blob: 22097a1707cc0287ed416a69d8c5b93f41a60d85 [file] [log] [blame]
eric miao7facc2f92008-03-05 17:16:29 +08001/*
2 * linux/arch/arm/mach-pxa/mfp-pxa2xx.c
3 *
4 * PXA2xx pin mux configuration support
5 *
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.
10 *
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.
14 */
15
16#include <linux/module.h>
17#include <linux/kernel.h>
18#include <linux/init.h>
19#include <linux/sysdev.h>
20
21#include <asm/arch/hardware.h>
22#include <asm/arch/pxa-regs.h>
23#include <asm/arch/mfp-pxa2xx.h>
24
25#include "generic.h"
26
27#define PGSR(x) __REG2(0x40F00020, ((x) & 0x60) >> 3)
28
29#define PWER_WE35 (1 << 24)
30
eric miaoc0a596d2008-03-11 09:46:28 +080031struct gpio_desc {
eric miao7facc2f92008-03-05 17:16:29 +080032 unsigned valid : 1;
33 unsigned can_wakeup : 1;
34 unsigned keypad_gpio : 1;
35 unsigned int mask; /* bit mask in PWER or PKWR */
36 unsigned long config;
eric miaoc0a596d2008-03-11 09:46:28 +080037};
eric miao7facc2f92008-03-05 17:16:29 +080038
eric miaoc0a596d2008-03-11 09:46:28 +080039static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
40
41static int __mfp_config_gpio(unsigned gpio, unsigned long c)
eric miao7facc2f92008-03-05 17:16:29 +080042{
43 unsigned long gafr, mask = GPIO_bit(gpio);
44 int fn;
45
46 fn = MFP_AF(c);
47 if (fn > 3)
48 return -EINVAL;
49
50 /* alternate function and direction */
51 gafr = GAFR(gpio) & ~(0x3 << ((gpio & 0xf) * 2));
52 GAFR(gpio) = gafr | (fn << ((gpio & 0xf) * 2));
53
54 if (c & MFP_DIR_OUT)
55 GPDR(gpio) |= mask;
56 else
57 GPDR(gpio) &= ~mask;
58
59 /* low power state */
60 switch (c & MFP_LPM_STATE_MASK) {
61 case MFP_LPM_DRIVE_HIGH:
62 PGSR(gpio) |= mask;
63 break;
64 case MFP_LPM_DRIVE_LOW:
65 PGSR(gpio) &= ~mask;
66 break;
67 case MFP_LPM_INPUT:
68 break;
69 default:
70 pr_warning("%s: invalid low power state for GPIO%d\n",
71 __func__, gpio);
72 return -EINVAL;
73 }
74
eric miaoc0a596d2008-03-11 09:46:28 +080075 /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
76 * configurations of those pins not able to wakeup
77 */
78 if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
eric miao7facc2f92008-03-05 17:16:29 +080079 pr_warning("%s: GPIO%d unable to wakeup\n",
80 __func__, gpio);
81 return -EINVAL;
82 }
83
eric miaoc0a596d2008-03-11 09:46:28 +080084 if ((c & MFP_LPM_CAN_WAKEUP) && (c & MFP_DIR_OUT)) {
85 pr_warning("%s: output GPIO%d unable to wakeup\n",
86 __func__, gpio);
87 return -EINVAL;
eric miao7facc2f92008-03-05 17:16:29 +080088 }
89
90 return 0;
91}
92
93void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
94{
95 unsigned long flags;
96 unsigned long *c;
97 int i, gpio;
98
99 for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
100
101 gpio = mfp_to_gpio(MFP_PIN(*c));
102
103 if (!gpio_desc[gpio].valid) {
104 pr_warning("%s: GPIO%d is invalid pin\n",
105 __func__, gpio);
106 continue;
107 }
108
109 local_irq_save(flags);
110
111 gpio_desc[gpio].config = *c;
112 __mfp_config_gpio(gpio, *c);
113
114 local_irq_restore(flags);
115 }
116}
117
eric miaoc0a596d2008-03-11 09:46:28 +0800118int gpio_set_wake(unsigned int gpio, unsigned int on)
119{
120 struct gpio_desc *d;
121 unsigned long c;
122
123 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
124 return -EINVAL;
125
126 d = &gpio_desc[gpio];
127 c = d->config;
128
129 if (!d->valid)
130 return -EINVAL;
131
132 if (d->keypad_gpio)
133 return -EINVAL;
134
135 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
136 if (on) {
137 PWER |= d->mask;
138
139 if (c & MFP_LPM_EDGE_RISE)
140 PRER |= d->mask;
141 else
142 PRER &= ~d->mask;
143
144 if (c & MFP_LPM_EDGE_FALL)
145 PFER |= d->mask;
146 else
147 PFER &= ~d->mask;
148 } else {
149 PWER &= ~d->mask;
150 PRER &= ~d->mask;
151 PFER &= ~d->mask;
152 }
153 }
154 return 0;
155}
156
eric miao7facc2f92008-03-05 17:16:29 +0800157#ifdef CONFIG_PXA25x
158static int __init pxa25x_mfp_init(void)
159{
160 int i;
161
162 if (cpu_is_pxa25x()) {
163 for (i = 0; i <= 84; i++)
164 gpio_desc[i].valid = 1;
165
166 for (i = 0; i <= 15; i++) {
167 gpio_desc[i].can_wakeup = 1;
168 gpio_desc[i].mask = GPIO_bit(i);
169 }
170 }
171
172 return 0;
173}
174postcore_initcall(pxa25x_mfp_init);
175#endif /* CONFIG_PXA25x */
176
177#ifdef CONFIG_PXA27x
eric miaoc0a596d2008-03-11 09:46:28 +0800178static int pxa27x_pkwr_gpio[] = {
eric miao7facc2f92008-03-05 17:16:29 +0800179 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
180 95, 96, 97, 98, 99, 100, 101, 102
181};
182
eric miaoc0a596d2008-03-11 09:46:28 +0800183int keypad_set_wake(unsigned int on)
184{
185 unsigned int i, gpio, mask = 0;
186
187 if (!on) {
188 PKWR = 0;
189 return 0;
190 }
191
192 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
193
194 gpio = pxa27x_pkwr_gpio[i];
195
196 if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP)
197 mask |= gpio_desc[gpio].mask;
198 }
199
200 PKWR = mask;
201 return 0;
202}
203
eric miao7facc2f92008-03-05 17:16:29 +0800204static int __init pxa27x_mfp_init(void)
205{
206 int i, gpio;
207
208 if (cpu_is_pxa27x()) {
209 for (i = 0; i <= 120; i++) {
210 /* skip GPIO2, 5, 6, 7, 8, they are not
211 * valid pins allow configuration
212 */
213 if (i == 2 || i == 5 || i == 6 ||
214 i == 7 || i == 8)
215 continue;
216
217 gpio_desc[i].valid = 1;
218 }
219
220 /* Keypad GPIOs */
221 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
222 gpio = pxa27x_pkwr_gpio[i];
223 gpio_desc[gpio].can_wakeup = 1;
224 gpio_desc[gpio].keypad_gpio = 1;
225 gpio_desc[gpio].mask = 1 << i;
226 }
227
228 /* Overwrite GPIO13 as a PWER wakeup source */
229 for (i = 0; i <= 15; i++) {
230 /* skip GPIO2, 5, 6, 7, 8 */
231 if (GPIO_bit(i) & 0x1e4)
232 continue;
233
234 gpio_desc[i].can_wakeup = 1;
235 gpio_desc[i].mask = GPIO_bit(i);
236 }
237
238 gpio_desc[35].can_wakeup = 1;
239 gpio_desc[35].mask = PWER_WE35;
240 }
241
242 return 0;
243}
244postcore_initcall(pxa27x_mfp_init);
245#endif /* CONFIG_PXA27x */