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linux-pinenote/drivers/mmc/host/tmio_mmc.c
Arnd Hannemann 2bd6a93555 mmc: tmio_mmc: fix CMD irq handling 
With current code card insert/eject interrupts will acknowledge outstanding
commands. Normally this seems to be no problem, however if the hardware gets
stuck and no interrupts for CMD_TIMEOUT or CMD_RESPEND are generated, then
inserting and ejecting cards will falsely acknowledge outstanding commands
from the core.

This patch changes the behavior so that CMDs are only acked, if
CMD_TIMEOUT or CMD_RESPEND is received.

Signed-off-by: Arnd Hannemann <arnd@arndnet.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-01-08 23:52:32 -05:00

1413 lines
36 KiB
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/*
* linux/drivers/mmc/tmio_mmc.c
*
* Copyright (C) 2004 Ian Molton
* Copyright (C) 2007 Ian Molton
*
* 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.
*
* Driver for the MMC / SD / SDIO cell found in:
*
* TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
*
* This driver draws mainly on scattered spec sheets, Reverse engineering
* of the toshiba e800 SD driver and some parts of the 2.4 ASIC3 driver (4 bit
* support). (Further 4 bit support from a later datasheet).
*
* TODO:
* Investigate using a workqueue for PIO transfers
* Eliminate FIXMEs
* SDIO support
* Better Power management
* Handle MMC errors better
* double buffer support
*
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/highmem.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/scatterlist.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#define CTL_SD_CMD 0x00
#define CTL_ARG_REG 0x04
#define CTL_STOP_INTERNAL_ACTION 0x08
#define CTL_XFER_BLK_COUNT 0xa
#define CTL_RESPONSE 0x0c
#define CTL_STATUS 0x1c
#define CTL_IRQ_MASK 0x20
#define CTL_SD_CARD_CLK_CTL 0x24
#define CTL_SD_XFER_LEN 0x26
#define CTL_SD_MEM_CARD_OPT 0x28
#define CTL_SD_ERROR_DETAIL_STATUS 0x2c
#define CTL_SD_DATA_PORT 0x30
#define CTL_TRANSACTION_CTL 0x34
#define CTL_SDIO_STATUS 0x36
#define CTL_SDIO_IRQ_MASK 0x38
#define CTL_RESET_SD 0xe0
#define CTL_SDIO_REGS 0x100
#define CTL_CLK_AND_WAIT_CTL 0x138
#define CTL_RESET_SDIO 0x1e0
/* Definitions for values the CTRL_STATUS register can take. */
#define TMIO_STAT_CMDRESPEND 0x00000001
#define TMIO_STAT_DATAEND 0x00000004
#define TMIO_STAT_CARD_REMOVE 0x00000008
#define TMIO_STAT_CARD_INSERT 0x00000010
#define TMIO_STAT_SIGSTATE 0x00000020
#define TMIO_STAT_WRPROTECT 0x00000080
#define TMIO_STAT_CARD_REMOVE_A 0x00000100
#define TMIO_STAT_CARD_INSERT_A 0x00000200
#define TMIO_STAT_SIGSTATE_A 0x00000400
#define TMIO_STAT_CMD_IDX_ERR 0x00010000
#define TMIO_STAT_CRCFAIL 0x00020000
#define TMIO_STAT_STOPBIT_ERR 0x00040000
#define TMIO_STAT_DATATIMEOUT 0x00080000
#define TMIO_STAT_RXOVERFLOW 0x00100000
#define TMIO_STAT_TXUNDERRUN 0x00200000
#define TMIO_STAT_CMDTIMEOUT 0x00400000
#define TMIO_STAT_RXRDY 0x01000000
#define TMIO_STAT_TXRQ 0x02000000
#define TMIO_STAT_ILL_FUNC 0x20000000
#define TMIO_STAT_CMD_BUSY 0x40000000
#define TMIO_STAT_ILL_ACCESS 0x80000000
/* Definitions for values the CTRL_SDIO_STATUS register can take. */
#define TMIO_SDIO_STAT_IOIRQ 0x0001
#define TMIO_SDIO_STAT_EXPUB52 0x4000
#define TMIO_SDIO_STAT_EXWT 0x8000
#define TMIO_SDIO_MASK_ALL 0xc007
/* Define some IRQ masks */
/* This is the mask used at reset by the chip */
#define TMIO_MASK_ALL 0x837f031d
#define TMIO_MASK_READOP (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND)
#define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND)
#define TMIO_MASK_CMD (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
#define TMIO_MASK_IRQ (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)
#define enable_mmc_irqs(host, i) \
do { \
u32 mask;\
mask = sd_ctrl_read32((host), CTL_IRQ_MASK); \
mask &= ~((i) & TMIO_MASK_IRQ); \
sd_ctrl_write32((host), CTL_IRQ_MASK, mask); \
} while (0)
#define disable_mmc_irqs(host, i) \
do { \
u32 mask;\
mask = sd_ctrl_read32((host), CTL_IRQ_MASK); \
mask |= ((i) & TMIO_MASK_IRQ); \
sd_ctrl_write32((host), CTL_IRQ_MASK, mask); \
} while (0)
#define ack_mmc_irqs(host, i) \
do { \
sd_ctrl_write32((host), CTL_STATUS, ~(i)); \
} while (0)
/* This is arbitrary, just noone needed any higher alignment yet */
#define MAX_ALIGN 4
struct tmio_mmc_host {
void __iomem *ctl;
unsigned long bus_shift;
struct mmc_command *cmd;
struct mmc_request *mrq;
struct mmc_data *data;
struct mmc_host *mmc;
int irq;
unsigned int sdio_irq_enabled;
/* Callbacks for clock / power control */
void (*set_pwr)(struct platform_device *host, int state);
void (*set_clk_div)(struct platform_device *host, int state);
/* pio related stuff */
struct scatterlist *sg_ptr;
struct scatterlist *sg_orig;
unsigned int sg_len;
unsigned int sg_off;
struct platform_device *pdev;
/* DMA support */
struct dma_chan *chan_rx;
struct dma_chan *chan_tx;
struct tasklet_struct dma_complete;
struct tasklet_struct dma_issue;
#ifdef CONFIG_TMIO_MMC_DMA
unsigned int dma_sglen;
u8 bounce_buf[PAGE_CACHE_SIZE] __attribute__((aligned(MAX_ALIGN)));
struct scatterlist bounce_sg;
#endif
/* Track lost interrupts */
struct delayed_work delayed_reset_work;
spinlock_t lock;
unsigned long last_req_ts;
};
static void tmio_check_bounce_buffer(struct tmio_mmc_host *host);
static u16 sd_ctrl_read16(struct tmio_mmc_host *host, int addr)
{
return readw(host->ctl + (addr << host->bus_shift));
}
static void sd_ctrl_read16_rep(struct tmio_mmc_host *host, int addr,
u16 *buf, int count)
{
readsw(host->ctl + (addr << host->bus_shift), buf, count);
}
static u32 sd_ctrl_read32(struct tmio_mmc_host *host, int addr)
{
return readw(host->ctl + (addr << host->bus_shift)) |
readw(host->ctl + ((addr + 2) << host->bus_shift)) << 16;
}
static void sd_ctrl_write16(struct tmio_mmc_host *host, int addr, u16 val)
{
writew(val, host->ctl + (addr << host->bus_shift));
}
static void sd_ctrl_write16_rep(struct tmio_mmc_host *host, int addr,
u16 *buf, int count)
{
writesw(host->ctl + (addr << host->bus_shift), buf, count);
}
static void sd_ctrl_write32(struct tmio_mmc_host *host, int addr, u32 val)
{
writew(val, host->ctl + (addr << host->bus_shift));
writew(val >> 16, host->ctl + ((addr + 2) << host->bus_shift));
}
static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
{
host->sg_len = data->sg_len;
host->sg_ptr = data->sg;
host->sg_orig = data->sg;
host->sg_off = 0;
}
static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
{
host->sg_ptr = sg_next(host->sg_ptr);
host->sg_off = 0;
return --host->sg_len;
}
static char *tmio_mmc_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
{
local_irq_save(*flags);
return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
}
static void tmio_mmc_kunmap_atomic(void *virt, unsigned long *flags)
{
kunmap_atomic(virt, KM_BIO_SRC_IRQ);
local_irq_restore(*flags);
}
#ifdef CONFIG_MMC_DEBUG
#define STATUS_TO_TEXT(a) \
do { \
if (status & TMIO_STAT_##a) \
printk(#a); \
} while (0)
void pr_debug_status(u32 status)
{
printk(KERN_DEBUG "status: %08x = ", status);
STATUS_TO_TEXT(CARD_REMOVE);
STATUS_TO_TEXT(CARD_INSERT);
STATUS_TO_TEXT(SIGSTATE);
STATUS_TO_TEXT(WRPROTECT);
STATUS_TO_TEXT(CARD_REMOVE_A);
STATUS_TO_TEXT(CARD_INSERT_A);
STATUS_TO_TEXT(SIGSTATE_A);
STATUS_TO_TEXT(CMD_IDX_ERR);
STATUS_TO_TEXT(STOPBIT_ERR);
STATUS_TO_TEXT(ILL_FUNC);
STATUS_TO_TEXT(CMD_BUSY);
STATUS_TO_TEXT(CMDRESPEND);
STATUS_TO_TEXT(DATAEND);
STATUS_TO_TEXT(CRCFAIL);
STATUS_TO_TEXT(DATATIMEOUT);
STATUS_TO_TEXT(CMDTIMEOUT);
STATUS_TO_TEXT(RXOVERFLOW);
STATUS_TO_TEXT(TXUNDERRUN);
STATUS_TO_TEXT(RXRDY);
STATUS_TO_TEXT(TXRQ);
STATUS_TO_TEXT(ILL_ACCESS);
printk("\n");
}
#else
#define pr_debug_status(s) do { } while (0)
#endif
static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
if (enable) {
host->sdio_irq_enabled = 1;
sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK,
(TMIO_SDIO_MASK_ALL & ~TMIO_SDIO_STAT_IOIRQ));
} else {
sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, TMIO_SDIO_MASK_ALL);
sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
host->sdio_irq_enabled = 0;
}
}
static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
{
u32 clk = 0, clock;
if (new_clock) {
for (clock = host->mmc->f_min, clk = 0x80000080;
new_clock >= (clock<<1); clk >>= 1)
clock <<= 1;
clk |= 0x100;
}
if (host->set_clk_div)
host->set_clk_div(host->pdev, (clk>>22) & 1);
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & 0x1ff);
}
static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
{
struct mfd_cell *cell = host->pdev->dev.platform_data;
struct tmio_mmc_data *pdata = cell->driver_data;
/*
* Testing on sh-mobile showed that SDIO IRQs are unmasked when
* CTL_CLK_AND_WAIT_CTL gets written, so we have to disable the
* device IRQ here and restore the SDIO IRQ mask before
* re-enabling the device IRQ.
*/
if (pdata->flags & TMIO_MMC_SDIO_IRQ)
disable_irq(host->irq);
sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
msleep(10);
if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled);
enable_irq(host->irq);
}
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
msleep(10);
}
static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
{
struct mfd_cell *cell = host->pdev->dev.platform_data;
struct tmio_mmc_data *pdata = cell->driver_data;
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
msleep(10);
/* see comment in tmio_mmc_clk_stop above */
if (pdata->flags & TMIO_MMC_SDIO_IRQ)
disable_irq(host->irq);
sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
msleep(10);
if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled);
enable_irq(host->irq);
}
}
static void reset(struct tmio_mmc_host *host)
{
/* FIXME - should we set stop clock reg here */
sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
msleep(10);
sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
msleep(10);
}
static void tmio_mmc_reset_work(struct work_struct *work)
{
struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
delayed_reset_work.work);
struct mmc_request *mrq;
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
mrq = host->mrq;
/* request already finished */
if (!mrq
|| time_is_after_jiffies(host->last_req_ts +
msecs_to_jiffies(2000))) {
spin_unlock_irqrestore(&host->lock, flags);
return;
}
dev_warn(&host->pdev->dev,
"timeout waiting for hardware interrupt (CMD%u)\n",
mrq->cmd->opcode);
if (host->data)
host->data->error = -ETIMEDOUT;
else if (host->cmd)
host->cmd->error = -ETIMEDOUT;
else
mrq->cmd->error = -ETIMEDOUT;
host->cmd = NULL;
host->data = NULL;
host->mrq = NULL;
spin_unlock_irqrestore(&host->lock, flags);
reset(host);
mmc_request_done(host->mmc, mrq);
}
static void
tmio_mmc_finish_request(struct tmio_mmc_host *host)
{
struct mmc_request *mrq = host->mrq;
if (!mrq)
return;
host->mrq = NULL;
host->cmd = NULL;
host->data = NULL;
cancel_delayed_work(&host->delayed_reset_work);
mmc_request_done(host->mmc, mrq);
}
/* These are the bitmasks the tmio chip requires to implement the MMC response
* types. Note that R1 and R6 are the same in this scheme. */
#define APP_CMD 0x0040
#define RESP_NONE 0x0300
#define RESP_R1 0x0400
#define RESP_R1B 0x0500
#define RESP_R2 0x0600
#define RESP_R3 0x0700
#define DATA_PRESENT 0x0800
#define TRANSFER_READ 0x1000
#define TRANSFER_MULTI 0x2000
#define SECURITY_CMD 0x4000
static int
tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
{
struct mmc_data *data = host->data;
int c = cmd->opcode;
/* Command 12 is handled by hardware */
if (cmd->opcode == 12 && !cmd->arg) {
sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x001);
return 0;
}
switch (mmc_resp_type(cmd)) {
case MMC_RSP_NONE: c |= RESP_NONE; break;
case MMC_RSP_R1: c |= RESP_R1; break;
case MMC_RSP_R1B: c |= RESP_R1B; break;
case MMC_RSP_R2: c |= RESP_R2; break;
case MMC_RSP_R3: c |= RESP_R3; break;
default:
pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
return -EINVAL;
}
host->cmd = cmd;
/* FIXME - this seems to be ok commented out but the spec suggest this bit
* should be set when issuing app commands.
* if(cmd->flags & MMC_FLAG_ACMD)
* c |= APP_CMD;
*/
if (data) {
c |= DATA_PRESENT;
if (data->blocks > 1) {
sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x100);
c |= TRANSFER_MULTI;
}
if (data->flags & MMC_DATA_READ)
c |= TRANSFER_READ;
}
enable_mmc_irqs(host, TMIO_MASK_CMD);
/* Fire off the command */
sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
sd_ctrl_write16(host, CTL_SD_CMD, c);
return 0;
}
/*
* This chip always returns (at least?) as much data as you ask for.
* I'm unsure what happens if you ask for less than a block. This should be
* looked into to ensure that a funny length read doesnt hose the controller.
*/
static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
{
struct mmc_data *data = host->data;
void *sg_virt;
unsigned short *buf;
unsigned int count;
unsigned long flags;
if (!data) {
pr_debug("Spurious PIO IRQ\n");
return;
}
sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
buf = (unsigned short *)(sg_virt + host->sg_off);
count = host->sg_ptr->length - host->sg_off;
if (count > data->blksz)
count = data->blksz;
pr_debug("count: %08x offset: %08x flags %08x\n",
count, host->sg_off, data->flags);
/* Transfer the data */
if (data->flags & MMC_DATA_READ)
sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
else
sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
host->sg_off += count;
tmio_mmc_kunmap_atomic(sg_virt, &flags);
if (host->sg_off == host->sg_ptr->length)
tmio_mmc_next_sg(host);
return;
}
/* needs to be called with host->lock held */
static void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
{
struct mmc_data *data = host->data;
struct mmc_command *stop;
host->data = NULL;
if (!data) {
dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
return;
}
stop = data->stop;
/* FIXME - return correct transfer count on errors */
if (!data->error)
data->bytes_xfered = data->blocks * data->blksz;
else
data->bytes_xfered = 0;
pr_debug("Completed data request\n");
/*
* FIXME: other drivers allow an optional stop command of any given type
* which we dont do, as the chip can auto generate them.
* Perhaps we can be smarter about when to use auto CMD12 and
* only issue the auto request when we know this is the desired
* stop command, allowing fallback to the stop command the
* upper layers expect. For now, we do what works.
*/
if (data->flags & MMC_DATA_READ) {
if (!host->chan_rx)
disable_mmc_irqs(host, TMIO_MASK_READOP);
else
tmio_check_bounce_buffer(host);
dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
host->mrq);
} else {
if (!host->chan_tx)
disable_mmc_irqs(host, TMIO_MASK_WRITEOP);
dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
host->mrq);
}
if (stop) {
if (stop->opcode == 12 && !stop->arg)
sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000);
else
BUG();
}
tmio_mmc_finish_request(host);
}
static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
{
struct mmc_data *data;
spin_lock(&host->lock);
data = host->data;
if (!data)
goto out;
if (host->chan_tx && (data->flags & MMC_DATA_WRITE)) {
/*
* Has all data been written out yet? Testing on SuperH showed,
* that in most cases the first interrupt comes already with the
* BUSY status bit clear, but on some operations, like mount or
* in the beginning of a write / sync / umount, there is one
* DATAEND interrupt with the BUSY bit set, in this cases
* waiting for one more interrupt fixes the problem.
*/
if (!(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_CMD_BUSY)) {
disable_mmc_irqs(host, TMIO_STAT_DATAEND);
tasklet_schedule(&host->dma_complete);
}
} else if (host->chan_rx && (data->flags & MMC_DATA_READ)) {
disable_mmc_irqs(host, TMIO_STAT_DATAEND);
tasklet_schedule(&host->dma_complete);
} else {
tmio_mmc_do_data_irq(host);
}
out:
spin_unlock(&host->lock);
}
static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
unsigned int stat)
{
struct mmc_command *cmd = host->cmd;
int i, addr;
spin_lock(&host->lock);
if (!host->cmd) {
pr_debug("Spurious CMD irq\n");
goto out;
}
host->cmd = NULL;
/* This controller is sicker than the PXA one. Not only do we need to
* drop the top 8 bits of the first response word, we also need to
* modify the order of the response for short response command types.
*/
for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
cmd->resp[i] = sd_ctrl_read32(host, addr);
if (cmd->flags & MMC_RSP_136) {
cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
cmd->resp[3] <<= 8;
} else if (cmd->flags & MMC_RSP_R3) {
cmd->resp[0] = cmd->resp[3];
}
if (stat & TMIO_STAT_CMDTIMEOUT)
cmd->error = -ETIMEDOUT;
else if (stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC)
cmd->error = -EILSEQ;
/* If there is data to handle we enable data IRQs here, and
* we will ultimatley finish the request in the data_end handler.
* If theres no data or we encountered an error, finish now.
*/
if (host->data && !cmd->error) {
if (host->data->flags & MMC_DATA_READ) {
if (!host->chan_rx)
enable_mmc_irqs(host, TMIO_MASK_READOP);
} else {
if (!host->chan_tx)
enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
else
tasklet_schedule(&host->dma_issue);
}
} else {
tmio_mmc_finish_request(host);
}
out:
spin_unlock(&host->lock);
return;
}
static irqreturn_t tmio_mmc_irq(int irq, void *devid)
{
struct tmio_mmc_host *host = devid;
struct mfd_cell *cell = host->pdev->dev.platform_data;
struct tmio_mmc_data *pdata = cell->driver_data;
unsigned int ireg, irq_mask, status;
unsigned int sdio_ireg, sdio_irq_mask, sdio_status;
pr_debug("MMC IRQ begin\n");
status = sd_ctrl_read32(host, CTL_STATUS);
irq_mask = sd_ctrl_read32(host, CTL_IRQ_MASK);
ireg = status & TMIO_MASK_IRQ & ~irq_mask;
sdio_ireg = 0;
if (!ireg && pdata->flags & TMIO_MMC_SDIO_IRQ) {
sdio_status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
sdio_irq_mask = sd_ctrl_read16(host, CTL_SDIO_IRQ_MASK);
sdio_ireg = sdio_status & TMIO_SDIO_MASK_ALL & ~sdio_irq_mask;
sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status & ~TMIO_SDIO_MASK_ALL);
if (sdio_ireg && !host->sdio_irq_enabled) {
pr_warning("tmio_mmc: Spurious SDIO IRQ, disabling! 0x%04x 0x%04x 0x%04x\n",
sdio_status, sdio_irq_mask, sdio_ireg);
tmio_mmc_enable_sdio_irq(host->mmc, 0);
goto out;
}
if (host->mmc->caps & MMC_CAP_SDIO_IRQ &&
sdio_ireg & TMIO_SDIO_STAT_IOIRQ)
mmc_signal_sdio_irq(host->mmc);
if (sdio_ireg)
goto out;
}
pr_debug_status(status);
pr_debug_status(ireg);
if (!ireg) {
disable_mmc_irqs(host, status & ~irq_mask);
pr_warning("tmio_mmc: Spurious irq, disabling! "
"0x%08x 0x%08x 0x%08x\n", status, irq_mask, ireg);
pr_debug_status(status);
goto out;
}
while (ireg) {
/* Card insert / remove attempts */
if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
TMIO_STAT_CARD_REMOVE);
mmc_detect_change(host->mmc, msecs_to_jiffies(100));
}
/* CRC and other errors */
/* if (ireg & TMIO_STAT_ERR_IRQ)
* handled |= tmio_error_irq(host, irq, stat);
*/
/* Command completion */
if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
ack_mmc_irqs(host,
TMIO_STAT_CMDRESPEND |
TMIO_STAT_CMDTIMEOUT);
tmio_mmc_cmd_irq(host, status);
}
/* Data transfer */
if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
tmio_mmc_pio_irq(host);
}
/* Data transfer completion */
if (ireg & TMIO_STAT_DATAEND) {
ack_mmc_irqs(host, TMIO_STAT_DATAEND);
tmio_mmc_data_irq(host);
}
/* Check status - keep going until we've handled it all */
status = sd_ctrl_read32(host, CTL_STATUS);
irq_mask = sd_ctrl_read32(host, CTL_IRQ_MASK);
ireg = status & TMIO_MASK_IRQ & ~irq_mask;
pr_debug("Status at end of loop: %08x\n", status);
pr_debug_status(status);
}
pr_debug("MMC IRQ end\n");
out:
return IRQ_HANDLED;
}
#ifdef CONFIG_TMIO_MMC_DMA
static void tmio_check_bounce_buffer(struct tmio_mmc_host *host)
{
if (host->sg_ptr == &host->bounce_sg) {
unsigned long flags;
void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags);
memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length);
tmio_mmc_kunmap_atomic(sg_vaddr, &flags);
}
}
static void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
{
#if defined(CONFIG_SUPERH) || defined(CONFIG_ARCH_SHMOBILE)
/* Switch DMA mode on or off - SuperH specific? */
sd_ctrl_write16(host, 0xd8, enable ? 2 : 0);
#endif
}
static void tmio_dma_complete(void *arg)
{
struct tmio_mmc_host *host = arg;
dev_dbg(&host->pdev->dev, "Command completed\n");
if (!host->data)
dev_warn(&host->pdev->dev, "NULL data in DMA completion!\n");
else
enable_mmc_irqs(host, TMIO_STAT_DATAEND);
}
static void tmio_mmc_start_dma_rx(struct tmio_mmc_host *host)
{
struct scatterlist *sg = host->sg_ptr, *sg_tmp;
struct dma_async_tx_descriptor *desc = NULL;
struct dma_chan *chan = host->chan_rx;
struct mfd_cell *cell = host->pdev->dev.platform_data;
struct tmio_mmc_data *pdata = cell->driver_data;
dma_cookie_t cookie;
int ret, i;
bool aligned = true, multiple = true;
unsigned int align = (1 << pdata->dma->alignment_shift) - 1;
for_each_sg(sg, sg_tmp, host->sg_len, i) {
if (sg_tmp->offset & align)
aligned = false;
if (sg_tmp->length & align) {
multiple = false;
break;
}
}
if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_CACHE_SIZE ||
align >= MAX_ALIGN)) || !multiple) {
ret = -EINVAL;
goto pio;
}
/* The only sg element can be unaligned, use our bounce buffer then */
if (!aligned) {
sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
host->sg_ptr = &host->bounce_sg;
sg = host->sg_ptr;
}
ret = dma_map_sg(&host->pdev->dev, sg, host->sg_len, DMA_FROM_DEVICE);
if (ret > 0) {
host->dma_sglen = ret;
desc = chan->device->device_prep_slave_sg(chan, sg, ret,
DMA_FROM_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
}
if (desc) {
desc->callback = tmio_dma_complete;
desc->callback_param = host;
cookie = desc->tx_submit(desc);
if (cookie < 0) {
desc = NULL;
ret = cookie;
} else {
chan->device->device_issue_pending(chan);
}
}
dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n",
__func__, host->sg_len, ret, cookie, host->mrq);
pio:
if (!desc) {
/* DMA failed, fall back to PIO */
if (ret >= 0)
ret = -EIO;
host->chan_rx = NULL;
dma_release_channel(chan);
/* Free the Tx channel too */
chan = host->chan_tx;
if (chan) {
host->chan_tx = NULL;
dma_release_channel(chan);
}
dev_warn(&host->pdev->dev,
"DMA failed: %d, falling back to PIO\n", ret);
tmio_mmc_enable_dma(host, false);
}
dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__,
desc, cookie, host->sg_len);
}
static void tmio_mmc_start_dma_tx(struct tmio_mmc_host *host)
{
struct scatterlist *sg = host->sg_ptr, *sg_tmp;
struct dma_async_tx_descriptor *desc = NULL;
struct dma_chan *chan = host->chan_tx;
struct mfd_cell *cell = host->pdev->dev.platform_data;
struct tmio_mmc_data *pdata = cell->driver_data;
dma_cookie_t cookie;
int ret, i;
bool aligned = true, multiple = true;
unsigned int align = (1 << pdata->dma->alignment_shift) - 1;
for_each_sg(sg, sg_tmp, host->sg_len, i) {
if (sg_tmp->offset & align)
aligned = false;
if (sg_tmp->length & align) {
multiple = false;
break;
}
}
if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_CACHE_SIZE ||
align >= MAX_ALIGN)) || !multiple) {
ret = -EINVAL;
goto pio;
}
/* The only sg element can be unaligned, use our bounce buffer then */
if (!aligned) {
unsigned long flags;
void *sg_vaddr = tmio_mmc_kmap_atomic(sg, &flags);
sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
memcpy(host->bounce_buf, sg_vaddr, host->bounce_sg.length);
tmio_mmc_kunmap_atomic(sg_vaddr, &flags);
host->sg_ptr = &host->bounce_sg;
sg = host->sg_ptr;
}
ret = dma_map_sg(&host->pdev->dev, sg, host->sg_len, DMA_TO_DEVICE);
if (ret > 0) {
host->dma_sglen = ret;
desc = chan->device->device_prep_slave_sg(chan, sg, ret,
DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
}
if (desc) {
desc->callback = tmio_dma_complete;
desc->callback_param = host;
cookie = desc->tx_submit(desc);
if (cookie < 0) {
desc = NULL;
ret = cookie;
}
}
dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n",
__func__, host->sg_len, ret, cookie, host->mrq);
pio:
if (!desc) {
/* DMA failed, fall back to PIO */
if (ret >= 0)
ret = -EIO;
host->chan_tx = NULL;
dma_release_channel(chan);
/* Free the Rx channel too */
chan = host->chan_rx;
if (chan) {
host->chan_rx = NULL;
dma_release_channel(chan);
}
dev_warn(&host->pdev->dev,
"DMA failed: %d, falling back to PIO\n", ret);
tmio_mmc_enable_dma(host, false);
}
dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d\n", __func__,
desc, cookie);
}
static void tmio_mmc_start_dma(struct tmio_mmc_host *host,
struct mmc_data *data)
{
if (data->flags & MMC_DATA_READ) {
if (host->chan_rx)
tmio_mmc_start_dma_rx(host);
} else {
if (host->chan_tx)
tmio_mmc_start_dma_tx(host);
}
}
static void tmio_issue_tasklet_fn(unsigned long priv)
{
struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv;
struct dma_chan *chan = host->chan_tx;
chan->device->device_issue_pending(chan);
}
static void tmio_tasklet_fn(unsigned long arg)
{
struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg;
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
if (!host->data)
goto out;
if (host->data->flags & MMC_DATA_READ)
dma_unmap_sg(&host->pdev->dev, host->sg_ptr, host->dma_sglen,
DMA_FROM_DEVICE);
else
dma_unmap_sg(&host->pdev->dev, host->sg_ptr, host->dma_sglen,
DMA_TO_DEVICE);
tmio_mmc_do_data_irq(host);
out:
spin_unlock_irqrestore(&host->lock, flags);
}
/* It might be necessary to make filter MFD specific */
static bool tmio_mmc_filter(struct dma_chan *chan, void *arg)
{
dev_dbg(chan->device->dev, "%s: slave data %p\n", __func__, arg);
chan->private = arg;
return true;
}
static void tmio_mmc_request_dma(struct tmio_mmc_host *host,
struct tmio_mmc_data *pdata)
{
/* We can only either use DMA for both Tx and Rx or not use it at all */
if (pdata->dma) {
dma_cap_mask_t mask;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
host->chan_tx = dma_request_channel(mask, tmio_mmc_filter,
pdata->dma->chan_priv_tx);
dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__,
host->chan_tx);
if (!host->chan_tx)
return;
host->chan_rx = dma_request_channel(mask, tmio_mmc_filter,
pdata->dma->chan_priv_rx);
dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__,
host->chan_rx);
if (!host->chan_rx) {
dma_release_channel(host->chan_tx);
host->chan_tx = NULL;
return;
}
tasklet_init(&host->dma_complete, tmio_tasklet_fn, (unsigned long)host);
tasklet_init(&host->dma_issue, tmio_issue_tasklet_fn, (unsigned long)host);
tmio_mmc_enable_dma(host, true);
}
}
static void tmio_mmc_release_dma(struct tmio_mmc_host *host)
{
if (host->chan_tx) {
struct dma_chan *chan = host->chan_tx;
host->chan_tx = NULL;
dma_release_channel(chan);
}
if (host->chan_rx) {
struct dma_chan *chan = host->chan_rx;
host->chan_rx = NULL;
dma_release_channel(chan);
}
}
#else
static void tmio_check_bounce_buffer(struct tmio_mmc_host *host)
{
}
static void tmio_mmc_start_dma(struct tmio_mmc_host *host,
struct mmc_data *data)
{
}
static void tmio_mmc_request_dma(struct tmio_mmc_host *host,
struct tmio_mmc_data *pdata)
{
host->chan_tx = NULL;
host->chan_rx = NULL;
}
static void tmio_mmc_release_dma(struct tmio_mmc_host *host)
{
}
#endif
static int tmio_mmc_start_data(struct tmio_mmc_host *host,
struct mmc_data *data)
{
struct mfd_cell *cell = host->pdev->dev.platform_data;
struct tmio_mmc_data *pdata = cell->driver_data;
pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
data->blksz, data->blocks);
/* Some hardware cannot perform 2 byte requests in 4 bit mode */
if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
pr_err("%s: %d byte block unsupported in 4 bit mode\n",
mmc_hostname(host->mmc), data->blksz);
return -EINVAL;
}
}
tmio_mmc_init_sg(host, data);
host->data = data;
/* Set transfer length / blocksize */
sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
tmio_mmc_start_dma(host, data);
return 0;
}
/* Process requests from the MMC layer */
static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
int ret;
if (host->mrq)
pr_debug("request not null\n");
host->last_req_ts = jiffies;
wmb();
host->mrq = mrq;
if (mrq->data) {
ret = tmio_mmc_start_data(host, mrq->data);
if (ret)
goto fail;
}
ret = tmio_mmc_start_command(host, mrq->cmd);
if (!ret) {
schedule_delayed_work(&host->delayed_reset_work,
msecs_to_jiffies(2000));
return;
}
fail:
host->mrq = NULL;
mrq->cmd->error = ret;
mmc_request_done(mmc, mrq);
}
/* Set MMC clock / power.
* Note: This controller uses a simple divider scheme therefore it cannot
* run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
* MMC wont run that fast, it has to be clocked at 12MHz which is the next
* slowest setting.
*/
static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
if (ios->clock)
tmio_mmc_set_clock(host, ios->clock);
/* Power sequence - OFF -> ON -> UP */
switch (ios->power_mode) {
case MMC_POWER_OFF: /* power down SD bus */
if (host->set_pwr)
host->set_pwr(host->pdev, 0);
tmio_mmc_clk_stop(host);
break;
case MMC_POWER_ON: /* power up SD bus */
if (host->set_pwr)
host->set_pwr(host->pdev, 1);
break;
case MMC_POWER_UP: /* start bus clock */
tmio_mmc_clk_start(host);
break;
}
switch (ios->bus_width) {
case MMC_BUS_WIDTH_1:
sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
break;
case MMC_BUS_WIDTH_4:
sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
break;
}
/* Let things settle. delay taken from winCE driver */
udelay(140);
}
static int tmio_mmc_get_ro(struct mmc_host *mmc)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
struct mfd_cell *cell = host->pdev->dev.platform_data;
struct tmio_mmc_data *pdata = cell->driver_data;
return ((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT)) ? 0 : 1;
}
static int tmio_mmc_get_cd(struct mmc_host *mmc)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
struct mfd_cell *cell = host->pdev->dev.platform_data;
struct tmio_mmc_data *pdata = cell->driver_data;
if (!pdata->get_cd)
return -ENOSYS;
else
return pdata->get_cd(host->pdev);
}
static const struct mmc_host_ops tmio_mmc_ops = {
.request = tmio_mmc_request,
.set_ios = tmio_mmc_set_ios,
.get_ro = tmio_mmc_get_ro,
.get_cd = tmio_mmc_get_cd,
.enable_sdio_irq = tmio_mmc_enable_sdio_irq,
};
#ifdef CONFIG_PM
static int tmio_mmc_suspend(struct platform_device *dev, pm_message_t state)
{
struct mfd_cell *cell = (struct mfd_cell *)dev->dev.platform_data;
struct mmc_host *mmc = platform_get_drvdata(dev);
int ret;
ret = mmc_suspend_host(mmc);
/* Tell MFD core it can disable us now.*/
if (!ret && cell->disable)
cell->disable(dev);
return ret;
}
static int tmio_mmc_resume(struct platform_device *dev)
{
struct mfd_cell *cell = (struct mfd_cell *)dev->dev.platform_data;
struct mmc_host *mmc = platform_get_drvdata(dev);
int ret = 0;
/* Tell the MFD core we are ready to be enabled */
if (cell->resume) {
ret = cell->resume(dev);
if (ret)
goto out;
}
mmc_resume_host(mmc);
out:
return ret;
}
#else
#define tmio_mmc_suspend NULL
#define tmio_mmc_resume NULL
#endif
static int __devinit tmio_mmc_probe(struct platform_device *dev)
{
struct mfd_cell *cell = (struct mfd_cell *)dev->dev.platform_data;
struct tmio_mmc_data *pdata;
struct resource *res_ctl;
struct tmio_mmc_host *host;
struct mmc_host *mmc;
int ret = -EINVAL;
u32 irq_mask = TMIO_MASK_CMD;
if (dev->num_resources != 2)
goto out;
res_ctl = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!res_ctl)
goto out;
pdata = cell->driver_data;
if (!pdata || !pdata->hclk)
goto out;
ret = -ENOMEM;
mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &dev->dev);
if (!mmc)
goto out;
host = mmc_priv(mmc);
host->mmc = mmc;
host->pdev = dev;
platform_set_drvdata(dev, mmc);
host->set_pwr = pdata->set_pwr;
host->set_clk_div = pdata->set_clk_div;
/* SD control register space size is 0x200, 0x400 for bus_shift=1 */
host->bus_shift = resource_size(res_ctl) >> 10;
host->ctl = ioremap(res_ctl->start, resource_size(res_ctl));
if (!host->ctl)
goto host_free;
mmc->ops = &tmio_mmc_ops;
mmc->caps = MMC_CAP_4_BIT_DATA | pdata->capabilities;
mmc->f_max = pdata->hclk;
mmc->f_min = mmc->f_max / 512;
mmc->max_segs = 32;
mmc->max_blk_size = 512;
mmc->max_blk_count = (PAGE_CACHE_SIZE / mmc->max_blk_size) *
mmc->max_segs;
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
mmc->max_seg_size = mmc->max_req_size;
if (pdata->ocr_mask)
mmc->ocr_avail = pdata->ocr_mask;
else
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
/* Tell the MFD core we are ready to be enabled */
if (cell->enable) {
ret = cell->enable(dev);
if (ret)
goto unmap_ctl;
}
tmio_mmc_clk_stop(host);
reset(host);
ret = platform_get_irq(dev, 0);
if (ret >= 0)
host->irq = ret;
else
goto cell_disable;
disable_mmc_irqs(host, TMIO_MASK_ALL);
if (pdata->flags & TMIO_MMC_SDIO_IRQ)
tmio_mmc_enable_sdio_irq(mmc, 0);
ret = request_irq(host->irq, tmio_mmc_irq, IRQF_DISABLED |
IRQF_TRIGGER_FALLING, dev_name(&dev->dev), host);
if (ret)
goto cell_disable;
spin_lock_init(&host->lock);
/* Init delayed work for request timeouts */
INIT_DELAYED_WORK(&host->delayed_reset_work, tmio_mmc_reset_work);
/* See if we also get DMA */
tmio_mmc_request_dma(host, pdata);
mmc_add_host(mmc);
pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
(unsigned long)host->ctl, host->irq);
/* Unmask the IRQs we want to know about */
if (!host->chan_rx)
irq_mask |= TMIO_MASK_READOP;
if (!host->chan_tx)
irq_mask |= TMIO_MASK_WRITEOP;
enable_mmc_irqs(host, irq_mask);
return 0;
cell_disable:
if (cell->disable)
cell->disable(dev);
unmap_ctl:
iounmap(host->ctl);
host_free:
mmc_free_host(mmc);
out:
return ret;
}
static int __devexit tmio_mmc_remove(struct platform_device *dev)
{
struct mfd_cell *cell = (struct mfd_cell *)dev->dev.platform_data;
struct mmc_host *mmc = platform_get_drvdata(dev);
platform_set_drvdata(dev, NULL);
if (mmc) {
struct tmio_mmc_host *host = mmc_priv(mmc);
mmc_remove_host(mmc);
cancel_delayed_work_sync(&host->delayed_reset_work);
tmio_mmc_release_dma(host);
free_irq(host->irq, host);
if (cell->disable)
cell->disable(dev);
iounmap(host->ctl);
mmc_free_host(mmc);
}
return 0;
}
/* ------------------- device registration ----------------------- */
static struct platform_driver tmio_mmc_driver = {
.driver = {
.name = "tmio-mmc",
.owner = THIS_MODULE,
},
.probe = tmio_mmc_probe,
.remove = __devexit_p(tmio_mmc_remove),
.suspend = tmio_mmc_suspend,
.resume = tmio_mmc_resume,
};
static int __init tmio_mmc_init(void)
{
return platform_driver_register(&tmio_mmc_driver);
}
static void __exit tmio_mmc_exit(void)
{
platform_driver_unregister(&tmio_mmc_driver);
}
module_init(tmio_mmc_init);
module_exit(tmio_mmc_exit);
MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tmio-mmc");
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