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/*

 * 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 __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);