1/* Serialport functions for debugging 2 * 3 * Copyright (c) 2000 Axis Communications AB 4 * 5 * Authors: Bjorn Wesen 6 * 7 * Exports: 8 * console_print_etrax(char *buf) 9 * int getDebugChar() 10 * putDebugChar(int) 11 * enableDebugIRQ() 12 * init_etrax_debug() 13 * 14 * $Log: debugport.c,v $ 15 * Revision 1.1.1.1 2008/10/15 03:26:01 james26_jang 16 * Initial. 17 * 18 * Revision 1.1.1.1 2008/07/21 09:14:23 james26_jang 19 * New UI, New QoS, New wireless driver(4.151.10.29), ipmonitor. 20 * 21 * Revision 1.1.1.1 2008/07/02 14:38:30 james26_jang 22 * 4.100.10.29, New QoS and New UI. 23 * 24 * Revision 1.1.1.1 2007/02/15 12:10:52 jiahao 25 * initial update 26 * 27 * Revision 1.1.1.1 2007/01/25 12:51:48 jiahao_jhou 28 * 29 * 30 * Revision 1.1.1.1 2003/02/03 22:37:20 mhuang 31 * LINUX_2_4 branch snapshot from linux-mips.org CVS 32 * 33 * Revision 1.7 2002/04/23 15:35:50 bjornw 34 * Cleaned up sercons struct and removed the waitkey ptr (2.4.19-pre) 35 * 36 * Revision 1.6 2001/04/17 13:58:39 orjanf 37 * * Renamed CONFIG_KGDB to CONFIG_ETRAX_KGDB. 38 * 39 * Revision 1.5 2001/03/26 14:22:05 bjornw 40 * Namechange of some config options 41 * 42 * Revision 1.4 2000/10/06 12:37:26 bjornw 43 * Use physical addresses when talking to DMA 44 * 45 * 46 */ 47 48#include <linux/config.h> 49#include <linux/console.h> 50#include <linux/init.h> 51#include <linux/major.h> 52 53#include <asm/system.h> 54#include <asm/svinto.h> 55#include <asm/io.h> /* Get SIMCOUT. */ 56 57/* Which serial-port is our debug port ? */ 58 59#if defined(CONFIG_ETRAX_DEBUG_PORT0) || defined(CONFIG_ETRAX_DEBUG_PORT_NULL) 60#define DEBUG_PORT_IDX 0 61#define DEBUG_OCMD R_DMA_CH6_CMD 62#define DEBUG_FIRST R_DMA_CH6_FIRST 63#define DEBUG_OCLRINT R_DMA_CH6_CLR_INTR 64#define DEBUG_STATUS R_DMA_CH6_STATUS 65#define DEBUG_READ R_SERIAL0_READ 66#define DEBUG_WRITE R_SERIAL0_TR_DATA 67#define DEBUG_TR_CTRL R_SERIAL0_TR_CTRL 68#define DEBUG_REC_CTRL R_SERIAL0_REC_CTRL 69#define DEBUG_IRQ IO_STATE(R_IRQ_MASK1_SET, ser0_data, set) 70#define DEBUG_DMA_IRQ_CLR IO_STATE(R_IRQ_MASK2_CLR, dma6_descr, clr) 71#endif 72 73#ifdef CONFIG_ETRAX_DEBUG_PORT1 74#define DEBUG_PORT_IDX 1 75#define DEBUG_OCMD R_DMA_CH8_CMD 76#define DEBUG_FIRST R_DMA_CH8_FIRST 77#define DEBUG_OCLRINT R_DMA_CH8_CLR_INTR 78#define DEBUG_STATUS R_DMA_CH8_STATUS 79#define DEBUG_READ R_SERIAL1_READ 80#define DEBUG_WRITE R_SERIAL1_TR_DATA 81#define DEBUG_TR_CTRL R_SERIAL1_TR_CTRL 82#define DEBUG_REC_CTRL R_SERIAL1_REC_CTRL 83#define DEBUG_IRQ IO_STATE(R_IRQ_MASK1_SET, ser1_data, set) 84#define DEBUG_DMA_IRQ_CLR IO_STATE(R_IRQ_MASK2_CLR, dma8_descr, clr) 85#endif 86 87#ifdef CONFIG_ETRAX_DEBUG_PORT2 88#define DEBUG_PORT_IDX 2 89#define DEBUG_OCMD R_DMA_CH2_CMD 90#define DEBUG_FIRST R_DMA_CH2_FIRST 91#define DEBUG_OCLRINT R_DMA_CH2_CLR_INTR 92#define DEBUG_STATUS R_DMA_CH2_STATUS 93#define DEBUG_READ R_SERIAL2_READ 94#define DEBUG_WRITE R_SERIAL2_TR_DATA 95#define DEBUG_TR_CTRL R_SERIAL2_TR_CTRL 96#define DEBUG_REC_CTRL R_SERIAL2_REC_CTRL 97#define DEBUG_IRQ IO_STATE(R_IRQ_MASK1_SET, ser2_data, set) 98#define DEBUG_DMA_IRQ_CLR IO_STATE(R_IRQ_MASK2_CLR, dma2_descr, clr) 99#endif 100 101#ifdef CONFIG_ETRAX_DEBUG_PORT3 102#define DEBUG_PORT_IDX 3 103#define DEBUG_OCMD R_DMA_CH4_CMD 104#define DEBUG_FIRST R_DMA_CH4_FIRST 105#define DEBUG_OCLRINT R_DMA_CH4_CLR_INTR 106#define DEBUG_STATUS R_DMA_CH4_STATUS 107#define DEBUG_READ R_SERIAL3_READ 108#define DEBUG_WRITE R_SERIAL3_TR_DATA 109#define DEBUG_TR_CTRL R_SERIAL3_TR_CTRL 110#define DEBUG_REC_CTRL R_SERIAL3_REC_CTRL 111#define DEBUG_IRQ IO_STATE(R_IRQ_MASK1_SET, ser3_data, set) 112#define DEBUG_DMA_IRQ_CLR IO_STATE(R_IRQ_MASK2_CLR, dma4_descr, clr) 113#endif 114 115/* Write a string of count length to the console (debug port) using DMA, polled 116 * for completion. Interrupts are disabled during the whole process. Some 117 * caution needs to be taken to not interfere with ttyS business on this port. 118 */ 119 120static void 121console_write(struct console *co, const char *buf, unsigned int len) 122{ 123 static struct etrax_dma_descr descr; 124 unsigned long flags; 125 int in_progress; 126 127#ifdef CONFIG_ETRAX_DEBUG_PORT_NULL 128 /* no debug printout at all */ 129 return; 130#endif 131 132#ifdef CONFIG_SVINTO_SIM 133 /* no use to simulate the serial debug output */ 134 SIMCOUT(buf,len); 135 return; 136#endif 137 138 save_flags(flags); 139 cli(); 140 141#ifdef CONFIG_ETRAX_KGDB 142 /* kgdb needs to output debug info using the gdb protocol */ 143 putDebugString(buf, len); 144 restore_flags(flags); 145 return; 146#endif 147 148 /* make sure the transmitter is enabled. 149 * NOTE: this overrides any setting done in ttySx, to 8N1, no auto-CTS. 150 * in the future, move the tr/rec_ctrl shadows from etrax100ser.c to 151 * shadows.c and use it here as well... 152 */ 153 154 *DEBUG_TR_CTRL = 0x40; 155 156 /* if the tty has some ongoing business, remember it */ 157 158 in_progress = *DEBUG_OCMD & 7; 159 160 if(in_progress) { 161 /* wait until the output dma channel is ready */ 162 163 while(*DEBUG_OCMD & 7) /* nothing */ ; 164 } 165 166 descr.ctrl = d_eol; 167 descr.sw_len = len; 168 descr.buf = __pa(buf); 169 170 *DEBUG_FIRST = __pa(&descr); /* write to R_DMAx_FIRST */ 171 *DEBUG_OCMD = 1; /* dma command start -> R_DMAx_CMD */ 172 173 /* wait until the output dma channel is ready again */ 174 175 while(*DEBUG_OCMD & 7) /* nothing */; 176 177 /* clear pending interrupts so we don't get a surprise below */ 178 179 if(in_progress) 180 *DEBUG_OCLRINT = 2; /* only clear EOP, leave DESCR for the tty */ 181 else 182 *DEBUG_OCLRINT = 3; /* clear both EOP and DESCR */ 183 184 while(*DEBUG_STATUS & 0x7f); /* wait until output FIFO is empty as well */ 185 186 restore_flags(flags); 187} 188 189/* legacy function */ 190 191void 192console_print_etrax(const char *buf) 193{ 194 console_write(NULL, buf, strlen(buf)); 195} 196 197/* Use polling to get a single character FROM the debug port */ 198 199int 200getDebugChar(void) 201{ 202 unsigned long readval; 203 204 do { 205 readval = *DEBUG_READ; 206 } while(!(readval & IO_MASK(R_SERIAL0_READ, data_avail))); 207 208 return (readval & IO_MASK(R_SERIAL0_READ, data_in)); 209} 210 211/* Use polling to put a single character to the debug port */ 212 213void 214putDebugChar(int val) 215{ 216 while(!(*DEBUG_READ & IO_MASK(R_SERIAL0_READ, tr_ready))) ; 217; 218 *DEBUG_WRITE = val; 219} 220 221/* Enable irq for receiving chars on the debug port, used by kgdb */ 222 223void 224enableDebugIRQ(void) 225{ 226 *R_IRQ_MASK1_SET = DEBUG_IRQ; 227 /* use R_VECT_MASK directly, since we really bypass Linux normal 228 * IRQ handling in kgdb anyway, we don't need to use enable_irq 229 */ 230 *R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set); 231 232 *DEBUG_REC_CTRL = IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable); 233} 234 235static kdev_t 236console_device(struct console *c) 237{ 238 return MKDEV(TTY_MAJOR, 64 + c->index); 239} 240 241static int __init 242console_setup(struct console *co, char *options) 243{ 244 return 0; 245} 246 247static struct console sercons = { 248 name : "ttyS", 249 write: console_write, 250 read : NULL, 251 device : console_device, 252 unblank : NULL, 253 setup : console_setup, 254 flags : CON_PRINTBUFFER, 255 index : DEBUG_PORT_IDX, 256 cflag : 0, 257 next : NULL 258}; 259 260/* 261 * Register console (for printk's etc) 262 */ 263 264void __init 265init_etrax_debug(void) 266{ 267 register_console(&sercons); 268} 269