[ARM] Convert Xscale and Xscale3 to use new memory types

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 28 insertions, 24 deletions

diff --git a/arch/arm/mm/proc-xscale.S b/arch/arm/mm/proc-xscale.S
index 8d7512f9cba7..6fa525364bb7 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