[PATCH] Mux driver for PA-RISC

A driver for the Mux serial ports in some PA-RISC servers from Ryan Bradetich.

drivers/serial/Kconfig

@@ -317,6 +317,44 @@ config SERIAL_SUNSU
 	  mouse on (PCI) UltraSPARC systems.  Say Y or M if you want to be able
 	  to these serial ports.
 
+config SERIAL_MUX
+	tristate "Serial MUX support"
+	depends on PARISC
+	default y
+	---help---
+	  Saying Y here will enable the hardware MUX serial driver for
+	  the Nova and K class systems.  The hardware MUX is not 8250/16550 
+	  compatible therefore the /dev/ttyB0 device is shared between the 
+	  Serial MUX and the PDC software console.  The following steps 
+	  need to be completed to use the Serial MUX:
+
+	    1. create the device entry (mknod /dev/ttyB0 c 11 0)
+	    2. Edit the /etc/inittab to start a getty listening on /dev/ttyB0
+	    3. Add device ttyB0 to /etc/securetty (if you want to log on as
+		 root on this console.)
+	    4. Change the kernel command console parameter to: console=ttyB0
+
+config SERIAL_MUX_CONSOLE
+        bool "Support for console on serial MUX"
+        depends on SERIAL_MUX
+        default y
+
+config PDC_CONSOLE
+	bool "PDC software console support"
+	depends on PARISC && !SERIAL_MUX
+	default n
+	help
+	  Saying Y here will enable the software based PDC console to be 
+	  used as the system console.  This is useful for machines in 
+	  which the hardware based console has not been written yet.  The
+	  following steps must be competed to use the PDC console:
+
+	    1. create the device entry (mknod /dev/ttyB0 c 11 0)
+	    2. Edit the /etc/inittab to start a getty listening on /dev/ttyB0
+	    3. Add device ttyB0 to /etc/securetty (if you want to log on as
+		 root on this console.)
+	    4. Change the kernel command console parameter to: console=ttyB0
+
 config SERIAL_SUNSAB
 	tristate "Sun Siemens SAB82532 serial support"
 	depends on (SPARC32 || SPARC64) && PCI
@@ -336,12 +374,12 @@ config V850E_NB85E_UART_CONSOLE
 
 config SERIAL_CORE
 	tristate
-	default m if SERIAL_AMBA!=y && SERIAL_CLPS711X!=y && SERIAL_21285!=y && !SERIAL_SA1100 && !SERIAL_ANAKIN && !SERIAL_UART00 && SERIAL_8250!=y && !SERIAL_ROCKETPORT && !SERIAL_SUNCORE && !V850E_NB85E_UART && (SERIAL_AMBA=m || SERIAL_CLPS711X=m || SERIAL_21285=m || SERIAL_8250=m)
-	default y if SERIAL_AMBA=y || SERIAL_CLPS711X=y || SERIAL_21285=y || SERIAL_SA1100 || SERIAL_ANAKIN || SERIAL_UART00 || SERIAL_8250=y || SERIAL_ROCKETPORT || SERIAL_SUNCORE || V850E_NB85E_UART
+	default m if SERIAL_AMBA!=y && SERIAL_CLPS711X!=y && SERIAL_21285!=y && !SERIAL_SA1100 && !SERIAL_ANAKIN && !SERIAL_UART00 && SERIAL_8250!=y && SERIAL_MUX!=y && !SERIAL_ROCKETPORT && !SERIAL_SUNCORE && !V850E_NB85E_UART && (SERIAL_AMBA=m || SERIAL_CLPS711X=m || SERIAL_21285=m || SERIAL_8250=m || SERIAL_MUX=m)
+	default y if SERIAL_AMBA=y || SERIAL_CLPS711X=y || SERIAL_21285=y || SERIAL_SA1100 || SERIAL_ANAKIN || SERIAL_UART00 || SERIAL_8250=y || SERIAL_MUX=y || SERIAL_ROCKETPORT || SERIAL_SUNCORE || V850E_NB85E_UART
 
 config SERIAL_CORE_CONSOLE
 	bool
-	depends on SERIAL_AMBA_CONSOLE || SERIAL_CLPS711X_CONSOLE || SERIAL_21285_CONSOLE || SERIAL_SA1100_CONSOLE || SERIAL_ANAKIN_CONSOLE || SERIAL_UART00_CONSOLE || SERIAL_8250_CONSOLE || SERIAL_SUNCORE || V850E_NB85E_UART_CONSOLE
+	depends on SERIAL_AMBA_CONSOLE || SERIAL_CLPS711X_CONSOLE || SERIAL_21285_CONSOLE || SERIAL_SA1100_CONSOLE || SERIAL_ANAKIN_CONSOLE || SERIAL_UART00_CONSOLE || SERIAL_8250_CONSOLE || SERIAL_MUX_CONSOLE || SERIAL_SUNCORE || V850E_NB85E_UART_CONSOLE
 	default y
 
 config SERIAL_68328

drivers/serial/Makefile

@@ -24,6 +24,7 @@ obj-$(CONFIG_SERIAL_SUNCORE) += suncore.o
 obj-$(CONFIG_SERIAL_SUNZILOG) += sunzilog.o
 obj-$(CONFIG_SERIAL_SUNSU) += sunsu.o
 obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o
+obj-$(CONFIG_SERIAL_MUX) += mux.o
 obj-$(CONFIG_SERIAL_68328) += 68328serial.o
 obj-$(CONFIG_SERIAL_68360) += 68360serial.o
 obj-$(CONFIG_SERIAL_COLDFIRE) += mcfserial.o

include/linux/major.h

@@ -33,6 +33,7 @@
 #define MD_MAJOR        9
 #define MISC_MAJOR	10
 #define SCSI_CDROM_MAJOR 11
+#define MUX_MAJOR	11	/* PA-RISC only */
 #define QIC02_TAPE_MAJOR 12
 #define XT_DISK_MAJOR	13
 #define SOUND_MAJOR	14