/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
* Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@gnu.org)
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/bitops.h>
#include <asm/bcache.h>
#include <asm/bootinfo.h>
#include <asm/cache.h>
#include <asm/cacheops.h>
#include <asm/cpu.h>
#include <asm/cpu-features.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/r4kcache.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/war.h>
#include <asm/cacheflush.h> /* for run_uncached() */
/*
* Must die.
*/
static unsigned long icache_size __read_mostly;
static unsigned long dcache_size __read_mostly;
static unsigned long scache_size __read_mostly;
/*
* Dummy cache handling routines for machines without boardcaches
*/
static void no_sc_noop(void) {}
static struct bcache_ops no_sc_ops = {
.bc_enable = (void *)no_sc_noop,
.bc_disable = (void *)no_sc_noop,
.bc_wback_inv = (void *)no_sc_noop,
.bc_inv = (void *)no_sc_noop
};
struct bcache_ops *bcops = &no_sc_ops;
#define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
#define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
#define R4600_HIT_CACHEOP_WAR_IMPL \
do { \
if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) \
*(volatile unsigned long *)CKSEG1; \
if (R4600_V1_HIT_CACHEOP_WAR) \
__asm__ __volatile__("nop;nop;nop;nop"); \
} while (0)
static void (*r4k_blast_dcache_page)(unsigned long addr);
static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
{
R4600_HIT_CACHEOP_WAR_IMPL;
blast_dcache32_page(addr);
}
static inline void r4k_blast_dcache_page_setup(void)
{
unsigned long dc_lsize = cpu_dcache_line_size();
if (dc_lsize == 16)
r4k_blast_dcache_page = blast_dcache16_page;
else if (dc_lsize == 32)
r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
}
static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
static inline void r4k_blast_dcache_page_indexed_setup(void)
{
unsigned long dc_lsize = cpu_dcache_line_size();
if (dc_lsize == 16)
r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
else if (dc_lsize == 32)
r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
}
static void (* r4k_blast_dcache)(void);
static inline void r4k_blast_dcache_setup(void)
{
unsigned long dc_lsize = cpu_dcache_line_size();
if (dc_lsize == 16)
r4k_blast_dcache = blast_dcache16;
else if (dc_lsize == 32)
r4k_blast_dcache = blast_dcache32;
}
/* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
#define JUMP_TO_ALIGN(order) \
__asm__ __volatile__( \
"b\t1f\n\t" \
".align\t" #order "\n\t" \
"1:\n\t" \
)
#define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
#define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
static inline void blast_r4600_v1_icache32(void)
{
unsigned long flags;
local_irq_save(flags);
blast_icache32();
local_irq_restore(flags);
}
static inline void tx49_blast_icache32(void)
{
unsigned long start = INDEX_BASE;
unsigned long end = start + current_cpu_data.icache.waysize;
unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
unsigned long ws_end = current_cpu_data.icache.ways <<
current_cpu_data.icache.waybit;
unsigned long ws, addr;
CACHE32_UNROLL32_ALIGN2;
/* I'm in even chunk. blast odd chunks */
for (ws = 0; ws < ws_end; ws += ws_inc)
for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
cache32_unroll32(addr|ws,Index_Invalidate_I);
CACHE32_UNROLL32_ALIGN;
/* I'm in odd chunk. blast even chunks */
for (ws = 0; ws < ws_end; ws += ws_inc)
for (addr = start; addr < end; addr += 0x400 * 2)
cache32_unroll32(addr|ws,Index_Invalidate_I);
}
static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
{
unsigned long flags;
local_irq_save(flags);
blast_icache32_page_indexed(page);
local_irq_restore(flags);
}
static inline void tx49_blast_icache32_page_indexed(unsigned long page)
{
unsigned long start = page;
unsigned long end = start + PAGE_SIZE;
unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
unsigned long ws_end = current_cpu_data.icache.ways <<
current_cpu_data.icache.waybit;
unsigned long ws, addr;
CACHE32_UNROLL32_ALIGN2;
/* I'm in even chunk. blast odd chunks */
for (ws = 0; ws < ws_end; ws += ws_inc)
for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
cache32_unroll32(addr|ws,Index_Invalidate_I);
CACHE32_UNROLL32_ALIGN;
/* I'm in odd chunk. blast even chunks */
for (ws = 0; ws < ws_end; ws += ws_inc)
for (addr = start; addr < end; addr += 0x400 * 2)
cache32_unroll32(addr|ws,Index_Invalidate_I);
}
static void (* r4k_blast_icache_page)(unsigned long addr);
static inline void r4k_blast_icache_page_setup(void)
{
unsigned long ic_lsize = cpu_icache_line_size();
if (ic_lsize == 16)
r4k_blast_icache_page = blast_icache16_page;
else if (ic_lsize == 32)
r4k_blast_icache_page = blast_icache32_page;
else if (ic_lsize == 64)
r4k_blast_icache_page = blast_icache64_page;
}
static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
static inline void r4k_blast_icache_page_indexed_setup(void)
{
unsigned long ic_lsize = cpu_icache_line_size();
if (ic_lsize == 16)
r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
else if (ic_lsize == 32) {
if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
r4k_blast_icache_page_indexed =
blast_icache32_r4600_v1_page_indexed;
else if (TX49XX_ICACHE_INDEX_INV_WAR)
r4k_blast_icache_page_indexed =
tx49_blast_icache32_page_indexed;
else
r4k_blast_icache_page_indexed =
blast_icache32_page_indexed;
} else if (ic_lsize == 64)
r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
}
static void (* r4k_blast_icache)(void);
static inline void r4k_blast_icache_setup(void)
{
unsigned long ic_lsize = cpu_icache_line_size();
if (ic_lsize == 16)
r4k_blast_icache = blast_icache16;
else if (ic_lsize == 32) {
if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
r4k_blast_icache = blast_r4600_v1_icache32;
else if (TX49XX_ICACHE_INDEX_INV_WAR)
r4k_blast_icache = tx49_blast_icache32;
else
r4k_blast_icache = blast_icache32;
} else if (ic_lsize == 64)
r4k_blast_icache = blast_icache64;
}
static void (* r4k_blast_scache_page)(unsigned long addr);
static inline void r4k_blast_scache_page_setup(void)
{
unsigned long sc_lsize = cpu_scache_line_size();
if (scache_size == 0)
r4k_blast_scache_page = (void *)no_sc_noop;
else if (sc_lsize == 16)
r4k_blast_scache_page = blast_scache16_page;
else if (sc_lsize == 32)
r4k_blast_scache_page = blast_scache32_page;
else if (sc_lsize == 64)
r4k_blast_scache_page = blast_scache64_page;
else if (sc_lsize == 128)
r4k_blast_scache_page = blast_scache128_page;
}
static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
static inline void r4k_blast_scache_page_indexed_setup(void)
{
unsigned long sc_lsize = cpu_scache_line_size();
if (scache_size == 0)
r4k_blast_scache_page_indexed = (void *)no_sc_noop;
else if (sc_lsize == 16)
r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
else if (sc_lsize == 32)
r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
else if (sc_lsize == 64)
r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
else if (sc_lsize == 128)
r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
}
static void (* r4k_blast_scache)(void);
static inline void r4k_blast_scache_setup(void)
{
unsigned long sc_lsize = cpu_scache_line_size();
if (scache_size == 0)
r4k_blast_scache = (void *)no_sc_noop;
else if (sc_lsize == 16)
r4k_blast_scache = blast_scache16;
else if (sc_lsize == 32)
r4k_blast_scache = blast_scache32;
else if (sc_lsize == 64)
r4k_blast_scache = blast_scache64;
else if (sc_lsize == 128)
r4k_blast_scache = blast_scache128;
}
/*
* This is former mm's flush_cache_all() which really should be
* flush_cache_vunmap these days ...
*/
static inline void local_r4k_flush_cache_all(void * args)
{
r4k_blast_dcache();
r4k_blast_icache();
}
static void r4k_flush_cache_all(void)
{
if (!cpu_has_dc_aliases)
return;
on_each_cpu(local_r4k_flush_cache_all, NULL, 1, 1);
}
static inline void local_r4k___flush_cache_all(void * args)
{
r4k_blast_dcache();
r4k_blast_icache();
switch (current_cpu_data.cputype) {
case CPU_R4000SC:
case CPU_R4000MC:
case CPU_R4400SC:
case CPU_R4400MC:
case CPU_R10000:
case CPU_R12000:
r4k_blast_scache();
}
}
static void r4k___flush_cache_all(void)
{
on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1);
}
static inline void local_r4k_flush_cache_range(void * args)
{
struct vm_area_struct *vma = args;
int exec;
if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
return;
exec = vma->vm_flags & VM_EXEC;
if (cpu_has_dc_aliases || exec)
r4k_blast_dcache();
if (exec)
r4k_blast_icache();
}
static void r4k_flush_cache_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1);
}
static inline void local_r4k_flush_cache_mm(void * args)
{
struct mm_struct *mm = args;
if (!cpu_context(smp_processor_id(), mm))
return;
r4k_blast_dcache();
r4k_blast_icache();
/*
* Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we
* only flush the primary caches but R10000 and R12000 behave sane ...
*/
if (current_cpu_data.cputype == CPU_R4000SC ||
current_cpu_data.cputype == CPU_R4000MC ||
current_cpu_data.cputype == CPU_R4400SC ||
current_cpu_data.cputype == CPU_R4400MC)
r4k_blast_scache();
}
static void r4k_flush_cache_mm(struct mm_struct *mm)
{
if (!cpu_has_dc_aliases)
return;
on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1);
}
struct flush_cache_page_args {
struct vm_area_struct *vma;
unsigned long addr;
unsigned long pfn;
};
static inline void local_r4k_flush_cache_page(void *args)
{
struct flush_cache_page_args *fcp_args = args;
struct vm_area_struct *vma = fcp_args->vma;
unsigned long addr = fcp_args->addr;
unsigned long paddr = fcp_args->pfn << PAGE_SHIFT;
int exec = vma->vm_flags & VM_EXEC;
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgdp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
/*
* If ownes no valid ASID yet, cannot possibly have gotten
* this page into the cache.
*/
if (cpu_context(smp_processor_id(), mm) == 0)
return;
addr &= PAGE_MASK;
pgdp = pgd_offset(mm, addr);
pudp = pud_offset(pgdp, addr);
pmdp = pmd_offset(pudp, addr);
ptep = pte_offset(pmdp, addr);
/*
* If the page isn't marked valid, the page cannot possibly be
* in the cache.
*/
if (!(pte_val(*ptep) & _PAGE_PRESENT))
return;
/*
* Doing flushes for another ASID than the current one is
* too difficult since stupid R4k caches do a TLB translation
* for every cache flush operation. So we do indexed flushes
* in that case, which doesn't overly flush the cache too much.
*/
if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
r4k_blast_dcache_page(addr);
if (exec && !cpu_icache_snoops_remote_store)
r4k_blast_scache_page(addr);
}
if (exec)
r4k_blast_icache_page(addr);
return;
}
/*
* Do indexed flush, too much work to get the (possible) TLB refills
* to work correctly.
*/
if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
r4k_blast_dcache_page_indexed(cpu_has_pindexed_dcache ?
paddr : addr);
if (exec && !cpu_icache_snoops_remote_store) {
r4k_blast_scache_page_indexed(paddr);
}
}
if (exec) {
if (cpu_has_vtag_icache) {
int cpu = smp_processor_id();
if (cpu_context(cpu, mm) != 0)
drop_mmu_context(mm, cpu);
} else
r4k_blast_icache_page_indexed(addr);
}
}
static void r4k_flush_cache_page(struct vm_area_struct *vma,
unsigned long addr, unsigned long pfn)
{
struct flush_cache_page_args args;
args.vma = vma;
args.addr = addr;
args.pfn = pfn;
on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
}
static inline void local_r4k_flush_data_cache_page(void * addr)
{
r4k_blast_dcache_page((unsigned long) addr);
}
static void r4k_flush_data_cache_page(unsigned long addr)
{
on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr, 1, 1);
}
struct flush_icache_range_args {
unsigned long start;
unsigned long end;
};
static inline void local_r4k_flush_icache_range(void *args)
{
struct flush_icache_range_args *fir_args = args;
unsigned long start = fir_args->start;
unsigned long end = fir_args->end;
if (!cpu_has_ic_fills_f_dc) {
if (end - start > dcache_size) {
r4k_blast_dcache();
} else {
R4600_HIT_CACHEOP_WAR_IMPL;
protected_blast_dcache_range(start, end);
}
if (!cpu_icache_snoops_remote_store && scache_size) {
if (end - start > scache_size)
r4k_blast_scache();
else
protected_blast_scache_range(start, end);
}
}
if (end - start > icache_size)
r4k_blast_icache();
else
protected_blast_icache_range(start, end);
}
static void r4k_flush_icache_range(unsigned long start, unsigned long end)
{
struct flush_icache_range_args args;
args.start = start;
args.end = end;
on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1);
instruction_hazard();
}
/*
* Ok, this seriously sucks. We use them to flush a user page but don't
* know the virtual address, so we have to blast away the whole icache
* which is significantly more expensive than the real thing. Otoh we at
* least know the kernel address of the page so we can flush it
* selectivly.
*/
struct flush_icache_page_args {
struct vm_area_struct *vma;
struct page *page;
};
static inline void local_r4k_flush_icache_page(void *args)
{
struct flush_icache_page_args *fip_args = args;
struct vm_area_struct *vma = fip_args->vma;
struct page *page = fip_args->page;
/*
* Tricky ... Because we don't know the virtual address we've got the
* choice of either invalidating the entire primary and secondary
* caches or invalidating the secondary caches also. With the subset
* enforcment on R4000SC, R4400SC, R10000 and R12000 invalidating the
* secondary cache will result in any entries in the primary caches
* also getting invalidated which hopefully is a bit more economical.
*/
if (cpu_has_subset_pcaches) {
unsigned long addr = (unsigned long) page_address(page);
r4k_blast_scache_page(addr);
ClearPageDcacheDirty(page);
return;
}
if (!cpu_has_ic_fills_f_dc) {
unsigned long addr = (unsigned long) page_address(page);
r4k_blast_dcache_page(addr);
if (!cpu_icache_snoops_remote_store)
r4k_blast_scache_page(addr);
ClearPageDcacheDirty(page);
}
/*
* We're not sure of the virtual address(es) involved here, so
* we have to flush the entire I-cache.
*/
if (cpu_has_vtag_icache) {
int cpu = smp_processor_id();
if (cpu_context(cpu, vma->vm_mm) != 0)
drop_mmu_context(vma->vm_mm, cpu);
} else
r4k_blast_icache();
}
static void r4k_flush_icache_page(struct vm_area_struct *vma,
struct page *page)
{
struct flush_icache_page_args args;
/*
* If there's no context yet, or the page isn't executable, no I-cache
* flush is needed.
*/
if (!(vma->vm_flags & VM_EXEC))
return;
args.vma = vma;
args.page = page;
on_each_cpu(local_r4k_flush_icache_page, &args, 1, 1);
}
#ifdef CONFIG_DMA_NONCOHERENT
static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
{
/* Catch bad driver code */
BUG_ON(size == 0);
if (cpu_has_subset_pcaches) {
if (size >= scache_size)
r4k_blast_scache();
else
blast_scache_range(addr, addr + size);
return;
}
/*
* Either no secondary cache or the available caches don't have the
* subset property so we have to flush the primary caches
* explicitly
*/
if (size >= dcache_size) {
r4k_blast_dcache();
} else {
R4600_HIT_CACHEOP_WAR_IMPL;
blast_dcache_range(addr, addr + size);
}
bc_wback_inv(addr, size);
}
static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
{
/* Catch bad driver code */
BUG_ON(size == 0);
if (cpu_has_subset_pcaches) {
if (size >= scache_size)
r4k_blast_scache();
else
blast_scache_range(addr, addr + size);
return;
}
if (size >= dcache_size) {
r4k_blast_dcache();
} else {
R4600_HIT_CACHEOP_WAR_IMPL;
blast_dcache_range(addr, addr + size);
}
bc_inv(addr, size);
}
#endif /* CONFIG_DMA_NONCOHERENT */
/*
* While we're protected against bad userland addresses we don't care
* very much about what happens in that case. Usually a segmentation
* fault will dump the process later on anyway ...
*/
static void local_r4k_flush_cache_sigtramp(void * arg)
{
unsigned long ic_lsize = cpu_icache_line_size();
unsigned long dc_lsize = cpu_dcache_line_size();
unsigned long sc_lsize = cpu_scache_line_size();
unsigned long addr = (unsigned long) arg;
R4600_HIT_CACHEOP_WAR_IMPL;
protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
if (!cpu_icache_snoops_remote_store && scache_size)
protected_writeback_scache_line(addr & ~(sc_lsize - 1));
protected_flush_icache_line(addr & ~(ic_lsize - 1));
if (MIPS4K_ICACHE_REFILL_WAR) {
__asm__ __volatile__ (
".set push\n\t"
".set noat\n\t"
".set mips3\n\t"
#ifdef CONFIG_32BIT
"la $at,1f\n\t"
#endif
#ifdef CONFIG_64BIT
"dla $at,1f\n\t"
#endif
"cache %0,($at)\n\t"
"nop; nop; nop\n"
"1:\n\t"
".set pop"
:
: "i" (Hit_Invalidate_I));
}
if (MIPS_CACHE_SYNC_WAR)
__asm__ __volatile__ ("sync");
}
static void r4k_flush_cache_sigtramp(unsigned long addr)
{
on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1);
}
static void r4k_flush_icache_all(void)
{
if (cpu_has_vtag_icache)
r4k_blast_icache();
}
static inline void rm7k_erratum31(void)
{
const unsigned long ic_lsize = 32;
unsigned long addr;
/* RM7000 erratum #31. The icache is screwed at startup. */
write_c0_taglo(0);
write_c0_taghi(0);
for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
__asm__ __volatile__ (
".set push\n\t"
".set noreorder\n\t"
".set mips3\n\t"
"cache\t%1, 0(%0)\n\t"
"cache\t%1, 0x1000(%0)\n\t"
"cache\t%1, 0x2000(%0)\n\t"
"cache\t%1, 0x3000(%0)\n\t"
"cache\t%2, 0(%0)\n\t"
"cache\t%2, 0x1000(%0)\n\t"
"cache\t%2, 0x2000(%0)\n\t"
"cache\t%2, 0x3000(%0)\n\t"
"cache\t%1, 0(%0)\n\t"
"cache\t%1, 0x1000(%0)\n\t"
"cache\t%1, 0x2000(%0)\n\t"
"cache\t%1, 0x3000(%0)\n\t"
".set pop\n"
:
: "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
}
}
static char *way_string[] __initdata = { NULL, "direct mapped", "2-way",
"3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
};
static void __init probe_pcache(void)
{
struct cpuinfo_mips *c = ¤t_cpu_data;
unsigned int config = read_c0_config();
unsigned int prid = read_c0_prid();
unsigned long config1;
unsigned int lsize;
switch (c->cputype) {
case CPU_R4600: /* QED style two way caches? */
case CPU_R4700:
case CPU_R5000:
case CPU_NEVADA:
icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 2;
c->icache.waybit = ffs(icache_size/2) - 1;
dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 2;
c->dcache.waybit= ffs(dcache_size/2) - 1;
c->options |= MIPS_CPU_CACHE_CDEX_P;
break;
case CPU_R5432:
case CPU_R5500:
icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 2;
c->icache.waybit= 0;
dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 2;
c->dcache.waybit = 0;
c->options |= MIPS_CPU_CACHE_CDEX_P;
break;
case CPU_TX49XX:
icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 4;
c->icache.waybit= 0;
dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 4;
c->dcache.waybit = 0;
c->options |= MIPS_CPU_CACHE_CDEX_P;
c->options |= MIPS_CPU_PREFETCH;
break;
case CPU_R4000PC:
case CPU_R4000SC:
case CPU_R4000MC:
case CPU_R4400PC:
case CPU_R4400SC:
case CPU_R4400MC:
case CPU_R4300:
icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 1;
c->icache.waybit = 0; /* doesn't matter */
dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 1;
c->dcache.waybit = 0; /* does not matter */
c->options |= MIPS_CPU_CACHE_CDEX_P;
break;
case CPU_R10000:
case CPU_R12000:
icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
c->icache.linesz = 64;
c->icache.ways = 2;
c->icache.waybit = 0;
dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
c->dcache.linesz = 32;
c->dcache.ways = 2;
c->dcache.waybit = 0;
c->options |= MIPS_CPU_PREFETCH;
break;
case CPU_VR4133:
write_c0_config(config & ~CONF_EB);
case CPU_VR4131:
/* Workaround for cache instruction bug of VR4131 */
if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
c->processor_id == 0x0c82U) {
config &= ~0x00000030U;
config |= 0x00410000U;
write_c0_config(config);
}
icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 2;
c->icache.waybit = ffs(icache_size/2) - 1;
dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 2;
c->dcache.waybit = ffs(dcache_size/2) - 1;
c->options |= MIPS_CPU_CACHE_CDEX_P;
break;
case CPU_VR41XX:
case CPU_VR4111:
case CPU_VR4121:
case CPU_VR4122:
case CPU_VR4181:
case CPU_VR4181A:
icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 1;
c->icache.waybit = 0; /* doesn't matter */
dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 1;
c->dcache.waybit = 0; /* does not matter */
c->options |= MIPS_CPU_CACHE_CDEX_P;
break;
case CPU_RM7000:
rm7k_erratum31();
case CPU_RM9000:
icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 4;
c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 4;
c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
#if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
c->options |= MIPS_CPU_CACHE_CDEX_P;
#endif
c->options |= MIPS_CPU_PREFETCH;
break;
default:
if (!(config & MIPS_CONF_M))
panic("Don't know how to probe P-caches on this cpu.");
/*
* So we seem to be a MIPS32 or MIPS64 CPU
* So let's probe the I-cache ...
*/
config1 = read_c0_config1();
if ((lsize = ((config1 >> 19) & 7)))
c->icache.linesz = 2 << lsize;
else
c->icache.linesz = lsize;
c->icache.sets = 64 << ((config1 >> 22) & 7);
c->icache.ways = 1 + ((config1 >> 16) & 7);
icache_size = c->icache.sets *
c->icache.ways *
c->icache.linesz;
c->icache.waybit = ffs(icache_size/c->icache.ways) - 1;
if (config & 0x8) /* VI bit */
c->icache.flags |= MIPS_CACHE_VTAG;
/*
* Now probe the MIPS32 / MIPS64 data cache.
*/
c->dcache.flags = 0;
if ((lsize = ((config1 >> 10) & 7)))
c->dcache.linesz = 2 << lsize;
else
c->dcache.linesz= lsize;
c->dcache.sets = 64 << ((config1 >> 13) & 7);
c->dcache.ways = 1 + ((config1 >> 7) & 7);
dcache_size = c->dcache.sets *
c->dcache.ways *
c->dcache.linesz;
c->dcache.waybit = ffs(dcache_size/c->dcache.ways) - 1;
c->options |= MIPS_CPU_PREFETCH;
break;
}
/*
* Processor configuration sanity check for the R4000SC erratum
* #5. With page sizes larger than 32kB there is no possibility
* to get a VCE exception anymore so we don't care about this
* misconfiguration. The case is rather theoretical anyway;
* presumably no vendor is shipping his hardware in the "bad"
* configuration.
*/
if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
!(config & CONF_SC) && c->icache.linesz != 16 &&
PAGE_SIZE <= 0x8000)
panic("Improper R4000SC processor configuration detected");
/* compute a couple of other cache variables */
c->icache.waysize = icache_size / c->icache.ways;
c->dcache.waysize = dcache_size / c->dcache.ways;
c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
/*
* R10000 and R12000 P-caches are odd in a positive way. They're 32kB
* 2-way virtually indexed so normally would suffer from aliases. So
* normally they'd suffer from aliases but magic in the hardware deals
* with that for us so we don't need to take care ourselves.
*/
switch (c->cputype) {
case CPU_20KC:
case CPU_25KF:
c->dcache.flags |= MIPS_CACHE_PINDEX;
case CPU_R10000:
case CPU_R12000:
case CPU_SB1:
break;
case CPU_24K:
if (!(read_c0_config7() & (1 << 16)))
default:
if (c->dcache.waysize > PAGE_SIZE)
c->dcache.flags |= MIPS_CACHE_ALIASES;
}
switch (c->cputype) {
case CPU_20KC:
/*
* Some older 20Kc chips doesn't have the 'VI' bit in
* the config register.
*/
c->icache.flags |= MIPS_CACHE_VTAG;
break;
case CPU_AU1000:
case CPU_AU1500:
case CPU_AU1100:
case CPU_AU1550:
case CPU_AU1200:
c->icache.flags |= MIPS_CACHE_IC_F_DC;
break;
}
printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
icache_size >> 10,
cpu_has_vtag_icache ? "virtually tagged" : "physically tagged",
way_string[c->icache.ways], c->icache.linesz);
printk("Primary data cache %ldkB, %s, linesize %d bytes.\n",
dcache_size >> 10, way_string[c->dcache.ways], c->dcache.linesz);
}
/*
* If you even _breathe_ on this function, look at the gcc output and make sure
* it does not pop things on and off the stack for the cache sizing loop that
* executes in KSEG1 space or else you will crash and burn badly. You have
* been warned.
*/
static int __init probe_scache(void)
{
extern unsigned long stext;
unsigned long flags, addr, begin, end, pow2;
unsigned int config = read_c0_config();
struct cpuinfo_mips *c = ¤t_cpu_data;
int tmp;
if (config & CONF_SC)
return 0;
begin = (unsigned long) &stext;
begin &= ~((4 * 1024 * 1024) - 1);
end = begin + (4 * 1024 * 1024);
/*
* This is such a bitch, you'd think they would make it easy to do
* this. Away you daemons of stupidity!
*/
local_irq_save(flags);
/* Fill each size-multiple cache line with a valid tag. */
pow2 = (64 * 1024);
for (addr = begin; addr < end; addr = (begin + pow2)) {
unsigned long *p = (unsigned long *) addr;
__asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
pow2 <<= 1;
}
/* Load first line with zero (therefore invalid) tag. */
write_c0_taglo(0);
write_c0_taghi(0);
__asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
cache_op(Index_Store_Tag_I, begin);
cache_op(Index_Store_Tag_D, begin);
cache_op(Index_Store_Tag_SD, begin);
/* Now search for the wrap around point. */
pow2 = (128 * 1024);
tmp = 0;
for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
cache_op(Index_Load_Tag_SD, addr);
__asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
if (!read_c0_taglo())
break;
pow2 <<= 1;
}
local_irq_restore(flags);
addr -= begin;
scache_size = addr;
c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
c->scache.ways = 1;
c->dcache.waybit = 0; /* does not matter */
return 1;
}
extern int r5k_sc_init(void);
extern int rm7k_sc_init(void);
static void __init setup_scache(void)
{
struct cpuinfo_mips *c = ¤t_cpu_data;
unsigned int config = read_c0_config();
int sc_present = 0;
/*
* Do the probing thing on R4000SC and R4400SC processors. Other
* processors don't have a S-cache that would be relevant to the
* Linux memory managment.
*/
switch (c->cputype) {
case CPU_R4000SC:
case CPU_R4000MC:
case CPU_R4400SC:
case CPU_R4400MC:
sc_present = run_uncached(probe_scache);
if (sc_present)
c->options |= MIPS_CPU_CACHE_CDEX_S;
break;
case CPU_R10000:
case CPU_R12000:
scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
c->scache.linesz = 64 << ((config >> 13) & 1);
c->scache.ways = 2;
c->scache.waybit= 0;
sc_present = 1;
break;
case CPU_R5000:
case CPU_NEVADA:
#ifdef CONFIG_R5000_CPU_SCACHE
r5k_sc_init();
#endif
return;
case CPU_RM7000:
case CPU_RM9000:
#ifdef CONFIG_RM7000_CPU_SCACHE
rm7k_sc_init();
#endif
return;
default:
sc_present = 0;
}
if (!sc_present)
return;
if ((c->isa_level == MIPS_CPU_ISA_M32R1 ||
c->isa_level == MIPS_CPU_ISA_M64R1) &&
!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
/* compute a couple of other cache variables */
c->scache.waysize = scache_size / c->scache.ways;
c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
c->options |= MIPS_CPU_SUBSET_CACHES;
}
static inline void coherency_setup(void)
{
change_c0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
/*
* c0_status.cu=0 specifies that updates by the sc instruction use
* the coherency mode specified by the TLB; 1 means cachable
* coherent update on write will be used. Not all processors have
* this bit and; some wire it to zero, others like Toshiba had the
* silly idea of putting something else there ...
*/
switch (current_cpu_data.cputype) {
case CPU_R4000PC:
case CPU_R4000SC:
case CPU_R4000MC:
case CPU_R4400PC:
case CPU_R4400SC:
case CPU_R4400MC:
clear_c0_config(CONF_CU);
break;
}
}
void __init r4k_cache_init(void)
{
extern void build_clear_page(void);
extern void build_copy_page(void);
extern char except_vec2_generic;
struct cpuinfo_mips *c = ¤t_cpu_data;
/* Default cache error handler for R4000 and R5000 family */
set_uncached_handler (0x100, &except_vec2_generic, 0x80);
probe_pcache();
setup_scache();
r4k_blast_dcache_page_setup();
r4k_blast_dcache_page_indexed_setup();
r4k_blast_dcache_setup();
r4k_blast_icache_page_setup();
r4k_blast_icache_page_indexed_setup();
r4k_blast_icache_setup();
r4k_blast_scache_page_setup();
r4k_blast_scache_page_indexed_setup();
r4k_blast_scache_setup();
/*
* Some MIPS32 and MIPS64 processors have physically indexed caches.
* This code supports virtually indexed processors and will be
* unnecessarily inefficient on physically indexed processors.
*/
shm_align_mask = max_t( unsigned long,
c->dcache.sets * c->dcache.linesz - 1,
PAGE_SIZE - 1);
flush_cache_all = r4k_flush_cache_all;
__flush_cache_all = r4k___flush_cache_all;
flush_cache_mm = r4k_flush_cache_mm;
flush_cache_page = r4k_flush_cache_page;
flush_icache_page = r4k_flush_icache_page;
flush_cache_range = r4k_flush_cache_range;
flush_cache_sigtramp = r4k_flush_cache_sigtramp;
flush_icache_all = r4k_flush_icache_all;
flush_data_cache_page = r4k_flush_data_cache_page;
flush_icache_range = r4k_flush_icache_range;
#ifdef CONFIG_DMA_NONCOHERENT
_dma_cache_wback_inv = r4k_dma_cache_wback_inv;
_dma_cache_wback = r4k_dma_cache_wback_inv;
_dma_cache_inv = r4k_dma_cache_inv;
#endif
build_clear_page();
build_copy_page();
local_r4k___flush_cache_all(NULL);
coherency_setup();
}
