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 for (i = 0; i <= pxa_last_gpio; i++) 230 gpio_desc[i].valid = 1; 231 232 for (i = 0; i <= 15; i++) { 233 gpio_desc[i].can_wakeup = 1; 234 gpio_desc[i].mask = GPIO_bit(i); 235 } 236 237 /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the 238 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1. 239 */ 240 for (i = 86; i <= pxa_last_gpio; i++) 241 gpio_desc[i].dir_inverted = 1; 242 } 243 #else 244 static inline void pxa25x_mfp_init(void) {} 245 #endif /* CONFIG_PXA25x */ 246 247 #ifdef CONFIG_PXA27x 248 static int pxa27x_pkwr_gpio[] = { 249 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94, 250 95, 96, 97, 98, 99, 100, 101, 102 251 }; 252 253 int keypad_set_wake(unsigned int on) 254 { 255 unsigned int i, gpio, mask = 0; 256 struct gpio_desc *d; 257 258 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { 259 260 gpio = pxa27x_pkwr_gpio[i]; 261 d = &gpio_desc[gpio]; 262 263 /* skip if configured as generic GPIO */ 264 if (MFP_AF(d->config) == 0) 265 continue; 266 267 if (d->config & MFP_LPM_CAN_WAKEUP) 268 mask |= gpio_desc[gpio].mask; 269 } 270 271 if (on) 272 PKWR |= mask; 273 else 274 PKWR &= ~mask; 275 return 0; 276 } 277 278 #define PWER_WEMUX2_GPIO38 (1 << 16) 279 #define PWER_WEMUX2_GPIO53 (2 << 16) 280 #define PWER_WEMUX2_GPIO40 (3 << 16) 281 #define PWER_WEMUX2_GPIO36 (4 << 16) 282 #define PWER_WEMUX2_MASK (7 << 16) 283 #define PWER_WEMUX3_GPIO31 (1 << 19) 284 #define PWER_WEMUX3_GPIO113 (2 << 19) 285 #define PWER_WEMUX3_MASK (3 << 19) 286 287 #define INIT_GPIO_DESC_MUXED(mux, gpio) \ 288 do { \ 289 gpio_desc[(gpio)].can_wakeup = 1; \ 290 gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \ 291 gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \ 292 } while (0) 293 294 static void __init pxa27x_mfp_init(void) 295 { 296 int i, gpio; 297 298 for (i = 0; i <= pxa_last_gpio; i++) { 299 /* skip GPIO2, 5, 6, 7, 8, they are not 300 * valid pins allow configuration 301 */ 302 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8) 303 continue; 304 305 gpio_desc[i].valid = 1; 306 } 307 308 /* Keypad GPIOs */ 309 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { 310 gpio = pxa27x_pkwr_gpio[i]; 311 gpio_desc[gpio].can_wakeup = 1; 312 gpio_desc[gpio].keypad_gpio = 1; 313 gpio_desc[gpio].mask = 1 << i; 314 } 315 316 /* Overwrite GPIO13 as a PWER wakeup source */ 317 for (i = 0; i <= 15; i++) { 318 /* skip GPIO2, 5, 6, 7, 8 */ 319 if (GPIO_bit(i) & 0x1e4) 320 continue; 321 322 gpio_desc[i].can_wakeup = 1; 323 gpio_desc[i].mask = GPIO_bit(i); 324 } 325 326 gpio_desc[35].can_wakeup = 1; 327 gpio_desc[35].mask = PWER_WE35; 328 329 INIT_GPIO_DESC_MUXED(WEMUX3, 31); 330 INIT_GPIO_DESC_MUXED(WEMUX3, 113); 331 INIT_GPIO_DESC_MUXED(WEMUX2, 38); 332 INIT_GPIO_DESC_MUXED(WEMUX2, 53); 333 INIT_GPIO_DESC_MUXED(WEMUX2, 40); 334 INIT_GPIO_DESC_MUXED(WEMUX2, 36); 335 } 336 #else 337 static inline void pxa27x_mfp_init(void) {} 338 #endif /* CONFIG_PXA27x */ 339 340 #ifdef CONFIG_PM 341 static unsigned long saved_gafr[2][4]; 342 static unsigned long saved_gpdr[4]; 343 static unsigned long saved_pgsr[4]; 344 345 static int pxa2xx_mfp_suspend(void) 346 { 347 int i; 348 349 /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */ 350 for (i = 0; i < pxa_last_gpio; i++) { 351 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) && 352 (GPDR(i) & GPIO_bit(i))) { 353 if (GPLR(i) & GPIO_bit(i)) 354 PGSR(gpio_to_bank(i)) |= GPIO_bit(i); 355 else 356 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i); 357 } 358 } 359 360 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { 361 362 saved_gafr[0][i] = GAFR_L(i); 363 saved_gafr[1][i] = GAFR_U(i); 364 saved_gpdr[i] = GPDR(i * 32); 365 saved_pgsr[i] = PGSR(i); 366 367 GPDR(i * 32) = gpdr_lpm[i]; 368 } 369 return 0; 370 } 371 372 static void pxa2xx_mfp_resume(void) 373 { 374 int i; 375 376 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { 377 GAFR_L(i) = saved_gafr[0][i]; 378 GAFR_U(i) = saved_gafr[1][i]; 379 GPDR(i * 32) = saved_gpdr[i]; 380 PGSR(i) = saved_pgsr[i]; 381 } 382 PSSR = PSSR_RDH | PSSR_PH; 383 } 384 #else 385 #define pxa2xx_mfp_suspend NULL 386 #define pxa2xx_mfp_resume NULL 387 #endif 388 389 struct syscore_ops pxa2xx_mfp_syscore_ops = { 390 .suspend = pxa2xx_mfp_suspend, 391 .resume = pxa2xx_mfp_resume, 392 }; 393 394 static int __init pxa2xx_mfp_init(void) 395 { 396 int i; 397 398 if (!cpu_is_pxa2xx()) 399 return 0; 400 401 if (cpu_is_pxa25x()) 402 pxa25x_mfp_init(); 403 404 if (cpu_is_pxa27x()) 405 pxa27x_mfp_init(); 406 407 /* clear RDH bit to enable GPIO receivers after reset/sleep exit */ 408 PSSR = PSSR_RDH; 409 410 /* initialize gafr_run[], pgsr_lpm[] from existing values */ 411 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) 412 gpdr_lpm[i] = GPDR(i * 32); 413 414 return 0; 415 } 416 postcore_initcall(pxa2xx_mfp_init); 417