[PATCH] ioc4: CONFIG split

The SGI IOC4 I/O controller chip drivers are currently all configured by
CONFIG_BLK_DEV_SGIIOC4. This is undesirable as not all IOC4 hardware features
are needed by all systems.

This patch adds two configuration variables, CONFIG_SGI_IOC4 for core IOC4
driver support (see patch 1/3 in this series for further explanation) and
CONFIG_SERIAL_SGI_IOC4 to independently enable serial port support.

Signed-off-by: Brent Casavant <[e-mail]>
Acked-by: Pat Gefre <[e-mail]>
Acked-by: Jeremy Higdon <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/ia64/configs/sn2_defconfig

···
 CONFIG_SERIAL_CORE=y
 CONFIG_SERIAL_CORE_CONSOLE=y
 CONFIG_SERIAL_SGI_L1_CONSOLE=y
+CONFIG_SERIAL_SGI_IOC4=y
 CONFIG_UNIX98_PTYS=y
 CONFIG_LEGACY_PTYS=y
 CONFIG_LEGACY_PTY_COUNT=256
···
 # CONFIG_INFINIBAND_MTHCA_DEBUG is not set
 CONFIG_INFINIBAND_IPOIB=m
 # CONFIG_INFINIBAND_IPOIB_DEBUG is not set
+
+#
+# SN Devices
+#
+CONFIG_SGI_IOC4=y
 
 #
 # File systems

arch/ia64/defconfig

···
 CONFIG_SERIAL_CORE=y
 CONFIG_SERIAL_CORE_CONSOLE=y
 CONFIG_SERIAL_SGI_L1_CONSOLE=y
+CONFIG_SERIAL_SGI_IOC4=y
 CONFIG_UNIX98_PTYS=y
 CONFIG_LEGACY_PTYS=y
 CONFIG_LEGACY_PTY_COUNT=256
···
 # CONFIG_INFINIBAND_MTHCA_DEBUG is not set
 CONFIG_INFINIBAND_IPOIB=m
 # CONFIG_INFINIBAND_IPOIB_DEBUG is not set
+
+#
+# SN Devices
+#
+CONFIG_SGI_IOC4=y
 
 #
 # File systems

drivers/Kconfig

···
 
 source "drivers/infiniband/Kconfig"
 
+source "drivers/sn/Kconfig"
+
 endmenu

drivers/Makefile

···
 obj-$(CONFIG_CPU_FREQ)		+= cpufreq/
 obj-$(CONFIG_MMC)		+= mmc/
 obj-$(CONFIG_INFINIBAND)	+= infiniband/
-obj-$(CONFIG_BLK_DEV_SGIIOC4)	+= sn/
+obj-$(CONFIG_SGI_IOC4)		+= sn/
 obj-y				+= firmware/
 obj-$(CONFIG_CRYPTO)		+= crypto/

drivers/ide/Kconfig

···
 	  chipsets.
 
 config BLK_DEV_SGIIOC4
-	tristate "Silicon Graphics IOC4 chipset support"
-	depends on IA64_SGI_SN2 || IA64_GENERIC
+	tristate "Silicon Graphics IOC4 chipset ATA/ATAPI support"
+	depends on (IA64_SGI_SN2 || IA64_GENERIC) && SGI_IOC4
 	help
 	  This driver adds PIO & MultiMode DMA-2 support for the SGI IOC4
 	  chipset, which has one channel and can support two devices.

drivers/serial/Kconfig

···
           To compile this driver as a module, choose M here: the
           module will be called jsm.
 
+config SERIAL_SGI_IOC4
+	tristate "SGI IOC4 controller serial support"
+	depends on (IA64_GENERIC || IA64_SGI_SN2) && SGI_IOC4
+	select SERIAL_CORE
+	help
+		If you have an SGI Altix with an IOC4 based Base IO card
+		and wish to use the serial ports on this card, say Y.
+		Otherwise, say N.
+
 endmenu

drivers/serial/Makefile

···
 obj-$(CONFIG_SERIAL_JSM) += jsm/
 obj-$(CONFIG_SERIAL_TXX9) += serial_txx9.o
 obj-$(CONFIG_SERIAL_VR41XX) += vr41xx_siu.o
-obj-$(CONFIG_BLK_DEV_SGIIOC4) += ioc4_serial.o
+obj-$(CONFIG_SERIAL_SGI_IOC4) += ioc4_serial.o

drivers/sn/Kconfig

···
+#
+# Miscellaneous SN-specific devices
+#
+
+menu "SN Devices"
+
+config SGI_IOC4
+	tristate "SGI IOC4 Base IO support"
+	depends on IA64_GENERIC || IA64_SGI_SN2
+	default m
+	---help---
+	This option enables basic support for the SGI IOC4-based Base IO
+	controller card.  This option does not enable any specific
+	functions on such a card, but provides necessary infrastructure
+	for other drivers to utilize.
+
+	If you have an SGI Altix with an IOC4-based
+	I/O controller say Y.  Otherwise say N.
+
+endmenu

drivers/sn/Makefile

···
 #
 #
 
-obj-$(CONFIG_BLK_DEV_SGIIOC4) += ioc4.o
+obj-$(CONFIG_SGI_IOC4) += ioc4.o