* [PATCH v2 2/2] crypto: ti: Add driver for DTHE V2 AES Engine (ECB, CBC)
2025-04-11 9:13 [PATCH v2 0/2] Add support for Texas Instruments DTHE V2 crypto accelerator T Pratham
2025-04-11 9:13 ` [PATCH v2 1/2] dt-bindings: crypto: Add binding for TI DTHE V2 T Pratham
@ 2025-04-11 9:13 ` T Pratham
2025-04-16 7:03 ` Herbert Xu
1 sibling, 1 reply; 6+ messages in thread
From: T Pratham @ 2025-04-11 9:13 UTC (permalink / raw)
To: Herbert Xu, David S. Miller, T Pratham
Cc: Kamlesh Gurudasani, Praneeth Bajjuri, Vignesh Raghavendra,
Manorit Chawdhry, linux-kernel, linux-crypto
Add support for ECB and CBC modes in the AES Engine of the DTHE V2
hardware crypto accelerator.
Signed-off-by: T Pratham <t-pratham@ti.com>
---
MAINTAINERS | 1 +
drivers/crypto/Makefile | 1 +
drivers/crypto/ti/Kconfig | 10 +
drivers/crypto/ti/Makefile | 3 +
drivers/crypto/ti/dthev2-aes.c | 416 ++++++++++++++++++++++++++++++
drivers/crypto/ti/dthev2-common.c | 206 +++++++++++++++
drivers/crypto/ti/dthev2-common.h | 110 ++++++++
7 files changed, 747 insertions(+)
create mode 100644 drivers/crypto/ti/Kconfig
create mode 100644 drivers/crypto/ti/Makefile
create mode 100644 drivers/crypto/ti/dthev2-aes.c
create mode 100644 drivers/crypto/ti/dthev2-common.c
create mode 100644 drivers/crypto/ti/dthev2-common.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 90b640385b88..d6755eb0832b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -24179,6 +24179,7 @@ M: T Pratham <t-pratham@ti.com>
L: linux-crypto@vger.kernel.org
S: Supported
F: Documentation/devicetree/bindings/crypto/ti,dthev2.yaml
+F: drivers/crypto/ti/
TI DAVINCI MACHINE SUPPORT
M: Bartosz Golaszewski <brgl@bgdev.pl>
diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
index 22eadcc8f4a2..c0e8d4acc37c 100644
--- a/drivers/crypto/Makefile
+++ b/drivers/crypto/Makefile
@@ -48,3 +48,4 @@ obj-$(CONFIG_CRYPTO_DEV_AMLOGIC_GXL) += amlogic/
obj-y += intel/
obj-y += starfive/
obj-y += cavium/
+obj-$(CONFIG_ARCH_K3) += ti/
diff --git a/drivers/crypto/ti/Kconfig b/drivers/crypto/ti/Kconfig
new file mode 100644
index 000000000000..e75750de60ac
--- /dev/null
+++ b/drivers/crypto/ti/Kconfig
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config CRYPTO_DEV_TI_DTHEV2
+ tristate "Support for TI DTHE V2 crypto accelerators"
+ depends on CRYPTO && CRYPTO_HW && ARCH_K3
+ select CRYPTO_SKCIPHER
+ help
+ This enables support for the TI DTHE V2 hw crypto accelerator
+ which can be found on TI K3 SOCs. Selecting this enables use
+ of hardware acceleration for cryptographic algorithms on
+ these devices.
diff --git a/drivers/crypto/ti/Makefile b/drivers/crypto/ti/Makefile
new file mode 100644
index 000000000000..b883078f203d
--- /dev/null
+++ b/drivers/crypto/ti/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_CRYPTO_DEV_TI_DTHEV2) += dthev2.o
+dthev2-objs := dthev2-common.o dthev2-aes.o
diff --git a/drivers/crypto/ti/dthev2-aes.c b/drivers/crypto/ti/dthev2-aes.c
new file mode 100644
index 000000000000..0ff0d0434d2e
--- /dev/null
+++ b/drivers/crypto/ti/dthev2-aes.c
@@ -0,0 +1,416 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * K3 DTHE V2 crypto accelerator driver
+ *
+ * Copyright (C) Texas Instruments 2025 - https://www.ti.com
+ * Author: T Pratham <t-pratham@ti.com>
+ */
+
+#include <crypto/aead.h>
+#include <crypto/aes.h>
+#include <crypto/algapi.h>
+#include <crypto/internal/aead.h>
+#include <crypto/internal/skcipher.h>
+
+#include "dthev2-common.h"
+
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/scatterlist.h>
+
+/* Registers */
+
+// AES Engine
+#define DTHE_P_AES_BASE 0x7000
+#define DTHE_P_AES_KEY1_0 0x0038
+#define DTHE_P_AES_KEY1_1 0x003C
+#define DTHE_P_AES_KEY1_2 0x0030
+#define DTHE_P_AES_KEY1_3 0x0034
+#define DTHE_P_AES_KEY1_4 0x0028
+#define DTHE_P_AES_KEY1_5 0x002C
+#define DTHE_P_AES_KEY1_6 0x0020
+#define DTHE_P_AES_KEY1_7 0x0024
+#define DTHE_P_AES_IV_IN_0 0x0040
+#define DTHE_P_AES_IV_IN_1 0x0044
+#define DTHE_P_AES_IV_IN_2 0x0048
+#define DTHE_P_AES_IV_IN_3 0x004C
+#define DTHE_P_AES_CTRL 0x0050
+#define DTHE_P_AES_C_LENGTH_0 0x0054
+#define DTHE_P_AES_C_LENGTH_1 0x0058
+#define DTHE_P_AES_AUTH_LENGTH 0x005C
+#define DTHE_P_AES_DATA_IN_OUT 0x0060
+
+#define DTHE_P_AES_SYSCONFIG 0x0084
+#define DTHE_P_AES_IRQSTATUS 0x008C
+#define DTHE_P_AES_IRQENABLE 0x0090
+
+/* Register write values and macros */
+
+enum aes_ctrl_mode_masks {
+ AES_CTRL_ECB_MASK = 0x00,
+ AES_CTRL_CBC_MASK = BIT(5),
+};
+
+#define DTHE_AES_CTRL_MODE_CLEAR_MASK ~GENMASK(28, 5)
+
+#define DTHE_AES_CTRL_DIR_ENC BIT(2)
+
+#define DTHE_AES_CTRL_KEYSIZE_16B BIT(3)
+#define DTHE_AES_CTRL_KEYSIZE_24B BIT(4)
+#define DTHE_AES_CTRL_KEYSIZE_32B (BIT(3) | BIT(4))
+
+#define DTHE_AES_CTRL_SAVE_CTX_SET BIT(29)
+
+#define DTHE_AES_CTRL_OUTPUT_READY BIT_MASK(0)
+#define DTHE_AES_CTRL_INPUT_READY BIT_MASK(1)
+#define DTHE_AES_CTRL_SAVED_CTX_READY BIT_MASK(30)
+#define DTHE_AES_CTRL_CTX_READY BIT_MASK(31)
+
+#define DTHE_AES_SYSCONFIG_DMA_DATA_IN_OUT_EN GENMASK(6, 5)
+#define DTHE_AES_IRQENABLE_EN_ALL GENMASK(3, 0)
+
+/* Misc */
+#define AES_IV_SIZE AES_BLOCK_SIZE
+#define AES_BLOCK_WORDS (AES_BLOCK_SIZE / sizeof(u32))
+#define AES_IV_WORDS AES_BLOCK_WORDS
+
+static int dthe_cipher_init(struct crypto_skcipher *tfm)
+{
+ struct dthe_tfm_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct dthe_data *dev_data = dthe_get_dev(ctx);
+
+ void __iomem *aes_base_reg = dev_data->regs + DTHE_P_AES_BASE;
+ u32 aes_irqenable_val = readl_relaxed(aes_base_reg + DTHE_P_AES_IRQENABLE);
+ u32 aes_sysconfig_val = readl_relaxed(aes_base_reg + DTHE_P_AES_SYSCONFIG);
+
+ memzero_explicit(ctx, sizeof(*ctx));
+ ctx->dev_data = dev_data;
+ ctx->ctx_info.aes_ctx = kzalloc(sizeof(*ctx->ctx_info.aes_ctx), GFP_KERNEL);
+ if (!ctx->ctx_info.aes_ctx)
+ return -ENOMEM;
+
+ aes_sysconfig_val |= DTHE_AES_SYSCONFIG_DMA_DATA_IN_OUT_EN;
+ writel_relaxed(aes_sysconfig_val, aes_base_reg + DTHE_P_AES_SYSCONFIG);
+
+ aes_irqenable_val |= DTHE_AES_IRQENABLE_EN_ALL;
+ writel_relaxed(aes_irqenable_val, aes_base_reg + DTHE_P_AES_IRQENABLE);
+
+ return 0;
+}
+
+static void dthe_cipher_exit(struct crypto_skcipher *tfm)
+{
+ struct dthe_tfm_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct dthe_data *dev_data = dthe_get_dev(ctx);
+
+ void __iomem *aes_base_reg = dev_data->regs + DTHE_P_AES_BASE;
+
+ kfree(ctx->ctx_info.aes_ctx);
+ writel_relaxed(0, aes_base_reg + DTHE_P_AES_IRQENABLE);
+}
+
+static int dthe_ecb_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen)
+{
+ struct dthe_tfm_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+ if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_256)
+ return -EINVAL;
+
+ ctx->ctx_info.aes_ctx->mode = DTHE_AES_ECB;
+ ctx->ctx_info.aes_ctx->keylen = keylen;
+ memcpy(ctx->ctx_info.aes_ctx->key, key, keylen);
+
+ return 0;
+}
+
+static int dthe_cbc_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen)
+{
+ struct dthe_tfm_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+ if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_256)
+ return -EINVAL;
+
+ ctx->ctx_info.aes_ctx->mode = DTHE_AES_CBC;
+ ctx->ctx_info.aes_ctx->keylen = keylen;
+ memcpy(ctx->ctx_info.aes_ctx->key, key, keylen);
+
+ return 0;
+}
+
+static void dthe_aes_set_ctrl_key(struct dthe_tfm_ctx *ctx, u32 *iv_in)
+{
+ struct dthe_data *dev_data = dthe_get_dev(ctx);
+ struct dthe_aes_ctx *actx = ctx->ctx_info.aes_ctx;
+ void __iomem *aes_base_reg = dev_data->regs + DTHE_P_AES_BASE;
+ u32 ctrl_val = 0;
+
+ writel_relaxed(actx->key[0], aes_base_reg + DTHE_P_AES_KEY1_0);
+ writel_relaxed(actx->key[1], aes_base_reg + DTHE_P_AES_KEY1_1);
+ writel_relaxed(actx->key[2], aes_base_reg + DTHE_P_AES_KEY1_2);
+ writel_relaxed(actx->key[3], aes_base_reg + DTHE_P_AES_KEY1_3);
+
+ if (actx->keylen > AES_KEYSIZE_128) {
+ writel_relaxed(actx->key[4], aes_base_reg + DTHE_P_AES_KEY1_4);
+ writel_relaxed(actx->key[5], aes_base_reg + DTHE_P_AES_KEY1_5);
+ }
+ if (actx->keylen == AES_KEYSIZE_256) {
+ writel_relaxed(actx->key[6], aes_base_reg + DTHE_P_AES_KEY1_6);
+ writel_relaxed(actx->key[7], aes_base_reg + DTHE_P_AES_KEY1_7);
+ }
+
+ if (actx->enc)
+ ctrl_val |= DTHE_AES_CTRL_DIR_ENC;
+
+ if (actx->keylen == AES_KEYSIZE_128)
+ ctrl_val |= DTHE_AES_CTRL_KEYSIZE_16B;
+ else if (actx->keylen == AES_KEYSIZE_192)
+ ctrl_val |= DTHE_AES_CTRL_KEYSIZE_24B;
+ else
+ ctrl_val |= DTHE_AES_CTRL_KEYSIZE_32B;
+
+ // Write AES mode
+ ctrl_val &= DTHE_AES_CTRL_MODE_CLEAR_MASK;
+ switch (ctx->ctx_info.aes_ctx->mode) {
+ case DTHE_AES_ECB:
+ ctrl_val |= AES_CTRL_ECB_MASK;
+ break;
+ case DTHE_AES_CBC:
+ ctrl_val |= AES_CTRL_CBC_MASK;
+ break;
+ }
+
+ if (iv_in) {
+ ctrl_val |= DTHE_AES_CTRL_SAVE_CTX_SET;
+ for (int i = 0; i < AES_IV_WORDS; ++i)
+ writel_relaxed(iv_in[i],
+ aes_base_reg + DTHE_P_AES_IV_IN_0 + (DTHE_REG_SIZE * i));
+ }
+
+ writel_relaxed(ctrl_val, aes_base_reg + DTHE_P_AES_CTRL);
+}
+
+static void dthe_aes_dma_in_callback(void *data)
+{
+ struct skcipher_request *req = (struct skcipher_request *)data;
+ struct dthe_tfm_ctx *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+ struct dthe_data *dev_data = dthe_get_dev(ctx);
+
+ // For modes other than ECB, read IV_OUT
+ if (ctx->ctx_info.aes_ctx->mode != DTHE_AES_ECB) {
+ void __iomem *aes_base_reg = dev_data->regs + DTHE_P_AES_BASE;
+ u32 *iv_out = (u32 *)req->iv;
+
+ for (int i = 0; i < AES_IV_WORDS; ++i)
+ iv_out[i] = readl_relaxed(aes_base_reg +
+ DTHE_P_AES_IV_IN_0 +
+ (DTHE_REG_SIZE * i));
+ }
+
+ complete(&ctx->ctx_info.aes_ctx->aes_compl);
+}
+
+static int dthe_aes_run(struct skcipher_request *req)
+{
+ struct dthe_tfm_ctx *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+ struct dthe_data *dev_data = dthe_get_dev(ctx);
+ struct dthe_aes_ctx *actx = ctx->ctx_info.aes_ctx;
+
+ unsigned int len = req->cryptlen;
+ struct scatterlist *src = req->src;
+ struct scatterlist *dst = req->dst;
+
+ int src_nents = sg_nents_for_len(src, len);
+ int dst_nents;
+
+ int src_mapped_nents;
+ int dst_mapped_nents;
+
+ bool diff_dst;
+ enum dma_data_direction src_dir, dst_dir;
+
+ struct device *tx_dev, *rx_dev;
+ struct dma_async_tx_descriptor *desc_in, *desc_out;
+
+ int ret;
+
+ void __iomem *aes_base_reg = dev_data->regs + DTHE_P_AES_BASE;
+
+ if (src == dst) {
+ diff_dst = false;
+ src_dir = DMA_BIDIRECTIONAL;
+ dst_dir = DMA_BIDIRECTIONAL;
+ } else {
+ diff_dst = true;
+ src_dir = DMA_TO_DEVICE;
+ dst_dir = DMA_FROM_DEVICE;
+ }
+
+ tx_dev = dmaengine_get_dma_device(dev_data->dma_aes_tx);
+ rx_dev = dmaengine_get_dma_device(dev_data->dma_aes_rx);
+
+ src_mapped_nents = dma_map_sg(tx_dev, src, src_nents, src_dir);
+ if (src_mapped_nents == 0) {
+ ret = -EINVAL;
+ goto aes_err;
+ }
+
+ if (!diff_dst) {
+ dst_nents = src_nents;
+ dst_mapped_nents = src_mapped_nents;
+ } else {
+ dst_nents = sg_nents_for_len(dst, len);
+ dst_mapped_nents = dma_map_sg(rx_dev, dst, dst_nents, dst_dir);
+ if (dst_mapped_nents == 0) {
+ dma_unmap_sg(tx_dev, src, src_nents, src_dir);
+ ret = -EINVAL;
+ goto aes_err;
+ }
+ }
+
+ desc_in = dmaengine_prep_slave_sg(dev_data->dma_aes_rx, dst, dst_mapped_nents,
+ DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc_in) {
+ dev_err(dev_data->dev, "IN prep_slave_sg() failed\n");
+ ret = -EINVAL;
+ goto aes_prep_err;
+ }
+
+ desc_out = dmaengine_prep_slave_sg(dev_data->dma_aes_tx, src, src_mapped_nents,
+ DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc_out) {
+ dev_err(dev_data->dev, "OUT prep_slave_sg() failed\n");
+ ret = -EINVAL;
+ goto aes_prep_err;
+ }
+
+ desc_in->callback = dthe_aes_dma_in_callback;
+ desc_in->callback_param = req;
+
+ init_completion(&actx->aes_compl);
+
+ mutex_lock(&dev_data->aes_mutex);
+
+ if (actx->mode == DTHE_AES_ECB)
+ dthe_aes_set_ctrl_key(ctx, NULL);
+ else
+ dthe_aes_set_ctrl_key(ctx, (u32 *)req->iv);
+
+ writel_relaxed(req->cryptlen, aes_base_reg + DTHE_P_AES_C_LENGTH_0);
+
+ dmaengine_submit(desc_in);
+ dmaengine_submit(desc_out);
+
+ dma_async_issue_pending(dev_data->dma_aes_rx);
+ dma_async_issue_pending(dev_data->dma_aes_tx);
+
+ // Need to do a timeout to ensure mutex gets unlocked if DMA callback fails for any reason
+ ret = wait_for_completion_timeout(&actx->aes_compl, msecs_to_jiffies(DTHE_DMA_TIMEOUT_MS));
+ if (!ret) {
+ ret = -ETIMEDOUT;
+
+ for (int i = 0; i < AES_BLOCK_WORDS; ++i)
+ readl_relaxed(aes_base_reg + DTHE_P_AES_DATA_IN_OUT + (DTHE_REG_SIZE * i));
+ for (int i = 0; i < AES_IV_WORDS; ++i)
+ readl_relaxed(aes_base_reg + DTHE_P_AES_IV_IN_0 + (DTHE_REG_SIZE * i));
+ } else {
+ ret = 0;
+ }
+
+ mutex_unlock(&dev_data->aes_mutex);
+
+aes_prep_err:
+ dma_unmap_sg(tx_dev, src, src_nents, src_dir);
+ if (dst_dir != DMA_BIDIRECTIONAL)
+ dma_unmap_sg(rx_dev, dst, dst_nents, dst_dir);
+
+aes_err:
+ skcipher_request_complete(req, ret);
+ return ret;
+}
+
+static int dthe_aes_crypt(struct skcipher_request *req, int enc)
+{
+ struct dthe_tfm_ctx *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+
+ /*
+ * If data is not a multiple of AES_BLOCK_SIZE, need to return -EINVAL
+ * If data length input is zero, no need to do any operation.
+ */
+ if (req->cryptlen % AES_BLOCK_SIZE) {
+ skcipher_request_complete(req, -EINVAL);
+ return -EINVAL;
+ }
+ if (req->cryptlen == 0) {
+ skcipher_request_complete(req, 0);
+ return 0;
+ }
+
+ ctx->ctx_info.aes_ctx->enc = enc;
+ return dthe_aes_run(req);
+}
+
+static int dthe_aes_encrypt(struct skcipher_request *req)
+{
+ return dthe_aes_crypt(req, 1);
+}
+
+static int dthe_aes_decrypt(struct skcipher_request *req)
+{
+ return dthe_aes_crypt(req, 0);
+}
+
+static struct skcipher_alg cipher_algs[] = {
+ {
+ .setkey = dthe_ecb_aes_setkey,
+ .encrypt = dthe_aes_encrypt,
+ .decrypt = dthe_aes_decrypt,
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .base = {
+ .cra_name = "ecb(aes)",
+ .cra_driver_name = "ecb-aes-dthev2",
+ .cra_priority = 30000,
+ .cra_flags = CRYPTO_ALG_TYPE_SKCIPHER |
+ CRYPTO_ALG_KERN_DRIVER_ONLY,
+ .cra_alignmask = AES_BLOCK_SIZE - 1,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct dthe_tfm_ctx),
+ .cra_module = THIS_MODULE,
+ },
+ .init = dthe_cipher_init,
+ .exit = dthe_cipher_exit
+ }, /* ECB AES*/
+ {
+ .setkey = dthe_cbc_aes_setkey,
+ .encrypt = dthe_aes_encrypt,
+ .decrypt = dthe_aes_decrypt,
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .base = {
+ .cra_name = "cbc(aes)",
+ .cra_driver_name = "cbc-aes-dthev2",
+ .cra_priority = 30000,
+ .cra_flags = CRYPTO_ALG_TYPE_SKCIPHER |
+ CRYPTO_ALG_KERN_DRIVER_ONLY,
+ .cra_alignmask = AES_BLOCK_SIZE - 1,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct dthe_tfm_ctx),
+ .cra_module = THIS_MODULE,
+ },
+ .init = dthe_cipher_init,
+ .exit = dthe_cipher_exit
+ }, /* CBC AES */
+};
+
+int dthe_register_aes_algs(void)
+{
+ return crypto_register_skciphers(cipher_algs, ARRAY_SIZE(cipher_algs));
+}
+
+void dthe_unregister_aes_algs(void)
+{
+ crypto_unregister_skciphers(cipher_algs, ARRAY_SIZE(cipher_algs));
+}
diff --git a/drivers/crypto/ti/dthev2-common.c b/drivers/crypto/ti/dthev2-common.c
new file mode 100644
index 000000000000..bbf8dfc90441
--- /dev/null
+++ b/drivers/crypto/ti/dthev2-common.c
@@ -0,0 +1,206 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * K3 DTHE V2 crypto accelerator driver
+ *
+ * Copyright (C) Texas Instruments 2025 - https://www.ti.com
+ * Author: T Pratham <t-pratham@ti.com>
+ */
+
+#include <crypto/aes.h>
+#include <crypto/algapi.h>
+#include <crypto/internal/aead.h>
+#include <crypto/internal/skcipher.h>
+
+#include "dthev2-common.h"
+
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/dmapool.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/scatterlist.h>
+
+#define DRIVER_NAME "dthev2"
+
+static struct dthe_list dthe_dev_list = {
+ .dev_list = LIST_HEAD_INIT(dthe_dev_list.dev_list),
+ .lock = __SPIN_LOCK_UNLOCKED(dthe_dev_list.lock),
+};
+
+struct dthe_data *dthe_get_dev(struct dthe_tfm_ctx *ctx)
+{
+ struct dthe_data *dev_data;
+
+ if (ctx->dev_data)
+ return ctx->dev_data;
+
+ spin_lock_bh(&dthe_dev_list.lock);
+ dev_data = list_first_entry(&dthe_dev_list.dev_list, struct dthe_data, list);
+ if (dev_data)
+ list_move_tail(&dev_data->list, &dthe_dev_list.dev_list);
+ spin_unlock_bh(&dthe_dev_list.lock);
+
+ return dev_data;
+}
+
+static int dthe_dma_init(struct dthe_data *dev_data)
+{
+ int ret;
+ struct dma_slave_config cfg;
+
+ dev_data->dma_aes_rx = NULL;
+ dev_data->dma_aes_tx = NULL;
+ dev_data->dma_sha_tx = NULL;
+
+ dev_data->dma_aes_rx = dma_request_chan(dev_data->dev, "rx");
+ if (IS_ERR(dev_data->dma_aes_rx)) {
+ return dev_err_probe(dev_data->dev, PTR_ERR(dev_data->dma_aes_rx),
+ "Unable to request rx DMA channel\n");
+ }
+
+ dev_data->dma_aes_tx = dma_request_chan(dev_data->dev, "tx1");
+ if (IS_ERR(dev_data->dma_aes_tx)) {
+ ret = dev_err_probe(dev_data->dev, PTR_ERR(dev_data->dma_aes_tx),
+ "Unable to request tx1 DMA channel\n");
+ goto err_dma_aes_tx;
+ }
+
+ dev_data->dma_sha_tx = dma_request_chan(dev_data->dev, "tx2");
+ if (IS_ERR(dev_data->dma_sha_tx)) {
+ ret = dev_err_probe(dev_data->dev, PTR_ERR(dev_data->dma_sha_tx),
+ "Unable to request tx2 DMA channel\n");
+ goto err_dma_sha_tx;
+ }
+
+ memzero_explicit(&cfg, sizeof(cfg));
+
+ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ cfg.src_maxburst = 4;
+
+ ret = dmaengine_slave_config(dev_data->dma_aes_rx, &cfg);
+ if (ret) {
+ dev_err(dev_data->dev, "Can't configure IN dmaengine slave: %d\n", ret);
+ goto err_dma_config;
+ }
+
+ cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ cfg.dst_maxburst = 4;
+
+ ret = dmaengine_slave_config(dev_data->dma_aes_tx, &cfg);
+ if (ret) {
+ dev_err(dev_data->dev, "Can't configure OUT dmaengine slave: %d\n", ret);
+ goto err_dma_config;
+ }
+
+ return 0;
+
+err_dma_config:
+ dma_release_channel(dev_data->dma_sha_tx);
+err_dma_sha_tx:
+ dma_release_channel(dev_data->dma_aes_tx);
+err_dma_aes_tx:
+ dma_release_channel(dev_data->dma_aes_rx);
+
+ return ret;
+}
+
+static int dthe_register_algs(void)
+{
+ return dthe_register_aes_algs();
+}
+
+static void dthe_unregister_algs(void)
+{
+ dthe_unregister_aes_algs();
+}
+
+static int dthe_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct dthe_data *dev_data;
+ int ret;
+
+ dev_data = devm_kzalloc(dev, sizeof(*dev_data), GFP_KERNEL);
+ if (!dev_data)
+ return -ENOMEM;
+
+ dev_data->dev = dev;
+ dev_data->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(dev_data->regs))
+ return PTR_ERR(dev_data->regs);
+
+ platform_set_drvdata(pdev, dev_data);
+
+ spin_lock(&dthe_dev_list.lock);
+ list_add(&dev_data->list, &dthe_dev_list.dev_list);
+ spin_unlock(&dthe_dev_list.lock);
+
+ mutex_init(&dev_data->aes_mutex);
+
+ ret = dthe_dma_init(dev_data);
+ if (ret)
+ goto probe_dma_err;
+
+ ret = dthe_register_algs();
+ if (ret) {
+ dev_err(dev, "Failed to register algs\n");
+ goto probe_reg_err;
+ }
+
+ return 0;
+
+probe_reg_err:
+ dma_release_channel(dev_data->dma_aes_rx);
+ dma_release_channel(dev_data->dma_aes_tx);
+ dma_release_channel(dev_data->dma_sha_tx);
+probe_dma_err:
+ spin_lock(&dthe_dev_list.lock);
+ list_del(&dev_data->list);
+ spin_unlock(&dthe_dev_list.lock);
+
+ mutex_destroy(&dev_data->aes_mutex);
+
+ return ret;
+}
+
+static void dthe_remove(struct platform_device *pdev)
+{
+ struct dthe_data *dev_data = platform_get_drvdata(pdev);
+
+ spin_lock(&dthe_dev_list.lock);
+ list_del(&dev_data->list);
+ spin_unlock(&dthe_dev_list.lock);
+
+ mutex_destroy(&dev_data->aes_mutex);
+
+ dthe_unregister_algs();
+
+ dma_release_channel(dev_data->dma_aes_rx);
+ dma_release_channel(dev_data->dma_aes_tx);
+ dma_release_channel(dev_data->dma_sha_tx);
+}
+
+static const struct of_device_id dthe_of_match[] = {
+ { .compatible = "ti,am62l-dthev2", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, dthe_of_match);
+
+static struct platform_driver dthe_driver = {
+ .probe = dthe_probe,
+ .remove = dthe_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = dthe_of_match,
+ },
+};
+
+module_platform_driver(dthe_driver);
+
+MODULE_AUTHOR("T Pratham <t-pratham@ti.com>");
+MODULE_DESCRIPTION("Texas Instruments DTHE V2 driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/crypto/ti/dthev2-common.h b/drivers/crypto/ti/dthev2-common.h
new file mode 100644
index 000000000000..6bd7cd1f608e
--- /dev/null
+++ b/drivers/crypto/ti/dthev2-common.h
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * K3 DTHE V2 crypto accelerator driver
+ *
+ * Copyright (C) Texas Instruments 2025 - https://www.ti.com
+ * Author: T Pratham <t-pratham@ti.com>
+ */
+
+#ifndef __TI_DTHEV2_H__
+#define __TI_DTHE2V_H__
+
+#include <crypto/aead.h>
+#include <crypto/aes.h>
+#include <crypto/algapi.h>
+#include <crypto/hash.h>
+#include <crypto/internal/aead.h>
+#include <crypto/internal/hash.h>
+#include <crypto/internal/skcipher.h>
+
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/dmapool.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/scatterlist.h>
+
+#define DTHE_REG_SIZE 4
+#define DTHE_DMA_TIMEOUT_MS 2000
+
+enum dthe_aes_mode {
+ DTHE_AES_ECB = 0,
+ DTHE_AES_CBC,
+};
+
+/* Driver specific struct definitions */
+
+struct dthe_tfm_ctx;
+
+/**
+ * struct dthe_data - DTHE_V2 driver instance data
+ * @dev: Device pointer
+ * @regs: Base address of the register space
+ * @list: list node for dev
+ * @dma_aes_rx: AES Rx DMA Channel
+ * @dma_aes_tx: AES Tx DMA Channel
+ * @dma_sha_tx: SHA Tx DMA Channel
+ * @aes_mutex: Mutex protecting access to AES engine
+ * @ctx: Transform context struct
+ */
+struct dthe_data {
+ struct device *dev;
+ void __iomem *regs;
+ struct list_head list;
+
+ struct dma_chan *dma_aes_rx;
+ struct dma_chan *dma_aes_tx;
+
+ struct dma_chan *dma_sha_tx;
+
+ struct mutex aes_mutex;
+
+ struct dthe_tfm_ctx *ctx;
+};
+
+/**
+ * struct dthe_list - device data list head
+ * @dev_list: linked list head
+ * @lock: Spinlock protecting accesses to the list
+ */
+struct dthe_list {
+ struct list_head dev_list;
+ spinlock_t lock;
+};
+
+/**
+ * struct dthe_aes_ctx - AES engine ctx struct
+ * @mode: AES mode
+ * @keylen: AES key length
+ * @key: AES key
+ * @enc: flag indicating encryption or decryption operation
+ * @aes_compl: Completion variable for use in manual completion in case of DMA callback failure
+ */
+struct dthe_aes_ctx {
+ enum dthe_aes_mode mode;
+ unsigned int keylen;
+ u32 key[AES_KEYSIZE_256 / sizeof(u32)];
+ int enc;
+ struct completion aes_compl;
+};
+
+/**
+ * struct dthe_tfm_ctx - Transform ctx struct containing ctx for all sub-components of DTHE V2
+ * @dev_data: Device data struct pointer
+ * @ctx_info: Union of ctx structs of various sub-components of DTHE_V2
+ */
+struct dthe_tfm_ctx {
+ struct dthe_data *dev_data;
+ union {
+ struct dthe_aes_ctx *aes_ctx;
+ } ctx_info;
+};
+
+/* Struct definitions end */
+
+struct dthe_data *dthe_get_dev(struct dthe_tfm_ctx *ctx);
+
+int dthe_register_aes_algs(void);
+void dthe_unregister_aes_algs(void);
+
+#endif
--
2.34.1
^ permalink raw reply [flat|nested] 6+ messages in thread