[net-next-2.6.git] / drivers / mmc / mmci.c

/*
 *  linux/drivers/mmc/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/mmc/protocol.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);

	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 = MMC_ERR_BADCRC;
		else if (status & MCI_DATATIMEOUT)
			data->error = MMC_ERR_TIMEOUT;
		else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
			data->error = MMC_ERR_FIFO;
		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 = MMC_ERR_TIMEOUT;
	} else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
		cmd->error = MMC_ERR_BADCRC;
	}

	if (!cmd->data || cmd->error != MMC_ERR_NONE) {
		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);

	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 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.
	 * Choose 64 (512-byte) sectors as the limit.
	 */
	mmc->max_sectors = 64;

	/*
	 * 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_sectors << 9;

	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 LT	1	/*
	2	* linux/drivers/mmc/mmci.c - ARM PrimeCell MMCI PL180/1 driver
	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>
	20	#include <linux/mmc/protocol.h>
a62c80e5	21	#include <linux/amba/bus.h>
f8ce2547	22	#include <linux/clk.h>
1da177e4	23
e9c091b4	24	#include <asm/cacheflush.h>
7b09cdac	25	#include <asm/div64.h>
1da177e4	26	#include <asm/io.h>
1da177e4	27	#include <asm/scatterlist.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
	45	host->mrq = NULL;
	46	host->cmd = NULL;
	47
	48	if (mrq->data)
	49	mrq->data->bytes_xfered = host->data_xfered;
	50
	51	/*
	52	* Need to drop the host lock here; mmc_request_done may call
	53	* back into the driver...
	54	*/
	55	spin_unlock(&host->lock);
	56	mmc_request_done(host->mmc, mrq);
	57	spin_lock(&host->lock);
	58	}
	59
	60	static void mmci_stop_data(struct mmci_host *host)
	61	{
	62	writel(0, host->base + MMCIDATACTRL);
	63	writel(0, host->base + MMCIMASK1);
	64	host->data = NULL;
	65	}
	66
	67	static void mmci_start_data(struct mmci_host host, struct mmc_data data)
	68	{
	69	unsigned int datactrl, timeout, irqmask;
7b09cdac	70	unsigned long long clks;
1da177e4	71	void __iomem *base;
3bc87f24	72	int blksz_bits;
1da177e4 LT	73
1da177e4 LT	74	DBG(host, "blksz %04x blks %04x flags %08x\n",
3bc87f24	75	data->blksz, data->blocks, data->flags);
1da177e4 LT	76
1da177e4 LT	77	host->data = data;
3bc87f24	78	host->size = data->blksz;
1da177e4 LT	79	host->data_xfered = 0;
	80
	81	mmci_init_sg(host, data);
	82
7b09cdac RK	83	clks = (unsigned long long)data->timeout_ns * host->cclk;
	84	do_div(clks, 1000000000UL);
	85
	86	timeout = data->timeout_clks + (unsigned int)clks;
1da177e4 LT	87
	88	base = host->base;
	89	writel(timeout, base + MMCIDATATIMER);
	90	writel(host->size, base + MMCIDATALENGTH);
	91
3bc87f24 RK	92	blksz_bits = ffs(data->blksz) - 1;
	93	BUG_ON(1 << blksz_bits != data->blksz);
	94
	95	datactrl = MCI_DPSM_ENABLE \| blksz_bits << 4;
1da177e4 LT	96	if (data->flags & MMC_DATA_READ) {
	97	datactrl \|= MCI_DPSM_DIRECTION;
	98	irqmask = MCI_RXFIFOHALFFULLMASK;
0425a142 RK	99
	100	/*
	101	* If we have less than a FIFOSIZE of bytes to transfer,
	102	* trigger a PIO interrupt as soon as any data is available.
	103	*/
	104	if (host->size < MCI_FIFOSIZE)
	105	irqmask \|= MCI_RXDATAAVLBLMASK;
1da177e4 LT	106	} else {
	107	/*
	108	* We don't actually need to include "FIFO empty" here
	109	* since its implicit in "FIFO half empty".
	110	*/
	111	irqmask = MCI_TXFIFOHALFEMPTYMASK;
	112	}
	113
	114	writel(datactrl, base + MMCIDATACTRL);
	115	writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
	116	writel(irqmask, base + MMCIMASK1);
	117	}
	118
	119	static void
	120	mmci_start_command(struct mmci_host host, struct mmc_command cmd, u32 c)
	121	{
	122	void __iomem *base = host->base;
	123
	124	DBG(host, "op %02x arg %08x flags %08x\n",
	125	cmd->opcode, cmd->arg, cmd->flags);
	126
	127	if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
	128	writel(0, base + MMCICOMMAND);
	129	udelay(1);
	130	}
	131
	132	c \|= cmd->opcode \| MCI_CPSM_ENABLE;
e9225176 RK	133	if (cmd->flags & MMC_RSP_PRESENT) {
	134	if (cmd->flags & MMC_RSP_136)
	135	c \|= MCI_CPSM_LONGRSP;
1da177e4	136	c \|= MCI_CPSM_RESPONSE;
1da177e4 LT	137	}
	138	if (/interrupt/0)
	139	c \|= MCI_CPSM_INTERRUPT;
	140
	141	host->cmd = cmd;
	142
	143	writel(cmd->arg, base + MMCIARGUMENT);
	144	writel(c, base + MMCICOMMAND);
	145	}
	146
	147	static void
	148	mmci_data_irq(struct mmci_host host, struct mmc_data data,
	149	unsigned int status)
	150	{
	151	if (status & MCI_DATABLOCKEND) {
3bc87f24	152	host->data_xfered += data->blksz;
1da177e4 LT	153	}
	154	if (status & (MCI_DATACRCFAIL\|MCI_DATATIMEOUT\|MCI_TXUNDERRUN\|MCI_RXOVERRUN)) {
	155	if (status & MCI_DATACRCFAIL)
	156	data->error = MMC_ERR_BADCRC;
	157	else if (status & MCI_DATATIMEOUT)
	158	data->error = MMC_ERR_TIMEOUT;
	159	else if (status & (MCI_TXUNDERRUN\|MCI_RXOVERRUN))
	160	data->error = MMC_ERR_FIFO;
	161	status \|= MCI_DATAEND;
e9c091b4 RK	162
	163	/*
	164	* We hit an error condition. Ensure that any data
	165	* partially written to a page is properly coherent.
	166	*/
	167	if (host->sg_len && data->flags & MMC_DATA_READ)
	168	flush_dcache_page(host->sg_ptr->page);
1da177e4 LT	169	}
	170	if (status & MCI_DATAEND) {
	171	mmci_stop_data(host);
	172
	173	if (!data->stop) {
	174	mmci_request_end(host, data->mrq);
	175	} else {
	176	mmci_start_command(host, data->stop, 0);
	177	}
	178	}
	179	}
	180
	181	static void
	182	mmci_cmd_irq(struct mmci_host host, struct mmc_command cmd,
	183	unsigned int status)
	184	{
	185	void __iomem *base = host->base;
	186
	187	host->cmd = NULL;
	188
	189	cmd->resp[0] = readl(base + MMCIRESPONSE0);
	190	cmd->resp[1] = readl(base + MMCIRESPONSE1);
	191	cmd->resp[2] = readl(base + MMCIRESPONSE2);
	192	cmd->resp[3] = readl(base + MMCIRESPONSE3);
	193
	194	if (status & MCI_CMDTIMEOUT) {
	195	cmd->error = MMC_ERR_TIMEOUT;
	196	} else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
	197	cmd->error = MMC_ERR_BADCRC;
	198	}
	199
	200	if (!cmd->data \|\| cmd->error != MMC_ERR_NONE) {
	201	mmci_request_end(host, cmd->mrq);
	202	} else if (!(cmd->data->flags & MMC_DATA_READ)) {
	203	mmci_start_data(host, cmd->data);
	204	}
	205	}
	206
	207	static int mmci_pio_read(struct mmci_host host, char buffer, unsigned int remain)
	208	{
	209	void __iomem *base = host->base;
	210	char *ptr = buffer;
	211	u32 status;
	212
	213	do {
	214	int count = host->size - (readl(base + MMCIFIFOCNT) << 2);
	215
	216	if (count > remain)
	217	count = remain;
	218
	219	if (count <= 0)
	220	break;
	221
	222	readsl(base + MMCIFIFO, ptr, count >> 2);
	223
	224	ptr += count;
	225	remain -= count;
	226
	227	if (remain == 0)
	228	break;
	229
	230	status = readl(base + MMCISTATUS);
	231	} while (status & MCI_RXDATAAVLBL);
	232
233	return ptr - buffer;
234	}
235
236	static int mmci_pio_write(struct mmci_host host, char buffer, unsigned int remain, u32 status)
237	{
238	void __iomem *base = host->base;
239	char *ptr = buffer;
240
241	do {
242	unsigned int count, maxcnt;
243
244	maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE;
245	count = min(remain, maxcnt);
246
247	writesl(base + MMCIFIFO, ptr, count >> 2);
248
249	ptr += count;
250	remain -= count;
251
252	if (remain == 0)
253	break;
254
255	status = readl(base + MMCISTATUS);
256	} while (status & MCI_TXFIFOHALFEMPTY);
257
258	return ptr - buffer;
259	}
260
261	/*
262	* PIO data transfer IRQ handler.
263	*/
7d12e780	264	static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
1da177e4 LT	265	{
	266	struct mmci_host *host = dev_id;
	267	void __iomem *base = host->base;
	268	u32 status;
	269
	270	status = readl(base + MMCISTATUS);
	271
	272	DBG(host, "irq1 %08x\n", status);
	273
	274	do {
	275	unsigned long flags;
	276	unsigned int remain, len;
	277	char *buffer;
	278
	279	/*
	280	* For write, we only need to test the half-empty flag
	281	* here - if the FIFO is completely empty, then by
	282	* definition it is more than half empty.
	283	*
	284	* For read, check for data available.
	285	*/
	286	if (!(status & (MCI_TXFIFOHALFEMPTY\|MCI_RXDATAAVLBL)))
	287	break;
	288
	289	/*
	290	* Map the current scatter buffer.
	291	*/
	292	buffer = mmci_kmap_atomic(host, &flags) + host->sg_off;
	293	remain = host->sg_ptr->length - host->sg_off;
	294
	295	len = 0;
	296	if (status & MCI_RXACTIVE)
	297	len = mmci_pio_read(host, buffer, remain);
	298	if (status & MCI_TXACTIVE)
	299	len = mmci_pio_write(host, buffer, remain, status);
	300
	301	/*
	302	* Unmap the buffer.
	303	*/
f3e2628b	304	mmci_kunmap_atomic(host, buffer, &flags);
1da177e4 LT	305
	306	host->sg_off += len;
	307	host->size -= len;
	308	remain -= len;
	309
	310	if (remain)
	311	break;
	312
e9c091b4 RK	313	/*
	314	* If we were reading, and we have completed this
	315	* page, ensure that the data cache is coherent.
	316	*/
	317	if (status & MCI_RXACTIVE)
	318	flush_dcache_page(host->sg_ptr->page);
	319
1da177e4 LT	320	if (!mmci_next_sg(host))
	321	break;
	322
	323	status = readl(base + MMCISTATUS);
	324	} while (1);
	325
	326	/*
	327	* If we're nearing the end of the read, switch to
	328	* "any data available" mode.
	329	*/
	330	if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE)
	331	writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
	332
	333	/*
	334	* If we run out of data, disable the data IRQs; this
	335	* prevents a race where the FIFO becomes empty before
	336	* the chip itself has disabled the data path, and
	337	* stops us racing with our data end IRQ.
	338	*/
	339	if (host->size == 0) {
	340	writel(0, base + MMCIMASK1);
	341	writel(readl(base + MMCIMASK0) \| MCI_DATAENDMASK, base + MMCIMASK0);
	342	}
	343
	344	return IRQ_HANDLED;
	345	}
	346
	347	/*
	348	* Handle completion of command and data transfers.
	349	*/
7d12e780	350	static irqreturn_t mmci_irq(int irq, void *dev_id)
1da177e4 LT	351	{
	352	struct mmci_host *host = dev_id;
	353	u32 status;
	354	int ret = 0;
	355
	356	spin_lock(&host->lock);
	357
	358	do {
	359	struct mmc_command *cmd;
	360	struct mmc_data *data;
	361
	362	status = readl(host->base + MMCISTATUS);
	363	status &= readl(host->base + MMCIMASK0);
	364	writel(status, host->base + MMCICLEAR);
	365
	366	DBG(host, "irq0 %08x\n", status);
	367
	368	data = host->data;
	369	if (status & (MCI_DATACRCFAIL\|MCI_DATATIMEOUT\|MCI_TXUNDERRUN\|
	370	MCI_RXOVERRUN\|MCI_DATAEND\|MCI_DATABLOCKEND) && data)
	371	mmci_data_irq(host, data, status);
	372
	373	cmd = host->cmd;
	374	if (status & (MCI_CMDCRCFAIL\|MCI_CMDTIMEOUT\|MCI_CMDSENT\|MCI_CMDRESPEND) && cmd)
	375	mmci_cmd_irq(host, cmd, status);
	376
	377	ret = 1;
	378	} while (status);
	379
	380	spin_unlock(&host->lock);
	381
	382	return IRQ_RETVAL(ret);
	383	}
	384
	385	static void mmci_request(struct mmc_host mmc, struct mmc_request mrq)
	386	{
	387	struct mmci_host *host = mmc_priv(mmc);
	388
	389	WARN_ON(host->mrq != NULL);
	390
	391	spin_lock_irq(&host->lock);
	392
	393	host->mrq = mrq;
	394
	395	if (mrq->data && mrq->data->flags & MMC_DATA_READ)
	396	mmci_start_data(host, mrq->data);
	397
	398	mmci_start_command(host, mrq->cmd, 0);
	399
	400	spin_unlock_irq(&host->lock);
	401	}
	402
	403	static void mmci_set_ios(struct mmc_host mmc, struct mmc_ios ios)
	404	{
	405	struct mmci_host *host = mmc_priv(mmc);
	406	u32 clk = 0, pwr = 0;
	407
1da177e4 LT	408	if (ios->clock) {
	409	if (ios->clock >= host->mclk) {
	410	clk = MCI_CLK_BYPASS;
	411	host->cclk = host->mclk;
	412	} else {
	413	clk = host->mclk / (2 * ios->clock) - 1;
	414	if (clk > 256)
	415	clk = 255;
	416	host->cclk = host->mclk / (2 * (clk + 1));
	417	}
	418	clk \|= MCI_CLK_ENABLE;
	419	}
	420
	421	if (host->plat->translate_vdd)
	422	pwr \|= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
	423
	424	switch (ios->power_mode) {
	425	case MMC_POWER_OFF:
	426	break;
	427	case MMC_POWER_UP:
	428	pwr \|= MCI_PWR_UP;
	429	break;
	430	case MMC_POWER_ON:
	431	pwr \|= MCI_PWR_ON;
	432	break;
	433	}
	434
	435	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
	436	pwr \|= MCI_ROD;
	437
	438	writel(clk, host->base + MMCICLOCK);
	439
	440	if (host->pwr != pwr) {
	441	host->pwr = pwr;
	442	writel(pwr, host->base + MMCIPOWER);
	443	}
	444	}
	445
	446	static struct mmc_host_ops mmci_ops = {
	447	.request = mmci_request,
	448	.set_ios = mmci_set_ios,
	449	};
	450
	451	static void mmci_check_status(unsigned long data)
	452	{
	453	struct mmci_host host = (struct mmci_host )data;
	454	unsigned int status;
	455
	456	status = host->plat->status(mmc_dev(host->mmc));
	457	if (status ^ host->oldstat)
8dc00335	458	mmc_detect_change(host->mmc, 0);
1da177e4 LT	459
	460	host->oldstat = status;
	461	mod_timer(&host->timer, jiffies + HZ);
	462	}
	463
	464	static int mmci_probe(struct amba_device dev, void id)
	465	{
	466	struct mmc_platform_data *plat = dev->dev.platform_data;
	467	struct mmci_host *host;
	468	struct mmc_host *mmc;
	469	int ret;
	470
	471	/* must have platform data */
	472	if (!plat) {
	473	ret = -EINVAL;
	474	goto out;
	475	}
	476
	477	ret = amba_request_regions(dev, DRIVER_NAME);
	478	if (ret)
	479	goto out;
	480
	481	mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
	482	if (!mmc) {
	483	ret = -ENOMEM;
	484	goto rel_regions;
	485	}
	486
	487	host = mmc_priv(mmc);
	488	host->clk = clk_get(&dev->dev, "MCLK");
	489	if (IS_ERR(host->clk)) {
	490	ret = PTR_ERR(host->clk);
	491	host->clk = NULL;
	492	goto host_free;
	493	}
	494
1da177e4 LT	495	ret = clk_enable(host->clk);
1da177e4 LT	496	if (ret)
a8d3584a	497	goto clk_free;
1da177e4 LT	498
	499	host->plat = plat;
	500	host->mclk = clk_get_rate(host->clk);
	501	host->mmc = mmc;
	502	host->base = ioremap(dev->res.start, SZ_4K);
	503	if (!host->base) {
	504	ret = -ENOMEM;
	505	goto clk_disable;
	506	}
	507
	508	mmc->ops = &mmci_ops;
	509	mmc->f_min = (host->mclk + 511) / 512;
	510	mmc->f_max = min(host->mclk, fmax);
	511	mmc->ocr_avail = plat->ocr_mask;
db53f28b	512	mmc->caps = MMC_CAP_MULTIWRITE;
1da177e4 LT	513
	514	/*
	515	* We can do SGIO
	516	*/
	517	mmc->max_hw_segs = 16;
	518	mmc->max_phys_segs = NR_SG;
	519
	520	/*
	521	* Since we only have a 16-bit data length register, we must
	522	* ensure that we don't exceed 2^16-1 bytes in a single request.
	523	* Choose 64 (512-byte) sectors as the limit.
	524	*/
	525	mmc->max_sectors = 64;
	526
	527	/*
	528	* Set the maximum segment size. Since we aren't doing DMA
	529	* (yet) we are only limited by the data length register.
	530	*/
	531	mmc->max_seg_size = mmc->max_sectors << 9;
	532
	533	spin_lock_init(&host->lock);
	534
	535	writel(0, host->base + MMCIMASK0);
	536	writel(0, host->base + MMCIMASK1);
	537	writel(0xfff, host->base + MMCICLEAR);
	538
dace1453	539	ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host);
1da177e4 LT	540	if (ret)
	541	goto unmap;
	542
dace1453	543	ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, DRIVER_NAME " (pio)", host);
1da177e4 LT	544	if (ret)
	545	goto irq0_free;
	546
	547	writel(MCI_IRQENABLE, host->base + MMCIMASK0);
	548
	549	amba_set_drvdata(dev, mmc);
	550
	551	mmc_add_host(mmc);
	552
e29419ff	553	printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%016llx irq %d,%d\n",
d366b643	554	mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
e29419ff	555	(unsigned long long)dev->res.start, dev->irq[0], dev->irq[1]);
1da177e4 LT	556
	557	init_timer(&host->timer);
	558	host->timer.data = (unsigned long)host;
	559	host->timer.function = mmci_check_status;
	560	host->timer.expires = jiffies + HZ;
	561	add_timer(&host->timer);
	562
	563	return 0;
	564
	565	irq0_free:
	566	free_irq(dev->irq[0], host);
	567	unmap:
	568	iounmap(host->base);
	569	clk_disable:
	570	clk_disable(host->clk);
1da177e4 LT	571	clk_free:
	572	clk_put(host->clk);
	573	host_free:
	574	mmc_free_host(mmc);
	575	rel_regions:
	576	amba_release_regions(dev);
	577	out:
	578	return ret;
	579	}
	580
	581	static int mmci_remove(struct amba_device *dev)
	582	{
	583	struct mmc_host *mmc = amba_get_drvdata(dev);
	584
	585	amba_set_drvdata(dev, NULL);
	586
	587	if (mmc) {
	588	struct mmci_host *host = mmc_priv(mmc);
	589
	590	del_timer_sync(&host->timer);
	591
	592	mmc_remove_host(mmc);
	593
	594	writel(0, host->base + MMCIMASK0);
	595	writel(0, host->base + MMCIMASK1);
	596
	597	writel(0, host->base + MMCICOMMAND);
	598	writel(0, host->base + MMCIDATACTRL);
	599
	600	free_irq(dev->irq[0], host);
	601	free_irq(dev->irq[1], host);
	602
	603	iounmap(host->base);
	604	clk_disable(host->clk);
1da177e4 LT	605	clk_put(host->clk);
	606
	607	mmc_free_host(mmc);
	608
	609	amba_release_regions(dev);
	610	}
	611
	612	return 0;
	613	}
	614
	615	#ifdef CONFIG_PM
e5378ca8	616	static int mmci_suspend(struct amba_device *dev, pm_message_t state)
1da177e4 LT	617	{
	618	struct mmc_host *mmc = amba_get_drvdata(dev);
	619	int ret = 0;
	620
	621	if (mmc) {
	622	struct mmci_host *host = mmc_priv(mmc);
	623
	624	ret = mmc_suspend_host(mmc, state);
	625	if (ret == 0)
	626	writel(0, host->base + MMCIMASK0);
	627	}
	628
	629	return ret;
	630	}
	631
	632	static int mmci_resume(struct amba_device *dev)
	633	{
	634	struct mmc_host *mmc = amba_get_drvdata(dev);
	635	int ret = 0;
	636
	637	if (mmc) {
	638	struct mmci_host *host = mmc_priv(mmc);
	639
	640	writel(MCI_IRQENABLE, host->base + MMCIMASK0);
	641
	642	ret = mmc_resume_host(mmc);
	643	}
	644
	645	return ret;
	646	}
	647	#else
	648	#define mmci_suspend NULL
	649	#define mmci_resume NULL
	650	#endif
	651
	652	static struct amba_id mmci_ids[] = {
	653	{
	654	.id = 0x00041180,
	655	.mask = 0x000fffff,
	656	},
	657	{
	658	.id = 0x00041181,
	659	.mask = 0x000fffff,
	660	},
	661	{ 0, 0 },
	662	};
	663
	664	static struct amba_driver mmci_driver = {
	665	.drv = {
	666	.name = DRIVER_NAME,
	667	},
	668	.probe = mmci_probe,
	669	.remove = mmci_remove,
	670	.suspend = mmci_suspend,
	671	.resume = mmci_resume,
	672	.id_table = mmci_ids,
	673	};
	674
	675	static int __init mmci_init(void)
	676	{
	677	return amba_driver_register(&mmci_driver);
	678	}
	679
	680	static void __exit mmci_exit(void)
681	{
682	amba_driver_unregister(&mmci_driver);
683	}
684
685	module_init(mmci_init);
686	module_exit(mmci_exit);
687	module_param(fmax, uint, 0444);
688
689	MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
690	MODULE_LICENSE("GPL");