1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * RapidIO sysfs attributes and support
4 *
5 * Copyright 2005 MontaVista Software, Inc.
6 * Matt Porter <mporter@kernel.crashing.org>
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/rio.h>
11 #include <linux/rio_drv.h>
12 #include <linux/stat.h>
13 #include <linux/capability.h>
14
15 #include "rio.h"
16
17 /* Sysfs support */
18 #define rio_config_attr(field, format_string) \
19 static ssize_t \
20 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
21 { \
22 struct rio_dev *rdev = to_rio_dev(dev); \
23 \
24 return sprintf(buf, format_string, rdev->field); \
25 } \
26 static DEVICE_ATTR_RO(field);
27
28 rio_config_attr(did, "0x%04x\n");
29 rio_config_attr(vid, "0x%04x\n");
30 rio_config_attr(device_rev, "0x%08x\n");
31 rio_config_attr(asm_did, "0x%04x\n");
32 rio_config_attr(asm_vid, "0x%04x\n");
33 rio_config_attr(asm_rev, "0x%04x\n");
34 rio_config_attr(destid, "0x%04x\n");
35 rio_config_attr(hopcount, "0x%02x\n");
36
routes_show(struct device * dev,struct device_attribute * attr,char * buf)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 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
44 i++) {
45 if (rdev->rswitch->route_table[i] == RIO_INVALID_ROUTE)
46 continue;
47 str +=
48 sprintf(str, "%04x %02x\n", i,
49 rdev->rswitch->route_table[i]);
50 }
51
52 return (str - buf);
53 }
54 static DEVICE_ATTR_RO(routes);
55
lprev_show(struct device * dev,struct device_attribute * attr,char * buf)56 static ssize_t lprev_show(struct device *dev,
57 struct device_attribute *attr, char *buf)
58 {
59 struct rio_dev *rdev = to_rio_dev(dev);
60
61 return sprintf(buf, "%s\n",
62 (rdev->prev) ? rio_name(rdev->prev) : "root");
63 }
64 static DEVICE_ATTR_RO(lprev);
65
lnext_show(struct device * dev,struct device_attribute * attr,char * buf)66 static ssize_t lnext_show(struct device *dev,
67 struct device_attribute *attr, char *buf)
68 {
69 struct rio_dev *rdev = to_rio_dev(dev);
70 char *str = buf;
71 int i;
72
73 if (rdev->pef & RIO_PEF_SWITCH) {
74 for (i = 0; i < RIO_GET_TOTAL_PORTS(rdev->swpinfo); i++) {
75 if (rdev->rswitch->nextdev[i])
76 str += sprintf(str, "%s\n",
77 rio_name(rdev->rswitch->nextdev[i]));
78 else
79 str += sprintf(str, "null\n");
80 }
81 }
82
83 return str - buf;
84 }
85 static DEVICE_ATTR_RO(lnext);
86
modalias_show(struct device * dev,struct device_attribute * attr,char * buf)87 static ssize_t modalias_show(struct device *dev,
88 struct device_attribute *attr, char *buf)
89 {
90 struct rio_dev *rdev = to_rio_dev(dev);
91
92 return sprintf(buf, "rapidio:v%04Xd%04Xav%04Xad%04X\n",
93 rdev->vid, rdev->did, rdev->asm_vid, rdev->asm_did);
94 }
95 static DEVICE_ATTR_RO(modalias);
96
97 static struct attribute *rio_dev_attrs[] = {
98 &dev_attr_did.attr,
99 &dev_attr_vid.attr,
100 &dev_attr_device_rev.attr,
101 &dev_attr_asm_did.attr,
102 &dev_attr_asm_vid.attr,
103 &dev_attr_asm_rev.attr,
104 &dev_attr_lprev.attr,
105 &dev_attr_destid.attr,
106 &dev_attr_modalias.attr,
107
108 /* Switch-only attributes */
109 &dev_attr_routes.attr,
110 &dev_attr_lnext.attr,
111 &dev_attr_hopcount.attr,
112 NULL,
113 };
114
115 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)116 rio_read_config(struct file *filp, struct kobject *kobj,
117 struct bin_attribute *bin_attr,
118 char *buf, loff_t off, size_t count)
119 {
120 struct rio_dev *dev = to_rio_dev(kobj_to_dev(kobj));
121 unsigned int size = 0x100;
122 loff_t init_off = off;
123 u8 *data = (u8 *) buf;
124
125 /* Several chips lock up trying to read undefined config space */
126 if (capable(CAP_SYS_ADMIN))
127 size = RIO_MAINT_SPACE_SZ;
128
129 if (off >= size)
130 return 0;
131 if (off + count > size) {
132 size -= off;
133 count = size;
134 } else {
135 size = count;
136 }
137
138 if ((off & 1) && size) {
139 u8 val;
140 rio_read_config_8(dev, off, &val);
141 data[off - init_off] = val;
142 off++;
143 size--;
144 }
145
146 if ((off & 3) && size > 2) {
147 u16 val;
148 rio_read_config_16(dev, off, &val);
149 data[off - init_off] = (val >> 8) & 0xff;
150 data[off - init_off + 1] = val & 0xff;
151 off += 2;
152 size -= 2;
153 }
154
155 while (size > 3) {
156 u32 val;
157 rio_read_config_32(dev, off, &val);
158 data[off - init_off] = (val >> 24) & 0xff;
159 data[off - init_off + 1] = (val >> 16) & 0xff;
160 data[off - init_off + 2] = (val >> 8) & 0xff;
161 data[off - init_off + 3] = val & 0xff;
162 off += 4;
163 size -= 4;
164 }
165
166 if (size >= 2) {
167 u16 val;
168 rio_read_config_16(dev, off, &val);
169 data[off - init_off] = (val >> 8) & 0xff;
170 data[off - init_off + 1] = val & 0xff;
171 off += 2;
172 size -= 2;
173 }
174
175 if (size > 0) {
176 u8 val;
177 rio_read_config_8(dev, off, &val);
178 data[off - init_off] = val;
179 off++;
180 --size;
181 }
182
183 return count;
184 }
185
186 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)187 rio_write_config(struct file *filp, struct kobject *kobj,
188 struct bin_attribute *bin_attr,
189 char *buf, loff_t off, size_t count)
190 {
191 struct rio_dev *dev = to_rio_dev(kobj_to_dev(kobj));
192 unsigned int size = count;
193 loff_t init_off = off;
194 u8 *data = (u8 *) buf;
195
196 if (off >= RIO_MAINT_SPACE_SZ)
197 return 0;
198 if (off + count > RIO_MAINT_SPACE_SZ) {
199 size = RIO_MAINT_SPACE_SZ - off;
200 count = size;
201 }
202
203 if ((off & 1) && size) {
204 rio_write_config_8(dev, off, data[off - init_off]);
205 off++;
206 size--;
207 }
208
209 if ((off & 3) && (size > 2)) {
210 u16 val = data[off - init_off + 1];
211 val |= (u16) data[off - init_off] << 8;
212 rio_write_config_16(dev, off, val);
213 off += 2;
214 size -= 2;
215 }
216
217 while (size > 3) {
218 u32 val = data[off - init_off + 3];
219 val |= (u32) data[off - init_off + 2] << 8;
220 val |= (u32) data[off - init_off + 1] << 16;
221 val |= (u32) data[off - init_off] << 24;
222 rio_write_config_32(dev, off, val);
223 off += 4;
224 size -= 4;
225 }
226
227 if (size >= 2) {
228 u16 val = data[off - init_off + 1];
229 val |= (u16) data[off - init_off] << 8;
230 rio_write_config_16(dev, off, val);
231 off += 2;
232 size -= 2;
233 }
234
235 if (size) {
236 rio_write_config_8(dev, off, data[off - init_off]);
237 off++;
238 --size;
239 }
240
241 return count;
242 }
243
244 static struct bin_attribute rio_config_attr = {
245 .attr = {
246 .name = "config",
247 .mode = S_IRUGO | S_IWUSR,
248 },
249 .size = RIO_MAINT_SPACE_SZ,
250 .read = rio_read_config,
251 .write = rio_write_config,
252 };
253
254 static struct bin_attribute *rio_dev_bin_attrs[] = {
255 &rio_config_attr,
256 NULL,
257 };
258
rio_dev_is_attr_visible(struct kobject * kobj,struct attribute * attr,int n)259 static umode_t rio_dev_is_attr_visible(struct kobject *kobj,
260 struct attribute *attr, int n)
261 {
262 struct rio_dev *rdev = to_rio_dev(kobj_to_dev(kobj));
263 umode_t mode = attr->mode;
264
265 if (!(rdev->pef & RIO_PEF_SWITCH) &&
266 (attr == &dev_attr_routes.attr ||
267 attr == &dev_attr_lnext.attr ||
268 attr == &dev_attr_hopcount.attr)) {
269 /*
270 * Hide switch-specific attributes for a non-switch device.
271 */
272 mode = 0;
273 }
274
275 return mode;
276 }
277
278 static const struct attribute_group rio_dev_group = {
279 .attrs = rio_dev_attrs,
280 .is_visible = rio_dev_is_attr_visible,
281 .bin_attrs = rio_dev_bin_attrs,
282 };
283
284 const struct attribute_group *rio_dev_groups[] = {
285 &rio_dev_group,
286 NULL,
287 };
288
scan_store(struct bus_type * bus,const char * buf,size_t count)289 static ssize_t scan_store(struct bus_type *bus, const char *buf, size_t count)
290 {
291 long val;
292 int rc;
293
294 if (kstrtol(buf, 0, &val) < 0)
295 return -EINVAL;
296
297 if (val == RIO_MPORT_ANY) {
298 rc = rio_init_mports();
299 goto exit;
300 }
301
302 if (val < 0 || val >= RIO_MAX_MPORTS)
303 return -EINVAL;
304
305 rc = rio_mport_scan((int)val);
306 exit:
307 if (!rc)
308 rc = count;
309
310 return rc;
311 }
312 static BUS_ATTR_WO(scan);
313
314 static struct attribute *rio_bus_attrs[] = {
315 &bus_attr_scan.attr,
316 NULL,
317 };
318
319 static const struct attribute_group rio_bus_group = {
320 .attrs = rio_bus_attrs,
321 };
322
323 const struct attribute_group *rio_bus_groups[] = {
324 &rio_bus_group,
325 NULL,
326 };
327
328 static ssize_t
port_destid_show(struct device * dev,struct device_attribute * attr,char * buf)329 port_destid_show(struct device *dev, struct device_attribute *attr,
330 char *buf)
331 {
332 struct rio_mport *mport = to_rio_mport(dev);
333
334 if (mport)
335 return sprintf(buf, "0x%04x\n", mport->host_deviceid);
336 else
337 return -ENODEV;
338 }
339 static DEVICE_ATTR_RO(port_destid);
340
sys_size_show(struct device * dev,struct device_attribute * attr,char * buf)341 static ssize_t sys_size_show(struct device *dev, struct device_attribute *attr,
342 char *buf)
343 {
344 struct rio_mport *mport = to_rio_mport(dev);
345
346 if (mport)
347 return sprintf(buf, "%u\n", mport->sys_size);
348 else
349 return -ENODEV;
350 }
351 static DEVICE_ATTR_RO(sys_size);
352
353 static struct attribute *rio_mport_attrs[] = {
354 &dev_attr_port_destid.attr,
355 &dev_attr_sys_size.attr,
356 NULL,
357 };
358
359 static const struct attribute_group rio_mport_group = {
360 .attrs = rio_mport_attrs,
361 };
362
363 const struct attribute_group *rio_mport_groups[] = {
364 &rio_mport_group,
365 NULL,
366 };
367