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/**********************************************************************
Western Digital WD2010 Winchester Disk Controller
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************/
#include "machine/wd2010.h"
//**************************************************************************
// MACROS / CONSTANTS
//**************************************************************************
#define LOG 1
// task file
enum
{
TASK_FILE_ERROR = 1,
TASK_FILE_WRITE_PRECOMP_CYLINDER = TASK_FILE_ERROR,
TASK_FILE_SECTOR_COUNT,
TASK_FILE_SECTOR_NUMBER,
TASK_FILE_CYLINDER_LOW,
TASK_FILE_CYLINDER_HIGH,
TASK_FILE_SDH_REGISTER,
TASK_FILE_STATUS,
TASK_FILE_COMMAND = TASK_FILE_STATUS
};
#define WRITE_PRECOMP_CYLINDER \
(m_task_file[TASK_FILE_WRITE_PRECOMP_CYLINDER] * 4)
#define SECTOR_COUNT \
((m_task_file[TASK_FILE_SECTOR_COUNT] + 1) * 256)
#define SECTOR_NUMBER \
(m_task_file[TASK_FILE_SECTOR_NUMBER])
#define CYLINDER \
(((m_task_file[TASK_FILE_CYLINDER_HIGH] & 0x07) << 8) | m_task_file[TASK_FILE_CYLINDER_LOW])
#define HEAD \
(m_task_file[TASK_FILE_SDH_REGISTER] & 0x07)
#define DRIVE \
((m_task_file[TASK_FILE_SDH_REGISTER] >> 3) & 0x03)
static const int SECTOR_SIZES[4] = { 256, 512, 1024, 128 };
#define SECTOR_SIZE \
SECTOR_SIZES[(m_task_file[TASK_FILE_SDH_REGISTER] >> 5) & 0x03]
// status register
#define STATUS_BSY 0x80
#define STATUS_RDY 0x40
#define STATUS_WF 0x20
#define STATUS_SC 0x10
#define STATUS_DRQ 0x08
#define STATUS_DWC 0x04
#define STATUS_CIP 0x02
#define STATUS_ERR 0x01
// error register
#define ERROR_BB 0x80
#define ERROR_CRC_ECC 0x40
#define ERROR_ID 0x10
#define ERROR_AC 0x04
#define ERROR_TK 0x02
#define ERROR_DM 0x01
// command register
#define COMMAND_MASK 0xf0
#define COMMAND_RESTORE 0x10
#define COMMAND_SEEK 0x70
#define COMMAND_READ_SECTOR 0x20
#define COMMAND_WRITE_SECTOR 0x30
#define COMMAND_SCAN_ID 0x40
#define COMMAND_WRITE_FORMAT 0x50
#define COMMAND_COMPUTE_CORRECTION 0x08
#define COMMAND_SET_PARAMETER_MASK 0xfe
#define COMMAND_SET_PARAMETER 0x00
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
const device_type WD2010 = &device_creator<wd2010_device>;
//-------------------------------------------------
// device_config_complete - perform any
// operations now that the configuration is
// complete
//-------------------------------------------------
void wd2010_device::device_config_complete()
{
// inherit a copy of the static data
const wd2010_interface *intf = reinterpret_cast<const wd2010_interface *>(static_config());
if (intf != NULL)
*static_cast<wd2010_interface *>(this) = *intf;
// or initialize to defaults if none provided
else
{
memset(&m_out_intrq_cb, 0, sizeof(m_out_intrq_cb));
memset(&m_out_bdrq_cb, 0, sizeof(m_out_bdrq_cb));
memset(&m_out_bcr_cb, 0, sizeof(m_out_bcr_cb));
memset(&m_in_bcs_cb, 0, sizeof(m_in_bcs_cb));
memset(&m_out_bcs_cb, 0, sizeof(m_out_bcs_cb));
memset(&m_out_dirin_cb, 0, sizeof(m_out_dirin_cb));
memset(&m_out_step_cb, 0, sizeof(m_out_step_cb));
memset(&m_out_rwc_cb, 0, sizeof(m_out_rwc_cb));
memset(&m_in_drdy_cb, 0, sizeof(m_in_drdy_cb));
memset(&m_in_index_cb, 0, sizeof(m_in_index_cb));
memset(&m_in_wf_cb, 0, sizeof(m_in_wf_cb));
memset(&m_in_tk000_cb, 0, sizeof(m_in_tk000_cb));
memset(&m_in_sc_cb, 0, sizeof(m_in_sc_cb));
}
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// wd2010_device - constructor
//-------------------------------------------------
wd2010_device::wd2010_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, WD2010, "Western Digital WD2010", tag, owner, clock, "wd2010", __FILE__),
m_status(0),
m_error(0)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void wd2010_device::device_start()
{
// resolve callbacks
m_out_intrq_func.resolve(m_out_intrq_cb, *this);
m_out_bdrq_func.resolve(m_out_bdrq_cb, *this);
m_out_bcr_func.resolve(m_out_bcr_cb, *this);
m_in_bcs_func.resolve(m_in_bcs_cb, *this);
m_out_bcs_func.resolve(m_out_bcs_cb, *this);
m_out_dirin_func.resolve(m_out_dirin_cb, *this);
m_out_step_func.resolve(m_out_step_cb, *this);
m_out_rwc_func.resolve(m_out_rwc_cb, *this);
m_in_drdy_func.resolve(m_in_drdy_cb, *this);
m_in_index_func.resolve(m_in_index_cb, *this);
m_in_wf_func.resolve(m_in_wf_cb, *this);
m_in_tk000_func.resolve(m_in_tk000_cb, *this);
m_in_sc_func.resolve(m_in_sc_cb, *this);
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void wd2010_device::device_reset()
{
}
//-------------------------------------------------
// read -
//-------------------------------------------------
READ8_MEMBER( wd2010_device::read )
{
UINT8 data = 0;
switch (offset)
{
case TASK_FILE_ERROR:
data = m_error;
break;
case TASK_FILE_STATUS:
m_out_intrq_func(CLEAR_LINE);
data = m_status | STATUS_RDY | STATUS_SC;
break;
default:
data = m_task_file[offset];
break;
}
return data;
}
//-------------------------------------------------
// write -
//-------------------------------------------------
WRITE8_MEMBER( wd2010_device::write )
{
m_task_file[offset] = data;
switch (offset)
{
case TASK_FILE_WRITE_PRECOMP_CYLINDER:
if (LOG) logerror("%s WD2010 '%s' Write Precomp Cylinder: %u\n", machine().describe_context(), tag(), WRITE_PRECOMP_CYLINDER);
break;
case TASK_FILE_SECTOR_COUNT:
if (LOG) logerror("%s WD2010 '%s' Sector Count: %u\n", machine().describe_context(), tag(), SECTOR_COUNT);
break;
case TASK_FILE_SECTOR_NUMBER:
if (LOG) logerror("%s WD2010 '%s' Sector Number: %u\n", machine().describe_context(), tag(), SECTOR_NUMBER);
break;
case TASK_FILE_CYLINDER_LOW:
if (LOG) logerror("%s WD2010 '%s' Cylinder Low: %u\n", machine().describe_context(), tag(), CYLINDER);
break;
case TASK_FILE_CYLINDER_HIGH:
if (LOG) logerror("%s WD2010 '%s' Cylinder Low: %u\n", machine().describe_context(), tag(), CYLINDER);
break;
case TASK_FILE_SDH_REGISTER:
if (LOG)
{
logerror("%s WD2010 '%s' Head: %u\n", machine().describe_context(), tag(), HEAD);
logerror("%s WD2010 '%s' Drive: %u\n", machine().describe_context(), tag(), DRIVE);
logerror("%s WD2010 '%s' Sector Size: %u\n", machine().describe_context(), tag(), SECTOR_SIZE);
}
break;
case TASK_FILE_COMMAND:
if (data == COMMAND_COMPUTE_CORRECTION)
{
if (LOG) logerror("%s WD2010 '%s' COMPUTE CORRECTION\n", machine().describe_context(), tag());
compute_correction(data);
}
else if ((data & COMMAND_SET_PARAMETER_MASK) == COMMAND_SET_PARAMETER)
{
if (LOG) logerror("%s WD2010 '%s' SET PARAMETER\n", machine().describe_context(), tag());
set_parameter(data);
}
else
{
switch (data & COMMAND_MASK)
{
case COMMAND_RESTORE:
if (LOG) logerror("%s WD2010 '%s' RESTORE\n", machine().describe_context(), tag());
restore(data);
break;
case COMMAND_SEEK:
if (LOG) logerror("%s WD2010 '%s' SEEK\n", machine().describe_context(), tag());
seek(data);
break;
case COMMAND_READ_SECTOR:
if (LOG) logerror("%s WD2010 '%s' READ SECTOR\n", machine().describe_context(), tag());
read_sector(data);
break;
case COMMAND_WRITE_SECTOR:
if (LOG) logerror("%s WD2010 '%s' WRITE SECTOR\n", machine().describe_context(), tag());
write_sector(data);
break;
case COMMAND_SCAN_ID:
if (LOG) logerror("%s WD2010 '%s' SCAN ID\n", machine().describe_context(), tag());
scan_id(data);
break;
case COMMAND_WRITE_FORMAT:
if (LOG) logerror("%s WD2010 '%s' WRITE FORMAT\n", machine().describe_context(), tag());
format(data);
break;
}
}
break;
}
}
//-------------------------------------------------
// compute_correction -
//-------------------------------------------------
void wd2010_device::compute_correction(UINT8 data)
{
}
//-------------------------------------------------
// set_parameter -
//-------------------------------------------------
void wd2010_device::set_parameter(UINT8 data)
{
}
//-------------------------------------------------
// restore -
//-------------------------------------------------
void wd2010_device::restore(UINT8 data)
{
// reset INTRQ, errors, set BUSY, CIP
m_out_intrq_func(CLEAR_LINE);
m_error = 0;
m_status = STATUS_BSY | STATUS_CIP;
// reset RWC, set direction=OUT, store step rate
m_out_rwc_func(0);
m_out_dirin_func(0);
int step_pulses = 0;
while (step_pulses < 2048)
{
while (!m_in_sc_func())
{
// drive not ready or write fault?
if (!m_in_drdy_func() || m_in_wf_func())
{
// pulse BCR, set AC, INTRQ, reset BSY, CIP
m_out_bcr_func(0);
m_out_bcr_func(1);
m_error = ERROR_AC;
m_status = (m_in_drdy_func() << 6) | (m_in_wf_func() << 5) | STATUS_ERR;
m_out_intrq_func(ASSERT_LINE);
return;
}
}
if (m_in_tk000_func())
{
// pulse BCR, set INTRQ, reset BSY, CIP
m_out_bcr_func(0);
m_out_bcr_func(1);
m_status &= ~(STATUS_BSY | STATUS_CIP);
m_out_intrq_func(ASSERT_LINE);
return;
}
if (step_pulses == 2047)
{
// set TK000 error
m_error = ERROR_TK;
m_status |= STATUS_ERR;
// pulse BCR, set INTRQ, reset BSY, CIP
m_out_bcr_func(0);
m_out_bcr_func(1);
m_status &= ~(STATUS_BSY | STATUS_CIP);
m_out_intrq_func(ASSERT_LINE);
return;
}
// issue a step pulse
m_out_step_func(1);
m_out_step_func(0);
step_pulses++;
}
}
//-------------------------------------------------
// seek -
//-------------------------------------------------
void wd2010_device::seek(UINT8 data)
{
}
//-------------------------------------------------
// read_sector -
//-------------------------------------------------
void wd2010_device::read_sector(UINT8 data)
{
}
//-------------------------------------------------
// write_sector -
//-------------------------------------------------
void wd2010_device::write_sector(UINT8 data)
{
}
//-------------------------------------------------
// scan_id -
//-------------------------------------------------
void wd2010_device::scan_id(UINT8 data)
{
}
//-------------------------------------------------
// format -
//-------------------------------------------------
void wd2010_device::format(UINT8 data)
{
}
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