Commit | Line | Data |
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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0508ad1f JK |
2 | /* |
3 | * FSI core driver | |
4 | * | |
5 | * Copyright (C) IBM Corporation 2016 | |
6 | * | |
d1dcd678 BH |
7 | * TODO: |
8 | * - Rework topology | |
9 | * - s/chip_id/chip_loc | |
10 | * - s/cfam/chip (cfam_id -> chip_id etc...) | |
0508ad1f JK |
11 | */ |
12 | ||
2b545cd8 | 13 | #include <linux/crc4.h> |
0508ad1f JK |
14 | #include <linux/device.h> |
15 | #include <linux/fsi.h> | |
09aecfab | 16 | #include <linux/idr.h> |
0508ad1f | 17 | #include <linux/module.h> |
f6a2f8eb | 18 | #include <linux/of.h> |
2b545cd8 | 19 | #include <linux/slab.h> |
f7ade2a6 | 20 | #include <linux/bitops.h> |
d1dcd678 BH |
21 | #include <linux/cdev.h> |
22 | #include <linux/fs.h> | |
23 | #include <linux/uaccess.h> | |
0508ad1f | 24 | |
09aecfab JK |
25 | #include "fsi-master.h" |
26 | ||
66433b05 JK |
27 | #define CREATE_TRACE_POINTS |
28 | #include <trace/events/fsi.h> | |
29 | ||
f7ade2a6 JK |
30 | #define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31) |
31 | #define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16) | |
32 | #define FSI_SLAVE_CONF_SLOTS_SHIFT 16 | |
33 | #define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12) | |
34 | #define FSI_SLAVE_CONF_VERSION_SHIFT 12 | |
35 | #define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4) | |
36 | #define FSI_SLAVE_CONF_TYPE_SHIFT 4 | |
37 | #define FSI_SLAVE_CONF_CRC_SHIFT 4 | |
38 | #define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0) | |
39 | #define FSI_SLAVE_CONF_DATA_BITS 28 | |
40 | ||
4efe37f4 JK |
41 | #define FSI_PEEK_BASE 0x410 |
42 | ||
f7ade2a6 JK |
43 | static const int engine_page_size = 0x400; |
44 | ||
2b37c3e2 CB |
45 | #define FSI_SLAVE_BASE 0x800 |
46 | ||
47 | /* | |
48 | * FSI slave engine control register offsets | |
49 | */ | |
1fa847d7 JK |
50 | #define FSI_SMODE 0x0 /* R/W: Mode register */ |
51 | #define FSI_SISC 0x8 /* R/W: Interrupt condition */ | |
52 | #define FSI_SSTAT 0x14 /* R : Slave status */ | |
4af889b0 | 53 | #define FSI_LLMODE 0x100 /* R/W: Link layer mode register */ |
2b37c3e2 CB |
54 | |
55 | /* | |
56 | * SMODE fields | |
57 | */ | |
58 | #define FSI_SMODE_WSC 0x80000000 /* Warm start done */ | |
59 | #define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */ | |
60 | #define FSI_SMODE_SID_SHIFT 24 /* ID shift */ | |
61 | #define FSI_SMODE_SID_MASK 3 /* ID Mask */ | |
62 | #define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */ | |
63 | #define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */ | |
64 | #define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */ | |
65 | #define FSI_SMODE_SD_MASK 0xf /* Send delay mask */ | |
66 | #define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ | |
67 | #define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ | |
68 | ||
4af889b0 JK |
69 | /* |
70 | * LLMODE fields | |
71 | */ | |
72 | #define FSI_LLMODE_ASYNC 0x1 | |
73 | ||
2b545cd8 JK |
74 | #define FSI_SLAVE_SIZE_23b 0x800000 |
75 | ||
09aecfab JK |
76 | static DEFINE_IDA(master_ida); |
77 | ||
faf0b116 JK |
78 | struct fsi_slave { |
79 | struct device dev; | |
80 | struct fsi_master *master; | |
d1dcd678 BH |
81 | struct cdev cdev; |
82 | int cdev_idx; | |
83 | int id; /* FSI address */ | |
84 | int link; /* FSI link# */ | |
85 | u32 cfam_id; | |
0a213777 | 86 | int chip_id; |
faf0b116 | 87 | uint32_t size; /* size of slave address space */ |
a2e7da86 BH |
88 | u8 t_send_delay; |
89 | u8 t_echo_delay; | |
faf0b116 JK |
90 | }; |
91 | ||
cd0fdb5c | 92 | #define to_fsi_master(d) container_of(d, struct fsi_master, dev) |
faf0b116 JK |
93 | #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) |
94 | ||
1fa847d7 JK |
95 | static const int slave_retries = 2; |
96 | static int discard_errors; | |
97 | ||
0ab5fe53 BH |
98 | static dev_t fsi_base_dev; |
99 | static DEFINE_IDA(fsi_minor_ida); | |
100 | #define FSI_CHAR_MAX_DEVICES 0x1000 | |
101 | ||
102 | /* Legacy /dev numbering: 4 devices per chip, 16 chips */ | |
103 | #define FSI_CHAR_LEGACY_TOP 64 | |
104 | ||
014c2abc JK |
105 | static int fsi_master_read(struct fsi_master *master, int link, |
106 | uint8_t slave_id, uint32_t addr, void *val, size_t size); | |
107 | static int fsi_master_write(struct fsi_master *master, int link, | |
108 | uint8_t slave_id, uint32_t addr, const void *val, size_t size); | |
1fa847d7 | 109 | static int fsi_master_break(struct fsi_master *master, int link); |
4efe37f4 JK |
110 | |
111 | /* | |
112 | * fsi_device_read() / fsi_device_write() / fsi_device_peek() | |
113 | * | |
114 | * FSI endpoint-device support | |
115 | * | |
116 | * Read / write / peek accessors for a client | |
117 | * | |
118 | * Parameters: | |
119 | * dev: Structure passed to FSI client device drivers on probe(). | |
120 | * addr: FSI address of given device. Client should pass in its base address | |
121 | * plus desired offset to access its register space. | |
122 | * val: For read/peek this is the value read at the specified address. For | |
123 | * write this is value to write to the specified address. | |
124 | * The data in val must be FSI bus endian (big endian). | |
125 | * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. | |
126 | * Addresses must be aligned on size boundaries or an error will result. | |
127 | */ | |
128 | int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, | |
129 | size_t size) | |
130 | { | |
131 | if (addr > dev->size || size > dev->size || addr > dev->size - size) | |
132 | return -EINVAL; | |
133 | ||
134 | return fsi_slave_read(dev->slave, dev->addr + addr, val, size); | |
135 | } | |
136 | EXPORT_SYMBOL_GPL(fsi_device_read); | |
137 | ||
138 | int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, | |
139 | size_t size) | |
140 | { | |
141 | if (addr > dev->size || size > dev->size || addr > dev->size - size) | |
142 | return -EINVAL; | |
143 | ||
144 | return fsi_slave_write(dev->slave, dev->addr + addr, val, size); | |
145 | } | |
146 | EXPORT_SYMBOL_GPL(fsi_device_write); | |
147 | ||
148 | int fsi_device_peek(struct fsi_device *dev, void *val) | |
149 | { | |
150 | uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); | |
014c2abc | 151 | |
4efe37f4 JK |
152 | return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); |
153 | } | |
f7ade2a6 JK |
154 | |
155 | static void fsi_device_release(struct device *_device) | |
156 | { | |
157 | struct fsi_device *device = to_fsi_dev(_device); | |
158 | ||
f6a2f8eb | 159 | of_node_put(device->dev.of_node); |
f7ade2a6 JK |
160 | kfree(device); |
161 | } | |
162 | ||
163 | static struct fsi_device *fsi_create_device(struct fsi_slave *slave) | |
164 | { | |
165 | struct fsi_device *dev; | |
166 | ||
167 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
168 | if (!dev) | |
169 | return NULL; | |
170 | ||
171 | dev->dev.parent = &slave->dev; | |
172 | dev->dev.bus = &fsi_bus_type; | |
173 | dev->dev.release = fsi_device_release; | |
174 | ||
175 | return dev; | |
176 | } | |
177 | ||
414c1026 | 178 | /* FSI slave support */ |
014c2abc JK |
179 | static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, |
180 | uint8_t *idp) | |
181 | { | |
182 | uint32_t addr = *addrp; | |
183 | uint8_t id = *idp; | |
184 | ||
185 | if (addr > slave->size) | |
186 | return -EINVAL; | |
187 | ||
188 | /* For 23 bit addressing, we encode the extra two bits in the slave | |
189 | * id (and the slave's actual ID needs to be 0). | |
190 | */ | |
191 | if (addr > 0x1fffff) { | |
192 | if (slave->id != 0) | |
193 | return -EINVAL; | |
194 | id = (addr >> 21) & 0x3; | |
195 | addr &= 0x1fffff; | |
196 | } | |
197 | ||
198 | *addrp = addr; | |
199 | *idp = id; | |
200 | return 0; | |
201 | } | |
202 | ||
ed50a089 | 203 | static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave) |
1fa847d7 JK |
204 | { |
205 | struct fsi_master *master = slave->master; | |
11454d6d | 206 | __be32 irq, stat; |
1fa847d7 JK |
207 | int rc, link; |
208 | uint8_t id; | |
209 | ||
210 | link = slave->link; | |
211 | id = slave->id; | |
212 | ||
213 | rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC, | |
214 | &irq, sizeof(irq)); | |
215 | if (rc) | |
216 | return rc; | |
217 | ||
218 | rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT, | |
219 | &stat, sizeof(stat)); | |
220 | if (rc) | |
221 | return rc; | |
222 | ||
638bd9ac | 223 | dev_dbg(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n", |
1fa847d7 JK |
224 | be32_to_cpu(stat), be32_to_cpu(irq)); |
225 | ||
226 | /* clear interrupts */ | |
227 | return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC, | |
228 | &irq, sizeof(irq)); | |
229 | } | |
230 | ||
935f9636 BH |
231 | /* Encode slave local bus echo delay */ |
232 | static inline uint32_t fsi_smode_echodly(int x) | |
233 | { | |
234 | return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; | |
235 | } | |
236 | ||
237 | /* Encode slave local bus send delay */ | |
238 | static inline uint32_t fsi_smode_senddly(int x) | |
239 | { | |
240 | return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; | |
241 | } | |
242 | ||
243 | /* Encode slave local bus clock rate ratio */ | |
244 | static inline uint32_t fsi_smode_lbcrr(int x) | |
245 | { | |
246 | return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; | |
247 | } | |
248 | ||
249 | /* Encode slave ID */ | |
250 | static inline uint32_t fsi_smode_sid(int x) | |
251 | { | |
252 | return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; | |
253 | } | |
254 | ||
a2e7da86 | 255 | static uint32_t fsi_slave_smode(int id, u8 t_senddly, u8 t_echodly) |
935f9636 BH |
256 | { |
257 | return FSI_SMODE_WSC | FSI_SMODE_ECRC | |
258 | | fsi_smode_sid(id) | |
a2e7da86 | 259 | | fsi_smode_echodly(t_echodly - 1) | fsi_smode_senddly(t_senddly - 1) |
935f9636 BH |
260 | | fsi_smode_lbcrr(0x8); |
261 | } | |
262 | ||
a2e7da86 | 263 | static int fsi_slave_set_smode(struct fsi_slave *slave) |
935f9636 BH |
264 | { |
265 | uint32_t smode; | |
266 | __be32 data; | |
267 | ||
268 | /* set our smode register with the slave ID field to 0; this enables | |
269 | * extended slave addressing | |
270 | */ | |
a2e7da86 | 271 | smode = fsi_slave_smode(slave->id, slave->t_send_delay, slave->t_echo_delay); |
935f9636 BH |
272 | data = cpu_to_be32(smode); |
273 | ||
a2e7da86 BH |
274 | return fsi_master_write(slave->master, slave->link, slave->id, |
275 | FSI_SLAVE_BASE + FSI_SMODE, | |
276 | &data, sizeof(data)); | |
935f9636 | 277 | } |
1fa847d7 | 278 | |
ed50a089 CIK |
279 | static int fsi_slave_handle_error(struct fsi_slave *slave, bool write, |
280 | uint32_t addr, size_t size) | |
1fa847d7 JK |
281 | { |
282 | struct fsi_master *master = slave->master; | |
283 | int rc, link; | |
284 | uint32_t reg; | |
a2e7da86 | 285 | uint8_t id, send_delay, echo_delay; |
1fa847d7 JK |
286 | |
287 | if (discard_errors) | |
288 | return -1; | |
289 | ||
290 | link = slave->link; | |
291 | id = slave->id; | |
292 | ||
293 | dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]", | |
294 | write ? "write" : "read", addr, size); | |
295 | ||
296 | /* try a simple clear of error conditions, which may fail if we've lost | |
297 | * communication with the slave | |
298 | */ | |
299 | rc = fsi_slave_report_and_clear_errors(slave); | |
300 | if (!rc) | |
301 | return 0; | |
302 | ||
303 | /* send a TERM and retry */ | |
304 | if (master->term) { | |
305 | rc = master->term(master, link, id); | |
306 | if (!rc) { | |
307 | rc = fsi_master_read(master, link, id, 0, | |
308 | ®, sizeof(reg)); | |
309 | if (!rc) | |
310 | rc = fsi_slave_report_and_clear_errors(slave); | |
311 | if (!rc) | |
312 | return 0; | |
313 | } | |
314 | } | |
315 | ||
a2e7da86 BH |
316 | send_delay = slave->t_send_delay; |
317 | echo_delay = slave->t_echo_delay; | |
318 | ||
1fa847d7 JK |
319 | /* getting serious, reset the slave via BREAK */ |
320 | rc = fsi_master_break(master, link); | |
321 | if (rc) | |
322 | return rc; | |
323 | ||
a2e7da86 BH |
324 | slave->t_send_delay = send_delay; |
325 | slave->t_echo_delay = echo_delay; | |
326 | ||
327 | rc = fsi_slave_set_smode(slave); | |
1fa847d7 JK |
328 | if (rc) |
329 | return rc; | |
330 | ||
a2e7da86 BH |
331 | if (master->link_config) |
332 | master->link_config(master, link, | |
333 | slave->t_send_delay, | |
334 | slave->t_echo_delay); | |
335 | ||
1fa847d7 JK |
336 | return fsi_slave_report_and_clear_errors(slave); |
337 | } | |
338 | ||
da36cadf | 339 | int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, |
014c2abc JK |
340 | void *val, size_t size) |
341 | { | |
342 | uint8_t id = slave->id; | |
1fa847d7 | 343 | int rc, err_rc, i; |
014c2abc JK |
344 | |
345 | rc = fsi_slave_calc_addr(slave, &addr, &id); | |
346 | if (rc) | |
347 | return rc; | |
348 | ||
1fa847d7 JK |
349 | for (i = 0; i < slave_retries; i++) { |
350 | rc = fsi_master_read(slave->master, slave->link, | |
351 | id, addr, val, size); | |
352 | if (!rc) | |
353 | break; | |
354 | ||
355 | err_rc = fsi_slave_handle_error(slave, false, addr, size); | |
356 | if (err_rc) | |
357 | break; | |
358 | } | |
359 | ||
360 | return rc; | |
014c2abc | 361 | } |
da36cadf | 362 | EXPORT_SYMBOL_GPL(fsi_slave_read); |
014c2abc | 363 | |
da36cadf | 364 | int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, |
014c2abc JK |
365 | const void *val, size_t size) |
366 | { | |
367 | uint8_t id = slave->id; | |
1fa847d7 | 368 | int rc, err_rc, i; |
014c2abc JK |
369 | |
370 | rc = fsi_slave_calc_addr(slave, &addr, &id); | |
371 | if (rc) | |
372 | return rc; | |
373 | ||
1fa847d7 JK |
374 | for (i = 0; i < slave_retries; i++) { |
375 | rc = fsi_master_write(slave->master, slave->link, | |
376 | id, addr, val, size); | |
377 | if (!rc) | |
378 | break; | |
379 | ||
380 | err_rc = fsi_slave_handle_error(slave, true, addr, size); | |
381 | if (err_rc) | |
382 | break; | |
383 | } | |
384 | ||
385 | return rc; | |
014c2abc | 386 | } |
da36cadf JK |
387 | EXPORT_SYMBOL_GPL(fsi_slave_write); |
388 | ||
389 | extern int fsi_slave_claim_range(struct fsi_slave *slave, | |
390 | uint32_t addr, uint32_t size) | |
391 | { | |
392 | if (addr + size < addr) | |
393 | return -EINVAL; | |
394 | ||
395 | if (addr + size > slave->size) | |
396 | return -EINVAL; | |
397 | ||
398 | /* todo: check for overlapping claims */ | |
399 | return 0; | |
400 | } | |
401 | EXPORT_SYMBOL_GPL(fsi_slave_claim_range); | |
402 | ||
403 | extern void fsi_slave_release_range(struct fsi_slave *slave, | |
404 | uint32_t addr, uint32_t size) | |
405 | { | |
406 | } | |
407 | EXPORT_SYMBOL_GPL(fsi_slave_release_range); | |
014c2abc | 408 | |
f6a2f8eb JK |
409 | static bool fsi_device_node_matches(struct device *dev, struct device_node *np, |
410 | uint32_t addr, uint32_t size) | |
411 | { | |
412 | unsigned int len, na, ns; | |
413 | const __be32 *prop; | |
414 | uint32_t psize; | |
415 | ||
416 | na = of_n_addr_cells(np); | |
417 | ns = of_n_size_cells(np); | |
418 | ||
419 | if (na != 1 || ns != 1) | |
420 | return false; | |
421 | ||
422 | prop = of_get_property(np, "reg", &len); | |
423 | if (!prop || len != 8) | |
424 | return false; | |
425 | ||
426 | if (of_read_number(prop, 1) != addr) | |
427 | return false; | |
428 | ||
429 | psize = of_read_number(prop + 1, 1); | |
430 | if (psize != size) { | |
431 | dev_warn(dev, | |
432 | "node %s matches probed address, but not size (got 0x%x, expected 0x%x)", | |
433 | of_node_full_name(np), psize, size); | |
434 | } | |
435 | ||
436 | return true; | |
437 | } | |
438 | ||
439 | /* Find a matching node for the slave engine at @address, using @size bytes | |
440 | * of space. Returns NULL if not found, or a matching node with refcount | |
441 | * already incremented. | |
442 | */ | |
443 | static struct device_node *fsi_device_find_of_node(struct fsi_device *dev) | |
444 | { | |
445 | struct device_node *parent, *np; | |
446 | ||
447 | parent = dev_of_node(&dev->slave->dev); | |
448 | if (!parent) | |
449 | return NULL; | |
450 | ||
451 | for_each_child_of_node(parent, np) { | |
452 | if (fsi_device_node_matches(&dev->dev, np, | |
453 | dev->addr, dev->size)) | |
454 | return np; | |
455 | } | |
456 | ||
457 | return NULL; | |
458 | } | |
459 | ||
f7ade2a6 JK |
460 | static int fsi_slave_scan(struct fsi_slave *slave) |
461 | { | |
462 | uint32_t engine_addr; | |
f7ade2a6 JK |
463 | int rc, i; |
464 | ||
465 | /* | |
466 | * scan engines | |
467 | * | |
468 | * We keep the peek mode and slave engines for the core; so start | |
469 | * at the third slot in the configuration table. We also need to | |
470 | * skip the chip ID entry at the start of the address space. | |
471 | */ | |
472 | engine_addr = engine_page_size * 3; | |
473 | for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { | |
474 | uint8_t slots, version, type, crc; | |
475 | struct fsi_device *dev; | |
11454d6d JS |
476 | uint32_t conf; |
477 | __be32 data; | |
f7ade2a6 | 478 | |
11454d6d JS |
479 | rc = fsi_slave_read(slave, (i + 1) * sizeof(data), |
480 | &data, sizeof(data)); | |
f7ade2a6 JK |
481 | if (rc) { |
482 | dev_warn(&slave->dev, | |
483 | "error reading slave registers\n"); | |
484 | return -1; | |
485 | } | |
11454d6d | 486 | conf = be32_to_cpu(data); |
f7ade2a6 JK |
487 | |
488 | crc = crc4(0, conf, 32); | |
489 | if (crc) { | |
490 | dev_warn(&slave->dev, | |
491 | "crc error in slave register at 0x%04x\n", | |
492 | i); | |
493 | return -1; | |
494 | } | |
495 | ||
496 | slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) | |
497 | >> FSI_SLAVE_CONF_SLOTS_SHIFT; | |
498 | version = (conf & FSI_SLAVE_CONF_VERSION_MASK) | |
499 | >> FSI_SLAVE_CONF_VERSION_SHIFT; | |
500 | type = (conf & FSI_SLAVE_CONF_TYPE_MASK) | |
501 | >> FSI_SLAVE_CONF_TYPE_SHIFT; | |
502 | ||
503 | /* | |
504 | * Unused address areas are marked by a zero type value; this | |
505 | * skips the defined address areas | |
506 | */ | |
507 | if (type != 0 && slots != 0) { | |
508 | ||
509 | /* create device */ | |
510 | dev = fsi_create_device(slave); | |
511 | if (!dev) | |
512 | return -ENOMEM; | |
513 | ||
514 | dev->slave = slave; | |
515 | dev->engine_type = type; | |
516 | dev->version = version; | |
517 | dev->unit = i; | |
518 | dev->addr = engine_addr; | |
519 | dev->size = slots * engine_page_size; | |
520 | ||
521 | dev_dbg(&slave->dev, | |
522 | "engine[%i]: type %x, version %x, addr %x size %x\n", | |
523 | dev->unit, dev->engine_type, version, | |
524 | dev->addr, dev->size); | |
525 | ||
526 | dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", | |
527 | slave->master->idx, slave->link, | |
528 | slave->id, i - 2); | |
f6a2f8eb | 529 | dev->dev.of_node = fsi_device_find_of_node(dev); |
f7ade2a6 JK |
530 | |
531 | rc = device_register(&dev->dev); | |
532 | if (rc) { | |
533 | dev_warn(&slave->dev, "add failed: %d\n", rc); | |
534 | put_device(&dev->dev); | |
535 | } | |
536 | } | |
537 | ||
538 | engine_addr += slots * engine_page_size; | |
539 | ||
540 | if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) | |
541 | break; | |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
125739cb JK |
547 | static ssize_t fsi_slave_sysfs_raw_read(struct file *file, |
548 | struct kobject *kobj, struct bin_attribute *attr, char *buf, | |
549 | loff_t off, size_t count) | |
550 | { | |
551 | struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); | |
552 | size_t total_len, read_len; | |
553 | int rc; | |
554 | ||
555 | if (off < 0) | |
556 | return -EINVAL; | |
557 | ||
558 | if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) | |
559 | return -EINVAL; | |
560 | ||
561 | for (total_len = 0; total_len < count; total_len += read_len) { | |
562 | read_len = min_t(size_t, count, 4); | |
563 | read_len -= off & 0x3; | |
564 | ||
565 | rc = fsi_slave_read(slave, off, buf + total_len, read_len); | |
566 | if (rc) | |
567 | return rc; | |
568 | ||
569 | off += read_len; | |
570 | } | |
571 | ||
572 | return count; | |
573 | } | |
574 | ||
575 | static ssize_t fsi_slave_sysfs_raw_write(struct file *file, | |
576 | struct kobject *kobj, struct bin_attribute *attr, | |
577 | char *buf, loff_t off, size_t count) | |
578 | { | |
579 | struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); | |
580 | size_t total_len, write_len; | |
581 | int rc; | |
582 | ||
583 | if (off < 0) | |
584 | return -EINVAL; | |
585 | ||
586 | if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) | |
587 | return -EINVAL; | |
588 | ||
589 | for (total_len = 0; total_len < count; total_len += write_len) { | |
590 | write_len = min_t(size_t, count, 4); | |
591 | write_len -= off & 0x3; | |
592 | ||
593 | rc = fsi_slave_write(slave, off, buf + total_len, write_len); | |
594 | if (rc) | |
595 | return rc; | |
596 | ||
597 | off += write_len; | |
598 | } | |
599 | ||
600 | return count; | |
601 | } | |
602 | ||
061c0958 | 603 | static const struct bin_attribute fsi_slave_raw_attr = { |
125739cb JK |
604 | .attr = { |
605 | .name = "raw", | |
606 | .mode = 0600, | |
607 | }, | |
608 | .size = 0, | |
609 | .read = fsi_slave_sysfs_raw_read, | |
610 | .write = fsi_slave_sysfs_raw_write, | |
611 | }; | |
612 | ||
2b545cd8 JK |
613 | static void fsi_slave_release(struct device *dev) |
614 | { | |
615 | struct fsi_slave *slave = to_fsi_slave(dev); | |
616 | ||
0ab5fe53 | 617 | fsi_free_minor(slave->dev.devt); |
f6a2f8eb | 618 | of_node_put(dev->of_node); |
2b545cd8 JK |
619 | kfree(slave); |
620 | } | |
621 | ||
f6a2f8eb JK |
622 | static bool fsi_slave_node_matches(struct device_node *np, |
623 | int link, uint8_t id) | |
624 | { | |
625 | unsigned int len, na, ns; | |
626 | const __be32 *prop; | |
627 | ||
628 | na = of_n_addr_cells(np); | |
629 | ns = of_n_size_cells(np); | |
630 | ||
631 | /* Ensure we have the correct format for addresses and sizes in | |
632 | * reg properties | |
633 | */ | |
634 | if (na != 2 || ns != 0) | |
635 | return false; | |
636 | ||
637 | prop = of_get_property(np, "reg", &len); | |
638 | if (!prop || len != 8) | |
639 | return false; | |
640 | ||
641 | return (of_read_number(prop, 1) == link) && | |
642 | (of_read_number(prop + 1, 1) == id); | |
643 | } | |
644 | ||
645 | /* Find a matching node for the slave at (link, id). Returns NULL if none | |
646 | * found, or a matching node with refcount already incremented. | |
647 | */ | |
648 | static struct device_node *fsi_slave_find_of_node(struct fsi_master *master, | |
649 | int link, uint8_t id) | |
650 | { | |
651 | struct device_node *parent, *np; | |
652 | ||
653 | parent = dev_of_node(&master->dev); | |
654 | if (!parent) | |
655 | return NULL; | |
656 | ||
657 | for_each_child_of_node(parent, np) { | |
658 | if (fsi_slave_node_matches(np, link, id)) | |
659 | return np; | |
660 | } | |
661 | ||
662 | return NULL; | |
663 | } | |
664 | ||
d1dcd678 BH |
665 | static ssize_t cfam_read(struct file *filep, char __user *buf, size_t count, |
666 | loff_t *offset) | |
667 | { | |
668 | struct fsi_slave *slave = filep->private_data; | |
669 | size_t total_len, read_len; | |
670 | loff_t off = *offset; | |
671 | ssize_t rc; | |
672 | ||
673 | if (off < 0) | |
674 | return -EINVAL; | |
675 | ||
676 | if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) | |
677 | return -EINVAL; | |
678 | ||
679 | for (total_len = 0; total_len < count; total_len += read_len) { | |
680 | __be32 data; | |
681 | ||
682 | read_len = min_t(size_t, count, 4); | |
683 | read_len -= off & 0x3; | |
684 | ||
685 | rc = fsi_slave_read(slave, off, &data, read_len); | |
686 | if (rc) | |
687 | goto fail; | |
688 | rc = copy_to_user(buf + total_len, &data, read_len); | |
689 | if (rc) { | |
690 | rc = -EFAULT; | |
691 | goto fail; | |
692 | } | |
693 | off += read_len; | |
694 | } | |
695 | rc = count; | |
696 | fail: | |
697 | *offset = off; | |
698 | return count; | |
699 | } | |
700 | ||
701 | static ssize_t cfam_write(struct file *filep, const char __user *buf, | |
702 | size_t count, loff_t *offset) | |
703 | { | |
704 | struct fsi_slave *slave = filep->private_data; | |
705 | size_t total_len, write_len; | |
706 | loff_t off = *offset; | |
707 | ssize_t rc; | |
708 | ||
709 | ||
710 | if (off < 0) | |
711 | return -EINVAL; | |
712 | ||
713 | if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) | |
714 | return -EINVAL; | |
715 | ||
716 | for (total_len = 0; total_len < count; total_len += write_len) { | |
717 | __be32 data; | |
718 | ||
719 | write_len = min_t(size_t, count, 4); | |
720 | write_len -= off & 0x3; | |
721 | ||
722 | rc = copy_from_user(&data, buf + total_len, write_len); | |
723 | if (rc) { | |
724 | rc = -EFAULT; | |
725 | goto fail; | |
726 | } | |
727 | rc = fsi_slave_write(slave, off, &data, write_len); | |
728 | if (rc) | |
729 | goto fail; | |
730 | off += write_len; | |
731 | } | |
732 | rc = count; | |
733 | fail: | |
734 | *offset = off; | |
735 | return count; | |
736 | } | |
737 | ||
738 | static loff_t cfam_llseek(struct file *file, loff_t offset, int whence) | |
739 | { | |
740 | switch (whence) { | |
741 | case SEEK_CUR: | |
742 | break; | |
743 | case SEEK_SET: | |
744 | file->f_pos = offset; | |
745 | break; | |
746 | default: | |
747 | return -EINVAL; | |
748 | } | |
749 | ||
750 | return offset; | |
751 | } | |
752 | ||
753 | static int cfam_open(struct inode *inode, struct file *file) | |
754 | { | |
755 | struct fsi_slave *slave = container_of(inode->i_cdev, struct fsi_slave, cdev); | |
756 | ||
757 | file->private_data = slave; | |
758 | ||
759 | return 0; | |
760 | } | |
761 | ||
762 | static const struct file_operations cfam_fops = { | |
763 | .owner = THIS_MODULE, | |
764 | .open = cfam_open, | |
765 | .llseek = cfam_llseek, | |
766 | .read = cfam_read, | |
767 | .write = cfam_write, | |
768 | }; | |
769 | ||
770 | static ssize_t send_term_store(struct device *dev, | |
771 | struct device_attribute *attr, | |
772 | const char *buf, size_t count) | |
773 | { | |
774 | struct fsi_slave *slave = to_fsi_slave(dev); | |
775 | struct fsi_master *master = slave->master; | |
776 | ||
777 | if (!master->term) | |
778 | return -ENODEV; | |
779 | ||
780 | master->term(master, slave->link, slave->id); | |
781 | return count; | |
782 | } | |
783 | ||
784 | static DEVICE_ATTR_WO(send_term); | |
785 | ||
a2e7da86 BH |
786 | static ssize_t slave_send_echo_show(struct device *dev, |
787 | struct device_attribute *attr, | |
788 | char *buf) | |
789 | { | |
790 | struct fsi_slave *slave = to_fsi_slave(dev); | |
791 | ||
792 | return sprintf(buf, "%u\n", slave->t_send_delay); | |
793 | } | |
794 | ||
795 | static ssize_t slave_send_echo_store(struct device *dev, | |
796 | struct device_attribute *attr, const char *buf, size_t count) | |
797 | { | |
798 | struct fsi_slave *slave = to_fsi_slave(dev); | |
799 | struct fsi_master *master = slave->master; | |
800 | unsigned long val; | |
801 | int rc; | |
802 | ||
803 | if (kstrtoul(buf, 0, &val) < 0) | |
804 | return -EINVAL; | |
805 | ||
806 | if (val < 1 || val > 16) | |
807 | return -EINVAL; | |
808 | ||
809 | if (!master->link_config) | |
810 | return -ENXIO; | |
811 | ||
812 | /* Current HW mandates that send and echo delay are identical */ | |
813 | slave->t_send_delay = val; | |
814 | slave->t_echo_delay = val; | |
815 | ||
816 | rc = fsi_slave_set_smode(slave); | |
817 | if (rc < 0) | |
818 | return rc; | |
819 | if (master->link_config) | |
820 | master->link_config(master, slave->link, | |
821 | slave->t_send_delay, | |
822 | slave->t_echo_delay); | |
823 | ||
824 | return count; | |
825 | } | |
826 | ||
827 | static DEVICE_ATTR(send_echo_delays, 0600, | |
828 | slave_send_echo_show, slave_send_echo_store); | |
829 | ||
0a213777 BH |
830 | static ssize_t chip_id_show(struct device *dev, |
831 | struct device_attribute *attr, | |
832 | char *buf) | |
833 | { | |
834 | struct fsi_slave *slave = to_fsi_slave(dev); | |
835 | ||
836 | return sprintf(buf, "%d\n", slave->chip_id); | |
837 | } | |
838 | ||
839 | static DEVICE_ATTR_RO(chip_id); | |
840 | ||
d1dcd678 BH |
841 | static ssize_t cfam_id_show(struct device *dev, |
842 | struct device_attribute *attr, | |
843 | char *buf) | |
844 | { | |
845 | struct fsi_slave *slave = to_fsi_slave(dev); | |
846 | ||
847 | return sprintf(buf, "0x%x\n", slave->cfam_id); | |
848 | } | |
849 | ||
850 | static DEVICE_ATTR_RO(cfam_id); | |
851 | ||
852 | static struct attribute *cfam_attr[] = { | |
853 | &dev_attr_send_echo_delays.attr, | |
854 | &dev_attr_chip_id.attr, | |
855 | &dev_attr_cfam_id.attr, | |
856 | &dev_attr_send_term.attr, | |
857 | NULL, | |
858 | }; | |
859 | ||
860 | static const struct attribute_group cfam_attr_group = { | |
861 | .attrs = cfam_attr, | |
862 | }; | |
863 | ||
864 | static const struct attribute_group *cfam_attr_groups[] = { | |
865 | &cfam_attr_group, | |
866 | NULL, | |
867 | }; | |
868 | ||
869 | static char *cfam_devnode(struct device *dev, umode_t *mode, | |
870 | kuid_t *uid, kgid_t *gid) | |
871 | { | |
872 | struct fsi_slave *slave = to_fsi_slave(dev); | |
873 | ||
874 | #ifdef CONFIG_FSI_NEW_DEV_NODE | |
875 | return kasprintf(GFP_KERNEL, "fsi/cfam%d", slave->cdev_idx); | |
876 | #else | |
877 | return kasprintf(GFP_KERNEL, "cfam%d", slave->cdev_idx); | |
878 | #endif | |
879 | } | |
880 | ||
881 | static const struct device_type cfam_type = { | |
882 | .name = "cfam", | |
883 | .devnode = cfam_devnode, | |
884 | .groups = cfam_attr_groups | |
885 | }; | |
886 | ||
0ab5fe53 BH |
887 | static char *fsi_cdev_devnode(struct device *dev, umode_t *mode, |
888 | kuid_t *uid, kgid_t *gid) | |
889 | { | |
890 | #ifdef CONFIG_FSI_NEW_DEV_NODE | |
891 | return kasprintf(GFP_KERNEL, "fsi/%s", dev_name(dev)); | |
892 | #else | |
893 | return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); | |
894 | #endif | |
895 | } | |
896 | ||
897 | const struct device_type fsi_cdev_type = { | |
898 | .name = "fsi-cdev", | |
899 | .devnode = fsi_cdev_devnode, | |
900 | }; | |
901 | EXPORT_SYMBOL_GPL(fsi_cdev_type); | |
902 | ||
903 | /* Backward compatible /dev/ numbering in "old style" mode */ | |
904 | static int fsi_adjust_index(int index) | |
905 | { | |
906 | #ifdef CONFIG_FSI_NEW_DEV_NODE | |
907 | return index; | |
908 | #else | |
909 | return index + 1; | |
910 | #endif | |
911 | } | |
912 | ||
913 | static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type, | |
914 | dev_t *out_dev, int *out_index) | |
915 | { | |
916 | int cid = slave->chip_id; | |
917 | int id; | |
918 | ||
919 | /* Check if we qualify for legacy numbering */ | |
920 | if (cid >= 0 && cid < 16 && type < 4) { | |
921 | /* Try reserving the legacy number */ | |
922 | id = (cid << 4) | type; | |
923 | id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL); | |
924 | if (id >= 0) { | |
925 | *out_index = fsi_adjust_index(cid); | |
926 | *out_dev = fsi_base_dev + id; | |
927 | return 0; | |
928 | } | |
929 | /* Other failure */ | |
930 | if (id != -ENOSPC) | |
931 | return id; | |
932 | /* Fallback to non-legacy allocation */ | |
933 | } | |
934 | id = ida_simple_get(&fsi_minor_ida, FSI_CHAR_LEGACY_TOP, | |
935 | FSI_CHAR_MAX_DEVICES, GFP_KERNEL); | |
936 | if (id < 0) | |
937 | return id; | |
938 | *out_index = fsi_adjust_index(id); | |
939 | *out_dev = fsi_base_dev + id; | |
940 | return 0; | |
941 | } | |
942 | ||
943 | int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type, | |
944 | dev_t *out_dev, int *out_index) | |
945 | { | |
946 | return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index); | |
947 | } | |
948 | EXPORT_SYMBOL_GPL(fsi_get_new_minor); | |
949 | ||
950 | void fsi_free_minor(dev_t dev) | |
951 | { | |
952 | ida_simple_remove(&fsi_minor_ida, MINOR(dev)); | |
953 | } | |
954 | EXPORT_SYMBOL_GPL(fsi_free_minor); | |
955 | ||
414c1026 JK |
956 | static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) |
957 | { | |
d1dcd678 | 958 | uint32_t cfam_id; |
2b545cd8 | 959 | struct fsi_slave *slave; |
2b545cd8 | 960 | uint8_t crc; |
11454d6d | 961 | __be32 data, llmode; |
2b545cd8 JK |
962 | int rc; |
963 | ||
964 | /* Currently, we only support single slaves on a link, and use the | |
965 | * full 23-bit address range | |
966 | */ | |
967 | if (id != 0) | |
968 | return -EINVAL; | |
969 | ||
11454d6d | 970 | rc = fsi_master_read(master, link, id, 0, &data, sizeof(data)); |
2b545cd8 JK |
971 | if (rc) { |
972 | dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", | |
973 | link, id, rc); | |
974 | return -ENODEV; | |
975 | } | |
d1dcd678 | 976 | cfam_id = be32_to_cpu(data); |
2b545cd8 | 977 | |
d1dcd678 | 978 | crc = crc4(0, cfam_id, 32); |
2b545cd8 | 979 | if (crc) { |
d1dcd678 | 980 | dev_warn(&master->dev, "slave %02x:%02x invalid cfam id CRC!\n", |
2b545cd8 JK |
981 | link, id); |
982 | return -EIO; | |
983 | } | |
984 | ||
638bd9ac | 985 | dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", |
d1dcd678 | 986 | cfam_id, master->idx, link, id); |
2b545cd8 | 987 | |
4af889b0 JK |
988 | /* If we're behind a master that doesn't provide a self-running bus |
989 | * clock, put the slave into async mode | |
990 | */ | |
991 | if (master->flags & FSI_MASTER_FLAG_SWCLOCK) { | |
992 | llmode = cpu_to_be32(FSI_LLMODE_ASYNC); | |
993 | rc = fsi_master_write(master, link, id, | |
994 | FSI_SLAVE_BASE + FSI_LLMODE, | |
995 | &llmode, sizeof(llmode)); | |
996 | if (rc) | |
997 | dev_warn(&master->dev, | |
998 | "can't set llmode on slave:%02x:%02x %d\n", | |
999 | link, id, rc); | |
1000 | } | |
1001 | ||
2b545cd8 JK |
1002 | /* We can communicate with a slave; create the slave device and |
1003 | * register. | |
1004 | */ | |
1005 | slave = kzalloc(sizeof(*slave), GFP_KERNEL); | |
1006 | if (!slave) | |
1007 | return -ENOMEM; | |
1008 | ||
d1dcd678 BH |
1009 | dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); |
1010 | slave->dev.type = &cfam_type; | |
2b545cd8 | 1011 | slave->dev.parent = &master->dev; |
f6a2f8eb | 1012 | slave->dev.of_node = fsi_slave_find_of_node(master, link, id); |
2b545cd8 | 1013 | slave->dev.release = fsi_slave_release; |
d1dcd678 BH |
1014 | device_initialize(&slave->dev); |
1015 | slave->cfam_id = cfam_id; | |
1016 | slave->master = master; | |
2b545cd8 JK |
1017 | slave->link = link; |
1018 | slave->id = id; | |
1019 | slave->size = FSI_SLAVE_SIZE_23b; | |
a2e7da86 BH |
1020 | slave->t_send_delay = 16; |
1021 | slave->t_echo_delay = 16; | |
1022 | ||
0a213777 BH |
1023 | /* Get chip ID if any */ |
1024 | slave->chip_id = -1; | |
1025 | if (slave->dev.of_node) { | |
1026 | uint32_t prop; | |
1027 | if (!of_property_read_u32(slave->dev.of_node, "chip-id", &prop)) | |
1028 | slave->chip_id = prop; | |
1029 | ||
1030 | } | |
d1dcd678 | 1031 | |
371975b0 JK |
1032 | rc = fsi_slave_set_smode(slave); |
1033 | if (rc) { | |
1034 | dev_warn(&master->dev, | |
1035 | "can't set smode on slave:%02x:%02x %d\n", | |
1036 | link, id, rc); | |
1037 | goto err_free; | |
1038 | } | |
1039 | ||
d1dcd678 BH |
1040 | /* Allocate a minor in the FSI space */ |
1041 | rc = __fsi_get_new_minor(slave, fsi_dev_cfam, &slave->dev.devt, | |
1042 | &slave->cdev_idx); | |
1043 | if (rc) | |
1044 | goto err_free; | |
1045 | ||
1046 | /* Create chardev for userspace access */ | |
1047 | cdev_init(&slave->cdev, &cfam_fops); | |
1048 | rc = cdev_device_add(&slave->cdev, &slave->dev); | |
1049 | if (rc) { | |
1050 | dev_err(&slave->dev, "Error %d creating slave device\n", rc); | |
371975b0 | 1051 | goto err_free_ida; |
d1dcd678 BH |
1052 | } |
1053 | ||
371975b0 JK |
1054 | /* Now that we have the cdev registered with the core, any fatal |
1055 | * failures beyond this point will need to clean up through | |
1056 | * cdev_device_del(). Fortunately though, nothing past here is fatal. | |
1057 | */ | |
1058 | ||
a2e7da86 BH |
1059 | if (master->link_config) |
1060 | master->link_config(master, link, | |
1061 | slave->t_send_delay, | |
1062 | slave->t_echo_delay); | |
2b545cd8 | 1063 | |
d1dcd678 | 1064 | /* Legacy raw file -> to be removed */ |
125739cb JK |
1065 | rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); |
1066 | if (rc) | |
1067 | dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); | |
1068 | ||
0a213777 | 1069 | |
f7ade2a6 JK |
1070 | rc = fsi_slave_scan(slave); |
1071 | if (rc) | |
1072 | dev_dbg(&master->dev, "failed during slave scan with: %d\n", | |
1073 | rc); | |
414c1026 | 1074 | |
371975b0 | 1075 | return 0; |
d1dcd678 | 1076 | |
371975b0 JK |
1077 | err_free_ida: |
1078 | fsi_free_minor(slave->dev.devt); | |
1079 | err_free: | |
1080 | of_node_put(slave->dev.of_node); | |
1081 | kfree(slave); | |
d1dcd678 | 1082 | return rc; |
414c1026 JK |
1083 | } |
1084 | ||
09aecfab | 1085 | /* FSI master support */ |
014c2abc JK |
1086 | static int fsi_check_access(uint32_t addr, size_t size) |
1087 | { | |
99f039e9 EJ |
1088 | if (size == 4) { |
1089 | if (addr & 0x3) | |
1090 | return -EINVAL; | |
1091 | } else if (size == 2) { | |
1092 | if (addr & 0x1) | |
1093 | return -EINVAL; | |
1094 | } else if (size != 1) | |
014c2abc JK |
1095 | return -EINVAL; |
1096 | ||
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | static int fsi_master_read(struct fsi_master *master, int link, | |
1101 | uint8_t slave_id, uint32_t addr, void *val, size_t size) | |
1102 | { | |
1103 | int rc; | |
1104 | ||
66433b05 JK |
1105 | trace_fsi_master_read(master, link, slave_id, addr, size); |
1106 | ||
014c2abc | 1107 | rc = fsi_check_access(addr, size); |
66433b05 JK |
1108 | if (!rc) |
1109 | rc = master->read(master, link, slave_id, addr, val, size); | |
1110 | ||
1111 | trace_fsi_master_rw_result(master, link, slave_id, addr, size, | |
1112 | false, val, rc); | |
014c2abc | 1113 | |
66433b05 | 1114 | return rc; |
014c2abc JK |
1115 | } |
1116 | ||
1117 | static int fsi_master_write(struct fsi_master *master, int link, | |
1118 | uint8_t slave_id, uint32_t addr, const void *val, size_t size) | |
1119 | { | |
1120 | int rc; | |
1121 | ||
66433b05 JK |
1122 | trace_fsi_master_write(master, link, slave_id, addr, size, val); |
1123 | ||
014c2abc | 1124 | rc = fsi_check_access(addr, size); |
66433b05 JK |
1125 | if (!rc) |
1126 | rc = master->write(master, link, slave_id, addr, val, size); | |
014c2abc | 1127 | |
66433b05 JK |
1128 | trace_fsi_master_rw_result(master, link, slave_id, addr, size, |
1129 | true, val, rc); | |
1130 | ||
1131 | return rc; | |
014c2abc JK |
1132 | } |
1133 | ||
26095282 CB |
1134 | static int fsi_master_link_enable(struct fsi_master *master, int link) |
1135 | { | |
1136 | if (master->link_enable) | |
1137 | return master->link_enable(master, link); | |
1138 | ||
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * Issue a break command on this link | |
1144 | */ | |
1145 | static int fsi_master_break(struct fsi_master *master, int link) | |
1146 | { | |
a2e7da86 BH |
1147 | int rc = 0; |
1148 | ||
66433b05 JK |
1149 | trace_fsi_master_break(master, link); |
1150 | ||
26095282 | 1151 | if (master->send_break) |
a2e7da86 BH |
1152 | rc = master->send_break(master, link); |
1153 | if (master->link_config) | |
1154 | master->link_config(master, link, 16, 16); | |
26095282 | 1155 | |
a2e7da86 | 1156 | return rc; |
26095282 CB |
1157 | } |
1158 | ||
414c1026 JK |
1159 | static int fsi_master_scan(struct fsi_master *master) |
1160 | { | |
26095282 CB |
1161 | int link, rc; |
1162 | ||
1163 | for (link = 0; link < master->n_links; link++) { | |
1164 | rc = fsi_master_link_enable(master, link); | |
1165 | if (rc) { | |
1166 | dev_dbg(&master->dev, | |
1167 | "enable link %d failed: %d\n", link, rc); | |
1168 | continue; | |
1169 | } | |
1170 | rc = fsi_master_break(master, link); | |
1171 | if (rc) { | |
1172 | dev_dbg(&master->dev, | |
1173 | "break to link %d failed: %d\n", link, rc); | |
1174 | continue; | |
1175 | } | |
414c1026 | 1176 | |
414c1026 | 1177 | fsi_slave_init(master, link, 0); |
26095282 | 1178 | } |
414c1026 JK |
1179 | |
1180 | return 0; | |
1181 | } | |
1182 | ||
cd0fdb5c CB |
1183 | static int fsi_slave_remove_device(struct device *dev, void *arg) |
1184 | { | |
1185 | device_unregister(dev); | |
1186 | return 0; | |
1187 | } | |
1188 | ||
1189 | static int fsi_master_remove_slave(struct device *dev, void *arg) | |
1190 | { | |
d1dcd678 BH |
1191 | struct fsi_slave *slave = to_fsi_slave(dev); |
1192 | ||
cd0fdb5c | 1193 | device_for_each_child(dev, NULL, fsi_slave_remove_device); |
d1dcd678 | 1194 | cdev_device_del(&slave->cdev, &slave->dev); |
0ab5fe53 | 1195 | put_device(dev); |
cd0fdb5c CB |
1196 | return 0; |
1197 | } | |
1198 | ||
1199 | static void fsi_master_unscan(struct fsi_master *master) | |
1200 | { | |
1201 | device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); | |
1202 | } | |
1203 | ||
15362d69 JK |
1204 | int fsi_master_rescan(struct fsi_master *master) |
1205 | { | |
9840fcd8 BH |
1206 | int rc; |
1207 | ||
1208 | mutex_lock(&master->scan_lock); | |
15362d69 | 1209 | fsi_master_unscan(master); |
9840fcd8 BH |
1210 | rc = fsi_master_scan(master); |
1211 | mutex_unlock(&master->scan_lock); | |
1212 | ||
1213 | return rc; | |
15362d69 JK |
1214 | } |
1215 | EXPORT_SYMBOL_GPL(fsi_master_rescan); | |
1216 | ||
cd0fdb5c CB |
1217 | static ssize_t master_rescan_store(struct device *dev, |
1218 | struct device_attribute *attr, const char *buf, size_t count) | |
1219 | { | |
1220 | struct fsi_master *master = to_fsi_master(dev); | |
1221 | int rc; | |
1222 | ||
15362d69 | 1223 | rc = fsi_master_rescan(master); |
cd0fdb5c CB |
1224 | if (rc < 0) |
1225 | return rc; | |
1226 | ||
1227 | return count; | |
1228 | } | |
1229 | ||
1230 | static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); | |
1231 | ||
125739cb JK |
1232 | static ssize_t master_break_store(struct device *dev, |
1233 | struct device_attribute *attr, const char *buf, size_t count) | |
1234 | { | |
1235 | struct fsi_master *master = to_fsi_master(dev); | |
1236 | ||
1237 | fsi_master_break(master, 0); | |
1238 | ||
1239 | return count; | |
1240 | } | |
1241 | ||
1242 | static DEVICE_ATTR(break, 0200, NULL, master_break_store); | |
1243 | ||
09aecfab JK |
1244 | int fsi_master_register(struct fsi_master *master) |
1245 | { | |
1246 | int rc; | |
f3aa2c6f | 1247 | struct device_node *np; |
09aecfab | 1248 | |
9840fcd8 | 1249 | mutex_init(&master->scan_lock); |
09aecfab JK |
1250 | master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); |
1251 | dev_set_name(&master->dev, "fsi%d", master->idx); | |
1252 | ||
1253 | rc = device_register(&master->dev); | |
414c1026 | 1254 | if (rc) { |
09aecfab | 1255 | ida_simple_remove(&master_ida, master->idx); |
414c1026 JK |
1256 | return rc; |
1257 | } | |
09aecfab | 1258 | |
cd0fdb5c CB |
1259 | rc = device_create_file(&master->dev, &dev_attr_rescan); |
1260 | if (rc) { | |
265aac26 | 1261 | device_del(&master->dev); |
cd0fdb5c CB |
1262 | ida_simple_remove(&master_ida, master->idx); |
1263 | return rc; | |
1264 | } | |
1265 | ||
125739cb JK |
1266 | rc = device_create_file(&master->dev, &dev_attr_break); |
1267 | if (rc) { | |
265aac26 | 1268 | device_del(&master->dev); |
125739cb JK |
1269 | ida_simple_remove(&master_ida, master->idx); |
1270 | return rc; | |
1271 | } | |
1272 | ||
f3aa2c6f | 1273 | np = dev_of_node(&master->dev); |
9840fcd8 BH |
1274 | if (!of_property_read_bool(np, "no-scan-on-init")) { |
1275 | mutex_lock(&master->scan_lock); | |
f3aa2c6f | 1276 | fsi_master_scan(master); |
9840fcd8 BH |
1277 | mutex_unlock(&master->scan_lock); |
1278 | } | |
cd0fdb5c | 1279 | |
414c1026 | 1280 | return 0; |
09aecfab JK |
1281 | } |
1282 | EXPORT_SYMBOL_GPL(fsi_master_register); | |
1283 | ||
1284 | void fsi_master_unregister(struct fsi_master *master) | |
1285 | { | |
1286 | if (master->idx >= 0) { | |
1287 | ida_simple_remove(&master_ida, master->idx); | |
1288 | master->idx = -1; | |
1289 | } | |
1290 | ||
9840fcd8 | 1291 | mutex_lock(&master->scan_lock); |
cd0fdb5c | 1292 | fsi_master_unscan(master); |
9840fcd8 | 1293 | mutex_unlock(&master->scan_lock); |
09aecfab JK |
1294 | device_unregister(&master->dev); |
1295 | } | |
1296 | EXPORT_SYMBOL_GPL(fsi_master_unregister); | |
1297 | ||
0508ad1f JK |
1298 | /* FSI core & Linux bus type definitions */ |
1299 | ||
dd37eed7 JK |
1300 | static int fsi_bus_match(struct device *dev, struct device_driver *drv) |
1301 | { | |
1302 | struct fsi_device *fsi_dev = to_fsi_dev(dev); | |
1303 | struct fsi_driver *fsi_drv = to_fsi_drv(drv); | |
1304 | const struct fsi_device_id *id; | |
1305 | ||
1306 | if (!fsi_drv->id_table) | |
1307 | return 0; | |
1308 | ||
1309 | for (id = fsi_drv->id_table; id->engine_type; id++) { | |
1310 | if (id->engine_type != fsi_dev->engine_type) | |
1311 | continue; | |
1312 | if (id->version == FSI_VERSION_ANY || | |
1313 | id->version == fsi_dev->version) | |
1314 | return 1; | |
1315 | } | |
1316 | ||
1317 | return 0; | |
1318 | } | |
1319 | ||
356d8009 CB |
1320 | int fsi_driver_register(struct fsi_driver *fsi_drv) |
1321 | { | |
1322 | if (!fsi_drv) | |
1323 | return -EINVAL; | |
1324 | if (!fsi_drv->id_table) | |
1325 | return -EINVAL; | |
1326 | ||
1327 | return driver_register(&fsi_drv->drv); | |
1328 | } | |
1329 | EXPORT_SYMBOL_GPL(fsi_driver_register); | |
1330 | ||
1331 | void fsi_driver_unregister(struct fsi_driver *fsi_drv) | |
1332 | { | |
1333 | driver_unregister(&fsi_drv->drv); | |
1334 | } | |
1335 | EXPORT_SYMBOL_GPL(fsi_driver_unregister); | |
1336 | ||
0508ad1f JK |
1337 | struct bus_type fsi_bus_type = { |
1338 | .name = "fsi", | |
dd37eed7 | 1339 | .match = fsi_bus_match, |
0508ad1f JK |
1340 | }; |
1341 | EXPORT_SYMBOL_GPL(fsi_bus_type); | |
1342 | ||
496f8931 | 1343 | static int __init fsi_init(void) |
0508ad1f | 1344 | { |
0ab5fe53 BH |
1345 | int rc; |
1346 | ||
1347 | rc = alloc_chrdev_region(&fsi_base_dev, 0, FSI_CHAR_MAX_DEVICES, "fsi"); | |
1348 | if (rc) | |
1349 | return rc; | |
1350 | rc = bus_register(&fsi_bus_type); | |
1351 | if (rc) | |
1352 | goto fail_bus; | |
1353 | return 0; | |
1354 | ||
1355 | fail_bus: | |
1356 | unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); | |
1357 | return rc; | |
0508ad1f | 1358 | } |
496f8931 | 1359 | postcore_initcall(fsi_init); |
0508ad1f JK |
1360 | |
1361 | static void fsi_exit(void) | |
1362 | { | |
1363 | bus_unregister(&fsi_bus_type); | |
0ab5fe53 BH |
1364 | unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); |
1365 | ida_destroy(&fsi_minor_ida); | |
0508ad1f | 1366 | } |
0508ad1f | 1367 | module_exit(fsi_exit); |
1fa847d7 | 1368 | module_param(discard_errors, int, 0664); |
acb7e8f7 | 1369 | MODULE_LICENSE("GPL"); |
1fa847d7 | 1370 | MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); |