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 = 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(&regs->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(&regs->wkup_ddr, chip->shadow_ddr);
 111
 112         /* and enable the pin */
 113         chip->shadow_gpioe |= 1 << (7 - gpio);
 114         out_8(&regs->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(&regs->wkup_ddr, chip->shadow_ddr);
 136
 137         /* Finally enable the pin */
 138         chip->shadow_gpioe |= 1 << (7 - gpio);
 139         out_8(&regs->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(&regs->wkup_gpioe);
 175         chip->shadow_ddr = in_8(&regs->wkup_ddr);
 176         chip->shadow_dvo = in_8(&regs->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(&regs->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(&regs->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(&regs->simple_ddr, chip->shadow_ddr);
 272
 273         /* and enable the pin */
 274         chip->shadow_gpioe |= 1 << (31 - gpio);
 275         out_be32(&regs->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(&regs->simple_ddr, chip->shadow_ddr);
 298
 299         /* Finally enable the pin */
 300         chip->shadow_gpioe |= 1 << (31 - gpio);
 301         out_be32(&regs->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(&regs->simple_gpioe);
 337         chip->shadow_ddr = in_be32(&regs->simple_ddr);
 338         chip->shadow_dvo = in_be32(&regs->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