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

/*
 * drivers/mmc/host/omap_hsmmc.c
 *
 * Driver for OMAP2430/3430 MMC controller.
 *
 * Copyright (C) 2007 Texas Instruments.
 *
 * Authors:
 *	Syed Mohammed Khasim	<x0khasim@ti.com>
 *	Madhusudhan		<madhu.cr@ti.com>
 *	Mohit Jalori		<mjalori@ti.com>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/timer.h>
#include <linux/clk.h>
#include <linux/mmc/host.h>
#include <linux/io.h>
#include <linux/semaphore.h>
#include <mach/dma.h>
#include <mach/hardware.h>
#include <mach/board.h>
#include <mach/mmc.h>
#include <mach/cpu.h>

/* OMAP HSMMC Host Controller Registers */
#define OMAP_HSMMC_SYSCONFIG	0x0010
#define OMAP_HSMMC_CON		0x002C
#define OMAP_HSMMC_BLK		0x0104
#define OMAP_HSMMC_ARG		0x0108
#define OMAP_HSMMC_CMD		0x010C
#define OMAP_HSMMC_RSP10	0x0110
#define OMAP_HSMMC_RSP32	0x0114
#define OMAP_HSMMC_RSP54	0x0118
#define OMAP_HSMMC_RSP76	0x011C
#define OMAP_HSMMC_DATA		0x0120
#define OMAP_HSMMC_HCTL		0x0128
#define OMAP_HSMMC_SYSCTL	0x012C
#define OMAP_HSMMC_STAT		0x0130
#define OMAP_HSMMC_IE		0x0134
#define OMAP_HSMMC_ISE		0x0138
#define OMAP_HSMMC_CAPA		0x0140

#define VS18			(1 << 26)
#define VS30			(1 << 25)
#define SDVS18			(0x5 << 9)
#define SDVS30			(0x6 << 9)
#define SDVS33			(0x7 << 9)
#define SDVS_MASK		0x00000E00
#define SDVSCLR			0xFFFFF1FF
#define SDVSDET			0x00000400
#define AUTOIDLE		0x1
#define SDBP			(1 << 8)
#define DTO			0xe
#define ICE			0x1
#define ICS			0x2
#define CEN			(1 << 2)
#define CLKD_MASK		0x0000FFC0
#define CLKD_SHIFT		6
#define DTO_MASK		0x000F0000
#define DTO_SHIFT		16
#define INT_EN_MASK		0x307F0033
#define INIT_STREAM		(1 << 1)
#define DP_SELECT		(1 << 21)
#define DDIR			(1 << 4)
#define DMA_EN			0x1
#define MSBS			(1 << 5)
#define BCE			(1 << 1)
#define FOUR_BIT		(1 << 1)
#define CC			0x1
#define TC			0x02
#define OD			0x1
#define ERR			(1 << 15)
#define CMD_TIMEOUT		(1 << 16)
#define DATA_TIMEOUT		(1 << 20)
#define CMD_CRC			(1 << 17)
#define DATA_CRC		(1 << 21)
#define CARD_ERR		(1 << 28)
#define STAT_CLEAR		0xFFFFFFFF
#define INIT_STREAM_CMD		0x00000000
#define DUAL_VOLT_OCR_BIT	7
#define SRC			(1 << 25)
#define SRD			(1 << 26)

/*
 * FIXME: Most likely all the data using these _DEVID defines should come
 * from the platform_data, or implemented in controller and slot specific
 * functions.
 */
#define OMAP_MMC1_DEVID		0
#define OMAP_MMC2_DEVID		1

#define OMAP_MMC_DATADIR_NONE	0
#define OMAP_MMC_DATADIR_READ	1
#define OMAP_MMC_DATADIR_WRITE	2
#define MMC_TIMEOUT_MS		20
#define OMAP_MMC_MASTER_CLOCK	96000000
#define DRIVER_NAME		"mmci-omap-hs"

/*
 * One controller can have multiple slots, like on some omap boards using
 * omap.c controller driver. Luckily this is not currently done on any known
 * omap_hsmmc.c device.
 */
#define mmc_slot(host)		(host->pdata->slots[host->slot_id])

/*
 * MMC Host controller read/write API's
 */
#define OMAP_HSMMC_READ(base, reg)	\
	__raw_readl((base) + OMAP_HSMMC_##reg)

#define OMAP_HSMMC_WRITE(base, reg, val) \
	__raw_writel((val), (base) + OMAP_HSMMC_##reg)

struct mmc_omap_host {
	struct	device		*dev;
	struct	mmc_host	*mmc;
	struct	mmc_request	*mrq;
	struct	mmc_command	*cmd;
	struct	mmc_data	*data;
	struct	clk		*fclk;
	struct	clk		*iclk;
	struct	clk		*dbclk;
	struct	semaphore	sem;
	struct	work_struct	mmc_carddetect_work;
	void	__iomem		*base;
	resource_size_t		mapbase;
	unsigned int		id;
	unsigned int		dma_len;
	unsigned int		dma_dir;
	unsigned char		bus_mode;
	unsigned char		datadir;
	u32			*buffer;
	u32			bytesleft;
	int			suspended;
	int			irq;
	int			carddetect;
	int			use_dma, dma_ch;
	int			initstr;
	int			slot_id;
	int			dbclk_enabled;
	struct	omap_mmc_platform_data	*pdata;
};

/*
 * Stop clock to the card
 */
static void omap_mmc_stop_clock(struct mmc_omap_host *host)
{
	OMAP_HSMMC_WRITE(host->base,