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 34 void ibmasm_register_uart(struct service_processor *sp) 35 { 36 struct uart_8250_port uart; 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(&uart, 0, sizeof(uart)); 51 uart.port.irq = sp->irq; 52 uart.port.uartclk = 3686400; 53 uart.port.flags = UPF_SHARE_IRQ; 54 uart.port.iotype = UPIO_MEM; 55 uart.port.membase = iomem_base; 56 57 sp->serial_line = serial8250_register_8250_port(&uart); 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 65 void 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 } 73