Message-ID: <0F1B54C89D5F954D8535DB252AF412FA03E3E07F@chinexm1.ad.analog.com>
Date:	Wed, 15 Apr 2009 20:42:44 +0800
From:	"Cai, Cliff" <Cliff.Cai@...log.com>
To:	<cliffcai.sh@...il.com>, <drzeus-mmc@...eus.cx>
CC:	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] [mmc/host]:Blackfin SDH Controller Driver

Sorry ,missed Kconfig and Makefile changes,I will send it again

Cliff 

>-----Original Message-----
>From: cliffcai.sh@...il.com [mailto:cliffcai.sh@...il.com] 
>Sent: Thursday, April 16, 2009 3:25 AM
>To: drzeus-mmc@...eus.cx
>Cc: linux-kernel@...r.kernel.org; Cai, Cliff; Cliff Cai
>Subject: [PATCH] [mmc/host]:Blackfin SDH Controller Driver
>
>From: Cliff Cai <cliffcai.sh@...il.com>
>
>Signed-off-by: Cliff Cai <cliffcai.sh@...il.com>
>---
> drivers/mmc/host/bfin_sdh.c |  648 
>+++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 648 insertions(+), 0 deletions(-)  create 
>mode 100644 drivers/mmc/host/bfin_sdh.c
>
>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");
>--
>1.6.2
>
>
--
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