drivers/char/hvc_vio.c

   1 /*
   2  * vio driver interface to hvc_console.c
   3  *
   4  * This code was moved here to allow the remaing code to be reused as a
   5  * generic polling mode with semi-reliable transport driver core to the
   6  * console and tty subsystems.
   7  *
   8  *
   9  * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
  10  * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
  11  * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
  12  * Copyright (C) 2004 IBM Corporation
  13  *
  14  * Additional Author(s):
  15  *  Ryan S. Arnold <rsa@us.ibm.com>
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2 of the License, or
  20  * (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  30  */
  31
  32 #include <linux/types.h>
  33 #include <linux/init.h>
  34 #include <asm/hvconsole.h>
  35 #include <asm/vio.h>
  36 #include <asm/prom.h>
  37
  38 char hvc_driver_name[] = "hvc_console";
  39
  40 static struct vio_device_id hvc_driver_table[] __devinitdata = {
  41         {"serial", "hvterm1"},
  42         { NULL, }
  43 };
  44 MODULE_DEVICE_TABLE(vio, hvc_driver_table);
  45
  46 static int __devinit hvc_vio_probe(struct vio_dev *vdev,
  47                                 const struct vio_device_id *id)
  48 {
  49         struct hvc_struct *hp;
  50
  51         /* probed with invalid parameters. */
  52         if (!vdev || !id)
  53                 return -EPERM;
  54
  55         hp = hvc_alloc(vdev->unit_address, vdev->irq);
  56         if (IS_ERR(hp))
  57                 return PTR_ERR(hp);
  58         dev_set_drvdata(&vdev->dev, hp);
  59
  60         return 0;
  61 }
  62
  63 static int __devexit hvc_vio_remove(struct vio_dev *vdev)
  64 {
  65         struct hvc_struct *hp = dev_get_drvdata(&vdev->dev);
  66
  67         return hvc_remove(hp);
  68 }
  69
  70 static struct vio_driver hvc_vio_driver = {
  71         .name           = hvc_driver_name,
  72         .id_table       = hvc_driver_table,
  73         .probe          = hvc_vio_probe,
  74         .remove         = hvc_vio_remove,
  75         .driver         = {
  76                 .owner  = THIS_MODULE,
  77         }
  78 };
  79
  80 static int hvc_vio_init(void)
  81 {
  82         int rc;
  83
  84         /* Register as a vio device to receive callbacks */
  85         rc = vio_register_driver(&hvc_vio_driver);
  86
  87         return rc;
  88 }
  89 module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
  90
  91 static void hvc_vio_exit(void)
  92 {
  93         vio_unregister_driver(&hvc_vio_driver);
  94 }
  95 module_exit(hvc_vio_exit);
  96
  97 /* the device tree order defines our numbering */
  98 static int hvc_find_vtys(void)
  99 {
 100         struct device_node *vty;
 101         int num_found = 0;
 102
 103         for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
 104                         vty = of_find_node_by_name(vty, "vty")) {
 105                 uint32_t *vtermno;
 106
 107                 /* We have statically defined space for only a certain number
 108                  * of console adapters.
 109                  */
 110                 if (num_found >= MAX_NR_HVC_CONSOLES)
 111                         break;
 112
 113                 vtermno = (uint32_t *)get_property(vty, "reg", NULL);
 114                 if (!vtermno)
 115                         continue;
 116
 117                 if (device_is_compatible(vty, "hvterm1")) {
 118                         hvc_instantiate(*vtermno, num_found);
 119                         ++num_found;
 120                 }
 121         }
 122
 123         return num_found;
 124 }
 125 console_initcall(hvc_find_vtys);