blob: 20c817f1cf90307a94eec16d866a91a7b48ff755 [file] [log] [blame]
/*
* Copyright (c) 2022 Nuvoton Technology Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nuvoton_npcx_sha
#include <errno.h>
#include <zephyr/kernel.h>
#include <zephyr/crypto/crypto.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(sha_npcx, CONFIG_CRYPTO_LOG_LEVEL);
#include "soc_ncl.h"
#define NPCX_HASH_CAPS_SUPPORT (CAP_SEPARATE_IO_BUFS | CAP_SYNC_OPS)
#define NPCX_SHA256_HANDLE_SIZE DT_INST_PROP(0, context_buffer_size)
#define NPCX_SHA_MAX_SESSION 1
/* The following table holds the function pointer for each SHA API in NPCX ROM. */
struct npcx_ncl_sha {
/* Get the SHA context size required by SHA APIs. */
uint32_t (*get_context_size)(void);
/* Initial SHA context. */
enum ncl_status (*init_context)(void *ctx);
/* Finalize SHA context. */
enum ncl_status (*finalize_context)(void *ctx);
/* Initiate the SHA hardware module and setups needed parameters. */
enum ncl_status (*init)(void *ctx);
/*
* Prepare the context buffer for a SHA calculation - by loading the
* initial SHA-256/384/512 parameters.
*/
enum ncl_status (*start)(void *ctx, enum ncl_sha_type type);
/*
* Updates the SHA calculation with the additional data. When the
* function returns, the hardware and memory buffer shall be ready to
* accept new data * buffers for SHA calculation and changes to the data
* in data buffer should no longer effect the SHA calculation.
*/
enum ncl_status (*update)(void *ctx, const uint8_t *data, uint32_t Len);
/* Return the SHA result (digest.) */
enum ncl_status (*finish)(void *ctx, uint8_t *hashDigest);
/* Perform a complete SHA calculation */
enum ncl_status (*calc)(void *ctx, enum ncl_sha_type type, const uint8_t *data,
uint32_t Len, uint8_t *hashDigest);
/* Power on/off the SHA module. */
enum ncl_status (*power)(void *ctx, uint8_t enable);
/* Reset the SHA hardware and terminate any in-progress operations. */
enum ncl_status (*reset)(void *ctx);
};
/* The start address of the SHA API table. */
#define NPCX_NCL_SHA ((const struct npcx_ncl_sha *)DT_INST_REG_ADDR(0))
struct npcx_sha_context {
uint8_t handle[NPCX_SHA256_HANDLE_SIZE];
} __aligned(4);
struct npcx_sha_session {
struct npcx_sha_context npcx_sha_ctx;
enum hash_algo algo;
bool in_use;
};
struct npcx_sha_session npcx_sessions[NPCX_SHA_MAX_SESSION];
static int npcx_get_unused_session_index(void)
{
int i;
for (i = 0; i < NPCX_SHA_MAX_SESSION; i++) {
if (!npcx_sessions[i].in_use) {
npcx_sessions[i].in_use = true;
return i;
}
}
return -1;
}
static int npcx_sha_compute(struct hash_ctx *ctx, struct hash_pkt *pkt, bool finish)
{
enum ncl_status ret;
struct npcx_sha_session *npcx_session = ctx->drv_sessn_state;
struct npcx_sha_context *npcx_ctx = &npcx_session->npcx_sha_ctx;
enum ncl_sha_type sha_type;
switch (npcx_session->algo) {
case CRYPTO_HASH_ALGO_SHA256:
sha_type = NCL_SHA_TYPE_2_256;
break;
case CRYPTO_HASH_ALGO_SHA384:
sha_type = NCL_SHA_TYPE_2_384;
break;
case CRYPTO_HASH_ALGO_SHA512:
sha_type = NCL_SHA_TYPE_2_512;
break;
default:
LOG_ERR("Unexpected algo: %d", npcx_session->algo);
return -EINVAL;
}
if (!ctx->started) {
ret = NPCX_NCL_SHA->start(npcx_ctx->handle, sha_type);
if (ret != NCL_STATUS_OK) {
LOG_ERR("Could not compute the hash, err:%d", ret);
return -EINVAL;
}
ctx->started = true;
}
if (pkt->in_len != 0) {
ret = NPCX_NCL_SHA->update(npcx_ctx->handle, pkt->in_buf, pkt->in_len);
if (ret != NCL_STATUS_OK) {
LOG_ERR("Could not update the hash, err:%d", ret);
ctx->started = false;
return -EINVAL;
}
}
if (finish) {
ctx->started = false;
ret = NPCX_NCL_SHA->finish(npcx_ctx->handle, pkt->out_buf);
if (ret != NCL_STATUS_OK) {
LOG_ERR("Could not compute the hash, err:%d", ret);
return -EINVAL;
}
}
return 0;
}
static int npcx_hash_session_setup(const struct device *dev, struct hash_ctx *ctx,
enum hash_algo algo)
{
int ctx_idx;
struct npcx_sha_context *npcx_ctx;
if (ctx->flags & ~(NPCX_HASH_CAPS_SUPPORT)) {
LOG_ERR("Unsupported flag");
return -EINVAL;
}
if ((algo != CRYPTO_HASH_ALGO_SHA256) && (algo != CRYPTO_HASH_ALGO_SHA384) &&
(algo != CRYPTO_HASH_ALGO_SHA512)) {
LOG_ERR("Unsupported algo: %d", algo);
return -EINVAL;
}
ctx_idx = npcx_get_unused_session_index();
if (ctx_idx < 0) {
LOG_ERR("No free session for now");
return -ENOSPC;
}
npcx_sessions[ctx_idx].algo = algo;
ctx->drv_sessn_state = &npcx_sessions[ctx_idx];
ctx->started = false;
ctx->hash_hndlr = npcx_sha_compute;
npcx_ctx = &npcx_sessions[ctx_idx].npcx_sha_ctx;
NPCX_NCL_SHA->init_context(npcx_ctx->handle);
NPCX_NCL_SHA->power(npcx_ctx->handle, 1);
NPCX_NCL_SHA->init(npcx_ctx->handle);
NPCX_NCL_SHA->reset(npcx_ctx->handle);
return 0;
}
static int npcx_hash_session_free(const struct device *dev, struct hash_ctx *ctx)
{
struct npcx_sha_session *npcx_session = ctx->drv_sessn_state;
struct npcx_sha_context *npcx_ctx = &npcx_session->npcx_sha_ctx;
NPCX_NCL_SHA->reset(npcx_ctx->handle);
NPCX_NCL_SHA->power(npcx_ctx->handle, 0);
NPCX_NCL_SHA->finalize_context(npcx_ctx->handle);
npcx_session->in_use = false;
return 0;
}
static int npcx_query_caps(const struct device *dev)
{
return NPCX_HASH_CAPS_SUPPORT;
}
static int npcx_hash_init(const struct device *dev)
{
uint32_t handle_size_required;
handle_size_required = NPCX_NCL_SHA->get_context_size();
if (handle_size_required != NPCX_SHA256_HANDLE_SIZE) {
LOG_ERR("Pre-alloc buf size doesn't match required buf size (%d)",
handle_size_required);
return -ENOSR;
}
return 0;
}
static const struct crypto_driver_api npcx_crypto_api = {
.hash_begin_session = npcx_hash_session_setup,
.hash_free_session = npcx_hash_session_free,
.query_hw_caps = npcx_query_caps,
};
DEVICE_DT_INST_DEFINE(0, npcx_hash_init, NULL, NULL, NULL, POST_KERNEL, CONFIG_CRYPTO_INIT_PRIORITY,
&npcx_crypto_api);
BUILD_ASSERT(DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT) == 1,
"only one 'nuvoton,npcx-sha' compatible node can be supported");