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nilfs2: fix oopses with doubly mounted snapshots
[linux-2.6/mini2440.git] / arch / arm / plat-s3c64xx / gpiolib.c
blob92859290ea338f2cc599b4926ba1354510a90405
1 /* arch/arm/plat-s3c64xx/gpiolib.c
2 *
3 * Copyright 2008 Openmoko, Inc.
4 * Copyright 2008 Simtec Electronics
5 * Ben Dooks <ben@simtec.co.uk>
6 * http://armlinux.simtec.co.uk/
7 *
8 * S3C64XX - GPIOlib support
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/irq.h>
17 #include <linux/io.h>
18
19 #include <mach/map.h>
20 #include <mach/gpio.h>
21 #include <mach/gpio-core.h>
22
23 #include <plat/gpio-cfg.h>
24 #include <plat/gpio-cfg-helpers.h>
25 #include <plat/regs-gpio.h>
26
27 /* GPIO bank summary:
28 *
29 * Bank GPIOs Style SlpCon ExtInt Group
30 * A 8 4Bit Yes 1
31 * B 7 4Bit Yes 1
32 * C 8 4Bit Yes 2
33 * D 5 4Bit Yes 3
34 * E 5 4Bit Yes None
35 * F 16 2Bit Yes 4 [1]
36 * G 7 4Bit Yes 5
37 * H 10 4Bit[2] Yes 6
38 * I 16 2Bit Yes None
39 * J 12 2Bit Yes None
40 * K 16 4Bit[2] No None
41 * L 15 4Bit[2] No None
42 * M 6 4Bit No IRQ_EINT
43 * N 16 2Bit No IRQ_EINT
44 * O 16 2Bit Yes 7
45 * P 15 2Bit Yes 8
46 * Q 9 2Bit Yes 9
47 *
48 * [1] BANKF pins 14,15 do not form part of the external interrupt sources
49 * [2] BANK has two control registers, GPxCON0 and GPxCON1
50 */
51
52 #define OFF_GPCON (0x00)
53 #define OFF_GPDAT (0x04)
54
55 #define con_4bit_shift(__off) ((__off) * 4)
56
57 #if 1
58 #define gpio_dbg(x...) do { } while(0)
59 #else
60 #define gpio_dbg(x...) printk(KERN_DEBUG x)
61 #endif
62
63 /* The s3c64xx_gpiolib_4bit routines are to control the gpio banks where
64 * the gpio configuration register (GPxCON) has 4 bits per GPIO, as the
65 * following example:
66 *
67 * base + 0x00: Control register, 4 bits per gpio
68 * gpio n: 4 bits starting at (4*n)
69 * 0000 = input, 0001 = output, others mean special-function
70 * base + 0x04: Data register, 1 bit per gpio
71 * bit n: data bit n
72 *
73 * Note, since the data register is one bit per gpio and is at base + 0x4
74 * we can use s3c_gpiolib_get and s3c_gpiolib_set to change the state of
75 * the output.
76 */
77
78 static int s3c64xx_gpiolib_4bit_input(struct gpio_chip *chip, unsigned offset)
79 {
80 struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
81 void __iomem *base = ourchip->base;
82 unsigned long con;
83
84 con = __raw_readl(base + OFF_GPCON);
85 con &= ~(0xf << con_4bit_shift(offset));
86 __raw_writel(con, base + OFF_GPCON);
87
88 gpio_dbg("%s: %p: CON now %08lx\n", __func__, base, con);
89
90 return 0;
91 }
92
93 static int s3c64xx_gpiolib_4bit_output(struct gpio_chip *chip,
94 unsigned offset, int value)
95 {
96 struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
97 void __iomem *base = ourchip->base;
98 unsigned long con;
99 unsigned long dat;
100
101 con = __raw_readl(base + OFF_GPCON);
102 con &= ~(0xf << con_4bit_shift(offset));
103 con |= 0x1 << con_4bit_shift(offset);
104
105 dat = __raw_readl(base + OFF_GPDAT);
106 if (value)
107 dat |= 1 << offset;
108 else
109 dat &= ~(1 << offset);
110
111 __raw_writel(dat, base + OFF_GPDAT);
112 __raw_writel(con, base + OFF_GPCON);
113 __raw_writel(dat, base + OFF_GPDAT);
114
115 gpio_dbg("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
116
117 return 0;
118 }
119
120 /* The next set of routines are for the case where the GPIO configuration
121 * registers are 4 bits per GPIO but there is more than one register (the
122 * bank has more than 8 GPIOs.
123 *
124 * This case is the similar to the 4 bit case, but the registers are as
125 * follows:
126 *
127 * base + 0x00: Control register, 4 bits per gpio (lower 8 GPIOs)
128 * gpio n: 4 bits starting at (4*n)
129 * 0000 = input, 0001 = output, others mean special-function
130 * base + 0x04: Control register, 4 bits per gpio (up to 8 additions GPIOs)
131 * gpio n: 4 bits starting at (4*n)
132 * 0000 = input, 0001 = output, others mean special-function
133 * base + 0x08: Data register, 1 bit per gpio
134 * bit n: data bit n
135 *
136 * To allow us to use the s3c_gpiolib_get and s3c_gpiolib_set routines we
137 * store the 'base + 0x4' address so that these routines see the data
138 * register at ourchip->base + 0x04.
139 */
140
141 static int s3c64xx_gpiolib_4bit2_input(struct gpio_chip *chip, unsigned offset)
142 {
143 struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
144 void __iomem *base = ourchip->base;
145 void __iomem *regcon = base;
146 unsigned long con;
147
148 if (offset > 7)
149 offset -= 8;
150 else
151 regcon -= 4;
152
153 con = __raw_readl(regcon);
154 con &= ~(0xf << con_4bit_shift(offset));
155 __raw_writel(con, regcon);
156
157 gpio_dbg("%s: %p: CON %08lx\n", __func__, base, con);
158
159 return 0;
160
161 }
162
163 static int s3c64xx_gpiolib_4bit2_output(struct gpio_chip *chip,
164 unsigned offset, int value)
165 {
166 struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
167 void __iomem *base = ourchip->base;
168 void __iomem *regcon = base;
169 unsigned long con;
170 unsigned long dat;
171
172 if (offset > 7)
173 offset -= 8;
174 else
175 regcon -= 4;
176
177 con = __raw_readl(regcon);
178 con &= ~(0xf << con_4bit_shift(offset));
179 con |= 0x1 << con_4bit_shift(offset);
180
181 dat = __raw_readl(base + OFF_GPDAT);
182 if (value)
183 dat |= 1 << offset;
184 else
185 dat &= ~(1 << offset);
186
187 __raw_writel(dat, base + OFF_GPDAT);
188 __raw_writel(con, regcon);
189 __raw_writel(dat, base + OFF_GPDAT);
190
191 gpio_dbg("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
192
193 return 0;
194 }
195
196 static struct s3c_gpio_cfg gpio_4bit_cfg_noint = {
197 .set_config = s3c_gpio_setcfg_s3c64xx_4bit,
198 .set_pull = s3c_gpio_setpull_updown,
199 .get_pull = s3c_gpio_getpull_updown,
200 };
201
202 static struct s3c_gpio_cfg gpio_4bit_cfg_eint0111 = {
203 .cfg_eint = 7,
204 .set_config = s3c_gpio_setcfg_s3c64xx_4bit,
205 .set_pull = s3c_gpio_setpull_updown,
206 .get_pull = s3c_gpio_getpull_updown,
207 };
208
209 static struct s3c_gpio_cfg gpio_4bit_cfg_eint0011 = {
210 .cfg_eint = 3,
211 .set_config = s3c_gpio_setcfg_s3c64xx_4bit,
212 .set_pull = s3c_gpio_setpull_updown,
213 .get_pull = s3c_gpio_getpull_updown,
214 };
215
216 static struct s3c_gpio_chip gpio_4bit[] = {
217 {
218 .base = S3C64XX_GPA_BASE,
219 .config = &gpio_4bit_cfg_eint0111,
220 .chip = {
221 .base = S3C64XX_GPA(0),
222 .ngpio = S3C64XX_GPIO_A_NR,
223 .label = "GPA",
224 },
225 }, {
226 .base = S3C64XX_GPB_BASE,
227 .config = &gpio_4bit_cfg_eint0111,
228 .chip = {
229 .base = S3C64XX_GPB(0),
230 .ngpio = S3C64XX_GPIO_B_NR,
231 .label = "GPB",
232 },
233 }, {
234 .base = S3C64XX_GPC_BASE,
235 .config = &gpio_4bit_cfg_eint0111,
236 .chip = {
237 .base = S3C64XX_GPC(0),
238 .ngpio = S3C64XX_GPIO_C_NR,
239 .label = "GPC",
240 },
241 }, {
242 .base = S3C64XX_GPD_BASE,
243 .config = &gpio_4bit_cfg_eint0111,
244 .chip = {
245 .base = S3C64XX_GPD(0),
246 .ngpio = S3C64XX_GPIO_D_NR,
247 .label = "GPD",
248 },
249 }, {
250 .base = S3C64XX_GPE_BASE,
251 .config = &gpio_4bit_cfg_noint,
252 .chip = {
253 .base = S3C64XX_GPE(0),
254 .ngpio = S3C64XX_GPIO_E_NR,
255 .label = "GPE",
256 },
257 }, {
258 .base = S3C64XX_GPG_BASE,
259 .config = &gpio_4bit_cfg_eint0111,
260 .chip = {
261 .base = S3C64XX_GPG(0),
262 .ngpio = S3C64XX_GPIO_G_NR,
263 .label = "GPG",
264 },
265 }, {
266 .base = S3C64XX_GPM_BASE,
267 .config = &gpio_4bit_cfg_eint0011,
268 .chip = {
269 .base = S3C64XX_GPM(0),
270 .ngpio = S3C64XX_GPIO_M_NR,
271 .label = "GPM",
272 },
273 },
274 };
275
276 static struct s3c_gpio_chip gpio_4bit2[] = {
277 {
278 .base = S3C64XX_GPH_BASE + 0x4,
279 .config = &gpio_4bit_cfg_eint0111,
280 .chip = {
281 .base = S3C64XX_GPH(0),
282 .ngpio = S3C64XX_GPIO_H_NR,
283 .label = "GPH",
284 },
285 }, {
286 .base = S3C64XX_GPK_BASE + 0x4,
287 .config = &gpio_4bit_cfg_noint,
288 .chip = {
289 .base = S3C64XX_GPK(0),
290 .ngpio = S3C64XX_GPIO_K_NR,
291 .label = "GPK",
292 },
293 }, {
294 .base = S3C64XX_GPL_BASE + 0x4,
295 .config = &gpio_4bit_cfg_eint0011,
296 .chip = {
297 .base = S3C64XX_GPL(0),
298 .ngpio = S3C64XX_GPIO_L_NR,
299 .label = "GPL",
300 },
301 },
302 };
303
304 static struct s3c_gpio_cfg gpio_2bit_cfg_noint = {
305 .set_config = s3c_gpio_setcfg_s3c24xx,
306 .set_pull = s3c_gpio_setpull_updown,
307 .get_pull = s3c_gpio_getpull_updown,
308 };
309
310 static struct s3c_gpio_cfg gpio_2bit_cfg_eint10 = {
311 .cfg_eint = 2,
312 .set_config = s3c_gpio_setcfg_s3c24xx,
313 .set_pull = s3c_gpio_setpull_updown,
314 .get_pull = s3c_gpio_getpull_updown,
315 };
316
317 static struct s3c_gpio_cfg gpio_2bit_cfg_eint11 = {
318 .cfg_eint = 3,
319 .set_config = s3c_gpio_setcfg_s3c24xx,
320 .set_pull = s3c_gpio_setpull_updown,
321 .get_pull = s3c_gpio_getpull_updown,
322 };
323
324 int s3c64xx_gpio2int_gpn(struct gpio_chip *chip, unsigned pin)
325 {
326 return IRQ_EINT(0) + pin;
327 }
328
329 static struct s3c_gpio_chip gpio_2bit[] = {
330 {
331 .base = S3C64XX_GPF_BASE,
332 .config = &gpio_2bit_cfg_eint11,
333 .chip = {
334 .base = S3C64XX_GPF(0),
335 .ngpio = S3C64XX_GPIO_F_NR,
336 .label = "GPF",
337 },
338 }, {
339 .base = S3C64XX_GPI_BASE,
340 .config = &gpio_2bit_cfg_noint,
341 .chip = {
342 .base = S3C64XX_GPI(0),
343 .ngpio = S3C64XX_GPIO_I_NR,
344 .label = "GPI",
345 },
346 }, {
347 .base = S3C64XX_GPJ_BASE,
348 .config = &gpio_2bit_cfg_noint,
349 .chip = {
350 .base = S3C64XX_GPJ(0),
351 .ngpio = S3C64XX_GPIO_J_NR,
352 .label = "GPJ",
353 },
354 }, {
355 .base = S3C64XX_GPN_BASE,
356 .config = &gpio_2bit_cfg_eint10,
357 .chip = {
358 .base = S3C64XX_GPN(0),
359 .ngpio = S3C64XX_GPIO_N_NR,
360 .label = "GPN",
361 .to_irq = s3c64xx_gpio2int_gpn,
362 },
363 }, {
364 .base = S3C64XX_GPO_BASE,
365 .config = &gpio_2bit_cfg_eint11,
366 .chip = {
367 .base = S3C64XX_GPO(0),
368 .ngpio = S3C64XX_GPIO_O_NR,
369 .label = "GPO",
370 },
371 }, {
372 .base = S3C64XX_GPP_BASE,
373 .config = &gpio_2bit_cfg_eint11,
374 .chip = {
375 .base = S3C64XX_GPP(0),
376 .ngpio = S3C64XX_GPIO_P_NR,
377 .label = "GPP",
378 },
379 }, {
380 .base = S3C64XX_GPQ_BASE,
381 .config = &gpio_2bit_cfg_eint11,
382 .chip = {
383 .base = S3C64XX_GPQ(0),
384 .ngpio = S3C64XX_GPIO_Q_NR,
385 .label = "GPQ",
386 },
387 },
388 };
389
390 static __init void s3c64xx_gpiolib_add_4bit(struct s3c_gpio_chip *chip)
391 {
392 chip->chip.direction_input = s3c64xx_gpiolib_4bit_input;
393 chip->chip.direction_output = s3c64xx_gpiolib_4bit_output;
394 chip->pm = __gpio_pm(&s3c_gpio_pm_4bit);
395 }
396
397 static __init void s3c64xx_gpiolib_add_4bit2(struct s3c_gpio_chip *chip)
398 {
399 chip->chip.direction_input = s3c64xx_gpiolib_4bit2_input;
400 chip->chip.direction_output = s3c64xx_gpiolib_4bit2_output;
401 chip->pm = __gpio_pm(&s3c_gpio_pm_4bit);
402 }
403
404 static __init void s3c64xx_gpiolib_add_2bit(struct s3c_gpio_chip *chip)
405 {
406 chip->pm = __gpio_pm(&s3c_gpio_pm_2bit);
407 }
408
409 static __init void s3c64xx_gpiolib_add(struct s3c_gpio_chip *chips,
410 int nr_chips,
411 void (*fn)(struct s3c_gpio_chip *))
412 {
413 for (; nr_chips > 0; nr_chips--, chips++) {
414 if (fn)
415 (fn)(chips);
416 s3c_gpiolib_add(chips);
417 }
418 }
419
420 static __init int s3c64xx_gpiolib_init(void)
421 {
422 s3c64xx_gpiolib_add(gpio_4bit, ARRAY_SIZE(gpio_4bit),
423 s3c64xx_gpiolib_add_4bit);
424
425 s3c64xx_gpiolib_add(gpio_4bit2, ARRAY_SIZE(gpio_4bit2),
426 s3c64xx_gpiolib_add_4bit2);
427
428 s3c64xx_gpiolib_add(gpio_2bit, ARRAY_SIZE(gpio_2bit),
429 s3c64xx_gpiolib_add_2bit);
430
431 return 0;
432 }
433
434 core_initcall(s3c64xx_gpiolib_init);
Support for the Chinese Samsung S3C2440 based development boards