text: /*
   *  linux/drivers/mmc/host/pxa.c - PXA MMCI driver
   *
   *  Copyright (C) 2003 Russell King, All Rights Reserved.
   *
   * 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.
   *
   *  This hardware is really sick:
   *   - No way to clear interrupts.
   *   - Have to turn off the clock whenever we touch the device.
   *   - Doesn't tell you how many data blocks were transferred.
   *  Yuck!
   *
   *	1 and 3 byte data transfers not supported
   *	max block length up to 1023
   */
  #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/clk.h>
  #include <linux/err.h>
  #include <linux/mmc/host.h>
  #include <linux/io.h>
  #include <linux/regulator/consumer.h>
  #include <linux/gpio.h>
  
  #include <asm/sizes.h>
  
  #include <mach/hardware.h>
  #include <mach/dma.h>
  #include <mach/mmc.h>
  
  #include "pxamci.h"
  
  #define DRIVER_NAME	"pxa2xx-mci"
  
  #define NR_SG	1
  #define CLKRT_OFF	(~0)
  
  #define mmc_has_26MHz()		(cpu_is_pxa300() || cpu_is_pxa310() \
  				|| cpu_is_pxa935())
  
  struct pxamci_host {
  	struct mmc_host		*mmc;
  	spinlock_t		lock;
  	struct resource		*res;
  	void __iomem		*base;
  	struct clk		*clk;
  	unsigned long		clkrate;
  	int			irq;
  	int			dma;
  	unsigned int		clkrt;
  	unsigned int		cmdat;
  	unsigned int		imask;
  	unsigned int		power_mode;
  	struct pxamci_platform_data *pdata;
  
  	struct mmc_request	*mrq;
  	struct mmc_command	*cmd;
  	struct mmc_data		*data;
  
  	dma_addr_t		sg_dma;
  	struct pxa_dma_desc	*sg_cpu;
  	unsigned int		dma_len;
  
  	unsigned int		dma_dir;
  	unsigned int		dma_drcmrrx;
  	unsigned int		dma_drcmrtx;
  
  	struct regulator	*vcc;
  };
  
  static inline void pxamci_init_ocr(struct pxamci_host *host)
  {
  #ifdef CONFIG_REGULATOR
  	host->vcc = regulator_get(mmc_dev(host->mmc), "vmmc");
  
  	if (IS_ERR(host->vcc))
  		host->vcc = NULL;
  	else {
  		host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc);
  		if (host->pdata && host->pdata->ocr_mask)
  			dev_warn(mmc_dev(host->mmc),
  				"ocr_mask/setpower will not be used\n");
  	}
  #endif
  	if (host->vcc == NULL) {
  		/* fall-back to platform data */
  		host->mmc->ocr_avail = host->pdata ?
  			host->pdata->ocr_mask :
  			MMC_VDD_32_33 | MMC_VDD_33_34;
  	}
  }
  
  static inline int pxamci_set_power(struct pxamci_host *host,
  				    unsigned char power_mode,
  				    unsigned int vdd)
  {
  	int on;
  
  	if (host->vcc) {
  		int ret;
  
  		if (power_mode == MMC_POWER_UP) {
  			ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
  			if (ret)
  				return ret;
  		} else if (power_mode == MMC_POWER_OFF) {
  			ret = mmc_regulator_set_ocr(host->mmc, host->vcc, 0);
  			if (ret)
  				return ret;
  		}
  	}
  	if (!host->vcc && host->pdata &&
  	    gpio_is_valid(host->pdata->gpio_power)) {
  		on = ((1 << vdd) & host->pdata->ocr_mask);
  		gpio_set_value(host->pdata->gpio_power,
  			       !!on ^ host->pdata->gpio_power_invert);
  	}
  	if (!host->vcc && host->pdata && host->pdata->setpower)
  		host->pdata->setpower(mmc_dev(host->mmc), vdd);
  
  	return 0;
  }
  
  static void pxamci_stop_clock(struct pxamci_host *host)
  {
  	if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
  		unsigned long timeout = 10000;
  		unsigned int v;
  
  		writel(STOP_CLOCK, host->base + MMC_STRPCL);
  
  		do {
  			v = readl(host->base + MMC_STAT);
  			if (!(v & STAT_CLK_EN))
  				break;
  			udelay(1);
  		} while (timeout--);
  
  		if (v & STAT_CLK_EN)
  			dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
  	}
  }
  
  static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&host->lock, flags);
  	host->imask &= ~mask;
  	writel(host->imask, host->base + MMC_I_MASK);
  	spin_unlock_irqrestore(&host->lock, flags);
  }
  
  static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&host->lock, flags);
  	host->imask |= mask;
  	writel(host->imask, host->base + MMC_I_MASK);
  	spin_unlock_irqrestore(&host->lock, flags);
  }
  
  static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
  {
  	unsigned int nob = data->blocks;
  	unsigned long long clks;
  	unsigned int timeout;
  	bool dalgn = 0;
  	u32 dcmd;
  	int i;
  
  	host->data = data;
  
  	if (data->flags & MMC_DATA_STREAM)
  		nob = 0xffff;
  
  	writel(nob, host->base + MMC_NOB);
  	writel(data->blksz, host->base + MMC_BLKLEN);
  
  	clks = (unsigned long long)data->timeout_ns * host->clkrate;
  	do_div(clks, 1000000000UL);
  	timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
  	writel((timeout + 255) / 256, host->base + MMC_RDTO);
  
  	if (data->flags & MMC_DATA_READ) {
  		host->dma_dir = DMA_FROM_DEVICE;
  		dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC;
  		DRCMR(host->dma_drcmrtx) = 0;
  		DRCMR(host->dma_drcmrrx) = host->dma | DRCMR_MAPVLD;
  	} else {
  		host->dma_dir = DMA_TO_DEVICE;
  		dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
  		DRCMR(host->dma_drcmrrx) = 0;
  		DRCMR(host->dma_drcmrtx) = host->dma | DRCMR_MAPVLD;
  	}
  
  	dcmd |= DCMD_BURST32 | DCMD_WIDTH1;
  
  	host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
  				   host->dma_dir);
  
  	for (i = 0; i < host->dma_len; i++) {
  		unsigned int length = sg_dma_len(&data->sg[i]);
  		host->sg_cpu[i].dcmd = dcmd | length;
  		if (length & 31 && !(data->flags & MMC_DATA_READ))
  			host->sg_cpu[i].dcmd |= DCMD_ENDIRQEN;
  		/* Not aligned to 8-byte boundary? */
  		if (sg_dma_address(&data->sg[i]) & 0x7)
  			dalgn = 1;
  		if (data->flags & MMC_DATA_READ) {
  			host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
  			host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
  		} else {
  			host->sg_cpu[i].dsadr = sg_dma_address(&data->sg[i]);
  			host->sg_cpu[i].dtadr = host->res->start + MMC_TXFIFO;
  		}
  		host->sg_cpu[i].ddadr = host->sg_dma + (i + 1) *
  					sizeof(struct pxa_dma_desc);
  	}
  	host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP;
  	wmb();
  
  	/*
  	 * The PXA27x DMA controller encounters overhead when working with
  	 * unaligned (to 8-byte boundaries) data, so switch on byte alignment
  	 * mode only if we have unaligned data.
  	 */
  	if (dalgn)
  		DALGN |= (1 << host->dma);
  	else
  		DALGN &= ~(1 << host->dma);
  	DDADR(host->dma) = host->sg_dma;
  
  	/*
  	 * workaround for erratum #91:
  	 * only start DMA now if we are doing a read,
  	 * otherwise we wait until CMD/RESP has finished
  	 * before starting DMA.
  	 */
  	if (!cpu_is_pxa27x() || data->flags & MMC_DATA_READ)
  		DCSR(host->dma) = DCSR_RUN;
  }
  
  static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
  {
  	WARN_ON(host->cmd != NULL);
  	host->cmd = cmd;
  
  	if (cmd->flags & MMC_RSP_BUSY)
  		cmdat |= CMDAT_BUSY;
  
  #define RSP_TYPE(x)	((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))
  	switch (RSP_TYPE(mmc_resp_type(cmd))) {
  	case RSP_TYPE(MMC_RSP_R1): /* r1, r1b, r6, r7 */
  		cmdat |= CMDAT_RESP_SHORT;
  		break;
  	case RSP_TYPE(MMC_RSP_R3):
  		cmdat |= CMDAT_RESP_R3;
  		break;
  	case RSP_TYPE(MMC_RSP_R2):
  		cmdat |= CMDAT_RESP_R2;
  		break;
  	default:
  		break;
  	}
  
  	writel(cmd->opcode, host->base + MMC_CMD);
  	writel(cmd->arg >> 16, host->base + MMC_ARGH);
  	writel(cmd->arg & 0xffff, host->base + MMC_ARGL);
  	writel(cmdat, host->base + MMC_CMDAT);
  	writel(host->clkrt, host->base + MMC_CLKRT);
  
  	writel(START_CLOCK, host->base + MMC_STRPCL);
  
  	pxamci_enable_irq(host, END_CMD_RES);
  }
  
  static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq)
  {
  	host->mrq = NULL;
  	host->cmd = NULL;
  	host->data = NULL;
  	mmc_request_done(host->mmc, mrq);
  }
  
  static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
  {
  	struct mmc_command *cmd = host->cmd;
  	int i;
  	u32 v;
  
  	if (!cmd)
  		return 0;
  
  	host->cmd = NULL;
  
  	/*
  	 * Did I mention this is Sick.  We always need to
  	 * discard the upper 8 bits of the first 16-bit word.
  	 */
  	v = readl(host->base + MMC_RES) & 0xffff;
  	for (i = 0; i < 4; i++) {
  		u32 w1 = readl(host->base + MMC_RES) & 0xffff;
  		u32 w2 = readl(host->base + MMC_RES) & 0xffff;
  		cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;
  		v = w2;
  	}
  
  	if (stat & STAT_TIME_OUT_RESPONSE) {
  		cmd->error = -ETIMEDOUT;
  	} else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
  		/*
  		 * workaround for erratum #42:
  		 * Intel PXA27x Family Processor Specification Update Rev 001
  		 * A bogus CRC error can appear if the msb of a 136 bit
  		 * response is a one.
  		 */
  		if (cpu_is_pxa27x() &&
  		    (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000))
  			pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode);
  		else
  			cmd->error = -EILSEQ;
  	}
  
  	pxamci_disable_irq(host, END_CMD_RES);
  	if (host->data && !cmd->error) {
  		pxamci_enable_irq(host, DATA_TRAN_DONE);
  		/*
  		 * workaround for erratum #91, if doing write
  		 * enable DMA late
  		 */
  		if (cpu_is_pxa27x() && host->data->flags & MMC_DATA_WRITE)
  			DCSR(host->dma) = DCSR_RUN;
  	} else {
  		pxamci_finish_request(host, host->mrq);
  	}
  
  	return 1;
  }
  
  static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
  {
  	struct mmc_data *data = host->data;
  
  	if (!data)
  		return 0;
  
  	DCSR(host->dma) = 0;
  	dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
  		     host->dma_dir);
  
  	if (stat & STAT_READ_TIME_OUT)
  		data->error = -ETIMEDOUT;
  	else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR))
  		data->error = -EILSEQ;
  
  	/*
  	 * There appears to be a hardware design bug here.  There seems to
  	 * be no way to find out how much data was transferred to the card.
  	 * This means that if there was an error on any block, we mark all
  	 * data blocks as being in error.
  	 */
  	if (!data->error)
  		data->bytes_xfered = data->blocks * data->blksz;
  	else
  		data->bytes_xfered = 0;
  
  	pxamci_disable_irq(host, DATA_TRAN_DONE);
  
  	host->data = NULL;
  	if (host->mrq->stop) {
  		pxamci_stop_clock(host);
  		pxamci_start_cmd(host, host->mrq->stop, host->cmdat);
  	} else {
  		pxamci_finish_request(host, host->mrq);
  	}
  
  	return 1;
  }
  
  static irqreturn_t pxamci_irq(int irq, void *devid)
  {
  	struct pxamci_host *host = devid;
  	unsigned int ireg;
  	int handled = 0;
  
  	ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK);
  
  	if (ireg) {
  		unsigned stat = readl(host->base + MMC_STAT);
  
  		pr_debug("PXAMCI: irq %08x stat %08x\n", ireg, stat);
  
  		if (ireg & END_CMD_RES)
  			handled |= pxamci_cmd_done(host, stat);
  		if (ireg & DATA_TRAN_DONE)
  			handled |= pxamci_data_done(host, stat);
  		if (ireg & SDIO_INT) {
  			mmc_signal_sdio_irq(host->mmc);
  			handled = 1;
  		}
  	}
  
  	return IRQ_RETVAL(handled);
  }
  
  static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq)
  {
  	struct pxamci_host *host = mmc_priv(mmc);
  	unsigned int cmdat;
  
  	WARN_ON(host->mrq != NULL);
  
  	host->mrq = mrq;
  
  	pxamci_stop_clock(host);
  
  	cmdat = host->cmdat;
  	host->cmdat &= ~CMDAT_INIT;
  
  	if (mrq->data) {
  		pxamci_setup_data(host, mrq->data);
  
  		cmdat &= ~CMDAT_BUSY;
  		cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
  		if (mrq->data->flags & MMC_DATA_WRITE)
  			cmdat |= CMDAT_WRITE;
  
  		if (mrq->data->flags & MMC_DATA_STREAM)
  			cmdat |= CMDAT_STREAM;
  	}
  
  	pxamci_start_cmd(host, mrq->cmd, cmdat);
  }
  
  static int pxamci_get_ro(struct mmc_host *mmc)
  {
  	struct pxamci_host *host = mmc_priv(mmc);
  
  	if (host->pdata && gpio_is_valid(host->pdata->gpio_card_ro)) {
  		if (host->pdata->gpio_card_ro_invert)
  			return !gpio_get_value(host->pdata->gpio_card_ro);
  		else
  			return gpio_get_value(host->pdata->gpio_card_ro);
  	}
  	if (host->pdata && host->pdata->get_ro)
  		return !!host->pdata->get_ro(mmc_dev(mmc));
  	/*
  	 * Board doesn't support read only detection; let the mmc core
  	 * decide what to do.
  	 */
  	return -ENOSYS;
  }
  
  static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
  {
  	struct pxamci_host *host = mmc_priv(mmc);
  
  	if (ios->clock) {
  		unsigned long rate = host->clkrate;
  		unsigned int clk = rate / ios->clock;
  
  		if (host->clkrt == CLKRT_OFF)
  			clk_enable(host->clk);
  
  		if (ios->clock == 26000000) {
  			/* to support 26MHz */
  			host->clkrt = 7;
  		} else {
  			/* to handle (19.5MHz, 26MHz) */
  			if (!clk)
  				clk = 1;
  
  			/*
  			 * clk might result in a lower divisor than we
  			 * desire.  check for that condition and adjust
  			 * as appropriate.
  			 */
  			if (rate / clk > ios->clock)
  				clk <<= 1;
  			host->clkrt = fls(clk) - 1;
  		}
  
  		/*
  		 * we write clkrt on the next command
  		 */
  	} else {
  		pxamci_stop_clock(host);
  		if (host->clkrt != CLKRT_OFF) {
  			host->clkrt = CLKRT_OFF;
  			clk_disable(host->clk);
  		}
  	}
  
  	if (host->power_mode != ios->power_mode) {
  		int ret;
  
  		host->power_mode = ios->power_mode;
  
  		ret = pxamci_set_power(host, ios->power_mode, ios->vdd);
  		if (ret) {
  			dev_err(mmc_dev(mmc), "unable to set power\n");
  			/*
  			 * The .set_ios() function in the mmc_host_ops
  			 * struct return void, and failing to set the
  			 * power should be rare so we print an error and
  			 * return here.
  			 */
  			return;
  		}
  
  		if (ios->power_mode == MMC_POWER_ON)
  			host->cmdat |= CMDAT_INIT;
  	}
  
  	if (ios->bus_width == MMC_BUS_WIDTH_4)
  		host->cmdat |= CMDAT_SD_4DAT;
  	else
  		host->cmdat &= ~CMDAT_SD_4DAT;
  
  	dev_dbg(mmc_dev(mmc), "PXAMCI: clkrt = %x cmdat = %x\n",
  		host->clkrt, host->cmdat);
  }
  
  static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable)
  {
  	struct pxamci_host *pxa_host = mmc_priv(host);
  
  	if (enable)
  		pxamci_enable_irq(pxa_host, SDIO_INT);
  	else
  		pxamci_disable_irq(pxa_host, SDIO_INT);
  }
  
  static const struct mmc_host_ops pxamci_ops = {
  	.request		= pxamci_request,
  	.get_ro			= pxamci_get_ro,
  	.set_ios		= pxamci_set_ios,
  	.enable_sdio_irq	= pxamci_enable_sdio_irq,
  };
  
  static void pxamci_dma_irq(int dma, void *devid)
  {
  	struct pxamci_host *host = devid;
  	int dcsr = DCSR(dma);
  	DCSR(dma) = dcsr & ~DCSR_STOPIRQEN;
  
  	if (dcsr & DCSR_ENDINTR) {
  		writel(BUF_PART_FULL, host->base + MMC_PRTBUF);
  	} else {
  		printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
  		       mmc_hostname(host->mmc), dma, dcsr);
  		host->data->error = -EIO;
  		pxamci_data_done(host, 0);
  	}
  }
  
  static irqreturn_t pxamci_detect_irq(int irq, void *devid)
  {
  	struct pxamci_host *host = mmc_priv(devid);
  
  	mmc_detect_change(devid, host->pdata->detect_delay);
  	return IRQ_HANDLED;
  }
  
  static int pxamci_probe(struct platform_device *pdev)
  {
  	struct mmc_host *mmc;
  	struct pxamci_host *host = NULL;
  	struct resource *r, *dmarx, *dmatx;
  	int ret, irq, gpio_cd = -1, gpio_ro = -1, gpio_power = -1;
  
  	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	irq = platform_get_irq(pdev, 0);
  	if (!r || irq < 0)
  		return -ENXIO;
  
  	r = request_mem_region(r->start, SZ_4K, DRIVER_NAME);
  	if (!r)
  		return -EBUSY;
  
  	mmc = mmc_alloc_host(sizeof(struct pxamci_host), &pdev->dev);
  	if (!mmc) {
  		ret = -ENOMEM;
  		goto out;
  	}
  
  	mmc->ops = &pxamci_ops;
  
  	/*
  	 * We can do SG-DMA, but we don't because we never know how much
  	 * data we successfully wrote to the card.
  	 */
  	mmc->max_phys_segs = NR_SG;
  
  	/*
  	 * Our hardware DMA can handle a maximum of one page per SG entry.
  	 */
  	mmc->max_seg_size = PAGE_SIZE;
  
  	/*
  	 * Block length register is only 10 bits before PXA27x.
  	 */
  	mmc->max_blk_size = cpu_is_pxa25x() ? 1023 : 2048;
  
  	/*
  	 * Block count register is 16 bits.
  	 */
  	mmc->max_blk_count = 65535;
  
  	host = mmc_priv(mmc);
  	host->mmc = mmc;
  	host->dma = -1;
  	host->pdata = pdev->dev.platform_data;
  	host->clkrt = CLKRT_OFF;
  
  	host->clk = clk_get(&pdev->dev, NULL);
  	if (IS_ERR(host->clk)) {
  		ret = PTR_ERR(host->clk);
  		host->clk = NULL;
  		goto out;
  	}
  
  	host->clkrate = clk_get_rate(host->clk);
  
  	/*
  	 * Calculate minimum clock rate, rounding up.
  	 */
  	mmc->f_min = (host->clkrate + 63) / 64;
  	mmc->f_max = (mmc_has_26MHz()) ? 26000000 : host->clkrate;
  
  	pxamci_init_ocr(host);
  
  	mmc->caps = 0;
  	host->cmdat = 0;
  	if (!cpu_is_pxa25x()) {
  		mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
  		host->cmdat |= CMDAT_SDIO_INT_EN;
  		if (mmc_has_26MHz())
  			mmc->caps |= MMC_CAP_MMC_HIGHSPEED |
  				     MMC_CAP_SD_HIGHSPEED;
  	}
  
  	host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
  	if (!host->sg_cpu) {
  		ret = -ENOMEM;
  		goto out;
  	}
  
  	spin_lock_init(&host->lock);
  	host->res = r;
  	host->irq = irq;
  	host->imask = MMC_I_MASK_ALL;
  
  	host->base = ioremap(r->start, SZ_4K);
  	if (!host->base) {
  		ret = -ENOMEM;
  		goto out;
  	}
  
  	/*
  	 * Ensure that the host controller is shut down, and setup
  	 * with our defaults.
  	 */
  	pxamci_stop_clock(host);
  	writel(0, host->base + MMC_SPI);
  	writel(64, host->base + MMC_RESTO);
  	writel(host->imask, host->base + MMC_I_MASK);
  
  	host->dma = pxa_request_dma(DRIVER_NAME, DMA_PRIO_LOW,
  				    pxamci_dma_irq, host);
  	if (host->dma < 0) {
  		ret = -EBUSY;
  		goto out;
  	}
  
  	ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host);
  	if (ret)
  		goto out;
  
  	platform_set_drvdata(pdev, mmc);
  
  	dmarx = platform_get_resource(pdev, IORESOURCE_DMA, 0);
  	if (!dmarx) {
  		ret = -ENXIO;
  		goto out;
  	}
  	host->dma_drcmrrx = dmarx->start;
  
  	dmatx = platform_get_resource(pdev, IORESOURCE_DMA, 1);
  	if (!dmatx) {
  		ret = -ENXIO;
  		goto out;
  	}
  	host->dma_drcmrtx = dmatx->start;
  
  	if (host->pdata) {
  		gpio_cd = host->pdata->gpio_card_detect;
  		gpio_ro = host->pdata->gpio_card_ro;
  		gpio_power = host->pdata->gpio_power;
  	}
  	if (gpio_is_valid(gpio_power)) {
  		ret = gpio_request(gpio_power, "mmc card power");
  		if (ret) {
  			dev_err(&pdev->dev, "Failed requesting gpio_power %d\n", gpio_power);
  			goto out;
  		}
  		gpio_direction_output(gpio_power,
  				      host->pdata->gpio_power_invert);
  	}
  	if (gpio_is_valid(gpio_ro)) {
  		ret = gpio_request(gpio_ro, "mmc card read only");
  		if (ret) {
  			dev_err(&pdev->dev, "Failed requesting gpio_ro %d\n", gpio_ro);
  			goto err_gpio_ro;
  		}
  		gpio_direction_input(gpio_ro);
  	}
  	if (gpio_is_valid(gpio_cd)) {
  		ret = gpio_request(gpio_cd, "mmc card detect");
  		if (ret) {
  			dev_err(&pdev->dev, "Failed requesting gpio_cd %d\n", gpio_cd);
  			goto err_gpio_cd;
  		}
  		gpio_direction_input(gpio_cd);
  
  		ret = request_irq(gpio_to_irq(gpio_cd), pxamci_detect_irq,
  				  IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
  				  "mmc card detect", mmc);
  		if (ret) {
  			dev_err(&pdev->dev, "failed to request card detect IRQ\n");
  			goto err_request_irq;
  		}
  	}
  
  	if (host->pdata && host->pdata->init)
  		host->pdata->init(&pdev->dev, pxamci_detect_irq, mmc);
  
  	if (gpio_is_valid(gpio_power) && host->pdata->setpower)
  		dev_warn(&pdev->dev, "gpio_power and setpower() both defined\n");
  	if (gpio_is_valid(gpio_ro) && host->pdata->get_ro)
  		dev_warn(&pdev->dev, "gpio_ro and get_ro() both defined\n");
  
  	mmc_add_host(mmc);
  
  	return 0;
  
  err_request_irq:
  	gpio_free(gpio_cd);
  err_gpio_cd:
  	gpio_free(gpio_ro);
  err_gpio_ro:
  	gpio_free(gpio_power);
   out:
  	if (host) {
  		if (host->dma >= 0)
  			pxa_free_dma(host->dma);
  		if (host->base)
  			iounmap(host->base);
  		if (host->sg_cpu)
  			dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
  		if (host->clk)
  			clk_put(host->clk);
  	}
  	if (mmc)
  		mmc_free_host(mmc);
  	release_resource(r);
  	return ret;
  }
  
  static int pxamci_remove(struct platform_device *pdev)
  {
  	struct mmc_host *mmc = platform_get_drvdata(pdev);
  	int gpio_cd = -1, gpio_ro = -1, gpio_power = -1;
  
  	platform_set_drvdata(pdev, NULL);
  
  	if (mmc) {
  		struct pxamci_host *host = mmc_priv(mmc);
  
  		mmc_remove_host(mmc);
  
  		if (host->pdata) {
  			gpio_cd = host->pdata->gpio_card_detect;
  			gpio_ro = host->pdata->gpio_card_ro;
  			gpio_power = host->pdata->gpio_power;
  		}
  		if (gpio_is_valid(gpio_cd)) {
  			free_irq(gpio_to_irq(gpio_cd), mmc);
  			gpio_free(gpio_cd);
  		}
  		if (gpio_is_valid(gpio_ro))
  			gpio_free(gpio_ro);
  		if (gpio_is_valid(gpio_power))
  			gpio_free(gpio_power);
  		if (host->vcc)
  			regulator_put(host->vcc);
  
  		if (host->pdata && host->pdata->exit)
  			host->pdata->exit(&pdev->dev, mmc);
  
  		pxamci_stop_clock(host);
  		writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
  		       END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
  		       host->base + MMC_I_MASK);
  
  		DRCMR(host->dma_drcmrrx) = 0;
  		DRCMR(host->dma_drcmrtx) = 0;
  
  		free_irq(host->irq, host);
  		pxa_free_dma(host->dma);
  		iounmap(host->base);
  		dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
  
  		clk_put(host->clk);
  
  		release_resource(host->res);
  
  		mmc_free_host(mmc);
  	}
  	return 0;
  }
  
  #ifdef CONFIG_PM
  static int pxamci_suspend(struct device *dev)
  {
  	struct mmc_host *mmc = dev_get_drvdata(dev);
  	int ret = 0;
  
  	if (mmc)
  		ret = mmc_suspend_host(mmc, PMSG_SUSPEND);
  
  	return ret;
  }
  
  static int pxamci_resume(struct device *dev)
  {
  	struct mmc_host *mmc = dev_get_drvdata(dev);
  	int ret = 0;
  
  	if (mmc)
  		ret = mmc_resume_host(mmc);
  
  	return ret;
  }
  
  static const struct dev_pm_ops pxamci_pm_ops = {
  	.suspend	= pxamci_suspend,
  	.resume		= pxamci_resume,
  };
  #endif
  
  static struct platform_driver pxamci_driver = {
  	.probe		= pxamci_probe,
  	.remove		= pxamci_remove,
  	.driver		= {
  		.name	= DRIVER_NAME,
  		.owner	= THIS_MODULE,
  #ifdef CONFIG_PM
  		.pm	= &pxamci_pm_ops,
  #endif
  	},
  };
  
  static int __init pxamci_init(void)
  {
  	return platform_driver_register(&pxamci_driver);
  }
  
  static void __exit pxamci_exit(void)
  {
  	platform_driver_unregister(&pxamci_driver);
  }
  
  module_init(pxamci_init);
  module_exit(pxamci_exit);
  
  MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:pxa2xx-mci");
  