[PATCH] powerpc: IBMEBUS bus support

This patch adds the necessary core bus support used by device drivers
that sit on the IBM GX bus on modern pSeries machines like the Galaxy
infiniband for example. It provide transparent DMA ops (the low level
driver works with virtual addresses directly) along with a simple bus
layer using the Open Firmware matching routines.

Signed-off-by: Heiko J Schick <schickhj@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/Kconfig

@@ -384,6 +384,13 @@ config IBMVIO
 	bool
 	default y
 
+config IBMEBUS
+	depends on PPC_PSERIES
+	bool "Support for GX bus based adapters"
+	default y
+	help
+	  Bus device driver for GX bus based adapters.
+
 config PPC_MPC106
 	bool
 	default n

arch/powerpc/kernel/Makefile

@@ -30,6 +30,7 @@ obj-$(CONFIG_RTAS_FLASH)	+= rtas_flash.o
 obj-$(CONFIG_RTAS_PROC)		+= rtas-proc.o
 obj-$(CONFIG_LPARCFG)		+= lparcfg.o
 obj-$(CONFIG_IBMVIO)		+= vio.o
+obj-$(CONFIG_IBMEBUS)           += ibmebus.o
 obj-$(CONFIG_GENERIC_TBSYNC)	+= smp-tbsync.o
 obj-$(CONFIG_PPC_PSERIES)	+= udbg_16550.o
 obj-$(CONFIG_PPC_MAPLE)		+= udbg_16550.o

arch/powerpc/kernel/dma_64.c

@@ -10,6 +10,7 @@
 /* Include the busses we support */
 #include <linux/pci.h>
 #include <asm/vio.h>
+#include <asm/ibmebus.h>
 #include <asm/scatterlist.h>
 #include <asm/bug.h>
 
@@ -22,6 +23,10 @@ static struct dma_mapping_ops *get_dma_ops(struct device *dev)
 #ifdef CONFIG_IBMVIO
 	if (dev->bus == &vio_bus_type)
 		return &vio_dma_ops;
+#endif
+#ifdef CONFIG_IBMEBUS
+	if (dev->bus == &ibmebus_bus_type)
+		return &ibmebus_dma_ops;
 #endif
 	return NULL;
 }
@@ -47,6 +52,10 @@ int dma_set_mask(struct device *dev, u64 dma_mask)
 	if (dev->bus == &vio_bus_type)
 		return -EIO;
 #endif /* CONFIG_IBMVIO */
+#ifdef CONFIG_IBMEBUS
+	if (dev->bus == &ibmebus_bus_type)
+		return -EIO;
+#endif
 	BUG();
 	return 0;
 }