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/io.h> 21 #include <linux/syscore_ops.h> 22 23 #include <mach/pxa2xx-regs.h> 24 #include <mach/mfp-pxa2xx.h> 25 26 #include "generic.h" 27 28 #define PGSR(x) __REG2(0x40F00020, (x) << 2) 29 #define __GAFR(u, x) __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3) 30 #define GAFR_L(x) __GAFR(0, x) 31 #define GAFR_U(x) __GAFR(1, x) 32 33 #define BANK_OFF(n) (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2)) 34 #define GPLR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5)) 35 #define GPDR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c) 36 #define GPSR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x18) 37 #define GPCR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x24) 38 39 #define PWER_WE35 (1 << 24) 40 41 struct gpio_desc { 42 unsigned valid : 1; 43 unsigned can_wakeup : 1; 44 unsigned keypad_gpio : 1; 45 unsigned dir_inverted : 1; 46 unsigned int mask; /* bit mask in PWER or PKWR */ 47 unsigned int mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */ 48 unsigned long config; 49 }; 50 51 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1]; 52 53 static unsigned long gpdr_lpm[4]; 54 55 static int __mfp_config_gpio(unsigned gpio, unsigned long c) 56 { 57 unsigned long gafr, mask = GPIO_bit(gpio); 58 int bank = gpio_to_bank(gpio); 59 int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */ 60 int shft = (gpio & 0xf) << 1; 61 int fn = MFP_AF(c); 62 int is_out = (c & MFP_DIR_OUT) ? 1 : 0; 63 64 if (fn > 3) 65 return -EINVAL; 66 67 /* alternate function and direction at run-time */ 68 gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank); 69 gafr = (gafr & ~(0x3 << shft)) | (fn << shft); 70 71 if (uorl == 0) 72 GAFR_L(bank) = gafr; 73 else 74 GAFR_U(bank) = gafr; 75 76 if (is_out ^ gpio_desc[gpio].dir_inverted) 77 GPDR(gpio) |= mask; 78 else 79 GPDR(gpio) &= ~mask; 80 81 /* alternate function and direction at low power mode */ 82 switch (c & MFP_LPM_STATE_MASK) { 83 case MFP_LPM_DRIVE_HIGH: 84 PGSR(bank) |= mask; 85 is_out = 1; 86 break; 87 case MFP_LPM_DRIVE_LOW: 88 PGSR(bank) &= ~mask; 89 is_out = 1; 90 break; 91 case MFP_LPM_INPUT: 92 case MFP_LPM_DEFAULT: 93 break; 94 default: 95 /* warning and fall through, treat as MFP_LPM_DEFAULT */ 96 pr_warning("%s: GPIO%d: unsupported low power mode\n", 97 __func__, gpio); 98 break; 99 } 100 101 if (is_out ^ gpio_desc[gpio].dir_inverted) 102 gpdr_lpm[bank] |= mask; 103 else 104 gpdr_lpm[bank] &= ~mask; 105 106 /* give early warning if MFP_LPM_CAN_WAKEUP is set on the 107 * configurations of those pins not able to wakeup 108 */ 109 if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) { 110 pr_warning("%s: GPIO%d unable to wakeup\n", 111 __func__, gpio); 112 return -EINVAL; 113 } 114 115 if ((c & MFP_LPM_CAN_WAKEUP) && is_out) { 116 pr_warning("%s: output GPIO%d unable to wakeup\n", 117 __func__, gpio); 118 return -EINVAL; 119 } 120 121 return 0; 122 } 123 124 static inline int __mfp_validate(int mfp) 125 { 126 int gpio = mfp_to_gpio(mfp); 127 128 if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) { 129 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio); 130 return -1; 131 } 132 133 return gpio; 134 } 135 136 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num) 137 { 138 unsigned long flags; 139 unsigned long *c; 140 int i, gpio; 141 142 for (i = 0, c = mfp_cfgs; i < num; i++, c++) { 143 144 gpio = __mfp_validate(MFP_PIN(*c)); 145 if (gpio < 0) 146 continue; 147 148 local_irq_save(flags); 149 150 gpio_desc[gpio].config = *c; 151 __mfp_config_gpio(gpio, *c); 152 153 local_irq_restore(flags); 154 } 155 } 156 157 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm) 158 { 159 unsigned long flags, c; 160 int gpio; 161 162 gpio = __mfp_validate(mfp); 163 if (gpio < 0) 164 return; 165 166 local_irq_save(flags); 167 168 c = gpio_desc[gpio].config; 169 c = (c & ~MFP_LPM_STATE_MASK) | lpm; 170 __mfp_config_gpio(gpio, c); 171 172 local_irq_restore(flags); 173 } 174 175 int gpio_set_wake(unsigned int gpio, unsigned int on) 176 { 177 struct gpio_desc *d; 178 unsigned long c, mux_taken; 179 180 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127)) 181 return -EINVAL; 182 183 d = &gpio_desc[gpio]; 184 c = d->config; 185 186 if (!d->valid) 187 return -EINVAL; 188 189 /* Allow keypad GPIOs to wakeup system when 190 * configured as generic GPIOs. 191 */ 192 if (d->keypad_gpio && (MFP_AF(d->config) == 0) && 193 (d->config & MFP_LPM_CAN_WAKEUP)) { 194 if (on) 195 PKWR |= d->mask; 196 else 197 PKWR &= ~d->mask; 198 return 0; 199 } 200 201 mux_taken = (PWER & d->mux_mask) & (~d->mask); 202 if (on && mux_taken) 203 return -EBUSY; 204 205 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) { 206 if (on) { 207 PWER = (PWER & ~d->mux_mask) | d->mask; 208 209 if (c & MFP_LPM_EDGE_RISE) 210 PRER |= d->mask; 211 else 212 PRER &= ~d->mask; 213 214 if (c & MFP_LPM_EDGE_FALL) 215 PFER |= d->mask; 216 else 217 PFER &= ~d->mask; 218 } else { 219 PWER &= ~d->mask; 220 PRER &= ~d->mask; 221 PFER &= ~d->mask; 222 } 223 } 224 return 0; 225 } 226 227 #ifdef CONFIG_PXA25x 228 static void __init pxa25x_mfp_init(void) 229 { 230 int i; 231 232 /* running before pxa_gpio_probe() */ 233 #ifdef CONFIG_CPU_PXA26x 234 pxa_last_gpio = 89; 235 #else 236 pxa_last_gpio = 84; 237 #endif 238 for (i = 0; i <= pxa_last_gpio; i++) 239 gpio_desc[i].valid = 1; 240 241 for (i = 0; i <= 15; i++) { 242 gpio_desc[i].can_wakeup = 1; 243 gpio_desc[i].mask = GPIO_bit(i); 244 } 245 246 /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the 247 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1. 248 */ 249 for (i = 86; i <= pxa_last_gpio; i++) 250 gpio_desc[i].dir_inverted = 1; 251 } 252 #else 253 static inline void pxa25x_mfp_init(void) {} 254 #endif /* CONFIG_PXA25x */ 255 256 #ifdef CONFIG_PXA27x 257 static int pxa27x_pkwr_gpio[] = { 258 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94, 259 95, 96, 97, 98, 99, 100, 101, 102 260 }; 261 262 int keypad_set_wake(unsigned int on) 263 { 264 unsigned int i, gpio, mask = 0; 265 struct gpio_desc *d; 266 267 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { 268 269 gpio = pxa27x_pkwr_gpio[i]; 270 d = &gpio_desc[gpio]; 271 272 /* skip if configured as generic GPIO */ 273 if (MFP_AF(d->config) == 0) 274 continue; 275 276 if (d->config & MFP_LPM_CAN_WAKEUP) 277 mask |= gpio_desc[gpio].mask; 278 } 279 280 if (on) 281 PKWR |= mask; 282 else 283 PKWR &= ~mask; 284 return 0; 285 } 286 287 #define PWER_WEMUX2_GPIO38 (1 << 16) 288 #define PWER_WEMUX2_GPIO53 (2 << 16) 289 #define PWER_WEMUX2_GPIO40 (3 << 16) 290 #define PWER_WEMUX2_GPIO36 (4 << 16) 291 #define PWER_WEMUX2_MASK (7 << 16) 292 #define PWER_WEMUX3_GPIO31 (1 << 19) 293 #define PWER_WEMUX3_GPIO113 (2 << 19) 294 #define PWER_WEMUX3_MASK (3 << 19) 295 296 #define INIT_GPIO_DESC_MUXED(mux, gpio) \ 297 do { \ 298 gpio_desc[(gpio)].can_wakeup = 1; \ 299 gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \ 300 gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \ 301 } while (0) 302 303 static void __init pxa27x_mfp_init(void) 304 { 305 int i, gpio; 306 307 pxa_last_gpio = 120; /* running before pxa_gpio_probe() */ 308 for (i = 0; i <= pxa_last_gpio; i++) { 309 /* skip GPIO2, 5, 6, 7, 8, they are not 310 * valid pins allow configuration 311 */ 312 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8) 313 continue; 314 315 gpio_desc[i].valid = 1; 316 } 317 318 /* Keypad GPIOs */ 319 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { 320 gpio = pxa27x_pkwr_gpio[i]; 321 gpio_desc[gpio].can_wakeup = 1; 322 gpio_desc[gpio].keypad_gpio = 1; 323 gpio_desc[gpio].mask = 1 << i; 324 } 325 326 /* Overwrite GPIO13 as a PWER wakeup source */ 327 for (i = 0; i <= 15; i++) { 328 /* skip GPIO2, 5, 6, 7, 8 */ 329 if (GPIO_bit(i) & 0x1e4) 330 continue; 331 332 gpio_desc[i].can_wakeup = 1; 333 gpio_desc[i].mask = GPIO_bit(i); 334 } 335 336 gpio_desc[35].can_wakeup = 1; 337 gpio_desc[35].mask = PWER_WE35; 338 339 INIT_GPIO_DESC_MUXED(WEMUX3, 31); 340 INIT_GPIO_DESC_MUXED(WEMUX3, 113); 341 INIT_GPIO_DESC_MUXED(WEMUX2, 38); 342 INIT_GPIO_DESC_MUXED(WEMUX2, 53); 343 INIT_GPIO_DESC_MUXED(WEMUX2, 40); 344 INIT_GPIO_DESC_MUXED(WEMUX2, 36); 345 } 346 #else 347 static inline void pxa27x_mfp_init(void) {} 348 #endif /* CONFIG_PXA27x */ 349 350 #ifdef CONFIG_PM 351 static unsigned long saved_gafr[2][4]; 352 static unsigned long saved_gpdr[4]; 353 static unsigned long saved_gplr[4]; 354 static unsigned long saved_pgsr[4]; 355 356 static int pxa2xx_mfp_suspend(void) 357 { 358 int i; 359 360 /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */ 361 for (i = 0; i < pxa_last_gpio; i++) { 362 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) && 363 (GPDR(i) & GPIO_bit(i))) { 364 if (GPLR(i) & GPIO_bit(i)) 365 PGSR(gpio_to_bank(i)) |= GPIO_bit(i); 366 else 367 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i); 368 } 369 } 370 371 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { 372 saved_gafr[0][i] = GAFR_L(i); 373 saved_gafr[1][i] = GAFR_U(i); 374 saved_gpdr[i] = GPDR(i * 32); 375 saved_gplr[i] = GPLR(i * 32); 376 saved_pgsr[i] = PGSR(i); 377 378 GPSR(i * 32) = PGSR(i); 379 GPCR(i * 32) = ~PGSR(i); 380 } 381 382 /* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */ 383 for (i = 0; i < pxa_last_gpio; i++) { 384 if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) || 385 ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) && 386 (saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i)))) 387 GPDR(i) |= GPIO_bit(i); 388 else 389 GPDR(i) &= ~GPIO_bit(i); 390 } 391 392 return 0; 393 } 394 395 static void pxa2xx_mfp_resume(void) 396 { 397 int i; 398 399 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { 400 GAFR_L(i) = saved_gafr[0][i]; 401 GAFR_U(i) = saved_gafr[1][i]; 402 GPSR(i * 32) = saved_gplr[i]; 403 GPCR(i * 32) = ~saved_gplr[i]; 404 GPDR(i * 32) = saved_gpdr[i]; 405 PGSR(i) = saved_pgsr[i]; 406 } 407 PSSR = PSSR_RDH | PSSR_PH; 408 } 409 #else 410 #define pxa2xx_mfp_suspend NULL 411 #define pxa2xx_mfp_resume NULL 412 #endif 413 414 struct syscore_ops pxa2xx_mfp_syscore_ops = { 415 .suspend = pxa2xx_mfp_suspend, 416 .resume = pxa2xx_mfp_resume, 417 }; 418 419 static int __init pxa2xx_mfp_init(void) 420 { 421 int i; 422 423 if (!cpu_is_pxa2xx()) 424 return 0; 425 426 if (cpu_is_pxa25x()) 427 pxa25x_mfp_init(); 428 429 if (cpu_is_pxa27x()) 430 pxa27x_mfp_init(); 431 432 /* clear RDH bit to enable GPIO receivers after reset/sleep exit */ 433 PSSR = PSSR_RDH; 434 435 /* initialize gafr_run[], pgsr_lpm[] from existing values */ 436 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) 437 gpdr_lpm[i] = GPDR(i * 32); 438 439 return 0; 440 } 441 postcore_initcall(pxa2xx_mfp_init); 442