summaryrefslogtreecommitdiff
path: root/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c')
-rw-r--r--drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c438
1 files changed, 438 insertions, 0 deletions
diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
new file mode 100644
index 000000000000..37d0b6c386a0
--- /dev/null
+++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
@@ -0,0 +1,438 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * sun8i-ce-cipher.c - hardware cryptographic offloader for
+ * Allwinner H3/A64/H5/H2+/H6/R40 SoC
+ *
+ * Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com>
+ *
+ * This file add support for AES cipher with 128,192,256 bits keysize in
+ * CBC and ECB mode.
+ *
+ * You could find a link for the datasheet in Documentation/arm/sunxi/README
+ */
+
+#include <linux/crypto.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/pm_runtime.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/internal/des.h>
+#include <crypto/internal/skcipher.h>
+#include "sun8i-ce.h"
+
+static int sun8i_ce_cipher_need_fallback(struct skcipher_request *areq)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
+ struct scatterlist *sg;
+
+ if (sg_nents(areq->src) > MAX_SG || sg_nents(areq->dst) > MAX_SG)
+ return true;
+
+ if (areq->cryptlen < crypto_skcipher_ivsize(tfm))
+ return true;
+
+ if (areq->cryptlen == 0 || areq->cryptlen % 16)
+ return true;
+
+ sg = areq->src;
+ while (sg) {
+ if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32)))
+ return true;
+ sg = sg_next(sg);
+ }
+ sg = areq->dst;
+ while (sg) {
+ if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32)))
+ return true;
+ sg = sg_next(sg);
+ }
+ return false;
+}
+
+static int sun8i_ce_cipher_fallback(struct skcipher_request *areq)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
+ struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
+ int err;
+#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
+ struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+ struct sun8i_ce_alg_template *algt;
+#endif
+ SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, op->fallback_tfm);
+
+#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
+ algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
+ algt->stat_fb++;
+#endif
+
+ skcipher_request_set_sync_tfm(subreq, op->fallback_tfm);
+ skcipher_request_set_callback(subreq, areq->base.flags, NULL, NULL);
+ skcipher_request_set_crypt(subreq, areq->src, areq->dst,
+ areq->cryptlen, areq->iv);
+ if (rctx->op_dir & CE_DECRYPTION)
+ err = crypto_skcipher_decrypt(subreq);
+ else
+ err = crypto_skcipher_encrypt(subreq);
+ skcipher_request_zero(subreq);
+ return err;
+}
+
+static int sun8i_ce_cipher(struct skcipher_request *areq)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
+ struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct sun8i_ce_dev *ce = op->ce;
+ struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
+ struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+ struct sun8i_ce_alg_template *algt;
+ struct sun8i_ce_flow *chan;
+ struct ce_task *cet;
+ struct scatterlist *sg;
+ unsigned int todo, len, offset, ivsize;
+ dma_addr_t addr_iv = 0, addr_key = 0;
+ void *backup_iv = NULL;
+ u32 common, sym;
+ int flow, i;
+ int nr_sgs = 0;
+ int nr_sgd = 0;
+ int err = 0;
+
+ algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
+
+ dev_dbg(ce->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__,
+ crypto_tfm_alg_name(areq->base.tfm),
+ areq->cryptlen,
+ rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm),
+ op->keylen);
+
+#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
+ algt->stat_req++;
+#endif
+
+ flow = rctx->flow;
+
+ chan = &ce->chanlist[flow];
+
+ cet = chan->tl;
+ memset(cet, 0, sizeof(struct ce_task));
+
+ cet->t_id = cpu_to_le32(flow);
+ common = ce->variant->alg_cipher[algt->ce_algo_id];
+ common |= rctx->op_dir | CE_COMM_INT;
+ cet->t_common_ctl = cpu_to_le32(common);
+ /* CTS and recent CE (H6) need length in bytes, in word otherwise */
+ if (ce->variant->has_t_dlen_in_bytes)
+ cet->t_dlen = cpu_to_le32(areq->cryptlen);
+ else
+ cet->t_dlen = cpu_to_le32(areq->cryptlen / 4);
+
+ sym = ce->variant->op_mode[algt->ce_blockmode];
+ len = op->keylen;
+ switch (len) {
+ case 128 / 8:
+ sym |= CE_AES_128BITS;
+ break;
+ case 192 / 8:
+ sym |= CE_AES_192BITS;
+ break;
+ case 256 / 8:
+ sym |= CE_AES_256BITS;
+ break;
+ }
+
+ cet->t_sym_ctl = cpu_to_le32(sym);
+ cet->t_asym_ctl = 0;
+
+ chan->op_mode = ce->variant->op_mode[algt->ce_blockmode];
+ chan->op_dir = rctx->op_dir;
+ chan->method = ce->variant->alg_cipher[algt->ce_algo_id];
+ chan->keylen = op->keylen;
+
+ addr_key = dma_map_single(ce->dev, op->key, op->keylen, DMA_TO_DEVICE);
+ cet->t_key = cpu_to_le32(addr_key);
+ if (dma_mapping_error(ce->dev, addr_key)) {
+ dev_err(ce->dev, "Cannot DMA MAP KEY\n");
+ err = -EFAULT;
+ goto theend;
+ }
+
+ ivsize = crypto_skcipher_ivsize(tfm);
+ if (areq->iv && crypto_skcipher_ivsize(tfm) > 0) {
+ chan->ivlen = ivsize;
+ chan->bounce_iv = kzalloc(ivsize, GFP_KERNEL | GFP_DMA);
+ if (!chan->bounce_iv) {
+ err = -ENOMEM;
+ goto theend_key;
+ }
+ if (rctx->op_dir & CE_DECRYPTION) {
+ backup_iv = kzalloc(ivsize, GFP_KERNEL);
+ if (!backup_iv) {
+ err = -ENOMEM;
+ goto theend_key;
+ }
+ offset = areq->cryptlen - ivsize;
+ scatterwalk_map_and_copy(backup_iv, areq->src, offset,
+ ivsize, 0);
+ }
+ memcpy(chan->bounce_iv, areq->iv, ivsize);
+ addr_iv = dma_map_single(ce->dev, chan->bounce_iv, chan->ivlen,
+ DMA_TO_DEVICE);
+ cet->t_iv = cpu_to_le32(addr_iv);
+ if (dma_mapping_error(ce->dev, addr_iv)) {
+ dev_err(ce->dev, "Cannot DMA MAP IV\n");
+ err = -ENOMEM;
+ goto theend_iv;
+ }
+ }
+
+ if (areq->src == areq->dst) {
+ nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src),
+ DMA_BIDIRECTIONAL);
+ if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
+ dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
+ err = -EINVAL;
+ goto theend_iv;
+ }
+ nr_sgd = nr_sgs;
+ } else {
+ nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src),
+ DMA_TO_DEVICE);
+ if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
+ dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
+ err = -EINVAL;
+ goto theend_iv;
+ }
+ nr_sgd = dma_map_sg(ce->dev, areq->dst, sg_nents(areq->dst),
+ DMA_FROM_DEVICE);
+ if (nr_sgd <= 0 || nr_sgd > MAX_SG) {
+ dev_err(ce->dev, "Invalid sg number %d\n", nr_sgd);
+ err = -EINVAL;
+ goto theend_sgs;
+ }
+ }
+
+ len = areq->cryptlen;
+ for_each_sg(areq->src, sg, nr_sgs, i) {
+ cet->t_src[i].addr = cpu_to_le32(sg_dma_address(sg));
+ todo = min(len, sg_dma_len(sg));
+ cet->t_src[i].len = cpu_to_le32(todo / 4);
+ dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__,
+ areq->cryptlen, i, cet->t_src[i].len, sg->offset, todo);
+ len -= todo;
+ }
+ if (len > 0) {
+ dev_err(ce->dev, "remaining len %d\n", len);
+ err = -EINVAL;
+ goto theend_sgs;
+ }
+
+ len = areq->cryptlen;
+ for_each_sg(areq->dst, sg, nr_sgd, i) {
+ cet->t_dst[i].addr = cpu_to_le32(sg_dma_address(sg));
+ todo = min(len, sg_dma_len(sg));
+ cet->t_dst[i].len = cpu_to_le32(todo / 4);
+ dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__,
+ areq->cryptlen, i, cet->t_dst[i].len, sg->offset, todo);
+ len -= todo;
+ }
+ if (len > 0) {
+ dev_err(ce->dev, "remaining len %d\n", len);
+ err = -EINVAL;
+ goto theend_sgs;
+ }
+
+ chan->timeout = areq->cryptlen;
+ err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(areq->base.tfm));
+
+theend_sgs:
+ if (areq->src == areq->dst) {
+ dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL);
+ } else {
+ if (nr_sgs > 0)
+ dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_TO_DEVICE);
+ dma_unmap_sg(ce->dev, areq->dst, nr_sgd, DMA_FROM_DEVICE);
+ }
+
+theend_iv:
+ if (areq->iv && ivsize > 0) {
+ if (addr_iv)
+ dma_unmap_single(ce->dev, addr_iv, chan->ivlen,
+ DMA_TO_DEVICE);
+ offset = areq->cryptlen - ivsize;
+ if (rctx->op_dir & CE_DECRYPTION) {
+ memcpy(areq->iv, backup_iv, ivsize);
+ kzfree(backup_iv);
+ } else {
+ scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
+ ivsize, 0);
+ }
+ kfree(chan->bounce_iv);
+ }
+
+theend_key:
+ dma_unmap_single(ce->dev, addr_key, op->keylen, DMA_TO_DEVICE);
+
+theend:
+ return err;
+}
+
+static int sun8i_ce_handle_cipher_request(struct crypto_engine *engine, void *areq)
+{
+ int err;
+ struct skcipher_request *breq = container_of(areq, struct skcipher_request, base);
+
+ err = sun8i_ce_cipher(breq);
+ crypto_finalize_skcipher_request(engine, breq, err);
+
+ return 0;
+}
+
+int sun8i_ce_skdecrypt(struct skcipher_request *areq)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
+ struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
+ struct crypto_engine *engine;
+ int e;
+
+ rctx->op_dir = CE_DECRYPTION;
+ if (sun8i_ce_cipher_need_fallback(areq))
+ return sun8i_ce_cipher_fallback(areq);
+
+ e = sun8i_ce_get_engine_number(op->ce);
+ rctx->flow = e;
+ engine = op->ce->chanlist[e].engine;
+
+ return crypto_transfer_skcipher_request_to_engine(engine, areq);
+}
+
+int sun8i_ce_skencrypt(struct skcipher_request *areq)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
+ struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
+ struct crypto_engine *engine;
+ int e;
+
+ rctx->op_dir = CE_ENCRYPTION;
+ if (sun8i_ce_cipher_need_fallback(areq))
+ return sun8i_ce_cipher_fallback(areq);
+
+ e = sun8i_ce_get_engine_number(op->ce);
+ rctx->flow = e;
+ engine = op->ce->chanlist[e].engine;
+
+ return crypto_transfer_skcipher_request_to_engine(engine, areq);
+}
+
+int sun8i_ce_cipher_init(struct crypto_tfm *tfm)
+{
+ struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
+ struct sun8i_ce_alg_template *algt;
+ const char *name = crypto_tfm_alg_name(tfm);
+ struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm);
+ struct skcipher_alg *alg = crypto_skcipher_alg(sktfm);
+ int err;
+
+ memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx));
+
+ algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
+ op->ce = algt->ce;
+
+ sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx);
+
+ op->fallback_tfm = crypto_alloc_sync_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
+ if (IS_ERR(op->fallback_tfm)) {
+ dev_err(op->ce->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
+ name, PTR_ERR(op->fallback_tfm));
+ return PTR_ERR(op->fallback_tfm);
+ }
+
+ dev_info(op->ce->dev, "Fallback for %s is %s\n",
+ crypto_tfm_alg_driver_name(&sktfm->base),
+ crypto_tfm_alg_driver_name(crypto_skcipher_tfm(&op->fallback_tfm->base)));
+
+ op->enginectx.op.do_one_request = sun8i_ce_handle_cipher_request;
+ op->enginectx.op.prepare_request = NULL;
+ op->enginectx.op.unprepare_request = NULL;
+
+ err = pm_runtime_get_sync(op->ce->dev);
+ if (err < 0)
+ goto error_pm;
+
+ return 0;
+error_pm:
+ crypto_free_sync_skcipher(op->fallback_tfm);
+ return err;
+}
+
+void sun8i_ce_cipher_exit(struct crypto_tfm *tfm)
+{
+ struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
+
+ if (op->key) {
+ memzero_explicit(op->key, op->keylen);
+ kfree(op->key);
+ }
+ crypto_free_sync_skcipher(op->fallback_tfm);
+ pm_runtime_put_sync_suspend(op->ce->dev);
+}
+
+int sun8i_ce_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct sun8i_ce_dev *ce = op->ce;
+
+ switch (keylen) {
+ case 128 / 8:
+ break;
+ case 192 / 8:
+ break;
+ case 256 / 8:
+ break;
+ default:
+ dev_dbg(ce->dev, "ERROR: Invalid keylen %u\n", keylen);
+ crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ return -EINVAL;
+ }
+ if (op->key) {
+ memzero_explicit(op->key, op->keylen);
+ kfree(op->key);
+ }
+ op->keylen = keylen;
+ op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
+ if (!op->key)
+ return -ENOMEM;
+
+ crypto_sync_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
+ crypto_sync_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
+
+ return crypto_sync_skcipher_setkey(op->fallback_tfm, key, keylen);
+}
+
+int sun8i_ce_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ int err;
+
+ err = verify_skcipher_des3_key(tfm, key);
+ if (err)
+ return err;
+
+ if (op->key) {
+ memzero_explicit(op->key, op->keylen);
+ kfree(op->key);
+ }
+ op->keylen = keylen;
+ op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
+ if (!op->key)
+ return -ENOMEM;
+
+ crypto_sync_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
+ crypto_sync_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
+
+ return crypto_sync_skcipher_setkey(op->fallback_tfm, key, keylen);
+}