summaryrefslogtreecommitdiff
path: root/arch/arm/mach-omap2/mmc-twl4030.c
blob: 9756a878fd90263c5ddd4fcfd7a1d6dc60228c77 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
/*
 * linux/arch/arm/mach-omap2/mmc-twl4030.c
 *
 * Copyright (C) 2007-2008 Texas Instruments
 * Copyright (C) 2008 Nokia Corporation
 * Author: Texas Instruments
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/mmc/host.h>
#include <linux/regulator/consumer.h>

#include <mach/hardware.h>
#include <mach/control.h>
#include <mach/mmc.h>
#include <mach/board.h>

#include "mmc-twl4030.h"


#if defined(CONFIG_REGULATOR) && \
	(defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE))

static u16 control_pbias_offset;
static u16 control_devconf1_offset;

#define HSMMC_NAME_LEN	9

static struct twl_mmc_controller {
	struct omap_mmc_platform_data	*mmc;
	/* Vcc == configured supply
	 * Vcc_alt == optional
	 *   -	MMC1, supply for DAT4..DAT7
	 *   -	MMC2/MMC2, external level shifter voltage supply, for
	 *	chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
	 */
	struct regulator		*vcc;
	struct regulator		*vcc_aux;
	char				name[HSMMC_NAME_LEN + 1];
} hsmmc[OMAP34XX_NR_MMC];

static int twl_mmc_card_detect(int irq)
{
	unsigned i;

	for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
		struct omap_mmc_platform_data *mmc;

		mmc = hsmmc[i].mmc;
		if (!mmc)
			continue;
		if (irq != mmc->slots[0].card_detect_irq)
			continue;

		/* NOTE: assumes card detect signal is active-low */
		return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
	}
	return -ENOSYS;
}

static int twl_mmc_get_ro(struct device *dev, int slot)
{
	struct omap_mmc_platform_data *mmc = dev->platform_data;

	/* NOTE: assumes write protect signal is active-high */
	return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
}

static int twl_mmc_get_cover_state(struct device *dev, int slot)
{
	struct omap_mmc_platform_data *mmc = dev->platform_data;

	/* NOTE: assumes card detect signal is active-low */
	return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
}

/*
 * MMC Slot Initialization.
 */
static int twl_mmc_late_init(struct device *dev)
{
	struct omap_mmc_platform_data *mmc = dev->platform_data;
	int ret = 0;
	int i;

	/* MMC/SD/SDIO doesn't require a card detect switch */
	if (gpio_is_valid(mmc->slots[0].switch_pin)) {
		ret = gpio_request(mmc->slots[0].switch_pin, "mmc_cd");
		if (ret)
			goto done;
		ret = gpio_direction_input(mmc->slots[0].switch_pin);
		if (ret)
			goto err;
	}

	/* require at least main regulator */
	for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
		if (hsmmc[i].name == mmc->slots[0].name) {
			struct regulator *reg;

			hsmmc[i].mmc = mmc;

			reg = regulator_get(dev, "vmmc");
			if (IS_ERR(reg)) {
				dev_dbg(dev, "vmmc regulator missing\n");
				/* HACK: until fixed.c regulator is usable,
				 * we don't require a main regulator
				 * for MMC2 or MMC3
				 */
				if (i != 0)
					break;
				ret = PTR_ERR(reg);
				goto err;
			}
			hsmmc[i].vcc = reg;
			mmc->slots[0].ocr_mask = mmc_regulator_get_ocrmask(reg);

			/* allow an aux regulator */
			reg = regulator_get(dev, "vmmc_aux");
			hsmmc[i].vcc_aux = IS_ERR(reg) ? NULL : reg;

			/* UGLY HACK:  workaround regulator framework bugs.
			 * When the bootloader leaves a supply active, it's
			 * initialized with zero usecount ... and we can't
			 * disable it without first enabling it.  Until the
			 * framework is fixed, we need a workaround like this
			 * (which is safe for MMC, but not in general).
			 */
			if (regulator_is_enabled(hsmmc[i].vcc) > 0) {
				regulator_enable(hsmmc[i].vcc);
				regulator_disable(hsmmc[i].vcc);
			}
			if (hsmmc[i].vcc_aux) {
				if (regulator_is_enabled(reg) > 0) {
					regulator_enable(reg);
					regulator_disable(reg);
				}
			}

			break;
		}
	}

	return 0;

err:
	gpio_free(mmc->slots[0].switch_pin);
done:
	mmc->slots[0].card_detect_irq = 0;
	mmc->slots[0].card_detect = NULL;

	dev_err(dev, "err %d configuring card detect\n", ret);
	return ret;
}

static void twl_mmc_cleanup(struct device *dev)
{
	struct omap_mmc_platform_data *mmc = dev->platform_data;

	gpio_free(mmc->slots[0].switch_pin);
}

#ifdef CONFIG_PM

static int twl_mmc_suspend(struct device *dev, int slot)
{
	struct omap_mmc_platform_data *mmc = dev->platform_data;

	disable_irq(mmc->slots[0].card_detect_irq);
	return 0;
}

static int twl_mmc_resume(struct device *dev, int slot)
{
	struct omap_mmc_platform_data *mmc = dev->platform_data;

	enable_irq(mmc->slots[0].card_detect_irq);
	return 0;
}

#else
#define twl_mmc_suspend	NULL
#define twl_mmc_resume	NULL
#endif

static int twl_mmc1_set_power(struct device *dev, int slot, int power_on,
				int vdd)
{
	u32 reg;
	int ret = 0;
	struct twl_mmc_controller *c = &hsmmc[0];
	struct omap_mmc_platform_data *mmc = dev->platform_data;

	/*
	 * Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
	 * card with Vcc regulator (from twl4030 or whatever).  OMAP has both
	 * 1.8V and 3.0V modes, controlled by the PBIAS register.
	 *
	 * In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
	 * is most naturally TWL VSIM; those pins also use PBIAS.
	 *
	 * FIXME handle VMMC1A as needed ...
	 */
	if (power_on) {
		if (cpu_is_omap2430()) {
			reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
			if ((1 << vdd) >= MMC_VDD_30_31)
				reg |= OMAP243X_MMC1_ACTIVE_OVERWRITE;
			else
				reg &= ~OMAP243X_MMC1_ACTIVE_OVERWRITE;
			omap_ctrl_writel(reg, OMAP243X_CONTROL_DEVCONF1);
		}

		if (mmc->slots[0].internal_clock) {
			reg = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
			reg |= OMAP2_MMCSDIO1ADPCLKISEL;
			omap_ctrl_writel(reg, OMAP2_CONTROL_DEVCONF0);
		}

		reg = omap_ctrl_readl(control_pbias_offset);
		reg |= OMAP2_PBIASSPEEDCTRL0;
		reg &= ~OMAP2_PBIASLITEPWRDNZ0;
		omap_ctrl_writel(reg, control_pbias_offset);

		ret = mmc_regulator_set_ocr(c->vcc, vdd);

		/* 100ms delay required for PBIAS configuration */
		msleep(100);
		reg = omap_ctrl_readl(control_pbias_offset);
		reg |= (OMAP2_PBIASLITEPWRDNZ0 | OMAP2_PBIASSPEEDCTRL0);
		if ((1 << vdd) <= MMC_VDD_165_195)
			reg &= ~OMAP2_PBIASLITEVMODE0;
		else
			reg |= OMAP2_PBIASLITEVMODE0;
		omap_ctrl_writel(reg, control_pbias_offset);
	} else {
		reg = omap_ctrl_readl(control_pbias_offset);
		reg &= ~OMAP2_PBIASLITEPWRDNZ0;
		omap_ctrl_writel(reg, control_pbias_offset);

		ret = mmc_regulator_set_ocr(c->vcc, 0);

		/* 100ms delay required for PBIAS configuration */
		msleep(100);
		reg = omap_ctrl_readl(control_pbias_offset);
		reg |= (OMAP2_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
			OMAP2_PBIASLITEVMODE0);
		omap_ctrl_writel(reg, control_pbias_offset);
	}

	return ret;
}

static int twl_mmc23_set_power(struct device *dev, int slot, int power_on, int vdd)
{
	int ret = 0;
	struct twl_mmc_controller *c = &hsmmc[1];
	struct omap_mmc_platform_data *mmc = dev->platform_data;

	/* If we don't see a Vcc regulator, assume it's a fixed
	 * voltage always-on regulator.
	 */
	if (!c->vcc)
		return 0;

	/*
	 * Assume Vcc regulator is used only to power the card ... OMAP
	 * VDDS is used to power the pins, optionally with a transceiver to
	 * support cards using voltages other than VDDS (1.8V nominal).  When a
	 * transceiver is used, DAT3..7 are muxed as transceiver control pins.
	 *
	 * In some cases this regulator won't support enable/disable;
	 * e.g. it's a fixed rail for a WLAN chip.
	 *
	 * In other cases vcc_aux switches interface power.  Example, for
	 * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
	 * chips/cards need an interface voltage rail too.
	 */
	if (power_on) {
		/* only MMC2 supports a CLKIN */
		if (mmc->slots[0].internal_clock) {
			u32 reg;

			reg = omap_ctrl_readl(control_devconf1_offset);
			reg |= OMAP2_MMCSDIO2ADPCLKISEL;
			omap_ctrl_writel(reg, control_devconf1_offset);
		}
		ret = mmc_regulator_set_ocr(c->vcc, vdd);
		/* enable interface voltage rail, if needed */
		if (ret == 0 && c->vcc_aux) {
			ret = regulator_enable(c->vcc_aux);
			if (ret < 0)
				ret = mmc_regulator_set_ocr(c->vcc, 0);
		}
	} else {
		if (c->vcc_aux && (ret = regulator_is_enabled(c->vcc_aux)) > 0)
			ret = regulator_disable(c->vcc_aux);
		if (ret == 0)
			ret = mmc_regulator_set_ocr(c->vcc, 0);
	}

	return ret;
}

static struct omap_mmc_platform_data *hsmmc_data[OMAP34XX_NR_MMC] __initdata;

void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
{
	struct twl4030_hsmmc_info *c;
	int nr_hsmmc = ARRAY_SIZE(hsmmc_data);

	if (cpu_is_omap2430()) {
		control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
		control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
		nr_hsmmc = 2;
	} else {
		control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
		control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
	}

	for (c = controllers; c->mmc; c++) {
		struct twl_mmc_controller *twl = hsmmc + c->mmc - 1;
		struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];

		if (!c->mmc || c->mmc > nr_hsmmc) {
			pr_debug("MMC%d: no such controller\n", c->mmc);
			continue;
		}
		if (mmc) {
			pr_debug("MMC%d: already configured\n", c->mmc);
			continue;
		}

		mmc = kzalloc(sizeof(struct omap_mmc_platform_data), GFP_KERNEL);
		if (!mmc) {
			pr_err("Cannot allocate memory for mmc device!\n");
			return;
		}

		if (c->name)
			strncpy(twl->name, c->name, HSMMC_NAME_LEN);
		else
			snprintf(twl->name, ARRAY_SIZE(twl->name),
				"mmc%islot%i", c->mmc, 1);
		mmc->slots[0].name = twl->name;
		mmc->nr_slots = 1;
		mmc->slots[0].wires = c->wires;
		mmc->slots[0].internal_clock = !c->ext_clock;
		mmc->dma_mask = 0xffffffff;
		mmc->init = twl_mmc_late_init;

		/* note: twl4030 card detect GPIOs can disable VMMCx ... */
		if (gpio_is_valid(c->gpio_cd)) {
			mmc->cleanup = twl_mmc_cleanup;
			mmc->suspend = twl_mmc_suspend;
			mmc->resume = twl_mmc_resume;

			mmc->slots[0].switch_pin = c->gpio_cd;
			mmc->slots[0].card_detect_irq = gpio_to_irq(c->gpio_cd);
			if (c->cover_only)
				mmc->slots[0].get_cover_state = twl_mmc_get_cover_state;
			else
				mmc->slots[0].card_detect = twl_mmc_card_detect;
		} else
			mmc->slots[0].switch_pin = -EINVAL;

		/* write protect normally uses an OMAP gpio */
		if (gpio_is_valid(c->gpio_wp)) {
			gpio_request(c->gpio_wp, "mmc_wp");
			gpio_direction_input(c->gpio_wp);

			mmc->slots[0].gpio_wp = c->gpio_wp;
			mmc->slots[0].get_ro = twl_mmc_get_ro;
		} else
			mmc->slots[0].gpio_wp = -EINVAL;

		/* NOTE:  MMC slots should have a Vcc regulator set up.
		 * This may be from a TWL4030-family chip, another
		 * controllable regulator, or a fixed supply.
		 *
		 * temporary HACK: ocr_mask instead of fixed supply
		 */
		mmc->slots[0].ocr_mask = c->ocr_mask;

		switch (c->mmc) {
		case 1:
			/* on-chip level shifting via PBIAS0/PBIAS1 */
			mmc->slots[0].set_power = twl_mmc1_set_power;
			break;
		case 2:
			if (c->ext_clock)
				c->transceiver = 1;
			if (c->transceiver && c->wires > 4)
				c->wires = 4;
			/* FALLTHROUGH */
		case 3:
			/* off-chip level shifting, or none */
			mmc->slots[0].set_power = twl_mmc23_set_power;
			break;
		default:
			pr_err("MMC%d configuration not supported!\n", c->mmc);
			kfree(mmc);
			continue;
		}
		hsmmc_data[c->mmc - 1] = mmc;
	}

	omap2_init_mmc(hsmmc_data, OMAP34XX_NR_MMC);

	/* pass the device nodes back to board setup code */
	for (c = controllers; c->mmc; c++) {
		struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];

		if (!c->mmc || c->mmc > nr_hsmmc)
			continue;
		c->dev = mmc->dev;
	}
}

#endif