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 = gpiochip_get_data(gc); 75 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 76 77 if (val) 78 chip->shadow_dvo |= 1 << (7 - gpio); 79 else 80 chip->shadow_dvo &= ~(1 << (7 - gpio)); 81 82 out_8(®s->wkup_dvo, chip->shadow_dvo); 83 } 84 85 static void 86 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 87 { 88 unsigned long flags; 89 90 spin_lock_irqsave(&gpio_lock, flags); 91 92 __mpc52xx_wkup_gpio_set(gc, gpio, val); 93 94 spin_unlock_irqrestore(&gpio_lock, flags); 95 96 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 97 } 98 99 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) 100 { 101 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 102 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 103 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 104 unsigned long flags; 105 106 spin_lock_irqsave(&gpio_lock, flags); 107 108 /* set the direction */ 109 chip->shadow_ddr &= ~(1 << (7 - gpio)); 110 out_8(®s->wkup_ddr, chip->shadow_ddr); 111 112 /* and enable the pin */ 113 chip->shadow_gpioe |= 1 << (7 - gpio); 114 out_8(®s->wkup_gpioe, chip->shadow_gpioe); 115 116 spin_unlock_irqrestore(&gpio_lock, flags); 117 118 return 0; 119 } 120 121 static int 122 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) 123 { 124 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 125 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 126 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 127 unsigned long flags; 128 129 spin_lock_irqsave(&gpio_lock, flags); 130 131 __mpc52xx_wkup_gpio_set(gc, gpio, val); 132 133 /* Then set direction */ 134 chip->shadow_ddr |= 1 << (7 - gpio); 135 out_8(®s->wkup_ddr, chip->shadow_ddr); 136 137 /* Finally enable the pin */ 138 chip->shadow_gpioe |= 1 << (7 - gpio); 139 out_8(®s->wkup_gpioe, chip->shadow_gpioe); 140 141 spin_unlock_irqrestore(&gpio_lock, flags); 142 143 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 144 145 return 0; 146 } 147 148 static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev) 149 { 150 struct mpc52xx_gpiochip *chip; 151 struct mpc52xx_gpio_wkup __iomem *regs; 152 struct gpio_chip *gc; 153 int ret; 154 155 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL); 156 if (!chip) 157 return -ENOMEM; 158 159 platform_set_drvdata(ofdev, chip); 160 161 gc = &chip->mmchip.gc; 162 163 gc->ngpio = 8; 164 gc->direction_input = mpc52xx_wkup_gpio_dir_in; 165 gc->direction_output = mpc52xx_wkup_gpio_dir_out; 166 gc->get = mpc52xx_wkup_gpio_get; 167 gc->set = mpc52xx_wkup_gpio_set; 168 169 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip); 170 if (ret) 171 return ret; 172 173 regs = chip->mmchip.regs; 174 chip->shadow_gpioe = in_8(®s->wkup_gpioe); 175 chip->shadow_ddr = in_8(®s->wkup_ddr); 176 chip->shadow_dvo = in_8(®s->wkup_dvo); 177 178 return 0; 179 } 180 181 static int mpc52xx_gpiochip_remove(struct platform_device *ofdev) 182 { 183 struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev); 184 185 of_mm_gpiochip_remove(&chip->mmchip); 186 187 return 0; 188 } 189 190 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = { 191 { .compatible = "fsl,mpc5200-gpio-wkup", }, 192 {} 193 }; 194 195 static struct platform_driver mpc52xx_wkup_gpiochip_driver = { 196 .driver = { 197 .name = "mpc5200-gpio-wkup", 198 .of_match_table = mpc52xx_wkup_gpiochip_match, 199 }, 200 .probe = mpc52xx_wkup_gpiochip_probe, 201 .remove = mpc52xx_gpiochip_remove, 202 }; 203 204 /* 205 * GPIO LIB API implementation for simple GPIOs 206 * 207 * There's a maximum of 32 simple GPIOs. Which of these are available 208 * for use depends on your board setup. 209 * The numbering reflects the bit numbering in the port registers: 210 * 211 * 0..1 > reserved 212 * 2..3 > IRDA 213 * 4..7 > ETHR 214 * 8..11 > reserved 215 * 12..15 > USB 216 * 16..17 > reserved 217 * 18..23 > PSC3 218 * 24..27 > PSC2 219 * 28..31 > PSC1 220 */ 221 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio) 222 { 223 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 224 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 225 unsigned int ret; 226 227 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1; 228 229 return ret; 230 } 231 232 static inline void 233 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 234 { 235 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 236 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 237 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 238 239 if (val) 240 chip->shadow_dvo |= 1 << (31 - gpio); 241 else 242 chip->shadow_dvo &= ~(1 << (31 - gpio)); 243 out_be32(®s->simple_dvo, chip->shadow_dvo); 244 } 245 246 static void 247 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 248 { 249 unsigned long flags; 250 251 spin_lock_irqsave(&gpio_lock, flags); 252 253 __mpc52xx_simple_gpio_set(gc, gpio, val); 254 255 spin_unlock_irqrestore(&gpio_lock, flags); 256 257 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 258 } 259 260 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) 261 { 262 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 263 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 264 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 265 unsigned long flags; 266 267 spin_lock_irqsave(&gpio_lock, flags); 268 269 /* set the direction */ 270 chip->shadow_ddr &= ~(1 << (31 - gpio)); 271 out_be32(®s->simple_ddr, chip->shadow_ddr); 272 273 /* and enable the pin */ 274 chip->shadow_gpioe |= 1 << (31 - gpio); 275 out_be32(®s->simple_gpioe, chip->shadow_gpioe); 276 277 spin_unlock_irqrestore(&gpio_lock, flags); 278 279 return 0; 280 } 281 282 static int 283 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) 284 { 285 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 286 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 287 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 288 unsigned long flags; 289 290 spin_lock_irqsave(&gpio_lock, flags); 291 292 /* First set initial value */ 293 __mpc52xx_simple_gpio_set(gc, gpio, val); 294 295 /* Then set direction */ 296 chip->shadow_ddr |= 1 << (31 - gpio); 297 out_be32(®s->simple_ddr, chip->shadow_ddr); 298 299 /* Finally enable the pin */ 300 chip->shadow_gpioe |= 1 << (31 - gpio); 301 out_be32(®s->simple_gpioe, chip->shadow_gpioe); 302 303 spin_unlock_irqrestore(&gpio_lock, flags); 304 305 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 306 307 return 0; 308 } 309 310 static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev) 311 { 312 struct mpc52xx_gpiochip *chip; 313 struct gpio_chip *gc; 314 struct mpc52xx_gpio __iomem *regs; 315 int ret; 316 317 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL); 318 if (!chip) 319 return -ENOMEM; 320 321 platform_set_drvdata(ofdev, chip); 322 323 gc = &chip->mmchip.gc; 324 325 gc->ngpio = 32; 326 gc->direction_input = mpc52xx_simple_gpio_dir_in; 327 gc->direction_output = mpc52xx_simple_gpio_dir_out; 328 gc->get = mpc52xx_simple_gpio_get; 329 gc->set = mpc52xx_simple_gpio_set; 330 331 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip); 332 if (ret) 333 return ret; 334 335 regs = chip->mmchip.regs; 336 chip->shadow_gpioe = in_be32(®s->simple_gpioe); 337 chip->shadow_ddr = in_be32(®s->simple_ddr); 338 chip->shadow_dvo = in_be32(®s->simple_dvo); 339 340 return 0; 341 } 342 343 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = { 344 { .compatible = "fsl,mpc5200-gpio", }, 345 {} 346 }; 347 348 static struct platform_driver mpc52xx_simple_gpiochip_driver = { 349 .driver = { 350 .name = "mpc5200-gpio", 351 .of_match_table = mpc52xx_simple_gpiochip_match, 352 }, 353 .probe = mpc52xx_simple_gpiochip_probe, 354 .remove = mpc52xx_gpiochip_remove, 355 }; 356 357 static struct platform_driver * const drivers[] = { 358 &mpc52xx_wkup_gpiochip_driver, 359 &mpc52xx_simple_gpiochip_driver, 360 }; 361 362 static int __init mpc52xx_gpio_init(void) 363 { 364 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 365 } 366 367 /* Make sure we get initialised before anyone else tries to use us */ 368 subsys_initcall(mpc52xx_gpio_init); 369 370 static void __exit mpc52xx_gpio_exit(void) 371 { 372 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 373 } 374 module_exit(mpc52xx_gpio_exit); 375 376 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); 377 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de"); 378 MODULE_LICENSE("GPL v2"); 379 380