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 gpio_to_bank(gpio) ((gpio) >> 5)
29 #define PGSR(x) __REG2(0x40F00020, (x) << 2)
30 #define __GAFR(u, x) __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
31 #define GAFR_L(x) __GAFR(0, x)
32 #define GAFR_U(x) __GAFR(1, x)
34 #define PWER_WE35 (1 << 24)
38 unsigned can_wakeup : 1;
39 unsigned keypad_gpio : 1;
40 unsigned dir_inverted : 1;
41 unsigned int mask; /* bit mask in PWER or PKWR */
42 unsigned int mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
46 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
48 static unsigned long gpdr_lpm[4];
50 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
52 unsigned long gafr, mask = GPIO_bit(gpio);
53 int bank = gpio_to_bank(gpio);
54 int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
55 int shft = (gpio & 0xf) << 1;
57 int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
62 /* alternate function and direction at run-time */
63 gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
64 gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
71 if (is_out ^ gpio_desc[gpio].dir_inverted)
76 /* alternate function and direction at low power mode */
77 switch (c & MFP_LPM_STATE_MASK) {
78 case MFP_LPM_DRIVE_HIGH:
82 case MFP_LPM_DRIVE_LOW:
89 /* warning and fall through, treat as MFP_LPM_DEFAULT */
90 pr_warning("%s: GPIO%d: unsupported low power mode\n",
95 if (is_out ^ gpio_desc[gpio].dir_inverted)
96 gpdr_lpm[bank] |= mask;
98 gpdr_lpm[bank] &= ~mask;
100 /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
101 * configurations of those pins not able to wakeup
103 if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
104 pr_warning("%s: GPIO%d unable to wakeup\n",
109 if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
110 pr_warning("%s: output GPIO%d unable to wakeup\n",
118 static inline int __mfp_validate(int mfp)
120 int gpio = mfp_to_gpio(mfp);
122 if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
123 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
130 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
136 for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
138 gpio = __mfp_validate(MFP_PIN(*c));
142 local_irq_save(flags);
144 gpio_desc[gpio].config = *c;
145 __mfp_config_gpio(gpio, *c);
147 local_irq_restore(flags);
151 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
153 unsigned long flags, c;
156 gpio = __mfp_validate(mfp);
160 local_irq_save(flags);
162 c = gpio_desc[gpio].config;
163 c = (c & ~MFP_LPM_STATE_MASK) | lpm;
164 __mfp_config_gpio(gpio, c);
166 local_irq_restore(flags);
169 int gpio_set_wake(unsigned int gpio, unsigned int on)
172 unsigned long c, mux_taken;
174 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
177 d = &gpio_desc[gpio];
186 mux_taken = (PWER & d->mux_mask) & (~d->mask);
190 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
192 PWER = (PWER & ~d->mux_mask) | d->mask;
194 if (c & MFP_LPM_EDGE_RISE)
199 if (c & MFP_LPM_EDGE_FALL)
213 static void __init pxa25x_mfp_init(void)
217 for (i = 0; i <= pxa_last_gpio; i++)
218 gpio_desc[i].valid = 1;
220 for (i = 0; i <= 15; i++) {
221 gpio_desc[i].can_wakeup = 1;
222 gpio_desc[i].mask = GPIO_bit(i);
225 /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
226 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
228 for (i = 86; i <= pxa_last_gpio; i++)
229 gpio_desc[i].dir_inverted = 1;
232 static inline void pxa25x_mfp_init(void) {}
233 #endif /* CONFIG_PXA25x */
236 static int pxa27x_pkwr_gpio[] = {
237 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
238 95, 96, 97, 98, 99, 100, 101, 102
241 int keypad_set_wake(unsigned int on)
243 unsigned int i, gpio, mask = 0;
250 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
252 gpio = pxa27x_pkwr_gpio[i];
254 if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP)
255 mask |= gpio_desc[gpio].mask;
262 #define PWER_WEMUX2_GPIO38 (1 << 16)
263 #define PWER_WEMUX2_GPIO53 (2 << 16)
264 #define PWER_WEMUX2_GPIO40 (3 << 16)
265 #define PWER_WEMUX2_GPIO36 (4 << 16)
266 #define PWER_WEMUX2_MASK (7 << 16)
267 #define PWER_WEMUX3_GPIO31 (1 << 19)
268 #define PWER_WEMUX3_GPIO113 (2 << 19)
269 #define PWER_WEMUX3_MASK (3 << 19)
271 #define INIT_GPIO_DESC_MUXED(mux, gpio) \
273 gpio_desc[(gpio)].can_wakeup = 1; \
274 gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \
275 gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \
278 static void __init pxa27x_mfp_init(void)
282 for (i = 0; i <= pxa_last_gpio; i++) {
283 /* skip GPIO2, 5, 6, 7, 8, they are not
284 * valid pins allow configuration
286 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
289 gpio_desc[i].valid = 1;
293 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
294 gpio = pxa27x_pkwr_gpio[i];
295 gpio_desc[gpio].can_wakeup = 1;
296 gpio_desc[gpio].keypad_gpio = 1;
297 gpio_desc[gpio].mask = 1 << i;
300 /* Overwrite GPIO13 as a PWER wakeup source */
301 for (i = 0; i <= 15; i++) {
302 /* skip GPIO2, 5, 6, 7, 8 */
303 if (GPIO_bit(i) & 0x1e4)
306 gpio_desc[i].can_wakeup = 1;
307 gpio_desc[i].mask = GPIO_bit(i);
310 gpio_desc[35].can_wakeup = 1;
311 gpio_desc[35].mask = PWER_WE35;
313 INIT_GPIO_DESC_MUXED(WEMUX3, 31);
314 INIT_GPIO_DESC_MUXED(WEMUX3, 113);
315 INIT_GPIO_DESC_MUXED(WEMUX2, 38);
316 INIT_GPIO_DESC_MUXED(WEMUX2, 53);
317 INIT_GPIO_DESC_MUXED(WEMUX2, 40);
318 INIT_GPIO_DESC_MUXED(WEMUX2, 36);
321 static inline void pxa27x_mfp_init(void) {}
322 #endif /* CONFIG_PXA27x */
325 static unsigned long saved_gafr[2][4];
326 static unsigned long saved_gpdr[4];
328 static int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state)
332 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
334 saved_gafr[0][i] = GAFR_L(i);
335 saved_gafr[1][i] = GAFR_U(i);
336 saved_gpdr[i] = GPDR(i * 32);
338 GPDR(i * 32) = gpdr_lpm[i];
343 static int pxa2xx_mfp_resume(struct sys_device *d)
347 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
348 GAFR_L(i) = saved_gafr[0][i];
349 GAFR_U(i) = saved_gafr[1][i];
350 GPDR(i * 32) = saved_gpdr[i];
352 PSSR = PSSR_RDH | PSSR_PH;
356 #define pxa2xx_mfp_suspend NULL
357 #define pxa2xx_mfp_resume NULL
360 struct sysdev_class pxa2xx_mfp_sysclass = {
362 .suspend = pxa2xx_mfp_suspend,
363 .resume = pxa2xx_mfp_resume,
366 static int __init pxa2xx_mfp_init(void)
370 if (!cpu_is_pxa2xx())
379 /* initialize gafr_run[], pgsr_lpm[] from existing values */
380 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
381 gpdr_lpm[i] = GPDR(i * 32);
383 return sysdev_class_register(&pxa2xx_mfp_sysclass);
385 postcore_initcall(pxa2xx_mfp_init);