[linux-block.git] / drivers / crypto / allwinner / sun8i-ce / sun8i-ce-cipher.c

// 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.rst
 */

#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;

	algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
	algt->stat_fb++;
#endif

	skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
	skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
				      areq->base.complete, areq->base.data);
	skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
				   areq->cryptlen, areq->iv);
	if (rctx->op_dir & CE_DECRYPTION)
		err = crypto_skcipher_decrypt(&rctx->fallback_req);
	else
		err = crypto_skcipher_encrypt(&rctx->fallback_req);
	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;

	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);
			kfree_sensitive(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;

	op->fallback_tfm = crypto_alloc_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);
	}

	sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx) +
			 crypto_skcipher_reqsize(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)));

	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:
	pm_runtime_put_noidle(op->ce->dev);
	crypto_free_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_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);
		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_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
	crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);

	return crypto_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_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
	crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);

	return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
}
Commit	Line	Data
06f751b6 CL	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* sun8i-ce-cipher.c - hardware cryptographic offloader for
	4	* Allwinner H3/A64/H5/H2+/H6/R40 SoC
	5	*
	6	* Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com>
	7	*
	8	* This file add support for AES cipher with 128,192,256 bits keysize in
	9	* CBC and ECB mode.
	10	*
3ecad8c2	11	* You could find a link for the datasheet in Documentation/arm/sunxi.rst
06f751b6 CL	12	*/
	13
	14	#include <linux/crypto.h>
	15	#include <linux/dma-mapping.h>
	16	#include <linux/io.h>
	17	#include <linux/pm_runtime.h>
	18	#include <crypto/scatterwalk.h>
	19	#include <crypto/internal/des.h>
	20	#include <crypto/internal/skcipher.h>
	21	#include "sun8i-ce.h"
	22
	23	static int sun8i_ce_cipher_need_fallback(struct skcipher_request *areq)
	24	{
	25	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
	26	struct scatterlist *sg;
	27
	28	if (sg_nents(areq->src) > MAX_SG \|\| sg_nents(areq->dst) > MAX_SG)
	29	return true;
	30
	31	if (areq->cryptlen < crypto_skcipher_ivsize(tfm))
	32	return true;
	33
	34	if (areq->cryptlen == 0 \|\| areq->cryptlen % 16)
	35	return true;
	36
	37	sg = areq->src;
	38	while (sg) {
	39	if (sg->length % 4 \|\| !IS_ALIGNED(sg->offset, sizeof(u32)))
	40	return true;
	41	sg = sg_next(sg);
	42	}
	43	sg = areq->dst;
	44	while (sg) {
	45	if (sg->length % 4 \|\| !IS_ALIGNED(sg->offset, sizeof(u32)))
	46	return true;
	47	sg = sg_next(sg);
	48	}
	49	return false;
	50	}
	51
	52	static int sun8i_ce_cipher_fallback(struct skcipher_request *areq)
	53	{
	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);
	57	int err;
	58	#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
	59	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
	60	struct sun8i_ce_alg_template *algt;
06f751b6	61
06f751b6 CL	62	algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
	63	algt->stat_fb++;
	64	#endif
	65
31abd3eb AB	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,
06f751b6 CL	70	areq->cryptlen, areq->iv);
06f751b6 CL	71	if (rctx->op_dir & CE_DECRYPTION)
31abd3eb	72	err = crypto_skcipher_decrypt(&rctx->fallback_req);
06f751b6	73	else
31abd3eb	74	err = crypto_skcipher_encrypt(&rctx->fallback_req);
06f751b6 CL	75	return err;
	76	}
	77
	78	static int sun8i_ce_cipher(struct skcipher_request *areq)
	79	{
	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;
	87	struct ce_task *cet;
	88	struct scatterlist *sg;
	89	unsigned int todo, len, offset, ivsize;
93c7f4d3	90	dma_addr_t addr_iv = 0, addr_key = 0;
06f751b6	91	void *backup_iv = NULL;
93c7f4d3	92	u32 common, sym;
06f751b6 CL	93	int flow, i;
	94	int nr_sgs = 0;
	95	int nr_sgd = 0;
	96	int err = 0;
	97
	98	algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
	99
	100	dev_dbg(ce->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__,
	101	crypto_tfm_alg_name(areq->base.tfm),
	102	areq->cryptlen,
	103	rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm),
	104	op->keylen);
	105
	106	#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
	107	algt->stat_req++;
	108	#endif
	109
	110	flow = rctx->flow;
	111
	112	chan = &ce->chanlist[flow];
	113
	114	cet = chan->tl;
	115	memset(cet, 0, sizeof(struct ce_task));
	116
93c7f4d3 CL	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);
06f751b6 CL	121	/* CTS and recent CE (H6) need length in bytes, in word otherwise */
06f751b6 CL	122	if (ce->variant->has_t_dlen_in_bytes)
93c7f4d3 CL	123	cet->t_dlen = cpu_to_le32(areq->cryptlen);
	124	else
	125	cet->t_dlen = cpu_to_le32(areq->cryptlen / 4);
06f751b6	126
93c7f4d3	127	sym = ce->variant->op_mode[algt->ce_blockmode];
06f751b6 CL	128	len = op->keylen;
	129	switch (len) {
	130	case 128 / 8:
93c7f4d3	131	sym \|= CE_AES_128BITS;
06f751b6 CL	132	break;
06f751b6 CL	133	case 192 / 8:
93c7f4d3	134	sym \|= CE_AES_192BITS;
06f751b6 CL	135	break;
06f751b6 CL	136	case 256 / 8:
93c7f4d3	137	sym \|= CE_AES_256BITS;
06f751b6 CL	138	break;
	139	}
	140
93c7f4d3	141	cet->t_sym_ctl = cpu_to_le32(sym);
06f751b6 CL	142	cet->t_asym_ctl = 0;
06f751b6 CL	143
93c7f4d3 CL	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)) {
06f751b6 CL	147	dev_err(ce->dev, "Cannot DMA MAP KEY\n");
	148	err = -EFAULT;
	149	goto theend;
	150	}
	151
	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) {
	157	err = -ENOMEM;
	158	goto theend_key;
	159	}
	160	if (rctx->op_dir & CE_DECRYPTION) {
	161	backup_iv = kzalloc(ivsize, GFP_KERNEL);
	162	if (!backup_iv) {
	163	err = -ENOMEM;
	164	goto theend_key;
	165	}
	166	offset = areq->cryptlen - ivsize;
	167	scatterwalk_map_and_copy(backup_iv, areq->src, offset,
	168	ivsize, 0);
	169	}
	170	memcpy(chan->bounce_iv, areq->iv, ivsize);
93c7f4d3 CL	171	addr_iv = dma_map_single(ce->dev, chan->bounce_iv, chan->ivlen,
	172	DMA_TO_DEVICE);
	173	cet->t_iv = cpu_to_le32(addr_iv);
	174	if (dma_mapping_error(ce->dev, addr_iv)) {
06f751b6 CL	175	dev_err(ce->dev, "Cannot DMA MAP IV\n");
	176	err = -ENOMEM;
	177	goto theend_iv;
	178	}
	179	}
	180
	181	if (areq->src == areq->dst) {
	182	nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src),
	183	DMA_BIDIRECTIONAL);
	184	if (nr_sgs <= 0 \|\| nr_sgs > MAX_SG) {
	185	dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
	186	err = -EINVAL;
	187	goto theend_iv;
	188	}
	189	nr_sgd = nr_sgs;
	190	} else {
	191	nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src),
	192	DMA_TO_DEVICE);
	193	if (nr_sgs <= 0 \|\| nr_sgs > MAX_SG) {
	194	dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
	195	err = -EINVAL;
	196	goto theend_iv;
	197	}
	198	nr_sgd = dma_map_sg(ce->dev, areq->dst, sg_nents(areq->dst),
	199	DMA_FROM_DEVICE);
	200	if (nr_sgd <= 0 \|\| nr_sgd > MAX_SG) {
	201	dev_err(ce->dev, "Invalid sg number %d\n", nr_sgd);
	202	err = -EINVAL;
	203	goto theend_sgs;
	204	}
	205	}
	206
	207	len = areq->cryptlen;
	208	for_each_sg(areq->src, sg, nr_sgs, i) {
93c7f4d3	209	cet->t_src[i].addr = cpu_to_le32(sg_dma_address(sg));
06f751b6	210	todo = min(len, sg_dma_len(sg));
93c7f4d3	211	cet->t_src[i].len = cpu_to_le32(todo / 4);
06f751b6 CL	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);
	214	len -= todo;
	215	}
	216	if (len > 0) {
	217	dev_err(ce->dev, "remaining len %d\n", len);
	218	err = -EINVAL;
	219	goto theend_sgs;
	220	}
	221
	222	len = areq->cryptlen;
	223	for_each_sg(areq->dst, sg, nr_sgd, i) {
93c7f4d3	224	cet->t_dst[i].addr = cpu_to_le32(sg_dma_address(sg));
06f751b6	225	todo = min(len, sg_dma_len(sg));
93c7f4d3	226	cet->t_dst[i].len = cpu_to_le32(todo / 4);
06f751b6 CL	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);
	229	len -= todo;
	230	}
	231	if (len > 0) {
	232	dev_err(ce->dev, "remaining len %d\n", len);
	233	err = -EINVAL;
	234	goto theend_sgs;
	235	}
	236
	237	chan->timeout = areq->cryptlen;
	238	err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(areq->base.tfm));
	239
	240	theend_sgs:
	241	if (areq->src == areq->dst) {
	242	dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL);
	243	} else {
	244	if (nr_sgs > 0)
	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);
	247	}
	248
	249	theend_iv:
	250	if (areq->iv && ivsize > 0) {
93c7f4d3 CL	251	if (addr_iv)
93c7f4d3 CL	252	dma_unmap_single(ce->dev, addr_iv, chan->ivlen,
06f751b6 CL	253	DMA_TO_DEVICE);
	254	offset = areq->cryptlen - ivsize;
	255	if (rctx->op_dir & CE_DECRYPTION) {
	256	memcpy(areq->iv, backup_iv, ivsize);
453431a5	257	kfree_sensitive(backup_iv);
06f751b6 CL	258	} else {
	259	scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
	260	ivsize, 0);
	261	}
	262	kfree(chan->bounce_iv);
	263	}
	264
	265	theend_key:
93c7f4d3	266	dma_unmap_single(ce->dev, addr_key, op->keylen, DMA_TO_DEVICE);
06f751b6 CL	267
	268	theend:
	269	return err;
	270	}
	271
	272	static int sun8i_ce_handle_cipher_request(struct crypto_engine engine, void areq)
	273	{
	274	int err;
	275	struct skcipher_request *breq = container_of(areq, struct skcipher_request, base);
	276
	277	err = sun8i_ce_cipher(breq);
	278	crypto_finalize_skcipher_request(engine, breq, err);
	279
	280	return 0;
	281	}
	282
	283	int sun8i_ce_skdecrypt(struct skcipher_request *areq)
	284	{
	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;
	289	int e;
	290
	291	rctx->op_dir = CE_DECRYPTION;
	292	if (sun8i_ce_cipher_need_fallback(areq))
	293	return sun8i_ce_cipher_fallback(areq);
	294
	295	e = sun8i_ce_get_engine_number(op->ce);
	296	rctx->flow = e;
	297	engine = op->ce->chanlist[e].engine;
	298
	299	return crypto_transfer_skcipher_request_to_engine(engine, areq);
	300	}
	301
	302	int sun8i_ce_skencrypt(struct skcipher_request *areq)
	303	{
	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;
	308	int e;
	309
	310	rctx->op_dir = CE_ENCRYPTION;
	311	if (sun8i_ce_cipher_need_fallback(areq))
	312	return sun8i_ce_cipher_fallback(areq);
	313
	314	e = sun8i_ce_get_engine_number(op->ce);
	315	rctx->flow = e;
	316	engine = op->ce->chanlist[e].engine;
	317
	318	return crypto_transfer_skcipher_request_to_engine(engine, areq);
	319	}
	320
	321	int sun8i_ce_cipher_init(struct crypto_tfm *tfm)
	322	{
	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);
	328	int err;
	329
	330	memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx));
331
332	algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
333	op->ce = algt->ce;
334
31abd3eb	335	op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
06f751b6 CL	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);
	340	}
	341
31abd3eb AB	342	sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx) +
	343	crypto_skcipher_reqsize(op->fallback_tfm);
	344
	345
06f751b6 CL	346	dev_info(op->ce->dev, "Fallback for %s is %s\n",
06f751b6 CL	347	crypto_tfm_alg_driver_name(&sktfm->base),
31abd3eb	348	crypto_tfm_alg_driver_name(crypto_skcipher_tfm(op->fallback_tfm)));
06f751b6 CL	349
	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;
	353
	354	err = pm_runtime_get_sync(op->ce->dev);
	355	if (err < 0)
	356	goto error_pm;
	357
	358	return 0;
	359	error_pm:
5c3a8a66	360	pm_runtime_put_noidle(op->ce->dev);
31abd3eb	361	crypto_free_skcipher(op->fallback_tfm);
06f751b6 CL	362	return err;
	363	}
	364
	365	void sun8i_ce_cipher_exit(struct crypto_tfm *tfm)
	366	{
	367	struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
	368
	369	if (op->key) {
	370	memzero_explicit(op->key, op->keylen);
	371	kfree(op->key);
	372	}
31abd3eb	373	crypto_free_skcipher(op->fallback_tfm);
06f751b6 CL	374	pm_runtime_put_sync_suspend(op->ce->dev);
	375	}
	376
	377	int sun8i_ce_aes_setkey(struct crypto_skcipher tfm, const u8 key,
	378	unsigned int keylen)
	379	{
	380	struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
	381	struct sun8i_ce_dev *ce = op->ce;
	382
	383	switch (keylen) {
	384	case 128 / 8:
	385	break;
	386	case 192 / 8:
	387	break;
	388	case 256 / 8:
	389	break;
	390	default:
	391	dev_dbg(ce->dev, "ERROR: Invalid keylen %u\n", keylen);
06f751b6 CL	392	return -EINVAL;
	393	}
	394	if (op->key) {
	395	memzero_explicit(op->key, op->keylen);
	396	kfree(op->key);
	397	}
	398	op->keylen = keylen;
c7351845	399	op->key = kmemdup(key, keylen, GFP_KERNEL \| GFP_DMA);
06f751b6 CL	400	if (!op->key)
06f751b6 CL	401	return -ENOMEM;
06f751b6	402
31abd3eb AB	403	crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
31abd3eb AB	404	crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
06f751b6	405
31abd3eb	406	return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
06f751b6 CL	407	}
	408
	409	int sun8i_ce_des3_setkey(struct crypto_skcipher tfm, const u8 key,
	410	unsigned int keylen)
	411	{
	412	struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
	413	int err;
	414
	415	err = verify_skcipher_des3_key(tfm, key);
	416	if (err)
	417	return err;
	418
	419	if (op->key) {
	420	memzero_explicit(op->key, op->keylen);
	421	kfree(op->key);
	422	}
	423	op->keylen = keylen;
c7351845	424	op->key = kmemdup(key, keylen, GFP_KERNEL \| GFP_DMA);
06f751b6 CL	425	if (!op->key)
06f751b6 CL	426	return -ENOMEM;
06f751b6	427
31abd3eb AB	428	crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
31abd3eb AB	429	crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
06f751b6	430
31abd3eb	431	return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
06f751b6	432	}