path: root/drivers/mmc/omap.c

/*
 *  linux/drivers/media/mmc/omap.c
 *
 *  Copyright (C) 2004 Nokia Corporation
 *  Written by Tuukka Tikkanen and Juha Yrjölä<juha.yrjola@nokia.com>
 *  Misc hacks here and there by Tony Lindgren <tony@atomide.com>
 *  Other hacks (DMA, SD, etc) by David Brownell
 *
 * 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/config.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/mmc/host.h>
#include <linux/mmc/protocol.h>
#include <linux/mmc/card.h>
#include <linux/clk.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/scatterlist.h>
#include <asm/mach-types.h>

#include <asm/arch/board.h>
#include <asm/arch/gpio.h>
#include <asm/arch/dma.h>
#include <asm/arch/mux.h>
#include <asm/arch/fpga.h>
#include <asm/arch/tps65010.h>

#include "omap.h"

#define DRIVER_NAME "mmci-omap"
#define RSP_TYPE(x)	((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))

/* Specifies how often in millisecs to poll for card status changes
 * when the cover switch is open */
#define OMAP_MMC_SWITCH_POLL_DELAY	500

static int mmc_omap_enable_poll = 1;

struct mmc_omap_host {
	int			initialized;
	int			suspended;
	struct mmc_request *	mrq;
	struct mmc_command *	cmd;
	struct mmc_data *	data;
	struct mmc_host *	mmc;
	struct device *		dev;
	unsigned char		id; /* 16xx chips have 2 MMC blocks */
	struct clk *		iclk;
	struct clk *		fclk;
	void __iomem		*base;
	int			irq;
	unsigned char		bus_mode;
	unsigned char		hw_bus_mode;

	unsigned int		sg_len;
	int			sg_idx;
	u16 *			buffer;
	u32			buffer_bytes_left;
	u32			total_bytes_left;

	unsigned		use_dma:1;
	unsigned		brs_received:1, dma_done:1;
	unsigned		dma_is_read:1;
	unsigned		dma_in_use:1;
	int			dma_ch;
	spinlock_t		dma_lock;
	struct timer_list	dma_timer;
	unsigned		dma_len;

	short			power_pin;
	short			wp_pin;

	int			switch_pin;
	struct work_struct	switch_work;
	struct timer_list	switch_timer;
	int			switch_last_state;
};

static inline int
mmc_omap_cover_is_open(struct mmc_omap_host *host)
{
	if (host->switch_pin < 0)
		return 0;
	return omap_get_gpio_datain(host->switch_pin);
}

static ssize_t
mmc_omap_show_cover_switch(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct mmc_omap_host *host = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", mmc_omap_cover_is_open(host) ? "open" :
			"closed");
}

static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);

static ssize_t
mmc_omap_show_enable_poll(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", mmc_omap_enable_poll);
}

static ssize_t
mmc_omap_store_enable_poll(struct device *dev,
	struct device_attribute *attr, const char *buf,
	size_t size)
{
	int enable_poll;

	if (sscanf(buf, "%10d", &enable_poll) != 1)
		return -EINVAL;

	if (enable_poll != mmc_omap_enable_poll) {
		struct mmc_omap_host *host = dev_get_drvdata(dev);

		mmc_omap_enable_poll = enable_poll;
		if (enable_poll && host->switch_pin >= 0)
			schedule_work(&host->switch_work);
	}
	return size;
}

static DEVICE_ATTR(enable_poll, 0664,
		   mmc_omap_show_enable_poll, mmc_omap_store_enable_poll);

static void
mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
{
	u32 cmdreg;
	u32 resptype;
	u32 cmdtype;

	host->cmd = cmd;

	resptype = 0;
	cmdtype = 0;

	/* Our hardware needs to know exact type */
	switch (RSP_TYPE(mmc_resp_type(cmd))) {
	case RSP_TYPE(MMC_RSP_R1):
		/* resp 1, resp 1b */
		resptype = 1;
		break;
	case RSP_TYPE(MMC_RSP_R2):
		resptype = 2;
		break;
	case RSP_TYPE(MMC_RSP_R3):
		resptype = 3;
		break;
	default:
		break;
	}

	if (mmc_cmd_type(cmd) == MMC_CMD_ADTC) {
		cmdtype = OMAP_MMC_CMDTYPE_ADTC;
	} else if (mmc_cmd_type(cmd) == MMC_CMD_BC) {
		cmdtype = OMAP_MMC_CMDTYPE_BC;
	} else if (mmc_cmd_type(cmd) == MMC_CMD_BCR) {
		cmdtype = OMAP_MMC_CMDTYPE_BCR;
	} else {
		cmdtype = OMAP_MMC_CMDTYPE_AC;
	}

	cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);

	if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
		cmdreg |= 1 << 6;

	if (cmd->flags & MMC_RSP_BUSY)
		cmdreg |= 1 << 11;

	if (host->data && !(host->data->flags & MMC_DATA_WRITE))
		cmdreg |= 1 << 15;

	clk_enable(host->fclk);

	OMAP_MMC_WRITE(host->base, CTO, 200);
	OMAP_MMC_WRITE(host->base, ARGL, cmd->arg & 0xffff);
	OMAP_MMC_WRITE(host->base, ARGH, cmd->arg >> 16);
	OMAP_MMC_WRITE(host->base, IE,
		       OMAP_MMC_STAT_A_EMPTY    | OMAP_MMC_STAT_A_FULL    |
		       OMAP_MMC_STAT_CMD_CRC    | OMAP_MMC_STAT_CMD_TOUT  |
		       OMAP_MMC_STAT_DATA_CRC   | OMAP_MMC_STAT_DATA_TOUT |
		       OMAP_MMC_STAT_END_OF_CMD | OMAP_MMC_STAT_CARD_ERR  |
		       OMAP_MMC_STAT_END_OF_DATA);
	OMAP_MMC_WRITE(host->base, CMD, cmdreg);
}

static void
mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
{
	if (host->dma_in_use) {