drivers/watchdog/sandbox_wdt.c

   1 /*
   2  * Copyright 2017 Google, Inc
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <wdt.h>
  10 #include <asm/state.h>
  11
  12 DECLARE_GLOBAL_DATA_PTR;
  13
  14 static int sandbox_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
  15 {
  16         struct sandbox_state *state = state_get_current();
  17
  18         state->wdt.counter = timeout;
  19         state->wdt.running = true;
  20
  21         return 0;
  22 }
  23
  24 static int sandbox_wdt_stop(struct udevice *dev)
  25 {
  26         struct sandbox_state *state = state_get_current();
  27
  28         state->wdt.running = false;
  29
  30         return 0;
  31 }
  32
  33 static int sandbox_wdt_reset(struct udevice *dev)
  34 {
  35         struct sandbox_state *state = state_get_current();
  36
  37         state->wdt.reset_count++;
  38
  39         return 0;
  40 }
  41
  42 static int sandbox_wdt_expire_now(struct udevice *dev, ulong flags)
  43 {
  44         sandbox_wdt_start(dev, 1, flags);
  45
  46         return 0;
  47 }
  48
  49 static const struct wdt_ops sandbox_wdt_ops = {
  50         .start = sandbox_wdt_start,
  51         .reset = sandbox_wdt_reset,
  52         .stop = sandbox_wdt_stop,
  53         .expire_now = sandbox_wdt_expire_now,
  54 };
  55
  56 static const struct udevice_id sandbox_wdt_ids[] = {
  57         { .compatible = "sandbox,wdt" },
  58         {}
  59 };
  60
  61 U_BOOT_DRIVER(wdt_sandbox) = {
  62         .name = "wdt_sandbox",
  63         .id = UCLASS_WDT,
  64         .of_match = sandbox_wdt_ids,
  65         .ops = &sandbox_wdt_ops,
  66 };