drivers/mmc/host/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 _DW_MMC_H_
  15 #define _DW_MMC_H_
  16
  17 #include <linux/scatterlist.h>
  18 #include <linux/mmc/core.h>
  19 #include <linux/dmaengine.h>
  20 #include <linux/reset.h>
  21 #include <linux/interrupt.h>
  22
  23 enum dw_mci_state {
  24         STATE_IDLE = 0,
  25         STATE_SENDING_CMD,
  26         STATE_SENDING_DATA,
  27         STATE_DATA_BUSY,
  28         STATE_SENDING_STOP,
  29         STATE_DATA_ERROR,
  30         STATE_SENDING_CMD11,
  31         STATE_WAITING_CMD11_DONE,
  32 };
  33
  34 enum {
  35         EVENT_CMD_COMPLETE = 0,
  36         EVENT_XFER_COMPLETE,
  37         EVENT_DATA_COMPLETE,
  38         EVENT_DATA_ERROR,
  39 };
  40
  41 enum dw_mci_cookie {
  42         COOKIE_UNMAPPED,
  43         COOKIE_PRE_MAPPED,      /* mapped by pre_req() of dwmmc */
  44         COOKIE_MAPPED,          /* mapped by prepare_data() of dwmmc */
  45 };
  46
  47 struct mmc_data;
  48
  49 enum {
  50         TRANS_MODE_PIO = 0,
  51         TRANS_MODE_IDMAC,
  52         TRANS_MODE_EDMAC
  53 };
  54
  55 struct dw_mci_dma_slave {
  56         struct dma_chan *ch;
  57         enum dma_transfer_direction direction;
  58 };
  59
  60 /**
  61  * struct dw_mci - MMC controller state shared between all slots
  62  * @lock: Spinlock protecting the queue and associated data.
  63  * @irq_lock: Spinlock protecting the INTMASK setting.
  64  * @regs: Pointer to MMIO registers.
  65  * @fifo_reg: Pointer to MMIO registers for data FIFO
  66  * @sg: Scatterlist entry currently being processed by PIO code, if any.
  67  * @sg_miter: PIO mapping scatterlist iterator.
  68  * @cur_slot: The slot which is currently using the controller.
  69  * @mrq: The request currently being processed on @cur_slot,
  70  *      or NULL if the controller is idle.
  71  * @cmd: The command currently being sent to the card, or NULL.
  72  * @data: The data currently being transferred, or NULL if no data
  73  *      transfer is in progress.
  74  * @stop_abort: The command currently prepared for stoping transfer.
  75  * @prev_blksz: The former transfer blksz record.
  76  * @timing: Record of current ios timing.
  77  * @use_dma: Whether DMA channel is initialized or not.
  78  * @using_dma: Whether DMA is in use for the current transfer.
  79  * @dma_64bit_address: Whether DMA supports 64-bit address mode or not.
  80  * @sg_dma: Bus address of DMA buffer.
  81  * @sg_cpu: Virtual address of DMA buffer.
  82  * @dma_ops: Pointer to platform-specific DMA callbacks.
  83  * @cmd_status: Snapshot of SR taken upon completion of the current
  84  * @ring_size: Buffer size for idma descriptors.
  85  *      command. Only valid when EVENT_CMD_COMPLETE is pending.
  86  * @dms: structure of slave-dma private data.
  87  * @phy_regs: physical address of controller's register map
  88  * @data_status: Snapshot of SR taken upon completion of the current
  89  *      data transfer. Only valid when EVENT_DATA_COMPLETE or
  90  *      EVENT_DATA_ERROR is pending.
  91  * @stop_cmdr: Value to be loaded into CMDR when the stop command is
  92  *      to be sent.
  93  * @dir_status: Direction of current transfer.
  94  * @tasklet: Tasklet running the request state machine.
  95  * @pending_events: Bitmask of events flagged by the interrupt handler
  96  *      to be processed by the tasklet.
  97  * @completed_events: Bitmask of events which the state machine has
  98  *      processed.
  99  * @state: Tasklet state.
 100  * @queue: List of slots waiting for access to the controller.
 101  * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
 102  *      rate and timeout calculations.
 103  * @current_speed: Configured rate of the controller.
 104  * @num_slots: Number of slots available.
 105  * @fifoth_val: The value of FIFOTH register.
 106  * @verid: Denote Version ID.
 107  * @dev: Device associated with the MMC controller.
 108  * @pdata: Platform data associated with the MMC controller.
 109  * @drv_data: Driver specific data for identified variant of the controller
 110  * @priv: Implementation defined private data.
 111  * @biu_clk: Pointer to bus interface unit clock instance.
 112  * @ciu_clk: Pointer to card interface unit clock instance.
 113  * @slot: Slots sharing this MMC controller.
 114  * @fifo_depth: depth of FIFO.
 115  * @data_addr_override: override fifo reg offset with this value.
 116  * @wm_aligned: force fifo watermark equal with data length in PIO mode.
 117  *      Set as true if alignment is needed.
 118  * @data_shift: log2 of FIFO item size.
 119  * @part_buf_start: Start index in part_buf.
 120  * @part_buf_count: Bytes of partial data in part_buf.
 121  * @part_buf: Simple buffer for partial fifo reads/writes.
 122  * @push_data: Pointer to FIFO push function.
 123  * @pull_data: Pointer to FIFO pull function.
 124  * @vqmmc_enabled: Status of vqmmc, should be true or false.
 125  * @irq_flags: The flags to be passed to request_irq.
 126  * @irq: The irq value to be passed to request_irq.
 127  * @sdio_id0: Number of slot0 in the SDIO interrupt registers.
 128  * @cmd11_timer: Timer for SD3.0 voltage switch over scheme.
 129  * @cto_timer: Timer for broken command transfer over scheme.
 130  * @dto_timer: Timer for broken data transfer over scheme.
 131  *
 132  * Locking
 133  * =======
 134  *
 135  * @lock is a softirq-safe spinlock protecting @queue as well as
 136  * at the same time while holding @lock.
 137  *
 138  * @irq_lock is an irq-safe spinlock protecting the INTMASK register
 139  * to allow the interrupt handler to modify it directly.  Held for only long
 140  * enough to read-modify-write INTMASK and no other locks are grabbed when
 141  * holding this one.
 142  *
 143  * The @mrq field of struct dw_mci_slot is also protected by @lock,
 144  * and must always be written at the same time as the slot is added to
 145  * @queue.
 146  *
 147  * @pending_events and @completed_events are accessed using atomic bit
 148  * operations, so they don't need any locking.
 149  *
 150  * None of the fields touched by the interrupt handler need any
 151  * locking. However, ordering is important: Before EVENT_DATA_ERROR or
 152  * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
 153  * interrupts must be disabled and @data_status updated with a
 154  * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
 155  * CMDRDY interrupt must be disabled and @cmd_status updated with a
 156  * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
 157  * bytes_xfered field of @data must be written. This is ensured by
 158  * using barriers.
 159  */
 160 struct dw_mci {
 161         spinlock_t              lock;
 162         spinlock_t              irq_lock;
 163         void __iomem            *regs;
 164         void __iomem            *fifo_reg;
 165         u32                     data_addr_override;
 166         bool                    wm_aligned;
 167
 168         struct scatterlist      *sg;
 169         struct sg_mapping_iter  sg_miter;
 170
 171         struct mmc_request      *mrq;
 172         struct mmc_command      *cmd;
 173         struct mmc_data         *data;
 174         struct mmc_command      stop_abort;
 175         unsigned int            prev_blksz;
 176         unsigned char           timing;
 177
 178         /* DMA interface members*/
 179         int                     use_dma;
 180         int                     using_dma;
 181         int                     dma_64bit_address;
 182
 183         dma_addr_t              sg_dma;
 184         void                    *sg_cpu;
 185         const struct dw_mci_dma_ops     *dma_ops;
 186         /* For idmac */
 187         unsigned int            ring_size;
 188
 189         /* For edmac */
 190         struct dw_mci_dma_slave *dms;
 191         /* Registers's physical base address */
 192         resource_size_t         phy_regs;
 193
 194         u32                     cmd_status;
 195         u32                     data_status;
 196         u32                     stop_cmdr;
 197         u32                     dir_status;
 198         struct tasklet_struct   tasklet;
 199         unsigned long           pending_events;
 200         unsigned long           completed_events;
 201         enum dw_mci_state       state;
 202         struct list_head        queue;
 203
 204         u32                     bus_hz;
 205         u32                     current_speed;
 206         u32                     fifoth_val;
 207         u16                     verid;
 208         struct device           *dev;
 209         struct dw_mci_board     *pdata;
 210         const struct dw_mci_drv_data    *drv_data;
 211         void                    *priv;
 212         struct clk              *biu_clk;
 213         struct clk              *ciu_clk;
 214         struct dw_mci_slot      *slot;
 215
 216         /* FIFO push and pull */
 217         int                     fifo_depth;
 218         int                     data_shift;
 219         u8                      part_buf_start;
 220         u8                      part_buf_count;
 221         union {
 222                 u16             part_buf16;
 223                 u32             part_buf32;
 224                 u64             part_buf;
 225         };
 226         void (*push_data)(struct dw_mci *host, void *buf, int cnt);
 227         void (*pull_data)(struct dw_mci *host, void *buf, int cnt);
 228
 229         bool                    vqmmc_enabled;
 230         unsigned long           irq_flags; /* IRQ flags */
 231         int                     irq;
 232
 233         int                     sdio_id0;
 234
 235         struct timer_list       cmd11_timer;
 236         struct timer_list       cto_timer;
 237         struct timer_list       dto_timer;
 238 };
 239
 240 /* DMA ops for Internal/External DMAC interface */
 241 struct dw_mci_dma_ops {
 242         /* DMA Ops */
 243         int (*init)(struct dw_mci *host);
 244         int (*start)(struct dw_mci *host, unsigned int sg_len);
 245         void (*complete)(void *host);
 246         void (*stop)(struct dw_mci *host);
 247         void (*cleanup)(struct dw_mci *host);
 248         void (*exit)(struct dw_mci *host);
 249 };
 250
 251 struct dma_pdata;
 252
 253 /* Board platform data */
 254 struct dw_mci_board {
 255         u32 num_slots;
 256
 257         unsigned int bus_hz; /* Clock speed at the cclk_in pad */
 258
 259         u32 caps;       /* Capabilities */
 260         u32 caps2;      /* More capabilities */
 261         u32 pm_caps;    /* PM capabilities */
 262         /*
 263          * Override fifo depth. If 0, autodetect it from the FIFOTH register,
 264          * but note that this may not be reliable after a bootloader has used
 265          * it.
 266          */
 267         unsigned int fifo_depth;
 268
 269         /* delay in mS before detecting cards after interrupt */
 270         u32 detect_delay_ms;
 271
 272         struct reset_control *rstc;
 273         struct dw_mci_dma_ops *dma_ops;
 274         struct dma_pdata *data;
 275 };
 276
 277 #define DW_MMC_240A             0x240a
 278 #define DW_MMC_280A             0x280a
 279
 280 #define SDMMC_CTRL              0x000
 281 #define SDMMC_PWREN             0x004
 282 #define SDMMC_CLKDIV            0x008
 283 #define SDMMC_CLKSRC            0x00c
 284 #define SDMMC_CLKENA            0x010
 285 #define SDMMC_TMOUT             0x014
 286 #define SDMMC_CTYPE             0x018
 287 #define SDMMC_BLKSIZ            0x01c
 288 #define SDMMC_BYTCNT            0x020
 289 #define SDMMC_INTMASK           0x024
 290 #define SDMMC_CMDARG            0x028
 291 #define SDMMC_CMD               0x02c
 292 #define SDMMC_RESP0             0x030
 293 #define SDMMC_RESP1             0x034
 294 #define SDMMC_RESP2             0x038
 295 #define SDMMC_RESP3             0x03c
 296 #define SDMMC_MINTSTS           0x040
 297 #define SDMMC_RINTSTS           0x044
 298 #define SDMMC_STATUS            0x048
 299 #define SDMMC_FIFOTH            0x04c
 300 #define SDMMC_CDETECT           0x050
 301 #define SDMMC_WRTPRT            0x054
 302 #define SDMMC_GPIO              0x058
 303 #define SDMMC_TCBCNT            0x05c
 304 #define SDMMC_TBBCNT            0x060
 305 #define SDMMC_DEBNCE            0x064
 306 #define SDMMC_USRID             0x068
 307 #define SDMMC_VERID             0x06c
 308 #define SDMMC_HCON              0x070
 309 #define SDMMC_UHS_REG           0x074
 310 #define SDMMC_RST_N             0x078
 311 #define SDMMC_BMOD              0x080
 312 #define SDMMC_PLDMND            0x084
 313 #define SDMMC_DBADDR            0x088
 314 #define SDMMC_IDSTS             0x08c
 315 #define SDMMC_IDINTEN           0x090
 316 #define SDMMC_DSCADDR           0x094
 317 #define SDMMC_BUFADDR           0x098
 318 #define SDMMC_CDTHRCTL          0x100
 319 #define SDMMC_UHS_REG_EXT       0x108
 320 #define SDMMC_ENABLE_SHIFT      0x110
 321 #define SDMMC_DATA(x)           (x)
 322 /*
 323 * Registers to support idmac 64-bit address mode
 324 */
 325 #define SDMMC_DBADDRL           0x088
 326 #define SDMMC_DBADDRU           0x08c
 327 #define SDMMC_IDSTS64           0x090
 328 #define SDMMC_IDINTEN64         0x094
 329 #define SDMMC_DSCADDRL          0x098
 330 #define SDMMC_DSCADDRU          0x09c
 331 #define SDMMC_BUFADDRL          0x0A0
 332 #define SDMMC_BUFADDRU          0x0A4
 333
 334 /*
 335  * Data offset is difference according to Version
 336  * Lower than 2.40a : data register offest is 0x100
 337  */
 338 #define DATA_OFFSET             0x100
 339 #define DATA_240A_OFFSET        0x200
 340
 341 /* shift bit field */
 342 #define _SBF(f, v)              ((v) << (f))
 343
 344 /* Control register defines */
 345 #define SDMMC_CTRL_USE_IDMAC            BIT(25)
 346 #define SDMMC_CTRL_CEATA_INT_EN         BIT(11)
 347 #define SDMMC_CTRL_SEND_AS_CCSD         BIT(10)
 348 #define SDMMC_CTRL_SEND_CCSD            BIT(9)
 349 #define SDMMC_CTRL_ABRT_READ_DATA       BIT(8)
 350 #define SDMMC_CTRL_SEND_IRQ_RESP        BIT(7)
 351 #define SDMMC_CTRL_READ_WAIT            BIT(6)
 352 #define SDMMC_CTRL_DMA_ENABLE           BIT(5)
 353 #define SDMMC_CTRL_INT_ENABLE           BIT(4)
 354 #define SDMMC_CTRL_DMA_RESET            BIT(2)
 355 #define SDMMC_CTRL_FIFO_RESET           BIT(1)
 356 #define SDMMC_CTRL_RESET                BIT(0)
 357 /* Clock Enable register defines */
 358 #define SDMMC_CLKEN_LOW_PWR             BIT(16)
 359 #define SDMMC_CLKEN_ENABLE              BIT(0)
 360 /* time-out register defines */
 361 #define SDMMC_TMOUT_DATA(n)             _SBF(8, (n))
 362 #define SDMMC_TMOUT_DATA_MSK            0xFFFFFF00
 363 #define SDMMC_TMOUT_RESP(n)             ((n) & 0xFF)
 364 #define SDMMC_TMOUT_RESP_MSK            0xFF
 365 /* card-type register defines */
 366 #define SDMMC_CTYPE_8BIT                BIT(16)
 367 #define SDMMC_CTYPE_4BIT                BIT(0)
 368 #define SDMMC_CTYPE_1BIT                0
 369 /* Interrupt status & mask register defines */
 370 #define SDMMC_INT_SDIO(n)               BIT(16 + (n))
 371 #define SDMMC_INT_EBE                   BIT(15)
 372 #define SDMMC_INT_ACD                   BIT(14)
 373 #define SDMMC_INT_SBE                   BIT(13)
 374 #define SDMMC_INT_HLE                   BIT(12)
 375 #define SDMMC_INT_FRUN                  BIT(11)
 376 #define SDMMC_INT_HTO                   BIT(10)
 377 #define SDMMC_INT_VOLT_SWITCH           BIT(10) /* overloads bit 10! */
 378 #define SDMMC_INT_DRTO                  BIT(9)
 379 #define SDMMC_INT_RTO                   BIT(8)
 380 #define SDMMC_INT_DCRC                  BIT(7)
 381 #define SDMMC_INT_RCRC                  BIT(6)
 382 #define SDMMC_INT_RXDR                  BIT(5)
 383 #define SDMMC_INT_TXDR                  BIT(4)
 384 #define SDMMC_INT_DATA_OVER             BIT(3)
 385 #define SDMMC_INT_CMD_DONE              BIT(2)
 386 #define SDMMC_INT_RESP_ERR              BIT(1)
 387 #define SDMMC_INT_CD                    BIT(0)
 388 #define SDMMC_INT_ERROR                 0xbfc2
 389 /* Command register defines */
 390 #define SDMMC_CMD_START                 BIT(31)
 391 #define SDMMC_CMD_USE_HOLD_REG  BIT(29)
 392 #define SDMMC_CMD_VOLT_SWITCH           BIT(28)
 393 #define SDMMC_CMD_CCS_EXP               BIT(23)
 394 #define SDMMC_CMD_CEATA_RD              BIT(22)
 395 #define SDMMC_CMD_UPD_CLK               BIT(21)
 396 #define SDMMC_CMD_INIT                  BIT(15)
 397 #define SDMMC_CMD_STOP                  BIT(14)
 398 #define SDMMC_CMD_PRV_DAT_WAIT          BIT(13)
 399 #define SDMMC_CMD_SEND_STOP             BIT(12)
 400 #define SDMMC_CMD_STRM_MODE             BIT(11)
 401 #define SDMMC_CMD_DAT_WR                BIT(10)
 402 #define SDMMC_CMD_DAT_EXP               BIT(9)
 403 #define SDMMC_CMD_RESP_CRC              BIT(8)
 404 #define SDMMC_CMD_RESP_LONG             BIT(7)
 405 #define SDMMC_CMD_RESP_EXP              BIT(6)
 406 #define SDMMC_CMD_INDX(n)               ((n) & 0x1F)
 407 /* Status register defines */
 408 #define SDMMC_GET_FCNT(x)               (((x)>>17) & 0x1FFF)
 409 #define SDMMC_STATUS_DMA_REQ            BIT(31)
 410 #define SDMMC_STATUS_BUSY               BIT(9)
 411 /* FIFOTH register defines */
 412 #define SDMMC_SET_FIFOTH(m, r, t)       (((m) & 0x7) << 28 | \
 413                                          ((r) & 0xFFF) << 16 | \
 414                                          ((t) & 0xFFF))
 415 /* HCON register defines */
 416 #define DMA_INTERFACE_IDMA              (0x0)
 417 #define DMA_INTERFACE_DWDMA             (0x1)
 418 #define DMA_INTERFACE_GDMA              (0x2)
 419 #define DMA_INTERFACE_NODMA             (0x3)
 420 #define SDMMC_GET_TRANS_MODE(x)         (((x)>>16) & 0x3)
 421 #define SDMMC_GET_SLOT_NUM(x)           ((((x)>>1) & 0x1F) + 1)
 422 #define SDMMC_GET_HDATA_WIDTH(x)        (((x)>>7) & 0x7)
 423 #define SDMMC_GET_ADDR_CONFIG(x)        (((x)>>27) & 0x1)
 424 /* Internal DMAC interrupt defines */
 425 #define SDMMC_IDMAC_INT_AI              BIT(9)
 426 #define SDMMC_IDMAC_INT_NI              BIT(8)
 427 #define SDMMC_IDMAC_INT_CES             BIT(5)
 428 #define SDMMC_IDMAC_INT_DU              BIT(4)
 429 #define SDMMC_IDMAC_INT_FBE             BIT(2)
 430 #define SDMMC_IDMAC_INT_RI              BIT(1)
 431 #define SDMMC_IDMAC_INT_TI              BIT(0)
 432 /* Internal DMAC bus mode bits */
 433 #define SDMMC_IDMAC_ENABLE              BIT(7)
 434 #define SDMMC_IDMAC_FB                  BIT(1)
 435 #define SDMMC_IDMAC_SWRESET             BIT(0)
 436 /* H/W reset */
 437 #define SDMMC_RST_HWACTIVE              0x1
 438 /* Version ID register define */
 439 #define SDMMC_GET_VERID(x)              ((x) & 0xFFFF)
 440 /* Card read threshold */
 441 #define SDMMC_SET_THLD(v, x)            (((v) & 0xFFF) << 16 | (x))
 442 #define SDMMC_CARD_WR_THR_EN            BIT(2)
 443 #define SDMMC_CARD_RD_THR_EN            BIT(0)
 444 /* UHS-1 register defines */
 445 #define SDMMC_UHS_18V                   BIT(0)
 446 /* All ctrl reset bits */
 447 #define SDMMC_CTRL_ALL_RESET_FLAGS \
 448         (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET | SDMMC_CTRL_DMA_RESET)
 449
 450 /* FIFO register access macros. These should not change the data endian-ness
 451  * as they are written to memory to be dealt with by the upper layers */
 452 #define mci_fifo_readw(__reg)   __raw_readw(__reg)
 453 #define mci_fifo_readl(__reg)   __raw_readl(__reg)
 454 #define mci_fifo_readq(__reg)   __raw_readq(__reg)
 455
 456 #define mci_fifo_writew(__value, __reg) __raw_writew(__reg, __value)
 457 #define mci_fifo_writel(__value, __reg) __raw_writel(__reg, __value)
 458 #define mci_fifo_writeq(__value, __reg) __raw_writeq(__reg, __value)
 459
 460 /* Register access macros */
 461 #define mci_readl(dev, reg)                     \
 462         readl_relaxed((dev)->regs + SDMMC_##reg)
 463 #define mci_writel(dev, reg, value)                     \
 464         writel_relaxed((value), (dev)->regs + SDMMC_##reg)
 465
 466 /* 16-bit FIFO access macros */
 467 #define mci_readw(dev, reg)                     \
 468         readw_relaxed((dev)->regs + SDMMC_##reg)
 469 #define mci_writew(dev, reg, value)                     \
 470         writew_relaxed((value), (dev)->regs + SDMMC_##reg)
 471
 472 /* 64-bit FIFO access macros */
 473 #ifdef readq
 474 #define mci_readq(dev, reg)                     \
 475         readq_relaxed((dev)->regs + SDMMC_##reg)
 476 #define mci_writeq(dev, reg, value)                     \
 477         writeq_relaxed((value), (dev)->regs + SDMMC_##reg)
 478 #else
 479 /*
 480  * Dummy readq implementation for architectures that don't define it.
 481  *
 482  * We would assume that none of these architectures would configure
 483  * the IP block with a 64bit FIFO width, so this code will never be
 484  * executed on those machines. Defining these macros here keeps the
 485  * rest of the code free from ifdefs.
 486  */
 487 #define mci_readq(dev, reg)                     \
 488         (*(volatile u64 __force *)((dev)->regs + SDMMC_##reg))
 489 #define mci_writeq(dev, reg, value)                     \
 490         (*(volatile u64 __force *)((dev)->regs + SDMMC_##reg) = (value))
 491
 492 #define __raw_writeq(__value, __reg) \
 493         (*(volatile u64 __force *)(__reg) = (__value))
 494 #define __raw_readq(__reg) (*(volatile u64 __force *)(__reg))
 495 #endif
 496
 497 extern int dw_mci_probe(struct dw_mci *host);
 498 extern void dw_mci_remove(struct dw_mci *host);
 499 #ifdef CONFIG_PM
 500 extern int dw_mci_runtime_suspend(struct device *device);
 501 extern int dw_mci_runtime_resume(struct device *device);
 502 #endif
 503
 504 /**
 505  * struct dw_mci_slot - MMC slot state
 506  * @mmc: The mmc_host representing this slot.
 507  * @host: The MMC controller this slot is using.
 508  * @ctype: Card type for this slot.
 509  * @mrq: mmc_request currently being processed or waiting to be
 510  *      processed, or NULL when the slot is idle.
 511  * @queue_node: List node for placing this node in the @queue list of
 512  *      &struct dw_mci.
 513  * @clock: Clock rate configured by set_ios(). Protected by host->lock.
 514  * @__clk_old: The last clock value that was requested from core.
 515  *      Keeping track of this helps us to avoid spamming the console.
 516  * @flags: Random state bits associated with the slot.
 517  * @id: Number of this slot.
 518  * @sdio_id: Number of this slot in the SDIO interrupt registers.
 519  */
 520 struct dw_mci_slot {
 521         struct mmc_host         *mmc;
 522         struct dw_mci           *host;
 523
 524         u32                     ctype;
 525
 526         struct mmc_request      *mrq;
 527         struct list_head        queue_node;
 528
 529         unsigned int            clock;
 530         unsigned int            __clk_old;
 531
 532         unsigned long           flags;
 533 #define DW_MMC_CARD_PRESENT     0
 534 #define DW_MMC_CARD_NEED_INIT   1
 535 #define DW_MMC_CARD_NO_LOW_PWR  2
 536 #define DW_MMC_CARD_NO_USE_HOLD 3
 537 #define DW_MMC_CARD_NEEDS_POLL  4
 538         int                     id;
 539         int                     sdio_id;
 540 };
 541
 542 /**
 543  * dw_mci driver data - dw-mshc implementation specific driver data.
 544  * @caps: mmc subsystem specified capabilities of the controller(s).
 545  * @init: early implementation specific initialization.
 546  * @set_ios: handle bus specific extensions.
 547  * @parse_dt: parse implementation specific device tree properties.
 548  * @execute_tuning: implementation specific tuning procedure.
 549  *
 550  * Provide controller implementation specific extensions. The usage of this
 551  * data structure is fully optional and usage of each member in this structure
 552  * is optional as well.
 553  */
 554 struct dw_mci_drv_data {
 555         unsigned long   *caps;
 556         int             (*init)(struct dw_mci *host);
 557         void            (*set_ios)(struct dw_mci *host, struct mmc_ios *ios);
 558         int             (*parse_dt)(struct dw_mci *host);
 559         int             (*execute_tuning)(struct dw_mci_slot *slot, u32 opcode);
 560         int             (*prepare_hs400_tuning)(struct dw_mci *host,
 561                                                 struct mmc_ios *ios);
 562         int             (*switch_voltage)(struct mmc_host *mmc,
 563                                           struct mmc_ios *ios);
 564 };
 565 #endif /* _DW_MMC_H_ */