Free Electrons

Embedded Linux Experts

  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
/*
 * arch/arm/mach-lpc32xx/gpiolib.c
 *
 * Author: Kevin Wells <kevin.wells@nxp.com>
 *
 * Copyright (C) 2010 NXP Semiconductors
 *
 * 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.
 *
 * 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/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/gpio.h>

#include <mach/hardware.h>
#include <mach/platform.h>
#include <mach/gpio-lpc32xx.h>

#define LPC32XX_GPIO_P3_INP_STATE		_GPREG(0x000)
#define LPC32XX_GPIO_P3_OUTP_SET		_GPREG(0x004)
#define LPC32XX_GPIO_P3_OUTP_CLR		_GPREG(0x008)
#define LPC32XX_GPIO_P3_OUTP_STATE		_GPREG(0x00C)
#define LPC32XX_GPIO_P2_DIR_SET			_GPREG(0x010)
#define LPC32XX_GPIO_P2_DIR_CLR			_GPREG(0x014)
#define LPC32XX_GPIO_P2_DIR_STATE		_GPREG(0x018)
#define LPC32XX_GPIO_P2_INP_STATE		_GPREG(0x01C)
#define LPC32XX_GPIO_P2_OUTP_SET		_GPREG(0x020)
#define LPC32XX_GPIO_P2_OUTP_CLR		_GPREG(0x024)
#define LPC32XX_GPIO_P2_MUX_SET			_GPREG(0x028)
#define LPC32XX_GPIO_P2_MUX_CLR			_GPREG(0x02C)
#define LPC32XX_GPIO_P2_MUX_STATE		_GPREG(0x030)
#define LPC32XX_GPIO_P0_INP_STATE		_GPREG(0x040)
#define LPC32XX_GPIO_P0_OUTP_SET		_GPREG(0x044)
#define LPC32XX_GPIO_P0_OUTP_CLR		_GPREG(0x048)
#define LPC32XX_GPIO_P0_OUTP_STATE		_GPREG(0x04C)
#define LPC32XX_GPIO_P0_DIR_SET			_GPREG(0x050)
#define LPC32XX_GPIO_P0_DIR_CLR			_GPREG(0x054)
#define LPC32XX_GPIO_P0_DIR_STATE		_GPREG(0x058)
#define LPC32XX_GPIO_P1_INP_STATE		_GPREG(0x060)
#define LPC32XX_GPIO_P1_OUTP_SET		_GPREG(0x064)
#define LPC32XX_GPIO_P1_OUTP_CLR		_GPREG(0x068)
#define LPC32XX_GPIO_P1_OUTP_STATE		_GPREG(0x06C)
#define LPC32XX_GPIO_P1_DIR_SET			_GPREG(0x070)
#define LPC32XX_GPIO_P1_DIR_CLR			_GPREG(0x074)
#define LPC32XX_GPIO_P1_DIR_STATE		_GPREG(0x078)

#define GPIO012_PIN_TO_BIT(x)			(1 << (x))
#define GPIO3_PIN_TO_BIT(x)			(1 << ((x) + 25))
#define GPO3_PIN_TO_BIT(x)			(1 << (x))
#define GPIO012_PIN_IN_SEL(x, y)		(((x) >> (y)) & 1)
#define GPIO3_PIN_IN_SHIFT(x)			((x) == 5 ? 24 : 10 + (x))
#define GPIO3_PIN_IN_SEL(x, y)			(((x) >> GPIO3_PIN_IN_SHIFT(y)) & 1)
#define GPIO3_PIN5_IN_SEL(x)			(((x) >> 24) & 1)
#define GPI3_PIN_IN_SEL(x, y)			(((x) >> (y)) & 1)
#define GPO3_PIN_IN_SEL(x, y)			(((x) >> (y)) & 1)

struct gpio_regs {
	void __iomem *inp_state;
	void __iomem *outp_state;
	void __iomem *outp_set;
	void __iomem *outp_clr;
	void __iomem *dir_set;
	void __iomem *dir_clr;
};

/*
 * GPIO names
 */
static const char *gpio_p0_names[LPC32XX_GPIO_P0_MAX] = {
	"p0.0", "p0.1", "p0.2", "p0.3",
	"p0.4", "p0.5", "p0.6", "p0.7"
};

static const char *gpio_p1_names[LPC32XX_GPIO_P1_MAX] = {
	"p1.0", "p1.1", "p1.2", "p1.3",
	"p1.4", "p1.5", "p1.6", "p1.7",
	"p1.8", "p1.9", "p1.10", "p1.11",
	"p1.12", "p1.13", "p1.14", "p1.15",
	"p1.16", "p1.17", "p1.18", "p1.19",
	"p1.20", "p1.21", "p1.22", "p1.23",
};

static const char *gpio_p2_names[LPC32XX_GPIO_P2_MAX] = {
	"p2.0", "p2.1", "p2.2", "p2.3",
	"p2.4", "p2.5", "p2.6", "p2.7",
	"p2.8", "p2.9", "p2.10", "p2.11",
	"p2.12"
};

static const char *gpio_p3_names[LPC32XX_GPIO_P3_MAX] = {
	"gpio00", "gpio01", "gpio02", "gpio03",
	"gpio04", "gpio05"
};

static const char *gpi_p3_names[LPC32XX_GPI_P3_MAX] = {
	"gpi00", "gpi01", "gpi02", "gpi03",
	"gpi04", "gpi05", "gpi06", "gpi07",
	"gpi08", "gpi09",  NULL,    NULL,
	 NULL,    NULL,    NULL,   "gpi15",
	"gpi16", "gpi17", "gpi18", "gpi19",
	"gpi20", "gpi21", "gpi22", "gpi23",
	"gpi24", "gpi25", "gpi26", "gpi27"
};

static const char *gpo_p3_names[LPC32XX_GPO_P3_MAX] = {
	"gpo00", "gpo01", "gpo02", "gpo03",
	"gpo04", "gpo05", "gpo06", "gpo07",
	"gpo08", "gpo09", "gpo10", "gpo11",
	"gpo12", "gpo13", "gpo14", "gpo15",
	"gpo16", "gpo17", "gpo18", "gpo19",
	"gpo20", "gpo21", "gpo22", "gpo23"
};

static struct gpio_regs gpio_grp_regs_p0 = {
	.inp_state	= LPC32XX_GPIO_P0_INP_STATE,
	.outp_set	= LPC32XX_GPIO_P0_OUTP_SET,
	.outp_clr	= LPC32XX_GPIO_P0_OUTP_CLR,
	.dir_set	= LPC32XX_GPIO_P0_DIR_SET,
	.dir_clr	= LPC32XX_GPIO_P0_DIR_CLR,
};

static struct gpio_regs gpio_grp_regs_p1 = {
	.inp_state	= LPC32XX_GPIO_P1_INP_STATE,
	.outp_set	= LPC32XX_GPIO_P1_OUTP_SET,
	.outp_clr	= LPC32XX_GPIO_P1_OUTP_CLR,
	.dir_set	= LPC32XX_GPIO_P1_DIR_SET,
	.dir_clr	= LPC32XX_GPIO_P1_DIR_CLR,
};

static struct gpio_regs gpio_grp_regs_p2 = {
	.inp_state	= LPC32XX_GPIO_P2_INP_STATE,
	.outp_set	= LPC32XX_GPIO_P2_OUTP_SET,
	.outp_clr	= LPC32XX_GPIO_P2_OUTP_CLR,
	.dir_set	= LPC32XX_GPIO_P2_DIR_SET,
	.dir_clr	= LPC32XX_GPIO_P2_DIR_CLR,
};

static struct gpio_regs gpio_grp_regs_p3 = {
	.inp_state	= LPC32XX_GPIO_P3_INP_STATE,
	.outp_state	= LPC32XX_GPIO_P3_OUTP_STATE,
	.outp_set	= LPC32XX_GPIO_P3_OUTP_SET,
	.outp_clr	= LPC32XX_GPIO_P3_OUTP_CLR,
	.dir_set	= LPC32XX_GPIO_P2_DIR_SET,
	.dir_clr	= LPC32XX_GPIO_P2_DIR_CLR,
};

struct lpc32xx_gpio_chip {
	struct gpio_chip	chip;
	struct gpio_regs	*gpio_grp;
};

static inline struct lpc32xx_gpio_chip *to_lpc32xx_gpio(
	struct gpio_chip *gpc)
{
	return container_of(gpc, struct lpc32xx_gpio_chip, chip);
}

static void __set_gpio_dir_p012(struct lpc32xx_gpio_chip *group,
	unsigned pin, int input)
{
	if (input)
		__raw_writel(GPIO012_PIN_TO_BIT(pin),
			group->gpio_grp->dir_clr);
	else
		__raw_writel(GPIO012_PIN_TO_BIT(pin),
			group->gpio_grp->dir_set);
}

static void __set_gpio_dir_p3(struct lpc32xx_gpio_chip *group,
	unsigned pin, int input)
{
	u32 u = GPIO3_PIN_TO_BIT(pin);

	if (input)
		__raw_writel(u, group->gpio_grp->dir_clr);
	else
		__raw_writel(u, group->gpio_grp->dir_set);
}

static void __set_gpio_level_p012(struct lpc32xx_gpio_chip *group,
	unsigned pin, int high)
{
	if (high)
		__raw_writel(GPIO012_PIN_TO_BIT(pin),
			group->gpio_grp->outp_set);
	else
		__raw_writel(GPIO012_PIN_TO_BIT(pin),
			group->gpio_grp->outp_clr);
}

static void __set_gpio_level_p3(struct lpc32xx_gpio_chip *group,
	unsigned pin, int high)
{
	u32 u = GPIO3_PIN_TO_BIT(pin);

	if (high)
		__raw_writel(u, group->gpio_grp->outp_set);
	else
		__raw_writel(u, group->gpio_grp->outp_clr);
}

static void __set_gpo_level_p3(struct lpc32xx_gpio_chip *group,
	unsigned pin, int high)
{
	if (high)
		__raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_set);
	else
		__raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_clr);
}

static int __get_gpio_state_p012(struct lpc32xx_gpio_chip *group,
	unsigned pin)
{
	return GPIO012_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state),
		pin);
}

static int __get_gpio_state_p3(struct lpc32xx_gpio_chip *group,
	unsigned pin)
{
	int state = __raw_readl(group->gpio_grp->inp_state);

	/*
	 * P3 GPIO pin input mapping is not contiguous, GPIOP3-0..4 is mapped
	 * to bits 10..14, while GPIOP3-5 is mapped to bit 24.
	 */
	return GPIO3_PIN_IN_SEL(state, pin);
}

static int __get_gpi_state_p3(struct lpc32xx_gpio_chip *group,
	unsigned pin)
{
	return GPI3_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state), pin);
}

static int __get_gpo_state_p3(struct lpc32xx_gpio_chip *group,
	unsigned pin)
{
	return GPO3_PIN_IN_SEL(__raw_readl(group->gpio_grp->outp_state), pin);
}

/*
 * GENERIC_GPIO primitives.
 */
static int lpc32xx_gpio_dir_input_p012(struct gpio_chip *chip,
	unsigned pin)
{
	struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);

	__set_gpio_dir_p012(group, pin, 1);

	return 0;
}

static int lpc32xx_gpio_dir_input_p3(struct gpio_chip *chip,
	unsigned pin)
{
	struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);

	__set_gpio_dir_p3(group, pin, 1);

	return 0;
}

static int lpc32xx_gpio_dir_in_always(struct gpio_chip *chip,
	unsigned pin)
{
	return 0;
}

static int lpc32xx_gpio_get_value_p012(struct gpio_chip *chip, unsigned pin)
{
	struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);

	return __get_gpio_state_p012(group, pin);
}

static int lpc32xx_gpio_get_value_p3(struct gpio_chip *chip, unsigned pin)
{
	struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);

	return __get_gpio_state_p3(group, pin);
}

static int lpc32xx_gpi_get_value(struct gpio_chip *chip, unsigned pin)
{
	struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);

	return __get_gpi_state_p3(group, pin);
}

static int lpc32xx_gpio_dir_output_p012(struct gpio_chip *chip, unsigned pin,
	int value)
{
	struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);

	__set_gpio_dir_p012(group, pin, 0);

	return 0;
}

static int lpc32xx_gpio_dir_output_p3(struct gpio_chip *chip, unsigned pin,
	int value)
{
	struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);

	__set_gpio_dir_p3(group, pin, 0);

	return 0;
}

static int lpc32xx_gpio_dir_out_always(struct gpio_chip *chip, unsigned pin,
	int value)
{
	return 0;
}

static void lpc32xx_gpio_set_value_p012(struct gpio_chip *chip, unsigned pin,
	int value)
{
	struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);

	__set_gpio_level_p012(group, pin, value);
}

static void lpc32xx_gpio_set_value_p3(struct gpio_chip *chip, unsigned pin,
	int value)
{
	struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);

	__set_gpio_level_p3(group, pin, value);
}

static void lpc32xx_gpo_set_value(struct gpio_chip *chip, unsigned pin,
	int value)
{
	struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);

	__set_gpo_level_p3(group, pin, value);
}

static int lpc32xx_gpo_get_value(struct gpio_chip *chip, unsigned pin)
{
	struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);

	return __get_gpo_state_p3(group, pin);
}

static int lpc32xx_gpio_request(struct gpio_chip *chip, unsigned pin)
{
	if (pin < chip->ngpio)
		return 0;

	return -EINVAL;
}

static struct lpc32xx_gpio_chip lpc32xx_gpiochip[] = {
	{
		.chip = {
			.label			= "gpio_p0",
			.direction_input	= lpc32xx_gpio_dir_input_p012,
			.get			= lpc32xx_gpio_get_value_p012,
			.direction_output	= lpc32xx_gpio_dir_output_p012,
			.set			= lpc32xx_gpio_set_value_p012,
			.request		= lpc32xx_gpio_request,
			.base			= LPC32XX_GPIO_P0_GRP,
			.ngpio			= LPC32XX_GPIO_P0_MAX,
			.names			= gpio_p0_names,
			.can_sleep		= 0,
		},
		.gpio_grp = &gpio_grp_regs_p0,
	},
	{
		.chip = {
			.label			= "gpio_p1",
			.direction_input	= lpc32xx_gpio_dir_input_p012,
			.get			= lpc32xx_gpio_get_value_p012,
			.direction_output	= lpc32xx_gpio_dir_output_p012,
			.set			= lpc32xx_gpio_set_value_p012,
			.request		= lpc32xx_gpio_request,
			.base			= LPC32XX_GPIO_P1_GRP,
			.ngpio			= LPC32XX_GPIO_P1_MAX,
			.names			= gpio_p1_names,
			.can_sleep		= 0,
		},
		.gpio_grp = &gpio_grp_regs_p1,
	},
	{
		.chip = {
			.label			= "gpio_p2",
			.direction_input	= lpc32xx_gpio_dir_input_p012,
			.get			= lpc32xx_gpio_get_value_p012,
			.direction_output	= lpc32xx_gpio_dir_output_p012,
			.set			= lpc32xx_gpio_set_value_p012,
			.request		= lpc32xx_gpio_request,
			.base			= LPC32XX_GPIO_P2_GRP,
			.ngpio			= LPC32XX_GPIO_P2_MAX,
			.names			= gpio_p2_names,
			.can_sleep		= 0,
		},
		.gpio_grp = &gpio_grp_regs_p2,
	},
	{
		.chip = {
			.label			= "gpio_p3",
			.direction_input	= lpc32xx_gpio_dir_input_p3,
			.get			= lpc32xx_gpio_get_value_p3,
			.direction_output	= lpc32xx_gpio_dir_output_p3,
			.set			= lpc32xx_gpio_set_value_p3,
			.request		= lpc32xx_gpio_request,
			.base			= LPC32XX_GPIO_P3_GRP,
			.ngpio			= LPC32XX_GPIO_P3_MAX,
			.names			= gpio_p3_names,
			.can_sleep		= 0,
		},
		.gpio_grp = &gpio_grp_regs_p3,
	},
	{
		.chip = {
			.label			= "gpi_p3",
			.direction_input	= lpc32xx_gpio_dir_in_always,
			.get			= lpc32xx_gpi_get_value,
			.request		= lpc32xx_gpio_request,
			.base			= LPC32XX_GPI_P3_GRP,
			.ngpio			= LPC32XX_GPI_P3_MAX,
			.names			= gpi_p3_names,
			.can_sleep		= 0,
		},
		.gpio_grp = &gpio_grp_regs_p3,
	},
	{
		.chip = {
			.label			= "gpo_p3",
			.direction_output	= lpc32xx_gpio_dir_out_always,
			.set			= lpc32xx_gpo_set_value,
			.get			= lpc32xx_gpo_get_value,
			.request		= lpc32xx_gpio_request,
			.base			= LPC32XX_GPO_P3_GRP,
			.ngpio			= LPC32XX_GPO_P3_MAX,
			.names			= gpo_p3_names,
			.can_sleep		= 0,
		},
		.gpio_grp = &gpio_grp_regs_p3,
	},
};

void __init lpc32xx_gpio_init(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++)
		gpiochip_add(&lpc32xx_gpiochip[i].chip);
}