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
  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 platform_device *ofdev)
 151 {
 152         struct mpc52xx_gpiochip *chip;
 153         struct mpc52xx_gpio_wkup __iomem *regs;
 154         struct gpio_chip *gc;
 155         int ret;
 156
 157         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 158         if (!chip)
 159                 return -ENOMEM;
 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(ofdev->dev.of_node, &chip->mmchip);
 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         return -EBUSY;
 184 }
 185
 186 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
 187         { .compatible = "fsl,mpc5200-gpio-wkup", },
 188         {}
 189 };
 190
 191 static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
 192         .driver = {
 193                 .name = "mpc5200-gpio-wkup",
 194                 .owner = THIS_MODULE,
 195                 .of_match_table = mpc52xx_wkup_gpiochip_match,
 196         },
 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 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 = kzalloc(sizeof(*chip), GFP_KERNEL);
 318         if (!chip)
 319                 return -ENOMEM;
 320
 321         gc = &chip->mmchip.gc;
 322
 323         gc->ngpio            = 32;
 324         gc->direction_input  = mpc52xx_simple_gpio_dir_in;
 325         gc->direction_output = mpc52xx_simple_gpio_dir_out;
 326         gc->get              = mpc52xx_simple_gpio_get;
 327         gc->set              = mpc52xx_simple_gpio_set;
 328
 329         ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
 330         if (ret)
 331                 return ret;
 332
 333         regs = chip->mmchip.regs;
 334         chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
 335         chip->shadow_ddr = in_be32(&regs->simple_ddr);
 336         chip->shadow_dvo = in_be32(&regs->simple_dvo);
 337
 338         return 0;
 339 }
 340
 341 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
 342         { .compatible = "fsl,mpc5200-gpio", },
 343         {}
 344 };
 345
 346 static struct platform_driver mpc52xx_simple_gpiochip_driver = {
 347         .driver = {
 348                 .name = "mpc5200-gpio",
 349                 .owner = THIS_MODULE,
 350                 .of_match_table = mpc52xx_simple_gpiochip_match,
 351         },
 352         .probe = mpc52xx_simple_gpiochip_probe,
 353         .remove = mpc52xx_gpiochip_remove,
 354 };
 355
 356 static int __init mpc52xx_gpio_init(void)
 357 {
 358         if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver))
 359                 printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
 360
 361         if (platform_driver_register(&mpc52xx_simple_gpiochip_driver))
 362                 printk(KERN_ERR "Unable to register simple GPIO driver\n");
 363
 364         return 0;
 365 }
 366
 367
 368 /* Make sure we get initialised before anyone else tries to use us */
 369 subsys_initcall(mpc52xx_gpio_init);
 370
 371 /* No exit call at the moment as we cannot unregister of gpio chips */
 372
 373 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
 374 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
 375 MODULE_LICENSE("GPL v2");
 376