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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [char/] [hvc_beat.c] - Blame information for rev 65

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Line No. Rev Author Line
1 62 marcus.erl
/*
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 * Beat hypervisor console driver
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 *
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 * (C) Copyright 2006 TOSHIBA CORPORATION
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 *
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 * This code is based on drivers/char/hvc_rtas.c:
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 * (C) Copyright IBM Corporation 2001-2005
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 * (C) Copyright Red Hat, Inc. 2005
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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/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <linux/console.h>
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#include <asm/prom.h>
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#include <asm/hvconsole.h>
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#include <asm/firmware.h>
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#include "hvc_console.h"
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extern int64_t beat_get_term_char(uint64_t, uint64_t *, uint64_t *, uint64_t *);
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extern int64_t beat_put_term_char(uint64_t, uint64_t, uint64_t, uint64_t);
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struct hvc_struct *hvc_beat_dev = NULL;
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/* bug: only one queue is available regardless of vtermno */
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static int hvc_beat_get_chars(uint32_t vtermno, char *buf, int cnt)
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{
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        static unsigned char q[sizeof(unsigned long) * 2]
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                __attribute__((aligned(sizeof(unsigned long))));
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        static int qlen = 0;
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        unsigned long got;
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again:
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        if (qlen) {
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                if (qlen > cnt) {
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                        memcpy(buf, q, cnt);
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                        qlen -= cnt;
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                        memmove(q + cnt, q, qlen);
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                        return cnt;
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                } else {        /* qlen <= cnt */
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                        int     r;
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                        memcpy(buf, q, qlen);
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                        r = qlen;
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                        qlen = 0;
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                        return r;
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                }
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        }
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        if (beat_get_term_char(vtermno, &got,
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                ((unsigned long *)q), ((unsigned long *)q) + 1) == 0) {
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                qlen = got;
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                goto again;
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        }
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        return 0;
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}
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static int hvc_beat_put_chars(uint32_t vtermno, const char *buf, int cnt)
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{
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        unsigned long kb[2];
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        int rest, nlen;
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        for (rest = cnt; rest > 0; rest -= nlen) {
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                nlen = (rest > 16) ? 16 : rest;
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                memcpy(kb, buf, nlen);
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                beat_put_term_char(vtermno, rest, kb[0], kb[1]);
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                rest -= nlen;
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        }
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        return cnt;
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}
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static struct hv_ops hvc_beat_get_put_ops = {
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        .get_chars = hvc_beat_get_chars,
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        .put_chars = hvc_beat_put_chars,
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};
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static int hvc_beat_useit = 1;
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static int hvc_beat_config(char *p)
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{
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        hvc_beat_useit = simple_strtoul(p, NULL, 0);
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        return 0;
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}
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static int __init hvc_beat_console_init(void)
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{
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        if (hvc_beat_useit && machine_is_compatible("Beat")) {
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                hvc_instantiate(0, 0, &hvc_beat_get_put_ops);
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        }
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        return 0;
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}
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/* temp */
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static int __init hvc_beat_init(void)
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{
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        struct hvc_struct *hp;
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        if (!firmware_has_feature(FW_FEATURE_BEAT))
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                return -ENODEV;
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        hp = hvc_alloc(0, NO_IRQ, &hvc_beat_get_put_ops, 16);
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        if (IS_ERR(hp))
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                return PTR_ERR(hp);
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        hvc_beat_dev = hp;
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        return 0;
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}
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static void __exit hvc_beat_exit(void)
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{
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        if (hvc_beat_dev)
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                hvc_remove(hvc_beat_dev);
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}
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module_init(hvc_beat_init);
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module_exit(hvc_beat_exit);
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__setup("hvc_beat=", hvc_beat_config);
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console_initcall(hvc_beat_console_init);

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