tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* -*- mode: c; c-basic-offset: 8 -*- */
2
3/*
4 * MCA bus support functions for sysfs.
5 *
6 * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com>
7 *
8**-----------------------------------------------------------------------------
9**
10** This program is free software; you can redistribute it and/or modify
11** it under the terms of the GNU General Public License as published by
12** the Free Software Foundation; either version 2 of the License, or
13** (at your option) any later version.
14**
15** This program is distributed in the hope that it will be useful,
16** but WITHOUT ANY WARRANTY; without even the implied warranty of
17** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18** GNU General Public License for more details.
19**
20** You should have received a copy of the GNU General Public License
21** along with this program; if not, write to the Free Software
22** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23**
24**-----------------------------------------------------------------------------
25 */
26
27#include <linux/kernel.h>
28#include <linux/device.h>
29#include <linux/mca.h>
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/slab.h>
33
34/* Very few machines have more than one MCA bus. However, there are
35 * those that do (Voyager 35xx/5xxx), so we do it this way for future
36 * expansion. None that I know have more than 2 */
37static struct mca_bus *mca_root_busses[MAX_MCA_BUSSES];
38
39#define MCA_DEVINFO(i,s) { .pos = i, .name = s }
40
41struct mca_device_info {
42 short pos_id; /* the 2 byte pos id for this card */
43 char name[DEVICE_NAME_SIZE];
44};
45
46static int mca_bus_match (struct device *dev, struct device_driver *drv)
47{
48 struct mca_device *mca_dev = to_mca_device (dev);
49 struct mca_driver *mca_drv = to_mca_driver (drv);
50 const short *mca_ids = mca_drv->id_table;
51 int i;
52
53 if (!mca_ids)
54 return 0;
55
56 for(i = 0; mca_ids[i]; i++) {
57 if (mca_ids[i] == mca_dev->pos_id) {
58 mca_dev->index = i;
59 return 1;
60 }
61 }
62
63 return 0;
64}
65
66struct bus_type mca_bus_type = {
67 .name = "MCA",
68 .match = mca_bus_match,
69};
70EXPORT_SYMBOL (mca_bus_type);
71
72static ssize_t mca_show_pos_id(struct device *dev, struct device_attribute *attr, char *buf)
73{
74 /* four digits, \n and trailing \0 */
75 struct mca_device *mca_dev = to_mca_device(dev);
76 int len;
77
78 if(mca_dev->pos_id < MCA_DUMMY_POS_START)
79 len = sprintf(buf, "%04x\n", mca_dev->pos_id);
80 else
81 len = sprintf(buf, "none\n");
82 return len;
83}
84static ssize_t mca_show_pos(struct device *dev, struct device_attribute *attr, char *buf)
85{
86 /* enough for 8 two byte hex chars plus space and new line */
87 int j, len=0;
88 struct mca_device *mca_dev = to_mca_device(dev);
89
90 for(j=0; j<8; j++)
91 len += sprintf(buf+len, "%02x ", mca_dev->pos[j]);
92 /* change last trailing space to new line */
93 buf[len-1] = '\n';
94 return len;
95}
96
97static DEVICE_ATTR(id, S_IRUGO, mca_show_pos_id, NULL);
98static DEVICE_ATTR(pos, S_IRUGO, mca_show_pos, NULL);
99
100int __init mca_register_device(int bus, struct mca_device *mca_dev)
101{
102 struct mca_bus *mca_bus = mca_root_busses[bus];
103 int rc;
104
105 mca_dev->dev.parent = &mca_bus->dev;
106 mca_dev->dev.bus = &mca_bus_type;
107 sprintf (mca_dev->dev.bus_id, "%02d:%02X", bus, mca_dev->slot);
108 mca_dev->dma_mask = mca_bus->default_dma_mask;
109 mca_dev->dev.dma_mask = &mca_dev->dma_mask;
110 mca_dev->dev.coherent_dma_mask = mca_dev->dma_mask;
111
112 rc = device_register(&mca_dev->dev);
113 if (rc)
114 goto err_out;
115
116 rc = device_create_file(&mca_dev->dev, &dev_attr_id);
117 if (rc) goto err_out_devreg;
118 rc = device_create_file(&mca_dev->dev, &dev_attr_pos);
119 if (rc) goto err_out_id;
120
121 return 1;
122
123err_out_id:
124 device_remove_file(&mca_dev->dev, &dev_attr_id);
125err_out_devreg:
126 device_unregister(&mca_dev->dev);
127err_out:
128 return 0;
129}
130
131/* */
132struct mca_bus * __devinit mca_attach_bus(int bus)
133{
134 struct mca_bus *mca_bus;
135
136 if (unlikely(mca_root_busses[bus] != NULL)) {
137 /* This should never happen, but just in case */
138 printk(KERN_EMERG "MCA tried to add already existing bus %d\n",
139 bus);
140 dump_stack();
141 return NULL;
142 }
143
144 mca_bus = kzalloc(sizeof(struct mca_bus), GFP_KERNEL);
145 if (!mca_bus)
146 return NULL;
147
148 sprintf(mca_bus->dev.bus_id,"mca%d",bus);
149 sprintf(mca_bus->name,"Host %s MCA Bridge", bus ? "Secondary" : "Primary");
150 if (device_register(&mca_bus->dev)) {
151 kfree(mca_bus);
152 return NULL;
153 }
154
155 mca_root_busses[bus] = mca_bus;
156
157 return mca_bus;
158}
159
160int __init mca_system_init (void)
161{
162 return bus_register(&mca_bus_type);
163}