drivers/misc/sysreset_sandbox.c

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <sysreset.h>
  12 #include <asm/state.h>
  13 #include <asm/test.h>
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 static int sandbox_warm_sysreset_request(struct udevice *dev,
  18                                          enum sysreset_t type)
  19 {
  20         struct sandbox_state *state = state_get_current();
  21
  22         switch (type) {
  23         case SYSRESET_WARM:
  24                 state->last_sysreset = type;
  25                 break;
  26         default:
  27                 return -ENOSYS;
  28         }
  29         if (!state->sysreset_allowed[type])
  30                 return -EACCES;
  31
  32         return -EINPROGRESS;
  33 }
  34
  35 static int sandbox_sysreset_request(struct udevice *dev, enum sysreset_t type)
  36 {
  37         struct sandbox_state *state = state_get_current();
  38
  39         /*
  40          * If we have a device tree, the device we created from platform data
  41          * (see the U_BOOT_DEVICE() declaration below) should not do anything.
  42          * If we are that device, return an error.
  43          */
  44         if (state->fdt_fname && dev->of_offset == -1)
  45                 return -ENODEV;
  46
  47         switch (type) {
  48         case SYSRESET_COLD:
  49                 state->last_sysreset = type;
  50                 break;
  51         case SYSRESET_POWER:
  52                 state->last_sysreset = type;
  53                 if (!state->sysreset_allowed[type])
  54                         return -EACCES;
  55                 sandbox_exit();
  56                 break;
  57         default:
  58                 return -ENOSYS;
  59         }
  60         if (!state->sysreset_allowed[type])
  61                 return -EACCES;
  62
  63         return -EINPROGRESS;
  64 }
  65
  66 static struct sysreset_ops sandbox_sysreset_ops = {
  67         .request        = sandbox_sysreset_request,
  68 };
  69
  70 static const struct udevice_id sandbox_sysreset_ids[] = {
  71         { .compatible = "sandbox,reset" },
  72         { }
  73 };
  74
  75 U_BOOT_DRIVER(sysreset_sandbox) = {
  76         .name           = "sysreset_sandbox",
  77         .id             = UCLASS_SYSRESET,
  78         .of_match       = sandbox_sysreset_ids,
  79         .ops            = &sandbox_sysreset_ops,
  80 };
  81
  82 static struct sysreset_ops sandbox_warm_sysreset_ops = {
  83         .request        = sandbox_warm_sysreset_request,
  84 };
  85
  86 static const struct udevice_id sandbox_warm_sysreset_ids[] = {
  87         { .compatible = "sandbox,warm-reset" },
  88         { }
  89 };
  90
  91 U_BOOT_DRIVER(warm_sysreset_sandbox) = {
  92         .name           = "warm_sysreset_sandbox",
  93         .id             = UCLASS_SYSRESET,
  94         .of_match       = sandbox_warm_sysreset_ids,
  95         .ops            = &sandbox_warm_sysreset_ops,
  96 };
  97
  98 /* This is here in case we don't have a device tree */
  99 U_BOOT_DEVICE(sysreset_sandbox_non_fdt) = {
 100         .name = "sysreset_sandbox",
 101 };