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// license:BSD-3-Clause
// copyright-holders:David Haywood
#include "emu.h"
#include "generic_spi_flash.h"
#define LOG_SPI (1U << 1)
#define VERBOSE (0)
#include "logmacro.h"
DEFINE_DEVICE_TYPE(GENERIC_SPI_FLASH, generic_spi_flash_device, "generic_spi_flash", "Generic SPI Flash handling")
generic_spi_flash_device::generic_spi_flash_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, GENERIC_SPI_FLASH, tag, owner, clock)
, device_nvram_interface(mconfig, *this)
{
}
void generic_spi_flash_device::device_start()
{
save_item(NAME(m_spiaddr));
save_item(NAME(m_spi_state));
save_item(NAME(m_spilatch));
save_item(NAME(m_spidir));
}
void generic_spi_flash_device::device_reset()
{
m_spiaddr = 0;
m_spi_state = 0;
m_spilatch = 0;
m_spidir = false;
}
void generic_spi_flash_device::write(uint8_t data)
{
if (!m_spidir) // Send to SPI
{
switch (m_spi_state)
{
case READY_FOR_COMMAND:
if (data == 0x03)
{
m_spi_state = READY_FOR_ADDRESS2;
}
else if (data == 0x05)
{
m_spi_state = READY_FOR_STATUS_READ;
}
else if (data == 0x0b)
{
m_spi_state = READY_FOR_HSADDRESS2;
}
else if (data == 0x06)
{
// write enable
m_spi_state = READY_FOR_COMMAND;
}
else if (data == 0x04)
{
// write disable
m_spi_state = READY_FOR_COMMAND;
}
else if (data == 0x02)
{
// page program
m_spi_state = READY_FOR_WRITEADDRESS2;
}
else if (data == 0x20)
{
// erase 4k sector
m_spi_state = READY_FOR_COMMAND;
}
else
{
fatalerror("SPI set to unknown mode %02x\n", data);
}
break;
case READY_FOR_WRITEADDRESS2:
m_spiaddr = (m_spiaddr & 0x00ffff) | (data << 16);
m_spi_state = READY_FOR_WRITEADDRESS1;
break;
case READY_FOR_WRITEADDRESS1:
m_spiaddr = (m_spiaddr & 0xff00ff) | (data << 8);
m_spi_state = READY_FOR_WRITEADDRESS0;
break;
case READY_FOR_WRITEADDRESS0:
m_spiaddr = (m_spiaddr & 0xffff00) | (data);
m_spi_state = READY_FOR_WRITE;
LOGMASKED(LOG_SPI, "SPI set to page WRITE mode with address %08x\n", m_spiaddr);
break;
case READY_FOR_WRITE:
LOGMASKED(LOG_SPI, "Write SPI data %02x\n", data);
m_spiptr[(m_spiaddr++) & (m_length-1)] = data;
break;
case READY_FOR_ADDRESS2:
m_spiaddr = (m_spiaddr & 0x00ffff) | (data << 16);
m_spi_state = READY_FOR_ADDRESS1;
break;
case READY_FOR_ADDRESS1:
m_spiaddr = (m_spiaddr & 0xff00ff) | (data << 8);
m_spi_state = READY_FOR_ADDRESS0;
break;
case READY_FOR_ADDRESS0:
m_spiaddr = (m_spiaddr & 0xffff00) | (data);
m_spi_state = READY_FOR_READ;
m_spidir = 1;
LOGMASKED(LOG_SPI, "SPI set to READ mode with address %08x\n", m_spiaddr);
break;
case READY_FOR_HSADDRESS2:
m_spiaddr = (m_spiaddr & 0x00ffff) | (data << 16);
m_spi_state = READY_FOR_HSADDRESS1;
break;
case READY_FOR_HSADDRESS1:
m_spiaddr = (m_spiaddr & 0xff00ff) | (data << 8);
m_spi_state = READY_FOR_HSADDRESS0;
break;
case READY_FOR_HSADDRESS0:
m_spiaddr = (m_spiaddr & 0xffff00) | (data);
m_spi_state = READY_FOR_HSDUMMY;
break;
case READY_FOR_HSDUMMY:
m_spi_state = READY_FOR_READ;
m_spidir = 1;
LOGMASKED(LOG_SPI, "SPI set to High Speed READ mode with address %08x\n", m_spiaddr);
break;
case READY_FOR_SECTORERASEADDRESS2:
m_spiaddr = (m_spiaddr & 0x00ffff) | (data << 16);
m_spi_state = READY_FOR_SECTORERASEADDRESS1;
break;
case READY_FOR_SECTORERASEADDRESS1:
m_spiaddr = (m_spiaddr & 0xff00ff) | (data << 8);
m_spi_state = READY_FOR_SECTORERASEADDRESS0;
break;
case READY_FOR_SECTORERASEADDRESS0:
m_spiaddr = (m_spiaddr & 0xffff00) | (data);
LOGMASKED(LOG_SPI, "SPI set to Erase Sector with address %08x\n", m_spiaddr);
break;
}
}
else
{
if (m_spi_state == READY_FOR_READ)
{
m_spilatch = m_spiptr[(m_spiaddr++) & (m_length-1)];
}
else if (m_spi_state == READY_FOR_STATUS_READ)
{
m_spilatch = 0x00;
}
else
{
m_spilatch = 0x00;
}
}
}
void generic_spi_flash_device::nvram_default()
{
}
bool generic_spi_flash_device::nvram_read(util::read_stream &file)
{
if (m_spiptr == nullptr)
{
return false;
}
auto const [err, actual] = util::read(file, m_spiptr, m_length);
return !err && (actual == m_length);
}
bool generic_spi_flash_device::nvram_write(util::write_stream &file)
{
auto const [err, actual] = util::write(file, m_spiptr, m_length);
return !err;
}
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