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// SPDX-License-Identifier: GPL-2.0
/*
* Texas Instruments DRA7 reset driver
*
* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
* Author: Keerthy <j-keerthy@ti.com>
*/
#include <asm/io.h>
#include <common.h>
#include <dm.h>
#include <reset-uclass.h>
#include <dm/device_compat.h>
struct dra7_reset_priv {
u32 rstctrl;
u32 rstst;
u8 nreset;
};
static int dra7_reset_request(struct reset_ctl *reset_ctl)
{
return 0;
}
static int dra7_reset_free(struct reset_ctl *reset_ctl)
{
return 0;
}
static inline void dra7_reset_rmw(u32 addr, u32 value, u32 mask)
{
writel(((readl(addr) & (~mask)) | (value & mask)), addr);
}
static int dra7_reset_deassert(struct reset_ctl *reset_ctl)
{
struct dra7_reset_priv *priv = dev_get_priv(reset_ctl->dev);
int mask = 1 << reset_ctl->id;
if (reset_ctl->id < 0 || reset_ctl->id >= priv->nreset)
return -EINVAL;
dra7_reset_rmw(priv->rstctrl, 0x0, mask);
while ((readl(priv->rstst) & mask) != mask)
;
return 0;
}
static int dra7_reset_assert(struct reset_ctl *reset_ctl)
{
struct dra7_reset_priv *priv = dev_get_priv(reset_ctl->dev);
int mask = 1 << reset_ctl->id;
if (reset_ctl->id < 0 || reset_ctl->id >= priv->nreset)
return -EINVAL;
dra7_reset_rmw(priv->rstctrl, mask, 0x0);
return 0;
}
struct reset_ops dra7_reset_ops = {
.request = dra7_reset_request,
.rfree = dra7_reset_free,
.rst_assert = dra7_reset_assert,
.rst_deassert = dra7_reset_deassert,
};
static const struct udevice_id dra7_reset_ids[] = {
{ .compatible = "ti,dra7-reset" },
{ }
};
static int dra7_reset_probe(struct udevice *dev)
{
struct dra7_reset_priv *priv = dev_get_priv(dev);
priv->rstctrl = dev_read_addr(dev);
priv->rstst = priv->rstctrl + 0x4;
priv->nreset = dev_read_u32_default(dev, "ti,nresets", 1);
dev_info(dev, "dra7-reset successfully probed %s\n", dev->name);
return 0;
}
U_BOOT_DRIVER(dra7_reset) = {
.name = "dra7_reset",
.id = UCLASS_RESET,
.of_match = dra7_reset_ids,
.probe = dra7_reset_probe,
.ops = &dra7_reset_ops,
.priv_auto_alloc_size = sizeof(struct dra7_reset_priv),
};
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