1 // SPDX-License-Identifier: GPL-2.0-only
2 /* linux/drivers/mmc/host/sdhci-s3c.c
4 * Copyright 2008 Openmoko Inc.
5 * Copyright 2008 Simtec Electronics
6 * Ben Dooks <ben@simtec.co.uk>
7 * http://armlinux.simtec.co.uk/
9 * SDHCI (HSMMC) support for Samsung SoC
12 #include <linux/spinlock.h>
13 #include <linux/delay.h>
14 #include <linux/dma-mapping.h>
15 #include <linux/platform_device.h>
16 #include <linux/platform_data/mmc-sdhci-s3c.h>
17 #include <linux/slab.h>
18 #include <linux/clk.h>
20 #include <linux/gpio.h>
21 #include <linux/module.h>
23 #include <linux/of_gpio.h>
25 #include <linux/pm_runtime.h>
27 #include <linux/mmc/host.h>
31 #define MAX_BUS_CLK (4)
33 #define S3C_SDHCI_CONTROL2 (0x80)
34 #define S3C_SDHCI_CONTROL3 (0x84)
35 #define S3C64XX_SDHCI_CONTROL4 (0x8C)
37 #define S3C64XX_SDHCI_CTRL2_ENSTAASYNCCLR BIT(31)
38 #define S3C64XX_SDHCI_CTRL2_ENCMDCNFMSK BIT(30)
39 #define S3C_SDHCI_CTRL2_CDINVRXD3 BIT(29)
40 #define S3C_SDHCI_CTRL2_SLCARDOUT BIT(28)
42 #define S3C_SDHCI_CTRL2_FLTCLKSEL_MASK (0xf << 24)
43 #define S3C_SDHCI_CTRL2_FLTCLKSEL_SHIFT (24)
44 #define S3C_SDHCI_CTRL2_FLTCLKSEL(_x) ((_x) << 24)
46 #define S3C_SDHCI_CTRL2_LVLDAT_MASK (0xff << 16)
47 #define S3C_SDHCI_CTRL2_LVLDAT_SHIFT (16)
48 #define S3C_SDHCI_CTRL2_LVLDAT(_x) ((_x) << 16)
50 #define S3C_SDHCI_CTRL2_ENFBCLKTX BIT(15)
51 #define S3C_SDHCI_CTRL2_ENFBCLKRX BIT(14)
52 #define S3C_SDHCI_CTRL2_SDCDSEL BIT(13)
53 #define S3C_SDHCI_CTRL2_SDSIGPC BIT(12)
54 #define S3C_SDHCI_CTRL2_ENBUSYCHKTXSTART BIT(11)
56 #define S3C_SDHCI_CTRL2_DFCNT_MASK (0x3 << 9)
57 #define S3C_SDHCI_CTRL2_DFCNT_SHIFT (9)
58 #define S3C_SDHCI_CTRL2_DFCNT_NONE (0x0 << 9)
59 #define S3C_SDHCI_CTRL2_DFCNT_4SDCLK (0x1 << 9)
60 #define S3C_SDHCI_CTRL2_DFCNT_16SDCLK (0x2 << 9)
61 #define S3C_SDHCI_CTRL2_DFCNT_64SDCLK (0x3 << 9)
63 #define S3C_SDHCI_CTRL2_ENCLKOUTHOLD BIT(8)
64 #define S3C_SDHCI_CTRL2_RWAITMODE BIT(7)
65 #define S3C_SDHCI_CTRL2_DISBUFRD BIT(6)
67 #define S3C_SDHCI_CTRL2_SELBASECLK_MASK (0x3 << 4)
68 #define S3C_SDHCI_CTRL2_SELBASECLK_SHIFT (4)
69 #define S3C_SDHCI_CTRL2_PWRSYNC BIT(3)
70 #define S3C_SDHCI_CTRL2_ENCLKOUTMSKCON BIT(1)
71 #define S3C_SDHCI_CTRL2_HWINITFIN BIT(0)
73 #define S3C_SDHCI_CTRL3_FCSEL3 BIT(31)
74 #define S3C_SDHCI_CTRL3_FCSEL2 BIT(23)
75 #define S3C_SDHCI_CTRL3_FCSEL1 BIT(15)
76 #define S3C_SDHCI_CTRL3_FCSEL0 BIT(7)
78 #define S3C_SDHCI_CTRL3_FIA3_MASK (0x7f << 24)
79 #define S3C_SDHCI_CTRL3_FIA3_SHIFT (24)
80 #define S3C_SDHCI_CTRL3_FIA3(_x) ((_x) << 24)
82 #define S3C_SDHCI_CTRL3_FIA2_MASK (0x7f << 16)
83 #define S3C_SDHCI_CTRL3_FIA2_SHIFT (16)
84 #define S3C_SDHCI_CTRL3_FIA2(_x) ((_x) << 16)
86 #define S3C_SDHCI_CTRL3_FIA1_MASK (0x7f << 8)
87 #define S3C_SDHCI_CTRL3_FIA1_SHIFT (8)
88 #define S3C_SDHCI_CTRL3_FIA1(_x) ((_x) << 8)
90 #define S3C_SDHCI_CTRL3_FIA0_MASK (0x7f << 0)
91 #define S3C_SDHCI_CTRL3_FIA0_SHIFT (0)
92 #define S3C_SDHCI_CTRL3_FIA0(_x) ((_x) << 0)
94 #define S3C64XX_SDHCI_CONTROL4_DRIVE_MASK (0x3 << 16)
95 #define S3C64XX_SDHCI_CONTROL4_DRIVE_SHIFT (16)
96 #define S3C64XX_SDHCI_CONTROL4_DRIVE_2mA (0x0 << 16)
97 #define S3C64XX_SDHCI_CONTROL4_DRIVE_4mA (0x1 << 16)
98 #define S3C64XX_SDHCI_CONTROL4_DRIVE_7mA (0x2 << 16)
99 #define S3C64XX_SDHCI_CONTROL4_DRIVE_9mA (0x3 << 16)
101 #define S3C64XX_SDHCI_CONTROL4_BUSY (1)
104 * struct sdhci_s3c - S3C SDHCI instance
105 * @host: The SDHCI host created
106 * @pdev: The platform device we where created from.
107 * @ioarea: The resource created when we claimed the IO area.
108 * @pdata: The platform data for this controller.
109 * @cur_clk: The index of the current bus clock.
110 * @ext_cd_irq: External card detect interrupt.
111 * @clk_io: The clock for the internal bus interface.
112 * @clk_rates: Clock frequencies.
113 * @clk_bus: The clocks that are available for the SD/MMC bus clock.
114 * @no_divider: No or non-standard internal clock divider.
117 struct sdhci_host *host;
118 struct platform_device *pdev;
119 struct resource *ioarea;
120 struct s3c_sdhci_platdata *pdata;
125 struct clk *clk_bus[MAX_BUS_CLK];
126 unsigned long clk_rates[MAX_BUS_CLK];
132 * struct sdhci_s3c_driver_data - S3C SDHCI platform specific driver data
133 * @sdhci_quirks: sdhci host specific quirks.
134 * @no_divider: no or non-standard internal clock divider.
136 * Specifies platform specific configuration of sdhci controller.
137 * Note: A structure for driver specific platform data is used for future
138 * expansion of its usage.
140 struct sdhci_s3c_drv_data {
141 unsigned int sdhci_quirks;
145 static inline struct sdhci_s3c *to_s3c(struct sdhci_host *host)
147 return sdhci_priv(host);
151 * sdhci_s3c_get_max_clk - callback to get maximum clock frequency.
152 * @host: The SDHCI host instance.
154 * Callback to return the maximum clock rate acheivable by the controller.
156 static unsigned int sdhci_s3c_get_max_clk(struct sdhci_host *host)
158 struct sdhci_s3c *ourhost = to_s3c(host);
159 unsigned long rate, max = 0;
162 for (src = 0; src < MAX_BUS_CLK; src++) {
163 rate = ourhost->clk_rates[src];
172 * sdhci_s3c_consider_clock - consider one the bus clocks for current setting
173 * @ourhost: Our SDHCI instance.
174 * @src: The source clock index.
175 * @wanted: The clock frequency wanted.
177 static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost,
182 struct clk *clksrc = ourhost->clk_bus[src];
189 * If controller uses a non-standard clock division, find the best clock
190 * speed possible with selected clock source and skip the division.
192 if (ourhost->no_divider) {
193 rate = clk_round_rate(clksrc, wanted);
194 return wanted - rate;
197 rate = ourhost->clk_rates[src];
199 for (shift = 0; shift <= 8; ++shift) {
200 if ((rate >> shift) <= wanted)
205 dev_dbg(&ourhost->pdev->dev,
206 "clk %d: rate %ld, min rate %lu > wanted %u\n",
207 src, rate, rate / 256, wanted);
211 dev_dbg(&ourhost->pdev->dev, "clk %d: rate %ld, want %d, got %ld\n",
212 src, rate, wanted, rate >> shift);
214 return wanted - (rate >> shift);
218 * sdhci_s3c_set_clock - callback on clock change
219 * @host: The SDHCI host being changed
220 * @clock: The clock rate being requested.
222 * When the card's clock is going to be changed, look at the new frequency
223 * and find the best clock source to go with it.
225 static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
227 struct sdhci_s3c *ourhost = to_s3c(host);
228 unsigned int best = UINT_MAX;
234 host->mmc->actual_clock = 0;
236 /* don't bother if the clock is going off. */
238 sdhci_set_clock(host, clock);
242 for (src = 0; src < MAX_BUS_CLK; src++) {
243 delta = sdhci_s3c_consider_clock(ourhost, src, clock);
250 dev_dbg(&ourhost->pdev->dev,
251 "selected source %d, clock %d, delta %d\n",
252 best_src, clock, best);
254 /* select the new clock source */
255 if (ourhost->cur_clk != best_src) {
256 struct clk *clk = ourhost->clk_bus[best_src];
258 clk_prepare_enable(clk);
259 if (ourhost->cur_clk >= 0)
260 clk_disable_unprepare(
261 ourhost->clk_bus[ourhost->cur_clk]);
263 ourhost->cur_clk = best_src;
264 host->max_clk = ourhost->clk_rates[best_src];
267 /* turn clock off to card before changing clock source */
268 writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
270 ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
271 ctrl &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK;
272 ctrl |= best_src << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;
273 writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);
275 /* reprogram default hardware configuration */
276 writel(S3C64XX_SDHCI_CONTROL4_DRIVE_9mA,
277 host->ioaddr + S3C64XX_SDHCI_CONTROL4);
279 ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
280 ctrl |= (S3C64XX_SDHCI_CTRL2_ENSTAASYNCCLR |
281 S3C64XX_SDHCI_CTRL2_ENCMDCNFMSK |
282 S3C_SDHCI_CTRL2_ENFBCLKRX |
283 S3C_SDHCI_CTRL2_DFCNT_NONE |
284 S3C_SDHCI_CTRL2_ENCLKOUTHOLD);
285 writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);
287 /* reconfigure the controller for new clock rate */
288 ctrl = (S3C_SDHCI_CTRL3_FCSEL1 | S3C_SDHCI_CTRL3_FCSEL0);
289 if (clock < 25 * 1000000)
290 ctrl |= (S3C_SDHCI_CTRL3_FCSEL3 | S3C_SDHCI_CTRL3_FCSEL2);
291 writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL3);
293 sdhci_set_clock(host, clock);
297 * sdhci_s3c_get_min_clock - callback to get minimal supported clock value
298 * @host: The SDHCI host being queried
300 * To init mmc host properly a minimal clock value is needed. For high system
301 * bus clock's values the standard formula gives values out of allowed range.
302 * The clock still can be set to lower values, if clock source other then
303 * system bus is selected.
305 static unsigned int sdhci_s3c_get_min_clock(struct sdhci_host *host)
307 struct sdhci_s3c *ourhost = to_s3c(host);
308 unsigned long rate, min = ULONG_MAX;
311 for (src = 0; src < MAX_BUS_CLK; src++) {
312 rate = ourhost->clk_rates[src] / 256;
322 /* sdhci_cmu_get_max_clk - callback to get maximum clock frequency.*/
323 static unsigned int sdhci_cmu_get_max_clock(struct sdhci_host *host)
325 struct sdhci_s3c *ourhost = to_s3c(host);
326 unsigned long rate, max = 0;
329 for (src = 0; src < MAX_BUS_CLK; src++) {
332 clk = ourhost->clk_bus[src];
336 rate = clk_round_rate(clk, ULONG_MAX);
344 /* sdhci_cmu_get_min_clock - callback to get minimal supported clock value. */
345 static unsigned int sdhci_cmu_get_min_clock(struct sdhci_host *host)
347 struct sdhci_s3c *ourhost = to_s3c(host);
348 unsigned long rate, min = ULONG_MAX;
351 for (src = 0; src < MAX_BUS_CLK; src++) {
354 clk = ourhost->clk_bus[src];
358 rate = clk_round_rate(clk, 0);
366 /* sdhci_cmu_set_clock - callback on clock change.*/
367 static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock)
369 struct sdhci_s3c *ourhost = to_s3c(host);
370 struct device *dev = &ourhost->pdev->dev;
371 unsigned long timeout;
375 host->mmc->actual_clock = 0;
377 /* If the clock is going off, set to 0 at clock control register */
379 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
383 sdhci_s3c_set_clock(host, clock);
385 /* Reset SD Clock Enable */
386 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
387 clk &= ~SDHCI_CLOCK_CARD_EN;
388 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
390 ret = clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);
392 dev_err(dev, "%s: failed to set clock rate %uHz\n",
393 mmc_hostname(host->mmc), clock);
397 clk = SDHCI_CLOCK_INT_EN;
398 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
402 while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
403 & SDHCI_CLOCK_INT_STABLE)) {
405 dev_err(dev, "%s: Internal clock never stabilised.\n",
406 mmc_hostname(host->mmc));
413 clk |= SDHCI_CLOCK_CARD_EN;
414 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
417 static struct sdhci_ops sdhci_s3c_ops = {
418 .get_max_clock = sdhci_s3c_get_max_clk,
419 .set_clock = sdhci_s3c_set_clock,
420 .get_min_clock = sdhci_s3c_get_min_clock,
421 .set_bus_width = sdhci_set_bus_width,
422 .reset = sdhci_reset,
423 .set_uhs_signaling = sdhci_set_uhs_signaling,
427 static int sdhci_s3c_parse_dt(struct device *dev,
428 struct sdhci_host *host, struct s3c_sdhci_platdata *pdata)
430 struct device_node *node = dev->of_node;
433 /* if the bus-width property is not specified, assume width as 1 */
434 if (of_property_read_u32(node, "bus-width", &max_width))
436 pdata->max_width = max_width;
438 /* get the card detection method */
439 if (of_get_property(node, "broken-cd", NULL)) {
440 pdata->cd_type = S3C_SDHCI_CD_NONE;
444 if (of_get_property(node, "non-removable", NULL)) {
445 pdata->cd_type = S3C_SDHCI_CD_PERMANENT;
449 if (of_get_named_gpio(node, "cd-gpios", 0))
452 /* assuming internal card detect that will be configured by pinctrl */
453 pdata->cd_type = S3C_SDHCI_CD_INTERNAL;
457 static int sdhci_s3c_parse_dt(struct device *dev,
458 struct sdhci_host *host, struct s3c_sdhci_platdata *pdata)
464 static const struct of_device_id sdhci_s3c_dt_match[];
466 static inline struct sdhci_s3c_drv_data *sdhci_s3c_get_driver_data(
467 struct platform_device *pdev)
470 if (pdev->dev.of_node) {
471 const struct of_device_id *match;
472 match = of_match_node(sdhci_s3c_dt_match, pdev->dev.of_node);
473 return (struct sdhci_s3c_drv_data *)match->data;
476 return (struct sdhci_s3c_drv_data *)
477 platform_get_device_id(pdev)->driver_data;
480 static int sdhci_s3c_probe(struct platform_device *pdev)
482 struct s3c_sdhci_platdata *pdata;
483 struct sdhci_s3c_drv_data *drv_data;
484 struct device *dev = &pdev->dev;
485 struct sdhci_host *host;
486 struct sdhci_s3c *sc;
487 int ret, irq, ptr, clks;
489 if (!pdev->dev.platform_data && !pdev->dev.of_node) {
490 dev_err(dev, "no device data specified\n");
494 irq = platform_get_irq(pdev, 0);
498 host = sdhci_alloc_host(dev, sizeof(struct sdhci_s3c));
500 dev_err(dev, "sdhci_alloc_host() failed\n");
501 return PTR_ERR(host);
503 sc = sdhci_priv(host);
505 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
508 goto err_pdata_io_clk;
511 if (pdev->dev.of_node) {
512 ret = sdhci_s3c_parse_dt(&pdev->dev, host, pdata);
514 goto err_pdata_io_clk;
516 memcpy(pdata, pdev->dev.platform_data, sizeof(*pdata));
519 drv_data = sdhci_s3c_get_driver_data(pdev);
526 platform_set_drvdata(pdev, host);
528 sc->clk_io = devm_clk_get(dev, "hsmmc");
529 if (IS_ERR(sc->clk_io)) {
530 dev_err(dev, "failed to get io clock\n");
531 ret = PTR_ERR(sc->clk_io);
532 goto err_pdata_io_clk;
535 /* enable the local io clock and keep it running for the moment. */
536 clk_prepare_enable(sc->clk_io);
538 for (clks = 0, ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
541 snprintf(name, 14, "mmc_busclk.%d", ptr);
542 sc->clk_bus[ptr] = devm_clk_get(dev, name);
543 if (IS_ERR(sc->clk_bus[ptr]))
547 sc->clk_rates[ptr] = clk_get_rate(sc->clk_bus[ptr]);
549 dev_info(dev, "clock source %d: %s (%ld Hz)\n",
550 ptr, name, sc->clk_rates[ptr]);
554 dev_err(dev, "failed to find any bus clocks\n");
559 host->ioaddr = devm_platform_ioremap_resource(pdev, 0);
560 if (IS_ERR(host->ioaddr)) {
561 ret = PTR_ERR(host->ioaddr);
565 /* Ensure we have minimal gpio selected CMD/CLK/Detect */
567 pdata->cfg_gpio(pdev, pdata->max_width);
569 host->hw_name = "samsung-hsmmc";
570 host->ops = &sdhci_s3c_ops;
575 /* Setup quirks for the controller */
576 host->quirks |= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC;
577 host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
579 host->quirks |= drv_data->sdhci_quirks;
580 sc->no_divider = drv_data->no_divider;
583 #ifndef CONFIG_MMC_SDHCI_S3C_DMA
585 /* we currently see overruns on errors, so disable the SDMA
586 * support as well. */
587 host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
589 #endif /* CONFIG_MMC_SDHCI_S3C_DMA */
591 /* It seems we do not get an DATA transfer complete on non-busy
592 * transfers, not sure if this is a problem with this specific
593 * SDHCI block, or a missing configuration that needs to be set. */
594 host->quirks |= SDHCI_QUIRK_NO_BUSY_IRQ;
596 /* This host supports the Auto CMD12 */
597 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
599 /* Samsung SoCs need BROKEN_ADMA_ZEROLEN_DESC */
600 host->quirks |= SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC;
602 if (pdata->cd_type == S3C_SDHCI_CD_NONE ||
603 pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
604 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
606 if (pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
607 host->mmc->caps = MMC_CAP_NONREMOVABLE;
609 switch (pdata->max_width) {
611 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
614 host->mmc->caps |= MMC_CAP_4_BIT_DATA;
619 host->mmc->pm_caps |= pdata->pm_caps;
621 host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR |
622 SDHCI_QUIRK_32BIT_DMA_SIZE);
624 /* HSMMC on Samsung SoCs uses SDCLK as timeout clock */
625 host->quirks |= SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK;
628 * If controller does not have internal clock divider,
629 * we can use overriding functions instead of default.
631 if (sc->no_divider) {
632 sdhci_s3c_ops.set_clock = sdhci_cmu_set_clock;
633 sdhci_s3c_ops.get_min_clock = sdhci_cmu_get_min_clock;
634 sdhci_s3c_ops.get_max_clock = sdhci_cmu_get_max_clock;
637 /* It supports additional host capabilities if needed */
638 if (pdata->host_caps)
639 host->mmc->caps |= pdata->host_caps;
641 if (pdata->host_caps2)
642 host->mmc->caps2 |= pdata->host_caps2;
644 pm_runtime_enable(&pdev->dev);
645 pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
646 pm_runtime_use_autosuspend(&pdev->dev);
647 pm_suspend_ignore_children(&pdev->dev, 1);
649 ret = mmc_of_parse(host->mmc);
653 ret = sdhci_add_host(host);
658 if (pdata->cd_type != S3C_SDHCI_CD_INTERNAL)
659 clk_disable_unprepare(sc->clk_io);
664 pm_runtime_disable(&pdev->dev);
667 clk_disable_unprepare(sc->clk_io);
670 sdhci_free_host(host);
675 static int sdhci_s3c_remove(struct platform_device *pdev)
677 struct sdhci_host *host = platform_get_drvdata(pdev);
678 struct sdhci_s3c *sc = sdhci_priv(host);
681 free_irq(sc->ext_cd_irq, sc);
684 if (sc->pdata->cd_type != S3C_SDHCI_CD_INTERNAL)
685 clk_prepare_enable(sc->clk_io);
687 sdhci_remove_host(host, 1);
689 pm_runtime_dont_use_autosuspend(&pdev->dev);
690 pm_runtime_disable(&pdev->dev);
692 clk_disable_unprepare(sc->clk_io);
694 sdhci_free_host(host);
699 #ifdef CONFIG_PM_SLEEP
700 static int sdhci_s3c_suspend(struct device *dev)
702 struct sdhci_host *host = dev_get_drvdata(dev);
704 if (host->tuning_mode != SDHCI_TUNING_MODE_3)
705 mmc_retune_needed(host->mmc);
707 return sdhci_suspend_host(host);
710 static int sdhci_s3c_resume(struct device *dev)
712 struct sdhci_host *host = dev_get_drvdata(dev);
714 return sdhci_resume_host(host);
719 static int sdhci_s3c_runtime_suspend(struct device *dev)
721 struct sdhci_host *host = dev_get_drvdata(dev);
722 struct sdhci_s3c *ourhost = to_s3c(host);
723 struct clk *busclk = ourhost->clk_io;
726 ret = sdhci_runtime_suspend_host(host);
728 if (host->tuning_mode != SDHCI_TUNING_MODE_3)
729 mmc_retune_needed(host->mmc);
731 if (ourhost->cur_clk >= 0)
732 clk_disable_unprepare(ourhost->clk_bus[ourhost->cur_clk]);
733 clk_disable_unprepare(busclk);
737 static int sdhci_s3c_runtime_resume(struct device *dev)
739 struct sdhci_host *host = dev_get_drvdata(dev);
740 struct sdhci_s3c *ourhost = to_s3c(host);
741 struct clk *busclk = ourhost->clk_io;
744 clk_prepare_enable(busclk);
745 if (ourhost->cur_clk >= 0)
746 clk_prepare_enable(ourhost->clk_bus[ourhost->cur_clk]);
747 ret = sdhci_runtime_resume_host(host, 0);
752 static const struct dev_pm_ops sdhci_s3c_pmops = {
753 SET_SYSTEM_SLEEP_PM_OPS(sdhci_s3c_suspend, sdhci_s3c_resume)
754 SET_RUNTIME_PM_OPS(sdhci_s3c_runtime_suspend, sdhci_s3c_runtime_resume,
758 static const struct platform_device_id sdhci_s3c_driver_ids[] = {
761 .driver_data = (kernel_ulong_t)NULL,
765 MODULE_DEVICE_TABLE(platform, sdhci_s3c_driver_ids);
768 static struct sdhci_s3c_drv_data exynos4_sdhci_drv_data = {
772 static const struct of_device_id sdhci_s3c_dt_match[] = {
773 { .compatible = "samsung,s3c6410-sdhci", },
774 { .compatible = "samsung,exynos4210-sdhci",
775 .data = &exynos4_sdhci_drv_data },
778 MODULE_DEVICE_TABLE(of, sdhci_s3c_dt_match);
781 static struct platform_driver sdhci_s3c_driver = {
782 .probe = sdhci_s3c_probe,
783 .remove = sdhci_s3c_remove,
784 .id_table = sdhci_s3c_driver_ids,
787 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
788 .of_match_table = of_match_ptr(sdhci_s3c_dt_match),
789 .pm = &sdhci_s3c_pmops,
793 module_platform_driver(sdhci_s3c_driver);
795 MODULE_DESCRIPTION("Samsung SDHCI (HSMMC) glue");
796 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
797 MODULE_LICENSE("GPL v2");
798 MODULE_ALIAS("platform:s3c-sdhci");