- 根目录:
- drivers
- mmc
- host
- tmio_mmc_pio.c
/*
* linux/drivers/mmc/host/tmio_mmc_pio.c
*
* Copyright (C) 2011 Guennadi Liakhovetski
* Copyright (C) 2007 Ian Molton
* Copyright (C) 2004 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 IP found in:
*
* TC6393XB, TC6391XB, TC6387XB, T7L66XB, ASIC3, SH-Mobile SoCs
*
* 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/highmem.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/mfd/tmio.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/mmc/tmio.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/platform_device.h>
#include <linux/pm_qos.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/mmc/sdio.h>
#include <linux/scatterlist.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include "tmio_mmc.h"
void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
{
host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ);
sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
}
void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
{
host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ);
sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
}
static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
{
sd_ctrl_write32(host, CTL_STATUS, ~i);
}
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;
}
#ifdef CONFIG_MMC_DEBUG
#define STATUS_TO_TEXT(a, status, i) \
do { \
if (status & TMIO_STAT_##a) { \
if (i++) \
printk(" | "); \
printk(#a); \
} \
} while (0)
static void pr_debug_status(u32 status)
{
int i = 0;
pr_debug("status: %08x = ", status);
STATUS_TO_TEXT(CARD_REMOVE, status, i);
STATUS_TO_TEXT(CARD_INSERT, status, i);
STATUS_TO_TEXT(SIGSTATE, status, i);
STATUS_TO_TEXT(WRPROTECT, status, i);
STATUS_TO_TEXT(CARD_REMOVE_A, status, i);
STATUS_TO_TEXT(CARD_INSERT_A, status, i);
STATUS_TO_TEXT(SIGSTATE_A, status, i);
STATUS_TO_TEXT(CMD_IDX_ERR, status, i);
STATUS_TO_TEXT(STOPBIT_ERR, status, i);
STATUS_TO_TEXT(ILL_FUNC, status, i);
STATUS_TO_TEXT(CMD_BUSY, status, i);
STATUS_TO_TEXT(CMDRESPEND, status, i);
STATUS_TO_TEXT(DATAEND, status, i);
STATUS_TO_TEXT(CRCFAIL, status, i);
STATUS_TO_TEXT(DATATIMEOUT, status, i);
STATUS_TO_TEXT(CMDTIMEOUT, status, i);
STATUS_TO_TEXT(RXOVERFLOW, status, i);
STATUS_TO_TEXT(TXUNDERRUN, status, i);
STATUS_TO_TEXT(RXRDY, status, i);
STATUS_TO_TEXT(TXRQ, status, i);
STATUS_TO_TEXT(ILL_ACCESS, status, i);
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) {
/* Keep device active while SDIO irq is enabled */
pm_runtime_get_sync(mmc_dev(mmc));
host->sdio_irq_enabled = true;
host->sdio_irq_mask = TMIO_SDIO_MASK_ALL &
~TMIO_SDIO_STAT_IOIRQ;
sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
} else if (!enable && host->sdio_irq_enabled) {
host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
host->sdio_irq_enabled = false;
pm_runtime_mark_last_busy(mmc_dev(mmc));
pm_runtime_put_autosuspend(mmc_dev(mmc));
}
}
static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
unsigned 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;
/* 1/1 clock is option */
if ((host->pdata->flags & TMIO_MMC_CLK_ACTUAL) &&
((clk >> 22) & 0x1))
clk |= 0xff;
}
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);
msleep(10);
}
static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
{
/* implicit BUG_ON(!res) */
if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
msleep(10);
}
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)
{
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
msleep(10);
/* implicit BUG_ON(!res) */
if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
msleep(10);
}
}
static void tmio_mmc_reset(struct tmio_mmc_host *host)
{
/* FIXME - should we set stop clock reg here */
sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
/* implicit BUG_ON(!res) */
if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
msleep(10);
sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
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;
/*
* is request already finished? Since we use a non-blocking
* cancel_delayed_work(), it can happen, that a .set_ios() call preempts
* us, so, have to check for IS_ERR(host->mrq)
*/
if (IS_ERR_OR_NULL(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->force_pio = false;
spin_unlock_irqrestore(&host->lock, flags);
tmio_mmc_reset(host);
/* Ready for new calls */
host->mrq = NULL;
tmio_mmc_abort_dma(host);
mmc_request_done(host->mmc, mrq);
pm_runtime_mark_last_busy(mmc_dev(host->mmc));
pm_runtime_put_autosuspend(mmc_dev(host->mmc));
}
/* called with host->lock held, interrupts disabled */
static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
{
struct mmc_request *mrq;
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
mrq = host->mrq;
if (IS_ERR_OR_NULL(mrq)) {
spin_unlock_irqrestore(&host->lock, flags);
return;
}
host->cmd = NULL;
host->data = NULL;
host->force_pio = false;
cancel_delayed_work(&host->delayed_reset_work);
host->mrq = NULL;
spin_unlock_irqrestore(&host->lock, flags);
if (mrq->cmd->error || (mrq->data && mrq->data->error))
tmio_mmc_abort_dma(host);
mmc_request_done(host->mmc, mrq);
pm_runtime_mark_last_busy(mmc_dev(host->mmc));
pm_runtime_put_autosuspend(mmc_dev(host->mmc));
}
static void tmio_mmc_done_work(struct work_struct *work)
{
struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
done);
tmio_mmc_finish_request(host);
}
/* 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
#define NO_CMD12_ISSUE 0x4000 /* TMIO_MMC_HAVE_CMD12_CTRL */
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;
u32 irq_mask = TMIO_MASK_CMD;
/* CMD12 is handled by hardware */
if (cmd->opcode == MMC_STOP_TRANSMISSION && !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;
/*
* Disable auto CMD12 at IO_RW_EXTENDED when
* multiple block transfer
*/
if ((host->pdata->flags & TMIO_MMC_HAVE_CMD12_CTRL) &&
(cmd->opcode == SD_IO_RW_EXTENDED))
c |= NO_CMD12_ISSUE;
}
if (data->flags & MMC_DATA_READ)
c |= TRANSFER_READ;
}
if (!host->native_hotplug)
irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
tmio_mmc_enable_mmc_irqs(host, irq_mask);
/* Fire off the command */
sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
sd_ctrl_write16(host, CTL_SD_CMD, c);
return 0;
}
static void tmio_mmc_transfer_data(struct tmio_mmc_host *host,
unsigned short *buf,
unsigned int count)
{
int is_read = host->data->flags & MMC_DATA_READ;
u8 *buf8;
/*
* Transfer the data
*/
if (is_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);
/* if count was even number */
if (!(count & 0x1))
return;
/* if count was odd number */
buf8 = (u8 *)(buf + (count >> 1));
/*
* FIXME
*
* driver and this function are assuming that
* it is used as little endian
*/
if (is_read)
*buf8 = sd_ctrl_read16(host, CTL_SD_DATA_PORT) & 0xff;
else
sd_ctrl_write16(host, CTL_SD_DATA_PORT, *buf8);
}
/*
* 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 doesn't 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 ((host->chan_tx || host->chan_rx) && !host->force_pio) {
pr_err("PIO IRQ in DMA mode!\n");
return;
} else 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 */
tmio_mmc_transfer_data(host, buf, count);
host->sg_off += count;
tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
if (host->sg_off == host->sg_ptr->length)
tmio_mmc_next_sg(host);
return;
}
static void tmio_mmc_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(host->sg_orig, &flags, sg_vaddr);
}
}
/* needs to be called with host->lock held */
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 && !host->force_pio)
tmio_mmc_check_bounce_buffer(host);
dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
host->mrq);
} else {
dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
host->mrq);
}
if (stop) {
if (stop->opcode == MMC_STOP_TRANSMISSION && !stop->arg)
sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000);
else
BUG();
}
schedule_work(&host->done);
}
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) && !host->force_pio) {
u32 status = sd_ctrl_read32(host, CTL_STATUS);
bool done = false;
/*
* 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 (host->pdata->flags & TMIO_MMC_HAS_IDLE_WAIT) {
if (status & TMIO_STAT_ILL_FUNC)
done = true;
} else {
if (!(status & TMIO_STAT_CMD_BUSY))
done = true;
}
if (done) {
tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
tasklet_schedule(&host->dma_complete);
}
} else if (host->chan_rx && (data->flags & MMC_DATA_READ) && !host->force_pio) {
tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
tasklet_schedule(&host->dma_complete);
} else {
tmio_mmc_do_data_irq(host);
tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
}
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->force_pio || !host->chan_rx)
tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
else
tasklet_schedule(&host->dma_issue);
} else {
if (host->force_pio || !host->chan_tx)
tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
else
tasklet_schedule(&host->dma_issue);
}
} else {
schedule_work(&host->done);
}
out:
spin_unlock(&host->lock);
}
static void tmio_mmc_card_irq_status(struct tmio_mmc_host *host,
int *ireg, int *status)
{
*status = sd_ctrl_read32(host, CTL_STATUS);
*ireg = *status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask;
pr_debug_status(*status);
pr_debug_status(*ireg);
/* Clear the status except the interrupt status */
sd_ctrl_write32(host, CTL_STATUS, TMIO_MASK_IRQ);
}
static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host,
int ireg, int status)
{
struct mmc_host *mmc = host->mmc;
/* Card insert / remove attempts */
if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
TMIO_STAT_CARD_REMOVE);
if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) ||
((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) &&
!work_pending(&mmc->detect.work))
mmc_detect_change(host->mmc, msecs_to_jiffies(100));
return true;
}
return false;
}
irqreturn_t tmio_mmc_card_detect_irq(int irq, void *devid)
{
unsigned int ireg, status;
struct tmio_mmc_host *host = devid;
tmio_mmc_card_irq_status(host, &ireg, &status);
__tmio_mmc_card_detect_irq(host, ireg, status);
return IRQ_HANDLED;
}
EXPORT_SYMBOL(tmio_mmc_card_detect_irq);
static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host,
int ireg, int status)
{
/* Command completion */
if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
tmio_mmc_ack_mmc_irqs(host,
TMIO_STAT_CMDRESPEND |
TMIO_STAT_CMDTIMEOUT);
tmio_mmc_cmd_irq(host, status);
return true;
}
/* Data transfer */
if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
tmio_mmc_pio_irq(host);
return true;
}
/* Data transfer completion */
if (ireg & TMIO_STAT_DATAEND) {
tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND);
tmio_mmc_data_irq(host);
return true;
}
return false;
}
irqreturn_t tmio_mmc_sdcard_irq(int irq, void *devid)
{
unsigned int ireg, status;
struct tmio_mmc_host *host = devid;
tmio_mmc_card_irq_status(host, &ireg, &status);
__tmio_mmc_sdcard_irq(host, ireg, status);
return IRQ_HANDLED;
}
EXPORT_SYMBOL(tmio_mmc_sdcard_irq);
irqreturn_t tmio_mmc_sdio_irq(int irq, void *devid)
{
struct tmio_mmc_host *host = devid;
struct mmc_host *mmc = host->mmc;
struct tmio_mmc_data *pdata = host->pdata;
unsigned int ireg, status;
unsigned int sdio_status;
if (!(pdata->flags & TMIO_MMC_SDIO_IRQ))
return IRQ_HANDLED;
status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdcard_irq_mask;
sdio_status = status & ~TMIO_SDIO_MASK_ALL;
if (pdata->flags & TMIO_MMC_SDIO_STATUS_QUIRK)
sdio_status |= 6;
sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status);
if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ)
mmc_signal_sdio_irq(mmc);
return IRQ_HANDLED;
}
EXPORT_SYMBOL(tmio_mmc_sdio_irq);
irqreturn_t tmio_mmc_irq(int irq, void *devid)
{
struct tmio_mmc_host *host = devid;
unsigned int ireg, status;
pr_debug("MMC IRQ begin\n");
tmio_mmc_card_irq_status(host, &ireg, &status);
if (__tmio_mmc_card_detect_irq(host, ireg, status))
return IRQ_HANDLED;
if (__tmio_mmc_sdcard_irq(host, ireg, status))
return IRQ_HANDLED;
tmio_mmc_sdio_irq(irq, devid);
return IRQ_HANDLED;
}
EXPORT_SYMBOL(tmio_mmc_irq);
static int tmio_mmc_start_data(struct tmio_mmc_host *host,
struct mmc_data *data)
{
struct tmio_mmc_data *pdata = host->pdata;
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);
unsigned long flags;
int ret;
spin_lock_irqsave(&host->lock, flags);
if (host->mrq) {
pr_debug("request not null\n");
if (IS_ERR(host->mrq)) {
spin_unlock_irqrestore(&host->lock, flags);
mrq->cmd->error = -EAGAIN;
mmc_request_done(mmc, mrq);
return;
}
}
host->last_req_ts = jiffies;
wmb();
host->mrq = mrq;
spin_unlock_irqrestore(&host->lock, flags);
pm_runtime_get_sync(mmc_dev(mmc));
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->force_pio = false;
host->mrq = NULL;
mrq->cmd->error = ret;
mmc_request_done(mmc, mrq);
pm_runtime_mark_last_busy(mmc_dev(mmc));
pm_runtime_put_autosuspend(mmc_dev(mmc));
}
static int tmio_mmc_clk_update(struct tmio_mmc_host *host)
{
struct mmc_host *mmc = host->mmc;
struct tmio_mmc_data *pdata = host->pdata;
int ret;
if (!pdata->clk_enable)
return -ENOTSUPP;
ret = pdata->clk_enable(host->pdev, &mmc->f_max);
if (!ret)
mmc->f_min = mmc->f_max / 512;
return ret;
}
static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd)
{
struct mmc_host *mmc = host->mmc;
int ret = 0;
/* .set_ios() is returning void, so, no chance to report an error */
if (host->set_pwr)
host->set_pwr(host->pdev, 1);
if (!IS_ERR(mmc->supply.vmmc)) {
ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
/*
* Attention: empiric value. With a b43 WiFi SDIO card this
* delay proved necessary for reliable card-insertion probing.
* 100us were not enough. Is this the same 140us delay, as in
* tmio_mmc_set_ios()?
*/
udelay(200);
}
/*
* It seems, VccQ should be switched on after Vcc, this is also what the
* omap_hsmmc.c driver does.
*/
if (!IS_ERR(mmc->supply.vqmmc) && !ret) {
ret = regulator_enable(mmc->supply.vqmmc);
udelay(200);
}
if (ret < 0)
dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n",
ret);
}
static void tmio_mmc_power_off(struct tmio_mmc_host *host)
{
struct mmc_host *mmc = host->mmc;
if (!IS_ERR(mmc->supply.vqmmc))
regulator_disable(mmc->supply.vqmmc);
if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
if (host->set_pwr)
host->set_pwr(host->pdev, 0);
}
static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host,
unsigned char bus_width)
{
switch (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;
}
}
/* 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);
struct device *dev = &host->pdev->dev;
unsigned long flags;
pm_runtime_get_sync(mmc_dev(mmc));
mutex_lock(&host->ios_lock);
spin_lock_irqsave(&host->lock, flags);
if (host->mrq) {
if (IS_ERR(host->mrq)) {
dev_dbg(dev,
"%s.%d: concurrent .set_ios(), clk %u, mode %u\n",
current->comm, task_pid_nr(current),
ios->clock, ios->power_mode);
host->mrq = ERR_PTR(-EINTR);
} else {
dev_dbg(dev,
"%s.%d: CMD%u active since %lu, now %lu!\n",
current->comm, task_pid_nr(current),
host->mrq->cmd->opcode, host->last_req_ts, jiffies);
}
spin_unlock_irqrestore(&host->lock, flags);
mutex_unlock(&host->ios_lock);
return;
}
host->mrq = ERR_PTR(-EBUSY);
spin_unlock_irqrestore(&host->lock, flags);
switch (ios->power_mode) {
case MMC_POWER_OFF:
tmio_mmc_power_off(host);
tmio_mmc_clk_stop(host);
break;
case MMC_POWER_UP:
tmio_mmc_set_clock(host, ios->clock);
tmio_mmc_power_on(host, ios->vdd);
tmio_mmc_clk_start(host);
tmio_mmc_set_bus_width(host, ios->bus_width);
break;
case MMC_POWER_ON:
tmio_mmc_set_clock(host, ios->clock);
tmio_mmc_clk_start(host);
tmio_mmc_set_bus_width(host, ios->bus_width);
break;
}
/* Let things settle. delay taken from winCE driver */
udelay(140);
if (PTR_ERR(host->mrq) == -EINTR)
dev_dbg(&host->pdev->dev,
"%s.%d: IOS interrupted: clk %u, mode %u",
current->comm, task_pid_nr(current),
ios->clock, ios->power_mode);
host->mrq = NULL;
host->clk_cache = ios->clock;
mutex_unlock(&host->ios_lock);
pm_runtime_mark_last_busy(mmc_dev(mmc));
pm_runtime_put_autosuspend(mmc_dev(mmc));
}
static int tmio_mmc_get_ro(struct mmc_host *mmc)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
struct tmio_mmc_data *pdata = host->pdata;
int ret = mmc_gpio_get_ro(mmc);
if (ret >= 0)
return ret;
pm_runtime_get_sync(mmc_dev(mmc));
ret = !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
pm_runtime_mark_last_busy(mmc_dev(mmc));
pm_runtime_put_autosuspend(mmc_dev(mmc));
return ret;
}
static int tmio_multi_io_quirk(struct mmc_card *card,
unsigned int direction, int blk_size)
{
struct tmio_mmc_host *host = mmc_priv(card->host);
struct tmio_mmc_data *pdata = host->pdata;
if (pdata->multi_io_quirk)
return pdata->multi_io_quirk(card, direction, blk_size);
return blk_size;
}
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 = mmc_gpio_get_cd,
.enable_sdio_irq = tmio_mmc_enable_sdio_irq,
.multi_io_quirk = tmio_multi_io_quirk,
};
static int tmio_mmc_init_ocr(struct tmio_mmc_host *host)
{
struct tmio_mmc_data *pdata = host->pdata;
struct mmc_host *mmc = host->mmc;
mmc_regulator_get_supply(mmc);
/* use ocr_mask if no regulator */
if (!mmc->ocr_avail)
mmc->ocr_avail = pdata->ocr_mask;
/*
* try again.
* There is possibility that regulator has not been probed
*/
if (!mmc->ocr_avail)
return -EPROBE_DEFER;
return 0;
}
static void tmio_mmc_of_parse(struct platform_device *pdev,
struct tmio_mmc_data *pdata)
{
const struct device_node *np = pdev->dev.of_node;
if (!np)
return;
if (of_get_property(np, "toshiba,mmc-wrprotect-disable", NULL))
pdata->flags |= TMIO_MMC_WRPROTECT_DISABLE;
}
int tmio_mmc_host_probe(struct tmio_mmc_host **host,
struct platform_device *pdev,
struct tmio_mmc_data *pdata)
{
struct tmio_mmc_host *_host;
struct mmc_host *mmc;
struct resource *res_ctl;
int ret;
u32 irq_mask = TMIO_MASK_CMD;
tmio_mmc_of_parse(pdev, pdata);
if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT))
pdata->write16_hook = NULL;
res_ctl = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res_ctl)
return -EINVAL;
mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
if (!mmc)
return -ENOMEM;
ret = mmc_of_parse(mmc);
if (ret < 0)
goto host_free;
pdata->dev = &pdev->dev;
_host = mmc_priv(mmc);
_host->pdata = pdata;
_host->mmc = mmc;
_host->pdev = pdev;
platform_set_drvdata(pdev, mmc);
_host->set_pwr = pdata->set_pwr;
_host->set_clk_div = pdata->set_clk_div;
ret = tmio_mmc_init_ocr(_host);
if (ret < 0)
goto host_free;
_host->ctl = ioremap(res_ctl->start, resource_size(res_ctl));
if (!_host->ctl) {
ret = -ENOMEM;
goto host_free;
}
mmc->ops = &tmio_mmc_ops;
mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities;
mmc->caps2 |= pdata->capabilities2;
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;
_host->native_hotplug = !(pdata->flags & TMIO_MMC_USE_GPIO_CD ||
mmc->caps & MMC_CAP_NEEDS_POLL ||
mmc->caps & MMC_CAP_NONREMOVABLE ||
mmc->slot.cd_irq >= 0);
if (tmio_mmc_clk_update(_host) < 0) {
mmc->f_max = pdata->hclk;
mmc->f_min = mmc->f_max / 512;
}
/*
* Check the sanity of mmc->f_min to prevent tmio_mmc_set_clock() from
* looping forever...
*/
if (mmc->f_min == 0) {
ret = -EINVAL;
goto host_free;
}
/*
* While using internal tmio hardware logic for card detection, we need
* to ensure it stays powered for it to work.
*/
if (_host->native_hotplug)
pm_runtime_get_noresume(&pdev->dev);
tmio_mmc_clk_stop(_host);
tmio_mmc_reset(_host);
_host->sdcard_irq_mask = sd_ctrl_read32(_host, CTL_IRQ_MASK);
tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
/* 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;
if (!_host->native_hotplug)
irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
_host->sdcard_irq_mask &= ~irq_mask;
_host->sdio_irq_enabled = false;
if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
_host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
sd_ctrl_write16(_host, CTL_SDIO_IRQ_MASK, _host->sdio_irq_mask);
sd_ctrl_write16(_host, CTL_TRANSACTION_CTL, 0x0000);
}
spin_lock_init(&_host->lock);
mutex_init(&_host->ios_lock);
/* Init delayed work for request timeouts */
INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
INIT_WORK(&_host->done, tmio_mmc_done_work);
/* See if we also get DMA */
tmio_mmc_request_dma(_host, pdata);
pm_runtime_set_active(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = mmc_add_host(mmc);
if (ret < 0) {
tmio_mmc_host_remove(_host);
return ret;
}
dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
if (pdata->flags & TMIO_MMC_USE_GPIO_CD) {
ret = mmc_gpio_request_cd(mmc, pdata->cd_gpio, 0);
if (ret < 0) {
tmio_mmc_host_remove(_host);
return ret;
}
mmc_gpiod_request_cd_irq(mmc);
}
*host = _host;
return 0;
host_free:
mmc_free_host(mmc);
return ret;
}
EXPORT_SYMBOL(tmio_mmc_host_probe);
void tmio_mmc_host_remove(struct tmio_mmc_host *host)
{
struct platform_device *pdev = host->pdev;
struct mmc_host *mmc = host->mmc;
if (!host->native_hotplug)
pm_runtime_get_sync(&pdev->dev);
dev_pm_qos_hide_latency_limit(&pdev->dev);
mmc_remove_host(mmc);
cancel_work_sync(&host->done);
cancel_delayed_work_sync(&host->delayed_reset_work);
tmio_mmc_release_dma(host);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
iounmap(host->ctl);
mmc_free_host(mmc);
}
EXPORT_SYMBOL(tmio_mmc_host_remove);
#ifdef CONFIG_PM
int tmio_mmc_host_runtime_suspend(struct device *dev)
{
struct mmc_host *mmc = dev_get_drvdata(dev);
struct tmio_mmc_host *host = mmc_priv(mmc);
tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
if (host->clk_cache)
tmio_mmc_clk_stop(host);
if (host->pdata->clk_disable)
host->pdata->clk_disable(host->pdev);
return 0;
}
EXPORT_SYMBOL(tmio_mmc_host_runtime_suspend);
int tmio_mmc_host_runtime_resume(struct device *dev)
{
struct mmc_host *mmc = dev_get_drvdata(dev);
struct tmio_mmc_host *host = mmc_priv(mmc);
tmio_mmc_reset(host);
tmio_mmc_clk_update(host);
if (host->clk_cache) {
tmio_mmc_set_clock(host, host->clk_cache);
tmio_mmc_clk_start(host);
}
tmio_mmc_enable_dma(host, true);
return 0;
}
EXPORT_SYMBOL(tmio_mmc_host_runtime_resume);
#endif
MODULE_LICENSE("GPL v2");