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1 | /* |
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> |
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23 | #include <asm/arch/pxa2xx-regs.h> |
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24 | #include <asm/arch/mfp-pxa2xx.h> |
25 | |
26 | #include "generic.h" |
27 | |
28 | #define PGSR(x) __REG2(0x40F00020, ((x) & 0x60) >> 3) |
29 | |
30 | #define PWER_WE35 (1 << 24) |
31 | |
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32 | struct gpio_desc { |
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33 | unsigned valid : 1; |
34 | unsigned can_wakeup : 1; |
35 | unsigned keypad_gpio : 1; |
36 | unsigned int mask; /* bit mask in PWER or PKWR */ |
37 | unsigned long config; |
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38 | }; |
39 | |
40 | static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1]; |
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41 | |
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42 | static int __mfp_config_gpio(unsigned gpio, unsigned long c) |
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43 | { |
44 | unsigned long gafr, mask = GPIO_bit(gpio); |
45 | int fn; |
46 | |
47 | fn = MFP_AF(c); |
48 | if (fn > 3) |
49 | return -EINVAL; |
50 | |
51 | /* alternate function and direction */ |
52 | gafr = GAFR(gpio) & ~(0x3 << ((gpio & 0xf) * 2)); |
53 | GAFR(gpio) = gafr | (fn << ((gpio & 0xf) * 2)); |
54 | |
55 | if (c & MFP_DIR_OUT) |
56 | GPDR(gpio) |= mask; |
57 | else |
58 | GPDR(gpio) &= ~mask; |
59 | |
60 | /* low power state */ |
61 | switch (c & MFP_LPM_STATE_MASK) { |
62 | case MFP_LPM_DRIVE_HIGH: |
63 | PGSR(gpio) |= mask; |
64 | break; |
65 | case MFP_LPM_DRIVE_LOW: |
66 | PGSR(gpio) &= ~mask; |
67 | break; |
68 | case MFP_LPM_INPUT: |
69 | break; |
70 | default: |
71 | pr_warning("%s: invalid low power state for GPIO%d\n", |
72 | __func__, gpio); |
73 | return -EINVAL; |
74 | } |
75 | |
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76 | /* give early warning if MFP_LPM_CAN_WAKEUP is set on the |
77 | * configurations of those pins not able to wakeup |
78 | */ |
79 | if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) { |
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80 | pr_warning("%s: GPIO%d unable to wakeup\n", |
81 | __func__, gpio); |
82 | return -EINVAL; |
83 | } |
84 | |
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85 | if ((c & MFP_LPM_CAN_WAKEUP) && (c & MFP_DIR_OUT)) { |
86 | pr_warning("%s: output GPIO%d unable to wakeup\n", |
87 | __func__, gpio); |
88 | return -EINVAL; |
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89 | } |
90 | |
91 | return 0; |
92 | } |
93 | |
94 | void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num) |
95 | { |
96 | unsigned long flags; |
97 | unsigned long *c; |
98 | int i, gpio; |
99 | |
100 | for (i = 0, c = mfp_cfgs; i < num; i++, c++) { |
101 | |
102 | gpio = mfp_to_gpio(MFP_PIN(*c)); |
103 | |
104 | if (!gpio_desc[gpio].valid) { |
105 | pr_warning("%s: GPIO%d is invalid pin\n", |
106 | __func__, gpio); |
107 | continue; |
108 | } |
109 | |
110 | local_irq_save(flags); |
111 | |
112 | gpio_desc[gpio].config = *c; |
113 | __mfp_config_gpio(gpio, *c); |
114 | |
115 | local_irq_restore(flags); |
116 | } |
117 | } |
118 | |
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119 | int gpio_set_wake(unsigned int gpio, unsigned int on) |
120 | { |
121 | struct gpio_desc *d; |
122 | unsigned long c; |
123 | |
124 | if (gpio > mfp_to_gpio(MFP_PIN_GPIO127)) |
125 | return -EINVAL; |
126 | |
127 | d = &gpio_desc[gpio]; |
128 | c = d->config; |
129 | |
130 | if (!d->valid) |
131 | return -EINVAL; |
132 | |
133 | if (d->keypad_gpio) |
134 | return -EINVAL; |
135 | |
136 | if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) { |
137 | if (on) { |
138 | PWER |= d->mask; |
139 | |
140 | if (c & MFP_LPM_EDGE_RISE) |
141 | PRER |= d->mask; |
142 | else |
143 | PRER &= ~d->mask; |
144 | |
145 | if (c & MFP_LPM_EDGE_FALL) |
146 | PFER |= d->mask; |
147 | else |
148 | PFER &= ~d->mask; |
149 | } else { |
150 | PWER &= ~d->mask; |
151 | PRER &= ~d->mask; |
152 | PFER &= ~d->mask; |
153 | } |
154 | } |
155 | return 0; |
156 | } |
157 | |
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158 | #ifdef CONFIG_PXA25x |
159 | static int __init pxa25x_mfp_init(void) |
160 | { |
161 | int i; |
162 | |
163 | if (cpu_is_pxa25x()) { |
164 | for (i = 0; i <= 84; i++) |
165 | gpio_desc[i].valid = 1; |
166 | |
167 | for (i = 0; i <= 15; i++) { |
168 | gpio_desc[i].can_wakeup = 1; |
169 | gpio_desc[i].mask = GPIO_bit(i); |
170 | } |
171 | } |
172 | |
173 | return 0; |
174 | } |
175 | postcore_initcall(pxa25x_mfp_init); |
176 | #endif /* CONFIG_PXA25x */ |
177 | |
178 | #ifdef CONFIG_PXA27x |
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179 | static int pxa27x_pkwr_gpio[] = { |
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180 | 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94, |
181 | 95, 96, 97, 98, 99, 100, 101, 102 |
182 | }; |
183 | |
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184 | int keypad_set_wake(unsigned int on) |
185 | { |
186 | unsigned int i, gpio, mask = 0; |
187 | |
188 | if (!on) { |
189 | PKWR = 0; |
190 | return 0; |
191 | } |
192 | |
193 | for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { |
194 | |
195 | gpio = pxa27x_pkwr_gpio[i]; |
196 | |
197 | if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP) |
198 | mask |= gpio_desc[gpio].mask; |
199 | } |
200 | |
201 | PKWR = mask; |
202 | return 0; |
203 | } |
204 | |
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205 | static int __init pxa27x_mfp_init(void) |
206 | { |
207 | int i, gpio; |
208 | |
209 | if (cpu_is_pxa27x()) { |
210 | for (i = 0; i <= 120; i++) { |
211 | /* skip GPIO2, 5, 6, 7, 8, they are not |
212 | * valid pins allow configuration |
213 | */ |
214 | if (i == 2 || i == 5 || i == 6 || |
215 | i == 7 || i == 8) |
216 | continue; |
217 | |
218 | gpio_desc[i].valid = 1; |
219 | } |
220 | |
221 | /* Keypad GPIOs */ |
222 | for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { |
223 | gpio = pxa27x_pkwr_gpio[i]; |
224 | gpio_desc[gpio].can_wakeup = 1; |
225 | gpio_desc[gpio].keypad_gpio = 1; |
226 | gpio_desc[gpio].mask = 1 << i; |
227 | } |
228 | |
229 | /* Overwrite GPIO13 as a PWER wakeup source */ |
230 | for (i = 0; i <= 15; i++) { |
231 | /* skip GPIO2, 5, 6, 7, 8 */ |
232 | if (GPIO_bit(i) & 0x1e4) |
233 | continue; |
234 | |
235 | gpio_desc[i].can_wakeup = 1; |
236 | gpio_desc[i].mask = GPIO_bit(i); |
237 | } |
238 | |
239 | gpio_desc[35].can_wakeup = 1; |
240 | gpio_desc[35].mask = PWER_WE35; |
241 | } |
242 | |
243 | return 0; |
244 | } |
245 | postcore_initcall(pxa27x_mfp_init); |
246 | #endif /* CONFIG_PXA27x */ |