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 #include <linux/capability.h>
18
19 #include "rio.h"
20
21 /* Sysfs support */
22 #define rio_config_attr(field, format_string) \
23 static ssize_t \
24 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
25 { \
26 struct rio_dev *rdev = to_rio_dev(dev); \
27 \
28 return sprintf(buf, format_string, rdev->field); \
29 } \
30
31 rio_config_attr(did, "0x%04x\n");
32 rio_config_attr(vid, "0x%04x\n");
33 rio_config_attr(device_rev, "0x%08x\n");
34 rio_config_attr(asm_did, "0x%04x\n");
35 rio_config_attr(asm_vid, "0x%04x\n");
36 rio_config_attr(asm_rev, "0x%04x\n");
37 rio_config_attr(destid, "0x%04x\n");
38 rio_config_attr(hopcount, "0x%02x\n");
39
routes_show(struct device * dev,struct device_attribute * attr,char * buf)40 static ssize_t routes_show(struct device *dev, struct device_attribute *attr, char *buf)
41 {
42 struct rio_dev *rdev = to_rio_dev(dev);
43 char *str = buf;
44 int i;
45
46 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
47 i++) {
48 if (rdev->rswitch->route_table[i] == RIO_INVALID_ROUTE)
49 continue;
50 str +=
51 sprintf(str, "%04x %02x\n", i,
52 rdev->rswitch->route_table[i]);
53 }
54
55 return (str - buf);
56 }
57
lprev_show(struct device * dev,struct device_attribute * attr,char * buf)58 static ssize_t lprev_show(struct device *dev,
59 struct device_attribute *attr, char *buf)
60 {
61 struct rio_dev *rdev = to_rio_dev(dev);
62
63 return sprintf(buf, "%s\n",
64 (rdev->prev) ? rio_name(rdev->prev) : "root");
65 }
66
lnext_show(struct device * dev,struct device_attribute * attr,char * buf)67 static ssize_t lnext_show(struct device *dev,
68 struct device_attribute *attr, char *buf)
69 {
70 struct rio_dev *rdev = to_rio_dev(dev);
71 char *str = buf;
72 int i;
73
74 if (rdev->pef & RIO_PEF_SWITCH) {
75 for (i = 0; i < RIO_GET_TOTAL_PORTS(rdev->swpinfo); i++) {
76 if (rdev->rswitch->nextdev[i])
77 str += sprintf(str, "%s\n",
78 rio_name(rdev->rswitch->nextdev[i]));
79 else
80 str += sprintf(str, "null\n");
81 }
82 }
83
84 return str - buf;
85 }
86
87 struct device_attribute rio_dev_attrs[] = {
88 __ATTR_RO(did),
89 __ATTR_RO(vid),
90 __ATTR_RO(device_rev),
91 __ATTR_RO(asm_did),
92 __ATTR_RO(asm_vid),
93 __ATTR_RO(asm_rev),
94 __ATTR_RO(lprev),
95 __ATTR_RO(destid),
96 __ATTR_NULL,
97 };
98
99 static DEVICE_ATTR(routes, S_IRUGO, routes_show, NULL);
100 static DEVICE_ATTR(lnext, S_IRUGO, lnext_show, NULL);
101 static DEVICE_ATTR(hopcount, S_IRUGO, hopcount_show, NULL);
102
103 static ssize_t
rio_read_config(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)104 rio_read_config(struct file *filp, struct kobject *kobj,
105 struct bin_attribute *bin_attr,
106 char *buf, loff_t off, size_t count)
107 {
108 struct rio_dev *dev =
109 to_rio_dev(container_of(kobj, struct device, kobj));
110 unsigned int size = 0x100;
111 loff_t init_off = off;
112 u8 *data = (u8 *) buf;
113
114 /* Several chips lock up trying to read undefined config space */
115 if (capable(CAP_SYS_ADMIN))
116 size = RIO_MAINT_SPACE_SZ;
117
118 if (off >= size)
119 return 0;
120 if (off + count > size) {
121 size -= off;
122 count = size;
123 } else {
124 size = count;
125 }
126
127 if ((off & 1) && size) {
128 u8 val;
129 rio_read_config_8(dev, off, &val);
130 data[off - init_off] = val;
131 off++;
132 size--;
133 }
134
135 if ((off & 3) && size > 2) {
136 u16 val;
137 rio_read_config_16(dev, off, &val);
138 data[off - init_off] = (val >> 8) & 0xff;
139 data[off - init_off + 1] = val & 0xff;
140 off += 2;
141 size -= 2;
142 }
143
144 while (size > 3) {
145 u32 val;
146 rio_read_config_32(dev, off, &val);
147 data[off - init_off] = (val >> 24) & 0xff;
148 data[off - init_off + 1] = (val >> 16) & 0xff;
149 data[off - init_off + 2] = (val >> 8) & 0xff;
150 data[off - init_off + 3] = val & 0xff;
151 off += 4;
152 size -= 4;
153 }
154
155 if (size >= 2) {
156 u16 val;
157 rio_read_config_16(dev, off, &val);
158 data[off - init_off] = (val >> 8) & 0xff;
159 data[off - init_off + 1] = val & 0xff;
160 off += 2;
161 size -= 2;
162 }
163
164 if (size > 0) {
165 u8 val;
166 rio_read_config_8(dev, off, &val);
167 data[off - init_off] = val;
168 off++;
169 --size;
170 }
171
172 return count;
173 }
174
175 static ssize_t
rio_write_config(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)176 rio_write_config(struct file *filp, struct kobject *kobj,
177 struct bin_attribute *bin_attr,
178 char *buf, loff_t off, size_t count)
179 {
180 struct rio_dev *dev =
181 to_rio_dev(container_of(kobj, struct device, kobj));
182 unsigned int size = count;
183 loff_t init_off = off;
184 u8 *data = (u8 *) buf;
185
186 if (off >= RIO_MAINT_SPACE_SZ)
187 return 0;
188 if (off + count > RIO_MAINT_SPACE_SZ) {
189 size = RIO_MAINT_SPACE_SZ - off;
190 count = size;
191 }
192
193 if ((off & 1) && size) {
194 rio_write_config_8(dev, off, data[off - init_off]);
195 off++;
196 size--;
197 }
198
199 if ((off & 3) && (size > 2)) {
200 u16 val = data[off - init_off + 1];
201 val |= (u16) data[off - init_off] << 8;
202 rio_write_config_16(dev, off, val);
203 off += 2;
204 size -= 2;
205 }
206
207 while (size > 3) {
208 u32 val = data[off - init_off + 3];
209 val |= (u32) data[off - init_off + 2] << 8;
210 val |= (u32) data[off - init_off + 1] << 16;
211 val |= (u32) data[off - init_off] << 24;
212 rio_write_config_32(dev, off, val);
213 off += 4;
214 size -= 4;
215 }
216
217 if (size >= 2) {
218 u16 val = data[off - init_off + 1];
219 val |= (u16) data[off - init_off] << 8;
220 rio_write_config_16(dev, off, val);
221 off += 2;
222 size -= 2;
223 }
224
225 if (size) {
226 rio_write_config_8(dev, off, data[off - init_off]);
227 off++;
228 --size;
229 }
230
231 return count;
232 }
233
234 static struct bin_attribute rio_config_attr = {
235 .attr = {
236 .name = "config",
237 .mode = S_IRUGO | S_IWUSR,
238 },
239 .size = RIO_MAINT_SPACE_SZ,
240 .read = rio_read_config,
241 .write = rio_write_config,
242 };
243
244 /**
245 * rio_create_sysfs_dev_files - create RIO specific sysfs files
246 * @rdev: device whose entries should be created
247 *
248 * Create files when @rdev is added to sysfs.
249 */
rio_create_sysfs_dev_files(struct rio_dev * rdev)250 int rio_create_sysfs_dev_files(struct rio_dev *rdev)
251 {
252 int err = 0;
253
254 err = device_create_bin_file(&rdev->dev, &rio_config_attr);
255
256 if (!err && (rdev->pef & RIO_PEF_SWITCH)) {
257 err |= device_create_file(&rdev->dev, &dev_attr_routes);
258 err |= device_create_file(&rdev->dev, &dev_attr_lnext);
259 err |= device_create_file(&rdev->dev, &dev_attr_hopcount);
260 if (!err && rdev->rswitch->sw_sysfs)
261 err = rdev->rswitch->sw_sysfs(rdev, RIO_SW_SYSFS_CREATE);
262 }
263
264 if (err)
265 pr_warning("RIO: Failed to create attribute file(s) for %s\n",
266 rio_name(rdev));
267
268 return err;
269 }
270
271 /**
272 * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
273 * @rdev: device whose entries we should free
274 *
275 * Cleanup when @rdev is removed from sysfs.
276 */
rio_remove_sysfs_dev_files(struct rio_dev * rdev)277 void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
278 {
279 device_remove_bin_file(&rdev->dev, &rio_config_attr);
280 if (rdev->pef & RIO_PEF_SWITCH) {
281 device_remove_file(&rdev->dev, &dev_attr_routes);
282 device_remove_file(&rdev->dev, &dev_attr_lnext);
283 device_remove_file(&rdev->dev, &dev_attr_hopcount);
284 if (rdev->rswitch->sw_sysfs)
285 rdev->rswitch->sw_sysfs(rdev, RIO_SW_SYSFS_REMOVE);
286 }
287 }
288