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1 | 663e8e51 | ths | /*
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2 | 663e8e51 | ths | * QEMU EEPROM 93xx emulation
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3 | 663e8e51 | ths | *
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4 | 663e8e51 | ths | * Copyright (c) 2006-2007 Stefan Weil
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5 | 663e8e51 | ths | *
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6 | 663e8e51 | ths | * This program is free software; you can redistribute it and/or modify
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7 | 663e8e51 | ths | * it under the terms of the GNU General Public License as published by
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8 | 663e8e51 | ths | * the Free Software Foundation; either version 2 of the License, or
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9 | 663e8e51 | ths | * (at your option) any later version.
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10 | 663e8e51 | ths | *
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11 | 663e8e51 | ths | * This program is distributed in the hope that it will be useful,
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12 | 663e8e51 | ths | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 663e8e51 | ths | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | 663e8e51 | ths | * GNU General Public License for more details.
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15 | 663e8e51 | ths | *
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16 | 663e8e51 | ths | * You should have received a copy of the GNU General Public License
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17 | 8167ee88 | Blue Swirl | * along with this program; if not, see <http://www.gnu.org/licenses/>.
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18 | 663e8e51 | ths | */
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19 | 663e8e51 | ths | |
20 | 663e8e51 | ths | /* Emulation for serial EEPROMs:
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21 | 663e8e51 | ths | * NMC93C06 256-Bit (16 x 16)
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22 | 663e8e51 | ths | * NMC93C46 1024-Bit (64 x 16)
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23 | 663e8e51 | ths | * NMC93C56 2028 Bit (128 x 16)
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24 | 663e8e51 | ths | * NMC93C66 4096 Bit (256 x 16)
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25 | 663e8e51 | ths | * Compatible devices include FM93C46 and others.
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26 | 663e8e51 | ths | *
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27 | 663e8e51 | ths | * Other drivers use these interface functions:
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28 | 663e8e51 | ths | * eeprom93xx_new - add a new EEPROM (with 16, 64 or 256 words)
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29 | 663e8e51 | ths | * eeprom93xx_free - destroy EEPROM
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30 | 663e8e51 | ths | * eeprom93xx_read - read data from the EEPROM
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31 | 663e8e51 | ths | * eeprom93xx_write - write data to the EEPROM
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32 | 663e8e51 | ths | * eeprom93xx_data - get EEPROM data array for external manipulation
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33 | 663e8e51 | ths | *
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34 | 663e8e51 | ths | * Todo list:
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35 | 663e8e51 | ths | * - No emulation of EEPROM timings.
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36 | 663e8e51 | ths | */
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37 | 663e8e51 | ths | |
38 | 87ecb68b | pbrook | #include "hw.h" |
39 | 663e8e51 | ths | #include "eeprom93xx.h" |
40 | 663e8e51 | ths | |
41 | 663e8e51 | ths | /* Debug EEPROM emulation. */
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42 | 663e8e51 | ths | //~ #define DEBUG_EEPROM
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43 | 663e8e51 | ths | |
44 | 663e8e51 | ths | #ifdef DEBUG_EEPROM
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45 | 001faf32 | Blue Swirl | #define logout(fmt, ...) fprintf(stderr, "EEPROM\t%-24s" fmt, __func__, ## __VA_ARGS__) |
46 | 663e8e51 | ths | #else
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47 | 001faf32 | Blue Swirl | #define logout(fmt, ...) ((void)0) |
48 | 663e8e51 | ths | #endif
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49 | 663e8e51 | ths | |
50 | 7ab2589c | aurel32 | #define EEPROM_INSTANCE 0 |
51 | 7ab2589c | aurel32 | #define OLD_EEPROM_VERSION 20061112 |
52 | 7ab2589c | aurel32 | #define EEPROM_VERSION (OLD_EEPROM_VERSION + 1) |
53 | 663e8e51 | ths | |
54 | 663e8e51 | ths | #if 0
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55 | 663e8e51 | ths | typedef enum {
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56 | 663e8e51 | ths | eeprom_read = 0x80, /* read register xx */
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57 | 663e8e51 | ths | eeprom_write = 0x40, /* write register xx */
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58 | 663e8e51 | ths | eeprom_erase = 0xc0, /* erase register xx */
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59 | 663e8e51 | ths | eeprom_ewen = 0x30, /* erase / write enable */
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60 | 663e8e51 | ths | eeprom_ewds = 0x00, /* erase / write disable */
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61 | 663e8e51 | ths | eeprom_eral = 0x20, /* erase all registers */
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62 | 663e8e51 | ths | eeprom_wral = 0x10, /* write all registers */
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63 | 663e8e51 | ths | eeprom_amask = 0x0f,
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64 | 663e8e51 | ths | eeprom_imask = 0xf0
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65 | 663e8e51 | ths | } eeprom_instruction_t;
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66 | 663e8e51 | ths | #endif
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67 | 663e8e51 | ths | |
68 | 663e8e51 | ths | #ifdef DEBUG_EEPROM
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69 | 663e8e51 | ths | static const char *opstring[] = { |
70 | 663e8e51 | ths | "extended", "write", "read", "erase" |
71 | 663e8e51 | ths | }; |
72 | 663e8e51 | ths | #endif
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73 | 663e8e51 | ths | |
74 | c227f099 | Anthony Liguori | struct _eeprom_t {
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75 | 663e8e51 | ths | uint8_t tick; |
76 | 663e8e51 | ths | uint8_t address; |
77 | 663e8e51 | ths | uint8_t command; |
78 | 663e8e51 | ths | uint8_t writeable; |
79 | 663e8e51 | ths | |
80 | 663e8e51 | ths | uint8_t eecs; |
81 | 663e8e51 | ths | uint8_t eesk; |
82 | 663e8e51 | ths | uint8_t eedo; |
83 | 663e8e51 | ths | |
84 | 663e8e51 | ths | uint8_t addrbits; |
85 | 7ab2589c | aurel32 | uint16_t size; |
86 | 663e8e51 | ths | uint16_t data; |
87 | 663e8e51 | ths | uint16_t contents[0];
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88 | 663e8e51 | ths | }; |
89 | 663e8e51 | ths | |
90 | 663e8e51 | ths | /* Code for saving and restoring of EEPROM state. */
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91 | 663e8e51 | ths | |
92 | c4a0f2d3 | Juan Quintela | /* Restore an uint16_t from an uint8_t
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93 | c4a0f2d3 | Juan Quintela | This is a Big hack, but it is how the old state did it.
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94 | c4a0f2d3 | Juan Quintela | */
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95 | c4a0f2d3 | Juan Quintela | |
96 | c4a0f2d3 | Juan Quintela | static int get_uint16_from_uint8(QEMUFile *f, void *pv, size_t size) |
97 | 663e8e51 | ths | { |
98 | c4a0f2d3 | Juan Quintela | uint16_t *v = pv; |
99 | c4a0f2d3 | Juan Quintela | *v = qemu_get_ubyte(f); |
100 | c4a0f2d3 | Juan Quintela | return 0; |
101 | c4a0f2d3 | Juan Quintela | } |
102 | d4ae799c | aurel32 | |
103 | c4a0f2d3 | Juan Quintela | static void put_unused(QEMUFile *f, void *pv, size_t size) |
104 | c4a0f2d3 | Juan Quintela | { |
105 | c4a0f2d3 | Juan Quintela | fprintf(stderr, "uint16_from_uint8 is used only for backwards compatibility.\n");
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106 | c4a0f2d3 | Juan Quintela | fprintf(stderr, "Never should be used to write a new state.\n");
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107 | c4a0f2d3 | Juan Quintela | exit(0);
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108 | c4a0f2d3 | Juan Quintela | } |
109 | d4ae799c | aurel32 | |
110 | d05ac8fa | Blue Swirl | static const VMStateInfo vmstate_hack_uint16_from_uint8 = { |
111 | c4a0f2d3 | Juan Quintela | .name = "uint16_from_uint8",
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112 | c4a0f2d3 | Juan Quintela | .get = get_uint16_from_uint8, |
113 | c4a0f2d3 | Juan Quintela | .put = put_unused, |
114 | c4a0f2d3 | Juan Quintela | }; |
115 | d4ae799c | aurel32 | |
116 | c4a0f2d3 | Juan Quintela | #define VMSTATE_UINT16_HACK_TEST(_f, _s, _t) \
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117 | c4a0f2d3 | Juan Quintela | VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_hack_uint16_from_uint8, uint16_t)
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118 | 663e8e51 | ths | |
119 | c4a0f2d3 | Juan Quintela | static bool is_old_eeprom_version(void *opaque, int version_id) |
120 | 663e8e51 | ths | { |
121 | c4a0f2d3 | Juan Quintela | return version_id == OLD_EEPROM_VERSION;
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122 | c4a0f2d3 | Juan Quintela | } |
123 | d4ae799c | aurel32 | |
124 | c4a0f2d3 | Juan Quintela | static const VMStateDescription vmstate_eeprom = { |
125 | c4a0f2d3 | Juan Quintela | .name = "eeprom",
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126 | c4a0f2d3 | Juan Quintela | .version_id = EEPROM_VERSION, |
127 | c4a0f2d3 | Juan Quintela | .minimum_version_id = OLD_EEPROM_VERSION, |
128 | c4a0f2d3 | Juan Quintela | .minimum_version_id_old = OLD_EEPROM_VERSION, |
129 | c4a0f2d3 | Juan Quintela | .fields = (VMStateField []) { |
130 | c4a0f2d3 | Juan Quintela | VMSTATE_UINT8(tick, eeprom_t), |
131 | c4a0f2d3 | Juan Quintela | VMSTATE_UINT8(address, eeprom_t), |
132 | c4a0f2d3 | Juan Quintela | VMSTATE_UINT8(command, eeprom_t), |
133 | c4a0f2d3 | Juan Quintela | VMSTATE_UINT8(writeable, eeprom_t), |
134 | d4ae799c | aurel32 | |
135 | c4a0f2d3 | Juan Quintela | VMSTATE_UINT8(eecs, eeprom_t), |
136 | c4a0f2d3 | Juan Quintela | VMSTATE_UINT8(eesk, eeprom_t), |
137 | c4a0f2d3 | Juan Quintela | VMSTATE_UINT8(eedo, eeprom_t), |
138 | d4ae799c | aurel32 | |
139 | c4a0f2d3 | Juan Quintela | VMSTATE_UINT8(addrbits, eeprom_t), |
140 | c4a0f2d3 | Juan Quintela | VMSTATE_UINT16_HACK_TEST(size, eeprom_t, is_old_eeprom_version), |
141 | c4a0f2d3 | Juan Quintela | VMSTATE_UNUSED_TEST(is_old_eeprom_version, 1),
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142 | c4a0f2d3 | Juan Quintela | VMSTATE_UINT16_EQUAL_V(size, eeprom_t, EEPROM_VERSION), |
143 | c4a0f2d3 | Juan Quintela | VMSTATE_UINT16(data, eeprom_t), |
144 | c4a0f2d3 | Juan Quintela | VMSTATE_VARRAY_UINT16_UNSAFE(contents, eeprom_t, size, 0,
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145 | c4a0f2d3 | Juan Quintela | vmstate_info_uint16, uint16_t), |
146 | c4a0f2d3 | Juan Quintela | VMSTATE_END_OF_LIST() |
147 | 663e8e51 | ths | } |
148 | c4a0f2d3 | Juan Quintela | }; |
149 | 663e8e51 | ths | |
150 | c227f099 | Anthony Liguori | void eeprom93xx_write(eeprom_t *eeprom, int eecs, int eesk, int eedi) |
151 | 663e8e51 | ths | { |
152 | 663e8e51 | ths | uint8_t tick = eeprom->tick; |
153 | 663e8e51 | ths | uint8_t eedo = eeprom->eedo; |
154 | 663e8e51 | ths | uint16_t address = eeprom->address; |
155 | 663e8e51 | ths | uint8_t command = eeprom->command; |
156 | 663e8e51 | ths | |
157 | 663e8e51 | ths | logout("CS=%u SK=%u DI=%u DO=%u, tick = %u\n",
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158 | 663e8e51 | ths | eecs, eesk, eedi, eedo, tick); |
159 | 663e8e51 | ths | |
160 | 663e8e51 | ths | if (! eeprom->eecs && eecs) {
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161 | 663e8e51 | ths | /* Start chip select cycle. */
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162 | 663e8e51 | ths | logout("Cycle start, waiting for 1st start bit (0)\n");
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163 | 663e8e51 | ths | tick = 0;
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164 | 663e8e51 | ths | command = 0x0;
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165 | 663e8e51 | ths | address = 0x0;
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166 | 663e8e51 | ths | } else if (eeprom->eecs && ! eecs) { |
167 | 663e8e51 | ths | /* End chip select cycle. This triggers write / erase. */
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168 | 663e8e51 | ths | if (eeprom->writeable) {
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169 | 663e8e51 | ths | uint8_t subcommand = address >> (eeprom->addrbits - 2);
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170 | 663e8e51 | ths | if (command == 0 && subcommand == 2) { |
171 | 663e8e51 | ths | /* Erase all. */
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172 | 663e8e51 | ths | for (address = 0; address < eeprom->size; address++) { |
173 | 663e8e51 | ths | eeprom->contents[address] = 0xffff;
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174 | 663e8e51 | ths | } |
175 | 663e8e51 | ths | } else if (command == 3) { |
176 | 663e8e51 | ths | /* Erase word. */
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177 | 663e8e51 | ths | eeprom->contents[address] = 0xffff;
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178 | 663e8e51 | ths | } else if (tick >= 2 + 2 + eeprom->addrbits + 16) { |
179 | 663e8e51 | ths | if (command == 1) { |
180 | 663e8e51 | ths | /* Write word. */
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181 | 663e8e51 | ths | eeprom->contents[address] &= eeprom->data; |
182 | 663e8e51 | ths | } else if (command == 0 && subcommand == 1) { |
183 | 663e8e51 | ths | /* Write all. */
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184 | 663e8e51 | ths | for (address = 0; address < eeprom->size; address++) { |
185 | 663e8e51 | ths | eeprom->contents[address] &= eeprom->data; |
186 | 663e8e51 | ths | } |
187 | 663e8e51 | ths | } |
188 | 663e8e51 | ths | } |
189 | 663e8e51 | ths | } |
190 | 663e8e51 | ths | /* Output DO is tristate, read results in 1. */
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191 | 663e8e51 | ths | eedo = 1;
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192 | 663e8e51 | ths | } else if (eecs && ! eeprom->eesk && eesk) { |
193 | 663e8e51 | ths | /* Raising edge of clock shifts data in. */
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194 | 663e8e51 | ths | if (tick == 0) { |
195 | 663e8e51 | ths | /* Wait for 1st start bit. */
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196 | 663e8e51 | ths | if (eedi == 0) { |
197 | 663e8e51 | ths | logout("Got correct 1st start bit, waiting for 2nd start bit (1)\n");
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198 | 663e8e51 | ths | tick++; |
199 | 663e8e51 | ths | } else {
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200 | 663e8e51 | ths | logout("wrong 1st start bit (is 1, should be 0)\n");
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201 | 663e8e51 | ths | tick = 2;
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202 | 663e8e51 | ths | //~ assert(!"wrong start bit");
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203 | 663e8e51 | ths | } |
204 | 663e8e51 | ths | } else if (tick == 1) { |
205 | 663e8e51 | ths | /* Wait for 2nd start bit. */
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206 | 663e8e51 | ths | if (eedi != 0) { |
207 | 663e8e51 | ths | logout("Got correct 2nd start bit, getting command + address\n");
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208 | 663e8e51 | ths | tick++; |
209 | 663e8e51 | ths | } else {
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210 | 663e8e51 | ths | logout("1st start bit is longer than needed\n");
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211 | 663e8e51 | ths | } |
212 | 663e8e51 | ths | } else if (tick < 2 + 2) { |
213 | 663e8e51 | ths | /* Got 2 start bits, transfer 2 opcode bits. */
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214 | 663e8e51 | ths | tick++; |
215 | 663e8e51 | ths | command <<= 1;
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216 | 663e8e51 | ths | if (eedi) {
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217 | 663e8e51 | ths | command += 1;
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218 | 663e8e51 | ths | } |
219 | 663e8e51 | ths | } else if (tick < 2 + 2 + eeprom->addrbits) { |
220 | 663e8e51 | ths | /* Got 2 start bits and 2 opcode bits, transfer all address bits. */
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221 | 663e8e51 | ths | tick++; |
222 | 663e8e51 | ths | address = ((address << 1) | eedi);
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223 | 663e8e51 | ths | if (tick == 2 + 2 + eeprom->addrbits) { |
224 | 663e8e51 | ths | logout("%s command, address = 0x%02x (value 0x%04x)\n",
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225 | 663e8e51 | ths | opstring[command], address, eeprom->contents[address]); |
226 | 663e8e51 | ths | if (command == 2) { |
227 | 663e8e51 | ths | eedo = 0;
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228 | 663e8e51 | ths | } |
229 | 663e8e51 | ths | address = address % eeprom->size; |
230 | 663e8e51 | ths | if (command == 0) { |
231 | 663e8e51 | ths | /* Command code in upper 2 bits of address. */
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232 | 663e8e51 | ths | switch (address >> (eeprom->addrbits - 2)) { |
233 | 663e8e51 | ths | case 0: |
234 | 663e8e51 | ths | logout("write disable command\n");
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235 | 663e8e51 | ths | eeprom->writeable = 0;
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236 | 663e8e51 | ths | break;
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237 | 663e8e51 | ths | case 1: |
238 | 663e8e51 | ths | logout("write all command\n");
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239 | 663e8e51 | ths | break;
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240 | 663e8e51 | ths | case 2: |
241 | 663e8e51 | ths | logout("erase all command\n");
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242 | 663e8e51 | ths | break;
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243 | 663e8e51 | ths | case 3: |
244 | 663e8e51 | ths | logout("write enable command\n");
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245 | 663e8e51 | ths | eeprom->writeable = 1;
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246 | 663e8e51 | ths | break;
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247 | 663e8e51 | ths | } |
248 | 663e8e51 | ths | } else {
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249 | 663e8e51 | ths | /* Read, write or erase word. */
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250 | 663e8e51 | ths | eeprom->data = eeprom->contents[address]; |
251 | 663e8e51 | ths | } |
252 | 663e8e51 | ths | } |
253 | 663e8e51 | ths | } else if (tick < 2 + 2 + eeprom->addrbits + 16) { |
254 | 663e8e51 | ths | /* Transfer 16 data bits. */
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255 | 663e8e51 | ths | tick++; |
256 | 663e8e51 | ths | if (command == 2) { |
257 | 663e8e51 | ths | /* Read word. */
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258 | 663e8e51 | ths | eedo = ((eeprom->data & 0x8000) != 0); |
259 | 663e8e51 | ths | } |
260 | 663e8e51 | ths | eeprom->data <<= 1;
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261 | 663e8e51 | ths | eeprom->data += eedi; |
262 | 663e8e51 | ths | } else {
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263 | 663e8e51 | ths | logout("additional unneeded tick, not processed\n");
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264 | 663e8e51 | ths | } |
265 | 663e8e51 | ths | } |
266 | 663e8e51 | ths | /* Save status of EEPROM. */
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267 | 663e8e51 | ths | eeprom->tick = tick; |
268 | 663e8e51 | ths | eeprom->eecs = eecs; |
269 | 663e8e51 | ths | eeprom->eesk = eesk; |
270 | 663e8e51 | ths | eeprom->eedo = eedo; |
271 | 663e8e51 | ths | eeprom->address = address; |
272 | 663e8e51 | ths | eeprom->command = command; |
273 | 663e8e51 | ths | } |
274 | 663e8e51 | ths | |
275 | c227f099 | Anthony Liguori | uint16_t eeprom93xx_read(eeprom_t *eeprom) |
276 | 663e8e51 | ths | { |
277 | 663e8e51 | ths | /* Return status of pin DO (0 or 1). */
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278 | 663e8e51 | ths | logout("CS=%u DO=%u\n", eeprom->eecs, eeprom->eedo);
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279 | 663e8e51 | ths | return (eeprom->eedo);
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280 | 663e8e51 | ths | } |
281 | 663e8e51 | ths | |
282 | 663e8e51 | ths | #if 0
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283 | 663e8e51 | ths | void eeprom93xx_reset(eeprom_t *eeprom)
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284 | 663e8e51 | ths | {
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285 | 663e8e51 | ths | /* prepare eeprom */
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286 | 663e8e51 | ths | logout("eeprom = 0x%p\n", eeprom);
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287 | 663e8e51 | ths | eeprom->tick = 0;
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288 | 663e8e51 | ths | eeprom->command = 0;
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289 | 663e8e51 | ths | }
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290 | 663e8e51 | ths | #endif
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291 | 663e8e51 | ths | |
292 | 5fce2b3e | Alex Williamson | eeprom_t *eeprom93xx_new(DeviceState *dev, uint16_t nwords) |
293 | 663e8e51 | ths | { |
294 | 663e8e51 | ths | /* Add a new EEPROM (with 16, 64 or 256 words). */
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295 | c227f099 | Anthony Liguori | eeprom_t *eeprom; |
296 | 663e8e51 | ths | uint8_t addrbits; |
297 | 663e8e51 | ths | |
298 | 663e8e51 | ths | switch (nwords) {
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299 | 663e8e51 | ths | case 16: |
300 | 663e8e51 | ths | case 64: |
301 | 663e8e51 | ths | addrbits = 6;
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302 | 663e8e51 | ths | break;
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303 | 663e8e51 | ths | case 128: |
304 | 663e8e51 | ths | case 256: |
305 | 663e8e51 | ths | addrbits = 8;
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306 | 663e8e51 | ths | break;
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307 | 663e8e51 | ths | default:
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308 | 663e8e51 | ths | assert(!"Unsupported EEPROM size, fallback to 64 words!");
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309 | 663e8e51 | ths | nwords = 64;
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310 | 663e8e51 | ths | addrbits = 6;
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311 | 663e8e51 | ths | } |
312 | 663e8e51 | ths | |
313 | c227f099 | Anthony Liguori | eeprom = (eeprom_t *)qemu_mallocz(sizeof(*eeprom) + nwords * 2); |
314 | 663e8e51 | ths | eeprom->size = nwords; |
315 | 663e8e51 | ths | eeprom->addrbits = addrbits; |
316 | 663e8e51 | ths | /* Output DO is tristate, read results in 1. */
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317 | 663e8e51 | ths | eeprom->eedo = 1;
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318 | 663e8e51 | ths | logout("eeprom = 0x%p, nwords = %u\n", eeprom, nwords);
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319 | 5fce2b3e | Alex Williamson | vmstate_register(dev, 0, &vmstate_eeprom, eeprom);
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320 | 663e8e51 | ths | return eeprom;
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321 | 663e8e51 | ths | } |
322 | 663e8e51 | ths | |
323 | 5fce2b3e | Alex Williamson | void eeprom93xx_free(DeviceState *dev, eeprom_t *eeprom)
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324 | 663e8e51 | ths | { |
325 | 663e8e51 | ths | /* Destroy EEPROM. */
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326 | 663e8e51 | ths | logout("eeprom = 0x%p\n", eeprom);
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327 | 5fce2b3e | Alex Williamson | vmstate_unregister(dev, &vmstate_eeprom, eeprom); |
328 | 663e8e51 | ths | qemu_free(eeprom); |
329 | 663e8e51 | ths | } |
330 | 663e8e51 | ths | |
331 | c227f099 | Anthony Liguori | uint16_t *eeprom93xx_data(eeprom_t *eeprom) |
332 | 663e8e51 | ths | { |
333 | 663e8e51 | ths | /* Get EEPROM data array. */
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334 | 663e8e51 | ths | return &eeprom->contents[0]; |
335 | 663e8e51 | ths | } |
336 | 663e8e51 | ths | |
337 | 663e8e51 | ths | /* eof */ |