[PATCH] Driver for IBM service processor - updated (1/2)

Here is a device driver for the IBM xSeries RSA service processor.
The ibmasm driver is mainly intended to be used in conjunction with a user space
API and systems management applications that need to get in-band access to
the service processor, such as sending commands or waiting for events.
For the remote video feature the driver relays remote mouse and keyboard
events to user space.
By itself the driver also allows the OS to make use the UART on the service
processor board as a regular serial line.

The user interface to the driver is a custom file system. It does not use sysfs since
the operations on the files are somewhat beyond the one file / one value rule for sysfs.
Since it is not strictly a char driver I put it into the drivers/misc directory.

The patch is fairly big, therefore I split it up into the file system part and the
everything-else part.

Here is the non-filesystem part:

1 files changed, 72 insertions, 0 deletions

diff --git a/drivers/misc/ibmasm/uart.c b/drivers/misc/ibmasm/uart.c
new file mode 100644
index 000000000000..604b87ecaf44
--- /dev/null
+++ b/drivers/misc/ibmasm/uart.c
@@ -0,0 +1,72 @@
+
+/*
+ * IBM ASM Service Processor Device Driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) IBM Corporation, 2004
+ *
+ * Author: Max Asböck <amax@us.ibm.com> 
+ *
+ */
+
+#include <linux/termios.h>
+#include <linux/tty.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/serial_reg.h>
+#include "ibmasm.h"
+#include "lowlevel.h"
+
+
+void ibmasm_register_uart(struct service_processor *sp)
+{
+	struct serial_struct serial;
+	unsigned char *iomem_base;
+
+	iomem_base = sp->base_address + SCOUT_COM_B_BASE;
+
+	/* read the uart scratch register to determine if the UART
+	 * is dedicated to the service processor or if the OS can use it
+	 */
+	if (0 == readl(iomem_base + UART_SCR)) {
+		dev_info(sp->dev, "IBM SP UART not registered, owned by service processor\n");
+		sp->serial_line = -1;
+		return;
+	}
+
+	memset(&serial, 0, sizeof(serial));
+	serial.irq		= sp->irq;
+	serial.baud_base	= 3686400 / 16;
+	serial.flags		= UPF_AUTOPROBE | UPF_SHARE_IRQ;
+	serial.io_type		= UPIO_MEM;
+	serial.iomem_base	= iomem_base;
+
+	sp->serial_line = register_serial(&serial);
+	if (sp->serial_line < 0) {
+		dev_err(sp->dev, "Failed to register serial port\n");
+		return;
+	}
+	enable_uart_interrupts(sp->base_address);
+}
+
+void ibmasm_unregister_uart(struct service_processor *sp)
+{
+	if (sp->serial_line < 0)
+		return;
+
+	disable_uart_interrupts(sp->base_address);
+	unregister_serial(sp->serial_line);
+}