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 = container_of(mm_gc,
  75                         struct mpc52xx_gpiochip, mmchip);
  76         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
  77
  78         if (val)
  79                 chip->shadow_dvo |= 1 << (7 - gpio);
  80         else
  81                 chip->shadow_dvo &= ~(1 << (7 - gpio));
  82
  83         out_8(&regs->wkup_dvo, chip->shadow_dvo);
  84 }
  85
  86 static void
  87 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
  88 {
  89         unsigned long flags;
  90
  91         spin_lock_irqsave(&gpio_lock, flags);
  92
  93         __mpc52xx_wkup_gpio_set(gc, gpio, val);
  94
  95         spin_unlock_irqrestore(&gpio_lock, flags);
  96
  97         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
  98 }
  99
 100 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 101 {
 102         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 103         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 104                         struct mpc52xx_gpiochip, mmchip);
 105         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
 106         unsigned long flags;
 107
 108         spin_lock_irqsave(&gpio_lock, flags);
 109
 110         /* set the direction */
 111         chip->shadow_ddr &= ~(1 << (7 - gpio));
 112         out_8(&regs->wkup_ddr, chip->shadow_ddr);
 113
 114         /* and enable the pin */
 115         chip->shadow_gpioe |= 1 << (7 - gpio);
 116         out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
 117
 118         spin_unlock_irqrestore(&gpio_lock, flags);
 119
 120         return 0;
 121 }
 122
 123 static int
 124 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 125 {
 126         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 127         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
 128         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 129                         struct mpc52xx_gpiochip, mmchip);
 130         unsigned long flags;
 131
 132         spin_lock_irqsave(&gpio_lock, flags);
 133
 134         __mpc52xx_wkup_gpio_set(gc, gpio, val);
 135
 136         /* Then set direction */
 137         chip->shadow_ddr |= 1 << (7 - gpio);
 138         out_8(&regs->wkup_ddr, chip->shadow_ddr);
 139
 140         /* Finally enable the pin */
 141         chip->shadow_gpioe |= 1 << (7 - gpio);
 142         out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
 143
 144         spin_unlock_irqrestore(&gpio_lock, flags);
 145
 146         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 147
 148         return 0;
 149 }
 150
 151 static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
 152 {
 153         struct mpc52xx_gpiochip *chip;
 154         struct mpc52xx_gpio_wkup __iomem *regs;
 155         struct gpio_chip *gc;
 156         int ret;
 157
 158         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 159         if (!chip)
 160                 return -ENOMEM;
 161
 162         gc = &chip->mmchip.gc;
 163
 164         gc->ngpio            = 8;
 165         gc->direction_input  = mpc52xx_wkup_gpio_dir_in;
 166         gc->direction_output = mpc52xx_wkup_gpio_dir_out;
 167         gc->get              = mpc52xx_wkup_gpio_get;
 168         gc->set              = mpc52xx_wkup_gpio_set;
 169
 170         ret = of_mm_gpiochip_add(ofdev->dev.of_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 platform_device *ofdev)
 183 {
 184         return -EBUSY;
 185 }
 186
 187 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
 188         { .compatible = "fsl,mpc5200-gpio-wkup", },
 189         {}
 190 };
 191
 192 static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
 193         .driver = {
 194                 .name = "mpc5200-gpio-wkup",
 195                 .owner = THIS_MODULE,
 196                 .of_match_table = mpc52xx_wkup_gpiochip_match,
 197         },
 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 mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
 312 {
 313         struct mpc52xx_gpiochip *chip;
 314         struct gpio_chip *gc;
 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         gc = &chip->mmchip.gc;
 323
 324         gc->ngpio            = 32;
 325         gc->direction_input  = mpc52xx_simple_gpio_dir_in;
 326         gc->direction_output = mpc52xx_simple_gpio_dir_out;
 327         gc->get              = mpc52xx_simple_gpio_get;
 328         gc->set              = mpc52xx_simple_gpio_set;
 329
 330         ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
 331         if (ret)
 332                 return ret;
 333
 334         regs = chip->mmchip.regs;
 335         chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
 336         chip->shadow_ddr = in_be32(&regs->simple_ddr);
 337         chip->shadow_dvo = in_be32(&regs->simple_dvo);
 338
 339         return 0;
 340 }
 341
 342 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
 343         { .compatible = "fsl,mpc5200-gpio", },
 344         {}
 345 };
 346
 347 static struct platform_driver mpc52xx_simple_gpiochip_driver = {
 348         .driver = {
 349                 .name = "mpc5200-gpio",
 350                 .owner = THIS_MODULE,
 351                 .of_match_table = mpc52xx_simple_gpiochip_match,
 352         },
 353         .probe = mpc52xx_simple_gpiochip_probe,
 354         .remove = mpc52xx_gpiochip_remove,
 355 };
 356
 357 static int __init mpc52xx_gpio_init(void)
 358 {
 359         if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver))
 360                 printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
 361
 362         if (platform_driver_register(&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