2 // Jaguar EEPROM handler
5 // GCC/SDL port by Niels Wagenaar (Linux/WIN32) and Caz (BeOS)
6 // Cleanups/enhancements by James Hammons
7 // (C) 2010 Underground Software
9 // JLH = James Hammons <jlhamm@acm.org>
12 // --- ---------- -------------------------------------------------------------
13 // JLH 01/16/2010 Created this log ;-)
19 #include <string.h> // For memset
26 static uint16_t eeprom_ram[64];
27 static uint16_t cdromEEPROM[64];
30 // Private function prototypes
33 static void EEPROMSave(void);
34 static void eeprom_set_di(uint32_t state);
35 static void eeprom_set_cs(uint32_t state);
36 static uint32_t eeprom_get_do(void);
38 enum { EE_STATE_START = 1, EE_STATE_OP_A, EE_STATE_OP_B, EE_STATE_0, EE_STATE_1,
39 EE_STATE_2, EE_STATE_3, EE_STATE_0_0, EE_READ_ADDRESS, EE_STATE_0_0_0,
40 EE_STATE_0_0_1, EE_STATE_0_0_2, EE_STATE_0_0_3, EE_STATE_0_0_1_0, EE_READ_DATA,
41 EE_STATE_BUSY, EE_STATE_1_0, EE_STATE_1_1, EE_STATE_2_0, EE_STATE_3_0 };
43 // Local global variables
45 static uint16_t jerry_ee_state = EE_STATE_START;
46 static uint16_t jerry_ee_op = 0;
47 static uint16_t jerry_ee_rstate = 0;
48 static uint16_t jerry_ee_address_data = 0;
49 static uint16_t jerry_ee_address_cnt = 6;
50 static uint16_t jerry_ee_data = 0;
51 static uint16_t jerry_ee_data_cnt = 16;
52 static uint16_t jerry_writes_enabled = 0;
53 static uint16_t jerry_ee_direct_jump = 0;
55 static char eeprom_filename[MAX_PATH];
56 static char cdromEEPROMFilename[MAX_PATH];
57 static bool haveEEPROM = false;
58 static bool haveCDROMEEPROM = false;
63 // Handle regular cartridge EEPROM
64 sprintf(eeprom_filename, "%s%08X.eep", vjs.EEPROMPath, (unsigned int)jaguarMainROMCRC32);
65 sprintf(cdromEEPROMFilename, "%scdrom.eeprom", vjs.EEPROMPath);
66 FILE * fp = fopen(eeprom_filename, "rb");
70 fread(eeprom_ram, 1, 128, fp);
72 WriteLog("EEPROM: Loaded from %s\n", eeprom_filename);
76 WriteLog("EEPROM: Could not open file \"%s\"!\n", eeprom_filename);
78 // Handle JagCD EEPROM
79 fp = fopen(cdromEEPROMFilename, "rb");
83 fread(cdromEEPROM, 1, 128, fp);
85 WriteLog("EEPROM: Loaded from cdrom.eeprom\n");
86 haveCDROMEEPROM = true;
89 WriteLog("EEPROM: Could not open file \"%s\"!\n", cdromEEPROMFilename);
93 void EepromReset(void)
96 memset(eeprom_ram, 0xFF, 64 * sizeof(uint16_t));
99 memset(cdromEEPROM, 0xFF, 64 * sizeof(uint16_t));
103 void EepromDone(void)
105 WriteLog("EEPROM: Done.\n");
109 static void EEPROMSave(void)
111 // Write out regular cartridge EEPROM data
112 FILE * fp = fopen(eeprom_filename, "wb");
116 fwrite(eeprom_ram, 1, 128, fp);
120 WriteLog("EEPROM: Could not create file \"%s!\"\n", eeprom_filename);
122 // Write out JagCD EEPROM data
123 fp = fopen(cdromEEPROMFilename, "wb");
127 fwrite(cdromEEPROM, 1, 128, fp);
131 WriteLog("EEPROM: Could not create file \"%s!\"\n", cdromEEPROMFilename);
135 uint8_t EepromReadByte(uint32_t offset)
140 return eeprom_get_do();
146 // default: WriteLog("EEPROM: unmapped 0x%.8x\n", offset); break;
153 uint16_t EepromReadWord(uint32_t offset)
155 return ((uint16_t)EepromReadByte(offset + 0) << 8) | EepromReadByte(offset + 1);
159 void EepromWriteByte(uint32_t offset, uint8_t data)
166 eeprom_set_di(data & 0x01);
171 // default: WriteLog("eeprom: unmapped 0x%.8x\n",offset); break;
176 void EepromWriteWord(uint32_t offset, uint16_t data)
178 EepromWriteByte(offset + 0, (data >> 8) & 0xFF);
179 EepromWriteByte(offset + 1, data & 0xFF);
185 ; Commands specific to the National Semiconductor NM93C14
190 eEWDS equ %100000000 ;Erase/Write disable (default)
191 eWRAL equ %100010000 ;Writes all registers
192 eERAL equ %100100000 ;Erase all registers
193 eEWEN equ %100110000 ;Erase/write Enable
194 eWRITE equ %101000000 ;Write selected register
195 eREAD equ %110000000 ;read from EEPROM
196 eERASE equ %111000000 ;Erase selected register
200 static void eeprom_set_di(uint32_t data)
202 // WriteLog("eeprom: di=%i\n",data);
203 // WriteLog("eeprom: state %i\n",jerry_ee_state);
204 switch (jerry_ee_state)
207 jerry_ee_state = EE_STATE_OP_A;
210 jerry_ee_op = (data << 1);
211 jerry_ee_state = EE_STATE_OP_B;
215 jerry_ee_direct_jump = 0;
216 // WriteLog("eeprom: opcode %i\n",jerry_ee_op);
220 // Opcode 00: eEWEN, eERAL, eWRAL, eEWNDS
221 case 0: jerry_ee_state = EE_STATE_0; break;
222 // Opcode 01: eWRITE (Write selected register)
223 case 1: jerry_ee_state = EE_STATE_1; break;
224 // Opcode 10: eREAD (Read from EEPROM)
225 case 2: jerry_ee_state = EE_STATE_2; break;
226 // Opcode 11: eERASE (Erase selected register)
227 case 3: jerry_ee_state = EE_STATE_3; break;
233 jerry_ee_rstate = EE_STATE_0_0;
234 jerry_ee_state = EE_READ_ADDRESS;
235 jerry_ee_direct_jump = 1;
236 jerry_ee_address_cnt = 6;
237 jerry_ee_address_data = 0;
240 switch ((jerry_ee_address_data >> 4) & 0x03)
242 // Opcode 00 00: eEWDS (Erase/Write disable)
243 case 0: jerry_ee_state=EE_STATE_0_0_0; break;
244 // Opcode 00 01: eWRAL (Write all registers)
245 case 1: jerry_ee_state=EE_STATE_0_0_1; break;
246 // Opcode 00 10: eERAL (Erase all registers)
247 case 2: jerry_ee_state=EE_STATE_0_0_2; break;
248 // Opcode 00 11: eEWEN (Erase/Write enable)
249 case 3: jerry_ee_state=EE_STATE_0_0_3; break;
256 // WriteLog("eeprom: read only\n");
257 jerry_writes_enabled = 0;
258 jerry_ee_state = EE_STATE_START;
262 jerry_ee_rstate = EE_STATE_0_0_1_0;
263 jerry_ee_state = EE_READ_DATA;
264 jerry_ee_data_cnt = 16;
266 jerry_ee_direct_jump = 1;
268 case EE_STATE_0_0_1_0:
269 // WriteLog("eeprom: filling eeprom with 0x%.4x\n",data);
270 if (jerry_writes_enabled)
272 for(int i=0; i<64; i++)
273 eeprom_ram[i] = jerry_ee_data;
275 EEPROMSave(); // Save it NOW!
279 // WriteLog("eeprom: not writing because read only\n");
280 jerry_ee_state = EE_STATE_BUSY;
284 //WriteLog("eeprom: erasing eeprom\n");
285 if (jerry_writes_enabled)
286 for(int i=0; i<64; i++)
287 eeprom_ram[i] = 0xFFFF;
289 jerry_ee_state = EE_STATE_BUSY;
293 //WriteLog("eeprom: read/write\n");
294 jerry_writes_enabled = 1;
295 jerry_ee_state = EE_STATE_START;
298 jerry_ee_rstate = EE_STATE_1_0;
299 jerry_ee_state = EE_READ_ADDRESS;
300 jerry_ee_address_cnt = 6;
301 jerry_ee_address_data = 0;
302 jerry_ee_direct_jump = 1;
305 jerry_ee_rstate = EE_STATE_1_1;
306 jerry_ee_state = EE_READ_DATA;
307 jerry_ee_data_cnt = 16;
309 jerry_ee_direct_jump = 1;
312 //WriteLog("eeprom: writing 0x%.4x at 0x%.2x\n",jerry_ee_data,jerry_ee_address_data);
313 if (jerry_writes_enabled)
315 eeprom_ram[jerry_ee_address_data] = jerry_ee_data;
316 EEPROMSave(); // Save it NOW!
319 jerry_ee_state = EE_STATE_BUSY;
322 jerry_ee_rstate = EE_STATE_2_0;
323 jerry_ee_state = EE_READ_ADDRESS;
324 jerry_ee_address_cnt = 6;
325 jerry_ee_address_data = 0;
326 jerry_ee_data_cnt = 16;
330 jerry_ee_rstate = EE_STATE_3_0;
331 jerry_ee_state = EE_READ_ADDRESS;
332 jerry_ee_address_cnt = 6;
333 jerry_ee_address_data = 0;
334 jerry_ee_direct_jump = 1;
337 //WriteLog("eeprom: erasing 0x%.2x\n",jerry_ee_address_data);
338 if (jerry_writes_enabled)
339 eeprom_ram[jerry_ee_address_data] = 0xFFFF;
341 jerry_ee_state = EE_STATE_BUSY;
344 //WriteLog("eeprom:\t\t\t%i bit %i\n",data,jerry_ee_data_cnt-1);
346 jerry_ee_data |= data;
349 if (!jerry_ee_data_cnt)
351 jerry_ee_state = jerry_ee_rstate;
353 if (jerry_ee_direct_jump)
358 case EE_READ_ADDRESS:
359 jerry_ee_address_data <<= 1;
360 jerry_ee_address_data |= data;
361 jerry_ee_address_cnt--;
362 // WriteLog("eeprom:\t%i bits remaining\n",jerry_ee_address_cnt);
364 if (!jerry_ee_address_cnt)
366 jerry_ee_state = jerry_ee_rstate;
367 //WriteLog("eeprom:\t\tread address 0x%.2x\n",jerry_ee_address_data);
369 if (jerry_ee_direct_jump)
375 jerry_ee_state = EE_STATE_OP_A;
380 static void eeprom_set_cs(uint32_t /*state*/)
382 // WriteLog("eeprom: cs=%i\n",state);
383 jerry_ee_state = EE_STATE_START;
386 jerry_ee_address_data = 0;
387 jerry_ee_address_cnt = 6;
389 jerry_ee_data_cnt = 16;
390 jerry_writes_enabled = 1;
394 static uint32_t eeprom_get_do(void)
398 switch (jerry_ee_state)
404 jerry_ee_state = EE_STATE_START;
410 data = (eeprom_ram[jerry_ee_address_data] & (1 << jerry_ee_data_cnt)) >> jerry_ee_data_cnt;
412 data = (eeprom_ram[jerry_ee_address_data] >> jerry_ee_data_cnt) & 0x01;
415 if (!jerry_ee_data_cnt)
417 //WriteLog("eeprom: read 0x%.4x at 0x%.2x cpu %i pc=0x%.8x\n",eeprom_ram[jerry_ee_address_data],jerry_ee_address_data,jaguar_cpu_in_exec,s68000readPC());
418 jerry_ee_state = EE_STATE_START;
423 // WriteLog("eeprom: do=%i\n",data);