Commit 81569012 authored by Madhusudhan Chikkature Rajashekar's avatar Madhusudhan Chikkature Rajashekar Committed by Tony Lindgren

MMC/SD Controller driver for OMAP2430

This patch adds MMC controller driver for OMAP2430/3430.

Signed-off-by: Madhusudhan Chikkature<madhu.cr@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 07354f8f
......@@ -54,7 +54,7 @@ config MMC_RICOH_MMC
config MMC_OMAP
tristate "TI OMAP Multimedia Card Interface support"
depends on ARCH_OMAP
depends on ARCH_OMAP1 || (ARCH_OMAP2 && ARCH_OMAP2420)
select TPS65010 if MACH_OMAP_H2
select OMAP_GPIO_SWITCH if MACH_NOKIA_N800
help
......@@ -64,6 +64,17 @@ config MMC_OMAP
If unsure, say N.
config MMC_OMAP_HS
tristate "TI OMAP High Speed Multimedia Card Interface support"
depends on (ARCH_OMAP2 && ARCH_OMAP2430) || ARCH_OMAP3
select TWL4030_CORE if MACH_OMAP_2430SDP || MACH_OMAP_3430SDP
help
This selects the TI OMAP High Speed Multimedia card Interface.
If you have an OMAP2(2430) or OMAP3 board with a Multimedia Card slot,
say Y or M here.
If unsure, say N.
config MMC_WBSD
tristate "Winbond W83L51xD SD/MMC Card Interface support"
depends on ISA_DMA_API
......
......@@ -14,6 +14,7 @@ obj-$(CONFIG_MMC_RICOH_MMC) += ricoh_mmc.o
obj-$(CONFIG_MMC_WBSD) += wbsd.o
obj-$(CONFIG_MMC_AU1X) += au1xmmc.o
obj-$(CONFIG_MMC_OMAP) += omap.o
obj-$(CONFIG_MMC_OMAP_HS) += omap_hsmmc.o
obj-$(CONFIG_MMC_AT91) += at91_mci.o
obj-$(CONFIG_MMC_TIFM_SD) += tifm_sd.o
obj-$(CONFIG_MMC_SPI) += mmc_spi.o
......
/*
* drivers/mmc/host/omap_hsmmc.c
*
* Driver for OMAP2430/3430 MMC controller.
*
* Copyright (C) 2007 Texas Instruments.
*
* Authors:
* Syed Mohammed Khasim <x0khasim@ti.com>
* Madhusudhan <madhu.cr@ti.com>
* Mohit Jalori <mjalori@ti.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/timer.h>
#include <linux/clk.h>
#include <linux/mmc/host.h>
#include <linux/io.h>
#include <asm/semaphore.h>
#include <asm/dma.h>
#include <asm/hardware.h>
#include <asm/arch/board.h>
#include <asm/arch/mmc.h>
#include <asm/arch/cpu.h>
/* OMAP HSMMC Host Controller Registers */
#define OMAP_HSMMC_SYSCONFIG 0x0010
#define OMAP_HSMMC_CON 0x002C
#define OMAP_HSMMC_BLK 0x0104
#define OMAP_HSMMC_ARG 0x0108
#define OMAP_HSMMC_CMD 0x010C
#define OMAP_HSMMC_RSP10 0x0110
#define OMAP_HSMMC_RSP32 0x0114
#define OMAP_HSMMC_RSP54 0x0118
#define OMAP_HSMMC_RSP76 0x011C
#define OMAP_HSMMC_DATA 0x0120
#define OMAP_HSMMC_HCTL 0x0128
#define OMAP_HSMMC_SYSCTL 0x012C
#define OMAP_HSMMC_STAT 0x0130
#define OMAP_HSMMC_IE 0x0134
#define OMAP_HSMMC_ISE 0x0138
#define OMAP_HSMMC_CAPA 0x0140
#define VS18 (1<<26)
#define VS30 (1<<25)
#define SDVS18 (0x5<<9)
#define SDVS30 (0x6<<9)
#define SDVSCLR 0xFFFFF1FF
#define SDVSDET 0x00000400
#define AUTOIDLE 0x1
#define SDBP (1<<8)
#define DTO 0xe
#define ICE 0x1
#define ICS 0x2
#define CEN (1<<2)
#define CLKD_MASK 0x0000FFC0
#define INT_EN_MASK 0x307F0033
#define INIT_STREAM (1<<1)
#define DP_SELECT (1<<21)
#define DDIR (1<<4)
#define DMA_EN 0x1
#define MSBS 1<<5
#define BCE 1<<1
#define FOUR_BIT 1 << 1
#define CC 0x1
#define TC 0x02
#define OD 0x1
#define ERR (1 << 15)
#define CMD_TIMEOUT (1 << 16)
#define DATA_TIMEOUT (1 << 20)
#define CMD_CRC (1 << 17)
#define DATA_CRC (1 << 21)
#define CARD_ERR (1 << 28)
#define STAT_CLEAR 0xFFFFFFFF
#define INIT_STREAM_CMD 0x00000000
#define DUAL_VOLT_OCR_BIT 7
#define OMAP_MMC1_DEVID 1
#define OMAP_MMC2_DEVID 2
#define OMAP_MMC_DATADIR_NONE 0
#define OMAP_MMC_DATADIR_READ 1
#define OMAP_MMC_DATADIR_WRITE 2
#define MMC_TIMEOUT_MS 20
#define OMAP_MMC_MASTER_CLOCK 96000000
#define DRIVER_NAME "mmci-omap"
/*
* slot_id is device id - 1, device id is a static value
* of 1 to represent device 1 etc..
*/
#define mmc_slot(host) (host->pdata->slots[host->slot_id])
/*
* MMC Host controller read/write API's
*/
#define OMAP_HSMMC_READ(base, reg) \
__raw_readl((base) + OMAP_HSMMC_##reg)
#define OMAP_HSMMC_WRITE(base, reg, val) \
__raw_writel((val), (base) + OMAP_HSMMC_##reg)
struct mmc_omap_host {
struct device *dev;
struct mmc_host *mmc;
struct mmc_request *mrq;
struct mmc_command *cmd;
struct mmc_data *data;
struct clk *fclk;
struct clk *iclk;
struct clk *dbclk;
struct semaphore sem;
struct work_struct mmc_carddetect_work;
void __iomem *base;
resource_size_t mapbase;
unsigned int id;
unsigned int dma_len;
unsigned int dma_dir;
unsigned char bus_mode;
unsigned char datadir;
u32 *buffer;
u32 bytesleft;
int suspended;
int irq;
int carddetect;
int use_dma, dma_ch;
int initstr;
int slot_id;
int dbclk_enabled;
struct omap_mmc_platform_data *pdata;
};
/*
* Stop clock to the card
*/
static void omap_mmc_stop_clock(struct mmc_omap_host *host)
{
OMAP_HSMMC_WRITE(host->base, SYSCTL,
OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped");
}
/*
* Send init stream sequence to card
* before sending IDLE command
*/
static void send_init_stream(struct mmc_omap_host *host)
{
int reg = 0;
unsigned long timeout;
disable_irq(host->irq);
OMAP_HSMMC_WRITE(host->base, CON,
OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
while ((reg != CC) && time_before(jiffies, timeout))
reg = OMAP_HSMMC_READ(host->base, STAT) & CC;
OMAP_HSMMC_WRITE(host->base, CON,
OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
enable_irq(host->irq);
}
/*
* Configure the response type and send the cmd.
*/
static void
mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd,
struct mmc_data *data)
{
int cmdreg = 0, resptype = 0, cmdtype = 0;
dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
host->cmd = cmd;
/*
* Clear status bits and enable interrupts
*/
OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136)
resptype = 1;
else
resptype = 2;
}
/*
* Unlike OMAP1 controller, the cmdtype does not seem to be based on
* ac, bc, adtc, bcr. Only CMD12 needs a val of 0x3, rest 0x0.
*/
if (cmd->opcode == 12)
cmdtype = 0x3;
cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
if (data) {
cmdreg |= DP_SELECT | MSBS | BCE;
if (data->flags & MMC_DATA_READ)
cmdreg |= DDIR;
else
cmdreg &= ~(DDIR);
}
if (host->use_dma)
cmdreg |= DMA_EN;
OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
}
/*
* Notify the transfer complete to MMC core
*/
static void
mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
{
host->data = NULL;
if (host->use_dma && host->dma_ch != -1)
dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
host->dma_dir);
host->datadir = OMAP_MMC_DATADIR_NONE;
if (!data->error)
data->bytes_xfered += data->blocks * (data->blksz);
else
data->bytes_xfered = 0;
if (!data->stop) {
host->mrq = NULL;
mmc_request_done(host->mmc, data->mrq);
return;
}
mmc_omap_start_command(host, data->stop, NULL);
}
/*
* Notify the core about command completion
*/
static void
mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
{
host->cmd = NULL;
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136) {
/* response type 2 */
cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
} else {
/* response types 1, 1b, 3, 4, 5, 6 */
cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
}
}
if (host->data == NULL || cmd->error) {
host->mrq = NULL;
mmc_request_done(host->mmc, cmd->mrq);
}
}
/*
* DMA clean up for command errors
*/
static void mmc_dma_cleanup(struct mmc_omap_host *host)
{
host->data->error = -ETIMEDOUT;
if (host->use_dma && host->dma_ch != -1) {
dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len,
host->dma_dir);
omap_free_dma(host->dma_ch);
host->dma_ch = -1;
up(&host->sem);
}
host->data = NULL;
host->datadir = OMAP_MMC_DATADIR_NONE;
}
/*
* MMC controller IRQ handler
*/
static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
{
struct mmc_omap_host *host = dev_id;
int end_cmd = 0, end_trans = 0, status;
if (host->cmd == NULL && host->data == NULL) {
OMAP_HSMMC_WRITE(host->base, STAT,
OMAP_HSMMC_READ(host->base, STAT));
return IRQ_HANDLED;
}
status = OMAP_HSMMC_READ(host->base, STAT);
dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
if (status & ERR) {
if ((status & CMD_TIMEOUT) ||
(status & CMD_CRC)) {
if (host->cmd) {
if (status & CMD_TIMEOUT)
host->cmd->error = -ETIMEDOUT;
else
host->cmd->error = -EILSEQ;
end_cmd = 1;
}
if (host->data)
mmc_dma_cleanup(host);
}
if ((status & DATA_TIMEOUT) ||
(status & DATA_CRC)) {
if (host->data) {
if (status & DATA_TIMEOUT)
mmc_dma_cleanup(host);
else
host->data->error = -EILSEQ;
end_trans = 1;
}
}
if (status & CARD_ERR) {
dev_dbg(mmc_dev(host->mmc),
"Ignoring card err CMD%d\n", host->cmd->opcode);
if (host->cmd)
end_cmd = 1;
if (host->data)
end_trans = 1;
}
}
OMAP_HSMMC_WRITE(host->base, STAT, status);
if (end_cmd || (status & CC))
mmc_omap_cmd_done(host, host->cmd);
if (end_trans || (status & TC))
mmc_omap_xfer_done(host, host->data);
return IRQ_HANDLED;
}
/*
* Switch MMC operating voltage
*/
static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd)
{
u32 reg_val = 0;
int ret;
/* Disable the clocks */
clk_disable(host->fclk);
clk_disable(host->iclk);
clk_disable(host->dbclk);
/* Turn the power off */
ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
if (ret != 0)
goto err;
/* Turn the power ON with given VDD 1.8 or 3.0v */
ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1, vdd);
if (ret != 0)
goto err;
clk_enable(host->fclk);
clk_enable(host->iclk);
clk_enable(host->dbclk);
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
reg_val = OMAP_HSMMC_READ(host->base, HCTL);
/*
* If a MMC dual voltage card is detected, the set_ios fn calls
* this fn with VDD bit set for 1.8V. Upon card removal from the
* slot, mmc_omap_detect fn sets the VDD back to 3V.
*/
if (((1 << vdd) == MMC_VDD_32_33) || ((1 << vdd) == MMC_VDD_33_34))
reg_val |= SDVS30;
if ((1 << vdd) == MMC_VDD_165_195)
reg_val |= SDVS18;
OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
return 0;
err:
dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage \n");
return ret;
}
/*
* Work Item to notify the core about card insertion/removal
*/
static void mmc_omap_detect(struct work_struct *work)
{
u16 vdd = 0;
struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
mmc_carddetect_work);
if (host->carddetect) {
if (!(OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET)) {
/*
* Set the VDD back to 3V when the card is removed
* before the set_ios fn turns off the power.
*/
vdd = fls(host->mmc->ocr_avail) - 1;
if (omap_mmc_switch_opcond(host, vdd) != 0)
host->mmc->ios.vdd = vdd;
}
mmc_detect_change(host->mmc, (HZ * 200) / 1000);
} else
mmc_detect_change(host->mmc, (HZ * 50) / 1000);
}
/*
* ISR for handling card insertion and removal
*/
void omap_mmc_notify_card_detect(struct device *dev, int slot, int detected)
{
struct mmc_omap_host *host = dev_get_drvdata(dev);
host->carddetect = detected;
schedule_work(&host->mmc_carddetect_work);
}
/*
* DMA call back function
*/
static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
{
struct mmc_omap_host *host = data;
if (ch_status & OMAP2_DMA_MISALIGNED_ERR_IRQ)
dev_dbg(mmc_dev(host->mmc), "MISALIGNED_ADRS_ERR\n");
if (host->dma_ch < 0)
return;
omap_free_dma(host->dma_ch);
host->dma_ch = -1;
/*
* DMA Callback: run in interrupt context.
* mutex_unlock will through a kernel warning if used.
*/
up(&host->sem);
}
/*
* Configure dma src and destination parameters
*/
static int mmc_omap_config_dma_param(int sync_dir, struct mmc_omap_host *host,
struct mmc_data *data)
{
if (sync_dir == 0) {
omap_set_dma_dest_params(host->dma_ch, 0,
OMAP_DMA_AMODE_CONSTANT,
(host->mapbase + OMAP_HSMMC_DATA), 0, 0);
omap_set_dma_src_params(host->dma_ch, 0,
OMAP_DMA_AMODE_POST_INC,
sg_dma_address(&data->sg[0]), 0, 0);
} else {
omap_set_dma_src_params(host->dma_ch, 0,
OMAP_DMA_AMODE_CONSTANT,
(host->mapbase + OMAP_HSMMC_DATA), 0, 0);
omap_set_dma_dest_params(host->dma_ch, 0,
OMAP_DMA_AMODE_POST_INC,
sg_dma_address(&data->sg[0]), 0, 0);
}
return 0;
}
/*
* Routine to configure and start DMA for the MMC card
*/
static int
mmc_omap_start_dma_transfer(struct mmc_omap_host *host, struct mmc_request *req)
{
int sync_dev, sync_dir = 0;
int dma_ch = 0, ret = 0, err = 1;
struct mmc_data *data = req->data;
/*
* If for some reason the DMA transfer is still active,
* we wait for timeout period and free the dma
*/
if (host->dma_ch != -1) {
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(100);
if (down_trylock(&host->sem)) {
omap_free_dma(host->dma_ch);
host->dma_ch = -1;
up(&host->sem);
return err;
}
} else {
if (down_trylock(&host->sem))
return err;
}
if (!(data->flags & MMC_DATA_WRITE)) {
host->dma_dir = DMA_FROM_DEVICE;
sync_dev = OMAP24XX_DMA_MMC1_RX;
} else {
host->dma_dir = DMA_TO_DEVICE;
sync_dev = OMAP24XX_DMA_MMC1_TX;
}
ret = omap_request_dma(sync_dev, "MMC/SD", mmc_omap_dma_cb,
host, &dma_ch);
if (ret != 0) {
dev_dbg(mmc_dev(host->mmc),
"%s: omap_request_dma() failed with %d\n",
mmc_hostname(host->mmc), ret);
return ret;
}
host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
data->sg_len, host->dma_dir);
host->dma_ch = dma_ch;
if (!(data->flags & MMC_DATA_WRITE))
mmc_omap_config_dma_param(1, host, data);
else
mmc_omap_config_dma_param(0, host, data);
if ((data->blksz % 4) == 0)
omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
(data->blksz / 4), data->blocks, OMAP_DMA_SYNC_FRAME,
sync_dev, sync_dir);
else
/* REVISIT: The MMC buffer increments only when MSB is written.
* Return error for blksz which is non multiple of four.
*/
return -EINVAL;
omap_start_dma(dma_ch);
return 0;
}
/*
* Configure block length for MMC/SD cards and initiate the transfer.
*/
static int
mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
{
int ret;
host->data = req->data;
if (req->data == NULL) {
host->datadir = OMAP_MMC_DATADIR_NONE;
OMAP_HSMMC_WRITE(host->base, BLK, 0);
return 0;
}
OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
| (req->data->blocks << 16));
host->datadir = (req->data->flags & MMC_DATA_WRITE) ?
OMAP_MMC_DATADIR_WRITE : OMAP_MMC_DATADIR_READ;
if (host->use_dma) {
ret = mmc_omap_start_dma_transfer(host, req);
if (ret != 0) {
dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
return ret;
}
}
return 0;
}
/*
* Request function. for read/write operation
*/
static void omap_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
{
struct mmc_omap_host *host = mmc_priv(mmc);
WARN_ON(host->mrq != NULL);
host->mrq = req;
mmc_omap_prepare_data(host, req);
mmc_omap_start_command(host, req->cmd, req->data);
}
/* Routine to configure clock values. Exposed API to core */
static void omap_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct mmc_omap_host *host = mmc_priv(mmc);
u16 dsor = 0;
unsigned long regval;
unsigned long timeout;
switch (ios->power_mode) {
case MMC_POWER_OFF:
mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
break;
case MMC_POWER_UP:
mmc_slot(host).set_power(host->dev, host->slot_id, 1, ios->vdd);
break;
}
switch (mmc->ios.bus_width) {
case MMC_BUS_WIDTH_4:
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
break;
case MMC_BUS_WIDTH_1:
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
break;
}
if (host->id == OMAP_MMC1_DEVID) {
/* Only MMC1 can operate at 3V/1.8V */
if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
(ios->vdd == DUAL_VOLT_OCR_BIT)) {
/*
* The mmc_select_voltage fn of the core does
* not seem to set the power_mode to
* MMC_POWER_UP upon recalculating the voltage.
* vdd 1.8v.
*/
if (omap_mmc_switch_opcond(host, ios->vdd) != 0)
dev_dbg(mmc_dev(host->mmc),
"Switch operation failed\n");
}
}
if (ios->clock) {
dsor = OMAP_MMC_MASTER_CLOCK / ios->clock;
if (dsor < 1)
dsor = 1;
if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock)
dsor++;
if (dsor > 250)
dsor = 250;
}
omap_mmc_stop_clock(host);
regval = OMAP_HSMMC_READ(host->base, SYSCTL);
regval = regval & ~(CLKD_MASK);
regval = regval | (dsor << 6) | (DTO << 16);
OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
OMAP_HSMMC_WRITE(host->base, SYSCTL,
OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
/* Wait till the ICS bit is set */
timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != 0x2
&& time_before(jiffies, timeout))
msleep(1);
OMAP_HSMMC_WRITE(host->base, SYSCTL,
OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
if (ios->power_mode == MMC_POWER_ON)
send_init_stream(host);
if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
OMAP_HSMMC_WRITE(host->base, CON,
OMAP_HSMMC_READ(host->base, CON) | OD);
}
/* NOTE: Read only switch not supported yet */
static struct mmc_host_ops mmc_omap_ops = {
.request = omap_mmc_request,
.set_ios = omap_mmc_set_ios,
};
static int __init omap_mmc_probe(struct platform_device *pdev)
{
struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
struct mmc_host *mmc;
struct mmc_omap_host *host = NULL;
struct resource *res;
int ret = 0, irq;
if (pdata == NULL) {
dev_err(&pdev->dev, "Platform Data is missing\n");
return -ENXIO;
}
if (pdata->nr_slots == 0) {
dev_err(&pdev->dev, "No Slots\n");
return -ENXIO;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
if (res == NULL || irq < 0)
return -ENXIO;
res = request_mem_region(res->start, res->end - res->start + 1,
pdev->name);
if (res == NULL)
return -EBUSY;
mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
if (!mmc) {
ret = -ENOMEM;
goto err;
}
host = mmc_priv(mmc);
host->mmc = mmc;
host->pdata = pdata;
host->use_dma = 1;
host->dma_ch = -1;
host->irq = irq;
host->id = pdev->id;
host->slot_id = pdev->id - 1;
host->mapbase = res->start;
host->base = ioremap(host->mapbase, SZ_4K);
mmc->ops = &mmc_omap_ops;
mmc->f_min = 400000;
mmc->f_max = 52000000;
sema_init(&host->sem, 1);
host->iclk = clk_get(&pdev->dev, "mmchs_ick");
if (IS_ERR(host->iclk)) {
ret = PTR_ERR(host->iclk);
host->iclk = NULL;
goto err;
}
host->fclk = clk_get(&pdev->dev, "mmchs_fck");
if (IS_ERR(host->fclk)) {
ret = PTR_ERR(host->fclk);
host->fclk = NULL;
clk_put(host->iclk);
goto err;
}
if (clk_enable(host->fclk) != 0)
goto err;
if (clk_enable(host->iclk) != 0) {
clk_disable(host->fclk);
clk_put(host->fclk);
goto err;
}
host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
/*
* MMC can still work without debounce clock.
*/
if (IS_ERR(host->dbclk))
dev_dbg(mmc_dev(host->mmc), "Failed to get debounce clock \n");
else
if (clk_enable(host->dbclk) != 0)
dev_dbg(mmc_dev(host->mmc), "Enabling debounce"
"clk failed\n");
else
host->dbclk_enabled = 1;
mmc->ocr_avail = mmc_slot(host).ocr_mask;
mmc->caps |= MMC_CAP_MULTIWRITE | MMC_CAP_MMC_HIGHSPEED |
MMC_CAP_SD_HIGHSPEED;
if (pdata->conf.wire4)
mmc->caps |= MMC_CAP_4_BIT_DATA;
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL) | SDVS30);
OMAP_HSMMC_WRITE(host->base, CAPA, OMAP_HSMMC_READ(host->base,
CAPA) | VS30 | VS18);
/* Set the controller to AUTO IDLE mode */
OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE);
/* Set SD bus power bit */
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
/* Request IRQ for MMC operations */
ret = request_irq(host->irq, mmc_omap_irq, IRQF_DISABLED, pdev->name,
host);
if (ret) {
dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ");
goto irq_err;
}
INIT_WORK(&host->mmc_carddetect_work, mmc_omap_detect);
if (pdata->init != NULL) {
if (pdata->init(&pdev->dev) != 0) {
free_irq(host->irq, host);
goto irq_err;
}
}
OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
platform_set_drvdata(pdev, host);
mmc_add_host(mmc);
return 0;
err:
dev_dbg(mmc_dev(host->mmc), "Probe Failed\n");
if (host)
mmc_free_host(mmc);
return ret;
irq_err:
dev_dbg(mmc_dev(host->mmc), "Unable to configure MMC IRQs");
clk_disable(host->fclk);
clk_disable(host->iclk);
clk_put(host->fclk);
clk_put(host->iclk);
if (host->dbclk_enabled) {
clk_disable(host->dbclk);
clk_put(host->dbclk);
}
if (host)
mmc_free_host(mmc);
return ret;
}
static int omap_mmc_remove(struct platform_device *pdev)
{
struct mmc_omap_host *host = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
if (host) {
host->pdata->cleanup(&pdev->dev);
free_irq(host->irq, host);
flush_scheduled_work();
clk_disable(host->fclk);
clk_disable(host->iclk);
clk_put(host->fclk);
clk_put(host->iclk);
if (host->dbclk_enabled) {
clk_disable(host->dbclk);
clk_put(host->dbclk);
}
mmc_free_host(host->mmc);
}
return 0;
}
#ifdef CONFIG_PM
static int omap_mmc_suspend(struct platform_device *pdev, pm_message_t state)
{
int ret = 0;
struct mmc_omap_host *host = platform_get_drvdata(pdev);
if (host && host->suspended)
return 0;
if (host) {
ret = mmc_suspend_host(host->mmc, state);
if (ret == 0) {
host->suspended = 1;
OMAP_HSMMC_WRITE(host->base, ISE, 0);
OMAP_HSMMC_WRITE(host->base, IE, 0);
ret = host->pdata->suspend(&pdev->dev, host->slot_id);
if (ret)
dev_dbg(mmc_dev(host->mmc),
"Unable to handle MMC board"
"level suspend\n");
if (!(OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET)) {
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL)
& SDVSCLR);
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL)
| SDVS30);
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL)
| SDBP);
}
clk_disable(host->fclk);
clk_disable(host->iclk);
clk_disable(host->dbclk);
}
}
return ret;
}
/* Routine to resume the MMC device */
static int omap_mmc_resume(struct platform_device *pdev)
{
int ret = 0;
struct mmc_omap_host *host = platform_get_drvdata(pdev);
if (host && !host->suspended)
return 0;
if (host) {
ret = clk_enable(host->fclk);
if (ret)
goto clk_en_err;
ret = clk_enable(host->iclk);
if (ret) {
clk_disable(host->fclk);
clk_put(host->fclk);
goto clk_en_err;
}
if (clk_enable(host->dbclk) != 0)
dev_dbg(mmc_dev(host->mmc),
"Enabling debounce clk failed\n");
ret = host->pdata->resume(&pdev->dev, host->slot_id);
if (ret)
dev_dbg(mmc_dev(host->mmc),
"Unmask interrupt failed\n");
/* Notify the core to resume the host */
ret = mmc_resume_host(host->mmc);
if (ret == 0)
host->suspended = 0;
}
return ret;
clk_en_err:
dev_dbg(mmc_dev(host->mmc),
"Failed to enable MMC clocks during resume\n");
return ret;
}
#else
#define omap_mmc_suspend NULL
#define omap_mmc_resume NULL
#endif
static struct platform_driver omap_mmc_driver = {
.probe = omap_mmc_probe,
.remove = omap_mmc_remove,
.suspend = omap_mmc_suspend,
.resume = omap_mmc_resume,
.driver = {
.name = DRIVER_NAME,
},
};
static int __init omap_mmc_init(void)
{
/* Register the MMC driver */
return platform_driver_register(&omap_mmc_driver);
}
static void __exit omap_mmc_cleanup(void)
{
/* Unregister MMC driver */
platform_driver_unregister(&omap_mmc_driver);
}
module_init(omap_mmc_init);
module_exit(omap_mmc_cleanup);
MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS(DRIVER_NAME);
MODULE_AUTHOR("Texas Instruments Inc");
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