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
__mfp_config_gpio(unsigned gpio,unsigned long c)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
__mfp_validate(int mfp)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
pxa2xx_mfp_config(unsigned long * mfp_cfgs,int num)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
pxa2xx_mfp_set_lpm(int mfp,unsigned long lpm)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
gpio_set_wake(unsigned int gpio,unsigned int on)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
pxa25x_mfp_init(void)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
pxa25x_mfp_init(void)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
keypad_set_wake(unsigned int on)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
pxa27x_mfp_init(void)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
pxa27x_mfp_init(void)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
pxa2xx_mfp_suspend(struct sys_device * d,pm_message_t state)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
pxa2xx_mfp_resume(struct sys_device * d)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
pxa2xx_mfp_init(void)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