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Linux 3.11-rc3
[cris-mirror.git] / arch / arm / mach-pxa / mfp-pxa2xx.c
blobef0426a159d4d4e04c681f7097fb8732d7096156
1 /*
2 * linux/arch/arm/mach-pxa/mfp-pxa2xx.c
3 *
4 * PXA2xx pin mux configuration support
5 *
6 * The GPIOs on PXA2xx can be configured as one of many alternate
7 * functions, this is by concept samilar to the MFP configuration
8 * on PXA3xx, what's more important, the low power pin state and
9 * wakeup detection are also supported by the same framework.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15 #include <linux/gpio.h>
16 #include <linux/gpio-pxa.h>
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20 #include <linux/io.h>
21 #include <linux/syscore_ops.h>
22
23 #include <mach/pxa2xx-regs.h>
24 #include <mach/mfp-pxa2xx.h>
25
26 #include "generic.h"
27
28 #define PGSR(x) __REG2(0x40F00020, (x) << 2)
29 #define __GAFR(u, x) __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
30 #define GAFR_L(x) __GAFR(0, x)
31 #define GAFR_U(x) __GAFR(1, x)
32
33 #define BANK_OFF(n) (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
34 #define GPLR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5))
35 #define GPDR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c)
36 #define GPSR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x18)
37 #define GPCR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x24)
38
39 #define PWER_WE35 (1 << 24)
40
41 struct gpio_desc {
42 unsigned valid : 1;
43 unsigned can_wakeup : 1;
44 unsigned keypad_gpio : 1;
45 unsigned dir_inverted : 1;
46 unsigned int mask; /* bit mask in PWER or PKWR */
47 unsigned int mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
48 unsigned long config;
49 };
50
51 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
52
53 static unsigned long gpdr_lpm[4];
54
55 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
56 {
57 unsigned long gafr, mask = GPIO_bit(gpio);
58 int bank = gpio_to_bank(gpio);
59 int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
60 int shft = (gpio & 0xf) << 1;
61 int fn = MFP_AF(c);
62 int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
63
64 if (fn > 3)
65 return -EINVAL;
66
67 /* alternate function and direction at run-time */
68 gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
69 gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
70
71 if (uorl == 0)
72 GAFR_L(bank) = gafr;
73 else
74 GAFR_U(bank) = gafr;
75
76 if (is_out ^ gpio_desc[gpio].dir_inverted)
77 GPDR(gpio) |= mask;
78 else
79 GPDR(gpio) &= ~mask;
80
81 /* alternate function and direction at low power mode */
82 switch (c & MFP_LPM_STATE_MASK) {
83 case MFP_LPM_DRIVE_HIGH:
84 PGSR(bank) |= mask;
85 is_out = 1;
86 break;
87 case MFP_LPM_DRIVE_LOW:
88 PGSR(bank) &= ~mask;
89 is_out = 1;
90 break;
91 case MFP_LPM_INPUT:
92 case MFP_LPM_DEFAULT:
93 break;
94 default:
95 /* warning and fall through, treat as MFP_LPM_DEFAULT */
96 pr_warning("%s: GPIO%d: unsupported low power mode\n",
97 __func__, gpio);
98 break;
99 }
100
101 if (is_out ^ gpio_desc[gpio].dir_inverted)
102 gpdr_lpm[bank] |= mask;
103 else
104 gpdr_lpm[bank] &= ~mask;
105
106 /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
107 * configurations of those pins not able to wakeup
108 */
109 if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
110 pr_warning("%s: GPIO%d unable to wakeup\n",
111 __func__, gpio);
112 return -EINVAL;
113 }
114
115 if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
116 pr_warning("%s: output GPIO%d unable to wakeup\n",
117 __func__, gpio);
118 return -EINVAL;
119 }
120
121 return 0;
122 }
123
124 static inline int __mfp_validate(int mfp)
125 {
126 int gpio = mfp_to_gpio(mfp);
127
128 if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
129 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
130 return -1;
131 }
132
133 return gpio;
134 }
135
136 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
137 {
138 unsigned long flags;
139 unsigned long *c;
140 int i, gpio;
141
142 for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
143
144 gpio = __mfp_validate(MFP_PIN(*c));
145 if (gpio < 0)
146 continue;
147
148 local_irq_save(flags);
149
150 gpio_desc[gpio].config = *c;
151 __mfp_config_gpio(gpio, *c);
152
153 local_irq_restore(flags);
154 }
155 }
156
157 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
158 {
159 unsigned long flags, c;
160 int gpio;
161
162 gpio = __mfp_validate(mfp);
163 if (gpio < 0)
164 return;
165
166 local_irq_save(flags);
167
168 c = gpio_desc[gpio].config;
169 c = (c & ~MFP_LPM_STATE_MASK) | lpm;
170 __mfp_config_gpio(gpio, c);
171
172 local_irq_restore(flags);
173 }
174
175 int gpio_set_wake(unsigned int gpio, unsigned int on)
176 {
177 struct gpio_desc *d;
178 unsigned long c, mux_taken;
179
180 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
181 return -EINVAL;
182
183 d = &gpio_desc[gpio];
184 c = d->config;
185
186 if (!d->valid)
187 return -EINVAL;
188
189 /* Allow keypad GPIOs to wakeup system when
190 * configured as generic GPIOs.
191 */
192 if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
193 (d->config & MFP_LPM_CAN_WAKEUP)) {
194 if (on)
195 PKWR |= d->mask;
196 else
197 PKWR &= ~d->mask;
198 return 0;
199 }
200
201 mux_taken = (PWER & d->mux_mask) & (~d->mask);
202 if (on && mux_taken)
203 return -EBUSY;
204
205 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
206 if (on) {
207 PWER = (PWER & ~d->mux_mask) | d->mask;
208
209 if (c & MFP_LPM_EDGE_RISE)
210 PRER |= d->mask;
211 else
212 PRER &= ~d->mask;
213
214 if (c & MFP_LPM_EDGE_FALL)
215 PFER |= d->mask;
216 else
217 PFER &= ~d->mask;
218 } else {
219 PWER &= ~d->mask;
220 PRER &= ~d->mask;
221 PFER &= ~d->mask;
222 }
223 }
224 return 0;
225 }
226
227 #ifdef CONFIG_PXA25x
228 static void __init pxa25x_mfp_init(void)
229 {
230 int i;
231
232 /* running before pxa_gpio_probe() */
233 #ifdef CONFIG_CPU_PXA26x
234 pxa_last_gpio = 89;
235 #else
236 pxa_last_gpio = 84;
237 #endif
238 for (i = 0; i <= pxa_last_gpio; i++)
239 gpio_desc[i].valid = 1;
240
241 for (i = 0; i <= 15; i++) {
242 gpio_desc[i].can_wakeup = 1;
243 gpio_desc[i].mask = GPIO_bit(i);
244 }
245
246 /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
247 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
248 */
249 for (i = 86; i <= pxa_last_gpio; i++)
250 gpio_desc[i].dir_inverted = 1;
251 }
252 #else
253 static inline void pxa25x_mfp_init(void) {}
254 #endif /* CONFIG_PXA25x */
255
256 #ifdef CONFIG_PXA27x
257 static int pxa27x_pkwr_gpio[] = {
258 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
259 95, 96, 97, 98, 99, 100, 101, 102
260 };
261
262 int keypad_set_wake(unsigned int on)
263 {
264 unsigned int i, gpio, mask = 0;
265 struct gpio_desc *d;
266
267 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
268
269 gpio = pxa27x_pkwr_gpio[i];
270 d = &gpio_desc[gpio];
271
272 /* skip if configured as generic GPIO */
273 if (MFP_AF(d->config) == 0)
274 continue;
275
276 if (d->config & MFP_LPM_CAN_WAKEUP)
277 mask |= gpio_desc[gpio].mask;
278 }
279
280 if (on)
281 PKWR |= mask;
282 else
283 PKWR &= ~mask;
284 return 0;
285 }
286
287 #define PWER_WEMUX2_GPIO38 (1 << 16)
288 #define PWER_WEMUX2_GPIO53 (2 << 16)
289 #define PWER_WEMUX2_GPIO40 (3 << 16)
290 #define PWER_WEMUX2_GPIO36 (4 << 16)
291 #define PWER_WEMUX2_MASK (7 << 16)
292 #define PWER_WEMUX3_GPIO31 (1 << 19)
293 #define PWER_WEMUX3_GPIO113 (2 << 19)
294 #define PWER_WEMUX3_MASK (3 << 19)
295
296 #define INIT_GPIO_DESC_MUXED(mux, gpio) \
297 do { \
298 gpio_desc[(gpio)].can_wakeup = 1; \
299 gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \
300 gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \
301 } while (0)
302
303 static void __init pxa27x_mfp_init(void)
304 {
305 int i, gpio;
306
307 pxa_last_gpio = 120; /* running before pxa_gpio_probe() */
308 for (i = 0; i <= pxa_last_gpio; i++) {
309 /* skip GPIO2, 5, 6, 7, 8, they are not
310 * valid pins allow configuration
311 */
312 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
313 continue;
314
315 gpio_desc[i].valid = 1;
316 }
317
318 /* Keypad GPIOs */
319 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
320 gpio = pxa27x_pkwr_gpio[i];
321 gpio_desc[gpio].can_wakeup = 1;
322 gpio_desc[gpio].keypad_gpio = 1;
323 gpio_desc[gpio].mask = 1 << i;
324 }
325
326 /* Overwrite GPIO13 as a PWER wakeup source */
327 for (i = 0; i <= 15; i++) {
328 /* skip GPIO2, 5, 6, 7, 8 */
329 if (GPIO_bit(i) & 0x1e4)
330 continue;
331
332 gpio_desc[i].can_wakeup = 1;
333 gpio_desc[i].mask = GPIO_bit(i);
334 }
335
336 gpio_desc[35].can_wakeup = 1;
337 gpio_desc[35].mask = PWER_WE35;
338
339 INIT_GPIO_DESC_MUXED(WEMUX3, 31);
340 INIT_GPIO_DESC_MUXED(WEMUX3, 113);
341 INIT_GPIO_DESC_MUXED(WEMUX2, 38);
342 INIT_GPIO_DESC_MUXED(WEMUX2, 53);
343 INIT_GPIO_DESC_MUXED(WEMUX2, 40);
344 INIT_GPIO_DESC_MUXED(WEMUX2, 36);
345 }
346 #else
347 static inline void pxa27x_mfp_init(void) {}
348 #endif /* CONFIG_PXA27x */
349
350 #ifdef CONFIG_PM
351 static unsigned long saved_gafr[2][4];
352 static unsigned long saved_gpdr[4];
353 static unsigned long saved_gplr[4];
354 static unsigned long saved_pgsr[4];
355
356 static int pxa2xx_mfp_suspend(void)
357 {
358 int i;
359
360 /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
361 for (i = 0; i < pxa_last_gpio; i++) {
362 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
363 (GPDR(i) & GPIO_bit(i))) {
364 if (GPLR(i) & GPIO_bit(i))
365 PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
366 else
367 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
368 }
369 }
370
371 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
372 saved_gafr[0][i] = GAFR_L(i);
373 saved_gafr[1][i] = GAFR_U(i);
374 saved_gpdr[i] = GPDR(i * 32);
375 saved_gplr[i] = GPLR(i * 32);
376 saved_pgsr[i] = PGSR(i);
377
378 GPSR(i * 32) = PGSR(i);
379 GPCR(i * 32) = ~PGSR(i);
380 }
381
382 /* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */
383 for (i = 0; i < pxa_last_gpio; i++) {
384 if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) ||
385 ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
386 (saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i))))
387 GPDR(i) |= GPIO_bit(i);
388 else
389 GPDR(i) &= ~GPIO_bit(i);
390 }
391
392 return 0;
393 }
394
395 static void pxa2xx_mfp_resume(void)
396 {
397 int i;
398
399 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
400 GAFR_L(i) = saved_gafr[0][i];
401 GAFR_U(i) = saved_gafr[1][i];
402 GPSR(i * 32) = saved_gplr[i];
403 GPCR(i * 32) = ~saved_gplr[i];
404 GPDR(i * 32) = saved_gpdr[i];
405 PGSR(i) = saved_pgsr[i];
406 }
407 PSSR = PSSR_RDH | PSSR_PH;
408 }
409 #else
410 #define pxa2xx_mfp_suspend NULL
411 #define pxa2xx_mfp_resume NULL
412 #endif
413
414 struct syscore_ops pxa2xx_mfp_syscore_ops = {
415 .suspend = pxa2xx_mfp_suspend,
416 .resume = pxa2xx_mfp_resume,
417 };
418
419 static int __init pxa2xx_mfp_init(void)
420 {
421 int i;
422
423 if (!cpu_is_pxa2xx())
424 return 0;
425
426 if (cpu_is_pxa25x())
427 pxa25x_mfp_init();
428
429 if (cpu_is_pxa27x())
430 pxa27x_mfp_init();
431
432 /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
433 PSSR = PSSR_RDH;
434
435 /* initialize gafr_run[], pgsr_lpm[] from existing values */
436 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
437 gpdr_lpm[i] = GPDR(i * 32);
438
439 return 0;
440 }
441 postcore_initcall(pxa2xx_mfp_init);
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