3 files changed, 55 insertions, 31 deletions

diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 8df2e254a3e..8f039a08b00 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -188,8 +188,8 @@ extern void __pgd_error(const char *file, int line, unsigned long val);
 #define L_PTE_MT_DEV_SHARED2    (0x05 << 2)     /* 0101 (v6) */
 #define L_PTE_MT_DEV_NONSHARED  (0x0c << 2)     /* 1100 */
 #define L_PTE_MT_DEV_IXP2000    (0x0d << 2)     /* 1101 */
-#define L_PTE_MT_DEV_WC         (0x09 << 2)     /* 1001 (pre-v6, !xsc3) */
-#define L_PTE_MT_DEV_WC2        (0x08 << 2)     /* 1000 (xsc3, v6) */
+#define L_PTE_MT_DEV_WC         (0x09 << 2)     /* 1001 (pre-v6) */
+#define L_PTE_MT_DEV_WC2        (0x08 << 2)     /* 1000 (v6) */
 #define L_PTE_MT_DEV_CACHED     (0x0b << 2)     /* 1011 */
 #define L_PTE_MT_MASK           (0x0f << 2)
 
diff --git a/arch/arm/mm/proc-xsc3.S b/arch/arm/mm/proc-xsc3.S
index ad1ce5a8922..96e47fc7fd6 100644
--- a/arch/arm/mm/proc-xsc3.S
+++ b/arch/arm/mm/proc-xsc3.S
@@ -347,16 +347,36 @@ ENTRY(cpu_xsc3_switch_mm)
  * Set a PTE and flush it out
  *
  */
+
+cpu_xsc3_mt_table:
+        .long   0x00                                            @ L_PTE_MT_UNCACHED
+        .long   PTE_BUFFERABLE                                  @ L_PTE_MT_BUFFERABLE
+        .long   PTE_EXT_TEX(5) | PTE_CACHEABLE                  @ L_PTE_MT_WRITETHROUGH
+        .long   PTE_EXT_TEX(5) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK
+        .long   0x00                                            @ L_PTE_MT_DEV_SHARED
+        .long   0x00                                            @ L_PTE_MT_DEV_SHARED2
+        .long   0x00                                            @ L_PTE_MT_MINICACHE (not present)
+        .long   PTE_EXT_TEX(5) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC (not present?)
+        .long   PTE_EXT_TEX(1)                                  @ L_PTE_MT_DEV_WC2
+        .long   PTE_EXT_TEX(1)                                  @ L_PTE_MT_DEV_WC
+        .long   0x00                                            @ unused
+        .long   PTE_EXT_TEX(5) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED
+        .long   0x00                                            @ L_PTE_MT_DEV_NONSHARED
+        .long   0x00                                            @ L_PTE_MT_DEV_IXP2000 (not present)
+        .long   0x00                                            @ unused
+        .long   0x00                                            @ unused
+
         .align  5
 ENTRY(cpu_xsc3_set_pte_ext)
         xscale_set_pte_ext_prologue
 
-        @ If it's cacheable, it needs to be in L2 also.
-        tst     r1, #L_PTE_CACHEABLE
-        orrne   r2, r2, #PTE_EXT_TEX(0x5)
-
         tst     r1, #L_PTE_SHARED               @ shared?
-        orrne   r2, r2, #0x200
+        and     r1, r1, #L_PTE_MT_MASK
+        adr     ip, cpu_xsc3_mt_table
+        ldr     ip, [ip, r1]
+        orrne   r2, r2, #PTE_EXT_COHERENT       @ interlock: mask in coherent bit
+        bic     r2, r2, #0x0c                   @ clear old C,B bits
+        orr     r2, r2, ip
 
         xscale_set_pte_ext_epilogue
         mov     pc, lr
diff --git a/arch/arm/mm/proc-xscale.S b/arch/arm/mm/proc-xscale.S
index 8d7512f9cba..6fa525364bb 100644
--- a/arch/arm/mm/proc-xscale.S
+++ b/arch/arm/mm/proc-xscale.S
@@ -406,8 +406,6 @@ ENTRY(cpu_xscale_dcache_clean_area)
 
 /* =============================== PageTable ============================== */
 
-#define PTE_CACHE_WRITE_ALLOCATE 0
-
 /*
  * cpu_xscale_switch_mm(pgd)
  *
@@ -431,34 +429,40 @@ ENTRY(cpu_xscale_switch_mm)
  *
  * Errata 40: must set memory to write-through for user read-only pages.
  */
+cpu_xscale_mt_table:
+        .long   0x00                                            @ L_PTE_MT_UNCACHED
+        .long   PTE_BUFFERABLE                                  @ L_PTE_MT_BUFFERABLE
+        .long   PTE_CACHEABLE                                   @ L_PTE_MT_WRITETHROUGH
+        .long   PTE_CACHEABLE | PTE_BUFFERABLE                  @ L_PTE_MT_WRITEBACK
+        .long   0x00                                            @ L_PTE_MT_DEV_SHARED
+        .long   0x00                                            @ L_PTE_MT_DEV_SHARED2
+        .long   PTE_EXT_TEX(1) | PTE_CACHEABLE                  @ L_PTE_MT_MINICACHE
+        .long   PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC
+        .long   PTE_BUFFERABLE                                  @ L_PTE_MT_DEV_WC2
+        .long   PTE_BUFFERABLE                                  @ L_PTE_MT_DEV_WC
+        .long   0x00                                            @ unused
+        .long   PTE_CACHEABLE | PTE_BUFFERABLE                  @ L_PTE_MT_DEV_CACHED
+        .long   0x00                                            @ L_PTE_MT_DEV_NONSHARED
+        .long   PTE_EXT_TEX(1) | PTE_BUFFERABLE                 @ L_PTE_MT_DEV_IXP2000
+        .long   0x00                                            @ unused
+        .long   0x00                                            @ unused
+
         .align  5
 ENTRY(cpu_xscale_set_pte_ext)
         xscale_set_pte_ext_prologue
-        @
-        @ Handle the X bit.  We want to set this bit for the minicache
-        @ (U = E = B = W = 0, C = 1) or when write allocate is enabled,
-        @ and we have a writeable, cacheable region.  If we ignore the
-        @ U and E bits, we can allow user space to use the minicache as
-        @ well.
-        @
-        @  X = (C & ~W & ~B) | (C & W & B & write_allocate)
-        @
-        and     ip, r1, #L_PTE_CACHEABLE | L_PTE_WRITE | L_PTE_BUFFERABLE
-        teq     ip, #L_PTE_CACHEABLE
-#if PTE_CACHE_WRITE_ALLOCATE
-        teqne   ip, #L_PTE_CACHEABLE | L_PTE_WRITE | L_PTE_BUFFERABLE
-#endif
-        orreq   r2, r2, #PTE_EXT_TEX(1)
 
         @
-        @ Erratum 40: The B bit must be cleared for a user read-only
-        @ cacheable page.
-        @
-        @  B = B & ~(U & C & ~W)
+        @ Erratum 40: must set memory to write-through for user read-only pages
         @
-        and     ip, r1, #L_PTE_USER | L_PTE_WRITE | L_PTE_CACHEABLE
-        teq     ip, #L_PTE_USER | L_PTE_CACHEABLE
-        biceq   r2, r2, #PTE_BUFFERABLE
+        and     ip, r1, #(L_PTE_MT_MASK | L_PTE_USER | L_PTE_WRITE) & ~(4 << 2)
+        teq     ip, #L_PTE_MT_WRITEBACK | L_PTE_USER
+
+        moveq   r1, #L_PTE_MT_WRITETHROUGH
+        and     r1, r1, #L_PTE_MT_MASK
+        adr     ip, cpu_xscale_mt_table
+        ldr     ip, [ip, r1]
+        bic     r2, r2, #0x0c
+        orr     r2, r2, ip
 
         xscale_set_pte_ext_epilogue
         mov     pc, lr