summaryrefslogtreecommitdiff
path: root/src/soc/rockchip/rk3288/crypto.c
blob: b8a138002f1620d62fd64c1d58a73d5b224af889 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/*
 * 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;
}