arch/powerpc/platforms/52xx/mpc52xx_gpio.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
  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(&regs->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(&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 = 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(&regs->wkup_ddr, chip->shadow_ddr);
 112
 113         /* and enable the pin */
 114         chip->shadow_gpioe |= 1 << (7 - gpio);
 115         out_8(&regs->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(&regs->wkup_ddr, chip->shadow_ddr);
 138
 139         /* Finally enable the pin */
 140         chip->shadow_gpioe |= 1 << (7 - gpio);
 141         out_8(&regs->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 of_device *ofdev,
 151                                         const struct of_device_id *match)
 152 {
 153         struct mpc52xx_gpiochip *chip;
 154         struct mpc52xx_gpio_wkup __iomem *regs;
 155         struct of_gpio_chip *ofchip;
 156         int ret;
 157
 158         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 159         if (!chip)
 160                 return -ENOMEM;
 161
 162         ofchip = &chip->mmchip.of_gc;
 163
 164         ofchip->gpio_cells          = 2;
 165         ofchip->gc.ngpio            = 8;
 166         ofchip->gc.direction_input  = mpc52xx_wkup_gpio_dir_in;
 167         ofchip->gc.direction_output = mpc52xx_wkup_gpio_dir_out;
 168         ofchip->gc.get              = mpc52xx_wkup_gpio_get;
 169         ofchip->gc.set              = mpc52xx_wkup_gpio_set;
 170
 171         ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
 172         if (ret)
 173                 return ret;
 174
 175         regs = chip->mmchip.regs;
 176         chip->shadow_gpioe = in_8(&regs->wkup_gpioe);
 177         chip->shadow_ddr = in_8(&regs->wkup_ddr);
 178         chip->shadow_dvo = in_8(&regs->wkup_dvo);
 179
 180         return 0;
 181 }
 182
 183 static int mpc52xx_gpiochip_remove(struct of_device *ofdev)
 184 {
 185         return -EBUSY;
 186 }
 187
 188 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
 189         {
 190                 .compatible = "fsl,mpc5200-gpio-wkup",
 191         },
 192         {}
 193 };
 194
 195 static struct of_platform_driver mpc52xx_wkup_gpiochip_driver = {
 196         .driver = {
 197                 .name = "gpio_wkup",
 198                 .owner = THIS_MODULE,
 199                 .of_match_table = mpc52xx_wkup_gpiochip_match,
 200         },
 201         .probe = mpc52xx_wkup_gpiochip_probe,
 202         .remove = mpc52xx_gpiochip_remove,
 203 };
 204
 205 /*
 206  * GPIO LIB API implementation for simple GPIOs
 207  *
 208  * There's a maximum of 32 simple GPIOs. Which of these are available
 209  * for use depends on your board setup.
 210  * The numbering reflects the bit numbering in the port registers:
 211  *
 212  *  0..1  > reserved
 213  *  2..3  > IRDA
 214  *  4..7  > ETHR
 215  *  8..11 > reserved
 216  * 12..15 > USB
 217  * 16..17 > reserved
 218  * 18..23 > PSC3
 219  * 24..27 > PSC2
 220  * 28..31 > PSC1
 221  */
 222 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
 223 {
 224         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 225         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 226         unsigned int ret;
 227
 228         ret = (in_be32(&regs->simple_ival) >> (31 - gpio)) & 1;
 229
 230         return ret;
 231 }
 232
 233 static inline void
 234 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 235 {
 236         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 237         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 238                         struct mpc52xx_gpiochip, mmchip);
 239         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 240
 241         if (val)
 242                 chip->shadow_dvo |= 1 << (31 - gpio);
 243         else
 244                 chip->shadow_dvo &= ~(1 << (31 - gpio));
 245         out_be32(&regs->simple_dvo, chip->shadow_dvo);
 246 }
 247
 248 static void
 249 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 250 {
 251         unsigned long flags;
 252
 253         spin_lock_irqsave(&gpio_lock, flags);
 254
 255         __mpc52xx_simple_gpio_set(gc, gpio, val);
 256
 257         spin_unlock_irqrestore(&gpio_lock, flags);
 258
 259         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 260 }
 261
 262 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 263 {
 264         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 265         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 266                         struct mpc52xx_gpiochip, mmchip);
 267         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 268         unsigned long flags;
 269
 270         spin_lock_irqsave(&gpio_lock, flags);
 271
 272         /* set the direction */
 273         chip->shadow_ddr &= ~(1 << (31 - gpio));
 274         out_be32(&regs->simple_ddr, chip->shadow_ddr);
 275
 276         /* and enable the pin */
 277         chip->shadow_gpioe |= 1 << (31 - gpio);
 278         out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
 279
 280         spin_unlock_irqrestore(&gpio_lock, flags);
 281
 282         return 0;
 283 }
 284
 285 static int
 286 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 287 {
 288         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 289         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 290                         struct mpc52xx_gpiochip, mmchip);
 291         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 292         unsigned long flags;
 293
 294         spin_lock_irqsave(&gpio_lock, flags);
 295
 296         /* First set initial value */
 297         __mpc52xx_simple_gpio_set(gc, gpio, val);
 298
 299         /* Then set direction */
 300         chip->shadow_ddr |= 1 << (31 - gpio);
 301         out_be32(&regs->simple_ddr, chip->shadow_ddr);
 302
 303         /* Finally enable the pin */
 304         chip->shadow_gpioe |= 1 << (31 - gpio);
 305         out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
 306
 307         spin_unlock_irqrestore(&gpio_lock, flags);
 308
 309         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 310
 311         return 0;
 312 }
 313
 314 static int __devinit mpc52xx_simple_gpiochip_probe(struct of_device *ofdev,
 315                                         const struct of_device_id *match)
 316 {
 317         struct mpc52xx_gpiochip *chip;
 318         struct of_gpio_chip *ofchip;
 319         struct mpc52xx_gpio __iomem *regs;
 320         int ret;
 321
 322         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 323         if (!chip)
 324                 return -ENOMEM;
 325
 326         ofchip = &chip->mmchip.of_gc;
 327
 328         ofchip->gpio_cells          = 2;
 329         ofchip->gc.ngpio            = 32;
 330         ofchip->gc.direction_input  = mpc52xx_simple_gpio_dir_in;
 331         ofchip->gc.direction_output = mpc52xx_simple_gpio_dir_out;
 332         ofchip->gc.get              = mpc52xx_simple_gpio_get;
 333         ofchip->gc.set              = mpc52xx_simple_gpio_set;
 334
 335         ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
 336         if (ret)
 337                 return ret;
 338
 339         regs = chip->mmchip.regs;
 340         chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
 341         chip->shadow_ddr = in_be32(&regs->simple_ddr);
 342         chip->shadow_dvo = in_be32(&regs->simple_dvo);
 343
 344         return 0;
 345 }
 346
 347 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
 348         {
 349                 .compatible = "fsl,mpc5200-gpio",
 350         },
 351         {}
 352 };
 353
 354 static struct of_platform_driver mpc52xx_simple_gpiochip_driver = {
 355         .driver = {
 356                 .name = "gpio",
 357                 .owner = THIS_MODULE,
 358                 .of_match_table = mpc52xx_simple_gpiochip_match,
 359         },
 360         .probe = mpc52xx_simple_gpiochip_probe,
 361         .remove = mpc52xx_gpiochip_remove,
 362 };
 363
 364 static int __init mpc52xx_gpio_init(void)
 365 {
 366         if (of_register_platform_driver(&mpc52xx_wkup_gpiochip_driver))
 367                 printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
 368
 369         if (of_register_platform_driver(&mpc52xx_simple_gpiochip_driver))
 370                 printk(KERN_ERR "Unable to register simple GPIO driver\n");
 371
 372         return 0;
 373 }
 374
 375
 376 /* Make sure we get initialised before anyone else tries to use us */
 377 subsys_initcall(mpc52xx_gpio_init);
 378
 379 /* No exit call at the moment as we cannot unregister of gpio chips */
 380
 381 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
 382 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
 383 MODULE_LICENSE("GPL v2");
 384