/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __MARVELL_CESA_H__
#define __MARVELL_CESA_H__

#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>

#include <linux/dma-direction.h>
#include <linux/dmapool.h>

#define CESA_ENGINE_OFF(i)                      (((i) * 0x2000))

#define CESA_TDMA_BYTE_CNT                      0x800
#define CESA_TDMA_SRC_ADDR                      0x810
#define CESA_TDMA_DST_ADDR                      0x820
#define CESA_TDMA_NEXT_ADDR                     0x830

#define CESA_TDMA_CONTROL                       0x840
#define CESA_TDMA_DST_BURST                     GENMASK(2, 0)
#define CESA_TDMA_DST_BURST_32B                 3
#define CESA_TDMA_DST_BURST_128B                4
#define CESA_TDMA_OUT_RD_EN                     BIT(4)
#define CESA_TDMA_SRC_BURST                     GENMASK(8, 6)
#define CESA_TDMA_SRC_BURST_32B                 (3 << 6)
#define CESA_TDMA_SRC_BURST_128B                (4 << 6)
#define CESA_TDMA_CHAIN                         BIT(9)
#define CESA_TDMA_BYTE_SWAP                     BIT(11)
#define CESA_TDMA_NO_BYTE_SWAP                  BIT(11)
#define CESA_TDMA_EN                            BIT(12)
#define CESA_TDMA_FETCH_ND                      BIT(13)
#define CESA_TDMA_ACT                           BIT(14)

#define CESA_TDMA_CUR                           0x870
#define CESA_TDMA_ERROR_CAUSE                   0x8c8
#define CESA_TDMA_ERROR_MSK                     0x8cc

#define CESA_TDMA_WINDOW_BASE(x)                (((x) * 0x8) + 0xa00)
#define CESA_TDMA_WINDOW_CTRL(x)                (((x) * 0x8) + 0xa04)

#define CESA_IVDIG(x)                           (0xdd00 + ((x) * 4) +   \
                                                 (((x) < 5) ? 0 : 0x14))

#define CESA_SA_CMD                             0xde00
#define CESA_SA_CMD_EN_CESA_SA_ACCL0            BIT(0)
#define CESA_SA_CMD_EN_CESA_SA_ACCL1            BIT(1)
#define CESA_SA_CMD_DISABLE_SEC                 BIT(2)

#define CESA_SA_DESC_P0                         0xde04

#define CESA_SA_DESC_P1                         0xde14

#define CESA_SA_CFG                             0xde08
#define CESA_SA_CFG_STOP_DIG_ERR                GENMASK(1, 0)
#define CESA_SA_CFG_DIG_ERR_CONT                0
#define CESA_SA_CFG_DIG_ERR_SKIP                1
#define CESA_SA_CFG_DIG_ERR_STOP                3
#define CESA_SA_CFG_CH0_W_IDMA                  BIT(7)
#define CESA_SA_CFG_CH1_W_IDMA                  BIT(8)
#define CESA_SA_CFG_ACT_CH0_IDMA                BIT(9)
#define CESA_SA_CFG_ACT_CH1_IDMA                BIT(10)
#define CESA_SA_CFG_MULTI_PKT                   BIT(11)
#define CESA_SA_CFG_PARA_DIS                    BIT(13)

#define CESA_SA_ACCEL_STATUS                    0xde0c
#define CESA_SA_ST_ACT_0                        BIT(0)
#define CESA_SA_ST_ACT_1                        BIT(1)

/*
 * CESA_SA_FPGA_INT_STATUS looks like an FPGA leftover and is documented only
 * in Errata 4.12. It looks like that it was part of an IRQ-controller in FPGA
 * and someone forgot to remove  it while switching to the core and moving to
 * CESA_SA_INT_STATUS.
 */
#define CESA_SA_FPGA_INT_STATUS                 0xdd68
#define CESA_SA_INT_STATUS                      0xde20
#define CESA_SA_INT_AUTH_DONE                   BIT(0)
#define CESA_SA_INT_DES_E_DONE                  BIT(1)
#define CESA_SA_INT_AES_E_DONE                  BIT(2)
#define CESA_SA_INT_AES_D_DONE                  BIT(3)
#define CESA_SA_INT_ENC_DONE                    BIT(4)
#define CESA_SA_INT_ACCEL0_DONE                 BIT(5)
#define CESA_SA_INT_ACCEL1_DONE                 BIT(6)
#define CESA_SA_INT_ACC0_IDMA_DONE              BIT(7)
#define CESA_SA_INT_ACC1_IDMA_DONE              BIT(8)
#define CESA_SA_INT_IDMA_DONE                   BIT(9)
#define CESA_SA_INT_IDMA_OWN_ERR                BIT(10)

#define CESA_SA_INT_MSK                         0xde24

#define CESA_SA_DESC_CFG_OP_MAC_ONLY            0
#define CESA_SA_DESC_CFG_OP_CRYPT_ONLY          1
#define CESA_SA_DESC_CFG_OP_MAC_CRYPT           2
#define CESA_SA_DESC_CFG_OP_CRYPT_MAC           3
#define CESA_SA_DESC_CFG_OP_MSK                 GENMASK(1, 0)
#define CESA_SA_DESC_CFG_MACM_SHA256            (1 << 4)
#define CESA_SA_DESC_CFG_MACM_HMAC_SHA256       (3 << 4)
#define CESA_SA_DESC_CFG_MACM_MD5               (4 << 4)
#define CESA_SA_DESC_CFG_MACM_SHA1              (5 << 4)
#define CESA_SA_DESC_CFG_MACM_HMAC_MD5          (6 << 4)
#define CESA_SA_DESC_CFG_MACM_HMAC_SHA1         (7 << 4)
#define CESA_SA_DESC_CFG_MACM_MSK               GENMASK(6, 4)
#define CESA_SA_DESC_CFG_CRYPTM_DES             (1 << 8)
#define CESA_SA_DESC_CFG_CRYPTM_3DES            (2 << 8)
#define CESA_SA_DESC_CFG_CRYPTM_AES             (3 << 8)
#define CESA_SA_DESC_CFG_CRYPTM_MSK             GENMASK(9, 8)
#define CESA_SA_DESC_CFG_DIR_ENC                (0 << 12)
#define CESA_SA_DESC_CFG_DIR_DEC                (1 << 12)
#define CESA_SA_DESC_CFG_CRYPTCM_ECB            (0 << 16)
#define CESA_SA_DESC_CFG_CRYPTCM_CBC            (1 << 16)
#define CESA_SA_DESC_CFG_CRYPTCM_MSK            BIT(16)
#define CESA_SA_DESC_CFG_3DES_EEE               (0 << 20)
#define CESA_SA_DESC_CFG_3DES_EDE               (1 << 20)
#define CESA_SA_DESC_CFG_AES_LEN_128            (0 << 24)
#define CESA_SA_DESC_CFG_AES_LEN_192            (1 << 24)
#define CESA_SA_DESC_CFG_AES_LEN_256            (2 << 24)
#define CESA_SA_DESC_CFG_AES_LEN_MSK            GENMASK(25, 24)
#define CESA_SA_DESC_CFG_NOT_FRAG               (0 << 30)
#define CESA_SA_DESC_CFG_FIRST_FRAG             (1 << 30)
#define CESA_SA_DESC_CFG_LAST_FRAG              (2 << 30)
#define CESA_SA_DESC_CFG_MID_FRAG               (3 << 30)
#define CESA_SA_DESC_CFG_FRAG_MSK               GENMASK(31, 30)

/*
 * /-----------\ 0
 * | ACCEL CFG |        4 * 8
 * |-----------| 0x20
 * | CRYPT KEY |        8 * 4
 * |-----------| 0x40
 * |  IV   IN  |        4 * 4
 * |-----------| 0x40 (inplace)
 * |  IV BUF   |        4 * 4
 * |-----------| 0x80
 * |  DATA IN  |        16 * x (max ->max_req_size)
 * |-----------| 0x80 (inplace operation)
 * |  DATA OUT |        16 * x (max ->max_req_size)
 * \-----------/ SRAM size
 */

/*
 * Hashing memory map:
 * /-----------\ 0
 * | ACCEL CFG |        4 * 8
 * |-----------| 0x20
 * | Inner IV  |        8 * 4
 * |-----------| 0x40
 * | Outer IV  |        8 * 4
 * |-----------| 0x60
 * | Output BUF|        8 * 4
 * |-----------| 0x80
 * |  DATA IN  |        64 * x (max ->max_req_size)
 * \-----------/ SRAM size
 */

#define CESA_SA_CFG_SRAM_OFFSET                 0x00
#define CESA_SA_DATA_SRAM_OFFSET                0x80

#define CESA_SA_CRYPT_KEY_SRAM_OFFSET           0x20
#define CESA_SA_CRYPT_IV_SRAM_OFFSET            0x40

#define CESA_SA_MAC_IIV_SRAM_OFFSET             0x20
#define CESA_SA_MAC_OIV_SRAM_OFFSET             0x40
#define CESA_SA_MAC_DIG_SRAM_OFFSET             0x60

#define CESA_SA_DESC_CRYPT_DATA(offset)                                 \
        cpu_to_le32((CESA_SA_DATA_SRAM_OFFSET + (offset)) |             \
                    ((CESA_SA_DATA_SRAM_OFFSET + (offset)) << 16))

#define CESA_SA_DESC_CRYPT_IV(offset)                                   \
        cpu_to_le32((CESA_SA_CRYPT_IV_SRAM_OFFSET + (offset)) | \
                    ((CESA_SA_CRYPT_IV_SRAM_OFFSET + (offset)) << 16))

#define CESA_SA_DESC_CRYPT_KEY(offset)                                  \
        cpu_to_le32(CESA_SA_CRYPT_KEY_SRAM_OFFSET + (offset))

#define CESA_SA_DESC_MAC_DATA(offset)                                   \
        cpu_to_le32(CESA_SA_DATA_SRAM_OFFSET + (offset))
#define CESA_SA_DESC_MAC_DATA_MSK               cpu_to_le32(GENMASK(15, 0))

#define CESA_SA_DESC_MAC_TOTAL_LEN(total_len)   cpu_to_le32((total_len) << 16)
#define CESA_SA_DESC_MAC_TOTAL_LEN_MSK          cpu_to_le32(GENMASK(31, 16))

#define CESA_SA_DESC_MAC_SRC_TOTAL_LEN_MAX      0xffff

#define CESA_SA_DESC_MAC_DIGEST(offset)                                 \
        cpu_to_le32(CESA_SA_MAC_DIG_SRAM_OFFSET + (offset))
#define CESA_SA_DESC_MAC_DIGEST_MSK             cpu_to_le32(GENMASK(15, 0))

#define CESA_SA_DESC_MAC_FRAG_LEN(frag_len)     cpu_to_le32((frag_len) << 16)
#define CESA_SA_DESC_MAC_FRAG_LEN_MSK           cpu_to_le32(GENMASK(31, 16))

#define CESA_SA_DESC_MAC_IV(offset)                                     \
        cpu_to_le32((CESA_SA_MAC_IIV_SRAM_OFFSET + (offset)) |          \
                    ((CESA_SA_MAC_OIV_SRAM_OFFSET + (offset)) << 16))

#define CESA_SA_SRAM_SIZE                       2048
#define CESA_SA_SRAM_PAYLOAD_SIZE               (cesa_dev->sram_size - \
                                                 CESA_SA_DATA_SRAM_OFFSET)

#define CESA_SA_DEFAULT_SRAM_SIZE               2048
#define CESA_SA_MIN_SRAM_SIZE                   1024

#define CESA_SA_SRAM_MSK                        (2048 - 1)

#define CESA_MAX_HASH_BLOCK_SIZE                64
#define CESA_HASH_BLOCK_SIZE_MSK                (CESA_MAX_HASH_BLOCK_SIZE - 1)

/**
 * struct mv_cesa_sec_accel_desc - security accelerator descriptor
 * @config:     engine config
 * @enc_p:      input and output data pointers for a cipher operation
 * @enc_len:    cipher operation length
 * @enc_key_p:  cipher key pointer
 * @enc_iv:     cipher IV pointers
 * @mac_src_p:  input pointer and total hash length
 * @mac_digest: digest pointer and hash operation length
 * @mac_iv:     hmac IV pointers
 *
 * Structure passed to the CESA engine to describe the crypto operation
 * to be executed.
 */
struct mv_cesa_sec_accel_desc {
        __le32 config;
        __le32 enc_p;
        __le32 enc_len;
        __le32 enc_key_p;
        __le32 enc_iv;
        __le32 mac_src_p;
        __le32 mac_digest;
        __le32 mac_iv;
};

/**
 * struct mv_cesa_skcipher_op_ctx - cipher operation context
 * @key:        cipher key
 * @iv:         cipher IV
 *
 * Context associated to a cipher operation.
 */
struct mv_cesa_skcipher_op_ctx {
        __le32 key[8];
        u32 iv[4];
};

/**
 * struct mv_cesa_hash_op_ctx - hash or hmac operation context
 * @key:        cipher key
 * @iv:         cipher IV
 *
 * Context associated to an hash or hmac operation.
 */
struct mv_cesa_hash_op_ctx {
        u32 iv[16];
        __le32 hash[8];
};

/**
 * struct mv_cesa_op_ctx - crypto operation context
 * @desc:       CESA descriptor
 * @ctx:        context associated to the crypto operation
 *
 * Context associated to a crypto operation.
 */
struct mv_cesa_op_ctx {
        struct mv_cesa_sec_accel_desc desc;
        union {
                struct mv_cesa_skcipher_op_ctx skcipher;
                struct mv_cesa_hash_op_ctx hash;
        } ctx;
};

/* TDMA descriptor flags */
#define CESA_TDMA_DST_IN_SRAM                   BIT(31)
#define CESA_TDMA_SRC_IN_SRAM                   BIT(30)
#define CESA_TDMA_END_OF_REQ                    BIT(29)
#define CESA_TDMA_BREAK_CHAIN                   BIT(28)
#define CESA_TDMA_SET_STATE                     BIT(27)
#define CESA_TDMA_TYPE_MSK                      GENMASK(26, 0)
#define CESA_TDMA_DUMMY                         0
#define CESA_TDMA_DATA                          1
#define CESA_TDMA_OP                            2
#define CESA_TDMA_RESULT                        3

/**
 * struct mv_cesa_tdma_desc - TDMA descriptor
 * @byte_cnt:   number of bytes to transfer
 * @src:        DMA address of the source
 * @dst:        DMA address of the destination
 * @next_dma:   DMA address of the next TDMA descriptor
 * @cur_dma:    DMA address of this TDMA descriptor
 * @next:       pointer to the next TDMA descriptor
 * @op:         CESA operation attached to this TDMA descriptor
 * @data:       raw data attached to this TDMA descriptor
 * @flags:      flags describing the TDMA transfer. See the
 *              "TDMA descriptor flags" section above
 *
 * TDMA descriptor used to create a transfer chain describing a crypto
 * operation.
 */
struct mv_cesa_tdma_desc {
        __le32 byte_cnt;
        union {
                __le32 src;
                u32 src_dma;
        };
        union {
                __le32 dst;
                u32 dst_dma;
        };
        __le32 next_dma;

        /* Software state */
        dma_addr_t cur_dma;
        struct mv_cesa_tdma_desc *next;
        union {
                struct mv_cesa_op_ctx *op;
                void *data;
        };
        u32 flags;
};

/**
 * struct mv_cesa_sg_dma_iter - scatter-gather iterator
 * @dir:        transfer direction
 * @sg:         scatter list
 * @offset:     current position in the scatter list
 * @op_offset:  current position in the crypto operation
 *
 * Iterator used to iterate over a scatterlist while creating a TDMA chain for
 * a crypto operation.
 */
struct mv_cesa_sg_dma_iter {
        enum dma_data_direction dir;
        struct scatterlist *sg;
        unsigned int offset;
        unsigned int op_offset;
};

/**
 * struct mv_cesa_dma_iter - crypto operation iterator
 * @len:        the crypto operation length
 * @offset:     current position in the crypto operation
 * @op_len:     sub-operation length (the crypto engine can only act on 2kb
 *              chunks)
 *
 * Iterator used to create a TDMA chain for a given crypto operation.
 */
struct mv_cesa_dma_iter {
        unsigned int len;
        unsigned int offset;
        unsigned int op_len;
};

/**
 * struct mv_cesa_tdma_chain - TDMA chain
 * @first:      first entry in the TDMA chain
 * @last:       last entry in the TDMA chain
 *
 * Stores a TDMA chain for a specific crypto operation.
 */
struct mv_cesa_tdma_chain {
        struct mv_cesa_tdma_desc *first;
        struct mv_cesa_tdma_desc *last;
};

struct mv_cesa_engine;

/**
 * struct mv_cesa_caps - CESA device capabilities
 * @engines:            number of engines
 * @has_tdma:           whether this device has a TDMA block
 * @cipher_algs:        supported cipher algorithms
 * @ncipher_algs:       number of supported cipher algorithms
 * @ahash_algs:         supported hash algorithms
 * @nahash_algs:        number of supported hash algorithms
 *
 * Structure used to describe CESA device capabilities.
 */
struct mv_cesa_caps {
        int nengines;
        bool has_tdma;
        struct skcipher_alg **cipher_algs;
        int ncipher_algs;
        struct ahash_alg **ahash_algs;
        int nahash_algs;
};

/**
 * struct mv_cesa_dev_dma - DMA pools
 * @tdma_desc_pool:     TDMA desc pool
 * @op_pool:            crypto operation pool
 * @cache_pool:         data cache pool (used by hash implementation when the
 *                      hash request is smaller than the hash block size)
 * @padding_pool:       padding pool (used by hash implementation when hardware
 *                      padding cannot be used)
 *
 * Structure containing the different DMA pools used by this driver.
 */
struct mv_cesa_dev_dma {
        struct dma_pool *tdma_desc_pool;
        struct dma_pool *op_pool;
        struct dma_pool *cache_pool;
        struct dma_pool *padding_pool;
};

/**
 * struct mv_cesa_dev - CESA device
 * @caps:       device capabilities
 * @regs:       device registers
 * @sram_size:  usable SRAM size
 * @lock:       device lock
 * @engines:    array of engines
 * @dma:        dma pools
 *
 * Structure storing CESA device information.
 */
struct mv_cesa_dev {
        const struct mv_cesa_caps *caps;
        void __iomem *regs;
        struct device *dev;
        unsigned int sram_size;
        spinlock_t lock;
        struct mv_cesa_engine *engines;
        struct mv_cesa_dev_dma *dma;
};

/**
 * struct mv_cesa_engine - CESA engine
 * @id:                 engine id
 * @regs:               engine registers
 * @sram:               SRAM memory region
 * @sram_pool:          SRAM memory region from pool
 * @sram_dma:           DMA address of the SRAM memory region
 * @lock:               engine lock
 * @req:                current crypto request
 * @clk:                engine clk
 * @zclk:               engine zclk
 * @max_req_len:        maximum chunk length (useful to create the TDMA chain)
 * @int_mask:           interrupt mask cache
 * @pool:               memory pool pointing to the memory region reserved in
 *                      SRAM
 * @queue:              fifo of the pending crypto requests
 * @load:               engine load counter, useful for load balancing
 * @chain_hw:           list of the current tdma descriptors being processed
 *                      by the hardware.
 * @chain_sw:           list of the current tdma descriptors that will be
 *                      submitted to the hardware.
 * @complete_queue:     fifo of the processed requests by the engine
 *
 * Structure storing CESA engine information.
 */
struct mv_cesa_engine {
        int id;
        void __iomem *regs;
        union {
                void __iomem *sram;
                void *sram_pool;
        };
        dma_addr_t sram_dma;
        spinlock_t lock;
        struct crypto_async_request *req;
        struct clk *clk;
        struct clk *zclk;
        size_t max_req_len;
        u32 int_mask;
        struct gen_pool *pool;
        struct crypto_queue queue;
        atomic_t load;
        struct mv_cesa_tdma_chain chain_hw;
        struct mv_cesa_tdma_chain chain_sw;
        struct list_head complete_queue;
        int irq;
};

/**
 * struct mv_cesa_req_ops - CESA request operations
 * @process:    process a request chunk result (should return 0 if the
 *              operation, -EINPROGRESS if it needs more steps or an error
 *              code)
 * @step:       launch the crypto operation on the next chunk
 * @cleanup:    cleanup the crypto request (release associated data)
 * @complete:   complete the request, i.e copy result or context from sram when
 *              needed.
 */
struct mv_cesa_req_ops {
        int (*process)(struct crypto_async_request *req, u32 status);
        void (*step)(struct crypto_async_request *req);
        void (*cleanup)(struct crypto_async_request *req);
        void (*complete)(struct crypto_async_request *req);
};

/**
 * struct mv_cesa_ctx - CESA operation context
 * @ops:        crypto operations
 *
 * Base context structure inherited by operation specific ones.
 */
struct mv_cesa_ctx {
        const struct mv_cesa_req_ops *ops;
};

/**
 * struct mv_cesa_hash_ctx - CESA hash operation context
 * @base:       base context structure
 *
 * Hash context structure.
 */
struct mv_cesa_hash_ctx {
        struct mv_cesa_ctx base;
};

/**
 * struct mv_cesa_hash_ctx - CESA hmac operation context
 * @base:       base context structure
 * @iv:         initialization vectors
 *
 * HMAC context structure.
 */
struct mv_cesa_hmac_ctx {
        struct mv_cesa_ctx base;
        __be32 iv[16];
};

/**
 * enum mv_cesa_req_type - request type definitions
 * @CESA_STD_REQ:       standard request
 * @CESA_DMA_REQ:       DMA request
 */
enum mv_cesa_req_type {
        CESA_STD_REQ,
        CESA_DMA_REQ,
};

/**
 * struct mv_cesa_req - CESA request
 * @engine:     engine associated with this request
 * @chain:      list of tdma descriptors associated  with this request
 */
struct mv_cesa_req {
        struct mv_cesa_engine *engine;
        struct mv_cesa_tdma_chain chain;
};

/**
 * struct mv_cesa_sg_std_iter - CESA scatter-gather iterator for standard
 *                              requests
 * @iter:       sg mapping iterator
 * @offset:     current offset in the SG entry mapped in memory
 */
struct mv_cesa_sg_std_iter {
        struct sg_mapping_iter iter;
        unsigned int offset;
};

/**
 * struct mv_cesa_skcipher_std_req - cipher standard request
 * @op:         operation context
 * @offset:     current operation offset
 * @size:       size of the crypto operation
 */
struct mv_cesa_skcipher_std_req {
        struct mv_cesa_op_ctx op;
        unsigned int offset;
        unsigned int size;
        bool skip_ctx;
};

/**
 * struct mv_cesa_skcipher_req - cipher request
 * @req:        type specific request information
 * @src_nents:  number of entries in the src sg list
 * @dst_nents:  number of entries in the dest sg list
 */
struct mv_cesa_skcipher_req {
        struct mv_cesa_req base;
        struct mv_cesa_skcipher_std_req std;
        int src_nents;
        int dst_nents;
};

/**
 * struct mv_cesa_ahash_std_req - standard hash request
 * @offset:     current operation offset
 */
struct mv_cesa_ahash_std_req {
        unsigned int offset;
};

/**
 * struct mv_cesa_ahash_dma_req - DMA hash request
 * @padding:            padding buffer
 * @padding_dma:        DMA address of the padding buffer
 * @cache_dma:          DMA address of the cache buffer
 */
struct mv_cesa_ahash_dma_req {
        u8 *padding;
        dma_addr_t padding_dma;
        u8 *cache;
        dma_addr_t cache_dma;
};

/**
 * struct mv_cesa_ahash_req - hash request
 * @req:                type specific request information
 * @cache:              cache buffer
 * @cache_ptr:          write pointer in the cache buffer
 * @len:                hash total length
 * @src_nents:          number of entries in the scatterlist
 * @last_req:           define whether the current operation is the last one
 *                      or not
 * @state:              hash state
 */
struct mv_cesa_ahash_req {
        struct mv_cesa_req base;
        union {
                struct mv_cesa_ahash_dma_req dma;
                struct mv_cesa_ahash_std_req std;
        } req;
        struct mv_cesa_op_ctx op_tmpl;
        u8 cache[CESA_MAX_HASH_BLOCK_SIZE];
        unsigned int cache_ptr;
        u64 len;
        int src_nents;
        bool last_req;
        bool algo_le;
        u32 state[8];
};

/* CESA functions */

extern struct mv_cesa_dev *cesa_dev;


static inline void
mv_cesa_engine_enqueue_complete_request(struct mv_cesa_engine *engine,
                                        struct crypto_async_request *req)
{
        list_add_tail(&req->list, &engine->complete_queue);
}

static inline struct crypto_async_request *
mv_cesa_engine_dequeue_complete_request(struct mv_cesa_engine *engine)
{
        struct crypto_async_request *req;

        req = list_first_entry_or_null(&engine->complete_queue,
                                       struct crypto_async_request,
                                       list);
        if (req)
                list_del(&req->list);

        return req;
}


static inline enum mv_cesa_req_type
mv_cesa_req_get_type(struct mv_cesa_req *req)
{
        return req->chain.first ? CESA_DMA_REQ : CESA_STD_REQ;
}

static inline void mv_cesa_update_op_cfg(struct mv_cesa_op_ctx *op,
                                         u32 cfg, u32 mask)
{
        op->desc.config &= cpu_to_le32(~mask);
        op->desc.config |= cpu_to_le32(cfg);
}

static inline u32 mv_cesa_get_op_cfg(const struct mv_cesa_op_ctx *op)
{
        return le32_to_cpu(op->desc.config);
}

static inline void mv_cesa_set_op_cfg(struct mv_cesa_op_ctx *op, u32 cfg)
{
        op->desc.config = cpu_to_le32(cfg);
}

static inline void mv_cesa_adjust_op(struct mv_cesa_engine *engine,
                                     struct mv_cesa_op_ctx *op)
{
        u32 offset = engine->sram_dma & CESA_SA_SRAM_MSK;

        op->desc.enc_p = CESA_SA_DESC_CRYPT_DATA(offset);
        op->desc.enc_key_p = CESA_SA_DESC_CRYPT_KEY(offset);
        op->desc.enc_iv = CESA_SA_DESC_CRYPT_IV(offset);
        op->desc.mac_src_p &= ~CESA_SA_DESC_MAC_DATA_MSK;
        op->desc.mac_src_p |= CESA_SA_DESC_MAC_DATA(offset);
        op->desc.mac_digest &= ~CESA_SA_DESC_MAC_DIGEST_MSK;
        op->desc.mac_digest |= CESA_SA_DESC_MAC_DIGEST(offset);
        op->desc.mac_iv = CESA_SA_DESC_MAC_IV(offset);
}

static inline void mv_cesa_set_crypt_op_len(struct mv_cesa_op_ctx *op, int len)
{
        op->desc.enc_len = cpu_to_le32(len);
}

static inline void mv_cesa_set_mac_op_total_len(struct mv_cesa_op_ctx *op,
                                                int len)
{
        op->desc.mac_src_p &= ~CESA_SA_DESC_MAC_TOTAL_LEN_MSK;
        op->desc.mac_src_p |= CESA_SA_DESC_MAC_TOTAL_LEN(len);
}

static inline void mv_cesa_set_mac_op_frag_len(struct mv_cesa_op_ctx *op,
                                               int len)
{
        op->desc.mac_digest &= ~CESA_SA_DESC_MAC_FRAG_LEN_MSK;
        op->desc.mac_digest |= CESA_SA_DESC_MAC_FRAG_LEN(len);
}

static inline void mv_cesa_set_int_mask(struct mv_cesa_engine *engine,
                                        u32 int_mask)
{
        if (int_mask == engine->int_mask)
                return;

        writel_relaxed(int_mask, engine->regs + CESA_SA_INT_MSK);
        engine->int_mask = int_mask;
}

static inline u32 mv_cesa_get_int_mask(struct mv_cesa_engine *engine)
{
        return engine->int_mask;
}

static inline bool mv_cesa_mac_op_is_first_frag(const struct mv_cesa_op_ctx *op)
{
        return (mv_cesa_get_op_cfg(op) & CESA_SA_DESC_CFG_FRAG_MSK) ==
                CESA_SA_DESC_CFG_FIRST_FRAG;
}

int mv_cesa_queue_req(struct crypto_async_request *req,
                      struct mv_cesa_req *creq);

struct crypto_async_request *
mv_cesa_dequeue_req_locked(struct mv_cesa_engine *engine,
                           struct crypto_async_request **backlog);

static inline struct mv_cesa_engine *mv_cesa_select_engine(int weight)
{
        int i;
        u32 min_load = U32_MAX;
        struct mv_cesa_engine *selected = NULL;

        for (i = 0; i < cesa_dev->caps->nengines; i++) {
                struct mv_cesa_engine *engine = cesa_dev->engines + i;
                u32 load = atomic_read(&engine->load);

                if (load < min_load) {
                        min_load = load;
                        selected = engine;
                }
        }

        atomic_add(weight, &selected->load);

        return selected;
}

/*
 * Helper function that indicates whether a crypto request needs to be
 * cleaned up or not after being enqueued using mv_cesa_queue_req().
 */
static inline int mv_cesa_req_needs_cleanup(struct crypto_async_request *req,
                                            int ret)
{
        /*
         * The queue still had some space, the request was queued
         * normally, so there's no need to clean it up.
         */
        if (ret == -EINPROGRESS)
                return false;

        /*
         * The queue had not space left, but since the request is
         * flagged with CRYPTO_TFM_REQ_MAY_BACKLOG, it was added to
         * the backlog and will be processed later. There's no need to
         * clean it up.
         */
        if (ret == -EBUSY)
                return false;

        /* Request wasn't queued, we need to clean it up */
        return true;
}

/* TDMA functions */

static inline void mv_cesa_req_dma_iter_init(struct mv_cesa_dma_iter *iter,
                                             unsigned int len)
{
        iter->len = len;
        iter->op_len = min(len, CESA_SA_SRAM_PAYLOAD_SIZE);
        iter->offset = 0;
}

static inline void mv_cesa_sg_dma_iter_init(struct mv_cesa_sg_dma_iter *iter,
                                            struct scatterlist *sg,
                                            enum dma_data_direction dir)
{
        iter->op_offset = 0;
        iter->offset = 0;
        iter->sg = sg;
        iter->dir = dir;
}

static inline unsigned int
mv_cesa_req_dma_iter_transfer_len(struct mv_cesa_dma_iter *iter,
                                  struct mv_cesa_sg_dma_iter *sgiter)
{
        return min(iter->op_len - sgiter->op_offset,
                   sg_dma_len(sgiter->sg) - sgiter->offset);
}

bool mv_cesa_req_dma_iter_next_transfer(struct mv_cesa_dma_iter *chain,
                                        struct mv_cesa_sg_dma_iter *sgiter,
                                        unsigned int len);

static inline bool mv_cesa_req_dma_iter_next_op(struct mv_cesa_dma_iter *iter)
{
        iter->offset += iter->op_len;
        iter->op_len = min(iter->len - iter->offset,
                           CESA_SA_SRAM_PAYLOAD_SIZE);

        return iter->op_len;
}

void mv_cesa_dma_step(struct mv_cesa_req *dreq);

static inline int mv_cesa_dma_process(struct mv_cesa_req *dreq,
                                      u32 status)
{
        if (!(status & CESA_SA_INT_ACC0_IDMA_DONE))
                return -EINPROGRESS;

        if (status & CESA_SA_INT_IDMA_OWN_ERR)
                return -EINVAL;

        return 0;
}

void mv_cesa_dma_prepare(struct mv_cesa_req *dreq,
                         struct mv_cesa_engine *engine);
void mv_cesa_dma_cleanup(struct mv_cesa_req *dreq);
void mv_cesa_tdma_chain(struct mv_cesa_engine *engine,
                        struct mv_cesa_req *dreq);
int mv_cesa_tdma_process(struct mv_cesa_engine *engine, u32 status);


static inline void
mv_cesa_tdma_desc_iter_init(struct mv_cesa_tdma_chain *chain)
{
        memset(chain, 0, sizeof(*chain));
}

int mv_cesa_dma_add_result_op(struct mv_cesa_tdma_chain *chain, dma_addr_t src,
                          u32 size, u32 flags, gfp_t gfp_flags);

struct mv_cesa_op_ctx *mv_cesa_dma_add_op(struct mv_cesa_tdma_chain *chain,
                                        const struct mv_cesa_op_ctx *op_templ,
                                        bool skip_ctx,
                                        gfp_t flags);

int mv_cesa_dma_add_data_transfer(struct mv_cesa_tdma_chain *chain,
                                  dma_addr_t dst, dma_addr_t src, u32 size,
                                  u32 flags, gfp_t gfp_flags);

int mv_cesa_dma_add_dummy_launch(struct mv_cesa_tdma_chain *chain, gfp_t flags);
int mv_cesa_dma_add_dummy_end(struct mv_cesa_tdma_chain *chain, gfp_t flags);

int mv_cesa_dma_add_op_transfers(struct mv_cesa_tdma_chain *chain,
                                 struct mv_cesa_dma_iter *dma_iter,
                                 struct mv_cesa_sg_dma_iter *sgiter,
                                 gfp_t gfp_flags);

size_t mv_cesa_sg_copy(struct mv_cesa_engine *engine,
                       struct scatterlist *sgl, unsigned int nents,
                       unsigned int sram_off, size_t buflen, off_t skip,
                       bool to_sram);

static inline size_t mv_cesa_sg_copy_to_sram(struct mv_cesa_engine *engine,
                                             struct scatterlist *sgl,
                                             unsigned int nents,
                                             unsigned int sram_off,
                                             size_t buflen, off_t skip)
{
        return mv_cesa_sg_copy(engine, sgl, nents, sram_off, buflen, skip,
                               true);
}

static inline size_t mv_cesa_sg_copy_from_sram(struct mv_cesa_engine *engine,
                                               struct scatterlist *sgl,
                                               unsigned int nents,
                                               unsigned int sram_off,
                                               size_t buflen, off_t skip)
{
        return mv_cesa_sg_copy(engine, sgl, nents, sram_off, buflen, skip,
                               false);
}

/* Algorithm definitions */

extern struct ahash_alg mv_md5_alg;
extern struct ahash_alg mv_sha1_alg;
extern struct ahash_alg mv_sha256_alg;
extern struct ahash_alg mv_ahmac_md5_alg;
extern struct ahash_alg mv_ahmac_sha1_alg;
extern struct ahash_alg mv_ahmac_sha256_alg;

extern struct skcipher_alg mv_cesa_ecb_des_alg;
extern struct skcipher_alg mv_cesa_cbc_des_alg;
extern struct skcipher_alg mv_cesa_ecb_des3_ede_alg;
extern struct skcipher_alg mv_cesa_cbc_des3_ede_alg;
extern struct skcipher_alg mv_cesa_ecb_aes_alg;
extern struct skcipher_alg mv_cesa_cbc_aes_alg;

#endif /* __MARVELL_CESA_H__ */