mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-25 04:23:46 +00:00
749c9aae9d
This patch adds a DM driver for the MPC8xx watchdog. Basically, the watchdog is enabled by default from the start and SYPCR register has to be writen once to set the timeout and/or deactivate the watchdog. Once written, it cannot be written again. It means that wdt_stop() can be called before wdt_start() to stop the watchdog, but cannot be called if wdt_start() has been called. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright 2017 CS Systemes d'Information
|
|
*/
|
|
|
|
#include <common.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 */
|
|
}
|
|
|
|
#ifdef CONFIG_WDT_MPC8xx
|
|
static int mpc8xx_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
|
|
{
|
|
immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
|
|
|
|
out_be32(&immap->im_siu_conf.sc_sypcr, CONFIG_SYS_SYPCR);
|
|
|
|
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,
|
|
};
|
|
#endif /* CONFIG_WDT_MPC8xx */
|