1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright 2016 Broadcom
4  */
5 
6 /*
7  * This file contains SPU message definitions specific to SPU-M.
8  */
9 
10 #ifndef _SPUM_H_
11 #define _SPUM_H_
12 
13 #define SPU_CRYPTO_OPERATION_GENERIC	0x1
14 
15 /* Length of STATUS field in tx and rx packets */
16 #define SPU_TX_STATUS_LEN  4
17 
18 /* SPU-M error codes */
19 #define SPU_STATUS_MASK                 0x0000FF00
20 #define SPU_STATUS_SUCCESS              0x00000000
21 #define SPU_STATUS_INVALID_ICV          0x00000100
22 
23 #define SPU_STATUS_ERROR_FLAG           0x00020000
24 
25 /* Request message. MH + EMH + BDESC + BD header */
26 #define SPU_REQ_FIXED_LEN 24
27 
28 /*
29  * Max length of a SPU message header. Used to allocate a buffer where
30  * the SPU message header is constructed. Can be used for either a SPU-M
31  * header or a SPU2 header.
32  * For SPU-M, sum of the following:
33  *    MH - 4 bytes
34  *    EMH - 4
35  *    SCTX - 3 +
36  *      max auth key len - 64
37  *      max cipher key len - 264 (RC4)
38  *      max IV len - 16
39  *    BDESC - 12
40  *    BD header - 4
41  * Total:  371
42  *
43  * For SPU2, FMD_SIZE (32) plus lengths of hash and cipher keys,
44  * hash and cipher IVs. If SPU2 does not support RC4, then
45  */
46 #define SPU_HEADER_ALLOC_LEN  (SPU_REQ_FIXED_LEN + MAX_KEY_SIZE + \
47 				MAX_KEY_SIZE + MAX_IV_SIZE)
48 
49 /*
50  * Response message header length. Normally MH, EMH, BD header, but when
51  * BD_SUPPRESS is used for hash requests, there is no BD header.
52  */
53 #define SPU_RESP_HDR_LEN 12
54 #define SPU_HASH_RESP_HDR_LEN 8
55 
56 /*
57  * Max value that can be represented in the Payload Length field of the BD
58  * header. This is a 16-bit field.
59  */
60 #define SPUM_NS2_MAX_PAYLOAD  (BIT(16) - 1)
61 
62 /*
63  * NSP SPU is limited to ~9KB because of FA2 FIFO size limitations;
64  * Set MAX_PAYLOAD to 8k to allow for addition of header, digest, etc.
65  * and stay within limitation.
66  */
67 
68 #define SPUM_NSP_MAX_PAYLOAD	8192
69 
70 /* Buffer Descriptor Header [BDESC]. SPU in big-endian mode. */
71 struct BDESC_HEADER {
72 	__be16 offset_mac;		/* word 0 [31-16] */
73 	__be16 length_mac;		/* word 0 [15-0]  */
74 	__be16 offset_crypto;		/* word 1 [31-16] */
75 	__be16 length_crypto;		/* word 1 [15-0]  */
76 	__be16 offset_icv;		/* word 2 [31-16] */
77 	__be16 offset_iv;		/* word 2 [15-0]  */
78 };
79 
80 /* Buffer Data Header [BD]. SPU in big-endian mode. */
81 struct BD_HEADER {
82 	__be16 size;
83 	__be16 prev_length;
84 };
85 
86 /* Command Context Header. SPU-M in big endian mode. */
87 struct MHEADER {
88 	u8 flags;	/* [31:24] */
89 	u8 op_code;	/* [23:16] */
90 	u16 reserved;	/* [15:0] */
91 };
92 
93 /* MH header flags bits */
94 #define MH_SUPDT_PRES   BIT(0)
95 #define MH_HASH_PRES    BIT(2)
96 #define MH_BD_PRES      BIT(3)
97 #define MH_MFM_PRES     BIT(4)
98 #define MH_BDESC_PRES   BIT(5)
99 #define MH_SCTX_PRES	BIT(7)
100 
101 /* SCTX word 0 bit offsets and fields masks */
102 #define SCTX_SIZE               0x000000FF
103 
104 /* SCTX word 1 bit shifts and field masks */
105 #define  UPDT_OFST              0x000000FF   /* offset of SCTX updateable fld */
106 #define  HASH_TYPE              0x00000300   /* hash alg operation type */
107 #define  HASH_TYPE_SHIFT                 8
108 #define  HASH_MODE              0x00001C00   /* one of spu2_hash_mode */
109 #define  HASH_MODE_SHIFT                10
110 #define  HASH_ALG               0x0000E000   /* hash algorithm */
111 #define  HASH_ALG_SHIFT                 13
112 #define  CIPHER_TYPE            0x00030000   /* encryption operation type */
113 #define  CIPHER_TYPE_SHIFT              16
114 #define  CIPHER_MODE            0x001C0000   /* encryption mode */
115 #define  CIPHER_MODE_SHIFT              18
116 #define  CIPHER_ALG             0x00E00000   /* encryption algo */
117 #define  CIPHER_ALG_SHIFT               21
118 #define  ICV_IS_512                BIT(27)
119 #define  ICV_IS_512_SHIFT		27
120 #define  CIPHER_ORDER               BIT(30)
121 #define  CIPHER_ORDER_SHIFT             30
122 #define  CIPHER_INBOUND             BIT(31)
123 #define  CIPHER_INBOUND_SHIFT           31
124 
125 /* SCTX word 2 bit shifts and field masks */
126 #define  EXP_IV_SIZE                   0x7
127 #define  IV_OFFSET                   BIT(3)
128 #define  IV_OFFSET_SHIFT                 3
129 #define  GEN_IV                      BIT(5)
130 #define  GEN_IV_SHIFT                    5
131 #define  EXPLICIT_IV                 BIT(6)
132 #define  EXPLICIT_IV_SHIFT               6
133 #define  SCTX_IV                     BIT(7)
134 #define  SCTX_IV_SHIFT                   7
135 #define  ICV_SIZE                   0x0F00
136 #define  ICV_SIZE_SHIFT                  8
137 #define  CHECK_ICV                  BIT(12)
138 #define  CHECK_ICV_SHIFT                12
139 #define  INSERT_ICV                 BIT(13)
140 #define  INSERT_ICV_SHIFT               13
141 #define  BD_SUPPRESS                BIT(19)
142 #define  BD_SUPPRESS_SHIFT              19
143 
144 /* Generic Mode Security Context Structure [SCTX] */
145 struct SCTX {
146 /* word 0: protocol flags */
147 	__be32 proto_flags;
148 
149 /* word 1: cipher flags */
150 	__be32 cipher_flags;
151 
152 /* word 2: Extended cipher flags */
153 	__be32 ecf;
154 
155 };
156 
157 struct SPUHEADER {
158 	struct MHEADER mh;
159 	u32 emh;
160 	struct SCTX sa;
161 };
162 
163 #endif /* _SPUM_H_ */
164