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