cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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uart.c (1406B)

      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}