eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 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> |
Russell King | 0b0a9df | 2008-05-18 14:59:36 +0100 | [diff] [blame^] | 23 | #include <asm/arch/pxa2xx-regs.h> |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 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 | |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 32 | struct gpio_desc { |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 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; |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 38 | }; |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 39 | |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 40 | static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1]; |
| 41 | |
| 42 | static int __mfp_config_gpio(unsigned gpio, unsigned long c) |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 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 | |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 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) { |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 80 | pr_warning("%s: GPIO%d unable to wakeup\n", |
| 81 | __func__, gpio); |
| 82 | return -EINVAL; |
| 83 | } |
| 84 | |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 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; |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 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 | |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 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 | |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 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 |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 179 | static int pxa27x_pkwr_gpio[] = { |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 180 | 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94, |
| 181 | 95, 96, 97, 98, 99, 100, 101, 102 |
| 182 | }; |
| 183 | |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 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 | |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 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 */ |