RE: [PATCH] [mmc/host]:Blackfin SD Host Controller Driver
From: Cai, Cliff
Date: Thu Apr 16 2009 - 05:07:34 EST
Yes, should I resend this patch to Pierre with new email address?
Thanks
Cliff
>-----Original Message-----
>From: Jaswinder Singh Rajput [mailto:jaswinder@xxxxxxxxxx]
>Sent: Thursday, April 16, 2009 4:56 PM
>To: cliffcai.sh@xxxxxxxxx
>Cc: drzeus-mmc@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Cai,
>Cliff; pierre@xxxxxxxxx; David Brownell
>Subject: Re: [PATCH] [mmc/host]:Blackfin SD Host Controller Driver
>
>It seems you are mailing to old email address, please check
>latest MAINTAINERS. CC updated email address.
>
>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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