path: root/arch/arm/mach-imx/imx7.c
diff options
authorSascha Hauer <>2017-02-06 16:11:03 +0100
committerSascha Hauer <>2017-02-13 08:35:42 +0100
commitcc407b41135d4a427dfb09fb6e32b831e6c98a31 (patch)
tree0ba793b8a0c041819e4409f0c31b2d4f297c997a /arch/arm/mach-imx/imx7.c
parentcdf33e6ecf4ca724d8be64fefbc4896eb8baf046 (diff)
ARM: Add PSCI support
This patch contains the barebox implementation for the ARM "Power State Coordination Interface" (PSCI). The interface is aimed at the generalization of code in the following power management scenarios: * Core idle management. * Dynamic addition and removal of cores, and secondary core boot. * big.LITTLE migration. * System shutdown and reset. In practice, all that's currently implemented is a way to enable the secondary core one some SoCs. With PSCI the Kernel is either started in nonsecure or in Hypervisor mode and PSCI is used to apply power to the secondary cores. The start mode is passed in the global.bootm.secure_state variable. This enum can contain "secure" (Kernel is started in secure mode, means no PSCI), "nonsecure" (Kernel is started in nonsecure mode, PSCI available) or "hyp" (Kernel is started in hyp mode, meaning it can support virtualization). We currently only support putting the secure monitor code into SDRAM, which means we always steal some amount of memory from the Kernel. To keep things simple for now we simply keep the whole barebox binary in memory The PSCI support has been tested on i.MX7 only so far. The only supported operations are CPU_ON and CPU_OFF. The PSCI and secure monitor code is based on the corresponding U-Boot code. Signed-off-by: Sascha Hauer <>
Diffstat (limited to 'arch/arm/mach-imx/imx7.c')
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/imx7.c b/arch/arm/mach-imx/imx7.c
index 96a9dd244d..1cd27a0dbc 100644
--- a/arch/arm/mach-imx/imx7.c
+++ b/arch/arm/mach-imx/imx7.c
@@ -15,6 +15,7 @@
#include <common.h>
#include <io.h>
#include <linux/sizes.h>
+#include <asm/psci.h>
#include <mach/imx7.h>
#include <mach/generic.h>
#include <mach/revision.h>