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