Re: [PATCH] [mmc/host]:Blackfin SD Host Controller Driver

[Jaswinder Singh Rajput]

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On Thu, 2009-04-16 at 17:32 +0800, cliffcai.sh@xxxxxxxxx wrote:
> From: Cliff Cai <cliffcai.sh@xxxxxxxxx>
> 
> Signed-off-by: Cliff Cai <cliffcai.sh@xxxxxxxxx>
> ---
>  drivers/mmc/host/Kconfig    |   18 ++
>  drivers/mmc/host/Makefile   |    2 +-
>  drivers/mmc/host/bfin_sdh.c |  648 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 667 insertions(+), 1 deletions(-)
>  create mode 100644 drivers/mmc/host/bfin_sdh.c
> 
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index d00a35d..588813f 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -242,3 +242,21 @@ config MMC_TMIO
>  	  This provides support for the SD/MMC cell found in TC6393XB,
>  	  T7L66XB and also ipaq ASIC3
>  
> +config SDH_BFIN
> +	tristate "Blackfin Secure Digital Host support"
> +	depends on MMC && ((BF54x && !BF544) || (BF51x && !BF512))
> +	help
> +	  If you say yes here you will get support for the Blackfin on-chip
> +	  Secure Digital Host interface.  This includes support for MMC and
> +	  SD cards.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called bfin_sdh.
> +
> +	  If unsure, say N.
> +
> +config SDH_BFIN_MISSING_CMD_PULLUP_WORKAROUND
> +	bool "Blackfin EZkit Missing SDH_CMD Pull Up Resistor Workaround"
> +	depends on SDH_BFIN
> +	help
> +	  If you say yes here SD-Cards may work on the EZkit.
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 970a997..0af1f7a 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -29,4 +29,4 @@ endif
>  obj-$(CONFIG_MMC_S3C)   	+= s3cmci.o
>  obj-$(CONFIG_MMC_SDRICOH_CS)	+= sdricoh_cs.o
>  obj-$(CONFIG_MMC_TMIO)		+= tmio_mmc.o
> -
> +obj-$(CONFIG_SDH_BFIN)		+= bfin_sdh.o
> diff --git a/drivers/mmc/host/bfin_sdh.c b/drivers/mmc/host/bfin_sdh.c
> new file mode 100644
> index 0000000..c22f326
> --- /dev/null
> +++ b/drivers/mmc/host/bfin_sdh.c
> @@ -0,0 +1,648 @@
> +/*
> + *  linux/drivers/mmc/bfin_sdh.c - Blackfin SDH Controller Driver
> + *
> + *  Copyright (C) 2007 Analog Device Inc.
> + *
> + * 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.
> + *
> + */
> +/* In term of ADSP_BF5xx_Blackfin_Processor_Peripheral_Hardware_Reference,
> + * the SDH allows software to detect a card when it is inserted into its slot.
> + * The SD_DATA3 pin powers up low due to a special pull-down resistor. When an
> + * SD Card is inserted in its slot, the resistance increases and a rising edge
> + * is detected by the SDH module.
> + * But this doesn't work sometimes. When a MMC/SD card is inserted, the voltage
> + * doesn't rise on SD_DATA3. In term of The MultiMediaCard System Specification,
> + * SD_DATA3 is used as CS pin in SPI mode. The MultiMediaCard wakes up in the
> + * MultiMediaCard mode. During the scan procedure, host will send CMD0 to reset
> + * MMC card, if CS pin is low, MMC card will enter SPI mode. Of course Secure
> + * Digital Host controller is not a SPI controller. So the Card detect function
> + * has to be disabled. After card is inserted run "echo 0 > /proc/driver/sdh"
> + * to trigger card scanning */
> +
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/ioport.h>
> +#include <linux/platform_device.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/mmc/host.h>
> +#include <linux/proc_fs.h>
> +
> +#include <asm/cacheflush.h>
> +#include <asm/dma.h>
> +#include <asm/portmux.h>
> +#include <asm/bfin_sdh.h>
> +
> +#define DRIVER_NAME	"bfin-sdh"
> +
> +#define NR_SG	32
> +
> +#if defined(CONFIG_BF51x)
> +#define bfin_write_SDH_PWR_CTL		bfin_write_RSI_PWR_CTL
> +#define bfin_read_SDH_CLK_CTL		bfin_read_RSI_CLK_CTL
> +#define bfin_write_SDH_CLK_CTL		bfin_write_RSI_CLK_CTL
> +#define bfin_write_SDH_ARGUMENT		bfin_write_RSI_ARGUMENT
> +#define bfin_write_SDH_COMMAND		bfin_write_RSI_COMMAND
> +#define bfin_write_SDH_DATA_TIMER	bfin_write_RSI_DATA_TIMER
> +#define bfin_read_SDH_RESPONSE0		bfin_read_RSI_RESPONSE0
> +#define bfin_read_SDH_RESPONSE1		bfin_read_RSI_RESPONSE1
> +#define bfin_read_SDH_RESPONSE2		bfin_read_RSI_RESPONSE2
> +#define bfin_read_SDH_RESPONSE3		bfin_read_RSI_RESPONSE3
> +#define bfin_write_SDH_DATA_LGTH	bfin_write_RSI_DATA_LGTH
> +#define bfin_read_SDH_DATA_CTL		bfin_read_RSI_DATA_CTL
> +#define bfin_write_SDH_DATA_CTL		bfin_write_RSI_DATA_CTL
> +#define bfin_read_SDH_DATA_CNT		bfin_read_RSI_DATA_CNT
> +#define bfin_write_SDH_STATUS_CLR	bfin_write_RSI_STATUS_CLR
> +#define bfin_read_SDH_E_STATUS		bfin_read_RSI_E_STATUS
> +#define bfin_write_SDH_E_STATUS		bfin_write_RSI_E_STATUS
> +#define bfin_read_SDH_STATUS		bfin_read_RSI_STATUS
> +#define bfin_write_SDH_MASK0		bfin_write_RSI_MASK0
> +#define bfin_read_SDH_CFG		bfin_read_RSI_CFG
> +#define bfin_write_SDH_CFG		bfin_write_RSI_CFG
> +#endif
> +
> +struct dma_desc_array {
> +	unsigned long	start_addr;
> +	unsigned short	cfg;
> +	unsigned short	x_count;
> +	short		x_modify;
> +} __attribute__((packed));
> +
> +struct sdh_host {
> +	struct mmc_host		*mmc;
> +	spinlock_t		lock; /* Why I have to give a comment here? */
> +	struct resource		*res;
> +	void __iomem		*base;
> +	int			irq;
> +	int			stat_irq;
> +	int			dma_ch;
> +	int			dma_dir;
> +	struct dma_desc_array	*sg_cpu;
> +	dma_addr_t		sg_dma;
> +	int			dma_len;
> +
> +	unsigned int		imask;
> +	unsigned int		power_mode;
> +	unsigned int		clk_div;
> +
> +	struct mmc_request	*mrq;
> +	struct mmc_command	*cmd;
> +	struct mmc_data		*data;
> +};
> +
> +static struct bfin_sd_host *get_sdh_data(struct platform_device *pdev)
> +{
> +	return pdev->dev.platform_data;
> +}
> +
> +static void sdh_stop_clock(struct sdh_host *host)
> +{
> +	bfin_write_SDH_CLK_CTL(bfin_read_SDH_CLK_CTL() & ~CLK_E);
> +	SSYNC();
> +}
> +
> +static void sdh_enable_stat_irq(struct sdh_host *host, unsigned int mask)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&host->lock, flags);
> +	host->imask |= mask;
> +	bfin_write_SDH_MASK0(mask);
> +	SSYNC();
> +	spin_unlock_irqrestore(&host->lock, flags);
> +}
> +
> +static void sdh_disable_stat_irq(struct sdh_host *host, unsigned int mask)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&host->lock, flags);
> +	host->imask &= ~mask;
> +	bfin_write_SDH_MASK0(host->imask);
> +	SSYNC();
> +	spin_unlock_irqrestore(&host->lock, flags);
> +}
> +
> +static void sdh_setup_data(struct sdh_host *host, struct mmc_data *data)
> +{
> +	unsigned int length;
> +	unsigned int data_ctl;
> +	unsigned int dma_cfg;
> +#if defined(CONFIG_BF54x)
> +	int i;
> +#endif
> +	pr_debug("%s enter flags:0x%x\n", __func__, data->flags);
> +	host->data = data;
> +	data_ctl = 0;
> +	dma_cfg = 0;
> +
> +	length = data->blksz * data->blocks;
> +	bfin_write_SDH_DATA_LGTH(length);
> +
> +	if (data->flags & MMC_DATA_STREAM)
> +		data_ctl |= DTX_MODE;
> +
> +	if (data->flags & MMC_DATA_READ)
> +		data_ctl |= DTX_DIR;
> +
> +	BUG_ON(data->blksz & (data->blksz -1));
> +	data_ctl |= ((ffs(data->blksz) -1) << 4);
> +
> +	bfin_write_SDH_DATA_CTL(data_ctl);
> +
> +	bfin_write_SDH_DATA_TIMER(0xFFFFF);
> +	SSYNC();
> +
> +	if (data->flags & MMC_DATA_READ) {
> +		host->dma_dir = DMA_FROM_DEVICE;
> +		dma_cfg |= WNR;
> +	} else
> +		host->dma_dir = DMA_TO_DEVICE;
> +
> +	sdh_enable_stat_irq(host, (DAT_CRC_FAIL | DAT_TIME_OUT | DAT_END));
> +	host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len, host->dma_dir);
> +#if defined(CONFIG_BF54x)
> +	dma_cfg |= DMAFLOW_ARRAY | NDSIZE_5 | RESTART | WDSIZE_32 | DMAEN;
> +	for (i = 0; i < host->dma_len; i++) {
> +		host->sg_cpu[i].start_addr = sg_dma_address(&data->sg[i]);
> +		host->sg_cpu[i].cfg = dma_cfg;
> +		host->sg_cpu[i].x_count = sg_dma_len(&data->sg[i]) / 4;
> +		host->sg_cpu[i].x_modify = 4;
> +		pr_debug("%d: start_addr:0x%lx, cfg:0x%x, x_count:0x%x, x_modify:0x%x\n",
> +				i, host->sg_cpu[i].start_addr, host->sg_cpu[i].cfg,
> +				host->sg_cpu[i].x_count, host->sg_cpu[i].x_modify);
> +	}
> +	flush_dcache_range((unsigned int)host->sg_cpu, \
> +			(unsigned int)host->sg_cpu + \
> +			host->dma_len * sizeof(struct dma_desc_array));
> +	/* Set the last descriptor to stop mode */
> +	host->sg_cpu[host->dma_len - 1].cfg &= ~(DMAFLOW | NDSIZE);
> +	host->sg_cpu[host->dma_len - 1].cfg |= DI_EN;
> +
> +	set_dma_curr_desc_addr(host->dma_ch, (unsigned long *)host->sg_dma);
> +	set_dma_x_count(host->dma_ch, 0);
> +	set_dma_x_modify(host->dma_ch, 0);
> +	set_dma_config(host->dma_ch, dma_cfg);
> +	
> +/* RSI DMA doesn't work in array mode */
> +#elif defined(CONFIG_BF51x)
> +	dma_cfg |= WDSIZE_32 | DMAEN;
> +	set_dma_start_addr(host->dma_ch, sg_dma_address(&data->sg[0]));
> +	set_dma_x_count(host->dma_ch, length / 4);
> +	set_dma_x_modify(host->dma_ch, 4);
> +	set_dma_config(host->dma_ch, dma_cfg);
> +#endif
> +	bfin_write_SDH_DATA_CTL(bfin_read_SDH_DATA_CTL() | DTX_DMA_E | DTX_E);
> +
> +	SSYNC();
> +
> +	pr_debug("%s exit\n", __func__);
> +}
> +
> +static void sdh_start_cmd(struct sdh_host *host, struct mmc_command *cmd)
> +{
> +	unsigned int sdh_cmd;
> +	unsigned int stat_mask;
> +
> +	pr_debug("%s enter cmd:0x%p\n", __func__, cmd);
> +	WARN_ON(host->cmd != NULL);
> +	host->cmd = cmd;
> +
> +	sdh_cmd = 0;
> +	stat_mask = 0;
> +
> +	sdh_cmd |= cmd->opcode;
> +
> +	if (cmd->flags & MMC_RSP_PRESENT) {
> +		sdh_cmd |= CMD_RSP;
> +		stat_mask |= CMD_RESP_END;
> +	} else
> +		stat_mask |= CMD_SENT;
> +
> +	if (cmd->flags & MMC_RSP_136)
> +		sdh_cmd |= CMD_L_RSP;
> +
> +	stat_mask |= CMD_CRC_FAIL | CMD_TIME_OUT;
> +
> +	sdh_enable_stat_irq(host, stat_mask);
> +
> +	bfin_write_SDH_ARGUMENT(cmd->arg);
> +	bfin_write_SDH_COMMAND(sdh_cmd | CMD_E);
> +	bfin_write_SDH_CLK_CTL(bfin_read_SDH_CLK_CTL() | CLK_E);
> +	SSYNC();
> +}
> +
> +static void sdh_finish_request(struct sdh_host *host, struct mmc_request *mrq)
> +{
> +	pr_debug("%s enter\n", __func__);
> +	host->mrq = NULL;
> +	host->cmd = NULL;
> +	host->data = NULL;
> +	mmc_request_done(host->mmc, mrq);
> +}
> +
> +static int sdh_cmd_done(struct sdh_host *host, unsigned int stat)
> +{
> +	struct mmc_command *cmd = host->cmd;
> +
> +	pr_debug("%s enter cmd:%p\n", __func__, cmd);
> +	if (!cmd)
> +		return 0;
> +
> +	host->cmd = NULL;
> +
> +	if (cmd->flags & MMC_RSP_PRESENT) {
> +		cmd->resp[0] = bfin_read_SDH_RESPONSE0();
> +		if (cmd->flags & MMC_RSP_136) {
> +			cmd->resp[1] = bfin_read_SDH_RESPONSE1();
> +			cmd->resp[2] = bfin_read_SDH_RESPONSE2();
> +			cmd->resp[3] = bfin_read_SDH_RESPONSE3();
> +		}
> +	}
> +	if (stat & CMD_TIME_OUT)
> +		cmd->error = -ETIMEDOUT;
> +	else if (stat & CMD_CRC_FAIL && cmd->flags & MMC_RSP_CRC)
> +		cmd->error = -EILSEQ;
> +
> +	sdh_disable_stat_irq(host, (CMD_SENT | CMD_RESP_END | CMD_TIME_OUT | CMD_CRC_FAIL));
> +
> +	if (host->data && !cmd->error) {
> +		if (host->data->flags & MMC_DATA_WRITE)
> +			sdh_setup_data(host, host->data);
> +
> +		sdh_enable_stat_irq(host, DAT_END | RX_OVERRUN | TX_UNDERRUN | DAT_TIME_OUT);
> +	} else
> +		sdh_finish_request(host, host->mrq);
> +
> +	return 1;
> +}
> +
> +static int sdh_data_done(struct sdh_host *host, unsigned int stat)
> +{
> +	struct mmc_data *data = host->data;
> +
> +	pr_debug("%s enter stat:0x%x\n", __func__, stat);
> +	if (!data)
> +		return 0;
> +
> +	disable_dma(host->dma_ch);
> +	dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
> +		     host->dma_dir);
> +
> +	if (stat & DAT_TIME_OUT)
> +		data->error = -ETIMEDOUT;
> +	else if (stat & DAT_CRC_FAIL)
> +		data->error = -EILSEQ;
> +	else if (stat & (RX_OVERRUN | TX_UNDERRUN))
> +		data->error = -EIO;
> +
> +	if (!data->error)
> +		data->bytes_xfered = data->blocks * data->blksz;
> +	else
> +		data->bytes_xfered = data->blocks * data->blksz - \
> +				     bfin_read_SDH_DATA_CNT();
> +
> +	sdh_disable_stat_irq(host, DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN | TX_UNDERRUN);
> +	bfin_write_SDH_STATUS_CLR(DAT_END_STAT | DAT_TIMEOUT_STAT | \
> +			DAT_CRC_FAIL_STAT | DAT_BLK_END_STAT | RX_OVERRUN | TX_UNDERRUN);
> +	bfin_write_SDH_DATA_CTL(0);
> +	SSYNC();
> +
> +	host->data = NULL;
> +	if (host->mrq->stop) {
> +		sdh_stop_clock(host);
> +		sdh_start_cmd(host, host->mrq->stop);
> +	} else
> +		sdh_finish_request(host, host->mrq);
> +
> +	return 1;
> +}
> +
> +static void sdh_request(struct mmc_host *mmc, struct mmc_request *mrq)
> +{
> +	struct sdh_host *host = mmc_priv(mmc);
> +
> +	pr_debug("%s enter, mrp:%p, cmd:%p\n", __func__, mrq, mrq->cmd);
> +	WARN_ON(host->mrq != NULL);
> +
> +	host->mrq = mrq;
> +	host->data = mrq->data;
> +
> +	if (mrq->data && mrq->data->flags & MMC_DATA_READ)
> +		sdh_setup_data(host, mrq->data);
> +
> +	sdh_start_cmd(host, mrq->cmd);
> +}
> +
> +static int sdh_get_ro(struct mmc_host *mmc)
> +{
> +	/* Host doesn't support read only detection so assume writeable */
> +	return -ENOSYS;
> +}
> +
> +static void sdh_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> +{
> +	struct sdh_host *host;
> +	unsigned long flags;
> +	u16 clk_ctl = 0;
> +	u16 pwr_ctl = 0;
> +	u16 cfg;
> +	host = mmc_priv(mmc);
> +
> +	spin_lock_irqsave(&host->lock, flags);
> +	if (ios->clock) {
> +		unsigned long clk_div;
> +		unsigned long sys_clk;
> +		sys_clk = get_sclk();
> +		if (sys_clk % (2*ios->clock) == 0)
> +			clk_div = sys_clk / (2*ios->clock) - 1;
> +		else
> +			clk_div = sys_clk / (2*ios->clock);
> +		if (clk_div > 0xff)
> +			clk_div = 0xFF;
> +		clk_ctl |= clk_div & 0xFF;
> +		clk_ctl |= CLK_E;
> +		host->clk_div = clk_div;
> +	} else
> +		sdh_stop_clock(host);
> +
> +	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
> +#ifdef CONFIG_SDH_BFIN_MISSING_CMD_PULLUP_WORKAROUND
> +		pwr_ctl |= ROD_CTL;
> +#else
> +		pwr_ctl |= SD_CMD_OD | ROD_CTL;
> +#endif
> +
> +	if (ios->bus_width == MMC_BUS_WIDTH_4) {
> +		cfg = bfin_read_SDH_CFG();
> +		cfg &= ~0x80;
> +		cfg |= 0x40;
> +		/* Enable 4 bit SDIO */
> +		cfg |= 0x0c;
> +		bfin_write_SDH_CFG(cfg);
> +		clk_ctl |= WIDE_BUS;
> +	} else {
> +		cfg = bfin_read_SDH_CFG();
> +		cfg |= 0x08;
> +		bfin_write_SDH_CFG(cfg);
> +	}
> +
> +	bfin_write_SDH_CLK_CTL(clk_ctl);
> +
> +	host->power_mode = ios->power_mode;
> +	if (ios->power_mode == MMC_POWER_ON)
> +		pwr_ctl |= PWR_ON;
> +
> +	bfin_write_SDH_PWR_CTL(pwr_ctl);
> +	SSYNC();
> +
> +	spin_unlock_irqrestore(&host->lock, flags);
> +
> +	pr_debug("SDH: clk_div = 0x%x actual clock:%ld expected clock:%d\n",
> +			host->clk_div, host->clk_div?get_sclk()/(2 * (host->clk_div + 1)):0,
> +			ios->clock);
> +}
> +
> +static const struct mmc_host_ops sdh_ops = {
> +	.request	= sdh_request,
> +	.get_ro		= sdh_get_ro,
> +	.set_ios	= sdh_set_ios,
> +};
> +
> +static irqreturn_t sdh_dma_irq(int irq, void *devid)
> +{
> +	struct sdh_host *host = devid;
> +
> +	pr_debug("%s enter, irq_stat:0x%04x\n", __func__,\
> +			get_dma_curr_irqstat(host->dma_ch));
> +	clear_dma_irqstat(host->dma_ch);
> +	SSYNC();
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t sdh_stat_irq(int irq, void *devid)
> +{
> +	struct sdh_host *host = devid;
> +	unsigned int status;
> +	int handled = 0;
> +
> +	pr_debug("%s enter\n", __func__);
> +	status = bfin_read_SDH_E_STATUS();
> +	if (status & SD_CARD_DET) {
> +		mmc_detect_change(host->mmc, 0);
> +		bfin_write_SDH_E_STATUS(SD_CARD_DET);
> +	}
> +
> +	status = bfin_read_SDH_STATUS();
> +	if (status & (CMD_SENT | CMD_RESP_END | CMD_TIME_OUT | CMD_CRC_FAIL)) {
> +		handled |= sdh_cmd_done(host, status);
> +		bfin_write_SDH_STATUS_CLR( CMD_SENT_STAT | CMD_RESP_END_STAT | \
> +				CMD_TIMEOUT_STAT | CMD_CRC_FAIL_STAT);
> +		SSYNC();
> +	}
> +
> +	status = bfin_read_SDH_STATUS();
> +	if (status & (DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN | TX_UNDERRUN))
> +		handled |= sdh_data_done(host, status);
> +
> +	pr_debug("%s exit\n\n", __func__);
> +
> +	return IRQ_RETVAL(handled);
> +}
> +
> +static int proc_write(struct file *file, const char __user *buffer,
> +		unsigned long count, void *data)
> +{
> +	struct sdh_host *host = data;
> +	unsigned long cmd = simple_strtoul(buffer, NULL, 16);
> +
> +	switch (cmd) {
> +	case 0:
> +		mmc_detect_change(host->mmc, 0);
> +		break;
> +	default:
> +		printk(KERN_ERR "bfin_sdh: cmd %lu not support\n", cmd);
> +		break;
> +	}
> +
> +	return count;
> +}
> +
> +static int __devinit sdh_probe(struct platform_device *pdev)
> +{
> +	struct mmc_host *mmc;
> +	struct sdh_host *host = NULL;
> +	struct proc_dir_entry *sd_entry;
> +	struct bfin_sd_host *drv_data = get_sdh_data(pdev);
> +	int ret;
> +
> +	if (!drv_data) {
> +		dev_err(&pdev->dev, "missing platform driver data\n");
> +		ret = -EINVAL;
> +		goto out;
> +	}
> +
> +	mmc = mmc_alloc_host(sizeof(struct sdh_host), &pdev->dev);
> +	if (!mmc) {
> +		ret = -ENOMEM;
> +		goto out;
> +	}
> +
> +	mmc->ops = &sdh_ops;
> +	mmc->max_phys_segs = NR_SG;
> +	mmc->max_seg_size = 1 << 16;
> +	mmc->max_blk_size = 2 << 11;
> +	mmc->max_blk_count = 2 << 16;
> +	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
> +	mmc->f_min = get_sclk() >> 9;
> +	mmc->f_max = get_sclk();
> +	mmc->caps = MMC_CAP_4_BIT_DATA;
> +	host = mmc_priv(mmc);
> +	host->mmc = mmc;
> +
> +	spin_lock_init(&host->lock);
> +	host->irq = drv_data->irq_int0;
> +	host->dma_ch = drv_data->dma_chan;
> +	ret = request_irq(host->irq, sdh_stat_irq, 0, "SDH Status IRQ", host);
> +	if (ret) {
> +		dev_err(&pdev->dev, "unable to request status irq\n");
> +		goto out1;
> +	}
> +
> +	ret = request_dma(host->dma_ch, DRIVER_NAME "DMA");
> +	if (ret) {
> +		dev_err(&pdev->dev, "unable to request DMA channel\n");
> +		goto out2;
> +	}
> +
> +	ret = set_dma_callback(host->dma_ch, sdh_dma_irq, host);
> +	if (ret) {
> +		dev_err(&pdev->dev, "unable to request DMA irq\n");
> +		goto out3;
> +	}
> +
> +	host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
> +	if (host->sg_cpu == NULL) {
> +		ret = -ENOMEM;
> +		goto out3;
> +	}
> +
> +	platform_set_drvdata(pdev, mmc);
> +	mmc_add_host(mmc);
> +	ret = peripheral_request_list(drv_data->pin_req, DRIVER_NAME);
> +	if (ret) {
> +		dev_err(&pdev->dev, "unable to request peripheral pins\n");
> +		goto out3;
> +	}
> +
> +#if defined(CONFIG_BF54x)
> +	/* Secure Digital Host shares DMA with Nand controller */
> +	bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1);
> +#endif
> +
> +	bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN);
> +	SSYNC();
> +
> +	/* Disable card inserting detection pin.It's not that useful,since
> +	 * we can't detect removal,and it will affect card detection on BF51x.
> +	 */
> +	bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | 0x60);
> +	SSYNC();
> +	sd_entry = create_proc_entry("driver/sdh", 0600, NULL);
> +	sd_entry->read_proc = NULL;
> +	sd_entry->write_proc = proc_write;
> +	sd_entry->data = host;
> +
> +	return 0;
> +
> +out3:
> +	free_dma(host->dma_ch);
> +out2:
> +	free_irq(host->irq, host);
> +out1:
> +	mmc_free_host(mmc);
> + out:
> +	return ret;
> +}
> +
> +static int __devexit sdh_remove(struct platform_device *pdev)
> +{
> +	struct mmc_host *mmc = platform_get_drvdata(pdev);
> +
> +	platform_set_drvdata(pdev, NULL);
> +
> +	if (mmc) {
> +		struct sdh_host *host = mmc_priv(mmc);
> +
> +		mmc_remove_host(mmc);
> +
> +		sdh_stop_clock(host);
> +		free_irq(host->irq, host);
> +		free_dma(host->dma_ch);
> +		dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
> +
> +		mmc_free_host(mmc);
> +	}
> +	remove_proc_entry("driver/sdh", NULL);
> +
> +	return 0;
> +}
> +
> +#ifdef CONFIG_PM
> +static int sdh_suspend(struct platform_device *dev, pm_message_t state)
> +{
> +	struct mmc_host *mmc = platform_get_drvdata(dev);
> +	int ret = 0;
> +
> +	if (mmc)
> +		ret = mmc_suspend_host(mmc, state);
> +
> +	return ret;
> +}
> +
> +static int sdh_resume(struct platform_device *dev)
> +{
> +	struct mmc_host *mmc = platform_get_drvdata(dev);
> +	int ret = 0;
> +
> +	if (mmc)
> +		ret = mmc_resume_host(mmc);
> +
> +	return ret;
> +}
> +#else
> +#define sdh_suspend	NULL
> +#define sdh_resume	NULL
> +#endif
> +
> +static struct platform_driver sdh_driver = {
> +	.probe		= sdh_probe,
> +	.remove		= sdh_remove,
> +	.suspend	= sdh_suspend,
> +	.resume		= sdh_resume,
> +	.driver		= {
> +		.name	= DRIVER_NAME,
> +	},
> +};
> +
> +static int __init sdh_init(void)
> +{
> +	return platform_driver_register(&sdh_driver);
> +}
> +
> +static void __exit sdh_exit(void)
> +{
> +	platform_driver_unregister(&sdh_driver);
> +}
> +
> +module_init(sdh_init);
> +module_exit(sdh_exit);
> +
> +MODULE_DESCRIPTION("Blackfin Secure Digital Host Driver");
> +MODULE_AUTHOR("Cliff Cai, Roy Huang");
> +MODULE_LICENSE("GPL");

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