summaryrefslogtreecommitdiffstats
path: root/arch/mips/jz4740/gpio.c
blob: 6cd69fdaa1c5f95f9ce06ab31b1177c73a7f650f (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
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
/*
 *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
 *  JZ4740 platform GPIO support
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under  the terms of the GNU General	 Public License as published by the
 *  Free Software Foundation;  either version 2 of the License, or (at your
 *  option) any later version.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>

#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irqchip/ingenic.h>
#include <linux/bitops.h>

#include <linux/debugfs.h>
#include <linux/seq_file.h>

#include <asm/mach-jz4740/base.h>

#define JZ4740_GPIO_BASE_A (32*0)
#define JZ4740_GPIO_BASE_B (32*1)
#define JZ4740_GPIO_BASE_C (32*2)
#define JZ4740_GPIO_BASE_D (32*3)

#define JZ4740_GPIO_NUM_A 32
#define JZ4740_GPIO_NUM_B 32
#define JZ4740_GPIO_NUM_C 31
#define JZ4740_GPIO_NUM_D 32

#define JZ4740_IRQ_GPIO_BASE_A (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_A)
#define JZ4740_IRQ_GPIO_BASE_B (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_B)
#define JZ4740_IRQ_GPIO_BASE_C (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_C)
#define JZ4740_IRQ_GPIO_BASE_D (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_D)

#define JZ_REG_GPIO_PIN			0x00
#define JZ_REG_GPIO_DATA		0x10
#define JZ_REG_GPIO_DATA_SET		0x14
#define JZ_REG_GPIO_DATA_CLEAR		0x18
#define JZ_REG_GPIO_MASK		0x20
#define JZ_REG_GPIO_MASK_SET		0x24
#define JZ_REG_GPIO_MASK_CLEAR		0x28
#define JZ_REG_GPIO_PULL		0x30
#define JZ_REG_GPIO_PULL_SET		0x34
#define JZ_REG_GPIO_PULL_CLEAR		0x38
#define JZ_REG_GPIO_FUNC		0x40
#define JZ_REG_GPIO_FUNC_SET		0x44
#define JZ_REG_GPIO_FUNC_CLEAR		0x48
#define JZ_REG_GPIO_SELECT		0x50
#define JZ_REG_GPIO_SELECT_SET		0x54
#define JZ_REG_GPIO_SELECT_CLEAR	0x58
#define JZ_REG_GPIO_DIRECTION		0x60
#define JZ_REG_GPIO_DIRECTION_SET	0x64
#define JZ_REG_GPIO_DIRECTION_CLEAR	0x68
#define JZ_REG_GPIO_TRIGGER		0x70
#define JZ_REG_GPIO_TRIGGER_SET		0x74
#define JZ_REG_GPIO_TRIGGER_CLEAR	0x78
#define JZ_REG_GPIO_FLAG		0x80
#define JZ_REG_GPIO_FLAG_CLEAR		0x14

#define GPIO_TO_BIT(gpio) BIT(gpio & 0x1f)
#define GPIO_TO_REG(gpio, reg) (gpio_to_jz_gpio_chip(gpio)->base + (reg))
#define CHIP_TO_REG(chip, reg) (gpio_chip_to_jz_gpio_chip(chip)->base + (reg))

struct jz_gpio_chip {
	unsigned int irq;
	unsigned int irq_base;
	uint32_t edge_trigger_both;

	void __iomem *base;

	struct gpio_chip gpio_chip;
};

static struct jz_gpio_chip jz4740_gpio_chips[];

static inline struct jz_gpio_chip *gpio_to_jz_gpio_chip(unsigned int gpio)
{
	return &jz4740_gpio_chips[gpio >> 5];
}

static inline struct jz_gpio_chip *gpio_chip_to_jz_gpio_chip(struct gpio_chip *gpio_chip)
{
	return container_of(gpio_chip, struct jz_gpio_chip, gpio_chip);
}

static inline struct jz_gpio_chip *irq_to_jz_gpio_chip(struct irq_data *data)
{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
	return gc->private;
}

static inline void jz_gpio_write_bit(unsigned int gpio, unsigned int reg)
{
	writel(GPIO_TO_BIT(gpio), GPIO_TO_REG(gpio, reg));
}

int jz_gpio_set_function(int gpio, enum jz_gpio_function function)
{
	if (function == JZ_GPIO_FUNC_NONE) {
		jz_gpio_write_bit(gpio, JZ_REG_GPIO_FUNC_CLEAR);
		jz_gpio_write_bit(gpio, JZ_REG_GPIO_SELECT_CLEAR);
		jz_gpio_write_bit(gpio, JZ_REG_GPIO_TRIGGER_CLEAR);
	} else {
		jz_gpio_write_bit(gpio, JZ_REG_GPIO_FUNC_SET);
		jz_gpio_write_bit(gpio, JZ_REG_GPIO_TRIGGER_CLEAR);
		switch (function) {
		case JZ_GPIO_FUNC1:
			jz_gpio_write_bit(gpio, JZ_REG_GPIO_SELECT_CLEAR);
			break;
		case JZ_GPIO_FUNC3:
			jz_gpio_write_bit(gpio, JZ_REG_GPIO_TRIGGER_SET);
		case JZ_GPIO_FUNC2: /* Falltrough */
			jz_gpio_write_bit(gpio, JZ_REG_GPIO_SELECT_SET);
			break;
		default:
			BUG();
			break;
		}
	}

	return 0;
}
EXPORT_SYMBOL_GPL(jz_gpio_set_function);

int jz_gpio_bulk_request(const struct jz_gpio_bulk_request *request, size_t num)
{
	size_t i;
	int ret;

	for (i = 0; i < num; ++i, ++request) {
		ret = gpio_request(request->gpio, request->name);
		if (ret)
			goto err;
		jz_gpio_set_function(request->gpio, request->function);
	}

	return 0;

err:
	for (--request; i > 0; --i, --request) {
		gpio_free(request->gpio);
		jz_gpio_set_function(request->gpio, JZ_GPIO_FUNC_NONE);
	}

	return ret;
}
EXPORT_SYMBOL_GPL(jz_gpio_bulk_request);

void jz_gpio_bulk_free(const struct jz_gpio_bulk_request *request, size_t num)
{
	size_t i;

	for (i = 0; i < num; ++i, ++request) {
		gpio_free(request->gpio);
		jz_gpio_set_function(request->gpio, JZ_GPIO_FUNC_NONE);
	}

}
EXPORT_SYMBOL_GPL(jz_gpio_bulk_free);

void jz_gpio_bulk_suspend(const struct jz_gpio_bulk_request *request, size_t num)
{
	size_t i;

	for (i = 0; i < num; ++i, ++request) {
		jz_gpio_set_function(request->gpio, JZ_GPIO_FUNC_NONE);
		jz_gpio_write_bit(request->gpio, JZ_REG_GPIO_DIRECTION_CLEAR);
		jz_gpio_write_bit(request->gpio, JZ_REG_GPIO_PULL_SET);
	}
}
EXPORT_SYMBOL_GPL(jz_gpio_bulk_suspend);

void jz_gpio_bulk_resume(const struct jz_gpio_bulk_request *request, size_t num)
{
	size_t i;

	for (i = 0; i < num; ++i, ++request)
		jz_gpio_set_function(request->gpio, request->function);
}
EXPORT_SYMBOL_GPL(jz_gpio_bulk_resume);

void jz_gpio_enable_pullup(unsigned gpio)
{
	jz_gpio_write_bit(gpio, JZ_REG_GPIO_PULL_CLEAR);
}
EXPORT_SYMBOL_GPL(jz_gpio_enable_pullup);

void jz_gpio_disable_pullup(unsigned gpio)
{
	jz_gpio_write_bit(gpio, JZ_REG_GPIO_PULL_SET);
}
EXPORT_SYMBOL_GPL(jz_gpio_disable_pullup);

static int jz_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
	return !!(readl(CHIP_TO_REG(chip, JZ_REG_GPIO_PIN)) & BIT(gpio));
}

static void jz_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
{
	uint32_t __iomem *reg = CHIP_TO_REG(chip, JZ_REG_GPIO_DATA_SET);
	reg += !value;
	writel(BIT(gpio), reg);
}

static int jz_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
	int value)
{
	writel(BIT(gpio), CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION_SET));
	jz_gpio_set_value(chip, gpio, value);

	return 0;
}

static int jz_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
	writel(BIT(gpio), CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION_CLEAR));

	return 0;
}

static int jz_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
{
	struct jz_gpio_chip *jz_gpio = gpio_chip_to_jz_gpio_chip(chip);

	return jz_gpio->irq_base + gpio;
}

int jz_gpio_port_direction_input(int port, uint32_t mask)
{
	writel(mask, GPIO_TO_REG(port, JZ_REG_GPIO_DIRECTION_CLEAR));

	return 0;
}
EXPORT_SYMBOL(jz_gpio_port_direction_input);

int jz_gpio_port_direction_output(int port, uint32_t mask)
{
	writel(mask, GPIO_TO_REG(port, JZ_REG_GPIO_DIRECTION_SET));

	return 0;
}
EXPORT_SYMBOL(jz_gpio_port_direction_output);

void jz_gpio_port_set_value(int port, uint32_t value, uint32_t mask)
{
	writel(~value & mask, GPIO_TO_REG(port, JZ_REG_GPIO_DATA_CLEAR));
	writel(value & mask, GPIO_TO_REG(port, JZ_REG_GPIO_DATA_SET));
}
EXPORT_SYMBOL(jz_gpio_port_set_value);

uint32_t jz_gpio_port_get_value(int port, uint32_t mask)
{
	uint32_t value = readl(GPIO_TO_REG(port, JZ_REG_GPIO_PIN));

	return value & mask;
}
EXPORT_SYMBOL(jz_gpio_port_get_value);

#define IRQ_TO_BIT(irq) BIT(irq_to_gpio(irq) & 0x1f)

static void jz_gpio_check_trigger_both(struct jz_gpio_chip *chip, unsigned int irq)
{
	uint32_t value;
	void __iomem *reg;
	uint32_t mask = IRQ_TO_BIT(irq);

	if (!(chip->edge_trigger_both & mask))
		return;

	reg = chip->base;

	value = readl(chip->base + JZ_REG_GPIO_PIN);
	if (value & mask)
		reg += JZ_REG_GPIO_DIRECTION_CLEAR;
	else
		reg += JZ_REG_GPIO_DIRECTION_SET;

	writel(mask, reg);
}

static void jz_gpio_irq_demux_handler(unsigned int irq, struct irq_desc *desc)
{
	uint32_t flag;
	unsigned int gpio_irq;
	struct jz_gpio_chip *chip = irq_desc_get_handler_data(desc);

	flag = readl(chip->base + JZ_REG_GPIO_FLAG);
	if (!flag)
		return;

	gpio_irq = chip->irq_base + __fls(flag);

	jz_gpio_check_trigger_both(chip, gpio_irq);

	generic_handle_irq(gpio_irq);
};

static inline void jz_gpio_set_irq_bit(struct irq_data *data, unsigned int reg)
{
	struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
	writel(IRQ_TO_BIT(data->irq), chip->base + reg);
}

static void jz_gpio_irq_unmask(struct irq_data *data)
{
	struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);

	jz_gpio_check_trigger_both(chip, data->irq);
	irq_gc_unmask_enable_reg(data);
};

/* TODO: Check if function is gpio */
static unsigned int jz_gpio_irq_startup(struct irq_data *data)
{
	jz_gpio_set_irq_bit(data, JZ_REG_GPIO_SELECT_SET);
	jz_gpio_irq_unmask(data);
	return 0;
}

static void jz_gpio_irq_shutdown(struct irq_data *data)
{
	irq_gc_mask_disable_reg(data);

	/* Set direction to input */
	jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_CLEAR);
	jz_gpio_set_irq_bit(data, JZ_REG_GPIO_SELECT_CLEAR);
}

static int jz_gpio_irq_set_type(struct irq_data *data, unsigned int flow_type)
{
	struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
	unsigned int irq = data->irq;

	if (flow_type == IRQ_TYPE_EDGE_BOTH) {
		uint32_t value = readl(chip->base + JZ_REG_GPIO_PIN);
		if (value & IRQ_TO_BIT(irq))
			flow_type = IRQ_TYPE_EDGE_FALLING;
		else
			flow_type = IRQ_TYPE_EDGE_RISING;
		chip->edge_trigger_both |= IRQ_TO_BIT(irq);
	} else {
		chip->edge_trigger_both &= ~IRQ_TO_BIT(irq);
	}

	switch (flow_type) {
	case IRQ_TYPE_EDGE_RISING:
		jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_SET);
		jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_SET);
		break;
	case IRQ_TYPE_EDGE_FALLING:
		jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_CLEAR);
		jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_SET);
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_SET);
		jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_CLEAR);
		break;
	case IRQ_TYPE_LEVEL_LOW:
		jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_CLEAR);
		jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_CLEAR);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int jz_gpio_irq_set_wake(struct irq_data *data, unsigned int on)
{
	struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);

	irq_gc_set_wake(data, on);
	irq_set_irq_wake(chip->irq, on);

	return 0;
}

#define JZ4740_GPIO_CHIP(_bank) { \
	.irq_base = JZ4740_IRQ_GPIO_BASE_ ## _bank, \
	.gpio_chip = { \
		.label = "Bank " # _bank, \
		.owner = THIS_MODULE, \
		.set = jz_gpio_set_value, \
		.get = jz_gpio_get_value, \
		.direction_output = jz_gpio_direction_output, \
		.direction_input = jz_gpio_direction_input, \
		.to_irq = jz_gpio_to_irq, \
		.base = JZ4740_GPIO_BASE_ ## _bank, \
		.ngpio = JZ4740_GPIO_NUM_ ## _bank, \
	}, \
}

static struct jz_gpio_chip jz4740_gpio_chips[] = {
	JZ4740_GPIO_CHIP(A),
	JZ4740_GPIO_CHIP(B),
	JZ4740_GPIO_CHIP(C),
	JZ4740_GPIO_CHIP(D),
};

static void jz4740_gpio_chip_init(struct jz_gpio_chip *chip, unsigned int id)
{
	struct irq_chip_generic *gc;
	struct irq_chip_type *ct;

	chip->base = ioremap(JZ4740_GPIO_BASE_ADDR + (id * 0x100), 0x100);

	chip->irq = JZ4740_IRQ_INTC_GPIO(id);
	irq_set_chained_handler_and_data(chip->irq,
					 jz_gpio_irq_demux_handler, chip);

	gc = irq_alloc_generic_chip(chip->gpio_chip.label, 1, chip->irq_base,
		chip->base, handle_level_irq);

	gc->wake_enabled = IRQ_MSK(chip->gpio_chip.ngpio);
	gc->private = chip;

	ct = gc->chip_types;
	ct->regs.enable = JZ_REG_GPIO_MASK_CLEAR;
	ct->regs.disable = JZ_REG_GPIO_MASK_SET;
	ct->regs.ack = JZ_REG_GPIO_FLAG_CLEAR;

	ct->chip.name = "GPIO";
	ct->chip.irq_mask = irq_gc_mask_disable_reg;
	ct->chip.irq_unmask = jz_gpio_irq_unmask;
	ct->chip.irq_ack = irq_gc_ack_set_bit;
	ct->chip.irq_suspend = ingenic_intc_irq_suspend;
	ct->chip.irq_resume = ingenic_intc_irq_resume;
	ct->chip.irq_startup = jz_gpio_irq_startup;
	ct->chip.irq_shutdown = jz_gpio_irq_shutdown;
	ct->chip.irq_set_type = jz_gpio_irq_set_type;
	ct->chip.irq_set_wake = jz_gpio_irq_set_wake;
	ct->chip.flags = IRQCHIP_SET_TYPE_MASKED;

	irq_setup_generic_chip(gc, IRQ_MSK(chip->gpio_chip.ngpio),
		IRQ_GC_INIT_NESTED_LOCK, 0, IRQ_NOPROBE | IRQ_LEVEL);

	gpiochip_add(&chip->gpio_chip);
}

static int __init jz4740_gpio_init(void)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(jz4740_gpio_chips); ++i)
		jz4740_gpio_chip_init(&jz4740_gpio_chips[i], i);

	printk(KERN_INFO "JZ4740 GPIO initialized\n");

	return 0;
}
arch_initcall(jz4740_gpio_init);

#ifdef CONFIG_DEBUG_FS

static inline void gpio_seq_reg(struct seq_file *s, struct jz_gpio_chip *chip,
	const char *name, unsigned int reg)
{
	seq_printf(s, "\t%s: %08x\n", name, readl(chip->base + reg));
}

static int gpio_regs_show(struct seq_file *s, void *unused)
{
	struct jz_gpio_chip *chip = jz4740_gpio_chips;
	int i;

	for (i = 0; i < ARRAY_SIZE(jz4740_gpio_chips); ++i, ++chip) {
		seq_printf(s, "==GPIO %d==\n", i);
		gpio_seq_reg(s, chip, "Pin", JZ_REG_GPIO_PIN);
		gpio_seq_reg(s, chip, "Data", JZ_REG_GPIO_DATA);
		gpio_seq_reg(s, chip, "Mask", JZ_REG_GPIO_MASK);
		gpio_seq_reg(s, chip, "Pull", JZ_REG_GPIO_PULL);
		gpio_seq_reg(s, chip, "Func", JZ_REG_GPIO_FUNC);
		gpio_seq_reg(s, chip, "Select", JZ_REG_GPIO_SELECT);
		gpio_seq_reg(s, chip, "Direction", JZ_REG_GPIO_DIRECTION);
		gpio_seq_reg(s, chip, "Trigger", JZ_REG_GPIO_TRIGGER);
		gpio_seq_reg(s, chip, "Flag", JZ_REG_GPIO_FLAG);
	}

	return 0;
}

static int gpio_regs_open(struct inode *inode, struct file *file)
{
	return single_open(file, gpio_regs_show, NULL);
}

static const struct file_operations gpio_regs_operations = {
	.open		= gpio_regs_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int __init gpio_debugfs_init(void)
{
	(void) debugfs_create_file("jz_regs_gpio", S_IFREG | S_IRUGO,
				NULL, NULL, &gpio_regs_operations);
	return 0;
}
subsys_initcall(gpio_debugfs_init);

#endif
OpenPOWER on IntegriCloud