/* * Beat hypervisor console driver * * (C) Copyright 2006 TOSHIBA CORPORATION * * This code is based on drivers/char/hvc_rtas.c: * (C) Copyright IBM Corporation 2001-2005 * (C) Copyright Red Hat, Inc. 2005 * * 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/module.h> #include <linux/init.h> #include <linux/err.h> #include <linux/string.h> #include <linux/console.h> #include <asm/prom.h> #include <asm/hvconsole.h> #include <asm/firmware.h> #include "hvc_console.h" extern int64_t beat_get_term_char(uint64_t, uint64_t *, uint64_t *, uint64_t *); extern int64_t beat_put_term_char(uint64_t, uint64_t, uint64_t, uint64_t); struct hvc_struct *hvc_beat_dev = NULL; /* bug: only one queue is available regardless of vtermno */ static int hvc_beat_get_chars(uint32_t vtermno, char *buf, int cnt) { static unsigned char q[sizeof(unsigned long) * 2] __attribute__((aligned(sizeof(unsigned long)))); static int qlen = 0; unsigned long got; again: if (qlen) { if (qlen > cnt) { memcpy(buf, q, cnt); qlen -= cnt; memmove(q + cnt, q, qlen); return cnt; } else { /* qlen <= cnt */ int r; memcpy(buf, q, qlen); r = qlen; qlen = 0; return r; } } if (beat_get_term_char(vtermno, &got, ((unsigned long *)q), ((unsigned long *)q) + 1) == 0) { qlen = got; goto again; } return 0; } static int hvc_beat_put_chars(uint32_t vtermno, const char *buf, int cnt) { unsigned long kb[2]; int rest, nlen; for (rest = cnt; rest > 0; rest -= nlen) { nlen = (rest > 16) ? 16 : rest; memcpy(kb, buf, nlen); beat_put_term_char(vtermno, nlen, kb[0], kb[1]); buf += nlen; } return cnt; } static struct hv_ops hvc_beat_get_put_ops = { .get_chars = hvc_beat_get_chars, .put_chars = hvc_beat_put_chars, }; static int hvc_beat_useit = 1; static int hvc_beat_config(char *p) { hvc_beat_useit = simple_strtoul(p, NULL, 0); return 0; } static int __init hvc_beat_console_init(void) { if (hvc_beat_useit && machine_is_compatible("Beat")) { hvc_instantiate(0, 0, &hvc_beat_get_put_ops); } return 0; } /* temp */ static int __init hvc_beat_init(void) { struct hvc_struct *hp; if (!firmware_has_feature(FW_FEATURE_BEAT)) return -ENODEV; hp = hvc_alloc(0, NO_IRQ, &hvc_beat_get_put_ops, 16); if (IS_ERR(hp)) return PTR_ERR(hp); hvc_beat_dev = hp; return 0; } static void __exit hvc_beat_exit(void) { if (hvc_beat_dev) hvc_remove(hvc_beat_dev); } module_init(hvc_beat_init); module_exit(hvc_beat_exit); __setup("hvc_beat=", hvc_beat_config); console_initcall(hvc_beat_console_init);