drivers/mmc/imxmmc.c

   1 /*
   2  *  linux/drivers/mmc/imxmmc.c - Motorola i.MX MMCI driver
   3  *
   4  *  Copyright (C) 2004 Sascha Hauer, Pengutronix <sascha@saschahauer.de>
   5  *  Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com>
   6  *
   7  *  derived from pxamci.c by Russell King
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  *  2005-04-17 Pavel Pisa <pisa@cmp.felk.cvut.cz>
  14  *             Changed to conform redesigned i.MX scatter gather DMA interface
  15  *
  16  *  2005-11-04 Pavel Pisa <pisa@cmp.felk.cvut.cz>
  17  *             Updated for 2.6.14 kernel
  18  *
  19  *  2005-12-13 Jay Monkman <jtm@smoothsmoothie.com>
  20  *             Found and corrected problems in the write path
  21  *
  22  *  2005-12-30 Pavel Pisa <pisa@cmp.felk.cvut.cz>
  23  *             The event handling rewritten right way in softirq.
  24  *             Added many ugly hacks and delays to overcome SDHC
  25  *             deficiencies
  26  *
  27  */
  28
  29 #ifdef CONFIG_MMC_DEBUG
  30 #define DEBUG
  31 #else
  32 #undef  DEBUG
  33 #endif
  34
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/ioport.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/blkdev.h>
  41 #include <linux/dma-mapping.h>
  42 #include <linux/mmc/host.h>
  43 #include <linux/mmc/card.h>
  44 #include <linux/mmc/protocol.h>
  45 #include <linux/delay.h>
  46
  47 #include <asm/dma.h>
  48 #include <asm/io.h>
  49 #include <asm/irq.h>
  50 #include <asm/sizes.h>
  51 #include <asm/arch/mmc.h>
  52 #include <asm/arch/imx-dma.h>
  53
  54 #include "imxmmc.h"
  55
  56 #define DRIVER_NAME "imx-mmc"
  57
  58 #define IMXMCI_INT_MASK_DEFAULT (INT_MASK_BUF_READY | INT_MASK_DATA_TRAN | \
  59                       INT_MASK_WRITE_OP_DONE | INT_MASK_END_CMD_RES | \
  60                       INT_MASK_AUTO_CARD_DETECT | INT_MASK_DAT0_EN | INT_MASK_SDIO)
  61
  62 struct imxmci_host {
  63         struct mmc_host         *mmc;
  64         spinlock_t              lock;
  65         struct resource         *res;
  66         int                     irq;
  67         imx_dmach_t             dma;
  68         unsigned int            clkrt;
  69         unsigned int            cmdat;
  70         volatile unsigned int   imask;
  71         unsigned int            power_mode;
  72         unsigned int            present;
  73         struct imxmmc_platform_data *pdata;
  74
  75         struct mmc_request      *req;
  76         struct mmc_command      *cmd;
  77         struct mmc_data         *data;
  78
  79         struct timer_list       timer;
  80         struct tasklet_struct   tasklet;
  81         unsigned int            status_reg;
  82         unsigned long           pending_events;
  83         /* Next to fields are there for CPU driven transfers to overcome SDHC deficiencies */
  84         u16                     *data_ptr;
  85         unsigned int            data_cnt;
  86         atomic_t                stuck_timeout;
  87
  88         unsigned int            dma_nents;
  89         unsigned int            dma_size;
  90         unsigned int            dma_dir;
  91         int                     dma_allocated;
  92
  93         unsigned char           actual_bus_width;
  94
  95         int                     prev_cmd_code;
  96 };
  97
  98 #define IMXMCI_PEND_IRQ_b       0
  99 #define IMXMCI_PEND_DMA_END_b   1
 100 #define IMXMCI_PEND_DMA_ERR_b   2
 101 #define IMXMCI_PEND_WAIT_RESP_b 3
 102 #define IMXMCI_PEND_DMA_DATA_b  4
 103 #define IMXMCI_PEND_CPU_DATA_b  5
 104 #define IMXMCI_PEND_CARD_XCHG_b 6
 105 #define IMXMCI_PEND_SET_INIT_b  7
 106 #define IMXMCI_PEND_STARTED_b   8
 107
 108 #define IMXMCI_PEND_IRQ_m       (1 << IMXMCI_PEND_IRQ_b)
 109 #define IMXMCI_PEND_DMA_END_m   (1 << IMXMCI_PEND_DMA_END_b)
 110 #define IMXMCI_PEND_DMA_ERR_m   (1 << IMXMCI_PEND_DMA_ERR_b)
 111 #define IMXMCI_PEND_WAIT_RESP_m (1 << IMXMCI_PEND_WAIT_RESP_b)
 112 #define IMXMCI_PEND_DMA_DATA_m  (1 << IMXMCI_PEND_DMA_DATA_b)
 113 #define IMXMCI_PEND_CPU_DATA_m  (1 << IMXMCI_PEND_CPU_DATA_b)
 114 #define IMXMCI_PEND_CARD_XCHG_m (1 << IMXMCI_PEND_CARD_XCHG_b)
 115 #define IMXMCI_PEND_SET_INIT_m  (1 << IMXMCI_PEND_SET_INIT_b)
 116 #define IMXMCI_PEND_STARTED_m   (1 << IMXMCI_PEND_STARTED_b)
 117
 118 static void imxmci_stop_clock(struct imxmci_host *host)
 119 {
 120         int i = 0;
 121         MMC_STR_STP_CLK &= ~STR_STP_CLK_START_CLK;
 122         while(i < 0x1000) {
 123                 if(!(i & 0x7f))
 124                         MMC_STR_STP_CLK |= STR_STP_CLK_STOP_CLK;
 125
 126                 if(!(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)) {
 127                         /* Check twice before cut */
 128                         if(!(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN))
 129                                 return;
 130                 }
 131
 132                 i++;
 133         }
 134         dev_dbg(mmc_dev(host->mmc), "imxmci_stop_clock blocked, no luck\n");
 135 }
 136
 137 static int imxmci_start_clock(struct imxmci_host *host)
 138 {
 139         unsigned int trials = 0;
 140         unsigned int delay_limit = 128;
 141         unsigned long flags;
 142
 143         MMC_STR_STP_CLK &= ~STR_STP_CLK_STOP_CLK;
 144
 145         clear_bit(IMXMCI_PEND_STARTED_b, &host->pending_events);
 146
 147         /*
 148          * Command start of the clock, this usually succeeds in less
 149          * then 6 delay loops, but during card detection (low clockrate)
 150          * it takes up to 5000 delay loops and sometimes fails for the first time
 151          */
 152         MMC_STR_STP_CLK |= STR_STP_CLK_START_CLK;
 153
 154         do {
 155                 unsigned int delay = delay_limit;
 156
 157                 while(delay--){
 158                         if(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)
 159                                 /* Check twice before cut */
 160                                 if(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)
 161                                         return 0;
 162
 163                         if(test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events))
 164                                 return 0;
 165                 }
 166
 167                 local_irq_save(flags);
 168                 /*
 169                  * Ensure, that request is not doubled under all possible circumstances.
 170                  * It is possible, that cock running state is missed, because some other
 171                  * IRQ or schedule delays this function execution and the clocks has
 172                  * been already stopped by other means (response processing, SDHC HW)
 173                  */
 174                 if(!test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events))
 175                         MMC_STR_STP_CLK |= STR_STP_CLK_START_CLK;
 176                 local_irq_restore(flags);
 177
 178         } while(++trials<256);
 179
 180         dev_err(mmc_dev(host->mmc), "imxmci_start_clock blocked, no luck\n");
 181
 182         return -1;
 183 }
 184
 185 static void imxmci_softreset(void)
 186 {
 187         /* reset sequence */
 188         MMC_STR_STP_CLK = 0x8;
 189         MMC_STR_STP_CLK = 0xD;
 190         MMC_STR_STP_CLK = 0x5;
 191         MMC_STR_STP_CLK = 0x5;
 192         MMC_STR_STP_CLK = 0x5;
 193         MMC_STR_STP_CLK = 0x5;
 194         MMC_STR_STP_CLK = 0x5;
 195         MMC_STR_STP_CLK = 0x5;
 196         MMC_STR_STP_CLK = 0x5;
 197         MMC_STR_STP_CLK = 0x5;
 198
 199         MMC_RES_TO = 0xff;
 200         MMC_BLK_LEN = 512;
 201         MMC_NOB = 1;
 202 }
 203
 204 static int imxmci_busy_wait_for_status(struct imxmci_host *host,
 205                         unsigned int *pstat, unsigned int stat_mask,
 206                         int timeout, const char *where)
 207 {
 208         int loops=0;
 209         while(!(*pstat & stat_mask)) {
 210                 loops+=2;
 211                 if(loops >= timeout) {
 212                         dev_dbg(mmc_dev(host->mmc), "busy wait timeout in %s, STATUS = 0x%x (0x%x)\n",
 213                                 where, *pstat, stat_mask);
 214                         return -1;
 215                 }
 216                 udelay(2);
 217                 *pstat |= MMC_STATUS;
 218         }
 219         if(!loops)
 220                 return 0;
 221
 222         /* The busy-wait is expected there for clock <8MHz due to SDHC hardware flaws */
 223         if(!(stat_mask & STATUS_END_CMD_RESP) || (host->mmc->ios.clock>=8000000))
 224                 dev_info(mmc_dev(host->mmc), "busy wait for %d usec in %s, STATUS = 0x%x (0x%x)\n",
 225                         loops, where, *pstat, stat_mask);
 226         return loops;
 227 }
 228
 229 static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data)
 230 {
 231         unsigned int nob = data->blocks;
 232         unsigned int blksz = data->blksz;
 233         unsigned int datasz = nob * blksz;
 234         int i;
 235
 236         if (data->flags & MMC_DATA_STREAM)
 237                 nob = 0xffff;
 238
 239         host->data = data;
 240         data->bytes_xfered = 0;
 241
 242         MMC_NOB = nob;
 243         MMC_BLK_LEN = blksz;
 244
 245         /*
 246          * DMA cannot be used for small block sizes, we have to use CPU driven transfers otherwise.
 247          * We are in big troubles for non-512 byte transfers according to note in the paragraph
 248          * 20.6.7 of User Manual anyway, but we need to be able to transfer SCR at least.
 249          * The situation is even more complex in reality. The SDHC in not able to handle wll
 250          * partial FIFO fills and reads. The length has to be rounded up to burst size multiple.
 251          * This is required for SCR read at least.
 252          */
 253         if (datasz < 512) {
 254                 host->dma_size = datasz;
 255                 if (data->flags & MMC_DATA_READ) {
 256                         host->dma_dir = DMA_FROM_DEVICE;
 257
 258                         /* Hack to enable read SCR */
 259                         MMC_NOB = 1;
 260                         MMC_BLK_LEN = 512;
 261                 } else {
 262                         host->dma_dir = DMA_TO_DEVICE;
 263                 }
 264
 265                 /* Convert back to virtual address */
 266                 host->data_ptr = (u16*)(page_address(data->sg->page) + data->sg->offset);
 267                 host->data_cnt = 0;
 268
 269                 clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
 270                 set_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
 271
 272                 return;
 273         }
 274
 275         if (data->flags & MMC_DATA_READ) {
 276                 host->dma_dir = DMA_FROM_DEVICE;
 277                 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
 278                                                 data->sg_len,  host->dma_dir);
 279
 280                 imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
 281                         host->res->start + MMC_BUFFER_ACCESS_OFS, DMA_MODE_READ);
 282
 283                 /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_READ, IMX_DMA_WIDTH_16, CCR_REN);*/
 284                 CCR(host->dma) = CCR_DMOD_LINEAR | CCR_DSIZ_32 | CCR_SMOD_FIFO | CCR_SSIZ_16 | CCR_REN;
 285         } else {
 286                 host->dma_dir = DMA_TO_DEVICE;
 287
 288                 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
 289                                                 data->sg_len,  host->dma_dir);
 290
 291                 imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
 292                         host->res->start + MMC_BUFFER_ACCESS_OFS, DMA_MODE_WRITE);
 293
 294                 /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_WRITE, IMX_DMA_WIDTH_16, CCR_REN);*/
 295                 CCR(host->dma) = CCR_SMOD_LINEAR | CCR_SSIZ_32 | CCR_DMOD_FIFO | CCR_DSIZ_16 | CCR_REN;
 296         }
 297
 298 #if 1   /* This code is there only for consistency checking and can be disabled in future */
 299         host->dma_size = 0;
 300         for(i=0; i<host->dma_nents; i++)
 301                 host->dma_size+=data->sg[i].length;
 302
 303         if (datasz > host->dma_size) {
 304                 dev_err(mmc_dev(host->mmc), "imxmci_setup_data datasz 0x%x > 0x%x dm_size\n",
 305                        datasz, host->dma_size);
 306         }
 307 #endif
 308
 309         host->dma_size = datasz;
 310
 311         wmb();
 312
 313         if(host->actual_bus_width == MMC_BUS_WIDTH_4)
 314                 BLR(host->dma) = 0;     /* burst 64 byte read / 64 bytes write */
 315         else
 316                 BLR(host->dma) = 16;    /* burst 16 byte read / 16 bytes write */
 317
 318         RSSR(host->dma) = DMA_REQ_SDHC;
 319
 320         set_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
 321         clear_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
 322
 323         /* start DMA engine for read, write is delayed after initial response */
 324         if (host->dma_dir == DMA_FROM_DEVICE) {
 325                 imx_dma_enable(host->dma);
 326         }
 327 }
 328
 329 static void imxmci_start_cmd(struct imxmci_host *host, struct mmc_command *cmd, unsigned int cmdat)
 330 {
 331         unsigned long flags;
 332         u32 imask;
 333
 334         WARN_ON(host->cmd != NULL);
 335         host->cmd = cmd;
 336
 337         /* Ensure, that clock are stopped else command programming and start fails */
 338         imxmci_stop_clock(host);
 339
 340         if (cmd->flags & MMC_RSP_BUSY)
 341                 cmdat |= CMD_DAT_CONT_BUSY;
 342
 343         switch (mmc_resp_type(cmd)) {
 344         case MMC_RSP_R1: /* short CRC, OPCODE */
 345         case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
 346                 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R1;
 347                 break;
 348         case MMC_RSP_R2: /* long 136 bit + CRC */
 349                 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R2;
 350                 break;
 351         case MMC_RSP_R3: /* short */
 352                 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R3;
 353                 break;
 354         default:
 355                 break;
 356         }
 357
 358         if ( test_and_clear_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events) )
 359                 cmdat |= CMD_DAT_CONT_INIT; /* This command needs init */
 360
 361         if ( host->actual_bus_width == MMC_BUS_WIDTH_4 )
 362                 cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
 363
 364         MMC_CMD = cmd->opcode;
 365         MMC_ARGH = cmd->arg >> 16;
 366         MMC_ARGL = cmd->arg & 0xffff;
 367         MMC_CMD_DAT_CONT = cmdat;
 368
 369         atomic_set(&host->stuck_timeout, 0);
 370         set_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events);
 371
 372
 373         imask = IMXMCI_INT_MASK_DEFAULT;
 374         imask &= ~INT_MASK_END_CMD_RES;
 375         if ( cmdat & CMD_DAT_CONT_DATA_ENABLE ) {
 376                 /*imask &= ~INT_MASK_BUF_READY;*/
 377                 imask &= ~INT_MASK_DATA_TRAN;
 378                 if ( cmdat & CMD_DAT_CONT_WRITE )
 379                         imask &= ~INT_MASK_WRITE_OP_DONE;
 380                 if(test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events))
 381                         imask &= ~INT_MASK_BUF_READY;
 382         }
 383
 384         spin_lock_irqsave(&host->lock, flags);
 385         host->imask = imask;
 386         MMC_INT_MASK = host->imask;
 387         spin_unlock_irqrestore(&host->lock, flags);
 388
 389         dev_dbg(mmc_dev(host->mmc), "CMD%02d (0x%02x) mask set to 0x%04x\n",
 390                 cmd->opcode, cmd->opcode, imask);
 391
 392         imxmci_start_clock(host);
 393 }
 394
 395 static void imxmci_finish_request(struct imxmci_host *host, struct mmc_request *req)
 396 {
 397         unsigned long flags;
 398
 399         spin_lock_irqsave(&host->lock, flags);
 400
 401         host->pending_events &= ~(IMXMCI_PEND_WAIT_RESP_m | IMXMCI_PEND_DMA_END_m |
 402                         IMXMCI_PEND_DMA_DATA_m | IMXMCI_PEND_CPU_DATA_m);
 403
 404         host->imask = IMXMCI_INT_MASK_DEFAULT;
 405         MMC_INT_MASK = host->imask;
 406
 407         spin_unlock_irqrestore(&host->lock, flags);
 408
 409         if(req && req->cmd)
 410                 host->prev_cmd_code = req->cmd->opcode;
 411
 412         host->req = NULL;
 413         host->cmd = NULL;
 414         host->data = NULL;
 415         mmc_request_done(host->mmc, req);
 416 }
 417
 418 static int imxmci_finish_data(struct imxmci_host *host, unsigned int stat)
 419 {
 420         struct mmc_data *data = host->data;
 421         int data_error;
 422
 423         if(test_and_clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)){
 424                 imx_dma_disable(host->dma);
 425                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents,
 426                              host->dma_dir);
 427         }
 428
 429         if ( stat & STATUS_ERR_MASK ) {
 430                 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n",stat);
 431                 if(stat & (STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR))
 432                         data->error = MMC_ERR_BADCRC;
 433                 else if(stat & STATUS_TIME_OUT_READ)
 434                         data->error = MMC_ERR_TIMEOUT;
 435                 else
 436                         data->error = MMC_ERR_FAILED;
 437         } else {
 438                 data->bytes_xfered = host->dma_size;
 439         }
 440
 441         data_error = data->error;
 442
 443         host->data = NULL;
 444
 445         return data_error;
 446 }
 447
 448 static int imxmci_cmd_done(struct imxmci_host *host, unsigned int stat)
 449 {
 450         struct mmc_command *cmd = host->cmd;
 451         int i;
 452         u32 a,b,c;
 453         struct mmc_data *data = host->data;
 454
 455         if (!cmd)
 456                 return 0;
 457
 458         host->cmd = NULL;
 459
 460         if (stat & STATUS_TIME_OUT_RESP) {
 461                 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
 462                 cmd->error = MMC_ERR_TIMEOUT;
 463         } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
 464                 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
 465                 cmd->error = MMC_ERR_BADCRC;
 466         }
 467
 468         if(cmd->flags & MMC_RSP_PRESENT) {
 469                 if(cmd->flags & MMC_RSP_136) {
 470                         for (i = 0; i < 4; i++) {
 471                                 u32 a = MMC_RES_FIFO & 0xffff;
 472                                 u32 b = MMC_RES_FIFO & 0xffff;
 473                                 cmd->resp[i] = a<<16 | b;
 474                         }
 475                 } else {
 476                         a = MMC_RES_FIFO & 0xffff;
 477                         b = MMC_RES_FIFO & 0xffff;
 478                         c = MMC_RES_FIFO & 0xffff;
 479                         cmd->resp[0] = a<<24 | b<<8 | c>>8;
 480                 }
 481         }
 482
 483         dev_dbg(mmc_dev(host->mmc), "RESP 0x%08x, 0x%08x, 0x%08x, 0x%08x, error %d\n",
 484                 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3], cmd->error);
 485
 486         if (data && (cmd->error == MMC_ERR_NONE) && !(stat & STATUS_ERR_MASK)) {
 487                 if (host->req->data->flags & MMC_DATA_WRITE) {
 488
 489                         /* Wait for FIFO to be empty before starting DMA write */
 490
 491                         stat = MMC_STATUS;
 492                         if(imxmci_busy_wait_for_status(host, &stat,
 493                                 STATUS_APPL_BUFF_FE,
 494                                 40, "imxmci_cmd_done DMA WR") < 0) {
 495                                 cmd->error = MMC_ERR_FIFO;
 496                                 imxmci_finish_data(host, stat);
 497                                 if(host->req)
 498                                         imxmci_finish_request(host, host->req);
 499                                 dev_warn(mmc_dev(host->mmc), "STATUS = 0x%04x\n",
 500                                        stat);
 501                                 return 0;
 502                         }
 503
 504                         if(test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
 505                                 imx_dma_enable(host->dma);
 506                         }
 507                 }
 508         } else {
 509                 struct mmc_request *req;
 510                 imxmci_stop_clock(host);
 511                 req = host->req;
 512
 513                 if(data)
 514                         imxmci_finish_data(host, stat);
 515
 516                 if( req ) {
 517                         imxmci_finish_request(host, req);
 518                 } else {
 519                         dev_warn(mmc_dev(host->mmc), "imxmci_cmd_done: no request to finish\n");
 520                 }
 521         }
 522
 523         return 1;
 524 }
 525
 526 static int imxmci_data_done(struct imxmci_host *host, unsigned int stat)
 527 {
 528         struct mmc_data *data = host->data;
 529         int data_error;
 530
 531         if (!data)
 532                 return 0;
 533
 534         data_error = imxmci_finish_data(host, stat);
 535
 536         if (host->req->stop) {
 537                 imxmci_stop_clock(host);
 538                 imxmci_start_cmd(host, host->req->stop, 0);
 539         } else {
 540                 struct mmc_request *req;
 541                 req = host->req;
 542                 if( req ) {
 543                         imxmci_finish_request(host, req);
 544                 } else {
 545                         dev_warn(mmc_dev(host->mmc), "imxmci_data_done: no request to finish\n");
 546                 }
 547         }
 548
 549         return 1;
 550 }
 551
 552 static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
 553 {
 554         int i;
 555         int burst_len;
 556         int trans_done = 0;
 557         unsigned int stat = *pstat;
 558
 559         if(host->actual_bus_width != MMC_BUS_WIDTH_4)
 560                 burst_len = 16;
 561         else
 562                 burst_len = 64;
 563
 564         /* This is unfortunately required */
 565         dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data running STATUS = 0x%x\n",
 566                 stat);
 567
 568         udelay(20);     /* required for clocks < 8MHz*/
 569
 570         if(host->dma_dir == DMA_FROM_DEVICE) {
 571                 imxmci_busy_wait_for_status(host, &stat,
 572                                 STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE,
 573                                 50, "imxmci_cpu_driven_data read");
 574
 575                 while((stat & (STATUS_APPL_BUFF_FF |  STATUS_DATA_TRANS_DONE)) &&
 576                       (host->data_cnt < 512)) {
 577
 578                         udelay(20);     /* required for clocks < 8MHz*/
 579
 580                         for(i = burst_len; i>=2 ; i-=2) {
 581                                 u16 data;
 582                                 data = MMC_BUFFER_ACCESS;
 583                                 udelay(10);     /* required for clocks < 8MHz*/
 584                                 if(host->data_cnt+2 <= host->dma_size) {
 585                                         *(host->data_ptr++) = data;
 586                                 } else {
 587                                         if(host->data_cnt < host->dma_size)
 588                                                 *(u8*)(host->data_ptr) = data;
 589                                 }
 590                                 host->data_cnt += 2;
 591                         }
 592
 593                         stat = MMC_STATUS;
 594
 595                         dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read %d burst %d STATUS = 0x%x\n",
 596                                 host->data_cnt, burst_len, stat);
 597                 }
 598
 599                 if((stat & STATUS_DATA_TRANS_DONE) && (host->data_cnt >= 512))
 600                         trans_done = 1;
 601
 602                 if(host->dma_size & 0x1ff)
 603                         stat &= ~STATUS_CRC_READ_ERR;
 604
 605         } else {
 606                 imxmci_busy_wait_for_status(host, &stat,
 607                                 STATUS_APPL_BUFF_FE,
 608                                 20, "imxmci_cpu_driven_data write");
 609
 610                 while((stat & STATUS_APPL_BUFF_FE) &&
 611                       (host->data_cnt < host->dma_size)) {
 612                         if(burst_len >= host->dma_size - host->data_cnt) {
 613                                 burst_len = host->dma_size - host->data_cnt;
 614                                 host->data_cnt = host->dma_size;
 615                                 trans_done = 1;
 616                         } else {
 617                                 host->data_cnt += burst_len;
 618                         }
 619
 620                         for(i = burst_len; i>0 ; i-=2)
 621                                 MMC_BUFFER_ACCESS = *(host->data_ptr++);
 622
 623                         stat = MMC_STATUS;
 624
 625                         dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data write burst %d STATUS = 0x%x\n",
 626                                 burst_len, stat);
 627                 }
 628         }
 629
 630         *pstat = stat;
 631
 632         return trans_done;
 633 }
 634
 635 static void imxmci_dma_irq(int dma, void *devid)
 636 {
 637         struct imxmci_host *host = devid;
 638         uint32_t stat = MMC_STATUS;
 639
 640         atomic_set(&host->stuck_timeout, 0);
 641         host->status_reg = stat;
 642         set_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
 643         tasklet_schedule(&host->tasklet);
 644 }
 645
 646 static irqreturn_t imxmci_irq(int irq, void *devid)
 647 {
 648         struct imxmci_host *host = devid;
 649         uint32_t stat = MMC_STATUS;
 650         int handled = 1;
 651
 652         MMC_INT_MASK = host->imask | INT_MASK_SDIO | INT_MASK_AUTO_CARD_DETECT;
 653
 654         atomic_set(&host->stuck_timeout, 0);
 655         host->status_reg = stat;
 656         set_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
 657         set_bit(IMXMCI_PEND_STARTED_b, &host->pending_events);
 658         tasklet_schedule(&host->tasklet);
 659
 660         return IRQ_RETVAL(handled);;
 661 }
 662
 663 static void imxmci_tasklet_fnc(unsigned long data)
 664 {
 665         struct imxmci_host *host = (struct imxmci_host *)data;
 666         u32 stat;
 667         unsigned int data_dir_mask = 0; /* STATUS_WR_CRC_ERROR_CODE_MASK */
 668         int timeout = 0;
 669
 670         if(atomic_read(&host->stuck_timeout) > 4) {
 671                 char *what;
 672                 timeout = 1;
 673                 stat = MMC_STATUS;
 674                 host->status_reg = stat;
 675                 if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
 676                         if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
 677                                 what = "RESP+DMA";
 678                         else
 679                                 what = "RESP";
 680                 else
 681                         if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
 682                                 if(test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events))
 683                                         what = "DATA";
 684                                 else
 685                                         what = "DMA";
 686                         else
 687                                 what = "???";
 688
 689                 dev_err(mmc_dev(host->mmc), "%s TIMEOUT, hardware stucked STATUS = 0x%04x IMASK = 0x%04x\n",
 690                        what, stat, MMC_INT_MASK);
 691                 dev_err(mmc_dev(host->mmc), "CMD_DAT_CONT = 0x%04x, MMC_BLK_LEN = 0x%04x, MMC_NOB = 0x%04x, DMA_CCR = 0x%08x\n",
 692                        MMC_CMD_DAT_CONT, MMC_BLK_LEN, MMC_NOB, CCR(host->dma));
 693                 dev_err(mmc_dev(host->mmc), "CMD%d, prevCMD%d, bus %d-bit, dma_size = 0x%x\n",
 694                        host->cmd?host->cmd->opcode:0, host->prev_cmd_code, 1<<host->actual_bus_width, host->dma_size);
 695         }
 696
 697         if(!host->present || timeout)
 698                 host->status_reg = STATUS_TIME_OUT_RESP | STATUS_TIME_OUT_READ |
 699                                     STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR;
 700
 701         if(test_bit(IMXMCI_PEND_IRQ_b, &host->pending_events) || timeout) {
 702                 clear_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
 703
 704                 stat = MMC_STATUS;
 705                 /*
 706                  * This is not required in theory, but there is chance to miss some flag
 707                  * which clears automatically by mask write, FreeScale original code keeps
 708                  * stat from IRQ time so do I
 709                  */
 710                 stat |= host->status_reg;
 711
 712                 if(test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
 713                         imxmci_busy_wait_for_status(host, &stat,
 714                                         STATUS_END_CMD_RESP | STATUS_ERR_MASK,
 715                                         20, "imxmci_tasklet_fnc resp (ERRATUM #4)");
 716                 }
 717
 718                 if(stat & (STATUS_END_CMD_RESP | STATUS_ERR_MASK)) {
 719                         if(test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
 720                                 imxmci_cmd_done(host, stat);
 721                         if(host->data && (stat & STATUS_ERR_MASK))
 722                                 imxmci_data_done(host, stat);
 723                 }
 724
 725                 if(test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events)) {
 726                         stat |= MMC_STATUS;
 727                         if(imxmci_cpu_driven_data(host, &stat)){
 728                                 if(test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
 729                                         imxmci_cmd_done(host, stat);
 730                                 atomic_clear_mask(IMXMCI_PEND_IRQ_m|IMXMCI_PEND_CPU_DATA_m,
 731                                                         &host->pending_events);
 732                                 imxmci_data_done(host, stat);
 733                         }
 734                 }
 735         }
 736
 737         if(test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events) &&
 738            !test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
 739
 740                 stat = MMC_STATUS;
 741                 /* Same as above */
 742                 stat |= host->status_reg;
 743
 744                 if(host->dma_dir == DMA_TO_DEVICE) {
 745                         data_dir_mask = STATUS_WRITE_OP_DONE;
 746                 } else {
 747                         data_dir_mask = STATUS_DATA_TRANS_DONE;
 748                 }
 749
 750                 if(stat & data_dir_mask) {
 751                         clear_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
 752                         imxmci_data_done(host, stat);
 753                 }
 754         }
 755
 756         if(test_and_clear_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events)) {
 757
 758                 if(host->cmd)
 759                         imxmci_cmd_done(host, STATUS_TIME_OUT_RESP);
 760
 761                 if(host->data)
 762                         imxmci_data_done(host, STATUS_TIME_OUT_READ |
 763                                          STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR);
 764
 765                 if(host->req)
 766                         imxmci_finish_request(host, host->req);
 767
 768                 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
 769
 770         }
 771 }
 772
 773 static void imxmci_request(struct mmc_host *mmc, struct mmc_request *req)
 774 {
 775         struct imxmci_host *host = mmc_priv(mmc);
 776         unsigned int cmdat;
 777
 778         WARN_ON(host->req != NULL);
 779
 780         host->req = req;
 781
 782         cmdat = 0;
 783
 784         if (req->data) {
 785                 imxmci_setup_data(host, req->data);
 786
 787                 cmdat |= CMD_DAT_CONT_DATA_ENABLE;
 788
 789                 if (req->data->flags & MMC_DATA_WRITE)
 790                         cmdat |= CMD_DAT_CONT_WRITE;
 791
 792                 if (req->data->flags & MMC_DATA_STREAM) {
 793                         cmdat |= CMD_DAT_CONT_STREAM_BLOCK;
 794                 }
 795         }
 796
 797         imxmci_start_cmd(host, req->cmd, cmdat);
 798 }
 799
 800 #define CLK_RATE 19200000
 801
 802 static void imxmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 803 {
 804         struct imxmci_host *host = mmc_priv(mmc);
 805         int prescaler;
 806
 807         if( ios->bus_width==MMC_BUS_WIDTH_4 ) {
 808                 host->actual_bus_width = MMC_BUS_WIDTH_4;
 809                 imx_gpio_mode(PB11_PF_SD_DAT3);
 810         }else{
 811                 host->actual_bus_width = MMC_BUS_WIDTH_1;
 812                 imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
 813         }
 814
 815         if ( host->power_mode != ios->power_mode ) {
 816                 switch (ios->power_mode) {
 817                 case MMC_POWER_OFF:
 818                         break;
 819                 case MMC_POWER_UP:
 820                         set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
 821                         break;
 822                 case MMC_POWER_ON:
 823                         break;
 824                 }
 825                 host->power_mode = ios->power_mode;
 826         }
 827
 828         if ( ios->clock ) {
 829                 unsigned int clk;
 830
 831                 /* The prescaler is 5 for PERCLK2 equal to 96MHz
 832                  * then 96MHz / 5 = 19.2 MHz
 833                  */
 834                 clk=imx_get_perclk2();
 835                 prescaler=(clk+(CLK_RATE*7)/8)/CLK_RATE;
 836                 switch(prescaler) {
 837                 case 0:
 838                 case 1: prescaler = 0;
 839                         break;
 840                 case 2: prescaler = 1;
 841                         break;
 842                 case 3: prescaler = 2;
 843                         break;
 844                 case 4: prescaler = 4;
 845                         break;
 846                 default:
 847                 case 5: prescaler = 5;
 848                         break;
 849                 }
 850
 851                 dev_dbg(mmc_dev(host->mmc), "PERCLK2 %d MHz -> prescaler %d\n",
 852                         clk, prescaler);
 853
 854                 for(clk=0; clk<8; clk++) {
 855                         int x;
 856                         x = CLK_RATE / (1<<clk);
 857                         if( x <= ios->clock)
 858                                 break;
 859                 }
 860
 861                 MMC_STR_STP_CLK |= STR_STP_CLK_ENABLE; /* enable controller */
 862
 863                 imxmci_stop_clock(host);
 864                 MMC_CLK_RATE = (prescaler<<3) | clk;
 865                 /*
 866                  * Under my understanding, clock should not be started there, because it would
 867                  * initiate SDHC sequencer and send last or random command into card
 868                  */
 869                 /*imxmci_start_clock(host);*/
 870
 871                 dev_dbg(mmc_dev(host->mmc), "MMC_CLK_RATE: 0x%08x\n", MMC_CLK_RATE);
 872         } else {
 873                 imxmci_stop_clock(host);
 874         }
 875 }
 876
 877 static const struct mmc_host_ops imxmci_ops = {
 878         .request        = imxmci_request,
 879         .set_ios        = imxmci_set_ios,
 880 };
 881
 882 static struct resource *platform_device_resource(struct platform_device *dev, unsigned int mask, int nr)
 883 {
 884         int i;
 885
 886         for (i = 0; i < dev->num_resources; i++)
 887                 if (dev->resource[i].flags == mask && nr-- == 0)
 888                         return &dev->resource[i];
 889         return NULL;
 890 }
 891
 892 static int platform_device_irq(struct platform_device *dev, int nr)
 893 {
 894         int i;
 895
 896         for (i = 0; i < dev->num_resources; i++)
 897                 if (dev->resource[i].flags == IORESOURCE_IRQ && nr-- == 0)
 898                         return dev->resource[i].start;
 899         return NO_IRQ;
 900 }
 901
 902 static void imxmci_check_status(unsigned long data)
 903 {
 904         struct imxmci_host *host = (struct imxmci_host *)data;
 905
 906         if( host->pdata->card_present() != host->present ) {
 907                 host->present ^= 1;
 908                 dev_info(mmc_dev(host->mmc), "card %s\n",
 909                       host->present ? "inserted" : "removed");
 910
 911                 set_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events);
 912                 tasklet_schedule(&host->tasklet);
 913         }
 914
 915         if(test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events) ||
 916            test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
 917                 atomic_inc(&host->stuck_timeout);
 918                 if(atomic_read(&host->stuck_timeout) > 4)
 919                         tasklet_schedule(&host->tasklet);
 920         } else {
 921                 atomic_set(&host->stuck_timeout, 0);
 922
 923         }
 924
 925         mod_timer(&host->timer, jiffies + (HZ>>1));
 926 }
 927
 928 static int imxmci_probe(struct platform_device *pdev)
 929 {
 930         struct mmc_host *mmc;
 931         struct imxmci_host *host = NULL;
 932         struct resource *r;
 933         int ret = 0, irq;
 934
 935         printk(KERN_INFO "i.MX mmc driver\n");
 936
 937         r = platform_device_resource(pdev, IORESOURCE_MEM, 0);
 938         irq = platform_device_irq(pdev, 0);
 939         if (!r || irq == NO_IRQ)
 940                 return -ENXIO;
 941
 942         r = request_mem_region(r->start, 0x100, "IMXMCI");
 943         if (!r)
 944                 return -EBUSY;
 945
 946         mmc = mmc_alloc_host(sizeof(struct imxmci_host), &pdev->dev);
 947         if (!mmc) {
 948                 ret = -ENOMEM;
 949                 goto out;
 950         }
 951
 952         mmc->ops = &imxmci_ops;
 953         mmc->f_min = 150000;
 954         mmc->f_max = CLK_RATE/2;
 955         mmc->ocr_avail = MMC_VDD_32_33;
 956         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_BYTEBLOCK;
 957
 958         /* MMC core transfer sizes tunable parameters */
 959         mmc->max_hw_segs = 64;
 960         mmc->max_phys_segs = 64;
 961         mmc->max_sectors = 64;          /* default 1 << (PAGE_CACHE_SHIFT - 9) */
 962         mmc->max_seg_size = 64*512;     /* default PAGE_CACHE_SIZE */
 963
 964         host = mmc_priv(mmc);
 965         host->mmc = mmc;
 966         host->dma_allocated = 0;
 967         host->pdata = pdev->dev.platform_data;
 968
 969         spin_lock_init(&host->lock);
 970         host->res = r;
 971         host->irq = irq;
 972
 973         imx_gpio_mode(PB8_PF_SD_DAT0);
 974         imx_gpio_mode(PB9_PF_SD_DAT1);
 975         imx_gpio_mode(PB10_PF_SD_DAT2);
 976         /* Configured as GPIO with pull-up to ensure right MCC card mode */
 977         /* Switched to PB11_PF_SD_DAT3 if 4 bit bus is configured */
 978         imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
 979         /* imx_gpio_mode(PB11_PF_SD_DAT3); */
 980         imx_gpio_mode(PB12_PF_SD_CLK);
 981         imx_gpio_mode(PB13_PF_SD_CMD);
 982
 983         imxmci_softreset();
 984
 985         if ( MMC_REV_NO != 0x390 ) {
 986                 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
 987                         MMC_REV_NO);
 988                 goto out;
 989         }
 990
 991         MMC_READ_TO = 0x2db4; /* recommended in data sheet */
 992
 993         host->imask = IMXMCI_INT_MASK_DEFAULT;
 994         MMC_INT_MASK = host->imask;
 995
 996
 997         if(imx_dma_request_by_prio(&host->dma, DRIVER_NAME, DMA_PRIO_LOW)<0){
 998                 dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n");
 999                 ret = -EBUSY;
1000                 goto out;
1001         }
1002         host->dma_allocated=1;
1003         imx_dma_setup_handlers(host->dma, imxmci_dma_irq, NULL, host);
1004
1005         tasklet_init(&host->tasklet, imxmci_tasklet_fnc, (unsigned long)host);
1006         host->status_reg=0;
1007         host->pending_events=0;
1008
1009         ret = request_irq(host->irq, imxmci_irq, 0, DRIVER_NAME, host);
1010         if (ret)
1011                 goto out;
1012
1013         host->present = host->pdata->card_present();
1014         init_timer(&host->timer);
1015         host->timer.data = (unsigned long)host;
1016         host->timer.function = imxmci_check_status;
1017         add_timer(&host->timer);
1018         mod_timer(&host->timer, jiffies + (HZ>>1));
1019
1020         platform_set_drvdata(pdev, mmc);
1021
1022         mmc_add_host(mmc);
1023
1024         return 0;
1025
1026 out:
1027         if (host) {
1028                 if(host->dma_allocated){
1029                         imx_dma_free(host->dma);
1030                         host->dma_allocated=0;
1031                 }
1032         }
1033         if (mmc)
1034                 mmc_free_host(mmc);
1035         release_resource(r);
1036         return ret;
1037 }
1038
1039 static int imxmci_remove(struct platform_device *pdev)
1040 {
1041         struct mmc_host *mmc = platform_get_drvdata(pdev);
1042
1043         platform_set_drvdata(pdev, NULL);
1044
1045         if (mmc) {
1046                 struct imxmci_host *host = mmc_priv(mmc);
1047
1048                 tasklet_disable(&host->tasklet);
1049
1050                 del_timer_sync(&host->timer);
1051                 mmc_remove_host(mmc);
1052
1053                 free_irq(host->irq, host);
1054                 if(host->dma_allocated){
1055                         imx_dma_free(host->dma);
1056                         host->dma_allocated=0;
1057                 }
1058
1059                 tasklet_kill(&host->tasklet);
1060
1061                 release_resource(host->res);
1062
1063                 mmc_free_host(mmc);
1064         }
1065         return 0;
1066 }
1067
1068 #ifdef CONFIG_PM
1069 static int imxmci_suspend(struct platform_device *dev, pm_message_t state)
1070 {
1071         struct mmc_host *mmc = platform_get_drvdata(dev);
1072         int ret = 0;
1073
1074         if (mmc)
1075                 ret = mmc_suspend_host(mmc, state);
1076
1077         return ret;
1078 }
1079
1080 static int imxmci_resume(struct platform_device *dev)
1081 {
1082         struct mmc_host *mmc = platform_get_drvdata(dev);
1083         struct imxmci_host *host;
1084         int ret = 0;
1085
1086         if (mmc) {
1087                 host = mmc_priv(mmc);
1088                 if(host)
1089                         set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
1090                 ret = mmc_resume_host(mmc);
1091         }
1092
1093         return ret;
1094 }
1095 #else
1096 #define imxmci_suspend  NULL
1097 #define imxmci_resume   NULL
1098 #endif /* CONFIG_PM */
1099
1100 static struct platform_driver imxmci_driver = {
1101         .probe          = imxmci_probe,
1102         .remove         = imxmci_remove,
1103         .suspend        = imxmci_suspend,
1104         .resume         = imxmci_resume,
1105         .driver         = {
1106                 .name           = DRIVER_NAME,
1107         }
1108 };
1109
1110 static int __init imxmci_init(void)
1111 {
1112         return platform_driver_register(&imxmci_driver);
1113 }
1114
1115 static void __exit imxmci_exit(void)
1116 {
1117         platform_driver_unregister(&imxmci_driver);
1118 }
1119
1120 module_init(imxmci_init);
1121 module_exit(imxmci_exit);
1122
1123 MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
1124 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1125 MODULE_LICENSE("GPL");