1/* 2 * Generic 16550 kgdb support intended to be useful on a variety 3 * of platforms. To enable this support, it is necessary to set 4 * the CONFIG_GEN550 option. Any virtual mapping of the serial 5 * port(s) to be used can be accomplished by setting 6 * ppc_md.early_serial_map to a platform-specific mapping function. 7 * 8 * Adapted from ppc4xx_kgdb.c. 9 * 10 * Author: Matt Porter <mporter@kernel.crashing.org> 11 * 12 * 2002-2004 (c) MontaVista Software, Inc. This file is licensed under 13 * the terms of the GNU General Public License version 2. This program 14 * is licensed "as is" without any warranty of any kind, whether express 15 * or implied. 16 */ 17 18#include <linux/types.h> 19#include <linux/kernel.h> 20 21#include <asm/machdep.h> 22 23extern unsigned long serial_init(int, void *); 24extern unsigned long serial_getc(unsigned long); 25extern unsigned long serial_putc(unsigned long, unsigned char); 26 27#if defined(CONFIG_KGDB_TTYS0) 28#define KGDB_PORT 0 29#elif defined(CONFIG_KGDB_TTYS1) 30#define KGDB_PORT 1 31#elif defined(CONFIG_KGDB_TTYS2) 32#define KGDB_PORT 2 33#elif defined(CONFIG_KGDB_TTYS3) 34#define KGDB_PORT 3 35#else 36#error "invalid kgdb_tty port" 37#endif 38 39static volatile unsigned int kgdb_debugport; 40 41void putDebugChar(unsigned char c) 42{ 43 if (kgdb_debugport == 0) 44 kgdb_debugport = serial_init(KGDB_PORT, NULL); 45 46 serial_putc(kgdb_debugport, c); 47} 48 49int getDebugChar(void) 50{ 51 if (kgdb_debugport == 0) 52 kgdb_debugport = serial_init(KGDB_PORT, NULL); 53 54 return(serial_getc(kgdb_debugport)); 55} 56 57void kgdb_interruptible(int enable) 58{ 59 return; 60} 61 62void putDebugString(char* str) 63{ 64 while (*str != '\0') { 65 putDebugChar(*str); 66 str++; 67 } 68 putDebugChar('\r'); 69 return; 70} 71 72/* 73 * Note: gen550_init() must be called already on the port we are going 74 * to use. 75 */ 76void 77gen550_kgdb_map_scc(void) 78{ 79 printk(KERN_DEBUG "kgdb init\n"); 80 if (ppc_md.early_serial_map) 81 ppc_md.early_serial_map(); 82 kgdb_debugport = serial_init(KGDB_PORT, NULL); 83} 84