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// SPDX-License-Identifier: GPL-2.0
/*
* Broadcom STB generic reset controller
*
* Copyright (C) 2024 EPAM Systems
* Moved from linux kernel:
* Copyright (C) 2018-2020 Broadcom
*/
#include <asm/io.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <errno.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/iopoll.h>
#include <log.h>
#include <malloc.h>
#include <reset-uclass.h>
#define BRCM_RESCAL_START 0x0
#define BRCM_RESCAL_START_BIT BIT(0)
#define BRCM_RESCAL_CTRL 0x4
#define BRCM_RESCAL_STATUS 0x8
#define BRCM_RESCAL_STATUS_BIT BIT(0)
struct brcm_rescal_reset {
void __iomem *base;
};
/* Also doubles a deassert */
static int brcm_rescal_reset_set(struct reset_ctl *rst)
{
struct brcm_rescal_reset *data = dev_get_priv(rst->dev);
void __iomem *base = data->base;
u32 reg;
int ret;
reg = readl(base + BRCM_RESCAL_START);
writel(reg | BRCM_RESCAL_START_BIT, base + BRCM_RESCAL_START);
reg = readl(base + BRCM_RESCAL_START);
if (!(reg & BRCM_RESCAL_START_BIT)) {
dev_err(rst->dev, "failed to start SATA/PCIe rescal\n");
return -EIO;
}
ret = readl_poll_timeout(base + BRCM_RESCAL_STATUS, reg,
(reg & BRCM_RESCAL_STATUS_BIT), 100);
if (ret) {
dev_err(rst->dev, "time out on SATA/PCIe rescal\n");
return ret;
}
reg = readl(base + BRCM_RESCAL_START);
writel(reg & ~BRCM_RESCAL_START_BIT, base + BRCM_RESCAL_START);
dev_dbg(rst->dev, "SATA/PCIe rescal success\n");
return 0;
}
/* A dummy function - deassert/reset does all the work */
static int brcm_rescal_reset_assert(struct reset_ctl *rst)
{
return 0;
}
static int brcm_rescal_reset_xlate(struct reset_ctl *reset_ctl,
struct ofnode_phandle_args *args)
{
/* This is needed if #reset-cells == 0. */
return 0;
}
static const struct reset_ops brcm_rescal_reset_ops = {
.rst_deassert = brcm_rescal_reset_set,
.rst_assert = brcm_rescal_reset_assert,
.of_xlate = brcm_rescal_reset_xlate,
};
static int brcm_rescal_reset_probe(struct udevice *dev)
{
struct brcm_rescal_reset *data = dev_get_priv(dev);
data->base = dev_remap_addr(dev);
if (!data->base)
return -EINVAL;
return 0;
}
static const struct udevice_id brcm_rescal_reset_of_match[] = {
{.compatible = "brcm,bcm7216-pcie-sata-rescal"},
{},
};
U_BOOT_DRIVER(brcmstb_reset_rescal) = {
.name = "brcmstb-reset-rescal",
.id = UCLASS_RESET,
.of_match = brcm_rescal_reset_of_match,
.ops = &brcm_rescal_reset_ops,
.probe = brcm_rescal_reset_probe,
.priv_auto = sizeof(struct brcm_rescal_reset),
};
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