LXR uboot/drivers/watchdog/mpc8xx

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright 2017 CS Systemes d'Information
   4 */
   5
   6#include <common.h>
   7#include <env.h>
   8#include <dm.h>
   9#include <wdt.h>
  10#include <mpc8xx.h>
  11#include <asm/cpm_8xx.h>
  12#include <asm/io.h>
  13
  14void hw_watchdog_reset(void)
  15{
  16        immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
  17
  18        out_be16(&immap->im_siu_conf.sc_swsr, 0x556c);  /* write magic1 */
  19        out_be16(&immap->im_siu_conf.sc_swsr, 0xaa39);  /* write magic2 */
  20}
  21
  22static int mpc8xx_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
  23{
  24        immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
  25        u32 val = CONFIG_SYS_SYPCR;
  26        const char *mode = env_get("watchdog_mode");
  27
  28        if (strcmp(mode, "off") == 0)
  29                val = val & ~(SYPCR_SWE | SYPCR_SWRI);
  30        else if (strcmp(mode, "nmi") == 0)
  31                val = (val & ~SYPCR_SWRI) | SYPCR_SWE;
  32
  33        out_be32(&immap->im_siu_conf.sc_sypcr, val);
  34
  35        if (!(in_be32(&immap->im_siu_conf.sc_sypcr) & SYPCR_SWE))
  36                return -EBUSY;
  37        return 0;
  38
  39}
  40
  41static int mpc8xx_wdt_stop(struct udevice *dev)
  42{
  43        immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
  44
  45        out_be32(&immap->im_siu_conf.sc_sypcr, CONFIG_SYS_SYPCR & ~SYPCR_SWE);
  46
  47        if (in_be32(&immap->im_siu_conf.sc_sypcr) & SYPCR_SWE)
  48                return -EBUSY;
  49        return 0;
  50}
  51
  52static int mpc8xx_wdt_reset(struct udevice *dev)
  53{
  54        hw_watchdog_reset();
  55
  56        return 0;
  57}
  58
  59static const struct wdt_ops mpc8xx_wdt_ops = {
  60        .start = mpc8xx_wdt_start,
  61        .reset = mpc8xx_wdt_reset,
  62        .stop = mpc8xx_wdt_stop,
  63};
  64
  65static const struct udevice_id mpc8xx_wdt_ids[] = {
  66        { .compatible = "fsl,pq1-wdt" },
  67        {}
  68};
  69
  70U_BOOT_DRIVER(wdt_mpc8xx) = {
  71        .name = "wdt_mpc8xx",
  72        .id = UCLASS_WDT,
  73        .of_match = mpc8xx_wdt_ids,
  74        .ops = &mpc8xx_wdt_ops,
  75};
  76