aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-msm/gpio.c
blob: 33051b509e88a18679876840a6a5a4a12a4bfdc1 (plain) (blame)
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
/* linux/arch/arm/mach-msm/gpio.c
 *
 * Copyright (C) 2007 Google, Inc.
 * Copyright (c) 2009-2010, Code Aurora Forum. All rights reserved.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/bitops.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/module.h>
#include "gpio_hw.h"
#include "gpiomux.h"

#define FIRST_GPIO_IRQ MSM_GPIO_TO_INT(0)

#define MSM_GPIO_BANK(bank, first, last)				\
	{								\
		.regs = {						\
			.out =         MSM_GPIO_OUT_##bank,		\
			.in =          MSM_GPIO_IN_##bank,		\
			.int_status =  MSM_GPIO_INT_STATUS_##bank,	\
			.int_clear =   MSM_GPIO_INT_CLEAR_##bank,	\
			.int_en =      MSM_GPIO_INT_EN_##bank,		\
			.int_edge =    MSM_GPIO_INT_EDGE_##bank,	\
			.int_pos =     MSM_GPIO_INT_POS_##bank,		\
			.oe =          MSM_GPIO_OE_##bank,		\
		},							\
		.chip = {						\
			.base = (first),				\
			.ngpio = (last) - (first) + 1,			\
			.get = msm_gpio_get,				\
			.set = msm_gpio_set,				\
			.direction_input = msm_gpio_direction_input,	\
			.direction_output = msm_gpio_direction_output,	\
			.to_irq = msm_gpio_to_irq,			\
			.request = msm_gpio_request,			\
			.free = msm_gpio_free,				\
		}							\
	}

#define MSM_GPIO_BROKEN_INT_CLEAR 1

struct msm_gpio_regs {
	void __iomem *out;
	void __iomem *in;
	void __iomem *int_status;
	void __iomem *int_clear;
	void __iomem *int_en;
	void __iomem *int_edge;
	void __iomem *int_pos;
	void __iomem *oe;
};

struct msm_gpio_chip {
	spinlock_t		lock;
	struct gpio_chip	chip;
	struct msm_gpio_regs	regs;
#if MSM_GPIO_BROKEN_INT_CLEAR
	unsigned                int_status_copy;
#endif
	unsigned int            both_edge_detect;
	unsigned int            int_enable[2]; /* 0: awake, 1: sleep */
};

static int msm_gpio_write(struct msm_gpio_chip *msm_chip,
			  unsigned offset, unsigned on)
{
	unsigned mask = BIT(offset);
	unsigned val;

	val = readl(msm_chip->regs.out);
	if (on)
		writel(val | mask, msm_chip->regs.out);
	else
		writel(val & ~mask, msm_chip->regs.out);
	return 0;
}

static void msm_gpio_update_both_edge_detect(struct msm_gpio_chip *msm_chip)
{
	int loop_limit = 100;
	unsigned pol, val, val2, intstat;
	do {
		val = readl(msm_chip->regs.in);
		pol = readl(msm_chip->regs.int_pos);
		pol = (pol & ~msm_chip->both_edge_detect) |
		      (~val & msm_chip->both_edge_detect);
		writel(pol, msm_chip->regs.int_pos);
		intstat = readl(msm_chip->regs.int_status);
		val2 = readl(msm_chip->regs.in);
		if (((val ^ val2) & msm_chip->both_edge_detect & ~intstat) == 0)
			return;
	} while (loop_limit-- > 0);
	printk(KERN_ERR "msm_gpio_update_both_edge_detect, "
	       "failed to reach stable state %x != %x\n", val, val2);
}

static int msm_gpio_clear_detect_status(struct msm_gpio_chip *msm_chip,
					unsigned offset)
{
	unsigned bit = BIT(offset);

#if MSM_GPIO_BROKEN_INT_CLEAR
	/* Save interrupts that already triggered before we loose them. */
	/* Any interrupt that triggers between the read of int_status */
	/* and the write to int_clear will still be lost though. */
	msm_chip->int_status_copy |= readl(msm_chip->regs.int_status);
	msm_chip->int_status_copy &= ~bit;
#endif
	writel(bit, msm_chip->regs.int_clear);
	msm_gpio_update_both_edge_detect(msm_chip);
	return 0;
}

static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
	struct msm_gpio_chip *msm_chip;
	unsigned long irq_flags;

	msm_chip = container_of(chip, struct msm_gpio_chip, chip);
	spin_lock_irqsave(&msm_chip->lock, irq_flags);
	writel(readl(msm_chip->regs.oe) & ~BIT(offset), msm_chip->regs.oe);
	spin_unlock_irqrestore(&msm_chip->lock, irq_flags);
	return 0;
}

static int
msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value)
{
	struct msm_gpio_chip *msm_chip;
	unsigned long irq_flags;

	msm_chip = container_of(chip, struct msm_gpio_chip, chip);
	spin_lock_irqsave(&msm_chip->lock, irq_flags);
	msm_gpio_write(msm_chip, offset, value);
	writel(readl(msm_chip->regs.oe) | BIT(offset), msm_chip->regs.oe);
	spin_unlock_irqrestore(&msm_chip->lock, irq_flags);
	return 0;
}

static int msm_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct msm_gpio_chip *msm_chip;

	msm_chip = container_of(chip, struct msm_gpio_chip, chip);
	return (readl(msm_chip->regs.in) & (1U << offset)) ? 1 : 0;
}

static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct msm_gpio_chip *msm_chip;
	unsigned long irq_flags;

	msm_chip = container_of(chip, struct msm_gpio_chip, chip);
	spin_lock_irqsave(&msm_chip->lock, irq_flags);
	msm_gpio_write(msm_chip, offset, value);
	spin_unlock_irqrestore(&msm_chip->lock, irq_flags);
}

static int msm_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
	return MSM_GPIO_TO_INT(chip->base + offset);
}

#ifdef CONFIG_MSM_GPIOMUX
static int msm_gpio_request(struct gpio_chip *chip, unsigned offset)
{
	return msm_gpiomux_get(chip->base + offset);
}

static void msm_gpio_free(struct gpio_chip *chip, unsigned offset)
{
	msm_gpiomux_put(chip->base + offset);
}
#else
#define msm_gpio_request NULL
#define msm_gpio_free NULL
#endif

struct msm_gpio_chip msm_gpio_chips[] = {
#if defined(CONFIG_ARCH_MSM7X00A)
	MSM_GPIO_BANK(0,   0,  15),
	MSM_GPIO_BANK(1,  16,  42),
	MSM_GPIO_BANK(2,  43,  67),
	MSM_GPIO_BANK(3,  68,  94),
	MSM_GPIO_BANK(4,  95, 106),
	MSM_GPIO_BANK(5, 107, 121),
#elif defined(CONFIG_ARCH_MSM7X25) || defined(CONFIG_ARCH_MSM7X27)
	MSM_GPIO_BANK(0,   0,  15),
	MSM_GPIO_BANK(1,  16,  42),
	MSM_GPIO_BANK(2,  43,  67),
	MSM_GPIO_BANK(3,  68,  94),
	MSM_GPIO_BANK(4,  95, 106),
	MSM_GPIO_BANK(5, 107, 132),
#elif defined(CONFIG_ARCH_MSM7X30)
	MSM_GPIO_BANK(0,   0,  15),
	MSM_GPIO_BANK(1,  16,  43),
	MSM_GPIO_BANK(2,  44,  67),
	MSM_GPIO_BANK(3,  68,  94),
	MSM_GPIO_BANK(4,  95, 106),
	MSM_GPIO_BANK(5, 107, 133),
	MSM_GPIO_BANK(6, 134, 150),
	MSM_GPIO_BANK(7, 151, 181),
#elif defined(CONFIG_ARCH_QSD8X50)
	MSM_GPIO_BANK(0,   0,  15),
	MSM_GPIO_BANK(1,  16,  42),
	MSM_GPIO_BANK(2,  43,  67),
	MSM_GPIO_BANK(3,  68,  94),
	MSM_GPIO_BANK(4,  95, 103),
	MSM_GPIO_BANK(5, 104, 121),
	MSM_GPIO_BANK(6, 122, 152),
	MSM_GPIO_BANK(7, 153, 164),
#endif
};

static void msm_gpio_irq_ack(unsigned int irq)
{
	unsigned long irq_flags;
	struct msm_gpio_chip *msm_chip = get_irq_chip_data(irq);
	spin_lock_irqsave(&msm_chip->lock, irq_flags);
	msm_gpio_clear_detect_status(msm_chip,
				     irq - gpio_to_irq(msm_chip->chip.base));
	spin_unlock_irqrestore(&msm_chip->lock, irq_flags);
}

static void msm_gpio_irq_mask(unsigned int irq)
{
	unsigned long irq_flags;
	struct msm_gpio_chip *msm_chip = get_irq_chip_data(irq);
	unsigned offset = irq - gpio_to_irq(msm_chip->chip.base);

	spin_lock_irqsave(&msm_chip->lock, irq_flags);
	/* level triggered interrupts are also latched */
	if (!(readl(msm_chip->regs.int_edge) & BIT(offset)))
		msm_gpio_clear_detect_status(msm_chip, offset);
	msm_chip->int_enable[0] &= ~BIT(offset);
	writel(msm_chip->int_enable[0], msm_chip->regs.int_en);
	spin_unlock_irqrestore(&msm_chip->lock, irq_flags);
}

static void msm_gpio_irq_unmask(unsigned int irq)
{
	unsigned long irq_flags;
	struct msm_gpio_chip *msm_chip = get_irq_chip_data(irq);
	unsigned offset = irq - gpio_to_irq(msm_chip->chip.base);

	spin_lock_irqsave(&msm_chip->lock, irq_flags);
	/* level triggered interrupts are also latched */
	if (!(readl(msm_chip->regs.int_edge) & BIT(offset)))
		msm_gpio_clear_detect_status(msm_chip, offset);
	msm_chip->int_enable[0] |= BIT(offset);
	writel(msm_chip->int_enable[0], msm_chip->regs.int_en);
	spin_unlock_irqrestore(&msm_chip->lock, irq_flags);
}

static int msm_gpio_irq_set_wake(unsigned int irq, unsigned int on)
{
	unsigned long irq_flags;
	struct msm_gpio_chip *msm_chip = get_irq_chip_data(irq);
	unsigned offset = irq - gpio_to_irq(msm_chip->chip.base);

	spin_lock_irqsave(&msm_chip->lock, irq_flags);

	if (on)
		msm_chip->int_enable[1] |= BIT(offset);
	else
		msm_chip->int_enable[1] &= ~BIT(offset);

	spin_unlock_irqrestore(&msm_chip->lock, irq_flags);
	return 0;
}

static int msm_gpio_irq_set_type(unsigned int irq, unsigned int flow_type)
{
	unsigned long irq_flags;
	struct msm_gpio_chip *msm_chip = get_irq_chip_data(irq);
	unsigned offset = irq - gpio_to_irq(msm_chip->chip.base);
	unsigned val, mask = BIT(offset);

	spin_lock_irqsave(&msm_chip->lock, irq_flags);
	val = readl(msm_chip->regs.int_edge);
	if (flow_type & IRQ_TYPE_EDGE_BOTH) {
		writel(val | mask, msm_chip->regs.int_edge);
		irq_desc[irq].handle_irq = handle_edge_irq;
	} else {
		writel(val & ~mask, msm_chip->regs.int_edge);
		irq_desc[irq].handle_irq = handle_level_irq;
	}
	if ((flow_type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
		msm_chip->both_edge_detect |= mask;
		msm_gpio_update_both_edge_detect(msm_chip);
	} else {
		msm_chip->both_edge_detect &= ~mask;
		val = readl(msm_chip->regs.int_pos);
		if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_HIGH))
			writel(val | mask, msm_chip->regs.int_pos);
		else
			writel(val & ~mask, msm_chip->regs.int_pos);
	}
	spin_unlock_irqrestore(&msm_chip->lock, irq_flags);
	return 0;
}

static void msm_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
	int i, j, mask;
	unsigned val;

	for (i = 0; i < ARRAY_SIZE(msm_gpio_chips); i++) {
		struct msm_gpio_chip *msm_chip = &msm_gpio_chips[i];
		val = readl(msm_chip->regs.int_status);
		val &= msm_chip->int_enable[0];
		while (val) {
			mask = val & -val;
			j = fls(mask) - 1;
			/* printk("%s %08x %08x bit %d gpio %d irq %d\n",
				__func__, v, m, j, msm_chip->chip.start + j,
				FIRST_GPIO_IRQ + msm_chip->chip.start + j); */
			val &= ~mask;
			generic_handle_irq(FIRST_GPIO_IRQ +
					   msm_chip->chip.base + j);
		}
	}
	desc->chip->ack(irq);
}

static struct irq_chip msm_gpio_irq_chip = {
	.name      = "msmgpio",
	.ack       = msm_gpio_irq_ack,
	.mask      = msm_gpio_irq_mask,
	.unmask    = msm_gpio_irq_unmask,
	.set_wake  = msm_gpio_irq_set_wake,
	.set_type  = msm_gpio_irq_set_type,
};

static int __init msm_init_gpio(void)
{
	int i, j = 0;

	for (i = FIRST_GPIO_IRQ; i < FIRST_GPIO_IRQ + NR_GPIO_IRQS; i++) {
		if (i - FIRST_GPIO_IRQ >=
			msm_gpio_chips[j].chip.base +
			msm_gpio_chips[j].chip.ngpio)
			j++;
		set_irq_chip_data(i, &msm_gpio_chips[j]);
		set_irq_chip(i, &msm_gpio_irq_chip);
		set_irq_handler(i, handle_edge_irq);
		set_irq_flags(i, IRQF_VALID);
	}

	for (i = 0; i < ARRAY_SIZE(msm_gpio_chips); i++) {
		spin_lock_init(&msm_gpio_chips[i].lock);
		writel(0, msm_gpio_chips[i].regs.int_en);
		gpiochip_add(&msm_gpio_chips[i].chip);
	}

	set_irq_chained_handler(INT_GPIO_GROUP1, msm_gpio_irq_handler);
	set_irq_chained_handler(INT_GPIO_GROUP2, msm_gpio_irq_handler);
	set_irq_wake(INT_GPIO_GROUP1, 1);
	set_irq_wake(INT_GPIO_GROUP2, 2);
	return 0;
}

postcore_initcall(msm_init_gpio);