| /* |
| * 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 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; |
| 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; |
| u32 fifoth_val; |
| 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; |
| |
| struct regulator *vmmc; /* Power regulator */ |
| }; |
| |
| /* 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. */ |
| /* DTO fix for command transmission with IDMAC configured */ |
| #define DW_MCI_QUIRK_IDMAC_DTO BIT(0) |
| /* delay needed between retries on some 2.11a implementations */ |
| #define DW_MCI_QUIRK_RETRY_DELAY BIT(1) |
| /* High Speed Capable - Supports HS cards (up to 50MHz) */ |
| #define DW_MCI_QUIRK_HIGHSPEED BIT(2) |
| /* Unreliable card detection */ |
| #define DW_MCI_QUIRK_BROKEN_CARD_DETECTION BIT(3) |
| |
| |
| 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 */ |
| |
| unsigned int caps; /* Capabilities */ |
| |
| /* 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 */ |