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164 lines
4.0 KiB
164 lines
4.0 KiB
/*
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* vio driver interface to hvc_console.c
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*
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* This code was moved here to allow the remaing code to be reused as a
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* generic polling mode with semi-reliable transport driver core to the
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* console and tty subsystems.
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*
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*
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* Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
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* Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
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* Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
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* Copyright (C) 2004 IBM Corporation
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*
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* Additional Author(s):
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* Ryan S. Arnold <rsa@us.ibm.com>
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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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <asm/hvconsole.h>
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#include <asm/vio.h>
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#include <asm/prom.h>
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#include "hvc_console.h"
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char hvc_driver_name[] = "hvc_console";
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static struct vio_device_id hvc_driver_table[] __devinitdata = {
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{"serial", "hvterm1"},
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{ "", "" }
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};
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MODULE_DEVICE_TABLE(vio, hvc_driver_table);
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static int filtered_get_chars(uint32_t vtermno, char *buf, int count)
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{
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unsigned long got;
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int i;
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/*
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* Vio firmware will read up to SIZE_VIO_GET_CHARS at its own discretion
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* so we play safe and avoid the situation where got > count which could
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* overload the flip buffer.
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*/
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if (count < SIZE_VIO_GET_CHARS)
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return -EAGAIN;
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got = hvc_get_chars(vtermno, buf, count);
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/*
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* Work around a HV bug where it gives us a null
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* after every \r. -- paulus
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*/
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for (i = 1; i < got; ++i) {
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if (buf[i] == 0 && buf[i-1] == '\r') {
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--got;
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if (i < got)
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memmove(&buf[i], &buf[i+1],
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got - i);
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}
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}
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return got;
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}
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static struct hv_ops hvc_get_put_ops = {
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.get_chars = filtered_get_chars,
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.put_chars = hvc_put_chars,
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};
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static int __devinit hvc_vio_probe(struct vio_dev *vdev,
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const struct vio_device_id *id)
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{
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struct hvc_struct *hp;
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/* probed with invalid parameters. */
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if (!vdev || !id)
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return -EPERM;
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hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
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MAX_VIO_PUT_CHARS);
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if (IS_ERR(hp))
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return PTR_ERR(hp);
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dev_set_drvdata(&vdev->dev, hp);
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return 0;
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}
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static int __devexit hvc_vio_remove(struct vio_dev *vdev)
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{
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struct hvc_struct *hp = dev_get_drvdata(&vdev->dev);
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return hvc_remove(hp);
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}
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static struct vio_driver hvc_vio_driver = {
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.id_table = hvc_driver_table,
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.probe = hvc_vio_probe,
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.remove = hvc_vio_remove,
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.driver = {
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.name = hvc_driver_name,
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.owner = THIS_MODULE,
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}
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};
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static int hvc_vio_init(void)
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{
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int rc;
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/* Register as a vio device to receive callbacks */
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rc = vio_register_driver(&hvc_vio_driver);
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return rc;
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}
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module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
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static void hvc_vio_exit(void)
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{
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vio_unregister_driver(&hvc_vio_driver);
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}
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module_exit(hvc_vio_exit);
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/* the device tree order defines our numbering */
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static int hvc_find_vtys(void)
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{
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struct device_node *vty;
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int num_found = 0;
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for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
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vty = of_find_node_by_name(vty, "vty")) {
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const uint32_t *vtermno;
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/* We have statically defined space for only a certain number
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* of console adapters.
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*/
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if (num_found >= MAX_NR_HVC_CONSOLES)
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break;
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vtermno = get_property(vty, "reg", NULL);
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if (!vtermno)
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continue;
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if (device_is_compatible(vty, "hvterm1")) {
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hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);
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++num_found;
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}
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}
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return num_found;
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}
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console_initcall(hvc_find_vtys);
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