drivers/gpio/gpio-mpc5200.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * MPC52xx gpio driver
   4  *
   5  * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   6  */
   7
   8 #include <linux/of.h>
   9 #include <linux/kernel.h>
  10 #include <linux/slab.h>
  11 #include <linux/gpio/legacy-of-mm-gpiochip.h>
  12 #include <linux/io.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/module.h>
  15
  16 #include <asm/mpc52xx.h>
  17 #include <sysdev/fsl_soc.h>
  18
  19 static DEFINE_SPINLOCK(gpio_lock);
  20
  21 struct mpc52xx_gpiochip {
  22         struct of_mm_gpio_chip mmchip;
  23         unsigned int shadow_dvo;
  24         unsigned int shadow_gpioe;
  25         unsigned int shadow_ddr;
  26 };
  27
  28 /*
  29  * GPIO LIB API implementation for wakeup GPIOs.
  30  *
  31  * There's a maximum of 8 wakeup GPIOs. Which of these are available
  32  * for use depends on your board setup.
  33  *
  34  * 0 -> GPIO_WKUP_7
  35  * 1 -> GPIO_WKUP_6
  36  * 2 -> PSC6_1
  37  * 3 -> PSC6_0
  38  * 4 -> ETH_17
  39  * 5 -> PSC3_9
  40  * 6 -> PSC2_4
  41  * 7 -> PSC1_4
  42  *
  43  */
  44 static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
  45 {
  46         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
  47         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
  48         unsigned int ret;
  49
  50         ret = (in_8(&regs->wkup_ival) >> (7 - gpio)) & 1;
  51
  52         pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
  53
  54         return ret;
  55 }
  56
  57 static inline void
  58 __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
  59 {
  60         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
  61         struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
  62         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
  63
  64         if (val)
  65                 chip->shadow_dvo |= 1 << (7 - gpio);
  66         else
  67                 chip->shadow_dvo &= ~(1 << (7 - gpio));
  68
  69         out_8(&regs->wkup_dvo, chip->shadow_dvo);
  70 }
  71
  72 static void
  73 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
  74 {
  75         unsigned long flags;
  76
  77         spin_lock_irqsave(&gpio_lock, flags);
  78
  79         __mpc52xx_wkup_gpio_set(gc, gpio, val);
  80
  81         spin_unlock_irqrestore(&gpio_lock, flags);
  82
  83         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
  84 }
  85
  86 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
  87 {
  88         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
  89         struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
  90         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
  91         unsigned long flags;
  92
  93         spin_lock_irqsave(&gpio_lock, flags);
  94
  95         /* set the direction */
  96         chip->shadow_ddr &= ~(1 << (7 - gpio));
  97         out_8(&regs->wkup_ddr, chip->shadow_ddr);
  98
  99         /* and enable the pin */
 100         chip->shadow_gpioe |= 1 << (7 - gpio);
 101         out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
 102
 103         spin_unlock_irqrestore(&gpio_lock, flags);
 104
 105         return 0;
 106 }
 107
 108 static int
 109 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 110 {
 111         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 112         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
 113         struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
 114         unsigned long flags;
 115
 116         spin_lock_irqsave(&gpio_lock, flags);
 117
 118         __mpc52xx_wkup_gpio_set(gc, gpio, val);
 119
 120         /* Then set direction */
 121         chip->shadow_ddr |= 1 << (7 - gpio);
 122         out_8(&regs->wkup_ddr, chip->shadow_ddr);
 123
 124         /* Finally enable the pin */
 125         chip->shadow_gpioe |= 1 << (7 - gpio);
 126         out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
 127
 128         spin_unlock_irqrestore(&gpio_lock, flags);
 129
 130         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 131
 132         return 0;
 133 }
 134
 135 static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
 136 {
 137         struct mpc52xx_gpiochip *chip;
 138         struct mpc52xx_gpio_wkup __iomem *regs;
 139         struct gpio_chip *gc;
 140         int ret;
 141
 142         chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
 143         if (!chip)
 144                 return -ENOMEM;
 145
 146         platform_set_drvdata(ofdev, chip);
 147
 148         gc = &chip->mmchip.gc;
 149
 150         gc->ngpio            = 8;
 151         gc->direction_input  = mpc52xx_wkup_gpio_dir_in;
 152         gc->direction_output = mpc52xx_wkup_gpio_dir_out;
 153         gc->get              = mpc52xx_wkup_gpio_get;
 154         gc->set              = mpc52xx_wkup_gpio_set;
 155
 156         ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
 157         if (ret)
 158                 return ret;
 159
 160         regs = chip->mmchip.regs;
 161         chip->shadow_gpioe = in_8(&regs->wkup_gpioe);
 162         chip->shadow_ddr = in_8(&regs->wkup_ddr);
 163         chip->shadow_dvo = in_8(&regs->wkup_dvo);
 164
 165         return 0;
 166 }
 167
 168 static void mpc52xx_gpiochip_remove(struct platform_device *ofdev)
 169 {
 170         struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev);
 171
 172         of_mm_gpiochip_remove(&chip->mmchip);
 173 }
 174
 175 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
 176         { .compatible = "fsl,mpc5200-gpio-wkup", },
 177         {}
 178 };
 179
 180 static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
 181         .driver = {
 182                 .name = "mpc5200-gpio-wkup",
 183                 .of_match_table = mpc52xx_wkup_gpiochip_match,
 184         },
 185         .probe = mpc52xx_wkup_gpiochip_probe,
 186         .remove = mpc52xx_gpiochip_remove,
 187 };
 188
 189 /*
 190  * GPIO LIB API implementation for simple GPIOs
 191  *
 192  * There's a maximum of 32 simple GPIOs. Which of these are available
 193  * for use depends on your board setup.
 194  * The numbering reflects the bit numbering in the port registers:
 195  *
 196  *  0..1  > reserved
 197  *  2..3  > IRDA
 198  *  4..7  > ETHR
 199  *  8..11 > reserved
 200  * 12..15 > USB
 201  * 16..17 > reserved
 202  * 18..23 > PSC3
 203  * 24..27 > PSC2
 204  * 28..31 > PSC1
 205  */
 206 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
 207 {
 208         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 209         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 210         unsigned int ret;
 211
 212         ret = (in_be32(&regs->simple_ival) >> (31 - gpio)) & 1;
 213
 214         return ret;
 215 }
 216
 217 static inline void
 218 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 219 {
 220         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 221         struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
 222         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 223
 224         if (val)
 225                 chip->shadow_dvo |= 1 << (31 - gpio);
 226         else
 227                 chip->shadow_dvo &= ~(1 << (31 - gpio));
 228         out_be32(&regs->simple_dvo, chip->shadow_dvo);
 229 }
 230
 231 static void
 232 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 233 {
 234         unsigned long flags;
 235
 236         spin_lock_irqsave(&gpio_lock, flags);
 237
 238         __mpc52xx_simple_gpio_set(gc, gpio, val);
 239
 240         spin_unlock_irqrestore(&gpio_lock, flags);
 241
 242         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 243 }
 244
 245 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 246 {
 247         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 248         struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
 249         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 250         unsigned long flags;
 251
 252         spin_lock_irqsave(&gpio_lock, flags);
 253
 254         /* set the direction */
 255         chip->shadow_ddr &= ~(1 << (31 - gpio));
 256         out_be32(&regs->simple_ddr, chip->shadow_ddr);
 257
 258         /* and enable the pin */
 259         chip->shadow_gpioe |= 1 << (31 - gpio);
 260         out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
 261
 262         spin_unlock_irqrestore(&gpio_lock, flags);
 263
 264         return 0;
 265 }
 266
 267 static int
 268 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 269 {
 270         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 271         struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
 272         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 273         unsigned long flags;
 274
 275         spin_lock_irqsave(&gpio_lock, flags);
 276
 277         /* First set initial value */
 278         __mpc52xx_simple_gpio_set(gc, gpio, val);
 279
 280         /* Then set direction */
 281         chip->shadow_ddr |= 1 << (31 - gpio);
 282         out_be32(&regs->simple_ddr, chip->shadow_ddr);
 283
 284         /* Finally enable the pin */
 285         chip->shadow_gpioe |= 1 << (31 - gpio);
 286         out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
 287
 288         spin_unlock_irqrestore(&gpio_lock, flags);
 289
 290         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 291
 292         return 0;
 293 }
 294
 295 static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
 296 {
 297         struct mpc52xx_gpiochip *chip;
 298         struct gpio_chip *gc;
 299         struct mpc52xx_gpio __iomem *regs;
 300         int ret;
 301
 302         chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
 303         if (!chip)
 304                 return -ENOMEM;
 305
 306         platform_set_drvdata(ofdev, chip);
 307
 308         gc = &chip->mmchip.gc;
 309
 310         gc->ngpio            = 32;
 311         gc->direction_input  = mpc52xx_simple_gpio_dir_in;
 312         gc->direction_output = mpc52xx_simple_gpio_dir_out;
 313         gc->get              = mpc52xx_simple_gpio_get;
 314         gc->set              = mpc52xx_simple_gpio_set;
 315
 316         ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
 317         if (ret)
 318                 return ret;
 319
 320         regs = chip->mmchip.regs;
 321         chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
 322         chip->shadow_ddr = in_be32(&regs->simple_ddr);
 323         chip->shadow_dvo = in_be32(&regs->simple_dvo);
 324
 325         return 0;
 326 }
 327
 328 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
 329         { .compatible = "fsl,mpc5200-gpio", },
 330         {}
 331 };
 332
 333 static struct platform_driver mpc52xx_simple_gpiochip_driver = {
 334         .driver = {
 335                 .name = "mpc5200-gpio",
 336                 .of_match_table = mpc52xx_simple_gpiochip_match,
 337         },
 338         .probe = mpc52xx_simple_gpiochip_probe,
 339         .remove = mpc52xx_gpiochip_remove,
 340 };
 341
 342 static struct platform_driver * const drivers[] = {
 343         &mpc52xx_wkup_gpiochip_driver,
 344         &mpc52xx_simple_gpiochip_driver,
 345 };
 346
 347 static int __init mpc52xx_gpio_init(void)
 348 {
 349         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 350 }
 351
 352 /* Make sure we get initialised before anyone else tries to use us */
 353 subsys_initcall(mpc52xx_gpio_init);
 354
 355 static void __exit mpc52xx_gpio_exit(void)
 356 {
 357         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 358 }
 359 module_exit(mpc52xx_gpio_exit);
 360
 361 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
 362 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
 363 MODULE_LICENSE("GPL v2");
 364