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annotate nor.c @ 1996:e35b00626b3e

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Update cycle to VGM sample conversion based on ValleyBell's suggestion
author Michael Pavone <pavone@retrodev.com>
date Thu, 18 Jun 2020 00:28:53 -0700
parents 1f745318f10a
children
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rev   line source
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1 #include "genesis.h"
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include "util.h"
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5
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6 enum {
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7 NOR_NORMAL,
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8 NOR_PRODUCTID,
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9 NOR_BOOTBLOCK
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10 };
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11
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12 enum {
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13 NOR_CMD_IDLE,
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14 NOR_CMD_AA,
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15 NOR_CMD_55
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16 };
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17
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18 //Technically this value shoudl be slightly different between NTSC and PAL
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19 //as it's defined as 200 micro-seconds, not in clock cycles
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20 #define NOR_WRITE_PAUSE 10690
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21
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22 void nor_flash_init(nor_state *state, uint8_t *buffer, uint32_t size, uint32_t page_size, uint16_t product_id, uint8_t bus_flags)
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23 {
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24 state->buffer = buffer;
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25 state->page_buffer = malloc(page_size);
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26 memset(state->page_buffer, 0xFF, page_size);
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27 state->size = size;
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28 state->page_size = page_size;
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29 state->product_id = product_id;
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30 state->last_write_cycle = 0xFFFFFFFF;
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31 state->mode = NOR_NORMAL;
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32 state->cmd_state = NOR_CMD_IDLE;
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33 state->alt_cmd = 0;
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34 state->bus_flags = bus_flags;
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35 state->cmd_address1 = 0x5555;
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36 state->cmd_address2 = 0x2AAA;
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37 }
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38
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39 void nor_run(nor_state *state, m68k_context *m68k, uint32_t cycle)
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40 {
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41 if (state->last_write_cycle == 0xFFFFFFFF) {
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42 return;
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43 }
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44 if (cycle - state->last_write_cycle >= NOR_WRITE_PAUSE) {
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45 state->last_write_cycle = 0xFFFFFFFF;
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46 for (uint32_t i = 0; i < state->page_size; i++) {
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47 state->buffer[state->current_page + i] = state->page_buffer[i];
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48 }
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49 memset(state->page_buffer, 0xFF, state->page_size);
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50 if (state->bus_flags == RAM_FLAG_BOTH) {
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51 //TODO: add base address of NOR device to start and end addresses
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52 m68k_invalidate_code_range(m68k, state->current_page, state->current_page + state->page_size);
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53 }
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54 }
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55 }
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56
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57 uint8_t nor_flash_read_b(uint32_t address, void *vcontext)
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58 {
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59 m68k_context *m68k = vcontext;
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60 genesis_context *gen = m68k->system;
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61 nor_state *state = &gen->nor;
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62 if (
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63 ((address & 1) && state->bus_flags == RAM_FLAG_EVEN) ||
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64 (!(address & 1) && state->bus_flags == RAM_FLAG_ODD)
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65 ) {
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66 return 0xFF;
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67 }
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68 if (state->bus_flags != RAM_FLAG_BOTH) {
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69 address = address >> 1;
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70 }
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71
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72 nor_run(state, m68k, m68k->current_cycle);
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73 switch (state->mode)
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74 {
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75 case NOR_NORMAL:
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76 if (state->bus_flags == RAM_FLAG_BOTH) {
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77 address ^= 1;
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78 }
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79 return state->buffer[address & (state->size-1)];
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80 break;
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81 case NOR_PRODUCTID:
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82 switch (address & (state->size - 1))
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83 {
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84 case 0:
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85 return state->product_id >> 8;
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86 case 1:
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87 return state->product_id;
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88 case 2:
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89 //TODO: Implement boot block protection
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90 return 0xFE;
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91 default:
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92 return 0xFE;
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93 } //HERE
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94 break;
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95 case NOR_BOOTBLOCK:
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96 break;
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97 }
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98 return 0xFF;
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99 }
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100
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101 uint16_t nor_flash_read_w(uint32_t address, void *context)
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102 {
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103 uint16_t value = nor_flash_read_b(address, context) << 8;
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104 value |= nor_flash_read_b(address+1, context);
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105 return value;
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106 }
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107
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108 void nor_write_byte(nor_state *state, uint32_t address, uint8_t value, uint32_t cycle)
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109 {
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110 switch(state->mode)
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111 {
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112 case NOR_NORMAL:
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113 if (state->last_write_cycle != 0xFFFFFFFF) {
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114 state->current_page = address & (state->size - 1) & ~(state->page_size - 1);
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115 }
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116 if (state->bus_flags == RAM_FLAG_BOTH) {
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117 address ^= 1;
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118 }
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119 state->page_buffer[address & (state->page_size - 1)] = value;
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120 break;
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121 case NOR_PRODUCTID:
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122 break;
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diff changeset
123 case NOR_BOOTBLOCK:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
124 //TODO: Implement boot block protection
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
125 state->mode = NOR_NORMAL;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
126 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
127 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
128 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
129
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
130 void *nor_flash_write_b(uint32_t address, void *vcontext, uint8_t value)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
131 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
132 m68k_context *m68k = vcontext;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
133 genesis_context *gen = m68k->system;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
134 nor_state *state = &gen->nor;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
135 if (
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
136 ((address & 1) && state->bus_flags == RAM_FLAG_EVEN) ||
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
137 (!(address & 1) && state->bus_flags == RAM_FLAG_ODD)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
138 ) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
139 return vcontext;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
140 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
141 if (state->bus_flags != RAM_FLAG_BOTH) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
142 address = address >> 1;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
143 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
144
1519
1f745318f10a Made the NOR flash emulation a bit more flexible, but not yet flexible enough to properly support the flash chip in the MegaWiFi cart
Michael Pavone <pavone@retrodev.com>
parents: 1414
diff changeset
145 nor_run(state, m68k, m68k->current_cycle);
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
146 switch (state->cmd_state)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
147 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
148 case NOR_CMD_IDLE:
1519
1f745318f10a Made the NOR flash emulation a bit more flexible, but not yet flexible enough to properly support the flash chip in the MegaWiFi cart
Michael Pavone <pavone@retrodev.com>
parents: 1414
diff changeset
149 if (value == 0xAA && (address & (state->size - 1)) == state->cmd_address1) {
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
150 state->cmd_state = NOR_CMD_AA;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
151 } else {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
152 nor_write_byte(state, address, value, m68k->current_cycle);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
153 state->cmd_state = NOR_CMD_IDLE;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
154 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
155 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
156 case NOR_CMD_AA:
1519
1f745318f10a Made the NOR flash emulation a bit more flexible, but not yet flexible enough to properly support the flash chip in the MegaWiFi cart
Michael Pavone <pavone@retrodev.com>
parents: 1414
diff changeset
157 if (value == 0x55 && (address & (state->size - 1)) == state->cmd_address2) {
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
158 state->cmd_state = NOR_CMD_55;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
159 } else {
1519
1f745318f10a Made the NOR flash emulation a bit more flexible, but not yet flexible enough to properly support the flash chip in the MegaWiFi cart
Michael Pavone <pavone@retrodev.com>
parents: 1414
diff changeset
160 nor_write_byte(state, state->cmd_address1, 0xAA, m68k->current_cycle);
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
161 nor_write_byte(state, address, value, m68k->current_cycle);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
162 state->cmd_state = NOR_CMD_IDLE;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
163 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
164 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
165 case NOR_CMD_55:
1519
1f745318f10a Made the NOR flash emulation a bit more flexible, but not yet flexible enough to properly support the flash chip in the MegaWiFi cart
Michael Pavone <pavone@retrodev.com>
parents: 1414
diff changeset
166 if ((address & (state->size - 1)) == state->cmd_address1) {
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
167 if (state->alt_cmd) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
168 switch(value)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
169 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
170 case 0x10:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
171 puts("UNIMPLEMENTED: NOR flash erase");
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
172 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
173 case 0x20:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
174 puts("UNIMPLEMENTED: NOR flash disable protection");
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
175 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
176 case 0x40:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
177 state->mode = NOR_BOOTBLOCK;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
178 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
179 case 0x60:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
180 state->mode = NOR_PRODUCTID;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
181 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
182 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
183 } else {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
184 switch(value)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
185 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
186 case 0x80:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
187 state->alt_cmd = 1;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
188 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
189 case 0x90:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
190 state->mode = NOR_PRODUCTID;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
191 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
192 case 0xA0:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
193 puts("UNIMPLEMENTED: NOR flash enable protection");
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
194 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
195 case 0xF0:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
196 state->mode = NOR_NORMAL;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
197 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
198 default:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
199 printf("Unrecognized unshifted NOR flash command %X\n", value);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
200 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
201 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
202 } else {
1519
1f745318f10a Made the NOR flash emulation a bit more flexible, but not yet flexible enough to properly support the flash chip in the MegaWiFi cart
Michael Pavone <pavone@retrodev.com>
parents: 1414
diff changeset
203 nor_write_byte(state, state->cmd_address1, 0xAA, m68k->current_cycle);
1f745318f10a Made the NOR flash emulation a bit more flexible, but not yet flexible enough to properly support the flash chip in the MegaWiFi cart
Michael Pavone <pavone@retrodev.com>
parents: 1414
diff changeset
204 nor_write_byte(state, state->cmd_address2, 0x55, m68k->current_cycle);
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
205 nor_write_byte(state, address, value, m68k->current_cycle);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
206 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
207 state->cmd_state = NOR_CMD_IDLE;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
208 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
209 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
210 return vcontext;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
211 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
212
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
213 void *nor_flash_write_w(uint32_t address, void *vcontext, uint16_t value)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
214 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
215 nor_flash_write_b(address, vcontext, value >> 8);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
216 return nor_flash_write_b(address + 1, vcontext, value);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
217 }