[PATCH] parport: add parallel port support for SGI O2

Add support for the built-in parallel port on SGI O2 (a.k.a.  IP32).
Define a new configuration option: PARPORT_IP32.  The module is named
parport_ip32.

Hardware support for SPP, EPP and ECP modes along with DMA support when
available are currently implemented.
Signed-off-by: NArnaud Giersch <arnaud.giersch@free.fr>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/parport/Kconfig

@@ -90,6 +90,15 @@ config PARPORT_ARC
 	depends on ARM && PARPORT
 	select PARPORT_NOT_PC
 
+config PARPORT_IP32
+	tristate "SGI IP32 builtin port (EXPERIMENTAL)"
+	depends on SGI_IP32 && PARPORT && EXPERIMENTAL
+	select PARPORT_NOT_PC
+	help
+	  Say Y here if you need support for the parallel port on
+	  SGI O2 machines. This code is also available as a module (say M),
+	  called parport_ip32.  If in doubt, saying N is the safe plan.
+
 config PARPORT_AMIGA
 	tristate "Amiga builtin port"
 	depends on AMIGA && PARPORT

drivers/parport/Makefile

@@ -17,3 +17,4 @@ obj-$(CONFIG_PARPORT_MFC3)	+= parport_mfc3.o
 obj-$(CONFIG_PARPORT_ATARI)	+= parport_atari.o
 obj-$(CONFIG_PARPORT_SUNBPP)	+= parport_sunbpp.o
 obj-$(CONFIG_PARPORT_GSC)	+= parport_gsc.o
+obj-$(CONFIG_PARPORT_IP32)	+= parport_ip32.o

include/linux/parport.h

@@ -128,6 +128,11 @@ struct amiga_parport_state {
        unsigned char statusdir;/* ciab.ddrb & 7 */
 };
 
+struct ip32_parport_state {
+	unsigned int dcr;
+	unsigned int ecr;
+};
+
 struct parport_state {
 	union {
 		struct pc_parport_state pc;
@@ -135,6 +140,7 @@ struct parport_state {
 		struct ax_parport_state ax;
 		struct amiga_parport_state amiga;
 		/* Atari has not state. */
+		struct ip32_parport_state ip32;
 		void *misc; 
 	} u;
 };