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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
* Copyright (c) 2019, Ahmad Fatoum, Pengutronix
*/
#include <common.h>
#include <driver.h>
#include <init.h>
#include <of.h>
#include <linux/reboot-mode.h>
#include <globalvar.h>
#include <magicvar.h>
static int __priority;
static struct reboot_mode_driver *__boot_mode;
static int reboot_mode_param_set(struct param_d *p, void *priv)
{
struct reboot_mode_driver *reboot = priv;
size_t i = reboot->reboot_mode_next * reboot->nelems;
return reboot->write(reboot, &reboot->magics[i]);
}
static int reboot_mode_add_param(struct device_d *dev,
const char *prefix,
struct reboot_mode_driver *reboot)
{
char name[sizeof "system.reboot_mode.when"];
struct param_d *param;
scnprintf(name, sizeof(name), "%sprev", prefix);
param = dev_add_param_enum_ro(dev, name,
&reboot->reboot_mode_prev, reboot->modes,
reboot->nmodes);
if (IS_ERR(param))
return PTR_ERR(param);
scnprintf(name, sizeof(name), "%snext", prefix);
param = dev_add_param_enum(dev, name,
reboot_mode_param_set, NULL,
&reboot->reboot_mode_next, reboot->modes,
reboot->nmodes, reboot);
return PTR_ERR_OR_ZERO(param);
}
static struct device_node *of_get_node_by_reproducible_name(struct device_node *dstroot,
struct device_node *srcnp)
{
struct device_node *dstnp;
char *name;
name = of_get_reproducible_name(srcnp);
dstnp = of_find_node_by_reproducible_name(dstroot, name);
free(name);
return dstnp;
}
static int of_reboot_mode_fixup(struct device_node *root, void *ctx)
{
struct reboot_mode_driver *reboot = ctx;
struct device_node *dstnp, *srcnp, *dstparent;
srcnp = reboot->dev->device_node;
dstnp = of_get_node_by_reproducible_name(root, srcnp);
if (dstnp) {
dstparent = dstnp->parent;
of_delete_node(dstnp);
} else {
dstparent = of_get_node_by_reproducible_name(root, srcnp->parent);
}
if (!dstparent)
return -EINVAL;
of_copy_node(dstparent, srcnp);
return 0;
}
static int reboot_mode_add_globalvar(void)
{
struct reboot_mode_driver *reboot = __boot_mode;
if (!reboot)
return 0;
if (!reboot->no_fixup)
of_register_fixup(of_reboot_mode_fixup, reboot);
return reboot_mode_add_param(&global_device, "system.reboot_mode.", reboot);
}
late_initcall(reboot_mode_add_globalvar);
static void reboot_mode_print(struct reboot_mode_driver *reboot,
const char *prefix, const u32 *arr)
{
size_t i;
dev_dbg(reboot->dev, "%s: ", prefix);
for (i = 0; i < reboot->nelems; i++)
__pr_printk(7, "%08x ", arr[i]);
__pr_printk(7, "\n");
}
static const char *get_mode_name(const struct property *prop)
{
unsigned prefix_len;
prefix_len = str_has_prefix(prop->name, "mode-");
if (!prefix_len)
prefix_len = str_has_prefix(prop->name, "barebox,mode-");
if (!prefix_len)
return NULL;
return prop->name + prefix_len;
}
/**
* reboot_mode_register - register a reboot mode driver
* @reboot: reboot mode driver
* @reboot_mode: reboot mode read from hardware
*
* Returns: 0 on success or a negative error code on failure.
*/
int reboot_mode_register(struct reboot_mode_driver *reboot,
const u32 *reboot_mode, size_t nelems)
{
struct property *prop;
struct device_node *np = reboot->dev->device_node;
const char *alias;
size_t nmodes = 0;
int i = 0;
int ret, normal = -1;
for_each_property_of_node(np, prop) {
u32 magic;
if (!get_mode_name(prop))
continue;
if (of_property_read_u32(np, prop->name, &magic))
continue;
nmodes++;
}
reboot->nmodes = nmodes;
reboot->nelems = nelems;
reboot->magics = xzalloc(nmodes * nelems * sizeof(u32));
reboot->modes = xzalloc(nmodes * sizeof(const char *));
reboot_mode_print(reboot, "registering magic", reboot_mode);
for_each_property_of_node(np, prop) {
const char **mode;
u32 *magic;
magic = &reboot->magics[i * nelems];
mode = &reboot->modes[i];
*mode = get_mode_name(prop);
if (!*mode)
continue;
if (*mode[0] == '\0') {
ret = -EINVAL;
dev_err(reboot->dev, "invalid mode name(%s): too short!\n",
prop->name);
goto error;
}
if (!strcmp(*mode, "normal"))
normal = i;
if (of_property_read_u32_array(np, prop->name, magic, nelems)) {
dev_err(reboot->dev, "reboot mode %s without magic number\n",
*mode);
continue;
}
reboot_mode_print(reboot, *mode, magic);
i++;
}
for (i = 0; i < reboot->nmodes; i++) {
if (memcmp(&reboot->magics[i * nelems], reboot_mode, nelems * sizeof(u32)))
continue;
reboot->reboot_mode_prev = i;
break;
}
reboot_mode_add_param(reboot->dev, "", reboot);
/* clear mode for next reboot */
if (normal >= 0)
reboot->write(reboot, &reboot->magics[normal]);
if (!reboot->priority)
reboot->priority = REBOOT_MODE_DEFAULT_PRIORITY;
if (reboot->priority >= __priority) {
__priority = reboot->priority;
__boot_mode = reboot;
}
alias = of_alias_get(np);
if (alias)
dev_set_name(reboot->dev, alias);
return 0;
error:
free(reboot->magics);
free(reboot->modes);
return ret;
}
EXPORT_SYMBOL_GPL(reboot_mode_register);
const char *reboot_mode_get(void)
{
if (!__boot_mode)
return NULL;
return __boot_mode->modes[__boot_mode->reboot_mode_prev];
}
EXPORT_SYMBOL_GPL(reboot_mode_get);
BAREBOX_MAGICVAR(global.system.reboot_mode.prev,
"reboot-mode: Mode set previously, before barebox start");
BAREBOX_MAGICVAR(global.system.reboot_mode.next,
"reboot-mode: Mode to set next, to be evaluated after reset");
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