1 /* 2 * Driver for Marvell Xenon SDHC as a platform device 3 * 4 * Copyright (C) 2016 Marvell, All Rights Reserved. 5 * 6 * Author: Hu Ziji <huziji@marvell.com> 7 * Date: 2016-8-24 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation version 2. 12 * 13 * Inspired by Jisheng Zhang <jszhang@marvell.com> 14 * Special thanks to Video BG4 project team. 15 */ 16 17 #include <linux/delay.h> 18 #include <linux/ktime.h> 19 #include <linux/module.h> 20 #include <linux/of.h> 21 #include <linux/pm.h> 22 #include <linux/pm_runtime.h> 23 24 #include "sdhci-pltfm.h" 25 #include "sdhci-xenon.h" 26 27 static int xenon_enable_internal_clk(struct sdhci_host *host) 28 { 29 u32 reg; 30 ktime_t timeout; 31 32 reg = sdhci_readl(host, SDHCI_CLOCK_CONTROL); 33 reg |= SDHCI_CLOCK_INT_EN; 34 sdhci_writel(host, reg, SDHCI_CLOCK_CONTROL); 35 /* Wait max 20 ms */ 36 timeout = ktime_add_ms(ktime_get(), 20); 37 while (!((reg = sdhci_readw(host, SDHCI_CLOCK_CONTROL)) 38 & SDHCI_CLOCK_INT_STABLE)) { 39 if (ktime_after(ktime_get(), timeout)) { 40 dev_err(mmc_dev(host->mmc), "Internal clock never stabilised.\n"); 41 return -ETIMEDOUT; 42 } 43 usleep_range(900, 1100); 44 } 45 46 return 0; 47 } 48 49 /* Set SDCLK-off-while-idle */ 50 static void xenon_set_sdclk_off_idle(struct sdhci_host *host, 51 unsigned char sdhc_id, bool enable) 52 { 53 u32 reg; 54 u32 mask; 55 56 reg = sdhci_readl(host, XENON_SYS_OP_CTRL); 57 /* Get the bit shift basing on the SDHC index */ 58 mask = (0x1 << (XENON_SDCLK_IDLEOFF_ENABLE_SHIFT + sdhc_id)); 59 if (enable) 60 reg |= mask; 61 else 62 reg &= ~mask; 63 64 sdhci_writel(host, reg, XENON_SYS_OP_CTRL); 65 } 66 67 /* Enable/Disable the Auto Clock Gating function */ 68 static void xenon_set_acg(struct sdhci_host *host, bool enable) 69 { 70 u32 reg; 71 72 reg = sdhci_readl(host, XENON_SYS_OP_CTRL); 73 if (enable) 74 reg &= ~XENON_AUTO_CLKGATE_DISABLE_MASK; 75 else 76 reg |= XENON_AUTO_CLKGATE_DISABLE_MASK; 77 sdhci_writel(host, reg, XENON_SYS_OP_CTRL); 78 } 79 80 /* Enable this SDHC */ 81 static void xenon_enable_sdhc(struct sdhci_host *host, 82 unsigned char sdhc_id) 83 { 84 u32 reg; 85 86 reg = sdhci_readl(host, XENON_SYS_OP_CTRL); 87 reg |= (BIT(sdhc_id) << XENON_SLOT_ENABLE_SHIFT); 88 sdhci_writel(host, reg, XENON_SYS_OP_CTRL); 89 90 host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY; 91 /* 92 * Force to clear BUS_TEST to 93 * skip bus_test_pre and bus_test_post 94 */ 95 host->mmc->caps &= ~MMC_CAP_BUS_WIDTH_TEST; 96 } 97 98 /* Disable this SDHC */ 99 static void xenon_disable_sdhc(struct sdhci_host *host, 100 unsigned char sdhc_id) 101 { 102 u32 reg; 103 104 reg = sdhci_readl(host, XENON_SYS_OP_CTRL); 105 reg &= ~(BIT(sdhc_id) << XENON_SLOT_ENABLE_SHIFT); 106 sdhci_writel(host, reg, XENON_SYS_OP_CTRL); 107 } 108 109 /* Enable Parallel Transfer Mode */ 110 static void xenon_enable_sdhc_parallel_tran(struct sdhci_host *host, 111 unsigned char sdhc_id) 112 { 113 u32 reg; 114 115 reg = sdhci_readl(host, XENON_SYS_EXT_OP_CTRL); 116 reg |= BIT(sdhc_id); 117 sdhci_writel(host, reg, XENON_SYS_EXT_OP_CTRL); 118 } 119 120 /* Mask command conflict error */ 121 static void xenon_mask_cmd_conflict_err(struct sdhci_host *host) 122 { 123 u32 reg; 124 125 reg = sdhci_readl(host, XENON_SYS_EXT_OP_CTRL); 126 reg |= XENON_MASK_CMD_CONFLICT_ERR; 127 sdhci_writel(host, reg, XENON_SYS_EXT_OP_CTRL); 128 } 129 130 static void xenon_retune_setup(struct sdhci_host *host) 131 { 132 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 133 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); 134 u32 reg; 135 136 /* Disable the Re-Tuning Request functionality */ 137 reg = sdhci_readl(host, XENON_SLOT_RETUNING_REQ_CTRL); 138 reg &= ~XENON_RETUNING_COMPATIBLE; 139 sdhci_writel(host, reg, XENON_SLOT_RETUNING_REQ_CTRL); 140 141 /* Disable the Re-tuning Interrupt */ 142 reg = sdhci_readl(host, SDHCI_SIGNAL_ENABLE); 143 reg &= ~SDHCI_INT_RETUNE; 144 sdhci_writel(host, reg, SDHCI_SIGNAL_ENABLE); 145 reg = sdhci_readl(host, SDHCI_INT_ENABLE); 146 reg &= ~SDHCI_INT_RETUNE; 147 sdhci_writel(host, reg, SDHCI_INT_ENABLE); 148 149 /* Force to use Tuning Mode 1 */ 150 host->tuning_mode = SDHCI_TUNING_MODE_1; 151 /* Set re-tuning period */ 152 host->tuning_count = 1 << (priv->tuning_count - 1); 153 } 154 155 /* 156 * Operations inside struct sdhci_ops 157 */ 158 /* Recover the Register Setting cleared during SOFTWARE_RESET_ALL */ 159 static void xenon_reset_exit(struct sdhci_host *host, 160 unsigned char sdhc_id, u8 mask) 161 { 162 /* Only SOFTWARE RESET ALL will clear the register setting */ 163 if (!(mask & SDHCI_RESET_ALL)) 164 return; 165 166 /* Disable tuning request and auto-retuning again */ 167 xenon_retune_setup(host); 168 169 xenon_set_acg(host, true); 170 171 xenon_set_sdclk_off_idle(host, sdhc_id, false); 172 173 xenon_mask_cmd_conflict_err(host); 174 } 175 176 static void xenon_reset(struct sdhci_host *host, u8 mask) 177 { 178 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 179 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); 180 181 sdhci_reset(host, mask); 182 xenon_reset_exit(host, priv->sdhc_id, mask); 183 } 184 185 /* 186 * Xenon defines different values for HS200 and HS400 187 * in Host_Control_2 188 */ 189 static void xenon_set_uhs_signaling(struct sdhci_host *host, 190 unsigned int timing) 191 { 192 u16 ctrl_2; 193 194 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 195 /* Select Bus Speed Mode for host */ 196 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; 197 if (timing == MMC_TIMING_MMC_HS200) 198 ctrl_2 |= XENON_CTRL_HS200; 199 else if (timing == MMC_TIMING_UHS_SDR104) 200 ctrl_2 |= SDHCI_CTRL_UHS_SDR104; 201 else if (timing == MMC_TIMING_UHS_SDR12) 202 ctrl_2 |= SDHCI_CTRL_UHS_SDR12; 203 else if (timing == MMC_TIMING_UHS_SDR25) 204 ctrl_2 |= SDHCI_CTRL_UHS_SDR25; 205 else if (timing == MMC_TIMING_UHS_SDR50) 206 ctrl_2 |= SDHCI_CTRL_UHS_SDR50; 207 else if ((timing == MMC_TIMING_UHS_DDR50) || 208 (timing == MMC_TIMING_MMC_DDR52)) 209 ctrl_2 |= SDHCI_CTRL_UHS_DDR50; 210 else if (timing == MMC_TIMING_MMC_HS400) 211 ctrl_2 |= XENON_CTRL_HS400; 212 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); 213 } 214 215 static void xenon_set_power(struct sdhci_host *host, unsigned char mode, 216 unsigned short vdd) 217 { 218 struct mmc_host *mmc = host->mmc; 219 u8 pwr = host->pwr; 220 221 sdhci_set_power_noreg(host, mode, vdd); 222 223 if (host->pwr == pwr) 224 return; 225 226 if (host->pwr == 0) 227 vdd = 0; 228 229 if (!IS_ERR(mmc->supply.vmmc)) 230 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); 231 } 232 233 static const struct sdhci_ops sdhci_xenon_ops = { 234 .set_clock = sdhci_set_clock, 235 .set_power = xenon_set_power, 236 .set_bus_width = sdhci_set_bus_width, 237 .reset = xenon_reset, 238 .set_uhs_signaling = xenon_set_uhs_signaling, 239 .get_max_clock = sdhci_pltfm_clk_get_max_clock, 240 }; 241 242 static const struct sdhci_pltfm_data sdhci_xenon_pdata = { 243 .ops = &sdhci_xenon_ops, 244 .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | 245 SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER | 246 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, 247 }; 248 249 /* 250 * Xenon Specific Operations in mmc_host_ops 251 */ 252 static void xenon_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 253 { 254 struct sdhci_host *host = mmc_priv(mmc); 255 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 256 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); 257 u32 reg; 258 259 /* 260 * HS400/HS200/eMMC HS doesn't have Preset Value register. 261 * However, sdhci_set_ios will read HS400/HS200 Preset register. 262 * Disable Preset Value register for HS400/HS200. 263 * eMMC HS with preset_enabled set will trigger a bug in 264 * get_preset_value(). 265 */ 266 if ((ios->timing == MMC_TIMING_MMC_HS400) || 267 (ios->timing == MMC_TIMING_MMC_HS200) || 268 (ios->timing == MMC_TIMING_MMC_HS)) { 269 host->preset_enabled = false; 270 host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN; 271 host->flags &= ~SDHCI_PV_ENABLED; 272 273 reg = sdhci_readw(host, SDHCI_HOST_CONTROL2); 274 reg &= ~SDHCI_CTRL_PRESET_VAL_ENABLE; 275 sdhci_writew(host, reg, SDHCI_HOST_CONTROL2); 276 } else { 277 host->quirks2 &= ~SDHCI_QUIRK2_PRESET_VALUE_BROKEN; 278 } 279 280 sdhci_set_ios(mmc, ios); 281 xenon_phy_adj(host, ios); 282 283 if (host->clock > XENON_DEFAULT_SDCLK_FREQ) 284 xenon_set_sdclk_off_idle(host, priv->sdhc_id, true); 285 } 286 287 static int xenon_start_signal_voltage_switch(struct mmc_host *mmc, 288 struct mmc_ios *ios) 289 { 290 struct sdhci_host *host = mmc_priv(mmc); 291 292 /* 293 * Before SD/SDIO set signal voltage, SD bus clock should be 294 * disabled. However, sdhci_set_clock will also disable the Internal 295 * clock in mmc_set_signal_voltage(). 296 * If Internal clock is disabled, the 3.3V/1.8V bit can not be updated. 297 * Thus here manually enable internal clock. 298 * 299 * After switch completes, it is unnecessary to disable internal clock, 300 * since keeping internal clock active obeys SD spec. 301 */ 302 xenon_enable_internal_clk(host); 303 304 xenon_soc_pad_ctrl(host, ios->signal_voltage); 305 306 /* 307 * If Vqmmc is fixed on platform, vqmmc regulator should be unavailable. 308 * Thus SDHCI_CTRL_VDD_180 bit might not work then. 309 * Skip the standard voltage switch to avoid any issue. 310 */ 311 if (PTR_ERR(mmc->supply.vqmmc) == -ENODEV) 312 return 0; 313 314 return sdhci_start_signal_voltage_switch(mmc, ios); 315 } 316 317 /* 318 * Update card type. 319 * priv->init_card_type will be used in PHY timing adjustment. 320 */ 321 static void xenon_init_card(struct mmc_host *mmc, struct mmc_card *card) 322 { 323 struct sdhci_host *host = mmc_priv(mmc); 324 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 325 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); 326 327 /* Update card type*/ 328 priv->init_card_type = card->type; 329 } 330 331 static int xenon_execute_tuning(struct mmc_host *mmc, u32 opcode) 332 { 333 struct sdhci_host *host = mmc_priv(mmc); 334 335 if (host->timing == MMC_TIMING_UHS_DDR50 || 336 host->timing == MMC_TIMING_MMC_DDR52) 337 return 0; 338 339 /* 340 * Currently force Xenon driver back to support mode 1 only, 341 * even though Xenon might claim to support mode 2 or mode 3. 342 * It requires more time to test mode 2/mode 3 on more platforms. 343 */ 344 if (host->tuning_mode != SDHCI_TUNING_MODE_1) 345 xenon_retune_setup(host); 346 347 return sdhci_execute_tuning(mmc, opcode); 348 } 349 350 static void xenon_enable_sdio_irq(struct mmc_host *mmc, int enable) 351 { 352 struct sdhci_host *host = mmc_priv(mmc); 353 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 354 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); 355 u32 reg; 356 u8 sdhc_id = priv->sdhc_id; 357 358 sdhci_enable_sdio_irq(mmc, enable); 359 360 if (enable) { 361 /* 362 * Set SDIO Card Inserted indication 363 * to enable detecting SDIO async irq. 364 */ 365 reg = sdhci_readl(host, XENON_SYS_CFG_INFO); 366 reg |= (1 << (sdhc_id + XENON_SLOT_TYPE_SDIO_SHIFT)); 367 sdhci_writel(host, reg, XENON_SYS_CFG_INFO); 368 } else { 369 /* Clear SDIO Card Inserted indication */ 370 reg = sdhci_readl(host, XENON_SYS_CFG_INFO); 371 reg &= ~(1 << (sdhc_id + XENON_SLOT_TYPE_SDIO_SHIFT)); 372 sdhci_writel(host, reg, XENON_SYS_CFG_INFO); 373 } 374 } 375 376 static void xenon_replace_mmc_host_ops(struct sdhci_host *host) 377 { 378 host->mmc_host_ops.set_ios = xenon_set_ios; 379 host->mmc_host_ops.start_signal_voltage_switch = 380 xenon_start_signal_voltage_switch; 381 host->mmc_host_ops.init_card = xenon_init_card; 382 host->mmc_host_ops.execute_tuning = xenon_execute_tuning; 383 host->mmc_host_ops.enable_sdio_irq = xenon_enable_sdio_irq; 384 } 385 386 /* 387 * Parse Xenon specific DT properties: 388 * sdhc-id: the index of current SDHC. 389 * Refer to XENON_SYS_CFG_INFO register 390 * tun-count: the interval between re-tuning 391 */ 392 static int xenon_probe_dt(struct platform_device *pdev) 393 { 394 struct device_node *np = pdev->dev.of_node; 395 struct sdhci_host *host = platform_get_drvdata(pdev); 396 struct mmc_host *mmc = host->mmc; 397 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 398 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); 399 u32 sdhc_id, nr_sdhc; 400 u32 tuning_count; 401 402 /* Disable HS200 on Armada AP806 */ 403 if (of_device_is_compatible(np, "marvell,armada-ap806-sdhci")) 404 host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200; 405 406 sdhc_id = 0x0; 407 if (!of_property_read_u32(np, "marvell,xenon-sdhc-id", &sdhc_id)) { 408 nr_sdhc = sdhci_readl(host, XENON_SYS_CFG_INFO); 409 nr_sdhc &= XENON_NR_SUPPORTED_SLOT_MASK; 410 if (unlikely(sdhc_id > nr_sdhc)) { 411 dev_err(mmc_dev(mmc), "SDHC Index %d exceeds Number of SDHCs %d\n", 412 sdhc_id, nr_sdhc); 413 return -EINVAL; 414 } 415 } 416 priv->sdhc_id = sdhc_id; 417 418 tuning_count = XENON_DEF_TUNING_COUNT; 419 if (!of_property_read_u32(np, "marvell,xenon-tun-count", 420 &tuning_count)) { 421 if (unlikely(tuning_count >= XENON_TMR_RETUN_NO_PRESENT)) { 422 dev_err(mmc_dev(mmc), "Wrong Re-tuning Count. Set default value %d\n", 423 XENON_DEF_TUNING_COUNT); 424 tuning_count = XENON_DEF_TUNING_COUNT; 425 } 426 } 427 priv->tuning_count = tuning_count; 428 429 return xenon_phy_parse_dt(np, host); 430 } 431 432 static int xenon_sdhc_prepare(struct sdhci_host *host) 433 { 434 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 435 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); 436 u8 sdhc_id = priv->sdhc_id; 437 438 /* Enable SDHC */ 439 xenon_enable_sdhc(host, sdhc_id); 440 441 /* Enable ACG */ 442 xenon_set_acg(host, true); 443 444 /* Enable Parallel Transfer Mode */ 445 xenon_enable_sdhc_parallel_tran(host, sdhc_id); 446 447 /* Disable SDCLK-Off-While-Idle before card init */ 448 xenon_set_sdclk_off_idle(host, sdhc_id, false); 449 450 xenon_mask_cmd_conflict_err(host); 451 452 return 0; 453 } 454 455 static void xenon_sdhc_unprepare(struct sdhci_host *host) 456 { 457 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 458 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); 459 u8 sdhc_id = priv->sdhc_id; 460 461 /* disable SDHC */ 462 xenon_disable_sdhc(host, sdhc_id); 463 } 464 465 static int xenon_probe(struct platform_device *pdev) 466 { 467 struct sdhci_pltfm_host *pltfm_host; 468 struct sdhci_host *host; 469 struct xenon_priv *priv; 470 int err; 471 472 host = sdhci_pltfm_init(pdev, &sdhci_xenon_pdata, 473 sizeof(struct xenon_priv)); 474 if (IS_ERR(host)) 475 return PTR_ERR(host); 476 477 pltfm_host = sdhci_priv(host); 478 priv = sdhci_pltfm_priv(pltfm_host); 479 480 /* 481 * Link Xenon specific mmc_host_ops function, 482 * to replace standard ones in sdhci_ops. 483 */ 484 xenon_replace_mmc_host_ops(host); 485 486 pltfm_host->clk = devm_clk_get(&pdev->dev, "core"); 487 if (IS_ERR(pltfm_host->clk)) { 488 err = PTR_ERR(pltfm_host->clk); 489 dev_err(&pdev->dev, "Failed to setup input clk: %d\n", err); 490 goto free_pltfm; 491 } 492 err = clk_prepare_enable(pltfm_host->clk); 493 if (err) 494 goto free_pltfm; 495 496 priv->axi_clk = devm_clk_get(&pdev->dev, "axi"); 497 if (IS_ERR(priv->axi_clk)) { 498 err = PTR_ERR(priv->axi_clk); 499 if (err == -EPROBE_DEFER) 500 goto err_clk; 501 } else { 502 err = clk_prepare_enable(priv->axi_clk); 503 if (err) 504 goto err_clk; 505 } 506 507 err = mmc_of_parse(host->mmc); 508 if (err) 509 goto err_clk_axi; 510 511 sdhci_get_of_property(pdev); 512 513 xenon_set_acg(host, false); 514 515 /* Xenon specific dt parse */ 516 err = xenon_probe_dt(pdev); 517 if (err) 518 goto err_clk_axi; 519 520 err = xenon_sdhc_prepare(host); 521 if (err) 522 goto err_clk_axi; 523 524 pm_runtime_get_noresume(&pdev->dev); 525 pm_runtime_set_active(&pdev->dev); 526 pm_runtime_set_autosuspend_delay(&pdev->dev, 50); 527 pm_runtime_use_autosuspend(&pdev->dev); 528 pm_runtime_enable(&pdev->dev); 529 pm_suspend_ignore_children(&pdev->dev, 1); 530 531 err = sdhci_add_host(host); 532 if (err) 533 goto remove_sdhc; 534 535 pm_runtime_put_autosuspend(&pdev->dev); 536 537 return 0; 538 539 remove_sdhc: 540 pm_runtime_disable(&pdev->dev); 541 pm_runtime_put_noidle(&pdev->dev); 542 xenon_sdhc_unprepare(host); 543 err_clk_axi: 544 clk_disable_unprepare(priv->axi_clk); 545 err_clk: 546 clk_disable_unprepare(pltfm_host->clk); 547 free_pltfm: 548 sdhci_pltfm_free(pdev); 549 return err; 550 } 551 552 static int xenon_remove(struct platform_device *pdev) 553 { 554 struct sdhci_host *host = platform_get_drvdata(pdev); 555 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 556 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); 557 558 pm_runtime_get_sync(&pdev->dev); 559 pm_runtime_disable(&pdev->dev); 560 pm_runtime_put_noidle(&pdev->dev); 561 562 sdhci_remove_host(host, 0); 563 564 xenon_sdhc_unprepare(host); 565 clk_disable_unprepare(priv->axi_clk); 566 clk_disable_unprepare(pltfm_host->clk); 567 568 sdhci_pltfm_free(pdev); 569 570 return 0; 571 } 572 573 #ifdef CONFIG_PM_SLEEP 574 static int xenon_suspend(struct device *dev) 575 { 576 struct sdhci_host *host = dev_get_drvdata(dev); 577 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 578 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); 579 int ret; 580 581 ret = pm_runtime_force_suspend(dev); 582 583 priv->restore_needed = true; 584 return ret; 585 } 586 #endif 587 588 #ifdef CONFIG_PM 589 static int xenon_runtime_suspend(struct device *dev) 590 { 591 struct sdhci_host *host = dev_get_drvdata(dev); 592 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 593 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); 594 int ret; 595 596 ret = sdhci_runtime_suspend_host(host); 597 if (ret) 598 return ret; 599 600 if (host->tuning_mode != SDHCI_TUNING_MODE_3) 601 mmc_retune_needed(host->mmc); 602 603 clk_disable_unprepare(pltfm_host->clk); 604 /* 605 * Need to update the priv->clock here, or when runtime resume 606 * back, phy don't aware the clock change and won't adjust phy 607 * which will cause cmd err 608 */ 609 priv->clock = 0; 610 return 0; 611 } 612 613 static int xenon_runtime_resume(struct device *dev) 614 { 615 struct sdhci_host *host = dev_get_drvdata(dev); 616 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 617 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); 618 int ret; 619 620 ret = clk_prepare_enable(pltfm_host->clk); 621 if (ret) { 622 dev_err(dev, "can't enable mainck\n"); 623 return ret; 624 } 625 626 if (priv->restore_needed) { 627 ret = xenon_sdhc_prepare(host); 628 if (ret) 629 goto out; 630 priv->restore_needed = false; 631 } 632 633 ret = sdhci_runtime_resume_host(host); 634 if (ret) 635 goto out; 636 return 0; 637 out: 638 clk_disable_unprepare(pltfm_host->clk); 639 return ret; 640 } 641 #endif /* CONFIG_PM */ 642 643 static const struct dev_pm_ops sdhci_xenon_dev_pm_ops = { 644 SET_SYSTEM_SLEEP_PM_OPS(xenon_suspend, 645 pm_runtime_force_resume) 646 SET_RUNTIME_PM_OPS(xenon_runtime_suspend, 647 xenon_runtime_resume, 648 NULL) 649 }; 650 651 static const struct of_device_id sdhci_xenon_dt_ids[] = { 652 { .compatible = "marvell,armada-ap806-sdhci",}, 653 { .compatible = "marvell,armada-cp110-sdhci",}, 654 { .compatible = "marvell,armada-3700-sdhci",}, 655 {} 656 }; 657 MODULE_DEVICE_TABLE(of, sdhci_xenon_dt_ids); 658 659 static struct platform_driver sdhci_xenon_driver = { 660 .driver = { 661 .name = "xenon-sdhci", 662 .of_match_table = sdhci_xenon_dt_ids, 663 .pm = &sdhci_xenon_dev_pm_ops, 664 }, 665 .probe = xenon_probe, 666 .remove = xenon_remove, 667 }; 668 669 module_platform_driver(sdhci_xenon_driver); 670 671 MODULE_DESCRIPTION("SDHCI platform driver for Marvell Xenon SDHC"); 672 MODULE_AUTHOR("Hu Ziji <huziji@marvell.com>"); 673 MODULE_LICENSE("GPL v2"); 674