3 files changed, 10 insertions, 6 deletions

diff --git a/arch/sparc/include/asm/auxio_32.h b/arch/sparc/include/asm/auxio_32.h
index 3a319775ae37..b81666043c0b 100644
--- a/arch/sparc/include/asm/auxio_32.h
+++ b/arch/sparc/include/asm/auxio_32.h
@@ -78,7 +78,7 @@ do { \
 
 
 /* AUXIO2 (Power Off Control) */
-extern __volatile__ unsigned char * auxio_power_register;
+extern volatile u8 __iomem *auxio_power_register;
 
 #define AUXIO_POWER_DETECT_FAILURE      32
 #define AUXIO_POWER_CLEAR_FAILURE       2
diff --git a/arch/sparc/kernel/auxio_32.c b/arch/sparc/kernel/auxio_32.c
index c6fc1d451407..ae88c223e4d3 100644
--- a/arch/sparc/kernel/auxio_32.c
+++ b/arch/sparc/kernel/auxio_32.c
@@ -106,7 +106,7 @@ EXPORT_SYMBOL(set_auxio);
 
 /* sun4m power control register (AUXIO2) */
 
-volatile unsigned char * auxio_power_register = NULL;
+volatile u8 __iomem *auxio_power_register = NULL;
 
 void __init auxio_power_probe(void)
 {
@@ -130,8 +130,8 @@ void __init auxio_power_probe(void)
         r.flags = regs.which_io & 0xF;
         r.start = regs.phys_addr;
         r.end = regs.phys_addr + regs.reg_size - 1;
-        auxio_power_register = (unsigned char *) of_ioremap(&r, 0,
-            regs.reg_size, "auxpower");
+        auxio_power_register =
+                (u8 __iomem *)of_ioremap(&r, 0, regs.reg_size, "auxpower");
 
         /* Display a quick message on the console. */
         if (auxio_power_register)
diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
index 61f810b0a9d9..50e7b626afe8 100644
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -106,8 +106,12 @@ void machine_restart(char * cmd)
 void machine_power_off(void)
 {
         if (auxio_power_register &&
-            (strcmp(of_console_device->type, "serial") || scons_pwroff))
-                *auxio_power_register |= AUXIO_POWER_OFF;
+            (strcmp(of_console_device->type, "serial") || scons_pwroff)) {
+                u8 power_register = sbus_readb(auxio_power_register);
+                power_register |= AUXIO_POWER_OFF;
+                sbus_writeb(power_register, auxio_power_register);
+        }
+
         machine_halt();
 }