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Date:	Thu, 22 May 2014 17:09:56 +0200
From:	LABBE Corentin <clabbe.montjoie@...il.com>
To:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	rdunlap@...radead.org, maxime.ripard@...e-electrons.com,
	linux@....linux.org.uk, herbert@...dor.apana.org.au,
	davem@...emloft.net, grant.likely@...aro.org
Cc:	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	LABBE Corentin <clabbe.montjoie@...il.com>
Subject: [PATCH 3/3] crypto: Add Allwinner Security System crypto accelerator

Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
---
 drivers/crypto/Kconfig    |   49 ++
 drivers/crypto/Makefile   |    1 +
 drivers/crypto/sunxi-ss.c | 1476 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1526 insertions(+)
 create mode 100644 drivers/crypto/sunxi-ss.c

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 03ccdb0..5ea0922 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -418,4 +418,53 @@ config CRYPTO_DEV_MXS_DCP
 	  To compile this driver as a module, choose M here: the module
 	  will be called mxs-dcp.
 
+config CRYPTO_DEV_SUNXI_SS
+        tristate "Support for Allwinner Security System cryptographic accelerator"
+        depends on ARCH_SUNXI
+        help
+          Some Allwinner processors have a crypto accelerator named
+          Security System. Select this if you want to use it.
+
+          To compile this driver as a module, choose M here: the module
+          will be called sunxi-ss.
+
+if CRYPTO_DEV_SUNXI_SS
+config CRYPTO_DEV_SUNXI_SS_PRNG
+	bool "Security System PRNG"
+	select CRYPTO_RNG2
+	help
+	  If you enable this option, the SS will provide a pseudo random
+	  number generator.
+config CRYPTO_DEV_SUNXI_SS_MD5
+	bool "Security System MD5"
+	select CRYPTO_MD5
+	help
+	  If you enable this option, the SS will provide MD5 hardware
+	  acceleration.
+config CRYPTO_DEV_SUNXI_SS_SHA1
+	bool "Security System SHA1"
+	select CRYPTO_SHA1
+	help
+	  If you enable this option, the SS will provide SHA1 hardware
+	  acceleration.
+config CRYPTO_DEV_SUNXI_SS_AES
+	bool "Security System AES"
+	select CRYPTO_AES
+	help
+	  If you enable this option, the SS will provide AES hardware
+	  acceleration.
+config CRYPTO_DEV_SUNXI_SS_DES
+	bool "Security System DES"
+	select CRYPTO_DES
+	help
+	  If you enable this option, the SS will provide DES hardware
+	  acceleration.
+config CRYPTO_DEV_SUNXI_SS_3DES
+	bool "Security System 3DES"
+	select CRYPTO_DES
+	help
+	  If you enable this option, the SS will provide 3DES hardware
+	  acceleration.
+endif #CRYPTO_DEV_SUNXI_SS
+
 endif # CRYPTO_HW
diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
index 482f090..490dae5 100644
--- a/drivers/crypto/Makefile
+++ b/drivers/crypto/Makefile
@@ -23,3 +23,4 @@ obj-$(CONFIG_CRYPTO_DEV_S5P) += s5p-sss.o
 obj-$(CONFIG_CRYPTO_DEV_SAHARA) += sahara.o
 obj-$(CONFIG_CRYPTO_DEV_TALITOS) += talitos.o
 obj-$(CONFIG_CRYPTO_DEV_UX500) += ux500/
+obj-$(CONFIG_CRYPTO_DEV_SUNXI_SS) += sunxi-ss.o
diff --git a/drivers/crypto/sunxi-ss.c b/drivers/crypto/sunxi-ss.c
new file mode 100644
index 0000000..bbf57bc
--- /dev/null
+++ b/drivers/crypto/sunxi-ss.c
@@ -0,0 +1,1476 @@
+/*
+ * sunxi-ss.c - hardware cryptographic accelerator for Allwinner A20 SoC
+ *
+ * Copyright (C) 2013-2014 Corentin LABBE <clabbe.montjoie@...il.com>
+ *
+ * Support AES cipher with 128,192,256 bits keysize.
+ * Support MD5 and SHA1 hash algorithms.
+ * Support DES and 3DES
+ * Support PRNG
+ *
+ * You could find the datasheet at
+ * http://dl.linux-sunxi.org/A20/A20%20User%20Manual%202013-03-22.pdf
+ *
+ *
+ * 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 version 2 of the License
+ */
+
+#include <linux/clk.h>
+#include <linux/crypto.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <crypto/scatterwalk.h>
+#include <linux/scatterlist.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_MD5
+#include <crypto/md5.h>
+#define SUNXI_SS_HASH_COMMON
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_SHA1
+#include <crypto/sha.h>
+#define SUNXI_SS_HASH_COMMON
+#endif
+#ifdef SUNXI_SS_HASH_COMMON
+#include <crypto/hash.h>
+#include <crypto/internal/hash.h>
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_AES
+#include <crypto/aes.h>
+#endif
+
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_3DES
+#define SUNXI_SS_DES
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_DES
+#define SUNXI_SS_DES
+#endif
+#ifdef SUNXI_SS_DES
+#include <crypto/des.h>
+#endif
+
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_PRNG
+#include <crypto/internal/rng.h>
+
+struct prng_context {
+	u8 seed[192/8];
+	unsigned int slen;
+};
+#endif
+
+#define SUNXI_SS_CTL            0x00
+#define SUNXI_SS_KEY0           0x04
+#define SUNXI_SS_KEY1           0x08
+#define SUNXI_SS_KEY2           0x0C
+#define SUNXI_SS_KEY3           0x10
+#define SUNXI_SS_KEY4           0x14
+#define SUNXI_SS_KEY5           0x18
+#define SUNXI_SS_KEY6           0x1C
+#define SUNXI_SS_KEY7           0x20
+
+#define SUNXI_SS_IV0            0x24
+#define SUNXI_SS_IV1            0x28
+#define SUNXI_SS_IV2            0x2C
+#define SUNXI_SS_IV3            0x30
+
+#define SUNXI_SS_CNT0           0x34
+#define SUNXI_SS_CNT1           0x38
+#define SUNXI_SS_CNT2           0x3C
+#define SUNXI_SS_CNT3           0x40
+
+#define SUNXI_SS_FCSR           0x44
+#define SUNXI_SS_ICSR           0x48
+
+#define SUNXI_SS_MD0            0x4C
+#define SUNXI_SS_MD1            0x50
+#define SUNXI_SS_MD2            0x54
+#define SUNXI_SS_MD3            0x58
+#define SUNXI_SS_MD4            0x5C
+
+#define SS_RXFIFO         0x200
+#define SS_TXFIFO         0x204
+
+/* SUNXI_SS_CTL configuration values */
+
+/* AES/DES/3DES key select - bits 24-27 */
+#define SUNXI_SS_KEYSELECT_KEYN		(0 << 24)
+
+/* PRNG generator mode - bit 15 */
+#define SUNXI_PRNG_ONESHOT              (0 << 15)
+#define SUNXI_PRNG_CONTINUE             (1 << 15)
+
+/* IV Steady of SHA-1/MD5 constants - bit 14 */
+#define SUNXI_SS_IV_CONSTANTS              (0 << 14)
+#define SUNXI_IV_ARBITRARY              (1 << 14)
+
+/* SS operation mode - bits 12-13 */
+#define SUNXI_SS_ECB                    (0 << 12)
+#define SUNXI_SS_CBC                    (1 << 12)
+#define SUNXI_SS_CNT                    (2 << 12)
+
+/* Counter width for CNT mode - bits 10-11 */
+#define SUNXI_CNT_16BITS                (0 << 10)
+#define SUNXI_CNT_32BITS                (1 << 10)
+#define SUNXI_CNT_64BITS                (2 << 10)
+
+/* Key size for AES - bits 8-9 */
+#define SUNXI_AES_128BITS               (0 << 8)
+#define SUNXI_AES_192BITS               (1 << 8)
+#define SUNXI_AES_256BITS               (2 << 8)
+
+/* Operation direction - bit 7 */
+#define SUNXI_SS_ENCRYPTION             (0 << 7)
+#define SUNXI_SS_DECRYPTION             (1 << 7)
+
+/* SS Method - bits 4-6 */
+#define SUNXI_OP_AES                    (0 << 4)
+#define SUNXI_OP_DES                    (1 << 4)
+#define SUNXI_OP_3DES                   (2 << 4)
+#define SUNXI_OP_SHA1                   (3 << 4)
+#define SUNXI_OP_MD5                    (4 << 4)
+#define SUNXI_OP_PRNG                   (5 << 4)
+
+/* Data end bit - bit 2 */
+#define SUNXI_SS_DATA_END               BIT(2)
+
+/* PRNG start bit - bit 1 */
+#define SUNXI_PRNG_START                BIT(1)
+
+/* SS Enable bit - bit 0 */
+#define SUNXI_SS_DISABLED               (0 << 0)
+#define SUNXI_SS_ENABLED                (1 << 0)
+
+/* RX FIFO status - bit 30 */
+#define SS_RXFIFO_FREE               BIT(30)
+
+/* RX FIFO empty spaces - bits 24-29 */
+#define SS_RXFIFO_SPACES(val)        (((val) >> 24) & 0x3f)
+
+/* TX FIFO status - bit 22 */
+#define SS_TXFIFO_AVAILABLE          BIT(22)
+
+/* TX FIFO available spaces - bits 16-21 */
+#define SS_TXFIFO_SPACES(val)        (((val) >> 16) & 0x3f)
+
+#define SUNXI_RXFIFO_EMP_INT_PENDING    BIT(10)
+#define SUNXI_TXFIFO_AVA_INT_PENDING    BIT(8)
+#define SUNXI_RXFIFO_EMP_INT_ENABLE     BIT(2)
+#define SUNXI_TXFIFO_AVA_INT_ENABLE     BIT(0)
+
+#define SUNXI_SS_ICS_DRQ_ENABLE         BIT(4)
+
+/* General notes:
+ * I cannot use a key/IV cache because each time one of these change ALL stuff
+ * need to be re-writed.
+ * And for example, with dm-crypt IV changes on each request.
+ *
+ * After each request the device must be disabled.
+ *
+ * For performance reason, we use writel_relaxed/read_relaxed for all
+ * operations on RX and TX FIFO.
+ * For all other registers, we use writel.
+ * See http://permalink.gmane.org/gmane.linux.ports.arm.kernel/117644
+ * and http://permalink.gmane.org/gmane.linux.ports.arm.kernel/117640
+ * */
+
+static struct sunxi_ss_ctx {
+	void *base;
+	int irq;
+	struct clk *busclk;
+	struct clk *ssclk;
+	struct device *dev;
+	struct resource *res;
+	void *buf_in; /* pointer to data to be uploaded to the device */
+	size_t buf_in_size; /* size of buf_in */
+	void *buf_out;
+	size_t buf_out_size;
+} _ss_ctx, *ss_ctx = &_ss_ctx;
+
+static DEFINE_MUTEX(lock);
+static DEFINE_MUTEX(bufout_lock);
+static DEFINE_MUTEX(bufin_lock);
+
+struct sunxi_req_ctx {
+	u8 key[AES_MAX_KEY_SIZE * 8];
+	u32 keylen;
+	u32 mode;
+	u64 byte_count; /* number of bytes "uploaded" to the device */
+	u32 waitbuf; /* a partial word waiting to be completed and
+			uploaded to the device */
+	/* number of bytes to be uploaded in the waitbuf word */
+	unsigned int nbwait;
+};
+
+#ifdef SUNXI_SS_HASH_COMMON
+/*============================================================================*/
+/*============================================================================*/
+/* sunxi_hash_init: initialize request context
+ * Activate the SS, and configure it for MD5 or SHA1
+ */
+static int sunxi_shash_init(struct shash_desc *desc)
+{
+	const char *hash_type;
+	struct sunxi_req_ctx *op = crypto_shash_ctx(desc->tfm);
+	u32 tmp = SUNXI_SS_ENABLED | SUNXI_SS_IV_CONSTANTS;
+
+	mutex_lock(&lock);
+
+	hash_type = crypto_tfm_alg_name(crypto_shash_tfm(desc->tfm));
+
+	op->byte_count = 0;
+	op->nbwait = 0;
+	op->waitbuf = 0;
+
+	/* Enable and configure SS for MD5 or SHA1 */
+	if (strcmp(hash_type, "sha1") == 0) {
+		tmp |= SUNXI_OP_SHA1;
+		op->mode = SUNXI_OP_SHA1;
+	} else {
+		tmp |= SUNXI_OP_MD5;
+		op->mode = SUNXI_OP_MD5;
+	}
+
+	writel(tmp, ss_ctx->base + SUNXI_SS_CTL);
+	return 0;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+/*
+ * sunxi_hash_update: update hash engine
+ *
+ * Could be used for both SHA1 and MD5
+ * Write data by step of 32bits and put then in the SS.
+ * The remaining data is stored (nbwait bytes) in op->waitbuf
+ * As an optimisation, we do not check RXFIFO_SPACES, since SS handle
+ * the FIFO faster than our writes
+ */
+static int sunxi_shash_update(struct shash_desc *desc,
+		const u8 *data, unsigned int length)
+{
+	u32 v;
+	unsigned int i = 0;
+	struct sunxi_req_ctx *op = crypto_shash_ctx(desc->tfm);
+
+	u8 *waitbuf = (u8 *)(&op->waitbuf);
+
+	if (length == 0)
+		return 0;
+
+	if (op->nbwait > 0) {
+		for (; op->nbwait < 4 && i < length; op->nbwait++) {
+			waitbuf[op->nbwait] = *(data + i);
+			i++;
+		}
+		if (op->nbwait == 4) {
+			writel(op->waitbuf, ss_ctx->base + SS_RXFIFO);
+			op->byte_count += 4;
+			op->nbwait = 0;
+			op->waitbuf = 0;
+		}
+	}
+	/* TODO bench this optim */
+	if (i == 0 && ((length - i) % 4) == 0) {
+		u32 *src32 = (u32 *)(data + i);
+		i = (length - i) / 4;
+		while (i > 0) {
+			writel_relaxed(*src32++, ss_ctx->base + SS_RXFIFO);
+			i--;
+		}
+		op->byte_count += length;
+		return 0;
+	}
+	while (length - i >= 4) {
+		v = *(u32 *)(data + i);
+		writel_relaxed(v, ss_ctx->base + SS_RXFIFO);
+		i += 4;
+		op->byte_count += 4;
+	}
+	/* if we have less than 4 bytes, copy them in waitbuf */
+	if (i < length && length - i < 4) {
+		do {
+			waitbuf[op->nbwait] = *(data + i + op->nbwait);
+			op->nbwait++;
+		} while (i + op->nbwait < length);
+	}
+
+	return 0;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+/*
+ * sunxi_hash_final: finalize hashing operation
+ *
+ * If we have some remaining bytes, send it.
+ * Then ask the SS for finalizing the hash
+ */
+static int sunxi_shash_final(struct shash_desc *desc, u8 *out)
+{
+	u32 v;
+	unsigned int i;
+	int zeros;
+	unsigned int index, padlen;
+	__be64 bits;
+	struct sunxi_req_ctx *op = crypto_shash_ctx(desc->tfm);
+
+	if (op->nbwait > 0) {
+		op->waitbuf |= ((1 << 7) << (op->nbwait * 8));
+		writel(op->waitbuf, ss_ctx->base + SS_RXFIFO);
+	} else {
+		writel((1 << 7), ss_ctx->base + SS_RXFIFO);
+	}
+
+	/* number of space to pad to obtain 64o minus 8(size) minus 4 (final 1)
+	 * example len=0
+	 * example len=56
+	 * */
+
+	/* we have already send 4 more byte of which nbwait data */
+	if (op->mode == SUNXI_OP_MD5) {
+		index = (op->byte_count + 4) & 0x3f;
+		op->byte_count += op->nbwait;
+		if (index > 56)
+			zeros = (120 - index) / 4;
+		else
+			zeros = (56 - index) / 4;
+	} else {
+		op->byte_count += op->nbwait;
+		index = op->byte_count & 0x3f;
+		padlen = (index < 56) ? (56 - index) : ((64+56) - index);
+		zeros = (padlen - 1) / 4;
+	}
+#ifdef DEBUG
+	/* This should not happen, TODO set a unlikely() ? */
+	if (zeros > 64 || zeros < 0) {
+		dev_err(ss_ctx->dev, "ERROR: too many zeros len=%llu\n",
+			op->byte_count);
+		zeros = 0;
+	}
+#endif
+	for (i = 0; i < zeros; i++)
+		writel(0, ss_ctx->base + SS_RXFIFO);
+
+	/* write the lenght */
+	if (op->mode == SUNXI_OP_SHA1) {
+		bits = cpu_to_be64(op->byte_count << 3);
+		writel(bits & 0xffffffff, ss_ctx->base + SS_RXFIFO);
+		writel((bits >> 32) & 0xffffffff,
+		       ss_ctx->base + SS_RXFIFO);
+	} else {
+		writel((op->byte_count << 3) & 0xffffffff,
+				ss_ctx->base + SS_RXFIFO);
+		writel((op->byte_count >> 29) & 0xffffffff,
+				ss_ctx->base + SS_RXFIFO);
+	}
+
+	/* stop the hashing */
+	v = readl(ss_ctx->base + SUNXI_SS_CTL);
+	v |= SUNXI_SS_DATA_END;
+	writel(v, ss_ctx->base + SUNXI_SS_CTL);
+
+	/* check the end */
+	/* The timeout could happend only in case of bad overcloking */
+#define SUNXI_SS_TIMEOUT 100
+	i = 0;
+	do {
+		v = readl(ss_ctx->base + SUNXI_SS_CTL);
+		i++;
+	} while (i < SUNXI_SS_TIMEOUT && (v & SUNXI_SS_DATA_END) > 0);
+	if (i >= SUNXI_SS_TIMEOUT) {
+		dev_err(ss_ctx->dev, "ERROR: hash end timeout %d>%d\n",
+				i, SUNXI_SS_TIMEOUT);
+		writel(0, ss_ctx->base + SUNXI_SS_CTL);
+		mutex_unlock(&lock);
+		return -1;
+	}
+
+	if (op->mode == SUNXI_OP_SHA1) {
+		for (i = 0; i < 5; i++) {
+			v = cpu_to_be32(readl(ss_ctx->base +
+						SUNXI_SS_MD0 + i * 4));
+			memcpy(out + i * 4, &v, 4);
+		}
+	} else {
+		for (i = 0; i < 4; i++) {
+			v = readl(ss_ctx->base + SUNXI_SS_MD0 + i * 4);
+			memcpy(out + i * 4, &v, 4);
+		}
+	}
+	writel(0, ss_ctx->base + SUNXI_SS_CTL);
+	mutex_unlock(&lock);
+	return 0;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+/* sunxi_hash_finup: finalize hashing operation after an update */
+static int sunxi_shash_finup(struct shash_desc *desc, const u8 *in,
+		unsigned int count, u8 *out)
+{
+	int err;
+
+	err = sunxi_shash_update(desc, in, count);
+	if (err != 0)
+		return err;
+
+	return sunxi_shash_final(desc, out);
+}
+
+/*============================================================================*/
+/*============================================================================*/
+/* combo of init/update/final functions */
+static int sunxi_shash_digest(struct shash_desc *desc, const u8 *in,
+		unsigned int count, u8 *out)
+{
+	int err;
+
+	err = sunxi_shash_init(desc);
+	if (err != 0)
+		return err;
+
+	err = sunxi_shash_update(desc, in, count);
+	if (err != 0)
+		return err;
+
+	return sunxi_shash_final(desc, out);
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static struct shash_alg sunxi_md5_alg = {
+	.init = sunxi_shash_init,
+	.update = sunxi_shash_update,
+	.final = sunxi_shash_final,
+	.finup = sunxi_shash_finup,
+	.digest = sunxi_shash_digest,
+	.digestsize = MD5_DIGEST_SIZE,
+	.base = {
+		.cra_name = "md5",
+		.cra_driver_name = "md5-sunxi-ss",
+		.cra_priority = 300,
+		.cra_alignmask = 3,
+		.cra_flags = CRYPTO_ALG_TYPE_SHASH,
+		.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
+		.cra_ctxsize = sizeof(struct sunxi_req_ctx),
+		.cra_module = THIS_MODULE,
+	}
+};
+
+static struct shash_alg sunxi_sha1_alg = {
+	.init = sunxi_shash_init,
+	.update = sunxi_shash_update,
+	.final = sunxi_shash_final,
+	.finup = sunxi_shash_finup,
+	.digest = sunxi_shash_digest,
+	.digestsize = SHA1_DIGEST_SIZE,
+	.base = {
+		.cra_name = "sha1",
+		.cra_driver_name = "sha1-sunxi-ss",
+		.cra_priority = 300,
+		.cra_alignmask = 3,
+		.cra_flags = CRYPTO_ALG_TYPE_SHASH,
+		.cra_ctxsize = sizeof(struct sunxi_req_ctx),
+		.cra_module = THIS_MODULE,
+	}
+};
+#endif /* ifdef SUNXI_SS_HASH_COMMON */
+
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_AES
+/*============================================================================*/
+/*============================================================================*/
+static int sunxi_aes_poll(struct blkcipher_desc *desc,
+		struct scatterlist *dst, struct scatterlist *src,
+		const unsigned int nbytes, const u32 flag)
+{
+	u32 tmp;
+	struct sunxi_req_ctx *op = crypto_blkcipher_ctx(desc->tfm);
+	u32 rx_cnt = 32; /* when activating SS, the default FIFO space is 32 */
+	u32 tx_cnt = 0;
+	u32 v;
+	int i;
+	struct scatterlist *in_sg;
+	struct scatterlist *out_sg;
+	void *src_addr;
+	void *dst_addr;
+	unsigned int ileft = nbytes;
+	unsigned int oleft = nbytes;
+	unsigned int sgileft = src->length;
+	unsigned int sgoleft = dst->length;
+	unsigned int todo;
+	u32 *src32;
+	u32 *dst32;
+
+	tmp = flag;
+	tmp |= SUNXI_SS_KEYSELECT_KEYN;
+	tmp |= SUNXI_SS_ENABLED;
+
+	in_sg = src;
+	out_sg = dst;
+	if (src == NULL || dst == NULL) {
+		dev_err(ss_ctx->dev, "ERROR: Some SGs are NULL\n");
+		return -1;
+	}
+	mutex_lock(&lock);
+	if (desc->info != NULL) {
+		for (i = 0; i < op->keylen; i += 4) {
+			v = *(u32 *)(op->key + i);
+			writel(v, ss_ctx->base + SUNXI_SS_KEY0 + i);
+		}
+		for (i = 0; i < 4; i++) {
+			v = *(u32 *)(desc->info + i * 4);
+			writel(v, ss_ctx->base + SUNXI_SS_IV0 + i * 4);
+		}
+	}
+	writel(tmp, ss_ctx->base + SUNXI_SS_CTL);
+
+	/* If we have only one SG, we can use kmap_atomic */
+	if (sg_next(in_sg) == NULL && sg_next(out_sg) == NULL) {
+		src_addr = kmap_atomic(sg_page(in_sg)) + in_sg->offset;
+		if (src_addr == NULL) {
+			dev_err(ss_ctx->dev, "kmap_atomic error for src SG\n");
+			writel(0, ss_ctx->base + SUNXI_SS_CTL);
+			mutex_unlock(&lock);
+			return -1;
+		}
+		dst_addr = kmap_atomic(sg_page(out_sg)) + out_sg->offset;
+		if (dst_addr == NULL) {
+			dev_err(ss_ctx->dev, "kmap_atomic error for dst SG\n");
+			writel(0, ss_ctx->base + SUNXI_SS_CTL);
+			mutex_unlock(&lock);
+			kunmap_atomic(src_addr);
+			return -1;
+		}
+		src32 = (u32 *)src_addr;
+		dst32 = (u32 *)dst_addr;
+		ileft = nbytes / 4;
+		oleft = nbytes / 4;
+		do {
+			if (ileft > 0 && rx_cnt > 0) {
+				todo = min(rx_cnt, ileft);
+				ileft -= todo;
+				do {
+					writel_relaxed(*src32++,
+						       ss_ctx->base +
+						       SS_RXFIFO);
+					todo--;
+				} while (todo > 0);
+			}
+			if (tx_cnt > 0) {
+				todo = min(tx_cnt, oleft);
+				oleft -= todo;
+				do {
+					*dst32++ = readl_relaxed(ss_ctx->base +
+								SS_TXFIFO);
+					todo--;
+				} while (todo > 0);
+			}
+			tmp = readl_relaxed(ss_ctx->base + SUNXI_SS_FCSR);
+			rx_cnt = SS_RXFIFO_SPACES(tmp);
+			tx_cnt = SS_TXFIFO_SPACES(tmp);
+		} while (oleft > 0);
+		writel(0, ss_ctx->base + SUNXI_SS_CTL);
+		mutex_unlock(&lock);
+		kunmap_atomic(src_addr);
+		kunmap_atomic(dst_addr);
+		return 0;
+	}
+
+	/* If we have more than one SG, we cannot use kmap_atomic since
+	 * we hold the mapping too long*/
+	src_addr = kmap(sg_page(in_sg)) + in_sg->offset;
+	if (src_addr == NULL) {
+		dev_err(ss_ctx->dev, "KMAP error for src SG\n");
+		return -1;
+	}
+	dst_addr = kmap(sg_page(out_sg)) + out_sg->offset;
+	if (dst_addr == NULL) {
+		kunmap(src_addr);
+		dev_err(ss_ctx->dev, "KMAP error for dst SG\n");
+		return -1;
+	}
+	src32 = (u32 *)src_addr;
+	dst32 = (u32 *)dst_addr;
+	ileft = nbytes / 4;
+	oleft = nbytes / 4;
+	sgileft = in_sg->length / 4;
+	sgoleft = out_sg->length / 4;
+	do {
+		tmp = readl_relaxed(ss_ctx->base + SUNXI_SS_FCSR);
+		rx_cnt = SS_RXFIFO_SPACES(tmp);
+		tx_cnt = SS_TXFIFO_SPACES(tmp);
+		todo = min3(rx_cnt, ileft, sgileft);
+		if (todo > 0) {
+			ileft -= todo;
+			sgileft -= todo;
+		}
+		while (todo > 0) {
+			writel_relaxed(*src32++, ss_ctx->base + SS_RXFIFO);
+			todo--;
+		}
+		if (in_sg != NULL && sgileft == 0) {
+			kunmap(sg_page(in_sg));
+			in_sg = sg_next(in_sg);
+			if (in_sg != NULL && ileft > 0) {
+				src_addr = kmap(sg_page(in_sg)) + in_sg->offset;
+				if (src_addr == NULL) {
+					dev_err(ss_ctx->dev, "KMAP error for src SG\n");
+					return -1;
+				}
+				src32 = src_addr;
+				sgileft = in_sg->length / 4;
+			}
+		}
+		/* do not test oleft since when oleft == 0 we have finished */
+		todo = min3(tx_cnt, oleft, sgoleft);
+		if (todo > 0) {
+			oleft -= todo;
+			sgoleft -= todo;
+		}
+		while (todo > 0) {
+			*dst32++ = readl_relaxed(ss_ctx->base + SS_TXFIFO);
+			todo--;
+		}
+		if (out_sg != NULL && sgoleft == 0) {
+			kunmap(sg_page(out_sg));
+			out_sg = sg_next(out_sg);
+			if (out_sg != NULL) {
+				dst_addr = kmap(sg_page(out_sg)) +
+					out_sg->offset;
+				if (dst_addr == NULL) {
+					dev_err(ss_ctx->dev, "KMAP error\n");
+					return -1;
+				}
+				dst32 = dst_addr;
+				sgoleft = out_sg->length / 4;
+			}
+		}
+	} while (oleft > 0);
+
+	writel(0, ss_ctx->base + SUNXI_SS_CTL);
+	mutex_unlock(&lock);
+	return 0;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static int sunxi_aes_cbc_encrypt(struct blkcipher_desc *desc,
+		struct scatterlist *dst, struct scatterlist *src,
+		unsigned int nbytes)
+{
+	struct sunxi_req_ctx *op = crypto_blkcipher_ctx(desc->tfm);
+	unsigned int ivsize = crypto_blkcipher_ivsize(desc->tfm);
+
+	if (unlikely(ivsize < 4)) {
+		dev_err(ss_ctx->dev, "Bad IV size %u\n", ivsize);
+		return -1;
+	}
+
+	if (desc->info == NULL) {
+		dev_err(ss_ctx->dev, "Empty IV\n");
+		return -1;
+	}
+
+	op->mode |= SUNXI_SS_ENCRYPTION;
+	op->mode |= SUNXI_OP_AES;
+	op->mode |= SUNXI_SS_CBC;
+
+	return sunxi_aes_poll(desc, dst, src, nbytes, op->mode);
+}
+/*============================================================================*/
+/*============================================================================*/
+static int sunxi_aes_cbc_decrypt(struct blkcipher_desc *desc,
+		struct scatterlist *dst, struct scatterlist *src,
+		unsigned int nbytes)
+{
+	struct sunxi_req_ctx *op = crypto_blkcipher_ctx(desc->tfm);
+	unsigned int ivsize = crypto_blkcipher_ivsize(desc->tfm);
+
+	if (unlikely(ivsize < 4)) {
+		dev_err(ss_ctx->dev, "Bad IV size %u\n", ivsize);
+		return -1;
+	}
+
+	if (desc->info == NULL) {
+		dev_err(ss_ctx->dev, "Empty IV\n");
+		return -1;
+	}
+
+	op->mode |= SUNXI_SS_DECRYPTION;
+	op->mode |= SUNXI_OP_AES;
+	op->mode |= SUNXI_SS_CBC;
+
+	return sunxi_aes_poll(desc, dst, src, nbytes, op->mode);
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static int sunxi_aes_init(struct crypto_tfm *tfm)
+{
+	struct sunxi_req_ctx *op = crypto_tfm_ctx(tfm);
+	memset(op, 0, sizeof(struct sunxi_req_ctx));
+	return 0;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static void sunxi_aes_exit(struct crypto_tfm *tfm)
+{
+}
+
+/*============================================================================*/
+/*============================================================================*/
+/* check and set the AES key, prepare the mode to be used */
+static int sunxi_aes_setkey(struct crypto_tfm *tfm, const u8 *key,
+		unsigned int keylen)
+{
+	struct sunxi_req_ctx *op = crypto_tfm_ctx(tfm);
+	switch (keylen) {
+	case 128 / 8:
+		op->mode = SUNXI_AES_128BITS;
+		break;
+	case 192 / 8:
+		op->mode = SUNXI_AES_192BITS;
+		break;
+	case 256 / 8:
+		op->mode = SUNXI_AES_256BITS;
+		break;
+	default:
+		dev_err(ss_ctx->dev, "Invalid keylen %u\n", keylen);
+		crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		return -EINVAL;
+	}
+	op->keylen = keylen;
+	memcpy(op->key, key, keylen);
+	return 0;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static struct crypto_alg sunxi_aes_alg = {
+	.cra_name = "cbc(aes)",
+	.cra_driver_name = "cbc-aes-sunxi-ss",
+	.cra_priority = 300,
+	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+	.cra_blocksize   = AES_BLOCK_SIZE,
+	.cra_ctxsize = sizeof(struct sunxi_req_ctx),
+	.cra_module = THIS_MODULE,
+	.cra_alignmask = 3,
+	.cra_type = &crypto_blkcipher_type,
+	.cra_init = sunxi_aes_init,
+	.cra_exit = sunxi_aes_exit,
+	.cra_u = {
+		.blkcipher = {
+			.min_keysize    = AES_MIN_KEY_SIZE,
+			.max_keysize    = AES_MAX_KEY_SIZE,
+			.ivsize         = AES_BLOCK_SIZE,
+			.setkey         = sunxi_aes_setkey,
+			.encrypt        = sunxi_aes_cbc_encrypt,
+			.decrypt        = sunxi_aes_cbc_decrypt,
+		}
+	}
+};
+
+#endif /* CONFIG_CRYPTO_DEV_SUNXI_SS_AES */
+
+#ifdef SUNXI_SS_DES
+/*============================================================================*/
+/*============================================================================*/
+/* common for DES/3DES */
+static int sunxi_des_init(struct crypto_tfm *tfm)
+{
+	struct sunxi_req_ctx *op = crypto_tfm_ctx(tfm);
+	memset(op, 0, sizeof(struct sunxi_req_ctx));
+	return 0;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+/* common for DES/3DES */
+static void sunxi_des_exit(struct crypto_tfm *tfm)
+{
+}
+/*============================================================================*/
+/*============================================================================*/
+/* Pure CPU way of doing DES/3DES with SS
+ * Since DES and 3DES SGs could be smaller than 4 bytes, I use sg_copy_to_buffer
+ * for "linearize" them.
+ * The only problem with that is that I alloc (2 x nbytes) for buf_in/buf_out
+ * TODO change this system
+ * SGsrc -> buf_in -> SS -> buf_out -> SGdst */
+static int sunxi_des_poll(struct blkcipher_desc *desc,
+		struct scatterlist *dst, struct scatterlist *src,
+		const unsigned int nbytes, const u32 flag)
+{
+	u32 tmp, value;
+	size_t nb_in_sg_tx, nb_in_sg_rx;
+	size_t ir, it;
+	struct sunxi_req_ctx *op = crypto_blkcipher_ctx(desc->tfm);
+	u32 tx_cnt = 0;
+	u32 rx_cnt = 0;
+	u32 v;
+	int i;
+	int no_chunk = 1;
+
+	/* if we have only SGs with size multiple of 4,
+	 * we can use the SS AES function */
+	struct scatterlist *in_sg;
+	struct scatterlist *out_sg;
+	in_sg = src;
+	out_sg = dst;
+
+	while (in_sg != NULL && no_chunk == 1) {
+		if ((in_sg->length % 4) != 0)
+			no_chunk = 0;
+		in_sg = sg_next(in_sg);
+	}
+	while (out_sg != NULL && no_chunk == 1) {
+		if ((out_sg->length % 4) != 0)
+			no_chunk = 0;
+		out_sg = sg_next(out_sg);
+	}
+
+	if (no_chunk == 1)
+		return sunxi_aes_poll(desc, dst, src, nbytes, flag);
+
+	tmp = flag;
+	tmp |= SUNXI_SS_KEYSELECT_KEYN;
+	tmp |= SUNXI_SS_ENABLED;
+
+	nb_in_sg_rx = sg_nents(src);
+	nb_in_sg_tx = sg_nents(dst);
+
+	mutex_lock(&bufin_lock);
+	if (ss_ctx->buf_in == NULL) {
+		ss_ctx->buf_in = kmalloc(nbytes, GFP_KERNEL);
+		ss_ctx->buf_in_size = nbytes;
+	} else {
+		if (nbytes > ss_ctx->buf_in_size) {
+			kfree(ss_ctx->buf_in);
+			ss_ctx->buf_in = kmalloc(nbytes, GFP_KERNEL);
+			ss_ctx->buf_in_size = nbytes;
+		}
+	}
+	if (ss_ctx->buf_in == NULL) {
+		ss_ctx->buf_in_size = 0;
+		mutex_unlock(&bufin_lock);
+		dev_err(ss_ctx->dev, "Unable to allocate pages.\n");
+		return -ENOMEM;
+	}
+	if (ss_ctx->buf_out == NULL) {
+		mutex_lock(&bufout_lock);
+		ss_ctx->buf_out = kmalloc(nbytes, GFP_KERNEL);
+		if (ss_ctx->buf_out == NULL) {
+			ss_ctx->buf_out_size = 0;
+			mutex_unlock(&bufout_lock);
+			dev_err(ss_ctx->dev, "Unable to allocate pages.\n");
+			return -ENOMEM;
+		}
+		ss_ctx->buf_out_size = nbytes;
+		mutex_unlock(&bufout_lock);
+	} else {
+		if (nbytes > ss_ctx->buf_out_size) {
+			mutex_lock(&bufout_lock);
+			kfree(ss_ctx->buf_out);
+			ss_ctx->buf_out = kmalloc(nbytes, GFP_KERNEL);
+			if (ss_ctx->buf_out == NULL) {
+				ss_ctx->buf_out_size = 0;
+				mutex_unlock(&bufout_lock);
+				dev_err(ss_ctx->dev, "Unable to allocate pages.\n");
+				return -ENOMEM;
+			}
+			ss_ctx->buf_out_size = nbytes;
+			mutex_unlock(&bufout_lock);
+		}
+	}
+
+	sg_copy_to_buffer(src, nb_in_sg_rx, ss_ctx->buf_in, nbytes);
+
+	ir = 0;
+	it = 0;
+	mutex_lock(&lock);
+	if (desc->info != NULL) {
+		for (i = 0; i < op->keylen; i += 4) {
+			v = *(u32 *)(op->key + i);
+			writel(v, ss_ctx->base + SUNXI_SS_KEY0 + i);
+		}
+		for (i = 0; i < 4; i++) {
+			v = *(u32 *)(desc->info + i * 4);
+			writel(v, ss_ctx->base + SUNXI_SS_IV0 + i * 4);
+		}
+	}
+	writel(tmp, ss_ctx->base + SUNXI_SS_CTL);
+
+	do {
+		if (rx_cnt == 0 || tx_cnt == 0) {
+			tmp = readl(ss_ctx->base + SUNXI_SS_FCSR);
+			rx_cnt = SS_RXFIFO_SPACES(tmp);
+			tx_cnt = SS_TXFIFO_SPACES(tmp);
+		}
+		if (rx_cnt > 0 && ir < nbytes) {
+			do {
+				value = *(u32 *)(ss_ctx->buf_in + ir);
+				writel(value, ss_ctx->base + SS_RXFIFO);
+				ir += 4;
+				rx_cnt--;
+			} while (rx_cnt > 0 && ir < nbytes);
+		}
+		if (tx_cnt > 0 && it < nbytes) {
+			do {
+				if (ir <= it)
+					dev_warn(ss_ctx->dev, "ANORMAL %u %u\n",
+							ir, it);
+				value = readl(ss_ctx->base + SS_TXFIFO);
+				*(u32 *)(ss_ctx->buf_out + it) = value;
+				it += 4;
+				tx_cnt--;
+			} while (tx_cnt > 0 && it < nbytes);
+		}
+		if (ir == nbytes) {
+			mutex_unlock(&bufin_lock);
+			ir++;
+		}
+	} while (it < nbytes);
+
+	writel(0, ss_ctx->base + SUNXI_SS_CTL);
+	mutex_unlock(&lock);
+
+	/* a simple optimization, since we dont need the hardware for this copy
+	 * we release the lock and do the copy. With that we gain 5/10% perf */
+	mutex_lock(&bufout_lock);
+	sg_copy_from_buffer(dst, nb_in_sg_tx, ss_ctx->buf_out, nbytes);
+
+	mutex_unlock(&bufout_lock);
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_DES
+/*============================================================================*/
+/*============================================================================*/
+/* check and set the DES key, prepare the mode to be used */
+static int sunxi_des_setkey(struct crypto_tfm *tfm, const u8 *key,
+		unsigned int keylen)
+{
+	struct sunxi_req_ctx *op = crypto_tfm_ctx(tfm);
+	if (keylen != DES_KEY_SIZE) {
+		dev_err(ss_ctx->dev, "Invalid keylen %u\n", keylen);
+		crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		return -EINVAL;
+	}
+	op->keylen = keylen;
+	memcpy(op->key, key, keylen);
+	return 0;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static int sunxi_des_cbc_encrypt(struct blkcipher_desc *desc,
+		struct scatterlist *dst, struct scatterlist *src,
+		unsigned int nbytes)
+{
+	struct sunxi_req_ctx *op = crypto_blkcipher_ctx(desc->tfm);
+	unsigned int ivsize = crypto_blkcipher_ivsize(desc->tfm);
+
+	if (ivsize < 4) {
+		dev_info(ss_ctx->dev, "Bad IV size %u\n", ivsize);
+		return -1;
+	}
+
+	if (desc->info == NULL) {
+		dev_info(ss_ctx->dev, "Empty IV\n");
+		return -1;
+	}
+
+	op->mode |= SUNXI_SS_ENCRYPTION;
+	op->mode |= SUNXI_OP_DES;
+	op->mode |= SUNXI_SS_CBC;
+
+	return sunxi_des_poll(desc, dst, src, nbytes, op->mode);
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static int sunxi_des_cbc_decrypt(struct blkcipher_desc *desc,
+		struct scatterlist *dst, struct scatterlist *src,
+		unsigned int nbytes)
+{
+	struct sunxi_req_ctx *op = crypto_blkcipher_ctx(desc->tfm);
+	unsigned int ivsize = crypto_blkcipher_ivsize(desc->tfm);
+
+	if (ivsize < 4) {
+		dev_info(ss_ctx->dev, "Bad IV size %u\n", ivsize);
+		return -1;
+	}
+
+	if (desc->info == NULL) {
+		dev_info(ss_ctx->dev, "Empty IV\n");
+		return -1;
+	}
+
+	op->mode |= SUNXI_SS_DECRYPTION;
+	op->mode |= SUNXI_OP_DES;
+	op->mode |= SUNXI_SS_CBC;
+
+	return sunxi_des_poll(desc, dst, src, nbytes, op->mode);
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static struct crypto_alg sunxi_des_alg = {
+	.cra_name = "cbc(des)",
+	.cra_driver_name = "cbc-des-sunxi-ss",
+	.cra_priority = 300,
+	.cra_blocksize = DES_BLOCK_SIZE,
+	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+	.cra_ctxsize = sizeof(struct sunxi_req_ctx),
+	.cra_module = THIS_MODULE,
+	.cra_type = &crypto_blkcipher_type,
+	.cra_init = sunxi_des_init,
+	.cra_exit = sunxi_des_exit,
+	.cra_alignmask = 3,
+	.cra_u.blkcipher = {
+		.min_keysize    = DES_KEY_SIZE,
+		.max_keysize    = DES_KEY_SIZE,
+		.ivsize         = 8,
+		.setkey         = sunxi_des_setkey,
+		.encrypt        = sunxi_des_cbc_encrypt,
+		.decrypt        = sunxi_des_cbc_decrypt,
+	}
+};
+
+#endif /* CONFIG_CRYPTO_DEV_SUNXI_SS_DES */
+
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_3DES
+/*============================================================================*/
+/*============================================================================*/
+/* check and set the 3DES key, prepare the mode to be used */
+static int sunxi_des3_setkey(struct crypto_tfm *tfm, const u8 *key,
+		unsigned int keylen)
+{
+	struct sunxi_req_ctx *op = crypto_tfm_ctx(tfm);
+	if (keylen != 3 * DES_KEY_SIZE) {
+		dev_err(ss_ctx->dev, "Invalid keylen %u\n", keylen);
+		crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		return -EINVAL;
+	}
+	op->keylen = keylen;
+	memcpy(op->key, key, keylen);
+	return 0;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static int sunxi_des3_cbc_encrypt(struct blkcipher_desc *desc,
+		struct scatterlist *dst, struct scatterlist *src,
+		unsigned int nbytes)
+{
+	struct sunxi_req_ctx *op = crypto_blkcipher_ctx(desc->tfm);
+	unsigned int ivsize = crypto_blkcipher_ivsize(desc->tfm);
+
+	if (ivsize < 4) {
+		dev_info(ss_ctx->dev, "Bad IV size %u\n", ivsize);
+		return -1;
+	}
+
+	if (desc->info == NULL) {
+		dev_info(ss_ctx->dev, "Empty IV\n");
+		return -1;
+	}
+
+	op->mode |= SUNXI_SS_ENCRYPTION;
+	op->mode |= SUNXI_OP_3DES;
+	op->mode |= SUNXI_SS_CBC;
+
+	return sunxi_des_poll(desc, dst, src, nbytes, op->mode);
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static int sunxi_des3_cbc_decrypt(struct blkcipher_desc *desc,
+		struct scatterlist *dst, struct scatterlist *src,
+		unsigned int nbytes)
+{
+	struct sunxi_req_ctx *op = crypto_blkcipher_ctx(desc->tfm);
+	unsigned int ivsize = crypto_blkcipher_ivsize(desc->tfm);
+
+	if (ivsize < 4) {
+		dev_info(ss_ctx->dev, "Bad IV size %u\n", ivsize);
+		return -1;
+	}
+
+	if (desc->info == NULL) {
+		dev_info(ss_ctx->dev, "Empty IV\n");
+		return -1;
+	}
+
+	op->mode |= SUNXI_SS_DECRYPTION;
+	op->mode |= SUNXI_OP_3DES;
+	op->mode |= SUNXI_SS_CBC;
+
+	return sunxi_des_poll(desc, dst, src, nbytes, op->mode);
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static struct crypto_alg sunxi_des3_alg = {
+	.cra_name = "cbc(des3_ede)",
+	.cra_driver_name = "cbc-des3-sunxi-ss",
+	.cra_priority = 300,
+	.cra_blocksize = DES3_EDE_BLOCK_SIZE,
+	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+	.cra_ctxsize = sizeof(struct sunxi_req_ctx),
+	.cra_module = THIS_MODULE,
+	.cra_type = &crypto_blkcipher_type,
+	.cra_init = sunxi_des_init,
+	.cra_exit = sunxi_des_exit,
+	.cra_alignmask = 3,
+	.cra_u.blkcipher = {
+		.min_keysize    = DES3_EDE_KEY_SIZE,
+		.max_keysize    = DES3_EDE_KEY_SIZE,
+		.ivsize         = 8,
+		.setkey         = sunxi_des3_setkey,
+		.encrypt        = sunxi_des3_cbc_encrypt,
+		.decrypt        = sunxi_des3_cbc_decrypt,
+	}
+};
+
+#endif /* CONFIG_CRYPTO_DEV_SUNXI_SS_3DES */
+
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_PRNG
+/*============================================================================*/
+/*============================================================================*/
+static int sunxi_ss_rng_get_random(struct crypto_rng *tfm, u8 *rdata,
+		unsigned int dlen)
+{
+	struct prng_context *ctx = crypto_tfm_ctx((struct crypto_tfm *)tfm);
+	unsigned int i;
+	u32 mode = 0;
+	u32 v;
+
+	dev_dbg(ss_ctx->dev, "DEBUG %s dlen=%u\n", __func__, dlen);
+
+	if (dlen == 0 || rdata == NULL)
+		return 0;
+
+	mode |= SUNXI_OP_PRNG;
+	mode |= SUNXI_PRNG_ONESHOT;
+	mode |= SUNXI_SS_ENABLED;
+
+	mutex_lock(&lock);
+	writel(mode, ss_ctx->base + SUNXI_SS_CTL);
+
+	for (i = 0; i < ctx->slen; i += 4) {
+		v = *(u32 *)(ctx->seed + i);
+		dev_dbg(ss_ctx->dev, "DEBUG Seed %d %x\n", i, v);
+	}
+
+	for (i = 0; i < ctx->slen && i < 192/8 && i < 16; i += 4) {
+		v = *(u32 *)(ctx->seed + i);
+		dev_dbg(ss_ctx->dev, "DEBUG Seed %d %x\n", i, v);
+		writel(v, ss_ctx->base + SUNXI_SS_KEY0 + i);
+	}
+
+	mode |= SUNXI_PRNG_START;
+	writel(mode, ss_ctx->base + SUNXI_SS_CTL);
+	for (i = 0; i < 4; i++) {
+		v = readl(ss_ctx->base + SUNXI_SS_CTL);
+		dev_dbg(ss_ctx->dev, "DEBUG CTL %x %x\n", mode, v);
+	}
+	for (i = 0; i < dlen && i < 160 / 8; i += 4) {
+		v = readl(ss_ctx->base + SUNXI_SS_MD0 + i);
+		*(u32 *)(rdata + i) = v;
+		dev_dbg(ss_ctx->dev, "DEBUG MD%d %x\n", i, v);
+	}
+
+	writel(0, ss_ctx->base + SUNXI_SS_CTL);
+	mutex_unlock(&lock);
+	return dlen;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static int sunxi_ss_rng_reset(struct crypto_rng *tfm, u8 *seed,
+		unsigned int slen)
+{
+	struct prng_context *ctx = crypto_tfm_ctx((struct crypto_tfm *)tfm);
+
+	dev_dbg(ss_ctx->dev, "DEBUG %s slen=%u\n", __func__, slen);
+	memcpy(ctx->seed, seed, slen);
+	ctx->slen = slen;
+	return 0;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static struct crypto_alg sunxi_ss_prng = {
+	.cra_name = "stdrng",
+	.cra_driver_name = "rng-sunxi-ss",
+	.cra_priority = 100,
+	.cra_flags = CRYPTO_ALG_TYPE_RNG,
+	.cra_ctxsize = sizeof(struct prng_context),
+	.cra_module = THIS_MODULE,
+	.cra_type = &crypto_rng_type,
+	.cra_u.rng = {
+		.rng_make_random = sunxi_ss_rng_get_random,
+		.rng_reset = sunxi_ss_rng_reset,
+		.seedsize = 192/8
+	}
+};
+#endif /* CRYPTO_DEV_SUNXI_SS_PRNG */
+
+/*============================================================================*/
+/*============================================================================*/
+static int sunxi_ss_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	u32 v;
+	int err;
+	unsigned long cr;
+
+	if (!pdev->dev.of_node)
+		return -ENODEV;
+
+	memset(ss_ctx, 0, sizeof(struct sunxi_ss_ctx));
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "Cannot get the MMIO ressource\n");
+		/* TODO PTR_ERR ? */
+		return -ENXIO;
+	}
+	ss_ctx->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(ss_ctx->base)) {
+		dev_err(&pdev->dev, "Cannot request MMIO\n");
+		return PTR_ERR(ss_ctx->base);
+	}
+
+	/* TODO Does this information could be usefull ? */
+	writel(SUNXI_SS_ENABLED, ss_ctx->base + SUNXI_SS_CTL);
+	v = readl(ss_ctx->base + SUNXI_SS_CTL);
+	v >>= 16;
+	v &= 0x07;
+	dev_info(&pdev->dev, "Die ID %d\n", v);
+	writel(0, ss_ctx->base + SUNXI_SS_CTL);
+
+	ss_ctx->ssclk = devm_clk_get(&pdev->dev, "mod");
+	if (IS_ERR(ss_ctx->ssclk)) {
+		err = PTR_ERR(ss_ctx->ssclk);
+		dev_err(&pdev->dev, "Cannot get SS clock err=%d\n", err);
+		return err;
+	}
+	dev_dbg(&pdev->dev, "clock ss acquired\n");
+
+	ss_ctx->busclk = devm_clk_get(&pdev->dev, "ahb");
+	if (IS_ERR(ss_ctx->busclk)) {
+		err = PTR_ERR(ss_ctx->busclk);
+		dev_err(&pdev->dev, "Cannot get AHB SS clock err=%d\n", err);
+		return err;
+	}
+	dev_dbg(&pdev->dev, "clock ahb_ss acquired\n");
+
+
+	/* Enable the clocks */
+	err = clk_prepare_enable(ss_ctx->busclk);
+	if (err != 0) {
+		dev_err(&pdev->dev, "Cannot prepare_enable busclk\n");
+		return err;
+	}
+	err = clk_prepare_enable(ss_ctx->ssclk);
+	if (err != 0) {
+		dev_err(&pdev->dev, "Cannot prepare_enable ssclk\n");
+		clk_disable_unprepare(ss_ctx->busclk);
+		return err;
+	}
+
+#define	SUNXI_SS_CLOCK_RATE_BUS (24 * 1000 * 1000)
+#define	SUNXI_SS_CLOCK_RATE_SS (150 * 1000 * 1000)
+
+	/* Check that clock have the correct rates gived in the datasheet */
+	cr = clk_get_rate(ss_ctx->busclk);
+	if (cr >= SUNXI_SS_CLOCK_RATE_BUS)
+		dev_dbg(&pdev->dev, "Clock bus %lu (%lu MHz) (must be >= %u)\n",
+				cr, cr / 1000000, SUNXI_SS_CLOCK_RATE_BUS);
+	else
+		dev_warn(&pdev->dev, "Clock bus %lu (%lu MHz) (must be >= %u)\n",
+				cr, cr / 1000000, SUNXI_SS_CLOCK_RATE_BUS);
+	cr = clk_get_rate(ss_ctx->ssclk);
+	if (cr == SUNXI_SS_CLOCK_RATE_SS)
+		dev_dbg(&pdev->dev, "Clock ss %lu (%lu MHz) (must be <= %u)\n",
+				cr, cr / 1000000, SUNXI_SS_CLOCK_RATE_SS);
+	else {
+		dev_warn(&pdev->dev, "Clock ss is at %lu (%lu MHz) (must be <= %u)\n",
+				cr, cr / 1000000, SUNXI_SS_CLOCK_RATE_SS);
+		/* Try to set the clock to the maximum allowed */
+		err = clk_set_rate(ss_ctx->ssclk, SUNXI_SS_CLOCK_RATE_SS);
+		if (err != 0) {
+			dev_err(&pdev->dev, "Cannot set clock rate to ssclk\n");
+			goto label_error_clock;
+		}
+		cr = clk_get_rate(ss_ctx->ssclk);
+		dev_info(&pdev->dev, "Clock ss set to %lu (%lu MHz) (must be >= %u)\n",
+				cr, cr / 1000000, SUNXI_SS_CLOCK_RATE_BUS);
+	}
+
+	ss_ctx->buf_in = NULL;
+	ss_ctx->buf_in_size = 0;
+	ss_ctx->buf_out = NULL;
+	ss_ctx->buf_out_size = 0;
+	ss_ctx->dev = &pdev->dev;
+
+	mutex_init(&lock);
+
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_PRNG
+	err = crypto_register_alg(&sunxi_ss_prng);
+	if (err) {
+		dev_err(&pdev->dev, "crypto_register_alg error\n");
+		goto label_error_prng;
+	} else {
+		dev_info(&pdev->dev, "Registred PRNG\n");
+	}
+#endif
+
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_MD5
+	err = crypto_register_shash(&sunxi_md5_alg);
+	if (err) {
+		dev_err(&pdev->dev, "Fail to register MD5\n");
+		goto label_error_md5;
+	} else {
+		dev_info(&pdev->dev, "Registred MD5\n");
+	}
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_SHA1
+	err = crypto_register_shash(&sunxi_sha1_alg);
+	if (err) {
+		dev_err(&pdev->dev, "Fail to register SHA1\n");
+		goto label_error_sha1;
+	} else {
+		dev_info(&pdev->dev, "Registred SHA1\n");
+	}
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_AES
+	err = crypto_register_alg(&sunxi_aes_alg);
+	if (err) {
+		dev_err(&pdev->dev, "crypto_register_alg error for AES\n");
+		goto label_error_aes;
+	} else {
+		dev_info(&pdev->dev, "Registred AES\n");
+	}
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_DES
+	err = crypto_register_alg(&sunxi_des_alg);
+	if (err) {
+		dev_err(&pdev->dev, "crypto_register_alg error for DES\n");
+		goto label_error_des;
+	} else {
+		dev_info(&pdev->dev, "Registred DES\n");
+	}
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_3DES
+	err = crypto_register_alg(&sunxi_des3_alg);
+	if (err) {
+		dev_err(&pdev->dev, "crypto_register_alg error for 3DES\n");
+		goto label_error_des3;
+	} else {
+		dev_info(&pdev->dev, "Registred 3DES\n");
+	}
+#endif
+	return 0;
+
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_3DES
+label_error_des3:
+	crypto_unregister_alg(&sunxi_des3_alg);
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_DES
+label_error_des:
+	crypto_unregister_alg(&sunxi_des_alg);
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_AES
+label_error_aes:
+	crypto_unregister_alg(&sunxi_aes_alg);
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_SHA1
+label_error_sha1:
+	crypto_unregister_shash(&sunxi_sha1_alg);
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_MD5
+label_error_md5:
+	crypto_unregister_shash(&sunxi_md5_alg);
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_PRNG
+label_error_prng:
+	crypto_unregister_alg(&sunxi_ss_prng);
+#endif
+label_error_clock:
+	if (ss_ctx->ssclk != NULL)
+		clk_disable_unprepare(ss_ctx->ssclk);
+	if (ss_ctx->busclk != NULL)
+		clk_disable_unprepare(ss_ctx->busclk);
+
+	return err;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static int __exit sunxi_ss_remove(struct platform_device *pdev)
+{
+	if (!pdev->dev.of_node)
+		return 0;
+
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_MD5
+	crypto_unregister_shash(&sunxi_md5_alg);
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_SHA1
+	crypto_unregister_shash(&sunxi_sha1_alg);
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_PRNG
+	crypto_unregister_alg(&sunxi_ss_prng);
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_AES
+	crypto_unregister_alg(&sunxi_aes_alg);
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_3DES
+	crypto_unregister_alg(&sunxi_des3_alg);
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_DES
+	crypto_unregister_alg(&sunxi_des_alg);
+#endif
+	/* TODO devm_kmalloc / devm_kfree */
+	if (ss_ctx->buf_in != NULL)
+		kfree(ss_ctx->buf_in);
+	if (ss_ctx->buf_out != NULL)
+		kfree(ss_ctx->buf_out);
+
+	writel(0, ss_ctx->base + SUNXI_SS_CTL);
+	clk_disable_unprepare(ss_ctx->busclk);
+	clk_disable_unprepare(ss_ctx->ssclk);
+	return 0;
+}
+
+/*============================================================================*/
+/*============================================================================*/
+static const struct of_device_id a20ss_crypto_of_match_table[] = {
+	{ .compatible = "allwinner,sun7i-a20-crypto" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, a20ss_crypto_of_match_table);
+
+static struct platform_driver sunxi_ss_driver = {
+	.probe          = sunxi_ss_probe,
+	.remove         = sunxi_ss_remove,
+	.driver         = {
+		.owner          = THIS_MODULE,
+		.name           = "sunxi-ss",
+		.of_match_table	= a20ss_crypto_of_match_table,
+	},
+};
+
+module_platform_driver(sunxi_ss_driver);
+
+MODULE_DESCRIPTION("Allwinner Security System crypto accelerator");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Corentin LABBE <clabbe.montjoie@...il.com>");
-- 
1.8.5.5

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