[mirror_ubuntu-zesty-kernel.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/mmc/host.h>
#include <linux/amba/bus.h>
#include <linux/clk.h>

#include <asm/cacheflush.h>
#include <asm/div64.h>
#include <asm/io.h>
#include <asm/scatterlist.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(host->sg_ptr->page);
	}
	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;

	do {
		int count = host->size - (readl(base + MMCIFIFOCNT) << 2);

		if (count > remain)
			count = remain;

		if (count <= 0)
			break;

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

		ptr += count;
		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(host->sg_ptr->page);

		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);

	WARN_ON(host->mrq != NULL);

	if (mrq->data && (hweight32(mrq->data->blksz) > 1)) {
		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_irq(&host->lock);

	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_irq(&host->lock);
}

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, "MCLK");
	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);
	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;
	mmc->caps = MMC_CAP_MULTIWRITE;

	/*
	 * 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>
	19	#include <linux/mmc/host.h>
a62c80e5	20	#include <linux/amba/bus.h>
f8ce2547	21	#include <linux/clk.h>
1da177e4	22
e9c091b4	23	#include <asm/cacheflush.h>
7b09cdac	24	#include <asm/div64.h>
1da177e4	25	#include <asm/io.h>
1da177e4	26	#include <asm/scatterlist.h>
c6b8fdad	27	#include <asm/sizes.h>
1da177e4 LT	28	#include <asm/mach/mmc.h>
	29
	30	#include "mmci.h"
	31
	32	#define DRIVER_NAME "mmci-pl18x"
	33
1da177e4	34	#define DBG(host,fmt,args...) \
d366b643	35	pr_debug("%s: %s: " fmt, mmc_hostname(host->mmc), __func__ , args)
1da177e4 LT	36
	37	static unsigned int fmax = 515633;
	38
	39	static void
	40	mmci_request_end(struct mmci_host host, struct mmc_request mrq)
	41	{
	42	writel(0, host->base + MMCICOMMAND);
	43
e47c222b RK	44	BUG_ON(host->data);
e47c222b RK	45
1da177e4 LT	46	host->mrq = NULL;
	47	host->cmd = NULL;
	48
	49	if (mrq->data)
	50	mrq->data->bytes_xfered = host->data_xfered;
	51
	52	/*
	53	* Need to drop the host lock here; mmc_request_done may call
	54	* back into the driver...
	55	*/
	56	spin_unlock(&host->lock);
	57	mmc_request_done(host->mmc, mrq);
	58	spin_lock(&host->lock);
	59	}
	60
	61	static void mmci_stop_data(struct mmci_host *host)
	62	{
	63	writel(0, host->base + MMCIDATACTRL);
	64	writel(0, host->base + MMCIMASK1);
	65	host->data = NULL;
	66	}
	67
	68	static void mmci_start_data(struct mmci_host host, struct mmc_data data)
	69	{
	70	unsigned int datactrl, timeout, irqmask;
7b09cdac	71	unsigned long long clks;
1da177e4	72	void __iomem *base;
3bc87f24	73	int blksz_bits;
1da177e4 LT	74
1da177e4 LT	75	DBG(host, "blksz %04x blks %04x flags %08x\n",
3bc87f24	76	data->blksz, data->blocks, data->flags);
1da177e4 LT	77
1da177e4 LT	78	host->data = data;
3bc87f24	79	host->size = data->blksz;
1da177e4 LT	80	host->data_xfered = 0;
	81
	82	mmci_init_sg(host, data);
	83
7b09cdac RK	84	clks = (unsigned long long)data->timeout_ns * host->cclk;
	85	do_div(clks, 1000000000UL);
	86
	87	timeout = data->timeout_clks + (unsigned int)clks;
1da177e4 LT	88
	89	base = host->base;
	90	writel(timeout, base + MMCIDATATIMER);
	91	writel(host->size, base + MMCIDATALENGTH);
	92
3bc87f24 RK	93	blksz_bits = ffs(data->blksz) - 1;
	94	BUG_ON(1 << blksz_bits != data->blksz);
	95
	96	datactrl = MCI_DPSM_ENABLE \| blksz_bits << 4;
1da177e4 LT	97	if (data->flags & MMC_DATA_READ) {
	98	datactrl \|= MCI_DPSM_DIRECTION;
	99	irqmask = MCI_RXFIFOHALFFULLMASK;
0425a142 RK	100
	101	/*
	102	* If we have less than a FIFOSIZE of bytes to transfer,
	103	* trigger a PIO interrupt as soon as any data is available.
	104	*/
	105	if (host->size < MCI_FIFOSIZE)
	106	irqmask \|= MCI_RXDATAAVLBLMASK;
1da177e4 LT	107	} else {
	108	/*
	109	* We don't actually need to include "FIFO empty" here
	110	* since its implicit in "FIFO half empty".
	111	*/
	112	irqmask = MCI_TXFIFOHALFEMPTYMASK;
	113	}
	114
	115	writel(datactrl, base + MMCIDATACTRL);
	116	writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
	117	writel(irqmask, base + MMCIMASK1);
	118	}
	119
	120	static void
	121	mmci_start_command(struct mmci_host host, struct mmc_command cmd, u32 c)
	122	{
	123	void __iomem *base = host->base;
	124
	125	DBG(host, "op %02x arg %08x flags %08x\n",
	126	cmd->opcode, cmd->arg, cmd->flags);
	127
	128	if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
	129	writel(0, base + MMCICOMMAND);
	130	udelay(1);
	131	}
	132
	133	c \|= cmd->opcode \| MCI_CPSM_ENABLE;
e9225176 RK	134	if (cmd->flags & MMC_RSP_PRESENT) {
	135	if (cmd->flags & MMC_RSP_136)
	136	c \|= MCI_CPSM_LONGRSP;
1da177e4	137	c \|= MCI_CPSM_RESPONSE;
1da177e4 LT	138	}
	139	if (/interrupt/0)
	140	c \|= MCI_CPSM_INTERRUPT;
	141
	142	host->cmd = cmd;
	143
	144	writel(cmd->arg, base + MMCIARGUMENT);
	145	writel(c, base + MMCICOMMAND);
	146	}
	147
	148	static void
	149	mmci_data_irq(struct mmci_host host, struct mmc_data data,
	150	unsigned int status)
	151	{
	152	if (status & MCI_DATABLOCKEND) {
3bc87f24	153	host->data_xfered += data->blksz;
1da177e4 LT	154	}
	155	if (status & (MCI_DATACRCFAIL\|MCI_DATATIMEOUT\|MCI_TXUNDERRUN\|MCI_RXOVERRUN)) {
	156	if (status & MCI_DATACRCFAIL)
17b0429d	157	data->error = -EILSEQ;
1da177e4	158	else if (status & MCI_DATATIMEOUT)
17b0429d	159	data->error = -ETIMEDOUT;
1da177e4	160	else if (status & (MCI_TXUNDERRUN\|MCI_RXOVERRUN))
17b0429d	161	data->error = -EIO;
1da177e4	162	status \|= MCI_DATAEND;
e9c091b4 RK	163
	164	/*
	165	* We hit an error condition. Ensure that any data
	166	* partially written to a page is properly coherent.
	167	*/
	168	if (host->sg_len && data->flags & MMC_DATA_READ)
	169	flush_dcache_page(host->sg_ptr->page);
1da177e4 LT	170	}
	171	if (status & MCI_DATAEND) {
	172	mmci_stop_data(host);
	173
	174	if (!data->stop) {
	175	mmci_request_end(host, data->mrq);
	176	} else {
	177	mmci_start_command(host, data->stop, 0);
	178	}
	179	}
	180	}
	181
	182	static void
	183	mmci_cmd_irq(struct mmci_host host, struct mmc_command cmd,
	184	unsigned int status)
	185	{
	186	void __iomem *base = host->base;
	187
	188	host->cmd = NULL;
	189
	190	cmd->resp[0] = readl(base + MMCIRESPONSE0);
	191	cmd->resp[1] = readl(base + MMCIRESPONSE1);
	192	cmd->resp[2] = readl(base + MMCIRESPONSE2);
	193	cmd->resp[3] = readl(base + MMCIRESPONSE3);
	194
	195	if (status & MCI_CMDTIMEOUT) {
17b0429d	196	cmd->error = -ETIMEDOUT;
1da177e4	197	} else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
17b0429d	198	cmd->error = -EILSEQ;
1da177e4 LT	199	}
1da177e4 LT	200
17b0429d	201	if (!cmd->data \|\| cmd->error) {
e47c222b RK	202	if (host->data)
e47c222b RK	203	mmci_stop_data(host);
1da177e4 LT	204	mmci_request_end(host, cmd->mrq);
	205	} else if (!(cmd->data->flags & MMC_DATA_READ)) {
	206	mmci_start_data(host, cmd->data);
	207	}
	208	}
	209
	210	static int mmci_pio_read(struct mmci_host host, char buffer, unsigned int remain)
	211	{
	212	void __iomem *base = host->base;
	213	char *ptr = buffer;
	214	u32 status;
	215
	216	do {
	217	int count = host->size - (readl(base + MMCIFIFOCNT) << 2);
	218
	219	if (count > remain)
	220	count = remain;
	221
	222	if (count <= 0)
	223	break;
	224
	225	readsl(base + MMCIFIFO, ptr, count >> 2);
	226
	227	ptr += count;
	228	remain -= count;
	229
	230	if (remain == 0)
	231	break;
	232
	233	status = readl(base + MMCISTATUS);
	234	} while (status & MCI_RXDATAAVLBL);
	235
	236	return ptr - buffer;
	237	}
	238
	239	static int mmci_pio_write(struct mmci_host host, char buffer, unsigned int remain, u32 status)
	240	{
	241	void __iomem *base = host->base;
	242	char *ptr = buffer;
	243
	244	do {
	245	unsigned int count, maxcnt;
	246
	247	maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE;
	248	count = min(remain, maxcnt);
	249
	250	writesl(base + MMCIFIFO, ptr, count >> 2);
	251
	252	ptr += count;
	253	remain -= count;
	254
	255	if (remain == 0)
	256	break;
	257
	258	status = readl(base + MMCISTATUS);
	259	} while (status & MCI_TXFIFOHALFEMPTY);
	260
	261	return ptr - buffer;
	262	}
	263
	264	/*
	265	* PIO data transfer IRQ handler.
	266	*/
7d12e780	267	static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
1da177e4 LT	268	{
	269	struct mmci_host *host = dev_id;
	270	void __iomem *base = host->base;
	271	u32 status;
	272
	273	status = readl(base + MMCISTATUS);
	274
	275	DBG(host, "irq1 %08x\n", status);
	276
	277	do {
	278	unsigned long flags;
	279	unsigned int remain, len;
	280	char *buffer;
	281
	282	/*
	283	* For write, we only need to test the half-empty flag
	284	* here - if the FIFO is completely empty, then by
	285	* definition it is more than half empty.
	286	*
	287	* For read, check for data available.
	288	*/
	289	if (!(status & (MCI_TXFIFOHALFEMPTY\|MCI_RXDATAAVLBL)))
	290	break;
	291
	292	/*
	293	* Map the current scatter buffer.
	294	*/
	295	buffer = mmci_kmap_atomic(host, &flags) + host->sg_off;
	296	remain = host->sg_ptr->length - host->sg_off;
	297
	298	len = 0;
	299	if (status & MCI_RXACTIVE)
	300	len = mmci_pio_read(host, buffer, remain);
	301	if (status & MCI_TXACTIVE)
	302	len = mmci_pio_write(host, buffer, remain, status);
	303
	304	/*
	305	* Unmap the buffer.
	306	*/
f3e2628b	307	mmci_kunmap_atomic(host, buffer, &flags);
1da177e4 LT	308
	309	host->sg_off += len;
	310	host->size -= len;
	311	remain -= len;
	312
	313	if (remain)
	314	break;
	315
e9c091b4 RK	316	/*
	317	* If we were reading, and we have completed this
	318	* page, ensure that the data cache is coherent.
	319	*/
	320	if (status & MCI_RXACTIVE)
	321	flush_dcache_page(host->sg_ptr->page);
	322
1da177e4 LT	323	if (!mmci_next_sg(host))
	324	break;
	325
	326	status = readl(base + MMCISTATUS);
	327	} while (1);
	328
	329	/*
	330	* If we're nearing the end of the read, switch to
	331	* "any data available" mode.
	332	*/
	333	if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE)
	334	writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
	335
	336	/*
	337	* If we run out of data, disable the data IRQs; this
	338	* prevents a race where the FIFO becomes empty before
	339	* the chip itself has disabled the data path, and
	340	* stops us racing with our data end IRQ.
	341	*/
	342	if (host->size == 0) {
	343	writel(0, base + MMCIMASK1);
	344	writel(readl(base + MMCIMASK0) \| MCI_DATAENDMASK, base + MMCIMASK0);
	345	}
	346
	347	return IRQ_HANDLED;
	348	}
	349
	350	/*
	351	* Handle completion of command and data transfers.
	352	*/
7d12e780	353	static irqreturn_t mmci_irq(int irq, void *dev_id)
1da177e4 LT	354	{
	355	struct mmci_host *host = dev_id;
	356	u32 status;
	357	int ret = 0;
	358
	359	spin_lock(&host->lock);
	360
	361	do {
	362	struct mmc_command *cmd;
	363	struct mmc_data *data;
	364
	365	status = readl(host->base + MMCISTATUS);
	366	status &= readl(host->base + MMCIMASK0);
	367	writel(status, host->base + MMCICLEAR);
	368
	369	DBG(host, "irq0 %08x\n", status);
	370
	371	data = host->data;
	372	if (status & (MCI_DATACRCFAIL\|MCI_DATATIMEOUT\|MCI_TXUNDERRUN\|
	373	MCI_RXOVERRUN\|MCI_DATAEND\|MCI_DATABLOCKEND) && data)
	374	mmci_data_irq(host, data, status);
	375
	376	cmd = host->cmd;
	377	if (status & (MCI_CMDCRCFAIL\|MCI_CMDTIMEOUT\|MCI_CMDSENT\|MCI_CMDRESPEND) && cmd)
	378	mmci_cmd_irq(host, cmd, status);
	379
	380	ret = 1;
	381	} while (status);
	382
	383	spin_unlock(&host->lock);
	384
	385	return IRQ_RETVAL(ret);
	386	}
	387
	388	static void mmci_request(struct mmc_host mmc, struct mmc_request mrq)
	389	{
	390	struct mmci_host *host = mmc_priv(mmc);
	391
	392	WARN_ON(host->mrq != NULL);
	393
255d01af PO	394	if (mrq->data && (hweight32(mrq->data->blksz) > 1)) {
	395	printk(KERN_ERR "%s: Unsupported block size (%d bytes)\n",
	396	mmc_hostname(mmc), mrq->data->blksz);
	397	mrq->cmd->error = -EINVAL;
	398	mmc_request_done(mmc, mrq);
	399	return;
	400	}
	401
1da177e4 LT	402	spin_lock_irq(&host->lock);
	403
	404	host->mrq = mrq;
	405
	406	if (mrq->data && mrq->data->flags & MMC_DATA_READ)
	407	mmci_start_data(host, mrq->data);
	408
	409	mmci_start_command(host, mrq->cmd, 0);
	410
	411	spin_unlock_irq(&host->lock);
	412	}
	413
	414	static void mmci_set_ios(struct mmc_host mmc, struct mmc_ios ios)
	415	{
	416	struct mmci_host *host = mmc_priv(mmc);
	417	u32 clk = 0, pwr = 0;
	418
1da177e4 LT	419	if (ios->clock) {
	420	if (ios->clock >= host->mclk) {
	421	clk = MCI_CLK_BYPASS;
	422	host->cclk = host->mclk;
	423	} else {
	424	clk = host->mclk / (2 * ios->clock) - 1;
	425	if (clk > 256)
	426	clk = 255;
	427	host->cclk = host->mclk / (2 * (clk + 1));
	428	}
	429	clk \|= MCI_CLK_ENABLE;
	430	}
	431
	432	if (host->plat->translate_vdd)
	433	pwr \|= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
	434
	435	switch (ios->power_mode) {
	436	case MMC_POWER_OFF:
	437	break;
	438	case MMC_POWER_UP:
	439	pwr \|= MCI_PWR_UP;
	440	break;
	441	case MMC_POWER_ON:
	442	pwr \|= MCI_PWR_ON;
	443	break;
	444	}
	445
	446	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
	447	pwr \|= MCI_ROD;
	448
	449	writel(clk, host->base + MMCICLOCK);
	450
	451	if (host->pwr != pwr) {
	452	host->pwr = pwr;
	453	writel(pwr, host->base + MMCIPOWER);
	454	}
	455	}
	456
ab7aefd0	457	static const struct mmc_host_ops mmci_ops = {
1da177e4 LT	458	.request = mmci_request,
	459	.set_ios = mmci_set_ios,
	460	};
	461
	462	static void mmci_check_status(unsigned long data)
	463	{
	464	struct mmci_host host = (struct mmci_host )data;
	465	unsigned int status;
	466
	467	status = host->plat->status(mmc_dev(host->mmc));
	468	if (status ^ host->oldstat)
8dc00335	469	mmc_detect_change(host->mmc, 0);
1da177e4 LT	470
	471	host->oldstat = status;
	472	mod_timer(&host->timer, jiffies + HZ);
	473	}
	474
	475	static int mmci_probe(struct amba_device dev, void id)
	476	{
	477	struct mmc_platform_data *plat = dev->dev.platform_data;
	478	struct mmci_host *host;
	479	struct mmc_host *mmc;
	480	int ret;
	481
	482	/* must have platform data */
	483	if (!plat) {
	484	ret = -EINVAL;
	485	goto out;
	486	}
	487
	488	ret = amba_request_regions(dev, DRIVER_NAME);
	489	if (ret)
	490	goto out;
	491
	492	mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
	493	if (!mmc) {
	494	ret = -ENOMEM;
	495	goto rel_regions;
	496	}
	497
	498	host = mmc_priv(mmc);
	499	host->clk = clk_get(&dev->dev, "MCLK");
	500	if (IS_ERR(host->clk)) {
	501	ret = PTR_ERR(host->clk);
	502	host->clk = NULL;
	503	goto host_free;
	504	}
	505
1da177e4 LT	506	ret = clk_enable(host->clk);
1da177e4 LT	507	if (ret)
a8d3584a	508	goto clk_free;
1da177e4 LT	509
	510	host->plat = plat;
	511	host->mclk = clk_get_rate(host->clk);
	512	host->mmc = mmc;
	513	host->base = ioremap(dev->res.start, SZ_4K);
	514	if (!host->base) {
	515	ret = -ENOMEM;
	516	goto clk_disable;
	517	}
	518
	519	mmc->ops = &mmci_ops;
	520	mmc->f_min = (host->mclk + 511) / 512;
	521	mmc->f_max = min(host->mclk, fmax);
	522	mmc->ocr_avail = plat->ocr_mask;
db53f28b	523	mmc->caps = MMC_CAP_MULTIWRITE;
1da177e4 LT	524
	525	/*
	526	* We can do SGIO
	527	*/
	528	mmc->max_hw_segs = 16;
	529	mmc->max_phys_segs = NR_SG;
	530
	531	/*
	532	* Since we only have a 16-bit data length register, we must
	533	* ensure that we don't exceed 2^16-1 bytes in a single request.
1da177e4	534	*/
55db890a	535	mmc->max_req_size = 65535;
1da177e4 LT	536
	537	/*
	538	* Set the maximum segment size. Since we aren't doing DMA
	539	* (yet) we are only limited by the data length register.
	540	*/
55db890a	541	mmc->max_seg_size = mmc->max_req_size;
1da177e4	542
fe4a3c7a PO	543	/*
	544	* Block size can be up to 2048 bytes, but must be a power of two.
	545	*/
	546	mmc->max_blk_size = 2048;
	547
55db890a PO	548	/*
	549	* No limit on the number of blocks transferred.
	550	*/
	551	mmc->max_blk_count = mmc->max_req_size;
	552
1da177e4 LT	553	spin_lock_init(&host->lock);
	554
	555	writel(0, host->base + MMCIMASK0);
	556	writel(0, host->base + MMCIMASK1);
	557	writel(0xfff, host->base + MMCICLEAR);
	558
dace1453	559	ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host);
1da177e4 LT	560	if (ret)
	561	goto unmap;
	562
dace1453	563	ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, DRIVER_NAME " (pio)", host);
1da177e4 LT	564	if (ret)
	565	goto irq0_free;
	566
	567	writel(MCI_IRQENABLE, host->base + MMCIMASK0);
	568
	569	amba_set_drvdata(dev, mmc);
	570
	571	mmc_add_host(mmc);
	572
e29419ff	573	printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%016llx irq %d,%d\n",
d366b643	574	mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
e29419ff	575	(unsigned long long)dev->res.start, dev->irq[0], dev->irq[1]);
1da177e4 LT	576
	577	init_timer(&host->timer);
	578	host->timer.data = (unsigned long)host;
	579	host->timer.function = mmci_check_status;
	580	host->timer.expires = jiffies + HZ;
	581	add_timer(&host->timer);
	582
	583	return 0;
	584
	585	irq0_free:
	586	free_irq(dev->irq[0], host);
	587	unmap:
	588	iounmap(host->base);
	589	clk_disable:
	590	clk_disable(host->clk);
1da177e4 LT	591	clk_free:
	592	clk_put(host->clk);
	593	host_free:
	594	mmc_free_host(mmc);
	595	rel_regions:
	596	amba_release_regions(dev);
	597	out:
	598	return ret;
	599	}
	600
	601	static int mmci_remove(struct amba_device *dev)
	602	{
	603	struct mmc_host *mmc = amba_get_drvdata(dev);
	604
	605	amba_set_drvdata(dev, NULL);
	606
	607	if (mmc) {
	608	struct mmci_host *host = mmc_priv(mmc);
	609
	610	del_timer_sync(&host->timer);
	611
	612	mmc_remove_host(mmc);
	613
	614	writel(0, host->base + MMCIMASK0);
	615	writel(0, host->base + MMCIMASK1);
	616
	617	writel(0, host->base + MMCICOMMAND);
	618	writel(0, host->base + MMCIDATACTRL);
	619
	620	free_irq(dev->irq[0], host);
	621	free_irq(dev->irq[1], host);
	622
	623	iounmap(host->base);
	624	clk_disable(host->clk);
1da177e4 LT	625	clk_put(host->clk);
	626
	627	mmc_free_host(mmc);
	628
	629	amba_release_regions(dev);
	630	}
	631
	632	return 0;
	633	}
	634
	635	#ifdef CONFIG_PM
e5378ca8	636	static int mmci_suspend(struct amba_device *dev, pm_message_t state)
1da177e4 LT	637	{
	638	struct mmc_host *mmc = amba_get_drvdata(dev);
	639	int ret = 0;
	640
	641	if (mmc) {
	642	struct mmci_host *host = mmc_priv(mmc);
	643
	644	ret = mmc_suspend_host(mmc, state);
	645	if (ret == 0)
	646	writel(0, host->base + MMCIMASK0);
	647	}
	648
	649	return ret;
	650	}
	651
	652	static int mmci_resume(struct amba_device *dev)
	653	{
	654	struct mmc_host *mmc = amba_get_drvdata(dev);
	655	int ret = 0;
	656
	657	if (mmc) {
	658	struct mmci_host *host = mmc_priv(mmc);
	659
	660	writel(MCI_IRQENABLE, host->base + MMCIMASK0);
	661
	662	ret = mmc_resume_host(mmc);
	663	}
	664
	665	return ret;
	666	}
	667	#else
	668	#define mmci_suspend NULL
	669	#define mmci_resume NULL
	670	#endif
	671
	672	static struct amba_id mmci_ids[] = {
	673	{
	674	.id = 0x00041180,
	675	.mask = 0x000fffff,
	676	},
	677	{
	678	.id = 0x00041181,
	679	.mask = 0x000fffff,
	680	},
	681	{ 0, 0 },
	682	};
	683
	684	static struct amba_driver mmci_driver = {
	685	.drv = {
	686	.name = DRIVER_NAME,
	687	},
	688	.probe = mmci_probe,
	689	.remove = mmci_remove,
	690	.suspend = mmci_suspend,
	691	.resume = mmci_resume,
	692	.id_table = mmci_ids,
	693	};
	694
	695	static int __init mmci_init(void)
	696	{
	697	return amba_driver_register(&mmci_driver);
	698	}
	699
	700	static void __exit mmci_exit(void)
701	{
702	amba_driver_unregister(&mmci_driver);
703	}
704
705	module_init(mmci_init);
706	module_exit(mmci_exit);
707	module_param(fmax, uint, 0444);
708
709	MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
710	MODULE_LICENSE("GPL");