[deliverable/linux.git] / drivers / mmc / host / mmci.c

/*
 *  linux/drivers/mmc/host/mmci.c - ARM PrimeCell MMCI PL180/1 driver
 *
 *  Copyright (C) 2003 Deep Blue Solutions, Ltd, 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.
 */
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/log2.h>
#include <linux/mmc/host.h>
#include <linux/amba/bus.h>
#include <linux/clk.h>
#include <linux/scatterlist.h>

#include <asm/cacheflush.h>
#include <asm/div64.h>
#include <asm/io.h>
#include <asm/sizes.h>
#include <asm/mach/mmc.h>

#include "mmci.h"

#define DRIVER_NAME "mmci-pl18x"

#define DBG(host,fmt,args...)	\
	pr_debug("%s: %s: " fmt, mmc_hostname(host->mmc), __func__ , args)

static unsigned int fmax = 515633;

static void
mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
{
	writel(0, host->base + MMCICOMMAND);

	BUG_ON(host->data);

	host->mrq = NULL;
	host->cmd = NULL;

	if (mrq->data)
		mrq->data->bytes_xfered = host->data_xfered;

	/*
	 * Need to drop the host lock here; mmc_request_done may call
	 * back into the driver...
	 */
	spin_unlock(&host->lock);
	mmc_request_done(host->mmc, mrq);
	spin_lock(&host->lock);
}

static void mmci_stop_data(struct mmci_host *host)
{
	writel(0, host->base + MMCIDATACTRL);
	writel(0, host->base + MMCIMASK1);
	host->data = NULL;
}

static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
{
	unsigned int datactrl, timeout, irqmask;
	unsigned long long clks;
	void __iomem *base;
	int blksz_bits;

	DBG(host, "blksz %04x blks %04x flags %08x\n",
	    data->blksz, data->blocks, data->flags);

	host->data = data;
	host->size = data->blksz;
	host->data_xfered = 0;

	mmci_init_sg(host, data);

	clks = (unsigned long long)data->timeout_ns * host->cclk;
	do_div(clks, 1000000000UL);

	timeout = data->timeout_clks + (unsigned int)clks;

	base = host->base;
	writel(timeout, base + MMCIDATATIMER);
	writel(host->size, base + MMCIDATALENGTH);

	blksz_bits = ffs(data->blksz) - 1;
	BUG_ON(1 << blksz_bits != data->blksz);

	datactrl = MCI_DPSM_ENABLE | blksz_bits << 4;
	if (data->flags & MMC_DATA_READ) {
		datactrl |= MCI_DPSM_DIRECTION;
		irqmask = MCI_RXFIFOHALFFULLMASK;

		/*
		 * If we have less than a FIFOSIZE of bytes to transfer,
		 * trigger a PIO interrupt as soon as any data is available.
		 */
		if (host->size < MCI_FIFOSIZE)
			irqmask |= MCI_RXDATAAVLBLMASK;
	} else {
		/*
		 * We don't actually need to include "FIFO empty" here
		 * since its implicit in "FIFO half empty".
		 */
		irqmask = MCI_TXFIFOHALFEMPTYMASK;
	}

	writel(datactrl, base + MMCIDATACTRL);
	writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
	writel(irqmask, base + MMCIMASK1);
}

static void
mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
{
	void __iomem *base = host->base;

	DBG(host, "op %02x arg %08x flags %08x\n",
	    cmd->opcode, cmd->arg, cmd->flags);

	if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
		writel(0, base + MMCICOMMAND);
		udelay(1);
	}

	c |= cmd->opcode | MCI_CPSM_ENABLE;
	if (cmd->flags & MMC_RSP_PRESENT) {
		if (cmd->flags & MMC_RSP_136)
			c |= MCI_CPSM_LONGRSP;
		c |= MCI_CPSM_RESPONSE;
	}
	if (/*interrupt*/0)
		c |= MCI_CPSM_INTERRUPT;

	host->cmd = cmd;

	writel(cmd->arg, base + MMCIARGUMENT);
	writel(c, base + MMCICOMMAND);
}

static void
mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
	      unsigned int status)
{
	if (status & MCI_DATABLOCKEND) {
		host->data_xfered += data->blksz;
	}
	if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
		if (status & MCI_DATACRCFAIL)
			data->error = -EILSEQ;
		else if (status & MCI_DATATIMEOUT)
			data->error = -ETIMEDOUT;
		else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
			data->error = -EIO;
		status |= MCI_DATAEND;

		/*
		 * We hit an error condition.  Ensure that any data
		 * partially written to a page is properly coherent.
		 */
		if (host->sg_len && data->flags & MMC_DATA_READ)
			flush_dcache_page(sg_page(host->sg_ptr));
	}
	if (status & MCI_DATAEND) {
		mmci_stop_data(host);

		if (!data->stop) {
			mmci_request_end(host, data->mrq);
		} else {
			mmci_start_command(host, data->stop, 0);
		}
	}
}

static void
mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
	     unsigned int status)
{
	void __iomem *base = host->base;

	host->cmd = NULL;

	cmd->resp[0] = readl(base + MMCIRESPONSE0);
	cmd->resp[1] = readl(base + MMCIRESPONSE1);
	cmd->resp[2] = readl(base + MMCIRESPONSE2);
	cmd->resp[3] = readl(base + MMCIRESPONSE3);

	if (status & MCI_CMDTIMEOUT) {
		cmd->error = -ETIMEDOUT;
	} else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
		cmd->error = -EILSEQ;
	}

	if (!cmd->data || cmd->error) {
		if (host->data)
			mmci_stop_data(host);
		mmci_request_end(host, cmd->mrq);
	} else if (!(cmd->data->flags & MMC_DATA_READ)) {
		mmci_start_data(host, cmd->data);
	}
}

static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
{
	void __iomem *base = host->base;
	char *ptr = buffer;
	u32 status;
	int host_remain = host->size;

	do {
		int count = host_remain - (readl(base + MMCIFIFOCNT) << 2);

		if (count > remain)
			count = remain;

		if (count <= 0)
			break;

		readsl(base + MMCIFIFO, ptr, count >> 2);

		ptr += count;
		remain -= count;
		host_remain -= count;

		if (remain == 0)
			break;

		status = readl(base + MMCISTATUS);
	} while (status & MCI_RXDATAAVLBL);

	return ptr - buffer;
}

static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
{
	void __iomem *base = host->base;
	char *ptr = buffer;

	do {
		unsigned int count, maxcnt;

		maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE;
		count = min(remain, maxcnt);

		writesl(base + MMCIFIFO, ptr, count >> 2);

		ptr += count;
		remain -= count;

		if (remain == 0)
			break;

		status = readl(base + MMCISTATUS);
	} while (status & MCI_TXFIFOHALFEMPTY);

	return ptr - buffer;
}

/*
 * PIO data transfer IRQ handler.
 */
static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
{
	struct mmci_host *host = dev_id;
	void __iomem *base = host->base;
	u32 status;

	status = readl(base + MMCISTATUS);

	DBG(host, "irq1 %08x\n", status);

	do {
		unsigned long flags;
		unsigned int remain, len;
		char *buffer;

		/*
		 * For write, we only need to test the half-empty flag
		 * here - if the FIFO is completely empty, then by
		 * definition it is more than half empty.
		 *
		 * For read, check for data available.
		 */
		if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
			break;

		/*
		 * Map the current scatter buffer.
		 */
		buffer = mmci_kmap_atomic(host, &flags) + host->sg_off;
		remain = host->sg_ptr->length - host->sg_off;

		len = 0;
		if (status & MCI_RXACTIVE)
			len = mmci_pio_read(host, buffer, remain);
		if (status & MCI_TXACTIVE)
			len = mmci_pio_write(host, buffer, remain, status);

		/*
		 * Unmap the buffer.
		 */
		mmci_kunmap_atomic(host, buffer, &flags);

		host->sg_off += len;
		host->size -= len;
		remain -= len;

		if (remain)
			break;

		/*
		 * If we were reading, and we have completed this
		 * page, ensure that the data cache is coherent.
		 */
		if (status & MCI_RXACTIVE)
			flush_dcache_page(sg_page(host->sg_ptr));

		if (!mmci_next_sg(host))
			break;

		status = readl(base + MMCISTATUS);
	} while (1);

	/*
	 * If we're nearing the end of the read, switch to
	 * "any data available" mode.
	 */
	if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE)
		writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);

	/*
	 * If we run out of data, disable the data IRQs; this
	 * prevents a race where the FIFO becomes empty before
	 * the chip itself has disabled the data path, and
	 * stops us racing with our data end IRQ.
	 */
	if (host->size == 0) {
		writel(0, base + MMCIMASK1);
		writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
	}

	return IRQ_HANDLED;
}

/*
 * Handle completion of command and data transfers.
 */
static irqreturn_t mmci_irq(int irq, void *dev_id)
{
	struct mmci_host *host = dev_id;
	u32 status;
	int ret = 0;

	spin_lock(&host->lock);

	do {
		struct mmc_command *cmd;
		struct mmc_data *data;

		status = readl(host->base + MMCISTATUS);
		status &= readl(host->base + MMCIMASK0);
		writel(status, host->base + MMCICLEAR);

		DBG(host, "irq0 %08x\n", status);

		data = host->data;
		if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|
			      MCI_RXOVERRUN|MCI_DATAEND|MCI_DATABLOCKEND) && data)
			mmci_data_irq(host, data, status);

		cmd = host->cmd;
		if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd)
			mmci_cmd_irq(host, cmd, status);

		ret = 1;
	} while (status);

	spin_unlock(&host->lock);

	return IRQ_RETVAL(ret);
}

static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
	struct mmci_host *host = mmc_priv(mmc);
	unsigned long flags;

	WARN_ON(host->mrq != NULL);

	if (mrq->data && !is_power_of_2(mrq->data->blksz)) {
		printk(KERN_ERR "%s: Unsupported block size (%d bytes)\n",
			mmc_hostname(mmc), mrq->data->blksz);
		mrq->cmd->error = -EINVAL;
		mmc_request_done(mmc, mrq);
		return;
	}

	spin_lock_irqsave(&host->lock, flags);

	host->mrq = mrq;

	if (mrq->data && mrq->data->flags & MMC_DATA_READ)
		mmci_start_data(host, mrq->data);

	mmci_start_command(host, mrq->cmd, 0);

	spin_unlock_irqrestore(&host->lock, flags);
}

static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
	struct mmci_host *host = mmc_priv(mmc);
	u32 clk = 0, pwr = 0;

	if (ios->clock) {
		if (ios->clock >= host->mclk) {
			clk = MCI_CLK_BYPASS;
			host->cclk = host->mclk;
		} else {
			clk = host->mclk / (2 * ios->clock) - 1;
			if (clk >= 256)
				clk = 255;
			host->cclk = host->mclk / (2 * (clk + 1));
		}
		clk |= MCI_CLK_ENABLE;
	}

	if (host->plat->translate_vdd)
		pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);

	switch (ios->power_mode) {
	case MMC_POWER_OFF:
		break;
	case MMC_POWER_UP:
		pwr |= MCI_PWR_UP;
		break;
	case MMC_POWER_ON:
		pwr |= MCI_PWR_ON;
		break;
	}

	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
		pwr |= MCI_ROD;

	writel(clk, host->base + MMCICLOCK);

	if (host->pwr != pwr) {
		host->pwr = pwr;
		writel(pwr, host->base + MMCIPOWER);
	}
}

static const struct mmc_host_ops mmci_ops = {
	.request	= mmci_request,
	.set_ios	= mmci_set_ios,
};

static void mmci_check_status(unsigned long data)
{
	struct mmci_host *host = (struct mmci_host *)data;
	unsigned int status;

	status = host->plat->status(mmc_dev(host->mmc));
	if (status ^ host->oldstat)
		mmc_detect_change(host->mmc, 0);

	host->oldstat = status;
	mod_timer(&host->timer, jiffies + HZ);
}

static int mmci_probe(struct amba_device *dev, void *id)
{
	struct mmc_platform_data *plat = dev->dev.platform_data;
	struct mmci_host *host;
	struct mmc_host *mmc;
	int ret;

	/* must have platform data */
	if (!plat) {
		ret = -EINVAL;
		goto out;
	}

	ret = amba_request_regions(dev, DRIVER_NAME);
	if (ret)
		goto out;

	mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
	if (!mmc) {
		ret = -ENOMEM;
		goto rel_regions;
	}

	host = mmc_priv(mmc);
	host->clk = clk_get(&dev->dev, NULL);
	if (IS_ERR(host->clk)) {
		ret = PTR_ERR(host->clk);
		host->clk = NULL;
		goto host_free;
	}

	ret = clk_enable(host->clk);
	if (ret)
		goto clk_free;

	host->plat = plat;
	host->mclk = clk_get_rate(host->clk);
	/*
	 * According to the spec, mclk is max 100 MHz,
	 * so we try to adjust the clock down to this,
	 * (if possible).
	 */
	if (host->mclk > 100000000) {
		ret = clk_set_rate(host->clk, 100000000);
		if (ret < 0)
			goto clk_disable;
		host->mclk = clk_get_rate(host->clk);
		DBG(host, "eventual mclk rate: %u Hz\n", host->mclk);
	}
	host->mmc = mmc;
	host->base = ioremap(dev->res.start, SZ_4K);
	if (!host->base) {
		ret = -ENOMEM;
		goto clk_disable;
	}

	mmc->ops = &mmci_ops;
	mmc->f_min = (host->mclk + 511) / 512;
	mmc->f_max = min(host->mclk, fmax);
	mmc->ocr_avail = plat->ocr_mask;

	/*
	 * We can do SGIO
	 */
	mmc->max_hw_segs = 16;
	mmc->max_phys_segs = NR_SG;

	/*
	 * Since we only have a 16-bit data length register, we must
	 * ensure that we don't exceed 2^16-1 bytes in a single request.
	 */
	mmc->max_req_size = 65535;

	/*
	 * Set the maximum segment size.  Since we aren't doing DMA
	 * (yet) we are only limited by the data length register.
	 */
	mmc->max_seg_size = mmc->max_req_size;

	/*
	 * Block size can be up to 2048 bytes, but must be a power of two.
	 */
	mmc->max_blk_size = 2048;

	/*
	 * No limit on the number of blocks transferred.
	 */
	mmc->max_blk_count = mmc->max_req_size;

	spin_lock_init(&host->lock);

	writel(0, host->base + MMCIMASK0);
	writel(0, host->base + MMCIMASK1);
	writel(0xfff, host->base + MMCICLEAR);

	ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host);
	if (ret)
		goto unmap;

	ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, DRIVER_NAME " (pio)", host);
	if (ret)
		goto irq0_free;

	writel(MCI_IRQENABLE, host->base + MMCIMASK0);

	amba_set_drvdata(dev, mmc);

	mmc_add_host(mmc);

	printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%016llx irq %d,%d\n",
		mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
		(unsigned long long)dev->res.start, dev->irq[0], dev->irq[1]);

	init_timer(&host->timer);
	host->timer.data = (unsigned long)host;
	host->timer.function = mmci_check_status;
	host->timer.expires = jiffies + HZ;
	add_timer(&host->timer);

	return 0;

 irq0_free:
	free_irq(dev->irq[0], host);
 unmap:
	iounmap(host->base);
 clk_disable:
	clk_disable(host->clk);
 clk_free:
	clk_put(host->clk);
 host_free:
	mmc_free_host(mmc);
 rel_regions:
	amba_release_regions(dev);
 out:
	return ret;
}

static int mmci_remove(struct amba_device *dev)
{
	struct mmc_host *mmc = amba_get_drvdata(dev);

	amba_set_drvdata(dev, NULL);

	if (mmc) {
		struct mmci_host *host = mmc_priv(mmc);

		del_timer_sync(&host->timer);

		mmc_remove_host(mmc);

		writel(0, host->base + MMCIMASK0);
		writel(0, host->base + MMCIMASK1);

		writel(0, host->base + MMCICOMMAND);
		writel(0, host->base + MMCIDATACTRL);

		free_irq(dev->irq[0], host);
		free_irq(dev->irq[1], host);

		iounmap(host->base);
		clk_disable(host->clk);
		clk_put(host->clk);

		mmc_free_host(mmc);

		amba_release_regions(dev);
	}

	return 0;
}

#ifdef CONFIG_PM
static int mmci_suspend(struct amba_device *dev, pm_message_t state)
{
	struct mmc_host *mmc = amba_get_drvdata(dev);
	int ret = 0;

	if (mmc) {
		struct mmci_host *host = mmc_priv(mmc);

		ret = mmc_suspend_host(mmc, state);
		if (ret == 0)
			writel(0, host->base + MMCIMASK0);
	}

	return ret;
}

static int mmci_resume(struct amba_device *dev)
{
	struct mmc_host *mmc = amba_get_drvdata(dev);
	int ret = 0;

	if (mmc) {
		struct mmci_host *host = mmc_priv(mmc);

		writel(MCI_IRQENABLE, host->base + MMCIMASK0);

		ret = mmc_resume_host(mmc);
	}

	return ret;
}
#else
#define mmci_suspend	NULL
#define mmci_resume	NULL
#endif

static struct amba_id mmci_ids[] = {
	{
		.id	= 0x00041180,
		.mask	= 0x000fffff,
	},
	{
		.id	= 0x00041181,
		.mask	= 0x000fffff,
	},
	{ 0, 0 },
};

static struct amba_driver mmci_driver = {
	.drv		= {
		.name	= DRIVER_NAME,
	},
	.probe		= mmci_probe,
	.remove		= mmci_remove,
	.suspend	= mmci_suspend,
	.resume		= mmci_resume,
	.id_table	= mmci_ids,
};

static int __init mmci_init(void)
{
	return amba_driver_register(&mmci_driver);
}

static void __exit mmci_exit(void)
{
	amba_driver_unregister(&mmci_driver);
}

module_init(mmci_init);
module_exit(mmci_exit);
module_param(fmax, uint, 0444);

MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4	1	/*
70f10482	2	* linux/drivers/mmc/host/mmci.c - ARM PrimeCell MMCI PL180/1 driver
1da177e4 LT	3	*
	4	* Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
1da177e4 LT	10	#include <linux/module.h>
	11	#include <linux/moduleparam.h>
	12	#include <linux/init.h>
	13	#include <linux/ioport.h>
	14	#include <linux/device.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/delay.h>
	17	#include <linux/err.h>
	18	#include <linux/highmem.h>
019a5f56	19	#include <linux/log2.h>
1da177e4	20	#include <linux/mmc/host.h>
a62c80e5	21	#include <linux/amba/bus.h>
f8ce2547	22	#include <linux/clk.h>
bd6dee6f	23	#include <linux/scatterlist.h>
1da177e4	24
e9c091b4	25	#include <asm/cacheflush.h>
7b09cdac	26	#include <asm/div64.h>
1da177e4	27	#include <asm/io.h>
c6b8fdad	28	#include <asm/sizes.h>
1da177e4 LT	29	#include <asm/mach/mmc.h>
	30
	31	#include "mmci.h"
	32
	33	#define DRIVER_NAME "mmci-pl18x"
	34
1da177e4	35	#define DBG(host,fmt,args...) \
d366b643	36	pr_debug("%s: %s: " fmt, mmc_hostname(host->mmc), __func__ , args)
1da177e4 LT	37
	38	static unsigned int fmax = 515633;
	39
	40	static void
	41	mmci_request_end(struct mmci_host host, struct mmc_request mrq)
	42	{
	43	writel(0, host->base + MMCICOMMAND);
	44
e47c222b RK	45	BUG_ON(host->data);
e47c222b RK	46
1da177e4 LT	47	host->mrq = NULL;
	48	host->cmd = NULL;
	49
	50	if (mrq->data)
	51	mrq->data->bytes_xfered = host->data_xfered;
	52
	53	/*
	54	* Need to drop the host lock here; mmc_request_done may call
	55	* back into the driver...
	56	*/
	57	spin_unlock(&host->lock);
	58	mmc_request_done(host->mmc, mrq);
	59	spin_lock(&host->lock);
	60	}
	61
	62	static void mmci_stop_data(struct mmci_host *host)
	63	{
	64	writel(0, host->base + MMCIDATACTRL);
	65	writel(0, host->base + MMCIMASK1);
	66	host->data = NULL;
	67	}
	68
	69	static void mmci_start_data(struct mmci_host host, struct mmc_data data)
	70	{
	71	unsigned int datactrl, timeout, irqmask;
7b09cdac	72	unsigned long long clks;
1da177e4	73	void __iomem *base;
3bc87f24	74	int blksz_bits;
1da177e4 LT	75
1da177e4 LT	76	DBG(host, "blksz %04x blks %04x flags %08x\n",
3bc87f24	77	data->blksz, data->blocks, data->flags);
1da177e4 LT	78
1da177e4 LT	79	host->data = data;
3bc87f24	80	host->size = data->blksz;
1da177e4 LT	81	host->data_xfered = 0;
	82
	83	mmci_init_sg(host, data);
	84
7b09cdac RK	85	clks = (unsigned long long)data->timeout_ns * host->cclk;
	86	do_div(clks, 1000000000UL);
	87
	88	timeout = data->timeout_clks + (unsigned int)clks;
1da177e4 LT	89
	90	base = host->base;
	91	writel(timeout, base + MMCIDATATIMER);
	92	writel(host->size, base + MMCIDATALENGTH);
	93
3bc87f24 RK	94	blksz_bits = ffs(data->blksz) - 1;
	95	BUG_ON(1 << blksz_bits != data->blksz);
	96
	97	datactrl = MCI_DPSM_ENABLE \| blksz_bits << 4;
1da177e4 LT	98	if (data->flags & MMC_DATA_READ) {
	99	datactrl \|= MCI_DPSM_DIRECTION;
	100	irqmask = MCI_RXFIFOHALFFULLMASK;
0425a142 RK	101
	102	/*
	103	* If we have less than a FIFOSIZE of bytes to transfer,
	104	* trigger a PIO interrupt as soon as any data is available.
	105	*/
	106	if (host->size < MCI_FIFOSIZE)
	107	irqmask \|= MCI_RXDATAAVLBLMASK;
1da177e4 LT	108	} else {
	109	/*
	110	* We don't actually need to include "FIFO empty" here
	111	* since its implicit in "FIFO half empty".
	112	*/
	113	irqmask = MCI_TXFIFOHALFEMPTYMASK;
	114	}
	115
	116	writel(datactrl, base + MMCIDATACTRL);
	117	writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
	118	writel(irqmask, base + MMCIMASK1);
	119	}
	120
	121	static void
	122	mmci_start_command(struct mmci_host host, struct mmc_command cmd, u32 c)
	123	{
	124	void __iomem *base = host->base;
	125
	126	DBG(host, "op %02x arg %08x flags %08x\n",
	127	cmd->opcode, cmd->arg, cmd->flags);
	128
	129	if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
	130	writel(0, base + MMCICOMMAND);
	131	udelay(1);
	132	}
	133
	134	c \|= cmd->opcode \| MCI_CPSM_ENABLE;
e9225176 RK	135	if (cmd->flags & MMC_RSP_PRESENT) {
	136	if (cmd->flags & MMC_RSP_136)
	137	c \|= MCI_CPSM_LONGRSP;
1da177e4	138	c \|= MCI_CPSM_RESPONSE;
1da177e4 LT	139	}
	140	if (/interrupt/0)
	141	c \|= MCI_CPSM_INTERRUPT;
	142
	143	host->cmd = cmd;
	144
	145	writel(cmd->arg, base + MMCIARGUMENT);
	146	writel(c, base + MMCICOMMAND);
	147	}
	148
	149	static void
	150	mmci_data_irq(struct mmci_host host, struct mmc_data data,
	151	unsigned int status)
	152	{
	153	if (status & MCI_DATABLOCKEND) {
3bc87f24	154	host->data_xfered += data->blksz;
1da177e4 LT	155	}
	156	if (status & (MCI_DATACRCFAIL\|MCI_DATATIMEOUT\|MCI_TXUNDERRUN\|MCI_RXOVERRUN)) {
	157	if (status & MCI_DATACRCFAIL)
17b0429d	158	data->error = -EILSEQ;
1da177e4	159	else if (status & MCI_DATATIMEOUT)
17b0429d	160	data->error = -ETIMEDOUT;
1da177e4	161	else if (status & (MCI_TXUNDERRUN\|MCI_RXOVERRUN))
17b0429d	162	data->error = -EIO;
1da177e4	163	status \|= MCI_DATAEND;
e9c091b4 RK	164
	165	/*
	166	* We hit an error condition. Ensure that any data
	167	* partially written to a page is properly coherent.
	168	*/
	169	if (host->sg_len && data->flags & MMC_DATA_READ)
bd6dee6f	170	flush_dcache_page(sg_page(host->sg_ptr));
1da177e4 LT	171	}
	172	if (status & MCI_DATAEND) {
	173	mmci_stop_data(host);
	174
	175	if (!data->stop) {
	176	mmci_request_end(host, data->mrq);
	177	} else {
	178	mmci_start_command(host, data->stop, 0);
	179	}
	180	}
	181	}
	182
	183	static void
	184	mmci_cmd_irq(struct mmci_host host, struct mmc_command cmd,
	185	unsigned int status)
	186	{
	187	void __iomem *base = host->base;
	188
	189	host->cmd = NULL;
	190
	191	cmd->resp[0] = readl(base + MMCIRESPONSE0);
	192	cmd->resp[1] = readl(base + MMCIRESPONSE1);
	193	cmd->resp[2] = readl(base + MMCIRESPONSE2);
	194	cmd->resp[3] = readl(base + MMCIRESPONSE3);
	195
	196	if (status & MCI_CMDTIMEOUT) {
17b0429d	197	cmd->error = -ETIMEDOUT;
1da177e4	198	} else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
17b0429d	199	cmd->error = -EILSEQ;
1da177e4 LT	200	}
1da177e4 LT	201
17b0429d	202	if (!cmd->data \|\| cmd->error) {
e47c222b RK	203	if (host->data)
e47c222b RK	204	mmci_stop_data(host);
1da177e4 LT	205	mmci_request_end(host, cmd->mrq);
	206	} else if (!(cmd->data->flags & MMC_DATA_READ)) {
	207	mmci_start_data(host, cmd->data);
	208	}
	209	}
	210
	211	static int mmci_pio_read(struct mmci_host host, char buffer, unsigned int remain)
	212	{
	213	void __iomem *base = host->base;
	214	char *ptr = buffer;
	215	u32 status;
26eed9a5	216	int host_remain = host->size;
1da177e4 LT	217
1da177e4 LT	218	do {
26eed9a5	219	int count = host_remain - (readl(base + MMCIFIFOCNT) << 2);
1da177e4 LT	220
	221	if (count > remain)
	222	count = remain;
	223
	224	if (count <= 0)
	225	break;
	226
	227	readsl(base + MMCIFIFO, ptr, count >> 2);
	228
	229	ptr += count;
	230	remain -= count;
26eed9a5	231	host_remain -= count;
1da177e4 LT	232
	233	if (remain == 0)
	234	break;
	235
	236	status = readl(base + MMCISTATUS);
	237	} while (status & MCI_RXDATAAVLBL);
	238
	239	return ptr - buffer;
	240	}
	241
	242	static int mmci_pio_write(struct mmci_host host, char buffer, unsigned int remain, u32 status)
	243	{
	244	void __iomem *base = host->base;
	245	char *ptr = buffer;
	246
	247	do {
	248	unsigned int count, maxcnt;
	249
	250	maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE;
	251	count = min(remain, maxcnt);
	252
	253	writesl(base + MMCIFIFO, ptr, count >> 2);
	254
	255	ptr += count;
	256	remain -= count;
	257
	258	if (remain == 0)
	259	break;
	260
	261	status = readl(base + MMCISTATUS);
	262	} while (status & MCI_TXFIFOHALFEMPTY);
	263
	264	return ptr - buffer;
	265	}
	266
	267	/*
	268	* PIO data transfer IRQ handler.
	269	*/
7d12e780	270	static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
1da177e4 LT	271	{
	272	struct mmci_host *host = dev_id;
	273	void __iomem *base = host->base;
	274	u32 status;
	275
	276	status = readl(base + MMCISTATUS);
	277
	278	DBG(host, "irq1 %08x\n", status);
	279
	280	do {
	281	unsigned long flags;
	282	unsigned int remain, len;
	283	char *buffer;
	284
	285	/*
	286	* For write, we only need to test the half-empty flag
	287	* here - if the FIFO is completely empty, then by
	288	* definition it is more than half empty.
	289	*
	290	* For read, check for data available.
	291	*/
	292	if (!(status & (MCI_TXFIFOHALFEMPTY\|MCI_RXDATAAVLBL)))
	293	break;
	294
	295	/*
	296	* Map the current scatter buffer.
	297	*/
	298	buffer = mmci_kmap_atomic(host, &flags) + host->sg_off;
	299	remain = host->sg_ptr->length - host->sg_off;
	300
	301	len = 0;
	302	if (status & MCI_RXACTIVE)
	303	len = mmci_pio_read(host, buffer, remain);
	304	if (status & MCI_TXACTIVE)
	305	len = mmci_pio_write(host, buffer, remain, status);
	306
	307	/*
	308	* Unmap the buffer.
	309	*/
f3e2628b	310	mmci_kunmap_atomic(host, buffer, &flags);
1da177e4 LT	311
	312	host->sg_off += len;
	313	host->size -= len;
	314	remain -= len;
	315
	316	if (remain)
	317	break;
	318
e9c091b4 RK	319	/*
	320	* If we were reading, and we have completed this
	321	* page, ensure that the data cache is coherent.
	322	*/
	323	if (status & MCI_RXACTIVE)
bd6dee6f	324	flush_dcache_page(sg_page(host->sg_ptr));
e9c091b4	325
1da177e4 LT	326	if (!mmci_next_sg(host))
	327	break;
	328
	329	status = readl(base + MMCISTATUS);
	330	} while (1);
	331
	332	/*
	333	* If we're nearing the end of the read, switch to
	334	* "any data available" mode.
	335	*/
	336	if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE)
	337	writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
	338
	339	/*
	340	* If we run out of data, disable the data IRQs; this
	341	* prevents a race where the FIFO becomes empty before
	342	* the chip itself has disabled the data path, and
	343	* stops us racing with our data end IRQ.
	344	*/
	345	if (host->size == 0) {
	346	writel(0, base + MMCIMASK1);
	347	writel(readl(base + MMCIMASK0) \| MCI_DATAENDMASK, base + MMCIMASK0);
	348	}
	349
	350	return IRQ_HANDLED;
	351	}
	352
	353	/*
	354	* Handle completion of command and data transfers.
	355	*/
7d12e780	356	static irqreturn_t mmci_irq(int irq, void *dev_id)
1da177e4 LT	357	{
	358	struct mmci_host *host = dev_id;
	359	u32 status;
	360	int ret = 0;
	361
	362	spin_lock(&host->lock);
	363
	364	do {
	365	struct mmc_command *cmd;
	366	struct mmc_data *data;
	367
	368	status = readl(host->base + MMCISTATUS);
	369	status &= readl(host->base + MMCIMASK0);
	370	writel(status, host->base + MMCICLEAR);
	371
	372	DBG(host, "irq0 %08x\n", status);
	373
	374	data = host->data;
	375	if (status & (MCI_DATACRCFAIL\|MCI_DATATIMEOUT\|MCI_TXUNDERRUN\|
	376	MCI_RXOVERRUN\|MCI_DATAEND\|MCI_DATABLOCKEND) && data)
	377	mmci_data_irq(host, data, status);
	378
	379	cmd = host->cmd;
	380	if (status & (MCI_CMDCRCFAIL\|MCI_CMDTIMEOUT\|MCI_CMDSENT\|MCI_CMDRESPEND) && cmd)
	381	mmci_cmd_irq(host, cmd, status);
	382
	383	ret = 1;
	384	} while (status);
	385
	386	spin_unlock(&host->lock);
	387
	388	return IRQ_RETVAL(ret);
	389	}
	390
	391	static void mmci_request(struct mmc_host mmc, struct mmc_request mrq)
	392	{
	393	struct mmci_host *host = mmc_priv(mmc);
9e943021	394	unsigned long flags;
1da177e4 LT	395
	396	WARN_ON(host->mrq != NULL);
	397
019a5f56	398	if (mrq->data && !is_power_of_2(mrq->data->blksz)) {
255d01af PO	399	printk(KERN_ERR "%s: Unsupported block size (%d bytes)\n",
	400	mmc_hostname(mmc), mrq->data->blksz);
	401	mrq->cmd->error = -EINVAL;
	402	mmc_request_done(mmc, mrq);
	403	return;
	404	}
	405
9e943021	406	spin_lock_irqsave(&host->lock, flags);
1da177e4 LT	407
	408	host->mrq = mrq;
	409
	410	if (mrq->data && mrq->data->flags & MMC_DATA_READ)
	411	mmci_start_data(host, mrq->data);
	412
	413	mmci_start_command(host, mrq->cmd, 0);
	414
9e943021	415	spin_unlock_irqrestore(&host->lock, flags);
1da177e4 LT	416	}
	417
	418	static void mmci_set_ios(struct mmc_host mmc, struct mmc_ios ios)
	419	{
	420	struct mmci_host *host = mmc_priv(mmc);
	421	u32 clk = 0, pwr = 0;
	422
1da177e4 LT	423	if (ios->clock) {
	424	if (ios->clock >= host->mclk) {
	425	clk = MCI_CLK_BYPASS;
	426	host->cclk = host->mclk;
	427	} else {
	428	clk = host->mclk / (2 * ios->clock) - 1;
c8df9a53	429	if (clk >= 256)
1da177e4 LT	430	clk = 255;
	431	host->cclk = host->mclk / (2 * (clk + 1));
	432	}
	433	clk \|= MCI_CLK_ENABLE;
	434	}
	435
	436	if (host->plat->translate_vdd)
	437	pwr \|= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
	438
	439	switch (ios->power_mode) {
	440	case MMC_POWER_OFF:
	441	break;
	442	case MMC_POWER_UP:
	443	pwr \|= MCI_PWR_UP;
	444	break;
	445	case MMC_POWER_ON:
	446	pwr \|= MCI_PWR_ON;
	447	break;
	448	}
	449
	450	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
	451	pwr \|= MCI_ROD;
	452
	453	writel(clk, host->base + MMCICLOCK);
	454
	455	if (host->pwr != pwr) {
	456	host->pwr = pwr;
	457	writel(pwr, host->base + MMCIPOWER);
	458	}
	459	}
	460
ab7aefd0	461	static const struct mmc_host_ops mmci_ops = {
1da177e4 LT	462	.request = mmci_request,
	463	.set_ios = mmci_set_ios,
	464	};
	465
	466	static void mmci_check_status(unsigned long data)
	467	{
	468	struct mmci_host host = (struct mmci_host )data;
	469	unsigned int status;
	470
	471	status = host->plat->status(mmc_dev(host->mmc));
	472	if (status ^ host->oldstat)
8dc00335	473	mmc_detect_change(host->mmc, 0);
1da177e4 LT	474
	475	host->oldstat = status;
	476	mod_timer(&host->timer, jiffies + HZ);
	477	}
	478
	479	static int mmci_probe(struct amba_device dev, void id)
	480	{
	481	struct mmc_platform_data *plat = dev->dev.platform_data;
	482	struct mmci_host *host;
	483	struct mmc_host *mmc;
	484	int ret;
	485
	486	/* must have platform data */
	487	if (!plat) {
	488	ret = -EINVAL;
	489	goto out;
	490	}
	491
	492	ret = amba_request_regions(dev, DRIVER_NAME);
	493	if (ret)
	494	goto out;
	495
	496	mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
	497	if (!mmc) {
	498	ret = -ENOMEM;
	499	goto rel_regions;
	500	}
	501
	502	host = mmc_priv(mmc);
ee569c43	503	host->clk = clk_get(&dev->dev, NULL);
1da177e4 LT	504	if (IS_ERR(host->clk)) {
	505	ret = PTR_ERR(host->clk);
	506	host->clk = NULL;
	507	goto host_free;
	508	}
	509
1da177e4 LT	510	ret = clk_enable(host->clk);
1da177e4 LT	511	if (ret)
a8d3584a	512	goto clk_free;
1da177e4 LT	513
	514	host->plat = plat;
	515	host->mclk = clk_get_rate(host->clk);
c8df9a53 LW	516	/*
	517	* According to the spec, mclk is max 100 MHz,
	518	* so we try to adjust the clock down to this,
	519	* (if possible).
	520	*/
	521	if (host->mclk > 100000000) {
	522	ret = clk_set_rate(host->clk, 100000000);
	523	if (ret < 0)
	524	goto clk_disable;
	525	host->mclk = clk_get_rate(host->clk);
	526	DBG(host, "eventual mclk rate: %u Hz\n", host->mclk);
	527	}
1da177e4 LT	528	host->mmc = mmc;
	529	host->base = ioremap(dev->res.start, SZ_4K);
	530	if (!host->base) {
	531	ret = -ENOMEM;
	532	goto clk_disable;
	533	}
	534
	535	mmc->ops = &mmci_ops;
	536	mmc->f_min = (host->mclk + 511) / 512;
	537	mmc->f_max = min(host->mclk, fmax);
	538	mmc->ocr_avail = plat->ocr_mask;
	539
	540	/*
	541	* We can do SGIO
	542	*/
	543	mmc->max_hw_segs = 16;
	544	mmc->max_phys_segs = NR_SG;
	545
	546	/*
	547	* Since we only have a 16-bit data length register, we must
	548	* ensure that we don't exceed 2^16-1 bytes in a single request.
1da177e4	549	*/
55db890a	550	mmc->max_req_size = 65535;
1da177e4 LT	551
	552	/*
	553	* Set the maximum segment size. Since we aren't doing DMA
	554	* (yet) we are only limited by the data length register.
	555	*/
55db890a	556	mmc->max_seg_size = mmc->max_req_size;
1da177e4	557
fe4a3c7a PO	558	/*
	559	* Block size can be up to 2048 bytes, but must be a power of two.
	560	*/
	561	mmc->max_blk_size = 2048;
	562
55db890a PO	563	/*
	564	* No limit on the number of blocks transferred.
	565	*/
	566	mmc->max_blk_count = mmc->max_req_size;
	567
1da177e4 LT	568	spin_lock_init(&host->lock);
	569
	570	writel(0, host->base + MMCIMASK0);
	571	writel(0, host->base + MMCIMASK1);
	572	writel(0xfff, host->base + MMCICLEAR);
	573
dace1453	574	ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host);
1da177e4 LT	575	if (ret)
	576	goto unmap;
	577
dace1453	578	ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, DRIVER_NAME " (pio)", host);
1da177e4 LT	579	if (ret)
	580	goto irq0_free;
	581
	582	writel(MCI_IRQENABLE, host->base + MMCIMASK0);
	583
	584	amba_set_drvdata(dev, mmc);
	585
	586	mmc_add_host(mmc);
	587
e29419ff	588	printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%016llx irq %d,%d\n",
d366b643	589	mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
e29419ff	590	(unsigned long long)dev->res.start, dev->irq[0], dev->irq[1]);
1da177e4 LT	591
	592	init_timer(&host->timer);
	593	host->timer.data = (unsigned long)host;
	594	host->timer.function = mmci_check_status;
	595	host->timer.expires = jiffies + HZ;
	596	add_timer(&host->timer);
	597
	598	return 0;
	599
	600	irq0_free:
	601	free_irq(dev->irq[0], host);
	602	unmap:
	603	iounmap(host->base);
	604	clk_disable:
	605	clk_disable(host->clk);
1da177e4 LT	606	clk_free:
	607	clk_put(host->clk);
	608	host_free:
	609	mmc_free_host(mmc);
	610	rel_regions:
	611	amba_release_regions(dev);
	612	out:
	613	return ret;
	614	}
	615
	616	static int mmci_remove(struct amba_device *dev)
	617	{
	618	struct mmc_host *mmc = amba_get_drvdata(dev);
	619
	620	amba_set_drvdata(dev, NULL);
	621
	622	if (mmc) {
	623	struct mmci_host *host = mmc_priv(mmc);
	624
	625	del_timer_sync(&host->timer);
	626
	627	mmc_remove_host(mmc);
	628
	629	writel(0, host->base + MMCIMASK0);
	630	writel(0, host->base + MMCIMASK1);
	631
	632	writel(0, host->base + MMCICOMMAND);
	633	writel(0, host->base + MMCIDATACTRL);
	634
	635	free_irq(dev->irq[0], host);
	636	free_irq(dev->irq[1], host);
	637
	638	iounmap(host->base);
	639	clk_disable(host->clk);
1da177e4 LT	640	clk_put(host->clk);
	641
	642	mmc_free_host(mmc);
	643
	644	amba_release_regions(dev);
	645	}
	646
	647	return 0;
	648	}
	649
	650	#ifdef CONFIG_PM
e5378ca8	651	static int mmci_suspend(struct amba_device *dev, pm_message_t state)
1da177e4 LT	652	{
	653	struct mmc_host *mmc = amba_get_drvdata(dev);
	654	int ret = 0;
	655
	656	if (mmc) {
	657	struct mmci_host *host = mmc_priv(mmc);
	658
	659	ret = mmc_suspend_host(mmc, state);
	660	if (ret == 0)
	661	writel(0, host->base + MMCIMASK0);
	662	}
	663
	664	return ret;
	665	}
	666
	667	static int mmci_resume(struct amba_device *dev)
	668	{
	669	struct mmc_host *mmc = amba_get_drvdata(dev);
	670	int ret = 0;
	671
	672	if (mmc) {
	673	struct mmci_host *host = mmc_priv(mmc);
	674
	675	writel(MCI_IRQENABLE, host->base + MMCIMASK0);
	676
	677	ret = mmc_resume_host(mmc);
	678	}
	679
	680	return ret;
	681	}
	682	#else
	683	#define mmci_suspend NULL
	684	#define mmci_resume NULL
	685	#endif
	686
	687	static struct amba_id mmci_ids[] = {
	688	{
	689	.id = 0x00041180,
	690	.mask = 0x000fffff,
	691	},
	692	{
	693	.id = 0x00041181,
	694	.mask = 0x000fffff,
	695	},
	696	{ 0, 0 },
	697	};
	698
	699	static struct amba_driver mmci_driver = {
	700	.drv = {
	701	.name = DRIVER_NAME,
	702	},
	703	.probe = mmci_probe,
	704	.remove = mmci_remove,
	705	.suspend = mmci_suspend,
	706	.resume = mmci_resume,
	707	.id_table = mmci_ids,
	708	};
	709
	710	static int __init mmci_init(void)
	711	{
	712	return amba_driver_register(&mmci_driver);
	713	}
	714
	715	static void __exit mmci_exit(void)
716	{
717	amba_driver_unregister(&mmci_driver);
718	}
719
720	module_init(mmci_init);
721	module_exit(mmci_exit);
722	module_param(fmax, uint, 0444);
723
724	MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
725	MODULE_LICENSE("GPL");