git.oblomov.eu Git - linux-2.6/blob - drivers/mmc/host/mvsdio.c

   1 /*
   2  * Marvell MMC/SD/SDIO driver
   3  *
   4  * Authors: Maen Suleiman, Nicolas Pitre
   5  * Copyright (C) 2008-2009 Marvell Ltd.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/mbus.h>
  17 #include <linux/delay.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/scatterlist.h>
  21 #include <linux/irq.h>
  22 #include <linux/gpio.h>
  23 #include <linux/mmc/host.h>
  24
  25 #include <asm/sizes.h>
  26 #include <asm/unaligned.h>
  27 #include <plat/mvsdio.h>
  28
  29 #include "mvsdio.h"
  30
  31 #define DRIVER_NAME     "mvsdio"
  32
  33 static int maxfreq = MVSD_CLOCKRATE_MAX;
  34 static int nodma;
  35
  36 struct mvsd_host {
  37         void __iomem *base;
  38         struct mmc_request *mrq;
  39         spinlock_t lock;
  40         unsigned int xfer_mode;
  41         unsigned int intr_en;
  42         unsigned int ctrl;
  43         unsigned int pio_size;
  44         void *pio_ptr;
  45         unsigned int sg_frags;
  46         unsigned int ns_per_clk;
  47         unsigned int clock;
  48         unsigned int base_clock;
  49         struct timer_list timer;
  50         struct mmc_host *mmc;
  51         struct device *dev;
  52         struct resource *res;
  53         int irq;
  54         int gpio_card_detect;
  55         int gpio_write_protect;
  56 };
  57
  58 #define mvsd_write(offs, val)   writel(val, iobase + (offs))
  59 #define mvsd_read(offs)         readl(iobase + (offs))
  60
  61 static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
  62 {
  63         void __iomem *iobase = host->base;
  64         unsigned int tmout;
  65         int tmout_index;
  66
  67         /* If timeout=0 then maximum timeout index is used. */
  68         tmout = DIV_ROUND_UP(data->timeout_ns, host->ns_per_clk);
  69         tmout += data->timeout_clks;
  70         tmout_index = fls(tmout - 1) - 12;
  71         if (tmout_index < 0)
  72                 tmout_index = 0;
  73         if (tmout_index > MVSD_HOST_CTRL_TMOUT_MAX)
  74                 tmout_index = MVSD_HOST_CTRL_TMOUT_MAX;
  75
  76         dev_dbg(host->dev, "data %s at 0x%08x: blocks=%d blksz=%d tmout=%u (%d)\n",
  77                 (data->flags & MMC_DATA_READ) ? "read" : "write",
  78                 (u32)sg_virt(data->sg), data->blocks, data->blksz,
  79                 tmout, tmout_index);
  80
  81         host->ctrl &= ~MVSD_HOST_CTRL_TMOUT_MASK;
  82         host->ctrl |= MVSD_HOST_CTRL_TMOUT(tmout_index);
  83         mvsd_write(MVSD_HOST_CTRL, host->ctrl);
  84         mvsd_write(MVSD_BLK_COUNT, data->blocks);
  85         mvsd_write(MVSD_BLK_SIZE, data->blksz);
  86
  87         if (nodma || (data->blksz | data->sg->offset) & 3) {
  88                 /*
  89                  * We cannot do DMA on a buffer which offset or size
  90                  * is not aligned on a 4-byte boundary.
  91                  */
  92                 host->pio_size = data->blocks * data->blksz;
  93                 host->pio_ptr = sg_virt(data->sg);
  94                 if (!nodma)
  95                         printk(KERN_DEBUG "%s: fallback to PIO for data "
  96                                           "at 0x%p size %d\n",
  97                                           mmc_hostname(host->mmc),
  98                                           host->pio_ptr, host->pio_size);
  99                 return 1;
 100         } else {
 101                 dma_addr_t phys_addr;
 102                 int dma_dir = (data->flags & MMC_DATA_READ) ?
 103                         DMA_FROM_DEVICE : DMA_TO_DEVICE;
 104                 host->sg_frags = dma_map_sg(mmc_dev(host->mmc), data->sg,
 105                                             data->sg_len, dma_dir);
 106                 phys_addr = sg_dma_address(data->sg);
 107                 mvsd_write(MVSD_SYS_ADDR_LOW, (u32)phys_addr & 0xffff);
 108                 mvsd_write(MVSD_SYS_ADDR_HI,  (u32)phys_addr >> 16);
 109                 return 0;
 110         }
 111 }
 112
 113 static void mvsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 114 {
 115         struct mvsd_host *host = mmc_priv(mmc);
 116         void __iomem *iobase = host->base;
 117         struct mmc_command *cmd = mrq->cmd;
 118         u32 cmdreg = 0, xfer = 0, intr = 0;
 119         unsigned long flags;
 120
 121         BUG_ON(host->mrq != NULL);
 122         host->mrq = mrq;
 123
 124         dev_dbg(host->dev, "cmd %d (hw state 0x%04x)\n",
 125                 cmd->opcode, mvsd_read(MVSD_HW_STATE));
 126
 127         cmdreg = MVSD_CMD_INDEX(cmd->opcode);
 128
 129         if (cmd->flags & MMC_RSP_BUSY)
 130                 cmdreg |= MVSD_CMD_RSP_48BUSY;
 131         else if (cmd->flags & MMC_RSP_136)
 132                 cmdreg |= MVSD_CMD_RSP_136;
 133         else if (cmd->flags & MMC_RSP_PRESENT)
 134                 cmdreg |= MVSD_CMD_RSP_48;
 135         else
 136                 cmdreg |= MVSD_CMD_RSP_NONE;
 137
 138         if (cmd->flags & MMC_RSP_CRC)
 139                 cmdreg |= MVSD_CMD_CHECK_CMDCRC;
 140
 141         if (cmd->flags & MMC_RSP_OPCODE)
 142                 cmdreg |= MVSD_CMD_INDX_CHECK;
 143
 144         if (cmd->flags & MMC_RSP_PRESENT) {
 145                 cmdreg |= MVSD_UNEXPECTED_RESP;
 146                 intr |= MVSD_NOR_UNEXP_RSP;
 147         }
 148
 149         if (mrq->data) {
 150                 struct mmc_data *data = mrq->data;
 151                 int pio;
 152
 153                 cmdreg |= MVSD_CMD_DATA_PRESENT | MVSD_CMD_CHECK_DATACRC16;
 154                 xfer |= MVSD_XFER_MODE_HW_WR_DATA_EN;
 155                 if (data->flags & MMC_DATA_READ)
 156                         xfer |= MVSD_XFER_MODE_TO_HOST;
 157
 158                 pio = mvsd_setup_data(host, data);
 159                 if (pio) {
 160                         xfer |= MVSD_XFER_MODE_PIO;
 161                         /* PIO section of mvsd_irq has comments on those bits */
 162                         if (data->flags & MMC_DATA_WRITE)
 163                                 intr |= MVSD_NOR_TX_AVAIL;
 164                         else if (host->pio_size > 32)
 165                                 intr |= MVSD_NOR_RX_FIFO_8W;
 166                         else
 167                                 intr |= MVSD_NOR_RX_READY;
 168                 }
 169
 170                 if (data->stop) {
 171                         struct mmc_command *stop = data->stop;
 172                         u32 cmd12reg = 0;
 173
 174                         mvsd_write(MVSD_AUTOCMD12_ARG_LOW, stop->arg & 0xffff);
 175                         mvsd_write(MVSD_AUTOCMD12_ARG_HI,  stop->arg >> 16);
 176
 177                         if (stop->flags & MMC_RSP_BUSY)
 178                                 cmd12reg |= MVSD_AUTOCMD12_BUSY;
 179                         if (stop->flags & MMC_RSP_OPCODE)
 180                                 cmd12reg |= MVSD_AUTOCMD12_INDX_CHECK;
 181                         cmd12reg |= MVSD_AUTOCMD12_INDEX(stop->opcode);
 182                         mvsd_write(MVSD_AUTOCMD12_CMD, cmd12reg);
 183
 184                         xfer |= MVSD_XFER_MODE_AUTO_CMD12;
 185                         intr |= MVSD_NOR_AUTOCMD12_DONE;
 186                 } else {
 187                         intr |= MVSD_NOR_XFER_DONE;
 188                 }
 189         } else {
 190                 intr |= MVSD_NOR_CMD_DONE;
 191         }
 192
 193         mvsd_write(MVSD_ARG_LOW, cmd->arg & 0xffff);
 194         mvsd_write(MVSD_ARG_HI,  cmd->arg >> 16);
 195
 196         spin_lock_irqsave(&host->lock, flags);
 197
 198         host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
 199         host->xfer_mode |= xfer;
 200         mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
 201
 202         mvsd_write(MVSD_NOR_INTR_STATUS, ~MVSD_NOR_CARD_INT);
 203         mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
 204         mvsd_write(MVSD_CMD, cmdreg);
 205
 206         host->intr_en &= MVSD_NOR_CARD_INT;
 207         host->intr_en |= intr | MVSD_NOR_ERROR;
 208         mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
 209         mvsd_write(MVSD_ERR_INTR_EN, 0xffff);
 210
 211         mod_timer(&host->timer, jiffies + 5 * HZ);
 212
 213         spin_unlock_irqrestore(&host->lock, flags);
 214 }
 215
 216 static u32 mvsd_finish_cmd(struct mvsd_host *host, struct mmc_command *cmd,
 217                            u32 err_status)
 218 {
 219         void __iomem *iobase = host->base;
 220
 221         if (cmd->flags & MMC_RSP_136) {
 222                 unsigned int response[8], i;
 223                 for (i = 0; i < 8; i++)
 224                         response[i] = mvsd_read(MVSD_RSP(i));
 225                 cmd->resp[0] =          ((response[0] & 0x03ff) << 22) |
 226                                         ((response[1] & 0xffff) << 6) |
 227                                         ((response[2] & 0xfc00) >> 10);
 228                 cmd->resp[1] =          ((response[2] & 0x03ff) << 22) |
 229                                         ((response[3] & 0xffff) << 6) |
 230                                         ((response[4] & 0xfc00) >> 10);
 231                 cmd->resp[2] =          ((response[4] & 0x03ff) << 22) |
 232                                         ((response[5] & 0xffff) << 6) |
 233                                         ((response[6] & 0xfc00) >> 10);
 234                 cmd->resp[3] =          ((response[6] & 0x03ff) << 22) |
 235                                         ((response[7] & 0x3fff) << 8);
 236         } else if (cmd->flags & MMC_RSP_PRESENT) {
 237                 unsigned int response[3], i;
 238                 for (i = 0; i < 3; i++)
 239                         response[i] = mvsd_read(MVSD_RSP(i));
 240                 cmd->resp[0] =          ((response[2] & 0x003f) << (8 - 8)) |
 241                                         ((response[1] & 0xffff) << (14 - 8)) |
 242                                         ((response[0] & 0x03ff) << (30 - 8));
 243                 cmd->resp[1] =          ((response[0] & 0xfc00) >> 10);
 244                 cmd->resp[2] = 0;
 245                 cmd->resp[3] = 0;
 246         }
 247
 248         if (err_status & MVSD_ERR_CMD_TIMEOUT) {
 249                 cmd->error = -ETIMEDOUT;
 250         } else if (err_status & (MVSD_ERR_CMD_CRC | MVSD_ERR_CMD_ENDBIT |
 251                                  MVSD_ERR_CMD_INDEX | MVSD_ERR_CMD_STARTBIT)) {
 252                 cmd->error = -EILSEQ;
 253         }
 254         err_status &= ~(MVSD_ERR_CMD_TIMEOUT | MVSD_ERR_CMD_CRC |
 255                         MVSD_ERR_CMD_ENDBIT | MVSD_ERR_CMD_INDEX |
 256                         MVSD_ERR_CMD_STARTBIT);
 257
 258         return err_status;
 259 }
 260
 261 static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data,
 262                             u32 err_status)
 263 {
 264         void __iomem *iobase = host->base;
 265
 266         if (host->pio_ptr) {
 267                 host->pio_ptr = NULL;
 268                 host->pio_size = 0;
 269         } else {
 270                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags,
 271                              (data->flags & MMC_DATA_READ) ?
 272                                 DMA_FROM_DEVICE : DMA_TO_DEVICE);
 273         }
 274
 275         if (err_status & MVSD_ERR_DATA_TIMEOUT)
 276                 data->error = -ETIMEDOUT;
 277         else if (err_status & (MVSD_ERR_DATA_CRC | MVSD_ERR_DATA_ENDBIT))
 278                 data->error = -EILSEQ;
 279         else if (err_status & MVSD_ERR_XFER_SIZE)
 280                 data->error = -EBADE;
 281         err_status &= ~(MVSD_ERR_DATA_TIMEOUT | MVSD_ERR_DATA_CRC |
 282                         MVSD_ERR_DATA_ENDBIT | MVSD_ERR_XFER_SIZE);
 283
 284         dev_dbg(host->dev, "data done: blocks_left=%d, bytes_left=%d\n",
 285                 mvsd_read(MVSD_CURR_BLK_LEFT), mvsd_read(MVSD_CURR_BYTE_LEFT));
 286         data->bytes_xfered =
 287                 (data->blocks - mvsd_read(MVSD_CURR_BLK_LEFT)) * data->blksz;
 288         /* We can't be sure about the last block when errors are detected */
 289         if (data->bytes_xfered && data->error)
 290                 data->bytes_xfered -= data->blksz;
 291
 292         /* Handle Auto cmd 12 response */
 293         if (data->stop) {
 294                 unsigned int response[3], i;
 295                 for (i = 0; i < 3; i++)
 296                         response[i] = mvsd_read(MVSD_AUTO_RSP(i));
 297                 data->stop->resp[0] =   ((response[2] & 0x003f) << (8 - 8)) |
 298                                         ((response[1] & 0xffff) << (14 - 8)) |
 299                                         ((response[0] & 0x03ff) << (30 - 8));
 300                 data->stop->resp[1] =   ((response[0] & 0xfc00) >> 10);
 301                 data->stop->resp[2] = 0;
 302                 data->stop->resp[3] = 0;
 303
 304                 if (err_status & MVSD_ERR_AUTOCMD12) {
 305                         u32 err_cmd12 = mvsd_read(MVSD_AUTOCMD12_ERR_STATUS);
 306                         dev_dbg(host->dev, "c12err 0x%04x\n", err_cmd12);
 307                         if (err_cmd12 & MVSD_AUTOCMD12_ERR_NOTEXE)
 308                                 data->stop->error = -ENOEXEC;
 309                         else if (err_cmd12 & MVSD_AUTOCMD12_ERR_TIMEOUT)
 310                                 data->stop->error = -ETIMEDOUT;
 311                         else if (err_cmd12)
 312                                 data->stop->error = -EILSEQ;
 313                         err_status &= ~MVSD_ERR_AUTOCMD12;
 314                 }
 315         }
 316
 317         return err_status;
 318 }
 319
 320 static irqreturn_t mvsd_irq(int irq, void *dev)
 321 {
 322         struct mvsd_host *host = dev;
 323         void __iomem *iobase = host->base;
 324         u32 intr_status, intr_done_mask;
 325         int irq_handled = 0;
 326
 327         intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 328         dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n",
 329                 intr_status, mvsd_read(MVSD_NOR_INTR_EN),
 330                 mvsd_read(MVSD_HW_STATE));
 331
 332         spin_lock(&host->lock);
 333
 334         /* PIO handling, if needed. Messy business... */
 335         if (host->pio_size &&
 336             (intr_status & host->intr_en &
 337              (MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) {
 338                 u16 *p = host->pio_ptr;
 339                 int s = host->pio_size;
 340                 while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) {
 341                         readsw(iobase + MVSD_FIFO, p, 16);
 342                         p += 16;
 343                         s -= 32;
 344                         intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 345                 }
 346                 /*
 347                  * Normally we'd use < 32 here, but the RX_FIFO_8W bit
 348                  * doesn't appear to assert when there is exactly 32 bytes
 349                  * (8 words) left to fetch in a transfer.
 350                  */
 351                 if (s <= 32) {
 352                         while (s >= 4 && (intr_status & MVSD_NOR_RX_READY)) {
 353                                 put_unaligned(mvsd_read(MVSD_FIFO), p++);
 354                                 put_unaligned(mvsd_read(MVSD_FIFO), p++);
 355                                 s -= 4;
 356                                 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 357                         }
 358                         if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) {
 359                                 u16 val[2] = {0, 0};
 360                                 val[0] = mvsd_read(MVSD_FIFO);
 361                                 val[1] = mvsd_read(MVSD_FIFO);
 362                                 memcpy(p, &val, s);
 363                                 s = 0;
 364                                 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 365                         }
 366                         if (s == 0) {
 367                                 host->intr_en &=
 368                                      ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W);
 369                                 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
 370                         } else if (host->intr_en & MVSD_NOR_RX_FIFO_8W) {
 371                                 host->intr_en &= ~MVSD_NOR_RX_FIFO_8W;
 372                                 host->intr_en |= MVSD_NOR_RX_READY;
 373                                 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
 374                         }
 375                 }
 376                 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
 377                         s, intr_status, mvsd_read(MVSD_HW_STATE));
 378                 host->pio_ptr = p;
 379                 host->pio_size = s;
 380                 irq_handled = 1;
 381         } else if (host->pio_size &&
 382                    (intr_status & host->intr_en &
 383                     (MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) {
 384                 u16 *p = host->pio_ptr;
 385                 int s = host->pio_size;
 386                 /*
 387                  * The TX_FIFO_8W bit is unreliable. When set, bursting
 388                  * 16 halfwords all at once in the FIFO drops data. Actually
 389                  * TX_AVAIL does go off after only one word is pushed even if
 390                  * TX_FIFO_8W remains set.
 391                  */
 392                 while (s >= 4 && (intr_status & MVSD_NOR_TX_AVAIL)) {
 393                         mvsd_write(MVSD_FIFO, get_unaligned(p++));
 394                         mvsd_write(MVSD_FIFO, get_unaligned(p++));
 395                         s -= 4;
 396                         intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 397                 }
 398                 if (s < 4) {
 399                         if (s && (intr_status & MVSD_NOR_TX_AVAIL)) {
 400                                 u16 val[2] = {0, 0};
 401                                 memcpy(&val, p, s);
 402                                 mvsd_write(MVSD_FIFO, val[0]);
 403                                 mvsd_write(MVSD_FIFO, val[1]);
 404                                 s = 0;
 405                                 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 406                         }
 407                         if (s == 0) {
 408                                 host->intr_en &=
 409                                      ~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
 410                                 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
 411                         }
 412                 }
 413                 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
 414                         s, intr_status, mvsd_read(MVSD_HW_STATE));
 415                 host->pio_ptr = p;
 416                 host->pio_size = s;
 417                 irq_handled = 1;
 418         }
 419
 420         mvsd_write(MVSD_NOR_INTR_STATUS, intr_status);
 421
 422         intr_done_mask = MVSD_NOR_CARD_INT | MVSD_NOR_RX_READY |
 423                          MVSD_NOR_RX_FIFO_8W | MVSD_NOR_TX_FIFO_8W;
 424         if (intr_status & host->intr_en & ~intr_done_mask) {
 425                 struct mmc_request *mrq = host->mrq;
 426                 struct mmc_command *cmd = mrq->cmd;
 427                 u32 err_status = 0;
 428
 429                 del_timer(&host->timer);
 430                 host->mrq = NULL;
 431
 432                 host->intr_en &= MVSD_NOR_CARD_INT;
 433                 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
 434                 mvsd_write(MVSD_ERR_INTR_EN, 0);
 435
 436                 spin_unlock(&host->lock);
 437
 438                 if (intr_status & MVSD_NOR_UNEXP_RSP) {
 439                         cmd->error = -EPROTO;
 440                 } else if (intr_status & MVSD_NOR_ERROR) {
 441                         err_status = mvsd_read(MVSD_ERR_INTR_STATUS);
 442                         dev_dbg(host->dev, "err 0x%04x\n", err_status);
 443                 }
 444
 445                 err_status = mvsd_finish_cmd(host, cmd, err_status);
 446                 if (mrq->data)
 447                         err_status = mvsd_finish_data(host, mrq->data, err_status);
 448                 if (err_status) {
 449                         printk(KERN_ERR "%s: unhandled error status %#04x\n",
 450                                         mmc_hostname(host->mmc), err_status);
 451                         cmd->error = -ENOMSG;
 452                 }
 453
 454                 mmc_request_done(host->mmc, mrq);
 455                 irq_handled = 1;
 456         } else
 457                 spin_unlock(&host->lock);
 458
 459         if (intr_status & MVSD_NOR_CARD_INT) {
 460                 mmc_signal_sdio_irq(host->mmc);
 461                 irq_handled = 1;
 462         }
 463
 464         if (irq_handled)
 465                 return IRQ_HANDLED;
 466
 467         printk(KERN_ERR "%s: unhandled interrupt status=0x%04x en=0x%04x "
 468                         "pio=%d\n", mmc_hostname(host->mmc), intr_status,
 469                         host->intr_en, host->pio_size);
 470         return IRQ_NONE;
 471 }
 472
 473 static void mvsd_timeout_timer(unsigned long data)
 474 {
 475         struct mvsd_host *host = (struct mvsd_host *)data;
 476         void __iomem *iobase = host->base;
 477         struct mmc_request *mrq;
 478         unsigned long flags;
 479
 480         spin_lock_irqsave(&host->lock, flags);
 481         mrq = host->mrq;
 482         if (mrq) {
 483                 printk(KERN_ERR "%s: Timeout waiting for hardware interrupt.\n",
 484                                 mmc_hostname(host->mmc));
 485                 printk(KERN_ERR "%s: hw_state=0x%04x, intr_status=0x%04x "
 486                                 "intr_en=0x%04x\n", mmc_hostname(host->mmc),
 487                                 mvsd_read(MVSD_HW_STATE),
 488                                 mvsd_read(MVSD_NOR_INTR_STATUS),
 489                                 mvsd_read(MVSD_NOR_INTR_EN));
 490
 491                 host->mrq = NULL;
 492
 493                 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
 494
 495                 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
 496                 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
 497
 498                 host->intr_en &= MVSD_NOR_CARD_INT;
 499                 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
 500                 mvsd_write(MVSD_ERR_INTR_EN, 0);
 501                 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
 502
 503                 mrq->cmd->error = -ETIMEDOUT;
 504                 mvsd_finish_cmd(host, mrq->cmd, 0);
 505                 if (mrq->data) {
 506                         mrq->data->error = -ETIMEDOUT;
 507                         mvsd_finish_data(host, mrq->data, 0);
 508                 }
 509         }
 510         spin_unlock_irqrestore(&host->lock, flags);
 511
 512         if (mrq)
 513                 mmc_request_done(host->mmc, mrq);
 514 }
 515
 516 static irqreturn_t mvsd_card_detect_irq(int irq, void *dev)
 517 {
 518         struct mvsd_host *host = dev;
 519         mmc_detect_change(host->mmc, msecs_to_jiffies(100));
 520         return IRQ_HANDLED;
 521 }
 522
 523 static void mvsd_enable_sdio_irq(struct mmc_host *mmc, int enable)
 524 {
 525         struct mvsd_host *host = mmc_priv(mmc);
 526         void __iomem *iobase = host->base;
 527         unsigned long flags;
 528
 529         spin_lock_irqsave(&host->lock, flags);
 530         if (enable) {
 531                 host->xfer_mode |= MVSD_XFER_MODE_INT_CHK_EN;
 532                 host->intr_en |= MVSD_NOR_CARD_INT;
 533         } else {
 534                 host->xfer_mode &= ~MVSD_XFER_MODE_INT_CHK_EN;
 535                 host->intr_en &= ~MVSD_NOR_CARD_INT;
 536         }
 537         mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
 538         mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
 539         spin_unlock_irqrestore(&host->lock, flags);
 540 }
 541
 542 static int mvsd_get_ro(struct mmc_host *mmc)
 543 {
 544         struct mvsd_host *host = mmc_priv(mmc);
 545
 546         if (host->gpio_write_protect)
 547                 return gpio_get_value(host->gpio_write_protect);
 548
 549         /*
 550          * Board doesn't support read only detection; let the mmc core
 551          * decide what to do.
 552          */
 553         return -ENOSYS;
 554 }
 555
 556 static void mvsd_power_up(struct mvsd_host *host)
 557 {
 558         void __iomem *iobase = host->base;
 559         dev_dbg(host->dev, "power up\n");
 560         mvsd_write(MVSD_NOR_INTR_EN, 0);
 561         mvsd_write(MVSD_ERR_INTR_EN, 0);
 562         mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
 563         mvsd_write(MVSD_XFER_MODE, 0);
 564         mvsd_write(MVSD_NOR_STATUS_EN, 0xffff);
 565         mvsd_write(MVSD_ERR_STATUS_EN, 0xffff);
 566         mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
 567         mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
 568 }
 569
 570 static void mvsd_power_down(struct mvsd_host *host)
 571 {
 572         void __iomem *iobase = host->base;
 573         dev_dbg(host->dev, "power down\n");
 574         mvsd_write(MVSD_NOR_INTR_EN, 0);
 575         mvsd_write(MVSD_ERR_INTR_EN, 0);
 576         mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
 577         mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
 578         mvsd_write(MVSD_NOR_STATUS_EN, 0);
 579         mvsd_write(MVSD_ERR_STATUS_EN, 0);
 580         mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
 581         mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
 582 }
 583
 584 static void mvsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 585 {
 586         struct mvsd_host *host = mmc_priv(mmc);
 587         void __iomem *iobase = host->base;
 588         u32 ctrl_reg = 0;
 589
 590         if (ios->power_mode == MMC_POWER_UP)
 591                 mvsd_power_up(host);
 592
 593         if (ios->clock == 0) {
 594                 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
 595                 mvsd_write(MVSD_CLK_DIV, MVSD_BASE_DIV_MAX);
 596                 host->clock = 0;
 597                 dev_dbg(host->dev, "clock off\n");
 598         } else if (ios->clock != host->clock) {
 599                 u32 m = DIV_ROUND_UP(host->base_clock, ios->clock) - 1;
 600                 if (m > MVSD_BASE_DIV_MAX)
 601                         m = MVSD_BASE_DIV_MAX;
 602                 mvsd_write(MVSD_CLK_DIV, m);
 603                 host->clock = ios->clock;
 604                 host->ns_per_clk = 1000000000 / (host->base_clock / (m+1));
 605                 dev_dbg(host->dev, "clock=%d (%d), div=0x%04x\n",
 606                         ios->clock, host->base_clock / (m+1), m);
 607         }
 608
 609         /* default transfer mode */
 610         ctrl_reg |= MVSD_HOST_CTRL_BIG_ENDIAN;
 611         ctrl_reg &= ~MVSD_HOST_CTRL_LSB_FIRST;
 612
 613         /* default to maximum timeout */
 614         ctrl_reg |= MVSD_HOST_CTRL_TMOUT_MASK;
 615         ctrl_reg |= MVSD_HOST_CTRL_TMOUT_EN;
 616
 617         if (ios->bus_mode == MMC_BUSMODE_PUSHPULL)
 618                 ctrl_reg |= MVSD_HOST_CTRL_PUSH_PULL_EN;
 619
 620         if (ios->bus_width == MMC_BUS_WIDTH_4)
 621                 ctrl_reg |= MVSD_HOST_CTRL_DATA_WIDTH_4_BITS;
 622
 623         if (ios->timing == MMC_TIMING_MMC_HS ||
 624             ios->timing == MMC_TIMING_SD_HS)
 625                 ctrl_reg |= MVSD_HOST_CTRL_HI_SPEED_EN;
 626
 627         host->ctrl = ctrl_reg;
 628         mvsd_write(MVSD_HOST_CTRL, ctrl_reg);
 629         dev_dbg(host->dev, "ctrl 0x%04x: %s %s %s\n", ctrl_reg,
 630                 (ctrl_reg & MVSD_HOST_CTRL_PUSH_PULL_EN) ?
 631                         "push-pull" : "open-drain",
 632                 (ctrl_reg & MVSD_HOST_CTRL_DATA_WIDTH_4_BITS) ?
 633                         "4bit-width" : "1bit-width",
 634                 (ctrl_reg & MVSD_HOST_CTRL_HI_SPEED_EN) ?
 635                         "high-speed" : "");
 636
 637         if (ios->power_mode == MMC_POWER_OFF)
 638                 mvsd_power_down(host);
 639 }
 640
 641 static const struct mmc_host_ops mvsd_ops = {
 642         .request                = mvsd_request,
 643         .get_ro                 = mvsd_get_ro,
 644         .set_ios                = mvsd_set_ios,
 645         .enable_sdio_irq        = mvsd_enable_sdio_irq,
 646 };
 647
 648 static void __init mv_conf_mbus_windows(struct mvsd_host *host,
 649                                         struct mbus_dram_target_info *dram)
 650 {
 651         void __iomem *iobase = host->base;
 652         int i;
 653
 654         for (i = 0; i < 4; i++) {
 655                 writel(0, iobase + MVSD_WINDOW_CTRL(i));
 656                 writel(0, iobase + MVSD_WINDOW_BASE(i));
 657         }
 658
 659         for (i = 0; i < dram->num_cs; i++) {
 660                 struct mbus_dram_window *cs = dram->cs + i;
 661                 writel(((cs->size - 1) & 0xffff0000) |
 662                        (cs->mbus_attr << 8) |
 663                        (dram->mbus_dram_target_id << 4) | 1,
 664                        iobase + MVSD_WINDOW_CTRL(i));
 665                 writel(cs->base, iobase + MVSD_WINDOW_BASE(i));
 666         }
 667 }
 668
 669 static int __init mvsd_probe(struct platform_device *pdev)
 670 {
 671         struct mmc_host *mmc = NULL;
 672         struct mvsd_host *host = NULL;
 673         const struct mvsdio_platform_data *mvsd_data;
 674         struct resource *r;
 675         int ret, irq;
 676
 677         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 678         irq = platform_get_irq(pdev, 0);
 679         mvsd_data = pdev->dev.platform_data;
 680         if (!r || irq < 0 || !mvsd_data)
 681                 return -ENXIO;
 682
 683         r = request_mem_region(r->start, SZ_1K, DRIVER_NAME);
 684         if (!r)
 685                 return -EBUSY;
 686
 687         mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev);
 688         if (!mmc) {
 689                 ret = -ENOMEM;
 690                 goto out;
 691         }
 692
 693         host = mmc_priv(mmc);
 694         host->mmc = mmc;
 695         host->dev = &pdev->dev;
 696         host->res = r;
 697         host->base_clock = mvsd_data->clock / 2;
 698
 699         mmc->ops = &mvsd_ops;
 700
 701         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 702         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ |
 703                     MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
 704
 705         mmc->f_min = DIV_ROUND_UP(host->base_clock, MVSD_BASE_DIV_MAX);
 706         mmc->f_max = maxfreq;
 707
 708         mmc->max_blk_size = 2048;
 709         mmc->max_blk_count = 65535;
 710
 711         mmc->max_hw_segs = 1;
 712         mmc->max_phys_segs = 1;
 713         mmc->max_seg_size = mmc->max_blk_size * mmc->max_blk_count;
 714         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
 715
 716         spin_lock_init(&host->lock);
 717
 718         host->base = ioremap(r->start, SZ_4K);
 719         if (!host->base) {
 720                 ret = -ENOMEM;
 721                 goto out;
 722         }
 723
 724         /* (Re-)program MBUS remapping windows if we are asked to. */
 725         if (mvsd_data->dram != NULL)
 726                 mv_conf_mbus_windows(host, mvsd_data->dram);
 727
 728         mvsd_power_down(host);
 729
 730         ret = request_irq(irq, mvsd_irq, 0, DRIVER_NAME, host);
 731         if (ret) {
 732                 printk(KERN_ERR "%s: cannot assign irq %d\n", DRIVER_NAME, irq);
 733                 goto out;
 734         } else
 735                 host->irq = irq;
 736
 737         if (mvsd_data->gpio_card_detect) {
 738                 ret = gpio_request(mvsd_data->gpio_card_detect,
 739                                    DRIVER_NAME " cd");
 740                 if (ret == 0) {
 741                         gpio_direction_input(mvsd_data->gpio_card_detect);
 742                         irq = gpio_to_irq(mvsd_data->gpio_card_detect);
 743                         ret = request_irq(irq, mvsd_card_detect_irq,
 744                                           IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING,
 745                                           DRIVER_NAME " cd", host);
 746                         if (ret == 0)
 747                                 host->gpio_card_detect =
 748                                         mvsd_data->gpio_card_detect;
 749                         else
 750                                 gpio_free(mvsd_data->gpio_card_detect);
 751                 }
 752         }
 753         if (!host->gpio_card_detect)
 754                 mmc->caps |= MMC_CAP_NEEDS_POLL;
 755
 756         if (mvsd_data->gpio_write_protect) {
 757                 ret = gpio_request(mvsd_data->gpio_write_protect,
 758                                    DRIVER_NAME " wp");
 759                 if (ret == 0) {
 760                         gpio_direction_input(mvsd_data->gpio_write_protect);
 761                         host->gpio_write_protect =
 762                                 mvsd_data->gpio_write_protect;
 763                 }
 764         }
 765
 766         setup_timer(&host->timer, mvsd_timeout_timer, (unsigned long)host);
 767         platform_set_drvdata(pdev, mmc);
 768         ret = mmc_add_host(mmc);
 769         if (ret)
 770                 goto out;
 771
 772         printk(KERN_NOTICE "%s: %s driver initialized, ",
 773                            mmc_hostname(mmc), DRIVER_NAME);
 774         if (host->gpio_card_detect)
 775                 printk("using GPIO %d for card detection\n",
 776                        host->gpio_card_detect);
 777         else
 778                 printk("lacking card detect (fall back to polling)\n");
 779         return 0;
 780
 781 out:
 782         if (host) {
 783                 if (host->irq)
 784                         free_irq(host->irq, host);
 785                 if (host->gpio_card_detect) {
 786                         free_irq(gpio_to_irq(host->gpio_card_detect), host);
 787                         gpio_free(host->gpio_card_detect);
 788                 }
 789                 if (host->gpio_write_protect)
 790                         gpio_free(host->gpio_write_protect);
 791                 if (host->base)
 792                         iounmap(host->base);
 793         }
 794         if (r)
 795                 release_resource(r);
 796         if (mmc)
 797                 mmc_free_host(mmc);
 798
 799         return ret;
 800 }
 801
 802 static int __exit mvsd_remove(struct platform_device *pdev)
 803 {
 804         struct mmc_host *mmc = platform_get_drvdata(pdev);
 805
 806         if (mmc) {
 807                 struct mvsd_host *host = mmc_priv(mmc);
 808
 809                 if (host->gpio_card_detect) {
 810                         free_irq(gpio_to_irq(host->gpio_card_detect), host);
 811                         gpio_free(host->gpio_card_detect);
 812                 }
 813                 mmc_remove_host(mmc);
 814                 free_irq(host->irq, host);
 815                 if (host->gpio_write_protect)
 816                         gpio_free(host->gpio_write_protect);
 817                 del_timer_sync(&host->timer);
 818                 mvsd_power_down(host);
 819                 iounmap(host->base);
 820                 release_resource(host->res);
 821                 mmc_free_host(mmc);
 822         }
 823         platform_set_drvdata(pdev, NULL);
 824         return 0;
 825 }
 826
 827 #ifdef CONFIG_PM
 828 static int mvsd_suspend(struct platform_device *dev, pm_message_t state,
 829                            u32 level)
 830 {
 831         struct mmc_host *mmc = platform_get_drvdata(dev);
 832         int ret = 0;
 833
 834         if (mmc && level == SUSPEND_DISABLE)
 835                 ret = mmc_suspend_host(mmc, state);
 836
 837         return ret;
 838 }
 839
 840 static int mvsd_resume(struct platform_device *dev, u32 level)
 841 {
 842         struct mmc_host *mmc = platform_dev_get_drvdata(dev);
 843         int ret = 0;
 844
 845         if (mmc && level == RESUME_ENABLE)
 846                 ret = mmc_resume_host(mmc);
 847
 848         return ret;
 849 }
 850 #else
 851 #define mvsd_suspend    NULL
 852 #define mvsd_resume     NULL
 853 #endif
 854
 855 static struct platform_driver mvsd_driver = {
 856         .remove         = __exit_p(mvsd_remove),
 857         .suspend        = mvsd_suspend,
 858         .resume         = mvsd_resume,
 859         .driver         = {
 860                 .name   = DRIVER_NAME,
 861         },
 862 };
 863
 864 static int __init mvsd_init(void)
 865 {
 866         return platform_driver_probe(&mvsd_driver, mvsd_probe);
 867 }
 868
 869 static void __exit mvsd_exit(void)
 870 {
 871         platform_driver_unregister(&mvsd_driver);
 872 }
 873
 874 module_init(mvsd_init);
 875 module_exit(mvsd_exit);
 876
 877 /* maximum card clock frequency (default 50MHz) */
 878 module_param(maxfreq, int, 0);
 879
 880 /* force PIO transfers all the time */
 881 module_param(nodma, int, 0);
 882
 883 MODULE_AUTHOR("Maen Suleiman, Nicolas Pitre");
 884 MODULE_DESCRIPTION("Marvell MMC,SD,SDIO Host Controller driver");
 885 MODULE_LICENSE("GPL");