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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2017 General Electric Company. All rights reserved.
*/
#include <bootcount.h>
#include <fs.h>
#include <mapmem.h>
#define BC_MAGIC 0xbd
#define BC_VERSION 1
typedef struct {
u8 magic;
u8 version;
u8 bootcount;
u8 upgrade_available;
} bootcount_ext_t;
static u8 upgrade_available = 1;
void bootcount_store(ulong a)
{
bootcount_ext_t *buf;
loff_t len;
int ret;
if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE,
CONFIG_SYS_BOOTCOUNT_EXT_DEVPART, FS_TYPE_EXT)) {
puts("Error selecting device\n");
return;
}
/* Only update bootcount during upgrade process */
if (!upgrade_available)
return;
buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, sizeof(bootcount_ext_t));
buf->magic = BC_MAGIC;
buf->version = BC_VERSION;
buf->bootcount = (a & 0xff);
buf->upgrade_available = upgrade_available;
unmap_sysmem(buf);
ret = fs_write(CONFIG_SYS_BOOTCOUNT_EXT_NAME,
CONFIG_SYS_BOOTCOUNT_ADDR, 0, sizeof(bootcount_ext_t),
&len);
if (ret != 0)
puts("Error storing bootcount\n");
}
ulong bootcount_load(void)
{
bootcount_ext_t *buf;
loff_t len_read;
int ret;
if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE,
CONFIG_SYS_BOOTCOUNT_EXT_DEVPART, FS_TYPE_EXT)) {
puts("Error selecting device\n");
return 0;
}
ret = fs_read(CONFIG_SYS_BOOTCOUNT_EXT_NAME, CONFIG_SYS_BOOTCOUNT_ADDR,
0, sizeof(bootcount_ext_t), &len_read);
if (ret != 0 || len_read != sizeof(bootcount_ext_t)) {
puts("Error loading bootcount\n");
return 0;
}
buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, sizeof(bootcount_ext_t));
if (buf->magic == BC_MAGIC && buf->version == BC_VERSION) {
upgrade_available = buf->upgrade_available;
if (upgrade_available)
ret = buf->bootcount;
} else {
puts("Incorrect bootcount file\n");
}
unmap_sysmem(buf);
return ret;
}
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