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/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 = gpiochip_get_data(gc);
  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 = gpiochip_get_data(gc);
 102         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
 103         unsigned long flags;
 104
 105         spin_lock_irqsave(&gpio_lock, flags);
 106
 107         /* set the direction */
 108         chip->shadow_ddr &= ~(1 << (7 - gpio));
 109         out_8(&regs->wkup_ddr, chip->shadow_ddr);
 110
 111         /* and enable the pin */
 112         chip->shadow_gpioe |= 1 << (7 - gpio);
 113         out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
 114
 115         spin_unlock_irqrestore(&gpio_lock, flags);
 116
 117         return 0;
 118 }
 119
 120 static int
 121 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 122 {
 123         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 124         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
 125         struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
 126         unsigned long flags;
 127
 128         spin_lock_irqsave(&gpio_lock, flags);
 129
 130         __mpc52xx_wkup_gpio_set(gc, gpio, val);
 131
 132         /* Then set direction */
 133         chip->shadow_ddr |= 1 << (7 - gpio);
 134         out_8(&regs->wkup_ddr, chip->shadow_ddr);
 135
 136         /* Finally enable the pin */
 137         chip->shadow_gpioe |= 1 << (7 - gpio);
 138         out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
 139
 140         spin_unlock_irqrestore(&gpio_lock, flags);
 141
 142         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 143
 144         return 0;
 145 }
 146
 147 static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
 148 {
 149         struct mpc52xx_gpiochip *chip;
 150         struct mpc52xx_gpio_wkup __iomem *regs;
 151         struct gpio_chip *gc;
 152         int ret;
 153
 154         chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
 155         if (!chip)
 156                 return -ENOMEM;
 157
 158         platform_set_drvdata(ofdev, chip);
 159
 160         gc = &chip->mmchip.gc;
 161
 162         gc->ngpio            = 8;
 163         gc->direction_input  = mpc52xx_wkup_gpio_dir_in;
 164         gc->direction_output = mpc52xx_wkup_gpio_dir_out;
 165         gc->get              = mpc52xx_wkup_gpio_get;
 166         gc->set              = mpc52xx_wkup_gpio_set;
 167
 168         ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
 169         if (ret)
 170                 return ret;
 171
 172         regs = chip->mmchip.regs;
 173         chip->shadow_gpioe = in_8(&regs->wkup_gpioe);
 174         chip->shadow_ddr = in_8(&regs->wkup_ddr);
 175         chip->shadow_dvo = in_8(&regs->wkup_dvo);
 176
 177         return 0;
 178 }
 179
 180 static int mpc52xx_gpiochip_remove(struct platform_device *ofdev)
 181 {
 182         struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev);
 183
 184         of_mm_gpiochip_remove(&chip->mmchip);
 185
 186         return 0;
 187 }
 188
 189 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
 190         { .compatible = "fsl,mpc5200-gpio-wkup", },
 191         {}
 192 };
 193
 194 static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
 195         .driver = {
 196                 .name = "mpc5200-gpio-wkup",
 197                 .of_match_table = mpc52xx_wkup_gpiochip_match,
 198         },
 199         .probe = mpc52xx_wkup_gpiochip_probe,
 200         .remove = mpc52xx_gpiochip_remove,
 201 };
 202
 203 /*
 204  * GPIO LIB API implementation for simple GPIOs
 205  *
 206  * There's a maximum of 32 simple GPIOs. Which of these are available
 207  * for use depends on your board setup.
 208  * The numbering reflects the bit numbering in the port registers:
 209  *
 210  *  0..1  > reserved
 211  *  2..3  > IRDA
 212  *  4..7  > ETHR
 213  *  8..11 > reserved
 214  * 12..15 > USB
 215  * 16..17 > reserved
 216  * 18..23 > PSC3
 217  * 24..27 > PSC2
 218  * 28..31 > PSC1
 219  */
 220 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
 221 {
 222         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 223         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 224         unsigned int ret;
 225
 226         ret = (in_be32(&regs->simple_ival) >> (31 - gpio)) & 1;
 227
 228         return ret;
 229 }
 230
 231 static inline void
 232 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 233 {
 234         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 235         struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
 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 = gpiochip_get_data(gc);
 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 = gpiochip_get_data(gc);
 286         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 287         unsigned long flags;
 288
 289         spin_lock_irqsave(&gpio_lock, flags);
 290
 291         /* First set initial value */
 292         __mpc52xx_simple_gpio_set(gc, gpio, val);
 293
 294         /* Then set direction */
 295         chip->shadow_ddr |= 1 << (31 - gpio);
 296         out_be32(&regs->simple_ddr, chip->shadow_ddr);
 297
 298         /* Finally enable the pin */
 299         chip->shadow_gpioe |= 1 << (31 - gpio);
 300         out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
 301
 302         spin_unlock_irqrestore(&gpio_lock, flags);
 303
 304         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 305
 306         return 0;
 307 }
 308
 309 static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
 310 {
 311         struct mpc52xx_gpiochip *chip;
 312         struct gpio_chip *gc;
 313         struct mpc52xx_gpio __iomem *regs;
 314         int ret;
 315
 316         chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
 317         if (!chip)
 318                 return -ENOMEM;
 319
 320         platform_set_drvdata(ofdev, chip);
 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_data(ofdev->dev.of_node, &chip->mmchip, chip);
 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                 .of_match_table = mpc52xx_simple_gpiochip_match,
 351         },
 352         .probe = mpc52xx_simple_gpiochip_probe,
 353         .remove = mpc52xx_gpiochip_remove,
 354 };
 355
 356 static struct platform_driver * const drivers[] = {
 357         &mpc52xx_wkup_gpiochip_driver,
 358         &mpc52xx_simple_gpiochip_driver,
 359 };
 360
 361 static int __init mpc52xx_gpio_init(void)
 362 {
 363         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 364 }
 365
 366 /* Make sure we get initialised before anyone else tries to use us */
 367 subsys_initcall(mpc52xx_gpio_init);
 368
 369 static void __exit mpc52xx_gpio_exit(void)
 370 {
 371         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 372 }
 373 module_exit(mpc52xx_gpio_exit);
 374
 375 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
 376 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
 377 MODULE_LICENSE("GPL v2");
 378