1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Support for Marvell's Cryptographic Engine and Security Accelerator (CESA)
4 * that can be found on the following platform: Orion, Kirkwood, Armada. This
5 * driver supports the TDMA engine on platforms on which it is available.
6 *
7 * Author: Boris Brezillon <boris.brezillon@free-electrons.com>
8 * Author: Arnaud Ebalard <arno@natisbad.org>
9 *
10 * This work is based on an initial version written by
11 * Sebastian Andrzej Siewior < sebastian at breakpoint dot cc >
12 */
13
14 #include <linux/delay.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/genalloc.h>
17 #include <linux/interrupt.h>
18 #include <linux/io.h>
19 #include <linux/kthread.h>
20 #include <linux/mbus.h>
21 #include <linux/platform_device.h>
22 #include <linux/scatterlist.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/clk.h>
26 #include <linux/of.h>
27 #include <linux/of_platform.h>
28 #include <linux/of_irq.h>
29
30 #include "cesa.h"
31
32 /* Limit of the crypto queue before reaching the backlog */
33 #define CESA_CRYPTO_DEFAULT_MAX_QLEN 128
34
35 struct mv_cesa_dev *cesa_dev;
36
37 struct crypto_async_request *
mv_cesa_dequeue_req_locked(struct mv_cesa_engine * engine,struct crypto_async_request ** backlog)38 mv_cesa_dequeue_req_locked(struct mv_cesa_engine *engine,
39 struct crypto_async_request **backlog)
40 {
41 struct crypto_async_request *req;
42
43 *backlog = crypto_get_backlog(&engine->queue);
44 req = crypto_dequeue_request(&engine->queue);
45
46 if (!req)
47 return NULL;
48
49 return req;
50 }
51
mv_cesa_rearm_engine(struct mv_cesa_engine * engine)52 static void mv_cesa_rearm_engine(struct mv_cesa_engine *engine)
53 {
54 struct crypto_async_request *req = NULL, *backlog = NULL;
55 struct mv_cesa_ctx *ctx;
56
57
58 spin_lock_bh(&engine->lock);
59 if (!engine->req) {
60 req = mv_cesa_dequeue_req_locked(engine, &backlog);
61 engine->req = req;
62 }
63 spin_unlock_bh(&engine->lock);
64
65 if (!req)
66 return;
67
68 if (backlog)
69 backlog->complete(backlog, -EINPROGRESS);
70
71 ctx = crypto_tfm_ctx(req->tfm);
72 ctx->ops->step(req);
73 }
74
mv_cesa_std_process(struct mv_cesa_engine * engine,u32 status)75 static int mv_cesa_std_process(struct mv_cesa_engine *engine, u32 status)
76 {
77 struct crypto_async_request *req;
78 struct mv_cesa_ctx *ctx;
79 int res;
80
81 req = engine->req;
82 ctx = crypto_tfm_ctx(req->tfm);
83 res = ctx->ops->process(req, status);
84
85 if (res == 0) {
86 ctx->ops->complete(req);
87 mv_cesa_engine_enqueue_complete_request(engine, req);
88 } else if (res == -EINPROGRESS) {
89 ctx->ops->step(req);
90 }
91
92 return res;
93 }
94
mv_cesa_int_process(struct mv_cesa_engine * engine,u32 status)95 static int mv_cesa_int_process(struct mv_cesa_engine *engine, u32 status)
96 {
97 if (engine->chain.first && engine->chain.last)
98 return mv_cesa_tdma_process(engine, status);
99
100 return mv_cesa_std_process(engine, status);
101 }
102
103 static inline void
mv_cesa_complete_req(struct mv_cesa_ctx * ctx,struct crypto_async_request * req,int res)104 mv_cesa_complete_req(struct mv_cesa_ctx *ctx, struct crypto_async_request *req,
105 int res)
106 {
107 ctx->ops->cleanup(req);
108 local_bh_disable();
109 req->complete(req, res);
110 local_bh_enable();
111 }
112
mv_cesa_int(int irq,void * priv)113 static irqreturn_t mv_cesa_int(int irq, void *priv)
114 {
115 struct mv_cesa_engine *engine = priv;
116 struct crypto_async_request *req;
117 struct mv_cesa_ctx *ctx;
118 u32 status, mask;
119 irqreturn_t ret = IRQ_NONE;
120
121 while (true) {
122 int res;
123
124 mask = mv_cesa_get_int_mask(engine);
125 status = readl(engine->regs + CESA_SA_INT_STATUS);
126
127 if (!(status & mask))
128 break;
129
130 /*
131 * TODO: avoid clearing the FPGA_INT_STATUS if this not
132 * relevant on some platforms.
133 */
134 writel(~status, engine->regs + CESA_SA_FPGA_INT_STATUS);
135 writel(~status, engine->regs + CESA_SA_INT_STATUS);
136
137 /* Process fetched requests */
138 res = mv_cesa_int_process(engine, status & mask);
139 ret = IRQ_HANDLED;
140
141 spin_lock_bh(&engine->lock);
142 req = engine->req;
143 if (res != -EINPROGRESS)
144 engine->req = NULL;
145 spin_unlock_bh(&engine->lock);
146
147 ctx = crypto_tfm_ctx(req->tfm);
148
149 if (res && res != -EINPROGRESS)
150 mv_cesa_complete_req(ctx, req, res);
151
152 /* Launch the next pending request */
153 mv_cesa_rearm_engine(engine);
154
155 /* Iterate over the complete queue */
156 while (true) {
157 req = mv_cesa_engine_dequeue_complete_request(engine);
158 if (!req)
159 break;
160
161 ctx = crypto_tfm_ctx(req->tfm);
162 mv_cesa_complete_req(ctx, req, 0);
163 }
164 }
165
166 return ret;
167 }
168
mv_cesa_queue_req(struct crypto_async_request * req,struct mv_cesa_req * creq)169 int mv_cesa_queue_req(struct crypto_async_request *req,
170 struct mv_cesa_req *creq)
171 {
172 int ret;
173 struct mv_cesa_engine *engine = creq->engine;
174
175 spin_lock_bh(&engine->lock);
176 ret = crypto_enqueue_request(&engine->queue, req);
177 if ((mv_cesa_req_get_type(creq) == CESA_DMA_REQ) &&
178 (ret == -EINPROGRESS || ret == -EBUSY))
179 mv_cesa_tdma_chain(engine, creq);
180 spin_unlock_bh(&engine->lock);
181
182 if (ret != -EINPROGRESS)
183 return ret;
184
185 mv_cesa_rearm_engine(engine);
186
187 return -EINPROGRESS;
188 }
189
mv_cesa_add_algs(struct mv_cesa_dev * cesa)190 static int mv_cesa_add_algs(struct mv_cesa_dev *cesa)
191 {
192 int ret;
193 int i, j;
194
195 for (i = 0; i < cesa->caps->ncipher_algs; i++) {
196 ret = crypto_register_skcipher(cesa->caps->cipher_algs[i]);
197 if (ret)
198 goto err_unregister_crypto;
199 }
200
201 for (i = 0; i < cesa->caps->nahash_algs; i++) {
202 ret = crypto_register_ahash(cesa->caps->ahash_algs[i]);
203 if (ret)
204 goto err_unregister_ahash;
205 }
206
207 return 0;
208
209 err_unregister_ahash:
210 for (j = 0; j < i; j++)
211 crypto_unregister_ahash(cesa->caps->ahash_algs[j]);
212 i = cesa->caps->ncipher_algs;
213
214 err_unregister_crypto:
215 for (j = 0; j < i; j++)
216 crypto_unregister_skcipher(cesa->caps->cipher_algs[j]);
217
218 return ret;
219 }
220
mv_cesa_remove_algs(struct mv_cesa_dev * cesa)221 static void mv_cesa_remove_algs(struct mv_cesa_dev *cesa)
222 {
223 int i;
224
225 for (i = 0; i < cesa->caps->nahash_algs; i++)
226 crypto_unregister_ahash(cesa->caps->ahash_algs[i]);
227
228 for (i = 0; i < cesa->caps->ncipher_algs; i++)
229 crypto_unregister_skcipher(cesa->caps->cipher_algs[i]);
230 }
231
232 static struct skcipher_alg *orion_cipher_algs[] = {
233 &mv_cesa_ecb_des_alg,
234 &mv_cesa_cbc_des_alg,
235 &mv_cesa_ecb_des3_ede_alg,
236 &mv_cesa_cbc_des3_ede_alg,
237 &mv_cesa_ecb_aes_alg,
238 &mv_cesa_cbc_aes_alg,
239 };
240
241 static struct ahash_alg *orion_ahash_algs[] = {
242 &mv_md5_alg,
243 &mv_sha1_alg,
244 &mv_ahmac_md5_alg,
245 &mv_ahmac_sha1_alg,
246 };
247
248 static struct skcipher_alg *armada_370_cipher_algs[] = {
249 &mv_cesa_ecb_des_alg,
250 &mv_cesa_cbc_des_alg,
251 &mv_cesa_ecb_des3_ede_alg,
252 &mv_cesa_cbc_des3_ede_alg,
253 &mv_cesa_ecb_aes_alg,
254 &mv_cesa_cbc_aes_alg,
255 };
256
257 static struct ahash_alg *armada_370_ahash_algs[] = {
258 &mv_md5_alg,
259 &mv_sha1_alg,
260 &mv_sha256_alg,
261 &mv_ahmac_md5_alg,
262 &mv_ahmac_sha1_alg,
263 &mv_ahmac_sha256_alg,
264 };
265
266 static const struct mv_cesa_caps orion_caps = {
267 .nengines = 1,
268 .cipher_algs = orion_cipher_algs,
269 .ncipher_algs = ARRAY_SIZE(orion_cipher_algs),
270 .ahash_algs = orion_ahash_algs,
271 .nahash_algs = ARRAY_SIZE(orion_ahash_algs),
272 .has_tdma = false,
273 };
274
275 static const struct mv_cesa_caps kirkwood_caps = {
276 .nengines = 1,
277 .cipher_algs = orion_cipher_algs,
278 .ncipher_algs = ARRAY_SIZE(orion_cipher_algs),
279 .ahash_algs = orion_ahash_algs,
280 .nahash_algs = ARRAY_SIZE(orion_ahash_algs),
281 .has_tdma = true,
282 };
283
284 static const struct mv_cesa_caps armada_370_caps = {
285 .nengines = 1,
286 .cipher_algs = armada_370_cipher_algs,
287 .ncipher_algs = ARRAY_SIZE(armada_370_cipher_algs),
288 .ahash_algs = armada_370_ahash_algs,
289 .nahash_algs = ARRAY_SIZE(armada_370_ahash_algs),
290 .has_tdma = true,
291 };
292
293 static const struct mv_cesa_caps armada_xp_caps = {
294 .nengines = 2,
295 .cipher_algs = armada_370_cipher_algs,
296 .ncipher_algs = ARRAY_SIZE(armada_370_cipher_algs),
297 .ahash_algs = armada_370_ahash_algs,
298 .nahash_algs = ARRAY_SIZE(armada_370_ahash_algs),
299 .has_tdma = true,
300 };
301
302 static const struct of_device_id mv_cesa_of_match_table[] = {
303 { .compatible = "marvell,orion-crypto", .data = &orion_caps },
304 { .compatible = "marvell,kirkwood-crypto", .data = &kirkwood_caps },
305 { .compatible = "marvell,dove-crypto", .data = &kirkwood_caps },
306 { .compatible = "marvell,armada-370-crypto", .data = &armada_370_caps },
307 { .compatible = "marvell,armada-xp-crypto", .data = &armada_xp_caps },
308 { .compatible = "marvell,armada-375-crypto", .data = &armada_xp_caps },
309 { .compatible = "marvell,armada-38x-crypto", .data = &armada_xp_caps },
310 {}
311 };
312 MODULE_DEVICE_TABLE(of, mv_cesa_of_match_table);
313
314 static void
mv_cesa_conf_mbus_windows(struct mv_cesa_engine * engine,const struct mbus_dram_target_info * dram)315 mv_cesa_conf_mbus_windows(struct mv_cesa_engine *engine,
316 const struct mbus_dram_target_info *dram)
317 {
318 void __iomem *iobase = engine->regs;
319 int i;
320
321 for (i = 0; i < 4; i++) {
322 writel(0, iobase + CESA_TDMA_WINDOW_CTRL(i));
323 writel(0, iobase + CESA_TDMA_WINDOW_BASE(i));
324 }
325
326 for (i = 0; i < dram->num_cs; i++) {
327 const struct mbus_dram_window *cs = dram->cs + i;
328
329 writel(((cs->size - 1) & 0xffff0000) |
330 (cs->mbus_attr << 8) |
331 (dram->mbus_dram_target_id << 4) | 1,
332 iobase + CESA_TDMA_WINDOW_CTRL(i));
333 writel(cs->base, iobase + CESA_TDMA_WINDOW_BASE(i));
334 }
335 }
336
mv_cesa_dev_dma_init(struct mv_cesa_dev * cesa)337 static int mv_cesa_dev_dma_init(struct mv_cesa_dev *cesa)
338 {
339 struct device *dev = cesa->dev;
340 struct mv_cesa_dev_dma *dma;
341
342 if (!cesa->caps->has_tdma)
343 return 0;
344
345 dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
346 if (!dma)
347 return -ENOMEM;
348
349 dma->tdma_desc_pool = dmam_pool_create("tdma_desc", dev,
350 sizeof(struct mv_cesa_tdma_desc),
351 16, 0);
352 if (!dma->tdma_desc_pool)
353 return -ENOMEM;
354
355 dma->op_pool = dmam_pool_create("cesa_op", dev,
356 sizeof(struct mv_cesa_op_ctx), 16, 0);
357 if (!dma->op_pool)
358 return -ENOMEM;
359
360 dma->cache_pool = dmam_pool_create("cesa_cache", dev,
361 CESA_MAX_HASH_BLOCK_SIZE, 1, 0);
362 if (!dma->cache_pool)
363 return -ENOMEM;
364
365 dma->padding_pool = dmam_pool_create("cesa_padding", dev, 72, 1, 0);
366 if (!dma->padding_pool)
367 return -ENOMEM;
368
369 cesa->dma = dma;
370
371 return 0;
372 }
373
mv_cesa_get_sram(struct platform_device * pdev,int idx)374 static int mv_cesa_get_sram(struct platform_device *pdev, int idx)
375 {
376 struct mv_cesa_dev *cesa = platform_get_drvdata(pdev);
377 struct mv_cesa_engine *engine = &cesa->engines[idx];
378 const char *res_name = "sram";
379 struct resource *res;
380
381 engine->pool = of_gen_pool_get(cesa->dev->of_node,
382 "marvell,crypto-srams", idx);
383 if (engine->pool) {
384 engine->sram_pool = gen_pool_dma_alloc(engine->pool,
385 cesa->sram_size,
386 &engine->sram_dma);
387 if (engine->sram_pool)
388 return 0;
389
390 engine->pool = NULL;
391 return -ENOMEM;
392 }
393
394 if (cesa->caps->nengines > 1) {
395 if (!idx)
396 res_name = "sram0";
397 else
398 res_name = "sram1";
399 }
400
401 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
402 res_name);
403 if (!res || resource_size(res) < cesa->sram_size)
404 return -EINVAL;
405
406 engine->sram = devm_ioremap_resource(cesa->dev, res);
407 if (IS_ERR(engine->sram))
408 return PTR_ERR(engine->sram);
409
410 engine->sram_dma = dma_map_resource(cesa->dev, res->start,
411 cesa->sram_size,
412 DMA_BIDIRECTIONAL, 0);
413 if (dma_mapping_error(cesa->dev, engine->sram_dma))
414 return -ENOMEM;
415
416 return 0;
417 }
418
mv_cesa_put_sram(struct platform_device * pdev,int idx)419 static void mv_cesa_put_sram(struct platform_device *pdev, int idx)
420 {
421 struct mv_cesa_dev *cesa = platform_get_drvdata(pdev);
422 struct mv_cesa_engine *engine = &cesa->engines[idx];
423
424 if (engine->pool)
425 gen_pool_free(engine->pool, (unsigned long)engine->sram_pool,
426 cesa->sram_size);
427 else
428 dma_unmap_resource(cesa->dev, engine->sram_dma,
429 cesa->sram_size, DMA_BIDIRECTIONAL, 0);
430 }
431
mv_cesa_probe(struct platform_device * pdev)432 static int mv_cesa_probe(struct platform_device *pdev)
433 {
434 const struct mv_cesa_caps *caps = &orion_caps;
435 const struct mbus_dram_target_info *dram;
436 const struct of_device_id *match;
437 struct device *dev = &pdev->dev;
438 struct mv_cesa_dev *cesa;
439 struct mv_cesa_engine *engines;
440 int irq, ret, i, cpu;
441 u32 sram_size;
442
443 if (cesa_dev) {
444 dev_err(&pdev->dev, "Only one CESA device authorized\n");
445 return -EEXIST;
446 }
447
448 if (dev->of_node) {
449 match = of_match_node(mv_cesa_of_match_table, dev->of_node);
450 if (!match || !match->data)
451 return -ENOTSUPP;
452
453 caps = match->data;
454 }
455
456 cesa = devm_kzalloc(dev, sizeof(*cesa), GFP_KERNEL);
457 if (!cesa)
458 return -ENOMEM;
459
460 cesa->caps = caps;
461 cesa->dev = dev;
462
463 sram_size = CESA_SA_DEFAULT_SRAM_SIZE;
464 of_property_read_u32(cesa->dev->of_node, "marvell,crypto-sram-size",
465 &sram_size);
466 if (sram_size < CESA_SA_MIN_SRAM_SIZE)
467 sram_size = CESA_SA_MIN_SRAM_SIZE;
468
469 cesa->sram_size = sram_size;
470 cesa->engines = devm_kcalloc(dev, caps->nengines, sizeof(*engines),
471 GFP_KERNEL);
472 if (!cesa->engines)
473 return -ENOMEM;
474
475 spin_lock_init(&cesa->lock);
476
477 cesa->regs = devm_platform_ioremap_resource_byname(pdev, "regs");
478 if (IS_ERR(cesa->regs))
479 return PTR_ERR(cesa->regs);
480
481 ret = mv_cesa_dev_dma_init(cesa);
482 if (ret)
483 return ret;
484
485 dram = mv_mbus_dram_info_nooverlap();
486
487 platform_set_drvdata(pdev, cesa);
488
489 for (i = 0; i < caps->nengines; i++) {
490 struct mv_cesa_engine *engine = &cesa->engines[i];
491 char res_name[7];
492
493 engine->id = i;
494 spin_lock_init(&engine->lock);
495
496 ret = mv_cesa_get_sram(pdev, i);
497 if (ret)
498 goto err_cleanup;
499
500 irq = platform_get_irq(pdev, i);
501 if (irq < 0) {
502 ret = irq;
503 goto err_cleanup;
504 }
505
506 engine->irq = irq;
507
508 /*
509 * Not all platforms can gate the CESA clocks: do not complain
510 * if the clock does not exist.
511 */
512 snprintf(res_name, sizeof(res_name), "cesa%d", i);
513 engine->clk = devm_clk_get(dev, res_name);
514 if (IS_ERR(engine->clk)) {
515 engine->clk = devm_clk_get(dev, NULL);
516 if (IS_ERR(engine->clk))
517 engine->clk = NULL;
518 }
519
520 snprintf(res_name, sizeof(res_name), "cesaz%d", i);
521 engine->zclk = devm_clk_get(dev, res_name);
522 if (IS_ERR(engine->zclk))
523 engine->zclk = NULL;
524
525 ret = clk_prepare_enable(engine->clk);
526 if (ret)
527 goto err_cleanup;
528
529 ret = clk_prepare_enable(engine->zclk);
530 if (ret)
531 goto err_cleanup;
532
533 engine->regs = cesa->regs + CESA_ENGINE_OFF(i);
534
535 if (dram && cesa->caps->has_tdma)
536 mv_cesa_conf_mbus_windows(engine, dram);
537
538 writel(0, engine->regs + CESA_SA_INT_STATUS);
539 writel(CESA_SA_CFG_STOP_DIG_ERR,
540 engine->regs + CESA_SA_CFG);
541 writel(engine->sram_dma & CESA_SA_SRAM_MSK,
542 engine->regs + CESA_SA_DESC_P0);
543
544 ret = devm_request_threaded_irq(dev, irq, NULL, mv_cesa_int,
545 IRQF_ONESHOT,
546 dev_name(&pdev->dev),
547 engine);
548 if (ret)
549 goto err_cleanup;
550
551 /* Set affinity */
552 cpu = cpumask_local_spread(engine->id, NUMA_NO_NODE);
553 irq_set_affinity_hint(irq, get_cpu_mask(cpu));
554
555 crypto_init_queue(&engine->queue, CESA_CRYPTO_DEFAULT_MAX_QLEN);
556 atomic_set(&engine->load, 0);
557 INIT_LIST_HEAD(&engine->complete_queue);
558 }
559
560 cesa_dev = cesa;
561
562 ret = mv_cesa_add_algs(cesa);
563 if (ret) {
564 cesa_dev = NULL;
565 goto err_cleanup;
566 }
567
568 dev_info(dev, "CESA device successfully registered\n");
569
570 return 0;
571
572 err_cleanup:
573 for (i = 0; i < caps->nengines; i++) {
574 clk_disable_unprepare(cesa->engines[i].zclk);
575 clk_disable_unprepare(cesa->engines[i].clk);
576 mv_cesa_put_sram(pdev, i);
577 if (cesa->engines[i].irq > 0)
578 irq_set_affinity_hint(cesa->engines[i].irq, NULL);
579 }
580
581 return ret;
582 }
583
mv_cesa_remove(struct platform_device * pdev)584 static int mv_cesa_remove(struct platform_device *pdev)
585 {
586 struct mv_cesa_dev *cesa = platform_get_drvdata(pdev);
587 int i;
588
589 mv_cesa_remove_algs(cesa);
590
591 for (i = 0; i < cesa->caps->nengines; i++) {
592 clk_disable_unprepare(cesa->engines[i].zclk);
593 clk_disable_unprepare(cesa->engines[i].clk);
594 mv_cesa_put_sram(pdev, i);
595 irq_set_affinity_hint(cesa->engines[i].irq, NULL);
596 }
597
598 return 0;
599 }
600
601 static const struct platform_device_id mv_cesa_plat_id_table[] = {
602 { .name = "mv_crypto" },
603 { /* sentinel */ },
604 };
605 MODULE_DEVICE_TABLE(platform, mv_cesa_plat_id_table);
606
607 static struct platform_driver marvell_cesa = {
608 .probe = mv_cesa_probe,
609 .remove = mv_cesa_remove,
610 .id_table = mv_cesa_plat_id_table,
611 .driver = {
612 .name = "marvell-cesa",
613 .of_match_table = mv_cesa_of_match_table,
614 },
615 };
616 module_platform_driver(marvell_cesa);
617
618 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
619 MODULE_AUTHOR("Arnaud Ebalard <arno@natisbad.org>");
620 MODULE_DESCRIPTION("Support for Marvell's cryptographic engine");
621 MODULE_LICENSE("GPL v2");
622
