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// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/***************************************************************************
pci.c
PCI bus
The PCI bus is a 32-bit bus introduced by Intel, so it is little endian
Control word:
bit 31: Enable bit
bits 30-24: Reserved
bits 23-16: PCI bus number
bits 15-11: PCI device number
bits 10- 8: PCI function number
bits 7- 0: Offset address
Standard PCI registers:
0x00 2 Vendor ID
0x02 2 Device ID
0x04 2 PCI Command
0x06 2 PCI Status
0x08 1 Revision ID
0x09 1 Programming Interface
0x0A 1 Subclass Code
0x0B 1 Class Code
Class Code/Subclass Code/Programming Interface
0x00XXXX Pre-PCI 2.0 devices
0x000000 Non-VGA device
0x000101 VGA device
0x01XXXX Storage Controller
0x010000 SCSI
0x0101XX IDE
0x0102XX Floppy
0x0103XX IPI
0x0104XX RAID
0x0180XX Other
0x02XXXX Network Card
0x020000 Ethernet
0x020100 Tokenring
0x020200 FDDI
0x020300 ATM
0x028000 Other
0x03XXXX Display Controller
0x030000 VGA
0x030001 8514 Compatible
0x030100 XGA
0x038000 Other
0x04XXXX Multimedia
0x040000 Video
0x040100 Audio
0x048000 Other
0x05XXXX Memory Controller
0x050000 RAM
0x050100 Flash
0x058000 Other
0x06XXXX Bridge
0x060000 Host/PCI
0x060100 PCI/ISA
0x060200 PCI/EISA
0x060300 PCI/Micro Channel
0x060400 PCI/PCI
0x060500 PCI/PCMCIA
0x060600 PCI/NuBus
0x060700 PCI/CardBus
0x068000 Other
Information on PCI vendors can be found at http://www.pcidatabase.com/
***************************************************************************/
#include "emu.h"
#include "pci.h"
#define LOG_PCI 0
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
const device_type PCI_BUS = &device_creator<pci_bus_device>;
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// pci_bus_device - constructor
//-------------------------------------------------
pci_bus_device::pci_bus_device(const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock) :
device_t(mconfig, PCI_BUS, "PCI Bus", tag, owner, clock, "pci_bus", __FILE__), m_busnum(0),
m_father(nullptr), m_address(0), m_devicenum(0), m_busnumber(0), m_busnumaddr(nullptr)
{
m_siblings_count = 0;
}
/***************************************************************************
INLINE FUNCTIONS
***************************************************************************/
READ32_MEMBER( pci_bus_device::read )
{
UINT32 result = 0xffffffff;
int function, reg;
offset %= 2;
switch (offset)
{
case 0:
result = m_address;
break;
case 1:
if (m_devicenum != -1)
{
if (m_busnumaddr->m_device[m_devicenum] != nullptr)
{
function = (m_address >> 8) & 0x07;
reg = (m_address >> 0) & 0xfc;
result = m_busnumaddr->m_device[m_devicenum]->pci_read(m_busnumaddr, function, reg, mem_mask);
}
}
break;
}
if (LOG_PCI)
logerror("read('%s'): offset=%d result=0x%08X\n", tag().c_str(), offset, result);
return result;
}
pci_bus_device *pci_bus_device::pci_search_bustree(int busnum, int devicenum, pci_bus_device *pcibus)
{
int a;
pci_bus_device *ret;
if (pcibus->m_busnum == busnum)
{
return pcibus;
}
for (a = 0; a < pcibus->m_siblings_count; a++)
{
ret = pci_search_bustree(busnum, devicenum, pcibus->m_siblings[a]);
if (ret != nullptr)
return ret;
}
return nullptr;
}
WRITE32_MEMBER( pci_bus_device::write )
{
offset %= 2;
if (LOG_PCI)
logerror("write('%s'): offset=%d data=0x%08X\n", tag().c_str(), offset, data);
switch (offset)
{
case 0:
m_address = data;
/* lookup current device */
if (m_address & 0x80000000)
{
int busnum = (m_address >> 16) & 0xff;
int devicenum = (m_address >> 11) & 0x1f;
m_busnumaddr = pci_search_bustree(busnum, devicenum, this);
if (m_busnumaddr != nullptr)
{
m_busnumber = busnum;
m_devicenum = devicenum;
}
else
m_devicenum = -1;
if (LOG_PCI)
logerror(" bus:%d device:%d\n", busnum, devicenum);
}
break;
case 1:
if (m_devicenum != -1)
{
if (m_busnumaddr->m_device[m_devicenum] != nullptr)
{
int function = (m_address >> 8) & 0x07;
int reg = (m_address >> 0) & 0xfc;
m_busnumaddr->m_device[m_devicenum]->pci_write(m_busnumaddr, function, reg, data, mem_mask);
}
if (LOG_PCI)
logerror(" function:%d register:%d\n", (m_address >> 8) & 0x07, (m_address >> 0) & 0xfc);
}
break;
}
}
READ64_MEMBER(pci_bus_device::read_64be)
{
UINT64 result = 0;
mem_mask = FLIPENDIAN_INT64(mem_mask);
if (ACCESSING_BITS_0_31)
result |= (UINT64)read(space, offset * 2 + 0, mem_mask >> 0) << 0;
if (ACCESSING_BITS_32_63)
result |= (UINT64)read(space, offset * 2 + 1, mem_mask >> 32) << 32;
return FLIPENDIAN_INT64(result);
}
WRITE64_MEMBER(pci_bus_device::write_64be)
{
data = FLIPENDIAN_INT64(data);
mem_mask = FLIPENDIAN_INT64(mem_mask);
if (ACCESSING_BITS_0_31)
write(space, offset * 2 + 0, data >> 0, mem_mask >> 0);
if (ACCESSING_BITS_32_63)
write(space, offset * 2 + 1, data >> 32, mem_mask >> 32);
}
void pci_bus_device::add_sibling(pci_bus_device *sibling, int busnum)
{
m_siblings[m_siblings_count] = sibling;
m_siblings_busnum[m_siblings_count] = busnum;
m_siblings_count++;
}
//-------------------------------------------------
// device_post_load - handle updating after a
// restore
//-------------------------------------------------
void pci_bus_device::device_post_load()
{
if (m_devicenum != -1)
{
m_busnumaddr = pci_search_bustree(m_busnumber, m_devicenum, this);
}
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void pci_bus_device::device_start()
{
/* store a pointer back to the device */
m_devicenum = -1;
char id[3];
/* find all our devices */
for (int i = 0; i < ARRAY_LENGTH(m_devtag); i++)
{
sprintf(id, "%d", i);
pci_connector *conn = downcast<pci_connector *>(subdevice(id));
if (conn!=nullptr)
m_device[i] = conn->get_device();
else
m_device[i] = nullptr;
}
if (m_father != nullptr) {
pci_bus_device *father = machine().device<pci_bus_device>(m_father);
if (father)
father->add_sibling(this, m_busnum);
}
/* register pci states */
save_item(NAME(m_address));
save_item(NAME(m_devicenum));
save_item(NAME(m_busnum));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void pci_bus_device::device_reset()
{
/* reset the drive state */
m_devicenum = -1;
m_address = 0;
}
//-------------------------------------------------
// pci_device_interface - constructor
//-------------------------------------------------
pci_device_interface::pci_device_interface(const machine_config &mconfig, device_t &device)
: device_slot_card_interface(mconfig, device)
{
}
//-------------------------------------------------
// ~pci_device_interface - destructor
//-------------------------------------------------
pci_device_interface::~pci_device_interface()
{
}
const device_type PCI_CONNECTOR = &device_creator<pci_connector>;
pci_connector::pci_connector(const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock) :
device_t(mconfig, PCI_CONNECTOR, "PCI device connector abstraction", tag, owner, clock, "pci_connector", __FILE__),
device_slot_interface(mconfig, *this)
{
}
pci_connector::~pci_connector()
{
}
void pci_connector::device_start()
{
}
pci_device_interface *pci_connector::get_device()
{
return dynamic_cast<pci_device_interface *>(get_card_device());
}
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