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Diffstat (limited to 'src/devices/machine/eeprom.h')
-rw-r--r-- | src/devices/machine/eeprom.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/src/devices/machine/eeprom.h b/src/devices/machine/eeprom.h new file mode 100644 index 00000000000..d6db74f5a21 --- /dev/null +++ b/src/devices/machine/eeprom.h @@ -0,0 +1,116 @@ +// license:BSD-3-Clause +// copyright-holders:Aaron Giles +/*************************************************************************** + + eeprom.h + + Base class for EEPROM devices. + +***************************************************************************/ + +#pragma once + +#ifndef __EEPROM_H__ +#define __EEPROM_H__ + + + +//************************************************************************** +// INTERFACE CONFIGURATION MACROS +//************************************************************************** + +#define MCFG_EEPROM_SIZE(_cells, _cellbits) \ + eeprom_base_device::static_set_size(*device, _cells, _cellbits); +#define MCFG_EEPROM_DATA(_data, _size) \ + eeprom_base_device::static_set_default_data(*device, _data, _size); +#define MCFG_EEPROM_DEFAULT_VALUE(_value) \ + eeprom_base_device::static_set_default_value(*device, _value); + +#define MCFG_EEPROM_WRITE_TIME(_value) \ + eeprom_base_device::static_set_timing(*device, eeprom_base_device::WRITE_TIME, _value); +#define MCFG_EEPROM_WRITE_ALL_TIME(_value) \ + eeprom_base_device::static_set_timing(*device, eeprom_base_device::WRITE_ALL_TIME, _value); +#define MCFG_EEPROM_ERASE_TIME(_value) \ + eeprom_base_device::static_set_timing(*device, eeprom_base_device::ERASE_TIME, _value); +#define MCFG_EEPROM_ERASE_ALL_TIME(_value) \ + eeprom_base_device::static_set_timing(*device, eeprom_base_device::ERASE_ALL_TIME, _value); + + + +//************************************************************************** +// TYPE DEFINITIONS +//************************************************************************** + +// ======================> eeprom_base_device + +class eeprom_base_device : public device_t, + public device_memory_interface, + public device_nvram_interface +{ +protected: + // construction/destruction + eeprom_base_device(const machine_config &mconfig, device_type devtype, const char *name, const char *tag, device_t *owner, const char *shortname, const char *file); + +public: + // timing constants + enum timing_type + { + WRITE_TIME, // default = 2ms + WRITE_ALL_TIME, // default = 8ms + ERASE_TIME, // default = 1ms + ERASE_ALL_TIME, // default = 8ms + TIMING_COUNT + }; + + // inline configuration helpers + static void static_set_size(device_t &device, int cells, int cellbits); + static void static_set_default_data(device_t &device, const UINT8 *data, UINT32 size); + static void static_set_default_data(device_t &device, const UINT16 *data, UINT32 size); + static void static_set_default_value(device_t &device, UINT32 value); + static void static_set_timing(device_t &device, timing_type type, const attotime &duration); + + // read/write/erase data + UINT32 read(offs_t address); + void write(offs_t address, UINT32 data); + void write_all(UINT32 data); + void erase(offs_t address); + void erase_all(); + + // status + bool ready() const { return machine().time() >= m_completion_time; } + +protected: + // device-level overrides + virtual void device_validity_check(validity_checker &valid) const; + virtual void device_start(); + virtual void device_reset(); + + // device_memory_interface overrides + virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const; + + // device_nvram_interface overrides + virtual void nvram_default(); + virtual void nvram_read(emu_file &file); + virtual void nvram_write(emu_file &file); + + // internal read/write without side-effects + UINT32 internal_read(offs_t address); + void internal_write(offs_t address, UINT32 data); + + // configuration state + UINT32 m_cells; + UINT8 m_address_bits; + UINT8 m_data_bits; + address_space_config m_space_config; + generic_ptr m_default_data; + UINT32 m_default_data_size; + UINT32 m_default_value; + bool m_default_value_set; + attotime m_operation_time[TIMING_COUNT]; + + // live state + attotime m_completion_time; +}; + + +#endif |