mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-30 15:03:18 +00:00
f27d73e941
According to Server Base System Architecture (SBSA) specification, the SBSA Generic Watchdog has two stage timeouts: the first signal (WS0) is for alerting the system by interrupt, the second one (WS1) is a real hardware reset. More details about the hardware specification of this device: ARM DEN0029B - Server Base System Architecture (SBSA) This driver can operate ARM SBSA Generic Watchdog as a single stage In the single stage mode, when the timeout is reached, your system will be reset by WS1. The first signal (WS0) is ignored. Signed-off-by: Zhao Qiang <qiang.zhao@nxp.com> Signed-off-by: Biwen Li <biwen.li@nxp.com> Reviewed-by: Stefan Roese <sr@denx.de> Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
131 lines
2.8 KiB
C
131 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Watchdog driver for SBSA
|
|
*
|
|
* Copyright 2020 NXP
|
|
*/
|
|
|
|
#include <asm/io.h>
|
|
#include <common.h>
|
|
#include <dm/device.h>
|
|
#include <dm/fdtaddr.h>
|
|
#include <dm/read.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/err.h>
|
|
#include <watchdog.h>
|
|
#include <wdt.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/* SBSA Generic Watchdog register definitions */
|
|
/* refresh frame */
|
|
#define SBSA_GWDT_WRR 0x000
|
|
|
|
/* control frame */
|
|
#define SBSA_GWDT_WCS 0x000
|
|
#define SBSA_GWDT_WOR 0x008
|
|
#define SBSA_GWDT_WCV 0x010
|
|
|
|
/* refresh/control frame */
|
|
#define SBSA_GWDT_W_IIDR 0xfcc
|
|
#define SBSA_GWDT_IDR 0xfd0
|
|
|
|
/* Watchdog Control and Status Register */
|
|
#define SBSA_GWDT_WCS_EN BIT(0)
|
|
#define SBSA_GWDT_WCS_WS0 BIT(1)
|
|
#define SBSA_GWDT_WCS_WS1 BIT(2)
|
|
|
|
struct sbsa_gwdt_priv {
|
|
void __iomem *reg_refresh;
|
|
void __iomem *reg_control;
|
|
};
|
|
|
|
static int sbsa_gwdt_reset(struct udevice *dev)
|
|
{
|
|
struct sbsa_gwdt_priv *priv = dev_get_priv(dev);
|
|
|
|
writel(0, priv->reg_refresh + SBSA_GWDT_WRR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sbsa_gwdt_start(struct udevice *dev, u64 timeout, ulong flags)
|
|
{
|
|
struct sbsa_gwdt_priv *priv = dev_get_priv(dev);
|
|
u32 clk;
|
|
|
|
/*
|
|
* it work in the single stage mode in u-boot,
|
|
* The first signal (WS0) is ignored,
|
|
* the timeout is (WOR * 2), so the WOR should be configured
|
|
* to half value of timeout.
|
|
*/
|
|
clk = get_tbclk();
|
|
writel(clk / 2 * timeout,
|
|
priv->reg_control + SBSA_GWDT_WOR);
|
|
|
|
/* writing WCS will cause an explicit watchdog refresh */
|
|
writel(SBSA_GWDT_WCS_EN, priv->reg_control + SBSA_GWDT_WCS);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sbsa_gwdt_stop(struct udevice *dev)
|
|
{
|
|
struct sbsa_gwdt_priv *priv = dev_get_priv(dev);
|
|
|
|
writel(0, priv->reg_control + SBSA_GWDT_WCS);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sbsa_gwdt_expire_now(struct udevice *dev, ulong flags)
|
|
{
|
|
sbsa_gwdt_start(dev, 0, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sbsa_gwdt_probe(struct udevice *dev)
|
|
{
|
|
debug("%s: Probing wdt%u (sbsa-gwdt)\n", __func__, dev->seq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sbsa_gwdt_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
struct sbsa_gwdt_priv *priv = dev_get_priv(dev);
|
|
|
|
priv->reg_control = (void __iomem *)dev_read_addr_index(dev, 0);
|
|
if (IS_ERR(priv->reg_control))
|
|
return PTR_ERR(priv->reg_control);
|
|
|
|
priv->reg_refresh = (void __iomem *)dev_read_addr_index(dev, 1);
|
|
if (IS_ERR(priv->reg_refresh))
|
|
return PTR_ERR(priv->reg_refresh);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct wdt_ops sbsa_gwdt_ops = {
|
|
.start = sbsa_gwdt_start,
|
|
.reset = sbsa_gwdt_reset,
|
|
.stop = sbsa_gwdt_stop,
|
|
.expire_now = sbsa_gwdt_expire_now,
|
|
};
|
|
|
|
static const struct udevice_id sbsa_gwdt_ids[] = {
|
|
{ .compatible = "arm,sbsa-gwdt" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(sbsa_gwdt) = {
|
|
.name = "sbsa_gwdt",
|
|
.id = UCLASS_WDT,
|
|
.of_match = sbsa_gwdt_ids,
|
|
.probe = sbsa_gwdt_probe,
|
|
.priv_auto_alloc_size = sizeof(struct sbsa_gwdt_priv),
|
|
.ofdata_to_platdata = sbsa_gwdt_ofdata_to_platdata,
|
|
.ops = &sbsa_gwdt_ops,
|
|
};
|