drivers/gpio/rk_gpio.c

   1 /*
   2  * (C) Copyright 2015 Google, Inc
   3  *
   4  * (C) Copyright 2008-2014 Rockchip Electronics
   5  * Peter, Software Engineering, <superpeter.cai@gmail.com>.
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <asm/errno.h>
  13 #include <asm/gpio.h>
  14 #include <asm/io.h>
  15 #include <dt-bindings/gpio/gpio.h>
  16
  17 enum {
  18         ROCKCHIP_GPIOS_PER_BANK         = 32,
  19 };
  20
  21 #define OFFSET_TO_BIT(bit)      (1UL << (bit))
  22
  23 struct rockchip_gpio_priv {
  24         struct rockchip_gpio_regs *regs;
  25         char name[2];
  26 };
  27
  28 static int rockchip_gpio_direction_input(struct udevice *dev, unsigned offset)
  29 {
  30         struct rockchip_gpio_priv *priv = dev_get_priv(dev);
  31         struct rockchip_gpio_regs *regs = priv->regs;
  32
  33         clrbits_le32(&regs->swport_ddr, OFFSET_TO_BIT(offset));
  34
  35         return 0;
  36 }
  37
  38 static int rockchip_gpio_direction_output(struct udevice *dev, unsigned offset,
  39                                           int value)
  40 {
  41         struct rockchip_gpio_priv *priv = dev_get_priv(dev);
  42         struct rockchip_gpio_regs *regs = priv->regs;
  43         int mask = OFFSET_TO_BIT(offset);
  44
  45         clrsetbits_le32(&regs->swport_dr, mask, value ? mask : 0);
  46         setbits_le32(&regs->swport_ddr, mask);
  47
  48         return 0;
  49 }
  50
  51 static int rockchip_gpio_get_value(struct udevice *dev, unsigned offset)
  52 {
  53         struct rockchip_gpio_priv *priv = dev_get_priv(dev);
  54         struct rockchip_gpio_regs *regs = priv->regs;
  55
  56         return readl(&regs->ext_port) & OFFSET_TO_BIT(offset);
  57 }
  58
  59 static int rockchip_gpio_set_value(struct udevice *dev, unsigned offset,
  60                                    int value)
  61 {
  62         struct rockchip_gpio_priv *priv = dev_get_priv(dev);
  63         struct rockchip_gpio_regs *regs = priv->regs;
  64         int mask = OFFSET_TO_BIT(offset);
  65
  66         clrsetbits_le32(&regs->swport_dr, mask, value ? mask : 0);
  67
  68         return 0;
  69 }
  70
  71 static int rockchip_gpio_get_function(struct udevice *dev, unsigned offset)
  72 {
  73         return -ENOSYS;
  74 }
  75
  76 static int rockchip_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
  77                             struct fdtdec_phandle_args *args)
  78 {
  79         desc->offset = args->args[0];
  80         desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
  81
  82         return 0;
  83 }
  84
  85 static int rockchip_gpio_probe(struct udevice *dev)
  86 {
  87         struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
  88         struct rockchip_gpio_priv *priv = dev_get_priv(dev);
  89         char *end;
  90         int bank;
  91
  92         priv->regs = (struct rockchip_gpio_regs *)dev_get_addr(dev);
  93         uc_priv->gpio_count = ROCKCHIP_GPIOS_PER_BANK;
  94         end = strrchr(dev->name, '@');
  95         bank = trailing_strtoln(dev->name, end);
  96         priv->name[0] = 'A' + bank;
  97         uc_priv->bank_name = priv->name;
  98
  99         return 0;
 100 }
 101
 102 static const struct dm_gpio_ops gpio_rockchip_ops = {
 103         .direction_input        = rockchip_gpio_direction_input,
 104         .direction_output       = rockchip_gpio_direction_output,
 105         .get_value              = rockchip_gpio_get_value,
 106         .set_value              = rockchip_gpio_set_value,
 107         .get_function           = rockchip_gpio_get_function,
 108         .xlate                  = rockchip_gpio_xlate,
 109 };
 110
 111 static const struct udevice_id rockchip_gpio_ids[] = {
 112         { .compatible = "rockchip,gpio-bank" },
 113         { }
 114 };
 115
 116 U_BOOT_DRIVER(gpio_rockchip) = {
 117         .name   = "gpio_rockchip",
 118         .id     = UCLASS_GPIO,
 119         .of_match = rockchip_gpio_ids,
 120         .ops    = &gpio_rockchip_ops,
 121         .priv_auto_alloc_size = sizeof(struct rockchip_gpio_priv),
 122         .probe  = rockchip_gpio_probe,
 123 };