1a047c23f9
Save and use the 3rd parameter of PSCI CPU_ON request: context_id.
The context_id parameter is only meaningful to the caller.
U-Boot PSCI preserves a copy of the value passed in this parameter.
Following wakeup from a powerdown state, U-BOOT PSCI places
this value in R0 when it first enters the OS.
NB: this context id is not (yet?) used by Linux but it is mandatory
to be PSCI compliant.
update armv7 psci functions:
- psci_save_target_pc(): keep for backward compatibility with
current platform (only save PC and force context id to 0)
=> should be removed when all platform migrate to the new API
- psci_save(): new API to use by ARMv7 platform with PSCI,
save pc (= entry_point_address) and context_id
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/*
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* Common PSCI functions
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*
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* Copyright (C) 2016 Chen-Yu Tsai
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* Author: Chen-Yu Tsai <wens@csie.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <asm/armv7.h>
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#include <asm/macro.h>
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#include <asm/psci.h>
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#include <asm/secure.h>
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#include <linux/linkage.h>
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static u32 psci_target_pc[CONFIG_ARMV7_PSCI_NR_CPUS] __secure_data = { 0 };
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static u32 psci_context_id[CONFIG_ARMV7_PSCI_NR_CPUS] __secure_data = { 0 };
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void __secure psci_save_target_pc(int cpu, u32 pc)
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{
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psci_target_pc[cpu] = pc;
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psci_context_id[cpu] = 0;
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dsb();
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}
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void __secure psci_save(int cpu, u32 pc, u32 context_id)
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{
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psci_target_pc[cpu] = pc;
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psci_context_id[cpu] = context_id;
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dsb();
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}
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u32 __secure psci_get_target_pc(int cpu)
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{
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return psci_target_pc[cpu];
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}
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u32 __secure psci_get_context_id(int cpu)
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{
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return psci_context_id[cpu];
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}
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