diff options
| author | Varun Wadekar <vwadekar@nvidia.com> | 2013-11-11 15:49:34 +0530 |
|---|---|---|
| committer | Varun Wadekar <vwadekar@nvidia.com> | 2013-12-03 20:05:13 -0800 |
| commit | 66c8ea1b606bffd20d6520e958859a76b8be86df (patch) | |
| tree | f019e61852812d786cf91436b5df57e1d9cf4f1e /arch/arm/mach-tegra/sleep.S | |
| parent | 3f2221cc49a7d8084a78e2b8ae9110d8f9d39fbc (diff) | |
arm: tegra: use ARM's DEN0028 v0.9 and PSCI specs to define SMCs
Use SIP Service calls (0x82000000x) and Standard Service calls
(0x8400000x) from the DEN0028 spec.
PSCI says that we need to use 0x8400000x in r0 for any power
management features i.e. cpu idle/hotplug/on/off followed by the
actual cpu state (LP2/LP1/LP0) in r1. This translates to Std service
calls space mentioned in the DEN0028 spec.
The SIP service calls can be used by silicon partners for their CPU
specific settings. We use this SMC space for L2 settings and to set
the CPU reset vector.
SMCs that are interrupted return a special status code to the NS world.
Look for that status and send a restart SMC (value = 60 << 24) when
received.
Also removed save/restore of r4-r12 as we rely on the secure OS to
do this for us.
Change-Id: I6fae83cc96d29c23305177df770fa07f7970c383
Signed-off-by: Scott Long <scottl@nvidia.com>
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
Reviewed-on: http://git-master/r/329998
Diffstat (limited to 'arch/arm/mach-tegra/sleep.S')
| -rw-r--r-- | arch/arm/mach-tegra/sleep.S | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/arch/arm/mach-tegra/sleep.S b/arch/arm/mach-tegra/sleep.S index 5e4b1473329f..b4827a16cf05 100644 --- a/arch/arm/mach-tegra/sleep.S +++ b/arch/arm/mach-tegra/sleep.S @@ -209,8 +209,8 @@ ENDPROC(tegra_flush_l1_cache) ENTRY(tegra_sleep_cpu_finish) mov r4, r0 #if defined(CONFIG_TEGRA_USE_SECURE_KERNEL) - ldr r0, =0xFFFFFFFC - ldr r1, =0xFFFFFFE4 + ldr r0, =0x84000001 + ldr r1, =((1 << 16) | 4) ldr r2, =TEGRA_RESET_HANDLER_BASE bl tegra_generic_smc #else @@ -350,17 +350,18 @@ ENDPROC(tegra_cpu_pllp) * the specified parameters. */ ENTRY(tegra_generic_smc) - adr r3, __tegra_smc_stack - stmia r3, {r4-r12, lr} mov r3, #0 - mov r4, #0 dsb smc #0 - adr r3, __tegra_smc_stack - ldmia r3, {r4-r12, pc} +restart: + ldr r3, =0xFFFFFFFD + cmp r0, r3 + bne done + mov r0, #(60 << 24) + dsb + smc #0 + b restart +done: + mov pc, lr ENDPROC(tegra_generic_smc) - .type __tegra_smc_stack, %object -__tegra_smc_stack: - .long 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 - .size __tegra_smc_stack, . - __tegra_smc_stack #endif |