?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
x86/boot: Rename overlapping memcpy() to memmove()
[linux/fpc-iii.git] / arch / arm / mach-pxa / mfp-pxa2xx.c
blob3732aec767509694771db7950253ce101874c4c4
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 "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_warn("%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_warn("%s: GPIO%d unable to wakeup\n", __func__, gpio);
111 return -EINVAL;
112 }
113
114 if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
115 pr_warn("%s: output GPIO%d unable to wakeup\n", __func__, gpio);
116 return -EINVAL;
117 }
118
119 return 0;
120 }
121
122 static inline int __mfp_validate(int mfp)
123 {
124 int gpio = mfp_to_gpio(mfp);
125
126 if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
127 pr_warn("%s: GPIO%d is invalid pin\n", __func__, gpio);
128 return -1;
129 }
130
131 return gpio;
132 }
133
134 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
135 {
136 unsigned long flags;
137 unsigned long *c;
138 int i, gpio;
139
140 for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
141
142 gpio = __mfp_validate(MFP_PIN(*c));
143 if (gpio < 0)
144 continue;
145
146 local_irq_save(flags);
147
148 gpio_desc[gpio].config = *c;
149 __mfp_config_gpio(gpio, *c);
150
151 local_irq_restore(flags);
152 }
153 }
154
155 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
156 {
157 unsigned long flags, c;
158 int gpio;
159
160 gpio = __mfp_validate(mfp);
161 if (gpio < 0)
162 return;
163
164 local_irq_save(flags);
165
166 c = gpio_desc[gpio].config;
167 c = (c & ~MFP_LPM_STATE_MASK) | lpm;
168 __mfp_config_gpio(gpio, c);
169
170 local_irq_restore(flags);
171 }
172
173 int gpio_set_wake(unsigned int gpio, unsigned int on)
174 {
175 struct gpio_desc *d;
176 unsigned long c, mux_taken;
177
178 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
179 return -EINVAL;
180
181 d = &gpio_desc[gpio];
182 c = d->config;
183
184 if (!d->valid)
185 return -EINVAL;
186
187 /* Allow keypad GPIOs to wakeup system when
188 * configured as generic GPIOs.
189 */
190 if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
191 (d->config & MFP_LPM_CAN_WAKEUP)) {
192 if (on)
193 PKWR |= d->mask;
194 else
195 PKWR &= ~d->mask;
196 return 0;
197 }
198
199 mux_taken = (PWER & d->mux_mask) & (~d->mask);
200 if (on && mux_taken)
201 return -EBUSY;
202
203 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
204 if (on) {
205 PWER = (PWER & ~d->mux_mask) | d->mask;
206
207 if (c & MFP_LPM_EDGE_RISE)
208 PRER |= d->mask;
209 else
210 PRER &= ~d->mask;
211
212 if (c & MFP_LPM_EDGE_FALL)
213 PFER |= d->mask;
214 else
215 PFER &= ~d->mask;
216 } else {
217 PWER &= ~d->mask;
218 PRER &= ~d->mask;
219 PFER &= ~d->mask;
220 }
221 }
222 return 0;
223 }
224
225 #ifdef CONFIG_PXA25x
226 static void __init pxa25x_mfp_init(void)
227 {
228 int i;
229
230 /* running before pxa_gpio_probe() */
231 #ifdef CONFIG_CPU_PXA26x
232 pxa_last_gpio = 89;
233 #else
234 pxa_last_gpio = 84;
235 #endif
236 for (i = 0; i <= pxa_last_gpio; i++)
237 gpio_desc[i].valid = 1;
238
239 for (i = 0; i <= 15; i++) {
240 gpio_desc[i].can_wakeup = 1;
241 gpio_desc[i].mask = GPIO_bit(i);
242 }
243
244 /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
245 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
246 */
247 for (i = 86; i <= pxa_last_gpio; i++)
248 gpio_desc[i].dir_inverted = 1;
249 }
250 #else
251 static inline void pxa25x_mfp_init(void) {}
252 #endif /* CONFIG_PXA25x */
253
254 #ifdef CONFIG_PXA27x
255 static int pxa27x_pkwr_gpio[] = {
256 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
257 95, 96, 97, 98, 99, 100, 101, 102
258 };
259
260 int keypad_set_wake(unsigned int on)
261 {
262 unsigned int i, gpio, mask = 0;
263 struct gpio_desc *d;
264
265 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
266
267 gpio = pxa27x_pkwr_gpio[i];
268 d = &gpio_desc[gpio];
269
270 /* skip if configured as generic GPIO */
271 if (MFP_AF(d->config) == 0)
272 continue;
273
274 if (d->config & MFP_LPM_CAN_WAKEUP)
275 mask |= gpio_desc[gpio].mask;
276 }
277
278 if (on)
279 PKWR |= mask;
280 else
281 PKWR &= ~mask;
282 return 0;
283 }
284
285 #define PWER_WEMUX2_GPIO38 (1 << 16)
286 #define PWER_WEMUX2_GPIO53 (2 << 16)
287 #define PWER_WEMUX2_GPIO40 (3 << 16)
288 #define PWER_WEMUX2_GPIO36 (4 << 16)
289 #define PWER_WEMUX2_MASK (7 << 16)
290 #define PWER_WEMUX3_GPIO31 (1 << 19)
291 #define PWER_WEMUX3_GPIO113 (2 << 19)
292 #define PWER_WEMUX3_MASK (3 << 19)
293
294 #define INIT_GPIO_DESC_MUXED(mux, gpio) \
295 do { \
296 gpio_desc[(gpio)].can_wakeup = 1; \
297 gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \
298 gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \
299 } while (0)
300
301 static void __init pxa27x_mfp_init(void)
302 {
303 int i, gpio;
304
305 pxa_last_gpio = 120; /* running before pxa_gpio_probe() */
306 for (i = 0; i <= pxa_last_gpio; i++) {
307 /* skip GPIO2, 5, 6, 7, 8, they are not
308 * valid pins allow configuration
309 */
310 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
311 continue;
312
313 gpio_desc[i].valid = 1;
314 }
315
316 /* Keypad GPIOs */
317 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
318 gpio = pxa27x_pkwr_gpio[i];
319 gpio_desc[gpio].can_wakeup = 1;
320 gpio_desc[gpio].keypad_gpio = 1;
321 gpio_desc[gpio].mask = 1 << i;
322 }
323
324 /* Overwrite GPIO13 as a PWER wakeup source */
325 for (i = 0; i <= 15; i++) {
326 /* skip GPIO2, 5, 6, 7, 8 */
327 if (GPIO_bit(i) & 0x1e4)
328 continue;
329
330 gpio_desc[i].can_wakeup = 1;
331 gpio_desc[i].mask = GPIO_bit(i);
332 }
333
334 gpio_desc[35].can_wakeup = 1;
335 gpio_desc[35].mask = PWER_WE35;
336
337 INIT_GPIO_DESC_MUXED(WEMUX3, 31);
338 INIT_GPIO_DESC_MUXED(WEMUX3, 113);
339 INIT_GPIO_DESC_MUXED(WEMUX2, 38);
340 INIT_GPIO_DESC_MUXED(WEMUX2, 53);
341 INIT_GPIO_DESC_MUXED(WEMUX2, 40);
342 INIT_GPIO_DESC_MUXED(WEMUX2, 36);
343 }
344 #else
345 static inline void pxa27x_mfp_init(void) {}
346 #endif /* CONFIG_PXA27x */
347
348 #ifdef CONFIG_PM
349 static unsigned long saved_gafr[2][4];
350 static unsigned long saved_gpdr[4];
351 static unsigned long saved_gplr[4];
352 static unsigned long saved_pgsr[4];
353
354 static int pxa2xx_mfp_suspend(void)
355 {
356 int i;
357
358 /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
359 for (i = 0; i < pxa_last_gpio; i++) {
360 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
361 (GPDR(i) & GPIO_bit(i))) {
362 if (GPLR(i) & GPIO_bit(i))
363 PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
364 else
365 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
366 }
367 }
368
369 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
370 saved_gafr[0][i] = GAFR_L(i);
371 saved_gafr[1][i] = GAFR_U(i);
372 saved_gpdr[i] = GPDR(i * 32);
373 saved_gplr[i] = GPLR(i * 32);
374 saved_pgsr[i] = PGSR(i);
375
376 GPSR(i * 32) = PGSR(i);
377 GPCR(i * 32) = ~PGSR(i);
378 }
379
380 /* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */
381 for (i = 0; i < pxa_last_gpio; i++) {
382 if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) ||
383 ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
384 (saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i))))
385 GPDR(i) |= GPIO_bit(i);
386 else
387 GPDR(i) &= ~GPIO_bit(i);
388 }
389
390 return 0;
391 }
392
393 static void pxa2xx_mfp_resume(void)
394 {
395 int i;
396
397 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
398 GAFR_L(i) = saved_gafr[0][i];
399 GAFR_U(i) = saved_gafr[1][i];
400 GPSR(i * 32) = saved_gplr[i];
401 GPCR(i * 32) = ~saved_gplr[i];
402 GPDR(i * 32) = saved_gpdr[i];
403 PGSR(i) = saved_pgsr[i];
404 }
405 PSSR = PSSR_RDH | PSSR_PH;
406 }
407 #else
408 #define pxa2xx_mfp_suspend NULL
409 #define pxa2xx_mfp_resume NULL
410 #endif
411
412 struct syscore_ops pxa2xx_mfp_syscore_ops = {
413 .suspend = pxa2xx_mfp_suspend,
414 .resume = pxa2xx_mfp_resume,
415 };
416
417 static int __init pxa2xx_mfp_init(void)
418 {
419 int i;
420
421 if (!cpu_is_pxa2xx())
422 return 0;
423
424 if (cpu_is_pxa25x())
425 pxa25x_mfp_init();
426
427 if (cpu_is_pxa27x())
428 pxa27x_mfp_init();
429
430 /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
431 PSSR = PSSR_RDH;
432
433 /* initialize gafr_run[], pgsr_lpm[] from existing values */
434 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
435 gpdr_lpm[i] = GPDR(i * 32);
436
437 return 0;
438 }
439 postcore_initcall(pxa2xx_mfp_init);
Linux with added FPC-III support