99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
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/*
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* udbg function for Beat
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*
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* (C) Copyright 2006 TOSHIBA CORPORATION
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/kernel.h>
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#include <linux/console.h>
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#include <asm/machdep.h>
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#include <asm/prom.h>
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#include <asm/udbg.h>
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#include "beat.h"
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#define celleb_vtermno 0
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static void udbg_putc_beat(char c)
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{
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unsigned long rc;
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if (c == '\n')
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udbg_putc_beat('\r');
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rc = beat_put_term_char(celleb_vtermno, 1, (uint64_t)c << 56, 0);
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}
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/* Buffered chars getc */
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static u64 inbuflen;
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static u64 inbuf[2]; /* must be 2 u64s */
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static int udbg_getc_poll_beat(void)
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{
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/* The interface is tricky because it may return up to 16 chars.
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* We save them statically for future calls to udbg_getc().
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*/
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char ch, *buf = (char *)inbuf;
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int i;
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long rc;
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if (inbuflen == 0) {
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/* get some more chars. */
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inbuflen = 0;
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rc = beat_get_term_char(celleb_vtermno, &inbuflen,
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inbuf+0, inbuf+1);
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if (rc != 0)
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inbuflen = 0; /* otherwise inbuflen is garbage */
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}
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if (inbuflen <= 0 || inbuflen > 16) {
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/* Catch error case as well as other oddities (corruption) */
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inbuflen = 0;
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return -1;
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}
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ch = buf[0];
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for (i = 1; i < inbuflen; i++) /* shuffle them down. */
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buf[i-1] = buf[i];
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inbuflen--;
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return ch;
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}
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static int udbg_getc_beat(void)
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{
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int ch;
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for (;;) {
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ch = udbg_getc_poll_beat();
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if (ch == -1) {
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/* This shouldn't be needed...but... */
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volatile unsigned long delay;
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for (delay = 0; delay < 2000000; delay++)
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;
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} else {
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return ch;
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}
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}
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}
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/* call this from early_init() for a working debug console on
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* vterm capable LPAR machines
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*/
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void __init udbg_init_debug_beat(void)
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{
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udbg_putc = udbg_putc_beat;
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udbg_getc = udbg_getc_beat;
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udbg_getc_poll = udbg_getc_poll_beat;
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}
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