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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 <log.h>
#include <malloc.h>
#include <reset-uclass.h>
#include <asm/io.h>
#include <clk/sunxi.h>
#include <linux/bitops.h>
#include <linux/log2.h>
static const struct ccu_reset *plat_to_reset(struct ccu_plat *plat,
unsigned long id)
{
return &plat->desc->resets[id];
}
static int sunxi_reset_request(struct reset_ctl *reset_ctl)
{
struct ccu_plat *plat = dev_get_plat(reset_ctl->dev);
debug("%s: (RST#%ld)\n", __func__, reset_ctl->id);
if (reset_ctl->id >= plat->desc->num_resets)
return -EINVAL;
return 0;
}
static int sunxi_set_reset(struct reset_ctl *reset_ctl, bool on)
{
struct ccu_plat *plat = dev_get_plat(reset_ctl->dev);
const struct ccu_reset *reset = plat_to_reset(plat, 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(plat->base + reset->off);
if (on)
reg |= reset->bit;
else
reg &= ~reset->bit;
writel(reg, plat->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,
.rst_assert = sunxi_reset_assert,
.rst_deassert = sunxi_reset_deassert,
};
U_BOOT_DRIVER(sunxi_reset) = {
.name = "sunxi_reset",
.id = UCLASS_RESET,
.ops = &sunxi_reset_ops,
};
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