Re: [RFC] powerpc/mpc85xx: add support for suspend mode

On Jun 3, 2009, at 2:54 PM, Sebastian Andrzej Siewior wrote:

This patch adds support for the MPC85xx boards to enter the SLEEP  
mode.
The wake up is done via an external interrupt.
mpc85xx_enter_sleep() does not clear HID0_SLEEP in resume but it may  
be
okay since it gets cleared on next NAP/DOZE.
mpc85xx_enter_sleep() is mostly copied from NAP/DOZE. It does not look
like it is worth to merge into e500_idle(). I removed the feature  
check
for NAP/DOZE because it does not look required. It is just there to  
work
around the BDI. If it is required it could be moved to
mpc85xx_init_suspend().
The suspend.c file contains a sample implementation. I need  
additionally
to add hooks prio and after mpc85xx_enter_sleep() to toggle a few bits
in my FPGA. Since the suspend.c is really short I'm not sure if it is
worth to keep it here and add couple function prototypes or add the
required bits directly into the board code.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
arch/powerpc/Kconfig                  |    2 +-
arch/powerpc/kernel/idle_e500.S       |   43 ++++++++++++++++++++++++ 
+++++++++
arch/powerpc/platforms/85xx/Makefile  |    1 +
arch/powerpc/platforms/85xx/suspend.c |   27 ++++++++++++++++++++
4 files changed, 72 insertions(+), 1 deletions(-)
create mode 100644 arch/powerpc/platforms/85xx/suspend.c

On what system did you test / develop this on?

- k