aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/plat-s3c64xx/gpiolib.c
blob: ee9188add8fbd7b0fb2243ad6e9a002a0b98b29b (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
/* arch/arm/plat-s3c64xx/gpiolib.c
 *
 * Copyright 2008 Openmoko, Inc.
 * Copyright 2008 Simtec Electronics
 *      Ben Dooks <ben@simtec.co.uk>
 *      http://armlinux.simtec.co.uk/
 *
 * S3C64XX - GPIOlib support 
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/io.h>

#include <mach/map.h>
#include <mach/gpio.h>
#include <mach/gpio-core.h>

#include <plat/gpio-cfg.h>
#include <plat/gpio-cfg-helpers.h>
#include <plat/regs-gpio.h>

/* GPIO bank summary:
 *
 * Bank	GPIOs	Style	SlpCon	ExtInt Group
 * A	8	4Bit	Yes	1
 * B	7	4Bit	Yes	1
 * C	8	4Bit	Yes	2
 * D	5	4Bit	Yes	3
 * E	5	4Bit	Yes	None
 * F	16	2Bit	Yes	4 [1]
 * G	7	4Bit	Yes	5
 * H	10	4Bit[2]	Yes	6
 * I	16	2Bit	Yes	None
 * J	12	2Bit	Yes	None
 * K	16	4Bit[2]	No	None
 * L	15	4Bit[2] No	None
 * M	6	4Bit	No	IRQ_EINT
 * N	16	2Bit	No	IRQ_EINT
 * O	16	2Bit	Yes	7
 * P	15	2Bit	Yes	8
 * Q	9	2Bit	Yes	9
 *
 * [1] BANKF pins 14,15 do not form part of the external interrupt sources
 * [2] BANK has two control registers, GPxCON0 and GPxCON1
 */

#define OFF_GPCON	(0x00)
#define OFF_GPDAT	(0x04)

#define con_4bit_shift(__off) ((__off) * 4)

#if 1
#define gpio_dbg(x...) do { } while(0)
#else
#define gpio_dbg(x...) printk(KERN_DEBUG ## x)
#endif

/* The s3c64xx_gpiolib_4bit routines are to control the gpio banks where
 * the gpio configuration register (GPxCON) has 4 bits per GPIO, as the
 * following example:
 *
 * base + 0x00: Control register, 4 bits per gpio
 *	        gpio n: 4 bits starting at (4*n)
 *		0000 = input, 0001 = output, others mean special-function
 * base + 0x04: Data register, 1 bit per gpio
 *		bit n: data bit n
 *
 * Note, since the data register is one bit per gpio and is at base + 0x4
 * we can use s3c_gpiolib_get and s3c_gpiolib_set to change the state of
 * the output.
*/

static int s3c64xx_gpiolib_4bit_input(struct gpio_chip *chip, unsigned offset)
{
	struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
	void __iomem *base = ourchip->base;
	unsigned long con;

	con = __raw_readl(base + OFF_GPCON);
	con &= ~(0xf << con_4bit_shift(offset));
	__raw_writel(con, base + OFF_GPCON);

	gpio_dbg("%s: %p: CON now %08lx\n", __func__, base, con);

	return 0;
}

static int s3c64xx_gpiolib_4bit_output(struct gpio_chip *chip,
				       unsigned offset, int value)
{
	struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
	void __iomem *base = ourchip->base;
	unsigned long con;
	unsigned long dat;

	con = __raw_readl(base + OFF_GPCON);
	con &= ~(0xf << con_4bit_shift(offset));
	con |= 0x1 << con_4bit_shift(offset);

	dat = __raw_readl(base + OFF_GPDAT);
	if (value)
		dat |= 1 << offset;
	else
		dat &= ~(1 << offset);

	__raw_writel(dat, base + OFF_GPDAT);
	__raw_writel(con, base + OFF_GPCON);
	__raw_writel(dat, base + OFF_GPDAT);

	gpio_dbg("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);

	return 0;
}

/* The next set of routines are for the case where the GPIO configuration
 * registers are 4 bits per GPIO but there is more than one register (the
 * bank has more than 8 GPIOs.
 *
 * This case is the similar to the 4 bit case, but the registers are as
 * follows:
 *
 * base + 0x00: Control register, 4 bits per gpio (lower 8 GPIOs)
 *	        gpio n: 4 bits starting at (4*n)
 *		0000 = input, 0001 = output, others mean special-function
 * base + 0x04: Control register, 4 bits per gpio (up to 8 additions GPIOs)
 *	        gpio n: 4 bits starting at (4*n)
 *		0000 = input, 0001 = output, others mean special-function
 * base + 0x08: Data register, 1 bit per gpio
 *		bit n: data bit n
 *
 * To allow us to use the s3c_gpiolib_get and s3c_gpiolib_set routines we
 * store the 'base + 0x4' address so that these routines see the data
 * register at ourchip->base + 0x04.
*/

static int s3c64xx_gpiolib_4bit2_input(struct gpio_chip *chip, unsigned offset)
{
	struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
	void __iomem *base = ourchip->base;
	void __iomem *regcon = base;
	unsigned long con;

	if (offset > 7)
		offset -= 8;
	else
		regcon -= 4;

	con = __raw_readl(regcon);
	con &= ~(0xf << con_4bit_shift(offset));
	__raw_writel(con, regcon);

	gpio_dbg("%s: %p: CON %08lx\n", __func__, base, con);

	return 0;

}

static int s3c64xx_gpiolib_4bit2_output(struct gpio_chip *chip,
				       unsigned offset, int value)
{
	struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
	void __iomem *base = ourchip->base;
	void __iomem *regcon = base;
	unsigned long con;
	unsigned long dat;

	if (offset > 7)
		offset -= 8;
	else
		regcon -= 4;

	con = __raw_readl(regcon);
	con &= ~(0xf << con_4bit_shift(offset));
	con |= 0x1 << con_4bit_shift(offset);

	dat = __raw_readl(base + OFF_GPDAT);
	if (value)
		dat |= 1 << offset;
	else
		dat &= ~(1 << offset);

	__raw_writel(dat, base + OFF_GPDAT);
	__raw_writel(con, regcon);
	__raw_writel(dat, base + OFF_GPDAT);

	gpio_dbg("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);

	return 0;
}

static struct s3c_gpio_cfg gpio_4bit_cfg_noint = {
	.set_config	= s3c_gpio_setcfg_s3c64xx_4bit,
	.set_pull	= s3c_gpio_setpull_updown,
	.get_pull	= s3c_gpio_getpull_updown,
};

static struct s3c_gpio_cfg gpio_4bit_cfg_eint0111 = {
	.cfg_eint	= 7,
	.set_config	= s3c_gpio_setcfg_s3c64xx_4bit,
	.set_pull	= s3c_gpio_setpull_updown,
	.get_pull	= s3c_gpio_getpull_updown,
};

static struct s3c_gpio_cfg gpio_4bit_cfg_eint0011 = {
	.cfg_eint	= 3,
	.set_config	= s3c_gpio_setcfg_s3c64xx_4bit,
	.set_pull	= s3c_gpio_setpull_updown,
	.get_pull	= s3c_gpio_getpull_updown,
};

static struct s3c_gpio_chip gpio_4bit[] = {
	{
		.base	= S3C64XX_GPA_BASE,
		.config	= &gpio_4bit_cfg_eint0111,
		.chip	= {
			.base	= S3C64XX_GPA(0),
			.ngpio	= S3C64XX_GPIO_A_NR,
			.label	= "GPA",
		},
	}, {
		.base	= S3C64XX_GPB_BASE,
		.config	= &gpio_4bit_cfg_eint0111,
		.chip	= {
			.base	= S3C64XX_GPB(0),
			.ngpio	= S3C64XX_GPIO_B_NR,
			.label	= "GPB",
		},
	}, {
		.base	= S3C64XX_GPC_BASE,
		.config	= &gpio_4bit_cfg_eint0111,
		.chip	= {
			.base	= S3C64XX_GPC(0),
			.ngpio	= S3C64XX_GPIO_C_NR,
			.label	= "GPC",
		},
	}, {
		.base	= S3C64XX_GPD_BASE,
		.config	= &gpio_4bit_cfg_eint0111,
		.chip	= {
			.base	= S3C64XX_GPD(0),
			.ngpio	= S3C64XX_GPIO_D_NR,
			.label	= "GPD",
		},
	}, {
		.base	= S3C64XX_GPE_BASE,
		.config	= &gpio_4bit_cfg_noint,
		.chip	= {
			.base	= S3C64XX_GPE(0),
			.ngpio	= S3C64XX_GPIO_E_NR,
			.label	= "GPE",
		},
	}, {
		.base	= S3C64XX_GPG_BASE,
		.config	= &gpio_4bit_cfg_eint0111,
		.chip	= {
			.base	= S3C64XX_GPG(0),
			.ngpio	= S3C64XX_GPIO_G_NR,
			.label	= "GPG",
		},
	}, {
		.base	= S3C64XX_GPM_BASE,
		.config	= &gpio_4bit_cfg_eint0011,
		.chip	= {
			.base	= S3C64XX_GPM(0),
			.ngpio	= S3C64XX_GPIO_M_NR,
			.label	= "GPM",
		},
	},
};

static struct s3c_gpio_chip gpio_4bit2[] = {
	{
		.base	= S3C64XX_GPH_BASE + 0x4,
		.config	= &gpio_4bit_cfg_eint0111,
		.chip	= {
			.base	= S3C64XX_GPH(0),
			.ngpio	= S3C64XX_GPIO_H_NR,
			.label	= "GPH",
		},
	}, {
		.base	= S3C64XX_GPK_BASE + 0x4,
		.config	= &gpio_4bit_cfg_noint,
		.chip	= {
			.base	= S3C64XX_GPK(0),
			.ngpio	= S3C64XX_GPIO_K_NR,
			.label	= "GPK",
		},
	}, {
		.base	= S3C64XX_GPL_BASE + 0x4,
		.config	= &gpio_4bit_cfg_eint0011,
		.chip	= {
			.base	= S3C64XX_GPL(0),
			.ngpio	= S3C64XX_GPIO_L_NR,
			.label	= "GPL",
		},
	},
};

static struct s3c_gpio_cfg gpio_2bit_cfg_noint = {
	.set_config	= s3c_gpio_setcfg_s3c24xx,
	.set_pull	= s3c_gpio_setpull_updown,
	.get_pull	= s3c_gpio_getpull_updown,
};

static struct s3c_gpio_cfg gpio_2bit_cfg_eint10 = {
	.cfg_eint	= 2,
	.set_config	= s3c_gpio_setcfg_s3c24xx,
	.set_pull	= s3c_gpio_setpull_updown,
	.get_pull	= s3c_gpio_getpull_updown,
};

static struct s3c_gpio_cfg gpio_2bit_cfg_eint11 = {
	.cfg_eint	= 3,
	.set_config	= s3c_gpio_setcfg_s3c24xx,
	.set_pull	= s3c_gpio_setpull_updown,
	.get_pull	= s3c_gpio_getpull_updown,
};

static struct s3c_gpio_chip gpio_2bit[] = {
	{
		.base	= S3C64XX_GPF_BASE,
		.config	= &gpio_2bit_cfg_eint11,
		.chip	= {
			.base	= S3C64XX_GPF(0),
			.ngpio	= S3C64XX_GPIO_F_NR,
			.label	= "GPF",
		},
	}, {
		.base	= S3C64XX_GPI_BASE,
		.config	= &gpio_2bit_cfg_noint,
		.chip	= {
			.base	= S3C64XX_GPI(0),
			.ngpio	= S3C64XX_GPIO_I_NR,
			.label	= "GPI",
		},
	}, {
		.base	= S3C64XX_GPJ_BASE,
		.config	= &gpio_2bit_cfg_noint,
		.chip	= {
			.base	= S3C64XX_GPJ(0),
			.ngpio	= S3C64XX_GPIO_J_NR,
			.label	= "GPJ",
		},
	}, {
		.base	= S3C64XX_GPN_BASE,
		.config	= &gpio_2bit_cfg_eint10,
		.chip	= {
			.base	= S3C64XX_GPN(0),
			.ngpio	= S3C64XX_GPIO_N_NR,
			.label	= "GPN",
		},
	}, {
		.base	= S3C64XX_GPO_BASE,
		.config	= &gpio_2bit_cfg_eint11,
		.chip	= {
			.base	= S3C64XX_GPO(0),
			.ngpio	= S3C64XX_GPIO_O_NR,
			.label	= "GPO",
		},
	}, {
		.base	= S3C64XX_GPP_BASE,
		.config	= &gpio_2bit_cfg_eint11,
		.chip	= {
			.base	= S3C64XX_GPP(0),
			.ngpio	= S3C64XX_GPIO_P_NR,
			.label	= "GPP",
		},
	}, {
		.base	= S3C64XX_GPQ_BASE,
		.config	= &gpio_2bit_cfg_eint11,
		.chip	= {
			.base	= S3C64XX_GPQ(0),
			.ngpio	= S3C64XX_GPIO_Q_NR,
			.label	= "GPQ",
		},
	},
};

static __init void s3c64xx_gpiolib_add_4bit(struct s3c_gpio_chip *chip)
{
	chip->chip.direction_input = s3c64xx_gpiolib_4bit_input;
	chip->chip.direction_output = s3c64xx_gpiolib_4bit_output;
}

static __init void s3c64xx_gpiolib_add_4bit2(struct s3c_gpio_chip *chip)
{
	chip->chip.direction_input = s3c64xx_gpiolib_4bit2_input;
	chip->chip.direction_output = s3c64xx_gpiolib_4bit2_output;
}

static __init void s3c64xx_gpiolib_add(struct s3c_gpio_chip *chips,
				       int nr_chips,
				       void (*fn)(struct s3c_gpio_chip *))
{
	for (; nr_chips > 0; nr_chips--, chips++) {
		if (fn)
			(fn)(chips);
		s3c_gpiolib_add(chips);
	}
}

static __init int s3c64xx_gpiolib_init(void)
{
	s3c64xx_gpiolib_add(gpio_4bit, ARRAY_SIZE(gpio_4bit),
			    s3c64xx_gpiolib_add_4bit);

	s3c64xx_gpiolib_add(gpio_4bit2, ARRAY_SIZE(gpio_4bit2),
			    s3c64xx_gpiolib_add_4bit2);

	s3c64xx_gpiolib_add(gpio_2bit, ARRAY_SIZE(gpio_2bit), NULL);

	return 0;
}

core_initcall(s3c64xx_gpiolib_init);