[PATCH] Exar quad port serial

This is on our "Envoy" boxes which we have, according to the documentation, an
"Exar ST16C554/554D Quad UART with 16-byte Fifo's".  The box also has two
other "on-board" serial ports and a modem chip.

The two on-board serial UARTs were being detected along with the first two
Exar UARTs.  The last two Exar UARTs were not showing up and neither was the
modem.

This patch was the only way I could the kernel to see beyond the standard four
serial ports and get all four of the Exar UARTs to show up.

[akpm@osdl.org: build fix]
Signed-off-by:  Paul B Schroeder <pschroeder@uplogix.com>
Cc: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/serial/8250_exar_st16c554.c b/drivers/serial/8250_exar_st16c554.c
new file mode 100644 (file)
index 0000000..567143a
--- /dev/null
+++ b/drivers/serial/8250_exar_st16c554.c
@@ -0,0 +1,52 @@
+/*
+ *  linux/drivers/serial/8250_exar.c
+ *
+ *  Written by Paul B Schroeder < pschroeder "at" uplogix "dot" com >
+ *  Based on 8250_boca.
+ *
+ *  Copyright (C) 2005 Russell King.
+ *  Data taken from include/asm-i386/serial.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/serial_8250.h>
+
+#define PORT(_base,_irq)                               \
+       {                                               \
+               .iobase         = _base,                \
+               .irq            = _irq,                 \
+               .uartclk        = 1843200,              \
+               .iotype         = UPIO_PORT,            \
+               .flags          = UPF_BOOT_AUTOCONF,    \
+       }
+
+static struct plat_serial8250_port exar_data[] = {
+       PORT(0x100, 5),
+       PORT(0x108, 5),
+       PORT(0x110, 5),
+       PORT(0x118, 5),
+       { },
+};
+
+static struct platform_device exar_device = {
+       .name                   = "serial8250",
+       .id                     = PLAT8250_DEV_EXAR_ST16C554,
+       .dev                    = {
+               .platform_data  = exar_data,
+       },
+};
+
+static int __init exar_init(void)
+{
+       return platform_device_register(&exar_device);
+}
+
+module_init(exar_init);
+
+MODULE_AUTHOR("Paul B Schroeder");
+MODULE_DESCRIPTION("8250 serial probe module for Exar cards");
+MODULE_LICENSE("GPL");

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index e936c91640b43e958beb42bfc321b9b73044860f..fc12d5df10e2175f3c6346c7a371ca79da8c6780 100644 (file)
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -210,6 +210,17 @@ config SERIAL_8250_BOCA
          To compile this driver as a module, choose M here: the module
          will be called 8250_boca.
 
+config SERIAL_8250_EXAR_ST16C554
+       tristate "Support Exar ST16C554/554D Quad UART"
+       depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
+       help
+         The Uplogix Envoy TU301 uses this Exar Quad UART.  If you are
+         tinkering with your Envoy TU301, or have a machine with this UART,
+         say Y here.
+
+         To compile this driver as a module, choose M here: the module
+         will be called 8250_exar_st16c554.
+
 config SERIAL_8250_HUB6
        tristate "Support Hub6 cards"
        depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 0dba0017a00661b5e3609f93397758e7a4bda0ec..df3632cd7df92e449cdc90bc61dcddc06d692209 100644 (file)
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_SERIAL_8250_CONSOLE) += 8250_early.o
 obj-$(CONFIG_SERIAL_8250_FOURPORT) += 8250_fourport.o
 obj-$(CONFIG_SERIAL_8250_ACCENT) += 8250_accent.o
 obj-$(CONFIG_SERIAL_8250_BOCA) += 8250_boca.o
+obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554) += 8250_exar_st16c554.o
 obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o
 obj-$(CONFIG_SERIAL_8250_MCA) += 8250_mca.o
 obj-$(CONFIG_SERIAL_8250_AU1X00) += 8250_au1x00.o

diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index 8e9681413726bc5db22b6ffb031870f8bf3e91bf..71310d80c09aae4d866f743baeb6e5ae932651e2 100644 (file)
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -41,6 +41,7 @@ enum {
        PLAT8250_DEV_FOURPORT,
        PLAT8250_DEV_ACCENT,
        PLAT8250_DEV_BOCA,
+       PLAT8250_DEV_EXAR_ST16C554,
        PLAT8250_DEV_HUB6,
        PLAT8250_DEV_MCA,
        PLAT8250_DEV_AU1X00,