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/*
* Copyright (C) 2017 Theobroma Systems Design und Consulting GmbH
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <reset-uclass.h>
#include <dm/device.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/sizes.h>
#include "ccu_reset.h"
DECLARE_GLOBAL_DATA_PTR;
struct sunxi_reset_priv {
void *base;
size_t size;
};
static int sunxi_reset_request(struct reset_ctl *reset_ctl)
{
debug("%s (%s): id %ld\n",
reset_ctl->dev->name, __func__, reset_ctl->id);
return 0;
}
static int sunxi_reset_free(struct reset_ctl *reset_ctl)
{
debug("%s (%s): id %ld\n",
reset_ctl->dev->name, __func__, reset_ctl->id);
return 0;
}
static int sunxi_reset_update_bit(struct udevice *dev,
const uint32_t off,
const uint32_t bitmask,
const bool assert)
{
const struct sunxi_reset_priv *priv = dev_get_priv(dev);
debug("%s (%s): base %p offset %x bit %x assert %d size %ld\n",
dev->name, __func__,
priv->base, off, bitmask, assert, priv->size);
if (off >= priv->size)
return -EINVAL;
if (assert)
clrbits_le32(priv->base + off, bitmask);
else
setbits_le32(priv->base + off, bitmask);
return 0;
}
static int sunxi_ccu_reset_update(struct reset_ctl *reset_ctl, bool assert)
{
struct udevice *dev = reset_ctl->dev;
const struct ccu_reset_map *reset_map =
(const struct ccu_reset_map *)dev_get_driver_data(dev);
const struct ccu_reset_map *entry = &reset_map[reset_ctl->id];
return sunxi_reset_update_bit(dev, entry->reg, entry->bit, assert);
}
static int sunxi_ccu_reset_assert(struct reset_ctl *reset_ctl)
{
return sunxi_ccu_reset_update(reset_ctl, true);
}
static int sunxi_ccu_reset_deassert(struct reset_ctl *reset_ctl)
{
return sunxi_ccu_reset_update(reset_ctl, false);
}
static int sunxi_reset_update(struct reset_ctl *reset_ctl, bool assert)
{
struct udevice *dev = reset_ctl->dev;
const unsigned long id = reset_ctl->id;
const unsigned long offset = (id / 32) * sizeof(uint32_t);
const unsigned int bit = id % 32;
return sunxi_reset_update_bit(dev, offset, BIT(bit), assert);
}
static int sunxi_reset_assert(struct reset_ctl *reset_ctl)
{
return sunxi_reset_update(reset_ctl, true);
}
static int sunxi_reset_deassert(struct reset_ctl *reset_ctl)
{
return sunxi_reset_update(reset_ctl, false);
}
static int sunxi_reset_probe(struct udevice *dev)
{
struct sunxi_reset_priv *priv = dev_get_priv(dev);
fdt_addr_t addr;
fdt_size_t size;
addr = fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, dev->of_offset,
"reg", 0, &size, false);
if (addr == FDT_ADDR_T_NONE) {
debug("%s: failed to find base address ('reg')\n", dev->name);
return -ENODEV;
}
priv->base = (void *)addr;
priv->size = size;
if (!priv->base)
return -ENOMEM;
return 0;
}
static const struct reset_ops sunxi_reset_ops = {
.request = sunxi_reset_request,
.free = sunxi_reset_free,
.rst_assert = sunxi_reset_assert,
.rst_deassert = sunxi_reset_deassert,
};
static const struct udevice_id sunxi_reset_match[] = {
{ .compatible = "allwinner,sun6i-a31-clock-reset" },
{ }
};
U_BOOT_DRIVER(sunxi_reset) = {
.name = "sunxi-reset",
.id = UCLASS_RESET,
.of_match = sunxi_reset_match,
.ops = &sunxi_reset_ops,
.priv_auto_alloc_size = sizeof(struct sunxi_reset_priv),
.probe = sunxi_reset_probe,
};
static const struct reset_ops sunxi_ccu_reset_ops = {
.request = sunxi_reset_request,
.free = sunxi_reset_free,
.rst_assert = sunxi_ccu_reset_assert,
.rst_deassert = sunxi_ccu_reset_deassert,
};
#if defined(CONFIG_MACH_SUN50I)
extern const struct ccu_reset_map sun50i_a64_ccu_resets;
#endif
static const struct udevice_id sunxi_ccu_reset_match[] = {
#if defined(CONFIG_MACH_SUN50I)
{ .compatible = "allwinner,sun50i-a64-ccu",
.data = (ulong)&sun50i_a64_ccu_resets },
#endif
{ }
};
U_BOOT_DRIVER(sunxi_ccu_reset) = {
.name = "sunxi-ccu-reset",
.id = UCLASS_RESET,
.of_match = sunxi_ccu_reset_match,
.ops = &sunxi_ccu_reset_ops,
.priv_auto_alloc_size = sizeof(struct sunxi_reset_priv),
.probe = sunxi_reset_probe,
};
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