drivers/gpio/gpio-mpc5200.c

   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(&regs->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(&regs->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(&regs->wkup_ddr, chip->shadow_ddr);
 113
 114         /* and enable the pin */
 115         chip->shadow_gpioe |= 1 << (7 - gpio);
 116         out_8(&regs->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(&regs->wkup_ddr, chip->shadow_ddr);
 139
 140         /* Finally enable the pin */
 141         chip->shadow_gpioe |= 1 << (7 - gpio);
 142         out_8(&regs->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(&regs->wkup_gpioe);
 178         chip->shadow_ddr = in_8(&regs->wkup_ddr);
 179         chip->shadow_dvo = in_8(&regs->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(&regs->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(&regs->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(&regs->simple_ddr, chip->shadow_ddr);
 277
 278         /* and enable the pin */
 279         chip->shadow_gpioe |= 1 << (31 - gpio);
 280         out_be32(&regs->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(&regs->simple_ddr, chip->shadow_ddr);
 304
 305         /* Finally enable the pin */
 306         chip->shadow_gpioe |= 1 << (31 - gpio);
 307         out_be32(&regs->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(&regs->simple_gpioe);
 343         chip->shadow_ddr = in_be32(&regs->simple_ddr);
 344         chip->shadow_dvo = in_be32(&regs->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