repos/blastem: nor.c annotate

annotate nor.c @ 1971:80920c21bb52

Add an event log soft flush and call it twice per frame in between hard flushes to netplay latency when there are insufficient hardware updates to flush packets in the middle of a frame

author	Michael Pavone <pavone@retrodev.com>
date	Fri, 08 May 2020 11:40:30 -0700
parents	1f745318f10a
children	d74d3998482c

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 }

Mercurial > repos > blastem

annotate nor.c @ 1971:80920c21bb52