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ARM: highbank: Add smc calls to enable/disable the L2 

Linux runs in non-secure mode on highbank, so we need secure monitor calls
to enable and disable the PL310. Rather than invent new smc calls, the same
calling convention used by OMAP is used here.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Rob Herring 2012-06-06 17:20:10 -05:00 committed by Olof Johansson
parent 6f4b3bf5dc
commit 8e56130dcb
4 changed files with 47 additions and 1 deletions
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6
arch/arm/mach-highbank/Makefile
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@ -1,4 +1,8 @@
obj-y := clock.o highbank.o system.o
obj-y := clock.o highbank.o system.o smc.o
plus_sec := $(call as-instr,.arch_extension sec,+sec)
AFLAGS_smc.o :=-Wa,-march=armv7-a$(plus_sec)
obj-$(CONFIG_DEBUG_HIGHBANK_UART) += lluart.o
obj-$(CONFIG_SMP) += platsmp.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o

1
arch/arm/mach-highbank/core.h
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@ -8,3 +8,4 @@ extern void highbank_lluart_map_io(void);
static inline void highbank_lluart_map_io(void) {}
#endif
extern void highbank_smc1(int fn, int arg);

14
arch/arm/mach-highbank/highbank.c
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@ -85,10 +85,24 @@ const static struct of_device_id irq_match[] = {
{}
};
#ifdef CONFIG_CACHE_L2X0
static void highbank_l2x0_disable(void)
{
/* Disable PL310 L2 Cache controller */
highbank_smc1(0x102, 0x0);
}
#endif
static void __init highbank_init_irq(void)
{
of_irq_init(irq_match);
#ifdef CONFIG_CACHE_L2X0
/* Enable PL310 L2 Cache controller */
highbank_smc1(0x102, 0x1);
l2x0_of_init(0, ~0UL);
outer_cache.disable = highbank_l2x0_disable;
#endif
}
static void __init highbank_timer_init(void)

27
arch/arm/mach-highbank/smc.S Normal file
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@ -0,0 +1,27 @@
/*
* Copied from omap44xx-smc.S Copyright (C) 2010 Texas Instruments, Inc.
* Copyright 2012 Calxeda, Inc.
*
* 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.
*/
#include <linux/linkage.h>
/*
* This is common routine to manage secure monitor API
* used to modify the PL310 secure registers.
* 'r0' contains the value to be modified and 'r12' contains
* the monitor API number.
* Function signature : void highbank_smc1(u32 fn, u32 arg)
*/
ENTRY(highbank_smc1)
stmfd sp!, {r4-r11, lr}
mov r12, r0
mov r0, r1
dsb
smc #0
ldmfd sp!, {r4-r11, pc}
ENDPROC(highbank_smc1)