/*
 * Synopsys DesignWare Multimedia Card Interface driver
 *  (Based on NXP driver for lpc 31xx)
 *
 * Copyright (C) 2009 NXP Semiconductors
 * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
 *
 * 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.
 */

#ifndef _DW_MMC_H_
#define _DW_MMC_H_

#include <linux/scatterlist.h>
#include <linux/mmc/core.h>
#include <linux/dmaengine.h>
#include <linux/reset.h>
#include <linux/interrupt.h>

enum dw_mci_state {
        STATE_IDLE = 0,
        STATE_SENDING_CMD,
        STATE_SENDING_DATA,
        STATE_DATA_BUSY,
        STATE_SENDING_STOP,
        STATE_DATA_ERROR,
        STATE_SENDING_CMD11,
        STATE_WAITING_CMD11_DONE,
};

enum {
        EVENT_CMD_COMPLETE = 0,
        EVENT_XFER_COMPLETE,
        EVENT_DATA_COMPLETE,
        EVENT_DATA_ERROR,
};

enum dw_mci_cookie {
        COOKIE_UNMAPPED,
        COOKIE_PRE_MAPPED,      /* mapped by pre_req() of dwmmc */
        COOKIE_MAPPED,          /* mapped by prepare_data() of dwmmc */
};

struct mmc_data;

enum {
        TRANS_MODE_PIO = 0,
        TRANS_MODE_IDMAC,
        TRANS_MODE_EDMAC
};

struct dw_mci_dma_slave {
        struct dma_chan *ch;
        enum dma_transfer_direction direction;
};

/**
 * struct dw_mci - MMC controller state shared between all slots
 * @lock: Spinlock protecting the queue and associated data.
 * @irq_lock: Spinlock protecting the INTMASK setting.
 * @regs: Pointer to MMIO registers.
 * @fifo_reg: Pointer to MMIO registers for data FIFO
 * @sg: Scatterlist entry currently being processed by PIO code, if any.
 * @sg_miter: PIO mapping scatterlist iterator.
 * @mrq: The request currently being processed on @slot,
 *      or NULL if the controller is idle.
 * @cmd: The command currently being sent to the card, or NULL.
 * @data: The data currently being transferred, or NULL if no data
 *      transfer is in progress.
 * @stop_abort: The command currently prepared for stoping transfer.
 * @prev_blksz: The former transfer blksz record.
 * @timing: Record of current ios timing.
 * @use_dma: Which DMA channel is in use for the current transfer, zero
 *      denotes PIO mode.
 * @using_dma: Whether DMA is in use for the current transfer.
 * @dma_64bit_address: Whether DMA supports 64-bit address mode or not.
 * @sg_dma: Bus address of DMA buffer.
 * @sg_cpu: Virtual address of DMA buffer.
 * @dma_ops: Pointer to platform-specific DMA callbacks.
 * @cmd_status: Snapshot of SR taken upon completion of the current
 * @ring_size: Buffer size for idma descriptors.
 *      command. Only valid when EVENT_CMD_COMPLETE is pending.
 * @dms: structure of slave-dma private data.
 * @phy_regs: physical address of controller's register map
 * @data_status: Snapshot of SR taken upon completion of the current
 *      data transfer. Only valid when EVENT_DATA_COMPLETE or
 *      EVENT_DATA_ERROR is pending.
 * @stop_cmdr: Value to be loaded into CMDR when the stop command is
 *      to be sent.
 * @dir_status: Direction of current transfer.
 * @tasklet: Tasklet running the request state machine.
 * @pending_events: Bitmask of events flagged by the interrupt handler
 *      to be processed by the tasklet.
 * @completed_events: Bitmask of events which the state machine has
 *      processed.
 * @state: Tasklet state.
 * @queue: List of slots waiting for access to the controller.
 * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
 *      rate and timeout calculations.
 * @current_speed: Configured rate of the controller.
 * @fifoth_val: The value of FIFOTH register.
 * @verid: Denote Version ID.
 * @dev: Device associated with the MMC controller.
 * @pdata: Platform data associated with the MMC controller.
 * @drv_data: Driver specific data for identified variant of the controller
 * @priv: Implementation defined private data.
 * @biu_clk: Pointer to bus interface unit clock instance.
 * @ciu_clk: Pointer to card interface unit clock instance.
 * @slot: Slots sharing this MMC controller.
 * @fifo_depth: depth of FIFO.
 * @data_addr_override: override fifo reg offset with this value.
 * @wm_aligned: force fifo watermark equal with data length in PIO mode.
 *      Set as true if alignment is needed.
 * @data_shift: log2 of FIFO item size.
 * @part_buf_start: Start index in part_buf.
 * @part_buf_count: Bytes of partial data in part_buf.
 * @part_buf: Simple buffer for partial fifo reads/writes.
 * @push_data: Pointer to FIFO push function.
 * @pull_data: Pointer to FIFO pull function.
 * @vqmmc_enabled: Status of vqmmc, should be true or false.
 * @irq_flags: The flags to be passed to request_irq.
 * @irq: The irq value to be passed to request_irq.
 * @sdio_id0: Number of slot0 in the SDIO interrupt registers.
 * @cmd11_timer: Timer for SD3.0 voltage switch over scheme.
 * @cto_timer: Timer for broken command transfer over scheme.
 * @dto_timer: Timer for broken data transfer over scheme.
 *
 * Locking
 * =======
 *
 * @lock is a softirq-safe spinlock protecting @queue as well as
 * @slot, @mrq and @state. These must always be updated
 * at the same time while holding @lock.
 * The @mrq field of struct dw_mci_slot is also protected by @lock,
 * and must always be written at the same time as the slot is added to
 * @queue.
 *
 * @irq_lock is an irq-safe spinlock protecting the INTMASK register
 * to allow the interrupt handler to modify it directly.  Held for only long
 * enough to read-modify-write INTMASK and no other locks are grabbed when
 * holding this one.
 *
 * @pending_events and @completed_events are accessed using atomic bit
 * operations, so they don't need any locking.
 *
 * None of the fields touched by the interrupt handler need any
 * locking. However, ordering is important: Before EVENT_DATA_ERROR or
 * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
 * interrupts must be disabled and @data_status updated with a
 * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
 * CMDRDY interrupt must be disabled and @cmd_status updated with a
 * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
 * bytes_xfered field of @data must be written. This is ensured by
 * using barriers.
 */
struct dw_mci {
        spinlock_t              lock;
        spinlock_t              irq_lock;
        void __iomem            *regs;
        void __iomem            *fifo_reg;
        u32                     data_addr_override;
        bool                    wm_aligned;

        struct scatterlist      *sg;
        struct sg_mapping_iter  sg_miter;

        struct mmc_request      *mrq;
        struct mmc_command      *cmd;
        struct mmc_data         *data;
        struct mmc_command      stop_abort;
        unsigned int            prev_blksz;
        unsigned char           timing;

        /* DMA interface members*/
        int                     use_dma;
        int                     using_dma;
        int                     dma_64bit_address;

        dma_addr_t              sg_dma;
        void                    *sg_cpu;
        const struct dw_mci_dma_ops     *dma_ops;
        /* For idmac */
        unsigned int            ring_size;

        /* For edmac */
        struct dw_mci_dma_slave *dms;
        /* Registers's physical base address */
        resource_size_t         phy_regs;

        u32                     cmd_status;
        u32                     data_status;
        u32                     stop_cmdr;
        u32                     dir_status;
        struct tasklet_struct   tasklet;
        unsigned long           pending_events;
        unsigned long           completed_events;
        enum dw_mci_state       state;
        struct list_head        queue;

        u32                     bus_hz;
        u32                     current_speed;
        u32                     fifoth_val;
        u16                     verid;
        struct device           *dev;
        struct dw_mci_board     *pdata;
        const struct dw_mci_drv_data    *drv_data;
        void                    *priv;
        struct clk              *biu_clk;
        struct clk              *ciu_clk;
        struct dw_mci_slot      *slot;

        /* FIFO push and pull */
        int                     fifo_depth;
        int                     data_shift;
        u8                      part_buf_start;
        u8                      part_buf_count;
        union {
                u16             part_buf16;
                u32             part_buf32;
                u64             part_buf;
        };
        void (*push_data)(struct dw_mci *host, void *buf, int cnt);
        void (*pull_data)(struct dw_mci *host, void *buf, int cnt);

        bool                    vqmmc_enabled;
        unsigned long           irq_flags; /* IRQ flags */
        int                     irq;

        int                     sdio_id0;

        struct timer_list       cmd11_timer;
        struct timer_list       cto_timer;
        struct timer_list       dto_timer;
};

/* DMA ops for Internal/External DMAC interface */
struct dw_mci_dma_ops {
        /* DMA Ops */
        int (*init)(struct dw_mci *host);
        int (*start)(struct dw_mci *host, unsigned int sg_len);
        void (*complete)(void *host);
        void (*stop)(struct dw_mci *host);
        void (*cleanup)(struct dw_mci *host);
        void (*exit)(struct dw_mci *host);
};

struct dma_pdata;

/* Board platform data */
struct dw_mci_board {
        unsigned int bus_hz; /* Clock speed at the cclk_in pad */

        u32 caps;       /* Capabilities */
        u32 caps2;      /* More capabilities */
        u32 pm_caps;    /* PM capabilities */
        /*
         * Override fifo depth. If 0, autodetect it from the FIFOTH register,
         * but note that this may not be reliable after a bootloader has used
         * it.
         */
        unsigned int fifo_depth;

        /* delay in mS before detecting cards after interrupt */
        u32 detect_delay_ms;

        struct reset_control *rstc;
        struct dw_mci_dma_ops *dma_ops;
        struct dma_pdata *data;
};

#define DW_MMC_240A             0x240a
#define DW_MMC_280A             0x280a

#define SDMMC_CTRL              0x000
#define SDMMC_PWREN             0x004
#define SDMMC_CLKDIV            0x008
#define SDMMC_CLKSRC            0x00c
#define SDMMC_CLKENA            0x010
#define SDMMC_TMOUT             0x014
#define SDMMC_CTYPE             0x018
#define SDMMC_BLKSIZ            0x01c
#define SDMMC_BYTCNT            0x020
#define SDMMC_INTMASK           0x024
#define SDMMC_CMDARG            0x028
#define SDMMC_CMD               0x02c
#define SDMMC_RESP0             0x030
#define SDMMC_RESP1             0x034
#define SDMMC_RESP2             0x038
#define SDMMC_RESP3             0x03c
#define SDMMC_MINTSTS           0x040
#define SDMMC_RINTSTS           0x044
#define SDMMC_STATUS            0x048
#define SDMMC_FIFOTH            0x04c
#define SDMMC_CDETECT           0x050
#define SDMMC_WRTPRT            0x054
#define SDMMC_GPIO              0x058
#define SDMMC_TCBCNT            0x05c
#define SDMMC_TBBCNT            0x060
#define SDMMC_DEBNCE            0x064
#define SDMMC_USRID             0x068
#define SDMMC_VERID             0x06c
#define SDMMC_HCON              0x070
#define SDMMC_UHS_REG           0x074
#define SDMMC_RST_N             0x078
#define SDMMC_BMOD              0x080
#define SDMMC_PLDMND            0x084
#define SDMMC_DBADDR            0x088
#define SDMMC_IDSTS             0x08c
#define SDMMC_IDINTEN           0x090
#define SDMMC_DSCADDR           0x094
#define SDMMC_BUFADDR           0x098
#define SDMMC_CDTHRCTL          0x100
#define SDMMC_UHS_REG_EXT       0x108
#define SDMMC_DDR_REG           0x10c
#define SDMMC_ENABLE_SHIFT      0x110
#define SDMMC_DATA(x)           (x)
/*
 * Registers to support idmac 64-bit address mode
 */
#define SDMMC_DBADDRL           0x088
#define SDMMC_DBADDRU           0x08c
#define SDMMC_IDSTS64           0x090
#define SDMMC_IDINTEN64         0x094
#define SDMMC_DSCADDRL          0x098
#define SDMMC_DSCADDRU          0x09c
#define SDMMC_BUFADDRL          0x0A0
#define SDMMC_BUFADDRU          0x0A4

/*
 * Data offset is difference according to Version
 * Lower than 2.40a : data register offest is 0x100
 */
#define DATA_OFFSET             0x100
#define DATA_240A_OFFSET        0x200

/* shift bit field */
#define _SBF(f, v)              ((v) << (f))

/* Control register defines */
#define SDMMC_CTRL_USE_IDMAC            BIT(25)
#define SDMMC_CTRL_CEATA_INT_EN         BIT(11)
#define SDMMC_CTRL_SEND_AS_CCSD         BIT(10)
#define SDMMC_CTRL_SEND_CCSD            BIT(9)
#define SDMMC_CTRL_ABRT_READ_DATA       BIT(8)
#define SDMMC_CTRL_SEND_IRQ_RESP        BIT(7)
#define SDMMC_CTRL_READ_WAIT            BIT(6)
#define SDMMC_CTRL_DMA_ENABLE           BIT(5)
#define SDMMC_CTRL_INT_ENABLE           BIT(4)
#define SDMMC_CTRL_DMA_RESET            BIT(2)
#define SDMMC_CTRL_FIFO_RESET           BIT(1)
#define SDMMC_CTRL_RESET                BIT(0)
/* Clock Enable register defines */
#define SDMMC_CLKEN_LOW_PWR             BIT(16)
#define SDMMC_CLKEN_ENABLE              BIT(0)
/* time-out register defines */
#define SDMMC_TMOUT_DATA(n)             _SBF(8, (n))
#define SDMMC_TMOUT_DATA_MSK            0xFFFFFF00
#define SDMMC_TMOUT_RESP(n)             ((n) & 0xFF)
#define SDMMC_TMOUT_RESP_MSK            0xFF
/* card-type register defines */
#define SDMMC_CTYPE_8BIT                BIT(16)
#define SDMMC_CTYPE_4BIT                BIT(0)
#define SDMMC_CTYPE_1BIT                0
/* Interrupt status & mask register defines */
#define SDMMC_INT_SDIO(n)               BIT(16 + (n))
#define SDMMC_INT_EBE                   BIT(15)
#define SDMMC_INT_ACD                   BIT(14)
#define SDMMC_INT_SBE                   BIT(13)
#define SDMMC_INT_HLE                   BIT(12)
#define SDMMC_INT_FRUN                  BIT(11)
#define SDMMC_INT_HTO                   BIT(10)
#define SDMMC_INT_VOLT_SWITCH           BIT(10) /* overloads bit 10! */
#define SDMMC_INT_DRTO                  BIT(9)
#define SDMMC_INT_RTO                   BIT(8)
#define SDMMC_INT_DCRC                  BIT(7)
#define SDMMC_INT_RCRC                  BIT(6)
#define SDMMC_INT_RXDR                  BIT(5)
#define SDMMC_INT_TXDR                  BIT(4)
#define SDMMC_INT_DATA_OVER             BIT(3)
#define SDMMC_INT_CMD_DONE              BIT(2)
#define SDMMC_INT_RESP_ERR              BIT(1)
#define SDMMC_INT_CD                    BIT(0)
#define SDMMC_INT_ERROR                 0xbfc2
/* Command register defines */
#define SDMMC_CMD_START                 BIT(31)
#define SDMMC_CMD_USE_HOLD_REG  BIT(29)
#define SDMMC_CMD_VOLT_SWITCH           BIT(28)
#define SDMMC_CMD_CCS_EXP               BIT(23)
#define SDMMC_CMD_CEATA_RD              BIT(22)
#define SDMMC_CMD_UPD_CLK               BIT(21)
#define SDMMC_CMD_INIT                  BIT(15)
#define SDMMC_CMD_STOP                  BIT(14)
#define SDMMC_CMD_PRV_DAT_WAIT          BIT(13)
#define SDMMC_CMD_SEND_STOP             BIT(12)
#define SDMMC_CMD_STRM_MODE             BIT(11)
#define SDMMC_CMD_DAT_WR                BIT(10)
#define SDMMC_CMD_DAT_EXP               BIT(9)
#define SDMMC_CMD_RESP_CRC              BIT(8)
#define SDMMC_CMD_RESP_LONG             BIT(7)
#define SDMMC_CMD_RESP_EXP              BIT(6)
#define SDMMC_CMD_INDX(n)               ((n) & 0x1F)
/* Status register defines */
#define SDMMC_GET_FCNT(x)               (((x)>>17) & 0x1FFF)
#define SDMMC_STATUS_DMA_REQ            BIT(31)
#define SDMMC_STATUS_BUSY               BIT(9)
/* FIFOTH register defines */
#define SDMMC_SET_FIFOTH(m, r, t)       (((m) & 0x7) << 28 | \
                                         ((r) & 0xFFF) << 16 | \
                                         ((t) & 0xFFF))
/* HCON register defines */
#define DMA_INTERFACE_IDMA              (0x0)
#define DMA_INTERFACE_DWDMA             (0x1)
#define DMA_INTERFACE_GDMA              (0x2)
#define DMA_INTERFACE_NODMA             (0x3)
#define SDMMC_GET_TRANS_MODE(x)         (((x)>>16) & 0x3)
#define SDMMC_GET_SLOT_NUM(x)           ((((x)>>1) & 0x1F) + 1)
#define SDMMC_GET_HDATA_WIDTH(x)        (((x)>>7) & 0x7)
#define SDMMC_GET_ADDR_CONFIG(x)        (((x)>>27) & 0x1)
/* Internal DMAC interrupt defines */
#define SDMMC_IDMAC_INT_AI              BIT(9)
#define SDMMC_IDMAC_INT_NI              BIT(8)
#define SDMMC_IDMAC_INT_CES             BIT(5)
#define SDMMC_IDMAC_INT_DU              BIT(4)
#define SDMMC_IDMAC_INT_FBE             BIT(2)
#define SDMMC_IDMAC_INT_RI              BIT(1)
#define SDMMC_IDMAC_INT_TI              BIT(0)
/* Internal DMAC bus mode bits */
#define SDMMC_IDMAC_ENABLE              BIT(7)
#define SDMMC_IDMAC_FB                  BIT(1)
#define SDMMC_IDMAC_SWRESET             BIT(0)
/* H/W reset */
#define SDMMC_RST_HWACTIVE              0x1
/* Version ID register define */
#define SDMMC_GET_VERID(x)              ((x) & 0xFFFF)
/* Card read threshold */
#define SDMMC_SET_THLD(v, x)            (((v) & 0xFFF) << 16 | (x))
#define SDMMC_CARD_WR_THR_EN            BIT(2)
#define SDMMC_CARD_RD_THR_EN            BIT(0)
/* UHS-1 register defines */
#define SDMMC_UHS_DDR                   BIT(16)
#define SDMMC_UHS_18V                   BIT(0)
/* DDR register defines */
#define SDMMC_DDR_HS400                 BIT(31)
/* Enable shift register defines */
#define SDMMC_ENABLE_PHASE              BIT(0)
/* All ctrl reset bits */
#define SDMMC_CTRL_ALL_RESET_FLAGS \
        (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET | SDMMC_CTRL_DMA_RESET)

/* FIFO register access macros. These should not change the data endian-ness
 * as they are written to memory to be dealt with by the upper layers
 */
#define mci_fifo_readw(__reg)   __raw_readw(__reg)
#define mci_fifo_readl(__reg)   __raw_readl(__reg)
#define mci_fifo_readq(__reg)   __raw_readq(__reg)

#define mci_fifo_writew(__value, __reg) __raw_writew(__reg, __value)
#define mci_fifo_writel(__value, __reg) __raw_writel(__reg, __value)
#define mci_fifo_writeq(__value, __reg) __raw_writeq(__reg, __value)

/* Register access macros */
#define mci_readl(dev, reg)                     \
        readl_relaxed((dev)->regs + SDMMC_##reg)
#define mci_writel(dev, reg, value)                     \
        writel_relaxed((value), (dev)->regs + SDMMC_##reg)

/* 16-bit FIFO access macros */
#define mci_readw(dev, reg)                     \
        readw_relaxed((dev)->regs + SDMMC_##reg)
#define mci_writew(dev, reg, value)                     \
        writew_relaxed((value), (dev)->regs + SDMMC_##reg)

/* 64-bit FIFO access macros */
#ifdef readq
#define mci_readq(dev, reg)                     \
        readq_relaxed((dev)->regs + SDMMC_##reg)
#define mci_writeq(dev, reg, value)                     \
        writeq_relaxed((value), (dev)->regs + SDMMC_##reg)
#else
/*
 * Dummy readq implementation for architectures that don't define it.
 *
 * We would assume that none of these architectures would configure
 * the IP block with a 64bit FIFO width, so this code will never be
 * executed on those machines. Defining these macros here keeps the
 * rest of the code free from ifdefs.
 */
#define mci_readq(dev, reg)                     \
        (*(volatile u64 __force *)((dev)->regs + SDMMC_##reg))
#define mci_writeq(dev, reg, value)                     \
        (*(volatile u64 __force *)((dev)->regs + SDMMC_##reg) = (value))

#define __raw_writeq(__value, __reg) \
        (*(volatile u64 __force *)(__reg) = (__value))
#define __raw_readq(__reg) (*(volatile u64 __force *)(__reg))
#endif

extern int dw_mci_probe(struct dw_mci *host);
extern void dw_mci_remove(struct dw_mci *host);
#ifdef CONFIG_PM
extern int dw_mci_runtime_suspend(struct device *device);
extern int dw_mci_runtime_resume(struct device *device);
#endif

/**
 * struct dw_mci_slot - MMC slot state
 * @mmc: The mmc_host representing this slot.
 * @host: The MMC controller this slot is using.
 * @ctype: Card type for this slot.
 * @mrq: mmc_request currently being processed or waiting to be
 *      processed, or NULL when the slot is idle.
 * @queue_node: List node for placing this node in the @queue list of
 *      &struct dw_mci.
 * @clock: Clock rate configured by set_ios(). Protected by host->lock.
 * @__clk_old: The last clock value that was requested from core.
 *      Keeping track of this helps us to avoid spamming the console.
 * @flags: Random state bits associated with the slot.
 * @id: Number of this slot.
 * @sdio_id: Number of this slot in the SDIO interrupt registers.
 */
struct dw_mci_slot {
        struct mmc_host         *mmc;
        struct dw_mci           *host;

        u32                     ctype;

        struct mmc_request      *mrq;
        struct list_head        queue_node;

        unsigned int            clock;
        unsigned int            __clk_old;

        unsigned long           flags;
#define DW_MMC_CARD_PRESENT     0
#define DW_MMC_CARD_NEED_INIT   1
#define DW_MMC_CARD_NO_LOW_PWR  2
#define DW_MMC_CARD_NO_USE_HOLD 3
#define DW_MMC_CARD_NEEDS_POLL  4
        int                     id;
        int                     sdio_id;
};

/**
 * dw_mci driver data - dw-mshc implementation specific driver data.
 * @caps: mmc subsystem specified capabilities of the controller(s).
 * @num_caps: number of capabilities specified by @caps.
 * @init: early implementation specific initialization.
 * @set_ios: handle bus specific extensions.
 * @parse_dt: parse implementation specific device tree properties.
 * @execute_tuning: implementation specific tuning procedure.
 *
 * Provide controller implementation specific extensions. The usage of this
 * data structure is fully optional and usage of each member in this structure
 * is optional as well.
 */
struct dw_mci_drv_data {
        unsigned long   *caps;
        u32             num_caps;
        int             (*init)(struct dw_mci *host);
        void            (*set_ios)(struct dw_mci *host, struct mmc_ios *ios);
        int             (*parse_dt)(struct dw_mci *host);
        int             (*execute_tuning)(struct dw_mci_slot *slot, u32 opcode);
        int             (*prepare_hs400_tuning)(struct dw_mci *host,
                                                struct mmc_ios *ios);
        int             (*switch_voltage)(struct mmc_host *mmc,
                                          struct mmc_ios *ios);
};
#endif /* _DW_MMC_H_ */