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

[Kumar Gala]

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 at 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