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 21 #include <mach/gpio.h> 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 PWER_WE35 (1 << 24) 33 34 struct gpio_desc { 35 unsigned valid : 1; 36 unsigned can_wakeup : 1; 37 unsigned keypad_gpio : 1; 38 unsigned dir_inverted : 1; 39 unsigned int mask; /* bit mask in PWER or PKWR */ 40 unsigned int mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */ 41 unsigned long config; 42 }; 43 44 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1]; 45 46 static unsigned long gpdr_lpm[4]; 47 48 static int __mfp_config_gpio(unsigned gpio, unsigned long c) 49 { 50 unsigned long gafr, mask = GPIO_bit(gpio); 51 int bank = gpio_to_bank(gpio); 52 int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */ 53 int shft = (gpio & 0xf) << 1; 54 int fn = MFP_AF(c); 55 int is_out = (c & MFP_DIR_OUT) ? 1 : 0; 56 57 if (fn > 3) 58 return -EINVAL; 59 60 /* alternate function and direction at run-time */ 61 gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank); 62 gafr = (gafr & ~(0x3 << shft)) | (fn << shft); 63 64 if (uorl == 0) 65 GAFR_L(bank) = gafr; 66 else 67 GAFR_U(bank) = gafr; 68 69 if (is_out ^ gpio_desc[gpio].dir_inverted) 70 GPDR(gpio) |= mask; 71 else 72 GPDR(gpio) &= ~mask; 73 74 /* alternate function and direction at low power mode */ 75 switch (c & MFP_LPM_STATE_MASK) { 76 case MFP_LPM_DRIVE_HIGH: 77 PGSR(bank) |= mask; 78 is_out = 1; 79 break; 80 case MFP_LPM_DRIVE_LOW: 81 PGSR(bank) &= ~mask; 82 is_out = 1; 83 break; 84 case MFP_LPM_INPUT: 85 case MFP_LPM_DEFAULT: 86 break; 87 default: 88 /* warning and fall through, treat as MFP_LPM_DEFAULT */ 89 pr_warning("%s: GPIO%d: unsupported low power mode\n", 90 __func__, gpio); 91 break; 92 } 93 94 if (is_out ^ gpio_desc[gpio].dir_inverted) 95 gpdr_lpm[bank] |= mask; 96 else 97 gpdr_lpm[bank] &= ~mask; 98 99 /* give early warning if MFP_LPM_CAN_WAKEUP is set on the 100 * configurations of those pins not able to wakeup 101 */ 102 if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) { 103 pr_warning("%s: GPIO%d unable to wakeup\n", 104 __func__, gpio); 105 return -EINVAL; 106 } 107 108 if ((c & MFP_LPM_CAN_WAKEUP) && is_out) { 109 pr_warning("%s: output GPIO%d unable to wakeup\n", 110 __func__, gpio); 111 return -EINVAL; 112 } 113 114 return 0; 115 } 116 117 static inline int __mfp_validate(int mfp) 118 { 119 int gpio = mfp_to_gpio(mfp); 120 121 if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) { 122 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio); 123 return -1; 124 } 125 126 return gpio; 127 } 128 129 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num) 130 { 131 unsigned long flags; 132 unsigned long *c; 133 int i, gpio; 134 135 for (i = 0, c = mfp_cfgs; i < num; i++, c++) { 136 137 gpio = __mfp_validate(MFP_PIN(*c)); 138 if (gpio < 0) 139 continue; 140 141 local_irq_save(flags); 142 143 gpio_desc[gpio].config = *c; 144 __mfp_config_gpio(gpio, *c); 145 146 local_irq_restore(flags); 147 } 148 } 149 150 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm) 151 { 152 unsigned long flags, c; 153 int gpio; 154 155 gpio = __mfp_validate(mfp); 156 if (gpio < 0) 157 return; 158 159 local_irq_save(flags); 160 161 c = gpio_desc[gpio].config; 162 c = (c & ~MFP_LPM_STATE_MASK) | lpm; 163 __mfp_config_gpio(gpio, c); 164 165 local_irq_restore(flags); 166 } 167 168 int gpio_set_wake(unsigned int gpio, unsigned int on) 169 { 170 struct gpio_desc *d; 171 unsigned long c, mux_taken; 172 173 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127)) 174 return -EINVAL; 175 176 d = &gpio_desc[gpio]; 177 c = d->config; 178 179 if (!d->valid) 180 return -EINVAL; 181 182 /* Allow keypad GPIOs to wakeup system when 183 * configured as generic GPIOs. 184 */ 185 if (d->keypad_gpio && (MFP_AF(d->config) == 0) && 186 (d->config & MFP_LPM_CAN_WAKEUP)) { 187 if (on) 188 PKWR |= d->mask; 189 else 190 PKWR &= ~d->mask; 191 return 0; 192 } 193 194 mux_taken = (PWER & d->mux_mask) & (~d->mask); 195 if (on && mux_taken) 196 return -EBUSY; 197 198 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) { 199 if (on) { 200 PWER = (PWER & ~d->mux_mask) | d->mask; 201 202 if (c & MFP_LPM_EDGE_RISE) 203 PRER |= d->mask; 204 else 205 PRER &= ~d->mask; 206 207 if (c & MFP_LPM_EDGE_FALL) 208 PFER |= d->mask; 209 else 210 PFER &= ~d->mask; 211 } else { 212 PWER &= ~d->mask; 213 PRER &= ~d->mask; 214 PFER &= ~d->mask; 215 } 216 } 217 return 0; 218 } 219 220 #ifdef CONFIG_PXA25x 221 static void __init pxa25x_mfp_init(void) 222 { 223 int i; 224 225 for (i = 0; i <= pxa_last_gpio; i++) 226 gpio_desc[i].valid = 1; 227 228 for (i = 0; i <= 15; i++) { 229 gpio_desc[i].can_wakeup = 1; 230 gpio_desc[i].mask = GPIO_bit(i); 231 } 232 233 /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the 234 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1. 235 */ 236 for (i = 86; i <= pxa_last_gpio; i++) 237 gpio_desc[i].dir_inverted = 1; 238 } 239 #else 240 static inline void pxa25x_mfp_init(void) {} 241 #endif /* CONFIG_PXA25x */ 242 243 #ifdef CONFIG_PXA27x 244 static int pxa27x_pkwr_gpio[] = { 245 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94, 246 95, 96, 97, 98, 99, 100, 101, 102 247 }; 248 249 int keypad_set_wake(unsigned int on) 250 { 251 unsigned int i, gpio, mask = 0; 252 struct gpio_desc *d; 253 254 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { 255 256 gpio = pxa27x_pkwr_gpio[i]; 257 d = &gpio_desc[gpio]; 258 259 /* skip if configured as generic GPIO */ 260 if (MFP_AF(d->config) == 0) 261 continue; 262 263 if (d->config & MFP_LPM_CAN_WAKEUP) 264 mask |= gpio_desc[gpio].mask; 265 } 266 267 if (on) 268 PKWR |= mask; 269 else 270 PKWR &= ~mask; 271 return 0; 272 } 273 274 #define PWER_WEMUX2_GPIO38 (1 << 16) 275 #define PWER_WEMUX2_GPIO53 (2 << 16) 276 #define PWER_WEMUX2_GPIO40 (3 << 16) 277 #define PWER_WEMUX2_GPIO36 (4 << 16) 278 #define PWER_WEMUX2_MASK (7 << 16) 279 #define PWER_WEMUX3_GPIO31 (1 << 19) 280 #define PWER_WEMUX3_GPIO113 (2 << 19) 281 #define PWER_WEMUX3_MASK (3 << 19) 282 283 #define INIT_GPIO_DESC_MUXED(mux, gpio) \ 284 do { \ 285 gpio_desc[(gpio)].can_wakeup = 1; \ 286 gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \ 287 gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \ 288 } while (0) 289 290 static void __init pxa27x_mfp_init(void) 291 { 292 int i, gpio; 293 294 for (i = 0; i <= pxa_last_gpio; i++) { 295 /* skip GPIO2, 5, 6, 7, 8, they are not 296 * valid pins allow configuration 297 */ 298 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8) 299 continue; 300 301 gpio_desc[i].valid = 1; 302 } 303 304 /* Keypad GPIOs */ 305 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { 306 gpio = pxa27x_pkwr_gpio[i]; 307 gpio_desc[gpio].can_wakeup = 1; 308 gpio_desc[gpio].keypad_gpio = 1; 309 gpio_desc[gpio].mask = 1 << i; 310 } 311 312 /* Overwrite GPIO13 as a PWER wakeup source */ 313 for (i = 0; i <= 15; i++) { 314 /* skip GPIO2, 5, 6, 7, 8 */ 315 if (GPIO_bit(i) & 0x1e4) 316 continue; 317 318 gpio_desc[i].can_wakeup = 1; 319 gpio_desc[i].mask = GPIO_bit(i); 320 } 321 322 gpio_desc[35].can_wakeup = 1; 323 gpio_desc[35].mask = PWER_WE35; 324 325 INIT_GPIO_DESC_MUXED(WEMUX3, 31); 326 INIT_GPIO_DESC_MUXED(WEMUX3, 113); 327 INIT_GPIO_DESC_MUXED(WEMUX2, 38); 328 INIT_GPIO_DESC_MUXED(WEMUX2, 53); 329 INIT_GPIO_DESC_MUXED(WEMUX2, 40); 330 INIT_GPIO_DESC_MUXED(WEMUX2, 36); 331 } 332 #else 333 static inline void pxa27x_mfp_init(void) {} 334 #endif /* CONFIG_PXA27x */ 335 336 #ifdef CONFIG_PM 337 static unsigned long saved_gafr[2][4]; 338 static unsigned long saved_gpdr[4]; 339 static unsigned long saved_pgsr[4]; 340 341 static int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state) 342 { 343 int i; 344 345 /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */ 346 for (i = 0; i < pxa_last_gpio; i++) { 347 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) && 348 (GPDR(i) & GPIO_bit(i))) { 349 if (GPLR(i) & GPIO_bit(i)) 350 PGSR(i) |= GPIO_bit(i); 351 else 352 PGSR(i) &= ~GPIO_bit(i); 353 } 354 } 355 356 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { 357 358 saved_gafr[0][i] = GAFR_L(i); 359 saved_gafr[1][i] = GAFR_U(i); 360 saved_gpdr[i] = GPDR(i * 32); 361 saved_pgsr[i] = PGSR(i); 362 363 GPDR(i * 32) = gpdr_lpm[i]; 364 } 365 return 0; 366 } 367 368 static int pxa2xx_mfp_resume(struct sys_device *d) 369 { 370 int i; 371 372 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { 373 GAFR_L(i) = saved_gafr[0][i]; 374 GAFR_U(i) = saved_gafr[1][i]; 375 GPDR(i * 32) = saved_gpdr[i]; 376 PGSR(i) = saved_pgsr[i]; 377 } 378 PSSR = PSSR_RDH | PSSR_PH; 379 return 0; 380 } 381 #else 382 #define pxa2xx_mfp_suspend NULL 383 #define pxa2xx_mfp_resume NULL 384 #endif 385 386 struct sysdev_class pxa2xx_mfp_sysclass = { 387 .name = "mfp", 388 .suspend = pxa2xx_mfp_suspend, 389 .resume = pxa2xx_mfp_resume, 390 }; 391 392 static int __init pxa2xx_mfp_init(void) 393 { 394 int i; 395 396 if (!cpu_is_pxa2xx()) 397 return 0; 398 399 if (cpu_is_pxa25x()) 400 pxa25x_mfp_init(); 401 402 if (cpu_is_pxa27x()) 403 pxa27x_mfp_init(); 404 405 /* clear RDH bit to enable GPIO receivers after reset/sleep exit */ 406 PSSR = PSSR_RDH; 407 408 /* initialize gafr_run[], pgsr_lpm[] from existing values */ 409 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) 410 gpdr_lpm[i] = GPDR(i * 32); 411 412 return sysdev_class_register(&pxa2xx_mfp_sysclass); 413 } 414 postcore_initcall(pxa2xx_mfp_init); 415