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/*
* (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
* (C) Copyright 2011, Julius Baxter <julius@opencores.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* 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 <common.h>
#include <init.h>
#include <asm/system.h>
void flush_dcache_range(unsigned long addr, unsigned long stop)
{
ulong block_size = (mfspr(SPR_DCCFGR) & SPR_DCCFGR_CBS) ? 32 : 16;
while (addr < stop) {
mtspr(SPR_DCBFR, addr);
addr += block_size;
}
}
void invalidate_dcache_range(unsigned long addr, unsigned long stop)
{
ulong block_size = (mfspr(SPR_DCCFGR) & SPR_DCCFGR_CBS) ? 32 : 16;
while (addr < stop) {
mtspr(SPR_DCBIR, addr);
addr += block_size;
}
}
static void invalidate_icache_range(unsigned long addr, unsigned long stop)
{
ulong block_size = (mfspr(SPR_ICCFGR) & SPR_ICCFGR_CBS) ? 32 : 16;
while (addr < stop) {
mtspr(SPR_ICBIR, addr);
addr += block_size;
}
}
void flush_cache(unsigned long addr, unsigned long size)
{
flush_dcache_range(addr, addr + size);
invalidate_icache_range(addr, addr + size);
}
int icache_status(void)
{
return mfspr(SPR_SR) & SPR_SR_ICE;
}
int checkicache(void)
{
unsigned long iccfgr;
unsigned long cache_set_size;
unsigned long cache_ways;
unsigned long cache_block_size;
iccfgr = mfspr(SPR_ICCFGR);
cache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
cache_block_size = (iccfgr & SPR_ICCFGR_CBS) ? 32 : 16;
return cache_set_size * cache_ways * cache_block_size;
}
int dcache_status(void)
{
return mfspr(SPR_SR) & SPR_SR_DCE;
}
int checkdcache(void)
{
unsigned long dccfgr;
unsigned long cache_set_size;
unsigned long cache_ways;
unsigned long cache_block_size;
dccfgr = mfspr(SPR_DCCFGR);
cache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
cache_block_size = (dccfgr & SPR_DCCFGR_CBS) ? 32 : 16;
return cache_set_size * cache_ways * cache_block_size;
}
void dcache_enable(void)
{
mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_DCE);
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
}
void dcache_disable(void)
{
mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_DCE);
}
void icache_enable(void)
{
mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_ICE);
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
}
void icache_disable(void)
{
mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_ICE);
}
int cache_init(void)
{
if (mfspr(SPR_UPR) & SPR_UPR_ICP) {
icache_disable();
invalidate_icache_range(0, checkicache());
icache_enable();
}
if (mfspr(SPR_UPR) & SPR_UPR_DCP) {
dcache_disable();
invalidate_dcache_range(0, checkdcache());
dcache_enable();
}
return 0;
}
core_initcall(cache_init);
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