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.
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/sysdev.h>
21 #include <mach/gpio.h>
22 #include <mach/pxa2xx-regs.h>
23 #include <mach/mfp-pxa2xx.h>
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)
32 #define PWER_WE35 (1 << 24)
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 */
44 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
46 static unsigned long gpdr_lpm[4];
48 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
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;
55 int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
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);
69 if (is_out ^ gpio_desc[gpio].dir_inverted)
74 /* alternate function and direction at low power mode */
75 switch (c & MFP_LPM_STATE_MASK) {
76 case MFP_LPM_DRIVE_HIGH:
80 case MFP_LPM_DRIVE_LOW:
88 /* warning and fall through, treat as MFP_LPM_DEFAULT */
89 pr_warning("%s: GPIO%d: unsupported low power mode\n",
94 if (is_out ^ gpio_desc[gpio].dir_inverted)
95 gpdr_lpm[bank] |= mask;
97 gpdr_lpm[bank] &= ~mask;
99 /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
100 * configurations of those pins not able to wakeup
102 if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
103 pr_warning("%s: GPIO%d unable to wakeup\n",
108 if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
109 pr_warning("%s: output GPIO%d unable to wakeup\n",
117 static inline int __mfp_validate(int mfp)
119 int gpio = mfp_to_gpio(mfp);
121 if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
122 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
129 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
135 for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
137 gpio = __mfp_validate(MFP_PIN(*c));
141 local_irq_save(flags);
143 gpio_desc[gpio].config = *c;
144 __mfp_config_gpio(gpio, *c);
146 local_irq_restore(flags);
150 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
152 unsigned long flags, c;
155 gpio = __mfp_validate(mfp);
159 local_irq_save(flags);
161 c = gpio_desc[gpio].config;
162 c = (c & ~MFP_LPM_STATE_MASK) | lpm;
163 __mfp_config_gpio(gpio, c);
165 local_irq_restore(flags);
168 int gpio_set_wake(unsigned int gpio, unsigned int on)
171 unsigned long c, mux_taken;
173 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
176 d = &gpio_desc[gpio];
182 /* Allow keypad GPIOs to wakeup system when
183 * configured as generic GPIOs.
185 if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
186 (d->config & MFP_LPM_CAN_WAKEUP)) {
194 mux_taken = (PWER & d->mux_mask) & (~d->mask);
198 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
200 PWER = (PWER & ~d->mux_mask) | d->mask;
202 if (c & MFP_LPM_EDGE_RISE)
207 if (c & MFP_LPM_EDGE_FALL)
221 static void __init pxa25x_mfp_init(void)
225 for (i = 0; i <= pxa_last_gpio; i++)
226 gpio_desc[i].valid = 1;
228 for (i = 0; i <= 15; i++) {
229 gpio_desc[i].can_wakeup = 1;
230 gpio_desc[i].mask = GPIO_bit(i);
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.
236 for (i = 86; i <= pxa_last_gpio; i++)
237 gpio_desc[i].dir_inverted = 1;
240 static inline void pxa25x_mfp_init(void) {}
241 #endif /* CONFIG_PXA25x */
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
249 int keypad_set_wake(unsigned int on)
251 unsigned int i, gpio, mask = 0;
254 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
256 gpio = pxa27x_pkwr_gpio[i];
257 d = &gpio_desc[gpio];
259 /* skip if configured as generic GPIO */
260 if (MFP_AF(d->config) == 0)
263 if (d->config & MFP_LPM_CAN_WAKEUP)
264 mask |= gpio_desc[gpio].mask;
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)
283 #define INIT_GPIO_DESC_MUXED(mux, gpio) \
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; \
290 static void __init pxa27x_mfp_init(void)
294 for (i = 0; i <= pxa_last_gpio; i++) {
295 /* skip GPIO2, 5, 6, 7, 8, they are not
296 * valid pins allow configuration
298 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
301 gpio_desc[i].valid = 1;
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;
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)
318 gpio_desc[i].can_wakeup = 1;
319 gpio_desc[i].mask = GPIO_bit(i);
322 gpio_desc[35].can_wakeup = 1;
323 gpio_desc[35].mask = PWER_WE35;
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);
333 static inline void pxa27x_mfp_init(void) {}
334 #endif /* CONFIG_PXA27x */
337 static unsigned long saved_gafr[2][4];
338 static unsigned long saved_gpdr[4];
339 static unsigned long saved_pgsr[4];
341 static int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state)
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);
352 PGSR(i) &= ~GPIO_bit(i);
356 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
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);
363 GPDR(i * 32) = gpdr_lpm[i];
368 static int pxa2xx_mfp_resume(struct sys_device *d)
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];
378 PSSR = PSSR_RDH | PSSR_PH;
382 #define pxa2xx_mfp_suspend NULL
383 #define pxa2xx_mfp_resume NULL
386 struct sysdev_class pxa2xx_mfp_sysclass = {
388 .suspend = pxa2xx_mfp_suspend,
389 .resume = pxa2xx_mfp_resume,
392 static int __init pxa2xx_mfp_init(void)
396 if (!cpu_is_pxa2xx())
405 /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
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);
412 return sysdev_class_register(&pxa2xx_mfp_sysclass);
414 postcore_initcall(pxa2xx_mfp_init);