1 /* 2 * MPC52xx gpio driver 3 * 4 * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 8 * as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20 #include <linux/of.h> 21 #include <linux/kernel.h> 22 #include <linux/slab.h> 23 #include <linux/of_gpio.h> 24 #include <linux/io.h> 25 #include <linux/of_platform.h> 26 #include <linux/module.h> 27 28 #include <asm/gpio.h> 29 #include <asm/mpc52xx.h> 30 #include <sysdev/fsl_soc.h> 31 32 static DEFINE_SPINLOCK(gpio_lock); 33 34 struct mpc52xx_gpiochip { 35 struct of_mm_gpio_chip mmchip; 36 unsigned int shadow_dvo; 37 unsigned int shadow_gpioe; 38 unsigned int shadow_ddr; 39 }; 40 41 /* 42 * GPIO LIB API implementation for wakeup GPIOs. 43 * 44 * There's a maximum of 8 wakeup GPIOs. Which of these are available 45 * for use depends on your board setup. 46 * 47 * 0 -> GPIO_WKUP_7 48 * 1 -> GPIO_WKUP_6 49 * 2 -> PSC6_1 50 * 3 -> PSC6_0 51 * 4 -> ETH_17 52 * 5 -> PSC3_9 53 * 6 -> PSC2_4 54 * 7 -> PSC1_4 55 * 56 */ 57 static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio) 58 { 59 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 60 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 61 unsigned int ret; 62 63 ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1; 64 65 pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret); 66 67 return ret; 68 } 69 70 static inline void 71 __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 72 { 73 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 74 struct mpc52xx_gpiochip *chip = container_of(mm_gc, 75 struct mpc52xx_gpiochip, mmchip); 76 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 77 78 if (val) 79 chip->shadow_dvo |= 1 << (7 - gpio); 80 else 81 chip->shadow_dvo &= ~(1 << (7 - gpio)); 82 83 out_8(®s->wkup_dvo, chip->shadow_dvo); 84 } 85 86 static void 87 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 88 { 89 unsigned long flags; 90 91 spin_lock_irqsave(&gpio_lock, flags); 92 93 __mpc52xx_wkup_gpio_set(gc, gpio, val); 94 95 spin_unlock_irqrestore(&gpio_lock, flags); 96 97 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 98 } 99 100 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) 101 { 102 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 103 struct mpc52xx_gpiochip *chip = container_of(mm_gc, 104 struct mpc52xx_gpiochip, mmchip); 105 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 106 unsigned long flags; 107 108 spin_lock_irqsave(&gpio_lock, flags); 109 110 /* set the direction */ 111 chip->shadow_ddr &= ~(1 << (7 - gpio)); 112 out_8(®s->wkup_ddr, chip->shadow_ddr); 113 114 /* and enable the pin */ 115 chip->shadow_gpioe |= 1 << (7 - gpio); 116 out_8(®s->wkup_gpioe, chip->shadow_gpioe); 117 118 spin_unlock_irqrestore(&gpio_lock, flags); 119 120 return 0; 121 } 122 123 static int 124 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) 125 { 126 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 127 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 128 struct mpc52xx_gpiochip *chip = container_of(mm_gc, 129 struct mpc52xx_gpiochip, mmchip); 130 unsigned long flags; 131 132 spin_lock_irqsave(&gpio_lock, flags); 133 134 __mpc52xx_wkup_gpio_set(gc, gpio, val); 135 136 /* Then set direction */ 137 chip->shadow_ddr |= 1 << (7 - gpio); 138 out_8(®s->wkup_ddr, chip->shadow_ddr); 139 140 /* Finally enable the pin */ 141 chip->shadow_gpioe |= 1 << (7 - gpio); 142 out_8(®s->wkup_gpioe, chip->shadow_gpioe); 143 144 spin_unlock_irqrestore(&gpio_lock, flags); 145 146 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 147 148 return 0; 149 } 150 151 static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev) 152 { 153 struct mpc52xx_gpiochip *chip; 154 struct mpc52xx_gpio_wkup __iomem *regs; 155 struct gpio_chip *gc; 156 int ret; 157 158 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL); 159 if (!chip) 160 return -ENOMEM; 161 162 platform_set_drvdata(ofdev, chip); 163 164 gc = &chip->mmchip.gc; 165 166 gc->ngpio = 8; 167 gc->direction_input = mpc52xx_wkup_gpio_dir_in; 168 gc->direction_output = mpc52xx_wkup_gpio_dir_out; 169 gc->get = mpc52xx_wkup_gpio_get; 170 gc->set = mpc52xx_wkup_gpio_set; 171 172 ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); 173 if (ret) 174 return ret; 175 176 regs = chip->mmchip.regs; 177 chip->shadow_gpioe = in_8(®s->wkup_gpioe); 178 chip->shadow_ddr = in_8(®s->wkup_ddr); 179 chip->shadow_dvo = in_8(®s->wkup_dvo); 180 181 return 0; 182 } 183 184 static int mpc52xx_gpiochip_remove(struct platform_device *ofdev) 185 { 186 struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev); 187 188 of_mm_gpiochip_remove(&chip->mmchip); 189 190 return 0; 191 } 192 193 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = { 194 { .compatible = "fsl,mpc5200-gpio-wkup", }, 195 {} 196 }; 197 198 static struct platform_driver mpc52xx_wkup_gpiochip_driver = { 199 .driver = { 200 .name = "mpc5200-gpio-wkup", 201 .of_match_table = mpc52xx_wkup_gpiochip_match, 202 }, 203 .probe = mpc52xx_wkup_gpiochip_probe, 204 .remove = mpc52xx_gpiochip_remove, 205 }; 206 207 /* 208 * GPIO LIB API implementation for simple GPIOs 209 * 210 * There's a maximum of 32 simple GPIOs. Which of these are available 211 * for use depends on your board setup. 212 * The numbering reflects the bit numbering in the port registers: 213 * 214 * 0..1 > reserved 215 * 2..3 > IRDA 216 * 4..7 > ETHR 217 * 8..11 > reserved 218 * 12..15 > USB 219 * 16..17 > reserved 220 * 18..23 > PSC3 221 * 24..27 > PSC2 222 * 28..31 > PSC1 223 */ 224 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio) 225 { 226 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 227 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 228 unsigned int ret; 229 230 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1; 231 232 return ret; 233 } 234 235 static inline void 236 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 237 { 238 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 239 struct mpc52xx_gpiochip *chip = container_of(mm_gc, 240 struct mpc52xx_gpiochip, mmchip); 241 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 242 243 if (val) 244 chip->shadow_dvo |= 1 << (31 - gpio); 245 else 246 chip->shadow_dvo &= ~(1 << (31 - gpio)); 247 out_be32(®s->simple_dvo, chip->shadow_dvo); 248 } 249 250 static void 251 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 252 { 253 unsigned long flags; 254 255 spin_lock_irqsave(&gpio_lock, flags); 256 257 __mpc52xx_simple_gpio_set(gc, gpio, val); 258 259 spin_unlock_irqrestore(&gpio_lock, flags); 260 261 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 262 } 263 264 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) 265 { 266 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 267 struct mpc52xx_gpiochip *chip = container_of(mm_gc, 268 struct mpc52xx_gpiochip, mmchip); 269 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 270 unsigned long flags; 271 272 spin_lock_irqsave(&gpio_lock, flags); 273 274 /* set the direction */ 275 chip->shadow_ddr &= ~(1 << (31 - gpio)); 276 out_be32(®s->simple_ddr, chip->shadow_ddr); 277 278 /* and enable the pin */ 279 chip->shadow_gpioe |= 1 << (31 - gpio); 280 out_be32(®s->simple_gpioe, chip->shadow_gpioe); 281 282 spin_unlock_irqrestore(&gpio_lock, flags); 283 284 return 0; 285 } 286 287 static int 288 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) 289 { 290 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 291 struct mpc52xx_gpiochip *chip = container_of(mm_gc, 292 struct mpc52xx_gpiochip, mmchip); 293 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 294 unsigned long flags; 295 296 spin_lock_irqsave(&gpio_lock, flags); 297 298 /* First set initial value */ 299 __mpc52xx_simple_gpio_set(gc, gpio, val); 300 301 /* Then set direction */ 302 chip->shadow_ddr |= 1 << (31 - gpio); 303 out_be32(®s->simple_ddr, chip->shadow_ddr); 304 305 /* Finally enable the pin */ 306 chip->shadow_gpioe |= 1 << (31 - gpio); 307 out_be32(®s->simple_gpioe, chip->shadow_gpioe); 308 309 spin_unlock_irqrestore(&gpio_lock, flags); 310 311 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 312 313 return 0; 314 } 315 316 static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev) 317 { 318 struct mpc52xx_gpiochip *chip; 319 struct gpio_chip *gc; 320 struct mpc52xx_gpio __iomem *regs; 321 int ret; 322 323 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL); 324 if (!chip) 325 return -ENOMEM; 326 327 platform_set_drvdata(ofdev, chip); 328 329 gc = &chip->mmchip.gc; 330 331 gc->ngpio = 32; 332 gc->direction_input = mpc52xx_simple_gpio_dir_in; 333 gc->direction_output = mpc52xx_simple_gpio_dir_out; 334 gc->get = mpc52xx_simple_gpio_get; 335 gc->set = mpc52xx_simple_gpio_set; 336 337 ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); 338 if (ret) 339 return ret; 340 341 regs = chip->mmchip.regs; 342 chip->shadow_gpioe = in_be32(®s->simple_gpioe); 343 chip->shadow_ddr = in_be32(®s->simple_ddr); 344 chip->shadow_dvo = in_be32(®s->simple_dvo); 345 346 return 0; 347 } 348 349 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = { 350 { .compatible = "fsl,mpc5200-gpio", }, 351 {} 352 }; 353 354 static struct platform_driver mpc52xx_simple_gpiochip_driver = { 355 .driver = { 356 .name = "mpc5200-gpio", 357 .of_match_table = mpc52xx_simple_gpiochip_match, 358 }, 359 .probe = mpc52xx_simple_gpiochip_probe, 360 .remove = mpc52xx_gpiochip_remove, 361 }; 362 363 static int __init mpc52xx_gpio_init(void) 364 { 365 if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver)) 366 printk(KERN_ERR "Unable to register wakeup GPIO driver\n"); 367 368 if (platform_driver_register(&mpc52xx_simple_gpiochip_driver)) 369 printk(KERN_ERR "Unable to register simple GPIO driver\n"); 370 371 return 0; 372 } 373 374 /* Make sure we get initialised before anyone else tries to use us */ 375 subsys_initcall(mpc52xx_gpio_init); 376 377 static void __exit mpc52xx_gpio_exit(void) 378 { 379 platform_driver_unregister(&mpc52xx_wkup_gpiochip_driver); 380 381 platform_driver_unregister(&mpc52xx_simple_gpiochip_driver); 382 } 383 module_exit(mpc52xx_gpio_exit); 384 385 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); 386 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de"); 387 MODULE_LICENSE("GPL v2"); 388 389