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/*
* 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 <linux/io.h>
#include <asm/cacheflush.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 cache_wait(void __iomem *reg, unsigned long mask)
{
/* wait for the operation to complete */
while (readl(reg) & mask)
;
}
static inline void cache_sync(void)
{
void __iomem *base = l2x0_base;
writel(0, base + L2X0_CACHE_SYNC);
cache_wait(base + L2X0_CACHE_SYNC, 1);
}
static inline void l2x0_inv_all(void)
{
unsigned long flags;
/* invalidate all ways */
spin_lock_irqsave(&l2x0_lock, flags);
writel(0xff, l2x0_base + L2X0_INV_WAY);
cache_wait(l2x0_base + L2X0_INV_WAY, 0xff);
cache_sync();
spin_unlock_irqrestore(&l2x0_lock, flags);
}
static void l2x0_inv_range(unsigned long start, unsigned long end)
{
void __iomem *base = l2x0_base;
unsigned long flags;
spin_lock_irqsave(&l2x0_lock, flags);
if (start & (CACHE_LINE_SIZE - 1)) {
start &= ~(CACHE_LINE_SIZE - 1);
cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
writel(start, base + L2X0_CLEAN_INV_LINE_PA);
start += CACHE_LINE_SIZE;
}
if (end & (CACHE_LINE_SIZE - 1)) {
end &= ~(CACHE_LINE_SIZE - 1);
cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
writel(end, base + L2X0_CLEAN_INV_LINE_PA);
}
while (start < end) {
unsigned long blk_end = start + min(end - start, 4096UL);
while (start < blk_end) {
cache_wait(base + L2X0_INV_LINE_PA, 1);
writel(start, base + L2X0_INV_LINE_PA);
start += CACHE_LINE_SIZE;
}
if (blk_end < end) {
spin_unlock_irqrestore(&l2x0_lock, flags);
spin_lock_irqsave(&l2x0_lock, flags);
}
}
cache_wait(base + L2X0_INV_LINE_PA, 1);
cache_sync();
spin_unlock_irqrestore(&l2x0_lock, flags);
}
static void l2x0_clean_range(unsigned long start, unsigned long end)
{
void __iomem *base = l2x0_base;
unsigned long flags;
spin_lock_irqsave(&l2x0_lock, flags);
start &= ~(CACHE_LINE_SIZE - 1);
while (start < end) {
unsigned long blk_end = start + min(end - start, 4096UL);
while (start < blk_end) {
cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
writel(start, base + L2X0_CLEAN_LINE_PA);
start += CACHE_LINE_SIZE;
}
if (blk_end < end) {
spin_unlock_irqrestore(&l2x0_lock, flags);
spin_lock_irqsave(&l2x0_lock, flags);
}
}
cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
cache_sync();
spin_unlock_irqrestore(&l2x0_lock, flags);
}
static void l2x0_flush_range(unsigned long start, unsigned long end)
{
void __iomem *base = l2x0_base;
unsigned long flags;
spin_lock_irqsave(&l2x0_lock, flags);
start &= ~(CACHE_LINE_SIZE - 1);
while (start < end) {
unsigned long blk_end = start + min(end - start, 4096UL);
while (start < blk_end) {
cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
writel(start, base + L2X0_CLEAN_INV_LINE_PA);
start += CACHE_LINE_SIZE;
}
if (blk_end < end) {
spin_unlock_irqrestore(&l2x0_lock, flags);
spin_lock_irqsave(&l2x0_lock, flags);
}
}
cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
cache_sync();
spin_unlock_irqrestore(&l2x0_lock, flags);
}
void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
{
__u32 aux;
l2x0_base = base;
/*
* Check if l2x0 controller is already enabled.
* If you are booting from non-secure mode
* accessing the below registers will fault.
*/
if (!(readl(l2x0_base + L2X0_CTRL) & 1)) {
/* l2x0 controller is disabled */
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");
}
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