Mercurial > repos > blastem

annotate nor.c @ 2013:dcdad92f84a4

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Multiplying by zero and shifting by zero are very different. Fixes regression in Overdrive 2
author Michael Pavone <pavone@retrodev.com>
date Sun, 01 Nov 2020 13:28:31 -0800
parents 1f745318f10a
children d74d3998482c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
1 #include "genesis.h"
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
2 #include <stdlib.h>
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
3 #include <string.h>
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
4 #include "util.h"
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
5
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
6 enum {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
7 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
8 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
9 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
10 };
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
11
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
12 enum {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
13 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
14 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
15 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
16 };
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
17
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
18 //Technically this value shoudl be slightly different between NTSC and PAL
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
19 //as it's defined as 200 micro-seconds, not in clock cycles
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
20 #define NOR_WRITE_PAUSE 10690
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
21
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
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)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
23 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
24 state->buffer = buffer;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
25 state->page_buffer = malloc(page_size);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
26 memset(state->page_buffer, 0xFF, page_size);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
27 state->size = size;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
28 state->page_size = page_size;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
29 state->product_id = product_id;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
30 state->last_write_cycle = 0xFFFFFFFF;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
31 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
32 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
33 state->alt_cmd = 0;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
34 state->bus_flags = bus_flags;
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
35 state->cmd_address1 = 0x5555;
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
36 state->cmd_address2 = 0x2AAA;
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
37 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
38
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
39 void nor_run(nor_state *state, m68k_context *m68k, uint32_t 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
40 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
41 if (state->last_write_cycle == 0xFFFFFFFF) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
42 return;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
43 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
44 if (cycle - state->last_write_cycle >= NOR_WRITE_PAUSE) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
45 state->last_write_cycle = 0xFFFFFFFF;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
46 for (uint32_t i = 0; i < state->page_size; i++) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
47 state->buffer[state->current_page + i] = state->page_buffer[i];
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
48 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
49 memset(state->page_buffer, 0xFF, state->page_size);
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
50 if (state->bus_flags == RAM_FLAG_BOTH) {
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
51 //TODO: add base address of NOR device to start and end addresses
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
52 m68k_invalidate_code_range(m68k, state->current_page, state->current_page + state->page_size);
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
53 }
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
54 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
55 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
56
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
57 uint8_t nor_flash_read_b(uint32_t address, void *vcontext)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
58 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
59 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
60 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
61 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
62 if (
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
63 ((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
64 (!(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
65 ) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
66 return 0xFF;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
67 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
68 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
69 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
70 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
71
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
72 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
73 switch (state->mode)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
74 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
75 case NOR_NORMAL:
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
76 if (state->bus_flags == RAM_FLAG_BOTH) {
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
77 address ^= 1;
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
78 }
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
79 return state->buffer[address & (state->size-1)];
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
80 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
81 case 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
82 switch (address & (state->size - 1))
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
83 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
84 case 0:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
85 return state->product_id >> 8;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
86 case 1:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
87 return state->product_id;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
88 case 2:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
89 //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
90 return 0xFE;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
91 default:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
92 return 0xFE;
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
93 } //HERE
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
94 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
95 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
96 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
97 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
98 return 0xFF;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
99 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
100
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
101 uint16_t nor_flash_read_w(uint32_t address, void *context)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
102 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
103 uint16_t value = nor_flash_read_b(address, context) << 8;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
104 value |= nor_flash_read_b(address+1, context);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
105 return value;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
106 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
107
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
108 void nor_write_byte(nor_state *state, uint32_t address, uint8_t value, uint32_t cycle)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
109 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
110 switch(state->mode)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
111 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
112 case 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
113 if (state->last_write_cycle != 0xFFFFFFFF) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
114 state->current_page = address & (state->size - 1) & ~(state->page_size - 1);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
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
diff changeset
116 if (state->bus_flags == RAM_FLAG_BOTH) {
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
117 address ^= 1;
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
118 }
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
119 state->page_buffer[address & (state->page_size - 1)] = value;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
120 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
121 case 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
122 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
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 }