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linux/drivers/crypto/atmel-aes.c
Nicolas Ferre be943c7d27 crypto: atmel-aes - add support for Device Tree 
Add support for Device Tree and use of the DMA DT API to
get the needed channels.
Documentation is added for these DT nodes.

Initial code by: Nicolas Royer and Eukrea.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
2013-12-12 18:39:35 +01:00

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/*
* 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/init.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/of_device.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/crypto-atmel.h>
#include <dt-bindings/dma/at91.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 0x03ff
#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_CFB128 BIT(7)
#define AES_FLAGS_OFB BIT(8)
#define AES_FLAGS_CTR BIT(9)
#define AES_FLAGS_INIT BIT(16)
#define AES_FLAGS_DMA BIT(17)
#define AES_FLAGS_BUSY BIT(18)
#define AES_FLAGS_FAST BIT(19)
#define ATMEL_AES_QUEUE_LENGTH 50
#define ATMEL_AES_DMA_THRESHOLD 16
struct atmel_aes_caps {
bool has_dualbuff;
bool has_cfb64;
u32 max_burst_size;
};
struct atmel_aes_dev;
struct atmel_aes_ctx {
struct atmel_aes_dev *dd;
int keylen;
u32 key[AES_KEYSIZE_256 / sizeof(u32)];
u16 block_size;
};
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;
size_t in_offset;
struct scatterlist *out_sg;
unsigned int nb_out_sg;
size_t out_offset;
size_t bufcnt;
size_t buflen;
size_t dma_size;
void *buf_in;
int dma_in;
dma_addr_t dma_addr_in;
struct atmel_aes_dma dma_lch_in;
void *buf_out;
int dma_out;
dma_addr_t dma_addr_out;
struct atmel_aes_dma dma_lch_out;
struct atmel_aes_caps caps;
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 int atmel_aes_sg_copy(struct scatterlist **sg, size_t *offset,
void *buf, size_t buflen, size_t total, int out)
{
unsigned int count, off = 0;
while (buflen && total) {
count = min((*sg)->length - *offset, total);
count = min(count, buflen);
if (!count)
return off;
scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out);
off += count;
buflen -= count;
*offset += count;
total -= count;
if (*offset == (*sg)->length) {
*sg = sg_next(*sg);
if (*sg)
*offset = 0;
else
total = 0;
}
}
return off;
}
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 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)) {
atmel_aes_write(dd, AES_CR, AES_CR_SWRST);
atmel_aes_write(dd, AES_MR, 0xE << AES_MR_CKEY_OFFSET);
dd->flags |= AES_FLAGS_INIT;
dd->err = 0;
}
return 0;
}
static inline unsigned int atmel_aes_get_version(struct atmel_aes_dev *dd)
{
return atmel_aes_read(dd, AES_HW_VERSION) & 0x00000fff;
}
static void atmel_aes_hw_version_init(struct atmel_aes_dev *dd)
{
atmel_aes_hw_init(dd);
dd->hw_version = atmel_aes_get_version(dd);
dev_info(dd->dev,
"version: 0x%x\n", dd->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,
dma_addr_t dma_addr_in, dma_addr_t dma_addr_out, int length)
{
struct scatterlist sg[2];
struct dma_async_tx_descriptor *in_desc, *out_desc;
dd->dma_size = length;
if (!(dd->flags & AES_FLAGS_FAST)) {
dma_sync_single_for_device(dd->dev, dma_addr_in, length,
DMA_TO_DEVICE);
}
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;
}
if (dd->flags & (AES_FLAGS_CFB8 | AES_FLAGS_CFB16 |
AES_FLAGS_CFB32 | AES_FLAGS_CFB64)) {
dd->dma_lch_in.dma_conf.src_maxburst = 1;
dd->dma_lch_in.dma_conf.dst_maxburst = 1;
dd->dma_lch_out.dma_conf.src_maxburst = 1;
dd->dma_lch_out.dma_conf.dst_maxburst = 1;
} else {
dd->dma_lch_in.dma_conf.src_maxburst = dd->caps.max_burst_size;
dd->dma_lch_in.dma_conf.dst_maxburst = dd->caps.max_burst_size;
dd->dma_lch_out.dma_conf.src_maxburst = dd->caps.max_burst_size;
dd->dma_lch_out.dma_conf.dst_maxburst = dd->caps.max_burst_size;
}
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;
sg_init_table(&sg[0], 1);
sg_dma_address(&sg[0]) = dma_addr_in;
sg_dma_len(&sg[0]) = length;
sg_init_table(&sg[1], 1);
sg_dma_address(&sg[1]) = dma_addr_out;
sg_dma_len(&sg[1]) = length;
in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0],
1, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!in_desc)
return -EINVAL;
out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1],
1, DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!out_desc)
return -EINVAL;
out_desc->callback = atmel_aes_dma_callback;
out_desc->callback_param = dd;
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;
}
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_out_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, fast = 0, in, out;
size_t count;
dma_addr_t addr_in, addr_out;
if ((!dd->in_offset) && (!dd->out_offset)) {
/* check for alignment */
in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) &&
IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size);
out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) &&
IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size);
fast = in && out;
if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg))
fast = 0;
}
if (fast) {
count = min(dd->total, sg_dma_len(dd->in_sg));
count = min(count, sg_dma_len(dd->out_sg));
err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
if (!err) {
dev_err(dd->dev, "dma_map_sg() error\n");
return -EINVAL;
}
err = dma_map_sg(dd->dev, dd->out_sg, 1,
DMA_FROM_DEVICE);
if (!err) {
dev_err(dd->dev, "dma_map_sg() error\n");
dma_unmap_sg(dd->dev, dd->in_sg, 1,
DMA_TO_DEVICE);
return -EINVAL;
}
addr_in = sg_dma_address(dd->in_sg);
addr_out = sg_dma_address(dd->out_sg);
dd->flags |= AES_FLAGS_FAST;
} else {
/* use cache buffers */
count = atmel_aes_sg_copy(&dd->in_sg, &dd->in_offset,
dd->buf_in, dd->buflen, dd->total, 0);
addr_in = dd->dma_addr_in;
addr_out = dd->dma_addr_out;
dd->flags &= ~AES_FLAGS_FAST;
}
dd->total -= count;
err = atmel_aes_crypt_dma(dd, addr_in, addr_out, count);
if (err && (dd->flags & AES_FLAGS_FAST)) {
dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
}
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_CFB128)
valmr |= AES_MR_CFBS_128b;
} 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->caps.has_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_offset = 0;
dd->in_sg = req->src;
dd->out_offset = 0;
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;
size_t count;
if (dd->flags & AES_FLAGS_DMA) {
err = 0;
if (dd->flags & AES_FLAGS_FAST) {
dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
} else {
dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
dd->dma_size, DMA_FROM_DEVICE);
/* copy data */
count = atmel_aes_sg_copy(&dd->out_sg, &dd->out_offset,
dd->buf_out, dd->buflen, dd->dma_size, 1);
if (count != dd->dma_size) {
err = -EINVAL;
pr_err("not all data converted: %u\n", count);
}
}
}
return err;
}
static int atmel_aes_buff_init(struct atmel_aes_dev *dd)
{
int err = -ENOMEM;
dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0);
dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0);
dd->buflen = PAGE_SIZE;
dd->buflen &= ~(AES_BLOCK_SIZE - 1);
if (!dd->buf_in || !dd->buf_out) {
dev_err(dd->dev, "unable to alloc pages.\n");
goto err_alloc;
}
/* MAP here */
dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in,
dd->buflen, DMA_TO_DEVICE);
if (dma_mapping_error(dd->dev, dd->dma_addr_in)) {
dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
err = -EINVAL;
goto err_map_in;
}
dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
dd->buflen, DMA_FROM_DEVICE);
if (dma_mapping_error(dd->dev, dd->dma_addr_out)) {
dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
err = -EINVAL;
goto err_map_out;
}
return 0;
err_map_out:
dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
DMA_TO_DEVICE);
err_map_in:
free_page((unsigned long)dd->buf_out);
free_page((unsigned long)dd->buf_in);
err_alloc:
if (err)
pr_err("error: %d\n", err);
return err;
}
static void atmel_aes_buff_cleanup(struct atmel_aes_dev *dd)
{
dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
DMA_FROM_DEVICE);
dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
DMA_TO_DEVICE);
free_page((unsigned long)dd->buf_out);
free_page((unsigned long)dd->buf_in);
}
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 (mode & AES_FLAGS_CFB8) {
if (!IS_ALIGNED(req->nbytes, CFB8_BLOCK_SIZE)) {
pr_err("request size is not exact amount of CFB8 blocks\n");
return -EINVAL;
}
ctx->block_size = CFB8_BLOCK_SIZE;
} else if (mode & AES_FLAGS_CFB16) {
if (!IS_ALIGNED(req->nbytes, CFB16_BLOCK_SIZE)) {
pr_err("request size is not exact amount of CFB16 blocks\n");
return -EINVAL;
}
ctx->block_size = CFB16_BLOCK_SIZE;
} else if (mode & AES_FLAGS_CFB32) {
if (!IS_ALIGNED(req->nbytes, CFB32_BLOCK_SIZE)) {
pr_err("request size is not exact amount of CFB32 blocks\n");
return -EINVAL;
}
ctx->block_size = CFB32_BLOCK_SIZE;
} else {
if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
pr_err("request size is not exact amount of AES blocks\n");
return -EINVAL;
}
ctx->block_size = AES_BLOCK_SIZE;
}
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,
struct crypto_platform_data *pdata)
{
int err = -ENOMEM;
dma_cap_mask_t mask;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
/* Try to grab 2 DMA channels */
dd->dma_lch_in.chan = dma_request_slave_channel_compat(mask,
atmel_aes_filter, &pdata->dma_slave->rxdata, dd->dev, "tx");
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 = dd->caps.max_burst_size;
dd->dma_lch_in.dma_conf.src_addr_width =
DMA_SLAVE_BUSWIDTH_4_BYTES;
dd->dma_lch_in.dma_conf.dst_maxburst = dd->caps.max_burst_size;
dd->dma_lch_in.dma_conf.dst_addr_width =
DMA_SLAVE_BUSWIDTH_4_BYTES;
dd->dma_lch_in.dma_conf.device_fc = false;
dd->dma_lch_out.chan = dma_request_slave_channel_compat(mask,
atmel_aes_filter, &pdata->dma_slave->txdata, dd->dev, "rx");
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 = dd->caps.max_burst_size;
dd->dma_lch_out.dma_conf.src_addr_width =
DMA_SLAVE_BUSWIDTH_4_BYTES;
dd->dma_lch_out.dma_conf.dst_maxburst = dd->caps.max_burst_size;
dd->dma_lch_out.dma_conf.dst_addr_width =
DMA_SLAVE_BUSWIDTH_4_BYTES;
dd->dma_lch_out.dma_conf.device_fc = false;
return 0;
err_dma_out:
dma_release_channel(dd->dma_lch_in.chan);
err_dma_in:
dev_warn(dd->dev, "no DMA channel available\n");
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 | AES_FLAGS_CFB128);
}
static int atmel_aes_cfb_decrypt(struct ablkcipher_request *req)
{
return atmel_aes_crypt(req,
AES_FLAGS_CFB | AES_FLAGS_CFB128);
}
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 = 0xf,
.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 = 0xf,
.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 = 0xf,
.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 = 0xf,
.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 = 0x3,
.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 = 0x1,
.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 = 0xf,
.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 = 0x7,
.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) {
if (dd->flags & AES_FLAGS_FAST) {
dd->in_sg = sg_next(dd->in_sg);
dd->out_sg = sg_next(dd->out_sg);
if (!dd->in_sg || !dd->out_sg)
err = -EINVAL;
}
if (!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->caps.has_cfb64)
crypto_unregister_alg(&aes_cfb64_alg);
}
static int atmel_aes_register_algs(struct atmel_aes_dev *dd)
{
int err, i, j;
for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
err = crypto_register_alg(&aes_algs[i]);
if (err)
goto err_aes_algs;
}
if (dd->caps.has_cfb64) {
err = crypto_register_alg(&aes_cfb64_alg);
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 void atmel_aes_get_cap(struct atmel_aes_dev *dd)
{
dd->caps.has_dualbuff = 0;
dd->caps.has_cfb64 = 0;
dd->caps.max_burst_size = 1;
/* keep only major version number */
switch (dd->hw_version & 0xff0) {
case 0x130:
dd->caps.has_dualbuff = 1;
dd->caps.has_cfb64 = 1;
dd->caps.max_burst_size = 4;
break;
case 0x120:
break;
default:
dev_warn(dd->dev,
"Unmanaged aes version, set minimum capabilities\n");
break;
}
}
#if defined(CONFIG_OF)
static const struct of_device_id atmel_aes_dt_ids[] = {
{ .compatible = "atmel,at91sam9g46-aes" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, atmel_aes_dt_ids);
static struct crypto_platform_data *atmel_aes_of_init(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct crypto_platform_data *pdata;
if (!np) {
dev_err(&pdev->dev, "device node not found\n");
return ERR_PTR(-EINVAL);
}
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(&pdev->dev, "could not allocate memory for pdata\n");
return ERR_PTR(-ENOMEM);
}
pdata->dma_slave = devm_kzalloc(&pdev->dev,
sizeof(*(pdata->dma_slave)),
GFP_KERNEL);
if (!pdata->dma_slave) {
dev_err(&pdev->dev, "could not allocate memory for dma_slave\n");
devm_kfree(&pdev->dev, pdata);
return ERR_PTR(-ENOMEM);
}
return pdata;
}
#else
static inline struct crypto_platform_data *atmel_aes_of_init(struct platform_device *pdev)
{
return ERR_PTR(-EINVAL);
}
#endif
static int atmel_aes_probe(struct platform_device *pdev)
{
struct atmel_aes_dev *aes_dd;
struct crypto_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) {
pdata = atmel_aes_of_init(pdev);
if (IS_ERR(pdata)) {
err = PTR_ERR(pdata);
goto aes_dd_err;
}
}
if (!pdata->dma_slave) {
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, "aes_clk");
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;
}
atmel_aes_hw_version_init(aes_dd);
atmel_aes_get_cap(aes_dd);
err = atmel_aes_buff_init(aes_dd);
if (err)
goto err_aes_buff;
err = atmel_aes_dma_init(aes_dd, pdata);
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 - Using %s, %s for DMA transfers\n",
dma_chan_name(aes_dd->dma_lch_in.chan),
dma_chan_name(aes_dd->dma_lch_out.chan));
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:
atmel_aes_buff_cleanup(aes_dd);
err_aes_buff:
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 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 = atmel_aes_remove,
.driver = {
.name = "atmel_aes",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(atmel_aes_dt_ids),
},
};
module_platform_driver(atmel_aes_driver);
MODULE_DESCRIPTION("Atmel AES hw acceleration support.");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
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