2 * linux/arch/arm/mach-pxa/mfp-pxa2xx.c
4 * PXA2xx pin mux configuration support
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.
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.
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>
21 #include <linux/syscore_ops.h>
23 #include <mach/pxa2xx-regs.h>
24 #include "mfp-pxa2xx.h"
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)
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)
39 #define PWER_WE35 (1 << 24)
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 */
51 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
53 static unsigned long gpdr_lpm[4];
55 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
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;
62 int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
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);
76 if (is_out ^ gpio_desc[gpio].dir_inverted)
81 /* alternate function and direction at low power mode */
82 switch (c & MFP_LPM_STATE_MASK) {
83 case MFP_LPM_DRIVE_HIGH:
87 case MFP_LPM_DRIVE_LOW:
95 /* warning and fall through, treat as MFP_LPM_DEFAULT */
96 pr_warn("%s: GPIO%d: unsupported low power mode\n",
101 if (is_out ^ gpio_desc[gpio].dir_inverted)
102 gpdr_lpm[bank] |= mask;
104 gpdr_lpm[bank] &= ~mask;
106 /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
107 * configurations of those pins not able to wakeup
109 if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
110 pr_warn("%s: GPIO%d unable to wakeup\n", __func__, gpio);
114 if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
115 pr_warn("%s: output GPIO%d unable to wakeup\n", __func__, gpio);
122 static inline int __mfp_validate(int mfp)
124 int gpio = mfp_to_gpio(mfp);
126 if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
127 pr_warn("%s: GPIO%d is invalid pin\n", __func__, gpio);
134 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
140 for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
142 gpio = __mfp_validate(MFP_PIN(*c));
146 local_irq_save(flags);
148 gpio_desc[gpio].config = *c;
149 __mfp_config_gpio(gpio, *c);
151 local_irq_restore(flags);
155 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
157 unsigned long flags, c;
160 gpio = __mfp_validate(mfp);
164 local_irq_save(flags);
166 c = gpio_desc[gpio].config;
167 c = (c & ~MFP_LPM_STATE_MASK) | lpm;
168 __mfp_config_gpio(gpio, c);
170 local_irq_restore(flags);
173 int gpio_set_wake(unsigned int gpio, unsigned int on)
176 unsigned long c, mux_taken;
178 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
181 d = &gpio_desc[gpio];
187 /* Allow keypad GPIOs to wakeup system when
188 * configured as generic GPIOs.
190 if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
191 (d->config & MFP_LPM_CAN_WAKEUP)) {
199 mux_taken = (PWER & d->mux_mask) & (~d->mask);
203 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
205 PWER = (PWER & ~d->mux_mask) | d->mask;
207 if (c & MFP_LPM_EDGE_RISE)
212 if (c & MFP_LPM_EDGE_FALL)
226 static void __init pxa25x_mfp_init(void)
230 /* running before pxa_gpio_probe() */
231 #ifdef CONFIG_CPU_PXA26x
236 for (i = 0; i <= pxa_last_gpio; i++)
237 gpio_desc[i].valid = 1;
239 for (i = 0; i <= 15; i++) {
240 gpio_desc[i].can_wakeup = 1;
241 gpio_desc[i].mask = GPIO_bit(i);
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.
247 for (i = 86; i <= pxa_last_gpio; i++)
248 gpio_desc[i].dir_inverted = 1;
251 static inline void pxa25x_mfp_init(void) {}
252 #endif /* CONFIG_PXA25x */
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
260 int keypad_set_wake(unsigned int on)
262 unsigned int i, gpio, mask = 0;
265 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
267 gpio = pxa27x_pkwr_gpio[i];
268 d = &gpio_desc[gpio];
270 /* skip if configured as generic GPIO */
271 if (MFP_AF(d->config) == 0)
274 if (d->config & MFP_LPM_CAN_WAKEUP)
275 mask |= gpio_desc[gpio].mask;
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)
294 #define INIT_GPIO_DESC_MUXED(mux, gpio) \
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; \
301 static void __init pxa27x_mfp_init(void)
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
310 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
313 gpio_desc[i].valid = 1;
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;
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)
330 gpio_desc[i].can_wakeup = 1;
331 gpio_desc[i].mask = GPIO_bit(i);
334 gpio_desc[35].can_wakeup = 1;
335 gpio_desc[35].mask = PWER_WE35;
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);
345 static inline void pxa27x_mfp_init(void) {}
346 #endif /* CONFIG_PXA27x */
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];
354 static int pxa2xx_mfp_suspend(void)
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);
365 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
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);
376 GPSR(i * 32) = PGSR(i);
377 GPCR(i * 32) = ~PGSR(i);
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);
387 GPDR(i) &= ~GPIO_bit(i);
393 static void pxa2xx_mfp_resume(void)
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];
405 PSSR = PSSR_RDH | PSSR_PH;
408 #define pxa2xx_mfp_suspend NULL
409 #define pxa2xx_mfp_resume NULL
412 struct syscore_ops pxa2xx_mfp_syscore_ops = {
413 .suspend = pxa2xx_mfp_suspend,
414 .resume = pxa2xx_mfp_resume,
417 static int __init pxa2xx_mfp_init(void)
421 if (!cpu_is_pxa2xx())
430 /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
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);
439 postcore_initcall(pxa2xx_mfp_init);