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 "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_warn("%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_warn("%s: GPIO%d unable to wakeup\n", __func__, gpio); 111 return -EINVAL; 112 } 113 114 if ((c & MFP_LPM_CAN_WAKEUP) && is_out) { 115 pr_warn("%s: output GPIO%d unable to wakeup\n", __func__, gpio); 116 return -EINVAL; 117 } 118 119 return 0; 120 } 121 122 static inline int __mfp_validate(int mfp) 123 { 124 int gpio = mfp_to_gpio(mfp); 125 126 if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) { 127 pr_warn("%s: GPIO%d is invalid pin\n", __func__, gpio); 128 return -1; 129 } 130 131 return gpio; 132 } 133 134 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num) 135 { 136 unsigned long flags; 137 unsigned long *c; 138 int i, gpio; 139 140 for (i = 0, c = mfp_cfgs; i < num; i++, c++) { 141 142 gpio = __mfp_validate(MFP_PIN(*c)); 143 if (gpio < 0) 144 continue; 145 146 local_irq_save(flags); 147 148 gpio_desc[gpio].config = *c; 149 __mfp_config_gpio(gpio, *c); 150 151 local_irq_restore(flags); 152 } 153 } 154 155 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm) 156 { 157 unsigned long flags, c; 158 int gpio; 159 160 gpio = __mfp_validate(mfp); 161 if (gpio < 0) 162 return; 163 164 local_irq_save(flags); 165 166 c = gpio_desc[gpio].config; 167 c = (c & ~MFP_LPM_STATE_MASK) | lpm; 168 __mfp_config_gpio(gpio, c); 169 170 local_irq_restore(flags); 171 } 172 173 int gpio_set_wake(unsigned int gpio, unsigned int on) 174 { 175 struct gpio_desc *d; 176 unsigned long c, mux_taken; 177 178 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127)) 179 return -EINVAL; 180 181 d = &gpio_desc[gpio]; 182 c = d->config; 183 184 if (!d->valid) 185 return -EINVAL; 186 187 /* Allow keypad GPIOs to wakeup system when 188 * configured as generic GPIOs. 189 */ 190 if (d->keypad_gpio && (MFP_AF(d->config) == 0) && 191 (d->config & MFP_LPM_CAN_WAKEUP)) { 192 if (on) 193 PKWR |= d->mask; 194 else 195 PKWR &= ~d->mask; 196 return 0; 197 } 198 199 mux_taken = (PWER & d->mux_mask) & (~d->mask); 200 if (on && mux_taken) 201 return -EBUSY; 202 203 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) { 204 if (on) { 205 PWER = (PWER & ~d->mux_mask) | d->mask; 206 207 if (c & MFP_LPM_EDGE_RISE) 208 PRER |= d->mask; 209 else 210 PRER &= ~d->mask; 211 212 if (c & MFP_LPM_EDGE_FALL) 213 PFER |= d->mask; 214 else 215 PFER &= ~d->mask; 216 } else { 217 PWER &= ~d->mask; 218 PRER &= ~d->mask; 219 PFER &= ~d->mask; 220 } 221 } 222 return 0; 223 } 224 225 #ifdef CONFIG_PXA25x 226 static void __init pxa25x_mfp_init(void) 227 { 228 int i; 229 230 /* running before pxa_gpio_probe() */ 231 #ifdef CONFIG_CPU_PXA26x 232 pxa_last_gpio = 89; 233 #else 234 pxa_last_gpio = 84; 235 #endif 236 for (i = 0; i <= pxa_last_gpio; i++) 237 gpio_desc[i].valid = 1; 238 239 for (i = 0; i <= 15; i++) { 240 gpio_desc[i].can_wakeup = 1; 241 gpio_desc[i].mask = GPIO_bit(i); 242 } 243 244 /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the 245 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1. 246 */ 247 for (i = 86; i <= pxa_last_gpio; i++) 248 gpio_desc[i].dir_inverted = 1; 249 } 250 #else 251 static inline void pxa25x_mfp_init(void) {} 252 #endif /* CONFIG_PXA25x */ 253 254 #ifdef CONFIG_PXA27x 255 static int pxa27x_pkwr_gpio[] = { 256 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94, 257 95, 96, 97, 98, 99, 100, 101, 102 258 }; 259 260 int keypad_set_wake(unsigned int on) 261 { 262 unsigned int i, gpio, mask = 0; 263 struct gpio_desc *d; 264 265 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { 266 267 gpio = pxa27x_pkwr_gpio[i]; 268 d = &gpio_desc[gpio]; 269 270 /* skip if configured as generic GPIO */ 271 if (MFP_AF(d->config) == 0) 272 continue; 273 274 if (d->config & MFP_LPM_CAN_WAKEUP) 275 mask |= gpio_desc[gpio].mask; 276 } 277 278 if (on) 279 PKWR |= mask; 280 else 281 PKWR &= ~mask; 282 return 0; 283 } 284 285 #define PWER_WEMUX2_GPIO38 (1 << 16) 286 #define PWER_WEMUX2_GPIO53 (2 << 16) 287 #define PWER_WEMUX2_GPIO40 (3 << 16) 288 #define PWER_WEMUX2_GPIO36 (4 << 16) 289 #define PWER_WEMUX2_MASK (7 << 16) 290 #define PWER_WEMUX3_GPIO31 (1 << 19) 291 #define PWER_WEMUX3_GPIO113 (2 << 19) 292 #define PWER_WEMUX3_MASK (3 << 19) 293 294 #define INIT_GPIO_DESC_MUXED(mux, gpio) \ 295 do { \ 296 gpio_desc[(gpio)].can_wakeup = 1; \ 297 gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \ 298 gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \ 299 } while (0) 300 301 static void __init pxa27x_mfp_init(void) 302 { 303 int i, gpio; 304 305 pxa_last_gpio = 120; /* running before pxa_gpio_probe() */ 306 for (i = 0; i <= pxa_last_gpio; i++) { 307 /* skip GPIO2, 5, 6, 7, 8, they are not 308 * valid pins allow configuration 309 */ 310 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8) 311 continue; 312 313 gpio_desc[i].valid = 1; 314 } 315 316 /* Keypad GPIOs */ 317 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { 318 gpio = pxa27x_pkwr_gpio[i]; 319 gpio_desc[gpio].can_wakeup = 1; 320 gpio_desc[gpio].keypad_gpio = 1; 321 gpio_desc[gpio].mask = 1 << i; 322 } 323 324 /* Overwrite GPIO13 as a PWER wakeup source */ 325 for (i = 0; i <= 15; i++) { 326 /* skip GPIO2, 5, 6, 7, 8 */ 327 if (GPIO_bit(i) & 0x1e4) 328 continue; 329 330 gpio_desc[i].can_wakeup = 1; 331 gpio_desc[i].mask = GPIO_bit(i); 332 } 333 334 gpio_desc[35].can_wakeup = 1; 335 gpio_desc[35].mask = PWER_WE35; 336 337 INIT_GPIO_DESC_MUXED(WEMUX3, 31); 338 INIT_GPIO_DESC_MUXED(WEMUX3, 113); 339 INIT_GPIO_DESC_MUXED(WEMUX2, 38); 340 INIT_GPIO_DESC_MUXED(WEMUX2, 53); 341 INIT_GPIO_DESC_MUXED(WEMUX2, 40); 342 INIT_GPIO_DESC_MUXED(WEMUX2, 36); 343 } 344 #else 345 static inline void pxa27x_mfp_init(void) {} 346 #endif /* CONFIG_PXA27x */ 347 348 #ifdef CONFIG_PM 349 static unsigned long saved_gafr[2][4]; 350 static unsigned long saved_gpdr[4]; 351 static unsigned long saved_gplr[4]; 352 static unsigned long saved_pgsr[4]; 353 354 static int pxa2xx_mfp_suspend(void) 355 { 356 int i; 357 358 /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */ 359 for (i = 0; i < pxa_last_gpio; i++) { 360 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) && 361 (GPDR(i) & GPIO_bit(i))) { 362 if (GPLR(i) & GPIO_bit(i)) 363 PGSR(gpio_to_bank(i)) |= GPIO_bit(i); 364 else 365 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i); 366 } 367 } 368 369 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { 370 saved_gafr[0][i] = GAFR_L(i); 371 saved_gafr[1][i] = GAFR_U(i); 372 saved_gpdr[i] = GPDR(i * 32); 373 saved_gplr[i] = GPLR(i * 32); 374 saved_pgsr[i] = PGSR(i); 375 376 GPSR(i * 32) = PGSR(i); 377 GPCR(i * 32) = ~PGSR(i); 378 } 379 380 /* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */ 381 for (i = 0; i < pxa_last_gpio; i++) { 382 if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) || 383 ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) && 384 (saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i)))) 385 GPDR(i) |= GPIO_bit(i); 386 else 387 GPDR(i) &= ~GPIO_bit(i); 388 } 389 390 return 0; 391 } 392 393 static void pxa2xx_mfp_resume(void) 394 { 395 int i; 396 397 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { 398 GAFR_L(i) = saved_gafr[0][i]; 399 GAFR_U(i) = saved_gafr[1][i]; 400 GPSR(i * 32) = saved_gplr[i]; 401 GPCR(i * 32) = ~saved_gplr[i]; 402 GPDR(i * 32) = saved_gpdr[i]; 403 PGSR(i) = saved_pgsr[i]; 404 } 405 PSSR = PSSR_RDH | PSSR_PH; 406 } 407 #else 408 #define pxa2xx_mfp_suspend NULL 409 #define pxa2xx_mfp_resume NULL 410 #endif 411 412 struct syscore_ops pxa2xx_mfp_syscore_ops = { 413 .suspend = pxa2xx_mfp_suspend, 414 .resume = pxa2xx_mfp_resume, 415 }; 416 417 static int __init pxa2xx_mfp_init(void) 418 { 419 int i; 420 421 if (!cpu_is_pxa2xx()) 422 return 0; 423 424 if (cpu_is_pxa25x()) 425 pxa25x_mfp_init(); 426 427 if (cpu_is_pxa27x()) 428 pxa27x_mfp_init(); 429 430 /* clear RDH bit to enable GPIO receivers after reset/sleep exit */ 431 PSSR = PSSR_RDH; 432 433 /* initialize gafr_run[], pgsr_lpm[] from existing values */ 434 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) 435 gpdr_lpm[i] = GPDR(i * 32); 436 437 return 0; 438 } 439 postcore_initcall(pxa2xx_mfp_init); 440