path: root/drivers/mmc/host/pxamci.c

/*
 *  linux/drivers/mmc/host/pxa.c - PXA MMCI driver
 *
 *  Copyright (C) 2003 Russell King, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  This hardware is really sick:
 *   - No way to clear interrupts.
 *   - Have to turn off the clock whenever we touch the device.
 *   - Doesn't tell you how many data blocks were transferred.
 *  Yuck!
 *
 *	1 and 3 byte data transfers not supported
 *	max block length up to 1023
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/mmc/host.h>
#include <linux/io.h>
#include <linux/regulator/consumer.h>
#include <linux/gpio.h>
#include <linux/gfp.h>

#include <asm/sizes.h>

#include <mach/hardware.h>
#include <mach/dma.h>
#include <mach/mmc.h>

#include "pxamci.h"

#define DRIVER_NAME	"pxa2xx-mci"

#define NR_SG	1
#define CLKRT_OFF	(~0)

#define mmc_has_26MHz()		(cpu_is_pxa300() || cpu_is_pxa310() \
				|| cpu_is_pxa935())

struct pxamci_host {
	struct mmc_host		*mmc;
	spinlock_t		lock;
	struct resource		*res;
	void __iomem		*base;
	struct clk		*clk;
	unsigned long		clkrate;
	int			irq;
	int			dma;
	unsigned int		clkrt;
	unsigned int		cmdat;
	unsigned int		imask;
	unsigned int		power_mode;
	struct pxamci_platform_data *pdata;

	struct mmc_request	*mrq;
	struct mmc_command	*cmd;
	struct mmc_data		*data;

	dma_addr_t		sg_dma;
	struct pxa_dma_desc	*sg_cpu;
	unsigned int		dma_len;

	unsigned int		dma_dir;
	unsigned int		dma_drcmrrx;
	unsigned int		dma_drcmrtx;

	struct regulator	*vcc;
};

static inline void pxamci_init_ocr(struct pxamci_host *host)
{
#ifdef CONFIG_REGULATOR
	host->vcc = regulator_get(mmc_dev(host->mmc), "vmmc");

	if (IS_ERR(host->vcc))
		host->vcc = NULL;
	else {
		host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc);
		if (host->pdata && host->pdata->ocr_mask)
			dev_warn(mmc_dev(host->mmc),
				"ocr_mask/setpower will not be used\n");
	}
#endif
	if (host->vcc == NULL) {
		/* fall-back to platform data */
		host->mmc->ocr_avail = host->pdata ?
			host->pdata->ocr_mask :
			MMC_VDD_32_33 | MMC_VDD_33_34;
	}
}

static inline void pxamci_set_power(struct pxamci_host *host, unsigned int vdd)
{
	int on;

#ifdef CONFIG_REGULATOR
	if (host->vcc)
		mmc_regulator_set_ocr(host->vcc, vdd);
#endif
	if (!host->vcc && host->pdata &&
	    gpio_is_valid(host->pdata->gpio_power)) {
		on = ((1 << vdd) & host->pdata->ocr_mask);
		gpio_set_value(host->pdata->gpio_power,
			       !!on ^ host->pdata->gpio_power_invert);
	}
	if (!host->vcc && host->pdata && host->pdata->setpower)
		host->pdata->setpower(mmc_dev(host->mmc), vdd);
}

static void pxamci_stop_clock(struct pxamci_host *host)
{
	if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
		unsigned long timeout = 10000;
		unsigned int v;

		writel(STOP_CLOCK, host->base + MMC_STRPCL);

		do {
			v = readl(host->base + MMC_STAT);
			if (!(v & STAT_CLK_EN))
				break;
			udelay(1);
		} while (timeout--);

		if (v & STAT_CLK_EN)
			dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
	}
}

static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
{
	unsigned long flags;

	spin_lock_irqsave(&host->lock, flags);
	host->imask &= ~mask;
	writel(host->imask, host->base + MMC_I_MASK);
	spin_unlock_irqrestore(&host->lock, flags);
}

static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
{
	unsigned long flags;

	spin_lock_irqsave(&host->lock, flags);
	host->imask |= mask;
	writel(host->imask, host->base + MMC_I_MASK);
	spin_unlock_irqrestore(&host->lock, flags);
}

static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
{
	unsigned int nob = data->blocks;
	unsigned long long clks;
	unsigned int timeout;
	bool dalgn = 0;
	u32 dcmd;
	int i;

	host->data = data;

	if (data->flags & MMC_DATA_STREAM)
		nob = 0xffff;

	writel(nob, host->base + MMC_NOB);
	writel(data->blksz, host->base + MMC_BLKLEN);

	clks = (unsigned long long