include/linux/mmc/dw_mmc.h

   1 /*
   2  * Synopsys DesignWare Multimedia Card Interface driver
   3  *  (Based on NXP driver for lpc 31xx)
   4  *
   5  * Copyright (C) 2009 NXP Semiconductors
   6  * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #ifndef LINUX_MMC_DW_MMC_H
  15 #define LINUX_MMC_DW_MMC_H
  16
  17 #include <linux/scatterlist.h>
  18
  19 #define MAX_MCI_SLOTS   2
  20
  21 enum dw_mci_state {
  22         STATE_IDLE = 0,
  23         STATE_SENDING_CMD,
  24         STATE_SENDING_DATA,
  25         STATE_DATA_BUSY,
  26         STATE_SENDING_STOP,
  27         STATE_DATA_ERROR,
  28 };
  29
  30 enum {
  31         EVENT_CMD_COMPLETE = 0,
  32         EVENT_XFER_COMPLETE,
  33         EVENT_DATA_COMPLETE,
  34         EVENT_DATA_ERROR,
  35         EVENT_XFER_ERROR
  36 };
  37
  38 struct mmc_data;
  39
  40 /**
  41  * struct dw_mci - MMC controller state shared between all slots
  42  * @lock: Spinlock protecting the queue and associated data.
  43  * @regs: Pointer to MMIO registers.
  44  * @sg: Scatterlist entry currently being processed by PIO code, if any.
  45  * @sg_miter: PIO mapping scatterlist iterator.
  46  * @cur_slot: The slot which is currently using the controller.
  47  * @mrq: The request currently being processed on @cur_slot,
  48  *      or NULL if the controller is idle.
  49  * @cmd: The command currently being sent to the card, or NULL.
  50  * @data: The data currently being transferred, or NULL if no data
  51  *      transfer is in progress.
  52  * @use_dma: Whether DMA channel is initialized or not.
  53  * @using_dma: Whether DMA is in use for the current transfer.
  54  * @sg_dma: Bus address of DMA buffer.
  55  * @sg_cpu: Virtual address of DMA buffer.
  56  * @dma_ops: Pointer to platform-specific DMA callbacks.
  57  * @cmd_status: Snapshot of SR taken upon completion of the current
  58  *      command. Only valid when EVENT_CMD_COMPLETE is pending.
  59  * @data_status: Snapshot of SR taken upon completion of the current
  60  *      data transfer. Only valid when EVENT_DATA_COMPLETE or
  61  *      EVENT_DATA_ERROR is pending.
  62  * @stop_cmdr: Value to be loaded into CMDR when the stop command is
  63  *      to be sent.
  64  * @dir_status: Direction of current transfer.
  65  * @tasklet: Tasklet running the request state machine.
  66  * @card_tasklet: Tasklet handling card detect.
  67  * @pending_events: Bitmask of events flagged by the interrupt handler
  68  *      to be processed by the tasklet.
  69  * @completed_events: Bitmask of events which the state machine has
  70  *      processed.
  71  * @state: Tasklet state.
  72  * @queue: List of slots waiting for access to the controller.
  73  * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
  74  *      rate and timeout calculations.
  75  * @current_speed: Configured rate of the controller.
  76  * @num_slots: Number of slots available.
  77  * @verid: Denote Version ID.
  78  * @data_offset: Set the offset of DATA register according to VERID.
  79  * @dev: Device associated with the MMC controller.
  80  * @pdata: Platform data associated with the MMC controller.
  81  * @biu_clk: Pointer to bus interface unit clock instance.
  82  * @ciu_clk: Pointer to card interface unit clock instance.
  83  * @slot: Slots sharing this MMC controller.
  84  * @fifo_depth: depth of FIFO.
  85  * @data_shift: log2 of FIFO item size.
  86  * @part_buf_start: Start index in part_buf.
  87  * @part_buf_count: Bytes of partial data in part_buf.
  88  * @part_buf: Simple buffer for partial fifo reads/writes.
  89  * @push_data: Pointer to FIFO push function.
  90  * @pull_data: Pointer to FIFO pull function.
  91  * @quirks: Set of quirks that apply to specific versions of the IP.
  92  * @irq_flags: The flags to be passed to request_irq.
  93  * @irq: The irq value to be passed to request_irq.
  94  *
  95  * Locking
  96  * =======
  97  *
  98  * @lock is a softirq-safe spinlock protecting @queue as well as
  99  * @cur_slot, @mrq and @state. These must always be updated
 100  * at the same time while holding @lock.
 101  *
 102  * The @mrq field of struct dw_mci_slot is also protected by @lock,
 103  * and must always be written at the same time as the slot is added to
 104  * @queue.
 105  *
 106  * @pending_events and @completed_events are accessed using atomic bit
 107  * operations, so they don't need any locking.
 108  *
 109  * None of the fields touched by the interrupt handler need any
 110  * locking. However, ordering is important: Before EVENT_DATA_ERROR or
 111  * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
 112  * interrupts must be disabled and @data_status updated with a
 113  * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
 114  * CMDRDY interrupt must be disabled and @cmd_status updated with a
 115  * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
 116  * bytes_xfered field of @data must be written. This is ensured by
 117  * using barriers.
 118  */
 119 struct dw_mci {
 120         spinlock_t              lock;
 121         void __iomem            *regs;
 122
 123         struct scatterlist      *sg;
 124         struct sg_mapping_iter  sg_miter;
 125
 126         struct dw_mci_slot      *cur_slot;
 127         struct mmc_request      *mrq;
 128         struct mmc_command      *cmd;
 129         struct mmc_data         *data;
 130         struct workqueue_struct *card_workqueue;
 131
 132         /* DMA interface members*/
 133         int                     use_dma;
 134         int                     using_dma;
 135
 136         dma_addr_t              sg_dma;
 137         void                    *sg_cpu;
 138         struct dw_mci_dma_ops   *dma_ops;
 139 #ifdef CONFIG_MMC_DW_IDMAC
 140         unsigned int            ring_size;
 141 #else
 142         struct dw_mci_dma_data  *dma_data;
 143 #endif
 144         u32                     cmd_status;
 145         u32                     data_status;
 146         u32                     stop_cmdr;
 147         u32                     dir_status;
 148         struct tasklet_struct   tasklet;
 149         struct work_struct      card_work;
 150         unsigned long           pending_events;
 151         unsigned long           completed_events;
 152         enum dw_mci_state       state;
 153         struct list_head        queue;
 154
 155         u32                     bus_hz;
 156         u32                     current_speed;
 157         u32                     num_slots;
 158         u32                     fifoth_val;
 159         u16                     verid;
 160         u16                     data_offset;
 161         struct device           *dev;
 162         struct dw_mci_board     *pdata;
 163         struct clk              *biu_clk;
 164         struct clk              *ciu_clk;
 165         struct dw_mci_slot      *slot[MAX_MCI_SLOTS];
 166
 167         /* FIFO push and pull */
 168         int                     fifo_depth;
 169         int                     data_shift;
 170         u8                      part_buf_start;
 171         u8                      part_buf_count;
 172         union {
 173                 u16             part_buf16;
 174                 u32             part_buf32;
 175                 u64             part_buf;
 176         };
 177         void (*push_data)(struct dw_mci *host, void *buf, int cnt);
 178         void (*pull_data)(struct dw_mci *host, void *buf, int cnt);
 179
 180         /* Workaround flags */
 181         u32                     quirks;
 182
 183         struct regulator        *vmmc;  /* Power regulator */
 184         unsigned long           irq_flags; /* IRQ flags */
 185         unsigned int            irq;
 186 };
 187
 188 /* DMA ops for Internal/External DMAC interface */
 189 struct dw_mci_dma_ops {
 190         /* DMA Ops */
 191         int (*init)(struct dw_mci *host);
 192         void (*start)(struct dw_mci *host, unsigned int sg_len);
 193         void (*complete)(struct dw_mci *host);
 194         void (*stop)(struct dw_mci *host);
 195         void (*cleanup)(struct dw_mci *host);
 196         void (*exit)(struct dw_mci *host);
 197 };
 198
 199 /* IP Quirks/flags. */
 200 /* DTO fix for command transmission with IDMAC configured */
 201 #define DW_MCI_QUIRK_IDMAC_DTO                  BIT(0)
 202 /* delay needed between retries on some 2.11a implementations */
 203 #define DW_MCI_QUIRK_RETRY_DELAY                BIT(1)
 204 /* High Speed Capable - Supports HS cards (up to 50MHz) */
 205 #define DW_MCI_QUIRK_HIGHSPEED                  BIT(2)
 206 /* Unreliable card detection */
 207 #define DW_MCI_QUIRK_BROKEN_CARD_DETECTION      BIT(3)
 208 /* Write Protect detection not available */
 209 #define DW_MCI_QUIRK_NO_WRITE_PROTECT           BIT(4)
 210
 211 struct dma_pdata;
 212
 213 struct block_settings {
 214         unsigned short  max_segs;       /* see blk_queue_max_segments */
 215         unsigned int    max_blk_size;   /* maximum size of one mmc block */
 216         unsigned int    max_blk_count;  /* maximum number of blocks in one req*/
 217         unsigned int    max_req_size;   /* maximum number of bytes in one req*/
 218         unsigned int    max_seg_size;   /* see blk_queue_max_segment_size */
 219 };
 220
 221 /* Board platform data */
 222 struct dw_mci_board {
 223         u32 num_slots;
 224
 225         u32 quirks; /* Workaround / Quirk flags */
 226         unsigned int bus_hz; /* Bus speed */
 227
 228         unsigned int caps;      /* Capabilities */
 229         unsigned int caps2;     /* More capabilities */
 230         /*
 231          * Override fifo depth. If 0, autodetect it from the FIFOTH register,
 232          * but note that this may not be reliable after a bootloader has used
 233          * it.
 234          */
 235         unsigned int fifo_depth;
 236
 237         /* delay in mS before detecting cards after interrupt */
 238         u32 detect_delay_ms;
 239
 240         int (*init)(u32 slot_id, irq_handler_t , void *);
 241         int (*get_ro)(u32 slot_id);
 242         int (*get_cd)(u32 slot_id);
 243         int (*get_ocr)(u32 slot_id);
 244         int (*get_bus_wd)(u32 slot_id);
 245         /*
 246          * Enable power to selected slot and set voltage to desired level.
 247          * Voltage levels are specified using MMC_VDD_xxx defines defined
 248          * in linux/mmc/host.h file.
 249          */
 250         void (*setpower)(u32 slot_id, u32 volt);
 251         void (*exit)(u32 slot_id);
 252         void (*select_slot)(u32 slot_id);
 253
 254         struct dw_mci_dma_ops *dma_ops;
 255         struct dma_pdata *data;
 256         struct block_settings *blk_settings;
 257 };
 258
 259 #endif /* LINUX_MMC_DW_MMC_H */