Exynos542x: CPU: Power down all secondary cores
This patch adds code to shutdown secondary cores.
When U-boot comes up, all secondary cores appear powered on,
which is undesirable and causes side effects while
initializing these cores in kernel.
Secondary core power down happens in following steps:
Step-1: After Exynos power-on, primary core starts executing first.
Step-2: In iROM code every core has to check 2 flags i.e.
addresses 0x02020028 & 0x02020004.
Step-3: Initially 0x02020028 is 0 for all cores and 0x02020004 has a
jump address for primary core and 0 for all secondary cores.
Step-4: Therefore, primary core follows normal iROM execution and jumps
to BL1 eventually, whereas all secondary cores enter WFE.
Step-5: When primary core comes into function secondary_cores_configure,
it puts pointer to function power_down_core into 0x02020004
and provides DSB and SEV for all cores so that they may come out
of WFE and jump to power_down_core function.
Step-6: And ultimately because of power_down_core all
secondary cores shut-down.
Signed-off-by: Kimoon Kim <kimoon.kim@samsung.com>
Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/arch/arm/include/asm/arch-exynos/cpu.h b/arch/arm/include/asm/arch-exynos/cpu.h
index 29674ad..e739520 100644
--- a/arch/arm/include/asm/arch-exynos/cpu.h
+++ b/arch/arm/include/asm/arch-exynos/cpu.h
@@ -153,6 +153,10 @@
#define EXYNOS5420_CLOCK_BASE 0x10010000
#define EXYNOS5420_POWER_BASE 0x10040000
#define EXYNOS5420_SWRESET 0x10040400
+#define EXYNOS5420_INFORM_BASE 0x10040800
+#define EXYNOS5420_SPARE_BASE 0x10040900
+#define EXYNOS5420_CPU_CONFIG_BASE 0x10042000
+#define EXYNOS5420_CPU_STATUS_BASE 0x10042004
#define EXYNOS5420_SYSREG_BASE 0x10050000
#define EXYNOS5420_TZPC_BASE 0x100E0000
#define EXYNOS5420_WATCHDOG_BASE 0x101D0000
@@ -186,6 +190,7 @@
#define EXYNOS5420_USB3PHY_BASE DEVICE_NOT_AVAILABLE
#define EXYNOS5420_USB_HOST_XHCI_BASE DEVICE_NOT_AVAILABLE
+
#ifndef __ASSEMBLY__
#include <asm/io.h>
/* CPU detection macros */