powerpc/47x: Base ppc476 support

This patch adds the base support for the 476 processor.  The code was
primarily written by Ben Herrenschmidt and Torez Smith, but I've been
maintaining it for a while.

The goal is to have a single binary that will run on 44x and 47x, but
we still have some details to work out.  The biggest is that the L1 cache
line size differs on the two platforms, but it's currently a compile-time
option.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Torez Smith  <lnxtorez@linux.vnet.ibm.com>
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index 8649f536f8df..8043d1b73cf0 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -441,7 +441,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
         addi    r3,r3,L1_CACHE_BYTES
         bdnz    0b
         sync
-#ifndef CONFIG_44x
+#ifdef CONFIG_44x
         /* We don't flush the icache on 44x. Those have a virtual icache
          * and we don't have access to the virtual address here (it's
          * not the page vaddr but where it's mapped in user space). The
@@ -449,15 +449,19 @@ END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
          * a change in the address space occurs, before returning to
          * user space
          */
+BEGIN_MMU_FTR_SECTION
+        blr
+END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_44x)
+#endif /* CONFIG_44x */
         mtctr   r4
 1:      icbi    0,r6
         addi    r6,r6,L1_CACHE_BYTES
         bdnz    1b
         sync
         isync
-#endif /* CONFIG_44x */
         blr
 
+#ifndef CONFIG_BOOKE
 /*
  * Flush a particular page from the data cache to RAM, identified
  * by its physical address.  We turn off the MMU so we can just use
@@ -490,6 +494,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
         mtmsr   r10                             /* restore DR */
         isync
         blr
+#endif /* CONFIG_BOOKE */
 
 /*
  * Clear pages using the dcbz instruction, which doesn't cause any