linux/drivers/mmc/host/msm_sdcc.c
Joe Perches b5a74d6058 msm_sdcc.c: move overly indented code to separate function
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Brian Swetland <swetland@google.com>
Cc: Pierre Ossman <drzeus-list@drzeus.cx>
Cc: San Mehat <san@android.com>
Cc: Matt Fleming <matt@console-pimps.org>
Cc: Ian Molton <ian@mnementh.co.uk>
Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com>
Cc: Philip Langdale <philipl@overt.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-23 07:39:33 -07:00

1288 lines
30 KiB
C

/*
* 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.
*
* 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 (san@android.com)
*
*/
#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/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 <asm/cacheflush.h>
#include <asm/div64.h>
#include <asm/sizes.h>
#include <asm/mach/mmc.h>
#include <mach/msm_iomap.h>
#include <mach/dma.h>
#include <mach/htc_pwrsink.h>
#include "msm_sdcc.h"
#define DRIVER_NAME "msm-sdcc"
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 void
msmsdcc_start_command(struct msmsdcc_host *host, struct mmc_command *cmd,
u32 c);
static void
msmsdcc_request_end(struct msmsdcc_host *host, struct mmc_request *mrq)
{
writel(0, host->base + MMCICOMMAND);
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);
/*
* 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)
{
writel(0, host->base + MMCIDATACTRL);
host->curr.data = NULL;
host->curr.got_dataend = host->curr.got_datablkend = 0;
}
uint32_t msmsdcc_fifo_addr(struct msmsdcc_host *host)
{
switch (host->pdev_id) {
case 1:
return MSM_SDC1_PHYS + MMCIFIFO;
case 2:
return MSM_SDC2_PHYS + MMCIFIFO;
case 3:
return MSM_SDC3_PHYS + MMCIFIFO;
case 4:
return MSM_SDC4_PHYS + MMCIFIFO;
}
BUG();
return 0;
}
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;
unsigned long flags;
struct mmc_request *mrq;
spin_lock_irqsave(&host->lock, flags);
mrq = host->curr.mrq;
BUG_ON(!mrq);
if (!(result & DMOV_RSLT_VALID)) {
pr_err("msmsdcc: Invalid DataMover result\n");
goto out;
}
if (result & DMOV_RSLT_DONE) {
host->curr.data_xfered = host->curr.xfer_size;
} else {
/* Error or flush */
if (result & DMOV_RSLT_ERROR)
pr_err("%s: DMA error (0x%.8x)\n",
mmc_hostname(host->mmc), result);
if (result & DMOV_RSLT_FLUSH)
pr_err("%s: DMA channel flushed (0x%.8x)\n",
mmc_hostname(host->mmc), result);
if (err)
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]);
if (!mrq->data->error)
mrq->data->error = -EIO;
}
host->dma.busy = 0;
dma_unmap_sg(mmc_dev(host->mmc), host->dma.sg, host->dma.num_ents,
host->dma.dir);
if (host->curr.user_pages) {
struct scatterlist *sg = host->dma.sg;
int i;
for (i = 0; i < host->dma.num_ents; i++)
flush_dcache_page(sg_page(sg++));
}
host->dma.sg = NULL;
if ((host->curr.got_dataend && host->curr.got_datablkend)
|| 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) {
writel(0, host->base + MMCICOMMAND);
host->curr.mrq = NULL;
host->curr.cmd = NULL;
mrq->data->bytes_xfered = host->curr.data_xfered;
spin_unlock_irqrestore(&host->lock, flags);
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 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;
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;
n = dma_map_sg(mmc_dev(host->mmc), host->dma.sg,
host->dma.num_ents, host->dma.dir);
if (n != host->dma.num_ents) {
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;
}
box = &nc->cmd[0];
for (i = 0; i < host->dma.num_ents; i++) {
box->cmd = CMD_MODE_BOX;
if (i == (host->dma.num_ents - 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++;
sg++;
}
/* 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;
return 0;
}
static void
msmsdcc_start_data(struct msmsdcc_host *host, struct mmc_data *data)
{
unsigned int datactrl, timeout;
unsigned long long clks;
void __iomem *base = host->base;
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;
host->curr.got_datablkend = 0;
memset(&host->pio, 0, sizeof(host->pio));
clks = (unsigned long long)data->timeout_ns * host->clk_rate;
do_div(clks, NSEC_PER_SEC);
timeout = data->timeout_clks + (unsigned int)clks;
writel(timeout, base + MMCIDATATIMER);
writel(host->curr.xfer_size, base + MMCIDATALENGTH);
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;
writel(pio_irqmask, base + MMCIMASK1);
writel(datactrl, base + MMCIDATACTRL);
if (datactrl & MCI_DPSM_DMAENABLE) {
host->dma.busy = 1;
msm_dmov_enqueue_cmd(host->dma.channel, &host->dma.hdr);
}
}
static void
msmsdcc_start_command(struct msmsdcc_host *host, struct mmc_command *cmd, u32 c)
{
void __iomem *base = host->base;
if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
writel(0, base + MMCICOMMAND);
udelay(2 + ((5 * 1000000) / host->clk_rate));
}
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 (cmd->opcode == 17 || cmd->opcode == 18 ||
cmd->opcode == 24 || cmd->opcode == 25 ||
cmd->opcode == 53)
c |= MCI_CSPM_DATCMD;
if (cmd == cmd->mrq->stop)
c |= MCI_CSPM_MCIABORT;
host->curr.cmd = cmd;
host->stats.cmds++;
writel(cmd->arg, base + MMCIARGUMENT);
writel(c, base + MMCICOMMAND);
}
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)
{
void __iomem *base = host->base;
uint32_t *ptr = (uint32_t *) buffer;
int count = 0;
while (readl(base + MMCISTATUS) & MCI_RXDATAAVLBL) {
*ptr = readl(base + 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;
maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE :
MCI_FIFOHALFSIZE;
count = min(remain, maxcnt);
writesl(base + MMCIFIFO, ptr, count >> 2);
ptr += count;
remain -= count;
if (remain == 0)
break;
status = readl(base + 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 ((readl(host->base + MMCISTATUS) & mask))
return 0;
udelay(1);
--maxspin;
}
return -ETIMEDOUT;
}
static int
msmsdcc_pio_irq(int irq, void *dev_id)
{
struct msmsdcc_host *host = dev_id;
void __iomem *base = host->base;
uint32_t status;
status = readl(base + MMCISTATUS);
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),
KM_BIO_SRC_IRQ) + 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, KM_BIO_SRC_IRQ);
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 = readl(base + MMCISTATUS);
} while (1);
if (status & MCI_RXACTIVE && host->curr.xfer_remain < MCI_FIFOSIZE)
writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
if (!host->curr.xfer_remain)
writel(0, base + MMCIMASK1);
return IRQ_HANDLED;
}
static void msmsdcc_do_cmdirq(struct msmsdcc_host *host, uint32_t status)
{
struct mmc_command *cmd = host->curr.cmd;
void __iomem *base = host->base;
host->curr.cmd = NULL;
cmd->resp[0] = readl(base + MMCIRESPONSE0);
cmd->resp[1] = readl(base + MMCIRESPONSE1);
cmd->resp[2] = readl(base + MMCIRESPONSE2);
cmd->resp[3] = readl(base + MMCIRESPONSE3);
del_timer(&host->command_timer);
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_stop_data(host);
msmsdcc_request_end(host, cmd->mrq);
} else /* host->data == NULL */
msmsdcc_request_end(host, cmd->mrq);
} else if (!(cmd->data->flags & MMC_DATA_READ))
msmsdcc_start_data(host, cmd->data);
}
static void
msmsdcc_handle_irq_data(struct msmsdcc_host *host, u32 status,
void __iomem *base)
{
struct mmc_data *data = host->curr.data;
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_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 (!host->curr.got_datablkend && (status & MCI_DATABLOCKEND))
host->curr.got_datablkend = 1;
/*
* If DMA is still in progress, we complete via the completion handler
*/
if (host->curr.got_dataend && host->curr.got_datablkend &&
!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 = readl(base + MMCISTATUS);
status &= (readl(base + MMCIMASK0) | MCI_DATABLOCKENDMASK);
writel(status, base + MMCICLEAR);
msmsdcc_handle_irq_data(host, status, base);
if (status & (MCI_CMDSENT | MCI_CMDRESPEND | MCI_CMDCRCFAIL |
MCI_CMDTIMEOUT) && host->curr.cmd) {
msmsdcc_do_cmdirq(host, status);
}
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;
}
host->curr.mrq = mrq;
if (mrq->data && mrq->data->flags & MMC_DATA_READ)
msmsdcc_start_data(host, mrq->data);
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 = readl(host->base + MMCISTATUS);
msmsdcc_do_cmdirq(host, status);
writel(MCI_CMDRESPEND | MCI_CMDCRCFAIL | MCI_CMDTIMEOUT,
host->base + MMCICLEAR);
host->stats.cmdpoll_hits++;
} else {
host->stats.cmdpoll_misses++;
mod_timer(&host->command_timer, jiffies + HZ);
}
spin_unlock_irqrestore(&host->lock, flags);
}
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;
if (ios->clock) {
if (!host->clks_on) {
clk_enable(host->pclk);
clk_enable(host->clk);
host->clks_on = 1;
}
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
host->clk_rate = ios->clock;
}
clk |= MCI_CLK_ENABLE;
}
if (ios->bus_width == MMC_BUS_WIDTH_4)
clk |= (2 << 10); /* Set WIDEBUS */
if (ios->clock > 400000 && msmsdcc_pwrsave)
clk |= (1 << 9); /* PWRSAVE */
clk |= (1 << 12); /* FLOW_ENA */
clk |= (1 << 15); /* feedback clock */
if (host->plat->translate_vdd)
pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
switch (ios->power_mode) {
case MMC_POWER_OFF:
htc_pwrsink_set(PWRSINK_SDCARD, 0);
break;
case MMC_POWER_UP:
pwr |= MCI_PWR_UP;
break;
case MMC_POWER_ON:
htc_pwrsink_set(PWRSINK_SDCARD, 100);
pwr |= MCI_PWR_ON;
break;
}
if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
pwr |= MCI_OD;
writel(clk, host->base + MMCICLOCK);
if (host->pwr != pwr) {
host->pwr = pwr;
writel(pwr, host->base + MMCIPOWER);
}
if (!(clk & MCI_CLK_ENABLE) && host->clks_on) {
clk_disable(host->clk);
clk_disable(host->pclk);
host->clks_on = 0;
}
}
static void msmsdcc_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
struct msmsdcc_host *host = mmc_priv(mmc);
unsigned long flags;
u32 status;
spin_lock_irqsave(&host->lock, flags);
if (msmsdcc_sdioirq == 1) {
status = readl(host->base + MMCIMASK0);
if (enable)
status |= MCI_SDIOINTOPERMASK;
else
status &= ~MCI_SDIOINTOPERMASK;
host->saved_irq0mask = status;
writel(status, host->base + MMCIMASK0);
}
spin_unlock_irqrestore(&host->lock, flags);
}
static const struct mmc_host_ops msmsdcc_ops = {
.request = msmsdcc_request,
.set_ios = msmsdcc_set_ios,
.enable_sdio_irq = msmsdcc_enable_sdio_irq,
};
static void
msmsdcc_check_status(unsigned long data)
{
struct msmsdcc_host *host = (struct msmsdcc_host *)data;
unsigned int status;
if (!host->plat->status) {
mmc_detect_change(host->mmc, 0);
goto out;
}
status = host->plat->status(mmc_dev(host->mmc));
host->eject = !status;
if (status ^ host->oldstat) {
pr_info("%s: Slot status change detected (%d -> %d)\n",
mmc_hostname(host->mmc), host->oldstat, status);
if (status)
mmc_detect_change(host->mmc, (5 * HZ) / 2);
else
mmc_detect_change(host->mmc, 0);
}
host->oldstat = status;
out:
if (host->timer.function)
mod_timer(&host->timer, jiffies + HZ);
}
static irqreturn_t
msmsdcc_platform_status_irq(int irq, void *dev_id)
{
struct msmsdcc_host *host = dev_id;
printk(KERN_DEBUG "%s: %d\n", __func__, irq);
msmsdcc_check_status((unsigned long) host);
return IRQ_HANDLED;
}
static void
msmsdcc_status_notify_cb(int card_present, void *dev_id)
{
struct msmsdcc_host *host = dev_id;
printk(KERN_DEBUG "%s: card_present %d\n", mmc_hostname(host->mmc),
card_present);
msmsdcc_check_status((unsigned long) host);
}
/*
* called when a command expires.
* Dump some debugging, and then error
* out the transaction.
*/
static void
msmsdcc_command_expired(unsigned long _data)
{
struct msmsdcc_host *host = (struct msmsdcc_host *) _data;
struct mmc_request *mrq;
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
mrq = host->curr.mrq;
if (!mrq) {
pr_info("%s: Command expiry misfire\n",
mmc_hostname(host->mmc));
spin_unlock_irqrestore(&host->lock, flags);
return;
}
pr_err("%s: Command timeout (%p %p %p %p)\n",
mmc_hostname(host->mmc), mrq, mrq->cmd,
mrq->data, host->dma.sg);
mrq->cmd->error = -ETIMEDOUT;
msmsdcc_stop_data(host);
writel(0, host->base + MMCICOMMAND);
host->curr.mrq = NULL;
host->curr.cmd = NULL;
spin_unlock_irqrestore(&host->lock, flags);
mmc_request_done(host->mmc, mrq);
}
static int
msmsdcc_init_dma(struct msmsdcc_host *host)
{
memset(&host->dma, 0, sizeof(struct msmsdcc_dma_data));
host->dma.host = host;
host->dma.channel = -1;
if (!host->dmares)
return -ENODEV;
host->dma.nc = dma_alloc_coherent(NULL,
sizeof(struct msmsdcc_nc_dmadata),
&host->dma.nc_busaddr,
GFP_KERNEL);
if (host->dma.nc == NULL) {
pr_err("Unable to allocate DMA buffer\n");
return -ENOMEM;
}
memset(host->dma.nc, 0x00, sizeof(struct msmsdcc_nc_dmadata));
host->dma.cmd_busaddr = host->dma.nc_busaddr;
host->dma.cmdptr_busaddr = host->dma.nc_busaddr +
offsetof(struct msmsdcc_nc_dmadata, cmdptr);
host->dma.channel = host->dmares->start;
return 0;
}
#ifdef CONFIG_MMC_MSM7X00A_RESUME_IN_WQ
static void
do_resume_work(struct work_struct *work)
{
struct msmsdcc_host *host =
container_of(work, struct msmsdcc_host, resume_task);
struct mmc_host *mmc = host->mmc;
if (mmc) {
mmc_resume_host(mmc);
if (host->stat_irq)
enable_irq(host->stat_irq);
}
}
#endif
static int
msmsdcc_probe(struct platform_device *pdev)
{
struct mmc_platform_data *plat = pdev->dev.platform_data;
struct msmsdcc_host *host;
struct mmc_host *mmc;
struct resource *cmd_irqres = NULL;
struct resource *pio_irqres = NULL;
struct resource *stat_irqres = NULL;
struct resource *memres = NULL;
struct resource *dmares = NULL;
int ret;
/* must have platform data */
if (!plat) {
pr_err("%s: Platform data not available\n", __func__);
ret = -EINVAL;
goto out;
}
if (pdev->id < 1 || pdev->id > 4)
return -EINVAL;
if (pdev->resource == NULL || pdev->num_resources < 2) {
pr_err("%s: Invalid resource\n", __func__);
return -ENXIO;
}
memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
cmd_irqres = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
"cmd_irq");
pio_irqres = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
"pio_irq");
stat_irqres = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
"status_irq");
if (!cmd_irqres || !pio_irqres || !memres) {
pr_err("%s: Invalid resource\n", __func__);
return -ENXIO;
}
/*
* Setup our host structure
*/
mmc = mmc_alloc_host(sizeof(struct msmsdcc_host), &pdev->dev);
if (!mmc) {
ret = -ENOMEM;
goto out;
}
host = mmc_priv(mmc);
host->pdev_id = pdev->id;
host->plat = plat;
host->mmc = mmc;
host->cmdpoll = 1;
host->base = ioremap(memres->start, PAGE_SIZE);
if (!host->base) {
ret = -ENOMEM;
goto out;
}
host->cmd_irqres = cmd_irqres;
host->pio_irqres = pio_irqres;
host->memres = memres;
host->dmares = dmares;
spin_lock_init(&host->lock);
/*
* Setup DMA
*/
msmsdcc_init_dma(host);
/*
* Setup main peripheral bus clock
*/
host->pclk = clk_get(&pdev->dev, "sdc_pclk");
if (IS_ERR(host->pclk)) {
ret = PTR_ERR(host->pclk);
goto host_free;
}
ret = clk_enable(host->pclk);
if (ret)
goto pclk_put;
host->pclk_rate = clk_get_rate(host->pclk);
/*
* Setup SDC MMC clock
*/
host->clk = clk_get(&pdev->dev, "sdc_clk");
if (IS_ERR(host->clk)) {
ret = PTR_ERR(host->clk);
goto pclk_disable;
}
ret = clk_enable(host->clk);
if (ret)
goto clk_put;
ret = clk_set_rate(host->clk, msmsdcc_fmin);
if (ret) {
pr_err("%s: Clock rate set failed (%d)\n", __func__, ret);
goto clk_disable;
}
host->clk_rate = clk_get_rate(host->clk);
host->clks_on = 1;
/*
* Setup MMC host structure
*/
mmc->ops = &msmsdcc_ops;
mmc->f_min = msmsdcc_fmin;
mmc->f_max = msmsdcc_fmax;
mmc->ocr_avail = plat->ocr_mask;
if (msmsdcc_4bit)
mmc->caps |= MMC_CAP_4_BIT_DATA;
if (msmsdcc_sdioirq)
mmc->caps |= MMC_CAP_SDIO_IRQ;
mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED;
mmc->max_phys_segs = NR_SG;
mmc->max_hw_segs = NR_SG;
mmc->max_blk_size = 4096; /* MCI_DATA_CTL BLOCKSIZE up to 4096 */
mmc->max_blk_count = 65536;
mmc->max_req_size = 33554432; /* MCI_DATA_LENGTH is 25 bits */
mmc->max_seg_size = mmc->max_req_size;
writel(0, host->base + MMCIMASK0);
writel(0x5e007ff, host->base + MMCICLEAR); /* Add: 1 << 25 */
writel(MCI_IRQENABLE, host->base + MMCIMASK0);
host->saved_irq0mask = MCI_IRQENABLE;
/*
* Setup card detect change
*/
memset(&host->timer, 0, sizeof(host->timer));
if (stat_irqres && !(stat_irqres->flags & IORESOURCE_DISABLED)) {
unsigned long irqflags = IRQF_SHARED |
(stat_irqres->flags & IRQF_TRIGGER_MASK);
host->stat_irq = stat_irqres->start;
ret = request_irq(host->stat_irq,
msmsdcc_platform_status_irq,
irqflags,
DRIVER_NAME " (slot)",
host);
if (ret) {
pr_err("%s: Unable to get slot IRQ %d (%d)\n",
mmc_hostname(mmc), host->stat_irq, ret);
goto clk_disable;
}
} else if (plat->register_status_notify) {
plat->register_status_notify(msmsdcc_status_notify_cb, host);
} else if (!plat->status)
pr_err("%s: No card detect facilities available\n",
mmc_hostname(mmc));
else {
init_timer(&host->timer);
host->timer.data = (unsigned long)host;
host->timer.function = msmsdcc_check_status;
host->timer.expires = jiffies + HZ;
add_timer(&host->timer);
}
if (plat->status) {
host->oldstat = host->plat->status(mmc_dev(host->mmc));
host->eject = !host->oldstat;
}
/*
* Setup a command timer. We currently need this due to
* some 'strange' timeout / error handling situations.
*/
init_timer(&host->command_timer);
host->command_timer.data = (unsigned long) host;
host->command_timer.function = msmsdcc_command_expired;
ret = request_irq(cmd_irqres->start, msmsdcc_irq, IRQF_SHARED,
DRIVER_NAME " (cmd)", host);
if (ret)
goto stat_irq_free;
ret = request_irq(pio_irqres->start, msmsdcc_pio_irq, IRQF_SHARED,
DRIVER_NAME " (pio)", host);
if (ret)
goto cmd_irq_free;
mmc_set_drvdata(pdev, mmc);
mmc_add_host(mmc);
pr_info("%s: Qualcomm MSM SDCC at 0x%016llx irq %d,%d dma %d\n",
mmc_hostname(mmc), (unsigned long long)memres->start,
(unsigned int) cmd_irqres->start,
(unsigned int) host->stat_irq, host->dma.channel);
pr_info("%s: 4 bit data mode %s\n", mmc_hostname(mmc),
(mmc->caps & MMC_CAP_4_BIT_DATA ? "enabled" : "disabled"));
pr_info("%s: MMC clock %u -> %u Hz, PCLK %u Hz\n",
mmc_hostname(mmc), msmsdcc_fmin, msmsdcc_fmax, host->pclk_rate);
pr_info("%s: Slot eject status = %d\n", mmc_hostname(mmc), host->eject);
pr_info("%s: Power save feature enable = %d\n",
mmc_hostname(mmc), msmsdcc_pwrsave);
if (host->dma.channel != -1) {
pr_info("%s: DM non-cached buffer at %p, dma_addr 0x%.8x\n",
mmc_hostname(mmc), host->dma.nc, host->dma.nc_busaddr);
pr_info("%s: DM cmd busaddr 0x%.8x, cmdptr busaddr 0x%.8x\n",
mmc_hostname(mmc), host->dma.cmd_busaddr,
host->dma.cmdptr_busaddr);
} else
pr_info("%s: PIO transfer enabled\n", mmc_hostname(mmc));
if (host->timer.function)
pr_info("%s: Polling status mode enabled\n", mmc_hostname(mmc));
return 0;
cmd_irq_free:
free_irq(cmd_irqres->start, host);
stat_irq_free:
if (host->stat_irq)
free_irq(host->stat_irq, host);
clk_disable:
clk_disable(host->clk);
clk_put:
clk_put(host->clk);
pclk_disable:
clk_disable(host->pclk);
pclk_put:
clk_put(host->pclk);
host_free:
mmc_free_host(mmc);
out:
return ret;
}
static int
msmsdcc_suspend(struct platform_device *dev, pm_message_t state)
{
struct mmc_host *mmc = mmc_get_drvdata(dev);
int rc = 0;
if (mmc) {
struct msmsdcc_host *host = mmc_priv(mmc);
if (host->stat_irq)
disable_irq(host->stat_irq);
if (mmc->card && mmc->card->type != MMC_TYPE_SDIO)
rc = mmc_suspend_host(mmc, state);
if (!rc) {
writel(0, host->base + MMCIMASK0);
if (host->clks_on) {
clk_disable(host->clk);
clk_disable(host->pclk);
host->clks_on = 0;
}
}
}
return rc;
}
static int
msmsdcc_resume(struct platform_device *dev)
{
struct mmc_host *mmc = mmc_get_drvdata(dev);
unsigned long flags;
if (mmc) {
struct msmsdcc_host *host = mmc_priv(mmc);
spin_lock_irqsave(&host->lock, flags);
if (!host->clks_on) {
clk_enable(host->pclk);
clk_enable(host->clk);
host->clks_on = 1;
}
writel(host->saved_irq0mask, host->base + MMCIMASK0);
spin_unlock_irqrestore(&host->lock, flags);
if (mmc->card && mmc->card->type != MMC_TYPE_SDIO)
mmc_resume_host(mmc);
if (host->stat_irq)
enable_irq(host->stat_irq);
else if (host->stat_irq)
enable_irq(host->stat_irq);
}
return 0;
}
static struct platform_driver msmsdcc_driver = {
.probe = msmsdcc_probe,
.suspend = msmsdcc_suspend,
.resume = msmsdcc_resume,
.driver = {
.name = "msm_sdcc",
},
};
static int __init msmsdcc_init(void)
{
return platform_driver_register(&msmsdcc_driver);
}
static void __exit msmsdcc_exit(void)
{
platform_driver_unregister(&msmsdcc_driver);
}
module_init(msmsdcc_init);
module_exit(msmsdcc_exit);
MODULE_DESCRIPTION("Qualcomm MSM 7X00A Multimedia Card Interface driver");
MODULE_LICENSE("GPL");