pnp: Provide alternative pnp_enable() implementation

The current default implementation of pnp_enable() only disables devices
- if set so in the devicetree - but does not enable them. Enablement takes
place in pnp_enable_resources(). Yet, many PnP chips implement their own
version of pnp_enable() which also enables devices if set in the devicetree.

It's arguable, if enabling those devices makes sense, before they get
resources assigned. Maybe we can't write the resource registers if not,
who knows? The least we can do is providing a common implementation for
this behavior, and get rid of some code duplication.

Used the following cocci:
    @@
    expression e;
    @@
    +pnp_alt_enable(e);
    -pnp_set_logical_device(e);
    (
    -pnp_set_enable(e, !!e->enabled);
    |
    -(e->enabled) ? pnp_set_enable(e, 1) : pnp_set_enable(e, 0);
    |
    -if (e->enabled) { pnp_set_enable(e, 1); }
    -else { pnp_set_enable(e, 0); }
    )

Change-Id: I8d695e8fcd3cf8b847b1aa99326b51a554700bc4
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: http://review.coreboot.org/3480
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/include/device/pnp.h b/src/include/device/pnp.h
index f97b05dad0..566722335c 100644
--- a/src/include/device/pnp.h
+++ b/src/include/device/pnp.h
@@ -21,6 +21,7 @@ void pnp_read_resources(device_t dev);
 void pnp_set_resources(device_t dev);
 void pnp_enable_resources(device_t dev);
 void pnp_enable(device_t dev);
+void pnp_alt_enable(device_t dev);
 
 extern struct device_operations pnp_ops;