reset-sunxi.c
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// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
* Copyright (C) 2018 Amarula Solutions.
* Author: Jagan Teki <jagan@amarulasolutions.com>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <reset-uclass.h>
#include <asm/io.h>
#include <dm/lists.h>
#include <linux/log2.h>
#include <asm/arch/ccu.h>
struct sunxi_reset_priv {
void *base;
ulong count;
const struct ccu_desc *desc;
};
static const struct ccu_reset *priv_to_reset(struct sunxi_reset_priv *priv,
unsigned long id)
{
return &priv->desc->resets[id];
}
static int sunxi_reset_request(struct reset_ctl *reset_ctl)
{
struct sunxi_reset_priv *priv = dev_get_priv(reset_ctl->dev);
debug("%s: (RST#%ld)\n", __func__, reset_ctl->id);
if (reset_ctl->id >= priv->count)
return -EINVAL;
return 0;
}
static int sunxi_reset_free(struct reset_ctl *reset_ctl)
{
debug("%s: (RST#%ld)\n", __func__, reset_ctl->id);
return 0;
}
static int sunxi_set_reset(struct reset_ctl *reset_ctl, bool on)
{
struct sunxi_reset_priv *priv = dev_get_priv(reset_ctl->dev);
const struct ccu_reset *reset = priv_to_reset(priv, reset_ctl->id);
u32 reg;
if (!(reset->flags & CCU_RST_F_IS_VALID)) {
printf("%s: (RST#%ld) unhandled\n", __func__, reset_ctl->id);
return 0;
}
debug("%s: (RST#%ld) off#0x%x, BIT(%d)\n", __func__,
reset_ctl->id, reset->off, ilog2(reset->bit));
reg = readl(priv->base + reset->off);
if (on)
reg |= reset->bit;
else
reg &= ~reset->bit;
writel(reg, priv->base + reset->off);
return 0;
}
static int sunxi_reset_assert(struct reset_ctl *reset_ctl)
{
return sunxi_set_reset(reset_ctl, false);
}
static int sunxi_reset_deassert(struct reset_ctl *reset_ctl)
{
return sunxi_set_reset(reset_ctl, true);
}
struct reset_ops sunxi_reset_ops = {
.request = sunxi_reset_request,
.rfree = sunxi_reset_free,
.rst_assert = sunxi_reset_assert,
.rst_deassert = sunxi_reset_deassert,
};
static int sunxi_reset_probe(struct udevice *dev)
{
struct sunxi_reset_priv *priv = dev_get_priv(dev);
priv->base = dev_read_addr_ptr(dev);
return 0;
}
int sunxi_reset_bind(struct udevice *dev, ulong count)
{
struct udevice *rst_dev;
struct sunxi_reset_priv *priv;
int ret;
ret = device_bind_driver_to_node(dev, "sunxi_reset", "reset",
dev_ofnode(dev), &rst_dev);
if (ret) {
debug("failed to bind sunxi_reset driver (ret=%d)\n", ret);
return ret;
}
priv = malloc(sizeof(struct sunxi_reset_priv));
priv->count = count;
priv->desc = (const struct ccu_desc *)dev_get_driver_data(dev);
rst_dev->priv = priv;
return 0;
}
U_BOOT_DRIVER(sunxi_reset) = {
.name = "sunxi_reset",
.id = UCLASS_RESET,
.ops = &sunxi_reset_ops,
.probe = sunxi_reset_probe,
.priv_auto_alloc_size = sizeof(struct sunxi_reset_priv),
};