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