rockchip: rk3399: Add bootcount support

Add bootcount support for Rockchip rk3399.

The bootcount value is preserved in PMU_SYS_REG0 register,
this would help to support redundent boot.

Once the redundant boot triggers, the altboot command
will look for extlinux-rollback.conf on particular
bootable partition which supposed to be a recovery
partition where redundant boot required.
Reviewed-by: NKever Yang <kever.yang@rock-chips.com>
Signed-off-by: NJagan Teki <jagan@amarulasolutions.com>

arch/arm/mach-rockchip/Kconfig

@@ -244,6 +244,8 @@ config ROCKCHIP_RK3399
 	imply TPL_CLK
 	imply TPL_TINY_MEMSET
 	imply TPL_ROCKCHIP_COMMON_BOARD
+	imply SYS_BOOTCOUNT_SINGLEWORD if BOOTCOUNT_LIMIT
+	imply CMD_BOOTCOUNT if BOOTCOUNT_LIMIT
 	help
 	  The Rockchip RK3399 is a ARM-based SoC with a dual-core Cortex-A72
 	  and quad-core Cortex-A53.

arch/arm/mach-rockchip/rk3399/Kconfig

@@ -113,6 +113,16 @@ config TPL_TEXT_BASE
 config SPL_STACK_R_ADDR
 	default 0x04000000
 
+if BOOTCOUNT_LIMIT
+
+config BOOTCOUNT_BOOTLIMIT
+	default 3
+
+config SYS_BOOTCOUNT_ADDR
+	default 0xff3100f0	# PMU_SYS_REG0
+
+endif # BOOTCOUNT_LIMIT
+
 source "board/rockchip/evb_rk3399/Kconfig"
 source "board/theobroma-systems/puma_rk3399/Kconfig"
 source "board/vamrs/rock960_rk3399/Kconfig"

include/configs/rk3399_common.h

@@ -63,7 +63,10 @@
 	"fdtfile=" CONFIG_DEFAULT_FDT_FILE "\0" \
 	"partitions=" PARTS_DEFAULT \
 	ROCKCHIP_DEVICE_SETTINGS \
-	BOOTENV
+	BOOTENV \
+	"altbootcmd=" \
+		"setenv boot_syslinux_conf extlinux/extlinux-rollback.conf;" \
+		"run distro_bootcmd\0"
 
 #endif