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 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 21 | #include <mach/hardware.h> |
| 22 | #include <mach/pxa-regs.h> |
| 23 | #include <mach/pxa2xx-regs.h> |
| 24 | #include <mach/mfp-pxa2xx.h> |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 25 | |
| 26 | #include "generic.h" |
| 27 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 28 | #define gpio_to_bank(gpio) ((gpio) >> 5) |
| 29 | |
| 30 | #define PGSR(x) __REG2(0x40F00020, (x) << 2) |
| 31 | #define __GAFR(u, x) __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3) |
| 32 | #define GAFR_L(x) __GAFR(0, x) |
| 33 | #define GAFR_U(x) __GAFR(1, x) |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 34 | |
| 35 | #define PWER_WE35 (1 << 24) |
| 36 | |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 37 | struct gpio_desc { |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 38 | unsigned valid : 1; |
| 39 | unsigned can_wakeup : 1; |
| 40 | unsigned keypad_gpio : 1; |
| 41 | unsigned int mask; /* bit mask in PWER or PKWR */ |
| 42 | unsigned long config; |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 43 | }; |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 44 | |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 45 | static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1]; |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 46 | static int gpio_nr; |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 47 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 48 | static unsigned long gpdr_lpm[4]; |
Eric Miao | 566b450 | 2008-06-16 09:47:47 +0800 | [diff] [blame] | 49 | |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 50 | static int __mfp_config_gpio(unsigned gpio, unsigned long c) |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 51 | { |
| 52 | unsigned long gafr, mask = GPIO_bit(gpio); |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 53 | int bank = gpio_to_bank(gpio); |
| 54 | int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */ |
| 55 | int shft = (gpio & 0xf) << 1; |
| 56 | int fn = MFP_AF(c); |
| 57 | int dir = c & MFP_DIR_OUT; |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 58 | |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 59 | if (fn > 3) |
| 60 | return -EINVAL; |
| 61 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 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); |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 65 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 66 | if (uorl == 0) |
| 67 | GAFR_L(bank) = gafr; |
| 68 | else |
| 69 | GAFR_U(bank) = gafr; |
| 70 | |
| 71 | if (dir == MFP_DIR_OUT) |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 72 | GPDR(gpio) |= mask; |
| 73 | else |
| 74 | GPDR(gpio) &= ~mask; |
| 75 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 76 | /* alternate function and direction at low power mode */ |
| 77 | switch (c & MFP_LPM_STATE_MASK) { |
| 78 | case MFP_LPM_DRIVE_HIGH: |
| 79 | PGSR(bank) |= mask; |
| 80 | dir = MFP_DIR_OUT; |
| 81 | break; |
| 82 | case MFP_LPM_DRIVE_LOW: |
| 83 | PGSR(bank) &= ~mask; |
| 84 | dir = MFP_DIR_OUT; |
| 85 | break; |
| 86 | case MFP_LPM_DEFAULT: |
| 87 | break; |
| 88 | default: |
| 89 | /* warning and fall through, treat as MFP_LPM_DEFAULT */ |
| 90 | pr_warning("%s: GPIO%d: unsupported low power mode\n", |
| 91 | __func__, gpio); |
| 92 | break; |
| 93 | } |
| 94 | |
| 95 | if (dir == MFP_DIR_OUT) |
| 96 | gpdr_lpm[bank] |= mask; |
| 97 | else |
| 98 | gpdr_lpm[bank] &= ~mask; |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 99 | |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 100 | /* give early warning if MFP_LPM_CAN_WAKEUP is set on the |
| 101 | * configurations of those pins not able to wakeup |
| 102 | */ |
| 103 | if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) { |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 104 | pr_warning("%s: GPIO%d unable to wakeup\n", |
| 105 | __func__, gpio); |
| 106 | return -EINVAL; |
| 107 | } |
| 108 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 109 | if ((c & MFP_LPM_CAN_WAKEUP) && (dir == MFP_DIR_OUT)) { |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 110 | pr_warning("%s: output GPIO%d unable to wakeup\n", |
| 111 | __func__, gpio); |
| 112 | return -EINVAL; |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 113 | } |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
Eric Miao | 0fedb0ca | 2008-06-16 09:38:27 +0800 | [diff] [blame] | 118 | static inline int __mfp_validate(int mfp) |
| 119 | { |
| 120 | int gpio = mfp_to_gpio(mfp); |
| 121 | |
| 122 | if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) { |
| 123 | pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio); |
| 124 | return -1; |
| 125 | } |
| 126 | |
| 127 | return gpio; |
| 128 | } |
| 129 | |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 130 | void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num) |
| 131 | { |
| 132 | unsigned long flags; |
| 133 | unsigned long *c; |
| 134 | int i, gpio; |
| 135 | |
| 136 | for (i = 0, c = mfp_cfgs; i < num; i++, c++) { |
| 137 | |
Eric Miao | 0fedb0ca | 2008-06-16 09:38:27 +0800 | [diff] [blame] | 138 | gpio = __mfp_validate(MFP_PIN(*c)); |
| 139 | if (gpio < 0) |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 140 | continue; |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 141 | |
| 142 | local_irq_save(flags); |
| 143 | |
| 144 | gpio_desc[gpio].config = *c; |
| 145 | __mfp_config_gpio(gpio, *c); |
| 146 | |
| 147 | local_irq_restore(flags); |
| 148 | } |
| 149 | } |
| 150 | |
Eric Miao | 566b450 | 2008-06-16 09:47:47 +0800 | [diff] [blame] | 151 | void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm) |
| 152 | { |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 153 | unsigned long flags, c; |
Eric Miao | 566b450 | 2008-06-16 09:47:47 +0800 | [diff] [blame] | 154 | int gpio; |
| 155 | |
| 156 | gpio = __mfp_validate(mfp); |
| 157 | if (gpio < 0) |
| 158 | return; |
| 159 | |
| 160 | local_irq_save(flags); |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 161 | |
| 162 | c = gpio_desc[gpio].config; |
| 163 | c = (c & ~MFP_LPM_STATE_MASK) | lpm; |
| 164 | __mfp_config_gpio(gpio, c); |
| 165 | |
Eric Miao | 566b450 | 2008-06-16 09:47:47 +0800 | [diff] [blame] | 166 | local_irq_restore(flags); |
| 167 | } |
| 168 | |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 169 | int gpio_set_wake(unsigned int gpio, unsigned int on) |
| 170 | { |
| 171 | struct gpio_desc *d; |
| 172 | unsigned long c; |
| 173 | |
| 174 | if (gpio > mfp_to_gpio(MFP_PIN_GPIO127)) |
| 175 | return -EINVAL; |
| 176 | |
| 177 | d = &gpio_desc[gpio]; |
| 178 | c = d->config; |
| 179 | |
| 180 | if (!d->valid) |
| 181 | return -EINVAL; |
| 182 | |
| 183 | if (d->keypad_gpio) |
| 184 | return -EINVAL; |
| 185 | |
| 186 | if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) { |
| 187 | if (on) { |
| 188 | PWER |= d->mask; |
| 189 | |
| 190 | if (c & MFP_LPM_EDGE_RISE) |
| 191 | PRER |= d->mask; |
| 192 | else |
| 193 | PRER &= ~d->mask; |
| 194 | |
| 195 | if (c & MFP_LPM_EDGE_FALL) |
| 196 | PFER |= d->mask; |
| 197 | else |
| 198 | PFER &= ~d->mask; |
| 199 | } else { |
| 200 | PWER &= ~d->mask; |
| 201 | PRER &= ~d->mask; |
| 202 | PFER &= ~d->mask; |
| 203 | } |
| 204 | } |
| 205 | return 0; |
| 206 | } |
| 207 | |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 208 | #ifdef CONFIG_PXA25x |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 209 | static void __init pxa25x_mfp_init(void) |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 210 | { |
| 211 | int i; |
| 212 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 213 | for (i = 0; i <= 84; i++) |
| 214 | gpio_desc[i].valid = 1; |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 215 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 216 | for (i = 0; i <= 15; i++) { |
| 217 | gpio_desc[i].can_wakeup = 1; |
| 218 | gpio_desc[i].mask = GPIO_bit(i); |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 219 | } |
| 220 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 221 | gpio_nr = 85; |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 222 | } |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 223 | #else |
| 224 | static inline void pxa25x_mfp_init(void) {} |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 225 | #endif /* CONFIG_PXA25x */ |
| 226 | |
| 227 | #ifdef CONFIG_PXA27x |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 228 | static int pxa27x_pkwr_gpio[] = { |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 229 | 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94, |
| 230 | 95, 96, 97, 98, 99, 100, 101, 102 |
| 231 | }; |
| 232 | |
eric miao | c0a596d | 2008-03-11 09:46:28 +0800 | [diff] [blame] | 233 | int keypad_set_wake(unsigned int on) |
| 234 | { |
| 235 | unsigned int i, gpio, mask = 0; |
| 236 | |
| 237 | if (!on) { |
| 238 | PKWR = 0; |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { |
| 243 | |
| 244 | gpio = pxa27x_pkwr_gpio[i]; |
| 245 | |
| 246 | if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP) |
| 247 | mask |= gpio_desc[gpio].mask; |
| 248 | } |
| 249 | |
| 250 | PKWR = mask; |
| 251 | return 0; |
| 252 | } |
| 253 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 254 | static void __init pxa27x_mfp_init(void) |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 255 | { |
| 256 | int i, gpio; |
| 257 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 258 | for (i = 0; i <= 120; i++) { |
| 259 | /* skip GPIO2, 5, 6, 7, 8, they are not |
| 260 | * valid pins allow configuration |
| 261 | */ |
| 262 | if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8) |
| 263 | continue; |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 264 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 265 | gpio_desc[i].valid = 1; |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 266 | } |
| 267 | |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 268 | /* Keypad GPIOs */ |
| 269 | for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { |
| 270 | gpio = pxa27x_pkwr_gpio[i]; |
| 271 | gpio_desc[gpio].can_wakeup = 1; |
| 272 | gpio_desc[gpio].keypad_gpio = 1; |
| 273 | gpio_desc[gpio].mask = 1 << i; |
| 274 | } |
| 275 | |
| 276 | /* Overwrite GPIO13 as a PWER wakeup source */ |
| 277 | for (i = 0; i <= 15; i++) { |
| 278 | /* skip GPIO2, 5, 6, 7, 8 */ |
| 279 | if (GPIO_bit(i) & 0x1e4) |
| 280 | continue; |
| 281 | |
| 282 | gpio_desc[i].can_wakeup = 1; |
| 283 | gpio_desc[i].mask = GPIO_bit(i); |
| 284 | } |
| 285 | |
| 286 | gpio_desc[35].can_wakeup = 1; |
| 287 | gpio_desc[35].mask = PWER_WE35; |
| 288 | |
| 289 | gpio_nr = 121; |
| 290 | } |
| 291 | #else |
| 292 | static inline void pxa27x_mfp_init(void) {} |
| 293 | #endif /* CONFIG_PXA27x */ |
| 294 | |
| 295 | #ifdef CONFIG_PM |
| 296 | static unsigned long saved_gafr[2][4]; |
| 297 | static unsigned long saved_gpdr[4]; |
| 298 | |
| 299 | static int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state) |
| 300 | { |
| 301 | int i; |
| 302 | |
| 303 | for (i = 0; i <= gpio_to_bank(gpio_nr); i++) { |
| 304 | |
| 305 | saved_gafr[0][i] = GAFR_L(i); |
| 306 | saved_gafr[1][i] = GAFR_U(i); |
| 307 | saved_gpdr[i] = GPDR(i * 32); |
| 308 | |
| 309 | GPDR(i * 32) = gpdr_lpm[i]; |
| 310 | } |
eric miao | 7facc2f9 | 2008-03-05 17:16:29 +0800 | [diff] [blame] | 311 | return 0; |
| 312 | } |
Eric Miao | 5a3d965 | 2008-09-03 18:06:34 +0800 | [diff] [blame] | 313 | |
| 314 | static int pxa2xx_mfp_resume(struct sys_device *d) |
| 315 | { |
| 316 | int i; |
| 317 | |
| 318 | for (i = 0; i <= gpio_to_bank(gpio_nr); i++) { |
| 319 | GAFR_L(i) = saved_gafr[0][i]; |
| 320 | GAFR_U(i) = saved_gafr[1][i]; |
| 321 | GPDR(i * 32) = saved_gpdr[i]; |
| 322 | } |
| 323 | PSSR = PSSR_RDH | PSSR_PH; |
| 324 | return 0; |
| 325 | } |
| 326 | #else |
| 327 | #define pxa2xx_mfp_suspend NULL |
| 328 | #define pxa2xx_mfp_resume NULL |
| 329 | #endif |
| 330 | |
| 331 | struct sysdev_class pxa2xx_mfp_sysclass = { |
| 332 | .name = "mfp", |
| 333 | .suspend = pxa2xx_mfp_suspend, |
| 334 | .resume = pxa2xx_mfp_resume, |
| 335 | }; |
| 336 | |
| 337 | static int __init pxa2xx_mfp_init(void) |
| 338 | { |
| 339 | int i; |
| 340 | |
| 341 | if (cpu_is_pxa25x()) |
| 342 | pxa25x_mfp_init(); |
| 343 | |
| 344 | if (cpu_is_pxa27x()) |
| 345 | pxa27x_mfp_init(); |
| 346 | |
| 347 | /* initialize gafr_run[], pgsr_lpm[] from existing values */ |
| 348 | for (i = 0; i <= gpio_to_bank(gpio_nr); i++) |
| 349 | gpdr_lpm[i] = GPDR(i * 32); |
| 350 | |
| 351 | return sysdev_class_register(&pxa2xx_mfp_sysclass); |
| 352 | } |
| 353 | postcore_initcall(pxa2xx_mfp_init); |