[ar71xx] add experimental support for 2.6.30

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15561 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 56 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-2.6.30/902-mips_clocksource_init_war.patch b/target/linux/ar71xx/patches-2.6.30/902-mips_clocksource_init_war.patch
new file mode 100644
index 000000000..03a66ff13
--- /dev/null
+++ b/target/linux/ar71xx/patches-2.6.30/902-mips_clocksource_init_war.patch
@@ -0,0 +1,56 @@
+--- a/arch/mips/kernel/cevt-r4k.c
++++ b/arch/mips/kernel/cevt-r4k.c
+@@ -15,6 +15,22 @@
+ #include <asm/cevt-r4k.h>
+ 
+ /*
++ * Compare interrupt can be routed and latched outside the core,
++ * so a single execution hazard barrier may not be enough to give
++ * it time to clear as seen in the Cause register.  4 time the
++ * pipeline depth seems reasonably conservative, and empirically
++ * works better in configurations with high CPU/bus clock ratios.
++ */
++
++#define compare_change_hazard() \
++	do { \
++		irq_disable_hazard(); \
++		irq_disable_hazard(); \
++		irq_disable_hazard(); \
++		irq_disable_hazard(); \
++	} while (0)
++
++/*
+  * The SMTC Kernel for the 34K, 1004K, et. al. replaces several
+  * of these routines with SMTC-specific variants.
+  */
+@@ -30,6 +46,7 @@ static int mips_next_event(unsigned long
+ 	cnt = read_c0_count();
+ 	cnt += delta;
+ 	write_c0_compare(cnt);
++	compare_change_hazard();
+ 	res = ((int)(read_c0_count() - cnt) > 0) ? -ETIME : 0;
+ 	return res;
+ }
+@@ -99,22 +116,6 @@ static int c0_compare_int_pending(void)
+ 	return (read_c0_cause() >> cp0_compare_irq) & 0x100;
+ }
+ 
+-/*
+- * Compare interrupt can be routed and latched outside the core,
+- * so a single execution hazard barrier may not be enough to give
+- * it time to clear as seen in the Cause register.  4 time the
+- * pipeline depth seems reasonably conservative, and empirically
+- * works better in configurations with high CPU/bus clock ratios.
+- */
+-
+-#define compare_change_hazard() \
+-	do { \
+-		irq_disable_hazard(); \
+-		irq_disable_hazard(); \
+-		irq_disable_hazard(); \
+-		irq_disable_hazard(); \
+-	} while (0)
+-
+ int c0_compare_int_usable(void)
+ {
+ 	unsigned int delta;