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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 | |
16 | #include <linux/module.h> |
17 | #include <linux/kernel.h> |
18 | #include <linux/init.h> |
19 | #include <linux/sysdev.h> |
20 | |
21 | #include <mach/gpio.h> |
22 | #include <mach/pxa2xx-regs.h> |
23 | #include <mach/mfp-pxa2xx.h> |
24 | |
25 | #include "generic.h" |
26 | |
27 | #define PGSR(x) __REG2(0x40F00020, (x) << 2) |
28 | #define __GAFR(u, x) __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3) |
29 | #define GAFR_L(x) __GAFR(0, x) |
30 | #define GAFR_U(x) __GAFR(1, x) |
31 | |
32 | #define PWER_WE35 (1 << 24) |
33 | |
34 | struct gpio_desc { |
35 | unsigned valid : 1; |
36 | unsigned can_wakeup : 1; |
37 | unsigned keypad_gpio : 1; |
38 | unsigned dir_inverted : 1; |
39 | unsigned int mask; /* bit mask in PWER or PKWR */ |
40 | unsigned int mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */ |
41 | unsigned long config; |
42 | }; |
43 | |
44 | static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1]; |
45 | |
46 | static unsigned long gpdr_lpm[4]; |
47 | |
48 | static int __mfp_config_gpio(unsigned gpio, unsigned long c) |
49 | { |
50 | unsigned long gafr, mask = GPIO_bit(gpio); |
51 | int bank = gpio_to_bank(gpio); |
52 | int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */ |
53 | int shft = (gpio & 0xf) << 1; |
54 | int fn = MFP_AF(c); |
55 | int is_out = (c & MFP_DIR_OUT) ? 1 : 0; |
56 | |
57 | if (fn > 3) |
58 | return -EINVAL; |
59 | |
60 | /* alternate function and direction at run-time */ |
61 | gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank); |
62 | gafr = (gafr & ~(0x3 << shft)) | (fn << shft); |
63 | |
64 | if (uorl == 0) |
65 | GAFR_L(bank) = gafr; |
66 | else |
67 | GAFR_U(bank) = gafr; |
68 | |
69 | if (is_out ^ gpio_desc[gpio].dir_inverted) |
70 | GPDR(gpio) |= mask; |
71 | else |
72 | GPDR(gpio) &= ~mask; |
73 | |
74 | /* alternate function and direction at low power mode */ |
75 | switch (c & MFP_LPM_STATE_MASK) { |
76 | case MFP_LPM_DRIVE_HIGH: |
77 | PGSR(bank) |= mask; |
78 | is_out = 1; |
79 | break; |
80 | case MFP_LPM_DRIVE_LOW: |
81 | PGSR(bank) &= ~mask; |
82 | is_out = 1; |
83 | break; |
84 | case MFP_LPM_INPUT: |
85 | case MFP_LPM_DEFAULT: |
86 | break; |
87 | default: |
88 | /* warning and fall through, treat as MFP_LPM_DEFAULT */ |
89 | pr_warning("%s: GPIO%d: unsupported low power mode\n", |
90 | __func__, gpio); |
91 | break; |
92 | } |
93 | |
94 | if (is_out ^ gpio_desc[gpio].dir_inverted) |
95 | gpdr_lpm[bank] |= mask; |
96 | else |
97 | gpdr_lpm[bank] &= ~mask; |
98 | |
99 | /* give early warning if MFP_LPM_CAN_WAKEUP is set on the |
100 | * configurations of those pins not able to wakeup |
101 | */ |
102 | if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) { |
103 | pr_warning("%s: GPIO%d unable to wakeup\n", |
104 | __func__, gpio); |
105 | return -EINVAL; |
106 | } |
107 | |
108 | if ((c & MFP_LPM_CAN_WAKEUP) && is_out) { |
109 | pr_warning("%s: output GPIO%d unable to wakeup\n", |
110 | __func__, gpio); |
111 | return -EINVAL; |
112 | } |
113 | |
114 | return 0; |
115 | } |
116 | |
117 | static inline int __mfp_validate(int mfp) |
118 | { |
119 | int gpio = mfp_to_gpio(mfp); |
120 | |
121 | if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) { |
122 | pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio); |
123 | return -1; |
124 | } |
125 | |
126 | return gpio; |
127 | } |
128 | |
129 | void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num) |
130 | { |
131 | unsigned long flags; |
132 | unsigned long *c; |
133 | int i, gpio; |
134 | |
135 | for (i = 0, c = mfp_cfgs; i < num; i++, c++) { |
136 | |
137 | gpio = __mfp_validate(MFP_PIN(*c)); |
138 | if (gpio < 0) |
139 | continue; |
140 | |
141 | local_irq_save(flags); |
142 | |
143 | gpio_desc[gpio].config = *c; |
144 | __mfp_config_gpio(gpio, *c); |
145 | |
146 | local_irq_restore(flags); |
147 | } |
148 | } |
149 | |
150 | void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm) |
151 | { |
152 | unsigned long flags, c; |
153 | int gpio; |
154 | |
155 | gpio = __mfp_validate(mfp); |
156 | if (gpio < 0) |
157 | return; |
158 | |
159 | local_irq_save(flags); |
160 | |
161 | c = gpio_desc[gpio].config; |
162 | c = (c & ~MFP_LPM_STATE_MASK) | lpm; |
163 | __mfp_config_gpio(gpio, c); |
164 | |
165 | local_irq_restore(flags); |
166 | } |
167 | |
168 | int gpio_set_wake(unsigned int gpio, unsigned int on) |
169 | { |
170 | struct gpio_desc *d; |
171 | unsigned long c, mux_taken; |
172 | |
173 | if (gpio > mfp_to_gpio(MFP_PIN_GPIO127)) |
174 | return -EINVAL; |
175 | |
176 | d = &gpio_desc[gpio]; |
177 | c = d->config; |
178 | |
179 | if (!d->valid) |
180 | return -EINVAL; |
181 | |
182 | /* Allow keypad GPIOs to wakeup system when |
183 | * configured as generic GPIOs. |
184 | */ |
185 | if (d->keypad_gpio && (MFP_AF(d->config) == 0) && |
186 | (d->config & MFP_LPM_CAN_WAKEUP)) { |
187 | if (on) |
188 | PKWR |= d->mask; |
189 | else |
190 | PKWR &= ~d->mask; |
191 | return 0; |
192 | } |
193 | |
194 | mux_taken = (PWER & d->mux_mask) & (~d->mask); |
195 | if (on && mux_taken) |
196 | return -EBUSY; |
197 | |
198 | if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) { |
199 | if (on) { |
200 | PWER = (PWER & ~d->mux_mask) | d->mask; |
201 | |
202 | if (c & MFP_LPM_EDGE_RISE) |
203 | PRER |= d->mask; |
204 | else |
205 | PRER &= ~d->mask; |
206 | |
207 | if (c & MFP_LPM_EDGE_FALL) |
208 | PFER |= d->mask; |
209 | else |
210 | PFER &= ~d->mask; |
211 | } else { |
212 | PWER &= ~d->mask; |
213 | PRER &= ~d->mask; |
214 | PFER &= ~d->mask; |
215 | } |
216 | } |
217 | return 0; |
218 | } |
219 | |
220 | #ifdef CONFIG_PXA25x |
221 | static void __init pxa25x_mfp_init(void) |
222 | { |
223 | int i; |
224 | |
225 | for (i = 0; i <= pxa_last_gpio; i++) |
226 | gpio_desc[i].valid = 1; |
227 | |
228 | for (i = 0; i <= 15; i++) { |
229 | gpio_desc[i].can_wakeup = 1; |
230 | gpio_desc[i].mask = GPIO_bit(i); |
231 | } |
232 | |
233 | /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the |
234 | * direction bit inverted in GPDR2. See PXA26x DM 4.1.1. |
235 | */ |
236 | for (i = 86; i <= pxa_last_gpio; i++) |
237 | gpio_desc[i].dir_inverted = 1; |
238 | } |
239 | #else |
240 | static inline void pxa25x_mfp_init(void) {} |
241 | #endif /* CONFIG_PXA25x */ |
242 | |
243 | #ifdef CONFIG_PXA27x |
244 | static int pxa27x_pkwr_gpio[] = { |
245 | 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94, |
246 | 95, 96, 97, 98, 99, 100, 101, 102 |
247 | }; |
248 | |
249 | int keypad_set_wake(unsigned int on) |
250 | { |
251 | unsigned int i, gpio, mask = 0; |
252 | struct gpio_desc *d; |
253 | |
254 | for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { |
255 | |
256 | gpio = pxa27x_pkwr_gpio[i]; |
257 | d = &gpio_desc[gpio]; |
258 | |
259 | /* skip if configured as generic GPIO */ |
260 | if (MFP_AF(d->config) == 0) |
261 | continue; |
262 | |
263 | if (d->config & MFP_LPM_CAN_WAKEUP) |
264 | mask |= gpio_desc[gpio].mask; |
265 | } |
266 | |
267 | if (on) |
268 | PKWR |= mask; |
269 | else |
270 | PKWR &= ~mask; |
271 | return 0; |
272 | } |
273 | |
274 | #define PWER_WEMUX2_GPIO38 (1 << 16) |
275 | #define PWER_WEMUX2_GPIO53 (2 << 16) |
276 | #define PWER_WEMUX2_GPIO40 (3 << 16) |
277 | #define PWER_WEMUX2_GPIO36 (4 << 16) |
278 | #define PWER_WEMUX2_MASK (7 << 16) |
279 | #define PWER_WEMUX3_GPIO31 (1 << 19) |
280 | #define PWER_WEMUX3_GPIO113 (2 << 19) |
281 | #define PWER_WEMUX3_MASK (3 << 19) |
282 | |
283 | #define INIT_GPIO_DESC_MUXED(mux, gpio) \ |
284 | do { \ |
285 | gpio_desc[(gpio)].can_wakeup = 1; \ |
286 | gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \ |
287 | gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \ |
288 | } while (0) |
289 | |
290 | static void __init pxa27x_mfp_init(void) |
291 | { |
292 | int i, gpio; |
293 | |
294 | for (i = 0; i <= pxa_last_gpio; i++) { |
295 | /* skip GPIO2, 5, 6, 7, 8, they are not |
296 | * valid pins allow configuration |
297 | */ |
298 | if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8) |
299 | continue; |
300 | |
301 | gpio_desc[i].valid = 1; |
302 | } |
303 | |
304 | /* Keypad GPIOs */ |
305 | for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { |
306 | gpio = pxa27x_pkwr_gpio[i]; |
307 | gpio_desc[gpio].can_wakeup = 1; |
308 | gpio_desc[gpio].keypad_gpio = 1; |
309 | gpio_desc[gpio].mask = 1 << i; |
310 | } |
311 | |
312 | /* Overwrite GPIO13 as a PWER wakeup source */ |
313 | for (i = 0; i <= 15; i++) { |
314 | /* skip GPIO2, 5, 6, 7, 8 */ |
315 | if (GPIO_bit(i) & 0x1e4) |
316 | continue; |
317 | |
318 | gpio_desc[i].can_wakeup = 1; |
319 | gpio_desc[i].mask = GPIO_bit(i); |
320 | } |
321 | |
322 | gpio_desc[35].can_wakeup = 1; |
323 | gpio_desc[35].mask = PWER_WE35; |
324 | |
325 | INIT_GPIO_DESC_MUXED(WEMUX3, 31); |
326 | INIT_GPIO_DESC_MUXED(WEMUX3, 113); |
327 | INIT_GPIO_DESC_MUXED(WEMUX2, 38); |
328 | INIT_GPIO_DESC_MUXED(WEMUX2, 53); |
329 | INIT_GPIO_DESC_MUXED(WEMUX2, 40); |
330 | INIT_GPIO_DESC_MUXED(WEMUX2, 36); |
331 | } |
332 | #else |
333 | static inline void pxa27x_mfp_init(void) {} |
334 | #endif /* CONFIG_PXA27x */ |
335 | |
336 | #ifdef CONFIG_PM |
337 | static unsigned long saved_gafr[2][4]; |
338 | static unsigned long saved_gpdr[4]; |
339 | static unsigned long saved_pgsr[4]; |
340 | |
341 | static int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state) |
342 | { |
343 | int i; |
344 | |
345 | /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */ |
346 | for (i = 0; i < pxa_last_gpio; i++) { |
347 | if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) && |
348 | (GPDR(i) & GPIO_bit(i))) { |
349 | if (GPLR(i) & GPIO_bit(i)) |
350 | PGSR(i) |= GPIO_bit(i); |
351 | else |
352 | PGSR(i) &= ~GPIO_bit(i); |
353 | } |
354 | } |
355 | |
356 | for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { |
357 | |
358 | saved_gafr[0][i] = GAFR_L(i); |
359 | saved_gafr[1][i] = GAFR_U(i); |
360 | saved_gpdr[i] = GPDR(i * 32); |
361 | saved_pgsr[i] = PGSR(i); |
362 | |
363 | GPDR(i * 32) = gpdr_lpm[i]; |
364 | } |
365 | return 0; |
366 | } |
367 | |
368 | static int pxa2xx_mfp_resume(struct sys_device *d) |
369 | { |
370 | int i; |
371 | |
372 | for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { |
373 | GAFR_L(i) = saved_gafr[0][i]; |
374 | GAFR_U(i) = saved_gafr[1][i]; |
375 | GPDR(i * 32) = saved_gpdr[i]; |
376 | PGSR(i) = saved_pgsr[i]; |
377 | } |
378 | PSSR = PSSR_RDH | PSSR_PH; |
379 | return 0; |
380 | } |
381 | #else |
382 | #define pxa2xx_mfp_suspend NULL |
383 | #define pxa2xx_mfp_resume NULL |
384 | #endif |
385 | |
386 | struct sysdev_class pxa2xx_mfp_sysclass = { |
387 | .name = "mfp", |
388 | .suspend = pxa2xx_mfp_suspend, |
389 | .resume = pxa2xx_mfp_resume, |
390 | }; |
391 | |
392 | static int __init pxa2xx_mfp_init(void) |
393 | { |
394 | int i; |
395 | |
396 | if (!cpu_is_pxa2xx()) |
397 | return 0; |
398 | |
399 | if (cpu_is_pxa25x()) |
400 | pxa25x_mfp_init(); |
401 | |
402 | if (cpu_is_pxa27x()) |
403 | pxa27x_mfp_init(); |
404 | |
405 | /* clear RDH bit to enable GPIO receivers after reset/sleep exit */ |
406 | PSSR = PSSR_RDH; |
407 | |
408 | /* initialize gafr_run[], pgsr_lpm[] from existing values */ |
409 | for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) |
410 | gpdr_lpm[i] = GPDR(i * 32); |
411 | |
412 | return sysdev_class_register(&pxa2xx_mfp_sysclass); |
413 | } |
414 | postcore_initcall(pxa2xx_mfp_init); |
415 |
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