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 Asb��ck <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}
59