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_DEFAULT: 85 break; 86 default: 87 /* warning and fall through, treat as MFP_LPM_DEFAULT */ 88 pr_warning("%s: GPIO%d: unsupported low power mode\n", 89 __func__, gpio); 90 break; 91 } 92 93 if (is_out ^ gpio_desc[gpio].dir_inverted) 94 gpdr_lpm[bank] |= mask; 95 else 96 gpdr_lpm[bank] &= ~mask; 97 98 /* give early warning if MFP_LPM_CAN_WAKEUP is set on the 99 * configurations of those pins not able to wakeup 100 */ 101 if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) { 102 pr_warning("%s: GPIO%d unable to wakeup\n", 103 __func__, gpio); 104 return -EINVAL; 105 } 106 107 if ((c & MFP_LPM_CAN_WAKEUP) && is_out) { 108 pr_warning("%s: output GPIO%d unable to wakeup\n", 109 __func__, gpio); 110 return -EINVAL; 111 } 112 113 return 0; 114 } 115 116 static inline int __mfp_validate(int mfp) 117 { 118 int gpio = mfp_to_gpio(mfp); 119 120 if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) { 121 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio); 122 return -1; 123 } 124 125 return gpio; 126 } 127 128 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num) 129 { 130 unsigned long flags; 131 unsigned long *c; 132 int i, gpio; 133 134 for (i = 0, c = mfp_cfgs; i < num; i++, c++) { 135 136 gpio = __mfp_validate(MFP_PIN(*c)); 137 if (gpio < 0) 138 continue; 139 140 local_irq_save(flags); 141 142 gpio_desc[gpio].config = *c; 143 __mfp_config_gpio(gpio, *c); 144 145 local_irq_restore(flags); 146 } 147 } 148 149 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm) 150 { 151 unsigned long flags, c; 152 int gpio; 153 154 gpio = __mfp_validate(mfp); 155 if (gpio < 0) 156 return; 157 158 local_irq_save(flags); 159 160 c = gpio_desc[gpio].config; 161 c = (c & ~MFP_LPM_STATE_MASK) | lpm; 162 __mfp_config_gpio(gpio, c); 163 164 local_irq_restore(flags); 165 } 166 167 int gpio_set_wake(unsigned int gpio, unsigned int on) 168 { 169 struct gpio_desc *d; 170 unsigned long c, mux_taken; 171 172 if (gpio > mfp_to_gpio(MFP_PIN_GPIO127)) 173 return -EINVAL; 174 175 d = &gpio_desc[gpio]; 176 c = d->config; 177 178 if (!d->valid) 179 return -EINVAL; 180 181 if (d->keypad_gpio) 182 return -EINVAL; 183 184 mux_taken = (PWER & d->mux_mask) & (~d->mask); 185 if (on && mux_taken) 186 return -EBUSY; 187 188 if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) { 189 if (on) { 190 PWER = (PWER & ~d->mux_mask) | d->mask; 191 192 if (c & MFP_LPM_EDGE_RISE) 193 PRER |= d->mask; 194 else 195 PRER &= ~d->mask; 196 197 if (c & MFP_LPM_EDGE_FALL) 198 PFER |= d->mask; 199 else 200 PFER &= ~d->mask; 201 } else { 202 PWER &= ~d->mask; 203 PRER &= ~d->mask; 204 PFER &= ~d->mask; 205 } 206 } 207 return 0; 208 } 209 210 #ifdef CONFIG_PXA25x 211 static void __init pxa25x_mfp_init(void) 212 { 213 int i; 214 215 for (i = 0; i <= pxa_last_gpio; i++) 216 gpio_desc[i].valid = 1; 217 218 for (i = 0; i <= 15; i++) { 219 gpio_desc[i].can_wakeup = 1; 220 gpio_desc[i].mask = GPIO_bit(i); 221 } 222 223 /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the 224 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1. 225 */ 226 for (i = 86; i <= pxa_last_gpio; i++) 227 gpio_desc[i].dir_inverted = 1; 228 } 229 #else 230 static inline void pxa25x_mfp_init(void) {} 231 #endif /* CONFIG_PXA25x */ 232 233 #ifdef CONFIG_PXA27x 234 static int pxa27x_pkwr_gpio[] = { 235 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94, 236 95, 96, 97, 98, 99, 100, 101, 102 237 }; 238 239 int keypad_set_wake(unsigned int on) 240 { 241 unsigned int i, gpio, mask = 0; 242 243 if (!on) { 244 PKWR = 0; 245 return 0; 246 } 247 248 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { 249 250 gpio = pxa27x_pkwr_gpio[i]; 251 252 if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP) 253 mask |= gpio_desc[gpio].mask; 254 } 255 256 PKWR = mask; 257 return 0; 258 } 259 260 #define PWER_WEMUX2_GPIO38 (1 << 16) 261 #define PWER_WEMUX2_GPIO53 (2 << 16) 262 #define PWER_WEMUX2_GPIO40 (3 << 16) 263 #define PWER_WEMUX2_GPIO36 (4 << 16) 264 #define PWER_WEMUX2_MASK (7 << 16) 265 #define PWER_WEMUX3_GPIO31 (1 << 19) 266 #define PWER_WEMUX3_GPIO113 (2 << 19) 267 #define PWER_WEMUX3_MASK (3 << 19) 268 269 #define INIT_GPIO_DESC_MUXED(mux, gpio) \ 270 do { \ 271 gpio_desc[(gpio)].can_wakeup = 1; \ 272 gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \ 273 gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \ 274 } while (0) 275 276 static void __init pxa27x_mfp_init(void) 277 { 278 int i, gpio; 279 280 for (i = 0; i <= pxa_last_gpio; i++) { 281 /* skip GPIO2, 5, 6, 7, 8, they are not 282 * valid pins allow configuration 283 */ 284 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8) 285 continue; 286 287 gpio_desc[i].valid = 1; 288 } 289 290 /* Keypad GPIOs */ 291 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { 292 gpio = pxa27x_pkwr_gpio[i]; 293 gpio_desc[gpio].can_wakeup = 1; 294 gpio_desc[gpio].keypad_gpio = 1; 295 gpio_desc[gpio].mask = 1 << i; 296 } 297 298 /* Overwrite GPIO13 as a PWER wakeup source */ 299 for (i = 0; i <= 15; i++) { 300 /* skip GPIO2, 5, 6, 7, 8 */ 301 if (GPIO_bit(i) & 0x1e4) 302 continue; 303 304 gpio_desc[i].can_wakeup = 1; 305 gpio_desc[i].mask = GPIO_bit(i); 306 } 307 308 gpio_desc[35].can_wakeup = 1; 309 gpio_desc[35].mask = PWER_WE35; 310 311 INIT_GPIO_DESC_MUXED(WEMUX3, 31); 312 INIT_GPIO_DESC_MUXED(WEMUX3, 113); 313 INIT_GPIO_DESC_MUXED(WEMUX2, 38); 314 INIT_GPIO_DESC_MUXED(WEMUX2, 53); 315 INIT_GPIO_DESC_MUXED(WEMUX2, 40); 316 INIT_GPIO_DESC_MUXED(WEMUX2, 36); 317 } 318 #else 319 static inline void pxa27x_mfp_init(void) {} 320 #endif /* CONFIG_PXA27x */ 321 322 #ifdef CONFIG_PM 323 static unsigned long saved_gafr[2][4]; 324 static unsigned long saved_gpdr[4]; 325 326 static int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state) 327 { 328 int i; 329 330 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { 331 332 saved_gafr[0][i] = GAFR_L(i); 333 saved_gafr[1][i] = GAFR_U(i); 334 saved_gpdr[i] = GPDR(i * 32); 335 336 GPDR(i * 32) = gpdr_lpm[i]; 337 } 338 return 0; 339 } 340 341 static int pxa2xx_mfp_resume(struct sys_device *d) 342 { 343 int i; 344 345 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { 346 GAFR_L(i) = saved_gafr[0][i]; 347 GAFR_U(i) = saved_gafr[1][i]; 348 GPDR(i * 32) = saved_gpdr[i]; 349 } 350 PSSR = PSSR_RDH | PSSR_PH; 351 return 0; 352 } 353 #else 354 #define pxa2xx_mfp_suspend NULL 355 #define pxa2xx_mfp_resume NULL 356 #endif 357 358 struct sysdev_class pxa2xx_mfp_sysclass = { 359 .name = "mfp", 360 .suspend = pxa2xx_mfp_suspend, 361 .resume = pxa2xx_mfp_resume, 362 }; 363 364 static int __init pxa2xx_mfp_init(void) 365 { 366 int i; 367 368 if (!cpu_is_pxa2xx()) 369 return 0; 370 371 if (cpu_is_pxa25x()) 372 pxa25x_mfp_init(); 373 374 if (cpu_is_pxa27x()) 375 pxa27x_mfp_init(); 376 377 /* initialize gafr_run[], pgsr_lpm[] from existing values */ 378 for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) 379 gpdr_lpm[i] = GPDR(i * 32); 380 381 return sysdev_class_register(&pxa2xx_mfp_sysclass); 382 } 383 postcore_initcall(pxa2xx_mfp_init); 384