[POWERPC] PS3: Save power in busy loops on halt

PS3 save power on halt:
  - Replace infinite busy loops by smarter loops calling
    lv1_pause() to save power.
  - Add ps3_halt() and ps3_sys_manager_halt().
  - Add __noreturn annotations.

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 11 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/ps3/setup.c b/arch/powerpc/platforms/ps3/setup.c
index 5c2cbb08eb5..c144669a0d3 100644
--- a/arch/powerpc/platforms/ps3/setup.c
+++ b/arch/powerpc/platforms/ps3/setup.c
@@ -95,6 +95,14 @@ static void ps3_power_off(void)
         ps3_sys_manager_power_off(); /* never returns */
 }
 
+static void ps3_halt(void)
+{
+        DBG("%s:%d\n", __func__, __LINE__);
+
+        smp_send_stop();
+        ps3_sys_manager_halt(); /* never returns */
+}
+
 static void ps3_panic(char *str)
 {
         DBG("%s:%d %s\n", __func__, __LINE__, str);
@@ -105,7 +113,8 @@ static void ps3_panic(char *str)
         printk("   Please press POWER button.\n");
         printk("\n");
 
-        while(1);
+        while(1)
+                lv1_pause(1);
 }
 
 #if defined(CONFIG_FB_PS3) || defined(CONFIG_FB_PS3_MODULE) || \
@@ -266,6 +275,7 @@ define_machine(ps3) {
         .progress                       = ps3_progress,
         .restart                        = ps3_restart,
         .power_off                      = ps3_power_off,
+        .halt                           = ps3_halt,
 #if defined(CONFIG_KEXEC)
         .kexec_cpu_down                 = ps3_kexec_cpu_down,
         .machine_kexec                  = default_machine_kexec,