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/*
* This file is part of the coreboot project.
*
* Copyright 2014 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#include <arch/io.h>
#include <assert.h>
#include <delay.h>
#include <soc/addressmap.h>
#include <soc/soc.h>
#include <types.h>
#include <vb2_api.h>
enum rk3288_crypto_interrupt_bits {
PKA_DONE = 1 << 5,
HASH_DONE = 1 << 4,
HRDMA_ERR = 1 << 3,
HRDMA_DONE = 1 << 2,
BCDMA_ERR = 1 << 1,
BCDMA_DONE = 1 << 0,
};
struct rk3288_crypto {
u32 intsts;
u32 intena;
u32 ctrl;
u32 conf;
u32 brdmas;
u32 btdmas;
u32 btdmal;
u32 hrdmas;
u32 hrdmal;
u8 _res0[0x80 - 0x24];
u32 aes_ctrl;
u32 aes_sts;
u32 aes_din[4];
u32 aes_dout[4];
u32 aes_iv[4];
u32 aes_key[8];
u32 aes_cnt[4];
u8 _res1[0x100 - 0xe8];
u32 tdes_ctrl;
u32 tdes_sts;
u32 tdes_din[2];
u32 tdes_dout[2];
u32 tdes_iv[2];
u32 tdes_key[3][2];
u8 _res2[0x180 - 0x138];
u32 hash_ctrl;
u32 hash_sts;
u32 hash_msg_len;
u32 hash_dout[8];
u32 hash_seed[5];
u8 _res3[0x200 - 0x1c0];
u32 trng_ctrl;
u32 trng_dout[8];
} *crypto = (void *)CRYPTO_BASE;
check_member(rk3288_crypto, trng_dout[7], 0x220);
int vb2ex_hwcrypto_digest_init(enum vb2_hash_algorithm hash_alg,
uint32_t data_size)
{
if (hash_alg != VB2_HASH_SHA256) {
printk(BIOS_INFO, "RK3288 doesn't support hash_alg %d!\n",
hash_alg);
return VB2_ERROR_EX_HWCRYPTO_UNSUPPORTED;
}
write32(&crypto->ctrl, RK_SETBITS(1 << 6)); /* Assert HASH_FLUSH */
udelay(1); /* for 10+ cycles to */
write32(&crypto->ctrl, RK_CLRBITS(1 << 6)); /* clear out old hash */
/* Enable DMA byte swapping for little-endian bus (Byteswap_??FIFO) */
write32(&crypto->conf, 1 << 5 | 1 << 4 | 1 << 3);
write32(&crypto->intena, HRDMA_ERR | HRDMA_DONE); /* enable interrupt */
write32(&crypto->hash_msg_len, data_size); /* program total size */
write32(&crypto->hash_ctrl, 1 << 3 | 0x2); /* swap DOUT, SHA256 */
printk(BIOS_DEBUG, "Initialized RK3288 HW crypto for %u byte SHA256\n",
data_size);
return VB2_SUCCESS;
}
int vb2ex_hwcrypto_digest_extend(const uint8_t *buf, uint32_t size)
{
uint32_t intsts;
write32(&crypto->intsts, HRDMA_ERR | HRDMA_DONE); /* clear interrupts */
/* NOTE: This assumes that the DMA is reading from uncached SRAM. */
write32(&crypto->hrdmas, (uint32_t)buf);
write32(&crypto->hrdmal, size / sizeof(uint32_t));
write32(&crypto->ctrl, RK_SETBITS(1 << 3)); /* Set HASH_START */
do {
intsts = read32(&crypto->intsts);
if (intsts & HRDMA_ERR) {
printk(BIOS_ERR, "ERROR: DMA error during HW crypto\n");
return VB2_ERROR_UNKNOWN;
}
} while (!(intsts & HRDMA_DONE)); /* wait for DMA to finish */
return VB2_SUCCESS;
}
int vb2ex_hwcrypto_digest_finalize(uint8_t *digest, uint32_t digest_size)
{
uint32_t *dest = (uint32_t *)digest;
uint32_t *src = crypto->hash_dout;
assert(digest_size == sizeof(crypto->hash_dout));
while (!(read32(&crypto->hash_sts) & 0x1))
/* wait for crypto engine to set HASH_DONE bit */;
while ((uint8_t *)dest < digest + digest_size)
*dest++ = read32(src++);
return VB2_SUCCESS;
}
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