mpc8xx_wdt.c
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// 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 */
}
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,
};