1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * meson-mx-sdio.c - Meson6, Meson8 and Meson8b SDIO/MMC Host Controller 4 * 5 * Copyright (C) 2015 Endless Mobile, Inc. 6 * Author: Carlo Caione <carlo@endlessm.com> 7 * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com> 8 */ 9 10 #include <linux/bitfield.h> 11 #include <linux/clk.h> 12 #include <linux/clk-provider.h> 13 #include <linux/delay.h> 14 #include <linux/device.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/module.h> 17 #include <linux/interrupt.h> 18 #include <linux/io.h> 19 #include <linux/ioport.h> 20 #include <linux/platform_device.h> 21 #include <linux/of_platform.h> 22 #include <linux/timer.h> 23 #include <linux/types.h> 24 25 #include <linux/mmc/host.h> 26 #include <linux/mmc/mmc.h> 27 #include <linux/mmc/sdio.h> 28 #include <linux/mmc/slot-gpio.h> 29 30 #define MESON_MX_SDIO_ARGU 0x00 31 32 #define MESON_MX_SDIO_SEND 0x04 33 #define MESON_MX_SDIO_SEND_COMMAND_INDEX_MASK GENMASK(7, 0) 34 #define MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK GENMASK(15, 8) 35 #define MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7 BIT(16) 36 #define MESON_MX_SDIO_SEND_RESP_HAS_DATA BIT(17) 37 #define MESON_MX_SDIO_SEND_RESP_CRC7_FROM_8 BIT(18) 38 #define MESON_MX_SDIO_SEND_CHECK_DAT0_BUSY BIT(19) 39 #define MESON_MX_SDIO_SEND_DATA BIT(20) 40 #define MESON_MX_SDIO_SEND_USE_INT_WINDOW BIT(21) 41 #define MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK GENMASK(31, 24) 42 43 #define MESON_MX_SDIO_CONF 0x08 44 #define MESON_MX_SDIO_CONF_CMD_CLK_DIV_SHIFT 0 45 #define MESON_MX_SDIO_CONF_CMD_CLK_DIV_WIDTH 10 46 #define MESON_MX_SDIO_CONF_CMD_DISABLE_CRC BIT(10) 47 #define MESON_MX_SDIO_CONF_CMD_OUT_AT_POSITIVE_EDGE BIT(11) 48 #define MESON_MX_SDIO_CONF_CMD_ARGUMENT_BITS_MASK GENMASK(17, 12) 49 #define MESON_MX_SDIO_CONF_RESP_LATCH_AT_NEGATIVE_EDGE BIT(18) 50 #define MESON_MX_SDIO_CONF_DATA_LATCH_AT_NEGATIVE_EDGE BIT(19) 51 #define MESON_MX_SDIO_CONF_BUS_WIDTH BIT(20) 52 #define MESON_MX_SDIO_CONF_M_ENDIAN_MASK GENMASK(22, 21) 53 #define MESON_MX_SDIO_CONF_WRITE_NWR_MASK GENMASK(28, 23) 54 #define MESON_MX_SDIO_CONF_WRITE_CRC_OK_STATUS_MASK GENMASK(31, 29) 55 56 #define MESON_MX_SDIO_IRQS 0x0c 57 #define MESON_MX_SDIO_IRQS_STATUS_STATE_MACHINE_MASK GENMASK(3, 0) 58 #define MESON_MX_SDIO_IRQS_CMD_BUSY BIT(4) 59 #define MESON_MX_SDIO_IRQS_RESP_CRC7_OK BIT(5) 60 #define MESON_MX_SDIO_IRQS_DATA_READ_CRC16_OK BIT(6) 61 #define MESON_MX_SDIO_IRQS_DATA_WRITE_CRC16_OK BIT(7) 62 #define MESON_MX_SDIO_IRQS_IF_INT BIT(8) 63 #define MESON_MX_SDIO_IRQS_CMD_INT BIT(9) 64 #define MESON_MX_SDIO_IRQS_STATUS_INFO_MASK GENMASK(15, 12) 65 #define MESON_MX_SDIO_IRQS_TIMING_OUT_INT BIT(16) 66 #define MESON_MX_SDIO_IRQS_AMRISC_TIMING_OUT_INT_EN BIT(17) 67 #define MESON_MX_SDIO_IRQS_ARC_TIMING_OUT_INT_EN BIT(18) 68 #define MESON_MX_SDIO_IRQS_TIMING_OUT_COUNT_MASK GENMASK(31, 19) 69 70 #define MESON_MX_SDIO_IRQC 0x10 71 #define MESON_MX_SDIO_IRQC_ARC_IF_INT_EN BIT(3) 72 #define MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN BIT(4) 73 #define MESON_MX_SDIO_IRQC_IF_CONFIG_MASK GENMASK(7, 6) 74 #define MESON_MX_SDIO_IRQC_FORCE_DATA_CLK BIT(8) 75 #define MESON_MX_SDIO_IRQC_FORCE_DATA_CMD BIT(9) 76 #define MESON_MX_SDIO_IRQC_FORCE_DATA_DAT_MASK GENMASK(13, 10) 77 #define MESON_MX_SDIO_IRQC_SOFT_RESET BIT(15) 78 #define MESON_MX_SDIO_IRQC_FORCE_HALT BIT(30) 79 #define MESON_MX_SDIO_IRQC_HALT_HOLE BIT(31) 80 81 #define MESON_MX_SDIO_MULT 0x14 82 #define MESON_MX_SDIO_MULT_PORT_SEL_MASK GENMASK(1, 0) 83 #define MESON_MX_SDIO_MULT_MEMORY_STICK_ENABLE BIT(2) 84 #define MESON_MX_SDIO_MULT_MEMORY_STICK_SCLK_ALWAYS BIT(3) 85 #define MESON_MX_SDIO_MULT_STREAM_ENABLE BIT(4) 86 #define MESON_MX_SDIO_MULT_STREAM_8BITS_MODE BIT(5) 87 #define MESON_MX_SDIO_MULT_WR_RD_OUT_INDEX BIT(8) 88 #define MESON_MX_SDIO_MULT_DAT0_DAT1_SWAPPED BIT(10) 89 #define MESON_MX_SDIO_MULT_DAT1_DAT0_SWAPPED BIT(11) 90 #define MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK GENMASK(15, 12) 91 92 #define MESON_MX_SDIO_ADDR 0x18 93 94 #define MESON_MX_SDIO_EXT 0x1c 95 #define MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK GENMASK(29, 16) 96 97 #define MESON_MX_SDIO_BOUNCE_REQ_SIZE (128 * 1024) 98 #define MESON_MX_SDIO_RESPONSE_CRC16_BITS (16 - 1) 99 #define MESON_MX_SDIO_MAX_SLOTS 3 100 101 struct meson_mx_mmc_host { 102 struct device *controller_dev; 103 104 struct clk *parent_clk; 105 struct clk *core_clk; 106 struct clk_divider cfg_div; 107 struct clk *cfg_div_clk; 108 struct clk_fixed_factor fixed_factor; 109 struct clk *fixed_factor_clk; 110 111 void __iomem *base; 112 int irq; 113 spinlock_t irq_lock; 114 115 struct timer_list cmd_timeout; 116 117 unsigned int slot_id; 118 struct mmc_host *mmc; 119 120 struct mmc_request *mrq; 121 struct mmc_command *cmd; 122 int error; 123 }; 124 125 static void meson_mx_mmc_mask_bits(struct mmc_host *mmc, char reg, u32 mask, 126 u32 val) 127 { 128 struct meson_mx_mmc_host *host = mmc_priv(mmc); 129 u32 regval; 130 131 regval = readl(host->base + reg); 132 regval &= ~mask; 133 regval |= (val & mask); 134 135 writel(regval, host->base + reg); 136 } 137 138 static void meson_mx_mmc_soft_reset(struct meson_mx_mmc_host *host) 139 { 140 writel(MESON_MX_SDIO_IRQC_SOFT_RESET, host->base + MESON_MX_SDIO_IRQC); 141 udelay(2); 142 } 143 144 static struct mmc_command *meson_mx_mmc_get_next_cmd(struct mmc_command *cmd) 145 { 146 if (cmd->opcode == MMC_SET_BLOCK_COUNT && !cmd->error) 147 return cmd->mrq->cmd; 148 else if (mmc_op_multi(cmd->opcode) && 149 (!cmd->mrq->sbc || cmd->error || cmd->data->error)) 150 return cmd->mrq->stop; 151 else 152 return NULL; 153 } 154 155 static void meson_mx_mmc_start_cmd(struct mmc_host *mmc, 156 struct mmc_command *cmd) 157 { 158 struct meson_mx_mmc_host *host = mmc_priv(mmc); 159 unsigned int pack_size; 160 unsigned long irqflags, timeout; 161 u32 mult, send = 0, ext = 0; 162 163 host->cmd = cmd; 164 165 if (cmd->busy_timeout) 166 timeout = msecs_to_jiffies(cmd->busy_timeout); 167 else 168 timeout = msecs_to_jiffies(1000); 169 170 switch (mmc_resp_type(cmd)) { 171 case MMC_RSP_R1: 172 case MMC_RSP_R1B: 173 case MMC_RSP_R3: 174 /* 7 (CMD) + 32 (response) + 7 (CRC) -1 */ 175 send |= FIELD_PREP(MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK, 45); 176 break; 177 case MMC_RSP_R2: 178 /* 7 (CMD) + 120 (response) + 7 (CRC) -1 */ 179 send |= FIELD_PREP(MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK, 133); 180 send |= MESON_MX_SDIO_SEND_RESP_CRC7_FROM_8; 181 break; 182 default: 183 break; 184 } 185 186 if (!(cmd->flags & MMC_RSP_CRC)) 187 send |= MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7; 188 189 if (cmd->flags & MMC_RSP_BUSY) 190 send |= MESON_MX_SDIO_SEND_CHECK_DAT0_BUSY; 191 192 if (cmd->data) { 193 send |= FIELD_PREP(MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK, 194 (cmd->data->blocks - 1)); 195 196 pack_size = cmd->data->blksz * BITS_PER_BYTE; 197 if (mmc->ios.bus_width == MMC_BUS_WIDTH_4) 198 pack_size += MESON_MX_SDIO_RESPONSE_CRC16_BITS * 4; 199 else 200 pack_size += MESON_MX_SDIO_RESPONSE_CRC16_BITS * 1; 201 202 ext |= FIELD_PREP(MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK, 203 pack_size); 204 205 if (cmd->data->flags & MMC_DATA_WRITE) 206 send |= MESON_MX_SDIO_SEND_DATA; 207 else 208 send |= MESON_MX_SDIO_SEND_RESP_HAS_DATA; 209 210 cmd->data->bytes_xfered = 0; 211 } 212 213 send |= FIELD_PREP(MESON_MX_SDIO_SEND_COMMAND_INDEX_MASK, 214 (0x40 | cmd->opcode)); 215 216 spin_lock_irqsave(&host->irq_lock, irqflags); 217 218 mult = readl(host->base + MESON_MX_SDIO_MULT); 219 mult &= ~MESON_MX_SDIO_MULT_PORT_SEL_MASK; 220 mult |= FIELD_PREP(MESON_MX_SDIO_MULT_PORT_SEL_MASK, host->slot_id); 221 mult |= BIT(31); 222 writel(mult, host->base + MESON_MX_SDIO_MULT); 223 224 /* enable the CMD done interrupt */ 225 meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_IRQC, 226 MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN, 227 MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN); 228 229 /* clear pending interrupts */ 230 meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_IRQS, 231 MESON_MX_SDIO_IRQS_CMD_INT, 232 MESON_MX_SDIO_IRQS_CMD_INT); 233 234 writel(cmd->arg, host->base + MESON_MX_SDIO_ARGU); 235 writel(ext, host->base + MESON_MX_SDIO_EXT); 236 writel(send, host->base + MESON_MX_SDIO_SEND); 237 238 spin_unlock_irqrestore(&host->irq_lock, irqflags); 239 240 mod_timer(&host->cmd_timeout, jiffies + timeout); 241 } 242 243 static void meson_mx_mmc_request_done(struct meson_mx_mmc_host *host) 244 { 245 struct mmc_request *mrq; 246 247 mrq = host->mrq; 248 249 if (host->cmd->error) 250 meson_mx_mmc_soft_reset(host); 251 252 host->mrq = NULL; 253 host->cmd = NULL; 254 255 mmc_request_done(host->mmc, mrq); 256 } 257 258 static void meson_mx_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 259 { 260 struct meson_mx_mmc_host *host = mmc_priv(mmc); 261 unsigned short vdd = ios->vdd; 262 unsigned long clk_rate = ios->clock; 263 264 switch (ios->bus_width) { 265 case MMC_BUS_WIDTH_1: 266 meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_CONF, 267 MESON_MX_SDIO_CONF_BUS_WIDTH, 0); 268 break; 269 270 case MMC_BUS_WIDTH_4: 271 meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_CONF, 272 MESON_MX_SDIO_CONF_BUS_WIDTH, 273 MESON_MX_SDIO_CONF_BUS_WIDTH); 274 break; 275 276 case MMC_BUS_WIDTH_8: 277 default: 278 dev_err(mmc_dev(mmc), "unsupported bus width: %d\n", 279 ios->bus_width); 280 host->error = -EINVAL; 281 return; 282 } 283 284 host->error = clk_set_rate(host->cfg_div_clk, ios->clock); 285 if (host->error) { 286 dev_warn(mmc_dev(mmc), 287 "failed to set MMC clock to %lu: %d\n", 288 clk_rate, host->error); 289 return; 290 } 291 292 mmc->actual_clock = clk_get_rate(host->cfg_div_clk); 293 294 switch (ios->power_mode) { 295 case MMC_POWER_OFF: 296 vdd = 0; 297 fallthrough; 298 case MMC_POWER_UP: 299 if (!IS_ERR(mmc->supply.vmmc)) { 300 host->error = mmc_regulator_set_ocr(mmc, 301 mmc->supply.vmmc, 302 vdd); 303 if (host->error) 304 return; 305 } 306 break; 307 } 308 } 309 310 static int meson_mx_mmc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq) 311 { 312 struct mmc_data *data = mrq->data; 313 int dma_len; 314 struct scatterlist *sg; 315 316 if (!data) 317 return 0; 318 319 sg = data->sg; 320 if (sg->offset & 3 || sg->length & 3) { 321 dev_err(mmc_dev(mmc), 322 "unaligned scatterlist: offset %x length %d\n", 323 sg->offset, sg->length); 324 return -EINVAL; 325 } 326 327 dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len, 328 mmc_get_dma_dir(data)); 329 if (dma_len <= 0) { 330 dev_err(mmc_dev(mmc), "dma_map_sg failed\n"); 331 return -ENOMEM; 332 } 333 334 return 0; 335 } 336 337 static void meson_mx_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) 338 { 339 struct meson_mx_mmc_host *host = mmc_priv(mmc); 340 struct mmc_command *cmd = mrq->cmd; 341 342 if (!host->error) 343 host->error = meson_mx_mmc_map_dma(mmc, mrq); 344 345 if (host->error) { 346 cmd->error = host->error; 347 mmc_request_done(mmc, mrq); 348 return; 349 } 350 351 host->mrq = mrq; 352 353 if (mrq->data) 354 writel(sg_dma_address(mrq->data->sg), 355 host->base + MESON_MX_SDIO_ADDR); 356 357 if (mrq->sbc) 358 meson_mx_mmc_start_cmd(mmc, mrq->sbc); 359 else 360 meson_mx_mmc_start_cmd(mmc, mrq->cmd); 361 } 362 363 static void meson_mx_mmc_read_response(struct mmc_host *mmc, 364 struct mmc_command *cmd) 365 { 366 struct meson_mx_mmc_host *host = mmc_priv(mmc); 367 u32 mult; 368 int i, resp[4]; 369 370 mult = readl(host->base + MESON_MX_SDIO_MULT); 371 mult |= MESON_MX_SDIO_MULT_WR_RD_OUT_INDEX; 372 mult &= ~MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK; 373 mult |= FIELD_PREP(MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK, 0); 374 writel(mult, host->base + MESON_MX_SDIO_MULT); 375 376 if (cmd->flags & MMC_RSP_136) { 377 for (i = 0; i <= 3; i++) 378 resp[3 - i] = readl(host->base + MESON_MX_SDIO_ARGU); 379 cmd->resp[0] = (resp[0] << 8) | ((resp[1] >> 24) & 0xff); 380 cmd->resp[1] = (resp[1] << 8) | ((resp[2] >> 24) & 0xff); 381 cmd->resp[2] = (resp[2] << 8) | ((resp[3] >> 24) & 0xff); 382 cmd->resp[3] = (resp[3] << 8); 383 } else if (cmd->flags & MMC_RSP_PRESENT) { 384 cmd->resp[0] = readl(host->base + MESON_MX_SDIO_ARGU); 385 } 386 } 387 388 static irqreturn_t meson_mx_mmc_process_cmd_irq(struct meson_mx_mmc_host *host, 389 u32 irqs, u32 send) 390 { 391 struct mmc_command *cmd = host->cmd; 392 393 /* 394 * NOTE: even though it shouldn't happen we sometimes get command 395 * interrupts twice (at least this is what it looks like). Ideally 396 * we find out why this happens and warn here as soon as it occurs. 397 */ 398 if (!cmd) 399 return IRQ_HANDLED; 400 401 cmd->error = 0; 402 meson_mx_mmc_read_response(host->mmc, cmd); 403 404 if (cmd->data) { 405 if (!((irqs & MESON_MX_SDIO_IRQS_DATA_READ_CRC16_OK) || 406 (irqs & MESON_MX_SDIO_IRQS_DATA_WRITE_CRC16_OK))) 407 cmd->error = -EILSEQ; 408 } else { 409 if (!((irqs & MESON_MX_SDIO_IRQS_RESP_CRC7_OK) || 410 (send & MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7))) 411 cmd->error = -EILSEQ; 412 } 413 414 return IRQ_WAKE_THREAD; 415 } 416 417 static irqreturn_t meson_mx_mmc_irq(int irq, void *data) 418 { 419 struct meson_mx_mmc_host *host = (void *) data; 420 u32 irqs, send; 421 irqreturn_t ret; 422 423 spin_lock(&host->irq_lock); 424 425 irqs = readl(host->base + MESON_MX_SDIO_IRQS); 426 send = readl(host->base + MESON_MX_SDIO_SEND); 427 428 if (irqs & MESON_MX_SDIO_IRQS_CMD_INT) 429 ret = meson_mx_mmc_process_cmd_irq(host, irqs, send); 430 else 431 ret = IRQ_HANDLED; 432 433 /* finally ACK all pending interrupts */ 434 writel(irqs, host->base + MESON_MX_SDIO_IRQS); 435 436 spin_unlock(&host->irq_lock); 437 438 return ret; 439 } 440 441 static irqreturn_t meson_mx_mmc_irq_thread(int irq, void *irq_data) 442 { 443 struct meson_mx_mmc_host *host = (void *) irq_data; 444 struct mmc_command *cmd = host->cmd, *next_cmd; 445 446 if (WARN_ON(!cmd)) 447 return IRQ_HANDLED; 448 449 del_timer_sync(&host->cmd_timeout); 450 451 if (cmd->data) { 452 dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg, 453 cmd->data->sg_len, 454 mmc_get_dma_dir(cmd->data)); 455 456 cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks; 457 } 458 459 next_cmd = meson_mx_mmc_get_next_cmd(cmd); 460 if (next_cmd) 461 meson_mx_mmc_start_cmd(host->mmc, next_cmd); 462 else 463 meson_mx_mmc_request_done(host); 464 465 return IRQ_HANDLED; 466 } 467 468 static void meson_mx_mmc_timeout(struct timer_list *t) 469 { 470 struct meson_mx_mmc_host *host = from_timer(host, t, cmd_timeout); 471 unsigned long irqflags; 472 u32 irqc; 473 474 spin_lock_irqsave(&host->irq_lock, irqflags); 475 476 /* disable the CMD interrupt */ 477 irqc = readl(host->base + MESON_MX_SDIO_IRQC); 478 irqc &= ~MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN; 479 writel(irqc, host->base + MESON_MX_SDIO_IRQC); 480 481 spin_unlock_irqrestore(&host->irq_lock, irqflags); 482 483 /* 484 * skip the timeout handling if the interrupt handler already processed 485 * the command. 486 */ 487 if (!host->cmd) 488 return; 489 490 dev_dbg(mmc_dev(host->mmc), 491 "Timeout on CMD%u (IRQS = 0x%08x, ARGU = 0x%08x)\n", 492 host->cmd->opcode, readl(host->base + MESON_MX_SDIO_IRQS), 493 readl(host->base + MESON_MX_SDIO_ARGU)); 494 495 host->cmd->error = -ETIMEDOUT; 496 497 meson_mx_mmc_request_done(host); 498 } 499 500 static struct mmc_host_ops meson_mx_mmc_ops = { 501 .request = meson_mx_mmc_request, 502 .set_ios = meson_mx_mmc_set_ios, 503 .get_cd = mmc_gpio_get_cd, 504 .get_ro = mmc_gpio_get_ro, 505 }; 506 507 static struct platform_device *meson_mx_mmc_slot_pdev(struct device *parent) 508 { 509 struct device_node *slot_node; 510 struct platform_device *pdev; 511 512 /* 513 * TODO: the MMC core framework currently does not support 514 * controllers with multiple slots properly. So we only register 515 * the first slot for now 516 */ 517 slot_node = of_get_compatible_child(parent->of_node, "mmc-slot"); 518 if (!slot_node) { 519 dev_warn(parent, "no 'mmc-slot' sub-node found\n"); 520 return ERR_PTR(-ENOENT); 521 } 522 523 pdev = of_platform_device_create(slot_node, NULL, parent); 524 of_node_put(slot_node); 525 526 return pdev; 527 } 528 529 static int meson_mx_mmc_add_host(struct meson_mx_mmc_host *host) 530 { 531 struct mmc_host *mmc = host->mmc; 532 struct device *slot_dev = mmc_dev(mmc); 533 int ret; 534 535 if (of_property_read_u32(slot_dev->of_node, "reg", &host->slot_id)) { 536 dev_err(slot_dev, "missing 'reg' property\n"); 537 return -EINVAL; 538 } 539 540 if (host->slot_id >= MESON_MX_SDIO_MAX_SLOTS) { 541 dev_err(slot_dev, "invalid 'reg' property value %d\n", 542 host->slot_id); 543 return -EINVAL; 544 } 545 546 /* Get regulators and the supported OCR mask */ 547 ret = mmc_regulator_get_supply(mmc); 548 if (ret) 549 return ret; 550 551 mmc->max_req_size = MESON_MX_SDIO_BOUNCE_REQ_SIZE; 552 mmc->max_seg_size = mmc->max_req_size; 553 mmc->max_blk_count = 554 FIELD_GET(MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK, 555 0xffffffff); 556 mmc->max_blk_size = FIELD_GET(MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK, 557 0xffffffff); 558 mmc->max_blk_size -= (4 * MESON_MX_SDIO_RESPONSE_CRC16_BITS); 559 mmc->max_blk_size /= BITS_PER_BYTE; 560 561 /* Get the min and max supported clock rates */ 562 mmc->f_min = clk_round_rate(host->cfg_div_clk, 1); 563 mmc->f_max = clk_round_rate(host->cfg_div_clk, 564 clk_get_rate(host->parent_clk)); 565 566 mmc->caps |= MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY; 567 mmc->ops = &meson_mx_mmc_ops; 568 569 ret = mmc_of_parse(mmc); 570 if (ret) 571 return ret; 572 573 ret = mmc_add_host(mmc); 574 if (ret) 575 return ret; 576 577 return 0; 578 } 579 580 static int meson_mx_mmc_register_clks(struct meson_mx_mmc_host *host) 581 { 582 struct clk_init_data init; 583 const char *clk_div_parent, *clk_fixed_factor_parent; 584 585 clk_fixed_factor_parent = __clk_get_name(host->parent_clk); 586 init.name = devm_kasprintf(host->controller_dev, GFP_KERNEL, 587 "%s#fixed_factor", 588 dev_name(host->controller_dev)); 589 if (!init.name) 590 return -ENOMEM; 591 592 init.ops = &clk_fixed_factor_ops; 593 init.flags = 0; 594 init.parent_names = &clk_fixed_factor_parent; 595 init.num_parents = 1; 596 host->fixed_factor.div = 2; 597 host->fixed_factor.mult = 1; 598 host->fixed_factor.hw.init = &init; 599 600 host->fixed_factor_clk = devm_clk_register(host->controller_dev, 601 &host->fixed_factor.hw); 602 if (WARN_ON(IS_ERR(host->fixed_factor_clk))) 603 return PTR_ERR(host->fixed_factor_clk); 604 605 clk_div_parent = __clk_get_name(host->fixed_factor_clk); 606 init.name = devm_kasprintf(host->controller_dev, GFP_KERNEL, 607 "%s#div", dev_name(host->controller_dev)); 608 if (!init.name) 609 return -ENOMEM; 610 611 init.ops = &clk_divider_ops; 612 init.flags = CLK_SET_RATE_PARENT; 613 init.parent_names = &clk_div_parent; 614 init.num_parents = 1; 615 host->cfg_div.reg = host->base + MESON_MX_SDIO_CONF; 616 host->cfg_div.shift = MESON_MX_SDIO_CONF_CMD_CLK_DIV_SHIFT; 617 host->cfg_div.width = MESON_MX_SDIO_CONF_CMD_CLK_DIV_WIDTH; 618 host->cfg_div.hw.init = &init; 619 host->cfg_div.flags = CLK_DIVIDER_ALLOW_ZERO; 620 621 host->cfg_div_clk = devm_clk_register(host->controller_dev, 622 &host->cfg_div.hw); 623 if (WARN_ON(IS_ERR(host->cfg_div_clk))) 624 return PTR_ERR(host->cfg_div_clk); 625 626 return 0; 627 } 628 629 static int meson_mx_mmc_probe(struct platform_device *pdev) 630 { 631 struct platform_device *slot_pdev; 632 struct mmc_host *mmc; 633 struct meson_mx_mmc_host *host; 634 int ret, irq; 635 u32 conf; 636 637 slot_pdev = meson_mx_mmc_slot_pdev(&pdev->dev); 638 if (!slot_pdev) 639 return -ENODEV; 640 else if (IS_ERR(slot_pdev)) 641 return PTR_ERR(slot_pdev); 642 643 mmc = mmc_alloc_host(sizeof(*host), &slot_pdev->dev); 644 if (!mmc) { 645 ret = -ENOMEM; 646 goto error_unregister_slot_pdev; 647 } 648 649 host = mmc_priv(mmc); 650 host->mmc = mmc; 651 host->controller_dev = &pdev->dev; 652 653 spin_lock_init(&host->irq_lock); 654 timer_setup(&host->cmd_timeout, meson_mx_mmc_timeout, 0); 655 656 platform_set_drvdata(pdev, host); 657 658 host->base = devm_platform_ioremap_resource(pdev, 0); 659 if (IS_ERR(host->base)) { 660 ret = PTR_ERR(host->base); 661 goto error_free_mmc; 662 } 663 664 irq = platform_get_irq(pdev, 0); 665 ret = devm_request_threaded_irq(host->controller_dev, irq, 666 meson_mx_mmc_irq, 667 meson_mx_mmc_irq_thread, IRQF_ONESHOT, 668 NULL, host); 669 if (ret) 670 goto error_free_mmc; 671 672 host->core_clk = devm_clk_get(host->controller_dev, "core"); 673 if (IS_ERR(host->core_clk)) { 674 ret = PTR_ERR(host->core_clk); 675 goto error_free_mmc; 676 } 677 678 host->parent_clk = devm_clk_get(host->controller_dev, "clkin"); 679 if (IS_ERR(host->parent_clk)) { 680 ret = PTR_ERR(host->parent_clk); 681 goto error_free_mmc; 682 } 683 684 ret = meson_mx_mmc_register_clks(host); 685 if (ret) 686 goto error_free_mmc; 687 688 ret = clk_prepare_enable(host->core_clk); 689 if (ret) { 690 dev_err(host->controller_dev, "Failed to enable core clock\n"); 691 goto error_free_mmc; 692 } 693 694 ret = clk_prepare_enable(host->cfg_div_clk); 695 if (ret) { 696 dev_err(host->controller_dev, "Failed to enable MMC clock\n"); 697 goto error_disable_core_clk; 698 } 699 700 conf = 0; 701 conf |= FIELD_PREP(MESON_MX_SDIO_CONF_CMD_ARGUMENT_BITS_MASK, 39); 702 conf |= FIELD_PREP(MESON_MX_SDIO_CONF_M_ENDIAN_MASK, 0x3); 703 conf |= FIELD_PREP(MESON_MX_SDIO_CONF_WRITE_NWR_MASK, 0x2); 704 conf |= FIELD_PREP(MESON_MX_SDIO_CONF_WRITE_CRC_OK_STATUS_MASK, 0x2); 705 writel(conf, host->base + MESON_MX_SDIO_CONF); 706 707 meson_mx_mmc_soft_reset(host); 708 709 ret = meson_mx_mmc_add_host(host); 710 if (ret) 711 goto error_disable_clks; 712 713 return 0; 714 715 error_disable_clks: 716 clk_disable_unprepare(host->cfg_div_clk); 717 error_disable_core_clk: 718 clk_disable_unprepare(host->core_clk); 719 error_free_mmc: 720 mmc_free_host(mmc); 721 error_unregister_slot_pdev: 722 of_platform_device_destroy(&slot_pdev->dev, NULL); 723 return ret; 724 } 725 726 static int meson_mx_mmc_remove(struct platform_device *pdev) 727 { 728 struct meson_mx_mmc_host *host = platform_get_drvdata(pdev); 729 struct device *slot_dev = mmc_dev(host->mmc); 730 731 del_timer_sync(&host->cmd_timeout); 732 733 mmc_remove_host(host->mmc); 734 735 of_platform_device_destroy(slot_dev, NULL); 736 737 clk_disable_unprepare(host->cfg_div_clk); 738 clk_disable_unprepare(host->core_clk); 739 740 mmc_free_host(host->mmc); 741 742 return 0; 743 } 744 745 static const struct of_device_id meson_mx_mmc_of_match[] = { 746 { .compatible = "amlogic,meson8-sdio", }, 747 { .compatible = "amlogic,meson8b-sdio", }, 748 { /* sentinel */ } 749 }; 750 MODULE_DEVICE_TABLE(of, meson_mx_mmc_of_match); 751 752 static struct platform_driver meson_mx_mmc_driver = { 753 .probe = meson_mx_mmc_probe, 754 .remove = meson_mx_mmc_remove, 755 .driver = { 756 .name = "meson-mx-sdio", 757 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 758 .of_match_table = of_match_ptr(meson_mx_mmc_of_match), 759 }, 760 }; 761 762 module_platform_driver(meson_mx_mmc_driver); 763 764 MODULE_DESCRIPTION("Meson6, Meson8 and Meson8b SDIO/MMC Host Driver"); 765 MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>"); 766 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); 767 MODULE_LICENSE("GPL v2"); 768