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 = kzalloc(sizeof(*chip), GFP_KERNEL); 159 if (!chip) 160 return -ENOMEM; 161 162 gc = &chip->mmchip.gc; 163 164 gc->ngpio = 8; 165 gc->direction_input = mpc52xx_wkup_gpio_dir_in; 166 gc->direction_output = mpc52xx_wkup_gpio_dir_out; 167 gc->get = mpc52xx_wkup_gpio_get; 168 gc->set = mpc52xx_wkup_gpio_set; 169 170 ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); 171 if (ret) 172 return ret; 173 174 regs = chip->mmchip.regs; 175 chip->shadow_gpioe = in_8(®s->wkup_gpioe); 176 chip->shadow_ddr = in_8(®s->wkup_ddr); 177 chip->shadow_dvo = in_8(®s->wkup_dvo); 178 179 return 0; 180 } 181 182 static int mpc52xx_gpiochip_remove(struct platform_device *ofdev) 183 { 184 return -EBUSY; 185 } 186 187 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = { 188 { .compatible = "fsl,mpc5200-gpio-wkup", }, 189 {} 190 }; 191 192 static struct platform_driver mpc52xx_wkup_gpiochip_driver = { 193 .driver = { 194 .name = "mpc5200-gpio-wkup", 195 .owner = THIS_MODULE, 196 .of_match_table = mpc52xx_wkup_gpiochip_match, 197 }, 198 .probe = mpc52xx_wkup_gpiochip_probe, 199 .remove = mpc52xx_gpiochip_remove, 200 }; 201 202 /* 203 * GPIO LIB API implementation for simple GPIOs 204 * 205 * There's a maximum of 32 simple GPIOs. Which of these are available 206 * for use depends on your board setup. 207 * The numbering reflects the bit numbering in the port registers: 208 * 209 * 0..1 > reserved 210 * 2..3 > IRDA 211 * 4..7 > ETHR 212 * 8..11 > reserved 213 * 12..15 > USB 214 * 16..17 > reserved 215 * 18..23 > PSC3 216 * 24..27 > PSC2 217 * 28..31 > PSC1 218 */ 219 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio) 220 { 221 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 222 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 223 unsigned int ret; 224 225 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1; 226 227 return ret; 228 } 229 230 static inline void 231 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 232 { 233 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 234 struct mpc52xx_gpiochip *chip = container_of(mm_gc, 235 struct mpc52xx_gpiochip, mmchip); 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 = container_of(mm_gc, 263 struct mpc52xx_gpiochip, mmchip); 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 = container_of(mm_gc, 287 struct mpc52xx_gpiochip, mmchip); 288 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 289 unsigned long flags; 290 291 spin_lock_irqsave(&gpio_lock, flags); 292 293 /* First set initial value */ 294 __mpc52xx_simple_gpio_set(gc, gpio, val); 295 296 /* Then set direction */ 297 chip->shadow_ddr |= 1 << (31 - gpio); 298 out_be32(®s->simple_ddr, chip->shadow_ddr); 299 300 /* Finally enable the pin */ 301 chip->shadow_gpioe |= 1 << (31 - gpio); 302 out_be32(®s->simple_gpioe, chip->shadow_gpioe); 303 304 spin_unlock_irqrestore(&gpio_lock, flags); 305 306 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 307 308 return 0; 309 } 310 311 static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev) 312 { 313 struct mpc52xx_gpiochip *chip; 314 struct gpio_chip *gc; 315 struct mpc52xx_gpio __iomem *regs; 316 int ret; 317 318 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 319 if (!chip) 320 return -ENOMEM; 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(ofdev->dev.of_node, &chip->mmchip); 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 .owner = THIS_MODULE, 351 .of_match_table = mpc52xx_simple_gpiochip_match, 352 }, 353 .probe = mpc52xx_simple_gpiochip_probe, 354 .remove = mpc52xx_gpiochip_remove, 355 }; 356 357 static int __init mpc52xx_gpio_init(void) 358 { 359 if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver)) 360 printk(KERN_ERR "Unable to register wakeup GPIO driver\n"); 361 362 if (platform_driver_register(&mpc52xx_simple_gpiochip_driver)) 363 printk(KERN_ERR "Unable to register simple GPIO driver\n"); 364 365 return 0; 366 } 367 368 369 /* Make sure we get initialised before anyone else tries to use us */ 370 subsys_initcall(mpc52xx_gpio_init); 371 372 /* No exit call at the moment as we cannot unregister of gpio chips */ 373 374 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); 375 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de"); 376 MODULE_LICENSE("GPL v2"); 377 378