Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1217 insertions, 0 deletions

diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c
new file mode 100644
index 000000000..51b48b572
--- /dev/null
+++ b/drivers/crypto/caam/caampkc.c
@@ -0,0 +1,1217 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * caam - Freescale FSL CAAM support for Public Key Cryptography
+ *
+ * Copyright 2016 Freescale Semiconductor, Inc.
+ * Copyright 2018-2019 NXP
+ *
+ * There is no Shared Descriptor for PKC so that the Job Descriptor must carry
+ * all the desired key parameters, input and output pointers.
+ */
+#include "compat.h"
+#include "regs.h"
+#include "intern.h"
+#include "jr.h"
+#include "error.h"
+#include "desc_constr.h"
+#include "sg_sw_sec4.h"
+#include "caampkc.h"
+
+#define DESC_RSA_PUB_LEN	(2 * CAAM_CMD_SZ + SIZEOF_RSA_PUB_PDB)
+#define DESC_RSA_PRIV_F1_LEN	(2 * CAAM_CMD_SZ + \
+				 SIZEOF_RSA_PRIV_F1_PDB)
+#define DESC_RSA_PRIV_F2_LEN	(2 * CAAM_CMD_SZ + \
+				 SIZEOF_RSA_PRIV_F2_PDB)
+#define DESC_RSA_PRIV_F3_LEN	(2 * CAAM_CMD_SZ + \
+				 SIZEOF_RSA_PRIV_F3_PDB)
+#define CAAM_RSA_MAX_INPUT_SIZE	512 /* for a 4096-bit modulus */
+
+/* buffer filled with zeros, used for padding */
+static u8 *zero_buffer;
+
+/*
+ * variable used to avoid double free of resources in case
+ * algorithm registration was unsuccessful
+ */
+static bool init_done;
+
+struct caam_akcipher_alg {
+	struct akcipher_alg akcipher;
+	bool registered;
+};
+
+static void rsa_io_unmap(struct device *dev, struct rsa_edesc *edesc,
+			 struct akcipher_request *req)
+{
+	struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+
+	dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
+	dma_unmap_sg(dev, req_ctx->fixup_src, edesc->src_nents, DMA_TO_DEVICE);
+
+	if (edesc->sec4_sg_bytes)
+		dma_unmap_single(dev, edesc->sec4_sg_dma, edesc->sec4_sg_bytes,
+				 DMA_TO_DEVICE);
+}
+
+static void rsa_pub_unmap(struct device *dev, struct rsa_edesc *edesc,
+			  struct akcipher_request *req)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+	struct rsa_pub_pdb *pdb = &edesc->pdb.pub;
+
+	dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->e_dma, key->e_sz, DMA_TO_DEVICE);
+}
+
+static void rsa_priv_f1_unmap(struct device *dev, struct rsa_edesc *edesc,
+			      struct akcipher_request *req)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+	struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1;
+
+	dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
+}
+
+static void rsa_priv_f2_unmap(struct device *dev, struct rsa_edesc *edesc,
+			      struct akcipher_request *req)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+	struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2;
+	size_t p_sz = key->p_sz;
+	size_t q_sz = key->q_sz;
+
+	dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
+	dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL);
+}
+
+static void rsa_priv_f3_unmap(struct device *dev, struct rsa_edesc *edesc,
+			      struct akcipher_request *req)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+	struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3;
+	size_t p_sz = key->p_sz;
+	size_t q_sz = key->q_sz;
+
+	dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
+	dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL);
+}
+
+/* RSA Job Completion handler */
+static void rsa_pub_done(struct device *dev, u32 *desc, u32 err, void *context)
+{
+	struct akcipher_request *req = context;
+	struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+	struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
+	struct rsa_edesc *edesc;
+	int ecode = 0;
+	bool has_bklog;
+
+	if (err)
+		ecode = caam_jr_strstatus(dev, err);
+
+	edesc = req_ctx->edesc;
+	has_bklog = edesc->bklog;
+
+	rsa_pub_unmap(dev, edesc, req);
+	rsa_io_unmap(dev, edesc, req);
+	kfree(edesc);
+
+	/*
+	 * If no backlog flag, the completion of the request is done
+	 * by CAAM, not crypto engine.
+	 */
+	if (!has_bklog)
+		akcipher_request_complete(req, ecode);
+	else
+		crypto_finalize_akcipher_request(jrp->engine, req, ecode);
+}
+
+static void rsa_priv_f_done(struct device *dev, u32 *desc, u32 err,
+			    void *context)
+{
+	struct akcipher_request *req = context;
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+	struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+	struct rsa_edesc *edesc;
+	int ecode = 0;
+	bool has_bklog;
+
+	if (err)
+		ecode = caam_jr_strstatus(dev, err);
+
+	edesc = req_ctx->edesc;
+	has_bklog = edesc->bklog;
+
+	switch (key->priv_form) {
+	case FORM1:
+		rsa_priv_f1_unmap(dev, edesc, req);
+		break;
+	case FORM2:
+		rsa_priv_f2_unmap(dev, edesc, req);
+		break;
+	case FORM3:
+		rsa_priv_f3_unmap(dev, edesc, req);
+	}
+
+	rsa_io_unmap(dev, edesc, req);
+	kfree(edesc);
+
+	/*
+	 * If no backlog flag, the completion of the request is done
+	 * by CAAM, not crypto engine.
+	 */
+	if (!has_bklog)
+		akcipher_request_complete(req, ecode);
+	else
+		crypto_finalize_akcipher_request(jrp->engine, req, ecode);
+}
+
+/**
+ * caam_rsa_count_leading_zeros - Count leading zeros, need it to strip,
+ *                                from a given scatterlist
+ *
+ * @sgl   : scatterlist to count zeros from
+ * @nbytes: number of zeros, in bytes, to strip
+ * @flags : operation flags
+ */
+static int caam_rsa_count_leading_zeros(struct scatterlist *sgl,
+					unsigned int nbytes,
+					unsigned int flags)
+{
+	struct sg_mapping_iter miter;
+	int lzeros, ents;
+	unsigned int len;
+	unsigned int tbytes = nbytes;
+	const u8 *buff;
+
+	ents = sg_nents_for_len(sgl, nbytes);
+	if (ents < 0)
+		return ents;
+
+	sg_miter_start(&miter, sgl, ents, SG_MITER_FROM_SG | flags);
+
+	lzeros = 0;
+	len = 0;
+	while (nbytes > 0) {
+		/* do not strip more than given bytes */
+		while (len && !*buff && lzeros < nbytes) {
+			lzeros++;
+			len--;
+			buff++;
+		}
+
+		if (len && *buff)
+			break;
+
+		if (!sg_miter_next(&miter))
+			break;
+
+		buff = miter.addr;
+		len = miter.length;
+
+		nbytes -= lzeros;
+		lzeros = 0;
+	}
+
+	miter.consumed = lzeros;
+	sg_miter_stop(&miter);
+	nbytes -= lzeros;
+
+	return tbytes - nbytes;
+}
+
+static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
+					 size_t desclen)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct device *dev = ctx->dev;
+	struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+	struct caam_rsa_key *key = &ctx->key;
+	struct rsa_edesc *edesc;
+	gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
+		       GFP_KERNEL : GFP_ATOMIC;
+	int sg_flags = (flags == GFP_ATOMIC) ? SG_MITER_ATOMIC : 0;
+	int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;
+	int src_nents, dst_nents;
+	int mapped_src_nents, mapped_dst_nents;
+	unsigned int diff_size = 0;
+	int lzeros;
+
+	if (req->src_len > key->n_sz) {
+		/*
+		 * strip leading zeros and
+		 * return the number of zeros to skip
+		 */
+		lzeros = caam_rsa_count_leading_zeros(req->src, req->src_len -
+						      key->n_sz, sg_flags);
+		if (lzeros < 0)
+			return ERR_PTR(lzeros);
+
+		req_ctx->fixup_src = scatterwalk_ffwd(req_ctx->src, req->src,
+						      lzeros);
+		req_ctx->fixup_src_len = req->src_len - lzeros;
+	} else {
+		/*
+		 * input src is less then n key modulus,
+		 * so there will be zero padding
+		 */
+		diff_size = key->n_sz - req->src_len;
+		req_ctx->fixup_src = req->src;
+		req_ctx->fixup_src_len = req->src_len;
+	}
+
+	src_nents = sg_nents_for_len(req_ctx->fixup_src,
+				     req_ctx->fixup_src_len);
+	dst_nents = sg_nents_for_len(req->dst, req->dst_len);
+
+	mapped_src_nents = dma_map_sg(dev, req_ctx->fixup_src, src_nents,
+				      DMA_TO_DEVICE);
+	if (unlikely(!mapped_src_nents)) {
+		dev_err(dev, "unable to map source\n");
+		return ERR_PTR(-ENOMEM);
+	}
+	mapped_dst_nents = dma_map_sg(dev, req->dst, dst_nents,
+				      DMA_FROM_DEVICE);
+	if (unlikely(!mapped_dst_nents)) {
+		dev_err(dev, "unable to map destination\n");
+		goto src_fail;
+	}
+
+	if (!diff_size && mapped_src_nents == 1)
+		sec4_sg_len = 0; /* no need for an input hw s/g table */
+	else
+		sec4_sg_len = mapped_src_nents + !!diff_size;
+	sec4_sg_index = sec4_sg_len;
+
+	if (mapped_dst_nents > 1)
+		sec4_sg_len += pad_sg_nents(mapped_dst_nents);
+	else
+		sec4_sg_len = pad_sg_nents(sec4_sg_len);
+
+	sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry);
+
+	/* allocate space for base edesc, hw desc commands and link tables */
+	edesc = kzalloc(sizeof(*edesc) + desclen + sec4_sg_bytes,
+			GFP_DMA | flags);
+	if (!edesc)
+		goto dst_fail;
+
+	edesc->sec4_sg = (void *)edesc + sizeof(*edesc) + desclen;
+	if (diff_size)
+		dma_to_sec4_sg_one(edesc->sec4_sg, ctx->padding_dma, diff_size,
+				   0);
+
+	if (sec4_sg_index)
+		sg_to_sec4_sg_last(req_ctx->fixup_src, req_ctx->fixup_src_len,
+				   edesc->sec4_sg + !!diff_size, 0);
+
+	if (mapped_dst_nents > 1)
+		sg_to_sec4_sg_last(req->dst, req->dst_len,
+				   edesc->sec4_sg + sec4_sg_index, 0);
+
+	/* Save nents for later use in Job Descriptor */
+	edesc->src_nents = src_nents;
+	edesc->dst_nents = dst_nents;
+
+	req_ctx->edesc = edesc;
+
+	if (!sec4_sg_bytes)
+		return edesc;
+
+	edesc->mapped_src_nents = mapped_src_nents;
+	edesc->mapped_dst_nents = mapped_dst_nents;
+
+	edesc->sec4_sg_dma = dma_map_single(dev, edesc->sec4_sg,
+					    sec4_sg_bytes, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, edesc->sec4_sg_dma)) {
+		dev_err(dev, "unable to map S/G table\n");
+		goto sec4_sg_fail;
+	}
+
+	edesc->sec4_sg_bytes = sec4_sg_bytes;
+
+	print_hex_dump_debug("caampkc sec4_sg@" __stringify(__LINE__) ": ",
+			     DUMP_PREFIX_ADDRESS, 16, 4, edesc->sec4_sg,
+			     edesc->sec4_sg_bytes, 1);
+
+	return edesc;
+
+sec4_sg_fail:
+	kfree(edesc);
+dst_fail:
+	dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
+src_fail:
+	dma_unmap_sg(dev, req_ctx->fixup_src, src_nents, DMA_TO_DEVICE);
+	return ERR_PTR(-ENOMEM);
+}
+
+static int akcipher_do_one_req(struct crypto_engine *engine, void *areq)
+{
+	struct akcipher_request *req = container_of(areq,
+						    struct akcipher_request,
+						    base);
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct device *jrdev = ctx->dev;
+	u32 *desc = req_ctx->edesc->hw_desc;
+	int ret;
+
+	req_ctx->edesc->bklog = true;
+
+	ret = caam_jr_enqueue(jrdev, desc, req_ctx->akcipher_op_done, req);
+
+	if (ret == -ENOSPC && engine->retry_support)
+		return ret;
+
+	if (ret != -EINPROGRESS) {
+		rsa_pub_unmap(jrdev, req_ctx->edesc, req);
+		rsa_io_unmap(jrdev, req_ctx->edesc, req);
+		kfree(req_ctx->edesc);
+	} else {
+		ret = 0;
+	}
+
+	return ret;
+}
+
+static int set_rsa_pub_pdb(struct akcipher_request *req,
+			   struct rsa_edesc *edesc)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+	struct device *dev = ctx->dev;
+	struct rsa_pub_pdb *pdb = &edesc->pdb.pub;
+	int sec4_sg_index = 0;
+
+	pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, pdb->n_dma)) {
+		dev_err(dev, "Unable to map RSA modulus memory\n");
+		return -ENOMEM;
+	}
+
+	pdb->e_dma = dma_map_single(dev, key->e, key->e_sz, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, pdb->e_dma)) {
+		dev_err(dev, "Unable to map RSA public exponent memory\n");
+		dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
+		return -ENOMEM;
+	}
+
+	if (edesc->mapped_src_nents > 1) {
+		pdb->sgf |= RSA_PDB_SGF_F;
+		pdb->f_dma = edesc->sec4_sg_dma;
+		sec4_sg_index += edesc->mapped_src_nents;
+	} else {
+		pdb->f_dma = sg_dma_address(req_ctx->fixup_src);
+	}
+
+	if (edesc->mapped_dst_nents > 1) {
+		pdb->sgf |= RSA_PDB_SGF_G;
+		pdb->g_dma = edesc->sec4_sg_dma +
+			     sec4_sg_index * sizeof(struct sec4_sg_entry);
+	} else {
+		pdb->g_dma = sg_dma_address(req->dst);
+	}
+
+	pdb->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz;
+	pdb->f_len = req_ctx->fixup_src_len;
+
+	return 0;
+}
+
+static int set_rsa_priv_f1_pdb(struct akcipher_request *req,
+			       struct rsa_edesc *edesc)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+	struct device *dev = ctx->dev;
+	struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1;
+	int sec4_sg_index = 0;
+
+	pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, pdb->n_dma)) {
+		dev_err(dev, "Unable to map modulus memory\n");
+		return -ENOMEM;
+	}
+
+	pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, pdb->d_dma)) {
+		dev_err(dev, "Unable to map RSA private exponent memory\n");
+		dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
+		return -ENOMEM;
+	}
+
+	if (edesc->mapped_src_nents > 1) {
+		pdb->sgf |= RSA_PRIV_PDB_SGF_G;
+		pdb->g_dma = edesc->sec4_sg_dma;
+		sec4_sg_index += edesc->mapped_src_nents;
+
+	} else {
+		struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+
+		pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
+	}
+
+	if (edesc->mapped_dst_nents > 1) {
+		pdb->sgf |= RSA_PRIV_PDB_SGF_F;
+		pdb->f_dma = edesc->sec4_sg_dma +
+			     sec4_sg_index * sizeof(struct sec4_sg_entry);
+	} else {
+		pdb->f_dma = sg_dma_address(req->dst);
+	}
+
+	pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
+
+	return 0;
+}
+
+static int set_rsa_priv_f2_pdb(struct akcipher_request *req,
+			       struct rsa_edesc *edesc)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+	struct device *dev = ctx->dev;
+	struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2;
+	int sec4_sg_index = 0;
+	size_t p_sz = key->p_sz;
+	size_t q_sz = key->q_sz;
+
+	pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, pdb->d_dma)) {
+		dev_err(dev, "Unable to map RSA private exponent memory\n");
+		return -ENOMEM;
+	}
+
+	pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, pdb->p_dma)) {
+		dev_err(dev, "Unable to map RSA prime factor p memory\n");
+		goto unmap_d;
+	}
+
+	pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, pdb->q_dma)) {
+		dev_err(dev, "Unable to map RSA prime factor q memory\n");
+		goto unmap_p;
+	}
+
+	pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
+	if (dma_mapping_error(dev, pdb->tmp1_dma)) {
+		dev_err(dev, "Unable to map RSA tmp1 memory\n");
+		goto unmap_q;
+	}
+
+	pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
+	if (dma_mapping_error(dev, pdb->tmp2_dma)) {
+		dev_err(dev, "Unable to map RSA tmp2 memory\n");
+		goto unmap_tmp1;
+	}
+
+	if (edesc->mapped_src_nents > 1) {
+		pdb->sgf |= RSA_PRIV_PDB_SGF_G;
+		pdb->g_dma = edesc->sec4_sg_dma;
+		sec4_sg_index += edesc->mapped_src_nents;
+	} else {
+		struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+
+		pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
+	}
+
+	if (edesc->mapped_dst_nents > 1) {
+		pdb->sgf |= RSA_PRIV_PDB_SGF_F;
+		pdb->f_dma = edesc->sec4_sg_dma +
+			     sec4_sg_index * sizeof(struct sec4_sg_entry);
+	} else {
+		pdb->f_dma = sg_dma_address(req->dst);
+	}
+
+	pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
+	pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
+
+	return 0;
+
+unmap_tmp1:
+	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
+unmap_q:
+	dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
+unmap_p:
+	dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
+unmap_d:
+	dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
+
+	return -ENOMEM;
+}
+
+static int set_rsa_priv_f3_pdb(struct akcipher_request *req,
+			       struct rsa_edesc *edesc)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+	struct device *dev = ctx->dev;
+	struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3;
+	int sec4_sg_index = 0;
+	size_t p_sz = key->p_sz;
+	size_t q_sz = key->q_sz;
+
+	pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, pdb->p_dma)) {
+		dev_err(dev, "Unable to map RSA prime factor p memory\n");
+		return -ENOMEM;
+	}
+
+	pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, pdb->q_dma)) {
+		dev_err(dev, "Unable to map RSA prime factor q memory\n");
+		goto unmap_p;
+	}
+
+	pdb->dp_dma = dma_map_single(dev, key->dp, p_sz, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, pdb->dp_dma)) {
+		dev_err(dev, "Unable to map RSA exponent dp memory\n");
+		goto unmap_q;
+	}
+
+	pdb->dq_dma = dma_map_single(dev, key->dq, q_sz, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, pdb->dq_dma)) {
+		dev_err(dev, "Unable to map RSA exponent dq memory\n");
+		goto unmap_dp;
+	}
+
+	pdb->c_dma = dma_map_single(dev, key->qinv, p_sz, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, pdb->c_dma)) {
+		dev_err(dev, "Unable to map RSA CRT coefficient qinv memory\n");
+		goto unmap_dq;
+	}
+
+	pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
+	if (dma_mapping_error(dev, pdb->tmp1_dma)) {
+		dev_err(dev, "Unable to map RSA tmp1 memory\n");
+		goto unmap_qinv;
+	}
+
+	pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
+	if (dma_mapping_error(dev, pdb->tmp2_dma)) {
+		dev_err(dev, "Unable to map RSA tmp2 memory\n");
+		goto unmap_tmp1;
+	}
+
+	if (edesc->mapped_src_nents > 1) {
+		pdb->sgf |= RSA_PRIV_PDB_SGF_G;
+		pdb->g_dma = edesc->sec4_sg_dma;
+		sec4_sg_index += edesc->mapped_src_nents;
+	} else {
+		struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+
+		pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
+	}
+
+	if (edesc->mapped_dst_nents > 1) {
+		pdb->sgf |= RSA_PRIV_PDB_SGF_F;
+		pdb->f_dma = edesc->sec4_sg_dma +
+			     sec4_sg_index * sizeof(struct sec4_sg_entry);
+	} else {
+		pdb->f_dma = sg_dma_address(req->dst);
+	}
+
+	pdb->sgf |= key->n_sz;
+	pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
+
+	return 0;
+
+unmap_tmp1:
+	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
+unmap_qinv:
+	dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
+unmap_dq:
+	dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
+unmap_dp:
+	dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
+unmap_q:
+	dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
+unmap_p:
+	dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
+
+	return -ENOMEM;
+}
+
+static int akcipher_enqueue_req(struct device *jrdev,
+				void (*cbk)(struct device *jrdev, u32 *desc,
+					    u32 err, void *context),
+				struct akcipher_request *req)
+{
+	struct caam_drv_private_jr *jrpriv = dev_get_drvdata(jrdev);
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+	struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+	struct rsa_edesc *edesc = req_ctx->edesc;
+	u32 *desc = edesc->hw_desc;
+	int ret;
+
+	req_ctx->akcipher_op_done = cbk;
+	/*
+	 * Only the backlog request are sent to crypto-engine since the others
+	 * can be handled by CAAM, if free, especially since JR has up to 1024
+	 * entries (more than the 10 entries from crypto-engine).
+	 */
+	if (req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)
+		ret = crypto_transfer_akcipher_request_to_engine(jrpriv->engine,
+								 req);
+	else
+		ret = caam_jr_enqueue(jrdev, desc, cbk, req);
+
+	if ((ret != -EINPROGRESS) && (ret != -EBUSY)) {
+		switch (key->priv_form) {
+		case FORM1:
+			rsa_priv_f1_unmap(jrdev, edesc, req);
+			break;
+		case FORM2:
+			rsa_priv_f2_unmap(jrdev, edesc, req);
+			break;
+		case FORM3:
+			rsa_priv_f3_unmap(jrdev, edesc, req);
+			break;
+		default:
+			rsa_pub_unmap(jrdev, edesc, req);
+		}
+		rsa_io_unmap(jrdev, edesc, req);
+		kfree(edesc);
+	}
+
+	return ret;
+}
+
+static int caam_rsa_enc(struct akcipher_request *req)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+	struct device *jrdev = ctx->dev;
+	struct rsa_edesc *edesc;
+	int ret;
+
+	if (unlikely(!key->n || !key->e))
+		return -EINVAL;
+
+	if (req->dst_len < key->n_sz) {
+		req->dst_len = key->n_sz;
+		dev_err(jrdev, "Output buffer length less than parameter n\n");
+		return -EOVERFLOW;
+	}
+
+	/* Allocate extended descriptor */
+	edesc = rsa_edesc_alloc(req, DESC_RSA_PUB_LEN);
+	if (IS_ERR(edesc))
+		return PTR_ERR(edesc);
+
+	/* Set RSA Encrypt Protocol Data Block */
+	ret = set_rsa_pub_pdb(req, edesc);
+	if (ret)
+		goto init_fail;
+
+	/* Initialize Job Descriptor */
+	init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub);
+
+	return akcipher_enqueue_req(jrdev, rsa_pub_done, req);
+
+init_fail:
+	rsa_io_unmap(jrdev, edesc, req);
+	kfree(edesc);
+	return ret;
+}
+
+static int caam_rsa_dec_priv_f1(struct akcipher_request *req)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct device *jrdev = ctx->dev;
+	struct rsa_edesc *edesc;
+	int ret;
+
+	/* Allocate extended descriptor */
+	edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F1_LEN);
+	if (IS_ERR(edesc))
+		return PTR_ERR(edesc);
+
+	/* Set RSA Decrypt Protocol Data Block - Private Key Form #1 */
+	ret = set_rsa_priv_f1_pdb(req, edesc);
+	if (ret)
+		goto init_fail;
+
+	/* Initialize Job Descriptor */
+	init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1);
+
+	return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
+
+init_fail:
+	rsa_io_unmap(jrdev, edesc, req);
+	kfree(edesc);
+	return ret;
+}
+
+static int caam_rsa_dec_priv_f2(struct akcipher_request *req)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct device *jrdev = ctx->dev;
+	struct rsa_edesc *edesc;
+	int ret;
+
+	/* Allocate extended descriptor */
+	edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F2_LEN);
+	if (IS_ERR(edesc))
+		return PTR_ERR(edesc);
+
+	/* Set RSA Decrypt Protocol Data Block - Private Key Form #2 */
+	ret = set_rsa_priv_f2_pdb(req, edesc);
+	if (ret)
+		goto init_fail;
+
+	/* Initialize Job Descriptor */
+	init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2);
+
+	return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
+
+init_fail:
+	rsa_io_unmap(jrdev, edesc, req);
+	kfree(edesc);
+	return ret;
+}
+
+static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct device *jrdev = ctx->dev;
+	struct rsa_edesc *edesc;
+	int ret;
+
+	/* Allocate extended descriptor */
+	edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F3_LEN);
+	if (IS_ERR(edesc))
+		return PTR_ERR(edesc);
+
+	/* Set RSA Decrypt Protocol Data Block - Private Key Form #3 */
+	ret = set_rsa_priv_f3_pdb(req, edesc);
+	if (ret)
+		goto init_fail;
+
+	/* Initialize Job Descriptor */
+	init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3);
+
+	return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
+
+init_fail:
+	rsa_io_unmap(jrdev, edesc, req);
+	kfree(edesc);
+	return ret;
+}
+
+static int caam_rsa_dec(struct akcipher_request *req)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+	int ret;
+
+	if (unlikely(!key->n || !key->d))
+		return -EINVAL;
+
+	if (req->dst_len < key->n_sz) {
+		req->dst_len = key->n_sz;
+		dev_err(ctx->dev, "Output buffer length less than parameter n\n");
+		return -EOVERFLOW;
+	}
+
+	if (key->priv_form == FORM3)
+		ret = caam_rsa_dec_priv_f3(req);
+	else if (key->priv_form == FORM2)
+		ret = caam_rsa_dec_priv_f2(req);
+	else
+		ret = caam_rsa_dec_priv_f1(req);
+
+	return ret;
+}
+
+static void caam_rsa_free_key(struct caam_rsa_key *key)
+{
+	kfree_sensitive(key->d);
+	kfree_sensitive(key->p);
+	kfree_sensitive(key->q);
+	kfree_sensitive(key->dp);
+	kfree_sensitive(key->dq);
+	kfree_sensitive(key->qinv);
+	kfree_sensitive(key->tmp1);
+	kfree_sensitive(key->tmp2);
+	kfree(key->e);
+	kfree(key->n);
+	memset(key, 0, sizeof(*key));
+}
+
+static void caam_rsa_drop_leading_zeros(const u8 **ptr, size_t *nbytes)
+{
+	while (!**ptr && *nbytes) {
+		(*ptr)++;
+		(*nbytes)--;
+	}
+}
+
+/**
+ * caam_read_rsa_crt - Used for reading dP, dQ, qInv CRT members.
+ * dP, dQ and qInv could decode to less than corresponding p, q length, as the
+ * BER-encoding requires that the minimum number of bytes be used to encode the
+ * integer. dP, dQ, qInv decoded values have to be zero-padded to appropriate
+ * length.
+ *
+ * @ptr   : pointer to {dP, dQ, qInv} CRT member
+ * @nbytes: length in bytes of {dP, dQ, qInv} CRT member
+ * @dstlen: length in bytes of corresponding p or q prime factor
+ */
+static u8 *caam_read_rsa_crt(const u8 *ptr, size_t nbytes, size_t dstlen)
+{
+	u8 *dst;
+
+	caam_rsa_drop_leading_zeros(&ptr, &nbytes);
+	if (!nbytes)
+		return NULL;
+
+	dst = kzalloc(dstlen, GFP_DMA | GFP_KERNEL);
+	if (!dst)
+		return NULL;
+
+	memcpy(dst + (dstlen - nbytes), ptr, nbytes);
+
+	return dst;
+}
+
+/**
+ * caam_read_raw_data - Read a raw byte stream as a positive integer.
+ * The function skips buffer's leading zeros, copies the remained data
+ * to a buffer allocated in the GFP_DMA | GFP_KERNEL zone and returns
+ * the address of the new buffer.
+ *
+ * @buf   : The data to read
+ * @nbytes: The amount of data to read
+ */
+static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes)
+{
+
+	caam_rsa_drop_leading_zeros(&buf, nbytes);
+	if (!*nbytes)
+		return NULL;
+
+	return kmemdup(buf, *nbytes, GFP_DMA | GFP_KERNEL);
+}
+
+static int caam_rsa_check_key_length(unsigned int len)
+{
+	if (len > 4096)
+		return -EINVAL;
+	return 0;
+}
+
+static int caam_rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key,
+				unsigned int keylen)
+{
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct rsa_key raw_key = {NULL};
+	struct caam_rsa_key *rsa_key = &ctx->key;
+	int ret;
+
+	/* Free the old RSA key if any */
+	caam_rsa_free_key(rsa_key);
+
+	ret = rsa_parse_pub_key(&raw_key, key, keylen);
+	if (ret)
+		return ret;
+
+	/* Copy key in DMA zone */
+	rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_DMA | GFP_KERNEL);
+	if (!rsa_key->e)
+		goto err;
+
+	/*
+	 * Skip leading zeros and copy the positive integer to a buffer
+	 * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor
+	 * expects a positive integer for the RSA modulus and uses its length as
+	 * decryption output length.
+	 */
+	rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
+	if (!rsa_key->n)
+		goto err;
+
+	if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
+		caam_rsa_free_key(rsa_key);
+		return -EINVAL;
+	}
+
+	rsa_key->e_sz = raw_key.e_sz;
+	rsa_key->n_sz = raw_key.n_sz;
+
+	return 0;
+err:
+	caam_rsa_free_key(rsa_key);
+	return -ENOMEM;
+}
+
+static void caam_rsa_set_priv_key_form(struct caam_rsa_ctx *ctx,
+				       struct rsa_key *raw_key)
+{
+	struct caam_rsa_key *rsa_key = &ctx->key;
+	size_t p_sz = raw_key->p_sz;
+	size_t q_sz = raw_key->q_sz;
+
+	rsa_key->p = caam_read_raw_data(raw_key->p, &p_sz);
+	if (!rsa_key->p)
+		return;
+	rsa_key->p_sz = p_sz;
+
+	rsa_key->q = caam_read_raw_data(raw_key->q, &q_sz);
+	if (!rsa_key->q)
+		goto free_p;
+	rsa_key->q_sz = q_sz;
+
+	rsa_key->tmp1 = kzalloc(raw_key->p_sz, GFP_DMA | GFP_KERNEL);
+	if (!rsa_key->tmp1)
+		goto free_q;
+
+	rsa_key->tmp2 = kzalloc(raw_key->q_sz, GFP_DMA | GFP_KERNEL);
+	if (!rsa_key->tmp2)
+		goto free_tmp1;
+
+	rsa_key->priv_form = FORM2;
+
+	rsa_key->dp = caam_read_rsa_crt(raw_key->dp, raw_key->dp_sz, p_sz);
+	if (!rsa_key->dp)
+		goto free_tmp2;
+
+	rsa_key->dq = caam_read_rsa_crt(raw_key->dq, raw_key->dq_sz, q_sz);
+	if (!rsa_key->dq)
+		goto free_dp;
+
+	rsa_key->qinv = caam_read_rsa_crt(raw_key->qinv, raw_key->qinv_sz,
+					  q_sz);
+	if (!rsa_key->qinv)
+		goto free_dq;
+
+	rsa_key->priv_form = FORM3;
+
+	return;
+
+free_dq:
+	kfree_sensitive(rsa_key->dq);
+free_dp:
+	kfree_sensitive(rsa_key->dp);
+free_tmp2:
+	kfree_sensitive(rsa_key->tmp2);
+free_tmp1:
+	kfree_sensitive(rsa_key->tmp1);
+free_q:
+	kfree_sensitive(rsa_key->q);
+free_p:
+	kfree_sensitive(rsa_key->p);
+}
+
+static int caam_rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
+				 unsigned int keylen)
+{
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct rsa_key raw_key = {NULL};
+	struct caam_rsa_key *rsa_key = &ctx->key;
+	int ret;
+
+	/* Free the old RSA key if any */
+	caam_rsa_free_key(rsa_key);
+
+	ret = rsa_parse_priv_key(&raw_key, key, keylen);
+	if (ret)
+		return ret;
+
+	/* Copy key in DMA zone */
+	rsa_key->d = kmemdup(raw_key.d, raw_key.d_sz, GFP_DMA | GFP_KERNEL);
+	if (!rsa_key->d)
+		goto err;
+
+	rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_DMA | GFP_KERNEL);
+	if (!rsa_key->e)
+		goto err;
+
+	/*
+	 * Skip leading zeros and copy the positive integer to a buffer
+	 * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor
+	 * expects a positive integer for the RSA modulus and uses its length as
+	 * decryption output length.
+	 */
+	rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
+	if (!rsa_key->n)
+		goto err;
+
+	if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
+		caam_rsa_free_key(rsa_key);
+		return -EINVAL;
+	}
+
+	rsa_key->d_sz = raw_key.d_sz;
+	rsa_key->e_sz = raw_key.e_sz;
+	rsa_key->n_sz = raw_key.n_sz;
+
+	caam_rsa_set_priv_key_form(ctx, &raw_key);
+
+	return 0;
+
+err:
+	caam_rsa_free_key(rsa_key);
+	return -ENOMEM;
+}
+
+static unsigned int caam_rsa_max_size(struct crypto_akcipher *tfm)
+{
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+
+	return ctx->key.n_sz;
+}
+
+/* Per session pkc's driver context creation function */
+static int caam_rsa_init_tfm(struct crypto_akcipher *tfm)
+{
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+
+	ctx->dev = caam_jr_alloc();
+
+	if (IS_ERR(ctx->dev)) {
+		pr_err("Job Ring Device allocation for transform failed\n");
+		return PTR_ERR(ctx->dev);
+	}
+
+	ctx->padding_dma = dma_map_single(ctx->dev, zero_buffer,
+					  CAAM_RSA_MAX_INPUT_SIZE - 1,
+					  DMA_TO_DEVICE);
+	if (dma_mapping_error(ctx->dev, ctx->padding_dma)) {
+		dev_err(ctx->dev, "unable to map padding\n");
+		caam_jr_free(ctx->dev);
+		return -ENOMEM;
+	}
+
+	ctx->enginectx.op.do_one_request = akcipher_do_one_req;
+
+	return 0;
+}
+
+/* Per session pkc's driver context cleanup function */
+static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm)
+{
+	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct caam_rsa_key *key = &ctx->key;
+
+	dma_unmap_single(ctx->dev, ctx->padding_dma, CAAM_RSA_MAX_INPUT_SIZE -
+			 1, DMA_TO_DEVICE);
+	caam_rsa_free_key(key);
+	caam_jr_free(ctx->dev);
+}
+
+static struct caam_akcipher_alg caam_rsa = {
+	.akcipher = {
+		.encrypt = caam_rsa_enc,
+		.decrypt = caam_rsa_dec,
+		.set_pub_key = caam_rsa_set_pub_key,
+		.set_priv_key = caam_rsa_set_priv_key,
+		.max_size = caam_rsa_max_size,
+		.init = caam_rsa_init_tfm,
+		.exit = caam_rsa_exit_tfm,
+		.reqsize = sizeof(struct caam_rsa_req_ctx),
+		.base = {
+			.cra_name = "rsa",
+			.cra_driver_name = "rsa-caam",
+			.cra_priority = 3000,
+			.cra_module = THIS_MODULE,
+			.cra_ctxsize = sizeof(struct caam_rsa_ctx),
+		},
+	}
+};
+
+/* Public Key Cryptography module initialization handler */
+int caam_pkc_init(struct device *ctrldev)
+{
+	struct caam_drv_private *priv = dev_get_drvdata(ctrldev);
+	u32 pk_inst, pkha;
+	int err;
+	init_done = false;
+
+	/* Determine public key hardware accelerator presence. */
+	if (priv->era < 10) {
+		pk_inst = (rd_reg32(&priv->ctrl->perfmon.cha_num_ls) &
+			   CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT;
+	} else {
+		pkha = rd_reg32(&priv->ctrl->vreg.pkha);
+		pk_inst = pkha & CHA_VER_NUM_MASK;
+
+		/*
+		 * Newer CAAMs support partially disabled functionality. If this is the
+		 * case, the number is non-zero, but this bit is set to indicate that
+		 * no encryption or decryption is supported. Only signing and verifying
+		 * is supported.
+		 */
+		if (pkha & CHA_VER_MISC_PKHA_NO_CRYPT)
+			pk_inst = 0;
+	}
+
+	/* Do not register algorithms if PKHA is not present. */
+	if (!pk_inst)
+		return 0;
+
+	/* allocate zero buffer, used for padding input */
+	zero_buffer = kzalloc(CAAM_RSA_MAX_INPUT_SIZE - 1, GFP_DMA |
+			      GFP_KERNEL);
+	if (!zero_buffer)
+		return -ENOMEM;
+
+	err = crypto_register_akcipher(&caam_rsa.akcipher);
+
+	if (err) {
+		kfree(zero_buffer);
+		dev_warn(ctrldev, "%s alg registration failed\n",
+			 caam_rsa.akcipher.base.cra_driver_name);
+	} else {
+		init_done = true;
+		caam_rsa.registered = true;
+		dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n");
+	}
+
+	return err;
+}
+
+void caam_pkc_exit(void)
+{
+	if (!init_done)
+		return;
+
+	if (caam_rsa.registered)
+		crypto_unregister_akcipher(&caam_rsa.akcipher);
+
+	kfree(zero_buffer);
+}