Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Carsten Langgaard, carstenl@mips.com |
| 3 | * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. |
| 4 | * |
| 5 | * This program is free software; you can distribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License (Version 2) as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. |
| 17 | * |
| 18 | * This is the interface to the remote debugger stub. |
| 19 | */ |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/serial.h> |
| 22 | #include <linux/serialP.h> |
| 23 | #include <linux/serial_reg.h> |
| 24 | |
| 25 | #include <asm/serial.h> |
| 26 | #include <asm/io.h> |
| 27 | |
Ralf Baechle | 8f6539d | 2006-04-05 09:45:48 +0100 | [diff] [blame] | 28 | static struct serial_state rs_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | SERIAL_PORT_DFNS /* Defined in serial.h */ |
| 30 | }; |
| 31 | |
| 32 | static struct async_struct kdb_port_info = {0}; |
| 33 | |
| 34 | int (*generic_putDebugChar)(char); |
| 35 | char (*generic_getDebugChar)(void); |
| 36 | |
| 37 | static __inline__ unsigned int serial_in(struct async_struct *info, int offset) |
| 38 | { |
| 39 | return inb(info->port + offset); |
| 40 | } |
| 41 | |
| 42 | static __inline__ void serial_out(struct async_struct *info, int offset, |
| 43 | int value) |
| 44 | { |
| 45 | outb(value, info->port+offset); |
| 46 | } |
| 47 | |
| 48 | int rs_kgdb_hook(int tty_no, int speed) { |
| 49 | int t; |
| 50 | struct serial_state *ser = &rs_table[tty_no]; |
| 51 | |
| 52 | kdb_port_info.state = ser; |
| 53 | kdb_port_info.magic = SERIAL_MAGIC; |
| 54 | kdb_port_info.port = ser->port; |
| 55 | kdb_port_info.flags = ser->flags; |
| 56 | |
| 57 | /* |
| 58 | * Clear all interrupts |
| 59 | */ |
| 60 | serial_in(&kdb_port_info, UART_LSR); |
| 61 | serial_in(&kdb_port_info, UART_RX); |
| 62 | serial_in(&kdb_port_info, UART_IIR); |
| 63 | serial_in(&kdb_port_info, UART_MSR); |
| 64 | |
| 65 | /* |
| 66 | * Now, initialize the UART |
| 67 | */ |
| 68 | serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8); /* reset DLAB */ |
| 69 | if (kdb_port_info.flags & ASYNC_FOURPORT) { |
| 70 | kdb_port_info.MCR = UART_MCR_DTR | UART_MCR_RTS; |
| 71 | t = UART_MCR_DTR | UART_MCR_OUT1; |
| 72 | } else { |
| 73 | kdb_port_info.MCR |
| 74 | = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2; |
| 75 | t = UART_MCR_DTR | UART_MCR_RTS; |
| 76 | } |
| 77 | |
| 78 | kdb_port_info.MCR = t; /* no interrupts, please */ |
| 79 | serial_out(&kdb_port_info, UART_MCR, kdb_port_info.MCR); |
| 80 | |
| 81 | /* |
| 82 | * and set the speed of the serial port |
| 83 | */ |
| 84 | if (speed == 0) |
| 85 | speed = 9600; |
| 86 | |
| 87 | t = kdb_port_info.state->baud_base / speed; |
| 88 | /* set DLAB */ |
| 89 | serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8 | UART_LCR_DLAB); |
| 90 | serial_out(&kdb_port_info, UART_DLL, t & 0xff);/* LS of divisor */ |
| 91 | serial_out(&kdb_port_info, UART_DLM, t >> 8); /* MS of divisor */ |
| 92 | /* reset DLAB */ |
| 93 | serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8); |
| 94 | |
| 95 | return speed; |
| 96 | } |
| 97 | |
| 98 | int putDebugChar(char c) |
| 99 | { |
| 100 | return generic_putDebugChar(c); |
| 101 | } |
| 102 | |
| 103 | char getDebugChar(void) |
| 104 | { |
| 105 | return generic_getDebugChar(); |
| 106 | } |
| 107 | |
| 108 | int rs_putDebugChar(char c) |
| 109 | { |
| 110 | |
| 111 | if (!kdb_port_info.state) { /* need to init device first */ |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | while ((serial_in(&kdb_port_info, UART_LSR) & UART_LSR_THRE) == 0) |
| 116 | ; |
| 117 | |
| 118 | serial_out(&kdb_port_info, UART_TX, c); |
| 119 | |
| 120 | return 1; |
| 121 | } |
| 122 | |
| 123 | char rs_getDebugChar(void) |
| 124 | { |
| 125 | if (!kdb_port_info.state) { /* need to init device first */ |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | while (!(serial_in(&kdb_port_info, UART_LSR) & 1)) |
| 130 | ; |
| 131 | |
| 132 | return serial_in(&kdb_port_info, UART_RX); |
| 133 | } |