108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
|
/*
|
||
|
|
* Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org),
|
||
|
|
* derived from r4xx0.c by David S. Miller (davem@davemloft.net).
|
||
|
|
*/
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
|
||
|
|
#include <asm/mipsregs.h>
|
||
|
|
#include <asm/bcache.h>
|
||
|
|
#include <asm/cacheops.h>
|
||
|
|
#include <asm/page.h>
|
||
|
|
#include <asm/pgtable.h>
|
||
|
|
#include <asm/mmu_context.h>
|
||
|
|
#include <asm/r4kcache.h>
|
||
|
|
|
||
|
|
/* Secondary cache size in bytes, if present. */
|
||
|
|
static unsigned long scache_size;
|
||
|
|
|
||
|
|
#define SC_LINE 32
|
||
|
|
#define SC_PAGE (128*SC_LINE)
|
||
|
|
|
||
|
|
static inline void blast_r5000_scache(void)
|
||
|
|
{
|
||
|
|
unsigned long start = INDEX_BASE;
|
||
|
|
unsigned long end = start + scache_size;
|
||
|
|
|
||
|
|
while(start < end) {
|
||
|
|
cache_op(R5K_Page_Invalidate_S, start);
|
||
|
|
start += SC_PAGE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r5k_dma_cache_inv_sc(unsigned long addr, unsigned long size)
|
||
|
|
{
|
||
|
|
unsigned long end, a;
|
||
|
|
|
||
|
|
/* Catch bad driver code */
|
||
|
|
BUG_ON(size == 0);
|
||
|
|
|
||
|
|
if (size >= scache_size) {
|
||
|
|
blast_r5000_scache();
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* On the R5000 secondary cache we cannot
|
||
|
|
* invalidate less than a page at a time.
|
||
|
|
* The secondary cache is physically indexed, write-through.
|
||
|
|
*/
|
||
|
|
a = addr & ~(SC_PAGE - 1);
|
||
|
|
end = (addr + size - 1) & ~(SC_PAGE - 1);
|
||
|
|
while (a <= end) {
|
||
|
|
cache_op(R5K_Page_Invalidate_S, a);
|
||
|
|
a += SC_PAGE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r5k_sc_enable(void)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
local_irq_save(flags);
|
||
|
|
set_c0_config(R5K_CONF_SE);
|
||
|
|
blast_r5000_scache();
|
||
|
|
local_irq_restore(flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r5k_sc_disable(void)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
local_irq_save(flags);
|
||
|
|
blast_r5000_scache();
|
||
|
|
clear_c0_config(R5K_CONF_SE);
|
||
|
|
local_irq_restore(flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int __init r5k_sc_probe(void)
|
||
|
|
{
|
||
|
|
unsigned long config = read_c0_config();
|
||
|
|
|
||
|
|
if (config & CONF_SC)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
scache_size = (512 * 1024) << ((config & R5K_CONF_SS) >> 20);
|
||
|
|
|
||
|
|
printk("R5000 SCACHE size %ldkB, linesize 32 bytes.\n",
|
||
|
|
scache_size >> 10);
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct bcache_ops r5k_sc_ops = {
|
||
|
|
.bc_enable = r5k_sc_enable,
|
||
|
|
.bc_disable = r5k_sc_disable,
|
||
|
|
.bc_wback_inv = r5k_dma_cache_inv_sc,
|
||
|
|
.bc_inv = r5k_dma_cache_inv_sc
|
||
|
|
};
|
||
|
|
|
||
|
|
void r5k_sc_init(void)
|
||
|
|
{
|
||
|
|
if (r5k_sc_probe()) {
|
||
|
|
r5k_sc_enable();
|
||
|
|
bcops = &r5k_sc_ops;
|
||
|
|
}
|
||
|
|
}
|