drivers/gpio/bcm6345_gpio.c

   1 /*
   2  * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
   3  *
   4  * Derived from linux/arch/mips/bcm63xx/gpio.c:
   5  *      Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
   6  *      Copyright (C) 2008-2011 Florian Fainelli <florian@openwrt.org>
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <dm.h>
  13 #include <errno.h>
  14 #include <asm/gpio.h>
  15 #include <asm/io.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 struct bcm6345_gpio_priv {
  20         void __iomem *reg_dirout;
  21         void __iomem *reg_data;
  22 };
  23
  24 static int bcm6345_gpio_get_value(struct udevice *dev, unsigned offset)
  25 {
  26         struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  27
  28         return !!(readl_be(priv->reg_data) & BIT(offset));
  29 }
  30
  31 static int bcm6345_gpio_set_value(struct udevice *dev, unsigned offset,
  32                                   int value)
  33 {
  34         struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  35
  36         if (value)
  37                 setbits_be32(priv->reg_data, BIT(offset));
  38         else
  39                 clrbits_be32(priv->reg_data, BIT(offset));
  40
  41         return 0;
  42 }
  43
  44 static int bcm6345_gpio_set_direction(void __iomem *dirout, unsigned offset,
  45                                       bool input)
  46 {
  47         if (input)
  48                 clrbits_be32(dirout, BIT(offset));
  49         else
  50                 setbits_be32(dirout, BIT(offset));
  51
  52         return 0;
  53 }
  54
  55 static int bcm6345_gpio_direction_input(struct udevice *dev, unsigned offset)
  56 {
  57         struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  58
  59         return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 1);
  60 }
  61
  62 static int bcm6345_gpio_direction_output(struct udevice *dev, unsigned offset,
  63                                          int value)
  64 {
  65         struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  66
  67         bcm6345_gpio_set_value(dev, offset, value);
  68
  69         return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 0);
  70 }
  71
  72 static int bcm6345_gpio_get_function(struct udevice *dev, unsigned offset)
  73 {
  74         struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  75
  76         if (readl_be(priv->reg_dirout) & BIT(offset))
  77                 return GPIOF_OUTPUT;
  78         else
  79                 return GPIOF_INPUT;
  80 }
  81
  82 static const struct dm_gpio_ops bcm6345_gpio_ops = {
  83         .direction_input = bcm6345_gpio_direction_input,
  84         .direction_output = bcm6345_gpio_direction_output,
  85         .get_value = bcm6345_gpio_get_value,
  86         .set_value = bcm6345_gpio_set_value,
  87         .get_function = bcm6345_gpio_get_function,
  88 };
  89
  90 static int bcm6345_gpio_probe(struct udevice *dev)
  91 {
  92         struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
  93         struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  94         fdt_addr_t data_addr, dirout_addr;
  95         fdt_size_t data_size, dirout_size;
  96
  97         dirout_addr = devfdt_get_addr_size_index(dev, 0, &dirout_size);
  98         if (dirout_addr == FDT_ADDR_T_NONE)
  99                 return -EINVAL;
 100
 101         data_addr = devfdt_get_addr_size_index(dev, 1, &data_size);
 102         if (data_addr == FDT_ADDR_T_NONE)
 103                 return -EINVAL;
 104
 105         priv->reg_data = ioremap(data_addr, data_size);
 106         priv->reg_dirout = ioremap(dirout_addr, dirout_size);
 107
 108         uc_priv->gpio_count = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
 109                                               "ngpios", 32);
 110         uc_priv->bank_name = dev->name;
 111
 112         return 0;
 113 }
 114
 115 static const struct udevice_id bcm6345_gpio_ids[] = {
 116         { .compatible = "brcm,bcm6345-gpio" },
 117         { /* sentinel */ }
 118 };
 119
 120 U_BOOT_DRIVER(bcm6345_gpio) = {
 121         .name = "bcm6345-gpio",
 122         .id = UCLASS_GPIO,
 123         .of_match = bcm6345_gpio_ids,
 124         .ops = &bcm6345_gpio_ops,
 125         .priv_auto_alloc_size = sizeof(struct bcm6345_gpio_priv),
 126         .probe = bcm6345_gpio_probe,
 127 };