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/hardware.h>
22 #include <mach/pxa-regs.h>
23 #include <mach/pxa2xx-regs.h>
24 #include <mach/mfp-pxa2xx.h>
28 #define PGSR(x) __REG2(0x40F00020, ((x) & 0x60) >> 3)
30 #define PWER_WE35 (1 << 24)
34 unsigned can_wakeup : 1;
35 unsigned keypad_gpio : 1;
36 unsigned int mask; /* bit mask in PWER or PKWR */
40 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
42 static int __mfp_config_lpm(unsigned gpio, unsigned long lpm)
44 unsigned mask = GPIO_bit(gpio);
48 case MFP_LPM_DRIVE_HIGH:
51 case MFP_LPM_DRIVE_LOW:
57 pr_warning("%s: invalid low power state for GPIO%d\n",
64 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
66 unsigned long gafr, mask = GPIO_bit(gpio);
73 /* alternate function and direction */
74 gafr = GAFR(gpio) & ~(0x3 << ((gpio & 0xf) * 2));
75 GAFR(gpio) = gafr | (fn << ((gpio & 0xf) * 2));
82 if (__mfp_config_lpm(gpio, c & MFP_LPM_STATE_MASK))
85 /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
86 * configurations of those pins not able to wakeup
88 if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
89 pr_warning("%s: GPIO%d unable to wakeup\n",
94 if ((c & MFP_LPM_CAN_WAKEUP) && (c & MFP_DIR_OUT)) {
95 pr_warning("%s: output GPIO%d unable to wakeup\n",
103 static inline int __mfp_validate(int mfp)
105 int gpio = mfp_to_gpio(mfp);
107 if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
108 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
115 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
121 for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
123 gpio = __mfp_validate(MFP_PIN(*c));
127 local_irq_save(flags);
129 gpio_desc[gpio].config = *c;
130 __mfp_config_gpio(gpio, *c);
132 local_irq_restore(flags);
136 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
141 gpio = __mfp_validate(mfp);
145 local_irq_save(flags);
146 __mfp_config_lpm(gpio, lpm);
147 local_irq_restore(flags);
150 int gpio_set_wake(unsigned int gpio, unsigned int on)
155 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
158 d = &gpio_desc[gpio];
167 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
171 if (c & MFP_LPM_EDGE_RISE)
176 if (c & MFP_LPM_EDGE_FALL)
190 static int __init pxa25x_mfp_init(void)
194 if (cpu_is_pxa25x()) {
195 for (i = 0; i <= 84; i++)
196 gpio_desc[i].valid = 1;
198 for (i = 0; i <= 15; i++) {
199 gpio_desc[i].can_wakeup = 1;
200 gpio_desc[i].mask = GPIO_bit(i);
206 postcore_initcall(pxa25x_mfp_init);
207 #endif /* CONFIG_PXA25x */
210 static int pxa27x_pkwr_gpio[] = {
211 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
212 95, 96, 97, 98, 99, 100, 101, 102
215 int keypad_set_wake(unsigned int on)
217 unsigned int i, gpio, mask = 0;
224 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
226 gpio = pxa27x_pkwr_gpio[i];
228 if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP)
229 mask |= gpio_desc[gpio].mask;
236 static int __init pxa27x_mfp_init(void)
240 if (cpu_is_pxa27x()) {
241 for (i = 0; i <= 120; i++) {
242 /* skip GPIO2, 5, 6, 7, 8, they are not
243 * valid pins allow configuration
245 if (i == 2 || i == 5 || i == 6 ||
249 gpio_desc[i].valid = 1;
253 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
254 gpio = pxa27x_pkwr_gpio[i];
255 gpio_desc[gpio].can_wakeup = 1;
256 gpio_desc[gpio].keypad_gpio = 1;
257 gpio_desc[gpio].mask = 1 << i;
260 /* Overwrite GPIO13 as a PWER wakeup source */
261 for (i = 0; i <= 15; i++) {
262 /* skip GPIO2, 5, 6, 7, 8 */
263 if (GPIO_bit(i) & 0x1e4)
266 gpio_desc[i].can_wakeup = 1;
267 gpio_desc[i].mask = GPIO_bit(i);
270 gpio_desc[35].can_wakeup = 1;
271 gpio_desc[35].mask = PWER_WE35;
276 postcore_initcall(pxa27x_mfp_init);
277 #endif /* CONFIG_PXA27x */