1 /* 2 * Amlogic SD/eMMC driver for the GX/S905 family SoCs 3 * 4 * Copyright (c) 2016 BayLibre, SAS. 5 * Author: Kevin Hilman <khilman@baylibre.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of version 2 of the GNU General Public License as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses/>. 18 * The full GNU General Public License is included in this distribution 19 * in the file called COPYING. 20 */ 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/init.h> 24 #include <linux/device.h> 25 #include <linux/of_device.h> 26 #include <linux/platform_device.h> 27 #include <linux/ioport.h> 28 #include <linux/spinlock.h> 29 #include <linux/dma-mapping.h> 30 #include <linux/mmc/host.h> 31 #include <linux/mmc/mmc.h> 32 #include <linux/mmc/sdio.h> 33 #include <linux/mmc/slot-gpio.h> 34 #include <linux/io.h> 35 #include <linux/clk.h> 36 #include <linux/clk-provider.h> 37 #include <linux/regulator/consumer.h> 38 #include <linux/interrupt.h> 39 #include <linux/bitfield.h> 40 #include <linux/pinctrl/consumer.h> 41 42 #define DRIVER_NAME "meson-gx-mmc" 43 44 #define SD_EMMC_CLOCK 0x0 45 #define CLK_DIV_MASK GENMASK(5, 0) 46 #define CLK_SRC_MASK GENMASK(7, 6) 47 #define CLK_CORE_PHASE_MASK GENMASK(9, 8) 48 #define CLK_TX_PHASE_MASK GENMASK(11, 10) 49 #define CLK_RX_PHASE_MASK GENMASK(13, 12) 50 #define CLK_TX_DELAY_MASK GENMASK(19, 16) 51 #define CLK_RX_DELAY_MASK GENMASK(23, 20) 52 #define CLK_DELAY_STEP_PS 200 53 #define CLK_PHASE_STEP 30 54 #define CLK_PHASE_POINT_NUM (360 / CLK_PHASE_STEP) 55 #define CLK_ALWAYS_ON BIT(24) 56 57 #define SD_EMMC_DELAY 0x4 58 #define SD_EMMC_ADJUST 0x8 59 #define SD_EMMC_CALOUT 0x10 60 #define SD_EMMC_START 0x40 61 #define START_DESC_INIT BIT(0) 62 #define START_DESC_BUSY BIT(1) 63 #define START_DESC_ADDR_MASK GENMASK(31, 2) 64 65 #define SD_EMMC_CFG 0x44 66 #define CFG_BUS_WIDTH_MASK GENMASK(1, 0) 67 #define CFG_BUS_WIDTH_1 0x0 68 #define CFG_BUS_WIDTH_4 0x1 69 #define CFG_BUS_WIDTH_8 0x2 70 #define CFG_DDR BIT(2) 71 #define CFG_BLK_LEN_MASK GENMASK(7, 4) 72 #define CFG_RESP_TIMEOUT_MASK GENMASK(11, 8) 73 #define CFG_RC_CC_MASK GENMASK(15, 12) 74 #define CFG_STOP_CLOCK BIT(22) 75 #define CFG_CLK_ALWAYS_ON BIT(18) 76 #define CFG_CHK_DS BIT(20) 77 #define CFG_AUTO_CLK BIT(23) 78 79 #define SD_EMMC_STATUS 0x48 80 #define STATUS_BUSY BIT(31) 81 #define STATUS_DATI GENMASK(23, 16) 82 83 #define SD_EMMC_IRQ_EN 0x4c 84 #define IRQ_RXD_ERR_MASK GENMASK(7, 0) 85 #define IRQ_TXD_ERR BIT(8) 86 #define IRQ_DESC_ERR BIT(9) 87 #define IRQ_RESP_ERR BIT(10) 88 #define IRQ_CRC_ERR \ 89 (IRQ_RXD_ERR_MASK | IRQ_TXD_ERR | IRQ_DESC_ERR | IRQ_RESP_ERR) 90 #define IRQ_RESP_TIMEOUT BIT(11) 91 #define IRQ_DESC_TIMEOUT BIT(12) 92 #define IRQ_TIMEOUTS \ 93 (IRQ_RESP_TIMEOUT | IRQ_DESC_TIMEOUT) 94 #define IRQ_END_OF_CHAIN BIT(13) 95 #define IRQ_RESP_STATUS BIT(14) 96 #define IRQ_SDIO BIT(15) 97 #define IRQ_EN_MASK \ 98 (IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN | IRQ_RESP_STATUS |\ 99 IRQ_SDIO) 100 101 #define SD_EMMC_CMD_CFG 0x50 102 #define SD_EMMC_CMD_ARG 0x54 103 #define SD_EMMC_CMD_DAT 0x58 104 #define SD_EMMC_CMD_RSP 0x5c 105 #define SD_EMMC_CMD_RSP1 0x60 106 #define SD_EMMC_CMD_RSP2 0x64 107 #define SD_EMMC_CMD_RSP3 0x68 108 109 #define SD_EMMC_RXD 0x94 110 #define SD_EMMC_TXD 0x94 111 #define SD_EMMC_LAST_REG SD_EMMC_TXD 112 113 #define SD_EMMC_CFG_BLK_SIZE 512 /* internal buffer max: 512 bytes */ 114 #define SD_EMMC_CFG_RESP_TIMEOUT 256 /* in clock cycles */ 115 #define SD_EMMC_CMD_TIMEOUT 1024 /* in ms */ 116 #define SD_EMMC_CMD_TIMEOUT_DATA 4096 /* in ms */ 117 #define SD_EMMC_CFG_CMD_GAP 16 /* in clock cycles */ 118 #define SD_EMMC_DESC_BUF_LEN PAGE_SIZE 119 120 #define SD_EMMC_PRE_REQ_DONE BIT(0) 121 #define SD_EMMC_DESC_CHAIN_MODE BIT(1) 122 123 #define MUX_CLK_NUM_PARENTS 2 124 125 struct sd_emmc_desc { 126 u32 cmd_cfg; 127 u32 cmd_arg; 128 u32 cmd_data; 129 u32 cmd_resp; 130 }; 131 132 struct meson_host { 133 struct device *dev; 134 struct mmc_host *mmc; 135 struct mmc_command *cmd; 136 137 spinlock_t lock; 138 void __iomem *regs; 139 struct clk *core_clk; 140 struct clk *mmc_clk; 141 struct clk *rx_clk; 142 struct clk *tx_clk; 143 unsigned long req_rate; 144 145 struct pinctrl *pinctrl; 146 struct pinctrl_state *pins_default; 147 struct pinctrl_state *pins_clk_gate; 148 149 unsigned int bounce_buf_size; 150 void *bounce_buf; 151 dma_addr_t bounce_dma_addr; 152 struct sd_emmc_desc *descs; 153 dma_addr_t descs_dma_addr; 154 155 bool vqmmc_enabled; 156 }; 157 158 #define CMD_CFG_LENGTH_MASK GENMASK(8, 0) 159 #define CMD_CFG_BLOCK_MODE BIT(9) 160 #define CMD_CFG_R1B BIT(10) 161 #define CMD_CFG_END_OF_CHAIN BIT(11) 162 #define CMD_CFG_TIMEOUT_MASK GENMASK(15, 12) 163 #define CMD_CFG_NO_RESP BIT(16) 164 #define CMD_CFG_NO_CMD BIT(17) 165 #define CMD_CFG_DATA_IO BIT(18) 166 #define CMD_CFG_DATA_WR BIT(19) 167 #define CMD_CFG_RESP_NOCRC BIT(20) 168 #define CMD_CFG_RESP_128 BIT(21) 169 #define CMD_CFG_RESP_NUM BIT(22) 170 #define CMD_CFG_DATA_NUM BIT(23) 171 #define CMD_CFG_CMD_INDEX_MASK GENMASK(29, 24) 172 #define CMD_CFG_ERROR BIT(30) 173 #define CMD_CFG_OWNER BIT(31) 174 175 #define CMD_DATA_MASK GENMASK(31, 2) 176 #define CMD_DATA_BIG_ENDIAN BIT(1) 177 #define CMD_DATA_SRAM BIT(0) 178 #define CMD_RESP_MASK GENMASK(31, 1) 179 #define CMD_RESP_SRAM BIT(0) 180 181 struct meson_mmc_phase { 182 struct clk_hw hw; 183 void __iomem *reg; 184 unsigned long phase_mask; 185 unsigned long delay_mask; 186 unsigned int delay_step_ps; 187 }; 188 189 #define to_meson_mmc_phase(_hw) container_of(_hw, struct meson_mmc_phase, hw) 190 191 static int meson_mmc_clk_get_phase(struct clk_hw *hw) 192 { 193 struct meson_mmc_phase *mmc = to_meson_mmc_phase(hw); 194 unsigned int phase_num = 1 << hweight_long(mmc->phase_mask); 195 unsigned long period_ps, p, d; 196 int degrees; 197 u32 val; 198 199 val = readl(mmc->reg); 200 p = (val & mmc->phase_mask) >> __ffs(mmc->phase_mask); 201 degrees = p * 360 / phase_num; 202 203 if (mmc->delay_mask) { 204 period_ps = DIV_ROUND_UP((unsigned long)NSEC_PER_SEC * 1000, 205 clk_get_rate(hw->clk)); 206 d = (val & mmc->delay_mask) >> __ffs(mmc->delay_mask); 207 degrees += d * mmc->delay_step_ps * 360 / period_ps; 208 degrees %= 360; 209 } 210 211 return degrees; 212 } 213 214 static void meson_mmc_apply_phase_delay(struct meson_mmc_phase *mmc, 215 unsigned int phase, 216 unsigned int delay) 217 { 218 u32 val; 219 220 val = readl(mmc->reg); 221 val &= ~mmc->phase_mask; 222 val |= phase << __ffs(mmc->phase_mask); 223 224 if (mmc->delay_mask) { 225 val &= ~mmc->delay_mask; 226 val |= delay << __ffs(mmc->delay_mask); 227 } 228 229 writel(val, mmc->reg); 230 } 231 232 static int meson_mmc_clk_set_phase(struct clk_hw *hw, int degrees) 233 { 234 struct meson_mmc_phase *mmc = to_meson_mmc_phase(hw); 235 unsigned int phase_num = 1 << hweight_long(mmc->phase_mask); 236 unsigned long period_ps, d = 0, r; 237 uint64_t p; 238 239 p = degrees % 360; 240 241 if (!mmc->delay_mask) { 242 p = DIV_ROUND_CLOSEST_ULL(p, 360 / phase_num); 243 } else { 244 period_ps = DIV_ROUND_UP((unsigned long)NSEC_PER_SEC * 1000, 245 clk_get_rate(hw->clk)); 246 247 /* First compute the phase index (p), the remainder (r) is the 248 * part we'll try to acheive using the delays (d). 249 */ 250 r = do_div(p, 360 / phase_num); 251 d = DIV_ROUND_CLOSEST(r * period_ps, 252 360 * mmc->delay_step_ps); 253 d = min(d, mmc->delay_mask >> __ffs(mmc->delay_mask)); 254 } 255 256 meson_mmc_apply_phase_delay(mmc, p, d); 257 return 0; 258 } 259 260 static const struct clk_ops meson_mmc_clk_phase_ops = { 261 .get_phase = meson_mmc_clk_get_phase, 262 .set_phase = meson_mmc_clk_set_phase, 263 }; 264 265 static unsigned int meson_mmc_get_timeout_msecs(struct mmc_data *data) 266 { 267 unsigned int timeout = data->timeout_ns / NSEC_PER_MSEC; 268 269 if (!timeout) 270 return SD_EMMC_CMD_TIMEOUT_DATA; 271 272 timeout = roundup_pow_of_two(timeout); 273 274 return min(timeout, 32768U); /* max. 2^15 ms */ 275 } 276 277 static struct mmc_command *meson_mmc_get_next_command(struct mmc_command *cmd) 278 { 279 if (cmd->opcode == MMC_SET_BLOCK_COUNT && !cmd->error) 280 return cmd->mrq->cmd; 281 else if (mmc_op_multi(cmd->opcode) && 282 (!cmd->mrq->sbc || cmd->error || cmd->data->error)) 283 return cmd->mrq->stop; 284 else 285 return NULL; 286 } 287 288 static void meson_mmc_get_transfer_mode(struct mmc_host *mmc, 289 struct mmc_request *mrq) 290 { 291 struct mmc_data *data = mrq->data; 292 struct scatterlist *sg; 293 int i; 294 bool use_desc_chain_mode = true; 295 296 /* 297 * Broken SDIO with AP6255-based WiFi on Khadas VIM Pro has been 298 * reported. For some strange reason this occurs in descriptor 299 * chain mode only. So let's fall back to bounce buffer mode 300 * for command SD_IO_RW_EXTENDED. 301 */ 302 if (mrq->cmd->opcode == SD_IO_RW_EXTENDED) 303 return; 304 305 for_each_sg(data->sg, sg, data->sg_len, i) 306 /* check for 8 byte alignment */ 307 if (sg->offset & 7) { 308 WARN_ONCE(1, "unaligned scatterlist buffer\n"); 309 use_desc_chain_mode = false; 310 break; 311 } 312 313 if (use_desc_chain_mode) 314 data->host_cookie |= SD_EMMC_DESC_CHAIN_MODE; 315 } 316 317 static inline bool meson_mmc_desc_chain_mode(const struct mmc_data *data) 318 { 319 return data->host_cookie & SD_EMMC_DESC_CHAIN_MODE; 320 } 321 322 static inline bool meson_mmc_bounce_buf_read(const struct mmc_data *data) 323 { 324 return data && data->flags & MMC_DATA_READ && 325 !meson_mmc_desc_chain_mode(data); 326 } 327 328 static void meson_mmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq) 329 { 330 struct mmc_data *data = mrq->data; 331 332 if (!data) 333 return; 334 335 meson_mmc_get_transfer_mode(mmc, mrq); 336 data->host_cookie |= SD_EMMC_PRE_REQ_DONE; 337 338 if (!meson_mmc_desc_chain_mode(data)) 339 return; 340 341 data->sg_count = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len, 342 mmc_get_dma_dir(data)); 343 if (!data->sg_count) 344 dev_err(mmc_dev(mmc), "dma_map_sg failed"); 345 } 346 347 static void meson_mmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq, 348 int err) 349 { 350 struct mmc_data *data = mrq->data; 351 352 if (data && meson_mmc_desc_chain_mode(data) && data->sg_count) 353 dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len, 354 mmc_get_dma_dir(data)); 355 } 356 357 static bool meson_mmc_timing_is_ddr(struct mmc_ios *ios) 358 { 359 if (ios->timing == MMC_TIMING_MMC_DDR52 || 360 ios->timing == MMC_TIMING_UHS_DDR50 || 361 ios->timing == MMC_TIMING_MMC_HS400) 362 return true; 363 364 return false; 365 } 366 367 /* 368 * Gating the clock on this controller is tricky. It seems the mmc clock 369 * is also used by the controller. It may crash during some operation if the 370 * clock is stopped. The safest thing to do, whenever possible, is to keep 371 * clock running at stop it at the pad using the pinmux. 372 */ 373 static void meson_mmc_clk_gate(struct meson_host *host) 374 { 375 u32 cfg; 376 377 if (host->pins_clk_gate) { 378 pinctrl_select_state(host->pinctrl, host->pins_clk_gate); 379 } else { 380 /* 381 * If the pinmux is not provided - default to the classic and 382 * unsafe method 383 */ 384 cfg = readl(host->regs + SD_EMMC_CFG); 385 cfg |= CFG_STOP_CLOCK; 386 writel(cfg, host->regs + SD_EMMC_CFG); 387 } 388 } 389 390 static void meson_mmc_clk_ungate(struct meson_host *host) 391 { 392 u32 cfg; 393 394 if (host->pins_clk_gate) 395 pinctrl_select_state(host->pinctrl, host->pins_default); 396 397 /* Make sure the clock is not stopped in the controller */ 398 cfg = readl(host->regs + SD_EMMC_CFG); 399 cfg &= ~CFG_STOP_CLOCK; 400 writel(cfg, host->regs + SD_EMMC_CFG); 401 } 402 403 static int meson_mmc_clk_set(struct meson_host *host, struct mmc_ios *ios) 404 { 405 struct mmc_host *mmc = host->mmc; 406 unsigned long rate = ios->clock; 407 int ret; 408 u32 cfg; 409 410 /* DDR modes require higher module clock */ 411 if (meson_mmc_timing_is_ddr(ios)) 412 rate <<= 1; 413 414 /* Same request - bail-out */ 415 if (host->req_rate == rate) 416 return 0; 417 418 /* stop clock */ 419 meson_mmc_clk_gate(host); 420 host->req_rate = 0; 421 422 if (!rate) { 423 mmc->actual_clock = 0; 424 /* return with clock being stopped */ 425 return 0; 426 } 427 428 /* Stop the clock during rate change to avoid glitches */ 429 cfg = readl(host->regs + SD_EMMC_CFG); 430 cfg |= CFG_STOP_CLOCK; 431 writel(cfg, host->regs + SD_EMMC_CFG); 432 433 ret = clk_set_rate(host->mmc_clk, rate); 434 if (ret) { 435 dev_err(host->dev, "Unable to set cfg_div_clk to %lu. ret=%d\n", 436 rate, ret); 437 return ret; 438 } 439 440 host->req_rate = rate; 441 mmc->actual_clock = clk_get_rate(host->mmc_clk); 442 443 /* We should report the real output frequency of the controller */ 444 if (meson_mmc_timing_is_ddr(ios)) 445 mmc->actual_clock >>= 1; 446 447 dev_dbg(host->dev, "clk rate: %u Hz\n", mmc->actual_clock); 448 if (ios->clock != mmc->actual_clock) 449 dev_dbg(host->dev, "requested rate was %u\n", ios->clock); 450 451 /* (re)start clock */ 452 meson_mmc_clk_ungate(host); 453 454 return 0; 455 } 456 457 /* 458 * The SD/eMMC IP block has an internal mux and divider used for 459 * generating the MMC clock. Use the clock framework to create and 460 * manage these clocks. 461 */ 462 static int meson_mmc_clk_init(struct meson_host *host) 463 { 464 struct clk_init_data init; 465 struct clk_mux *mux; 466 struct clk_divider *div; 467 struct meson_mmc_phase *core, *tx, *rx; 468 struct clk *clk; 469 char clk_name[32]; 470 int i, ret = 0; 471 const char *mux_parent_names[MUX_CLK_NUM_PARENTS]; 472 const char *clk_parent[1]; 473 u32 clk_reg; 474 475 /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */ 476 clk_reg = 0; 477 clk_reg |= CLK_ALWAYS_ON; 478 clk_reg |= CLK_DIV_MASK; 479 writel(clk_reg, host->regs + SD_EMMC_CLOCK); 480 481 /* get the mux parents */ 482 for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) { 483 struct clk *clk; 484 char name[16]; 485 486 snprintf(name, sizeof(name), "clkin%d", i); 487 clk = devm_clk_get(host->dev, name); 488 if (IS_ERR(clk)) { 489 if (clk != ERR_PTR(-EPROBE_DEFER)) 490 dev_err(host->dev, "Missing clock %s\n", name); 491 return PTR_ERR(clk); 492 } 493 494 mux_parent_names[i] = __clk_get_name(clk); 495 } 496 497 /* create the mux */ 498 mux = devm_kzalloc(host->dev, sizeof(*mux), GFP_KERNEL); 499 if (!mux) 500 return -ENOMEM; 501 502 snprintf(clk_name, sizeof(clk_name), "%s#mux", dev_name(host->dev)); 503 init.name = clk_name; 504 init.ops = &clk_mux_ops; 505 init.flags = 0; 506 init.parent_names = mux_parent_names; 507 init.num_parents = MUX_CLK_NUM_PARENTS; 508 509 mux->reg = host->regs + SD_EMMC_CLOCK; 510 mux->shift = __ffs(CLK_SRC_MASK); 511 mux->mask = CLK_SRC_MASK >> mux->shift; 512 mux->hw.init = &init; 513 514 clk = devm_clk_register(host->dev, &mux->hw); 515 if (WARN_ON(IS_ERR(clk))) 516 return PTR_ERR(clk); 517 518 /* create the divider */ 519 div = devm_kzalloc(host->dev, sizeof(*div), GFP_KERNEL); 520 if (!div) 521 return -ENOMEM; 522 523 snprintf(clk_name, sizeof(clk_name), "%s#div", dev_name(host->dev)); 524 init.name = clk_name; 525 init.ops = &clk_divider_ops; 526 init.flags = CLK_SET_RATE_PARENT; 527 clk_parent[0] = __clk_get_name(clk); 528 init.parent_names = clk_parent; 529 init.num_parents = 1; 530 531 div->reg = host->regs + SD_EMMC_CLOCK; 532 div->shift = __ffs(CLK_DIV_MASK); 533 div->width = __builtin_popcountl(CLK_DIV_MASK); 534 div->hw.init = &init; 535 div->flags = CLK_DIVIDER_ONE_BASED; 536 537 clk = devm_clk_register(host->dev, &div->hw); 538 if (WARN_ON(IS_ERR(clk))) 539 return PTR_ERR(clk); 540 541 /* create the mmc core clock */ 542 core = devm_kzalloc(host->dev, sizeof(*core), GFP_KERNEL); 543 if (!core) 544 return -ENOMEM; 545 546 snprintf(clk_name, sizeof(clk_name), "%s#core", dev_name(host->dev)); 547 init.name = clk_name; 548 init.ops = &meson_mmc_clk_phase_ops; 549 init.flags = CLK_SET_RATE_PARENT; 550 clk_parent[0] = __clk_get_name(clk); 551 init.parent_names = clk_parent; 552 init.num_parents = 1; 553 554 core->reg = host->regs + SD_EMMC_CLOCK; 555 core->phase_mask = CLK_CORE_PHASE_MASK; 556 core->hw.init = &init; 557 558 host->mmc_clk = devm_clk_register(host->dev, &core->hw); 559 if (WARN_ON(PTR_ERR_OR_ZERO(host->mmc_clk))) 560 return PTR_ERR(host->mmc_clk); 561 562 /* create the mmc tx clock */ 563 tx = devm_kzalloc(host->dev, sizeof(*tx), GFP_KERNEL); 564 if (!tx) 565 return -ENOMEM; 566 567 snprintf(clk_name, sizeof(clk_name), "%s#tx", dev_name(host->dev)); 568 init.name = clk_name; 569 init.ops = &meson_mmc_clk_phase_ops; 570 init.flags = 0; 571 clk_parent[0] = __clk_get_name(host->mmc_clk); 572 init.parent_names = clk_parent; 573 init.num_parents = 1; 574 575 tx->reg = host->regs + SD_EMMC_CLOCK; 576 tx->phase_mask = CLK_TX_PHASE_MASK; 577 tx->delay_mask = CLK_TX_DELAY_MASK; 578 tx->delay_step_ps = CLK_DELAY_STEP_PS; 579 tx->hw.init = &init; 580 581 host->tx_clk = devm_clk_register(host->dev, &tx->hw); 582 if (WARN_ON(PTR_ERR_OR_ZERO(host->tx_clk))) 583 return PTR_ERR(host->tx_clk); 584 585 /* create the mmc rx clock */ 586 rx = devm_kzalloc(host->dev, sizeof(*rx), GFP_KERNEL); 587 if (!rx) 588 return -ENOMEM; 589 590 snprintf(clk_name, sizeof(clk_name), "%s#rx", dev_name(host->dev)); 591 init.name = clk_name; 592 init.ops = &meson_mmc_clk_phase_ops; 593 init.flags = 0; 594 clk_parent[0] = __clk_get_name(host->mmc_clk); 595 init.parent_names = clk_parent; 596 init.num_parents = 1; 597 598 rx->reg = host->regs + SD_EMMC_CLOCK; 599 rx->phase_mask = CLK_RX_PHASE_MASK; 600 rx->delay_mask = CLK_RX_DELAY_MASK; 601 rx->delay_step_ps = CLK_DELAY_STEP_PS; 602 rx->hw.init = &init; 603 604 host->rx_clk = devm_clk_register(host->dev, &rx->hw); 605 if (WARN_ON(PTR_ERR_OR_ZERO(host->rx_clk))) 606 return PTR_ERR(host->rx_clk); 607 608 /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */ 609 host->mmc->f_min = clk_round_rate(host->mmc_clk, 400000); 610 ret = clk_set_rate(host->mmc_clk, host->mmc->f_min); 611 if (ret) 612 return ret; 613 614 /* 615 * Set phases : These values are mostly the datasheet recommended ones 616 * except for the Tx phase. Datasheet recommends 180 but some cards 617 * fail at initialisation with it. 270 works just fine, it fixes these 618 * initialisation issues and enable eMMC DDR52 mode. 619 */ 620 clk_set_phase(host->mmc_clk, 180); 621 clk_set_phase(host->tx_clk, 270); 622 clk_set_phase(host->rx_clk, 0); 623 624 return clk_prepare_enable(host->mmc_clk); 625 } 626 627 static void meson_mmc_shift_map(unsigned long *map, unsigned long shift) 628 { 629 DECLARE_BITMAP(left, CLK_PHASE_POINT_NUM); 630 DECLARE_BITMAP(right, CLK_PHASE_POINT_NUM); 631 632 /* 633 * shift the bitmap right and reintroduce the dropped bits on the left 634 * of the bitmap 635 */ 636 bitmap_shift_right(right, map, shift, CLK_PHASE_POINT_NUM); 637 bitmap_shift_left(left, map, CLK_PHASE_POINT_NUM - shift, 638 CLK_PHASE_POINT_NUM); 639 bitmap_or(map, left, right, CLK_PHASE_POINT_NUM); 640 } 641 642 static void meson_mmc_find_next_region(unsigned long *map, 643 unsigned long *start, 644 unsigned long *stop) 645 { 646 *start = find_next_bit(map, CLK_PHASE_POINT_NUM, *start); 647 *stop = find_next_zero_bit(map, CLK_PHASE_POINT_NUM, *start); 648 } 649 650 static int meson_mmc_find_tuning_point(unsigned long *test) 651 { 652 unsigned long shift, stop, offset = 0, start = 0, size = 0; 653 654 /* Get the all good/all bad situation out the way */ 655 if (bitmap_full(test, CLK_PHASE_POINT_NUM)) 656 return 0; /* All points are good so point 0 will do */ 657 else if (bitmap_empty(test, CLK_PHASE_POINT_NUM)) 658 return -EIO; /* No successful tuning point */ 659 660 /* 661 * Now we know there is a least one region find. Make sure it does 662 * not wrap by the shifting the bitmap if necessary 663 */ 664 shift = find_first_zero_bit(test, CLK_PHASE_POINT_NUM); 665 if (shift != 0) 666 meson_mmc_shift_map(test, shift); 667 668 while (start < CLK_PHASE_POINT_NUM) { 669 meson_mmc_find_next_region(test, &start, &stop); 670 671 if ((stop - start) > size) { 672 offset = start; 673 size = stop - start; 674 } 675 676 start = stop; 677 } 678 679 /* Get the center point of the region */ 680 offset += (size / 2); 681 682 /* Shift the result back */ 683 offset = (offset + shift) % CLK_PHASE_POINT_NUM; 684 685 return offset; 686 } 687 688 static int meson_mmc_clk_phase_tuning(struct mmc_host *mmc, u32 opcode, 689 struct clk *clk) 690 { 691 int point, ret; 692 DECLARE_BITMAP(test, CLK_PHASE_POINT_NUM); 693 694 dev_dbg(mmc_dev(mmc), "%s phase/delay tunning...\n", 695 __clk_get_name(clk)); 696 bitmap_zero(test, CLK_PHASE_POINT_NUM); 697 698 /* Explore tuning points */ 699 for (point = 0; point < CLK_PHASE_POINT_NUM; point++) { 700 clk_set_phase(clk, point * CLK_PHASE_STEP); 701 ret = mmc_send_tuning(mmc, opcode, NULL); 702 if (!ret) 703 set_bit(point, test); 704 } 705 706 /* Find the optimal tuning point and apply it */ 707 point = meson_mmc_find_tuning_point(test); 708 if (point < 0) 709 return point; /* tuning failed */ 710 711 clk_set_phase(clk, point * CLK_PHASE_STEP); 712 dev_dbg(mmc_dev(mmc), "success with phase: %d\n", 713 clk_get_phase(clk)); 714 return 0; 715 } 716 717 static int meson_mmc_execute_tuning(struct mmc_host *mmc, u32 opcode) 718 { 719 struct meson_host *host = mmc_priv(mmc); 720 721 return meson_mmc_clk_phase_tuning(mmc, opcode, host->rx_clk); 722 } 723 724 static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 725 { 726 struct meson_host *host = mmc_priv(mmc); 727 u32 bus_width, val; 728 int err; 729 730 /* 731 * GPIO regulator, only controls switching between 1v8 and 732 * 3v3, doesn't support MMC_POWER_OFF, MMC_POWER_ON. 733 */ 734 switch (ios->power_mode) { 735 case MMC_POWER_OFF: 736 if (!IS_ERR(mmc->supply.vmmc)) 737 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); 738 739 if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) { 740 regulator_disable(mmc->supply.vqmmc); 741 host->vqmmc_enabled = false; 742 } 743 744 break; 745 746 case MMC_POWER_UP: 747 if (!IS_ERR(mmc->supply.vmmc)) 748 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd); 749 750 /* Reset rx phase */ 751 clk_set_phase(host->rx_clk, 0); 752 753 break; 754 755 case MMC_POWER_ON: 756 if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) { 757 int ret = regulator_enable(mmc->supply.vqmmc); 758 759 if (ret < 0) 760 dev_err(host->dev, 761 "failed to enable vqmmc regulator\n"); 762 else 763 host->vqmmc_enabled = true; 764 } 765 766 break; 767 } 768 769 /* Bus width */ 770 switch (ios->bus_width) { 771 case MMC_BUS_WIDTH_1: 772 bus_width = CFG_BUS_WIDTH_1; 773 break; 774 case MMC_BUS_WIDTH_4: 775 bus_width = CFG_BUS_WIDTH_4; 776 break; 777 case MMC_BUS_WIDTH_8: 778 bus_width = CFG_BUS_WIDTH_8; 779 break; 780 default: 781 dev_err(host->dev, "Invalid ios->bus_width: %u. Setting to 4.\n", 782 ios->bus_width); 783 bus_width = CFG_BUS_WIDTH_4; 784 } 785 786 val = readl(host->regs + SD_EMMC_CFG); 787 val &= ~CFG_BUS_WIDTH_MASK; 788 val |= FIELD_PREP(CFG_BUS_WIDTH_MASK, bus_width); 789 790 val &= ~CFG_DDR; 791 if (meson_mmc_timing_is_ddr(ios)) 792 val |= CFG_DDR; 793 794 val &= ~CFG_CHK_DS; 795 if (ios->timing == MMC_TIMING_MMC_HS400) 796 val |= CFG_CHK_DS; 797 798 err = meson_mmc_clk_set(host, ios); 799 if (err) 800 dev_err(host->dev, "Failed to set clock: %d\n,", err); 801 802 writel(val, host->regs + SD_EMMC_CFG); 803 dev_dbg(host->dev, "SD_EMMC_CFG: 0x%08x\n", val); 804 } 805 806 static void meson_mmc_request_done(struct mmc_host *mmc, 807 struct mmc_request *mrq) 808 { 809 struct meson_host *host = mmc_priv(mmc); 810 811 host->cmd = NULL; 812 mmc_request_done(host->mmc, mrq); 813 } 814 815 static void meson_mmc_set_blksz(struct mmc_host *mmc, unsigned int blksz) 816 { 817 struct meson_host *host = mmc_priv(mmc); 818 u32 cfg, blksz_old; 819 820 cfg = readl(host->regs + SD_EMMC_CFG); 821 blksz_old = FIELD_GET(CFG_BLK_LEN_MASK, cfg); 822 823 if (!is_power_of_2(blksz)) 824 dev_err(host->dev, "blksz %u is not a power of 2\n", blksz); 825 826 blksz = ilog2(blksz); 827 828 /* check if block-size matches, if not update */ 829 if (blksz == blksz_old) 830 return; 831 832 dev_dbg(host->dev, "%s: update blk_len %d -> %d\n", __func__, 833 blksz_old, blksz); 834 835 cfg &= ~CFG_BLK_LEN_MASK; 836 cfg |= FIELD_PREP(CFG_BLK_LEN_MASK, blksz); 837 writel(cfg, host->regs + SD_EMMC_CFG); 838 } 839 840 static void meson_mmc_set_response_bits(struct mmc_command *cmd, u32 *cmd_cfg) 841 { 842 if (cmd->flags & MMC_RSP_PRESENT) { 843 if (cmd->flags & MMC_RSP_136) 844 *cmd_cfg |= CMD_CFG_RESP_128; 845 *cmd_cfg |= CMD_CFG_RESP_NUM; 846 847 if (!(cmd->flags & MMC_RSP_CRC)) 848 *cmd_cfg |= CMD_CFG_RESP_NOCRC; 849 850 if (cmd->flags & MMC_RSP_BUSY) 851 *cmd_cfg |= CMD_CFG_R1B; 852 } else { 853 *cmd_cfg |= CMD_CFG_NO_RESP; 854 } 855 } 856 857 static void meson_mmc_desc_chain_transfer(struct mmc_host *mmc, u32 cmd_cfg) 858 { 859 struct meson_host *host = mmc_priv(mmc); 860 struct sd_emmc_desc *desc = host->descs; 861 struct mmc_data *data = host->cmd->data; 862 struct scatterlist *sg; 863 u32 start; 864 int i; 865 866 if (data->flags & MMC_DATA_WRITE) 867 cmd_cfg |= CMD_CFG_DATA_WR; 868 869 if (data->blocks > 1) { 870 cmd_cfg |= CMD_CFG_BLOCK_MODE; 871 meson_mmc_set_blksz(mmc, data->blksz); 872 } 873 874 for_each_sg(data->sg, sg, data->sg_count, i) { 875 unsigned int len = sg_dma_len(sg); 876 877 if (data->blocks > 1) 878 len /= data->blksz; 879 880 desc[i].cmd_cfg = cmd_cfg; 881 desc[i].cmd_cfg |= FIELD_PREP(CMD_CFG_LENGTH_MASK, len); 882 if (i > 0) 883 desc[i].cmd_cfg |= CMD_CFG_NO_CMD; 884 desc[i].cmd_arg = host->cmd->arg; 885 desc[i].cmd_resp = 0; 886 desc[i].cmd_data = sg_dma_address(sg); 887 } 888 desc[data->sg_count - 1].cmd_cfg |= CMD_CFG_END_OF_CHAIN; 889 890 dma_wmb(); /* ensure descriptor is written before kicked */ 891 start = host->descs_dma_addr | START_DESC_BUSY; 892 writel(start, host->regs + SD_EMMC_START); 893 } 894 895 static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd) 896 { 897 struct meson_host *host = mmc_priv(mmc); 898 struct mmc_data *data = cmd->data; 899 u32 cmd_cfg = 0, cmd_data = 0; 900 unsigned int xfer_bytes = 0; 901 902 /* Setup descriptors */ 903 dma_rmb(); 904 905 host->cmd = cmd; 906 907 cmd_cfg |= FIELD_PREP(CMD_CFG_CMD_INDEX_MASK, cmd->opcode); 908 cmd_cfg |= CMD_CFG_OWNER; /* owned by CPU */ 909 910 meson_mmc_set_response_bits(cmd, &cmd_cfg); 911 912 /* data? */ 913 if (data) { 914 data->bytes_xfered = 0; 915 cmd_cfg |= CMD_CFG_DATA_IO; 916 cmd_cfg |= FIELD_PREP(CMD_CFG_TIMEOUT_MASK, 917 ilog2(meson_mmc_get_timeout_msecs(data))); 918 919 if (meson_mmc_desc_chain_mode(data)) { 920 meson_mmc_desc_chain_transfer(mmc, cmd_cfg); 921 return; 922 } 923 924 if (data->blocks > 1) { 925 cmd_cfg |= CMD_CFG_BLOCK_MODE; 926 cmd_cfg |= FIELD_PREP(CMD_CFG_LENGTH_MASK, 927 data->blocks); 928 meson_mmc_set_blksz(mmc, data->blksz); 929 } else { 930 cmd_cfg |= FIELD_PREP(CMD_CFG_LENGTH_MASK, data->blksz); 931 } 932 933 xfer_bytes = data->blksz * data->blocks; 934 if (data->flags & MMC_DATA_WRITE) { 935 cmd_cfg |= CMD_CFG_DATA_WR; 936 WARN_ON(xfer_bytes > host->bounce_buf_size); 937 sg_copy_to_buffer(data->sg, data->sg_len, 938 host->bounce_buf, xfer_bytes); 939 dma_wmb(); 940 } 941 942 cmd_data = host->bounce_dma_addr & CMD_DATA_MASK; 943 } else { 944 cmd_cfg |= FIELD_PREP(CMD_CFG_TIMEOUT_MASK, 945 ilog2(SD_EMMC_CMD_TIMEOUT)); 946 } 947 948 /* Last descriptor */ 949 cmd_cfg |= CMD_CFG_END_OF_CHAIN; 950 writel(cmd_cfg, host->regs + SD_EMMC_CMD_CFG); 951 writel(cmd_data, host->regs + SD_EMMC_CMD_DAT); 952 writel(0, host->regs + SD_EMMC_CMD_RSP); 953 wmb(); /* ensure descriptor is written before kicked */ 954 writel(cmd->arg, host->regs + SD_EMMC_CMD_ARG); 955 } 956 957 static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) 958 { 959 struct meson_host *host = mmc_priv(mmc); 960 bool needs_pre_post_req = mrq->data && 961 !(mrq->data->host_cookie & SD_EMMC_PRE_REQ_DONE); 962 963 if (needs_pre_post_req) { 964 meson_mmc_get_transfer_mode(mmc, mrq); 965 if (!meson_mmc_desc_chain_mode(mrq->data)) 966 needs_pre_post_req = false; 967 } 968 969 if (needs_pre_post_req) 970 meson_mmc_pre_req(mmc, mrq); 971 972 /* Stop execution */ 973 writel(0, host->regs + SD_EMMC_START); 974 975 meson_mmc_start_cmd(mmc, mrq->sbc ?: mrq->cmd); 976 977 if (needs_pre_post_req) 978 meson_mmc_post_req(mmc, mrq, 0); 979 } 980 981 static void meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd) 982 { 983 struct meson_host *host = mmc_priv(mmc); 984 985 if (cmd->flags & MMC_RSP_136) { 986 cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP3); 987 cmd->resp[1] = readl(host->regs + SD_EMMC_CMD_RSP2); 988 cmd->resp[2] = readl(host->regs + SD_EMMC_CMD_RSP1); 989 cmd->resp[3] = readl(host->regs + SD_EMMC_CMD_RSP); 990 } else if (cmd->flags & MMC_RSP_PRESENT) { 991 cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP); 992 } 993 } 994 995 static irqreturn_t meson_mmc_irq(int irq, void *dev_id) 996 { 997 struct meson_host *host = dev_id; 998 struct mmc_command *cmd; 999 struct mmc_data *data; 1000 u32 irq_en, status, raw_status; 1001 irqreturn_t ret = IRQ_NONE; 1002 1003 if (WARN_ON(!host) || WARN_ON(!host->cmd)) 1004 return IRQ_NONE; 1005 1006 spin_lock(&host->lock); 1007 1008 cmd = host->cmd; 1009 data = cmd->data; 1010 irq_en = readl(host->regs + SD_EMMC_IRQ_EN); 1011 raw_status = readl(host->regs + SD_EMMC_STATUS); 1012 status = raw_status & irq_en; 1013 1014 cmd->error = 0; 1015 if (status & IRQ_CRC_ERR) { 1016 dev_dbg(host->dev, "CRC Error - status 0x%08x\n", status); 1017 cmd->error = -EILSEQ; 1018 ret = IRQ_HANDLED; 1019 goto out; 1020 } 1021 1022 if (status & IRQ_TIMEOUTS) { 1023 dev_dbg(host->dev, "Timeout - status 0x%08x\n", status); 1024 cmd->error = -ETIMEDOUT; 1025 ret = IRQ_HANDLED; 1026 goto out; 1027 } 1028 1029 meson_mmc_read_resp(host->mmc, cmd); 1030 1031 if (status & IRQ_SDIO) { 1032 dev_dbg(host->dev, "IRQ: SDIO TODO.\n"); 1033 ret = IRQ_HANDLED; 1034 } 1035 1036 if (status & (IRQ_END_OF_CHAIN | IRQ_RESP_STATUS)) { 1037 if (data && !cmd->error) 1038 data->bytes_xfered = data->blksz * data->blocks; 1039 if (meson_mmc_bounce_buf_read(data) || 1040 meson_mmc_get_next_command(cmd)) 1041 ret = IRQ_WAKE_THREAD; 1042 else 1043 ret = IRQ_HANDLED; 1044 } 1045 1046 out: 1047 /* ack all enabled interrupts */ 1048 writel(irq_en, host->regs + SD_EMMC_STATUS); 1049 1050 if (ret == IRQ_HANDLED) 1051 meson_mmc_request_done(host->mmc, cmd->mrq); 1052 else if (ret == IRQ_NONE) 1053 dev_warn(host->dev, 1054 "Unexpected IRQ! status=0x%08x, irq_en=0x%08x\n", 1055 raw_status, irq_en); 1056 1057 spin_unlock(&host->lock); 1058 return ret; 1059 } 1060 1061 static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id) 1062 { 1063 struct meson_host *host = dev_id; 1064 struct mmc_command *next_cmd, *cmd = host->cmd; 1065 struct mmc_data *data; 1066 unsigned int xfer_bytes; 1067 1068 if (WARN_ON(!cmd)) 1069 return IRQ_NONE; 1070 1071 data = cmd->data; 1072 if (meson_mmc_bounce_buf_read(data)) { 1073 xfer_bytes = data->blksz * data->blocks; 1074 WARN_ON(xfer_bytes > host->bounce_buf_size); 1075 sg_copy_from_buffer(data->sg, data->sg_len, 1076 host->bounce_buf, xfer_bytes); 1077 } 1078 1079 next_cmd = meson_mmc_get_next_command(cmd); 1080 if (next_cmd) 1081 meson_mmc_start_cmd(host->mmc, next_cmd); 1082 else 1083 meson_mmc_request_done(host->mmc, cmd->mrq); 1084 1085 return IRQ_HANDLED; 1086 } 1087 1088 /* 1089 * NOTE: we only need this until the GPIO/pinctrl driver can handle 1090 * interrupts. For now, the MMC core will use this for polling. 1091 */ 1092 static int meson_mmc_get_cd(struct mmc_host *mmc) 1093 { 1094 int status = mmc_gpio_get_cd(mmc); 1095 1096 if (status == -ENOSYS) 1097 return 1; /* assume present */ 1098 1099 return status; 1100 } 1101 1102 static void meson_mmc_cfg_init(struct meson_host *host) 1103 { 1104 u32 cfg = 0; 1105 1106 cfg |= FIELD_PREP(CFG_RESP_TIMEOUT_MASK, 1107 ilog2(SD_EMMC_CFG_RESP_TIMEOUT)); 1108 cfg |= FIELD_PREP(CFG_RC_CC_MASK, ilog2(SD_EMMC_CFG_CMD_GAP)); 1109 cfg |= FIELD_PREP(CFG_BLK_LEN_MASK, ilog2(SD_EMMC_CFG_BLK_SIZE)); 1110 1111 writel(cfg, host->regs + SD_EMMC_CFG); 1112 } 1113 1114 static int meson_mmc_card_busy(struct mmc_host *mmc) 1115 { 1116 struct meson_host *host = mmc_priv(mmc); 1117 u32 regval; 1118 1119 regval = readl(host->regs + SD_EMMC_STATUS); 1120 1121 /* We are only interrested in lines 0 to 3, so mask the other ones */ 1122 return !(FIELD_GET(STATUS_DATI, regval) & 0xf); 1123 } 1124 1125 static int meson_mmc_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios) 1126 { 1127 /* vqmmc regulator is available */ 1128 if (!IS_ERR(mmc->supply.vqmmc)) { 1129 /* 1130 * The usual amlogic setup uses a GPIO to switch from one 1131 * regulator to the other. While the voltage ramp up is 1132 * pretty fast, care must be taken when switching from 3.3v 1133 * to 1.8v. Please make sure the regulator framework is aware 1134 * of your own regulator constraints 1135 */ 1136 return mmc_regulator_set_vqmmc(mmc, ios); 1137 } 1138 1139 /* no vqmmc regulator, assume fixed regulator at 3/3.3V */ 1140 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) 1141 return 0; 1142 1143 return -EINVAL; 1144 } 1145 1146 static const struct mmc_host_ops meson_mmc_ops = { 1147 .request = meson_mmc_request, 1148 .set_ios = meson_mmc_set_ios, 1149 .get_cd = meson_mmc_get_cd, 1150 .pre_req = meson_mmc_pre_req, 1151 .post_req = meson_mmc_post_req, 1152 .execute_tuning = meson_mmc_execute_tuning, 1153 .card_busy = meson_mmc_card_busy, 1154 .start_signal_voltage_switch = meson_mmc_voltage_switch, 1155 }; 1156 1157 static int meson_mmc_probe(struct platform_device *pdev) 1158 { 1159 struct resource *res; 1160 struct meson_host *host; 1161 struct mmc_host *mmc; 1162 int ret, irq; 1163 1164 mmc = mmc_alloc_host(sizeof(struct meson_host), &pdev->dev); 1165 if (!mmc) 1166 return -ENOMEM; 1167 host = mmc_priv(mmc); 1168 host->mmc = mmc; 1169 host->dev = &pdev->dev; 1170 dev_set_drvdata(&pdev->dev, host); 1171 1172 spin_lock_init(&host->lock); 1173 1174 /* Get regulators and the supported OCR mask */ 1175 host->vqmmc_enabled = false; 1176 ret = mmc_regulator_get_supply(mmc); 1177 if (ret) 1178 goto free_host; 1179 1180 ret = mmc_of_parse(mmc); 1181 if (ret) { 1182 if (ret != -EPROBE_DEFER) 1183 dev_warn(&pdev->dev, "error parsing DT: %d\n", ret); 1184 goto free_host; 1185 } 1186 1187 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1188 host->regs = devm_ioremap_resource(&pdev->dev, res); 1189 if (IS_ERR(host->regs)) { 1190 ret = PTR_ERR(host->regs); 1191 goto free_host; 1192 } 1193 1194 irq = platform_get_irq(pdev, 0); 1195 if (irq <= 0) { 1196 dev_err(&pdev->dev, "failed to get interrupt resource.\n"); 1197 ret = -EINVAL; 1198 goto free_host; 1199 } 1200 1201 host->pinctrl = devm_pinctrl_get(&pdev->dev); 1202 if (IS_ERR(host->pinctrl)) { 1203 ret = PTR_ERR(host->pinctrl); 1204 goto free_host; 1205 } 1206 1207 host->pins_default = pinctrl_lookup_state(host->pinctrl, 1208 PINCTRL_STATE_DEFAULT); 1209 if (IS_ERR(host->pins_default)) { 1210 ret = PTR_ERR(host->pins_default); 1211 goto free_host; 1212 } 1213 1214 host->pins_clk_gate = pinctrl_lookup_state(host->pinctrl, 1215 "clk-gate"); 1216 if (IS_ERR(host->pins_clk_gate)) { 1217 dev_warn(&pdev->dev, 1218 "can't get clk-gate pinctrl, using clk_stop bit\n"); 1219 host->pins_clk_gate = NULL; 1220 } 1221 1222 host->core_clk = devm_clk_get(&pdev->dev, "core"); 1223 if (IS_ERR(host->core_clk)) { 1224 ret = PTR_ERR(host->core_clk); 1225 goto free_host; 1226 } 1227 1228 ret = clk_prepare_enable(host->core_clk); 1229 if (ret) 1230 goto free_host; 1231 1232 ret = meson_mmc_clk_init(host); 1233 if (ret) 1234 goto err_core_clk; 1235 1236 /* set config to sane default */ 1237 meson_mmc_cfg_init(host); 1238 1239 /* Stop execution */ 1240 writel(0, host->regs + SD_EMMC_START); 1241 1242 /* clear, ack and enable interrupts */ 1243 writel(0, host->regs + SD_EMMC_IRQ_EN); 1244 writel(IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN, 1245 host->regs + SD_EMMC_STATUS); 1246 writel(IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN, 1247 host->regs + SD_EMMC_IRQ_EN); 1248 1249 ret = devm_request_threaded_irq(&pdev->dev, irq, meson_mmc_irq, 1250 meson_mmc_irq_thread, IRQF_SHARED, 1251 NULL, host); 1252 if (ret) 1253 goto err_init_clk; 1254 1255 mmc->caps |= MMC_CAP_CMD23; 1256 mmc->max_blk_count = CMD_CFG_LENGTH_MASK; 1257 mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size; 1258 mmc->max_segs = SD_EMMC_DESC_BUF_LEN / sizeof(struct sd_emmc_desc); 1259 mmc->max_seg_size = mmc->max_req_size; 1260 1261 /* data bounce buffer */ 1262 host->bounce_buf_size = mmc->max_req_size; 1263 host->bounce_buf = 1264 dma_alloc_coherent(host->dev, host->bounce_buf_size, 1265 &host->bounce_dma_addr, GFP_KERNEL); 1266 if (host->bounce_buf == NULL) { 1267 dev_err(host->dev, "Unable to map allocate DMA bounce buffer.\n"); 1268 ret = -ENOMEM; 1269 goto err_init_clk; 1270 } 1271 1272 host->descs = dma_alloc_coherent(host->dev, SD_EMMC_DESC_BUF_LEN, 1273 &host->descs_dma_addr, GFP_KERNEL); 1274 if (!host->descs) { 1275 dev_err(host->dev, "Allocating descriptor DMA buffer failed\n"); 1276 ret = -ENOMEM; 1277 goto err_bounce_buf; 1278 } 1279 1280 mmc->ops = &meson_mmc_ops; 1281 mmc_add_host(mmc); 1282 1283 return 0; 1284 1285 err_bounce_buf: 1286 dma_free_coherent(host->dev, host->bounce_buf_size, 1287 host->bounce_buf, host->bounce_dma_addr); 1288 err_init_clk: 1289 clk_disable_unprepare(host->mmc_clk); 1290 err_core_clk: 1291 clk_disable_unprepare(host->core_clk); 1292 free_host: 1293 mmc_free_host(mmc); 1294 return ret; 1295 } 1296 1297 static int meson_mmc_remove(struct platform_device *pdev) 1298 { 1299 struct meson_host *host = dev_get_drvdata(&pdev->dev); 1300 1301 mmc_remove_host(host->mmc); 1302 1303 /* disable interrupts */ 1304 writel(0, host->regs + SD_EMMC_IRQ_EN); 1305 1306 dma_free_coherent(host->dev, SD_EMMC_DESC_BUF_LEN, 1307 host->descs, host->descs_dma_addr); 1308 dma_free_coherent(host->dev, host->bounce_buf_size, 1309 host->bounce_buf, host->bounce_dma_addr); 1310 1311 clk_disable_unprepare(host->mmc_clk); 1312 clk_disable_unprepare(host->core_clk); 1313 1314 mmc_free_host(host->mmc); 1315 return 0; 1316 } 1317 1318 static const struct of_device_id meson_mmc_of_match[] = { 1319 { .compatible = "amlogic,meson-gx-mmc", }, 1320 { .compatible = "amlogic,meson-gxbb-mmc", }, 1321 { .compatible = "amlogic,meson-gxl-mmc", }, 1322 { .compatible = "amlogic,meson-gxm-mmc", }, 1323 {} 1324 }; 1325 MODULE_DEVICE_TABLE(of, meson_mmc_of_match); 1326 1327 static struct platform_driver meson_mmc_driver = { 1328 .probe = meson_mmc_probe, 1329 .remove = meson_mmc_remove, 1330 .driver = { 1331 .name = DRIVER_NAME, 1332 .of_match_table = of_match_ptr(meson_mmc_of_match), 1333 }, 1334 }; 1335 1336 module_platform_driver(meson_mmc_driver); 1337 1338 MODULE_DESCRIPTION("Amlogic S905*/GX* SD/eMMC driver"); 1339 MODULE_AUTHOR("Kevin Hilman <khilman@baylibre.com>"); 1340 MODULE_LICENSE("GPL v2"); 1341