aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/gpio/gpio-merrifield.c
blob: 2f1e9da81c1e422644e1611fd5c43b6a14cc0b85 (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
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
// SPDX-License-Identifier: GPL-2.0
/*
 * Intel Merrifield SoC GPIO driver
 *
 * Copyright (c) 2016 Intel Corporation.
 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
 */

#include <linux/acpi.h>
#include <linux/bitops.h>
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pinctrl/consumer.h>

#define GCCR		0x000	/* controller configuration */
#define GPLR		0x004	/* pin level r/o */
#define GPDR		0x01c	/* pin direction */
#define GPSR		0x034	/* pin set w/o */
#define GPCR		0x04c	/* pin clear w/o */
#define GRER		0x064	/* rising edge detect */
#define GFER		0x07c	/* falling edge detect */
#define GFBR		0x094	/* glitch filter bypass */
#define GIMR		0x0ac	/* interrupt mask */
#define GISR		0x0c4	/* interrupt source */
#define GITR		0x300	/* input type */
#define GLPR		0x318	/* level input polarity */
#define GWMR		0x400	/* wake mask */
#define GWSR		0x418	/* wake source */
#define GSIR		0xc00	/* secure input */

/* Intel Merrifield has 192 GPIO pins */
#define MRFLD_NGPIO	192

struct mrfld_gpio_pinrange {
	unsigned int gpio_base;
	unsigned int pin_base;
	unsigned int npins;
};

#define GPIO_PINRANGE(gstart, gend, pstart)		\
	{						\
		.gpio_base = (gstart),			\
		.pin_base = (pstart),			\
		.npins = (gend) - (gstart) + 1,		\
	}

struct mrfld_gpio {
	struct gpio_chip	chip;
	void __iomem		*reg_base;
	raw_spinlock_t		lock;
	struct device		*dev;
};

static const struct mrfld_gpio_pinrange mrfld_gpio_ranges[] = {
	GPIO_PINRANGE(0, 11, 146),
	GPIO_PINRANGE(12, 13, 144),
	GPIO_PINRANGE(14, 15, 35),
	GPIO_PINRANGE(16, 16, 164),
	GPIO_PINRANGE(17, 18, 105),
	GPIO_PINRANGE(19, 22, 101),
	GPIO_PINRANGE(23, 30, 107),
	GPIO_PINRANGE(32, 43, 67),
	GPIO_PINRANGE(44, 63, 195),
	GPIO_PINRANGE(64, 67, 140),
	GPIO_PINRANGE(68, 69, 165),
	GPIO_PINRANGE(70, 71, 65),
	GPIO_PINRANGE(72, 76, 228),
	GPIO_PINRANGE(77, 86, 37),
	GPIO_PINRANGE(87, 87, 48),
	GPIO_PINRANGE(88, 88, 47),
	GPIO_PINRANGE(89, 96, 49),
	GPIO_PINRANGE(97, 97, 34),
	GPIO_PINRANGE(102, 119, 83),
	GPIO_PINRANGE(120, 123, 79),
	GPIO_PINRANGE(124, 135, 115),
	GPIO_PINRANGE(137, 142, 158),
	GPIO_PINRANGE(154, 163, 24),
	GPIO_PINRANGE(164, 176, 215),
	GPIO_PINRANGE(177, 189, 127),
	GPIO_PINRANGE(190, 191, 178),
};

static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned int offset,
			      unsigned int reg_type_offset)
{
	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	u8 reg = offset / 32;

	return priv->reg_base + reg_type_offset + reg * 4;
}

static int mrfld_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	void __iomem *gplr = gpio_reg(chip, offset, GPLR);

	return !!(readl(gplr) & BIT(offset % 32));
}

static void mrfld_gpio_set(struct gpio_chip *chip, unsigned int offset,
			   int value)
{
	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	void __iomem *gpsr, *gpcr;
	unsigned long flags;

	raw_spin_lock_irqsave(&priv->lock, flags);

	if (value) {
		gpsr = gpio_reg(chip, offset, GPSR);
		writel(BIT(offset % 32), gpsr);
	} else {
		gpcr = gpio_reg(chip, offset, GPCR);
		writel(BIT(offset % 32), gpcr);
	}

	raw_spin_unlock_irqrestore(&priv->lock, flags);
}

static int mrfld_gpio_direction_input(struct gpio_chip *chip,
				      unsigned int offset)
{
	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&priv->lock, flags);

	value = readl(gpdr);
	value &= ~BIT(offset % 32);
	writel(value, gpdr);

	raw_spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

static int mrfld_gpio_direction_output(struct gpio_chip *chip,
				       unsigned int offset, int value)
{
	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
	unsigned long flags;

	mrfld_gpio_set(chip, offset, value);

	raw_spin_lock_irqsave(&priv->lock, flags);

	value = readl(gpdr);
	value |= BIT(offset % 32);
	writel(value, gpdr);

	raw_spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

static int mrfld_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
{
	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);

	return !(readl(gpdr) & BIT(offset % 32));
}

static int mrfld_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
				   unsigned int debounce)
{
	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	void __iomem *gfbr = gpio_reg(chip, offset, GFBR);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&priv->lock, flags);

	if (debounce)
		value = readl(gfbr) & ~BIT(offset % 32);
	else
		value = readl(gfbr) | BIT(offset % 32);
	writel(value, gfbr);

	raw_spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

static int mrfld_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
				 unsigned long config)
{
	u32 debounce;

	if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
		return -ENOTSUPP;

	debounce = pinconf_to_config_argument(config);
	return mrfld_gpio_set_debounce(chip, offset, debounce);
}

static void mrfld_irq_ack(struct irq_data *d)
{
	struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
	u32 gpio = irqd_to_hwirq(d);
	void __iomem *gisr = gpio_reg(&priv->chip, gpio, GISR);
	unsigned long flags;

	raw_spin_lock_irqsave(&priv->lock, flags);

	writel(BIT(gpio % 32), gisr);

	raw_spin_unlock_irqrestore(&priv->lock, flags);
}

static void mrfld_irq_unmask_mask(struct irq_data *d, bool unmask)
{
	struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
	u32 gpio = irqd_to_hwirq(d);
	void __iomem *gimr = gpio_reg(&priv->chip, gpio, GIMR);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&priv->lock, flags);

	if (unmask)
		value = readl(gimr) | BIT(gpio % 32);
	else
		value = readl(gimr) & ~BIT(gpio % 32);
	writel(value, gimr);

	raw_spin_unlock_irqrestore(&priv->lock, flags);
}

static void mrfld_irq_mask(struct irq_data *d)
{
	mrfld_irq_unmask_mask(d, false);
}

static void mrfld_irq_unmask(struct irq_data *d)
{
	mrfld_irq_unmask_mask(d, true);
}

static int mrfld_irq_set_type(struct irq_data *d, unsigned int type)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct mrfld_gpio *priv = gpiochip_get_data(gc);
	u32 gpio = irqd_to_hwirq(d);
	void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER);
	void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER);
	void __iomem *gitr = gpio_reg(&priv->chip, gpio, GITR);
	void __iomem *glpr = gpio_reg(&priv->chip, gpio, GLPR);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&priv->lock, flags);

	if (type & IRQ_TYPE_EDGE_RISING)
		value = readl(grer) | BIT(gpio % 32);
	else
		value = readl(grer) & ~BIT(gpio % 32);
	writel(value, grer);

	if (type & IRQ_TYPE_EDGE_FALLING)
		value = readl(gfer) | BIT(gpio % 32);
	else
		value = readl(gfer) & ~BIT(gpio % 32);
	writel(value, gfer);

	/*
	 * To prevent glitches from triggering an unintended level interrupt,
	 * configure GLPR register first and then configure GITR.
	 */
	if (type & IRQ_TYPE_LEVEL_LOW)
		value = readl(glpr) | BIT(gpio % 32);
	else
		value = readl(glpr) & ~BIT(gpio % 32);
	writel(value, glpr);

	if (type & IRQ_TYPE_LEVEL_MASK) {
		value = readl(gitr) | BIT(gpio % 32);
		writel(value, gitr);

		irq_set_handler_locked(d, handle_level_irq);
	} else if (type & IRQ_TYPE_EDGE_BOTH) {
		value = readl(gitr) & ~BIT(gpio % 32);
		writel(value, gitr);

		irq_set_handler_locked(d, handle_edge_irq);
	}

	raw_spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

static int mrfld_irq_set_wake(struct irq_data *d, unsigned int on)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct mrfld_gpio *priv = gpiochip_get_data(gc);
	u32 gpio = irqd_to_hwirq(d);
	void __iomem *gwmr = gpio_reg(&priv->chip, gpio, GWMR);
	void __iomem *gwsr = gpio_reg(&priv->chip, gpio, GWSR);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&priv->lock, flags);

	/* Clear the existing wake status */
	writel(BIT(gpio % 32), gwsr);

	if (on)
		value = readl(gwmr) | BIT(gpio % 32);
	else
		value = readl(gwmr) & ~BIT(gpio % 32);
	writel(value, gwmr);

	raw_spin_unlock_irqrestore(&priv->lock, flags);

	dev_dbg(priv->dev, "%sable wake for gpio %u\n", on ? "en" : "dis", gpio);
	return 0;
}

static struct irq_chip mrfld_irqchip = {
	.name		= "gpio-merrifield",
	.irq_ack	= mrfld_irq_ack,
	.irq_mask	= mrfld_irq_mask,
	.irq_unmask	= mrfld_irq_unmask,
	.irq_set_type	= mrfld_irq_set_type,
	.irq_set_wake	= mrfld_irq_set_wake,
};

static void mrfld_irq_handler(struct irq_desc *desc)
{
	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
	struct mrfld_gpio *priv = gpiochip_get_data(gc);
	struct irq_chip *irqchip = irq_desc_get_chip(desc);
	unsigned long base, gpio;

	chained_irq_enter(irqchip, desc);

	/* Check GPIO controller to check which pin triggered the interrupt */
	for (base = 0; base < priv->chip.ngpio; base += 32) {
		void __iomem *gisr = gpio_reg(&priv->chip, base, GISR);
		void __iomem *gimr = gpio_reg(&priv->chip, base, GIMR);
		unsigned long pending, enabled;

		pending = readl(gisr);
		enabled = readl(gimr);

		/* Only interrupts that are enabled */
		pending &= enabled;

		for_each_set_bit(gpio, &pending, 32) {
			unsigned int irq;

			irq = irq_find_mapping(gc->irq.domain, base + gpio);
			generic_handle_irq(irq);
		}
	}

	chained_irq_exit(irqchip, desc);
}

static int mrfld_irq_init_hw(struct gpio_chip *chip)
{
	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	void __iomem *reg;
	unsigned int base;

	for (base = 0; base < priv->chip.ngpio; base += 32) {
		/* Clear the rising-edge detect register */
		reg = gpio_reg(&priv->chip, base, GRER);
		writel(0, reg);
		/* Clear the falling-edge detect register */
		reg = gpio_reg(&priv->chip, base, GFER);
		writel(0, reg);
	}

	return 0;
}

static const char *mrfld_gpio_get_pinctrl_dev_name(struct mrfld_gpio *priv)
{
	struct acpi_device *adev;
	const char *name;

	adev = acpi_dev_get_first_match_dev("INTC1002", NULL, -1);
	if (adev) {
		name = devm_kstrdup(priv->dev, acpi_dev_name(adev), GFP_KERNEL);
		acpi_dev_put(adev);
	} else {
		name = "pinctrl-merrifield";
	}

	return name;
}

static int mrfld_gpio_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	const struct mrfld_gpio_pinrange *range;
	const char *pinctrl_dev_name;
	struct gpio_irq_chip *girq;
	struct mrfld_gpio *priv;
	u32 gpio_base, irq_base;
	void __iomem *base;
	unsigned int i;
	int retval;

	retval = pcim_enable_device(pdev);
	if (retval)
		return retval;

	retval = pcim_iomap_regions(pdev, BIT(1) | BIT(0), pci_name(pdev));
	if (retval) {
		dev_err(&pdev->dev, "I/O memory mapping error\n");
		return retval;
	}

	base = pcim_iomap_table(pdev)[1];

	irq_base = readl(base);
	gpio_base = readl(sizeof(u32) + base);

	/* Release the IO mapping, since we already get the info from BAR1 */
	pcim_iounmap_regions(pdev, BIT(1));

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->dev = &pdev->dev;
	priv->reg_base = pcim_iomap_table(pdev)[0];

	priv->chip.label = dev_name(&pdev->dev);
	priv->chip.parent = &pdev->dev;
	priv->chip.request = gpiochip_generic_request;
	priv->chip.free = gpiochip_generic_free;
	priv->chip.direction_input = mrfld_gpio_direction_input;
	priv->chip.direction_output = mrfld_gpio_direction_output;
	priv->chip.get = mrfld_gpio_get;
	priv->chip.set = mrfld_gpio_set;
	priv->chip.get_direction = mrfld_gpio_get_direction;
	priv->chip.set_config = mrfld_gpio_set_config;
	priv->chip.base = gpio_base;
	priv->chip.ngpio = MRFLD_NGPIO;
	priv->chip.can_sleep = false;

	raw_spin_lock_init(&priv->lock);

	girq = &priv->chip.irq;
	girq->chip = &mrfld_irqchip;
	girq->init_hw = mrfld_irq_init_hw;
	girq->parent_handler = mrfld_irq_handler;
	girq->num_parents = 1;
	girq->parents = devm_kcalloc(&pdev->dev, girq->num_parents,
				     sizeof(*girq->parents),
				     GFP_KERNEL);
	if (!girq->parents)
		return -ENOMEM;
	girq->parents[0] = pdev->irq;
	girq->first = irq_base;
	girq->default_type = IRQ_TYPE_NONE;
	girq->handler = handle_bad_irq;

	pci_set_drvdata(pdev, priv);
	retval = devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv);
	if (retval) {
		dev_err(&pdev->dev, "gpiochip_add error %d\n", retval);
		return retval;
	}

	pinctrl_dev_name = mrfld_gpio_get_pinctrl_dev_name(priv);
	for (i = 0; i < ARRAY_SIZE(mrfld_gpio_ranges); i++) {
		range = &mrfld_gpio_ranges[i];
		retval = gpiochip_add_pin_range(&priv->chip,
						pinctrl_dev_name,
						range->gpio_base,
						range->pin_base,
						range->npins);
		if (retval) {
			dev_err(&pdev->dev, "failed to add GPIO pin range\n");
			return retval;
		}
	}

	return 0;
}

static const struct pci_device_id mrfld_gpio_ids[] = {
	{ PCI_VDEVICE(INTEL, 0x1199) },
	{ }
};
MODULE_DEVICE_TABLE(pci, mrfld_gpio_ids);

static struct pci_driver mrfld_gpio_driver = {
	.name		= "gpio-merrifield",
	.id_table	= mrfld_gpio_ids,
	.probe		= mrfld_gpio_probe,
};

module_pci_driver(mrfld_gpio_driver);

MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
MODULE_DESCRIPTION("Intel Merrifield SoC GPIO driver");
MODULE_LICENSE("GPL v2");