1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Advanced Crypto Engine - SHA Firmware
4 * Copyright (c) 2012 Samsung Electronics
5 */
6 #include <common.h>
7 #include "ace_sha.h"
8 #include <log.h>
9 #include <rand.h>
10
11 #ifdef CONFIG_SHA_HW_ACCEL
12 #include <u-boot/sha256.h>
13 #include <u-boot/sha1.h>
14 #include <linux/errno.h>
15
16 /* SHA1 value for the message of zero length */
17 static const unsigned char sha1_digest_emptymsg[SHA1_SUM_LEN] = {
18 0xDA, 0x39, 0xA3, 0xEE, 0x5E, 0x6B, 0x4B, 0x0D,
19 0x32, 0x55, 0xBF, 0xFF, 0x95, 0x60, 0x18, 0x90,
20 0xAF, 0xD8, 0x07, 0x09};
21
22 /* SHA256 value for the message of zero length */
23 static const unsigned char sha256_digest_emptymsg[SHA256_SUM_LEN] = {
24 0xE3, 0xB0, 0xC4, 0x42, 0x98, 0xFC, 0x1C, 0x14,
25 0x9A, 0xFB, 0xF4, 0xC8, 0x99, 0x6F, 0xB9, 0x24,
26 0x27, 0xAE, 0x41, 0xE4, 0x64, 0x9B, 0x93, 0x4C,
27 0xA4, 0x95, 0x99, 0x1B, 0x78, 0x52, 0xB8, 0x55};
28
ace_sha_hash_digest(const unsigned char * pbuf,unsigned int buf_len,unsigned char * pout,unsigned int hash_type)29 int ace_sha_hash_digest(const unsigned char *pbuf, unsigned int buf_len,
30 unsigned char *pout, unsigned int hash_type)
31 {
32 unsigned int i, reg, len;
33 unsigned int *pdigest;
34 struct exynos_ace_sfr *ace_sha_reg =
35 (struct exynos_ace_sfr *)samsung_get_base_ace_sfr();
36
37 if (buf_len == 0) {
38 /* ACE H/W cannot compute hash value for empty string */
39 if (hash_type == ACE_SHA_TYPE_SHA1)
40 memcpy(pout, sha1_digest_emptymsg, SHA1_SUM_LEN);
41 else
42 memcpy(pout, sha256_digest_emptymsg, SHA256_SUM_LEN);
43 return 0;
44 }
45
46 /* Flush HRDMA */
47 writel(ACE_FC_HRDMACFLUSH_ON, &ace_sha_reg->fc_hrdmac);
48 writel(ACE_FC_HRDMACFLUSH_OFF, &ace_sha_reg->fc_hrdmac);
49
50 /* Set byte swap of data in */
51 writel(ACE_HASH_SWAPDI_ON | ACE_HASH_SWAPDO_ON | ACE_HASH_SWAPIV_ON,
52 &ace_sha_reg->hash_byteswap);
53
54 /* Select Hash input mux as external source */
55 reg = readl(&ace_sha_reg->fc_fifoctrl);
56 reg = (reg & ~ACE_FC_SELHASH_MASK) | ACE_FC_SELHASH_EXOUT;
57 writel(reg, &ace_sha_reg->fc_fifoctrl);
58
59 /* Set Hash as SHA1 or SHA256 and start Hash engine */
60 reg = (hash_type == ACE_SHA_TYPE_SHA1) ?
61 ACE_HASH_ENGSEL_SHA1HASH : ACE_HASH_ENGSEL_SHA256HASH;
62 reg |= ACE_HASH_STARTBIT_ON;
63 writel(reg, &ace_sha_reg->hash_control);
64
65 /* Enable FIFO mode */
66 writel(ACE_HASH_FIFO_ON, &ace_sha_reg->hash_fifo_mode);
67
68 /* Set message length */
69 writel(buf_len, &ace_sha_reg->hash_msgsize_low);
70 writel(0, &ace_sha_reg->hash_msgsize_high);
71
72 /* Set HRDMA */
73 writel((unsigned int)pbuf, &ace_sha_reg->fc_hrdmas);
74 writel(buf_len, &ace_sha_reg->fc_hrdmal);
75
76 while ((readl(&ace_sha_reg->hash_status) & ACE_HASH_MSGDONE_MASK) ==
77 ACE_HASH_MSGDONE_OFF) {
78 /*
79 * PRNG error bit goes HIGH if a PRNG request occurs without
80 * a complete seed setup. We are using this bit to check h/w
81 * fault because proper setup is not expected in that case.
82 */
83 if ((readl(&ace_sha_reg->hash_status)
84 & ACE_HASH_PRNGERROR_MASK) == ACE_HASH_PRNGERROR_ON)
85 return -EBUSY;
86 }
87
88 /* Clear MSG_DONE bit */
89 writel(ACE_HASH_MSGDONE_ON, &ace_sha_reg->hash_status);
90
91 /* Read hash result */
92 pdigest = (unsigned int *)pout;
93 len = (hash_type == ACE_SHA_TYPE_SHA1) ? SHA1_SUM_LEN : SHA256_SUM_LEN;
94
95 for (i = 0; i < len / 4; i++)
96 pdigest[i] = readl(&ace_sha_reg->hash_result[i]);
97
98 /* Clear HRDMA pending bit */
99 writel(ACE_FC_HRDMA, &ace_sha_reg->fc_intpend);
100
101 return 0;
102 }
103
hw_sha256(const unsigned char * pbuf,unsigned int buf_len,unsigned char * pout,unsigned int chunk_size)104 void hw_sha256(const unsigned char *pbuf, unsigned int buf_len,
105 unsigned char *pout, unsigned int chunk_size)
106 {
107 if (ace_sha_hash_digest(pbuf, buf_len, pout, ACE_SHA_TYPE_SHA256))
108 debug("ACE was not setup properly or it is faulty\n");
109 }
110
hw_sha1(const unsigned char * pbuf,unsigned int buf_len,unsigned char * pout,unsigned int chunk_size)111 void hw_sha1(const unsigned char *pbuf, unsigned int buf_len,
112 unsigned char *pout, unsigned int chunk_size)
113 {
114 if (ace_sha_hash_digest(pbuf, buf_len, pout, ACE_SHA_TYPE_SHA1))
115 debug("ACE was not setup properly or it is faulty\n");
116 }
117 #endif /* CONFIG_SHA_HW_ACCEL */
118
119 #ifdef CONFIG_LIB_HW_RAND
120 static unsigned int seed_done;
121
srand(unsigned int seed)122 void srand(unsigned int seed)
123 {
124 struct exynos_ace_sfr *reg =
125 (struct exynos_ace_sfr *)samsung_get_base_ace_sfr();
126 int i, status;
127
128 /* Seed data */
129 for (i = 0; i < ACE_HASH_PRNG_REG_NUM; i++)
130 writel(seed << i, ®->hash_seed[i]);
131
132 /* Wait for seed setup done */
133 while (1) {
134 status = readl(®->hash_status);
135 if ((status & ACE_HASH_SEEDSETTING_MASK) ||
136 (status & ACE_HASH_PRNGERROR_MASK))
137 break;
138 }
139
140 seed_done = 1;
141 }
142
rand(void)143 unsigned int rand(void)
144 {
145 struct exynos_ace_sfr *reg =
146 (struct exynos_ace_sfr *)samsung_get_base_ace_sfr();
147 int i, status;
148 unsigned int seed = (unsigned int)&status;
149 unsigned int ret = 0;
150
151 if (!seed_done)
152 srand(seed);
153
154 /* Start PRNG */
155 writel(ACE_HASH_ENGSEL_PRNG | ACE_HASH_STARTBIT_ON, ®->hash_control);
156
157 /* Wait for PRNG done */
158 while (1) {
159 status = readl(®->hash_status);
160 if (status & ACE_HASH_PRNGDONE_MASK)
161 break;
162 if (status & ACE_HASH_PRNGERROR_MASK) {
163 seed_done = 0;
164 return 0;
165 }
166 }
167
168 /* Clear Done IRQ */
169 writel(ACE_HASH_PRNGDONE_MASK, ®->hash_status);
170
171 /* Read a PRNG result */
172 for (i = 0; i < ACE_HASH_PRNG_REG_NUM; i++)
173 ret += readl(®->hash_prng[i]);
174
175 seed_done = 0;
176 return ret;
177 }
178
rand_r(unsigned int * seedp)179 unsigned int rand_r(unsigned int *seedp)
180 {
181 srand(*seedp);
182
183 return rand();
184 }
185 #endif /* CONFIG_LIB_HW_RAND */
186