--- /dev/null
+/*
+ * Driver for the PLX NET2280 USB device controller.
+ * Specs and errata are available from <http://www.plxtech.com>.
+ *
+ * PLX Technology Inc. (formerly NetChip Technology) supported the
+ * development of this driver.
+ *
+ *
+ * CODE STATUS HIGHLIGHTS
+ *
+ * This driver should work well with most "gadget" drivers, including
+ * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers
+ * as well as Gadget Zero and Gadgetfs.
+ *
+ * DMA is enabled by default.
+ *
+ * MSI is enabled by default. The legacy IRQ is used if MSI couldn't
+ * be enabled.
+ *
+ * Note that almost all the errata workarounds here are only needed for
+ * rev1 chips. Rev1a silicon (0110) fixes almost all of them.
+ */
+
+/*
+ * Copyright (C) 2003 David Brownell
+ * Copyright (C) 2003-2005 PLX Technology, Inc.
+ * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
+ *
+ * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
+ * with 2282 chip
+ *
+ * Modified Ricardo Ribalda Qtechnology AS to provide compatibility
+ * with usb 338x chip. Based on PLX 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.
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/prefetch.h>
+#include <linux/io.h>
+
+#include <asm/byteorder.h>
+#include <asm/irq.h>
+#include <asm/unaligned.h>
+
+#define DRIVER_DESC "PLX NET228x/USB338x USB Peripheral Controller"
+#define DRIVER_VERSION "2005 Sept 27/v3.0"
+
+#define EP_DONTUSE 13 /* nonzero */
+
+#define USE_RDK_LEDS /* GPIO pins control three LEDs */
+
+
+static const char driver_name[] = "net2280";
+static const char driver_desc[] = DRIVER_DESC;
+
+static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
+static const char ep0name[] = "ep0";
+static const char *const ep_name[] = {
+ ep0name,
+ "ep-a", "ep-b", "ep-c", "ep-d",
+ "ep-e", "ep-f", "ep-g", "ep-h",
+};
+
+/* Endpoint names for usb3380 advance mode */
+static const char *const ep_name_adv[] = {
+ ep0name,
+ "ep1in", "ep2out", "ep3in", "ep4out",
+ "ep1out", "ep2in", "ep3out", "ep4in",
+};
+
+/* mode 0 == ep-{a,b,c,d} 1K fifo each
+ * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
+ * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
+ */
+static ushort fifo_mode;
+
+/* "modprobe net2280 fifo_mode=1" etc */
+module_param(fifo_mode, ushort, 0644);
+
+/* enable_suspend -- When enabled, the driver will respond to
+ * USB suspend requests by powering down the NET2280. Otherwise,
+ * USB suspend requests will be ignored. This is acceptable for
+ * self-powered devices
+ */
+static bool enable_suspend;
+
+/* "modprobe net2280 enable_suspend=1" etc */
+module_param(enable_suspend, bool, 0444);
+
+#define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
+
+static char *type_string(u8 bmAttributes)
+{
+ switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
+ case USB_ENDPOINT_XFER_BULK: return "bulk";
+ case USB_ENDPOINT_XFER_ISOC: return "iso";
+ case USB_ENDPOINT_XFER_INT: return "intr";
+ }
+ return "control";
+}
+
+#include "net2280.h"
+
+#define valid_bit cpu_to_le32(BIT(VALID_BIT))
+#define dma_done_ie cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
+
+/*-------------------------------------------------------------------------*/
+static inline void enable_pciirqenb(struct net2280_ep *ep)
+{
+ u32 tmp = readl(&ep->dev->regs->pciirqenb0);
+
+ if (ep->dev->quirks & PLX_LEGACY)
+ tmp |= BIT(ep->num);
+ else
+ tmp |= BIT(ep_bit[ep->num]);
+ writel(tmp, &ep->dev->regs->pciirqenb0);
+
+ return;
+}
+
+static int
+net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
+{
+ struct net2280 *dev;
+ struct net2280_ep *ep;
+ u32 max, tmp;
+ unsigned long flags;
+ static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
+ int ret = 0;
+
+ ep = container_of(_ep, struct net2280_ep, ep);
+ if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
+ desc->bDescriptorType != USB_DT_ENDPOINT) {
+ pr_err("%s: failed at line=%d\n", __func__, __LINE__);
+ return -EINVAL;
+ }
+ dev = ep->dev;
+ if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
+ ret = -ESHUTDOWN;
+ goto print_err;
+ }
+
+ /* erratum 0119 workaround ties up an endpoint number */
+ if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
+ ret = -EDOM;
+ goto print_err;
+ }
+
+ if (dev->quirks & PLX_SUPERSPEED) {
+ if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
+ ret = -EDOM;
+ goto print_err;
+ }
+ ep->is_in = !!usb_endpoint_dir_in(desc);
+ if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
+ ret = -EINVAL;
+ goto print_err;
+ }
+ }
+
+ /* sanity check ep-e/ep-f since their fifos are small */
+ max = usb_endpoint_maxp(desc) & 0x1fff;
+ if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
+ ret = -ERANGE;
+ goto print_err;
+ }
+
+ spin_lock_irqsave(&dev->lock, flags);
+ _ep->maxpacket = max & 0x7ff;
+ ep->desc = desc;
+
+ /* ep_reset() has already been called */
+ ep->stopped = 0;
+ ep->wedged = 0;
+ ep->out_overflow = 0;
+
+ /* set speed-dependent max packet; may kick in high bandwidth */
+ set_max_speed(ep, max);
+
+ /* set type, direction, address; reset fifo counters */
+ writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
+ tmp = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
+ if (tmp == USB_ENDPOINT_XFER_INT) {
+ /* erratum 0105 workaround prevents hs NYET */
+ if (dev->chiprev == 0100 &&
+ dev->gadget.speed == USB_SPEED_HIGH &&
+ !(desc->bEndpointAddress & USB_DIR_IN))
+ writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE),
+ &ep->regs->ep_rsp);
+ } else if (tmp == USB_ENDPOINT_XFER_BULK) {
+ /* catch some particularly blatant driver bugs */
+ if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) ||
+ (dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
+ (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ ret = -ERANGE;
+ goto print_err;
+ }
+ }
+ ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
+ /* Enable this endpoint */
+ if (dev->quirks & PLX_LEGACY) {
+ tmp <<= ENDPOINT_TYPE;
+ tmp |= desc->bEndpointAddress;
+ /* default full fifo lines */
+ tmp |= (4 << ENDPOINT_BYTE_COUNT);
+ tmp |= BIT(ENDPOINT_ENABLE);
+ ep->is_in = (tmp & USB_DIR_IN) != 0;
+ } else {
+ /* In Legacy mode, only OUT endpoints are used */
+ if (dev->enhanced_mode && ep->is_in) {
+ tmp <<= IN_ENDPOINT_TYPE;
+ tmp |= BIT(IN_ENDPOINT_ENABLE);
+ /* Not applicable to Legacy */
+ tmp |= BIT(ENDPOINT_DIRECTION);
+ } else {
+ tmp <<= OUT_ENDPOINT_TYPE;
+ tmp |= BIT(OUT_ENDPOINT_ENABLE);
+ tmp |= (ep->is_in << ENDPOINT_DIRECTION);
+ }
+
+ tmp |= usb_endpoint_num(desc);
+ tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
+ }
+
+ /* Make sure all the registers are written before ep_rsp*/
+ wmb();
+
+ /* for OUT transfers, block the rx fifo until a read is posted */
+ if (!ep->is_in)
+ writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
+ else if (!(dev->quirks & PLX_2280)) {
+ /* Added for 2282, Don't use nak packets on an in endpoint,
+ * this was ignored on 2280
+ */
+ writel(BIT(CLEAR_NAK_OUT_PACKETS) |
+ BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
+ }
+
+ writel(tmp, &ep->cfg->ep_cfg);
+
+ /* enable irqs */
+ if (!ep->dma) { /* pio, per-packet */
+ enable_pciirqenb(ep);
+
+ tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
+ BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
+ if (dev->quirks & PLX_2280)
+ tmp |= readl(&ep->regs->ep_irqenb);
+ writel(tmp, &ep->regs->ep_irqenb);
+ } else { /* dma, per-request */
+ tmp = BIT((8 + ep->num)); /* completion */
+ tmp |= readl(&dev->regs->pciirqenb1);
+ writel(tmp, &dev->regs->pciirqenb1);
+
+ /* for short OUT transfers, dma completions can't
+ * advance the queue; do it pio-style, by hand.
+ * NOTE erratum 0112 workaround #2
+ */
+ if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
+ tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
+ writel(tmp, &ep->regs->ep_irqenb);
+
+ enable_pciirqenb(ep);
+ }
+ }
+
+ tmp = desc->bEndpointAddress;
+ ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
+ _ep->name, tmp & 0x0f, DIR_STRING(tmp),
+ type_string(desc->bmAttributes),
+ ep->dma ? "dma" : "pio", max);
+
+ /* pci writes may still be posted */
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return ret;
+
+print_err:
+ dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
+ return ret;
+}
+
+static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
+{
+ u32 result;
+
+ do {
+ result = readl(ptr);
+ if (result == ~(u32)0) /* "device unplugged" */
+ return -ENODEV;
+ result &= mask;
+ if (result == done)
+ return 0;
+ udelay(1);
+ usec--;
+ } while (usec > 0);
+ return -ETIMEDOUT;
+}
+
+static const struct usb_ep_ops net2280_ep_ops;
+
+static void ep_reset_228x(struct net2280_regs __iomem *regs,
+ struct net2280_ep *ep)
+{
+ u32 tmp;
+
+ ep->desc = NULL;
+ INIT_LIST_HEAD(&ep->queue);
+
+ usb_ep_set_maxpacket_limit(&ep->ep, ~0);
+ ep->ep.ops = &net2280_ep_ops;
+
+ /* disable the dma, irqs, endpoint... */
+ if (ep->dma) {
+ writel(0, &ep->dma->dmactl);
+ writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
+ BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
+ BIT(DMA_ABORT),
+ &ep->dma->dmastat);
+
+ tmp = readl(®s->pciirqenb0);
+ tmp &= ~BIT(ep->num);
+ writel(tmp, ®s->pciirqenb0);
+ } else {
+ tmp = readl(®s->pciirqenb1);
+ tmp &= ~BIT((8 + ep->num)); /* completion */
+ writel(tmp, ®s->pciirqenb1);
+ }
+ writel(0, &ep->regs->ep_irqenb);
+
+ /* init to our chosen defaults, notably so that we NAK OUT
+ * packets until the driver queues a read (+note erratum 0112)
+ */
+ if (!ep->is_in || (ep->dev->quirks & PLX_2280)) {
+ tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
+ BIT(SET_NAK_OUT_PACKETS) |
+ BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
+ BIT(CLEAR_INTERRUPT_MODE);
+ } else {
+ /* added for 2282 */
+ tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
+ BIT(CLEAR_NAK_OUT_PACKETS) |
+ BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
+ BIT(CLEAR_INTERRUPT_MODE);
+ }
+
+ if (ep->num != 0) {
+ tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
+ BIT(CLEAR_ENDPOINT_HALT);
+ }
+ writel(tmp, &ep->regs->ep_rsp);
+
+ /* scrub most status bits, and flush any fifo state */
+ if (ep->dev->quirks & PLX_2280)
+ tmp = BIT(FIFO_OVERFLOW) |
+ BIT(FIFO_UNDERFLOW);
+ else
+ tmp = 0;
+
+ writel(tmp | BIT(TIMEOUT) |
+ BIT(USB_STALL_SENT) |
+ BIT(USB_IN_NAK_SENT) |
+ BIT(USB_IN_ACK_RCVD) |
+ BIT(USB_OUT_PING_NAK_SENT) |
+ BIT(USB_OUT_ACK_SENT) |
+ BIT(FIFO_FLUSH) |
+ BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
+ BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
+ BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
+ BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
+ BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
+ BIT(DATA_IN_TOKEN_INTERRUPT),
+ &ep->regs->ep_stat);
+
+ /* fifo size is handled separately */
+}
+
+static void ep_reset_338x(struct net2280_regs __iomem *regs,
+ struct net2280_ep *ep)
+{
+ u32 tmp, dmastat;
+
+ ep->desc = NULL;
+ INIT_LIST_HEAD(&ep->queue);
+
+ usb_ep_set_maxpacket_limit(&ep->ep, ~0);
+ ep->ep.ops = &net2280_ep_ops;
+
+ /* disable the dma, irqs, endpoint... */
+ if (ep->dma) {
+ writel(0, &ep->dma->dmactl);
+ writel(BIT(DMA_ABORT_DONE_INTERRUPT) |
+ BIT(DMA_PAUSE_DONE_INTERRUPT) |
+ BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
+ BIT(DMA_TRANSACTION_DONE_INTERRUPT),
+ /* | BIT(DMA_ABORT), */
+ &ep->dma->dmastat);
+
+ dmastat = readl(&ep->dma->dmastat);
+ if (dmastat == 0x5002) {
+ ep_warn(ep->dev, "The dmastat return = %x!!\n",
+ dmastat);
+ writel(0x5a, &ep->dma->dmastat);
+ }
+
+ tmp = readl(®s->pciirqenb0);
+ tmp &= ~BIT(ep_bit[ep->num]);
+ writel(tmp, ®s->pciirqenb0);
+ } else {
+ if (ep->num < 5) {
+ tmp = readl(®s->pciirqenb1);
+ tmp &= ~BIT((8 + ep->num)); /* completion */
+ writel(tmp, ®s->pciirqenb1);
+ }
+ }
+ writel(0, &ep->regs->ep_irqenb);
+
+ writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
+ BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
+ BIT(FIFO_OVERFLOW) |
+ BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
+ BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
+ BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
+ BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
+}
+
+static void nuke(struct net2280_ep *);
+
+static int net2280_disable(struct usb_ep *_ep)
+{
+ struct net2280_ep *ep;
+ unsigned long flags;
+
+ ep = container_of(_ep, struct net2280_ep, ep);
+ if (!_ep || !ep->desc || _ep->name == ep0name) {
+ pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
+ return -EINVAL;
+ }
+ spin_lock_irqsave(&ep->dev->lock, flags);
+ nuke(ep);
+
+ if (ep->dev->quirks & PLX_SUPERSPEED)
+ ep_reset_338x(ep->dev->regs, ep);
+ else
+ ep_reset_228x(ep->dev->regs, ep);
+
+ ep_vdbg(ep->dev, "disabled %s %s\n",
+ ep->dma ? "dma" : "pio", _ep->name);
+
+ /* synch memory views with the device */
+ (void)readl(&ep->cfg->ep_cfg);
+
+ if (!ep->dma && ep->num >= 1 && ep->num <= 4)
+ ep->dma = &ep->dev->dma[ep->num - 1];
+
+ spin_unlock_irqrestore(&ep->dev->lock, flags);
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static struct usb_request
+*net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
+{
+ struct net2280_ep *ep;
+ struct net2280_request *req;
+
+ if (!_ep) {
+ pr_err("%s: Invalid ep\n", __func__);
+ return NULL;
+ }
+ ep = container_of(_ep, struct net2280_ep, ep);
+
+ req = kzalloc(sizeof(*req), gfp_flags);
+ if (!req)
+ return NULL;
+
+ INIT_LIST_HEAD(&req->queue);
+
+ /* this dma descriptor may be swapped with the previous dummy */
+ if (ep->dma) {
+ struct net2280_dma *td;
+
+ td = pci_pool_alloc(ep->dev->requests, gfp_flags,
+ &req->td_dma);
+ if (!td) {
+ kfree(req);
+ return NULL;
+ }
+ td->dmacount = 0; /* not VALID */
+ td->dmadesc = td->dmaaddr;
+ req->td = td;
+ }
+ return &req->req;
+}
+
+static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct net2280_ep *ep;
+ struct net2280_request *req;
+
+ ep = container_of(_ep, struct net2280_ep, ep);
+ if (!_ep || !_req) {
+ dev_err(&ep->dev->pdev->dev, "%s: Inavlid ep=%p or req=%p\n",
+ __func__, _ep, _req);
+ return;
+ }
+
+ req = container_of(_req, struct net2280_request, req);
+ WARN_ON(!list_empty(&req->queue));
+ if (req->td)
+ pci_pool_free(ep->dev->requests, req->td, req->td_dma);
+ kfree(req);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* load a packet into the fifo we use for usb IN transfers.
+ * works for all endpoints.
+ *
+ * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
+ * at a time, but this code is simpler because it knows it only writes
+ * one packet. ep-a..ep-d should use dma instead.
+ */
+static void write_fifo(struct net2280_ep *ep, struct usb_request *req)
+{
+ struct net2280_ep_regs __iomem *regs = ep->regs;
+ u8 *buf;
+ u32 tmp;
+ unsigned count, total;
+
+ /* INVARIANT: fifo is currently empty. (testable) */
+
+ if (req) {
+ buf = req->buf + req->actual;
+ prefetch(buf);
+ total = req->length - req->actual;
+ } else {
+ total = 0;
+ buf = NULL;
+ }
+
+ /* write just one packet at a time */
+ count = ep->ep.maxpacket;
+ if (count > total) /* min() cannot be used on a bitfield */
+ count = total;
+
+ ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
+ ep->ep.name, count,
+ (count != ep->ep.maxpacket) ? " (short)" : "",
+ req);
+ while (count >= 4) {
+ /* NOTE be careful if you try to align these. fifo lines
+ * should normally be full (4 bytes) and successive partial
+ * lines are ok only in certain cases.
+ */
+ tmp = get_unaligned((u32 *)buf);
+ cpu_to_le32s(&tmp);
+ writel(tmp, ®s->ep_data);
+ buf += 4;
+ count -= 4;
+ }
+
+ /* last fifo entry is "short" unless we wrote a full packet.
+ * also explicitly validate last word in (periodic) transfers
+ * when maxpacket is not a multiple of 4 bytes.
+ */
+ if (count || total < ep->ep.maxpacket) {
+ tmp = count ? get_unaligned((u32 *)buf) : count;
+ cpu_to_le32s(&tmp);
+ set_fifo_bytecount(ep, count & 0x03);
+ writel(tmp, ®s->ep_data);
+ }
+
+ /* pci writes may still be posted */
+}
+
+/* work around erratum 0106: PCI and USB race over the OUT fifo.
+ * caller guarantees chiprev 0100, out endpoint is NAKing, and
+ * there's no real data in the fifo.
+ *
+ * NOTE: also used in cases where that erratum doesn't apply:
+ * where the host wrote "too much" data to us.
+ */
+static void out_flush(struct net2280_ep *ep)
+{
+ u32 __iomem *statp;
+ u32 tmp;
+
+ statp = &ep->regs->ep_stat;
+
+ tmp = readl(statp);
+ if (tmp & BIT(NAK_OUT_PACKETS)) {
+ ep_dbg(ep->dev, "%s %s %08x !NAK\n",
+ ep->ep.name, __func__, tmp);
+ writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
+ }
+
+ writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
+ BIT(DATA_PACKET_RECEIVED_INTERRUPT),
+ statp);
+ writel(BIT(FIFO_FLUSH), statp);
+ /* Make sure that stap is written */
+ mb();
+ tmp = readl(statp);
+ if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) &&
+ /* high speed did bulk NYET; fifo isn't filling */
+ ep->dev->gadget.speed == USB_SPEED_FULL) {
+ unsigned usec;
+
+ usec = 50; /* 64 byte bulk/interrupt */
+ handshake(statp, BIT(USB_OUT_PING_NAK_SENT),
+ BIT(USB_OUT_PING_NAK_SENT), usec);
+ /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
+ }
+}
+
+/* unload packet(s) from the fifo we use for usb OUT transfers.
+ * returns true iff the request completed, because of short packet
+ * or the request buffer having filled with full packets.
+ *
+ * for ep-a..ep-d this will read multiple packets out when they
+ * have been accepted.
+ */
+static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
+{
+ struct net2280_ep_regs __iomem *regs = ep->regs;
+ u8 *buf = req->req.buf + req->req.actual;
+ unsigned count, tmp, is_short;
+ unsigned cleanup = 0, prevent = 0;
+
+ /* erratum 0106 ... packets coming in during fifo reads might
+ * be incompletely rejected. not all cases have workarounds.
+ */
+ if (ep->dev->chiprev == 0x0100 &&
+ ep->dev->gadget.speed == USB_SPEED_FULL) {
+ udelay(1);
+ tmp = readl(&ep->regs->ep_stat);
+ if ((tmp & BIT(NAK_OUT_PACKETS)))
+ cleanup = 1;
+ else if ((tmp & BIT(FIFO_FULL))) {
+ start_out_naking(ep);
+ prevent = 1;
+ }
+ /* else: hope we don't see the problem */
+ }
+
+ /* never overflow the rx buffer. the fifo reads packets until
+ * it sees a short one; we might not be ready for them all.
+ */
+ prefetchw(buf);
+ count = readl(®s->ep_avail);
+ if (unlikely(count == 0)) {
+ udelay(1);
+ tmp = readl(&ep->regs->ep_stat);
+ count = readl(®s->ep_avail);
+ /* handled that data already? */
+ if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0)
+ return 0;
+ }
+
+ tmp = req->req.length - req->req.actual;
+ if (count > tmp) {
+ /* as with DMA, data overflow gets flushed */
+ if ((tmp % ep->ep.maxpacket) != 0) {
+ ep_err(ep->dev,
+ "%s out fifo %d bytes, expected %d\n",
+ ep->ep.name, count, tmp);
+ req->req.status = -EOVERFLOW;
+ cleanup = 1;
+ /* NAK_OUT_PACKETS will be set, so flushing is safe;
+ * the next read will start with the next packet
+ */
+ } /* else it's a ZLP, no worries */
+ count = tmp;
+ }
+ req->req.actual += count;
+
+ is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
+
+ ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
+ ep->ep.name, count, is_short ? " (short)" : "",
+ cleanup ? " flush" : "", prevent ? " nak" : "",
+ req, req->req.actual, req->req.length);
+
+ while (count >= 4) {
+ tmp = readl(®s->ep_data);
+ cpu_to_le32s(&tmp);
+ put_unaligned(tmp, (u32 *)buf);
+ buf += 4;
+ count -= 4;
+ }
+ if (count) {
+ tmp = readl(®s->ep_data);
+ /* LE conversion is implicit here: */
+ do {
+ *buf++ = (u8) tmp;
+ tmp >>= 8;
+ } while (--count);
+ }
+ if (cleanup)
+ out_flush(ep);
+ if (prevent) {
+ writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
+ (void) readl(&ep->regs->ep_rsp);
+ }
+
+ return is_short || ((req->req.actual == req->req.length) &&
+ !req->req.zero);
+}
+
+/* fill out dma descriptor to match a given request */
+static void fill_dma_desc(struct net2280_ep *ep,
+ struct net2280_request *req, int valid)
+{
+ struct net2280_dma *td = req->td;
+ u32 dmacount = req->req.length;
+
+ /* don't let DMA continue after a short OUT packet,
+ * so overruns can't affect the next transfer.
+ * in case of overruns on max-size packets, we can't
+ * stop the fifo from filling but we can flush it.
+ */
+ if (ep->is_in)
+ dmacount |= BIT(DMA_DIRECTION);
+ if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
+ !(ep->dev->quirks & PLX_2280))
+ dmacount |= BIT(END_OF_CHAIN);
+
+ req->valid = valid;
+ if (valid)
+ dmacount |= BIT(VALID_BIT);
+ dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE);
+
+ /* td->dmadesc = previously set by caller */
+ td->dmaaddr = cpu_to_le32 (req->req.dma);
+
+ /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
+ wmb();
+ td->dmacount = cpu_to_le32(dmacount);
+}
+
+static const u32 dmactl_default =
+ BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
+ BIT(DMA_CLEAR_COUNT_ENABLE) |
+ /* erratum 0116 workaround part 1 (use POLLING) */
+ (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
+ BIT(DMA_VALID_BIT_POLLING_ENABLE) |
+ BIT(DMA_VALID_BIT_ENABLE) |
+ BIT(DMA_SCATTER_GATHER_ENABLE) |
+ /* erratum 0116 workaround part 2 (no AUTOSTART) */
+ BIT(DMA_ENABLE);
+
+static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
+{
+ handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
+}
+
+static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
+{
+ writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl);
+ spin_stop_dma(dma);
+}
+
+static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma)
+{
+ struct net2280_dma_regs __iomem *dma = ep->dma;
+ unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
+
+ if (!(ep->dev->quirks & PLX_2280))
+ tmp |= BIT(END_OF_CHAIN);
+
+ writel(tmp, &dma->dmacount);
+ writel(readl(&dma->dmastat), &dma->dmastat);
+
+ writel(td_dma, &dma->dmadesc);
+ if (ep->dev->quirks & PLX_SUPERSPEED)
+ dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
+ writel(dmactl, &dma->dmactl);
+
+ /* erratum 0116 workaround part 3: pci arbiter away from net2280 */
+ (void) readl(&ep->dev->pci->pcimstctl);
+
+ writel(BIT(DMA_START), &dma->dmastat);
+
+ if (!ep->is_in)
+ stop_out_naking(ep);
+}
+
+static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
+{
+ u32 tmp;
+ struct net2280_dma_regs __iomem *dma = ep->dma;
+
+ /* FIXME can't use DMA for ZLPs */
+
+ /* on this path we "know" there's no dma active (yet) */
+ WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
+ writel(0, &ep->dma->dmactl);
+
+ /* previous OUT packet might have been short */
+ if (!ep->is_in && (readl(&ep->regs->ep_stat) &
+ BIT(NAK_OUT_PACKETS))) {
+ writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
+ &ep->regs->ep_stat);
+
+ tmp = readl(&ep->regs->ep_avail);
+ if (tmp) {
+ writel(readl(&dma->dmastat), &dma->dmastat);
+
+ /* transfer all/some fifo data */
+ writel(req->req.dma, &dma->dmaaddr);
+ tmp = min(tmp, req->req.length);
+
+ /* dma irq, faking scatterlist status */
+ req->td->dmacount = cpu_to_le32(req->req.length - tmp);
+ writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
+ &dma->dmacount);
+ req->td->dmadesc = 0;
+ req->valid = 1;
+
+ writel(BIT(DMA_ENABLE), &dma->dmactl);
+ writel(BIT(DMA_START), &dma->dmastat);
+ return;
+ }
+ }
+
+ tmp = dmactl_default;
+
+ /* force packet boundaries between dma requests, but prevent the
+ * controller from automagically writing a last "short" packet
+ * (zero length) unless the driver explicitly said to do that.
+ */
+ if (ep->is_in) {
+ if (likely((req->req.length % ep->ep.maxpacket) ||
+ req->req.zero)){
+ tmp |= BIT(DMA_FIFO_VALIDATE);
+ ep->in_fifo_validate = 1;
+ } else
+ ep->in_fifo_validate = 0;
+ }
+
+ /* init req->td, pointing to the current dummy */
+ req->td->dmadesc = cpu_to_le32 (ep->td_dma);
+ fill_dma_desc(ep, req, 1);
+
+ req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
+
+ start_queue(ep, tmp, req->td_dma);
+}
+
+static inline void
+queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
+{
+ struct net2280_dma *end;
+ dma_addr_t tmp;
+
+ /* swap new dummy for old, link; fill and maybe activate */
+ end = ep->dummy;
+ ep->dummy = req->td;
+ req->td = end;
+
+ tmp = ep->td_dma;
+ ep->td_dma = req->td_dma;
+ req->td_dma = tmp;
+
+ end->dmadesc = cpu_to_le32 (ep->td_dma);
+
+ fill_dma_desc(ep, req, valid);
+}
+
+static void
+done(struct net2280_ep *ep, struct net2280_request *req, int status)
+{
+ struct net2280 *dev;
+ unsigned stopped = ep->stopped;
+
+ list_del_init(&req->queue);
+
+ if (req->req.status == -EINPROGRESS)
+ req->req.status = status;
+ else
+ status = req->req.status;
+
+ dev = ep->dev;
+ if (ep->dma)
+ usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
+
+ if (status && status != -ESHUTDOWN)
+ ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
+ ep->ep.name, &req->req, status,
+ req->req.actual, req->req.length);
+
+ /* don't modify queue heads during completion callback */
+ ep->stopped = 1;
+ spin_unlock(&dev->lock);
+ usb_gadget_giveback_request(&ep->ep, &req->req);
+ spin_lock(&dev->lock);
+ ep->stopped = stopped;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int
+net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
+{
+ struct net2280_request *req;
+ struct net2280_ep *ep;
+ struct net2280 *dev;
+ unsigned long flags;
+ int ret = 0;
+
+ /* we always require a cpu-view buffer, so that we can
+ * always use pio (as fallback or whatever).
+ */
+ ep = container_of(_ep, struct net2280_ep, ep);
+ if (!_ep || (!ep->desc && ep->num != 0)) {
+ pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
+ return -EINVAL;
+ }
+ req = container_of(_req, struct net2280_request, req);
+ if (!_req || !_req->complete || !_req->buf ||
+ !list_empty(&req->queue)) {
+ ret = -EINVAL;
+ goto print_err;
+ }
+ if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
+ ret = -EDOM;
+ goto print_err;
+ }
+ dev = ep->dev;
+ if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
+ ret = -ESHUTDOWN;
+ goto print_err;
+ }
+
+ /* FIXME implement PIO fallback for ZLPs with DMA */
+ if (ep->dma && _req->length == 0) {
+ ret = -EOPNOTSUPP;
+ goto print_err;
+ }
+
+ /* set up dma mapping in case the caller didn't */
+ if (ep->dma) {
+ ret = usb_gadget_map_request(&dev->gadget, _req,
+ ep->is_in);
+ if (ret)
+ goto print_err;
+ }
+
+ ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
+ _ep->name, _req, _req->length, _req->buf);
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ _req->status = -EINPROGRESS;
+ _req->actual = 0;
+
+ /* kickstart this i/o queue? */
+ if (list_empty(&ep->queue) && !ep->stopped &&
+ !((dev->quirks & PLX_SUPERSPEED) && ep->dma &&
+ (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
+
+ /* use DMA if the endpoint supports it, else pio */
+ if (ep->dma)
+ start_dma(ep, req);
+ else {
+ /* maybe there's no control data, just status ack */
+ if (ep->num == 0 && _req->length == 0) {
+ allow_status(ep);
+ done(ep, req, 0);
+ ep_vdbg(dev, "%s status ack\n", ep->ep.name);
+ goto done;
+ }
+
+ /* PIO ... stuff the fifo, or unblock it. */
+ if (ep->is_in)
+ write_fifo(ep, _req);
+ else if (list_empty(&ep->queue)) {
+ u32 s;
+
+ /* OUT FIFO might have packet(s) buffered */
+ s = readl(&ep->regs->ep_stat);
+ if ((s & BIT(FIFO_EMPTY)) == 0) {
+ /* note: _req->short_not_ok is
+ * ignored here since PIO _always_
+ * stops queue advance here, and
+ * _req->status doesn't change for
+ * short reads (only _req->actual)
+ */
+ if (read_fifo(ep, req) &&
+ ep->num == 0) {
+ done(ep, req, 0);
+ allow_status(ep);
+ /* don't queue it */
+ req = NULL;
+ } else if (read_fifo(ep, req) &&
+ ep->num != 0) {
+ done(ep, req, 0);
+ req = NULL;
+ } else
+ s = readl(&ep->regs->ep_stat);
+ }
+
+ /* don't NAK, let the fifo fill */
+ if (req && (s & BIT(NAK_OUT_PACKETS)))
+ writel(BIT(CLEAR_NAK_OUT_PACKETS),
+ &ep->regs->ep_rsp);
+ }
+ }
+
+ } else if (ep->dma) {
+ int valid = 1;
+
+ if (ep->is_in) {
+ int expect;
+
+ /* preventing magic zlps is per-engine state, not
+ * per-transfer; irq logic must recover hiccups.
+ */
+ expect = likely(req->req.zero ||
+ (req->req.length % ep->ep.maxpacket));
+ if (expect != ep->in_fifo_validate)
+ valid = 0;
+ }
+ queue_dma(ep, req, valid);
+
+ } /* else the irq handler advances the queue. */
+
+ ep->responded = 1;
+ if (req)
+ list_add_tail(&req->queue, &ep->queue);
+done:
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ /* pci writes may still be posted */
+ return ret;
+
+print_err:
+ dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
+ return ret;
+}
+
+static inline void
+dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
+ int status)
+{
+ req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
+ done(ep, req, status);
+}
+
+static void scan_dma_completions(struct net2280_ep *ep)
+{
+ /* only look at descriptors that were "naturally" retired,
+ * so fifo and list head state won't matter
+ */
+ while (!list_empty(&ep->queue)) {
+ struct net2280_request *req;
+ u32 tmp;
+
+ req = list_entry(ep->queue.next,
+ struct net2280_request, queue);
+ if (!req->valid)
+ break;
+ rmb();
+ tmp = le32_to_cpup(&req->td->dmacount);
+ if ((tmp & BIT(VALID_BIT)) != 0)
+ break;
+
+ /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
+ * cases where DMA must be aborted; this code handles
+ * all non-abort DMA completions.
+ */
+ if (unlikely(req->td->dmadesc == 0)) {
+ /* paranoia */
+ tmp = readl(&ep->dma->dmacount);
+ if (tmp & DMA_BYTE_COUNT_MASK)
+ break;
+ /* single transfer mode */
+ dma_done(ep, req, tmp, 0);
+ break;
+ } else if (!ep->is_in &&
+ (req->req.length % ep->ep.maxpacket) &&
+ !(ep->dev->quirks & PLX_SUPERSPEED)) {
+
+ tmp = readl(&ep->regs->ep_stat);
+ /* AVOID TROUBLE HERE by not issuing short reads from
+ * your gadget driver. That helps avoids errata 0121,
+ * 0122, and 0124; not all cases trigger the warning.
+ */
+ if ((tmp & BIT(NAK_OUT_PACKETS)) == 0) {
+ ep_warn(ep->dev, "%s lost packet sync!\n",
+ ep->ep.name);
+ req->req.status = -EOVERFLOW;
+ } else {
+ tmp = readl(&ep->regs->ep_avail);
+ if (tmp) {
+ /* fifo gets flushed later */
+ ep->out_overflow = 1;
+ ep_dbg(ep->dev,
+ "%s dma, discard %d len %d\n",
+ ep->ep.name, tmp,
+ req->req.length);
+ req->req.status = -EOVERFLOW;
+ }
+ }
+ }
+ dma_done(ep, req, tmp, 0);
+ }
+}
+
+static void restart_dma(struct net2280_ep *ep)
+{
+ struct net2280_request *req;
+
+ if (ep->stopped)
+ return;
+ req = list_entry(ep->queue.next, struct net2280_request, queue);
+
+ start_dma(ep, req);
+}
+
+static void abort_dma(struct net2280_ep *ep)
+{
+ /* abort the current transfer */
+ if (likely(!list_empty(&ep->queue))) {
+ /* FIXME work around errata 0121, 0122, 0124 */
+ writel(BIT(DMA_ABORT), &ep->dma->dmastat);
+ spin_stop_dma(ep->dma);
+ } else
+ stop_dma(ep->dma);
+ scan_dma_completions(ep);
+}
+
+/* dequeue ALL requests */
+static void nuke(struct net2280_ep *ep)
+{
+ struct net2280_request *req;
+
+ /* called with spinlock held */
+ ep->stopped = 1;
+ if (ep->dma)
+ abort_dma(ep);
+ while (!list_empty(&ep->queue)) {
+ req = list_entry(ep->queue.next,
+ struct net2280_request,
+ queue);
+ done(ep, req, -ESHUTDOWN);
+ }
+}
+
+/* dequeue JUST ONE request */
+static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct net2280_ep *ep;
+ struct net2280_request *req;
+ unsigned long flags;
+ u32 dmactl;
+ int stopped;
+
+ ep = container_of(_ep, struct net2280_ep, ep);
+ if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
+ pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
+ __func__, _ep, _req);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&ep->dev->lock, flags);
+ stopped = ep->stopped;
+
+ /* quiesce dma while we patch the queue */
+ dmactl = 0;
+ ep->stopped = 1;
+ if (ep->dma) {
+ dmactl = readl(&ep->dma->dmactl);
+ /* WARNING erratum 0127 may kick in ... */
+ stop_dma(ep->dma);
+ scan_dma_completions(ep);
+ }
+
+ /* make sure it's still queued on this endpoint */
+ list_for_each_entry(req, &ep->queue, queue) {
+ if (&req->req == _req)
+ break;
+ }
+ if (&req->req != _req) {
+ spin_unlock_irqrestore(&ep->dev->lock, flags);
+ dev_err(&ep->dev->pdev->dev, "%s: Request mismatch\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ /* queue head may be partially complete. */
+ if (ep->queue.next == &req->queue) {
+ if (ep->dma) {
+ ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
+ _req->status = -ECONNRESET;
+ abort_dma(ep);
+ if (likely(ep->queue.next == &req->queue)) {
+ /* NOTE: misreports single-transfer mode*/
+ req->td->dmacount = 0; /* invalidate */
+ dma_done(ep, req,
+ readl(&ep->dma->dmacount),
+ -ECONNRESET);
+ }
+ } else {
+ ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
+ done(ep, req, -ECONNRESET);
+ }
+ req = NULL;
+ }
+
+ if (req)
+ done(ep, req, -ECONNRESET);
+ ep->stopped = stopped;
+
+ if (ep->dma) {
+ /* turn off dma on inactive queues */
+ if (list_empty(&ep->queue))
+ stop_dma(ep->dma);
+ else if (!ep->stopped) {
+ /* resume current request, or start new one */
+ if (req)
+ writel(dmactl, &ep->dma->dmactl);
+ else
+ start_dma(ep, list_entry(ep->queue.next,
+ struct net2280_request, queue));
+ }
+ }
+
+ spin_unlock_irqrestore(&ep->dev->lock, flags);
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int net2280_fifo_status(struct usb_ep *_ep);
+
+static int
+net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
+{
+ struct net2280_ep *ep;
+ unsigned long flags;
+ int retval = 0;
+
+ ep = container_of(_ep, struct net2280_ep, ep);
+ if (!_ep || (!ep->desc && ep->num != 0)) {
+ pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
+ return -EINVAL;
+ }
+ if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
+ retval = -ESHUTDOWN;
+ goto print_err;
+ }
+ if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
+ == USB_ENDPOINT_XFER_ISOC) {
+ retval = -EINVAL;
+ goto print_err;
+ }
+
+ spin_lock_irqsave(&ep->dev->lock, flags);
+ if (!list_empty(&ep->queue)) {
+ retval = -EAGAIN;
+ goto print_unlock;
+ } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
+ retval = -EAGAIN;
+ goto print_unlock;
+ } else {
+ ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
+ value ? "set" : "clear",
+ wedged ? "wedge" : "halt");
+ /* set/clear, then synch memory views with the device */
+ if (value) {
+ if (ep->num == 0)
+ ep->dev->protocol_stall = 1;
+ else
+ set_halt(ep);
+ if (wedged)
+ ep->wedged = 1;
+ } else {
+ clear_halt(ep);
+ if (ep->dev->quirks & PLX_SUPERSPEED &&
+ !list_empty(&ep->queue) && ep->td_dma)
+ restart_dma(ep);
+ ep->wedged = 0;
+ }
+ (void) readl(&ep->regs->ep_rsp);
+ }
+ spin_unlock_irqrestore(&ep->dev->lock, flags);
+
+ return retval;
+
+print_unlock:
+ spin_unlock_irqrestore(&ep->dev->lock, flags);
+print_err:
+ dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
+ return retval;
+}
+
+static int net2280_set_halt(struct usb_ep *_ep, int value)
+{
+ return net2280_set_halt_and_wedge(_ep, value, 0);
+}
+
+static int net2280_set_wedge(struct usb_ep *_ep)
+{
+ if (!_ep || _ep->name == ep0name) {
+ pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
+ return -EINVAL;
+ }
+ return net2280_set_halt_and_wedge(_ep, 1, 1);
+}
+
+static int net2280_fifo_status(struct usb_ep *_ep)
+{
+ struct net2280_ep *ep;
+ u32 avail;
+
+ ep = container_of(_ep, struct net2280_ep, ep);
+ if (!_ep || (!ep->desc && ep->num != 0)) {
+ pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
+ return -ENODEV;
+ }
+ if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
+ dev_err(&ep->dev->pdev->dev,
+ "%s: Invalid driver=%p or speed=%d\n",
+ __func__, ep->dev->driver, ep->dev->gadget.speed);
+ return -ESHUTDOWN;
+ }
+
+ avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
+ if (avail > ep->fifo_size) {
+ dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
+ return -EOVERFLOW;
+ }
+ if (ep->is_in)
+ avail = ep->fifo_size - avail;
+ return avail;
+}
+
+static void net2280_fifo_flush(struct usb_ep *_ep)
+{
+ struct net2280_ep *ep;
+
+ ep = container_of(_ep, struct net2280_ep, ep);
+ if (!_ep || (!ep->desc && ep->num != 0)) {
+ pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
+ return;
+ }
+ if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
+ dev_err(&ep->dev->pdev->dev,
+ "%s: Invalid driver=%p or speed=%d\n",
+ __func__, ep->dev->driver, ep->dev->gadget.speed);
+ return;
+ }
+
+ writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
+ (void) readl(&ep->regs->ep_rsp);
+}
+
+static const struct usb_ep_ops net2280_ep_ops = {
+ .enable = net2280_enable,
+ .disable = net2280_disable,
+
+ .alloc_request = net2280_alloc_request,
+ .free_request = net2280_free_request,
+
+ .queue = net2280_queue,
+ .dequeue = net2280_dequeue,
+
+ .set_halt = net2280_set_halt,
+ .set_wedge = net2280_set_wedge,
+ .fifo_status = net2280_fifo_status,
+ .fifo_flush = net2280_fifo_flush,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int net2280_get_frame(struct usb_gadget *_gadget)
+{
+ struct net2280 *dev;
+ unsigned long flags;
+ u16 retval;
+
+ if (!_gadget)
+ return -ENODEV;
+ dev = container_of(_gadget, struct net2280, gadget);
+ spin_lock_irqsave(&dev->lock, flags);
+ retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return retval;
+}
+
+static int net2280_wakeup(struct usb_gadget *_gadget)
+{
+ struct net2280 *dev;
+ u32 tmp;
+ unsigned long flags;
+
+ if (!_gadget)
+ return 0;
+ dev = container_of(_gadget, struct net2280, gadget);
+
+ spin_lock_irqsave(&dev->lock, flags);
+ tmp = readl(&dev->usb->usbctl);
+ if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
+ writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ /* pci writes may still be posted */
+ return 0;
+}
+
+static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
+{
+ struct net2280 *dev;
+ u32 tmp;
+ unsigned long flags;
+
+ if (!_gadget)
+ return 0;
+ dev = container_of(_gadget, struct net2280, gadget);
+
+ spin_lock_irqsave(&dev->lock, flags);
+ tmp = readl(&dev->usb->usbctl);
+ if (value) {
+ tmp |= BIT(SELF_POWERED_STATUS);
+ _gadget->is_selfpowered = 1;
+ } else {
+ tmp &= ~BIT(SELF_POWERED_STATUS);
+ _gadget->is_selfpowered = 0;
+ }
+ writel(tmp, &dev->usb->usbctl);
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ return 0;
+}
+
+static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
+{
+ struct net2280 *dev;
+ u32 tmp;
+ unsigned long flags;
+
+ if (!_gadget)
+ return -ENODEV;
+ dev = container_of(_gadget, struct net2280, gadget);
+
+ spin_lock_irqsave(&dev->lock, flags);
+ tmp = readl(&dev->usb->usbctl);
+ dev->softconnect = (is_on != 0);
+ if (is_on)
+ tmp |= BIT(USB_DETECT_ENABLE);
+ else
+ tmp &= ~BIT(USB_DETECT_ENABLE);
+ writel(tmp, &dev->usb->usbctl);
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ return 0;
+}
+
+static int net2280_start(struct usb_gadget *_gadget,
+ struct usb_gadget_driver *driver);
+static int net2280_stop(struct usb_gadget *_gadget);
+
+static const struct usb_gadget_ops net2280_ops = {
+ .get_frame = net2280_get_frame,
+ .wakeup = net2280_wakeup,
+ .set_selfpowered = net2280_set_selfpowered,
+ .pullup = net2280_pullup,
+ .udc_start = net2280_start,
+ .udc_stop = net2280_stop,
+};
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef CONFIG_USB_GADGET_DEBUG_FILES
+
+/* FIXME move these into procfs, and use seq_file.
+ * Sysfs _still_ doesn't behave for arbitrarily sized files,
+ * and also doesn't help products using this with 2.4 kernels.
+ */
+
+/* "function" sysfs attribute */
+static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct net2280 *dev = dev_get_drvdata(_dev);
+
+ if (!dev->driver || !dev->driver->function ||
+ strlen(dev->driver->function) > PAGE_SIZE)
+ return 0;
+ return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
+}
+static DEVICE_ATTR_RO(function);
+
+static ssize_t registers_show(struct device *_dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct net2280 *dev;
+ char *next;
+ unsigned size, t;
+ unsigned long flags;
+ int i;
+ u32 t1, t2;
+ const char *s;
+
+ dev = dev_get_drvdata(_dev);
+ next = buf;
+ size = PAGE_SIZE;
+ spin_lock_irqsave(&dev->lock, flags);
+
+ if (dev->driver)
+ s = dev->driver->driver.name;
+ else
+ s = "(none)";
+
+ /* Main Control Registers */
+ t = scnprintf(next, size, "%s version " DRIVER_VERSION
+ ", chiprev %04x\n\n"
+ "devinit %03x fifoctl %08x gadget '%s'\n"
+ "pci irqenb0 %02x irqenb1 %08x "
+ "irqstat0 %04x irqstat1 %08x\n",
+ driver_name, dev->chiprev,
+ readl(&dev->regs->devinit),
+ readl(&dev->regs->fifoctl),
+ s,
+ readl(&dev->regs->pciirqenb0),
+ readl(&dev->regs->pciirqenb1),
+ readl(&dev->regs->irqstat0),
+ readl(&dev->regs->irqstat1));
+ size -= t;
+ next += t;
+
+ /* USB Control Registers */
+ t1 = readl(&dev->usb->usbctl);
+ t2 = readl(&dev->usb->usbstat);
+ if (t1 & BIT(VBUS_PIN)) {
+ if (t2 & BIT(HIGH_SPEED))
+ s = "high speed";
+ else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
+ s = "powered";
+ else
+ s = "full speed";
+ /* full speed bit (6) not working?? */
+ } else
+ s = "not attached";
+ t = scnprintf(next, size,
+ "stdrsp %08x usbctl %08x usbstat %08x "
+ "addr 0x%02x (%s)\n",
+ readl(&dev->usb->stdrsp), t1, t2,
+ readl(&dev->usb->ouraddr), s);
+ size -= t;
+ next += t;
+
+ /* PCI Master Control Registers */
+
+ /* DMA Control Registers */
+
+ /* Configurable EP Control Registers */
+ for (i = 0; i < dev->n_ep; i++) {
+ struct net2280_ep *ep;
+
+ ep = &dev->ep[i];
+ if (i && !ep->desc)
+ continue;
+
+ t1 = readl(&ep->cfg->ep_cfg);
+ t2 = readl(&ep->regs->ep_rsp) & 0xff;
+ t = scnprintf(next, size,
+ "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
+ "irqenb %02x\n",
+ ep->ep.name, t1, t2,
+ (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
+ ? "NAK " : "",
+ (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
+ ? "hide " : "",
+ (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
+ ? "CRC " : "",
+ (t2 & BIT(CLEAR_INTERRUPT_MODE))
+ ? "interrupt " : "",
+ (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
+ ? "status " : "",
+ (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
+ ? "NAKmode " : "",
+ (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
+ ? "DATA1 " : "DATA0 ",
+ (t2 & BIT(CLEAR_ENDPOINT_HALT))
+ ? "HALT " : "",
+ readl(&ep->regs->ep_irqenb));
+ size -= t;
+ next += t;
+
+ t = scnprintf(next, size,
+ "\tstat %08x avail %04x "
+ "(ep%d%s-%s)%s\n",
+ readl(&ep->regs->ep_stat),
+ readl(&ep->regs->ep_avail),
+ t1 & 0x0f, DIR_STRING(t1),
+ type_string(t1 >> 8),
+ ep->stopped ? "*" : "");
+ size -= t;
+ next += t;
+
+ if (!ep->dma)
+ continue;
+
+ t = scnprintf(next, size,
+ " dma\tctl %08x stat %08x count %08x\n"
+ "\taddr %08x desc %08x\n",
+ readl(&ep->dma->dmactl),
+ readl(&ep->dma->dmastat),
+ readl(&ep->dma->dmacount),
+ readl(&ep->dma->dmaaddr),
+ readl(&ep->dma->dmadesc));
+ size -= t;
+ next += t;
+
+ }
+
+ /* Indexed Registers (none yet) */
+
+ /* Statistics */
+ t = scnprintf(next, size, "\nirqs: ");
+ size -= t;
+ next += t;
+ for (i = 0; i < dev->n_ep; i++) {
+ struct net2280_ep *ep;
+
+ ep = &dev->ep[i];
+ if (i && !ep->irqs)
+ continue;
+ t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
+ size -= t;
+ next += t;
+
+ }
+ t = scnprintf(next, size, "\n");
+ size -= t;
+ next += t;
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ return PAGE_SIZE - size;
+}
+static DEVICE_ATTR_RO(registers);
+
+static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct net2280 *dev;
+ char *next;
+ unsigned size;
+ unsigned long flags;
+ int i;
+
+ dev = dev_get_drvdata(_dev);
+ next = buf;
+ size = PAGE_SIZE;
+ spin_lock_irqsave(&dev->lock, flags);
+
+ for (i = 0; i < dev->n_ep; i++) {
+ struct net2280_ep *ep = &dev->ep[i];
+ struct net2280_request *req;
+ int t;
+
+ if (i != 0) {
+ const struct usb_endpoint_descriptor *d;
+
+ d = ep->desc;
+ if (!d)
+ continue;
+ t = d->bEndpointAddress;
+ t = scnprintf(next, size,
+ "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
+ ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
+ (t & USB_DIR_IN) ? "in" : "out",
+ type_string(d->bmAttributes),
+ usb_endpoint_maxp(d) & 0x1fff,
+ ep->dma ? "dma" : "pio", ep->fifo_size
+ );
+ } else /* ep0 should only have one transfer queued */
+ t = scnprintf(next, size, "ep0 max 64 pio %s\n",
+ ep->is_in ? "in" : "out");
+ if (t <= 0 || t > size)
+ goto done;
+ size -= t;
+ next += t;
+
+ if (list_empty(&ep->queue)) {
+ t = scnprintf(next, size, "\t(nothing queued)\n");
+ if (t <= 0 || t > size)
+ goto done;
+ size -= t;
+ next += t;
+ continue;
+ }
+ list_for_each_entry(req, &ep->queue, queue) {
+ if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
+ t = scnprintf(next, size,
+ "\treq %p len %d/%d "
+ "buf %p (dmacount %08x)\n",
+ &req->req, req->req.actual,
+ req->req.length, req->req.buf,
+ readl(&ep->dma->dmacount));
+ else
+ t = scnprintf(next, size,
+ "\treq %p len %d/%d buf %p\n",
+ &req->req, req->req.actual,
+ req->req.length, req->req.buf);
+ if (t <= 0 || t > size)
+ goto done;
+ size -= t;
+ next += t;
+
+ if (ep->dma) {
+ struct net2280_dma *td;
+
+ td = req->td;
+ t = scnprintf(next, size, "\t td %08x "
+ " count %08x buf %08x desc %08x\n",
+ (u32) req->td_dma,
+ le32_to_cpu(td->dmacount),
+ le32_to_cpu(td->dmaaddr),
+ le32_to_cpu(td->dmadesc));
+ if (t <= 0 || t > size)
+ goto done;
+ size -= t;
+ next += t;
+ }
+ }
+ }
+
+done:
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return PAGE_SIZE - size;
+}
+static DEVICE_ATTR_RO(queues);
+
+
+#else
+
+#define device_create_file(a, b) (0)
+#define device_remove_file(a, b) do { } while (0)
+
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+/* another driver-specific mode might be a request type doing dma
+ * to/from another device fifo instead of to/from memory.
+ */
+
+static void set_fifo_mode(struct net2280 *dev, int mode)
+{
+ /* keeping high bits preserves BAR2 */
+ writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
+
+ /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
+ INIT_LIST_HEAD(&dev->gadget.ep_list);
+ list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
+ list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
+ switch (mode) {
+ case 0:
+ list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
+ list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
+ dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
+ break;
+ case 1:
+ dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
+ break;
+ case 2:
+ list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
+ dev->ep[1].fifo_size = 2048;
+ dev->ep[2].fifo_size = 1024;
+ break;
+ }
+ /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
+ list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
+ list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
+}
+
+static void defect7374_disable_data_eps(struct net2280 *dev)
+{
+ /*
+ * For Defect 7374, disable data EPs (and more):
+ * - This phase undoes the earlier phase of the Defect 7374 workaround,
+ * returing ep regs back to normal.
+ */
+ struct net2280_ep *ep;
+ int i;
+ unsigned char ep_sel;
+ u32 tmp_reg;
+
+ for (i = 1; i < 5; i++) {
+ ep = &dev->ep[i];
+ writel(0, &ep->cfg->ep_cfg);
+ }
+
+ /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
+ for (i = 0; i < 6; i++)
+ writel(0, &dev->dep[i].dep_cfg);
+
+ for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
+ /* Select an endpoint for subsequent operations: */
+ tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
+ writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
+
+ if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
+ ep_sel == 18 || ep_sel == 20)
+ continue;
+
+ /* Change settings on some selected endpoints */
+ tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
+ tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
+ writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
+ tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
+ tmp_reg |= BIT(EP_INITIALIZED);
+ writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
+ }
+}
+
+static void defect7374_enable_data_eps_zero(struct net2280 *dev)
+{
+ u32 tmp = 0, tmp_reg;
+ u32 scratch;
+ int i;
+ unsigned char ep_sel;
+
+ scratch = get_idx_reg(dev->regs, SCRATCH);
+
+ WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
+ == DEFECT7374_FSM_SS_CONTROL_READ);
+
+ scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
+
+ ep_warn(dev, "Operate Defect 7374 workaround soft this time");
+ ep_warn(dev, "It will operate on cold-reboot and SS connect");
+
+ /*GPEPs:*/
+ tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
+ (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
+ ((dev->enhanced_mode) ?
+ BIT(OUT_ENDPOINT_ENABLE) : BIT(ENDPOINT_ENABLE)) |
+ BIT(IN_ENDPOINT_ENABLE));
+
+ for (i = 1; i < 5; i++)
+ writel(tmp, &dev->ep[i].cfg->ep_cfg);
+
+ /* CSRIN, PCIIN, STATIN, RCIN*/
+ tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
+ writel(tmp, &dev->dep[1].dep_cfg);
+ writel(tmp, &dev->dep[3].dep_cfg);
+ writel(tmp, &dev->dep[4].dep_cfg);
+ writel(tmp, &dev->dep[5].dep_cfg);
+
+ /*Implemented for development and debug.
+ * Can be refined/tuned later.*/
+ for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
+ /* Select an endpoint for subsequent operations: */
+ tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
+ writel(((tmp_reg & ~0x1f) | ep_sel),
+ &dev->plregs->pl_ep_ctrl);
+
+ if (ep_sel == 1) {
+ tmp =
+ (readl(&dev->plregs->pl_ep_ctrl) |
+ BIT(CLEAR_ACK_ERROR_CODE) | 0);
+ writel(tmp, &dev->plregs->pl_ep_ctrl);
+ continue;
+ }
+
+ if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
+ ep_sel == 18 || ep_sel == 20)
+ continue;
+
+ tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
+ BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
+ writel(tmp, &dev->plregs->pl_ep_cfg_4);
+
+ tmp = readl(&dev->plregs->pl_ep_ctrl) &
+ ~BIT(EP_INITIALIZED);
+ writel(tmp, &dev->plregs->pl_ep_ctrl);
+
+ }
+
+ /* Set FSM to focus on the first Control Read:
+ * - Tip: Connection speed is known upon the first
+ * setup request.*/
+ scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
+ set_idx_reg(dev->regs, SCRATCH, scratch);
+
+}
+
+/* keeping it simple:
+ * - one bus driver, initted first;
+ * - one function driver, initted second
+ *
+ * most of the work to support multiple net2280 controllers would
+ * be to associate this gadget driver (yes?) with all of them, or
+ * perhaps to bind specific drivers to specific devices.
+ */
+
+static void usb_reset_228x(struct net2280 *dev)
+{
+ u32 tmp;
+
+ dev->gadget.speed = USB_SPEED_UNKNOWN;
+ (void) readl(&dev->usb->usbctl);
+
+ net2280_led_init(dev);
+
+ /* disable automatic responses, and irqs */
+ writel(0, &dev->usb->stdrsp);
+ writel(0, &dev->regs->pciirqenb0);
+ writel(0, &dev->regs->pciirqenb1);
+
+ /* clear old dma and irq state */
+ for (tmp = 0; tmp < 4; tmp++) {
+ struct net2280_ep *ep = &dev->ep[tmp + 1];
+ if (ep->dma)
+ abort_dma(ep);
+ }
+
+ writel(~0, &dev->regs->irqstat0),
+ writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
+
+ /* reset, and enable pci */
+ tmp = readl(&dev->regs->devinit) |
+ BIT(PCI_ENABLE) |
+ BIT(FIFO_SOFT_RESET) |
+ BIT(USB_SOFT_RESET) |
+ BIT(M8051_RESET);
+ writel(tmp, &dev->regs->devinit);
+
+ /* standard fifo and endpoint allocations */
+ set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
+}
+
+static void usb_reset_338x(struct net2280 *dev)
+{
+ u32 tmp;
+
+ dev->gadget.speed = USB_SPEED_UNKNOWN;
+ (void)readl(&dev->usb->usbctl);
+
+ net2280_led_init(dev);
+
+ if (dev->bug7734_patched) {
+ /* disable automatic responses, and irqs */
+ writel(0, &dev->usb->stdrsp);
+ writel(0, &dev->regs->pciirqenb0);
+ writel(0, &dev->regs->pciirqenb1);
+ }
+
+ /* clear old dma and irq state */
+ for (tmp = 0; tmp < 4; tmp++) {
+ struct net2280_ep *ep = &dev->ep[tmp + 1];
+
+ if (ep->dma)
+ abort_dma(ep);
+ }
+
+ writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
+
+ if (dev->bug7734_patched) {
+ /* reset, and enable pci */
+ tmp = readl(&dev->regs->devinit) |
+ BIT(PCI_ENABLE) |
+ BIT(FIFO_SOFT_RESET) |
+ BIT(USB_SOFT_RESET) |
+ BIT(M8051_RESET);
+
+ writel(tmp, &dev->regs->devinit);
+ }
+
+ /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
+ INIT_LIST_HEAD(&dev->gadget.ep_list);
+
+ for (tmp = 1; tmp < dev->n_ep; tmp++)
+ list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
+
+}
+
+static void usb_reset(struct net2280 *dev)
+{
+ if (dev->quirks & PLX_LEGACY)
+ return usb_reset_228x(dev);
+ return usb_reset_338x(dev);
+}
+
+static void usb_reinit_228x(struct net2280 *dev)
+{
+ u32 tmp;
+
+ /* basic endpoint init */
+ for (tmp = 0; tmp < 7; tmp++) {
+ struct net2280_ep *ep = &dev->ep[tmp];
+
+ ep->ep.name = ep_name[tmp];
+ ep->dev = dev;
+ ep->num = tmp;
+
+ if (tmp > 0 && tmp <= 4) {
+ ep->fifo_size = 1024;
+ ep->dma = &dev->dma[tmp - 1];
+ } else
+ ep->fifo_size = 64;
+ ep->regs = &dev->epregs[tmp];
+ ep->cfg = &dev->epregs[tmp];
+ ep_reset_228x(dev->regs, ep);
+ }
+ usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
+ usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
+ usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
+
+ dev->gadget.ep0 = &dev->ep[0].ep;
+ dev->ep[0].stopped = 0;
+ INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
+
+ /* we want to prevent lowlevel/insecure access from the USB host,
+ * but erratum 0119 means this enable bit is ignored
+ */
+ for (tmp = 0; tmp < 5; tmp++)
+ writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
+}
+
+static void usb_reinit_338x(struct net2280 *dev)
+{
+ int i;
+ u32 tmp, val;
+ static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
+ static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
+ 0x00, 0xC0, 0x00, 0xC0 };
+
+ /* basic endpoint init */
+ for (i = 0; i < dev->n_ep; i++) {
+ struct net2280_ep *ep = &dev->ep[i];
+
+ ep->ep.name = dev->enhanced_mode ? ep_name_adv[i] : ep_name[i];
+ ep->dev = dev;
+ ep->num = i;
+
+ if (i > 0 && i <= 4)
+ ep->dma = &dev->dma[i - 1];
+
+ if (dev->enhanced_mode) {
+ ep->cfg = &dev->epregs[ne[i]];
+ ep->regs = (struct net2280_ep_regs __iomem *)
+ (((void __iomem *)&dev->epregs[ne[i]]) +
+ ep_reg_addr[i]);
+ } else {
+ ep->cfg = &dev->epregs[i];
+ ep->regs = &dev->epregs[i];
+ }
+
+ ep->fifo_size = (i != 0) ? 2048 : 512;
+
+ ep_reset_338x(dev->regs, ep);
+ }
+ usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
+
+ dev->gadget.ep0 = &dev->ep[0].ep;
+ dev->ep[0].stopped = 0;
+
+ /* Link layer set up */
+ if (dev->bug7734_patched) {
+ tmp = readl(&dev->usb_ext->usbctl2) &
+ ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
+ writel(tmp, &dev->usb_ext->usbctl2);
+ }
+
+ /* Hardware Defect and Workaround */
+ val = readl(&dev->ll_lfps_regs->ll_lfps_5);
+ val &= ~(0xf << TIMER_LFPS_6US);
+ val |= 0x5 << TIMER_LFPS_6US;
+ writel(val, &dev->ll_lfps_regs->ll_lfps_5);
+
+ val = readl(&dev->ll_lfps_regs->ll_lfps_6);
+ val &= ~(0xffff << TIMER_LFPS_80US);
+ val |= 0x0100 << TIMER_LFPS_80US;
+ writel(val, &dev->ll_lfps_regs->ll_lfps_6);
+
+ /*
+ * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
+ * Hot Reset Exit Handshake may Fail in Specific Case using
+ * Default Register Settings. Workaround for Enumeration test.
+ */
+ val = readl(&dev->ll_tsn_regs->ll_tsn_counters_2);
+ val &= ~(0x1f << HOT_TX_NORESET_TS2);
+ val |= 0x10 << HOT_TX_NORESET_TS2;
+ writel(val, &dev->ll_tsn_regs->ll_tsn_counters_2);
+
+ val = readl(&dev->ll_tsn_regs->ll_tsn_counters_3);
+ val &= ~(0x1f << HOT_RX_RESET_TS2);
+ val |= 0x3 << HOT_RX_RESET_TS2;
+ writel(val, &dev->ll_tsn_regs->ll_tsn_counters_3);
+
+ /*
+ * Set Recovery Idle to Recover bit:
+ * - On SS connections, setting Recovery Idle to Recover Fmw improves
+ * link robustness with various hosts and hubs.
+ * - It is safe to set for all connection speeds; all chip revisions.
+ * - R-M-W to leave other bits undisturbed.
+ * - Reference PLX TT-7372
+ */
+ val = readl(&dev->ll_chicken_reg->ll_tsn_chicken_bit);
+ val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
+ writel(val, &dev->ll_chicken_reg->ll_tsn_chicken_bit);
+
+ INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
+
+ /* disable dedicated endpoints */
+ writel(0x0D, &dev->dep[0].dep_cfg);
+ writel(0x0D, &dev->dep[1].dep_cfg);
+ writel(0x0E, &dev->dep[2].dep_cfg);
+ writel(0x0E, &dev->dep[3].dep_cfg);
+ writel(0x0F, &dev->dep[4].dep_cfg);
+ writel(0x0C, &dev->dep[5].dep_cfg);
+}
+
+static void usb_reinit(struct net2280 *dev)
+{
+ if (dev->quirks & PLX_LEGACY)
+ return usb_reinit_228x(dev);
+ return usb_reinit_338x(dev);
+}
+
+static void ep0_start_228x(struct net2280 *dev)
+{
+ writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
+ BIT(CLEAR_NAK_OUT_PACKETS) |
+ BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
+ &dev->epregs[0].ep_rsp);
+
+ /*
+ * hardware optionally handles a bunch of standard requests
+ * that the API hides from drivers anyway. have it do so.
+ * endpoint status/features are handled in software, to
+ * help pass tests for some dubious behavior.
+ */
+ writel(BIT(SET_TEST_MODE) |
+ BIT(SET_ADDRESS) |
+ BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
+ BIT(GET_DEVICE_STATUS) |
+ BIT(GET_INTERFACE_STATUS),
+ &dev->usb->stdrsp);
+ writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
+ BIT(SELF_POWERED_USB_DEVICE) |
+ BIT(REMOTE_WAKEUP_SUPPORT) |
+ (dev->softconnect << USB_DETECT_ENABLE) |
+ BIT(SELF_POWERED_STATUS),
+ &dev->usb->usbctl);
+
+ /* enable irqs so we can see ep0 and general operation */
+ writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
+ BIT(ENDPOINT_0_INTERRUPT_ENABLE),
+ &dev->regs->pciirqenb0);
+ writel(BIT(PCI_INTERRUPT_ENABLE) |
+ BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
+ BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
+ BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
+ BIT(VBUS_INTERRUPT_ENABLE) |
+ BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
+ BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
+ &dev->regs->pciirqenb1);
+
+ /* don't leave any writes posted */
+ (void) readl(&dev->usb->usbctl);
+}
+
+static void ep0_start_338x(struct net2280 *dev)
+{
+
+ if (dev->bug7734_patched)
+ writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
+ BIT(SET_EP_HIDE_STATUS_PHASE),
+ &dev->epregs[0].ep_rsp);
+
+ /*
+ * hardware optionally handles a bunch of standard requests
+ * that the API hides from drivers anyway. have it do so.
+ * endpoint status/features are handled in software, to
+ * help pass tests for some dubious behavior.
+ */
+ writel(BIT(SET_ISOCHRONOUS_DELAY) |
+ BIT(SET_SEL) |
+ BIT(SET_TEST_MODE) |
+ BIT(SET_ADDRESS) |
+ BIT(GET_INTERFACE_STATUS) |
+ BIT(GET_DEVICE_STATUS),
+ &dev->usb->stdrsp);
+ dev->wakeup_enable = 1;
+ writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
+ (dev->softconnect << USB_DETECT_ENABLE) |
+ BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
+ &dev->usb->usbctl);
+
+ /* enable irqs so we can see ep0 and general operation */
+ writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
+ BIT(ENDPOINT_0_INTERRUPT_ENABLE),
+ &dev->regs->pciirqenb0);
+ writel(BIT(PCI_INTERRUPT_ENABLE) |
+ BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
+ BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
+ BIT(VBUS_INTERRUPT_ENABLE),
+ &dev->regs->pciirqenb1);
+
+ /* don't leave any writes posted */
+ (void)readl(&dev->usb->usbctl);
+}
+
+static void ep0_start(struct net2280 *dev)
+{
+ if (dev->quirks & PLX_LEGACY)
+ return ep0_start_228x(dev);
+ return ep0_start_338x(dev);
+}
+
+/* when a driver is successfully registered, it will receive
+ * control requests including set_configuration(), which enables
+ * non-control requests. then usb traffic follows until a
+ * disconnect is reported. then a host may connect again, or
+ * the driver might get unbound.
+ */
+static int net2280_start(struct usb_gadget *_gadget,
+ struct usb_gadget_driver *driver)
+{
+ struct net2280 *dev;
+ int retval;
+ unsigned i;
+
+ /* insist on high speed support from the driver, since
+ * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
+ * "must not be used in normal operation"
+ */
+ if (!driver || driver->max_speed < USB_SPEED_HIGH ||
+ !driver->setup)
+ return -EINVAL;
+
+ dev = container_of(_gadget, struct net2280, gadget);
+
+ for (i = 0; i < dev->n_ep; i++)
+ dev->ep[i].irqs = 0;
+
+ /* hook up the driver ... */
+ driver->driver.bus = NULL;
+ dev->driver = driver;
+
+ retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
+ if (retval)
+ goto err_unbind;
+ retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
+ if (retval)
+ goto err_func;
+
+ /* enable host detection and ep0; and we're ready
+ * for set_configuration as well as eventual disconnect.
+ */
+ net2280_led_active(dev, 1);
+
+ if ((dev->quirks & PLX_SUPERSPEED) && !dev->bug7734_patched)
+ defect7374_enable_data_eps_zero(dev);
+
+ ep0_start(dev);
+
+ /* pci writes may still be posted */
+ return 0;
+
+err_func:
+ device_remove_file(&dev->pdev->dev, &dev_attr_function);
+err_unbind:
+ dev->driver = NULL;
+ return retval;
+}
+
+static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
+{
+ int i;
+
+ /* don't disconnect if it's not connected */
+ if (dev->gadget.speed == USB_SPEED_UNKNOWN)
+ driver = NULL;
+
+ /* stop hardware; prevent new request submissions;
+ * and kill any outstanding requests.
+ */
+ usb_reset(dev);
+ for (i = 0; i < dev->n_ep; i++)
+ nuke(&dev->ep[i]);
+
+ /* report disconnect; the driver is already quiesced */
+ if (driver) {
+ spin_unlock(&dev->lock);
+ driver->disconnect(&dev->gadget);
+ spin_lock(&dev->lock);
+ }
+
+ usb_reinit(dev);
+}
+
+static int net2280_stop(struct usb_gadget *_gadget)
+{
+ struct net2280 *dev;
+ unsigned long flags;
+
+ dev = container_of(_gadget, struct net2280, gadget);
+
+ spin_lock_irqsave(&dev->lock, flags);
+ stop_activity(dev, NULL);
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ net2280_led_active(dev, 0);
+
+ device_remove_file(&dev->pdev->dev, &dev_attr_function);
+ device_remove_file(&dev->pdev->dev, &dev_attr_queues);
+
+ dev->driver = NULL;
+
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
+ * also works for dma-capable endpoints, in pio mode or just
+ * to manually advance the queue after short OUT transfers.
+ */
+static void handle_ep_small(struct net2280_ep *ep)
+{
+ struct net2280_request *req;
+ u32 t;
+ /* 0 error, 1 mid-data, 2 done */
+ int mode = 1;
+
+ if (!list_empty(&ep->queue))
+ req = list_entry(ep->queue.next,
+ struct net2280_request, queue);
+ else
+ req = NULL;
+
+ /* ack all, and handle what we care about */
+ t = readl(&ep->regs->ep_stat);
+ ep->irqs++;
+
+ ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
+ ep->ep.name, t, req ? &req->req : NULL);
+
+ if (!ep->is_in || (ep->dev->quirks & PLX_2280))
+ writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
+ else
+ /* Added for 2282 */
+ writel(t, &ep->regs->ep_stat);
+
+ /* for ep0, monitor token irqs to catch data stage length errors
+ * and to synchronize on status.
+ *
+ * also, to defer reporting of protocol stalls ... here's where
+ * data or status first appears, handling stalls here should never
+ * cause trouble on the host side..
+ *
+ * control requests could be slightly faster without token synch for
+ * status, but status can jam up that way.
+ */
+ if (unlikely(ep->num == 0)) {
+ if (ep->is_in) {
+ /* status; stop NAKing */
+ if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
+ if (ep->dev->protocol_stall) {
+ ep->stopped = 1;
+ set_halt(ep);
+ }
+ if (!req)
+ allow_status(ep);
+ mode = 2;
+ /* reply to extra IN data tokens with a zlp */
+ } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
+ if (ep->dev->protocol_stall) {
+ ep->stopped = 1;
+ set_halt(ep);
+ mode = 2;
+ } else if (ep->responded &&
+ !req && !ep->stopped)
+ write_fifo(ep, NULL);
+ }
+ } else {
+ /* status; stop NAKing */
+ if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
+ if (ep->dev->protocol_stall) {
+ ep->stopped = 1;
+ set_halt(ep);
+ }
+ mode = 2;
+ /* an extra OUT token is an error */
+ } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
+ req &&
+ req->req.actual == req->req.length) ||
+ (ep->responded && !req)) {
+ ep->dev->protocol_stall = 1;
+ set_halt(ep);
+ ep->stopped = 1;
+ if (req)
+ done(ep, req, -EOVERFLOW);
+ req = NULL;
+ }
+ }
+ }
+
+ if (unlikely(!req))
+ return;
+
+ /* manual DMA queue advance after short OUT */
+ if (likely(ep->dma)) {
+ if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
+ u32 count;
+ int stopped = ep->stopped;
+
+ /* TRANSFERRED works around OUT_DONE erratum 0112.
+ * we expect (N <= maxpacket) bytes; host wrote M.
+ * iff (M < N) we won't ever see a DMA interrupt.
+ */
+ ep->stopped = 1;
+ for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
+
+ /* any preceding dma transfers must finish.
+ * dma handles (M >= N), may empty the queue
+ */
+ scan_dma_completions(ep);
+ if (unlikely(list_empty(&ep->queue) ||
+ ep->out_overflow)) {
+ req = NULL;
+ break;
+ }
+ req = list_entry(ep->queue.next,
+ struct net2280_request, queue);
+
+ /* here either (M < N), a "real" short rx;
+ * or (M == N) and the queue didn't empty
+ */
+ if (likely(t & BIT(FIFO_EMPTY))) {
+ count = readl(&ep->dma->dmacount);
+ count &= DMA_BYTE_COUNT_MASK;
+ if (readl(&ep->dma->dmadesc)
+ != req->td_dma)
+ req = NULL;
+ break;
+ }
+ udelay(1);
+ }
+
+ /* stop DMA, leave ep NAKing */
+ writel(BIT(DMA_ABORT), &ep->dma->dmastat);
+ spin_stop_dma(ep->dma);
+
+ if (likely(req)) {
+ req->td->dmacount = 0;
+ t = readl(&ep->regs->ep_avail);
+ dma_done(ep, req, count,
+ (ep->out_overflow || t)
+ ? -EOVERFLOW : 0);
+ }
+
+ /* also flush to prevent erratum 0106 trouble */
+ if (unlikely(ep->out_overflow ||
+ (ep->dev->chiprev == 0x0100 &&
+ ep->dev->gadget.speed
+ == USB_SPEED_FULL))) {
+ out_flush(ep);
+ ep->out_overflow = 0;
+ }
+
+ /* (re)start dma if needed, stop NAKing */
+ ep->stopped = stopped;
+ if (!list_empty(&ep->queue))
+ restart_dma(ep);
+ } else
+ ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
+ ep->ep.name, t);
+ return;
+
+ /* data packet(s) received (in the fifo, OUT) */
+ } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
+ if (read_fifo(ep, req) && ep->num != 0)
+ mode = 2;
+
+ /* data packet(s) transmitted (IN) */
+ } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
+ unsigned len;
+
+ len = req->req.length - req->req.actual;
+ if (len > ep->ep.maxpacket)
+ len = ep->ep.maxpacket;
+ req->req.actual += len;
+
+ /* if we wrote it all, we're usually done */
+ /* send zlps until the status stage */
+ if ((req->req.actual == req->req.length) &&
+ (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
+ mode = 2;
+
+ /* there was nothing to do ... */
+ } else if (mode == 1)
+ return;
+
+ /* done */
+ if (mode == 2) {
+ /* stream endpoints often resubmit/unlink in completion */
+ done(ep, req, 0);
+
+ /* maybe advance queue to next request */
+ if (ep->num == 0) {
+ /* NOTE: net2280 could let gadget driver start the
+ * status stage later. since not all controllers let
+ * them control that, the api doesn't (yet) allow it.
+ */
+ if (!ep->stopped)
+ allow_status(ep);
+ req = NULL;
+ } else {
+ if (!list_empty(&ep->queue) && !ep->stopped)
+ req = list_entry(ep->queue.next,
+ struct net2280_request, queue);
+ else
+ req = NULL;
+ if (req && !ep->is_in)
+ stop_out_naking(ep);
+ }
+ }
+
+ /* is there a buffer for the next packet?
+ * for best streaming performance, make sure there is one.
+ */
+ if (req && !ep->stopped) {
+
+ /* load IN fifo with next packet (may be zlp) */
+ if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
+ write_fifo(ep, &req->req);
+ }
+}
+
+static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
+{
+ struct net2280_ep *ep;
+
+ if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
+ return &dev->ep[0];
+ list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
+ u8 bEndpointAddress;
+
+ if (!ep->desc)
+ continue;
+ bEndpointAddress = ep->desc->bEndpointAddress;
+ if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
+ continue;
+ if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
+ return ep;
+ }
+ return NULL;
+}
+
+static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
+{
+ u32 scratch, fsmvalue;
+ u32 ack_wait_timeout, state;
+
+ /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
+ scratch = get_idx_reg(dev->regs, SCRATCH);
+ fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
+ scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
+
+ if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
+ (r.bRequestType & USB_DIR_IN)))
+ return;
+
+ /* This is the first Control Read for this connection: */
+ if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
+ /*
+ * Connection is NOT SS:
+ * - Connection must be FS or HS.
+ * - This FSM state should allow workaround software to
+ * run after the next USB connection.
+ */
+ scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
+ dev->bug7734_patched = 1;
+ goto restore_data_eps;
+ }
+
+ /* Connection is SS: */
+ for (ack_wait_timeout = 0;
+ ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
+ ack_wait_timeout++) {
+
+ state = readl(&dev->plregs->pl_ep_status_1)
+ & (0xff << STATE);
+ if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
+ (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
+ scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
+ dev->bug7734_patched = 1;
+ break;
+ }
+
+ /*
+ * We have not yet received host's Data Phase ACK
+ * - Wait and try again.
+ */
+ udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
+
+ continue;
+ }
+
+
+ if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
+ ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
+ "to detect SS host's data phase ACK.");
+ ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
+ "got 0x%2.2x.\n", state >> STATE);
+ } else {
+ ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
+ "%duSec for Control Read Data Phase ACK\n",
+ DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
+ }
+
+restore_data_eps:
+ /*
+ * Restore data EPs to their pre-workaround settings (disabled,
+ * initialized, and other details).
+ */
+ defect7374_disable_data_eps(dev);
+
+ set_idx_reg(dev->regs, SCRATCH, scratch);
+
+ return;
+}
+
+static void ep_clear_seqnum(struct net2280_ep *ep)
+{
+ struct net2280 *dev = ep->dev;
+ u32 val;
+ static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
+
+ val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
+ val |= ep_pl[ep->num];
+ writel(val, &dev->plregs->pl_ep_ctrl);
+ val |= BIT(SEQUENCE_NUMBER_RESET);
+ writel(val, &dev->plregs->pl_ep_ctrl);
+
+ return;
+}
+
+static void handle_stat0_irqs_superspeed(struct net2280 *dev,
+ struct net2280_ep *ep, struct usb_ctrlrequest r)
+{
+ int tmp = 0;
+
+#define w_value le16_to_cpu(r.wValue)
+#define w_index le16_to_cpu(r.wIndex)
+#define w_length le16_to_cpu(r.wLength)
+
+ switch (r.bRequest) {
+ struct net2280_ep *e;
+ u16 status;
+
+ case USB_REQ_SET_CONFIGURATION:
+ dev->addressed_state = !w_value;
+ goto usb3_delegate;
+
+ case USB_REQ_GET_STATUS:
+ switch (r.bRequestType) {
+ case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
+ status = dev->wakeup_enable ? 0x02 : 0x00;
+ if (dev->gadget.is_selfpowered)
+ status |= BIT(0);
+ status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
+ dev->ltm_enable << 4);
+ writel(0, &dev->epregs[0].ep_irqenb);
+ set_fifo_bytecount(ep, sizeof(status));
+ writel((__force u32) status, &dev->epregs[0].ep_data);
+ allow_status_338x(ep);
+ break;
+
+ case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
+ e = get_ep_by_addr(dev, w_index);
+ if (!e)
+ goto do_stall3;
+ status = readl(&e->regs->ep_rsp) &
+ BIT(CLEAR_ENDPOINT_HALT);
+ writel(0, &dev->epregs[0].ep_irqenb);
+ set_fifo_bytecount(ep, sizeof(status));
+ writel((__force u32) status, &dev->epregs[0].ep_data);
+ allow_status_338x(ep);
+ break;
+
+ default:
+ goto usb3_delegate;
+ }
+ break;
+
+ case USB_REQ_CLEAR_FEATURE:
+ switch (r.bRequestType) {
+ case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
+ if (!dev->addressed_state) {
+ switch (w_value) {
+ case USB_DEVICE_U1_ENABLE:
+ dev->u1_enable = 0;
+ writel(readl(&dev->usb_ext->usbctl2) &
+ ~BIT(U1_ENABLE),
+ &dev->usb_ext->usbctl2);
+ allow_status_338x(ep);
+ goto next_endpoints3;
+
+ case USB_DEVICE_U2_ENABLE:
+ dev->u2_enable = 0;
+ writel(readl(&dev->usb_ext->usbctl2) &
+ ~BIT(U2_ENABLE),
+ &dev->usb_ext->usbctl2);
+ allow_status_338x(ep);
+ goto next_endpoints3;
+
+ case USB_DEVICE_LTM_ENABLE:
+ dev->ltm_enable = 0;
+ writel(readl(&dev->usb_ext->usbctl2) &
+ ~BIT(LTM_ENABLE),
+ &dev->usb_ext->usbctl2);
+ allow_status_338x(ep);
+ goto next_endpoints3;
+
+ default:
+ break;
+ }
+ }
+ if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
+ dev->wakeup_enable = 0;
+ writel(readl(&dev->usb->usbctl) &
+ ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
+ &dev->usb->usbctl);
+ allow_status_338x(ep);
+ break;
+ }
+ goto usb3_delegate;
+
+ case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
+ e = get_ep_by_addr(dev, w_index);
+ if (!e)
+ goto do_stall3;
+ if (w_value != USB_ENDPOINT_HALT)
+ goto do_stall3;
+ ep_vdbg(dev, "%s clear halt\n", e->ep.name);
+ /*
+ * Workaround for SS SeqNum not cleared via
+ * Endpoint Halt (Clear) bit. select endpoint
+ */
+ ep_clear_seqnum(e);
+ clear_halt(e);
+ if (!list_empty(&e->queue) && e->td_dma)
+ restart_dma(e);
+ allow_status(ep);
+ ep->stopped = 1;
+ break;
+
+ default:
+ goto usb3_delegate;
+ }
+ break;
+ case USB_REQ_SET_FEATURE:
+ switch (r.bRequestType) {
+ case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
+ if (!dev->addressed_state) {
+ switch (w_value) {
+ case USB_DEVICE_U1_ENABLE:
+ dev->u1_enable = 1;
+ writel(readl(&dev->usb_ext->usbctl2) |
+ BIT(U1_ENABLE),
+ &dev->usb_ext->usbctl2);
+ allow_status_338x(ep);
+ goto next_endpoints3;
+
+ case USB_DEVICE_U2_ENABLE:
+ dev->u2_enable = 1;
+ writel(readl(&dev->usb_ext->usbctl2) |
+ BIT(U2_ENABLE),
+ &dev->usb_ext->usbctl2);
+ allow_status_338x(ep);
+ goto next_endpoints3;
+
+ case USB_DEVICE_LTM_ENABLE:
+ dev->ltm_enable = 1;
+ writel(readl(&dev->usb_ext->usbctl2) |
+ BIT(LTM_ENABLE),
+ &dev->usb_ext->usbctl2);
+ allow_status_338x(ep);
+ goto next_endpoints3;
+ default:
+ break;
+ }
+ }
+
+ if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
+ dev->wakeup_enable = 1;
+ writel(readl(&dev->usb->usbctl) |
+ BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
+ &dev->usb->usbctl);
+ allow_status_338x(ep);
+ break;
+ }
+ goto usb3_delegate;
+
+ case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
+ e = get_ep_by_addr(dev, w_index);
+ if (!e || (w_value != USB_ENDPOINT_HALT))
+ goto do_stall3;
+ ep->stopped = 1;
+ if (ep->num == 0)
+ ep->dev->protocol_stall = 1;
+ else {
+ if (ep->dma)
+ abort_dma(ep);
+ set_halt(ep);
+ }
+ allow_status_338x(ep);
+ break;
+
+ default:
+ goto usb3_delegate;
+ }
+
+ break;
+ default:
+
+usb3_delegate:
+ ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
+ r.bRequestType, r.bRequest,
+ w_value, w_index, w_length,
+ readl(&ep->cfg->ep_cfg));
+
+ ep->responded = 0;
+ spin_unlock(&dev->lock);
+ tmp = dev->driver->setup(&dev->gadget, &r);
+ spin_lock(&dev->lock);
+ }
+do_stall3:
+ if (tmp < 0) {
+ ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
+ r.bRequestType, r.bRequest, tmp);
+ dev->protocol_stall = 1;
+ /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
+ set_halt(ep);
+ }
+
+next_endpoints3:
+
+#undef w_value
+#undef w_index
+#undef w_length
+
+ return;
+}
+
+static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
+{
+ struct net2280_ep *ep;
+ u32 num, scratch;
+
+ /* most of these don't need individual acks */
+ stat &= ~BIT(INTA_ASSERTED);
+ if (!stat)
+ return;
+ /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
+
+ /* starting a control request? */
+ if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
+ union {
+ u32 raw[2];
+ struct usb_ctrlrequest r;
+ } u;
+ int tmp;
+ struct net2280_request *req;
+
+ if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
+ u32 val = readl(&dev->usb->usbstat);
+ if (val & BIT(SUPER_SPEED)) {
+ dev->gadget.speed = USB_SPEED_SUPER;
+ usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
+ EP0_SS_MAX_PACKET_SIZE);
+ } else if (val & BIT(HIGH_SPEED)) {
+ dev->gadget.speed = USB_SPEED_HIGH;
+ usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
+ EP0_HS_MAX_PACKET_SIZE);
+ } else {
+ dev->gadget.speed = USB_SPEED_FULL;
+ usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
+ EP0_HS_MAX_PACKET_SIZE);
+ }
+ net2280_led_speed(dev, dev->gadget.speed);
+ ep_dbg(dev, "%s\n",
+ usb_speed_string(dev->gadget.speed));
+ }
+
+ ep = &dev->ep[0];
+ ep->irqs++;
+
+ /* make sure any leftover request state is cleared */
+ stat &= ~BIT(ENDPOINT_0_INTERRUPT);
+ while (!list_empty(&ep->queue)) {
+ req = list_entry(ep->queue.next,
+ struct net2280_request, queue);
+ done(ep, req, (req->req.actual == req->req.length)
+ ? 0 : -EPROTO);
+ }
+ ep->stopped = 0;
+ dev->protocol_stall = 0;
+ if (!(dev->quirks & PLX_SUPERSPEED)) {
+ if (ep->dev->quirks & PLX_2280)
+ tmp = BIT(FIFO_OVERFLOW) |
+ BIT(FIFO_UNDERFLOW);
+ else
+ tmp = 0;
+
+ writel(tmp | BIT(TIMEOUT) |
+ BIT(USB_STALL_SENT) |
+ BIT(USB_IN_NAK_SENT) |
+ BIT(USB_IN_ACK_RCVD) |
+ BIT(USB_OUT_PING_NAK_SENT) |
+ BIT(USB_OUT_ACK_SENT) |
+ BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
+ BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
+ BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
+ BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
+ BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
+ BIT(DATA_IN_TOKEN_INTERRUPT),
+ &ep->regs->ep_stat);
+ }
+ u.raw[0] = readl(&dev->usb->setup0123);
+ u.raw[1] = readl(&dev->usb->setup4567);
+
+ cpu_to_le32s(&u.raw[0]);
+ cpu_to_le32s(&u.raw[1]);
+
+ if ((dev->quirks & PLX_SUPERSPEED) && !dev->bug7734_patched)
+ defect7374_workaround(dev, u.r);
+
+ tmp = 0;
+
+#define w_value le16_to_cpu(u.r.wValue)
+#define w_index le16_to_cpu(u.r.wIndex)
+#define w_length le16_to_cpu(u.r.wLength)
+
+ /* ack the irq */
+ writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
+ stat ^= BIT(SETUP_PACKET_INTERRUPT);
+
+ /* watch control traffic at the token level, and force
+ * synchronization before letting the status stage happen.
+ * FIXME ignore tokens we'll NAK, until driver responds.
+ * that'll mean a lot less irqs for some drivers.
+ */
+ ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
+ if (ep->is_in) {
+ scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
+ BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
+ BIT(DATA_IN_TOKEN_INTERRUPT);
+ stop_out_naking(ep);
+ } else
+ scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
+ BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
+ BIT(DATA_IN_TOKEN_INTERRUPT);
+ writel(scratch, &dev->epregs[0].ep_irqenb);
+
+ /* we made the hardware handle most lowlevel requests;
+ * everything else goes uplevel to the gadget code.
+ */
+ ep->responded = 1;
+
+ if (dev->gadget.speed == USB_SPEED_SUPER) {
+ handle_stat0_irqs_superspeed(dev, ep, u.r);
+ goto next_endpoints;
+ }
+
+ switch (u.r.bRequest) {
+ case USB_REQ_GET_STATUS: {
+ struct net2280_ep *e;
+ __le32 status;
+
+ /* hw handles device and interface status */
+ if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
+ goto delegate;
+ e = get_ep_by_addr(dev, w_index);
+ if (!e || w_length > 2)
+ goto do_stall;
+
+ if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
+ status = cpu_to_le32(1);
+ else
+ status = cpu_to_le32(0);
+
+ /* don't bother with a request object! */
+ writel(0, &dev->epregs[0].ep_irqenb);
+ set_fifo_bytecount(ep, w_length);
+ writel((__force u32)status, &dev->epregs[0].ep_data);
+ allow_status(ep);
+ ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
+ goto next_endpoints;
+ }
+ break;
+ case USB_REQ_CLEAR_FEATURE: {
+ struct net2280_ep *e;
+
+ /* hw handles device features */
+ if (u.r.bRequestType != USB_RECIP_ENDPOINT)
+ goto delegate;
+ if (w_value != USB_ENDPOINT_HALT || w_length != 0)
+ goto do_stall;
+ e = get_ep_by_addr(dev, w_index);
+ if (!e)
+ goto do_stall;
+ if (e->wedged) {
+ ep_vdbg(dev, "%s wedged, halt not cleared\n",
+ ep->ep.name);
+ } else {
+ ep_vdbg(dev, "%s clear halt\n", e->ep.name);
+ clear_halt(e);
+ if ((ep->dev->quirks & PLX_SUPERSPEED) &&
+ !list_empty(&e->queue) && e->td_dma)
+ restart_dma(e);
+ }
+ allow_status(ep);
+ goto next_endpoints;
+ }
+ break;
+ case USB_REQ_SET_FEATURE: {
+ struct net2280_ep *e;
+
+ /* hw handles device features */
+ if (u.r.bRequestType != USB_RECIP_ENDPOINT)
+ goto delegate;
+ if (w_value != USB_ENDPOINT_HALT || w_length != 0)
+ goto do_stall;
+ e = get_ep_by_addr(dev, w_index);
+ if (!e)
+ goto do_stall;
+ if (e->ep.name == ep0name)
+ goto do_stall;
+ set_halt(e);
+ if ((dev->quirks & PLX_SUPERSPEED) && e->dma)
+ abort_dma(e);
+ allow_status(ep);
+ ep_vdbg(dev, "%s set halt\n", ep->ep.name);
+ goto next_endpoints;
+ }
+ break;
+ default:
+delegate:
+ ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
+ "ep_cfg %08x\n",
+ u.r.bRequestType, u.r.bRequest,
+ w_value, w_index, w_length,
+ readl(&ep->cfg->ep_cfg));
+ ep->responded = 0;
+ spin_unlock(&dev->lock);
+ tmp = dev->driver->setup(&dev->gadget, &u.r);
+ spin_lock(&dev->lock);
+ }
+
+ /* stall ep0 on error */
+ if (tmp < 0) {
+do_stall:
+ ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
+ u.r.bRequestType, u.r.bRequest, tmp);
+ dev->protocol_stall = 1;
+ }
+
+ /* some in/out token irq should follow; maybe stall then.
+ * driver must queue a request (even zlp) or halt ep0
+ * before the host times out.
+ */
+ }
+
+#undef w_value
+#undef w_index
+#undef w_length
+
+next_endpoints:
+ /* endpoint data irq ? */
+ scratch = stat & 0x7f;
+ stat &= ~0x7f;
+ for (num = 0; scratch; num++) {
+ u32 t;
+
+ /* do this endpoint's FIFO and queue need tending? */
+ t = BIT(num);
+ if ((scratch & t) == 0)
+ continue;
+ scratch ^= t;
+
+ ep = &dev->ep[num];
+ handle_ep_small(ep);
+ }
+
+ if (stat)
+ ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
+}
+
+#define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
+ BIT(DMA_C_INTERRUPT) | \
+ BIT(DMA_B_INTERRUPT) | \
+ BIT(DMA_A_INTERRUPT))
+#define PCI_ERROR_INTERRUPTS ( \
+ BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
+ BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
+ BIT(PCI_RETRY_ABORT_INTERRUPT))
+
+static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
+__releases(dev->lock)
+__acquires(dev->lock)
+{
+ struct net2280_ep *ep;
+ u32 tmp, num, mask, scratch;
+
+ /* after disconnect there's nothing else to do! */
+ tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
+ mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
+
+ /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
+ * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
+ * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
+ * only indicates a change in the reset state).
+ */
+ if (stat & tmp) {
+ bool reset = false;
+ bool disconnect = false;
+
+ /*
+ * Ignore disconnects and resets if the speed hasn't been set.
+ * VBUS can bounce and there's always an initial reset.
+ */
+ writel(tmp, &dev->regs->irqstat1);
+ if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
+ if ((stat & BIT(VBUS_INTERRUPT)) &&
+ (readl(&dev->usb->usbctl) &
+ BIT(VBUS_PIN)) == 0) {
+ disconnect = true;
+ ep_dbg(dev, "disconnect %s\n",
+ dev->driver->driver.name);
+ } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
+ (readl(&dev->usb->usbstat) & mask)
+ == 0) {
+ reset = true;
+ ep_dbg(dev, "reset %s\n",
+ dev->driver->driver.name);
+ }
+
+ if (disconnect || reset) {
+ stop_activity(dev, dev->driver);
+ ep0_start(dev);
+ spin_unlock(&dev->lock);
+ if (reset)
+ usb_gadget_udc_reset
+ (&dev->gadget, dev->driver);
+ else
+ (dev->driver->disconnect)
+ (&dev->gadget);
+ spin_lock(&dev->lock);
+ return;
+ }
+ }
+ stat &= ~tmp;
+
+ /* vBUS can bounce ... one of many reasons to ignore the
+ * notion of hotplug events on bus connect/disconnect!
+ */
+ if (!stat)
+ return;
+ }
+
+ /* NOTE: chip stays in PCI D0 state for now, but it could
+ * enter D1 to save more power
+ */
+ tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
+ if (stat & tmp) {
+ writel(tmp, &dev->regs->irqstat1);
+ if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
+ if (dev->driver->suspend)
+ dev->driver->suspend(&dev->gadget);
+ if (!enable_suspend)
+ stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
+ } else {
+ if (dev->driver->resume)
+ dev->driver->resume(&dev->gadget);
+ /* at high speed, note erratum 0133 */
+ }
+ stat &= ~tmp;
+ }
+
+ /* clear any other status/irqs */
+ if (stat)
+ writel(stat, &dev->regs->irqstat1);
+
+ /* some status we can just ignore */
+ if (dev->quirks & PLX_2280)
+ stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
+ BIT(SUSPEND_REQUEST_INTERRUPT) |
+ BIT(RESUME_INTERRUPT) |
+ BIT(SOF_INTERRUPT));
+ else
+ stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
+ BIT(RESUME_INTERRUPT) |
+ BIT(SOF_DOWN_INTERRUPT) |
+ BIT(SOF_INTERRUPT));
+
+ if (!stat)
+ return;
+ /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
+
+ /* DMA status, for ep-{a,b,c,d} */
+ scratch = stat & DMA_INTERRUPTS;
+ stat &= ~DMA_INTERRUPTS;
+ scratch >>= 9;
+ for (num = 0; scratch; num++) {
+ struct net2280_dma_regs __iomem *dma;
+
+ tmp = BIT(num);
+ if ((tmp & scratch) == 0)
+ continue;
+ scratch ^= tmp;
+
+ ep = &dev->ep[num + 1];
+ dma = ep->dma;
+
+ if (!dma)
+ continue;
+
+ /* clear ep's dma status */
+ tmp = readl(&dma->dmastat);
+ writel(tmp, &dma->dmastat);
+
+ /* dma sync*/
+ if (dev->quirks & PLX_SUPERSPEED) {
+ u32 r_dmacount = readl(&dma->dmacount);
+ if (!ep->is_in && (r_dmacount & 0x00FFFFFF) &&
+ (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
+ continue;
+ }
+
+ if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
+ ep_dbg(ep->dev, "%s no xact done? %08x\n",
+ ep->ep.name, tmp);
+ continue;
+ }
+ stop_dma(ep->dma);
+
+ /* OUT transfers terminate when the data from the
+ * host is in our memory. Process whatever's done.
+ * On this path, we know transfer's last packet wasn't
+ * less than req->length. NAK_OUT_PACKETS may be set,
+ * or the FIFO may already be holding new packets.
+ *
+ * IN transfers can linger in the FIFO for a very
+ * long time ... we ignore that for now, accounting
+ * precisely (like PIO does) needs per-packet irqs
+ */
+ scan_dma_completions(ep);
+
+ /* disable dma on inactive queues; else maybe restart */
+ if (!list_empty(&ep->queue)) {
+ tmp = readl(&dma->dmactl);
+ restart_dma(ep);
+ }
+ ep->irqs++;
+ }
+
+ /* NOTE: there are other PCI errors we might usefully notice.
+ * if they appear very often, here's where to try recovering.
+ */
+ if (stat & PCI_ERROR_INTERRUPTS) {
+ ep_err(dev, "pci dma error; stat %08x\n", stat);
+ stat &= ~PCI_ERROR_INTERRUPTS;
+ /* these are fatal errors, but "maybe" they won't
+ * happen again ...
+ */
+ stop_activity(dev, dev->driver);
+ ep0_start(dev);
+ stat = 0;
+ }
+
+ if (stat)
+ ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
+}
+
+static irqreturn_t net2280_irq(int irq, void *_dev)
+{
+ struct net2280 *dev = _dev;
+
+ /* shared interrupt, not ours */
+ if ((dev->quirks & PLX_LEGACY) &&
+ (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
+ return IRQ_NONE;
+
+ spin_lock(&dev->lock);
+
+ /* handle disconnect, dma, and more */
+ handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
+
+ /* control requests and PIO */
+ handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
+
+ if (dev->quirks & PLX_SUPERSPEED) {
+ /* re-enable interrupt to trigger any possible new interrupt */
+ u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
+ writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
+ writel(pciirqenb1, &dev->regs->pciirqenb1);
+ }
+
+ spin_unlock(&dev->lock);
+
+ return IRQ_HANDLED;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void gadget_release(struct device *_dev)
+{
+ struct net2280 *dev = dev_get_drvdata(_dev);
+
+ kfree(dev);
+}
+
+/* tear down the binding between this driver and the pci device */
+
+static void net2280_remove(struct pci_dev *pdev)
+{
+ struct net2280 *dev = pci_get_drvdata(pdev);
+
+ usb_del_gadget_udc(&dev->gadget);
+
+ BUG_ON(dev->driver);
+
+ /* then clean up the resources we allocated during probe() */
+ net2280_led_shutdown(dev);
+ if (dev->requests) {
+ int i;
+ for (i = 1; i < 5; i++) {
+ if (!dev->ep[i].dummy)
+ continue;
+ pci_pool_free(dev->requests, dev->ep[i].dummy,
+ dev->ep[i].td_dma);
+ }
+ pci_pool_destroy(dev->requests);
+ }
+ if (dev->got_irq)
+ free_irq(pdev->irq, dev);
+ if (dev->quirks & PLX_SUPERSPEED)
+ pci_disable_msi(pdev);
+ if (dev->regs)
+ iounmap(dev->regs);
+ if (dev->region)
+ release_mem_region(pci_resource_start(pdev, 0),
+ pci_resource_len(pdev, 0));
+ if (dev->enabled)
+ pci_disable_device(pdev);
+ device_remove_file(&pdev->dev, &dev_attr_registers);
+
+ ep_info(dev, "unbind\n");
+}
+
+/* wrap this driver around the specified device, but
+ * don't respond over USB until a gadget driver binds to us.
+ */
+
+static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct net2280 *dev;
+ unsigned long resource, len;
+ void __iomem *base = NULL;
+ int retval, i;
+
+ /* alloc, and start init */
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (dev == NULL) {
+ retval = -ENOMEM;
+ goto done;
+ }
+
+ pci_set_drvdata(pdev, dev);
+ spin_lock_init(&dev->lock);
+ dev->quirks = id->driver_data;
+ dev->pdev = pdev;
+ dev->gadget.ops = &net2280_ops;
+ dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
+ USB_SPEED_SUPER : USB_SPEED_HIGH;
+
+ /* the "gadget" abstracts/virtualizes the controller */
+ dev->gadget.name = driver_name;
+
+ /* now all the pci goodies ... */
+ if (pci_enable_device(pdev) < 0) {
+ retval = -ENODEV;
+ goto done;
+ }
+ dev->enabled = 1;
+
+ /* BAR 0 holds all the registers
+ * BAR 1 is 8051 memory; unused here (note erratum 0103)
+ * BAR 2 is fifo memory; unused here
+ */
+ resource = pci_resource_start(pdev, 0);
+ len = pci_resource_len(pdev, 0);
+ if (!request_mem_region(resource, len, driver_name)) {
+ ep_dbg(dev, "controller already in use\n");
+ retval = -EBUSY;
+ goto done;
+ }
+ dev->region = 1;
+
+ /* FIXME provide firmware download interface to put
+ * 8051 code into the chip, e.g. to turn on PCI PM.
+ */
+
+ base = ioremap_nocache(resource, len);
+ if (base == NULL) {
+ ep_dbg(dev, "can't map memory\n");
+ retval = -EFAULT;
+ goto done;
+ }
+ dev->regs = (struct net2280_regs __iomem *) base;
+ dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
+ dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
+ dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
+ dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
+ dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
+
+ if (dev->quirks & PLX_SUPERSPEED) {
+ u32 fsmvalue;
+ u32 usbstat;
+ dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
+ (base + 0x00b4);
+ dev->llregs = (struct usb338x_ll_regs __iomem *)
+ (base + 0x0700);
+ dev->ll_lfps_regs = (struct usb338x_ll_lfps_regs __iomem *)
+ (base + 0x0748);
+ dev->ll_tsn_regs = (struct usb338x_ll_tsn_regs __iomem *)
+ (base + 0x077c);
+ dev->ll_chicken_reg = (struct usb338x_ll_chi_regs __iomem *)
+ (base + 0x079c);
+ dev->plregs = (struct usb338x_pl_regs __iomem *)
+ (base + 0x0800);
+ usbstat = readl(&dev->usb->usbstat);
+ dev->enhanced_mode = !!(usbstat & BIT(11));
+ dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
+ /* put into initial config, link up all endpoints */
+ fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
+ (0xf << DEFECT7374_FSM_FIELD);
+ /* See if firmware needs to set up for workaround: */
+ if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
+ dev->bug7734_patched = 1;
+ writel(0, &dev->usb->usbctl);
+ } else
+ dev->bug7734_patched = 0;
+ } else {
+ dev->enhanced_mode = 0;
+ dev->n_ep = 7;
+ /* put into initial config, link up all endpoints */
+ writel(0, &dev->usb->usbctl);
+ }
+
+ usb_reset(dev);
+ usb_reinit(dev);
+
+ /* irq setup after old hardware is cleaned up */
+ if (!pdev->irq) {
+ ep_err(dev, "No IRQ. Check PCI setup!\n");
+ retval = -ENODEV;
+ goto done;
+ }
+
+ if (dev->quirks & PLX_SUPERSPEED)
+ if (pci_enable_msi(pdev))
+ ep_err(dev, "Failed to enable MSI mode\n");
+
+ if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
+ driver_name, dev)) {
+ ep_err(dev, "request interrupt %d failed\n", pdev->irq);
+ retval = -EBUSY;
+ goto done;
+ }
+ dev->got_irq = 1;
+
+ /* DMA setup */
+ /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */
+ dev->requests = pci_pool_create("requests", pdev,
+ sizeof(struct net2280_dma),
+ 0 /* no alignment requirements */,
+ 0 /* or page-crossing issues */);
+ if (!dev->requests) {
+ ep_dbg(dev, "can't get request pool\n");
+ retval = -ENOMEM;
+ goto done;
+ }
+ for (i = 1; i < 5; i++) {
+ struct net2280_dma *td;
+
+ td = pci_pool_alloc(dev->requests, GFP_KERNEL,
+ &dev->ep[i].td_dma);
+ if (!td) {
+ ep_dbg(dev, "can't get dummy %d\n", i);
+ retval = -ENOMEM;
+ goto done;
+ }
+ td->dmacount = 0; /* not VALID */
+ td->dmadesc = td->dmaaddr;
+ dev->ep[i].dummy = td;
+ }
+
+ /* enable lower-overhead pci memory bursts during DMA */
+ if (dev->quirks & PLX_LEGACY)
+ writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
+ /*
+ * 256 write retries may not be enough...
+ BIT(PCI_RETRY_ABORT_ENABLE) |
+ */
+ BIT(DMA_READ_MULTIPLE_ENABLE) |
+ BIT(DMA_READ_LINE_ENABLE),
+ &dev->pci->pcimstctl);
+ /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
+ pci_set_master(pdev);
+ pci_try_set_mwi(pdev);
+
+ /* ... also flushes any posted pci writes */
+ dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
+
+ /* done */
+ ep_info(dev, "%s\n", driver_desc);
+ ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
+ pdev->irq, base, dev->chiprev);
+ ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
+ dev->enhanced_mode ? "enhanced mode" : "legacy mode");
+ retval = device_create_file(&pdev->dev, &dev_attr_registers);
+ if (retval)
+ goto done;
+
+ retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
+ gadget_release);
+ if (retval)
+ goto done;
+ return 0;
+
+done:
+ if (dev)
+ net2280_remove(pdev);
+ return retval;
+}
+
+/* make sure the board is quiescent; otherwise it will continue
+ * generating IRQs across the upcoming reboot.
+ */
+
+static void net2280_shutdown(struct pci_dev *pdev)
+{
+ struct net2280 *dev = pci_get_drvdata(pdev);
+
+ /* disable IRQs */
+ writel(0, &dev->regs->pciirqenb0);
+ writel(0, &dev->regs->pciirqenb1);
+
+ /* disable the pullup so the host will think we're gone */
+ writel(0, &dev->usb->usbctl);
+
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static const struct pci_device_id pci_ids[] = { {
+ .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
+ .class_mask = ~0,
+ .vendor = PCI_VENDOR_ID_PLX_LEGACY,
+ .device = 0x2280,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = PLX_LEGACY | PLX_2280,
+ }, {
+ .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
+ .class_mask = ~0,
+ .vendor = PCI_VENDOR_ID_PLX_LEGACY,
+ .device = 0x2282,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = PLX_LEGACY,
+ },
+ {
+ .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
+ .class_mask = ~0,
+ .vendor = PCI_VENDOR_ID_PLX,
+ .device = 0x3380,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = PLX_SUPERSPEED,
+ },
+ {
+ .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
+ .class_mask = ~0,
+ .vendor = PCI_VENDOR_ID_PLX,
+ .device = 0x3382,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = PLX_SUPERSPEED,
+ },
+{ /* end: all zeroes */ }
+};
+MODULE_DEVICE_TABLE(pci, pci_ids);
+
+/* pci driver glue; this is a "new style" PCI driver module */
+static struct pci_driver net2280_pci_driver = {
+ .name = (char *) driver_name,
+ .id_table = pci_ids,
+
+ .probe = net2280_probe,
+ .remove = net2280_remove,
+ .shutdown = net2280_shutdown,
+
+ /* FIXME add power management support */
+};
+
+module_pci_driver(net2280_pci_driver);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("David Brownell");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff