mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-16 23:18:51 +09:00
![Shawn Guo](/assets/img/avatar_default.png)
It adds a Driver Model compatible reset driver for HiSlicon platform. The driver implements a custom .of_xlate function, and uses .data field as reset register offset and .id field as bit shift. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2019, Linaro Limited
|
|
*/
|
|
|
|
#include <asm/io.h>
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <dt-bindings/reset/ti-syscon.h>
|
|
#include <reset-uclass.h>
|
|
|
|
struct hisi_reset_priv {
|
|
void __iomem *base;
|
|
};
|
|
|
|
static int hisi_reset_deassert(struct reset_ctl *rst)
|
|
{
|
|
struct hisi_reset_priv *priv = dev_get_priv(rst->dev);
|
|
u32 val;
|
|
|
|
val = readl(priv->base + rst->data);
|
|
if (rst->polarity & DEASSERT_SET)
|
|
val |= BIT(rst->id);
|
|
else
|
|
val &= ~BIT(rst->id);
|
|
writel(val, priv->base + rst->data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hisi_reset_assert(struct reset_ctl *rst)
|
|
{
|
|
struct hisi_reset_priv *priv = dev_get_priv(rst->dev);
|
|
u32 val;
|
|
|
|
val = readl(priv->base + rst->data);
|
|
if (rst->polarity & ASSERT_SET)
|
|
val |= BIT(rst->id);
|
|
else
|
|
val &= ~BIT(rst->id);
|
|
writel(val, priv->base + rst->data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hisi_reset_free(struct reset_ctl *rst)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int hisi_reset_request(struct reset_ctl *rst)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int hisi_reset_of_xlate(struct reset_ctl *rst,
|
|
struct ofnode_phandle_args *args)
|
|
{
|
|
if (args->args_count != 3) {
|
|
debug("Invalid args_count: %d\n", args->args_count);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Use .data field as register offset and .id field as bit shift */
|
|
rst->data = args->args[0];
|
|
rst->id = args->args[1];
|
|
rst->polarity = args->args[2];
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct reset_ops hisi_reset_reset_ops = {
|
|
.of_xlate = hisi_reset_of_xlate,
|
|
.request = hisi_reset_request,
|
|
.free = hisi_reset_free,
|
|
.rst_assert = hisi_reset_assert,
|
|
.rst_deassert = hisi_reset_deassert,
|
|
};
|
|
|
|
static const struct udevice_id hisi_reset_ids[] = {
|
|
{ .compatible = "hisilicon,hi3798cv200-reset" },
|
|
{ }
|
|
};
|
|
|
|
static int hisi_reset_probe(struct udevice *dev)
|
|
{
|
|
struct hisi_reset_priv *priv = dev_get_priv(dev);
|
|
|
|
priv->base = dev_remap_addr(dev);
|
|
if (!priv->base)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_DRIVER(hisi_reset) = {
|
|
.name = "hisilicon_reset",
|
|
.id = UCLASS_RESET,
|
|
.of_match = hisi_reset_ids,
|
|
.ops = &hisi_reset_reset_ops,
|
|
.probe = hisi_reset_probe,
|
|
.priv_auto_alloc_size = sizeof(struct hisi_reset_priv),
|
|
};
|