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58 lines
1.4 KiB
58 lines
1.4 KiB
// 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 <[email protected]> |
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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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