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/*
* 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 _LINUX_MMC_DW_MMC_H_
#define _LINUX_MMC_DW_MMC_H_
#define MAX_MCI_SLOTS 2
enum dw_mci_state {
STATE_IDLE = 0,
STATE_SENDING_CMD,
STATE_SENDING_DATA,
STATE_DATA_BUSY,
STATE_SENDING_STOP,
STATE_DATA_ERROR,
};
enum {
EVENT_CMD_COMPLETE = 0,
EVENT_XFER_COMPLETE,
EVENT_DATA_COMPLETE,
EVENT_DATA_ERROR,
EVENT_XFER_ERROR
};
struct mmc_data;
/**
* struct dw_mci - MMC controller state shared between all slots
* @lock: Spinlock protecting the queue and associated data.
* @regs: Pointer to MMIO registers.
* @sg: Scatterlist entry currently being processed by PIO code, if any.
* @pio_offset: Offset into the current scatterlist entry.
* @cur_slot: The slot which is currently using the controller.
* @mrq: The request currently being processed on @cur_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.
* @use_dma: Whether DMA channel is initialized 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
* command. Only valid when EVENT_CMD_COMPLETE is pending.
* @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.
* @card_tasklet: Tasklet handling card detect.
* @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.
* @num_slots: Number of slots available.
* @pdev: Platform device associated with the MMC controller.
* @pdata: Platform data associated with the MMC controller.
* @slot: Slots sharing this MMC controller.
* @data_shift: log2 of FIFO item size.
* @push_data: Pointer to FIFO push function.
* @pull_data: Pointer to FIFO pull function.
* @quirks: Set of quirks that apply to specific versions of the IP.
*
* Locking
* =======
*
* @lock is a softirq-safe spinlock protecting @queue as well as
* @cur_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.
*
* @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 interupt 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;
void __iomem *regs;
struct scatterlist *sg;
unsigned int pio_offset;
struct dw_mci_slot *cur_slot;
struct mmc_request *mrq;
struct mmc_command *cmd;
struct mmc_data *data;
/* DMA interface members*/
int use_dma;
dma_addr_t sg_dma;
void *sg_cpu;
struct dw_mci_dma_ops *dma_ops;
#ifdef CONFIG_MMC_DW_IDMAC
unsigned int ring_size;
#else
struct dw_mci_dma_data *dma_data;
#endif
u32 cmd_status;
u32 data_status;
u32 stop_cmdr;
u32 dir_status;
struct tasklet_struct tasklet;
struct tasklet_struct card_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 num_slots;
struct platform_device *pdev;
struct dw_mci_board *pdata;
struct dw_mci_slot *slot[MAX_MCI_SLOTS];
/* FIFO push and pull */
int data_shift;
void (*push_data)(struct dw_mci *host, void *buf, int cnt);
void (*pull_data)(struct dw_mci *host, void *buf, int cnt);
/* Workaround flags */
u32 quirks;
};
/* DMA ops for Internal/External DMAC interface */
struct dw_mci_dma_ops {
/* DMA Ops */
int (*init)(struct dw_mci *host);
void (*start)(struct dw_mci *host, unsigned int sg_len);
void (*complete)(struct dw_mci *host);
void (*stop)(struct dw_mci *host);
void (*cleanup)(struct dw_mci *host);
void (*exit)(struct dw_mci *host);
};
/* IP Quirks/flags. */
/* No special quirks or flags to cater for */
#define DW_MCI_QUIRK_NONE 0
/* DTO fix for command transmission with IDMAC configured */
#define DW_MCI_QUIRK_IDMAC_DTO 1
/* delay needed between retries on some 2.11a implementations */
#define DW_MCI_QUIRK_RETRY_DELAY 2
/* High Speed Capable - Supports HS cards (upto 50MHz) */
#define DW_MCI_QUIRK_HIGHSPEED 4
struct dma_pdata;
struct block_settings {
unsigned short max_segs; /* see blk_queue_max_segments */
unsigned int max_blk_size; /* maximum size of one mmc block */
unsigned int max_blk_count; /* maximum number of blocks in one req*/
unsigned int max_req_size; /* maximum number of bytes in one req*/
unsigned int max_seg_size; /* see blk_queue_max_segment_size */
};
/* Board platform data */
struct dw_mci_board {
u32 num_slots;
u32 quirks; /* Workaround / Quirk flags */
unsigned int bus_hz; /* Bus speed */
/* delay in mS before detecting cards after interrupt */
u32 detect_delay_ms;
int (*init)(u32 slot_id, irq_handler_t , void *);
int (*get_ro)(u32 slot_id);
int (*get_cd)(u32 slot_id);
int (*get_ocr)(u32 slot_id);
int (*get_bus_wd)(u32 slot_id);
/*
* Enable power to selected slot and set voltage to desired level.
* Voltage levels are specified using MMC_VDD_xxx defines defined
* in linux/mmc/host.h file.
*/
void (*setpower)(u32 slot_id, u32 volt);
void (*exit)(u32 slot_id);
void (*select_slot)(u32 slot_id);
struct dw_mci_dma_ops *dma_ops;
struct dma_pdata *data;
struct block_settings *blk_settings;
};
#endif /* _LINUX_MMC_DW_MMC_H_ */
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