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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 Xilinx, Inc. - Michal Simek
*/
#define LOG_CATEGORY UCLASS_RESET
#include <common.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <reset-uclass.h>
#include <zynqmp_firmware.h>
#define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
#define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START
struct zynqmp_reset_priv {
u32 reset_id;
u32 nr_reset;
};
static int zynqmp_pm_reset_assert(const u32 reset,
const enum zynqmp_pm_reset_action assert_flag)
{
return xilinx_pm_request(PM_RESET_ASSERT, reset, assert_flag, 0, 0,
NULL);
}
static int zynqmp_reset_assert(struct reset_ctl *rst)
{
struct zynqmp_reset_priv *priv = dev_get_priv(rst->dev);
dev_dbg(rst->dev, "%s(rst=%p) (id=%lu)\n", __func__, rst, rst->id);
return zynqmp_pm_reset_assert(priv->reset_id + rst->id,
PM_RESET_ACTION_ASSERT);
}
static int zynqmp_reset_deassert(struct reset_ctl *rst)
{
struct zynqmp_reset_priv *priv = dev_get_priv(rst->dev);
dev_dbg(rst->dev, "%s(rst=%p) (id=%lu)\n", __func__, rst, rst->id);
return zynqmp_pm_reset_assert(priv->reset_id + rst->id,
PM_RESET_ACTION_RELEASE);
}
static int zynqmp_reset_request(struct reset_ctl *rst)
{
struct zynqmp_reset_priv *priv = dev_get_priv(rst->dev);
dev_dbg(rst->dev, "%s(rst=%p) (id=%lu) (nr_reset=%d)\n", __func__,
rst, rst->id, priv->nr_reset);
if (priv->nr_reset && rst->id > priv->nr_reset)
return -EINVAL;
return 0;
}
static int zynqmp_reset_probe(struct udevice *dev)
{
struct zynqmp_reset_priv *priv = dev_get_priv(dev);
if (device_is_compatible(dev, "xlnx,zynqmp-reset")) {
priv->reset_id = ZYNQMP_RESET_ID;
priv->nr_reset = ZYNQMP_NR_RESETS;
}
return 0;
}
const struct reset_ops zynqmp_reset_ops = {
.request = zynqmp_reset_request,
.rst_assert = zynqmp_reset_assert,
.rst_deassert = zynqmp_reset_deassert,
};
static const struct udevice_id zynqmp_reset_ids[] = {
{ .compatible = "xlnx,zynqmp-reset" },
{ .compatible = "xlnx,versal-reset" },
{ }
};
U_BOOT_DRIVER(zynqmp_reset) = {
.name = "zynqmp_reset",
.id = UCLASS_RESET,
.of_match = zynqmp_reset_ids,
.ops = &zynqmp_reset_ops,
.probe = zynqmp_reset_probe,
.priv_auto = sizeof(struct zynqmp_reset_priv),
};
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