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authorGeert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>2008-03-27 11:38:31 +1100
committerPaul Mackerras <paulus@samba.org>2008-04-01 20:43:07 +1100
commitca052f7924141f34998ab440bb4d908dc021a46b (patch)
treef84280e5932f214794afcbbe95d866eabcf0a3a7 /drivers/ps3
parent5761eaa3a5ae3c7ea796add73b86176b7c963cca (diff)
[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>
Diffstat (limited to 'drivers/ps3')
-rw-r--r--drivers/ps3/ps3-sys-manager.c30
-rw-r--r--drivers/ps3/sys-manager-core.c16
2 files changed, 30 insertions, 16 deletions
diff --git a/drivers/ps3/ps3-sys-manager.c b/drivers/ps3/ps3-sys-manager.c
index d4f6f960dd18..1260b01a5361 100644
--- a/drivers/ps3/ps3-sys-manager.c
+++ b/drivers/ps3/ps3-sys-manager.c
@@ -24,6 +24,7 @@
#include <linux/reboot.h>
#include <asm/firmware.h>
+#include <asm/lv1call.h>
#include <asm/ps3.h>
#include "vuart.h"
@@ -581,6 +582,23 @@ fail_id:
return -EIO;
}
+static void ps3_sys_manager_fin(struct ps3_system_bus_device *dev)
+{
+ ps3_sys_manager_send_request_shutdown(dev);
+
+ pr_emerg("System Halted, OK to turn off power\n");
+
+ while (ps3_sys_manager_handle_msg(dev)) {
+ /* pause until next DEC interrupt */
+ lv1_pause(0);
+ }
+
+ while (1) {
+ /* pause, ignoring DEC interrupt */
+ lv1_pause(1);
+ }
+}
+
/**
* ps3_sys_manager_final_power_off - The final platform machine_power_off routine.
*
@@ -602,12 +620,8 @@ static void ps3_sys_manager_final_power_off(struct ps3_system_bus_device *dev)
ps3_sys_manager_send_next_op(dev, PS3_SM_NEXT_OP_SYS_SHUTDOWN,
PS3_SM_WAKE_DEFAULT);
- ps3_sys_manager_send_request_shutdown(dev);
-
- pr_emerg("System Halted, OK to turn off power\n");
- while (1)
- ps3_sys_manager_handle_msg(dev);
+ ps3_sys_manager_fin(dev);
}
/**
@@ -639,12 +653,8 @@ static void ps3_sys_manager_final_restart(struct ps3_system_bus_device *dev)
ps3_sys_manager_send_attr(dev, 0);
ps3_sys_manager_send_next_op(dev, PS3_SM_NEXT_OP_SYS_REBOOT,
PS3_SM_WAKE_DEFAULT);
- ps3_sys_manager_send_request_shutdown(dev);
-
- pr_emerg("System Halted, OK to turn off power\n");
- while (1)
- ps3_sys_manager_handle_msg(dev);
+ ps3_sys_manager_fin(dev);
}
/**
diff --git a/drivers/ps3/sys-manager-core.c b/drivers/ps3/sys-manager-core.c
index 31648f7d9ae1..474225852b63 100644
--- a/drivers/ps3/sys-manager-core.c
+++ b/drivers/ps3/sys-manager-core.c
@@ -19,6 +19,7 @@
*/
#include <linux/kernel.h>
+#include <asm/lv1call.h>
#include <asm/ps3.h>
/**
@@ -50,10 +51,7 @@ void ps3_sys_manager_power_off(void)
if (ps3_sys_manager_ops.power_off)
ps3_sys_manager_ops.power_off(ps3_sys_manager_ops.dev);
- printk(KERN_EMERG "System Halted, OK to turn off power\n");
- local_irq_disable();
- while (1)
- (void)0;
+ ps3_sys_manager_halt();
}
void ps3_sys_manager_restart(void)
@@ -61,8 +59,14 @@ void ps3_sys_manager_restart(void)
if (ps3_sys_manager_ops.restart)
ps3_sys_manager_ops.restart(ps3_sys_manager_ops.dev);
- printk(KERN_EMERG "System Halted, OK to turn off power\n");
+ ps3_sys_manager_halt();
+}
+
+void ps3_sys_manager_halt(void)
+{
+ pr_emerg("System Halted, OK to turn off power\n");
local_irq_disable();
while (1)
- (void)0;
+ lv1_pause(1);
}
+

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