/*
* 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 uint32_t l2x0_way_mask; /* Bitmask of active ways */
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_clean_line(unsigned long addr)
{
void __iomem *base = l2x0_base;
cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
writel(addr, base + L2X0_CLEAN_LINE_PA);
}
static inline void l2x0_inv_line(unsigned long addr)
{
void __iomem *base = l2x0_base;
cache_wait(base + L2X0_INV_LINE_PA, 1);
writel(addr, base + L2X0_INV_LINE_PA);
}
#ifdef CONFIG_PL310_ERRATA_588369
static void debug_writel(unsigned long val)
{
extern void omap_smc1(u32 fn, u32 arg);
/*
* Texas Instrument secure monitor api to modify the
* PL310 Debug Control Register.
*/
omap_smc1(0x100, val);
}
static inline void l2x0_flush_line(unsigned long addr)
{
void __iomem *base = l2x0_base;
/* Clean by PA followed by Invalidate by PA */
cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
writel(addr, base + L2X0_CLEAN_LINE_PA);
cache_wait(base + L2X0_INV_LINE_PA, 1);
writel(addr, base + L2X0_INV_LINE_PA);
}
#else
/* Optimised out for non-errata case */
static inline void debug_writel(unsigned long val)
{
}
static inline void l2x0_flush_line(unsigned long addr)
{
void __iomem *base = l2x0_base;
cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
writel(addr, base + L2X0_CLEAN_INV_LINE_PA);
}
#endif
static void l2x0_cache_sync(void)
{
unsigned long flags;
spin_lock_irqsave(&l2x0_lock, flags);
cache_sync();
spin_unlock_irqrestore(&l2x0_lock, flags);
}
static inline void l2x0_inv_all(void)
{
unsigned long flags;
/* invalidate all ways */
spin_lock_irqsave(&l2x0_lock, flags);
writel(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
cache_wait(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
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);
debug_writel(0x03);
l2x0_flush_line(start);
debug_writel(0x00);
start += CACHE_LINE_SIZE;
}
if (end & (CACHE_LINE_SIZE - 1)) {
end &= ~(CACHE_LINE_SIZE - 1);
debug_writel(0x03);
l2x0_flush_line(end);
debug_writel(0x00);
}
while (start < end) {
unsigned long blk_end = start + min(end - start, 4096UL);
while (start < blk_end) {
l2x0_inv_line(start);
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) {
l2x0_clean_line(start);
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);
debug_writel(0x03);
while (start < blk_end) {
l2x0_flush_line(start);
start += CACHE_LINE_SIZE;
}
debug_writel(0x00);
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;
__u32 cache_id;
int ways;
const char *type;
l2x0_base = base;
cache_id = readl(l2x0_base + L2X0_CACHE_ID);
aux = readl(l2x0_base + L2X0_AUX_CTRL);
aux &= aux_mask;
aux |= aux_val;
/* Determine the number of ways */
switch (cache_id & L2X0_CACHE_ID_PART_MASK) {
case L2X0_CACHE_ID_PART_L310:
if (aux & (1 << 16))
ways = 16;
else
ways = 8;
type = "L310";
break;
case L2X0_CACHE_ID_PART_L210:
ways = (aux >> 13) & 0xf;
type = "L210";
break;
default:
/* Assume unknown chips have 8 ways */
ways = 8;
type = "L2x0 series";
break;
}
l2x0_way_mask = (1 << ways) - 1;
/*
* 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 */
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;
outer_cache.sync = l2x0_cache_sync;
printk(KERN_INFO "%s cache controller enabled\n", type);
printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x\n",
ways, cache_id, aux);
}
