/*
* linux/drivers/mmc/tmio_mmc.c
*
* Copyright (C) 2004 Ian Molton
* Copyright (C) 2007 Ian Molton
*
* 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.
*
* Driver for the MMC / SD / SDIO cell found in:
*
* TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
*
* This driver draws mainly on scattered spec sheets, Reverse engineering
* of the toshiba e800 SD driver and some parts of the 2.4 ASIC3 driver (4 bit
* support). (Further 4 bit support from a later datasheet).
*
* TODO:
* Investigate using a workqueue for PIO transfers
* Eliminate FIXMEs
* SDIO support
* Better Power management
* Handle MMC errors better
* double buffer support
*
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/highmem.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/scatterlist.h>
#define CTL_SD_CMD 0x00
#define CTL_ARG_REG 0x04
#define CTL_STOP_INTERNAL_ACTION 0x08
#define CTL_XFER_BLK_COUNT 0xa
#define CTL_RESPONSE 0x0c
#define CTL_STATUS 0x1c
#define CTL_IRQ_MASK 0x20
#define CTL_SD_CARD_CLK_CTL 0x24
#define CTL_SD_XFER_LEN 0x26
#define CTL_SD_MEM_CARD_OPT 0x28
#define CTL_SD_ERROR_DETAIL_STATUS 0x2c
#define CTL_SD_DATA_PORT 0x30
#define CTL_TRANSACTION_CTL 0x34
#define CTL_SDIO_STATUS 0x36
#define CTL_SDIO_IRQ_MASK 0x38
#define CTL_RESET_SD 0xe0
#define CTL_SDIO_REGS 0x100
#define CTL_CLK_AND_WAIT_CTL 0x138
#define CTL_RESET_SDIO 0x1e0
/* Definitions for values the CTRL_STATUS register can take. */
#define TMIO_STAT_CMDRESPEND 0x00000001
#define TMIO_STAT_DATAEND 0x00000004
#define TMIO_STAT_CARD_REMOVE 0x00000008
#define TMIO_STAT_CARD_INSERT 0x00000010
#define TMIO_STAT_SIGSTATE 0x00000020
#define TMIO_STAT_WRPROTECT 0x00000080
#define TMIO_STAT_CARD_REMOVE_A 0x00000100
#define TMIO_STAT_CARD_INSERT_A 0x00000200
#define TMIO_STAT_SIGSTATE_A 0x00000400
#define TMIO_STAT_CMD_IDX_ERR 0x00010000
#define TMIO_STAT_CRCFAIL 0x00020000
#define TMIO_STAT_STOPBIT_ERR 0x00040000
#define TMIO_STAT_DATATIMEOUT 0x00080000
#define TMIO_STAT_RXOVERFLOW 0x00100000
#define TMIO_STAT_TXUNDERRUN 0x00200000
#define TMIO_STAT_CMDTIMEOUT 0x00400000
#define TMIO_STAT_RXRDY 0x01000000
#define TMIO_STAT_TXRQ 0x02000000
#define TMIO_STAT_ILL_FUNC 0x20000000
#define TMIO_STAT_CMD_BUSY 0x40000000
#define TMIO_STAT_ILL_ACCESS 0x80000000
/* Definitions for values the CTRL_SDIO_STATUS register can take. */
#define TMIO_SDIO_STAT_IOIRQ 0x0001
#define TMIO_SDIO_STAT_EXPUB52 0x4000
#define TMIO_SDIO_STAT_EXWT 0x8000
#define TMIO_SDIO_MASK_ALL 0xc007
/* Define some IRQ masks */
/* This is the mask used at reset by the chip */
#define TMIO_MASK_ALL 0x837f031d
#define TMIO_MASK_READOP (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND)
#define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND)
#define TMIO_MASK_CMD (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
#define TMIO_MASK_IRQ (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)
#define enable_mmc_irqs(host, i) \
do { \
u32 mask;\
mask = sd_ctrl_read32((host), CTL_IRQ_MASK); \
mask &= ~((i) & TMIO_MASK_IRQ); \
sd_ctrl_write32((host), CTL_IRQ_MASK, mask); \
} while (0)
#define disable_mmc_irqs(host, i) \
do { \
u32 mask;\
mask = sd_ctrl_read32((host), CTL_IRQ_MASK); \
mask |= ((i) & TMIO_MASK_IRQ); \
sd_ctrl_write32((host), CTL_IRQ_MASK, mask); \
} while (0)
#define ack_mmc_irqs(host, i) \
do { \
sd_ctrl_write32((host), CTL_STATUS, ~(i)); \
} while (0)
/* This is arbitrary, just noone needed any higher alignment yet */
#define MAX_ALIGN 4
struct tmio_mmc_host {
void __iomem *ctl;
unsigned long bus_shift;
struct mmc_command *cmd;
struct mmc_request *mrq;
struct mmc_data *data;
struct mmc_host *mmc;
int irq;
unsigned int sdio_irq_enabled;
/* Callbacks for clock / power control */
void (*set_pwr)(struct platform_device *host, int state);
void (*set_clk_div)(struct platform_device *host, int state);
/* pio related stuff */
struct scatterlist *sg_ptr;
struct scatterlist *sg_orig;