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/mpc52xx.h> 29 #include <sysdev/fsl_soc.h> 30 31 static DEFINE_SPINLOCK(gpio_lock); 32 33 struct mpc52xx_gpiochip { 34 struct of_mm_gpio_chip mmchip; 35 unsigned int shadow_dvo; 36 unsigned int shadow_gpioe; 37 unsigned int shadow_ddr; 38 }; 39 40 /* 41 * GPIO LIB API implementation for wakeup GPIOs. 42 * 43 * There's a maximum of 8 wakeup GPIOs. Which of these are available 44 * for use depends on your board setup. 45 * 46 * 0 -> GPIO_WKUP_7 47 * 1 -> GPIO_WKUP_6 48 * 2 -> PSC6_1 49 * 3 -> PSC6_0 50 * 4 -> ETH_17 51 * 5 -> PSC3_9 52 * 6 -> PSC2_4 53 * 7 -> PSC1_4 54 * 55 */ 56 static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio) 57 { 58 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 59 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 60 unsigned int ret; 61 62 ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1; 63 64 pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret); 65 66 return ret; 67 } 68 69 static inline void 70 __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 71 { 72 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 73 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 74 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 75 76 if (val) 77 chip->shadow_dvo |= 1 << (7 - gpio); 78 else 79 chip->shadow_dvo &= ~(1 << (7 - gpio)); 80 81 out_8(®s->wkup_dvo, chip->shadow_dvo); 82 } 83 84 static void 85 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 86 { 87 unsigned long flags; 88 89 spin_lock_irqsave(&gpio_lock, flags); 90 91 __mpc52xx_wkup_gpio_set(gc, gpio, val); 92 93 spin_unlock_irqrestore(&gpio_lock, flags); 94 95 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 96 } 97 98 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) 99 { 100 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 101 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 102 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 103 unsigned long flags; 104 105 spin_lock_irqsave(&gpio_lock, flags); 106 107 /* set the direction */ 108 chip->shadow_ddr &= ~(1 << (7 - gpio)); 109 out_8(®s->wkup_ddr, chip->shadow_ddr); 110 111 /* and enable the pin */ 112 chip->shadow_gpioe |= 1 << (7 - gpio); 113 out_8(®s->wkup_gpioe, chip->shadow_gpioe); 114 115 spin_unlock_irqrestore(&gpio_lock, flags); 116 117 return 0; 118 } 119 120 static int 121 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) 122 { 123 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 124 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 125 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 126 unsigned long flags; 127 128 spin_lock_irqsave(&gpio_lock, flags); 129 130 __mpc52xx_wkup_gpio_set(gc, gpio, val); 131 132 /* Then set direction */ 133 chip->shadow_ddr |= 1 << (7 - gpio); 134 out_8(®s->wkup_ddr, chip->shadow_ddr); 135 136 /* Finally enable the pin */ 137 chip->shadow_gpioe |= 1 << (7 - gpio); 138 out_8(®s->wkup_gpioe, chip->shadow_gpioe); 139 140 spin_unlock_irqrestore(&gpio_lock, flags); 141 142 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 143 144 return 0; 145 } 146 147 static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev) 148 { 149 struct mpc52xx_gpiochip *chip; 150 struct mpc52xx_gpio_wkup __iomem *regs; 151 struct gpio_chip *gc; 152 int ret; 153 154 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL); 155 if (!chip) 156 return -ENOMEM; 157 158 platform_set_drvdata(ofdev, chip); 159 160 gc = &chip->mmchip.gc; 161 162 gc->ngpio = 8; 163 gc->direction_input = mpc52xx_wkup_gpio_dir_in; 164 gc->direction_output = mpc52xx_wkup_gpio_dir_out; 165 gc->get = mpc52xx_wkup_gpio_get; 166 gc->set = mpc52xx_wkup_gpio_set; 167 168 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip); 169 if (ret) 170 return ret; 171 172 regs = chip->mmchip.regs; 173 chip->shadow_gpioe = in_8(®s->wkup_gpioe); 174 chip->shadow_ddr = in_8(®s->wkup_ddr); 175 chip->shadow_dvo = in_8(®s->wkup_dvo); 176 177 return 0; 178 } 179 180 static int mpc52xx_gpiochip_remove(struct platform_device *ofdev) 181 { 182 struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev); 183 184 of_mm_gpiochip_remove(&chip->mmchip); 185 186 return 0; 187 } 188 189 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = { 190 { .compatible = "fsl,mpc5200-gpio-wkup", }, 191 {} 192 }; 193 194 static struct platform_driver mpc52xx_wkup_gpiochip_driver = { 195 .driver = { 196 .name = "mpc5200-gpio-wkup", 197 .of_match_table = mpc52xx_wkup_gpiochip_match, 198 }, 199 .probe = mpc52xx_wkup_gpiochip_probe, 200 .remove = mpc52xx_gpiochip_remove, 201 }; 202 203 /* 204 * GPIO LIB API implementation for simple GPIOs 205 * 206 * There's a maximum of 32 simple GPIOs. Which of these are available 207 * for use depends on your board setup. 208 * The numbering reflects the bit numbering in the port registers: 209 * 210 * 0..1 > reserved 211 * 2..3 > IRDA 212 * 4..7 > ETHR 213 * 8..11 > reserved 214 * 12..15 > USB 215 * 16..17 > reserved 216 * 18..23 > PSC3 217 * 24..27 > PSC2 218 * 28..31 > PSC1 219 */ 220 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio) 221 { 222 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 223 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 224 unsigned int ret; 225 226 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1; 227 228 return ret; 229 } 230 231 static inline void 232 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 233 { 234 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 235 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 236 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 237 238 if (val) 239 chip->shadow_dvo |= 1 << (31 - gpio); 240 else 241 chip->shadow_dvo &= ~(1 << (31 - gpio)); 242 out_be32(®s->simple_dvo, chip->shadow_dvo); 243 } 244 245 static void 246 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 247 { 248 unsigned long flags; 249 250 spin_lock_irqsave(&gpio_lock, flags); 251 252 __mpc52xx_simple_gpio_set(gc, gpio, val); 253 254 spin_unlock_irqrestore(&gpio_lock, flags); 255 256 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 257 } 258 259 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) 260 { 261 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 262 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 263 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 264 unsigned long flags; 265 266 spin_lock_irqsave(&gpio_lock, flags); 267 268 /* set the direction */ 269 chip->shadow_ddr &= ~(1 << (31 - gpio)); 270 out_be32(®s->simple_ddr, chip->shadow_ddr); 271 272 /* and enable the pin */ 273 chip->shadow_gpioe |= 1 << (31 - gpio); 274 out_be32(®s->simple_gpioe, chip->shadow_gpioe); 275 276 spin_unlock_irqrestore(&gpio_lock, flags); 277 278 return 0; 279 } 280 281 static int 282 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) 283 { 284 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 285 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 286 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 287 unsigned long flags; 288 289 spin_lock_irqsave(&gpio_lock, flags); 290 291 /* First set initial value */ 292 __mpc52xx_simple_gpio_set(gc, gpio, val); 293 294 /* Then set direction */ 295 chip->shadow_ddr |= 1 << (31 - gpio); 296 out_be32(®s->simple_ddr, chip->shadow_ddr); 297 298 /* Finally enable the pin */ 299 chip->shadow_gpioe |= 1 << (31 - gpio); 300 out_be32(®s->simple_gpioe, chip->shadow_gpioe); 301 302 spin_unlock_irqrestore(&gpio_lock, flags); 303 304 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 305 306 return 0; 307 } 308 309 static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev) 310 { 311 struct mpc52xx_gpiochip *chip; 312 struct gpio_chip *gc; 313 struct mpc52xx_gpio __iomem *regs; 314 int ret; 315 316 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL); 317 if (!chip) 318 return -ENOMEM; 319 320 platform_set_drvdata(ofdev, chip); 321 322 gc = &chip->mmchip.gc; 323 324 gc->ngpio = 32; 325 gc->direction_input = mpc52xx_simple_gpio_dir_in; 326 gc->direction_output = mpc52xx_simple_gpio_dir_out; 327 gc->get = mpc52xx_simple_gpio_get; 328 gc->set = mpc52xx_simple_gpio_set; 329 330 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip); 331 if (ret) 332 return ret; 333 334 regs = chip->mmchip.regs; 335 chip->shadow_gpioe = in_be32(®s->simple_gpioe); 336 chip->shadow_ddr = in_be32(®s->simple_ddr); 337 chip->shadow_dvo = in_be32(®s->simple_dvo); 338 339 return 0; 340 } 341 342 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = { 343 { .compatible = "fsl,mpc5200-gpio", }, 344 {} 345 }; 346 347 static struct platform_driver mpc52xx_simple_gpiochip_driver = { 348 .driver = { 349 .name = "mpc5200-gpio", 350 .of_match_table = mpc52xx_simple_gpiochip_match, 351 }, 352 .probe = mpc52xx_simple_gpiochip_probe, 353 .remove = mpc52xx_gpiochip_remove, 354 }; 355 356 static struct platform_driver * const drivers[] = { 357 &mpc52xx_wkup_gpiochip_driver, 358 &mpc52xx_simple_gpiochip_driver, 359 }; 360 361 static int __init mpc52xx_gpio_init(void) 362 { 363 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 364 } 365 366 /* Make sure we get initialised before anyone else tries to use us */ 367 subsys_initcall(mpc52xx_gpio_init); 368 369 static void __exit mpc52xx_gpio_exit(void) 370 { 371 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 372 } 373 module_exit(mpc52xx_gpio_exit); 374 375 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); 376 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de"); 377 MODULE_LICENSE("GPL v2"); 378 379