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ca37758018
This patch rewrites the nmc93cxx emulation code. The primary aim of the rewrite is to fix the Qlogic 1080 BIOS v1.11 flashing feature (the card utilizes a 93C56 chip in 128x16 mode). This work is derived from the MAME serial EEPROM emulation code written by Aaron Giles and published under BSD-3-Clause license. https://github.com/mamedev/mame/blob/master/src/devices/machine/eepromser.cpp The code is modelled on the MAME code with the following differences: - Removed support for the ER5911 and MSM16911 EEPROM devices. - Removed support for the X24C44 NOVRAM device. - Removed support for the Seiko S-29X90 EEPROM devices. The 86Box changes: - The nmc93cxx code now also supports EEPROM devices in 8-bit mode. - Make the default_content parameter optional. - Make the nmc93cxx_eeprom_data function to return a const pointer.
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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*
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* Header of the emulation of the National Semiconductors NMC93Cxx EEPROMs
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* (16 bits or 8 bits).
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*
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* Authors: Cacodemon345
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*
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* Copyright 2023 Cacodemon345
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*/
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#pragma once
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/* Forward declaration to hide internal device state from users. */
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typedef struct nmc93cxx_eeprom_t nmc93cxx_eeprom_t;
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/* EEPROM device type used to specify the size of data array. */
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typedef enum nmc93cxx_eeprom_type {
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/*
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* Standard 93CX6 class of 16-bit EEPROMs.
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*
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* Type / Bits per cell / Number of cells
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*/
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NMC_93C06_x16_16,
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NMC_93C46_x16_64,
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NMC_93C56_x16_128,
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NMC_93C57_x16_128,
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NMC_93C66_x16_256,
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NMC_93C76_x16_512,
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NMC_93C86_x16_1024,
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/*
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* Some manufacturers use pin 6 as an "ORG" pin which,
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* when pulled low, configures memory for 8-bit accesses.
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*
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* Type / Bits per cell / Number of cells
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*/
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NMC_93C46_x8_128,
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NMC_93C56_x8_256,
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NMC_93C57_x8_256,
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NMC_93C66_x8_512,
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NMC_93C76_x8_1024,
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NMC_93C86_x8_2048,
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} nmc93cxx_eeprom_type;
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/* EEPROM device parameters. */
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typedef struct nmc93cxx_eeprom_params_t {
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/* Device type */
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nmc93cxx_eeprom_type type;
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/* Name of EEPROM image file */
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const char *filename;
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/*
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* Optional pointer to the default data buffer.
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* The buffer size should match the size of EEPROM data array specified by nmc93cxx_eeprom_type.
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*/
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const void *default_content;
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} nmc93cxx_eeprom_params_t;
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/* Read the state of the data output (DO) line. */
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bool nmc93cxx_eeprom_read(nmc93cxx_eeprom_t *dev);
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/* Set the state of the input lines. */
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void nmc93cxx_eeprom_write(nmc93cxx_eeprom_t *dev, bool eecs, bool eesk, bool eedi);
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/* Returns pointer to the current EEPROM data array. */
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const uint16_t *nmc93cxx_eeprom_data(nmc93cxx_eeprom_t *dev);
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extern const device_t nmc93cxx_device;
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