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>
20 #include <linux/syscore_ops.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 BANK_OFF(n) (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
33 #define GPLR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5))
34 #define GPDR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c)
36 #define PWER_WE35 (1 << 24)
40 unsigned can_wakeup : 1;
41 unsigned keypad_gpio : 1;
42 unsigned dir_inverted : 1;
43 unsigned int mask; /* bit mask in PWER or PKWR */
44 unsigned int mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
48 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
50 static unsigned long gpdr_lpm[4];
52 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
54 unsigned long gafr, mask = GPIO_bit(gpio);
55 int bank = gpio_to_bank(gpio);
56 int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
57 int shft = (gpio & 0xf) << 1;
59 int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
64 /* alternate function and direction at run-time */
65 gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
66 gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
73 if (is_out ^ gpio_desc[gpio].dir_inverted)
78 /* alternate function and direction at low power mode */
79 switch (c & MFP_LPM_STATE_MASK) {
80 case MFP_LPM_DRIVE_HIGH:
84 case MFP_LPM_DRIVE_LOW:
92 /* warning and fall through, treat as MFP_LPM_DEFAULT */
93 pr_warning("%s: GPIO%d: unsupported low power mode\n",
98 if (is_out ^ gpio_desc[gpio].dir_inverted)
99 gpdr_lpm[bank] |= mask;
101 gpdr_lpm[bank] &= ~mask;
103 /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
104 * configurations of those pins not able to wakeup
106 if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
107 pr_warning("%s: GPIO%d unable to wakeup\n",
112 if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
113 pr_warning("%s: output GPIO%d unable to wakeup\n",
121 static inline int __mfp_validate(int mfp)
123 int gpio = mfp_to_gpio(mfp);
125 if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
126 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
133 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
139 for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
141 gpio = __mfp_validate(MFP_PIN(*c));
145 local_irq_save(flags);
147 gpio_desc[gpio].config = *c;
148 __mfp_config_gpio(gpio, *c);
150 local_irq_restore(flags);
154 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
156 unsigned long flags, c;
159 gpio = __mfp_validate(mfp);
163 local_irq_save(flags);
165 c = gpio_desc[gpio].config;
166 c = (c & ~MFP_LPM_STATE_MASK) | lpm;
167 __mfp_config_gpio(gpio, c);
169 local_irq_restore(flags);
172 int gpio_set_wake(unsigned int gpio, unsigned int on)
175 unsigned long c, mux_taken;
177 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
180 d = &gpio_desc[gpio];
186 /* Allow keypad GPIOs to wakeup system when
187 * configured as generic GPIOs.
189 if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
190 (d->config & MFP_LPM_CAN_WAKEUP)) {
198 mux_taken = (PWER & d->mux_mask) & (~d->mask);
202 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
204 PWER = (PWER & ~d->mux_mask) | d->mask;
206 if (c & MFP_LPM_EDGE_RISE)
211 if (c & MFP_LPM_EDGE_FALL)
225 static void __init pxa25x_mfp_init(void)
229 /* running before pxa_gpio_probe() */
230 #ifdef CONFIG_CPU_PXA26x
235 for (i = 0; i <= pxa_last_gpio; i++)
236 gpio_desc[i].valid = 1;
238 for (i = 0; i <= 15; i++) {
239 gpio_desc[i].can_wakeup = 1;
240 gpio_desc[i].mask = GPIO_bit(i);
243 /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
244 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
246 for (i = 86; i <= pxa_last_gpio; i++)
247 gpio_desc[i].dir_inverted = 1;
250 static inline void pxa25x_mfp_init(void) {}
251 #endif /* CONFIG_PXA25x */
254 static int pxa27x_pkwr_gpio[] = {
255 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
256 95, 96, 97, 98, 99, 100, 101, 102
259 int keypad_set_wake(unsigned int on)
261 unsigned int i, gpio, mask = 0;
264 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
266 gpio = pxa27x_pkwr_gpio[i];
267 d = &gpio_desc[gpio];
269 /* skip if configured as generic GPIO */
270 if (MFP_AF(d->config) == 0)
273 if (d->config & MFP_LPM_CAN_WAKEUP)
274 mask |= gpio_desc[gpio].mask;
284 #define PWER_WEMUX2_GPIO38 (1 << 16)
285 #define PWER_WEMUX2_GPIO53 (2 << 16)
286 #define PWER_WEMUX2_GPIO40 (3 << 16)
287 #define PWER_WEMUX2_GPIO36 (4 << 16)
288 #define PWER_WEMUX2_MASK (7 << 16)
289 #define PWER_WEMUX3_GPIO31 (1 << 19)
290 #define PWER_WEMUX3_GPIO113 (2 << 19)
291 #define PWER_WEMUX3_MASK (3 << 19)
293 #define INIT_GPIO_DESC_MUXED(mux, gpio) \
295 gpio_desc[(gpio)].can_wakeup = 1; \
296 gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \
297 gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \
300 static void __init pxa27x_mfp_init(void)
304 pxa_last_gpio = 120; /* running before pxa_gpio_probe() */
305 for (i = 0; i <= pxa_last_gpio; i++) {
306 /* skip GPIO2, 5, 6, 7, 8, they are not
307 * valid pins allow configuration
309 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
312 gpio_desc[i].valid = 1;
316 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
317 gpio = pxa27x_pkwr_gpio[i];
318 gpio_desc[gpio].can_wakeup = 1;
319 gpio_desc[gpio].keypad_gpio = 1;
320 gpio_desc[gpio].mask = 1 << i;
323 /* Overwrite GPIO13 as a PWER wakeup source */
324 for (i = 0; i <= 15; i++) {
325 /* skip GPIO2, 5, 6, 7, 8 */
326 if (GPIO_bit(i) & 0x1e4)
329 gpio_desc[i].can_wakeup = 1;
330 gpio_desc[i].mask = GPIO_bit(i);
333 gpio_desc[35].can_wakeup = 1;
334 gpio_desc[35].mask = PWER_WE35;
336 INIT_GPIO_DESC_MUXED(WEMUX3, 31);
337 INIT_GPIO_DESC_MUXED(WEMUX3, 113);
338 INIT_GPIO_DESC_MUXED(WEMUX2, 38);
339 INIT_GPIO_DESC_MUXED(WEMUX2, 53);
340 INIT_GPIO_DESC_MUXED(WEMUX2, 40);
341 INIT_GPIO_DESC_MUXED(WEMUX2, 36);
344 static inline void pxa27x_mfp_init(void) {}
345 #endif /* CONFIG_PXA27x */
348 static unsigned long saved_gafr[2][4];
349 static unsigned long saved_gpdr[4];
350 static unsigned long saved_pgsr[4];
352 static int pxa2xx_mfp_suspend(void)
356 /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
357 for (i = 0; i < pxa_last_gpio; i++) {
358 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
359 (GPDR(i) & GPIO_bit(i))) {
360 if (GPLR(i) & GPIO_bit(i))
361 PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
363 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
367 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
369 saved_gafr[0][i] = GAFR_L(i);
370 saved_gafr[1][i] = GAFR_U(i);
371 saved_gpdr[i] = GPDR(i * 32);
372 saved_pgsr[i] = PGSR(i);
374 GPDR(i * 32) = gpdr_lpm[i];
379 static void pxa2xx_mfp_resume(void)
383 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
384 GAFR_L(i) = saved_gafr[0][i];
385 GAFR_U(i) = saved_gafr[1][i];
386 GPDR(i * 32) = saved_gpdr[i];
387 PGSR(i) = saved_pgsr[i];
389 PSSR = PSSR_RDH | PSSR_PH;
392 #define pxa2xx_mfp_suspend NULL
393 #define pxa2xx_mfp_resume NULL
396 struct syscore_ops pxa2xx_mfp_syscore_ops = {
397 .suspend = pxa2xx_mfp_suspend,
398 .resume = pxa2xx_mfp_resume,
401 static int __init pxa2xx_mfp_init(void)
405 if (!cpu_is_pxa2xx())
414 /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
417 /* initialize gafr_run[], pgsr_lpm[] from existing values */
418 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
419 gpdr_lpm[i] = GPDR(i * 32);
423 postcore_initcall(pxa2xx_mfp_init);