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linux/drivers/mmc/host/omap.c
Ulf Hansson 136b0a471c mmc: omap: Don't use mmc_card_present() when validating for inserted card 
The mmc_card_present() function helps the mmc core to track an internal
state of the card device. More importantly, it's not intended to be used by
mmc host drivers to check for an inserted card. Therefore, let's stop using
it and instead rely on checking for a valid pointer to a struct mmc_card,
as it should be good enough.

Cc: linux-omap@vger.kernel.org
Cc: Tony Lindgren <tony@atomide.com>
Cc: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
2017-02-13 13:20:23 +01:00

1514 lines
36 KiB
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/*
* linux/drivers/mmc/host/omap.c
*
* Copyright (C) 2004 Nokia Corporation
* Written by Tuukka Tikkanen and Juha Yrjölä<juha.yrjola@nokia.com>
* Misc hacks here and there by Tony Lindgren <tony@atomide.com>
* Other hacks (DMA, SD, etc) by David Brownell
*
* 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.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/of.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
#include <linux/clk.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/platform_data/mmc-omap.h>
#define OMAP_MMC_REG_CMD 0x00
#define OMAP_MMC_REG_ARGL 0x01
#define OMAP_MMC_REG_ARGH 0x02
#define OMAP_MMC_REG_CON 0x03
#define OMAP_MMC_REG_STAT 0x04
#define OMAP_MMC_REG_IE 0x05
#define OMAP_MMC_REG_CTO 0x06
#define OMAP_MMC_REG_DTO 0x07
#define OMAP_MMC_REG_DATA 0x08
#define OMAP_MMC_REG_BLEN 0x09
#define OMAP_MMC_REG_NBLK 0x0a
#define OMAP_MMC_REG_BUF 0x0b
#define OMAP_MMC_REG_SDIO 0x0d
#define OMAP_MMC_REG_REV 0x0f
#define OMAP_MMC_REG_RSP0 0x10
#define OMAP_MMC_REG_RSP1 0x11
#define OMAP_MMC_REG_RSP2 0x12
#define OMAP_MMC_REG_RSP3 0x13
#define OMAP_MMC_REG_RSP4 0x14
#define OMAP_MMC_REG_RSP5 0x15
#define OMAP_MMC_REG_RSP6 0x16
#define OMAP_MMC_REG_RSP7 0x17
#define OMAP_MMC_REG_IOSR 0x18
#define OMAP_MMC_REG_SYSC 0x19
#define OMAP_MMC_REG_SYSS 0x1a
#define OMAP_MMC_STAT_CARD_ERR (1 << 14)
#define OMAP_MMC_STAT_CARD_IRQ (1 << 13)
#define OMAP_MMC_STAT_OCR_BUSY (1 << 12)
#define OMAP_MMC_STAT_A_EMPTY (1 << 11)
#define OMAP_MMC_STAT_A_FULL (1 << 10)
#define OMAP_MMC_STAT_CMD_CRC (1 << 8)
#define OMAP_MMC_STAT_CMD_TOUT (1 << 7)
#define OMAP_MMC_STAT_DATA_CRC (1 << 6)
#define OMAP_MMC_STAT_DATA_TOUT (1 << 5)
#define OMAP_MMC_STAT_END_BUSY (1 << 4)
#define OMAP_MMC_STAT_END_OF_DATA (1 << 3)
#define OMAP_MMC_STAT_CARD_BUSY (1 << 2)
#define OMAP_MMC_STAT_END_OF_CMD (1 << 0)
#define mmc_omap7xx() (host->features & MMC_OMAP7XX)
#define mmc_omap15xx() (host->features & MMC_OMAP15XX)
#define mmc_omap16xx() (host->features & MMC_OMAP16XX)
#define MMC_OMAP1_MASK (MMC_OMAP7XX | MMC_OMAP15XX | MMC_OMAP16XX)
#define mmc_omap1() (host->features & MMC_OMAP1_MASK)
#define mmc_omap2() (!mmc_omap1())
#define OMAP_MMC_REG(host, reg) (OMAP_MMC_REG_##reg << (host)->reg_shift)
#define OMAP_MMC_READ(host, reg) __raw_readw((host)->virt_base + OMAP_MMC_REG(host, reg))
#define OMAP_MMC_WRITE(host, reg, val) __raw_writew((val), (host)->virt_base + OMAP_MMC_REG(host, reg))
/*
* Command types
*/
#define OMAP_MMC_CMDTYPE_BC 0
#define OMAP_MMC_CMDTYPE_BCR 1
#define OMAP_MMC_CMDTYPE_AC 2
#define OMAP_MMC_CMDTYPE_ADTC 3
#define DRIVER_NAME "mmci-omap"
/* Specifies how often in millisecs to poll for card status changes
* when the cover switch is open */
#define OMAP_MMC_COVER_POLL_DELAY 500
struct mmc_omap_host;
struct mmc_omap_slot {
int id;
unsigned int vdd;
u16 saved_con;
u16 bus_mode;
unsigned int fclk_freq;
struct tasklet_struct cover_tasklet;
struct timer_list cover_timer;
unsigned cover_open;
struct mmc_request *mrq;
struct mmc_omap_host *host;
struct mmc_host *mmc;
struct omap_mmc_slot_data *pdata;
};
struct mmc_omap_host {
int initialized;
struct mmc_request * mrq;
struct mmc_command * cmd;
struct mmc_data * data;
struct mmc_host * mmc;
struct device * dev;
unsigned char id; /* 16xx chips have 2 MMC blocks */
struct clk * iclk;
struct clk * fclk;
struct dma_chan *dma_rx;
u32 dma_rx_burst;
struct dma_chan *dma_tx;
u32 dma_tx_burst;
void __iomem *virt_base;
unsigned int phys_base;
int irq;
unsigned char bus_mode;
unsigned int reg_shift;
struct work_struct cmd_abort_work;
unsigned abort:1;
struct timer_list cmd_abort_timer;
struct work_struct slot_release_work;
struct mmc_omap_slot *next_slot;
struct work_struct send_stop_work;
struct mmc_data *stop_data;
unsigned int sg_len;
int sg_idx;
u16 * buffer;
u32 buffer_bytes_left;
u32 total_bytes_left;
unsigned features;
unsigned brs_received:1, dma_done:1;
unsigned dma_in_use:1;
spinlock_t dma_lock;
struct mmc_omap_slot *slots[OMAP_MMC_MAX_SLOTS];
struct mmc_omap_slot *current_slot;
spinlock_t slot_lock;
wait_queue_head_t slot_wq;
int nr_slots;
struct timer_list clk_timer;
spinlock_t clk_lock; /* for changing enabled state */
unsigned int fclk_enabled:1;
struct workqueue_struct *mmc_omap_wq;
struct omap_mmc_platform_data *pdata;
};
static void mmc_omap_fclk_offdelay(struct mmc_omap_slot *slot)
{
unsigned long tick_ns;
if (slot != NULL && slot->host->fclk_enabled && slot->fclk_freq > 0) {
tick_ns = DIV_ROUND_UP(NSEC_PER_SEC, slot->fclk_freq);
ndelay(8 * tick_ns);
}
}
static void mmc_omap_fclk_enable(struct mmc_omap_host *host, unsigned int enable)
{
unsigned long flags;
spin_lock_irqsave(&host->clk_lock, flags);
if (host->fclk_enabled != enable) {
host->fclk_enabled = enable;
if (enable)
clk_enable(host->fclk);
else
clk_disable(host->fclk);
}
spin_unlock_irqrestore(&host->clk_lock, flags);
}
static void mmc_omap_select_slot(struct mmc_omap_slot *slot, int claimed)
{
struct mmc_omap_host *host = slot->host;
unsigned long flags;
if (claimed)
goto no_claim;
spin_lock_irqsave(&host->slot_lock, flags);
while (host->mmc != NULL) {
spin_unlock_irqrestore(&host->slot_lock, flags);
wait_event(host->slot_wq, host->mmc == NULL);
spin_lock_irqsave(&host->slot_lock, flags);
}
host->mmc = slot->mmc;
spin_unlock_irqrestore(&host->slot_lock, flags);
no_claim:
del_timer(&host->clk_timer);
if (host->current_slot != slot || !claimed)
mmc_omap_fclk_offdelay(host->current_slot);
if (host->current_slot != slot) {
OMAP_MMC_WRITE(host, CON, slot->saved_con & 0xFC00);
if (host->pdata->switch_slot != NULL)
host->pdata->switch_slot(mmc_dev(slot->mmc), slot->id);
host->current_slot = slot;
}
if (claimed) {
mmc_omap_fclk_enable(host, 1);
/* Doing the dummy read here seems to work around some bug
* at least in OMAP24xx silicon where the command would not
* start after writing the CMD register. Sigh. */
OMAP_MMC_READ(host, CON);
OMAP_MMC_WRITE(host, CON, slot->saved_con);
} else
mmc_omap_fclk_enable(host, 0);
}
static void mmc_omap_start_request(struct mmc_omap_host *host,
struct mmc_request *req);
static void mmc_omap_slot_release_work(struct work_struct *work)
{
struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
slot_release_work);
struct mmc_omap_slot *next_slot = host->next_slot;
struct mmc_request *rq;
host->next_slot = NULL;
mmc_omap_select_slot(next_slot, 1);
rq = next_slot->mrq;
next_slot->mrq = NULL;
mmc_omap_start_request(host, rq);
}
static void mmc_omap_release_slot(struct mmc_omap_slot *slot, int clk_enabled)
{
struct mmc_omap_host *host = slot->host;
unsigned long flags;
int i;
BUG_ON(slot == NULL || host->mmc == NULL);
if (clk_enabled)
/* Keeps clock running for at least 8 cycles on valid freq */
mod_timer(&host->clk_timer, jiffies + HZ/10);
else {
del_timer(&host->clk_timer);
mmc_omap_fclk_offdelay(slot);
mmc_omap_fclk_enable(host, 0);
}
spin_lock_irqsave(&host->slot_lock, flags);
/* Check for any pending requests */
for (i = 0; i < host->nr_slots; i++) {
struct mmc_omap_slot *new_slot;
if (host->slots[i] == NULL || host->slots[i]->mrq == NULL)
continue;
BUG_ON(host->next_slot != NULL);
new_slot = host->slots[i];
/* The current slot should not have a request in queue */
BUG_ON(new_slot == host->current_slot);
host->next_slot = new_slot;
host->mmc = new_slot->mmc;
spin_unlock_irqrestore(&host->slot_lock, flags);
queue_work(host->mmc_omap_wq, &host->slot_release_work);
return;
}
host->mmc = NULL;
wake_up(&host->slot_wq);
spin_unlock_irqrestore(&host->slot_lock, flags);
}
static inline
int mmc_omap_cover_is_open(struct mmc_omap_slot *slot)
{
if (slot->pdata->get_cover_state)
return slot->pdata->get_cover_state(mmc_dev(slot->mmc),
slot->id);
return 0;
}
static ssize_t
mmc_omap_show_cover_switch(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
struct mmc_omap_slot *slot = mmc_priv(mmc);
return sprintf(buf, "%s\n", mmc_omap_cover_is_open(slot) ? "open" :
"closed");
}
static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
static ssize_t
mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
struct mmc_omap_slot *slot = mmc_priv(mmc);
return sprintf(buf, "%s\n", slot->pdata->name);
}
static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL);
static void
mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
{
u32 cmdreg;
u32 resptype;
u32 cmdtype;
u16 irq_mask;
host->cmd = cmd;
resptype = 0;
cmdtype = 0;
/* Our hardware needs to know exact type */
switch (mmc_resp_type(cmd)) {
case MMC_RSP_NONE:
break;
case MMC_RSP_R1:
case MMC_RSP_R1B:
/* resp 1, 1b, 6, 7 */
resptype = 1;
break;
case MMC_RSP_R2:
resptype = 2;
break;
case MMC_RSP_R3:
resptype = 3;
break;
default:
dev_err(mmc_dev(host->mmc), "Invalid response type: %04x\n", mmc_resp_type(cmd));
break;
}
if (mmc_cmd_type(cmd) == MMC_CMD_ADTC) {
cmdtype = OMAP_MMC_CMDTYPE_ADTC;
} else if (mmc_cmd_type(cmd) == MMC_CMD_BC) {
cmdtype = OMAP_MMC_CMDTYPE_BC;
} else if (mmc_cmd_type(cmd) == MMC_CMD_BCR) {
cmdtype = OMAP_MMC_CMDTYPE_BCR;
} else {
cmdtype = OMAP_MMC_CMDTYPE_AC;
}
cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
if (host->current_slot->bus_mode == MMC_BUSMODE_OPENDRAIN)
cmdreg |= 1 << 6;
if (cmd->flags & MMC_RSP_BUSY)
cmdreg |= 1 << 11;
if (host->data && !(host->data->flags & MMC_DATA_WRITE))
cmdreg |= 1 << 15;
mod_timer(&host->cmd_abort_timer, jiffies + HZ/2);
OMAP_MMC_WRITE(host, CTO, 200);
OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff);
OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16);
irq_mask = OMAP_MMC_STAT_A_EMPTY | OMAP_MMC_STAT_A_FULL |
OMAP_MMC_STAT_CMD_CRC | OMAP_MMC_STAT_CMD_TOUT |
OMAP_MMC_STAT_DATA_CRC | OMAP_MMC_STAT_DATA_TOUT |
OMAP_MMC_STAT_END_OF_CMD | OMAP_MMC_STAT_CARD_ERR |
OMAP_MMC_STAT_END_OF_DATA;
if (cmd->opcode == MMC_ERASE)
irq_mask &= ~OMAP_MMC_STAT_DATA_TOUT;
OMAP_MMC_WRITE(host, IE, irq_mask);
OMAP_MMC_WRITE(host, CMD, cmdreg);
}
static void
mmc_omap_release_dma(struct mmc_omap_host *host, struct mmc_data *data,
int abort)
{
enum dma_data_direction dma_data_dir;
struct device *dev = mmc_dev(host->mmc);
struct dma_chan *c;
if (data->flags & MMC_DATA_WRITE) {
dma_data_dir = DMA_TO_DEVICE;
c = host->dma_tx;
} else {
dma_data_dir = DMA_FROM_DEVICE;
c = host->dma_rx;
}
if (c) {
if (data->error) {
dmaengine_terminate_all(c);
/* Claim nothing transferred on error... */
data->bytes_xfered = 0;
}
dev = c->device->dev;
}
dma_unmap_sg(dev, data->sg, host->sg_len, dma_data_dir);
}
static void mmc_omap_send_stop_work(struct work_struct *work)
{
struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
send_stop_work);
struct mmc_omap_slot *slot = host->current_slot;
struct mmc_data *data = host->stop_data;
unsigned long tick_ns;
tick_ns = DIV_ROUND_UP(NSEC_PER_SEC, slot->fclk_freq);
ndelay(8*tick_ns);
mmc_omap_start_command(host, data->stop);
}
static void
mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
{
if (host->dma_in_use)
mmc_omap_release_dma(host, data, data->error);
host->data = NULL;
host->sg_len = 0;
/* NOTE: MMC layer will sometimes poll-wait CMD13 next, issuing
* dozens of requests until the card finishes writing data.
* It'd be cheaper to just wait till an EOFB interrupt arrives...
*/
if (!data->stop) {
struct mmc_host *mmc;
host->mrq = NULL;
mmc = host->mmc;
mmc_omap_release_slot(host->current_slot, 1);
mmc_request_done(mmc, data->mrq);
return;
}
host->stop_data = data;
queue_work(host->mmc_omap_wq, &host->send_stop_work);
}
static void
mmc_omap_send_abort(struct mmc_omap_host *host, int maxloops)
{
struct mmc_omap_slot *slot = host->current_slot;
unsigned int restarts, passes, timeout;
u16 stat = 0;
/* Sending abort takes 80 clocks. Have some extra and round up */
timeout = DIV_ROUND_UP(120 * USEC_PER_SEC, slot->fclk_freq);
restarts = 0;
while (restarts < maxloops) {
OMAP_MMC_WRITE(host, STAT, 0xFFFF);
OMAP_MMC_WRITE(host, CMD, (3 << 12) | (1 << 7));
passes = 0;
while (passes < timeout) {
stat = OMAP_MMC_READ(host, STAT);
if (stat & OMAP_MMC_STAT_END_OF_CMD)
goto out;
udelay(1);
passes++;
}
restarts++;
}
out:
OMAP_MMC_WRITE(host, STAT, stat);
}
static void
mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data)
{
if (host->dma_in_use)
mmc_omap_release_dma(host, data, 1);
host->data = NULL;
host->sg_len = 0;
mmc_omap_send_abort(host, 10000);
}
static void
mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data)
{
unsigned long flags;
int done;
if (!host->dma_in_use) {
mmc_omap_xfer_done(host, data);
return;
}
done = 0;
spin_lock_irqsave(&host->dma_lock, flags);
if (host->dma_done)
done = 1;
else
host->brs_received = 1;
spin_unlock_irqrestore(&host->dma_lock, flags);
if (done)
mmc_omap_xfer_done(host, data);
}
static void
mmc_omap_dma_done(struct mmc_omap_host *host, struct mmc_data *data)
{
unsigned long flags;
int done;
done = 0;
spin_lock_irqsave(&host->dma_lock, flags);
if (host->brs_received)
done = 1;
else
host->dma_done = 1;
spin_unlock_irqrestore(&host->dma_lock, flags);
if (done)
mmc_omap_xfer_done(host, data);
}
static void
mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
{
host->cmd = NULL;
del_timer(&host->cmd_abort_timer);
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136) {
/* response type 2 */
cmd->resp[3] =
OMAP_MMC_READ(host, RSP0) |
(OMAP_MMC_READ(host, RSP1) << 16);
cmd->resp[2] =
OMAP_MMC_READ(host, RSP2) |
(OMAP_MMC_READ(host, RSP3) << 16);
cmd->resp[1] =
OMAP_MMC_READ(host, RSP4) |
(OMAP_MMC_READ(host, RSP5) << 16);
cmd->resp[0] =
OMAP_MMC_READ(host, RSP6) |
(OMAP_MMC_READ(host, RSP7) << 16);
} else {
/* response types 1, 1b, 3, 4, 5, 6 */
cmd->resp[0] =
OMAP_MMC_READ(host, RSP6) |
(OMAP_MMC_READ(host, RSP7) << 16);
}
}
if (host->data == NULL || cmd->error) {
struct mmc_host *mmc;
if (host->data != NULL)
mmc_omap_abort_xfer(host, host->data);
host->mrq = NULL;
mmc = host->mmc;
mmc_omap_release_slot(host->current_slot, 1);
mmc_request_done(mmc, cmd->mrq);
}
}
/*
* Abort stuck command. Can occur when card is removed while it is being
* read.
*/
static void mmc_omap_abort_command(struct work_struct *work)
{
struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
cmd_abort_work);
BUG_ON(!host->cmd);
dev_dbg(mmc_dev(host->mmc), "Aborting stuck command CMD%d\n",
host->cmd->opcode);
if (host->cmd->error == 0)
host->cmd->error = -ETIMEDOUT;
if (host->data == NULL) {
struct mmc_command *cmd;
struct mmc_host *mmc;
cmd = host->cmd;
host->cmd = NULL;
mmc_omap_send_abort(host, 10000);
host->mrq = NULL;
mmc = host->mmc;
mmc_omap_release_slot(host->current_slot, 1);
mmc_request_done(mmc, cmd->mrq);
} else
mmc_omap_cmd_done(host, host->cmd);
host->abort = 0;
enable_irq(host->irq);
}
static void
mmc_omap_cmd_timer(unsigned long data)
{
struct mmc_omap_host *host = (struct mmc_omap_host *) data;
unsigned long flags;
spin_lock_irqsave(&host->slot_lock, flags);
if (host->cmd != NULL && !host->abort) {
OMAP_MMC_WRITE(host, IE, 0);
disable_irq(host->irq);
host->abort = 1;
queue_work(host->mmc_omap_wq, &host->cmd_abort_work);
}
spin_unlock_irqrestore(&host->slot_lock, flags);
}
/* PIO only */
static void
mmc_omap_sg_to_buf(struct mmc_omap_host *host)
{
struct scatterlist *sg;
sg = host->data->sg + host->sg_idx;
host->buffer_bytes_left = sg->length;
host->buffer = sg_virt(sg);
if (host->buffer_bytes_left > host->total_bytes_left)
host->buffer_bytes_left = host->total_bytes_left;
}
static void
mmc_omap_clk_timer(unsigned long data)
{
struct mmc_omap_host *host = (struct mmc_omap_host *) data;
mmc_omap_fclk_enable(host, 0);
}
/* PIO only */
static void
mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
{
int n, nwords;
if (host->buffer_bytes_left == 0) {
host->sg_idx++;
BUG_ON(host->sg_idx == host->sg_len);
mmc_omap_sg_to_buf(host);
}
n = 64;
if (n > host->buffer_bytes_left)
n = host->buffer_bytes_left;
/* Round up to handle odd number of bytes to transfer */
nwords = DIV_ROUND_UP(n, 2);
host->buffer_bytes_left -= n;
host->total_bytes_left -= n;
host->data->bytes_xfered += n;
if (write) {
__raw_writesw(host->virt_base + OMAP_MMC_REG(host, DATA),
host->buffer, nwords);
} else {
__raw_readsw(host->virt_base + OMAP_MMC_REG(host, DATA),
host->buffer, nwords);
}
host->buffer += nwords;
}
#ifdef CONFIG_MMC_DEBUG
static void mmc_omap_report_irq(struct mmc_omap_host *host, u16 status)
{
static const char *mmc_omap_status_bits[] = {
"EOC", "CD", "CB", "BRS", "EOFB", "DTO", "DCRC", "CTO",
"CCRC", "CRW", "AF", "AE", "OCRB", "CIRQ", "CERR"
};
int i;
char res[64], *buf = res;
buf += sprintf(buf, "MMC IRQ 0x%x:", status);
for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
if (status & (1 << i))
buf += sprintf(buf, " %s", mmc_omap_status_bits[i]);
dev_vdbg(mmc_dev(host->mmc), "%s\n", res);
}
#else
static void mmc_omap_report_irq(struct mmc_omap_host *host, u16 status)
{
}
#endif
static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
{
struct mmc_omap_host * host = (struct mmc_omap_host *)dev_id;
u16 status;
int end_command;
int end_transfer;
int transfer_error, cmd_error;
if (host->cmd == NULL && host->data == NULL) {
status = OMAP_MMC_READ(host, STAT);
dev_info(mmc_dev(host->slots[0]->mmc),
"Spurious IRQ 0x%04x\n", status);
if (status != 0) {
OMAP_MMC_WRITE(host, STAT, status);
OMAP_MMC_WRITE(host, IE, 0);
}
return IRQ_HANDLED;
}
end_command = 0;
end_transfer = 0;
transfer_error = 0;
cmd_error = 0;
while ((status = OMAP_MMC_READ(host, STAT)) != 0) {
int cmd;
OMAP_MMC_WRITE(host, STAT, status);
if (host->cmd != NULL)
cmd = host->cmd->opcode;
else
cmd = -1;
dev_dbg(mmc_dev(host->mmc), "MMC IRQ %04x (CMD %d): ",
status, cmd);
mmc_omap_report_irq(host, status);
if (host->total_bytes_left) {
if ((status & OMAP_MMC_STAT_A_FULL) ||
(status & OMAP_MMC_STAT_END_OF_DATA))
mmc_omap_xfer_data(host, 0);
if (status & OMAP_MMC_STAT_A_EMPTY)
mmc_omap_xfer_data(host, 1);
}
if (status & OMAP_MMC_STAT_END_OF_DATA)
end_transfer = 1;
if (status & OMAP_MMC_STAT_DATA_TOUT) {
dev_dbg(mmc_dev(host->mmc), "data timeout (CMD%d)\n",
cmd);
if (host->data) {
host->data->error = -ETIMEDOUT;
transfer_error = 1;
}
}
if (status & OMAP_MMC_STAT_DATA_CRC) {
if (host->data) {
host->data->error = -EILSEQ;
dev_dbg(mmc_dev(host->mmc),
"data CRC error, bytes left %d\n",
host->total_bytes_left);
transfer_error = 1;
} else {
dev_dbg(mmc_dev(host->mmc), "data CRC error\n");
}
}
if (status & OMAP_MMC_STAT_CMD_TOUT) {
/* Timeouts are routine with some commands */
if (host->cmd) {
struct mmc_omap_slot *slot =
host->current_slot;
if (slot == NULL ||
!mmc_omap_cover_is_open(slot))
dev_err(mmc_dev(host->mmc),
"command timeout (CMD%d)\n",
cmd);
host->cmd->error = -ETIMEDOUT;
end_command = 1;
cmd_error = 1;
}
}
if (status & OMAP_MMC_STAT_CMD_CRC) {
if (host->cmd) {
dev_err(mmc_dev(host->mmc),
"command CRC error (CMD%d, arg 0x%08x)\n",
cmd, host->cmd->arg);
host->cmd->error = -EILSEQ;
end_command = 1;
cmd_error = 1;
} else
dev_err(mmc_dev(host->mmc),
"command CRC error without cmd?\n");
}
if (status & OMAP_MMC_STAT_CARD_ERR) {
dev_dbg(mmc_dev(host->mmc),
"ignoring card status error (CMD%d)\n",
cmd);
end_command = 1;
}
/*
* NOTE: On 1610 the END_OF_CMD may come too early when
* starting a write
*/
if ((status & OMAP_MMC_STAT_END_OF_CMD) &&
(!(status & OMAP_MMC_STAT_A_EMPTY))) {
end_command = 1;
}
}
if (cmd_error && host->data) {
del_timer(&host->cmd_abort_timer);
host->abort = 1;
OMAP_MMC_WRITE(host, IE, 0);
disable_irq_nosync(host->irq);
queue_work(host->mmc_omap_wq, &host->cmd_abort_work);
return IRQ_HANDLED;
}
if (end_command && host->cmd)
mmc_omap_cmd_done(host, host->cmd);
if (host->data != NULL) {
if (transfer_error)
mmc_omap_xfer_done(host, host->data);
else if (end_transfer)
mmc_omap_end_of_data(host, host->data);
}
return IRQ_HANDLED;
}
void omap_mmc_notify_cover_event(struct device *dev, int num, int is_closed)
{
int cover_open;
struct mmc_omap_host *host = dev_get_drvdata(dev);
struct mmc_omap_slot *slot = host->slots[num];
BUG_ON(num >= host->nr_slots);
/* Other subsystems can call in here before we're initialised. */
if (host->nr_slots == 0 || !host->slots[num])
return;
cover_open = mmc_omap_cover_is_open(slot);
if (cover_open != slot->cover_open) {
slot->cover_open = cover_open;
sysfs_notify(&slot->mmc->class_dev.kobj, NULL, "cover_switch");
}
tasklet_hi_schedule(&slot->cover_tasklet);
}
static void mmc_omap_cover_timer(unsigned long arg)
{
struct mmc_omap_slot *slot = (struct mmc_omap_slot *) arg;
tasklet_schedule(&slot->cover_tasklet);
}
static void mmc_omap_cover_handler(unsigned long param)
{
struct mmc_omap_slot *slot = (struct mmc_omap_slot *)param;
int cover_open = mmc_omap_cover_is_open(slot);
mmc_detect_change(slot->mmc, 0);
if (!cover_open)
return;
/*
* If no card is inserted, we postpone polling until
* the cover has been closed.
*/
if (slot->mmc->card == NULL)
return;
mod_timer(&slot->cover_timer,
jiffies + msecs_to_jiffies(OMAP_MMC_COVER_POLL_DELAY));
}
static void mmc_omap_dma_callback(void *priv)
{
struct mmc_omap_host *host = priv;
struct mmc_data *data = host->data;
/* If we got to the end of DMA, assume everything went well */
data->bytes_xfered += data->blocks * data->blksz;
mmc_omap_dma_done(host, data);
}
static inline void set_cmd_timeout(struct mmc_omap_host *host, struct mmc_request *req)
{
u16 reg;
reg = OMAP_MMC_READ(host, SDIO);
reg &= ~(1 << 5);
OMAP_MMC_WRITE(host, SDIO, reg);
/* Set maximum timeout */
OMAP_MMC_WRITE(host, CTO, 0xff);
}
static inline void set_data_timeout(struct mmc_omap_host *host, struct mmc_request *req)
{
unsigned int timeout, cycle_ns;
u16 reg;
cycle_ns = 1000000000 / host->current_slot->fclk_freq;
timeout = req->data->timeout_ns / cycle_ns;
timeout += req->data->timeout_clks;
/* Check if we need to use timeout multiplier register */
reg = OMAP_MMC_READ(host, SDIO);
if (timeout > 0xffff) {
reg |= (1 << 5);
timeout /= 1024;
} else
reg &= ~(1 << 5);
OMAP_MMC_WRITE(host, SDIO, reg);
OMAP_MMC_WRITE(host, DTO, timeout);
}
static void
mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
{
struct mmc_data *data = req->data;
int i, use_dma = 1, block_size;
struct scatterlist *sg;
unsigned sg_len;
host->data = data;
if (data == NULL) {
OMAP_MMC_WRITE(host, BLEN, 0);
OMAP_MMC_WRITE(host, NBLK, 0);
OMAP_MMC_WRITE(host, BUF, 0);
host->dma_in_use = 0;
set_cmd_timeout(host, req);
return;
}
block_size = data->blksz;
OMAP_MMC_WRITE(host, NBLK, data->blocks - 1);
OMAP_MMC_WRITE(host, BLEN, block_size - 1);
set_data_timeout(host, req);
/* cope with calling layer confusion; it issues "single
* block" writes using multi-block scatterlists.
*/
sg_len = (data->blocks == 1) ? 1 : data->sg_len;
/* Only do DMA for entire blocks */
for_each_sg(data->sg, sg, sg_len, i) {
if ((sg->length % block_size) != 0) {
use_dma = 0;
break;
}
}
host->sg_idx = 0;
if (use_dma) {
enum dma_data_direction dma_data_dir;
struct dma_async_tx_descriptor *tx;
struct dma_chan *c;
u32 burst, *bp;
u16 buf;
/*
* FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx
* and 24xx. Use 16 or 32 word frames when the
* blocksize is at least that large. Blocksize is
* usually 512 bytes; but not for some SD reads.
*/
burst = mmc_omap15xx() ? 32 : 64;
if (burst > data->blksz)
burst = data->blksz;
burst >>= 1;
if (data->flags & MMC_DATA_WRITE) {
c = host->dma_tx;
bp = &host->dma_tx_burst;
buf = 0x0f80 | (burst - 1) << 0;
dma_data_dir = DMA_TO_DEVICE;
} else {
c = host->dma_rx;
bp = &host->dma_rx_burst;
buf = 0x800f | (burst - 1) << 8;
dma_data_dir = DMA_FROM_DEVICE;
}
if (!c)
goto use_pio;
/* Only reconfigure if we have a different burst size */
if (*bp != burst) {
struct dma_slave_config cfg = {
.src_addr = host->phys_base +
OMAP_MMC_REG(host, DATA),
.dst_addr = host->phys_base +
OMAP_MMC_REG(host, DATA),
.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES,
.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES,
.src_maxburst = burst,
.dst_maxburst = burst,
};
if (dmaengine_slave_config(c, &cfg))
goto use_pio;
*bp = burst;
}
host->sg_len = dma_map_sg(c->device->dev, data->sg, sg_len,
dma_data_dir);
if (host->sg_len == 0)
goto use_pio;
tx = dmaengine_prep_slave_sg(c, data->sg, host->sg_len,
data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!tx)
goto use_pio;
OMAP_MMC_WRITE(host, BUF, buf);
tx->callback = mmc_omap_dma_callback;
tx->callback_param = host;
dmaengine_submit(tx);
host->brs_received = 0;
host->dma_done = 0;
host->dma_in_use = 1;
return;
}
use_pio:
/* Revert to PIO? */
OMAP_MMC_WRITE(host, BUF, 0x1f1f);
host->total_bytes_left = data->blocks * block_size;
host->sg_len = sg_len;
mmc_omap_sg_to_buf(host);
host->dma_in_use = 0;
}
static void mmc_omap_start_request(struct mmc_omap_host *host,
struct mmc_request *req)
{
BUG_ON(host->mrq != NULL);
host->mrq = req;
/* only touch fifo AFTER the controller readies it */
mmc_omap_prepare_data(host, req);
mmc_omap_start_command(host, req->cmd);
if (host->dma_in_use) {
struct dma_chan *c = host->data->flags & MMC_DATA_WRITE ?
host->dma_tx : host->dma_rx;
dma_async_issue_pending(c);
}
}
static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
{
struct mmc_omap_slot *slot = mmc_priv(mmc);
struct mmc_omap_host *host = slot->host;
unsigned long flags;
spin_lock_irqsave(&host->slot_lock, flags);
if (host->mmc != NULL) {
BUG_ON(slot->mrq != NULL);
slot->mrq = req;
spin_unlock_irqrestore(&host->slot_lock, flags);
return;
} else
host->mmc = mmc;
spin_unlock_irqrestore(&host->slot_lock, flags);
mmc_omap_select_slot(slot, 1);
mmc_omap_start_request(host, req);
}
static void mmc_omap_set_power(struct mmc_omap_slot *slot, int power_on,
int vdd)
{
struct mmc_omap_host *host;
host = slot->host;
if (slot->pdata->set_power != NULL)
slot->pdata->set_power(mmc_dev(slot->mmc), slot->id, power_on,
vdd);
if (mmc_omap2()) {
u16 w;
if (power_on) {
w = OMAP_MMC_READ(host, CON);
OMAP_MMC_WRITE(host, CON, w | (1 << 11));
} else {
w = OMAP_MMC_READ(host, CON);
OMAP_MMC_WRITE(host, CON, w & ~(1 << 11));
}
}
}
static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct mmc_omap_slot *slot = mmc_priv(mmc);
struct mmc_omap_host *host = slot->host;
int func_clk_rate = clk_get_rate(host->fclk);
int dsor;
if (ios->clock == 0)
return 0;
dsor = func_clk_rate / ios->clock;
if (dsor < 1)
dsor = 1;
if (func_clk_rate / dsor > ios->clock)
dsor++;
if (dsor > 250)
dsor = 250;
slot->fclk_freq = func_clk_rate / dsor;
if (ios->bus_width == MMC_BUS_WIDTH_4)
dsor |= 1 << 15;
return dsor;
}
static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct mmc_omap_slot *slot = mmc_priv(mmc);
struct mmc_omap_host *host = slot->host;
int i, dsor;
int clk_enabled;
mmc_omap_select_slot(slot, 0);
dsor = mmc_omap_calc_divisor(mmc, ios);
if (ios->vdd != slot->vdd)
slot->vdd = ios->vdd;
clk_enabled = 0;
switch (ios->power_mode) {
case MMC_POWER_OFF:
mmc_omap_set_power(slot, 0, ios->vdd);
break;
case MMC_POWER_UP:
/* Cannot touch dsor yet, just power up MMC */
mmc_omap_set_power(slot, 1, ios->vdd);
goto exit;
case MMC_POWER_ON:
mmc_omap_fclk_enable(host, 1);
clk_enabled = 1;
dsor |= 1 << 11;
break;
}
if (slot->bus_mode != ios->bus_mode) {
if (slot->pdata->set_bus_mode != NULL)
slot->pdata->set_bus_mode(mmc_dev(mmc), slot->id,
ios->bus_mode);
slot->bus_mode = ios->bus_mode;
}
/* On insanely high arm_per frequencies something sometimes
* goes somehow out of sync, and the POW bit is not being set,
* which results in the while loop below getting stuck.
* Writing to the CON register twice seems to do the trick. */
for (i = 0; i < 2; i++)
OMAP_MMC_WRITE(host, CON, dsor);
slot->saved_con = dsor;
if (ios->power_mode == MMC_POWER_ON) {
/* worst case at 400kHz, 80 cycles makes 200 microsecs */
int usecs = 250;
/* Send clock cycles, poll completion */
OMAP_MMC_WRITE(host, IE, 0);
OMAP_MMC_WRITE(host, STAT, 0xffff);
OMAP_MMC_WRITE(host, CMD, 1 << 7);
while (usecs > 0 && (OMAP_MMC_READ(host, STAT) & 1) == 0) {
udelay(1);
usecs--;
}
OMAP_MMC_WRITE(host, STAT, 1);
}
exit:
mmc_omap_release_slot(slot, clk_enabled);
}
static const struct mmc_host_ops mmc_omap_ops = {
.request = mmc_omap_request,
.set_ios = mmc_omap_set_ios,
};
static int mmc_omap_new_slot(struct mmc_omap_host *host, int id)
{
struct mmc_omap_slot *slot = NULL;
struct mmc_host *mmc;
int r;
mmc = mmc_alloc_host(sizeof(struct mmc_omap_slot), host->dev);
if (mmc == NULL)
return -ENOMEM;
slot = mmc_priv(mmc);
slot->host = host;
slot->mmc = mmc;
slot->id = id;
slot->pdata = &host->pdata->slots[id];
host->slots[id] = slot;
mmc->caps = 0;
if (host->pdata->slots[id].wires >= 4)
mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_ERASE;
mmc->ops = &mmc_omap_ops;
mmc->f_min = 400000;
if (mmc_omap2())
mmc->f_max = 48000000;
else
mmc->f_max = 24000000;
if (host->pdata->max_freq)
mmc->f_max = min(host->pdata->max_freq, mmc->f_max);
mmc->ocr_avail = slot->pdata->ocr_mask;
/* Use scatterlist DMA to reduce per-transfer costs.
* NOTE max_seg_size assumption that small blocks aren't
* normally used (except e.g. for reading SD registers).
*/
mmc->max_segs = 32;
mmc->max_blk_size = 2048; /* BLEN is 11 bits (+1) */
mmc->max_blk_count = 2048; /* NBLK is 11 bits (+1) */
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
mmc->max_seg_size = mmc->max_req_size;
if (slot->pdata->get_cover_state != NULL) {
setup_timer(&slot->cover_timer, mmc_omap_cover_timer,
(unsigned long)slot);
tasklet_init(&slot->cover_tasklet, mmc_omap_cover_handler,
(unsigned long)slot);
}
r = mmc_add_host(mmc);
if (r < 0)
goto err_remove_host;
if (slot->pdata->name != NULL) {
r = device_create_file(&mmc->class_dev,
&dev_attr_slot_name);
if (r < 0)
goto err_remove_host;
}
if (slot->pdata->get_cover_state != NULL) {
r = device_create_file(&mmc->class_dev,
&dev_attr_cover_switch);
if (r < 0)
goto err_remove_slot_name;
tasklet_schedule(&slot->cover_tasklet);
}
return 0;
err_remove_slot_name:
if (slot->pdata->name != NULL)
device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
err_remove_host:
mmc_remove_host(mmc);
mmc_free_host(mmc);
return r;
}
static void mmc_omap_remove_slot(struct mmc_omap_slot *slot)
{
struct mmc_host *mmc = slot->mmc;
if (slot->pdata->name != NULL)
device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
if (slot->pdata->get_cover_state != NULL)
device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
tasklet_kill(&slot->cover_tasklet);
del_timer_sync(&slot->cover_timer);
flush_workqueue(slot->host->mmc_omap_wq);
mmc_remove_host(mmc);
mmc_free_host(mmc);
}
static int mmc_omap_probe(struct platform_device *pdev)
{
struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
struct mmc_omap_host *host = NULL;
struct resource *res;
int i, ret = 0;
int irq;
if (pdata == NULL) {
dev_err(&pdev->dev, "platform data missing\n");
return -ENXIO;
}
if (pdata->nr_slots == 0) {
dev_err(&pdev->dev, "no slots\n");
return -EPROBE_DEFER;
}
host = devm_kzalloc(&pdev->dev, sizeof(struct mmc_omap_host),
GFP_KERNEL);
if (host == NULL)
return -ENOMEM;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return -ENXIO;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
host->virt_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(host->virt_base))
return PTR_ERR(host->virt_base);
INIT_WORK(&host->slot_release_work, mmc_omap_slot_release_work);
INIT_WORK(&host->send_stop_work, mmc_omap_send_stop_work);
INIT_WORK(&host->cmd_abort_work, mmc_omap_abort_command);
setup_timer(&host->cmd_abort_timer, mmc_omap_cmd_timer,
(unsigned long) host);
spin_lock_init(&host->clk_lock);
setup_timer(&host->clk_timer, mmc_omap_clk_timer, (unsigned long) host);
spin_lock_init(&host->dma_lock);
spin_lock_init(&host->slot_lock);
init_waitqueue_head(&host->slot_wq);
host->pdata = pdata;
host->features = host->pdata->slots[0].features;
host->dev = &pdev->dev;
platform_set_drvdata(pdev, host);
host->id = pdev->id;
host->irq = irq;
host->phys_base = res->start;
host->iclk = clk_get(&pdev->dev, "ick");
if (IS_ERR(host->iclk))
return PTR_ERR(host->iclk);
clk_enable(host->iclk);
host->fclk = clk_get(&pdev->dev, "fck");
if (IS_ERR(host->fclk)) {
ret = PTR_ERR(host->fclk);
goto err_free_iclk;
}
host->dma_tx_burst = -1;
host->dma_rx_burst = -1;
host->dma_tx = dma_request_chan(&pdev->dev, "tx");
if (IS_ERR(host->dma_tx)) {
ret = PTR_ERR(host->dma_tx);
if (ret == -EPROBE_DEFER) {
clk_put(host->fclk);
goto err_free_iclk;
}
host->dma_tx = NULL;
dev_warn(host->dev, "TX DMA channel request failed\n");
}
host->dma_rx = dma_request_chan(&pdev->dev, "rx");
if (IS_ERR(host->dma_rx)) {
ret = PTR_ERR(host->dma_rx);
if (ret == -EPROBE_DEFER) {
if (host->dma_tx)
dma_release_channel(host->dma_tx);
clk_put(host->fclk);
goto err_free_iclk;
}
host->dma_rx = NULL;
dev_warn(host->dev, "RX DMA channel request failed\n");
}
ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
if (ret)
goto err_free_dma;
if (pdata->init != NULL) {
ret = pdata->init(&pdev->dev);
if (ret < 0)
goto err_free_irq;
}
host->nr_slots = pdata->nr_slots;
host->reg_shift = (mmc_omap7xx() ? 1 : 2);
host->mmc_omap_wq = alloc_workqueue("mmc_omap", 0, 0);
if (!host->mmc_omap_wq) {
ret = -ENOMEM;
goto err_plat_cleanup;
}
for (i = 0; i < pdata->nr_slots; i++) {
ret = mmc_omap_new_slot(host, i);
if (ret < 0) {
while (--i >= 0)
mmc_omap_remove_slot(host->slots[i]);
goto err_destroy_wq;
}
}
return 0;
err_destroy_wq:
destroy_workqueue(host->mmc_omap_wq);
err_plat_cleanup:
if (pdata->cleanup)
pdata->cleanup(&pdev->dev);
err_free_irq:
free_irq(host->irq, host);
err_free_dma:
if (host->dma_tx)
dma_release_channel(host->dma_tx);
if (host->dma_rx)
dma_release_channel(host->dma_rx);
clk_put(host->fclk);
err_free_iclk:
clk_disable(host->iclk);
clk_put(host->iclk);
return ret;
}
static int mmc_omap_remove(struct platform_device *pdev)
{
struct mmc_omap_host *host = platform_get_drvdata(pdev);
int i;
BUG_ON(host == NULL);
for (i = 0; i < host->nr_slots; i++)
mmc_omap_remove_slot(host->slots[i]);
if (host->pdata->cleanup)
host->pdata->cleanup(&pdev->dev);
mmc_omap_fclk_enable(host, 0);
free_irq(host->irq, host);
clk_put(host->fclk);
clk_disable(host->iclk);
clk_put(host->iclk);
if (host->dma_tx)
dma_release_channel(host->dma_tx);
if (host->dma_rx)
dma_release_channel(host->dma_rx);
destroy_workqueue(host->mmc_omap_wq);
return 0;
}
#if IS_BUILTIN(CONFIG_OF)
static const struct of_device_id mmc_omap_match[] = {
{ .compatible = "ti,omap2420-mmc", },
{ },
};
MODULE_DEVICE_TABLE(of, mmc_omap_match);
#endif
static struct platform_driver mmc_omap_driver = {
.probe = mmc_omap_probe,
.remove = mmc_omap_remove,
.driver = {
.name = DRIVER_NAME,
.of_match_table = of_match_ptr(mmc_omap_match),
},
};
module_platform_driver(mmc_omap_driver);
MODULE_DESCRIPTION("OMAP Multimedia Card driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRIVER_NAME);
MODULE_AUTHOR("Juha Yrjölä");
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