From c6fd9710b60769922aa12d8192939147852320b1 Mon Sep 17 00:00:00 2001 From: juhosg Date: Tue, 26 Jan 2010 09:57:38 +0000 Subject: ramips: add preliminary support for 2.6.32 git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19343 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- .../002-mips-clocksource-init-war.patch | 56 ++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 target/linux/ramips/patches-2.6.32/002-mips-clocksource-init-war.patch (limited to 'target/linux/ramips/patches-2.6.32/002-mips-clocksource-init-war.patch') diff --git a/target/linux/ramips/patches-2.6.32/002-mips-clocksource-init-war.patch b/target/linux/ramips/patches-2.6.32/002-mips-clocksource-init-war.patch new file mode 100644 index 000000000..894eed1e5 --- /dev/null +++ b/target/linux/ramips/patches-2.6.32/002-mips-clocksource-init-war.patch @@ -0,0 +1,56 @@ +--- a/arch/mips/kernel/cevt-r4k.c ++++ b/arch/mips/kernel/cevt-r4k.c +@@ -16,6 +16,22 @@ + #include + + /* ++ * 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. + */ +@@ -31,6 +47,7 @@ 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; + } +@@ -100,22 +117,6 @@ 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; -- cgit v1.2.3