1 // SPDX-License-Identifier: GPL-2.0
3 * sun8i-ce-cipher.c - hardware cryptographic offloader for
4 * Allwinner H3/A64/H5/H2+/H6/R40 SoC
6 * Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com>
8 * This file add support for AES cipher with 128,192,256 bits keysize in
11 * You could find a link for the datasheet in Documentation/arm/sunxi.rst
14 #include <linux/crypto.h>
15 #include <linux/dma-mapping.h>
17 #include <linux/pm_runtime.h>
18 #include <crypto/scatterwalk.h>
19 #include <crypto/internal/des.h>
20 #include <crypto/internal/skcipher.h>
23 static int sun8i_ce_cipher_need_fallback(struct skcipher_request *areq)
25 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
26 struct scatterlist *sg;
28 if (sg_nents(areq->src) > MAX_SG || sg_nents(areq->dst) > MAX_SG)
31 if (areq->cryptlen < crypto_skcipher_ivsize(tfm))
34 if (areq->cryptlen == 0 || areq->cryptlen % 16)
39 if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32)))
45 if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32)))
52 static int sun8i_ce_cipher_fallback(struct skcipher_request *areq)
54 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
55 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
56 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
58 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
59 struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
60 struct sun8i_ce_alg_template *algt;
62 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
66 skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
67 skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
68 areq->base.complete, areq->base.data);
69 skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
70 areq->cryptlen, areq->iv);
71 if (rctx->op_dir & CE_DECRYPTION)
72 err = crypto_skcipher_decrypt(&rctx->fallback_req);
74 err = crypto_skcipher_encrypt(&rctx->fallback_req);
78 static int sun8i_ce_cipher(struct skcipher_request *areq)
80 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
81 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
82 struct sun8i_ce_dev *ce = op->ce;
83 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
84 struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
85 struct sun8i_ce_alg_template *algt;
86 struct sun8i_ce_flow *chan;
88 struct scatterlist *sg;
89 unsigned int todo, len, offset, ivsize;
90 dma_addr_t addr_iv = 0, addr_key = 0;
91 void *backup_iv = NULL;
98 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
100 dev_dbg(ce->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__,
101 crypto_tfm_alg_name(areq->base.tfm),
103 rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm),
106 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
112 chan = &ce->chanlist[flow];
115 memset(cet, 0, sizeof(struct ce_task));
117 cet->t_id = cpu_to_le32(flow);
118 common = ce->variant->alg_cipher[algt->ce_algo_id];
119 common |= rctx->op_dir | CE_COMM_INT;
120 cet->t_common_ctl = cpu_to_le32(common);
121 /* CTS and recent CE (H6) need length in bytes, in word otherwise */
122 if (ce->variant->has_t_dlen_in_bytes)
123 cet->t_dlen = cpu_to_le32(areq->cryptlen);
125 cet->t_dlen = cpu_to_le32(areq->cryptlen / 4);
127 sym = ce->variant->op_mode[algt->ce_blockmode];
131 sym |= CE_AES_128BITS;
134 sym |= CE_AES_192BITS;
137 sym |= CE_AES_256BITS;
141 cet->t_sym_ctl = cpu_to_le32(sym);
144 addr_key = dma_map_single(ce->dev, op->key, op->keylen, DMA_TO_DEVICE);
145 cet->t_key = cpu_to_le32(addr_key);
146 if (dma_mapping_error(ce->dev, addr_key)) {
147 dev_err(ce->dev, "Cannot DMA MAP KEY\n");
152 ivsize = crypto_skcipher_ivsize(tfm);
153 if (areq->iv && crypto_skcipher_ivsize(tfm) > 0) {
154 chan->ivlen = ivsize;
155 chan->bounce_iv = kzalloc(ivsize, GFP_KERNEL | GFP_DMA);
156 if (!chan->bounce_iv) {
160 if (rctx->op_dir & CE_DECRYPTION) {
161 backup_iv = kzalloc(ivsize, GFP_KERNEL);
166 offset = areq->cryptlen - ivsize;
167 scatterwalk_map_and_copy(backup_iv, areq->src, offset,
170 memcpy(chan->bounce_iv, areq->iv, ivsize);
171 addr_iv = dma_map_single(ce->dev, chan->bounce_iv, chan->ivlen,
173 cet->t_iv = cpu_to_le32(addr_iv);
174 if (dma_mapping_error(ce->dev, addr_iv)) {
175 dev_err(ce->dev, "Cannot DMA MAP IV\n");
181 if (areq->src == areq->dst) {
182 nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src),
184 if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
185 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
191 nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src),
193 if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
194 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
198 nr_sgd = dma_map_sg(ce->dev, areq->dst, sg_nents(areq->dst),
200 if (nr_sgd <= 0 || nr_sgd > MAX_SG) {
201 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgd);
207 len = areq->cryptlen;
208 for_each_sg(areq->src, sg, nr_sgs, i) {
209 cet->t_src[i].addr = cpu_to_le32(sg_dma_address(sg));
210 todo = min(len, sg_dma_len(sg));
211 cet->t_src[i].len = cpu_to_le32(todo / 4);
212 dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__,
213 areq->cryptlen, i, cet->t_src[i].len, sg->offset, todo);
217 dev_err(ce->dev, "remaining len %d\n", len);
222 len = areq->cryptlen;
223 for_each_sg(areq->dst, sg, nr_sgd, i) {
224 cet->t_dst[i].addr = cpu_to_le32(sg_dma_address(sg));
225 todo = min(len, sg_dma_len(sg));
226 cet->t_dst[i].len = cpu_to_le32(todo / 4);
227 dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__,
228 areq->cryptlen, i, cet->t_dst[i].len, sg->offset, todo);
232 dev_err(ce->dev, "remaining len %d\n", len);
237 chan->timeout = areq->cryptlen;
238 err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(areq->base.tfm));
241 if (areq->src == areq->dst) {
242 dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL);
245 dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_TO_DEVICE);
246 dma_unmap_sg(ce->dev, areq->dst, nr_sgd, DMA_FROM_DEVICE);
250 if (areq->iv && ivsize > 0) {
252 dma_unmap_single(ce->dev, addr_iv, chan->ivlen,
254 offset = areq->cryptlen - ivsize;
255 if (rctx->op_dir & CE_DECRYPTION) {
256 memcpy(areq->iv, backup_iv, ivsize);
259 scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
262 kfree(chan->bounce_iv);
266 dma_unmap_single(ce->dev, addr_key, op->keylen, DMA_TO_DEVICE);
272 static int sun8i_ce_handle_cipher_request(struct crypto_engine *engine, void *areq)
275 struct skcipher_request *breq = container_of(areq, struct skcipher_request, base);
277 err = sun8i_ce_cipher(breq);
278 crypto_finalize_skcipher_request(engine, breq, err);
283 int sun8i_ce_skdecrypt(struct skcipher_request *areq)
285 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
286 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
287 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
288 struct crypto_engine *engine;
291 rctx->op_dir = CE_DECRYPTION;
292 if (sun8i_ce_cipher_need_fallback(areq))
293 return sun8i_ce_cipher_fallback(areq);
295 e = sun8i_ce_get_engine_number(op->ce);
297 engine = op->ce->chanlist[e].engine;
299 return crypto_transfer_skcipher_request_to_engine(engine, areq);
302 int sun8i_ce_skencrypt(struct skcipher_request *areq)
304 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
305 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
306 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
307 struct crypto_engine *engine;
310 rctx->op_dir = CE_ENCRYPTION;
311 if (sun8i_ce_cipher_need_fallback(areq))
312 return sun8i_ce_cipher_fallback(areq);
314 e = sun8i_ce_get_engine_number(op->ce);
316 engine = op->ce->chanlist[e].engine;
318 return crypto_transfer_skcipher_request_to_engine(engine, areq);
321 int sun8i_ce_cipher_init(struct crypto_tfm *tfm)
323 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
324 struct sun8i_ce_alg_template *algt;
325 const char *name = crypto_tfm_alg_name(tfm);
326 struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm);
327 struct skcipher_alg *alg = crypto_skcipher_alg(sktfm);
330 memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx));
332 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
335 op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
336 if (IS_ERR(op->fallback_tfm)) {
337 dev_err(op->ce->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
338 name, PTR_ERR(op->fallback_tfm));
339 return PTR_ERR(op->fallback_tfm);
342 sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx) +
343 crypto_skcipher_reqsize(op->fallback_tfm);
346 dev_info(op->ce->dev, "Fallback for %s is %s\n",
347 crypto_tfm_alg_driver_name(&sktfm->base),
348 crypto_tfm_alg_driver_name(crypto_skcipher_tfm(op->fallback_tfm)));
350 op->enginectx.op.do_one_request = sun8i_ce_handle_cipher_request;
351 op->enginectx.op.prepare_request = NULL;
352 op->enginectx.op.unprepare_request = NULL;
354 err = pm_runtime_get_sync(op->ce->dev);
360 pm_runtime_put_noidle(op->ce->dev);
361 crypto_free_skcipher(op->fallback_tfm);
365 void sun8i_ce_cipher_exit(struct crypto_tfm *tfm)
367 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
370 memzero_explicit(op->key, op->keylen);
373 crypto_free_skcipher(op->fallback_tfm);
374 pm_runtime_put_sync_suspend(op->ce->dev);
377 int sun8i_ce_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
380 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
381 struct sun8i_ce_dev *ce = op->ce;
391 dev_dbg(ce->dev, "ERROR: Invalid keylen %u\n", keylen);
395 memzero_explicit(op->key, op->keylen);
399 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
403 crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
404 crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
406 return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
409 int sun8i_ce_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
412 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
415 err = verify_skcipher_des3_key(tfm, key);
420 memzero_explicit(op->key, op->keylen);
424 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
428 crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
429 crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
431 return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);