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-rw-r--r--hw/eeprom93xx.c337
1 files changed, 0 insertions, 337 deletions
diff --git a/hw/eeprom93xx.c b/hw/eeprom93xx.c
deleted file mode 100644
index 39f560553d..0000000000
--- a/hw/eeprom93xx.c
+++ /dev/null
@@ -1,337 +0,0 @@
-/*
- * 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
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- */
-
-/* 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.
- */
-
-#include "hw/hw.h"
-#include "hw/eeprom93xx.h"
-
-/* Debug EEPROM emulation. */
-//~ #define DEBUG_EEPROM
-
-#ifdef DEBUG_EEPROM
-#define logout(fmt, ...) fprintf(stderr, "EEPROM\t%-24s" fmt, __func__, ## __VA_ARGS__)
-#else
-#define logout(fmt, ...) ((void)0)
-#endif
-
-#define EEPROM_INSTANCE 0
-#define OLD_EEPROM_VERSION 20061112
-#define EEPROM_VERSION (OLD_EEPROM_VERSION + 1)
-
-#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
-
-struct _eeprom_t {
- uint8_t tick;
- uint8_t address;
- uint8_t command;
- uint8_t writable;
-
- uint8_t eecs;
- uint8_t eesk;
- uint8_t eedo;
-
- uint8_t addrbits;
- uint16_t size;
- uint16_t data;
- uint16_t contents[0];
-};
-
-/* Code for saving and restoring of EEPROM state. */
-
-/* Restore an uint16_t from an uint8_t
- This is a Big hack, but it is how the old state did it.
- */
-
-static int get_uint16_from_uint8(QEMUFile *f, void *pv, size_t size)
-{
- uint16_t *v = pv;
- *v = qemu_get_ubyte(f);
- return 0;
-}
-
-static void put_unused(QEMUFile *f, void *pv, size_t size)
-{
- fprintf(stderr, "uint16_from_uint8 is used only for backwards compatibility.\n");
- fprintf(stderr, "Never should be used to write a new state.\n");
- exit(0);
-}
-
-static const VMStateInfo vmstate_hack_uint16_from_uint8 = {
- .name = "uint16_from_uint8",
- .get = get_uint16_from_uint8,
- .put = put_unused,
-};
-
-#define VMSTATE_UINT16_HACK_TEST(_f, _s, _t) \
- VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_hack_uint16_from_uint8, uint16_t)
-
-static bool is_old_eeprom_version(void *opaque, int version_id)
-{
- return version_id == OLD_EEPROM_VERSION;
-}
-
-static const VMStateDescription vmstate_eeprom = {
- .name = "eeprom",
- .version_id = EEPROM_VERSION,
- .minimum_version_id = OLD_EEPROM_VERSION,
- .minimum_version_id_old = OLD_EEPROM_VERSION,
- .fields = (VMStateField []) {
- VMSTATE_UINT8(tick, eeprom_t),
- VMSTATE_UINT8(address, eeprom_t),
- VMSTATE_UINT8(command, eeprom_t),
- VMSTATE_UINT8(writable, eeprom_t),
-
- VMSTATE_UINT8(eecs, eeprom_t),
- VMSTATE_UINT8(eesk, eeprom_t),
- VMSTATE_UINT8(eedo, eeprom_t),
-
- VMSTATE_UINT8(addrbits, eeprom_t),
- VMSTATE_UINT16_HACK_TEST(size, eeprom_t, is_old_eeprom_version),
- VMSTATE_UNUSED_TEST(is_old_eeprom_version, 1),
- VMSTATE_UINT16_EQUAL_V(size, eeprom_t, EEPROM_VERSION),
- VMSTATE_UINT16(data, eeprom_t),
- VMSTATE_VARRAY_UINT16_UNSAFE(contents, eeprom_t, size, 0,
- vmstate_info_uint16, uint16_t),
- VMSTATE_END_OF_LIST()
- }
-};
-
-void eeprom93xx_write(eeprom_t *eeprom, int eecs, int eesk, int eedi)
-{
- 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->writable) {
- 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->writable = 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->writable = 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;
-}
-
-uint16_t eeprom93xx_read(eeprom_t *eeprom)
-{
- /* 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
-
-eeprom_t *eeprom93xx_new(DeviceState *dev, uint16_t nwords)
-{
- /* Add a new EEPROM (with 16, 64 or 256 words). */
- eeprom_t *eeprom;
- 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;
- }
-
- eeprom = (eeprom_t *)g_malloc0(sizeof(*eeprom) + nwords * 2);
- 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);
- vmstate_register(dev, 0, &vmstate_eeprom, eeprom);
- return eeprom;
-}
-
-void eeprom93xx_free(DeviceState *dev, eeprom_t *eeprom)
-{
- /* Destroy EEPROM. */
- logout("eeprom = 0x%p\n", eeprom);
- vmstate_unregister(dev, &vmstate_eeprom, eeprom);
- g_free(eeprom);
-}
-
-uint16_t *eeprom93xx_data(eeprom_t *eeprom)
-{
- /* Get EEPROM data array. */
- return &eeprom->contents[0];
-}
-
-/* eof */
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