Mercurial > repos > blastem
annotate nor.c @ 2209:92dc3e24f309
Fix a couple of Z80 disassembler issues
author | Michael Pavone <pavone@retrodev.com> |
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date | Sat, 27 Aug 2022 22:02:32 -0700 |
parents | 1f745318f10a |
children | d74d3998482c |
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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changeset
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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 } |
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
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116 if (state->bus_flags == RAM_FLAG_BOTH) { |
1f745318f10a
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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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|
123 case NOR_BOOTBLOCK: |
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124 //TODO: Implement boot block protection |
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125 state->mode = NOR_NORMAL; |
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126 break; |
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127 } |
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|
128 } |
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|
129 |
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|
130 void *nor_flash_write_b(uint32_t address, void *vcontext, uint8_t value) |
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131 { |
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132 m68k_context *m68k = vcontext; |
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133 genesis_context *gen = m68k->system; |
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134 nor_state *state = &gen->nor; |
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|
135 if ( |
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136 ((address & 1) && state->bus_flags == RAM_FLAG_EVEN) || |
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|
137 (!(address & 1) && state->bus_flags == RAM_FLAG_ODD) |
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|
138 ) { |
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139 return vcontext; |
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140 } |
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|
141 if (state->bus_flags != RAM_FLAG_BOTH) { |
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|
142 address = address >> 1; |
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|
143 } |
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|
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>
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145 nor_run(state, m68k, m68k->current_cycle); |
1414
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|
146 switch (state->cmd_state) |
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147 { |
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|
148 case NOR_CMD_IDLE: |
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149 if (value == 0xAA && (address & (state->size - 1)) == state->cmd_address1) { |
1414
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150 state->cmd_state = NOR_CMD_AA; |
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151 } else { |
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152 nor_write_byte(state, address, value, m68k->current_cycle); |
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153 state->cmd_state = NOR_CMD_IDLE; |
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154 } |
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|
155 break; |
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|
156 case NOR_CMD_AA: |
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|
157 if (value == 0x55 && (address & (state->size - 1)) == state->cmd_address2) { |
1414
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158 state->cmd_state = NOR_CMD_55; |
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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
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|
160 nor_write_byte(state, state->cmd_address1, 0xAA, m68k->current_cycle); |
1414
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161 nor_write_byte(state, address, value, m68k->current_cycle); |
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|
162 state->cmd_state = NOR_CMD_IDLE; |
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|
163 } |
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|
164 break; |
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|
165 case NOR_CMD_55: |
1519
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166 if ((address & (state->size - 1)) == state->cmd_address1) { |
1414
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|
167 if (state->alt_cmd) { |
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168 switch(value) |
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|
169 { |
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|
170 case 0x10: |
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171 puts("UNIMPLEMENTED: NOR flash erase"); |
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changeset
|
172 break; |
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changeset
|
173 case 0x20: |
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|
174 puts("UNIMPLEMENTED: NOR flash disable protection"); |
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|
175 break; |
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changeset
|
176 case 0x40: |
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|
177 state->mode = NOR_BOOTBLOCK; |
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|
178 break; |
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changeset
|
179 case 0x60: |
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|
180 state->mode = NOR_PRODUCTID; |
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|
181 break; |
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|
182 } |
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|
183 } else { |
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|
184 switch(value) |
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|
185 { |
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parents:
diff
changeset
|
186 case 0x80: |
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changeset
|
187 state->alt_cmd = 1; |
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|
188 break; |
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parents:
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changeset
|
189 case 0x90: |
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changeset
|
190 state->mode = NOR_PRODUCTID; |
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diff
changeset
|
191 break; |
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parents:
diff
changeset
|
192 case 0xA0: |
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parents:
diff
changeset
|
193 puts("UNIMPLEMENTED: NOR flash enable protection"); |
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parents:
diff
changeset
|
194 break; |
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parents:
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changeset
|
195 case 0xF0: |
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diff
changeset
|
196 state->mode = NOR_NORMAL; |
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changeset
|
197 break; |
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diff
changeset
|
198 default: |
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parents:
diff
changeset
|
199 printf("Unrecognized unshifted NOR flash command %X\n", value); |
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parents:
diff
changeset
|
200 } |
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parents:
diff
changeset
|
201 } |
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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
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parents:
diff
changeset
|
205 nor_write_byte(state, address, value, m68k->current_cycle); |
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parents:
diff
changeset
|
206 } |
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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
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parents:
diff
changeset
|
208 break; |
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parents:
diff
changeset
|
209 } |
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parents:
diff
changeset
|
210 return vcontext; |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
211 } |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
212 |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
213 void *nor_flash_write_w(uint32_t address, void *vcontext, uint16_t value) |
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parents:
diff
changeset
|
214 { |
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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
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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
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parents:
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|
217 } |