zs: move to the serial subsystem

This is a reimplementation of the zs driver for the serial subsystem.  Any
resemblance to the old driver is purely coincidential.  ;-) I do hope I got
the handling of modem lines right -- better do not tackle me about the
issue unless you feel too good...

Any users of the old driver: please note the numbers of the serial lines
have now been swapped, i.e.  ttyS0 <-> ttyS1 and ttyS2 <-> ttyS3.  It has
to do with the modem lines mentioned above; basically the port A in a given
chip has to be initialised before the port B if you want to use the latter
as the serial console (which is usually the case), as operations on modem
lines of the serial line associated with the port B access both ports (see
the comment at the top of the driver for the details of wiring used).
Please update your scripts.

This is also the reason each SCC now requests an IRQ once only (as seen in
"/proc/interrupts") -- the handler takes care of both ports at once as the
line associated with the port B has to take status update interrupts from
both ports (and yet the line of the port A takes its own for itself too).
The old driver never got it right...

Signed-off-by: Maciej W. Rozycki <[email protected]>
Cc: Ralf Baechle <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

MAINTAINERS

@@ -4110,6 +4110,11 @@ W:	http://www.polyware.nl/~middelin/En/hobbies.html
 W:	http://www.polyware.nl/~middelin/hobbies.html
 S:	Maintained
 
+ZS DECSTATION Z85C30 SERIAL DRIVER
+P:	Maciej W. Rozycki
+M:	[email protected]
+S:	Maintained
+
 THE REST
 P:	Linus Torvalds
 S:	Buried alive in reporters

drivers/char/Kconfig

@@ -372,39 +372,6 @@ config ISTALLION
 	  To compile this driver as a module, choose M here: the
 	  module will be called istallion.
 
-config SERIAL_DEC
-	bool "DECstation serial support"
-	depends on MACH_DECSTATION
-	default y
-	help
-	  This selects whether you want to be asked about drivers for
-	  DECstation serial ports.
-
-	  Note that the answer to this question won't directly affect the
-	  kernel: saying N will just cause the configurator to skip all
-	  the questions about DECstation serial ports.
-
-config SERIAL_DEC_CONSOLE
-	bool "Support for console on a DECstation serial port"
-	depends on SERIAL_DEC
-	default y
-	help
-	  If you say Y here, it will be possible to use a serial port as the
-	  system console (the system console is the device which receives all
-	  kernel messages and warnings and which allows logins in single user
-	  mode).  Note that the firmware uses ttyS0 as the serial console on
-	  the Maxine and ttyS2 on the others.
-
-	  If unsure, say Y.
-
-config ZS
-	bool "Z85C30 Serial Support"
-	depends on SERIAL_DEC
-	default y
-	help
-	  Documentation on the Zilog 85C350 serial communications controller
-	  is downloadable at <http://www.zilog.com/pdfs/serial/z85c30.pdf>
-
 config A2232
 	tristate "Commodore A2232 serial support (EXPERIMENTAL)"
 	depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP

drivers/serial/Kconfig

@@ -486,6 +486,36 @@ config SERIAL_DZ_CONSOLE
 
 	  If unsure, say Y.
 
+config SERIAL_ZS
+	tristate "DECstation Z85C30 serial support"
+	depends on MACH_DECSTATION
+	select SERIAL_CORE
+	default y
+	---help---
+	  Support for the Zilog 85C350 serial communications controller used
+	  for serial ports in newer DECstation systems.  These include the
+	  DECsystem 5900 and all models of the DECstation and DECsystem 5000
+	  systems except from model 200.
+
+	  If unsure, say Y.  To compile this driver as a module, choose M here:
+	  the module will be called zs.
+
+config SERIAL_ZS_CONSOLE
+	bool "Support for console on a DECstation Z85C30 serial port"
+	depends on SERIAL_ZS=y
+	select SERIAL_CORE_CONSOLE
+	default y
+	---help---
+	  If you say Y here, it will be possible to use a serial port as the
+	  system console (the system console is the device which receives all
+	  kernel messages and warnings and which allows logins in single user
+	  mode).
+
+	  Note that the firmware uses ttyS1 as the serial console on the
+	  Maxine and ttyS3 on the others using this driver.
+
+	  If unsure, say Y.
+
 config SERIAL_21285
 	tristate "DC21285 serial port support"
 	depends on ARM && FOOTBRIDGE

drivers/serial/Makefile

@@ -43,6 +43,7 @@ obj-$(CONFIG_V850E_UART) += v850e_uart.o
 obj-$(CONFIG_SERIAL_PMACZILOG) += pmac_zilog.o
 obj-$(CONFIG_SERIAL_LH7A40X) += serial_lh7a40x.o
 obj-$(CONFIG_SERIAL_DZ) += dz.o
+obj-$(CONFIG_SERIAL_ZS) += zs.o
 obj-$(CONFIG_SERIAL_SH_SCI) += sh-sci.o
 obj-$(CONFIG_SERIAL_SGI_L1_CONSOLE) += sn_console.o
 obj-$(CONFIG_SERIAL_CPM) += cpm_uart/