xref: /linux/drivers/mmc/host/sdhci-s3c.c (revision f86fd32d) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* linux/drivers/mmc/host/sdhci-s3c.c
3  *
4  * Copyright 2008 Openmoko Inc.
5  * Copyright 2008 Simtec Electronics
6  *      Ben Dooks <ben@simtec.co.uk>
7  *      http://armlinux.simtec.co.uk/
8  *
9  * SDHCI (HSMMC) support for Samsung SoC
10  */
11 
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>
19 #include <linux/io.h>
20 #include <linux/gpio.h>
21 #include <linux/module.h>
22 #include <linux/of.h>
23 #include <linux/of_gpio.h>
24 #include <linux/pm.h>
25 #include <linux/pm_runtime.h>
26 
27 #include <linux/mmc/host.h>
28 
29 #include "sdhci.h"
30 
31 #define MAX_BUS_CLK	(4)
32 
33 #define S3C_SDHCI_CONTROL2			(0x80)
34 #define S3C_SDHCI_CONTROL3			(0x84)
35 #define S3C64XX_SDHCI_CONTROL4			(0x8C)
36 
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)
41 
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)
45 
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)
49 
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)
55 
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)
62 
63 #define S3C_SDHCI_CTRL2_ENCLKOUTHOLD		BIT(8)
64 #define S3C_SDHCI_CTRL2_RWAITMODE		BIT(7)
65 #define S3C_SDHCI_CTRL2_DISBUFRD		BIT(6)
66 
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)
72 
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)
77 
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)
81 
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)
85 
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)
89 
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)
93 
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)
100 
101 #define S3C64XX_SDHCI_CONTROL4_BUSY		(1)
102 
103 /**
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  * @clk_io: The clock for the internal bus interface.
111  * @clk_bus: The clocks that are available for the SD/MMC bus clock.
112  */
113 struct sdhci_s3c {
114 	struct sdhci_host	*host;
115 	struct platform_device	*pdev;
116 	struct resource		*ioarea;
117 	struct s3c_sdhci_platdata *pdata;
118 	int			cur_clk;
119 	int			ext_cd_irq;
120 
121 	struct clk		*clk_io;
122 	struct clk		*clk_bus[MAX_BUS_CLK];
123 	unsigned long		clk_rates[MAX_BUS_CLK];
124 
125 	bool			no_divider;
126 };
127 
128 /**
129  * struct sdhci_s3c_driver_data - S3C SDHCI platform specific driver data
130  * @sdhci_quirks: sdhci host specific quirks.
131  *
132  * Specifies platform specific configuration of sdhci controller.
133  * Note: A structure for driver specific platform data is used for future
134  * expansion of its usage.
135  */
136 struct sdhci_s3c_drv_data {
137 	unsigned int	sdhci_quirks;
138 	bool		no_divider;
139 };
140 
141 static inline struct sdhci_s3c *to_s3c(struct sdhci_host *host)
142 {
143 	return sdhci_priv(host);
144 }
145 
146 /**
147  * sdhci_s3c_get_max_clk - callback to get maximum clock frequency.
148  * @host: The SDHCI host instance.
149  *
150  * Callback to return the maximum clock rate acheivable by the controller.
151 */
152 static unsigned int sdhci_s3c_get_max_clk(struct sdhci_host *host)
153 {
154 	struct sdhci_s3c *ourhost = to_s3c(host);
155 	unsigned long rate, max = 0;
156 	int src;
157 
158 	for (src = 0; src < MAX_BUS_CLK; src++) {
159 		rate = ourhost->clk_rates[src];
160 		if (rate > max)
161 			max = rate;
162 	}
163 
164 	return max;
165 }
166 
167 /**
168  * sdhci_s3c_consider_clock - consider one the bus clocks for current setting
169  * @ourhost: Our SDHCI instance.
170  * @src: The source clock index.
171  * @wanted: The clock frequency wanted.
172  */
173 static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost,
174 					     unsigned int src,
175 					     unsigned int wanted)
176 {
177 	unsigned long rate;
178 	struct clk *clksrc = ourhost->clk_bus[src];
179 	int shift;
180 
181 	if (IS_ERR(clksrc))
182 		return UINT_MAX;
183 
184 	/*
185 	 * If controller uses a non-standard clock division, find the best clock
186 	 * speed possible with selected clock source and skip the division.
187 	 */
188 	if (ourhost->no_divider) {
189 		rate = clk_round_rate(clksrc, wanted);
190 		return wanted - rate;
191 	}
192 
193 	rate = ourhost->clk_rates[src];
194 
195 	for (shift = 0; shift <= 8; ++shift) {
196 		if ((rate >> shift) <= wanted)
197 			break;
198 	}
199 
200 	if (shift > 8) {
201 		dev_dbg(&ourhost->pdev->dev,
202 			"clk %d: rate %ld, min rate %lu > wanted %u\n",
203 			src, rate, rate / 256, wanted);
204 		return UINT_MAX;
205 	}
206 
207 	dev_dbg(&ourhost->pdev->dev, "clk %d: rate %ld, want %d, got %ld\n",
208 		src, rate, wanted, rate >> shift);
209 
210 	return wanted - (rate >> shift);
211 }
212 
213 /**
214  * sdhci_s3c_set_clock - callback on clock change
215  * @host: The SDHCI host being changed
216  * @clock: The clock rate being requested.
217  *
218  * When the card's clock is going to be changed, look at the new frequency
219  * and find the best clock source to go with it.
220 */
221 static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
222 {
223 	struct sdhci_s3c *ourhost = to_s3c(host);
224 	unsigned int best = UINT_MAX;
225 	unsigned int delta;
226 	int best_src = 0;
227 	int src;
228 	u32 ctrl;
229 
230 	host->mmc->actual_clock = 0;
231 
232 	/* don't bother if the clock is going off. */
233 	if (clock == 0) {
234 		sdhci_set_clock(host, clock);
235 		return;
236 	}
237 
238 	for (src = 0; src < MAX_BUS_CLK; src++) {
239 		delta = sdhci_s3c_consider_clock(ourhost, src, clock);
240 		if (delta < best) {
241 			best = delta;
242 			best_src = src;
243 		}
244 	}
245 
246 	dev_dbg(&ourhost->pdev->dev,
247 		"selected source %d, clock %d, delta %d\n",
248 		 best_src, clock, best);
249 
250 	/* select the new clock source */
251 	if (ourhost->cur_clk != best_src) {
252 		struct clk *clk = ourhost->clk_bus[best_src];
253 
254 		clk_prepare_enable(clk);
255 		if (ourhost->cur_clk >= 0)
256 			clk_disable_unprepare(
257 					ourhost->clk_bus[ourhost->cur_clk]);
258 
259 		ourhost->cur_clk = best_src;
260 		host->max_clk = ourhost->clk_rates[best_src];
261 	}
262 
263 	/* turn clock off to card before changing clock source */
264 	writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
265 
266 	ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
267 	ctrl &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK;
268 	ctrl |= best_src << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;
269 	writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);
270 
271 	/* reprogram default hardware configuration */
272 	writel(S3C64XX_SDHCI_CONTROL4_DRIVE_9mA,
273 		host->ioaddr + S3C64XX_SDHCI_CONTROL4);
274 
275 	ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
276 	ctrl |= (S3C64XX_SDHCI_CTRL2_ENSTAASYNCCLR |
277 		  S3C64XX_SDHCI_CTRL2_ENCMDCNFMSK |
278 		  S3C_SDHCI_CTRL2_ENFBCLKRX |
279 		  S3C_SDHCI_CTRL2_DFCNT_NONE |
280 		  S3C_SDHCI_CTRL2_ENCLKOUTHOLD);
281 	writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);
282 
283 	/* reconfigure the controller for new clock rate */
284 	ctrl = (S3C_SDHCI_CTRL3_FCSEL1 | S3C_SDHCI_CTRL3_FCSEL0);
285 	if (clock < 25 * 1000000)
286 		ctrl |= (S3C_SDHCI_CTRL3_FCSEL3 | S3C_SDHCI_CTRL3_FCSEL2);
287 	writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL3);
288 
289 	sdhci_set_clock(host, clock);
290 }
291 
292 /**
293  * sdhci_s3c_get_min_clock - callback to get minimal supported clock value
294  * @host: The SDHCI host being queried
295  *
296  * To init mmc host properly a minimal clock value is needed. For high system
297  * bus clock's values the standard formula gives values out of allowed range.
298  * The clock still can be set to lower values, if clock source other then
299  * system bus is selected.
300 */
301 static unsigned int sdhci_s3c_get_min_clock(struct sdhci_host *host)
302 {
303 	struct sdhci_s3c *ourhost = to_s3c(host);
304 	unsigned long rate, min = ULONG_MAX;
305 	int src;
306 
307 	for (src = 0; src < MAX_BUS_CLK; src++) {
308 		rate = ourhost->clk_rates[src] / 256;
309 		if (!rate)
310 			continue;
311 		if (rate < min)
312 			min = rate;
313 	}
314 
315 	return min;
316 }
317 
318 /* sdhci_cmu_get_max_clk - callback to get maximum clock frequency.*/
319 static unsigned int sdhci_cmu_get_max_clock(struct sdhci_host *host)
320 {
321 	struct sdhci_s3c *ourhost = to_s3c(host);
322 	unsigned long rate, max = 0;
323 	int src;
324 
325 	for (src = 0; src < MAX_BUS_CLK; src++) {
326 		struct clk *clk;
327 
328 		clk = ourhost->clk_bus[src];
329 		if (IS_ERR(clk))
330 			continue;
331 
332 		rate = clk_round_rate(clk, ULONG_MAX);
333 		if (rate > max)
334 			max = rate;
335 	}
336 
337 	return max;
338 }
339 
340 /* sdhci_cmu_get_min_clock - callback to get minimal supported clock value. */
341 static unsigned int sdhci_cmu_get_min_clock(struct sdhci_host *host)
342 {
343 	struct sdhci_s3c *ourhost = to_s3c(host);
344 	unsigned long rate, min = ULONG_MAX;
345 	int src;
346 
347 	for (src = 0; src < MAX_BUS_CLK; src++) {
348 		struct clk *clk;
349 
350 		clk = ourhost->clk_bus[src];
351 		if (IS_ERR(clk))
352 			continue;
353 
354 		rate = clk_round_rate(clk, 0);
355 		if (rate < min)
356 			min = rate;
357 	}
358 
359 	return min;
360 }
361 
362 /* sdhci_cmu_set_clock - callback on clock change.*/
363 static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock)
364 {
365 	struct sdhci_s3c *ourhost = to_s3c(host);
366 	struct device *dev = &ourhost->pdev->dev;
367 	unsigned long timeout;
368 	u16 clk = 0;
369 	int ret;
370 
371 	host->mmc->actual_clock = 0;
372 
373 	/* If the clock is going off, set to 0 at clock control register */
374 	if (clock == 0) {
375 		sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
376 		return;
377 	}
378 
379 	sdhci_s3c_set_clock(host, clock);
380 
381 	/* Reset SD Clock Enable */
382 	clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
383 	clk &= ~SDHCI_CLOCK_CARD_EN;
384 	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
385 
386 	ret = clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);
387 	if (ret != 0) {
388 		dev_err(dev, "%s: failed to set clock rate %uHz\n",
389 			mmc_hostname(host->mmc), clock);
390 		return;
391 	}
392 
393 	clk = SDHCI_CLOCK_INT_EN;
394 	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
395 
396 	/* Wait max 20 ms */
397 	timeout = 20;
398 	while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
399 		& SDHCI_CLOCK_INT_STABLE)) {
400 		if (timeout == 0) {
401 			dev_err(dev, "%s: Internal clock never stabilised.\n",
402 				mmc_hostname(host->mmc));
403 			return;
404 		}
405 		timeout--;
406 		mdelay(1);
407 	}
408 
409 	clk |= SDHCI_CLOCK_CARD_EN;
410 	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
411 }
412 
413 static struct sdhci_ops sdhci_s3c_ops = {
414 	.get_max_clock		= sdhci_s3c_get_max_clk,
415 	.set_clock		= sdhci_s3c_set_clock,
416 	.get_min_clock		= sdhci_s3c_get_min_clock,
417 	.set_bus_width		= sdhci_set_bus_width,
418 	.reset			= sdhci_reset,
419 	.set_uhs_signaling	= sdhci_set_uhs_signaling,
420 };
421 
422 #ifdef CONFIG_OF
423 static int sdhci_s3c_parse_dt(struct device *dev,
424 		struct sdhci_host *host, struct s3c_sdhci_platdata *pdata)
425 {
426 	struct device_node *node = dev->of_node;
427 	u32 max_width;
428 
429 	/* if the bus-width property is not specified, assume width as 1 */
430 	if (of_property_read_u32(node, "bus-width", &max_width))
431 		max_width = 1;
432 	pdata->max_width = max_width;
433 
434 	/* get the card detection method */
435 	if (of_get_property(node, "broken-cd", NULL)) {
436 		pdata->cd_type = S3C_SDHCI_CD_NONE;
437 		return 0;
438 	}
439 
440 	if (of_get_property(node, "non-removable", NULL)) {
441 		pdata->cd_type = S3C_SDHCI_CD_PERMANENT;
442 		return 0;
443 	}
444 
445 	if (of_get_named_gpio(node, "cd-gpios", 0))
446 		return 0;
447 
448 	/* assuming internal card detect that will be configured by pinctrl */
449 	pdata->cd_type = S3C_SDHCI_CD_INTERNAL;
450 	return 0;
451 }
452 #else
453 static int sdhci_s3c_parse_dt(struct device *dev,
454 		struct sdhci_host *host, struct s3c_sdhci_platdata *pdata)
455 {
456 	return -EINVAL;
457 }
458 #endif
459 
460 static const struct of_device_id sdhci_s3c_dt_match[];
461 
462 static inline struct sdhci_s3c_drv_data *sdhci_s3c_get_driver_data(
463 			struct platform_device *pdev)
464 {
465 #ifdef CONFIG_OF
466 	if (pdev->dev.of_node) {
467 		const struct of_device_id *match;
468 		match = of_match_node(sdhci_s3c_dt_match, pdev->dev.of_node);
469 		return (struct sdhci_s3c_drv_data *)match->data;
470 	}
471 #endif
472 	return (struct sdhci_s3c_drv_data *)
473 			platform_get_device_id(pdev)->driver_data;
474 }
475 
476 static int sdhci_s3c_probe(struct platform_device *pdev)
477 {
478 	struct s3c_sdhci_platdata *pdata;
479 	struct sdhci_s3c_drv_data *drv_data;
480 	struct device *dev = &pdev->dev;
481 	struct sdhci_host *host;
482 	struct sdhci_s3c *sc;
483 	int ret, irq, ptr, clks;
484 
485 	if (!pdev->dev.platform_data && !pdev->dev.of_node) {
486 		dev_err(dev, "no device data specified\n");
487 		return -ENOENT;
488 	}
489 
490 	irq = platform_get_irq(pdev, 0);
491 	if (irq < 0)
492 		return irq;
493 
494 	host = sdhci_alloc_host(dev, sizeof(struct sdhci_s3c));
495 	if (IS_ERR(host)) {
496 		dev_err(dev, "sdhci_alloc_host() failed\n");
497 		return PTR_ERR(host);
498 	}
499 	sc = sdhci_priv(host);
500 
501 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
502 	if (!pdata) {
503 		ret = -ENOMEM;
504 		goto err_pdata_io_clk;
505 	}
506 
507 	if (pdev->dev.of_node) {
508 		ret = sdhci_s3c_parse_dt(&pdev->dev, host, pdata);
509 		if (ret)
510 			goto err_pdata_io_clk;
511 	} else {
512 		memcpy(pdata, pdev->dev.platform_data, sizeof(*pdata));
513 	}
514 
515 	drv_data = sdhci_s3c_get_driver_data(pdev);
516 
517 	sc->host = host;
518 	sc->pdev = pdev;
519 	sc->pdata = pdata;
520 	sc->cur_clk = -1;
521 
522 	platform_set_drvdata(pdev, host);
523 
524 	sc->clk_io = devm_clk_get(dev, "hsmmc");
525 	if (IS_ERR(sc->clk_io)) {
526 		dev_err(dev, "failed to get io clock\n");
527 		ret = PTR_ERR(sc->clk_io);
528 		goto err_pdata_io_clk;
529 	}
530 
531 	/* enable the local io clock and keep it running for the moment. */
532 	clk_prepare_enable(sc->clk_io);
533 
534 	for (clks = 0, ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
535 		char name[14];
536 
537 		snprintf(name, 14, "mmc_busclk.%d", ptr);
538 		sc->clk_bus[ptr] = devm_clk_get(dev, name);
539 		if (IS_ERR(sc->clk_bus[ptr]))
540 			continue;
541 
542 		clks++;
543 		sc->clk_rates[ptr] = clk_get_rate(sc->clk_bus[ptr]);
544 
545 		dev_info(dev, "clock source %d: %s (%ld Hz)\n",
546 				ptr, name, sc->clk_rates[ptr]);
547 	}
548 
549 	if (clks == 0) {
550 		dev_err(dev, "failed to find any bus clocks\n");
551 		ret = -ENOENT;
552 		goto err_no_busclks;
553 	}
554 
555 	host->ioaddr = devm_platform_ioremap_resource(pdev, 0);
556 	if (IS_ERR(host->ioaddr)) {
557 		ret = PTR_ERR(host->ioaddr);
558 		goto err_req_regs;
559 	}
560 
561 	/* Ensure we have minimal gpio selected CMD/CLK/Detect */
562 	if (pdata->cfg_gpio)
563 		pdata->cfg_gpio(pdev, pdata->max_width);
564 
565 	host->hw_name = "samsung-hsmmc";
566 	host->ops = &sdhci_s3c_ops;
567 	host->quirks = 0;
568 	host->quirks2 = 0;
569 	host->irq = irq;
570 
571 	/* Setup quirks for the controller */
572 	host->quirks |= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC;
573 	host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
574 	if (drv_data) {
575 		host->quirks |= drv_data->sdhci_quirks;
576 		sc->no_divider = drv_data->no_divider;
577 	}
578 
579 #ifndef CONFIG_MMC_SDHCI_S3C_DMA
580 
581 	/* we currently see overruns on errors, so disable the SDMA
582 	 * support as well. */
583 	host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
584 
585 #endif /* CONFIG_MMC_SDHCI_S3C_DMA */
586 
587 	/* It seems we do not get an DATA transfer complete on non-busy
588 	 * transfers, not sure if this is a problem with this specific
589 	 * SDHCI block, or a missing configuration that needs to be set. */
590 	host->quirks |= SDHCI_QUIRK_NO_BUSY_IRQ;
591 
592 	/* This host supports the Auto CMD12 */
593 	host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
594 
595 	/* Samsung SoCs need BROKEN_ADMA_ZEROLEN_DESC */
596 	host->quirks |= SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC;
597 
598 	if (pdata->cd_type == S3C_SDHCI_CD_NONE ||
599 	    pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
600 		host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
601 
602 	if (pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
603 		host->mmc->caps = MMC_CAP_NONREMOVABLE;
604 
605 	switch (pdata->max_width) {
606 	case 8:
607 		host->mmc->caps |= MMC_CAP_8_BIT_DATA;
608 		/* Fall through */
609 	case 4:
610 		host->mmc->caps |= MMC_CAP_4_BIT_DATA;
611 		break;
612 	}
613 
614 	if (pdata->pm_caps)
615 		host->mmc->pm_caps |= pdata->pm_caps;
616 
617 	host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR |
618 			 SDHCI_QUIRK_32BIT_DMA_SIZE);
619 
620 	/* HSMMC on Samsung SoCs uses SDCLK as timeout clock */
621 	host->quirks |= SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK;
622 
623 	/*
624 	 * If controller does not have internal clock divider,
625 	 * we can use overriding functions instead of default.
626 	 */
627 	if (sc->no_divider) {
628 		sdhci_s3c_ops.set_clock = sdhci_cmu_set_clock;
629 		sdhci_s3c_ops.get_min_clock = sdhci_cmu_get_min_clock;
630 		sdhci_s3c_ops.get_max_clock = sdhci_cmu_get_max_clock;
631 	}
632 
633 	/* It supports additional host capabilities if needed */
634 	if (pdata->host_caps)
635 		host->mmc->caps |= pdata->host_caps;
636 
637 	if (pdata->host_caps2)
638 		host->mmc->caps2 |= pdata->host_caps2;
639 
640 	pm_runtime_enable(&pdev->dev);
641 	pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
642 	pm_runtime_use_autosuspend(&pdev->dev);
643 	pm_suspend_ignore_children(&pdev->dev, 1);
644 
645 	ret = mmc_of_parse(host->mmc);
646 	if (ret)
647 		goto err_req_regs;
648 
649 	ret = sdhci_add_host(host);
650 	if (ret)
651 		goto err_req_regs;
652 
653 #ifdef CONFIG_PM
654 	if (pdata->cd_type != S3C_SDHCI_CD_INTERNAL)
655 		clk_disable_unprepare(sc->clk_io);
656 #endif
657 	return 0;
658 
659  err_req_regs:
660 	pm_runtime_disable(&pdev->dev);
661 
662  err_no_busclks:
663 	clk_disable_unprepare(sc->clk_io);
664 
665  err_pdata_io_clk:
666 	sdhci_free_host(host);
667 
668 	return ret;
669 }
670 
671 static int sdhci_s3c_remove(struct platform_device *pdev)
672 {
673 	struct sdhci_host *host =  platform_get_drvdata(pdev);
674 	struct sdhci_s3c *sc = sdhci_priv(host);
675 
676 	if (sc->ext_cd_irq)
677 		free_irq(sc->ext_cd_irq, sc);
678 
679 #ifdef CONFIG_PM
680 	if (sc->pdata->cd_type != S3C_SDHCI_CD_INTERNAL)
681 		clk_prepare_enable(sc->clk_io);
682 #endif
683 	sdhci_remove_host(host, 1);
684 
685 	pm_runtime_dont_use_autosuspend(&pdev->dev);
686 	pm_runtime_disable(&pdev->dev);
687 
688 	clk_disable_unprepare(sc->clk_io);
689 
690 	sdhci_free_host(host);
691 
692 	return 0;
693 }
694 
695 #ifdef CONFIG_PM_SLEEP
696 static int sdhci_s3c_suspend(struct device *dev)
697 {
698 	struct sdhci_host *host = dev_get_drvdata(dev);
699 
700 	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
701 		mmc_retune_needed(host->mmc);
702 
703 	return sdhci_suspend_host(host);
704 }
705 
706 static int sdhci_s3c_resume(struct device *dev)
707 {
708 	struct sdhci_host *host = dev_get_drvdata(dev);
709 
710 	return sdhci_resume_host(host);
711 }
712 #endif
713 
714 #ifdef CONFIG_PM
715 static int sdhci_s3c_runtime_suspend(struct device *dev)
716 {
717 	struct sdhci_host *host = dev_get_drvdata(dev);
718 	struct sdhci_s3c *ourhost = to_s3c(host);
719 	struct clk *busclk = ourhost->clk_io;
720 	int ret;
721 
722 	ret = sdhci_runtime_suspend_host(host);
723 
724 	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
725 		mmc_retune_needed(host->mmc);
726 
727 	if (ourhost->cur_clk >= 0)
728 		clk_disable_unprepare(ourhost->clk_bus[ourhost->cur_clk]);
729 	clk_disable_unprepare(busclk);
730 	return ret;
731 }
732 
733 static int sdhci_s3c_runtime_resume(struct device *dev)
734 {
735 	struct sdhci_host *host = dev_get_drvdata(dev);
736 	struct sdhci_s3c *ourhost = to_s3c(host);
737 	struct clk *busclk = ourhost->clk_io;
738 	int ret;
739 
740 	clk_prepare_enable(busclk);
741 	if (ourhost->cur_clk >= 0)
742 		clk_prepare_enable(ourhost->clk_bus[ourhost->cur_clk]);
743 	ret = sdhci_runtime_resume_host(host, 0);
744 	return ret;
745 }
746 #endif
747 
748 static const struct dev_pm_ops sdhci_s3c_pmops = {
749 	SET_SYSTEM_SLEEP_PM_OPS(sdhci_s3c_suspend, sdhci_s3c_resume)
750 	SET_RUNTIME_PM_OPS(sdhci_s3c_runtime_suspend, sdhci_s3c_runtime_resume,
751 			   NULL)
752 };
753 
754 static const struct platform_device_id sdhci_s3c_driver_ids[] = {
755 	{
756 		.name		= "s3c-sdhci",
757 		.driver_data	= (kernel_ulong_t)NULL,
758 	},
759 	{ }
760 };
761 MODULE_DEVICE_TABLE(platform, sdhci_s3c_driver_ids);
762 
763 #ifdef CONFIG_OF
764 static struct sdhci_s3c_drv_data exynos4_sdhci_drv_data = {
765 	.no_divider = true,
766 };
767 
768 static const struct of_device_id sdhci_s3c_dt_match[] = {
769 	{ .compatible = "samsung,s3c6410-sdhci", },
770 	{ .compatible = "samsung,exynos4210-sdhci",
771 		.data = &exynos4_sdhci_drv_data },
772 	{},
773 };
774 MODULE_DEVICE_TABLE(of, sdhci_s3c_dt_match);
775 #endif
776 
777 static struct platform_driver sdhci_s3c_driver = {
778 	.probe		= sdhci_s3c_probe,
779 	.remove		= sdhci_s3c_remove,
780 	.id_table	= sdhci_s3c_driver_ids,
781 	.driver		= {
782 		.name	= "s3c-sdhci",
783 		.of_match_table = of_match_ptr(sdhci_s3c_dt_match),
784 		.pm	= &sdhci_s3c_pmops,
785 	},
786 };
787 
788 module_platform_driver(sdhci_s3c_driver);
789 
790 MODULE_DESCRIPTION("Samsung SDHCI (HSMMC) glue");
791 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
792 MODULE_LICENSE("GPL v2");
793 MODULE_ALIAS("platform:s3c-sdhci");
794