Re: [PATCH 2/5] crypto: add Atmel AES driver

Jean-Christophe PLAGNIOL-VILLARD
2012-07-06T12:16:53Z

On 19:19 Sun 01 Jul , Eric Bénard wrote:
> From: Nicolas Royer <nicolas@eukrea.com>
>
> Signed-off-by: Nicolas Royer <nicolas@eukrea.com>
> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
> Acked-by: Eric Bénard <eric@eukrea.com>
> Tested-by: Eric Bénard <eric@eukrea.com>
> ---
> drivers/crypto/Kconfig | 17 +
> drivers/crypto/Makefile | 3 +-
> drivers/crypto/atmel-aes-regs.h | 62 ++
> drivers/crypto/atmel-aes.c | 1206 +++++++++++++++++++++++++++++++++++++++
> 4 files changed, 1287 insertions(+), 1 deletions(-)
> create mode 100644 drivers/crypto/atmel-aes-regs.h
> create mode 100644 drivers/crypto/atmel-aes.c
>
> diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
> index 1092a77..1be94e5 100644
> --- a/drivers/crypto/Kconfig
> +++ b/drivers/crypto/Kconfig
> @@ -325,4 +325,21 @@ if CRYPTO_DEV_UX500
> source "drivers/crypto/ux500/Kconfig"
> endif # if CRYPTO_DEV_UX500
>
> +config CRYPTO_DEV_ATMEL_AES
> + tristate "Support for Atmel AES hw accelerator"
> + depends on ARCH_AT91
> + select CRYPTO_CBC
> + select CRYPTO_ECB
> + select CRYPTO_AES
> + select CRYPTO_ALGAPI
> + select CRYPTO_BLKCIPHER
> + select CONFIG_AT_HDMAC
> + help
> + Some Atmel processors have AES hw accelerator.
> + Select this if you want to use the Atmel module for
> + AES algorithms.
> +
> + To compile this driver as a module, choose M here: the module
> + will be called atmel-aes.
> +
> endif # CRYPTO_HW
> diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
> index 0139032..7d17b67 100644
> --- a/drivers/crypto/Makefile
> +++ b/drivers/crypto/Makefile
> @@ -14,4 +14,5 @@ obj-$(CONFIG_CRYPTO_DEV_OMAP_AES) += omap-aes.o
> obj-$(CONFIG_CRYPTO_DEV_PICOXCELL) += picoxcell_crypto.o
> obj-$(CONFIG_CRYPTO_DEV_S5P) += s5p-sss.o
> obj-$(CONFIG_CRYPTO_DEV_TEGRA_AES) += tegra-aes.o
> -obj-$(CONFIG_CRYPTO_DEV_UX500) += ux500/
> \ No newline at end of file
> +obj-$(CONFIG_CRYPTO_DEV_UX500) += ux500/
> +obj-$(CONFIG_CRYPTO_DEV_ATMEL_AES) += atmel-aes.o
> diff --git a/drivers/crypto/atmel-aes-regs.h b/drivers/crypto/atmel-aes-regs.h
> new file mode 100644
> index 0000000..2786bb1
> --- /dev/null
> +++ b/drivers/crypto/atmel-aes-regs.h
> @@ -0,0 +1,62 @@
> +#ifndef __ATMEL_AES_REGS_H__
> +#define __ATMEL_AES_REGS_H__
> +
> +#define AES_CR 0x00
> +#define AES_CR_START (1 << 0)
> +#define AES_CR_SWRST (1 << 8)
> +#define AES_CR_LOADSEED (1 << 16)
> +
> +#define AES_MR 0x04
> +#define AES_MR_CYPHER_DEC (0 << 0)
> +#define AES_MR_CYPHER_ENC (1 << 0)
> +#define AES_MR_DUALBUFF (1 << 3)
> +#define AES_MR_PROCDLY_MASK (0xF << 4)
> +#define AES_MR_PROCDLY_OFFSET 4
> +#define AES_MR_SMOD_MASK (0x3 << 8)
> +#define AES_MR_SMOD_MANUAL (0x0 << 8)
> +#define AES_MR_SMOD_AUTO (0x1 << 8)
> +#define AES_MR_SMOD_IDATAR0 (0x2 << 8)
> +#define AES_MR_KEYSIZE_MASK (0x3 << 10)
> +#define AES_MR_KEYSIZE_128 (0x0 << 10)
> +#define AES_MR_KEYSIZE_192 (0x1 << 10)
> +#define AES_MR_KEYSIZE_256 (0x2 << 10)
> +#define AES_MR_OPMOD_MASK (0x7 << 12)
> +#define AES_MR_OPMOD_ECB (0x0 << 12)
> +#define AES_MR_OPMOD_CBC (0x1 << 12)
> +#define AES_MR_OPMOD_OFB (0x2 << 12)
> +#define AES_MR_OPMOD_CFB (0x3 << 12)
> +#define AES_MR_OPMOD_CTR (0x4 << 12)
> +#define AES_MR_LOD (0x1 << 15)
> +#define AES_MR_CFBS_MASK (0x7 << 16)
> +#define AES_MR_CFBS_128b (0x0 << 16)
> +#define AES_MR_CFBS_64b (0x1 << 16)
> +#define AES_MR_CFBS_32b (0x2 << 16)
> +#define AES_MR_CFBS_16b (0x3 << 16)
> +#define AES_MR_CFBS_8b (0x4 << 16)
> +#define AES_MR_CKEY_MASK (0xF << 20)
> +#define AES_MR_CKEY_OFFSET 20
> +#define AES_MR_CMTYP_MASK (0x1F << 24)
> +#define AES_MR_CMTYP_OFFSET 24
> +
> +#define AES_IER 0x10
> +#define AES_IDR 0x14
> +#define AES_IMR 0x18
> +#define AES_ISR 0x1C
> +#define AES_INT_DATARDY (1 << 0)
> +#define AES_INT_URAD (1 << 8)
> +#define AES_ISR_URAT_MASK (0xF << 12)
> +#define AES_ISR_URAT_IDR_WR_PROC (0x0 << 12)
> +#define AES_ISR_URAT_ODR_RD_PROC (0x1 << 12)
> +#define AES_ISR_URAT_MR_WR_PROC (0x2 << 12)
> +#define AES_ISR_URAT_ODR_RD_SUBK (0x3 << 12)
> +#define AES_ISR_URAT_MR_WR_SUBK (0x4 << 12)
> +#define AES_ISR_URAT_WOR_RD (0x5 << 12)
> +
> +#define AES_KEYWR(x) (0x20 + ((x) * 0x04))
> +#define AES_IDATAR(x) (0x40 + ((x) * 0x04))
> +#define AES_ODATAR(x) (0x50 + ((x) * 0x04))
> +#define AES_IVR(x) (0x60 + ((x) * 0x04))
> +
> +#define AES_HW_VERSION 0xFC
> +
> +#endif /* __ATMEL_AES_REGS_H__ */
> diff --git a/drivers/crypto/atmel-aes.c b/drivers/crypto/atmel-aes.c
> new file mode 100644
> index 0000000..6bb20ff
> --- /dev/null
> +++ b/drivers/crypto/atmel-aes.c
> @@ -0,0 +1,1206 @@
> +/*
> + * Cryptographic API.
> + *
> + * Support for ATMEL AES HW acceleration.
> + *
> + * Copyright (c) 2012 Eukréa Electromatique - ATMEL
> + * Author: Nicolas Royer <nicolas@eukrea.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as published
> + * by the Free Software Foundation.
> + *
> + * Some ideas are from omap-aes.c driver.
> + */
> +
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/err.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/hw_random.h>
> +#include <linux/platform_device.h>
> +
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/errno.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/clk.h>
> +#include <linux/irq.h>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +#include <linux/scatterlist.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/delay.h>
> +#include <linux/crypto.h>
> +#include <linux/cryptohash.h>
> +#include <crypto/scatterwalk.h>
> +#include <crypto/algapi.h>
> +#include <crypto/aes.h>
> +#include <crypto/hash.h>
> +#include <crypto/internal/hash.h>
> +#include <linux/platform_data/atmel-aes.h>
> +#include "atmel-aes-regs.h"
> +
> +#define CFB8_BLOCK_SIZE 1
> +#define CFB16_BLOCK_SIZE 2
> +#define CFB32_BLOCK_SIZE 4
> +#define CFB64_BLOCK_SIZE 8
> +
> +/* AES flags */
> +#define AES_FLAGS_MODE_MASK 0x01ff
> +#define AES_FLAGS_ENCRYPT BIT(0)
> +#define AES_FLAGS_CBC BIT(1)
> +#define AES_FLAGS_CFB BIT(2)
> +#define AES_FLAGS_CFB8 BIT(3)
> +#define AES_FLAGS_CFB16 BIT(4)
> +#define AES_FLAGS_CFB32 BIT(5)
> +#define AES_FLAGS_CFB64 BIT(6)
> +#define AES_FLAGS_OFB BIT(7)
> +#define AES_FLAGS_CTR BIT(8)
> +
> +#define AES_FLAGS_INIT BIT(16)
> +#define AES_FLAGS_DMA BIT(17)
> +#define AES_FLAGS_BUSY BIT(18)
> +
> +#define AES_FLAGS_DUALBUFF BIT(24)
> +
> +#define ATMEL_AES_QUEUE_LENGTH 1
> +#define ATMEL_AES_CACHE_SIZE 0
> +
> +#define ATMEL_AES_DMA_THRESHOLD 16
> +
> +
> +struct atmel_aes_dev;
> +
> +struct atmel_aes_ctx {
> + struct atmel_aes_dev *dd;
> +
> + int keylen;
> + u32 key[AES_KEYSIZE_256 / sizeof(u32)];
> +};
> +
> +struct atmel_aes_reqctx {
> + unsigned long mode;
> +};
> +
> +struct atmel_aes_dma {
> + struct dma_chan *chan;
> + struct dma_slave_config dma_conf;
> +};
> +
> +struct atmel_aes_dev {
> + struct list_head list;
> + unsigned long phys_base;
> + void __iomem *io_base;
> +
> + struct atmel_aes_ctx *ctx;
> + struct device *dev;
> + struct clk *iclk;
> + int irq;
> +
> + unsigned long flags;
> + int err;
> +
> + spinlock_t lock;
> + struct crypto_queue queue;
> +
> + struct tasklet_struct done_task;
> + struct tasklet_struct queue_task;
> +
> + struct ablkcipher_request *req;
> + size_t total;
> +
> + struct scatterlist *in_sg;
> + unsigned int nb_in_sg;
> +
> + struct scatterlist *out_sg;
> + unsigned int nb_out_sg;
> +
> + size_t bufcnt;
> +
> + u8 buf_in[ATMEL_AES_DMA_THRESHOLD] __aligned(sizeof(u32));
can you allocate it
> + int dma_in;
> + struct atmel_aes_dma dma_lch_in;
> +
> + u8 buf_out[ATMEL_AES_DMA_THRESHOLD] __aligned(sizeof(u32));
ditto

otherwise looks good

Best Regards,
J.
> + int dma_out;
> + struct atmel_aes_dma dma_lch_out;
> +
> + u32 hw_version;
> +};
> +
> +struct atmel_aes_drv {
> + struct list_head dev_list;
> + spinlock_t lock;
> +};
> +
> +static struct atmel_aes_drv atmel_aes = {
> + .dev_list = LIST_HEAD_INIT(atmel_aes.dev_list),
> + .lock = __SPIN_LOCK_UNLOCKED(atmel_aes.lock),
> +};
> +
> +static int atmel_aes_sg_length(struct ablkcipher_request *req,
> + struct scatterlist *sg)
> +{
> + unsigned int total = req->nbytes;
> + int sg_nb;
> + unsigned int len;
> + struct scatterlist *sg_list;
> +
> + sg_nb = 0;
> + sg_list = sg;
> + total = req->nbytes;
> +
> + while (total) {
> + len = min(sg_list->length, total);
> +
> + sg_nb++;
> + total -= len;
> +
> + sg_list = sg_next(sg_list);
> + if (!sg_list)
> + total = 0;
> + }
> +
> + return sg_nb;
> +}
> +
> +static inline u32 atmel_aes_read(struct atmel_aes_dev *dd, u32 offset)
> +{
> + return readl_relaxed(dd->io_base + offset);
> +}
> +
> +static inline void atmel_aes_write(struct atmel_aes_dev *dd,
> + u32 offset, u32 value)
> +{
> + writel_relaxed(value, dd->io_base + offset);
> +}
> +
> +static void atmel_aes_read_n(struct atmel_aes_dev *dd, u32 offset,
> + u32 *value, int count)
> +{
> + for (; count--; value++, offset += 4)
> + *value = atmel_aes_read(dd, offset);
> +}
> +
> +static void atmel_aes_write_n(struct atmel_aes_dev *dd, u32 offset,
> + u32 *value, int count)
> +{
> + for (; count--; value++, offset += 4)
> + atmel_aes_write(dd, offset, *value);
> +}
> +
> +static void atmel_aes_dualbuff_test(struct atmel_aes_dev *dd)
> +{
> + atmel_aes_write(dd, AES_MR, AES_MR_DUALBUFF);
> +
> + if (atmel_aes_read(dd, AES_MR) & AES_MR_DUALBUFF)
> + dd->flags |= AES_FLAGS_DUALBUFF;
> +}
> +
> +static struct atmel_aes_dev *atmel_aes_find_dev(struct atmel_aes_ctx *ctx)
> +{
> + struct atmel_aes_dev *aes_dd = NULL;
> + struct atmel_aes_dev *tmp;
> +
> + spin_lock_bh(&atmel_aes.lock);
> + if (!ctx->dd) {
> + list_for_each_entry(tmp, &atmel_aes.dev_list, list) {
> + aes_dd = tmp;
> + break;
> + }
> + ctx->dd = aes_dd;
> + } else {
> + aes_dd = ctx->dd;
> + }
> +
> + spin_unlock_bh(&atmel_aes.lock);
> +
> + return aes_dd;
> +}
> +
> +static int atmel_aes_hw_init(struct atmel_aes_dev *dd)
> +{
> + clk_prepare_enable(dd->iclk);
> +
> + if (!(dd->flags & AES_FLAGS_INIT)) {
return directly
> + atmel_aes_write(dd, AES_CR, AES_CR_SWRST);
> + atmel_aes_dualbuff_test(dd);
> + dd->flags |= AES_FLAGS_INIT;
> + dd->err = 0;
> + }
> +
> + return 0;
> +}
> +
> +static void atmel_aes_hw_version_init(struct atmel_aes_dev *dd)
> +{
> + atmel_aes_hw_init(dd);
> +
> + dd->hw_version = atmel_aes_read(dd, AES_HW_VERSION);
> +
> + clk_disable_unprepare(dd->iclk);
> +}
> +
> +static void atmel_aes_finish_req(struct atmel_aes_dev *dd, int err)
> +{
> + struct ablkcipher_request *req = dd->req;
> +
> + clk_disable_unprepare(dd->iclk);
> + dd->flags &= ~AES_FLAGS_BUSY;
> +
> + req->base.complete(&req->base, err);
> +}
> +
> +static void atmel_aes_dma_callback(void *data)
> +{
> + struct atmel_aes_dev *dd = data;
> +
> + /* dma_lch_out - completed */
> + tasklet_schedule(&dd->done_task);
> +}
> +
> +static int atmel_aes_crypt_dma(struct atmel_aes_dev *dd)
> +{
> + struct dma_async_tx_descriptor *in_desc, *out_desc;
> + int nb_dma_sg_in, nb_dma_sg_out;
> +
> + dd->nb_in_sg = atmel_aes_sg_length(dd->req, dd->in_sg);
> + if (!dd->nb_in_sg)
> + goto exit_err;
> +
> + nb_dma_sg_in = dma_map_sg(dd->dev, dd->in_sg, dd->nb_in_sg,
> + DMA_TO_DEVICE);
> + if (!nb_dma_sg_in)
> + goto exit_err;
> +
> + in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, dd->in_sg,
> + nb_dma_sg_in, DMA_MEM_TO_DEV,
> + DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
> +
> + if (!in_desc)
> + goto unmap_in;
> +
> + /* callback not needed */
> +
> + dd->nb_out_sg = atmel_aes_sg_length(dd->req, dd->out_sg);
> + if (!dd->nb_out_sg)
> + goto unmap_in;
> +
> + nb_dma_sg_out = dma_map_sg(dd->dev, dd->out_sg, dd->nb_out_sg,
> + DMA_FROM_DEVICE);
> + if (!nb_dma_sg_out)
> + goto unmap_out;
> +
> + out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, dd->out_sg,
> + nb_dma_sg_out, DMA_DEV_TO_MEM,
> + DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
> +
> + if (!out_desc)
> + goto unmap_out;
> +
> + out_desc->callback = atmel_aes_dma_callback;
> + out_desc->callback_param = dd;
> +
> + dd->total -= dd->req->nbytes;
> +
> + dmaengine_submit(out_desc);
> + dma_async_issue_pending(dd->dma_lch_out.chan);
> +
> + dmaengine_submit(in_desc);
> + dma_async_issue_pending(dd->dma_lch_in.chan);
> +
> + return 0;
> +
> +unmap_out:
> + dma_unmap_sg(dd->dev, dd->out_sg, dd->nb_out_sg,
> + DMA_FROM_DEVICE);
> +unmap_in:
> + dma_unmap_sg(dd->dev, dd->in_sg, dd->nb_in_sg,
> + DMA_TO_DEVICE);
> +exit_err:
> + return -EINVAL;
> +}
> +
> +static int atmel_aes_crypt_cpu_start(struct atmel_aes_dev *dd)
> +{
> + dd->flags &= ~AES_FLAGS_DMA;
> +
> + /* use cache buffers */
> + dd->nb_in_sg = atmel_aes_sg_length(dd->req, dd->in_sg);
> + if (!dd->nb_in_sg)
> + return -EINVAL;
> +
> + dd->nb_out_sg = atmel_aes_sg_length(dd->req, dd->out_sg);
> + if (!dd->nb_in_sg)
> + return -EINVAL;
> +
> + dd->bufcnt = sg_copy_to_buffer(dd->in_sg, dd->nb_in_sg,
> + dd->buf_in, dd->total);
> +
> + if (!dd->bufcnt)
> + return -EINVAL;
> +
> + dd->total -= dd->bufcnt;
> +
> + atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
> + atmel_aes_write_n(dd, AES_IDATAR(0), (u32 *) dd->buf_in,
> + dd->bufcnt >> 2);
> +
> + return 0;
> +}
> +
> +static int atmel_aes_crypt_dma_start(struct atmel_aes_dev *dd)
> +{
> + int err;
> +
> + if (dd->flags & AES_FLAGS_CFB8) {
> + dd->dma_lch_in.dma_conf.dst_addr_width =
> + DMA_SLAVE_BUSWIDTH_1_BYTE;
> + dd->dma_lch_out.dma_conf.src_addr_width =
> + DMA_SLAVE_BUSWIDTH_1_BYTE;
> + } else if (dd->flags & AES_FLAGS_CFB16) {
> + dd->dma_lch_in.dma_conf.dst_addr_width =
> + DMA_SLAVE_BUSWIDTH_2_BYTES;
> + dd->dma_lch_out.dma_conf.src_addr_width =
> + DMA_SLAVE_BUSWIDTH_2_BYTES;
> + } else {
> + dd->dma_lch_in.dma_conf.dst_addr_width =
> + DMA_SLAVE_BUSWIDTH_4_BYTES;
> + dd->dma_lch_out.dma_conf.src_addr_width =
> + DMA_SLAVE_BUSWIDTH_4_BYTES;
> + }
> +
> + dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
> + dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf);
> +
> + dd->flags |= AES_FLAGS_DMA;
> + err = atmel_aes_crypt_dma(dd);
> +
> + return err;
> +}
> +
> +static int atmel_aes_write_ctrl(struct atmel_aes_dev *dd)
> +{
> + int err;
> + u32 valcr = 0, valmr = 0;
> +
> + err = atmel_aes_hw_init(dd);
> +
> + if (err)
> + return err;
> +
> + /* MR register must be set before IV registers */
> + if (dd->ctx->keylen == AES_KEYSIZE_128)
> + valmr |= AES_MR_KEYSIZE_128;
> + else if (dd->ctx->keylen == AES_KEYSIZE_192)
> + valmr |= AES_MR_KEYSIZE_192;
> + else
> + valmr |= AES_MR_KEYSIZE_256;
> +
> + if (dd->flags & AES_FLAGS_CBC) {
> + valmr |= AES_MR_OPMOD_CBC;
> + } else if (dd->flags & AES_FLAGS_CFB) {
> + valmr |= AES_MR_OPMOD_CFB;
> + if (dd->flags & AES_FLAGS_CFB8)
> + valmr |= AES_MR_CFBS_8b;
> + else if (dd->flags & AES_FLAGS_CFB16)
> + valmr |= AES_MR_CFBS_16b;
> + else if (dd->flags & AES_FLAGS_CFB32)
> + valmr |= AES_MR_CFBS_32b;
> + else if (dd->flags & AES_FLAGS_CFB64)
> + valmr |= AES_MR_CFBS_64b;
> + } else if (dd->flags & AES_FLAGS_OFB) {
> + valmr |= AES_MR_OPMOD_OFB;
> + } else if (dd->flags & AES_FLAGS_CTR) {
> + valmr |= AES_MR_OPMOD_CTR;
> + } else {
> + valmr |= AES_MR_OPMOD_ECB;
> + }
> +
> + if (dd->flags & AES_FLAGS_ENCRYPT)
> + valmr |= AES_MR_CYPHER_ENC;
> +
> + if (dd->total > ATMEL_AES_DMA_THRESHOLD) {
> + valmr |= AES_MR_SMOD_IDATAR0;
> + if (dd->flags & AES_FLAGS_DUALBUFF)
> + valmr |= AES_MR_DUALBUFF;
> + } else {
> + valmr |= AES_MR_SMOD_AUTO;
> + }
> +
> + atmel_aes_write(dd, AES_CR, valcr);
> + atmel_aes_write(dd, AES_MR, valmr);
> +
> + atmel_aes_write_n(dd, AES_KEYWR(0), dd->ctx->key,
> + dd->ctx->keylen >> 2);
> +
> + if (((dd->flags & AES_FLAGS_CBC) || (dd->flags & AES_FLAGS_CFB) ||
> + (dd->flags & AES_FLAGS_OFB) || (dd->flags & AES_FLAGS_CTR)) &&
> + dd->req->info) {
> + atmel_aes_write_n(dd, AES_IVR(0), dd->req->info, 4);
> + }
> +
> + return 0;
> +}
> +
> +static int atmel_aes_handle_queue(struct atmel_aes_dev *dd,
> + struct ablkcipher_request *req)
> +{
> + struct crypto_async_request *async_req, *backlog;
> + struct atmel_aes_ctx *ctx;
> + struct atmel_aes_reqctx *rctx;
> + unsigned long flags;
> + int err, ret = 0;
> +
> + spin_lock_irqsave(&dd->lock, flags);
> + if (req)
> + ret = ablkcipher_enqueue_request(&dd->queue, req);
> + if (dd->flags & AES_FLAGS_BUSY) {
> + spin_unlock_irqrestore(&dd->lock, flags);
> + return ret;
> + }
> + backlog = crypto_get_backlog(&dd->queue);
> + async_req = crypto_dequeue_request(&dd->queue);
> + if (async_req)
> + dd->flags |= AES_FLAGS_BUSY;
> + spin_unlock_irqrestore(&dd->lock, flags);
> +
> + if (!async_req)
> + return ret;
> +
> + if (backlog)
> + backlog->complete(backlog, -EINPROGRESS);
> +
> + req = ablkcipher_request_cast(async_req);
> +
> + /* assign new request to device */
> + dd->req = req;
> + dd->total = req->nbytes;
> + dd->in_sg = req->src;
> + dd->out_sg = req->dst;
> +
> + rctx = ablkcipher_request_ctx(req);
> + ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
> + rctx->mode &= AES_FLAGS_MODE_MASK;
> + dd->flags = (dd->flags & ~AES_FLAGS_MODE_MASK) | rctx->mode;
> + dd->ctx = ctx;
> + ctx->dd = dd;
> +
> + err = atmel_aes_write_ctrl(dd);
> + if (!err) {
> + if (dd->total > ATMEL_AES_DMA_THRESHOLD)
> + err = atmel_aes_crypt_dma_start(dd);
> + else
> + err = atmel_aes_crypt_cpu_start(dd);
> + }
> + if (err) {
> + /* aes_task will not finish it, so do it here */
> + atmel_aes_finish_req(dd, err);
> + tasklet_schedule(&dd->queue_task);
> + }
> +
> + return ret;
> +}
> +
> +static int atmel_aes_crypt_dma_stop(struct atmel_aes_dev *dd)
> +{
> + int err = -EINVAL;
> +
> + if (dd->flags & AES_FLAGS_DMA) {
> + dma_unmap_sg(dd->dev, dd->out_sg,
> + dd->nb_out_sg, DMA_FROM_DEVICE);
> + dma_unmap_sg(dd->dev, dd->in_sg,
> + dd->nb_in_sg, DMA_TO_DEVICE);
> + err = 0;
> + }
> +
> + return err;
> +}
> +
> +static int atmel_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
> +{
> + struct atmel_aes_ctx *ctx = crypto_ablkcipher_ctx(
> + crypto_ablkcipher_reqtfm(req));
> + struct atmel_aes_reqctx *rctx = ablkcipher_request_ctx(req);
> + struct atmel_aes_dev *dd;
> +
> + if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
> + pr_err("request size is not exact amount of AES blocks\n");
> + return -EINVAL;
> + }
> +
> + dd = atmel_aes_find_dev(ctx);
> + if (!dd)
> + return -ENODEV;
> +
> + rctx->mode = mode;
> +
> + return atmel_aes_handle_queue(dd, req);
> +}
> +
> +static bool atmel_aes_filter(struct dma_chan *chan, void *slave)
> +{
> + struct at_dma_slave *sl = slave;
> +
> + if (sl && sl->dma_dev == chan->device->dev) {
> + chan->private = sl;
> + return true;
> + } else {
> + return false;
> + }
> +}
> +
> +static int atmel_aes_dma_init(struct atmel_aes_dev *dd)
> +{
> + int err = -ENOMEM;
> + struct aes_platform_data *pdata;
> + dma_cap_mask_t mask_in, mask_out;
> +
> + pdata = dd->dev->platform_data;
> +
> + if (pdata && pdata->dma_slave->txdata.dma_dev &&
> + pdata->dma_slave->rxdata.dma_dev) {
> +
> + /* Try to grab 2 DMA channels */
> + dma_cap_zero(mask_in);
> + dma_cap_set(DMA_SLAVE, mask_in);
> +
> + dd->dma_lch_in.chan = dma_request_channel(mask_in,
> + atmel_aes_filter, &pdata->dma_slave->rxdata);
> + if (!dd->dma_lch_in.chan)
> + goto err_dma_in;
> +
> + dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV;
> + dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
> + AES_IDATAR(0);
> + dd->dma_lch_in.dma_conf.src_maxburst = 1;
> + dd->dma_lch_in.dma_conf.dst_maxburst = 1;
> + dd->dma_lch_in.dma_conf.device_fc = false;
> +
> + dma_cap_zero(mask_out);
> + dma_cap_set(DMA_SLAVE, mask_out);
> + dd->dma_lch_out.chan = dma_request_channel(mask_out,
> + atmel_aes_filter, &pdata->dma_slave->txdata);
> + if (!dd->dma_lch_out.chan)
> + goto err_dma_out;
> +
> + dd->dma_lch_out.dma_conf.direction = DMA_DEV_TO_MEM;
> + dd->dma_lch_out.dma_conf.src_addr = dd->phys_base +
> + AES_ODATAR(0);
> + dd->dma_lch_out.dma_conf.src_maxburst = 1;
> + dd->dma_lch_out.dma_conf.dst_maxburst = 1;
> + dd->dma_lch_out.dma_conf.device_fc = false;
> +
> + return 0;
> + } else {
> + return -ENODEV;
> + }
> +
> +err_dma_out:
> + dma_release_channel(dd->dma_lch_in.chan);
> +err_dma_in:
> + return err;
> +}
> +
> +static void atmel_aes_dma_cleanup(struct atmel_aes_dev *dd)
> +{
> + dma_release_channel(dd->dma_lch_in.chan);
> + dma_release_channel(dd->dma_lch_out.chan);
> +}
> +
> +static int atmel_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
> + unsigned int keylen)
> +{
> + struct atmel_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
> +
> + if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
> + keylen != AES_KEYSIZE_256) {
> + crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
> + return -EINVAL;
> + }
> +
> + memcpy(ctx->key, key, keylen);
> + ctx->keylen = keylen;
> +
> + return 0;
> +}
> +
> +static int atmel_aes_ecb_encrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_ENCRYPT);
> +}
> +
> +static int atmel_aes_ecb_decrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + 0);
> +}
> +
> +static int atmel_aes_cbc_encrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_ENCRYPT | AES_FLAGS_CBC);
> +}
> +
> +static int atmel_aes_cbc_decrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_CBC);
> +}
> +
> +static int atmel_aes_ofb_encrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_ENCRYPT | AES_FLAGS_OFB);
> +}
> +
> +static int atmel_aes_ofb_decrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_OFB);
> +}
> +
> +static int atmel_aes_cfb_encrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_ENCRYPT | AES_FLAGS_CFB);
> +}
> +
> +static int atmel_aes_cfb_decrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_CFB);
> +}
> +
> +static int atmel_aes_cfb64_encrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB64);
> +}
> +
> +static int atmel_aes_cfb64_decrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_CFB | AES_FLAGS_CFB64);
> +}
> +
> +static int atmel_aes_cfb32_encrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB32);
> +}
> +
> +static int atmel_aes_cfb32_decrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_CFB | AES_FLAGS_CFB32);
> +}
> +
> +static int atmel_aes_cfb16_encrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB16);
> +}
> +
> +static int atmel_aes_cfb16_decrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_CFB | AES_FLAGS_CFB16);
> +}
> +
> +static int atmel_aes_cfb8_encrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB8);
> +}
> +
> +static int atmel_aes_cfb8_decrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_CFB | AES_FLAGS_CFB8);
> +}
> +
> +static int atmel_aes_ctr_encrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_ENCRYPT | AES_FLAGS_CTR);
> +}
> +
> +static int atmel_aes_ctr_decrypt(struct ablkcipher_request *req)
> +{
> + return atmel_aes_crypt(req,
> + AES_FLAGS_CTR);
> +}
> +
> +static int atmel_aes_cra_init(struct crypto_tfm *tfm)
> +{
> + tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_aes_reqctx);
> +
> + return 0;
> +}
> +
> +static void atmel_aes_cra_exit(struct crypto_tfm *tfm)
> +{
> +}
> +
> +static struct crypto_alg aes_algs[] = {
> +{
> + .cra_name = "ecb(aes)",
> + .cra_driver_name = "atmel-ecb-aes",
> + .cra_priority = 100,
> + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
> + .cra_blocksize = AES_BLOCK_SIZE,
> + .cra_ctxsize = sizeof(struct atmel_aes_ctx),
> + .cra_alignmask = 0x0,
> + .cra_type = &crypto_ablkcipher_type,
> + .cra_module = THIS_MODULE,
> + .cra_init = atmel_aes_cra_init,
> + .cra_exit = atmel_aes_cra_exit,
> + .cra_u.ablkcipher = {
> + .min_keysize = AES_MIN_KEY_SIZE,
> + .max_keysize = AES_MAX_KEY_SIZE,
> + .setkey = atmel_aes_setkey,
> + .encrypt = atmel_aes_ecb_encrypt,
> + .decrypt = atmel_aes_ecb_decrypt,
> + }
> +},
> +{
> + .cra_name = "cbc(aes)",
> + .cra_driver_name = "atmel-cbc-aes",
> + .cra_priority = 100,
> + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
> + .cra_blocksize = AES_BLOCK_SIZE,
> + .cra_ctxsize = sizeof(struct atmel_aes_ctx),
> + .cra_alignmask = 0x0,
> + .cra_type = &crypto_ablkcipher_type,
> + .cra_module = THIS_MODULE,
> + .cra_init = atmel_aes_cra_init,
> + .cra_exit = atmel_aes_cra_exit,
> + .cra_u.ablkcipher = {
> + .min_keysize = AES_MIN_KEY_SIZE,
> + .max_keysize = AES_MAX_KEY_SIZE,
> + .ivsize = AES_BLOCK_SIZE,
> + .setkey = atmel_aes_setkey,
> + .encrypt = atmel_aes_cbc_encrypt,
> + .decrypt = atmel_aes_cbc_decrypt,
> + }
> +},
> +{
> + .cra_name = "ofb(aes)",
> + .cra_driver_name = "atmel-ofb-aes",
> + .cra_priority = 100,
> + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
> + .cra_blocksize = AES_BLOCK_SIZE,
> + .cra_ctxsize = sizeof(struct atmel_aes_ctx),
> + .cra_alignmask = 0x0,
> + .cra_type = &crypto_ablkcipher_type,
> + .cra_module = THIS_MODULE,
> + .cra_init = atmel_aes_cra_init,
> + .cra_exit = atmel_aes_cra_exit,
> + .cra_u.ablkcipher = {
> + .min_keysize = AES_MIN_KEY_SIZE,
> + .max_keysize = AES_MAX_KEY_SIZE,
> + .ivsize = AES_BLOCK_SIZE,
> + .setkey = atmel_aes_setkey,
> + .encrypt = atmel_aes_ofb_encrypt,
> + .decrypt = atmel_aes_ofb_decrypt,
> + }
> +},
> +{
> + .cra_name = "cfb(aes)",
> + .cra_driver_name = "atmel-cfb-aes",
> + .cra_priority = 100,
> + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
> + .cra_blocksize = AES_BLOCK_SIZE,
> + .cra_ctxsize = sizeof(struct atmel_aes_ctx),
> + .cra_alignmask = 0x0,
> + .cra_type = &crypto_ablkcipher_type,
> + .cra_module = THIS_MODULE,
> + .cra_init = atmel_aes_cra_init,
> + .cra_exit = atmel_aes_cra_exit,
> + .cra_u.ablkcipher = {
> + .min_keysize = AES_MIN_KEY_SIZE,
> + .max_keysize = AES_MAX_KEY_SIZE,
> + .ivsize = AES_BLOCK_SIZE,
> + .setkey = atmel_aes_setkey,
> + .encrypt = atmel_aes_cfb_encrypt,
> + .decrypt = atmel_aes_cfb_decrypt,
> + }
> +},
> +{
> + .cra_name = "cfb32(aes)",
> + .cra_driver_name = "atmel-cfb32-aes",
> + .cra_priority = 100,
> + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
> + .cra_blocksize = CFB32_BLOCK_SIZE,
> + .cra_ctxsize = sizeof(struct atmel_aes_ctx),
> + .cra_alignmask = 0x0,
> + .cra_type = &crypto_ablkcipher_type,
> + .cra_module = THIS_MODULE,
> + .cra_init = atmel_aes_cra_init,
> + .cra_exit = atmel_aes_cra_exit,
> + .cra_u.ablkcipher = {
> + .min_keysize = AES_MIN_KEY_SIZE,
> + .max_keysize = AES_MAX_KEY_SIZE,
> + .ivsize = AES_BLOCK_SIZE,
> + .setkey = atmel_aes_setkey,
> + .encrypt = atmel_aes_cfb32_encrypt,
> + .decrypt = atmel_aes_cfb32_decrypt,
> + }
> +},
> +{
> + .cra_name = "cfb16(aes)",
> + .cra_driver_name = "atmel-cfb16-aes",
> + .cra_priority = 100,
> + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
> + .cra_blocksize = CFB16_BLOCK_SIZE,
> + .cra_ctxsize = sizeof(struct atmel_aes_ctx),
> + .cra_alignmask = 0x0,
> + .cra_type = &crypto_ablkcipher_type,
> + .cra_module = THIS_MODULE,
> + .cra_init = atmel_aes_cra_init,
> + .cra_exit = atmel_aes_cra_exit,
> + .cra_u.ablkcipher = {
> + .min_keysize = AES_MIN_KEY_SIZE,
> + .max_keysize = AES_MAX_KEY_SIZE,
> + .ivsize = AES_BLOCK_SIZE,
> + .setkey = atmel_aes_setkey,
> + .encrypt = atmel_aes_cfb16_encrypt,
> + .decrypt = atmel_aes_cfb16_decrypt,
> + }
> +},
> +{
> + .cra_name = "cfb8(aes)",
> + .cra_driver_name = "atmel-cfb8-aes",
> + .cra_priority = 100,
> + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
> + .cra_blocksize = CFB64_BLOCK_SIZE,
> + .cra_ctxsize = sizeof(struct atmel_aes_ctx),
> + .cra_alignmask = 0x0,
> + .cra_type = &crypto_ablkcipher_type,
> + .cra_module = THIS_MODULE,
> + .cra_init = atmel_aes_cra_init,
> + .cra_exit = atmel_aes_cra_exit,
> + .cra_u.ablkcipher = {
> + .min_keysize = AES_MIN_KEY_SIZE,
> + .max_keysize = AES_MAX_KEY_SIZE,
> + .ivsize = AES_BLOCK_SIZE,
> + .setkey = atmel_aes_setkey,
> + .encrypt = atmel_aes_cfb8_encrypt,
> + .decrypt = atmel_aes_cfb8_decrypt,
> + }
> +},
> +{
> + .cra_name = "ctr(aes)",
> + .cra_driver_name = "atmel-ctr-aes",
> + .cra_priority = 100,
> + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
> + .cra_blocksize = AES_BLOCK_SIZE,
> + .cra_ctxsize = sizeof(struct atmel_aes_ctx),
> + .cra_alignmask = 0x0,
> + .cra_type = &crypto_ablkcipher_type,
> + .cra_module = THIS_MODULE,
> + .cra_init = atmel_aes_cra_init,
> + .cra_exit = atmel_aes_cra_exit,
> + .cra_u.ablkcipher = {
> + .min_keysize = AES_MIN_KEY_SIZE,
> + .max_keysize = AES_MAX_KEY_SIZE,
> + .ivsize = AES_BLOCK_SIZE,
> + .setkey = atmel_aes_setkey,
> + .encrypt = atmel_aes_ctr_encrypt,
> + .decrypt = atmel_aes_ctr_decrypt,
> + }
> +},
> +};
> +
> +static struct crypto_alg aes_cfb64_alg[] = {
> +{
> + .cra_name = "cfb64(aes)",
> + .cra_driver_name = "atmel-cfb64-aes",
> + .cra_priority = 100,
> + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
> + .cra_blocksize = CFB64_BLOCK_SIZE,
> + .cra_ctxsize = sizeof(struct atmel_aes_ctx),
> + .cra_alignmask = 0x0,
> + .cra_type = &crypto_ablkcipher_type,
> + .cra_module = THIS_MODULE,
> + .cra_init = atmel_aes_cra_init,
> + .cra_exit = atmel_aes_cra_exit,
> + .cra_u.ablkcipher = {
> + .min_keysize = AES_MIN_KEY_SIZE,
> + .max_keysize = AES_MAX_KEY_SIZE,
> + .ivsize = AES_BLOCK_SIZE,
> + .setkey = atmel_aes_setkey,
> + .encrypt = atmel_aes_cfb64_encrypt,
> + .decrypt = atmel_aes_cfb64_decrypt,
> + }
> +},
> +};
> +
> +static void atmel_aes_queue_task(unsigned long data)
> +{
> + struct atmel_aes_dev *dd = (struct atmel_aes_dev *)data;
> +
> + atmel_aes_handle_queue(dd, NULL);
> +}
> +
> +static void atmel_aes_done_task(unsigned long data)
> +{
> + struct atmel_aes_dev *dd = (struct atmel_aes_dev *) data;
> + int err;
> +
> + if (!(dd->flags & AES_FLAGS_DMA)) {
> + atmel_aes_read_n(dd, AES_ODATAR(0), (u32 *) dd->buf_out,
> + dd->bufcnt >> 2);
> +
> + if (sg_copy_from_buffer(dd->out_sg, dd->nb_out_sg,
> + dd->buf_out, dd->bufcnt))
> + err = 0;
> + else
> + err = -EINVAL;
> +
> + goto cpu_end;
> + }
> +
> + err = atmel_aes_crypt_dma_stop(dd);
> +
> + err = dd->err ? : err;
> +
> + if (dd->total && !err) {
> + err = atmel_aes_crypt_dma_start(dd);
> + if (!err)
> + return; /* DMA started. Not fininishing. */
> + }
> +
> +cpu_end:
> + atmel_aes_finish_req(dd, err);
> + atmel_aes_handle_queue(dd, NULL);
> +}
> +
> +static irqreturn_t atmel_aes_irq(int irq, void *dev_id)
> +{
> + struct atmel_aes_dev *aes_dd = dev_id;
> + u32 reg;
> +
> + reg = atmel_aes_read(aes_dd, AES_ISR);
> + if (reg & atmel_aes_read(aes_dd, AES_IMR)) {
> + atmel_aes_write(aes_dd, AES_IDR, reg);
> + if (AES_FLAGS_BUSY & aes_dd->flags)
> + tasklet_schedule(&aes_dd->done_task);
> + else
> + dev_warn(aes_dd->dev, "AES interrupt when no active requests.\n");
> + return IRQ_HANDLED;
> + }
> +
> + return IRQ_NONE;
> +}
> +
> +static void atmel_aes_unregister_algs(struct atmel_aes_dev *dd)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(aes_algs); i++)
> + crypto_unregister_alg(&aes_algs[i]);
> + if (dd->hw_version >= 0x130)
> + crypto_unregister_alg(&aes_cfb64_alg[0]);
> +}
> +
> +static int atmel_aes_register_algs(struct atmel_aes_dev *dd)
> +{
> + int err, i, j;
> +
> + for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
> + INIT_LIST_HEAD(&aes_algs[i].cra_list);
> + err = crypto_register_alg(&aes_algs[i]);
> + if (err)
> + goto err_aes_algs;
> + }
> +
> + atmel_aes_hw_version_init(dd);
> +
> + if (dd->hw_version >= 0x130) {
> + INIT_LIST_HEAD(&aes_cfb64_alg[0].cra_list);
> + err = crypto_register_alg(&aes_cfb64_alg[0]);
> + if (err)
> + goto err_aes_cfb64_alg;
> + }
> +
> + return 0;
> +
> +err_aes_cfb64_alg:
> + i = ARRAY_SIZE(aes_algs);
> +err_aes_algs:
> + for (j = 0; j < i; j++)
> + crypto_unregister_alg(&aes_algs[j]);
> +
> + return err;
> +}
> +
> +static int __devinit atmel_aes_probe(struct platform_device *pdev)
> +{
> + struct atmel_aes_dev *aes_dd;
> + struct aes_platform_data *pdata;
> + struct device *dev = &pdev->dev;
> + struct resource *aes_res;
> + unsigned long aes_phys_size;
> + int err;
> +
> + pdata = pdev->dev.platform_data;
> + if (!pdata) {
> + err = -ENXIO;
> + goto aes_dd_err;
> + }
> +
> + aes_dd = kzalloc(sizeof(struct atmel_aes_dev), GFP_KERNEL);
> + if (aes_dd == NULL) {
> + dev_err(dev, "unable to alloc data struct.\n");
> + err = -ENOMEM;
> + goto aes_dd_err;
> + }
> +
> + aes_dd->dev = dev;
> +
> + platform_set_drvdata(pdev, aes_dd);
> +
> + INIT_LIST_HEAD(&aes_dd->list);
> +
> + tasklet_init(&aes_dd->done_task, atmel_aes_done_task,
> + (unsigned long)aes_dd);
> + tasklet_init(&aes_dd->queue_task, atmel_aes_queue_task,
> + (unsigned long)aes_dd);
> +
> + crypto_init_queue(&aes_dd->queue, ATMEL_AES_QUEUE_LENGTH);
> +
> + aes_dd->irq = -1;
> +
> + /* Get the base address */
> + aes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!aes_res) {
> + dev_err(dev, "no MEM resource info\n");
> + err = -ENODEV;
> + goto res_err;
> + }
> + aes_dd->phys_base = aes_res->start;
> + aes_phys_size = resource_size(aes_res);
> +
> + /* Get the IRQ */
> + aes_dd->irq = platform_get_irq(pdev, 0);
> + if (aes_dd->irq < 0) {
> + dev_err(dev, "no IRQ resource info\n");
> + err = aes_dd->irq;
> + goto aes_irq_err;
> + }
> +
> + err = request_irq(aes_dd->irq, atmel_aes_irq, IRQF_SHARED, "atmel-aes",
> + aes_dd);
> + if (err) {
> + dev_err(dev, "unable to request aes irq.\n");
> + goto aes_irq_err;
> + }
> +
> + /* Initializing the clock */
> + aes_dd->iclk = clk_get(&pdev->dev, NULL);
> + if (IS_ERR(aes_dd->iclk)) {
> + dev_err(dev, "clock intialization failed.\n");
> + err = PTR_ERR(aes_dd->iclk);
> + goto clk_err;
> + }
> +
> + aes_dd->io_base = ioremap(aes_dd->phys_base, aes_phys_size);
> + if (!aes_dd->io_base) {
> + dev_err(dev, "can't ioremap\n");
> + err = -ENOMEM;
> + goto aes_io_err;
> + }
> +
> + err = atmel_aes_dma_init(aes_dd);
> + if (err)
> + goto err_aes_dma;
> +
> + spin_lock(&atmel_aes.lock);
> + list_add_tail(&aes_dd->list, &atmel_aes.dev_list);
> + spin_unlock(&atmel_aes.lock);
> +
> + err = atmel_aes_register_algs(aes_dd);
> + if (err)
> + goto err_algs;
> +
> + dev_info(dev, "Atmel AES\n");
> +
> + return 0;
> +
> +err_algs:
> + spin_lock(&atmel_aes.lock);
> + list_del(&aes_dd->list);
> + spin_unlock(&atmel_aes.lock);
> + atmel_aes_dma_cleanup(aes_dd);
> +err_aes_dma:
> + iounmap(aes_dd->io_base);
> +aes_io_err:
> + clk_put(aes_dd->iclk);
> +clk_err:
> + free_irq(aes_dd->irq, aes_dd);
> +aes_irq_err:
> +res_err:
> + tasklet_kill(&aes_dd->done_task);
> + tasklet_kill(&aes_dd->queue_task);
> + kfree(aes_dd);
> + aes_dd = NULL;
> +aes_dd_err:
> + dev_err(dev, "initialization failed.\n");
> +
> + return err;
> +}
> +
> +static int __devexit atmel_aes_remove(struct platform_device *pdev)
> +{
> + static struct atmel_aes_dev *aes_dd;
> +
> + aes_dd = platform_get_drvdata(pdev);
> + if (!aes_dd)
> + return -ENODEV;
> + spin_lock(&atmel_aes.lock);
> + list_del(&aes_dd->list);
> + spin_unlock(&atmel_aes.lock);
> +
> + atmel_aes_unregister_algs(aes_dd);
> +
> + tasklet_kill(&aes_dd->done_task);
> + tasklet_kill(&aes_dd->queue_task);
> +
> + atmel_aes_dma_cleanup(aes_dd);
> +
> + iounmap(aes_dd->io_base);
> +
> + clk_put(aes_dd->iclk);
> +
> + if (aes_dd->irq > 0)
> + free_irq(aes_dd->irq, aes_dd);
> +
> + kfree(aes_dd);
> + aes_dd = NULL;
> +
> + return 0;
> +}
> +
> +static struct platform_driver atmel_aes_driver = {
> + .probe = atmel_aes_probe,
> + .remove = __devexit_p(atmel_aes_remove),
> + .driver = {
> + .name = "atmel_aes",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +module_platform_driver(atmel_aes_driver);
> +
> +MODULE_DESCRIPTION("Atmel AES hw acceleration support.");
> +MODULE_LICENSE("GPL v2");
> +MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
> --
> 1.7.7.6
>