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alistair23-linux/drivers/crypto/atmel-tdes.c
Eric Biggers 231baecdef crypto: clarify name of WEAK_KEY request flag 
CRYPTO_TFM_REQ_WEAK_KEY confuses newcomers to the crypto API because it
sounds like it is requesting a weak key.  Actually, it is requesting
that weak keys be forbidden (for algorithms that have the notion of
"weak keys"; currently only DES and XTS do).

Also it is only one letter away from CRYPTO_TFM_RES_WEAK_KEY, with which
it can be easily confused.  (This in fact happened in the UX500 driver,
though just in some debugging messages.)

Therefore, make the intent clear by renaming it to
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-01-25 18:41:52 +08:00

1497 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* Cryptographic API.
*
* Support for ATMEL DES/TDES HW acceleration.
*
* Copyright (c) 2012 Eukréa Electromatique - ATMEL
* Author: Nicolas Royer <nicolas@eukrea.com>
*
* Some ideas are from omap-aes.c drivers.
*/
#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/des.h>
#include <crypto/hash.h>
#include <crypto/internal/hash.h>
#include <linux/platform_data/crypto-atmel.h>
#include "atmel-tdes-regs.h"
/* TDES flags */
#define TDES_FLAGS_MODE_MASK 0x00ff
#define TDES_FLAGS_ENCRYPT BIT(0)
#define TDES_FLAGS_CBC BIT(1)
#define TDES_FLAGS_CFB BIT(2)
#define TDES_FLAGS_CFB8 BIT(3)
#define TDES_FLAGS_CFB16 BIT(4)
#define TDES_FLAGS_CFB32 BIT(5)
#define TDES_FLAGS_CFB64 BIT(6)
#define TDES_FLAGS_OFB BIT(7)
#define TDES_FLAGS_INIT BIT(16)
#define TDES_FLAGS_FAST BIT(17)
#define TDES_FLAGS_BUSY BIT(18)
#define TDES_FLAGS_DMA BIT(19)
#define ATMEL_TDES_QUEUE_LENGTH 50
#define CFB8_BLOCK_SIZE 1
#define CFB16_BLOCK_SIZE 2
#define CFB32_BLOCK_SIZE 4
struct atmel_tdes_caps {
bool has_dma;
u32 has_cfb_3keys;
};
struct atmel_tdes_dev;
struct atmel_tdes_ctx {
struct atmel_tdes_dev *dd;
int keylen;
u32 key[3*DES_KEY_SIZE / sizeof(u32)];
unsigned long flags;
u16 block_size;
};
struct atmel_tdes_reqctx {
unsigned long mode;
};
struct atmel_tdes_dma {
struct dma_chan *chan;
struct dma_slave_config dma_conf;
};
struct atmel_tdes_dev {
struct list_head list;
unsigned long phys_base;
void __iomem *io_base;
struct atmel_tdes_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 buflen;
size_t dma_size;
void *buf_in;
int dma_in;
dma_addr_t dma_addr_in;
struct atmel_tdes_dma dma_lch_in;
void *buf_out;
int dma_out;
dma_addr_t dma_addr_out;
struct atmel_tdes_dma dma_lch_out;
struct atmel_tdes_caps caps;
u32 hw_version;
};
struct atmel_tdes_drv {
struct list_head dev_list;
spinlock_t lock;
};
static struct atmel_tdes_drv atmel_tdes = {
.dev_list = LIST_HEAD_INIT(atmel_tdes.dev_list),
.lock = __SPIN_LOCK_UNLOCKED(atmel_tdes.lock),
};
static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset,
void *buf, size_t buflen, size_t total, int out)
{
size_t 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_tdes_read(struct atmel_tdes_dev *dd, u32 offset)
{
return readl_relaxed(dd->io_base + offset);
}
static inline void atmel_tdes_write(struct atmel_tdes_dev *dd,
u32 offset, u32 value)
{
writel_relaxed(value, dd->io_base + offset);
}
static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset,
u32 *value, int count)
{
for (; count--; value++, offset += 4)
atmel_tdes_write(dd, offset, *value);
}
static struct atmel_tdes_dev *atmel_tdes_find_dev(struct atmel_tdes_ctx *ctx)
{
struct atmel_tdes_dev *tdes_dd = NULL;
struct atmel_tdes_dev *tmp;
spin_lock_bh(&atmel_tdes.lock);
if (!ctx->dd) {
list_for_each_entry(tmp, &atmel_tdes.dev_list, list) {
tdes_dd = tmp;
break;
}
ctx->dd = tdes_dd;
} else {
tdes_dd = ctx->dd;
}
spin_unlock_bh(&atmel_tdes.lock);
return tdes_dd;
}
static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd)
{
int err;
err = clk_prepare_enable(dd->iclk);
if (err)
return err;
if (!(dd->flags & TDES_FLAGS_INIT)) {
atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST);
dd->flags |= TDES_FLAGS_INIT;
dd->err = 0;
}
return 0;
}
static inline unsigned int atmel_tdes_get_version(struct atmel_tdes_dev *dd)
{
return atmel_tdes_read(dd, TDES_HW_VERSION) & 0x00000fff;
}
static void atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd)
{
atmel_tdes_hw_init(dd);
dd->hw_version = atmel_tdes_get_version(dd);
dev_info(dd->dev,
"version: 0x%x\n", dd->hw_version);
clk_disable_unprepare(dd->iclk);
}
static void atmel_tdes_dma_callback(void *data)
{
struct atmel_tdes_dev *dd = data;
/* dma_lch_out - completed */
tasklet_schedule(&dd->done_task);
}
static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd)
{
int err;
u32 valcr = 0, valmr = TDES_MR_SMOD_PDC;
err = atmel_tdes_hw_init(dd);
if (err)
return err;
if (!dd->caps.has_dma)
atmel_tdes_write(dd, TDES_PTCR,
TDES_PTCR_TXTDIS | TDES_PTCR_RXTDIS);
/* MR register must be set before IV registers */
if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) {
valmr |= TDES_MR_KEYMOD_3KEY;
valmr |= TDES_MR_TDESMOD_TDES;
} else if (dd->ctx->keylen > DES_KEY_SIZE) {
valmr |= TDES_MR_KEYMOD_2KEY;
valmr |= TDES_MR_TDESMOD_TDES;
} else {
valmr |= TDES_MR_TDESMOD_DES;
}
if (dd->flags & TDES_FLAGS_CBC) {
valmr |= TDES_MR_OPMOD_CBC;
} else if (dd->flags & TDES_FLAGS_CFB) {
valmr |= TDES_MR_OPMOD_CFB;
if (dd->flags & TDES_FLAGS_CFB8)
valmr |= TDES_MR_CFBS_8b;
else if (dd->flags & TDES_FLAGS_CFB16)
valmr |= TDES_MR_CFBS_16b;
else if (dd->flags & TDES_FLAGS_CFB32)
valmr |= TDES_MR_CFBS_32b;
else if (dd->flags & TDES_FLAGS_CFB64)
valmr |= TDES_MR_CFBS_64b;
} else if (dd->flags & TDES_FLAGS_OFB) {
valmr |= TDES_MR_OPMOD_OFB;
}
if ((dd->flags & TDES_FLAGS_ENCRYPT) || (dd->flags & TDES_FLAGS_OFB))
valmr |= TDES_MR_CYPHER_ENC;
atmel_tdes_write(dd, TDES_CR, valcr);
atmel_tdes_write(dd, TDES_MR, valmr);
atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key,
dd->ctx->keylen >> 2);
if (((dd->flags & TDES_FLAGS_CBC) || (dd->flags & TDES_FLAGS_CFB) ||
(dd->flags & TDES_FLAGS_OFB)) && dd->req->info) {
atmel_tdes_write_n(dd, TDES_IV1R, dd->req->info, 2);
}
return 0;
}
static int atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev *dd)
{
int err = 0;
size_t count;
atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
if (dd->flags & TDES_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_tdes_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: %zu\n", count);
}
}
return err;
}
static int atmel_tdes_buff_init(struct atmel_tdes_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 &= ~(DES_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 %zd 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 %zd 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:
err_alloc:
free_page((unsigned long)dd->buf_out);
free_page((unsigned long)dd->buf_in);
if (err)
pr_err("error: %d\n", err);
return err;
}
static void atmel_tdes_buff_cleanup(struct atmel_tdes_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_tdes_crypt_pdc(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
dma_addr_t dma_addr_out, int length)
{
struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
struct atmel_tdes_dev *dd = ctx->dd;
int len32;
dd->dma_size = length;
if (!(dd->flags & TDES_FLAGS_FAST)) {
dma_sync_single_for_device(dd->dev, dma_addr_in, length,
DMA_TO_DEVICE);
}
if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB8))
len32 = DIV_ROUND_UP(length, sizeof(u8));
else if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB16))
len32 = DIV_ROUND_UP(length, sizeof(u16));
else
len32 = DIV_ROUND_UP(length, sizeof(u32));
atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
atmel_tdes_write(dd, TDES_TPR, dma_addr_in);
atmel_tdes_write(dd, TDES_TCR, len32);
atmel_tdes_write(dd, TDES_RPR, dma_addr_out);
atmel_tdes_write(dd, TDES_RCR, len32);
/* Enable Interrupt */
atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX);
/* Start DMA transfer */
atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN);
return 0;
}
static int atmel_tdes_crypt_dma(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
dma_addr_t dma_addr_out, int length)
{
struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
struct atmel_tdes_dev *dd = ctx->dd;
struct scatterlist sg[2];
struct dma_async_tx_descriptor *in_desc, *out_desc;
dd->dma_size = length;
if (!(dd->flags & TDES_FLAGS_FAST)) {
dma_sync_single_for_device(dd->dev, dma_addr_in, length,
DMA_TO_DEVICE);
}
if (dd->flags & TDES_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 & TDES_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 |= TDES_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_tdes_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_tdes_crypt_start(struct atmel_tdes_dev *dd)
{
struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
crypto_ablkcipher_reqtfm(dd->req));
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_t(size_t, dd->total, sg_dma_len(dd->in_sg));
count = min_t(size_t, 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 |= TDES_FLAGS_FAST;
} else {
/* use cache buffers */
count = atmel_tdes_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 &= ~TDES_FLAGS_FAST;
}
dd->total -= count;
if (dd->caps.has_dma)
err = atmel_tdes_crypt_dma(tfm, addr_in, addr_out, count);
else
err = atmel_tdes_crypt_pdc(tfm, addr_in, addr_out, count);
if (err && (dd->flags & TDES_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 void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err)
{
struct ablkcipher_request *req = dd->req;
clk_disable_unprepare(dd->iclk);
dd->flags &= ~TDES_FLAGS_BUSY;
req->base.complete(&req->base, err);
}
static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd,
struct ablkcipher_request *req)
{
struct crypto_async_request *async_req, *backlog;
struct atmel_tdes_ctx *ctx;
struct atmel_tdes_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 & TDES_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 |= TDES_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 &= TDES_FLAGS_MODE_MASK;
dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode;
dd->ctx = ctx;
ctx->dd = dd;
err = atmel_tdes_write_ctrl(dd);
if (!err)
err = atmel_tdes_crypt_start(dd);
if (err) {
/* des_task will not finish it, so do it here */
atmel_tdes_finish_req(dd, err);
tasklet_schedule(&dd->queue_task);
}
return ret;
}
static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd)
{
int err = -EINVAL;
size_t count;
if (dd->flags & TDES_FLAGS_DMA) {
err = 0;
if (dd->flags & TDES_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_tdes_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: %zu\n", count);
}
}
}
return err;
}
static int atmel_tdes_crypt(struct ablkcipher_request *req, unsigned long mode)
{
struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(
crypto_ablkcipher_reqtfm(req));
struct atmel_tdes_reqctx *rctx = ablkcipher_request_ctx(req);
if (mode & TDES_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 & TDES_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 & TDES_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, DES_BLOCK_SIZE)) {
pr_err("request size is not exact amount of DES blocks\n");
return -EINVAL;
}
ctx->block_size = DES_BLOCK_SIZE;
}
rctx->mode = mode;
return atmel_tdes_handle_queue(ctx->dd, req);
}
static bool atmel_tdes_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_tdes_dma_init(struct atmel_tdes_dev *dd,
struct crypto_platform_data *pdata)
{
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_tdes_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 +
TDES_IDATA1R;
dd->dma_lch_in.dma_conf.src_maxburst = 1;
dd->dma_lch_in.dma_conf.src_addr_width =
DMA_SLAVE_BUSWIDTH_4_BYTES;
dd->dma_lch_in.dma_conf.dst_maxburst = 1;
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_tdes_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 +
TDES_ODATA1R;
dd->dma_lch_out.dma_conf.src_maxburst = 1;
dd->dma_lch_out.dma_conf.src_addr_width =
DMA_SLAVE_BUSWIDTH_4_BYTES;
dd->dma_lch_out.dma_conf.dst_maxburst = 1;
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 -ENODEV;
}
static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd)
{
dma_release_channel(dd->dma_lch_in.chan);
dma_release_channel(dd->dma_lch_out.chan);
}
static int atmel_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int keylen)
{
u32 tmp[DES_EXPKEY_WORDS];
int err;
struct crypto_tfm *ctfm = crypto_ablkcipher_tfm(tfm);
struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
if (keylen != DES_KEY_SIZE) {
crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
err = des_ekey(tmp, key);
if (err == 0 && (ctfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
ctfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}
memcpy(ctx->key, key, keylen);
ctx->keylen = keylen;
return 0;
}
static int atmel_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
const char *alg_name;
alg_name = crypto_tfm_alg_name(crypto_ablkcipher_tfm(tfm));
/*
* HW bug in cfb 3-keys mode.
*/
if (!ctx->dd->caps.has_cfb_3keys && strstr(alg_name, "cfb")
&& (keylen != 2*DES_KEY_SIZE)) {
crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
} else if ((keylen != 2*DES_KEY_SIZE) && (keylen != 3*DES_KEY_SIZE)) {
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_tdes_ecb_encrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT);
}
static int atmel_tdes_ecb_decrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, 0);
}
static int atmel_tdes_cbc_encrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CBC);
}
static int atmel_tdes_cbc_decrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CBC);
}
static int atmel_tdes_cfb_encrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB);
}
static int atmel_tdes_cfb_decrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CFB);
}
static int atmel_tdes_cfb8_encrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
TDES_FLAGS_CFB8);
}
static int atmel_tdes_cfb8_decrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB8);
}
static int atmel_tdes_cfb16_encrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
TDES_FLAGS_CFB16);
}
static int atmel_tdes_cfb16_decrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB16);
}
static int atmel_tdes_cfb32_encrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
TDES_FLAGS_CFB32);
}
static int atmel_tdes_cfb32_decrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB32);
}
static int atmel_tdes_ofb_encrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_OFB);
}
static int atmel_tdes_ofb_decrypt(struct ablkcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_OFB);
}
static int atmel_tdes_cra_init(struct crypto_tfm *tfm)
{
struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
struct atmel_tdes_dev *dd;
tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_tdes_reqctx);
dd = atmel_tdes_find_dev(ctx);
if (!dd)
return -ENODEV;
return 0;
}
static struct crypto_alg tdes_algs[] = {
{
.cra_name = "ecb(des)",
.cra_driver_name = "atmel-ecb-des",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x7,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_ecb_encrypt,
.decrypt = atmel_tdes_ecb_decrypt,
}
},
{
.cra_name = "cbc(des)",
.cra_driver_name = "atmel-cbc-des",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x7,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_cbc_encrypt,
.decrypt = atmel_tdes_cbc_decrypt,
}
},
{
.cra_name = "cfb(des)",
.cra_driver_name = "atmel-cfb-des",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x7,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_cfb_encrypt,
.decrypt = atmel_tdes_cfb_decrypt,
}
},
{
.cra_name = "cfb8(des)",
.cra_driver_name = "atmel-cfb8-des",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = CFB8_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_cfb8_encrypt,
.decrypt = atmel_tdes_cfb8_decrypt,
}
},
{
.cra_name = "cfb16(des)",
.cra_driver_name = "atmel-cfb16-des",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = CFB16_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x1,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_cfb16_encrypt,
.decrypt = atmel_tdes_cfb16_decrypt,
}
},
{
.cra_name = "cfb32(des)",
.cra_driver_name = "atmel-cfb32-des",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = CFB32_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x3,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_cfb32_encrypt,
.decrypt = atmel_tdes_cfb32_decrypt,
}
},
{
.cra_name = "ofb(des)",
.cra_driver_name = "atmel-ofb-des",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x7,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_ofb_encrypt,
.decrypt = atmel_tdes_ofb_decrypt,
}
},
{
.cra_name = "ecb(des3_ede)",
.cra_driver_name = "atmel-ecb-tdes",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x7,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2 * DES_KEY_SIZE,
.max_keysize = 3 * DES_KEY_SIZE,
.setkey = atmel_tdes_setkey,
.encrypt = atmel_tdes_ecb_encrypt,
.decrypt = atmel_tdes_ecb_decrypt,
}
},
{
.cra_name = "cbc(des3_ede)",
.cra_driver_name = "atmel-cbc-tdes",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x7,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2*DES_KEY_SIZE,
.max_keysize = 3*DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_tdes_setkey,
.encrypt = atmel_tdes_cbc_encrypt,
.decrypt = atmel_tdes_cbc_decrypt,
}
},
{
.cra_name = "cfb(des3_ede)",
.cra_driver_name = "atmel-cfb-tdes",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x7,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2*DES_KEY_SIZE,
.max_keysize = 2*DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_tdes_setkey,
.encrypt = atmel_tdes_cfb_encrypt,
.decrypt = atmel_tdes_cfb_decrypt,
}
},
{
.cra_name = "cfb8(des3_ede)",
.cra_driver_name = "atmel-cfb8-tdes",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = CFB8_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2*DES_KEY_SIZE,
.max_keysize = 2*DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_tdes_setkey,
.encrypt = atmel_tdes_cfb8_encrypt,
.decrypt = atmel_tdes_cfb8_decrypt,
}
},
{
.cra_name = "cfb16(des3_ede)",
.cra_driver_name = "atmel-cfb16-tdes",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = CFB16_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x1,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2*DES_KEY_SIZE,
.max_keysize = 2*DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_tdes_setkey,
.encrypt = atmel_tdes_cfb16_encrypt,
.decrypt = atmel_tdes_cfb16_decrypt,
}
},
{
.cra_name = "cfb32(des3_ede)",
.cra_driver_name = "atmel-cfb32-tdes",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = CFB32_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x3,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2*DES_KEY_SIZE,
.max_keysize = 2*DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_tdes_setkey,
.encrypt = atmel_tdes_cfb32_encrypt,
.decrypt = atmel_tdes_cfb32_decrypt,
}
},
{
.cra_name = "ofb(des3_ede)",
.cra_driver_name = "atmel-ofb-tdes",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x7,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2*DES_KEY_SIZE,
.max_keysize = 3*DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_tdes_setkey,
.encrypt = atmel_tdes_ofb_encrypt,
.decrypt = atmel_tdes_ofb_decrypt,
}
},
};
static void atmel_tdes_queue_task(unsigned long data)
{
struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *)data;
atmel_tdes_handle_queue(dd, NULL);
}
static void atmel_tdes_done_task(unsigned long data)
{
struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *) data;
int err;
if (!(dd->flags & TDES_FLAGS_DMA))
err = atmel_tdes_crypt_pdc_stop(dd);
else
err = atmel_tdes_crypt_dma_stop(dd);
err = dd->err ? : err;
if (dd->total && !err) {
if (dd->flags & TDES_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_tdes_crypt_start(dd);
if (!err)
return; /* DMA started. Not fininishing. */
}
atmel_tdes_finish_req(dd, err);
atmel_tdes_handle_queue(dd, NULL);
}
static irqreturn_t atmel_tdes_irq(int irq, void *dev_id)
{
struct atmel_tdes_dev *tdes_dd = dev_id;
u32 reg;
reg = atmel_tdes_read(tdes_dd, TDES_ISR);
if (reg & atmel_tdes_read(tdes_dd, TDES_IMR)) {
atmel_tdes_write(tdes_dd, TDES_IDR, reg);
if (TDES_FLAGS_BUSY & tdes_dd->flags)
tasklet_schedule(&tdes_dd->done_task);
else
dev_warn(tdes_dd->dev, "TDES interrupt when no active requests.\n");
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static void atmel_tdes_unregister_algs(struct atmel_tdes_dev *dd)
{
int i;
for (i = 0; i < ARRAY_SIZE(tdes_algs); i++)
crypto_unregister_alg(&tdes_algs[i]);
}
static int atmel_tdes_register_algs(struct atmel_tdes_dev *dd)
{
int err, i, j;
for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) {
err = crypto_register_alg(&tdes_algs[i]);
if (err)
goto err_tdes_algs;
}
return 0;
err_tdes_algs:
for (j = 0; j < i; j++)
crypto_unregister_alg(&tdes_algs[j]);
return err;
}
static void atmel_tdes_get_cap(struct atmel_tdes_dev *dd)
{
dd->caps.has_dma = 0;
dd->caps.has_cfb_3keys = 0;
/* keep only major version number */
switch (dd->hw_version & 0xf00) {
case 0x700:
dd->caps.has_dma = 1;
dd->caps.has_cfb_3keys = 1;
break;
case 0x600:
break;
default:
dev_warn(dd->dev,
"Unmanaged tdes version, set minimum capabilities\n");
break;
}
}
#if defined(CONFIG_OF)
static const struct of_device_id atmel_tdes_dt_ids[] = {
{ .compatible = "atmel,at91sam9g46-tdes" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, atmel_tdes_dt_ids);
static struct crypto_platform_data *atmel_tdes_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)
return ERR_PTR(-ENOMEM);
pdata->dma_slave = devm_kzalloc(&pdev->dev,
sizeof(*(pdata->dma_slave)),
GFP_KERNEL);
if (!pdata->dma_slave)
return ERR_PTR(-ENOMEM);
return pdata;
}
#else /* CONFIG_OF */
static inline struct crypto_platform_data *atmel_tdes_of_init(struct platform_device *pdev)
{
return ERR_PTR(-EINVAL);
}
#endif
static int atmel_tdes_probe(struct platform_device *pdev)
{
struct atmel_tdes_dev *tdes_dd;
struct crypto_platform_data *pdata;
struct device *dev = &pdev->dev;
struct resource *tdes_res;
int err;
tdes_dd = devm_kmalloc(&pdev->dev, sizeof(*tdes_dd), GFP_KERNEL);
if (tdes_dd == NULL) {
err = -ENOMEM;
goto tdes_dd_err;
}
tdes_dd->dev = dev;
platform_set_drvdata(pdev, tdes_dd);
INIT_LIST_HEAD(&tdes_dd->list);
spin_lock_init(&tdes_dd->lock);
tasklet_init(&tdes_dd->done_task, atmel_tdes_done_task,
(unsigned long)tdes_dd);
tasklet_init(&tdes_dd->queue_task, atmel_tdes_queue_task,
(unsigned long)tdes_dd);
crypto_init_queue(&tdes_dd->queue, ATMEL_TDES_QUEUE_LENGTH);
/* Get the base address */
tdes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!tdes_res) {
dev_err(dev, "no MEM resource info\n");
err = -ENODEV;
goto res_err;
}
tdes_dd->phys_base = tdes_res->start;
/* Get the IRQ */
tdes_dd->irq = platform_get_irq(pdev, 0);
if (tdes_dd->irq < 0) {
dev_err(dev, "no IRQ resource info\n");
err = tdes_dd->irq;
goto res_err;
}
err = devm_request_irq(&pdev->dev, tdes_dd->irq, atmel_tdes_irq,
IRQF_SHARED, "atmel-tdes", tdes_dd);
if (err) {
dev_err(dev, "unable to request tdes irq.\n");
goto res_err;
}
/* Initializing the clock */
tdes_dd->iclk = devm_clk_get(&pdev->dev, "tdes_clk");
if (IS_ERR(tdes_dd->iclk)) {
dev_err(dev, "clock initialization failed.\n");
err = PTR_ERR(tdes_dd->iclk);
goto res_err;
}
tdes_dd->io_base = devm_ioremap_resource(&pdev->dev, tdes_res);
if (IS_ERR(tdes_dd->io_base)) {
dev_err(dev, "can't ioremap\n");
err = PTR_ERR(tdes_dd->io_base);
goto res_err;
}
atmel_tdes_hw_version_init(tdes_dd);
atmel_tdes_get_cap(tdes_dd);
err = atmel_tdes_buff_init(tdes_dd);
if (err)
goto err_tdes_buff;
if (tdes_dd->caps.has_dma) {
pdata = pdev->dev.platform_data;
if (!pdata) {
pdata = atmel_tdes_of_init(pdev);
if (IS_ERR(pdata)) {
dev_err(&pdev->dev, "platform data not available\n");
err = PTR_ERR(pdata);
goto err_pdata;
}
}
if (!pdata->dma_slave) {
err = -ENXIO;
goto err_pdata;
}
err = atmel_tdes_dma_init(tdes_dd, pdata);
if (err)
goto err_tdes_dma;
dev_info(dev, "using %s, %s for DMA transfers\n",
dma_chan_name(tdes_dd->dma_lch_in.chan),
dma_chan_name(tdes_dd->dma_lch_out.chan));
}
spin_lock(&atmel_tdes.lock);
list_add_tail(&tdes_dd->list, &atmel_tdes.dev_list);
spin_unlock(&atmel_tdes.lock);
err = atmel_tdes_register_algs(tdes_dd);
if (err)
goto err_algs;
dev_info(dev, "Atmel DES/TDES\n");
return 0;
err_algs:
spin_lock(&atmel_tdes.lock);
list_del(&tdes_dd->list);
spin_unlock(&atmel_tdes.lock);
if (tdes_dd->caps.has_dma)
atmel_tdes_dma_cleanup(tdes_dd);
err_tdes_dma:
err_pdata:
atmel_tdes_buff_cleanup(tdes_dd);
err_tdes_buff:
res_err:
tasklet_kill(&tdes_dd->done_task);
tasklet_kill(&tdes_dd->queue_task);
tdes_dd_err:
dev_err(dev, "initialization failed.\n");
return err;
}
static int atmel_tdes_remove(struct platform_device *pdev)
{
struct atmel_tdes_dev *tdes_dd;
tdes_dd = platform_get_drvdata(pdev);
if (!tdes_dd)
return -ENODEV;
spin_lock(&atmel_tdes.lock);
list_del(&tdes_dd->list);
spin_unlock(&atmel_tdes.lock);
atmel_tdes_unregister_algs(tdes_dd);
tasklet_kill(&tdes_dd->done_task);
tasklet_kill(&tdes_dd->queue_task);
if (tdes_dd->caps.has_dma)
atmel_tdes_dma_cleanup(tdes_dd);
atmel_tdes_buff_cleanup(tdes_dd);
return 0;
}
static struct platform_driver atmel_tdes_driver = {
.probe = atmel_tdes_probe,
.remove = atmel_tdes_remove,
.driver = {
.name = "atmel_tdes",
.of_match_table = of_match_ptr(atmel_tdes_dt_ids),
},
};
module_platform_driver(atmel_tdes_driver);
MODULE_DESCRIPTION("Atmel DES/TDES hw acceleration support.");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
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