Linux Kernel iMX6
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/*
* linux/drivers/mmc/s3cmci.h - Samsung S3C MCI driver
*
* Copyright (C) 2004-2006 maintech GmbH, Thomas Kleffel <tk@maintech.de>
*
* Current driver maintained by Ben Dooks and Simtec Electronics
* Copyright (C) 2008 Simtec Electronics <ben-linux@fluff.org>
*
* 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/dma-mapping.h>
#include <linux/clk.h>
#include <linux/mmc/host.h>
#include <linux/platform_device.h>
#include <linux/cpufreq.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <mach/dma.h>
#include <mach/gpio-samsung.h>
#include <linux/platform_data/mmc-s3cmci.h>
#include "s3cmci.h"
#define DRIVER_NAME "s3c-mci"
#define S3C2410_SDICON (0x00)
#define S3C2410_SDIPRE (0x04)
#define S3C2410_SDICMDARG (0x08)
#define S3C2410_SDICMDCON (0x0C)
#define S3C2410_SDICMDSTAT (0x10)
#define S3C2410_SDIRSP0 (0x14)
#define S3C2410_SDIRSP1 (0x18)
#define S3C2410_SDIRSP2 (0x1C)
#define S3C2410_SDIRSP3 (0x20)
#define S3C2410_SDITIMER (0x24)
#define S3C2410_SDIBSIZE (0x28)
#define S3C2410_SDIDCON (0x2C)
#define S3C2410_SDIDCNT (0x30)
#define S3C2410_SDIDSTA (0x34)
#define S3C2410_SDIFSTA (0x38)
#define S3C2410_SDIDATA (0x3C)
#define S3C2410_SDIIMSK (0x40)
#define S3C2440_SDIDATA (0x40)
#define S3C2440_SDIIMSK (0x3C)
#define S3C2440_SDICON_SDRESET (1 << 8)
#define S3C2410_SDICON_SDIOIRQ (1 << 3)
#define S3C2410_SDICON_FIFORESET (1 << 1)
#define S3C2410_SDICON_CLOCKTYPE (1 << 0)
#define S3C2410_SDICMDCON_LONGRSP (1 << 10)
#define S3C2410_SDICMDCON_WAITRSP (1 << 9)
#define S3C2410_SDICMDCON_CMDSTART (1 << 8)
#define S3C2410_SDICMDCON_SENDERHOST (1 << 6)
#define S3C2410_SDICMDCON_INDEX (0x3f)
#define S3C2410_SDICMDSTAT_CRCFAIL (1 << 12)
#define S3C2410_SDICMDSTAT_CMDSENT (1 << 11)
#define S3C2410_SDICMDSTAT_CMDTIMEOUT (1 << 10)
#define S3C2410_SDICMDSTAT_RSPFIN (1 << 9)
#define S3C2440_SDIDCON_DS_WORD (2 << 22)
#define S3C2410_SDIDCON_TXAFTERRESP (1 << 20)
#define S3C2410_SDIDCON_RXAFTERCMD (1 << 19)
#define S3C2410_SDIDCON_BLOCKMODE (1 << 17)
#define S3C2410_SDIDCON_WIDEBUS (1 << 16)
#define S3C2410_SDIDCON_DMAEN (1 << 15)
#define S3C2410_SDIDCON_STOP (1 << 14)
#define S3C2440_SDIDCON_DATSTART (1 << 14)
#define S3C2410_SDIDCON_XFER_RXSTART (2 << 12)
#define S3C2410_SDIDCON_XFER_TXSTART (3 << 12)
#define S3C2410_SDIDCON_BLKNUM_MASK (0xFFF)
#define S3C2410_SDIDSTA_SDIOIRQDETECT (1 << 9)
#define S3C2410_SDIDSTA_FIFOFAIL (1 << 8)
#define S3C2410_SDIDSTA_CRCFAIL (1 << 7)
#define S3C2410_SDIDSTA_RXCRCFAIL (1 << 6)
#define S3C2410_SDIDSTA_DATATIMEOUT (1 << 5)
#define S3C2410_SDIDSTA_XFERFINISH (1 << 4)
#define S3C2410_SDIDSTA_TXDATAON (1 << 1)
#define S3C2410_SDIDSTA_RXDATAON (1 << 0)
#define S3C2440_SDIFSTA_FIFORESET (1 << 16)
#define S3C2440_SDIFSTA_FIFOFAIL (3 << 14)
#define S3C2410_SDIFSTA_TFDET (1 << 13)
#define S3C2410_SDIFSTA_RFDET (1 << 12)
#define S3C2410_SDIFSTA_COUNTMASK (0x7f)
#define S3C2410_SDIIMSK_RESPONSECRC (1 << 17)
#define S3C2410_SDIIMSK_CMDSENT (1 << 16)
#define S3C2410_SDIIMSK_CMDTIMEOUT (1 << 15)
#define S3C2410_SDIIMSK_RESPONSEND (1 << 14)
#define S3C2410_SDIIMSK_SDIOIRQ (1 << 12)
#define S3C2410_SDIIMSK_FIFOFAIL (1 << 11)
#define S3C2410_SDIIMSK_CRCSTATUS (1 << 10)
#define S3C2410_SDIIMSK_DATACRC (1 << 9)
#define S3C2410_SDIIMSK_DATATIMEOUT (1 << 8)
#define S3C2410_SDIIMSK_DATAFINISH (1 << 7)
#define S3C2410_SDIIMSK_TXFIFOHALF (1 << 4)
#define S3C2410_SDIIMSK_RXFIFOLAST (1 << 2)
#define S3C2410_SDIIMSK_RXFIFOHALF (1 << 0)
enum dbg_channels {
dbg_err = (1 << 0),
dbg_debug = (1 << 1),
dbg_info = (1 << 2),
dbg_irq = (1 << 3),
dbg_sg = (1 << 4),
dbg_dma = (1 << 5),
dbg_pio = (1 << 6),
dbg_fail = (1 << 7),
dbg_conf = (1 << 8),
};
static const int dbgmap_err = dbg_fail;
static const int dbgmap_info = dbg_info | dbg_conf;
static const int dbgmap_debug = dbg_err | dbg_debug;
#define dbg(host, channels, args...) \
do { \
if (dbgmap_err & channels) \
dev_err(&host->pdev->dev, args); \
else if (dbgmap_info & channels) \
dev_info(&host->pdev->dev, args); \
else if (dbgmap_debug & channels) \
dev_dbg(&host->pdev->dev, args); \
} while (0)
static struct s3c2410_dma_client s3cmci_dma_client = {
.name = "s3c-mci",
};
static void finalize_request(struct s3cmci_host *host);
static void s3cmci_send_request(struct mmc_host *mmc);
static void s3cmci_reset(struct s3cmci_host *host);
#ifdef CONFIG_MMC_DEBUG
static void dbg_dumpregs(struct s3cmci_host *host, char *prefix)
{
u32 con, pre, cmdarg, cmdcon, cmdsta, r0, r1, r2, r3, timer, bsize;
u32 datcon, datcnt, datsta, fsta, imask;
con = readl(host->base + S3C2410_SDICON);
pre = readl(host->base + S3C2410_SDIPRE);
cmdarg = readl(host->base + S3C2410_SDICMDARG);
cmdcon = readl(host->base + S3C2410_SDICMDCON);
cmdsta = readl(host->base + S3C2410_SDICMDSTAT);
r0 = readl(host->base + S3C2410_SDIRSP0);
r1 = readl(host->base + S3C2410_SDIRSP1);
r2 = readl(host->base + S3C2410_SDIRSP2);
r3 = readl(host->base + S3C2410_SDIRSP3);
timer = readl(host->base + S3C2410_SDITIMER);
bsize = readl(host->base + S3C2410_SDIBSIZE);
datcon = readl(host->base + S3C2410_SDIDCON);
datcnt = readl(host->base + S3C2410_SDIDCNT);
datsta = readl(host->base + S3C2410_SDIDSTA);
fsta = readl(host->base + S3C2410_SDIFSTA);
imask = readl(host->base + host->sdiimsk);
dbg(host, dbg_debug, "%s CON:[%08x] PRE:[%08x] TMR:[%08x]\n",
prefix, con, pre, timer);
dbg(host, dbg_debug, "%s CCON:[%08x] CARG:[%08x] CSTA:[%08x]\n",
prefix, cmdcon, cmdarg, cmdsta);
dbg(host, dbg_debug, "%s DCON:[%08x] FSTA:[%08x]"
" DSTA:[%08x] DCNT:[%08x]\n",
prefix, datcon, fsta, datsta, datcnt);
dbg(host, dbg_debug, "%s R0:[%08x] R1:[%08x]"
" R2:[%08x] R3:[%08x]\n",
prefix, r0, r1, r2, r3);
}
static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
int stop)
{
snprintf(host->dbgmsg_cmd, 300,
"#%u%s op:%i arg:0x%08x flags:0x08%x retries:%u",
host->ccnt, (stop ? " (STOP)" : ""),
cmd->opcode, cmd->arg, cmd->flags, cmd->retries);
if (cmd->data) {
snprintf(host->dbgmsg_dat, 300,
"#%u bsize:%u blocks:%u bytes:%u",
host->dcnt, cmd->data->blksz,
cmd->data->blocks,
cmd->data->blocks * cmd->data->blksz);
} else {
host->dbgmsg_dat[0] = '\0';
}
}
static void dbg_dumpcmd(struct s3cmci_host *host, struct mmc_command *cmd,
int fail)
{
unsigned int dbglvl = fail ? dbg_fail : dbg_debug;
if (!cmd)
return;
if (cmd->error == 0) {
dbg(host, dbglvl, "CMD[OK] %s R0:0x%08x\n",
host->dbgmsg_cmd, cmd->resp[0]);
} else {
dbg(host, dbglvl, "CMD[ERR %i] %s Status:%s\n",
cmd->error, host->dbgmsg_cmd, host->status);
}
if (!cmd->data)
return;
if (cmd->data->error == 0) {
dbg(host, dbglvl, "DAT[OK] %s\n", host->dbgmsg_dat);
} else {
dbg(host, dbglvl, "DAT[ERR %i] %s DCNT:0x%08x\n",
cmd->data->error, host->dbgmsg_dat,
readl(host->base + S3C2410_SDIDCNT));
}
}
#else
static void dbg_dumpcmd(struct s3cmci_host *host,
struct mmc_command *cmd, int fail) { }
static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
int stop) { }
static void dbg_dumpregs(struct s3cmci_host *host, char *prefix) { }
#endif /* CONFIG_MMC_DEBUG */
/**
* s3cmci_host_usedma - return whether the host is using dma or pio
* @host: The host state
*
* Return true if the host is using DMA to transfer data, else false
* to use PIO mode. Will return static data depending on the driver
* configuration.
*/
static inline bool s3cmci_host_usedma(struct s3cmci_host *host)
{
#ifdef CONFIG_MMC_S3C_PIO
return false;
#elif defined(CONFIG_MMC_S3C_DMA)
return true;
#else
return host->dodma;
#endif
}
/**
* s3cmci_host_canpio - return true if host has pio code available
*
* Return true if the driver has been compiled with the PIO support code
* available.
*/
static inline bool s3cmci_host_canpio(void)
{
#ifdef CONFIG_MMC_S3C_PIO
return true;
#else
return false;
#endif
}
static inline u32 enable_imask(struct s3cmci_host *host, u32 imask)
{
u32 newmask;
newmask = readl(host->base + host->sdiimsk);
newmask |= imask;
writel(newmask, host->base + host->sdiimsk);
return newmask;
}
static inline u32 disable_imask(struct s3cmci_host *host, u32 imask)
{
u32 newmask;
newmask = readl(host->base + host->sdiimsk);
newmask &= ~imask;
writel(newmask, host->base + host->sdiimsk);
return newmask;
}
static inline void clear_imask(struct s3cmci_host *host)
{
u32 mask = readl(host->base + host->sdiimsk);
/* preserve the SDIO IRQ mask state */
mask &= S3C2410_SDIIMSK_SDIOIRQ;
writel(mask, host->base + host->sdiimsk);
}
/**
* s3cmci_check_sdio_irq - test whether the SDIO IRQ is being signalled
* @host: The host to check.
*
* Test to see if the SDIO interrupt is being signalled in case the
* controller has failed to re-detect a card interrupt. Read GPE8 and
* see if it is low and if so, signal a SDIO interrupt.
*
* This is currently called if a request is finished (we assume that the
* bus is now idle) and when the SDIO IRQ is enabled in case the IRQ is
* already being indicated.
*/
static void s3cmci_check_sdio_irq(struct s3cmci_host *host)
{
if (host->sdio_irqen) {
if (gpio_get_value(S3C2410_GPE(8)) == 0) {
pr_debug("%s: signalling irq\n", __func__);
mmc_signal_sdio_irq(host->mmc);
}
}
}
static inline int get_data_buffer(struct s3cmci_host *host,
u32 *bytes, u32 **pointer)
{
struct scatterlist *sg;
if (host->pio_active == XFER_NONE)
return -EINVAL;
if ((!host->mrq) || (!host->mrq->data))
return -EINVAL;
if (host->pio_sgptr >= host->mrq->data->sg_len) {
dbg(host, dbg_debug, "no more buffers (%i/%i)\n",
host->pio_sgptr, host->mrq->data->sg_len);
return -EBUSY;
}
sg = &host->mrq->data->sg[host->pio_sgptr];
*bytes = sg->length;
*pointer = sg_virt(sg);
host->pio_sgptr++;
dbg(host, dbg_sg, "new buffer (%i/%i)\n",
host->pio_sgptr, host->mrq->data->sg_len);
return 0;
}
static inline u32 fifo_count(struct s3cmci_host *host)
{
u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
fifostat &= S3C2410_SDIFSTA_COUNTMASK;
return fifostat;
}
static inline u32 fifo_free(struct s3cmci_host *host)
{
u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
fifostat &= S3C2410_SDIFSTA_COUNTMASK;
return 63 - fifostat;
}
/**
* s3cmci_enable_irq - enable IRQ, after having disabled it.
* @host: The device state.
* @more: True if more IRQs are expected from transfer.
*
* Enable the main IRQ if needed after it has been disabled.
*
* The IRQ can be one of the following states:
* - disabled during IDLE
* - disabled whilst processing data
* - enabled during transfer
* - enabled whilst awaiting SDIO interrupt detection
*/
static void s3cmci_enable_irq(struct s3cmci_host *host, bool more)
{
unsigned long flags;
bool enable = false;
local_irq_save(flags);
host->irq_enabled = more;
host->irq_disabled = false;
enable = more | host->sdio_irqen;
if (host->irq_state != enable) {
host->irq_state = enable;
if (enable)
enable_irq(host->irq);
else
disable_irq(host->irq);
}
local_irq_restore(flags);
}
/**
*
*/
static void s3cmci_disable_irq(struct s3cmci_host *host, bool transfer)
{
unsigned long flags;
local_irq_save(flags);
/* pr_debug("%s: transfer %d\n", __func__, transfer); */
host->irq_disabled = transfer;
if (transfer && host->irq_state) {
host->irq_state = false;
disable_irq(host->irq);
}
local_irq_restore(flags);
}
static void do_pio_read(struct s3cmci_host *host)
{
int res;
u32 fifo;
u32 *ptr;
u32 fifo_words;
void __iomem *from_ptr;
/* write real prescaler to host, it might be set slow to fix */
writel(host->prescaler, host->base + S3C2410_SDIPRE);
from_ptr = host->base + host->sdidata;
while ((fifo = fifo_count(host))) {
if (!host->pio_bytes) {
res = get_data_buffer(host, &host->pio_bytes,
&host->pio_ptr);
if (res) {
host->pio_active = XFER_NONE;
host->complete_what = COMPLETION_FINALIZE;
dbg(host, dbg_pio, "pio_read(): "
"complete (no more data).\n");
return;
}
dbg(host, dbg_pio,
"pio_read(): new target: [%i]@[%p]\n",
host->pio_bytes, host->pio_ptr);
}
dbg(host, dbg_pio,
"pio_read(): fifo:[%02i] buffer:[%03i] dcnt:[%08X]\n",
fifo, host->pio_bytes,
readl(host->base + S3C2410_SDIDCNT));
/* If we have reached the end of the block, we can
* read a word and get 1 to 3 bytes. If we in the
* middle of the block, we have to read full words,
* otherwise we will write garbage, so round down to
* an even multiple of 4. */
if (fifo >= host->pio_bytes)
fifo = host->pio_bytes;
else
fifo -= fifo & 3;
host->pio_bytes -= fifo;
host->pio_count += fifo;
fifo_words = fifo >> 2;
ptr = host->pio_ptr;
while (fifo_words--)
*ptr++ = readl(from_ptr);
host->pio_ptr = ptr;
if (fifo & 3) {
u32 n = fifo & 3;
u32 data = readl(from_ptr);
u8 *p = (u8 *)host->pio_ptr;
while (n--) {
*p++ = data;
data >>= 8;
}
}
}
if (!host->pio_bytes) {
res = get_data_buffer(host, &host->pio_bytes, &host->pio_ptr);
if (res) {
dbg(host, dbg_pio,
"pio_read(): complete (no more buffers).\n");
host->pio_active = XFER_NONE;
host->complete_what = COMPLETION_FINALIZE;
return;
}
}
enable_imask(host,
S3C2410_SDIIMSK_RXFIFOHALF | S3C2410_SDIIMSK_RXFIFOLAST);
}
static void do_pio_write(struct s3cmci_host *host)
{
void __iomem *to_ptr;
int res;
u32 fifo;
u32 *ptr;
to_ptr = host->base + host->sdidata;
while ((fifo = fifo_free(host)) > 3) {
if (!host->pio_bytes) {
res = get_data_buffer(host, &host->pio_bytes,
&host->pio_ptr);
if (res) {
dbg(host, dbg_pio,
"pio_write(): complete (no more data).\n");
host->pio_active = XFER_NONE;
return;
}
dbg(host, dbg_pio,
"pio_write(): new source: [%i]@[%p]\n",
host->pio_bytes, host->pio_ptr);
}
/* If we have reached the end of the block, we have to
* write exactly the remaining number of bytes. If we
* in the middle of the block, we have to write full
* words, so round down to an even multiple of 4. */
if (fifo >= host->pio_bytes)
fifo = host->pio_bytes;
else
fifo -= fifo & 3;
host->pio_bytes -= fifo;
host->pio_count += fifo;
fifo = (fifo + 3) >> 2;
ptr = host->pio_ptr;
while (fifo--)
writel(*ptr++, to_ptr);
host->pio_ptr = ptr;
}
enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
}
static void pio_tasklet(unsigned long data)
{
struct s3cmci_host *host = (struct s3cmci_host *) data;
s3cmci_disable_irq(host, true);
if (host->pio_active == XFER_WRITE)
do_pio_write(host);
if (host->pio_active == XFER_READ)
do_pio_read(host);
if (host->complete_what == COMPLETION_FINALIZE) {
clear_imask(host);
if (host->pio_active != XFER_NONE) {
dbg(host, dbg_err, "unfinished %s "
"- pio_count:[%u] pio_bytes:[%u]\n",
(host->pio_active == XFER_READ) ? "read" : "write",
host->pio_count, host->pio_bytes);
if (host->mrq->data)
host->mrq->data->error = -EINVAL;
}
s3cmci_enable_irq(host, false);
finalize_request(host);
} else
s3cmci_enable_irq(host, true);
}
/*
* ISR for SDI Interface IRQ
* Communication between driver and ISR works as follows:
* host->mrq points to current request
* host->complete_what Indicates when the request is considered done
* COMPLETION_CMDSENT when the command was sent
* COMPLETION_RSPFIN when a response was received
* COMPLETION_XFERFINISH when the data transfer is finished
* COMPLETION_XFERFINISH_RSPFIN both of the above.
* host->complete_request is the completion-object the driver waits for
*
* 1) Driver sets up host->mrq and host->complete_what
* 2) Driver prepares the transfer
* 3) Driver enables interrupts
* 4) Driver starts transfer
* 5) Driver waits for host->complete_rquest
* 6) ISR checks for request status (errors and success)
* 6) ISR sets host->mrq->cmd->error and host->mrq->data->error
* 7) ISR completes host->complete_request
* 8) ISR disables interrupts
* 9) Driver wakes up and takes care of the request
*
* Note: "->error"-fields are expected to be set to 0 before the request
* was issued by mmc.c - therefore they are only set, when an error
* contition comes up
*/
static irqreturn_t s3cmci_irq(int irq, void *dev_id)
{
struct s3cmci_host *host = dev_id;
struct mmc_command *cmd;
u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
u32 mci_cclear = 0, mci_dclear;
unsigned long iflags;
mci_dsta = readl(host->base + S3C2410_SDIDSTA);
mci_imsk = readl(host->base + host->sdiimsk);
if (mci_dsta & S3C2410_SDIDSTA_SDIOIRQDETECT) {
if (mci_imsk & S3C2410_SDIIMSK_SDIOIRQ) {
mci_dclear = S3C2410_SDIDSTA_SDIOIRQDETECT;
writel(mci_dclear, host->base + S3C2410_SDIDSTA);
mmc_signal_sdio_irq(host->mmc);
return IRQ_HANDLED;
}
}
spin_lock_irqsave(&host->complete_lock, iflags);
mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
mci_fsta = readl(host->base + S3C2410_SDIFSTA);
mci_dclear = 0;
if ((host->complete_what == COMPLETION_NONE) ||
(host->complete_what == COMPLETION_FINALIZE)) {
host->status = "nothing to complete";
clear_imask(host);
goto irq_out;
}
if (!host->mrq) {
host->status = "no active mrq";
clear_imask(host);
goto irq_out;
}
cmd = host->cmd_is_stop ? host->mrq->stop : host->mrq->cmd;
if (!cmd) {
host->status = "no active cmd";
clear_imask(host);
goto irq_out;
}
if (!s3cmci_host_usedma(host)) {
if ((host->pio_active == XFER_WRITE) &&
(mci_fsta & S3C2410_SDIFSTA_TFDET)) {
disable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
tasklet_schedule(&host->pio_tasklet);
host->status = "pio tx";
}
if ((host->pio_active == XFER_READ) &&
(mci_fsta & S3C2410_SDIFSTA_RFDET)) {
disable_imask(host,
S3C2410_SDIIMSK_RXFIFOHALF |
S3C2410_SDIIMSK_RXFIFOLAST);
tasklet_schedule(&host->pio_tasklet);
host->status = "pio rx";
}
}
if (mci_csta & S3C2410_SDICMDSTAT_CMDTIMEOUT) {
dbg(host, dbg_err, "CMDSTAT: error CMDTIMEOUT\n");
cmd->error = -ETIMEDOUT;
host->status = "error: command timeout";
goto fail_transfer;
}
if (mci_csta & S3C2410_SDICMDSTAT_CMDSENT) {
if (host->complete_what == COMPLETION_CMDSENT) {
host->status = "ok: command sent";
goto close_transfer;
}
mci_cclear |= S3C2410_SDICMDSTAT_CMDSENT;
}
if (mci_csta & S3C2410_SDICMDSTAT_CRCFAIL) {
if (cmd->flags & MMC_RSP_CRC) {
if (host->mrq->cmd->flags & MMC_RSP_136) {
dbg(host, dbg_irq,
"fixup: ignore CRC fail with long rsp\n");
} else {
/* note, we used to fail the transfer
* here, but it seems that this is just
* the hardware getting it wrong.
*
* cmd->error = -EILSEQ;
* host->status = "error: bad command crc";
* goto fail_transfer;
*/
}
}
mci_cclear |= S3C2410_SDICMDSTAT_CRCFAIL;
}
if (mci_csta & S3C2410_SDICMDSTAT_RSPFIN) {
if (host->complete_what == COMPLETION_RSPFIN) {
host->status = "ok: command response received";
goto close_transfer;
}
if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
host->complete_what = COMPLETION_XFERFINISH;
mci_cclear |= S3C2410_SDICMDSTAT_RSPFIN;
}
/* errors handled after this point are only relevant
when a data transfer is in progress */
if (!cmd->data)
goto clear_status_bits;
/* Check for FIFO failure */
if (host->is2440) {
if (mci_fsta & S3C2440_SDIFSTA_FIFOFAIL) {
dbg(host, dbg_err, "FIFO failure\n");
host->mrq->data->error = -EILSEQ;
host->status = "error: 2440 fifo failure";
goto fail_transfer;
}
} else {
if (mci_dsta & S3C2410_SDIDSTA_FIFOFAIL) {
dbg(host, dbg_err, "FIFO failure\n");
cmd->data->error = -EILSEQ;
host->status = "error: fifo failure";
goto fail_transfer;
}
}
if (mci_dsta & S3C2410_SDIDSTA_RXCRCFAIL) {
dbg(host, dbg_err, "bad data crc (outgoing)\n");
cmd->data->error = -EILSEQ;
host->status = "error: bad data crc (outgoing)";
goto fail_transfer;
}
if (mci_dsta & S3C2410_SDIDSTA_CRCFAIL) {
dbg(host, dbg_err, "bad data crc (incoming)\n");
cmd->data->error = -EILSEQ;
host->status = "error: bad data crc (incoming)";
goto fail_transfer;
}
if (mci_dsta & S3C2410_SDIDSTA_DATATIMEOUT) {
dbg(host, dbg_err, "data timeout\n");
cmd->data->error = -ETIMEDOUT;
host->status = "error: data timeout";
goto fail_transfer;
}
if (mci_dsta & S3C2410_SDIDSTA_XFERFINISH) {
if (host->complete_what == COMPLETION_XFERFINISH) {
host->status = "ok: data transfer completed";
goto close_transfer;
}
if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
host->complete_what = COMPLETION_RSPFIN;
mci_dclear |= S3C2410_SDIDSTA_XFERFINISH;
}
clear_status_bits:
writel(mci_cclear, host->base + S3C2410_SDICMDSTAT);
writel(mci_dclear, host->base + S3C2410_SDIDSTA);
goto irq_out;
fail_transfer:
host->pio_active = XFER_NONE;
close_transfer:
host->complete_what = COMPLETION_FINALIZE;
clear_imask(host);
tasklet_schedule(&host->pio_tasklet);
goto irq_out;
irq_out:
dbg(host, dbg_irq,
"csta:0x%08x dsta:0x%08x fsta:0x%08x dcnt:0x%08x status:%s.\n",
mci_csta, mci_dsta, mci_fsta, mci_dcnt, host->status);
spin_unlock_irqrestore(&host->complete_lock, iflags);
return IRQ_HANDLED;
}
/*
* ISR for the CardDetect Pin
*/
static irqreturn_t s3cmci_irq_cd(int irq, void *dev_id)
{
struct s3cmci_host *host = (struct s3cmci_host *)dev_id;
dbg(host, dbg_irq, "card detect\n");
mmc_detect_change(host->mmc, msecs_to_jiffies(500));
return IRQ_HANDLED;
}
static void s3cmci_dma_done_callback(struct s3c2410_dma_chan *dma_ch,
void *buf_id, int size,
enum s3c2410_dma_buffresult result)
{
struct s3cmci_host *host = buf_id;
unsigned long iflags;
u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt;
mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
mci_dsta = readl(host->base + S3C2410_SDIDSTA);
mci_fsta = readl(host->base + S3C2410_SDIFSTA);
mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
BUG_ON(!host->mrq);
BUG_ON(!host->mrq->data);
BUG_ON(!host->dmatogo);
spin_lock_irqsave(&host->complete_lock, iflags);
if (result != S3C2410_RES_OK) {
dbg(host, dbg_fail, "DMA FAILED: csta=0x%08x dsta=0x%08x "
"fsta=0x%08x dcnt:0x%08x result:0x%08x toGo:%u\n",
mci_csta, mci_dsta, mci_fsta,
mci_dcnt, result, host->dmatogo);
goto fail_request;
}
host->dmatogo--;
if (host->dmatogo) {
dbg(host, dbg_dma, "DMA DONE Size:%i DSTA:[%08x] "
"DCNT:[%08x] toGo:%u\n",
size, mci_dsta, mci_dcnt, host->dmatogo);
goto out;
}
dbg(host, dbg_dma, "DMA FINISHED Size:%i DSTA:%08x DCNT:%08x\n",
size, mci_dsta, mci_dcnt);
host->dma_complete = 1;
host->complete_what = COMPLETION_FINALIZE;
out:
tasklet_schedule(&host->pio_tasklet);
spin_unlock_irqrestore(&host->complete_lock, iflags);
return;
fail_request:
host->mrq->data->error = -EINVAL;
host->complete_what = COMPLETION_FINALIZE;
clear_imask(host);
goto out;
}
static void finalize_request(struct s3cmci_host *host)
{
struct mmc_request *mrq = host->mrq;
struct mmc_command *cmd;
int debug_as_failure = 0;
if (host->complete_what != COMPLETION_FINALIZE)
return;
if (!mrq)
return;
cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
if (cmd->data && (cmd->error == 0) &&
(cmd->data->error == 0)) {
if (s3cmci_host_usedma(host) && (!host->dma_complete)) {
dbg(host, dbg_dma, "DMA Missing (%d)!\n",
host->dma_complete);
return;
}
}
/* Read response from controller. */
cmd->resp[0] = readl(host->base + S3C2410_SDIRSP0);
cmd->resp[1] = readl(host->base + S3C2410_SDIRSP1);
cmd->resp[2] = readl(host->base + S3C2410_SDIRSP2);
cmd->resp[3] = readl(host->base + S3C2410_SDIRSP3);
writel(host->prescaler, host->base + S3C2410_SDIPRE);
if (cmd->error)
debug_as_failure = 1;
if (cmd->data && cmd->data->error)
debug_as_failure = 1;
dbg_dumpcmd(host, cmd, debug_as_failure);
/* Cleanup controller */
writel(0, host->base + S3C2410_SDICMDARG);
writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
writel(0, host->base + S3C2410_SDICMDCON);
clear_imask(host);
if (cmd->data && cmd->error)
cmd->data->error = cmd->error;
if (cmd->data && cmd->data->stop && (!host->cmd_is_stop)) {
host->cmd_is_stop = 1;
s3cmci_send_request(host->mmc);
return;
}
/* If we have no data transfer we are finished here */
if (!mrq->data)
goto request_done;
/* Calculate the amout of bytes transfer if there was no error */
if (mrq->data->error == 0) {
mrq->data->bytes_xfered =
(mrq->data->blocks * mrq->data->blksz);
} else {
mrq->data->bytes_xfered = 0;
}
/* If we had an error while transferring data we flush the
* DMA channel and the fifo to clear out any garbage. */
if (mrq->data->error != 0) {
if (s3cmci_host_usedma(host))
s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
if (host->is2440) {
/* Clear failure register and reset fifo. */
writel(S3C2440_SDIFSTA_FIFORESET |
S3C2440_SDIFSTA_FIFOFAIL,
host->base + S3C2410_SDIFSTA);
} else {
u32 mci_con;
/* reset fifo */
mci_con = readl(host->base + S3C2410_SDICON);
mci_con |= S3C2410_SDICON_FIFORESET;
writel(mci_con, host->base + S3C2410_SDICON);
}
}
request_done:
host->complete_what = COMPLETION_NONE;
host->mrq = NULL;
s3cmci_check_sdio_irq(host);
mmc_request_done(host->mmc, mrq);
}
static void s3cmci_dma_setup(struct s3cmci_host *host,
enum dma_data_direction source)
{
static enum dma_data_direction last_source = -1;
static int setup_ok;
if (last_source == source)
return;
last_source = source;
s3c2410_dma_devconfig(host->dma, source,
host->mem->start + host->sdidata);
if (!setup_ok) {
s3c2410_dma_config(host->dma, 4);
s3c2410_dma_set_buffdone_fn(host->dma,
s3cmci_dma_done_callback);
s3c2410_dma_setflags(host->dma, S3C2410_DMAF_AUTOSTART);
setup_ok = 1;
}
}
static void s3cmci_send_command(struct s3cmci_host *host,
struct mmc_command *cmd)
{
u32 ccon, imsk;
imsk = S3C2410_SDIIMSK_CRCSTATUS | S3C2410_SDIIMSK_CMDTIMEOUT |
S3C2410_SDIIMSK_RESPONSEND | S3C2410_SDIIMSK_CMDSENT |
S3C2410_SDIIMSK_RESPONSECRC;
enable_imask(host, imsk);
if (cmd->data)
host->complete_what = COMPLETION_XFERFINISH_RSPFIN;
else if (cmd->flags & MMC_RSP_PRESENT)
host->complete_what = COMPLETION_RSPFIN;
else
host->complete_what = COMPLETION_CMDSENT;
writel(cmd->arg, host->base + S3C2410_SDICMDARG);
ccon = cmd->opcode & S3C2410_SDICMDCON_INDEX;
ccon |= S3C2410_SDICMDCON_SENDERHOST | S3C2410_SDICMDCON_CMDSTART;
if (cmd->flags & MMC_RSP_PRESENT)
ccon |= S3C2410_SDICMDCON_WAITRSP;
if (cmd->flags & MMC_RSP_136)
ccon |= S3C2410_SDICMDCON_LONGRSP;
writel(ccon, host->base + S3C2410_SDICMDCON);
}
static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
{
u32 dcon, imsk, stoptries = 3;
/* write DCON register */
if (!data) {
writel(0, host->base + S3C2410_SDIDCON);
return 0;
}
if ((data->blksz & 3) != 0) {
/* We cannot deal with unaligned blocks with more than
* one block being transferred. */
if (data->blocks > 1) {
pr_warning("%s: can't do non-word sized block transfers (blksz %d)\n", __func__, data->blksz);
return -EINVAL;
}
}
while (readl(host->base + S3C2410_SDIDSTA) &
(S3C2410_SDIDSTA_TXDATAON | S3C2410_SDIDSTA_RXDATAON)) {
dbg(host, dbg_err,
"mci_setup_data() transfer stillin progress.\n");
writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
s3cmci_reset(host);
if ((stoptries--) == 0) {
dbg_dumpregs(host, "DRF");
return -EINVAL;
}
}
dcon = data->blocks & S3C2410_SDIDCON_BLKNUM_MASK;
if (s3cmci_host_usedma(host))
dcon |= S3C2410_SDIDCON_DMAEN;
if (host->bus_width == MMC_BUS_WIDTH_4)
dcon |= S3C2410_SDIDCON_WIDEBUS;
if (!(data->flags & MMC_DATA_STREAM))
dcon |= S3C2410_SDIDCON_BLOCKMODE;
if (data->flags & MMC_DATA_WRITE) {
dcon |= S3C2410_SDIDCON_TXAFTERRESP;
dcon |= S3C2410_SDIDCON_XFER_TXSTART;
}
if (data->flags & MMC_DATA_READ) {
dcon |= S3C2410_SDIDCON_RXAFTERCMD;
dcon |= S3C2410_SDIDCON_XFER_RXSTART;
}
if (host->is2440) {
dcon |= S3C2440_SDIDCON_DS_WORD;
dcon |= S3C2440_SDIDCON_DATSTART;
}
writel(dcon, host->base + S3C2410_SDIDCON);
/* write BSIZE register */
writel(data->blksz, host->base + S3C2410_SDIBSIZE);
/* add to IMASK register */
imsk = S3C2410_SDIIMSK_FIFOFAIL | S3C2410_SDIIMSK_DATACRC |
S3C2410_SDIIMSK_DATATIMEOUT | S3C2410_SDIIMSK_DATAFINISH;
enable_imask(host, imsk);
/* write TIMER register */
if (host->is2440) {
writel(0x007FFFFF, host->base + S3C2410_SDITIMER);
} else {
writel(0x0000FFFF, host->base + S3C2410_SDITIMER);
/* FIX: set slow clock to prevent timeouts on read */
if (data->flags & MMC_DATA_READ)
writel(0xFF, host->base + S3C2410_SDIPRE);
}
return 0;
}
#define BOTH_DIR (MMC_DATA_WRITE | MMC_DATA_READ)
static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
{
int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
host->pio_sgptr = 0;
host->pio_bytes = 0;
host->pio_count = 0;
host->pio_active = rw ? XFER_WRITE : XFER_READ;
if (rw) {
do_pio_write(host);
enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
} else {
enable_imask(host, S3C2410_SDIIMSK_RXFIFOHALF
| S3C2410_SDIIMSK_RXFIFOLAST);
}
return 0;
}
static int s3cmci_prepare_dma(struct s3cmci_host *host, struct mmc_data *data)
{
int dma_len, i;
int rw = data->flags & MMC_DATA_WRITE;
BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
s3cmci_dma_setup(host, rw ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
rw ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
if (dma_len == 0)
return -ENOMEM;
host->dma_complete = 0;
host->dmatogo = dma_len;
for (i = 0; i < dma_len; i++) {
int res;
dbg(host, dbg_dma, "enqueue %i: %08x@%u\n", i,
sg_dma_address(&data->sg[i]),
sg_dma_len(&data->sg[i]));
res = s3c2410_dma_enqueue(host->dma, host,
sg_dma_address(&data->sg[i]),
sg_dma_len(&data->sg[i]));
if (res) {
s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
return -EBUSY;
}
}
s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_START);
return 0;
}
static void s3cmci_send_request(struct mmc_host *mmc)
{
struct s3cmci_host *host = mmc_priv(mmc);
struct mmc_request *mrq = host->mrq;
struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
host->ccnt++;
prepare_dbgmsg(host, cmd, host->cmd_is_stop);
/* Clear command, data and fifo status registers
Fifo clear only necessary on 2440, but doesn't hurt on 2410
*/
writel(0xFFFFFFFF, host->base + S3C2410_SDICMDSTAT);
writel(0xFFFFFFFF, host->base + S3C2410_SDIDSTA);
writel(0xFFFFFFFF, host->base + S3C2410_SDIFSTA);
if (cmd->data) {
int res = s3cmci_setup_data(host, cmd->data);
host->dcnt++;
if (res) {
dbg(host, dbg_err, "setup data error %d\n", res);
cmd->error = res;
cmd->data->error = res;
mmc_request_done(mmc, mrq);
return;
}
if (s3cmci_host_usedma(host))
res = s3cmci_prepare_dma(host, cmd->data);
else
res = s3cmci_prepare_pio(host, cmd->data);
if (res) {
dbg(host, dbg_err, "data prepare error %d\n", res);
cmd->error = res;
cmd->data->error = res;
mmc_request_done(mmc, mrq);
return;
}
}
/* Send command */
s3cmci_send_command(host, cmd);
/* Enable Interrupt */
s3cmci_enable_irq(host, true);
}
static int s3cmci_card_present(struct mmc_host *mmc)
{
struct s3cmci_host *host = mmc_priv(mmc);
struct s3c24xx_mci_pdata *pdata = host->pdata;
int ret;
if (pdata->no_detect)
return -ENOSYS;
ret = gpio_get_value(pdata->gpio_detect) ? 0 : 1;
return ret ^ pdata->detect_invert;
}
static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct s3cmci_host *host = mmc_priv(mmc);
host->status = "mmc request";
host->cmd_is_stop = 0;
host->mrq = mrq;
if (s3cmci_card_present(mmc) == 0) {
dbg(host, dbg_err, "%s: no medium present\n", __func__);
host->mrq->cmd->error = -ENOMEDIUM;
mmc_request_done(mmc, mrq);
} else
s3cmci_send_request(mmc);
}
static void s3cmci_set_clk(struct s3cmci_host *host, struct mmc_ios *ios)
{
u32 mci_psc;
/* Set clock */
for (mci_psc = 0; mci_psc < 255; mci_psc++) {
host->real_rate = host->clk_rate / (host->clk_div*(mci_psc+1));
if (host->real_rate <= ios->clock)
break;
}
if (mci_psc > 255)
mci_psc = 255;
host->prescaler = mci_psc;
writel(host->prescaler, host->base + S3C2410_SDIPRE);
/* If requested clock is 0, real_rate will be 0, too */
if (ios->clock == 0)
host->real_rate = 0;
}
static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct s3cmci_host *host = mmc_priv(mmc);
u32 mci_con;
/* Set the power state */
mci_con = readl(host->base + S3C2410_SDICON);
switch (ios->power_mode) {
case MMC_POWER_ON:
case MMC_POWER_UP:
/* Configure GPE5...GPE10 pins in SD mode */
s3c_gpio_cfgall_range(S3C2410_GPE(5), 6, S3C_GPIO_SFN(2),
S3C_GPIO_PULL_NONE);
if (host->pdata->set_power)
host->pdata->set_power(ios->power_mode, ios->vdd);
if (!host->is2440)
mci_con |= S3C2410_SDICON_FIFORESET;
break;
case MMC_POWER_OFF:
default:
gpio_direction_output(S3C2410_GPE(5), 0);
if (host->is2440)
mci_con |= S3C2440_SDICON_SDRESET;
if (host->pdata->set_power)
host->pdata->set_power(ios->power_mode, ios->vdd);
break;
}
s3cmci_set_clk(host, ios);
/* Set CLOCK_ENABLE */
if (ios->clock)
mci_con |= S3C2410_SDICON_CLOCKTYPE;
else
mci_con &= ~S3C2410_SDICON_CLOCKTYPE;
writel(mci_con, host->base + S3C2410_SDICON);
if ((ios->power_mode == MMC_POWER_ON) ||
(ios->power_mode == MMC_POWER_UP)) {
dbg(host, dbg_conf, "running at %lukHz (requested: %ukHz).\n",
host->real_rate/1000, ios->clock/1000);
} else {
dbg(host, dbg_conf, "powered down.\n");
}
host->bus_width = ios->bus_width;
}
static void s3cmci_reset(struct s3cmci_host *host)
{
u32 con = readl(host->base + S3C2410_SDICON);
con |= S3C2440_SDICON_SDRESET;
writel(con, host->base + S3C2410_SDICON);
}
static int s3cmci_get_ro(struct mmc_host *mmc)
{
struct s3cmci_host *host = mmc_priv(mmc);
struct s3c24xx_mci_pdata *pdata = host->pdata;
int ret;
if (pdata->no_wprotect)
return 0;
ret = gpio_get_value(pdata->gpio_wprotect) ? 1 : 0;
ret ^= pdata->wprotect_invert;
return ret;
}
static void s3cmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
struct s3cmci_host *host = mmc_priv(mmc);
unsigned long flags;
u32 con;
local_irq_save(flags);
con = readl(host->base + S3C2410_SDICON);
host->sdio_irqen = enable;
if (enable == host->sdio_irqen)
goto same_state;
if (enable) {
con |= S3C2410_SDICON_SDIOIRQ;
enable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
if (!host->irq_state && !host->irq_disabled) {
host->irq_state = true;
enable_irq(host->irq);
}
} else {
disable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
con &= ~S3C2410_SDICON_SDIOIRQ;
if (!host->irq_enabled && host->irq_state) {
disable_irq_nosync(host->irq);
host->irq_state = false;
}
}
writel(con, host->base + S3C2410_SDICON);
same_state:
local_irq_restore(flags);
s3cmci_check_sdio_irq(host);
}
static struct mmc_host_ops s3cmci_ops = {
.request = s3cmci_request,
.set_ios = s3cmci_set_ios,
.get_ro = s3cmci_get_ro,
.get_cd = s3cmci_card_present,
.enable_sdio_irq = s3cmci_enable_sdio_irq,
};
static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
/* This is currently here to avoid a number of if (host->pdata)
* checks. Any zero fields to ensure reasonable defaults are picked. */
.no_wprotect = 1,
.no_detect = 1,
};
#ifdef CONFIG_CPU_FREQ
static int s3cmci_cpufreq_transition(struct notifier_block *nb,
unsigned long val, void *data)
{
struct s3cmci_host *host;
struct mmc_host *mmc;
unsigned long newclk;
unsigned long flags;
host = container_of(nb, struct s3cmci_host, freq_transition);
newclk = clk_get_rate(host->clk);
mmc = host->mmc;
if ((val == CPUFREQ_PRECHANGE && newclk > host->clk_rate) ||
(val == CPUFREQ_POSTCHANGE && newclk < host->clk_rate)) {
spin_lock_irqsave(&mmc->lock, flags);
host->clk_rate = newclk;
if (mmc->ios.power_mode != MMC_POWER_OFF &&
mmc->ios.clock != 0)
s3cmci_set_clk(host, &mmc->ios);
spin_unlock_irqrestore(&mmc->lock, flags);
}
return 0;
}
static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
{
host->freq_transition.notifier_call = s3cmci_cpufreq_transition;
return cpufreq_register_notifier(&host->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
}
static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
{
cpufreq_unregister_notifier(&host->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
}
#else
static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
{
return 0;
}
static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
{
}
#endif
#ifdef CONFIG_DEBUG_FS
static int s3cmci_state_show(struct seq_file *seq, void *v)
{
struct s3cmci_host *host = seq->private;
seq_printf(seq, "Register base = 0x%08x\n", (u32)host->base);
seq_printf(seq, "Clock rate = %ld\n", host->clk_rate);
seq_printf(seq, "Prescale = %d\n", host->prescaler);
seq_printf(seq, "is2440 = %d\n", host->is2440);
seq_printf(seq, "IRQ = %d\n", host->irq);
seq_printf(seq, "IRQ enabled = %d\n", host->irq_enabled);
seq_printf(seq, "IRQ disabled = %d\n", host->irq_disabled);
seq_printf(seq, "IRQ state = %d\n", host->irq_state);
seq_printf(seq, "CD IRQ = %d\n", host->irq_cd);
seq_printf(seq, "Do DMA = %d\n", s3cmci_host_usedma(host));
seq_printf(seq, "SDIIMSK at %d\n", host->sdiimsk);
seq_printf(seq, "SDIDATA at %d\n", host->sdidata);
return 0;
}
static int s3cmci_state_open(struct inode *inode, struct file *file)
{
return single_open(file, s3cmci_state_show, inode->i_private);
}
static const struct file_operations s3cmci_fops_state = {
.owner = THIS_MODULE,
.open = s3cmci_state_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#define DBG_REG(_r) { .addr = S3C2410_SDI##_r, .name = #_r }
struct s3cmci_reg {
unsigned short addr;
unsigned char *name;
} debug_regs[] = {
DBG_REG(CON),
DBG_REG(PRE),
DBG_REG(CMDARG),
DBG_REG(CMDCON),
DBG_REG(CMDSTAT),
DBG_REG(RSP0),
DBG_REG(RSP1),
DBG_REG(RSP2),
DBG_REG(RSP3),
DBG_REG(TIMER),
DBG_REG(BSIZE),
DBG_REG(DCON),
DBG_REG(DCNT),
DBG_REG(DSTA),
DBG_REG(FSTA),
{}
};
static int s3cmci_regs_show(struct seq_file *seq, void *v)
{
struct s3cmci_host *host = seq->private;
struct s3cmci_reg *rptr = debug_regs;
for (; rptr->name; rptr++)
seq_printf(seq, "SDI%s\t=0x%08x\n", rptr->name,
readl(host->base + rptr->addr));
seq_printf(seq, "SDIIMSK\t=0x%08x\n", readl(host->base + host->sdiimsk));
return 0;
}
static int s3cmci_regs_open(struct inode *inode, struct file *file)
{
return single_open(file, s3cmci_regs_show, inode->i_private);
}
static const struct file_operations s3cmci_fops_regs = {
.owner = THIS_MODULE,
.open = s3cmci_regs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void s3cmci_debugfs_attach(struct s3cmci_host *host)
{
struct device *dev = &host->pdev->dev;
host->debug_root = debugfs_create_dir(dev_name(dev), NULL);
if (IS_ERR(host->debug_root)) {
dev_err(dev, "failed to create debugfs root\n");
return;
}
host->debug_state = debugfs_create_file("state", 0444,
host->debug_root, host,
&s3cmci_fops_state);
if (IS_ERR(host->debug_state))
dev_err(dev, "failed to create debug state file\n");
host->debug_regs = debugfs_create_file("regs", 0444,
host->debug_root, host,
&s3cmci_fops_regs);
if (IS_ERR(host->debug_regs))
dev_err(dev, "failed to create debug regs file\n");
}
static void s3cmci_debugfs_remove(struct s3cmci_host *host)
{
debugfs_remove(host->debug_regs);
debugfs_remove(host->debug_state);
debugfs_remove(host->debug_root);
}
#else
static inline void s3cmci_debugfs_attach(struct s3cmci_host *host) { }
static inline void s3cmci_debugfs_remove(struct s3cmci_host *host) { }
#endif /* CONFIG_DEBUG_FS */
static int s3cmci_probe(struct platform_device *pdev)
{
struct s3cmci_host *host;
struct mmc_host *mmc;
int ret;
int is2440;
int i;
is2440 = platform_get_device_id(pdev)->driver_data;
mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
if (!mmc) {
ret = -ENOMEM;
goto probe_out;
}
for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++) {
ret = gpio_request(i, dev_name(&pdev->dev));
if (ret) {
dev_err(&pdev->dev, "failed to get gpio %d\n", i);
for (i--; i >= S3C2410_GPE(5); i--)
gpio_free(i);
goto probe_free_host;
}
}
host = mmc_priv(mmc);
host->mmc = mmc;
host->pdev = pdev;
host->is2440 = is2440;
host->pdata = pdev->dev.platform_data;
if (!host->pdata) {
pdev->dev.platform_data = &s3cmci_def_pdata;
host->pdata = &s3cmci_def_pdata;
}
spin_lock_init(&host->complete_lock);
tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
if (is2440) {
host->sdiimsk = S3C2440_SDIIMSK;
host->sdidata = S3C2440_SDIDATA;
host->clk_div = 1;
} else {
host->sdiimsk = S3C2410_SDIIMSK;
host->sdidata = S3C2410_SDIDATA;
host->clk_div = 2;
}
host->complete_what = COMPLETION_NONE;
host->pio_active = XFER_NONE;
#ifdef CONFIG_MMC_S3C_PIODMA
host->dodma = host->pdata->use_dma;
#endif
host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!host->mem) {
dev_err(&pdev->dev,
"failed to get io memory region resource.\n");
ret = -ENOENT;
goto probe_free_gpio;
}
host->mem = request_mem_region(host->mem->start,
resource_size(host->mem), pdev->name);
if (!host->mem) {
dev_err(&pdev->dev, "failed to request io memory region.\n");
ret = -ENOENT;
goto probe_free_gpio;
}
host->base = ioremap(host->mem->start, resource_size(host->mem));
if (!host->base) {
dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
ret = -EINVAL;
goto probe_free_mem_region;
}
host->irq = platform_get_irq(pdev, 0);
if (host->irq == 0) {
dev_err(&pdev->dev, "failed to get interrupt resource.\n");
ret = -EINVAL;
goto probe_iounmap;
}
if (request_irq(host->irq, s3cmci_irq, 0, DRIVER_NAME, host)) {
dev_err(&pdev->dev, "failed to request mci interrupt.\n");
ret = -ENOENT;
goto probe_iounmap;
}
/* We get spurious interrupts even when we have set the IMSK
* register to ignore everything, so use disable_irq() to make
* ensure we don't lock the system with un-serviceable requests. */
disable_irq(host->irq);
host->irq_state = false;
if (!host->pdata->no_detect) {
ret = gpio_request(host->pdata->gpio_detect, "s3cmci detect");
if (ret) {
dev_err(&pdev->dev, "failed to get detect gpio\n");
goto probe_free_irq;
}
host->irq_cd = gpio_to_irq(host->pdata->gpio_detect);
if (host->irq_cd >= 0) {
if (request_irq(host->irq_cd, s3cmci_irq_cd,
IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING,
DRIVER_NAME, host)) {
dev_err(&pdev->dev,
"can't get card detect irq.\n");
ret = -ENOENT;
goto probe_free_gpio_cd;
}
} else {
dev_warn(&pdev->dev,
"host detect has no irq available\n");
gpio_direction_input(host->pdata->gpio_detect);
}
} else
host->irq_cd = -1;
if (!host->pdata->no_wprotect) {
ret = gpio_request(host->pdata->gpio_wprotect, "s3cmci wp");
if (ret) {
dev_err(&pdev->dev, "failed to get writeprotect\n");
goto probe_free_irq_cd;
}
gpio_direction_input(host->pdata->gpio_wprotect);
}
/* depending on the dma state, get a dma channel to use. */
if (s3cmci_host_usedma(host)) {
host->dma = s3c2410_dma_request(DMACH_SDI, &s3cmci_dma_client,
host);
if (host->dma < 0) {
dev_err(&pdev->dev, "cannot get DMA channel.\n");
if (!s3cmci_host_canpio()) {
ret = -EBUSY;
goto probe_free_gpio_wp;
} else {
dev_warn(&pdev->dev, "falling back to PIO.\n");
host->dodma = 0;
}
}
}
host->clk = clk_get(&pdev->dev, "sdi");
if (IS_ERR(host->clk)) {
dev_err(&pdev->dev, "failed to find clock source.\n");
ret = PTR_ERR(host->clk);
host->clk = NULL;
goto probe_free_dma;
}
ret = clk_enable(host->clk);
if (ret) {
dev_err(&pdev->dev, "failed to enable clock source.\n");
goto clk_free;
}
host->clk_rate = clk_get_rate(host->clk);
mmc->ops = &s3cmci_ops;
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
#ifdef CONFIG_MMC_S3C_HW_SDIO_IRQ
mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
#else
mmc->caps = MMC_CAP_4_BIT_DATA;
#endif
mmc->f_min = host->clk_rate / (host->clk_div * 256);
mmc->f_max = host->clk_rate / host->clk_div;
if (host->pdata->ocr_avail)
mmc->ocr_avail = host->pdata->ocr_avail;
mmc->max_blk_count = 4095;
mmc->max_blk_size = 4095;
mmc->max_req_size = 4095 * 512;
mmc->max_seg_size = mmc->max_req_size;
mmc->max_segs = 128;
dbg(host, dbg_debug,
"probe: mode:%s mapped mci_base:%p irq:%u irq_cd:%u dma:%u.\n",
(host->is2440?"2440":""),
host->base, host->irq, host->irq_cd, host->dma);
ret = s3cmci_cpufreq_register(host);
if (ret) {
dev_err(&pdev->dev, "failed to register cpufreq\n");
goto free_dmabuf;
}
ret = mmc_add_host(mmc);
if (ret) {
dev_err(&pdev->dev, "failed to add mmc host.\n");
goto free_cpufreq;
}
s3cmci_debugfs_attach(host);
platform_set_drvdata(pdev, mmc);
dev_info(&pdev->dev, "%s - using %s, %s SDIO IRQ\n", mmc_hostname(mmc),
s3cmci_host_usedma(host) ? "dma" : "pio",
mmc->caps & MMC_CAP_SDIO_IRQ ? "hw" : "sw");
return 0;
free_cpufreq:
s3cmci_cpufreq_deregister(host);
free_dmabuf:
clk_disable(host->clk);
clk_free:
clk_put(host->clk);
probe_free_dma:
if (s3cmci_host_usedma(host))
s3c2410_dma_free(host->dma, &s3cmci_dma_client);
probe_free_gpio_wp:
if (!host->pdata->no_wprotect)
gpio_free(host->pdata->gpio_wprotect);
probe_free_gpio_cd:
if (!host->pdata->no_detect)
gpio_free(host->pdata->gpio_detect);
probe_free_irq_cd:
if (host->irq_cd >= 0)
free_irq(host->irq_cd, host);
probe_free_irq:
free_irq(host->irq, host);
probe_iounmap:
iounmap(host->base);
probe_free_mem_region:
release_mem_region(host->mem->start, resource_size(host->mem));
probe_free_gpio:
for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
gpio_free(i);
probe_free_host:
mmc_free_host(mmc);
probe_out:
return ret;
}
static void s3cmci_shutdown(struct platform_device *pdev)
{
struct mmc_host *mmc = platform_get_drvdata(pdev);
struct s3cmci_host *host = mmc_priv(mmc);
if (host->irq_cd >= 0)
free_irq(host->irq_cd, host);
s3cmci_debugfs_remove(host);
s3cmci_cpufreq_deregister(host);
mmc_remove_host(mmc);
clk_disable(host->clk);
}
static int s3cmci_remove(struct platform_device *pdev)
{
struct mmc_host *mmc = platform_get_drvdata(pdev);
struct s3cmci_host *host = mmc_priv(mmc);
struct s3c24xx_mci_pdata *pd = host->pdata;
int i;
s3cmci_shutdown(pdev);
clk_put(host->clk);
tasklet_disable(&host->pio_tasklet);
if (s3cmci_host_usedma(host))
s3c2410_dma_free(host->dma, &s3cmci_dma_client);
free_irq(host->irq, host);
if (!pd->no_wprotect)
gpio_free(pd->gpio_wprotect);
if (!pd->no_detect)
gpio_free(pd->gpio_detect);
for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
gpio_free(i);
iounmap(host->base);
release_mem_region(host->mem->start, resource_size(host->mem));
mmc_free_host(mmc);
return 0;
}
static struct platform_device_id s3cmci_driver_ids[] = {
{
.name = "s3c2410-sdi",
.driver_data = 0,
}, {
.name = "s3c2412-sdi",
.driver_data = 1,
}, {
.name = "s3c2440-sdi",
.driver_data = 1,
},
{ }
};
MODULE_DEVICE_TABLE(platform, s3cmci_driver_ids);
static struct platform_driver s3cmci_driver = {
.driver = {
.name = "s3c-sdi",
.owner = THIS_MODULE,
},
.id_table = s3cmci_driver_ids,
.probe = s3cmci_probe,
.remove = s3cmci_remove,
.shutdown = s3cmci_shutdown,
};
module_platform_driver(s3cmci_driver);
MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Thomas Kleffel <tk@maintech.de>, Ben Dooks <ben-linux@fluff.org>");