/*
 * talitos - Freescale Integrated Security Engine (SEC) device driver
 *
 * Copyright (c) 2008-2011 Freescale Semiconductor, Inc.
 *
 * Scatterlist Crypto API glue code copied from files with the following:
 * Copyright (c) 2006-2007 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * Crypto algorithm registration code copied from hifn driver:
 * 2007+ Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/crypto.h>
#include <linux/hw_random.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>

#include <crypto/algapi.h>
#include <crypto/aes.h>
#include <crypto/des.h>
#include <crypto/sha.h>
#include <crypto/md5.h>
#include <crypto/internal/aead.h>
#include <crypto/authenc.h>
#include <crypto/skcipher.h>
#include <crypto/hash.h>
#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>

#include "talitos.h"

static void to_talitos_ptr(struct talitos_ptr *ptr, dma_addr_t dma_addr,
                           bool is_sec1)
{
        ptr->ptr = cpu_to_be32(lower_32_bits(dma_addr));
        if (!is_sec1)
                ptr->eptr = upper_32_bits(dma_addr);
}

static void copy_talitos_ptr(struct talitos_ptr *dst_ptr,
                             struct talitos_ptr *src_ptr, bool is_sec1)
{
        dst_ptr->ptr = src_ptr->ptr;
        if (!is_sec1)
                dst_ptr->eptr = src_ptr->eptr;
}

static void to_talitos_ptr_len(struct talitos_ptr *ptr, unsigned int len,
                               bool is_sec1)
{
        if (is_sec1) {
                ptr->res = 0;
                ptr->len1 = cpu_to_be16(len);
        } else {
                ptr->len = cpu_to_be16(len);
        }
}

static unsigned short from_talitos_ptr_len(struct talitos_ptr *ptr,
                                           bool is_sec1)
{
        if (is_sec1)
                return be16_to_cpu(ptr->len1);
        else
                return be16_to_cpu(ptr->len);
}

static void to_talitos_ptr_extent_clear(struct talitos_ptr *ptr, bool is_sec1)
{
        if (!is_sec1)
                ptr->j_extent = 0;
}

/*
 * map virtual single (contiguous) pointer to h/w descriptor pointer
 */
static void map_single_talitos_ptr(struct device *dev,
                                   struct talitos_ptr *ptr,
                                   unsigned int len, void *data,
                                   enum dma_data_direction dir)
{
        dma_addr_t dma_addr = dma_map_single(dev, data, len, dir);
        struct talitos_private *priv = dev_get_drvdata(dev);
        bool is_sec1 = has_ftr_sec1(priv);

        to_talitos_ptr_len(ptr, len, is_sec1);
        to_talitos_ptr(ptr, dma_addr, is_sec1);
        to_talitos_ptr_extent_clear(ptr, is_sec1);
}

/*
 * unmap bus single (contiguous) h/w descriptor pointer
 */
static void unmap_single_talitos_ptr(struct device *dev,
                                     struct talitos_ptr *ptr,
                                     enum dma_data_direction dir)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        bool is_sec1 = has_ftr_sec1(priv);

        dma_unmap_single(dev, be32_to_cpu(ptr->ptr),
                         from_talitos_ptr_len(ptr, is_sec1), dir);
}

static int reset_channel(struct device *dev, int ch)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        unsigned int timeout = TALITOS_TIMEOUT;
        bool is_sec1 = has_ftr_sec1(priv);

        if (is_sec1) {
                setbits32(priv->chan[ch].reg + TALITOS_CCCR_LO,
                          TALITOS1_CCCR_LO_RESET);

                while ((in_be32(priv->chan[ch].reg + TALITOS_CCCR_LO) &
                        TALITOS1_CCCR_LO_RESET) && --timeout)
                        cpu_relax();
        } else {
                setbits32(priv->chan[ch].reg + TALITOS_CCCR,
                          TALITOS2_CCCR_RESET);

                while ((in_be32(priv->chan[ch].reg + TALITOS_CCCR) &
                        TALITOS2_CCCR_RESET) && --timeout)
                        cpu_relax();
        }

        if (timeout == 0) {
                dev_err(dev, "failed to reset channel %d\n", ch);
                return -EIO;
        }

        /* set 36-bit addressing, done writeback enable and done IRQ enable */
        setbits32(priv->chan[ch].reg + TALITOS_CCCR_LO, TALITOS_CCCR_LO_EAE |
                  TALITOS_CCCR_LO_CDWE | TALITOS_CCCR_LO_CDIE);

        /* and ICCR writeback, if available */
        if (priv->features & TALITOS_FTR_HW_AUTH_CHECK)
                setbits32(priv->chan[ch].reg + TALITOS_CCCR_LO,
                          TALITOS_CCCR_LO_IWSE);

        return 0;
}

static int reset_device(struct device *dev)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        unsigned int timeout = TALITOS_TIMEOUT;
        bool is_sec1 = has_ftr_sec1(priv);
        u32 mcr = is_sec1 ? TALITOS1_MCR_SWR : TALITOS2_MCR_SWR;

        setbits32(priv->reg + TALITOS_MCR, mcr);

        while ((in_be32(priv->reg + TALITOS_MCR) & mcr)
               && --timeout)
                cpu_relax();

        if (priv->irq[1]) {
                mcr = TALITOS_MCR_RCA1 | TALITOS_MCR_RCA3;
                setbits32(priv->reg + TALITOS_MCR, mcr);
        }

        if (timeout == 0) {
                dev_err(dev, "failed to reset device\n");
                return -EIO;
        }

        return 0;
}

/*
 * Reset and initialize the device
 */
static int init_device(struct device *dev)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        int ch, err;
        bool is_sec1 = has_ftr_sec1(priv);

        /*
         * Master reset
         * errata documentation: warning: certain SEC interrupts
         * are not fully cleared by writing the MCR:SWR bit,
         * set bit twice to completely reset
         */
        err = reset_device(dev);
        if (err)
                return err;

        err = reset_device(dev);
        if (err)
                return err;

        /* reset channels */
        for (ch = 0; ch < priv->num_channels; ch++) {
                err = reset_channel(dev, ch);
                if (err)
                        return err;
        }

        /* enable channel done and error interrupts */
        if (is_sec1) {
                clrbits32(priv->reg + TALITOS_IMR, TALITOS1_IMR_INIT);
                clrbits32(priv->reg + TALITOS_IMR_LO, TALITOS1_IMR_LO_INIT);
                /* disable parity error check in DEU (erroneous? test vect.) */
                setbits32(priv->reg_deu + TALITOS_EUICR, TALITOS1_DEUICR_KPE);
        } else {
                setbits32(priv->reg + TALITOS_IMR, TALITOS2_IMR_INIT);
                setbits32(priv->reg + TALITOS_IMR_LO, TALITOS2_IMR_LO_INIT);
        }

        /* disable integrity check error interrupts (use writeback instead) */
        if (priv->features & TALITOS_FTR_HW_AUTH_CHECK)
                setbits32(priv->reg_mdeu + TALITOS_EUICR_LO,
                          TALITOS_MDEUICR_LO_ICE);

        return 0;
}

/**
 * talitos_submit - submits a descriptor to the device for processing
 * @dev:        the SEC device to be used
 * @ch:         the SEC device channel to be used
 * @desc:       the descriptor to be processed by the device
 * @callback:   whom to call when processing is complete
 * @context:    a handle for use by caller (optional)
 *
 * desc must contain valid dma-mapped (bus physical) address pointers.
 * callback must check err and feedback in descriptor header
 * for device processing status.
 */
int talitos_submit(struct device *dev, int ch, struct talitos_desc *desc,
                   void (*callback)(struct device *dev,
                                    struct talitos_desc *desc,
                                    void *context, int error),
                   void *context)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        struct talitos_request *request;
        unsigned long flags;
        int head;
        bool is_sec1 = has_ftr_sec1(priv);

        spin_lock_irqsave(&priv->chan[ch].head_lock, flags);

        if (!atomic_inc_not_zero(&priv->chan[ch].submit_count)) {
                /* h/w fifo is full */
                spin_unlock_irqrestore(&priv->chan[ch].head_lock, flags);
                return -EAGAIN;
        }

        head = priv->chan[ch].head;
        request = &priv->chan[ch].fifo[head];

        /* map descriptor and save caller data */
        if (is_sec1) {
                desc->hdr1 = desc->hdr;
                desc->next_desc = 0;
                request->dma_desc = dma_map_single(dev, &desc->hdr1,
                                                   TALITOS_DESC_SIZE,
                                                   DMA_BIDIRECTIONAL);
        } else {
                request->dma_desc = dma_map_single(dev, desc,
                                                   TALITOS_DESC_SIZE,
                                                   DMA_BIDIRECTIONAL);
        }
        request->callback = callback;
        request->context = context;

        /* increment fifo head */
        priv->chan[ch].head = (priv->chan[ch].head + 1) & (priv->fifo_len - 1);

        smp_wmb();
        request->desc = desc;

        /* GO! */
        wmb();
        out_be32(priv->chan[ch].reg + TALITOS_FF,
                 upper_32_bits(request->dma_desc));
        out_be32(priv->chan[ch].reg + TALITOS_FF_LO,
                 lower_32_bits(request->dma_desc));

        spin_unlock_irqrestore(&priv->chan[ch].head_lock, flags);

        return -EINPROGRESS;
}
EXPORT_SYMBOL(talitos_submit);

/*
 * process what was done, notify callback of error if not
 */
static void flush_channel(struct device *dev, int ch, int error, int reset_ch)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        struct talitos_request *request, saved_req;
        unsigned long flags;
        int tail, status;
        bool is_sec1 = has_ftr_sec1(priv);

        spin_lock_irqsave(&priv->chan[ch].tail_lock, flags);

        tail = priv->chan[ch].tail;
        while (priv->chan[ch].fifo[tail].desc) {
                __be32 hdr;

                request = &priv->chan[ch].fifo[tail];

                /* descriptors with their done bits set don't get the error */
                rmb();
                hdr = is_sec1 ? request->desc->hdr1 : request->desc->hdr;

                if ((hdr & DESC_HDR_DONE) == DESC_HDR_DONE)
                        status = 0;
                else
                        if (!error)
                                break;
                        else
                                status = error;

                dma_unmap_single(dev, request->dma_desc,
                                 TALITOS_DESC_SIZE,
                                 DMA_BIDIRECTIONAL);

                /* copy entries so we can call callback outside lock */
                saved_req.desc = request->desc;
                saved_req.callback = request->callback;
                saved_req.context = request->context;

                /* release request entry in fifo */
                smp_wmb();
                request->desc = NULL;

                /* increment fifo tail */
                priv->chan[ch].tail = (tail + 1) & (priv->fifo_len - 1);

                spin_unlock_irqrestore(&priv->chan[ch].tail_lock, flags);

                atomic_dec(&priv->chan[ch].submit_count);

                saved_req.callback(dev, saved_req.desc, saved_req.context,
                                   status);
                /* channel may resume processing in single desc error case */
                if (error && !reset_ch && status == error)
                        return;
                spin_lock_irqsave(&priv->chan[ch].tail_lock, flags);
                tail = priv->chan[ch].tail;
        }

        spin_unlock_irqrestore(&priv->chan[ch].tail_lock, flags);
}

/*
 * process completed requests for channels that have done status
 */
#define DEF_TALITOS1_DONE(name, ch_done_mask)                           \
static void talitos1_done_##name(unsigned long data)                    \
{                                                                       \
        struct device *dev = (struct device *)data;                     \
        struct talitos_private *priv = dev_get_drvdata(dev);            \
        unsigned long flags;                                            \
                                                                        \
        if (ch_done_mask & 0x10000000)                                  \
                flush_channel(dev, 0, 0, 0);                    \
        if (priv->num_channels == 1)                                    \
                goto out;                                               \
        if (ch_done_mask & 0x40000000)                                  \
                flush_channel(dev, 1, 0, 0);                    \
        if (ch_done_mask & 0x00010000)                                  \
                flush_channel(dev, 2, 0, 0);                    \
        if (ch_done_mask & 0x00040000)                                  \
                flush_channel(dev, 3, 0, 0);                    \
                                                                        \
out:                                                                    \
        /* At this point, all completed channels have been processed */ \
        /* Unmask done interrupts for channels completed later on. */   \
        spin_lock_irqsave(&priv->reg_lock, flags);                      \
        clrbits32(priv->reg + TALITOS_IMR, ch_done_mask);               \
        clrbits32(priv->reg + TALITOS_IMR_LO, TALITOS1_IMR_LO_INIT);    \
        spin_unlock_irqrestore(&priv->reg_lock, flags);                 \
}

DEF_TALITOS1_DONE(4ch, TALITOS1_ISR_4CHDONE)

#define DEF_TALITOS2_DONE(name, ch_done_mask)                           \
static void talitos2_done_##name(unsigned long data)                    \
{                                                                       \
        struct device *dev = (struct device *)data;                     \
        struct talitos_private *priv = dev_get_drvdata(dev);            \
        unsigned long flags;                                            \
                                                                        \
        if (ch_done_mask & 1)                                           \
                flush_channel(dev, 0, 0, 0);                            \
        if (priv->num_channels == 1)                                    \
                goto out;                                               \
        if (ch_done_mask & (1 << 2))                                    \
                flush_channel(dev, 1, 0, 0);                            \
        if (ch_done_mask & (1 << 4))                                    \
                flush_channel(dev, 2, 0, 0);                            \
        if (ch_done_mask & (1 << 6))                                    \
                flush_channel(dev, 3, 0, 0);                            \
                                                                        \
out:                                                                    \
        /* At this point, all completed channels have been processed */ \
        /* Unmask done interrupts for channels completed later on. */   \
        spin_lock_irqsave(&priv->reg_lock, flags);                      \
        setbits32(priv->reg + TALITOS_IMR, ch_done_mask);               \
        setbits32(priv->reg + TALITOS_IMR_LO, TALITOS2_IMR_LO_INIT);    \
        spin_unlock_irqrestore(&priv->reg_lock, flags);                 \
}

DEF_TALITOS2_DONE(4ch, TALITOS2_ISR_4CHDONE)
DEF_TALITOS2_DONE(ch0_2, TALITOS2_ISR_CH_0_2_DONE)
DEF_TALITOS2_DONE(ch1_3, TALITOS2_ISR_CH_1_3_DONE)

/*
 * locate current (offending) descriptor
 */
static u32 current_desc_hdr(struct device *dev, int ch)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        int tail, iter;
        dma_addr_t cur_desc;

        cur_desc = ((u64)in_be32(priv->chan[ch].reg + TALITOS_CDPR)) << 32;
        cur_desc |= in_be32(priv->chan[ch].reg + TALITOS_CDPR_LO);

        if (!cur_desc) {
                dev_err(dev, "CDPR is NULL, giving up search for offending descriptor\n");
                return 0;
        }

        tail = priv->chan[ch].tail;

        iter = tail;
        while (priv->chan[ch].fifo[iter].dma_desc != cur_desc) {
                iter = (iter + 1) & (priv->fifo_len - 1);
                if (iter == tail) {
                        dev_err(dev, "couldn't locate current descriptor\n");
                        return 0;
                }
        }

        return priv->chan[ch].fifo[iter].desc->hdr;
}

/*
 * user diagnostics; report root cause of error based on execution unit status
 */
static void report_eu_error(struct device *dev, int ch, u32 desc_hdr)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        int i;

        if (!desc_hdr)
                desc_hdr = in_be32(priv->chan[ch].reg + TALITOS_DESCBUF);

        switch (desc_hdr & DESC_HDR_SEL0_MASK) {
        case DESC_HDR_SEL0_AFEU:
                dev_err(dev, "AFEUISR 0x%08x_%08x\n",
                        in_be32(priv->reg_afeu + TALITOS_EUISR),
                        in_be32(priv->reg_afeu + TALITOS_EUISR_LO));
                break;
        case DESC_HDR_SEL0_DEU:
                dev_err(dev, "DEUISR 0x%08x_%08x\n",
                        in_be32(priv->reg_deu + TALITOS_EUISR),
                        in_be32(priv->reg_deu + TALITOS_EUISR_LO));
                break;
        case DESC_HDR_SEL0_MDEUA:
        case DESC_HDR_SEL0_MDEUB:
                dev_err(dev, "MDEUISR 0x%08x_%08x\n",
                        in_be32(priv->reg_mdeu + TALITOS_EUISR),
                        in_be32(priv->reg_mdeu + TALITOS_EUISR_LO));
                break;
        case DESC_HDR_SEL0_RNG:
                dev_err(dev, "RNGUISR 0x%08x_%08x\n",
                        in_be32(priv->reg_rngu + TALITOS_ISR),
                        in_be32(priv->reg_rngu + TALITOS_ISR_LO));
                break;
        case DESC_HDR_SEL0_PKEU:
                dev_err(dev, "PKEUISR 0x%08x_%08x\n",
                        in_be32(priv->reg_pkeu + TALITOS_EUISR),
                        in_be32(priv->reg_pkeu + TALITOS_EUISR_LO));
                break;
        case DESC_HDR_SEL0_AESU:
                dev_err(dev, "AESUISR 0x%08x_%08x\n",
                        in_be32(priv->reg_aesu + TALITOS_EUISR),
                        in_be32(priv->reg_aesu + TALITOS_EUISR_LO));
                break;
        case DESC_HDR_SEL0_CRCU:
                dev_err(dev, "CRCUISR 0x%08x_%08x\n",
                        in_be32(priv->reg_crcu + TALITOS_EUISR),
                        in_be32(priv->reg_crcu + TALITOS_EUISR_LO));
                break;
        case DESC_HDR_SEL0_KEU:
                dev_err(dev, "KEUISR 0x%08x_%08x\n",
                        in_be32(priv->reg_pkeu + TALITOS_EUISR),
                        in_be32(priv->reg_pkeu + TALITOS_EUISR_LO));
                break;
        }

        switch (desc_hdr & DESC_HDR_SEL1_MASK) {
        case DESC_HDR_SEL1_MDEUA:
        case DESC_HDR_SEL1_MDEUB:
                dev_err(dev, "MDEUISR 0x%08x_%08x\n",
                        in_be32(priv->reg_mdeu + TALITOS_EUISR),
                        in_be32(priv->reg_mdeu + TALITOS_EUISR_LO));
                break;
        case DESC_HDR_SEL1_CRCU:
                dev_err(dev, "CRCUISR 0x%08x_%08x\n",
                        in_be32(priv->reg_crcu + TALITOS_EUISR),
                        in_be32(priv->reg_crcu + TALITOS_EUISR_LO));
                break;
        }

        for (i = 0; i < 8; i++)
                dev_err(dev, "DESCBUF 0x%08x_%08x\n",
                        in_be32(priv->chan[ch].reg + TALITOS_DESCBUF + 8*i),
                        in_be32(priv->chan[ch].reg + TALITOS_DESCBUF_LO + 8*i));
}

/*
 * recover from error interrupts
 */
static void talitos_error(struct device *dev, u32 isr, u32 isr_lo)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        unsigned int timeout = TALITOS_TIMEOUT;
        int ch, error, reset_dev = 0;
        u32 v_lo;
        bool is_sec1 = has_ftr_sec1(priv);
        int reset_ch = is_sec1 ? 1 : 0; /* only SEC2 supports continuation */

        for (ch = 0; ch < priv->num_channels; ch++) {
                /* skip channels without errors */
                if (is_sec1) {
                        /* bits 29, 31, 17, 19 */
                        if (!(isr & (1 << (29 + (ch & 1) * 2 - (ch & 2) * 6))))
                                continue;
                } else {
                        if (!(isr & (1 << (ch * 2 + 1))))
                                continue;
                }

                error = -EINVAL;

                v_lo = in_be32(priv->chan[ch].reg + TALITOS_CCPSR_LO);

                if (v_lo & TALITOS_CCPSR_LO_DOF) {
                        dev_err(dev, "double fetch fifo overflow error\n");
                        error = -EAGAIN;
                        reset_ch = 1;
                }
                if (v_lo & TALITOS_CCPSR_LO_SOF) {
                        /* h/w dropped descriptor */
                        dev_err(dev, "single fetch fifo overflow error\n");
                        error = -EAGAIN;
                }
                if (v_lo & TALITOS_CCPSR_LO_MDTE)
                        dev_err(dev, "master data transfer error\n");
                if (v_lo & TALITOS_CCPSR_LO_SGDLZ)
                        dev_err(dev, is_sec1 ? "pointeur not complete error\n"
                                             : "s/g data length zero error\n");
                if (v_lo & TALITOS_CCPSR_LO_FPZ)
                        dev_err(dev, is_sec1 ? "parity error\n"
                                             : "fetch pointer zero error\n");
                if (v_lo & TALITOS_CCPSR_LO_IDH)
                        dev_err(dev, "illegal descriptor header error\n");
                if (v_lo & TALITOS_CCPSR_LO_IEU)
                        dev_err(dev, is_sec1 ? "static assignment error\n"
                                             : "invalid exec unit error\n");
                if (v_lo & TALITOS_CCPSR_LO_EU)
                        report_eu_error(dev, ch, current_desc_hdr(dev, ch));
                if (!is_sec1) {
                        if (v_lo & TALITOS_CCPSR_LO_GB)
                                dev_err(dev, "gather boundary error\n");
                        if (v_lo & TALITOS_CCPSR_LO_GRL)
                                dev_err(dev, "gather return/length error\n");
                        if (v_lo & TALITOS_CCPSR_LO_SB)
                                dev_err(dev, "scatter boundary error\n");
                        if (v_lo & TALITOS_CCPSR_LO_SRL)
                                dev_err(dev, "scatter return/length error\n");
                }

                flush_channel(dev, ch, error, reset_ch);

                if (reset_ch) {
                        reset_channel(dev, ch);
                } else {
                        setbits32(priv->chan[ch].reg + TALITOS_CCCR,
                                  TALITOS2_CCCR_CONT);
                        setbits32(priv->chan[ch].reg + TALITOS_CCCR_LO, 0);
                        while ((in_be32(priv->chan[ch].reg + TALITOS_CCCR) &
                               TALITOS2_CCCR_CONT) && --timeout)
                                cpu_relax();
                        if (timeout == 0) {
                                dev_err(dev, "failed to restart channel %d\n",
                                        ch);
                                reset_dev = 1;
                        }
                }
        }
        if (reset_dev || (is_sec1 && isr & ~TALITOS1_ISR_4CHERR) ||
            (!is_sec1 && isr & ~TALITOS2_ISR_4CHERR) || isr_lo) {
                if (is_sec1 && (isr_lo & TALITOS1_ISR_TEA_ERR))
                        dev_err(dev, "TEA error: ISR 0x%08x_%08x\n",
                                isr, isr_lo);
                else
                        dev_err(dev, "done overflow, internal time out, or "
                                "rngu error: ISR 0x%08x_%08x\n", isr, isr_lo);

                /* purge request queues */
                for (ch = 0; ch < priv->num_channels; ch++)
                        flush_channel(dev, ch, -EIO, 1);

                /* reset and reinitialize the device */
                init_device(dev);
        }
}

#define DEF_TALITOS1_INTERRUPT(name, ch_done_mask, ch_err_mask, tlet)          \
static irqreturn_t talitos1_interrupt_##name(int irq, void *data)              \
{                                                                              \
        struct device *dev = data;                                             \
        struct talitos_private *priv = dev_get_drvdata(dev);                   \
        u32 isr, isr_lo;                                                       \
        unsigned long flags;                                                   \
                                                                               \
        spin_lock_irqsave(&priv->reg_lock, flags);                             \
        isr = in_be32(priv->reg + TALITOS_ISR);                                \
        isr_lo = in_be32(priv->reg + TALITOS_ISR_LO);                          \
        /* Acknowledge interrupt */                                            \
        out_be32(priv->reg + TALITOS_ICR, isr & (ch_done_mask | ch_err_mask)); \
        out_be32(priv->reg + TALITOS_ICR_LO, isr_lo);                          \
                                                                               \
        if (unlikely(isr & ch_err_mask || isr_lo & TALITOS1_IMR_LO_INIT)) {    \
                spin_unlock_irqrestore(&priv->reg_lock, flags);                \
                talitos_error(dev, isr & ch_err_mask, isr_lo);                 \
        }                                                                      \
        else {                                                                 \
                if (likely(isr & ch_done_mask)) {                              \
                        /* mask further done interrupts. */                    \
                        setbits32(priv->reg + TALITOS_IMR, ch_done_mask);      \
                        /* done_task will unmask done interrupts at exit */    \
                        tasklet_schedule(&priv->done_task[tlet]);              \
                }                                                              \
                spin_unlock_irqrestore(&priv->reg_lock, flags);                \
        }                                                                      \
                                                                               \
        return (isr & (ch_done_mask | ch_err_mask) || isr_lo) ? IRQ_HANDLED :  \
                                                                IRQ_NONE;      \
}

DEF_TALITOS1_INTERRUPT(4ch, TALITOS1_ISR_4CHDONE, TALITOS1_ISR_4CHERR, 0)

#define DEF_TALITOS2_INTERRUPT(name, ch_done_mask, ch_err_mask, tlet)          \
static irqreturn_t talitos2_interrupt_##name(int irq, void *data)              \
{                                                                              \
        struct device *dev = data;                                             \
        struct talitos_private *priv = dev_get_drvdata(dev);                   \
        u32 isr, isr_lo;                                                       \
        unsigned long flags;                                                   \
                                                                               \
        spin_lock_irqsave(&priv->reg_lock, flags);                             \
        isr = in_be32(priv->reg + TALITOS_ISR);                                \
        isr_lo = in_be32(priv->reg + TALITOS_ISR_LO);                          \
        /* Acknowledge interrupt */                                            \
        out_be32(priv->reg + TALITOS_ICR, isr & (ch_done_mask | ch_err_mask)); \
        out_be32(priv->reg + TALITOS_ICR_LO, isr_lo);                          \
                                                                               \
        if (unlikely(isr & ch_err_mask || isr_lo)) {                           \
                spin_unlock_irqrestore(&priv->reg_lock, flags);                \
                talitos_error(dev, isr & ch_err_mask, isr_lo);                 \
        }                                                                      \
        else {                                                                 \
                if (likely(isr & ch_done_mask)) {                              \
                        /* mask further done interrupts. */                    \
                        clrbits32(priv->reg + TALITOS_IMR, ch_done_mask);      \
                        /* done_task will unmask done interrupts at exit */    \
                        tasklet_schedule(&priv->done_task[tlet]);              \
                }                                                              \
                spin_unlock_irqrestore(&priv->reg_lock, flags);                \
        }                                                                      \
                                                                               \
        return (isr & (ch_done_mask | ch_err_mask) || isr_lo) ? IRQ_HANDLED :  \
                                                                IRQ_NONE;      \
}

DEF_TALITOS2_INTERRUPT(4ch, TALITOS2_ISR_4CHDONE, TALITOS2_ISR_4CHERR, 0)
DEF_TALITOS2_INTERRUPT(ch0_2, TALITOS2_ISR_CH_0_2_DONE, TALITOS2_ISR_CH_0_2_ERR,
                       0)
DEF_TALITOS2_INTERRUPT(ch1_3, TALITOS2_ISR_CH_1_3_DONE, TALITOS2_ISR_CH_1_3_ERR,
                       1)

/*
 * hwrng
 */
static int talitos_rng_data_present(struct hwrng *rng, int wait)
{
        struct device *dev = (struct device *)rng->priv;
        struct talitos_private *priv = dev_get_drvdata(dev);
        u32 ofl;
        int i;

        for (i = 0; i < 20; i++) {
                ofl = in_be32(priv->reg_rngu + TALITOS_EUSR_LO) &
                      TALITOS_RNGUSR_LO_OFL;
                if (ofl || !wait)
                        break;
                udelay(10);
        }

        return !!ofl;
}

static int talitos_rng_data_read(struct hwrng *rng, u32 *data)
{
        struct device *dev = (struct device *)rng->priv;
        struct talitos_private *priv = dev_get_drvdata(dev);

        /* rng fifo requires 64-bit accesses */
        *data = in_be32(priv->reg_rngu + TALITOS_EU_FIFO);
        *data = in_be32(priv->reg_rngu + TALITOS_EU_FIFO_LO);

        return sizeof(u32);
}

static int talitos_rng_init(struct hwrng *rng)
{
        struct device *dev = (struct device *)rng->priv;
        struct talitos_private *priv = dev_get_drvdata(dev);
        unsigned int timeout = TALITOS_TIMEOUT;

        setbits32(priv->reg_rngu + TALITOS_EURCR_LO, TALITOS_RNGURCR_LO_SR);
        while (!(in_be32(priv->reg_rngu + TALITOS_EUSR_LO)
                 & TALITOS_RNGUSR_LO_RD)
               && --timeout)
                cpu_relax();
        if (timeout == 0) {
                dev_err(dev, "failed to reset rng hw\n");
                return -ENODEV;
        }

        /* start generating */
        setbits32(priv->reg_rngu + TALITOS_EUDSR_LO, 0);

        return 0;
}

static int talitos_register_rng(struct device *dev)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        int err;

        priv->rng.name          = dev_driver_string(dev),
        priv->rng.init          = talitos_rng_init,
        priv->rng.data_present  = talitos_rng_data_present,
        priv->rng.data_read     = talitos_rng_data_read,
        priv->rng.priv          = (unsigned long)dev;

        err = hwrng_register(&priv->rng);
        if (!err)
                priv->rng_registered = true;

        return err;
}

static void talitos_unregister_rng(struct device *dev)
{
        struct talitos_private *priv = dev_get_drvdata(dev);

        if (!priv->rng_registered)
                return;

        hwrng_unregister(&priv->rng);
        priv->rng_registered = false;
}

/*
 * crypto alg
 */
#define TALITOS_CRA_PRIORITY            3000
#define TALITOS_MAX_KEY_SIZE            96
#define TALITOS_MAX_IV_LENGTH           16 /* max of AES_BLOCK_SIZE, DES3_EDE_BLOCK_SIZE */

struct talitos_ctx {
        struct device *dev;
        int ch;
        __be32 desc_hdr_template;
        u8 key[TALITOS_MAX_KEY_SIZE];
        u8 iv[TALITOS_MAX_IV_LENGTH];
        unsigned int keylen;
        unsigned int enckeylen;
        unsigned int authkeylen;
};

#define HASH_MAX_BLOCK_SIZE             SHA512_BLOCK_SIZE
#define TALITOS_MDEU_MAX_CONTEXT_SIZE   TALITOS_MDEU_CONTEXT_SIZE_SHA384_SHA512

struct talitos_ahash_req_ctx {
        u32 hw_context[TALITOS_MDEU_MAX_CONTEXT_SIZE / sizeof(u32)];
        unsigned int hw_context_size;
        u8 buf[HASH_MAX_BLOCK_SIZE];
        u8 bufnext[HASH_MAX_BLOCK_SIZE];
        unsigned int swinit;
        unsigned int first;
        unsigned int last;
        unsigned int to_hash_later;
        unsigned int nbuf;
        struct scatterlist bufsl[2];
        struct scatterlist *psrc;
};

static int aead_setkey(struct crypto_aead *authenc,
                       const u8 *key, unsigned int keylen)
{
        struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
        struct crypto_authenc_keys keys;

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

        if (keys.authkeylen + keys.enckeylen > TALITOS_MAX_KEY_SIZE)
                goto badkey;

        memcpy(ctx->key, keys.authkey, keys.authkeylen);
        memcpy(&ctx->key[keys.authkeylen], keys.enckey, keys.enckeylen);

        ctx->keylen = keys.authkeylen + keys.enckeylen;
        ctx->enckeylen = keys.enckeylen;
        ctx->authkeylen = keys.authkeylen;

        return 0;

badkey:
        crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
        return -EINVAL;
}

/*
 * talitos_edesc - s/w-extended descriptor
 * @src_nents: number of segments in input scatterlist
 * @dst_nents: number of segments in output scatterlist
 * @icv_ool: whether ICV is out-of-line
 * @iv_dma: dma address of iv for checking continuity and link table
 * @dma_len: length of dma mapped link_tbl space
 * @dma_link_tbl: bus physical address of link_tbl/buf
 * @desc: h/w descriptor
 * @link_tbl: input and output h/w link tables (if {src,dst}_nents > 1) (SEC2)
 * @buf: input and output buffeur (if {src,dst}_nents > 1) (SEC1)
 *
 * if decrypting (with authcheck), or either one of src_nents or dst_nents
 * is greater than 1, an integrity check value is concatenated to the end
 * of link_tbl data
 */
struct talitos_edesc {
        int src_nents;
        int dst_nents;
        bool icv_ool;
        dma_addr_t iv_dma;
        int dma_len;
        dma_addr_t dma_link_tbl;
        struct talitos_desc desc;
        union {
                struct talitos_ptr link_tbl[0];
                u8 buf[0];
        };
};

static void talitos_sg_unmap(struct device *dev,
                             struct talitos_edesc *edesc,
                             struct scatterlist *src,
                             struct scatterlist *dst)
{
        unsigned int src_nents = edesc->src_nents ? : 1;
        unsigned int dst_nents = edesc->dst_nents ? : 1;

        if (src != dst) {
                dma_unmap_sg(dev, src, src_nents, DMA_TO_DEVICE);

                if (dst) {
                        dma_unmap_sg(dev, dst, dst_nents, DMA_FROM_DEVICE);
                }
        } else
                dma_unmap_sg(dev, src, src_nents, DMA_BIDIRECTIONAL);
}

static void ipsec_esp_unmap(struct device *dev,
                            struct talitos_edesc *edesc,
                            struct aead_request *areq)
{
        unmap_single_talitos_ptr(dev, &edesc->desc.ptr[6], DMA_FROM_DEVICE);
        unmap_single_talitos_ptr(dev, &edesc->desc.ptr[3], DMA_TO_DEVICE);
        unmap_single_talitos_ptr(dev, &edesc->desc.ptr[2], DMA_TO_DEVICE);
        unmap_single_talitos_ptr(dev, &edesc->desc.ptr[0], DMA_TO_DEVICE);

        talitos_sg_unmap(dev, edesc, areq->src, areq->dst);

        if (edesc->dma_len)
                dma_unmap_single(dev, edesc->dma_link_tbl, edesc->dma_len,
                                 DMA_BIDIRECTIONAL);
}

/*
 * ipsec_esp descriptor callbacks
 */
static void ipsec_esp_encrypt_done(struct device *dev,
                                   struct talitos_desc *desc, void *context,
                                   int err)
{
        struct aead_request *areq = context;
        struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
        unsigned int authsize = crypto_aead_authsize(authenc);
        struct talitos_edesc *edesc;
        struct scatterlist *sg;
        void *icvdata;

        edesc = container_of(desc, struct talitos_edesc, desc);

        ipsec_esp_unmap(dev, edesc, areq);

        /* copy the generated ICV to dst */
        if (edesc->icv_ool) {
                icvdata = &edesc->link_tbl[edesc->src_nents +
                                           edesc->dst_nents + 2];
                sg = sg_last(areq->dst, edesc->dst_nents);
                memcpy((char *)sg_virt(sg) + sg->length - authsize,
                       icvdata, authsize);
        }

        kfree(edesc);

        aead_request_complete(areq, err);
}

static void ipsec_esp_decrypt_swauth_done(struct device *dev,
                                          struct talitos_desc *desc,
                                          void *context, int err)
{
        struct aead_request *req = context;
        struct crypto_aead *authenc = crypto_aead_reqtfm(req);
        unsigned int authsize = crypto_aead_authsize(authenc);
        struct talitos_edesc *edesc;
        struct scatterlist *sg;
        char *oicv, *icv;

        edesc = container_of(desc, struct talitos_edesc, desc);

        ipsec_esp_unmap(dev, edesc, req);

        if (!err) {
                /* auth check */
                sg = sg_last(req->dst, edesc->dst_nents ? : 1);
                icv = (char *)sg_virt(sg) + sg->length - authsize;

                if (edesc->dma_len) {
                        oicv = (char *)&edesc->link_tbl[edesc->src_nents +
                                                        edesc->dst_nents + 2];
                        if (edesc->icv_ool)
                                icv = oicv + authsize;
                } else
                        oicv = (char *)&edesc->link_tbl[0];

                err = crypto_memneq(oicv, icv, authsize) ? -EBADMSG : 0;
        }

        kfree(edesc);

        aead_request_complete(req, err);
}

static void ipsec_esp_decrypt_hwauth_done(struct device *dev,
                                          struct talitos_desc *desc,
                                          void *context, int err)
{
        struct aead_request *req = context;

        struct talitos_edesc *edesc;

        edesc = container_of(desc, struct talitos_edesc, desc);

        ipsec_esp_unmap(dev, edesc, req);

        /* check ICV auth status */
        if (!err && ((desc->hdr_lo & DESC_HDR_LO_ICCR1_MASK) !=
                     DESC_HDR_LO_ICCR1_PASS))
                err = -EBADMSG;

        kfree(edesc);

        aead_request_complete(req, err);
}

/*
 * convert scatterlist to SEC h/w link table format
 * stop at cryptlen bytes
 */
static int sg_to_link_tbl_offset(struct scatterlist *sg, int sg_count,
                                 unsigned int offset, int cryptlen,
                                 struct talitos_ptr *link_tbl_ptr)
{
        int n_sg = sg_count;
        int count = 0;

        while (cryptlen && sg && n_sg--) {
                unsigned int len = sg_dma_len(sg);

                if (offset >= len) {
                        offset -= len;
                        goto next;
                }

                len -= offset;

                if (len > cryptlen)
                        len = cryptlen;

                to_talitos_ptr(link_tbl_ptr + count,
                               sg_dma_address(sg) + offset, 0);
                link_tbl_ptr[count].len = cpu_to_be16(len);
                link_tbl_ptr[count].j_extent = 0;
                count++;
                cryptlen -= len;
                offset = 0;

next:
                sg = sg_next(sg);
        }

        /* tag end of link table */
        if (count > 0)
                link_tbl_ptr[count - 1].j_extent = DESC_PTR_LNKTBL_RETURN;

        return count;
}

static inline int sg_to_link_tbl(struct scatterlist *sg, int sg_count,
                                 int cryptlen,
                                 struct talitos_ptr *link_tbl_ptr)
{
        return sg_to_link_tbl_offset(sg, sg_count, 0, cryptlen,
                                     link_tbl_ptr);
}

/*
 * fill in and submit ipsec_esp descriptor
 */
static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
                     void (*callback)(struct device *dev,
                                      struct talitos_desc *desc,
                                      void *context, int error))
{
        struct crypto_aead *aead = crypto_aead_reqtfm(areq);
        unsigned int authsize = crypto_aead_authsize(aead);
        struct talitos_ctx *ctx = crypto_aead_ctx(aead);
        struct device *dev = ctx->dev;
        struct talitos_desc *desc = &edesc->desc;
        unsigned int cryptlen = areq->cryptlen;
        unsigned int ivsize = crypto_aead_ivsize(aead);
        int tbl_off = 0;
        int sg_count, ret;
        int sg_link_tbl_len;

        /* hmac key */
        map_single_talitos_ptr(dev, &desc->ptr[0], ctx->authkeylen, &ctx->key,
                               DMA_TO_DEVICE);

        sg_count = dma_map_sg(dev, areq->src, edesc->src_nents ?: 1,
                              (areq->src == areq->dst) ? DMA_BIDIRECTIONAL
                                                           : DMA_TO_DEVICE);
        /* hmac data */
        desc->ptr[1].len = cpu_to_be16(areq->assoclen);
        if (sg_count > 1 &&
            (ret = sg_to_link_tbl_offset(areq->src, sg_count, 0,
                                         areq->assoclen,
                                         &edesc->link_tbl[tbl_off])) > 1) {
                to_talitos_ptr(&desc->ptr[1], edesc->dma_link_tbl + tbl_off *
                               sizeof(struct talitos_ptr), 0);
                desc->ptr[1].j_extent = DESC_PTR_LNKTBL_JUMP;

                dma_sync_single_for_device(dev, edesc->dma_link_tbl,
                                           edesc->dma_len, DMA_BIDIRECTIONAL);

                tbl_off += ret;
        } else {
                to_talitos_ptr(&desc->ptr[1], sg_dma_address(areq->src), 0);
                desc->ptr[1].j_extent = 0;
        }

        /* cipher iv */
        to_talitos_ptr(&desc->ptr[2], edesc->iv_dma, 0);
        desc->ptr[2].len = cpu_to_be16(ivsize);
        desc->ptr[2].j_extent = 0;

        /* cipher key */
        map_single_talitos_ptr(dev, &desc->ptr[3], ctx->enckeylen,
                               (char *)&ctx->key + ctx->authkeylen,
                               DMA_TO_DEVICE);

        /*
         * cipher in
         * map and adjust cipher len to aead request cryptlen.
         * extent is bytes of HMAC postpended to ciphertext,
         * typically 12 for ipsec
         */
        desc->ptr[4].len = cpu_to_be16(cryptlen);
        desc->ptr[4].j_extent = authsize;

        sg_link_tbl_len = cryptlen;
        if (edesc->desc.hdr & DESC_HDR_MODE1_MDEU_CICV)
                sg_link_tbl_len += authsize;

        if (sg_count == 1) {
                to_talitos_ptr(&desc->ptr[4], sg_dma_address(areq->src) +
                               areq->assoclen, 0);
        } else if ((ret = sg_to_link_tbl_offset(areq->src, sg_count,
                                                areq->assoclen, sg_link_tbl_len,
                                                &edesc->link_tbl[tbl_off])) >
                   1) {
                desc->ptr[4].j_extent |= DESC_PTR_LNKTBL_JUMP;
                to_talitos_ptr(&desc->ptr[4], edesc->dma_link_tbl +
                                              tbl_off *
                                              sizeof(struct talitos_ptr), 0);
                dma_sync_single_for_device(dev, edesc->dma_link_tbl,
                                           edesc->dma_len,
                                           DMA_BIDIRECTIONAL);
                tbl_off += ret;
        } else {
                copy_talitos_ptr(&desc->ptr[4], &edesc->link_tbl[tbl_off], 0);
        }

        /* cipher out */
        desc->ptr[5].len = cpu_to_be16(cryptlen);
        desc->ptr[5].j_extent = authsize;

        if (areq->src != areq->dst)
                sg_count = dma_map_sg(dev, areq->dst, edesc->dst_nents ? : 1,
                                      DMA_FROM_DEVICE);

        edesc->icv_ool = false;

        if (sg_count == 1) {
                to_talitos_ptr(&desc->ptr[5], sg_dma_address(areq->dst) +
                               areq->assoclen, 0);
        } else if ((sg_count =
                        sg_to_link_tbl_offset(areq->dst, sg_count,
                                              areq->assoclen, cryptlen,
                                              &edesc->link_tbl[tbl_off])) > 1) {
                struct talitos_ptr *tbl_ptr = &edesc->link_tbl[tbl_off];

                to_talitos_ptr(&desc->ptr[5], edesc->dma_link_tbl +
                               tbl_off * sizeof(struct talitos_ptr), 0);

                /* Add an entry to the link table for ICV data */
                tbl_ptr += sg_count - 1;
                tbl_ptr->j_extent = 0;
                tbl_ptr++;
                tbl_ptr->j_extent = DESC_PTR_LNKTBL_RETURN;
                tbl_ptr->len = cpu_to_be16(authsize);

                /* icv data follows link tables */
                to_talitos_ptr(tbl_ptr, edesc->dma_link_tbl +
                                        (edesc->src_nents + edesc->dst_nents +
                                         2) * sizeof(struct talitos_ptr) +
                                        authsize, 0);
                desc->ptr[5].j_extent |= DESC_PTR_LNKTBL_JUMP;
                dma_sync_single_for_device(ctx->dev, edesc->dma_link_tbl,
                                           edesc->dma_len, DMA_BIDIRECTIONAL);

                edesc->icv_ool = true;
        } else {
                copy_talitos_ptr(&desc->ptr[5], &edesc->link_tbl[tbl_off], 0);
        }

        /* iv out */
        map_single_talitos_ptr(dev, &desc->ptr[6], ivsize, ctx->iv,
                               DMA_FROM_DEVICE);

        ret = talitos_submit(dev, ctx->ch, desc, callback, areq);
        if (ret != -EINPROGRESS) {
                ipsec_esp_unmap(dev, edesc, areq);
                kfree(edesc);
        }
        return ret;
}

/*
 * allocate and map the extended descriptor
 */
static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
                                                 struct scatterlist *src,
                                                 struct scatterlist *dst,
                                                 u8 *iv,
                                                 unsigned int assoclen,
                                                 unsigned int cryptlen,
                                                 unsigned int authsize,
                                                 unsigned int ivsize,
                                                 int icv_stashing,
                                                 u32 cryptoflags,
                                                 bool encrypt)
{
        struct talitos_edesc *edesc;
        int src_nents, dst_nents, alloc_len, dma_len;
        dma_addr_t iv_dma = 0;
        gfp_t flags = cryptoflags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
                      GFP_ATOMIC;
        struct talitos_private *priv = dev_get_drvdata(dev);
        bool is_sec1 = has_ftr_sec1(priv);
        int max_len = is_sec1 ? TALITOS1_MAX_DATA_LEN : TALITOS2_MAX_DATA_LEN;
        void *err;

        if (cryptlen + authsize > max_len) {
                dev_err(dev, "length exceeds h/w max limit\n");
                return ERR_PTR(-EINVAL);
        }

        if (ivsize)
                iv_dma = dma_map_single(dev, iv, ivsize, DMA_TO_DEVICE);

        if (!dst || dst == src) {
                src_nents = sg_nents_for_len(src,
                                             assoclen + cryptlen + authsize);
                if (src_nents < 0) {
                        dev_err(dev, "Invalid number of src SG.\n");
                        err = ERR_PTR(-EINVAL);
                        goto error_sg;
                }
                src_nents = (src_nents == 1) ? 0 : src_nents;
                dst_nents = dst ? src_nents : 0;
        } else { /* dst && dst != src*/
                src_nents = sg_nents_for_len(src, assoclen + cryptlen +
                                                 (encrypt ? 0 : authsize));
                if (src_nents < 0) {
                        dev_err(dev, "Invalid number of src SG.\n");
                        err = ERR_PTR(-EINVAL);
                        goto error_sg;
                }
                src_nents = (src_nents == 1) ? 0 : src_nents;
                dst_nents = sg_nents_for_len(dst, assoclen + cryptlen +
                                                 (encrypt ? authsize : 0));
                if (dst_nents < 0) {
                        dev_err(dev, "Invalid number of dst SG.\n");
                        err = ERR_PTR(-EINVAL);
                        goto error_sg;
                }
                dst_nents = (dst_nents == 1) ? 0 : dst_nents;
        }

        /*
         * allocate space for base edesc plus the link tables,
         * allowing for two separate entries for AD and generated ICV (+ 2),
         * and space for two sets of ICVs (stashed and generated)
         */
        alloc_len = sizeof(struct talitos_edesc);
        if (src_nents || dst_nents) {
                if (is_sec1)
                        dma_len = (src_nents ? cryptlen : 0) +
                                  (dst_nents ? cryptlen : 0);
                else
                        dma_len = (src_nents + dst_nents + 2) *
                                  sizeof(struct talitos_ptr) + authsize * 2;
                alloc_len += dma_len;
        } else {
                dma_len = 0;
                alloc_len += icv_stashing ? authsize : 0;
        }

        edesc = kmalloc(alloc_len, GFP_DMA | flags);
        if (!edesc) {
                dev_err(dev, "could not allocate edescriptor\n");
                err = ERR_PTR(-ENOMEM);
                goto error_sg;
        }

        edesc->src_nents = src_nents;
        edesc->dst_nents = dst_nents;
        edesc->iv_dma = iv_dma;
        edesc->dma_len = dma_len;
        if (dma_len)
                edesc->dma_link_tbl = dma_map_single(dev, &edesc->link_tbl[0],
                                                     edesc->dma_len,
                                                     DMA_BIDIRECTIONAL);

        return edesc;
error_sg:
        if (iv_dma)
                dma_unmap_single(dev, iv_dma, ivsize, DMA_TO_DEVICE);
        return err;
}

static struct talitos_edesc *aead_edesc_alloc(struct aead_request *areq, u8 *iv,
                                              int icv_stashing, bool encrypt)
{
        struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
        unsigned int authsize = crypto_aead_authsize(authenc);
        struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
        unsigned int ivsize = crypto_aead_ivsize(authenc);

        return talitos_edesc_alloc(ctx->dev, areq->src, areq->dst,
                                   iv, areq->assoclen, areq->cryptlen,
                                   authsize, ivsize, icv_stashing,
                                   areq->base.flags, encrypt);
}

static int aead_encrypt(struct aead_request *req)
{
        struct crypto_aead *authenc = crypto_aead_reqtfm(req);
        struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
        struct talitos_edesc *edesc;

        /* allocate extended descriptor */
        edesc = aead_edesc_alloc(req, req->iv, 0, true);
        if (IS_ERR(edesc))
                return PTR_ERR(edesc);

        /* set encrypt */
        edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_MODE0_ENCRYPT;

        return ipsec_esp(edesc, req, ipsec_esp_encrypt_done);
}

static int aead_decrypt(struct aead_request *req)
{
        struct crypto_aead *authenc = crypto_aead_reqtfm(req);
        unsigned int authsize = crypto_aead_authsize(authenc);
        struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
        struct talitos_private *priv = dev_get_drvdata(ctx->dev);
        struct talitos_edesc *edesc;
        struct scatterlist *sg;
        void *icvdata;

        req->cryptlen -= authsize;

        /* allocate extended descriptor */
        edesc = aead_edesc_alloc(req, req->iv, 1, false);
        if (IS_ERR(edesc))
                return PTR_ERR(edesc);

        if ((priv->features & TALITOS_FTR_HW_AUTH_CHECK) &&
            ((!edesc->src_nents && !edesc->dst_nents) ||
             priv->features & TALITOS_FTR_SRC_LINK_TBL_LEN_INCLUDES_EXTENT)) {

                /* decrypt and check the ICV */
                edesc->desc.hdr = ctx->desc_hdr_template |
                                  DESC_HDR_DIR_INBOUND |
                                  DESC_HDR_MODE1_MDEU_CICV;

                /* reset integrity check result bits */
                edesc->desc.hdr_lo = 0;

                return ipsec_esp(edesc, req, ipsec_esp_decrypt_hwauth_done);
        }

        /* Have to check the ICV with software */
        edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_DIR_INBOUND;

        /* stash incoming ICV for later cmp with ICV generated by the h/w */
        if (edesc->dma_len)
                icvdata = (char *)&edesc->link_tbl[edesc->src_nents +
                                                   edesc->dst_nents + 2];
        else
                icvdata = &edesc->link_tbl[0];

        sg = sg_last(req->src, edesc->src_nents ? : 1);

        memcpy(icvdata, (char *)sg_virt(sg) + sg->length - authsize, authsize);

        return ipsec_esp(edesc, req, ipsec_esp_decrypt_swauth_done);
}

static int ablkcipher_setkey(struct crypto_ablkcipher *cipher,
                             const u8 *key, unsigned int keylen)
{
        struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);

        memcpy(&ctx->key, key, keylen);
        ctx->keylen = keylen;

        return 0;
}

static void unmap_sg_talitos_ptr(struct device *dev, struct scatterlist *src,
                                 struct scatterlist *dst, unsigned int len,
                                 struct talitos_edesc *edesc)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        bool is_sec1 = has_ftr_sec1(priv);

        if (is_sec1) {
                if (!edesc->src_nents) {
                        dma_unmap_sg(dev, src, 1,
                                     dst != src ? DMA_TO_DEVICE
                                                : DMA_BIDIRECTIONAL);
                }
                if (dst && edesc->dst_nents) {
                        dma_sync_single_for_device(dev,
                                                   edesc->dma_link_tbl + len,
                                                   len, DMA_FROM_DEVICE);
                        sg_copy_from_buffer(dst, edesc->dst_nents ? : 1,
                                            edesc->buf + len, len);
                } else if (dst && dst != src) {
                        dma_unmap_sg(dev, dst, 1, DMA_FROM_DEVICE);
                }
        } else {
                talitos_sg_unmap(dev, edesc, src, dst);
        }
}

static void common_nonsnoop_unmap(struct device *dev,
                                  struct talitos_edesc *edesc,
                                  struct ablkcipher_request *areq)
{
        unmap_single_talitos_ptr(dev, &edesc->desc.ptr[5], DMA_FROM_DEVICE);

        unmap_sg_talitos_ptr(dev, areq->src, areq->dst, areq->nbytes, edesc);
        unmap_single_talitos_ptr(dev, &edesc->desc.ptr[2], DMA_TO_DEVICE);
        unmap_single_talitos_ptr(dev, &edesc->desc.ptr[1], DMA_TO_DEVICE);

        if (edesc->dma_len)
                dma_unmap_single(dev, edesc->dma_link_tbl, edesc->dma_len,
                                 DMA_BIDIRECTIONAL);
}

static void ablkcipher_done(struct device *dev,
                            struct talitos_desc *desc, void *context,
                            int err)
{
        struct ablkcipher_request *areq = context;
        struct talitos_edesc *edesc;

        edesc = container_of(desc, struct talitos_edesc, desc);

        common_nonsnoop_unmap(dev, edesc, areq);

        kfree(edesc);

        areq->base.complete(&areq->base, err);
}

int map_sg_in_talitos_ptr(struct device *dev, struct scatterlist *src,
                          unsigned int len, struct talitos_edesc *edesc,
                          enum dma_data_direction dir, struct talitos_ptr *ptr)
{
        int sg_count;
        struct talitos_private *priv = dev_get_drvdata(dev);
        bool is_sec1 = has_ftr_sec1(priv);

        to_talitos_ptr_len(ptr, len, is_sec1);

        if (is_sec1) {
                sg_count = edesc->src_nents ? : 1;

                if (sg_count == 1) {
                        dma_map_sg(dev, src, 1, dir);
                        to_talitos_ptr(ptr, sg_dma_address(src), is_sec1);
                } else {
                        sg_copy_to_buffer(src, sg_count, edesc->buf, len);
                        to_talitos_ptr(ptr, edesc->dma_link_tbl, is_sec1);
                        dma_sync_single_for_device(dev, edesc->dma_link_tbl,
                                                   len, DMA_TO_DEVICE);
                }
        } else {
                to_talitos_ptr_extent_clear(ptr, is_sec1);

                sg_count = dma_map_sg(dev, src, edesc->src_nents ? : 1, dir);

                if (sg_count == 1) {
                        to_talitos_ptr(ptr, sg_dma_address(src), is_sec1);
                } else {
                        sg_count = sg_to_link_tbl(src, sg_count, len,
                                                  &edesc->link_tbl[0]);
                        if (sg_count > 1) {
                                to_talitos_ptr(ptr, edesc->dma_link_tbl, 0);
                                ptr->j_extent |= DESC_PTR_LNKTBL_JUMP;
                                dma_sync_single_for_device(dev,
                                                           edesc->dma_link_tbl,
                                                           edesc->dma_len,
                                                           DMA_BIDIRECTIONAL);
                        } else {
                                /* Only one segment now, so no link tbl needed*/
                                to_talitos_ptr(ptr, sg_dma_address(src),
                                               is_sec1);
                        }
                }
        }
        return sg_count;
}

void map_sg_out_talitos_ptr(struct device *dev, struct scatterlist *dst,
                            unsigned int len, struct talitos_edesc *edesc,
                            enum dma_data_direction dir,
                            struct talitos_ptr *ptr, int sg_count)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        bool is_sec1 = has_ftr_sec1(priv);

        if (dir != DMA_NONE)
                sg_count = dma_map_sg(dev, dst, edesc->dst_nents ? : 1, dir);

        to_talitos_ptr_len(ptr, len, is_sec1);

        if (is_sec1) {
                if (sg_count == 1) {
                        if (dir != DMA_NONE)
                                dma_map_sg(dev, dst, 1, dir);
                        to_talitos_ptr(ptr, sg_dma_address(dst), is_sec1);
                } else {
                        to_talitos_ptr(ptr, edesc->dma_link_tbl + len, is_sec1);
                        dma_sync_single_for_device(dev,
                                                   edesc->dma_link_tbl + len,
                                                   len, DMA_FROM_DEVICE);
                }
        } else {
                to_talitos_ptr_extent_clear(ptr, is_sec1);

                if (sg_count == 1) {
                        to_talitos_ptr(ptr, sg_dma_address(dst), is_sec1);
                } else {
                        struct talitos_ptr *link_tbl_ptr =
                                &edesc->link_tbl[edesc->src_nents + 1];

                        to_talitos_ptr(ptr, edesc->dma_link_tbl +
                                            (edesc->src_nents + 1) *
                                             sizeof(struct talitos_ptr), 0);
                        ptr->j_extent |= DESC_PTR_LNKTBL_JUMP;
                        sg_to_link_tbl(dst, sg_count, len, link_tbl_ptr);
                        dma_sync_single_for_device(dev, edesc->dma_link_tbl,
                                                   edesc->dma_len,
                                                   DMA_BIDIRECTIONAL);
                }
        }
}

static int common_nonsnoop(struct talitos_edesc *edesc,
                           struct ablkcipher_request *areq,
                           void (*callback) (struct device *dev,
                                             struct talitos_desc *desc,
                                             void *context, int error))
{
        struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
        struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
        struct device *dev = ctx->dev;
        struct talitos_desc *desc = &edesc->desc;
        unsigned int cryptlen = areq->nbytes;
        unsigned int ivsize = crypto_ablkcipher_ivsize(cipher);
        int sg_count, ret;
        struct talitos_private *priv = dev_get_drvdata(dev);
        bool is_sec1 = has_ftr_sec1(priv);

        /* first DWORD empty */
        desc->ptr[0] = zero_entry;

        /* cipher iv */
        to_talitos_ptr(&desc->ptr[1], edesc->iv_dma, is_sec1);
        to_talitos_ptr_len(&desc->ptr[1], ivsize, is_sec1);
        to_talitos_ptr_extent_clear(&desc->ptr[1], is_sec1);

        /* cipher key */
        map_single_talitos_ptr(dev, &desc->ptr[2], ctx->keylen,
                               (char *)&ctx->key, DMA_TO_DEVICE);

        /*
         * cipher in
         */
        sg_count = map_sg_in_talitos_ptr(dev, areq->src, cryptlen, edesc,
                                         (areq->src == areq->dst) ?
                                          DMA_BIDIRECTIONAL : DMA_TO_DEVICE,
                                          &desc->ptr[3]);

        /* cipher out */
        map_sg_out_talitos_ptr(dev, areq->dst, cryptlen, edesc,
                               (areq->src == areq->dst) ? DMA_NONE
                                                        : DMA_FROM_DEVICE,
                               &desc->ptr[4], sg_count);

        /* iv out */
        map_single_talitos_ptr(dev, &desc->ptr[5], ivsize, ctx->iv,
                               DMA_FROM_DEVICE);

        /* last DWORD empty */
        desc->ptr[6] = zero_entry;

        ret = talitos_submit(dev, ctx->ch, desc, callback, areq);
        if (ret != -EINPROGRESS) {
                common_nonsnoop_unmap(dev, edesc, areq);
                kfree(edesc);
        }
        return ret;
}

static struct talitos_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request *
                                                    areq, bool encrypt)
{
        struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
        struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
        unsigned int ivsize = crypto_ablkcipher_ivsize(cipher);

        return talitos_edesc_alloc(ctx->dev, areq->src, areq->dst,
                                   areq->info, 0, areq->nbytes, 0, ivsize, 0,
                                   areq->base.flags, encrypt);
}

static int ablkcipher_encrypt(struct ablkcipher_request *areq)
{
        struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
        struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
        struct talitos_edesc *edesc;

        /* allocate extended descriptor */
        edesc = ablkcipher_edesc_alloc(areq, true);
        if (IS_ERR(edesc))
                return PTR_ERR(edesc);

        /* set encrypt */
        edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_MODE0_ENCRYPT;

        return common_nonsnoop(edesc, areq, ablkcipher_done);
}

static int ablkcipher_decrypt(struct ablkcipher_request *areq)
{
        struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
        struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
        struct talitos_edesc *edesc;

        /* allocate extended descriptor */
        edesc = ablkcipher_edesc_alloc(areq, false);
        if (IS_ERR(edesc))
                return PTR_ERR(edesc);

        edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_DIR_INBOUND;

        return common_nonsnoop(edesc, areq, ablkcipher_done);
}

static void common_nonsnoop_hash_unmap(struct device *dev,
                                       struct talitos_edesc *edesc,
                                       struct ahash_request *areq)
{
        struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
        struct talitos_private *priv = dev_get_drvdata(dev);
        bool is_sec1 = has_ftr_sec1(priv);

        unmap_single_talitos_ptr(dev, &edesc->desc.ptr[5], DMA_FROM_DEVICE);

        unmap_sg_talitos_ptr(dev, req_ctx->psrc, NULL, 0, edesc);

        /* When using hashctx-in, must unmap it. */
        if (from_talitos_ptr_len(&edesc->desc.ptr[1], is_sec1))
                unmap_single_talitos_ptr(dev, &edesc->desc.ptr[1],
                                         DMA_TO_DEVICE);

        if (from_talitos_ptr_len(&edesc->desc.ptr[2], is_sec1))
                unmap_single_talitos_ptr(dev, &edesc->desc.ptr[2],
                                         DMA_TO_DEVICE);

        if (edesc->dma_len)
                dma_unmap_single(dev, edesc->dma_link_tbl, edesc->dma_len,
                                 DMA_BIDIRECTIONAL);

}

static void ahash_done(struct device *dev,
                       struct talitos_desc *desc, void *context,
                       int err)
{
        struct ahash_request *areq = context;
        struct talitos_edesc *edesc =
                 container_of(desc, struct talitos_edesc, desc);
        struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);

        if (!req_ctx->last && req_ctx->to_hash_later) {
                /* Position any partial block for next update/final/finup */
                memcpy(req_ctx->buf, req_ctx->bufnext, req_ctx->to_hash_later);
                req_ctx->nbuf = req_ctx->to_hash_later;
        }
        common_nonsnoop_hash_unmap(dev, edesc, areq);

        kfree(edesc);

        areq->base.complete(&areq->base, err);
}

/*
 * SEC1 doesn't like hashing of 0 sized message, so we do the padding
 * ourself and submit a padded block
 */
void talitos_handle_buggy_hash(struct talitos_ctx *ctx,
                               struct talitos_edesc *edesc,
                               struct talitos_ptr *ptr)
{
        static u8 padded_hash[64] = {
                0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        };

        pr_err_once("Bug in SEC1, padding ourself\n");
        edesc->desc.hdr &= ~DESC_HDR_MODE0_MDEU_PAD;
        map_single_talitos_ptr(ctx->dev, ptr, sizeof(padded_hash),
                               (char *)padded_hash, DMA_TO_DEVICE);
}

static int common_nonsnoop_hash(struct talitos_edesc *edesc,
                                struct ahash_request *areq, unsigned int length,
                                void (*callback) (struct device *dev,
                                                  struct talitos_desc *desc,
                                                  void *context, int error))
{
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
        struct talitos_ctx *ctx = crypto_ahash_ctx(tfm);
        struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
        struct device *dev = ctx->dev;
        struct talitos_desc *desc = &edesc->desc;
        int ret;
        struct talitos_private *priv = dev_get_drvdata(dev);
        bool is_sec1 = has_ftr_sec1(priv);

        /* first DWORD empty */
        desc->ptr[0] = zero_entry;

        /* hash context in */
        if (!req_ctx->first || req_ctx->swinit) {
                map_single_talitos_ptr(dev, &desc->ptr[1],
                                       req_ctx->hw_context_size,
                                       (char *)req_ctx->hw_context,
                                       DMA_TO_DEVICE);
                req_ctx->swinit = 0;
        } else {
                desc->ptr[1] = zero_entry;
                /* Indicate next op is not the first. */
                req_ctx->first = 0;
        }

        /* HMAC key */
        if (ctx->keylen)
                map_single_talitos_ptr(dev, &desc->ptr[2], ctx->keylen,
                                       (char *)&ctx->key, DMA_TO_DEVICE);
        else
                desc->ptr[2] = zero_entry;

        /*
         * data in
         */
        map_sg_in_talitos_ptr(dev, req_ctx->psrc, length, edesc,
                              DMA_TO_DEVICE, &desc->ptr[3]);

        /* fifth DWORD empty */
        desc->ptr[4] = zero_entry;

        /* hash/HMAC out -or- hash context out */
        if (req_ctx->last)
                map_single_talitos_ptr(dev, &desc->ptr[5],
                                       crypto_ahash_digestsize(tfm),
                                       areq->result, DMA_FROM_DEVICE);
        else
                map_single_talitos_ptr(dev, &desc->ptr[5],
                                       req_ctx->hw_context_size,
                                       req_ctx->hw_context, DMA_FROM_DEVICE);

        /* last DWORD empty */
        desc->ptr[6] = zero_entry;

        if (is_sec1 && from_talitos_ptr_len(&desc->ptr[3], true) == 0)
                talitos_handle_buggy_hash(ctx, edesc, &desc->ptr[3]);

        ret = talitos_submit(dev, ctx->ch, desc, callback, areq);
        if (ret != -EINPROGRESS) {
                common_nonsnoop_hash_unmap(dev, edesc, areq);
                kfree(edesc);
        }
        return ret;
}

static struct talitos_edesc *ahash_edesc_alloc(struct ahash_request *areq,
                                               unsigned int nbytes)
{
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
        struct talitos_ctx *ctx = crypto_ahash_ctx(tfm);
        struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);

        return talitos_edesc_alloc(ctx->dev, req_ctx->psrc, NULL, NULL, 0,
                                   nbytes, 0, 0, 0, areq->base.flags, false);
}

static int ahash_init(struct ahash_request *areq)
{
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
        struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);

        /* Initialize the context */
        req_ctx->nbuf = 0;
        req_ctx->first = 1; /* first indicates h/w must init its context */
        req_ctx->swinit = 0; /* assume h/w init of context */
        req_ctx->hw_context_size =
                (crypto_ahash_digestsize(tfm) <= SHA256_DIGEST_SIZE)
                        ? TALITOS_MDEU_CONTEXT_SIZE_MD5_SHA1_SHA256
                        : TALITOS_MDEU_CONTEXT_SIZE_SHA384_SHA512;

        return 0;
}

/*
 * on h/w without explicit sha224 support, we initialize h/w context
 * manually with sha224 constants, and tell it to run sha256.
 */
static int ahash_init_sha224_swinit(struct ahash_request *areq)
{
        struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);

        ahash_init(areq);
        req_ctx->swinit = 1;/* prevent h/w initting context with sha256 values*/

        req_ctx->hw_context[0] = SHA224_H0;
        req_ctx->hw_context[1] = SHA224_H1;
        req_ctx->hw_context[2] = SHA224_H2;
        req_ctx->hw_context[3] = SHA224_H3;
        req_ctx->hw_context[4] = SHA224_H4;
        req_ctx->hw_context[5] = SHA224_H5;
        req_ctx->hw_context[6] = SHA224_H6;
        req_ctx->hw_context[7] = SHA224_H7;

        /* init 64-bit count */
        req_ctx->hw_context[8] = 0;
        req_ctx->hw_context[9] = 0;

        return 0;
}

static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
{
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
        struct talitos_ctx *ctx = crypto_ahash_ctx(tfm);
        struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
        struct talitos_edesc *edesc;
        unsigned int blocksize =
                        crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
        unsigned int nbytes_to_hash;
        unsigned int to_hash_later;
        unsigned int nsg;
        int nents;

        if (!req_ctx->last && (nbytes + req_ctx->nbuf <= blocksize)) {
                /* Buffer up to one whole block */
                nents = sg_nents_for_len(areq->src, nbytes);
                if (nents < 0) {
                        dev_err(ctx->dev, "Invalid number of src SG.\n");
                        return nents;
                }
                sg_copy_to_buffer(areq->src, nents,
                                  req_ctx->buf + req_ctx->nbuf, nbytes);
                req_ctx->nbuf += nbytes;
                return 0;
        }

        /* At least (blocksize + 1) bytes are available to hash */
        nbytes_to_hash = nbytes + req_ctx->nbuf;
        to_hash_later = nbytes_to_hash & (blocksize - 1);

        if (req_ctx->last)
                to_hash_later = 0;
        else if (to_hash_later)
                /* There is a partial block. Hash the full block(s) now */
                nbytes_to_hash -= to_hash_later;
        else {
                /* Keep one block buffered */
                nbytes_to_hash -= blocksize;
                to_hash_later = blocksize;
        }

        /* Chain in any previously buffered data */
        if (req_ctx->nbuf) {
                nsg = (req_ctx->nbuf < nbytes_to_hash) ? 2 : 1;
                sg_init_table(req_ctx->bufsl, nsg);
                sg_set_buf(req_ctx->bufsl, req_ctx->buf, req_ctx->nbuf);
                if (nsg > 1)
                        sg_chain(req_ctx->bufsl, 2, areq->src);
                req_ctx->psrc = req_ctx->bufsl;
        } else
                req_ctx->psrc = areq->src;

        if (to_hash_later) {
                nents = sg_nents_for_len(areq->src, nbytes);
                if (nents < 0) {
                        dev_err(ctx->dev, "Invalid number of src SG.\n");
                        return nents;
                }
                sg_pcopy_to_buffer(areq->src, nents,
                                      req_ctx->bufnext,
                                      to_hash_later,
                                      nbytes - to_hash_later);
        }
        req_ctx->to_hash_later = to_hash_later;

        /* Allocate extended descriptor */
        edesc = ahash_edesc_alloc(areq, nbytes_to_hash);
        if (IS_ERR(edesc))
                return PTR_ERR(edesc);

        edesc->desc.hdr = ctx->desc_hdr_template;

        /* On last one, request SEC to pad; otherwise continue */
        if (req_ctx->last)
                edesc->desc.hdr |= DESC_HDR_MODE0_MDEU_PAD;
        else
                edesc->desc.hdr |= DESC_HDR_MODE0_MDEU_CONT;

        /* request SEC to INIT hash. */
        if (req_ctx->first && !req_ctx->swinit)
                edesc->desc.hdr |= DESC_HDR_MODE0_MDEU_INIT;

        /* When the tfm context has a keylen, it's an HMAC.
         * A first or last (ie. not middle) descriptor must request HMAC.
         */
        if (ctx->keylen && (req_ctx->first || req_ctx->last))
                edesc->desc.hdr |= DESC_HDR_MODE0_MDEU_HMAC;

        return common_nonsnoop_hash(edesc, areq, nbytes_to_hash,
                                    ahash_done);
}

static int ahash_update(struct ahash_request *areq)
{
        struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);

        req_ctx->last = 0;

        return ahash_process_req(areq, areq->nbytes);
}

static int ahash_final(struct ahash_request *areq)
{
        struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);

        req_ctx->last = 1;

        return ahash_process_req(areq, 0);
}

static int ahash_finup(struct ahash_request *areq)
{
        struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);

        req_ctx->last = 1;

        return ahash_process_req(areq, areq->nbytes);
}

static int ahash_digest(struct ahash_request *areq)
{
        struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
        struct crypto_ahash *ahash = crypto_ahash_reqtfm(areq);

        ahash->init(areq);
        req_ctx->last = 1;

        return ahash_process_req(areq, areq->nbytes);
}

struct keyhash_result {
        struct completion completion;
        int err;
};

static void keyhash_complete(struct crypto_async_request *req, int err)
{
        struct keyhash_result *res = req->data;

        if (err == -EINPROGRESS)
                return;

        res->err = err;
        complete(&res->completion);
}

static int keyhash(struct crypto_ahash *tfm, const u8 *key, unsigned int keylen,

                   u8 *hash)
{
        struct talitos_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));

        struct scatterlist sg[1];
        struct ahash_request *req;
        struct keyhash_result hresult;
        int ret;

        init_completion(&hresult.completion);

        req = ahash_request_alloc(tfm, GFP_KERNEL);
        if (!req)
                return -ENOMEM;

        /* Keep tfm keylen == 0 during hash of the long key */
        ctx->keylen = 0;
        ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
                                   keyhash_complete, &hresult);

        sg_init_one(&sg[0], key, keylen);

        ahash_request_set_crypt(req, sg, hash, keylen);
        ret = crypto_ahash_digest(req);
        switch (ret) {
        case 0:
                break;
        case -EINPROGRESS:
        case -EBUSY:
                ret = wait_for_completion_interruptible(
                        &hresult.completion);
                if (!ret)
                        ret = hresult.err;
                break;
        default:
                break;
        }
        ahash_request_free(req);

        return ret;
}

static int ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
                        unsigned int keylen)
{
        struct talitos_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
        unsigned int blocksize =
                        crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
        unsigned int digestsize = crypto_ahash_digestsize(tfm);
        unsigned int keysize = keylen;
        u8 hash[SHA512_DIGEST_SIZE];
        int ret;

        if (keylen <= blocksize)
                memcpy(ctx->key, key, keysize);
        else {
                /* Must get the hash of the long key */
                ret = keyhash(tfm, key, keylen, hash);

                if (ret) {
                        crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
                        return -EINVAL;
                }

                keysize = digestsize;
                memcpy(ctx->key, hash, digestsize);
        }

        ctx->keylen = keysize;

        return 0;
}


struct talitos_alg_template {
        u32 type;
        union {
                struct crypto_alg crypto;
                struct ahash_alg hash;
                struct aead_alg aead;
        } alg;
        __be32 desc_hdr_template;
};

static struct talitos_alg_template driver_algs[] = {
        /* AEAD algorithms.  These use a single-pass ipsec_esp descriptor */
        {       .type = CRYPTO_ALG_TYPE_AEAD,
                .alg.aead = {
                        .base = {
                                .cra_name = "authenc(hmac(sha1),cbc(aes))",
                                .cra_driver_name = "authenc-hmac-sha1-"
                                                   "cbc-aes-talitos",
                                .cra_blocksize = AES_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_ASYNC,
                        },
                        .ivsize = AES_BLOCK_SIZE,
                        .maxauthsize = SHA1_DIGEST_SIZE,
                },
                .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
                                     DESC_HDR_SEL0_AESU |
                                     DESC_HDR_MODE0_AESU_CBC |
                                     DESC_HDR_SEL1_MDEUA |
                                     DESC_HDR_MODE1_MDEU_INIT |
                                     DESC_HDR_MODE1_MDEU_PAD |
                                     DESC_HDR_MODE1_MDEU_SHA1_HMAC,
        },
        {       .type = CRYPTO_ALG_TYPE_AEAD,
                .alg.aead = {
                        .base = {
                                .cra_name = "authenc(hmac(sha1),"
                                            "cbc(des3_ede))",
                                .cra_driver_name = "authenc-hmac-sha1-"
                                                   "cbc-3des-talitos",
                                .cra_blocksize = DES3_EDE_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_ASYNC,
                        },
                        .ivsize = DES3_EDE_BLOCK_SIZE,
                        .maxauthsize = SHA1_DIGEST_SIZE,
                },
                .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
                                     DESC_HDR_SEL0_DEU |
                                     DESC_HDR_MODE0_DEU_CBC |
                                     DESC_HDR_MODE0_DEU_3DES |
                                     DESC_HDR_SEL1_MDEUA |
                                     DESC_HDR_MODE1_MDEU_INIT |
                                     DESC_HDR_MODE1_MDEU_PAD |
                                     DESC_HDR_MODE1_MDEU_SHA1_HMAC,
        },
        {       .type = CRYPTO_ALG_TYPE_AEAD,
                .alg.aead = {
                        .base = {
                                .cra_name = "authenc(hmac(sha224),cbc(aes))",
                                .cra_driver_name = "authenc-hmac-sha224-"
                                                   "cbc-aes-talitos",
                                .cra_blocksize = AES_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_ASYNC,
                        },
                        .ivsize = AES_BLOCK_SIZE,
                        .maxauthsize = SHA224_DIGEST_SIZE,
                },
                .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
                                     DESC_HDR_SEL0_AESU |
                                     DESC_HDR_MODE0_AESU_CBC |
                                     DESC_HDR_SEL1_MDEUA |
                                     DESC_HDR_MODE1_MDEU_INIT |
                                     DESC_HDR_MODE1_MDEU_PAD |
                                     DESC_HDR_MODE1_MDEU_SHA224_HMAC,
        },
        {       .type = CRYPTO_ALG_TYPE_AEAD,
                .alg.aead = {
                        .base = {
                                .cra_name = "authenc(hmac(sha224),"
                                            "cbc(des3_ede))",
                                .cra_driver_name = "authenc-hmac-sha224-"
                                                   "cbc-3des-talitos",
                                .cra_blocksize = DES3_EDE_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_ASYNC,
                        },
                        .ivsize = DES3_EDE_BLOCK_SIZE,
                        .maxauthsize = SHA224_DIGEST_SIZE,
                },
                .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
                                     DESC_HDR_SEL0_DEU |
                                     DESC_HDR_MODE0_DEU_CBC |
                                     DESC_HDR_MODE0_DEU_3DES |
                                     DESC_HDR_SEL1_MDEUA |
                                     DESC_HDR_MODE1_MDEU_INIT |
                                     DESC_HDR_MODE1_MDEU_PAD |
                                     DESC_HDR_MODE1_MDEU_SHA224_HMAC,
        },
        {       .type = CRYPTO_ALG_TYPE_AEAD,
                .alg.aead = {
                        .base = {
                                .cra_name = "authenc(hmac(sha256),cbc(aes))",
                                .cra_driver_name = "authenc-hmac-sha256-"
                                                   "cbc-aes-talitos",
                                .cra_blocksize = AES_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_ASYNC,
                        },
                        .ivsize = AES_BLOCK_SIZE,
                        .maxauthsize = SHA256_DIGEST_SIZE,
                },
                .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
                                     DESC_HDR_SEL0_AESU |
                                     DESC_HDR_MODE0_AESU_CBC |
                                     DESC_HDR_SEL1_MDEUA |
                                     DESC_HDR_MODE1_MDEU_INIT |
                                     DESC_HDR_MODE1_MDEU_PAD |
                                     DESC_HDR_MODE1_MDEU_SHA256_HMAC,
        },
        {       .type = CRYPTO_ALG_TYPE_AEAD,
                .alg.aead = {
                        .base = {
                                .cra_name = "authenc(hmac(sha256),"
                                            "cbc(des3_ede))",
                                .cra_driver_name = "authenc-hmac-sha256-"
                                                   "cbc-3des-talitos",
                                .cra_blocksize = DES3_EDE_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_ASYNC,
                        },
                        .ivsize = DES3_EDE_BLOCK_SIZE,
                        .maxauthsize = SHA256_DIGEST_SIZE,
                },
                .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
                                     DESC_HDR_SEL0_DEU |
                                     DESC_HDR_MODE0_DEU_CBC |
                                     DESC_HDR_MODE0_DEU_3DES |
                                     DESC_HDR_SEL1_MDEUA |
                                     DESC_HDR_MODE1_MDEU_INIT |
                                     DESC_HDR_MODE1_MDEU_PAD |
                                     DESC_HDR_MODE1_MDEU_SHA256_HMAC,
        },
        {       .type = CRYPTO_ALG_TYPE_AEAD,
                .alg.aead = {
                        .base = {
                                .cra_name = "authenc(hmac(sha384),cbc(aes))",
                                .cra_driver_name = "authenc-hmac-sha384-"
                                                   "cbc-aes-talitos",
                                .cra_blocksize = AES_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_ASYNC,
                        },
                        .ivsize = AES_BLOCK_SIZE,
                        .maxauthsize = SHA384_DIGEST_SIZE,
                },
                .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
                                     DESC_HDR_SEL0_AESU |
                                     DESC_HDR_MODE0_AESU_CBC |
                                     DESC_HDR_SEL1_MDEUB |
                                     DESC_HDR_MODE1_MDEU_INIT |
                                     DESC_HDR_MODE1_MDEU_PAD |
                                     DESC_HDR_MODE1_MDEUB_SHA384_HMAC,
        },
        {       .type = CRYPTO_ALG_TYPE_AEAD,
                .alg.aead = {
                        .base = {
                                .cra_name = "authenc(hmac(sha384),"
                                            "cbc(des3_ede))",
                                .cra_driver_name = "authenc-hmac-sha384-"
                                                   "cbc-3des-talitos",
                                .cra_blocksize = DES3_EDE_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_ASYNC,
                        },
                        .ivsize = DES3_EDE_BLOCK_SIZE,
                        .maxauthsize = SHA384_DIGEST_SIZE,
                },
                .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
                                     DESC_HDR_SEL0_DEU |
                                     DESC_HDR_MODE0_DEU_CBC |
                                     DESC_HDR_MODE0_DEU_3DES |
                                     DESC_HDR_SEL1_MDEUB |
                                     DESC_HDR_MODE1_MDEU_INIT |
                                     DESC_HDR_MODE1_MDEU_PAD |
                                     DESC_HDR_MODE1_MDEUB_SHA384_HMAC,
        },
        {       .type = CRYPTO_ALG_TYPE_AEAD,
                .alg.aead = {
                        .base = {
                                .cra_name = "authenc(hmac(sha512),cbc(aes))",
                                .cra_driver_name = "authenc-hmac-sha512-"
                                                   "cbc-aes-talitos",
                                .cra_blocksize = AES_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_ASYNC,
                        },
                        .ivsize = AES_BLOCK_SIZE,
                        .maxauthsize = SHA512_DIGEST_SIZE,
                },
                .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
                                     DESC_HDR_SEL0_AESU |
                                     DESC_HDR_MODE0_AESU_CBC |
                                     DESC_HDR_SEL1_MDEUB |
                                     DESC_HDR_MODE1_MDEU_INIT |
                                     DESC_HDR_MODE1_MDEU_PAD |
                                     DESC_HDR_MODE1_MDEUB_SHA512_HMAC,
        },
        {       .type = CRYPTO_ALG_TYPE_AEAD,
                .alg.aead = {
                        .base = {
                                .cra_name = "authenc(hmac(sha512),"
                                            "cbc(des3_ede))",
                                .cra_driver_name = "authenc-hmac-sha512-"
                                                   "cbc-3des-talitos",
                                .cra_blocksize = DES3_EDE_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_ASYNC,
                        },
                        .ivsize = DES3_EDE_BLOCK_SIZE,
                        .maxauthsize = SHA512_DIGEST_SIZE,
                },
                .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
                                     DESC_HDR_SEL0_DEU |
                                     DESC_HDR_MODE0_DEU_CBC |
                                     DESC_HDR_MODE0_DEU_3DES |
                                     DESC_HDR_SEL1_MDEUB |
                                     DESC_HDR_MODE1_MDEU_INIT |
                                     DESC_HDR_MODE1_MDEU_PAD |
                                     DESC_HDR_MODE1_MDEUB_SHA512_HMAC,
        },
        {       .type = CRYPTO_ALG_TYPE_AEAD,
                .alg.aead = {
                        .base = {
                                .cra_name = "authenc(hmac(md5),cbc(aes))",
                                .cra_driver_name = "authenc-hmac-md5-"
                                                   "cbc-aes-talitos",
                                .cra_blocksize = AES_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_ASYNC,
                        },
                        .ivsize = AES_BLOCK_SIZE,
                        .maxauthsize = MD5_DIGEST_SIZE,
                },
                .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
                                     DESC_HDR_SEL0_AESU |
                                     DESC_HDR_MODE0_AESU_CBC |
                                     DESC_HDR_SEL1_MDEUA |
                                     DESC_HDR_MODE1_MDEU_INIT |
                                     DESC_HDR_MODE1_MDEU_PAD |
                                     DESC_HDR_MODE1_MDEU_MD5_HMAC,
        },
        {       .type = CRYPTO_ALG_TYPE_AEAD,
                .alg.aead = {
                        .base = {
                                .cra_name = "authenc(hmac(md5),cbc(des3_ede))",
                                .cra_driver_name = "authenc-hmac-md5-"
                                                   "cbc-3des-talitos",
                                .cra_blocksize = DES3_EDE_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_ASYNC,
                        },
                        .ivsize = DES3_EDE_BLOCK_SIZE,
                        .maxauthsize = MD5_DIGEST_SIZE,
                },
                .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
                                     DESC_HDR_SEL0_DEU |
                                     DESC_HDR_MODE0_DEU_CBC |
                                     DESC_HDR_MODE0_DEU_3DES |
                                     DESC_HDR_SEL1_MDEUA |
                                     DESC_HDR_MODE1_MDEU_INIT |
                                     DESC_HDR_MODE1_MDEU_PAD |
                                     DESC_HDR_MODE1_MDEU_MD5_HMAC,
        },
        /* ABLKCIPHER algorithms. */
        {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
                .alg.crypto = {
                        .cra_name = "ecb(aes)",
                        .cra_driver_name = "ecb-aes-talitos",
                        .cra_blocksize = AES_BLOCK_SIZE,
                        .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
                                     CRYPTO_ALG_ASYNC,
                        .cra_ablkcipher = {
                                .min_keysize = AES_MIN_KEY_SIZE,
                                .max_keysize = AES_MAX_KEY_SIZE,
                                .ivsize = AES_BLOCK_SIZE,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_AESU,
        },
        {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
                .alg.crypto = {
                        .cra_name = "cbc(aes)",
                        .cra_driver_name = "cbc-aes-talitos",
                        .cra_blocksize = AES_BLOCK_SIZE,
                        .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
                                     CRYPTO_ALG_ASYNC,
                        .cra_ablkcipher = {
                                .min_keysize = AES_MIN_KEY_SIZE,
                                .max_keysize = AES_MAX_KEY_SIZE,
                                .ivsize = AES_BLOCK_SIZE,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_AESU |
                                     DESC_HDR_MODE0_AESU_CBC,
        },
        {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
                .alg.crypto = {
                        .cra_name = "ctr(aes)",
                        .cra_driver_name = "ctr-aes-talitos",
                        .cra_blocksize = AES_BLOCK_SIZE,
                        .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
                                     CRYPTO_ALG_ASYNC,
                        .cra_ablkcipher = {
                                .min_keysize = AES_MIN_KEY_SIZE,
                                .max_keysize = AES_MAX_KEY_SIZE,
                                .ivsize = AES_BLOCK_SIZE,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_AESU |
                                     DESC_HDR_MODE0_AESU_CTR,
        },
        {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
                .alg.crypto = {
                        .cra_name = "ecb(des)",
                        .cra_driver_name = "ecb-des-talitos",
                        .cra_blocksize = DES_BLOCK_SIZE,
                        .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
                                     CRYPTO_ALG_ASYNC,
                        .cra_ablkcipher = {
                                .min_keysize = DES_KEY_SIZE,
                                .max_keysize = DES_KEY_SIZE,
                                .ivsize = DES_BLOCK_SIZE,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_DEU,
        },
        {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
                .alg.crypto = {
                        .cra_name = "cbc(des)",
                        .cra_driver_name = "cbc-des-talitos",
                        .cra_blocksize = DES_BLOCK_SIZE,
                        .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
                                     CRYPTO_ALG_ASYNC,
                        .cra_ablkcipher = {
                                .min_keysize = DES_KEY_SIZE,
                                .max_keysize = DES_KEY_SIZE,
                                .ivsize = DES_BLOCK_SIZE,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_DEU |
                                     DESC_HDR_MODE0_DEU_CBC,
        },
        {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
                .alg.crypto = {
                        .cra_name = "ecb(des3_ede)",
                        .cra_driver_name = "ecb-3des-talitos",
                        .cra_blocksize = DES3_EDE_BLOCK_SIZE,
                        .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
                                     CRYPTO_ALG_ASYNC,
                        .cra_ablkcipher = {
                                .min_keysize = DES3_EDE_KEY_SIZE,
                                .max_keysize = DES3_EDE_KEY_SIZE,
                                .ivsize = DES3_EDE_BLOCK_SIZE,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_DEU |
                                     DESC_HDR_MODE0_DEU_3DES,
        },
        {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
                .alg.crypto = {
                        .cra_name = "cbc(des3_ede)",
                        .cra_driver_name = "cbc-3des-talitos",
                        .cra_blocksize = DES3_EDE_BLOCK_SIZE,
                        .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
                                     CRYPTO_ALG_ASYNC,
                        .cra_ablkcipher = {
                                .min_keysize = DES3_EDE_KEY_SIZE,
                                .max_keysize = DES3_EDE_KEY_SIZE,
                                .ivsize = DES3_EDE_BLOCK_SIZE,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_DEU |
                                     DESC_HDR_MODE0_DEU_CBC |
                                     DESC_HDR_MODE0_DEU_3DES,
        },
        /* AHASH algorithms. */
        {       .type = CRYPTO_ALG_TYPE_AHASH,
                .alg.hash = {
                        .halg.digestsize = MD5_DIGEST_SIZE,
                        .halg.base = {
                                .cra_name = "md5",
                                .cra_driver_name = "md5-talitos",
                                .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_TYPE_AHASH |
                                             CRYPTO_ALG_ASYNC,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_MDEUA |
                                     DESC_HDR_MODE0_MDEU_MD5,
        },
        {       .type = CRYPTO_ALG_TYPE_AHASH,
                .alg.hash = {
                        .halg.digestsize = SHA1_DIGEST_SIZE,
                        .halg.base = {
                                .cra_name = "sha1",
                                .cra_driver_name = "sha1-talitos",
                                .cra_blocksize = SHA1_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_TYPE_AHASH |
                                             CRYPTO_ALG_ASYNC,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_MDEUA |
                                     DESC_HDR_MODE0_MDEU_SHA1,
        },
        {       .type = CRYPTO_ALG_TYPE_AHASH,
                .alg.hash = {
                        .halg.digestsize = SHA224_DIGEST_SIZE,
                        .halg.base = {
                                .cra_name = "sha224",
                                .cra_driver_name = "sha224-talitos",
                                .cra_blocksize = SHA224_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_TYPE_AHASH |
                                             CRYPTO_ALG_ASYNC,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_MDEUA |
                                     DESC_HDR_MODE0_MDEU_SHA224,
        },
        {       .type = CRYPTO_ALG_TYPE_AHASH,
                .alg.hash = {
                        .halg.digestsize = SHA256_DIGEST_SIZE,
                        .halg.base = {
                                .cra_name = "sha256",
                                .cra_driver_name = "sha256-talitos",
                                .cra_blocksize = SHA256_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_TYPE_AHASH |
                                             CRYPTO_ALG_ASYNC,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_MDEUA |
                                     DESC_HDR_MODE0_MDEU_SHA256,
        },
        {       .type = CRYPTO_ALG_TYPE_AHASH,
                .alg.hash = {
                        .halg.digestsize = SHA384_DIGEST_SIZE,
                        .halg.base = {
                                .cra_name = "sha384",
                                .cra_driver_name = "sha384-talitos",
                                .cra_blocksize = SHA384_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_TYPE_AHASH |
                                             CRYPTO_ALG_ASYNC,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_MDEUB |
                                     DESC_HDR_MODE0_MDEUB_SHA384,
        },
        {       .type = CRYPTO_ALG_TYPE_AHASH,
                .alg.hash = {
                        .halg.digestsize = SHA512_DIGEST_SIZE,
                        .halg.base = {
                                .cra_name = "sha512",
                                .cra_driver_name = "sha512-talitos",
                                .cra_blocksize = SHA512_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_TYPE_AHASH |
                                             CRYPTO_ALG_ASYNC,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_MDEUB |
                                     DESC_HDR_MODE0_MDEUB_SHA512,
        },
        {       .type = CRYPTO_ALG_TYPE_AHASH,
                .alg.hash = {
                        .halg.digestsize = MD5_DIGEST_SIZE,
                        .halg.base = {
                                .cra_name = "hmac(md5)",
                                .cra_driver_name = "hmac-md5-talitos",
                                .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_TYPE_AHASH |
                                             CRYPTO_ALG_ASYNC,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_MDEUA |
                                     DESC_HDR_MODE0_MDEU_MD5,
        },
        {       .type = CRYPTO_ALG_TYPE_AHASH,
                .alg.hash = {
                        .halg.digestsize = SHA1_DIGEST_SIZE,
                        .halg.base = {
                                .cra_name = "hmac(sha1)",
                                .cra_driver_name = "hmac-sha1-talitos",
                                .cra_blocksize = SHA1_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_TYPE_AHASH |
                                             CRYPTO_ALG_ASYNC,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_MDEUA |
                                     DESC_HDR_MODE0_MDEU_SHA1,
        },
        {       .type = CRYPTO_ALG_TYPE_AHASH,
                .alg.hash = {
                        .halg.digestsize = SHA224_DIGEST_SIZE,
                        .halg.base = {
                                .cra_name = "hmac(sha224)",
                                .cra_driver_name = "hmac-sha224-talitos",
                                .cra_blocksize = SHA224_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_TYPE_AHASH |
                                             CRYPTO_ALG_ASYNC,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_MDEUA |
                                     DESC_HDR_MODE0_MDEU_SHA224,
        },
        {       .type = CRYPTO_ALG_TYPE_AHASH,
                .alg.hash = {
                        .halg.digestsize = SHA256_DIGEST_SIZE,
                        .halg.base = {
                                .cra_name = "hmac(sha256)",
                                .cra_driver_name = "hmac-sha256-talitos",
                                .cra_blocksize = SHA256_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_TYPE_AHASH |
                                             CRYPTO_ALG_ASYNC,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_MDEUA |
                                     DESC_HDR_MODE0_MDEU_SHA256,
        },
        {       .type = CRYPTO_ALG_TYPE_AHASH,
                .alg.hash = {
                        .halg.digestsize = SHA384_DIGEST_SIZE,
                        .halg.base = {
                                .cra_name = "hmac(sha384)",
                                .cra_driver_name = "hmac-sha384-talitos",
                                .cra_blocksize = SHA384_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_TYPE_AHASH |
                                             CRYPTO_ALG_ASYNC,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_MDEUB |
                                     DESC_HDR_MODE0_MDEUB_SHA384,
        },
        {       .type = CRYPTO_ALG_TYPE_AHASH,
                .alg.hash = {
                        .halg.digestsize = SHA512_DIGEST_SIZE,
                        .halg.base = {
                                .cra_name = "hmac(sha512)",
                                .cra_driver_name = "hmac-sha512-talitos",
                                .cra_blocksize = SHA512_BLOCK_SIZE,
                                .cra_flags = CRYPTO_ALG_TYPE_AHASH |
                                             CRYPTO_ALG_ASYNC,
                        }
                },
                .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                     DESC_HDR_SEL0_MDEUB |
                                     DESC_HDR_MODE0_MDEUB_SHA512,
        }
};

struct talitos_crypto_alg {
        struct list_head entry;
        struct device *dev;
        struct talitos_alg_template algt;
};

static int talitos_init_common(struct talitos_ctx *ctx,
                               struct talitos_crypto_alg *talitos_alg)
{
        struct talitos_private *priv;

        /* update context with ptr to dev */
        ctx->dev = talitos_alg->dev;

        /* assign SEC channel to tfm in round-robin fashion */
        priv = dev_get_drvdata(ctx->dev);
        ctx->ch = atomic_inc_return(&priv->last_chan) &
                  (priv->num_channels - 1);

        /* copy descriptor header template value */
        ctx->desc_hdr_template = talitos_alg->algt.desc_hdr_template;

        /* select done notification */
        ctx->desc_hdr_template |= DESC_HDR_DONE_NOTIFY;

        return 0;
}

static int talitos_cra_init(struct crypto_tfm *tfm)
{
        struct crypto_alg *alg = tfm->__crt_alg;
        struct talitos_crypto_alg *talitos_alg;
        struct talitos_ctx *ctx = crypto_tfm_ctx(tfm);

        if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_AHASH)
                talitos_alg = container_of(__crypto_ahash_alg(alg),
                                           struct talitos_crypto_alg,
                                           algt.alg.hash);
        else
                talitos_alg = container_of(alg, struct talitos_crypto_alg,
                                           algt.alg.crypto);

        return talitos_init_common(ctx, talitos_alg);
}

static int talitos_cra_init_aead(struct crypto_aead *tfm)
{
        struct aead_alg *alg = crypto_aead_alg(tfm);
        struct talitos_crypto_alg *talitos_alg;
        struct talitos_ctx *ctx = crypto_aead_ctx(tfm);

        talitos_alg = container_of(alg, struct talitos_crypto_alg,
                                   algt.alg.aead);

        return talitos_init_common(ctx, talitos_alg);
}

static int talitos_cra_init_ahash(struct crypto_tfm *tfm)
{
        struct talitos_ctx *ctx = crypto_tfm_ctx(tfm);

        talitos_cra_init(tfm);

        ctx->keylen = 0;
        crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
                                 sizeof(struct talitos_ahash_req_ctx));

        return 0;
}

/*
 * given the alg's descriptor header template, determine whether descriptor
 * type and primary/secondary execution units required match the hw
 * capabilities description provided in the device tree node.
 */
static int hw_supports(struct device *dev, __be32 desc_hdr_template)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        int ret;

        ret = (1 << DESC_TYPE(desc_hdr_template) & priv->desc_types) &&
              (1 << PRIMARY_EU(desc_hdr_template) & priv->exec_units);

        if (SECONDARY_EU(desc_hdr_template))
                ret = ret && (1 << SECONDARY_EU(desc_hdr_template)
                              & priv->exec_units);

        return ret;
}

static int talitos_remove(struct platform_device *ofdev)
{
        struct device *dev = &ofdev->dev;
        struct talitos_private *priv = dev_get_drvdata(dev);
        struct talitos_crypto_alg *t_alg, *n;
        int i;

        list_for_each_entry_safe(t_alg, n, &priv->alg_list, entry) {
                switch (t_alg->algt.type) {
                case CRYPTO_ALG_TYPE_ABLKCIPHER:
                        break;
                case CRYPTO_ALG_TYPE_AEAD:
                        crypto_unregister_aead(&t_alg->algt.alg.aead);
                case CRYPTO_ALG_TYPE_AHASH:
                        crypto_unregister_ahash(&t_alg->algt.alg.hash);
                        break;
                }
                list_del(&t_alg->entry);
                kfree(t_alg);
        }

        if (hw_supports(dev, DESC_HDR_SEL0_RNG))
                talitos_unregister_rng(dev);

        for (i = 0; priv->chan && i < priv->num_channels; i++)
                kfree(priv->chan[i].fifo);

        kfree(priv->chan);

        for (i = 0; i < 2; i++)
                if (priv->irq[i]) {
                        free_irq(priv->irq[i], dev);
                        irq_dispose_mapping(priv->irq[i]);
                }

        tasklet_kill(&priv->done_task[0]);
        if (priv->irq[1])
                tasklet_kill(&priv->done_task[1]);

        iounmap(priv->reg);

        kfree(priv);

        return 0;
}

static struct talitos_crypto_alg *talitos_alg_alloc(struct device *dev,
                                                    struct talitos_alg_template
                                                           *template)
{
        struct talitos_private *priv = dev_get_drvdata(dev);
        struct talitos_crypto_alg *t_alg;
        struct crypto_alg *alg;

        t_alg = kzalloc(sizeof(struct talitos_crypto_alg), GFP_KERNEL);
        if (!t_alg)
                return ERR_PTR(-ENOMEM);

        t_alg->algt = *template;

        switch (t_alg->algt.type) {
        case CRYPTO_ALG_TYPE_ABLKCIPHER:
                alg = &t_alg->algt.alg.crypto;
                alg->cra_init = talitos_cra_init;
                alg->cra_type = &crypto_ablkcipher_type;
                alg->cra_ablkcipher.setkey = ablkcipher_setkey;
                alg->cra_ablkcipher.encrypt = ablkcipher_encrypt;
                alg->cra_ablkcipher.decrypt = ablkcipher_decrypt;
                alg->cra_ablkcipher.geniv = "eseqiv";
                break;
        case CRYPTO_ALG_TYPE_AEAD:
                alg = &t_alg->algt.alg.aead.base;
                t_alg->algt.alg.aead.init = talitos_cra_init_aead;
                t_alg->algt.alg.aead.setkey = aead_setkey;
                t_alg->algt.alg.aead.encrypt = aead_encrypt;
                t_alg->algt.alg.aead.decrypt = aead_decrypt;
                break;
        case CRYPTO_ALG_TYPE_AHASH:
                alg = &t_alg->algt.alg.hash.halg.base;
                alg->cra_init = talitos_cra_init_ahash;
                alg->cra_type = &crypto_ahash_type;
                t_alg->algt.alg.hash.init = ahash_init;
                t_alg->algt.alg.hash.update = ahash_update;
                t_alg->algt.alg.hash.final = ahash_final;
                t_alg->algt.alg.hash.finup = ahash_finup;
                t_alg->algt.alg.hash.digest = ahash_digest;
                t_alg->algt.alg.hash.setkey = ahash_setkey;

                if (!(priv->features & TALITOS_FTR_HMAC_OK) &&
                    !strncmp(alg->cra_name, "hmac", 4)) {
                        kfree(t_alg);
                        return ERR_PTR(-ENOTSUPP);
                }
                if (!(priv->features & TALITOS_FTR_SHA224_HWINIT) &&
                    (!strcmp(alg->cra_name, "sha224") ||
                     !strcmp(alg->cra_name, "hmac(sha224)"))) {
                        t_alg->algt.alg.hash.init = ahash_init_sha224_swinit;
                        t_alg->algt.desc_hdr_template =
                                        DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
                                        DESC_HDR_SEL0_MDEUA |
                                        DESC_HDR_MODE0_MDEU_SHA256;
                }
                break;
        default:
                dev_err(dev, "unknown algorithm type %d\n", t_alg->algt.type);
                kfree(t_alg);
                return ERR_PTR(-EINVAL);
        }

        alg->cra_module = THIS_MODULE;
        alg->cra_priority = TALITOS_CRA_PRIORITY;
        alg->cra_alignmask = 0;
        alg->cra_ctxsize = sizeof(struct talitos_ctx);
        alg->cra_flags |= CRYPTO_ALG_KERN_DRIVER_ONLY;

        t_alg->dev = dev;

        return t_alg;
}

static int talitos_probe_irq(struct platform_device *ofdev)
{
        struct device *dev = &ofdev->dev;
        struct device_node *np = ofdev->dev.of_node;
        struct talitos_private *priv = dev_get_drvdata(dev);
        int err;
        bool is_sec1 = has_ftr_sec1(priv);

        priv->irq[0] = irq_of_parse_and_map(np, 0);
        if (!priv->irq[0]) {
                dev_err(dev, "failed to map irq\n");
                return -EINVAL;
        }
        if (is_sec1) {
                err = request_irq(priv->irq[0], talitos1_interrupt_4ch, 0,
                                  dev_driver_string(dev), dev);
                goto primary_out;
        }

        priv->irq[1] = irq_of_parse_and_map(np, 1);

        /* get the primary irq line */
        if (!priv->irq[1]) {
                err = request_irq(priv->irq[0], talitos2_interrupt_4ch, 0,
                                  dev_driver_string(dev), dev);
                goto primary_out;
        }

        err = request_irq(priv->irq[0], talitos2_interrupt_ch0_2, 0,
                          dev_driver_string(dev), dev);
        if (err)
                goto primary_out;

        /* get the secondary irq line */
        err = request_irq(priv->irq[1], talitos2_interrupt_ch1_3, 0,
                          dev_driver_string(dev), dev);
        if (err) {
                dev_err(dev, "failed to request secondary irq\n");
                irq_dispose_mapping(priv->irq[1]);
                priv->irq[1] = 0;
        }

        return err;

primary_out:
        if (err) {
                dev_err(dev, "failed to request primary irq\n");
                irq_dispose_mapping(priv->irq[0]);
                priv->irq[0] = 0;
        }

        return err;
}

static int talitos_probe(struct platform_device *ofdev)
{
        struct device *dev = &ofdev->dev;
        struct device_node *np = ofdev->dev.of_node;
        struct talitos_private *priv;
        const unsigned int *prop;
        int i, err;
        int stride;

        priv = kzalloc(sizeof(struct talitos_private), GFP_KERNEL);
        if (!priv)
                return -ENOMEM;

        INIT_LIST_HEAD(&priv->alg_list);

        dev_set_drvdata(dev, priv);

        priv->ofdev = ofdev;

        spin_lock_init(&priv->reg_lock);

        priv->reg = of_iomap(np, 0);
        if (!priv->reg) {
                dev_err(dev, "failed to of_iomap\n");
                err = -ENOMEM;
                goto err_out;
        }

        /* get SEC version capabilities from device tree */
        prop = of_get_property(np, "fsl,num-channels", NULL);
        if (prop)
                priv->num_channels = *prop;

        prop = of_get_property(np, "fsl,channel-fifo-len", NULL);
        if (prop)
                priv->chfifo_len = *prop;

        prop = of_get_property(np, "fsl,exec-units-mask", NULL);
        if (prop)
                priv->exec_units = *prop;

        prop = of_get_property(np, "fsl,descriptor-types-mask", NULL);
        if (prop)
                priv->desc_types = *prop;

        if (!is_power_of_2(priv->num_channels) || !priv->chfifo_len ||
            !priv->exec_units || !priv->desc_types) {
                dev_err(dev, "invalid property data in device tree node\n");
                err = -EINVAL;
                goto err_out;
        }

        if (of_device_is_compatible(np, "fsl,sec3.0"))
                priv->features |= TALITOS_FTR_SRC_LINK_TBL_LEN_INCLUDES_EXTENT;

        if (of_device_is_compatible(np, "fsl,sec2.1"))
                priv->features |= TALITOS_FTR_HW_AUTH_CHECK |
                                  TALITOS_FTR_SHA224_HWINIT |
                                  TALITOS_FTR_HMAC_OK;

        if (of_device_is_compatible(np, "fsl,sec1.0"))
                priv->features |= TALITOS_FTR_SEC1;

        if (of_device_is_compatible(np, "fsl,sec1.2")) {
                priv->reg_deu = priv->reg + TALITOS12_DEU;
                priv->reg_aesu = priv->reg + TALITOS12_AESU;
                priv->reg_mdeu = priv->reg + TALITOS12_MDEU;
                stride = TALITOS1_CH_STRIDE;
        } else if (of_device_is_compatible(np, "fsl,sec1.0")) {
                priv->reg_deu = priv->reg + TALITOS10_DEU;
                priv->reg_aesu = priv->reg + TALITOS10_AESU;
                priv->reg_mdeu = priv->reg + TALITOS10_MDEU;
                priv->reg_afeu = priv->reg + TALITOS10_AFEU;
                priv->reg_rngu = priv->reg + TALITOS10_RNGU;
                priv->reg_pkeu = priv->reg + TALITOS10_PKEU;
                stride = TALITOS1_CH_STRIDE;
        } else {
                priv->reg_deu = priv->reg + TALITOS2_DEU;
                priv->reg_aesu = priv->reg + TALITOS2_AESU;
                priv->reg_mdeu = priv->reg + TALITOS2_MDEU;
                priv->reg_afeu = priv->reg + TALITOS2_AFEU;
                priv->reg_rngu = priv->reg + TALITOS2_RNGU;
                priv->reg_pkeu = priv->reg + TALITOS2_PKEU;
                priv->reg_keu = priv->reg + TALITOS2_KEU;
                priv->reg_crcu = priv->reg + TALITOS2_CRCU;
                stride = TALITOS2_CH_STRIDE;
        }

        err = talitos_probe_irq(ofdev);
        if (err)
                goto err_out;

        if (of_device_is_compatible(np, "fsl,sec1.0")) {
                tasklet_init(&priv->done_task[0], talitos1_done_4ch,
                             (unsigned long)dev);
        } else {
                if (!priv->irq[1]) {