git.sur5r.net Git - u-boot/blob - drivers/gpio/bcm6345_gpio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
   4  *
   5  * Derived from linux/arch/mips/bcm63xx/gpio.c:
   6  *      Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
   7  *      Copyright (C) 2008-2011 Florian Fainelli <florian@openwrt.org>
   8  */
   9
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <errno.h>
  13 #include <asm/gpio.h>
  14 #include <asm/io.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 struct bcm6345_gpio_priv {
  19         void __iomem *reg_dirout;
  20         void __iomem *reg_data;
  21 };
  22
  23 static int bcm6345_gpio_get_value(struct udevice *dev, unsigned offset)
  24 {
  25         struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  26
  27         return !!(readl_be(priv->reg_data) & BIT(offset));
  28 }
  29
  30 static int bcm6345_gpio_set_value(struct udevice *dev, unsigned offset,
  31                                   int value)
  32 {
  33         struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  34
  35         if (value)
  36                 setbits_be32(priv->reg_data, BIT(offset));
  37         else
  38                 clrbits_be32(priv->reg_data, BIT(offset));
  39
  40         return 0;
  41 }
  42
  43 static int bcm6345_gpio_set_direction(void __iomem *dirout, unsigned offset,
  44                                       bool input)
  45 {
  46         if (input)
  47                 clrbits_be32(dirout, BIT(offset));
  48         else
  49                 setbits_be32(dirout, BIT(offset));
  50
  51         return 0;
  52 }
  53
  54 static int bcm6345_gpio_direction_input(struct udevice *dev, unsigned offset)
  55 {
  56         struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  57
  58         return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 1);
  59 }
  60
  61 static int bcm6345_gpio_direction_output(struct udevice *dev, unsigned offset,
  62                                          int value)
  63 {
  64         struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  65
  66         bcm6345_gpio_set_value(dev, offset, value);
  67
  68         return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 0);
  69 }
  70
  71 static int bcm6345_gpio_get_function(struct udevice *dev, unsigned offset)
  72 {
  73         struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  74
  75         if (readl_be(priv->reg_dirout) & BIT(offset))
  76                 return GPIOF_OUTPUT;
  77         else
  78                 return GPIOF_INPUT;
  79 }
  80
  81 static const struct dm_gpio_ops bcm6345_gpio_ops = {
  82         .direction_input = bcm6345_gpio_direction_input,
  83         .direction_output = bcm6345_gpio_direction_output,
  84         .get_value = bcm6345_gpio_get_value,
  85         .set_value = bcm6345_gpio_set_value,
  86         .get_function = bcm6345_gpio_get_function,
  87 };
  88
  89 static int bcm6345_gpio_probe(struct udevice *dev)
  90 {
  91         struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
  92         struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  93         fdt_addr_t data_addr, dirout_addr;
  94         fdt_size_t data_size, dirout_size;
  95
  96         dirout_addr = devfdt_get_addr_size_index(dev, 0, &dirout_size);
  97         if (dirout_addr == FDT_ADDR_T_NONE)
  98                 return -EINVAL;
  99
 100         data_addr = devfdt_get_addr_size_index(dev, 1, &data_size);
 101         if (data_addr == FDT_ADDR_T_NONE)
 102                 return -EINVAL;
 103
 104         priv->reg_data = ioremap(data_addr, data_size);
 105         priv->reg_dirout = ioremap(dirout_addr, dirout_size);
 106
 107         uc_priv->gpio_count = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
 108                                               "ngpios", 32);
 109         uc_priv->bank_name = dev->name;
 110
 111         return 0;
 112 }
 113
 114 static const struct udevice_id bcm6345_gpio_ids[] = {
 115         { .compatible = "brcm,bcm6345-gpio" },
 116         { /* sentinel */ }
 117 };
 118
 119 U_BOOT_DRIVER(bcm6345_gpio) = {
 120         .name = "bcm6345-gpio",
 121         .id = UCLASS_GPIO,
 122         .of_match = bcm6345_gpio_ids,
 123         .ops = &bcm6345_gpio_ops,
 124         .priv_auto_alloc_size = sizeof(struct bcm6345_gpio_priv),
 125         .probe = bcm6345_gpio_probe,
 126 };