Re: [PATCH 05/10] crypto: omap-aes: Add support for GCM mode
From: Lokesh Vutla
Date: Thu Jul 02 2015 - 06:10:53 EST
On Thursday 02 July 2015 01:34 PM, Felipe Balbi wrote:
> On Thu, Jul 02, 2015 at 10:48:35AM +0530, Lokesh Vutla wrote:
>> OMAP AES hw supports aes gcm mode.
>
> here you refer to it as 'gcm'
Will update it in next revision.
>
>> Adding support for GCM mode in omap-aes driver.
>
> while here and in subject as 'GCM'.
>
>> Signed-off-by: Lokesh Vutla <lokeshvutla@xxxxxx>
>> ---
>> drivers/crypto/Makefile | 3 +-
>> drivers/crypto/omap-aes-gcm.c | 304 +++++++++++++++++++++++++++++++++++++++++
>
> why does this have to be a separate source file ? Patch gets really
> large with all the macro and structure definition being shuffled around.
GCM is an aead(authenticated encryption and decryption) but
other modes are just block ciphers(encryption and decryption).
Crypto library defines differ structures and routines for aead and normal
block ciphers.
So I started off with a new driver, and later able to combine common parts.
Since GCM is a bit different from all other modes, I left it in a new file.
If I combine into same file, it will be difficult to track all these fucntions
at a time.
Thanks and regards,
Lokesh
>
>> drivers/crypto/omap-aes.c | 238 +++++++++-----------------------
>> drivers/crypto/omap-aes.h | 205 +++++++++++++++++++++++++++
>> 4 files changed, 575 insertions(+), 175 deletions(-)
>> create mode 100644 drivers/crypto/omap-aes-gcm.c
>> create mode 100644 drivers/crypto/omap-aes.h
>>
>> diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
>> index fb84be7..3afad7b 100644
>> --- a/drivers/crypto/Makefile
>> +++ b/drivers/crypto/Makefile
>> @@ -13,7 +13,8 @@ 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
>
> ... I mean, considering you unconditionally link these two together...
>
>> diff --git a/drivers/crypto/omap-aes-gcm.c b/drivers/crypto/omap-aes-gcm.c
>> new file mode 100644
>> index 0000000..1be9d91
>> --- /dev/null
>> +++ b/drivers/crypto/omap-aes-gcm.c
>> @@ -0,0 +1,304 @@
>> +/*
>> + * 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/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/omap-dma.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 "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)
>> +{
>> + u8 *tag;
>> + int alen, clen, i, ret = 0, nsg;
>> +
>> + alen = ALIGN(dd->assoc_len, AES_BLOCK_SIZE);
>> + clen = ALIGN(dd->total, AES_BLOCK_SIZE);
>> +
>> + nsg = 1 + !!(dd->assoc_len && dd->total);
>> +
>> + 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);
>> + }
>> +
>> + if (dd->flags & FLAGS_ENCRYPT)
>> + scatterwalk_map_and_copy(dd->ctx->auth_tag, dd->aead_req->dst,
>> + dd->total, dd->authsize, 1);
>> +
>> + 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 alen, clen;
>> + struct crypto_aead *aead = crypto_aead_reqtfm(req);
>> + unsigned int authlen = crypto_aead_authsize(aead);
>> + u32 dec = !(dd->flags & FLAGS_ENCRYPT);
>> +
>> + alen = req->assoclen;
>> + clen = req->cryptlen - (dec * authlen);
>> +
>> + dd->sgs_copied = 0;
>> +
>> + sg_init_table(dd->in_sgl, 2);
>> + buf_in = sg_virt(req->assoc);
>> + sg_set_buf(dd->in_sgl, buf_in, alen);
>> +
>> + buf_in = sg_virt(req->src);
>> + sg_set_buf(&dd->in_sgl[1], buf_in, clen);
>> +
>> + dd->in_sg = dd->in_sgl;
>> + dd->total = clen;
>> + dd->assoc_len = req->assoclen;
>> + dd->authsize = authlen;
>> + dd->out_sg = req->dst;
>> +
>> + 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);
>
> looks like you should check result here.
>
>> + 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");
>
> Encryption.
>
>> + 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->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];
>> + }
>> +
>> + /* dma_lch_out - completed */
>> + 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 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);
>> +
>> + /* Create E(K, IV) */
>> + err = do_encrypt_iv(req, ctx->auth_tag);
>> + if (err)
>> + return err;
>> +
>> + 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 d974ab6..e5e9a19 100644
>> --- a/drivers/crypto/omap-aes.c
>> +++ b/drivers/crypto/omap-aes.c
>> @@ -36,157 +36,7 @@
>> #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 "omap-aes.h"
>>
>> /* keep registered devices data here */
>> static LIST_HEAD(dev_list);
>> @@ -202,7 +52,7 @@ 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 +66,7 @@ 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 +101,7 @@ 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 +113,11 @@ 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 +126,20 @@ 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 +170,8 @@ 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 +186,7 @@ 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 +274,11 @@ 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 +339,10 @@ 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 +357,8 @@ 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 +379,7 @@ 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 +401,7 @@ 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 +415,7 @@ 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;
>>
>> @@ -594,9 +458,9 @@ 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 +529,7 @@ 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 +559,7 @@ 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 +676,30 @@ static int omap_aes_cra_init(struct crypto_tfm *tfm)
>> return 0;
>> }
>>
>> +static int omap_aes_gcm_cra_init(struct crypto_tfm *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->crt_aead.reqsize = sizeof(struct omap_aes_reqctx);
>> +
>> + return 0;
>> +}
>> +
>> static void omap_aes_cra_exit(struct crypto_tfm *tfm)
>> {
>> struct omap_aes_dev *dd = NULL;
>> @@ -899,7 +788,7 @@ static struct crypto_alg algs_ctr[] = {
>> .encrypt = omap_aes_ctr_encrypt,
>> .decrypt = omap_aes_ctr_decrypt,
>> }
>> -} ,
>> +},
>> };
>>
>> static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
>> @@ -1179,6 +1068,7 @@ 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);
>> diff --git a/drivers/crypto/omap-aes.h b/drivers/crypto/omap-aes.h
>> new file mode 100644
>> index 0000000..0863874
>> --- /dev/null
>> +++ b/drivers/crypto/omap-aes.h
>> @@ -0,0 +1,205 @@
>> +/*
>> + * 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_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;
>> +
>> + /* 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
>> --
>> 1.7.9.5
>>
>> --
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