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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2015-04-21 07:18:26 +0200 |
|---|---|---|
| committer | Tom Warren <twarren@nvidia.com> | 2015-05-13 09:24:13 -0700 |
| commit | 680f396851b7153f7f4243e1cc8875558b678add (patch) | |
| tree | a21e82f7e291391764c1ce5d58de208c3d84b1a6 | |
| parent | 104d6fb6cd064c4c9278e5b6fdf99ac025597753 (diff) | |
| download | u-boot-imx-680f396851b7153f7f4243e1cc8875558b678add.zip u-boot-imx-680f396851b7153f7f4243e1cc8875558b678add.tar.gz u-boot-imx-680f396851b7153f7f4243e1cc8875558b678add.tar.bz2 | |
ARM: Factor out common psci_get_cpu_id
Will be required for obtaining the ID of the current CPU in shared PSCI
functions. The default implementation requires a dense ID space and only
supports a single cluster. Therefore, the functions can be overloaded in
cases where these assumptions do not hold.
CC: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Tested-by: Ian Campbell <ijc@hellion.org.uk>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Tom Warren <twarren@nvidia.com>
| -rw-r--r-- | arch/arm/cpu/armv7/psci.S | 8 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/sunxi/psci.S | 12 |
2 files changed, 15 insertions, 5 deletions
diff --git a/arch/arm/cpu/armv7/psci.S b/arch/arm/cpu/armv7/psci.S index bf11a34..12ad09b 100644 --- a/arch/arm/cpu/armv7/psci.S +++ b/arch/arm/cpu/armv7/psci.S @@ -99,4 +99,12 @@ _smc_psci: pop {r4-r7, lr} movs pc, lr @ Return to the kernel +@ Requires dense and single-cluster CPU ID space +ENTRY(psci_get_cpu_id) + mrc p15, 0, r0, c0, c0, 5 /* read MPIDR */ + and r0, r0, #0xff /* return CPU ID in cluster */ + bx lr +ENDPROC(psci_get_cpu_id) +.weak psci_get_cpu_id + .popsection diff --git a/arch/arm/cpu/armv7/sunxi/psci.S b/arch/arm/cpu/armv7/sunxi/psci.S index 07b2d76..bcc419d 100644 --- a/arch/arm/cpu/armv7/sunxi/psci.S +++ b/arch/arm/cpu/armv7/sunxi/psci.S @@ -19,6 +19,7 @@ #include <config.h> #include <asm/gic.h> +#include <asm/macro.h> #include <asm/psci.h> #include <asm/arch/cpu.h> @@ -290,6 +291,8 @@ psci_cpu_off: .globl psci_arch_init psci_arch_init: + mov r6, lr + movw r4, #(GICD_BASE & 0xffff) movt r4, #(GICD_BASE >> 16) @@ -315,18 +318,17 @@ psci_arch_init: mcr p15, 0, r5, c1, c1, 0 @ Write SCR isb - mrc p15, 0, r4, c0, c0, 5 @ MPIDR - and r4, r4, #3 @ cpu number in cluster + bl psci_get_cpu_id mov r5, #0x400 @ 1kB of stack per CPU - mul r4, r4, r5 + mul r0, r0, r5 adr r5, text_end @ end of text add r5, r5, #0x2000 @ Skip two pages lsr r5, r5, #12 @ Align to start of page lsl r5, r5, #12 - sub sp, r5, r4 @ here's our stack! + sub sp, r5, r0 @ here's our stack! - bx lr + bx r6 text_end: .popsection |