linux/drivers/crypto/omap-aes.c
Eric Biggers c79b411eaa crypto: skcipher - remove remnants of internal IV generators
Remove dead code related to internal IV generators, which are no longer
used since they've been replaced with the "seqiv" and "echainiv"
templates.  The removed code includes:

- The "givcipher" (GIVCIPHER) algorithm type.  No algorithms are
  registered with this type anymore, so it's unneeded.

- The "const char *geniv" member of aead_alg, ablkcipher_alg, and
  blkcipher_alg.  A few algorithms still set this, but it isn't used
  anymore except to show via /proc/crypto and CRYPTO_MSG_GETALG.
  Just hardcode "<default>" or "<none>" in those cases.

- The 'skcipher_givcrypt_request' structure, which is never used.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-12-23 11:52:45 +08:00

1348 lines
31 KiB
C

/*
* Cryptographic API.
*
* Support for OMAP AES HW acceleration.
*
* Copyright (c) 2010 Nokia Corporation
* Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
* Copyright (c) 2011 Texas Instruments Incorporated
*
* 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.
*
*/
#define pr_fmt(fmt) "%20s: " fmt, __func__
#define prn(num) pr_debug(#num "=%d\n", num)
#define prx(num) pr_debug(#num "=%x\n", num)
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/io.h>
#include <linux/crypto.h>
#include <linux/interrupt.h>
#include <crypto/scatterwalk.h>
#include <crypto/aes.h>
#include <crypto/gcm.h>
#include <crypto/engine.h>
#include <crypto/internal/skcipher.h>
#include <crypto/internal/aead.h>
#include "omap-crypto.h"
#include "omap-aes.h"
/* keep registered devices data here */
static LIST_HEAD(dev_list);
static DEFINE_SPINLOCK(list_lock);
static int aes_fallback_sz = 200;
#ifdef DEBUG
#define omap_aes_read(dd, offset) \
({ \
int _read_ret; \
_read_ret = __raw_readl(dd->io_base + offset); \
pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n", \
offset, _read_ret); \
_read_ret; \
})
#else
inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
{
return __raw_readl(dd->io_base + offset);
}
#endif
#ifdef DEBUG
#define omap_aes_write(dd, offset, value) \
do { \
pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \
offset, value); \
__raw_writel(value, dd->io_base + offset); \
} while (0)
#else
inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
u32 value)
{
__raw_writel(value, dd->io_base + offset);
}
#endif
static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
u32 value, u32 mask)
{
u32 val;
val = omap_aes_read(dd, offset);
val &= ~mask;
val |= value;
omap_aes_write(dd, offset, val);
}
static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
u32 *value, int count)
{
for (; count--; value++, offset += 4)
omap_aes_write(dd, offset, *value);
}
static int omap_aes_hw_init(struct omap_aes_dev *dd)
{
int err;
if (!(dd->flags & FLAGS_INIT)) {
dd->flags |= FLAGS_INIT;
dd->err = 0;
}
err = pm_runtime_get_sync(dd->dev);
if (err < 0) {
dev_err(dd->dev, "failed to get sync: %d\n", err);
return err;
}
return 0;
}
void omap_aes_clear_copy_flags(struct omap_aes_dev *dd)
{
dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_IN_DATA_ST_SHIFT);
dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_OUT_DATA_ST_SHIFT);
dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_ASSOC_DATA_ST_SHIFT);
}
int omap_aes_write_ctrl(struct omap_aes_dev *dd)
{
struct omap_aes_reqctx *rctx;
unsigned int key32;
int i, err;
u32 val;
err = omap_aes_hw_init(dd);
if (err)
return err;
key32 = dd->ctx->keylen / sizeof(u32);
/* RESET the key as previous HASH keys should not get affected*/
if (dd->flags & FLAGS_GCM)
for (i = 0; i < 0x40; i = i + 4)
omap_aes_write(dd, i, 0x0);
for (i = 0; i < key32; i++) {
omap_aes_write(dd, AES_REG_KEY(dd, i),
__le32_to_cpu(dd->ctx->key[i]));
}
if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->info)
omap_aes_write_n(dd, AES_REG_IV(dd, 0), dd->req->info, 4);
if ((dd->flags & (FLAGS_GCM)) && dd->aead_req->iv) {
rctx = aead_request_ctx(dd->aead_req);
omap_aes_write_n(dd, AES_REG_IV(dd, 0), (u32 *)rctx->iv, 4);
}
val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
if (dd->flags & FLAGS_CBC)
val |= AES_REG_CTRL_CBC;
if (dd->flags & (FLAGS_CTR | FLAGS_GCM))
val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128;
if (dd->flags & FLAGS_GCM)
val |= AES_REG_CTRL_GCM;
if (dd->flags & FLAGS_ENCRYPT)
val |= AES_REG_CTRL_DIRECTION;
omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, AES_REG_CTRL_MASK);
return 0;
}
static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length)
{
u32 mask, val;
val = dd->pdata->dma_start;
if (dd->dma_lch_out != NULL)
val |= dd->pdata->dma_enable_out;
if (dd->dma_lch_in != NULL)
val |= dd->pdata->dma_enable_in;
mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
dd->pdata->dma_start;
omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask);
}
static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length)
{
omap_aes_write(dd, AES_REG_LENGTH_N(0), length);
omap_aes_write(dd, AES_REG_LENGTH_N(1), 0);
if (dd->flags & FLAGS_GCM)
omap_aes_write(dd, AES_REG_A_LEN, dd->assoc_len);
omap_aes_dma_trigger_omap2(dd, length);
}
static void omap_aes_dma_stop(struct omap_aes_dev *dd)
{
u32 mask;
mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
dd->pdata->dma_start;
omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask);
}
struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_reqctx *rctx)
{
struct omap_aes_dev *dd;
spin_lock_bh(&list_lock);
dd = list_first_entry(&dev_list, struct omap_aes_dev, list);
list_move_tail(&dd->list, &dev_list);
rctx->dd = dd;
spin_unlock_bh(&list_lock);
return dd;
}
static void omap_aes_dma_out_callback(void *data)
{
struct omap_aes_dev *dd = data;
/* dma_lch_out - completed */
tasklet_schedule(&dd->done_task);
}
static int omap_aes_dma_init(struct omap_aes_dev *dd)
{
int err;
dd->dma_lch_out = NULL;
dd->dma_lch_in = NULL;
dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
if (IS_ERR(dd->dma_lch_in)) {
dev_err(dd->dev, "Unable to request in DMA channel\n");
return PTR_ERR(dd->dma_lch_in);
}
dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
if (IS_ERR(dd->dma_lch_out)) {
dev_err(dd->dev, "Unable to request out DMA channel\n");
err = PTR_ERR(dd->dma_lch_out);
goto err_dma_out;
}
return 0;
err_dma_out:
dma_release_channel(dd->dma_lch_in);
return err;
}
static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
{
if (dd->pio_only)
return;
dma_release_channel(dd->dma_lch_out);
dma_release_channel(dd->dma_lch_in);
}
static int omap_aes_crypt_dma(struct omap_aes_dev *dd,
struct scatterlist *in_sg,
struct scatterlist *out_sg,
int in_sg_len, int out_sg_len)
{
struct dma_async_tx_descriptor *tx_in, *tx_out;
struct dma_slave_config cfg;
int ret;
if (dd->pio_only) {
scatterwalk_start(&dd->in_walk, dd->in_sg);
scatterwalk_start(&dd->out_walk, dd->out_sg);
/* Enable DATAIN interrupt and let it take
care of the rest */
omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
return 0;
}
dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
memset(&cfg, 0, sizeof(cfg));
cfg.src_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
cfg.dst_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
cfg.src_maxburst = DST_MAXBURST;
cfg.dst_maxburst = DST_MAXBURST;
/* IN */
ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
if (ret) {
dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
ret);
return ret;
}
tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!tx_in) {
dev_err(dd->dev, "IN prep_slave_sg() failed\n");
return -EINVAL;
}
/* No callback necessary */
tx_in->callback_param = dd;
/* OUT */
ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
if (ret) {
dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
ret);
return ret;
}
tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!tx_out) {
dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
return -EINVAL;
}
if (dd->flags & FLAGS_GCM)
tx_out->callback = omap_aes_gcm_dma_out_callback;
else
tx_out->callback = omap_aes_dma_out_callback;
tx_out->callback_param = dd;
dmaengine_submit(tx_in);
dmaengine_submit(tx_out);
dma_async_issue_pending(dd->dma_lch_in);
dma_async_issue_pending(dd->dma_lch_out);
/* start DMA */
dd->pdata->trigger(dd, dd->total);
return 0;
}
int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
{
int err;
pr_debug("total: %d\n", dd->total);
if (!dd->pio_only) {
err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
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, dd->out_sg_len,
DMA_FROM_DEVICE);
if (!err) {
dev_err(dd->dev, "dma_map_sg() error\n");
return -EINVAL;
}
}
err = omap_aes_crypt_dma(dd, dd->in_sg, dd->out_sg, dd->in_sg_len,
dd->out_sg_len);
if (err && !dd->pio_only) {
dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
DMA_FROM_DEVICE);
}
return err;
}
static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
{
struct ablkcipher_request *req = dd->req;
pr_debug("err: %d\n", err);
crypto_finalize_ablkcipher_request(dd->engine, req, err);
pm_runtime_mark_last_busy(dd->dev);
pm_runtime_put_autosuspend(dd->dev);
}
int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
{
pr_debug("total: %d\n", dd->total);
omap_aes_dma_stop(dd);
return 0;
}
static int omap_aes_handle_queue(struct omap_aes_dev *dd,
struct ablkcipher_request *req)
{
if (req)
return crypto_transfer_ablkcipher_request_to_engine(dd->engine, req);
return 0;
}
static int omap_aes_prepare_req(struct crypto_engine *engine,
void *areq)
{
struct ablkcipher_request *req = container_of(areq, struct ablkcipher_request, base);
struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
crypto_ablkcipher_reqtfm(req));
struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
struct omap_aes_dev *dd = rctx->dd;
int ret;
u16 flags;
if (!dd)
return -ENODEV;
/* assign new request to device */
dd->req = req;
dd->total = req->nbytes;
dd->total_save = req->nbytes;
dd->in_sg = req->src;
dd->out_sg = req->dst;
dd->orig_out = req->dst;
flags = OMAP_CRYPTO_COPY_DATA;
if (req->src == req->dst)
flags |= OMAP_CRYPTO_FORCE_COPY;
ret = omap_crypto_align_sg(&dd->in_sg, dd->total, AES_BLOCK_SIZE,
dd->in_sgl, flags,
FLAGS_IN_DATA_ST_SHIFT, &dd->flags);
if (ret)
return ret;
ret = omap_crypto_align_sg(&dd->out_sg, dd->total, AES_BLOCK_SIZE,
&dd->out_sgl, 0,
FLAGS_OUT_DATA_ST_SHIFT, &dd->flags);
if (ret)
return ret;
dd->in_sg_len = sg_nents_for_len(dd->in_sg, dd->total);
if (dd->in_sg_len < 0)
return dd->in_sg_len;
dd->out_sg_len = sg_nents_for_len(dd->out_sg, dd->total);
if (dd->out_sg_len < 0)
return dd->out_sg_len;
rctx->mode &= FLAGS_MODE_MASK;
dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
dd->ctx = ctx;
rctx->dd = dd;
return omap_aes_write_ctrl(dd);
}
static int omap_aes_crypt_req(struct crypto_engine *engine,
void *areq)
{
struct ablkcipher_request *req = container_of(areq, struct ablkcipher_request, base);
struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
struct omap_aes_dev *dd = rctx->dd;
if (!dd)
return -ENODEV;
return omap_aes_crypt_dma_start(dd);
}
static void omap_aes_done_task(unsigned long data)
{
struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
pr_debug("enter done_task\n");
if (!dd->pio_only) {
dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
DMA_FROM_DEVICE);
dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
DMA_FROM_DEVICE);
omap_aes_crypt_dma_stop(dd);
}
omap_crypto_cleanup(dd->in_sgl, NULL, 0, dd->total_save,
FLAGS_IN_DATA_ST_SHIFT, dd->flags);
omap_crypto_cleanup(&dd->out_sgl, dd->orig_out, 0, dd->total_save,
FLAGS_OUT_DATA_ST_SHIFT, dd->flags);
omap_aes_finish_req(dd, 0);
pr_debug("exit\n");
}
static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
{
struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
crypto_ablkcipher_reqtfm(req));
struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
struct omap_aes_dev *dd;
int ret;
pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
!!(mode & FLAGS_ENCRYPT),
!!(mode & FLAGS_CBC));
if (req->nbytes < aes_fallback_sz) {
SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
skcipher_request_set_sync_tfm(subreq, ctx->fallback);
skcipher_request_set_callback(subreq, req->base.flags, NULL,
NULL);
skcipher_request_set_crypt(subreq, req->src, req->dst,
req->nbytes, req->info);
if (mode & FLAGS_ENCRYPT)
ret = crypto_skcipher_encrypt(subreq);
else
ret = crypto_skcipher_decrypt(subreq);
skcipher_request_zero(subreq);
return ret;
}
dd = omap_aes_find_dev(rctx);
if (!dd)
return -ENODEV;
rctx->mode = mode;
return omap_aes_handle_queue(dd, req);
}
/* ********************** ALG API ************************************ */
static int omap_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
int ret;
if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
keylen != AES_KEYSIZE_256)
return -EINVAL;
pr_debug("enter, keylen: %d\n", keylen);
memcpy(ctx->key, key, keylen);
ctx->keylen = keylen;
crypto_sync_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
crypto_sync_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
CRYPTO_TFM_REQ_MASK);
ret = crypto_sync_skcipher_setkey(ctx->fallback, key, keylen);
if (!ret)
return 0;
return 0;
}
static int omap_aes_ecb_encrypt(struct ablkcipher_request *req)
{
return omap_aes_crypt(req, FLAGS_ENCRYPT);
}
static int omap_aes_ecb_decrypt(struct ablkcipher_request *req)
{
return omap_aes_crypt(req, 0);
}
static int omap_aes_cbc_encrypt(struct ablkcipher_request *req)
{
return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
}
static int omap_aes_cbc_decrypt(struct ablkcipher_request *req)
{
return omap_aes_crypt(req, FLAGS_CBC);
}
static int omap_aes_ctr_encrypt(struct ablkcipher_request *req)
{
return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR);
}
static int omap_aes_ctr_decrypt(struct ablkcipher_request *req)
{
return omap_aes_crypt(req, FLAGS_CTR);
}
static int omap_aes_prepare_req(struct crypto_engine *engine,
void *req);
static int omap_aes_crypt_req(struct crypto_engine *engine,
void *req);
static int omap_aes_cra_init(struct crypto_tfm *tfm)
{
const char *name = crypto_tfm_alg_name(tfm);
struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
struct crypto_sync_skcipher *blk;
blk = crypto_alloc_sync_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(blk))
return PTR_ERR(blk);
ctx->fallback = blk;
tfm->crt_ablkcipher.reqsize = sizeof(struct omap_aes_reqctx);
ctx->enginectx.op.prepare_request = omap_aes_prepare_req;
ctx->enginectx.op.unprepare_request = NULL;
ctx->enginectx.op.do_one_request = omap_aes_crypt_req;
return 0;
}
static int omap_aes_gcm_cra_init(struct crypto_aead *tfm)
{
struct omap_aes_dev *dd = NULL;
struct omap_aes_ctx *ctx = crypto_aead_ctx(tfm);
int err;
/* Find AES device, currently picks the first device */
spin_lock_bh(&list_lock);
list_for_each_entry(dd, &dev_list, list) {
break;
}
spin_unlock_bh(&list_lock);
err = pm_runtime_get_sync(dd->dev);
if (err < 0) {
dev_err(dd->dev, "%s: failed to get_sync(%d)\n",
__func__, err);
return err;
}
tfm->reqsize = sizeof(struct omap_aes_reqctx);
ctx->ctr = crypto_alloc_skcipher("ecb(aes)", 0, 0);
if (IS_ERR(ctx->ctr)) {
pr_warn("could not load aes driver for encrypting IV\n");
return PTR_ERR(ctx->ctr);
}
return 0;
}
static void omap_aes_cra_exit(struct crypto_tfm *tfm)
{
struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
if (ctx->fallback)
crypto_free_sync_skcipher(ctx->fallback);
ctx->fallback = NULL;
}
static void omap_aes_gcm_cra_exit(struct crypto_aead *tfm)
{
struct omap_aes_ctx *ctx = crypto_aead_ctx(tfm);
omap_aes_cra_exit(crypto_aead_tfm(tfm));
if (ctx->ctr)
crypto_free_skcipher(ctx->ctr);
}
/* ********************** ALGS ************************************ */
static struct crypto_alg algs_ecb_cbc[] = {
{
.cra_name = "ecb(aes)",
.cra_driver_name = "ecb-aes-omap",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_KERN_DRIVER_ONLY |
CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_aes_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = omap_aes_cra_init,
.cra_exit = omap_aes_cra_exit,
.cra_u.ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.setkey = omap_aes_setkey,
.encrypt = omap_aes_ecb_encrypt,
.decrypt = omap_aes_ecb_decrypt,
}
},
{
.cra_name = "cbc(aes)",
.cra_driver_name = "cbc-aes-omap",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_KERN_DRIVER_ONLY |
CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_aes_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = omap_aes_cra_init,
.cra_exit = omap_aes_cra_exit,
.cra_u.ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = omap_aes_setkey,
.encrypt = omap_aes_cbc_encrypt,
.decrypt = omap_aes_cbc_decrypt,
}
}
};
static struct crypto_alg algs_ctr[] = {
{
.cra_name = "ctr(aes)",
.cra_driver_name = "ctr-aes-omap",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_KERN_DRIVER_ONLY |
CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_aes_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = omap_aes_cra_init,
.cra_exit = omap_aes_cra_exit,
.cra_u.ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = omap_aes_setkey,
.encrypt = omap_aes_ctr_encrypt,
.decrypt = omap_aes_ctr_decrypt,
}
} ,
};
static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
{
.algs_list = algs_ecb_cbc,
.size = ARRAY_SIZE(algs_ecb_cbc),
},
};
static struct aead_alg algs_aead_gcm[] = {
{
.base = {
.cra_name = "gcm(aes)",
.cra_driver_name = "gcm-aes-omap",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_ASYNC |
CRYPTO_ALG_KERN_DRIVER_ONLY,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct omap_aes_ctx),
.cra_alignmask = 0xf,
.cra_module = THIS_MODULE,
},
.init = omap_aes_gcm_cra_init,
.exit = omap_aes_gcm_cra_exit,
.ivsize = GCM_AES_IV_SIZE,
.maxauthsize = AES_BLOCK_SIZE,
.setkey = omap_aes_gcm_setkey,
.encrypt = omap_aes_gcm_encrypt,
.decrypt = omap_aes_gcm_decrypt,
},
{
.base = {
.cra_name = "rfc4106(gcm(aes))",
.cra_driver_name = "rfc4106-gcm-aes-omap",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_ASYNC |
CRYPTO_ALG_KERN_DRIVER_ONLY,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct omap_aes_ctx),
.cra_alignmask = 0xf,
.cra_module = THIS_MODULE,
},
.init = omap_aes_gcm_cra_init,
.exit = omap_aes_gcm_cra_exit,
.maxauthsize = AES_BLOCK_SIZE,
.ivsize = GCM_RFC4106_IV_SIZE,
.setkey = omap_aes_4106gcm_setkey,
.encrypt = omap_aes_4106gcm_encrypt,
.decrypt = omap_aes_4106gcm_decrypt,
},
};
static struct omap_aes_aead_algs omap_aes_aead_info = {
.algs_list = algs_aead_gcm,
.size = ARRAY_SIZE(algs_aead_gcm),
};
static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
.algs_info = omap_aes_algs_info_ecb_cbc,
.algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc),
.trigger = omap_aes_dma_trigger_omap2,
.key_ofs = 0x1c,
.iv_ofs = 0x20,
.ctrl_ofs = 0x30,
.data_ofs = 0x34,
.rev_ofs = 0x44,
.mask_ofs = 0x48,
.dma_enable_in = BIT(2),
.dma_enable_out = BIT(3),
.dma_start = BIT(5),
.major_mask = 0xf0,
.major_shift = 4,
.minor_mask = 0x0f,
.minor_shift = 0,
};
#ifdef CONFIG_OF
static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = {
{
.algs_list = algs_ecb_cbc,
.size = ARRAY_SIZE(algs_ecb_cbc),
},
{
.algs_list = algs_ctr,
.size = ARRAY_SIZE(algs_ctr),
},
};
static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
.algs_info = omap_aes_algs_info_ecb_cbc_ctr,
.algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
.trigger = omap_aes_dma_trigger_omap2,
.key_ofs = 0x1c,
.iv_ofs = 0x20,
.ctrl_ofs = 0x30,
.data_ofs = 0x34,
.rev_ofs = 0x44,
.mask_ofs = 0x48,
.dma_enable_in = BIT(2),
.dma_enable_out = BIT(3),
.dma_start = BIT(5),
.major_mask = 0xf0,
.major_shift = 4,
.minor_mask = 0x0f,
.minor_shift = 0,
};
static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
.algs_info = omap_aes_algs_info_ecb_cbc_ctr,
.algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
.aead_algs_info = &omap_aes_aead_info,
.trigger = omap_aes_dma_trigger_omap4,
.key_ofs = 0x3c,
.iv_ofs = 0x40,
.ctrl_ofs = 0x50,
.data_ofs = 0x60,
.rev_ofs = 0x80,
.mask_ofs = 0x84,
.irq_status_ofs = 0x8c,
.irq_enable_ofs = 0x90,
.dma_enable_in = BIT(5),
.dma_enable_out = BIT(6),
.major_mask = 0x0700,
.major_shift = 8,
.minor_mask = 0x003f,
.minor_shift = 0,
};
static irqreturn_t omap_aes_irq(int irq, void *dev_id)
{
struct omap_aes_dev *dd = dev_id;
u32 status, i;
u32 *src, *dst;
status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
if (status & AES_REG_IRQ_DATA_IN) {
omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
BUG_ON(!dd->in_sg);
BUG_ON(_calc_walked(in) > dd->in_sg->length);
src = sg_virt(dd->in_sg) + _calc_walked(in);
for (i = 0; i < AES_BLOCK_WORDS; i++) {
omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
scatterwalk_advance(&dd->in_walk, 4);
if (dd->in_sg->length == _calc_walked(in)) {
dd->in_sg = sg_next(dd->in_sg);
if (dd->in_sg) {
scatterwalk_start(&dd->in_walk,
dd->in_sg);
src = sg_virt(dd->in_sg) +
_calc_walked(in);
}
} else {
src++;
}
}
/* Clear IRQ status */
status &= ~AES_REG_IRQ_DATA_IN;
omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
/* Enable DATA_OUT interrupt */
omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
} else if (status & AES_REG_IRQ_DATA_OUT) {
omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
BUG_ON(!dd->out_sg);
BUG_ON(_calc_walked(out) > dd->out_sg->length);
dst = sg_virt(dd->out_sg) + _calc_walked(out);
for (i = 0; i < AES_BLOCK_WORDS; i++) {
*dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
scatterwalk_advance(&dd->out_walk, 4);
if (dd->out_sg->length == _calc_walked(out)) {
dd->out_sg = sg_next(dd->out_sg);
if (dd->out_sg) {
scatterwalk_start(&dd->out_walk,
dd->out_sg);
dst = sg_virt(dd->out_sg) +
_calc_walked(out);
}
} else {
dst++;
}
}
dd->total -= min_t(size_t, AES_BLOCK_SIZE, dd->total);
/* Clear IRQ status */
status &= ~AES_REG_IRQ_DATA_OUT;
omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
if (!dd->total)
/* All bytes read! */
tasklet_schedule(&dd->done_task);
else
/* Enable DATA_IN interrupt for next block */
omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
}
return IRQ_HANDLED;
}
static const struct of_device_id omap_aes_of_match[] = {
{
.compatible = "ti,omap2-aes",
.data = &omap_aes_pdata_omap2,
},
{
.compatible = "ti,omap3-aes",
.data = &omap_aes_pdata_omap3,
},
{
.compatible = "ti,omap4-aes",
.data = &omap_aes_pdata_omap4,
},
{},
};
MODULE_DEVICE_TABLE(of, omap_aes_of_match);
static int omap_aes_get_res_of(struct omap_aes_dev *dd,
struct device *dev, struct resource *res)
{
struct device_node *node = dev->of_node;
int err = 0;
dd->pdata = of_device_get_match_data(dev);
if (!dd->pdata) {
dev_err(dev, "no compatible OF match\n");
err = -EINVAL;
goto err;
}
err = of_address_to_resource(node, 0, res);
if (err < 0) {
dev_err(dev, "can't translate OF node address\n");
err = -EINVAL;
goto err;
}
err:
return err;
}
#else
static const struct of_device_id omap_aes_of_match[] = {
{},
};
static int omap_aes_get_res_of(struct omap_aes_dev *dd,
struct device *dev, struct resource *res)
{
return -EINVAL;
}
#endif
static int omap_aes_get_res_pdev(struct omap_aes_dev *dd,
struct platform_device *pdev, struct resource *res)
{
struct device *dev = &pdev->dev;
struct resource *r;
int err = 0;
/* Get the base address */
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
dev_err(dev, "no MEM resource info\n");
err = -ENODEV;
goto err;
}
memcpy(res, r, sizeof(*res));
/* Only OMAP2/3 can be non-DT */
dd->pdata = &omap_aes_pdata_omap2;
err:
return err;
}
static ssize_t fallback_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", aes_fallback_sz);
}
static ssize_t fallback_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t size)
{
ssize_t status;
long value;
status = kstrtol(buf, 0, &value);
if (status)
return status;
/* HW accelerator only works with buffers > 9 */
if (value < 9) {
dev_err(dev, "minimum fallback size 9\n");
return -EINVAL;
}
aes_fallback_sz = value;
return size;
}
static ssize_t queue_len_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct omap_aes_dev *dd = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", dd->engine->queue.max_qlen);
}
static ssize_t queue_len_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t size)
{
struct omap_aes_dev *dd;
ssize_t status;
long value;
unsigned long flags;
status = kstrtol(buf, 0, &value);
if (status)
return status;
if (value < 1)
return -EINVAL;
/*
* Changing the queue size in fly is safe, if size becomes smaller
* than current size, it will just not accept new entries until
* it has shrank enough.
*/
spin_lock_bh(&list_lock);
list_for_each_entry(dd, &dev_list, list) {
spin_lock_irqsave(&dd->lock, flags);
dd->engine->queue.max_qlen = value;
dd->aead_queue.base.max_qlen = value;
spin_unlock_irqrestore(&dd->lock, flags);
}
spin_unlock_bh(&list_lock);
return size;
}
static DEVICE_ATTR_RW(queue_len);
static DEVICE_ATTR_RW(fallback);
static struct attribute *omap_aes_attrs[] = {
&dev_attr_queue_len.attr,
&dev_attr_fallback.attr,
NULL,
};
static struct attribute_group omap_aes_attr_group = {
.attrs = omap_aes_attrs,
};
static int omap_aes_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct omap_aes_dev *dd;
struct crypto_alg *algp;
struct aead_alg *aalg;
struct resource res;
int err = -ENOMEM, i, j, irq = -1;
u32 reg;
dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL);
if (dd == NULL) {
dev_err(dev, "unable to alloc data struct.\n");
goto err_data;
}
dd->dev = dev;
platform_set_drvdata(pdev, dd);
aead_init_queue(&dd->aead_queue, OMAP_AES_QUEUE_LENGTH);
err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) :
omap_aes_get_res_pdev(dd, pdev, &res);
if (err)
goto err_res;
dd->io_base = devm_ioremap_resource(dev, &res);
if (IS_ERR(dd->io_base)) {
err = PTR_ERR(dd->io_base);
goto err_res;
}
dd->phys_base = res.start;
pm_runtime_use_autosuspend(dev);
pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
pm_runtime_enable(dev);
err = pm_runtime_get_sync(dev);
if (err < 0) {
dev_err(dev, "%s: failed to get_sync(%d)\n",
__func__, err);
goto err_res;
}
omap_aes_dma_stop(dd);
reg = omap_aes_read(dd, AES_REG_REV(dd));
pm_runtime_put_sync(dev);
dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
(reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
(reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
err = omap_aes_dma_init(dd);
if (err == -EPROBE_DEFER) {
goto err_irq;
} else if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
dd->pio_only = 1;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(dev, "can't get IRQ resource\n");
err = irq;
goto err_irq;
}
err = devm_request_irq(dev, irq, omap_aes_irq, 0,
dev_name(dev), dd);
if (err) {
dev_err(dev, "Unable to grab omap-aes IRQ\n");
goto err_irq;
}
}
spin_lock_init(&dd->lock);
INIT_LIST_HEAD(&dd->list);
spin_lock(&list_lock);
list_add_tail(&dd->list, &dev_list);
spin_unlock(&list_lock);
/* Initialize crypto engine */
dd->engine = crypto_engine_alloc_init(dev, 1);
if (!dd->engine) {
err = -ENOMEM;
goto err_engine;
}
err = crypto_engine_start(dd->engine);
if (err)
goto err_engine;
for (i = 0; i < dd->pdata->algs_info_size; i++) {
if (!dd->pdata->algs_info[i].registered) {
for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
algp = &dd->pdata->algs_info[i].algs_list[j];
pr_debug("reg alg: %s\n", algp->cra_name);
err = crypto_register_alg(algp);
if (err)
goto err_algs;
dd->pdata->algs_info[i].registered++;
}
}
}
if (dd->pdata->aead_algs_info &&
!dd->pdata->aead_algs_info->registered) {
for (i = 0; i < dd->pdata->aead_algs_info->size; i++) {
aalg = &dd->pdata->aead_algs_info->algs_list[i];
algp = &aalg->base;
pr_debug("reg alg: %s\n", algp->cra_name);
err = crypto_register_aead(aalg);
if (err)
goto err_aead_algs;
dd->pdata->aead_algs_info->registered++;
}
}
err = sysfs_create_group(&dev->kobj, &omap_aes_attr_group);
if (err) {
dev_err(dev, "could not create sysfs device attrs\n");
goto err_aead_algs;
}
return 0;
err_aead_algs:
for (i = dd->pdata->aead_algs_info->registered - 1; i >= 0; i--) {
aalg = &dd->pdata->aead_algs_info->algs_list[i];
crypto_unregister_aead(aalg);
}
err_algs:
for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
crypto_unregister_alg(
&dd->pdata->algs_info[i].algs_list[j]);
err_engine:
if (dd->engine)
crypto_engine_exit(dd->engine);
omap_aes_dma_cleanup(dd);
err_irq:
tasklet_kill(&dd->done_task);
pm_runtime_disable(dev);
err_res:
dd = NULL;
err_data:
dev_err(dev, "initialization failed.\n");
return err;
}
static int omap_aes_remove(struct platform_device *pdev)
{
struct omap_aes_dev *dd = platform_get_drvdata(pdev);
struct aead_alg *aalg;
int i, j;
if (!dd)
return -ENODEV;
spin_lock(&list_lock);
list_del(&dd->list);
spin_unlock(&list_lock);
for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
crypto_unregister_alg(
&dd->pdata->algs_info[i].algs_list[j]);
for (i = dd->pdata->aead_algs_info->size - 1; i >= 0; i--) {
aalg = &dd->pdata->aead_algs_info->algs_list[i];
crypto_unregister_aead(aalg);
}
crypto_engine_exit(dd->engine);
tasklet_kill(&dd->done_task);
omap_aes_dma_cleanup(dd);
pm_runtime_disable(dd->dev);
dd = NULL;
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int omap_aes_suspend(struct device *dev)
{
pm_runtime_put_sync(dev);
return 0;
}
static int omap_aes_resume(struct device *dev)
{
pm_runtime_get_sync(dev);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(omap_aes_pm_ops, omap_aes_suspend, omap_aes_resume);
static struct platform_driver omap_aes_driver = {
.probe = omap_aes_probe,
.remove = omap_aes_remove,
.driver = {
.name = "omap-aes",
.pm = &omap_aes_pm_ops,
.of_match_table = omap_aes_of_match,
},
};
module_platform_driver(omap_aes_driver);
MODULE_DESCRIPTION("OMAP AES hw acceleration support.");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Dmitry Kasatkin");