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ARM: 8481/2: drivers: psci: replace psci firmware calls 

Switch to use a generic interface for issuing SMC/HVC based on ARM SMC
Calling Convention. Removes now the now unused psci-call.S.

Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Jens Wiklander 2016-01-04 15:46:47 +01:00 committed by Russell King
parent 14457459f9
commit e679660dbb
6 changed files with 23 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/Kconfig
View File

@ -1481,7 +1481,7 @@ config HOTPLUG_CPU
config ARM_PSCI
bool "Support for the ARM Power State Coordination Interface (PSCI)"
depends on CPU_V7
depends on HAVE_ARM_SMCCC
select ARM_PSCI_FW
help
Say Y here if you want Linux to communicate with system firmware

1
arch/arm/kernel/Makefile
View File

@ -87,7 +87,6 @@ obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_ARM_VIRT_EXT) += hyp-stub.o
ifeq ($(CONFIG_ARM_PSCI),y)
obj-y += psci-call.o
obj-$(CONFIG_SMP) += psci_smp.o
endif

31
arch/arm/kernel/psci-call.S
View File

@ -1,31 +0,0 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Copyright (C) 2015 ARM Limited
*
* Author: Mark Rutland <mark.rutland@arm.com>
*/
#include <linux/linkage.h>
#include <asm/opcodes-sec.h>
#include <asm/opcodes-virt.h>
/* int __invoke_psci_fn_hvc(u32 function_id, u32 arg0, u32 arg1, u32 arg2) */
ENTRY(__invoke_psci_fn_hvc)
__HVC(0)
bx lr
ENDPROC(__invoke_psci_fn_hvc)
/* int __invoke_psci_fn_smc(u32 function_id, u32 arg0, u32 arg1, u32 arg2) */
ENTRY(__invoke_psci_fn_smc)
__SMC(0)
bx lr
ENDPROC(__invoke_psci_fn_smc)

2
arch/arm64/kernel/Makefile
View File

@ -14,7 +14,7 @@ CFLAGS_REMOVE_return_address.o = -pg
arm64-obj-y := debug-monitors.o entry.o irq.o fpsimd.o \
entry-fpsimd.o process.o ptrace.o setup.o signal.o \
sys.o stacktrace.o time.o traps.o io.o vdso.o \
hyp-stub.o psci.o psci-call.o cpu_ops.o insn.o \
hyp-stub.o psci.o cpu_ops.o insn.o \
return_address.o cpuinfo.o cpu_errata.o \
cpufeature.o alternative.o cacheinfo.o \
smp.o smp_spin_table.o topology.o smccc-call.o

28
arch/arm64/kernel/psci-call.S
View File

@ -1,28 +0,0 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Copyright (C) 2015 ARM Limited
*
* Author: Will Deacon <will.deacon@arm.com>
*/
#include <linux/linkage.h>
/* int __invoke_psci_fn_hvc(u64 function_id, u64 arg0, u64 arg1, u64 arg2) */
ENTRY(__invoke_psci_fn_hvc)
hvc #0
ret
ENDPROC(__invoke_psci_fn_hvc)
/* int __invoke_psci_fn_smc(u64 function_id, u64 arg0, u64 arg1, u64 arg2) */
ENTRY(__invoke_psci_fn_smc)
smc #0
ret
ENDPROC(__invoke_psci_fn_smc)

23
drivers/firmware/psci.c
View File

@ -13,6 +13,7 @@
#define pr_fmt(fmt) "psci: " fmt
#include <linux/arm-smccc.h>
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/of.h>
@ -58,8 +59,6 @@ struct psci_operations psci_ops;
typedef unsigned long (psci_fn)(unsigned long, unsigned long,
unsigned long, unsigned long);
asmlinkage psci_fn __invoke_psci_fn_hvc;
asmlinkage psci_fn __invoke_psci_fn_smc;
static psci_fn *invoke_psci_fn;
enum psci_function {
@ -107,6 +106,26 @@ bool psci_power_state_is_valid(u32 state)
return !(state & ~valid_mask);
}
static unsigned long __invoke_psci_fn_hvc(unsigned long function_id,
unsigned long arg0, unsigned long arg1,
unsigned long arg2)
{
struct arm_smccc_res res;
arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
return res.a0;
}
static unsigned long __invoke_psci_fn_smc(unsigned long function_id,
unsigned long arg0, unsigned long arg1,
unsigned long arg2)
{
struct arm_smccc_res res;
arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
return res.a0;
}
static int psci_to_linux_errno(int errno)
{
switch (errno) {