diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/bootcount/bootcount_i2c.c')
-rw-r--r-- | qemu/roms/u-boot/drivers/bootcount/bootcount_i2c.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/drivers/bootcount/bootcount_i2c.c b/qemu/roms/u-boot/drivers/bootcount/bootcount_i2c.c new file mode 100644 index 000000000..e27b168c5 --- /dev/null +++ b/qemu/roms/u-boot/drivers/bootcount/bootcount_i2c.c @@ -0,0 +1,44 @@ +/* + * (C) Copyright 2013 + * Heiko Schocher, DENX Software Engineering, hs@denx.de. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <bootcount.h> +#include <linux/compiler.h> +#include <i2c.h> + +#define BC_MAGIC 0xbc + +void bootcount_store(ulong a) +{ + unsigned char buf[3]; + int ret; + + buf[0] = BC_MAGIC; + buf[1] = (a & 0xff); + ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR, + CONFIG_BOOTCOUNT_ALEN, buf, 2); + if (ret != 0) + puts("Error writing bootcount\n"); +} + +ulong bootcount_load(void) +{ + unsigned char buf[3]; + int ret; + + ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR, + CONFIG_BOOTCOUNT_ALEN, buf, 2); + if (ret != 0) { + puts("Error loading bootcount\n"); + return 0; + } + if (buf[0] == BC_MAGIC) + return buf[1]; + + bootcount_store(0); + + return 0; +} |