M7350/kernel/arch/arm/mach-msm/msm-krait-l2-accessors.c
2024-09-09 08:52:07 +00:00

76 lines
2.0 KiB
C

/*
* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only 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.
*/
#include <linux/spinlock.h>
#include <linux/module.h>
#include <asm/mach-types.h>
#include <asm/cputype.h>
DEFINE_RAW_SPINLOCK(l2_access_lock);
u32 set_get_l2_indirect_reg(u32 reg_addr, u32 val)
{
unsigned long flags;
u32 ret_val;
raw_spin_lock_irqsave(&l2_access_lock, flags);
mb();
asm volatile ("mcr p15, 3, %[l2cpselr], c15, c0, 6\n\t"
"isb\n\t"
"mcr p15, 3, %[l2cpdr], c15, c0, 7\n\t"
"isb\n\t"
"mrc p15, 3, %[l2cpdr_read], c15, c0, 7\n\t"
: [l2cpdr_read]"=r" (ret_val)
: [l2cpselr]"r" (reg_addr), [l2cpdr]"r" (val)
);
raw_spin_unlock_irqrestore(&l2_access_lock, flags);
return ret_val;
}
EXPORT_SYMBOL(set_get_l2_indirect_reg);
void set_l2_indirect_reg(u32 reg_addr, u32 val)
{
unsigned long flags;
raw_spin_lock_irqsave(&l2_access_lock, flags);
mb();
asm volatile ("mcr p15, 3, %[l2cpselr], c15, c0, 6\n\t"
"isb\n\t"
"mcr p15, 3, %[l2cpdr], c15, c0, 7\n\t"
"isb\n\t"
:
: [l2cpselr]"r" (reg_addr), [l2cpdr]"r" (val)
);
raw_spin_unlock_irqrestore(&l2_access_lock, flags);
}
EXPORT_SYMBOL(set_l2_indirect_reg);
u32 get_l2_indirect_reg(u32 reg_addr)
{
u32 val;
unsigned long flags;
raw_spin_lock_irqsave(&l2_access_lock, flags);
asm volatile ("mcr p15, 3, %[l2cpselr], c15, c0, 6\n\t"
"isb\n\t"
"mrc p15, 3, %[l2cpdr], c15, c0, 7\n\t"
: [l2cpdr]"=r" (val)
: [l2cpselr]"r" (reg_addr)
);
raw_spin_unlock_irqrestore(&l2_access_lock, flags);
return val;
}
EXPORT_SYMBOL(get_l2_indirect_reg);