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msm_sdcc.c
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/*
* linux/drivers/mmc/host/msm_sdcc.c - Qualcomm MSM 7X00A SDCC Driver
*
* Copyright (C) 2007 Google Inc,
* Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
* Copyright (C) 2009, Code Aurora Forum. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Based on mmci.c
*
* Author: San Mehat ([email protected])
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/log2.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio.h>
#include <linux/clk.h>
#include <linux/scatterlist.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/debugfs.h>
#include <linux/io.h>
#include <linux/memory.h>
#include <linux/gfp.h>
#include <linux/gpio.h>
#include <asm/cacheflush.h>
#include <asm/div64.h>
#include <asm/sizes.h>
#include <linux/platform_data/mmc-msm_sdcc.h>
#include <mach/dma.h>
#include <mach/clk.h>
#include "msm_sdcc.h"
#define DRIVER_NAME "msm-sdcc"
#define BUSCLK_PWRSAVE 1
#define BUSCLK_TIMEOUT (HZ)
static unsigned int msmsdcc_fmin = 144000;
static unsigned int msmsdcc_fmax = 50000000;
static unsigned int msmsdcc_4bit = 1;
static unsigned int msmsdcc_pwrsave = 1;
static unsigned int msmsdcc_piopoll = 1;
static unsigned int msmsdcc_sdioirq;
#define PIO_SPINMAX 30
#define CMD_SPINMAX 20
static inline void
msmsdcc_disable_clocks(struct msmsdcc_host *host, int deferr)
{
WARN_ON(!host->clks_on);
BUG_ON(host->curr.mrq);
if (deferr) {
mod_timer(&host->busclk_timer, jiffies + BUSCLK_TIMEOUT);
} else {
del_timer_sync(&host->busclk_timer);
/* Need to check clks_on again in case the busclk
* timer fired
*/
if (host->clks_on) {
clk_disable(host->clk);
clk_disable(host->pclk);
host->clks_on = 0;
}
}
}
static inline int
msmsdcc_enable_clocks(struct msmsdcc_host *host)
{
int rc;
del_timer_sync(&host->busclk_timer);
if (!host->clks_on) {
rc = clk_enable(host->pclk);
if (rc)
return rc;
rc = clk_enable(host->clk);
if (rc) {
clk_disable(host->pclk);
return rc;
}
udelay(1 + ((3 * USEC_PER_SEC) /
(host->clk_rate ? host->clk_rate : msmsdcc_fmin)));
host->clks_on = 1;
}
return 0;
}
static inline unsigned int
msmsdcc_readl(struct msmsdcc_host *host, unsigned int reg)
{
return readl(host->base + reg);
}
static inline void
msmsdcc_writel(struct msmsdcc_host *host, u32 data, unsigned int reg)
{
writel(data, host->base + reg);
/* 3 clk delay required! */
udelay(1 + ((3 * USEC_PER_SEC) /
(host->clk_rate ? host->clk_rate : msmsdcc_fmin)));
}
static void
msmsdcc_start_command(struct msmsdcc_host *host, struct mmc_command *cmd,
u32 c);
static void msmsdcc_reset_and_restore(struct msmsdcc_host *host)
{
u32 mci_clk = 0;
u32 mci_mask0 = 0;
int ret = 0;
/* Save the controller state */
mci_clk = readl(host->base + MMCICLOCK);
mci_mask0 = readl(host->base + MMCIMASK0);
/* Reset the controller */
ret = clk_reset(host->clk, CLK_RESET_ASSERT);
if (ret)
pr_err("%s: Clock assert failed at %u Hz with err %d\n",
mmc_hostname(host->mmc), host->clk_rate, ret);
ret = clk_reset(host->clk, CLK_RESET_DEASSERT);
if (ret)
pr_err("%s: Clock deassert failed at %u Hz with err %d\n",
mmc_hostname(host->mmc), host->clk_rate, ret);
pr_info("%s: Controller has been re-initialiazed\n",
mmc_hostname(host->mmc));
/* Restore the contoller state */
writel(host->pwr, host->base + MMCIPOWER);
writel(mci_clk, host->base + MMCICLOCK);
writel(mci_mask0, host->base + MMCIMASK0);
ret = clk_set_rate(host->clk, host->clk_rate);
if (ret)
pr_err("%s: Failed to set clk rate %u Hz (%d)\n",
mmc_hostname(host->mmc), host->clk_rate, ret);
}
static void
msmsdcc_request_end(struct msmsdcc_host *host, struct mmc_request *mrq)
{
BUG_ON(host->curr.data);
host->curr.mrq = NULL;
host->curr.cmd = NULL;
if (mrq->data)
mrq->data->bytes_xfered = host->curr.data_xfered;
if (mrq->cmd->error == -ETIMEDOUT)
mdelay(5);
#if BUSCLK_PWRSAVE
msmsdcc_disable_clocks(host, 1);
#endif
/*
* Need to drop the host lock here; mmc_request_done may call
* back into the driver...
*/
spin_unlock(&host->lock);
mmc_request_done(host->mmc, mrq);
spin_lock(&host->lock);
}
static void
msmsdcc_stop_data(struct msmsdcc_host *host)
{
host->curr.data = NULL;
host->curr.got_dataend = 0;
}
uint32_t msmsdcc_fifo_addr(struct msmsdcc_host *host)
{
return host->memres->start + MMCIFIFO;
}
static inline void
msmsdcc_start_command_exec(struct msmsdcc_host *host, u32 arg, u32 c) {
msmsdcc_writel(host, arg, MMCIARGUMENT);
msmsdcc_writel(host, c, MMCICOMMAND);
}
static void
msmsdcc_dma_exec_func(struct msm_dmov_cmd *cmd)
{
struct msmsdcc_host *host = (struct msmsdcc_host *)cmd->data;
msmsdcc_writel(host, host->cmd_timeout, MMCIDATATIMER);
msmsdcc_writel(host, (unsigned int)host->curr.xfer_size,
MMCIDATALENGTH);
msmsdcc_writel(host, (msmsdcc_readl(host, MMCIMASK0) &
(~MCI_IRQ_PIO)) | host->cmd_pio_irqmask, MMCIMASK0);
msmsdcc_writel(host, host->cmd_datactrl, MMCIDATACTRL);
if (host->cmd_cmd) {
msmsdcc_start_command_exec(host,
(u32) host->cmd_cmd->arg,
(u32) host->cmd_c);
}
host->dma.active = 1;
}
static void
msmsdcc_dma_complete_tlet(unsigned long data)
{
struct msmsdcc_host *host = (struct msmsdcc_host *)data;
unsigned long flags;
struct mmc_request *mrq;
struct msm_dmov_errdata err;
spin_lock_irqsave(&host->lock, flags);
host->dma.active = 0;
err = host->dma.err;
mrq = host->curr.mrq;
BUG_ON(!mrq);
WARN_ON(!mrq->data);
if (!(host->dma.result & DMOV_RSLT_VALID)) {
pr_err("msmsdcc: Invalid DataMover result\n");
goto out;
}
if (host->dma.result & DMOV_RSLT_DONE) {
host->curr.data_xfered = host->curr.xfer_size;
} else {
/* Error or flush */
if (host->dma.result & DMOV_RSLT_ERROR)
pr_err("%s: DMA error (0x%.8x)\n",
mmc_hostname(host->mmc), host->dma.result);
if (host->dma.result & DMOV_RSLT_FLUSH)
pr_err("%s: DMA channel flushed (0x%.8x)\n",
mmc_hostname(host->mmc), host->dma.result);
pr_err("Flush data: %.8x %.8x %.8x %.8x %.8x %.8x\n",
err.flush[0], err.flush[1], err.flush[2],
err.flush[3], err.flush[4], err.flush[5]);
msmsdcc_reset_and_restore(host);
if (!mrq->data->error)
mrq->data->error = -EIO;
}
dma_unmap_sg(mmc_dev(host->mmc), host->dma.sg, host->dma.num_ents,
host->dma.dir);
host->dma.sg = NULL;
host->dma.busy = 0;
if (host->curr.got_dataend || mrq->data->error) {
/*
* If we've already gotten our DATAEND / DATABLKEND
* for this request, then complete it through here.
*/
msmsdcc_stop_data(host);
if (!mrq->data->error)
host->curr.data_xfered = host->curr.xfer_size;
if (!mrq->data->stop || mrq->cmd->error) {
host->curr.mrq = NULL;
host->curr.cmd = NULL;
mrq->data->bytes_xfered = host->curr.data_xfered;
spin_unlock_irqrestore(&host->lock, flags);
#if BUSCLK_PWRSAVE
msmsdcc_disable_clocks(host, 1);
#endif
mmc_request_done(host->mmc, mrq);
return;
} else
msmsdcc_start_command(host, mrq->data->stop, 0);
}
out:
spin_unlock_irqrestore(&host->lock, flags);
return;
}
static void
msmsdcc_dma_complete_func(struct msm_dmov_cmd *cmd,
unsigned int result,
struct msm_dmov_errdata *err)
{
struct msmsdcc_dma_data *dma_data =
container_of(cmd, struct msmsdcc_dma_data, hdr);
struct msmsdcc_host *host = dma_data->host;
dma_data->result = result;
if (err)
memcpy(&dma_data->err, err, sizeof(struct msm_dmov_errdata));
tasklet_schedule(&host->dma_tlet);
}
static int validate_dma(struct msmsdcc_host *host, struct mmc_data *data)
{
if (host->dma.channel == -1)
return -ENOENT;
if ((data->blksz * data->blocks) < MCI_FIFOSIZE)
return -EINVAL;
if ((data->blksz * data->blocks) % MCI_FIFOSIZE)
return -EINVAL;
return 0;
}
static int msmsdcc_config_dma(struct msmsdcc_host *host, struct mmc_data *data)
{
struct msmsdcc_nc_dmadata *nc;
dmov_box *box;
uint32_t rows;
uint32_t crci;
unsigned int n;
int i, rc;
struct scatterlist *sg = data->sg;
rc = validate_dma(host, data);
if (rc)
return rc;
host->dma.sg = data->sg;
host->dma.num_ents = data->sg_len;
BUG_ON(host->dma.num_ents > NR_SG); /* Prevent memory corruption */
nc = host->dma.nc;
switch (host->pdev_id) {
case 1:
crci = MSMSDCC_CRCI_SDC1;
break;
case 2:
crci = MSMSDCC_CRCI_SDC2;
break;
case 3:
crci = MSMSDCC_CRCI_SDC3;
break;
case 4:
crci = MSMSDCC_CRCI_SDC4;
break;
default:
host->dma.sg = NULL;
host->dma.num_ents = 0;
return -ENOENT;
}
if (data->flags & MMC_DATA_READ)
host->dma.dir = DMA_FROM_DEVICE;
else
host->dma.dir = DMA_TO_DEVICE;
host->curr.user_pages = 0;
box = &nc->cmd[0];
/* location of command block must be 64 bit aligned */
BUG_ON(host->dma.cmd_busaddr & 0x07);
nc->cmdptr = (host->dma.cmd_busaddr >> 3) | CMD_PTR_LP;
host->dma.hdr.cmdptr = DMOV_CMD_PTR_LIST |
DMOV_CMD_ADDR(host->dma.cmdptr_busaddr);
host->dma.hdr.complete_func = msmsdcc_dma_complete_func;
n = dma_map_sg(mmc_dev(host->mmc), host->dma.sg,
host->dma.num_ents, host->dma.dir);
if (n == 0) {
pr_err("%s: Unable to map in all sg elements\n",
mmc_hostname(host->mmc));
host->dma.sg = NULL;
host->dma.num_ents = 0;
return -ENOMEM;
}
for_each_sg(host->dma.sg, sg, n, i) {
box->cmd = CMD_MODE_BOX;
if (i == n - 1)
box->cmd |= CMD_LC;
rows = (sg_dma_len(sg) % MCI_FIFOSIZE) ?
(sg_dma_len(sg) / MCI_FIFOSIZE) + 1 :
(sg_dma_len(sg) / MCI_FIFOSIZE) ;
if (data->flags & MMC_DATA_READ) {
box->src_row_addr = msmsdcc_fifo_addr(host);
box->dst_row_addr = sg_dma_address(sg);
box->src_dst_len = (MCI_FIFOSIZE << 16) |
(MCI_FIFOSIZE);
box->row_offset = MCI_FIFOSIZE;
box->num_rows = rows * ((1 << 16) + 1);
box->cmd |= CMD_SRC_CRCI(crci);
} else {
box->src_row_addr = sg_dma_address(sg);
box->dst_row_addr = msmsdcc_fifo_addr(host);
box->src_dst_len = (MCI_FIFOSIZE << 16) |
(MCI_FIFOSIZE);
box->row_offset = (MCI_FIFOSIZE << 16);
box->num_rows = rows * ((1 << 16) + 1);
box->cmd |= CMD_DST_CRCI(crci);
}
box++;
}
return 0;
}
static int
snoop_cccr_abort(struct mmc_command *cmd)
{
if ((cmd->opcode == 52) &&
(cmd->arg & 0x80000000) &&
(((cmd->arg >> 9) & 0x1ffff) == SDIO_CCCR_ABORT))
return 1;
return 0;
}
static void
msmsdcc_start_command_deferred(struct msmsdcc_host *host,
struct mmc_command *cmd, u32 *c)
{
*c |= (cmd->opcode | MCI_CPSM_ENABLE);
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136)
*c |= MCI_CPSM_LONGRSP;
*c |= MCI_CPSM_RESPONSE;
}
if (/*interrupt*/0)
*c |= MCI_CPSM_INTERRUPT;
if ((((cmd->opcode == 17) || (cmd->opcode == 18)) ||
((cmd->opcode == 24) || (cmd->opcode == 25))) ||
(cmd->opcode == 53))
*c |= MCI_CSPM_DATCMD;
if (host->prog_scan && (cmd->opcode == 12)) {
*c |= MCI_CPSM_PROGENA;
host->prog_enable = true;
}
if (cmd == cmd->mrq->stop)
*c |= MCI_CSPM_MCIABORT;
if (snoop_cccr_abort(cmd))
*c |= MCI_CSPM_MCIABORT;
if (host->curr.cmd != NULL) {
pr_err("%s: Overlapping command requests\n",
mmc_hostname(host->mmc));
}
host->curr.cmd = cmd;
}
static void
msmsdcc_start_data(struct msmsdcc_host *host, struct mmc_data *data,
struct mmc_command *cmd, u32 c)
{
unsigned int datactrl, timeout;
unsigned long long clks;
unsigned int pio_irqmask = 0;
host->curr.data = data;
host->curr.xfer_size = data->blksz * data->blocks;
host->curr.xfer_remain = host->curr.xfer_size;
host->curr.data_xfered = 0;
host->curr.got_dataend = 0;
memset(&host->pio, 0, sizeof(host->pio));
datactrl = MCI_DPSM_ENABLE | (data->blksz << 4);
if (!msmsdcc_config_dma(host, data))
datactrl |= MCI_DPSM_DMAENABLE;
else {
host->pio.sg = data->sg;
host->pio.sg_len = data->sg_len;
host->pio.sg_off = 0;
if (data->flags & MMC_DATA_READ) {
pio_irqmask = MCI_RXFIFOHALFFULLMASK;
if (host->curr.xfer_remain < MCI_FIFOSIZE)
pio_irqmask |= MCI_RXDATAAVLBLMASK;
} else
pio_irqmask = MCI_TXFIFOHALFEMPTYMASK;
}
if (data->flags & MMC_DATA_READ)
datactrl |= MCI_DPSM_DIRECTION;
clks = (unsigned long long)data->timeout_ns * host->clk_rate;
do_div(clks, NSEC_PER_SEC);
timeout = data->timeout_clks + (unsigned int)clks*2 ;
if (datactrl & MCI_DPSM_DMAENABLE) {
/* Save parameters for the exec function */
host->cmd_timeout = timeout;
host->cmd_pio_irqmask = pio_irqmask;
host->cmd_datactrl = datactrl;
host->cmd_cmd = cmd;
host->dma.hdr.execute_func = msmsdcc_dma_exec_func;
host->dma.hdr.data = (void *)host;
host->dma.busy = 1;
if (cmd) {
msmsdcc_start_command_deferred(host, cmd, &c);
host->cmd_c = c;
}
msm_dmov_enqueue_cmd(host->dma.channel, &host->dma.hdr);
if (data->flags & MMC_DATA_WRITE)
host->prog_scan = true;
} else {
msmsdcc_writel(host, timeout, MMCIDATATIMER);
msmsdcc_writel(host, host->curr.xfer_size, MMCIDATALENGTH);
msmsdcc_writel(host, (msmsdcc_readl(host, MMCIMASK0) &
(~MCI_IRQ_PIO)) | pio_irqmask, MMCIMASK0);
msmsdcc_writel(host, datactrl, MMCIDATACTRL);
if (cmd) {
/* Daisy-chain the command if requested */
msmsdcc_start_command(host, cmd, c);
}
}
}
static void
msmsdcc_start_command(struct msmsdcc_host *host, struct mmc_command *cmd, u32 c)
{
if (cmd == cmd->mrq->stop)
c |= MCI_CSPM_MCIABORT;
host->stats.cmds++;
msmsdcc_start_command_deferred(host, cmd, &c);
msmsdcc_start_command_exec(host, cmd->arg, c);
}
static void
msmsdcc_data_err(struct msmsdcc_host *host, struct mmc_data *data,
unsigned int status)
{
if (status & MCI_DATACRCFAIL) {
pr_err("%s: Data CRC error\n", mmc_hostname(host->mmc));
pr_err("%s: opcode 0x%.8x\n", __func__,
data->mrq->cmd->opcode);
pr_err("%s: blksz %d, blocks %d\n", __func__,
data->blksz, data->blocks);
data->error = -EILSEQ;
} else if (status & MCI_DATATIMEOUT) {
pr_err("%s: Data timeout\n", mmc_hostname(host->mmc));
data->error = -ETIMEDOUT;
} else if (status & MCI_RXOVERRUN) {
pr_err("%s: RX overrun\n", mmc_hostname(host->mmc));
data->error = -EIO;
} else if (status & MCI_TXUNDERRUN) {
pr_err("%s: TX underrun\n", mmc_hostname(host->mmc));
data->error = -EIO;
} else {
pr_err("%s: Unknown error (0x%.8x)\n",
mmc_hostname(host->mmc), status);
data->error = -EIO;
}
}
static int
msmsdcc_pio_read(struct msmsdcc_host *host, char *buffer, unsigned int remain)
{
uint32_t *ptr = (uint32_t *) buffer;
int count = 0;
if (remain % 4)
remain = ((remain >> 2) + 1) << 2;
while (msmsdcc_readl(host, MMCISTATUS) & MCI_RXDATAAVLBL) {
*ptr = msmsdcc_readl(host, MMCIFIFO + (count % MCI_FIFOSIZE));
ptr++;
count += sizeof(uint32_t);
remain -= sizeof(uint32_t);
if (remain == 0)
break;
}
return count;
}
static int
msmsdcc_pio_write(struct msmsdcc_host *host, char *buffer,
unsigned int remain, u32 status)
{
void __iomem *base = host->base;
char *ptr = buffer;
do {
unsigned int count, maxcnt, sz;
maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE :
MCI_FIFOHALFSIZE;
count = min(remain, maxcnt);
sz = count % 4 ? (count >> 2) + 1 : (count >> 2);
writesl(base + MMCIFIFO, ptr, sz);
ptr += count;
remain -= count;
if (remain == 0)
break;
status = msmsdcc_readl(host, MMCISTATUS);
} while (status & MCI_TXFIFOHALFEMPTY);
return ptr - buffer;
}
static int
msmsdcc_spin_on_status(struct msmsdcc_host *host, uint32_t mask, int maxspin)
{
while (maxspin) {
if ((msmsdcc_readl(host, MMCISTATUS) & mask))
return 0;
udelay(1);
--maxspin;
}
return -ETIMEDOUT;
}
static irqreturn_t
msmsdcc_pio_irq(int irq, void *dev_id)
{
struct msmsdcc_host *host = dev_id;
uint32_t status;
u32 mci_mask0;
status = msmsdcc_readl(host, MMCISTATUS);
mci_mask0 = msmsdcc_readl(host, MMCIMASK0);
if (((mci_mask0 & status) & MCI_IRQ_PIO) == 0)
return IRQ_NONE;
do {
unsigned long flags;
unsigned int remain, len;
char *buffer;
if (!(status & (MCI_TXFIFOHALFEMPTY | MCI_RXDATAAVLBL))) {
if (host->curr.xfer_remain == 0 || !msmsdcc_piopoll)
break;
if (msmsdcc_spin_on_status(host,
(MCI_TXFIFOHALFEMPTY |
MCI_RXDATAAVLBL),
PIO_SPINMAX)) {
break;
}
}
/* Map the current scatter buffer */
local_irq_save(flags);
buffer = kmap_atomic(sg_page(host->pio.sg))
+ host->pio.sg->offset;
buffer += host->pio.sg_off;
remain = host->pio.sg->length - host->pio.sg_off;
len = 0;
if (status & MCI_RXACTIVE)
len = msmsdcc_pio_read(host, buffer, remain);
if (status & MCI_TXACTIVE)
len = msmsdcc_pio_write(host, buffer, remain, status);
/* Unmap the buffer */
kunmap_atomic(buffer);
local_irq_restore(flags);
host->pio.sg_off += len;
host->curr.xfer_remain -= len;
host->curr.data_xfered += len;
remain -= len;
if (remain == 0) {
/* This sg page is full - do some housekeeping */
if (status & MCI_RXACTIVE && host->curr.user_pages)
flush_dcache_page(sg_page(host->pio.sg));
if (!--host->pio.sg_len) {
memset(&host->pio, 0, sizeof(host->pio));
break;
}
/* Advance to next sg */
host->pio.sg++;
host->pio.sg_off = 0;
}
status = msmsdcc_readl(host, MMCISTATUS);
} while (1);
if (status & MCI_RXACTIVE && host->curr.xfer_remain < MCI_FIFOSIZE)
msmsdcc_writel(host, (mci_mask0 & (~MCI_IRQ_PIO)) |
MCI_RXDATAAVLBLMASK, MMCIMASK0);
if (!host->curr.xfer_remain)
msmsdcc_writel(host, (mci_mask0 & (~MCI_IRQ_PIO)) | 0,
MMCIMASK0);
return IRQ_HANDLED;
}
static void msmsdcc_do_cmdirq(struct msmsdcc_host *host, uint32_t status)
{
struct mmc_command *cmd = host->curr.cmd;
host->curr.cmd = NULL;
cmd->resp[0] = msmsdcc_readl(host, MMCIRESPONSE0);
cmd->resp[1] = msmsdcc_readl(host, MMCIRESPONSE1);
cmd->resp[2] = msmsdcc_readl(host, MMCIRESPONSE2);
cmd->resp[3] = msmsdcc_readl(host, MMCIRESPONSE3);
if (status & MCI_CMDTIMEOUT) {
cmd->error = -ETIMEDOUT;
} else if (status & MCI_CMDCRCFAIL &&
cmd->flags & MMC_RSP_CRC) {
pr_err("%s: Command CRC error\n", mmc_hostname(host->mmc));
cmd->error = -EILSEQ;
}
if (!cmd->data || cmd->error) {
if (host->curr.data && host->dma.sg)
msm_dmov_stop_cmd(host->dma.channel,
&host->dma.hdr, 0);
else if (host->curr.data) { /* Non DMA */
msmsdcc_reset_and_restore(host);
msmsdcc_stop_data(host);
msmsdcc_request_end(host, cmd->mrq);
} else { /* host->data == NULL */
if (!cmd->error && host->prog_enable) {
if (status & MCI_PROGDONE) {
host->prog_scan = false;
host->prog_enable = false;
msmsdcc_request_end(host, cmd->mrq);
} else {
host->curr.cmd = cmd;
}
} else {
if (host->prog_enable) {
host->prog_scan = false;
host->prog_enable = false;
}
msmsdcc_request_end(host, cmd->mrq);
}
}
} else if (cmd->data)
if (!(cmd->data->flags & MMC_DATA_READ))
msmsdcc_start_data(host, cmd->data,
NULL, 0);
}
static void
msmsdcc_handle_irq_data(struct msmsdcc_host *host, u32 status,
void __iomem *base)
{
struct mmc_data *data = host->curr.data;
if (status & (MCI_CMDSENT | MCI_CMDRESPEND | MCI_CMDCRCFAIL |
MCI_CMDTIMEOUT | MCI_PROGDONE) && host->curr.cmd) {
msmsdcc_do_cmdirq(host, status);
}
if (!data)
return;
/* Check for data errors */
if (status & (MCI_DATACRCFAIL | MCI_DATATIMEOUT |
MCI_TXUNDERRUN | MCI_RXOVERRUN)) {
msmsdcc_data_err(host, data, status);
host->curr.data_xfered = 0;
if (host->dma.sg)
msm_dmov_stop_cmd(host->dma.channel,
&host->dma.hdr, 0);
else {
msmsdcc_reset_and_restore(host);
if (host->curr.data)
msmsdcc_stop_data(host);
if (!data->stop)
msmsdcc_request_end(host, data->mrq);
else
msmsdcc_start_command(host, data->stop, 0);
}
}
/* Check for data done */
if (!host->curr.got_dataend && (status & MCI_DATAEND))
host->curr.got_dataend = 1;
/*
* If DMA is still in progress, we complete via the completion handler
*/
if (host->curr.got_dataend && !host->dma.busy) {
/*
* There appears to be an issue in the controller where
* if you request a small block transfer (< fifo size),
* you may get your DATAEND/DATABLKEND irq without the
* PIO data irq.
*
* Check to see if there is still data to be read,
* and simulate a PIO irq.
*/
if (readl(base + MMCISTATUS) & MCI_RXDATAAVLBL)
msmsdcc_pio_irq(1, host);
msmsdcc_stop_data(host);
if (!data->error)
host->curr.data_xfered = host->curr.xfer_size;
if (!data->stop)
msmsdcc_request_end(host, data->mrq);
else
msmsdcc_start_command(host, data->stop, 0);
}
}
static irqreturn_t
msmsdcc_irq(int irq, void *dev_id)
{
struct msmsdcc_host *host = dev_id;
void __iomem *base = host->base;
u32 status;
int ret = 0;
int cardint = 0;
spin_lock(&host->lock);
do {
status = msmsdcc_readl(host, MMCISTATUS);
status &= msmsdcc_readl(host, MMCIMASK0);
if ((status & (~MCI_IRQ_PIO)) == 0)
break;
msmsdcc_writel(host, status, MMCICLEAR);
if (status & MCI_SDIOINTR)
status &= ~MCI_SDIOINTR;
if (!status)
break;
msmsdcc_handle_irq_data(host, status, base);
if (status & MCI_SDIOINTOPER) {
cardint = 1;
status &= ~MCI_SDIOINTOPER;
}
ret = 1;
} while (status);
spin_unlock(&host->lock);
/*
* We have to delay handling the card interrupt as it calls
* back into the driver.
*/
if (cardint)
mmc_signal_sdio_irq(host->mmc);
return IRQ_RETVAL(ret);
}
static void
msmsdcc_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct msmsdcc_host *host = mmc_priv(mmc);
unsigned long flags;
WARN_ON(host->curr.mrq != NULL);
WARN_ON(host->pwr == 0);
spin_lock_irqsave(&host->lock, flags);
host->stats.reqs++;
if (host->eject) {
if (mrq->data && !(mrq->data->flags & MMC_DATA_READ)) {
mrq->cmd->error = 0;
mrq->data->bytes_xfered = mrq->data->blksz *
mrq->data->blocks;
} else
mrq->cmd->error = -ENOMEDIUM;
spin_unlock_irqrestore(&host->lock, flags);
mmc_request_done(mmc, mrq);
return;
}
msmsdcc_enable_clocks(host);
host->curr.mrq = mrq;
if (mrq->data && mrq->data->flags & MMC_DATA_READ)
/* Queue/read data, daisy-chain command when data starts */
msmsdcc_start_data(host, mrq->data, mrq->cmd, 0);
else
msmsdcc_start_command(host, mrq->cmd, 0);
if (host->cmdpoll && !msmsdcc_spin_on_status(host,
MCI_CMDRESPEND|MCI_CMDCRCFAIL|MCI_CMDTIMEOUT,
CMD_SPINMAX)) {
uint32_t status = msmsdcc_readl(host, MMCISTATUS);
msmsdcc_do_cmdirq(host, status);
msmsdcc_writel(host,
MCI_CMDRESPEND | MCI_CMDCRCFAIL | MCI_CMDTIMEOUT,
MMCICLEAR);
host->stats.cmdpoll_hits++;
} else {
host->stats.cmdpoll_misses++;
}
spin_unlock_irqrestore(&host->lock, flags);
}
static void msmsdcc_setup_gpio(struct msmsdcc_host *host, bool enable)
{
struct msm_mmc_gpio_data *curr;
int i, rc = 0;
if (!host->plat->gpio_data || host->gpio_config_status == enable)
return;
curr = host->plat->gpio_data;
for (i = 0; i < curr->size; i++) {
if (enable) {
rc = gpio_request(curr->gpio[i].no,
curr->gpio[i].name);
if (rc) {
pr_err("%s: gpio_request(%d, %s) failed %d\n",
mmc_hostname(host->mmc),
curr->gpio[i].no,
curr->gpio[i].name, rc);
goto free_gpios;
}
} else {
gpio_free(curr->gpio[i].no);
}
}
host->gpio_config_status = enable;
return;
free_gpios:
for (; i >= 0; i--)
gpio_free(curr->gpio[i].no);
}
static void
msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct msmsdcc_host *host = mmc_priv(mmc);
u32 clk = 0, pwr = 0;
int rc;
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
msmsdcc_enable_clocks(host);
spin_unlock_irqrestore(&host->lock, flags);
if (ios->clock) {
if (ios->clock != host->clk_rate) {
rc = clk_set_rate(host->clk, ios->clock);
if (rc < 0)
pr_err("%s: Error setting clock rate (%d)\n",
mmc_hostname(host->mmc), rc);
else