bootcount.h
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* (C) Copyright 2012
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*/
#ifndef _BOOTCOUNT_H__
#define _BOOTCOUNT_H__
#include <common.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <env.h>
#ifdef CONFIG_DM_BOOTCOUNT
struct bootcount_ops {
/**
* get() - get the current bootcount value
*
* Returns the current counter value of the bootcount backing
* store.
*
* @dev: Device to read from
* @bootcount: Address to put the current bootcount value
*/
int (*get)(struct udevice *dev, u32 *bootcount);
/**
* set() - set a bootcount value (e.g. to reset or increment)
*
* Sets the value in the bootcount backing store.
*
* @dev: Device to read from
* @bootcount: New bootcount value to store
*/
int (*set)(struct udevice *dev, const u32 bootcount);
};
/* Access the operations for a bootcount device */
#define bootcount_get_ops(dev) ((struct bootcount_ops *)(dev)->driver->ops)
/**
* dm_bootcount_get() - Read the current value from a bootcount storage
*
* @dev: Device to read from
* @bootcount: Place to put the current bootcount
* @return 0 if OK, -ve on error
*/
int dm_bootcount_get(struct udevice *dev, u32 *bootcount);
/**
* dm_bootcount_set() - Write a value to a bootcount storage
*
* @dev: Device to read from
* @bootcount: Value to be written to the backing storage
* @return 0 if OK, -ve on error
*/
int dm_bootcount_set(struct udevice *dev, u32 bootcount);
#endif
/** bootcount_store() - store the current bootcount */
void bootcount_store(ulong);
/**
* bootcount_load() - load the current bootcount
*
* @return bootcount, read from the appropriate location
*/
ulong bootcount_load(void);
#if defined(CONFIG_SPL_BOOTCOUNT_LIMIT) || defined(CONFIG_BOOTCOUNT_LIMIT)
#if !defined(CONFIG_SYS_BOOTCOUNT_LE) && !defined(CONFIG_SYS_BOOTCOUNT_BE)
# if __BYTE_ORDER == __LITTLE_ENDIAN
# define CONFIG_SYS_BOOTCOUNT_LE
# else
# define CONFIG_SYS_BOOTCOUNT_BE
# endif
#endif
#ifdef CONFIG_SYS_BOOTCOUNT_LE
static inline void raw_bootcount_store(volatile u32 *addr, u32 data)
{
out_le32(addr, data);
}
static inline u32 raw_bootcount_load(volatile u32 *addr)
{
return in_le32(addr);
}
#else
static inline void raw_bootcount_store(volatile u32 *addr, u32 data)
{
out_be32(addr, data);
}
static inline u32 raw_bootcount_load(volatile u32 *addr)
{
return in_be32(addr);
}
#endif
DECLARE_GLOBAL_DATA_PTR;
static inline int bootcount_error(void)
{
unsigned long bootcount = bootcount_load();
unsigned long bootlimit = env_get_ulong("bootlimit", 10, 0);
if (bootlimit && bootcount > bootlimit) {
printf("Warning: Bootlimit (%lu) exceeded.", bootlimit);
if (!(gd->flags & GD_FLG_SPL_INIT))
printf(" Using altbootcmd.");
printf("\n");
return 1;
}
return 0;
}
static inline void bootcount_inc(void)
{
unsigned long bootcount = bootcount_load();
if (gd->flags & GD_FLG_SPL_INIT) {
bootcount_store(++bootcount);
return;
}
#ifndef CONFIG_SPL_BUILD
/* Only increment bootcount when no bootcount support in SPL */
#ifndef CONFIG_SPL_BOOTCOUNT_LIMIT
bootcount_store(++bootcount);
#endif
env_set_ulong("bootcount", bootcount);
#endif /* !CONFIG_SPL_BUILD */
}
#else
static inline int bootcount_error(void) { return 0; }
static inline void bootcount_inc(void) {}
#endif /* CONFIG_SPL_BOOTCOUNT_LIMIT || CONFIG_BOOTCOUNT_LIMIT */
#endif /* _BOOTCOUNT_H__ */