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Revert "fix mismerge with Trond's stuff (create_mnt_ns() export is gone now)"
[linux-2.6/linux-2.6-openrd.git] / arch / arm / plat-s5pc1xx / gpiolib.c
blobfacb410e7a71cf8a8dfda0d53cdb614c0b6d7e0e
1 /*
2 * arch/arm/plat-s5pc1xx/gpiolib.c
3 *
4 * Copyright 2009 Samsung Electronics Co
5 * Kyungmin Park <kyungmin.park@samsung.com>
6 *
7 * S5PC1XX - GPIOlib support
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/irq.h>
16 #include <linux/io.h>
17 #include <linux/gpio.h>
18
19 #include <mach/map.h>
20 #include <mach/gpio-core.h>
21
22 #include <plat/gpio-cfg.h>
23 #include <plat/gpio-cfg-helpers.h>
24 #include <plat/regs-gpio.h>
25
26 /* S5PC100 GPIO bank summary:
27 *
28 * Bank GPIOs Style INT Type
29 * A0 8 4Bit GPIO_INT0
30 * A1 5 4Bit GPIO_INT1
31 * B 8 4Bit GPIO_INT2
32 * C 5 4Bit GPIO_INT3
33 * D 7 4Bit GPIO_INT4
34 * E0 8 4Bit GPIO_INT5
35 * E1 6 4Bit GPIO_INT6
36 * F0 8 4Bit GPIO_INT7
37 * F1 8 4Bit GPIO_INT8
38 * F2 8 4Bit GPIO_INT9
39 * F3 4 4Bit GPIO_INT10
40 * G0 8 4Bit GPIO_INT11
41 * G1 3 4Bit GPIO_INT12
42 * G2 7 4Bit GPIO_INT13
43 * G3 7 4Bit GPIO_INT14
44 * H0 8 4Bit WKUP_INT
45 * H1 8 4Bit WKUP_INT
46 * H2 8 4Bit WKUP_INT
47 * H3 8 4Bit WKUP_INT
48 * I 8 4Bit GPIO_INT15
49 * J0 8 4Bit GPIO_INT16
50 * J1 5 4Bit GPIO_INT17
51 * J2 8 4Bit GPIO_INT18
52 * J3 8 4Bit GPIO_INT19
53 * J4 4 4Bit GPIO_INT20
54 * K0 8 4Bit None
55 * K1 6 4Bit None
56 * K2 8 4Bit None
57 * K3 8 4Bit None
58 * L0 8 4Bit None
59 * L1 8 4Bit None
60 * L2 8 4Bit None
61 * L3 8 4Bit None
62 */
63
64 #define OFF_GPCON (0x00)
65 #define OFF_GPDAT (0x04)
66
67 #define con_4bit_shift(__off) ((__off) * 4)
68
69 #if 1
70 #define gpio_dbg(x...) do { } while (0)
71 #else
72 #define gpio_dbg(x...) printk(KERN_DEBUG x)
73 #endif
74
75 /* The s5pc1xx_gpiolib routines are to control the gpio banks where
76 * the gpio configuration register (GPxCON) has 4 bits per GPIO, as the
77 * following example:
78 *
79 * base + 0x00: Control register, 4 bits per gpio
80 * gpio n: 4 bits starting at (4*n)
81 * 0000 = input, 0001 = output, others mean special-function
82 * base + 0x04: Data register, 1 bit per gpio
83 * bit n: data bit n
84 *
85 * Note, since the data register is one bit per gpio and is at base + 0x4
86 * we can use s3c_gpiolib_get and s3c_gpiolib_set to change the state of
87 * the output.
88 */
89
90 static int s5pc1xx_gpiolib_input(struct gpio_chip *chip, unsigned offset)
91 {
92 struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
93 void __iomem *base = ourchip->base;
94 unsigned long con;
95
96 con = __raw_readl(base + OFF_GPCON);
97 con &= ~(0xf << con_4bit_shift(offset));
98 __raw_writel(con, base + OFF_GPCON);
99
100 gpio_dbg("%s: %p: CON now %08lx\n", __func__, base, con);
101
102 return 0;
103 }
104
105 static int s5pc1xx_gpiolib_output(struct gpio_chip *chip,
106 unsigned offset, int value)
107 {
108 struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
109 void __iomem *base = ourchip->base;
110 unsigned long con;
111 unsigned long dat;
112
113 con = __raw_readl(base + OFF_GPCON);
114 con &= ~(0xf << con_4bit_shift(offset));
115 con |= 0x1 << con_4bit_shift(offset);
116
117 dat = __raw_readl(base + OFF_GPDAT);
118 if (value)
119 dat |= 1 << offset;
120 else
121 dat &= ~(1 << offset);
122
123 __raw_writel(dat, base + OFF_GPDAT);
124 __raw_writel(con, base + OFF_GPCON);
125 __raw_writel(dat, base + OFF_GPDAT);
126
127 gpio_dbg("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
128
129 return 0;
130 }
131
132 static int s5pc1xx_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset)
133 {
134 return S3C_IRQ_GPIO(chip->base + offset);
135 }
136
137 static int s5pc1xx_gpiolib_to_eint(struct gpio_chip *chip, unsigned int offset)
138 {
139 int base;
140
141 base = chip->base - S5PC100_GPH0(0);
142 if (base == 0)
143 return IRQ_EINT(offset);
144 base = chip->base - S5PC100_GPH1(0);
145 if (base == 0)
146 return IRQ_EINT(8 + offset);
147 base = chip->base - S5PC100_GPH2(0);
148 if (base == 0)
149 return IRQ_EINT(16 + offset);
150 base = chip->base - S5PC100_GPH3(0);
151 if (base == 0)
152 return IRQ_EINT(24 + offset);
153 return -EINVAL;
154 }
155
156 static struct s3c_gpio_cfg gpio_cfg = {
157 .set_config = s3c_gpio_setcfg_s3c64xx_4bit,
158 .set_pull = s3c_gpio_setpull_updown,
159 .get_pull = s3c_gpio_getpull_updown,
160 };
161
162 static struct s3c_gpio_cfg gpio_cfg_eint = {
163 .cfg_eint = 0xf,
164 .set_config = s3c_gpio_setcfg_s3c64xx_4bit,
165 .set_pull = s3c_gpio_setpull_updown,
166 .get_pull = s3c_gpio_getpull_updown,
167 };
168
169 static struct s3c_gpio_cfg gpio_cfg_noint = {
170 .set_config = s3c_gpio_setcfg_s3c64xx_4bit,
171 .set_pull = s3c_gpio_setpull_updown,
172 .get_pull = s3c_gpio_getpull_updown,
173 };
174
175 static struct s3c_gpio_chip s5pc100_gpio_chips[] = {
176 {
177 .base = S5PC100_GPA0_BASE,
178 .config = &gpio_cfg,
179 .chip = {
180 .base = S5PC100_GPA0(0),
181 .ngpio = S5PC100_GPIO_A0_NR,
182 .label = "GPA0",
183 },
184 }, {
185 .base = S5PC100_GPA1_BASE,
186 .config = &gpio_cfg,
187 .chip = {
188 .base = S5PC100_GPA1(0),
189 .ngpio = S5PC100_GPIO_A1_NR,
190 .label = "GPA1",
191 },
192 }, {
193 .base = S5PC100_GPB_BASE,
194 .config = &gpio_cfg,
195 .chip = {
196 .base = S5PC100_GPB(0),
197 .ngpio = S5PC100_GPIO_B_NR,
198 .label = "GPB",
199 },
200 }, {
201 .base = S5PC100_GPC_BASE,
202 .config = &gpio_cfg,
203 .chip = {
204 .base = S5PC100_GPC(0),
205 .ngpio = S5PC100_GPIO_C_NR,
206 .label = "GPC",
207 },
208 }, {
209 .base = S5PC100_GPD_BASE,
210 .config = &gpio_cfg,
211 .chip = {
212 .base = S5PC100_GPD(0),
213 .ngpio = S5PC100_GPIO_D_NR,
214 .label = "GPD",
215 },
216 }, {
217 .base = S5PC100_GPE0_BASE,
218 .config = &gpio_cfg,
219 .chip = {
220 .base = S5PC100_GPE0(0),
221 .ngpio = S5PC100_GPIO_E0_NR,
222 .label = "GPE0",
223 },
224 }, {
225 .base = S5PC100_GPE1_BASE,
226 .config = &gpio_cfg,
227 .chip = {
228 .base = S5PC100_GPE1(0),
229 .ngpio = S5PC100_GPIO_E1_NR,
230 .label = "GPE1",
231 },
232 }, {
233 .base = S5PC100_GPF0_BASE,
234 .config = &gpio_cfg,
235 .chip = {
236 .base = S5PC100_GPF0(0),
237 .ngpio = S5PC100_GPIO_F0_NR,
238 .label = "GPF0",
239 },
240 }, {
241 .base = S5PC100_GPF1_BASE,
242 .config = &gpio_cfg,
243 .chip = {
244 .base = S5PC100_GPF1(0),
245 .ngpio = S5PC100_GPIO_F1_NR,
246 .label = "GPF1",
247 },
248 }, {
249 .base = S5PC100_GPF2_BASE,
250 .config = &gpio_cfg,
251 .chip = {
252 .base = S5PC100_GPF2(0),
253 .ngpio = S5PC100_GPIO_F2_NR,
254 .label = "GPF2",
255 },
256 }, {
257 .base = S5PC100_GPF3_BASE,
258 .config = &gpio_cfg,
259 .chip = {
260 .base = S5PC100_GPF3(0),
261 .ngpio = S5PC100_GPIO_F3_NR,
262 .label = "GPF3",
263 },
264 }, {
265 .base = S5PC100_GPG0_BASE,
266 .config = &gpio_cfg,
267 .chip = {
268 .base = S5PC100_GPG0(0),
269 .ngpio = S5PC100_GPIO_G0_NR,
270 .label = "GPG0",
271 },
272 }, {
273 .base = S5PC100_GPG1_BASE,
274 .config = &gpio_cfg,
275 .chip = {
276 .base = S5PC100_GPG1(0),
277 .ngpio = S5PC100_GPIO_G1_NR,
278 .label = "GPG1",
279 },
280 }, {
281 .base = S5PC100_GPG2_BASE,
282 .config = &gpio_cfg,
283 .chip = {
284 .base = S5PC100_GPG2(0),
285 .ngpio = S5PC100_GPIO_G2_NR,
286 .label = "GPG2",
287 },
288 }, {
289 .base = S5PC100_GPG3_BASE,
290 .config = &gpio_cfg,
291 .chip = {
292 .base = S5PC100_GPG3(0),
293 .ngpio = S5PC100_GPIO_G3_NR,
294 .label = "GPG3",
295 },
296 }, {
297 .base = S5PC100_GPH0_BASE,
298 .config = &gpio_cfg_eint,
299 .chip = {
300 .base = S5PC100_GPH0(0),
301 .ngpio = S5PC100_GPIO_H0_NR,
302 .label = "GPH0",
303 },
304 }, {
305 .base = S5PC100_GPH1_BASE,
306 .config = &gpio_cfg_eint,
307 .chip = {
308 .base = S5PC100_GPH1(0),
309 .ngpio = S5PC100_GPIO_H1_NR,
310 .label = "GPH1",
311 },
312 }, {
313 .base = S5PC100_GPH2_BASE,
314 .config = &gpio_cfg_eint,
315 .chip = {
316 .base = S5PC100_GPH2(0),
317 .ngpio = S5PC100_GPIO_H2_NR,
318 .label = "GPH2",
319 },
320 }, {
321 .base = S5PC100_GPH3_BASE,
322 .config = &gpio_cfg_eint,
323 .chip = {
324 .base = S5PC100_GPH3(0),
325 .ngpio = S5PC100_GPIO_H3_NR,
326 .label = "GPH3",
327 },
328 }, {
329 .base = S5PC100_GPI_BASE,
330 .config = &gpio_cfg,
331 .chip = {
332 .base = S5PC100_GPI(0),
333 .ngpio = S5PC100_GPIO_I_NR,
334 .label = "GPI",
335 },
336 }, {
337 .base = S5PC100_GPJ0_BASE,
338 .config = &gpio_cfg,
339 .chip = {
340 .base = S5PC100_GPJ0(0),
341 .ngpio = S5PC100_GPIO_J0_NR,
342 .label = "GPJ0",
343 },
344 }, {
345 .base = S5PC100_GPJ1_BASE,
346 .config = &gpio_cfg,
347 .chip = {
348 .base = S5PC100_GPJ1(0),
349 .ngpio = S5PC100_GPIO_J1_NR,
350 .label = "GPJ1",
351 },
352 }, {
353 .base = S5PC100_GPJ2_BASE,
354 .config = &gpio_cfg,
355 .chip = {
356 .base = S5PC100_GPJ2(0),
357 .ngpio = S5PC100_GPIO_J2_NR,
358 .label = "GPJ2",
359 },
360 }, {
361 .base = S5PC100_GPJ3_BASE,
362 .config = &gpio_cfg,
363 .chip = {
364 .base = S5PC100_GPJ3(0),
365 .ngpio = S5PC100_GPIO_J3_NR,
366 .label = "GPJ3",
367 },
368 }, {
369 .base = S5PC100_GPJ4_BASE,
370 .config = &gpio_cfg,
371 .chip = {
372 .base = S5PC100_GPJ4(0),
373 .ngpio = S5PC100_GPIO_J4_NR,
374 .label = "GPJ4",
375 },
376 }, {
377 .base = S5PC100_GPK0_BASE,
378 .config = &gpio_cfg_noint,
379 .chip = {
380 .base = S5PC100_GPK0(0),
381 .ngpio = S5PC100_GPIO_K0_NR,
382 .label = "GPK0",
383 },
384 }, {
385 .base = S5PC100_GPK1_BASE,
386 .config = &gpio_cfg_noint,
387 .chip = {
388 .base = S5PC100_GPK1(0),
389 .ngpio = S5PC100_GPIO_K1_NR,
390 .label = "GPK1",
391 },
392 }, {
393 .base = S5PC100_GPK2_BASE,
394 .config = &gpio_cfg_noint,
395 .chip = {
396 .base = S5PC100_GPK2(0),
397 .ngpio = S5PC100_GPIO_K2_NR,
398 .label = "GPK2",
399 },
400 }, {
401 .base = S5PC100_GPK3_BASE,
402 .config = &gpio_cfg_noint,
403 .chip = {
404 .base = S5PC100_GPK3(0),
405 .ngpio = S5PC100_GPIO_K3_NR,
406 .label = "GPK3",
407 },
408 }, {
409 .base = S5PC100_GPL0_BASE,
410 .config = &gpio_cfg_noint,
411 .chip = {
412 .base = S5PC100_GPL0(0),
413 .ngpio = S5PC100_GPIO_L0_NR,
414 .label = "GPL0",
415 },
416 }, {
417 .base = S5PC100_GPL1_BASE,
418 .config = &gpio_cfg_noint,
419 .chip = {
420 .base = S5PC100_GPL1(0),
421 .ngpio = S5PC100_GPIO_L1_NR,
422 .label = "GPL1",
423 },
424 }, {
425 .base = S5PC100_GPL2_BASE,
426 .config = &gpio_cfg_noint,
427 .chip = {
428 .base = S5PC100_GPL2(0),
429 .ngpio = S5PC100_GPIO_L2_NR,
430 .label = "GPL2",
431 },
432 }, {
433 .base = S5PC100_GPL3_BASE,
434 .config = &gpio_cfg_noint,
435 .chip = {
436 .base = S5PC100_GPL3(0),
437 .ngpio = S5PC100_GPIO_L3_NR,
438 .label = "GPL3",
439 },
440 }, {
441 .base = S5PC100_GPL4_BASE,
442 .config = &gpio_cfg_noint,
443 .chip = {
444 .base = S5PC100_GPL4(0),
445 .ngpio = S5PC100_GPIO_L4_NR,
446 .label = "GPL4",
447 },
448 },
449 };
450
451 /* FIXME move from irq-gpio.c */
452 extern struct irq_chip s5pc1xx_gpioint;
453 extern void s5pc1xx_irq_gpioint_handler(unsigned int irq, struct irq_desc *desc);
454
455 static __init void s5pc1xx_gpiolib_link(struct s3c_gpio_chip *chip)
456 {
457 chip->chip.direction_input = s5pc1xx_gpiolib_input;
458 chip->chip.direction_output = s5pc1xx_gpiolib_output;
459 chip->pm = __gpio_pm(&s3c_gpio_pm_4bit);
460
461 /* Interrupt */
462 if (chip->config == &gpio_cfg) {
463 int i, irq;
464
465 chip->chip.to_irq = s5pc1xx_gpiolib_to_irq;
466
467 for (i = 0; i < chip->chip.ngpio; i++) {
468 irq = S3C_IRQ_GPIO_BASE + chip->chip.base + i;
469 set_irq_chip(irq, &s5pc1xx_gpioint);
470 set_irq_data(irq, &chip->chip);
471 set_irq_handler(irq, handle_level_irq);
472 set_irq_flags(irq, IRQF_VALID);
473 }
474 } else if (chip->config == &gpio_cfg_eint)
475 chip->chip.to_irq = s5pc1xx_gpiolib_to_eint;
476 }
477
478 static __init void s5pc1xx_gpiolib_add(struct s3c_gpio_chip *chips,
479 int nr_chips,
480 void (*fn)(struct s3c_gpio_chip *))
481 {
482 for (; nr_chips > 0; nr_chips--, chips++) {
483 if (fn)
484 (fn)(chips);
485 s3c_gpiolib_add(chips);
486 }
487 }
488
489 static __init int s5pc1xx_gpiolib_init(void)
490 {
491 struct s3c_gpio_chip *chips;
492 int nr_chips;
493
494 chips = s5pc100_gpio_chips;
495 nr_chips = ARRAY_SIZE(s5pc100_gpio_chips);
496
497 s5pc1xx_gpiolib_add(chips, nr_chips, s5pc1xx_gpiolib_link);
498 /* Interrupt */
499 set_irq_chained_handler(IRQ_GPIOINT, s5pc1xx_irq_gpioint_handler);
500
501 return 0;
502 }
503 core_initcall(s5pc1xx_gpiolib_init);
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