summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-u300/gpio.c
blob: d92790140fe53852bd4e571ed29fe95f490e8e77 (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
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
/*
 *
 * arch/arm/mach-u300/gpio.c
 *
 *
 * Copyright (C) 2007-2009 ST-Ericsson AB
 * License terms: GNU General Public License (GPL) version 2
 * U300 GPIO module.
 * This can driver either of the two basic GPIO cores
 * available in the U300 platforms:
 * COH 901 335   - Used in DB3150 (U300 1.0) and DB3200 (U330 1.0)
 * COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0)
 * Notice that you also have inline macros in <asm-arch/gpio.h>
 * Author: Linus Walleij <linus.walleij@stericsson.com>
 * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
 *
 */
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>

/* Reference to GPIO block clock */
static struct clk *clk;

/* Memory resource */
static struct resource *memres;
static void __iomem *virtbase;
static struct device *gpiodev;

struct u300_gpio_port {
	const char *name;
	int irq;
	int number;
};


static struct u300_gpio_port gpio_ports[] = {
	{
		.name = "gpio0",
		.number = 0,
	},
	{
		.name = "gpio1",
		.number = 1,
	},
	{
		.name = "gpio2",
		.number = 2,
	},
#ifdef U300_COH901571_3
	{
		.name = "gpio3",
		.number = 3,
	},
	{
		.name = "gpio4",
		.number = 4,
	},
#ifdef CONFIG_MACH_U300_BS335
	{
		.name = "gpio5",
		.number = 5,
	},
	{
		.name = "gpio6",
		.number = 6,
	},
#endif
#endif

};


#ifdef U300_COH901571_3

/* Default input value */
#define DEFAULT_OUTPUT_LOW   0
#define DEFAULT_OUTPUT_HIGH  1

/* GPIO Pull-Up status */
#define DISABLE_PULL_UP  0
#define ENABLE_PULL_UP  1

#define GPIO_NOT_USED 0
#define GPIO_IN       1
#define GPIO_OUT      2

struct u300_gpio_configuration_data {
	unsigned char pin_usage;
	unsigned char default_output_value;
	unsigned char pull_up;
};

/* Initial configuration */
const struct u300_gpio_configuration_data
u300_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = {
#ifdef CONFIG_MACH_U300_BS335
	/* Port 0, pins 0-7 */
	{
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_HIGH,  DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
	},
	/* Port 1, pins 0-7 */
	{
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_HIGH,  DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
	},
	/* Port 2, pins 0-7 */
	{
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP}
	},
	/* Port 3, pins 0-7 */
	{
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
	},
	/* Port 4, pins 0-7 */
	{
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
	},
	/* Port 5, pins 0-7 */
	{
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
	},
	/* Port 6, pind 0-7 */
	{
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
	}
#endif

#ifdef CONFIG_MACH_U300_BS365
	/* Port 0, pins 0-7 */
	{
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
	},
	/* Port 1, pins 0-7 */
	{
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_HIGH,  DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
	},
	/* Port 2, pins 0-7 */
	{
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP}
	},
	/* Port 3, pins 0-7 */
	{
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP}
	},
	/* Port 4, pins 0-7 */
	{
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		/* These 4 pins doesn't exist on DB3210 */
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
		{GPIO_OUT, DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP}
	}
#endif
};
#endif


/* No users == we can power down GPIO */
static int gpio_users;

struct gpio_struct {
	int (*callback)(void *);
	void *data;
	int users;
};

static struct gpio_struct gpio_pin[U300_GPIO_MAX];

/*
 * Let drivers register callback in order to get notified when there is
 * an interrupt on the gpio pin
 */
int gpio_register_callback(unsigned gpio, int (*func)(void *arg), void *data)
{
	if (gpio_pin[gpio].callback)
		dev_warn(gpiodev, "%s: WARNING: callback already "
			 "registered for gpio pin#%d\n", __func__, gpio);
	gpio_pin[gpio].callback = func;
	gpio_pin[gpio].data = data;

	return 0;
}
EXPORT_SYMBOL(gpio_register_callback);

int gpio_unregister_callback(unsigned gpio)
{
	if (!gpio_pin[gpio].callback)
		dev_warn(gpiodev, "%s: WARNING: callback already "
			 "unregistered for gpio pin#%d\n", __func__, gpio);
	gpio_pin[gpio].callback = NULL;
	gpio_pin[gpio].data = NULL;

	return 0;
}
EXPORT_SYMBOL(gpio_unregister_callback);

/* Non-zero means valid */
int gpio_is_valid(int number)
{
	if (number >= 0 &&
	    number < (U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT))
		return 1;
	return 0;
}
EXPORT_SYMBOL(gpio_is_valid);

int gpio_request(unsigned gpio, const char *label)
{
	if (gpio_pin[gpio].users)
		return -EINVAL;
	else
		gpio_pin[gpio].users++;

	gpio_users++;

	return 0;
}
EXPORT_SYMBOL(gpio_request);

void gpio_free(unsigned gpio)
{
	gpio_users--;
	gpio_pin[gpio].users--;
	if (unlikely(gpio_pin[gpio].users < 0)) {
		dev_warn(gpiodev, "warning: gpio#%d release mismatch\n",
			 gpio);
		gpio_pin[gpio].users = 0;
	}

	return;
}
EXPORT_SYMBOL(gpio_free);

/* This returns zero or nonzero */
int gpio_get_value(unsigned gpio)
{
	return readl(virtbase + U300_GPIO_PXPDIR +
	  PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING) & (1 << (gpio & 0x07));
}
EXPORT_SYMBOL(gpio_get_value);

/*
 * We hope that the compiler will optimize away the unused branch
 * in case "value" is a constant
 */
void gpio_set_value(unsigned gpio, int value)
{
	u32 val;
	unsigned long flags;

	local_irq_save(flags);
	if (value) {
		/* set */
		val = readl(virtbase + U300_GPIO_PXPDOR +
		  PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING)
		  & (1 << (gpio & 0x07));
		writel(val | (1 << (gpio & 0x07)), virtbase +
		  U300_GPIO_PXPDOR +
		  PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
	} else {
		/* clear */
		val = readl(virtbase + U300_GPIO_PXPDOR +
		  PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING)
		  & (1 << (gpio & 0x07));
		writel(val & ~(1 << (gpio & 0x07)), virtbase +
		  U300_GPIO_PXPDOR +
		  PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
	}
	local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_set_value);

int gpio_direction_input(unsigned gpio)
{
	unsigned long flags;
	u32 val;

	if (gpio > U300_GPIO_MAX)
		return -EINVAL;

	local_irq_save(flags);
	val = readl(virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
				U300_GPIO_PORTX_SPACING);
	/* Mask out this pin*/
	val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((gpio & 0x07) << 1));
	/* This is not needed since it sets the bits to zero.*/
	/* val |= (U300_GPIO_PXPCR_PIN_MODE_INPUT << (gpio*2)); */
	writel(val, virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
				U300_GPIO_PORTX_SPACING);
	local_irq_restore(flags);
	return 0;
}
EXPORT_SYMBOL(gpio_direction_input);

int gpio_direction_output(unsigned gpio, int value)
{
	unsigned long flags;
	u32 val;

	if (gpio > U300_GPIO_MAX)
		return -EINVAL;

	local_irq_save(flags);
	val = readl(virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
				U300_GPIO_PORTX_SPACING);
	/* Mask out this pin */
	val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((gpio & 0x07) << 1));
	/*
	 * FIXME: configure for push/pull, open drain or open source per pin
	 * in setup. The current driver will only support push/pull.
	 */
	val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
			<< ((gpio & 0x07) << 1));
	writel(val, virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
				U300_GPIO_PORTX_SPACING);
	gpio_set_value(gpio, value);
	local_irq_restore(flags);
	return 0;
}
EXPORT_SYMBOL(gpio_direction_output);

/*
 * Enable an IRQ, edge is rising edge (!= 0) or falling edge (==0).
 */
void enable_irq_on_gpio_pin(unsigned gpio, int edge)
{
	u32 val;
	unsigned long flags;
	local_irq_save(flags);

	val = readl(virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
				U300_GPIO_PORTX_SPACING);
	val |= (1 << (gpio & 0x07));
	writel(val, virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
				U300_GPIO_PORTX_SPACING);
	val = readl(virtbase + U300_GPIO_PXICR + PIN_TO_PORT(gpio) *
				U300_GPIO_PORTX_SPACING);
	if (edge)
		val |= (1 << (gpio & 0x07));
	else
		val &= ~(1 << (gpio & 0x07));
	writel(val, virtbase + U300_GPIO_PXICR + PIN_TO_PORT(gpio) *
				U300_GPIO_PORTX_SPACING);
	local_irq_restore(flags);
}
EXPORT_SYMBOL(enable_irq_on_gpio_pin);

void disable_irq_on_gpio_pin(unsigned gpio)
{
	u32 val;
	unsigned long flags;

	local_irq_save(flags);
	val = readl(virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
				U300_GPIO_PORTX_SPACING);
	val &= ~(1 << (gpio & 0x07));
	writel(val, virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
				U300_GPIO_PORTX_SPACING);
	local_irq_restore(flags);
}
EXPORT_SYMBOL(disable_irq_on_gpio_pin);

/* Enable (value == 0) or disable (value == 1) internal pullup */
void gpio_pullup(unsigned gpio, int value)
{
	u32 val;
	unsigned long flags;

	local_irq_save(flags);
	if (value) {
		val = readl(virtbase + U300_GPIO_PXPER + PIN_TO_PORT(gpio) *
					U300_GPIO_PORTX_SPACING);
		writel(val | (1 << (gpio & 0x07)), virtbase + U300_GPIO_PXPER +
				PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
	} else {
		val = readl(virtbase + U300_GPIO_PXPER + PIN_TO_PORT(gpio) *
					U300_GPIO_PORTX_SPACING);
		writel(val & ~(1 << (gpio & 0x07)), virtbase + U300_GPIO_PXPER +
				PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
	}
	local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_pullup);

static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
{
	struct u300_gpio_port *port = dev_id;
	u32 val;
	int pin;

	/* Read event register */
	val = readl(virtbase + U300_GPIO_PXIEV + port->number *
				U300_GPIO_PORTX_SPACING);
	/* Mask with enable register */
	val &= readl(virtbase + U300_GPIO_PXIEV + port->number *
				U300_GPIO_PORTX_SPACING);
	/* Mask relevant bits */
	val &= U300_GPIO_PXIEV_ALL_IRQ_EVENT_MASK;
	/* ACK IRQ (clear event) */
	writel(val, virtbase + U300_GPIO_PXIEV + port->number *
				U300_GPIO_PORTX_SPACING);
	/* Print message */
	while (val != 0) {
		unsigned gpio;

		pin = __ffs(val);
		/* mask off this pin */
		val &= ~(1 << pin);
		gpio = (port->number << 3) + pin;

		if (gpio_pin[gpio].callback)
			(void)gpio_pin[gpio].callback(gpio_pin[gpio].data);
		else
			dev_dbg(gpiodev, "stray GPIO IRQ on line %d\n",
			       gpio);
	}
	return IRQ_HANDLED;
}

static void gpio_set_initial_values(void)
{
#ifdef U300_COH901571_3
	int i, j;
	unsigned long flags;
	u32 val;

	/* Write default values to all pins */
	for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
		val = 0;
		for (j = 0; j < 8; j++)
			val |= (u32) (u300_gpio_config[i][j].default_output_value != DEFAULT_OUTPUT_LOW) << j;
		local_irq_save(flags);
		writel(val, virtbase + U300_GPIO_PXPDOR + i * U300_GPIO_PORTX_SPACING);
		local_irq_restore(flags);
	}

	/*
	 * Put all pins that are set to either 'GPIO_OUT' or 'GPIO_NOT_USED'
	 * to output and 'GPIO_IN' to input for each port. And initialize
	 * default value on outputs.
	 */
	for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
		for (j = 0; j < U300_GPIO_PINS_PER_PORT; j++) {
			local_irq_save(flags);
			val = readl(virtbase + U300_GPIO_PXPCR +
					 i * U300_GPIO_PORTX_SPACING);
			/* Mask out this pin */
			val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << (j << 1));

			if (u300_gpio_config[i][j].pin_usage != GPIO_IN)
				val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL << (j << 1));
			writel(val, virtbase + U300_GPIO_PXPCR +
					 i * U300_GPIO_PORTX_SPACING);
			local_irq_restore(flags);
		}
	}

	/* Enable or disable the internal pull-ups in the GPIO ASIC block */
	for (i = 0; i < U300_GPIO_MAX; i++) {
		val = 0;
		for (j = 0; j < 8; j++)
			val |= (u32)((u300_gpio_config[i][j].pull_up == DISABLE_PULL_UP) << j);
		local_irq_save(flags);
		writel(val, virtbase + U300_GPIO_PXPER + i * U300_GPIO_PORTX_SPACING);
		local_irq_restore(flags);
	}
#endif
}

static int __init gpio_probe(struct platform_device *pdev)
{
	u32 val;
	int err = 0;
	int i;
	int num_irqs;

	gpiodev = &pdev->dev;
	memset(gpio_pin, 0, sizeof(gpio_pin));

	/* Get GPIO clock */
	clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(clk)) {
		err = PTR_ERR(clk);
		dev_err(gpiodev, "could not get GPIO clock\n");
		goto err_no_clk;
	}
	err = clk_enable(clk);
	if (err) {
		dev_err(gpiodev, "could not enable GPIO clock\n");
		goto err_no_clk_enable;
	}

	memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!memres)
		goto err_no_resource;

	if (request_mem_region(memres->start, memres->end - memres->start, "GPIO Controller")
	    == NULL) {
		err = -ENODEV;
		goto err_no_ioregion;
	}

	virtbase = ioremap(memres->start, resource_size(memres));
	if (!virtbase) {
		err = -ENOMEM;
		goto err_no_ioremap;
	}
	dev_info(gpiodev, "remapped 0x%08x to %p\n",
		 memres->start, virtbase);

#ifdef U300_COH901335
	dev_info(gpiodev, "initializing GPIO Controller COH 901 335\n");
	/* Turn on the GPIO block */
	writel(U300_GPIO_CR_BLOCK_CLOCK_ENABLE, virtbase + U300_GPIO_CR);
#endif

#ifdef U300_COH901571_3
	dev_info(gpiodev, "initializing GPIO Controller COH 901 571/3\n");
	val = readl(virtbase + U300_GPIO_CR);
	dev_info(gpiodev, "COH901571/3 block version: %d, " \
	       "number of cores: %d\n",
	       ((val & 0x0000FE00) >> 9),
	       ((val & 0x000001FC) >> 2));
	writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE, virtbase + U300_GPIO_CR);
#endif

	gpio_set_initial_values();

	for (num_irqs = 0 ; num_irqs < U300_GPIO_NUM_PORTS; num_irqs++) {

		gpio_ports[num_irqs].irq =
			platform_get_irq_byname(pdev,
						gpio_ports[num_irqs].name);

		err = request_irq(gpio_ports[num_irqs].irq,
				  gpio_irq_handler, IRQF_DISABLED,
				  gpio_ports[num_irqs].name,
				  &gpio_ports[num_irqs]);
		if (err) {
			dev_err(gpiodev, "cannot allocate IRQ for %s!\n",
				gpio_ports[num_irqs].name);
			goto err_no_irq;
		}
		/* Turns off PortX_irq_force */
		writel(0x0, virtbase + U300_GPIO_PXIFR +
				 num_irqs * U300_GPIO_PORTX_SPACING);
	}

	return 0;

 err_no_irq:
	for (i = 0; i < num_irqs; i++)
		free_irq(gpio_ports[i].irq, &gpio_ports[i]);
	iounmap(virtbase);
 err_no_ioremap:
	release_mem_region(memres->start, memres->end - memres->start);
 err_no_ioregion:
 err_no_resource:
	clk_disable(clk);
 err_no_clk_enable:
	clk_put(clk);
 err_no_clk:
	dev_info(gpiodev, "module ERROR:%d\n", err);
	return err;
}

static int __exit gpio_remove(struct platform_device *pdev)
{
	int i;

	/* Turn off the GPIO block */
	writel(0x00000000U, virtbase + U300_GPIO_CR);
	for (i = 0 ; i < U300_GPIO_NUM_PORTS; i++)
		free_irq(gpio_ports[i].irq, &gpio_ports[i]);
	iounmap(virtbase);
	release_mem_region(memres->start, memres->end - memres->start);
	clk_disable(clk);
	clk_put(clk);
	return 0;
}

static struct platform_driver gpio_driver = {
	.driver		= {
		.name	= "u300-gpio",
	},
	.remove		= __exit_p(gpio_remove),
};


static int __init u300_gpio_init(void)
{
	return platform_driver_probe(&gpio_driver, gpio_probe);
}

static void __exit u300_gpio_exit(void)
{
	platform_driver_unregister(&gpio_driver);
}

arch_initcall(u300_gpio_init);
module_exit(u300_gpio_exit);

MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");

#ifdef U300_COH901571_3
MODULE_DESCRIPTION("ST-Ericsson AB COH 901 571/3 GPIO driver");
#endif

#ifdef U300_COH901335
MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335 GPIO driver");
#endif

MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud