cfq: fix IOPRIO_CLASS_IDLE delays
[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/kernel.h>
14 #include <linux/rio.h>
15 #include <linux/rio_drv.h>
16 #include <linux/stat.h>
17
18 #include "rio.h"
19
20 /* Sysfs support */
21 #define rio_config_attr(field, format_string)                                   \
22 static ssize_t                                                          \
23 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                      \
24 {                                                                       \
25         struct rio_dev *rdev = to_rio_dev(dev);                         \
26                                                                         \
27         return sprintf(buf, format_string, rdev->field);                \
28 }                                                                       \
29
30 rio_config_attr(did, "0x%04x\n");
31 rio_config_attr(vid, "0x%04x\n");
32 rio_config_attr(device_rev, "0x%08x\n");
33 rio_config_attr(asm_did, "0x%04x\n");
34 rio_config_attr(asm_vid, "0x%04x\n");
35 rio_config_attr(asm_rev, "0x%04x\n");
36
37 static ssize_t routes_show(struct device *dev, struct device_attribute *attr, char *buf)
38 {
39         struct rio_dev *rdev = to_rio_dev(dev);
40         char *str = buf;
41         int i;
42
43         if (!rdev->rswitch)
44                 goto out;
45
46         for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) {
47                 if (rdev->rswitch->route_table[i] == RIO_INVALID_ROUTE)
48                         continue;
49                 str +=
50                     sprintf(str, "%04x %02x\n", i,
51                             rdev->rswitch->route_table[i]);
52         }
53
54       out:
55         return (str - buf);
56 }
57
58 struct device_attribute rio_dev_attrs[] = {
59         __ATTR_RO(did),
60         __ATTR_RO(vid),
61         __ATTR_RO(device_rev),
62         __ATTR_RO(asm_did),
63         __ATTR_RO(asm_vid),
64         __ATTR_RO(asm_rev),
65         __ATTR_RO(routes),
66         __ATTR_NULL,
67 };
68
69 static ssize_t
70 rio_read_config(struct kobject *kobj, struct bin_attribute *bin_attr,
71                 char *buf, loff_t off, size_t count)
72 {
73         struct rio_dev *dev =
74             to_rio_dev(container_of(kobj, struct device, kobj));
75         unsigned int size = 0x100;
76         loff_t init_off = off;
77         u8 *data = (u8 *) buf;
78
79         /* Several chips lock up trying to read undefined config space */
80         if (capable(CAP_SYS_ADMIN))
81                 size = 0x200000;
82
83         if (off > size)
84                 return 0;
85         if (off + count > size) {
86                 size -= off;
87                 count = size;
88         } else {
89                 size = count;
90         }
91
92         if ((off & 1) && size) {
93                 u8 val;
94                 rio_read_config_8(dev, off, &val);
95                 data[off - init_off] = val;
96                 off++;
97                 size--;
98         }
99
100         if ((off & 3) && size > 2) {
101                 u16 val;
102                 rio_read_config_16(dev, off, &val);
103                 data[off - init_off] = (val >> 8) & 0xff;
104                 data[off - init_off + 1] = val & 0xff;
105                 off += 2;
106                 size -= 2;
107         }
108
109         while (size > 3) {
110                 u32 val;
111                 rio_read_config_32(dev, off, &val);
112                 data[off - init_off] = (val >> 24) & 0xff;
113                 data[off - init_off + 1] = (val >> 16) & 0xff;
114                 data[off - init_off + 2] = (val >> 8) & 0xff;
115                 data[off - init_off + 3] = val & 0xff;
116                 off += 4;
117                 size -= 4;
118         }
119
120         if (size >= 2) {
121                 u16 val;
122                 rio_read_config_16(dev, off, &val);
123                 data[off - init_off] = (val >> 8) & 0xff;
124                 data[off - init_off + 1] = val & 0xff;
125                 off += 2;
126                 size -= 2;
127         }
128
129         if (size > 0) {
130                 u8 val;
131                 rio_read_config_8(dev, off, &val);
132                 data[off - init_off] = val;
133                 off++;
134                 --size;
135         }
136
137         return count;
138 }
139
140 static ssize_t
141 rio_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
142                  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                  },
203         .size = 0x200000,
204         .read = rio_read_config,
205         .write = rio_write_config,
206 };
207
208 /**
209  * rio_create_sysfs_dev_files - create RIO specific sysfs files
210  * @rdev: device whose entries should be created
211  *
212  * Create files when @rdev is added to sysfs.
213  */
214 int rio_create_sysfs_dev_files(struct rio_dev *rdev)
215 {
216         sysfs_create_bin_file(&rdev->dev.kobj, &rio_config_attr);
217
218         return 0;
219 }
220
221 /**
222  * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
223  * @rdev: device whose entries we should free
224  *
225  * Cleanup when @rdev is removed from sysfs.
226  */
227 void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
228 {
229         sysfs_remove_bin_file(&rdev->dev.kobj, &rio_config_attr);
230 }