59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* IBM ASM Service Processor Device Driver
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*
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* Copyright (C) IBM Corporation, 2004
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*
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* Author: Max Asböck <amax@us.ibm.com>
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*/
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#include <linux/termios.h>
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#include <linux/tty.h>
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#include <linux/serial_core.h>
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#include <linux/serial_reg.h>
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#include <linux/serial_8250.h>
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#include "ibmasm.h"
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#include "lowlevel.h"
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void ibmasm_register_uart(struct service_processor *sp)
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{
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struct uart_8250_port uart;
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void __iomem *iomem_base;
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iomem_base = sp->base_address + SCOUT_COM_B_BASE;
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/* read the uart scratch register to determine if the UART
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* is dedicated to the service processor or if the OS can use it
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*/
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if (0 == readl(iomem_base + UART_SCR)) {
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dev_info(sp->dev, "IBM SP UART not registered, owned by service processor\n");
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sp->serial_line = -1;
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return;
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}
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memset(&uart, 0, sizeof(uart));
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uart.port.irq = sp->irq;
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uart.port.uartclk = 3686400;
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uart.port.flags = UPF_SHARE_IRQ;
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uart.port.iotype = UPIO_MEM;
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uart.port.membase = iomem_base;
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sp->serial_line = serial8250_register_8250_port(&uart);
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if (sp->serial_line < 0) {
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dev_err(sp->dev, "Failed to register serial port\n");
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return;
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}
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enable_uart_interrupts(sp->base_address);
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}
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void ibmasm_unregister_uart(struct service_processor *sp)
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{
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if (sp->serial_line < 0)
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return;
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disable_uart_interrupts(sp->base_address);
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serial8250_unregister_port(sp->serial_line);
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}
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