1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Actions Semi Owl SoCs SD/MMC driver 4 * 5 * Copyright (c) 2014 Actions Semi Inc. 6 * Copyright (c) 2019 Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> 7 * 8 * TODO: SDIO support 9 */ 10 11 #include <linux/clk.h> 12 #include <linux/delay.h> 13 #include <linux/dmaengine.h> 14 #include <linux/dma-direction.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/interrupt.h> 17 #include <linux/mmc/host.h> 18 #include <linux/mmc/slot-gpio.h> 19 #include <linux/module.h> 20 #include <linux/of_platform.h> 21 #include <linux/reset.h> 22 #include <linux/spinlock.h> 23 24 /* 25 * SDC registers 26 */ 27 #define OWL_REG_SD_EN 0x0000 28 #define OWL_REG_SD_CTL 0x0004 29 #define OWL_REG_SD_STATE 0x0008 30 #define OWL_REG_SD_CMD 0x000c 31 #define OWL_REG_SD_ARG 0x0010 32 #define OWL_REG_SD_RSPBUF0 0x0014 33 #define OWL_REG_SD_RSPBUF1 0x0018 34 #define OWL_REG_SD_RSPBUF2 0x001c 35 #define OWL_REG_SD_RSPBUF3 0x0020 36 #define OWL_REG_SD_RSPBUF4 0x0024 37 #define OWL_REG_SD_DAT 0x0028 38 #define OWL_REG_SD_BLK_SIZE 0x002c 39 #define OWL_REG_SD_BLK_NUM 0x0030 40 #define OWL_REG_SD_BUF_SIZE 0x0034 41 42 /* SD_EN Bits */ 43 #define OWL_SD_EN_RANE BIT(31) 44 #define OWL_SD_EN_RAN_SEED(x) (((x) & 0x3f) << 24) 45 #define OWL_SD_EN_S18EN BIT(12) 46 #define OWL_SD_EN_RESE BIT(10) 47 #define OWL_SD_EN_DAT1_S BIT(9) 48 #define OWL_SD_EN_CLK_S BIT(8) 49 #define OWL_SD_ENABLE BIT(7) 50 #define OWL_SD_EN_BSEL BIT(6) 51 #define OWL_SD_EN_SDIOEN BIT(3) 52 #define OWL_SD_EN_DDREN BIT(2) 53 #define OWL_SD_EN_DATAWID(x) (((x) & 0x3) << 0) 54 55 /* SD_CTL Bits */ 56 #define OWL_SD_CTL_TOUTEN BIT(31) 57 #define OWL_SD_CTL_TOUTCNT(x) (((x) & 0x7f) << 24) 58 #define OWL_SD_CTL_DELAY_MSK GENMASK(23, 16) 59 #define OWL_SD_CTL_RDELAY(x) (((x) & 0xf) << 20) 60 #define OWL_SD_CTL_WDELAY(x) (((x) & 0xf) << 16) 61 #define OWL_SD_CTL_CMDLEN BIT(13) 62 #define OWL_SD_CTL_SCC BIT(12) 63 #define OWL_SD_CTL_TCN(x) (((x) & 0xf) << 8) 64 #define OWL_SD_CTL_TS BIT(7) 65 #define OWL_SD_CTL_LBE BIT(6) 66 #define OWL_SD_CTL_C7EN BIT(5) 67 #define OWL_SD_CTL_TM(x) (((x) & 0xf) << 0) 68 69 #define OWL_SD_DELAY_LOW_CLK 0x0f 70 #define OWL_SD_DELAY_MID_CLK 0x0a 71 #define OWL_SD_DELAY_HIGH_CLK 0x09 72 #define OWL_SD_RDELAY_DDR50 0x0a 73 #define OWL_SD_WDELAY_DDR50 0x08 74 75 /* SD_STATE Bits */ 76 #define OWL_SD_STATE_DAT1BS BIT(18) 77 #define OWL_SD_STATE_SDIOB_P BIT(17) 78 #define OWL_SD_STATE_SDIOB_EN BIT(16) 79 #define OWL_SD_STATE_TOUTE BIT(15) 80 #define OWL_SD_STATE_BAEP BIT(14) 81 #define OWL_SD_STATE_MEMRDY BIT(12) 82 #define OWL_SD_STATE_CMDS BIT(11) 83 #define OWL_SD_STATE_DAT1AS BIT(10) 84 #define OWL_SD_STATE_SDIOA_P BIT(9) 85 #define OWL_SD_STATE_SDIOA_EN BIT(8) 86 #define OWL_SD_STATE_DAT0S BIT(7) 87 #define OWL_SD_STATE_TEIE BIT(6) 88 #define OWL_SD_STATE_TEI BIT(5) 89 #define OWL_SD_STATE_CLNR BIT(4) 90 #define OWL_SD_STATE_CLC BIT(3) 91 #define OWL_SD_STATE_WC16ER BIT(2) 92 #define OWL_SD_STATE_RC16ER BIT(1) 93 #define OWL_SD_STATE_CRC7ER BIT(0) 94 95 #define OWL_CMD_TIMEOUT_MS 30000 96 97 struct owl_mmc_host { 98 struct device *dev; 99 struct reset_control *reset; 100 void __iomem *base; 101 struct clk *clk; 102 struct completion sdc_complete; 103 spinlock_t lock; 104 int irq; 105 u32 clock; 106 bool ddr_50; 107 108 enum dma_data_direction dma_dir; 109 struct dma_chan *dma; 110 struct dma_async_tx_descriptor *desc; 111 struct dma_slave_config dma_cfg; 112 struct completion dma_complete; 113 114 struct mmc_host *mmc; 115 struct mmc_request *mrq; 116 struct mmc_command *cmd; 117 struct mmc_data *data; 118 }; 119 120 static void owl_mmc_update_reg(void __iomem *reg, unsigned int val, bool state) 121 { 122 unsigned int regval; 123 124 regval = readl(reg); 125 126 if (state) 127 regval |= val; 128 else 129 regval &= ~val; 130 131 writel(regval, reg); 132 } 133 134 static irqreturn_t owl_irq_handler(int irq, void *devid) 135 { 136 struct owl_mmc_host *owl_host = devid; 137 u32 state; 138 139 spin_lock(&owl_host->lock); 140 141 state = readl(owl_host->base + OWL_REG_SD_STATE); 142 if (state & OWL_SD_STATE_TEI) { 143 state = readl(owl_host->base + OWL_REG_SD_STATE); 144 state |= OWL_SD_STATE_TEI; 145 writel(state, owl_host->base + OWL_REG_SD_STATE); 146 complete(&owl_host->sdc_complete); 147 } 148 149 spin_unlock(&owl_host->lock); 150 151 return IRQ_HANDLED; 152 } 153 154 static void owl_mmc_finish_request(struct owl_mmc_host *owl_host) 155 { 156 struct mmc_request *mrq = owl_host->mrq; 157 struct mmc_data *data = mrq->data; 158 159 /* Should never be NULL */ 160 WARN_ON(!mrq); 161 162 owl_host->mrq = NULL; 163 164 if (data) 165 dma_unmap_sg(owl_host->dma->device->dev, data->sg, data->sg_len, 166 owl_host->dma_dir); 167 168 /* Finally finish request */ 169 mmc_request_done(owl_host->mmc, mrq); 170 } 171 172 static void owl_mmc_send_cmd(struct owl_mmc_host *owl_host, 173 struct mmc_command *cmd, 174 struct mmc_data *data) 175 { 176 unsigned long timeout; 177 u32 mode, state, resp[2]; 178 u32 cmd_rsp_mask = 0; 179 180 init_completion(&owl_host->sdc_complete); 181 182 switch (mmc_resp_type(cmd)) { 183 case MMC_RSP_NONE: 184 mode = OWL_SD_CTL_TM(0); 185 break; 186 187 case MMC_RSP_R1: 188 if (data) { 189 if (data->flags & MMC_DATA_READ) 190 mode = OWL_SD_CTL_TM(4); 191 else 192 mode = OWL_SD_CTL_TM(5); 193 } else { 194 mode = OWL_SD_CTL_TM(1); 195 } 196 cmd_rsp_mask = OWL_SD_STATE_CLNR | OWL_SD_STATE_CRC7ER; 197 198 break; 199 200 case MMC_RSP_R1B: 201 mode = OWL_SD_CTL_TM(3); 202 cmd_rsp_mask = OWL_SD_STATE_CLNR | OWL_SD_STATE_CRC7ER; 203 break; 204 205 case MMC_RSP_R2: 206 mode = OWL_SD_CTL_TM(2); 207 cmd_rsp_mask = OWL_SD_STATE_CLNR | OWL_SD_STATE_CRC7ER; 208 break; 209 210 case MMC_RSP_R3: 211 mode = OWL_SD_CTL_TM(1); 212 cmd_rsp_mask = OWL_SD_STATE_CLNR; 213 break; 214 215 default: 216 dev_warn(owl_host->dev, "Unknown MMC command\n"); 217 cmd->error = -EINVAL; 218 return; 219 } 220 221 /* Keep current WDELAY and RDELAY */ 222 mode |= (readl(owl_host->base + OWL_REG_SD_CTL) & (0xff << 16)); 223 224 /* Start to send corresponding command type */ 225 writel(cmd->arg, owl_host->base + OWL_REG_SD_ARG); 226 writel(cmd->opcode, owl_host->base + OWL_REG_SD_CMD); 227 228 /* Set LBE to send clk at the end of last read block */ 229 if (data) { 230 mode |= (OWL_SD_CTL_TS | OWL_SD_CTL_LBE | 0x64000000); 231 } else { 232 mode &= ~(OWL_SD_CTL_TOUTEN | OWL_SD_CTL_LBE); 233 mode |= OWL_SD_CTL_TS; 234 } 235 236 owl_host->cmd = cmd; 237 238 /* Start transfer */ 239 writel(mode, owl_host->base + OWL_REG_SD_CTL); 240 241 if (data) 242 return; 243 244 timeout = msecs_to_jiffies(cmd->busy_timeout ? cmd->busy_timeout : 245 OWL_CMD_TIMEOUT_MS); 246 247 if (!wait_for_completion_timeout(&owl_host->sdc_complete, timeout)) { 248 dev_err(owl_host->dev, "CMD interrupt timeout\n"); 249 cmd->error = -ETIMEDOUT; 250 return; 251 } 252 253 state = readl(owl_host->base + OWL_REG_SD_STATE); 254 if (mmc_resp_type(cmd) & MMC_RSP_PRESENT) { 255 if (cmd_rsp_mask & state) { 256 if (state & OWL_SD_STATE_CLNR) { 257 dev_err(owl_host->dev, "Error CMD_NO_RSP\n"); 258 cmd->error = -EILSEQ; 259 return; 260 } 261 262 if (state & OWL_SD_STATE_CRC7ER) { 263 dev_err(owl_host->dev, "Error CMD_RSP_CRC\n"); 264 cmd->error = -EILSEQ; 265 return; 266 } 267 } 268 269 if (mmc_resp_type(cmd) & MMC_RSP_136) { 270 cmd->resp[3] = readl(owl_host->base + OWL_REG_SD_RSPBUF0); 271 cmd->resp[2] = readl(owl_host->base + OWL_REG_SD_RSPBUF1); 272 cmd->resp[1] = readl(owl_host->base + OWL_REG_SD_RSPBUF2); 273 cmd->resp[0] = readl(owl_host->base + OWL_REG_SD_RSPBUF3); 274 } else { 275 resp[0] = readl(owl_host->base + OWL_REG_SD_RSPBUF0); 276 resp[1] = readl(owl_host->base + OWL_REG_SD_RSPBUF1); 277 cmd->resp[0] = resp[1] << 24 | resp[0] >> 8; 278 cmd->resp[1] = resp[1] >> 8; 279 } 280 } 281 } 282 283 static void owl_mmc_dma_complete(void *param) 284 { 285 struct owl_mmc_host *owl_host = param; 286 struct mmc_data *data = owl_host->data; 287 288 if (data) 289 complete(&owl_host->dma_complete); 290 } 291 292 static int owl_mmc_prepare_data(struct owl_mmc_host *owl_host, 293 struct mmc_data *data) 294 { 295 u32 total; 296 297 owl_mmc_update_reg(owl_host->base + OWL_REG_SD_EN, OWL_SD_EN_BSEL, 298 true); 299 writel(data->blocks, owl_host->base + OWL_REG_SD_BLK_NUM); 300 writel(data->blksz, owl_host->base + OWL_REG_SD_BLK_SIZE); 301 total = data->blksz * data->blocks; 302 303 if (total < 512) 304 writel(total, owl_host->base + OWL_REG_SD_BUF_SIZE); 305 else 306 writel(512, owl_host->base + OWL_REG_SD_BUF_SIZE); 307 308 if (data->flags & MMC_DATA_WRITE) { 309 owl_host->dma_dir = DMA_TO_DEVICE; 310 owl_host->dma_cfg.direction = DMA_MEM_TO_DEV; 311 } else { 312 owl_host->dma_dir = DMA_FROM_DEVICE; 313 owl_host->dma_cfg.direction = DMA_DEV_TO_MEM; 314 } 315 316 dma_map_sg(owl_host->dma->device->dev, data->sg, 317 data->sg_len, owl_host->dma_dir); 318 319 dmaengine_slave_config(owl_host->dma, &owl_host->dma_cfg); 320 owl_host->desc = dmaengine_prep_slave_sg(owl_host->dma, data->sg, 321 data->sg_len, 322 owl_host->dma_cfg.direction, 323 DMA_PREP_INTERRUPT | 324 DMA_CTRL_ACK); 325 if (!owl_host->desc) { 326 dev_err(owl_host->dev, "Can't prepare slave sg\n"); 327 return -EBUSY; 328 } 329 330 owl_host->data = data; 331 332 owl_host->desc->callback = owl_mmc_dma_complete; 333 owl_host->desc->callback_param = (void *)owl_host; 334 data->error = 0; 335 336 return 0; 337 } 338 339 static void owl_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) 340 { 341 struct owl_mmc_host *owl_host = mmc_priv(mmc); 342 struct mmc_data *data = mrq->data; 343 int ret; 344 345 owl_host->mrq = mrq; 346 if (mrq->data) { 347 ret = owl_mmc_prepare_data(owl_host, data); 348 if (ret < 0) { 349 data->error = ret; 350 goto err_out; 351 } 352 353 init_completion(&owl_host->dma_complete); 354 dmaengine_submit(owl_host->desc); 355 dma_async_issue_pending(owl_host->dma); 356 } 357 358 owl_mmc_send_cmd(owl_host, mrq->cmd, data); 359 360 if (data) { 361 if (!wait_for_completion_timeout(&owl_host->sdc_complete, 362 10 * HZ)) { 363 dev_err(owl_host->dev, "CMD interrupt timeout\n"); 364 mrq->cmd->error = -ETIMEDOUT; 365 dmaengine_terminate_all(owl_host->dma); 366 goto err_out; 367 } 368 369 if (!wait_for_completion_timeout(&owl_host->dma_complete, 370 5 * HZ)) { 371 dev_err(owl_host->dev, "DMA interrupt timeout\n"); 372 mrq->cmd->error = -ETIMEDOUT; 373 dmaengine_terminate_all(owl_host->dma); 374 goto err_out; 375 } 376 377 if (data->stop) 378 owl_mmc_send_cmd(owl_host, data->stop, NULL); 379 380 data->bytes_xfered = data->blocks * data->blksz; 381 } 382 383 err_out: 384 owl_mmc_finish_request(owl_host); 385 } 386 387 static int owl_mmc_set_clk_rate(struct owl_mmc_host *owl_host, 388 unsigned int rate) 389 { 390 unsigned long clk_rate; 391 int ret; 392 u32 reg; 393 394 reg = readl(owl_host->base + OWL_REG_SD_CTL); 395 reg &= ~OWL_SD_CTL_DELAY_MSK; 396 397 /* Set RDELAY and WDELAY based on the clock */ 398 if (rate <= 1000000) { 399 writel(reg | OWL_SD_CTL_RDELAY(OWL_SD_DELAY_LOW_CLK) | 400 OWL_SD_CTL_WDELAY(OWL_SD_DELAY_LOW_CLK), 401 owl_host->base + OWL_REG_SD_CTL); 402 } else if ((rate > 1000000) && (rate <= 26000000)) { 403 writel(reg | OWL_SD_CTL_RDELAY(OWL_SD_DELAY_MID_CLK) | 404 OWL_SD_CTL_WDELAY(OWL_SD_DELAY_MID_CLK), 405 owl_host->base + OWL_REG_SD_CTL); 406 } else if ((rate > 26000000) && (rate <= 52000000) && !owl_host->ddr_50) { 407 writel(reg | OWL_SD_CTL_RDELAY(OWL_SD_DELAY_HIGH_CLK) | 408 OWL_SD_CTL_WDELAY(OWL_SD_DELAY_HIGH_CLK), 409 owl_host->base + OWL_REG_SD_CTL); 410 /* DDR50 mode has special delay chain */ 411 } else if ((rate > 26000000) && (rate <= 52000000) && owl_host->ddr_50) { 412 writel(reg | OWL_SD_CTL_RDELAY(OWL_SD_RDELAY_DDR50) | 413 OWL_SD_CTL_WDELAY(OWL_SD_WDELAY_DDR50), 414 owl_host->base + OWL_REG_SD_CTL); 415 } else { 416 dev_err(owl_host->dev, "SD clock rate not supported\n"); 417 return -EINVAL; 418 } 419 420 clk_rate = clk_round_rate(owl_host->clk, rate << 1); 421 ret = clk_set_rate(owl_host->clk, clk_rate); 422 423 return ret; 424 } 425 426 static void owl_mmc_set_clk(struct owl_mmc_host *owl_host, struct mmc_ios *ios) 427 { 428 if (!ios->clock) 429 return; 430 431 owl_host->clock = ios->clock; 432 owl_mmc_set_clk_rate(owl_host, ios->clock); 433 } 434 435 static void owl_mmc_set_bus_width(struct owl_mmc_host *owl_host, 436 struct mmc_ios *ios) 437 { 438 u32 reg; 439 440 reg = readl(owl_host->base + OWL_REG_SD_EN); 441 reg &= ~0x03; 442 switch (ios->bus_width) { 443 case MMC_BUS_WIDTH_1: 444 break; 445 case MMC_BUS_WIDTH_4: 446 reg |= OWL_SD_EN_DATAWID(1); 447 break; 448 case MMC_BUS_WIDTH_8: 449 reg |= OWL_SD_EN_DATAWID(2); 450 break; 451 } 452 453 writel(reg, owl_host->base + OWL_REG_SD_EN); 454 } 455 456 static void owl_mmc_ctr_reset(struct owl_mmc_host *owl_host) 457 { 458 reset_control_assert(owl_host->reset); 459 udelay(20); 460 reset_control_deassert(owl_host->reset); 461 } 462 463 static void owl_mmc_power_on(struct owl_mmc_host *owl_host) 464 { 465 u32 mode; 466 467 init_completion(&owl_host->sdc_complete); 468 469 /* Enable transfer end IRQ */ 470 owl_mmc_update_reg(owl_host->base + OWL_REG_SD_STATE, 471 OWL_SD_STATE_TEIE, true); 472 473 /* Send init clk */ 474 mode = (readl(owl_host->base + OWL_REG_SD_CTL) & (0xff << 16)); 475 mode |= OWL_SD_CTL_TS | OWL_SD_CTL_TCN(5) | OWL_SD_CTL_TM(8); 476 writel(mode, owl_host->base + OWL_REG_SD_CTL); 477 478 if (!wait_for_completion_timeout(&owl_host->sdc_complete, HZ)) { 479 dev_err(owl_host->dev, "CMD interrupt timeout\n"); 480 return; 481 } 482 } 483 484 static void owl_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 485 { 486 struct owl_mmc_host *owl_host = mmc_priv(mmc); 487 488 switch (ios->power_mode) { 489 case MMC_POWER_UP: 490 dev_dbg(owl_host->dev, "Powering card up\n"); 491 492 /* Reset the SDC controller to clear all previous states */ 493 owl_mmc_ctr_reset(owl_host); 494 clk_prepare_enable(owl_host->clk); 495 writel(OWL_SD_ENABLE | OWL_SD_EN_RESE, 496 owl_host->base + OWL_REG_SD_EN); 497 498 break; 499 500 case MMC_POWER_ON: 501 dev_dbg(owl_host->dev, "Powering card on\n"); 502 owl_mmc_power_on(owl_host); 503 504 break; 505 506 case MMC_POWER_OFF: 507 dev_dbg(owl_host->dev, "Powering card off\n"); 508 clk_disable_unprepare(owl_host->clk); 509 510 return; 511 512 default: 513 dev_dbg(owl_host->dev, "Ignoring unknown card power state\n"); 514 break; 515 } 516 517 if (ios->clock != owl_host->clock) 518 owl_mmc_set_clk(owl_host, ios); 519 520 owl_mmc_set_bus_width(owl_host, ios); 521 522 /* Enable DDR mode if requested */ 523 if (ios->timing == MMC_TIMING_UHS_DDR50) { 524 owl_host->ddr_50 = true; 525 owl_mmc_update_reg(owl_host->base + OWL_REG_SD_EN, 526 OWL_SD_EN_DDREN, true); 527 } else { 528 owl_host->ddr_50 = false; 529 } 530 } 531 532 static int owl_mmc_start_signal_voltage_switch(struct mmc_host *mmc, 533 struct mmc_ios *ios) 534 { 535 struct owl_mmc_host *owl_host = mmc_priv(mmc); 536 537 /* It is enough to change the pad ctrl bit for voltage switch */ 538 switch (ios->signal_voltage) { 539 case MMC_SIGNAL_VOLTAGE_330: 540 owl_mmc_update_reg(owl_host->base + OWL_REG_SD_EN, 541 OWL_SD_EN_S18EN, false); 542 break; 543 case MMC_SIGNAL_VOLTAGE_180: 544 owl_mmc_update_reg(owl_host->base + OWL_REG_SD_EN, 545 OWL_SD_EN_S18EN, true); 546 break; 547 default: 548 return -ENOTSUPP; 549 } 550 551 return 0; 552 } 553 554 static const struct mmc_host_ops owl_mmc_ops = { 555 .request = owl_mmc_request, 556 .set_ios = owl_mmc_set_ios, 557 .get_ro = mmc_gpio_get_ro, 558 .get_cd = mmc_gpio_get_cd, 559 .start_signal_voltage_switch = owl_mmc_start_signal_voltage_switch, 560 }; 561 562 static int owl_mmc_probe(struct platform_device *pdev) 563 { 564 struct owl_mmc_host *owl_host; 565 struct mmc_host *mmc; 566 struct resource *res; 567 int ret; 568 569 mmc = mmc_alloc_host(sizeof(struct owl_mmc_host), &pdev->dev); 570 if (!mmc) { 571 dev_err(&pdev->dev, "mmc alloc host failed\n"); 572 return -ENOMEM; 573 } 574 platform_set_drvdata(pdev, mmc); 575 576 owl_host = mmc_priv(mmc); 577 owl_host->dev = &pdev->dev; 578 owl_host->mmc = mmc; 579 spin_lock_init(&owl_host->lock); 580 581 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 582 owl_host->base = devm_ioremap_resource(&pdev->dev, res); 583 if (IS_ERR(owl_host->base)) { 584 ret = PTR_ERR(owl_host->base); 585 goto err_free_host; 586 } 587 588 owl_host->clk = devm_clk_get(&pdev->dev, NULL); 589 if (IS_ERR(owl_host->clk)) { 590 dev_err(&pdev->dev, "No clock defined\n"); 591 ret = PTR_ERR(owl_host->clk); 592 goto err_free_host; 593 } 594 595 owl_host->reset = devm_reset_control_get_exclusive(&pdev->dev, NULL); 596 if (IS_ERR(owl_host->reset)) { 597 dev_err(&pdev->dev, "Could not get reset control\n"); 598 ret = PTR_ERR(owl_host->reset); 599 goto err_free_host; 600 } 601 602 mmc->ops = &owl_mmc_ops; 603 mmc->max_blk_count = 512; 604 mmc->max_blk_size = 512; 605 mmc->max_segs = 256; 606 mmc->max_seg_size = 262144; 607 mmc->max_req_size = 262144; 608 /* 100kHz ~ 52MHz */ 609 mmc->f_min = 100000; 610 mmc->f_max = 52000000; 611 mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED | 612 MMC_CAP_4_BIT_DATA; 613 mmc->caps2 = (MMC_CAP2_BOOTPART_NOACC | MMC_CAP2_NO_SDIO); 614 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34 | 615 MMC_VDD_165_195; 616 617 ret = mmc_of_parse(mmc); 618 if (ret) 619 goto err_free_host; 620 621 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 622 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; 623 owl_host->dma = dma_request_chan(&pdev->dev, "mmc"); 624 if (IS_ERR(owl_host->dma)) { 625 dev_err(owl_host->dev, "Failed to get external DMA channel.\n"); 626 ret = PTR_ERR(owl_host->dma); 627 goto err_free_host; 628 } 629 630 dev_info(&pdev->dev, "Using %s for DMA transfers\n", 631 dma_chan_name(owl_host->dma)); 632 633 owl_host->dma_cfg.src_addr = res->start + OWL_REG_SD_DAT; 634 owl_host->dma_cfg.dst_addr = res->start + OWL_REG_SD_DAT; 635 owl_host->dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 636 owl_host->dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 637 owl_host->dma_cfg.device_fc = false; 638 639 owl_host->irq = platform_get_irq(pdev, 0); 640 if (owl_host->irq < 0) { 641 ret = -EINVAL; 642 goto err_release_channel; 643 } 644 645 ret = devm_request_irq(&pdev->dev, owl_host->irq, owl_irq_handler, 646 0, dev_name(&pdev->dev), owl_host); 647 if (ret) { 648 dev_err(&pdev->dev, "Failed to request irq %d\n", 649 owl_host->irq); 650 goto err_release_channel; 651 } 652 653 ret = mmc_add_host(mmc); 654 if (ret) { 655 dev_err(&pdev->dev, "Failed to add host\n"); 656 goto err_release_channel; 657 } 658 659 dev_dbg(&pdev->dev, "Owl MMC Controller Initialized\n"); 660 661 return 0; 662 663 err_release_channel: 664 dma_release_channel(owl_host->dma); 665 err_free_host: 666 mmc_free_host(mmc); 667 668 return ret; 669 } 670 671 static int owl_mmc_remove(struct platform_device *pdev) 672 { 673 struct mmc_host *mmc = platform_get_drvdata(pdev); 674 struct owl_mmc_host *owl_host = mmc_priv(mmc); 675 676 mmc_remove_host(mmc); 677 disable_irq(owl_host->irq); 678 dma_release_channel(owl_host->dma); 679 mmc_free_host(mmc); 680 681 return 0; 682 } 683 684 static const struct of_device_id owl_mmc_of_match[] = { 685 {.compatible = "actions,owl-mmc",}, 686 { /* sentinel */ } 687 }; 688 MODULE_DEVICE_TABLE(of, owl_mmc_of_match); 689 690 static struct platform_driver owl_mmc_driver = { 691 .driver = { 692 .name = "owl_mmc", 693 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 694 .of_match_table = owl_mmc_of_match, 695 }, 696 .probe = owl_mmc_probe, 697 .remove = owl_mmc_remove, 698 }; 699 module_platform_driver(owl_mmc_driver); 700 701 MODULE_DESCRIPTION("Actions Semi Owl SoCs SD/MMC Driver"); 702 MODULE_AUTHOR("Actions Semi"); 703 MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>"); 704 MODULE_LICENSE("GPL"); 705