crypto: talitos - Freescale integrated security engine (SEC) driver

Add support for the SEC available on a wide range of PowerQUICC devices,
e.g. MPC8349E, MPC8548E.

This initial version supports authenc(hmac(sha1),cbc(aes)) for use with IPsec.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

4 files changed, 1684 insertions, 0 deletions

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 43b71b69daa5..249c1358058e 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -174,4 +174,20 @@ config CRYPTO_DEV_HIFN_795X_RNG
 	  Select this option if you want to enable the random number generator
 	  on the HIFN 795x crypto adapters.
 
+config CRYPTO_DEV_TALITOS
+	tristate "Talitos Freescale Security Engine (SEC)"
+	select CRYPTO_ALGAPI
+	select CRYPTO_AUTHENC
+	select HW_RANDOM
+	depends on FSL_SOC
+	help
+	  Say 'Y' here to use the Freescale Security Engine (SEC)
+	  to offload cryptographic algorithm computation.
+
+	  The Freescale SEC is present on PowerQUICC 'E' processors, such
+	  as the MPC8349E and MPC8548E.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called talitos.
+
 endif # CRYPTO_HW
diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
index c0327f0dadc5..d29d2cd0e658 100644
--- a/drivers/crypto/Makefile
+++ b/drivers/crypto/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CRYPTO_DEV_PADLOCK_AES) += padlock-aes.o
 obj-$(CONFIG_CRYPTO_DEV_PADLOCK_SHA) += padlock-sha.o
 obj-$(CONFIG_CRYPTO_DEV_GEODE) += geode-aes.o
 obj-$(CONFIG_CRYPTO_DEV_HIFN_795X) += hifn_795x.o
+obj-$(CONFIG_CRYPTO_DEV_TALITOS) += talitos.o
diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
new file mode 100644
index 000000000000..e12331296a00
--- /dev/null
+++ b/drivers/crypto/talitos.c
@@ -0,0 +1,1467 @@
+/*
+ * talitos - Freescale Integrated Security Engine (SEC) device driver
+ *
+ * Copyright (c) 2008 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_platform.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+#include <linux/rtnetlink.h>
+
+#include <crypto/algapi.h>
+#include <crypto/aes.h>
+#include <crypto/sha.h>
+#include <crypto/aead.h>
+#include <crypto/authenc.h>
+
+#include "talitos.h"
+
+#define TALITOS_TIMEOUT 100000
+#define TALITOS_MAX_DATA_LEN 65535
+
+#define DESC_TYPE(desc_hdr) ((be32_to_cpu(desc_hdr) >> 3) & 0x1f)
+#define PRIMARY_EU(desc_hdr) ((be32_to_cpu(desc_hdr) >> 28) & 0xf)
+#define SECONDARY_EU(desc_hdr) ((be32_to_cpu(desc_hdr) >> 16) & 0xf)
+
+/* descriptor pointer entry */
+struct talitos_ptr {
+	__be16 len;	/* length */
+	u8 j_extent;	/* jump to sg link table and/or extent */
+	u8 eptr;	/* extended address */
+	__be32 ptr;	/* address */
+};
+
+/* descriptor */
+struct talitos_desc {
+	__be32 hdr;			/* header high bits */
+	__be32 hdr_lo;			/* header low bits */
+	struct talitos_ptr ptr[7];	/* ptr/len pair array */
+};
+
+/**
+ * talitos_request - descriptor submission request
+ * @desc: descriptor pointer (kernel virtual)
+ * @dma_desc: descriptor's physical bus address
+ * @callback: whom to call when descriptor processing is done
+ * @context: caller context (optional)
+ */
+struct talitos_request {
+	struct talitos_desc *desc;
+	dma_addr_t dma_desc;
+	void (*callback) (struct device *dev, struct talitos_desc *desc,
+	                  void *context, int error);
+	void *context;
+};
+
+struct talitos_private {
+	struct device *dev;
+	struct of_device *ofdev;
+	void __iomem *reg;
+	int irq;
+
+	/* SEC version geometry (from device tree node) */
+	unsigned int num_channels;
+	unsigned int chfifo_len;
+	unsigned int exec_units;
+	unsigned int desc_types;
+
+	/* next channel to be assigned next incoming descriptor */
+	atomic_t last_chan;
+
+	/* per-channel request fifo */
+	struct talitos_request **fifo;
+
+	/*
+	 * length of the request fifo
+	 * fifo_len is chfifo_len rounded up to next power of 2
+	 * so we can use bitwise ops to wrap
+	 */
+	unsigned int fifo_len;
+
+	/* per-channel index to next free descriptor request */
+	int *head;
+
+	/* per-channel index to next in-progress/done descriptor request */
+	int *tail;
+
+	/* per-channel request submission (head) and release (tail) locks */
+	spinlock_t *head_lock;
+	spinlock_t *tail_lock;
+
+	/* request callback tasklet */
+	struct tasklet_struct done_task;
+	struct tasklet_struct error_task;
+
+	/* list of registered algorithms */
+	struct list_head alg_list;
+
+	/* hwrng device */
+	struct hwrng rng;
+};
+
+/*
+ * map virtual single (contiguous) pointer to h/w descriptor pointer
+ */
+static void map_single_talitos_ptr(struct device *dev,
+				   struct talitos_ptr *talitos_ptr,
+				   unsigned short len, void *data,
+				   unsigned char extent,
+				   enum dma_data_direction dir)
+{
+	talitos_ptr->len = cpu_to_be16(len);
+	talitos_ptr->ptr = cpu_to_be32(dma_map_single(dev, data, len, dir));
+	talitos_ptr->j_extent = extent;
+}
+
+/*
+ * unmap bus single (contiguous) h/w descriptor pointer
+ */
+static void unmap_single_talitos_ptr(struct device *dev,
+				     struct talitos_ptr *talitos_ptr,
+				     enum dma_data_direction dir)
+{
+	dma_unmap_single(dev, be32_to_cpu(talitos_ptr->ptr),
+			 be16_to_cpu(talitos_ptr->len), dir);
+}
+
+static int reset_channel(struct device *dev, int ch)
+{
+	struct talitos_private *priv = dev_get_drvdata(dev);
+	unsigned int timeout = TALITOS_TIMEOUT;
+
+	setbits32(priv->reg + TALITOS_CCCR(ch), TALITOS_CCCR_RESET);
+
+	while ((in_be32(priv->reg + TALITOS_CCCR(ch)) & TALITOS_CCCR_RESET)
+	       && --timeout)
+		cpu_relax();
+
+	if (timeout == 0) {
+		dev_err(dev, "failed to reset channel %d\n", ch);
+		return -EIO;
+	}
+
+	/* set done writeback and IRQ */
+	setbits32(priv->reg + TALITOS_CCCR_LO(ch), TALITOS_CCCR_LO_CDWE |
+		  TALITOS_CCCR_LO_CDIE);
+
+	return 0;
+}
+
+static int reset_device(struct device *dev)
+{
+	struct talitos_private *priv = dev_get_drvdata(dev);
+	unsigned int timeout = TALITOS_TIMEOUT;
+
+	setbits32(priv->reg + TALITOS_MCR, TALITOS_MCR_SWR);
+
+	while ((in_be32(priv->reg + TALITOS_MCR) & TALITOS_MCR_SWR)
+	       && --timeout)
+		cpu_relax();
+
+	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;
+
+	/*
+	 * 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 */
+	setbits32(priv->reg + TALITOS_IMR, TALITOS_IMR_INIT);
+	setbits32(priv->reg + TALITOS_IMR_LO, TALITOS_IMR_LO_INIT);
+
+	return 0;
+}
+
+/**
+ * talitos_submit - submits a descriptor to the device for processing
+ * @dev:	the SEC device 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.
+ */
+static int talitos_submit(struct device *dev, 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, ch;
+	int head;
+
+	/* select done notification */
+	desc->hdr |= DESC_HDR_DONE_NOTIFY;
+
+	/* emulate SEC's round-robin channel fifo polling scheme */
+	ch = atomic_inc_return(&priv->last_chan) & (priv->num_channels - 1);
+
+	spin_lock_irqsave(&priv->head_lock[ch], flags);
+
+	head = priv->head[ch];
+	request = &priv->fifo[ch][head];
+
+	if (request->desc) {
+		/* request queue is full */
+		spin_unlock_irqrestore(&priv->head_lock[ch], flags);
+		return -EAGAIN;
+	}
+
+	/* map descriptor and save caller data */
+	request->dma_desc = dma_map_single(dev, desc, sizeof(*desc),
+					   DMA_BIDIRECTIONAL);
+	request->callback = callback;
+	request->context = context;
+
+	/* increment fifo head */
+	priv->head[ch] = (priv->head[ch] + 1) & (priv->fifo_len - 1);
+
+	smp_wmb();
+	request->desc = desc;
+
+	/* GO! */
+	wmb();
+	out_be32(priv->reg + TALITOS_FF_LO(ch), request->dma_desc);
+
+	spin_unlock_irqrestore(&priv->head_lock[ch], flags);
+
+	return -EINPROGRESS;
+}
+
+/*
+ * 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;
+
+	spin_lock_irqsave(&priv->tail_lock[ch], flags);
+
+	tail = priv->tail[ch];
+	while (priv->fifo[ch][tail].desc) {
+		request = &priv->fifo[ch][tail];
+
+		/* descriptors with their done bits set don't get the error */
+		rmb();
+		if ((request->desc->hdr & DESC_HDR_DONE) == DESC_HDR_DONE)
+			status = 0;
+		else
+			if (!error)
+				break;
+			else
+				status = error;
+
+		dma_unmap_single(dev, request->dma_desc,
+			sizeof(struct talitos_desc), 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->tail[ch] = (tail + 1) & (priv->fifo_len - 1);
+
+		spin_unlock_irqrestore(&priv->tail_lock[ch], flags);
+		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->tail_lock[ch], flags);
+		tail = priv->tail[ch];
+	}
+
+	spin_unlock_irqrestore(&priv->tail_lock[ch], flags);
+}
+
+/*
+ * process completed requests for channels that have done status
+ */
+static void talitos_done(unsigned long data)
+{
+	struct device *dev = (struct device *)data;
+	struct talitos_private *priv = dev_get_drvdata(dev);
+	int ch;
+
+	for (ch = 0; ch < priv->num_channels; ch++)
+		flush_channel(dev, ch, 0, 0);
+}
+
+/*
+ * locate current (offending) descriptor
+ */
+static struct talitos_desc *current_desc(struct device *dev, int ch)
+{
+	struct talitos_private *priv = dev_get_drvdata(dev);
+	int tail = priv->tail[ch];
+	dma_addr_t cur_desc;
+
+	cur_desc = in_be32(priv->reg + TALITOS_CDPR_LO(ch));
+
+	while (priv->fifo[ch][tail].dma_desc != cur_desc) {
+		tail = (tail + 1) & (priv->fifo_len - 1);
+		if (tail == priv->tail[ch]) {
+			dev_err(dev, "couldn't locate current descriptor\n");
+			return NULL;
+		}
+	}
+
+	return priv->fifo[ch][tail].desc;
+}
+
+/*
+ * user diagnostics; report root cause of error based on execution unit status
+ */
+static void report_eu_error(struct device *dev, int ch, struct talitos_desc *desc)
+{
+	struct talitos_private *priv = dev_get_drvdata(dev);
+	int i;
+
+	switch (desc->hdr & DESC_HDR_SEL0_MASK) {
+	case DESC_HDR_SEL0_AFEU:
+		dev_err(dev, "AFEUISR 0x%08x_%08x\n",
+			in_be32(priv->reg + TALITOS_AFEUISR),
+			in_be32(priv->reg + TALITOS_AFEUISR_LO));
+		break;
+	case DESC_HDR_SEL0_DEU:
+		dev_err(dev, "DEUISR 0x%08x_%08x\n",
+			in_be32(priv->reg + TALITOS_DEUISR),
+			in_be32(priv->reg + TALITOS_DEUISR_LO));
+		break;
+	case DESC_HDR_SEL0_MDEUA:
+	case DESC_HDR_SEL0_MDEUB:
+		dev_err(dev, "MDEUISR 0x%08x_%08x\n",
+			in_be32(priv->reg + TALITOS_MDEUISR),
+			in_be32(priv->reg + TALITOS_MDEUISR_LO));
+		break;
+	case DESC_HDR_SEL0_RNG:
+		dev_err(dev, "RNGUISR 0x%08x_%08x\n",
+			in_be32(priv->reg + TALITOS_RNGUISR),
+			in_be32(priv->reg + TALITOS_RNGUISR_LO));
+		break;
+	case DESC_HDR_SEL0_PKEU:
+		dev_err(dev, "PKEUISR 0x%08x_%08x\n",
+			in_be32(priv->reg + TALITOS_PKEUISR),
+			in_be32(priv->reg + TALITOS_PKEUISR_LO));
+		break;
+	case DESC_HDR_SEL0_AESU:
+		dev_err(dev, "AESUISR 0x%08x_%08x\n",
+			in_be32(priv->reg + TALITOS_AESUISR),
+			in_be32(priv->reg + TALITOS_AESUISR_LO));
+		break;
+	case DESC_HDR_SEL0_CRCU:
+		dev_err(dev, "CRCUISR 0x%08x_%08x\n",
+			in_be32(priv->reg + TALITOS_CRCUISR),
+			in_be32(priv->reg + TALITOS_CRCUISR_LO));
+		break;
+	case DESC_HDR_SEL0_KEU:
+		dev_err(dev, "KEUISR 0x%08x_%08x\n",
+			in_be32(priv->reg + TALITOS_KEUISR),
+			in_be32(priv->reg + TALITOS_KEUISR_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 + TALITOS_MDEUISR),
+			in_be32(priv->reg + TALITOS_MDEUISR_LO));
+		break;
+	case DESC_HDR_SEL1_CRCU:
+		dev_err(dev, "CRCUISR 0x%08x_%08x\n",
+			in_be32(priv->reg + TALITOS_CRCUISR),
+			in_be32(priv->reg + TALITOS_CRCUISR_LO));
+		break;
+	}
+
+	for (i = 0; i < 8; i++)
+		dev_err(dev, "DESCBUF 0x%08x_%08x\n",
+			in_be32(priv->reg + TALITOS_DESCBUF(ch) + 8*i),
+			in_be32(priv->reg + TALITOS_DESCBUF_LO(ch) + 8*i));
+}
+
+/*
+ * recover from error interrupts
+ */
+static void talitos_error(unsigned long data)
+{
+	struct device *dev = (struct device *)data;
+	struct talitos_private *priv = dev_get_drvdata(dev);
+	unsigned int timeout = TALITOS_TIMEOUT;
+	int ch, error, reset_dev = 0, reset_ch = 0;
+	u32 isr, isr_lo, v, v_lo;
+
+	isr = in_be32(priv->reg + TALITOS_ISR);
+	isr_lo = in_be32(priv->reg + TALITOS_ISR_LO);
+
+	for (ch = 0; ch < priv->num_channels; ch++) {
+		/* skip channels without errors */
+		if (!(isr & (1 << (ch * 2 + 1))))
+			continue;
+
+		error = -EINVAL;
+
+		v = in_be32(priv->reg + TALITOS_CCPSR(ch));
+		v_lo = in_be32(priv->reg + TALITOS_CCPSR_LO(ch));
+
+		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, "s/g data length zero error\n");
+		if (v_lo & TALITOS_CCPSR_LO_FPZ)
+			dev_err(dev, "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, "invalid execution unit error\n");
+		if (v_lo & TALITOS_CCPSR_LO_EU)
+			report_eu_error(dev, ch, current_desc(dev, ch));
+		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->reg + TALITOS_CCCR(ch),
+				  TALITOS_CCCR_CONT);
+			setbits32(priv->reg + TALITOS_CCCR_LO(ch), 0);
+			while ((in_be32(priv->reg + TALITOS_CCCR(ch)) &
+			       TALITOS_CCCR_CONT) && --timeout)
+				cpu_relax();
+			if (timeout == 0) {
+				dev_err(dev, "failed to restart channel %d\n",
+					ch);
+				reset_dev = 1;
+			}
+		}
+	}
+	if (reset_dev || isr & ~TALITOS_ISR_CHERR || isr_lo) {
+		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);
+	}
+}
+
+static irqreturn_t talitos_interrupt(int irq, void *data)
+{
+	struct device *dev = data;
+	struct talitos_private *priv = dev_get_drvdata(dev);
+	u32 isr, isr_lo;
+
+	isr = in_be32(priv->reg + TALITOS_ISR);
+	isr_lo = in_be32(priv->reg + TALITOS_ISR_LO);
+
+	/* ack */
+	out_be32(priv->reg + TALITOS_ICR, isr);
+	out_be32(priv->reg + TALITOS_ICR_LO, isr_lo);
+
+	if (unlikely((isr & ~TALITOS_ISR_CHDONE) || isr_lo))
+		talitos_error((unsigned long)data);
+	else
+		if (likely(isr & TALITOS_ISR_CHDONE))
+			tasklet_schedule(&priv->done_task);
+
+	return (isr || isr_lo) ? IRQ_HANDLED : IRQ_NONE;
+}
+
+/*
+ * 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 + TALITOS_RNGUSR_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 + TALITOS_RNGU_FIFO);
+	*data = in_be32(priv->reg + TALITOS_RNGU_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 + TALITOS_RNGURCR_LO, TALITOS_RNGURCR_LO_SR);
+	while (!(in_be32(priv->reg + TALITOS_RNGUSR_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 + TALITOS_RNGUDSR_LO, 0);
+
+	return 0;
+}
+
+static int talitos_register_rng(struct device *dev)
+{
+	struct talitos_private *priv = dev_get_drvdata(dev);
+
+	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;
+
+	return hwrng_register(&priv->rng);
+}
+
+static void talitos_unregister_rng(struct device *dev)
+{
+	struct talitos_private *priv = dev_get_drvdata(dev);
+
+	hwrng_unregister(&priv->rng);
+}
+
+/*
+ * crypto alg
+ */
+#define TALITOS_CRA_PRIORITY		3000
+#define TALITOS_MAX_KEY_SIZE		64
+#define TALITOS_MAX_AUTH_SIZE		20
+#define TALITOS_AES_MIN_BLOCK_SIZE	16
+#define TALITOS_AES_IV_LENGTH		16
+
+struct talitos_ctx {
+	struct device *dev;
+	__be32 desc_hdr_template;
+	u8 key[TALITOS_MAX_KEY_SIZE];
+	u8 iv[TALITOS_AES_IV_LENGTH];
+	unsigned int keylen;
+	unsigned int enckeylen;
+	unsigned int authkeylen;
+	unsigned int authsize;
+};
+
+static int aes_cbc_sha1_hmac_authenc_setauthsize(struct crypto_aead *authenc,
+						 unsigned int authsize)
+{
+	struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
+
+	ctx->authsize = authsize;
+
+	return 0;
+}
+
+static int aes_cbc_sha1_hmac_authenc_setkey(struct crypto_aead *authenc,
+					    const u8 *key, unsigned int keylen)
+{
+	struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
+	struct rtattr *rta = (void *)key;
+	struct crypto_authenc_key_param *param;
+	unsigned int authkeylen;
+	unsigned int enckeylen;
+
+	if (!RTA_OK(rta, keylen))
+		goto badkey;
+
+	if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
+		goto badkey;
+
+	if (RTA_PAYLOAD(rta) < sizeof(*param))
+		goto badkey;
+
+	param = RTA_DATA(rta);
+	enckeylen = be32_to_cpu(param->enckeylen);
+
+	key += RTA_ALIGN(rta->rta_len);
+	keylen -= RTA_ALIGN(rta->rta_len);
+
+	if (keylen < enckeylen)
+		goto badkey;
+
+	authkeylen = keylen - enckeylen;
+
+	if (keylen > TALITOS_MAX_KEY_SIZE)
+		goto badkey;
+
+	memcpy(&ctx->key, key, keylen);
+
+	ctx->keylen = keylen;
+	ctx->enckeylen = enckeylen;
+	ctx->authkeylen = authkeylen;
+
+	return 0;
+
+badkey:
+	crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
+	return -EINVAL;
+}
+
+/*
+ * ipsec_esp_edesc - s/w-extended ipsec_esp descriptor
+ * @src_nents: number of segments in input scatterlist
+ * @dst_nents: number of segments in output scatterlist
+ * @dma_len: length of dma mapped link_tbl space
+ * @dma_link_tbl: bus physical address of link_tbl
+ * @desc: h/w descriptor
+ * @link_tbl: input and output h/w link tables (if {src,dst}_nents > 1)
+ *
+ * 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 ipsec_esp_edesc {
+	int src_nents;
+	int dst_nents;
+	int dma_len;
+	dma_addr_t dma_link_tbl;
+	struct talitos_desc desc;
+	struct talitos_ptr link_tbl[0];
+};
+
+static void ipsec_esp_unmap(struct device *dev,
+			    struct ipsec_esp_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);
+
+	dma_unmap_sg(dev, areq->assoc, 1, DMA_TO_DEVICE);
+
+	if (areq->src != areq->dst) {
+		dma_unmap_sg(dev, areq->src, edesc->src_nents ? : 1,
+			     DMA_TO_DEVICE);
+		dma_unmap_sg(dev, areq->dst, edesc->dst_nents ? : 1,
+			     DMA_FROM_DEVICE);
+	} else {
+		dma_unmap_sg(dev, areq->src, edesc->src_nents ? : 1,
+			     DMA_BIDIRECTIONAL);
+	}
+
+	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 ipsec_esp_edesc *edesc =
+		 container_of(desc, struct ipsec_esp_edesc, desc);
+	struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
+	struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
+	struct scatterlist *sg;
+	void *icvdata;
+
+	ipsec_esp_unmap(dev, edesc, areq);
+
+	/* copy the generated ICV to dst */
+	if (edesc->dma_len) {
+		icvdata = &edesc->link_tbl[edesc->src_nents +
+					   edesc->dst_nents + 1];
+		sg = sg_last(areq->dst, edesc->dst_nents);
+		memcpy((char *)sg_virt(sg) + sg->length - ctx->authsize,
+		       icvdata, ctx->authsize);
+	}
+
+	kfree(edesc);
+
+	aead_request_complete(areq, err);
+}
+
+static void ipsec_esp_decrypt_done(struct device *dev,
+				   struct talitos_desc *desc, void *context,
+				   int err)
+{
+	struct aead_request *req = context;
+	struct ipsec_esp_edesc *edesc =
+		 container_of(desc, struct ipsec_esp_edesc, desc);
+	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+	struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
+	struct scatterlist *sg;
+	void *icvdata;
+
+	ipsec_esp_unmap(dev, edesc, req);
+
+	if (!err) {
+		/* auth check */
+		if (edesc->dma_len)
+			icvdata = &edesc->link_tbl[edesc->src_nents +
+						   edesc->dst_nents + 1];
+		else
+			icvdata = &edesc->link_tbl[0];
+
+		sg = sg_last(req->dst, edesc->dst_nents ? : 1);
+		err = memcmp(icvdata, (char *)sg_virt(sg) + sg->length -
+			     ctx->authsize, ctx->authsize) ? -EBADMSG : 0;
+	}
+
+	kfree(edesc);
+
+	aead_request_complete(req, err);
+}
+
+/*
+ * convert scatterlist to SEC h/w link table format
+ * stop at cryptlen bytes
+ */
+static void sg_to_link_tbl(struct scatterlist *sg, int sg_count,
+			   int cryptlen, struct talitos_ptr *link_tbl_ptr)
+{
+	while (cryptlen > 0) {
+		link_tbl_ptr->ptr = cpu_to_be32(sg_dma_address(sg));
+		link_tbl_ptr->len = cpu_to_be16(sg_dma_len(sg));
+		link_tbl_ptr->j_extent = 0;
+		link_tbl_ptr++;
+		cryptlen -= sg_dma_len(sg);
+		sg = sg_next(sg);
+	}
+
+	/* adjust (decrease) last entry's len to cryptlen */
+	link_tbl_ptr--;
+	link_tbl_ptr->len = cpu_to_be16(be16_to_cpu(link_tbl_ptr->len)
+					+ cryptlen);
+
+	/* tag end of link table */
+	link_tbl_ptr->j_extent = DESC_PTR_LNKTBL_RETURN;
+}
+
+/*
+ * fill in and submit ipsec_esp descriptor
+ */
+static int ipsec_esp(struct ipsec_esp_edesc *edesc, struct aead_request *areq,
+		     u8 *giv, u64 seq,
+		     void (*callback) (struct device *dev,
+				       struct talitos_desc *desc,
+				       void *context, int error))
+{
+	struct crypto_aead *aead = crypto_aead_reqtfm(areq);
+	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 authsize = ctx->authsize;
+	unsigned int ivsize;
+	int sg_count;
+
+	/* hmac key */
+	map_single_talitos_ptr(dev, &desc->ptr[0], ctx->authkeylen, &ctx->key,
+			       0, DMA_TO_DEVICE);
+	/* hmac data */
+	map_single_talitos_ptr(dev, &desc->ptr[1], sg_virt(areq->src) -
+			       sg_virt(areq->assoc), sg_virt(areq->assoc), 0,
+			       DMA_TO_DEVICE);
+	/* cipher iv */
+	ivsize = crypto_aead_ivsize(aead);
+	map_single_talitos_ptr(dev, &desc->ptr[2], ivsize, giv ?: areq->iv, 0,
+			       DMA_TO_DEVICE);
+
+	/* cipher key */
+	map_single_talitos_ptr(dev, &desc->ptr[3], ctx->enckeylen,
+			       (char *)&ctx->key + ctx->authkeylen, 0,
+			       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;
+
+	if (areq->src == areq->dst)
+		sg_count = dma_map_sg(dev, areq->src, edesc->src_nents ? : 1,
+				      DMA_BIDIRECTIONAL);
+	else
+		sg_count = dma_map_sg(dev, areq->src, edesc->src_nents ? : 1,
+				      DMA_TO_DEVICE);
+
+	if (sg_count == 1) {
+		desc->ptr[4].ptr = cpu_to_be32(sg_dma_address(areq->src));
+	} else {
+		sg_to_link_tbl(areq->src, sg_count, cryptlen,
+			       &edesc->link_tbl[0]);
+		desc->ptr[4].j_extent |= DESC_PTR_LNKTBL_JUMP;
+		desc->ptr[4].ptr = cpu_to_be32(edesc->dma_link_tbl);
+		dma_sync_single_for_device(ctx->dev, edesc->dma_link_tbl,
+					   edesc->dma_len, DMA_BIDIRECTIONAL);
+	}
+
+	/* 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);
+	}
+
+	if (sg_count == 1) {
+		desc->ptr[5].ptr = cpu_to_be32(sg_dma_address(areq->dst));
+	} else {
+		struct talitos_ptr *link_tbl_ptr =
+			&edesc->link_tbl[edesc->src_nents];
+		struct scatterlist *sg;
+
+		desc->ptr[5].ptr = cpu_to_be32((struct talitos_ptr *)
+					       edesc->dma_link_tbl +
+					       edesc->src_nents);
+		if (areq->src == areq->dst) {
+			memcpy(link_tbl_ptr, &edesc->link_tbl[0],
+			       edesc->src_nents * sizeof(struct talitos_ptr));
+		} else {
+			sg_to_link_tbl(areq->dst, sg_count, cryptlen,
+				       link_tbl_ptr);
+		}
+		link_tbl_ptr += sg_count - 1;
+
+		/* handle case where sg_last contains the ICV exclusively */
+		sg = sg_last(areq->dst, edesc->dst_nents);
+		if (sg->length == ctx->authsize)
+			link_tbl_ptr--;
+
+		link_tbl_ptr->j_extent = 0;
+		link_tbl_ptr++;
+		link_tbl_ptr->j_extent = DESC_PTR_LNKTBL_RETURN;
+		link_tbl_ptr->len = cpu_to_be16(authsize);
+
+		/* icv data follows link tables */
+		link_tbl_ptr->ptr = cpu_to_be32((struct talitos_ptr *)
+						edesc->dma_link_tbl +
+					        edesc->src_nents +
+						edesc->dst_nents + 1);
+
+		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);
+	}
+
+	/* iv out */
+	map_single_talitos_ptr(dev, &desc->ptr[6], ivsize, ctx->iv, 0,
+			       DMA_FROM_DEVICE);
+
+	return talitos_submit(dev, desc, callback, areq);
+}
+
+
+/*
+ * derive number of elements in scatterlist
+ */
+static int sg_count(struct scatterlist *sg_list, int nbytes)
+{
+	struct scatterlist *sg = sg_list;
+	int sg_nents = 0;
+
+	while (nbytes) {
+		sg_nents++;
+		nbytes -= sg->length;
+		sg = sg_next(sg);
+	}
+
+	return sg_nents;
+}
+
+/*
+ * allocate and map the ipsec_esp extended descriptor
+ */
+static struct ipsec_esp_edesc *ipsec_esp_edesc_alloc(struct aead_request *areq,
+						     int icv_stashing)
+{
+	struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
+	struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
+	struct ipsec_esp_edesc *edesc;
+	int src_nents, dst_nents, alloc_len, dma_len;
+
+	if (areq->cryptlen + ctx->authsize > TALITOS_MAX_DATA_LEN) {
+		dev_err(ctx->dev, "cryptlen exceeds h/w max limit\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	src_nents = sg_count(areq->src, areq->cryptlen + ctx->authsize);
+	src_nents = (src_nents == 1) ? 0 : src_nents;
+
+	if (areq->dst == areq->src) {
+		dst_nents = src_nents;
+	} else {
+		dst_nents = sg_count(areq->dst, areq->cryptlen + ctx->authsize);
+		dst_nents = (dst_nents == 1) ? 0 : src_nents;
+	}
+
+	/*
+	 * allocate space for base edesc plus the link tables,
+	 * allowing for a separate entry for the generated ICV (+ 1),
+	 * and the ICV data itself
+	 */
+	alloc_len = sizeof(struct ipsec_esp_edesc);
+	if (src_nents || dst_nents) {
+		dma_len = (src_nents + dst_nents + 1) *
+				 sizeof(struct talitos_ptr) + ctx->authsize;
+		alloc_len += dma_len;
+	} else {
+		dma_len = 0;
+		alloc_len += icv_stashing ? ctx->authsize : 0;
+	}
+
+	edesc = kmalloc(alloc_len, GFP_DMA);
+	if (!edesc) {
+		dev_err(ctx->dev, "could not allocate edescriptor\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	edesc->src_nents = src_nents;
+	edesc->dst_nents = dst_nents;
+	edesc->dma_len = dma_len;
+	edesc->dma_link_tbl = dma_map_single(ctx->dev, &edesc->link_tbl[0],
+					     edesc->dma_len, DMA_BIDIRECTIONAL);
+
+	return edesc;
+}
+
+static int aes_cbc_sha1_hmac_authenc_encrypt(struct aead_request *req)
+{
+	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+	struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
+	struct ipsec_esp_edesc *edesc;
+
+	/* allocate extended descriptor */
+	edesc = ipsec_esp_edesc_alloc(req, 0);
+	if (IS_ERR(edesc))
+		return PTR_ERR(edesc);
+
+	/* set encrypt */
+	edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_MODE0_AESU_ENC;
+
+	return ipsec_esp(edesc, req, NULL, 0, ipsec_esp_encrypt_done);
+}
+
+static int aes_cbc_sha1_hmac_authenc_decrypt(struct aead_request *req)
+{
+	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+	struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
+	unsigned int authsize = ctx->authsize;
+	struct ipsec_esp_edesc *edesc;
+	struct scatterlist *sg;
+	void *icvdata;
+
+	req->cryptlen -= authsize;
+
+	/* allocate extended descriptor */
+	edesc = ipsec_esp_edesc_alloc(req, 1);
+	if (IS_ERR(edesc))
+		return PTR_E