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 27 #include <asm/gpio.h> 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 = container_of(mm_gc, 74 struct mpc52xx_gpiochip, mmchip); 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 = container_of(mm_gc, 103 struct mpc52xx_gpiochip, mmchip); 104 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 105 unsigned long flags; 106 107 spin_lock_irqsave(&gpio_lock, flags); 108 109 /* set the direction */ 110 chip->shadow_ddr &= ~(1 << (7 - gpio)); 111 out_8(®s->wkup_ddr, chip->shadow_ddr); 112 113 /* and enable the pin */ 114 chip->shadow_gpioe |= 1 << (7 - gpio); 115 out_8(®s->wkup_gpioe, chip->shadow_gpioe); 116 117 spin_unlock_irqrestore(&gpio_lock, flags); 118 119 return 0; 120 } 121 122 static int 123 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) 124 { 125 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 126 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 127 struct mpc52xx_gpiochip *chip = container_of(mm_gc, 128 struct mpc52xx_gpiochip, mmchip); 129 unsigned long flags; 130 131 spin_lock_irqsave(&gpio_lock, flags); 132 133 __mpc52xx_wkup_gpio_set(gc, gpio, val); 134 135 /* Then set direction */ 136 chip->shadow_ddr |= 1 << (7 - gpio); 137 out_8(®s->wkup_ddr, chip->shadow_ddr); 138 139 /* Finally enable the pin */ 140 chip->shadow_gpioe |= 1 << (7 - gpio); 141 out_8(®s->wkup_gpioe, chip->shadow_gpioe); 142 143 spin_unlock_irqrestore(&gpio_lock, flags); 144 145 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 146 147 return 0; 148 } 149 150 static int __devinit mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev) 151 { 152 struct mpc52xx_gpiochip *chip; 153 struct mpc52xx_gpio_wkup __iomem *regs; 154 struct gpio_chip *gc; 155 int ret; 156 157 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 158 if (!chip) 159 return -ENOMEM; 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(ofdev->dev.of_node, &chip->mmchip); 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 return -EBUSY; 184 } 185 186 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = { 187 { .compatible = "fsl,mpc5200-gpio-wkup", }, 188 {} 189 }; 190 191 static struct platform_driver mpc52xx_wkup_gpiochip_driver = { 192 .driver = { 193 .name = "mpc5200-gpio-wkup", 194 .owner = THIS_MODULE, 195 .of_match_table = mpc52xx_wkup_gpiochip_match, 196 }, 197 .probe = mpc52xx_wkup_gpiochip_probe, 198 .remove = mpc52xx_gpiochip_remove, 199 }; 200 201 /* 202 * GPIO LIB API implementation for simple GPIOs 203 * 204 * There's a maximum of 32 simple GPIOs. Which of these are available 205 * for use depends on your board setup. 206 * The numbering reflects the bit numbering in the port registers: 207 * 208 * 0..1 > reserved 209 * 2..3 > IRDA 210 * 4..7 > ETHR 211 * 8..11 > reserved 212 * 12..15 > USB 213 * 16..17 > reserved 214 * 18..23 > PSC3 215 * 24..27 > PSC2 216 * 28..31 > PSC1 217 */ 218 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio) 219 { 220 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 221 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 222 unsigned int ret; 223 224 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1; 225 226 return ret; 227 } 228 229 static inline void 230 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 231 { 232 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 233 struct mpc52xx_gpiochip *chip = container_of(mm_gc, 234 struct mpc52xx_gpiochip, mmchip); 235 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 236 237 if (val) 238 chip->shadow_dvo |= 1 << (31 - gpio); 239 else 240 chip->shadow_dvo &= ~(1 << (31 - gpio)); 241 out_be32(®s->simple_dvo, chip->shadow_dvo); 242 } 243 244 static void 245 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 246 { 247 unsigned long flags; 248 249 spin_lock_irqsave(&gpio_lock, flags); 250 251 __mpc52xx_simple_gpio_set(gc, gpio, val); 252 253 spin_unlock_irqrestore(&gpio_lock, flags); 254 255 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 256 } 257 258 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) 259 { 260 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 261 struct mpc52xx_gpiochip *chip = container_of(mm_gc, 262 struct mpc52xx_gpiochip, mmchip); 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 = container_of(mm_gc, 286 struct mpc52xx_gpiochip, mmchip); 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 __devinit 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 = kzalloc(sizeof(*chip), GFP_KERNEL); 318 if (!chip) 319 return -ENOMEM; 320 321 gc = &chip->mmchip.gc; 322 323 gc->ngpio = 32; 324 gc->direction_input = mpc52xx_simple_gpio_dir_in; 325 gc->direction_output = mpc52xx_simple_gpio_dir_out; 326 gc->get = mpc52xx_simple_gpio_get; 327 gc->set = mpc52xx_simple_gpio_set; 328 329 ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); 330 if (ret) 331 return ret; 332 333 regs = chip->mmchip.regs; 334 chip->shadow_gpioe = in_be32(®s->simple_gpioe); 335 chip->shadow_ddr = in_be32(®s->simple_ddr); 336 chip->shadow_dvo = in_be32(®s->simple_dvo); 337 338 return 0; 339 } 340 341 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = { 342 { .compatible = "fsl,mpc5200-gpio", }, 343 {} 344 }; 345 346 static struct platform_driver mpc52xx_simple_gpiochip_driver = { 347 .driver = { 348 .name = "mpc5200-gpio", 349 .owner = THIS_MODULE, 350 .of_match_table = mpc52xx_simple_gpiochip_match, 351 }, 352 .probe = mpc52xx_simple_gpiochip_probe, 353 .remove = mpc52xx_gpiochip_remove, 354 }; 355 356 static int __init mpc52xx_gpio_init(void) 357 { 358 if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver)) 359 printk(KERN_ERR "Unable to register wakeup GPIO driver\n"); 360 361 if (platform_driver_register(&mpc52xx_simple_gpiochip_driver)) 362 printk(KERN_ERR "Unable to register simple GPIO driver\n"); 363 364 return 0; 365 } 366 367 368 /* Make sure we get initialised before anyone else tries to use us */ 369 subsys_initcall(mpc52xx_gpio_init); 370 371 /* No exit call at the moment as we cannot unregister of gpio chips */ 372 373 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); 374 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de"); 375 MODULE_LICENSE("GPL v2"); 376 377