/*
 * Intel IXP4xx NPE-C crypto driver
 *
 * Copyright (C) 2008 Christian Hohnstaedt <chohnstaedt@innominate.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License
 * as published by the Free Software Foundation.
 *
 */

#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/crypto.h>
#include <linux/kernel.h>
#include <linux/rtnetlink.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>

#include <crypto/ctr.h>
#include <crypto/des.h>
#include <crypto/aes.h>
#include <crypto/sha.h>
#include <crypto/algapi.h>
#include <crypto/aead.h>
#include <crypto/authenc.h>
#include <crypto/scatterwalk.h>

#include <mach/npe.h>
#include <mach/qmgr.h>

#define MAX_KEYLEN 32

/* hash: cfgword + 2 * digestlen; crypt: keylen + cfgword */
#define NPE_CTX_LEN 80
#define AES_BLOCK128 16

#define NPE_OP_HASH_VERIFY   0x01
#define NPE_OP_CCM_ENABLE    0x04
#define NPE_OP_CRYPT_ENABLE  0x08
#define NPE_OP_HASH_ENABLE   0x10
#define NPE_OP_NOT_IN_PLACE  0x20
#define NPE_OP_HMAC_DISABLE  0x40
#define NPE_OP_CRYPT_ENCRYPT 0x80

#define NPE_OP_CCM_GEN_MIC   0xcc
#define NPE_OP_HASH_GEN_ICV  0x50
#define NPE_OP_ENC_GEN_KEY   0xc9

#define MOD_ECB     0x0000
#define MOD_CTR     0x1000
#define MOD_CBC_ENC 0x2000
#define MOD_CBC_DEC 0x3000
#define MOD_CCM_ENC 0x4000
#define MOD_CCM_DEC 0x5000

#define KEYLEN_128  4
#define KEYLEN_192  6
#define KEYLEN_256  8

#define CIPH_DECR   0x0000
#define CIPH_ENCR   0x0400

#define MOD_DES     0x0000
#define MOD_TDEA2   0x0100
#define MOD_3DES   0x0200
#define MOD_AES     0x0800
#define MOD_AES128  (0x0800 | KEYLEN_128)
#define MOD_AES192  (0x0900 | KEYLEN_192)
#define MOD_AES256  (0x0a00 | KEYLEN_256)

#define MAX_IVLEN   16
#define NPE_ID      2  /* NPE C */
#define NPE_QLEN    16
/* Space for registering when the first
 * NPE_QLEN crypt_ctl are busy */
#define NPE_QLEN_TOTAL 64

#define SEND_QID    29
#define RECV_QID    30

#define CTL_FLAG_UNUSED         0x0000
#define CTL_FLAG_USED           0x1000
#define CTL_FLAG_PERFORM_ABLK   0x0001
#define CTL_FLAG_GEN_ICV        0x0002
#define CTL_FLAG_GEN_REVAES     0x0004
#define CTL_FLAG_PERFORM_AEAD   0x0008
#define CTL_FLAG_MASK           0x000f

#define HMAC_IPAD_VALUE   0x36
#define HMAC_OPAD_VALUE   0x5C
#define HMAC_PAD_BLOCKLEN SHA1_BLOCK_SIZE

#define MD5_DIGEST_SIZE   16

struct buffer_desc {
        u32 phys_next;
        u16 buf_len;
        u16 pkt_len;
        u32 phys_addr;
        u32 __reserved[4];
        struct buffer_desc *next;
        enum dma_data_direction dir;
};

struct crypt_ctl {
        u8 mode;                /* NPE_OP_*  operation mode */
        u8 init_len;
        u16 reserved;
        u8 iv[MAX_IVLEN];       /* IV for CBC mode or CTR IV for CTR mode */
        u32 icv_rev_aes;        /* icv or rev aes */
        u32 src_buf;
        u32 dst_buf;
        u16 auth_offs;          /* Authentication start offset */
        u16 auth_len;           /* Authentication data length */
        u16 crypt_offs;         /* Cryption start offset */
        u16 crypt_len;          /* Cryption data length */
        u32 aadAddr;            /* Additional Auth Data Addr for CCM mode */
        u32 crypto_ctx;         /* NPE Crypto Param structure address */

        /* Used by Host: 4*4 bytes*/
        unsigned ctl_flags;
        union {
                struct ablkcipher_request *ablk_req;
                struct aead_request *aead_req;
                struct crypto_tfm *tfm;
        } data;
        struct buffer_desc *regist_buf;
        u8 *regist_ptr;
};

struct ablk_ctx {
        struct buffer_desc *src;
        struct buffer_desc *dst;
};

struct aead_ctx {
        struct buffer_desc *buffer;
        struct scatterlist ivlist;
        /* used when the hmac is not on one sg entry */
        u8 *hmac_virt;
        int encrypt;
};

struct ix_hash_algo {
        u32 cfgword;
        unsigned char *icv;
};

struct ix_sa_dir {
        unsigned char *npe_ctx;
        dma_addr_t npe_ctx_phys;
        int npe_ctx_idx;
        u8 npe_mode;
};

struct ixp_ctx {
        struct ix_sa_dir encrypt;
        struct ix_sa_dir decrypt;
        int authkey_len;
        u8 authkey[MAX_KEYLEN];
        int enckey_len;
        u8 enckey[MAX_KEYLEN];
        u8 salt[MAX_IVLEN];
        u8 nonce[CTR_RFC3686_NONCE_SIZE];
        unsigned salted;
        atomic_t configuring;
        struct completion completion;
};

struct ixp_alg {
        struct crypto_alg crypto;
        const struct ix_hash_algo *hash;
        u32 cfg_enc;
        u32 cfg_dec;

        int registered;
};

static const struct ix_hash_algo hash_alg_md5 = {
        .cfgword        = 0xAA010004,
        .icv            = "\x01\x23\x45\x67\x89\xAB\xCD\xEF"
                          "\xFE\xDC\xBA\x98\x76\x54\x32\x10",
};
static const struct ix_hash_algo hash_alg_sha1 = {
        .cfgword        = 0x00000005,
        .icv            = "\x67\x45\x23\x01\xEF\xCD\xAB\x89\x98\xBA"
                          "\xDC\xFE\x10\x32\x54\x76\xC3\xD2\xE1\xF0",
};

static struct npe *npe_c;
static struct dma_pool *buffer_pool = NULL;
static struct dma_pool *ctx_pool = NULL;

static struct crypt_ctl *crypt_virt = NULL;
static dma_addr_t crypt_phys;

static int support_aes = 1;

static void dev_release(struct device *dev)
{
        return;
}

#define DRIVER_NAME "ixp4xx_crypto"
static struct platform_device pseudo_dev = {
        .name = DRIVER_NAME,
        .id   = 0,
        .num_resources = 0,
        .dev  = {
                .coherent_dma_mask = DMA_BIT_MASK(32),
                .release = dev_release,
        }
};

static struct device *dev = &pseudo_dev.dev;

static inline dma_addr_t crypt_virt2phys(struct crypt_ctl *virt)
{
        return crypt_phys + (virt - crypt_virt) * sizeof(struct crypt_ctl);
}

static inline struct crypt_ctl *crypt_phys2virt(dma_addr_t phys)
{
        return crypt_virt + (phys - crypt_phys) / sizeof(struct crypt_ctl);
}

static inline u32 cipher_cfg_enc(struct crypto_tfm *tfm)
{
        return container_of(tfm->__crt_alg, struct ixp_alg,crypto)->cfg_enc;
}

static inline u32 cipher_cfg_dec(struct crypto_tfm *tfm)
{
        return container_of(tfm->__crt_alg, struct ixp_alg,crypto)->cfg_dec;
}

static inline const struct ix_hash_algo *ix_hash(struct crypto_tfm *tfm)
{
        return container_of(tfm->__crt_alg, struct ixp_alg, crypto)->hash;
}

static int setup_crypt_desc(void)
{
        BUILD_BUG_ON(sizeof(struct crypt_ctl) != 64);
        crypt_virt = dma_alloc_coherent(dev,
                        NPE_QLEN * sizeof(struct crypt_ctl),
                        &crypt_phys, GFP_KERNEL);
        if (!crypt_virt)
                return -ENOMEM;
        memset(crypt_virt, 0, NPE_QLEN * sizeof(struct crypt_ctl));
        return 0;
}

static spinlock_t desc_lock;
static struct crypt_ctl *get_crypt_desc(void)
{
        int i;
        static int idx = 0;
        unsigned long flags;

        spin_lock_irqsave(&desc_lock, flags);

        if (unlikely(!crypt_virt))
                setup_crypt_desc();
        if (unlikely(!crypt_virt)) {
                spin_unlock_irqrestore(&desc_lock, flags);
                return NULL;
        }
        i = idx;
        if (crypt_virt[i].ctl_flags == CTL_FLAG_UNUSED) {
                if (++idx >= NPE_QLEN)
                        idx = 0;
                crypt_virt[i].ctl_flags = CTL_FLAG_USED;
                spin_unlock_irqrestore(&desc_lock, flags);
                return crypt_virt +i;
        } else {
                spin_unlock_irqrestore(&desc_lock, flags);
                return NULL;
        }
}

static spinlock_t emerg_lock;
static struct crypt_ctl *get_crypt_desc_emerg(void)
{
        int i;
        static int idx = NPE_QLEN;
        struct crypt_ctl *desc;
        unsigned long flags;

        desc = get_crypt_desc();
        if (desc)
                return desc;
        if (unlikely(!crypt_virt))
                return NULL;

        spin_lock_irqsave(&emerg_lock, flags);
        i = idx;
        if (crypt_virt[i].ctl_flags == CTL_FLAG_UNUSED) {
                if (++idx >= NPE_QLEN_TOTAL)
                        idx = NPE_QLEN;
                crypt_virt[i].ctl_flags = CTL_FLAG_USED;
                spin_unlock_irqrestore(&emerg_lock, flags);
                return crypt_virt +i;
        } else {
                spin_unlock_irqrestore(&emerg_lock, flags);
                return NULL;
        }
}

static void free_buf_chain(struct device *dev, struct buffer_desc *buf,u32 phys)
{
        while (buf) {
                struct buffer_desc *buf1;
                u32 phys1;

                buf1 = buf->next;
                phys1 = buf->phys_next;
                dma_unmap_single(dev, buf->phys_next, buf->buf_len, buf->dir);
                dma_pool_free(buffer_pool, buf, phys);
                buf = buf1;
                phys = phys1;
        }
}

static struct tasklet_struct crypto_done_tasklet;

static void finish_scattered_hmac(struct crypt_ctl *crypt)
{
        struct aead_request *req = crypt->data.aead_req;
        struct aead_ctx *req_ctx = aead_request_ctx(req);
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        int authsize = crypto_aead_authsize(tfm);
        int decryptlen = req->cryptlen - authsize;

        if (req_ctx->encrypt) {
                scatterwalk_map_and_copy(req_ctx->hmac_virt,
                        req->src, decryptlen, authsize, 1);
        }
        dma_pool_free(buffer_pool, req_ctx->hmac_virt, crypt->icv_rev_aes);
}

static void one_packet(dma_addr_t phys)
{
        struct crypt_ctl *crypt;
        struct ixp_ctx *ctx;
        int failed;

        failed = phys & 0x1 ? -EBADMSG : 0;
        phys &= ~0x3;
        crypt = crypt_phys2virt(phys);

        switch (crypt->ctl_flags & CTL_FLAG_MASK) {
        case CTL_FLAG_PERFORM_AEAD: {
                struct aead_request *req = crypt->data.aead_req;
                struct aead_ctx *req_ctx = aead_request_ctx(req);

                free_buf_chain(dev, req_ctx->buffer, crypt->src_buf);
                if (req_ctx->hmac_virt) {
                        finish_scattered_hmac(crypt);
                }
                req->base.complete(&req->base, failed);
                break;
        }
        case CTL_FLAG_PERFORM_ABLK: {
                struct ablkcipher_request *req = crypt->data.ablk_req;
                struct ablk_ctx *req_ctx = ablkcipher_request_ctx(req);

                if (req_ctx->dst) {
                        free_buf_chain(dev, req_ctx->dst, crypt->dst_buf);
                }
                free_buf_chain(dev, req_ctx->src, crypt->src_buf);
                req->base.complete(&req->base, failed);
                break;
        }
        case CTL_FLAG_GEN_ICV:
                ctx = crypto_tfm_ctx(crypt->data.tfm);
                dma_pool_free(ctx_pool, crypt->regist_ptr,
                                crypt->regist_buf->phys_addr);
                dma_pool_free(buffer_pool, crypt->regist_buf, crypt->src_buf);
                if (atomic_dec_and_test(&ctx->configuring))
                        complete(&ctx->completion);
                break;
        case CTL_FLAG_GEN_REVAES:
                ctx = crypto_tfm_ctx(crypt->data.tfm);
                *(u32*)ctx->decrypt.npe_ctx &= cpu_to_be32(~CIPH_ENCR);
                if (atomic_dec_and_test(&ctx->configuring))
                        complete(&ctx->completion);
                break;
        default:
                BUG();
        }
        crypt->ctl_flags = CTL_FLAG_UNUSED;
}

static void irqhandler(void *_unused)
{
        tasklet_schedule(&crypto_done_tasklet);
}

static void crypto_done_action(unsigned long arg)
{
        int i;

        for(i=0; i<4; i++) {
                dma_addr_t phys = qmgr_get_entry(RECV_QID);
                if (!phys)
                        return;
                one_packet(phys);
        }
        tasklet_schedule(&crypto_done_tasklet);
}

static int init_ixp_crypto(void)
{
        int ret = -ENODEV;
        u32 msg[2] = { 0, 0 };

        if (! ( ~(*IXP4XX_EXP_CFG2) & (IXP4XX_FEATURE_HASH |
                                IXP4XX_FEATURE_AES | IXP4XX_FEATURE_DES))) {
                printk(KERN_ERR "ixp_crypto: No HW crypto available\n");
                return ret;
        }
        npe_c = npe_request(NPE_ID);
        if (!npe_c)
                return ret;

        if (!npe_running(npe_c)) {
                ret = npe_load_firmware(npe_c, npe_name(npe_c), dev);
                if (ret) {
                        return ret;
                }
                if (npe_recv_message(npe_c, msg, "STATUS_MSG"))
                        goto npe_error;
        } else {
                if (npe_send_message(npe_c, msg, "STATUS_MSG"))
                        goto npe_error;

                if (npe_recv_message(npe_c, msg, "STATUS_MSG"))
                        goto npe_error;
        }

        switch ((msg[1]>>16) & 0xff) {
        case 3:
                printk(KERN_WARNING "Firmware of %s lacks AES support\n",
                                npe_name(npe_c));
                support_aes = 0;
                break;
        case 4:
        case 5:
                support_aes = 1;
                break;
        default:
                printk(KERN_ERR "Firmware of %s lacks crypto support\n",
                        npe_name(npe_c));
                return -ENODEV;
        }
        /* buffer_pool will also be used to sometimes store the hmac,
         * so assure it is large enough
         */
        BUILD_BUG_ON(SHA1_DIGEST_SIZE > sizeof(struct buffer_desc));
        buffer_pool = dma_pool_create("buffer", dev,
                        sizeof(struct buffer_desc), 32, 0);
        ret = -ENOMEM;
        if (!buffer_pool) {
                goto err;
        }
        ctx_pool = dma_pool_create("context", dev,
                        NPE_CTX_LEN, 16, 0);
        if (!ctx_pool) {
                goto err;
        }
        ret = qmgr_request_queue(SEND_QID, NPE_QLEN_TOTAL, 0, 0,
                                 "ixp_crypto:out", NULL);
        if (ret)
                goto err;
        ret = qmgr_request_queue(RECV_QID, NPE_QLEN, 0, 0,
                                 "ixp_crypto:in", NULL);
        if (ret) {
                qmgr_release_queue(SEND_QID);
                goto err;
        }
        qmgr_set_irq(RECV_QID, QUEUE_IRQ_SRC_NOT_EMPTY, irqhandler, NULL);
        tasklet_init(&crypto_done_tasklet, crypto_done_action, 0);

        qmgr_enable_irq(RECV_QID);
        return 0;

npe_error:
        printk(KERN_ERR "%s not responding\n", npe_name(npe_c));
        ret = -EIO;
err:
        if (ctx_pool)
                dma_pool_destroy(ctx_pool);
        if (buffer_pool)
                dma_pool_destroy(buffer_pool);
        npe_release(npe_c);
        return ret;
}

static void release_ixp_crypto(void)
{
        qmgr_disable_irq(RECV_QID);
        tasklet_kill(&crypto_done_tasklet);

        qmgr_release_queue(SEND_QID);
        qmgr_release_queue(RECV_QID);

        dma_pool_destroy(ctx_pool);
        dma_pool_destroy(buffer_pool);

        npe_release(npe_c);

        if (crypt_virt) {
                dma_free_coherent(dev,
                        NPE_QLEN_TOTAL * sizeof( struct crypt_ctl),
                        crypt_virt, crypt_phys);
        }
        return;
}

static void reset_sa_dir(struct ix_sa_dir *dir)
{
        memset(dir->npe_ctx, 0, NPE_CTX_LEN);
        dir->npe_ctx_idx = 0;
        dir->npe_mode = 0;
}

static int init_sa_dir(struct ix_sa_dir *dir)
{
        dir->npe_ctx = dma_pool_alloc(ctx_pool, GFP_KERNEL, &dir->npe_ctx_phys);
        if (!dir->npe_ctx) {
                return -ENOMEM;
        }
        reset_sa_dir(dir);
        return 0;
}

static void free_sa_dir(struct ix_sa_dir *dir)
{
        memset(dir->npe_ctx, 0, NPE_CTX_LEN);
        dma_pool_free(ctx_pool, dir->npe_ctx, dir->npe_ctx_phys);
}

static int init_tfm(struct crypto_tfm *tfm)
{
        struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
        int ret;

        atomic_set(&ctx->configuring, 0);
        ret = init_sa_dir(&ctx->encrypt);
        if (ret)
                return ret;
        ret = init_sa_dir(&ctx->decrypt);
        if (ret) {
                free_sa_dir(&ctx->encrypt);
        }
        return ret;
}

static int init_tfm_ablk(struct crypto_tfm *tfm)
{
        tfm->crt_ablkcipher.reqsize = sizeof(struct ablk_ctx);
        return init_tfm(tfm);
}

static int init_tfm_aead(struct crypto_tfm *tfm)
{
        tfm->crt_aead.reqsize = sizeof(struct aead_ctx);
        return init_tfm(tfm);
}

static void exit_tfm(struct crypto_tfm *tfm)
{
        struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
        free_sa_dir(&ctx->encrypt);
        free_sa_dir(&ctx->decrypt);
}

static int register_chain_var(struct crypto_tfm *tfm, u8 xpad, u32 target,
                int init_len, u32 ctx_addr, const u8 *key, int key_len)
{
        struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
        struct crypt_ctl *crypt;
        struct buffer_desc *buf;
        int i;
        u8 *pad;
        u32 pad_phys, buf_phys;

        BUILD_BUG_ON(NPE_CTX_LEN < HMAC_PAD_BLOCKLEN);
        pad = dma_pool_alloc(ctx_pool, GFP_KERNEL, &pad_phys);
        if (!pad)
                return -ENOMEM;
        buf = dma_pool_alloc(buffer_pool, GFP_KERNEL, &buf_phys);
        if (!buf) {
                dma_pool_free(ctx_pool, pad, pad_phys);
                return -ENOMEM;
        }
        crypt = get_crypt_desc_emerg();
        if (!crypt) {
                dma_pool_free(ctx_pool, pad, pad_phys);
                dma_pool_free(buffer_pool, buf, buf_phys);
                return -EAGAIN;
        }

        memcpy(pad, key, key_len);
        memset(pad + key_len, 0, HMAC_PAD_BLOCKLEN - key_len);
        for (i = 0; i < HMAC_PAD_BLOCKLEN; i++) {
                pad[i] ^= xpad;
        }

        crypt->data.tfm = tfm;
        crypt->regist_ptr = pad;
        crypt->regist_buf = buf;

        crypt->auth_offs = 0;
        crypt->auth_len = HMAC_PAD_BLOCKLEN;
        crypt->crypto_ctx = ctx_addr;
        crypt->src_buf = buf_phys;
        crypt->icv_rev_aes = target;
        crypt->mode = NPE_OP_HASH_GEN_ICV;
        crypt->init_len = init_len;
        crypt->ctl_flags |= CTL_FLAG_GEN_ICV;

        buf->next = 0;
        buf->buf_len = HMAC_PAD_BLOCKLEN;
        buf->pkt_len = 0;
        buf->phys_addr = pad_phys;

        atomic_inc(&ctx->configuring);
        qmgr_put_entry(SEND_QID, crypt_virt2phys(crypt));
        BUG_ON(qmgr_stat_overflow(SEND_QID));
        return 0;
}

static int setup_auth(struct crypto_tfm *tfm, int encrypt, unsigned authsize,
                const u8 *key, int key_len, unsigned digest_len)
{
        u32 itarget, otarget, npe_ctx_addr;
        unsigned char *cinfo;
        int init_len, ret = 0;
        u32 cfgword;
        struct ix_sa_dir *dir;
        struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
        const struct ix_hash_algo *algo;

        dir = encrypt ? &ctx->encrypt : &ctx->decrypt;
        cinfo = dir->npe_ctx + dir->npe_ctx_idx;
        algo = ix_hash(tfm);

        /* write cfg word to cryptinfo */
        cfgword = algo->cfgword | ( authsize << 6); /* (authsize/4) << 8 */
        *(u32*)cinfo = cpu_to_be32(cfgword);
        cinfo += sizeof(cfgword);

        /* write ICV to cryptinfo */
        memcpy(cinfo, algo->icv, digest_len);
        cinfo += digest_len;

        itarget = dir->npe_ctx_phys + dir->npe_ctx_idx
                                + sizeof(algo->cfgword);
        otarget = itarget + digest_len;
        init_len = cinfo - (dir->npe_ctx + dir->npe_ctx_idx);
        npe_ctx_addr = dir->npe_ctx_phys + dir->npe_ctx_idx;

        dir->npe_ctx_idx += init_len;
        dir->npe_mode |= NPE_OP_HASH_ENABLE;

        if (!encrypt)
                dir->npe_mode |= NPE_OP_HASH_VERIFY;

        ret = register_chain_var(tfm, HMAC_OPAD_VALUE, otarget,
                        init_len, npe_ctx_addr, key, key_len);
        if (ret)
                return ret;
        return register_chain_var(tfm, HMAC_IPAD_VALUE, itarget,
                        init_len, npe_ctx_addr, key, key_len);
}

static int gen_rev_aes_key(struct crypto_tfm *tfm)
{
        struct crypt_ctl *crypt;
        struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
        struct ix_sa_dir *dir = &ctx->decrypt;

        crypt = get_crypt_desc_emerg();
        if (!crypt) {
                return -EAGAIN;
        }
        *(u32*)dir->npe_ctx |= cpu_to_be32(CIPH_ENCR);

        crypt->data.tfm = tfm;
        crypt->crypt_offs = 0;
        crypt->crypt_len = AES_BLOCK128;
        crypt->src_buf = 0;
        crypt->crypto_ctx = dir->npe_ctx_phys;
        crypt->icv_rev_aes = dir->npe_ctx_phys + sizeof(u32);
        crypt->mode = NPE_OP_ENC_GEN_KEY;
        crypt->init_len = dir->npe_ctx_idx;
        crypt->ctl_flags |= CTL_FLAG_GEN_REVAES;

        atomic_inc(&ctx->configuring);
        qmgr_put_entry(SEND_QID, crypt_virt2phys(crypt));
        BUG_ON(qmgr_stat_overflow(SEND_QID));
        return 0;
}

static int setup_cipher(struct crypto_tfm *tfm, int encrypt,
                const u8 *key, int key_len)
{
        u8 *cinfo;
        u32 cipher_cfg;
        u32 keylen_cfg = 0;
        struct ix_sa_dir *dir;
        struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
        u32 *flags = &tfm->crt_flags;

        dir = encrypt ? &ctx->encrypt : &ctx->decrypt;
        cinfo = dir->npe_ctx;

        if (encrypt) {
                cipher_cfg = cipher_cfg_enc(tfm);
                dir->npe_mode |= NPE_OP_CRYPT_ENCRYPT;
        } else {
                cipher_cfg = cipher_cfg_dec(tfm);
        }
        if (cipher_cfg & MOD_AES) {
                switch (key_len) {
                        case 16: keylen_cfg = MOD_AES128 | KEYLEN_128; break;
                        case 24: keylen_cfg = MOD_AES192 | KEYLEN_192; break;
                        case 32: keylen_cfg = MOD_AES256 | KEYLEN_256; break;
                        default:
                                *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
                                return -EINVAL;
                }
                cipher_cfg |= keylen_cfg;
        } else if (cipher_cfg & MOD_3DES) {
                const u32 *K = (const u32 *)key;
                if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
                             !((K[2] ^ K[4]) | (K[3] ^ K[5]))))
                {
                        *flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
                        return -EINVAL;
                }
        } else {
                u32 tmp[DES_EXPKEY_WORDS];
                if (des_ekey(tmp, key) == 0) {
                        *flags |= CRYPTO_TFM_RES_WEAK_KEY;
                }
        }
        /* write cfg word to cryptinfo */
        *(u32*)cinfo = cpu_to_be32(cipher_cfg);
        cinfo += sizeof(cipher_cfg);

        /* write cipher key to cryptinfo */
        memcpy(cinfo, key, key_len);
        /* NPE wants keylen set to DES3_EDE_KEY_SIZE even for single DES */
        if (key_len < DES3_EDE_KEY_SIZE && !(cipher_cfg & MOD_AES)) {
                memset(cinfo + key_len, 0, DES3_EDE_KEY_SIZE -key_len);
                key_len = DES3_EDE_KEY_SIZE;
        }
        dir->npe_ctx_idx = sizeof(cipher_cfg) + key_len;
        dir->npe_mode |= NPE_OP_CRYPT_ENABLE;
        if ((cipher_cfg & MOD_AES) && !encrypt) {
                return gen_rev_aes_key(tfm);
        }
        return 0;
}

static struct buffer_desc *chainup_buffers(struct device *dev,
                struct scatterlist *sg, unsigned nbytes,
                struct buffer_desc *buf, gfp_t flags,
                enum dma_data_direction dir)
{
        for (;nbytes > 0; sg = scatterwalk_sg_next(sg)) {
                unsigned len = min(nbytes, sg->length);
                struct buffer_desc *next_buf;
                u32 next_buf_phys;
                void *ptr;

                nbytes -= len;
                ptr = page_address(sg_page(sg)) + sg->offset;
                next_buf = dma_pool_alloc(buffer_pool, flags, &next_buf_phys);
                if (!next_buf) {
                        buf = NULL;
                        break;
                }
                sg_dma_address(sg) = dma_map_single(dev, ptr, len, dir);
                buf->next = next_buf;
                buf->phys_next = next_buf_phys;
                buf = next_buf;

                buf->phys_addr = sg_dma_address(sg);
                buf->buf_len = len;
                buf->dir = dir;
        }
        buf->next = NULL;
        buf->phys_next = 0;
        return buf;
}

static int ablk_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
                        unsigned int key_len)
{
        struct ixp_ctx *ctx = crypto_ablkcipher_ctx(tfm);
        u32 *flags = &tfm->base.crt_flags;
        int ret;

        init_completion(&ctx->completion);
        atomic_inc(&ctx->configuring);

        reset_sa_dir(&ctx->encrypt);
        reset_sa_dir(&ctx->decrypt);

        ctx->encrypt.npe_mode = NPE_OP_HMAC_DISABLE;
        ctx->decrypt.npe_mode = NPE_OP_HMAC_DISABLE;

        ret = setup_cipher(&tfm->base, 0, key, key_len);
        if (ret)
                goto out;
        ret = setup_cipher(&tfm->base, 1, key, key_len);
        if (ret)
                goto out;

        if (*flags & CRYPTO_TFM_RES_WEAK_KEY) {
                if (*flags & CRYPTO_TFM_REQ_WEAK_KEY) {
                        ret = -EINVAL;
                } else {
                        *flags &= ~CRYPTO_TFM_RES_WEAK_KEY;
                }
        }
out:
        if (!atomic_dec_and_test(&ctx->configuring))
                wait_for_completion(&ctx->completion);
        return ret;
}

static int ablk_rfc3686_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
                unsigned int key_len)
{
        struct ixp_ctx *ctx = crypto_ablkcipher_ctx(tfm);

        /* the nonce is stored in bytes at end of key */
        if (key_len < CTR_RFC3686_NONCE_SIZE)
                return -EINVAL;

        memcpy(ctx->nonce, key + (key_len - CTR_RFC3686_NONCE_SIZE),
                        CTR_RFC3686_NONCE_SIZE);

        key_len -= CTR_RFC3686_NONCE_SIZE;
        return ablk_setkey(tfm, key, key_len);
}

static int ablk_perform(struct ablkcipher_request *req, int encrypt)
{
        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
        struct ixp_ctx *ctx = crypto_ablkcipher_ctx(tfm);
        unsigned ivsize = crypto_ablkcipher_ivsize(tfm);
        struct ix_sa_dir *dir;
        struct crypt_ctl *crypt;
        unsigned int nbytes = req->nbytes;
        enum dma_data_direction src_direction = DMA_BIDIRECTIONAL;
        struct ablk_ctx *req_ctx = ablkcipher_request_ctx(req);
        struct buffer_desc src_hook;
        gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
                                GFP_KERNEL : GFP_ATOMIC;

        if (qmgr_stat_full(SEND_QID))
                return -EAGAIN;
        if (atomic_read(&ctx->configuring))
                return -EAGAIN;

        dir = encrypt ? &ctx->encrypt : &ctx->decrypt;

        crypt = get_crypt_desc();
        if (!crypt)
                return -ENOMEM;

        crypt->data.ablk_req = req;
        crypt->crypto_ctx = dir->npe_ctx_phys;
        crypt->mode = dir->npe_mode;
        crypt->init_len = dir->npe_ctx_idx;

        crypt->crypt_offs = 0;
        crypt->crypt_len = nbytes;

        BUG_ON(ivsize && !req->info);
        memcpy(crypt->iv, req->info, ivsize);
        if (req->src != req->dst) {
                struct buffer_desc dst_hook;
                crypt->mode |= NPE_OP_NOT_IN_PLACE;
                /* This was never tested by Intel
                 * for more than one dst buffer, I think. */
                BUG_ON(req->dst->length < nbytes);
                req_ctx->dst = NULL;
                if (!chainup_buffers(dev, req->dst, nbytes, &dst_hook,
                                        flags, DMA_FROM_DEVICE))
                        goto free_buf_dest;
                src_direction = DMA_TO_DEVICE;
                req_ctx->dst = dst_hook.next;
                crypt->dst_buf = dst_hook.phys_next;
        } else {
                req_ctx->dst = NULL;
        }
        req_ctx->src = NULL;
        if (!chainup_buffers(dev, req->src, nbytes, &src_hook,
                                flags, src_direction))
                goto free_buf_src;

        req_ctx->src = src_hook.next;
        crypt->src_buf = src_hook.phys_next;
        crypt->ctl_flags |= CTL_FLAG_PERFORM_ABLK;
        qmgr_put_entry(SEND_QID, crypt_virt2phys(crypt));
        BUG_ON(qmgr_stat_overflow(SEND_QID));
        return -EINPROGRESS;

free_buf_src:
        free_buf_chain(dev, req_ctx->src, crypt->src_buf);
free_buf_dest:
        if (req->src != req->dst) {
                free_buf_chain(dev, req_ctx->dst, crypt->dst_buf);
        }
        crypt->ctl_flags = CTL_FLAG_UNUSED;
        return -ENOMEM;
}

static int ablk_encrypt(struct ablkcipher_request *req)
{
        return ablk_perform(req, 1);
}

static int ablk_decrypt(struct ablkcipher_request *req)
{
        return ablk_perform(req, 0);
}

static int ablk_rfc3686_crypt(struct ablkcipher_request *req)
{
        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
        struct ixp_ctx *ctx = crypto_ablkcipher_ctx(tfm);
        u8 iv[CTR_RFC3686_BLOCK_SIZE];
        u8 *info = req->info;
        int ret;

        /* set up counter block */
        memcpy(iv, ctx->nonce, CTR_RFC3686_NONCE_SIZE);
        memcpy(iv + CTR_RFC3686_NONCE_SIZE, info, CTR_RFC3686_IV_SIZE);

        /* initialize counter portion of counter block */
        *(__be32 *)(iv + CTR_RFC3686_NONCE_SIZE + CTR_RFC3686_IV_SIZE) =
                cpu_to_be32(1);

        req->info = iv;
        ret = ablk_perform(req, 1);
        req->info = info;
        return ret;
}

static int hmac_inconsistent(struct scatterlist *sg, unsigned start,
                unsigned int nbytes)
{
        int offset = 0;

        if (!nbytes)
                return 0;

        for (;;) {
                if (start < offset + sg->length)
                        break;

                offset += sg->length;
                sg = scatterwalk_sg_next(sg);
        }
        return (start + nbytes > offset + sg->length);
}

static int aead_perform(struct aead_request *req, int encrypt,
                int cryptoffset, int eff_cryptlen, u8 *iv)
{
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
        unsigned ivsize = crypto_aead_ivsize(tfm);
        unsigned authsize = crypto_aead_authsize(tfm);
        struct ix_sa_dir *dir;
        struct crypt_ctl *crypt;
        unsigned int cryptlen;
        struct buffer_desc *buf, src_hook;
        struct aead_ctx *req_ctx = aead_request_ctx(req);
        gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
                                GFP_KERNEL : GFP_ATOMIC;

        if (qmgr_stat_full(SEND_QID))
                return -EAGAIN;
        if (atomic_read(&ctx->configuring))
                return -EAGAIN;

        if (encrypt) {
                dir = &ctx->encrypt;
                cryptlen = req->cryptlen;

        } else {
                dir = &ctx->decrypt;
                /* req->cryptlen includes the authsize when decrypting */
                cryptlen = req->cryptlen -authsize;
                eff_cryptlen -= authsize;
        }
        crypt = get_crypt_desc();
        if (!crypt)
                return -ENOMEM;

        crypt->data.aead_req = req;
        crypt->crypto_ctx = dir->npe_ctx_phys;
        crypt->mode = dir->npe_mode;
        crypt->init_len = dir->npe_ctx_idx;

        crypt->crypt_offs = cryptoffset;
        crypt->crypt_len = eff_cryptlen;

        crypt->auth_offs = 0;
        crypt->auth_len = req->assoclen + ivsize + cryptlen;
        BUG_ON(ivsize && !req->iv);
        memcpy(crypt->iv, req->iv, ivsize);

        if (req->src != req->dst) {
                BUG(); /* -ENOTSUP because of my lazyness */
        }

        /* ASSOC data */
        buf = chainup_buffers(dev, req->assoc, req->assoclen, &src_hook,
                flags, DMA_TO_DEVICE);
        req_ctx->buffer = src_hook.next;
        crypt->src_buf = src_hook.phys_next;
        if (!buf)
                goto out;
        /* IV */
        sg_init_table(&req_ctx->ivlist, 1);
        sg_set_buf(&req_ctx->ivlist, iv, ivsize);
        buf = chainup_buffers(dev, &req_ctx->ivlist, ivsize, buf, flags,
                        DMA_BIDIRECTIONAL);
        if (!buf)
                goto free_chain;
        if (unlikely(hmac_inconsistent(req->src, cryptlen, authsize))) {
                /* The 12 hmac bytes are scattered,
                 * we need to copy them into a safe buffer */
                req_ctx->hmac_virt = dma_pool_alloc(buffer_pool, flags,
                                &crypt->icv_rev_aes);
                if (unlikely(!req_ctx->hmac_virt))
                        goto free_chain;
                if (!encrypt) {
                        scatterwalk_map_and_copy(req_ctx->hmac_virt,
                                req->src, cryptlen, authsize, 0);
                }
                req_ctx->encrypt = encrypt;
        } else {
                req_ctx->hmac_virt = NULL;
        }
        /* Crypt */
        buf = chainup_buffers(dev, req->src, cryptlen + authsize, buf, flags,
                        DMA_BIDIRECTIONAL);
        if (!buf)
                goto free_hmac_virt;
        if (!req_ctx->hmac_virt) {
                crypt->icv_rev_aes = buf->phys_addr + buf->buf_len - authsize;
        }

        crypt->ctl_flags |= CTL_FLAG_PERFORM_AEAD;
        qmgr_put_entry(SEND_QID, crypt_virt2phys(crypt));
        BUG_ON(qmgr_stat_overflow(SEND_QID));
        return -EINPROGRESS;
free_hmac_virt:
        if (req_ctx->hmac_virt) {
                dma_pool_free(buffer_pool, req_ctx->hmac_virt,
                                crypt->icv_rev_aes);
        }
free_chain:
        free_buf_chain(dev, req_ctx->buffer, crypt->src_buf);
out:
        crypt->ctl_flags = CTL_FLAG_UNUSED;
        return -ENOMEM;
}

static int aead_setup(struct crypto_aead *tfm, unsigned int authsize)
{
        struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
        u32 *flags = &tfm->base.crt_flags;
        unsigned digest_len = crypto_aead_alg(tfm)->maxauthsize;
        int ret;

        if (!ctx->enckey_len && !ctx->authkey_len)
                return 0;
        init_completion(&ctx->completion);
        atomic_inc(&ctx->configuring);

        reset_sa_dir(&ctx->encrypt);
        reset_sa_dir(&ctx->decrypt);

        ret = setup_cipher(&tfm->base, 0, ctx->enckey, ctx->enckey_len);
        if (ret)
                goto out;
        ret = setup_cipher(&tfm->base, 1, ctx->enckey, ctx->enckey_len);
        if (ret)
                goto out;
        ret = setup_auth(&tfm->base, 0, authsize, ctx->authkey,
                        ctx->authkey_len, digest_len);
        if (ret)
                goto out;
        ret = setup_auth(&tfm->base, 1, authsize,  ctx->authkey,
                        ctx->authkey_len, digest_len);
        if (ret)
                goto out;

        if (*flags & CRYPTO_TFM_RES_WEAK_KEY) {
                if (*flags & CRYPTO_TFM_REQ_WEAK_KEY) {
                        ret = -EINVAL;
                        goto out;
                } else {
                        *flags &= ~CRYPTO_TFM_RES_WEAK_KEY;
                }
        }
out:
        if (!atomic_dec_and_test(&ctx->configuring))
                wait_for_completion(&ctx->completion);
        return ret;
}

static int aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
{
        int max = crypto_aead_alg(tfm)->maxauthsize >> 2;

        if ((authsize>>2) < 1 || (authsize>>2) > max || (authsize & 3))
                return -EINVAL;
        return aead_setup(tfm, authsize);
}

static int aead_setkey(struct crypto_aead *tfm, const u8 *key,
                        unsigned int keylen)
{
        struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
        struct rtattr *rta = (struct rtattr *)key;
        struct crypto_authenc_key_param *param;

        if (!RTA_OK(rta, keylen))
                goto badkey;
        if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
                goto badkey;
        if (RTA_PAYLOAD(rta) < sizeof(*param))
                goto badkey;

        param = RTA_DATA(rta);
        ctx->enckey_len = be32_to_cpu(param->enckeylen);

        key += RTA_ALIGN(rta->rta_len);
        keylen -= RTA_ALIGN(rta->rta_len);

        if (keylen < ctx->enckey_len)
                goto badkey;

        ctx->authkey_len = keylen - ctx->enckey_len;
        memcpy(ctx->enckey, key + ctx->authkey_len, ctx->enckey_len);
        memcpy(ctx->authkey, key, ctx->authkey_len);

        return aead_setup(tfm, crypto_aead_authsize(tfm));
badkey:
        ctx->enckey_len = 0;
        crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
        return -EINVAL;
}

static int aead_encrypt(struct aead_request *req)
{
        unsigned ivsize = crypto_aead_ivsize(crypto_aead_reqtfm(req));
        return aead_perform(req, 1, req->assoclen + ivsize,
                        req->cryptlen, req->iv);
}

static int aead_decrypt(struct aead_request *req)
{
        unsigned ivsize = crypto_aead_ivsize(crypto_aead_reqtfm(req));
        return aead_perform(req, 0, req->assoclen + ivsize,
                        req->cryptlen, req->iv);
}

static int aead_givencrypt(struct aead_givcrypt_request *req)
{
        struct crypto_aead *tfm = aead_givcrypt_reqtfm(req);
        struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
        unsigned len, ivsize = crypto_aead_ivsize(tfm);
        __be64 seq;

        /* copied from eseqiv.c */
        if (!ctx->salted) {
                get_random_bytes(ctx->salt, ivsize);
                ctx->salted = 1;
        }
        memcpy(req->areq.iv, ctx->salt, ivsize);
        len = ivsize;
        if (ivsize > sizeof(u64)) {
                memset(req->giv, 0, ivsize - sizeof(u64));
                len = sizeof(u64);
        }
        seq = cpu_to_be64(req->seq);
        memcpy(req->giv + ivsize - len, &seq, len);
        return aead_perform(&req->areq, 1, req->areq.assoclen,
                        req->areq.cryptlen +ivsize, req->giv);
}

static struct ixp_alg ixp4xx_algos[] = {
{
        .crypto = {
                .cra_name       = "cbc(des)",
                .cra_blocksize  = DES_BLOCK_SIZE,
                .cra_u          = { .ablkcipher = {
                        .min_keysize    = DES_KEY_SIZE,
                        .max_keysize    = DES_KEY_SIZE,
                        .ivsize         = DES_BLOCK_SIZE,
                        .geniv          = "eseqiv",
                        }
                }
        },
        .cfg_enc = CIPH_ENCR | MOD_DES | MOD_CBC_ENC | KEYLEN_192,
        .cfg_dec = CIPH_DECR | MOD_DES | MOD_CBC_DEC | KEYLEN_192,

}, {
        .crypto = {
                .cra_name       = "ecb(des)",
                .cra_blocksize  = DES_BLOCK_SIZE,
                .cra_u          = { .ablkcipher = {
                        .min_keysize    = DES_KEY_SIZE,
                        .max_keysize    = DES_KEY_SIZE,
                        }
                }
        },
        .cfg_enc = CIPH_ENCR | MOD_DES | MOD_ECB | KEYLEN_192,
        .cfg_dec = CIPH_DECR | MOD_DES | MOD_ECB | KEYLEN_192,
}, {
        .crypto = {
                .cra_name       = "cbc(des3_ede)",
                .cra_blocksize  = DES3_EDE_BLOCK_SIZE,
                .cra_u          = { .ablkcipher = {
                        .min_keysize    = DES3_EDE_KEY_SIZE,
                        .max_keysize    = DES3_EDE_KEY_SIZE,
                        .ivsize         = DES3_EDE_BLOCK_SIZE,
                        .geniv          = "eseqiv",
                        }
                }
        },
        .cfg_enc = CIPH_ENCR | MOD_3DES | MOD_CBC_ENC | KEYLEN_192,
        .cfg_dec = CIPH_DECR | MOD_3DES | MOD_CBC_DEC | KEYLEN_192,
}, {
        .crypto = {
                .cra_name       = "ecb(des3_ede)",
                .cra_blocksize  = DES3_EDE_BLOCK_SIZE,
                .cra_u          = { .ablkcipher = {
                        .min_keysize    = DES3_EDE_KEY_SIZE,
                        .max_keysize    = DES3_EDE_KEY_SIZE,
                        }
                }
        },
        .cfg_enc = CIPH_ENCR | MOD_3DES | MOD_ECB | KEYLEN_192,
        .cfg_dec = CIPH_DECR | MOD_3DES | MOD_ECB | KEYLEN_192,
}, {
        .crypto = {
                .cra_name       = "cbc(aes)",
                .cra_blocksize  = AES_BLOCK_SIZE,
                .cra_u          = { .ablkcipher = {
                        .min_keysize    = AES_MIN_KEY_SIZE,
                        .max_keysize    = AES_MAX_KEY_SIZE,
                        .ivsize         = AES_BLOCK_SIZE,
                        .geniv          = "eseqiv",
                        }
                }
        },
        .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CBC_ENC,
        .cfg_dec = CIPH_DECR | MOD_AES | MOD_CBC_DEC,
}, {
        .crypto = {
                .cra_name       = "ecb(aes)",
                .cra_blocksize  = AES_BLOCK_SIZE,
                .cra_u          = { .ablkcipher = {
                        .min_keysize    = AES_MIN_KEY_SIZE,
                        .max_keysize    = AES_MAX_KEY_SIZE,
                        }
                }
        },
        .cfg_enc = CIPH_ENCR | MOD_AES | MOD_ECB,
        .cfg_dec = CIPH_DECR | MOD_AES | MOD_ECB,
}, {
        .crypto = {
                .cra_name       = "ctr(aes)",
                .cra_blocksize  = AES_BLOCK_SIZE,
                .cra_u          = { .ablkcipher = {
                        .min_keysize    = AES_MIN_KEY_SIZE,
                        .max_keysize    = AES_MAX_KEY_SIZE,
                        .ivsize         = AES_BLOCK_SIZE,
                        .geniv          = "eseqiv",
                        }
                }
        },
        .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CTR,
        .cfg_dec = CIPH_ENCR | MOD_AES | MOD_CTR,
}, {
        .crypto = {
                .cra_name       = "rfc3686(ctr(aes))",
                .cra_blocksize  = AES_BLOCK_SIZE,
                .cra_u          = { .ablkcipher = {
                        .min_keysize    = AES_MIN_KEY_SIZE,
                        .max_keysize    = AES_MAX_KEY_SIZE,
                        .ivsize         = AES_BLOCK_SIZE,
                        .geniv          = "eseqiv",
                        .setkey         = ablk_rfc3686_setkey,
                        .encrypt        = ablk_rfc3686_crypt,
                        .decrypt        = ablk_rfc3686_crypt }
                }
        },
        .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CTR,
        .cfg_dec = CIPH_ENCR | MOD_AES | MOD_CTR,
}, {
        .crypto = {
                .cra_name       = "authenc(hmac(md5),cbc(des))",
                .cra_blocksize  = DES_BLOCK_SIZE,
                .cra_u          = { .aead = {
                        .ivsize         = DES_BLOCK_SIZE,
                        .maxauthsize    = MD5_DIGEST_SIZE,
                        }
                }
        },
        .hash = &hash_alg_md5,
        .cfg_enc = CIPH_ENCR | MOD_DES | MOD_CBC_ENC | KEYLEN_192,
        .cfg_dec = CIPH_DECR | MOD_DES | MOD_CBC_DEC | KEYLEN_192,
}, {
        .crypto = {
                .cra_name       = "authenc(hmac(md5),cbc(des3_ede))",
                .cra_blocksize  = DES3_EDE_BLOCK_SIZE,
                .cra_u          = { .aead = {
                        .ivsize         = DES3_EDE_BLOCK_SIZE,
                        .maxauthsize    = MD5_DIGEST_SIZE,
                        }
                }
        },
        .hash = &hash_alg_md5,
        .cfg_enc = CIPH_ENCR | MOD_3DES | MOD_CBC_ENC | KEYLEN_192,
        .cfg_dec = CIPH_DECR | MOD_3DES | MOD_CBC_DEC | KEYLEN_192,
}, {
        .crypto = {
                .cra_name       = "authenc(hmac(sha1),cbc(des))",
                .cra_blocksize  = DES_BLOCK_SIZE,
                .cra_u          = { .aead = {
                        .ivsize         = DES_BLOCK_SIZE,
                        .maxauthsize    = SHA1_DIGEST_SIZE,
                        }
                }
        },
        .hash = &hash_alg_sha1,
        .cfg_enc = CIPH_ENCR | MOD_DES | MOD_CBC_ENC | KEYLEN_192,
        .cfg_dec = CIPH_DECR | MOD_DES | MOD_CBC_DEC | KEYLEN_192,
}, {
        .crypto = {
                .cra_name       = "authenc(hmac(sha1),cbc(des3_ede))",
                .cra_blocksize  = DES3_EDE_BLOCK_SIZE,
                .cra_u          = { .aead = {
                        .ivsize         = DES3_EDE_BLOCK_SIZE,
                        .maxauthsize    = SHA1_DIGEST_SIZE,
                        }
                }
        },
        .hash = &hash_alg_sha1,
        .cfg_enc = CIPH_ENCR | MOD_3DES | MOD_CBC_ENC | KEYLEN_192,
        .cfg_dec = CIPH_DECR | MOD_3DES | MOD_CBC_DEC | KEYLEN_192,
}, {
        .crypto = {
                .cra_name       = "authenc(hmac(md5),cbc(aes))",
                .cra_blocksize  = AES_BLOCK_SIZE,
                .cra_u          = { .aead = {
                        .ivsize         = AES_BLOCK_SIZE,
                        .maxauthsize    = MD5_DIGEST_SIZE,
                        }
                }
        },
        .hash = &hash_alg_md5,
        .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CBC_ENC,
        .cfg_dec = CIPH_DECR | MOD_AES | MOD_CBC_DEC,
}, {
        .crypto = {
                .cra_name       = "authenc(hmac(sha1),cbc(aes))",
                .cra_blocksize  = AES_BLOCK_SIZE,
                .cra_u          = { .aead = {
                        .ivsize         = AES_BLOCK_SIZE,
                        .maxauthsize    = SHA1_DIGEST_SIZE,
                        }
                }
        },
        .hash = &hash_alg_sha1,
        .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CBC_ENC,
        .cfg_dec = CIPH_DECR | MOD_AES | MOD_CBC_DEC,
} };

#define IXP_POSTFIX "-ixp4xx"
static int __init ixp_module_init(void)
{
        int num = ARRAY_SIZE(ixp4xx_algos);
        int i,err ;

        if (platform_device_register(&pseudo_dev))
                return -ENODEV;

        spin_lock_init(&desc_lock);
        spin_lock_init(&emerg_lock);

        err = init_ixp_crypto();
        if (err) {
                platform_device_unregister(&pseudo_dev);
                return err;
        }
        for (i=0; i< num; i++) {
                struct crypto_alg *cra = &ixp4xx_algos[i].crypto;

                if (snprintf(cra->cra_driver_name, CRYPTO_MAX_ALG_NAME,
                        "%s"IXP_POSTFIX, cra->cra_name) >=
                        CRYPTO_MAX_ALG_NAME)
                {
                        continue;
                }
                if (!support_aes && (ixp4xx_algos[i].cfg_enc & MOD_AES)) {
                        continue;
                }
                if (!ixp4xx_algos[i].hash) {
                        /* block ciphers */
                        cra->cra_type = &crypto_ablkcipher_type;
                        cra->cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
                                         CRYPTO_ALG_ASYNC;
                        if (!cra->cra_ablkcipher.setkey)
                                cra->cra_ablkcipher.setkey = ablk_setkey;
                        if (!cra->cra_ablkcipher.encrypt)
                                cra->cra_ablkcipher.encrypt = ablk_encrypt;
                        if (!cra->cra_ablkcipher.decrypt)
                                cra->cra_ablkcipher.decrypt = ablk_decrypt;
                        cra->cra_init = init_tfm_ablk;
                } else {
                        /* authenc */
                        cra->cra_type = &crypto_aead_type;
                        cra->cra_flags = CRYPTO_ALG_TYPE_AEAD |
                                         CRYPTO_ALG_ASYNC;
                        cra->cra_aead.setkey = aead_setkey;
                        cra->cra_aead.setauthsize = aead_setauthsize;
                        cra->cra_aead.encrypt = aead_encrypt;
                        cra->cra_aead.decrypt = aead_decrypt;
                        cra->cra_aead.givencrypt = aead_givencrypt;
                        cra->cra_init = init_tfm_aead;
                }
                cra->cra_ctxsize = sizeof(struct ixp_ctx);
                cra->cra_module = THIS_MODULE;
                cra->cra_alignmask = 3;
                cra->cra_priority = 300;
                cra->cra_exit = exit_tfm;
                if (crypto_register_alg(cra))
                        printk(KERN_ERR "Failed to register '%s'\n",
                                cra->cra_name);
                else
                        ixp4xx_algos[i].registered = 1;
        }
        return 0;
}

static void __exit ixp_module_exit(void)
{
        int num = ARRAY_SIZE(ixp4xx_algos);
        int i;

        for (i=0; i< num; i++) {
                if (ixp4xx_algos[i].registered)
                        crypto_unregister_alg(&ixp4xx_algos[i].crypto);
        }
        release_ixp_crypto();
        platform_device_unregister(&pseudo_dev);
}

module_init(ixp_module_init);
module_exit(ixp_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Hohnstaedt <chohnstaedt@innominate.com>");
MODULE_DESCRIPTION("IXP4xx hardware crypto");