drivers/mmc/host/sunxi-mmc.c

   1 /*
   2  * Driver for sunxi SD/MMC host controllers
   3  * (C) Copyright 2007-2011 Reuuimlla Technology Co., Ltd.
   4  * (C) Copyright 2007-2011 Aaron Maoye <leafy.myeh@reuuimllatech.com>
   5  * (C) Copyright 2013-2014 O2S GmbH <www.o2s.ch>
   6  * (C) Copyright 2013-2014 David Lanzend�rfer <david.lanzendoerfer@o2s.ch>
   7  * (C) Copyright 2013-2014 Hans de Goede <hdegoede@redhat.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/io.h>
  18 #include <linux/device.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/delay.h>
  21 #include <linux/err.h>
  22
  23 #include <linux/clk.h>
  24 #include <linux/gpio.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/scatterlist.h>
  28 #include <linux/dma-mapping.h>
  29 #include <linux/slab.h>
  30 #include <linux/reset.h>
  31 #include <linux/regulator/consumer.h>
  32
  33 #include <linux/of_address.h>
  34 #include <linux/of_gpio.h>
  35 #include <linux/of_platform.h>
  36
  37 #include <linux/mmc/host.h>
  38 #include <linux/mmc/sd.h>
  39 #include <linux/mmc/sdio.h>
  40 #include <linux/mmc/mmc.h>
  41 #include <linux/mmc/core.h>
  42 #include <linux/mmc/card.h>
  43 #include <linux/mmc/slot-gpio.h>
  44
  45 /* register offset definitions */
  46 #define SDXC_REG_GCTRL  (0x00) /* SMC Global Control Register */
  47 #define SDXC_REG_CLKCR  (0x04) /* SMC Clock Control Register */
  48 #define SDXC_REG_TMOUT  (0x08) /* SMC Time Out Register */
  49 #define SDXC_REG_WIDTH  (0x0C) /* SMC Bus Width Register */
  50 #define SDXC_REG_BLKSZ  (0x10) /* SMC Block Size Register */
  51 #define SDXC_REG_BCNTR  (0x14) /* SMC Byte Count Register */
  52 #define SDXC_REG_CMDR   (0x18) /* SMC Command Register */
  53 #define SDXC_REG_CARG   (0x1C) /* SMC Argument Register */
  54 #define SDXC_REG_RESP0  (0x20) /* SMC Response Register 0 */
  55 #define SDXC_REG_RESP1  (0x24) /* SMC Response Register 1 */
  56 #define SDXC_REG_RESP2  (0x28) /* SMC Response Register 2 */
  57 #define SDXC_REG_RESP3  (0x2C) /* SMC Response Register 3 */
  58 #define SDXC_REG_IMASK  (0x30) /* SMC Interrupt Mask Register */
  59 #define SDXC_REG_MISTA  (0x34) /* SMC Masked Interrupt Status Register */
  60 #define SDXC_REG_RINTR  (0x38) /* SMC Raw Interrupt Status Register */
  61 #define SDXC_REG_STAS   (0x3C) /* SMC Status Register */
  62 #define SDXC_REG_FTRGL  (0x40) /* SMC FIFO Threshold Watermark Registe */
  63 #define SDXC_REG_FUNS   (0x44) /* SMC Function Select Register */
  64 #define SDXC_REG_CBCR   (0x48) /* SMC CIU Byte Count Register */
  65 #define SDXC_REG_BBCR   (0x4C) /* SMC BIU Byte Count Register */
  66 #define SDXC_REG_DBGC   (0x50) /* SMC Debug Enable Register */
  67 #define SDXC_REG_HWRST  (0x78) /* SMC Card Hardware Reset for Register */
  68 #define SDXC_REG_DMAC   (0x80) /* SMC IDMAC Control Register */
  69 #define SDXC_REG_DLBA   (0x84) /* SMC IDMAC Descriptor List Base Addre */
  70 #define SDXC_REG_IDST   (0x88) /* SMC IDMAC Status Register */
  71 #define SDXC_REG_IDIE   (0x8C) /* SMC IDMAC Interrupt Enable Register */
  72 #define SDXC_REG_CHDA   (0x90)
  73 #define SDXC_REG_CBDA   (0x94)
  74
  75 /* New registers introduced in A64 */
  76 #define SDXC_REG_A12A           0x058 /* SMC Auto Command 12 Register */
  77 #define SDXC_REG_SD_NTSR        0x05C /* SMC New Timing Set Register */
  78 #define SDXC_REG_DRV_DL         0x140 /* Drive Delay Control Register */
  79 #define SDXC_REG_SAMP_DL_REG    0x144 /* SMC sample delay control */
  80 #define SDXC_REG_DS_DL_REG      0x148 /* SMC data strobe delay control */
  81
  82 #define mmc_readl(host, reg) \
  83         readl((host)->reg_base + SDXC_##reg)
  84 #define mmc_writel(host, reg, value) \
  85         writel((value), (host)->reg_base + SDXC_##reg)
  86
  87 /* global control register bits */
  88 #define SDXC_SOFT_RESET                 BIT(0)
  89 #define SDXC_FIFO_RESET                 BIT(1)
  90 #define SDXC_DMA_RESET                  BIT(2)
  91 #define SDXC_INTERRUPT_ENABLE_BIT       BIT(4)
  92 #define SDXC_DMA_ENABLE_BIT             BIT(5)
  93 #define SDXC_DEBOUNCE_ENABLE_BIT        BIT(8)
  94 #define SDXC_POSEDGE_LATCH_DATA         BIT(9)
  95 #define SDXC_DDR_MODE                   BIT(10)
  96 #define SDXC_MEMORY_ACCESS_DONE         BIT(29)
  97 #define SDXC_ACCESS_DONE_DIRECT         BIT(30)
  98 #define SDXC_ACCESS_BY_AHB              BIT(31)
  99 #define SDXC_ACCESS_BY_DMA              (0 << 31)
 100 #define SDXC_HARDWARE_RESET \
 101         (SDXC_SOFT_RESET | SDXC_FIFO_RESET | SDXC_DMA_RESET)
 102
 103 /* clock control bits */
 104 #define SDXC_CARD_CLOCK_ON              BIT(16)
 105 #define SDXC_LOW_POWER_ON               BIT(17)
 106
 107 /* bus width */
 108 #define SDXC_WIDTH1                     0
 109 #define SDXC_WIDTH4                     1
 110 #define SDXC_WIDTH8                     2
 111
 112 /* smc command bits */
 113 #define SDXC_RESP_EXPIRE                BIT(6)
 114 #define SDXC_LONG_RESPONSE              BIT(7)
 115 #define SDXC_CHECK_RESPONSE_CRC         BIT(8)
 116 #define SDXC_DATA_EXPIRE                BIT(9)
 117 #define SDXC_WRITE                      BIT(10)
 118 #define SDXC_SEQUENCE_MODE              BIT(11)
 119 #define SDXC_SEND_AUTO_STOP             BIT(12)
 120 #define SDXC_WAIT_PRE_OVER              BIT(13)
 121 #define SDXC_STOP_ABORT_CMD             BIT(14)
 122 #define SDXC_SEND_INIT_SEQUENCE         BIT(15)
 123 #define SDXC_UPCLK_ONLY                 BIT(21)
 124 #define SDXC_READ_CEATA_DEV             BIT(22)
 125 #define SDXC_CCS_EXPIRE                 BIT(23)
 126 #define SDXC_ENABLE_BIT_BOOT            BIT(24)
 127 #define SDXC_ALT_BOOT_OPTIONS           BIT(25)
 128 #define SDXC_BOOT_ACK_EXPIRE            BIT(26)
 129 #define SDXC_BOOT_ABORT                 BIT(27)
 130 #define SDXC_VOLTAGE_SWITCH             BIT(28)
 131 #define SDXC_USE_HOLD_REGISTER          BIT(29)
 132 #define SDXC_START                      BIT(31)
 133
 134 /* interrupt bits */
 135 #define SDXC_RESP_ERROR                 BIT(1)
 136 #define SDXC_COMMAND_DONE               BIT(2)
 137 #define SDXC_DATA_OVER                  BIT(3)
 138 #define SDXC_TX_DATA_REQUEST            BIT(4)
 139 #define SDXC_RX_DATA_REQUEST            BIT(5)
 140 #define SDXC_RESP_CRC_ERROR             BIT(6)
 141 #define SDXC_DATA_CRC_ERROR             BIT(7)
 142 #define SDXC_RESP_TIMEOUT               BIT(8)
 143 #define SDXC_DATA_TIMEOUT               BIT(9)
 144 #define SDXC_VOLTAGE_CHANGE_DONE        BIT(10)
 145 #define SDXC_FIFO_RUN_ERROR             BIT(11)
 146 #define SDXC_HARD_WARE_LOCKED           BIT(12)
 147 #define SDXC_START_BIT_ERROR            BIT(13)
 148 #define SDXC_AUTO_COMMAND_DONE          BIT(14)
 149 #define SDXC_END_BIT_ERROR              BIT(15)
 150 #define SDXC_SDIO_INTERRUPT             BIT(16)
 151 #define SDXC_CARD_INSERT                BIT(30)
 152 #define SDXC_CARD_REMOVE                BIT(31)
 153 #define SDXC_INTERRUPT_ERROR_BIT \
 154         (SDXC_RESP_ERROR | SDXC_RESP_CRC_ERROR | SDXC_DATA_CRC_ERROR | \
 155          SDXC_RESP_TIMEOUT | SDXC_DATA_TIMEOUT | SDXC_FIFO_RUN_ERROR | \
 156          SDXC_HARD_WARE_LOCKED | SDXC_START_BIT_ERROR | SDXC_END_BIT_ERROR)
 157 #define SDXC_INTERRUPT_DONE_BIT \
 158         (SDXC_AUTO_COMMAND_DONE | SDXC_DATA_OVER | \
 159          SDXC_COMMAND_DONE | SDXC_VOLTAGE_CHANGE_DONE)
 160
 161 /* status */
 162 #define SDXC_RXWL_FLAG                  BIT(0)
 163 #define SDXC_TXWL_FLAG                  BIT(1)
 164 #define SDXC_FIFO_EMPTY                 BIT(2)
 165 #define SDXC_FIFO_FULL                  BIT(3)
 166 #define SDXC_CARD_PRESENT               BIT(8)
 167 #define SDXC_CARD_DATA_BUSY             BIT(9)
 168 #define SDXC_DATA_FSM_BUSY              BIT(10)
 169 #define SDXC_DMA_REQUEST                BIT(31)
 170 #define SDXC_FIFO_SIZE                  16
 171
 172 /* Function select */
 173 #define SDXC_CEATA_ON                   (0xceaa << 16)
 174 #define SDXC_SEND_IRQ_RESPONSE          BIT(0)
 175 #define SDXC_SDIO_READ_WAIT             BIT(1)
 176 #define SDXC_ABORT_READ_DATA            BIT(2)
 177 #define SDXC_SEND_CCSD                  BIT(8)
 178 #define SDXC_SEND_AUTO_STOPCCSD         BIT(9)
 179 #define SDXC_CEATA_DEV_IRQ_ENABLE       BIT(10)
 180
 181 /* IDMA controller bus mod bit field */
 182 #define SDXC_IDMAC_SOFT_RESET           BIT(0)
 183 #define SDXC_IDMAC_FIX_BURST            BIT(1)
 184 #define SDXC_IDMAC_IDMA_ON              BIT(7)
 185 #define SDXC_IDMAC_REFETCH_DES          BIT(31)
 186
 187 /* IDMA status bit field */
 188 #define SDXC_IDMAC_TRANSMIT_INTERRUPT           BIT(0)
 189 #define SDXC_IDMAC_RECEIVE_INTERRUPT            BIT(1)
 190 #define SDXC_IDMAC_FATAL_BUS_ERROR              BIT(2)
 191 #define SDXC_IDMAC_DESTINATION_INVALID          BIT(4)
 192 #define SDXC_IDMAC_CARD_ERROR_SUM               BIT(5)
 193 #define SDXC_IDMAC_NORMAL_INTERRUPT_SUM         BIT(8)
 194 #define SDXC_IDMAC_ABNORMAL_INTERRUPT_SUM       BIT(9)
 195 #define SDXC_IDMAC_HOST_ABORT_INTERRUPT         BIT(10)
 196 #define SDXC_IDMAC_IDLE                         (0 << 13)
 197 #define SDXC_IDMAC_SUSPEND                      (1 << 13)
 198 #define SDXC_IDMAC_DESC_READ                    (2 << 13)
 199 #define SDXC_IDMAC_DESC_CHECK                   (3 << 13)
 200 #define SDXC_IDMAC_READ_REQUEST_WAIT            (4 << 13)
 201 #define SDXC_IDMAC_WRITE_REQUEST_WAIT           (5 << 13)
 202 #define SDXC_IDMAC_READ                         (6 << 13)
 203 #define SDXC_IDMAC_WRITE                        (7 << 13)
 204 #define SDXC_IDMAC_DESC_CLOSE                   (8 << 13)
 205
 206 /*
 207 * If the idma-des-size-bits of property is ie 13, bufsize bits are:
 208 *  Bits  0-12: buf1 size
 209 *  Bits 13-25: buf2 size
 210 *  Bits 26-31: not used
 211 * Since we only ever set buf1 size, we can simply store it directly.
 212 */
 213 #define SDXC_IDMAC_DES0_DIC     BIT(1)  /* disable interrupt on completion */
 214 #define SDXC_IDMAC_DES0_LD      BIT(2)  /* last descriptor */
 215 #define SDXC_IDMAC_DES0_FD      BIT(3)  /* first descriptor */
 216 #define SDXC_IDMAC_DES0_CH      BIT(4)  /* chain mode */
 217 #define SDXC_IDMAC_DES0_ER      BIT(5)  /* end of ring */
 218 #define SDXC_IDMAC_DES0_CES     BIT(30) /* card error summary */
 219 #define SDXC_IDMAC_DES0_OWN     BIT(31) /* 1-idma owns it, 0-host owns it */
 220
 221 #define SDXC_CLK_400K           0
 222 #define SDXC_CLK_25M            1
 223 #define SDXC_CLK_50M            2
 224 #define SDXC_CLK_50M_DDR        3
 225 #define SDXC_CLK_50M_DDR_8BIT   4
 226
 227 #define SDXC_2X_TIMING_MODE     BIT(31)
 228
 229 #define SDXC_CAL_START          BIT(15)
 230 #define SDXC_CAL_DONE           BIT(14)
 231 #define SDXC_CAL_DL_SHIFT       8
 232 #define SDXC_CAL_DL_SW_EN       BIT(7)
 233 #define SDXC_CAL_DL_SW_SHIFT    0
 234 #define SDXC_CAL_DL_MASK        0x3f
 235
 236 #define SDXC_CAL_TIMEOUT        3       /* in seconds, 3s is enough*/
 237
 238 struct sunxi_mmc_clk_delay {
 239         u32 output;
 240         u32 sample;
 241 };
 242
 243 struct sunxi_idma_des {
 244         __le32 config;
 245         __le32 buf_size;
 246         __le32 buf_addr_ptr1;
 247         __le32 buf_addr_ptr2;
 248 };
 249
 250 struct sunxi_mmc_cfg {
 251         u32 idma_des_size_bits;
 252         const struct sunxi_mmc_clk_delay *clk_delays;
 253
 254         /* does the IP block support autocalibration? */
 255         bool can_calibrate;
 256 };
 257
 258 struct sunxi_mmc_host {
 259         struct mmc_host *mmc;
 260         struct reset_control *reset;
 261         const struct sunxi_mmc_cfg *cfg;
 262
 263         /* IO mapping base */
 264         void __iomem    *reg_base;
 265
 266         /* clock management */
 267         struct clk      *clk_ahb;
 268         struct clk      *clk_mmc;
 269         struct clk      *clk_sample;
 270         struct clk      *clk_output;
 271
 272         /* irq */
 273         spinlock_t      lock;
 274         int             irq;
 275         u32             int_sum;
 276         u32             sdio_imask;
 277
 278         /* dma */
 279         dma_addr_t      sg_dma;
 280         void            *sg_cpu;
 281         bool            wait_dma;
 282
 283         struct mmc_request *mrq;
 284         struct mmc_request *manual_stop_mrq;
 285         int             ferror;
 286
 287         /* vqmmc */
 288         bool            vqmmc_enabled;
 289 };
 290
 291 static int sunxi_mmc_reset_host(struct sunxi_mmc_host *host)
 292 {
 293         unsigned long expire = jiffies + msecs_to_jiffies(250);
 294         u32 rval;
 295
 296         mmc_writel(host, REG_GCTRL, SDXC_HARDWARE_RESET);
 297         do {
 298                 rval = mmc_readl(host, REG_GCTRL);
 299         } while (time_before(jiffies, expire) && (rval & SDXC_HARDWARE_RESET));
 300
 301         if (rval & SDXC_HARDWARE_RESET) {
 302                 dev_err(mmc_dev(host->mmc), "fatal err reset timeout\n");
 303                 return -EIO;
 304         }
 305
 306         return 0;
 307 }
 308
 309 static int sunxi_mmc_init_host(struct mmc_host *mmc)
 310 {
 311         u32 rval;
 312         struct sunxi_mmc_host *host = mmc_priv(mmc);
 313
 314         if (sunxi_mmc_reset_host(host))
 315                 return -EIO;
 316
 317         /*
 318          * Burst 8 transfers, RX trigger level: 7, TX trigger level: 8
 319          *
 320          * TODO: sun9i has a larger FIFO and supports higher trigger values
 321          */
 322         mmc_writel(host, REG_FTRGL, 0x20070008);
 323         /* Maximum timeout value */
 324         mmc_writel(host, REG_TMOUT, 0xffffffff);
 325         /* Unmask SDIO interrupt if needed */
 326         mmc_writel(host, REG_IMASK, host->sdio_imask);
 327         /* Clear all pending interrupts */
 328         mmc_writel(host, REG_RINTR, 0xffffffff);
 329         /* Debug register? undocumented */
 330         mmc_writel(host, REG_DBGC, 0xdeb);
 331         /* Enable CEATA support */
 332         mmc_writel(host, REG_FUNS, SDXC_CEATA_ON);
 333         /* Set DMA descriptor list base address */
 334         mmc_writel(host, REG_DLBA, host->sg_dma);
 335
 336         rval = mmc_readl(host, REG_GCTRL);
 337         rval |= SDXC_INTERRUPT_ENABLE_BIT;
 338         /* Undocumented, but found in Allwinner code */
 339         rval &= ~SDXC_ACCESS_DONE_DIRECT;
 340         mmc_writel(host, REG_GCTRL, rval);
 341
 342         return 0;
 343 }
 344
 345 static void sunxi_mmc_init_idma_des(struct sunxi_mmc_host *host,
 346                                     struct mmc_data *data)
 347 {
 348         struct sunxi_idma_des *pdes = (struct sunxi_idma_des *)host->sg_cpu;
 349         dma_addr_t next_desc = host->sg_dma;
 350         int i, max_len = (1 << host->cfg->idma_des_size_bits);
 351
 352         for (i = 0; i < data->sg_len; i++) {
 353                 pdes[i].config = cpu_to_le32(SDXC_IDMAC_DES0_CH |
 354                                              SDXC_IDMAC_DES0_OWN |
 355                                              SDXC_IDMAC_DES0_DIC);
 356
 357                 if (data->sg[i].length == max_len)
 358                         pdes[i].buf_size = 0; /* 0 == max_len */
 359                 else
 360                         pdes[i].buf_size = cpu_to_le32(data->sg[i].length);
 361
 362                 next_desc += sizeof(struct sunxi_idma_des);
 363                 pdes[i].buf_addr_ptr1 =
 364                         cpu_to_le32(sg_dma_address(&data->sg[i]));
 365                 pdes[i].buf_addr_ptr2 = cpu_to_le32((u32)next_desc);
 366         }
 367
 368         pdes[0].config |= cpu_to_le32(SDXC_IDMAC_DES0_FD);
 369         pdes[i - 1].config |= cpu_to_le32(SDXC_IDMAC_DES0_LD |
 370                                           SDXC_IDMAC_DES0_ER);
 371         pdes[i - 1].config &= cpu_to_le32(~SDXC_IDMAC_DES0_DIC);
 372         pdes[i - 1].buf_addr_ptr2 = 0;
 373
 374         /*
 375          * Avoid the io-store starting the idmac hitting io-mem before the
 376          * descriptors hit the main-mem.
 377          */
 378         wmb();
 379 }
 380
 381 static enum dma_data_direction sunxi_mmc_get_dma_dir(struct mmc_data *data)
 382 {
 383         if (data->flags & MMC_DATA_WRITE)
 384                 return DMA_TO_DEVICE;
 385         else
 386                 return DMA_FROM_DEVICE;
 387 }
 388
 389 static int sunxi_mmc_map_dma(struct sunxi_mmc_host *host,
 390                              struct mmc_data *data)
 391 {
 392         u32 i, dma_len;
 393         struct scatterlist *sg;
 394
 395         dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 396                              sunxi_mmc_get_dma_dir(data));
 397         if (dma_len == 0) {
 398                 dev_err(mmc_dev(host->mmc), "dma_map_sg failed\n");
 399                 return -ENOMEM;
 400         }
 401
 402         for_each_sg(data->sg, sg, data->sg_len, i) {
 403                 if (sg->offset & 3 || sg->length & 3) {
 404                         dev_err(mmc_dev(host->mmc),
 405                                 "unaligned scatterlist: os %x length %d\n",
 406                                 sg->offset, sg->length);
 407                         return -EINVAL;
 408                 }
 409         }
 410
 411         return 0;
 412 }
 413
 414 static void sunxi_mmc_start_dma(struct sunxi_mmc_host *host,
 415                                 struct mmc_data *data)
 416 {
 417         u32 rval;
 418
 419         sunxi_mmc_init_idma_des(host, data);
 420
 421         rval = mmc_readl(host, REG_GCTRL);
 422         rval |= SDXC_DMA_ENABLE_BIT;
 423         mmc_writel(host, REG_GCTRL, rval);
 424         rval |= SDXC_DMA_RESET;
 425         mmc_writel(host, REG_GCTRL, rval);
 426
 427         mmc_writel(host, REG_DMAC, SDXC_IDMAC_SOFT_RESET);
 428
 429         if (!(data->flags & MMC_DATA_WRITE))
 430                 mmc_writel(host, REG_IDIE, SDXC_IDMAC_RECEIVE_INTERRUPT);
 431
 432         mmc_writel(host, REG_DMAC,
 433                    SDXC_IDMAC_FIX_BURST | SDXC_IDMAC_IDMA_ON);
 434 }
 435
 436 static void sunxi_mmc_send_manual_stop(struct sunxi_mmc_host *host,
 437                                        struct mmc_request *req)
 438 {
 439         u32 arg, cmd_val, ri;
 440         unsigned long expire = jiffies + msecs_to_jiffies(1000);
 441
 442         cmd_val = SDXC_START | SDXC_RESP_EXPIRE |
 443                   SDXC_STOP_ABORT_CMD | SDXC_CHECK_RESPONSE_CRC;
 444
 445         if (req->cmd->opcode == SD_IO_RW_EXTENDED) {
 446                 cmd_val |= SD_IO_RW_DIRECT;
 447                 arg = (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
 448                       ((req->cmd->arg >> 28) & 0x7);
 449         } else {
 450                 cmd_val |= MMC_STOP_TRANSMISSION;
 451                 arg = 0;
 452         }
 453
 454         mmc_writel(host, REG_CARG, arg);
 455         mmc_writel(host, REG_CMDR, cmd_val);
 456
 457         do {
 458                 ri = mmc_readl(host, REG_RINTR);
 459         } while (!(ri & (SDXC_COMMAND_DONE | SDXC_INTERRUPT_ERROR_BIT)) &&
 460                  time_before(jiffies, expire));
 461
 462         if (!(ri & SDXC_COMMAND_DONE) || (ri & SDXC_INTERRUPT_ERROR_BIT)) {
 463                 dev_err(mmc_dev(host->mmc), "send stop command failed\n");
 464                 if (req->stop)
 465                         req->stop->resp[0] = -ETIMEDOUT;
 466         } else {
 467                 if (req->stop)
 468                         req->stop->resp[0] = mmc_readl(host, REG_RESP0);
 469         }
 470
 471         mmc_writel(host, REG_RINTR, 0xffff);
 472 }
 473
 474 static void sunxi_mmc_dump_errinfo(struct sunxi_mmc_host *host)
 475 {
 476         struct mmc_command *cmd = host->mrq->cmd;
 477         struct mmc_data *data = host->mrq->data;
 478
 479         /* For some cmds timeout is normal with sd/mmc cards */
 480         if ((host->int_sum & SDXC_INTERRUPT_ERROR_BIT) ==
 481                 SDXC_RESP_TIMEOUT && (cmd->opcode == SD_IO_SEND_OP_COND ||
 482                                       cmd->opcode == SD_IO_RW_DIRECT))
 483                 return;
 484
 485         dev_err(mmc_dev(host->mmc),
 486                 "smc %d err, cmd %d,%s%s%s%s%s%s%s%s%s%s !!\n",
 487                 host->mmc->index, cmd->opcode,
 488                 data ? (data->flags & MMC_DATA_WRITE ? " WR" : " RD") : "",
 489                 host->int_sum & SDXC_RESP_ERROR     ? " RE"     : "",
 490                 host->int_sum & SDXC_RESP_CRC_ERROR  ? " RCE"    : "",
 491                 host->int_sum & SDXC_DATA_CRC_ERROR  ? " DCE"    : "",
 492                 host->int_sum & SDXC_RESP_TIMEOUT ? " RTO"    : "",
 493                 host->int_sum & SDXC_DATA_TIMEOUT ? " DTO"    : "",
 494                 host->int_sum & SDXC_FIFO_RUN_ERROR  ? " FE"     : "",
 495                 host->int_sum & SDXC_HARD_WARE_LOCKED ? " HL"     : "",
 496                 host->int_sum & SDXC_START_BIT_ERROR ? " SBE"    : "",
 497                 host->int_sum & SDXC_END_BIT_ERROR   ? " EBE"    : ""
 498                 );
 499 }
 500
 501 /* Called in interrupt context! */
 502 static irqreturn_t sunxi_mmc_finalize_request(struct sunxi_mmc_host *host)
 503 {
 504         struct mmc_request *mrq = host->mrq;
 505         struct mmc_data *data = mrq->data;
 506         u32 rval;
 507
 508         mmc_writel(host, REG_IMASK, host->sdio_imask);
 509         mmc_writel(host, REG_IDIE, 0);
 510
 511         if (host->int_sum & SDXC_INTERRUPT_ERROR_BIT) {
 512                 sunxi_mmc_dump_errinfo(host);
 513                 mrq->cmd->error = -ETIMEDOUT;
 514
 515                 if (data) {
 516                         data->error = -ETIMEDOUT;
 517                         host->manual_stop_mrq = mrq;
 518                 }
 519
 520                 if (mrq->stop)
 521                         mrq->stop->error = -ETIMEDOUT;
 522         } else {
 523                 if (mrq->cmd->flags & MMC_RSP_136) {
 524                         mrq->cmd->resp[0] = mmc_readl(host, REG_RESP3);
 525                         mrq->cmd->resp[1] = mmc_readl(host, REG_RESP2);
 526                         mrq->cmd->resp[2] = mmc_readl(host, REG_RESP1);
 527                         mrq->cmd->resp[3] = mmc_readl(host, REG_RESP0);
 528                 } else {
 529                         mrq->cmd->resp[0] = mmc_readl(host, REG_RESP0);
 530                 }
 531
 532                 if (data)
 533                         data->bytes_xfered = data->blocks * data->blksz;
 534         }
 535
 536         if (data) {
 537                 mmc_writel(host, REG_IDST, 0x337);
 538                 mmc_writel(host, REG_DMAC, 0);
 539                 rval = mmc_readl(host, REG_GCTRL);
 540                 rval |= SDXC_DMA_RESET;
 541                 mmc_writel(host, REG_GCTRL, rval);
 542                 rval &= ~SDXC_DMA_ENABLE_BIT;
 543                 mmc_writel(host, REG_GCTRL, rval);
 544                 rval |= SDXC_FIFO_RESET;
 545                 mmc_writel(host, REG_GCTRL, rval);
 546                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 547                                      sunxi_mmc_get_dma_dir(data));
 548         }
 549
 550         mmc_writel(host, REG_RINTR, 0xffff);
 551
 552         host->mrq = NULL;
 553         host->int_sum = 0;
 554         host->wait_dma = false;
 555
 556         return host->manual_stop_mrq ? IRQ_WAKE_THREAD : IRQ_HANDLED;
 557 }
 558
 559 static irqreturn_t sunxi_mmc_irq(int irq, void *dev_id)
 560 {
 561         struct sunxi_mmc_host *host = dev_id;
 562         struct mmc_request *mrq;
 563         u32 msk_int, idma_int;
 564         bool finalize = false;
 565         bool sdio_int = false;
 566         irqreturn_t ret = IRQ_HANDLED;
 567
 568         spin_lock(&host->lock);
 569
 570         idma_int  = mmc_readl(host, REG_IDST);
 571         msk_int   = mmc_readl(host, REG_MISTA);
 572
 573         dev_dbg(mmc_dev(host->mmc), "irq: rq %p mi %08x idi %08x\n",
 574                 host->mrq, msk_int, idma_int);
 575
 576         mrq = host->mrq;
 577         if (mrq) {
 578                 if (idma_int & SDXC_IDMAC_RECEIVE_INTERRUPT)
 579                         host->wait_dma = false;
 580
 581                 host->int_sum |= msk_int;
 582
 583                 /* Wait for COMMAND_DONE on RESPONSE_TIMEOUT before finalize */
 584                 if ((host->int_sum & SDXC_RESP_TIMEOUT) &&
 585                                 !(host->int_sum & SDXC_COMMAND_DONE))
 586                         mmc_writel(host, REG_IMASK,
 587                                    host->sdio_imask | SDXC_COMMAND_DONE);
 588                 /* Don't wait for dma on error */
 589                 else if (host->int_sum & SDXC_INTERRUPT_ERROR_BIT)
 590                         finalize = true;
 591                 else if ((host->int_sum & SDXC_INTERRUPT_DONE_BIT) &&
 592                                 !host->wait_dma)
 593                         finalize = true;
 594         }
 595
 596         if (msk_int & SDXC_SDIO_INTERRUPT)
 597                 sdio_int = true;
 598
 599         mmc_writel(host, REG_RINTR, msk_int);
 600         mmc_writel(host, REG_IDST, idma_int);
 601
 602         if (finalize)
 603                 ret = sunxi_mmc_finalize_request(host);
 604
 605         spin_unlock(&host->lock);
 606
 607         if (finalize && ret == IRQ_HANDLED)
 608                 mmc_request_done(host->mmc, mrq);
 609
 610         if (sdio_int)
 611                 mmc_signal_sdio_irq(host->mmc);
 612
 613         return ret;
 614 }
 615
 616 static irqreturn_t sunxi_mmc_handle_manual_stop(int irq, void *dev_id)
 617 {
 618         struct sunxi_mmc_host *host = dev_id;
 619         struct mmc_request *mrq;
 620         unsigned long iflags;
 621
 622         spin_lock_irqsave(&host->lock, iflags);
 623         mrq = host->manual_stop_mrq;
 624         spin_unlock_irqrestore(&host->lock, iflags);
 625
 626         if (!mrq) {
 627                 dev_err(mmc_dev(host->mmc), "no request for manual stop\n");
 628                 return IRQ_HANDLED;
 629         }
 630
 631         dev_err(mmc_dev(host->mmc), "data error, sending stop command\n");
 632
 633         /*
 634          * We will never have more than one outstanding request,
 635          * and we do not complete the request until after
 636          * we've cleared host->manual_stop_mrq so we do not need to
 637          * spin lock this function.
 638          * Additionally we have wait states within this function
 639          * so having it in a lock is a very bad idea.
 640          */
 641         sunxi_mmc_send_manual_stop(host, mrq);
 642
 643         spin_lock_irqsave(&host->lock, iflags);
 644         host->manual_stop_mrq = NULL;
 645         spin_unlock_irqrestore(&host->lock, iflags);
 646
 647         mmc_request_done(host->mmc, mrq);
 648
 649         return IRQ_HANDLED;
 650 }
 651
 652 static int sunxi_mmc_oclk_onoff(struct sunxi_mmc_host *host, u32 oclk_en)
 653 {
 654         unsigned long expire = jiffies + msecs_to_jiffies(750);
 655         u32 rval;
 656
 657         rval = mmc_readl(host, REG_CLKCR);
 658         rval &= ~(SDXC_CARD_CLOCK_ON | SDXC_LOW_POWER_ON);
 659
 660         if (oclk_en)
 661                 rval |= SDXC_CARD_CLOCK_ON;
 662
 663         mmc_writel(host, REG_CLKCR, rval);
 664
 665         rval = SDXC_START | SDXC_UPCLK_ONLY | SDXC_WAIT_PRE_OVER;
 666         mmc_writel(host, REG_CMDR, rval);
 667
 668         do {
 669                 rval = mmc_readl(host, REG_CMDR);
 670         } while (time_before(jiffies, expire) && (rval & SDXC_START));
 671
 672         /* clear irq status bits set by the command */
 673         mmc_writel(host, REG_RINTR,
 674                    mmc_readl(host, REG_RINTR) & ~SDXC_SDIO_INTERRUPT);
 675
 676         if (rval & SDXC_START) {
 677                 dev_err(mmc_dev(host->mmc), "fatal err update clk timeout\n");
 678                 return -EIO;
 679         }
 680
 681         return 0;
 682 }
 683
 684 static int sunxi_mmc_calibrate(struct sunxi_mmc_host *host, int reg_off)
 685 {
 686         u32 reg = readl(host->reg_base + reg_off);
 687         u32 delay;
 688         unsigned long timeout;
 689
 690         if (!host->cfg->can_calibrate)
 691                 return 0;
 692
 693         reg &= ~(SDXC_CAL_DL_MASK << SDXC_CAL_DL_SW_SHIFT);
 694         reg &= ~SDXC_CAL_DL_SW_EN;
 695
 696         writel(reg | SDXC_CAL_START, host->reg_base + reg_off);
 697
 698         dev_dbg(mmc_dev(host->mmc), "calibration started\n");
 699
 700         timeout = jiffies + HZ * SDXC_CAL_TIMEOUT;
 701
 702         while (!((reg = readl(host->reg_base + reg_off)) & SDXC_CAL_DONE)) {
 703                 if (time_before(jiffies, timeout))
 704                         cpu_relax();
 705                 else {
 706                         reg &= ~SDXC_CAL_START;
 707                         writel(reg, host->reg_base + reg_off);
 708
 709                         return -ETIMEDOUT;
 710                 }
 711         }
 712
 713         delay = (reg >> SDXC_CAL_DL_SHIFT) & SDXC_CAL_DL_MASK;
 714
 715         reg &= ~SDXC_CAL_START;
 716         reg |= (delay << SDXC_CAL_DL_SW_SHIFT) | SDXC_CAL_DL_SW_EN;
 717
 718         writel(reg, host->reg_base + reg_off);
 719
 720         dev_dbg(mmc_dev(host->mmc), "calibration ended, reg is 0x%x\n", reg);
 721
 722         return 0;
 723 }
 724
 725 static int sunxi_mmc_clk_set_phase(struct sunxi_mmc_host *host,
 726                                    struct mmc_ios *ios, u32 rate)
 727 {
 728         int index;
 729
 730         if (!host->cfg->clk_delays)
 731                 return 0;
 732
 733         /* determine delays */
 734         if (rate <= 400000) {
 735                 index = SDXC_CLK_400K;
 736         } else if (rate <= 25000000) {
 737                 index = SDXC_CLK_25M;
 738         } else if (rate <= 52000000) {
 739                 if (ios->timing != MMC_TIMING_UHS_DDR50 &&
 740                     ios->timing != MMC_TIMING_MMC_DDR52) {
 741                         index = SDXC_CLK_50M;
 742                 } else if (ios->bus_width == MMC_BUS_WIDTH_8) {
 743                         index = SDXC_CLK_50M_DDR_8BIT;
 744                 } else {
 745                         index = SDXC_CLK_50M_DDR;
 746                 }
 747         } else {
 748                 return -EINVAL;
 749         }
 750
 751         clk_set_phase(host->clk_sample, host->cfg->clk_delays[index].sample);
 752         clk_set_phase(host->clk_output, host->cfg->clk_delays[index].output);
 753
 754         return 0;
 755 }
 756
 757 static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
 758                                   struct mmc_ios *ios)
 759 {
 760         long rate;
 761         u32 rval, clock = ios->clock;
 762         int ret;
 763
 764         /* 8 bit DDR requires a higher module clock */
 765         if (ios->timing == MMC_TIMING_MMC_DDR52 &&
 766             ios->bus_width == MMC_BUS_WIDTH_8)
 767                 clock <<= 1;
 768
 769         rate = clk_round_rate(host->clk_mmc, clock);
 770         if (rate < 0) {
 771                 dev_err(mmc_dev(host->mmc), "error rounding clk to %d: %ld\n",
 772                         clock, rate);
 773                 return rate;
 774         }
 775         dev_dbg(mmc_dev(host->mmc), "setting clk to %d, rounded %ld\n",
 776                 clock, rate);
 777
 778         /* setting clock rate */
 779         ret = clk_set_rate(host->clk_mmc, rate);
 780         if (ret) {
 781                 dev_err(mmc_dev(host->mmc), "error setting clk to %ld: %d\n",
 782                         rate, ret);
 783                 return ret;
 784         }
 785
 786         ret = sunxi_mmc_oclk_onoff(host, 0);
 787         if (ret)
 788                 return ret;
 789
 790         /* clear internal divider */
 791         rval = mmc_readl(host, REG_CLKCR);
 792         rval &= ~0xff;
 793         /* set internal divider for 8 bit eMMC DDR, so card clock is right */
 794         if (ios->timing == MMC_TIMING_MMC_DDR52 &&
 795             ios->bus_width == MMC_BUS_WIDTH_8) {
 796                 rval |= 1;
 797                 rate >>= 1;
 798         }
 799         mmc_writel(host, REG_CLKCR, rval);
 800
 801         ret = sunxi_mmc_clk_set_phase(host, ios, rate);
 802         if (ret)
 803                 return ret;
 804
 805         ret = sunxi_mmc_calibrate(host, SDXC_REG_SAMP_DL_REG);
 806         if (ret)
 807                 return ret;
 808
 809         /* TODO: enable calibrate on sdc2 SDXC_REG_DS_DL_REG of A64 */
 810
 811         return sunxi_mmc_oclk_onoff(host, 1);
 812 }
 813
 814 static void sunxi_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 815 {
 816         struct sunxi_mmc_host *host = mmc_priv(mmc);
 817         u32 rval;
 818
 819         /* Set the power state */
 820         switch (ios->power_mode) {
 821         case MMC_POWER_ON:
 822                 break;
 823
 824         case MMC_POWER_UP:
 825                 host->ferror = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
 826                                                      ios->vdd);
 827                 if (host->ferror)
 828                         return;
 829
 830                 if (!IS_ERR(mmc->supply.vqmmc)) {
 831                         host->ferror = regulator_enable(mmc->supply.vqmmc);
 832                         if (host->ferror) {
 833                                 dev_err(mmc_dev(mmc),
 834                                         "failed to enable vqmmc\n");
 835                                 return;
 836                         }
 837                         host->vqmmc_enabled = true;
 838                 }
 839
 840                 host->ferror = sunxi_mmc_init_host(mmc);
 841                 if (host->ferror)
 842                         return;
 843
 844                 dev_dbg(mmc_dev(mmc), "power on!\n");
 845                 break;
 846
 847         case MMC_POWER_OFF:
 848                 dev_dbg(mmc_dev(mmc), "power off!\n");
 849                 sunxi_mmc_reset_host(host);
 850                 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
 851                 if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled)
 852                         regulator_disable(mmc->supply.vqmmc);
 853                 host->vqmmc_enabled = false;
 854                 break;
 855         }
 856
 857         /* set bus width */
 858         switch (ios->bus_width) {
 859         case MMC_BUS_WIDTH_1:
 860                 mmc_writel(host, REG_WIDTH, SDXC_WIDTH1);
 861                 break;
 862         case MMC_BUS_WIDTH_4:
 863                 mmc_writel(host, REG_WIDTH, SDXC_WIDTH4);
 864                 break;
 865         case MMC_BUS_WIDTH_8:
 866                 mmc_writel(host, REG_WIDTH, SDXC_WIDTH8);
 867                 break;
 868         }
 869
 870         /* set ddr mode */
 871         rval = mmc_readl(host, REG_GCTRL);
 872         if (ios->timing == MMC_TIMING_UHS_DDR50 ||
 873             ios->timing == MMC_TIMING_MMC_DDR52)
 874                 rval |= SDXC_DDR_MODE;
 875         else
 876                 rval &= ~SDXC_DDR_MODE;
 877         mmc_writel(host, REG_GCTRL, rval);
 878
 879         /* set up clock */
 880         if (ios->clock && ios->power_mode) {
 881                 host->ferror = sunxi_mmc_clk_set_rate(host, ios);
 882                 /* Android code had a usleep_range(50000, 55000); here */
 883         }
 884 }
 885
 886 static int sunxi_mmc_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
 887 {
 888         /* vqmmc regulator is available */
 889         if (!IS_ERR(mmc->supply.vqmmc))
 890                 return mmc_regulator_set_vqmmc(mmc, ios);
 891
 892         /* no vqmmc regulator, assume fixed regulator at 3/3.3V */
 893         if (mmc->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330)
 894                 return 0;
 895
 896         return -EINVAL;
 897 }
 898
 899 static void sunxi_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
 900 {
 901         struct sunxi_mmc_host *host = mmc_priv(mmc);
 902         unsigned long flags;
 903         u32 imask;
 904
 905         spin_lock_irqsave(&host->lock, flags);
 906
 907         imask = mmc_readl(host, REG_IMASK);
 908         if (enable) {
 909                 host->sdio_imask = SDXC_SDIO_INTERRUPT;
 910                 imask |= SDXC_SDIO_INTERRUPT;
 911         } else {
 912                 host->sdio_imask = 0;
 913                 imask &= ~SDXC_SDIO_INTERRUPT;
 914         }
 915         mmc_writel(host, REG_IMASK, imask);
 916         spin_unlock_irqrestore(&host->lock, flags);
 917 }
 918
 919 static void sunxi_mmc_hw_reset(struct mmc_host *mmc)
 920 {
 921         struct sunxi_mmc_host *host = mmc_priv(mmc);
 922         mmc_writel(host, REG_HWRST, 0);
 923         udelay(10);
 924         mmc_writel(host, REG_HWRST, 1);
 925         udelay(300);
 926 }
 927
 928 static void sunxi_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 929 {
 930         struct sunxi_mmc_host *host = mmc_priv(mmc);
 931         struct mmc_command *cmd = mrq->cmd;
 932         struct mmc_data *data = mrq->data;
 933         unsigned long iflags;
 934         u32 imask = SDXC_INTERRUPT_ERROR_BIT;
 935         u32 cmd_val = SDXC_START | (cmd->opcode & 0x3f);
 936         bool wait_dma = host->wait_dma;
 937         int ret;
 938
 939         /* Check for set_ios errors (should never happen) */
 940         if (host->ferror) {
 941                 mrq->cmd->error = host->ferror;
 942                 mmc_request_done(mmc, mrq);
 943                 return;
 944         }
 945
 946         if (data) {
 947                 ret = sunxi_mmc_map_dma(host, data);
 948                 if (ret < 0) {
 949                         dev_err(mmc_dev(mmc), "map DMA failed\n");
 950                         cmd->error = ret;
 951                         data->error = ret;
 952                         mmc_request_done(mmc, mrq);
 953                         return;
 954                 }
 955         }
 956
 957         if (cmd->opcode == MMC_GO_IDLE_STATE) {
 958                 cmd_val |= SDXC_SEND_INIT_SEQUENCE;
 959                 imask |= SDXC_COMMAND_DONE;
 960         }
 961
 962         if (cmd->flags & MMC_RSP_PRESENT) {
 963                 cmd_val |= SDXC_RESP_EXPIRE;
 964                 if (cmd->flags & MMC_RSP_136)
 965                         cmd_val |= SDXC_LONG_RESPONSE;
 966                 if (cmd->flags & MMC_RSP_CRC)
 967                         cmd_val |= SDXC_CHECK_RESPONSE_CRC;
 968
 969                 if ((cmd->flags & MMC_CMD_MASK) == MMC_CMD_ADTC) {
 970                         cmd_val |= SDXC_DATA_EXPIRE | SDXC_WAIT_PRE_OVER;
 971
 972                         if (cmd->data->stop) {
 973                                 imask |= SDXC_AUTO_COMMAND_DONE;
 974                                 cmd_val |= SDXC_SEND_AUTO_STOP;
 975                         } else {
 976                                 imask |= SDXC_DATA_OVER;
 977                         }
 978
 979                         if (cmd->data->flags & MMC_DATA_WRITE)
 980                                 cmd_val |= SDXC_WRITE;
 981                         else
 982                                 wait_dma = true;
 983                 } else {
 984                         imask |= SDXC_COMMAND_DONE;
 985                 }
 986         } else {
 987                 imask |= SDXC_COMMAND_DONE;
 988         }
 989
 990         dev_dbg(mmc_dev(mmc), "cmd %d(%08x) arg %x ie 0x%08x len %d\n",
 991                 cmd_val & 0x3f, cmd_val, cmd->arg, imask,
 992                 mrq->data ? mrq->data->blksz * mrq->data->blocks : 0);
 993
 994         spin_lock_irqsave(&host->lock, iflags);
 995
 996         if (host->mrq || host->manual_stop_mrq) {
 997                 spin_unlock_irqrestore(&host->lock, iflags);
 998
 999                 if (data)
1000                         dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len,
1001                                      sunxi_mmc_get_dma_dir(data));
1002
1003                 dev_err(mmc_dev(mmc), "request already pending\n");
1004                 mrq->cmd->error = -EBUSY;
1005                 mmc_request_done(mmc, mrq);
1006                 return;
1007         }
1008
1009         if (data) {
1010                 mmc_writel(host, REG_BLKSZ, data->blksz);
1011                 mmc_writel(host, REG_BCNTR, data->blksz * data->blocks);
1012                 sunxi_mmc_start_dma(host, data);
1013         }
1014
1015         host->mrq = mrq;
1016         host->wait_dma = wait_dma;
1017         mmc_writel(host, REG_IMASK, host->sdio_imask | imask);
1018         mmc_writel(host, REG_CARG, cmd->arg);
1019         mmc_writel(host, REG_CMDR, cmd_val);
1020
1021         spin_unlock_irqrestore(&host->lock, iflags);
1022 }
1023
1024 static int sunxi_mmc_card_busy(struct mmc_host *mmc)
1025 {
1026         struct sunxi_mmc_host *host = mmc_priv(mmc);
1027
1028         return !!(mmc_readl(host, REG_STAS) & SDXC_CARD_DATA_BUSY);
1029 }
1030
1031 static struct mmc_host_ops sunxi_mmc_ops = {
1032         .request         = sunxi_mmc_request,
1033         .set_ios         = sunxi_mmc_set_ios,
1034         .get_ro          = mmc_gpio_get_ro,
1035         .get_cd          = mmc_gpio_get_cd,
1036         .enable_sdio_irq = sunxi_mmc_enable_sdio_irq,
1037         .start_signal_voltage_switch = sunxi_mmc_volt_switch,
1038         .hw_reset        = sunxi_mmc_hw_reset,
1039         .card_busy       = sunxi_mmc_card_busy,
1040 };
1041
1042 static const struct sunxi_mmc_clk_delay sunxi_mmc_clk_delays[] = {
1043         [SDXC_CLK_400K]         = { .output = 180, .sample = 180 },
1044         [SDXC_CLK_25M]          = { .output = 180, .sample =  75 },
1045         [SDXC_CLK_50M]          = { .output =  90, .sample = 120 },
1046         [SDXC_CLK_50M_DDR]      = { .output =  60, .sample = 120 },
1047         /* Value from A83T "new timing mode". Works but might not be right. */
1048         [SDXC_CLK_50M_DDR_8BIT] = { .output =  90, .sample = 180 },
1049 };
1050
1051 static const struct sunxi_mmc_clk_delay sun9i_mmc_clk_delays[] = {
1052         [SDXC_CLK_400K]         = { .output = 180, .sample = 180 },
1053         [SDXC_CLK_25M]          = { .output = 180, .sample =  75 },
1054         [SDXC_CLK_50M]          = { .output = 150, .sample = 120 },
1055         [SDXC_CLK_50M_DDR]      = { .output =  54, .sample =  36 },
1056         [SDXC_CLK_50M_DDR_8BIT] = { .output =  72, .sample =  72 },
1057 };
1058
1059 static const struct sunxi_mmc_cfg sun4i_a10_cfg = {
1060         .idma_des_size_bits = 13,
1061         .clk_delays = NULL,
1062         .can_calibrate = false,
1063 };
1064
1065 static const struct sunxi_mmc_cfg sun5i_a13_cfg = {
1066         .idma_des_size_bits = 16,
1067         .clk_delays = NULL,
1068         .can_calibrate = false,
1069 };
1070
1071 static const struct sunxi_mmc_cfg sun7i_a20_cfg = {
1072         .idma_des_size_bits = 16,
1073         .clk_delays = sunxi_mmc_clk_delays,
1074         .can_calibrate = false,
1075 };
1076
1077 static const struct sunxi_mmc_cfg sun9i_a80_cfg = {
1078         .idma_des_size_bits = 16,
1079         .clk_delays = sun9i_mmc_clk_delays,
1080         .can_calibrate = false,
1081 };
1082
1083 static const struct sunxi_mmc_cfg sun50i_a64_cfg = {
1084         .idma_des_size_bits = 16,
1085         .clk_delays = NULL,
1086         .can_calibrate = true,
1087 };
1088
1089 static const struct of_device_id sunxi_mmc_of_match[] = {
1090         { .compatible = "allwinner,sun4i-a10-mmc", .data = &sun4i_a10_cfg },
1091         { .compatible = "allwinner,sun5i-a13-mmc", .data = &sun5i_a13_cfg },
1092         { .compatible = "allwinner,sun7i-a20-mmc", .data = &sun7i_a20_cfg },
1093         { .compatible = "allwinner,sun9i-a80-mmc", .data = &sun9i_a80_cfg },
1094         { .compatible = "allwinner,sun50i-a64-mmc", .data = &sun50i_a64_cfg },
1095         { /* sentinel */ }
1096 };
1097 MODULE_DEVICE_TABLE(of, sunxi_mmc_of_match);
1098
1099 static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host,
1100                                       struct platform_device *pdev)
1101 {
1102         int ret;
1103
1104         host->cfg = of_device_get_match_data(&pdev->dev);
1105         if (!host->cfg)
1106                 return -EINVAL;
1107
1108         ret = mmc_regulator_get_supply(host->mmc);
1109         if (ret) {
1110                 if (ret != -EPROBE_DEFER)
1111                         dev_err(&pdev->dev, "Could not get vmmc supply\n");
1112                 return ret;
1113         }
1114
1115         host->reg_base = devm_ioremap_resource(&pdev->dev,
1116                               platform_get_resource(pdev, IORESOURCE_MEM, 0));
1117         if (IS_ERR(host->reg_base))
1118                 return PTR_ERR(host->reg_base);
1119
1120         host->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
1121         if (IS_ERR(host->clk_ahb)) {
1122                 dev_err(&pdev->dev, "Could not get ahb clock\n");
1123                 return PTR_ERR(host->clk_ahb);
1124         }
1125
1126         host->clk_mmc = devm_clk_get(&pdev->dev, "mmc");
1127         if (IS_ERR(host->clk_mmc)) {
1128                 dev_err(&pdev->dev, "Could not get mmc clock\n");
1129                 return PTR_ERR(host->clk_mmc);
1130         }
1131
1132         if (host->cfg->clk_delays) {
1133                 host->clk_output = devm_clk_get(&pdev->dev, "output");
1134                 if (IS_ERR(host->clk_output)) {
1135                         dev_err(&pdev->dev, "Could not get output clock\n");
1136                         return PTR_ERR(host->clk_output);
1137                 }
1138
1139                 host->clk_sample = devm_clk_get(&pdev->dev, "sample");
1140                 if (IS_ERR(host->clk_sample)) {
1141                         dev_err(&pdev->dev, "Could not get sample clock\n");
1142                         return PTR_ERR(host->clk_sample);
1143                 }
1144         }
1145
1146         host->reset = devm_reset_control_get_optional(&pdev->dev, "ahb");
1147         if (PTR_ERR(host->reset) == -EPROBE_DEFER)
1148                 return PTR_ERR(host->reset);
1149
1150         ret = clk_prepare_enable(host->clk_ahb);
1151         if (ret) {
1152                 dev_err(&pdev->dev, "Enable ahb clk err %d\n", ret);
1153                 return ret;
1154         }
1155
1156         ret = clk_prepare_enable(host->clk_mmc);
1157         if (ret) {
1158                 dev_err(&pdev->dev, "Enable mmc clk err %d\n", ret);
1159                 goto error_disable_clk_ahb;
1160         }
1161
1162         ret = clk_prepare_enable(host->clk_output);
1163         if (ret) {
1164                 dev_err(&pdev->dev, "Enable output clk err %d\n", ret);
1165                 goto error_disable_clk_mmc;
1166         }
1167
1168         ret = clk_prepare_enable(host->clk_sample);
1169         if (ret) {
1170                 dev_err(&pdev->dev, "Enable sample clk err %d\n", ret);
1171                 goto error_disable_clk_output;
1172         }
1173
1174         if (!IS_ERR(host->reset)) {
1175                 ret = reset_control_deassert(host->reset);
1176                 if (ret) {
1177                         dev_err(&pdev->dev, "reset err %d\n", ret);
1178                         goto error_disable_clk_sample;
1179                 }
1180         }
1181
1182         /*
1183          * Sometimes the controller asserts the irq on boot for some reason,
1184          * make sure the controller is in a sane state before enabling irqs.
1185          */
1186         ret = sunxi_mmc_reset_host(host);
1187         if (ret)
1188                 goto error_assert_reset;
1189
1190         host->irq = platform_get_irq(pdev, 0);
1191         return devm_request_threaded_irq(&pdev->dev, host->irq, sunxi_mmc_irq,
1192                         sunxi_mmc_handle_manual_stop, 0, "sunxi-mmc", host);
1193
1194 error_assert_reset:
1195         if (!IS_ERR(host->reset))
1196                 reset_control_assert(host->reset);
1197 error_disable_clk_sample:
1198         clk_disable_unprepare(host->clk_sample);
1199 error_disable_clk_output:
1200         clk_disable_unprepare(host->clk_output);
1201 error_disable_clk_mmc:
1202         clk_disable_unprepare(host->clk_mmc);
1203 error_disable_clk_ahb:
1204         clk_disable_unprepare(host->clk_ahb);
1205         return ret;
1206 }
1207
1208 static int sunxi_mmc_probe(struct platform_device *pdev)
1209 {
1210         struct sunxi_mmc_host *host;
1211         struct mmc_host *mmc;
1212         int ret;
1213
1214         mmc = mmc_alloc_host(sizeof(struct sunxi_mmc_host), &pdev->dev);
1215         if (!mmc) {
1216                 dev_err(&pdev->dev, "mmc alloc host failed\n");
1217                 return -ENOMEM;
1218         }
1219
1220         host = mmc_priv(mmc);
1221         host->mmc = mmc;
1222         spin_lock_init(&host->lock);
1223
1224         ret = sunxi_mmc_resource_request(host, pdev);
1225         if (ret)
1226                 goto error_free_host;
1227
1228         host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE,
1229                                           &host->sg_dma, GFP_KERNEL);
1230         if (!host->sg_cpu) {
1231                 dev_err(&pdev->dev, "Failed to allocate DMA descriptor mem\n");
1232                 ret = -ENOMEM;
1233                 goto error_free_host;
1234         }
1235
1236         mmc->ops                = &sunxi_mmc_ops;
1237         mmc->max_blk_count      = 8192;
1238         mmc->max_blk_size       = 4096;
1239         mmc->max_segs           = PAGE_SIZE / sizeof(struct sunxi_idma_des);
1240         mmc->max_seg_size       = (1 << host->cfg->idma_des_size_bits);
1241         mmc->max_req_size       = mmc->max_seg_size * mmc->max_segs;
1242         /* 400kHz ~ 52MHz */
1243         mmc->f_min              =   400000;
1244         mmc->f_max              = 52000000;
1245         mmc->caps              |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
1246                                   MMC_CAP_ERASE | MMC_CAP_SDIO_IRQ;
1247
1248         if (host->cfg->clk_delays)
1249                 mmc->caps      |= MMC_CAP_1_8V_DDR;
1250
1251         ret = mmc_of_parse(mmc);
1252         if (ret)
1253                 goto error_free_dma;
1254
1255         ret = mmc_add_host(mmc);
1256         if (ret)
1257                 goto error_free_dma;
1258
1259         dev_info(&pdev->dev, "base:0x%p irq:%u\n", host->reg_base, host->irq);
1260         platform_set_drvdata(pdev, mmc);
1261         return 0;
1262
1263 error_free_dma:
1264         dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
1265 error_free_host:
1266         mmc_free_host(mmc);
1267         return ret;
1268 }
1269
1270 static int sunxi_mmc_remove(struct platform_device *pdev)
1271 {
1272         struct mmc_host *mmc = platform_get_drvdata(pdev);
1273         struct sunxi_mmc_host *host = mmc_priv(mmc);
1274
1275         mmc_remove_host(mmc);
1276         disable_irq(host->irq);
1277         sunxi_mmc_reset_host(host);
1278
1279         if (!IS_ERR(host->reset))
1280                 reset_control_assert(host->reset);
1281
1282         clk_disable_unprepare(host->clk_sample);
1283         clk_disable_unprepare(host->clk_output);
1284         clk_disable_unprepare(host->clk_mmc);
1285         clk_disable_unprepare(host->clk_ahb);
1286
1287         dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
1288         mmc_free_host(mmc);
1289
1290         return 0;
1291 }
1292
1293 static struct platform_driver sunxi_mmc_driver = {
1294         .driver = {
1295                 .name   = "sunxi-mmc",
1296                 .of_match_table = of_match_ptr(sunxi_mmc_of_match),
1297         },
1298         .probe          = sunxi_mmc_probe,
1299         .remove         = sunxi_mmc_remove,
1300 };
1301 module_platform_driver(sunxi_mmc_driver);
1302
1303 MODULE_DESCRIPTION("Allwinner's SD/MMC Card Controller Driver");
1304 MODULE_LICENSE("GPL v2");
1305 MODULE_AUTHOR("David Lanzend�rfer <david.lanzendoerfer@o2s.ch>");
1306 MODULE_ALIAS("platform:sunxi-mmc");