1/* 2 * Copyright (C) 2010, Broadcom Corporation. All Rights Reserved. 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 11 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 13 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 * 16 * Carsten Langgaard, carstenl@mips.com 17 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. 18 * 19 * ######################################################################## 20 * 21 * This program is free software; you can distribute it and/or modify it 22 * under the terms of the GNU General Public License (Version 2) as 23 * published by the Free Software Foundation. 24 * 25 * This program is distributed in the hope it will be useful, but WITHOUT 26 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 27 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 28 * for more details. 29 * 30 * You should have received a copy of the GNU General Public License along 31 * with this program; if not, write to the Free Software Foundation, Inc., 32 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 33 * 34 * ######################################################################## 35 * 36 * This is the interface to the remote debugger stub. 37 * 38 */ 39 40#include <linux/serial.h> 41#include <linux/serial_core.h> 42#include <linux/serialP.h> 43#include <linux/serial_reg.h> 44 45#include <asm/serial.h> 46#include <asm/io.h> 47 48static struct async_struct kdb_port_info = {0}; 49 50static __inline__ unsigned int serial_in(struct async_struct *info, int offset) 51{ 52 return readb(info->iomem_base + (offset<<info->iomem_reg_shift)); 53} 54 55static __inline__ void serial_out(struct async_struct *info, int offset, 56 int value) 57{ 58 writeb(value, info->iomem_base + (offset<<info->iomem_reg_shift)); 59} 60 61void rs_kgdb_hook(struct uart_port *ser) { 62 int t; 63 64 kdb_port_info.state = (struct serial_state *)ser; 65 kdb_port_info.magic = SERIAL_MAGIC; 66 kdb_port_info.port = ser->line; 67 kdb_port_info.flags = ser->flags; 68 kdb_port_info.iomem_base = ser->membase; 69 kdb_port_info.iomem_reg_shift = ser->regshift; 70 kdb_port_info.MCR = UART_MCR_DTR | UART_MCR_RTS; 71 72 /* 73 * Clear all interrupts 74 */ 75 serial_in(&kdb_port_info, UART_LSR); 76 serial_in(&kdb_port_info, UART_RX); 77 serial_in(&kdb_port_info, UART_IIR); 78 serial_in(&kdb_port_info, UART_MSR); 79 80 /* 81 * Now, initialize the UART 82 */ 83 serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8); /* reset DLAB */ 84 serial_out(&kdb_port_info, UART_MCR, kdb_port_info.MCR); 85 86 /* 87 * and set the speed of the serial port 88 * (currently hardwired to 115200 8N1 89 */ 90 91 /* baud rate is fixed to 115200 (is this sufficient?)*/ 92 t = ser->uartclk / 115200; 93 /* set DLAB */ 94 serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8 | UART_LCR_DLAB); 95 serial_out(&kdb_port_info, UART_DLL, t & 0xff);/* LS of divisor */ 96 serial_out(&kdb_port_info, UART_DLM, t >> 8); /* MS of divisor */ 97 /* reset DLAB */ 98 serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8); 99} 100 101int putDebugChar(char c) 102{ 103 104 if (!kdb_port_info.state) { /* need to init device first */ 105 return 0; 106 } 107 108 while ((serial_in(&kdb_port_info, UART_LSR) & UART_LSR_THRE) == 0) 109 ; 110 111 serial_out(&kdb_port_info, UART_TX, c); 112 113 return 1; 114} 115 116char getDebugChar(void) 117{ 118 if (!kdb_port_info.state) { /* need to init device first */ 119 return 0; 120 } 121 122 while (!(serial_in(&kdb_port_info, UART_LSR) & 1)) 123 ; 124 125 return(serial_in(&kdb_port_info, UART_RX)); 126} 127