m68knommu: use user stack pointer hardware on some ColdFire cores

The more modern ColdFire parts (even if based on older version cores)
have separate user and supervisor stack pointers (a7 register).
Modify the ColdFire CPU setup and exception code to enable and use
this on parts that have it.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index 266a39eebcad..e6f482d18d05 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -75,6 +75,10 @@ config GENERIC_CLOCKEVENTS
 config NO_IOPORT
         def_bool y
 
+config COLDFIRE_SW_A7
+        bool
+        default n
+
 source "init/Kconfig"
 
 source "kernel/Kconfig.freezer"
@@ -107,11 +111,13 @@ config M68360
 
 config M5206
         bool "MCF5206"
+        select COLDFIRE_SW_A7
         help
           Motorola ColdFire 5206 processor support.
 
 config M5206e
         bool "MCF5206e"
+        select COLDFIRE_SW_A7
         help
           Motorola ColdFire 5206e processor support.
 
@@ -129,6 +135,7 @@ config M523x
 
 config M5249
         bool "MCF5249"
+        select COLDFIRE_SW_A7
         help
           Motorola ColdFire 5249 processor support.
 
@@ -139,6 +146,7 @@ config M5271
 
 config M5272
         bool "MCF5272"
+        select COLDFIRE_SW_A7
         help
           Motorola ColdFire 5272 processor support.
 
@@ -155,6 +163,7 @@ config M528x
 
 config M5307
         bool "MCF5307"
+        select COLDFIRE_SW_A7
         help
           Motorola ColdFire 5307 processor support.
 
@@ -165,6 +174,7 @@ config M532x
 
 config M5407
         bool "MCF5407"
+        select COLDFIRE_SW_A7
         help
           Motorola ColdFire 5407 processor support.