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0508ad1f JK |
1 | /* |
2 | * FSI core driver | |
3 | * | |
4 | * Copyright (C) IBM Corporation 2016 | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
2b545cd8 | 16 | #include <linux/crc4.h> |
0508ad1f JK |
17 | #include <linux/device.h> |
18 | #include <linux/fsi.h> | |
09aecfab | 19 | #include <linux/idr.h> |
0508ad1f | 20 | #include <linux/module.h> |
2b545cd8 | 21 | #include <linux/slab.h> |
f7ade2a6 | 22 | #include <linux/bitops.h> |
0508ad1f | 23 | |
09aecfab JK |
24 | #include "fsi-master.h" |
25 | ||
66433b05 JK |
26 | #define CREATE_TRACE_POINTS |
27 | #include <trace/events/fsi.h> | |
28 | ||
f7ade2a6 JK |
29 | #define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31) |
30 | #define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16) | |
31 | #define FSI_SLAVE_CONF_SLOTS_SHIFT 16 | |
32 | #define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12) | |
33 | #define FSI_SLAVE_CONF_VERSION_SHIFT 12 | |
34 | #define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4) | |
35 | #define FSI_SLAVE_CONF_TYPE_SHIFT 4 | |
36 | #define FSI_SLAVE_CONF_CRC_SHIFT 4 | |
37 | #define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0) | |
38 | #define FSI_SLAVE_CONF_DATA_BITS 28 | |
39 | ||
4efe37f4 JK |
40 | #define FSI_PEEK_BASE 0x410 |
41 | ||
f7ade2a6 JK |
42 | static const int engine_page_size = 0x400; |
43 | ||
2b37c3e2 CB |
44 | #define FSI_SLAVE_BASE 0x800 |
45 | ||
46 | /* | |
47 | * FSI slave engine control register offsets | |
48 | */ | |
1fa847d7 JK |
49 | #define FSI_SMODE 0x0 /* R/W: Mode register */ |
50 | #define FSI_SISC 0x8 /* R/W: Interrupt condition */ | |
51 | #define FSI_SSTAT 0x14 /* R : Slave status */ | |
2b37c3e2 CB |
52 | |
53 | /* | |
54 | * SMODE fields | |
55 | */ | |
56 | #define FSI_SMODE_WSC 0x80000000 /* Warm start done */ | |
57 | #define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */ | |
58 | #define FSI_SMODE_SID_SHIFT 24 /* ID shift */ | |
59 | #define FSI_SMODE_SID_MASK 3 /* ID Mask */ | |
60 | #define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */ | |
61 | #define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */ | |
62 | #define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */ | |
63 | #define FSI_SMODE_SD_MASK 0xf /* Send delay mask */ | |
64 | #define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ | |
65 | #define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ | |
66 | ||
2b545cd8 JK |
67 | #define FSI_SLAVE_SIZE_23b 0x800000 |
68 | ||
09aecfab JK |
69 | static DEFINE_IDA(master_ida); |
70 | ||
faf0b116 JK |
71 | struct fsi_slave { |
72 | struct device dev; | |
73 | struct fsi_master *master; | |
74 | int id; | |
75 | int link; | |
76 | uint32_t size; /* size of slave address space */ | |
77 | }; | |
78 | ||
cd0fdb5c | 79 | #define to_fsi_master(d) container_of(d, struct fsi_master, dev) |
faf0b116 JK |
80 | #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) |
81 | ||
1fa847d7 JK |
82 | static const int slave_retries = 2; |
83 | static int discard_errors; | |
84 | ||
014c2abc JK |
85 | static int fsi_master_read(struct fsi_master *master, int link, |
86 | uint8_t slave_id, uint32_t addr, void *val, size_t size); | |
87 | static int fsi_master_write(struct fsi_master *master, int link, | |
88 | uint8_t slave_id, uint32_t addr, const void *val, size_t size); | |
1fa847d7 | 89 | static int fsi_master_break(struct fsi_master *master, int link); |
4efe37f4 JK |
90 | |
91 | /* | |
92 | * fsi_device_read() / fsi_device_write() / fsi_device_peek() | |
93 | * | |
94 | * FSI endpoint-device support | |
95 | * | |
96 | * Read / write / peek accessors for a client | |
97 | * | |
98 | * Parameters: | |
99 | * dev: Structure passed to FSI client device drivers on probe(). | |
100 | * addr: FSI address of given device. Client should pass in its base address | |
101 | * plus desired offset to access its register space. | |
102 | * val: For read/peek this is the value read at the specified address. For | |
103 | * write this is value to write to the specified address. | |
104 | * The data in val must be FSI bus endian (big endian). | |
105 | * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. | |
106 | * Addresses must be aligned on size boundaries or an error will result. | |
107 | */ | |
108 | int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, | |
109 | size_t size) | |
110 | { | |
111 | if (addr > dev->size || size > dev->size || addr > dev->size - size) | |
112 | return -EINVAL; | |
113 | ||
114 | return fsi_slave_read(dev->slave, dev->addr + addr, val, size); | |
115 | } | |
116 | EXPORT_SYMBOL_GPL(fsi_device_read); | |
117 | ||
118 | int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, | |
119 | size_t size) | |
120 | { | |
121 | if (addr > dev->size || size > dev->size || addr > dev->size - size) | |
122 | return -EINVAL; | |
123 | ||
124 | return fsi_slave_write(dev->slave, dev->addr + addr, val, size); | |
125 | } | |
126 | EXPORT_SYMBOL_GPL(fsi_device_write); | |
127 | ||
128 | int fsi_device_peek(struct fsi_device *dev, void *val) | |
129 | { | |
130 | uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); | |
014c2abc | 131 | |
4efe37f4 JK |
132 | return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); |
133 | } | |
f7ade2a6 JK |
134 | |
135 | static void fsi_device_release(struct device *_device) | |
136 | { | |
137 | struct fsi_device *device = to_fsi_dev(_device); | |
138 | ||
139 | kfree(device); | |
140 | } | |
141 | ||
142 | static struct fsi_device *fsi_create_device(struct fsi_slave *slave) | |
143 | { | |
144 | struct fsi_device *dev; | |
145 | ||
146 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
147 | if (!dev) | |
148 | return NULL; | |
149 | ||
150 | dev->dev.parent = &slave->dev; | |
151 | dev->dev.bus = &fsi_bus_type; | |
152 | dev->dev.release = fsi_device_release; | |
153 | ||
154 | return dev; | |
155 | } | |
156 | ||
414c1026 | 157 | /* FSI slave support */ |
014c2abc JK |
158 | static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, |
159 | uint8_t *idp) | |
160 | { | |
161 | uint32_t addr = *addrp; | |
162 | uint8_t id = *idp; | |
163 | ||
164 | if (addr > slave->size) | |
165 | return -EINVAL; | |
166 | ||
167 | /* For 23 bit addressing, we encode the extra two bits in the slave | |
168 | * id (and the slave's actual ID needs to be 0). | |
169 | */ | |
170 | if (addr > 0x1fffff) { | |
171 | if (slave->id != 0) | |
172 | return -EINVAL; | |
173 | id = (addr >> 21) & 0x3; | |
174 | addr &= 0x1fffff; | |
175 | } | |
176 | ||
177 | *addrp = addr; | |
178 | *idp = id; | |
179 | return 0; | |
180 | } | |
181 | ||
1fa847d7 JK |
182 | int fsi_slave_report_and_clear_errors(struct fsi_slave *slave) |
183 | { | |
184 | struct fsi_master *master = slave->master; | |
185 | uint32_t irq, stat; | |
186 | int rc, link; | |
187 | uint8_t id; | |
188 | ||
189 | link = slave->link; | |
190 | id = slave->id; | |
191 | ||
192 | rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC, | |
193 | &irq, sizeof(irq)); | |
194 | if (rc) | |
195 | return rc; | |
196 | ||
197 | rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT, | |
198 | &stat, sizeof(stat)); | |
199 | if (rc) | |
200 | return rc; | |
201 | ||
202 | dev_info(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n", | |
203 | be32_to_cpu(stat), be32_to_cpu(irq)); | |
204 | ||
205 | /* clear interrupts */ | |
206 | return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC, | |
207 | &irq, sizeof(irq)); | |
208 | } | |
209 | ||
210 | static int fsi_slave_set_smode(struct fsi_master *master, int link, int id); | |
211 | ||
212 | int fsi_slave_handle_error(struct fsi_slave *slave, bool write, uint32_t addr, | |
213 | size_t size) | |
214 | { | |
215 | struct fsi_master *master = slave->master; | |
216 | int rc, link; | |
217 | uint32_t reg; | |
218 | uint8_t id; | |
219 | ||
220 | if (discard_errors) | |
221 | return -1; | |
222 | ||
223 | link = slave->link; | |
224 | id = slave->id; | |
225 | ||
226 | dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]", | |
227 | write ? "write" : "read", addr, size); | |
228 | ||
229 | /* try a simple clear of error conditions, which may fail if we've lost | |
230 | * communication with the slave | |
231 | */ | |
232 | rc = fsi_slave_report_and_clear_errors(slave); | |
233 | if (!rc) | |
234 | return 0; | |
235 | ||
236 | /* send a TERM and retry */ | |
237 | if (master->term) { | |
238 | rc = master->term(master, link, id); | |
239 | if (!rc) { | |
240 | rc = fsi_master_read(master, link, id, 0, | |
241 | ®, sizeof(reg)); | |
242 | if (!rc) | |
243 | rc = fsi_slave_report_and_clear_errors(slave); | |
244 | if (!rc) | |
245 | return 0; | |
246 | } | |
247 | } | |
248 | ||
249 | /* getting serious, reset the slave via BREAK */ | |
250 | rc = fsi_master_break(master, link); | |
251 | if (rc) | |
252 | return rc; | |
253 | ||
254 | rc = fsi_slave_set_smode(master, link, id); | |
255 | if (rc) | |
256 | return rc; | |
257 | ||
258 | return fsi_slave_report_and_clear_errors(slave); | |
259 | } | |
260 | ||
da36cadf | 261 | int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, |
014c2abc JK |
262 | void *val, size_t size) |
263 | { | |
264 | uint8_t id = slave->id; | |
1fa847d7 | 265 | int rc, err_rc, i; |
014c2abc JK |
266 | |
267 | rc = fsi_slave_calc_addr(slave, &addr, &id); | |
268 | if (rc) | |
269 | return rc; | |
270 | ||
1fa847d7 JK |
271 | for (i = 0; i < slave_retries; i++) { |
272 | rc = fsi_master_read(slave->master, slave->link, | |
273 | id, addr, val, size); | |
274 | if (!rc) | |
275 | break; | |
276 | ||
277 | err_rc = fsi_slave_handle_error(slave, false, addr, size); | |
278 | if (err_rc) | |
279 | break; | |
280 | } | |
281 | ||
282 | return rc; | |
014c2abc | 283 | } |
da36cadf | 284 | EXPORT_SYMBOL_GPL(fsi_slave_read); |
014c2abc | 285 | |
da36cadf | 286 | int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, |
014c2abc JK |
287 | const void *val, size_t size) |
288 | { | |
289 | uint8_t id = slave->id; | |
1fa847d7 | 290 | int rc, err_rc, i; |
014c2abc JK |
291 | |
292 | rc = fsi_slave_calc_addr(slave, &addr, &id); | |
293 | if (rc) | |
294 | return rc; | |
295 | ||
1fa847d7 JK |
296 | for (i = 0; i < slave_retries; i++) { |
297 | rc = fsi_master_write(slave->master, slave->link, | |
298 | id, addr, val, size); | |
299 | if (!rc) | |
300 | break; | |
301 | ||
302 | err_rc = fsi_slave_handle_error(slave, true, addr, size); | |
303 | if (err_rc) | |
304 | break; | |
305 | } | |
306 | ||
307 | return rc; | |
014c2abc | 308 | } |
da36cadf JK |
309 | EXPORT_SYMBOL_GPL(fsi_slave_write); |
310 | ||
311 | extern int fsi_slave_claim_range(struct fsi_slave *slave, | |
312 | uint32_t addr, uint32_t size) | |
313 | { | |
314 | if (addr + size < addr) | |
315 | return -EINVAL; | |
316 | ||
317 | if (addr + size > slave->size) | |
318 | return -EINVAL; | |
319 | ||
320 | /* todo: check for overlapping claims */ | |
321 | return 0; | |
322 | } | |
323 | EXPORT_SYMBOL_GPL(fsi_slave_claim_range); | |
324 | ||
325 | extern void fsi_slave_release_range(struct fsi_slave *slave, | |
326 | uint32_t addr, uint32_t size) | |
327 | { | |
328 | } | |
329 | EXPORT_SYMBOL_GPL(fsi_slave_release_range); | |
014c2abc | 330 | |
f7ade2a6 JK |
331 | static int fsi_slave_scan(struct fsi_slave *slave) |
332 | { | |
333 | uint32_t engine_addr; | |
334 | uint32_t conf; | |
335 | int rc, i; | |
336 | ||
337 | /* | |
338 | * scan engines | |
339 | * | |
340 | * We keep the peek mode and slave engines for the core; so start | |
341 | * at the third slot in the configuration table. We also need to | |
342 | * skip the chip ID entry at the start of the address space. | |
343 | */ | |
344 | engine_addr = engine_page_size * 3; | |
345 | for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { | |
346 | uint8_t slots, version, type, crc; | |
347 | struct fsi_device *dev; | |
348 | ||
349 | rc = fsi_slave_read(slave, (i + 1) * sizeof(conf), | |
350 | &conf, sizeof(conf)); | |
351 | if (rc) { | |
352 | dev_warn(&slave->dev, | |
353 | "error reading slave registers\n"); | |
354 | return -1; | |
355 | } | |
356 | conf = be32_to_cpu(conf); | |
357 | ||
358 | crc = crc4(0, conf, 32); | |
359 | if (crc) { | |
360 | dev_warn(&slave->dev, | |
361 | "crc error in slave register at 0x%04x\n", | |
362 | i); | |
363 | return -1; | |
364 | } | |
365 | ||
366 | slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) | |
367 | >> FSI_SLAVE_CONF_SLOTS_SHIFT; | |
368 | version = (conf & FSI_SLAVE_CONF_VERSION_MASK) | |
369 | >> FSI_SLAVE_CONF_VERSION_SHIFT; | |
370 | type = (conf & FSI_SLAVE_CONF_TYPE_MASK) | |
371 | >> FSI_SLAVE_CONF_TYPE_SHIFT; | |
372 | ||
373 | /* | |
374 | * Unused address areas are marked by a zero type value; this | |
375 | * skips the defined address areas | |
376 | */ | |
377 | if (type != 0 && slots != 0) { | |
378 | ||
379 | /* create device */ | |
380 | dev = fsi_create_device(slave); | |
381 | if (!dev) | |
382 | return -ENOMEM; | |
383 | ||
384 | dev->slave = slave; | |
385 | dev->engine_type = type; | |
386 | dev->version = version; | |
387 | dev->unit = i; | |
388 | dev->addr = engine_addr; | |
389 | dev->size = slots * engine_page_size; | |
390 | ||
391 | dev_dbg(&slave->dev, | |
392 | "engine[%i]: type %x, version %x, addr %x size %x\n", | |
393 | dev->unit, dev->engine_type, version, | |
394 | dev->addr, dev->size); | |
395 | ||
396 | dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", | |
397 | slave->master->idx, slave->link, | |
398 | slave->id, i - 2); | |
399 | ||
400 | rc = device_register(&dev->dev); | |
401 | if (rc) { | |
402 | dev_warn(&slave->dev, "add failed: %d\n", rc); | |
403 | put_device(&dev->dev); | |
404 | } | |
405 | } | |
406 | ||
407 | engine_addr += slots * engine_page_size; | |
408 | ||
409 | if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) | |
410 | break; | |
411 | } | |
412 | ||
413 | return 0; | |
414 | } | |
415 | ||
125739cb JK |
416 | static ssize_t fsi_slave_sysfs_raw_read(struct file *file, |
417 | struct kobject *kobj, struct bin_attribute *attr, char *buf, | |
418 | loff_t off, size_t count) | |
419 | { | |
420 | struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); | |
421 | size_t total_len, read_len; | |
422 | int rc; | |
423 | ||
424 | if (off < 0) | |
425 | return -EINVAL; | |
426 | ||
427 | if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) | |
428 | return -EINVAL; | |
429 | ||
430 | for (total_len = 0; total_len < count; total_len += read_len) { | |
431 | read_len = min_t(size_t, count, 4); | |
432 | read_len -= off & 0x3; | |
433 | ||
434 | rc = fsi_slave_read(slave, off, buf + total_len, read_len); | |
435 | if (rc) | |
436 | return rc; | |
437 | ||
438 | off += read_len; | |
439 | } | |
440 | ||
441 | return count; | |
442 | } | |
443 | ||
444 | static ssize_t fsi_slave_sysfs_raw_write(struct file *file, | |
445 | struct kobject *kobj, struct bin_attribute *attr, | |
446 | char *buf, loff_t off, size_t count) | |
447 | { | |
448 | struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); | |
449 | size_t total_len, write_len; | |
450 | int rc; | |
451 | ||
452 | if (off < 0) | |
453 | return -EINVAL; | |
454 | ||
455 | if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) | |
456 | return -EINVAL; | |
457 | ||
458 | for (total_len = 0; total_len < count; total_len += write_len) { | |
459 | write_len = min_t(size_t, count, 4); | |
460 | write_len -= off & 0x3; | |
461 | ||
462 | rc = fsi_slave_write(slave, off, buf + total_len, write_len); | |
463 | if (rc) | |
464 | return rc; | |
465 | ||
466 | off += write_len; | |
467 | } | |
468 | ||
469 | return count; | |
470 | } | |
471 | ||
472 | static struct bin_attribute fsi_slave_raw_attr = { | |
473 | .attr = { | |
474 | .name = "raw", | |
475 | .mode = 0600, | |
476 | }, | |
477 | .size = 0, | |
478 | .read = fsi_slave_sysfs_raw_read, | |
479 | .write = fsi_slave_sysfs_raw_write, | |
480 | }; | |
481 | ||
482 | static ssize_t fsi_slave_sysfs_term_write(struct file *file, | |
483 | struct kobject *kobj, struct bin_attribute *attr, | |
484 | char *buf, loff_t off, size_t count) | |
485 | { | |
486 | struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); | |
487 | struct fsi_master *master = slave->master; | |
488 | ||
489 | if (!master->term) | |
490 | return -ENODEV; | |
491 | ||
492 | master->term(master, slave->link, slave->id); | |
493 | return count; | |
494 | } | |
495 | ||
496 | static struct bin_attribute fsi_slave_term_attr = { | |
497 | .attr = { | |
498 | .name = "term", | |
499 | .mode = 0200, | |
500 | }, | |
501 | .size = 0, | |
502 | .write = fsi_slave_sysfs_term_write, | |
503 | }; | |
504 | ||
2b37c3e2 CB |
505 | /* Encode slave local bus echo delay */ |
506 | static inline uint32_t fsi_smode_echodly(int x) | |
507 | { | |
508 | return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; | |
509 | } | |
510 | ||
511 | /* Encode slave local bus send delay */ | |
512 | static inline uint32_t fsi_smode_senddly(int x) | |
513 | { | |
514 | return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; | |
515 | } | |
516 | ||
517 | /* Encode slave local bus clock rate ratio */ | |
518 | static inline uint32_t fsi_smode_lbcrr(int x) | |
519 | { | |
520 | return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; | |
521 | } | |
522 | ||
523 | /* Encode slave ID */ | |
524 | static inline uint32_t fsi_smode_sid(int x) | |
525 | { | |
526 | return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; | |
527 | } | |
528 | ||
529 | static const uint32_t fsi_slave_smode(int id) | |
530 | { | |
531 | return FSI_SMODE_WSC | FSI_SMODE_ECRC | |
532 | | fsi_smode_sid(id) | |
533 | | fsi_smode_echodly(0xf) | fsi_smode_senddly(0xf) | |
534 | | fsi_smode_lbcrr(0x8); | |
535 | } | |
536 | ||
537 | static int fsi_slave_set_smode(struct fsi_master *master, int link, int id) | |
538 | { | |
539 | uint32_t smode; | |
540 | ||
541 | /* set our smode register with the slave ID field to 0; this enables | |
542 | * extended slave addressing | |
543 | */ | |
544 | smode = fsi_slave_smode(id); | |
545 | smode = cpu_to_be32(smode); | |
546 | ||
547 | return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SMODE, | |
548 | &smode, sizeof(smode)); | |
549 | } | |
550 | ||
2b545cd8 JK |
551 | static void fsi_slave_release(struct device *dev) |
552 | { | |
553 | struct fsi_slave *slave = to_fsi_slave(dev); | |
554 | ||
555 | kfree(slave); | |
556 | } | |
557 | ||
414c1026 JK |
558 | static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) |
559 | { | |
2b545cd8 JK |
560 | struct fsi_slave *slave; |
561 | uint32_t chip_id; | |
562 | uint8_t crc; | |
563 | int rc; | |
564 | ||
565 | /* Currently, we only support single slaves on a link, and use the | |
566 | * full 23-bit address range | |
567 | */ | |
568 | if (id != 0) | |
569 | return -EINVAL; | |
570 | ||
571 | rc = fsi_master_read(master, link, id, 0, &chip_id, sizeof(chip_id)); | |
572 | if (rc) { | |
573 | dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", | |
574 | link, id, rc); | |
575 | return -ENODEV; | |
576 | } | |
577 | chip_id = be32_to_cpu(chip_id); | |
578 | ||
579 | crc = crc4(0, chip_id, 32); | |
580 | if (crc) { | |
581 | dev_warn(&master->dev, "slave %02x:%02x invalid chip id CRC!\n", | |
582 | link, id); | |
583 | return -EIO; | |
584 | } | |
585 | ||
586 | dev_info(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", | |
587 | chip_id, master->idx, link, id); | |
588 | ||
2b37c3e2 CB |
589 | rc = fsi_slave_set_smode(master, link, id); |
590 | if (rc) { | |
591 | dev_warn(&master->dev, | |
592 | "can't set smode on slave:%02x:%02x %d\n", | |
593 | link, id, rc); | |
594 | return -ENODEV; | |
595 | } | |
596 | ||
2b545cd8 JK |
597 | /* We can communicate with a slave; create the slave device and |
598 | * register. | |
599 | */ | |
600 | slave = kzalloc(sizeof(*slave), GFP_KERNEL); | |
601 | if (!slave) | |
602 | return -ENOMEM; | |
603 | ||
604 | slave->master = master; | |
605 | slave->dev.parent = &master->dev; | |
606 | slave->dev.release = fsi_slave_release; | |
607 | slave->link = link; | |
608 | slave->id = id; | |
609 | slave->size = FSI_SLAVE_SIZE_23b; | |
610 | ||
611 | dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); | |
612 | rc = device_register(&slave->dev); | |
613 | if (rc < 0) { | |
614 | dev_warn(&master->dev, "failed to create slave device: %d\n", | |
615 | rc); | |
616 | put_device(&slave->dev); | |
617 | return rc; | |
618 | } | |
619 | ||
125739cb JK |
620 | rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); |
621 | if (rc) | |
622 | dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); | |
623 | ||
624 | rc = device_create_bin_file(&slave->dev, &fsi_slave_term_attr); | |
625 | if (rc) | |
626 | dev_warn(&slave->dev, "failed to create term attr: %d\n", rc); | |
627 | ||
f7ade2a6 JK |
628 | rc = fsi_slave_scan(slave); |
629 | if (rc) | |
630 | dev_dbg(&master->dev, "failed during slave scan with: %d\n", | |
631 | rc); | |
414c1026 | 632 | |
2b545cd8 | 633 | return rc; |
414c1026 JK |
634 | } |
635 | ||
09aecfab | 636 | /* FSI master support */ |
014c2abc JK |
637 | static int fsi_check_access(uint32_t addr, size_t size) |
638 | { | |
639 | if (size != 1 && size != 2 && size != 4) | |
640 | return -EINVAL; | |
641 | ||
642 | if ((addr & 0x3) != (size & 0x3)) | |
643 | return -EINVAL; | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
648 | static int fsi_master_read(struct fsi_master *master, int link, | |
649 | uint8_t slave_id, uint32_t addr, void *val, size_t size) | |
650 | { | |
651 | int rc; | |
652 | ||
66433b05 JK |
653 | trace_fsi_master_read(master, link, slave_id, addr, size); |
654 | ||
014c2abc | 655 | rc = fsi_check_access(addr, size); |
66433b05 JK |
656 | if (!rc) |
657 | rc = master->read(master, link, slave_id, addr, val, size); | |
658 | ||
659 | trace_fsi_master_rw_result(master, link, slave_id, addr, size, | |
660 | false, val, rc); | |
014c2abc | 661 | |
66433b05 | 662 | return rc; |
014c2abc JK |
663 | } |
664 | ||
665 | static int fsi_master_write(struct fsi_master *master, int link, | |
666 | uint8_t slave_id, uint32_t addr, const void *val, size_t size) | |
667 | { | |
668 | int rc; | |
669 | ||
66433b05 JK |
670 | trace_fsi_master_write(master, link, slave_id, addr, size, val); |
671 | ||
014c2abc | 672 | rc = fsi_check_access(addr, size); |
66433b05 JK |
673 | if (!rc) |
674 | rc = master->write(master, link, slave_id, addr, val, size); | |
014c2abc | 675 | |
66433b05 JK |
676 | trace_fsi_master_rw_result(master, link, slave_id, addr, size, |
677 | true, val, rc); | |
678 | ||
679 | return rc; | |
014c2abc JK |
680 | } |
681 | ||
26095282 CB |
682 | static int fsi_master_link_enable(struct fsi_master *master, int link) |
683 | { | |
684 | if (master->link_enable) | |
685 | return master->link_enable(master, link); | |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
690 | /* | |
691 | * Issue a break command on this link | |
692 | */ | |
693 | static int fsi_master_break(struct fsi_master *master, int link) | |
694 | { | |
66433b05 JK |
695 | trace_fsi_master_break(master, link); |
696 | ||
26095282 CB |
697 | if (master->send_break) |
698 | return master->send_break(master, link); | |
699 | ||
700 | return 0; | |
701 | } | |
702 | ||
414c1026 JK |
703 | static int fsi_master_scan(struct fsi_master *master) |
704 | { | |
26095282 CB |
705 | int link, rc; |
706 | ||
707 | for (link = 0; link < master->n_links; link++) { | |
708 | rc = fsi_master_link_enable(master, link); | |
709 | if (rc) { | |
710 | dev_dbg(&master->dev, | |
711 | "enable link %d failed: %d\n", link, rc); | |
712 | continue; | |
713 | } | |
714 | rc = fsi_master_break(master, link); | |
715 | if (rc) { | |
716 | dev_dbg(&master->dev, | |
717 | "break to link %d failed: %d\n", link, rc); | |
718 | continue; | |
719 | } | |
414c1026 | 720 | |
414c1026 | 721 | fsi_slave_init(master, link, 0); |
26095282 | 722 | } |
414c1026 JK |
723 | |
724 | return 0; | |
725 | } | |
726 | ||
cd0fdb5c CB |
727 | static int fsi_slave_remove_device(struct device *dev, void *arg) |
728 | { | |
729 | device_unregister(dev); | |
730 | return 0; | |
731 | } | |
732 | ||
733 | static int fsi_master_remove_slave(struct device *dev, void *arg) | |
734 | { | |
735 | device_for_each_child(dev, NULL, fsi_slave_remove_device); | |
736 | device_unregister(dev); | |
737 | return 0; | |
738 | } | |
739 | ||
740 | static void fsi_master_unscan(struct fsi_master *master) | |
741 | { | |
742 | device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); | |
743 | } | |
744 | ||
745 | static ssize_t master_rescan_store(struct device *dev, | |
746 | struct device_attribute *attr, const char *buf, size_t count) | |
747 | { | |
748 | struct fsi_master *master = to_fsi_master(dev); | |
749 | int rc; | |
750 | ||
751 | fsi_master_unscan(master); | |
752 | rc = fsi_master_scan(master); | |
753 | if (rc < 0) | |
754 | return rc; | |
755 | ||
756 | return count; | |
757 | } | |
758 | ||
759 | static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); | |
760 | ||
125739cb JK |
761 | static ssize_t master_break_store(struct device *dev, |
762 | struct device_attribute *attr, const char *buf, size_t count) | |
763 | { | |
764 | struct fsi_master *master = to_fsi_master(dev); | |
765 | ||
766 | fsi_master_break(master, 0); | |
767 | ||
768 | return count; | |
769 | } | |
770 | ||
771 | static DEVICE_ATTR(break, 0200, NULL, master_break_store); | |
772 | ||
09aecfab JK |
773 | int fsi_master_register(struct fsi_master *master) |
774 | { | |
775 | int rc; | |
776 | ||
777 | if (!master) | |
778 | return -EINVAL; | |
779 | ||
780 | master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); | |
781 | dev_set_name(&master->dev, "fsi%d", master->idx); | |
782 | ||
783 | rc = device_register(&master->dev); | |
414c1026 | 784 | if (rc) { |
09aecfab | 785 | ida_simple_remove(&master_ida, master->idx); |
414c1026 JK |
786 | return rc; |
787 | } | |
09aecfab | 788 | |
cd0fdb5c CB |
789 | rc = device_create_file(&master->dev, &dev_attr_rescan); |
790 | if (rc) { | |
791 | device_unregister(&master->dev); | |
792 | ida_simple_remove(&master_ida, master->idx); | |
793 | return rc; | |
794 | } | |
795 | ||
125739cb JK |
796 | rc = device_create_file(&master->dev, &dev_attr_break); |
797 | if (rc) { | |
798 | device_unregister(&master->dev); | |
799 | ida_simple_remove(&master_ida, master->idx); | |
800 | return rc; | |
801 | } | |
802 | ||
414c1026 | 803 | fsi_master_scan(master); |
cd0fdb5c | 804 | |
414c1026 | 805 | return 0; |
09aecfab JK |
806 | } |
807 | EXPORT_SYMBOL_GPL(fsi_master_register); | |
808 | ||
809 | void fsi_master_unregister(struct fsi_master *master) | |
810 | { | |
811 | if (master->idx >= 0) { | |
812 | ida_simple_remove(&master_ida, master->idx); | |
813 | master->idx = -1; | |
814 | } | |
815 | ||
cd0fdb5c | 816 | fsi_master_unscan(master); |
09aecfab JK |
817 | device_unregister(&master->dev); |
818 | } | |
819 | EXPORT_SYMBOL_GPL(fsi_master_unregister); | |
820 | ||
0508ad1f JK |
821 | /* FSI core & Linux bus type definitions */ |
822 | ||
dd37eed7 JK |
823 | static int fsi_bus_match(struct device *dev, struct device_driver *drv) |
824 | { | |
825 | struct fsi_device *fsi_dev = to_fsi_dev(dev); | |
826 | struct fsi_driver *fsi_drv = to_fsi_drv(drv); | |
827 | const struct fsi_device_id *id; | |
828 | ||
829 | if (!fsi_drv->id_table) | |
830 | return 0; | |
831 | ||
832 | for (id = fsi_drv->id_table; id->engine_type; id++) { | |
833 | if (id->engine_type != fsi_dev->engine_type) | |
834 | continue; | |
835 | if (id->version == FSI_VERSION_ANY || | |
836 | id->version == fsi_dev->version) | |
837 | return 1; | |
838 | } | |
839 | ||
840 | return 0; | |
841 | } | |
842 | ||
356d8009 CB |
843 | int fsi_driver_register(struct fsi_driver *fsi_drv) |
844 | { | |
845 | if (!fsi_drv) | |
846 | return -EINVAL; | |
847 | if (!fsi_drv->id_table) | |
848 | return -EINVAL; | |
849 | ||
850 | return driver_register(&fsi_drv->drv); | |
851 | } | |
852 | EXPORT_SYMBOL_GPL(fsi_driver_register); | |
853 | ||
854 | void fsi_driver_unregister(struct fsi_driver *fsi_drv) | |
855 | { | |
856 | driver_unregister(&fsi_drv->drv); | |
857 | } | |
858 | EXPORT_SYMBOL_GPL(fsi_driver_unregister); | |
859 | ||
0508ad1f JK |
860 | struct bus_type fsi_bus_type = { |
861 | .name = "fsi", | |
dd37eed7 | 862 | .match = fsi_bus_match, |
0508ad1f JK |
863 | }; |
864 | EXPORT_SYMBOL_GPL(fsi_bus_type); | |
865 | ||
866 | static int fsi_init(void) | |
867 | { | |
868 | return bus_register(&fsi_bus_type); | |
869 | } | |
870 | ||
871 | static void fsi_exit(void) | |
872 | { | |
873 | bus_unregister(&fsi_bus_type); | |
874 | } | |
875 | ||
876 | module_init(fsi_init); | |
877 | module_exit(fsi_exit); | |
1fa847d7 JK |
878 | module_param(discard_errors, int, 0664); |
879 | MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); |