xref: /OK3568_Linux_fs/kernel/drivers/crypto/picoxcell_crypto.c (revision 4882a59341e53eb6f0b4789bf948001014eff981)

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2010-2011 Picochip Ltd., Jamie Iles
 */
#include <crypto/internal/aead.h>
#include <crypto/aes.h>
#include <crypto/algapi.h>
#include <crypto/authenc.h>
#include <crypto/internal/des.h>
#include <crypto/md5.h>
#include <crypto/sha.h>
#include <crypto/internal/skcipher.h>
#include <linux/clk.h>
#include <linux/crypto.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/rtnetlink.h>
#include <linux/scatterlist.h>
#include <linux/sched.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/timer.h>

#include "picoxcell_crypto_regs.h"

/*
 * The threshold for the number of entries in the CMD FIFO available before
 * the CMD0_CNT interrupt is raised. Increasing this value will reduce the
 * number of interrupts raised to the CPU.
 */
#define CMD0_IRQ_THRESHOLD   1

/*
 * The timeout period (in jiffies) for a PDU. When the the number of PDUs in
 * flight is greater than the STAT_IRQ_THRESHOLD or 0 the timer is disabled.
 * When there are packets in flight but lower than the threshold, we enable
 * the timer and at expiry, attempt to remove any processed packets from the
 * queue and if there are still packets left, schedule the timer again.
 */
#define PACKET_TIMEOUT	    1

/* The priority to register each algorithm with. */
#define SPACC_CRYPTO_ALG_PRIORITY	10000

#define SPACC_CRYPTO_KASUMI_F8_KEY_LEN	16
#define SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ 64
#define SPACC_CRYPTO_IPSEC_HASH_PG_SZ	64
#define SPACC_CRYPTO_IPSEC_MAX_CTXS	32
#define SPACC_CRYPTO_IPSEC_FIFO_SZ	32
#define SPACC_CRYPTO_L2_CIPHER_PG_SZ	64
#define SPACC_CRYPTO_L2_HASH_PG_SZ	64
#define SPACC_CRYPTO_L2_MAX_CTXS	128
#define SPACC_CRYPTO_L2_FIFO_SZ		128

#define MAX_DDT_LEN			16

/* DDT format. This must match the hardware DDT format exactly. */
struct spacc_ddt {
	dma_addr_t	p;
	u32		len;
};

/*
 * Asynchronous crypto request structure.
 *
 * This structure defines a request that is either queued for processing or
 * being processed.
 */
struct spacc_req {
	struct list_head		list;
	struct spacc_engine		*engine;
	struct crypto_async_request	*req;
	int				result;
	bool				is_encrypt;
	unsigned			ctx_id;
	dma_addr_t			src_addr, dst_addr;
	struct spacc_ddt		*src_ddt, *dst_ddt;
	void				(*complete)(struct spacc_req *req);
	struct skcipher_request		fallback_req;	// keep at the end
};

struct spacc_aead {
	unsigned long			ctrl_default;
	unsigned long			type;
	struct aead_alg			alg;
	struct spacc_engine		*engine;
	struct list_head		entry;
	int				key_offs;
	int				iv_offs;
};

struct spacc_engine {
	void __iomem			*regs;
	struct list_head		pending;
	int				next_ctx;
	spinlock_t			hw_lock;
	int				in_flight;
	struct list_head		completed;
	struct list_head		in_progress;
	struct tasklet_struct		complete;
	unsigned long			fifo_sz;
	void __iomem			*cipher_ctx_base;
	void __iomem			*hash_key_base;
	struct spacc_alg		*algs;
	unsigned			num_algs;
	struct list_head		registered_algs;
	struct spacc_aead		*aeads;
	unsigned			num_aeads;
	struct list_head		registered_aeads;
	size_t				cipher_pg_sz;
	size_t				hash_pg_sz;
	const char			*name;
	struct clk			*clk;
	struct device			*dev;
	unsigned			max_ctxs;
	struct timer_list		packet_timeout;
	unsigned			stat_irq_thresh;
	struct dma_pool			*req_pool;
};

/* Algorithm type mask. */
#define SPACC_CRYPTO_ALG_MASK		0x7

/* SPACC definition of a crypto algorithm. */
struct spacc_alg {
	unsigned long			ctrl_default;
	unsigned long			type;
	struct skcipher_alg		alg;
	struct spacc_engine		*engine;
	struct list_head		entry;
	int				key_offs;
	int				iv_offs;
};

/* Generic context structure for any algorithm type. */
struct spacc_generic_ctx {
	struct spacc_engine		*engine;
	int				flags;
	int				key_offs;
	int				iv_offs;
};

/* Block cipher context. */
struct spacc_ablk_ctx {
	struct spacc_generic_ctx	generic;
	u8				key[AES_MAX_KEY_SIZE];
	u8				key_len;
	/*
	 * The fallback cipher. If the operation can't be done in hardware,
	 * fallback to a software version.
	 */
	struct crypto_skcipher		*sw_cipher;
};

/* AEAD cipher context. */
struct spacc_aead_ctx {
	struct spacc_generic_ctx	generic;
	u8				cipher_key[AES_MAX_KEY_SIZE];
	u8				hash_ctx[SPACC_CRYPTO_IPSEC_HASH_PG_SZ];
	u8				cipher_key_len;
	u8				hash_key_len;
	struct crypto_aead		*sw_cipher;
};

static int spacc_ablk_submit(struct spacc_req *req);

static inline struct spacc_alg *to_spacc_skcipher(struct skcipher_alg *alg)
{
	return alg ? container_of(alg, struct spacc_alg, alg) : NULL;
}

static inline struct spacc_aead *to_spacc_aead(struct aead_alg *alg)
{
	return container_of(alg, struct spacc_aead, alg);
}

static inline int spacc_fifo_cmd_full(struct spacc_engine *engine)
{
	u32 fifo_stat = readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET);

	return fifo_stat & SPA_FIFO_CMD_FULL;
}

/*
 * Given a cipher context, and a context number, get the base address of the
 * context page.
 *
 * Returns the address of the context page where the key/context may
 * be written.
 */
static inline void __iomem *spacc_ctx_page_addr(struct spacc_generic_ctx *ctx,
						unsigned indx,
						bool is_cipher_ctx)
{
	return is_cipher_ctx ? ctx->engine->cipher_ctx_base +
			(indx * ctx->engine->cipher_pg_sz) :
		ctx->engine->hash_key_base + (indx * ctx->engine->hash_pg_sz);
}

/* The context pages can only be written with 32-bit accesses. */
static inline void memcpy_toio32(u32 __iomem *dst, const void *src,
				 unsigned count)
{
	const u32 *src32 = (const u32 *) src;

	while (count--)
		writel(*src32++, dst++);
}

static void spacc_cipher_write_ctx(struct spacc_generic_ctx *ctx,
				   void __iomem *page_addr, const u8 *key,
				   size_t key_len, const u8 *iv, size_t iv_len)
{
	void __iomem *key_ptr = page_addr + ctx->key_offs;
	void __iomem *iv_ptr = page_addr + ctx->iv_offs;

	memcpy_toio32(key_ptr, key, key_len / 4);
	memcpy_toio32(iv_ptr, iv, iv_len / 4);
}

/*
 * Load a context into the engines context memory.
 *
 * Returns the index of the context page where the context was loaded.
 */
static unsigned spacc_load_ctx(struct spacc_generic_ctx *ctx,
			       const u8 *ciph_key, size_t ciph_len,
			       const u8 *iv, size_t ivlen, const u8 *hash_key,
			       size_t hash_len)
{
	unsigned indx = ctx->engine->next_ctx++;
	void __iomem *ciph_page_addr, *hash_page_addr;

	ciph_page_addr = spacc_ctx_page_addr(ctx, indx, 1);
	hash_page_addr = spacc_ctx_page_addr(ctx, indx, 0);

	ctx->engine->next_ctx &= ctx->engine->fifo_sz - 1;
	spacc_cipher_write_ctx(ctx, ciph_page_addr, ciph_key, ciph_len, iv,
			       ivlen);
	writel(ciph_len | (indx << SPA_KEY_SZ_CTX_INDEX_OFFSET) |
	       (1 << SPA_KEY_SZ_CIPHER_OFFSET),
	       ctx->engine->regs + SPA_KEY_SZ_REG_OFFSET);

	if (hash_key) {
		memcpy_toio32(hash_page_addr, hash_key, hash_len / 4);
		writel(hash_len | (indx << SPA_KEY_SZ_CTX_INDEX_OFFSET),
		       ctx->engine->regs + SPA_KEY_SZ_REG_OFFSET);
	}

	return indx;
}

static inline void ddt_set(struct spacc_ddt *ddt, dma_addr_t phys, size_t len)
{
	ddt->p = phys;
	ddt->len = len;
}

/*
 * Take a crypto request and scatterlists for the data and turn them into DDTs
 * for passing to the crypto engines. This also DMA maps the data so that the
 * crypto engines can DMA to/from them.
 */
static struct spacc_ddt *spacc_sg_to_ddt(struct spacc_engine *engine,
					 struct scatterlist *payload,
					 unsigned nbytes,
					 enum dma_data_direction dir,
					 dma_addr_t *ddt_phys)
{
	unsigned mapped_ents;
	struct scatterlist *cur;
	struct spacc_ddt *ddt;
	int i;
	int nents;

	nents = sg_nents_for_len(payload, nbytes);
	if (nents < 0) {
		dev_err(engine->dev, "Invalid numbers of SG.\n");
		return NULL;
	}
	mapped_ents = dma_map_sg(engine->dev, payload, nents, dir);

	if (mapped_ents + 1 > MAX_DDT_LEN)
		goto out;

	ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, ddt_phys);
	if (!ddt)
		goto out;

	for_each_sg(payload, cur, mapped_ents, i)
		ddt_set(&ddt[i], sg_dma_address(cur), sg_dma_len(cur));
	ddt_set(&ddt[mapped_ents], 0, 0);

	return ddt;

out:
	dma_unmap_sg(engine->dev, payload, nents, dir);
	return NULL;
}

static int spacc_aead_make_ddts(struct aead_request *areq)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(areq);
	struct spacc_req *req = aead_request_ctx(areq);
	struct spacc_engine *engine = req->engine;
	struct spacc_ddt *src_ddt, *dst_ddt;
	unsigned total;
	int src_nents, dst_nents;
	struct scatterlist *cur;
	int i, dst_ents, src_ents;

	total = areq->assoclen + areq->cryptlen;
	if (req->is_encrypt)
		total += crypto_aead_authsize(aead);

	src_nents = sg_nents_for_len(areq->src, total);
	if (src_nents < 0) {
		dev_err(engine->dev, "Invalid numbers of src SG.\n");
		return src_nents;
	}
	if (src_nents + 1 > MAX_DDT_LEN)
		return -E2BIG;

	dst_nents = 0;
	if (areq->src != areq->dst) {
		dst_nents = sg_nents_for_len(areq->dst, total);
		if (dst_nents < 0) {
			dev_err(engine->dev, "Invalid numbers of dst SG.\n");
			return dst_nents;
		}
		if (src_nents + 1 > MAX_DDT_LEN)
			return -E2BIG;
	}

	src_ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, &req->src_addr);
	if (!src_ddt)
		goto err;

	dst_ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, &req->dst_addr);
	if (!dst_ddt)
		goto err_free_src;

	req->src_ddt = src_ddt;
	req->dst_ddt = dst_ddt;

	if (dst_nents) {
		src_ents = dma_map_sg(engine->dev, areq->src, src_nents,
				      DMA_TO_DEVICE);
		if (!src_ents)
			goto err_free_dst;

		dst_ents = dma_map_sg(engine->dev, areq->dst, dst_nents,
				      DMA_FROM_DEVICE);

		if (!dst_ents) {
			dma_unmap_sg(engine->dev, areq->src, src_nents,
				     DMA_TO_DEVICE);
			goto err_free_dst;
		}
	} else {
		src_ents = dma_map_sg(engine->dev, areq->src, src_nents,
				      DMA_BIDIRECTIONAL);
		if (!src_ents)
			goto err_free_dst;
		dst_ents = src_ents;
	}

	/*
	 * Now map in the payload for the source and destination and terminate
	 * with the NULL pointers.
	 */
	for_each_sg(areq->src, cur, src_ents, i)
		ddt_set(src_ddt++, sg_dma_address(cur), sg_dma_len(cur));

	/* For decryption we need to skip the associated data. */
	total = req->is_encrypt ? 0 : areq->assoclen;
	for_each_sg(areq->dst, cur, dst_ents, i) {
		unsigned len = sg_dma_len(cur);

		if (len <= total) {
			total -= len;
			continue;
		}

		ddt_set(dst_ddt++, sg_dma_address(cur) + total, len - total);
	}

	ddt_set(src_ddt, 0, 0);
	ddt_set(dst_ddt, 0, 0);

	return 0;

err_free_dst:
	dma_pool_free(engine->req_pool, dst_ddt, req->dst_addr);
err_free_src:
	dma_pool_free(engine->req_pool, src_ddt, req->src_addr);
err:
	return -ENOMEM;
}

static void spacc_aead_free_ddts(struct spacc_req *req)
{
	struct aead_request *areq = container_of(req->req, struct aead_request,
						 base);
	struct crypto_aead *aead = crypto_aead_reqtfm(areq);
	unsigned total = areq->assoclen + areq->cryptlen +
			 (req->is_encrypt ? crypto_aead_authsize(aead) : 0);
	struct spacc_aead_ctx *aead_ctx = crypto_aead_ctx(aead);
	struct spacc_engine *engine = aead_ctx->generic.engine;
	int nents = sg_nents_for_len(areq->src, total);

	/* sg_nents_for_len should not fail since it works when mapping sg */
	if (unlikely(nents < 0)) {
		dev_err(engine->dev, "Invalid numbers of src SG.\n");
		return;
	}

	if (areq->src != areq->dst) {
		dma_unmap_sg(engine->dev, areq->src, nents, DMA_TO_DEVICE);
		nents = sg_nents_for_len(areq->dst, total);
		if (unlikely(nents < 0)) {
			dev_err(engine->dev, "Invalid numbers of dst SG.\n");
			return;
		}
		dma_unmap_sg(engine->dev, areq->dst, nents, DMA_FROM_DEVICE);
	} else
		dma_unmap_sg(engine->dev, areq->src, nents, DMA_BIDIRECTIONAL);

	dma_pool_free(engine->req_pool, req->src_ddt, req->src_addr);
	dma_pool_free(engine->req_pool, req->dst_ddt, req->dst_addr);
}

static void spacc_free_ddt(struct spacc_req *req, struct spacc_ddt *ddt,
			   dma_addr_t ddt_addr, struct scatterlist *payload,
			   unsigned nbytes, enum dma_data_direction dir)
{
	int nents = sg_nents_for_len(payload, nbytes);

	if (nents < 0) {
		dev_err(req->engine->dev, "Invalid numbers of SG.\n");
		return;
	}

	dma_unmap_sg(req->engine->dev, payload, nents, dir);
	dma_pool_free(req->engine->req_pool, ddt, ddt_addr);
}

static int spacc_aead_setkey(struct crypto_aead *tfm, const u8 *key,
			     unsigned int keylen)
{
	struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
	struct crypto_authenc_keys keys;
	int err;

	crypto_aead_clear_flags(ctx->sw_cipher, CRYPTO_TFM_REQ_MASK);
	crypto_aead_set_flags(ctx->sw_cipher, crypto_aead_get_flags(tfm) &
					      CRYPTO_TFM_REQ_MASK);
	err = crypto_aead_setkey(ctx->sw_cipher, key, keylen);
	if (err)
		return err;

	if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
		goto badkey;

	if (keys.enckeylen > AES_MAX_KEY_SIZE)
		goto badkey;

	if (keys.authkeylen > sizeof(ctx->hash_ctx))
		goto badkey;

	memcpy(ctx->cipher_key, keys.enckey, keys.enckeylen);
	ctx->cipher_key_len = keys.enckeylen;

	memcpy(ctx->hash_ctx, keys.authkey, keys.authkeylen);
	ctx->hash_key_len = keys.authkeylen;

	memzero_explicit(&keys, sizeof(keys));
	return 0;

badkey:
	memzero_explicit(&keys, sizeof(keys));
	return -EINVAL;
}

static int spacc_aead_setauthsize(struct crypto_aead *tfm,
				  unsigned int authsize)
{
	struct spacc_aead_ctx *ctx = crypto_tfm_ctx(crypto_aead_tfm(tfm));

	return crypto_aead_setauthsize(ctx->sw_cipher, authsize);
}

/*
 * Check if an AEAD request requires a fallback operation. Some requests can't
 * be completed in hardware because the hardware may not support certain key
 * sizes. In these cases we need to complete the request in software.
 */
static int spacc_aead_need_fallback(struct aead_request *aead_req)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
	struct aead_alg *alg = crypto_aead_alg(aead);
	struct spacc_aead *spacc_alg = to_spacc_aead(alg);
	struct spacc_aead_ctx *ctx = crypto_aead_ctx(aead);

	/*
	 * If we have a non-supported key-length, then we need to do a
	 * software fallback.
	 */
	if ((spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
	    SPA_CTRL_CIPH_ALG_AES &&
	    ctx->cipher_key_len != AES_KEYSIZE_128 &&
	    ctx->cipher_key_len != AES_KEYSIZE_256)
		return 1;

	return 0;
}

static int spacc_aead_do_fallback(struct aead_request *req, unsigned alg_type,
				  bool is_encrypt)
{
	struct crypto_tfm *old_tfm = crypto_aead_tfm(crypto_aead_reqtfm(req));
	struct spacc_aead_ctx *ctx = crypto_tfm_ctx(old_tfm);
	struct aead_request *subreq = aead_request_ctx(req);

	aead_request_set_tfm(subreq, ctx->sw_cipher);
	aead_request_set_callback(subreq, req->base.flags,
				  req->base.complete, req->base.data);
	aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
			       req->iv);
	aead_request_set_ad(subreq, req->assoclen);

	return is_encrypt ? crypto_aead_encrypt(subreq) :
			    crypto_aead_decrypt(subreq);
}

static void spacc_aead_complete(struct spacc_req *req)
{
	spacc_aead_free_ddts(req);
	req->req->complete(req->req, req->result);
}

static int spacc_aead_submit(struct spacc_req *req)
{
	struct aead_request *aead_req =
		container_of(req->req, struct aead_request, base);
	struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
	unsigned int authsize = crypto_aead_authsize(aead);
	struct spacc_aead_ctx *ctx = crypto_aead_ctx(aead);
	struct aead_alg *alg = crypto_aead_alg(aead);
	struct spacc_aead *spacc_alg = to_spacc_aead(alg);
	struct spacc_engine *engine = ctx->generic.engine;
	u32 ctrl, proc_len, assoc_len;

	req->result = -EINPROGRESS;
	req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->cipher_key,
		ctx->cipher_key_len, aead_req->iv, crypto_aead_ivsize(aead),
		ctx->hash_ctx, ctx->hash_key_len);

	/* Set the source and destination DDT pointers. */
	writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
	writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
	writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);

	assoc_len = aead_req->assoclen;
	proc_len = aead_req->cryptlen + assoc_len;

	/*
	 * If we are decrypting, we need to take the length of the ICV out of
	 * the processing length.
	 */
	if (!req->is_encrypt)
		proc_len -= authsize;

	writel(proc_len, engine->regs + SPA_PROC_LEN_REG_OFFSET);
	writel(assoc_len, engine->regs + SPA_AAD_LEN_REG_OFFSET);
	writel(authsize, engine->regs + SPA_ICV_LEN_REG_OFFSET);
	writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
	writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);

	ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
		(1 << SPA_CTRL_ICV_APPEND);
	if (req->is_encrypt)
		ctrl |= (1 << SPA_CTRL_ENCRYPT_IDX) | (1 << SPA_CTRL_AAD_COPY);
	else
		ctrl |= (1 << SPA_CTRL_KEY_EXP);

	mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);

	writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);

	return -EINPROGRESS;
}

static int spacc_req_submit(struct spacc_req *req);

static void spacc_push(struct spacc_engine *engine)
{
	struct spacc_req *req;

	while (!list_empty(&engine->pending) &&
	       engine->in_flight + 1 <= engine->fifo_sz) {

		++engine->in_flight;
		req = list_first_entry(&engine->pending, struct spacc_req,
				       list);
		list_move_tail(&req->list, &engine->in_progress);

		req->result = spacc_req_submit(req);
	}
}

/*
 * Setup an AEAD request for processing. This will configure the engine, load
 * the context and then start the packet processing.
 */
static int spacc_aead_setup(struct aead_request *req,
			    unsigned alg_type, bool is_encrypt)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct aead_alg *alg = crypto_aead_alg(aead);
	struct spacc_engine *engine = to_spacc_aead(alg)->engine;
	struct spacc_req *dev_req = aead_request_ctx(req);
	int err;
	unsigned long flags;

	dev_req->req		= &req->base;
	dev_req->is_encrypt	= is_encrypt;
	dev_req->result		= -EBUSY;
	dev_req->engine		= engine;
	dev_req->complete	= spacc_aead_complete;

	if (unlikely(spacc_aead_need_fallback(req) ||
		     ((err = spacc_aead_make_ddts(req)) == -E2BIG)))
		return spacc_aead_do_fallback(req, alg_type, is_encrypt);

	if (err)
		goto out;

	err = -EINPROGRESS;
	spin_lock_irqsave(&engine->hw_lock, flags);
	if (unlikely(spacc_fifo_cmd_full(engine)) ||
	    engine->in_flight + 1 > engine->fifo_sz) {
		if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
			err = -EBUSY;
			spin_unlock_irqrestore(&engine->hw_lock, flags);
			goto out_free_ddts;
		}
		list_add_tail(&dev_req->list, &engine->pending);
	} else {
		list_add_tail(&dev_req->list, &engine->pending);
		spacc_push(engine);
	}
	spin_unlock_irqrestore(&engine->hw_lock, flags);

	goto out;

out_free_ddts:
	spacc_aead_free_ddts(dev_req);
out:
	return err;
}

static int spacc_aead_encrypt(struct aead_request *req)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct spacc_aead *alg = to_spacc_aead(crypto_aead_alg(aead));

	return spacc_aead_setup(req, alg->type, 1);
}

static int spacc_aead_decrypt(struct aead_request *req)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct spacc_aead  *alg = to_spacc_aead(crypto_aead_alg(aead));

	return spacc_aead_setup(req, alg->type, 0);
}

/*
 * Initialise a new AEAD context. This is responsible for allocating the
 * fallback cipher and initialising the context.
 */
static int spacc_aead_cra_init(struct crypto_aead *tfm)
{
	struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
	struct aead_alg *alg = crypto_aead_alg(tfm);
	struct spacc_aead *spacc_alg = to_spacc_aead(alg);
	struct spacc_engine *engine = spacc_alg->engine;

	ctx->generic.flags = spacc_alg->type;
	ctx->generic.engine = engine;
	ctx->sw_cipher = crypto_alloc_aead(alg->base.cra_name, 0,
					   CRYPTO_ALG_NEED_FALLBACK);
	if (IS_ERR(ctx->sw_cipher))
		return PTR_ERR(ctx->sw_cipher);
	ctx->generic.key_offs = spacc_alg->key_offs;
	ctx->generic.iv_offs = spacc_alg->iv_offs;

	crypto_aead_set_reqsize(
		tfm,
		max(sizeof(struct spacc_req),
		    sizeof(struct aead_request) +
		    crypto_aead_reqsize(ctx->sw_cipher)));

	return 0;
}

/*
 * Destructor for an AEAD context. This is called when the transform is freed
 * and must free the fallback cipher.
 */
static void spacc_aead_cra_exit(struct crypto_aead *tfm)
{
	struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);

	crypto_free_aead(ctx->sw_cipher);
}

/*
 * Set the DES key for a block cipher transform. This also performs weak key
 * checking if the transform has requested it.
 */
static int spacc_des_setkey(struct crypto_skcipher *cipher, const u8 *key,
			    unsigned int len)
{
	struct spacc_ablk_ctx *ctx = crypto_skcipher_ctx(cipher);
	int err;

	err = verify_skcipher_des_key(cipher, key);
	if (err)
		return err;

	memcpy(ctx->key, key, len);
	ctx->key_len = len;

	return 0;
}

/*
 * Set the 3DES key for a block cipher transform. This also performs weak key
 * checking if the transform has requested it.
 */
static int spacc_des3_setkey(struct crypto_skcipher *cipher, const u8 *key,
			     unsigned int len)
{
	struct spacc_ablk_ctx *ctx = crypto_skcipher_ctx(cipher);
	int err;

	err = verify_skcipher_des3_key(cipher, key);
	if (err)
		return err;

	memcpy(ctx->key, key, len);
	ctx->key_len = len;

	return 0;
}

/*
 * Set the key for an AES block cipher. Some key lengths are not supported in
 * hardware so this must also check whether a fallback is needed.
 */
static int spacc_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
			    unsigned int len)
{
	struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
	struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
	int err = 0;

	if (len > AES_MAX_KEY_SIZE)
		return -EINVAL;

	/*
	 * IPSec engine only supports 128 and 256 bit AES keys. If we get a
	 * request for any other size (192 bits) then we need to do a software
	 * fallback.
	 */
	if (len != AES_KEYSIZE_128 && len != AES_KEYSIZE_256) {
		if (!ctx->sw_cipher)
			return -EINVAL;

		/*
		 * Set the fallback transform to use the same request flags as
		 * the hardware transform.
		 */
		crypto_skcipher_clear_flags(ctx->sw_cipher,
					    CRYPTO_TFM_REQ_MASK);
		crypto_skcipher_set_flags(ctx->sw_cipher,
					  cipher->base.crt_flags &
					  CRYPTO_TFM_REQ_MASK);

		err = crypto_skcipher_setkey(ctx->sw_cipher, key, len);
		if (err)
			goto sw_setkey_failed;
	}

	memcpy(ctx->key, key, len);
	ctx->key_len = len;

sw_setkey_failed:
	return err;
}

static int spacc_kasumi_f8_setkey(struct crypto_skcipher *cipher,
				  const u8 *key, unsigned int len)
{
	struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
	struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
	int err = 0;

	if (len > AES_MAX_KEY_SIZE) {
		err = -EINVAL;
		goto out;
	}

	memcpy(ctx->key, key, len);
	ctx->key_len = len;

out:
	return err;
}

static int spacc_ablk_need_fallback(struct spacc_req *req)
{
	struct skcipher_request *ablk_req = skcipher_request_cast(req->req);
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(ablk_req);
	struct spacc_alg *spacc_alg = to_spacc_skcipher(crypto_skcipher_alg(tfm));
	struct spacc_ablk_ctx *ctx;

	ctx = crypto_skcipher_ctx(tfm);

	return (spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
			SPA_CTRL_CIPH_ALG_AES &&
			ctx->key_len != AES_KEYSIZE_128 &&
			ctx->key_len != AES_KEYSIZE_256;
}

static void spacc_ablk_complete(struct spacc_req *req)
{
	struct skcipher_request *ablk_req = skcipher_request_cast(req->req);

	if (ablk_req->src != ablk_req->dst) {
		spacc_free_ddt(req, req->src_ddt, req->src_addr, ablk_req->src,
			       ablk_req->cryptlen, DMA_TO_DEVICE);
		spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
			       ablk_req->cryptlen, DMA_FROM_DEVICE);
	} else
		spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
			       ablk_req->cryptlen, DMA_BIDIRECTIONAL);

	req->req->complete(req->req, req->result);
}

static int spacc_ablk_submit(struct spacc_req *req)
{
	struct skcipher_request *ablk_req = skcipher_request_cast(req->req);
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(ablk_req);
	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
	struct spacc_alg *spacc_alg = to_spacc_skcipher(alg);
	struct spacc_ablk_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct spacc_engine *engine = ctx->generic.engine;
	u32 ctrl;

	req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->key,
		ctx->key_len, ablk_req->iv, alg->ivsize,
		NULL, 0);

	writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
	writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
	writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);

	writel(ablk_req->cryptlen, engine->regs + SPA_PROC_LEN_REG_OFFSET);
	writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
	writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
	writel(0, engine->regs + SPA_AAD_LEN_REG_OFFSET);

	ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
		(req->is_encrypt ? (1 << SPA_CTRL_ENCRYPT_IDX) :
		 (1 << SPA_CTRL_KEY_EXP));

	mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);

	writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);

	return -EINPROGRESS;
}

static int spacc_ablk_do_fallback(struct skcipher_request *req,
				  unsigned alg_type, bool is_encrypt)
{
	struct crypto_tfm *old_tfm =
	    crypto_skcipher_tfm(crypto_skcipher_reqtfm(req));
	struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(old_tfm);
	struct spacc_req *dev_req = skcipher_request_ctx(req);
	int err;

	/*
	 * Change the request to use the software fallback transform, and once
	 * the ciphering has completed, put the old transform back into the
	 * request.
	 */
	skcipher_request_set_tfm(&dev_req->fallback_req, ctx->sw_cipher);
	skcipher_request_set_callback(&dev_req->fallback_req, req->base.flags,
				      req->base.complete, req->base.data);
	skcipher_request_set_crypt(&dev_req->fallback_req, req->src, req->dst,
				   req->cryptlen, req->iv);
	err = is_encrypt ? crypto_skcipher_encrypt(&dev_req->fallback_req) :
			   crypto_skcipher_decrypt(&dev_req->fallback_req);

	return err;
}

static int spacc_ablk_setup(struct skcipher_request *req, unsigned alg_type,
			    bool is_encrypt)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
	struct spacc_engine *engine = to_spacc_skcipher(alg)->engine;
	struct spacc_req *dev_req = skcipher_request_ctx(req);
	unsigned long flags;
	int err = -ENOMEM;

	dev_req->req		= &req->base;
	dev_req->is_encrypt	= is_encrypt;
	dev_req->engine		= engine;
	dev_req->complete	= spacc_ablk_complete;
	dev_req->result		= -EINPROGRESS;

	if (unlikely(spacc_ablk_need_fallback(dev_req)))
		return spacc_ablk_do_fallback(req, alg_type, is_encrypt);

	/*
	 * Create the DDT's for the engine. If we share the same source and
	 * destination then we can optimize by reusing the DDT's.
	 */
	if (req->src != req->dst) {
		dev_req->src_ddt = spacc_sg_to_ddt(engine, req->src,
			req->cryptlen, DMA_TO_DEVICE, &dev_req->src_addr);
		if (!dev_req->src_ddt)
			goto out;

		dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
			req->cryptlen, DMA_FROM_DEVICE, &dev_req->dst_addr);
		if (!dev_req->dst_ddt)
			goto out_free_src;
	} else {
		dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
			req->cryptlen, DMA_BIDIRECTIONAL, &dev_req->dst_addr);
		if (!dev_req->dst_ddt)
			goto out;

		dev_req->src_ddt = NULL;
		dev_req->src_addr = dev_req->dst_addr;
	}

	err = -EINPROGRESS;
	spin_lock_irqsave(&engine->hw_lock, flags);
	/*
	 * Check if the engine will accept the operation now. If it won't then
	 * we either stick it on the end of a pending list if we can backlog,
	 * or bailout with an error if not.
	 */
	if (unlikely(spacc_fifo_cmd_full(engine)) ||
	    engine->in_flight + 1 > engine->fifo_sz) {
		if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
			err = -EBUSY;
			spin_unlock_irqrestore(&engine->hw_lock, flags);
			goto out_free_ddts;
		}
		list_add_tail(&dev_req->list, &engine->pending);
	} else {
		list_add_tail(&dev_req->list, &engine->pending);
		spacc_push(engine);
	}
	spin_unlock_irqrestore(&engine->hw_lock, flags);

	goto out;

out_free_ddts:
	spacc_free_ddt(dev_req, dev_req->dst_ddt, dev_req->dst_addr, req->dst,
		       req->cryptlen, req->src == req->dst ?
		       DMA_BIDIRECTIONAL : DMA_FROM_DEVICE);
out_free_src:
	if (req->src != req->dst)
		spacc_free_ddt(dev_req, dev_req->src_ddt, dev_req->src_addr,
			       req->src, req->cryptlen, DMA_TO_DEVICE);
out:
	return err;
}

static int spacc_ablk_init_tfm(struct crypto_skcipher *tfm)
{
	struct spacc_ablk_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
	struct spacc_alg *spacc_alg = to_spacc_skcipher(alg);
	struct spacc_engine *engine = spacc_alg->engine;

	ctx->generic.flags = spacc_alg->type;
	ctx->generic.engine = engine;
	if (alg->base.cra_flags & CRYPTO_ALG_NEED_FALLBACK) {
		ctx->sw_cipher = crypto_alloc_skcipher(alg->base.cra_name, 0,
						       CRYPTO_ALG_NEED_FALLBACK);
		if (IS_ERR(ctx->sw_cipher)) {
			dev_warn(engine->dev, "failed to allocate fallback for %s\n",
				 alg->base.cra_name);
			return PTR_ERR(ctx->sw_cipher);
		}
		crypto_skcipher_set_reqsize(tfm, sizeof(struct spacc_req) +
						 crypto_skcipher_reqsize(ctx->sw_cipher));
	} else {
		/* take the size without the fallback skcipher_request at the end */
		crypto_skcipher_set_reqsize(tfm, offsetof(struct spacc_req,
							  fallback_req));
	}

	ctx->generic.key_offs = spacc_alg->key_offs;
	ctx->generic.iv_offs = spacc_alg->iv_offs;

	return 0;
}

static void spacc_ablk_exit_tfm(struct crypto_skcipher *tfm)
{
	struct spacc_ablk_ctx *ctx = crypto_skcipher_ctx(tfm);

	crypto_free_skcipher(ctx->sw_cipher);
}

static int spacc_ablk_encrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
	struct skcipher_alg *alg = crypto_skcipher_alg(cipher);
	struct spacc_alg *spacc_alg = to_spacc_skcipher(alg);

	return spacc_ablk_setup(req, spacc_alg->type, 1);
}

static int spacc_ablk_decrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
	struct skcipher_alg *alg = crypto_skcipher_alg(cipher);
	struct spacc_alg *spacc_alg = to_spacc_skcipher(alg);

	return spacc_ablk_setup(req, spacc_alg->type, 0);
}

static inline int spacc_fifo_stat_empty(struct spacc_engine *engine)
{
	return readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET) &
		SPA_FIFO_STAT_EMPTY;
}

static void spacc_process_done(struct spacc_engine *engine)
{
	struct spacc_req *req;
	unsigned long flags;

	spin_lock_irqsave(&engine->hw_lock, flags);

	while (!spacc_fifo_stat_empty(engine)) {
		req = list_first_entry(&engine->in_progress, struct spacc_req,
				       list);
		list_move_tail(&req->list, &engine->completed);
		--engine->in_flight;

		/* POP the status register. */
		writel(~0, engine->regs + SPA_STAT_POP_REG_OFFSET);
		req->result = (readl(engine->regs + SPA_STATUS_REG_OFFSET) &
		     SPA_STATUS_RES_CODE_MASK) >> SPA_STATUS_RES_CODE_OFFSET;

		/*
		 * Convert the SPAcc error status into the standard POSIX error
		 * codes.
		 */
		if (unlikely(req->result)) {
			switch (req->result) {
			case SPA_STATUS_ICV_FAIL:
				req->result = -EBADMSG;
				break;

			case SPA_STATUS_MEMORY_ERROR:
				dev_warn(engine->dev,
					 "memory error triggered\n");
				req->result = -EFAULT;
				break;

			case SPA_STATUS_BLOCK_ERROR:
				dev_warn(engine->dev,
					 "block error triggered\n");
				req->result = -EIO;
				break;
			}
		}
	}

	tasklet_schedule(&engine->complete);

	spin_unlock_irqrestore(&engine->hw_lock, flags);
}

static irqreturn_t spacc_spacc_irq(int irq, void *dev)
{
	struct spacc_engine *engine = (struct spacc_engine *)dev;
	u32 spacc_irq_stat = readl(engine->regs + SPA_IRQ_STAT_REG_OFFSET);

	writel(spacc_irq_stat, engine->regs + SPA_IRQ_STAT_REG_OFFSET);
	spacc_process_done(engine);

	return IRQ_HANDLED;
}

static void spacc_packet_timeout(struct timer_list *t)
{
	struct spacc_engine *engine = from_timer(engine, t, packet_timeout);

	spacc_process_done(engine);
}

static int spacc_req_submit(struct spacc_req *req)
{
	struct crypto_alg *alg = req->req->tfm->__crt_alg;

	if (CRYPTO_ALG_TYPE_AEAD == (CRYPTO_ALG_TYPE_MASK & alg->cra_flags))
		return spacc_aead_submit(req);
	else
		return spacc_ablk_submit(req);
}

static void spacc_spacc_complete(unsigned long data)
{
	struct spacc_engine *engine = (struct spacc_engine *)data;
	struct spacc_req *req, *tmp;
	unsigned long flags;
	LIST_HEAD(completed);

	spin_lock_irqsave(&engine->hw_lock, flags);

	list_splice_init(&engine->completed, &completed);
	spacc_push(engine);
	if (engine->in_flight)
		mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);

	spin_unlock_irqrestore(&engine->hw_lock, flags);

	list_for_each_entry_safe(req, tmp, &completed, list) {
		list_del(&req->list);
		req->complete(req);
	}
}

#ifdef CONFIG_PM
static int spacc_suspend(struct device *dev)
{
	struct spacc_engine *engine = dev_get_drvdata(dev);

	/*
	 * We only support standby mode. All we have to do is gate the clock to
	 * the spacc. The hardware will preserve state until we turn it back
	 * on again.
	 */
	clk_disable(engine->clk);

	return 0;
}

static int spacc_resume(struct device *dev)
{
	struct spacc_engine *engine = dev_get_drvdata(dev);

	return clk_enable(engine->clk);
}

static const struct dev_pm_ops spacc_pm_ops = {
	.suspend	= spacc_suspend,
	.resume		= spacc_resume,
};
#endif /* CONFIG_PM */

static inline struct spacc_engine *spacc_dev_to_engine(struct device *dev)
{
	return dev ? dev_get_drvdata(dev) : NULL;
}

static ssize_t spacc_stat_irq_thresh_show(struct device *dev,
					  struct device_attribute *attr,
					  char *buf)
{
	struct spacc_engine *engine = spacc_dev_to_engine(dev);

	return snprintf(buf, PAGE_SIZE, "%u\n", engine->stat_irq_thresh);
}

static ssize_t spacc_stat_irq_thresh_store(struct device *dev,
					   struct device_attribute *attr,
					   const char *buf, size_t len)
{
	struct spacc_engine *engine = spacc_dev_to_engine(dev);
	unsigned long thresh;

	if (kstrtoul(buf, 0, &thresh))
		return -EINVAL;

	thresh = clamp(thresh, 1UL, engine->fifo_sz - 1);

	engine->stat_irq_thresh = thresh;
	writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
	       engine->regs + SPA_IRQ_CTRL_REG_OFFSET);

	return len;
}
static DEVICE_ATTR(stat_irq_thresh, 0644, spacc_stat_irq_thresh_show,
		   spacc_stat_irq_thresh_store);

static struct spacc_alg ipsec_engine_algs[] = {
	{
		.ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_CBC,
		.key_offs = 0,
		.iv_offs = AES_MAX_KEY_SIZE,
		.alg = {
			.base.cra_name		= "cbc(aes)",
			.base.cra_driver_name	= "cbc-aes-picoxcell",
			.base.cra_priority	= SPACC_CRYPTO_ALG_PRIORITY,
			.base.cra_flags		= CRYPTO_ALG_KERN_DRIVER_ONLY |
						  CRYPTO_ALG_ASYNC |
						  CRYPTO_ALG_ALLOCATES_MEMORY |
						  CRYPTO_ALG_NEED_FALLBACK,
			.base.cra_blocksize	= AES_BLOCK_SIZE,
			.base.cra_ctxsize	= sizeof(struct spacc_ablk_ctx),
			.base.cra_module	= THIS_MODULE,

			.setkey			= spacc_aes_setkey,
			.encrypt 		= spacc_ablk_encrypt,
			.decrypt 		= spacc_ablk_decrypt,
			.min_keysize 		= AES_MIN_KEY_SIZE,
			.max_keysize 		= AES_MAX_KEY_SIZE,
			.ivsize			= AES_BLOCK_SIZE,
			.init			= spacc_ablk_init_tfm,
			.exit			= spacc_ablk_exit_tfm,
		},
	},
	{
		.key_offs = 0,
		.iv_offs = AES_MAX_KEY_SIZE,
		.ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_ECB,
		.alg = {
			.base.cra_name		= "ecb(aes)",
			.base.cra_driver_name	= "ecb-aes-picoxcell",
			.base.cra_priority	= SPACC_CRYPTO_ALG_PRIORITY,
			.base.cra_flags		= CRYPTO_ALG_KERN_DRIVER_ONLY |
						  CRYPTO_ALG_ASYNC |
						  CRYPTO_ALG_ALLOCATES_MEMORY |
						  CRYPTO_ALG_NEED_FALLBACK,
			.base.cra_blocksize	= AES_BLOCK_SIZE,
			.base.cra_ctxsize	= sizeof(struct spacc_ablk_ctx),
			.base.cra_module	= THIS_MODULE,

			.setkey			= spacc_aes_setkey,
			.encrypt 		= spacc_ablk_encrypt,
			.decrypt 		= spacc_ablk_decrypt,
			.min_keysize 		= AES_MIN_KEY_SIZE,
			.max_keysize 		= AES_MAX_KEY_SIZE,
			.init			= spacc_ablk_init_tfm,
			.exit			= spacc_ablk_exit_tfm,
		},
	},
	{
		.key_offs = DES_BLOCK_SIZE,
		.iv_offs = 0,
		.ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
		.alg = {
			.base.cra_name		= "cbc(des)",
			.base.cra_driver_name	= "cbc-des-picoxcell",
			.base.cra_priority	= SPACC_CRYPTO_ALG_PRIORITY,
			.base.cra_flags		= CRYPTO_ALG_KERN_DRIVER_ONLY |
						  CRYPTO_ALG_ASYNC |
						  CRYPTO_ALG_ALLOCATES_MEMORY,
			.base.cra_blocksize	= DES_BLOCK_SIZE,
			.base.cra_ctxsize	= sizeof(struct spacc_ablk_ctx),
			.base.cra_module	= THIS_MODULE,

			.setkey			= spacc_des_setkey,
			.encrypt		= spacc_ablk_encrypt,
			.decrypt		= spacc_ablk_decrypt,
			.min_keysize		= DES_KEY_SIZE,
			.max_keysize		= DES_KEY_SIZE,
			.ivsize			= DES_BLOCK_SIZE,
			.init			= spacc_ablk_init_tfm,
			.exit			= spacc_ablk_exit_tfm,
		},
	},
	{
		.key_offs = DES_BLOCK_SIZE,
		.iv_offs = 0,
		.ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
		.alg = {
			.base.cra_name		= "ecb(des)",
			.base.cra_driver_name	= "ecb-des-picoxcell",
			.base.cra_priority	= SPACC_CRYPTO_ALG_PRIORITY,
			.base.cra_flags		= CRYPTO_ALG_KERN_DRIVER_ONLY |
						  CRYPTO_ALG_ASYNC |
						  CRYPTO_ALG_ALLOCATES_MEMORY,
			.base.cra_blocksize	= DES_BLOCK_SIZE,
			.base.cra_ctxsize	= sizeof(struct spacc_ablk_ctx),
			.base.cra_module	= THIS_MODULE,

			.setkey			= spacc_des_setkey,
			.encrypt		= spacc_ablk_encrypt,
			.decrypt		= spacc_ablk_decrypt,
			.min_keysize		= DES_KEY_SIZE,
			.max_keysize		= DES_KEY_SIZE,
			.init			= spacc_ablk_init_tfm,
			.exit			= spacc_ablk_exit_tfm,
		},
	},
	{
		.key_offs = DES_BLOCK_SIZE,
		.iv_offs = 0,
		.ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
		.alg = {
			.base.cra_name		= "cbc(des3_ede)",
			.base.cra_driver_name	= "cbc-des3-ede-picoxcell",
			.base.cra_priority	= SPACC_CRYPTO_ALG_PRIORITY,
			.base.cra_flags		= CRYPTO_ALG_ASYNC |
						  CRYPTO_ALG_ALLOCATES_MEMORY |
						  CRYPTO_ALG_KERN_DRIVER_ONLY,
			.base.cra_blocksize	= DES3_EDE_BLOCK_SIZE,
			.base.cra_ctxsize	= sizeof(struct spacc_ablk_ctx),
			.base.cra_module	= THIS_MODULE,

			.setkey			= spacc_des3_setkey,
			.encrypt		= spacc_ablk_encrypt,
			.decrypt		= spacc_ablk_decrypt,
			.min_keysize		= DES3_EDE_KEY_SIZE,
			.max_keysize		= DES3_EDE_KEY_SIZE,
			.ivsize			= DES3_EDE_BLOCK_SIZE,
			.init			= spacc_ablk_init_tfm,
			.exit			= spacc_ablk_exit_tfm,
		},
	},
	{
		.key_offs = DES_BLOCK_SIZE,
		.iv_offs = 0,
		.ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
		.alg = {
			.base.cra_name		= "ecb(des3_ede)",
			.base.cra_driver_name	= "ecb-des3-ede-picoxcell",
			.base.cra_priority	= SPACC_CRYPTO_ALG_PRIORITY,
			.base.cra_flags		= CRYPTO_ALG_ASYNC |
						  CRYPTO_ALG_ALLOCATES_MEMORY |
						  CRYPTO_ALG_KERN_DRIVER_ONLY,
			.base.cra_blocksize	= DES3_EDE_BLOCK_SIZE,
			.base.cra_ctxsize	= sizeof(struct spacc_ablk_ctx),
			.base.cra_module	= THIS_MODULE,

			.setkey			= spacc_des3_setkey,
			.encrypt		= spacc_ablk_encrypt,
			.decrypt		= spacc_ablk_decrypt,
			.min_keysize		= DES3_EDE_KEY_SIZE,
			.max_keysize		= DES3_EDE_KEY_SIZE,
			.init			= spacc_ablk_init_tfm,
			.exit			= spacc_ablk_exit_tfm,
		},
	},
};

static struct spacc_aead ipsec_engine_aeads[] = {
	{
		.ctrl_default = SPA_CTRL_CIPH_ALG_AES |
				SPA_CTRL_CIPH_MODE_CBC |
				SPA_CTRL_HASH_ALG_SHA |
				SPA_CTRL_HASH_MODE_HMAC,
		.key_offs = 0,
		.iv_offs = AES_MAX_KEY_SIZE,
		.alg = {
			.base = {
				.cra_name = "authenc(hmac(sha1),cbc(aes))",
				.cra_driver_name = "authenc-hmac-sha1-"
						   "cbc-aes-picoxcell",
				.cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
				.cra_flags = CRYPTO_ALG_ASYNC |
					     CRYPTO_ALG_ALLOCATES_MEMORY |
					     CRYPTO_ALG_NEED_FALLBACK |
					     CRYPTO_ALG_KERN_DRIVER_ONLY,
				.cra_blocksize = AES_BLOCK_SIZE,
				.cra_ctxsize = sizeof(struct spacc_aead_ctx),
				.cra_module = THIS_MODULE,
			},
			.setkey = spacc_aead_setkey,
			.setauthsize = spacc_aead_setauthsize,
			.encrypt = spacc_aead_encrypt,
			.decrypt = spacc_aead_decrypt,
			.ivsize = AES_BLOCK_SIZE,
			.maxauthsize = SHA1_DIGEST_SIZE,
			.init = spacc_aead_cra_init,
			.exit = spacc_aead_cra_exit,
		},
	},
	{
		.ctrl_default = SPA_CTRL_CIPH_ALG_AES |
				SPA_CTRL_CIPH_MODE_CBC |
				SPA_CTRL_HASH_ALG_SHA256 |
				SPA_CTRL_HASH_MODE_HMAC,
		.key_offs = 0,
		.iv_offs = AES_MAX_KEY_SIZE,
		.alg = {
			.base = {
				.cra_name = "authenc(hmac(sha256),cbc(aes))",
				.cra_driver_name = "authenc-hmac-sha256-"
						   "cbc-aes-picoxcell",
				.cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
				.cra_flags = CRYPTO_ALG_ASYNC |
					     CRYPTO_ALG_ALLOCATES_MEMORY |
					     CRYPTO_ALG_NEED_FALLBACK |
					     CRYPTO_ALG_KERN_DRIVER_ONLY,
				.cra_blocksize = AES_BLOCK_SIZE,
				.cra_ctxsize = sizeof(struct spacc_aead_ctx),
				.cra_module = THIS_MODULE,
			},
			.setkey = spacc_aead_setkey,
			.setauthsize = spacc_aead_setauthsize,
			.encrypt = spacc_aead_encrypt,
			.decrypt = spacc_aead_decrypt,
			.ivsize = AES_BLOCK_SIZE,
			.maxauthsize = SHA256_DIGEST_SIZE,
			.init = spacc_aead_cra_init,
			.exit = spacc_aead_cra_exit,
		},
	},
	{
		.key_offs = 0,
		.iv_offs = AES_MAX_KEY_SIZE,
		.ctrl_default = SPA_CTRL_CIPH_ALG_AES |
				SPA_CTRL_CIPH_MODE_CBC |
				SPA_CTRL_HASH_ALG_MD5 |
				SPA_CTRL_HASH_MODE_HMAC,
		.alg = {
			.base = {
				.cra_name = "authenc(hmac(md5),cbc(aes))",
				.cra_driver_name = "authenc-hmac-md5-"
						   "cbc-aes-picoxcell",
				.cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
				.cra_flags = CRYPTO_ALG_ASYNC |
					     CRYPTO_ALG_ALLOCATES_MEMORY |
					     CRYPTO_ALG_NEED_FALLBACK |
					     CRYPTO_ALG_KERN_DRIVER_ONLY,
				.cra_blocksize = AES_BLOCK_SIZE,
				.cra_ctxsize = sizeof(struct spacc_aead_ctx),
				.cra_module = THIS_MODULE,
			},
			.setkey = spacc_aead_setkey,
			.setauthsize = spacc_aead_setauthsize,
			.encrypt = spacc_aead_encrypt,
			.decrypt = spacc_aead_decrypt,
			.ivsize = AES_BLOCK_SIZE,
			.maxauthsize = MD5_DIGEST_SIZE,
			.init = spacc_aead_cra_init,
			.exit = spacc_aead_cra_exit,
		},
	},
	{
		.key_offs = DES_BLOCK_SIZE,
		.iv_offs = 0,
		.ctrl_default = SPA_CTRL_CIPH_ALG_DES |
				SPA_CTRL_CIPH_MODE_CBC |
				SPA_CTRL_HASH_ALG_SHA |
				SPA_CTRL_HASH_MODE_HMAC,
		.alg = {
			.base = {
				.cra_name = "authenc(hmac(sha1),cbc(des3_ede))",
				.cra_driver_name = "authenc-hmac-sha1-"
						   "cbc-3des-picoxcell",
				.cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
				.cra_flags = CRYPTO_ALG_ASYNC |
					     CRYPTO_ALG_ALLOCATES_MEMORY |
					     CRYPTO_ALG_NEED_FALLBACK |
					     CRYPTO_ALG_KERN_DRIVER_ONLY,
				.cra_blocksize = DES3_EDE_BLOCK_SIZE,
				.cra_ctxsize = sizeof(struct spacc_aead_ctx),
				.cra_module = THIS_MODULE,
			},
			.setkey = spacc_aead_setkey,
			.setauthsize = spacc_aead_setauthsize,
			.encrypt = spacc_aead_encrypt,
			.decrypt = spacc_aead_decrypt,
			.ivsize = DES3_EDE_BLOCK_SIZE,
			.maxauthsize = SHA1_DIGEST_SIZE,
			.init = spacc_aead_cra_init,
			.exit = spacc_aead_cra_exit,
		},
	},
	{
		.key_offs = DES_BLOCK_SIZE,
		.iv_offs = 0,
		.ctrl_default = SPA_CTRL_CIPH_ALG_AES |
				SPA_CTRL_CIPH_MODE_CBC |
				SPA_CTRL_HASH_ALG_SHA256 |
				SPA_CTRL_HASH_MODE_HMAC,
		.alg = {
			.base = {
				.cra_name = "authenc(hmac(sha256),"
					    "cbc(des3_ede))",
				.cra_driver_name = "authenc-hmac-sha256-"
						   "cbc-3des-picoxcell",
				.cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
				.cra_flags = CRYPTO_ALG_ASYNC |
					     CRYPTO_ALG_ALLOCATES_MEMORY |
					     CRYPTO_ALG_NEED_FALLBACK |
					     CRYPTO_ALG_KERN_DRIVER_ONLY,
				.cra_blocksize = DES3_EDE_BLOCK_SIZE,
				.cra_ctxsize = sizeof(struct spacc_aead_ctx),
				.cra_module = THIS_MODULE,
			},
			.setkey = spacc_aead_setkey,
			.setauthsize = spacc_aead_setauthsize,
			.encrypt = spacc_aead_encrypt,
			.decrypt = spacc_aead_decrypt,
			.ivsize = DES3_EDE_BLOCK_SIZE,
			.maxauthsize = SHA256_DIGEST_SIZE,
			.init = spacc_aead_cra_init,
			.exit = spacc_aead_cra_exit,
		},
	},
	{
		.key_offs = DES_BLOCK_SIZE,
		.iv_offs = 0,
		.ctrl_default = SPA_CTRL_CIPH_ALG_DES |
				SPA_CTRL_CIPH_MODE_CBC |
				SPA_CTRL_HASH_ALG_MD5 |
				SPA_CTRL_HASH_MODE_HMAC,
		.alg = {
			.base = {
				.cra_name = "authenc(hmac(md5),cbc(des3_ede))",
				.cra_driver_name = "authenc-hmac-md5-"
						   "cbc-3des-picoxcell",
				.cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
				.cra_flags = CRYPTO_ALG_ASYNC |
					     CRYPTO_ALG_ALLOCATES_MEMORY |
					     CRYPTO_ALG_NEED_FALLBACK |
					     CRYPTO_ALG_KERN_DRIVER_ONLY,
				.cra_blocksize = DES3_EDE_BLOCK_SIZE,
				.cra_ctxsize = sizeof(struct spacc_aead_ctx),
				.cra_module = THIS_MODULE,
			},
			.setkey = spacc_aead_setkey,
			.setauthsize = spacc_aead_setauthsize,
			.encrypt = spacc_aead_encrypt,
			.decrypt = spacc_aead_decrypt,
			.ivsize = DES3_EDE_BLOCK_SIZE,
			.maxauthsize = MD5_DIGEST_SIZE,
			.init = spacc_aead_cra_init,
			.exit = spacc_aead_cra_exit,
		},
	},
};

static struct spacc_alg l2_engine_algs[] = {
	{
		.key_offs = 0,
		.iv_offs = SPACC_CRYPTO_KASUMI_F8_KEY_LEN,
		.ctrl_default = SPA_CTRL_CIPH_ALG_KASUMI |
				SPA_CTRL_CIPH_MODE_F8,
		.alg = {
			.base.cra_name		= "f8(kasumi)",
			.base.cra_driver_name	= "f8-kasumi-picoxcell",
			.base.cra_priority	= SPACC_CRYPTO_ALG_PRIORITY,
			.base.cra_flags		= CRYPTO_ALG_ASYNC |
						  CRYPTO_ALG_ALLOCATES_MEMORY |
						  CRYPTO_ALG_KERN_DRIVER_ONLY,
			.base.cra_blocksize	= 8,
			.base.cra_ctxsize	= sizeof(struct spacc_ablk_ctx),
			.base.cra_module	= THIS_MODULE,

			.setkey			= spacc_kasumi_f8_setkey,
			.encrypt		= spacc_ablk_encrypt,
			.decrypt		= spacc_ablk_decrypt,
			.min_keysize		= 16,
			.max_keysize		= 16,
			.ivsize			= 8,
			.init			= spacc_ablk_init_tfm,
			.exit			= spacc_ablk_exit_tfm,
		},
	},
};

#ifdef CONFIG_OF
static const struct of_device_id spacc_of_id_table[] = {
	{ .compatible = "picochip,spacc-ipsec" },
	{ .compatible = "picochip,spacc-l2" },
	{}
};
MODULE_DEVICE_TABLE(of, spacc_of_id_table);
#endif /* CONFIG_OF */

static void spacc_tasklet_kill(void *data)
{
	tasklet_kill(data);
}

static int spacc_probe(struct platform_device *pdev)
{
	int i, err, ret;
	struct resource *irq;
	struct device_node *np = pdev->dev.of_node;
	struct spacc_engine *engine = devm_kzalloc(&pdev->dev, sizeof(*engine),
						   GFP_KERNEL);
	if (!engine)
		return -ENOMEM;

	if (of_device_is_compatible(np, "picochip,spacc-ipsec")) {
		engine->max_ctxs	= SPACC_CRYPTO_IPSEC_MAX_CTXS;
		engine->cipher_pg_sz	= SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ;
		engine->hash_pg_sz	= SPACC_CRYPTO_IPSEC_HASH_PG_SZ;
		engine->fifo_sz		= SPACC_CRYPTO_IPSEC_FIFO_SZ;
		engine->algs		= ipsec_engine_algs;
		engine->num_algs	= ARRAY_SIZE(ipsec_engine_algs);
		engine->aeads		= ipsec_engine_aeads;
		engine->num_aeads	= ARRAY_SIZE(ipsec_engine_aeads);
	} else if (of_device_is_compatible(np, "picochip,spacc-l2")) {
		engine->max_ctxs	= SPACC_CRYPTO_L2_MAX_CTXS;
		engine->cipher_pg_sz	= SPACC_CRYPTO_L2_CIPHER_PG_SZ;
		engine->hash_pg_sz	= SPACC_CRYPTO_L2_HASH_PG_SZ;
		engine->fifo_sz		= SPACC_CRYPTO_L2_FIFO_SZ;
		engine->algs		= l2_engine_algs;
		engine->num_algs	= ARRAY_SIZE(l2_engine_algs);
	} else {
		return -EINVAL;
	}

	engine->name = dev_name(&pdev->dev);

	engine->regs = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(engine->regs))
		return PTR_ERR(engine->regs);

	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!irq) {
		dev_err(&pdev->dev, "no memory/irq resource for engine\n");
		return -ENXIO;
	}

	tasklet_init(&engine->complete, spacc_spacc_complete,
		     (unsigned long)engine);

	ret = devm_add_action(&pdev->dev, spacc_tasklet_kill,
			      &engine->complete);
	if (ret)
		return ret;

	if (devm_request_irq(&pdev->dev, irq->start, spacc_spacc_irq, 0,
			     engine->name, engine)) {
		dev_err(engine->dev, "failed to request IRQ\n");
		return -EBUSY;
	}

	engine->dev		= &pdev->dev;
	engine->cipher_ctx_base = engine->regs + SPA_CIPH_KEY_BASE_REG_OFFSET;
	engine->hash_key_base	= engine->regs + SPA_HASH_KEY_BASE_REG_OFFSET;

	engine->req_pool = dmam_pool_create(engine->name, engine->dev,
		MAX_DDT_LEN * sizeof(struct spacc_ddt), 8, SZ_64K);
	if (!engine->req_pool)
		return -ENOMEM;

	spin_lock_init(&engine->hw_lock);

	engine->clk = clk_get(&pdev->dev, "ref");
	if (IS_ERR(engine->clk)) {
		dev_info(&pdev->dev, "clk unavailable\n");
		return PTR_ERR(engine->clk);
	}

	if (clk_prepare_enable(engine->clk)) {
		dev_info(&pdev->dev, "unable to prepare/enable clk\n");
		ret = -EIO;
		goto err_clk_put;
	}

	/*
	 * Use an IRQ threshold of 50% as a default. This seems to be a
	 * reasonable trade off of latency against throughput but can be
	 * changed at runtime.
	 */
	engine->stat_irq_thresh = (engine->fifo_sz / 2);

	ret = device_create_file(&pdev->dev, &dev_attr_stat_irq_thresh);
	if (ret)
		goto err_clk_disable;

	/*
	 * Configure the interrupts. We only use the STAT_CNT interrupt as we
	 * only submit a new packet for processing when we complete another in
	 * the queue. This minimizes time spent in the interrupt handler.
	 */
	writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
	       engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
	writel(SPA_IRQ_EN_STAT_EN | SPA_IRQ_EN_GLBL_EN,
	       engine->regs + SPA_IRQ_EN_REG_OFFSET);

	timer_setup(&engine->packet_timeout, spacc_packet_timeout, 0);

	INIT_LIST_HEAD(&engine->pending);
	INIT_LIST_HEAD(&engine->completed);
	INIT_LIST_HEAD(&engine->in_progress);
	engine->in_flight = 0;

	platform_set_drvdata(pdev, engine);

	ret = -EINVAL;
	INIT_LIST_HEAD(&engine->registered_algs);
	for (i = 0; i < engine->num_algs; ++i) {
		engine->algs[i].engine = engine;
		err = crypto_register_skcipher(&engine->algs[i].alg);
		if (!err) {
			list_add_tail(&engine->algs[i].entry,
				      &engine->registered_algs);
			ret = 0;
		}
		if (err)
			dev_err(engine->dev, "failed to register alg \"%s\"\n",
				engine->algs[i].alg.base.cra_name);
		else
			dev_dbg(engine->dev, "registered alg \"%s\"\n",
				engine->algs[i].alg.base.cra_name);
	}

	INIT_LIST_HEAD(&engine->registered_aeads);
	for (i = 0; i < engine->num_aeads; ++i) {
		engine->aeads[i].engine = engine;
		err = crypto_register_aead(&engine->aeads[i].alg);
		if (!err) {
			list_add_tail(&engine->aeads[i].entry,
				      &engine->registered_aeads);
			ret = 0;
		}
		if (err)
			dev_err(engine->dev, "failed to register alg \"%s\"\n",
				engine->aeads[i].alg.base.cra_name);
		else
			dev_dbg(engine->dev, "registered alg \"%s\"\n",
				engine->aeads[i].alg.base.cra_name);
	}

	if (!ret)
		return 0;

	del_timer_sync(&engine->packet_timeout);
	device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
err_clk_disable:
	clk_disable_unprepare(engine->clk);
err_clk_put:
	clk_put(engine->clk);

	return ret;
}

static int spacc_remove(struct platform_device *pdev)
{
	struct spacc_aead *aead, *an;
	struct spacc_alg *alg, *next;
	struct spacc_engine *engine = platform_get_drvdata(pdev);

	del_timer_sync(&engine->packet_timeout);
	device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);

	list_for_each_entry_safe(aead, an, &engine->registered_aeads, entry) {
		list_del(&aead->entry);
		crypto_unregister_aead(&aead->alg);
	}

	list_for_each_entry_safe(alg, next, &engine->registered_algs, entry) {
		list_del(&alg->entry);
		crypto_unregister_skcipher(&alg->alg);
	}

	clk_disable_unprepare(engine->clk);
	clk_put(engine->clk);

	return 0;
}

static struct platform_driver spacc_driver = {
	.probe		= spacc_probe,
	.remove		= spacc_remove,
	.driver		= {
		.name	= "picochip,spacc",
#ifdef CONFIG_PM
		.pm	= &spacc_pm_ops,
#endif /* CONFIG_PM */
		.of_match_table	= of_match_ptr(spacc_of_id_table),
	},
};

module_platform_driver(spacc_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jamie Iles");