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 #include <linux/gpio.h> 16 #include <linux/gpio-pxa.h> 17 #include <linux/module.h> 18 #include <linux/kernel.h> 19 #include <linux/init.h> 20 #include <linux/syscore_ops.h> 21 22 #include <mach/pxa2xx-regs.h> 23 #include <mach/mfp-pxa2xx.h> 24 25 #include "generic.h" 26 27 #define PGSR(x) __REG2(0x40F00020, (x) << 2) 28 #define __GAFR(u, x) __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3) 29 #define GAFR_L(x) __GAFR(0, x) 30 #define GAFR_U(x) __GAFR(1, x) 31 32 #define BANK_OFF(n) (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2)) 33 #define GPLR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5)) 34 #define GPDR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c) 35 36 #define PWER_WE35 (1 << 24) 37 38 struct gpio_desc { 39 unsigned valid : 1; 40 unsigned can_wakeup : 1; 41 unsigned keypad_gpio : 1; 42 unsigned dir_inverted : 1; 43 unsigned int mask; /* bit mask in PWER or PKWR */ 44 unsigned int mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */ 45 unsigned long config; 46 }; 47 48 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1]; 49 50 static unsigned long gpdr_lpm[4]; 51 52 static int __mfp_config_gpio(unsigned gpio, unsigned long c) 53 { 54 unsigned long gafr, mask = GPIO_bit(gpio); 55 int bank = gpio_to_bank(gpio); 56 int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */ 57 int shft = (gpio & 0xf) << 1; 58 int fn = MFP_AF(c); 59 int is_out = (c & MFP_DIR_OUT) ? 1 : 0; 60 61 if (fn > 3) 62 return -EINVAL; 63 64 /* alternate function and direction at run-time */ 65 gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank); 66 gafr = (gafr & ~(0x3 << shft)) | (fn << shft); 67 68 if (uorl == 0) 69 GAFR_L(bank) = gafr; 70 else 71 GAFR_U(bank) = gafr; 72 73 if (is_out ^ gpio_desc[gpio].dir_inverted) 74 GPDR(gpio) |= mask; 75 else 76 GPDR(gpio) &= ~mask; 77 78 /* alternate function and direction at low power mode */ 79 switch (c & MFP_LPM_STATE_MASK) { 80 case MFP_LPM_DRIVE_HIGH: 81 PGSR(bank) |= mask; 82 is_out = 1; 83 break; 84 case MFP_LPM_DRIVE_LOW: 85 PGSR(bank) &= ~mask; 86 is_out = 1; 87 break; 88 case MFP_LPM_INPUT: 89 case MFP_LPM_DEFAULT: 90 break; 91 default: 92 /* warning and fall through, treat as MFP_LPM_DEFAULT */ 93 pr_warning("%s: GPIO%d: unsupported low power mode\n", 94 __func__, gpio); 95 break; 96 } 97 98 if (is_out ^ gpio_desc[gpio].dir_inverted) 99 gpdr_lpm[bank] |= mask; 100 else 101 gpdr_lpm[bank] &= ~mask; 102 103 /* give early warning if MFP_LPM_CAN_WAKEUP is set on the 104 * configurations of those pins not able to wakeup 105 */ 106 if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) { 107 pr_warning("%s: GPIO%d unable to wakeup\n", 108 __func__, gpio); 109 return -EINVAL; 110 } 111 112 if ((c & MFP_LPM_CAN_WAKEUP) && is_out) { 113 pr_warning("%s: output GPIO%d unable to wakeup\n", 114 __func__, gpio); 115 return -EINVAL; 116 } 117 118 return 0; 119 } 120 121 static inline int __mfp_validate(int mfp) 122 { 123 int gpio = mfp_to_gpio(mfp); 124 125 if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) { 126 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio); 127 return -1; 128 } 129 130 return gpio; 131 } 132 133 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num) 134 { 135 unsigned long flags; 136 unsigned long *c; 137 int i, gpio; 138 139 for (i = 0, c = mfp_cfgs; i < num; i++, c++) { 140 141 gpio = __mfp_validate(MFP_PIN(*c)); 142 if (gpio < 0) 143 continue; 144 145 local_irq_save(flags); 146 147 gpio_desc[gpio].config = *c; 148 __mfp_config_gpio(gpio, *c); 149 150 local_irq_restore(flags); 151 } 152 } 153 154 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm) 155 { 156 unsigned long flags, c; 157 int gpio; 158 159 gpio = __mfp_validate(mfp); 160 if (gpio < 0) 161 return; 162 163 local_irq_save(flags); 164 165 c = gpio_desc[gpio].config; 166 c = (c & ~MFP_LPM_STATE_MASK) | lpm; 167 __mfp_config_gpio(gpio, c); 168 169 local_irq_restore(flags); 170 } 171 172 int gpio_set_wake(unsigned int gpio, unsigned int on) 173 { 174 struct gpio_desc *d; 175 unsigned long c, mux_taken; 176 177 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127)) 178 return -EINVAL; 179 180 d = &gpio_desc[gpio]; 181 c = d->config; 182 183 if (!d->valid) 184 return -EINVAL; 185 186 /* Allow keypad GPIOs to wakeup system when 187 * configured as generic GPIOs. 188 */ 189 if (d->keypad_gpio && (MFP_AF(d->config) == 0) && 190 (d->config & MFP_LPM_CAN_WAKEUP)) { 191 if (on) 192 PKWR |= d->mask; 193 else 194 PKWR &= ~d->mask; 195 return 0; 196 } 197 198 mux_taken = (PWER & d->mux_mask) & (~d->mask); 199 if (on && mux_taken) 200 return -EBUSY; 201 202 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) { 203 if (on) { 204 PWER = (PWER & ~d->mux_mask) | d->mask; 205 206 if (c & MFP_LPM_EDGE_RISE) 207 PRER |= d->mask; 208 else 209 PRER &= ~d->mask; 210 211 if (c & MFP_LPM_EDGE_FALL) 212 PFER |= d->mask; 213 else 214 PFER &= ~d->mask; 215 } else { 216 PWER &= ~d->mask; 217 PRER &= ~d->mask; 218 PFER &= ~d->mask; 219 } 220 } 221 return 0; 222 } 223 224 #ifdef CONFIG_PXA25x 225 static void __init pxa25x_mfp_init(void) 226 { 227 int i; 228 229 /* running before pxa_gpio_probe() */ 230 #ifdef CONFIG_CPU_PXA26x 231 pxa_last_gpio = 89; 232 #else 233 pxa_last_gpio = 84; 234 #endif 235 for (i = 0; i <= pxa_last_gpio; i++) 236 gpio_desc[i].valid = 1; 237 238 for (i = 0; i <= 15; i++) { 239 gpio_desc[i].can_wakeup = 1; 240 gpio_desc[i].mask = GPIO_bit(i); 241 } 242 243 /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the 244 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1. 245 */ 246 for (i = 86; i <= pxa_last_gpio; i++) 247 gpio_desc[i].dir_inverted = 1; 248 } 249 #else 250 static inline void pxa25x_mfp_init(void) {} 251 #endif /* CONFIG_PXA25x */ 252 253 #ifdef CONFIG_PXA27x 254 static int pxa27x_pkwr_gpio[] = { 255 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94, 256 95, 96, 97, 98, 99, 100, 101, 102 257 }; 258 259 int keypad_set_wake(unsigned int on) 260 { 261 unsigned int i, gpio, mask = 0; 262 struct gpio_desc *d; 263 264 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { 265 266 gpio = pxa27x_pkwr_gpio[i]; 267 d = &gpio_desc[gpio]; 268 269 /* skip if configured as generic GPIO */ 270 if (MFP_AF(d->config) == 0) 271 continue; 272 273 if (d->config & MFP_LPM_CAN_WAKEUP) 274 mask |= gpio_desc[gpio].mask; 275 } 276 277 if (on) 278 PKWR |= mask; 279 else 280 PKWR &= ~mask; 281 return 0; 282 } 283 284 #define PWER_WEMUX2_GPIO38 (1 << 16) 285 #define PWER_WEMUX2_GPIO53 (2 << 16) 286 #define PWER_WEMUX2_GPIO40 (3 << 16) 287 #define PWER_WEMUX2_GPIO36 (4 << 16) 288 #define PWER_WEMUX2_MASK (7 << 16) 289 #define PWER_WEMUX3_GPIO31 (1 << 19) 290 #define PWER_WEMUX3_GPIO113 (2 << 19) 291 #define PWER_WEMUX3_MASK (3 << 19) 292 293 #define INIT_GPIO_DESC_MUXED(mux, gpio) \ 294 do { \ 295 gpio_desc[(gpio)].can_wakeup = 1; \ 296 gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \ 297 gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \ 298 } while (0) 299 300 static void __init pxa27x_mfp_init(void) 301 { 302 int i, gpio; 303 304 pxa_last_gpio = 120; /* running before pxa_gpio_probe() */ 305 for (i = 0; i <= pxa_last_gpio; i++) { 306 /* skip GPIO2, 5, 6, 7, 8, they are not 307 * valid pins allow configuration 308 */ 309 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8) 310 continue; 311 312 gpio_desc[i].valid = 1; 313 } 314 315 /* Keypad GPIOs */ 316 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { 317 gpio = pxa27x_pkwr_gpio[i]; 318 gpio_desc[gpio].can_wakeup = 1; 319 gpio_desc[gpio].keypad_gpio = 1; 320 gpio_desc[gpio].mask = 1 << i; 321 } 322 323 /* Overwrite GPIO13 as a PWER wakeup source */ 324 for (i = 0; i <= 15; i++) { 325 /* skip GPIO2, 5, 6, 7, 8 */ 326 if (GPIO_bit(i) & 0x1e4) 327 continue; 328 329 gpio_desc[i].can_wakeup = 1; 330 gpio_desc[i].mask = GPIO_bit(i); 331 } 332 333 gpio_desc[35].can_wakeup = 1; 334 gpio_desc[35].mask = PWER_WE35; 335 336 INIT_GPIO_DESC_MUXED(WEMUX3, 31); 337 INIT_GPIO_DESC_MUXED(WEMUX3, 113); 338 INIT_GPIO_DESC_MUXED(WEMUX2, 38); 339 INIT_GPIO_DESC_MUXED(WEMUX2, 53); 340 INIT_GPIO_DESC_MUXED(WEMUX2, 40); 341 INIT_GPIO_DESC_MUXED(WEMUX2, 36); 342 } 343 #else 344 static inline void pxa27x_mfp_init(void) {} 345 #endif /* CONFIG_PXA27x */ 346 347 #ifdef CONFIG_PM 348 static unsigned long saved_gafr[2][4]; 349 static unsigned long saved_gpdr[4]; 350 static unsigned long saved_pgsr[4]; 351 352 static int pxa2xx_mfp_suspend(void) 353 { 354 int i; 355 356 /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */ 357 for (i = 0; i < pxa_last_gpio; i++) { 358 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) && 359 (GPDR(i) & GPIO_bit(i))) { 360 if (GPLR(i) & GPIO_bit(i)) 361 PGSR(gpio_to_bank(i)) |= GPIO_bit(i); 362 else 363 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i); 364 } 365 } 366 367 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { 368 369 saved_gafr[0][i] = GAFR_L(i); 370 saved_gafr[1][i] = GAFR_U(i); 371 saved_gpdr[i] = GPDR(i * 32); 372 saved_pgsr[i] = PGSR(i); 373 374 GPDR(i * 32) = gpdr_lpm[i]; 375 } 376 return 0; 377 } 378 379 static void pxa2xx_mfp_resume(void) 380 { 381 int i; 382 383 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { 384 GAFR_L(i) = saved_gafr[0][i]; 385 GAFR_U(i) = saved_gafr[1][i]; 386 GPDR(i * 32) = saved_gpdr[i]; 387 PGSR(i) = saved_pgsr[i]; 388 } 389 PSSR = PSSR_RDH | PSSR_PH; 390 } 391 #else 392 #define pxa2xx_mfp_suspend NULL 393 #define pxa2xx_mfp_resume NULL 394 #endif 395 396 struct syscore_ops pxa2xx_mfp_syscore_ops = { 397 .suspend = pxa2xx_mfp_suspend, 398 .resume = pxa2xx_mfp_resume, 399 }; 400 401 static int __init pxa2xx_mfp_init(void) 402 { 403 int i; 404 405 if (!cpu_is_pxa2xx()) 406 return 0; 407 408 if (cpu_is_pxa25x()) 409 pxa25x_mfp_init(); 410 411 if (cpu_is_pxa27x()) 412 pxa27x_mfp_init(); 413 414 /* clear RDH bit to enable GPIO receivers after reset/sleep exit */ 415 PSSR = PSSR_RDH; 416 417 /* initialize gafr_run[], pgsr_lpm[] from existing values */ 418 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) 419 gpdr_lpm[i] = GPDR(i * 32); 420 421 return 0; 422 } 423 postcore_initcall(pxa2xx_mfp_init); 424