drivers/gpio/hi6220_gpio.c

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