diff options
Diffstat (limited to 'roms/u-boot/drivers/bootcount/bootcount_davinci.c')
| -rw-r--r-- | roms/u-boot/drivers/bootcount/bootcount_davinci.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/bootcount/bootcount_davinci.c b/roms/u-boot/drivers/bootcount/bootcount_davinci.c new file mode 100644 index 000000000..6326957d7 --- /dev/null +++ b/roms/u-boot/drivers/bootcount/bootcount_davinci.c @@ -0,0 +1,41 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2011 + * Heiko Schocher, DENX Software Engineering, hs@denx.de. + * + * 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> + +void bootcount_store(ulong a) +{ + struct davinci_rtc *reg = + (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR; + + /* + * 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, + (CONFIG_SYS_BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff)); +} + +ulong bootcount_load(void) +{ + unsigned long val; + struct davinci_rtc *reg = + (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR; + + val = raw_bootcount_load(®->scratch2); + if ((val & 0xffff0000) != (CONFIG_SYS_BOOTCOUNT_MAGIC & 0xffff0000)) + return 0; + else + return val & 0x0000ffff; +} |