg210_port_handed_over,
+
+ .clear_tt_buffer_complete = fotg210_clear_tt_buffer_complete,
+};
+
+static void fotg210_init(struct fotg210_hcd *fotg210)
+{
+ u32 value;
+
+ iowrite32(GMIR_MDEV_INT | GMIR_MOTG_INT | GMIR_INT_POLARITY,
+ &fotg210->regs->gmir);
+
+ value = ioread32(&fotg210->regs->otgcsr);
+ value &= ~OTGCSR_A_BUS_DROP;
+ value |= OTGCSR_A_BUS_REQ;
+ iowrite32(value, &fotg210->regs->otgcsr);
+}
+
+/**
+ * fotg210_hcd_probe - initialize faraday FOTG210 HCDs
+ *
+ * Allocates basic resources for this USB host controller, and
+ * then invokes the start() method for the HCD associated with it
+ * through the hotplug entry's driver_data.
+ */
+static int fotg210_hcd_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct usb_hcd *hcd;
+ struct resource *res;
+ int irq;
+ int retval = -ENODEV;
+ struct fotg210_hcd *fotg210;
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ pdev->dev.power.power_state = PMSG_ON;
+
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!res) {
+ dev_err(dev,
+ "Found HC with no IRQ. Check %s setup!\n",
+ dev_name(dev));
+ return -ENODEV;
+ }
+
+ irq = res->start;
+
+ hcd = usb_create_hcd(&fotg210_fotg210_hc_driver, dev,
+ dev_name(dev));
+ if (!hcd) {
+ dev_err(dev, "failed to create hcd with err %d\n", retval);
+ retval = -ENOMEM;
+ goto fail_create_hcd;
+ }
+
+ hcd->has_tt = 1;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ hcd->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(hcd->regs)) {
+ retval = PTR_ERR(hcd->regs);
+ goto failed;
+ }
+
+ hcd->rsrc_start = res->start;
+ hcd->rsrc_len = resource_size(res);
+
+ fotg210 = hcd_to_fotg210(hcd);
+
+ fotg210->caps = hcd->regs;
+
+ retval = fotg210_setup(hcd);
+ if (retval)
+ goto failed;
+
+ fotg210_init(fotg210);
+
+ retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
+ if (retval) {
+ dev_err(dev, "failed to add hcd with err %d\n", retval);
+ goto failed;
+ }
+ device_wakeup_enable(hcd->self.controller);
+
+ return retval;
+
+failed:
+ usb_put_hcd(hcd);
+fail_create_hcd:
+ dev_err(dev, "init %s fail, %d\n", dev_name(dev), retval);
+ return retval;
+}
+
+/**
+ * fotg210_hcd_remove - shutdown processing for EHCI HCDs
+ * @dev: USB Host Controller being removed
+ *
+ */
+static int fotg210_hcd_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+ if (!hcd)
+ return 0;
+
+ usb_remove_hcd(hcd);
+ usb_put_hcd(hcd);
+
+ return 0;
+}
+
+static struct platform_driver fotg210_hcd_driver = {
+ .driver = {
+ .name = "fotg210-hcd",
+ },
+ .probe = fotg210_hcd_probe,
+ .remove = fotg210_hcd_remove,
+};
+
+static int __init fotg210_hcd_init(void)
+{
+ int retval = 0;
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+ set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
+ if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
+ test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
+ pr_warn(KERN_WARNING "Warning! fotg210_hcd should always be loaded before uhci_hcd and ohci_hcd, not after\n");
+
+ pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd\n",
+ hcd_name,
+ sizeof(struct fotg210_qh), sizeof(struct fotg210_qtd),
+ sizeof(struct fotg210_itd));
+
+ fotg210_debug_root = debugfs_create_dir("fotg210", usb_debug_root);
+ if (!fotg210_debug_root) {
+ retval = -ENOENT;
+ goto err_debug;
+ }
+
+ retval = platform_driver_register(&fotg210_hcd_driver);
+ if (retval < 0)
+ goto clean;
+ return retval;
+
+ platform_driver_unregister(&fotg210_hcd_driver);
+clean:
+ debugfs_remove(fotg210_debug_root);
+ fotg210_debug_root = NULL;
+err_debug:
+ clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
+ return retval;
+}
+module_init(fotg210_hcd_init);
+
+static void __exit fotg210_hcd_cleanup(void)
+{
+ platform_driver_unregister(&fotg210_hcd_driver);
+ debugfs_remove(fotg210_debug_root);
+ clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
+}
+module_exit(fotg210_hcd_cleanup);
Code Review / kvmfornfv.git / blobdiff