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                 .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 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                 .of_match_table = mpc52xx_simple_gpiochip_match,
 350         },
 351         .probe = mpc52xx_simple_gpiochip_probe,
 352         .remove = mpc52xx_gpiochip_remove,
 353 };
 354
 355 static int __init mpc52xx_gpio_init(void)
 356 {
 357         if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver))
 358                 printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
 359
 360         if (platform_driver_register(&mpc52xx_simple_gpiochip_driver))
 361                 printk(KERN_ERR "Unable to register simple GPIO driver\n");
 362
 363         return 0;
 364 }
 365
 366
 367 /* Make sure we get initialised before anyone else tries to use us */
 368 subsys_initcall(mpc52xx_gpio_init);
 369
 370 /* No exit call at the moment as we cannot unregister of gpio chips */
 371
 372 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
 373 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
 374 MODULE_LICENSE("GPL v2");
 375