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 Asböck <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_reg.h>
29 #include <linux/serial_8250.h>
30 #include "ibmasm.h"
31 #include "lowlevel.h"
32
33
ibmasm_register_uart(struct service_processor * sp)34 void ibmasm_register_uart(struct service_processor *sp)
35 {
36 struct uart_8250_port uart;
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(&uart, 0, sizeof(uart));
51 uart.port.irq = sp->irq;
52 uart.port.uartclk = 3686400;
53 uart.port.flags = UPF_SHARE_IRQ;
54 uart.port.iotype = UPIO_MEM;
55 uart.port.membase = iomem_base;
56
57 sp->serial_line = serial8250_register_8250_port(&uart);
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
ibmasm_unregister_uart(struct service_processor * sp)65 void 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 serial8250_unregister_port(sp->serial_line);
72 }
73