1// SPDX-License-Identifier: GPL-2.0-or-later
 2
 3/*
 4 * IBM ASM Service Processor Device Driver
 5 *
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 6 * Copyright (C) IBM Corporation, 2004
 7 *
 8 * Author: Max Asböck <amax@us.ibm.com>
 
 9 */
10
11#include <linux/termios.h>
12#include <linux/tty.h>
13#include <linux/serial_core.h>
14#include <linux/serial_reg.h>
15#include <linux/serial_8250.h>
16#include "ibmasm.h"
17#include "lowlevel.h"
18
19
20void ibmasm_register_uart(struct service_processor *sp)
21{
22	struct uart_8250_port uart;
23	void __iomem *iomem_base;
24
25	iomem_base = sp->base_address + SCOUT_COM_B_BASE;
26
27	/* read the uart scratch register to determine if the UART
28	 * is dedicated to the service processor or if the OS can use it
29	 */
30	if (0 == readl(iomem_base + UART_SCR)) {
31		dev_info(sp->dev, "IBM SP UART not registered, owned by service processor\n");
32		sp->serial_line = -1;
33		return;
34	}
35
36	memset(&uart, 0, sizeof(uart));
37	uart.port.irq		= sp->irq;
38	uart.port.uartclk	= 3686400;
39	uart.port.flags		= UPF_SHARE_IRQ;
40	uart.port.iotype	= UPIO_MEM;
41	uart.port.membase	= iomem_base;
42
43	sp->serial_line = serial8250_register_8250_port(&uart);
44	if (sp->serial_line < 0) {
45		dev_err(sp->dev, "Failed to register serial port\n");
46		return;
47	}
48	enable_uart_interrupts(sp->base_address);
49}
50
51void ibmasm_unregister_uart(struct service_processor *sp)
52{
53	if (sp->serial_line < 0)
54		return;
55
56	disable_uart_interrupts(sp->base_address);
57	serial8250_unregister_port(sp->serial_line);
58}

 
 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
34void ibmasm_register_uart(struct service_processor *sp)
35{
36	struct uart_port uport;
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(&uport, 0, sizeof(struct uart_port));
51	uport.irq	= sp->irq;
52	uport.uartclk	= 3686400;
53	uport.flags	= UPF_SHARE_IRQ;
54	uport.iotype	= UPIO_MEM;
55	uport.membase	= iomem_base;
56
57	sp->serial_line = serial8250_register_port(&uport);
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	serial8250_unregister_port(sp->serial_line);
72}