1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Copyright (C) 2019 ASPEED Technology Inc. */ 3 /* Copyright (C) 2019 IBM Corp. */ 4 5 #include <linux/clk.h> 6 #include <linux/delay.h> 7 #include <linux/device.h> 8 #include <linux/io.h> 9 #include <linux/math64.h> 10 #include <linux/mmc/host.h> 11 #include <linux/module.h> 12 #include <linux/of_address.h> 13 #include <linux/of.h> 14 #include <linux/of_platform.h> 15 #include <linux/platform_device.h> 16 #include <linux/spinlock.h> 17 18 #include "sdhci-pltfm.h" 19 20 #define ASPEED_SDC_INFO 0x00 21 #define ASPEED_SDC_S1_MMC8 BIT(25) 22 #define ASPEED_SDC_S0_MMC8 BIT(24) 23 #define ASPEED_SDC_PHASE 0xf4 24 #define ASPEED_SDC_S1_PHASE_IN GENMASK(25, 21) 25 #define ASPEED_SDC_S0_PHASE_IN GENMASK(20, 16) 26 #define ASPEED_SDC_S1_PHASE_OUT GENMASK(15, 11) 27 #define ASPEED_SDC_S1_PHASE_IN_EN BIT(10) 28 #define ASPEED_SDC_S1_PHASE_OUT_EN GENMASK(9, 8) 29 #define ASPEED_SDC_S0_PHASE_OUT GENMASK(7, 3) 30 #define ASPEED_SDC_S0_PHASE_IN_EN BIT(2) 31 #define ASPEED_SDC_S0_PHASE_OUT_EN GENMASK(1, 0) 32 #define ASPEED_SDC_PHASE_MAX 31 33 34 /* SDIO{10,20} */ 35 #define ASPEED_SDC_CAP1_1_8V (0 * 32 + 26) 36 /* SDIO{14,24} */ 37 #define ASPEED_SDC_CAP2_SDR104 (1 * 32 + 1) 38 39 struct aspeed_sdc { 40 struct clk *clk; 41 struct resource *res; 42 43 spinlock_t lock; 44 void __iomem *regs; 45 }; 46 47 struct aspeed_sdhci_tap_param { 48 bool valid; 49 50 #define ASPEED_SDHCI_TAP_PARAM_INVERT_CLK BIT(4) 51 u8 in; 52 u8 out; 53 }; 54 55 struct aspeed_sdhci_tap_desc { 56 u32 tap_mask; 57 u32 enable_mask; 58 u8 enable_value; 59 }; 60 61 struct aspeed_sdhci_phase_desc { 62 struct aspeed_sdhci_tap_desc in; 63 struct aspeed_sdhci_tap_desc out; 64 }; 65 66 struct aspeed_sdhci_pdata { 67 unsigned int clk_div_start; 68 const struct aspeed_sdhci_phase_desc *phase_desc; 69 size_t nr_phase_descs; 70 }; 71 72 struct aspeed_sdhci { 73 const struct aspeed_sdhci_pdata *pdata; 74 struct aspeed_sdc *parent; 75 u32 width_mask; 76 struct mmc_clk_phase_map phase_map; 77 const struct aspeed_sdhci_phase_desc *phase_desc; 78 }; 79 80 /* 81 * The function sets the mirror register for updating 82 * capbilities of the current slot. 83 * 84 * slot | capability | caps_reg | mirror_reg 85 * -----|-------------|----------|------------ 86 * 0 | CAP1_1_8V | SDIO140 | SDIO10 87 * 0 | CAP2_SDR104 | SDIO144 | SDIO14 88 * 1 | CAP1_1_8V | SDIO240 | SDIO20 89 * 1 | CAP2_SDR104 | SDIO244 | SDIO24 90 */ 91 static void aspeed_sdc_set_slot_capability(struct sdhci_host *host, struct aspeed_sdc *sdc, 92 int capability, bool enable, u8 slot) 93 { 94 u32 mirror_reg_offset; 95 u32 cap_val; 96 u8 cap_reg; 97 98 if (slot > 1) 99 return; 100 101 cap_reg = capability / 32; 102 cap_val = sdhci_readl(host, 0x40 + (cap_reg * 4)); 103 if (enable) 104 cap_val |= BIT(capability % 32); 105 else 106 cap_val &= ~BIT(capability % 32); 107 mirror_reg_offset = ((slot + 1) * 0x10) + (cap_reg * 4); 108 writel(cap_val, sdc->regs + mirror_reg_offset); 109 } 110 111 static void aspeed_sdc_configure_8bit_mode(struct aspeed_sdc *sdc, 112 struct aspeed_sdhci *sdhci, 113 bool bus8) 114 { 115 u32 info; 116 117 /* Set/clear 8 bit mode */ 118 spin_lock(&sdc->lock); 119 info = readl(sdc->regs + ASPEED_SDC_INFO); 120 if (bus8) 121 info |= sdhci->width_mask; 122 else 123 info &= ~sdhci->width_mask; 124 writel(info, sdc->regs + ASPEED_SDC_INFO); 125 spin_unlock(&sdc->lock); 126 } 127 128 static u32 129 aspeed_sdc_set_phase_tap(const struct aspeed_sdhci_tap_desc *desc, 130 u8 tap, bool enable, u32 reg) 131 { 132 reg &= ~(desc->enable_mask | desc->tap_mask); 133 if (enable) { 134 reg |= tap << __ffs(desc->tap_mask); 135 reg |= desc->enable_value << __ffs(desc->enable_mask); 136 } 137 138 return reg; 139 } 140 141 static void 142 aspeed_sdc_set_phase_taps(struct aspeed_sdc *sdc, 143 const struct aspeed_sdhci_phase_desc *desc, 144 const struct aspeed_sdhci_tap_param *taps) 145 { 146 u32 reg; 147 148 spin_lock(&sdc->lock); 149 reg = readl(sdc->regs + ASPEED_SDC_PHASE); 150 151 reg = aspeed_sdc_set_phase_tap(&desc->in, taps->in, taps->valid, reg); 152 reg = aspeed_sdc_set_phase_tap(&desc->out, taps->out, taps->valid, reg); 153 154 writel(reg, sdc->regs + ASPEED_SDC_PHASE); 155 spin_unlock(&sdc->lock); 156 } 157 158 #define PICOSECONDS_PER_SECOND 1000000000000ULL 159 #define ASPEED_SDHCI_NR_TAPS 15 160 /* Measured value with *handwave* environmentals and static loading */ 161 #define ASPEED_SDHCI_MAX_TAP_DELAY_PS 1253 162 static int aspeed_sdhci_phase_to_tap(struct device *dev, unsigned long rate_hz, 163 int phase_deg) 164 { 165 u64 phase_period_ps; 166 u64 prop_delay_ps; 167 u64 clk_period_ps; 168 unsigned int tap; 169 u8 inverted; 170 171 phase_deg %= 360; 172 173 if (phase_deg >= 180) { 174 inverted = ASPEED_SDHCI_TAP_PARAM_INVERT_CLK; 175 phase_deg -= 180; 176 dev_dbg(dev, 177 "Inverting clock to reduce phase correction from %d to %d degrees\n", 178 phase_deg + 180, phase_deg); 179 } else { 180 inverted = 0; 181 } 182 183 prop_delay_ps = ASPEED_SDHCI_MAX_TAP_DELAY_PS / ASPEED_SDHCI_NR_TAPS; 184 clk_period_ps = div_u64(PICOSECONDS_PER_SECOND, (u64)rate_hz); 185 phase_period_ps = div_u64((u64)phase_deg * clk_period_ps, 360ULL); 186 187 tap = div_u64(phase_period_ps, prop_delay_ps); 188 if (tap > ASPEED_SDHCI_NR_TAPS) { 189 dev_dbg(dev, 190 "Requested out of range phase tap %d for %d degrees of phase compensation at %luHz, clamping to tap %d\n", 191 tap, phase_deg, rate_hz, ASPEED_SDHCI_NR_TAPS); 192 tap = ASPEED_SDHCI_NR_TAPS; 193 } 194 195 return inverted | tap; 196 } 197 198 static void 199 aspeed_sdhci_phases_to_taps(struct device *dev, unsigned long rate, 200 const struct mmc_clk_phase *phases, 201 struct aspeed_sdhci_tap_param *taps) 202 { 203 taps->valid = phases->valid; 204 205 if (!phases->valid) 206 return; 207 208 taps->in = aspeed_sdhci_phase_to_tap(dev, rate, phases->in_deg); 209 taps->out = aspeed_sdhci_phase_to_tap(dev, rate, phases->out_deg); 210 } 211 212 static void 213 aspeed_sdhci_configure_phase(struct sdhci_host *host, unsigned long rate) 214 { 215 struct aspeed_sdhci_tap_param _taps = {0}, *taps = &_taps; 216 struct mmc_clk_phase *params; 217 struct aspeed_sdhci *sdhci; 218 struct device *dev; 219 220 dev = mmc_dev(host->mmc); 221 sdhci = sdhci_pltfm_priv(sdhci_priv(host)); 222 223 if (!sdhci->phase_desc) 224 return; 225 226 params = &sdhci->phase_map.phase[host->timing]; 227 aspeed_sdhci_phases_to_taps(dev, rate, params, taps); 228 aspeed_sdc_set_phase_taps(sdhci->parent, sdhci->phase_desc, taps); 229 dev_dbg(dev, 230 "Using taps [%d, %d] for [%d, %d] degrees of phase correction at %luHz (%d)\n", 231 taps->in & ASPEED_SDHCI_NR_TAPS, 232 taps->out & ASPEED_SDHCI_NR_TAPS, 233 params->in_deg, params->out_deg, rate, host->timing); 234 } 235 236 static void aspeed_sdhci_set_clock(struct sdhci_host *host, unsigned int clock) 237 { 238 struct sdhci_pltfm_host *pltfm_host; 239 unsigned long parent, bus; 240 struct aspeed_sdhci *sdhci; 241 int div; 242 u16 clk; 243 244 pltfm_host = sdhci_priv(host); 245 sdhci = sdhci_pltfm_priv(pltfm_host); 246 247 parent = clk_get_rate(pltfm_host->clk); 248 249 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL); 250 251 if (clock == 0) 252 return; 253 254 if (WARN_ON(clock > host->max_clk)) 255 clock = host->max_clk; 256 257 /* 258 * Regarding the AST2600: 259 * 260 * If (EMMC12C[7:6], EMMC12C[15:8] == 0) then 261 * period of SDCLK = period of SDMCLK. 262 * 263 * If (EMMC12C[7:6], EMMC12C[15:8] != 0) then 264 * period of SDCLK = period of SDMCLK * 2 * (EMMC12C[7:6], EMMC[15:8]) 265 * 266 * If you keep EMMC12C[7:6] = 0 and EMMC12C[15:8] as one-hot, 267 * 0x1/0x2/0x4/etc, you will find it is compatible to AST2400 or AST2500 268 * 269 * Keep the one-hot behaviour for backwards compatibility except for 270 * supporting the value 0 in (EMMC12C[7:6], EMMC12C[15:8]), and capture 271 * the 0-value capability in clk_div_start. 272 */ 273 for (div = sdhci->pdata->clk_div_start; div < 256; div *= 2) { 274 bus = parent / div; 275 if (bus <= clock) 276 break; 277 } 278 279 div >>= 1; 280 281 clk = div << SDHCI_DIVIDER_SHIFT; 282 283 aspeed_sdhci_configure_phase(host, bus); 284 285 sdhci_enable_clk(host, clk); 286 } 287 288 static unsigned int aspeed_sdhci_get_max_clock(struct sdhci_host *host) 289 { 290 if (host->mmc->f_max) 291 return host->mmc->f_max; 292 293 return sdhci_pltfm_clk_get_max_clock(host); 294 } 295 296 static void aspeed_sdhci_set_bus_width(struct sdhci_host *host, int width) 297 { 298 struct sdhci_pltfm_host *pltfm_priv; 299 struct aspeed_sdhci *aspeed_sdhci; 300 struct aspeed_sdc *aspeed_sdc; 301 u8 ctrl; 302 303 pltfm_priv = sdhci_priv(host); 304 aspeed_sdhci = sdhci_pltfm_priv(pltfm_priv); 305 aspeed_sdc = aspeed_sdhci->parent; 306 307 /* Set/clear 8-bit mode */ 308 aspeed_sdc_configure_8bit_mode(aspeed_sdc, aspeed_sdhci, 309 width == MMC_BUS_WIDTH_8); 310 311 /* Set/clear 1 or 4 bit mode */ 312 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 313 if (width == MMC_BUS_WIDTH_4) 314 ctrl |= SDHCI_CTRL_4BITBUS; 315 else 316 ctrl &= ~SDHCI_CTRL_4BITBUS; 317 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 318 } 319 320 static u32 aspeed_sdhci_readl(struct sdhci_host *host, int reg) 321 { 322 u32 val = readl(host->ioaddr + reg); 323 324 if (unlikely(reg == SDHCI_PRESENT_STATE) && 325 (host->mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH)) 326 val ^= SDHCI_CARD_PRESENT; 327 328 return val; 329 } 330 331 static const struct sdhci_ops aspeed_sdhci_ops = { 332 .read_l = aspeed_sdhci_readl, 333 .set_clock = aspeed_sdhci_set_clock, 334 .get_max_clock = aspeed_sdhci_get_max_clock, 335 .set_bus_width = aspeed_sdhci_set_bus_width, 336 .get_timeout_clock = sdhci_pltfm_clk_get_max_clock, 337 .reset = sdhci_reset, 338 .set_uhs_signaling = sdhci_set_uhs_signaling, 339 }; 340 341 static const struct sdhci_pltfm_data aspeed_sdhci_pdata = { 342 .ops = &aspeed_sdhci_ops, 343 .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, 344 }; 345 346 static inline int aspeed_sdhci_calculate_slot(struct aspeed_sdhci *dev, 347 struct resource *res) 348 { 349 resource_size_t delta; 350 351 if (!res || resource_type(res) != IORESOURCE_MEM) 352 return -EINVAL; 353 354 if (res->start < dev->parent->res->start) 355 return -EINVAL; 356 357 delta = res->start - dev->parent->res->start; 358 if (delta & (0x100 - 1)) 359 return -EINVAL; 360 361 return (delta / 0x100) - 1; 362 } 363 364 static int aspeed_sdhci_probe(struct platform_device *pdev) 365 { 366 const struct aspeed_sdhci_pdata *aspeed_pdata; 367 struct device_node *np = pdev->dev.of_node; 368 struct sdhci_pltfm_host *pltfm_host; 369 struct aspeed_sdhci *dev; 370 struct sdhci_host *host; 371 struct resource *res; 372 int slot; 373 int ret; 374 375 aspeed_pdata = of_device_get_match_data(&pdev->dev); 376 if (!aspeed_pdata) { 377 dev_err(&pdev->dev, "Missing platform configuration data\n"); 378 return -EINVAL; 379 } 380 381 host = sdhci_pltfm_init(pdev, &aspeed_sdhci_pdata, sizeof(*dev)); 382 if (IS_ERR(host)) 383 return PTR_ERR(host); 384 385 pltfm_host = sdhci_priv(host); 386 dev = sdhci_pltfm_priv(pltfm_host); 387 dev->pdata = aspeed_pdata; 388 dev->parent = dev_get_drvdata(pdev->dev.parent); 389 390 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 391 slot = aspeed_sdhci_calculate_slot(dev, res); 392 393 if (slot < 0) 394 return slot; 395 else if (slot >= 2) 396 return -EINVAL; 397 398 if (slot < dev->pdata->nr_phase_descs) { 399 dev->phase_desc = &dev->pdata->phase_desc[slot]; 400 } else { 401 dev_info(&pdev->dev, 402 "Phase control not supported for slot %d\n", slot); 403 dev->phase_desc = NULL; 404 } 405 406 dev->width_mask = !slot ? ASPEED_SDC_S0_MMC8 : ASPEED_SDC_S1_MMC8; 407 408 dev_info(&pdev->dev, "Configured for slot %d\n", slot); 409 410 sdhci_get_of_property(pdev); 411 412 if (of_property_read_bool(np, "mmc-hs200-1_8v") || 413 of_property_read_bool(np, "sd-uhs-sdr104")) { 414 aspeed_sdc_set_slot_capability(host, dev->parent, ASPEED_SDC_CAP1_1_8V, 415 true, slot); 416 } 417 418 if (of_property_read_bool(np, "sd-uhs-sdr104")) { 419 aspeed_sdc_set_slot_capability(host, dev->parent, ASPEED_SDC_CAP2_SDR104, 420 true, slot); 421 } 422 423 pltfm_host->clk = devm_clk_get(&pdev->dev, NULL); 424 if (IS_ERR(pltfm_host->clk)) 425 return PTR_ERR(pltfm_host->clk); 426 427 ret = clk_prepare_enable(pltfm_host->clk); 428 if (ret) { 429 dev_err(&pdev->dev, "Unable to enable SDIO clock\n"); 430 goto err_pltfm_free; 431 } 432 433 ret = mmc_of_parse(host->mmc); 434 if (ret) 435 goto err_sdhci_add; 436 437 if (dev->phase_desc) 438 mmc_of_parse_clk_phase(&pdev->dev, &dev->phase_map); 439 440 ret = sdhci_add_host(host); 441 if (ret) 442 goto err_sdhci_add; 443 444 return 0; 445 446 err_sdhci_add: 447 clk_disable_unprepare(pltfm_host->clk); 448 err_pltfm_free: 449 sdhci_pltfm_free(pdev); 450 return ret; 451 } 452 453 static void aspeed_sdhci_remove(struct platform_device *pdev) 454 { 455 struct sdhci_pltfm_host *pltfm_host; 456 struct sdhci_host *host; 457 458 host = platform_get_drvdata(pdev); 459 pltfm_host = sdhci_priv(host); 460 461 sdhci_remove_host(host, 0); 462 463 clk_disable_unprepare(pltfm_host->clk); 464 465 sdhci_pltfm_free(pdev); 466 } 467 468 static const struct aspeed_sdhci_pdata ast2400_sdhci_pdata = { 469 .clk_div_start = 2, 470 }; 471 472 static const struct aspeed_sdhci_phase_desc ast2600_sdhci_phase[] = { 473 /* SDHCI/Slot 0 */ 474 [0] = { 475 .in = { 476 .tap_mask = ASPEED_SDC_S0_PHASE_IN, 477 .enable_mask = ASPEED_SDC_S0_PHASE_IN_EN, 478 .enable_value = 1, 479 }, 480 .out = { 481 .tap_mask = ASPEED_SDC_S0_PHASE_OUT, 482 .enable_mask = ASPEED_SDC_S0_PHASE_OUT_EN, 483 .enable_value = 3, 484 }, 485 }, 486 /* SDHCI/Slot 1 */ 487 [1] = { 488 .in = { 489 .tap_mask = ASPEED_SDC_S1_PHASE_IN, 490 .enable_mask = ASPEED_SDC_S1_PHASE_IN_EN, 491 .enable_value = 1, 492 }, 493 .out = { 494 .tap_mask = ASPEED_SDC_S1_PHASE_OUT, 495 .enable_mask = ASPEED_SDC_S1_PHASE_OUT_EN, 496 .enable_value = 3, 497 }, 498 }, 499 }; 500 501 static const struct aspeed_sdhci_pdata ast2600_sdhci_pdata = { 502 .clk_div_start = 1, 503 .phase_desc = ast2600_sdhci_phase, 504 .nr_phase_descs = ARRAY_SIZE(ast2600_sdhci_phase), 505 }; 506 507 static const struct of_device_id aspeed_sdhci_of_match[] = { 508 { .compatible = "aspeed,ast2400-sdhci", .data = &ast2400_sdhci_pdata, }, 509 { .compatible = "aspeed,ast2500-sdhci", .data = &ast2400_sdhci_pdata, }, 510 { .compatible = "aspeed,ast2600-sdhci", .data = &ast2600_sdhci_pdata, }, 511 { } 512 }; 513 MODULE_DEVICE_TABLE(of, aspeed_sdhci_of_match); 514 515 static struct platform_driver aspeed_sdhci_driver = { 516 .driver = { 517 .name = "sdhci-aspeed", 518 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 519 .of_match_table = aspeed_sdhci_of_match, 520 }, 521 .probe = aspeed_sdhci_probe, 522 .remove_new = aspeed_sdhci_remove, 523 }; 524 525 static int aspeed_sdc_probe(struct platform_device *pdev) 526 527 { 528 struct device_node *parent, *child; 529 struct aspeed_sdc *sdc; 530 int ret; 531 532 sdc = devm_kzalloc(&pdev->dev, sizeof(*sdc), GFP_KERNEL); 533 if (!sdc) 534 return -ENOMEM; 535 536 spin_lock_init(&sdc->lock); 537 538 sdc->clk = devm_clk_get(&pdev->dev, NULL); 539 if (IS_ERR(sdc->clk)) 540 return PTR_ERR(sdc->clk); 541 542 ret = clk_prepare_enable(sdc->clk); 543 if (ret) { 544 dev_err(&pdev->dev, "Unable to enable SDCLK\n"); 545 return ret; 546 } 547 548 sdc->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &sdc->res); 549 if (IS_ERR(sdc->regs)) { 550 ret = PTR_ERR(sdc->regs); 551 goto err_clk; 552 } 553 554 dev_set_drvdata(&pdev->dev, sdc); 555 556 parent = pdev->dev.of_node; 557 for_each_available_child_of_node(parent, child) { 558 struct platform_device *cpdev; 559 560 cpdev = of_platform_device_create(child, NULL, &pdev->dev); 561 if (!cpdev) { 562 of_node_put(child); 563 ret = -ENODEV; 564 goto err_clk; 565 } 566 } 567 568 return 0; 569 570 err_clk: 571 clk_disable_unprepare(sdc->clk); 572 return ret; 573 } 574 575 static void aspeed_sdc_remove(struct platform_device *pdev) 576 { 577 struct aspeed_sdc *sdc = dev_get_drvdata(&pdev->dev); 578 579 clk_disable_unprepare(sdc->clk); 580 } 581 582 static const struct of_device_id aspeed_sdc_of_match[] = { 583 { .compatible = "aspeed,ast2400-sd-controller", }, 584 { .compatible = "aspeed,ast2500-sd-controller", }, 585 { .compatible = "aspeed,ast2600-sd-controller", }, 586 { } 587 }; 588 589 MODULE_DEVICE_TABLE(of, aspeed_sdc_of_match); 590 591 static struct platform_driver aspeed_sdc_driver = { 592 .driver = { 593 .name = "sd-controller-aspeed", 594 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 595 .pm = &sdhci_pltfm_pmops, 596 .of_match_table = aspeed_sdc_of_match, 597 }, 598 .probe = aspeed_sdc_probe, 599 .remove_new = aspeed_sdc_remove, 600 }; 601 602 #if defined(CONFIG_MMC_SDHCI_OF_ASPEED_TEST) 603 #include "sdhci-of-aspeed-test.c" 604 #endif 605 606 static int __init aspeed_sdc_init(void) 607 { 608 int rc; 609 610 rc = platform_driver_register(&aspeed_sdhci_driver); 611 if (rc < 0) 612 return rc; 613 614 rc = platform_driver_register(&aspeed_sdc_driver); 615 if (rc < 0) 616 platform_driver_unregister(&aspeed_sdhci_driver); 617 618 return rc; 619 } 620 module_init(aspeed_sdc_init); 621 622 static void __exit aspeed_sdc_exit(void) 623 { 624 platform_driver_unregister(&aspeed_sdc_driver); 625 platform_driver_unregister(&aspeed_sdhci_driver); 626 } 627 module_exit(aspeed_sdc_exit); 628 629 MODULE_DESCRIPTION("Driver for the ASPEED SD/SDIO/SDHCI Controllers"); 630 MODULE_AUTHOR("Ryan Chen <ryan_chen@aspeedtech.com>"); 631 MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>"); 632 MODULE_LICENSE("GPL"); 633