add BCM4710A0 cache workarounds (#143)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2717 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 316 insertions, 0 deletions

diff --git a/target/linux/linux-2.6/patches/brcm/003-bcm4710_cache_fixes.patch b/target/linux/linux-2.6/patches/brcm/003-bcm4710_cache_fixes.patch
new file mode 100644
index 000000000..76e90584d
--- /dev/null
+++ b/target/linux/linux-2.6/patches/brcm/003-bcm4710_cache_fixes.patch
@@ -0,0 +1,316 @@
+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