Subversion Repositories test_project

/*

 * vio driver interface to hvc_console.c

 *

 * This code was moved here to allow the remaing code to be reused as a

 * generic polling mode with semi-reliable transport driver core to the

 * console and tty subsystems.

 *

 *

 * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM

 * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM

 * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.

 * Copyright (C) 2004 IBM Corporation

 *

 * Additional Author(s):

 *  Ryan S. Arnold <rsa@us.ibm.com>

 *

 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

 */

#include <linux/types.h>

#include <linux/init.h>

#include <asm/hvconsole.h>

#include <asm/vio.h>

#include <asm/prom.h>

#include <asm/firmware.h>

#include "hvc_console.h"

char hvc_driver_name[] = "hvc_console";

static struct vio_device_id hvc_driver_table[] __devinitdata = {

        {"serial", "hvterm1"},

        { "", "" }

};

MODULE_DEVICE_TABLE(vio, hvc_driver_table);

static int filtered_get_chars(uint32_t vtermno, char *buf, int count)

{

        unsigned long got;

        int i;

        /*

         * Vio firmware will read up to SIZE_VIO_GET_CHARS at its own discretion

         * so we play safe and avoid the situation where got > count which could

         * overload the flip buffer.

         */

        if (count < SIZE_VIO_GET_CHARS)

                return -EAGAIN;

        got = hvc_get_chars(vtermno, buf, count);

        /*

         * Work around a HV bug where it gives us a null

         * after every \r.  -- paulus

         */

        for (i = 1; i < got; ++i) {

                if (buf[i] == 0 && buf[i-1] == '\r') {

                        --got;

                        if (i < got)

                                memmove(&buf[i], &buf[i+1],

                                        got - i);

                }

        }

        return got;

}

static struct hv_ops hvc_get_put_ops = {

        .get_chars = filtered_get_chars,

        .put_chars = hvc_put_chars,

};

static int __devinit hvc_vio_probe(struct vio_dev *vdev,

                                const struct vio_device_id *id)

{

        struct hvc_struct *hp;

        /* probed with invalid parameters. */

        if (!vdev || !id)

                return -EPERM;

        hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,

                        MAX_VIO_PUT_CHARS);

        if (IS_ERR(hp))

                return PTR_ERR(hp);

        dev_set_drvdata(&vdev->dev, hp);

        return 0;

}

static int __devexit hvc_vio_remove(struct vio_dev *vdev)

{

        struct hvc_struct *hp = dev_get_drvdata(&vdev->dev);

        return hvc_remove(hp);

}

static struct vio_driver hvc_vio_driver = {

        .id_table       = hvc_driver_table,

        .probe          = hvc_vio_probe,

        .remove         = hvc_vio_remove,

        .driver         = {

                .name   = hvc_driver_name,

                .owner  = THIS_MODULE,

        }

};

static int hvc_vio_init(void)

{

        int rc;

        if (firmware_has_feature(FW_FEATURE_ISERIES))

                return -EIO;

        /* Register as a vio device to receive callbacks */

        rc = vio_register_driver(&hvc_vio_driver);

        return rc;

}

module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */

static void hvc_vio_exit(void)

{

        vio_unregister_driver(&hvc_vio_driver);

}

module_exit(hvc_vio_exit);

/* the device tree order defines our numbering */

static int hvc_find_vtys(void)

{

        struct device_node *vty;

        int num_found = 0;

        for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;

                        vty = of_find_node_by_name(vty, "vty")) {

                const uint32_t *vtermno;

                /* We have statically defined space for only a certain number

                 * of console adapters.

                 */

                if (num_found >= MAX_NR_HVC_CONSOLES)

                        break;

                vtermno = of_get_property(vty, "reg", NULL);

                if (!vtermno)

                        continue;

                if (of_device_is_compatible(vty, "hvterm1")) {

                        hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);

                        ++num_found;

                }

        }

        return num_found;

}

console_initcall(hvc_find_vtys);