/*
 * (C) Copyright 2010 Juergen Beisert, Pengutronix
 *
 * This code is partially based on u-boot code:
 *
 * Copyright 2008, Freescale Semiconductor, Inc
 * Andy Fleming
 *
 * Based (loosely) on the Linux code
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#ifndef _MCI_H_
#define _MCI_H_

#include <linux/list.h>

/* Firmware revisions for SD cards */
#define SD_VERSION_SD		0x20000
#define SD_VERSION_2		(SD_VERSION_SD | 0x20)
#define SD_VERSION_1_0		(SD_VERSION_SD | 0x10)
#define SD_VERSION_1_10		(SD_VERSION_SD | 0x1a)

/* Firmware revisions for MMC cards */
#define MMC_VERSION_MMC		0x10000
#define MMC_VERSION_UNKNOWN	(MMC_VERSION_MMC)
#define MMC_VERSION_1_2		(MMC_VERSION_MMC | 0x12)
#define MMC_VERSION_1_4		(MMC_VERSION_MMC | 0x14)
#define MMC_VERSION_2_2		(MMC_VERSION_MMC | 0x22)
#define MMC_VERSION_3		(MMC_VERSION_MMC | 0x30)
#define MMC_VERSION_4		(MMC_VERSION_MMC | 0x40)

#define MMC_MODE_HS		0x001
#define MMC_MODE_HS_52MHz	0x010
#define MMC_MODE_4BIT		0x100
#define MMC_MODE_8BIT		0x200

#define SD_DATA_4BIT		0x00040000

#define IS_SD(x) (x->version & SD_VERSION_SD)

#define MMC_DATA_READ		1
#define MMC_DATA_WRITE		2

/* command list */
#define MMC_CMD_GO_IDLE_STATE		0
#define MMC_CMD_SEND_OP_COND		1
#define MMC_CMD_ALL_SEND_CID		2
#define MMC_CMD_SET_RELATIVE_ADDR	3
#define MMC_CMD_SET_DSR			4
#define MMC_CMD_SWITCH			6
#define MMC_CMD_SELECT_CARD		7
#define MMC_CMD_SEND_EXT_CSD		8
#define MMC_CMD_SEND_CSD		9
#define MMC_CMD_SEND_CID		10
#define MMC_CMD_STOP_TRANSMISSION	12
#define MMC_CMD_SEND_STATUS		13
#define MMC_CMD_SET_BLOCKLEN		16
#define MMC_CMD_READ_SINGLE_BLOCK	17
#define MMC_CMD_READ_MULTIPLE_BLOCK	18
#define MMC_CMD_WRITE_SINGLE_BLOCK	24
#define MMC_CMD_WRITE_MULTIPLE_BLOCK	25
#define MMC_CMD_APP_CMD			55

#define SD_CMD_SEND_RELATIVE_ADDR	3
#define SD_CMD_SWITCH_FUNC		6
#define SD_CMD_SEND_IF_COND		8

#define SD_CMD_APP_SET_BUS_WIDTH	6
#define SD_CMD_APP_SEND_OP_COND		41
#define SD_CMD_APP_SEND_SCR		51

/* SCR definitions in different words */
#define SD_HIGHSPEED_BUSY	0x00020000
#define SD_HIGHSPEED_SUPPORTED	0x00020000

#define MMC_HS_TIMING		0x00000100
#define MMC_HS_52MHZ		0x2

#define OCR_BUSY		0x80000000
/** card's response in its OCR if it is a high capacity card */
#define OCR_HCS			0x40000000

#define MMC_VDD_165_195		0x00000080	/* VDD voltage 1.65 - 1.95 */
#define MMC_VDD_20_21		0x00000100	/* VDD voltage 2.0 ~ 2.1 */
#define MMC_VDD_21_22		0x00000200	/* VDD voltage 2.1 ~ 2.2 */
#define MMC_VDD_22_23		0x00000400	/* VDD voltage 2.2 ~ 2.3 */
#define MMC_VDD_23_24		0x00000800	/* VDD voltage 2.3 ~ 2.4 */
#define MMC_VDD_24_25		0x00001000	/* VDD voltage 2.4 ~ 2.5 */
#define MMC_VDD_25_26		0x00002000	/* VDD voltage 2.5 ~ 2.6 */
#define MMC_VDD_26_27		0x00004000	/* VDD voltage 2.6 ~ 2.7 */
#define MMC_VDD_27_28		0x00008000	/* VDD voltage 2.7 ~ 2.8 */
#define MMC_VDD_28_29		0x00010000	/* VDD voltage 2.8 ~ 2.9 */
#define MMC_VDD_29_30		0x00020000	/* VDD voltage 2.9 ~ 3.0 */
#define MMC_VDD_30_31		0x00040000	/* VDD voltage 3.0 ~ 3.1 */
#define MMC_VDD_31_32		0x00080000	/* VDD voltage 3.1 ~ 3.2 */
#define MMC_VDD_32_33		0x00100000	/* VDD voltage 3.2 ~ 3.3 */
#define MMC_VDD_33_34		0x00200000	/* VDD voltage 3.3 ~ 3.4 */
#define MMC_VDD_34_35		0x00400000	/* VDD voltage 3.4 ~ 3.5 */
#define MMC_VDD_35_36		0x00800000	/* VDD voltage 3.5 ~ 3.6 */

#define MMC_SWITCH_MODE_CMD_SET		0x00 /** Change the command set */
 /** Set bits in EXT_CSD byte addressed by index which are 1 in value field */
#define MMC_SWITCH_MODE_SET_BITS	0x01
 /** Clear bits in EXT_CSD byte addressed by index, which are 1 in value field */
#define MMC_SWITCH_MODE_CLEAR_BITS	0x02
 /** Set target byte to value */
#define MMC_SWITCH_MODE_WRITE_BYTE	0x03

#define SD_SWITCH_CHECK		0
#define SD_SWITCH_SWITCH	1

/*
 * EXT_CSD fields
 */

#define EXT_CSD_BUS_WIDTH	183	/* R/W */
#define EXT_CSD_HS_TIMING	185	/* R/W */
#define EXT_CSD_CARD_TYPE	196	/* RO */
#define EXT_CSD_REV		192	/* RO */
#define EXT_CSD_SEC_CNT		212	/* RO, 4 bytes */

/*
 * EXT_CSD field definitions
 */

#define EXT_CSD_CMD_SET_NORMAL		(1<<0)
#define EXT_CSD_CMD_SET_SECURE		(1<<1)
#define EXT_CSD_CMD_SET_CPSECURE	(1<<2)

#define EXT_CSD_CARD_TYPE_26	(1<<0)	/* Card can run at 26MHz */
#define EXT_CSD_CARD_TYPE_52	(1<<1)	/* Card can run at 52MHz */

#define EXT_CSD_BUS_WIDTH_1	0	/* Card is in 1 bit mode */
#define EXT_CSD_BUS_WIDTH_4	1	/* Card is in 4 bit mode */
#define EXT_CSD_BUS_WIDTH_8	2	/* Card is in 8 bit mode */

#define R1_ILLEGAL_COMMAND		(1 << 22)
#define R1_APP_CMD			(1 << 5)

/* response types */
#define MMC_RSP_PRESENT (1 << 0)
#define MMC_RSP_136     (1 << 1)                /* 136 bit response */
#define MMC_RSP_CRC     (1 << 2)                /* expect valid crc */
#define MMC_RSP_BUSY    (1 << 3)                /* card may send busy */
#define MMC_RSP_OPCODE  (1 << 4)                /* response contains opcode */

#define MMC_RSP_NONE    (0)
#define MMC_RSP_R1      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
#define MMC_RSP_R1b	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY)
#define MMC_RSP_R2      (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
#define MMC_RSP_R3      (MMC_RSP_PRESENT)
#define MMC_RSP_R4      (MMC_RSP_PRESENT)
#define MMC_RSP_R5      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
#define MMC_RSP_R6      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
#define MMC_RSP_R7      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)

/** command information to be sent to the SD/MMC card */
struct mci_cmd {
	unsigned cmdidx;	/**< Command to be sent to the SD/MMC card */
	unsigned resp_type;	/**< Type of expected response, refer MMC_RSP_* macros */
	unsigned cmdarg;	/**< Command's arguments */
	unsigned response[4];	/**< card's response */
};

/** data information to be used with some SD/MMC commands */
struct mci_data {
	union {
		uint8_t *dest;
		const uint8_t *src; /**< src buffers don't get written to */
	};
	unsigned flags;		/**< refer MMC_DATA_* to define direction */
	unsigned blocks;	/**< block count to handle in this command */
	unsigned blocksize;	/**< block size in bytes (mostly 512) */
};

/** host information */
struct mci_host {
	struct device_d *hw_dev;	/**< the host MCI hardware device */
	unsigned voltages;
	unsigned host_caps;	/**< Host's interface capabilities, refer MMC_VDD_* */
	unsigned f_min;		/**< host interface lower limit */
	unsigned f_max;		/**< host interface upper limit */
	unsigned clock;		/**< Current clock used to talk to the card */
	unsigned bus_width;	/**< used data bus width to the card */

	/** init the host interface */
	int (*init)(struct mci_host*, struct device_d*);
	/** change host interface settings */
	void (*set_ios)(struct mci_host*, struct device_d*, unsigned, unsigned);
	/** handle a command */
	int (*send_cmd)(struct mci_host*, struct mci_cmd*, struct mci_data*);
};

/** MMC/SD and interface instance information */
struct mci {
	unsigned version;
	/** != 0 when a high capacity card is connected (OCR -> OCR_HCS) */
	int high_capacity;
	unsigned card_caps;	/**< Card's capabilities */
	unsigned ocr;		/**< card's "operation condition register" */
	unsigned scr[2];
	unsigned csd[4];	/**< card's "card specific data register" */
	unsigned cid[4];	/**< card's "card identification register" */
	unsigned short rca;	/* FIXME */
	unsigned tran_speed;	/**< not yet used */
	/** currently used data block length for read accesses */
	unsigned read_bl_len;
	/** currently used data block length for write accesses */
	unsigned write_bl_len;
	uint64_t capacity;	/**< Card's data capacity in bytes */
	int ready_for_use;	/** true if already probed */
};

int mci_register(struct mci_host*);

#define GET_HOST_DATA(x) (x->priv)
#define GET_HOST_PDATA(x) (x->platform_data)
#define GET_MCI_DATA(x) (x->priv)
#define GET_MCI_PDATA(x) (x->platform_data)

#endif /* _MCI_H_ */