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/of_gpio.h>
  23 #include <linux/io.h>
  24 #include <linux/of_platform.h>
  25
  26 #include <asm/gpio.h>
  27 #include <asm/mpc52xx.h>
  28 #include <sysdev/fsl_soc.h>
  29
  30 static DEFINE_SPINLOCK(gpio_lock);
  31
  32 struct mpc52xx_gpiochip {
  33         struct of_mm_gpio_chip mmchip;
  34         unsigned int shadow_dvo;
  35         unsigned int shadow_gpioe;
  36         unsigned int shadow_ddr;
  37 };
  38
  39 /*
  40  * GPIO LIB API implementation for wakeup GPIOs.
  41  *
  42  * There's a maximum of 8 wakeup GPIOs. Which of these are available
  43  * for use depends on your board setup.
  44  *
  45  * 0 -> GPIO_WKUP_7
  46  * 1 -> GPIO_WKUP_6
  47  * 2 -> PSC6_1
  48  * 3 -> PSC6_0
  49  * 4 -> ETH_17
  50  * 5 -> PSC3_9
  51  * 6 -> PSC2_4
  52  * 7 -> PSC1_4
  53  *
  54  */
  55 static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
  56 {
  57         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
  58         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
  59         unsigned int ret;
  60
  61         ret = (in_8(&regs->wkup_ival) >> (7 - gpio)) & 1;
  62
  63         pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
  64
  65         return ret;
  66 }
  67
  68 static inline void
  69 __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
  70 {
  71         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
  72         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
  73                         struct mpc52xx_gpiochip, mmchip);
  74         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
  75
  76         if (val)
  77                 chip->shadow_dvo |= 1 << (7 - gpio);
  78         else
  79                 chip->shadow_dvo &= ~(1 << (7 - gpio));
  80
  81         out_8(&regs->wkup_dvo, chip->shadow_dvo);
  82 }
  83
  84 static void
  85 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
  86 {
  87         unsigned long flags;
  88
  89         spin_lock_irqsave(&gpio_lock, flags);
  90
  91         __mpc52xx_wkup_gpio_set(gc, gpio, val);
  92
  93         spin_unlock_irqrestore(&gpio_lock, flags);
  94
  95         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
  96 }
  97
  98 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
  99 {
 100         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 101         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 102                         struct mpc52xx_gpiochip, mmchip);
 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 = container_of(mm_gc,
 127                         struct mpc52xx_gpiochip, mmchip);
 128         unsigned long flags;
 129
 130         spin_lock_irqsave(&gpio_lock, flags);
 131
 132         __mpc52xx_wkup_gpio_set(gc, gpio, val);
 133
 134         /* Then set direction */
 135         chip->shadow_ddr |= 1 << (7 - gpio);
 136         out_8(&regs->wkup_ddr, chip->shadow_ddr);
 137
 138         /* Finally enable the pin */
 139         chip->shadow_gpioe |= 1 << (7 - gpio);
 140         out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
 141
 142         spin_unlock_irqrestore(&gpio_lock, flags);
 143
 144         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 145
 146         return 0;
 147 }
 148
 149 static int __devinit mpc52xx_wkup_gpiochip_probe(struct of_device *ofdev,
 150                                         const struct of_device_id *match)
 151 {
 152         struct mpc52xx_gpiochip *chip;
 153         struct mpc52xx_gpio_wkup __iomem *regs;
 154         struct of_gpio_chip *ofchip;
 155         int ret;
 156
 157         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 158         if (!chip)
 159                 return -ENOMEM;
 160
 161         ofchip = &chip->mmchip.of_gc;
 162
 163         ofchip->gpio_cells          = 2;
 164         ofchip->gc.ngpio            = 8;
 165         ofchip->gc.direction_input  = mpc52xx_wkup_gpio_dir_in;
 166         ofchip->gc.direction_output = mpc52xx_wkup_gpio_dir_out;
 167         ofchip->gc.get              = mpc52xx_wkup_gpio_get;
 168         ofchip->gc.set              = mpc52xx_wkup_gpio_set;
 169
 170         ret = of_mm_gpiochip_add(ofdev->node, &chip->mmchip);
 171         if (ret)
 172                 return ret;
 173
 174         regs = chip->mmchip.regs;
 175         chip->shadow_gpioe = in_8(&regs->wkup_gpioe);
 176         chip->shadow_ddr = in_8(&regs->wkup_ddr);
 177         chip->shadow_dvo = in_8(&regs->wkup_dvo);
 178
 179         return 0;
 180 }
 181
 182 static int mpc52xx_gpiochip_remove(struct of_device *ofdev)
 183 {
 184         return -EBUSY;
 185 }
 186
 187 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
 188         {
 189                 .compatible = "fsl,mpc5200-gpio-wkup",
 190         },
 191         {}
 192 };
 193
 194 static struct of_platform_driver mpc52xx_wkup_gpiochip_driver = {
 195         .name = "gpio_wkup",
 196         .match_table = mpc52xx_wkup_gpiochip_match,
 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(&regs->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(&regs->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(&regs->simple_ddr, chip->shadow_ddr);
 271
 272         /* and enable the pin */
 273         chip->shadow_gpioe |= 1 << (31 - gpio);
 274         out_be32(&regs->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(&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 __devinit mpc52xx_simple_gpiochip_probe(struct of_device *ofdev,
 311                                         const struct of_device_id *match)
 312 {
 313         struct mpc52xx_gpiochip *chip;
 314         struct of_gpio_chip *ofchip;
 315         struct mpc52xx_gpio __iomem *regs;
 316         int ret;
 317
 318         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 319         if (!chip)
 320                 return -ENOMEM;
 321
 322         ofchip = &chip->mmchip.of_gc;
 323
 324         ofchip->gpio_cells          = 2;
 325         ofchip->gc.ngpio            = 32;
 326         ofchip->gc.direction_input  = mpc52xx_simple_gpio_dir_in;
 327         ofchip->gc.direction_output = mpc52xx_simple_gpio_dir_out;
 328         ofchip->gc.get              = mpc52xx_simple_gpio_get;
 329         ofchip->gc.set              = mpc52xx_simple_gpio_set;
 330
 331         ret = of_mm_gpiochip_add(ofdev->node, &chip->mmchip);
 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         {
 345                 .compatible = "fsl,mpc5200-gpio",
 346         },
 347         {}
 348 };
 349
 350 static struct of_platform_driver mpc52xx_simple_gpiochip_driver = {
 351         .name = "gpio",
 352         .match_table = mpc52xx_simple_gpiochip_match,
 353         .probe = mpc52xx_simple_gpiochip_probe,
 354         .remove = mpc52xx_gpiochip_remove,
 355 };
 356
 357 static int __init mpc52xx_gpio_init(void)
 358 {
 359         if (of_register_platform_driver(&mpc52xx_wkup_gpiochip_driver))
 360                 printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
 361
 362         if (of_register_platform_driver(&mpc52xx_simple_gpiochip_driver))
 363                 printk(KERN_ERR "Unable to register simple GPIO driver\n");
 364
 365         return 0;
 366 }
 367
 368
 369 /* Make sure we get initialised before anyone else tries to use us */
 370 subsys_initcall(mpc52xx_gpio_init);
 371
 372 /* No exit call at the moment as we cannot unregister of gpio chips */
 373
 374 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
 375 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
 376 MODULE_LICENSE("GPL v2");
 377