drivers/mmc/host/usdhi6rol0.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2013-2014 Renesas Electronics Europe Ltd.
   4  * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
   5  */
   6
   7 #include <linux/clk.h>
   8 #include <linux/delay.h>
   9 #include <linux/device.h>
  10 #include <linux/dma-mapping.h>
  11 #include <linux/dmaengine.h>
  12 #include <linux/highmem.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/io.h>
  15 #include <linux/log2.h>
  16 #include <linux/mmc/host.h>
  17 #include <linux/mmc/mmc.h>
  18 #include <linux/mmc/sd.h>
  19 #include <linux/mmc/sdio.h>
  20 #include <linux/module.h>
  21 #include <linux/pagemap.h>
  22 #include <linux/pinctrl/consumer.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/scatterlist.h>
  25 #include <linux/string.h>
  26 #include <linux/time.h>
  27 #include <linux/virtio.h>
  28 #include <linux/workqueue.h>
  29
  30 #define USDHI6_SD_CMD           0x0000
  31 #define USDHI6_SD_PORT_SEL      0x0004
  32 #define USDHI6_SD_ARG           0x0008
  33 #define USDHI6_SD_STOP          0x0010
  34 #define USDHI6_SD_SECCNT        0x0014
  35 #define USDHI6_SD_RSP10         0x0018
  36 #define USDHI6_SD_RSP32         0x0020
  37 #define USDHI6_SD_RSP54         0x0028
  38 #define USDHI6_SD_RSP76         0x0030
  39 #define USDHI6_SD_INFO1         0x0038
  40 #define USDHI6_SD_INFO2         0x003c
  41 #define USDHI6_SD_INFO1_MASK    0x0040
  42 #define USDHI6_SD_INFO2_MASK    0x0044
  43 #define USDHI6_SD_CLK_CTRL      0x0048
  44 #define USDHI6_SD_SIZE          0x004c
  45 #define USDHI6_SD_OPTION        0x0050
  46 #define USDHI6_SD_ERR_STS1      0x0058
  47 #define USDHI6_SD_ERR_STS2      0x005c
  48 #define USDHI6_SD_BUF0          0x0060
  49 #define USDHI6_SDIO_MODE        0x0068
  50 #define USDHI6_SDIO_INFO1       0x006c
  51 #define USDHI6_SDIO_INFO1_MASK  0x0070
  52 #define USDHI6_CC_EXT_MODE      0x01b0
  53 #define USDHI6_SOFT_RST         0x01c0
  54 #define USDHI6_VERSION          0x01c4
  55 #define USDHI6_HOST_MODE        0x01c8
  56 #define USDHI6_SDIF_MODE        0x01cc
  57
  58 #define USDHI6_SD_CMD_APP               0x0040
  59 #define USDHI6_SD_CMD_MODE_RSP_AUTO     0x0000
  60 #define USDHI6_SD_CMD_MODE_RSP_NONE     0x0300
  61 #define USDHI6_SD_CMD_MODE_RSP_R1       0x0400  /* Also R5, R6, R7 */
  62 #define USDHI6_SD_CMD_MODE_RSP_R1B      0x0500  /* R1b */
  63 #define USDHI6_SD_CMD_MODE_RSP_R2       0x0600
  64 #define USDHI6_SD_CMD_MODE_RSP_R3       0x0700  /* Also R4 */
  65 #define USDHI6_SD_CMD_DATA              0x0800
  66 #define USDHI6_SD_CMD_READ              0x1000
  67 #define USDHI6_SD_CMD_MULTI             0x2000
  68 #define USDHI6_SD_CMD_CMD12_AUTO_OFF    0x4000
  69
  70 #define USDHI6_CC_EXT_MODE_SDRW         BIT(1)
  71
  72 #define USDHI6_SD_INFO1_RSP_END         BIT(0)
  73 #define USDHI6_SD_INFO1_ACCESS_END      BIT(2)
  74 #define USDHI6_SD_INFO1_CARD_OUT        BIT(3)
  75 #define USDHI6_SD_INFO1_CARD_IN         BIT(4)
  76 #define USDHI6_SD_INFO1_CD              BIT(5)
  77 #define USDHI6_SD_INFO1_WP              BIT(7)
  78 #define USDHI6_SD_INFO1_D3_CARD_OUT     BIT(8)
  79 #define USDHI6_SD_INFO1_D3_CARD_IN      BIT(9)
  80
  81 #define USDHI6_SD_INFO2_CMD_ERR         BIT(0)
  82 #define USDHI6_SD_INFO2_CRC_ERR         BIT(1)
  83 #define USDHI6_SD_INFO2_END_ERR         BIT(2)
  84 #define USDHI6_SD_INFO2_TOUT            BIT(3)
  85 #define USDHI6_SD_INFO2_IWA_ERR         BIT(4)
  86 #define USDHI6_SD_INFO2_IRA_ERR         BIT(5)
  87 #define USDHI6_SD_INFO2_RSP_TOUT        BIT(6)
  88 #define USDHI6_SD_INFO2_SDDAT0          BIT(7)
  89 #define USDHI6_SD_INFO2_BRE             BIT(8)
  90 #define USDHI6_SD_INFO2_BWE             BIT(9)
  91 #define USDHI6_SD_INFO2_SCLKDIVEN       BIT(13)
  92 #define USDHI6_SD_INFO2_CBSY            BIT(14)
  93 #define USDHI6_SD_INFO2_ILA             BIT(15)
  94
  95 #define USDHI6_SD_INFO1_CARD_INSERT (USDHI6_SD_INFO1_CARD_IN | USDHI6_SD_INFO1_D3_CARD_IN)
  96 #define USDHI6_SD_INFO1_CARD_EJECT (USDHI6_SD_INFO1_CARD_OUT | USDHI6_SD_INFO1_D3_CARD_OUT)
  97 #define USDHI6_SD_INFO1_CARD (USDHI6_SD_INFO1_CARD_INSERT | USDHI6_SD_INFO1_CARD_EJECT)
  98 #define USDHI6_SD_INFO1_CARD_CD (USDHI6_SD_INFO1_CARD_IN | USDHI6_SD_INFO1_CARD_OUT)
  99
 100 #define USDHI6_SD_INFO2_ERR     (USDHI6_SD_INFO2_CMD_ERR |      \
 101         USDHI6_SD_INFO2_CRC_ERR | USDHI6_SD_INFO2_END_ERR |     \
 102         USDHI6_SD_INFO2_TOUT | USDHI6_SD_INFO2_IWA_ERR |        \
 103         USDHI6_SD_INFO2_IRA_ERR | USDHI6_SD_INFO2_RSP_TOUT |    \
 104         USDHI6_SD_INFO2_ILA)
 105
 106 #define USDHI6_SD_INFO1_IRQ     (USDHI6_SD_INFO1_RSP_END | USDHI6_SD_INFO1_ACCESS_END | \
 107                                  USDHI6_SD_INFO1_CARD)
 108
 109 #define USDHI6_SD_INFO2_IRQ     (USDHI6_SD_INFO2_ERR | USDHI6_SD_INFO2_BRE | \
 110                                  USDHI6_SD_INFO2_BWE | 0x0800 | USDHI6_SD_INFO2_ILA)
 111
 112 #define USDHI6_SD_CLK_CTRL_SCLKEN       BIT(8)
 113
 114 #define USDHI6_SD_STOP_STP              BIT(0)
 115 #define USDHI6_SD_STOP_SEC              BIT(8)
 116
 117 #define USDHI6_SDIO_INFO1_IOIRQ         BIT(0)
 118 #define USDHI6_SDIO_INFO1_EXPUB52       BIT(14)
 119 #define USDHI6_SDIO_INFO1_EXWT          BIT(15)
 120
 121 #define USDHI6_SD_ERR_STS1_CRC_NO_ERROR BIT(13)
 122
 123 #define USDHI6_SOFT_RST_RESERVED        (BIT(1) | BIT(2))
 124 #define USDHI6_SOFT_RST_RESET           BIT(0)
 125
 126 #define USDHI6_SD_OPTION_TIMEOUT_SHIFT  4
 127 #define USDHI6_SD_OPTION_TIMEOUT_MASK   (0xf << USDHI6_SD_OPTION_TIMEOUT_SHIFT)
 128 #define USDHI6_SD_OPTION_WIDTH_1        BIT(15)
 129
 130 #define USDHI6_SD_PORT_SEL_PORTS_SHIFT  8
 131
 132 #define USDHI6_SD_CLK_CTRL_DIV_MASK     0xff
 133
 134 #define USDHI6_SDIO_INFO1_IRQ   (USDHI6_SDIO_INFO1_IOIRQ | 3 | \
 135                                  USDHI6_SDIO_INFO1_EXPUB52 | USDHI6_SDIO_INFO1_EXWT)
 136
 137 #define USDHI6_MIN_DMA 64
 138
 139 #define USDHI6_REQ_TIMEOUT_MS 4000
 140
 141 enum usdhi6_wait_for {
 142         USDHI6_WAIT_FOR_REQUEST,
 143         USDHI6_WAIT_FOR_CMD,
 144         USDHI6_WAIT_FOR_MREAD,
 145         USDHI6_WAIT_FOR_MWRITE,
 146         USDHI6_WAIT_FOR_READ,
 147         USDHI6_WAIT_FOR_WRITE,
 148         USDHI6_WAIT_FOR_DATA_END,
 149         USDHI6_WAIT_FOR_STOP,
 150         USDHI6_WAIT_FOR_DMA,
 151 };
 152
 153 struct usdhi6_page {
 154         struct page *page;
 155         void *mapped;           /* mapped page */
 156 };
 157
 158 struct usdhi6_host {
 159         struct mmc_host *mmc;
 160         struct mmc_request *mrq;
 161         void __iomem *base;
 162         struct clk *clk;
 163
 164         /* SG memory handling */
 165
 166         /* Common for multiple and single block requests */
 167         struct usdhi6_page pg;  /* current page from an SG */
 168         void *blk_page;         /* either a mapped page, or the bounce buffer */
 169         size_t offset;          /* offset within a page, including sg->offset */
 170
 171         /* Blocks, crossing a page boundary */
 172         size_t head_len;
 173         struct usdhi6_page head_pg;
 174
 175         /* A bounce buffer for unaligned blocks or blocks, crossing a page boundary */
 176         struct scatterlist bounce_sg;
 177         u8 bounce_buf[512];
 178
 179         /* Multiple block requests only */
 180         struct scatterlist *sg; /* current SG segment */
 181         int page_idx;           /* page index within an SG segment */
 182
 183         enum usdhi6_wait_for wait;
 184         u32 status_mask;
 185         u32 status2_mask;
 186         u32 sdio_mask;
 187         u32 io_error;
 188         u32 irq_status;
 189         unsigned long imclk;
 190         unsigned long rate;
 191         bool app_cmd;
 192
 193         /* Timeout handling */
 194         struct delayed_work timeout_work;
 195         unsigned long timeout;
 196
 197         /* DMA support */
 198         struct dma_chan *chan_rx;
 199         struct dma_chan *chan_tx;
 200         bool dma_active;
 201
 202         /* Pin control */
 203         struct pinctrl *pinctrl;
 204         struct pinctrl_state *pins_uhs;
 205 };
 206
 207 /*                      I/O primitives                                  */
 208
 209 static void usdhi6_write(struct usdhi6_host *host, u32 reg, u32 data)
 210 {
 211         iowrite32(data, host->base + reg);
 212         dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__,
 213                 host->base, reg, data);
 214 }
 215
 216 static void usdhi6_write16(struct usdhi6_host *host, u32 reg, u16 data)
 217 {
 218         iowrite16(data, host->base + reg);
 219         dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__,
 220                 host->base, reg, data);
 221 }
 222
 223 static u32 usdhi6_read(struct usdhi6_host *host, u32 reg)
 224 {
 225         u32 data = ioread32(host->base + reg);
 226         dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__,
 227                 host->base, reg, data);
 228         return data;
 229 }
 230
 231 static u16 usdhi6_read16(struct usdhi6_host *host, u32 reg)
 232 {
 233         u16 data = ioread16(host->base + reg);
 234         dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__,
 235                 host->base, reg, data);
 236         return data;
 237 }
 238
 239 static void usdhi6_irq_enable(struct usdhi6_host *host, u32 info1, u32 info2)
 240 {
 241         host->status_mask = USDHI6_SD_INFO1_IRQ & ~info1;
 242         host->status2_mask = USDHI6_SD_INFO2_IRQ & ~info2;
 243         usdhi6_write(host, USDHI6_SD_INFO1_MASK, host->status_mask);
 244         usdhi6_write(host, USDHI6_SD_INFO2_MASK, host->status2_mask);
 245 }
 246
 247 static void usdhi6_wait_for_resp(struct usdhi6_host *host)
 248 {
 249         usdhi6_irq_enable(host, USDHI6_SD_INFO1_RSP_END |
 250                           USDHI6_SD_INFO1_ACCESS_END | USDHI6_SD_INFO1_CARD_CD,
 251                           USDHI6_SD_INFO2_ERR);
 252 }
 253
 254 static void usdhi6_wait_for_brwe(struct usdhi6_host *host, bool read)
 255 {
 256         usdhi6_irq_enable(host, USDHI6_SD_INFO1_ACCESS_END |
 257                           USDHI6_SD_INFO1_CARD_CD, USDHI6_SD_INFO2_ERR |
 258                           (read ? USDHI6_SD_INFO2_BRE : USDHI6_SD_INFO2_BWE));
 259 }
 260
 261 static void usdhi6_only_cd(struct usdhi6_host *host)
 262 {
 263         /* Mask all except card hotplug */
 264         usdhi6_irq_enable(host, USDHI6_SD_INFO1_CARD_CD, 0);
 265 }
 266
 267 static void usdhi6_mask_all(struct usdhi6_host *host)
 268 {
 269         usdhi6_irq_enable(host, 0, 0);
 270 }
 271
 272 static int usdhi6_error_code(struct usdhi6_host *host)
 273 {
 274         u32 err;
 275
 276         usdhi6_write(host, USDHI6_SD_STOP, USDHI6_SD_STOP_STP);
 277
 278         if (host->io_error &
 279             (USDHI6_SD_INFO2_RSP_TOUT | USDHI6_SD_INFO2_TOUT)) {
 280                 u32 rsp54 = usdhi6_read(host, USDHI6_SD_RSP54);
 281                 int opc = host->mrq ? host->mrq->cmd->opcode : -1;
 282
 283                 err = usdhi6_read(host, USDHI6_SD_ERR_STS2);
 284                 /* Response timeout is often normal, don't spam the log */
 285                 if (host->wait == USDHI6_WAIT_FOR_CMD)
 286                         dev_dbg(mmc_dev(host->mmc),
 287                                 "T-out sts 0x%x, resp 0x%x, state %u, CMD%d\n",
 288                                 err, rsp54, host->wait, opc);
 289                 else
 290                         dev_warn(mmc_dev(host->mmc),
 291                                  "T-out sts 0x%x, resp 0x%x, state %u, CMD%d\n",
 292                                  err, rsp54, host->wait, opc);
 293                 return -ETIMEDOUT;
 294         }
 295
 296         err = usdhi6_read(host, USDHI6_SD_ERR_STS1);
 297         if (err != USDHI6_SD_ERR_STS1_CRC_NO_ERROR)
 298                 dev_warn(mmc_dev(host->mmc), "Err sts 0x%x, state %u, CMD%d\n",
 299                          err, host->wait, host->mrq ? host->mrq->cmd->opcode : -1);
 300         if (host->io_error & USDHI6_SD_INFO2_ILA)
 301                 return -EILSEQ;
 302
 303         return -EIO;
 304 }
 305
 306 /*                      Scatter-Gather management                       */
 307
 308 /*
 309  * In PIO mode we have to map each page separately, using kmap(). That way
 310  * adjacent pages are mapped to non-adjacent virtual addresses. That's why we
 311  * have to use a bounce buffer for blocks, crossing page boundaries. Such blocks
 312  * have been observed with an SDIO WiFi card (b43 driver).
 313  */
 314 static void usdhi6_blk_bounce(struct usdhi6_host *host,
 315                               struct scatterlist *sg)
 316 {
 317         struct mmc_data *data = host->mrq->data;
 318         size_t blk_head = host->head_len;
 319
 320         dev_dbg(mmc_dev(host->mmc), "%s(): CMD%u of %u SG: %ux%u @ 0x%x\n",
 321                 __func__, host->mrq->cmd->opcode, data->sg_len,
 322                 data->blksz, data->blocks, sg->offset);
 323
 324         host->head_pg.page      = host->pg.page;
 325         host->head_pg.mapped    = host->pg.mapped;
 326         host->pg.page           = nth_page(host->pg.page, 1);
 327         host->pg.mapped         = kmap(host->pg.page);
 328
 329         host->blk_page = host->bounce_buf;
 330         host->offset = 0;
 331
 332         if (data->flags & MMC_DATA_READ)
 333                 return;
 334
 335         memcpy(host->bounce_buf, host->head_pg.mapped + PAGE_SIZE - blk_head,
 336                blk_head);
 337         memcpy(host->bounce_buf + blk_head, host->pg.mapped,
 338                data->blksz - blk_head);
 339 }
 340
 341 /* Only called for multiple block IO */
 342 static void usdhi6_sg_prep(struct usdhi6_host *host)
 343 {
 344         struct mmc_request *mrq = host->mrq;
 345         struct mmc_data *data = mrq->data;
 346
 347         usdhi6_write(host, USDHI6_SD_SECCNT, data->blocks);
 348
 349         host->sg = data->sg;
 350         /* TODO: if we always map, this is redundant */
 351         host->offset = host->sg->offset;
 352 }
 353
 354 /* Map the first page in an SG segment: common for multiple and single block IO */
 355 static void *usdhi6_sg_map(struct usdhi6_host *host)
 356 {
 357         struct mmc_data *data = host->mrq->data;
 358         struct scatterlist *sg = data->sg_len > 1 ? host->sg : data->sg;
 359         size_t head = PAGE_SIZE - sg->offset;
 360         size_t blk_head = head % data->blksz;
 361
 362         WARN(host->pg.page, "%p not properly unmapped!\n", host->pg.page);
 363         if (WARN(sg_dma_len(sg) % data->blksz,
 364                  "SG size %u isn't a multiple of block size %u\n",
 365                  sg_dma_len(sg), data->blksz))
 366                 return NULL;
 367
 368         host->pg.page = sg_page(sg);
 369         host->pg.mapped = kmap(host->pg.page);
 370         host->offset = sg->offset;
 371
 372         /*
 373          * Block size must be a power of 2 for multi-block transfers,
 374          * therefore blk_head is equal for all pages in this SG
 375          */
 376         host->head_len = blk_head;
 377
 378         if (head < data->blksz)
 379                 /*
 380                  * The first block in the SG crosses a page boundary.
 381                  * Max blksz = 512, so blocks can only span 2 pages
 382                  */
 383                 usdhi6_blk_bounce(host, sg);
 384         else
 385                 host->blk_page = host->pg.mapped;
 386
 387         dev_dbg(mmc_dev(host->mmc), "Mapped %p (%lx) at %p + %u for CMD%u @ 0x%p\n",
 388                 host->pg.page, page_to_pfn(host->pg.page), host->pg.mapped,
 389                 sg->offset, host->mrq->cmd->opcode, host->mrq);
 390
 391         return host->blk_page + host->offset;
 392 }
 393
 394 /* Unmap the current page: common for multiple and single block IO */
 395 static void usdhi6_sg_unmap(struct usdhi6_host *host, bool force)
 396 {
 397         struct mmc_data *data = host->mrq->data;
 398         struct page *page = host->head_pg.page;
 399
 400         if (page) {
 401                 /* Previous block was cross-page boundary */
 402                 struct scatterlist *sg = data->sg_len > 1 ?
 403                         host->sg : data->sg;
 404                 size_t blk_head = host->head_len;
 405
 406                 if (!data->error && data->flags & MMC_DATA_READ) {
 407                         memcpy(host->head_pg.mapped + PAGE_SIZE - blk_head,
 408                                host->bounce_buf, blk_head);
 409                         memcpy(host->pg.mapped, host->bounce_buf + blk_head,
 410                                data->blksz - blk_head);
 411                 }
 412
 413                 flush_dcache_page(page);
 414                 kunmap(page);
 415
 416                 host->head_pg.page = NULL;
 417
 418                 if (!force && sg_dma_len(sg) + sg->offset >
 419                     (host->page_idx << PAGE_SHIFT) + data->blksz - blk_head)
 420                         /* More blocks in this SG, don't unmap the next page */
 421                         return;
 422         }
 423
 424         page = host->pg.page;
 425         if (!page)
 426                 return;
 427
 428         flush_dcache_page(page);
 429         kunmap(page);
 430
 431         host->pg.page = NULL;
 432 }
 433
 434 /* Called from MMC_WRITE_MULTIPLE_BLOCK or MMC_READ_MULTIPLE_BLOCK */
 435 static void usdhi6_sg_advance(struct usdhi6_host *host)
 436 {
 437         struct mmc_data *data = host->mrq->data;
 438         size_t done, total;
 439
 440         /* New offset: set at the end of the previous block */
 441         if (host->head_pg.page) {
 442                 /* Finished a cross-page block, jump to the new page */
 443                 host->page_idx++;
 444                 host->offset = data->blksz - host->head_len;
 445                 host->blk_page = host->pg.mapped;
 446                 usdhi6_sg_unmap(host, false);
 447         } else {
 448                 host->offset += data->blksz;
 449                 /* The completed block didn't cross a page boundary */
 450                 if (host->offset == PAGE_SIZE) {
 451                         /* If required, we'll map the page below */
 452                         host->offset = 0;
 453                         host->page_idx++;
 454                 }
 455         }
 456
 457         /*
 458          * Now host->blk_page + host->offset point at the end of our last block
 459          * and host->page_idx is the index of the page, in which our new block
 460          * is located, if any
 461          */
 462
 463         done = (host->page_idx << PAGE_SHIFT) + host->offset;
 464         total = host->sg->offset + sg_dma_len(host->sg);
 465
 466         dev_dbg(mmc_dev(host->mmc), "%s(): %zu of %zu @ %zu\n", __func__,
 467                 done, total, host->offset);
 468
 469         if (done < total && host->offset) {
 470                 /* More blocks in this page */
 471                 if (host->offset + data->blksz > PAGE_SIZE)
 472                         /* We approached at a block, that spans 2 pages */
 473                         usdhi6_blk_bounce(host, host->sg);
 474
 475                 return;
 476         }
 477
 478         /* Finished current page or an SG segment */
 479         usdhi6_sg_unmap(host, false);
 480
 481         if (done == total) {
 482                 /*
 483                  * End of an SG segment or the complete SG: jump to the next
 484                  * segment, we'll map it later in usdhi6_blk_read() or
 485                  * usdhi6_blk_write()
 486                  */
 487                 struct scatterlist *next = sg_next(host->sg);
 488
 489                 host->page_idx = 0;
 490
 491                 if (!next)
 492                         host->wait = USDHI6_WAIT_FOR_DATA_END;
 493                 host->sg = next;
 494
 495                 if (WARN(next && sg_dma_len(next) % data->blksz,
 496                          "SG size %u isn't a multiple of block size %u\n",
 497                          sg_dma_len(next), data->blksz))
 498                         data->error = -EINVAL;
 499
 500                 return;
 501         }
 502
 503         /* We cannot get here after crossing a page border */
 504
 505         /* Next page in the same SG */
 506         host->pg.page = nth_page(sg_page(host->sg), host->page_idx);
 507         host->pg.mapped = kmap(host->pg.page);
 508         host->blk_page = host->pg.mapped;
 509
 510         dev_dbg(mmc_dev(host->mmc), "Mapped %p (%lx) at %p for CMD%u @ 0x%p\n",
 511                 host->pg.page, page_to_pfn(host->pg.page), host->pg.mapped,
 512                 host->mrq->cmd->opcode, host->mrq);
 513 }
 514
 515 /*                      DMA handling                                    */
 516
 517 static void usdhi6_dma_release(struct usdhi6_host *host)
 518 {
 519         host->dma_active = false;
 520         if (host->chan_tx) {
 521                 struct dma_chan *chan = host->chan_tx;
 522                 host->chan_tx = NULL;
 523                 dma_release_channel(chan);
 524         }
 525         if (host->chan_rx) {
 526                 struct dma_chan *chan = host->chan_rx;
 527                 host->chan_rx = NULL;
 528                 dma_release_channel(chan);
 529         }
 530 }
 531
 532 static void usdhi6_dma_stop_unmap(struct usdhi6_host *host)
 533 {
 534         struct mmc_data *data = host->mrq->data;
 535
 536         if (!host->dma_active)
 537                 return;
 538
 539         usdhi6_write(host, USDHI6_CC_EXT_MODE, 0);
 540         host->dma_active = false;
 541
 542         if (data->flags & MMC_DATA_READ)
 543                 dma_unmap_sg(host->chan_rx->device->dev, data->sg,
 544                              data->sg_len, DMA_FROM_DEVICE);
 545         else
 546                 dma_unmap_sg(host->chan_tx->device->dev, data->sg,
 547                              data->sg_len, DMA_TO_DEVICE);
 548 }
 549
 550 static void usdhi6_dma_complete(void *arg)
 551 {
 552         struct usdhi6_host *host = arg;
 553         struct mmc_request *mrq = host->mrq;
 554
 555         if (WARN(!mrq || !mrq->data, "%s: NULL data in DMA completion for %p!\n",
 556                  dev_name(mmc_dev(host->mmc)), mrq))
 557                 return;
 558
 559         dev_dbg(mmc_dev(host->mmc), "%s(): CMD%u DMA completed\n", __func__,
 560                 mrq->cmd->opcode);
 561
 562         usdhi6_dma_stop_unmap(host);
 563         usdhi6_wait_for_brwe(host, mrq->data->flags & MMC_DATA_READ);
 564 }
 565
 566 static int usdhi6_dma_setup(struct usdhi6_host *host, struct dma_chan *chan,
 567                             enum dma_transfer_direction dir)
 568 {
 569         struct mmc_data *data = host->mrq->data;
 570         struct scatterlist *sg = data->sg;
 571         struct dma_async_tx_descriptor *desc = NULL;
 572         dma_cookie_t cookie = -EINVAL;
 573         enum dma_data_direction data_dir;
 574         int ret;
 575
 576         switch (dir) {
 577         case DMA_MEM_TO_DEV:
 578                 data_dir = DMA_TO_DEVICE;
 579                 break;
 580         case DMA_DEV_TO_MEM:
 581                 data_dir = DMA_FROM_DEVICE;
 582                 break;
 583         default:
 584                 return -EINVAL;
 585         }
 586
 587         ret = dma_map_sg(chan->device->dev, sg, data->sg_len, data_dir);
 588         if (ret > 0) {
 589                 host->dma_active = true;
 590                 desc = dmaengine_prep_slave_sg(chan, sg, ret, dir,
 591                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 592         }
 593
 594         if (desc) {
 595                 desc->callback = usdhi6_dma_complete;
 596                 desc->callback_param = host;
 597                 cookie = dmaengine_submit(desc);
 598         }
 599
 600         dev_dbg(mmc_dev(host->mmc), "%s(): mapped %d -> %d, cookie %d @ %p\n",
 601                 __func__, data->sg_len, ret, cookie, desc);
 602
 603         if (cookie < 0) {
 604                 /* DMA failed, fall back to PIO */
 605                 if (ret >= 0)
 606                         ret = cookie;
 607                 usdhi6_dma_release(host);
 608                 dev_warn(mmc_dev(host->mmc),
 609                          "DMA failed: %d, falling back to PIO\n", ret);
 610         }
 611
 612         return cookie;
 613 }
 614
 615 static int usdhi6_dma_start(struct usdhi6_host *host)
 616 {
 617         if (!host->chan_rx || !host->chan_tx)
 618                 return -ENODEV;
 619
 620         if (host->mrq->data->flags & MMC_DATA_READ)
 621                 return usdhi6_dma_setup(host, host->chan_rx, DMA_DEV_TO_MEM);
 622
 623         return usdhi6_dma_setup(host, host->chan_tx, DMA_MEM_TO_DEV);
 624 }
 625
 626 static void usdhi6_dma_kill(struct usdhi6_host *host)
 627 {
 628         struct mmc_data *data = host->mrq->data;
 629
 630         dev_dbg(mmc_dev(host->mmc), "%s(): SG of %u: %ux%u\n",
 631                 __func__, data->sg_len, data->blocks, data->blksz);
 632         /* Abort DMA */
 633         if (data->flags & MMC_DATA_READ)
 634                 dmaengine_terminate_sync(host->chan_rx);
 635         else
 636                 dmaengine_terminate_sync(host->chan_tx);
 637 }
 638
 639 static void usdhi6_dma_check_error(struct usdhi6_host *host)
 640 {
 641         struct mmc_data *data = host->mrq->data;
 642
 643         dev_dbg(mmc_dev(host->mmc), "%s(): IO error %d, status 0x%x\n",
 644                 __func__, host->io_error, usdhi6_read(host, USDHI6_SD_INFO1));
 645
 646         if (host->io_error) {
 647                 data->error = usdhi6_error_code(host);
 648                 data->bytes_xfered = 0;
 649                 usdhi6_dma_kill(host);
 650                 usdhi6_dma_release(host);
 651                 dev_warn(mmc_dev(host->mmc),
 652                          "DMA failed: %d, falling back to PIO\n", data->error);
 653                 return;
 654         }
 655
 656         /*
 657          * The datasheet tells us to check a response from the card, whereas
 658          * responses only come after the command phase, not after the data
 659          * phase. Let's check anyway.
 660          */
 661         if (host->irq_status & USDHI6_SD_INFO1_RSP_END)
 662                 dev_warn(mmc_dev(host->mmc), "Unexpected response received!\n");
 663 }
 664
 665 static void usdhi6_dma_kick(struct usdhi6_host *host)
 666 {
 667         if (host->mrq->data->flags & MMC_DATA_READ)
 668                 dma_async_issue_pending(host->chan_rx);
 669         else
 670                 dma_async_issue_pending(host->chan_tx);
 671 }
 672
 673 static void usdhi6_dma_request(struct usdhi6_host *host, phys_addr_t start)
 674 {
 675         struct dma_slave_config cfg = {
 676                 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
 677                 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
 678         };
 679         int ret;
 680
 681         host->chan_tx = dma_request_chan(mmc_dev(host->mmc), "tx");
 682         dev_dbg(mmc_dev(host->mmc), "%s: TX: got channel %p\n", __func__,
 683                 host->chan_tx);
 684
 685         if (IS_ERR(host->chan_tx)) {
 686                 host->chan_tx = NULL;
 687                 return;
 688         }
 689
 690         cfg.direction = DMA_MEM_TO_DEV;
 691         cfg.dst_addr = start + USDHI6_SD_BUF0;
 692         cfg.dst_maxburst = 128; /* 128 words * 4 bytes = 512 bytes */
 693         cfg.src_addr = 0;
 694         ret = dmaengine_slave_config(host->chan_tx, &cfg);
 695         if (ret < 0)
 696                 goto e_release_tx;
 697
 698         host->chan_rx = dma_request_chan(mmc_dev(host->mmc), "rx");
 699         dev_dbg(mmc_dev(host->mmc), "%s: RX: got channel %p\n", __func__,
 700                 host->chan_rx);
 701
 702         if (IS_ERR(host->chan_rx)) {
 703                 host->chan_rx = NULL;
 704                 goto e_release_tx;
 705         }
 706
 707         cfg.direction = DMA_DEV_TO_MEM;
 708         cfg.src_addr = cfg.dst_addr;
 709         cfg.src_maxburst = 128; /* 128 words * 4 bytes = 512 bytes */
 710         cfg.dst_addr = 0;
 711         ret = dmaengine_slave_config(host->chan_rx, &cfg);
 712         if (ret < 0)
 713                 goto e_release_rx;
 714
 715         return;
 716
 717 e_release_rx:
 718         dma_release_channel(host->chan_rx);
 719         host->chan_rx = NULL;
 720 e_release_tx:
 721         dma_release_channel(host->chan_tx);
 722         host->chan_tx = NULL;
 723 }
 724
 725 /*                      API helpers                                     */
 726
 727 static void usdhi6_clk_set(struct usdhi6_host *host, struct mmc_ios *ios)
 728 {
 729         unsigned long rate = ios->clock;
 730         u32 val;
 731         unsigned int i;
 732
 733         for (i = 1000; i; i--) {
 734                 if (usdhi6_read(host, USDHI6_SD_INFO2) & USDHI6_SD_INFO2_SCLKDIVEN)
 735                         break;
 736                 usleep_range(10, 100);
 737         }
 738
 739         if (!i) {
 740                 dev_err(mmc_dev(host->mmc), "SD bus busy, clock set aborted\n");
 741                 return;
 742         }
 743
 744         val = usdhi6_read(host, USDHI6_SD_CLK_CTRL) & ~USDHI6_SD_CLK_CTRL_DIV_MASK;
 745
 746         if (rate) {
 747                 unsigned long new_rate;
 748
 749                 if (host->imclk <= rate) {
 750                         if (ios->timing != MMC_TIMING_UHS_DDR50) {
 751                                 /* Cannot have 1-to-1 clock in DDR mode */
 752                                 new_rate = host->imclk;
 753                                 val |= 0xff;
 754                         } else {
 755                                 new_rate = host->imclk / 2;
 756                         }
 757                 } else {
 758                         unsigned long div =
 759                                 roundup_pow_of_two(DIV_ROUND_UP(host->imclk, rate));
 760                         val |= div >> 2;
 761                         new_rate = host->imclk / div;
 762                 }
 763
 764                 if (host->rate == new_rate)
 765                         return;
 766
 767                 host->rate = new_rate;
 768
 769                 dev_dbg(mmc_dev(host->mmc), "target %lu, div %u, set %lu\n",
 770                         rate, (val & 0xff) << 2, new_rate);
 771         }
 772
 773         /*
 774          * if old or new rate is equal to input rate, have to switch the clock
 775          * off before changing and on after
 776          */
 777         if (host->imclk == rate || host->imclk == host->rate || !rate)
 778                 usdhi6_write(host, USDHI6_SD_CLK_CTRL,
 779                              val & ~USDHI6_SD_CLK_CTRL_SCLKEN);
 780
 781         if (!rate) {
 782                 host->rate = 0;
 783                 return;
 784         }
 785
 786         usdhi6_write(host, USDHI6_SD_CLK_CTRL, val);
 787
 788         if (host->imclk == rate || host->imclk == host->rate ||
 789             !(val & USDHI6_SD_CLK_CTRL_SCLKEN))
 790                 usdhi6_write(host, USDHI6_SD_CLK_CTRL,
 791                              val | USDHI6_SD_CLK_CTRL_SCLKEN);
 792 }
 793
 794 static void usdhi6_set_power(struct usdhi6_host *host, struct mmc_ios *ios)
 795 {
 796         struct mmc_host *mmc = host->mmc;
 797
 798         if (!IS_ERR(mmc->supply.vmmc))
 799                 /* Errors ignored... */
 800                 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
 801                                       ios->power_mode ? ios->vdd : 0);
 802 }
 803
 804 static int usdhi6_reset(struct usdhi6_host *host)
 805 {
 806         int i;
 807
 808         usdhi6_write(host, USDHI6_SOFT_RST, USDHI6_SOFT_RST_RESERVED);
 809         cpu_relax();
 810         usdhi6_write(host, USDHI6_SOFT_RST, USDHI6_SOFT_RST_RESERVED | USDHI6_SOFT_RST_RESET);
 811         for (i = 1000; i; i--)
 812                 if (usdhi6_read(host, USDHI6_SOFT_RST) & USDHI6_SOFT_RST_RESET)
 813                         break;
 814
 815         return i ? 0 : -ETIMEDOUT;
 816 }
 817
 818 static void usdhi6_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 819 {
 820         struct usdhi6_host *host = mmc_priv(mmc);
 821         u32 option, mode;
 822         int ret;
 823
 824         dev_dbg(mmc_dev(mmc), "%uHz, OCR: %u, power %u, bus-width %u, timing %u\n",
 825                 ios->clock, ios->vdd, ios->power_mode, ios->bus_width, ios->timing);
 826
 827         switch (ios->power_mode) {
 828         case MMC_POWER_OFF:
 829                 usdhi6_set_power(host, ios);
 830                 usdhi6_only_cd(host);
 831                 break;
 832         case MMC_POWER_UP:
 833                 /*
 834                  * We only also touch USDHI6_SD_OPTION from .request(), which
 835                  * cannot race with MMC_POWER_UP
 836                  */
 837                 ret = usdhi6_reset(host);
 838                 if (ret < 0) {
 839                         dev_err(mmc_dev(mmc), "Cannot reset the interface!\n");
 840                 } else {
 841                         usdhi6_set_power(host, ios);
 842                         usdhi6_only_cd(host);
 843                 }
 844                 break;
 845         case MMC_POWER_ON:
 846                 option = usdhi6_read(host, USDHI6_SD_OPTION);
 847                 /*
 848                  * The eMMC standard only allows 4 or 8 bits in the DDR mode,
 849                  * the same probably holds for SD cards. We check here anyway,
 850                  * since the datasheet explicitly requires 4 bits for DDR.
 851                  */
 852                 if (ios->bus_width == MMC_BUS_WIDTH_1) {
 853                         if (ios->timing == MMC_TIMING_UHS_DDR50)
 854                                 dev_err(mmc_dev(mmc),
 855                                         "4 bits are required for DDR\n");
 856                         option |= USDHI6_SD_OPTION_WIDTH_1;
 857                         mode = 0;
 858                 } else {
 859                         option &= ~USDHI6_SD_OPTION_WIDTH_1;
 860                         mode = ios->timing == MMC_TIMING_UHS_DDR50;
 861                 }
 862                 usdhi6_write(host, USDHI6_SD_OPTION, option);
 863                 usdhi6_write(host, USDHI6_SDIF_MODE, mode);
 864                 break;
 865         }
 866
 867         if (host->rate != ios->clock)
 868                 usdhi6_clk_set(host, ios);
 869 }
 870
 871 /* This is data timeout. Response timeout is fixed to 640 clock cycles */
 872 static void usdhi6_timeout_set(struct usdhi6_host *host)
 873 {
 874         struct mmc_request *mrq = host->mrq;
 875         u32 val;
 876         unsigned long ticks;
 877
 878         if (!mrq->data)
 879                 ticks = host->rate / 1000 * mrq->cmd->busy_timeout;
 880         else
 881                 ticks = host->rate / 1000000 * (mrq->data->timeout_ns / 1000) +
 882                         mrq->data->timeout_clks;
 883
 884         if (!ticks || ticks > 1 << 27)
 885                 /* Max timeout */
 886                 val = 14;
 887         else if (ticks < 1 << 13)
 888                 /* Min timeout */
 889                 val = 0;
 890         else
 891                 val = order_base_2(ticks) - 13;
 892
 893         dev_dbg(mmc_dev(host->mmc), "Set %s timeout %lu ticks @ %lu Hz\n",
 894                 mrq->data ? "data" : "cmd", ticks, host->rate);
 895
 896         /* Timeout Counter mask: 0xf0 */
 897         usdhi6_write(host, USDHI6_SD_OPTION, (val << USDHI6_SD_OPTION_TIMEOUT_SHIFT) |
 898                      (usdhi6_read(host, USDHI6_SD_OPTION) & ~USDHI6_SD_OPTION_TIMEOUT_MASK));
 899 }
 900
 901 static void usdhi6_request_done(struct usdhi6_host *host)
 902 {
 903         struct mmc_request *mrq = host->mrq;
 904         struct mmc_data *data = mrq->data;
 905
 906         if (WARN(host->pg.page || host->head_pg.page,
 907                  "Page %p or %p not unmapped: wait %u, CMD%d(%c) @ +0x%zx %ux%u in SG%u!\n",
 908                  host->pg.page, host->head_pg.page, host->wait, mrq->cmd->opcode,
 909                  data ? (data->flags & MMC_DATA_READ ? 'R' : 'W') : '-',
 910                  data ? host->offset : 0, data ? data->blocks : 0,
 911                  data ? data->blksz : 0, data ? data->sg_len : 0))
 912                 usdhi6_sg_unmap(host, true);
 913
 914         if (mrq->cmd->error ||
 915             (data && data->error) ||
 916             (mrq->stop && mrq->stop->error))
 917                 dev_dbg(mmc_dev(host->mmc), "%s(CMD%d: %ux%u): err %d %d %d\n",
 918                         __func__, mrq->cmd->opcode, data ? data->blocks : 0,
 919                         data ? data->blksz : 0,
 920                         mrq->cmd->error,
 921                         data ? data->error : 1,
 922                         mrq->stop ? mrq->stop->error : 1);
 923
 924         /* Disable DMA */
 925         usdhi6_write(host, USDHI6_CC_EXT_MODE, 0);
 926         host->wait = USDHI6_WAIT_FOR_REQUEST;
 927         host->mrq = NULL;
 928
 929         mmc_request_done(host->mmc, mrq);
 930 }
 931
 932 static int usdhi6_cmd_flags(struct usdhi6_host *host)
 933 {
 934         struct mmc_request *mrq = host->mrq;
 935         struct mmc_command *cmd = mrq->cmd;
 936         u16 opc = cmd->opcode;
 937
 938         if (host->app_cmd) {
 939                 host->app_cmd = false;
 940                 opc |= USDHI6_SD_CMD_APP;
 941         }
 942
 943         if (mrq->data) {
 944                 opc |= USDHI6_SD_CMD_DATA;
 945
 946                 if (mrq->data->flags & MMC_DATA_READ)
 947                         opc |= USDHI6_SD_CMD_READ;
 948
 949                 if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
 950                     cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK ||
 951                     (cmd->opcode == SD_IO_RW_EXTENDED &&
 952                      mrq->data->blocks > 1)) {
 953                         opc |= USDHI6_SD_CMD_MULTI;
 954                         if (!mrq->stop)
 955                                 opc |= USDHI6_SD_CMD_CMD12_AUTO_OFF;
 956                 }
 957
 958                 switch (mmc_resp_type(cmd)) {
 959                 case MMC_RSP_NONE:
 960                         opc |= USDHI6_SD_CMD_MODE_RSP_NONE;
 961                         break;
 962                 case MMC_RSP_R1:
 963                         opc |= USDHI6_SD_CMD_MODE_RSP_R1;
 964                         break;
 965                 case MMC_RSP_R1B:
 966                         opc |= USDHI6_SD_CMD_MODE_RSP_R1B;
 967                         break;
 968                 case MMC_RSP_R2:
 969                         opc |= USDHI6_SD_CMD_MODE_RSP_R2;
 970                         break;
 971                 case MMC_RSP_R3:
 972                         opc |= USDHI6_SD_CMD_MODE_RSP_R3;
 973                         break;
 974                 default:
 975                         dev_warn(mmc_dev(host->mmc),
 976                                  "Unknown response type %d\n",
 977                                  mmc_resp_type(cmd));
 978                         return -EINVAL;
 979                 }
 980         }
 981
 982         return opc;
 983 }
 984
 985 static int usdhi6_rq_start(struct usdhi6_host *host)
 986 {
 987         struct mmc_request *mrq = host->mrq;
 988         struct mmc_command *cmd = mrq->cmd;
 989         struct mmc_data *data = mrq->data;
 990         int opc = usdhi6_cmd_flags(host);
 991         int i;
 992
 993         if (opc < 0)
 994                 return opc;
 995
 996         for (i = 1000; i; i--) {
 997                 if (!(usdhi6_read(host, USDHI6_SD_INFO2) & USDHI6_SD_INFO2_CBSY))
 998                         break;
 999                 usleep_range(10, 100);
1000         }
1001
1002         if (!i) {
1003                 dev_dbg(mmc_dev(host->mmc), "Command active, request aborted\n");
1004                 return -EAGAIN;
1005         }
1006
1007         if (data) {
1008                 bool use_dma;
1009                 int ret = 0;
1010
1011                 host->page_idx = 0;
1012
1013                 if (cmd->opcode == SD_IO_RW_EXTENDED && data->blocks > 1) {
1014                         switch (data->blksz) {
1015                         case 512:
1016                                 break;
1017                         case 32:
1018                         case 64:
1019                         case 128:
1020                         case 256:
1021                                 if (mrq->stop)
1022                                         ret = -EINVAL;
1023                                 break;
1024                         default:
1025                                 ret = -EINVAL;
1026                         }
1027                 } else if ((cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
1028                             cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) &&
1029                            data->blksz != 512) {
1030                         ret = -EINVAL;
1031                 }
1032
1033                 if (ret < 0) {
1034                         dev_warn(mmc_dev(host->mmc), "%s(): %u blocks of %u bytes\n",
1035                                  __func__, data->blocks, data->blksz);
1036                         return -EINVAL;
1037                 }
1038
1039                 if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
1040                     cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK ||
1041                     (cmd->opcode == SD_IO_RW_EXTENDED &&
1042                      data->blocks > 1))
1043                         usdhi6_sg_prep(host);
1044
1045                 usdhi6_write(host, USDHI6_SD_SIZE, data->blksz);
1046
1047                 if ((data->blksz >= USDHI6_MIN_DMA ||
1048                      data->blocks > 1) &&
1049                     (data->blksz % 4 ||
1050                      data->sg->offset % 4))
1051                         dev_dbg(mmc_dev(host->mmc),
1052                                 "Bad SG of %u: %ux%u @ %u\n", data->sg_len,
1053                                 data->blksz, data->blocks, data->sg->offset);
1054
1055                 /* Enable DMA for USDHI6_MIN_DMA bytes or more */
1056                 use_dma = data->blksz >= USDHI6_MIN_DMA &&
1057                         !(data->blksz % 4) &&
1058                         usdhi6_dma_start(host) >= DMA_MIN_COOKIE;
1059
1060                 if (use_dma)
1061                         usdhi6_write(host, USDHI6_CC_EXT_MODE, USDHI6_CC_EXT_MODE_SDRW);
1062
1063                 dev_dbg(mmc_dev(host->mmc),
1064                         "%s(): request opcode %u, %u blocks of %u bytes in %u segments, %s %s @+0x%x%s\n",
1065                         __func__, cmd->opcode, data->blocks, data->blksz,
1066                         data->sg_len, use_dma ? "DMA" : "PIO",
1067                         data->flags & MMC_DATA_READ ? "read" : "write",
1068                         data->sg->offset, mrq->stop ? " + stop" : "");
1069         } else {
1070                 dev_dbg(mmc_dev(host->mmc), "%s(): request opcode %u\n",
1071                         __func__, cmd->opcode);
1072         }
1073
1074         /* We have to get a command completion interrupt with DMA too */
1075         usdhi6_wait_for_resp(host);
1076
1077         host->wait = USDHI6_WAIT_FOR_CMD;
1078         schedule_delayed_work(&host->timeout_work, host->timeout);
1079
1080         /* SEC bit is required to enable block counting by the core */
1081         usdhi6_write(host, USDHI6_SD_STOP,
1082                      data && data->blocks > 1 ? USDHI6_SD_STOP_SEC : 0);
1083         usdhi6_write(host, USDHI6_SD_ARG, cmd->arg);
1084
1085         /* Kick command execution */
1086         usdhi6_write(host, USDHI6_SD_CMD, opc);
1087
1088         return 0;
1089 }
1090
1091 static void usdhi6_request(struct mmc_host *mmc, struct mmc_request *mrq)
1092 {
1093         struct usdhi6_host *host = mmc_priv(mmc);
1094         int ret;
1095
1096         cancel_delayed_work_sync(&host->timeout_work);
1097
1098         host->mrq = mrq;
1099         host->sg = NULL;
1100
1101         usdhi6_timeout_set(host);
1102         ret = usdhi6_rq_start(host);
1103         if (ret < 0) {
1104                 mrq->cmd->error = ret;
1105                 usdhi6_request_done(host);
1106         }
1107 }
1108
1109 static int usdhi6_get_cd(struct mmc_host *mmc)
1110 {
1111         struct usdhi6_host *host = mmc_priv(mmc);
1112         /* Read is atomic, no need to lock */
1113         u32 status = usdhi6_read(host, USDHI6_SD_INFO1) & USDHI6_SD_INFO1_CD;
1114
1115 /*
1116  *      level   status.CD       CD_ACTIVE_HIGH  card present
1117  *      1       0               0               0
1118  *      1       0               1               1
1119  *      0       1               0               1
1120  *      0       1               1               0
1121  */
1122         return !status ^ !(mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH);
1123 }
1124
1125 static int usdhi6_get_ro(struct mmc_host *mmc)
1126 {
1127         struct usdhi6_host *host = mmc_priv(mmc);
1128         /* No locking as above */
1129         u32 status = usdhi6_read(host, USDHI6_SD_INFO1) & USDHI6_SD_INFO1_WP;
1130
1131 /*
1132  *      level   status.WP       RO_ACTIVE_HIGH  card read-only
1133  *      1       0               0               0
1134  *      1       0               1               1
1135  *      0       1               0               1
1136  *      0       1               1               0
1137  */
1138         return !status ^ !(mmc->caps2 & MMC_CAP2_RO_ACTIVE_HIGH);
1139 }
1140
1141 static void usdhi6_enable_sdio_irq(struct mmc_host *mmc, int enable)
1142 {
1143         struct usdhi6_host *host = mmc_priv(mmc);
1144
1145         dev_dbg(mmc_dev(mmc), "%s(): %sable\n", __func__, enable ? "en" : "dis");
1146
1147         if (enable) {
1148                 host->sdio_mask = USDHI6_SDIO_INFO1_IRQ & ~USDHI6_SDIO_INFO1_IOIRQ;
1149                 usdhi6_write(host, USDHI6_SDIO_INFO1_MASK, host->sdio_mask);
1150                 usdhi6_write(host, USDHI6_SDIO_MODE, 1);
1151         } else {
1152                 usdhi6_write(host, USDHI6_SDIO_MODE, 0);
1153                 usdhi6_write(host, USDHI6_SDIO_INFO1_MASK, USDHI6_SDIO_INFO1_IRQ);
1154                 host->sdio_mask = USDHI6_SDIO_INFO1_IRQ;
1155         }
1156 }
1157
1158 static int usdhi6_set_pinstates(struct usdhi6_host *host, int voltage)
1159 {
1160         if (IS_ERR(host->pins_uhs))
1161                 return 0;
1162
1163         switch (voltage) {
1164         case MMC_SIGNAL_VOLTAGE_180:
1165         case MMC_SIGNAL_VOLTAGE_120:
1166                 return pinctrl_select_state(host->pinctrl,
1167                                             host->pins_uhs);
1168
1169         default:
1170                 return pinctrl_select_default_state(mmc_dev(host->mmc));
1171         }
1172 }
1173
1174 static int usdhi6_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
1175 {
1176         int ret;
1177
1178         ret = mmc_regulator_set_vqmmc(mmc, ios);
1179         if (ret < 0)
1180                 return ret;
1181
1182         ret = usdhi6_set_pinstates(mmc_priv(mmc), ios->signal_voltage);
1183         if (ret)
1184                 dev_warn_once(mmc_dev(mmc),
1185                               "Failed to set pinstate err=%d\n", ret);
1186         return ret;
1187 }
1188
1189 static const struct mmc_host_ops usdhi6_ops = {
1190         .request        = usdhi6_request,
1191         .set_ios        = usdhi6_set_ios,
1192         .get_cd         = usdhi6_get_cd,
1193         .get_ro         = usdhi6_get_ro,
1194         .enable_sdio_irq = usdhi6_enable_sdio_irq,
1195         .start_signal_voltage_switch = usdhi6_sig_volt_switch,
1196 };
1197
1198 /*                      State machine handlers                          */
1199
1200 static void usdhi6_resp_cmd12(struct usdhi6_host *host)
1201 {
1202         struct mmc_command *cmd = host->mrq->stop;
1203         cmd->resp[0] = usdhi6_read(host, USDHI6_SD_RSP10);
1204 }
1205
1206 static void usdhi6_resp_read(struct usdhi6_host *host)
1207 {
1208         struct mmc_command *cmd = host->mrq->cmd;
1209         u32 *rsp = cmd->resp, tmp = 0;
1210         int i;
1211
1212 /*
1213  * RSP10        39-8
1214  * RSP32        71-40
1215  * RSP54        103-72
1216  * RSP76        127-104
1217  * R2-type response:
1218  * resp[0]      = r[127..96]
1219  * resp[1]      = r[95..64]
1220  * resp[2]      = r[63..32]
1221  * resp[3]      = r[31..0]
1222  * Other responses:
1223  * resp[0]      = r[39..8]
1224  */
1225
1226         if (mmc_resp_type(cmd) == MMC_RSP_NONE)
1227                 return;
1228
1229         if (!(host->irq_status & USDHI6_SD_INFO1_RSP_END)) {
1230                 dev_err(mmc_dev(host->mmc),
1231                         "CMD%d: response expected but is missing!\n", cmd->opcode);
1232                 return;
1233         }
1234
1235         if (mmc_resp_type(cmd) & MMC_RSP_136)
1236                 for (i = 0; i < 4; i++) {
1237                         if (i)
1238                                 rsp[3 - i] = tmp >> 24;
1239                         tmp = usdhi6_read(host, USDHI6_SD_RSP10 + i * 8);
1240                         rsp[3 - i] |= tmp << 8;
1241                 }
1242         else if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
1243                  cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK)
1244                 /* Read RSP54 to avoid conflict with auto CMD12 */
1245                 rsp[0] = usdhi6_read(host, USDHI6_SD_RSP54);
1246         else
1247                 rsp[0] = usdhi6_read(host, USDHI6_SD_RSP10);
1248
1249         dev_dbg(mmc_dev(host->mmc), "Response 0x%x\n", rsp[0]);
1250 }
1251
1252 static int usdhi6_blk_read(struct usdhi6_host *host)
1253 {
1254         struct mmc_data *data = host->mrq->data;
1255         u32 *p;
1256         int i, rest;
1257
1258         if (host->io_error) {
1259                 data->error = usdhi6_error_code(host);
1260                 goto error;
1261         }
1262
1263         if (host->pg.page) {
1264                 p = host->blk_page + host->offset;
1265         } else {
1266                 p = usdhi6_sg_map(host);
1267                 if (!p) {
1268                         data->error = -ENOMEM;
1269                         goto error;
1270                 }
1271         }
1272
1273         for (i = 0; i < data->blksz / 4; i++, p++)
1274                 *p = usdhi6_read(host, USDHI6_SD_BUF0);
1275
1276         rest = data->blksz % 4;
1277         for (i = 0; i < (rest + 1) / 2; i++) {
1278                 u16 d = usdhi6_read16(host, USDHI6_SD_BUF0);
1279                 ((u8 *)p)[2 * i] = ((u8 *)&d)[0];
1280                 if (rest > 1 && !i)
1281                         ((u8 *)p)[2 * i + 1] = ((u8 *)&d)[1];
1282         }
1283
1284         return 0;
1285
1286 error:
1287         dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data->error);
1288         host->wait = USDHI6_WAIT_FOR_REQUEST;
1289         return data->error;
1290 }
1291
1292 static int usdhi6_blk_write(struct usdhi6_host *host)
1293 {
1294         struct mmc_data *data = host->mrq->data;
1295         u32 *p;
1296         int i, rest;
1297
1298         if (host->io_error) {
1299                 data->error = usdhi6_error_code(host);
1300                 goto error;
1301         }
1302
1303         if (host->pg.page) {
1304                 p = host->blk_page + host->offset;
1305         } else {
1306                 p = usdhi6_sg_map(host);
1307                 if (!p) {
1308                         data->error = -ENOMEM;
1309                         goto error;
1310                 }
1311         }
1312
1313         for (i = 0; i < data->blksz / 4; i++, p++)
1314                 usdhi6_write(host, USDHI6_SD_BUF0, *p);
1315
1316         rest = data->blksz % 4;
1317         for (i = 0; i < (rest + 1) / 2; i++) {
1318                 u16 d;
1319                 ((u8 *)&d)[0] = ((u8 *)p)[2 * i];
1320                 if (rest > 1 && !i)
1321                         ((u8 *)&d)[1] = ((u8 *)p)[2 * i + 1];
1322                 else
1323                         ((u8 *)&d)[1] = 0;
1324                 usdhi6_write16(host, USDHI6_SD_BUF0, d);
1325         }
1326
1327         return 0;
1328
1329 error:
1330         dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data->error);
1331         host->wait = USDHI6_WAIT_FOR_REQUEST;
1332         return data->error;
1333 }
1334
1335 static int usdhi6_stop_cmd(struct usdhi6_host *host)
1336 {
1337         struct mmc_request *mrq = host->mrq;
1338
1339         switch (mrq->cmd->opcode) {
1340         case MMC_READ_MULTIPLE_BLOCK:
1341         case MMC_WRITE_MULTIPLE_BLOCK:
1342                 if (mrq->stop->opcode == MMC_STOP_TRANSMISSION) {
1343                         host->wait = USDHI6_WAIT_FOR_STOP;
1344                         return 0;
1345                 }
1346                 fallthrough;    /* Unsupported STOP command */
1347         default:
1348                 dev_err(mmc_dev(host->mmc),
1349                         "unsupported stop CMD%d for CMD%d\n",
1350                         mrq->stop->opcode, mrq->cmd->opcode);
1351                 mrq->stop->error = -EOPNOTSUPP;
1352         }
1353
1354         return -EOPNOTSUPP;
1355 }
1356
1357 static bool usdhi6_end_cmd(struct usdhi6_host *host)
1358 {
1359         struct mmc_request *mrq = host->mrq;
1360         struct mmc_command *cmd = mrq->cmd;
1361
1362         if (host->io_error) {
1363                 cmd->error = usdhi6_error_code(host);
1364                 return false;
1365         }
1366
1367         usdhi6_resp_read(host);
1368
1369         if (!mrq->data)
1370                 return false;
1371
1372         if (host->dma_active) {
1373                 usdhi6_dma_kick(host);
1374                 if (!mrq->stop)
1375                         host->wait = USDHI6_WAIT_FOR_DMA;
1376                 else if (usdhi6_stop_cmd(host) < 0)
1377                         return false;
1378         } else if (mrq->data->flags & MMC_DATA_READ) {
1379                 if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
1380                     (cmd->opcode == SD_IO_RW_EXTENDED &&
1381                      mrq->data->blocks > 1))
1382                         host->wait = USDHI6_WAIT_FOR_MREAD;
1383                 else
1384                         host->wait = USDHI6_WAIT_FOR_READ;
1385         } else {
1386                 if (cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK ||
1387                     (cmd->opcode == SD_IO_RW_EXTENDED &&
1388                      mrq->data->blocks > 1))
1389                         host->wait = USDHI6_WAIT_FOR_MWRITE;
1390                 else
1391                         host->wait = USDHI6_WAIT_FOR_WRITE;
1392         }
1393
1394         return true;
1395 }
1396
1397 static bool usdhi6_read_block(struct usdhi6_host *host)
1398 {
1399         /* ACCESS_END IRQ is already unmasked */
1400         int ret = usdhi6_blk_read(host);
1401
1402         /*
1403          * Have to force unmapping both pages: the single block could have been
1404          * cross-page, in which case for single-block IO host->page_idx == 0.
1405          * So, if we don't force, the second page won't be unmapped.
1406          */
1407         usdhi6_sg_unmap(host, true);
1408
1409         if (ret < 0)
1410                 return false;
1411
1412         host->wait = USDHI6_WAIT_FOR_DATA_END;
1413         return true;
1414 }
1415
1416 static bool usdhi6_mread_block(struct usdhi6_host *host)
1417 {
1418         int ret = usdhi6_blk_read(host);
1419
1420         if (ret < 0)
1421                 return false;
1422
1423         usdhi6_sg_advance(host);
1424
1425         return !host->mrq->data->error &&
1426                 (host->wait != USDHI6_WAIT_FOR_DATA_END || !host->mrq->stop);
1427 }
1428
1429 static bool usdhi6_write_block(struct usdhi6_host *host)
1430 {
1431         int ret = usdhi6_blk_write(host);
1432
1433         /* See comment in usdhi6_read_block() */
1434         usdhi6_sg_unmap(host, true);
1435
1436         if (ret < 0)
1437                 return false;
1438
1439         host->wait = USDHI6_WAIT_FOR_DATA_END;
1440         return true;
1441 }
1442
1443 static bool usdhi6_mwrite_block(struct usdhi6_host *host)
1444 {
1445         int ret = usdhi6_blk_write(host);
1446
1447         if (ret < 0)
1448                 return false;
1449
1450         usdhi6_sg_advance(host);
1451
1452         return !host->mrq->data->error &&
1453                 (host->wait != USDHI6_WAIT_FOR_DATA_END || !host->mrq->stop);
1454 }
1455
1456 /*                      Interrupt & timeout handlers                    */
1457
1458 static irqreturn_t usdhi6_sd_bh(int irq, void *dev_id)
1459 {
1460         struct usdhi6_host *host = dev_id;
1461         struct mmc_request *mrq;
1462         struct mmc_command *cmd;
1463         struct mmc_data *data;
1464         bool io_wait = false;
1465
1466         cancel_delayed_work_sync(&host->timeout_work);
1467
1468         mrq = host->mrq;
1469         if (!mrq)
1470                 return IRQ_HANDLED;
1471
1472         cmd = mrq->cmd;
1473         data = mrq->data;
1474
1475         switch (host->wait) {
1476         case USDHI6_WAIT_FOR_REQUEST:
1477                 /* We're too late, the timeout has already kicked in */
1478                 return IRQ_HANDLED;
1479         case USDHI6_WAIT_FOR_CMD:
1480                 /* Wait for data? */
1481                 io_wait = usdhi6_end_cmd(host);
1482                 break;
1483         case USDHI6_WAIT_FOR_MREAD:
1484                 /* Wait for more data? */
1485                 io_wait = usdhi6_mread_block(host);
1486                 break;
1487         case USDHI6_WAIT_FOR_READ:
1488                 /* Wait for data end? */
1489                 io_wait = usdhi6_read_block(host);
1490                 break;
1491         case USDHI6_WAIT_FOR_MWRITE:
1492                 /* Wait data to write? */
1493                 io_wait = usdhi6_mwrite_block(host);
1494                 break;
1495         case USDHI6_WAIT_FOR_WRITE:
1496                 /* Wait for data end? */
1497                 io_wait = usdhi6_write_block(host);
1498                 break;
1499         case USDHI6_WAIT_FOR_DMA:
1500                 usdhi6_dma_check_error(host);
1501                 break;
1502         case USDHI6_WAIT_FOR_STOP:
1503                 usdhi6_write(host, USDHI6_SD_STOP, 0);
1504                 if (host->io_error) {
1505                         int ret = usdhi6_error_code(host);
1506                         if (mrq->stop)
1507                                 mrq->stop->error = ret;
1508                         else
1509                                 mrq->data->error = ret;
1510                         dev_warn(mmc_dev(host->mmc), "%s(): %d\n", __func__, ret);
1511                         break;
1512                 }
1513                 usdhi6_resp_cmd12(host);
1514                 mrq->stop->error = 0;
1515                 break;
1516         case USDHI6_WAIT_FOR_DATA_END:
1517                 if (host->io_error) {
1518                         mrq->data->error = usdhi6_error_code(host);
1519                         dev_warn(mmc_dev(host->mmc), "%s(): %d\n", __func__,
1520                                  mrq->data->error);
1521                 }
1522                 break;
1523         default:
1524                 cmd->error = -EFAULT;
1525                 dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait);
1526                 usdhi6_request_done(host);
1527                 return IRQ_HANDLED;
1528         }
1529
1530         if (io_wait) {
1531                 schedule_delayed_work(&host->timeout_work, host->timeout);
1532                 /* Wait for more data or ACCESS_END */
1533                 if (!host->dma_active)
1534                         usdhi6_wait_for_brwe(host, mrq->data->flags & MMC_DATA_READ);
1535                 return IRQ_HANDLED;
1536         }
1537
1538         if (!cmd->error) {
1539                 if (data) {
1540                         if (!data->error) {
1541                                 if (host->wait != USDHI6_WAIT_FOR_STOP &&
1542                                     host->mrq->stop &&
1543                                     !host->mrq->stop->error &&
1544                                     !usdhi6_stop_cmd(host)) {
1545                                         /* Sending STOP */
1546                                         usdhi6_wait_for_resp(host);
1547
1548                                         schedule_delayed_work(&host->timeout_work,
1549                                                               host->timeout);
1550
1551                                         return IRQ_HANDLED;
1552                                 }
1553
1554                                 data->bytes_xfered = data->blocks * data->blksz;
1555                         } else {
1556                                 /* Data error: might need to unmap the last page */
1557                                 dev_warn(mmc_dev(host->mmc), "%s(): data error %d\n",
1558                                          __func__, data->error);
1559                                 usdhi6_sg_unmap(host, true);
1560                         }
1561                 } else if (cmd->opcode == MMC_APP_CMD) {
1562                         host->app_cmd = true;
1563                 }
1564         }
1565
1566         usdhi6_request_done(host);
1567
1568         return IRQ_HANDLED;
1569 }
1570
1571 static irqreturn_t usdhi6_sd(int irq, void *dev_id)
1572 {
1573         struct usdhi6_host *host = dev_id;
1574         u16 status, status2, error;
1575
1576         status = usdhi6_read(host, USDHI6_SD_INFO1) & ~host->status_mask &
1577                 ~USDHI6_SD_INFO1_CARD;
1578         status2 = usdhi6_read(host, USDHI6_SD_INFO2) & ~host->status2_mask;
1579
1580         usdhi6_only_cd(host);
1581
1582         dev_dbg(mmc_dev(host->mmc),
1583                 "IRQ status = 0x%08x, status2 = 0x%08x\n", status, status2);
1584
1585         if (!status && !status2)
1586                 return IRQ_NONE;
1587
1588         error = status2 & USDHI6_SD_INFO2_ERR;
1589
1590         /* Ack / clear interrupts */
1591         if (USDHI6_SD_INFO1_IRQ & status)
1592                 usdhi6_write(host, USDHI6_SD_INFO1,
1593                              0xffff & ~(USDHI6_SD_INFO1_IRQ & status));
1594
1595         if (USDHI6_SD_INFO2_IRQ & status2) {
1596                 if (error)
1597                         /* In error cases BWE and BRE aren't cleared automatically */
1598                         status2 |= USDHI6_SD_INFO2_BWE | USDHI6_SD_INFO2_BRE;
1599
1600                 usdhi6_write(host, USDHI6_SD_INFO2,
1601                              0xffff & ~(USDHI6_SD_INFO2_IRQ & status2));
1602         }
1603
1604         host->io_error = error;
1605         host->irq_status = status;
1606
1607         if (error) {
1608                 /* Don't pollute the log with unsupported command timeouts */
1609                 if (host->wait != USDHI6_WAIT_FOR_CMD ||
1610                     error != USDHI6_SD_INFO2_RSP_TOUT)
1611                         dev_warn(mmc_dev(host->mmc),
1612                                  "%s(): INFO2 error bits 0x%08x\n",
1613                                  __func__, error);
1614                 else
1615                         dev_dbg(mmc_dev(host->mmc),
1616                                 "%s(): INFO2 error bits 0x%08x\n",
1617                                 __func__, error);
1618         }
1619
1620         return IRQ_WAKE_THREAD;
1621 }
1622
1623 static irqreturn_t usdhi6_sdio(int irq, void *dev_id)
1624 {
1625         struct usdhi6_host *host = dev_id;
1626         u32 status = usdhi6_read(host, USDHI6_SDIO_INFO1) & ~host->sdio_mask;
1627
1628         dev_dbg(mmc_dev(host->mmc), "%s(): status 0x%x\n", __func__, status);
1629
1630         if (!status)
1631                 return IRQ_NONE;
1632
1633         usdhi6_write(host, USDHI6_SDIO_INFO1, ~status);
1634
1635         mmc_signal_sdio_irq(host->mmc);
1636
1637         return IRQ_HANDLED;
1638 }
1639
1640 static irqreturn_t usdhi6_cd(int irq, void *dev_id)
1641 {
1642         struct usdhi6_host *host = dev_id;
1643         struct mmc_host *mmc = host->mmc;
1644         u16 status;
1645
1646         /* We're only interested in hotplug events here */
1647         status = usdhi6_read(host, USDHI6_SD_INFO1) & ~host->status_mask &
1648                 USDHI6_SD_INFO1_CARD;
1649
1650         if (!status)
1651                 return IRQ_NONE;
1652
1653         /* Ack */
1654         usdhi6_write(host, USDHI6_SD_INFO1, ~status);
1655
1656         if (!work_pending(&mmc->detect.work) &&
1657             (((status & USDHI6_SD_INFO1_CARD_INSERT) &&
1658               !mmc->card) ||
1659              ((status & USDHI6_SD_INFO1_CARD_EJECT) &&
1660               mmc->card)))
1661                 mmc_detect_change(mmc, msecs_to_jiffies(100));
1662
1663         return IRQ_HANDLED;
1664 }
1665
1666 /*
1667  * Actually this should not be needed, if the built-in timeout works reliably in
1668  * the both PIO cases and DMA never fails. But if DMA does fail, a timeout
1669  * handler might be the only way to catch the error.
1670  */
1671 static void usdhi6_timeout_work(struct work_struct *work)
1672 {
1673         struct delayed_work *d = to_delayed_work(work);
1674         struct usdhi6_host *host = container_of(d, struct usdhi6_host, timeout_work);
1675         struct mmc_request *mrq = host->mrq;
1676         struct mmc_data *data = mrq ? mrq->data : NULL;
1677         struct scatterlist *sg;
1678
1679         dev_warn(mmc_dev(host->mmc),
1680                  "%s timeout wait %u CMD%d: IRQ 0x%08x:0x%08x, last IRQ 0x%08x\n",
1681                  host->dma_active ? "DMA" : "PIO",
1682                  host->wait, mrq ? mrq->cmd->opcode : -1,
1683                  usdhi6_read(host, USDHI6_SD_INFO1),
1684                  usdhi6_read(host, USDHI6_SD_INFO2), host->irq_status);
1685
1686         if (host->dma_active) {
1687                 usdhi6_dma_kill(host);
1688                 usdhi6_dma_stop_unmap(host);
1689         }
1690
1691         switch (host->wait) {
1692         default:
1693                 dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait);
1694                 fallthrough;    /* mrq can be NULL, but is impossible */
1695         case USDHI6_WAIT_FOR_CMD:
1696                 usdhi6_error_code(host);
1697                 if (mrq)
1698                         mrq->cmd->error = -ETIMEDOUT;
1699                 break;
1700         case USDHI6_WAIT_FOR_STOP:
1701                 usdhi6_error_code(host);
1702                 mrq->stop->error = -ETIMEDOUT;
1703                 break;
1704         case USDHI6_WAIT_FOR_DMA:
1705         case USDHI6_WAIT_FOR_MREAD:
1706         case USDHI6_WAIT_FOR_MWRITE:
1707         case USDHI6_WAIT_FOR_READ:
1708         case USDHI6_WAIT_FOR_WRITE:
1709                 sg = host->sg ?: data->sg;
1710                 dev_dbg(mmc_dev(host->mmc),
1711                         "%c: page #%u @ +0x%zx %ux%u in SG%u. Current SG %u bytes @ %u\n",
1712                         data->flags & MMC_DATA_READ ? 'R' : 'W', host->page_idx,
1713                         host->offset, data->blocks, data->blksz, data->sg_len,
1714                         sg_dma_len(sg), sg->offset);
1715                 usdhi6_sg_unmap(host, true);
1716                 fallthrough;    /* page unmapped in USDHI6_WAIT_FOR_DATA_END */
1717         case USDHI6_WAIT_FOR_DATA_END:
1718                 usdhi6_error_code(host);
1719                 data->error = -ETIMEDOUT;
1720         }
1721
1722         if (mrq)
1723                 usdhi6_request_done(host);
1724 }
1725
1726 /*                       Probe / release                                */
1727
1728 static const struct of_device_id usdhi6_of_match[] = {
1729         {.compatible = "renesas,usdhi6rol0"},
1730         {}
1731 };
1732 MODULE_DEVICE_TABLE(of, usdhi6_of_match);
1733
1734 static int usdhi6_probe(struct platform_device *pdev)
1735 {
1736         struct device *dev = &pdev->dev;
1737         struct mmc_host *mmc;
1738         struct usdhi6_host *host;
1739         struct resource *res;
1740         int irq_cd, irq_sd, irq_sdio;
1741         u32 version;
1742         int ret;
1743
1744         if (!dev->of_node)
1745                 return -ENODEV;
1746
1747         irq_cd = platform_get_irq_byname(pdev, "card detect");
1748         irq_sd = platform_get_irq_byname(pdev, "data");
1749         irq_sdio = platform_get_irq_byname(pdev, "SDIO");
1750         if (irq_sd < 0 || irq_sdio < 0)
1751                 return -ENODEV;
1752
1753         mmc = mmc_alloc_host(sizeof(struct usdhi6_host), dev);
1754         if (!mmc)
1755                 return -ENOMEM;
1756
1757         ret = mmc_regulator_get_supply(mmc);
1758         if (ret)
1759                 goto e_free_mmc;
1760
1761         ret = mmc_of_parse(mmc);
1762         if (ret < 0)
1763                 goto e_free_mmc;
1764
1765         host            = mmc_priv(mmc);
1766         host->mmc       = mmc;
1767         host->wait      = USDHI6_WAIT_FOR_REQUEST;
1768         host->timeout   = msecs_to_jiffies(USDHI6_REQ_TIMEOUT_MS);
1769         /*
1770          * We use a fixed timeout of 4s, hence inform the core about it. A
1771          * future improvement should instead respect the cmd->busy_timeout.
1772          */
1773         mmc->max_busy_timeout = USDHI6_REQ_TIMEOUT_MS;
1774
1775         host->pinctrl = devm_pinctrl_get(&pdev->dev);
1776         if (IS_ERR(host->pinctrl)) {
1777                 ret = PTR_ERR(host->pinctrl);
1778                 goto e_free_mmc;
1779         }
1780
1781         host->pins_uhs = pinctrl_lookup_state(host->pinctrl, "state_uhs");
1782
1783         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1784         host->base = devm_ioremap_resource(dev, res);
1785         if (IS_ERR(host->base)) {
1786                 ret = PTR_ERR(host->base);
1787                 goto e_free_mmc;
1788         }
1789
1790         host->clk = devm_clk_get(dev, NULL);
1791         if (IS_ERR(host->clk)) {
1792                 ret = PTR_ERR(host->clk);
1793                 goto e_free_mmc;
1794         }
1795
1796         host->imclk = clk_get_rate(host->clk);
1797
1798         ret = clk_prepare_enable(host->clk);
1799         if (ret < 0)
1800                 goto e_free_mmc;
1801
1802         version = usdhi6_read(host, USDHI6_VERSION);
1803         if ((version & 0xfff) != 0xa0d) {
1804                 ret = -EPERM;
1805                 dev_err(dev, "Version not recognized %x\n", version);
1806                 goto e_clk_off;
1807         }
1808
1809         dev_info(dev, "A USDHI6ROL0 SD host detected with %d ports\n",
1810                  usdhi6_read(host, USDHI6_SD_PORT_SEL) >> USDHI6_SD_PORT_SEL_PORTS_SHIFT);
1811
1812         usdhi6_mask_all(host);
1813
1814         if (irq_cd >= 0) {
1815                 ret = devm_request_irq(dev, irq_cd, usdhi6_cd, 0,
1816                                        dev_name(dev), host);
1817                 if (ret < 0)
1818                         goto e_clk_off;
1819         } else {
1820                 mmc->caps |= MMC_CAP_NEEDS_POLL;
1821         }
1822
1823         ret = devm_request_threaded_irq(dev, irq_sd, usdhi6_sd, usdhi6_sd_bh, 0,
1824                                dev_name(dev), host);
1825         if (ret < 0)
1826                 goto e_clk_off;
1827
1828         ret = devm_request_irq(dev, irq_sdio, usdhi6_sdio, 0,
1829                                dev_name(dev), host);
1830         if (ret < 0)
1831                 goto e_clk_off;
1832
1833         INIT_DELAYED_WORK(&host->timeout_work, usdhi6_timeout_work);
1834
1835         usdhi6_dma_request(host, res->start);
1836
1837         mmc->ops = &usdhi6_ops;
1838         mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
1839                      MMC_CAP_SDIO_IRQ;
1840         /* Set .max_segs to some random number. Feel free to adjust. */
1841         mmc->max_segs = 32;
1842         mmc->max_blk_size = 512;
1843         mmc->max_req_size = PAGE_SIZE * mmc->max_segs;
1844         mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size;
1845         /*
1846          * Setting .max_seg_size to 1 page would simplify our page-mapping code,
1847          * But OTOH, having large segments makes DMA more efficient. We could
1848          * check, whether we managed to get DMA and fall back to 1 page
1849          * segments, but if we do manage to obtain DMA and then it fails at
1850          * run-time and we fall back to PIO, we will continue getting large
1851          * segments. So, we wouldn't be able to get rid of the code anyway.
1852          */
1853         mmc->max_seg_size = mmc->max_req_size;
1854         if (!mmc->f_max)
1855                 mmc->f_max = host->imclk;
1856         mmc->f_min = host->imclk / 512;
1857
1858         platform_set_drvdata(pdev, host);
1859
1860         ret = mmc_add_host(mmc);
1861         if (ret < 0)
1862                 goto e_release_dma;
1863
1864         return 0;
1865
1866 e_release_dma:
1867         usdhi6_dma_release(host);
1868 e_clk_off:
1869         clk_disable_unprepare(host->clk);
1870 e_free_mmc:
1871         mmc_free_host(mmc);
1872
1873         return ret;
1874 }
1875
1876 static int usdhi6_remove(struct platform_device *pdev)
1877 {
1878         struct usdhi6_host *host = platform_get_drvdata(pdev);
1879
1880         mmc_remove_host(host->mmc);
1881
1882         usdhi6_mask_all(host);
1883         cancel_delayed_work_sync(&host->timeout_work);
1884         usdhi6_dma_release(host);
1885         clk_disable_unprepare(host->clk);
1886         mmc_free_host(host->mmc);
1887
1888         return 0;
1889 }
1890
1891 static struct platform_driver usdhi6_driver = {
1892         .probe          = usdhi6_probe,
1893         .remove         = usdhi6_remove,
1894         .driver         = {
1895                 .name   = "usdhi6rol0",
1896                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1897                 .of_match_table = usdhi6_of_match,
1898         },
1899 };
1900
1901 module_platform_driver(usdhi6_driver);
1902
1903 MODULE_DESCRIPTION("Renesas usdhi6rol0 SD/SDIO host driver");
1904 MODULE_LICENSE("GPL v2");
1905 MODULE_ALIAS("platform:usdhi6rol0");
1906 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");