diff options
author | Ishizaki Kou <kou.ishizaki@toshiba.co.jp> | 2007-02-02 07:44:08 (GMT) |
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committer | Paul Mackerras <paulus@samba.org> | 2007-02-07 03:03:21 (GMT) |
commit | 3cdc20e51791bd2fd67781e65640a4650f99c63e (patch) | |
tree | f5597a6ae04f3579140fd1e968c3bdfc8bed0aaf /drivers/char/hvc_beat.c | |
parent | d7480a9feaa970d9c37462f21bc27ebab2c56b0b (diff) | |
download | linux-3cdc20e51791bd2fd67781e65640a4650f99c63e.tar.xz |
[POWERPC] Celleb: hypervisor console driver
This patch adds hypervisor console driver for Celleb platform.
Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'drivers/char/hvc_beat.c')
-rw-r--r-- | drivers/char/hvc_beat.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/drivers/char/hvc_beat.c b/drivers/char/hvc_beat.c new file mode 100644 index 0000000..6f019f1 --- /dev/null +++ b/drivers/char/hvc_beat.c @@ -0,0 +1,134 @@ +/* + * 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, rest, kb[0], kb[1]); + rest -= 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 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 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); |