uart.c revision 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 
1
2/*
3 * IBM ASM Service Processor Device Driver
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 *
19 * Copyright (C) IBM Corporation, 2004
20 *
21 * Author: Max Asb�ck <amax@us.ibm.com>
22 *
23 */
24
25#include <linux/termios.h>
26#include <linux/tty.h>
27#include <linux/serial_core.h>
28#include <linux/serial.h>
29#include <linux/serial_reg.h>
30#include "ibmasm.h"
31#include "lowlevel.h"
32
33
34void ibmasm_register_uart(struct service_processor *sp)
35{
36	struct serial_struct serial;
37	void __iomem *iomem_base;
38
39	iomem_base = sp->base_address + SCOUT_COM_B_BASE;
40
41	/* read the uart scratch register to determine if the UART
42	 * is dedicated to the service processor or if the OS can use it
43	 */
44	if (0 == readl(iomem_base + UART_SCR)) {
45		dev_info(sp->dev, "IBM SP UART not registered, owned by service processor\n");
46		sp->serial_line = -1;
47		return;
48	}
49
50	memset(&serial, 0, sizeof(serial));
51	serial.irq		= sp->irq;
52	serial.baud_base	= 3686400 / 16;
53	serial.flags		= UPF_AUTOPROBE | UPF_SHARE_IRQ;
54	serial.io_type		= UPIO_MEM;
55	serial.iomem_base	= iomem_base;
56
57	sp->serial_line = register_serial(&serial);
58	if (sp->serial_line < 0) {
59		dev_err(sp->dev, "Failed to register serial port\n");
60		return;
61	}
62	enable_uart_interrupts(sp->base_address);
63}
64
65void ibmasm_unregister_uart(struct service_processor *sp)
66{
67	if (sp->serial_line < 0)
68		return;
69
70	disable_uart_interrupts(sp->base_address);
71	unregister_serial(sp->serial_line);
72}
73