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Diffstat (limited to 'target/linux/brcm63xx/patches-3.14/020-MIPS-BCM63XX-replace-irq-dispatch-code-with-a-generi.patch')
-rw-r--r--target/linux/brcm63xx/patches-3.14/020-MIPS-BCM63XX-replace-irq-dispatch-code-with-a-generi.patch174
1 files changed, 174 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-3.14/020-MIPS-BCM63XX-replace-irq-dispatch-code-with-a-generi.patch b/target/linux/brcm63xx/patches-3.14/020-MIPS-BCM63XX-replace-irq-dispatch-code-with-a-generi.patch
new file mode 100644
index 0000000000..021d0d9537
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.14/020-MIPS-BCM63XX-replace-irq-dispatch-code-with-a-generi.patch
@@ -0,0 +1,174 @@
+From 39b46ed1c9fe71890566e129d9ac5feb8421b3b4 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jogo@openwrt.org>
+Date: Thu, 18 Apr 2013 21:14:49 +0200
+Subject: [PATCH 03/10] MIPS: BCM63XX: replace irq dispatch code with a generic
+ version
+
+The generic version uses a variable length of u32 registers instead of u32/u64.
+This allows easier support for "wider" registers without having to rewrite
+everything.
+
+This "generic" version is as fast as the old version in the best case
+(i == next set bit), and twice as fast in the worst case in 64 bits.
+
+Using a macro was chosen over a (forced) inline version because gcc generated
+more compact code with the macro.
+
+The change from (signed) int to unsigned int for i and to_call was intentional
+as the value can be only between 0 and (width - 1) anyway, and allowed gcc to
+optimise the code a bit further.
+
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ arch/mips/bcm63xx/irq.c | 130 +++++++++++++++++++++---------------------------
+ 1 file changed, 56 insertions(+), 74 deletions(-)
+
+--- a/arch/mips/bcm63xx/irq.c
++++ b/arch/mips/bcm63xx/irq.c
+@@ -51,47 +51,65 @@ static inline void handle_internal(int i
+ * will resume the loop where it ended the last time we left this
+ * function.
+ */
+-static void __dispatch_internal_32(void)
+-{
+- u32 pending;
+- static int i;
+-
+- pending = bcm_readl(irq_stat_addr) & bcm_readl(irq_mask_addr);
+-
+- if (!pending)
+- return ;
+-
+- while (1) {
+- int to_call = i;
+
+- i = (i + 1) & 0x1f;
+- if (pending & (1 << to_call)) {
+- handle_internal(to_call);
+- break;
+- }
+- }
++#define BUILD_IPIC_INTERNAL(width) \
++void __dispatch_internal_##width(void) \
++{ \
++ u32 pending[width / 32]; \
++ unsigned int src, tgt; \
++ bool irqs_pending = false; \
++ static unsigned int i; \
++ \
++ /* read registers in reverse order */ \
++ for (src = 0, tgt = (width / 32); src < (width / 32); src++) { \
++ u32 val; \
++ \
++ val = bcm_readl(irq_stat_addr + src * sizeof(u32)); \
++ val &= bcm_readl(irq_mask_addr + src * sizeof(u32)); \
++ pending[--tgt] = val; \
++ \
++ if (val) \
++ irqs_pending = true; \
++ } \
++ \
++ if (!irqs_pending) \
++ return; \
++ \
++ while (1) { \
++ unsigned int to_call = i; \
++ \
++ i = (i + 1) & (width - 1); \
++ if (pending[to_call / 32] & (1 << (to_call & 0x1f))) { \
++ handle_internal(to_call); \
++ break; \
++ } \
++ } \
++} \
++ \
++static void __internal_irq_mask_##width(unsigned int irq) \
++{ \
++ u32 val; \
++ unsigned reg = (irq / 32) ^ (width/32 - 1); \
++ unsigned bit = irq & 0x1f; \
++ \
++ val = bcm_readl(irq_mask_addr + reg * sizeof(u32)); \
++ val &= ~(1 << bit); \
++ bcm_writel(val, irq_mask_addr + reg * sizeof(u32)); \
++} \
++ \
++static void __internal_irq_unmask_##width(unsigned int irq) \
++{ \
++ u32 val; \
++ unsigned reg = (irq / 32) ^ (width/32 - 1); \
++ unsigned bit = irq & 0x1f; \
++ \
++ val = bcm_readl(irq_mask_addr + reg * sizeof(u32)); \
++ val |= (1 << bit); \
++ bcm_writel(val, irq_mask_addr + reg * sizeof(u32)); \
+ }
+
+-static void __dispatch_internal_64(void)
+-{
+- u64 pending;
+- static int i;
+-
+- pending = bcm_readq(irq_stat_addr) & bcm_readq(irq_mask_addr);
+-
+- if (!pending)
+- return ;
+-
+- while (1) {
+- int to_call = i;
+-
+- i = (i + 1) & 0x3f;
+- if (pending & (1ull << to_call)) {
+- handle_internal(to_call);
+- break;
+- }
+- }
+-}
++BUILD_IPIC_INTERNAL(32);
++BUILD_IPIC_INTERNAL(64);
+
+ asmlinkage void plat_irq_dispatch(void)
+ {
+@@ -128,42 +146,6 @@ asmlinkage void plat_irq_dispatch(void)
+ * internal IRQs operations: only mask/unmask on PERF irq mask
+ * register.
+ */
+-static void __internal_irq_mask_32(unsigned int irq)
+-{
+- u32 mask;
+-
+- mask = bcm_readl(irq_mask_addr);
+- mask &= ~(1 << irq);
+- bcm_writel(mask, irq_mask_addr);
+-}
+-
+-static void __internal_irq_mask_64(unsigned int irq)
+-{
+- u64 mask;
+-
+- mask = bcm_readq(irq_mask_addr);
+- mask &= ~(1ull << irq);
+- bcm_writeq(mask, irq_mask_addr);
+-}
+-
+-static void __internal_irq_unmask_32(unsigned int irq)
+-{
+- u32 mask;
+-
+- mask = bcm_readl(irq_mask_addr);
+- mask |= (1 << irq);
+- bcm_writel(mask, irq_mask_addr);
+-}
+-
+-static void __internal_irq_unmask_64(unsigned int irq)
+-{
+- u64 mask;
+-
+- mask = bcm_readq(irq_mask_addr);
+- mask |= (1ull << irq);
+- bcm_writeq(mask, irq_mask_addr);
+-}
+-
+ static void bcm63xx_internal_irq_mask(struct irq_data *d)
+ {
+ internal_irq_mask(d->irq - IRQ_INTERNAL_BASE);