aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mca/mca-bus.c
blob: 67b8e9453b191a2c701970f4ccbdd4a5207dd1e3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/* -*- mode: c; c-basic-offset: 8 -*- */

/*
 * MCA bus support functions for sysfs.
 *
 * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.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., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/mca.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>

/* Very few machines have more than one MCA bus.  However, there are
 * those that do (Voyager 35xx/5xxx), so we do it this way for future
 * expansion.  None that I know have more than 2 */
static struct mca_bus *mca_root_busses[MAX_MCA_BUSSES];

#define MCA_DEVINFO(i,s) { .pos = i, .name = s }

struct mca_device_info {
	short pos_id;		/* the 2 byte pos id for this card */
	char name[DEVICE_NAME_SIZE];
};

static int mca_bus_match (struct device *dev, struct device_driver *drv)
{
	struct mca_device *mca_dev = to_mca_device (dev);
	struct mca_driver *mca_drv = to_mca_driver (drv);
	const unsigned short *mca_ids = mca_drv->id_table;
	int i = 0;

	if (mca_ids) {
		for(i = 0; mca_ids[i]; i++) {
			if (mca_ids[i] == mca_dev->pos_id) {
				mca_dev->index = i;
				return 1;
			}
		}
	}
	/* If the integrated id is present, treat it as though it were an
	 * additional id in the id_table (it can't be because by definition,
	 * integrated id's overflow a short */
	if (mca_drv->integrated_id && mca_dev->pos_id ==
	    mca_drv->integrated_id) {
		mca_dev->index = i;
		return 1;
	}
	return 0;
}

struct bus_type mca_bus_type = {
	.name  = "MCA",
	.match = mca_bus_match,
};
EXPORT_SYMBOL (mca_bus_type);

static ssize_t mca_show_pos_id(struct device *dev, struct device_attribute *attr, char *buf)
{
	/* four digits, \n and trailing \0 */
	struct mca_device *mca_dev = to_mca_device(dev);
	int len;

	if(mca_dev->pos_id < MCA_DUMMY_POS_START)
		len = sprintf(buf, "%04x\n", mca_dev->pos_id);
	else
		len = sprintf(buf, "none\n");
	return len;
}
static ssize_t mca_show_pos(struct device *dev, struct device_attribute *attr, char *buf)
{
	/* enough for 8 two byte hex chars plus space and new line */
	int j, len=0;
	struct mca_device *mca_dev = to_mca_device(dev);

	for(j=0; j<8; j++)
		len += sprintf(buf+len, "%02x ", mca_dev->pos[j]);
	/* change last trailing space to new line */
	buf[len-1] = '\n';
	return len;
}

static DEVICE_ATTR(id, S_IRUGO, mca_show_pos_id, NULL);
static DEVICE_ATTR(pos, S_IRUGO, mca_show_pos, NULL);

int __init mca_register_device(int bus, struct mca_device *mca_dev)
{
	struct mca_bus *mca_bus = mca_root_busses[bus];
	int rc;

	mca_dev->dev.parent = &mca_bus->dev;
	mca_dev->dev.bus = &mca_bus_type;
	sprintf (mca_dev->dev.bus_id, "%02d:%02X", bus, mca_dev->slot);
	mca_dev->dma_mask = mca_bus->default_dma_mask;
	mca_dev->dev.dma_mask = &mca_dev->dma_mask;
	mca_dev->dev.coherent_dma_mask = mca_dev->dma_mask;

	rc = device_register(&mca_dev->dev);
	if (rc)
		goto err_out;

	rc = device_create_file(&mca_dev->dev, &dev_attr_id);
	if (rc) goto err_out_devreg;
	rc = device_create_file(&mca_dev->dev, &dev_attr_pos);
	if (rc) goto err_out_id;

	return 1;

err_out_id:
	device_remove_file(&mca_dev->dev, &dev_attr_id);
err_out_devreg:
	device_unregister(&mca_dev->dev);
err_out:
	return 0;
}

/* */
struct mca_bus * __devinit mca_attach_bus(int bus)
{
	struct mca_bus *mca_bus;

	if (unlikely(mca_root_busses[bus] != NULL)) {
		/* This should never happen, but just in case */
		printk(KERN_EMERG "MCA tried to add already existing bus %d\n",
		       bus);
		dump_stack();
		return NULL;
	}

	mca_bus = kzalloc(sizeof(struct mca_bus), GFP_KERNEL);
	if (!mca_bus)
		return NULL;

	sprintf(mca_bus->dev.bus_id,"mca%d",bus);
	sprintf(mca_bus->name,"Host %s MCA Bridge", bus ? "Secondary" : "Primary");
	if (device_register(&mca_bus->dev)) {
		kfree(mca_bus);
		return NULL;
	}

	mca_root_busses[bus] = mca_bus;

	return mca_bus;
}

int __init mca_system_init (void)
{
	return bus_register(&mca_bus_type);
}

Privacy Policy