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99182a42 DS |
1 | /* |
2 | * Driver for IBM PowerNV 842 compression accelerator | |
3 | * | |
4 | * Copyright (C) 2015 Dan Streetman, IBM Corp | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | */ | |
16 | ||
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
18 | ||
19 | #include "nx-842.h" | |
20 | ||
21 | #include <linux/timer.h> | |
22 | ||
23 | #include <asm/prom.h> | |
24 | #include <asm/icswx.h> | |
25 | ||
99182a42 DS |
26 | MODULE_LICENSE("GPL"); |
27 | MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>"); | |
28 | MODULE_DESCRIPTION("842 H/W Compression driver for IBM PowerNV processors"); | |
29 | ||
30 | #define WORKMEM_ALIGN (CRB_ALIGN) | |
31 | #define CSB_WAIT_MAX (5000) /* ms */ | |
32 | ||
33 | struct nx842_workmem { | |
34 | /* Below fields must be properly aligned */ | |
35 | struct coprocessor_request_block crb; /* CRB_ALIGN align */ | |
36 | struct data_descriptor_entry ddl_in[DDL_LEN_MAX]; /* DDE_ALIGN align */ | |
37 | struct data_descriptor_entry ddl_out[DDL_LEN_MAX]; /* DDE_ALIGN align */ | |
38 | /* Above fields must be properly aligned */ | |
39 | ||
40 | ktime_t start; | |
41 | ||
42 | char padding[WORKMEM_ALIGN]; /* unused, to allow alignment */ | |
43 | } __packed __aligned(WORKMEM_ALIGN); | |
44 | ||
45 | struct nx842_coproc { | |
46 | unsigned int chip_id; | |
47 | unsigned int ct; | |
48 | unsigned int ci; | |
49 | struct list_head list; | |
50 | }; | |
51 | ||
52 | /* no cpu hotplug on powernv, so this list never changes after init */ | |
53 | static LIST_HEAD(nx842_coprocs); | |
54 | static unsigned int nx842_ct; | |
55 | ||
56 | /** | |
57 | * setup_indirect_dde - Setup an indirect DDE | |
58 | * | |
59 | * The DDE is setup with the the DDE count, byte count, and address of | |
60 | * first direct DDE in the list. | |
61 | */ | |
62 | static void setup_indirect_dde(struct data_descriptor_entry *dde, | |
63 | struct data_descriptor_entry *ddl, | |
64 | unsigned int dde_count, unsigned int byte_count) | |
65 | { | |
66 | dde->flags = 0; | |
67 | dde->count = dde_count; | |
68 | dde->index = 0; | |
69 | dde->length = cpu_to_be32(byte_count); | |
70 | dde->address = cpu_to_be64(nx842_get_pa(ddl)); | |
71 | } | |
72 | ||
73 | /** | |
74 | * setup_direct_dde - Setup single DDE from buffer | |
75 | * | |
76 | * The DDE is setup with the buffer and length. The buffer must be properly | |
77 | * aligned. The used length is returned. | |
78 | * Returns: | |
79 | * N Successfully set up DDE with N bytes | |
80 | */ | |
81 | static unsigned int setup_direct_dde(struct data_descriptor_entry *dde, | |
82 | unsigned long pa, unsigned int len) | |
83 | { | |
84 | unsigned int l = min_t(unsigned int, len, LEN_ON_PAGE(pa)); | |
85 | ||
86 | dde->flags = 0; | |
87 | dde->count = 0; | |
88 | dde->index = 0; | |
89 | dde->length = cpu_to_be32(l); | |
90 | dde->address = cpu_to_be64(pa); | |
91 | ||
92 | return l; | |
93 | } | |
94 | ||
95 | /** | |
96 | * setup_ddl - Setup DDL from buffer | |
97 | * | |
98 | * Returns: | |
99 | * 0 Successfully set up DDL | |
100 | */ | |
101 | static int setup_ddl(struct data_descriptor_entry *dde, | |
102 | struct data_descriptor_entry *ddl, | |
103 | unsigned char *buf, unsigned int len, | |
104 | bool in) | |
105 | { | |
106 | unsigned long pa = nx842_get_pa(buf); | |
107 | int i, ret, total_len = len; | |
108 | ||
109 | if (!IS_ALIGNED(pa, DDE_BUFFER_ALIGN)) { | |
110 | pr_debug("%s buffer pa 0x%lx not 0x%x-byte aligned\n", | |
111 | in ? "input" : "output", pa, DDE_BUFFER_ALIGN); | |
112 | return -EINVAL; | |
113 | } | |
114 | ||
115 | /* only need to check last mult; since buffer must be | |
116 | * DDE_BUFFER_ALIGN aligned, and that is a multiple of | |
117 | * DDE_BUFFER_SIZE_MULT, and pre-last page DDE buffers | |
118 | * are guaranteed a multiple of DDE_BUFFER_SIZE_MULT. | |
119 | */ | |
120 | if (len % DDE_BUFFER_LAST_MULT) { | |
121 | pr_debug("%s buffer len 0x%x not a multiple of 0x%x\n", | |
122 | in ? "input" : "output", len, DDE_BUFFER_LAST_MULT); | |
123 | if (in) | |
124 | return -EINVAL; | |
125 | len = round_down(len, DDE_BUFFER_LAST_MULT); | |
126 | } | |
127 | ||
128 | /* use a single direct DDE */ | |
129 | if (len <= LEN_ON_PAGE(pa)) { | |
130 | ret = setup_direct_dde(dde, pa, len); | |
131 | WARN_ON(ret < len); | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* use the DDL */ | |
136 | for (i = 0; i < DDL_LEN_MAX && len > 0; i++) { | |
137 | ret = setup_direct_dde(&ddl[i], pa, len); | |
138 | buf += ret; | |
139 | len -= ret; | |
140 | pa = nx842_get_pa(buf); | |
141 | } | |
142 | ||
143 | if (len > 0) { | |
144 | pr_debug("0x%x total %s bytes 0x%x too many for DDL.\n", | |
145 | total_len, in ? "input" : "output", len); | |
146 | if (in) | |
147 | return -EMSGSIZE; | |
148 | total_len -= len; | |
149 | } | |
150 | setup_indirect_dde(dde, ddl, i, total_len); | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | #define CSB_ERR(csb, msg, ...) \ | |
156 | pr_err("ERROR: " msg " : %02x %02x %02x %02x %08x\n", \ | |
157 | ##__VA_ARGS__, (csb)->flags, \ | |
158 | (csb)->cs, (csb)->cc, (csb)->ce, \ | |
159 | be32_to_cpu((csb)->count)) | |
160 | ||
161 | #define CSB_ERR_ADDR(csb, msg, ...) \ | |
162 | CSB_ERR(csb, msg " at %lx", ##__VA_ARGS__, \ | |
163 | (unsigned long)be64_to_cpu((csb)->address)) | |
164 | ||
165 | /** | |
166 | * wait_for_csb | |
167 | */ | |
168 | static int wait_for_csb(struct nx842_workmem *wmem, | |
169 | struct coprocessor_status_block *csb) | |
170 | { | |
171 | ktime_t start = wmem->start, now = ktime_get(); | |
172 | ktime_t timeout = ktime_add_ms(start, CSB_WAIT_MAX); | |
173 | ||
174 | while (!(ACCESS_ONCE(csb->flags) & CSB_V)) { | |
175 | cpu_relax(); | |
176 | now = ktime_get(); | |
177 | if (ktime_after(now, timeout)) | |
178 | break; | |
179 | } | |
180 | ||
181 | /* hw has updated csb and output buffer */ | |
182 | barrier(); | |
183 | ||
184 | /* check CSB flags */ | |
185 | if (!(csb->flags & CSB_V)) { | |
186 | CSB_ERR(csb, "CSB still not valid after %ld us, giving up", | |
187 | (long)ktime_us_delta(now, start)); | |
188 | return -ETIMEDOUT; | |
189 | } | |
190 | if (csb->flags & CSB_F) { | |
191 | CSB_ERR(csb, "Invalid CSB format"); | |
192 | return -EPROTO; | |
193 | } | |
194 | if (csb->flags & CSB_CH) { | |
195 | CSB_ERR(csb, "Invalid CSB chaining state"); | |
196 | return -EPROTO; | |
197 | } | |
198 | ||
199 | /* verify CSB completion sequence is 0 */ | |
200 | if (csb->cs) { | |
201 | CSB_ERR(csb, "Invalid CSB completion sequence"); | |
202 | return -EPROTO; | |
203 | } | |
204 | ||
205 | /* check CSB Completion Code */ | |
206 | switch (csb->cc) { | |
207 | /* no error */ | |
208 | case CSB_CC_SUCCESS: | |
209 | break; | |
210 | case CSB_CC_TPBC_GT_SPBC: | |
211 | /* not an error, but the compressed data is | |
212 | * larger than the uncompressed data :( | |
213 | */ | |
214 | break; | |
215 | ||
216 | /* input data errors */ | |
217 | case CSB_CC_OPERAND_OVERLAP: | |
218 | /* input and output buffers overlap */ | |
219 | CSB_ERR(csb, "Operand Overlap error"); | |
220 | return -EINVAL; | |
221 | case CSB_CC_INVALID_OPERAND: | |
222 | CSB_ERR(csb, "Invalid operand"); | |
223 | return -EINVAL; | |
224 | case CSB_CC_NOSPC: | |
225 | /* output buffer too small */ | |
226 | return -ENOSPC; | |
227 | case CSB_CC_ABORT: | |
228 | CSB_ERR(csb, "Function aborted"); | |
229 | return -EINTR; | |
230 | case CSB_CC_CRC_MISMATCH: | |
231 | CSB_ERR(csb, "CRC mismatch"); | |
232 | return -EINVAL; | |
233 | case CSB_CC_TEMPL_INVALID: | |
234 | CSB_ERR(csb, "Compressed data template invalid"); | |
235 | return -EINVAL; | |
236 | case CSB_CC_TEMPL_OVERFLOW: | |
237 | CSB_ERR(csb, "Compressed data template shows data past end"); | |
238 | return -EINVAL; | |
239 | ||
240 | /* these should not happen */ | |
241 | case CSB_CC_INVALID_ALIGN: | |
242 | /* setup_ddl should have detected this */ | |
243 | CSB_ERR_ADDR(csb, "Invalid alignment"); | |
244 | return -EINVAL; | |
245 | case CSB_CC_DATA_LENGTH: | |
246 | /* setup_ddl should have detected this */ | |
247 | CSB_ERR(csb, "Invalid data length"); | |
248 | return -EINVAL; | |
249 | case CSB_CC_WR_TRANSLATION: | |
250 | case CSB_CC_TRANSLATION: | |
251 | case CSB_CC_TRANSLATION_DUP1: | |
252 | case CSB_CC_TRANSLATION_DUP2: | |
253 | case CSB_CC_TRANSLATION_DUP3: | |
254 | case CSB_CC_TRANSLATION_DUP4: | |
255 | case CSB_CC_TRANSLATION_DUP5: | |
256 | case CSB_CC_TRANSLATION_DUP6: | |
257 | /* should not happen, we use physical addrs */ | |
258 | CSB_ERR_ADDR(csb, "Translation error"); | |
259 | return -EPROTO; | |
260 | case CSB_CC_WR_PROTECTION: | |
261 | case CSB_CC_PROTECTION: | |
262 | case CSB_CC_PROTECTION_DUP1: | |
263 | case CSB_CC_PROTECTION_DUP2: | |
264 | case CSB_CC_PROTECTION_DUP3: | |
265 | case CSB_CC_PROTECTION_DUP4: | |
266 | case CSB_CC_PROTECTION_DUP5: | |
267 | case CSB_CC_PROTECTION_DUP6: | |
268 | /* should not happen, we use physical addrs */ | |
269 | CSB_ERR_ADDR(csb, "Protection error"); | |
270 | return -EPROTO; | |
271 | case CSB_CC_PRIVILEGE: | |
272 | /* shouldn't happen, we're in HYP mode */ | |
273 | CSB_ERR(csb, "Insufficient Privilege error"); | |
274 | return -EPROTO; | |
275 | case CSB_CC_EXCESSIVE_DDE: | |
276 | /* shouldn't happen, setup_ddl doesn't use many dde's */ | |
277 | CSB_ERR(csb, "Too many DDEs in DDL"); | |
278 | return -EINVAL; | |
279 | case CSB_CC_TRANSPORT: | |
280 | /* shouldn't happen, we setup CRB correctly */ | |
281 | CSB_ERR(csb, "Invalid CRB"); | |
282 | return -EINVAL; | |
283 | case CSB_CC_SEGMENTED_DDL: | |
284 | /* shouldn't happen, setup_ddl creates DDL right */ | |
285 | CSB_ERR(csb, "Segmented DDL error"); | |
286 | return -EINVAL; | |
287 | case CSB_CC_DDE_OVERFLOW: | |
288 | /* shouldn't happen, setup_ddl creates DDL right */ | |
289 | CSB_ERR(csb, "DDE overflow error"); | |
290 | return -EINVAL; | |
291 | case CSB_CC_SESSION: | |
292 | /* should not happen with ICSWX */ | |
293 | CSB_ERR(csb, "Session violation error"); | |
294 | return -EPROTO; | |
295 | case CSB_CC_CHAIN: | |
296 | /* should not happen, we don't use chained CRBs */ | |
297 | CSB_ERR(csb, "Chained CRB error"); | |
298 | return -EPROTO; | |
299 | case CSB_CC_SEQUENCE: | |
300 | /* should not happen, we don't use chained CRBs */ | |
301 | CSB_ERR(csb, "CRB seqeunce number error"); | |
302 | return -EPROTO; | |
303 | case CSB_CC_UNKNOWN_CODE: | |
304 | CSB_ERR(csb, "Unknown subfunction code"); | |
305 | return -EPROTO; | |
306 | ||
307 | /* hardware errors */ | |
308 | case CSB_CC_RD_EXTERNAL: | |
309 | case CSB_CC_RD_EXTERNAL_DUP1: | |
310 | case CSB_CC_RD_EXTERNAL_DUP2: | |
311 | case CSB_CC_RD_EXTERNAL_DUP3: | |
312 | CSB_ERR_ADDR(csb, "Read error outside coprocessor"); | |
313 | return -EPROTO; | |
314 | case CSB_CC_WR_EXTERNAL: | |
315 | CSB_ERR_ADDR(csb, "Write error outside coprocessor"); | |
316 | return -EPROTO; | |
317 | case CSB_CC_INTERNAL: | |
318 | CSB_ERR(csb, "Internal error in coprocessor"); | |
319 | return -EPROTO; | |
320 | case CSB_CC_PROVISION: | |
321 | CSB_ERR(csb, "Storage provision error"); | |
322 | return -EPROTO; | |
323 | case CSB_CC_HW: | |
324 | CSB_ERR(csb, "Correctable hardware error"); | |
325 | return -EPROTO; | |
326 | ||
327 | default: | |
328 | CSB_ERR(csb, "Invalid CC %d", csb->cc); | |
329 | return -EPROTO; | |
330 | } | |
331 | ||
332 | /* check Completion Extension state */ | |
333 | if (csb->ce & CSB_CE_TERMINATION) { | |
334 | CSB_ERR(csb, "CSB request was terminated"); | |
335 | return -EPROTO; | |
336 | } | |
337 | if (csb->ce & CSB_CE_INCOMPLETE) { | |
338 | CSB_ERR(csb, "CSB request not complete"); | |
339 | return -EPROTO; | |
340 | } | |
341 | if (!(csb->ce & CSB_CE_TPBC)) { | |
342 | CSB_ERR(csb, "TPBC not provided, unknown target length"); | |
343 | return -EPROTO; | |
344 | } | |
345 | ||
346 | /* successful completion */ | |
347 | pr_debug_ratelimited("Processed %u bytes in %lu us\n", csb->count, | |
348 | (unsigned long)ktime_us_delta(now, start)); | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | /** | |
354 | * nx842_powernv_function - compress/decompress data using the 842 algorithm | |
355 | * | |
356 | * (De)compression provided by the NX842 coprocessor on IBM PowerNV systems. | |
357 | * This compresses or decompresses the provided input buffer into the provided | |
358 | * output buffer. | |
359 | * | |
360 | * Upon return from this function @outlen contains the length of the | |
361 | * output data. If there is an error then @outlen will be 0 and an | |
362 | * error will be specified by the return code from this function. | |
363 | * | |
364 | * The @workmem buffer should only be used by one function call at a time. | |
365 | * | |
366 | * @in: input buffer pointer | |
367 | * @inlen: input buffer size | |
368 | * @out: output buffer pointer | |
369 | * @outlenp: output buffer size pointer | |
2c6f6eab DS |
370 | * @workmem: working memory buffer pointer, size determined by |
371 | * nx842_powernv_driver.workmem_size | |
99182a42 DS |
372 | * @fc: function code, see CCW Function Codes in nx-842.h |
373 | * | |
374 | * Returns: | |
375 | * 0 Success, output of length @outlenp stored in the buffer at @out | |
376 | * -ENODEV Hardware unavailable | |
377 | * -ENOSPC Output buffer is to small | |
378 | * -EMSGSIZE Input buffer too large | |
379 | * -EINVAL buffer constraints do not fix nx842_constraints | |
380 | * -EPROTO hardware error during operation | |
381 | * -ETIMEDOUT hardware did not complete operation in reasonable time | |
382 | * -EINTR operation was aborted | |
383 | */ | |
384 | static int nx842_powernv_function(const unsigned char *in, unsigned int inlen, | |
385 | unsigned char *out, unsigned int *outlenp, | |
386 | void *workmem, int fc) | |
387 | { | |
388 | struct coprocessor_request_block *crb; | |
389 | struct coprocessor_status_block *csb; | |
390 | struct nx842_workmem *wmem; | |
391 | int ret; | |
392 | u64 csb_addr; | |
393 | u32 ccw; | |
394 | unsigned int outlen = *outlenp; | |
395 | ||
396 | wmem = PTR_ALIGN(workmem, WORKMEM_ALIGN); | |
397 | ||
398 | *outlenp = 0; | |
399 | ||
400 | /* shoudn't happen, we don't load without a coproc */ | |
401 | if (!nx842_ct) { | |
402 | pr_err_ratelimited("coprocessor CT is 0"); | |
403 | return -ENODEV; | |
404 | } | |
405 | ||
406 | crb = &wmem->crb; | |
407 | csb = &crb->csb; | |
408 | ||
409 | /* Clear any previous values */ | |
410 | memset(crb, 0, sizeof(*crb)); | |
411 | ||
412 | /* set up DDLs */ | |
413 | ret = setup_ddl(&crb->source, wmem->ddl_in, | |
414 | (unsigned char *)in, inlen, true); | |
415 | if (ret) | |
416 | return ret; | |
417 | ret = setup_ddl(&crb->target, wmem->ddl_out, | |
418 | out, outlen, false); | |
419 | if (ret) | |
420 | return ret; | |
421 | ||
422 | /* set up CCW */ | |
423 | ccw = 0; | |
424 | ccw = SET_FIELD(ccw, CCW_CT, nx842_ct); | |
425 | ccw = SET_FIELD(ccw, CCW_CI_842, 0); /* use 0 for hw auto-selection */ | |
426 | ccw = SET_FIELD(ccw, CCW_FC_842, fc); | |
427 | ||
428 | /* set up CRB's CSB addr */ | |
429 | csb_addr = nx842_get_pa(csb) & CRB_CSB_ADDRESS; | |
430 | csb_addr |= CRB_CSB_AT; /* Addrs are phys */ | |
431 | crb->csb_addr = cpu_to_be64(csb_addr); | |
432 | ||
433 | wmem->start = ktime_get(); | |
434 | ||
435 | /* do ICSWX */ | |
436 | ret = icswx(cpu_to_be32(ccw), crb); | |
437 | ||
438 | pr_debug_ratelimited("icswx CR %x ccw %x crb->ccw %x\n", ret, | |
439 | (unsigned int)ccw, | |
440 | (unsigned int)be32_to_cpu(crb->ccw)); | |
441 | ||
442 | switch (ret) { | |
443 | case ICSWX_INITIATED: | |
444 | ret = wait_for_csb(wmem, csb); | |
445 | break; | |
446 | case ICSWX_BUSY: | |
447 | pr_debug_ratelimited("842 Coprocessor busy\n"); | |
448 | ret = -EBUSY; | |
449 | break; | |
450 | case ICSWX_REJECTED: | |
451 | pr_err_ratelimited("ICSWX rejected\n"); | |
452 | ret = -EPROTO; | |
453 | break; | |
454 | default: | |
455 | pr_err_ratelimited("Invalid ICSWX return code %x\n", ret); | |
456 | ret = -EPROTO; | |
457 | break; | |
458 | } | |
459 | ||
460 | if (!ret) | |
461 | *outlenp = be32_to_cpu(csb->count); | |
462 | ||
463 | return ret; | |
464 | } | |
465 | ||
466 | /** | |
467 | * nx842_powernv_compress - Compress data using the 842 algorithm | |
468 | * | |
469 | * Compression provided by the NX842 coprocessor on IBM PowerNV systems. | |
470 | * The input buffer is compressed and the result is stored in the | |
471 | * provided output buffer. | |
472 | * | |
473 | * Upon return from this function @outlen contains the length of the | |
474 | * compressed data. If there is an error then @outlen will be 0 and an | |
475 | * error will be specified by the return code from this function. | |
476 | * | |
477 | * @in: input buffer pointer | |
478 | * @inlen: input buffer size | |
479 | * @out: output buffer pointer | |
480 | * @outlenp: output buffer size pointer | |
2c6f6eab DS |
481 | * @workmem: working memory buffer pointer, size determined by |
482 | * nx842_powernv_driver.workmem_size | |
99182a42 DS |
483 | * |
484 | * Returns: see @nx842_powernv_function() | |
485 | */ | |
486 | static int nx842_powernv_compress(const unsigned char *in, unsigned int inlen, | |
487 | unsigned char *out, unsigned int *outlenp, | |
488 | void *wmem) | |
489 | { | |
490 | return nx842_powernv_function(in, inlen, out, outlenp, | |
491 | wmem, CCW_FC_842_COMP_NOCRC); | |
492 | } | |
493 | ||
494 | /** | |
495 | * nx842_powernv_decompress - Decompress data using the 842 algorithm | |
496 | * | |
497 | * Decompression provided by the NX842 coprocessor on IBM PowerNV systems. | |
498 | * The input buffer is decompressed and the result is stored in the | |
499 | * provided output buffer. | |
500 | * | |
501 | * Upon return from this function @outlen contains the length of the | |
502 | * decompressed data. If there is an error then @outlen will be 0 and an | |
503 | * error will be specified by the return code from this function. | |
504 | * | |
505 | * @in: input buffer pointer | |
506 | * @inlen: input buffer size | |
507 | * @out: output buffer pointer | |
508 | * @outlenp: output buffer size pointer | |
2c6f6eab DS |
509 | * @workmem: working memory buffer pointer, size determined by |
510 | * nx842_powernv_driver.workmem_size | |
99182a42 DS |
511 | * |
512 | * Returns: see @nx842_powernv_function() | |
513 | */ | |
514 | static int nx842_powernv_decompress(const unsigned char *in, unsigned int inlen, | |
515 | unsigned char *out, unsigned int *outlenp, | |
516 | void *wmem) | |
517 | { | |
518 | return nx842_powernv_function(in, inlen, out, outlenp, | |
519 | wmem, CCW_FC_842_DECOMP_NOCRC); | |
520 | } | |
521 | ||
522 | static int __init nx842_powernv_probe(struct device_node *dn) | |
523 | { | |
524 | struct nx842_coproc *coproc; | |
525 | struct property *ct_prop, *ci_prop; | |
526 | unsigned int ct, ci; | |
527 | int chip_id; | |
528 | ||
529 | chip_id = of_get_ibm_chip_id(dn); | |
530 | if (chip_id < 0) { | |
531 | pr_err("ibm,chip-id missing\n"); | |
532 | return -EINVAL; | |
533 | } | |
534 | ct_prop = of_find_property(dn, "ibm,842-coprocessor-type", NULL); | |
535 | if (!ct_prop) { | |
536 | pr_err("ibm,842-coprocessor-type missing\n"); | |
537 | return -EINVAL; | |
538 | } | |
539 | ct = be32_to_cpu(*(unsigned int *)ct_prop->value); | |
540 | ci_prop = of_find_property(dn, "ibm,842-coprocessor-instance", NULL); | |
541 | if (!ci_prop) { | |
542 | pr_err("ibm,842-coprocessor-instance missing\n"); | |
543 | return -EINVAL; | |
544 | } | |
545 | ci = be32_to_cpu(*(unsigned int *)ci_prop->value); | |
546 | ||
547 | coproc = kmalloc(sizeof(*coproc), GFP_KERNEL); | |
548 | if (!coproc) | |
549 | return -ENOMEM; | |
550 | ||
551 | coproc->chip_id = chip_id; | |
552 | coproc->ct = ct; | |
553 | coproc->ci = ci; | |
554 | INIT_LIST_HEAD(&coproc->list); | |
555 | list_add(&coproc->list, &nx842_coprocs); | |
556 | ||
557 | pr_info("coprocessor found on chip %d, CT %d CI %d\n", chip_id, ct, ci); | |
558 | ||
559 | if (!nx842_ct) | |
560 | nx842_ct = ct; | |
561 | else if (nx842_ct != ct) | |
562 | pr_err("NX842 chip %d, CT %d != first found CT %d\n", | |
563 | chip_id, ct, nx842_ct); | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
568 | static struct nx842_constraints nx842_powernv_constraints = { | |
569 | .alignment = DDE_BUFFER_ALIGN, | |
570 | .multiple = DDE_BUFFER_LAST_MULT, | |
571 | .minimum = DDE_BUFFER_LAST_MULT, | |
572 | .maximum = (DDL_LEN_MAX - 1) * PAGE_SIZE, | |
573 | }; | |
574 | ||
575 | static struct nx842_driver nx842_powernv_driver = { | |
3e648cbe | 576 | .name = KBUILD_MODNAME, |
99182a42 | 577 | .owner = THIS_MODULE, |
2c6f6eab | 578 | .workmem_size = sizeof(struct nx842_workmem), |
99182a42 DS |
579 | .constraints = &nx842_powernv_constraints, |
580 | .compress = nx842_powernv_compress, | |
581 | .decompress = nx842_powernv_decompress, | |
582 | }; | |
583 | ||
584 | static __init int nx842_powernv_init(void) | |
585 | { | |
586 | struct device_node *dn; | |
587 | ||
588 | /* verify workmem size/align restrictions */ | |
99182a42 DS |
589 | BUILD_BUG_ON(WORKMEM_ALIGN % CRB_ALIGN); |
590 | BUILD_BUG_ON(CRB_ALIGN % DDE_ALIGN); | |
591 | BUILD_BUG_ON(CRB_SIZE % DDE_ALIGN); | |
592 | /* verify buffer size/align restrictions */ | |
593 | BUILD_BUG_ON(PAGE_SIZE % DDE_BUFFER_ALIGN); | |
594 | BUILD_BUG_ON(DDE_BUFFER_ALIGN % DDE_BUFFER_SIZE_MULT); | |
595 | BUILD_BUG_ON(DDE_BUFFER_SIZE_MULT % DDE_BUFFER_LAST_MULT); | |
596 | ||
3e648cbe | 597 | for_each_compatible_node(dn, NULL, "ibm,power-nx") |
99182a42 DS |
598 | nx842_powernv_probe(dn); |
599 | ||
2b93f7ee | 600 | if (!nx842_ct) |
99182a42 | 601 | return -ENODEV; |
99182a42 | 602 | |
3e648cbe DS |
603 | if (!nx842_platform_driver_set(&nx842_powernv_driver)) { |
604 | struct nx842_coproc *coproc, *n; | |
605 | ||
606 | list_for_each_entry_safe(coproc, n, &nx842_coprocs, list) { | |
607 | list_del(&coproc->list); | |
608 | kfree(coproc); | |
609 | } | |
610 | ||
611 | return -EEXIST; | |
612 | } | |
99182a42 | 613 | |
99182a42 DS |
614 | return 0; |
615 | } | |
616 | module_init(nx842_powernv_init); | |
617 | ||
618 | static void __exit nx842_powernv_exit(void) | |
619 | { | |
620 | struct nx842_coproc *coproc, *n; | |
621 | ||
3e648cbe | 622 | nx842_platform_driver_unset(&nx842_powernv_driver); |
99182a42 DS |
623 | |
624 | list_for_each_entry_safe(coproc, n, &nx842_coprocs, list) { | |
625 | list_del(&coproc->list); | |
626 | kfree(coproc); | |
627 | } | |
99182a42 DS |
628 | } |
629 | module_exit(nx842_powernv_exit); |