// SPDX-License-Identifier: GPL-2.0-only
/*
 * Cryptographic API.
 *
 * Support for OMAP SHA1/MD5 HW acceleration.
 *
 * Copyright (c) 2010 Nokia Corporation
 * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
 * Copyright (c) 2011 Texas Instruments Incorporated
 *
 * Some ideas are from old omap-sha1-md5.c driver.
 */

#define pr_fmt(fmt) "%s: " fmt, __func__

#include <linux/err.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/delay.h>
#include <linux/crypto.h>
#include <crypto/scatterwalk.h>
#include <crypto/algapi.h>
#include <crypto/sha1.h>
#include <crypto/sha2.h>
#include <crypto/hash.h>
#include <crypto/hmac.h>
#include <crypto/internal/hash.h>
#include <crypto/engine.h>

#define MD5_DIGEST_SIZE                 16

#define SHA_REG_IDIGEST(dd, x)          ((dd)->pdata->idigest_ofs + ((x)*0x04))
#define SHA_REG_DIN(dd, x)              ((dd)->pdata->din_ofs + ((x) * 0x04))
#define SHA_REG_DIGCNT(dd)              ((dd)->pdata->digcnt_ofs)

#define SHA_REG_ODIGEST(dd, x)          ((dd)->pdata->odigest_ofs + (x * 0x04))

#define SHA_REG_CTRL                    0x18
#define SHA_REG_CTRL_LENGTH             (0xFFFFFFFF << 5)
#define SHA_REG_CTRL_CLOSE_HASH         (1 << 4)
#define SHA_REG_CTRL_ALGO_CONST         (1 << 3)
#define SHA_REG_CTRL_ALGO               (1 << 2)
#define SHA_REG_CTRL_INPUT_READY        (1 << 1)
#define SHA_REG_CTRL_OUTPUT_READY       (1 << 0)

#define SHA_REG_REV(dd)                 ((dd)->pdata->rev_ofs)

#define SHA_REG_MASK(dd)                ((dd)->pdata->mask_ofs)
#define SHA_REG_MASK_DMA_EN             (1 << 3)
#define SHA_REG_MASK_IT_EN              (1 << 2)
#define SHA_REG_MASK_SOFTRESET          (1 << 1)
#define SHA_REG_AUTOIDLE                (1 << 0)

#define SHA_REG_SYSSTATUS(dd)           ((dd)->pdata->sysstatus_ofs)
#define SHA_REG_SYSSTATUS_RESETDONE     (1 << 0)

#define SHA_REG_MODE(dd)                ((dd)->pdata->mode_ofs)
#define SHA_REG_MODE_HMAC_OUTER_HASH    (1 << 7)
#define SHA_REG_MODE_HMAC_KEY_PROC      (1 << 5)
#define SHA_REG_MODE_CLOSE_HASH         (1 << 4)
#define SHA_REG_MODE_ALGO_CONSTANT      (1 << 3)

#define SHA_REG_MODE_ALGO_MASK          (7 << 0)
#define SHA_REG_MODE_ALGO_MD5_128       (0 << 1)
#define SHA_REG_MODE_ALGO_SHA1_160      (1 << 1)
#define SHA_REG_MODE_ALGO_SHA2_224      (2 << 1)
#define SHA_REG_MODE_ALGO_SHA2_256      (3 << 1)
#define SHA_REG_MODE_ALGO_SHA2_384      (1 << 0)
#define SHA_REG_MODE_ALGO_SHA2_512      (3 << 0)

#define SHA_REG_LENGTH(dd)              ((dd)->pdata->length_ofs)

#define SHA_REG_IRQSTATUS               0x118
#define SHA_REG_IRQSTATUS_CTX_RDY       (1 << 3)
#define SHA_REG_IRQSTATUS_PARTHASH_RDY (1 << 2)
#define SHA_REG_IRQSTATUS_INPUT_RDY     (1 << 1)
#define SHA_REG_IRQSTATUS_OUTPUT_RDY    (1 << 0)

#define SHA_REG_IRQENA                  0x11C
#define SHA_REG_IRQENA_CTX_RDY          (1 << 3)
#define SHA_REG_IRQENA_PARTHASH_RDY     (1 << 2)
#define SHA_REG_IRQENA_INPUT_RDY        (1 << 1)
#define SHA_REG_IRQENA_OUTPUT_RDY       (1 << 0)

#define DEFAULT_TIMEOUT_INTERVAL        HZ

#define DEFAULT_AUTOSUSPEND_DELAY       1000

/* mostly device flags */
#define FLAGS_FINAL             1
#define FLAGS_DMA_ACTIVE        2
#define FLAGS_OUTPUT_READY      3
#define FLAGS_CPU               5
#define FLAGS_DMA_READY         6
#define FLAGS_AUTO_XOR          7
#define FLAGS_BE32_SHA1         8
#define FLAGS_SGS_COPIED        9
#define FLAGS_SGS_ALLOCED       10
#define FLAGS_HUGE              11

/* context flags */
#define FLAGS_FINUP             16

#define FLAGS_MODE_SHIFT        18
#define FLAGS_MODE_MASK         (SHA_REG_MODE_ALGO_MASK << FLAGS_MODE_SHIFT)
#define FLAGS_MODE_MD5          (SHA_REG_MODE_ALGO_MD5_128 << FLAGS_MODE_SHIFT)
#define FLAGS_MODE_SHA1         (SHA_REG_MODE_ALGO_SHA1_160 << FLAGS_MODE_SHIFT)
#define FLAGS_MODE_SHA224       (SHA_REG_MODE_ALGO_SHA2_224 << FLAGS_MODE_SHIFT)
#define FLAGS_MODE_SHA256       (SHA_REG_MODE_ALGO_SHA2_256 << FLAGS_MODE_SHIFT)
#define FLAGS_MODE_SHA384       (SHA_REG_MODE_ALGO_SHA2_384 << FLAGS_MODE_SHIFT)
#define FLAGS_MODE_SHA512       (SHA_REG_MODE_ALGO_SHA2_512 << FLAGS_MODE_SHIFT)

#define FLAGS_HMAC              21
#define FLAGS_ERROR             22

#define OP_UPDATE               1
#define OP_FINAL                2

#define OMAP_ALIGN_MASK         (sizeof(u32)-1)
#define OMAP_ALIGNED            __attribute__((aligned(sizeof(u32))))

#define BUFLEN                  SHA512_BLOCK_SIZE
#define OMAP_SHA_DMA_THRESHOLD  256

#define OMAP_SHA_MAX_DMA_LEN    (1024 * 2048)

struct omap_sham_dev;

struct omap_sham_reqctx {
        struct omap_sham_dev    *dd;
        unsigned long           flags;
        u8                      op;

        u8                      digest[SHA512_DIGEST_SIZE] OMAP_ALIGNED;
        size_t                  digcnt;
        size_t                  bufcnt;
        size_t                  buflen;

        /* walk state */
        struct scatterlist      *sg;
        struct scatterlist      sgl[2];
        int                     offset; /* offset in current sg */
        int                     sg_len;
        unsigned int            total;  /* total request */

        u8                      buffer[] OMAP_ALIGNED;
};

struct omap_sham_hmac_ctx {
        struct crypto_shash     *shash;
        u8                      ipad[SHA512_BLOCK_SIZE] OMAP_ALIGNED;
        u8                      opad[SHA512_BLOCK_SIZE] OMAP_ALIGNED;
};

struct omap_sham_ctx {
        struct crypto_engine_ctx        enginectx;
        unsigned long           flags;

        /* fallback stuff */
        struct crypto_shash     *fallback;

        struct omap_sham_hmac_ctx base[];
};

#define OMAP_SHAM_QUEUE_LENGTH  10

struct omap_sham_algs_info {
        struct ahash_alg        *algs_list;
        unsigned int            size;
        unsigned int            registered;
};

struct omap_sham_pdata {
        struct omap_sham_algs_info      *algs_info;
        unsigned int    algs_info_size;
        unsigned long   flags;
        int             digest_size;

        void            (*copy_hash)(struct ahash_request *req, int out);
        void            (*write_ctrl)(struct omap_sham_dev *dd, size_t length,
                                      int final, int dma);
        void            (*trigger)(struct omap_sham_dev *dd, size_t length);
        int             (*poll_irq)(struct omap_sham_dev *dd);
        irqreturn_t     (*intr_hdlr)(int irq, void *dev_id);

        u32             odigest_ofs;
        u32             idigest_ofs;
        u32             din_ofs;
        u32             digcnt_ofs;
        u32             rev_ofs;
        u32             mask_ofs;
        u32             sysstatus_ofs;
        u32             mode_ofs;
        u32             length_ofs;

        u32             major_mask;
        u32             major_shift;
        u32             minor_mask;
        u32             minor_shift;
};

struct omap_sham_dev {
        struct list_head        list;
        unsigned long           phys_base;
        struct device           *dev;
        void __iomem            *io_base;
        int                     irq;
        int                     err;
        struct dma_chan         *dma_lch;
        struct tasklet_struct   done_task;
        u8                      polling_mode;
        u8                      xmit_buf[BUFLEN] OMAP_ALIGNED;

        unsigned long           flags;
        int                     fallback_sz;
        struct crypto_queue     queue;
        struct ahash_request    *req;
        struct crypto_engine    *engine;

        const struct omap_sham_pdata    *pdata;
};

struct omap_sham_drv {
        struct list_head        dev_list;
        spinlock_t              lock;
        unsigned long           flags;
};

static struct omap_sham_drv sham = {
        .dev_list = LIST_HEAD_INIT(sham.dev_list),
        .lock = __SPIN_LOCK_UNLOCKED(sham.lock),
};

static int omap_sham_enqueue(struct ahash_request *req, unsigned int op);
static void omap_sham_finish_req(struct ahash_request *req, int err);

static inline u32 omap_sham_read(struct omap_sham_dev *dd, u32 offset)
{
        return __raw_readl(dd->io_base + offset);
}

static inline void omap_sham_write(struct omap_sham_dev *dd,
                                        u32 offset, u32 value)
{
        __raw_writel(value, dd->io_base + offset);
}

static inline void omap_sham_write_mask(struct omap_sham_dev *dd, u32 address,
                                        u32 value, u32 mask)
{
        u32 val;

        val = omap_sham_read(dd, address);
        val &= ~mask;
        val |= value;
        omap_sham_write(dd, address, val);
}

static inline int omap_sham_wait(struct omap_sham_dev *dd, u32 offset, u32 bit)
{
        unsigned long timeout = jiffies + DEFAULT_TIMEOUT_INTERVAL;

        while (!(omap_sham_read(dd, offset) & bit)) {
                if (time_is_before_jiffies(timeout))
                        return -ETIMEDOUT;
        }

        return 0;
}

static void omap_sham_copy_hash_omap2(struct ahash_request *req, int out)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        struct omap_sham_dev *dd = ctx->dd;
        u32 *hash = (u32 *)ctx->digest;
        int i;

        for (i = 0; i < dd->pdata->digest_size / sizeof(u32); i++) {
                if (out)
                        hash[i] = omap_sham_read(dd, SHA_REG_IDIGEST(dd, i));
                else
                        omap_sham_write(dd, SHA_REG_IDIGEST(dd, i), hash[i]);
        }
}

static void omap_sham_copy_hash_omap4(struct ahash_request *req, int out)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        struct omap_sham_dev *dd = ctx->dd;
        int i;

        if (ctx->flags & BIT(FLAGS_HMAC)) {
                struct crypto_ahash *tfm = crypto_ahash_reqtfm(dd->req);
                struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
                struct omap_sham_hmac_ctx *bctx = tctx->base;
                u32 *opad = (u32 *)bctx->opad;

                for (i = 0; i < dd->pdata->digest_size / sizeof(u32); i++) {
                        if (out)
                                opad[i] = omap_sham_read(dd,
                                                SHA_REG_ODIGEST(dd, i));
                        else
                                omap_sham_write(dd, SHA_REG_ODIGEST(dd, i),
                                                opad[i]);
                }
        }

        omap_sham_copy_hash_omap2(req, out);
}

static void omap_sham_copy_ready_hash(struct ahash_request *req)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        u32 *in = (u32 *)ctx->digest;
        u32 *hash = (u32 *)req->result;
        int i, d, big_endian = 0;

        if (!hash)
                return;

        switch (ctx->flags & FLAGS_MODE_MASK) {
        case FLAGS_MODE_MD5:
                d = MD5_DIGEST_SIZE / sizeof(u32);
                break;
        case FLAGS_MODE_SHA1:
                /* OMAP2 SHA1 is big endian */
                if (test_bit(FLAGS_BE32_SHA1, &ctx->dd->flags))
                        big_endian = 1;
                d = SHA1_DIGEST_SIZE / sizeof(u32);
                break;
        case FLAGS_MODE_SHA224:
                d = SHA224_DIGEST_SIZE / sizeof(u32);
                break;
        case FLAGS_MODE_SHA256:
                d = SHA256_DIGEST_SIZE / sizeof(u32);
                break;
        case FLAGS_MODE_SHA384:
                d = SHA384_DIGEST_SIZE / sizeof(u32);
                break;
        case FLAGS_MODE_SHA512:
                d = SHA512_DIGEST_SIZE / sizeof(u32);
                break;
        default:
                d = 0;
        }

        if (big_endian)
                for (i = 0; i < d; i++)
                        hash[i] = be32_to_cpup((__be32 *)in + i);
        else
                for (i = 0; i < d; i++)
                        hash[i] = le32_to_cpup((__le32 *)in + i);
}

static void omap_sham_write_ctrl_omap2(struct omap_sham_dev *dd, size_t length,
                                 int final, int dma)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
        u32 val = length << 5, mask;

        if (likely(ctx->digcnt))
                omap_sham_write(dd, SHA_REG_DIGCNT(dd), ctx->digcnt);

        omap_sham_write_mask(dd, SHA_REG_MASK(dd),
                SHA_REG_MASK_IT_EN | (dma ? SHA_REG_MASK_DMA_EN : 0),
                SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
        /*
         * Setting ALGO_CONST only for the first iteration
         * and CLOSE_HASH only for the last one.
         */
        if ((ctx->flags & FLAGS_MODE_MASK) == FLAGS_MODE_SHA1)
                val |= SHA_REG_CTRL_ALGO;
        if (!ctx->digcnt)
                val |= SHA_REG_CTRL_ALGO_CONST;
        if (final)
                val |= SHA_REG_CTRL_CLOSE_HASH;

        mask = SHA_REG_CTRL_ALGO_CONST | SHA_REG_CTRL_CLOSE_HASH |
                        SHA_REG_CTRL_ALGO | SHA_REG_CTRL_LENGTH;

        omap_sham_write_mask(dd, SHA_REG_CTRL, val, mask);
}

static void omap_sham_trigger_omap2(struct omap_sham_dev *dd, size_t length)
{
}

static int omap_sham_poll_irq_omap2(struct omap_sham_dev *dd)
{
        return omap_sham_wait(dd, SHA_REG_CTRL, SHA_REG_CTRL_INPUT_READY);
}

static int get_block_size(struct omap_sham_reqctx *ctx)
{
        int d;

        switch (ctx->flags & FLAGS_MODE_MASK) {
        case FLAGS_MODE_MD5:
        case FLAGS_MODE_SHA1:
                d = SHA1_BLOCK_SIZE;
                break;
        case FLAGS_MODE_SHA224:
        case FLAGS_MODE_SHA256:
                d = SHA256_BLOCK_SIZE;
                break;
        case FLAGS_MODE_SHA384:
        case FLAGS_MODE_SHA512:
                d = SHA512_BLOCK_SIZE;
                break;
        default:
                d = 0;
        }

        return d;
}

static void omap_sham_write_n(struct omap_sham_dev *dd, u32 offset,
                                    u32 *value, int count)
{
        for (; count--; value++, offset += 4)
                omap_sham_write(dd, offset, *value);
}

static void omap_sham_write_ctrl_omap4(struct omap_sham_dev *dd, size_t length,
                                 int final, int dma)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
        u32 val, mask;

        if (likely(ctx->digcnt))
                omap_sham_write(dd, SHA_REG_DIGCNT(dd), ctx->digcnt);

        /*
         * Setting ALGO_CONST only for the first iteration and
         * CLOSE_HASH only for the last one. Note that flags mode bits
         * correspond to algorithm encoding in mode register.
         */
        val = (ctx->flags & FLAGS_MODE_MASK) >> (FLAGS_MODE_SHIFT);
        if (!ctx->digcnt) {
                struct crypto_ahash *tfm = crypto_ahash_reqtfm(dd->req);
                struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
                struct omap_sham_hmac_ctx *bctx = tctx->base;
                int bs, nr_dr;

                val |= SHA_REG_MODE_ALGO_CONSTANT;

                if (ctx->flags & BIT(FLAGS_HMAC)) {
                        bs = get_block_size(ctx);
                        nr_dr = bs / (2 * sizeof(u32));
                        val |= SHA_REG_MODE_HMAC_KEY_PROC;
                        omap_sham_write_n(dd, SHA_REG_ODIGEST(dd, 0),
                                          (u32 *)bctx->ipad, nr_dr);
                        omap_sham_write_n(dd, SHA_REG_IDIGEST(dd, 0),
                                          (u32 *)bctx->ipad + nr_dr, nr_dr);
                        ctx->digcnt += bs;
                }
        }

        if (final) {
                val |= SHA_REG_MODE_CLOSE_HASH;

                if (ctx->flags & BIT(FLAGS_HMAC))
                        val |= SHA_REG_MODE_HMAC_OUTER_HASH;
        }

        mask = SHA_REG_MODE_ALGO_CONSTANT | SHA_REG_MODE_CLOSE_HASH |
               SHA_REG_MODE_ALGO_MASK | SHA_REG_MODE_HMAC_OUTER_HASH |
               SHA_REG_MODE_HMAC_KEY_PROC;

        dev_dbg(dd->dev, "ctrl: %08x, flags: %08lx\n", val, ctx->flags);
        omap_sham_write_mask(dd, SHA_REG_MODE(dd), val, mask);
        omap_sham_write(dd, SHA_REG_IRQENA, SHA_REG_IRQENA_OUTPUT_RDY);
        omap_sham_write_mask(dd, SHA_REG_MASK(dd),
                             SHA_REG_MASK_IT_EN |
                                     (dma ? SHA_REG_MASK_DMA_EN : 0),
                             SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
}

static void omap_sham_trigger_omap4(struct omap_sham_dev *dd, size_t length)
{
        omap_sham_write(dd, SHA_REG_LENGTH(dd), length);
}

static int omap_sham_poll_irq_omap4(struct omap_sham_dev *dd)
{
        return omap_sham_wait(dd, SHA_REG_IRQSTATUS,
                              SHA_REG_IRQSTATUS_INPUT_RDY);
}

static int omap_sham_xmit_cpu(struct omap_sham_dev *dd, size_t length,
                              int final)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
        int count, len32, bs32, offset = 0;
        const u32 *buffer;
        int mlen;
        struct sg_mapping_iter mi;

        dev_dbg(dd->dev, "xmit_cpu: digcnt: %zd, length: %zd, final: %d\n",
                                                ctx->digcnt, length, final);

        dd->pdata->write_ctrl(dd, length, final, 0);
        dd->pdata->trigger(dd, length);

        /* should be non-zero before next lines to disable clocks later */
        ctx->digcnt += length;
        ctx->total -= length;

        if (final)
                set_bit(FLAGS_FINAL, &dd->flags); /* catch last interrupt */

        set_bit(FLAGS_CPU, &dd->flags);

        len32 = DIV_ROUND_UP(length, sizeof(u32));
        bs32 = get_block_size(ctx) / sizeof(u32);

        sg_miter_start(&mi, ctx->sg, ctx->sg_len,
                       SG_MITER_FROM_SG | SG_MITER_ATOMIC);

        mlen = 0;

        while (len32) {
                if (dd->pdata->poll_irq(dd))
                        return -ETIMEDOUT;

                for (count = 0; count < min(len32, bs32); count++, offset++) {
                        if (!mlen) {
                                sg_miter_next(&mi);
                                mlen = mi.length;
                                if (!mlen) {
                                        pr_err("sg miter failure.\n");
                                        return -EINVAL;
                                }
                                offset = 0;
                                buffer = mi.addr;
                        }
                        omap_sham_write(dd, SHA_REG_DIN(dd, count),
                                        buffer[offset]);
                        mlen -= 4;
                }
                len32 -= min(len32, bs32);
        }

        sg_miter_stop(&mi);

        return -EINPROGRESS;
}

static void omap_sham_dma_callback(void *param)
{
        struct omap_sham_dev *dd = param;

        set_bit(FLAGS_DMA_READY, &dd->flags);
        tasklet_schedule(&dd->done_task);
}

static int omap_sham_xmit_dma(struct omap_sham_dev *dd, size_t length,
                              int final)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
        struct dma_async_tx_descriptor *tx;
        struct dma_slave_config cfg;
        int ret;

        dev_dbg(dd->dev, "xmit_dma: digcnt: %zd, length: %zd, final: %d\n",
                                                ctx->digcnt, length, final);

        if (!dma_map_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE)) {
                dev_err(dd->dev, "dma_map_sg error\n");
                return -EINVAL;
        }

        memset(&cfg, 0, sizeof(cfg));

        cfg.dst_addr = dd->phys_base + SHA_REG_DIN(dd, 0);
        cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
        cfg.dst_maxburst = get_block_size(ctx) / DMA_SLAVE_BUSWIDTH_4_BYTES;

        ret = dmaengine_slave_config(dd->dma_lch, &cfg);
        if (ret) {
                pr_err("omap-sham: can't configure dmaengine slave: %d\n", ret);
                return ret;
        }

        tx = dmaengine_prep_slave_sg(dd->dma_lch, ctx->sg, ctx->sg_len,
                                     DMA_MEM_TO_DEV,
                                     DMA_PREP_INTERRUPT | DMA_CTRL_ACK);

        if (!tx) {
                dev_err(dd->dev, "prep_slave_sg failed\n");
                return -EINVAL;
        }

        tx->callback = omap_sham_dma_callback;
        tx->callback_param = dd;

        dd->pdata->write_ctrl(dd, length, final, 1);

        ctx->digcnt += length;
        ctx->total -= length;

        if (final)
                set_bit(FLAGS_FINAL, &dd->flags); /* catch last interrupt */

        set_bit(FLAGS_DMA_ACTIVE, &dd->flags);

        dmaengine_submit(tx);
        dma_async_issue_pending(dd->dma_lch);

        dd->pdata->trigger(dd, length);

        return -EINPROGRESS;
}

static int omap_sham_copy_sg_lists(struct omap_sham_reqctx *ctx,
                                   struct scatterlist *sg, int bs, int new_len)
{
        int n = sg_nents(sg);
        struct scatterlist *tmp;
        int offset = ctx->offset;

        ctx->total = new_len;

        if (ctx->bufcnt)
                n++;

        ctx->sg = kmalloc_array(n, sizeof(*sg), GFP_KERNEL);
        if (!ctx->sg)
                return -ENOMEM;

        sg_init_table(ctx->sg, n);

        tmp = ctx->sg;

        ctx->sg_len = 0;

        if (ctx->bufcnt) {
                sg_set_buf(tmp, ctx->dd->xmit_buf, ctx->bufcnt);
                tmp = sg_next(tmp);
                ctx->sg_len++;
                new_len -= ctx->bufcnt;
        }

        while (sg && new_len) {
                int len = sg->length - offset;

                if (len <= 0) {
                        offset -= sg->length;
                        sg = sg_next(sg);
                        continue;
                }

                if (new_len < len)
                        len = new_len;

                if (len > 0) {
                        new_len -= len;
                        sg_set_page(tmp, sg_page(sg), len, sg->offset + offset);
                        offset = 0;
                        ctx->offset = 0;
                        ctx->sg_len++;
                        if (new_len <= 0)
                                break;
                        tmp = sg_next(tmp);
                }

                sg = sg_next(sg);
        }

        if (tmp)
                sg_mark_end(tmp);

        set_bit(FLAGS_SGS_ALLOCED, &ctx->dd->flags);

        ctx->offset += new_len - ctx->bufcnt;
        ctx->bufcnt = 0;

        return 0;
}

static int omap_sham_copy_sgs(struct omap_sham_reqctx *ctx,
                              struct scatterlist *sg, int bs,
                              unsigned int new_len)
{
        int pages;
        void *buf;

        pages = get_order(new_len);

        buf = (void *)__get_free_pages(GFP_ATOMIC, pages);
        if (!buf) {
                pr_err("Couldn't allocate pages for unaligned cases.\n");
                return -ENOMEM;
        }

        if (ctx->bufcnt)
                memcpy(buf, ctx->dd->xmit_buf, ctx->bufcnt);

        scatterwalk_map_and_copy(buf + ctx->bufcnt, sg, ctx->offset,
                                 min(new_len, ctx->total) - ctx->bufcnt, 0);
        sg_init_table(ctx->sgl, 1);
        sg_set_buf(ctx->sgl, buf, new_len);
        ctx->sg = ctx->sgl;
        set_bit(FLAGS_SGS_COPIED, &ctx->dd->flags);
        ctx->sg_len = 1;
        ctx->offset += new_len - ctx->bufcnt;
        ctx->bufcnt = 0;
        ctx->total = new_len;

        return 0;
}

static int omap_sham_align_sgs(struct scatterlist *sg,
                               int nbytes, int bs, bool final,
                               struct omap_sham_reqctx *rctx)
{
        int n = 0;
        bool aligned = true;
        bool list_ok = true;
        struct scatterlist *sg_tmp = sg;
        int new_len;
        int offset = rctx->offset;
        int bufcnt = rctx->bufcnt;

        if (!sg || !sg->length || !nbytes) {
                if (bufcnt) {
                        bufcnt = DIV_ROUND_UP(bufcnt, bs) * bs;
                        sg_init_table(rctx->sgl, 1);
                        sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, bufcnt);
                        rctx->sg = rctx->sgl;
                        rctx->sg_len = 1;
                }

                return 0;
        }

        new_len = nbytes;

        if (offset)
                list_ok = false;

        if (final)
                new_len = DIV_ROUND_UP(new_len, bs) * bs;
        else
                new_len = (new_len - 1) / bs * bs;

        if (!new_len)
                return 0;

        if (nbytes != new_len)
                list_ok = false;

        while (nbytes > 0 && sg_tmp) {
                n++;

                if (bufcnt) {
                        if (!IS_ALIGNED(bufcnt, bs)) {
                                aligned = false;
                                break;
                        }
                        nbytes -= bufcnt;
                        bufcnt = 0;
                        if (!nbytes)
                                list_ok = false;

                        continue;
                }

#ifdef CONFIG_ZONE_DMA
                if (page_zonenum(sg_page(sg_tmp)) != ZONE_DMA) {
                        aligned = false;
                        break;
                }
#endif

                if (offset < sg_tmp->length) {
                        if (!IS_ALIGNED(offset + sg_tmp->offset, 4)) {
                                aligned = false;
                                break;
                        }

                        if (!IS_ALIGNED(sg_tmp->length - offset, bs)) {
                                aligned = false;
                                break;
                        }
                }

                if (offset) {
                        offset -= sg_tmp->length;
                        if (offset < 0) {
                                nbytes += offset;
                                offset = 0;
                        }
                } else {
                        nbytes -= sg_tmp->length;
                }

                sg_tmp = sg_next(sg_tmp);

                if (nbytes < 0) {
                        list_ok = false;
                        break;
                }
        }

        if (new_len > OMAP_SHA_MAX_DMA_LEN) {
                new_len = OMAP_SHA_MAX_DMA_LEN;
                aligned = false;
        }

        if (!aligned)
                return omap_sham_copy_sgs(rctx, sg, bs, new_len);
        else if (!list_ok)
                return omap_sham_copy_sg_lists(rctx, sg, bs, new_len);

        rctx->total = new_len;
        rctx->offset += new_len;
        rctx->sg_len = n;
        if (rctx->bufcnt) {
                sg_init_table(rctx->sgl, 2);
                sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, rctx->bufcnt);
                sg_chain(rctx->sgl, 2, sg);
                rctx->sg = rctx->sgl;
        } else {
                rctx->sg = sg;
        }

        return 0;
}

static int omap_sham_prepare_request(struct crypto_engine *engine, void *areq)
{
        struct ahash_request *req = container_of(areq, struct ahash_request,
                                                 base);
        struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
        int bs;
        int ret;
        unsigned int nbytes;
        bool final = rctx->flags & BIT(FLAGS_FINUP);
        bool update = rctx->op == OP_UPDATE;
        int hash_later;

        bs = get_block_size(rctx);

        nbytes = rctx->bufcnt;

        if (update)
                nbytes += req->nbytes - rctx->offset;

        dev_dbg(rctx->dd->dev,
                "%s: nbytes=%d, bs=%d, total=%d, offset=%d, bufcnt=%zd\n",
                __func__, nbytes, bs, rctx->total, rctx->offset,
                rctx->bufcnt);

        if (!nbytes)
                return 0;

        rctx->total = nbytes;

        if (update && req->nbytes && (!IS_ALIGNED(rctx->bufcnt, bs))) {
                int len = bs - rctx->bufcnt % bs;

                if (len > req->nbytes)
                        len = req->nbytes;
                scatterwalk_map_and_copy(rctx->buffer + rctx->bufcnt, req->src,
                                         0, len, 0);
                rctx->bufcnt += len;
                rctx->offset = len;
        }

        if (rctx->bufcnt)
                memcpy(rctx->dd->xmit_buf, rctx->buffer, rctx->bufcnt);

        ret = omap_sham_align_sgs(req->src, nbytes, bs, final, rctx);
        if (ret)
                return ret;

        hash_later = nbytes - rctx->total;
        if (hash_later < 0)
                hash_later = 0;

        if (hash_later && hash_later <= rctx->buflen) {
                scatterwalk_map_and_copy(rctx->buffer,
                                         req->src,
                                         req->nbytes - hash_later,
                                         hash_later, 0);

                rctx->bufcnt = hash_later;
        } else {
                rctx->bufcnt = 0;
        }

        if (hash_later > rctx->buflen)
                set_bit(FLAGS_HUGE, &rctx->dd->flags);

        rctx->total = min(nbytes, rctx->total);

        return 0;
}

static int omap_sham_update_dma_stop(struct omap_sham_dev *dd)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);

        dma_unmap_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE);

        clear_bit(FLAGS_DMA_ACTIVE, &dd->flags);

        return 0;
}

static struct omap_sham_dev *omap_sham_find_dev(struct omap_sham_reqctx *ctx)
{
        struct omap_sham_dev *dd;

        if (ctx->dd)
                return ctx->dd;

        spin_lock_bh(&sham.lock);
        dd = list_first_entry(&sham.dev_list, struct omap_sham_dev, list);
        list_move_tail(&dd->list, &sham.dev_list);
        ctx->dd = dd;
        spin_unlock_bh(&sham.lock);

        return dd;
}

static int omap_sham_init(struct ahash_request *req)
{
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
        struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        struct omap_sham_dev *dd;
        int bs = 0;

        ctx->dd = NULL;

        dd = omap_sham_find_dev(ctx);
        if (!dd)
                return -ENODEV;

        ctx->flags = 0;

        dev_dbg(dd->dev, "init: digest size: %d\n",
                crypto_ahash_digestsize(tfm));

        switch (crypto_ahash_digestsize(tfm)) {
        case MD5_DIGEST_SIZE:
                ctx->flags |= FLAGS_MODE_MD5;
                bs = SHA1_BLOCK_SIZE;
                break;
        case SHA1_DIGEST_SIZE:
                ctx->flags |= FLAGS_MODE_SHA1;
                bs = SHA1_BLOCK_SIZE;
                break;
        case SHA224_DIGEST_SIZE:
                ctx->flags |= FLAGS_MODE_SHA224;
                bs = SHA224_BLOCK_SIZE;
                break;
        case SHA256_DIGEST_SIZE:
                ctx->flags |= FLAGS_MODE_SHA256;
                bs = SHA256_BLOCK_SIZE;
                break;
        case SHA384_DIGEST_SIZE:
                ctx->flags |= FLAGS_MODE_SHA384;
                bs = SHA384_BLOCK_SIZE;
                break;
        case SHA512_DIGEST_SIZE:
                ctx->flags |= FLAGS_MODE_SHA512;
                bs = SHA512_BLOCK_SIZE;
                break;
        }

        ctx->bufcnt = 0;
        ctx->digcnt = 0;
        ctx->total = 0;
        ctx->offset = 0;
        ctx->buflen = BUFLEN;

        if (tctx->flags & BIT(FLAGS_HMAC)) {
                if (!test_bit(FLAGS_AUTO_XOR, &dd->flags)) {
                        struct omap_sham_hmac_ctx *bctx = tctx->base;

                        memcpy(ctx->buffer, bctx->ipad, bs);
                        ctx->bufcnt = bs;

                }

                ctx->flags |= BIT(FLAGS_HMAC);
        }

        return 0;

}

static int omap_sham_update_req(struct omap_sham_dev *dd)
{
        struct ahash_request *req = dd->req;
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        int err;
        bool final = (ctx->flags & BIT(FLAGS_FINUP)) &&
                !(dd->flags & BIT(FLAGS_HUGE));

        dev_dbg(dd->dev, "update_req: total: %u, digcnt: %zd, final: %d",
                ctx->total, ctx->digcnt, final);

        if (ctx->total < get_block_size(ctx) ||
            ctx->total < dd->fallback_sz)
                ctx->flags |= BIT(FLAGS_CPU);

        if (ctx->flags & BIT(FLAGS_CPU))
                err = omap_sham_xmit_cpu(dd, ctx->total, final);
        else
                err = omap_sham_xmit_dma(dd, ctx->total, final);

        /* wait for dma completion before can take more data */
        dev_dbg(dd->dev, "update: err: %d, digcnt: %zd\n", err, ctx->digcnt);

        return err;
}

static int omap_sham_final_req(struct omap_sham_dev *dd)
{
        struct ahash_request *req = dd->req;
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        int err = 0, use_dma = 1;

        if (dd->flags & BIT(FLAGS_HUGE))
                return 0;

        if ((ctx->total <= get_block_size(ctx)) || dd->polling_mode)
                /*
                 * faster to handle last block with cpu or
                 * use cpu when dma is not present.
                 */
                use_dma = 0;

        if (use_dma)
                err = omap_sham_xmit_dma(dd, ctx->total, 1);
        else
                err = omap_sham_xmit_cpu(dd, ctx->total, 1);

        ctx->bufcnt = 0;

        dev_dbg(dd->dev, "final_req: err: %d\n", err);

        return err;
}

static int omap_sham_hash_one_req(struct crypto_engine *engine, void *areq)
{
        struct ahash_request *req = container_of(areq, struct ahash_request,
                                                 base);
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        struct omap_sham_dev *dd = ctx->dd;
        int err;
        bool final = (ctx->flags & BIT(FLAGS_FINUP)) &&
                        !(dd->flags & BIT(FLAGS_HUGE));

        dev_dbg(dd->dev, "hash-one: op: %u, total: %u, digcnt: %zd, final: %d",
                ctx->op, ctx->total, ctx->digcnt, final);

        err = pm_runtime_resume_and_get(dd->dev);
        if (err < 0) {
                dev_err(dd->dev, "failed to get sync: %d\n", err);
                return err;
        }

        dd->err = 0;
        dd->req = req;

        if (ctx->digcnt)
                dd->pdata->copy_hash(req, 0);

        if (ctx->op == OP_UPDATE)
                err = omap_sham_update_req(dd);
        else if (ctx->op == OP_FINAL)
                err = omap_sham_final_req(dd);

        if (err != -EINPROGRESS)
                omap_sham_finish_req(req, err);

        return 0;
}

static int omap_sham_finish_hmac(struct ahash_request *req)
{
        struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
        struct omap_sham_hmac_ctx *bctx = tctx->base;
        int bs = crypto_shash_blocksize(bctx->shash);
        int ds = crypto_shash_digestsize(bctx->shash);
        SHASH_DESC_ON_STACK(shash, bctx->shash);

        shash->tfm = bctx->shash;

        return crypto_shash_init(shash) ?:
               crypto_shash_update(shash, bctx->opad, bs) ?:
               crypto_shash_finup(shash, req->result, ds, req->result);
}

static int omap_sham_finish(struct ahash_request *req)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        struct omap_sham_dev *dd = ctx->dd;
        int err = 0;

        if (ctx->digcnt) {
                omap_sham_copy_ready_hash(req);
                if ((ctx->flags & BIT(FLAGS_HMAC)) &&
                                !test_bit(FLAGS_AUTO_XOR, &dd->flags))
                        err = omap_sham_finish_hmac(req);
        }

        dev_dbg(dd->dev, "digcnt: %zd, bufcnt: %zd\n", ctx->digcnt, ctx->bufcnt);

        return err;
}

static void omap_sham_finish_req(struct ahash_request *req, int err)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        struct omap_sham_dev *dd = ctx->dd;

        if (test_bit(FLAGS_SGS_COPIED, &dd->flags))
                free_pages((unsigned long)sg_virt(ctx->sg),
                           get_order(ctx->sg->length));

        if (test_bit(FLAGS_SGS_ALLOCED, &dd->flags))
                kfree(ctx->sg);

        ctx->sg = NULL;

        dd->flags &= ~(BIT(FLAGS_SGS_ALLOCED) | BIT(FLAGS_SGS_COPIED) |
                       BIT(FLAGS_CPU) | BIT(FLAGS_DMA_READY) |
                       BIT(FLAGS_OUTPUT_READY));

        if (!err)
                dd->pdata->copy_hash(req, 1);

        if (dd->flags & BIT(FLAGS_HUGE)) {
                /* Re-enqueue the request */
                omap_sham_enqueue(req, ctx->op);
                return;
        }

        if (!err) {
                if (test_bit(FLAGS_FINAL, &dd->flags))
                        err = omap_sham_finish(req);
        } else {
                ctx->flags |= BIT(FLAGS_ERROR);
        }

        /* atomic operation is not needed here */
        dd->flags &= ~(BIT(FLAGS_FINAL) | BIT(FLAGS_CPU) |
                        BIT(FLAGS_DMA_READY) | BIT(FLAGS_OUTPUT_READY));

        pm_runtime_mark_last_busy(dd->dev);
        pm_runtime_put_autosuspend(dd->dev);

        ctx->offset = 0;

        crypto_finalize_hash_request(dd->engine, req, err);
}

static int omap_sham_handle_queue(struct omap_sham_dev *dd,
                                  struct ahash_request *req)
{
        return crypto_transfer_hash_request_to_engine(dd->engine, req);
}

static int omap_sham_enqueue(struct ahash_request *req, unsigned int op)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        struct omap_sham_dev *dd = ctx->dd;

        ctx->op = op;

        return omap_sham_handle_queue(dd, req);
}

static int omap_sham_update(struct ahash_request *req)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        struct omap_sham_dev *dd = omap_sham_find_dev(ctx);

        if (!req->nbytes)
                return 0;

        if (ctx->bufcnt + req->nbytes <= ctx->buflen) {
                scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, req->src,
                                         0, req->nbytes, 0);
                ctx->bufcnt += req->nbytes;
                return 0;
        }

        if (dd->polling_mode)
                ctx->flags |= BIT(FLAGS_CPU);

        return omap_sham_enqueue(req, OP_UPDATE);
}

static int omap_sham_final_shash(struct ahash_request *req)
{
        struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        int offset = 0;

        /*
         * If we are running HMAC on limited hardware support, skip
         * the ipad in the beginning of the buffer if we are going for
         * software fallback algorithm.
         */
        if (test_bit(FLAGS_HMAC, &ctx->flags) &&
            !test_bit(FLAGS_AUTO_XOR, &ctx->dd->flags))
                offset = get_block_size(ctx);

        return crypto_shash_tfm_digest(tctx->fallback, ctx->buffer + offset,
                                       ctx->bufcnt - offset, req->result);
}

static int omap_sham_final(struct ahash_request *req)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);

        ctx->flags |= BIT(FLAGS_FINUP);

        if (ctx->flags & BIT(FLAGS_ERROR))
                return 0; /* uncompleted hash is not needed */

        /*
         * OMAP HW accel works only with buffers >= 9.
         * HMAC is always >= 9 because ipad == block size.
         * If buffersize is less than fallback_sz, we use fallback
         * SW encoding, as using DMA + HW in this case doesn't provide
         * any benefit.
         */
        if (!ctx->digcnt && ctx->bufcnt < ctx->dd->fallback_sz)
                return omap_sham_final_shash(req);
        else if (ctx->bufcnt)
                return omap_sham_enqueue(req, OP_FINAL);

        /* copy ready hash (+ finalize hmac) */
        return omap_sham_finish(req);
}

static int omap_sham_finup(struct ahash_request *req)
{
        struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
        int err1, err2;

        ctx->flags |= BIT(FLAGS_FINUP);

        err1 = omap_sham_update(req);
        if (err1 == -EINPROGRESS || err1 == -EBUSY)
                return err1;
        /*
         * final() has to be always called to cleanup resources
         * even if udpate() failed, except EINPROGRESS
         */
        err2 = omap_sham_final(req);

        return err1 ?: err2;
}

static int omap_sham_digest(struct ahash_request *req)
{
        return omap_sham_init(req) ?: omap_sham_finup(req);
}

static int omap_sham_setkey(struct crypto_ahash *tfm, const u8 *key,
                      unsigned int keylen)
{
        struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
        struct omap_sham_hmac_ctx *bctx = tctx->base;
        int bs = crypto_shash_blocksize(bctx->shash);
        int ds = crypto_shash_digestsize(bctx->shash);
        int err, i;

        err = crypto_shash_setkey(tctx->fallback, key, keylen);
        if (err)
                return err;

        if (keylen > bs) {
                err = crypto_shash_tfm_digest(bctx->shash, key, keylen,
                                              bctx->ipad);
                if (err)
                        return err;
                keylen = ds;
        } else {
                memcpy(bctx->ipad, key, keylen);
        }

        memset(bctx->ipad + keylen, 0, bs - keylen);

        if (!test_bit(FLAGS_AUTO_XOR, &sham.flags)) {
                memcpy(bctx->opad, bctx->ipad, bs);

                for (i = 0; i < bs; i++) {
                        bctx->ipad[i] ^= HMAC_IPAD_VALUE;
                        bctx->opad[i] ^= HMAC_OPAD_VALUE;
                }
        }

        return err;
}

static int omap_sham_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base)
{
        struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
        const char *alg_name = crypto_tfm_alg_name(tfm);

        /* Allocate a fallback and abort if it failed. */
        tctx->fallback = crypto_alloc_shash(alg_name, 0,
                                            CRYPTO_ALG_NEED_FALLBACK);
        if (IS_ERR(tctx->fallback)) {
                pr_err("omap-sham: fallback driver '%s' "
                                "could not be loaded.\n", alg_name);
                return PTR_ERR(tctx->fallback);
        }

        crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
                                 sizeof(struct omap_sham_reqctx) + BUFLEN);

        if (alg_base) {
                struct omap_sham_hmac_ctx *bctx = tctx->base;
                tctx->flags |= BIT(FLAGS_HMAC);
                bctx->shash = crypto_alloc_shash(alg_base, 0,
                                                CRYPTO_ALG_NEED_FALLBACK);
                if (IS_ERR(bctx->shash)) {
                        pr_err("omap-sham: base driver '%s' "
                                        "could not be loaded.\n", alg_base);
                        crypto_free_shash(tctx->fallback);
                        return PTR_ERR(bctx->shash);
                }

        }

        tctx->enginectx.op.do_one_request = omap_sham_hash_one_req;
        tctx->enginectx.op.prepare_request = omap_sham_prepare_request;
        tctx->enginectx.op.unprepare_request = NULL;

        return 0;
}

static int omap_sham_cra_init(struct crypto_tfm *tfm)
{
        return omap_sham_cra_init_alg(tfm, NULL);
}

static int omap_sham_cra_sha1_init(struct crypto_tfm *tfm)
{
        return omap_sham_cra_init_alg(tfm, "sha1");
}

static int omap_sham_cra_sha224_init(struct crypto_tfm *tfm)
{
        return omap_sham_cra_init_alg(tfm, "sha224");
}

static int omap_sham_cra_sha256_init(struct crypto_tfm *tfm)
{
        return omap_sham_cra_init_alg(tfm, "sha256");
}

static int omap_sham_cra_md5_init(struct crypto_tfm *tfm)
{
        return omap_sham_cra_init_alg(tfm, "md5");
}

static int omap_sham_cra_sha384_init(struct crypto_tfm *tfm)
{
        return omap_sham_cra_init_alg(tfm, "sha384");
}

static int omap_sham_cra_sha512_init(struct crypto_tfm *tfm)
{
        return omap_sham_cra_init_alg(tfm, "sha512");
}

static void omap_sham_cra_exit(struct crypto_tfm *tfm)
{
        struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);

        crypto_free_shash(tctx->fallback);
        tctx->fallback = NULL;

        if (tctx->flags & BIT(FLAGS_HMAC)) {
                struct omap_sham_hmac_ctx *bctx = tctx->base;
                crypto_free_shash(bctx->shash);
        }
}

static int omap_sham_export(struct ahash_request *req, void *out)
{
        struct omap_sham_reqctx *rctx = ahash_request_ctx(req);

        memcpy(out, rctx, sizeof(*rctx) + rctx->bufcnt);

        return 0;
}

static int omap_sham_import(struct ahash_request *req, const void *in)
{
        struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
        const struct omap_sham_reqctx *ctx_in = in;

        memcpy(rctx, in, sizeof(*rctx) + ctx_in->bufcnt);

        return 0;
}

static struct ahash_alg algs_sha1_md5[] = {
{
        .init           = omap_sham_init,
        .update         = omap_sham_update,
        .final          = omap_sham_final,
        .finup          = omap_sham_finup,
        .digest         = omap_sham_digest,
        .halg.digestsize        = SHA1_DIGEST_SIZE,
        .halg.base      = {
                .cra_name               = "sha1",
                .cra_driver_name        = "omap-sha1",
                .cra_priority           = 400,
                .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
                                                CRYPTO_ALG_ASYNC |
                                                CRYPTO_ALG_NEED_FALLBACK,
                .cra_blocksize          = SHA1_BLOCK_SIZE,
                .cra_ctxsize            = sizeof(struct omap_sham_ctx),
                .cra_alignmask          = OMAP_ALIGN_MASK,
                .cra_module             = THIS_MODULE,
                .cra_init               = omap_sham_cra_init,
                .cra_exit               = omap_sham_cra_exit,
        }
},
{
        .init           = omap_sham_init,
        .update         = omap_sham_update,
        .final          = omap_sham_final,
        .finup          = omap_sham_finup,
        .digest         = omap_sham_digest,
        .halg.digestsize        = MD5_DIGEST_SIZE,
        .halg.base      = {
                .cra_name               = "md5",
                .cra_driver_name        = "omap-md5",
                .cra_priority           = 400,
                .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
                                                CRYPTO_ALG_ASYNC |
                                                CRYPTO_ALG_NEED_FALLBACK,
                .cra_blocksize          = SHA1_BLOCK_SIZE,
                .cra_ctxsize            = sizeof(struct omap_sham_ctx),
                .cra_alignmask          = OMAP_ALIGN_MASK,
                .cra_module             = THIS_MODULE,
                .cra_init               = omap_sham_cra_init,
                .cra_exit               = omap_sham_cra_exit,
        }
},
{
        .init           = omap_sham_init,
        .update         = omap_sham_update,
        .final          = omap_sham_final,
        .finup          = omap_sham_finup,
        .digest         = omap_sham_digest,
        .setkey         = omap_sham_setkey,
        .halg.digestsize        = SHA1_DIGEST_SIZE,
        .halg.base      = {
                .cra_name               = "hmac(sha1)",
                .cra_driver_name        = "omap-hmac-sha1",
                .cra_priority           = 400,
                .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
                                                CRYPTO_ALG_ASYNC |
                                                CRYPTO_ALG_NEED_FALLBACK,
                .cra_blocksize          = SHA1_BLOCK_SIZE,
                .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
                                        sizeof(struct omap_sham_hmac_ctx),
                .cra_alignmask          = OMAP_ALIGN_MASK,
                .cra_module             = THIS_MODULE,
                .cra_init               = omap_sham_cra_sha1_init,
                .cra_exit               = omap_sham_cra_exit,
        }
},
{
        .init           = omap_sham_init,
        .update         = omap_sham_update,
        .final          = omap_sham_final,
        .finup          = omap_sham_finup,
        .digest         = omap_sham_digest,
        .setkey         = omap_sham_setkey,
        .halg.digestsize        = MD5_DIGEST_SIZE,
        .halg.base      = {
                .cra_name               = "hmac(md5)",
                .cra_driver_name        = "omap-hmac-md5",
                .cra_priority           = 400,
                .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
                                                CRYPTO_ALG_ASYNC |
                                                CRYPTO_ALG_NEED_FALLBACK,
                .cra_blocksize          = SHA1_BLOCK_SIZE,
                .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
                                        sizeof(struct omap_sham_hmac_ctx),
                .cra_alignmask          = OMAP_ALIGN_MASK,
                .cra_module             = THIS_MODULE,
                .cra_init               = omap_sham_cra_md5_init,
                .cra_exit               = omap_sham_cra_exit,
        }
}
};

/* OMAP4 has some algs in addition to what OMAP2 has */
static struct ahash_alg algs_sha224_sha256[] = {
{
        .init           = omap_sham_init,
        .update         = omap_sham_update,
        .final          = omap_sham_final,
        .finup          = omap_sham_finup,
        .digest         = omap_sham_digest,
        .halg.digestsize        = SHA224_DIGEST_SIZE,
        .halg.base      = {
                .cra_name               = "sha224",
                .cra_driver_name        = "omap-sha224",
                .cra_priority           = 400,
                .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
                                                CRYPTO_ALG_ASYNC |
                                                CRYPTO_ALG_NEED_FALLBACK,
                .cra_blocksize          = SHA224_BLOCK_SIZE,
                .cra_ctxsize            = sizeof(struct omap_sham_ctx),
                .cra_alignmask          = OMAP_ALIGN_MASK,
                .cra_module             = THIS_MODULE,
                .cra_init               = omap_sham_cra_init,
                .cra_exit               = omap_sham_cra_exit,
        }
},
{
        .init           = omap_sham_init,
        .update         = omap_sham_update,
        .final          = omap_sham_final,
        .finup          = omap_sham_finup,
        .digest         = omap_sham_digest,
        .halg.digestsize        = SHA256_DIGEST_SIZE,
        .halg.base      = {
                .cra_name               = "sha256",
                .cra_driver_name        = "omap-sha256",
                .cra_priority           = 400,
                .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
                                                CRYPTO_ALG_ASYNC |
                                                CRYPTO_ALG_NEED_FALLBACK,
                .cra_blocksize          = SHA256_BLOCK_SIZE,
                .cra_ctxsize            = sizeof(struct omap_sham_ctx),
                .cra_alignmask          = OMAP_ALIGN_MASK,
                .cra_module             = THIS_MODULE,
                .cra_init               = omap_sham_cra_init,
                .cra_exit               = omap_sham_cra_exit,
        }
},
{
        .init           = omap_sham_init,
        .update         = omap_sham_update,
        .final          = omap_sham_final,
        .finup          = omap_sham_finup,
        .digest         = omap_sham_digest,
        .setkey         = omap_sham_setkey,
        .halg.digestsize        = SHA224_DIGEST_SIZE,
        .halg.base      = {
                .cra_name               = "hmac(sha224)",
                .cra_driver_name        = "omap-hmac-sha224",
                .cra_priority           = 400,
                .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
                                                CRYPTO_ALG_ASYNC |
                                                CRYPTO_ALG_NEED_FALLBACK,
                .cra_blocksize          = SHA224_BLOCK_SIZE,
                .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
                                        sizeof(struct omap_sham_hmac_ctx),
                .cra_alignmask          = OMAP_ALIGN_MASK,
                .cra_module             = THIS_MODULE,
                .cra_init               = omap_sham_cra_sha224_init,
                .cra_exit               = omap_sham_cra_exit,
        }
},
{
        .init           = omap_sham_init,
        .update         = omap_sham_update,
        .final          = omap_sham_final,
        .finup          = omap_sham_finup,
        .digest         = omap_sham_digest,
        .setkey         = omap_sham_setkey,
        .halg.digestsize        = SHA256_DIGEST_SIZE,
        .halg.base      = {
                .cra_name               = "hmac(sha256)",
                .cra_driver_name        = "omap-hmac-sha256",
                .cra_priority           = 400,
                .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
                                                CRYPTO_ALG_ASYNC |
                                                CRYPTO_ALG_NEED_FALLBACK,
                .cra_blocksize          = SHA256_BLOCK_SIZE,
                .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
                                        sizeof(struct omap_sham_hmac_ctx),
                .cra_alignmask          = OMAP_ALIGN_MASK,
                .cra_module             = THIS_MODULE,
                .cra_init               = omap_sham_cra_sha256_init,
                .cra_exit               = omap_sham_cra_exit,
        }
},
};

static struct ahash_alg algs_sha384_sha512[] = {
{
        .init           = omap_sham_init,
        .update         = omap_sham_update,
        .final          = omap_sham_final,
        .finup          = omap_sham_finup,
        .digest         = omap_sham_digest,
        .halg.digestsize        = SHA384_DIGEST_SIZE,
        .halg.base      = {
                .cra_name               = "sha384",
                .cra_driver_name        = "omap-sha384",
                .cra_priority           = 400,
                .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
                                                CRYPTO_ALG_ASYNC |
                                                CRYPTO_ALG_NEED_FALLBACK,
                .cra_blocksize          = SHA384_BLOCK_SIZE,
                .cra_ctxsize            = sizeof(struct omap_sham_ctx),
                .cra_alignmask          = OMAP_ALIGN_MASK,
                .cra_module             = THIS_MODULE,
                .cra_init               = omap_sham_cra_init,
                .cra_exit               = omap_sham_cra_exit,
        }
},
{
        .init           = omap_sham_init,
        .update         = omap_sham_update,
        .final          = omap_sham_final,
        .finup          = omap_sham_finup,
        .digest         = omap_sham_digest,
        .halg.digestsize        = SHA512_DIGEST_SIZE,
        .halg.base      = {
                .cra_name               = "sha512",
                .cra_driver_name        = "omap-sha512",
                .cra_priority           = 400,
                .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
                                                CRYPTO_ALG_ASYNC |
                                                CRYPTO_ALG_NEED_FALLBACK,
                .cra_blocksize          = SHA512_BLOCK_SIZE,
                .cra_ctxsize            = sizeof(struct omap_sham_ctx),
                .cra_alignmask          = OMAP_ALIGN_MASK,
                .cra_module             = THIS_MODULE,
                .cra_init               = omap_sham_cra_init,
                .cra_exit               = omap_sham_cra_exit,
        }
},
{
        .init           = omap_sham_init,
        .update         = omap_sham_update,
        .final          = omap_sham_final,
        .finup          = omap_sham_finup,
        .digest         = omap_sham_digest,
        .setkey         = omap_sham_setkey,
        .halg.digestsize        = SHA384_DIGEST_SIZE,
        .halg.base      = {
                .cra_name               = "hmac(sha384)",
                .cra_driver_name        = "omap-hmac-sha384",
                .cra_priority           = 400,
                .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
                                                CRYPTO_ALG_ASYNC |
                                                CRYPTO_ALG_NEED_FALLBACK,
                .cra_blocksize          = SHA384_BLOCK_SIZE,
                .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
                                        sizeof(struct omap_sham_hmac_ctx),
                .cra_alignmask          = OMAP_ALIGN_MASK,
                .cra_module             = THIS_MODULE,
                .cra_init               = omap_sham_cra_sha384_init,
                .cra_exit               = omap_sham_cra_exit,
        }
},
{
        .init           = omap_sham_init,
        .update         = omap_sham_update,
        .final          = omap_sham_final,
        .finup          = omap_sham_finup,
        .digest         = omap_sham_digest,
        .setkey         = omap_sham_setkey,
        .halg.digestsize        = SHA512_DIGEST_SIZE,
        .halg.base      = {
                .cra_name               = "hmac(sha512)",
                .cra_driver_name        = "omap-hmac-sha512",
                .cra_priority           = 400,
                .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
                                                CRYPTO_ALG_ASYNC |
                                                CRYPTO_ALG_NEED_FALLBACK,
                .cra_blocksize          = SHA512_BLOCK_SIZE,
                .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
                                        sizeof(struct omap_sham_hmac_ctx),
                .cra_alignmask          = OMAP_ALIGN_MASK,
                .cra_module             = THIS_MODULE,
                .cra_init               = omap_sham_cra_sha512_init,
                .cra_exit               = omap_sham_cra_exit,
        }
},
};

static void omap_sham_done_task(unsigned long data)
{
        struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
        int err = 0;

        dev_dbg(dd->dev, "%s: flags=%lx\n", __func__, dd->flags);

        if (test_bit(FLAGS_CPU, &dd->flags)) {
                if (test_and_clear_bit(FLAGS_OUTPUT_READY, &dd->flags))
                        goto finish;
        } else if (test_bit(FLAGS_DMA_READY, &dd->flags)) {
                if (test_bit(FLAGS_DMA_ACTIVE, &dd->flags)) {
                        omap_sham_update_dma_stop(dd);
                        if (dd->err) {
                                err = dd->err;
                                goto finish;
                        }
                }
                if (test_and_clear_bit(FLAGS_OUTPUT_READY, &dd->flags)) {
                        /* hash or semi-hash ready */
                        clear_bit(FLAGS_DMA_READY, &dd->flags);
                        goto finish;
                }
        }

        return;

finish:
        dev_dbg(dd->dev, "update done: err: %d\n", err);
        /* finish curent request */
        omap_sham_finish_req(dd->req, err);
}

static irqreturn_t omap_sham_irq_common(struct omap_sham_dev *dd)
{
        set_bit(FLAGS_OUTPUT_READY, &dd->flags);
        tasklet_schedule(&dd->done_task);

        return IRQ_HANDLED;
}

static irqreturn_t omap_sham_irq_omap2(int irq, void *dev_id)
{
        struct omap_sham_dev *dd = dev_id;

        if (unlikely(test_bit(FLAGS_FINAL, &dd->flags)))
                /* final -> allow device to go to power-saving mode */
                omap_sham_write_mask(dd, SHA_REG_CTRL, 0, SHA_REG_CTRL_LENGTH);

        omap_sham_write_mask(dd, SHA_REG_CTRL, SHA_REG_CTRL_OUTPUT_READY,
                                 SHA_REG_CTRL_OUTPUT_READY);
        omap_sham_read(dd, SHA_REG_CTRL);

        return omap_sham_irq_common(dd);
}

static irqreturn_t omap_sham_irq_omap4(int irq, void *dev_id)
{
        struct omap_sham_dev *dd = dev_id;

        omap_sham_write_mask(dd, SHA_REG_MASK(dd), 0, SHA_REG_MASK_IT_EN);

        return omap_sham_irq_common(dd);
}

static struct omap_sham_algs_info omap_sham_algs_info_omap2[] = {
        {
                .algs_list      = algs_sha1_md5,
                .size           = ARRAY_SIZE(algs_sha1_md5),
        },
};

static const struct omap_sham_pdata omap_sham_pdata_omap2 = {
        .algs_info      = omap_sham_algs_info_omap2,
        .algs_info_size = ARRAY_SIZE(omap_sham_algs_info_omap2),
        .flags          = BIT(FLAGS_BE32_SHA1),
        .digest_size    = SHA1_DIGEST_SIZE,
        .copy_hash      = omap_sham_copy_hash_omap2,
        .write_ctrl     = omap_sham_write_ctrl_omap2,
        .trigger        = omap_sham_trigger_omap2,
        .poll_irq       = omap_sham_poll_irq_omap2,
        .intr_hdlr      = omap_sham_irq_omap2,
        .idigest_ofs    = 0x00,
        .din_ofs        = 0x1c,
        .digcnt_ofs     = 0x14,
        .rev_ofs        = 0x5c,
        .mask_ofs       = 0x60,
        .sysstatus_ofs  = 0x64,
        .major_mask     = 0xf0,
        .major_shift    = 4,
        .minor_mask     = 0x0f,
        .minor_shift    = 0,
};

#ifdef CONFIG_OF
static struct omap_sham_algs_info omap_sham_algs_info_omap4[] = {
        {
                .algs_list      = algs_sha1_md5,
                .size           = ARRAY_SIZE(algs_sha1_md5),
        },
        {
                .algs_list      = algs_sha224_sha256,
                .size           = ARRAY_SIZE(algs_sha224_sha256),
        },
};

static const struct omap_sham_pdata omap_sham_pdata_omap4 = {
        .algs_info      = omap_sham_algs_info_omap4,
        .algs_info_size = ARRAY_SIZE(omap_sham_algs_info_omap4),
        .flags          = BIT(FLAGS_AUTO_XOR),
        .digest_size    = SHA256_DIGEST_SIZE,
        .copy_hash      = omap_sham_copy_hash_omap4,
        .write_ctrl     = omap_sham_write_ctrl_omap4,
        .trigger        = omap_sham_trigger_omap4,
        .poll_irq       = omap_sham_poll_irq_omap4,
        .intr_hdlr      = omap_sham_irq_omap4,
        .idigest_ofs    = 0x020,
        .odigest_ofs    = 0x0,
        .din_ofs        = 0x080,
        .digcnt_ofs     = 0x040,
        .rev_ofs        = 0x100,
        .mask_ofs       = 0x110,
        .sysstatus_ofs  = 0x114,
        .mode_ofs       = 0x44,
        .length_ofs     = 0x48,
        .major_mask     = 0x0700,
        .major_shift    = 8,
        .minor_mask     = 0x003f,
        .minor_shift    = 0,
};

static struct omap_sham_algs_info omap_sham_algs_info_omap5[] = {
        {
                .algs_list      = algs_sha1_md5,
                .size           = ARRAY_SIZE(algs_sha1_md5),
        },
        {
                .algs_list      = algs_sha224_sha256,
                .size           = ARRAY_SIZE(algs_sha224_sha256),
        },
        {
                .algs_list      = algs_sha384_sha512,
                .size           = ARRAY_SIZE(algs_sha384_sha512),
        },
};

static const struct omap_sham_pdata omap_sham_pdata_omap5 = {
        .algs_info      = omap_sham_algs_info_omap5,
        .algs_info_size = ARRAY_SIZE(omap_sham_algs_info_omap5),
        .flags          = BIT(FLAGS_AUTO_XOR),
        .digest_size    = SHA512_DIGEST_SIZE,
        .copy_hash      = omap_sham_copy_hash_omap4,
        .write_ctrl     = omap_sham_write_ctrl_omap4,
        .trigger        = omap_sham_trigger_omap4,
        .poll_irq       = omap_sham_poll_irq_omap4,
        .intr_hdlr      = omap_sham_irq_omap4,
        .idigest_ofs    = 0x240,
        .odigest_ofs    = 0x200,
        .din_ofs        = 0x080,
        .digcnt_ofs     = 0x280,
        .rev_ofs        = 0x100,
        .mask_ofs       = 0x110,
        .sysstatus_ofs  = 0x114,
        .mode_ofs       = 0x284,
        .length_ofs     = 0x288,
        .major_mask     = 0x0700,
        .major_shift    = 8,
        .minor_mask     = 0x003f,
        .minor_shift    = 0,
};

static const struct of_device_id omap_sham_of_match[] = {
        {
                .compatible     = "ti,omap2-sham",
                .data           = &omap_sham_pdata_omap2,
        },
        {
                .compatible     = "ti,omap3-sham",
                .data           = &omap_sham_pdata_omap2,
        },
        {
                .compatible     = "ti,omap4-sham",
                .data           = &omap_sham_pdata_omap4,
        },
        {
                .compatible     = "ti,omap5-sham",
                .data           = &omap_sham_pdata_omap5,
        },
        {},
};
MODULE_DEVICE_TABLE(of, omap_sham_of_match);

static int omap_sham_get_res_of(struct omap_sham_dev *dd,
                struct device *dev, struct resource *res)
{
        struct device_node *node = dev->of_node;
        int err = 0;

        dd->pdata = of_device_get_match_data(dev);
        if (!dd->pdata) {
                dev_err(dev, "no compatible OF match\n");
                err = -EINVAL;
                goto err;
        }

        err = of_address_to_resource(node, 0, res);
        if (err < 0) {
                dev_err(dev, "can't translate OF node address\n");
                err = -EINVAL;
                goto err;
        }

        dd->irq = irq_of_parse_and_map(node, 0);
        if (!dd->irq) {
                dev_err(dev, "can't translate OF irq value\n");
                err = -EINVAL;
                goto err;
        }

err:
        return err;
}
#else
static const struct of_device_id omap_sham_of_match[] = {
        {},
};

static int omap_sham_get_res_of(struct omap_sham_dev *dd,
                struct device *dev, struct resource *res)
{
        return -EINVAL;
}
#endif

static int omap_sham_get_res_pdev(struct omap_sham_dev *dd,
                struct platform_device *pdev, struct resource *res)
{
        struct device *dev = &pdev->dev;
        struct resource *r;
        int err = 0;

        /* Get the base address */
        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!r) {
                dev_err(dev, "no MEM resource info\n");
                err = -ENODEV;
                goto err;
        }
        memcpy(res, r, sizeof(*res));

        /* Get the IRQ */
        dd->irq = platform_get_irq(pdev, 0);
        if (dd->irq < 0) {
                err = dd->irq;
                goto err;
        }

        /* Only OMAP2/3 can be non-DT */
        dd->pdata = &omap_sham_pdata_omap2;

err:
        return err;
}

static ssize_t fallback_show(struct device *dev, struct device_attribute *attr,
                             char *buf)
{
        struct omap_sham_dev *dd = dev_get_drvdata(dev);

        return sprintf(buf, "%d\n", dd->fallback_sz);
}

static ssize_t fallback_store(struct device *dev, struct device_attribute *attr,
                              const char *buf, size_t size)
{
        struct omap_sham_dev *dd = dev_get_drvdata(dev);
        ssize_t status;
        long value;

        status = kstrtol(buf, 0, &value);
        if (status)
                return status;

        /* HW accelerator only works with buffers > 9 */
        if (value < 9) {
                dev_err(dev, "minimum fallback size 9\n");
                return -EINVAL;
        }

        dd->fallback_sz = value;

        return size;
}

static ssize_t queue_len_show(struct device *dev, struct device_attribute *attr,
                              char *buf)
{
        struct omap_sham_dev *dd = dev_get_drvdata(dev);

        return sprintf(buf, "%d\n", dd->queue.max_qlen);
}

static ssize_t queue_len_store(struct device *dev,
                               struct device_attribute *attr, const char *buf,
                               size_t size)
{
        struct omap_sham_dev *dd = dev_get_drvdata(dev);
        ssize_t status;
        long value;

        status = kstrtol(buf, 0, &value);
        if (status)
                return status;

        if (value < 1)
                return -EINVAL;

        /*
         * Changing the queue size in fly is safe, if size becomes smaller
         * than current size, it will just not accept new entries until
         * it has shrank enough.
         */
        dd->queue.max_qlen = value;

        return size;
}

static DEVICE_ATTR_RW(queue_len);
static DEVICE_ATTR_RW(fallback);

static struct attribute *omap_sham_attrs[] = {
        &dev_attr_queue_len.attr,
        &dev_attr_fallback.attr,
        NULL,
};

static struct attribute_group omap_sham_attr_group = {
        .attrs = omap_sham_attrs,
};

static int omap_sham_probe(struct platform_device *pdev)
{
        struct omap_sham_dev *dd;
        struct device *dev = &pdev->dev;
        struct resource res;
        dma_cap_mask_t mask;
        int err, i, j;
        u32 rev;

        dd = devm_kzalloc(dev, sizeof(struct omap_sham_dev), GFP_KERNEL);
        if (dd == NULL) {
                dev_err(dev, "unable to alloc data struct.\n");
                err = -ENOMEM;
                goto data_err;
        }
        dd->dev = dev;
        platform_set_drvdata(pdev, dd);

        INIT_LIST_HEAD(&dd->list);
        tasklet_init(&dd->done_task, omap_sham_done_task, (unsigned long)dd);
        crypto_init_queue(&dd->queue, OMAP_SHAM_QUEUE_LENGTH);

        err = (dev->of_node) ? omap_sham_get_res_of(dd, dev, &res) :
                               omap_sham_get_res_pdev(dd, pdev, &res);
        if (err)
                goto data_err;

        dd->io_base = devm_ioremap_resource(dev, &res);
        if (IS_ERR(dd->io_base)) {
                err = PTR_ERR(dd->io_base);
                goto data_err;
        }
        dd->phys_base = res.start;

        err = devm_request_irq(dev, dd->irq, dd->pdata->intr_hdlr,
                               IRQF_TRIGGER_NONE, dev_name(dev), dd);
        if (err) {
                dev_err(dev, "unable to request irq %d, err = %d\n",
                        dd->irq, err);
                goto data_err;
        }

        dma_cap_zero(mask);
        dma_cap_set(DMA_SLAVE, mask);

        dd->dma_lch = dma_request_chan(dev, "rx");
        if (IS_ERR(dd->dma_lch)) {
                err = PTR_ERR(dd->dma_lch);
                if (err == -EPROBE_DEFER)
                        goto data_err;

                dd->polling_mode = 1;
                dev_dbg(dev, "using polling mode instead of dma\n");
        }

        dd->flags |= dd->pdata->flags;
        sham.flags |= dd->pdata->flags;

        pm_runtime_use_autosuspend(dev);
        pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);

        dd->fallback_sz = OMAP_SHA_DMA_THRESHOLD;

        pm_runtime_enable(dev);

        err = pm_runtime_get_sync(dev);
        if (err < 0) {
                dev_err(dev, "failed to get sync: %d\n", err);
                goto err_pm;
        }

        rev = omap_sham_read(dd, SHA_REG_REV(dd));
        pm_runtime_put_sync(&pdev->dev);

        dev_info(dev, "hw accel on OMAP rev %u.%u\n",
                (rev & dd->pdata->major_mask) >> dd->pdata->major_shift,
                (rev & dd->pdata->minor_mask) >> dd->pdata->minor_shift);

        spin_lock_bh(&sham.lock);
        list_add_tail(&dd->list, &sham.dev_list);
        spin_unlock_bh(&sham.lock);

        dd->engine = crypto_engine_alloc_init(dev, 1);
        if (!dd->engine) {
                err = -ENOMEM;
                goto err_engine;
        }

        err = crypto_engine_start(dd->engine);
        if (err)
                goto err_engine_start;

        for (i = 0; i < dd->pdata->algs_info_size; i++) {
                if (dd->pdata->algs_info[i].registered)
                        break;

                for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
                        struct ahash_alg *alg;

                        alg = &dd->pdata->algs_info[i].algs_list[j];
                        alg->export = omap_sham_export;
                        alg->import = omap_sham_import;
                        alg->halg.statesize = sizeof(struct omap_sham_reqctx) +
                                              BUFLEN;
                        err = crypto_register_ahash(alg);
                        if (err)
                                goto err_algs;

                        dd->pdata->algs_info[i].registered++;
                }
        }

        err = sysfs_create_group(&dev->kobj, &omap_sham_attr_group);
        if (err) {
                dev_err(dev, "could not create sysfs device attrs\n");
                goto err_algs;
        }

        return 0;

err_algs:
        for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
                for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
                        crypto_unregister_ahash(
                                        &dd->pdata->algs_info[i].algs_list[j]);
err_engine_start:
        crypto_engine_exit(dd->engine);
err_engine:
        spin_lock_bh(&sham.lock);
        list_del(&dd->list);
        spin_unlock_bh(&sham.lock);
err_pm:
        pm_runtime_dont_use_autosuspend(dev);
        pm_runtime_disable(dev);
        if (!dd->polling_mode)
                dma_release_channel(dd->dma_lch);
data_err:
        dev_err(dev, "initialization failed.\n");

        return err;
}

static int omap_sham_remove(struct platform_device *pdev)
{
        struct omap_sham_dev *dd;
        int i, j;

        dd = platform_get_drvdata(pdev);
        if (!dd)
                return -ENODEV;
        spin_lock_bh(&sham.lock);
        list_del(&dd->list);
        spin_unlock_bh(&sham.lock);
        for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
                for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--) {
                        crypto_unregister_ahash(
                                        &dd->pdata->algs_info[i].algs_list[j]);
                        dd->pdata->algs_info[i].registered--;
                }
        tasklet_kill(&dd->done_task);
        pm_runtime_dont_use_autosuspend(&pdev->dev);
        pm_runtime_disable(&pdev->dev);

        if (!dd->polling_mode)
                dma_release_channel(dd->dma_lch);

        sysfs_remove_group(&dd->dev->kobj, &omap_sham_attr_group);

        return 0;
}

static struct platform_driver omap_sham_driver = {
        .probe  = omap_sham_probe,
        .remove = omap_sham_remove,
        .driver = {
                .name   = "omap-sham",
                .of_match_table = omap_sham_of_match,
        },
};

module_platform_driver(omap_sham_driver);

MODULE_DESCRIPTION("OMAP SHA1/MD5 hw acceleration support.");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Dmitry Kasatkin");
MODULE_ALIAS("platform:omap-sham");