add the 2.6.30 port of the cache workaround patch from #4293 (thx, acoul)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16917 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/brcm47xx/patches-2.6.30/920-cache-wround.patch b/target/linux/brcm47xx/patches-2.6.30/920-cache-wround.patch
new file mode 100644 (file)
index 0000000..7bf4a24
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.30/920-cache-wround.patch
@@ -0,0 +1,135 @@
+--- a/arch/mips/include/asm/r4kcache.h         2008-12-03 14:06:48.000000000 +0100
++++ b/arch/mips/include/asm/r4kcache.h         2008-12-05 08:16:03.000000000 +0100
+@@ -20,10 +20,25 @@
+ #ifdef CONFIG_BCM47XX
+ #include <asm/paccess.h>
+ #include <linux/ssb/ssb.h>
+-#define BCM4710_DUMMY_RREG() ((void) *((u8 *) KSEG1ADDR(SSB_ENUM_BASE + SSB_IMSTATE)))
++#define BCM4710_DUMMY_RREG() bcm4710_dummy_rreg()
++
++static inline unsigned long bcm4710_dummy_rreg(void) {
++      return (*(volatile unsigned long *)(KSEG1ADDR(SSB_ENUM_BASE + SSB_IMSTATE)));
++}
++
++#define BCM4710_FILL_TLB(addr) bcm4710_fill_tlb((void*)(addr))
++
++static inline unsigned long bcm4710_fill_tlb(void *addr) {
++      return (*(unsigned long *)addr);
++}
++
++#define BCM4710_PROTECTED_FILL_TLB(addr) bcm4710_protected_fill_tlb((void*)(addr))
++
++static inline void bcm4710_protected_fill_tlb(void *addr) {
++      unsigned long x;
++      get_dbe(x, (unsigned long *)addr);;
++}
+ 
+-#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()
+ 
+--- a/arch/mips/mm/tlbex.c     2008-12-03 17:39:32.000000000 +0100
++++ b/arch/mips/mm/tlbex.c     2008-12-03 17:11:43.000000000 +0100
+@@ -547,6 +547,9 @@
+ #endif
+       uasm_i_addu(p, ptr, tmp, ptr);
+ #else
++#ifdef CONFIG_BCM47XX
++      uasm_i_nop(p);
++#endif
+       UASM_i_LA_mostly(p, ptr, pgdc);
+ #endif
+       uasm_i_mfc0(p, tmp, C0_BADVADDR); /* get faulting address */
+@@ -677,12 +680,12 @@
+               /* No need for uasm_i_nop */
+       }
+ 
+-#ifdef CONFIG_BCM47XX
+-      uasm_i_nop(&p);
+-#endif
+ #ifdef CONFIG_64BIT
+       build_get_pmde64(&p, &l, &r, K0, K1); /* get pmd in K1 */
+ #else
++# ifdef CONFIG_BCM47XX
++      uasm_i_nop(&p);
++# endif
+       build_get_pgde32(&p, K0, K1); /* get pgd in K1 */
+ #endif
+ 
+@@ -690,6 +693,9 @@
+       build_update_entries(&p, K0, K1);
+       build_tlb_write_entry(&p, &l, &r, tlb_random);
+       uasm_l_leave(&l, p);
++#ifdef CONFIG_BCM47XX
++      uasm_i_nop(&p);
++#endif
+       uasm_i_eret(&p); /* return from trap */
+ 
+ #ifdef CONFIG_64BIT
+@@ -1087,12 +1093,12 @@
+                                  struct uasm_reloc **r, unsigned int pte,
+                                  unsigned int ptr)
+ {
+-#ifdef CONFIG_BCM47XX
+-      uasm_i_nop(p);
+-#endif
+ #ifdef CONFIG_64BIT
+       build_get_pmde64(p, l, r, pte, ptr); /* get pmd in ptr */
+ #else
++# ifdef CONFIG_BCM47XX
++      uasm_i_nop(p);
++# endif
+       build_get_pgde32(p, pte, ptr); /* get pgd in ptr */
+ #endif
+ 
+@@ -1120,6 +1126,9 @@
+       build_update_entries(p, tmp, ptr);
+       build_tlb_write_entry(p, l, r, tlb_indexed);
+       uasm_l_leave(l, *p);
++#ifdef CONFIG_BCM47XX
++      uasm_i_nop(p);
++#endif
+       uasm_i_eret(p); /* return from trap */
+ 
+ #ifdef CONFIG_64BIT
+--- a/arch/mips/kernel/genex.S 2008-11-16 15:33:32.000000000 +0100
++++ b/arch/mips/kernel/genex.S 2008-12-05 07:14:52.000000000 +0100
+@@ -21,6 +21,19 @@
+ #include <asm/war.h>
+ #include <asm/page.h>
+ 
++#ifdef CONFIG_BCM47XX
++# ifdef eret
++#  undef eret
++# endif
++# define eret                                         \
++      .set push;                              \
++      .set noreorder;                         \
++       nop;                                   \
++       nop;                                   \
++       eret;                                  \
++      .set pop;
++#endif
++
+ #define PANIC_PIC(msg)                                        \
+               .set push;                              \
+               .set    reorder;                        \
+@@ -53,7 +66,6 @@
+       .set    noat
+ #ifdef CONFIG_BCM47XX
+       nop
+-      nop
+ #endif
+ #if R5432_CP0_INTERRUPT_WAR
+       mfc0    k0, CP0_INDEX
+@@ -78,6 +90,9 @@
+       .set    push
+       .set    mips3
+       .set    noat
++#ifdef CONFIG_BCM47XX
++      nop
++#endif
+       mfc0    k1, CP0_CAUSE
+       li      k0, 31<<2
+       andi    k1, k1, 0x7c