1/* 2 * Copyright 2006, Broadcom Corporation 3 * All Rights Reserved. 4 * 5 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY 6 * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM 7 * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS 8 * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE. 9 * 10 * Carsten Langgaard, carstenl@mips.com 11 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. 12 * 13 * ######################################################################## 14 * 15 * This program is free software; you can distribute it and/or modify it 16 * under the terms of the GNU General Public License (Version 2) as 17 * published by the Free Software Foundation. 18 * 19 * This program is distributed in the hope it will be useful, but WITHOUT 20 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 21 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 22 * for more details. 23 * 24 * You should have received a copy of the GNU General Public License along 25 * with this program; if not, write to the Free Software Foundation, Inc., 26 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 27 * 28 * ######################################################################## 29 * 30 * This is the interface to the remote debugger stub. 31 * 32 */ 33 34#include <linux/serialP.h> 35#include <linux/serial_reg.h> 36 37#include <asm/serial.h> 38#include <asm/io.h> 39 40static struct async_struct kdb_port_info = {0}; 41 42static __inline__ unsigned int serial_in(struct async_struct *info, int offset) 43{ 44 return readb((unsigned long) info->iomem_base + 45 (offset<<info->iomem_reg_shift)); 46} 47 48static __inline__ void serial_out(struct async_struct *info, int offset, 49 int value) 50{ 51 writeb(value, (unsigned long) info->iomem_base + 52 (offset<<info->iomem_reg_shift)); 53} 54 55void rs_kgdb_hook(struct serial_state *ser) { 56 int t; 57 58 kdb_port_info.state = ser; 59 kdb_port_info.magic = SERIAL_MAGIC; 60 kdb_port_info.port = ser->port; 61 kdb_port_info.flags = ser->flags; 62 kdb_port_info.iomem_base = ser->iomem_base; 63 kdb_port_info.iomem_reg_shift = ser->iomem_reg_shift; 64 kdb_port_info.MCR = UART_MCR_DTR | UART_MCR_RTS; 65 66 /* 67 * Clear all interrupts 68 */ 69 serial_in(&kdb_port_info, UART_LSR); 70 serial_in(&kdb_port_info, UART_RX); 71 serial_in(&kdb_port_info, UART_IIR); 72 serial_in(&kdb_port_info, UART_MSR); 73 74 /* 75 * Now, initialize the UART 76 */ 77 serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8); /* reset DLAB */ 78 serial_out(&kdb_port_info, UART_MCR, kdb_port_info.MCR); 79 80 /* 81 * and set the speed of the serial port 82 * (currently hardwired to 115200 8N1 83 */ 84 85 /* baud rate is fixed to 115200 (is this sufficient?)*/ 86 t = kdb_port_info.state->baud_base / 115200; 87 /* set DLAB */ 88 serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8 | UART_LCR_DLAB); 89 serial_out(&kdb_port_info, UART_DLL, t & 0xff);/* LS of divisor */ 90 serial_out(&kdb_port_info, UART_DLM, t >> 8); /* MS of divisor */ 91 /* reset DLAB */ 92 serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8); 93} 94 95int putDebugChar(char c) 96{ 97 98 if (!kdb_port_info.state) { /* need to init device first */ 99 return 0; 100 } 101 102 while ((serial_in(&kdb_port_info, UART_LSR) & UART_LSR_THRE) == 0) 103 ; 104 105 serial_out(&kdb_port_info, UART_TX, c); 106 107 return 1; 108} 109 110char getDebugChar(void) 111{ 112 if (!kdb_port_info.state) { /* need to init device first */ 113 return 0; 114 } 115 116 while (!(serial_in(&kdb_port_info, UART_LSR) & 1)) 117 ; 118 119 return(serial_in(&kdb_port_info, UART_RX)); 120} 121