/*
 * Copyright 2014 Freescale Semiconductor, Inc.
 *
 * SPDX-License-Identifier:     GPL-2.0+
 *
 */

#include <common.h>
#include <malloc.h>
#include "jobdesc.h"
#include "desc.h"
#include "jr.h"
#include "fsl_hash.h"
#include <hw_sha.h>
#include <linux/errno.h>

#define CRYPTO_MAX_ALG_NAME     80
#define SHA1_DIGEST_SIZE        20
#define SHA256_DIGEST_SIZE      32

struct caam_hash_template {
        char name[CRYPTO_MAX_ALG_NAME];
        unsigned int digestsize;
        u32 alg_type;
};

enum caam_hash_algos {
        SHA1 = 0,
        SHA256
};

static struct caam_hash_template driver_hash[] = {
        {
                .name = "sha1",
                .digestsize = SHA1_DIGEST_SIZE,
                .alg_type = OP_ALG_ALGSEL_SHA1,
        },
        {
                .name = "sha256",
                .digestsize = SHA256_DIGEST_SIZE,
                .alg_type = OP_ALG_ALGSEL_SHA256,
        },
};

static enum caam_hash_algos get_hash_type(struct hash_algo *algo)
{
        if (!strcmp(algo->name, driver_hash[SHA1].name))
                return SHA1;
        else
                return SHA256;
}

/* Create the context for progressive hashing using h/w acceleration.
 *
 * @ctxp: Pointer to the pointer of the context for hashing
 * @caam_algo: Enum for SHA1 or SHA256
 * @return 0 if ok, -ENOMEM on error
 */
static int caam_hash_init(void **ctxp, enum caam_hash_algos caam_algo)
{
        *ctxp = calloc(1, sizeof(struct sha_ctx));
        if (*ctxp == NULL) {
                debug("Cannot allocate memory for context\n");
                return -ENOMEM;
        }
        return 0;
}

/*
 * Update sg table for progressive hashing using h/w acceleration
 *
 * The context is freed by this function if an error occurs.
 * We support at most 32 Scatter/Gather Entries.
 *
 * @hash_ctx: Pointer to the context for hashing
 * @buf: Pointer to the buffer being hashed
 * @size: Size of the buffer being hashed
 * @is_last: 1 if this is the last update; 0 otherwise
 * @caam_algo: Enum for SHA1 or SHA256
 * @return 0 if ok, -EINVAL on error
 */
static int caam_hash_update(void *hash_ctx, const void *buf,
                            unsigned int size, int is_last,
                            enum caam_hash_algos caam_algo)
{
        uint32_t final = 0;
        phys_addr_t addr = virt_to_phys((void *)buf);
        struct sha_ctx *ctx = hash_ctx;

        if (ctx->sg_num >= MAX_SG_32) {
                free(ctx);
                return -EINVAL;
        }

#ifdef CONFIG_PHYS_64BIT
        sec_out32(&ctx->sg_tbl[ctx->sg_num].addr_hi, (uint32_t)(addr >> 32));
#else
        sec_out32(&ctx->sg_tbl[ctx->sg_num].addr_hi, 0x0);
#endif
        sec_out32(&ctx->sg_tbl[ctx->sg_num].addr_lo, (uint32_t)addr);

        sec_out32(&ctx->sg_tbl[ctx->sg_num].len_flag,
                  (size & SG_ENTRY_LENGTH_MASK));

        ctx->sg_num++;

        if (is_last) {
                final = sec_in32(&ctx->sg_tbl[ctx->sg_num - 1].len_flag) |
                        SG_ENTRY_FINAL_BIT;
                sec_out32(&ctx->sg_tbl[ctx->sg_num - 1].len_flag, final);
        }

        return 0;
}

/*
 * Perform progressive hashing on the given buffer and copy hash at
 * destination buffer
 *
 * The context is freed after completion of hash operation.
 *
 * @hash_ctx: Pointer to the context for hashing
 * @dest_buf: Pointer to the destination buffer where hash is to be copied
 * @size: Size of the buffer being hashed
 * @caam_algo: Enum for SHA1 or SHA256
 * @return 0 if ok, -EINVAL on error
 */
static int caam_hash_finish(void *hash_ctx, void *dest_buf,
                            int size, enum caam_hash_algos caam_algo)
{
        uint32_t len = 0;
        struct sha_ctx *ctx = hash_ctx;
        int i = 0, ret = 0;

        if (size < driver_hash[caam_algo].digestsize) {
                free(ctx);
                return -EINVAL;
        }

        for (i = 0; i < ctx->sg_num; i++)
                len += (sec_in32(&ctx->sg_tbl[i].len_flag) &
                        SG_ENTRY_LENGTH_MASK);

        inline_cnstr_jobdesc_hash(ctx->sha_desc, (uint8_t *)ctx->sg_tbl, len,
                                  ctx->hash,
                                  driver_hash[caam_algo].alg_type,
                                  driver_hash[caam_algo].digestsize,
                                  1);

        ret = run_descriptor_jr(ctx->sha_desc);

        if (ret)
                debug("Error %x\n", ret);
        else
                memcpy(dest_buf, ctx->hash, sizeof(ctx->hash));

        free(ctx);
        return ret;
}

int caam_hash(const unsigned char *pbuf, unsigned int buf_len,
              unsigned char *pout, enum caam_hash_algos algo)
{
        int ret = 0;
        uint32_t *desc;

        desc = malloc(sizeof(int) * MAX_CAAM_DESCSIZE);
        if (!desc) {
                debug("Not enough memory for descriptor allocation\n");
                return -ENOMEM;
        }

        inline_cnstr_jobdesc_hash(desc, pbuf, buf_len, pout,
                                  driver_hash[algo].alg_type,
                                  driver_hash[algo].digestsize,
                                  0);

        ret = run_descriptor_jr(desc);

        free(desc);
        return ret;
}

void hw_sha256(const unsigned char *pbuf, unsigned int buf_len,
                        unsigned char *pout, unsigned int chunk_size)
{
        if (caam_hash(pbuf, buf_len, pout, SHA256))
                printf("CAAM was not setup properly or it is faulty\n");
}

void hw_sha1(const unsigned char *pbuf, unsigned int buf_len,
                        unsigned char *pout, unsigned int chunk_size)
{
        if (caam_hash(pbuf, buf_len, pout, SHA1))
                printf("CAAM was not setup properly or it is faulty\n");
}

int hw_sha_init(struct hash_algo *algo, void **ctxp)
{
        return caam_hash_init(ctxp, get_hash_type(algo));
}

int hw_sha_update(struct hash_algo *algo, void *ctx, const void *buf,
                            unsigned int size, int is_last)
{
        return caam_hash_update(ctx, buf, size, is_last, get_hash_type(algo));
}

int hw_sha_finish(struct hash_algo *algo, void *ctx, void *dest_buf,
                     int size)
{
        return caam_hash_finish(ctx, dest_buf, size, get_hash_type(algo));
}