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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016, NVIDIA CORPORATION.
*/
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <reset-uclass.h>
#include <asm/io.h>
#include <asm/reset.h>
#include <linux/delay.h>
#define SANDBOX_RESET_SIGNALS 101
struct sandbox_reset_signal {
bool asserted;
bool requested;
int reset_count;
};
struct sandbox_reset {
struct sandbox_reset_signal signals[SANDBOX_RESET_SIGNALS];
};
static int sandbox_reset_request(struct reset_ctl *reset_ctl)
{
struct sandbox_reset *sbr = dev_get_priv(reset_ctl->dev);
debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
if (reset_ctl->id >= SANDBOX_RESET_SIGNALS)
return -EINVAL;
sbr->signals[reset_ctl->id].requested = true;
sbr->signals[reset_ctl->id].reset_count = 0;
return 0;
}
static int sandbox_reset_free(struct reset_ctl *reset_ctl)
{
struct sandbox_reset *sbr = dev_get_priv(reset_ctl->dev);
debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
sbr->signals[reset_ctl->id].requested = false;
return 0;
}
static int sandbox_reset_assert(struct reset_ctl *reset_ctl)
{
struct sandbox_reset *sbr = dev_get_priv(reset_ctl->dev);
debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
sbr->signals[reset_ctl->id].asserted = true;
return 0;
}
static int sandbox_reset_deassert(struct reset_ctl *reset_ctl)
{
struct sandbox_reset *sbr = dev_get_priv(reset_ctl->dev);
debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
sbr->signals[reset_ctl->id].asserted = false;
return 0;
}
static int sandbox_reset_reset(struct reset_ctl *reset_ctl, ulong delay_us)
{
struct sandbox_reset *sbr = dev_get_priv(reset_ctl->dev);
debug("%s(reset_ctl=%p, delay_us=%lu)\n", __func__, reset_ctl,
delay_us);
sbr->signals[reset_ctl->id].asserted = true;
udelay(delay_us);
sbr->signals[reset_ctl->id].asserted = false;
sbr->signals[reset_ctl->id].reset_count++;
return 0;
}
static int sandbox_reset_bind(struct udevice *dev)
{
debug("%s(dev=%p)\n", __func__, dev);
return 0;
}
static int sandbox_reset_probe(struct udevice *dev)
{
debug("%s(dev=%p)\n", __func__, dev);
return 0;
}
static const struct udevice_id sandbox_reset_ids[] = {
{ .compatible = "sandbox,reset-ctl" },
{ }
};
static const struct reset_ops sandbox_reset_reset_ops = {
.request = sandbox_reset_request,
.rfree = sandbox_reset_free,
.rst_assert = sandbox_reset_assert,
.rst_deassert = sandbox_reset_deassert,
.rst_reset = sandbox_reset_reset,
};
U_BOOT_DRIVER(sandbox_reset) = {
.name = "sandbox_reset",
.id = UCLASS_RESET,
.of_match = sandbox_reset_ids,
.bind = sandbox_reset_bind,
.probe = sandbox_reset_probe,
.priv_auto = sizeof(struct sandbox_reset),
.ops = &sandbox_reset_reset_ops,
};
/*
* Second sandbox reset controller for tests: same assert/deassert
* behaviour as sandbox_reset, but no rst_reset so reset_reset() uses
* the core assert / udelay / deassert fallback (reset_count never bumps).
*/
static const struct udevice_id sandbox_reset_fallback_ids[] = {
{ .compatible = "sandbox,reset-ctl-fallback-only" },
{ }
};
static const struct reset_ops sandbox_reset_fallback_reset_ops = {
.request = sandbox_reset_request,
.rfree = sandbox_reset_free,
.rst_assert = sandbox_reset_assert,
.rst_deassert = sandbox_reset_deassert,
};
U_BOOT_DRIVER(sandbox_reset_fallback) = {
.name = "sandbox_reset_fallback",
.id = UCLASS_RESET,
.of_match = sandbox_reset_fallback_ids,
.bind = sandbox_reset_bind,
.probe = sandbox_reset_probe,
.priv_auto = sizeof(struct sandbox_reset),
.ops = &sandbox_reset_fallback_reset_ops,
};
int sandbox_reset_query(struct udevice *dev, unsigned long id)
{
struct sandbox_reset *sbr = dev_get_priv(dev);
debug("%s(dev=%p, id=%ld)\n", __func__, dev, id);
if (id >= SANDBOX_RESET_SIGNALS)
return -EINVAL;
return sbr->signals[id].asserted;
}
int sandbox_reset_is_requested(struct udevice *dev, unsigned long id)
{
struct sandbox_reset *sbr = dev_get_priv(dev);
debug("%s(dev=%p, id=%ld)\n", __func__, dev, id);
if (id >= SANDBOX_RESET_SIGNALS)
return -EINVAL;
return sbr->signals[id].requested;
}
int sandbox_reset_get_count(struct udevice *dev, unsigned long id)
{
struct sandbox_reset *sbr = dev_get_priv(dev);
debug("%s(dev=%p, id=%ld)\n", __func__, dev, id);
if (id >= SANDBOX_RESET_SIGNALS)
return -EINVAL;
return sbr->signals[id].reset_count;
}
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