Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Industry-pack bus support functions.
4 *
5 * Copyright (C) 2011-2012 CERN (www.cern.ch)
6 * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
7 */
8
9#include <linux/module.h>
10#include <linux/slab.h>
11#include <linux/idr.h>
12#include <linux/io.h>
13#include <linux/ipack.h>
14
15#define to_ipack_dev(device) container_of(device, struct ipack_device, dev)
16#define to_ipack_driver(drv) container_of(drv, struct ipack_driver, driver)
17
18static DEFINE_IDA(ipack_ida);
19
20static void ipack_device_release(struct device *dev)
21{
22 struct ipack_device *device = to_ipack_dev(dev);
23 kfree(device->id);
24 device->release(device);
25}
26
27static inline const struct ipack_device_id *
28ipack_match_one_device(const struct ipack_device_id *id,
29 const struct ipack_device *device)
30{
31 if ((id->format == IPACK_ANY_FORMAT ||
32 id->format == device->id_format) &&
33 (id->vendor == IPACK_ANY_ID || id->vendor == device->id_vendor) &&
34 (id->device == IPACK_ANY_ID || id->device == device->id_device))
35 return id;
36 return NULL;
37}
38
39static const struct ipack_device_id *
40ipack_match_id(const struct ipack_device_id *ids, struct ipack_device *idev)
41{
42 if (ids) {
43 while (ids->vendor || ids->device) {
44 if (ipack_match_one_device(ids, idev))
45 return ids;
46 ids++;
47 }
48 }
49 return NULL;
50}
51
52static int ipack_bus_match(struct device *dev, struct device_driver *drv)
53{
54 struct ipack_device *idev = to_ipack_dev(dev);
55 struct ipack_driver *idrv = to_ipack_driver(drv);
56 const struct ipack_device_id *found_id;
57
58 found_id = ipack_match_id(idrv->id_table, idev);
59 return found_id ? 1 : 0;
60}
61
62static int ipack_bus_probe(struct device *device)
63{
64 struct ipack_device *dev = to_ipack_dev(device);
65 struct ipack_driver *drv = to_ipack_driver(device->driver);
66
67 if (!drv->ops->probe)
68 return -EINVAL;
69
70 return drv->ops->probe(dev);
71}
72
73static int ipack_bus_remove(struct device *device)
74{
75 struct ipack_device *dev = to_ipack_dev(device);
76 struct ipack_driver *drv = to_ipack_driver(device->driver);
77
78 if (!drv->ops->remove)
79 return -EINVAL;
80
81 drv->ops->remove(dev);
82 return 0;
83}
84
85static int ipack_uevent(struct device *dev, struct kobj_uevent_env *env)
86{
87 struct ipack_device *idev;
88
89 if (!dev)
90 return -ENODEV;
91
92 idev = to_ipack_dev(dev);
93
94 if (add_uevent_var(env,
95 "MODALIAS=ipack:f%02Xv%08Xd%08X", idev->id_format,
96 idev->id_vendor, idev->id_device))
97 return -ENOMEM;
98
99 return 0;
100}
101
102#define ipack_device_attr(field, format_string) \
103static ssize_t \
104field##_show(struct device *dev, struct device_attribute *attr, \
105 char *buf) \
106{ \
107 struct ipack_device *idev = to_ipack_dev(dev); \
108 return sprintf(buf, format_string, idev->field); \
109}
110
111static ssize_t id_show(struct device *dev,
112 struct device_attribute *attr, char *buf)
113{
114 unsigned int i, c, l, s;
115 struct ipack_device *idev = to_ipack_dev(dev);
116
117
118 switch (idev->id_format) {
119 case IPACK_ID_VERSION_1:
120 l = 0x7; s = 1; break;
121 case IPACK_ID_VERSION_2:
122 l = 0xf; s = 2; break;
123 default:
124 return -EIO;
125 }
126 c = 0;
127 for (i = 0; i < idev->id_avail; i++) {
128 if (i > 0) {
129 if ((i & l) == 0)
130 buf[c++] = '\n';
131 else if ((i & s) == 0)
132 buf[c++] = ' ';
133 }
134 sprintf(&buf[c], "%02x", idev->id[i]);
135 c += 2;
136 }
137 buf[c++] = '\n';
138 return c;
139}
140
141static ssize_t
142id_vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
143{
144 struct ipack_device *idev = to_ipack_dev(dev);
145 switch (idev->id_format) {
146 case IPACK_ID_VERSION_1:
147 return sprintf(buf, "0x%02x\n", idev->id_vendor);
148 case IPACK_ID_VERSION_2:
149 return sprintf(buf, "0x%06x\n", idev->id_vendor);
150 default:
151 return -EIO;
152 }
153}
154
155static ssize_t
156id_device_show(struct device *dev, struct device_attribute *attr, char *buf)
157{
158 struct ipack_device *idev = to_ipack_dev(dev);
159 switch (idev->id_format) {
160 case IPACK_ID_VERSION_1:
161 return sprintf(buf, "0x%02x\n", idev->id_device);
162 case IPACK_ID_VERSION_2:
163 return sprintf(buf, "0x%04x\n", idev->id_device);
164 default:
165 return -EIO;
166 }
167}
168
169static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
170 char *buf)
171{
172 struct ipack_device *idev = to_ipack_dev(dev);
173
174 return sprintf(buf, "ipac:f%02Xv%08Xd%08X", idev->id_format,
175 idev->id_vendor, idev->id_device);
176}
177
178ipack_device_attr(id_format, "0x%hhx\n");
179
180static DEVICE_ATTR_RO(id);
181static DEVICE_ATTR_RO(id_device);
182static DEVICE_ATTR_RO(id_format);
183static DEVICE_ATTR_RO(id_vendor);
184static DEVICE_ATTR_RO(modalias);
185
186static struct attribute *ipack_attrs[] = {
187 &dev_attr_id.attr,
188 &dev_attr_id_device.attr,
189 &dev_attr_id_format.attr,
190 &dev_attr_id_vendor.attr,
191 &dev_attr_modalias.attr,
192 NULL,
193};
194ATTRIBUTE_GROUPS(ipack);
195
196static struct bus_type ipack_bus_type = {
197 .name = "ipack",
198 .probe = ipack_bus_probe,
199 .match = ipack_bus_match,
200 .remove = ipack_bus_remove,
201 .dev_groups = ipack_groups,
202 .uevent = ipack_uevent,
203};
204
205struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots,
206 const struct ipack_bus_ops *ops,
207 struct module *owner)
208{
209 int bus_nr;
210 struct ipack_bus_device *bus;
211
212 bus = kzalloc(sizeof(*bus), GFP_KERNEL);
213 if (!bus)
214 return NULL;
215
216 bus_nr = ida_simple_get(&ipack_ida, 0, 0, GFP_KERNEL);
217 if (bus_nr < 0) {
218 kfree(bus);
219 return NULL;
220 }
221
222 bus->bus_nr = bus_nr;
223 bus->parent = parent;
224 bus->slots = slots;
225 bus->ops = ops;
226 bus->owner = owner;
227 return bus;
228}
229EXPORT_SYMBOL_GPL(ipack_bus_register);
230
231static int ipack_unregister_bus_member(struct device *dev, void *data)
232{
233 struct ipack_device *idev = to_ipack_dev(dev);
234 struct ipack_bus_device *bus = data;
235
236 if (idev->bus == bus)
237 ipack_device_del(idev);
238
239 return 1;
240}
241
242int ipack_bus_unregister(struct ipack_bus_device *bus)
243{
244 bus_for_each_dev(&ipack_bus_type, NULL, bus,
245 ipack_unregister_bus_member);
246 ida_simple_remove(&ipack_ida, bus->bus_nr);
247 kfree(bus);
248 return 0;
249}
250EXPORT_SYMBOL_GPL(ipack_bus_unregister);
251
252int ipack_driver_register(struct ipack_driver *edrv, struct module *owner,
253 const char *name)
254{
255 edrv->driver.owner = owner;
256 edrv->driver.name = name;
257 edrv->driver.bus = &ipack_bus_type;
258 return driver_register(&edrv->driver);
259}
260EXPORT_SYMBOL_GPL(ipack_driver_register);
261
262void ipack_driver_unregister(struct ipack_driver *edrv)
263{
264 driver_unregister(&edrv->driver);
265}
266EXPORT_SYMBOL_GPL(ipack_driver_unregister);
267
268static u16 ipack_crc_byte(u16 crc, u8 c)
269{
270 int i;
271
272 crc ^= c << 8;
273 for (i = 0; i < 8; i++)
274 crc = (crc << 1) ^ ((crc & 0x8000) ? 0x1021 : 0);
275 return crc;
276}
277
278/*
279 * The algorithm in lib/crc-ccitt.c does not seem to apply since it uses the
280 * opposite bit ordering.
281 */
282static u8 ipack_calc_crc1(struct ipack_device *dev)
283{
284 u8 c;
285 u16 crc;
286 unsigned int i;
287
288 crc = 0xffff;
289 for (i = 0; i < dev->id_avail; i++) {
290 c = (i != 11) ? dev->id[i] : 0;
291 crc = ipack_crc_byte(crc, c);
292 }
293 crc = ~crc;
294 return crc & 0xff;
295}
296
297static u16 ipack_calc_crc2(struct ipack_device *dev)
298{
299 u8 c;
300 u16 crc;
301 unsigned int i;
302
303 crc = 0xffff;
304 for (i = 0; i < dev->id_avail; i++) {
305 c = ((i != 0x18) && (i != 0x19)) ? dev->id[i] : 0;
306 crc = ipack_crc_byte(crc, c);
307 }
308 crc = ~crc;
309 return crc;
310}
311
312static void ipack_parse_id1(struct ipack_device *dev)
313{
314 u8 *id = dev->id;
315 u8 crc;
316
317 dev->id_vendor = id[4];
318 dev->id_device = id[5];
319 dev->speed_8mhz = 1;
320 dev->speed_32mhz = (id[7] == 'H');
321 crc = ipack_calc_crc1(dev);
322 dev->id_crc_correct = (crc == id[11]);
323 if (!dev->id_crc_correct) {
324 dev_warn(&dev->dev, "ID CRC invalid found 0x%x, expected 0x%x.\n",
325 id[11], crc);
326 }
327}
328
329static void ipack_parse_id2(struct ipack_device *dev)
330{
331 __be16 *id = (__be16 *) dev->id;
332 u16 flags, crc;
333
334 dev->id_vendor = ((be16_to_cpu(id[3]) & 0xff) << 16)
335 + be16_to_cpu(id[4]);
336 dev->id_device = be16_to_cpu(id[5]);
337 flags = be16_to_cpu(id[10]);
338 dev->speed_8mhz = !!(flags & 2);
339 dev->speed_32mhz = !!(flags & 4);
340 crc = ipack_calc_crc2(dev);
341 dev->id_crc_correct = (crc == be16_to_cpu(id[12]));
342 if (!dev->id_crc_correct) {
343 dev_warn(&dev->dev, "ID CRC invalid found 0x%x, expected 0x%x.\n",
344 id[11], crc);
345 }
346}
347
348static int ipack_device_read_id(struct ipack_device *dev)
349{
350 u8 __iomem *idmem;
351 int i;
352 int ret = 0;
353
354 idmem = ioremap(dev->region[IPACK_ID_SPACE].start,
355 dev->region[IPACK_ID_SPACE].size);
356 if (!idmem) {
357 dev_err(&dev->dev, "error mapping memory\n");
358 return -ENOMEM;
359 }
360
361 /* Determine ID PROM Data Format. If we find the ids "IPAC" or "IPAH"
362 * we are dealing with a IndustryPack format 1 device. If we detect
363 * "VITA4 " (16 bit big endian formatted) we are dealing with a
364 * IndustryPack format 2 device */
365 if ((ioread8(idmem + 1) == 'I') &&
366 (ioread8(idmem + 3) == 'P') &&
367 (ioread8(idmem + 5) == 'A') &&
368 ((ioread8(idmem + 7) == 'C') ||
369 (ioread8(idmem + 7) == 'H'))) {
370 dev->id_format = IPACK_ID_VERSION_1;
371 dev->id_avail = ioread8(idmem + 0x15);
372 if ((dev->id_avail < 0x0c) || (dev->id_avail > 0x40)) {
373 dev_warn(&dev->dev, "invalid id size");
374 dev->id_avail = 0x0c;
375 }
376 } else if ((ioread8(idmem + 0) == 'I') &&
377 (ioread8(idmem + 1) == 'V') &&
378 (ioread8(idmem + 2) == 'A') &&
379 (ioread8(idmem + 3) == 'T') &&
380 (ioread8(idmem + 4) == ' ') &&
381 (ioread8(idmem + 5) == '4')) {
382 dev->id_format = IPACK_ID_VERSION_2;
383 dev->id_avail = ioread16be(idmem + 0x16);
384 if ((dev->id_avail < 0x1a) || (dev->id_avail > 0x40)) {
385 dev_warn(&dev->dev, "invalid id size");
386 dev->id_avail = 0x1a;
387 }
388 } else {
389 dev->id_format = IPACK_ID_VERSION_INVALID;
390 dev->id_avail = 0;
391 }
392
393 if (!dev->id_avail) {
394 ret = -ENODEV;
395 goto out;
396 }
397
398 /* Obtain the amount of memory required to store a copy of the complete
399 * ID ROM contents */
400 dev->id = kmalloc(dev->id_avail, GFP_KERNEL);
401 if (!dev->id) {
402 ret = -ENOMEM;
403 goto out;
404 }
405 for (i = 0; i < dev->id_avail; i++) {
406 if (dev->id_format == IPACK_ID_VERSION_1)
407 dev->id[i] = ioread8(idmem + (i << 1) + 1);
408 else
409 dev->id[i] = ioread8(idmem + i);
410 }
411
412 /* now we can finally work with the copy */
413 switch (dev->id_format) {
414 case IPACK_ID_VERSION_1:
415 ipack_parse_id1(dev);
416 break;
417 case IPACK_ID_VERSION_2:
418 ipack_parse_id2(dev);
419 break;
420 }
421
422out:
423 iounmap(idmem);
424
425 return ret;
426}
427
428int ipack_device_init(struct ipack_device *dev)
429{
430 int ret;
431
432 dev->dev.bus = &ipack_bus_type;
433 dev->dev.release = ipack_device_release;
434 dev->dev.parent = dev->bus->parent;
435 dev_set_name(&dev->dev,
436 "ipack-dev.%u.%u", dev->bus->bus_nr, dev->slot);
437 device_initialize(&dev->dev);
438
439 if (dev->bus->ops->set_clockrate(dev, 8))
440 dev_warn(&dev->dev, "failed to switch to 8 MHz operation for reading of device ID.\n");
441 if (dev->bus->ops->reset_timeout(dev))
442 dev_warn(&dev->dev, "failed to reset potential timeout.");
443
444 ret = ipack_device_read_id(dev);
445 if (ret < 0) {
446 dev_err(&dev->dev, "error reading device id section.\n");
447 return ret;
448 }
449
450 /* if the device supports 32 MHz operation, use it. */
451 if (dev->speed_32mhz) {
452 ret = dev->bus->ops->set_clockrate(dev, 32);
453 if (ret < 0)
454 dev_err(&dev->dev, "failed to switch to 32 MHz operation.\n");
455 }
456
457 return 0;
458}
459EXPORT_SYMBOL_GPL(ipack_device_init);
460
461int ipack_device_add(struct ipack_device *dev)
462{
463 return device_add(&dev->dev);
464}
465EXPORT_SYMBOL_GPL(ipack_device_add);
466
467void ipack_device_del(struct ipack_device *dev)
468{
469 device_del(&dev->dev);
470 ipack_put_device(dev);
471}
472EXPORT_SYMBOL_GPL(ipack_device_del);
473
474void ipack_get_device(struct ipack_device *dev)
475{
476 get_device(&dev->dev);
477}
478EXPORT_SYMBOL_GPL(ipack_get_device);
479
480void ipack_put_device(struct ipack_device *dev)
481{
482 put_device(&dev->dev);
483}
484EXPORT_SYMBOL_GPL(ipack_put_device);
485
486static int __init ipack_init(void)
487{
488 ida_init(&ipack_ida);
489 return bus_register(&ipack_bus_type);
490}
491
492static void __exit ipack_exit(void)
493{
494 bus_unregister(&ipack_bus_type);
495 ida_destroy(&ipack_ida);
496}
497
498module_init(ipack_init);
499module_exit(ipack_exit);
500
501MODULE_AUTHOR("Samuel Iglesias Gonsalvez <siglesias@igalia.com>");
502MODULE_LICENSE("GPL");
503MODULE_DESCRIPTION("Industry-pack bus core");
1/*
2 * Industry-pack bus support functions.
3 *
4 * Copyright (C) 2011-2012 CERN (www.cern.ch)
5 * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
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 Free
9 * Software Foundation; version 2 of the License.
10 */
11
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/idr.h>
15#include <linux/io.h>
16#include <linux/ipack.h>
17
18#define to_ipack_dev(device) container_of(device, struct ipack_device, dev)
19#define to_ipack_driver(drv) container_of(drv, struct ipack_driver, driver)
20
21static DEFINE_IDA(ipack_ida);
22
23static void ipack_device_release(struct device *dev)
24{
25 struct ipack_device *device = to_ipack_dev(dev);
26 kfree(device->id);
27 device->release(device);
28}
29
30static inline const struct ipack_device_id *
31ipack_match_one_device(const struct ipack_device_id *id,
32 const struct ipack_device *device)
33{
34 if ((id->format == IPACK_ANY_FORMAT ||
35 id->format == device->id_format) &&
36 (id->vendor == IPACK_ANY_ID || id->vendor == device->id_vendor) &&
37 (id->device == IPACK_ANY_ID || id->device == device->id_device))
38 return id;
39 return NULL;
40}
41
42static const struct ipack_device_id *
43ipack_match_id(const struct ipack_device_id *ids, struct ipack_device *idev)
44{
45 if (ids) {
46 while (ids->vendor || ids->device) {
47 if (ipack_match_one_device(ids, idev))
48 return ids;
49 ids++;
50 }
51 }
52 return NULL;
53}
54
55static int ipack_bus_match(struct device *dev, struct device_driver *drv)
56{
57 struct ipack_device *idev = to_ipack_dev(dev);
58 struct ipack_driver *idrv = to_ipack_driver(drv);
59 const struct ipack_device_id *found_id;
60
61 found_id = ipack_match_id(idrv->id_table, idev);
62 return found_id ? 1 : 0;
63}
64
65static int ipack_bus_probe(struct device *device)
66{
67 struct ipack_device *dev = to_ipack_dev(device);
68 struct ipack_driver *drv = to_ipack_driver(device->driver);
69
70 if (!drv->ops->probe)
71 return -EINVAL;
72
73 return drv->ops->probe(dev);
74}
75
76static int ipack_bus_remove(struct device *device)
77{
78 struct ipack_device *dev = to_ipack_dev(device);
79 struct ipack_driver *drv = to_ipack_driver(device->driver);
80
81 if (!drv->ops->remove)
82 return -EINVAL;
83
84 drv->ops->remove(dev);
85 return 0;
86}
87
88static int ipack_uevent(struct device *dev, struct kobj_uevent_env *env)
89{
90 struct ipack_device *idev;
91
92 if (!dev)
93 return -ENODEV;
94
95 idev = to_ipack_dev(dev);
96
97 if (add_uevent_var(env,
98 "MODALIAS=ipack:f%02Xv%08Xd%08X", idev->id_format,
99 idev->id_vendor, idev->id_device))
100 return -ENOMEM;
101
102 return 0;
103}
104
105#define ipack_device_attr(field, format_string) \
106static ssize_t \
107field##_show(struct device *dev, struct device_attribute *attr, \
108 char *buf) \
109{ \
110 struct ipack_device *idev = to_ipack_dev(dev); \
111 return sprintf(buf, format_string, idev->field); \
112}
113
114static ssize_t id_show(struct device *dev,
115 struct device_attribute *attr, char *buf)
116{
117 unsigned int i, c, l, s;
118 struct ipack_device *idev = to_ipack_dev(dev);
119
120
121 switch (idev->id_format) {
122 case IPACK_ID_VERSION_1:
123 l = 0x7; s = 1; break;
124 case IPACK_ID_VERSION_2:
125 l = 0xf; s = 2; break;
126 default:
127 return -EIO;
128 }
129 c = 0;
130 for (i = 0; i < idev->id_avail; i++) {
131 if (i > 0) {
132 if ((i & l) == 0)
133 buf[c++] = '\n';
134 else if ((i & s) == 0)
135 buf[c++] = ' ';
136 }
137 sprintf(&buf[c], "%02x", idev->id[i]);
138 c += 2;
139 }
140 buf[c++] = '\n';
141 return c;
142}
143
144static ssize_t
145id_vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
146{
147 struct ipack_device *idev = to_ipack_dev(dev);
148 switch (idev->id_format) {
149 case IPACK_ID_VERSION_1:
150 return sprintf(buf, "0x%02x\n", idev->id_vendor);
151 case IPACK_ID_VERSION_2:
152 return sprintf(buf, "0x%06x\n", idev->id_vendor);
153 default:
154 return -EIO;
155 }
156}
157
158static ssize_t
159id_device_show(struct device *dev, struct device_attribute *attr, char *buf)
160{
161 struct ipack_device *idev = to_ipack_dev(dev);
162 switch (idev->id_format) {
163 case IPACK_ID_VERSION_1:
164 return sprintf(buf, "0x%02x\n", idev->id_device);
165 case IPACK_ID_VERSION_2:
166 return sprintf(buf, "0x%04x\n", idev->id_device);
167 default:
168 return -EIO;
169 }
170}
171
172static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
173 char *buf)
174{
175 struct ipack_device *idev = to_ipack_dev(dev);
176
177 return sprintf(buf, "ipac:f%02Xv%08Xd%08X", idev->id_format,
178 idev->id_vendor, idev->id_device);
179}
180
181ipack_device_attr(id_format, "0x%hhu\n");
182
183static DEVICE_ATTR_RO(id);
184static DEVICE_ATTR_RO(id_device);
185static DEVICE_ATTR_RO(id_format);
186static DEVICE_ATTR_RO(id_vendor);
187static DEVICE_ATTR_RO(modalias);
188
189static struct attribute *ipack_attrs[] = {
190 &dev_attr_id.attr,
191 &dev_attr_id_device.attr,
192 &dev_attr_id_format.attr,
193 &dev_attr_id_vendor.attr,
194 &dev_attr_modalias.attr,
195 NULL,
196};
197ATTRIBUTE_GROUPS(ipack);
198
199static struct bus_type ipack_bus_type = {
200 .name = "ipack",
201 .probe = ipack_bus_probe,
202 .match = ipack_bus_match,
203 .remove = ipack_bus_remove,
204 .dev_groups = ipack_groups,
205 .uevent = ipack_uevent,
206};
207
208struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots,
209 const struct ipack_bus_ops *ops,
210 struct module *owner)
211{
212 int bus_nr;
213 struct ipack_bus_device *bus;
214
215 bus = kzalloc(sizeof(struct ipack_bus_device), GFP_KERNEL);
216 if (!bus)
217 return NULL;
218
219 bus_nr = ida_simple_get(&ipack_ida, 0, 0, GFP_KERNEL);
220 if (bus_nr < 0) {
221 kfree(bus);
222 return NULL;
223 }
224
225 bus->bus_nr = bus_nr;
226 bus->parent = parent;
227 bus->slots = slots;
228 bus->ops = ops;
229 bus->owner = owner;
230 return bus;
231}
232EXPORT_SYMBOL_GPL(ipack_bus_register);
233
234static int ipack_unregister_bus_member(struct device *dev, void *data)
235{
236 struct ipack_device *idev = to_ipack_dev(dev);
237 struct ipack_bus_device *bus = data;
238
239 if (idev->bus == bus)
240 ipack_device_del(idev);
241
242 return 1;
243}
244
245int ipack_bus_unregister(struct ipack_bus_device *bus)
246{
247 bus_for_each_dev(&ipack_bus_type, NULL, bus,
248 ipack_unregister_bus_member);
249 ida_simple_remove(&ipack_ida, bus->bus_nr);
250 kfree(bus);
251 return 0;
252}
253EXPORT_SYMBOL_GPL(ipack_bus_unregister);
254
255int ipack_driver_register(struct ipack_driver *edrv, struct module *owner,
256 const char *name)
257{
258 edrv->driver.owner = owner;
259 edrv->driver.name = name;
260 edrv->driver.bus = &ipack_bus_type;
261 return driver_register(&edrv->driver);
262}
263EXPORT_SYMBOL_GPL(ipack_driver_register);
264
265void ipack_driver_unregister(struct ipack_driver *edrv)
266{
267 driver_unregister(&edrv->driver);
268}
269EXPORT_SYMBOL_GPL(ipack_driver_unregister);
270
271static u16 ipack_crc_byte(u16 crc, u8 c)
272{
273 int i;
274
275 crc ^= c << 8;
276 for (i = 0; i < 8; i++)
277 crc = (crc << 1) ^ ((crc & 0x8000) ? 0x1021 : 0);
278 return crc;
279}
280
281/*
282 * The algorithm in lib/crc-ccitt.c does not seem to apply since it uses the
283 * opposite bit ordering.
284 */
285static u8 ipack_calc_crc1(struct ipack_device *dev)
286{
287 u8 c;
288 u16 crc;
289 unsigned int i;
290
291 crc = 0xffff;
292 for (i = 0; i < dev->id_avail; i++) {
293 c = (i != 11) ? dev->id[i] : 0;
294 crc = ipack_crc_byte(crc, c);
295 }
296 crc = ~crc;
297 return crc & 0xff;
298}
299
300static u16 ipack_calc_crc2(struct ipack_device *dev)
301{
302 u8 c;
303 u16 crc;
304 unsigned int i;
305
306 crc = 0xffff;
307 for (i = 0; i < dev->id_avail; i++) {
308 c = ((i != 0x18) && (i != 0x19)) ? dev->id[i] : 0;
309 crc = ipack_crc_byte(crc, c);
310 }
311 crc = ~crc;
312 return crc;
313}
314
315static void ipack_parse_id1(struct ipack_device *dev)
316{
317 u8 *id = dev->id;
318 u8 crc;
319
320 dev->id_vendor = id[4];
321 dev->id_device = id[5];
322 dev->speed_8mhz = 1;
323 dev->speed_32mhz = (id[7] == 'H');
324 crc = ipack_calc_crc1(dev);
325 dev->id_crc_correct = (crc == id[11]);
326 if (!dev->id_crc_correct) {
327 dev_warn(&dev->dev, "ID CRC invalid found 0x%x, expected 0x%x.\n",
328 id[11], crc);
329 }
330}
331
332static void ipack_parse_id2(struct ipack_device *dev)
333{
334 __be16 *id = (__be16 *) dev->id;
335 u16 flags, crc;
336
337 dev->id_vendor = ((be16_to_cpu(id[3]) & 0xff) << 16)
338 + be16_to_cpu(id[4]);
339 dev->id_device = be16_to_cpu(id[5]);
340 flags = be16_to_cpu(id[10]);
341 dev->speed_8mhz = !!(flags & 2);
342 dev->speed_32mhz = !!(flags & 4);
343 crc = ipack_calc_crc2(dev);
344 dev->id_crc_correct = (crc == be16_to_cpu(id[12]));
345 if (!dev->id_crc_correct) {
346 dev_warn(&dev->dev, "ID CRC invalid found 0x%x, expected 0x%x.\n",
347 id[11], crc);
348 }
349}
350
351static int ipack_device_read_id(struct ipack_device *dev)
352{
353 u8 __iomem *idmem;
354 int i;
355 int ret = 0;
356
357 idmem = ioremap(dev->region[IPACK_ID_SPACE].start,
358 dev->region[IPACK_ID_SPACE].size);
359 if (!idmem) {
360 dev_err(&dev->dev, "error mapping memory\n");
361 return -ENOMEM;
362 }
363
364 /* Determine ID PROM Data Format. If we find the ids "IPAC" or "IPAH"
365 * we are dealing with a IndustryPack format 1 device. If we detect
366 * "VITA4 " (16 bit big endian formatted) we are dealing with a
367 * IndustryPack format 2 device */
368 if ((ioread8(idmem + 1) == 'I') &&
369 (ioread8(idmem + 3) == 'P') &&
370 (ioread8(idmem + 5) == 'A') &&
371 ((ioread8(idmem + 7) == 'C') ||
372 (ioread8(idmem + 7) == 'H'))) {
373 dev->id_format = IPACK_ID_VERSION_1;
374 dev->id_avail = ioread8(idmem + 0x15);
375 if ((dev->id_avail < 0x0c) || (dev->id_avail > 0x40)) {
376 dev_warn(&dev->dev, "invalid id size");
377 dev->id_avail = 0x0c;
378 }
379 } else if ((ioread8(idmem + 0) == 'I') &&
380 (ioread8(idmem + 1) == 'V') &&
381 (ioread8(idmem + 2) == 'A') &&
382 (ioread8(idmem + 3) == 'T') &&
383 (ioread8(idmem + 4) == ' ') &&
384 (ioread8(idmem + 5) == '4')) {
385 dev->id_format = IPACK_ID_VERSION_2;
386 dev->id_avail = ioread16be(idmem + 0x16);
387 if ((dev->id_avail < 0x1a) || (dev->id_avail > 0x40)) {
388 dev_warn(&dev->dev, "invalid id size");
389 dev->id_avail = 0x1a;
390 }
391 } else {
392 dev->id_format = IPACK_ID_VERSION_INVALID;
393 dev->id_avail = 0;
394 }
395
396 if (!dev->id_avail) {
397 ret = -ENODEV;
398 goto out;
399 }
400
401 /* Obtain the amount of memory required to store a copy of the complete
402 * ID ROM contents */
403 dev->id = kmalloc(dev->id_avail, GFP_KERNEL);
404 if (!dev->id) {
405 dev_err(&dev->dev, "dev->id alloc failed.\n");
406 ret = -ENOMEM;
407 goto out;
408 }
409 for (i = 0; i < dev->id_avail; i++) {
410 if (dev->id_format == IPACK_ID_VERSION_1)
411 dev->id[i] = ioread8(idmem + (i << 1) + 1);
412 else
413 dev->id[i] = ioread8(idmem + i);
414 }
415
416 /* now we can finally work with the copy */
417 switch (dev->id_format) {
418 case IPACK_ID_VERSION_1:
419 ipack_parse_id1(dev);
420 break;
421 case IPACK_ID_VERSION_2:
422 ipack_parse_id2(dev);
423 break;
424 }
425
426out:
427 iounmap(idmem);
428
429 return ret;
430}
431
432int ipack_device_init(struct ipack_device *dev)
433{
434 int ret;
435
436 dev->dev.bus = &ipack_bus_type;
437 dev->dev.release = ipack_device_release;
438 dev->dev.parent = dev->bus->parent;
439 dev_set_name(&dev->dev,
440 "ipack-dev.%u.%u", dev->bus->bus_nr, dev->slot);
441 device_initialize(&dev->dev);
442
443 if (dev->bus->ops->set_clockrate(dev, 8))
444 dev_warn(&dev->dev, "failed to switch to 8 MHz operation for reading of device ID.\n");
445 if (dev->bus->ops->reset_timeout(dev))
446 dev_warn(&dev->dev, "failed to reset potential timeout.");
447
448 ret = ipack_device_read_id(dev);
449 if (ret < 0) {
450 dev_err(&dev->dev, "error reading device id section.\n");
451 return ret;
452 }
453
454 /* if the device supports 32 MHz operation, use it. */
455 if (dev->speed_32mhz) {
456 ret = dev->bus->ops->set_clockrate(dev, 32);
457 if (ret < 0)
458 dev_err(&dev->dev, "failed to switch to 32 MHz operation.\n");
459 }
460
461 return 0;
462}
463EXPORT_SYMBOL_GPL(ipack_device_init);
464
465int ipack_device_add(struct ipack_device *dev)
466{
467 return device_add(&dev->dev);
468}
469EXPORT_SYMBOL_GPL(ipack_device_add);
470
471void ipack_device_del(struct ipack_device *dev)
472{
473 device_del(&dev->dev);
474 ipack_put_device(dev);
475}
476EXPORT_SYMBOL_GPL(ipack_device_del);
477
478void ipack_get_device(struct ipack_device *dev)
479{
480 get_device(&dev->dev);
481}
482EXPORT_SYMBOL_GPL(ipack_get_device);
483
484void ipack_put_device(struct ipack_device *dev)
485{
486 put_device(&dev->dev);
487}
488EXPORT_SYMBOL_GPL(ipack_put_device);
489
490static int __init ipack_init(void)
491{
492 ida_init(&ipack_ida);
493 return bus_register(&ipack_bus_type);
494}
495
496static void __exit ipack_exit(void)
497{
498 bus_unregister(&ipack_bus_type);
499 ida_destroy(&ipack_ida);
500}
501
502module_init(ipack_init);
503module_exit(ipack_exit);
504
505MODULE_AUTHOR("Samuel Iglesias Gonsalvez <siglesias@igalia.com>");
506MODULE_LICENSE("GPL");
507MODULE_DESCRIPTION("Industry-pack bus core");