mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
0762097625
The background operations of the L2x0 cache controllers are aborted if another operation is issued on the same or different core. This patch protects the maintenance operation issuing/polling with a spinlock. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*
|
|
* arch/arm/mm/cache-l2x0.c - L210/L220 cache controller support
|
|
*
|
|
* Copyright (C) 2007 ARM Limited
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/io.h>
|
|
#include <asm/hardware/cache-l2x0.h>
|
|
|
|
#define CACHE_LINE_SIZE 32
|
|
|
|
static void __iomem *l2x0_base;
|
|
static DEFINE_SPINLOCK(l2x0_lock);
|
|
|
|
static inline void sync_writel(unsigned long val, unsigned long reg,
|
|
unsigned long complete_mask)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&l2x0_lock, flags);
|
|
writel(val, l2x0_base + reg);
|
|
/* wait for the operation to complete */
|
|
while (readl(l2x0_base + reg) & complete_mask)
|
|
;
|
|
spin_unlock_irqrestore(&l2x0_lock, flags);
|
|
}
|
|
|
|
static inline void cache_sync(void)
|
|
{
|
|
sync_writel(0, L2X0_CACHE_SYNC, 1);
|
|
}
|
|
|
|
static inline void l2x0_inv_all(void)
|
|
{
|
|
/* invalidate all ways */
|
|
sync_writel(0xff, L2X0_INV_WAY, 0xff);
|
|
cache_sync();
|
|
}
|
|
|
|
static void l2x0_inv_range(unsigned long start, unsigned long end)
|
|
{
|
|
unsigned long addr;
|
|
|
|
start &= ~(CACHE_LINE_SIZE - 1);
|
|
for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
|
|
sync_writel(addr, L2X0_INV_LINE_PA, 1);
|
|
cache_sync();
|
|
}
|
|
|
|
static void l2x0_clean_range(unsigned long start, unsigned long end)
|
|
{
|
|
unsigned long addr;
|
|
|
|
start &= ~(CACHE_LINE_SIZE - 1);
|
|
for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
|
|
sync_writel(addr, L2X0_CLEAN_LINE_PA, 1);
|
|
cache_sync();
|
|
}
|
|
|
|
static void l2x0_flush_range(unsigned long start, unsigned long end)
|
|
{
|
|
unsigned long addr;
|
|
|
|
start &= ~(CACHE_LINE_SIZE - 1);
|
|
for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
|
|
sync_writel(addr, L2X0_CLEAN_INV_LINE_PA, 1);
|
|
cache_sync();
|
|
}
|
|
|
|
void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
|
|
{
|
|
__u32 aux;
|
|
|
|
l2x0_base = base;
|
|
|
|
/* disable L2X0 */
|
|
writel(0, l2x0_base + L2X0_CTRL);
|
|
|
|
aux = readl(l2x0_base + L2X0_AUX_CTRL);
|
|
aux &= aux_mask;
|
|
aux |= aux_val;
|
|
writel(aux, l2x0_base + L2X0_AUX_CTRL);
|
|
|
|
l2x0_inv_all();
|
|
|
|
/* enable L2X0 */
|
|
writel(1, l2x0_base + L2X0_CTRL);
|
|
|
|
outer_cache.inv_range = l2x0_inv_range;
|
|
outer_cache.clean_range = l2x0_clean_range;
|
|
outer_cache.flush_range = l2x0_flush_range;
|
|
|
|
printk(KERN_INFO "L2X0 cache controller enabled\n");
|
|
}
|