2007-04-02 14:35:34 +02:00
|
|
|
/*
|
|
|
|
* QEMU EEPROM 93xx emulation
|
|
|
|
*
|
|
|
|
* Copyright (c) 2006-2007 Stefan Weil
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License as published by
|
|
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
|
|
* (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public License
|
2009-07-16 22:47:01 +02:00
|
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
2007-04-02 14:35:34 +02:00
|
|
|
*/
|
|
|
|
|
|
|
|
/* Emulation for serial EEPROMs:
|
|
|
|
* NMC93C06 256-Bit (16 x 16)
|
|
|
|
* NMC93C46 1024-Bit (64 x 16)
|
|
|
|
* NMC93C56 2028 Bit (128 x 16)
|
|
|
|
* NMC93C66 4096 Bit (256 x 16)
|
|
|
|
* Compatible devices include FM93C46 and others.
|
|
|
|
*
|
|
|
|
* Other drivers use these interface functions:
|
|
|
|
* eeprom93xx_new - add a new EEPROM (with 16, 64 or 256 words)
|
|
|
|
* eeprom93xx_free - destroy EEPROM
|
|
|
|
* eeprom93xx_read - read data from the EEPROM
|
|
|
|
* eeprom93xx_write - write data to the EEPROM
|
|
|
|
* eeprom93xx_data - get EEPROM data array for external manipulation
|
|
|
|
*
|
|
|
|
* Todo list:
|
|
|
|
* - No emulation of EEPROM timings.
|
|
|
|
*/
|
|
|
|
|
2007-11-17 18:14:51 +01:00
|
|
|
#include "hw.h"
|
2007-04-02 14:35:34 +02:00
|
|
|
#include "eeprom93xx.h"
|
|
|
|
|
|
|
|
/* Debug EEPROM emulation. */
|
|
|
|
//~ #define DEBUG_EEPROM
|
|
|
|
|
|
|
|
#ifdef DEBUG_EEPROM
|
2009-05-13 19:53:17 +02:00
|
|
|
#define logout(fmt, ...) fprintf(stderr, "EEPROM\t%-24s" fmt, __func__, ## __VA_ARGS__)
|
2007-04-02 14:35:34 +02:00
|
|
|
#else
|
2009-05-13 19:53:17 +02:00
|
|
|
#define logout(fmt, ...) ((void)0)
|
2007-04-02 14:35:34 +02:00
|
|
|
#endif
|
|
|
|
|
2009-03-29 00:14:52 +01:00
|
|
|
#define EEPROM_INSTANCE 0
|
|
|
|
#define OLD_EEPROM_VERSION 20061112
|
|
|
|
#define EEPROM_VERSION (OLD_EEPROM_VERSION + 1)
|
2007-04-02 14:35:34 +02:00
|
|
|
|
|
|
|
#if 0
|
|
|
|
typedef enum {
|
|
|
|
eeprom_read = 0x80, /* read register xx */
|
|
|
|
eeprom_write = 0x40, /* write register xx */
|
|
|
|
eeprom_erase = 0xc0, /* erase register xx */
|
|
|
|
eeprom_ewen = 0x30, /* erase / write enable */
|
|
|
|
eeprom_ewds = 0x00, /* erase / write disable */
|
|
|
|
eeprom_eral = 0x20, /* erase all registers */
|
|
|
|
eeprom_wral = 0x10, /* write all registers */
|
|
|
|
eeprom_amask = 0x0f,
|
|
|
|
eeprom_imask = 0xf0
|
|
|
|
} eeprom_instruction_t;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef DEBUG_EEPROM
|
|
|
|
static const char *opstring[] = {
|
|
|
|
"extended", "write", "read", "erase"
|
|
|
|
};
|
|
|
|
#endif
|
|
|
|
|
2009-10-01 20:20:47 +02:00
|
|
|
struct eeprom {
|
2007-04-02 14:35:34 +02:00
|
|
|
uint8_t tick;
|
|
|
|
uint8_t address;
|
|
|
|
uint8_t command;
|
|
|
|
uint8_t writeable;
|
|
|
|
|
|
|
|
uint8_t eecs;
|
|
|
|
uint8_t eesk;
|
|
|
|
uint8_t eedo;
|
|
|
|
|
|
|
|
uint8_t addrbits;
|
2009-03-29 00:14:52 +01:00
|
|
|
uint16_t size;
|
2007-04-02 14:35:34 +02:00
|
|
|
uint16_t data;
|
|
|
|
uint16_t contents[0];
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Code for saving and restoring of EEPROM state. */
|
|
|
|
|
|
|
|
static void eeprom_save(QEMUFile *f, void *opaque)
|
|
|
|
{
|
|
|
|
/* Save EEPROM data. */
|
|
|
|
unsigned address;
|
2009-10-01 20:20:47 +02:00
|
|
|
a_eeprom *eeprom = (a_eeprom *)opaque;
|
2009-03-29 00:14:41 +01:00
|
|
|
|
|
|
|
qemu_put_byte(f, eeprom->tick);
|
|
|
|
qemu_put_byte(f, eeprom->address);
|
|
|
|
qemu_put_byte(f, eeprom->command);
|
|
|
|
qemu_put_byte(f, eeprom->writeable);
|
|
|
|
|
|
|
|
qemu_put_byte(f, eeprom->eecs);
|
|
|
|
qemu_put_byte(f, eeprom->eesk);
|
|
|
|
qemu_put_byte(f, eeprom->eedo);
|
|
|
|
|
|
|
|
qemu_put_byte(f, eeprom->addrbits);
|
2009-03-29 00:14:52 +01:00
|
|
|
qemu_put_be16(f, eeprom->size);
|
2007-04-02 14:35:34 +02:00
|
|
|
qemu_put_be16(f, eeprom->data);
|
|
|
|
for (address = 0; address < eeprom->size; address++) {
|
|
|
|
qemu_put_be16(f, eeprom->contents[address]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int eeprom_load(QEMUFile *f, void *opaque, int version_id)
|
|
|
|
{
|
|
|
|
/* Load EEPROM data from saved data if version and EEPROM size
|
|
|
|
of data and current EEPROM are identical. */
|
2009-10-01 20:20:47 +02:00
|
|
|
a_eeprom *eeprom = (a_eeprom *)opaque;
|
2007-04-02 14:35:34 +02:00
|
|
|
int result = -EINVAL;
|
2009-03-29 00:14:52 +01:00
|
|
|
if (version_id >= OLD_EEPROM_VERSION) {
|
2007-04-02 14:35:34 +02:00
|
|
|
unsigned address;
|
2009-03-29 00:14:52 +01:00
|
|
|
int size = eeprom->size;
|
2009-03-29 00:14:41 +01:00
|
|
|
|
|
|
|
eeprom->tick = qemu_get_byte(f);
|
|
|
|
eeprom->address = qemu_get_byte(f);
|
|
|
|
eeprom->command = qemu_get_byte(f);
|
|
|
|
eeprom->writeable = qemu_get_byte(f);
|
|
|
|
|
|
|
|
eeprom->eecs = qemu_get_byte(f);
|
|
|
|
eeprom->eesk = qemu_get_byte(f);
|
|
|
|
eeprom->eedo = qemu_get_byte(f);
|
|
|
|
|
|
|
|
eeprom->addrbits = qemu_get_byte(f);
|
2009-03-29 00:14:52 +01:00
|
|
|
if (version_id == OLD_EEPROM_VERSION) {
|
|
|
|
eeprom->size = qemu_get_byte(f);
|
|
|
|
qemu_get_byte(f);
|
|
|
|
} else {
|
|
|
|
eeprom->size = qemu_get_be16(f);
|
|
|
|
}
|
2009-03-29 00:14:41 +01:00
|
|
|
|
2007-04-02 14:35:34 +02:00
|
|
|
if (eeprom->size == size) {
|
|
|
|
eeprom->data = qemu_get_be16(f);
|
|
|
|
for (address = 0; address < eeprom->size; address++) {
|
|
|
|
eeprom->contents[address] = qemu_get_be16(f);
|
|
|
|
}
|
|
|
|
result = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
2009-10-01 20:20:47 +02:00
|
|
|
void eeprom93xx_write(a_eeprom *eeprom, int eecs, int eesk, int eedi)
|
2007-04-02 14:35:34 +02:00
|
|
|
{
|
|
|
|
uint8_t tick = eeprom->tick;
|
|
|
|
uint8_t eedo = eeprom->eedo;
|
|
|
|
uint16_t address = eeprom->address;
|
|
|
|
uint8_t command = eeprom->command;
|
|
|
|
|
|
|
|
logout("CS=%u SK=%u DI=%u DO=%u, tick = %u\n",
|
|
|
|
eecs, eesk, eedi, eedo, tick);
|
|
|
|
|
|
|
|
if (! eeprom->eecs && eecs) {
|
|
|
|
/* Start chip select cycle. */
|
|
|
|
logout("Cycle start, waiting for 1st start bit (0)\n");
|
|
|
|
tick = 0;
|
|
|
|
command = 0x0;
|
|
|
|
address = 0x0;
|
|
|
|
} else if (eeprom->eecs && ! eecs) {
|
|
|
|
/* End chip select cycle. This triggers write / erase. */
|
|
|
|
if (eeprom->writeable) {
|
|
|
|
uint8_t subcommand = address >> (eeprom->addrbits - 2);
|
|
|
|
if (command == 0 && subcommand == 2) {
|
|
|
|
/* Erase all. */
|
|
|
|
for (address = 0; address < eeprom->size; address++) {
|
|
|
|
eeprom->contents[address] = 0xffff;
|
|
|
|
}
|
|
|
|
} else if (command == 3) {
|
|
|
|
/* Erase word. */
|
|
|
|
eeprom->contents[address] = 0xffff;
|
|
|
|
} else if (tick >= 2 + 2 + eeprom->addrbits + 16) {
|
|
|
|
if (command == 1) {
|
|
|
|
/* Write word. */
|
|
|
|
eeprom->contents[address] &= eeprom->data;
|
|
|
|
} else if (command == 0 && subcommand == 1) {
|
|
|
|
/* Write all. */
|
|
|
|
for (address = 0; address < eeprom->size; address++) {
|
|
|
|
eeprom->contents[address] &= eeprom->data;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* Output DO is tristate, read results in 1. */
|
|
|
|
eedo = 1;
|
|
|
|
} else if (eecs && ! eeprom->eesk && eesk) {
|
|
|
|
/* Raising edge of clock shifts data in. */
|
|
|
|
if (tick == 0) {
|
|
|
|
/* Wait for 1st start bit. */
|
|
|
|
if (eedi == 0) {
|
|
|
|
logout("Got correct 1st start bit, waiting for 2nd start bit (1)\n");
|
|
|
|
tick++;
|
|
|
|
} else {
|
|
|
|
logout("wrong 1st start bit (is 1, should be 0)\n");
|
|
|
|
tick = 2;
|
|
|
|
//~ assert(!"wrong start bit");
|
|
|
|
}
|
|
|
|
} else if (tick == 1) {
|
|
|
|
/* Wait for 2nd start bit. */
|
|
|
|
if (eedi != 0) {
|
|
|
|
logout("Got correct 2nd start bit, getting command + address\n");
|
|
|
|
tick++;
|
|
|
|
} else {
|
|
|
|
logout("1st start bit is longer than needed\n");
|
|
|
|
}
|
|
|
|
} else if (tick < 2 + 2) {
|
|
|
|
/* Got 2 start bits, transfer 2 opcode bits. */
|
|
|
|
tick++;
|
|
|
|
command <<= 1;
|
|
|
|
if (eedi) {
|
|
|
|
command += 1;
|
|
|
|
}
|
|
|
|
} else if (tick < 2 + 2 + eeprom->addrbits) {
|
|
|
|
/* Got 2 start bits and 2 opcode bits, transfer all address bits. */
|
|
|
|
tick++;
|
|
|
|
address = ((address << 1) | eedi);
|
|
|
|
if (tick == 2 + 2 + eeprom->addrbits) {
|
|
|
|
logout("%s command, address = 0x%02x (value 0x%04x)\n",
|
|
|
|
opstring[command], address, eeprom->contents[address]);
|
|
|
|
if (command == 2) {
|
|
|
|
eedo = 0;
|
|
|
|
}
|
|
|
|
address = address % eeprom->size;
|
|
|
|
if (command == 0) {
|
|
|
|
/* Command code in upper 2 bits of address. */
|
|
|
|
switch (address >> (eeprom->addrbits - 2)) {
|
|
|
|
case 0:
|
|
|
|
logout("write disable command\n");
|
|
|
|
eeprom->writeable = 0;
|
|
|
|
break;
|
|
|
|
case 1:
|
|
|
|
logout("write all command\n");
|
|
|
|
break;
|
|
|
|
case 2:
|
|
|
|
logout("erase all command\n");
|
|
|
|
break;
|
|
|
|
case 3:
|
|
|
|
logout("write enable command\n");
|
|
|
|
eeprom->writeable = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* Read, write or erase word. */
|
|
|
|
eeprom->data = eeprom->contents[address];
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else if (tick < 2 + 2 + eeprom->addrbits + 16) {
|
|
|
|
/* Transfer 16 data bits. */
|
|
|
|
tick++;
|
|
|
|
if (command == 2) {
|
|
|
|
/* Read word. */
|
|
|
|
eedo = ((eeprom->data & 0x8000) != 0);
|
|
|
|
}
|
|
|
|
eeprom->data <<= 1;
|
|
|
|
eeprom->data += eedi;
|
|
|
|
} else {
|
|
|
|
logout("additional unneeded tick, not processed\n");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* Save status of EEPROM. */
|
|
|
|
eeprom->tick = tick;
|
|
|
|
eeprom->eecs = eecs;
|
|
|
|
eeprom->eesk = eesk;
|
|
|
|
eeprom->eedo = eedo;
|
|
|
|
eeprom->address = address;
|
|
|
|
eeprom->command = command;
|
|
|
|
}
|
|
|
|
|
2009-10-01 20:20:47 +02:00
|
|
|
uint16_t eeprom93xx_read(a_eeprom *eeprom)
|
2007-04-02 14:35:34 +02:00
|
|
|
{
|
|
|
|
/* Return status of pin DO (0 or 1). */
|
|
|
|
logout("CS=%u DO=%u\n", eeprom->eecs, eeprom->eedo);
|
|
|
|
return (eeprom->eedo);
|
|
|
|
}
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
void eeprom93xx_reset(eeprom_t *eeprom)
|
|
|
|
{
|
|
|
|
/* prepare eeprom */
|
|
|
|
logout("eeprom = 0x%p\n", eeprom);
|
|
|
|
eeprom->tick = 0;
|
|
|
|
eeprom->command = 0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2009-10-01 20:20:47 +02:00
|
|
|
a_eeprom *eeprom93xx_new(uint16_t nwords)
|
2007-04-02 14:35:34 +02:00
|
|
|
{
|
|
|
|
/* Add a new EEPROM (with 16, 64 or 256 words). */
|
2009-10-01 20:20:47 +02:00
|
|
|
a_eeprom *eeprom;
|
2007-04-02 14:35:34 +02:00
|
|
|
uint8_t addrbits;
|
|
|
|
|
|
|
|
switch (nwords) {
|
|
|
|
case 16:
|
|
|
|
case 64:
|
|
|
|
addrbits = 6;
|
|
|
|
break;
|
|
|
|
case 128:
|
|
|
|
case 256:
|
|
|
|
addrbits = 8;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
assert(!"Unsupported EEPROM size, fallback to 64 words!");
|
|
|
|
nwords = 64;
|
|
|
|
addrbits = 6;
|
|
|
|
}
|
|
|
|
|
2009-10-01 20:20:47 +02:00
|
|
|
eeprom = (a_eeprom *)qemu_mallocz(sizeof(*eeprom) + nwords * 2);
|
2007-04-02 14:35:34 +02:00
|
|
|
eeprom->size = nwords;
|
|
|
|
eeprom->addrbits = addrbits;
|
|
|
|
/* Output DO is tristate, read results in 1. */
|
|
|
|
eeprom->eedo = 1;
|
|
|
|
logout("eeprom = 0x%p, nwords = %u\n", eeprom, nwords);
|
2009-03-29 00:14:52 +01:00
|
|
|
register_savevm("eeprom", EEPROM_INSTANCE, EEPROM_VERSION,
|
2007-04-02 14:35:34 +02:00
|
|
|
eeprom_save, eeprom_load, eeprom);
|
|
|
|
return eeprom;
|
|
|
|
}
|
|
|
|
|
2009-10-01 20:20:47 +02:00
|
|
|
void eeprom93xx_free(a_eeprom *eeprom)
|
2007-04-02 14:35:34 +02:00
|
|
|
{
|
|
|
|
/* Destroy EEPROM. */
|
|
|
|
logout("eeprom = 0x%p\n", eeprom);
|
2009-07-02 00:06:19 +02:00
|
|
|
unregister_savevm("eeprom", eeprom);
|
2007-04-02 14:35:34 +02:00
|
|
|
qemu_free(eeprom);
|
|
|
|
}
|
|
|
|
|
2009-10-01 20:20:47 +02:00
|
|
|
uint16_t *eeprom93xx_data(a_eeprom *eeprom)
|
2007-04-02 14:35:34 +02:00
|
|
|
{
|
|
|
|
/* Get EEPROM data array. */
|
|
|
|
return &eeprom->contents[0];
|
|
|
|
}
|
|
|
|
|
|
|
|
/* eof */
|