SD card interface rewrite to improve compatibility with some SD cards.
[SCSI2SD-V6.git] / software / include / scsi2sd.h
1 // Copyright (C) 2014 Michael McMaster <michael@codesrc.com>
2 //
3 // This file is part of SCSI2SD.
4 //
5 // SCSI2SD is free software: you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation, either version 3 of the License, or
8 // (at your option) any later version.
9 //
10 // SCSI2SD is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
14 //
15 // You should have received a copy of the GNU General Public License
16 // along with SCSI2SD. If not, see <http://www.gnu.org/licenses/>.
17 #ifndef scsi2sd_h
18 #define scsi2sd_h
19
20 #ifdef __cplusplus
21 extern "C" {
22 #endif
23
24 /* Common type definitions shared between the firmware and config tools
25
26 The configuration data is stored in flash.
27
28 The flash is organised as 2 arrays of 256 rows, with each row
29 having 256 bytes. Total of 128kb.
30
31 Linear flash memory map:
32 -----------------------------------------
33 Array 1 |Row 255 | Bootloader metadata
34 ---------------------------------
35 |Row 254 |
36 |Row 252 | Blank
37 ---------------------------------
38 |Row 251 |
39 | ... |
40 |Row 236 | Config target 3
41 | ... |
42 |Row 220 | Config target 2
43 | ... |
44 |Row 204 | Config target 1
45 | ... |
46 |Row 188 | Config target 0
47 ---------------------------------
48 |Row 235 |
49 | ... |
50 |Row 0 |
51 --------| |
52 Array 0 |Row 255 | Blank
53 ---------------------------------
54 |Row 121 |
55 | ... |
56 |Row 37 | Application
57 ---------------------------------
58 |Row 36 |
59 | ... |
60 |Row 0 | Bootloader
61
62 */
63
64 #include "stdint.h"
65
66 #define MAX_SCSI_TARGETS 4
67 #define SCSI_CONFIG_ARRAY 1
68 #define SCSI_CONFIG_ROWS 16
69
70 // 256 bytes data, 32 bytes ECC
71 #define SCSI_CONFIG_ROW_SIZE 256
72 #define SCSI_CONFIG_ROW_ECC 288
73 #define SCSI_CONFIG_0_ROW 188
74 #define SCSI_CONFIG_1_ROW 204
75 #define SCSI_CONFIG_2_ROW 220
76 #define SCSI_CONFIG_3_ROW 236
77
78 typedef enum
79 {
80 CONFIG_TARGET_ID_BITS = 0x07,
81 CONFIG_TARGET_ENABLED = 0x80
82 } CONFIG_TARGET_FLAGS;
83
84 typedef enum
85 {
86 CONFIG_ENABLE_UNIT_ATTENTION = 1,
87 CONFIG_ENABLE_PARITY = 2,
88 } CONFIG_FLAGS;
89
90 typedef enum
91 {
92 CONFIG_FIXED,
93 CONFIG_REMOVEABLE,
94 CONFIG_OPTICAL,
95 CONFIG_FLOPPY_14MB
96 } CONFIG_TYPE;
97
98 typedef struct __attribute__((packed))
99 {
100 uint8_t deviceType;
101 uint8_t pageCode;
102 uint8_t reserved;
103 uint8_t pageLength;
104 uint8_t data[0]; // pageLength bytes.
105 } VPD;
106
107 typedef struct __attribute__((packed))
108 {
109 // bits 7 -> 3 = CONFIG_TARGET_FLAGS
110 // bits 2 -> 0 = target SCSI ID.
111 uint8_t scsiId;
112
113 uint8_t deviceType; // CONFIG_TYPE
114 uint8_t flags; // CONFIG_FLAGS
115 uint8_t pad0;
116
117 uint32_t sdSectorStart;
118 uint32_t scsiSectors;
119
120 uint16_t bytesPerSector;
121
122 // Max allowed by legacy IBM-PC bios is 6 bits (63)
123 uint16_t sectorsPerTrack;
124
125 // MS-Dos up to 7.10 will crash on >= 256 heads.
126 uint16_t headsPerCylinder;
127
128
129 char vendor[8];
130 char prodId[16];
131 char revision[4];
132 char serial[16];
133
134 uint8_t reserved[962]; // Pad out to 1024 bytes for main section.
135
136 uint8_t vpd[3072]; // Total size is 4k.
137 } TargetConfig;
138
139 typedef enum
140 {
141 CONFIG_NONE, // Invalid
142
143 // Command content:
144 // uint8_t CONFIG_PING
145 // Response:
146 // CONFIG_STATUS
147 CONFIG_PING,
148
149 // Command content:
150 // uint8_t CONFIG_WRITEFLASH
151 // uint8_t[256] flashData
152 // uint8_t flashArray
153 // uint8_t flashRow
154 // Response:
155 // CONFIG_STATUS
156 CONFIG_WRITEFLASH,
157
158 // Command content:
159 // uint8_t CONFIG_READFLASH
160 // uint8_t flashArray
161 // uint8_t flashRow
162 // Response:
163 // 256 bytes of flash
164 CONFIG_READFLASH,
165
166 // Command content:
167 // uint8_t CONFIG_REBOOT
168 // Response: None.
169 CONFIG_REBOOT,
170
171 // Command content:
172 // uint8_t CONFIG_INFO
173 // Response:
174 // uint8_t[16] CSD
175 // uint8_t[16] CID
176 CONFIG_SDINFO
177 } CONFIG_COMMAND;
178
179 typedef enum
180 {
181 CONFIG_STATUS_GOOD,
182 CONFIG_STATUS_ERR
183 } CONFIG_STATUS;
184
185
186
187
188 #ifdef __cplusplus
189 } // extern "C"
190
191 #include <type_traits>
192 static_assert(
193 std::is_pod<TargetConfig>::value, "Misuse of TargetConfig struct"
194 );
195 static_assert(
196 sizeof(TargetConfig) == 4096,
197 "TargetConfig struct size mismatch"
198 );
199
200 #endif
201
202 #endif