1/* 2 * udbg function for Beat 3 * 4 * (C) Copyright 2006 TOSHIBA CORPORATION 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 19 */ 20 21#include <linux/kernel.h> 22#include <linux/console.h> 23 24#include <asm/machdep.h> 25#include <asm/prom.h> 26#include <asm/udbg.h> 27 28#include "beat.h" 29 30#define celleb_vtermno 0 31 32static void udbg_putc_beat(char c) 33{ 34 unsigned long rc; 35 36 if (c == '\n') 37 udbg_putc_beat('\r'); 38 39 rc = beat_put_term_char(celleb_vtermno, 1, (uint64_t)c << 56, 0); 40} 41 42/* Buffered chars getc */ 43static long inbuflen; 44static long inbuf[2]; /* must be 2 longs */ 45 46static int udbg_getc_poll_beat(void) 47{ 48 /* The interface is tricky because it may return up to 16 chars. 49 * We save them statically for future calls to udbg_getc(). 50 */ 51 char ch, *buf = (char *)inbuf; 52 int i; 53 long rc; 54 if (inbuflen == 0) { 55 /* get some more chars. */ 56 inbuflen = 0; 57 rc = beat_get_term_char(celleb_vtermno, &inbuflen, inbuf+0, inbuf+1); 58 if (rc != 0) 59 inbuflen = 0; /* otherwise inbuflen is garbage */ 60 } 61 if (inbuflen <= 0 || inbuflen > 16) { 62 /* Catch error case as well as other oddities (corruption) */ 63 inbuflen = 0; 64 return -1; 65 } 66 ch = buf[0]; 67 for (i = 1; i < inbuflen; i++) /* shuffle them down. */ 68 buf[i-1] = buf[i]; 69 inbuflen--; 70 return ch; 71} 72 73static int udbg_getc_beat(void) 74{ 75 int ch; 76 for (;;) { 77 ch = udbg_getc_poll_beat(); 78 if (ch == -1) { 79 /* This shouldn't be needed...but... */ 80 volatile unsigned long delay; 81 for (delay=0; delay < 2000000; delay++) 82 ; 83 } else { 84 return ch; 85 } 86 } 87} 88 89/* call this from early_init() for a working debug console on 90 * vterm capable LPAR machines 91 */ 92void __init udbg_init_debug_beat(void) 93{ 94 udbg_putc = udbg_putc_beat; 95 udbg_getc = udbg_getc_beat; 96 udbg_getc_poll = udbg_getc_poll_beat; 97} 98