// SPDX-License-Identifier: GPL-2.0-only
/*
 *   Driver for ARTPEC-6 crypto block using the kernel asynchronous crypto api.
 *
 *    Copyright (C) 2014-2017  Axis Communications AB
 */
#define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt

#include <linux/bitfield.h>
#include <linux/crypto.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/fault-inject.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>

#include <crypto/aes.h>
#include <crypto/gcm.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <crypto/sha.h>
#include <crypto/xts.h>

/* Max length of a line in all cache levels for Artpec SoCs. */
#define ARTPEC_CACHE_LINE_MAX   32

#define PDMA_OUT_CFG            0x0000
#define PDMA_OUT_BUF_CFG        0x0004
#define PDMA_OUT_CMD            0x0008
#define PDMA_OUT_DESCRQ_PUSH    0x0010
#define PDMA_OUT_DESCRQ_STAT    0x0014

#define A6_PDMA_IN_CFG          0x0028
#define A6_PDMA_IN_BUF_CFG      0x002c
#define A6_PDMA_IN_CMD          0x0030
#define A6_PDMA_IN_STATQ_PUSH   0x0038
#define A6_PDMA_IN_DESCRQ_PUSH  0x0044
#define A6_PDMA_IN_DESCRQ_STAT  0x0048
#define A6_PDMA_INTR_MASK       0x0068
#define A6_PDMA_ACK_INTR        0x006c
#define A6_PDMA_MASKED_INTR     0x0074

#define A7_PDMA_IN_CFG          0x002c
#define A7_PDMA_IN_BUF_CFG      0x0030
#define A7_PDMA_IN_CMD          0x0034
#define A7_PDMA_IN_STATQ_PUSH   0x003c
#define A7_PDMA_IN_DESCRQ_PUSH  0x0048
#define A7_PDMA_IN_DESCRQ_STAT  0x004C
#define A7_PDMA_INTR_MASK       0x006c
#define A7_PDMA_ACK_INTR        0x0070
#define A7_PDMA_MASKED_INTR     0x0078

#define PDMA_OUT_CFG_EN                         BIT(0)

#define PDMA_OUT_BUF_CFG_DATA_BUF_SIZE          GENMASK(4, 0)
#define PDMA_OUT_BUF_CFG_DESCR_BUF_SIZE         GENMASK(9, 5)

#define PDMA_OUT_CMD_START                      BIT(0)
#define A6_PDMA_OUT_CMD_STOP                    BIT(3)
#define A7_PDMA_OUT_CMD_STOP                    BIT(2)

#define PDMA_OUT_DESCRQ_PUSH_LEN                GENMASK(5, 0)
#define PDMA_OUT_DESCRQ_PUSH_ADDR               GENMASK(31, 6)

#define PDMA_OUT_DESCRQ_STAT_LEVEL              GENMASK(3, 0)
#define PDMA_OUT_DESCRQ_STAT_SIZE               GENMASK(7, 4)

#define PDMA_IN_CFG_EN                          BIT(0)

#define PDMA_IN_BUF_CFG_DATA_BUF_SIZE           GENMASK(4, 0)
#define PDMA_IN_BUF_CFG_DESCR_BUF_SIZE          GENMASK(9, 5)
#define PDMA_IN_BUF_CFG_STAT_BUF_SIZE           GENMASK(14, 10)

#define PDMA_IN_CMD_START                       BIT(0)
#define A6_PDMA_IN_CMD_FLUSH_STAT               BIT(2)
#define A6_PDMA_IN_CMD_STOP                     BIT(3)
#define A7_PDMA_IN_CMD_FLUSH_STAT               BIT(1)
#define A7_PDMA_IN_CMD_STOP                     BIT(2)

#define PDMA_IN_STATQ_PUSH_LEN                  GENMASK(5, 0)
#define PDMA_IN_STATQ_PUSH_ADDR                 GENMASK(31, 6)

#define PDMA_IN_DESCRQ_PUSH_LEN                 GENMASK(5, 0)
#define PDMA_IN_DESCRQ_PUSH_ADDR                GENMASK(31, 6)

#define PDMA_IN_DESCRQ_STAT_LEVEL               GENMASK(3, 0)
#define PDMA_IN_DESCRQ_STAT_SIZE                GENMASK(7, 4)

#define A6_PDMA_INTR_MASK_IN_DATA               BIT(2)
#define A6_PDMA_INTR_MASK_IN_EOP                BIT(3)
#define A6_PDMA_INTR_MASK_IN_EOP_FLUSH          BIT(4)

#define A7_PDMA_INTR_MASK_IN_DATA               BIT(3)
#define A7_PDMA_INTR_MASK_IN_EOP                BIT(4)
#define A7_PDMA_INTR_MASK_IN_EOP_FLUSH          BIT(5)

#define A6_CRY_MD_OPER          GENMASK(19, 16)

#define A6_CRY_MD_HASH_SEL_CTX  GENMASK(21, 20)
#define A6_CRY_MD_HASH_HMAC_FIN BIT(23)

#define A6_CRY_MD_CIPHER_LEN    GENMASK(21, 20)
#define A6_CRY_MD_CIPHER_DECR   BIT(22)
#define A6_CRY_MD_CIPHER_TWEAK  BIT(23)
#define A6_CRY_MD_CIPHER_DSEQ   BIT(24)

#define A7_CRY_MD_OPER          GENMASK(11, 8)

#define A7_CRY_MD_HASH_SEL_CTX  GENMASK(13, 12)
#define A7_CRY_MD_HASH_HMAC_FIN BIT(15)

#define A7_CRY_MD_CIPHER_LEN    GENMASK(13, 12)
#define A7_CRY_MD_CIPHER_DECR   BIT(14)
#define A7_CRY_MD_CIPHER_TWEAK  BIT(15)
#define A7_CRY_MD_CIPHER_DSEQ   BIT(16)

/* DMA metadata constants */
#define regk_crypto_aes_cbc     0x00000002
#define regk_crypto_aes_ctr     0x00000003
#define regk_crypto_aes_ecb     0x00000001
#define regk_crypto_aes_gcm     0x00000004
#define regk_crypto_aes_xts     0x00000005
#define regk_crypto_cache       0x00000002
#define a6_regk_crypto_dlkey    0x0000000a
#define a7_regk_crypto_dlkey    0x0000000e
#define regk_crypto_ext         0x00000001
#define regk_crypto_hmac_sha1   0x00000007
#define regk_crypto_hmac_sha256 0x00000009
#define regk_crypto_init        0x00000000
#define regk_crypto_key_128     0x00000000
#define regk_crypto_key_192     0x00000001
#define regk_crypto_key_256     0x00000002
#define regk_crypto_null        0x00000000
#define regk_crypto_sha1        0x00000006
#define regk_crypto_sha256      0x00000008

/* DMA descriptor structures */
struct pdma_descr_ctrl  {
        unsigned char short_descr : 1;
        unsigned char pad1        : 1;
        unsigned char eop         : 1;
        unsigned char intr        : 1;
        unsigned char short_len   : 3;
        unsigned char pad2        : 1;
} __packed;

struct pdma_data_descr {
        unsigned int len : 24;
        unsigned int buf : 32;
} __packed;

struct pdma_short_descr {
        unsigned char data[7];
} __packed;

struct pdma_descr {
        struct pdma_descr_ctrl ctrl;
        union {
                struct pdma_data_descr   data;
                struct pdma_short_descr  shrt;
        };
};

struct pdma_stat_descr {
        unsigned char pad1        : 1;
        unsigned char pad2        : 1;
        unsigned char eop         : 1;
        unsigned char pad3        : 5;
        unsigned int  len         : 24;
};

/* Each descriptor array can hold max 64 entries */
#define PDMA_DESCR_COUNT        64

#define MODULE_NAME   "Artpec-6 CA"

/* Hash modes (including HMAC variants) */
#define ARTPEC6_CRYPTO_HASH_SHA1        1
#define ARTPEC6_CRYPTO_HASH_SHA256      2

/* Crypto modes */
#define ARTPEC6_CRYPTO_CIPHER_AES_ECB   1
#define ARTPEC6_CRYPTO_CIPHER_AES_CBC   2
#define ARTPEC6_CRYPTO_CIPHER_AES_CTR   3
#define ARTPEC6_CRYPTO_CIPHER_AES_XTS   5

/* The PDMA is a DMA-engine tightly coupled with a ciphering engine.
 * It operates on a descriptor array with up to 64 descriptor entries.
 * The arrays must be 64 byte aligned in memory.
 *
 * The ciphering unit has no registers and is completely controlled by
 * a 4-byte metadata that is inserted at the beginning of each dma packet.
 *
 * A dma packet is a sequence of descriptors terminated by setting the .eop
 * field in the final descriptor of the packet.
 *
 * Multiple packets are used for providing context data, key data and
 * the plain/ciphertext.
 *
 *   PDMA Descriptors (Array)
 *  +------+------+------+~~+-------+------+----
 *  |  0   |  1   |  2   |~~| 11 EOP|  12  |  ....
 *  +--+---+--+---+----+-+~~+-------+----+-+----
 *     |      |        |       |         |
 *     |      |        |       |         |
 *   __|__  +-------++-------++-------+ +----+
 *  | MD  | |Payload||Payload||Payload| | MD |
 *  +-----+ +-------++-------++-------+ +----+
 */

struct artpec6_crypto_bounce_buffer {
        struct list_head list;
        size_t length;
        struct scatterlist *sg;
        size_t offset;
        /* buf is aligned to ARTPEC_CACHE_LINE_MAX and
         * holds up to ARTPEC_CACHE_LINE_MAX bytes data.
         */
        void *buf;
};

struct artpec6_crypto_dma_map {
        dma_addr_t dma_addr;
        size_t size;
        enum dma_data_direction dir;
};

struct artpec6_crypto_dma_descriptors {
        struct pdma_descr out[PDMA_DESCR_COUNT] __aligned(64);
        struct pdma_descr in[PDMA_DESCR_COUNT] __aligned(64);
        u32 stat[PDMA_DESCR_COUNT] __aligned(64);
        struct list_head bounce_buffers;
        /* Enough maps for all out/in buffers, and all three descr. arrays */
        struct artpec6_crypto_dma_map maps[PDMA_DESCR_COUNT * 2 + 2];
        dma_addr_t out_dma_addr;
        dma_addr_t in_dma_addr;
        dma_addr_t stat_dma_addr;
        size_t out_cnt;
        size_t in_cnt;
        size_t map_count;
};

enum artpec6_crypto_variant {
        ARTPEC6_CRYPTO,
        ARTPEC7_CRYPTO,
};

struct artpec6_crypto {
        void __iomem *base;
        spinlock_t queue_lock;
        struct list_head queue; /* waiting for pdma fifo space */
        struct list_head pending; /* submitted to pdma fifo */
        struct tasklet_struct task;
        struct kmem_cache *dma_cache;
        int pending_count;
        struct timer_list timer;
        enum artpec6_crypto_variant variant;
        void *pad_buffer; /* cache-aligned block padding buffer */
        void *zero_buffer;
};

enum artpec6_crypto_hash_flags {
        HASH_FLAG_INIT_CTX = 2,
        HASH_FLAG_UPDATE = 4,
        HASH_FLAG_FINALIZE = 8,
        HASH_FLAG_HMAC = 16,
        HASH_FLAG_UPDATE_KEY = 32,
};

struct artpec6_crypto_req_common {
        struct list_head list;
        struct list_head complete_in_progress;
        struct artpec6_crypto_dma_descriptors *dma;
        struct crypto_async_request *req;
        void (*complete)(struct crypto_async_request *req);
        gfp_t gfp_flags;
};

struct artpec6_hash_request_context {
        char partial_buffer[SHA256_BLOCK_SIZE];
        char partial_buffer_out[SHA256_BLOCK_SIZE];
        char key_buffer[SHA256_BLOCK_SIZE];
        char pad_buffer[SHA256_BLOCK_SIZE + 32];
        unsigned char digeststate[SHA256_DIGEST_SIZE];
        size_t partial_bytes;
        u64 digcnt;
        u32 key_md;
        u32 hash_md;
        enum artpec6_crypto_hash_flags hash_flags;
        struct artpec6_crypto_req_common common;
};

struct artpec6_hash_export_state {
        char partial_buffer[SHA256_BLOCK_SIZE];
        unsigned char digeststate[SHA256_DIGEST_SIZE];
        size_t partial_bytes;
        u64 digcnt;
        int oper;
        unsigned int hash_flags;
};

struct artpec6_hashalg_context {
        char hmac_key[SHA256_BLOCK_SIZE];
        size_t hmac_key_length;
        struct crypto_shash *child_hash;
};

struct artpec6_crypto_request_context {
        u32 cipher_md;
        bool decrypt;
        struct artpec6_crypto_req_common common;
};

struct artpec6_cryptotfm_context {
        unsigned char aes_key[2*AES_MAX_KEY_SIZE];
        size_t key_length;
        u32 key_md;
        int crypto_type;
        struct crypto_sync_skcipher *fallback;
};

struct artpec6_crypto_aead_hw_ctx {
        __be64  aad_length_bits;
        __be64  text_length_bits;
        __u8    J0[AES_BLOCK_SIZE];
};

struct artpec6_crypto_aead_req_ctx {
        struct artpec6_crypto_aead_hw_ctx hw_ctx;
        u32 cipher_md;
        bool decrypt;
        struct artpec6_crypto_req_common common;
        __u8 decryption_tag[AES_BLOCK_SIZE] ____cacheline_aligned;
};

/* The crypto framework makes it hard to avoid this global. */
static struct device *artpec6_crypto_dev;

#ifdef CONFIG_FAULT_INJECTION
static DECLARE_FAULT_ATTR(artpec6_crypto_fail_status_read);
static DECLARE_FAULT_ATTR(artpec6_crypto_fail_dma_array_full);
#endif

enum {
        ARTPEC6_CRYPTO_PREPARE_HASH_NO_START,
        ARTPEC6_CRYPTO_PREPARE_HASH_START,
};

static int artpec6_crypto_prepare_aead(struct aead_request *areq);
static int artpec6_crypto_prepare_crypto(struct skcipher_request *areq);
static int artpec6_crypto_prepare_hash(struct ahash_request *areq);

static void
artpec6_crypto_complete_crypto(struct crypto_async_request *req);
static void
artpec6_crypto_complete_cbc_encrypt(struct crypto_async_request *req);
static void
artpec6_crypto_complete_cbc_decrypt(struct crypto_async_request *req);
static void
artpec6_crypto_complete_aead(struct crypto_async_request *req);
static void
artpec6_crypto_complete_hash(struct crypto_async_request *req);

static int
artpec6_crypto_common_destroy(struct artpec6_crypto_req_common *common);

static void
artpec6_crypto_start_dma(struct artpec6_crypto_req_common *common);

struct artpec6_crypto_walk {
        struct scatterlist *sg;
        size_t offset;
};

static void artpec6_crypto_walk_init(struct artpec6_crypto_walk *awalk,
                                     struct scatterlist *sg)
{
        awalk->sg = sg;
        awalk->offset = 0;
}

static size_t artpec6_crypto_walk_advance(struct artpec6_crypto_walk *awalk,
                                          size_t nbytes)
{
        while (nbytes && awalk->sg) {
                size_t piece;

                WARN_ON(awalk->offset > awalk->sg->length);

                piece = min(nbytes, (size_t)awalk->sg->length - awalk->offset);
                nbytes -= piece;
                awalk->offset += piece;
                if (awalk->offset == awalk->sg->length) {
                        awalk->sg = sg_next(awalk->sg);
                        awalk->offset = 0;
                }

        }

        return nbytes;
}

static size_t
artpec6_crypto_walk_chunklen(const struct artpec6_crypto_walk *awalk)
{
        WARN_ON(awalk->sg->length == awalk->offset);

        return awalk->sg->length - awalk->offset;
}

static dma_addr_t
artpec6_crypto_walk_chunk_phys(const struct artpec6_crypto_walk *awalk)
{
        return sg_phys(awalk->sg) + awalk->offset;
}

static void
artpec6_crypto_copy_bounce_buffers(struct artpec6_crypto_req_common *common)
{
        struct artpec6_crypto_dma_descriptors *dma = common->dma;
        struct artpec6_crypto_bounce_buffer *b;
        struct artpec6_crypto_bounce_buffer *next;

        list_for_each_entry_safe(b, next, &dma->bounce_buffers, list) {
                pr_debug("bounce entry %p: %zu bytes @ %zu from %p\n",
                         b, b->length, b->offset, b->buf);
                sg_pcopy_from_buffer(b->sg,
                                   1,
                                   b->buf,
                                   b->length,
                                   b->offset);

                list_del(&b->list);
                kfree(b);
        }
}

static inline bool artpec6_crypto_busy(void)
{
        struct artpec6_crypto *ac = dev_get_drvdata(artpec6_crypto_dev);
        int fifo_count = ac->pending_count;

        return fifo_count > 6;
}

static int artpec6_crypto_submit(struct artpec6_crypto_req_common *req)
{
        struct artpec6_crypto *ac = dev_get_drvdata(artpec6_crypto_dev);
        int ret = -EBUSY;

        spin_lock_bh(&ac->queue_lock);

        if (!artpec6_crypto_busy()) {
                list_add_tail(&req->list, &ac->pending);
                artpec6_crypto_start_dma(req);
                ret = -EINPROGRESS;
        } else if (req->req->flags & CRYPTO_TFM_REQ_MAY_BACKLOG) {
                list_add_tail(&req->list, &ac->queue);
        } else {
                artpec6_crypto_common_destroy(req);
        }

        spin_unlock_bh(&ac->queue_lock);

        return ret;
}

static void artpec6_crypto_start_dma(struct artpec6_crypto_req_common *common)
{
        struct artpec6_crypto *ac = dev_get_drvdata(artpec6_crypto_dev);
        enum artpec6_crypto_variant variant = ac->variant;
        void __iomem *base = ac->base;
        struct artpec6_crypto_dma_descriptors *dma = common->dma;
        u32 ind, statd, outd;

        /* Make descriptor content visible to the DMA before starting it. */
        wmb();

        ind = FIELD_PREP(PDMA_IN_DESCRQ_PUSH_LEN, dma->in_cnt - 1) |
              FIELD_PREP(PDMA_IN_DESCRQ_PUSH_ADDR, dma->in_dma_addr >> 6);

        statd = FIELD_PREP(PDMA_IN_STATQ_PUSH_LEN, dma->in_cnt - 1) |
                FIELD_PREP(PDMA_IN_STATQ_PUSH_ADDR, dma->stat_dma_addr >> 6);

        outd = FIELD_PREP(PDMA_OUT_DESCRQ_PUSH_LEN, dma->out_cnt - 1) |
               FIELD_PREP(PDMA_OUT_DESCRQ_PUSH_ADDR, dma->out_dma_addr >> 6);

        if (variant == ARTPEC6_CRYPTO) {
                writel_relaxed(ind, base + A6_PDMA_IN_DESCRQ_PUSH);
                writel_relaxed(statd, base + A6_PDMA_IN_STATQ_PUSH);
                writel_relaxed(PDMA_IN_CMD_START, base + A6_PDMA_IN_CMD);
        } else {
                writel_relaxed(ind, base + A7_PDMA_IN_DESCRQ_PUSH);
                writel_relaxed(statd, base + A7_PDMA_IN_STATQ_PUSH);
                writel_relaxed(PDMA_IN_CMD_START, base + A7_PDMA_IN_CMD);
        }

        writel_relaxed(outd, base + PDMA_OUT_DESCRQ_PUSH);
        writel_relaxed(PDMA_OUT_CMD_START, base + PDMA_OUT_CMD);

        ac->pending_count++;
}

static void
artpec6_crypto_init_dma_operation(struct artpec6_crypto_req_common *common)
{
        struct artpec6_crypto_dma_descriptors *dma = common->dma;

        dma->out_cnt = 0;
        dma->in_cnt = 0;
        dma->map_count = 0;
        INIT_LIST_HEAD(&dma->bounce_buffers);
}

static bool fault_inject_dma_descr(void)
{
#ifdef CONFIG_FAULT_INJECTION
        return should_fail(&artpec6_crypto_fail_dma_array_full, 1);
#else
        return false;
#endif
}

/** artpec6_crypto_setup_out_descr_phys - Setup an out channel with a
 *                                        physical address
 *
 * @addr: The physical address of the data buffer
 * @len:  The length of the data buffer
 * @eop:  True if this is the last buffer in the packet
 *
 * @return 0 on success or -ENOSPC if there are no more descriptors available
 */
static int
artpec6_crypto_setup_out_descr_phys(struct artpec6_crypto_req_common *common,
                                    dma_addr_t addr, size_t len, bool eop)
{
        struct artpec6_crypto_dma_descriptors *dma = common->dma;
        struct pdma_descr *d;

        if (dma->out_cnt >= PDMA_DESCR_COUNT ||
            fault_inject_dma_descr()) {
                pr_err("No free OUT DMA descriptors available!\n");
                return -ENOSPC;
        }

        d = &dma->out[dma->out_cnt++];
        memset(d, 0, sizeof(*d));

        d->ctrl.short_descr = 0;
        d->ctrl.eop = eop;
        d->data.len = len;
        d->data.buf = addr;
        return 0;
}

/** artpec6_crypto_setup_out_descr_short - Setup a short out descriptor
 *
 * @dst: The virtual address of the data
 * @len: The length of the data, must be between 1 to 7 bytes
 * @eop: True if this is the last buffer in the packet
 *
 * @return 0 on success
 *      -ENOSPC if no more descriptors are available
 *      -EINVAL if the data length exceeds 7 bytes
 */
static int
artpec6_crypto_setup_out_descr_short(struct artpec6_crypto_req_common *common,
                                     void *dst, unsigned int len, bool eop)
{
        struct artpec6_crypto_dma_descriptors *dma = common->dma;
        struct pdma_descr *d;

        if (dma->out_cnt >= PDMA_DESCR_COUNT ||
            fault_inject_dma_descr()) {
                pr_err("No free OUT DMA descriptors available!\n");
                return -ENOSPC;
        } else if (len > 7 || len < 1) {
                return -EINVAL;
        }
        d = &dma->out[dma->out_cnt++];
        memset(d, 0, sizeof(*d));

        d->ctrl.short_descr = 1;
        d->ctrl.short_len = len;
        d->ctrl.eop = eop;
        memcpy(d->shrt.data, dst, len);
        return 0;
}

static int artpec6_crypto_dma_map_page(struct artpec6_crypto_req_common *common,
                                      struct page *page, size_t offset,
                                      size_t size,
                                      enum dma_data_direction dir,
                                      dma_addr_t *dma_addr_out)
{
        struct artpec6_crypto_dma_descriptors *dma = common->dma;
        struct device *dev = artpec6_crypto_dev;
        struct artpec6_crypto_dma_map *map;
        dma_addr_t dma_addr;

        *dma_addr_out = 0;

        if (dma->map_count >= ARRAY_SIZE(dma->maps))
                return -ENOMEM;

        dma_addr = dma_map_page(dev, page, offset, size, dir);
        if (dma_mapping_error(dev, dma_addr))
                return -ENOMEM;

        map = &dma->maps[dma->map_count++];
        map->size = size;
        map->dma_addr = dma_addr;
        map->dir = dir;

        *dma_addr_out = dma_addr;

        return 0;
}

static int
artpec6_crypto_dma_map_single(struct artpec6_crypto_req_common *common,
                              void *ptr, size_t size,
                              enum dma_data_direction dir,
                              dma_addr_t *dma_addr_out)
{
        struct page *page = virt_to_page(ptr);
        size_t offset = (uintptr_t)ptr & ~PAGE_MASK;

        return artpec6_crypto_dma_map_page(common, page, offset, size, dir,
                                          dma_addr_out);
}

static int
artpec6_crypto_dma_map_descs(struct artpec6_crypto_req_common *common)
{
        struct artpec6_crypto_dma_descriptors *dma = common->dma;
        int ret;

        ret = artpec6_crypto_dma_map_single(common, dma->in,
                                sizeof(dma->in[0]) * dma->in_cnt,
                                DMA_TO_DEVICE, &dma->in_dma_addr);
        if (ret)
                return ret;

        ret = artpec6_crypto_dma_map_single(common, dma->out,
                                sizeof(dma->out[0]) * dma->out_cnt,
                                DMA_TO_DEVICE, &dma->out_dma_addr);
        if (ret)
                return ret;

        /* We only read one stat descriptor */
        dma->stat[dma->in_cnt - 1] = 0;

        /*
         * DMA_BIDIRECTIONAL since we need our zeroing of the stat descriptor
         * to be written.
         */
        return artpec6_crypto_dma_map_single(common,
                                dma->stat,
                                sizeof(dma->stat[0]) * dma->in_cnt,
                                DMA_BIDIRECTIONAL,
                                &dma->stat_dma_addr);
}

static void
artpec6_crypto_dma_unmap_all(struct artpec6_crypto_req_common *common)
{
        struct artpec6_crypto_dma_descriptors *dma = common->dma;
        struct device *dev = artpec6_crypto_dev;
        int i;

        for (i = 0; i < dma->map_count; i++) {
                struct artpec6_crypto_dma_map *map = &dma->maps[i];

                dma_unmap_page(dev, map->dma_addr, map->size, map->dir);
        }

        dma->map_count = 0;
}

/** artpec6_crypto_setup_out_descr - Setup an out descriptor
 *
 * @dst: The virtual address of the data
 * @len: The length of the data
 * @eop: True if this is the last buffer in the packet
 * @use_short: If this is true and the data length is 7 bytes or less then
 *      a short descriptor will be used
 *
 * @return 0 on success
 *      Any errors from artpec6_crypto_setup_out_descr_short() or
 *      setup_out_descr_phys()
 */
static int
artpec6_crypto_setup_out_descr(struct artpec6_crypto_req_common *common,
                               void *dst, unsigned int len, bool eop,
                               bool use_short)
{
        if (use_short && len < 7) {
                return artpec6_crypto_setup_out_descr_short(common, dst, len,
                                                            eop);
        } else {
                int ret;
                dma_addr_t dma_addr;

                ret = artpec6_crypto_dma_map_single(common, dst, len,
                                                   DMA_TO_DEVICE,
                                                   &dma_addr);
                if (ret)
                        return ret;

                return artpec6_crypto_setup_out_descr_phys(common, dma_addr,
                                                           len, eop);
        }
}

/** artpec6_crypto_setup_in_descr_phys - Setup an in channel with a
 *                                       physical address
 *
 * @addr: The physical address of the data buffer
 * @len:  The length of the data buffer
 * @intr: True if an interrupt should be fired after HW processing of this
 *        descriptor
 *
 */
static int
artpec6_crypto_setup_in_descr_phys(struct artpec6_crypto_req_common *common,
                               dma_addr_t addr, unsigned int len, bool intr)
{
        struct artpec6_crypto_dma_descriptors *dma = common->dma;
        struct pdma_descr *d;

        if (dma->in_cnt >= PDMA_DESCR_COUNT ||
            fault_inject_dma_descr()) {
                pr_err("No free IN DMA descriptors available!\n");
                return -ENOSPC;
        }
        d = &dma->in[dma->in_cnt++];
        memset(d, 0, sizeof(*d));

        d->ctrl.intr = intr;
        d->data.len = len;
        d->data.buf = addr;
        return 0;
}

/** artpec6_crypto_setup_in_descr - Setup an in channel descriptor
 *
 * @buffer: The virtual address to of the data buffer
 * @len:    The length of the data buffer
 * @last:   If this is the last data buffer in the request (i.e. an interrupt
 *          is needed
 *
 * Short descriptors are not used for the in channel
 */
static int
artpec6_crypto_setup_in_descr(struct artpec6_crypto_req_common *common,
                          void *buffer, unsigned int len, bool last)
{
        dma_addr_t dma_addr;
        int ret;

        ret = artpec6_crypto_dma_map_single(common, buffer, len,
                                           DMA_FROM_DEVICE, &dma_addr);
        if (ret)
                return ret;

        return artpec6_crypto_setup_in_descr_phys(common, dma_addr, len, last);
}

static struct artpec6_crypto_bounce_buffer *
artpec6_crypto_alloc_bounce(gfp_t flags)
{
        void *base;
        size_t alloc_size = sizeof(struct artpec6_crypto_bounce_buffer) +
                            2 * ARTPEC_CACHE_LINE_MAX;
        struct artpec6_crypto_bounce_buffer *bbuf = kzalloc(alloc_size, flags);

        if (!bbuf)
                return NULL;

        base = bbuf + 1;
        bbuf->buf = PTR_ALIGN(base, ARTPEC_CACHE_LINE_MAX);
        return bbuf;
}

static int setup_bounce_buffer_in(struct artpec6_crypto_req_common *common,
                                  struct artpec6_crypto_walk *walk, size_t size)
{
        struct artpec6_crypto_bounce_buffer *bbuf;
        int ret;

        bbuf = artpec6_crypto_alloc_bounce(common->gfp_flags);
        if (!bbuf)
                return -ENOMEM;

        bbuf->length = size;
        bbuf->sg = walk->sg;
        bbuf->offset = walk->offset;

        ret =  artpec6_crypto_setup_in_descr(common, bbuf->buf, size, false);
        if (ret) {
                kfree(bbuf);
                return ret;
        }

        pr_debug("BOUNCE %zu offset %zu\n", size, walk->offset);
        list_add_tail(&bbuf->list, &common->dma->bounce_buffers);
        return 0;
}

static int
artpec6_crypto_setup_sg_descrs_in(struct artpec6_crypto_req_common *common,
                                  struct artpec6_crypto_walk *walk,
                                  size_t count)
{
        size_t chunk;
        int ret;
        dma_addr_t addr;

        while (walk->sg && count) {
                chunk = min(count, artpec6_crypto_walk_chunklen(walk));
                addr = artpec6_crypto_walk_chunk_phys(walk);

                /* When destination buffers are not aligned to the cache line
                 * size we need bounce buffers. The DMA-API requires that the
                 * entire line is owned by the DMA buffer and this holds also
                 * for the case when coherent DMA is used.
                 */
                if (!IS_ALIGNED(addr, ARTPEC_CACHE_LINE_MAX)) {
                        chunk = min_t(dma_addr_t, chunk,
                                      ALIGN(addr, ARTPEC_CACHE_LINE_MAX) -
                                      addr);

                        pr_debug("CHUNK-b %pad:%zu\n", &addr, chunk);
                        ret = setup_bounce_buffer_in(common, walk, chunk);
                } else if (chunk < ARTPEC_CACHE_LINE_MAX) {
                        pr_debug("CHUNK-b %pad:%zu\n", &addr, chunk);
                        ret = setup_bounce_buffer_in(common, walk, chunk);
                } else {
                        dma_addr_t dma_addr;

                        chunk = chunk & ~(ARTPEC_CACHE_LINE_MAX-1);

                        pr_debug("CHUNK %pad:%zu\n", &addr, chunk);

                        ret = artpec6_crypto_dma_map_page(common,
                                                         sg_page(walk->sg),
                                                         walk->sg->offset +
                                                         walk->offset,
                                                         chunk,
                                                         DMA_FROM_DEVICE,
                                                         &dma_addr);
                        if (ret)
                                return ret;

                        ret = artpec6_crypto_setup_in_descr_phys(common,
                                                                 dma_addr,
                                                                 chunk, false);
                }

                if (ret)
                        return ret;

                count = count - chunk;
                artpec6_crypto_walk_advance(walk, chunk);
        }

        if (count)
                pr_err("EOL unexpected %zu bytes left\n", count);

        return count ? -EINVAL : 0;
}

static int
artpec6_crypto_setup_sg_descrs_out(struct artpec6_crypto_req_common *common,
                                   struct artpec6_crypto_walk *walk,
                                   size_t count)
{
        size_t chunk;
        int ret;
        dma_addr_t addr;

        while (walk->sg && count) {
                chunk = min(count, artpec6_crypto_walk_chunklen(walk));
                addr = artpec6_crypto_walk_chunk_phys(walk);

                pr_debug("OUT-CHUNK %pad:%zu\n", &addr, chunk);

                if (addr & 3) {
                        char buf[3];

                        chunk = min_t(size_t, chunk, (4-(addr&3)));

                        sg_pcopy_to_buffer(walk->sg, 1, buf, chunk,
                                           walk->offset);

                        ret = artpec6_crypto_setup_out_descr_short(common, buf,
                                                                   chunk,
                                                                   false);
                } else {
                        dma_addr_t dma_addr;

                        ret = artpec6_crypto_dma_map_page(common,
                                                         sg_page(walk->sg),
                                                         walk->sg->offset +
                                                         walk->offset,
                                                         chunk,
                                                         DMA_TO_DEVICE,
                                                         &dma_addr);
                        if (ret)
                                return ret;

                        ret = artpec6_crypto_setup_out_descr_phys(common,
                                                                 dma_addr,
                                                                 chunk, false);
                }

                if (ret)
                        return ret;

                count = count - chunk;
                artpec6_crypto_walk_advance(walk, chunk);
        }

        if (count)
                pr_err("EOL unexpected %zu bytes left\n", count);

        return count ? -EINVAL : 0;
}


/** artpec6_crypto_terminate_out_descrs - Set the EOP on the last out descriptor
 *
 * If the out descriptor list is non-empty, then the eop flag on the
 * last used out descriptor will be set.
 *
 * @return  0 on success
 *      -EINVAL if the out descriptor is empty or has overflown
 */
static int
artpec6_crypto_terminate_out_descrs(struct artpec6_crypto_req_common *common)
{
        struct artpec6_crypto_dma_descriptors *dma = common->dma;
        struct pdma_descr *d;

        if (!dma->out_cnt || dma->out_cnt > PDMA_DESCR_COUNT) {
                pr_err("%s: OUT descriptor list is %s\n",
                        MODULE_NAME, dma->out_cnt ? "empty" : "full");
                return -EINVAL;

        }

        d = &dma->out[dma->out_cnt-1];
        d->ctrl.eop = 1;

        return 0;
}

/** artpec6_crypto_terminate_in_descrs - Set the interrupt flag on the last
 *                                       in descriptor
 *
 * See artpec6_crypto_terminate_out_descrs() for return values
 */
static int
artpec6_crypto_terminate_in_descrs(struct artpec6_crypto_req_common *common)
{
        struct artpec6_crypto_dma_descriptors *dma = common->dma;
        struct pdma_descr *d;

        if (!dma->in_cnt || dma->in_cnt > PDMA_DESCR_COUNT) {
                pr_err("%s: IN descriptor list is %s\n",
                        MODULE_NAME, dma->in_cnt ? "empty" : "full");
                return -EINVAL;
        }

        d = &dma->in[dma->in_cnt-1];
        d->ctrl.intr = 1;
        return 0;
}

/** create_hash_pad - Create a Secure Hash conformant pad
 *
 * @dst:      The destination buffer to write the pad. Must be at least 64 bytes
 * @dgstlen:  The total length of the hash digest in bytes
 * @bitcount: The total length of the digest in bits
 *
 * @return The total number of padding bytes written to @dst
 */
static size_t
create_hash_pad(int oper, unsigned char *dst, u64 dgstlen, u64 bitcount)

{
        unsigned int mod, target, diff, pad_bytes, size_bytes;
        __be64 bits = __cpu_to_be64(bitcount);

        switch (oper) {
        case regk_crypto_sha1:
        case regk_crypto_sha256:
        case regk_crypto_hmac_sha1:
        case regk_crypto_hmac_sha256:
                target = 448 / 8;
                mod = 512 / 8;
                size_bytes = 8;
                break;
        default:
                target = 896 / 8;
                mod = 1024 / 8;
                size_bytes = 16;
                break;
        }

        target -= 1;
        diff = dgstlen & (mod - 1);
        pad_bytes = diff > target ? target + mod - diff : target - diff;

        memset(dst + 1, 0, pad_bytes);
        dst[0] = 0x80;

        if (size_bytes == 16) {
                memset(dst + 1 + pad_bytes, 0, 8);
                memcpy(dst + 1 + pad_bytes + 8, &bits, 8);
        } else {
                memcpy(dst + 1 + pad_bytes, &bits, 8);
        }

        return pad_bytes + size_bytes + 1;
}

static int artpec6_crypto_common_init(struct artpec6_crypto_req_common *common,
                struct crypto_async_request *parent,
                void (*complete)(struct crypto_async_request *req),
                struct scatterlist *dstsg, unsigned int nbytes)
{
        gfp_t flags;
        struct artpec6_crypto *ac = dev_get_drvdata(artpec6_crypto_dev);

        flags = (parent->flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
                 GFP_KERNEL : GFP_ATOMIC;

        common->gfp_flags = flags;
        common->dma = kmem_cache_alloc(ac->dma_cache, flags);
        if (!common->dma)
                return -ENOMEM;

        common->req = parent;
        common->complete = complete;
        return 0;
}

static void
artpec6_crypto_bounce_destroy(struct artpec6_crypto_dma_descriptors *dma)
{
        struct artpec6_crypto_bounce_buffer *b;
        struct artpec6_crypto_bounce_buffer *next;

        list_for_each_entry_safe(b, next, &dma->bounce_buffers, list) {
                kfree(b);
        }
}

static int
artpec6_crypto_common_destroy(struct artpec6_crypto_req_common *common)
{
        struct artpec6_crypto *ac = dev_get_drvdata(artpec6_crypto_dev);

        artpec6_crypto_dma_unmap_all(common);
        artpec6_crypto_bounce_destroy(common->dma);
        kmem_cache_free(ac->dma_cache, common->dma);
        common->dma = NULL;
        return 0;
}

/*
 * Ciphering functions.
 */
static int artpec6_crypto_encrypt(struct skcipher_request *req)
{
        struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
        struct artpec6_cryptotfm_context *ctx = crypto_skcipher_ctx(cipher);
        struct artpec6_crypto_request_context *req_ctx = NULL;
        void (*complete)(struct crypto_async_request *req);
        int ret;

        req_ctx = skcipher_request_ctx(req);

        switch (ctx->crypto_type) {
        case ARTPEC6_CRYPTO_CIPHER_AES_CBC:
        case ARTPEC6_CRYPTO_CIPHER_AES_ECB:
        case ARTPEC6_CRYPTO_CIPHER_AES_XTS:
                req_ctx->decrypt = 0;
                break;
        default:
                break;
        }

        switch (ctx->crypto_type) {
        case ARTPEC6_CRYPTO_CIPHER_AES_CBC:
                complete = artpec6_crypto_complete_cbc_encrypt;
                break;
        default:
                complete = artpec6_crypto_complete_crypto;
                break;
        }

        ret = artpec6_crypto_common_init(&req_ctx->common,
                                  &req->base,
                                  complete,
                                  req->dst, req->cryptlen);
        if (ret)
                return ret;

        ret = artpec6_crypto_prepare_crypto(req);
        if (ret) {
                artpec6_crypto_common_destroy(&req_ctx->common);
                return ret;
        }

        return artpec6_crypto_submit(&req_ctx->common);
}

static int artpec6_crypto_decrypt(struct skcipher_request *req)
{
        int ret;
        struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
        struct artpec6_cryptotfm_context *ctx = crypto_skcipher_ctx(cipher);
        struct artpec6_crypto_request_context *req_ctx = NULL;
        void (*complete)(struct crypto_async_request *req);

        req_ctx = skcipher_request_ctx(req);

        switch (ctx->crypto_type) {
        case ARTPEC6_CRYPTO_CIPHER_AES_CBC:
        case ARTPEC6_CRYPTO_CIPHER_AES_ECB:
        case ARTPEC6_CRYPTO_CIPHER_AES_XTS:
                req_ctx->decrypt = 1;
                break;
        default:
                break;
        }


        switch (ctx->crypto_type) {
        case ARTPEC6_CRYPTO_CIPHER_AES_CBC:
                complete = artpec6_crypto_complete_cbc_decrypt;
                break;
        default:
                complete = artpec6_crypto_complete_crypto;
                break;
        }

        ret = artpec6_crypto_common_init(&req_ctx->common, &req->base,
                                  complete,
                                  req->dst, req->cryptlen);
        if (ret)
                return ret;

        ret = artpec6_crypto_prepare_crypto(req);
        if (ret) {
                artpec6_crypto_common_destroy(&req_ctx->common);
                return ret;
        }

        return artpec6_crypto_submit(&req_ctx->common);
}

static int
artpec6_crypto_ctr_crypt(struct skcipher_request *req, bool encrypt)
{
        struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
        struct artpec6_cryptotfm_context *ctx = crypto_skcipher_ctx(cipher);
        size_t iv_len = crypto_skcipher_ivsize(cipher);
        unsigned int counter = be32_to_cpup((__be32 *)
                                            (req->iv + iv_len - 4));
        unsigned int nblks = ALIGN(req->cryptlen, AES_BLOCK_SIZE) /
                             AES_BLOCK_SIZE;

        /*
         * The hardware uses only the last 32-bits as the counter while the
         * kernel tests (aes_ctr_enc_tv_template[4] for example) expect that
         * the whole IV is a counter.  So fallback if the counter is going to
         * overlow.
         */
        if (counter + nblks < counter) {
                int ret;

                pr_debug("counter %x will overflow (nblks %u), falling back\n",
                         counter, counter + nblks);

                ret = crypto_sync_skcipher_setkey(ctx->fallback, ctx->aes_key,
                                                  ctx->key_length);
                if (ret)
                        return ret;

                {
                        SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);

                        skcipher_request_set_sync_tfm(subreq, ctx->fallback);
                        skcipher_request_set_callback(subreq, req->base.flags,
                                                      NULL, NULL);
                        skcipher_request_set_crypt(subreq, req->src, req->dst,
                                                   req->cryptlen, req->iv);
                        ret = encrypt ? crypto_skcipher_encrypt(subreq)
                                      : crypto_skcipher_decrypt(subreq);
                        skcipher_request_zero(subreq);
                }
                return ret;
        }

        return encrypt ? artpec6_crypto_encrypt(req)
                       : artpec6_crypto_decrypt(req);
}

static int artpec6_crypto_ctr_encrypt(struct skcipher_request *req)
{
        return artpec6_crypto_ctr_crypt(req, true);
}

static int artpec6_crypto_ctr_decrypt(struct skcipher_request *req)
{
        return artpec6_crypto_ctr_crypt(req, false);
}

/*
 * AEAD functions
 */
static int artpec6_crypto_aead_init(struct crypto_aead *tfm)
{
        struct artpec6_cryptotfm_context *tfm_ctx = crypto_aead_ctx(tfm);

        memset(tfm_ctx, 0, sizeof(*tfm_ctx));

        crypto_aead_set_reqsize(tfm,
                                sizeof(struct artpec6_crypto_aead_req_ctx));

        return 0;
}

static int artpec6_crypto_aead_set_key(struct crypto_aead *tfm, const u8 *key,
                               unsigned int len)
{
        struct artpec6_cryptotfm_context *ctx = crypto_tfm_ctx(&tfm->base);

        if (len != 16 && len != 24 && len != 32)
                return -EINVAL;

        ctx->key_length = len;

        memcpy(ctx->aes_key, key, len);
        return 0;
}

static int artpec6_crypto_aead_encrypt(struct aead_request *req)
{
        int ret;
        struct artpec6_crypto_aead_req_ctx *req_ctx = aead_request_ctx(req);

        req_ctx->decrypt = false;
        ret = artpec6_crypto_common_init(&req_ctx->common, &req->base,
                                  artpec6_crypto_complete_aead,
                                  NULL, 0);
        if (ret)
                return ret;

        ret = artpec6_crypto_prepare_aead(req);
        if (ret) {
                artpec6_crypto_common_destroy(&req_ctx->common);
                return ret;
        }

        return artpec6_crypto_submit(&req_ctx->common);
}

static int artpec6_crypto_aead_decrypt(struct aead_request *req)
{
        int ret;
        struct artpec6_crypto_aead_req_ctx *req_ctx = aead_request_ctx(req);

        req_ctx->decrypt = true;
        if (req->cryptlen < AES_BLOCK_SIZE)
                return -EINVAL;

        ret = artpec6_crypto_common_init(&req_ctx->common,
                                  &req->base,
                                  artpec6_crypto_complete_aead,
                                  NULL, 0);
        if (ret)
                return ret;

        ret = artpec6_crypto_prepare_aead(req);
        if (ret) {
                artpec6_crypto_common_destroy(&req_ctx->common);
                return ret;
        }

        return artpec6_crypto_submit(&req_ctx->common);
}

static int artpec6_crypto_prepare_hash(struct ahash_request *areq)
{
        struct artpec6_hashalg_context *ctx = crypto_tfm_ctx(areq->base.tfm);
        struct artpec6_hash_request_context *req_ctx = ahash_request_ctx(areq);
        size_t digestsize = crypto_ahash_digestsize(crypto_ahash_reqtfm(areq));
        size_t contextsize = digestsize;
        size_t blocksize = crypto_tfm_alg_blocksize(
                crypto_ahash_tfm(crypto_ahash_reqtfm(areq)));
        struct artpec6_crypto_req_common *common = &req_ctx->common;
        struct artpec6_crypto *ac = dev_get_drvdata(artpec6_crypto_dev);
        enum artpec6_crypto_variant variant = ac->variant;
        u32 sel_ctx;
        bool ext_ctx = false;
        bool run_hw = false;
        int error = 0;

        artpec6_crypto_init_dma_operation(common);

        /* Upload HMAC key, must be first the first packet */
        if (req_ctx->hash_flags & HASH_FLAG_HMAC) {
                if (variant == ARTPEC6_CRYPTO) {
                        req_ctx->key_md = FIELD_PREP(A6_CRY_MD_OPER,
                                                     a6_regk_crypto_dlkey);
                } else {
                        req_ctx->key_md = FIELD_PREP(A7_CRY_MD_OPER,
                                                     a7_regk_crypto_dlkey);
                }

                /* Copy and pad up the key */
                memcpy(req_ctx->key_buffer, ctx->hmac_key,
                       ctx->hmac_key_length);
                memset(req_ctx->key_buffer + ctx->hmac_key_length, 0,
                       blocksize - ctx->hmac_key_length);

                error = artpec6_crypto_setup_out_descr(common,
                                        (void *)&req_ctx->key_md,
                                        sizeof(req_ctx->key_md), false, false);
                if (error)
                        return error;

                error = artpec6_crypto_setup_out_descr(common,
                                        req_ctx->key_buffer, blocksize,
                                        true, false);
                if (error)
                        return error;
        }

        if (!(req_ctx->hash_flags & HASH_FLAG_INIT_CTX)) {
                /* Restore context */
                sel_ctx = regk_crypto_ext;
                ext_ctx = true;
        } else {
                sel_ctx = regk_crypto_init;
        }

        if (variant == ARTPEC6_CRYPTO) {
                req_ctx->hash_md &= ~A6_CRY_MD_HASH_SEL_CTX;
                req_ctx->hash_md |= FIELD_PREP(A6_CRY_MD_HASH_SEL_CTX, sel_ctx);

                /* If this is the final round, set the final flag */
                if (req_ctx->hash_flags & HASH_FLAG_FINALIZE)
                        req_ctx->hash_md |= A6_CRY_MD_HASH_HMAC_FIN;
        } else {
                req_ctx->hash_md &= ~A7_CRY_MD_HASH_SEL_CTX;
                req_ctx->hash_md |= FIELD_PREP(A7_CRY_MD_HASH_SEL_CTX, sel_ctx);

                /* If this is the final round, set the final flag */
                if (req_ctx->hash_flags & HASH_FLAG_FINALIZE)
                        req_ctx->hash_md |= A7_CRY_MD_HASH_HMAC_FIN;
        }

        /* Setup up metadata descriptors */
        error = artpec6_crypto_setup_out_descr(common,
                                (void *)&req_ctx->hash_md,
                                sizeof(req_ctx->hash_md), false, false);
        if (error)
                return error;

        error = artpec6_crypto_setup_in_descr(common, ac->pad_buffer, 4, false);
        if (error)
                return error;

        if (ext_ctx) {
                error = artpec6_crypto_setup_out_descr(common,
                                        req_ctx->digeststate,
                                        contextsize, false, false);

                if (error)
                        return error;
        }

        if (req_ctx->hash_flags & HASH_FLAG_UPDATE) {
                size_t done_bytes = 0;
                size_t total_bytes = areq->nbytes + req_ctx->partial_bytes;
                size_t ready_bytes = round_down(total_bytes, blocksize);
                struct artpec6_crypto_walk walk;

                run_hw = ready_bytes > 0;
                if (req_ctx->partial_bytes && ready_bytes) {
                        /* We have a partial buffer and will at least some bytes
                         * to the HW. Empty this partial buffer before tackling
                         * the SG lists
                         */
                        memcpy(req_ctx->partial_buffer_out,
                                req_ctx->partial_buffer,
                                req_ctx->partial_bytes);

                        error = artpec6_crypto_setup_out_descr(common,
                                                req_ctx->partial_buffer_out,
                                                req_ctx->partial_bytes,
                                                false, true);
                        if (error)
                                return error;

                        /* Reset partial buffer */
                        done_bytes += req_ctx->partial_bytes;
                        req_ctx->partial_bytes = 0;
                }

                artpec6_crypto_walk_init(&walk, areq->src);

                error = artpec6_crypto_setup_sg_descrs_out(common, &walk,
                                                           ready_bytes -
                                                           done_bytes);
                if (error)
                        return error;

                if (walk.sg) {
                        size_t sg_skip = ready_bytes - done_bytes;
                        size_t sg_rem = areq->nbytes - sg_skip;

                        sg_pcopy_to_buffer(areq->src, sg_nents(areq->src),
                                           req_ctx->partial_buffer +
                                           req_ctx->partial_bytes,
                                           sg_rem, sg_skip);

                        req_ctx->partial_bytes += sg_rem;
                }

                req_ctx->digcnt += ready_bytes;
                req_ctx->hash_flags &= ~(HASH_FLAG_UPDATE);
        }

        /* Finalize */
        if (req_ctx->hash_flags & HASH_FLAG_FINALIZE) {
                size_t hash_pad_len;
                u64 digest_bits;
                u32 oper;

                if (variant == ARTPEC6_CRYPTO)
                        oper = FIELD_GET(A6_CRY_MD_OPER, req_ctx->hash_md);
                else
                        oper = FIELD_GET(A7_CRY_MD_OPER, req_ctx->hash_md);

                /* Write out the partial buffer if present */
                if (req_ctx->partial_bytes) {
                        memcpy(req_ctx->partial_buffer_out,
                               req_ctx->partial_buffer,
                               req_ctx->partial_bytes);
                        error = artpec6_crypto_setup_out_descr(common,
                                                req_ctx->partial_buffer_out,
                                                req_ctx->partial_bytes,
                                                false, true);
                        if (error)
                                return error;

                        req_ctx->digcnt += req_ctx->partial_bytes;
                        req_ctx->partial_bytes = 0;
                }

                if (req_ctx->hash_flags & HASH_FLAG_HMAC)
                        digest_bits = 8 * (req_ctx->digcnt + blocksize);
                else
                        digest_bits = 8 * req_ctx->digcnt;

                /* Add the hash pad */
                hash_pad_len = create_hash_pad(oper, req_ctx->pad_buffer,
                                               req_ctx->digcnt, digest_bits);
                error = artpec6_crypto_setup_out_descr(common,
                                                      req_ctx->pad_buffer,
                                                      hash_pad_len, false,
                                                      true);
                req_ctx->digcnt = 0;

                if (error)
                        return error;

                /* Descriptor for the final result */
                error = artpec6_crypto_setup_in_descr(common, areq->result,
                                                      digestsize,
                                                      true);
                if (error)
                        return error;

        } else { /* This is not the final operation for this request */
                if (!run_hw)
                        return ARTPEC6_CRYPTO_PREPARE_HASH_NO_START;

                /* Save the result to the context */
                error = artpec6_crypto_setup_in_descr(common,
                                                      req_ctx->digeststate,
                                                      contextsize, false);
                if (error)
                        return error;
                /* fall through */
        }

        req_ctx->hash_flags &= ~(HASH_FLAG_INIT_CTX | HASH_FLAG_UPDATE |
                                 HASH_FLAG_FINALIZE);

        error = artpec6_crypto_terminate_in_descrs(common);
        if (error)
                return error;

        error = artpec6_crypto_terminate_out_descrs(common);
        if (error)
                return error;

        error = artpec6_crypto_dma_map_descs(common);
        if (error)
                return error;

        return ARTPEC6_CRYPTO_PREPARE_HASH_START;
}


static int artpec6_crypto_aes_ecb_init(struct crypto_skcipher *tfm)
{
        struct artpec6_cryptotfm_context *ctx = crypto_skcipher_ctx(tfm);

        tfm->reqsize = sizeof(struct artpec6_crypto_request_context);
        ctx->crypto_type = ARTPEC6_CRYPTO_CIPHER_AES_ECB;

        return 0;
}

static int artpec6_crypto_aes_ctr_init(struct crypto_skcipher *tfm)
{
        struct artpec6_cryptotfm_context *ctx = crypto_skcipher_ctx(tfm);

        ctx->fallback =
                crypto_alloc_sync_skcipher(crypto_tfm_alg_name(&tfm->base),
                                           0, CRYPTO_ALG_NEED_FALLBACK);
        if (IS_ERR(ctx->fallback))
                return PTR_ERR(ctx->fallback);

        tfm->reqsize = sizeof(struct artpec6_crypto_request_context);
        ctx->crypto_type = ARTPEC6_CRYPTO_CIPHER_AES_CTR;

        return 0;
}

static int artpec6_crypto_aes_cbc_init(struct crypto_skcipher *tfm)
{
        struct artpec6_cryptotfm_context *ctx = crypto_skcipher_ctx(tfm);

        tfm->reqsize = sizeof(struct artpec6_crypto_request_context);
        ctx->crypto_type = ARTPEC6_CRYPTO_CIPHER_AES_CBC;

        return 0;
}

static int artpec6_crypto_aes_xts_init(struct crypto_skcipher *tfm)
{
        struct artpec6_cryptotfm_context *ctx = crypto_skcipher_ctx(tfm);

        tfm->reqsize = sizeof(struct artpec6_crypto_request_context);
        ctx->crypto_type = ARTPEC6_CRYPTO_CIPHER_AES_XTS;

        return 0;
}

static void artpec6_crypto_aes_exit(struct crypto_skcipher *tfm)
{
        struct artpec6_cryptotfm_context *ctx = crypto_skcipher_ctx(tfm);

        memset(ctx, 0, sizeof(*ctx));
}

static void artpec6_crypto_aes_ctr_exit(struct crypto_skcipher *tfm)
{
        struct artpec6_cryptotfm_context *ctx = crypto_skcipher_ctx(tfm);

        crypto_free_sync_skcipher(ctx->fallback);
        artpec6_crypto_aes_exit(tfm);
}

static int
artpec6_crypto_cipher_set_key(struct crypto_skcipher *cipher, const u8 *key,
                              unsigned int keylen)
{
        struct artpec6_cryptotfm_context *ctx =
                crypto_skcipher_ctx(cipher);

        switch (keylen) {
        case 16:
        case 24:
        case 32:
                break;
        default:
                return -EINVAL;
        }

        memcpy(ctx->aes_key, key, keylen);
        ctx->key_length = keylen;
        return 0;
}

static int
artpec6_crypto_xts_set_key(struct crypto_skcipher *cipher, const u8 *key,
                              unsigned int keylen)
{
        struct artpec6_cryptotfm_context *ctx =
                crypto_skcipher_ctx(cipher);
        int ret;

        ret = xts_check_key(&cipher->base, key, keylen);
        if (ret)
                return ret;

        switch (keylen) {
        case 32:
        case 48:
        case 64:
                break;
        default:
                return -EINVAL;
        }

        memcpy(ctx->aes_key, key, keylen);
        ctx->key_length = keylen;
        return 0;
}

/** artpec6_crypto_process_crypto - Prepare an async block cipher crypto request
 *
 * @req: The asynch request to process
 *
 * @return 0 if the dma job was successfully prepared
 *        <0 on error
 *
 * This function sets up the PDMA descriptors for a block cipher request.
 *
 * The required padding is added for AES-CTR using a statically defined
 * buffer.
 *
 * The PDMA descriptor list will be as follows:
 *
 * OUT: [KEY_MD][KEY][EOP]<CIPHER_MD>[IV]<data_0>...[data_n][AES-CTR_pad]<eop>
 * IN:  <CIPHER_MD><data_0>...[data_n]<intr>
 *
 */
static int artpec6_crypto_prepare_crypto(struct skcipher_request *areq)
{
        int ret;
        struct artpec6_crypto_walk walk;
        struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(areq);
        struct artpec6_cryptotfm_context *ctx = crypto_skcipher_ctx(cipher);
        struct artpec6_crypto_request_context *req_ctx = NULL;
        size_t iv_len = crypto_skcipher_ivsize(cipher);
        struct artpec6_crypto *ac = dev_get_drvdata(artpec6_crypto_dev);
        enum artpec6_crypto_variant variant = ac->variant;
        struct artpec6_crypto_req_common *common;
        bool cipher_decr = false;
        size_t cipher_klen;
        u32 cipher_len = 0; /* Same as regk_crypto_key_128 for NULL crypto */
        u32 oper;

        req_ctx = skcipher_request_ctx(areq);
        common = &req_ctx->common;

        artpec6_crypto_init_dma_operation(common);

        if (variant == ARTPEC6_CRYPTO)
                ctx->key_md = FIELD_PREP(A6_CRY_MD_OPER, a6_regk_crypto_dlkey);
        else
                ctx->key_md = FIELD_PREP(A7_CRY_MD_OPER, a7_regk_crypto_dlkey);

        ret = artpec6_crypto_setup_out_descr(common, (void *)&ctx->key_md,
                                             sizeof(ctx->key_md), false, false);
        if (ret)
                return ret;

        ret = artpec6_crypto_setup_out_descr(common, ctx->aes_key,
                                              ctx->key_length, true, false);
        if (ret)
                return ret;

        req_ctx->cipher_md = 0;

        if (ctx->crypto_type == ARTPEC6_CRYPTO_CIPHER_AES_XTS)
                cipher_klen = ctx->key_length/2;
        else
                cipher_klen =  ctx->key_length;

        /* Metadata */
        switch (cipher_klen) {
        case 16:
                cipher_len = regk_crypto_key_128;
                break;
        case 24:
                cipher_len = regk_crypto_key_192;
                break;
        case 32:
                cipher_len = regk_crypto_key_256;
                break;
        default:
                pr_err("%s: Invalid key length %d!\n",
                        MODULE_NAME, ctx->key_length);
                return -EINVAL;
        }

        switch (ctx->crypto_type) {
        case ARTPEC6_CRYPTO_CIPHER_AES_ECB:
                oper = regk_crypto_aes_ecb;
                cipher_decr = req_ctx->decrypt;
                break;

        case ARTPEC6_CRYPTO_CIPHER_AES_CBC:
                oper = regk_crypto_aes_cbc;
                cipher_decr = req_ctx->decrypt;
                break;

        case ARTPEC6_CRYPTO_CIPHER_AES_CTR:
                oper = regk_crypto_aes_ctr;
                cipher_decr = false;
                break;

        case ARTPEC6_CRYPTO_CIPHER_AES_XTS:
                oper = regk_crypto_aes_xts;
                cipher_decr = req_ctx->decrypt;

                if (variant == ARTPEC6_CRYPTO)
                        req_ctx->cipher_md |= A6_CRY_MD_CIPHER_DSEQ;
                else
                        req_ctx->cipher_md |= A7_CRY_MD_CIPHER_DSEQ;
                break;

        default:
                pr_err("%s: Invalid cipher mode %d!\n",
                        MODULE_NAME, ctx->crypto_type);
                return -EINVAL;
        }

        if (variant == ARTPEC6_CRYPTO) {
                req_ctx->cipher_md |= FIELD_PREP(A6_CRY_MD_OPER, oper);
                req_ctx->cipher_md |= FIELD_PREP(A6_CRY_MD_CIPHER_LEN,
                                                 cipher_len);
                if (cipher_decr)
                        req_ctx->cipher_md |= A6_CRY_MD_CIPHER_DECR;
        } else {
                req_ctx->cipher_md |= FIELD_PREP(A7_CRY_MD_OPER, oper);
                req_ctx->cipher_md |= FIELD_PREP(A7_CRY_MD_CIPHER_LEN,
                                                 cipher_len);
                if (cipher_decr)
                        req_ctx->cipher_md |= A7_CRY_MD_CIPHER_DECR;
        }

        ret = artpec6_crypto_setup_out_descr(common,
                                            &req_ctx->cipher_md,
                                            sizeof(req_ctx->cipher_md),
                                            false, false);
        if (ret)
                return ret;

        ret = artpec6_crypto_setup_in_descr(common, ac->pad_buffer, 4, false);
        if (ret)
                return ret;

        if (iv_len) {
                ret = artpec6_crypto_setup_out_descr(common, areq->iv, iv_len,
                                                     false, false);
                if (ret)
                        return ret;
        }
        /* Data out */
        artpec6_crypto_walk_init(&walk, areq->src);
        ret = artpec6_crypto_setup_sg_descrs_out(common, &walk, areq->cryptlen);
        if (ret)
                return ret;

        /* Data in */
        artpec6_crypto_walk_init(&walk, areq->dst);
        ret = artpec6_crypto_setup_sg_descrs_in(common, &walk, areq->cryptlen);
        if (ret)
                return ret;

        /* CTR-mode padding required by the HW. */
        if (ctx->crypto_type == ARTPEC6_CRYPTO_CIPHER_AES_CTR ||
            ctx->crypto_type == ARTPEC6_CRYPTO_CIPHER_AES_XTS) {
                size_t pad = ALIGN(areq->cryptlen, AES_BLOCK_SIZE) -
                             areq->cryptlen;

                if (pad) {
                        ret = artpec6_crypto_setup_out_descr(common,
                                                             ac->pad_buffer,
                                                             pad, false, false);
                        if (ret)
                                return ret;

                        ret = artpec6_crypto_setup_in_descr(common,
                                                            ac->pad_buffer, pad,
                                                            false);
                        if (ret)
                                return ret;
                }
        }

        ret = artpec6_crypto_terminate_out_descrs(common);
        if (ret)
                return ret;

        ret = artpec6_crypto_terminate_in_descrs(common);
        if (ret)
                return ret;

        return artpec6_crypto_dma_map_descs(common);
}

static int artpec6_crypto_prepare_aead(struct aead_request *areq)
{
        size_t count;
        int ret;
        size_t input_length;
        struct artpec6_cryptotfm_context *ctx = crypto_tfm_ctx(areq->base.tfm);
        struct artpec6_crypto_aead_req_ctx *req_ctx = aead_request_ctx(areq);
        struct crypto_aead *cipher = crypto_aead_reqtfm(areq);
        struct artpec6_crypto_req_common *common = &req_ctx->common;
        struct artpec6_crypto *ac = dev_get_drvdata(artpec6_crypto_dev);
        enum artpec6_crypto_variant variant = ac->variant;
        u32 md_cipher_len;

        artpec6_crypto_init_dma_operation(common);

        /* Key */
        if (variant == ARTPEC6_CRYPTO) {
                ctx->key_md = FIELD_PREP(A6_CRY_MD_OPER,
                                         a6_regk_crypto_dlkey);
        } else {
                ctx->key_md = FIELD_PREP(A7_CRY_MD_OPER,
                                         a7_regk_crypto_dlkey);
        }
        ret = artpec6_crypto_setup_out_descr(common, (void *)&ctx->key_md,
                                             sizeof(ctx->key_md), false, false);
        if (ret)
                return ret;

        ret = artpec6_crypto_setup_out_descr(common, ctx->aes_key,
                                             ctx->key_length, true, false);
        if (ret)
                return ret;

        req_ctx->cipher_md = 0;

        switch (ctx->key_length) {
        case 16:
                md_cipher_len = regk_crypto_key_128;
                break;
        case 24:
                md_cipher_len = regk_crypto_key_192;
                break;
        case 32:
                md_cipher_len = regk_crypto_key_256;
                break;
        default:
                return -EINVAL;
        }

        if (variant == ARTPEC6_CRYPTO) {
                req_ctx->cipher_md |= FIELD_PREP(A6_CRY_MD_OPER,
                                                 regk_crypto_aes_gcm);
                req_ctx->cipher_md |= FIELD_PREP(A6_CRY_MD_CIPHER_LEN,
                                                 md_cipher_len);
                if (req_ctx->decrypt)
                        req_ctx->cipher_md |= A6_CRY_MD_CIPHER_DECR;
        } else {
                req_ctx->cipher_md |= FIELD_PREP(A7_CRY_MD_OPER,
                                                 regk_crypto_aes_gcm);
                req_ctx->cipher_md |= FIELD_PREP(A7_CRY_MD_CIPHER_LEN,
                                                 md_cipher_len);
                if (req_ctx->decrypt)
                        req_ctx->cipher_md |= A7_CRY_MD_CIPHER_DECR;
        }

        ret = artpec6_crypto_setup_out_descr(common,
                                            (void *) &req_ctx->cipher_md,
                                            sizeof(req_ctx->cipher_md), false,
                                            false);
        if (ret)
                return ret;

        ret = artpec6_crypto_setup_in_descr(common, ac->pad_buffer, 4, false);
        if (ret)
                return ret;

        /* For the decryption, cryptlen includes the tag. */
        input_length = areq->cryptlen;
        if (req_ctx->decrypt)
                input_length -= crypto_aead_authsize(cipher);

        /* Prepare the context buffer */
        req_ctx->hw_ctx.aad_length_bits =
                __cpu_to_be64(8*areq->assoclen);

        req_ctx->hw_ctx.text_length_bits =
                __cpu_to_be64(8*input_length);

        memcpy(req_ctx->hw_ctx.J0, areq->iv, crypto_aead_ivsize(cipher));
        // The HW omits the initial increment of the counter field.
        memcpy(req_ctx->hw_ctx.J0 + GCM_AES_IV_SIZE, "\x00\x00\x00\x01", 4);

        ret = artpec6_crypto_setup_out_descr(common, &req_ctx->hw_ctx,
                sizeof(struct artpec6_crypto_aead_hw_ctx), false, false);
        if (ret)
                return ret;

        {
                struct artpec6_crypto_walk walk;

                artpec6_crypto_walk_init(&walk, areq->src);

                /* Associated data */
                count = areq->assoclen;
                ret = artpec6_crypto_setup_sg_descrs_out(common, &walk, count);
                if (ret)
                        return ret;

                if (!IS_ALIGNED(areq->assoclen, 16)) {
                        size_t assoc_pad = 16 - (areq->assoclen % 16);
                        /* The HW mandates zero padding here */
                        ret = artpec6_crypto_setup_out_descr(common,
                                                             ac->zero_buffer,
                                                             assoc_pad, false,
                                                             false);
                        if (ret)
                                return ret;
                }

                /* Data to crypto */
                count = input_length;
                ret = artpec6_crypto_setup_sg_descrs_out(common, &walk, count);
                if (ret)
                        return ret;

                if (!IS_ALIGNED(input_length, 16)) {
                        size_t crypto_pad = 16 - (input_length % 16);
                        /* The HW mandates zero padding here */
                        ret = artpec6_crypto_setup_out_descr(common,
                                                             ac->zero_buffer,
                                                             crypto_pad,
                                                             false,
                                                             false);
                        if (ret)
                                return ret;
                }
        }

        /* Data from crypto */
        {
                struct artpec6_crypto_walk walk;
                size_t output_len = areq->cryptlen;

                if (req_ctx->decrypt)
                        output_len -= crypto_aead_authsize(cipher);

                artpec6_crypto_walk_init(&walk, areq->dst);

                /* skip associated data in the output */
                count = artpec6_crypto_walk_advance(&walk, areq->assoclen);
                if (count)
                        return -EINVAL;

                count = output_len;
                ret = artpec6_crypto_setup_sg_descrs_in(common, &walk, count);
                if (ret)
                        return ret;

                /* Put padding between the cryptotext and the auth tag */
                if (!IS_ALIGNED(output_len, 16)) {
                        size_t crypto_pad = 16 - (output_len % 16);

                        ret = artpec6_crypto_setup_in_descr(common,
                                                            ac->pad_buffer,
                                                            crypto_pad, false);
                        if (ret)
                                return ret;
                }

                /* The authentication tag shall follow immediately after
                 * the output ciphertext. For decryption it is put in a context
                 * buffer for later compare against the input tag.
                 */

                if (req_ctx->decrypt) {

                        ret = artpec6_crypto_setup_in_descr(common,
                                req_ctx->decryption_tag, AES_BLOCK_SIZE, false);
                        if (ret)
                                return ret;

                } else {
                        /* For encryption the requested tag size may be smaller
                         * than the hardware's generated tag.
                         */
                        size_t authsize = crypto_aead_authsize(cipher);

                        ret = artpec6_crypto_setup_sg_descrs_in(common, &walk,
                                                                authsize);
                        if (ret)
                                return ret;

                        if (authsize < AES_BLOCK_SIZE) {
                                count = AES_BLOCK_SIZE - authsize;
                                ret = artpec6_crypto_setup_in_descr(common,
                                        ac->pad_buffer,
                                        count, false);
                                if (ret)
                                        return ret;
                        }
                }

        }

        ret = artpec6_crypto_terminate_in_descrs(common);
        if (ret)
                return ret;

        ret = artpec6_crypto_terminate_out_descrs(common);
        if (ret)
                return ret;

        return artpec6_crypto_dma_map_descs(common);
}

static void artpec6_crypto_process_queue(struct artpec6_crypto *ac,
            struct list_head *completions)
{
        struct artpec6_crypto_req_common *req;

        while (!list_empty(&ac->queue) && !artpec6_crypto_busy()) {
                req = list_first_entry(&ac->queue,
                                       struct artpec6_crypto_req_common,
                                       list);
                list_move_tail(&req->list, &ac->pending);
                artpec6_crypto_start_dma(req);

                list_add_tail(&req->complete_in_progress, completions);
        }

        /*
         * In some cases, the hardware can raise an in_eop_flush interrupt
         * before actually updating the status, so we have an timer which will
         * recheck the status on timeout.  Since the cases are expected to be
         * very rare, we use a relatively large timeout value.  There should be
         * no noticeable negative effect if we timeout spuriously.
         */
        if (ac->pending_count)
                mod_timer(&ac->timer, jiffies + msecs_to_jiffies(100));
        else
                del_timer(&ac->timer);
}

static void artpec6_crypto_timeout(struct timer_list *t)
{
        struct artpec6_crypto *ac = from_timer(ac, t, timer);

        dev_info_ratelimited(artpec6_crypto_dev, "timeout\n");

        tasklet_schedule(&ac->task);
}

static void artpec6_crypto_task(unsigned long data)
{
        struct artpec6_crypto *ac = (struct artpec6_crypto *)data;
        struct artpec6_crypto_req_common *req;
        struct artpec6_crypto_req_common *n;
        struct list_head complete_done;
        struct list_head complete_in_progress;

        INIT_LIST_HEAD(&complete_done);
        INIT_LIST_HEAD(&complete_in_progress);

        if (list_empty(&ac->pending)) {
                pr_debug("Spurious IRQ\n");
                return;
        }

        spin_lock_bh(&ac->queue_lock);

        list_for_each_entry_safe(req, n, &ac->pending, list) {
                struct artpec6_crypto_dma_descriptors *dma = req->dma;
                u32 stat;
                dma_addr_t stataddr;

                stataddr = dma->stat_dma_addr + 4 * (req->dma->in_cnt - 1);
                dma_sync_single_for_cpu(artpec6_crypto_dev,
                                        stataddr,
                                        4,
                                        DMA_BIDIRECTIONAL);

                stat = req->dma->stat[req->dma->in_cnt-1];

                /* A non-zero final status descriptor indicates
                 * this job has finished.
                 */
                pr_debug("Request %p status is %X\n", req, stat);
                if (!stat)
                        break;

                /* Allow testing of timeout handling with fault injection */
#ifdef CONFIG_FAULT_INJECTION
                if (should_fail(&artpec6_crypto_fail_status_read, 1))
                        continue;
#endif

                pr_debug("Completing request %p\n", req);

                list_move_tail(&req->list, &complete_done);

                ac->pending_count--;
        }

        artpec6_crypto_process_queue(ac, &complete_in_progress);

        spin_unlock_bh(&ac->queue_lock);

        /* Perform the completion callbacks without holding the queue lock
         * to allow new request submissions from the callbacks.
         */
        list_for_each_entry_safe(req, n, &complete_done, list) {
                artpec6_crypto_dma_unmap_all(req);
                artpec6_crypto_copy_bounce_buffers(req);
                artpec6_crypto_common_destroy(req);

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

        list_for_each_entry_safe(req, n, &complete_in_progress,
                                 complete_in_progress) {
                req->req->complete(req->req, -EINPROGRESS);
        }
}

static void artpec6_crypto_complete_crypto(struct crypto_async_request *req)
{
        req->complete(req, 0);
}

static void
artpec6_crypto_complete_cbc_decrypt(struct crypto_async_request *req)
{
        struct skcipher_request *cipher_req = container_of(req,
                struct skcipher_request, base);

        scatterwalk_map_and_copy(cipher_req->iv, cipher_req->src,
                                 cipher_req->cryptlen - AES_BLOCK_SIZE,
                                 AES_BLOCK_SIZE, 0);
        req->complete(req, 0);
}

static void
artpec6_crypto_complete_cbc_encrypt(struct crypto_async_request *req)
{
        struct skcipher_request *cipher_req = container_of(req,
                struct skcipher_request, base);

        scatterwalk_map_and_copy(cipher_req->iv, cipher_req->dst,
                                 cipher_req->cryptlen - AES_BLOCK_SIZE,
                                 AES_BLOCK_SIZE, 0);
        req->complete(req, 0);
}

static void artpec6_crypto_complete_aead(struct crypto_async_request *req)
{
        int result = 0;

        /* Verify GCM hashtag. */
        struct aead_request *areq = container_of(req,
                struct aead_request, base);
        struct crypto_aead *aead = crypto_aead_reqtfm(areq);
        struct artpec6_crypto_aead_req_ctx *req_ctx = aead_request_ctx(areq);

        if (req_ctx->decrypt) {
                u8 input_tag[AES_BLOCK_SIZE];
                unsigned int authsize = crypto_aead_authsize(aead);

                sg_pcopy_to_buffer(areq->src,
                                   sg_nents(areq->src),
                                   input_tag,
                                   authsize,
                                   areq->assoclen + areq->cryptlen -
                                   authsize);

                if (crypto_memneq(req_ctx->decryption_tag,
                                  input_tag,
                                  authsize)) {
                        pr_debug("***EBADMSG:\n");
                        print_hex_dump_debug("ref:", DUMP_PREFIX_ADDRESS, 32, 1,
                                             input_tag, authsize, true);
                        print_hex_dump_debug("out:", DUMP_PREFIX_ADDRESS, 32, 1,
                                             req_ctx->decryption_tag,
                                             authsize, true);

                        result = -EBADMSG;
                }
        }

        req->complete(req, result);
}

static void artpec6_crypto_complete_hash(struct crypto_async_request *req)
{
        req->complete(req, 0);
}


/*------------------- Hash functions -----------------------------------------*/
static int
artpec6_crypto_hash_set_key(struct crypto_ahash *tfm,
                    const u8 *key, unsigned int keylen)
{
        struct artpec6_hashalg_context *tfm_ctx = crypto_tfm_ctx(&tfm->base);
        size_t blocksize;
        int ret;

        if (!keylen) {
                pr_err("Invalid length (%d) of HMAC key\n",
                        keylen);
                return -EINVAL;
        }

        memset(tfm_ctx->hmac_key, 0, sizeof(tfm_ctx->hmac_key));

        blocksize = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));

        if (keylen > blocksize) {
                tfm_ctx->hmac_key_length = blocksize;

                ret = crypto_shash_tfm_digest(tfm_ctx->child_hash, key, keylen,
                                              tfm_ctx->hmac_key);
                if (ret)
                        return ret;
        } else {
                memcpy(tfm_ctx->hmac_key, key, keylen);
                tfm_ctx->hmac_key_length = keylen;
        }

        return 0;
}

static int
artpec6_crypto_init_hash(struct ahash_request *req, u8 type, int hmac)
{
        struct artpec6_crypto *ac = dev_get_drvdata(artpec6_crypto_dev);
        enum artpec6_crypto_variant variant = ac->variant;
        struct artpec6_hash_request_context *req_ctx = ahash_request_ctx(req);
        u32 oper;

        memset(req_ctx, 0, sizeof(*req_ctx));

        req_ctx->hash_flags = HASH_FLAG_INIT_CTX;
        if (hmac)
                req_ctx->hash_flags |= (HASH_FLAG_HMAC | HASH_FLAG_UPDATE_KEY);

        switch (type) {
        case ARTPEC6_CRYPTO_HASH_SHA1:
                oper = hmac ? regk_crypto_hmac_sha1 : regk_crypto_sha1;
                break;
        case ARTPEC6_CRYPTO_HASH_SHA256:
                oper = hmac ? regk_crypto_hmac_sha256 : regk_crypto_sha256;
                break;
        default:
                pr_err("%s: Unsupported hash type 0x%x\n", MODULE_NAME, type);
                return -EINVAL;
        }

        if (variant == ARTPEC6_CRYPTO)
                req_ctx->hash_md = FIELD_PREP(A6_CRY_MD_OPER, oper);
        else
                req_ctx->hash_md = FIELD_PREP(A7_CRY_MD_OPER, oper);

        return 0;
}

static int artpec6_crypto_prepare_submit_hash(struct ahash_request *req)
{
        struct artpec6_hash_request_context *req_ctx = ahash_request_ctx(req);
        int ret;

        if (!req_ctx->common.dma) {
                ret = artpec6_crypto_common_init(&req_ctx->common,
                                          &req->base,
                                          artpec6_crypto_complete_hash,
                                          NULL, 0);

                if (ret)
                        return ret;
        }

        ret = artpec6_crypto_prepare_hash(req);
        switch (ret) {
        case ARTPEC6_CRYPTO_PREPARE_HASH_START:
                ret = artpec6_crypto_submit(&req_ctx->common);
                break;

        case ARTPEC6_CRYPTO_PREPARE_HASH_NO_START:
                ret = 0;
                fallthrough;

        default:
                artpec6_crypto_common_destroy(&req_ctx->common);
                break;
        }

        return ret;
}

static int artpec6_crypto_hash_final(struct ahash_request *req)
{
        struct artpec6_hash_request_context *req_ctx = ahash_request_ctx(req);

        req_ctx->hash_flags |= HASH_FLAG_FINALIZE;

        return artpec6_crypto_prepare_submit_hash(req);
}

static int artpec6_crypto_hash_update(struct ahash_request *req)
{
        struct artpec6_hash_request_context *req_ctx = ahash_request_ctx(req);

        req_ctx->hash_flags |= HASH_FLAG_UPDATE;

        return artpec6_crypto_prepare_submit_hash(req);
}

static int artpec6_crypto_sha1_init(struct ahash_request *req)
{
        return artpec6_crypto_init_hash(req, ARTPEC6_CRYPTO_HASH_SHA1, 0);
}

static int artpec6_crypto_sha1_digest(struct ahash_request *req)
{
        struct artpec6_hash_request_context *req_ctx = ahash_request_ctx(req);

        artpec6_crypto_init_hash(req, ARTPEC6_CRYPTO_HASH_SHA1, 0);

        req_ctx->hash_flags |= HASH_FLAG_UPDATE | HASH_FLAG_FINALIZE;

        return artpec6_crypto_prepare_submit_hash(req);
}

static int artpec6_crypto_sha256_init(struct ahash_request *req)
{
        return artpec6_crypto_init_hash(req, ARTPEC6_CRYPTO_HASH_SHA256, 0);
}

static int artpec6_crypto_sha256_digest(struct ahash_request *req)
{
        struct artpec6_hash_request_context *req_ctx = ahash_request_ctx(req);

        artpec6_crypto_init_hash(req, ARTPEC6_CRYPTO_HASH_SHA256, 0);
        req_ctx->hash_flags |= HASH_FLAG_UPDATE | HASH_FLAG_FINALIZE;

        return artpec6_crypto_prepare_submit_hash(req);
}

static int artpec6_crypto_hmac_sha256_init(struct ahash_request *req)
{
        return artpec6_crypto_init_hash(req, ARTPEC6_CRYPTO_HASH_SHA256, 1);
}

static int artpec6_crypto_hmac_sha256_digest(struct ahash_request *req)
{
        struct artpec6_hash_request_context *req_ctx = ahash_request_ctx(req);

        artpec6_crypto_init_hash(req, ARTPEC6_CRYPTO_HASH_SHA256, 1);
        req_ctx->hash_flags |= HASH_FLAG_UPDATE | HASH_FLAG_FINALIZE;

        return artpec6_crypto_prepare_submit_hash(req);
}

static int artpec6_crypto_ahash_init_common(struct crypto_tfm *tfm,
                                    const char *base_hash_name)
{
        struct artpec6_hashalg_context *tfm_ctx = crypto_tfm_ctx(tfm);

        crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
                                 sizeof(struct artpec6_hash_request_context));
        memset(tfm_ctx, 0, sizeof(*tfm_ctx));

        if (base_hash_name) {
                struct crypto_shash *child;

                child = crypto_alloc_shash(base_hash_name, 0,
                                           CRYPTO_ALG_NEED_FALLBACK);

                if (IS_ERR(child))
                        return PTR_ERR(child);

                tfm_ctx->child_hash = child;
        }

        return 0;
}

static int artpec6_crypto_ahash_init(struct crypto_tfm *tfm)
{
        return artpec6_crypto_ahash_init_common(tfm, NULL);
}

static int artpec6_crypto_ahash_init_hmac_sha256(struct crypto_tfm *tfm)
{
        return artpec6_crypto_ahash_init_common(tfm, "sha256");
}

static void artpec6_crypto_ahash_exit(struct crypto_tfm *tfm)
{
        struct artpec6_hashalg_context *tfm_ctx = crypto_tfm_ctx(tfm);

        if (tfm_ctx->child_hash)
                crypto_free_shash(tfm_ctx->child_hash);

        memset(tfm_ctx->hmac_key, 0, sizeof(tfm_ctx->hmac_key));
        tfm_ctx->hmac_key_length = 0;
}

static int artpec6_crypto_hash_export(struct ahash_request *req, void *out)
{
        const struct artpec6_hash_request_context *ctx = ahash_request_ctx(req);
        struct artpec6_hash_export_state *state = out;
        struct artpec6_crypto *ac = dev_get_drvdata(artpec6_crypto_dev);
        enum artpec6_crypto_variant variant = ac->variant;

        BUILD_BUG_ON(sizeof(state->partial_buffer) !=
                     sizeof(ctx->partial_buffer));
        BUILD_BUG_ON(sizeof(state->digeststate) != sizeof(ctx->digeststate));

        state->digcnt = ctx->digcnt;
        state->partial_bytes = ctx->partial_bytes;
        state->hash_flags = ctx->hash_flags;

        if (variant == ARTPEC6_CRYPTO)
                state->oper = FIELD_GET(A6_CRY_MD_OPER, ctx->hash_md);
        else
                state->oper = FIELD_GET(A7_CRY_MD_OPER, ctx->hash_md);

        memcpy(state->partial_buffer, ctx->partial_buffer,
               sizeof(state->partial_buffer));
        memcpy(state->digeststate, ctx->digeststate,
               sizeof(state->digeststate));

        return 0;
}

static int artpec6_crypto_hash_import(struct ahash_request *req, const void *in)
{
        struct artpec6_hash_request_context *ctx = ahash_request_ctx(req);
        const struct artpec6_hash_export_state *state = in;
        struct artpec6_crypto *ac = dev_get_drvdata(artpec6_crypto_dev);
        enum artpec6_crypto_variant variant = ac->variant;

        memset(ctx, 0, sizeof(*ctx));

        ctx->digcnt = state->digcnt;
        ctx->partial_bytes = state->partial_bytes;
        ctx->hash_flags = state->hash_flags;

        if (variant == ARTPEC6_CRYPTO)
                ctx->hash_md = FIELD_PREP(A6_CRY_MD_OPER, state->oper);
        else
                ctx->hash_md = FIELD_PREP(A7_CRY_MD_OPER, state->oper);

        memcpy(ctx->partial_buffer, state->partial_buffer,
               sizeof(state->partial_buffer));
        memcpy(ctx->digeststate, state->digeststate,
               sizeof(state->digeststate));

        return 0;
}

static int init_crypto_hw(struct artpec6_crypto *ac)
{
        enum artpec6_crypto_variant variant = ac->variant;
        void __iomem *base = ac->base;
        u32 out_descr_buf_size;
        u32 out_data_buf_size;
        u32 in_data_buf_size;
        u32 in_descr_buf_size;
        u32 in_stat_buf_size;
        u32 in, out;

        /*
         * The PDMA unit contains 1984 bytes of internal memory for the OUT
         * channels and 1024 bytes for the IN channel. This is an elastic
         * memory used to internally store the descriptors and data. The values
         * ares specified in 64 byte incremements.  Trustzone buffers are not
         * used at this stage.
         */
        out_data_buf_size = 16;  /* 1024 bytes for data */
        out_descr_buf_size = 15; /* 960 bytes for descriptors */
        in_data_buf_size = 8;    /* 512 bytes for data */
        in_descr_buf_size = 4;   /* 256 bytes for descriptors */
        in_stat_buf_size = 4;   /* 256 bytes for stat descrs */

        BUILD_BUG_ON_MSG((out_data_buf_size
                                + out_descr_buf_size) * 64 > 1984,
                          "Invalid OUT configuration");

        BUILD_BUG_ON_MSG((in_data_buf_size
                                + in_descr_buf_size
                                + in_stat_buf_size) * 64 > 1024,
                          "Invalid IN configuration");

        in = FIELD_PREP(PDMA_IN_BUF_CFG_DATA_BUF_SIZE, in_data_buf_size) |
             FIELD_PREP(PDMA_IN_BUF_CFG_DESCR_BUF_SIZE, in_descr_buf_size) |
             FIELD_PREP(PDMA_IN_BUF_CFG_STAT_BUF_SIZE, in_stat_buf_size);

        out = FIELD_PREP(PDMA_OUT_BUF_CFG_DATA_BUF_SIZE, out_data_buf_size) |
              FIELD_PREP(PDMA_OUT_BUF_CFG_DESCR_BUF_SIZE, out_descr_buf_size);

        writel_relaxed(out, base + PDMA_OUT_BUF_CFG);
        writel_relaxed(PDMA_OUT_CFG_EN, base + PDMA_OUT_CFG);

        if (variant == ARTPEC6_CRYPTO) {
                writel_relaxed(in, base + A6_PDMA_IN_BUF_CFG);
                writel_relaxed(PDMA_IN_CFG_EN, base + A6_PDMA_IN_CFG);
                writel_relaxed(A6_PDMA_INTR_MASK_IN_DATA |
                               A6_PDMA_INTR_MASK_IN_EOP_FLUSH,
                               base + A6_PDMA_INTR_MASK);
        } else {
                writel_relaxed(in, base + A7_PDMA_IN_BUF_CFG);
                writel_relaxed(PDMA_IN_CFG_EN, base + A7_PDMA_IN_CFG);
                writel_relaxed(A7_PDMA_INTR_MASK_IN_DATA |
                               A7_PDMA_INTR_MASK_IN_EOP_FLUSH,
                               base + A7_PDMA_INTR_MASK);
        }

        return 0;
}

static void artpec6_crypto_disable_hw(struct artpec6_crypto *ac)
{
        enum artpec6_crypto_variant variant = ac->variant;
        void __iomem *base = ac->base;

        if (variant == ARTPEC6_CRYPTO) {
                writel_relaxed(A6_PDMA_IN_CMD_STOP, base + A6_PDMA_IN_CMD);
                writel_relaxed(0, base + A6_PDMA_IN_CFG);
                writel_relaxed(A6_PDMA_OUT_CMD_STOP, base + PDMA_OUT_CMD);
        } else {
                writel_relaxed(A7_PDMA_IN_CMD_STOP, base + A7_PDMA_IN_CMD);
                writel_relaxed(0, base + A7_PDMA_IN_CFG);
                writel_relaxed(A7_PDMA_OUT_CMD_STOP, base + PDMA_OUT_CMD);
        }

        writel_relaxed(0, base + PDMA_OUT_CFG);

}

static irqreturn_t artpec6_crypto_irq(int irq, void *dev_id)
{
        struct artpec6_crypto *ac = dev_id;
        enum artpec6_crypto_variant variant = ac->variant;
        void __iomem *base = ac->base;
        u32 mask_in_data, mask_in_eop_flush;
        u32 in_cmd_flush_stat, in_cmd_reg;
        u32 ack_intr_reg;
        u32 ack = 0;
        u32 intr;

        if (variant == ARTPEC6_CRYPTO) {
                intr = readl_relaxed(base + A6_PDMA_MASKED_INTR);
                mask_in_data = A6_PDMA_INTR_MASK_IN_DATA;
                mask_in_eop_flush = A6_PDMA_INTR_MASK_IN_EOP_FLUSH;
                in_cmd_flush_stat = A6_PDMA_IN_CMD_FLUSH_STAT;
                in_cmd_reg = A6_PDMA_IN_CMD;
                ack_intr_reg = A6_PDMA_ACK_INTR;
        } else {
                intr = readl_relaxed(base + A7_PDMA_MASKED_INTR);
                mask_in_data = A7_PDMA_INTR_MASK_IN_DATA;
                mask_in_eop_flush = A7_PDMA_INTR_MASK_IN_EOP_FLUSH;
                in_cmd_flush_stat = A7_PDMA_IN_CMD_FLUSH_STAT;
                in_cmd_reg = A7_PDMA_IN_CMD;
                ack_intr_reg = A7_PDMA_ACK_INTR;
        }

        /* We get two interrupt notifications from each job.
         * The in_data means all data was sent to memory and then
         * we request a status flush command to write the per-job
         * status to its status vector. This ensures that the
         * tasklet can detect exactly how many submitted jobs
         * that have finished.
         */
        if (intr & mask_in_data)
                ack |= mask_in_data;

        if (intr & mask_in_eop_flush)
                ack |= mask_in_eop_flush;
        else
                writel_relaxed(in_cmd_flush_stat, base + in_cmd_reg);

        writel_relaxed(ack, base + ack_intr_reg);

        if (intr & mask_in_eop_flush)
                tasklet_schedule(&ac->task);

        return IRQ_HANDLED;
}

/*------------------- Algorithm definitions ----------------------------------*/

/* Hashes */
static struct ahash_alg hash_algos[] = {
        /* SHA-1 */
        {
                .init = artpec6_crypto_sha1_init,
                .update = artpec6_crypto_hash_update,
                .final = artpec6_crypto_hash_final,
                .digest = artpec6_crypto_sha1_digest,
                .import = artpec6_crypto_hash_import,
                .export = artpec6_crypto_hash_export,
                .halg.digestsize = SHA1_DIGEST_SIZE,
                .halg.statesize = sizeof(struct artpec6_hash_export_state),
                .halg.base = {
                        .cra_name = "sha1",
                        .cra_driver_name = "artpec-sha1",
                        .cra_priority = 300,
                        .cra_flags = CRYPTO_ALG_ASYNC |
                                     CRYPTO_ALG_ALLOCATES_MEMORY,
                        .cra_blocksize = SHA1_BLOCK_SIZE,
                        .cra_ctxsize = sizeof(struct artpec6_hashalg_context),
                        .cra_alignmask = 3,
                        .cra_module = THIS_MODULE,
                        .cra_init = artpec6_crypto_ahash_init,
                        .cra_exit = artpec6_crypto_ahash_exit,
                }
        },
        /* SHA-256 */
        {
                .init = artpec6_crypto_sha256_init,
                .update = artpec6_crypto_hash_update,
                .final = artpec6_crypto_hash_final,
                .digest = artpec6_crypto_sha256_digest,
                .import = artpec6_crypto_hash_import,
                .export = artpec6_crypto_hash_export,
                .halg.digestsize = SHA256_DIGEST_SIZE,
                .halg.statesize = sizeof(struct artpec6_hash_export_state),
                .halg.base = {
                        .cra_name = "sha256",
                        .cra_driver_name = "artpec-sha256",
                        .cra_priority = 300,
                        .cra_flags = CRYPTO_ALG_ASYNC |
                                     CRYPTO_ALG_ALLOCATES_MEMORY,
                        .cra_blocksize = SHA256_BLOCK_SIZE,
                        .cra_ctxsize = sizeof(struct artpec6_hashalg_context),
                        .cra_alignmask = 3,
                        .cra_module = THIS_MODULE,
                        .cra_init = artpec6_crypto_ahash_init,
                        .cra_exit = artpec6_crypto_ahash_exit,
                }
        },
        /* HMAC SHA-256 */
        {
                .init = artpec6_crypto_hmac_sha256_init,
                .update = artpec6_crypto_hash_update,
                .final = artpec6_crypto_hash_final,
                .digest = artpec6_crypto_hmac_sha256_digest,
                .import = artpec6_crypto_hash_import,
                .export = artpec6_crypto_hash_export,
                .setkey = artpec6_crypto_hash_set_key,
                .halg.digestsize = SHA256_DIGEST_SIZE,
                .halg.statesize = sizeof(struct artpec6_hash_export_state),
                .halg.base = {
                        .cra_name = "hmac(sha256)",
                        .cra_driver_name = "artpec-hmac-sha256",
                        .cra_priority = 300,
                        .cra_flags = CRYPTO_ALG_ASYNC |
                                     CRYPTO_ALG_ALLOCATES_MEMORY,
                        .cra_blocksize = SHA256_BLOCK_SIZE,
                        .cra_ctxsize = sizeof(struct artpec6_hashalg_context),
                        .cra_alignmask = 3,
                        .cra_module = THIS_MODULE,
                        .cra_init = artpec6_crypto_ahash_init_hmac_sha256,
                        .cra_exit = artpec6_crypto_ahash_exit,
                }
        },
};

/* Crypto */
static struct skcipher_alg crypto_algos[] = {
        /* AES - ECB */
        {
                .base = {
                        .cra_name = "ecb(aes)",
                        .cra_driver_name = "artpec6-ecb-aes",
                        .cra_priority = 300,
                        .cra_flags = CRYPTO_ALG_ASYNC |
                                     CRYPTO_ALG_ALLOCATES_MEMORY,
                        .cra_blocksize = AES_BLOCK_SIZE,
                        .cra_ctxsize = sizeof(struct artpec6_cryptotfm_context),
                        .cra_alignmask = 3,
                        .cra_module = THIS_MODULE,
                },
                .min_keysize = AES_MIN_KEY_SIZE,
                .max_keysize = AES_MAX_KEY_SIZE,
                .setkey = artpec6_crypto_cipher_set_key,
                .encrypt = artpec6_crypto_encrypt,
                .decrypt = artpec6_crypto_decrypt,
                .init = artpec6_crypto_aes_ecb_init,
                .exit = artpec6_crypto_aes_exit,
        },
        /* AES - CTR */
        {
                .base = {
                        .cra_name = "ctr(aes)",
                        .cra_driver_name = "artpec6-ctr-aes",
                        .cra_priority = 300,
                        .cra_flags = CRYPTO_ALG_ASYNC |
                                     CRYPTO_ALG_ALLOCATES_MEMORY |
                                     CRYPTO_ALG_NEED_FALLBACK,
                        .cra_blocksize = 1,
                        .cra_ctxsize = sizeof(struct artpec6_cryptotfm_context),
                        .cra_alignmask = 3,
                        .cra_module = THIS_MODULE,
                },
                .min_keysize = AES_MIN_KEY_SIZE,
                .max_keysize = AES_MAX_KEY_SIZE,
                .ivsize = AES_BLOCK_SIZE,
                .setkey = artpec6_crypto_cipher_set_key,
                .encrypt = artpec6_crypto_ctr_encrypt,
                .decrypt = artpec6_crypto_ctr_decrypt,
                .init = artpec6_crypto_aes_ctr_init,
                .exit = artpec6_crypto_aes_ctr_exit,
        },
        /* AES - CBC */
        {
                .base = {
                        .cra_name = "cbc(aes)",
                        .cra_driver_name = "artpec6-cbc-aes",
                        .cra_priority = 300,
                        .cra_flags = CRYPTO_ALG_ASYNC |
                                     CRYPTO_ALG_ALLOCATES_MEMORY,
                        .cra_blocksize = AES_BLOCK_SIZE,
                        .cra_ctxsize = sizeof(struct artpec6_cryptotfm_context),
                        .cra_alignmask = 3,
                        .cra_module = THIS_MODULE,
                },
                .min_keysize = AES_MIN_KEY_SIZE,
                .max_keysize = AES_MAX_KEY_SIZE,
                .ivsize = AES_BLOCK_SIZE,
                .setkey = artpec6_crypto_cipher_set_key,
                .encrypt = artpec6_crypto_encrypt,
                .decrypt = artpec6_crypto_decrypt,
                .init = artpec6_crypto_aes_cbc_init,
                .exit = artpec6_crypto_aes_exit
        },
        /* AES - XTS */
        {
                .base = {
                        .cra_name = "xts(aes)",
                        .cra_driver_name = "artpec6-xts-aes",
                        .cra_priority = 300,
                        .cra_flags = CRYPTO_ALG_ASYNC |
                                     CRYPTO_ALG_ALLOCATES_MEMORY,
                        .cra_blocksize = 1,
                        .cra_ctxsize = sizeof(struct artpec6_cryptotfm_context),
                        .cra_alignmask = 3,
                        .cra_module = THIS_MODULE,
                },
                .min_keysize = 2*AES_MIN_KEY_SIZE,
                .max_keysize = 2*AES_MAX_KEY_SIZE,
                .ivsize = 16,
                .setkey = artpec6_crypto_xts_set_key,
                .encrypt = artpec6_crypto_encrypt,
                .decrypt = artpec6_crypto_decrypt,
                .init = artpec6_crypto_aes_xts_init,
                .exit = artpec6_crypto_aes_exit,
        },
};

static struct aead_alg aead_algos[] = {
        {
                .init   = artpec6_crypto_aead_init,
                .setkey = artpec6_crypto_aead_set_key,
                .encrypt = artpec6_crypto_aead_encrypt,
                .decrypt = artpec6_crypto_aead_decrypt,
                .ivsize = GCM_AES_IV_SIZE,
                .maxauthsize = AES_BLOCK_SIZE,

                .base = {
                        .cra_name = "gcm(aes)",
                        .cra_driver_name = "artpec-gcm-aes",
                        .cra_priority = 300,
                        .cra_flags = CRYPTO_ALG_ASYNC |
                                     CRYPTO_ALG_ALLOCATES_MEMORY |
                                     CRYPTO_ALG_KERN_DRIVER_ONLY,
                        .cra_blocksize = 1,
                        .cra_ctxsize = sizeof(struct artpec6_cryptotfm_context),
                        .cra_alignmask = 3,
                        .cra_module = THIS_MODULE,
                },
        }
};

#ifdef CONFIG_DEBUG_FS

struct dbgfs_u32 {
        char *name;
        mode_t mode;
        u32 *flag;
        char *desc;
};

static struct dentry *dbgfs_root;

static void artpec6_crypto_init_debugfs(void)
{
        dbgfs_root = debugfs_create_dir("artpec6_crypto", NULL);

#ifdef CONFIG_FAULT_INJECTION
        fault_create_debugfs_attr("fail_status_read", dbgfs_root,
                                  &artpec6_crypto_fail_status_read);

        fault_create_debugfs_attr("fail_dma_array_full", dbgfs_root,
                                  &artpec6_crypto_fail_dma_array_full);
#endif
}

static void artpec6_crypto_free_debugfs(void)
{
        debugfs_remove_recursive(dbgfs_root);
        dbgfs_root = NULL;
}
#endif

static const struct of_device_id artpec6_crypto_of_match[] = {
        { .compatible = "axis,artpec6-crypto", .data = (void *)ARTPEC6_CRYPTO },
        { .compatible = "axis,artpec7-crypto", .data = (void *)ARTPEC7_CRYPTO },
        {}
};
MODULE_DEVICE_TABLE(of, artpec6_crypto_of_match);

static int artpec6_crypto_probe(struct platform_device *pdev)
{
        const struct of_device_id *match;
        enum artpec6_crypto_variant variant;
        struct artpec6_crypto *ac;
        struct device *dev = &pdev->dev;
        void __iomem *base;
        int irq;
        int err;

        if (artpec6_crypto_dev)
                return -ENODEV;

        match = of_match_node(artpec6_crypto_of_match, dev->of_node);
        if (!match)
                return -EINVAL;

        variant = (enum artpec6_crypto_variant)match->data;

        base = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(base))
                return PTR_ERR(base);

        irq = platform_get_irq(pdev, 0);
        if (irq < 0)
                return -ENODEV;

        ac = devm_kzalloc(&pdev->dev, sizeof(struct artpec6_crypto),
                          GFP_KERNEL);
        if (!ac)
                return -ENOMEM;

        platform_set_drvdata(pdev, ac);
        ac->variant = variant;

        spin_lock_init(&ac->queue_lock);
        INIT_LIST_HEAD(&ac->queue);
        INIT_LIST_HEAD(&ac->pending);
        timer_setup(&ac->timer, artpec6_crypto_timeout, 0);

        ac->base = base;

        ac->dma_cache = kmem_cache_create("artpec6_crypto_dma",
                sizeof(struct artpec6_crypto_dma_descriptors),
                64,
                0,
                NULL);
        if (!ac->dma_cache)
                return -ENOMEM;

#ifdef CONFIG_DEBUG_FS
        artpec6_crypto_init_debugfs();
#endif

        tasklet_init(&ac->task, artpec6_crypto_task,
                     (unsigned long)ac);

        ac->pad_buffer = devm_kzalloc(&pdev->dev, 2 * ARTPEC_CACHE_LINE_MAX,
                                      GFP_KERNEL);
        if (!ac->pad_buffer)
                return -ENOMEM;
        ac->pad_buffer = PTR_ALIGN(ac->pad_buffer, ARTPEC_CACHE_LINE_MAX);

        ac->zero_buffer = devm_kzalloc(&pdev->dev, 2 * ARTPEC_CACHE_LINE_MAX,
                                      GFP_KERNEL);
        if (!ac->zero_buffer)
                return -ENOMEM;
        ac->zero_buffer = PTR_ALIGN(ac->zero_buffer, ARTPEC_CACHE_LINE_MAX);

        err = init_crypto_hw(ac);
        if (err)
                goto free_cache;

        err = devm_request_irq(&pdev->dev, irq, artpec6_crypto_irq, 0,
                               "artpec6-crypto", ac);
        if (err)
                goto disable_hw;

        artpec6_crypto_dev = &pdev->dev;

        err = crypto_register_ahashes(hash_algos, ARRAY_SIZE(hash_algos));
        if (err) {
                dev_err(dev, "Failed to register ahashes\n");
                goto disable_hw;
        }

        err = crypto_register_skciphers(crypto_algos, ARRAY_SIZE(crypto_algos));
        if (err) {
                dev_err(dev, "Failed to register ciphers\n");
                goto unregister_ahashes;
        }

        err = crypto_register_aeads(aead_algos, ARRAY_SIZE(aead_algos));
        if (err) {
                dev_err(dev, "Failed to register aeads\n");
                goto unregister_algs;
        }

        return 0;

unregister_algs:
        crypto_unregister_skciphers(crypto_algos, ARRAY_SIZE(crypto_algos));
unregister_ahashes:
        crypto_unregister_ahashes(hash_algos, ARRAY_SIZE(hash_algos));
disable_hw:
        artpec6_crypto_disable_hw(ac);
free_cache:
        kmem_cache_destroy(ac->dma_cache);
        return err;
}

static int artpec6_crypto_remove(struct platform_device *pdev)
{
        struct artpec6_crypto *ac = platform_get_drvdata(pdev);
        int irq = platform_get_irq(pdev, 0);

        crypto_unregister_ahashes(hash_algos, ARRAY_SIZE(hash_algos));
        crypto_unregister_skciphers(crypto_algos, ARRAY_SIZE(crypto_algos));
        crypto_unregister_aeads(aead_algos, ARRAY_SIZE(aead_algos));

        tasklet_disable(&ac->task);
        devm_free_irq(&pdev->dev, irq, ac);
        tasklet_kill(&ac->task);
        del_timer_sync(&ac->timer);

        artpec6_crypto_disable_hw(ac);

        kmem_cache_destroy(ac->dma_cache);
#ifdef CONFIG_DEBUG_FS
        artpec6_crypto_free_debugfs();
#endif
        return 0;
}

static struct platform_driver artpec6_crypto_driver = {
        .probe   = artpec6_crypto_probe,
        .remove  = artpec6_crypto_remove,
        .driver  = {
                .name  = "artpec6-crypto",
                .of_match_table = artpec6_crypto_of_match,
        },
};

module_platform_driver(artpec6_crypto_driver);

MODULE_AUTHOR("Axis Communications AB");
MODULE_DESCRIPTION("ARTPEC-6 Crypto driver");
MODULE_LICENSE("GPL");