1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * DMA support for Internal DMAC with SDHI SD/SDIO controller 4 * 5 * Copyright (C) 2016-19 Renesas Electronics Corporation 6 * Copyright (C) 2016-17 Horms Solutions, Simon Horman 7 * Copyright (C) 2018-19 Sang Engineering, Wolfram Sang 8 */ 9 10 #include <linux/bitops.h> 11 #include <linux/device.h> 12 #include <linux/dma-mapping.h> 13 #include <linux/io-64-nonatomic-hi-lo.h> 14 #include <linux/mmc/host.h> 15 #include <linux/mod_devicetable.h> 16 #include <linux/module.h> 17 #include <linux/of.h> 18 #include <linux/pagemap.h> 19 #include <linux/platform_data/tmio.h> 20 #include <linux/platform_device.h> 21 #include <linux/pm_runtime.h> 22 #include <linux/scatterlist.h> 23 #include <linux/sys_soc.h> 24 25 #include "renesas_sdhi.h" 26 #include "tmio_mmc.h" 27 28 #define DM_CM_DTRAN_MODE 0x820 29 #define DM_CM_DTRAN_CTRL 0x828 30 #define DM_CM_RST 0x830 31 #define DM_CM_INFO1 0x840 32 #define DM_CM_INFO1_MASK 0x848 33 #define DM_CM_INFO2 0x850 34 #define DM_CM_INFO2_MASK 0x858 35 #define DM_DTRAN_ADDR 0x880 36 37 /* DM_CM_DTRAN_MODE */ 38 #define DTRAN_MODE_CH_NUM_CH0 0 /* "downstream" = for write commands */ 39 #define DTRAN_MODE_CH_NUM_CH1 BIT(16) /* "upstream" = for read commands */ 40 #define DTRAN_MODE_BUS_WIDTH (BIT(5) | BIT(4)) 41 #define DTRAN_MODE_ADDR_MODE BIT(0) /* 1 = Increment address, 0 = Fixed */ 42 43 /* DM_CM_DTRAN_CTRL */ 44 #define DTRAN_CTRL_DM_START BIT(0) 45 46 /* DM_CM_RST */ 47 #define RST_DTRANRST1 BIT(9) 48 #define RST_DTRANRST0 BIT(8) 49 #define RST_RESERVED_BITS GENMASK_ULL(31, 0) 50 51 /* DM_CM_INFO1 and DM_CM_INFO1_MASK */ 52 #define INFO1_MASK_CLEAR GENMASK_ULL(31, 0) 53 #define INFO1_DTRANEND1 BIT(20) 54 #define INFO1_DTRANEND1_OLD BIT(17) 55 #define INFO1_DTRANEND0 BIT(16) 56 57 /* DM_CM_INFO2 and DM_CM_INFO2_MASK */ 58 #define INFO2_MASK_CLEAR GENMASK_ULL(31, 0) 59 #define INFO2_DTRANERR1 BIT(17) 60 #define INFO2_DTRANERR0 BIT(16) 61 62 enum renesas_sdhi_dma_cookie { 63 COOKIE_UNMAPPED, 64 COOKIE_PRE_MAPPED, 65 COOKIE_MAPPED, 66 }; 67 68 /* 69 * Specification of this driver: 70 * - host->chan_{rx,tx} will be used as a flag of enabling/disabling the dma 71 * - Since this SDHI DMAC register set has 16 but 32-bit width, we 72 * need a custom accessor. 73 */ 74 75 static unsigned long global_flags; 76 /* 77 * Workaround for avoiding to use RX DMAC by multiple channels. On R-Car M3-W 78 * ES1.0, when multiple SDHI channels use RX DMAC simultaneously, sometimes 79 * hundreds of data bytes are not stored into the system memory even if the 80 * DMAC interrupt happened. So, this driver then uses one RX DMAC channel only. 81 */ 82 #define SDHI_INTERNAL_DMAC_RX_IN_USE 0 83 84 /* Definitions for sampling clocks */ 85 static struct renesas_sdhi_scc rcar_gen3_scc_taps[] = { 86 { 87 .clk_rate = 0, 88 .tap = 0x00000300, 89 .tap_hs400_4tap = 0x00000100, 90 }, 91 }; 92 93 static const struct renesas_sdhi_of_data of_data_rza2 = { 94 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL | 95 TMIO_MMC_HAVE_CBSY, 96 .tmio_ocr_mask = MMC_VDD_32_33, 97 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ | 98 MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY, 99 .bus_shift = 2, 100 .scc_offset = 0 - 0x1000, 101 .taps = rcar_gen3_scc_taps, 102 .taps_num = ARRAY_SIZE(rcar_gen3_scc_taps), 103 /* DMAC can handle 32bit blk count but only 1 segment */ 104 .max_blk_count = UINT_MAX / TMIO_MAX_BLK_SIZE, 105 .max_segs = 1, 106 }; 107 108 static const struct renesas_sdhi_of_data of_data_rcar_gen3 = { 109 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL | 110 TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2, 111 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ | 112 MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY, 113 .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT | MMC_CAP2_MERGE_CAPABLE, 114 .bus_shift = 2, 115 .scc_offset = 0x1000, 116 .taps = rcar_gen3_scc_taps, 117 .taps_num = ARRAY_SIZE(rcar_gen3_scc_taps), 118 /* DMAC can handle 32bit blk count but only 1 segment */ 119 .max_blk_count = UINT_MAX / TMIO_MAX_BLK_SIZE, 120 .max_segs = 1, 121 .sdhi_flags = SDHI_FLAG_NEED_CLKH_FALLBACK, 122 }; 123 124 static const struct renesas_sdhi_of_data of_data_rcar_gen3_no_sdh_fallback = { 125 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL | 126 TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2, 127 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ | 128 MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY, 129 .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT | MMC_CAP2_MERGE_CAPABLE, 130 .bus_shift = 2, 131 .scc_offset = 0x1000, 132 .taps = rcar_gen3_scc_taps, 133 .taps_num = ARRAY_SIZE(rcar_gen3_scc_taps), 134 /* DMAC can handle 32bit blk count but only 1 segment */ 135 .max_blk_count = UINT_MAX / TMIO_MAX_BLK_SIZE, 136 .max_segs = 1, 137 }; 138 139 static const u8 r8a7796_es13_calib_table[2][SDHI_CALIB_TABLE_MAX] = { 140 { 3, 3, 3, 3, 3, 3, 3, 4, 4, 5, 6, 7, 8, 9, 10, 15, 141 16, 16, 16, 16, 16, 16, 17, 18, 18, 19, 20, 21, 22, 23, 24, 25 }, 142 { 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 7, 8, 11, 143 12, 17, 18, 18, 18, 18, 18, 18, 18, 19, 20, 21, 22, 23, 25, 25 } 144 }; 145 146 static const u8 r8a77965_calib_table[2][SDHI_CALIB_TABLE_MAX] = { 147 { 1, 2, 6, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 15, 15, 16, 148 17, 18, 19, 20, 21, 22, 23, 24, 25, 25, 26, 27, 28, 29, 30, 31 }, 149 { 2, 3, 4, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 150 17, 17, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 31, 31, 31 } 151 }; 152 153 static const u8 r8a77990_calib_table[2][SDHI_CALIB_TABLE_MAX] = { 154 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 155 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 156 { 0, 0, 0, 1, 2, 3, 3, 4, 4, 4, 5, 5, 6, 8, 9, 10, 157 11, 12, 13, 15, 16, 17, 17, 18, 18, 19, 20, 22, 24, 25, 26, 26 } 158 }; 159 160 static const struct renesas_sdhi_quirks sdhi_quirks_4tap_nohs400 = { 161 .hs400_disabled = true, 162 .hs400_4taps = true, 163 }; 164 165 static const struct renesas_sdhi_quirks sdhi_quirks_4tap_nohs400_one_rx = { 166 .hs400_disabled = true, 167 .hs400_4taps = true, 168 .dma_one_rx_only = true, 169 .old_info1_layout = true, 170 }; 171 172 static const struct renesas_sdhi_quirks sdhi_quirks_4tap = { 173 .hs400_4taps = true, 174 .hs400_bad_taps = BIT(2) | BIT(3) | BIT(6) | BIT(7), 175 .manual_tap_correction = true, 176 }; 177 178 static const struct renesas_sdhi_quirks sdhi_quirks_nohs400 = { 179 .hs400_disabled = true, 180 }; 181 182 static const struct renesas_sdhi_quirks sdhi_quirks_fixed_addr = { 183 .fixed_addr_mode = true, 184 }; 185 186 static const struct renesas_sdhi_quirks sdhi_quirks_bad_taps1357 = { 187 .hs400_bad_taps = BIT(1) | BIT(3) | BIT(5) | BIT(7), 188 .manual_tap_correction = true, 189 }; 190 191 static const struct renesas_sdhi_quirks sdhi_quirks_bad_taps2367 = { 192 .hs400_bad_taps = BIT(2) | BIT(3) | BIT(6) | BIT(7), 193 .manual_tap_correction = true, 194 }; 195 196 static const struct renesas_sdhi_quirks sdhi_quirks_r8a7796_es13 = { 197 .hs400_4taps = true, 198 .hs400_bad_taps = BIT(2) | BIT(3) | BIT(6) | BIT(7), 199 .hs400_calib_table = r8a7796_es13_calib_table, 200 .manual_tap_correction = true, 201 }; 202 203 static const struct renesas_sdhi_quirks sdhi_quirks_r8a77965 = { 204 .hs400_bad_taps = BIT(2) | BIT(3) | BIT(6) | BIT(7), 205 .hs400_calib_table = r8a77965_calib_table, 206 .manual_tap_correction = true, 207 }; 208 209 static const struct renesas_sdhi_quirks sdhi_quirks_r8a77990 = { 210 .hs400_calib_table = r8a77990_calib_table, 211 .manual_tap_correction = true, 212 }; 213 214 static const struct renesas_sdhi_quirks sdhi_quirks_rzg2l = { 215 .fixed_addr_mode = true, 216 .hs400_disabled = true, 217 }; 218 219 /* 220 * Note for r8a7796 / r8a774a1: we can't distinguish ES1.1 and 1.2 as of now. 221 * So, we want to treat them equally and only have a match for ES1.2 to enforce 222 * this if there ever will be a way to distinguish ES1.2. 223 */ 224 static const struct soc_device_attribute sdhi_quirks_match[] = { 225 { .soc_id = "r8a774a1", .revision = "ES1.[012]", .data = &sdhi_quirks_4tap_nohs400 }, 226 { .soc_id = "r8a7795", .revision = "ES2.0", .data = &sdhi_quirks_4tap }, 227 { .soc_id = "r8a7796", .revision = "ES1.0", .data = &sdhi_quirks_4tap_nohs400_one_rx }, 228 { .soc_id = "r8a7796", .revision = "ES1.[12]", .data = &sdhi_quirks_4tap_nohs400 }, 229 { .soc_id = "r8a7796", .revision = "ES1.*", .data = &sdhi_quirks_r8a7796_es13 }, 230 { .soc_id = "r8a77980", .revision = "ES1.*", .data = &sdhi_quirks_nohs400 }, 231 { /* Sentinel. */ } 232 }; 233 234 static const struct renesas_sdhi_of_data_with_quirks of_r8a7795_compatible = { 235 .of_data = &of_data_rcar_gen3, 236 .quirks = &sdhi_quirks_bad_taps2367, 237 }; 238 239 static const struct renesas_sdhi_of_data_with_quirks of_r8a77961_compatible = { 240 .of_data = &of_data_rcar_gen3, 241 .quirks = &sdhi_quirks_bad_taps1357, 242 }; 243 244 static const struct renesas_sdhi_of_data_with_quirks of_r8a77965_compatible = { 245 .of_data = &of_data_rcar_gen3, 246 .quirks = &sdhi_quirks_r8a77965, 247 }; 248 249 static const struct renesas_sdhi_of_data_with_quirks of_r8a77970_compatible = { 250 .of_data = &of_data_rcar_gen3_no_sdh_fallback, 251 .quirks = &sdhi_quirks_nohs400, 252 }; 253 254 static const struct renesas_sdhi_of_data_with_quirks of_r8a77990_compatible = { 255 .of_data = &of_data_rcar_gen3, 256 .quirks = &sdhi_quirks_r8a77990, 257 }; 258 259 static const struct renesas_sdhi_of_data_with_quirks of_rzg2l_compatible = { 260 .of_data = &of_data_rcar_gen3, 261 .quirks = &sdhi_quirks_rzg2l, 262 }; 263 264 static const struct renesas_sdhi_of_data_with_quirks of_rcar_gen3_compatible = { 265 .of_data = &of_data_rcar_gen3, 266 }; 267 268 static const struct renesas_sdhi_of_data_with_quirks of_rcar_gen3_nohs400_compatible = { 269 .of_data = &of_data_rcar_gen3, 270 .quirks = &sdhi_quirks_nohs400, 271 }; 272 273 static const struct renesas_sdhi_of_data_with_quirks of_rza2_compatible = { 274 .of_data = &of_data_rza2, 275 .quirks = &sdhi_quirks_fixed_addr, 276 }; 277 278 static const struct of_device_id renesas_sdhi_internal_dmac_of_match[] = { 279 { .compatible = "renesas,sdhi-r7s9210", .data = &of_rza2_compatible, }, 280 { .compatible = "renesas,sdhi-mmc-r8a77470", .data = &of_rcar_gen3_compatible, }, 281 { .compatible = "renesas,sdhi-r8a7795", .data = &of_r8a7795_compatible, }, 282 { .compatible = "renesas,sdhi-r8a77961", .data = &of_r8a77961_compatible, }, 283 { .compatible = "renesas,sdhi-r8a77965", .data = &of_r8a77965_compatible, }, 284 { .compatible = "renesas,sdhi-r8a77970", .data = &of_r8a77970_compatible, }, 285 { .compatible = "renesas,sdhi-r8a77990", .data = &of_r8a77990_compatible, }, 286 { .compatible = "renesas,sdhi-r8a77995", .data = &of_rcar_gen3_nohs400_compatible, }, 287 { .compatible = "renesas,sdhi-r9a09g011", .data = &of_rzg2l_compatible, }, 288 { .compatible = "renesas,sdhi-r9a09g057", .data = &of_rzg2l_compatible, }, 289 { .compatible = "renesas,rzg2l-sdhi", .data = &of_rzg2l_compatible, }, 290 { .compatible = "renesas,rcar-gen3-sdhi", .data = &of_rcar_gen3_compatible, }, 291 { .compatible = "renesas,rcar-gen4-sdhi", .data = &of_rcar_gen3_compatible, }, 292 {}, 293 }; 294 MODULE_DEVICE_TABLE(of, renesas_sdhi_internal_dmac_of_match); 295 296 static void 297 renesas_sdhi_internal_dmac_enable_dma(struct tmio_mmc_host *host, bool enable) 298 { 299 struct renesas_sdhi *priv = host_to_priv(host); 300 u32 dma_irqs = INFO1_DTRANEND0 | 301 (sdhi_has_quirk(priv, old_info1_layout) ? 302 INFO1_DTRANEND1_OLD : INFO1_DTRANEND1); 303 304 if (!host->chan_tx || !host->chan_rx) 305 return; 306 307 writel(enable ? ~dma_irqs : INFO1_MASK_CLEAR, host->ctl + DM_CM_INFO1_MASK); 308 309 if (priv->dma_priv.enable) 310 priv->dma_priv.enable(host, enable); 311 } 312 313 static void 314 renesas_sdhi_internal_dmac_abort_dma(struct tmio_mmc_host *host) 315 { 316 u64 val = RST_DTRANRST1 | RST_DTRANRST0; 317 318 renesas_sdhi_internal_dmac_enable_dma(host, false); 319 320 writel(RST_RESERVED_BITS & ~val, host->ctl + DM_CM_RST); 321 writel(RST_RESERVED_BITS | val, host->ctl + DM_CM_RST); 322 323 clear_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags); 324 325 renesas_sdhi_internal_dmac_enable_dma(host, true); 326 } 327 328 static bool renesas_sdhi_internal_dmac_dma_irq(struct tmio_mmc_host *host) 329 { 330 struct renesas_sdhi *priv = host_to_priv(host); 331 struct renesas_sdhi_dma *dma_priv = &priv->dma_priv; 332 333 u32 dma_irqs = INFO1_DTRANEND0 | 334 (sdhi_has_quirk(priv, old_info1_layout) ? 335 INFO1_DTRANEND1_OLD : INFO1_DTRANEND1); 336 u32 status = readl(host->ctl + DM_CM_INFO1); 337 338 if (status & dma_irqs) { 339 writel(status ^ dma_irqs, host->ctl + DM_CM_INFO1); 340 set_bit(SDHI_DMA_END_FLAG_DMA, &dma_priv->end_flags); 341 if (test_bit(SDHI_DMA_END_FLAG_ACCESS, &dma_priv->end_flags)) 342 queue_work(system_bh_wq, &dma_priv->dma_complete); 343 } 344 345 return status & dma_irqs; 346 } 347 348 static void 349 renesas_sdhi_internal_dmac_dataend_dma(struct tmio_mmc_host *host) 350 { 351 struct renesas_sdhi *priv = host_to_priv(host); 352 struct renesas_sdhi_dma *dma_priv = &priv->dma_priv; 353 354 set_bit(SDHI_DMA_END_FLAG_ACCESS, &dma_priv->end_flags); 355 if (test_bit(SDHI_DMA_END_FLAG_DMA, &dma_priv->end_flags) || 356 host->data->error) 357 queue_work(system_bh_wq, &dma_priv->dma_complete); 358 } 359 360 /* 361 * renesas_sdhi_internal_dmac_map() will be called with two different 362 * sg pointers in two mmc_data by .pre_req(), but tmio host can have a single 363 * sg_ptr only. So, renesas_sdhi_internal_dmac_{un}map() should use a sg 364 * pointer in a mmc_data instead of host->sg_ptr. 365 */ 366 static void 367 renesas_sdhi_internal_dmac_unmap(struct tmio_mmc_host *host, 368 struct mmc_data *data, 369 enum renesas_sdhi_dma_cookie cookie) 370 { 371 bool unmap = cookie == COOKIE_UNMAPPED ? (data->host_cookie != cookie) : 372 (data->host_cookie == cookie); 373 374 if (unmap) { 375 dma_unmap_sg(&host->pdev->dev, data->sg, data->sg_len, 376 mmc_get_dma_dir(data)); 377 data->host_cookie = COOKIE_UNMAPPED; 378 } 379 } 380 381 static bool 382 renesas_sdhi_internal_dmac_map(struct tmio_mmc_host *host, 383 struct mmc_data *data, 384 enum renesas_sdhi_dma_cookie cookie) 385 { 386 if (data->host_cookie == COOKIE_PRE_MAPPED) 387 return true; 388 389 if (!dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, 390 mmc_get_dma_dir(data))) 391 return false; 392 393 data->host_cookie = cookie; 394 395 /* This DMAC needs buffers to be 128-byte aligned */ 396 if (!IS_ALIGNED(sg_dma_address(data->sg), 128)) { 397 renesas_sdhi_internal_dmac_unmap(host, data, cookie); 398 return false; 399 } 400 401 return true; 402 } 403 404 static void 405 renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host *host, 406 struct mmc_data *data) 407 { 408 struct renesas_sdhi *priv = host_to_priv(host); 409 struct scatterlist *sg = host->sg_ptr; 410 u32 dtran_mode = DTRAN_MODE_BUS_WIDTH; 411 412 if (!sdhi_has_quirk(priv, fixed_addr_mode)) 413 dtran_mode |= DTRAN_MODE_ADDR_MODE; 414 415 if (!renesas_sdhi_internal_dmac_map(host, data, COOKIE_MAPPED)) 416 goto force_pio; 417 418 if (data->flags & MMC_DATA_READ) { 419 dtran_mode |= DTRAN_MODE_CH_NUM_CH1; 420 if (sdhi_has_quirk(priv, dma_one_rx_only) && 421 test_and_set_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags)) 422 goto force_pio_with_unmap; 423 } else { 424 dtran_mode |= DTRAN_MODE_CH_NUM_CH0; 425 } 426 427 priv->dma_priv.end_flags = 0; 428 renesas_sdhi_internal_dmac_enable_dma(host, true); 429 430 /* set dma parameters */ 431 writel(dtran_mode, host->ctl + DM_CM_DTRAN_MODE); 432 writel(sg_dma_address(sg), host->ctl + DM_DTRAN_ADDR); 433 434 host->dma_on = true; 435 436 return; 437 438 force_pio_with_unmap: 439 renesas_sdhi_internal_dmac_unmap(host, data, COOKIE_UNMAPPED); 440 441 force_pio: 442 renesas_sdhi_internal_dmac_enable_dma(host, false); 443 } 444 445 static void renesas_sdhi_internal_dmac_issue_work_fn(struct work_struct *work) 446 { 447 struct tmio_mmc_host *host = from_work(host, work, dma_issue); 448 struct renesas_sdhi *priv = host_to_priv(host); 449 450 tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND); 451 452 if (!host->cmd->error) { 453 /* start the DMAC */ 454 writel(DTRAN_CTRL_DM_START, host->ctl + DM_CM_DTRAN_CTRL); 455 } else { 456 /* on CMD errors, simulate DMA end immediately */ 457 set_bit(SDHI_DMA_END_FLAG_DMA, &priv->dma_priv.end_flags); 458 if (test_bit(SDHI_DMA_END_FLAG_ACCESS, &priv->dma_priv.end_flags)) 459 queue_work(system_bh_wq, &priv->dma_priv.dma_complete); 460 } 461 } 462 463 static bool renesas_sdhi_internal_dmac_complete(struct tmio_mmc_host *host) 464 { 465 enum dma_data_direction dir; 466 467 if (!host->dma_on) 468 return false; 469 470 if (!host->data) 471 return false; 472 473 if (host->data->flags & MMC_DATA_READ) 474 dir = DMA_FROM_DEVICE; 475 else 476 dir = DMA_TO_DEVICE; 477 478 renesas_sdhi_internal_dmac_enable_dma(host, false); 479 renesas_sdhi_internal_dmac_unmap(host, host->data, COOKIE_MAPPED); 480 481 if (dir == DMA_FROM_DEVICE) 482 clear_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags); 483 484 host->dma_on = false; 485 486 return true; 487 } 488 489 static void renesas_sdhi_internal_dmac_complete_work_fn(struct work_struct *work) 490 { 491 struct renesas_sdhi_dma *dma_priv = from_work(dma_priv, work, dma_complete); 492 struct renesas_sdhi *priv = container_of(dma_priv, typeof(*priv), dma_priv); 493 struct tmio_mmc_host *host = priv->host; 494 495 spin_lock_irq(&host->lock); 496 if (!renesas_sdhi_internal_dmac_complete(host)) 497 goto out; 498 499 tmio_mmc_do_data_irq(host); 500 out: 501 spin_unlock_irq(&host->lock); 502 } 503 504 static void renesas_sdhi_internal_dmac_end_dma(struct tmio_mmc_host *host) 505 { 506 if (host->data) 507 renesas_sdhi_internal_dmac_complete(host); 508 } 509 510 static void renesas_sdhi_internal_dmac_post_req(struct mmc_host *mmc, 511 struct mmc_request *mrq, 512 int err) 513 { 514 struct tmio_mmc_host *host = mmc_priv(mmc); 515 struct mmc_data *data = mrq->data; 516 517 if (!data) 518 return; 519 520 renesas_sdhi_internal_dmac_unmap(host, data, COOKIE_UNMAPPED); 521 } 522 523 static void renesas_sdhi_internal_dmac_pre_req(struct mmc_host *mmc, 524 struct mmc_request *mrq) 525 { 526 struct tmio_mmc_host *host = mmc_priv(mmc); 527 struct mmc_data *data = mrq->data; 528 529 if (!data) 530 return; 531 532 data->host_cookie = COOKIE_UNMAPPED; 533 renesas_sdhi_internal_dmac_map(host, data, COOKIE_PRE_MAPPED); 534 } 535 536 static void 537 renesas_sdhi_internal_dmac_request_dma(struct tmio_mmc_host *host, 538 struct tmio_mmc_data *pdata) 539 { 540 struct renesas_sdhi *priv = host_to_priv(host); 541 542 /* Disable DMAC interrupts initially */ 543 writel(INFO1_MASK_CLEAR, host->ctl + DM_CM_INFO1_MASK); 544 writel(INFO2_MASK_CLEAR, host->ctl + DM_CM_INFO2_MASK); 545 writel(0, host->ctl + DM_CM_INFO1); 546 writel(0, host->ctl + DM_CM_INFO2); 547 548 /* Each value is set to non-zero to assume "enabling" each DMA */ 549 host->chan_rx = host->chan_tx = (void *)0xdeadbeaf; 550 551 INIT_WORK(&priv->dma_priv.dma_complete, 552 renesas_sdhi_internal_dmac_complete_work_fn); 553 INIT_WORK(&host->dma_issue, 554 renesas_sdhi_internal_dmac_issue_work_fn); 555 556 /* Add pre_req and post_req */ 557 host->ops.pre_req = renesas_sdhi_internal_dmac_pre_req; 558 host->ops.post_req = renesas_sdhi_internal_dmac_post_req; 559 } 560 561 static void 562 renesas_sdhi_internal_dmac_release_dma(struct tmio_mmc_host *host) 563 { 564 /* Each value is set to zero to assume "disabling" each DMA */ 565 host->chan_rx = host->chan_tx = NULL; 566 } 567 568 static const struct tmio_mmc_dma_ops renesas_sdhi_internal_dmac_dma_ops = { 569 .start = renesas_sdhi_internal_dmac_start_dma, 570 .enable = renesas_sdhi_internal_dmac_enable_dma, 571 .request = renesas_sdhi_internal_dmac_request_dma, 572 .release = renesas_sdhi_internal_dmac_release_dma, 573 .abort = renesas_sdhi_internal_dmac_abort_dma, 574 .dataend = renesas_sdhi_internal_dmac_dataend_dma, 575 .end = renesas_sdhi_internal_dmac_end_dma, 576 .dma_irq = renesas_sdhi_internal_dmac_dma_irq, 577 }; 578 579 static int renesas_sdhi_internal_dmac_probe(struct platform_device *pdev) 580 { 581 const struct soc_device_attribute *attr; 582 const struct renesas_sdhi_of_data_with_quirks *of_data_quirks; 583 const struct renesas_sdhi_quirks *quirks; 584 struct device *dev = &pdev->dev; 585 586 of_data_quirks = of_device_get_match_data(&pdev->dev); 587 quirks = of_data_quirks->quirks; 588 589 attr = soc_device_match(sdhi_quirks_match); 590 if (attr) 591 quirks = attr->data; 592 593 /* value is max of SD_SECCNT. Confirmed by HW engineers */ 594 dma_set_max_seg_size(dev, 0xffffffff); 595 596 return renesas_sdhi_probe(pdev, &renesas_sdhi_internal_dmac_dma_ops, 597 of_data_quirks->of_data, quirks); 598 } 599 600 static const struct dev_pm_ops renesas_sdhi_internal_dmac_dev_pm_ops = { 601 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 602 pm_runtime_force_resume) 603 SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend, 604 tmio_mmc_host_runtime_resume, 605 NULL) 606 }; 607 608 static struct platform_driver renesas_internal_dmac_sdhi_driver = { 609 .driver = { 610 .name = "renesas_sdhi_internal_dmac", 611 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 612 .pm = &renesas_sdhi_internal_dmac_dev_pm_ops, 613 .of_match_table = renesas_sdhi_internal_dmac_of_match, 614 }, 615 .probe = renesas_sdhi_internal_dmac_probe, 616 .remove = renesas_sdhi_remove, 617 }; 618 619 module_platform_driver(renesas_internal_dmac_sdhi_driver); 620 621 MODULE_DESCRIPTION("Renesas SDHI driver for internal DMAC"); 622 MODULE_AUTHOR("Yoshihiro Shimoda"); 623 MODULE_LICENSE("GPL v2"); 624