1 /* 2 * Exynos Specific Extensions for Synopsys DW Multimedia Card Interface driver 3 * 4 * Copyright (C) 2012, Samsung Electronics Co., Ltd. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/platform_device.h> 14 #include <linux/clk.h> 15 #include <linux/mmc/host.h> 16 #include <linux/mmc/mmc.h> 17 #include <linux/of.h> 18 #include <linux/of_gpio.h> 19 #include <linux/pm_runtime.h> 20 #include <linux/slab.h> 21 22 #include "dw_mmc.h" 23 #include "dw_mmc-pltfm.h" 24 #include "dw_mmc-exynos.h" 25 26 /* Variations in Exynos specific dw-mshc controller */ 27 enum dw_mci_exynos_type { 28 DW_MCI_TYPE_EXYNOS4210, 29 DW_MCI_TYPE_EXYNOS4412, 30 DW_MCI_TYPE_EXYNOS5250, 31 DW_MCI_TYPE_EXYNOS5420, 32 DW_MCI_TYPE_EXYNOS5420_SMU, 33 DW_MCI_TYPE_EXYNOS7, 34 DW_MCI_TYPE_EXYNOS7_SMU, 35 }; 36 37 /* Exynos implementation specific driver private data */ 38 struct dw_mci_exynos_priv_data { 39 enum dw_mci_exynos_type ctrl_type; 40 u8 ciu_div; 41 u32 sdr_timing; 42 u32 ddr_timing; 43 u32 hs400_timing; 44 u32 tuned_sample; 45 u32 cur_speed; 46 u32 dqs_delay; 47 u32 saved_dqs_en; 48 u32 saved_strobe_ctrl; 49 }; 50 51 static struct dw_mci_exynos_compatible { 52 char *compatible; 53 enum dw_mci_exynos_type ctrl_type; 54 } exynos_compat[] = { 55 { 56 .compatible = "samsung,exynos4210-dw-mshc", 57 .ctrl_type = DW_MCI_TYPE_EXYNOS4210, 58 }, { 59 .compatible = "samsung,exynos4412-dw-mshc", 60 .ctrl_type = DW_MCI_TYPE_EXYNOS4412, 61 }, { 62 .compatible = "samsung,exynos5250-dw-mshc", 63 .ctrl_type = DW_MCI_TYPE_EXYNOS5250, 64 }, { 65 .compatible = "samsung,exynos5420-dw-mshc", 66 .ctrl_type = DW_MCI_TYPE_EXYNOS5420, 67 }, { 68 .compatible = "samsung,exynos5420-dw-mshc-smu", 69 .ctrl_type = DW_MCI_TYPE_EXYNOS5420_SMU, 70 }, { 71 .compatible = "samsung,exynos7-dw-mshc", 72 .ctrl_type = DW_MCI_TYPE_EXYNOS7, 73 }, { 74 .compatible = "samsung,exynos7-dw-mshc-smu", 75 .ctrl_type = DW_MCI_TYPE_EXYNOS7_SMU, 76 }, 77 }; 78 79 static inline u8 dw_mci_exynos_get_ciu_div(struct dw_mci *host) 80 { 81 struct dw_mci_exynos_priv_data *priv = host->priv; 82 83 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412) 84 return EXYNOS4412_FIXED_CIU_CLK_DIV; 85 else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210) 86 return EXYNOS4210_FIXED_CIU_CLK_DIV; 87 else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 88 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 89 return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL64)) + 1; 90 else 91 return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL)) + 1; 92 } 93 94 static void dw_mci_exynos_config_smu(struct dw_mci *host) 95 { 96 struct dw_mci_exynos_priv_data *priv = host->priv; 97 98 /* 99 * If Exynos is provided the Security management, 100 * set for non-ecryption mode at this time. 101 */ 102 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS5420_SMU || 103 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) { 104 mci_writel(host, MPSBEGIN0, 0); 105 mci_writel(host, MPSEND0, SDMMC_ENDING_SEC_NR_MAX); 106 mci_writel(host, MPSCTRL0, SDMMC_MPSCTRL_SECURE_WRITE_BIT | 107 SDMMC_MPSCTRL_NON_SECURE_READ_BIT | 108 SDMMC_MPSCTRL_VALID | 109 SDMMC_MPSCTRL_NON_SECURE_WRITE_BIT); 110 } 111 } 112 113 static int dw_mci_exynos_priv_init(struct dw_mci *host) 114 { 115 struct dw_mci_exynos_priv_data *priv = host->priv; 116 117 dw_mci_exynos_config_smu(host); 118 119 if (priv->ctrl_type >= DW_MCI_TYPE_EXYNOS5420) { 120 priv->saved_strobe_ctrl = mci_readl(host, HS400_DLINE_CTRL); 121 priv->saved_dqs_en = mci_readl(host, HS400_DQS_EN); 122 priv->saved_dqs_en |= AXI_NON_BLOCKING_WR; 123 mci_writel(host, HS400_DQS_EN, priv->saved_dqs_en); 124 if (!priv->dqs_delay) 125 priv->dqs_delay = 126 DQS_CTRL_GET_RD_DELAY(priv->saved_strobe_ctrl); 127 } 128 129 host->bus_hz /= (priv->ciu_div + 1); 130 131 return 0; 132 } 133 134 static void dw_mci_exynos_set_clksel_timing(struct dw_mci *host, u32 timing) 135 { 136 struct dw_mci_exynos_priv_data *priv = host->priv; 137 u32 clksel; 138 139 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 140 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 141 clksel = mci_readl(host, CLKSEL64); 142 else 143 clksel = mci_readl(host, CLKSEL); 144 145 clksel = (clksel & ~SDMMC_CLKSEL_TIMING_MASK) | timing; 146 147 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 148 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 149 mci_writel(host, CLKSEL64, clksel); 150 else 151 mci_writel(host, CLKSEL, clksel); 152 153 /* 154 * Exynos4412 and Exynos5250 extends the use of CMD register with the 155 * use of bit 29 (which is reserved on standard MSHC controllers) for 156 * optionally bypassing the HOLD register for command and data. The 157 * HOLD register should be bypassed in case there is no phase shift 158 * applied on CMD/DATA that is sent to the card. 159 */ 160 if (!SDMMC_CLKSEL_GET_DRV_WD3(clksel) && host->cur_slot) 161 set_bit(DW_MMC_CARD_NO_USE_HOLD, &host->cur_slot->flags); 162 } 163 164 #ifdef CONFIG_PM 165 static int dw_mci_exynos_runtime_resume(struct device *dev) 166 { 167 struct dw_mci *host = dev_get_drvdata(dev); 168 169 dw_mci_exynos_config_smu(host); 170 return dw_mci_runtime_resume(dev); 171 } 172 173 /** 174 * dw_mci_exynos_resume_noirq - Exynos-specific resume code 175 * 176 * On exynos5420 there is a silicon errata that will sometimes leave the 177 * WAKEUP_INT bit in the CLKSEL register asserted. This bit is 1 to indicate 178 * that it fired and we can clear it by writing a 1 back. Clear it to prevent 179 * interrupts from going off constantly. 180 * 181 * We run this code on all exynos variants because it doesn't hurt. 182 */ 183 184 static int dw_mci_exynos_resume_noirq(struct device *dev) 185 { 186 struct dw_mci *host = dev_get_drvdata(dev); 187 struct dw_mci_exynos_priv_data *priv = host->priv; 188 u32 clksel; 189 190 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 191 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 192 clksel = mci_readl(host, CLKSEL64); 193 else 194 clksel = mci_readl(host, CLKSEL); 195 196 if (clksel & SDMMC_CLKSEL_WAKEUP_INT) { 197 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 198 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 199 mci_writel(host, CLKSEL64, clksel); 200 else 201 mci_writel(host, CLKSEL, clksel); 202 } 203 204 return 0; 205 } 206 #else 207 #define dw_mci_exynos_resume_noirq NULL 208 #endif /* CONFIG_PM */ 209 210 static void dw_mci_exynos_config_hs400(struct dw_mci *host, u32 timing) 211 { 212 struct dw_mci_exynos_priv_data *priv = host->priv; 213 u32 dqs, strobe; 214 215 /* 216 * Not supported to configure register 217 * related to HS400 218 */ 219 if (priv->ctrl_type < DW_MCI_TYPE_EXYNOS5420) { 220 if (timing == MMC_TIMING_MMC_HS400) 221 dev_warn(host->dev, 222 "cannot configure HS400, unsupported chipset\n"); 223 return; 224 } 225 226 dqs = priv->saved_dqs_en; 227 strobe = priv->saved_strobe_ctrl; 228 229 if (timing == MMC_TIMING_MMC_HS400) { 230 dqs |= DATA_STROBE_EN; 231 strobe = DQS_CTRL_RD_DELAY(strobe, priv->dqs_delay); 232 } else { 233 dqs &= ~DATA_STROBE_EN; 234 } 235 236 mci_writel(host, HS400_DQS_EN, dqs); 237 mci_writel(host, HS400_DLINE_CTRL, strobe); 238 } 239 240 static void dw_mci_exynos_adjust_clock(struct dw_mci *host, unsigned int wanted) 241 { 242 struct dw_mci_exynos_priv_data *priv = host->priv; 243 unsigned long actual; 244 u8 div; 245 int ret; 246 /* 247 * Don't care if wanted clock is zero or 248 * ciu clock is unavailable 249 */ 250 if (!wanted || IS_ERR(host->ciu_clk)) 251 return; 252 253 /* Guaranteed minimum frequency for cclkin */ 254 if (wanted < EXYNOS_CCLKIN_MIN) 255 wanted = EXYNOS_CCLKIN_MIN; 256 257 if (wanted == priv->cur_speed) 258 return; 259 260 div = dw_mci_exynos_get_ciu_div(host); 261 ret = clk_set_rate(host->ciu_clk, wanted * div); 262 if (ret) 263 dev_warn(host->dev, 264 "failed to set clk-rate %u error: %d\n", 265 wanted * div, ret); 266 actual = clk_get_rate(host->ciu_clk); 267 host->bus_hz = actual / div; 268 priv->cur_speed = wanted; 269 host->current_speed = 0; 270 } 271 272 static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios) 273 { 274 struct dw_mci_exynos_priv_data *priv = host->priv; 275 unsigned int wanted = ios->clock; 276 u32 timing = ios->timing, clksel; 277 278 switch (timing) { 279 case MMC_TIMING_MMC_HS400: 280 /* Update tuned sample timing */ 281 clksel = SDMMC_CLKSEL_UP_SAMPLE( 282 priv->hs400_timing, priv->tuned_sample); 283 wanted <<= 1; 284 break; 285 case MMC_TIMING_MMC_DDR52: 286 clksel = priv->ddr_timing; 287 /* Should be double rate for DDR mode */ 288 if (ios->bus_width == MMC_BUS_WIDTH_8) 289 wanted <<= 1; 290 break; 291 default: 292 clksel = priv->sdr_timing; 293 } 294 295 /* Set clock timing for the requested speed mode*/ 296 dw_mci_exynos_set_clksel_timing(host, clksel); 297 298 /* Configure setting for HS400 */ 299 dw_mci_exynos_config_hs400(host, timing); 300 301 /* Configure clock rate */ 302 dw_mci_exynos_adjust_clock(host, wanted); 303 } 304 305 static int dw_mci_exynos_parse_dt(struct dw_mci *host) 306 { 307 struct dw_mci_exynos_priv_data *priv; 308 struct device_node *np = host->dev->of_node; 309 u32 timing[2]; 310 u32 div = 0; 311 int idx; 312 int ret; 313 314 priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL); 315 if (!priv) 316 return -ENOMEM; 317 318 for (idx = 0; idx < ARRAY_SIZE(exynos_compat); idx++) { 319 if (of_device_is_compatible(np, exynos_compat[idx].compatible)) 320 priv->ctrl_type = exynos_compat[idx].ctrl_type; 321 } 322 323 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412) 324 priv->ciu_div = EXYNOS4412_FIXED_CIU_CLK_DIV - 1; 325 else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210) 326 priv->ciu_div = EXYNOS4210_FIXED_CIU_CLK_DIV - 1; 327 else { 328 of_property_read_u32(np, "samsung,dw-mshc-ciu-div", &div); 329 priv->ciu_div = div; 330 } 331 332 ret = of_property_read_u32_array(np, 333 "samsung,dw-mshc-sdr-timing", timing, 2); 334 if (ret) 335 return ret; 336 337 priv->sdr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div); 338 339 ret = of_property_read_u32_array(np, 340 "samsung,dw-mshc-ddr-timing", timing, 2); 341 if (ret) 342 return ret; 343 344 priv->ddr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div); 345 346 ret = of_property_read_u32_array(np, 347 "samsung,dw-mshc-hs400-timing", timing, 2); 348 if (!ret && of_property_read_u32(np, 349 "samsung,read-strobe-delay", &priv->dqs_delay)) 350 dev_dbg(host->dev, 351 "read-strobe-delay is not found, assuming usage of default value\n"); 352 353 priv->hs400_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], 354 HS400_FIXED_CIU_CLK_DIV); 355 host->priv = priv; 356 return 0; 357 } 358 359 static inline u8 dw_mci_exynos_get_clksmpl(struct dw_mci *host) 360 { 361 struct dw_mci_exynos_priv_data *priv = host->priv; 362 363 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 364 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 365 return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL64)); 366 else 367 return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL)); 368 } 369 370 static inline void dw_mci_exynos_set_clksmpl(struct dw_mci *host, u8 sample) 371 { 372 u32 clksel; 373 struct dw_mci_exynos_priv_data *priv = host->priv; 374 375 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 376 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 377 clksel = mci_readl(host, CLKSEL64); 378 else 379 clksel = mci_readl(host, CLKSEL); 380 clksel = SDMMC_CLKSEL_UP_SAMPLE(clksel, sample); 381 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 382 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 383 mci_writel(host, CLKSEL64, clksel); 384 else 385 mci_writel(host, CLKSEL, clksel); 386 } 387 388 static inline u8 dw_mci_exynos_move_next_clksmpl(struct dw_mci *host) 389 { 390 struct dw_mci_exynos_priv_data *priv = host->priv; 391 u32 clksel; 392 u8 sample; 393 394 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 395 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 396 clksel = mci_readl(host, CLKSEL64); 397 else 398 clksel = mci_readl(host, CLKSEL); 399 400 sample = (clksel + 1) & 0x7; 401 clksel = SDMMC_CLKSEL_UP_SAMPLE(clksel, sample); 402 403 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 404 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 405 mci_writel(host, CLKSEL64, clksel); 406 else 407 mci_writel(host, CLKSEL, clksel); 408 409 return sample; 410 } 411 412 static s8 dw_mci_exynos_get_best_clksmpl(u8 candiates) 413 { 414 const u8 iter = 8; 415 u8 __c; 416 s8 i, loc = -1; 417 418 for (i = 0; i < iter; i++) { 419 __c = ror8(candiates, i); 420 if ((__c & 0xc7) == 0xc7) { 421 loc = i; 422 goto out; 423 } 424 } 425 426 for (i = 0; i < iter; i++) { 427 __c = ror8(candiates, i); 428 if ((__c & 0x83) == 0x83) { 429 loc = i; 430 goto out; 431 } 432 } 433 434 out: 435 return loc; 436 } 437 438 static int dw_mci_exynos_execute_tuning(struct dw_mci_slot *slot, u32 opcode) 439 { 440 struct dw_mci *host = slot->host; 441 struct dw_mci_exynos_priv_data *priv = host->priv; 442 struct mmc_host *mmc = slot->mmc; 443 u8 start_smpl, smpl, candiates = 0; 444 s8 found = -1; 445 int ret = 0; 446 447 start_smpl = dw_mci_exynos_get_clksmpl(host); 448 449 do { 450 mci_writel(host, TMOUT, ~0); 451 smpl = dw_mci_exynos_move_next_clksmpl(host); 452 453 if (!mmc_send_tuning(mmc, opcode, NULL)) 454 candiates |= (1 << smpl); 455 456 } while (start_smpl != smpl); 457 458 found = dw_mci_exynos_get_best_clksmpl(candiates); 459 if (found >= 0) { 460 dw_mci_exynos_set_clksmpl(host, found); 461 priv->tuned_sample = found; 462 } else { 463 ret = -EIO; 464 } 465 466 return ret; 467 } 468 469 static int dw_mci_exynos_prepare_hs400_tuning(struct dw_mci *host, 470 struct mmc_ios *ios) 471 { 472 struct dw_mci_exynos_priv_data *priv = host->priv; 473 474 dw_mci_exynos_set_clksel_timing(host, priv->hs400_timing); 475 dw_mci_exynos_adjust_clock(host, (ios->clock) << 1); 476 477 return 0; 478 } 479 480 /* Common capabilities of Exynos4/Exynos5 SoC */ 481 static unsigned long exynos_dwmmc_caps[4] = { 482 MMC_CAP_1_8V_DDR | MMC_CAP_8_BIT_DATA | MMC_CAP_CMD23, 483 MMC_CAP_CMD23, 484 MMC_CAP_CMD23, 485 MMC_CAP_CMD23, 486 }; 487 488 static const struct dw_mci_drv_data exynos_drv_data = { 489 .caps = exynos_dwmmc_caps, 490 .init = dw_mci_exynos_priv_init, 491 .set_ios = dw_mci_exynos_set_ios, 492 .parse_dt = dw_mci_exynos_parse_dt, 493 .execute_tuning = dw_mci_exynos_execute_tuning, 494 .prepare_hs400_tuning = dw_mci_exynos_prepare_hs400_tuning, 495 }; 496 497 static const struct of_device_id dw_mci_exynos_match[] = { 498 { .compatible = "samsung,exynos4412-dw-mshc", 499 .data = &exynos_drv_data, }, 500 { .compatible = "samsung,exynos5250-dw-mshc", 501 .data = &exynos_drv_data, }, 502 { .compatible = "samsung,exynos5420-dw-mshc", 503 .data = &exynos_drv_data, }, 504 { .compatible = "samsung,exynos5420-dw-mshc-smu", 505 .data = &exynos_drv_data, }, 506 { .compatible = "samsung,exynos7-dw-mshc", 507 .data = &exynos_drv_data, }, 508 { .compatible = "samsung,exynos7-dw-mshc-smu", 509 .data = &exynos_drv_data, }, 510 {}, 511 }; 512 MODULE_DEVICE_TABLE(of, dw_mci_exynos_match); 513 514 static int dw_mci_exynos_probe(struct platform_device *pdev) 515 { 516 const struct dw_mci_drv_data *drv_data; 517 const struct of_device_id *match; 518 int ret; 519 520 match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node); 521 drv_data = match->data; 522 523 pm_runtime_get_noresume(&pdev->dev); 524 pm_runtime_set_active(&pdev->dev); 525 pm_runtime_enable(&pdev->dev); 526 527 ret = dw_mci_pltfm_register(pdev, drv_data); 528 if (ret) { 529 pm_runtime_disable(&pdev->dev); 530 pm_runtime_set_suspended(&pdev->dev); 531 pm_runtime_put_noidle(&pdev->dev); 532 533 return ret; 534 } 535 536 return 0; 537 } 538 539 static int dw_mci_exynos_remove(struct platform_device *pdev) 540 { 541 pm_runtime_disable(&pdev->dev); 542 pm_runtime_set_suspended(&pdev->dev); 543 pm_runtime_put_noidle(&pdev->dev); 544 545 return dw_mci_pltfm_remove(pdev); 546 } 547 548 static const struct dev_pm_ops dw_mci_exynos_pmops = { 549 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 550 pm_runtime_force_resume) 551 SET_RUNTIME_PM_OPS(dw_mci_runtime_suspend, 552 dw_mci_exynos_runtime_resume, 553 NULL) 554 .resume_noirq = dw_mci_exynos_resume_noirq, 555 .thaw_noirq = dw_mci_exynos_resume_noirq, 556 .restore_noirq = dw_mci_exynos_resume_noirq, 557 }; 558 559 static struct platform_driver dw_mci_exynos_pltfm_driver = { 560 .probe = dw_mci_exynos_probe, 561 .remove = dw_mci_exynos_remove, 562 .driver = { 563 .name = "dwmmc_exynos", 564 .of_match_table = dw_mci_exynos_match, 565 .pm = &dw_mci_exynos_pmops, 566 }, 567 }; 568 569 module_platform_driver(dw_mci_exynos_pltfm_driver); 570 571 MODULE_DESCRIPTION("Samsung Specific DW-MSHC Driver Extension"); 572 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com"); 573 MODULE_LICENSE("GPL v2"); 574 MODULE_ALIAS("platform:dwmmc_exynos"); 575