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[linux-2.6] / drivers / rapidio / rio-sysfs.c
1 /*
2  * RapidIO sysfs attributes and support
3  *
4  * Copyright 2005 MontaVista Software, Inc.
5  * Matt Porter <mporter@kernel.crashing.org>
6  *
7  * This program is free software; you can redistribute  it and/or modify it
8  * under  the terms of  the GNU General  Public License as published by the
9  * Free Software Foundation;  either version 2 of the  License, or (at your
10  * option) any later version.
11  */
12
13 #include <linux/config.h>
14 #include <linux/kernel.h>
15 #include <linux/rio.h>
16 #include <linux/rio_drv.h>
17 #include <linux/stat.h>
18 #include <linux/sched.h>        /* for capable() */
19
20 #include "rio.h"
21
22 /* Sysfs support */
23 #define rio_config_attr(field, format_string)                                   \
24 static ssize_t                                                          \
25 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                      \
26 {                                                                       \
27         struct rio_dev *rdev = to_rio_dev(dev);                         \
28                                                                         \
29         return sprintf(buf, format_string, rdev->field);                \
30 }                                                                       \
31
32 rio_config_attr(did, "0x%04x\n");
33 rio_config_attr(vid, "0x%04x\n");
34 rio_config_attr(device_rev, "0x%08x\n");
35 rio_config_attr(asm_did, "0x%04x\n");
36 rio_config_attr(asm_vid, "0x%04x\n");
37 rio_config_attr(asm_rev, "0x%04x\n");
38
39 static ssize_t routes_show(struct device *dev, struct device_attribute *attr, char *buf)
40 {
41         struct rio_dev *rdev = to_rio_dev(dev);
42         char *str = buf;
43         int i;
44
45         if (!rdev->rswitch)
46                 goto out;
47
48         for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) {
49                 if (rdev->rswitch->route_table[i] == RIO_INVALID_ROUTE)
50                         continue;
51                 str +=
52                     sprintf(str, "%04x %02x\n", i,
53                             rdev->rswitch->route_table[i]);
54         }
55
56       out:
57         return (str - buf);
58 }
59
60 struct device_attribute rio_dev_attrs[] = {
61         __ATTR_RO(did),
62         __ATTR_RO(vid),
63         __ATTR_RO(device_rev),
64         __ATTR_RO(asm_did),
65         __ATTR_RO(asm_vid),
66         __ATTR_RO(asm_rev),
67         __ATTR_RO(routes),
68         __ATTR_NULL,
69 };
70
71 static ssize_t
72 rio_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
73 {
74         struct rio_dev *dev =
75             to_rio_dev(container_of(kobj, struct device, kobj));
76         unsigned int size = 0x100;
77         loff_t init_off = off;
78         u8 *data = (u8 *) buf;
79
80         /* Several chips lock up trying to read undefined config space */
81         if (capable(CAP_SYS_ADMIN))
82                 size = 0x200000;
83
84         if (off > size)
85                 return 0;
86         if (off + count > size) {
87                 size -= off;
88                 count = size;
89         } else {
90                 size = count;
91         }
92
93         if ((off & 1) && size) {
94                 u8 val;
95                 rio_read_config_8(dev, off, &val);
96                 data[off - init_off] = val;
97                 off++;
98                 size--;
99         }
100
101         if ((off & 3) && size > 2) {
102                 u16 val;
103                 rio_read_config_16(dev, off, &val);
104                 data[off - init_off] = (val >> 8) & 0xff;
105                 data[off - init_off + 1] = val & 0xff;
106                 off += 2;
107                 size -= 2;
108         }
109
110         while (size > 3) {
111                 u32 val;
112                 rio_read_config_32(dev, off, &val);
113                 data[off - init_off] = (val >> 24) & 0xff;
114                 data[off - init_off + 1] = (val >> 16) & 0xff;
115                 data[off - init_off + 2] = (val >> 8) & 0xff;
116                 data[off - init_off + 3] = val & 0xff;
117                 off += 4;
118                 size -= 4;
119         }
120
121         if (size >= 2) {
122                 u16 val;
123                 rio_read_config_16(dev, off, &val);
124                 data[off - init_off] = (val >> 8) & 0xff;
125                 data[off - init_off + 1] = val & 0xff;
126                 off += 2;
127                 size -= 2;
128         }
129
130         if (size > 0) {
131                 u8 val;
132                 rio_read_config_8(dev, off, &val);
133                 data[off - init_off] = val;
134                 off++;
135                 --size;
136         }
137
138         return count;
139 }
140
141 static ssize_t
142 rio_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
143 {
144         struct rio_dev *dev =
145             to_rio_dev(container_of(kobj, struct device, kobj));
146         unsigned int size = count;
147         loff_t init_off = off;
148         u8 *data = (u8 *) buf;
149
150         if (off > 0x200000)
151                 return 0;
152         if (off + count > 0x200000) {
153                 size = 0x200000 - off;
154                 count = size;
155         }
156
157         if ((off & 1) && size) {
158                 rio_write_config_8(dev, off, data[off - init_off]);
159                 off++;
160                 size--;
161         }
162
163         if ((off & 3) && (size > 2)) {
164                 u16 val = data[off - init_off + 1];
165                 val |= (u16) data[off - init_off] << 8;
166                 rio_write_config_16(dev, off, val);
167                 off += 2;
168                 size -= 2;
169         }
170
171         while (size > 3) {
172                 u32 val = data[off - init_off + 3];
173                 val |= (u32) data[off - init_off + 2] << 8;
174                 val |= (u32) data[off - init_off + 1] << 16;
175                 val |= (u32) data[off - init_off] << 24;
176                 rio_write_config_32(dev, off, val);
177                 off += 4;
178                 size -= 4;
179         }
180
181         if (size >= 2) {
182                 u16 val = data[off - init_off + 1];
183                 val |= (u16) data[off - init_off] << 8;
184                 rio_write_config_16(dev, off, val);
185                 off += 2;
186                 size -= 2;
187         }
188
189         if (size) {
190                 rio_write_config_8(dev, off, data[off - init_off]);
191                 off++;
192                 --size;
193         }
194
195         return count;
196 }
197
198 static struct bin_attribute rio_config_attr = {
199         .attr = {
200                  .name = "config",
201                  .mode = S_IRUGO | S_IWUSR,
202                  .owner = THIS_MODULE,
203                  },
204         .size = 0x200000,
205         .read = rio_read_config,
206         .write = rio_write_config,
207 };
208
209 /**
210  * rio_create_sysfs_dev_files - create RIO specific sysfs files
211  * @rdev: device whose entries should be created
212  *
213  * Create files when @rdev is added to sysfs.
214  */
215 int rio_create_sysfs_dev_files(struct rio_dev *rdev)
216 {
217         sysfs_create_bin_file(&rdev->dev.kobj, &rio_config_attr);
218
219         return 0;
220 }
221
222 /**
223  * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
224  * @rdev: device whose entries we should free
225  *
226  * Cleanup when @rdev is removed from sysfs.
227  */
228 void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
229 {
230         sysfs_remove_bin_file(&rdev->dev.kobj, &rio_config_attr);
231 }