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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 | ||
9f4c2b51 AJ |
547 | static unsigned long aligned_access_size(size_t offset, size_t count) |
548 | { | |
549 | unsigned long offset_unit, count_unit; | |
550 | ||
551 | /* Criteria: | |
552 | * | |
553 | * 1. Access size must be less than or equal to the maximum access | |
554 | * width or the highest power-of-two factor of offset | |
555 | * 2. Access size must be less than or equal to the amount specified by | |
556 | * count | |
557 | * | |
558 | * The access width is optimal if we can calculate 1 to be strictly | |
559 | * equal while still satisfying 2. | |
560 | */ | |
561 | ||
562 | /* Find 1 by the bottom bit of offset (with a 4 byte access cap) */ | |
563 | offset_unit = BIT(__builtin_ctzl(offset | 4)); | |
564 | ||
565 | /* Find 2 by the top bit of count */ | |
566 | count_unit = BIT(8 * sizeof(unsigned long) - 1 - __builtin_clzl(count)); | |
567 | ||
568 | /* Constrain the maximum access width to the minimum of both criteria */ | |
569 | return BIT(__builtin_ctzl(offset_unit | count_unit)); | |
570 | } | |
571 | ||
125739cb JK |
572 | static ssize_t fsi_slave_sysfs_raw_read(struct file *file, |
573 | struct kobject *kobj, struct bin_attribute *attr, char *buf, | |
574 | loff_t off, size_t count) | |
575 | { | |
576 | struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); | |
577 | size_t total_len, read_len; | |
578 | int rc; | |
579 | ||
580 | if (off < 0) | |
581 | return -EINVAL; | |
582 | ||
583 | if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) | |
584 | return -EINVAL; | |
585 | ||
586 | for (total_len = 0; total_len < count; total_len += read_len) { | |
9f4c2b51 | 587 | read_len = aligned_access_size(off, count - total_len); |
125739cb JK |
588 | |
589 | rc = fsi_slave_read(slave, off, buf + total_len, read_len); | |
590 | if (rc) | |
591 | return rc; | |
592 | ||
593 | off += read_len; | |
594 | } | |
595 | ||
596 | return count; | |
597 | } | |
598 | ||
599 | static ssize_t fsi_slave_sysfs_raw_write(struct file *file, | |
600 | struct kobject *kobj, struct bin_attribute *attr, | |
601 | char *buf, loff_t off, size_t count) | |
602 | { | |
603 | struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); | |
604 | size_t total_len, write_len; | |
605 | int rc; | |
606 | ||
607 | if (off < 0) | |
608 | return -EINVAL; | |
609 | ||
610 | if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) | |
611 | return -EINVAL; | |
612 | ||
613 | for (total_len = 0; total_len < count; total_len += write_len) { | |
9f4c2b51 | 614 | write_len = aligned_access_size(off, count - total_len); |
125739cb JK |
615 | |
616 | rc = fsi_slave_write(slave, off, buf + total_len, write_len); | |
617 | if (rc) | |
618 | return rc; | |
619 | ||
620 | off += write_len; | |
621 | } | |
622 | ||
623 | return count; | |
624 | } | |
625 | ||
061c0958 | 626 | static const struct bin_attribute fsi_slave_raw_attr = { |
125739cb JK |
627 | .attr = { |
628 | .name = "raw", | |
629 | .mode = 0600, | |
630 | }, | |
631 | .size = 0, | |
632 | .read = fsi_slave_sysfs_raw_read, | |
633 | .write = fsi_slave_sysfs_raw_write, | |
634 | }; | |
635 | ||
2b545cd8 JK |
636 | static void fsi_slave_release(struct device *dev) |
637 | { | |
638 | struct fsi_slave *slave = to_fsi_slave(dev); | |
639 | ||
0ab5fe53 | 640 | fsi_free_minor(slave->dev.devt); |
f6a2f8eb | 641 | of_node_put(dev->of_node); |
2b545cd8 JK |
642 | kfree(slave); |
643 | } | |
644 | ||
f6a2f8eb JK |
645 | static bool fsi_slave_node_matches(struct device_node *np, |
646 | int link, uint8_t id) | |
647 | { | |
648 | unsigned int len, na, ns; | |
649 | const __be32 *prop; | |
650 | ||
651 | na = of_n_addr_cells(np); | |
652 | ns = of_n_size_cells(np); | |
653 | ||
654 | /* Ensure we have the correct format for addresses and sizes in | |
655 | * reg properties | |
656 | */ | |
657 | if (na != 2 || ns != 0) | |
658 | return false; | |
659 | ||
660 | prop = of_get_property(np, "reg", &len); | |
661 | if (!prop || len != 8) | |
662 | return false; | |
663 | ||
664 | return (of_read_number(prop, 1) == link) && | |
665 | (of_read_number(prop + 1, 1) == id); | |
666 | } | |
667 | ||
668 | /* Find a matching node for the slave at (link, id). Returns NULL if none | |
669 | * found, or a matching node with refcount already incremented. | |
670 | */ | |
671 | static struct device_node *fsi_slave_find_of_node(struct fsi_master *master, | |
672 | int link, uint8_t id) | |
673 | { | |
674 | struct device_node *parent, *np; | |
675 | ||
676 | parent = dev_of_node(&master->dev); | |
677 | if (!parent) | |
678 | return NULL; | |
679 | ||
680 | for_each_child_of_node(parent, np) { | |
681 | if (fsi_slave_node_matches(np, link, id)) | |
682 | return np; | |
683 | } | |
684 | ||
685 | return NULL; | |
686 | } | |
687 | ||
d1dcd678 BH |
688 | static ssize_t cfam_read(struct file *filep, char __user *buf, size_t count, |
689 | loff_t *offset) | |
690 | { | |
691 | struct fsi_slave *slave = filep->private_data; | |
692 | size_t total_len, read_len; | |
693 | loff_t off = *offset; | |
694 | ssize_t rc; | |
695 | ||
696 | if (off < 0) | |
697 | return -EINVAL; | |
698 | ||
699 | if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) | |
700 | return -EINVAL; | |
701 | ||
702 | for (total_len = 0; total_len < count; total_len += read_len) { | |
703 | __be32 data; | |
704 | ||
705 | read_len = min_t(size_t, count, 4); | |
706 | read_len -= off & 0x3; | |
707 | ||
708 | rc = fsi_slave_read(slave, off, &data, read_len); | |
709 | if (rc) | |
710 | goto fail; | |
711 | rc = copy_to_user(buf + total_len, &data, read_len); | |
712 | if (rc) { | |
713 | rc = -EFAULT; | |
714 | goto fail; | |
715 | } | |
716 | off += read_len; | |
717 | } | |
718 | rc = count; | |
719 | fail: | |
720 | *offset = off; | |
721 | return count; | |
722 | } | |
723 | ||
724 | static ssize_t cfam_write(struct file *filep, const char __user *buf, | |
725 | size_t count, loff_t *offset) | |
726 | { | |
727 | struct fsi_slave *slave = filep->private_data; | |
728 | size_t total_len, write_len; | |
729 | loff_t off = *offset; | |
730 | ssize_t rc; | |
731 | ||
732 | ||
733 | if (off < 0) | |
734 | return -EINVAL; | |
735 | ||
736 | if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) | |
737 | return -EINVAL; | |
738 | ||
739 | for (total_len = 0; total_len < count; total_len += write_len) { | |
740 | __be32 data; | |
741 | ||
742 | write_len = min_t(size_t, count, 4); | |
743 | write_len -= off & 0x3; | |
744 | ||
745 | rc = copy_from_user(&data, buf + total_len, write_len); | |
746 | if (rc) { | |
747 | rc = -EFAULT; | |
748 | goto fail; | |
749 | } | |
750 | rc = fsi_slave_write(slave, off, &data, write_len); | |
751 | if (rc) | |
752 | goto fail; | |
753 | off += write_len; | |
754 | } | |
755 | rc = count; | |
756 | fail: | |
757 | *offset = off; | |
758 | return count; | |
759 | } | |
760 | ||
761 | static loff_t cfam_llseek(struct file *file, loff_t offset, int whence) | |
762 | { | |
763 | switch (whence) { | |
764 | case SEEK_CUR: | |
765 | break; | |
766 | case SEEK_SET: | |
767 | file->f_pos = offset; | |
768 | break; | |
769 | default: | |
770 | return -EINVAL; | |
771 | } | |
772 | ||
773 | return offset; | |
774 | } | |
775 | ||
776 | static int cfam_open(struct inode *inode, struct file *file) | |
777 | { | |
778 | struct fsi_slave *slave = container_of(inode->i_cdev, struct fsi_slave, cdev); | |
779 | ||
780 | file->private_data = slave; | |
781 | ||
782 | return 0; | |
783 | } | |
784 | ||
785 | static const struct file_operations cfam_fops = { | |
786 | .owner = THIS_MODULE, | |
787 | .open = cfam_open, | |
788 | .llseek = cfam_llseek, | |
789 | .read = cfam_read, | |
790 | .write = cfam_write, | |
791 | }; | |
792 | ||
793 | static ssize_t send_term_store(struct device *dev, | |
794 | struct device_attribute *attr, | |
795 | const char *buf, size_t count) | |
796 | { | |
797 | struct fsi_slave *slave = to_fsi_slave(dev); | |
798 | struct fsi_master *master = slave->master; | |
799 | ||
800 | if (!master->term) | |
801 | return -ENODEV; | |
802 | ||
803 | master->term(master, slave->link, slave->id); | |
804 | return count; | |
805 | } | |
806 | ||
807 | static DEVICE_ATTR_WO(send_term); | |
808 | ||
a2e7da86 BH |
809 | static ssize_t slave_send_echo_show(struct device *dev, |
810 | struct device_attribute *attr, | |
811 | char *buf) | |
812 | { | |
813 | struct fsi_slave *slave = to_fsi_slave(dev); | |
814 | ||
815 | return sprintf(buf, "%u\n", slave->t_send_delay); | |
816 | } | |
817 | ||
818 | static ssize_t slave_send_echo_store(struct device *dev, | |
819 | struct device_attribute *attr, const char *buf, size_t count) | |
820 | { | |
821 | struct fsi_slave *slave = to_fsi_slave(dev); | |
822 | struct fsi_master *master = slave->master; | |
823 | unsigned long val; | |
824 | int rc; | |
825 | ||
826 | if (kstrtoul(buf, 0, &val) < 0) | |
827 | return -EINVAL; | |
828 | ||
829 | if (val < 1 || val > 16) | |
830 | return -EINVAL; | |
831 | ||
832 | if (!master->link_config) | |
833 | return -ENXIO; | |
834 | ||
835 | /* Current HW mandates that send and echo delay are identical */ | |
836 | slave->t_send_delay = val; | |
837 | slave->t_echo_delay = val; | |
838 | ||
839 | rc = fsi_slave_set_smode(slave); | |
840 | if (rc < 0) | |
841 | return rc; | |
842 | if (master->link_config) | |
843 | master->link_config(master, slave->link, | |
844 | slave->t_send_delay, | |
845 | slave->t_echo_delay); | |
846 | ||
847 | return count; | |
848 | } | |
849 | ||
850 | static DEVICE_ATTR(send_echo_delays, 0600, | |
851 | slave_send_echo_show, slave_send_echo_store); | |
852 | ||
0a213777 BH |
853 | static ssize_t chip_id_show(struct device *dev, |
854 | struct device_attribute *attr, | |
855 | char *buf) | |
856 | { | |
857 | struct fsi_slave *slave = to_fsi_slave(dev); | |
858 | ||
859 | return sprintf(buf, "%d\n", slave->chip_id); | |
860 | } | |
861 | ||
862 | static DEVICE_ATTR_RO(chip_id); | |
863 | ||
d1dcd678 BH |
864 | static ssize_t cfam_id_show(struct device *dev, |
865 | struct device_attribute *attr, | |
866 | char *buf) | |
867 | { | |
868 | struct fsi_slave *slave = to_fsi_slave(dev); | |
869 | ||
870 | return sprintf(buf, "0x%x\n", slave->cfam_id); | |
871 | } | |
872 | ||
873 | static DEVICE_ATTR_RO(cfam_id); | |
874 | ||
875 | static struct attribute *cfam_attr[] = { | |
876 | &dev_attr_send_echo_delays.attr, | |
877 | &dev_attr_chip_id.attr, | |
878 | &dev_attr_cfam_id.attr, | |
879 | &dev_attr_send_term.attr, | |
880 | NULL, | |
881 | }; | |
882 | ||
883 | static const struct attribute_group cfam_attr_group = { | |
884 | .attrs = cfam_attr, | |
885 | }; | |
886 | ||
887 | static const struct attribute_group *cfam_attr_groups[] = { | |
888 | &cfam_attr_group, | |
889 | NULL, | |
890 | }; | |
891 | ||
892 | static char *cfam_devnode(struct device *dev, umode_t *mode, | |
893 | kuid_t *uid, kgid_t *gid) | |
894 | { | |
895 | struct fsi_slave *slave = to_fsi_slave(dev); | |
896 | ||
897 | #ifdef CONFIG_FSI_NEW_DEV_NODE | |
898 | return kasprintf(GFP_KERNEL, "fsi/cfam%d", slave->cdev_idx); | |
899 | #else | |
900 | return kasprintf(GFP_KERNEL, "cfam%d", slave->cdev_idx); | |
901 | #endif | |
902 | } | |
903 | ||
904 | static const struct device_type cfam_type = { | |
905 | .name = "cfam", | |
906 | .devnode = cfam_devnode, | |
907 | .groups = cfam_attr_groups | |
908 | }; | |
909 | ||
0ab5fe53 BH |
910 | static char *fsi_cdev_devnode(struct device *dev, umode_t *mode, |
911 | kuid_t *uid, kgid_t *gid) | |
912 | { | |
913 | #ifdef CONFIG_FSI_NEW_DEV_NODE | |
914 | return kasprintf(GFP_KERNEL, "fsi/%s", dev_name(dev)); | |
915 | #else | |
916 | return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); | |
917 | #endif | |
918 | } | |
919 | ||
920 | const struct device_type fsi_cdev_type = { | |
921 | .name = "fsi-cdev", | |
922 | .devnode = fsi_cdev_devnode, | |
923 | }; | |
924 | EXPORT_SYMBOL_GPL(fsi_cdev_type); | |
925 | ||
926 | /* Backward compatible /dev/ numbering in "old style" mode */ | |
927 | static int fsi_adjust_index(int index) | |
928 | { | |
929 | #ifdef CONFIG_FSI_NEW_DEV_NODE | |
930 | return index; | |
931 | #else | |
932 | return index + 1; | |
933 | #endif | |
934 | } | |
935 | ||
936 | static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type, | |
937 | dev_t *out_dev, int *out_index) | |
938 | { | |
939 | int cid = slave->chip_id; | |
940 | int id; | |
941 | ||
942 | /* Check if we qualify for legacy numbering */ | |
943 | if (cid >= 0 && cid < 16 && type < 4) { | |
944 | /* Try reserving the legacy number */ | |
945 | id = (cid << 4) | type; | |
946 | id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL); | |
947 | if (id >= 0) { | |
948 | *out_index = fsi_adjust_index(cid); | |
949 | *out_dev = fsi_base_dev + id; | |
950 | return 0; | |
951 | } | |
952 | /* Other failure */ | |
953 | if (id != -ENOSPC) | |
954 | return id; | |
955 | /* Fallback to non-legacy allocation */ | |
956 | } | |
957 | id = ida_simple_get(&fsi_minor_ida, FSI_CHAR_LEGACY_TOP, | |
958 | FSI_CHAR_MAX_DEVICES, GFP_KERNEL); | |
959 | if (id < 0) | |
960 | return id; | |
961 | *out_index = fsi_adjust_index(id); | |
962 | *out_dev = fsi_base_dev + id; | |
963 | return 0; | |
964 | } | |
965 | ||
966 | int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type, | |
967 | dev_t *out_dev, int *out_index) | |
968 | { | |
969 | return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index); | |
970 | } | |
971 | EXPORT_SYMBOL_GPL(fsi_get_new_minor); | |
972 | ||
973 | void fsi_free_minor(dev_t dev) | |
974 | { | |
975 | ida_simple_remove(&fsi_minor_ida, MINOR(dev)); | |
976 | } | |
977 | EXPORT_SYMBOL_GPL(fsi_free_minor); | |
978 | ||
414c1026 JK |
979 | static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) |
980 | { | |
d1dcd678 | 981 | uint32_t cfam_id; |
2b545cd8 | 982 | struct fsi_slave *slave; |
2b545cd8 | 983 | uint8_t crc; |
11454d6d | 984 | __be32 data, llmode; |
2b545cd8 JK |
985 | int rc; |
986 | ||
987 | /* Currently, we only support single slaves on a link, and use the | |
988 | * full 23-bit address range | |
989 | */ | |
990 | if (id != 0) | |
991 | return -EINVAL; | |
992 | ||
11454d6d | 993 | rc = fsi_master_read(master, link, id, 0, &data, sizeof(data)); |
2b545cd8 JK |
994 | if (rc) { |
995 | dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", | |
996 | link, id, rc); | |
997 | return -ENODEV; | |
998 | } | |
d1dcd678 | 999 | cfam_id = be32_to_cpu(data); |
2b545cd8 | 1000 | |
d1dcd678 | 1001 | crc = crc4(0, cfam_id, 32); |
2b545cd8 | 1002 | if (crc) { |
d1dcd678 | 1003 | dev_warn(&master->dev, "slave %02x:%02x invalid cfam id CRC!\n", |
2b545cd8 JK |
1004 | link, id); |
1005 | return -EIO; | |
1006 | } | |
1007 | ||
638bd9ac | 1008 | dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", |
d1dcd678 | 1009 | cfam_id, master->idx, link, id); |
2b545cd8 | 1010 | |
4af889b0 JK |
1011 | /* If we're behind a master that doesn't provide a self-running bus |
1012 | * clock, put the slave into async mode | |
1013 | */ | |
1014 | if (master->flags & FSI_MASTER_FLAG_SWCLOCK) { | |
1015 | llmode = cpu_to_be32(FSI_LLMODE_ASYNC); | |
1016 | rc = fsi_master_write(master, link, id, | |
1017 | FSI_SLAVE_BASE + FSI_LLMODE, | |
1018 | &llmode, sizeof(llmode)); | |
1019 | if (rc) | |
1020 | dev_warn(&master->dev, | |
1021 | "can't set llmode on slave:%02x:%02x %d\n", | |
1022 | link, id, rc); | |
1023 | } | |
1024 | ||
2b545cd8 JK |
1025 | /* We can communicate with a slave; create the slave device and |
1026 | * register. | |
1027 | */ | |
1028 | slave = kzalloc(sizeof(*slave), GFP_KERNEL); | |
1029 | if (!slave) | |
1030 | return -ENOMEM; | |
1031 | ||
d1dcd678 BH |
1032 | dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); |
1033 | slave->dev.type = &cfam_type; | |
2b545cd8 | 1034 | slave->dev.parent = &master->dev; |
f6a2f8eb | 1035 | slave->dev.of_node = fsi_slave_find_of_node(master, link, id); |
2b545cd8 | 1036 | slave->dev.release = fsi_slave_release; |
d1dcd678 BH |
1037 | device_initialize(&slave->dev); |
1038 | slave->cfam_id = cfam_id; | |
1039 | slave->master = master; | |
2b545cd8 JK |
1040 | slave->link = link; |
1041 | slave->id = id; | |
1042 | slave->size = FSI_SLAVE_SIZE_23b; | |
a2e7da86 BH |
1043 | slave->t_send_delay = 16; |
1044 | slave->t_echo_delay = 16; | |
1045 | ||
0a213777 BH |
1046 | /* Get chip ID if any */ |
1047 | slave->chip_id = -1; | |
1048 | if (slave->dev.of_node) { | |
1049 | uint32_t prop; | |
1050 | if (!of_property_read_u32(slave->dev.of_node, "chip-id", &prop)) | |
1051 | slave->chip_id = prop; | |
1052 | ||
1053 | } | |
d1dcd678 | 1054 | |
371975b0 JK |
1055 | rc = fsi_slave_set_smode(slave); |
1056 | if (rc) { | |
1057 | dev_warn(&master->dev, | |
1058 | "can't set smode on slave:%02x:%02x %d\n", | |
1059 | link, id, rc); | |
1060 | goto err_free; | |
1061 | } | |
1062 | ||
d1dcd678 BH |
1063 | /* Allocate a minor in the FSI space */ |
1064 | rc = __fsi_get_new_minor(slave, fsi_dev_cfam, &slave->dev.devt, | |
1065 | &slave->cdev_idx); | |
1066 | if (rc) | |
1067 | goto err_free; | |
1068 | ||
1069 | /* Create chardev for userspace access */ | |
1070 | cdev_init(&slave->cdev, &cfam_fops); | |
1071 | rc = cdev_device_add(&slave->cdev, &slave->dev); | |
1072 | if (rc) { | |
1073 | dev_err(&slave->dev, "Error %d creating slave device\n", rc); | |
371975b0 | 1074 | goto err_free_ida; |
d1dcd678 BH |
1075 | } |
1076 | ||
371975b0 JK |
1077 | /* Now that we have the cdev registered with the core, any fatal |
1078 | * failures beyond this point will need to clean up through | |
1079 | * cdev_device_del(). Fortunately though, nothing past here is fatal. | |
1080 | */ | |
1081 | ||
a2e7da86 BH |
1082 | if (master->link_config) |
1083 | master->link_config(master, link, | |
1084 | slave->t_send_delay, | |
1085 | slave->t_echo_delay); | |
2b545cd8 | 1086 | |
d1dcd678 | 1087 | /* Legacy raw file -> to be removed */ |
125739cb JK |
1088 | rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); |
1089 | if (rc) | |
1090 | dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); | |
1091 | ||
0a213777 | 1092 | |
f7ade2a6 JK |
1093 | rc = fsi_slave_scan(slave); |
1094 | if (rc) | |
1095 | dev_dbg(&master->dev, "failed during slave scan with: %d\n", | |
1096 | rc); | |
414c1026 | 1097 | |
371975b0 | 1098 | return 0; |
d1dcd678 | 1099 | |
371975b0 JK |
1100 | err_free_ida: |
1101 | fsi_free_minor(slave->dev.devt); | |
1102 | err_free: | |
1103 | of_node_put(slave->dev.of_node); | |
1104 | kfree(slave); | |
d1dcd678 | 1105 | return rc; |
414c1026 JK |
1106 | } |
1107 | ||
09aecfab | 1108 | /* FSI master support */ |
014c2abc JK |
1109 | static int fsi_check_access(uint32_t addr, size_t size) |
1110 | { | |
99f039e9 EJ |
1111 | if (size == 4) { |
1112 | if (addr & 0x3) | |
1113 | return -EINVAL; | |
1114 | } else if (size == 2) { | |
1115 | if (addr & 0x1) | |
1116 | return -EINVAL; | |
1117 | } else if (size != 1) | |
014c2abc JK |
1118 | return -EINVAL; |
1119 | ||
1120 | return 0; | |
1121 | } | |
1122 | ||
1123 | static int fsi_master_read(struct fsi_master *master, int link, | |
1124 | uint8_t slave_id, uint32_t addr, void *val, size_t size) | |
1125 | { | |
1126 | int rc; | |
1127 | ||
66433b05 JK |
1128 | trace_fsi_master_read(master, link, slave_id, addr, size); |
1129 | ||
014c2abc | 1130 | rc = fsi_check_access(addr, size); |
66433b05 JK |
1131 | if (!rc) |
1132 | rc = master->read(master, link, slave_id, addr, val, size); | |
1133 | ||
1134 | trace_fsi_master_rw_result(master, link, slave_id, addr, size, | |
1135 | false, val, rc); | |
014c2abc | 1136 | |
66433b05 | 1137 | return rc; |
014c2abc JK |
1138 | } |
1139 | ||
1140 | static int fsi_master_write(struct fsi_master *master, int link, | |
1141 | uint8_t slave_id, uint32_t addr, const void *val, size_t size) | |
1142 | { | |
1143 | int rc; | |
1144 | ||
66433b05 JK |
1145 | trace_fsi_master_write(master, link, slave_id, addr, size, val); |
1146 | ||
014c2abc | 1147 | rc = fsi_check_access(addr, size); |
66433b05 JK |
1148 | if (!rc) |
1149 | rc = master->write(master, link, slave_id, addr, val, size); | |
014c2abc | 1150 | |
66433b05 JK |
1151 | trace_fsi_master_rw_result(master, link, slave_id, addr, size, |
1152 | true, val, rc); | |
1153 | ||
1154 | return rc; | |
014c2abc JK |
1155 | } |
1156 | ||
26095282 CB |
1157 | static int fsi_master_link_enable(struct fsi_master *master, int link) |
1158 | { | |
1159 | if (master->link_enable) | |
1160 | return master->link_enable(master, link); | |
1161 | ||
1162 | return 0; | |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * Issue a break command on this link | |
1167 | */ | |
1168 | static int fsi_master_break(struct fsi_master *master, int link) | |
1169 | { | |
a2e7da86 BH |
1170 | int rc = 0; |
1171 | ||
66433b05 JK |
1172 | trace_fsi_master_break(master, link); |
1173 | ||
26095282 | 1174 | if (master->send_break) |
a2e7da86 BH |
1175 | rc = master->send_break(master, link); |
1176 | if (master->link_config) | |
1177 | master->link_config(master, link, 16, 16); | |
26095282 | 1178 | |
a2e7da86 | 1179 | return rc; |
26095282 CB |
1180 | } |
1181 | ||
414c1026 JK |
1182 | static int fsi_master_scan(struct fsi_master *master) |
1183 | { | |
26095282 CB |
1184 | int link, rc; |
1185 | ||
1186 | for (link = 0; link < master->n_links; link++) { | |
1187 | rc = fsi_master_link_enable(master, link); | |
1188 | if (rc) { | |
1189 | dev_dbg(&master->dev, | |
1190 | "enable link %d failed: %d\n", link, rc); | |
1191 | continue; | |
1192 | } | |
1193 | rc = fsi_master_break(master, link); | |
1194 | if (rc) { | |
1195 | dev_dbg(&master->dev, | |
1196 | "break to link %d failed: %d\n", link, rc); | |
1197 | continue; | |
1198 | } | |
414c1026 | 1199 | |
414c1026 | 1200 | fsi_slave_init(master, link, 0); |
26095282 | 1201 | } |
414c1026 JK |
1202 | |
1203 | return 0; | |
1204 | } | |
1205 | ||
cd0fdb5c CB |
1206 | static int fsi_slave_remove_device(struct device *dev, void *arg) |
1207 | { | |
1208 | device_unregister(dev); | |
1209 | return 0; | |
1210 | } | |
1211 | ||
1212 | static int fsi_master_remove_slave(struct device *dev, void *arg) | |
1213 | { | |
d1dcd678 BH |
1214 | struct fsi_slave *slave = to_fsi_slave(dev); |
1215 | ||
cd0fdb5c | 1216 | device_for_each_child(dev, NULL, fsi_slave_remove_device); |
d1dcd678 | 1217 | cdev_device_del(&slave->cdev, &slave->dev); |
0ab5fe53 | 1218 | put_device(dev); |
cd0fdb5c CB |
1219 | return 0; |
1220 | } | |
1221 | ||
1222 | static void fsi_master_unscan(struct fsi_master *master) | |
1223 | { | |
1224 | device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); | |
1225 | } | |
1226 | ||
15362d69 JK |
1227 | int fsi_master_rescan(struct fsi_master *master) |
1228 | { | |
9840fcd8 BH |
1229 | int rc; |
1230 | ||
1231 | mutex_lock(&master->scan_lock); | |
15362d69 | 1232 | fsi_master_unscan(master); |
9840fcd8 BH |
1233 | rc = fsi_master_scan(master); |
1234 | mutex_unlock(&master->scan_lock); | |
1235 | ||
1236 | return rc; | |
15362d69 JK |
1237 | } |
1238 | EXPORT_SYMBOL_GPL(fsi_master_rescan); | |
1239 | ||
cd0fdb5c CB |
1240 | static ssize_t master_rescan_store(struct device *dev, |
1241 | struct device_attribute *attr, const char *buf, size_t count) | |
1242 | { | |
1243 | struct fsi_master *master = to_fsi_master(dev); | |
1244 | int rc; | |
1245 | ||
15362d69 | 1246 | rc = fsi_master_rescan(master); |
cd0fdb5c CB |
1247 | if (rc < 0) |
1248 | return rc; | |
1249 | ||
1250 | return count; | |
1251 | } | |
1252 | ||
1253 | static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); | |
1254 | ||
125739cb JK |
1255 | static ssize_t master_break_store(struct device *dev, |
1256 | struct device_attribute *attr, const char *buf, size_t count) | |
1257 | { | |
1258 | struct fsi_master *master = to_fsi_master(dev); | |
1259 | ||
1260 | fsi_master_break(master, 0); | |
1261 | ||
1262 | return count; | |
1263 | } | |
1264 | ||
1265 | static DEVICE_ATTR(break, 0200, NULL, master_break_store); | |
1266 | ||
cf700ba0 JK |
1267 | static struct attribute *master_attrs[] = { |
1268 | &dev_attr_break.attr, | |
1269 | &dev_attr_rescan.attr, | |
1270 | NULL | |
1271 | }; | |
1272 | ||
1273 | ATTRIBUTE_GROUPS(master); | |
1274 | ||
56ec311f | 1275 | static struct class fsi_master_class = { |
2e32c2d6 | 1276 | .name = "fsi-master", |
cf700ba0 | 1277 | .dev_groups = master_groups, |
2e32c2d6 JK |
1278 | }; |
1279 | ||
09aecfab JK |
1280 | int fsi_master_register(struct fsi_master *master) |
1281 | { | |
1282 | int rc; | |
f3aa2c6f | 1283 | struct device_node *np; |
09aecfab | 1284 | |
9840fcd8 | 1285 | mutex_init(&master->scan_lock); |
09aecfab JK |
1286 | master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); |
1287 | dev_set_name(&master->dev, "fsi%d", master->idx); | |
2e32c2d6 | 1288 | master->dev.class = &fsi_master_class; |
09aecfab JK |
1289 | |
1290 | rc = device_register(&master->dev); | |
414c1026 | 1291 | if (rc) { |
09aecfab | 1292 | ida_simple_remove(&master_ida, master->idx); |
414c1026 JK |
1293 | return rc; |
1294 | } | |
09aecfab | 1295 | |
f3aa2c6f | 1296 | np = dev_of_node(&master->dev); |
9840fcd8 BH |
1297 | if (!of_property_read_bool(np, "no-scan-on-init")) { |
1298 | mutex_lock(&master->scan_lock); | |
f3aa2c6f | 1299 | fsi_master_scan(master); |
9840fcd8 BH |
1300 | mutex_unlock(&master->scan_lock); |
1301 | } | |
cd0fdb5c | 1302 | |
414c1026 | 1303 | return 0; |
09aecfab JK |
1304 | } |
1305 | EXPORT_SYMBOL_GPL(fsi_master_register); | |
1306 | ||
1307 | void fsi_master_unregister(struct fsi_master *master) | |
1308 | { | |
1309 | if (master->idx >= 0) { | |
1310 | ida_simple_remove(&master_ida, master->idx); | |
1311 | master->idx = -1; | |
1312 | } | |
1313 | ||
9840fcd8 | 1314 | mutex_lock(&master->scan_lock); |
cd0fdb5c | 1315 | fsi_master_unscan(master); |
9840fcd8 | 1316 | mutex_unlock(&master->scan_lock); |
09aecfab JK |
1317 | device_unregister(&master->dev); |
1318 | } | |
1319 | EXPORT_SYMBOL_GPL(fsi_master_unregister); | |
1320 | ||
0508ad1f JK |
1321 | /* FSI core & Linux bus type definitions */ |
1322 | ||
dd37eed7 JK |
1323 | static int fsi_bus_match(struct device *dev, struct device_driver *drv) |
1324 | { | |
1325 | struct fsi_device *fsi_dev = to_fsi_dev(dev); | |
1326 | struct fsi_driver *fsi_drv = to_fsi_drv(drv); | |
1327 | const struct fsi_device_id *id; | |
1328 | ||
1329 | if (!fsi_drv->id_table) | |
1330 | return 0; | |
1331 | ||
1332 | for (id = fsi_drv->id_table; id->engine_type; id++) { | |
1333 | if (id->engine_type != fsi_dev->engine_type) | |
1334 | continue; | |
1335 | if (id->version == FSI_VERSION_ANY || | |
1336 | id->version == fsi_dev->version) | |
1337 | return 1; | |
1338 | } | |
1339 | ||
1340 | return 0; | |
1341 | } | |
1342 | ||
356d8009 CB |
1343 | int fsi_driver_register(struct fsi_driver *fsi_drv) |
1344 | { | |
1345 | if (!fsi_drv) | |
1346 | return -EINVAL; | |
1347 | if (!fsi_drv->id_table) | |
1348 | return -EINVAL; | |
1349 | ||
1350 | return driver_register(&fsi_drv->drv); | |
1351 | } | |
1352 | EXPORT_SYMBOL_GPL(fsi_driver_register); | |
1353 | ||
1354 | void fsi_driver_unregister(struct fsi_driver *fsi_drv) | |
1355 | { | |
1356 | driver_unregister(&fsi_drv->drv); | |
1357 | } | |
1358 | EXPORT_SYMBOL_GPL(fsi_driver_unregister); | |
1359 | ||
0508ad1f JK |
1360 | struct bus_type fsi_bus_type = { |
1361 | .name = "fsi", | |
dd37eed7 | 1362 | .match = fsi_bus_match, |
0508ad1f JK |
1363 | }; |
1364 | EXPORT_SYMBOL_GPL(fsi_bus_type); | |
1365 | ||
496f8931 | 1366 | static int __init fsi_init(void) |
0508ad1f | 1367 | { |
0ab5fe53 BH |
1368 | int rc; |
1369 | ||
1370 | rc = alloc_chrdev_region(&fsi_base_dev, 0, FSI_CHAR_MAX_DEVICES, "fsi"); | |
1371 | if (rc) | |
1372 | return rc; | |
1373 | rc = bus_register(&fsi_bus_type); | |
1374 | if (rc) | |
1375 | goto fail_bus; | |
2e32c2d6 JK |
1376 | |
1377 | rc = class_register(&fsi_master_class); | |
1378 | if (rc) | |
1379 | goto fail_class; | |
1380 | ||
0ab5fe53 BH |
1381 | return 0; |
1382 | ||
2e32c2d6 JK |
1383 | fail_class: |
1384 | bus_unregister(&fsi_bus_type); | |
0ab5fe53 BH |
1385 | fail_bus: |
1386 | unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); | |
1387 | return rc; | |
0508ad1f | 1388 | } |
496f8931 | 1389 | postcore_initcall(fsi_init); |
0508ad1f JK |
1390 | |
1391 | static void fsi_exit(void) | |
1392 | { | |
2e32c2d6 | 1393 | class_unregister(&fsi_master_class); |
0508ad1f | 1394 | bus_unregister(&fsi_bus_type); |
0ab5fe53 BH |
1395 | unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); |
1396 | ida_destroy(&fsi_minor_ida); | |
0508ad1f | 1397 | } |
0508ad1f | 1398 | module_exit(fsi_exit); |
1fa847d7 | 1399 | module_param(discard_errors, int, 0664); |
acb7e8f7 | 1400 | MODULE_LICENSE("GPL"); |
1fa847d7 | 1401 | MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); |