mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 10:48:51 +00:00
0be4b0b651
In case the ops is not implemented, return 0 in the core right away. This is better than having multiple copies of functions which just return 0 in each reset driver. Drop all those empty functions. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Simon Glass <sjg@chromium.org> Cc: Tom Rini <trini@konsulko.com>
85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
// 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 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 = {
|
|
.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 = sizeof(struct dra7_reset_priv),
|
|
};
|