brcm63xx: add preliminary support for 3.13

[openwrt/svn-archive/archive.git] / target / linux / brcm63xx / patches-3.13 / 320-MIPS-BCM63XX-replace-irq-dispatch-code-with-a-generi.patch

diff --git a/target/linux/brcm63xx/patches-3.13/320-MIPS-BCM63XX-replace-irq-dispatch-code-with-a-generi.patch b/target/linux/brcm63xx/patches-3.13/320-MIPS-BCM63XX-replace-irq-dispatch-code-with-a-generi.patch
new file mode 100644 (file)
index 0000000..f0311ce
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.13/320-MIPS-BCM63XX-replace-irq-dispatch-code-with-a-generi.patch
@@ -0,0 +1,167 @@
+From 01bf26c51b427e24ac69f604d33f7d9360a9e470 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jogo@openwrt.org>
+Date: Thu, 18 Apr 2013 21:14:49 +0200
+Subject: [PATCH 31/53] MIPS: BCM63XX: replace irq dispatch code with a generic
+ version
+
+The generic version uses a variable length of u32 registers of u32/u64.
+This allows easier support for longer registers without having to rewrite
+verything.
+
+This "generic" version is not slower than the old version in the best case
+(= i == next set bit), and twice as fast in the worst case in 64 bits.
+
+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 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) {                                                     \
++              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);