sparc64: Future proof Niagara cpu detection.

Recognize T4 and T5 chips.  Treating them both as "T2 plus other
stuff" should be extremely safe and make sure distributions will work
when those chips actually ship to customers.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 22 insertions, 3 deletions

diff --git a/arch/sparc/kernel/head_64.S b/arch/sparc/kernel/head_64.S
index 0eac1b2fc53d..0d810c2f1d00 100644
--- a/arch/sparc/kernel/head_64.S
+++ b/arch/sparc/kernel/head_64.S
@@ -133,7 +133,7 @@ prom_sun4v_name:
 prom_niagara_prefix:
         .asciz  "SUNW,UltraSPARC-T"
 prom_sparc_prefix:
-        .asciz  "SPARC-T"
+        .asciz  "SPARC-"
         .align  4
 prom_root_compatible:
         .skip   64
@@ -396,7 +396,7 @@ sun4v_chip_type:
         or      %g1, %lo(prom_cpu_compatible), %g1
         sethi   %hi(prom_sparc_prefix), %g7
         or      %g7, %lo(prom_sparc_prefix), %g7
-        mov     7, %g3
+        mov     6, %g3
 90:     ldub    [%g7], %g2
         ldub    [%g1], %g4
         cmp     %g2, %g4
@@ -408,10 +408,23 @@ sun4v_chip_type:
 
         sethi   %hi(prom_cpu_compatible), %g1
         or      %g1, %lo(prom_cpu_compatible), %g1
-        ldub    [%g1 + 7], %g2
+        ldub    [%g1 + 6], %g2
+        cmp     %g2, 'T'
+        be,pt   %xcc, 70f
+         cmp    %g2, 'M'
+        bne,pn  %xcc, 4f
+         nop
+
+70:     ldub    [%g1 + 7], %g2
         cmp     %g2, '3'
         be,pt   %xcc, 5f
          mov    SUN4V_CHIP_NIAGARA3, %g4
+        cmp     %g2, '4'
+        be,pt   %xcc, 5f
+         mov    SUN4V_CHIP_NIAGARA4, %g4
+        cmp     %g2, '5'
+        be,pt   %xcc, 5f
+         mov    SUN4V_CHIP_NIAGARA5, %g4
         ba,pt   %xcc, 4f
          nop
 
@@ -545,6 +558,12 @@ niagara_tlb_fixup:
         cmp     %g1, SUN4V_CHIP_NIAGARA3
         be,pt   %xcc, niagara2_patch
          nop
+        cmp     %g1, SUN4V_CHIP_NIAGARA4
+        be,pt   %xcc, niagara2_patch
+         nop
+        cmp     %g1, SUN4V_CHIP_NIAGARA5
+        be,pt   %xcc, niagara2_patch
+         nop
 
         call    generic_patch_copyops
          nop