drivers/gpio/hi6220_gpio.c

   1 /*
   2  * Copyright (C) 2015 Linaro
   3  * Peter Griffin <peter.griffin@linaro.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <asm/gpio.h>
  11 #include <asm/io.h>
  12 #include <errno.h>
  13
  14 static int hi6220_gpio_direction_input(struct udevice *dev, unsigned int gpio)
  15 {
  16         struct gpio_bank *bank = dev_get_priv(dev);
  17         u8 data;
  18
  19         data = readb(bank->base + HI6220_GPIO_DIR);
  20         data &= ~(1 << gpio);
  21         writeb(data, bank->base + HI6220_GPIO_DIR);
  22
  23         return 0;
  24 }
  25
  26 static int hi6220_gpio_set_value(struct udevice *dev, unsigned gpio,
  27                                   int value)
  28 {
  29         struct gpio_bank *bank = dev_get_priv(dev);
  30
  31         writeb(!!value << gpio, bank->base + (BIT(gpio + 2)));
  32         return 0;
  33 }
  34
  35 static int hi6220_gpio_direction_output(struct udevice *dev, unsigned gpio,
  36                                         int value)
  37 {
  38         struct gpio_bank *bank = dev_get_priv(dev);
  39         u8 data;
  40
  41         data = readb(bank->base + HI6220_GPIO_DIR);
  42         data |= 1 << gpio;
  43         writeb(data, bank->base + HI6220_GPIO_DIR);
  44
  45         hi6220_gpio_set_value(dev, gpio, value);
  46
  47         return 0;
  48 }
  49
  50 static int hi6220_gpio_get_value(struct udevice *dev, unsigned gpio)
  51 {
  52         struct gpio_bank *bank = dev_get_priv(dev);
  53
  54         return !!readb(bank->base + (BIT(gpio + 2)));
  55 }
  56
  57
  58
  59 static const struct dm_gpio_ops gpio_hi6220_ops = {
  60         .direction_input        = hi6220_gpio_direction_input,
  61         .direction_output       = hi6220_gpio_direction_output,
  62         .get_value              = hi6220_gpio_get_value,
  63         .set_value              = hi6220_gpio_set_value,
  64 };
  65
  66 static int hi6220_gpio_probe(struct udevice *dev)
  67 {
  68         struct gpio_bank *bank = dev_get_priv(dev);
  69         struct hikey_gpio_platdata *plat = dev_get_platdata(dev);
  70         struct gpio_dev_priv *uc_priv = dev->uclass_priv;
  71         char name[18], *str;
  72
  73         sprintf(name, "GPIO%d_", plat->bank_index);
  74
  75         str = strdup(name);
  76         if (!str)
  77                 return -ENOMEM;
  78
  79         uc_priv->bank_name = str;
  80         uc_priv->gpio_count = HI6220_GPIO_PER_BANK;
  81
  82         bank->base = (u8 *)plat->base;
  83
  84         return 0;
  85 }
  86
  87 U_BOOT_DRIVER(gpio_hi6220) = {
  88         .name   = "gpio_hi6220",
  89         .id     = UCLASS_GPIO,
  90         .ops    = &gpio_hi6220_ops,
  91         .probe  = hi6220_gpio_probe,
  92         .priv_auto_alloc_size = sizeof(struct gpio_bank),
  93 };
  94
  95