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 <mach/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)
37 #define PWER_WE35 (1 << 24)
41 unsigned can_wakeup : 1;
42 unsigned keypad_gpio : 1;
43 unsigned dir_inverted : 1;
44 unsigned int mask; /* bit mask in PWER or PKWR */
45 unsigned int mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
49 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
51 static unsigned long gpdr_lpm[4];
53 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
55 unsigned long gafr, mask = GPIO_bit(gpio);
56 int bank = gpio_to_bank(gpio);
57 int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
58 int shft = (gpio & 0xf) << 1;
60 int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
65 /* alternate function and direction at run-time */
66 gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
67 gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
74 if (is_out ^ gpio_desc[gpio].dir_inverted)
79 /* alternate function and direction at low power mode */
80 switch (c & MFP_LPM_STATE_MASK) {
81 case MFP_LPM_DRIVE_HIGH:
85 case MFP_LPM_DRIVE_LOW:
93 /* warning and fall through, treat as MFP_LPM_DEFAULT */
94 pr_warning("%s: GPIO%d: unsupported low power mode\n",
99 if (is_out ^ gpio_desc[gpio].dir_inverted)
100 gpdr_lpm[bank] |= mask;
102 gpdr_lpm[bank] &= ~mask;
104 /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
105 * configurations of those pins not able to wakeup
107 if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
108 pr_warning("%s: GPIO%d unable to wakeup\n",
113 if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
114 pr_warning("%s: output GPIO%d unable to wakeup\n",
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_warning("%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 for (i = 0; i <= pxa_last_gpio; i++)
231 gpio_desc[i].valid = 1;
233 for (i = 0; i <= 15; i++) {
234 gpio_desc[i].can_wakeup = 1;
235 gpio_desc[i].mask = GPIO_bit(i);
238 /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
239 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
241 for (i = 86; i <= pxa_last_gpio; i++)
242 gpio_desc[i].dir_inverted = 1;
245 static inline void pxa25x_mfp_init(void) {}
246 #endif /* CONFIG_PXA25x */
249 static int pxa27x_pkwr_gpio[] = {
250 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
251 95, 96, 97, 98, 99, 100, 101, 102
254 int keypad_set_wake(unsigned int on)
256 unsigned int i, gpio, mask = 0;
259 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
261 gpio = pxa27x_pkwr_gpio[i];
262 d = &gpio_desc[gpio];
264 /* skip if configured as generic GPIO */
265 if (MFP_AF(d->config) == 0)
268 if (d->config & MFP_LPM_CAN_WAKEUP)
269 mask |= gpio_desc[gpio].mask;
279 #define PWER_WEMUX2_GPIO38 (1 << 16)
280 #define PWER_WEMUX2_GPIO53 (2 << 16)
281 #define PWER_WEMUX2_GPIO40 (3 << 16)
282 #define PWER_WEMUX2_GPIO36 (4 << 16)
283 #define PWER_WEMUX2_MASK (7 << 16)
284 #define PWER_WEMUX3_GPIO31 (1 << 19)
285 #define PWER_WEMUX3_GPIO113 (2 << 19)
286 #define PWER_WEMUX3_MASK (3 << 19)
288 #define INIT_GPIO_DESC_MUXED(mux, gpio) \
290 gpio_desc[(gpio)].can_wakeup = 1; \
291 gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \
292 gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \
295 static void __init pxa27x_mfp_init(void)
299 for (i = 0; i <= pxa_last_gpio; i++) {
300 /* skip GPIO2, 5, 6, 7, 8, they are not
301 * valid pins allow configuration
303 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
306 gpio_desc[i].valid = 1;
310 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
311 gpio = pxa27x_pkwr_gpio[i];
312 gpio_desc[gpio].can_wakeup = 1;
313 gpio_desc[gpio].keypad_gpio = 1;
314 gpio_desc[gpio].mask = 1 << i;
317 /* Overwrite GPIO13 as a PWER wakeup source */
318 for (i = 0; i <= 15; i++) {
319 /* skip GPIO2, 5, 6, 7, 8 */
320 if (GPIO_bit(i) & 0x1e4)
323 gpio_desc[i].can_wakeup = 1;
324 gpio_desc[i].mask = GPIO_bit(i);
327 gpio_desc[35].can_wakeup = 1;
328 gpio_desc[35].mask = PWER_WE35;
330 INIT_GPIO_DESC_MUXED(WEMUX3, 31);
331 INIT_GPIO_DESC_MUXED(WEMUX3, 113);
332 INIT_GPIO_DESC_MUXED(WEMUX2, 38);
333 INIT_GPIO_DESC_MUXED(WEMUX2, 53);
334 INIT_GPIO_DESC_MUXED(WEMUX2, 40);
335 INIT_GPIO_DESC_MUXED(WEMUX2, 36);
338 static inline void pxa27x_mfp_init(void) {}
339 #endif /* CONFIG_PXA27x */
342 static unsigned long saved_gafr[2][4];
343 static unsigned long saved_gpdr[4];
344 static unsigned long saved_pgsr[4];
346 static int pxa2xx_mfp_suspend(void)
350 /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
351 for (i = 0; i < pxa_last_gpio; i++) {
352 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
353 (GPDR(i) & GPIO_bit(i))) {
354 if (GPLR(i) & GPIO_bit(i))
355 PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
357 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
361 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
363 saved_gafr[0][i] = GAFR_L(i);
364 saved_gafr[1][i] = GAFR_U(i);
365 saved_gpdr[i] = GPDR(i * 32);
366 saved_pgsr[i] = PGSR(i);
368 GPDR(i * 32) = gpdr_lpm[i];
373 static void pxa2xx_mfp_resume(void)
377 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
378 GAFR_L(i) = saved_gafr[0][i];
379 GAFR_U(i) = saved_gafr[1][i];
380 GPDR(i * 32) = saved_gpdr[i];
381 PGSR(i) = saved_pgsr[i];
383 PSSR = PSSR_RDH | PSSR_PH;
386 #define pxa2xx_mfp_suspend NULL
387 #define pxa2xx_mfp_resume NULL
390 struct syscore_ops pxa2xx_mfp_syscore_ops = {
391 .suspend = pxa2xx_mfp_suspend,
392 .resume = pxa2xx_mfp_resume,
395 static int __init pxa2xx_mfp_init(void)
399 if (!cpu_is_pxa2xx())
408 /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
411 /* initialize gafr_run[], pgsr_lpm[] from existing values */
412 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
413 gpdr_lpm[i] = GPDR(i * 32);
417 postcore_initcall(pxa2xx_mfp_init);