a2c2bc4b26
Use blast_scache_range, blast_inv_scache_range for mips32/mips64 scache routine. Also initialize waybit for MIPS32/MIPS64 S-cache. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
113 lines
2.3 KiB
C
113 lines
2.3 KiB
C
/*
|
|
* Copyright (C) 2006 Chris Dearman (chris@mips.com),
|
|
*/
|
|
#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/system.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/r4kcache.h>
|
|
|
|
/*
|
|
* MIPS32/MIPS64 L2 cache handling
|
|
*/
|
|
|
|
/*
|
|
* Writeback and invalidate the secondary cache before DMA.
|
|
*/
|
|
static void mips_sc_wback_inv(unsigned long addr, unsigned long size)
|
|
{
|
|
blast_scache_range(addr, addr + size);
|
|
}
|
|
|
|
/*
|
|
* Invalidate the secondary cache before DMA.
|
|
*/
|
|
static void mips_sc_inv(unsigned long addr, unsigned long size)
|
|
{
|
|
blast_inv_scache_range(addr, addr + size);
|
|
}
|
|
|
|
static void mips_sc_enable(void)
|
|
{
|
|
/* L2 cache is permanently enabled */
|
|
}
|
|
|
|
static void mips_sc_disable(void)
|
|
{
|
|
/* L2 cache is permanently enabled */
|
|
}
|
|
|
|
static struct bcache_ops mips_sc_ops = {
|
|
.bc_enable = mips_sc_enable,
|
|
.bc_disable = mips_sc_disable,
|
|
.bc_wback_inv = mips_sc_wback_inv,
|
|
.bc_inv = mips_sc_inv
|
|
};
|
|
|
|
static inline int __init mips_sc_probe(void)
|
|
{
|
|
struct cpuinfo_mips *c = ¤t_cpu_data;
|
|
unsigned int config1, config2;
|
|
unsigned int tmp;
|
|
|
|
/* Mark as not present until probe completed */
|
|
c->scache.flags |= MIPS_CACHE_NOT_PRESENT;
|
|
|
|
/* Ignore anything but MIPSxx processors */
|
|
if (c->isa_level != MIPS_CPU_ISA_M32R1 &&
|
|
c->isa_level != MIPS_CPU_ISA_M32R2 &&
|
|
c->isa_level != MIPS_CPU_ISA_M64R1 &&
|
|
c->isa_level != MIPS_CPU_ISA_M64R2)
|
|
return 0;
|
|
|
|
/* Does this MIPS32/MIPS64 CPU have a config2 register? */
|
|
config1 = read_c0_config1();
|
|
if (!(config1 & MIPS_CONF_M))
|
|
return 0;
|
|
|
|
config2 = read_c0_config2();
|
|
tmp = (config2 >> 4) & 0x0f;
|
|
if (0 < tmp && tmp <= 7)
|
|
c->scache.linesz = 2 << tmp;
|
|
else
|
|
return 0;
|
|
|
|
tmp = (config2 >> 8) & 0x0f;
|
|
if (0 <= tmp && tmp <= 7)
|
|
c->scache.sets = 64 << tmp;
|
|
else
|
|
return 0;
|
|
|
|
tmp = (config2 >> 0) & 0x0f;
|
|
if (0 <= tmp && tmp <= 7)
|
|
c->scache.ways = tmp + 1;
|
|
else
|
|
return 0;
|
|
|
|
c->scache.waysize = c->scache.sets * c->scache.linesz;
|
|
c->scache.waybit = __ffs(c->scache.waysize);
|
|
|
|
c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int __init mips_sc_init(void)
|
|
{
|
|
int found = mips_sc_probe ();
|
|
if (found) {
|
|
mips_sc_enable();
|
|
bcops = &mips_sc_ops;
|
|
}
|
|
return found;
|
|
}
|
|
|