drivers/mmc/host/cb710-mmc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  cb710/mmc.c
   4  *
   5  *  Copyright by Michał Mirosław, 2008-2009
   6  */
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/pci.h>
  10 #include <linux/delay.h>
  11 #include "cb710-mmc.h"
  12
  13 #define CB710_MMC_REQ_TIMEOUT_MS        2000
  14
  15 static const u8 cb710_clock_divider_log2[8] = {
  16 /*      1, 2, 4, 8, 16, 32, 128, 512 */
  17         0, 1, 2, 3,  4,  5,   7,   9
  18 };
  19 #define CB710_MAX_DIVIDER_IDX   \
  20         (ARRAY_SIZE(cb710_clock_divider_log2) - 1)
  21
  22 static const u8 cb710_src_freq_mhz[16] = {
  23         33, 10, 20, 25, 30, 35, 40, 45,
  24         50, 55, 60, 65, 70, 75, 80, 85
  25 };
  26
  27 static void cb710_mmc_select_clock_divider(struct mmc_host *mmc, int hz)
  28 {
  29         struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
  30         struct pci_dev *pdev = cb710_slot_to_chip(slot)->pdev;
  31         u32 src_freq_idx;
  32         u32 divider_idx;
  33         int src_hz;
  34
  35         /* on CB710 in HP nx9500:
  36          *   src_freq_idx == 0
  37          *   indexes 1-7 work as written in the table
  38          *   indexes 0,8-15 give no clock output
  39          */
  40         pci_read_config_dword(pdev, 0x48, &src_freq_idx);
  41         src_freq_idx = (src_freq_idx >> 16) & 0xF;
  42         src_hz = cb710_src_freq_mhz[src_freq_idx] * 1000000;
  43
  44         for (divider_idx = 0; divider_idx < CB710_MAX_DIVIDER_IDX; ++divider_idx) {
  45                 if (hz >= src_hz >> cb710_clock_divider_log2[divider_idx])
  46                         break;
  47         }
  48
  49         if (src_freq_idx)
  50                 divider_idx |= 0x8;
  51         else if (divider_idx == 0)
  52                 divider_idx = 1;
  53
  54         cb710_pci_update_config_reg(pdev, 0x40, ~0xF0000000, divider_idx << 28);
  55
  56         dev_dbg(cb710_slot_dev(slot),
  57                 "clock set to %d Hz, wanted %d Hz; src_freq_idx = %d, divider_idx = %d|%d\n",
  58                 src_hz >> cb710_clock_divider_log2[divider_idx & 7],
  59                 hz, src_freq_idx, divider_idx & 7, divider_idx & 8);
  60 }
  61
  62 static void __cb710_mmc_enable_irq(struct cb710_slot *slot,
  63         unsigned short enable, unsigned short mask)
  64 {
  65         /* clear global IE
  66          * - it gets set later if any interrupt sources are enabled */
  67         mask |= CB710_MMC_IE_IRQ_ENABLE;
  68
  69         /* look like interrupt is fired whenever
  70          * WORD[0x0C] & WORD[0x10] != 0;
  71          * -> bit 15 port 0x0C seems to be global interrupt enable
  72          */
  73
  74         enable = (cb710_read_port_16(slot, CB710_MMC_IRQ_ENABLE_PORT)
  75                 & ~mask) | enable;
  76
  77         if (enable)
  78                 enable |= CB710_MMC_IE_IRQ_ENABLE;
  79
  80         cb710_write_port_16(slot, CB710_MMC_IRQ_ENABLE_PORT, enable);
  81 }
  82
  83 static void cb710_mmc_enable_irq(struct cb710_slot *slot,
  84         unsigned short enable, unsigned short mask)
  85 {
  86         struct cb710_mmc_reader *reader = mmc_priv(cb710_slot_to_mmc(slot));
  87         unsigned long flags;
  88
  89         spin_lock_irqsave(&reader->irq_lock, flags);
  90         /* this is the only thing irq_lock protects */
  91         __cb710_mmc_enable_irq(slot, enable, mask);
  92         spin_unlock_irqrestore(&reader->irq_lock, flags);
  93 }
  94
  95 static void cb710_mmc_reset_events(struct cb710_slot *slot)
  96 {
  97         cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT, 0xFF);
  98         cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT, 0xFF);
  99         cb710_write_port_8(slot, CB710_MMC_STATUS2_PORT, 0xFF);
 100 }
 101
 102 static void cb710_mmc_enable_4bit_data(struct cb710_slot *slot, int enable)
 103 {
 104         if (enable)
 105                 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT,
 106                         CB710_MMC_C1_4BIT_DATA_BUS, 0);
 107         else
 108                 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT,
 109                         0, CB710_MMC_C1_4BIT_DATA_BUS);
 110 }
 111
 112 static int cb710_check_event(struct cb710_slot *slot, u8 what)
 113 {
 114         u16 status;
 115
 116         status = cb710_read_port_16(slot, CB710_MMC_STATUS_PORT);
 117
 118         if (status & CB710_MMC_S0_FIFO_UNDERFLOW) {
 119                 /* it is just a guess, so log it */
 120                 dev_dbg(cb710_slot_dev(slot),
 121                         "CHECK : ignoring bit 6 in status %04X\n", status);
 122                 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT,
 123                         CB710_MMC_S0_FIFO_UNDERFLOW);
 124                 status &= ~CB710_MMC_S0_FIFO_UNDERFLOW;
 125         }
 126
 127         if (status & CB710_MMC_STATUS_ERROR_EVENTS) {
 128                 dev_dbg(cb710_slot_dev(slot),
 129                         "CHECK : returning EIO on status %04X\n", status);
 130                 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT, status & 0xFF);
 131                 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT,
 132                         CB710_MMC_S1_RESET);
 133                 return -EIO;
 134         }
 135
 136         /* 'what' is a bit in MMC_STATUS1 */
 137         if ((status >> 8) & what) {
 138                 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT, what);
 139                 return 1;
 140         }
 141
 142         return 0;
 143 }
 144
 145 static int cb710_wait_for_event(struct cb710_slot *slot, u8 what)
 146 {
 147         int err = 0;
 148         unsigned limit = 2000000;       /* FIXME: real timeout */
 149
 150 #ifdef CONFIG_CB710_DEBUG
 151         u32 e, x;
 152         e = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
 153 #endif
 154
 155         while (!(err = cb710_check_event(slot, what))) {
 156                 if (!--limit) {
 157                         cb710_dump_regs(cb710_slot_to_chip(slot),
 158                                 CB710_DUMP_REGS_MMC);
 159                         err = -ETIMEDOUT;
 160                         break;
 161                 }
 162                 udelay(1);
 163         }
 164
 165 #ifdef CONFIG_CB710_DEBUG
 166         x = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
 167
 168         limit = 2000000 - limit;
 169         if (limit > 100)
 170                 dev_dbg(cb710_slot_dev(slot),
 171                         "WAIT10: waited %d loops, what %d, entry val %08X, exit val %08X\n",
 172                         limit, what, e, x);
 173 #endif
 174         return err < 0 ? err : 0;
 175 }
 176
 177
 178 static int cb710_wait_while_busy(struct cb710_slot *slot, uint8_t mask)
 179 {
 180         unsigned limit = 500000;        /* FIXME: real timeout */
 181         int err = 0;
 182
 183 #ifdef CONFIG_CB710_DEBUG
 184         u32 e, x;
 185         e = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
 186 #endif
 187
 188         while (cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT) & mask) {
 189                 if (!--limit) {
 190                         cb710_dump_regs(cb710_slot_to_chip(slot),
 191                                 CB710_DUMP_REGS_MMC);
 192                         err = -ETIMEDOUT;
 193                         break;
 194                 }
 195                 udelay(1);
 196         }
 197
 198 #ifdef CONFIG_CB710_DEBUG
 199         x = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
 200
 201         limit = 500000 - limit;
 202         if (limit > 100)
 203                 dev_dbg(cb710_slot_dev(slot),
 204                         "WAIT12: waited %d loops, mask %02X, entry val %08X, exit val %08X\n",
 205                         limit, mask, e, x);
 206 #endif
 207         return err;
 208 }
 209
 210 static void cb710_mmc_set_transfer_size(struct cb710_slot *slot,
 211         size_t count, size_t blocksize)
 212 {
 213         cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
 214         cb710_write_port_32(slot, CB710_MMC_TRANSFER_SIZE_PORT,
 215                 ((count - 1) << 16)|(blocksize - 1));
 216
 217         dev_vdbg(cb710_slot_dev(slot), "set up for %zu block%s of %zu bytes\n",
 218                 count, count == 1 ? "" : "s", blocksize);
 219 }
 220
 221 static void cb710_mmc_fifo_hack(struct cb710_slot *slot)
 222 {
 223         /* without this, received data is prepended with 8-bytes of zeroes */
 224         u32 r1, r2;
 225         int ok = 0;
 226
 227         r1 = cb710_read_port_32(slot, CB710_MMC_DATA_PORT);
 228         r2 = cb710_read_port_32(slot, CB710_MMC_DATA_PORT);
 229         if (cb710_read_port_8(slot, CB710_MMC_STATUS0_PORT)
 230             & CB710_MMC_S0_FIFO_UNDERFLOW) {
 231                 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT,
 232                         CB710_MMC_S0_FIFO_UNDERFLOW);
 233                 ok = 1;
 234         }
 235
 236         dev_dbg(cb710_slot_dev(slot),
 237                 "FIFO-read-hack: expected STATUS0 bit was %s\n",
 238                 ok ? "set." : "NOT SET!");
 239         dev_dbg(cb710_slot_dev(slot),
 240                 "FIFO-read-hack: dwords ignored: %08X %08X - %s\n",
 241                 r1, r2, (r1|r2) ? "BAD (NOT ZERO)!" : "ok");
 242 }
 243
 244 static int cb710_mmc_receive_pio(struct cb710_slot *slot,
 245         struct sg_mapping_iter *miter, size_t dw_count)
 246 {
 247         if (!(cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT) & CB710_MMC_S2_FIFO_READY)) {
 248                 int err = cb710_wait_for_event(slot,
 249                         CB710_MMC_S1_PIO_TRANSFER_DONE);
 250                 if (err)
 251                         return err;
 252         }
 253
 254         cb710_sg_dwiter_write_from_io(miter,
 255                 slot->iobase + CB710_MMC_DATA_PORT, dw_count);
 256
 257         return 0;
 258 }
 259
 260 static bool cb710_is_transfer_size_supported(struct mmc_data *data)
 261 {
 262         return !(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8));
 263 }
 264
 265 static int cb710_mmc_receive(struct cb710_slot *slot, struct mmc_data *data)
 266 {
 267         struct sg_mapping_iter miter;
 268         size_t len, blocks = data->blocks;
 269         int err = 0;
 270
 271         /* TODO: I don't know how/if the hardware handles non-16B-boundary blocks
 272          * except single 8B block */
 273         if (unlikely(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8)))
 274                 return -EINVAL;
 275
 276         sg_miter_start(&miter, data->sg, data->sg_len, SG_MITER_TO_SG);
 277
 278         cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
 279                 15, CB710_MMC_C2_READ_PIO_SIZE_MASK);
 280
 281         cb710_mmc_fifo_hack(slot);
 282
 283         while (blocks-- > 0) {
 284                 len = data->blksz;
 285
 286                 while (len >= 16) {
 287                         err = cb710_mmc_receive_pio(slot, &miter, 4);
 288                         if (err)
 289                                 goto out;
 290                         len -= 16;
 291                 }
 292
 293                 if (!len)
 294                         continue;
 295
 296                 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
 297                         len - 1, CB710_MMC_C2_READ_PIO_SIZE_MASK);
 298
 299                 len = (len >= 8) ? 4 : 2;
 300                 err = cb710_mmc_receive_pio(slot, &miter, len);
 301                 if (err)
 302                         goto out;
 303         }
 304 out:
 305         sg_miter_stop(&miter);
 306         return err;
 307 }
 308
 309 static int cb710_mmc_send(struct cb710_slot *slot, struct mmc_data *data)
 310 {
 311         struct sg_mapping_iter miter;
 312         size_t len, blocks = data->blocks;
 313         int err = 0;
 314
 315         /* TODO: I don't know how/if the hardware handles multiple
 316          * non-16B-boundary blocks */
 317         if (unlikely(data->blocks > 1 && data->blksz & 15))
 318                 return -EINVAL;
 319
 320         sg_miter_start(&miter, data->sg, data->sg_len, SG_MITER_FROM_SG);
 321
 322         cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
 323                 0, CB710_MMC_C2_READ_PIO_SIZE_MASK);
 324
 325         while (blocks-- > 0) {
 326                 len = (data->blksz + 15) >> 4;
 327                 do {
 328                         if (!(cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT)
 329                             & CB710_MMC_S2_FIFO_EMPTY)) {
 330                                 err = cb710_wait_for_event(slot,
 331                                         CB710_MMC_S1_PIO_TRANSFER_DONE);
 332                                 if (err)
 333                                         goto out;
 334                         }
 335                         cb710_sg_dwiter_read_to_io(&miter,
 336                                 slot->iobase + CB710_MMC_DATA_PORT, 4);
 337                 } while (--len);
 338         }
 339 out:
 340         sg_miter_stop(&miter);
 341         return err;
 342 }
 343
 344 static u16 cb710_encode_cmd_flags(struct cb710_mmc_reader *reader,
 345         struct mmc_command *cmd)
 346 {
 347         unsigned int flags = cmd->flags;
 348         u16 cb_flags = 0;
 349
 350         /* Windows driver returned 0 for commands for which no response
 351          * is expected. It happened that there were only two such commands
 352          * used: MMC_GO_IDLE_STATE and MMC_GO_INACTIVE_STATE so it might
 353          * as well be a bug in that driver.
 354          *
 355          * Original driver set bit 14 for MMC/SD application
 356          * commands. There's no difference 'on the wire' and
 357          * it apparently works without it anyway.
 358          */
 359
 360         switch (flags & MMC_CMD_MASK) {
 361         case MMC_CMD_AC:        cb_flags = CB710_MMC_CMD_AC;    break;
 362         case MMC_CMD_ADTC:      cb_flags = CB710_MMC_CMD_ADTC;  break;
 363         case MMC_CMD_BC:        cb_flags = CB710_MMC_CMD_BC;    break;
 364         case MMC_CMD_BCR:       cb_flags = CB710_MMC_CMD_BCR;   break;
 365         }
 366
 367         if (flags & MMC_RSP_BUSY)
 368                 cb_flags |= CB710_MMC_RSP_BUSY;
 369
 370         cb_flags |= cmd->opcode << CB710_MMC_CMD_CODE_SHIFT;
 371
 372         if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
 373                 cb_flags |= CB710_MMC_DATA_READ;
 374
 375         if (flags & MMC_RSP_PRESENT) {
 376                 /* Windows driver set 01 at bits 4,3 except for
 377                  * MMC_SET_BLOCKLEN where it set 10. Maybe the
 378                  * hardware can do something special about this
 379                  * command? The original driver looks buggy/incomplete
 380                  * anyway so we ignore this for now.
 381                  *
 382                  * I assume that 00 here means no response is expected.
 383                  */
 384                 cb_flags |= CB710_MMC_RSP_PRESENT;
 385
 386                 if (flags & MMC_RSP_136)
 387                         cb_flags |= CB710_MMC_RSP_136;
 388                 if (!(flags & MMC_RSP_CRC))
 389                         cb_flags |= CB710_MMC_RSP_NO_CRC;
 390         }
 391
 392         return cb_flags;
 393 }
 394
 395 static void cb710_receive_response(struct cb710_slot *slot,
 396         struct mmc_command *cmd)
 397 {
 398         unsigned rsp_opcode, wanted_opcode;
 399
 400         /* Looks like final byte with CRC is always stripped (same as SDHCI) */
 401         if (cmd->flags & MMC_RSP_136) {
 402                 u32 resp[4];
 403
 404                 resp[0] = cb710_read_port_32(slot, CB710_MMC_RESPONSE3_PORT);
 405                 resp[1] = cb710_read_port_32(slot, CB710_MMC_RESPONSE2_PORT);
 406                 resp[2] = cb710_read_port_32(slot, CB710_MMC_RESPONSE1_PORT);
 407                 resp[3] = cb710_read_port_32(slot, CB710_MMC_RESPONSE0_PORT);
 408                 rsp_opcode = resp[0] >> 24;
 409
 410                 cmd->resp[0] = (resp[0] << 8)|(resp[1] >> 24);
 411                 cmd->resp[1] = (resp[1] << 8)|(resp[2] >> 24);
 412                 cmd->resp[2] = (resp[2] << 8)|(resp[3] >> 24);
 413                 cmd->resp[3] = (resp[3] << 8);
 414         } else {
 415                 rsp_opcode = cb710_read_port_32(slot, CB710_MMC_RESPONSE1_PORT) & 0x3F;
 416                 cmd->resp[0] = cb710_read_port_32(slot, CB710_MMC_RESPONSE0_PORT);
 417         }
 418
 419         wanted_opcode = (cmd->flags & MMC_RSP_OPCODE) ? cmd->opcode : 0x3F;
 420         if (rsp_opcode != wanted_opcode)
 421                 cmd->error = -EILSEQ;
 422 }
 423
 424 static int cb710_mmc_transfer_data(struct cb710_slot *slot,
 425         struct mmc_data *data)
 426 {
 427         int error, to;
 428
 429         if (data->flags & MMC_DATA_READ)
 430                 error = cb710_mmc_receive(slot, data);
 431         else
 432                 error = cb710_mmc_send(slot, data);
 433
 434         to = cb710_wait_for_event(slot, CB710_MMC_S1_DATA_TRANSFER_DONE);
 435         if (!error)
 436                 error = to;
 437
 438         if (!error)
 439                 data->bytes_xfered = data->blksz * data->blocks;
 440         return error;
 441 }
 442
 443 static int cb710_mmc_command(struct mmc_host *mmc, struct mmc_command *cmd)
 444 {
 445         struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
 446         struct cb710_mmc_reader *reader = mmc_priv(mmc);
 447         struct mmc_data *data = cmd->data;
 448
 449         u16 cb_cmd = cb710_encode_cmd_flags(reader, cmd);
 450         dev_dbg(cb710_slot_dev(slot), "cmd request: 0x%04X\n", cb_cmd);
 451
 452         if (data) {
 453                 if (!cb710_is_transfer_size_supported(data)) {
 454                         data->error = -EINVAL;
 455                         return -1;
 456                 }
 457                 cb710_mmc_set_transfer_size(slot, data->blocks, data->blksz);
 458         }
 459
 460         cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20|CB710_MMC_S2_BUSY_10);
 461         cb710_write_port_16(slot, CB710_MMC_CMD_TYPE_PORT, cb_cmd);
 462         cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
 463         cb710_write_port_32(slot, CB710_MMC_CMD_PARAM_PORT, cmd->arg);
 464         cb710_mmc_reset_events(slot);
 465         cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
 466         cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x01, 0);
 467
 468         cmd->error = cb710_wait_for_event(slot, CB710_MMC_S1_COMMAND_SENT);
 469         if (cmd->error)
 470                 return -1;
 471
 472         if (cmd->flags & MMC_RSP_PRESENT) {
 473                 cb710_receive_response(slot, cmd);
 474                 if (cmd->error)
 475                         return -1;
 476         }
 477
 478         if (data)
 479                 data->error = cb710_mmc_transfer_data(slot, data);
 480         return 0;
 481 }
 482
 483 static void cb710_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 484 {
 485         struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
 486         struct cb710_mmc_reader *reader = mmc_priv(mmc);
 487
 488         WARN_ON(reader->mrq != NULL);
 489
 490         reader->mrq = mrq;
 491         cb710_mmc_enable_irq(slot, CB710_MMC_IE_TEST_MASK, 0);
 492
 493         if (!cb710_mmc_command(mmc, mrq->cmd) && mrq->stop)
 494                 cb710_mmc_command(mmc, mrq->stop);
 495
 496         tasklet_schedule(&reader->finish_req_tasklet);
 497 }
 498
 499 static int cb710_mmc_powerup(struct cb710_slot *slot)
 500 {
 501 #ifdef CONFIG_CB710_DEBUG
 502         struct cb710_chip *chip = cb710_slot_to_chip(slot);
 503 #endif
 504         int err;
 505
 506         /* a lot of magic for now */
 507         dev_dbg(cb710_slot_dev(slot), "bus powerup\n");
 508         cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
 509         err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
 510         if (unlikely(err))
 511                 return err;
 512         cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x80, 0);
 513         cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0x80, 0);
 514         cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
 515         mdelay(1);
 516         dev_dbg(cb710_slot_dev(slot), "after delay 1\n");
 517         cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
 518         err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
 519         if (unlikely(err))
 520                 return err;
 521         cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x09, 0);
 522         cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
 523         mdelay(1);
 524         dev_dbg(cb710_slot_dev(slot), "after delay 2\n");
 525         cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
 526         err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
 527         if (unlikely(err))
 528                 return err;
 529         cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0, 0x08);
 530         cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
 531         mdelay(2);
 532         dev_dbg(cb710_slot_dev(slot), "after delay 3\n");
 533         cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
 534         cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x06, 0);
 535         cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x70, 0);
 536         cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT, 0x80, 0);
 537         cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0x03, 0);
 538         cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
 539         err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
 540         if (unlikely(err))
 541                 return err;
 542         /* This port behaves weird: quick byte reads of 0x08,0x09 return
 543          * 0xFF,0x00 after writing 0xFFFF to 0x08; it works correctly when
 544          * read/written from userspace...  What am I missing here?
 545          * (it doesn't depend on write-to-read delay) */
 546         cb710_write_port_16(slot, CB710_MMC_CONFIGB_PORT, 0xFFFF);
 547         cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x06, 0);
 548         cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
 549         dev_dbg(cb710_slot_dev(slot), "bus powerup finished\n");
 550
 551         return cb710_check_event(slot, 0);
 552 }
 553
 554 static void cb710_mmc_powerdown(struct cb710_slot *slot)
 555 {
 556         cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0, 0x81);
 557         cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0, 0x80);
 558 }
 559
 560 static void cb710_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 561 {
 562         struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
 563         struct cb710_mmc_reader *reader = mmc_priv(mmc);
 564         int err;
 565
 566         cb710_mmc_select_clock_divider(mmc, ios->clock);
 567
 568         if (ios->power_mode != reader->last_power_mode) {
 569                 switch (ios->power_mode) {
 570                 case MMC_POWER_ON:
 571                         err = cb710_mmc_powerup(slot);
 572                         if (err) {
 573                                 dev_warn(cb710_slot_dev(slot),
 574                                         "powerup failed (%d)- retrying\n", err);
 575                                 cb710_mmc_powerdown(slot);
 576                                 udelay(1);
 577                                 err = cb710_mmc_powerup(slot);
 578                                 if (err)
 579                                         dev_warn(cb710_slot_dev(slot),
 580                                                 "powerup retry failed (%d) - expect errors\n",
 581                                         err);
 582                         }
 583                         reader->last_power_mode = MMC_POWER_ON;
 584                         break;
 585                 case MMC_POWER_OFF:
 586                         cb710_mmc_powerdown(slot);
 587                         reader->last_power_mode = MMC_POWER_OFF;
 588                         break;
 589                 case MMC_POWER_UP:
 590                 default:
 591                         /* ignore */
 592                         break;
 593                 }
 594         }
 595
 596         cb710_mmc_enable_4bit_data(slot, ios->bus_width != MMC_BUS_WIDTH_1);
 597
 598         cb710_mmc_enable_irq(slot, CB710_MMC_IE_TEST_MASK, 0);
 599 }
 600
 601 static int cb710_mmc_get_ro(struct mmc_host *mmc)
 602 {
 603         struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
 604
 605         return cb710_read_port_8(slot, CB710_MMC_STATUS3_PORT)
 606                 & CB710_MMC_S3_WRITE_PROTECTED;
 607 }
 608
 609 static int cb710_mmc_get_cd(struct mmc_host *mmc)
 610 {
 611         struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
 612
 613         return cb710_read_port_8(slot, CB710_MMC_STATUS3_PORT)
 614                 & CB710_MMC_S3_CARD_DETECTED;
 615 }
 616
 617 static int cb710_mmc_irq_handler(struct cb710_slot *slot)
 618 {
 619         struct mmc_host *mmc = cb710_slot_to_mmc(slot);
 620         struct cb710_mmc_reader *reader = mmc_priv(mmc);
 621         u32 status, config1, config2, irqen;
 622
 623         status = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
 624         irqen = cb710_read_port_32(slot, CB710_MMC_IRQ_ENABLE_PORT);
 625         config2 = cb710_read_port_32(slot, CB710_MMC_CONFIGB_PORT);
 626         config1 = cb710_read_port_32(slot, CB710_MMC_CONFIG_PORT);
 627
 628         dev_dbg(cb710_slot_dev(slot), "interrupt; status: %08X, "
 629                 "ie: %08X, c2: %08X, c1: %08X\n",
 630                 status, irqen, config2, config1);
 631
 632         if (status & (CB710_MMC_S1_CARD_CHANGED << 8)) {
 633                 /* ack the event */
 634                 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT,
 635                         CB710_MMC_S1_CARD_CHANGED);
 636                 if ((irqen & CB710_MMC_IE_CISTATUS_MASK)
 637                     == CB710_MMC_IE_CISTATUS_MASK)
 638                         mmc_detect_change(mmc, HZ/5);
 639         } else {
 640                 dev_dbg(cb710_slot_dev(slot), "unknown interrupt (test)\n");
 641                 spin_lock(&reader->irq_lock);
 642                 __cb710_mmc_enable_irq(slot, 0, CB710_MMC_IE_TEST_MASK);
 643                 spin_unlock(&reader->irq_lock);
 644         }
 645
 646         return 1;
 647 }
 648
 649 static void cb710_mmc_finish_request_tasklet(struct tasklet_struct *t)
 650 {
 651         struct cb710_mmc_reader *reader = from_tasklet(reader, t,
 652                                                        finish_req_tasklet);
 653         struct mmc_request *mrq = reader->mrq;
 654
 655         reader->mrq = NULL;
 656         mmc_request_done(mmc_from_priv(reader), mrq);
 657 }
 658
 659 static const struct mmc_host_ops cb710_mmc_host = {
 660         .request = cb710_mmc_request,
 661         .set_ios = cb710_mmc_set_ios,
 662         .get_ro = cb710_mmc_get_ro,
 663         .get_cd = cb710_mmc_get_cd,
 664 };
 665
 666 #ifdef CONFIG_PM
 667
 668 static int cb710_mmc_suspend(struct platform_device *pdev, pm_message_t state)
 669 {
 670         struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
 671
 672         cb710_mmc_enable_irq(slot, 0, ~0);
 673         return 0;
 674 }
 675
 676 static int cb710_mmc_resume(struct platform_device *pdev)
 677 {
 678         struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
 679
 680         cb710_mmc_enable_irq(slot, 0, ~0);
 681         return 0;
 682 }
 683
 684 #endif /* CONFIG_PM */
 685
 686 static int cb710_mmc_init(struct platform_device *pdev)
 687 {
 688         struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
 689         struct cb710_chip *chip = cb710_slot_to_chip(slot);
 690         struct mmc_host *mmc;
 691         struct cb710_mmc_reader *reader;
 692         int err;
 693         u32 val;
 694
 695         mmc = mmc_alloc_host(sizeof(*reader), cb710_slot_dev(slot));
 696         if (!mmc)
 697                 return -ENOMEM;
 698
 699         platform_set_drvdata(pdev, mmc);
 700
 701         /* harmless (maybe) magic */
 702         pci_read_config_dword(chip->pdev, 0x48, &val);
 703         val = cb710_src_freq_mhz[(val >> 16) & 0xF];
 704         dev_dbg(cb710_slot_dev(slot), "source frequency: %dMHz\n", val);
 705         val *= 1000000;
 706
 707         mmc->ops = &cb710_mmc_host;
 708         mmc->f_max = val;
 709         mmc->f_min = val >> cb710_clock_divider_log2[CB710_MAX_DIVIDER_IDX];
 710         mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
 711         mmc->caps = MMC_CAP_4_BIT_DATA;
 712         /*
 713          * In cb710_wait_for_event() we use a fixed timeout of ~2s, hence let's
 714          * inform the core about it. A future improvement should instead make
 715          * use of the cmd->busy_timeout.
 716          */
 717         mmc->max_busy_timeout = CB710_MMC_REQ_TIMEOUT_MS;
 718
 719         reader = mmc_priv(mmc);
 720
 721         tasklet_setup(&reader->finish_req_tasklet,
 722                       cb710_mmc_finish_request_tasklet);
 723         spin_lock_init(&reader->irq_lock);
 724         cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
 725
 726         cb710_mmc_enable_irq(slot, 0, ~0);
 727         cb710_set_irq_handler(slot, cb710_mmc_irq_handler);
 728
 729         err = mmc_add_host(mmc);
 730         if (unlikely(err))
 731                 goto err_free_mmc;
 732
 733         dev_dbg(cb710_slot_dev(slot), "mmc_hostname is %s\n",
 734                 mmc_hostname(mmc));
 735
 736         cb710_mmc_enable_irq(slot, CB710_MMC_IE_CARD_INSERTION_STATUS, 0);
 737
 738         return 0;
 739
 740 err_free_mmc:
 741         dev_dbg(cb710_slot_dev(slot), "mmc_add_host() failed: %d\n", err);
 742
 743         cb710_set_irq_handler(slot, NULL);
 744         mmc_free_host(mmc);
 745         return err;
 746 }
 747
 748 static void cb710_mmc_exit(struct platform_device *pdev)
 749 {
 750         struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
 751         struct mmc_host *mmc = cb710_slot_to_mmc(slot);
 752         struct cb710_mmc_reader *reader = mmc_priv(mmc);
 753
 754         cb710_mmc_enable_irq(slot, 0, CB710_MMC_IE_CARD_INSERTION_STATUS);
 755
 756         mmc_remove_host(mmc);
 757
 758         /* IRQs should be disabled now, but let's stay on the safe side */
 759         cb710_mmc_enable_irq(slot, 0, ~0);
 760         cb710_set_irq_handler(slot, NULL);
 761
 762         /* clear config ports - just in case */
 763         cb710_write_port_32(slot, CB710_MMC_CONFIG_PORT, 0);
 764         cb710_write_port_16(slot, CB710_MMC_CONFIGB_PORT, 0);
 765
 766         tasklet_kill(&reader->finish_req_tasklet);
 767
 768         mmc_free_host(mmc);
 769 }
 770
 771 static struct platform_driver cb710_mmc_driver = {
 772         .driver.name = "cb710-mmc",
 773         .probe = cb710_mmc_init,
 774         .remove_new = cb710_mmc_exit,
 775 #ifdef CONFIG_PM
 776         .suspend = cb710_mmc_suspend,
 777         .resume = cb710_mmc_resume,
 778 #endif
 779 };
 780
 781 module_platform_driver(cb710_mmc_driver);
 782
 783 MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
 784 MODULE_DESCRIPTION("ENE CB710 memory card reader driver - MMC/SD part");
 785 MODULE_LICENSE("GPL");
 786 MODULE_ALIAS("platform:cb710-mmc");