diff options
Diffstat (limited to 'drivers/bootcount/bootcount_nvmem.c')
| -rw-r--r-- | drivers/bootcount/bootcount_nvmem.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/bootcount/bootcount_nvmem.c b/drivers/bootcount/bootcount_nvmem.c new file mode 100644 index 0000000000..5f266d5ec8 --- /dev/null +++ b/drivers/bootcount/bootcount_nvmem.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2011 + * Heiko Schocher, DENX Software Engineering, hs@denx.de. + * (C) Copyright 2018 Robert Bosch Power Tools GmbH. + * + * A bootcount driver for the RTC IP block found on many TI platforms. + * This requires the RTC clocks, etc, to be enabled prior to use and + * not all boards with this IP block on it will have the RTC in use. + */ + +#include <bootcount.h> +#include <asm/davinci_rtc.h> + +#define BC_VERSION 2 + +void bootcount_store(ulong bootcount) +{ + u8 upgrade_available = 0; + ulong val = 0; + struct davinci_rtc *reg = + (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR; + + val = raw_bootcount_load(®->scratch2); + upgrade_available = (val >> 8) & 0x000000ff; + + /* Only update bootcount during upgrade process */ + if (!upgrade_available) + bootcount = 0; + + val = (bootcount & 0x000000ff) | + (upgrade_available << 8) | + (BC_VERSION << 16) | + (CONFIG_SYS_BOOTCOUNT_MAGIC << 24); + + /* + * write RTC kick registers to enable write + * for RTC Scratch registers. Scratch register 2 is + * used for bootcount value. + */ + writel(RTC_KICK0R_WE, ®->kick0r); + writel(RTC_KICK1R_WE, ®->kick1r); + raw_bootcount_store(®->scratch2, val); +} + +ulong bootcount_load(void) +{ + unsigned long val = 0; + struct davinci_rtc *reg = + (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR; + + val = raw_bootcount_load(®->scratch2); + if ((val >> 24) != CONFIG_SYS_BOOTCOUNT_MAGIC) + return 0; + else + return val & 0x000000ff; +} |