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openwrt-xburst/target/linux/linux-2.6/patches/brcm/003-bcm4710_cache_fixes.patch

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add BCM4710A0 cache workarounds (#143) git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2717 3c298f89-4303-0410-b956-a3cf2f4a3e73
2005-12-18 07:17:25 +02:00
diff -urN linux.old/arch/mips/kernel/genex.S linux.dev/arch/mips/kernel/genex.S
--- linux.old/arch/mips/kernel/genex.S 2005-12-04 06:10:42.000000000 +0100
+++ linux.dev/arch/mips/kernel/genex.S 2005-12-18 05:30:48.564937750 +0100
@@ -72,6 +72,10 @@
.set push
.set mips3
.set noat
+#ifdef CONFIG_BCM4710
+ nop
+ nop
+#endif
mfc0 k1, CP0_CAUSE
li k0, 31<<2
andi k1, k1, 0x7c
diff -urN linux.old/arch/mips/mm/c-r4k.c linux.dev/arch/mips/mm/c-r4k.c
--- linux.old/arch/mips/mm/c-r4k.c 2005-12-04 06:10:42.000000000 +0100
+++ linux.dev/arch/mips/mm/c-r4k.c 2005-12-18 06:08:19.112437750 +0100
@@ -14,6 +14,12 @@
#include <linux/mm.h>
#include <linux/bitops.h>
+#ifdef CONFIG_BCM4710
+#include "../bcm947xx/include/typedefs.h"
+#include "../bcm947xx/include/sbconfig.h"
+#include <asm/paccess.h>
+#endif
+
#include <asm/bcache.h>
#include <asm/bootinfo.h>
#include <asm/cache.h>
@@ -29,6 +35,9 @@
#include <asm/war.h>
#include <asm/cacheflush.h> /* for run_uncached() */
+/* For enabling BCM4710 cache workarounds */
+int bcm4710 = 0;
+
/*
* Must die.
*/
@@ -73,7 +82,9 @@
{
unsigned long dc_lsize = cpu_dcache_line_size();
- if (dc_lsize == 16)
+ if (bcm4710)
+ r4k_blast_dcache_page = blast_dcache_page;
+ else 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;
@@ -85,7 +96,9 @@
{
unsigned long dc_lsize = cpu_dcache_line_size();
- if (dc_lsize == 16)
+ if (bcm4710)
+ r4k_blast_dcache_page_indexed = blast_dcache_page_indexed;
+ else 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;
@@ -97,7 +110,9 @@
{
unsigned long dc_lsize = cpu_dcache_line_size();
- if (dc_lsize == 16)
+ if (bcm4710)
+ r4k_blast_dcache = blast_dcache;
+ else if (dc_lsize == 16)
r4k_blast_dcache = blast_dcache16;
else if (dc_lsize == 32)
r4k_blast_dcache = blast_dcache32;
@@ -486,6 +501,9 @@
addr = start & ~(dc_lsize - 1);
aend = (end - 1) & ~(dc_lsize - 1);
+ BCM4710_PROTECTED_FILL_TLB(addr);
+ BCM4710_PROTECTED_FILL_TLB(aend);
+
while (1) {
/* Hit_Writeback_Inv_D */
protected_writeback_dcache_line(addr);
@@ -657,6 +675,10 @@
R4600_HIT_CACHEOP_WAR_IMPL;
a = addr & ~(dc_lsize - 1);
end = (addr + size - 1) & ~(dc_lsize - 1);
+
+ BCM4710_FILL_TLB(a);
+ BCM4710_FILL_TLB(end);
+
while (1) {
flush_dcache_line(a); /* Hit_Writeback_Inv_D */
if (a == end)
@@ -702,6 +724,10 @@
R4600_HIT_CACHEOP_WAR_IMPL;
a = addr & ~(dc_lsize - 1);
end = (addr + size - 1) & ~(dc_lsize - 1);
+
+ BCM4710_FILL_TLB(a);
+ BCM4710_FILL_TLB(end);
+
while (1) {
flush_dcache_line(a); /* Hit_Writeback_Inv_D */
if (a == end)
@@ -727,6 +753,8 @@
unsigned long addr = (unsigned long) arg;
R4600_HIT_CACHEOP_WAR_IMPL;
+ BCM4710_PROTECTED_FILL_TLB(addr);
+ BCM4710_PROTECTED_FILL_TLB(addr + 4);
protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
if (!cpu_icache_snoops_remote_store)
protected_writeback_scache_line(addr & ~(sc_lsize - 1));
@@ -1202,6 +1230,16 @@
static inline void coherency_setup(void)
{
change_c0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
+#if defined(CONFIG_BCM4310) || defined(CONFIG_BCM4704) || defined(CONFIG_BCM5365)
+ if (BCM330X(current_cpu_data.processor_id)) {
+ __u32 cm = read_c0_diag();
+ /* Enable icache */
+ cm |= (1 << 31);
+ /* Enable dcache */
+ cm |= (1 << 30);
+ write_c0_diag(cm);
+ }
+#endif
/*
* c0_status.cu=0 specifies that updates by the sc instruction use
@@ -1231,6 +1269,15 @@
/* Default cache error handler for R4000 and R5000 family */
set_uncached_handler (0x100, &except_vec2_generic, 0x80);
+
+ /* Check if special workarounds are required */
+#ifdef CONFIG_BCM4710
+ if (current_cpu_data.cputype == CPU_BCM4710 && (current_cpu_data.processor_id & 0xff) == 0) {
+ printk("Enabling BCM4710A0 cache workarounds.\n");
+ bcm4710 = 1;
+ } else
+#endif
+ bcm4710 = 0;
probe_pcache();
setup_scache();
diff -urN linux.old/arch/mips/mm/tlbex.c linux.dev/arch/mips/mm/tlbex.c
--- linux.old/arch/mips/mm/tlbex.c 2005-12-15 12:57:27.945158000 +0100
+++ linux.dev/arch/mips/mm/tlbex.c 2005-12-18 06:06:17.916863500 +0100
@@ -28,6 +28,10 @@
/* #define DEBUG_TLB */
+#ifdef CONFIG_BCM4710
+extern int bcm4710;
+#endif
+
static __init int __attribute__((unused)) r45k_bvahwbug(void)
{
/* XXX: We should probe for the presence of this bug, but we don't. */
@@ -1152,6 +1156,12 @@
memset(relocs, 0, sizeof(relocs));
memset(final_handler, 0, sizeof(final_handler));
+#ifdef CONFIG_BCM4710
+ if (bcm4710) {
+ i_nop(&p);
+ }
+#endif
+
/*
* create the plain linear handler
*/
diff -urN linux.old/include/asm-mips/r4kcache.h linux.dev/include/asm-mips/r4kcache.h
--- linux.old/include/asm-mips/r4kcache.h 2005-12-17 22:39:19.281320000 +0100
+++ linux.dev/include/asm-mips/r4kcache.h 2005-12-18 05:22:06.020280750 +0100
@@ -15,6 +15,18 @@
#include <asm/asm.h>
#include <asm/cacheops.h>
+#ifdef CONFIG_BCM4710
+#define BCM4710_DUMMY_RREG() (((sbconfig_t *)(KSEG1ADDR(SB_ENUM_BASE + SBCONFIGOFF)))->sbimstate)
+
+#define BCM4710_FILL_TLB(addr) (*(volatile unsigned long *)(addr))
+#define BCM4710_PROTECTED_FILL_TLB(addr) ({ unsigned long x; get_dbe(x, (volatile unsigned long *)(addr)); })
+#else
+#define BCM4710_DUMMY_RREG()
+
+#define BCM4710_FILL_TLB(addr)
+#define BCM4710_PROTECTED_FILL_TLB(addr)
+#endif
+
/*
* This macro return a properly sign-extended address suitable as base address
* for indexed cache operations. Two issues here:
@@ -45,6 +57,7 @@
static inline void flush_dcache_line_indexed(unsigned long addr)
{
+ BCM4710_DUMMY_RREG();
cache_op(Index_Writeback_Inv_D, addr);
}
@@ -60,11 +73,13 @@
static inline void flush_dcache_line(unsigned long addr)
{
+ BCM4710_DUMMY_RREG();
cache_op(Hit_Writeback_Inv_D, addr);
}
static inline void invalidate_dcache_line(unsigned long addr)
{
+ BCM4710_DUMMY_RREG();
cache_op(Hit_Invalidate_D, addr);
}
@@ -104,6 +119,7 @@
*/
static inline void protected_writeback_dcache_line(unsigned long addr)
{
+ BCM4710_DUMMY_RREG();
__asm__ __volatile__(
" .set push \n"
" .set noreorder \n"
@@ -166,6 +182,49 @@
: "r" (base), \
"i" (op));
+static inline void blast_dcache(void)
+{
+ unsigned long start = KSEG0;
+ unsigned long dcache_size = current_cpu_data.dcache.waysize * current_cpu_data.dcache.ways;
+ unsigned long end = (start + dcache_size);
+
+ do {
+ BCM4710_DUMMY_RREG();
+ cache_op(Index_Writeback_Inv_D, start);
+ start += current_cpu_data.dcache.linesz;
+ } while(start < end);
+}
+
+static inline void blast_dcache_page(unsigned long page)
+{
+ unsigned long start = page;
+ unsigned long end = start + PAGE_SIZE;
+
+ BCM4710_FILL_TLB(start);
+ do {
+ BCM4710_DUMMY_RREG();
+ cache_op(Hit_Writeback_Inv_D, start);
+ start += current_cpu_data.dcache.linesz;
+ } while(start < end);
+}
+
+static inline void blast_dcache_page_indexed(unsigned long page)
+{
+ unsigned long start = page;
+ unsigned long end = start + PAGE_SIZE;
+ unsigned long ws_inc = 1UL << current_cpu_data.dcache.waybit;
+ unsigned long ws_end = current_cpu_data.dcache.ways <<
+ current_cpu_data.dcache.waybit;
+ unsigned long ws, addr;
+ for (ws = 0; ws < ws_end; ws += ws_inc) {
+ start = page + ws;
+ for (addr = start; addr < end; addr += current_cpu_data.dcache.linesz) {
+ BCM4710_DUMMY_RREG();
+ cache_op(Index_Writeback_Inv_D, addr);
+ }
+ }
+}
+
static inline void blast_dcache16(void)
{
unsigned long start = INDEX_BASE;
@@ -213,7 +272,8 @@
unsigned long ws_end = current_cpu_data.icache.ways <<
current_cpu_data.icache.waybit;
unsigned long ws, addr;
-
+
+ BCM4710_FILL_TLB(start);
for (ws = 0; ws < ws_end; ws += ws_inc)
for (addr = start; addr < end; addr += 0x200)
cache16_unroll32(addr|ws,Index_Invalidate_I);
@@ -357,6 +417,7 @@
current_cpu_data.icache.waybit;
unsigned long ws, addr;
+ BCM4710_FILL_TLB(start);
for (ws = 0; ws < ws_end; ws += ws_inc)
for (addr = start; addr < end; addr += 0x400)
cache32_unroll32(addr|ws,Index_Invalidate_I);
@@ -471,6 +532,7 @@
unsigned long start = page;
unsigned long end = start + PAGE_SIZE;
+ BCM4710_FILL_TLB(start);
do {
cache64_unroll32(start,Hit_Invalidate_I);
start += 0x800;
diff -urN linux.old/include/asm-mips/stackframe.h linux.dev/include/asm-mips/stackframe.h
--- linux.old/include/asm-mips/stackframe.h 2005-12-04 06:10:42.000000000 +0100
+++ linux.dev/include/asm-mips/stackframe.h 2005-12-18 05:33:02.405302250 +0100
@@ -285,6 +285,10 @@
.macro RESTORE_SP_AND_RET
LONG_L sp, PT_R29(sp)
.set mips3
+#ifdef CONFIG_BCM4710
+ nop
+ nop
+#endif
eret
.set mips0
.endm
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