--- /dev/null
+/*
+ * MSM MDDI Transport
+ *
+ * Copyright (C) 2007 Google Incorporated
+ * Copyright (C) 2007 QUALCOMM Incorporated
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/gfp.h>
+#include <linux/spinlock.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/sched.h>
+#include <linux/platform_data/video-msm_fb.h>
+#include "mddi_hw.h"
+
+#define FLAG_DISABLE_HIBERNATION 0x0001
+#define FLAG_HAVE_CAPS 0x0002
+#define FLAG_HAS_VSYNC_IRQ 0x0004
+#define FLAG_HAVE_STATUS 0x0008
+
+#define CMD_GET_CLIENT_CAP 0x0601
+#define CMD_GET_CLIENT_STATUS 0x0602
+
+union mddi_rev {
+ unsigned char raw[MDDI_REV_BUFFER_SIZE];
+ struct mddi_rev_packet hdr;
+ struct mddi_client_status status;
+ struct mddi_client_caps caps;
+ struct mddi_register_access reg;
+};
+
+struct reg_read_info {
+ struct completion done;
+ uint32_t reg;
+ uint32_t status;
+ uint32_t result;
+};
+
+struct mddi_info {
+ uint16_t flags;
+ uint16_t version;
+ char __iomem *base;
+ int irq;
+ struct clk *clk;
+ struct msm_mddi_client_data client_data;
+
+ /* buffer for rev encap packets */
+ void *rev_data;
+ dma_addr_t rev_addr;
+ struct mddi_llentry *reg_write_data;
+ dma_addr_t reg_write_addr;
+ struct mddi_llentry *reg_read_data;
+ dma_addr_t reg_read_addr;
+ size_t rev_data_curr;
+
+ spinlock_t int_lock;
+ uint32_t int_enable;
+ uint32_t got_int;
+ wait_queue_head_t int_wait;
+
+ struct mutex reg_write_lock;
+ struct mutex reg_read_lock;
+ struct reg_read_info *reg_read;
+
+ struct mddi_client_caps caps;
+ struct mddi_client_status status;
+
+ void (*power_client)(struct msm_mddi_client_data *, int);
+
+ /* client device published to bind us to the
+ * appropriate mddi_client driver
+ */
+ char client_name[20];
+
+ struct platform_device client_pdev;
+};
+
+static void mddi_init_rev_encap(struct mddi_info *mddi);
+
+#define mddi_readl(r) readl(mddi->base + (MDDI_##r))
+#define mddi_writel(v, r) writel((v), mddi->base + (MDDI_##r))
+
+void mddi_activate_link(struct msm_mddi_client_data *cdata)
+{
+ struct mddi_info *mddi = container_of(cdata, struct mddi_info,
+ client_data);
+
+ mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD);
+}
+
+static void mddi_handle_link_list_done(struct mddi_info *mddi)
+{
+}
+
+static void mddi_reset_rev_encap_ptr(struct mddi_info *mddi)
+{
+ printk(KERN_INFO "mddi: resetting rev ptr\n");
+ mddi->rev_data_curr = 0;
+ mddi_writel(mddi->rev_addr, REV_PTR);
+ mddi_writel(mddi->rev_addr, REV_PTR);
+ mddi_writel(MDDI_CMD_FORCE_NEW_REV_PTR, CMD);
+}
+
+static void mddi_handle_rev_data(struct mddi_info *mddi, union mddi_rev *rev)
+{
+ int i;
+ struct reg_read_info *ri;
+
+ if ((rev->hdr.length <= MDDI_REV_BUFFER_SIZE - 2) &&
+ (rev->hdr.length >= sizeof(struct mddi_rev_packet) - 2)) {
+
+ switch (rev->hdr.type) {
+ case TYPE_CLIENT_CAPS:
+ memcpy(&mddi->caps, &rev->caps,
+ sizeof(struct mddi_client_caps));
+ mddi->flags |= FLAG_HAVE_CAPS;
+ wake_up(&mddi->int_wait);
+ break;
+ case TYPE_CLIENT_STATUS:
+ memcpy(&mddi->status, &rev->status,
+ sizeof(struct mddi_client_status));
+ mddi->flags |= FLAG_HAVE_STATUS;
+ wake_up(&mddi->int_wait);
+ break;
+ case TYPE_REGISTER_ACCESS:
+ ri = mddi->reg_read;
+ if (ri == 0) {
+ printk(KERN_INFO "rev: got reg %x = %x without "
+ " pending read\n",
+ rev->reg.register_address,
+ rev->reg.register_data_list);
+ break;
+ }
+ if (ri->reg != rev->reg.register_address) {
+ printk(KERN_INFO "rev: got reg %x = %x for "
+ "wrong register, expected "
+ "%x\n",
+ rev->reg.register_address,
+ rev->reg.register_data_list, ri->reg);
+ break;
+ }
+ mddi->reg_read = NULL;
+ ri->status = 0;
+ ri->result = rev->reg.register_data_list;
+ complete(&ri->done);
+ break;
+ default:
+ printk(KERN_INFO "rev: unknown reverse packet: "
+ "len=%04x type=%04x CURR_REV_PTR=%x\n",
+ rev->hdr.length, rev->hdr.type,
+ mddi_readl(CURR_REV_PTR));
+ for (i = 0; i < rev->hdr.length + 2; i++) {
+ if ((i % 16) == 0)
+ printk(KERN_INFO "\n");
+ printk(KERN_INFO " %02x", rev->raw[i]);
+ }
+ printk(KERN_INFO "\n");
+ mddi_reset_rev_encap_ptr(mddi);
+ }
+ } else {
+ printk(KERN_INFO "bad rev length, %d, CURR_REV_PTR %x\n",
+ rev->hdr.length, mddi_readl(CURR_REV_PTR));
+ mddi_reset_rev_encap_ptr(mddi);
+ }
+}
+
+static void mddi_wait_interrupt(struct mddi_info *mddi, uint32_t intmask);
+
+static void mddi_handle_rev_data_avail(struct mddi_info *mddi)
+{
+ uint32_t rev_data_count;
+ uint32_t rev_crc_err_count;
+ struct reg_read_info *ri;
+ size_t prev_offset;
+ uint16_t length;
+
+ union mddi_rev *crev = mddi->rev_data + mddi->rev_data_curr;
+
+ /* clear the interrupt */
+ mddi_writel(MDDI_INT_REV_DATA_AVAIL, INT);
+ rev_data_count = mddi_readl(REV_PKT_CNT);
+ rev_crc_err_count = mddi_readl(REV_CRC_ERR);
+ if (rev_data_count > 1)
+ printk(KERN_INFO "rev_data_count %d\n", rev_data_count);
+
+ if (rev_crc_err_count) {
+ printk(KERN_INFO "rev_crc_err_count %d, INT %x\n",
+ rev_crc_err_count, mddi_readl(INT));
+ ri = mddi->reg_read;
+ if (ri == 0) {
+ printk(KERN_INFO "rev: got crc error without pending "
+ "read\n");
+ } else {
+ mddi->reg_read = NULL;
+ ri->status = -EIO;
+ ri->result = -1;
+ complete(&ri->done);
+ }
+ }
+
+ if (rev_data_count == 0)
+ return;
+
+ prev_offset = mddi->rev_data_curr;
+
+ length = *((uint8_t *)mddi->rev_data + mddi->rev_data_curr);
+ mddi->rev_data_curr++;
+ if (mddi->rev_data_curr == MDDI_REV_BUFFER_SIZE)
+ mddi->rev_data_curr = 0;
+ length += *((uint8_t *)mddi->rev_data + mddi->rev_data_curr) << 8;
+ mddi->rev_data_curr += 1 + length;
+ if (mddi->rev_data_curr >= MDDI_REV_BUFFER_SIZE)
+ mddi->rev_data_curr =
+ mddi->rev_data_curr % MDDI_REV_BUFFER_SIZE;
+
+ if (length > MDDI_REV_BUFFER_SIZE - 2) {
+ printk(KERN_INFO "mddi: rev data length greater than buffer"
+ "size\n");
+ mddi_reset_rev_encap_ptr(mddi);
+ return;
+ }
+
+ if (prev_offset + 2 + length >= MDDI_REV_BUFFER_SIZE) {
+ union mddi_rev tmprev;
+ size_t rem = MDDI_REV_BUFFER_SIZE - prev_offset;
+ memcpy(&tmprev.raw[0], mddi->rev_data + prev_offset, rem);
+ memcpy(&tmprev.raw[rem], mddi->rev_data, 2 + length - rem);
+ mddi_handle_rev_data(mddi, &tmprev);
+ } else {
+ mddi_handle_rev_data(mddi, crev);
+ }
+
+ if (prev_offset < MDDI_REV_BUFFER_SIZE / 2 &&
+ mddi->rev_data_curr >= MDDI_REV_BUFFER_SIZE / 2) {
+ mddi_writel(mddi->rev_addr, REV_PTR);
+ }
+}
+
+static irqreturn_t mddi_isr(int irq, void *data)
+{
+ struct msm_mddi_client_data *cdata = data;
+ struct mddi_info *mddi = container_of(cdata, struct mddi_info,
+ client_data);
+ uint32_t active, status;
+
+ spin_lock(&mddi->int_lock);
+
+ active = mddi_readl(INT);
+ status = mddi_readl(STAT);
+
+ mddi_writel(active, INT);
+
+ /* ignore any interrupts we have disabled */
+ active &= mddi->int_enable;
+
+ mddi->got_int |= active;
+ wake_up(&mddi->int_wait);
+
+ if (active & MDDI_INT_PRI_LINK_LIST_DONE) {
+ mddi->int_enable &= (~MDDI_INT_PRI_LINK_LIST_DONE);
+ mddi_handle_link_list_done(mddi);
+ }
+ if (active & MDDI_INT_REV_DATA_AVAIL)
+ mddi_handle_rev_data_avail(mddi);
+
+ if (active & ~MDDI_INT_NEED_CLEAR)
+ mddi->int_enable &= ~(active & ~MDDI_INT_NEED_CLEAR);
+
+ if (active & MDDI_INT_LINK_ACTIVE) {
+ mddi->int_enable &= (~MDDI_INT_LINK_ACTIVE);
+ mddi->int_enable |= MDDI_INT_IN_HIBERNATION;
+ }
+
+ if (active & MDDI_INT_IN_HIBERNATION) {
+ mddi->int_enable &= (~MDDI_INT_IN_HIBERNATION);
+ mddi->int_enable |= MDDI_INT_LINK_ACTIVE;
+ }
+
+ mddi_writel(mddi->int_enable, INTEN);
+ spin_unlock(&mddi->int_lock);
+
+ return IRQ_HANDLED;
+}
+
+static long mddi_wait_interrupt_timeout(struct mddi_info *mddi,
+ uint32_t intmask, int timeout)
+{
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&mddi->int_lock, irq_flags);
+ mddi->got_int &= ~intmask;
+ mddi->int_enable |= intmask;
+ mddi_writel(mddi->int_enable, INTEN);
+ spin_unlock_irqrestore(&mddi->int_lock, irq_flags);
+ return wait_event_timeout(mddi->int_wait, mddi->got_int & intmask,
+ timeout);
+}
+
+static void mddi_wait_interrupt(struct mddi_info *mddi, uint32_t intmask)
+{
+ if (mddi_wait_interrupt_timeout(mddi, intmask, HZ/10) == 0)
+ printk(KERN_INFO "mddi_wait_interrupt %d, timeout "
+ "waiting for %x, INT = %x, STAT = %x gotint = %x\n",
+ current->pid, intmask, mddi_readl(INT), mddi_readl(STAT),
+ mddi->got_int);
+}
+
+static void mddi_init_rev_encap(struct mddi_info *mddi)
+{
+ memset(mddi->rev_data, 0xee, MDDI_REV_BUFFER_SIZE);
+ mddi_writel(mddi->rev_addr, REV_PTR);
+ mddi_writel(MDDI_CMD_FORCE_NEW_REV_PTR, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+}
+
+void mddi_set_auto_hibernate(struct msm_mddi_client_data *cdata, int on)
+{
+ struct mddi_info *mddi = container_of(cdata, struct mddi_info,
+ client_data);
+ mddi_writel(MDDI_CMD_POWERDOWN, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_IN_HIBERNATION);
+ mddi_writel(MDDI_CMD_HIBERNATE | !!on, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+}
+
+
+static uint16_t mddi_init_registers(struct mddi_info *mddi)
+{
+ mddi_writel(0x0001, VERSION);
+ mddi_writel(MDDI_HOST_BYTES_PER_SUBFRAME, BPS);
+ mddi_writel(0x0003, SPM); /* subframes per media */
+ mddi_writel(0x0005, TA1_LEN);
+ mddi_writel(MDDI_HOST_TA2_LEN, TA2_LEN);
+ mddi_writel(0x0096, DRIVE_HI);
+ /* 0x32 normal, 0x50 for Toshiba display */
+ mddi_writel(0x0050, DRIVE_LO);
+ mddi_writel(0x003C, DISP_WAKE); /* wakeup counter */
+ mddi_writel(MDDI_HOST_REV_RATE_DIV, REV_RATE_DIV);
+
+ mddi_writel(MDDI_REV_BUFFER_SIZE, REV_SIZE);
+ mddi_writel(MDDI_MAX_REV_PKT_SIZE, REV_ENCAP_SZ);
+
+ /* disable periodic rev encap */
+ mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+
+ if (mddi_readl(PAD_CTL) == 0) {
+ /* If we are turning on band gap, need to wait 5us before
+ * turning on the rest of the PAD */
+ mddi_writel(0x08000, PAD_CTL);
+ udelay(5);
+ }
+
+ /* Recommendation from PAD hw team */
+ mddi_writel(0xa850f, PAD_CTL);
+
+
+ /* Need an even number for counts */
+ mddi_writel(0x60006, DRIVER_START_CNT);
+
+ mddi_set_auto_hibernate(&mddi->client_data, 0);
+
+ mddi_writel(MDDI_CMD_DISP_IGNORE, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+
+ mddi_init_rev_encap(mddi);
+ return mddi_readl(CORE_VER) & 0xffff;
+}
+
+static void mddi_suspend(struct msm_mddi_client_data *cdata)
+{
+ struct mddi_info *mddi = container_of(cdata, struct mddi_info,
+ client_data);
+ /* turn off the client */
+ if (mddi->power_client)
+ mddi->power_client(&mddi->client_data, 0);
+ /* turn off the link */
+ mddi_writel(MDDI_CMD_RESET, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+ /* turn off the clock */
+ clk_disable(mddi->clk);
+}
+
+static void mddi_resume(struct msm_mddi_client_data *cdata)
+{
+ struct mddi_info *mddi = container_of(cdata, struct mddi_info,
+ client_data);
+ mddi_set_auto_hibernate(&mddi->client_data, 0);
+ /* turn on the client */
+ if (mddi->power_client)
+ mddi->power_client(&mddi->client_data, 1);
+ /* turn on the clock */
+ clk_enable(mddi->clk);
+ /* set up the local registers */
+ mddi->rev_data_curr = 0;
+ mddi_init_registers(mddi);
+ mddi_writel(mddi->int_enable, INTEN);
+ mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD);
+ mddi_writel(MDDI_CMD_SEND_RTD, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+ mddi_set_auto_hibernate(&mddi->client_data, 1);
+}
+
+static int mddi_get_client_caps(struct mddi_info *mddi)
+{
+ int i, j;
+
+ /* clear any stale interrupts */
+ mddi_writel(0xffffffff, INT);
+
+ mddi->int_enable = MDDI_INT_LINK_ACTIVE |
+ MDDI_INT_IN_HIBERNATION |
+ MDDI_INT_PRI_LINK_LIST_DONE |
+ MDDI_INT_REV_DATA_AVAIL |
+ MDDI_INT_REV_OVERFLOW |
+ MDDI_INT_REV_OVERWRITE |
+ MDDI_INT_RTD_FAILURE;
+ mddi_writel(mddi->int_enable, INTEN);
+
+ mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+
+ for (j = 0; j < 3; j++) {
+ /* the toshiba vga panel does not respond to get
+ * caps unless you SEND_RTD, but the first SEND_RTD
+ * will fail...
+ */
+ for (i = 0; i < 4; i++) {
+ uint32_t stat;
+
+ mddi_writel(MDDI_CMD_SEND_RTD, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+ stat = mddi_readl(STAT);
+ printk(KERN_INFO "mddi cmd send rtd: int %x, stat %x, "
+ "rtd val %x\n", mddi_readl(INT), stat,
+ mddi_readl(RTD_VAL));
+ if ((stat & MDDI_STAT_RTD_MEAS_FAIL) == 0)
+ break;
+ msleep(1);
+ }
+
+ mddi_writel(CMD_GET_CLIENT_CAP, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+ wait_event_timeout(mddi->int_wait, mddi->flags & FLAG_HAVE_CAPS,
+ HZ / 100);
+
+ if (mddi->flags & FLAG_HAVE_CAPS)
+ break;
+ printk(KERN_INFO "mddi_init, timeout waiting for caps\n");
+ }
+ return mddi->flags & FLAG_HAVE_CAPS;
+}
+
+/* link must be active when this is called */
+int mddi_check_status(struct mddi_info *mddi)
+{
+ int ret = -1, retry = 3;
+ mutex_lock(&mddi->reg_read_lock);
+ mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 1, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+
+ do {
+ mddi->flags &= ~FLAG_HAVE_STATUS;
+ mddi_writel(CMD_GET_CLIENT_STATUS, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+ wait_event_timeout(mddi->int_wait,
+ mddi->flags & FLAG_HAVE_STATUS,
+ HZ / 100);
+
+ if (mddi->flags & FLAG_HAVE_STATUS) {
+ if (mddi->status.crc_error_count)
+ printk(KERN_INFO "mddi status: crc_error "
+ "count: %d\n",
+ mddi->status.crc_error_count);
+ else
+ ret = 0;
+ break;
+ } else
+ printk(KERN_INFO "mddi status: failed to get client "
+ "status\n");
+ mddi_writel(MDDI_CMD_SEND_RTD, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+ } while (--retry);
+
+ mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 0, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+ mutex_unlock(&mddi->reg_read_lock);
+ return ret;
+}
+
+
+void mddi_remote_write(struct msm_mddi_client_data *cdata, uint32_t val,
+ uint32_t reg)
+{
+ struct mddi_info *mddi = container_of(cdata, struct mddi_info,
+ client_data);
+ struct mddi_llentry *ll;
+ struct mddi_register_access *ra;
+
+ mutex_lock(&mddi->reg_write_lock);
+
+ ll = mddi->reg_write_data;
+
+ ra = &(ll->u.r);
+ ra->length = 14 + 4;
+ ra->type = TYPE_REGISTER_ACCESS;
+ ra->client_id = 0;
+ ra->read_write_info = MDDI_WRITE | 1;
+ ra->crc16 = 0;
+
+ ra->register_address = reg;
+ ra->register_data_list = val;
+
+ ll->flags = 1;
+ ll->header_count = 14;
+ ll->data_count = 4;
+ ll->data = mddi->reg_write_addr + offsetof(struct mddi_llentry,
+ u.r.register_data_list);
+ ll->next = 0;
+ ll->reserved = 0;
+
+ mddi_writel(mddi->reg_write_addr, PRI_PTR);
+
+ mddi_wait_interrupt(mddi, MDDI_INT_PRI_LINK_LIST_DONE);
+ mutex_unlock(&mddi->reg_write_lock);
+}
+
+uint32_t mddi_remote_read(struct msm_mddi_client_data *cdata, uint32_t reg)
+{
+ struct mddi_info *mddi = container_of(cdata, struct mddi_info,
+ client_data);
+ struct mddi_llentry *ll;
+ struct mddi_register_access *ra;
+ struct reg_read_info ri;
+ unsigned s;
+ int retry_count = 2;
+ unsigned long irq_flags;
+
+ mutex_lock(&mddi->reg_read_lock);
+
+ ll = mddi->reg_read_data;
+
+ ra = &(ll->u.r);
+ ra->length = 14;
+ ra->type = TYPE_REGISTER_ACCESS;
+ ra->client_id = 0;
+ ra->read_write_info = MDDI_READ | 1;
+ ra->crc16 = 0;
+
+ ra->register_address = reg;
+
+ ll->flags = 0x11;
+ ll->header_count = 14;
+ ll->data_count = 0;
+ ll->data = 0;
+ ll->next = 0;
+ ll->reserved = 0;
+
+ s = mddi_readl(STAT);
+
+ ri.reg = reg;
+ ri.status = -1;
+
+ do {
+ init_completion(&ri.done);
+ mddi->reg_read = &ri;
+ mddi_writel(mddi->reg_read_addr, PRI_PTR);
+
+ mddi_wait_interrupt(mddi, MDDI_INT_PRI_LINK_LIST_DONE);
+
+ /* Enable Periodic Reverse Encapsulation. */
+ mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 1, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+ if (wait_for_completion_timeout(&ri.done, HZ/10) == 0 &&
+ !ri.done.done) {
+ printk(KERN_INFO "mddi_remote_read(%x) timeout "
+ "(%d %d %d)\n",
+ reg, ri.status, ri.result, ri.done.done);
+ spin_lock_irqsave(&mddi->int_lock, irq_flags);
+ mddi->reg_read = NULL;
+ spin_unlock_irqrestore(&mddi->int_lock, irq_flags);
+ ri.status = -1;
+ ri.result = -1;
+ }
+ if (ri.status == 0)
+ break;
+
+ mddi_writel(MDDI_CMD_SEND_RTD, CMD);
+ mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+ printk(KERN_INFO "mddi_remote_read: failed, sent "
+ "MDDI_CMD_SEND_RTD: int %x, stat %x, rtd val %x "
+ "curr_rev_ptr %x\n", mddi_readl(INT), mddi_readl(STAT),
+ mddi_readl(RTD_VAL), mddi_readl(CURR_REV_PTR));
+ } while (retry_count-- > 0);
+ /* Disable Periodic Reverse Encapsulation. */
+ mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 0, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+ mddi->reg_read = NULL;
+ mutex_unlock(&mddi->reg_read_lock);
+ return ri.result;
+}
+
+static struct mddi_info mddi_info[2];
+
+static int mddi_clk_setup(struct platform_device *pdev, struct mddi_info *mddi,
+ unsigned long clk_rate)
+{
+ int ret;
+
+ /* set up the clocks */
+ mddi->clk = clk_get(&pdev->dev, "mddi_clk");
+ if (IS_ERR(mddi->clk)) {
+ printk(KERN_INFO "mddi: failed to get clock\n");
+ return PTR_ERR(mddi->clk);
+ }
+ ret = clk_enable(mddi->clk);
+ if (ret)
+ goto fail;
+ ret = clk_set_rate(mddi->clk, clk_rate);
+ if (ret)
+ goto fail;
+ return 0;
+
+fail:
+ clk_put(mddi->clk);
+ return ret;
+}
+
+static int __init mddi_rev_data_setup(struct mddi_info *mddi)
+{
+ void *dma;
+ dma_addr_t dma_addr;
+
+ /* set up dma buffer */
+ dma = dma_alloc_coherent(NULL, 0x1000, &dma_addr, GFP_KERNEL);
+ if (dma == 0)
+ return -ENOMEM;
+ mddi->rev_data = dma;
+ mddi->rev_data_curr = 0;
+ mddi->rev_addr = dma_addr;
+ mddi->reg_write_data = dma + MDDI_REV_BUFFER_SIZE;
+ mddi->reg_write_addr = dma_addr + MDDI_REV_BUFFER_SIZE;
+ mddi->reg_read_data = mddi->reg_write_data + 1;
+ mddi->reg_read_addr = mddi->reg_write_addr +
+ sizeof(*mddi->reg_write_data);
+ return 0;
+}
+
+static int mddi_probe(struct platform_device *pdev)
+{
+ struct msm_mddi_platform_data *pdata = pdev->dev.platform_data;
+ struct mddi_info *mddi = &mddi_info[pdev->id];
+ struct resource *resource;
+ int ret, i;
+
+ resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!resource) {
+ printk(KERN_ERR "mddi: no associated mem resource!\n");
+ return -ENOMEM;
+ }
+ mddi->base = ioremap(resource->start, resource_size(resource));
+ if (!mddi->base) {
+ printk(KERN_ERR "mddi: failed to remap base!\n");
+ ret = -EINVAL;
+ goto error_ioremap;
+ }
+ resource = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!resource) {
+ printk(KERN_ERR "mddi: no associated irq resource!\n");
+ ret = -EINVAL;
+ goto error_get_irq_resource;
+ }
+ mddi->irq = resource->start;
+ printk(KERN_INFO "mddi: init() base=0x%p irq=%d\n", mddi->base,
+ mddi->irq);
+ mddi->power_client = pdata->power_client;
+
+ mutex_init(&mddi->reg_write_lock);
+ mutex_init(&mddi->reg_read_lock);
+ spin_lock_init(&mddi->int_lock);
+ init_waitqueue_head(&mddi->int_wait);
+
+ ret = mddi_clk_setup(pdev, mddi, pdata->clk_rate);
+ if (ret) {
+ printk(KERN_ERR "mddi: failed to setup clock!\n");
+ goto error_clk_setup;
+ }
+
+ ret = mddi_rev_data_setup(mddi);
+ if (ret) {
+ printk(KERN_ERR "mddi: failed to setup rev data!\n");
+ goto error_rev_data;
+ }
+
+ mddi->int_enable = 0;
+ mddi_writel(mddi->int_enable, INTEN);
+ ret = request_irq(mddi->irq, mddi_isr, 0, "mddi",
+ &mddi->client_data);
+ if (ret) {
+ printk(KERN_ERR "mddi: failed to request enable irq!\n");
+ goto error_request_irq;
+ }
+
+ /* turn on the mddi client bridge chip */
+ if (mddi->power_client)
+ mddi->power_client(&mddi->client_data, 1);
+
+ /* initialize the mddi registers */
+ mddi_set_auto_hibernate(&mddi->client_data, 0);
+ mddi_writel(MDDI_CMD_RESET, CMD);
+ mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
+ mddi->version = mddi_init_registers(mddi);
+ if (mddi->version < 0x20) {
+ printk(KERN_ERR "mddi: unsupported version 0x%x\n",
+ mddi->version);
+ ret = -ENODEV;
+ goto error_mddi_version;
+ }
+
+ /* read the capabilities off the client */
+ if (!mddi_get_client_caps(mddi)) {
+ printk(KERN_INFO "mddi: no client found\n");
+ /* power down the panel */
+ mddi_writel(MDDI_CMD_POWERDOWN, CMD);
+ printk(KERN_INFO "mddi powerdown: stat %x\n", mddi_readl(STAT));
+ msleep(100);
+ printk(KERN_INFO "mddi powerdown: stat %x\n", mddi_readl(STAT));
+ return 0;
+ }
+ mddi_set_auto_hibernate(&mddi->client_data, 1);
+
+ if (mddi->caps.Mfr_Name == 0 && mddi->caps.Product_Code == 0)
+ pdata->fixup(&mddi->caps.Mfr_Name, &mddi->caps.Product_Code);
+
+ mddi->client_pdev.id = 0;
+ for (i = 0; i < pdata->num_clients; i++) {
+ if (pdata->client_platform_data[i].product_id ==
+ (mddi->caps.Mfr_Name << 16 | mddi->caps.Product_Code)) {
+ mddi->client_data.private_client_data =
+ pdata->client_platform_data[i].client_data;
+ mddi->client_pdev.name =
+ pdata->client_platform_data[i].name;
+ mddi->client_pdev.id =
+ pdata->client_platform_data[i].id;
+ /* XXX: possibly set clock */
+ break;
+ }
+ }
+
+ if (i >= pdata->num_clients)
+ mddi->client_pdev.name = "mddi_c_dummy";
+ printk(KERN_INFO "mddi: registering panel %s\n",
+ mddi->client_pdev.name);
+
+ mddi->client_data.suspend = mddi_suspend;
+ mddi->client_data.resume = mddi_resume;
+ mddi->client_data.activate_link = mddi_activate_link;
+ mddi->client_data.remote_write = mddi_remote_write;
+ mddi->client_data.remote_read = mddi_remote_read;
+ mddi->client_data.auto_hibernate = mddi_set_auto_hibernate;
+ mddi->client_data.fb_resource = pdata->fb_resource;
+ if (pdev->id == 0)
+ mddi->client_data.interface_type = MSM_MDDI_PMDH_INTERFACE;
+ else if (pdev->id == 1)
+ mddi->client_data.interface_type = MSM_MDDI_EMDH_INTERFACE;
+ else {
+ printk(KERN_ERR "mddi: can not determine interface %d!\n",
+ pdev->id);
+ ret = -EINVAL;
+ goto error_mddi_interface;
+ }
+
+ mddi->client_pdev.dev.platform_data = &mddi->client_data;
+ printk(KERN_INFO "mddi: publish: %s\n", mddi->client_name);
+ platform_device_register(&mddi->client_pdev);
+ return 0;
+
+error_mddi_interface:
+error_mddi_version:
+ free_irq(mddi->irq, 0);
+error_request_irq:
+ dma_free_coherent(NULL, 0x1000, mddi->rev_data, mddi->rev_addr);
+error_rev_data:
+error_clk_setup:
+error_get_irq_resource:
+ iounmap(mddi->base);
+error_ioremap:
+
+ printk(KERN_INFO "mddi: mddi_init() failed (%d)\n", ret);
+ return ret;
+}
+
+
+static struct platform_driver mddi_driver = {
+ .probe = mddi_probe,
+ .driver = { .name = "msm_mddi" },
+};
+
+static int __init _mddi_init(void)
+{
+ return platform_driver_register(&mddi_driver);
+}
+
+module_init(_mddi_init);
Code Review / kvmfornfv.git / blobdiff