aboutsummaryrefslogtreecommitdiff
path: root/drivers/gpio/gpio-msc313.c
blob: da31a5ff7a2b078d1588749b9414e449c31ba655 (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
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2020 Daniel Palmer<daniel@thingy.jp> */

#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <dt-bindings/gpio/msc313-gpio.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>

#define DRIVER_NAME "gpio-msc313"

#define MSC313_GPIO_IN  BIT(0)
#define MSC313_GPIO_OUT BIT(4)
#define MSC313_GPIO_OEN BIT(5)

/*
 * These bits need to be saved to correctly restore the
 * gpio state when resuming from suspend to memory.
 */
#define MSC313_GPIO_BITSTOSAVE (MSC313_GPIO_OUT | MSC313_GPIO_OEN)

/* pad names for fuart, same for all SoCs so far */
#define MSC313_PINNAME_FUART_RX		"fuart_rx"
#define MSC313_PINNAME_FUART_TX		"fuart_tx"
#define MSC313_PINNAME_FUART_CTS	"fuart_cts"
#define MSC313_PINNAME_FUART_RTS	"fuart_rts"

/* pad names for sr, mercury5 is different */
#define MSC313_PINNAME_SR_IO2		"sr_io2"
#define MSC313_PINNAME_SR_IO3		"sr_io3"
#define MSC313_PINNAME_SR_IO4		"sr_io4"
#define MSC313_PINNAME_SR_IO5		"sr_io5"
#define MSC313_PINNAME_SR_IO6		"sr_io6"
#define MSC313_PINNAME_SR_IO7		"sr_io7"
#define MSC313_PINNAME_SR_IO8		"sr_io8"
#define MSC313_PINNAME_SR_IO9		"sr_io9"
#define MSC313_PINNAME_SR_IO10		"sr_io10"
#define MSC313_PINNAME_SR_IO11		"sr_io11"
#define MSC313_PINNAME_SR_IO12		"sr_io12"
#define MSC313_PINNAME_SR_IO13		"sr_io13"
#define MSC313_PINNAME_SR_IO14		"sr_io14"
#define MSC313_PINNAME_SR_IO15		"sr_io15"
#define MSC313_PINNAME_SR_IO16		"sr_io16"
#define MSC313_PINNAME_SR_IO17		"sr_io17"

/* pad names for sd, same for all SoCs so far */
#define MSC313_PINNAME_SD_CLK		"sd_clk"
#define MSC313_PINNAME_SD_CMD		"sd_cmd"
#define MSC313_PINNAME_SD_D0		"sd_d0"
#define MSC313_PINNAME_SD_D1		"sd_d1"
#define MSC313_PINNAME_SD_D2		"sd_d2"
#define MSC313_PINNAME_SD_D3		"sd_d3"

/* pad names for i2c1, same for all SoCs so for */
#define MSC313_PINNAME_I2C1_SCL		"i2c1_scl"
#define MSC313_PINNAME_I2C1_SCA		"i2c1_sda"

/* pad names for spi0, same for all SoCs so far */
#define MSC313_PINNAME_SPI0_CZ		"spi0_cz"
#define MSC313_PINNAME_SPI0_CK		"spi0_ck"
#define MSC313_PINNAME_SPI0_DI		"spi0_di"
#define MSC313_PINNAME_SPI0_DO		"spi0_do"

#define FUART_NAMES			\
	MSC313_PINNAME_FUART_RX,	\
	MSC313_PINNAME_FUART_TX,	\
	MSC313_PINNAME_FUART_CTS,	\
	MSC313_PINNAME_FUART_RTS

#define OFF_FUART_RX	0x50
#define OFF_FUART_TX	0x54
#define OFF_FUART_CTS	0x58
#define OFF_FUART_RTS	0x5c

#define FUART_OFFSETS	\
	OFF_FUART_RX,	\
	OFF_FUART_TX,	\
	OFF_FUART_CTS,	\
	OFF_FUART_RTS

#define SR_NAMES		\
	MSC313_PINNAME_SR_IO2,	\
	MSC313_PINNAME_SR_IO3,	\
	MSC313_PINNAME_SR_IO4,	\
	MSC313_PINNAME_SR_IO5,	\
	MSC313_PINNAME_SR_IO6,	\
	MSC313_PINNAME_SR_IO7,	\
	MSC313_PINNAME_SR_IO8,	\
	MSC313_PINNAME_SR_IO9,	\
	MSC313_PINNAME_SR_IO10,	\
	MSC313_PINNAME_SR_IO11,	\
	MSC313_PINNAME_SR_IO12,	\
	MSC313_PINNAME_SR_IO13,	\
	MSC313_PINNAME_SR_IO14,	\
	MSC313_PINNAME_SR_IO15,	\
	MSC313_PINNAME_SR_IO16,	\
	MSC313_PINNAME_SR_IO17

#define OFF_SR_IO2	0x88
#define OFF_SR_IO3	0x8c
#define OFF_SR_IO4	0x90
#define OFF_SR_IO5	0x94
#define OFF_SR_IO6	0x98
#define OFF_SR_IO7	0x9c
#define OFF_SR_IO8	0xa0
#define OFF_SR_IO9	0xa4
#define OFF_SR_IO10	0xa8
#define OFF_SR_IO11	0xac
#define OFF_SR_IO12	0xb0
#define OFF_SR_IO13	0xb4
#define OFF_SR_IO14	0xb8
#define OFF_SR_IO15	0xbc
#define OFF_SR_IO16	0xc0
#define OFF_SR_IO17	0xc4

#define SR_OFFSETS	\
	OFF_SR_IO2,	\
	OFF_SR_IO3,	\
	OFF_SR_IO4,	\
	OFF_SR_IO5,	\
	OFF_SR_IO6,	\
	OFF_SR_IO7,	\
	OFF_SR_IO8,	\
	OFF_SR_IO9,	\
	OFF_SR_IO10,	\
	OFF_SR_IO11,	\
	OFF_SR_IO12,	\
	OFF_SR_IO13,	\
	OFF_SR_IO14,	\
	OFF_SR_IO15,	\
	OFF_SR_IO16,	\
	OFF_SR_IO17

#define SD_NAMES		\
	MSC313_PINNAME_SD_CLK,	\
	MSC313_PINNAME_SD_CMD,	\
	MSC313_PINNAME_SD_D0,	\
	MSC313_PINNAME_SD_D1,	\
	MSC313_PINNAME_SD_D2,	\
	MSC313_PINNAME_SD_D3

#define OFF_SD_CLK	0x140
#define OFF_SD_CMD	0x144
#define OFF_SD_D0	0x148
#define OFF_SD_D1	0x14c
#define OFF_SD_D2	0x150
#define OFF_SD_D3	0x154

#define SD_OFFSETS	\
	OFF_SD_CLK,	\
	OFF_SD_CMD,	\
	OFF_SD_D0,	\
	OFF_SD_D1,	\
	OFF_SD_D2,	\
	OFF_SD_D3

#define I2C1_NAMES			\
	MSC313_PINNAME_I2C1_SCL,	\
	MSC313_PINNAME_I2C1_SCA

#define OFF_I2C1_SCL	0x188
#define OFF_I2C1_SCA	0x18c

#define I2C1_OFFSETS	\
	OFF_I2C1_SCL,	\
	OFF_I2C1_SCA

#define SPI0_NAMES		\
	MSC313_PINNAME_SPI0_CZ,	\
	MSC313_PINNAME_SPI0_CK,	\
	MSC313_PINNAME_SPI0_DI,	\
	MSC313_PINNAME_SPI0_DO

#define OFF_SPI0_CZ	0x1c0
#define OFF_SPI0_CK	0x1c4
#define OFF_SPI0_DI	0x1c8
#define OFF_SPI0_DO	0x1cc

#define SPI0_OFFSETS	\
	OFF_SPI0_CZ,	\
	OFF_SPI0_CK,	\
	OFF_SPI0_DI,	\
	OFF_SPI0_DO

struct msc313_gpio_data {
	const char * const *names;
	const unsigned int *offsets;
	const unsigned int num;
};

#define MSC313_GPIO_CHIPDATA(_chip) \
static const struct msc313_gpio_data _chip##_data = { \
	.names = _chip##_names, \
	.offsets = _chip##_offsets, \
	.num = ARRAY_SIZE(_chip##_offsets), \
}

#ifdef CONFIG_MACH_INFINITY
static const char * const msc313_names[] = {
	FUART_NAMES,
	SR_NAMES,
	SD_NAMES,
	I2C1_NAMES,
	SPI0_NAMES,
};

static const unsigned int msc313_offsets[] = {
	FUART_OFFSETS,
	SR_OFFSETS,
	SD_OFFSETS,
	I2C1_OFFSETS,
	SPI0_OFFSETS,
};

MSC313_GPIO_CHIPDATA(msc313);
#endif

struct msc313_gpio {
	void __iomem *base;
	const struct msc313_gpio_data *gpio_data;
	u8 *saved;
};

static void msc313_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
{
	struct msc313_gpio *gpio = gpiochip_get_data(chip);
	u8 gpioreg = readb_relaxed(gpio->base + gpio->gpio_data->offsets[offset]);

	if (value)
		gpioreg |= MSC313_GPIO_OUT;
	else
		gpioreg &= ~MSC313_GPIO_OUT;

	writeb_relaxed(gpioreg, gpio->base + gpio->gpio_data->offsets[offset]);
}

static int msc313_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	struct msc313_gpio *gpio = gpiochip_get_data(chip);

	return readb_relaxed(gpio->base + gpio->gpio_data->offsets[offset]) & MSC313_GPIO_IN;
}

static int msc313_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
{
	struct msc313_gpio *gpio = gpiochip_get_data(chip);
	u8 gpioreg = readb_relaxed(gpio->base + gpio->gpio_data->offsets[offset]);

	gpioreg |= MSC313_GPIO_OEN;
	writeb_relaxed(gpioreg, gpio->base + gpio->gpio_data->offsets[offset]);

	return 0;
}

static int msc313_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value)
{
	struct msc313_gpio *gpio = gpiochip_get_data(chip);
	u8 gpioreg = readb_relaxed(gpio->base + gpio->gpio_data->offsets[offset]);

	gpioreg &= ~MSC313_GPIO_OEN;
	if (value)
		gpioreg |= MSC313_GPIO_OUT;
	else
		gpioreg &= ~MSC313_GPIO_OUT;
	writeb_relaxed(gpioreg, gpio->base + gpio->gpio_data->offsets[offset]);

	return 0;
}

/*
 * The interrupt handling happens in the parent interrupt controller,
 * we don't do anything here.
 */
static struct irq_chip msc313_gpio_irqchip = {
	.name = "GPIO",
	.irq_eoi = irq_chip_eoi_parent,
	.irq_mask = irq_chip_mask_parent,
	.irq_unmask = irq_chip_unmask_parent,
	.irq_set_type = irq_chip_set_type_parent,
	.irq_set_affinity = irq_chip_set_affinity_parent,
};

/*
 * The parent interrupt controller needs the GIC interrupt type set to GIC_SPI
 * so we need to provide the fwspec. Essentially gpiochip_populate_parent_fwspec_twocell
 * that puts GIC_SPI into the first cell.
 */
static void *msc313_gpio_populate_parent_fwspec(struct gpio_chip *gc,
					     unsigned int parent_hwirq,
					     unsigned int parent_type)
{
	struct irq_fwspec *fwspec;

	fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL);
	if (!fwspec)
		return NULL;

	fwspec->fwnode = gc->irq.parent_domain->fwnode;
	fwspec->param_count = 3;
	fwspec->param[0] = GIC_SPI;
	fwspec->param[1] = parent_hwirq;
	fwspec->param[2] = parent_type;

	return fwspec;
}

static int msc313e_gpio_child_to_parent_hwirq(struct gpio_chip *chip,
					     unsigned int child,
					     unsigned int child_type,
					     unsigned int *parent,
					     unsigned int *parent_type)
{
	struct msc313_gpio *priv = gpiochip_get_data(chip);
	unsigned int offset = priv->gpio_data->offsets[child];

	/*
	 * only the spi0 pins have interrupts on the parent
	 * on all of the known chips and so far they are all
	 * mapped to the same place
	 */
	if (offset >= OFF_SPI0_CZ && offset <= OFF_SPI0_DO) {
		*parent_type = child_type;
		*parent = ((offset - OFF_SPI0_CZ) >> 2) + 28;
		return 0;
	}

	return -EINVAL;
}

static int msc313_gpio_probe(struct platform_device *pdev)
{
	const struct msc313_gpio_data *match_data;
	struct msc313_gpio *gpio;
	struct gpio_chip *gpiochip;
	struct gpio_irq_chip *gpioirqchip;
	struct irq_domain *parent_domain;
	struct device_node *parent_node;
	struct device *dev = &pdev->dev;
	int ret;

	match_data = of_device_get_match_data(dev);
	if (!match_data)
		return -EINVAL;

	parent_node = of_irq_find_parent(dev->of_node);
	if (!parent_node)
		return -ENODEV;

	parent_domain = irq_find_host(parent_node);
	if (!parent_domain)
		return -ENODEV;

	gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL);
	if (!gpio)
		return -ENOMEM;

	gpio->gpio_data = match_data;

	gpio->saved = devm_kcalloc(dev, gpio->gpio_data->num, sizeof(*gpio->saved), GFP_KERNEL);
	if (!gpio->saved)
		return -ENOMEM;

	gpio->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(gpio->base))
		return PTR_ERR(gpio->base);

	platform_set_drvdata(pdev, gpio);

	gpiochip = devm_kzalloc(dev, sizeof(*gpiochip), GFP_KERNEL);
	if (!gpiochip)
		return -ENOMEM;

	gpiochip->label = DRIVER_NAME;
	gpiochip->parent = dev;
	gpiochip->request = gpiochip_generic_request;
	gpiochip->free = gpiochip_generic_free;
	gpiochip->direction_input = msc313_gpio_direction_input;
	gpiochip->direction_output = msc313_gpio_direction_output;
	gpiochip->get = msc313_gpio_get;
	gpiochip->set = msc313_gpio_set;
	gpiochip->base = -1;
	gpiochip->ngpio = gpio->gpio_data->num;
	gpiochip->names = gpio->gpio_data->names;

	gpioirqchip = &gpiochip->irq;
	gpioirqchip->chip = &msc313_gpio_irqchip;
	gpioirqchip->fwnode = of_node_to_fwnode(dev->of_node);
	gpioirqchip->parent_domain = parent_domain;
	gpioirqchip->child_to_parent_hwirq = msc313e_gpio_child_to_parent_hwirq;
	gpioirqchip->populate_parent_alloc_arg = msc313_gpio_populate_parent_fwspec;
	gpioirqchip->handler = handle_bad_irq;
	gpioirqchip->default_type = IRQ_TYPE_NONE;

	ret = devm_gpiochip_add_data(dev, gpiochip, gpio);
	return ret;
}

static int msc313_gpio_remove(struct platform_device *pdev)
{
	return 0;
}

static const struct of_device_id msc313_gpio_of_match[] = {
#ifdef CONFIG_MACH_INFINITY
	{
		.compatible = "mstar,msc313-gpio",
		.data = &msc313_data,
	},
#endif
	{ }
};

/*
 * The GPIO controller loses the state of the registers when the
 * SoC goes into suspend to memory mode so we need to save some
 * of the register bits before suspending and put it back when resuming
 */
static int __maybe_unused msc313_gpio_suspend(struct device *dev)
{
	struct msc313_gpio *gpio = dev_get_drvdata(dev);
	int i;

	for (i = 0; i < gpio->gpio_data->num; i++)
		gpio->saved[i] = readb_relaxed(gpio->base + gpio->gpio_data->offsets[i]) & MSC313_GPIO_BITSTOSAVE;

	return 0;
}

static int __maybe_unused msc313_gpio_resume(struct device *dev)
{
	struct msc313_gpio *gpio = dev_get_drvdata(dev);
	int i;

	for (i = 0; i < gpio->gpio_data->num; i++)
		writeb_relaxed(gpio->saved[i], gpio->base + gpio->gpio_data->offsets[i]);

	return 0;
}

static SIMPLE_DEV_PM_OPS(msc313_gpio_ops, msc313_gpio_suspend, msc313_gpio_resume);

static struct platform_driver msc313_gpio_driver = {
	.driver = {
		.name = DRIVER_NAME,
		.of_match_table = msc313_gpio_of_match,
		.pm = &msc313_gpio_ops,
	},
	.probe = msc313_gpio_probe,
	.remove = msc313_gpio_remove,
};

builtin_platform_driver(msc313_gpio_driver);