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->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         .name = "gpio_wkup",
 197         .match_table = mpc52xx_wkup_gpiochip_match,
 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(&regs->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(&regs->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(&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 = 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(&regs->simple_ddr, chip->shadow_ddr);
 299
 300         /* Finally enable the pin */
 301         chip->shadow_gpioe |= 1 << (31 - gpio);
 302         out_be32(&regs->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 __devinit mpc52xx_simple_gpiochip_probe(struct of_device *ofdev,
 312                                         const struct of_device_id *match)
 313 {
 314         struct mpc52xx_gpiochip *chip;
 315         struct of_gpio_chip *ofchip;
 316         struct mpc52xx_gpio __iomem *regs;
 317         int ret;
 318
 319         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 320         if (!chip)
 321                 return -ENOMEM;
 322
 323         ofchip = &chip->mmchip.of_gc;
 324
 325         ofchip->gpio_cells          = 2;
 326         ofchip->gc.ngpio            = 32;
 327         ofchip->gc.direction_input  = mpc52xx_simple_gpio_dir_in;
 328         ofchip->gc.direction_output = mpc52xx_simple_gpio_dir_out;
 329         ofchip->gc.get              = mpc52xx_simple_gpio_get;
 330         ofchip->gc.set              = mpc52xx_simple_gpio_set;
 331
 332         ret = of_mm_gpiochip_add(ofdev->node, &chip->mmchip);
 333         if (ret)
 334                 return ret;
 335
 336         regs = chip->mmchip.regs;
 337         chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
 338         chip->shadow_ddr = in_be32(&regs->simple_ddr);
 339         chip->shadow_dvo = in_be32(&regs->simple_dvo);
 340
 341         return 0;
 342 }
 343
 344 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
 345         {
 346                 .compatible = "fsl,mpc5200-gpio",
 347         },
 348         {}
 349 };
 350
 351 static struct of_platform_driver mpc52xx_simple_gpiochip_driver = {
 352         .name = "gpio",
 353         .match_table = mpc52xx_simple_gpiochip_match,
 354         .probe = mpc52xx_simple_gpiochip_probe,
 355         .remove = mpc52xx_gpiochip_remove,
 356 };
 357
 358 static int __init mpc52xx_gpio_init(void)
 359 {
 360         if (of_register_platform_driver(&mpc52xx_wkup_gpiochip_driver))
 361                 printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
 362
 363         if (of_register_platform_driver(&mpc52xx_simple_gpiochip_driver))
 364                 printk(KERN_ERR "Unable to register simple GPIO driver\n");
 365
 366         return 0;
 367 }
 368
 369
 370 /* Make sure we get initialised before anyone else tries to use us */
 371 subsys_initcall(mpc52xx_gpio_init);
 372
 373 /* No exit call at the moment as we cannot unregister of gpio chips */
 374
 375 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
 376 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
 377 MODULE_LICENSE("GPL v2");
 378