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

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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>
This commit is contained in:
Geert Uytterhoeven
2008-03-27 11:38:31 +11:00
committed by Paul Mackerras
parent 5761eaa3a5
commit ca052f7924
4 changed files with 44 additions and 19 deletions
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30
drivers/ps3/ps3-sys-manager.c
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@@ -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);
}
/**