drivers/mmc/host/renesas_sdhi_sys_dmac.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * DMA support use of SYS DMAC with SDHI SD/SDIO controller
   4  *
   5  * Copyright (C) 2016-19 Renesas Electronics Corporation
   6  * Copyright (C) 2016-19 Sang Engineering, Wolfram Sang
   7  * Copyright (C) 2017 Horms Solutions, Simon Horman
   8  * Copyright (C) 2010-2011 Guennadi Liakhovetski
   9  */
  10
  11 #include <linux/device.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/dmaengine.h>
  14 #include <linux/mfd/tmio.h>
  15 #include <linux/mmc/host.h>
  16 #include <linux/mod_devicetable.h>
  17 #include <linux/module.h>
  18 #include <linux/of_device.h>
  19 #include <linux/pagemap.h>
  20 #include <linux/scatterlist.h>
  21 #include <linux/sys_soc.h>
  22
  23 #include "renesas_sdhi.h"
  24 #include "tmio_mmc.h"
  25
  26 #define TMIO_MMC_MIN_DMA_LEN 8
  27
  28 static const struct renesas_sdhi_of_data of_default_cfg = {
  29         .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
  30 };
  31
  32 static const struct renesas_sdhi_of_data of_rz_compatible = {
  33         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_32BIT_DATA_PORT |
  34                           TMIO_MMC_HAVE_CBSY,
  35         .tmio_ocr_mask  = MMC_VDD_32_33,
  36         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
  37 };
  38
  39 static const struct renesas_sdhi_of_data of_rcar_gen1_compatible = {
  40         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL,
  41         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
  42         .capabilities2  = MMC_CAP2_NO_WRITE_PROTECT,
  43 };
  44
  45 /* Definitions for sampling clocks */
  46 static struct renesas_sdhi_scc rcar_gen2_scc_taps[] = {
  47         {
  48                 .clk_rate = 156000000,
  49                 .tap = 0x00000703,
  50         },
  51         {
  52                 .clk_rate = 0,
  53                 .tap = 0x00000300,
  54         },
  55 };
  56
  57 static const struct renesas_sdhi_of_data of_rcar_gen2_compatible = {
  58         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL |
  59                           TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2,
  60         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
  61                           MMC_CAP_CMD23,
  62         .capabilities2  = MMC_CAP2_NO_WRITE_PROTECT,
  63         .dma_buswidth   = DMA_SLAVE_BUSWIDTH_4_BYTES,
  64         .dma_rx_offset  = 0x2000,
  65         .scc_offset     = 0x0300,
  66         .taps           = rcar_gen2_scc_taps,
  67         .taps_num       = ARRAY_SIZE(rcar_gen2_scc_taps),
  68         .max_blk_count  = UINT_MAX / TMIO_MAX_BLK_SIZE,
  69 };
  70
  71 static const struct of_device_id renesas_sdhi_sys_dmac_of_match[] = {
  72         { .compatible = "renesas,sdhi-sh73a0", .data = &of_default_cfg, },
  73         { .compatible = "renesas,sdhi-r8a73a4", .data = &of_default_cfg, },
  74         { .compatible = "renesas,sdhi-r8a7740", .data = &of_default_cfg, },
  75         { .compatible = "renesas,sdhi-r7s72100", .data = &of_rz_compatible, },
  76         { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
  77         { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
  78         { .compatible = "renesas,sdhi-r8a7743", .data = &of_rcar_gen2_compatible, },
  79         { .compatible = "renesas,sdhi-r8a7745", .data = &of_rcar_gen2_compatible, },
  80         { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
  81         { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
  82         { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
  83         { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
  84         { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
  85         { .compatible = "renesas,rcar-gen1-sdhi", .data = &of_rcar_gen1_compatible, },
  86         { .compatible = "renesas,rcar-gen2-sdhi", .data = &of_rcar_gen2_compatible, },
  87         { .compatible = "renesas,sdhi-shmobile" },
  88         {},
  89 };
  90 MODULE_DEVICE_TABLE(of, renesas_sdhi_sys_dmac_of_match);
  91
  92 static void renesas_sdhi_sys_dmac_enable_dma(struct tmio_mmc_host *host,
  93                                              bool enable)
  94 {
  95         struct renesas_sdhi *priv = host_to_priv(host);
  96
  97         if (!host->chan_tx || !host->chan_rx)
  98                 return;
  99
 100         if (priv->dma_priv.enable)
 101                 priv->dma_priv.enable(host, enable);
 102 }
 103
 104 static void renesas_sdhi_sys_dmac_abort_dma(struct tmio_mmc_host *host)
 105 {
 106         renesas_sdhi_sys_dmac_enable_dma(host, false);
 107
 108         if (host->chan_rx)
 109                 dmaengine_terminate_all(host->chan_rx);
 110         if (host->chan_tx)
 111                 dmaengine_terminate_all(host->chan_tx);
 112
 113         renesas_sdhi_sys_dmac_enable_dma(host, true);
 114 }
 115
 116 static void renesas_sdhi_sys_dmac_dataend_dma(struct tmio_mmc_host *host)
 117 {
 118         struct renesas_sdhi *priv = host_to_priv(host);
 119
 120         complete(&priv->dma_priv.dma_dataend);
 121 }
 122
 123 static void renesas_sdhi_sys_dmac_dma_callback(void *arg)
 124 {
 125         struct tmio_mmc_host *host = arg;
 126         struct renesas_sdhi *priv = host_to_priv(host);
 127
 128         spin_lock_irq(&host->lock);
 129
 130         if (!host->data)
 131                 goto out;
 132
 133         if (host->data->flags & MMC_DATA_READ)
 134                 dma_unmap_sg(host->chan_rx->device->dev,
 135                              host->sg_ptr, host->sg_len,
 136                              DMA_FROM_DEVICE);
 137         else
 138                 dma_unmap_sg(host->chan_tx->device->dev,
 139                              host->sg_ptr, host->sg_len,
 140                              DMA_TO_DEVICE);
 141
 142         spin_unlock_irq(&host->lock);
 143
 144         wait_for_completion(&priv->dma_priv.dma_dataend);
 145
 146         spin_lock_irq(&host->lock);
 147         tmio_mmc_do_data_irq(host);
 148 out:
 149         spin_unlock_irq(&host->lock);
 150 }
 151
 152 static void renesas_sdhi_sys_dmac_start_dma_rx(struct tmio_mmc_host *host)
 153 {
 154         struct renesas_sdhi *priv = host_to_priv(host);
 155         struct scatterlist *sg = host->sg_ptr, *sg_tmp;
 156         struct dma_async_tx_descriptor *desc = NULL;
 157         struct dma_chan *chan = host->chan_rx;
 158         dma_cookie_t cookie;
 159         int ret, i;
 160         bool aligned = true, multiple = true;
 161         unsigned int align = (1 << host->pdata->alignment_shift) - 1;
 162
 163         for_each_sg(sg, sg_tmp, host->sg_len, i) {
 164                 if (sg_tmp->offset & align)
 165                         aligned = false;
 166                 if (sg_tmp->length & align) {
 167                         multiple = false;
 168                         break;
 169                 }
 170         }
 171
 172         if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
 173                           (align & PAGE_MASK))) || !multiple) {
 174                 ret = -EINVAL;
 175                 goto pio;
 176         }
 177
 178         if (sg->length < TMIO_MMC_MIN_DMA_LEN)
 179                 return;
 180
 181         /* The only sg element can be unaligned, use our bounce buffer then */
 182         if (!aligned) {
 183                 sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
 184                 host->sg_ptr = &host->bounce_sg;
 185                 sg = host->sg_ptr;
 186         }
 187
 188         ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE);
 189         if (ret > 0)
 190                 desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_DEV_TO_MEM,
 191                                                DMA_CTRL_ACK);
 192
 193         if (desc) {
 194                 reinit_completion(&priv->dma_priv.dma_dataend);
 195                 desc->callback = renesas_sdhi_sys_dmac_dma_callback;
 196                 desc->callback_param = host;
 197
 198                 cookie = dmaengine_submit(desc);
 199                 if (cookie < 0) {
 200                         desc = NULL;
 201                         ret = cookie;
 202                 }
 203                 host->dma_on = true;
 204         }
 205 pio:
 206         if (!desc) {
 207                 /* DMA failed, fall back to PIO */
 208                 renesas_sdhi_sys_dmac_enable_dma(host, false);
 209                 if (ret >= 0)
 210                         ret = -EIO;
 211                 host->chan_rx = NULL;
 212                 dma_release_channel(chan);
 213                 /* Free the Tx channel too */
 214                 chan = host->chan_tx;
 215                 if (chan) {
 216                         host->chan_tx = NULL;
 217                         dma_release_channel(chan);
 218                 }
 219                 dev_warn(&host->pdev->dev,
 220                          "DMA failed: %d, falling back to PIO\n", ret);
 221         }
 222 }
 223
 224 static void renesas_sdhi_sys_dmac_start_dma_tx(struct tmio_mmc_host *host)
 225 {
 226         struct renesas_sdhi *priv = host_to_priv(host);
 227         struct scatterlist *sg = host->sg_ptr, *sg_tmp;
 228         struct dma_async_tx_descriptor *desc = NULL;
 229         struct dma_chan *chan = host->chan_tx;
 230         dma_cookie_t cookie;
 231         int ret, i;
 232         bool aligned = true, multiple = true;
 233         unsigned int align = (1 << host->pdata->alignment_shift) - 1;
 234
 235         for_each_sg(sg, sg_tmp, host->sg_len, i) {
 236                 if (sg_tmp->offset & align)
 237                         aligned = false;
 238                 if (sg_tmp->length & align) {
 239                         multiple = false;
 240                         break;
 241                 }
 242         }
 243
 244         if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
 245                           (align & PAGE_MASK))) || !multiple) {
 246                 ret = -EINVAL;
 247                 goto pio;
 248         }
 249
 250         if (sg->length < TMIO_MMC_MIN_DMA_LEN)
 251                 return;
 252
 253         /* The only sg element can be unaligned, use our bounce buffer then */
 254         if (!aligned) {
 255                 unsigned long flags;
 256                 void *sg_vaddr = tmio_mmc_kmap_atomic(sg, &flags);
 257
 258                 sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
 259                 memcpy(host->bounce_buf, sg_vaddr, host->bounce_sg.length);
 260                 tmio_mmc_kunmap_atomic(sg, &flags, sg_vaddr);
 261                 host->sg_ptr = &host->bounce_sg;
 262                 sg = host->sg_ptr;
 263         }
 264
 265         ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE);
 266         if (ret > 0)
 267                 desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_MEM_TO_DEV,
 268                                                DMA_CTRL_ACK);
 269
 270         if (desc) {
 271                 reinit_completion(&priv->dma_priv.dma_dataend);
 272                 desc->callback = renesas_sdhi_sys_dmac_dma_callback;
 273                 desc->callback_param = host;
 274
 275                 cookie = dmaengine_submit(desc);
 276                 if (cookie < 0) {
 277                         desc = NULL;
 278                         ret = cookie;
 279                 }
 280                 host->dma_on = true;
 281         }
 282 pio:
 283         if (!desc) {
 284                 /* DMA failed, fall back to PIO */
 285                 renesas_sdhi_sys_dmac_enable_dma(host, false);
 286                 if (ret >= 0)
 287                         ret = -EIO;
 288                 host->chan_tx = NULL;
 289                 dma_release_channel(chan);
 290                 /* Free the Rx channel too */
 291                 chan = host->chan_rx;
 292                 if (chan) {
 293                         host->chan_rx = NULL;
 294                         dma_release_channel(chan);
 295                 }
 296                 dev_warn(&host->pdev->dev,
 297                          "DMA failed: %d, falling back to PIO\n", ret);
 298         }
 299 }
 300
 301 static void renesas_sdhi_sys_dmac_start_dma(struct tmio_mmc_host *host,
 302                                             struct mmc_data *data)
 303 {
 304         if (data->flags & MMC_DATA_READ) {
 305                 if (host->chan_rx)
 306                         renesas_sdhi_sys_dmac_start_dma_rx(host);
 307         } else {
 308                 if (host->chan_tx)
 309                         renesas_sdhi_sys_dmac_start_dma_tx(host);
 310         }
 311 }
 312
 313 static void renesas_sdhi_sys_dmac_issue_tasklet_fn(unsigned long priv)
 314 {
 315         struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv;
 316         struct dma_chan *chan = NULL;
 317
 318         spin_lock_irq(&host->lock);
 319
 320         if (host->data) {
 321                 if (host->data->flags & MMC_DATA_READ)
 322                         chan = host->chan_rx;
 323                 else
 324                         chan = host->chan_tx;
 325         }
 326
 327         spin_unlock_irq(&host->lock);
 328
 329         tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
 330
 331         if (chan)
 332                 dma_async_issue_pending(chan);
 333 }
 334
 335 static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
 336                                               struct tmio_mmc_data *pdata)
 337 {
 338         struct renesas_sdhi *priv = host_to_priv(host);
 339
 340         /* We can only either use DMA for both Tx and Rx or not use it at all */
 341         if (!host->pdev->dev.of_node &&
 342             (!pdata->chan_priv_tx || !pdata->chan_priv_rx))
 343                 return;
 344
 345         if (!host->chan_tx && !host->chan_rx) {
 346                 struct resource *res = platform_get_resource(host->pdev,
 347                                                              IORESOURCE_MEM, 0);
 348                 struct dma_slave_config cfg = {};
 349                 dma_cap_mask_t mask;
 350                 int ret;
 351
 352                 if (!res)
 353                         return;
 354
 355                 dma_cap_zero(mask);
 356                 dma_cap_set(DMA_SLAVE, mask);
 357
 358                 host->chan_tx = dma_request_slave_channel_compat(mask,
 359                                         priv->dma_priv.filter, pdata->chan_priv_tx,
 360                                         &host->pdev->dev, "tx");
 361                 dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__,
 362                         host->chan_tx);
 363
 364                 if (!host->chan_tx)
 365                         return;
 366
 367                 cfg.direction = DMA_MEM_TO_DEV;
 368                 cfg.dst_addr = res->start +
 369                         (CTL_SD_DATA_PORT << host->bus_shift);
 370                 cfg.dst_addr_width = priv->dma_priv.dma_buswidth;
 371                 if (!cfg.dst_addr_width)
 372                         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 373                 cfg.src_addr = 0;
 374                 ret = dmaengine_slave_config(host->chan_tx, &cfg);
 375                 if (ret < 0)
 376                         goto ecfgtx;
 377
 378                 host->chan_rx = dma_request_slave_channel_compat(mask,
 379                                         priv->dma_priv.filter, pdata->chan_priv_rx,
 380                                         &host->pdev->dev, "rx");
 381                 dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__,
 382                         host->chan_rx);
 383
 384                 if (!host->chan_rx)
 385                         goto ereqrx;
 386
 387                 cfg.direction = DMA_DEV_TO_MEM;
 388                 cfg.src_addr = cfg.dst_addr + host->pdata->dma_rx_offset;
 389                 cfg.src_addr_width = priv->dma_priv.dma_buswidth;
 390                 if (!cfg.src_addr_width)
 391                         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 392                 cfg.dst_addr = 0;
 393                 ret = dmaengine_slave_config(host->chan_rx, &cfg);
 394                 if (ret < 0)
 395                         goto ecfgrx;
 396
 397                 host->bounce_buf = (u8 *)__get_free_page(GFP_KERNEL | GFP_DMA);
 398                 if (!host->bounce_buf)
 399                         goto ebouncebuf;
 400
 401                 init_completion(&priv->dma_priv.dma_dataend);
 402                 tasklet_init(&host->dma_issue,
 403                              renesas_sdhi_sys_dmac_issue_tasklet_fn,
 404                              (unsigned long)host);
 405         }
 406
 407         renesas_sdhi_sys_dmac_enable_dma(host, true);
 408
 409         return;
 410
 411 ebouncebuf:
 412 ecfgrx:
 413         dma_release_channel(host->chan_rx);
 414         host->chan_rx = NULL;
 415 ereqrx:
 416 ecfgtx:
 417         dma_release_channel(host->chan_tx);
 418         host->chan_tx = NULL;
 419 }
 420
 421 static void renesas_sdhi_sys_dmac_release_dma(struct tmio_mmc_host *host)
 422 {
 423         if (host->chan_tx) {
 424                 struct dma_chan *chan = host->chan_tx;
 425
 426                 host->chan_tx = NULL;
 427                 dma_release_channel(chan);
 428         }
 429         if (host->chan_rx) {
 430                 struct dma_chan *chan = host->chan_rx;
 431
 432                 host->chan_rx = NULL;
 433                 dma_release_channel(chan);
 434         }
 435         if (host->bounce_buf) {
 436                 free_pages((unsigned long)host->bounce_buf, 0);
 437                 host->bounce_buf = NULL;
 438         }
 439 }
 440
 441 static const struct tmio_mmc_dma_ops renesas_sdhi_sys_dmac_dma_ops = {
 442         .start = renesas_sdhi_sys_dmac_start_dma,
 443         .enable = renesas_sdhi_sys_dmac_enable_dma,
 444         .request = renesas_sdhi_sys_dmac_request_dma,
 445         .release = renesas_sdhi_sys_dmac_release_dma,
 446         .abort = renesas_sdhi_sys_dmac_abort_dma,
 447         .dataend = renesas_sdhi_sys_dmac_dataend_dma,
 448 };
 449
 450 static int renesas_sdhi_sys_dmac_probe(struct platform_device *pdev)
 451 {
 452         return renesas_sdhi_probe(pdev, &renesas_sdhi_sys_dmac_dma_ops);
 453 }
 454
 455 static const struct dev_pm_ops renesas_sdhi_sys_dmac_dev_pm_ops = {
 456         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 457                                 pm_runtime_force_resume)
 458         SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
 459                            tmio_mmc_host_runtime_resume,
 460                            NULL)
 461 };
 462
 463 static struct platform_driver renesas_sys_dmac_sdhi_driver = {
 464         .driver         = {
 465                 .name   = "sh_mobile_sdhi",
 466                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 467                 .pm     = &renesas_sdhi_sys_dmac_dev_pm_ops,
 468                 .of_match_table = renesas_sdhi_sys_dmac_of_match,
 469         },
 470         .probe          = renesas_sdhi_sys_dmac_probe,
 471         .remove         = renesas_sdhi_remove,
 472 };
 473
 474 module_platform_driver(renesas_sys_dmac_sdhi_driver);
 475
 476 MODULE_DESCRIPTION("Renesas SDHI driver");
 477 MODULE_AUTHOR("Magnus Damm");
 478 MODULE_LICENSE("GPL v2");
 479 MODULE_ALIAS("platform:sh_mobile_sdhi");