drivers/mmc/host/atmel-mci.c

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This source file includes following definitions.
atmci_req_show
atmci_show_status_reg
atmci_regs_show
atmci_init_debugfs
atmci_of_init
atmci_of_init
atmci_get_version
atmci_convert_chksize
atmci_timeout_timer
atmci_ns_to_clocks
atmci_set_timeout
atmci_prepare_command
atmci_send_command
atmci_send_stop_cmd
atmci_pdc_set_single_buf
atmci_pdc_set_both_buf
atmci_pdc_cleanup
atmci_pdc_complete
atmci_dma_cleanup
atmci_dma_complete
atmci_prepare_data
atmci_prepare_data_pdc
atmci_prepare_data_dma
atmci_submit_data
atmci_submit_data_pdc
atmci_submit_data_dma
atmci_stop_transfer
atmci_stop_transfer_pdc
atmci_stop_transfer_dma
atmci_start_request
atmci_queue_request
atmci_request
atmci_set_ios
atmci_get_ro
atmci_get_cd
atmci_enable_sdio_irq
atmci_request_end
atmci_command_complete
atmci_detect_change
atmci_tasklet_func
atmci_read_data_pio
atmci_write_data_pio
atmci_sdio_interrupt
atmci_interrupt
atmci_detect_interrupt
atmci_init_slot
atmci_cleanup_slot
atmci_configure_dma
atmci_get_cap
atmci_probe
atmci_remove
atmci_runtime_suspend
atmci_runtime_resume
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Atmel MultiMedia Card Interface driver
   4  *
   5  * Copyright (C) 2004-2008 Atmel Corporation
   6  */
   7 #include <linux/blkdev.h>
   8 #include <linux/clk.h>
   9 #include <linux/debugfs.h>
  10 #include <linux/device.h>
  11 #include <linux/dmaengine.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/err.h>
  14 #include <linux/gpio.h>
  15 #include <linux/init.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/io.h>
  18 #include <linux/ioport.h>
  19 #include <linux/module.h>
  20 #include <linux/of.h>
  21 #include <linux/of_device.h>
  22 #include <linux/of_gpio.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/scatterlist.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/slab.h>
  27 #include <linux/stat.h>
  28 #include <linux/types.h>
  29 
  30 #include <linux/mmc/host.h>
  31 #include <linux/mmc/sdio.h>
  32 
  33 #include <linux/atmel-mci.h>
  34 #include <linux/atmel_pdc.h>
  35 #include <linux/pm.h>
  36 #include <linux/pm_runtime.h>
  37 #include <linux/pinctrl/consumer.h>
  38 
  39 #include <asm/cacheflush.h>
  40 #include <asm/io.h>
  41 #include <asm/unaligned.h>
  42 
  43 /*
  44  * Superset of MCI IP registers integrated in Atmel AT91 Processor
  45  * Registers and bitfields marked with [2] are only available in MCI2
  46  */
  47 
  48 /* MCI Register Definitions */
  49 #define ATMCI_CR                        0x0000  /* Control */
  50 #define         ATMCI_CR_MCIEN                  BIT(0)          /* MCI Enable */
  51 #define         ATMCI_CR_MCIDIS                 BIT(1)          /* MCI Disable */
  52 #define         ATMCI_CR_PWSEN                  BIT(2)          /* Power Save Enable */
  53 #define         ATMCI_CR_PWSDIS                 BIT(3)          /* Power Save Disable */
  54 #define         ATMCI_CR_SWRST                  BIT(7)          /* Software Reset */
  55 #define ATMCI_MR                        0x0004  /* Mode */
  56 #define         ATMCI_MR_CLKDIV(x)              ((x) <<  0)     /* Clock Divider */
  57 #define         ATMCI_MR_PWSDIV(x)              ((x) <<  8)     /* Power Saving Divider */
  58 #define         ATMCI_MR_RDPROOF                BIT(11)         /* Read Proof */
  59 #define         ATMCI_MR_WRPROOF                BIT(12)         /* Write Proof */
  60 #define         ATMCI_MR_PDCFBYTE               BIT(13)         /* Force Byte Transfer */
  61 #define         ATMCI_MR_PDCPADV                BIT(14)         /* Padding Value */
  62 #define         ATMCI_MR_PDCMODE                BIT(15)         /* PDC-oriented Mode */
  63 #define         ATMCI_MR_CLKODD(x)              ((x) << 16)     /* LSB of Clock Divider */
  64 #define ATMCI_DTOR                      0x0008  /* Data Timeout */
  65 #define         ATMCI_DTOCYC(x)                 ((x) <<  0)     /* Data Timeout Cycles */
  66 #define         ATMCI_DTOMUL(x)                 ((x) <<  4)     /* Data Timeout Multiplier */
  67 #define ATMCI_SDCR                      0x000c  /* SD Card / SDIO */
  68 #define         ATMCI_SDCSEL_SLOT_A             (0 <<  0)       /* Select SD slot A */
  69 #define         ATMCI_SDCSEL_SLOT_B             (1 <<  0)       /* Select SD slot A */
  70 #define         ATMCI_SDCSEL_MASK               (3 <<  0)
  71 #define         ATMCI_SDCBUS_1BIT               (0 <<  6)       /* 1-bit data bus */
  72 #define         ATMCI_SDCBUS_4BIT               (2 <<  6)       /* 4-bit data bus */
  73 #define         ATMCI_SDCBUS_8BIT               (3 <<  6)       /* 8-bit data bus[2] */
  74 #define         ATMCI_SDCBUS_MASK               (3 <<  6)
  75 #define ATMCI_ARGR                      0x0010  /* Command Argument */
  76 #define ATMCI_CMDR                      0x0014  /* Command */
  77 #define         ATMCI_CMDR_CMDNB(x)             ((x) <<  0)     /* Command Opcode */
  78 #define         ATMCI_CMDR_RSPTYP_NONE          (0 <<  6)       /* No response */
  79 #define         ATMCI_CMDR_RSPTYP_48BIT         (1 <<  6)       /* 48-bit response */
  80 #define         ATMCI_CMDR_RSPTYP_136BIT        (2 <<  6)       /* 136-bit response */
  81 #define         ATMCI_CMDR_SPCMD_INIT           (1 <<  8)       /* Initialization command */
  82 #define         ATMCI_CMDR_SPCMD_SYNC           (2 <<  8)       /* Synchronized command */
  83 #define         ATMCI_CMDR_SPCMD_INT            (4 <<  8)       /* Interrupt command */
  84 #define         ATMCI_CMDR_SPCMD_INTRESP        (5 <<  8)       /* Interrupt response */
  85 #define         ATMCI_CMDR_OPDCMD               (1 << 11)       /* Open Drain */
  86 #define         ATMCI_CMDR_MAXLAT_5CYC          (0 << 12)       /* Max latency 5 cycles */
  87 #define         ATMCI_CMDR_MAXLAT_64CYC         (1 << 12)       /* Max latency 64 cycles */
  88 #define         ATMCI_CMDR_START_XFER           (1 << 16)       /* Start data transfer */
  89 #define         ATMCI_CMDR_STOP_XFER            (2 << 16)       /* Stop data transfer */
  90 #define         ATMCI_CMDR_TRDIR_WRITE          (0 << 18)       /* Write data */
  91 #define         ATMCI_CMDR_TRDIR_READ           (1 << 18)       /* Read data */
  92 #define         ATMCI_CMDR_BLOCK                (0 << 19)       /* Single-block transfer */
  93 #define         ATMCI_CMDR_MULTI_BLOCK          (1 << 19)       /* Multi-block transfer */
  94 #define         ATMCI_CMDR_STREAM               (2 << 19)       /* MMC Stream transfer */
  95 #define         ATMCI_CMDR_SDIO_BYTE            (4 << 19)       /* SDIO Byte transfer */
  96 #define         ATMCI_CMDR_SDIO_BLOCK           (5 << 19)       /* SDIO Block transfer */
  97 #define         ATMCI_CMDR_SDIO_SUSPEND         (1 << 24)       /* SDIO Suspend Command */
  98 #define         ATMCI_CMDR_SDIO_RESUME          (2 << 24)       /* SDIO Resume Command */
  99 #define ATMCI_BLKR                      0x0018  /* Block */
 100 #define         ATMCI_BCNT(x)                   ((x) <<  0)     /* Data Block Count */
 101 #define         ATMCI_BLKLEN(x)                 ((x) << 16)     /* Data Block Length */
 102 #define ATMCI_CSTOR                     0x001c  /* Completion Signal Timeout[2] */
 103 #define         ATMCI_CSTOCYC(x)                ((x) <<  0)     /* CST cycles */
 104 #define         ATMCI_CSTOMUL(x)                ((x) <<  4)     /* CST multiplier */
 105 #define ATMCI_RSPR                      0x0020  /* Response 0 */
 106 #define ATMCI_RSPR1                     0x0024  /* Response 1 */
 107 #define ATMCI_RSPR2                     0x0028  /* Response 2 */
 108 #define ATMCI_RSPR3                     0x002c  /* Response 3 */
 109 #define ATMCI_RDR                       0x0030  /* Receive Data */
 110 #define ATMCI_TDR                       0x0034  /* Transmit Data */
 111 #define ATMCI_SR                        0x0040  /* Status */
 112 #define ATMCI_IER                       0x0044  /* Interrupt Enable */
 113 #define ATMCI_IDR                       0x0048  /* Interrupt Disable */
 114 #define ATMCI_IMR                       0x004c  /* Interrupt Mask */
 115 #define         ATMCI_CMDRDY                    BIT(0)          /* Command Ready */
 116 #define         ATMCI_RXRDY                     BIT(1)          /* Receiver Ready */
 117 #define         ATMCI_TXRDY                     BIT(2)          /* Transmitter Ready */
 118 #define         ATMCI_BLKE                      BIT(3)          /* Data Block Ended */
 119 #define         ATMCI_DTIP                      BIT(4)          /* Data Transfer In Progress */
 120 #define         ATMCI_NOTBUSY                   BIT(5)          /* Data Not Busy */
 121 #define         ATMCI_ENDRX                     BIT(6)          /* End of RX Buffer */
 122 #define         ATMCI_ENDTX                     BIT(7)          /* End of TX Buffer */
 123 #define         ATMCI_SDIOIRQA                  BIT(8)          /* SDIO IRQ in slot A */
 124 #define         ATMCI_SDIOIRQB                  BIT(9)          /* SDIO IRQ in slot B */
 125 #define         ATMCI_SDIOWAIT                  BIT(12)         /* SDIO Read Wait Operation Status */
 126 #define         ATMCI_CSRCV                     BIT(13)         /* CE-ATA Completion Signal Received */
 127 #define         ATMCI_RXBUFF                    BIT(14)         /* RX Buffer Full */
 128 #define         ATMCI_TXBUFE                    BIT(15)         /* TX Buffer Empty */
 129 #define         ATMCI_RINDE                     BIT(16)         /* Response Index Error */
 130 #define         ATMCI_RDIRE                     BIT(17)         /* Response Direction Error */
 131 #define         ATMCI_RCRCE                     BIT(18)         /* Response CRC Error */
 132 #define         ATMCI_RENDE                     BIT(19)         /* Response End Bit Error */
 133 #define         ATMCI_RTOE                      BIT(20)         /* Response Time-Out Error */
 134 #define         ATMCI_DCRCE                     BIT(21)         /* Data CRC Error */
 135 #define         ATMCI_DTOE                      BIT(22)         /* Data Time-Out Error */
 136 #define         ATMCI_CSTOE                     BIT(23)         /* Completion Signal Time-out Error */
 137 #define         ATMCI_BLKOVRE                   BIT(24)         /* DMA Block Overrun Error */
 138 #define         ATMCI_DMADONE                   BIT(25)         /* DMA Transfer Done */
 139 #define         ATMCI_FIFOEMPTY                 BIT(26)         /* FIFO Empty Flag */
 140 #define         ATMCI_XFRDONE                   BIT(27)         /* Transfer Done Flag */
 141 #define         ATMCI_ACKRCV                    BIT(28)         /* Boot Operation Acknowledge Received */
 142 #define         ATMCI_ACKRCVE                   BIT(29)         /* Boot Operation Acknowledge Error */
 143 #define         ATMCI_OVRE                      BIT(30)         /* RX Overrun Error */
 144 #define         ATMCI_UNRE                      BIT(31)         /* TX Underrun Error */
 145 #define ATMCI_DMA                       0x0050  /* DMA Configuration[2] */
 146 #define         ATMCI_DMA_OFFSET(x)             ((x) <<  0)     /* DMA Write Buffer Offset */
 147 #define         ATMCI_DMA_CHKSIZE(x)            ((x) <<  4)     /* DMA Channel Read and Write Chunk Size */
 148 #define         ATMCI_DMAEN                     BIT(8)  /* DMA Hardware Handshaking Enable */
 149 #define ATMCI_CFG                       0x0054  /* Configuration[2] */
 150 #define         ATMCI_CFG_FIFOMODE_1DATA        BIT(0)          /* MCI Internal FIFO control mode */
 151 #define         ATMCI_CFG_FERRCTRL_COR          BIT(4)          /* Flow Error flag reset control mode */
 152 #define         ATMCI_CFG_HSMODE                BIT(8)          /* High Speed Mode */
 153 #define         ATMCI_CFG_LSYNC                 BIT(12)         /* Synchronize on the last block */
 154 #define ATMCI_WPMR                      0x00e4  /* Write Protection Mode[2] */
 155 #define         ATMCI_WP_EN                     BIT(0)          /* WP Enable */
 156 #define         ATMCI_WP_KEY                    (0x4d4349 << 8) /* WP Key */
 157 #define ATMCI_WPSR                      0x00e8  /* Write Protection Status[2] */
 158 #define         ATMCI_GET_WP_VS(x)              ((x) & 0x0f)
 159 #define         ATMCI_GET_WP_VSRC(x)            (((x) >> 8) & 0xffff)
 160 #define ATMCI_VERSION                   0x00FC  /* Version */
 161 #define ATMCI_FIFO_APERTURE             0x0200  /* FIFO Aperture[2] */
 162 
 163 /* This is not including the FIFO Aperture on MCI2 */
 164 #define ATMCI_REGS_SIZE         0x100
 165 
 166 /* Register access macros */
 167 #define atmci_readl(port, reg)                          \
 168         __raw_readl((port)->regs + reg)
 169 #define atmci_writel(port, reg, value)                  \
 170         __raw_writel((value), (port)->regs + reg)
 171 
 172 #define AUTOSUSPEND_DELAY       50
 173 
 174 #define ATMCI_DATA_ERROR_FLAGS  (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
 175 #define ATMCI_DMA_THRESHOLD     16
 176 
 177 enum {
 178         EVENT_CMD_RDY = 0,
 179         EVENT_XFER_COMPLETE,
 180         EVENT_NOTBUSY,
 181         EVENT_DATA_ERROR,
 182 };
 183 
 184 enum atmel_mci_state {
 185         STATE_IDLE = 0,
 186         STATE_SENDING_CMD,
 187         STATE_DATA_XFER,
 188         STATE_WAITING_NOTBUSY,
 189         STATE_SENDING_STOP,
 190         STATE_END_REQUEST,
 191 };
 192 
 193 enum atmci_xfer_dir {
 194         XFER_RECEIVE = 0,
 195         XFER_TRANSMIT,
 196 };
 197 
 198 enum atmci_pdc_buf {
 199         PDC_FIRST_BUF = 0,
 200         PDC_SECOND_BUF,
 201 };
 202 
 203 struct atmel_mci_caps {
 204         bool    has_dma_conf_reg;
 205         bool    has_pdc;
 206         bool    has_cfg_reg;
 207         bool    has_cstor_reg;
 208         bool    has_highspeed;
 209         bool    has_rwproof;
 210         bool    has_odd_clk_div;
 211         bool    has_bad_data_ordering;
 212         bool    need_reset_after_xfer;
 213         bool    need_blksz_mul_4;
 214         bool    need_notbusy_for_read_ops;
 215 };
 216 
 217 struct atmel_mci_dma {
 218         struct dma_chan                 *chan;
 219         struct dma_async_tx_descriptor  *data_desc;
 220 };
 221 
 222 /**
 223  * struct atmel_mci - MMC controller state shared between all slots
 224  * @lock: Spinlock protecting the queue and associated data.
 225  * @regs: Pointer to MMIO registers.
 226  * @sg: Scatterlist entry currently being processed by PIO or PDC code.
 227  * @pio_offset: Offset into the current scatterlist entry.
 228  * @buffer: Buffer used if we don't have the r/w proof capability. We
 229  *      don't have the time to switch pdc buffers so we have to use only
 230  *      one buffer for the full transaction.
 231  * @buf_size: size of the buffer.
 232  * @phys_buf_addr: buffer address needed for pdc.
 233  * @cur_slot: The slot which is currently using the controller.
 234  * @mrq: The request currently being processed on @cur_slot,
 235  *      or NULL if the controller is idle.
 236  * @cmd: The command currently being sent to the card, or NULL.
 237  * @data: The data currently being transferred, or NULL if no data
 238  *      transfer is in progress.
 239  * @data_size: just data->blocks * data->blksz.
 240  * @dma: DMA client state.
 241  * @data_chan: DMA channel being used for the current data transfer.
 242  * @cmd_status: Snapshot of SR taken upon completion of the current
 243  *      command. Only valid when EVENT_CMD_COMPLETE is pending.
 244  * @data_status: Snapshot of SR taken upon completion of the current
 245  *      data transfer. Only valid when EVENT_DATA_COMPLETE or
 246  *      EVENT_DATA_ERROR is pending.
 247  * @stop_cmdr: Value to be loaded into CMDR when the stop command is
 248  *      to be sent.
 249  * @tasklet: Tasklet running the request state machine.
 250  * @pending_events: Bitmask of events flagged by the interrupt handler
 251  *      to be processed by the tasklet.
 252  * @completed_events: Bitmask of events which the state machine has
 253  *      processed.
 254  * @state: Tasklet state.
 255  * @queue: List of slots waiting for access to the controller.
 256  * @need_clock_update: Update the clock rate before the next request.
 257  * @need_reset: Reset controller before next request.
 258  * @timer: Timer to balance the data timeout error flag which cannot rise.
 259  * @mode_reg: Value of the MR register.
 260  * @cfg_reg: Value of the CFG register.
 261  * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
 262  *      rate and timeout calculations.
 263  * @mapbase: Physical address of the MMIO registers.
 264  * @mck: The peripheral bus clock hooked up to the MMC controller.
 265  * @pdev: Platform device associated with the MMC controller.
 266  * @slot: Slots sharing this MMC controller.
 267  * @caps: MCI capabilities depending on MCI version.
 268  * @prepare_data: function to setup MCI before data transfer which
 269  * depends on MCI capabilities.
 270  * @submit_data: function to start data transfer which depends on MCI
 271  * capabilities.
 272  * @stop_transfer: function to stop data transfer which depends on MCI
 273  * capabilities.
 274  *
 275  * Locking
 276  * =======
 277  *
 278  * @lock is a softirq-safe spinlock protecting @queue as well as
 279  * @cur_slot, @mrq and @state. These must always be updated
 280  * at the same time while holding @lock.
 281  *
 282  * @lock also protects mode_reg and need_clock_update since these are
 283  * used to synchronize mode register updates with the queue
 284  * processing.
 285  *
 286  * The @mrq field of struct atmel_mci_slot is also protected by @lock,
 287  * and must always be written at the same time as the slot is added to
 288  * @queue.
 289  *
 290  * @pending_events and @completed_events are accessed using atomic bit
 291  * operations, so they don't need any locking.
 292  *
 293  * None of the fields touched by the interrupt handler need any
 294  * locking. However, ordering is important: Before EVENT_DATA_ERROR or
 295  * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
 296  * interrupts must be disabled and @data_status updated with a
 297  * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
 298  * CMDRDY interrupt must be disabled and @cmd_status updated with a
 299  * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
 300  * bytes_xfered field of @data must be written. This is ensured by
 301  * using barriers.
 302  */
 303 struct atmel_mci {
 304         spinlock_t              lock;
 305         void __iomem            *regs;
 306 
 307         struct scatterlist      *sg;
 308         unsigned int            sg_len;
 309         unsigned int            pio_offset;
 310         unsigned int            *buffer;
 311         unsigned int            buf_size;
 312         dma_addr_t              buf_phys_addr;
 313 
 314         struct atmel_mci_slot   *cur_slot;
 315         struct mmc_request      *mrq;
 316         struct mmc_command      *cmd;
 317         struct mmc_data         *data;
 318         unsigned int            data_size;
 319 
 320         struct atmel_mci_dma    dma;
 321         struct dma_chan         *data_chan;
 322         struct dma_slave_config dma_conf;
 323 
 324         u32                     cmd_status;
 325         u32                     data_status;
 326         u32                     stop_cmdr;
 327 
 328         struct tasklet_struct   tasklet;
 329         unsigned long           pending_events;
 330         unsigned long           completed_events;
 331         enum atmel_mci_state    state;
 332         struct list_head        queue;
 333 
 334         bool                    need_clock_update;
 335         bool                    need_reset;
 336         struct timer_list       timer;
 337         u32                     mode_reg;
 338         u32                     cfg_reg;
 339         unsigned long           bus_hz;
 340         unsigned long           mapbase;
 341         struct clk              *mck;
 342         struct platform_device  *pdev;
 343 
 344         struct atmel_mci_slot   *slot[ATMCI_MAX_NR_SLOTS];
 345 
 346         struct atmel_mci_caps   caps;
 347 
 348         u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
 349         void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
 350         void (*stop_transfer)(struct atmel_mci *host);
 351 };
 352 
 353 /**
 354  * struct atmel_mci_slot - MMC slot state
 355  * @mmc: The mmc_host representing this slot.
 356  * @host: The MMC controller this slot is using.
 357  * @sdc_reg: Value of SDCR to be written before using this slot.
 358  * @sdio_irq: SDIO irq mask for this slot.
 359  * @mrq: mmc_request currently being processed or waiting to be
 360  *      processed, or NULL when the slot is idle.
 361  * @queue_node: List node for placing this node in the @queue list of
 362  *      &struct atmel_mci.
 363  * @clock: Clock rate configured by set_ios(). Protected by host->lock.
 364  * @flags: Random state bits associated with the slot.
 365  * @detect_pin: GPIO pin used for card detection, or negative if not
 366  *      available.
 367  * @wp_pin: GPIO pin used for card write protect sending, or negative
 368  *      if not available.
 369  * @detect_is_active_high: The state of the detect pin when it is active.
 370  * @detect_timer: Timer used for debouncing @detect_pin interrupts.
 371  */
 372 struct atmel_mci_slot {
 373         struct mmc_host         *mmc;
 374         struct atmel_mci        *host;
 375 
 376         u32                     sdc_reg;
 377         u32                     sdio_irq;
 378 
 379         struct mmc_request      *mrq;
 380         struct list_head        queue_node;
 381 
 382         unsigned int            clock;
 383         unsigned long           flags;
 384 #define ATMCI_CARD_PRESENT      0
 385 #define ATMCI_CARD_NEED_INIT    1
 386 #define ATMCI_SHUTDOWN          2
 387 
 388         int                     detect_pin;
 389         int                     wp_pin;
 390         bool                    detect_is_active_high;
 391 
 392         struct timer_list       detect_timer;
 393 };
 394 
 395 #define atmci_test_and_clear_pending(host, event)               \
 396         test_and_clear_bit(event, &host->pending_events)
 397 #define atmci_set_completed(host, event)                        \
 398         set_bit(event, &host->completed_events)
 399 #define atmci_set_pending(host, event)                          \
 400         set_bit(event, &host->pending_events)
 401 
 402 /*
 403  * The debugfs stuff below is mostly optimized away when
 404  * CONFIG_DEBUG_FS is not set.
 405  */
 406 static int atmci_req_show(struct seq_file *s, void *v)
 407 {
 408         struct atmel_mci_slot   *slot = s->private;
 409         struct mmc_request      *mrq;
 410         struct mmc_command      *cmd;
 411         struct mmc_command      *stop;
 412         struct mmc_data         *data;
 413 
 414         /* Make sure we get a consistent snapshot */
 415         spin_lock_bh(&slot->host->lock);
 416         mrq = slot->mrq;
 417 
 418         if (mrq) {
 419                 cmd = mrq->cmd;
 420                 data = mrq->data;
 421                 stop = mrq->stop;
 422 
 423                 if (cmd)
 424                         seq_printf(s,
 425                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
 426                                 cmd->opcode, cmd->arg, cmd->flags,
 427                                 cmd->resp[0], cmd->resp[1], cmd->resp[2],
 428                                 cmd->resp[3], cmd->error);
 429                 if (data)
 430                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
 431                                 data->bytes_xfered, data->blocks,
 432                                 data->blksz, data->flags, data->error);
 433                 if (stop)
 434                         seq_printf(s,
 435                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
 436                                 stop->opcode, stop->arg, stop->flags,
 437                                 stop->resp[0], stop->resp[1], stop->resp[2],
 438                                 stop->resp[3], stop->error);
 439         }
 440 
 441         spin_unlock_bh(&slot->host->lock);
 442 
 443         return 0;
 444 }
 445 
 446 DEFINE_SHOW_ATTRIBUTE(atmci_req);
 447 
 448 static void atmci_show_status_reg(struct seq_file *s,
 449                 const char *regname, u32 value)
 450 {
 451         static const char       *sr_bit[] = {
 452                 [0]     = "CMDRDY",
 453                 [1]     = "RXRDY",
 454                 [2]     = "TXRDY",
 455                 [3]     = "BLKE",
 456                 [4]     = "DTIP",
 457                 [5]     = "NOTBUSY",
 458                 [6]     = "ENDRX",
 459                 [7]     = "ENDTX",
 460                 [8]     = "SDIOIRQA",
 461                 [9]     = "SDIOIRQB",
 462                 [12]    = "SDIOWAIT",
 463                 [14]    = "RXBUFF",
 464                 [15]    = "TXBUFE",
 465                 [16]    = "RINDE",
 466                 [17]    = "RDIRE",
 467                 [18]    = "RCRCE",
 468                 [19]    = "RENDE",
 469                 [20]    = "RTOE",
 470                 [21]    = "DCRCE",
 471                 [22]    = "DTOE",
 472                 [23]    = "CSTOE",
 473                 [24]    = "BLKOVRE",
 474                 [25]    = "DMADONE",
 475                 [26]    = "FIFOEMPTY",
 476                 [27]    = "XFRDONE",
 477                 [30]    = "OVRE",
 478                 [31]    = "UNRE",
 479         };
 480         unsigned int            i;
 481 
 482         seq_printf(s, "%s:\t0x%08x", regname, value);
 483         for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
 484                 if (value & (1 << i)) {
 485                         if (sr_bit[i])
 486                                 seq_printf(s, " %s", sr_bit[i]);
 487                         else
 488                                 seq_puts(s, " UNKNOWN");
 489                 }
 490         }
 491         seq_putc(s, '\n');
 492 }
 493 
 494 static int atmci_regs_show(struct seq_file *s, void *v)
 495 {
 496         struct atmel_mci        *host = s->private;
 497         u32                     *buf;
 498         int                     ret = 0;
 499 
 500 
 501         buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
 502         if (!buf)
 503                 return -ENOMEM;
 504 
 505         pm_runtime_get_sync(&host->pdev->dev);
 506 
 507         /*
 508          * Grab a more or less consistent snapshot. Note that we're
 509          * not disabling interrupts, so IMR and SR may not be
 510          * consistent.
 511          */
 512         spin_lock_bh(&host->lock);
 513         memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
 514         spin_unlock_bh(&host->lock);
 515 
 516         pm_runtime_mark_last_busy(&host->pdev->dev);
 517         pm_runtime_put_autosuspend(&host->pdev->dev);
 518 
 519         seq_printf(s, "MR:\t0x%08x%s%s ",
 520                         buf[ATMCI_MR / 4],
 521                         buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
 522                         buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "");
 523         if (host->caps.has_odd_clk_div)
 524                 seq_printf(s, "{CLKDIV,CLKODD}=%u\n",
 525                                 ((buf[ATMCI_MR / 4] & 0xff) << 1)
 526                                 | ((buf[ATMCI_MR / 4] >> 16) & 1));
 527         else
 528                 seq_printf(s, "CLKDIV=%u\n",
 529                                 (buf[ATMCI_MR / 4] & 0xff));
 530         seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
 531         seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
 532         seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
 533         seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
 534                         buf[ATMCI_BLKR / 4],
 535                         buf[ATMCI_BLKR / 4] & 0xffff,
 536                         (buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
 537         if (host->caps.has_cstor_reg)
 538                 seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
 539 
 540         /* Don't read RSPR and RDR; it will consume the data there */
 541 
 542         atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
 543         atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
 544 
 545         if (host->caps.has_dma_conf_reg) {
 546                 u32 val;
 547 
 548                 val = buf[ATMCI_DMA / 4];
 549                 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
 550                                 val, val & 3,
 551                                 ((val >> 4) & 3) ?
 552                                         1 << (((val >> 4) & 3) + 1) : 1,
 553                                 val & ATMCI_DMAEN ? " DMAEN" : "");
 554         }
 555         if (host->caps.has_cfg_reg) {
 556                 u32 val;
 557 
 558                 val = buf[ATMCI_CFG / 4];
 559                 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
 560                                 val,
 561                                 val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
 562                                 val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
 563                                 val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
 564                                 val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
 565         }
 566 
 567         kfree(buf);
 568 
 569         return ret;
 570 }
 571 
 572 DEFINE_SHOW_ATTRIBUTE(atmci_regs);
 573 
 574 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
 575 {
 576         struct mmc_host         *mmc = slot->mmc;
 577         struct atmel_mci        *host = slot->host;
 578         struct dentry           *root;
 579 
 580         root = mmc->debugfs_root;
 581         if (!root)
 582                 return;
 583 
 584         debugfs_create_file("regs", S_IRUSR, root, host, &atmci_regs_fops);
 585         debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
 586         debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
 587         debugfs_create_x32("pending_events", S_IRUSR, root,
 588                            (u32 *)&host->pending_events);
 589         debugfs_create_x32("completed_events", S_IRUSR, root,
 590                            (u32 *)&host->completed_events);
 591 }
 592 
 593 #if defined(CONFIG_OF)
 594 static const struct of_device_id atmci_dt_ids[] = {
 595         { .compatible = "atmel,hsmci" },
 596         { /* sentinel */ }
 597 };
 598 
 599 MODULE_DEVICE_TABLE(of, atmci_dt_ids);
 600 
 601 static struct mci_platform_data*
 602 atmci_of_init(struct platform_device *pdev)
 603 {
 604         struct device_node *np = pdev->dev.of_node;
 605         struct device_node *cnp;
 606         struct mci_platform_data *pdata;
 607         u32 slot_id;
 608 
 609         if (!np) {
 610                 dev_err(&pdev->dev, "device node not found\n");
 611                 return ERR_PTR(-EINVAL);
 612         }
 613 
 614         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 615         if (!pdata)
 616                 return ERR_PTR(-ENOMEM);
 617 
 618         for_each_child_of_node(np, cnp) {
 619                 if (of_property_read_u32(cnp, "reg", &slot_id)) {
 620                         dev_warn(&pdev->dev, "reg property is missing for %pOF\n",
 621                                  cnp);
 622                         continue;
 623                 }
 624 
 625                 if (slot_id >= ATMCI_MAX_NR_SLOTS) {
 626                         dev_warn(&pdev->dev, "can't have more than %d slots\n",
 627                                  ATMCI_MAX_NR_SLOTS);
 628                         of_node_put(cnp);
 629                         break;
 630                 }
 631 
 632                 if (of_property_read_u32(cnp, "bus-width",
 633                                          &pdata->slot[slot_id].bus_width))
 634                         pdata->slot[slot_id].bus_width = 1;
 635 
 636                 pdata->slot[slot_id].detect_pin =
 637                         of_get_named_gpio(cnp, "cd-gpios", 0);
 638 
 639                 pdata->slot[slot_id].detect_is_active_high =
 640                         of_property_read_bool(cnp, "cd-inverted");
 641 
 642                 pdata->slot[slot_id].non_removable =
 643                         of_property_read_bool(cnp, "non-removable");
 644 
 645                 pdata->slot[slot_id].wp_pin =
 646                         of_get_named_gpio(cnp, "wp-gpios", 0);
 647         }
 648 
 649         return pdata;
 650 }
 651 #else /* CONFIG_OF */
 652 static inline struct mci_platform_data*
 653 atmci_of_init(struct platform_device *dev)
 654 {
 655         return ERR_PTR(-EINVAL);
 656 }
 657 #endif
 658 
 659 static inline unsigned int atmci_get_version(struct atmel_mci *host)
 660 {
 661         return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
 662 }
 663 
 664 /*
 665  * Fix sconfig's burst size according to atmel MCI. We need to convert them as:
 666  * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
 667  * With version 0x600, we need to convert them as: 1 -> 0, 2 -> 1, 4 -> 2,
 668  * 8 -> 3, 16 -> 4.
 669  *
 670  * This can be done by finding most significant bit set.
 671  */
 672 static inline unsigned int atmci_convert_chksize(struct atmel_mci *host,
 673                                                  unsigned int maxburst)
 674 {
 675         unsigned int version = atmci_get_version(host);
 676         unsigned int offset = 2;
 677 
 678         if (version >= 0x600)
 679                 offset = 1;
 680 
 681         if (maxburst > 1)
 682                 return fls(maxburst) - offset;
 683         else
 684                 return 0;
 685 }
 686 
 687 static void atmci_timeout_timer(struct timer_list *t)
 688 {
 689         struct atmel_mci *host;
 690 
 691         host = from_timer(host, t, timer);
 692 
 693         dev_dbg(&host->pdev->dev, "software timeout\n");
 694 
 695         if (host->mrq->cmd->data) {
 696                 host->mrq->cmd->data->error = -ETIMEDOUT;
 697                 host->data = NULL;
 698                 /*
 699                  * With some SDIO modules, sometimes DMA transfer hangs. If
 700                  * stop_transfer() is not called then the DMA request is not
 701                  * removed, following ones are queued and never computed.
 702                  */
 703                 if (host->state == STATE_DATA_XFER)
 704                         host->stop_transfer(host);
 705         } else {
 706                 host->mrq->cmd->error = -ETIMEDOUT;
 707                 host->cmd = NULL;
 708         }
 709         host->need_reset = 1;
 710         host->state = STATE_END_REQUEST;
 711         smp_wmb();
 712         tasklet_schedule(&host->tasklet);
 713 }
 714 
 715 static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
 716                                         unsigned int ns)
 717 {
 718         /*
 719          * It is easier here to use us instead of ns for the timeout,
 720          * it prevents from overflows during calculation.
 721          */
 722         unsigned int us = DIV_ROUND_UP(ns, 1000);
 723 
 724         /* Maximum clock frequency is host->bus_hz/2 */
 725         return us * (DIV_ROUND_UP(host->bus_hz, 2000000));
 726 }
 727 
 728 static void atmci_set_timeout(struct atmel_mci *host,
 729                 struct atmel_mci_slot *slot, struct mmc_data *data)
 730 {
 731         static unsigned dtomul_to_shift[] = {
 732                 0, 4, 7, 8, 10, 12, 16, 20
 733         };
 734         unsigned        timeout;
 735         unsigned        dtocyc;
 736         unsigned        dtomul;
 737 
 738         timeout = atmci_ns_to_clocks(host, data->timeout_ns)
 739                 + data->timeout_clks;
 740 
 741         for (dtomul = 0; dtomul < 8; dtomul++) {
 742                 unsigned shift = dtomul_to_shift[dtomul];
 743                 dtocyc = (timeout + (1 << shift) - 1) >> shift;
 744                 if (dtocyc < 15)
 745                         break;
 746         }
 747 
 748         if (dtomul >= 8) {
 749                 dtomul = 7;
 750                 dtocyc = 15;
 751         }
 752 
 753         dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
 754                         dtocyc << dtomul_to_shift[dtomul]);
 755         atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
 756 }
 757 
 758 /*
 759  * Return mask with command flags to be enabled for this command.
 760  */
 761 static u32 atmci_prepare_command(struct mmc_host *mmc,
 762                                  struct mmc_command *cmd)
 763 {
 764         struct mmc_data *data;
 765         u32             cmdr;
 766 
 767         cmd->error = -EINPROGRESS;
 768 
 769         cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
 770 
 771         if (cmd->flags & MMC_RSP_PRESENT) {
 772                 if (cmd->flags & MMC_RSP_136)
 773                         cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
 774                 else
 775                         cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
 776         }
 777 
 778         /*
 779          * This should really be MAXLAT_5 for CMD2 and ACMD41, but
 780          * it's too difficult to determine whether this is an ACMD or
 781          * not. Better make it 64.
 782          */
 783         cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
 784 
 785         if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
 786                 cmdr |= ATMCI_CMDR_OPDCMD;
 787 
 788         data = cmd->data;
 789         if (data) {
 790                 cmdr |= ATMCI_CMDR_START_XFER;
 791 
 792                 if (cmd->opcode == SD_IO_RW_EXTENDED) {
 793                         cmdr |= ATMCI_CMDR_SDIO_BLOCK;
 794                 } else {
 795                         if (data->blocks > 1)
 796                                 cmdr |= ATMCI_CMDR_MULTI_BLOCK;
 797                         else
 798                                 cmdr |= ATMCI_CMDR_BLOCK;
 799                 }
 800 
 801                 if (data->flags & MMC_DATA_READ)
 802                         cmdr |= ATMCI_CMDR_TRDIR_READ;
 803         }
 804 
 805         return cmdr;
 806 }
 807 
 808 static void atmci_send_command(struct atmel_mci *host,
 809                 struct mmc_command *cmd, u32 cmd_flags)
 810 {
 811         WARN_ON(host->cmd);
 812         host->cmd = cmd;
 813 
 814         dev_vdbg(&host->pdev->dev,
 815                         "start command: ARGR=0x%08x CMDR=0x%08x\n",
 816                         cmd->arg, cmd_flags);
 817 
 818         atmci_writel(host, ATMCI_ARGR, cmd->arg);
 819         atmci_writel(host, ATMCI_CMDR, cmd_flags);
 820 }
 821 
 822 static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
 823 {
 824         dev_dbg(&host->pdev->dev, "send stop command\n");
 825         atmci_send_command(host, data->stop, host->stop_cmdr);
 826         atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
 827 }
 828 
 829 /*
 830  * Configure given PDC buffer taking care of alignement issues.
 831  * Update host->data_size and host->sg.
 832  */
 833 static void atmci_pdc_set_single_buf(struct atmel_mci *host,
 834         enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
 835 {
 836         u32 pointer_reg, counter_reg;
 837         unsigned int buf_size;
 838 
 839         if (dir == XFER_RECEIVE) {
 840                 pointer_reg = ATMEL_PDC_RPR;
 841                 counter_reg = ATMEL_PDC_RCR;
 842         } else {
 843                 pointer_reg = ATMEL_PDC_TPR;
 844                 counter_reg = ATMEL_PDC_TCR;
 845         }
 846 
 847         if (buf_nb == PDC_SECOND_BUF) {
 848                 pointer_reg += ATMEL_PDC_SCND_BUF_OFF;
 849                 counter_reg += ATMEL_PDC_SCND_BUF_OFF;
 850         }
 851 
 852         if (!host->caps.has_rwproof) {
 853                 buf_size = host->buf_size;
 854                 atmci_writel(host, pointer_reg, host->buf_phys_addr);
 855         } else {
 856                 buf_size = sg_dma_len(host->sg);
 857                 atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
 858         }
 859 
 860         if (host->data_size <= buf_size) {
 861                 if (host->data_size & 0x3) {
 862                         /* If size is different from modulo 4, transfer bytes */
 863                         atmci_writel(host, counter_reg, host->data_size);
 864                         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
 865                 } else {
 866                         /* Else transfer 32-bits words */
 867                         atmci_writel(host, counter_reg, host->data_size / 4);
 868                 }
 869                 host->data_size = 0;
 870         } else {
 871                 /* We assume the size of a page is 32-bits aligned */
 872                 atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4);
 873                 host->data_size -= sg_dma_len(host->sg);
 874                 if (host->data_size)
 875                         host->sg = sg_next(host->sg);
 876         }
 877 }
 878 
 879 /*
 880  * Configure PDC buffer according to the data size ie configuring one or two
 881  * buffers. Don't use this function if you want to configure only the second
 882  * buffer. In this case, use atmci_pdc_set_single_buf.
 883  */
 884 static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
 885 {
 886         atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
 887         if (host->data_size)
 888                 atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
 889 }
 890 
 891 /*
 892  * Unmap sg lists, called when transfer is finished.
 893  */
 894 static void atmci_pdc_cleanup(struct atmel_mci *host)
 895 {
 896         struct mmc_data         *data = host->data;
 897 
 898         if (data)
 899                 dma_unmap_sg(&host->pdev->dev,
 900                                 data->sg, data->sg_len,
 901                                 mmc_get_dma_dir(data));
 902 }
 903 
 904 /*
 905  * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
 906  * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
 907  * interrupt needed for both transfer directions.
 908  */
 909 static void atmci_pdc_complete(struct atmel_mci *host)
 910 {
 911         int transfer_size = host->data->blocks * host->data->blksz;
 912         int i;
 913 
 914         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
 915 
 916         if ((!host->caps.has_rwproof)
 917             && (host->data->flags & MMC_DATA_READ)) {
 918                 if (host->caps.has_bad_data_ordering)
 919                         for (i = 0; i < transfer_size; i++)
 920                                 host->buffer[i] = swab32(host->buffer[i]);
 921                 sg_copy_from_buffer(host->data->sg, host->data->sg_len,
 922                                     host->buffer, transfer_size);
 923         }
 924 
 925         atmci_pdc_cleanup(host);
 926 
 927         dev_dbg(&host->pdev->dev, "(%s) set pending xfer complete\n", __func__);
 928         atmci_set_pending(host, EVENT_XFER_COMPLETE);
 929         tasklet_schedule(&host->tasklet);
 930 }
 931 
 932 static void atmci_dma_cleanup(struct atmel_mci *host)
 933 {
 934         struct mmc_data                 *data = host->data;
 935 
 936         if (data)
 937                 dma_unmap_sg(host->dma.chan->device->dev,
 938                                 data->sg, data->sg_len,
 939                                 mmc_get_dma_dir(data));
 940 }
 941 
 942 /*
 943  * This function is called by the DMA driver from tasklet context.
 944  */
 945 static void atmci_dma_complete(void *arg)
 946 {
 947         struct atmel_mci        *host = arg;
 948         struct mmc_data         *data = host->data;
 949 
 950         dev_vdbg(&host->pdev->dev, "DMA complete\n");
 951 
 952         if (host->caps.has_dma_conf_reg)
 953                 /* Disable DMA hardware handshaking on MCI */
 954                 atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
 955 
 956         atmci_dma_cleanup(host);
 957 
 958         /*
 959          * If the card was removed, data will be NULL. No point trying
 960          * to send the stop command or waiting for NBUSY in this case.
 961          */
 962         if (data) {
 963                 dev_dbg(&host->pdev->dev,
 964                         "(%s) set pending xfer complete\n", __func__);
 965                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
 966                 tasklet_schedule(&host->tasklet);
 967 
 968                 /*
 969                  * Regardless of what the documentation says, we have
 970                  * to wait for NOTBUSY even after block read
 971                  * operations.
 972                  *
 973                  * When the DMA transfer is complete, the controller
 974                  * may still be reading the CRC from the card, i.e.
 975                  * the data transfer is still in progress and we
 976                  * haven't seen all the potential error bits yet.
 977                  *
 978                  * The interrupt handler will schedule a different
 979                  * tasklet to finish things up when the data transfer
 980                  * is completely done.
 981                  *
 982                  * We may not complete the mmc request here anyway
 983                  * because the mmc layer may call back and cause us to
 984                  * violate the "don't submit new operations from the
 985                  * completion callback" rule of the dma engine
 986                  * framework.
 987                  */
 988                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
 989         }
 990 }
 991 
 992 /*
 993  * Returns a mask of interrupt flags to be enabled after the whole
 994  * request has been prepared.
 995  */
 996 static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
 997 {
 998         u32 iflags;
 999 
1000         data->error = -EINPROGRESS;
1001 
1002         host->sg = data->sg;
1003         host->sg_len = data->sg_len;
1004         host->data = data;
1005         host->data_chan = NULL;
1006 
1007         iflags = ATMCI_DATA_ERROR_FLAGS;
1008 
1009         /*
1010          * Errata: MMC data write operation with less than 12
1011          * bytes is impossible.
1012          *
1013          * Errata: MCI Transmit Data Register (TDR) FIFO
1014          * corruption when length is not multiple of 4.
1015          */
1016         if (data->blocks * data->blksz < 12
1017                         || (data->blocks * data->blksz) & 3)
1018                 host->need_reset = true;
1019 
1020         host->pio_offset = 0;
1021         if (data->flags & MMC_DATA_READ)
1022                 iflags |= ATMCI_RXRDY;
1023         else
1024                 iflags |= ATMCI_TXRDY;
1025 
1026         return iflags;
1027 }
1028 
1029 /*
1030  * Set interrupt flags and set block length into the MCI mode register even
1031  * if this value is also accessible in the MCI block register. It seems to be
1032  * necessary before the High Speed MCI version. It also map sg and configure
1033  * PDC registers.
1034  */
1035 static u32
1036 atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
1037 {
1038         u32 iflags, tmp;
1039         int i;
1040 
1041         data->error = -EINPROGRESS;
1042 
1043         host->data = data;
1044         host->sg = data->sg;
1045         iflags = ATMCI_DATA_ERROR_FLAGS;
1046 
1047         /* Enable pdc mode */
1048         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
1049 
1050         if (data->flags & MMC_DATA_READ)
1051                 iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
1052         else
1053                 iflags |= ATMCI_ENDTX | ATMCI_TXBUFE | ATMCI_BLKE;
1054 
1055         /* Set BLKLEN */
1056         tmp = atmci_readl(host, ATMCI_MR);
1057         tmp &= 0x0000ffff;
1058         tmp |= ATMCI_BLKLEN(data->blksz);
1059         atmci_writel(host, ATMCI_MR, tmp);
1060 
1061         /* Configure PDC */
1062         host->data_size = data->blocks * data->blksz;
1063         dma_map_sg(&host->pdev->dev, data->sg, data->sg_len,
1064                    mmc_get_dma_dir(data));
1065 
1066         if ((!host->caps.has_rwproof)
1067             && (host->data->flags & MMC_DATA_WRITE)) {
1068                 sg_copy_to_buffer(host->data->sg, host->data->sg_len,
1069                                   host->buffer, host->data_size);
1070                 if (host->caps.has_bad_data_ordering)
1071                         for (i = 0; i < host->data_size; i++)
1072                                 host->buffer[i] = swab32(host->buffer[i]);
1073         }
1074 
1075         if (host->data_size)
1076                 atmci_pdc_set_both_buf(host, data->flags & MMC_DATA_READ ?
1077                                        XFER_RECEIVE : XFER_TRANSMIT);
1078         return iflags;
1079 }
1080 
1081 static u32
1082 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
1083 {
1084         struct dma_chan                 *chan;
1085         struct dma_async_tx_descriptor  *desc;
1086         struct scatterlist              *sg;
1087         unsigned int                    i;
1088         enum dma_transfer_direction     slave_dirn;
1089         unsigned int                    sglen;
1090         u32                             maxburst;
1091         u32 iflags;
1092 
1093         data->error = -EINPROGRESS;
1094 
1095         WARN_ON(host->data);
1096         host->sg = NULL;
1097         host->data = data;
1098 
1099         iflags = ATMCI_DATA_ERROR_FLAGS;
1100 
1101         /*
1102          * We don't do DMA on "complex" transfers, i.e. with
1103          * non-word-aligned buffers or lengths. Also, we don't bother
1104          * with all the DMA setup overhead for short transfers.
1105          */
1106         if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
1107                 return atmci_prepare_data(host, data);
1108         if (data->blksz & 3)
1109                 return atmci_prepare_data(host, data);
1110 
1111         for_each_sg(data->sg, sg, data->sg_len, i) {
1112                 if (sg->offset & 3 || sg->length & 3)
1113                         return atmci_prepare_data(host, data);
1114         }
1115 
1116         /* If we don't have a channel, we can't do DMA */
1117         chan = host->dma.chan;
1118         if (chan)
1119                 host->data_chan = chan;
1120 
1121         if (!chan)
1122                 return -ENODEV;
1123 
1124         if (data->flags & MMC_DATA_READ) {
1125                 host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
1126                 maxburst = atmci_convert_chksize(host,
1127                                                  host->dma_conf.src_maxburst);
1128         } else {
1129                 host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
1130                 maxburst = atmci_convert_chksize(host,
1131                                                  host->dma_conf.dst_maxburst);
1132         }
1133 
1134         if (host->caps.has_dma_conf_reg)
1135                 atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(maxburst) |
1136                         ATMCI_DMAEN);
1137 
1138         sglen = dma_map_sg(chan->device->dev, data->sg,
1139                         data->sg_len, mmc_get_dma_dir(data));
1140 
1141         dmaengine_slave_config(chan, &host->dma_conf);
1142         desc = dmaengine_prep_slave_sg(chan,
1143                         data->sg, sglen, slave_dirn,
1144                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1145         if (!desc)
1146                 goto unmap_exit;
1147 
1148         host->dma.data_desc = desc;
1149         desc->callback = atmci_dma_complete;
1150         desc->callback_param = host;
1151 
1152         return iflags;
1153 unmap_exit:
1154         dma_unmap_sg(chan->device->dev, data->sg, data->sg_len,
1155                      mmc_get_dma_dir(data));
1156         return -ENOMEM;
1157 }
1158 
1159 static void
1160 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
1161 {
1162         return;
1163 }
1164 
1165 /*
1166  * Start PDC according to transfer direction.
1167  */
1168 static void
1169 atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
1170 {
1171         if (data->flags & MMC_DATA_READ)
1172                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
1173         else
1174                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
1175 }
1176 
1177 static void
1178 atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
1179 {
1180         struct dma_chan                 *chan = host->data_chan;
1181         struct dma_async_tx_descriptor  *desc = host->dma.data_desc;
1182 
1183         if (chan) {
1184                 dmaengine_submit(desc);
1185                 dma_async_issue_pending(chan);
1186         }
1187 }
1188 
1189 static void atmci_stop_transfer(struct atmel_mci *host)
1190 {
1191         dev_dbg(&host->pdev->dev,
1192                 "(%s) set pending xfer complete\n", __func__);
1193         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1194         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1195 }
1196 
1197 /*
1198  * Stop data transfer because error(s) occurred.
1199  */
1200 static void atmci_stop_transfer_pdc(struct atmel_mci *host)
1201 {
1202         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
1203 }
1204 
1205 static void atmci_stop_transfer_dma(struct atmel_mci *host)
1206 {
1207         struct dma_chan *chan = host->data_chan;
1208 
1209         if (chan) {
1210                 dmaengine_terminate_all(chan);
1211                 atmci_dma_cleanup(host);
1212         } else {
1213                 /* Data transfer was stopped by the interrupt handler */
1214                 dev_dbg(&host->pdev->dev,
1215                         "(%s) set pending xfer complete\n", __func__);
1216                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1217                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1218         }
1219 }
1220 
1221 /*
1222  * Start a request: prepare data if needed, prepare the command and activate
1223  * interrupts.
1224  */
1225 static void atmci_start_request(struct atmel_mci *host,
1226                 struct atmel_mci_slot *slot)
1227 {
1228         struct mmc_request      *mrq;
1229         struct mmc_command      *cmd;
1230         struct mmc_data         *data;
1231         u32                     iflags;
1232         u32                     cmdflags;
1233 
1234         mrq = slot->mrq;
1235         host->cur_slot = slot;
1236         host->mrq = mrq;
1237 
1238         host->pending_events = 0;
1239         host->completed_events = 0;
1240         host->cmd_status = 0;
1241         host->data_status = 0;
1242 
1243         dev_dbg(&host->pdev->dev, "start request: cmd %u\n", mrq->cmd->opcode);
1244 
1245         if (host->need_reset || host->caps.need_reset_after_xfer) {
1246                 iflags = atmci_readl(host, ATMCI_IMR);
1247                 iflags &= (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB);
1248                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1249                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1250                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1251                 if (host->caps.has_cfg_reg)
1252                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1253                 atmci_writel(host, ATMCI_IER, iflags);
1254                 host->need_reset = false;
1255         }
1256         atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);
1257 
1258         iflags = atmci_readl(host, ATMCI_IMR);
1259         if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
1260                 dev_dbg(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
1261                                 iflags);
1262 
1263         if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
1264                 /* Send init sequence (74 clock cycles) */
1265                 atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT);
1266                 while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY))
1267                         cpu_relax();
1268         }
1269         iflags = 0;
1270         data = mrq->data;
1271         if (data) {
1272                 atmci_set_timeout(host, slot, data);
1273 
1274                 /* Must set block count/size before sending command */
1275                 atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks)
1276                                 | ATMCI_BLKLEN(data->blksz));
1277                 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
1278                         ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
1279 
1280                 iflags |= host->prepare_data(host, data);
1281         }
1282 
1283         iflags |= ATMCI_CMDRDY;
1284         cmd = mrq->cmd;
1285         cmdflags = atmci_prepare_command(slot->mmc, cmd);
1286 
1287         /*
1288          * DMA transfer should be started before sending the command to avoid
1289          * unexpected errors especially for read operations in SDIO mode.
1290          * Unfortunately, in PDC mode, command has to be sent before starting
1291          * the transfer.
1292          */
1293         if (host->submit_data != &atmci_submit_data_dma)
1294                 atmci_send_command(host, cmd, cmdflags);
1295 
1296         if (data)
1297                 host->submit_data(host, data);
1298 
1299         if (host->submit_data == &atmci_submit_data_dma)
1300                 atmci_send_command(host, cmd, cmdflags);
1301 
1302         if (mrq->stop) {
1303                 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
1304                 host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
1305                 if (!(data->flags & MMC_DATA_WRITE))
1306                         host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
1307                 host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
1308         }
1309 
1310         /*
1311          * We could have enabled interrupts earlier, but I suspect
1312          * that would open up a nice can of interesting race
1313          * conditions (e.g. command and data complete, but stop not
1314          * prepared yet.)
1315          */
1316         atmci_writel(host, ATMCI_IER, iflags);
1317 
1318         mod_timer(&host->timer, jiffies +  msecs_to_jiffies(2000));
1319 }
1320 
1321 static void atmci_queue_request(struct atmel_mci *host,
1322                 struct atmel_mci_slot *slot, struct mmc_request *mrq)
1323 {
1324         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1325                         host->state);
1326 
1327         spin_lock_bh(&host->lock);
1328         slot->mrq = mrq;
1329         if (host->state == STATE_IDLE) {
1330                 host->state = STATE_SENDING_CMD;
1331                 atmci_start_request(host, slot);
1332         } else {
1333                 dev_dbg(&host->pdev->dev, "queue request\n");
1334                 list_add_tail(&slot->queue_node, &host->queue);
1335         }
1336         spin_unlock_bh(&host->lock);
1337 }
1338 
1339 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1340 {
1341         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1342         struct atmel_mci        *host = slot->host;
1343         struct mmc_data         *data;
1344 
1345         WARN_ON(slot->mrq);
1346         dev_dbg(&host->pdev->dev, "MRQ: cmd %u\n", mrq->cmd->opcode);
1347 
1348         /*
1349          * We may "know" the card is gone even though there's still an
1350          * electrical connection. If so, we really need to communicate
1351          * this to the MMC core since there won't be any more
1352          * interrupts as the card is completely removed. Otherwise,
1353          * the MMC core might believe the card is still there even
1354          * though the card was just removed very slowly.
1355          */
1356         if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
1357                 mrq->cmd->error = -ENOMEDIUM;
1358                 mmc_request_done(mmc, mrq);
1359                 return;
1360         }
1361 
1362         /* We don't support multiple blocks of weird lengths. */
1363         data = mrq->data;
1364         if (data && data->blocks > 1 && data->blksz & 3) {
1365                 mrq->cmd->error = -EINVAL;
1366                 mmc_request_done(mmc, mrq);
1367         }
1368 
1369         atmci_queue_request(host, slot, mrq);
1370 }
1371 
1372 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1373 {
1374         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1375         struct atmel_mci        *host = slot->host;
1376         unsigned int            i;
1377 
1378         slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
1379         switch (ios->bus_width) {
1380         case MMC_BUS_WIDTH_1:
1381                 slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
1382                 break;
1383         case MMC_BUS_WIDTH_4:
1384                 slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
1385                 break;
1386         case MMC_BUS_WIDTH_8:
1387                 slot->sdc_reg |= ATMCI_SDCBUS_8BIT;
1388                 break;
1389         }
1390 
1391         if (ios->clock) {
1392                 unsigned int clock_min = ~0U;
1393                 int clkdiv;
1394 
1395                 spin_lock_bh(&host->lock);
1396                 if (!host->mode_reg) {
1397                         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1398                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1399                         if (host->caps.has_cfg_reg)
1400                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1401                 }
1402 
1403                 /*
1404                  * Use mirror of ios->clock to prevent race with mmc
1405                  * core ios update when finding the minimum.
1406                  */
1407                 slot->clock = ios->clock;
1408                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1409                         if (host->slot[i] && host->slot[i]->clock
1410                                         && host->slot[i]->clock < clock_min)
1411                                 clock_min = host->slot[i]->clock;
1412                 }
1413 
1414                 /* Calculate clock divider */
1415                 if (host->caps.has_odd_clk_div) {
1416                         clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2;
1417                         if (clkdiv < 0) {
1418                                 dev_warn(&mmc->class_dev,
1419                                          "clock %u too fast; using %lu\n",
1420                                          clock_min, host->bus_hz / 2);
1421                                 clkdiv = 0;
1422                         } else if (clkdiv > 511) {
1423                                 dev_warn(&mmc->class_dev,
1424                                          "clock %u too slow; using %lu\n",
1425                                          clock_min, host->bus_hz / (511 + 2));
1426                                 clkdiv = 511;
1427                         }
1428                         host->mode_reg = ATMCI_MR_CLKDIV(clkdiv >> 1)
1429                                          | ATMCI_MR_CLKODD(clkdiv & 1);
1430                 } else {
1431                         clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
1432                         if (clkdiv > 255) {
1433                                 dev_warn(&mmc->class_dev,
1434                                          "clock %u too slow; using %lu\n",
1435                                          clock_min, host->bus_hz / (2 * 256));
1436                                 clkdiv = 255;
1437                         }
1438                         host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
1439                 }
1440 
1441                 /*
1442                  * WRPROOF and RDPROOF prevent overruns/underruns by
1443                  * stopping the clock when the FIFO is full/empty.
1444                  * This state is not expected to last for long.
1445                  */
1446                 if (host->caps.has_rwproof)
1447                         host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
1448 
1449                 if (host->caps.has_cfg_reg) {
1450                         /* setup High Speed mode in relation with card capacity */
1451                         if (ios->timing == MMC_TIMING_SD_HS)
1452                                 host->cfg_reg |= ATMCI_CFG_HSMODE;
1453                         else
1454                                 host->cfg_reg &= ~ATMCI_CFG_HSMODE;
1455                 }
1456 
1457                 if (list_empty(&host->queue)) {
1458                         atmci_writel(host, ATMCI_MR, host->mode_reg);
1459                         if (host->caps.has_cfg_reg)
1460                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1461                 } else {
1462                         host->need_clock_update = true;
1463                 }
1464 
1465                 spin_unlock_bh(&host->lock);
1466         } else {
1467                 bool any_slot_active = false;
1468 
1469                 spin_lock_bh(&host->lock);
1470                 slot->clock = 0;
1471                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1472                         if (host->slot[i] && host->slot[i]->clock) {
1473                                 any_slot_active = true;
1474                                 break;
1475                         }
1476                 }
1477                 if (!any_slot_active) {
1478                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
1479                         if (host->mode_reg) {
1480                                 atmci_readl(host, ATMCI_MR);
1481                         }
1482                         host->mode_reg = 0;
1483                 }
1484                 spin_unlock_bh(&host->lock);
1485         }
1486 
1487         switch (ios->power_mode) {
1488         case MMC_POWER_OFF:
1489                 if (!IS_ERR(mmc->supply.vmmc))
1490                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1491                 break;
1492         case MMC_POWER_UP:
1493                 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
1494                 if (!IS_ERR(mmc->supply.vmmc))
1495                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
1496                 break;
1497         default:
1498                 break;
1499         }
1500 }
1501 
1502 static int atmci_get_ro(struct mmc_host *mmc)
1503 {
1504         int                     read_only = -ENOSYS;
1505         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1506 
1507         if (gpio_is_valid(slot->wp_pin)) {
1508                 read_only = gpio_get_value(slot->wp_pin);
1509                 dev_dbg(&mmc->class_dev, "card is %s\n",
1510                                 read_only ? "read-only" : "read-write");
1511         }
1512 
1513         return read_only;
1514 }
1515 
1516 static int atmci_get_cd(struct mmc_host *mmc)
1517 {
1518         int                     present = -ENOSYS;
1519         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1520 
1521         if (gpio_is_valid(slot->detect_pin)) {
1522                 present = !(gpio_get_value(slot->detect_pin) ^
1523                             slot->detect_is_active_high);
1524                 dev_dbg(&mmc->class_dev, "card is %spresent\n",
1525                                 present ? "" : "not ");
1526         }
1527 
1528         return present;
1529 }
1530 
1531 static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1532 {
1533         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1534         struct atmel_mci        *host = slot->host;
1535 
1536         if (enable)
1537                 atmci_writel(host, ATMCI_IER, slot->sdio_irq);
1538         else
1539                 atmci_writel(host, ATMCI_IDR, slot->sdio_irq);
1540 }
1541 
1542 static const struct mmc_host_ops atmci_ops = {
1543         .request        = atmci_request,
1544         .set_ios        = atmci_set_ios,
1545         .get_ro         = atmci_get_ro,
1546         .get_cd         = atmci_get_cd,
1547         .enable_sdio_irq = atmci_enable_sdio_irq,
1548 };
1549 
1550 /* Called with host->lock held */
1551 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
1552         __releases(&host->lock)
1553         __acquires(&host->lock)
1554 {
1555         struct atmel_mci_slot   *slot = NULL;
1556         struct mmc_host         *prev_mmc = host->cur_slot->mmc;
1557 
1558         WARN_ON(host->cmd || host->data);
1559 
1560         /*
1561          * Update the MMC clock rate if necessary. This may be
1562          * necessary if set_ios() is called when a different slot is
1563          * busy transferring data.
1564          */
1565         if (host->need_clock_update) {
1566                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1567                 if (host->caps.has_cfg_reg)
1568                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1569         }
1570 
1571         host->cur_slot->mrq = NULL;
1572         host->mrq = NULL;
1573         if (!list_empty(&host->queue)) {
1574                 slot = list_entry(host->queue.next,
1575                                 struct atmel_mci_slot, queue_node);
1576                 list_del(&slot->queue_node);
1577                 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
1578                                 mmc_hostname(slot->mmc));
1579                 host->state = STATE_SENDING_CMD;
1580                 atmci_start_request(host, slot);
1581         } else {
1582                 dev_vdbg(&host->pdev->dev, "list empty\n");
1583                 host->state = STATE_IDLE;
1584         }
1585 
1586         del_timer(&host->timer);
1587 
1588         spin_unlock(&host->lock);
1589         mmc_request_done(prev_mmc, mrq);
1590         spin_lock(&host->lock);
1591 }
1592 
1593 static void atmci_command_complete(struct atmel_mci *host,
1594                         struct mmc_command *cmd)
1595 {
1596         u32             status = host->cmd_status;
1597 
1598         /* Read the response from the card (up to 16 bytes) */
1599         cmd->resp[0] = atmci_readl(host, ATMCI_RSPR);
1600         cmd->resp[1] = atmci_readl(host, ATMCI_RSPR);
1601         cmd->resp[2] = atmci_readl(host, ATMCI_RSPR);
1602         cmd->resp[3] = atmci_readl(host, ATMCI_RSPR);
1603 
1604         if (status & ATMCI_RTOE)
1605                 cmd->error = -ETIMEDOUT;
1606         else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
1607                 cmd->error = -EILSEQ;
1608         else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
1609                 cmd->error = -EIO;
1610         else if (host->mrq->data && (host->mrq->data->blksz & 3)) {
1611                 if (host->caps.need_blksz_mul_4) {
1612                         cmd->error = -EINVAL;
1613                         host->need_reset = 1;
1614                 }
1615         } else
1616                 cmd->error = 0;
1617 }
1618 
1619 static void atmci_detect_change(struct timer_list *t)
1620 {
1621         struct atmel_mci_slot   *slot = from_timer(slot, t, detect_timer);
1622         bool                    present;
1623         bool                    present_old;
1624 
1625         /*
1626          * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
1627          * freeing the interrupt. We must not re-enable the interrupt
1628          * if it has been freed, and if we're shutting down, it
1629          * doesn't really matter whether the card is present or not.
1630          */
1631         smp_rmb();
1632         if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
1633                 return;
1634 
1635         enable_irq(gpio_to_irq(slot->detect_pin));
1636         present = !(gpio_get_value(slot->detect_pin) ^
1637                     slot->detect_is_active_high);
1638         present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
1639 
1640         dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
1641                         present, present_old);
1642 
1643         if (present != present_old) {
1644                 struct atmel_mci        *host = slot->host;
1645                 struct mmc_request      *mrq;
1646 
1647                 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1648                         present ? "inserted" : "removed");
1649 
1650                 spin_lock(&host->lock);
1651 
1652                 if (!present)
1653                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1654                 else
1655                         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1656 
1657                 /* Clean up queue if present */
1658                 mrq = slot->mrq;
1659                 if (mrq) {
1660                         if (mrq == host->mrq) {
1661                                 /*
1662                                  * Reset controller to terminate any ongoing
1663                                  * commands or data transfers.
1664                                  */
1665                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1666                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1667                                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1668                                 if (host->caps.has_cfg_reg)
1669                                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1670 
1671                                 host->data = NULL;
1672                                 host->cmd = NULL;
1673 
1674                                 switch (host->state) {
1675                                 case STATE_IDLE:
1676                                         break;
1677                                 case STATE_SENDING_CMD:
1678                                         mrq->cmd->error = -ENOMEDIUM;
1679                                         if (mrq->data)
1680                                                 host->stop_transfer(host);
1681                                         break;
1682                                 case STATE_DATA_XFER:
1683                                         mrq->data->error = -ENOMEDIUM;
1684                                         host->stop_transfer(host);
1685                                         break;
1686                                 case STATE_WAITING_NOTBUSY:
1687                                         mrq->data->error = -ENOMEDIUM;
1688                                         break;
1689                                 case STATE_SENDING_STOP:
1690                                         mrq->stop->error = -ENOMEDIUM;
1691                                         break;
1692                                 case STATE_END_REQUEST:
1693                                         break;
1694                                 }
1695 
1696                                 atmci_request_end(host, mrq);
1697                         } else {
1698                                 list_del(&slot->queue_node);
1699                                 mrq->cmd->error = -ENOMEDIUM;
1700                                 if (mrq->data)
1701                                         mrq->data->error = -ENOMEDIUM;
1702                                 if (mrq->stop)
1703                                         mrq->stop->error = -ENOMEDIUM;
1704 
1705                                 spin_unlock(&host->lock);
1706                                 mmc_request_done(slot->mmc, mrq);
1707                                 spin_lock(&host->lock);
1708                         }
1709                 }
1710                 spin_unlock(&host->lock);
1711 
1712                 mmc_detect_change(slot->mmc, 0);
1713         }
1714 }
1715 
1716 static void atmci_tasklet_func(unsigned long priv)
1717 {
1718         struct atmel_mci        *host = (struct atmel_mci *)priv;
1719         struct mmc_request      *mrq = host->mrq;
1720         struct mmc_data         *data = host->data;
1721         enum atmel_mci_state    state = host->state;
1722         enum atmel_mci_state    prev_state;
1723         u32                     status;
1724 
1725         spin_lock(&host->lock);
1726 
1727         state = host->state;
1728 
1729         dev_vdbg(&host->pdev->dev,
1730                 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
1731                 state, host->pending_events, host->completed_events,
1732                 atmci_readl(host, ATMCI_IMR));
1733 
1734         do {
1735                 prev_state = state;
1736                 dev_dbg(&host->pdev->dev, "FSM: state=%d\n", state);
1737 
1738                 switch (state) {
1739                 case STATE_IDLE:
1740                         break;
1741 
1742                 case STATE_SENDING_CMD:
1743                         /*
1744                          * Command has been sent, we are waiting for command
1745                          * ready. Then we have three next states possible:
1746                          * END_REQUEST by default, WAITING_NOTBUSY if it's a
1747                          * command needing it or DATA_XFER if there is data.
1748                          */
1749                         dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1750                         if (!atmci_test_and_clear_pending(host,
1751                                                 EVENT_CMD_RDY))
1752                                 break;
1753 
1754                         dev_dbg(&host->pdev->dev, "set completed cmd ready\n");
1755                         host->cmd = NULL;
1756                         atmci_set_completed(host, EVENT_CMD_RDY);
1757                         atmci_command_complete(host, mrq->cmd);
1758                         if (mrq->data) {
1759                                 dev_dbg(&host->pdev->dev,
1760                                         "command with data transfer");
1761                                 /*
1762                                  * If there is a command error don't start
1763                                  * data transfer.
1764                                  */
1765                                 if (mrq->cmd->error) {
1766                                         host->stop_transfer(host);
1767                                         host->data = NULL;
1768                                         atmci_writel(host, ATMCI_IDR,
1769                                                      ATMCI_TXRDY | ATMCI_RXRDY
1770                                                      | ATMCI_DATA_ERROR_FLAGS);
1771                                         state = STATE_END_REQUEST;
1772                                 } else
1773                                         state = STATE_DATA_XFER;
1774                         } else if ((!mrq->data) && (mrq->cmd->flags & MMC_RSP_BUSY)) {
1775                                 dev_dbg(&host->pdev->dev,
1776                                         "command response need waiting notbusy");
1777                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1778                                 state = STATE_WAITING_NOTBUSY;
1779                         } else
1780                                 state = STATE_END_REQUEST;
1781 
1782                         break;
1783 
1784                 case STATE_DATA_XFER:
1785                         if (atmci_test_and_clear_pending(host,
1786                                                 EVENT_DATA_ERROR)) {
1787                                 dev_dbg(&host->pdev->dev, "set completed data error\n");
1788                                 atmci_set_completed(host, EVENT_DATA_ERROR);
1789                                 state = STATE_END_REQUEST;
1790                                 break;
1791                         }
1792 
1793                         /*
1794                          * A data transfer is in progress. The event expected
1795                          * to move to the next state depends of data transfer
1796                          * type (PDC or DMA). Once transfer done we can move
1797                          * to the next step which is WAITING_NOTBUSY in write
1798                          * case and directly SENDING_STOP in read case.
1799                          */
1800                         dev_dbg(&host->pdev->dev, "FSM: xfer complete?\n");
1801                         if (!atmci_test_and_clear_pending(host,
1802                                                 EVENT_XFER_COMPLETE))
1803                                 break;
1804 
1805                         dev_dbg(&host->pdev->dev,
1806                                 "(%s) set completed xfer complete\n",
1807                                 __func__);
1808                         atmci_set_completed(host, EVENT_XFER_COMPLETE);
1809 
1810                         if (host->caps.need_notbusy_for_read_ops ||
1811                            (host->data->flags & MMC_DATA_WRITE)) {
1812                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1813                                 state = STATE_WAITING_NOTBUSY;
1814                         } else if (host->mrq->stop) {
1815                                 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
1816                                 atmci_send_stop_cmd(host, data);
1817                                 state = STATE_SENDING_STOP;
1818                         } else {
1819                                 host->data = NULL;
1820                                 data->bytes_xfered = data->blocks * data->blksz;
1821                                 data->error = 0;
1822                                 state = STATE_END_REQUEST;
1823                         }
1824                         break;
1825 
1826                 case STATE_WAITING_NOTBUSY:
1827                         /*
1828                          * We can be in the state for two reasons: a command
1829                          * requiring waiting not busy signal (stop command
1830                          * included) or a write operation. In the latest case,
1831                          * we need to send a stop command.
1832                          */
1833                         dev_dbg(&host->pdev->dev, "FSM: not busy?\n");
1834                         if (!atmci_test_and_clear_pending(host,
1835                                                 EVENT_NOTBUSY))
1836                                 break;
1837 
1838                         dev_dbg(&host->pdev->dev, "set completed not busy\n");
1839                         atmci_set_completed(host, EVENT_NOTBUSY);
1840 
1841                         if (host->data) {
1842                                 /*
1843                                  * For some commands such as CMD53, even if
1844                                  * there is data transfer, there is no stop
1845                                  * command to send.
1846                                  */
1847                                 if (host->mrq->stop) {
1848                                         atmci_writel(host, ATMCI_IER,
1849                                                      ATMCI_CMDRDY);
1850                                         atmci_send_stop_cmd(host, data);
1851                                         state = STATE_SENDING_STOP;
1852                                 } else {
1853                                         host->data = NULL;
1854                                         data->bytes_xfered = data->blocks
1855                                                              * data->blksz;
1856                                         data->error = 0;
1857                                         state = STATE_END_REQUEST;
1858                                 }
1859                         } else
1860                                 state = STATE_END_REQUEST;
1861                         break;
1862 
1863                 case STATE_SENDING_STOP:
1864                         /*
1865                          * In this state, it is important to set host->data to
1866                          * NULL (which is tested in the waiting notbusy state)
1867                          * in order to go to the end request state instead of
1868                          * sending stop again.
1869                          */
1870                         dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1871                         if (!atmci_test_and_clear_pending(host,
1872                                                 EVENT_CMD_RDY))
1873                                 break;
1874 
1875                         dev_dbg(&host->pdev->dev, "FSM: cmd ready\n");
1876                         host->cmd = NULL;
1877                         data->bytes_xfered = data->blocks * data->blksz;
1878                         data->error = 0;
1879                         atmci_command_complete(host, mrq->stop);
1880                         if (mrq->stop->error) {
1881                                 host->stop_transfer(host);
1882                                 atmci_writel(host, ATMCI_IDR,
1883                                              ATMCI_TXRDY | ATMCI_RXRDY
1884                                              | ATMCI_DATA_ERROR_FLAGS);
1885                                 state = STATE_END_REQUEST;
1886                         } else {
1887                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1888                                 state = STATE_WAITING_NOTBUSY;
1889                         }
1890                         host->data = NULL;
1891                         break;
1892 
1893                 case STATE_END_REQUEST:
1894                         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY | ATMCI_RXRDY
1895                                            | ATMCI_DATA_ERROR_FLAGS);
1896                         status = host->data_status;
1897                         if (unlikely(status)) {
1898                                 host->stop_transfer(host);
1899                                 host->data = NULL;
1900                                 if (data) {
1901                                         if (status & ATMCI_DTOE) {
1902                                                 data->error = -ETIMEDOUT;
1903                                         } else if (status & ATMCI_DCRCE) {
1904                                                 data->error = -EILSEQ;
1905                                         } else {
1906                                                 data->error = -EIO;
1907                                         }
1908                                 }
1909                         }
1910 
1911                         atmci_request_end(host, host->mrq);
1912                         goto unlock; /* atmci_request_end() sets host->state */
1913                         break;
1914                 }
1915         } while (state != prev_state);
1916 
1917         host->state = state;
1918 
1919 unlock:
1920         spin_unlock(&host->lock);
1921 }
1922 
1923 static void atmci_read_data_pio(struct atmel_mci *host)
1924 {
1925         struct scatterlist      *sg = host->sg;
1926         unsigned int            offset = host->pio_offset;
1927         struct mmc_data         *data = host->data;
1928         u32                     value;
1929         u32                     status;
1930         unsigned int            nbytes = 0;
1931 
1932         do {
1933                 value = atmci_readl(host, ATMCI_RDR);
1934                 if (likely(offset + 4 <= sg->length)) {
1935                         sg_pcopy_from_buffer(sg, 1, &value, sizeof(u32), offset);
1936 
1937                         offset += 4;
1938                         nbytes += 4;
1939 
1940                         if (offset == sg->length) {
1941                                 flush_dcache_page(sg_page(sg));
1942                                 host->sg = sg = sg_next(sg);
1943                                 host->sg_len--;
1944                                 if (!sg || !host->sg_len)
1945                                         goto done;
1946 
1947                                 offset = 0;
1948                         }
1949                 } else {
1950                         unsigned int remaining = sg->length - offset;
1951 
1952                         sg_pcopy_from_buffer(sg, 1, &value, remaining, offset);
1953                         nbytes += remaining;
1954 
1955                         flush_dcache_page(sg_page(sg));
1956                         host->sg = sg = sg_next(sg);
1957                         host->sg_len--;
1958                         if (!sg || !host->sg_len)
1959                                 goto done;
1960 
1961                         offset = 4 - remaining;
1962                         sg_pcopy_from_buffer(sg, 1, (u8 *)&value + remaining,
1963                                         offset, 0);
1964                         nbytes += offset;
1965                 }
1966 
1967                 status = atmci_readl(host, ATMCI_SR);
1968                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1969                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
1970                                                 | ATMCI_DATA_ERROR_FLAGS));
1971                         host->data_status = status;
1972                         data->bytes_xfered += nbytes;
1973                         return;
1974                 }
1975         } while (status & ATMCI_RXRDY);
1976 
1977         host->pio_offset = offset;
1978         data->bytes_xfered += nbytes;
1979 
1980         return;
1981 
1982 done:
1983         atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY);
1984         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1985         data->bytes_xfered += nbytes;
1986         smp_wmb();
1987         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1988 }
1989 
1990 static void atmci_write_data_pio(struct atmel_mci *host)
1991 {
1992         struct scatterlist      *sg = host->sg;
1993         unsigned int            offset = host->pio_offset;
1994         struct mmc_data         *data = host->data;
1995         u32                     value;
1996         u32                     status;
1997         unsigned int            nbytes = 0;
1998 
1999         do {
2000                 if (likely(offset + 4 <= sg->length)) {
2001                         sg_pcopy_to_buffer(sg, 1, &value, sizeof(u32), offset);
2002                         atmci_writel(host, ATMCI_TDR, value);
2003 
2004                         offset += 4;
2005                         nbytes += 4;
2006                         if (offset == sg->length) {
2007                                 host->sg = sg = sg_next(sg);
2008                                 host->sg_len--;
2009                                 if (!sg || !host->sg_len)
2010                                         goto done;
2011 
2012                                 offset = 0;
2013                         }
2014                 } else {
2015                         unsigned int remaining = sg->length - offset;
2016 
2017                         value = 0;
2018                         sg_pcopy_to_buffer(sg, 1, &value, remaining, offset);
2019                         nbytes += remaining;
2020 
2021                         host->sg = sg = sg_next(sg);
2022                         host->sg_len--;
2023                         if (!sg || !host->sg_len) {
2024                                 atmci_writel(host, ATMCI_TDR, value);
2025                                 goto done;
2026                         }
2027 
2028                         offset = 4 - remaining;
2029                         sg_pcopy_to_buffer(sg, 1, (u8 *)&value + remaining,
2030                                         offset, 0);
2031                         atmci_writel(host, ATMCI_TDR, value);
2032                         nbytes += offset;
2033                 }
2034 
2035                 status = atmci_readl(host, ATMCI_SR);
2036                 if (status & ATMCI_DATA_ERROR_FLAGS) {
2037                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
2038                                                 | ATMCI_DATA_ERROR_FLAGS));
2039                         host->data_status = status;
2040                         data->bytes_xfered += nbytes;
2041                         return;
2042                 }
2043         } while (status & ATMCI_TXRDY);
2044 
2045         host->pio_offset = offset;
2046         data->bytes_xfered += nbytes;
2047 
2048         return;
2049 
2050 done:
2051         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY);
2052         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
2053         data->bytes_xfered += nbytes;
2054         smp_wmb();
2055         atmci_set_pending(host, EVENT_XFER_COMPLETE);
2056 }
2057 
2058 static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
2059 {
2060         int     i;
2061 
2062         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2063                 struct atmel_mci_slot *slot = host->slot[i];
2064                 if (slot && (status & slot->sdio_irq)) {
2065                         mmc_signal_sdio_irq(slot->mmc);
2066                 }
2067         }
2068 }
2069 
2070 
2071 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
2072 {
2073         struct atmel_mci        *host = dev_id;
2074         u32                     status, mask, pending;
2075         unsigned int            pass_count = 0;
2076 
2077         do {
2078                 status = atmci_readl(host, ATMCI_SR);
2079                 mask = atmci_readl(host, ATMCI_IMR);
2080                 pending = status & mask;
2081                 if (!pending)
2082                         break;
2083 
2084                 if (pending & ATMCI_DATA_ERROR_FLAGS) {
2085                         dev_dbg(&host->pdev->dev, "IRQ: data error\n");
2086                         atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
2087                                         | ATMCI_RXRDY | ATMCI_TXRDY
2088                                         | ATMCI_ENDRX | ATMCI_ENDTX
2089                                         | ATMCI_RXBUFF | ATMCI_TXBUFE);
2090 
2091                         host->data_status = status;
2092                         dev_dbg(&host->pdev->dev, "set pending data error\n");
2093                         smp_wmb();
2094                         atmci_set_pending(host, EVENT_DATA_ERROR);
2095                         tasklet_schedule(&host->tasklet);
2096                 }
2097 
2098                 if (pending & ATMCI_TXBUFE) {
2099                         dev_dbg(&host->pdev->dev, "IRQ: tx buffer empty\n");
2100                         atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
2101                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2102                         /*
2103                          * We can receive this interruption before having configured
2104                          * the second pdc buffer, so we need to reconfigure first and
2105                          * second buffers again
2106                          */
2107                         if (host->data_size) {
2108                                 atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
2109                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2110                                 atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
2111                         } else {
2112                                 atmci_pdc_complete(host);
2113                         }
2114                 } else if (pending & ATMCI_ENDTX) {
2115                         dev_dbg(&host->pdev->dev, "IRQ: end of tx buffer\n");
2116                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2117 
2118                         if (host->data_size) {
2119                                 atmci_pdc_set_single_buf(host,
2120                                                 XFER_TRANSMIT, PDC_SECOND_BUF);
2121                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2122                         }
2123                 }
2124 
2125                 if (pending & ATMCI_RXBUFF) {
2126                         dev_dbg(&host->pdev->dev, "IRQ: rx buffer full\n");
2127                         atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
2128                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2129                         /*
2130                          * We can receive this interruption before having configured
2131                          * the second pdc buffer, so we need to reconfigure first and
2132                          * second buffers again
2133                          */
2134                         if (host->data_size) {
2135                                 atmci_pdc_set_both_buf(host, XFER_RECEIVE);
2136                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2137                                 atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
2138                         } else {
2139                                 atmci_pdc_complete(host);
2140                         }
2141                 } else if (pending & ATMCI_ENDRX) {
2142                         dev_dbg(&host->pdev->dev, "IRQ: end of rx buffer\n");
2143                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2144 
2145                         if (host->data_size) {
2146                                 atmci_pdc_set_single_buf(host,
2147                                                 XFER_RECEIVE, PDC_SECOND_BUF);
2148                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2149                         }
2150                 }
2151 
2152                 /*
2153                  * First mci IPs, so mainly the ones having pdc, have some
2154                  * issues with the notbusy signal. You can't get it after
2155                  * data transmission if you have not sent a stop command.
2156                  * The appropriate workaround is to use the BLKE signal.
2157                  */
2158                 if (pending & ATMCI_BLKE) {
2159                         dev_dbg(&host->pdev->dev, "IRQ: blke\n");
2160                         atmci_writel(host, ATMCI_IDR, ATMCI_BLKE);
2161                         smp_wmb();
2162                         dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2163                         atmci_set_pending(host, EVENT_NOTBUSY);
2164                         tasklet_schedule(&host->tasklet);
2165                 }
2166 
2167                 if (pending & ATMCI_NOTBUSY) {
2168                         dev_dbg(&host->pdev->dev, "IRQ: not_busy\n");
2169                         atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY);
2170                         smp_wmb();
2171                         dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2172                         atmci_set_pending(host, EVENT_NOTBUSY);
2173                         tasklet_schedule(&host->tasklet);
2174                 }
2175 
2176                 if (pending & ATMCI_RXRDY)
2177                         atmci_read_data_pio(host);
2178                 if (pending & ATMCI_TXRDY)
2179                         atmci_write_data_pio(host);
2180 
2181                 if (pending & ATMCI_CMDRDY) {
2182                         dev_dbg(&host->pdev->dev, "IRQ: cmd ready\n");
2183                         atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
2184                         host->cmd_status = status;
2185                         smp_wmb();
2186                         dev_dbg(&host->pdev->dev, "set pending cmd rdy\n");
2187                         atmci_set_pending(host, EVENT_CMD_RDY);
2188                         tasklet_schedule(&host->tasklet);
2189                 }
2190 
2191                 if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
2192                         atmci_sdio_interrupt(host, status);
2193 
2194         } while (pass_count++ < 5);
2195 
2196         return pass_count ? IRQ_HANDLED : IRQ_NONE;
2197 }
2198 
2199 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
2200 {
2201         struct atmel_mci_slot   *slot = dev_id;
2202 
2203         /*
2204          * Disable interrupts until the pin has stabilized and check
2205          * the state then. Use mod_timer() since we may be in the
2206          * middle of the timer routine when this interrupt triggers.
2207          */
2208         disable_irq_nosync(irq);
2209         mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
2210 
2211         return IRQ_HANDLED;
2212 }
2213 
2214 static int atmci_init_slot(struct atmel_mci *host,
2215                 struct mci_slot_pdata *slot_data, unsigned int id,
2216                 u32 sdc_reg, u32 sdio_irq)
2217 {
2218         struct mmc_host                 *mmc;
2219         struct atmel_mci_slot           *slot;
2220 
2221         mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
2222         if (!mmc)
2223                 return -ENOMEM;
2224 
2225         slot = mmc_priv(mmc);
2226         slot->mmc = mmc;
2227         slot->host = host;
2228         slot->detect_pin = slot_data->detect_pin;
2229         slot->wp_pin = slot_data->wp_pin;
2230         slot->detect_is_active_high = slot_data->detect_is_active_high;
2231         slot->sdc_reg = sdc_reg;
2232         slot->sdio_irq = sdio_irq;
2233 
2234         dev_dbg(&mmc->class_dev,
2235                 "slot[%u]: bus_width=%u, detect_pin=%d, "
2236                 "detect_is_active_high=%s, wp_pin=%d\n",
2237                 id, slot_data->bus_width, slot_data->detect_pin,
2238                 slot_data->detect_is_active_high ? "true" : "false",
2239                 slot_data->wp_pin);
2240 
2241         mmc->ops = &atmci_ops;
2242         mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
2243         mmc->f_max = host->bus_hz / 2;
2244         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
2245         if (sdio_irq)
2246                 mmc->caps |= MMC_CAP_SDIO_IRQ;
2247         if (host->caps.has_highspeed)
2248                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
2249         /*
2250          * Without the read/write proof capability, it is strongly suggested to
2251          * use only one bit for data to prevent fifo underruns and overruns
2252          * which will corrupt data.
2253          */
2254         if ((slot_data->bus_width >= 4) && host->caps.has_rwproof) {
2255                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2256                 if (slot_data->bus_width >= 8)
2257                         mmc->caps |= MMC_CAP_8_BIT_DATA;
2258         }
2259 
2260         if (atmci_get_version(host) < 0x200) {
2261                 mmc->max_segs = 256;
2262                 mmc->max_blk_size = 4095;
2263                 mmc->max_blk_count = 256;
2264                 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2265                 mmc->max_seg_size = mmc->max_blk_size * mmc->max_segs;
2266         } else {
2267                 mmc->max_segs = 64;
2268                 mmc->max_req_size = 32768 * 512;
2269                 mmc->max_blk_size = 32768;
2270                 mmc->max_blk_count = 512;
2271         }
2272 
2273         /* Assume card is present initially */
2274         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
2275         if (gpio_is_valid(slot->detect_pin)) {
2276                 if (devm_gpio_request(&host->pdev->dev, slot->detect_pin,
2277                                       "mmc_detect")) {
2278                         dev_dbg(&mmc->class_dev, "no detect pin available\n");
2279                         slot->detect_pin = -EBUSY;
2280                 } else if (gpio_get_value(slot->detect_pin) ^
2281                                 slot->detect_is_active_high) {
2282                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
2283                 }
2284         }
2285 
2286         if (!gpio_is_valid(slot->detect_pin)) {
2287                 if (slot_data->non_removable)
2288                         mmc->caps |= MMC_CAP_NONREMOVABLE;
2289                 else
2290                         mmc->caps |= MMC_CAP_NEEDS_POLL;
2291         }
2292 
2293         if (gpio_is_valid(slot->wp_pin)) {
2294                 if (devm_gpio_request(&host->pdev->dev, slot->wp_pin,
2295                                       "mmc_wp")) {
2296                         dev_dbg(&mmc->class_dev, "no WP pin available\n");
2297                         slot->wp_pin = -EBUSY;
2298                 }
2299         }
2300 
2301         host->slot[id] = slot;
2302         mmc_regulator_get_supply(mmc);
2303         mmc_add_host(mmc);
2304 
2305         if (gpio_is_valid(slot->detect_pin)) {
2306                 int ret;
2307 
2308                 timer_setup(&slot->detect_timer, atmci_detect_change, 0);
2309 
2310                 ret = request_irq(gpio_to_irq(slot->detect_pin),
2311                                 atmci_detect_interrupt,
2312                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
2313                                 "mmc-detect", slot);
2314                 if (ret) {
2315                         dev_dbg(&mmc->class_dev,
2316                                 "could not request IRQ %d for detect pin\n",
2317                                 gpio_to_irq(slot->detect_pin));
2318                         slot->detect_pin = -EBUSY;
2319                 }
2320         }
2321 
2322         atmci_init_debugfs(slot);
2323 
2324         return 0;
2325 }
2326 
2327 static void atmci_cleanup_slot(struct atmel_mci_slot *slot,
2328                 unsigned int id)
2329 {
2330         /* Debugfs stuff is cleaned up by mmc core */
2331 
2332         set_bit(ATMCI_SHUTDOWN, &slot->flags);
2333         smp_wmb();
2334 
2335         mmc_remove_host(slot->mmc);
2336 
2337         if (gpio_is_valid(slot->detect_pin)) {
2338                 int pin = slot->detect_pin;
2339 
2340                 free_irq(gpio_to_irq(pin), slot);
2341                 del_timer_sync(&slot->detect_timer);
2342         }
2343 
2344         slot->host->slot[id] = NULL;
2345         mmc_free_host(slot->mmc);
2346 }
2347 
2348 static int atmci_configure_dma(struct atmel_mci *host)
2349 {
2350         host->dma.chan = dma_request_slave_channel_reason(&host->pdev->dev,
2351                                                         "rxtx");
2352 
2353         if (PTR_ERR(host->dma.chan) == -ENODEV) {
2354                 struct mci_platform_data *pdata = host->pdev->dev.platform_data;
2355                 dma_cap_mask_t mask;
2356 
2357                 if (!pdata || !pdata->dma_filter)
2358                         return -ENODEV;
2359 
2360                 dma_cap_zero(mask);
2361                 dma_cap_set(DMA_SLAVE, mask);
2362 
2363                 host->dma.chan = dma_request_channel(mask, pdata->dma_filter,
2364                                                      pdata->dma_slave);
2365                 if (!host->dma.chan)
2366                         host->dma.chan = ERR_PTR(-ENODEV);
2367         }
2368 
2369         if (IS_ERR(host->dma.chan))
2370                 return PTR_ERR(host->dma.chan);
2371 
2372         dev_info(&host->pdev->dev, "using %s for DMA transfers\n",
2373                  dma_chan_name(host->dma.chan));
2374 
2375         host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
2376         host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2377         host->dma_conf.src_maxburst = 1;
2378         host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
2379         host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2380         host->dma_conf.dst_maxburst = 1;
2381         host->dma_conf.device_fc = false;
2382 
2383         return 0;
2384 }
2385 
2386 /*
2387  * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
2388  * HSMCI provides DMA support and a new config register but no more supports
2389  * PDC.
2390  */
2391 static void atmci_get_cap(struct atmel_mci *host)
2392 {
2393         unsigned int version;
2394 
2395         version = atmci_get_version(host);
2396         dev_info(&host->pdev->dev,
2397                         "version: 0x%x\n", version);
2398 
2399         host->caps.has_dma_conf_reg = 0;
2400         host->caps.has_pdc = 1;
2401         host->caps.has_cfg_reg = 0;
2402         host->caps.has_cstor_reg = 0;
2403         host->caps.has_highspeed = 0;
2404         host->caps.has_rwproof = 0;
2405         host->caps.has_odd_clk_div = 0;
2406         host->caps.has_bad_data_ordering = 1;
2407         host->caps.need_reset_after_xfer = 1;
2408         host->caps.need_blksz_mul_4 = 1;
2409         host->caps.need_notbusy_for_read_ops = 0;
2410 
2411         /* keep only major version number */
2412         switch (version & 0xf00) {
2413         case 0x600:
2414         case 0x500:
2415                 host->caps.has_odd_clk_div = 1;
2416                 /* Fall through */
2417         case 0x400:
2418         case 0x300:
2419                 host->caps.has_dma_conf_reg = 1;
2420                 host->caps.has_pdc = 0;
2421                 host->caps.has_cfg_reg = 1;
2422                 host->caps.has_cstor_reg = 1;
2423                 host->caps.has_highspeed = 1;
2424                 /* Fall through */
2425         case 0x200:
2426                 host->caps.has_rwproof = 1;
2427                 host->caps.need_blksz_mul_4 = 0;
2428                 host->caps.need_notbusy_for_read_ops = 1;
2429                 /* Fall through */
2430         case 0x100:
2431                 host->caps.has_bad_data_ordering = 0;
2432                 host->caps.need_reset_after_xfer = 0;
2433                 /* Fall through */
2434         case 0x0:
2435                 break;
2436         default:
2437                 host->caps.has_pdc = 0;
2438                 dev_warn(&host->pdev->dev,
2439                                 "Unmanaged mci version, set minimum capabilities\n");
2440                 break;
2441         }
2442 }
2443 
2444 static int atmci_probe(struct platform_device *pdev)
2445 {
2446         struct mci_platform_data        *pdata;
2447         struct atmel_mci                *host;
2448         struct resource                 *regs;
2449         unsigned int                    nr_slots;
2450         int                             irq;
2451         int                             ret, i;
2452 
2453         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2454         if (!regs)
2455                 return -ENXIO;
2456         pdata = pdev->dev.platform_data;
2457         if (!pdata) {
2458                 pdata = atmci_of_init(pdev);
2459                 if (IS_ERR(pdata)) {
2460                         dev_err(&pdev->dev, "platform data not available\n");
2461                         return PTR_ERR(pdata);
2462                 }
2463         }
2464 
2465         irq = platform_get_irq(pdev, 0);
2466         if (irq < 0)
2467                 return irq;
2468 
2469         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
2470         if (!host)
2471                 return -ENOMEM;
2472 
2473         host->pdev = pdev;
2474         spin_lock_init(&host->lock);
2475         INIT_LIST_HEAD(&host->queue);
2476 
2477         host->mck = devm_clk_get(&pdev->dev, "mci_clk");
2478         if (IS_ERR(host->mck))
2479                 return PTR_ERR(host->mck);
2480 
2481         host->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2482         if (!host->regs)
2483                 return -ENOMEM;
2484 
2485         ret = clk_prepare_enable(host->mck);
2486         if (ret)
2487                 return ret;
2488 
2489         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
2490         host->bus_hz = clk_get_rate(host->mck);
2491 
2492         host->mapbase = regs->start;
2493 
2494         tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
2495 
2496         ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
2497         if (ret) {
2498                 clk_disable_unprepare(host->mck);
2499                 return ret;
2500         }
2501 
2502         /* Get MCI capabilities and set operations according to it */
2503         atmci_get_cap(host);
2504         ret = atmci_configure_dma(host);
2505         if (ret == -EPROBE_DEFER)
2506                 goto err_dma_probe_defer;
2507         if (ret == 0) {
2508                 host->prepare_data = &atmci_prepare_data_dma;
2509                 host->submit_data = &atmci_submit_data_dma;
2510                 host->stop_transfer = &atmci_stop_transfer_dma;
2511         } else if (host->caps.has_pdc) {
2512                 dev_info(&pdev->dev, "using PDC\n");
2513                 host->prepare_data = &atmci_prepare_data_pdc;
2514                 host->submit_data = &atmci_submit_data_pdc;
2515                 host->stop_transfer = &atmci_stop_transfer_pdc;
2516         } else {
2517                 dev_info(&pdev->dev, "using PIO\n");
2518                 host->prepare_data = &atmci_prepare_data;
2519                 host->submit_data = &atmci_submit_data;
2520                 host->stop_transfer = &atmci_stop_transfer;
2521         }
2522 
2523         platform_set_drvdata(pdev, host);
2524 
2525         timer_setup(&host->timer, atmci_timeout_timer, 0);
2526 
2527         pm_runtime_get_noresume(&pdev->dev);
2528         pm_runtime_set_active(&pdev->dev);
2529         pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_DELAY);
2530         pm_runtime_use_autosuspend(&pdev->dev);
2531         pm_runtime_enable(&pdev->dev);
2532 
2533         /* We need at least one slot to succeed */
2534         nr_slots = 0;
2535         ret = -ENODEV;
2536         if (pdata->slot[0].bus_width) {
2537                 ret = atmci_init_slot(host, &pdata->slot[0],
2538                                 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
2539                 if (!ret) {
2540                         nr_slots++;
2541                         host->buf_size = host->slot[0]->mmc->max_req_size;
2542                 }
2543         }
2544         if (pdata->slot[1].bus_width) {
2545                 ret = atmci_init_slot(host, &pdata->slot[1],
2546                                 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
2547                 if (!ret) {
2548                         nr_slots++;
2549                         if (host->slot[1]->mmc->max_req_size > host->buf_size)
2550                                 host->buf_size =
2551                                         host->slot[1]->mmc->max_req_size;
2552                 }
2553         }
2554 
2555         if (!nr_slots) {
2556                 dev_err(&pdev->dev, "init failed: no slot defined\n");
2557                 goto err_init_slot;
2558         }
2559 
2560         if (!host->caps.has_rwproof) {
2561                 host->buffer = dma_alloc_coherent(&pdev->dev, host->buf_size,
2562                                                   &host->buf_phys_addr,
2563                                                   GFP_KERNEL);
2564                 if (!host->buffer) {
2565                         ret = -ENOMEM;
2566                         dev_err(&pdev->dev, "buffer allocation failed\n");
2567                         goto err_dma_alloc;
2568                 }
2569         }
2570 
2571         dev_info(&pdev->dev,
2572                         "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
2573                         host->mapbase, irq, nr_slots);
2574 
2575         pm_runtime_mark_last_busy(&host->pdev->dev);
2576         pm_runtime_put_autosuspend(&pdev->dev);
2577 
2578         return 0;
2579 
2580 err_dma_alloc:
2581         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2582                 if (host->slot[i])
2583                         atmci_cleanup_slot(host->slot[i], i);
2584         }
2585 err_init_slot:
2586         clk_disable_unprepare(host->mck);
2587 
2588         pm_runtime_disable(&pdev->dev);
2589         pm_runtime_put_noidle(&pdev->dev);
2590 
2591         del_timer_sync(&host->timer);
2592         if (!IS_ERR(host->dma.chan))
2593                 dma_release_channel(host->dma.chan);
2594 err_dma_probe_defer:
2595         free_irq(irq, host);
2596         return ret;
2597 }
2598 
2599 static int atmci_remove(struct platform_device *pdev)
2600 {
2601         struct atmel_mci        *host = platform_get_drvdata(pdev);
2602         unsigned int            i;
2603 
2604         pm_runtime_get_sync(&pdev->dev);
2605 
2606         if (host->buffer)
2607                 dma_free_coherent(&pdev->dev, host->buf_size,
2608                                   host->buffer, host->buf_phys_addr);
2609 
2610         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2611                 if (host->slot[i])
2612                         atmci_cleanup_slot(host->slot[i], i);
2613         }
2614 
2615         atmci_writel(host, ATMCI_IDR, ~0UL);
2616         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
2617         atmci_readl(host, ATMCI_SR);
2618 
2619         del_timer_sync(&host->timer);
2620         if (!IS_ERR(host->dma.chan))
2621                 dma_release_channel(host->dma.chan);
2622 
2623         free_irq(platform_get_irq(pdev, 0), host);
2624 
2625         clk_disable_unprepare(host->mck);
2626 
2627         pm_runtime_disable(&pdev->dev);
2628         pm_runtime_put_noidle(&pdev->dev);
2629 
2630         return 0;
2631 }
2632 
2633 #ifdef CONFIG_PM
2634 static int atmci_runtime_suspend(struct device *dev)
2635 {
2636         struct atmel_mci *host = dev_get_drvdata(dev);
2637 
2638         clk_disable_unprepare(host->mck);
2639 
2640         pinctrl_pm_select_sleep_state(dev);
2641 
2642         return 0;
2643 }
2644 
2645 static int atmci_runtime_resume(struct device *dev)
2646 {
2647         struct atmel_mci *host = dev_get_drvdata(dev);
2648 
2649         pinctrl_pm_select_default_state(dev);
2650 
2651         return clk_prepare_enable(host->mck);
2652 }
2653 #endif
2654 
2655 static const struct dev_pm_ops atmci_dev_pm_ops = {
2656         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
2657                                 pm_runtime_force_resume)
2658         SET_RUNTIME_PM_OPS(atmci_runtime_suspend, atmci_runtime_resume, NULL)
2659 };
2660 
2661 static struct platform_driver atmci_driver = {
2662         .probe          = atmci_probe,
2663         .remove         = atmci_remove,
2664         .driver         = {
2665                 .name           = "atmel_mci",
2666                 .of_match_table = of_match_ptr(atmci_dt_ids),
2667                 .pm             = &atmci_dev_pm_ops,
2668         },
2669 };
2670 module_platform_driver(atmci_driver);
2671 
2672 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
2673 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2674 MODULE_LICENSE("GPL v2");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/mmc/host/atmel-mci.c

DEFINITIONS
