u-boot/drivers/watchdog/mpc8xx_wdt.c
Charles Frey ea8de984e5 watchdog: mpc8xx_wdt: Allow selection of watchdog mode through environment
The mpc8xx watchdog can work either in 'reset mode' or 'NMI mode'.
The selection can be done at startup only.
It is desirable to select the mode without rebuilding U-boot.
It is also desirable to disable the watchdog without rebuilding.

At watchdog startup, check environment variable 'watchdog_mode'.
If it is 'off', the watchdog is not started. If it is 'nmi',
the watchdog is started in NMI mode. Otherwise, it is started
in reset mode which is the default mode.

Signed-off-by: Charles Frey <charles.frey@c-s.fr>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
2020-04-24 10:09:59 -04:00

76 lines
1.6 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2017 CS Systemes d'Information
*/
#include <common.h>
#include <env.h>
#include <dm.h>
#include <wdt.h>
#include <mpc8xx.h>
#include <asm/cpm_8xx.h>
#include <asm/io.h>
void hw_watchdog_reset(void)
{
immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
out_be16(&immap->im_siu_conf.sc_swsr, 0x556c); /* write magic1 */
out_be16(&immap->im_siu_conf.sc_swsr, 0xaa39); /* write magic2 */
}
static int mpc8xx_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
{
immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
u32 val = CONFIG_SYS_SYPCR;
const char *mode = env_get("watchdog_mode");
if (strcmp(mode, "off") == 0)
val = val & ~(SYPCR_SWE | SYPCR_SWRI);
else if (strcmp(mode, "nmi") == 0)
val = (val & ~SYPCR_SWRI) | SYPCR_SWE;
out_be32(&immap->im_siu_conf.sc_sypcr, val);
if (!(in_be32(&immap->im_siu_conf.sc_sypcr) & SYPCR_SWE))
return -EBUSY;
return 0;
}
static int mpc8xx_wdt_stop(struct udevice *dev)
{
immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
out_be32(&immap->im_siu_conf.sc_sypcr, CONFIG_SYS_SYPCR & ~SYPCR_SWE);
if (in_be32(&immap->im_siu_conf.sc_sypcr) & SYPCR_SWE)
return -EBUSY;
return 0;
}
static int mpc8xx_wdt_reset(struct udevice *dev)
{
hw_watchdog_reset();
return 0;
}
static const struct wdt_ops mpc8xx_wdt_ops = {
.start = mpc8xx_wdt_start,
.reset = mpc8xx_wdt_reset,
.stop = mpc8xx_wdt_stop,
};
static const struct udevice_id mpc8xx_wdt_ids[] = {
{ .compatible = "fsl,pq1-wdt" },
{}
};
U_BOOT_DRIVER(wdt_mpc8xx) = {
.name = "wdt_mpc8xx",
.id = UCLASS_WDT,
.of_match = mpc8xx_wdt_ids,
.ops = &mpc8xx_wdt_ops,
};