drivers/mmc/host/davinci

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This source file includes following definitions.
mmc_davinci_sg_to_buf
davinci_fifo_data_trans
mmc_davinci_start_command
davinci_abort_dma
mmc_davinci_send_dma_request
mmc_davinci_start_dma_transfer
davinci_release_dma_channels
davinci_acquire_dma_channels
mmc_davinci_prepare_data
mmc_davinci_request
calculate_freq_for_card
calculate_clk_divider
mmc_davinci_set_ios
mmc_davinci_xfer_done
mmc_davinci_cmd_done
mmc_davinci_reset_ctrl
davinci_abort_data
mmc_davinci_sdio_irq
mmc_davinci_irq
mmc_davinci_get_cd
mmc_davinci_get_ro
mmc_davinci_enable_sdio_irq
mmc_davinci_cpufreq_transition
mmc_davinci_cpufreq_register
mmc_davinci_cpufreq_deregister
mmc_davinci_cpufreq_register
mmc_davinci_cpufreq_deregister
init_mmcsd_host
mmc_davinci_parse_pdata
davinci_mmcsd_probe
davinci_mmcsd_remove
davinci_mmcsd_suspend
davinci_mmcsd_resume
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * davinci_mmc.c - TI DaVinci MMC/SD/SDIO driver
   4  *
   5  * Copyright (C) 2006 Texas Instruments.
   6  *       Original author: Purushotam Kumar
   7  * Copyright (C) 2009 David Brownell
   8  */
   9 
  10 #include <linux/module.h>
  11 #include <linux/ioport.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/clk.h>
  14 #include <linux/err.h>
  15 #include <linux/cpufreq.h>
  16 #include <linux/mmc/host.h>
  17 #include <linux/io.h>
  18 #include <linux/irq.h>
  19 #include <linux/delay.h>
  20 #include <linux/dmaengine.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/mmc/mmc.h>
  23 #include <linux/of.h>
  24 #include <linux/of_device.h>
  25 #include <linux/mmc/slot-gpio.h>
  26 #include <linux/interrupt.h>
  27 
  28 #include <linux/platform_data/mmc-davinci.h>
  29 
  30 /*
  31  * Register Definitions
  32  */
  33 #define DAVINCI_MMCCTL       0x00 /* Control Register                  */
  34 #define DAVINCI_MMCCLK       0x04 /* Memory Clock Control Register     */
  35 #define DAVINCI_MMCST0       0x08 /* Status Register 0                 */
  36 #define DAVINCI_MMCST1       0x0C /* Status Register 1                 */
  37 #define DAVINCI_MMCIM        0x10 /* Interrupt Mask Register           */
  38 #define DAVINCI_MMCTOR       0x14 /* Response Time-Out Register        */
  39 #define DAVINCI_MMCTOD       0x18 /* Data Read Time-Out Register       */
  40 #define DAVINCI_MMCBLEN      0x1C /* Block Length Register             */
  41 #define DAVINCI_MMCNBLK      0x20 /* Number of Blocks Register         */
  42 #define DAVINCI_MMCNBLC      0x24 /* Number of Blocks Counter Register */
  43 #define DAVINCI_MMCDRR       0x28 /* Data Receive Register             */
  44 #define DAVINCI_MMCDXR       0x2C /* Data Transmit Register            */
  45 #define DAVINCI_MMCCMD       0x30 /* Command Register                  */
  46 #define DAVINCI_MMCARGHL     0x34 /* Argument Register                 */
  47 #define DAVINCI_MMCRSP01     0x38 /* Response Register 0 and 1         */
  48 #define DAVINCI_MMCRSP23     0x3C /* Response Register 0 and 1         */
  49 #define DAVINCI_MMCRSP45     0x40 /* Response Register 0 and 1         */
  50 #define DAVINCI_MMCRSP67     0x44 /* Response Register 0 and 1         */
  51 #define DAVINCI_MMCDRSP      0x48 /* Data Response Register            */
  52 #define DAVINCI_MMCETOK      0x4C
  53 #define DAVINCI_MMCCIDX      0x50 /* Command Index Register            */
  54 #define DAVINCI_MMCCKC       0x54
  55 #define DAVINCI_MMCTORC      0x58
  56 #define DAVINCI_MMCTODC      0x5C
  57 #define DAVINCI_MMCBLNC      0x60
  58 #define DAVINCI_SDIOCTL      0x64
  59 #define DAVINCI_SDIOST0      0x68
  60 #define DAVINCI_SDIOIEN      0x6C
  61 #define DAVINCI_SDIOIST      0x70
  62 #define DAVINCI_MMCFIFOCTL   0x74 /* FIFO Control Register             */
  63 
  64 /* DAVINCI_MMCCTL definitions */
  65 #define MMCCTL_DATRST         (1 << 0)
  66 #define MMCCTL_CMDRST         (1 << 1)
  67 #define MMCCTL_WIDTH_8_BIT    (1 << 8)
  68 #define MMCCTL_WIDTH_4_BIT    (1 << 2)
  69 #define MMCCTL_DATEG_DISABLED (0 << 6)
  70 #define MMCCTL_DATEG_RISING   (1 << 6)
  71 #define MMCCTL_DATEG_FALLING  (2 << 6)
  72 #define MMCCTL_DATEG_BOTH     (3 << 6)
  73 #define MMCCTL_PERMDR_LE      (0 << 9)
  74 #define MMCCTL_PERMDR_BE      (1 << 9)
  75 #define MMCCTL_PERMDX_LE      (0 << 10)
  76 #define MMCCTL_PERMDX_BE      (1 << 10)
  77 
  78 /* DAVINCI_MMCCLK definitions */
  79 #define MMCCLK_CLKEN          (1 << 8)
  80 #define MMCCLK_CLKRT_MASK     (0xFF << 0)
  81 
  82 /* IRQ bit definitions, for DAVINCI_MMCST0 and DAVINCI_MMCIM */
  83 #define MMCST0_DATDNE         BIT(0)    /* data done */
  84 #define MMCST0_BSYDNE         BIT(1)    /* busy done */
  85 #define MMCST0_RSPDNE         BIT(2)    /* command done */
  86 #define MMCST0_TOUTRD         BIT(3)    /* data read timeout */
  87 #define MMCST0_TOUTRS         BIT(4)    /* command response timeout */
  88 #define MMCST0_CRCWR          BIT(5)    /* data write CRC error */
  89 #define MMCST0_CRCRD          BIT(6)    /* data read CRC error */
  90 #define MMCST0_CRCRS          BIT(7)    /* command response CRC error */
  91 #define MMCST0_DXRDY          BIT(9)    /* data transmit ready (fifo empty) */
  92 #define MMCST0_DRRDY          BIT(10)   /* data receive ready (data in fifo)*/
  93 #define MMCST0_DATED          BIT(11)   /* DAT3 edge detect */
  94 #define MMCST0_TRNDNE         BIT(12)   /* transfer done */
  95 
  96 /* DAVINCI_MMCST1 definitions */
  97 #define MMCST1_BUSY           (1 << 0)
  98 
  99 /* DAVINCI_MMCCMD definitions */
 100 #define MMCCMD_CMD_MASK       (0x3F << 0)
 101 #define MMCCMD_PPLEN          (1 << 7)
 102 #define MMCCMD_BSYEXP         (1 << 8)
 103 #define MMCCMD_RSPFMT_MASK    (3 << 9)
 104 #define MMCCMD_RSPFMT_NONE    (0 << 9)
 105 #define MMCCMD_RSPFMT_R1456   (1 << 9)
 106 #define MMCCMD_RSPFMT_R2      (2 << 9)
 107 #define MMCCMD_RSPFMT_R3      (3 << 9)
 108 #define MMCCMD_DTRW           (1 << 11)
 109 #define MMCCMD_STRMTP         (1 << 12)
 110 #define MMCCMD_WDATX          (1 << 13)
 111 #define MMCCMD_INITCK         (1 << 14)
 112 #define MMCCMD_DCLR           (1 << 15)
 113 #define MMCCMD_DMATRIG        (1 << 16)
 114 
 115 /* DAVINCI_MMCFIFOCTL definitions */
 116 #define MMCFIFOCTL_FIFORST    (1 << 0)
 117 #define MMCFIFOCTL_FIFODIR_WR (1 << 1)
 118 #define MMCFIFOCTL_FIFODIR_RD (0 << 1)
 119 #define MMCFIFOCTL_FIFOLEV    (1 << 2) /* 0 = 128 bits, 1 = 256 bits */
 120 #define MMCFIFOCTL_ACCWD_4    (0 << 3) /* access width of 4 bytes    */
 121 #define MMCFIFOCTL_ACCWD_3    (1 << 3) /* access width of 3 bytes    */
 122 #define MMCFIFOCTL_ACCWD_2    (2 << 3) /* access width of 2 bytes    */
 123 #define MMCFIFOCTL_ACCWD_1    (3 << 3) /* access width of 1 byte     */
 124 
 125 /* DAVINCI_SDIOST0 definitions */
 126 #define SDIOST0_DAT1_HI       BIT(0)
 127 
 128 /* DAVINCI_SDIOIEN definitions */
 129 #define SDIOIEN_IOINTEN       BIT(0)
 130 
 131 /* DAVINCI_SDIOIST definitions */
 132 #define SDIOIST_IOINT         BIT(0)
 133 
 134 /* MMCSD Init clock in Hz in opendrain mode */
 135 #define MMCSD_INIT_CLOCK                200000
 136 
 137 /*
 138  * One scatterlist dma "segment" is at most MAX_CCNT rw_threshold units,
 139  * and we handle up to MAX_NR_SG segments.  MMC_BLOCK_BOUNCE kicks in only
 140  * for drivers with max_segs == 1, making the segments bigger (64KB)
 141  * than the page or two that's otherwise typical. nr_sg (passed from
 142  * platform data) == 16 gives at least the same throughput boost, using
 143  * EDMA transfer linkage instead of spending CPU time copying pages.
 144  */
 145 #define MAX_CCNT        ((1 << 16) - 1)
 146 
 147 #define MAX_NR_SG       16
 148 
 149 static unsigned rw_threshold = 32;
 150 module_param(rw_threshold, uint, S_IRUGO);
 151 MODULE_PARM_DESC(rw_threshold,
 152                 "Read/Write threshold. Default = 32");
 153 
 154 static unsigned poll_threshold = 128;
 155 module_param(poll_threshold, uint, S_IRUGO);
 156 MODULE_PARM_DESC(poll_threshold,
 157                  "Polling transaction size threshold. Default = 128");
 158 
 159 static unsigned poll_loopcount = 32;
 160 module_param(poll_loopcount, uint, S_IRUGO);
 161 MODULE_PARM_DESC(poll_loopcount,
 162                  "Maximum polling loop count. Default = 32");
 163 
 164 static unsigned use_dma = 1;
 165 module_param(use_dma, uint, 0);
 166 MODULE_PARM_DESC(use_dma, "Whether to use DMA or not. Default = 1");
 167 
 168 struct mmc_davinci_host {
 169         struct mmc_command *cmd;
 170         struct mmc_data *data;
 171         struct mmc_host *mmc;
 172         struct clk *clk;
 173         unsigned int mmc_input_clk;
 174         void __iomem *base;
 175         struct resource *mem_res;
 176         int mmc_irq, sdio_irq;
 177         unsigned char bus_mode;
 178 
 179 #define DAVINCI_MMC_DATADIR_NONE        0
 180 #define DAVINCI_MMC_DATADIR_READ        1
 181 #define DAVINCI_MMC_DATADIR_WRITE       2
 182         unsigned char data_dir;
 183 
 184         /* buffer is used during PIO of one scatterlist segment, and
 185          * is updated along with buffer_bytes_left.  bytes_left applies
 186          * to all N blocks of the PIO transfer.
 187          */
 188         u8 *buffer;
 189         u32 buffer_bytes_left;
 190         u32 bytes_left;
 191 
 192         struct dma_chan *dma_tx;
 193         struct dma_chan *dma_rx;
 194         bool use_dma;
 195         bool do_dma;
 196         bool sdio_int;
 197         bool active_request;
 198 
 199         /* For PIO we walk scatterlists one segment at a time. */
 200         unsigned int            sg_len;
 201         struct scatterlist *sg;
 202 
 203         /* Version of the MMC/SD controller */
 204         u8 version;
 205         /* for ns in one cycle calculation */
 206         unsigned ns_in_one_cycle;
 207         /* Number of sg segments */
 208         u8 nr_sg;
 209 #ifdef CONFIG_CPU_FREQ
 210         struct notifier_block   freq_transition;
 211 #endif
 212 };
 213 
 214 static irqreturn_t mmc_davinci_irq(int irq, void *dev_id);
 215 
 216 /* PIO only */
 217 static void mmc_davinci_sg_to_buf(struct mmc_davinci_host *host)
 218 {
 219         host->buffer_bytes_left = sg_dma_len(host->sg);
 220         host->buffer = sg_virt(host->sg);
 221         if (host->buffer_bytes_left > host->bytes_left)
 222                 host->buffer_bytes_left = host->bytes_left;
 223 }
 224 
 225 static void davinci_fifo_data_trans(struct mmc_davinci_host *host,
 226                                         unsigned int n)
 227 {
 228         u8 *p;
 229         unsigned int i;
 230 
 231         if (host->buffer_bytes_left == 0) {
 232                 host->sg = sg_next(host->data->sg);
 233                 mmc_davinci_sg_to_buf(host);
 234         }
 235 
 236         p = host->buffer;
 237         if (n > host->buffer_bytes_left)
 238                 n = host->buffer_bytes_left;
 239         host->buffer_bytes_left -= n;
 240         host->bytes_left -= n;
 241 
 242         /* NOTE:  we never transfer more than rw_threshold bytes
 243          * to/from the fifo here; there's no I/O overlap.
 244          * This also assumes that access width( i.e. ACCWD) is 4 bytes
 245          */
 246         if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
 247                 for (i = 0; i < (n >> 2); i++) {
 248                         writel(*((u32 *)p), host->base + DAVINCI_MMCDXR);
 249                         p = p + 4;
 250                 }
 251                 if (n & 3) {
 252                         iowrite8_rep(host->base + DAVINCI_MMCDXR, p, (n & 3));
 253                         p = p + (n & 3);
 254                 }
 255         } else {
 256                 for (i = 0; i < (n >> 2); i++) {
 257                         *((u32 *)p) = readl(host->base + DAVINCI_MMCDRR);
 258                         p  = p + 4;
 259                 }
 260                 if (n & 3) {
 261                         ioread8_rep(host->base + DAVINCI_MMCDRR, p, (n & 3));
 262                         p = p + (n & 3);
 263                 }
 264         }
 265         host->buffer = p;
 266 }
 267 
 268 static void mmc_davinci_start_command(struct mmc_davinci_host *host,
 269                 struct mmc_command *cmd)
 270 {
 271         u32 cmd_reg = 0;
 272         u32 im_val;
 273 
 274         dev_dbg(mmc_dev(host->mmc), "CMD%d, arg 0x%08x%s\n",
 275                 cmd->opcode, cmd->arg,
 276                 ({ char *s;
 277                 switch (mmc_resp_type(cmd)) {
 278                 case MMC_RSP_R1:
 279                         s = ", R1/R5/R6/R7 response";
 280                         break;
 281                 case MMC_RSP_R1B:
 282                         s = ", R1b response";
 283                         break;
 284                 case MMC_RSP_R2:
 285                         s = ", R2 response";
 286                         break;
 287                 case MMC_RSP_R3:
 288                         s = ", R3/R4 response";
 289                         break;
 290                 default:
 291                         s = ", (R? response)";
 292                         break;
 293                 }; s; }));
 294         host->cmd = cmd;
 295 
 296         switch (mmc_resp_type(cmd)) {
 297         case MMC_RSP_R1B:
 298                 /* There's some spec confusion about when R1B is
 299                  * allowed, but if the card doesn't issue a BUSY
 300                  * then it's harmless for us to allow it.
 301                  */
 302                 cmd_reg |= MMCCMD_BSYEXP;
 303                 /* FALLTHROUGH */
 304         case MMC_RSP_R1:                /* 48 bits, CRC */
 305                 cmd_reg |= MMCCMD_RSPFMT_R1456;
 306                 break;
 307         case MMC_RSP_R2:                /* 136 bits, CRC */
 308                 cmd_reg |= MMCCMD_RSPFMT_R2;
 309                 break;
 310         case MMC_RSP_R3:                /* 48 bits, no CRC */
 311                 cmd_reg |= MMCCMD_RSPFMT_R3;
 312                 break;
 313         default:
 314                 cmd_reg |= MMCCMD_RSPFMT_NONE;
 315                 dev_dbg(mmc_dev(host->mmc), "unknown resp_type %04x\n",
 316                         mmc_resp_type(cmd));
 317                 break;
 318         }
 319 
 320         /* Set command index */
 321         cmd_reg |= cmd->opcode;
 322 
 323         /* Enable EDMA transfer triggers */
 324         if (host->do_dma)
 325                 cmd_reg |= MMCCMD_DMATRIG;
 326 
 327         if (host->version == MMC_CTLR_VERSION_2 && host->data != NULL &&
 328                         host->data_dir == DAVINCI_MMC_DATADIR_READ)
 329                 cmd_reg |= MMCCMD_DMATRIG;
 330 
 331         /* Setting whether command involves data transfer or not */
 332         if (cmd->data)
 333                 cmd_reg |= MMCCMD_WDATX;
 334 
 335         /* Setting whether data read or write */
 336         if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE)
 337                 cmd_reg |= MMCCMD_DTRW;
 338 
 339         if (host->bus_mode == MMC_BUSMODE_PUSHPULL)
 340                 cmd_reg |= MMCCMD_PPLEN;
 341 
 342         /* set Command timeout */
 343         writel(0x1FFF, host->base + DAVINCI_MMCTOR);
 344 
 345         /* Enable interrupt (calculate here, defer until FIFO is stuffed). */
 346         im_val =  MMCST0_RSPDNE | MMCST0_CRCRS | MMCST0_TOUTRS;
 347         if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
 348                 im_val |= MMCST0_DATDNE | MMCST0_CRCWR;
 349 
 350                 if (!host->do_dma)
 351                         im_val |= MMCST0_DXRDY;
 352         } else if (host->data_dir == DAVINCI_MMC_DATADIR_READ) {
 353                 im_val |= MMCST0_DATDNE | MMCST0_CRCRD | MMCST0_TOUTRD;
 354 
 355                 if (!host->do_dma)
 356                         im_val |= MMCST0_DRRDY;
 357         }
 358 
 359         /*
 360          * Before non-DMA WRITE commands the controller needs priming:
 361          * FIFO should be populated with 32 bytes i.e. whatever is the FIFO size
 362          */
 363         if (!host->do_dma && (host->data_dir == DAVINCI_MMC_DATADIR_WRITE))
 364                 davinci_fifo_data_trans(host, rw_threshold);
 365 
 366         writel(cmd->arg, host->base + DAVINCI_MMCARGHL);
 367         writel(cmd_reg,  host->base + DAVINCI_MMCCMD);
 368 
 369         host->active_request = true;
 370 
 371         if (!host->do_dma && host->bytes_left <= poll_threshold) {
 372                 u32 count = poll_loopcount;
 373 
 374                 while (host->active_request && count--) {
 375                         mmc_davinci_irq(0, host);
 376                         cpu_relax();
 377                 }
 378         }
 379 
 380         if (host->active_request)
 381                 writel(im_val, host->base + DAVINCI_MMCIM);
 382 }
 383 
 384 /*----------------------------------------------------------------------*/
 385 
 386 /* DMA infrastructure */
 387 
 388 static void davinci_abort_dma(struct mmc_davinci_host *host)
 389 {
 390         struct dma_chan *sync_dev;
 391 
 392         if (host->data_dir == DAVINCI_MMC_DATADIR_READ)
 393                 sync_dev = host->dma_rx;
 394         else
 395                 sync_dev = host->dma_tx;
 396 
 397         dmaengine_terminate_all(sync_dev);
 398 }
 399 
 400 static int mmc_davinci_send_dma_request(struct mmc_davinci_host *host,
 401                 struct mmc_data *data)
 402 {
 403         struct dma_chan *chan;
 404         struct dma_async_tx_descriptor *desc;
 405         int ret = 0;
 406 
 407         if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
 408                 struct dma_slave_config dma_tx_conf = {
 409                         .direction = DMA_MEM_TO_DEV,
 410                         .dst_addr = host->mem_res->start + DAVINCI_MMCDXR,
 411                         .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
 412                         .dst_maxburst =
 413                                 rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES,
 414                 };
 415                 chan = host->dma_tx;
 416                 dmaengine_slave_config(host->dma_tx, &dma_tx_conf);
 417 
 418                 desc = dmaengine_prep_slave_sg(host->dma_tx,
 419                                 data->sg,
 420                                 host->sg_len,
 421                                 DMA_MEM_TO_DEV,
 422                                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 423                 if (!desc) {
 424                         dev_dbg(mmc_dev(host->mmc),
 425                                 "failed to allocate DMA TX descriptor");
 426                         ret = -1;
 427                         goto out;
 428                 }
 429         } else {
 430                 struct dma_slave_config dma_rx_conf = {
 431                         .direction = DMA_DEV_TO_MEM,
 432                         .src_addr = host->mem_res->start + DAVINCI_MMCDRR,
 433                         .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
 434                         .src_maxburst =
 435                                 rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES,
 436                 };
 437                 chan = host->dma_rx;
 438                 dmaengine_slave_config(host->dma_rx, &dma_rx_conf);
 439 
 440                 desc = dmaengine_prep_slave_sg(host->dma_rx,
 441                                 data->sg,
 442                                 host->sg_len,
 443                                 DMA_DEV_TO_MEM,
 444                                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 445                 if (!desc) {
 446                         dev_dbg(mmc_dev(host->mmc),
 447                                 "failed to allocate DMA RX descriptor");
 448                         ret = -1;
 449                         goto out;
 450                 }
 451         }
 452 
 453         dmaengine_submit(desc);
 454         dma_async_issue_pending(chan);
 455 
 456 out:
 457         return ret;
 458 }
 459 
 460 static int mmc_davinci_start_dma_transfer(struct mmc_davinci_host *host,
 461                 struct mmc_data *data)
 462 {
 463         int i;
 464         int mask = rw_threshold - 1;
 465         int ret = 0;
 466 
 467         host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 468                                   mmc_get_dma_dir(data));
 469 
 470         /* no individual DMA segment should need a partial FIFO */
 471         for (i = 0; i < host->sg_len; i++) {
 472                 if (sg_dma_len(data->sg + i) & mask) {
 473                         dma_unmap_sg(mmc_dev(host->mmc),
 474                                      data->sg, data->sg_len,
 475                                      mmc_get_dma_dir(data));
 476                         return -1;
 477                 }
 478         }
 479 
 480         host->do_dma = 1;
 481         ret = mmc_davinci_send_dma_request(host, data);
 482 
 483         return ret;
 484 }
 485 
 486 static void davinci_release_dma_channels(struct mmc_davinci_host *host)
 487 {
 488         if (!host->use_dma)
 489                 return;
 490 
 491         dma_release_channel(host->dma_tx);
 492         dma_release_channel(host->dma_rx);
 493 }
 494 
 495 static int davinci_acquire_dma_channels(struct mmc_davinci_host *host)
 496 {
 497         host->dma_tx = dma_request_chan(mmc_dev(host->mmc), "tx");
 498         if (IS_ERR(host->dma_tx)) {
 499                 dev_err(mmc_dev(host->mmc), "Can't get dma_tx channel\n");
 500                 return PTR_ERR(host->dma_tx);
 501         }
 502 
 503         host->dma_rx = dma_request_chan(mmc_dev(host->mmc), "rx");
 504         if (IS_ERR(host->dma_rx)) {
 505                 dev_err(mmc_dev(host->mmc), "Can't get dma_rx channel\n");
 506                 dma_release_channel(host->dma_tx);
 507                 return PTR_ERR(host->dma_rx);
 508         }
 509 
 510         return 0;
 511 }
 512 
 513 /*----------------------------------------------------------------------*/
 514 
 515 static void
 516 mmc_davinci_prepare_data(struct mmc_davinci_host *host, struct mmc_request *req)
 517 {
 518         int fifo_lev = (rw_threshold == 32) ? MMCFIFOCTL_FIFOLEV : 0;
 519         int timeout;
 520         struct mmc_data *data = req->data;
 521 
 522         if (host->version == MMC_CTLR_VERSION_2)
 523                 fifo_lev = (rw_threshold == 64) ? MMCFIFOCTL_FIFOLEV : 0;
 524 
 525         host->data = data;
 526         if (data == NULL) {
 527                 host->data_dir = DAVINCI_MMC_DATADIR_NONE;
 528                 writel(0, host->base + DAVINCI_MMCBLEN);
 529                 writel(0, host->base + DAVINCI_MMCNBLK);
 530                 return;
 531         }
 532 
 533         dev_dbg(mmc_dev(host->mmc), "%s, %d blocks of %d bytes\n",
 534                 (data->flags & MMC_DATA_WRITE) ? "write" : "read",
 535                 data->blocks, data->blksz);
 536         dev_dbg(mmc_dev(host->mmc), "  DTO %d cycles + %d ns\n",
 537                 data->timeout_clks, data->timeout_ns);
 538         timeout = data->timeout_clks +
 539                 (data->timeout_ns / host->ns_in_one_cycle);
 540         if (timeout > 0xffff)
 541                 timeout = 0xffff;
 542 
 543         writel(timeout, host->base + DAVINCI_MMCTOD);
 544         writel(data->blocks, host->base + DAVINCI_MMCNBLK);
 545         writel(data->blksz, host->base + DAVINCI_MMCBLEN);
 546 
 547         /* Configure the FIFO */
 548         if (data->flags & MMC_DATA_WRITE) {
 549                 host->data_dir = DAVINCI_MMC_DATADIR_WRITE;
 550                 writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR | MMCFIFOCTL_FIFORST,
 551                         host->base + DAVINCI_MMCFIFOCTL);
 552                 writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR,
 553                         host->base + DAVINCI_MMCFIFOCTL);
 554         } else {
 555                 host->data_dir = DAVINCI_MMC_DATADIR_READ;
 556                 writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD | MMCFIFOCTL_FIFORST,
 557                         host->base + DAVINCI_MMCFIFOCTL);
 558                 writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD,
 559                         host->base + DAVINCI_MMCFIFOCTL);
 560         }
 561 
 562         host->buffer = NULL;
 563         host->bytes_left = data->blocks * data->blksz;
 564 
 565         /* For now we try to use DMA whenever we won't need partial FIFO
 566          * reads or writes, either for the whole transfer (as tested here)
 567          * or for any individual scatterlist segment (tested when we call
 568          * start_dma_transfer).
 569          *
 570          * While we *could* change that, unusual block sizes are rarely
 571          * used.  The occasional fallback to PIO should't hurt.
 572          */
 573         if (host->use_dma && (host->bytes_left & (rw_threshold - 1)) == 0
 574                         && mmc_davinci_start_dma_transfer(host, data) == 0) {
 575                 /* zero this to ensure we take no PIO paths */
 576                 host->bytes_left = 0;
 577         } else {
 578                 /* Revert to CPU Copy */
 579                 host->sg_len = data->sg_len;
 580                 host->sg = host->data->sg;
 581                 mmc_davinci_sg_to_buf(host);
 582         }
 583 }
 584 
 585 static void mmc_davinci_request(struct mmc_host *mmc, struct mmc_request *req)
 586 {
 587         struct mmc_davinci_host *host = mmc_priv(mmc);
 588         unsigned long timeout = jiffies + msecs_to_jiffies(900);
 589         u32 mmcst1 = 0;
 590 
 591         /* Card may still be sending BUSY after a previous operation,
 592          * typically some kind of write.  If so, we can't proceed yet.
 593          */
 594         while (time_before(jiffies, timeout)) {
 595                 mmcst1  = readl(host->base + DAVINCI_MMCST1);
 596                 if (!(mmcst1 & MMCST1_BUSY))
 597                         break;
 598                 cpu_relax();
 599         }
 600         if (mmcst1 & MMCST1_BUSY) {
 601                 dev_err(mmc_dev(host->mmc), "still BUSY? bad ... \n");
 602                 req->cmd->error = -ETIMEDOUT;
 603                 mmc_request_done(mmc, req);
 604                 return;
 605         }
 606 
 607         host->do_dma = 0;
 608         mmc_davinci_prepare_data(host, req);
 609         mmc_davinci_start_command(host, req->cmd);
 610 }
 611 
 612 static unsigned int calculate_freq_for_card(struct mmc_davinci_host *host,
 613         unsigned int mmc_req_freq)
 614 {
 615         unsigned int mmc_freq = 0, mmc_pclk = 0, mmc_push_pull_divisor = 0;
 616 
 617         mmc_pclk = host->mmc_input_clk;
 618         if (mmc_req_freq && mmc_pclk > (2 * mmc_req_freq))
 619                 mmc_push_pull_divisor = ((unsigned int)mmc_pclk
 620                                 / (2 * mmc_req_freq)) - 1;
 621         else
 622                 mmc_push_pull_divisor = 0;
 623 
 624         mmc_freq = (unsigned int)mmc_pclk
 625                 / (2 * (mmc_push_pull_divisor + 1));
 626 
 627         if (mmc_freq > mmc_req_freq)
 628                 mmc_push_pull_divisor = mmc_push_pull_divisor + 1;
 629         /* Convert ns to clock cycles */
 630         if (mmc_req_freq <= 400000)
 631                 host->ns_in_one_cycle = (1000000) / (((mmc_pclk
 632                                 / (2 * (mmc_push_pull_divisor + 1)))/1000));
 633         else
 634                 host->ns_in_one_cycle = (1000000) / (((mmc_pclk
 635                                 / (2 * (mmc_push_pull_divisor + 1)))/1000000));
 636 
 637         return mmc_push_pull_divisor;
 638 }
 639 
 640 static void calculate_clk_divider(struct mmc_host *mmc, struct mmc_ios *ios)
 641 {
 642         unsigned int open_drain_freq = 0, mmc_pclk = 0;
 643         unsigned int mmc_push_pull_freq = 0;
 644         struct mmc_davinci_host *host = mmc_priv(mmc);
 645 
 646         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
 647                 u32 temp;
 648 
 649                 /* Ignoring the init clock value passed for fixing the inter
 650                  * operability with different cards.
 651                  */
 652                 open_drain_freq = ((unsigned int)mmc_pclk
 653                                 / (2 * MMCSD_INIT_CLOCK)) - 1;
 654 
 655                 if (open_drain_freq > 0xFF)
 656                         open_drain_freq = 0xFF;
 657 
 658                 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
 659                 temp |= open_drain_freq;
 660                 writel(temp, host->base + DAVINCI_MMCCLK);
 661 
 662                 /* Convert ns to clock cycles */
 663                 host->ns_in_one_cycle = (1000000) / (MMCSD_INIT_CLOCK/1000);
 664         } else {
 665                 u32 temp;
 666                 mmc_push_pull_freq = calculate_freq_for_card(host, ios->clock);
 667 
 668                 if (mmc_push_pull_freq > 0xFF)
 669                         mmc_push_pull_freq = 0xFF;
 670 
 671                 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKEN;
 672                 writel(temp, host->base + DAVINCI_MMCCLK);
 673 
 674                 udelay(10);
 675 
 676                 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
 677                 temp |= mmc_push_pull_freq;
 678                 writel(temp, host->base + DAVINCI_MMCCLK);
 679 
 680                 writel(temp | MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
 681 
 682                 udelay(10);
 683         }
 684 }
 685 
 686 static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 687 {
 688         struct mmc_davinci_host *host = mmc_priv(mmc);
 689         struct platform_device *pdev = to_platform_device(mmc->parent);
 690         struct davinci_mmc_config *config = pdev->dev.platform_data;
 691 
 692         dev_dbg(mmc_dev(host->mmc),
 693                 "clock %dHz busmode %d powermode %d Vdd %04x\n",
 694                 ios->clock, ios->bus_mode, ios->power_mode,
 695                 ios->vdd);
 696 
 697         switch (ios->power_mode) {
 698         case MMC_POWER_OFF:
 699                 if (config && config->set_power)
 700                         config->set_power(pdev->id, false);
 701                 break;
 702         case MMC_POWER_UP:
 703                 if (config && config->set_power)
 704                         config->set_power(pdev->id, true);
 705                 break;
 706         }
 707 
 708         switch (ios->bus_width) {
 709         case MMC_BUS_WIDTH_8:
 710                 dev_dbg(mmc_dev(host->mmc), "Enabling 8 bit mode\n");
 711                 writel((readl(host->base + DAVINCI_MMCCTL) &
 712                         ~MMCCTL_WIDTH_4_BIT) | MMCCTL_WIDTH_8_BIT,
 713                         host->base + DAVINCI_MMCCTL);
 714                 break;
 715         case MMC_BUS_WIDTH_4:
 716                 dev_dbg(mmc_dev(host->mmc), "Enabling 4 bit mode\n");
 717                 if (host->version == MMC_CTLR_VERSION_2)
 718                         writel((readl(host->base + DAVINCI_MMCCTL) &
 719                                 ~MMCCTL_WIDTH_8_BIT) | MMCCTL_WIDTH_4_BIT,
 720                                 host->base + DAVINCI_MMCCTL);
 721                 else
 722                         writel(readl(host->base + DAVINCI_MMCCTL) |
 723                                 MMCCTL_WIDTH_4_BIT,
 724                                 host->base + DAVINCI_MMCCTL);
 725                 break;
 726         case MMC_BUS_WIDTH_1:
 727                 dev_dbg(mmc_dev(host->mmc), "Enabling 1 bit mode\n");
 728                 if (host->version == MMC_CTLR_VERSION_2)
 729                         writel(readl(host->base + DAVINCI_MMCCTL) &
 730                                 ~(MMCCTL_WIDTH_8_BIT | MMCCTL_WIDTH_4_BIT),
 731                                 host->base + DAVINCI_MMCCTL);
 732                 else
 733                         writel(readl(host->base + DAVINCI_MMCCTL) &
 734                                 ~MMCCTL_WIDTH_4_BIT,
 735                                 host->base + DAVINCI_MMCCTL);
 736                 break;
 737         }
 738 
 739         calculate_clk_divider(mmc, ios);
 740 
 741         host->bus_mode = ios->bus_mode;
 742         if (ios->power_mode == MMC_POWER_UP) {
 743                 unsigned long timeout = jiffies + msecs_to_jiffies(50);
 744                 bool lose = true;
 745 
 746                 /* Send clock cycles, poll completion */
 747                 writel(0, host->base + DAVINCI_MMCARGHL);
 748                 writel(MMCCMD_INITCK, host->base + DAVINCI_MMCCMD);
 749                 while (time_before(jiffies, timeout)) {
 750                         u32 tmp = readl(host->base + DAVINCI_MMCST0);
 751 
 752                         if (tmp & MMCST0_RSPDNE) {
 753                                 lose = false;
 754                                 break;
 755                         }
 756                         cpu_relax();
 757                 }
 758                 if (lose)
 759                         dev_warn(mmc_dev(host->mmc), "powerup timeout\n");
 760         }
 761 
 762         /* FIXME on power OFF, reset things ... */
 763 }
 764 
 765 static void
 766 mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data *data)
 767 {
 768         host->data = NULL;
 769 
 770         if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
 771                 /*
 772                  * SDIO Interrupt Detection work-around as suggested by
 773                  * Davinci Errata (TMS320DM355 Silicon Revision 1.1 Errata
 774                  * 2.1.6): Signal SDIO interrupt only if it is enabled by core
 775                  */
 776                 if (host->sdio_int && !(readl(host->base + DAVINCI_SDIOST0) &
 777                                         SDIOST0_DAT1_HI)) {
 778                         writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
 779                         mmc_signal_sdio_irq(host->mmc);
 780                 }
 781         }
 782 
 783         if (host->do_dma) {
 784                 davinci_abort_dma(host);
 785 
 786                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 787                              mmc_get_dma_dir(data));
 788                 host->do_dma = false;
 789         }
 790         host->data_dir = DAVINCI_MMC_DATADIR_NONE;
 791 
 792         if (!data->stop || (host->cmd && host->cmd->error)) {
 793                 mmc_request_done(host->mmc, data->mrq);
 794                 writel(0, host->base + DAVINCI_MMCIM);
 795                 host->active_request = false;
 796         } else
 797                 mmc_davinci_start_command(host, data->stop);
 798 }
 799 
 800 static void mmc_davinci_cmd_done(struct mmc_davinci_host *host,
 801                                  struct mmc_command *cmd)
 802 {
 803         host->cmd = NULL;
 804 
 805         if (cmd->flags & MMC_RSP_PRESENT) {
 806                 if (cmd->flags & MMC_RSP_136) {
 807                         /* response type 2 */
 808                         cmd->resp[3] = readl(host->base + DAVINCI_MMCRSP01);
 809                         cmd->resp[2] = readl(host->base + DAVINCI_MMCRSP23);
 810                         cmd->resp[1] = readl(host->base + DAVINCI_MMCRSP45);
 811                         cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
 812                 } else {
 813                         /* response types 1, 1b, 3, 4, 5, 6 */
 814                         cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
 815                 }
 816         }
 817 
 818         if (host->data == NULL || cmd->error) {
 819                 if (cmd->error == -ETIMEDOUT)
 820                         cmd->mrq->cmd->retries = 0;
 821                 mmc_request_done(host->mmc, cmd->mrq);
 822                 writel(0, host->base + DAVINCI_MMCIM);
 823                 host->active_request = false;
 824         }
 825 }
 826 
 827 static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host,
 828                                                                 int val)
 829 {
 830         u32 temp;
 831 
 832         temp = readl(host->base + DAVINCI_MMCCTL);
 833         if (val)        /* reset */
 834                 temp |= MMCCTL_CMDRST | MMCCTL_DATRST;
 835         else            /* enable */
 836                 temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
 837 
 838         writel(temp, host->base + DAVINCI_MMCCTL);
 839         udelay(10);
 840 }
 841 
 842 static void
 843 davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
 844 {
 845         mmc_davinci_reset_ctrl(host, 1);
 846         mmc_davinci_reset_ctrl(host, 0);
 847 }
 848 
 849 static irqreturn_t mmc_davinci_sdio_irq(int irq, void *dev_id)
 850 {
 851         struct mmc_davinci_host *host = dev_id;
 852         unsigned int status;
 853 
 854         status = readl(host->base + DAVINCI_SDIOIST);
 855         if (status & SDIOIST_IOINT) {
 856                 dev_dbg(mmc_dev(host->mmc),
 857                         "SDIO interrupt status %x\n", status);
 858                 writel(status | SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
 859                 mmc_signal_sdio_irq(host->mmc);
 860         }
 861         return IRQ_HANDLED;
 862 }
 863 
 864 static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
 865 {
 866         struct mmc_davinci_host *host = (struct mmc_davinci_host *)dev_id;
 867         unsigned int status, qstatus;
 868         int end_command = 0;
 869         int end_transfer = 0;
 870         struct mmc_data *data = host->data;
 871 
 872         if (host->cmd == NULL && host->data == NULL) {
 873                 status = readl(host->base + DAVINCI_MMCST0);
 874                 dev_dbg(mmc_dev(host->mmc),
 875                         "Spurious interrupt 0x%04x\n", status);
 876                 /* Disable the interrupt from mmcsd */
 877                 writel(0, host->base + DAVINCI_MMCIM);
 878                 return IRQ_NONE;
 879         }
 880 
 881         status = readl(host->base + DAVINCI_MMCST0);
 882         qstatus = status;
 883 
 884         /* handle FIFO first when using PIO for data.
 885          * bytes_left will decrease to zero as I/O progress and status will
 886          * read zero over iteration because this controller status
 887          * register(MMCST0) reports any status only once and it is cleared
 888          * by read. So, it is not unbouned loop even in the case of
 889          * non-dma.
 890          */
 891         if (host->bytes_left && (status & (MMCST0_DXRDY | MMCST0_DRRDY))) {
 892                 unsigned long im_val;
 893 
 894                 /*
 895                  * If interrupts fire during the following loop, they will be
 896                  * handled by the handler, but the PIC will still buffer these.
 897                  * As a result, the handler will be called again to serve these
 898                  * needlessly. In order to avoid these spurious interrupts,
 899                  * keep interrupts masked during the loop.
 900                  */
 901                 im_val = readl(host->base + DAVINCI_MMCIM);
 902                 writel(0, host->base + DAVINCI_MMCIM);
 903 
 904                 do {
 905                         davinci_fifo_data_trans(host, rw_threshold);
 906                         status = readl(host->base + DAVINCI_MMCST0);
 907                         qstatus |= status;
 908                 } while (host->bytes_left &&
 909                          (status & (MMCST0_DXRDY | MMCST0_DRRDY)));
 910 
 911                 /*
 912                  * If an interrupt is pending, it is assumed it will fire when
 913                  * it is unmasked. This assumption is also taken when the MMCIM
 914                  * is first set. Otherwise, writing to MMCIM after reading the
 915                  * status is race-prone.
 916                  */
 917                 writel(im_val, host->base + DAVINCI_MMCIM);
 918         }
 919 
 920         if (qstatus & MMCST0_DATDNE) {
 921                 /* All blocks sent/received, and CRC checks passed */
 922                 if (data != NULL) {
 923                         if ((host->do_dma == 0) && (host->bytes_left > 0)) {
 924                                 /* if datasize < rw_threshold
 925                                  * no RX ints are generated
 926                                  */
 927                                 davinci_fifo_data_trans(host, host->bytes_left);
 928                         }
 929                         end_transfer = 1;
 930                         data->bytes_xfered = data->blocks * data->blksz;
 931                 } else {
 932                         dev_err(mmc_dev(host->mmc),
 933                                         "DATDNE with no host->data\n");
 934                 }
 935         }
 936 
 937         if (qstatus & MMCST0_TOUTRD) {
 938                 /* Read data timeout */
 939                 data->error = -ETIMEDOUT;
 940                 end_transfer = 1;
 941 
 942                 dev_dbg(mmc_dev(host->mmc),
 943                         "read data timeout, status %x\n",
 944                         qstatus);
 945 
 946                 davinci_abort_data(host, data);
 947         }
 948 
 949         if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) {
 950                 /* Data CRC error */
 951                 data->error = -EILSEQ;
 952                 end_transfer = 1;
 953 
 954                 /* NOTE:  this controller uses CRCWR to report both CRC
 955                  * errors and timeouts (on writes).  MMCDRSP values are
 956                  * only weakly documented, but 0x9f was clearly a timeout
 957                  * case and the two three-bit patterns in various SD specs
 958                  * (101, 010) aren't part of it ...
 959                  */
 960                 if (qstatus & MMCST0_CRCWR) {
 961                         u32 temp = readb(host->base + DAVINCI_MMCDRSP);
 962 
 963                         if (temp == 0x9f)
 964                                 data->error = -ETIMEDOUT;
 965                 }
 966                 dev_dbg(mmc_dev(host->mmc), "data %s %s error\n",
 967                         (qstatus & MMCST0_CRCWR) ? "write" : "read",
 968                         (data->error == -ETIMEDOUT) ? "timeout" : "CRC");
 969 
 970                 davinci_abort_data(host, data);
 971         }
 972 
 973         if (qstatus & MMCST0_TOUTRS) {
 974                 /* Command timeout */
 975                 if (host->cmd) {
 976                         dev_dbg(mmc_dev(host->mmc),
 977                                 "CMD%d timeout, status %x\n",
 978                                 host->cmd->opcode, qstatus);
 979                         host->cmd->error = -ETIMEDOUT;
 980                         if (data) {
 981                                 end_transfer = 1;
 982                                 davinci_abort_data(host, data);
 983                         } else
 984                                 end_command = 1;
 985                 }
 986         }
 987 
 988         if (qstatus & MMCST0_CRCRS) {
 989                 /* Command CRC error */
 990                 dev_dbg(mmc_dev(host->mmc), "Command CRC error\n");
 991                 if (host->cmd) {
 992                         host->cmd->error = -EILSEQ;
 993                         end_command = 1;
 994                 }
 995         }
 996 
 997         if (qstatus & MMCST0_RSPDNE) {
 998                 /* End of command phase */
 999                 end_command = (int) host->cmd;
1000         }
1001 
1002         if (end_command)
1003                 mmc_davinci_cmd_done(host, host->cmd);
1004         if (end_transfer)
1005                 mmc_davinci_xfer_done(host, data);
1006         return IRQ_HANDLED;
1007 }
1008 
1009 static int mmc_davinci_get_cd(struct mmc_host *mmc)
1010 {
1011         struct platform_device *pdev = to_platform_device(mmc->parent);
1012         struct davinci_mmc_config *config = pdev->dev.platform_data;
1013 
1014         if (config && config->get_cd)
1015                 return config->get_cd(pdev->id);
1016 
1017         return mmc_gpio_get_cd(mmc);
1018 }
1019 
1020 static int mmc_davinci_get_ro(struct mmc_host *mmc)
1021 {
1022         struct platform_device *pdev = to_platform_device(mmc->parent);
1023         struct davinci_mmc_config *config = pdev->dev.platform_data;
1024 
1025         if (config && config->get_ro)
1026                 return config->get_ro(pdev->id);
1027 
1028         return mmc_gpio_get_ro(mmc);
1029 }
1030 
1031 static void mmc_davinci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1032 {
1033         struct mmc_davinci_host *host = mmc_priv(mmc);
1034 
1035         if (enable) {
1036                 if (!(readl(host->base + DAVINCI_SDIOST0) & SDIOST0_DAT1_HI)) {
1037                         writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
1038                         mmc_signal_sdio_irq(host->mmc);
1039                 } else {
1040                         host->sdio_int = true;
1041                         writel(readl(host->base + DAVINCI_SDIOIEN) |
1042                                SDIOIEN_IOINTEN, host->base + DAVINCI_SDIOIEN);
1043                 }
1044         } else {
1045                 host->sdio_int = false;
1046                 writel(readl(host->base + DAVINCI_SDIOIEN) & ~SDIOIEN_IOINTEN,
1047                        host->base + DAVINCI_SDIOIEN);
1048         }
1049 }
1050 
1051 static const struct mmc_host_ops mmc_davinci_ops = {
1052         .request        = mmc_davinci_request,
1053         .set_ios        = mmc_davinci_set_ios,
1054         .get_cd         = mmc_davinci_get_cd,
1055         .get_ro         = mmc_davinci_get_ro,
1056         .enable_sdio_irq = mmc_davinci_enable_sdio_irq,
1057 };
1058 
1059 /*----------------------------------------------------------------------*/
1060 
1061 #ifdef CONFIG_CPU_FREQ
1062 static int mmc_davinci_cpufreq_transition(struct notifier_block *nb,
1063                                      unsigned long val, void *data)
1064 {
1065         struct mmc_davinci_host *host;
1066         unsigned int mmc_pclk;
1067         struct mmc_host *mmc;
1068         unsigned long flags;
1069 
1070         host = container_of(nb, struct mmc_davinci_host, freq_transition);
1071         mmc = host->mmc;
1072         mmc_pclk = clk_get_rate(host->clk);
1073 
1074         if (val == CPUFREQ_POSTCHANGE) {
1075                 spin_lock_irqsave(&mmc->lock, flags);
1076                 host->mmc_input_clk = mmc_pclk;
1077                 calculate_clk_divider(mmc, &mmc->ios);
1078                 spin_unlock_irqrestore(&mmc->lock, flags);
1079         }
1080 
1081         return 0;
1082 }
1083 
1084 static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
1085 {
1086         host->freq_transition.notifier_call = mmc_davinci_cpufreq_transition;
1087 
1088         return cpufreq_register_notifier(&host->freq_transition,
1089                                          CPUFREQ_TRANSITION_NOTIFIER);
1090 }
1091 
1092 static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
1093 {
1094         cpufreq_unregister_notifier(&host->freq_transition,
1095                                     CPUFREQ_TRANSITION_NOTIFIER);
1096 }
1097 #else
1098 static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
1099 {
1100         return 0;
1101 }
1102 
1103 static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
1104 {
1105 }
1106 #endif
1107 static void init_mmcsd_host(struct mmc_davinci_host *host)
1108 {
1109 
1110         mmc_davinci_reset_ctrl(host, 1);
1111 
1112         writel(0, host->base + DAVINCI_MMCCLK);
1113         writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
1114 
1115         writel(0x1FFF, host->base + DAVINCI_MMCTOR);
1116         writel(0xFFFF, host->base + DAVINCI_MMCTOD);
1117 
1118         mmc_davinci_reset_ctrl(host, 0);
1119 }
1120 
1121 static const struct platform_device_id davinci_mmc_devtype[] = {
1122         {
1123                 .name   = "dm6441-mmc",
1124                 .driver_data = MMC_CTLR_VERSION_1,
1125         }, {
1126                 .name   = "da830-mmc",
1127                 .driver_data = MMC_CTLR_VERSION_2,
1128         },
1129         {},
1130 };
1131 MODULE_DEVICE_TABLE(platform, davinci_mmc_devtype);
1132 
1133 static const struct of_device_id davinci_mmc_dt_ids[] = {
1134         {
1135                 .compatible = "ti,dm6441-mmc",
1136                 .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_1],
1137         },
1138         {
1139                 .compatible = "ti,da830-mmc",
1140                 .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_2],
1141         },
1142         {},
1143 };
1144 MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids);
1145 
1146 static int mmc_davinci_parse_pdata(struct mmc_host *mmc)
1147 {
1148         struct platform_device *pdev = to_platform_device(mmc->parent);
1149         struct davinci_mmc_config *pdata = pdev->dev.platform_data;
1150         struct mmc_davinci_host *host;
1151         int ret;
1152 
1153         if (!pdata)
1154                 return -EINVAL;
1155 
1156         host = mmc_priv(mmc);
1157         if (!host)
1158                 return -EINVAL;
1159 
1160         if (pdata && pdata->nr_sg)
1161                 host->nr_sg = pdata->nr_sg - 1;
1162 
1163         if (pdata && (pdata->wires == 4 || pdata->wires == 0))
1164                 mmc->caps |= MMC_CAP_4_BIT_DATA;
1165 
1166         if (pdata && (pdata->wires == 8))
1167                 mmc->caps |= (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA);
1168 
1169         mmc->f_min = 312500;
1170         mmc->f_max = 25000000;
1171         if (pdata && pdata->max_freq)
1172                 mmc->f_max = pdata->max_freq;
1173         if (pdata && pdata->caps)
1174                 mmc->caps |= pdata->caps;
1175 
1176         /* Register a cd gpio, if there is not one, enable polling */
1177         ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
1178         if (ret == -EPROBE_DEFER)
1179                 return ret;
1180         else if (ret)
1181                 mmc->caps |= MMC_CAP_NEEDS_POLL;
1182 
1183         ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0, NULL);
1184         if (ret == -EPROBE_DEFER)
1185                 return ret;
1186 
1187         return 0;
1188 }
1189 
1190 static int davinci_mmcsd_probe(struct platform_device *pdev)
1191 {
1192         const struct of_device_id *match;
1193         struct mmc_davinci_host *host = NULL;
1194         struct mmc_host *mmc = NULL;
1195         struct resource *r, *mem = NULL;
1196         int ret, irq;
1197         size_t mem_size;
1198         const struct platform_device_id *id_entry;
1199 
1200         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1201         if (!r)
1202                 return -ENODEV;
1203         irq = platform_get_irq(pdev, 0);
1204         if (irq < 0)
1205                 return irq;
1206 
1207         mem_size = resource_size(r);
1208         mem = devm_request_mem_region(&pdev->dev, r->start, mem_size,
1209                                       pdev->name);
1210         if (!mem)
1211                 return -EBUSY;
1212 
1213         mmc = mmc_alloc_host(sizeof(struct mmc_davinci_host), &pdev->dev);
1214         if (!mmc)
1215                 return -ENOMEM;
1216 
1217         host = mmc_priv(mmc);
1218         host->mmc = mmc;        /* Important */
1219 
1220         host->mem_res = mem;
1221         host->base = devm_ioremap(&pdev->dev, mem->start, mem_size);
1222         if (!host->base) {
1223                 ret = -ENOMEM;
1224                 goto ioremap_fail;
1225         }
1226 
1227         host->clk = devm_clk_get(&pdev->dev, NULL);
1228         if (IS_ERR(host->clk)) {
1229                 ret = PTR_ERR(host->clk);
1230                 goto clk_get_fail;
1231         }
1232         ret = clk_prepare_enable(host->clk);
1233         if (ret)
1234                 goto clk_prepare_enable_fail;
1235 
1236         host->mmc_input_clk = clk_get_rate(host->clk);
1237 
1238         match = of_match_device(davinci_mmc_dt_ids, &pdev->dev);
1239         if (match) {
1240                 pdev->id_entry = match->data;
1241                 ret = mmc_of_parse(mmc);
1242                 if (ret) {
1243                         if (ret != -EPROBE_DEFER)
1244                                 dev_err(&pdev->dev,
1245                                         "could not parse of data: %d\n", ret);
1246                         goto parse_fail;
1247                 }
1248         } else {
1249                 ret = mmc_davinci_parse_pdata(mmc);
1250                 if (ret) {
1251                         dev_err(&pdev->dev,
1252                                 "could not parse platform data: %d\n", ret);
1253                         goto parse_fail;
1254         }       }
1255 
1256         if (host->nr_sg > MAX_NR_SG || !host->nr_sg)
1257                 host->nr_sg = MAX_NR_SG;
1258 
1259         init_mmcsd_host(host);
1260 
1261         host->use_dma = use_dma;
1262         host->mmc_irq = irq;
1263         host->sdio_irq = platform_get_irq(pdev, 1);
1264 
1265         if (host->use_dma) {
1266                 ret = davinci_acquire_dma_channels(host);
1267                 if (ret == -EPROBE_DEFER)
1268                         goto dma_probe_defer;
1269                 else if (ret)
1270                         host->use_dma = 0;
1271         }
1272 
1273         mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
1274 
1275         id_entry = platform_get_device_id(pdev);
1276         if (id_entry)
1277                 host->version = id_entry->driver_data;
1278 
1279         mmc->ops = &mmc_davinci_ops;
1280         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1281 
1282         /* With no iommu coalescing pages, each phys_seg is a hw_seg.
1283          * Each hw_seg uses one EDMA parameter RAM slot, always one
1284          * channel and then usually some linked slots.
1285          */
1286         mmc->max_segs           = MAX_NR_SG;
1287 
1288         /* EDMA limit per hw segment (one or two MBytes) */
1289         mmc->max_seg_size       = MAX_CCNT * rw_threshold;
1290 
1291         /* MMC/SD controller limits for multiblock requests */
1292         mmc->max_blk_size       = 4095;  /* BLEN is 12 bits */
1293         mmc->max_blk_count      = 65535; /* NBLK is 16 bits */
1294         mmc->max_req_size       = mmc->max_blk_size * mmc->max_blk_count;
1295 
1296         dev_dbg(mmc_dev(host->mmc), "max_segs=%d\n", mmc->max_segs);
1297         dev_dbg(mmc_dev(host->mmc), "max_blk_size=%d\n", mmc->max_blk_size);
1298         dev_dbg(mmc_dev(host->mmc), "max_req_size=%d\n", mmc->max_req_size);
1299         dev_dbg(mmc_dev(host->mmc), "max_seg_size=%d\n", mmc->max_seg_size);
1300 
1301         platform_set_drvdata(pdev, host);
1302 
1303         ret = mmc_davinci_cpufreq_register(host);
1304         if (ret) {
1305                 dev_err(&pdev->dev, "failed to register cpufreq\n");
1306                 goto cpu_freq_fail;
1307         }
1308 
1309         ret = mmc_add_host(mmc);
1310         if (ret < 0)
1311                 goto mmc_add_host_fail;
1312 
1313         ret = devm_request_irq(&pdev->dev, irq, mmc_davinci_irq, 0,
1314                                mmc_hostname(mmc), host);
1315         if (ret)
1316                 goto request_irq_fail;
1317 
1318         if (host->sdio_irq >= 0) {
1319                 ret = devm_request_irq(&pdev->dev, host->sdio_irq,
1320                                        mmc_davinci_sdio_irq, 0,
1321                                        mmc_hostname(mmc), host);
1322                 if (!ret)
1323                         mmc->caps |= MMC_CAP_SDIO_IRQ;
1324         }
1325 
1326         rename_region(mem, mmc_hostname(mmc));
1327 
1328         dev_info(mmc_dev(host->mmc), "Using %s, %d-bit mode\n",
1329                 host->use_dma ? "DMA" : "PIO",
1330                 (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);
1331 
1332         return 0;
1333 
1334 request_irq_fail:
1335         mmc_remove_host(mmc);
1336 mmc_add_host_fail:
1337         mmc_davinci_cpufreq_deregister(host);
1338 cpu_freq_fail:
1339         davinci_release_dma_channels(host);
1340 parse_fail:
1341 dma_probe_defer:
1342         clk_disable_unprepare(host->clk);
1343 clk_prepare_enable_fail:
1344 clk_get_fail:
1345 ioremap_fail:
1346         mmc_free_host(mmc);
1347 
1348         return ret;
1349 }
1350 
1351 static int __exit davinci_mmcsd_remove(struct platform_device *pdev)
1352 {
1353         struct mmc_davinci_host *host = platform_get_drvdata(pdev);
1354 
1355         mmc_remove_host(host->mmc);
1356         mmc_davinci_cpufreq_deregister(host);
1357         davinci_release_dma_channels(host);
1358         clk_disable_unprepare(host->clk);
1359         mmc_free_host(host->mmc);
1360 
1361         return 0;
1362 }
1363 
1364 #ifdef CONFIG_PM
1365 static int davinci_mmcsd_suspend(struct device *dev)
1366 {
1367         struct mmc_davinci_host *host = dev_get_drvdata(dev);
1368 
1369         writel(0, host->base + DAVINCI_MMCIM);
1370         mmc_davinci_reset_ctrl(host, 1);
1371         clk_disable(host->clk);
1372 
1373         return 0;
1374 }
1375 
1376 static int davinci_mmcsd_resume(struct device *dev)
1377 {
1378         struct mmc_davinci_host *host = dev_get_drvdata(dev);
1379 
1380         clk_enable(host->clk);
1381         mmc_davinci_reset_ctrl(host, 0);
1382 
1383         return 0;
1384 }
1385 
1386 static const struct dev_pm_ops davinci_mmcsd_pm = {
1387         .suspend        = davinci_mmcsd_suspend,
1388         .resume         = davinci_mmcsd_resume,
1389 };
1390 
1391 #define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm)
1392 #else
1393 #define davinci_mmcsd_pm_ops NULL
1394 #endif
1395 
1396 static struct platform_driver davinci_mmcsd_driver = {
1397         .driver         = {
1398                 .name   = "davinci_mmc",
1399                 .pm     = davinci_mmcsd_pm_ops,
1400                 .of_match_table = davinci_mmc_dt_ids,
1401         },
1402         .probe          = davinci_mmcsd_probe,
1403         .remove         = __exit_p(davinci_mmcsd_remove),
1404         .id_table       = davinci_mmc_devtype,
1405 };
1406 
1407 module_platform_driver(davinci_mmcsd_driver);
1408 
1409 MODULE_AUTHOR("Texas Instruments India");
1410 MODULE_LICENSE("GPL");
1411 MODULE_DESCRIPTION("MMC/SD driver for Davinci MMC controller");
1412 MODULE_ALIAS("platform:davinci_mmc");
1413
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root/drivers/mmc/host/davinci_mmc.c

DEFINITIONS
