OMAP AES hw supports AES-GCM mode.
Adding support for GCM mode in omap-aes driver.
Signed-off-by: Lokesh Vutla <lokeshvu...@ti.com>
---
drivers/crypto/Kconfig | 1 +
drivers/crypto/Makefile | 3 +-
drivers/crypto/omap-aes-gcm.c | 376 ++++++++++++++++++++++++++++++++++++++++++
drivers/crypto/omap-aes.c | 300 ++++++++++++++-------------------
drivers/crypto/omap-aes.h | 212 ++++++++++++++++++++++++
5 files changed, 718 insertions(+), 174 deletions(-)
create mode 100644 drivers/crypto/omap-aes-gcm.c
create mode 100644 drivers/crypto/omap-aes.h
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 4044125..6e67271 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -293,6 +293,7 @@ config CRYPTO_DEV_OMAP_AES
depends on ARCH_OMAP2 || ARCH_OMAP3 || ARCH_OMAP2PLUS
select CRYPTO_AES
select CRYPTO_BLKCIPHER
+ select CRYPTO_AEAD
help
OMAP processors have AES module accelerator. Select this if you
want to use the OMAP module for AES algorithms.
diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
index e35c07a..73115bd 100644
--- a/drivers/crypto/Makefile
+++ b/drivers/crypto/Makefile
@@ -14,7 +14,8 @@ obj-$(CONFIG_CRYPTO_DEV_MXS_DCP) += mxs-dcp.o
obj-$(CONFIG_CRYPTO_DEV_NIAGARA2) += n2_crypto.o
n2_crypto-y := n2_core.o n2_asm.o
obj-$(CONFIG_CRYPTO_DEV_NX) += nx/
-obj-$(CONFIG_CRYPTO_DEV_OMAP_AES) += omap-aes.o
+obj-$(CONFIG_CRYPTO_DEV_OMAP_AES) += omap-aes-driver.o
+omap-aes-driver-objs := omap-aes.o omap-aes-gcm.o
obj-$(CONFIG_CRYPTO_DEV_OMAP_DES) += omap-des.o
obj-$(CONFIG_CRYPTO_DEV_OMAP_SHAM) += omap-sham.o
obj-$(CONFIG_CRYPTO_DEV_PADLOCK_AES) += padlock-aes.o
diff --git a/drivers/crypto/omap-aes-gcm.c b/drivers/crypto/omap-aes-gcm.c
new file mode 100644
index 0000000..f0faa72
--- /dev/null
+++ b/drivers/crypto/omap-aes-gcm.c
@@ -0,0 +1,376 @@
+/*
+ * Cryptographic API.
+ *
+ * Support for OMAP AES GCM HW acceleration.
+ *
+ * Copyright (c) 2015 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.
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/omap-dma.h>
+#include <linux/interrupt.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/aes.h>
+#include <crypto/internal/aead.h>
+#include "omap-aes.h"
+
+static int omap_aes_gcm_handle_queue(struct omap_aes_dev *dd,
+ struct aead_request *req);
+
+static void omap_aes_gcm_finish_req(struct omap_aes_dev *dd, int ret)
+{
+ struct aead_request *req = dd->aead_req;
+
+ dd->flags &= ~FLAGS_BUSY;
+ dd->in_sg = NULL;
+ dd->out_sg = NULL;
+
+ req->base.complete(&req->base, ret);
+}
+
+static void omap_aes_gcm_done_task(struct omap_aes_dev *dd)
+{
+ void *buf;
+ u8 *tag;
+ int pages, alen, clen, i, ret = 0, nsg;
+
+ alen = ALIGN(dd->assoc_len, AES_BLOCK_SIZE);
+ clen = ALIGN(dd->total, AES_BLOCK_SIZE);
+
+ nsg = !!(dd->assoc_len && dd->total);
+
+ 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);
+
+ if (dd->sgs_copied & AES_OUT_DATA_COPIED) {
+ buf = sg_virt(&dd->out_sgl);
+ scatterwalk_map_and_copy(buf, dd->orig_out, dd->assoc_len,
+ dd->total, 1);
+
+ pages = get_order(clen);
+ free_pages((unsigned long)buf, pages);
+ }
+
+ if (dd->flags & FLAGS_ENCRYPT)
+ scatterwalk_map_and_copy(dd->ctx->auth_tag,
+ dd->aead_req->dst,
+ dd->total + dd->assoc_len,
+ dd->authsize, 1);
+
+ if (dd->sgs_copied & AES_ASSOC_DATA_COPIED) {
+ buf = sg_virt(&dd->in_sgl[0]);
+ pages = get_order(alen);
+ free_pages((unsigned long)buf, pages);
+ }
+ if (dd->sgs_copied & AES_IN_DATA_COPIED) {
+ buf = sg_virt(&dd->in_sgl[nsg]);
+ pages = get_order(clen);
+ free_pages((unsigned long)buf, pages);
+ }
+
+ if (!(dd->flags & FLAGS_ENCRYPT)) {
+ tag = (u8 *)dd->ctx->auth_tag;
+ for (i = 0; i < dd->authsize; i++) {
+ if (tag[i]) {
+ dev_err(dd->dev, "GCM decryption: Tag Message
is wrong\n");
+ ret = -EBADMSG;
+ }
+ }
+ }
+
+ omap_aes_gcm_finish_req(dd, ret);
+ omap_aes_gcm_handle_queue(dd, NULL);
+}
+
+static int omap_aes_gcm_copy_buffers(struct omap_aes_dev *dd,
+ struct aead_request *req)
+{
+ void *buf_in;
+ int pages, alen, clen, cryptlen, nsg;
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ unsigned int authlen = crypto_aead_authsize(aead);
+ u32 dec = !(dd->flags & FLAGS_ENCRYPT);
+ struct scatterlist *input, *assoc, tmp[2];
+
+ alen = ALIGN(req->assoclen, AES_BLOCK_SIZE);
+ cryptlen = req->cryptlen - (dec * authlen);
+ clen = ALIGN(cryptlen, AES_BLOCK_SIZE);
+
+ dd->sgs_copied = 0;
+
+ nsg = !!(req->assoclen && req->cryptlen);
+
+ assoc = &req->src[0];
+ sg_init_table(dd->in_sgl, nsg + 1);
+ if (req->assoclen) {
+ if (omap_aes_check_aligned(assoc, req->assoclen)) {
+ dd->sgs_copied |= AES_ASSOC_DATA_COPIED;
+ pages = get_order(alen);
+ buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
+ if (!buf_in) {
+ pr_err("Couldn't allocate for unaligncases.\n");
+ return -1;
+ }
+
+ scatterwalk_map_and_copy(buf_in, assoc, 0,
+ req->assoclen, 0);
+ memset(buf_in + req->assoclen, 0, alen - req->assoclen);
+ } else {
+ buf_in = sg_virt(req->assoc);
+ }
+ sg_set_buf(dd->in_sgl, buf_in, alen);
+ }
+
+ if (req->cryptlen) {
+ input = scatterwalk_ffwd(tmp, req->src, req->assoclen);
+
+ if (omap_aes_check_aligned(input, req->cryptlen)) {
+ dd->sgs_copied |= AES_IN_DATA_COPIED;
+ pages = get_order(clen);
+ buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
+ if (!buf_in) {
+ pr_err("Couldn't allocate for unaligncases.\n");
+ return -1;
+ }
+
+ scatterwalk_map_and_copy(buf_in, input, 0, cryptlen, 0);
+ memset(buf_in + cryptlen, 0, clen - cryptlen);
+ } else {
+ buf_in = sg_virt(input);
+ }
+ sg_set_buf(&dd->in_sgl[nsg], buf_in, clen);
+ }
+
+ dd->in_sg = dd->in_sgl;
+ dd->total = cryptlen;
+ dd->assoc_len = req->assoclen;
+ dd->authsize = authlen;
+
+ if (omap_aes_check_aligned(req->dst, cryptlen + req->assoclen)) {
+ pages = get_order(clen);
+
+ buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
+
+ if (!buf_in) {
+ pr_err("Couldn't allocate for unaligned cases.\n");
+ return -1;
+ }
+
+ sg_init_one(&dd->out_sgl, buf_in, clen);
+ dd->out_sg = &dd->out_sgl;
+ dd->orig_out = req->dst;
+ dd->sgs_copied |= AES_OUT_DATA_COPIED;
+ } else {
+ dd->out_sg = scatterwalk_ffwd(tmp, req->dst, req->assoclen);
+ }
+
+ dd->in_sg_len = scatterwalk_bytes_sglen(dd->in_sg, alen + clen);
+ dd->out_sg_len = scatterwalk_bytes_sglen(dd->out_sg, clen);
+
+ return 0;
+}
+
+static void tcrypt_complete(struct crypto_async_request *req, int err)
+{
+ struct tcrypt_result *res = req->data;
+
+ if (err == -EINPROGRESS)
+ return;
+
+ res->err = err;
+ complete(&res->completion);
+}
+
+static int do_encrypt_iv(struct aead_request *req, u32 *tag)
+{
+ struct scatterlist iv_sg;
+ struct ablkcipher_request *ablk_req;
+ struct crypto_ablkcipher *tfm;
+ struct tcrypt_result result;
+ struct omap_aes_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
+ int ret = 0;
+
+ tfm = crypto_alloc_ablkcipher("ctr(aes)", 0, 0);
+ ablk_req = ablkcipher_request_alloc(tfm, GFP_KERNEL);
+ if (!ablk_req) {
+ pr_err("skcipher: Failed to allocate request\n");
+ return -1;
+ }
+
+ init_completion(&result.completion);
+
+ sg_init_one(&iv_sg, tag, AES_BLOCK_SIZE);
+ ablkcipher_request_set_callback(ablk_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
+ tcrypt_complete, &result);
+ ret = crypto_ablkcipher_setkey(tfm, (u8 *)ctx->key, ctx->keylen);
+ ablkcipher_request_set_crypt(ablk_req, &iv_sg, &iv_sg, AES_BLOCK_SIZE,
+ req->iv);
+ ret = crypto_ablkcipher_encrypt(ablk_req);
+ switch (ret) {
+ case 0:
+ break;
+ case -EINPROGRESS:
+ case -EBUSY:
+ ret = wait_for_completion_interruptible(&result.completion);
+ if (!ret) {
+ ret = result.err;
+ if (!ret) {
+ reinit_completion(&result.completion);
+ break;
+ }
+ }
+ /* fall through */
+ default:
+ pr_err("Encryptio of IV failed for GCM mode");
+ break;
+ }
+
+ ablkcipher_request_free(ablk_req);
+ crypto_free_ablkcipher(tfm);
+ return ret;
+}
+
+void omap_aes_gcm_dma_out_callback(void *data)
+{
+ struct omap_aes_dev *dd = data;
+ int i, val;
+ u32 *auth_tag, tag[4];
+
+ if (!(dd->flags & FLAGS_ENCRYPT))
+ scatterwalk_map_and_copy(tag, dd->aead_req->src,
+ dd->total + dd->assoc_len,
+ dd->authsize, 0);
+
+ auth_tag = dd->ctx->auth_tag;
+ for (i = 0; i < 4; i++) {
+ val = omap_aes_read(dd, AES_REG_TAG_N(dd, i));
+ auth_tag[i] = val ^ auth_tag[i];
+ if (!(dd->flags & FLAGS_ENCRYPT))
+ auth_tag[i] = auth_tag[i] ^ tag[i];
+ }
+
+ omap_aes_gcm_done_task(dd);
+}
+
+static int omap_aes_gcm_handle_queue(struct omap_aes_dev *dd,
+ struct aead_request *req)
+{
+ struct omap_aes_ctx *ctx;
+ struct crypto_async_request *async_req, *backlog;
+ struct omap_aes_reqctx *rctx;
+ unsigned long flags;
+ int err, ret = 0;
+
+ spin_lock_irqsave(&dd->lock, flags);
+ if (req)
+ ret = crypto_enqueue_request(&dd->aead_queue, &req->base);
+ if (dd->flags & FLAGS_BUSY) {
+ spin_unlock_irqrestore(&dd->lock, flags);
+ return ret;
+ }
+ backlog = crypto_get_backlog(&dd->aead_queue);
+ async_req = crypto_dequeue_request(&dd->aead_queue);
+ if (async_req)
+ dd->flags |= FLAGS_BUSY;
+ spin_unlock_irqrestore(&dd->lock, flags);
+
+ if (!async_req)
+ return ret;
+
+ if (backlog)
+ backlog->complete(backlog, -EINPROGRESS);
+
+ req = aead_request_cast(async_req);
+
+ ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
+ rctx = aead_request_ctx(req);
+
+ dd->ctx = ctx;
+ ctx->dd = dd;
+ dd->aead_req = req;
+
+ rctx->mode &= FLAGS_MODE_MASK;
+ dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
+
+ err = omap_aes_gcm_copy_buffers(dd, req);
+ if (err)
+ return err;
+
+ err = omap_aes_write_ctrl(dd);
+ if (!err)
+ err = omap_aes_crypt_dma_start(dd);
+
+ if (err) {
+ omap_aes_gcm_finish_req(dd, err);
+ omap_aes_gcm_handle_queue(dd, NULL);
+ }
+
+ return ret;
+}
+
+static int omap_aes_gcm_crypt(struct aead_request *req, unsigned long mode)
+{
+ struct omap_aes_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
+ struct omap_aes_reqctx *rctx = aead_request_ctx(req);
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ unsigned int authlen = crypto_aead_authsize(aead);
+ struct omap_aes_dev *dd;
+ __be32 counter = cpu_to_be32(1);
+ int err;
+
+ memset(ctx->auth_tag, 0, sizeof(ctx->auth_tag));
+ memcpy(req->iv + 12, &counter, 4);
+
+ err = do_encrypt_iv(req, ctx->auth_tag);
+ if (err)
+ return err;
+
+ if (req->assoclen + req->cryptlen == 0) {
+ scatterwalk_map_and_copy(ctx->auth_tag, req->dst, 0, authlen,
+ 1);
+ return 0;
+ }
+
+ dd = omap_aes_find_dev(ctx);
+ if (!dd)
+ return -ENODEV;
+ rctx->mode = mode;
+
+ return omap_aes_gcm_handle_queue(dd, req);
+}
+
+int omap_aes_gcm_encrypt(struct aead_request *req)
+{
+ return omap_aes_gcm_crypt(req, FLAGS_ENCRYPT | FLAGS_GCM);
+}
+
+int omap_aes_gcm_decrypt(struct aead_request *req)
+{
+ return omap_aes_gcm_crypt(req, FLAGS_GCM);
+}
+
+int omap_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct omap_aes_ctx *ctx = crypto_aead_ctx(tfm);
+
+ if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
+ keylen != AES_KEYSIZE_256)
+ return -EINVAL;
+
+ memcpy(ctx->key, key, keylen);
+ ctx->keylen = keylen;
+
+ return 0;
+}
diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index eba2314..d1b4813 100644
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -36,157 +36,8 @@
#include <linux/interrupt.h>
#include <crypto/scatterwalk.h>
#include <crypto/aes.h>
-
-#define DST_MAXBURST 4
-#define DMA_MIN (DST_MAXBURST * sizeof(u32))
-
-#define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
-
-/* OMAP TRM gives bitfields as start:end, where start is the higher bit
- number. For example 7:0 */
-#define FLD_MASK(start, end) (((1 << ((start) - (end) + 1)) - 1) << (end))
-#define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end))
-
-#define AES_REG_KEY(dd, x) ((dd)->pdata->key_ofs - \
- ((x ^ 0x01) * 0x04))
-#define AES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04))
-
-#define AES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs)
-#define AES_REG_CTRL_CTR_WIDTH_MASK GENMASK(8, 7)
-#define AES_REG_CTRL_CTR_WIDTH_32 0
-#define AES_REG_CTRL_CTR_WIDTH_64 BIT(7)
-#define AES_REG_CTRL_CTR_WIDTH_96 BIT(8)
-#define AES_REG_CTRL_CTR_WIDTH_128 GENMASK(8, 7)
-#define AES_REG_CTRL_CTR BIT(6)
-#define AES_REG_CTRL_CBC BIT(5)
-#define AES_REG_CTRL_KEY_SIZE GENMASK(4, 3)
-#define AES_REG_CTRL_DIRECTION BIT(2)
-#define AES_REG_CTRL_INPUT_READY BIT(1)
-#define AES_REG_CTRL_OUTPUT_READY BIT(0)
-#define AES_REG_CTRL_MASK GENMASK(24, 2)
-
-#define AES_REG_DATA_N(dd, x) ((dd)->pdata->data_ofs + ((x) * 0x04))
-
-#define AES_REG_REV(dd) ((dd)->pdata->rev_ofs)
-
-#define AES_REG_MASK(dd) ((dd)->pdata->mask_ofs)
-#define AES_REG_MASK_SIDLE BIT(6)
-#define AES_REG_MASK_START BIT(5)
-#define AES_REG_MASK_DMA_OUT_EN BIT(3)
-#define AES_REG_MASK_DMA_IN_EN BIT(2)
-#define AES_REG_MASK_SOFTRESET BIT(1)
-#define AES_REG_AUTOIDLE BIT(0)
-
-#define AES_REG_LENGTH_N(x) (0x54 + ((x) * 0x04))
-
-#define AES_REG_IRQ_STATUS(dd) ((dd)->pdata->irq_status_ofs)
-#define AES_REG_IRQ_ENABLE(dd) ((dd)->pdata->irq_enable_ofs)
-#define AES_REG_IRQ_DATA_IN BIT(1)
-#define AES_REG_IRQ_DATA_OUT BIT(2)
-#define DEFAULT_TIMEOUT (5*HZ)
-
-#define FLAGS_MODE_MASK 0x000f
-#define FLAGS_ENCRYPT BIT(0)
-#define FLAGS_CBC BIT(1)
-#define FLAGS_GIV BIT(2)
-#define FLAGS_CTR BIT(3)
-
-#define FLAGS_INIT BIT(4)
-#define FLAGS_FAST BIT(5)
-#define FLAGS_BUSY BIT(6)
-
-#define AES_BLOCK_WORDS (AES_BLOCK_SIZE >> 2)
-
-struct omap_aes_ctx {
- struct omap_aes_dev *dd;
-
- int keylen;
- u32 key[AES_KEYSIZE_256 / sizeof(u32)];
- unsigned long flags;
-};
-
-struct omap_aes_reqctx {
- unsigned long mode;
-};
-
-#define OMAP_AES_QUEUE_LENGTH 1
-#define OMAP_AES_CACHE_SIZE 0
-
-struct omap_aes_algs_info {
- struct crypto_alg *algs_list;
- unsigned int size;
- unsigned int registered;
-};
-
-struct omap_aes_pdata {
- struct omap_aes_algs_info *algs_info;
- unsigned int algs_info_size;
-
- void (*trigger)(struct omap_aes_dev *dd, int length);
-
- u32 key_ofs;
- u32 iv_ofs;
- u32 ctrl_ofs;
- u32 data_ofs;
- u32 rev_ofs;
- u32 mask_ofs;
- u32 irq_enable_ofs;
- u32 irq_status_ofs;
-
- u32 dma_enable_in;
- u32 dma_enable_out;
- u32 dma_start;
-
- u32 major_mask;
- u32 major_shift;
- u32 minor_mask;
- u32 minor_shift;
-};
-
-struct omap_aes_dev {
- struct list_head list;
- unsigned long phys_base;
- void __iomem *io_base;
- struct omap_aes_ctx *ctx;
- struct device *dev;
- 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;
-
- /*
- * total is used by PIO mode for book keeping so introduce
- * variable total_save as need it to calc page_order
- */
- size_t total;
- size_t total_save;
-
- struct scatterlist *in_sg;
- struct scatterlist *out_sg;
-
- /* Buffers for copying for unaligned cases */
- struct scatterlist in_sgl;
- struct scatterlist out_sgl;
- struct scatterlist *orig_out;
- int sgs_copied;
-
- struct scatter_walk in_walk;
- struct scatter_walk out_walk;
- int dma_in;
- struct dma_chan *dma_lch_in;
- int dma_out;
- struct dma_chan *dma_lch_out;
- int in_sg_len;
- int out_sg_len;
- int pio_only;
- const struct omap_aes_pdata *pdata;
-};
+#include <crypto/internal/aead.h>
+#include "omap-aes.h"
/* keep registered devices data here */
static LIST_HEAD(dev_list);
@@ -202,7 +53,7 @@ static DEFINE_SPINLOCK(list_lock);
_read_ret; \
})
#else
-static inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
+inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
{
return __raw_readl(dd->io_base + offset);
}
@@ -216,7 +67,7 @@ static inline u32 omap_aes_read(struct omap_aes_dev *dd, u32
offset)
__raw_writel(value, dd->io_base + offset); \
} while (0)
#else
-static inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
+inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
u32 value)
{
__raw_writel(value, dd->io_base + offset);
@@ -251,7 +102,7 @@ static int omap_aes_hw_init(struct omap_aes_dev *dd)
return 0;
}
-static int omap_aes_write_ctrl(struct omap_aes_dev *dd)
+int omap_aes_write_ctrl(struct omap_aes_dev *dd)
{
unsigned int key32;
int i, err;
@@ -263,7 +114,11 @@ static int omap_aes_write_ctrl(struct omap_aes_dev *dd)
key32 = dd->ctx->keylen / sizeof(u32);
- /* it seems a key should always be set even if it has not changed */
+ /* 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]));
@@ -272,12 +127,20 @@ static int omap_aes_write_ctrl(struct omap_aes_dev *dd)
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)
+ omap_aes_write_n(dd, AES_REG_IV(dd, 0),
+ (u32 *)dd->aead_req->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)
+
+ 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;
@@ -308,6 +171,8 @@ 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);
}
@@ -322,7 +187,7 @@ static void omap_aes_dma_stop(struct omap_aes_dev *dd)
omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask);
}
-static struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_ctx *ctx)
+struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_ctx *ctx)
{
struct omap_aes_dev *dd = NULL, *tmp;
@@ -410,12 +275,11 @@ static void sg_copy_buf(void *buf, struct scatterlist *sg,
scatterwalk_done(&walk, out, 0);
}
-static int omap_aes_crypt_dma(struct crypto_tfm *tfm,
- struct scatterlist *in_sg, struct scatterlist *out_sg,
- int in_sg_len, int out_sg_len)
+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 omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
- struct omap_aes_dev *dd = ctx->dd;
struct dma_async_tx_descriptor *tx_in, *tx_out;
struct dma_slave_config cfg;
int ret;
@@ -476,7 +340,10 @@ static int omap_aes_crypt_dma(struct crypto_tfm *tfm,
return -EINVAL;
}
- tx_out->callback = omap_aes_dma_out_callback;
+ 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);
@@ -491,10 +358,8 @@ static int omap_aes_crypt_dma(struct crypto_tfm *tfm,
return 0;
}
-static int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
+int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
{
- struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
- crypto_ablkcipher_reqtfm(dd->req));
int err;
pr_debug("total: %d\n", dd->total);
@@ -515,7 +380,7 @@ static int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
}
}
- err = omap_aes_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len,
+ 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);
@@ -537,7 +402,7 @@ static void omap_aes_finish_req(struct omap_aes_dev *dd,
int err)
req->base.complete(&req->base, err);
}
-static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
+int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
{
int err = 0;
@@ -551,7 +416,7 @@ static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
return err;
}
-static int omap_aes_check_aligned(struct scatterlist *sg, int total)
+int omap_aes_check_aligned(struct scatterlist *sg, int total)
{
int len = 0;
@@ -566,6 +431,9 @@ static int omap_aes_check_aligned(struct scatterlist *sg,
int total)
len += sg->length;
sg = sg_next(sg);
+
+ if (len >= total)
+ break;
}
if (len != total)
@@ -594,9 +462,9 @@ static int omap_aes_copy_sgs(struct omap_aes_dev *dd)
sg_copy_buf(buf_in, dd->in_sg, 0, dd->total, 0);
- sg_init_table(&dd->in_sgl, 1);
- sg_set_buf(&dd->in_sgl, buf_in, total);
- dd->in_sg = &dd->in_sgl;
+ sg_init_table(dd->in_sgl, 1);
+ sg_set_buf(dd->in_sgl, buf_in, total);
+ dd->in_sg = dd->in_sgl;
sg_init_table(&dd->out_sgl, 1);
sg_set_buf(&dd->out_sgl, buf_out, total);
@@ -665,6 +533,7 @@ static int omap_aes_handle_queue(struct omap_aes_dev *dd,
ctx->dd = dd;
err = omap_aes_write_ctrl(dd);
+
if (!err)
err = omap_aes_crypt_dma_start(dd);
if (err) {
@@ -694,7 +563,7 @@ static void omap_aes_done_task(unsigned long data)
}
if (dd->sgs_copied) {
- buf_in = sg_virt(&dd->in_sgl);
+ buf_in = sg_virt(dd->in_sgl);
buf_out = sg_virt(&dd->out_sgl);
sg_copy_buf(buf_out, dd->orig_out, 0, dd->total_save, 1);
@@ -811,6 +680,30 @@ static int omap_aes_cra_init(struct crypto_tfm *tfm)
return 0;
}
+static int omap_aes_gcm_cra_init(struct crypto_aead *tfm)
+{
+ struct omap_aes_dev *dd = NULL;
+ 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);
+
+ return 0;
+}
+
static void omap_aes_cra_exit(struct crypto_tfm *tfm)
{
struct omap_aes_dev *dd = NULL;
@@ -825,6 +718,11 @@ static void omap_aes_cra_exit(struct crypto_tfm *tfm)
pm_runtime_put_sync(dd->dev);
}
+static void omap_aes_gcm_cra_exit(struct crypto_aead *tfm)
+{
+ omap_aes_cra_exit(crypto_aead_tfm(tfm));
+}
+
/* ********************** ALGS ************************************ */
static struct crypto_alg algs_ecb_cbc[] = {
@@ -909,6 +807,34 @@ static struct omap_aes_algs_info
omap_aes_algs_info_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 = 12,
+ .maxauthsize = AES_BLOCK_SIZE,
+ .setkey = omap_aes_gcm_setkey,
+ .encrypt = omap_aes_gcm_encrypt,
+ .decrypt = omap_aes_gcm_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),
@@ -962,6 +888,7 @@ static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
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,
@@ -1165,6 +1092,7 @@ 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;
@@ -1179,6 +1107,7 @@ static int omap_aes_probe(struct platform_device *pdev)
spin_lock_init(&dd->lock);
crypto_init_queue(&dd->queue, OMAP_AES_QUEUE_LENGTH);
+ crypto_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);
@@ -1252,7 +1181,26 @@ static int omap_aes_probe(struct platform_device *pdev)
}
}
+ 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);
+ INIT_LIST_HEAD(&algp->cra_list);
+
+ err = crypto_register_aead(aalg);
+ if (err)
+ goto err_aead_algs;
+
+ dd->pdata->aead_algs_info->registered++;
+ }
+
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--)
@@ -1274,6 +1222,7 @@ err_data:
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)
@@ -1288,6 +1237,11 @@ static int omap_aes_remove(struct platform_device *pdev)
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);
+ }
+
tasklet_kill(&dd->done_task);
tasklet_kill(&dd->queue_task);
omap_aes_dma_cleanup(dd);
diff --git a/drivers/crypto/omap-aes.h b/drivers/crypto/omap-aes.h
new file mode 100644
index 0000000..f9f8c5f
--- /dev/null
+++ b/drivers/crypto/omap-aes.h
@@ -0,0 +1,212 @@
+/*
+ * Cryptographic API.
+ *
+ * Support for OMAP AES HW ACCELERATOR defines
+ *
+ * Copyright (c) 2015 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.
+ *
+ */
+#ifndef __OMAP_AES_REGS_H__
+#define __OMAP_AES_REGS_H__
+
+#define DST_MAXBURST 4
+#define DMA_MIN (DST_MAXBURST * sizeof(u32))
+
+#define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
+
+/* OMAP TRM gives bitfields as start:end, where start is the higher bit
+ number. For example 7:0 */
+#define FLD_MASK(start, end) (((1 << ((start) - (end) + 1)) - 1) << (end))
+#define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end))
+
+#define AES_REG_KEY(dd, x) ((dd)->pdata->key_ofs - \
+ ((x ^ 0x01) * 0x04))
+#define AES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04))
+
+#define AES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs)
+#define AES_REG_CTRL_CONTEXT_READY BIT(31)
+#define AES_REG_CTRL_CTR_WIDTH_MASK GENMASK(8, 7)
+#define AES_REG_CTRL_CTR_WIDTH_32 0
+#define AES_REG_CTRL_CTR_WIDTH_64 BIT(7)
+#define AES_REG_CTRL_CTR_WIDTH_96 BIT(8)
+#define AES_REG_CTRL_CTR_WIDTH_128 GENMASK(8, 7)
+#define AES_REG_CTRL_GCM GENMASK(17, 16)
+#define AES_REG_CTRL_CTR BIT(6)
+#define AES_REG_CTRL_CBC BIT(5)
+#define AES_REG_CTRL_KEY_SIZE GENMASK(4, 3)
+#define AES_REG_CTRL_DIRECTION BIT(2)
+#define AES_REG_CTRL_INPUT_READY BIT(1)
+#define AES_REG_CTRL_OUTPUT_READY BIT(0)
+#define AES_REG_CTRL_MASK GENMASK(24, 2)
+
+#define AES_REG_C_LEN_0 0x54
+#define AES_REG_C_LEN_1 0x58
+#define AES_REG_A_LEN 0x5C
+
+#define AES_REG_DATA_N(dd, x) ((dd)->pdata->data_ofs + ((x) * 0x04))
+#define AES_REG_TAG_N(dd, x) (0x70 + ((x) * 0x04))
+
+#define AES_REG_REV(dd) ((dd)->pdata->rev_ofs)
+
+#define AES_REG_MASK(dd) ((dd)->pdata->mask_ofs)
+#define AES_REG_MASK_SIDLE BIT(6)
+#define AES_REG_MASK_START BIT(5)
+#define AES_REG_MASK_DMA_OUT_EN BIT(3)
+#define AES_REG_MASK_DMA_IN_EN BIT(2)
+#define AES_REG_MASK_SOFTRESET BIT(1)
+#define AES_REG_AUTOIDLE BIT(0)
+
+#define AES_REG_LENGTH_N(x) (0x54 + ((x) * 0x04))
+
+#define AES_REG_IRQ_STATUS(dd) ((dd)->pdata->irq_status_ofs)
+#define AES_REG_IRQ_ENABLE(dd) ((dd)->pdata->irq_enable_ofs)
+#define AES_REG_IRQ_DATA_IN BIT(1)
+#define AES_REG_IRQ_DATA_OUT BIT(2)
+#define DEFAULT_TIMEOUT (5 * HZ)
+
+#define FLAGS_MODE_MASK 0x001f
+#define FLAGS_ENCRYPT BIT(0)
+#define FLAGS_CBC BIT(1)
+#define FLAGS_GIV BIT(2)
+#define FLAGS_CTR BIT(3)
+#define FLAGS_GCM BIT(4)
+
+#define FLAGS_INIT BIT(5)
+#define FLAGS_FAST BIT(6)
+#define FLAGS_BUSY BIT(7)
+
+#define AES_ASSOC_DATA_COPIED BIT(0)
+#define AES_IN_DATA_COPIED BIT(1)
+#define AES_OUT_DATA_COPIED BIT(2)
+
+#define AES_BLOCK_WORDS (AES_BLOCK_SIZE >> 2)
+
+struct tcrypt_result {
+ struct completion completion;
+ int err;
+};
+
+struct omap_aes_ctx {
+ struct omap_aes_dev *dd;
+
+ int keylen;
+ u32 key[AES_KEYSIZE_256 / sizeof(u32)];
+ u32 auth_tag[AES_BLOCK_SIZE / sizeof(u32)];
+ unsigned long flags;
+};
+
+struct omap_aes_reqctx {
+ unsigned long mode;
+};
+
+#define OMAP_AES_QUEUE_LENGTH 1
+#define OMAP_AES_CACHE_SIZE 0
+
+struct omap_aes_algs_info {
+ struct crypto_alg *algs_list;
+ unsigned int size;
+ unsigned int registered;
+};
+
+struct omap_aes_aead_algs {
+ struct aead_alg *algs_list;
+ unsigned int size;
+ unsigned int registered;
+};
+
+struct omap_aes_pdata {
+ struct omap_aes_algs_info *algs_info;
+ unsigned int algs_info_size;
+ struct omap_aes_aead_algs *aead_algs_info;
+
+ void (*trigger)(struct omap_aes_dev *dd, int length);
+
+ u32 key_ofs;
+ u32 iv_ofs;
+ u32 ctrl_ofs;
+ u32 data_ofs;
+ u32 rev_ofs;
+ u32 mask_ofs;
+ u32 irq_enable_ofs;
+ u32 irq_status_ofs;
+
+ u32 dma_enable_in;
+ u32 dma_enable_out;
+ u32 dma_start;
+
+ u32 major_mask;
+ u32 major_shift;
+ u32 minor_mask;
+ u32 minor_shift;
+};
+
+struct omap_aes_dev {
+ struct list_head list;
+ unsigned long phys_base;
+ void __iomem *io_base;
+ struct omap_aes_ctx *ctx;
+ struct device *dev;
+ unsigned long flags;
+ int err;
+
+ /* Lock to acquire omap_aes_dd */
+ spinlock_t lock;
+ struct crypto_queue queue;
+ struct crypto_queue aead_queue;
+
+ struct tasklet_struct done_task;
+ struct tasklet_struct queue_task;
+
+ struct ablkcipher_request *req;
+ struct aead_request *aead_req;
+
+ /*
+ * total is used by PIO mode for book keeping so introduce
+ * variable total_save as need it to calc page_order
+ */
+ size_t total;
+ size_t total_save;
+ size_t assoc_len;
+ size_t authsize;
+
+ struct scatterlist *in_sg;
+ struct scatterlist *assoc_sg;
+ struct scatterlist *out_sg;
+
+ /* Buffers for copying for unaligned cases */
+ struct scatterlist in_sgl[2];
+ struct scatterlist out_sgl;
+ struct scatterlist aead_sgl[2];
+ struct scatterlist *orig_out;
+ int sgs_copied;
+
+ struct scatter_walk in_walk;
+ struct scatter_walk out_walk;
+ int dma_in;
+ struct dma_chan *dma_lch_in;
+ int dma_out;
+ struct dma_chan *dma_lch_out;
+ int in_sg_len;
+ int out_sg_len;
+ int pio_only;
+ const struct omap_aes_pdata *pdata;
+};
+
+u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset);
+void omap_aes_write(struct omap_aes_dev *dd, u32 offset, u32 value);
+struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_ctx *ctx);
+int omap_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
+ unsigned int keylen);
+int omap_aes_gcm_encrypt(struct aead_request *req);
+int omap_aes_gcm_decrypt(struct aead_request *req);
+int omap_aes_write_ctrl(struct omap_aes_dev *dd);
+int omap_aes_check_aligned(struct scatterlist *sg, int total);
+int omap_aes_crypt_dma_start(struct omap_aes_dev *dd);
+void omap_aes_gcm_dma_out_callback(void *data);
+int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd);
+
+#endif
--
1.9.1
--
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