LXR uboot/drivers/gpio/bcm6345

   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
  16struct bcm6345_gpio_priv {
  17        void __iomem *reg_dirout;
  18        void __iomem *reg_data;
  19};
  20
  21static int bcm6345_gpio_get_value(struct udevice *dev, unsigned offset)
  22{
  23        struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  24
  25        return !!(readl_be(priv->reg_data) & BIT(offset));
  26}
  27
  28static int bcm6345_gpio_set_value(struct udevice *dev, unsigned offset,
  29                                  int value)
  30{
  31        struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  32
  33        if (value)
  34                setbits_be32(priv->reg_data, BIT(offset));
  35        else
  36                clrbits_be32(priv->reg_data, BIT(offset));
  37
  38        return 0;
  39}
  40
  41static int bcm6345_gpio_set_direction(void __iomem *dirout, unsigned offset,
  42                                      bool input)
  43{
  44        if (input)
  45                clrbits_be32(dirout, BIT(offset));
  46        else
  47                setbits_be32(dirout, BIT(offset));
  48
  49        return 0;
  50}
  51
  52static int bcm6345_gpio_direction_input(struct udevice *dev, unsigned offset)
  53{
  54        struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  55
  56        return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 1);
  57}
  58
  59static int bcm6345_gpio_direction_output(struct udevice *dev, unsigned offset,
  60                                         int value)
  61{
  62        struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  63
  64        bcm6345_gpio_set_value(dev, offset, value);
  65
  66        return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 0);
  67}
  68
  69static int bcm6345_gpio_get_function(struct udevice *dev, unsigned offset)
  70{
  71        struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  72
  73        if (readl_be(priv->reg_dirout) & BIT(offset))
  74                return GPIOF_OUTPUT;
  75        else
  76                return GPIOF_INPUT;
  77}
  78
  79static const struct dm_gpio_ops bcm6345_gpio_ops = {
  80        .direction_input = bcm6345_gpio_direction_input,
  81        .direction_output = bcm6345_gpio_direction_output,
  82        .get_value = bcm6345_gpio_get_value,
  83        .set_value = bcm6345_gpio_set_value,
  84        .get_function = bcm6345_gpio_get_function,
  85};
  86
  87static int bcm6345_gpio_probe(struct udevice *dev)
  88{
  89        struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
  90        struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
  91
  92        priv->reg_dirout = dev_remap_addr_index(dev, 0);
  93        if (!priv->reg_dirout)
  94                return -EINVAL;
  95
  96        priv->reg_data = dev_remap_addr_index(dev, 1);
  97        if (!priv->reg_data)
  98                return -EINVAL;
  99
 100        uc_priv->gpio_count = dev_read_u32_default(dev, "ngpios", 32);
 101        uc_priv->bank_name = dev->name;
 102
 103        return 0;
 104}
 105
 106static const struct udevice_id bcm6345_gpio_ids[] = {
 107        { .compatible = "brcm,bcm6345-gpio" },
 108        { /* sentinel */ }
 109};
 110
 111U_BOOT_DRIVER(bcm6345_gpio) = {
 112        .name = "bcm6345-gpio",
 113        .id = UCLASS_GPIO,
 114        .of_match = bcm6345_gpio_ids,
 115        .ops = &bcm6345_gpio_ops,
 116        .priv_auto_alloc_size = sizeof(struct bcm6345_gpio_priv),
 117        .probe = bcm6345_gpio_probe,
 118};
 119