[PATCH] ioc4: Enable build on non-SN2

The SGI PCI-RT card, based on the SGI IOC4 chip, will be made available on
Altix XE (x86_64) platforms in the near future.  As such it is now a
misnomer for the IOC4 base device driver to live under drivers/sn, and
would complicate builds for non-SN2.

This patch moves the IOC4 base driver code from drivers/sn to drivers/misc,
and updates the associated Makefiles and Kconfig files to allow building on
non-SN2 configs.  Due to the resulting change in link order, it is now
necessary to use late_initcall() for IOC4 subdriver initialization.

[akpm@osdl.org: __udivdi3 fix]
[akpm@osdl.org: fix default in Kconfig]
Acked-by: Pat Gefre <pfg@sgi.com>
Acked-by: Jeremy Higdon <jeremy@sgi.com>
Signed-off-by: Brent Casavant <bcasavan@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/Kconfig

@@ -14,6 +14,10 @@ source "drivers/pnp/Kconfig"
 
 source "drivers/block/Kconfig"
 
+# misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
+
+source "drivers/misc/Kconfig"
+
 source "drivers/ide/Kconfig"
 
 source "drivers/scsi/Kconfig"
@@ -52,8 +56,6 @@ source "drivers/w1/Kconfig"
 
 source "drivers/hwmon/Kconfig"
 
-source "drivers/misc/Kconfig"
-
 source "drivers/mfd/Kconfig"
 
 source "drivers/media/Kconfig"

drivers/ide/pci/sgiioc4.c

@@ -774,7 +774,7 @@ ioc4_ide_exit(void)
 	ioc4_unregister_submodule(&ioc4_ide_submodule);
 }
 
-module_init(ioc4_ide_init);
+late_initcall(ioc4_ide_init); /* Call only after IDE init is done */
 module_exit(ioc4_ide_exit);
 
 MODULE_AUTHOR("Aniket Malatpure/Jeremy Higdon");

drivers/misc/Kconfig

@@ -28,6 +28,17 @@ config IBM_ASM
 
 	  If unsure, say N.
 
+config SGI_IOC4
+	tristate "SGI IOC4 Base IO support"
+	---help---
+	  This option enables basic support for the IOC4 chip on certain
+	  SGI IO controller cards (IO9, IO10, and PCI-RT).  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 card say Y.
+	  Otherwise say N.
+
 config TIFM_CORE
 	tristate "TI Flash Media interface support (EXPERIMENTAL)"
 	depends on EXPERIMENTAL

drivers/misc/Makefile

@@ -9,3 +9,4 @@ obj-$(CONFIG_MSI_LAPTOP)     += msi-laptop.o
 obj-$(CONFIG_LKDTM)		+= lkdtm.o
 obj-$(CONFIG_TIFM_CORE)       	+= tifm_core.o
 obj-$(CONFIG_TIFM_7XX1)       	+= tifm_7xx1.o
+obj-$(CONFIG_SGI_IOC4)		+= ioc4.o

drivers/sn/ioc4.c → drivers/misc/ioc4.c

@@ -32,9 +32,6 @@
 #include <linux/ktime.h>
 #include <linux/mutex.h>
 #include <linux/time.h>
-#include <asm/sn/addrs.h>
-#include <asm/sn/clksupport.h>
-#include <asm/sn/shub_mmr.h>
 
 /***************
  * Definitions *
@@ -208,10 +205,12 @@ ioc4_clock_calibrate(struct ioc4_driver_data *idd)
 		       IOC4_CALIBRATE_DEFAULT / IOC4_EXTINT_COUNT_DIVISOR);
 		period = IOC4_CALIBRATE_DEFAULT;
 	} else {
+		u64 ns = period;
+
+		do_div(ns, IOC4_EXTINT_COUNT_DIVISOR);
 		printk(KERN_DEBUG
-		       "IOC4 %s: PCI clock is %ld ns.\n",
-		       pci_name(idd->idd_pdev),
-		       period / IOC4_EXTINT_COUNT_DIVISOR);
+		       "IOC4 %s: PCI clock is %lld ns.\n",
+		       pci_name(idd->idd_pdev), ns);
 	}
 
 	/* Remember results.  We store the extint clock period rather

drivers/serial/ioc4_serial.c

@@ -2935,7 +2935,7 @@ static void __devexit ioc4_serial_exit(void)
 	uart_unregister_driver(&ioc4_uart_rs422);
 }
 
-module_init(ioc4_serial_init);
+late_initcall(ioc4_serial_init); /* Call only after tty init is done */
 module_exit(ioc4_serial_exit);
 
 MODULE_AUTHOR("Pat Gefre - Silicon Graphics Inc. (SGI) <pfg@sgi.com>");

drivers/sn/Kconfig

@@ -5,18 +5,6 @@
 menu "SN Devices"
 	depends on SGI_SN
 
-config SGI_IOC4
-	tristate "SGI IOC4 Base IO support"
-	default m
-	---help---
-	This option enables basic support for the IOC4 chip on certain
-	SGI IO controller cards (IO9, IO10, and PCI-RT).  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 card say Y.
-	Otherwise say N.
-
 config SGI_IOC3
 	tristate "SGI IOC3 Base IO support"
 	default m

drivers/sn/Makefile

@@ -3,5 +3,4 @@
 #
 #
 
-obj-$(CONFIG_SGI_IOC4) += ioc4.o
 obj-$(CONFIG_SGI_IOC3) += ioc3.o