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/*
* pci.c : this file contains basic PCI Io functions.
*
* CopyRight (C) 1999 valette@crf.canon.fr
*
* This code is heavilly inspired by the public specification of STREAM V2
* that can be found at :
*
* <http://www.chorus.com/Documentation/index.html> by following
* the STREAM API Specification Document link.
*
* The license and distribution terms for this file may be
* found in found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*
* Till Straumann, <strauman@slac.stanford.edu>, 1/2002
* - separated bridge detection code out of this file
*/
#include <libcpu/io.h>
#include <bsp/pci.h>
/* allow for overriding these definitions */
#ifndef PCI_CONFIG_ADDR
#define PCI_CONFIG_ADDR 0xcf8
#endif
#ifndef PCI_CONFIG_DATA
#define PCI_CONFIG_DATA 0xcfc
#endif
#define PCI_INVALID_VENDORDEVICEID 0xffffffff
#define PCI_MULTI_FUNCTION 0x80
/* define a shortcut */
#define pci BSP_pci_configuration
/*
* Bit encode for PCI_CONFIG_HEADER_TYPE register
*/
unsigned char ucMaxPCIBus;
static int
indirect_pci_read_config_byte(unsigned char bus, unsigned char slot,
unsigned char function,
unsigned char offset, unsigned char *val) {
out_be32((unsigned int*) pci.pci_config_addr,
0x80|(bus<<8)|(PCI_DEVFN(slot,function)<<16)|((offset&~3)<<24));
*val = in_8(pci.pci_config_data + (offset&3));
return PCIBIOS_SUCCESSFUL;
}
static int
indirect_pci_read_config_word(unsigned char bus, unsigned char slot,
unsigned char function,
unsigned char offset, unsigned short *val) {
*val = 0xffff;
if (offset&1) return PCIBIOS_BAD_REGISTER_NUMBER;
out_be32((unsigned int*) pci.pci_config_addr,
0x80|(bus<<8)|(PCI_DEVFN(slot,function)<<16)|((offset&~3)<<24));
*val = in_le16((volatile unsigned short *)(pci.pci_config_data + (offset&3)));
return PCIBIOS_SUCCESSFUL;
}
static int
indirect_pci_read_config_dword(unsigned char bus, unsigned char slot,
unsigned char function,
unsigned char offset, unsigned int *val) {
*val = 0xffffffff;
if (offset&3) return PCIBIOS_BAD_REGISTER_NUMBER;
out_be32((unsigned int*) pci.pci_config_addr,
0x80|(bus<<8)|(PCI_DEVFN(slot,function)<<16)|(offset<<24));
*val = in_le32((volatile unsigned int *)pci.pci_config_data);
return PCIBIOS_SUCCESSFUL;
}
static int
indirect_pci_write_config_byte(unsigned char bus, unsigned char slot,
unsigned char function,
unsigned char offset, unsigned char val) {
out_be32((unsigned int*) pci.pci_config_addr,
0x80|(bus<<8)|(PCI_DEVFN(slot,function)<<16)|((offset&~3)<<24));
out_8(pci.pci_config_data + (offset&3), val);
return PCIBIOS_SUCCESSFUL;
}
static int
indirect_pci_write_config_word(unsigned char bus, unsigned char slot,
unsigned char function,
unsigned char offset, unsigned short val) {
if (offset&1) return PCIBIOS_BAD_REGISTER_NUMBER;
out_be32((unsigned int*) pci.pci_config_addr,
0x80|(bus<<8)|(PCI_DEVFN(slot,function)<<16)|((offset&~3)<<24));
out_le16((volatile unsigned short *)(pci.pci_config_data + (offset&3)), val);
return PCIBIOS_SUCCESSFUL;
}
static int
indirect_pci_write_config_dword(unsigned char bus, unsigned char slot,
unsigned char function,
unsigned char offset, unsigned int val) {
if (offset&3) return PCIBIOS_BAD_REGISTER_NUMBER;
out_be32((unsigned int*) pci.pci_config_addr,
0x80|(bus<<8)|(PCI_DEVFN(slot,function)<<16)|(offset<<24));
out_le32((volatile unsigned int *)pci.pci_config_data, val);
return PCIBIOS_SUCCESSFUL;
}
const pci_config_access_functions pci_indirect_functions = {
indirect_pci_read_config_byte,
indirect_pci_read_config_word,
indirect_pci_read_config_dword,
indirect_pci_write_config_byte,
indirect_pci_write_config_word,
indirect_pci_write_config_dword
};
pci_config BSP_pci_configuration = {(volatile unsigned char*)PCI_CONFIG_ADDR,
(volatile unsigned char*)PCI_CONFIG_DATA,
&pci_indirect_functions};
static int
direct_pci_read_config_byte(unsigned char bus, unsigned char slot,
unsigned char function,
unsigned char offset, unsigned char *val) {
if (bus != 0 || (1<<slot & 0xff8007fe)) {
*val=0xff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
*val=in_8(pci.pci_config_data + ((1<<slot)&~1)
+ (function<<8) + offset);
return PCIBIOS_SUCCESSFUL;
}
static int
direct_pci_read_config_word(unsigned char bus, unsigned char slot,
unsigned char function,
unsigned char offset, unsigned short *val) {
*val = 0xffff;
if (offset&1) return PCIBIOS_BAD_REGISTER_NUMBER;
if (bus != 0 || (1<<slot & 0xff8007fe)) {
return PCIBIOS_DEVICE_NOT_FOUND;
}
*val=in_le16((volatile unsigned short *)
(pci.pci_config_data + ((1<<slot)&~1)
+ (function<<8) + offset));
return PCIBIOS_SUCCESSFUL;
}
static int
direct_pci_read_config_dword(unsigned char bus, unsigned char slot,
unsigned char function,
unsigned char offset, unsigned int *val) {
*val = 0xffffffff;
if (offset&3) return PCIBIOS_BAD_REGISTER_NUMBER;
if (bus != 0 || (1<<slot & 0xff8007fe)) {
return PCIBIOS_DEVICE_NOT_FOUND;
}
*val=in_le32((volatile unsigned int *)
(pci.pci_config_data + ((1<<slot)&~1)
+ (function<<8) + offset));
return PCIBIOS_SUCCESSFUL;
}
static int
direct_pci_write_config_byte(unsigned char bus, unsigned char slot,
unsigned char function,
unsigned char offset, unsigned char val) {
if (bus != 0 || (1<<slot & 0xff8007fe)) {
return PCIBIOS_DEVICE_NOT_FOUND;
}
out_8(pci.pci_config_data + ((1<<slot)&~1)
+ (function<<8) + offset,
val);
return PCIBIOS_SUCCESSFUL;
}
static int
direct_pci_write_config_word(unsigned char bus, unsigned char slot,
unsigned char function,
unsigned char offset, unsigned short val) {
if (offset&1) return PCIBIOS_BAD_REGISTER_NUMBER;
if (bus != 0 || (1<<slot & 0xff8007fe)) {
return PCIBIOS_DEVICE_NOT_FOUND;
}
out_le16((volatile unsigned short *)
(pci.pci_config_data + ((1<<slot)&~1)
+ (function<<8) + offset),
val);
return PCIBIOS_SUCCESSFUL;
}
static int
direct_pci_write_config_dword(unsigned char bus, unsigned char slot,
unsigned char function,
unsigned char offset, unsigned int val) {
if (offset&3) return PCIBIOS_BAD_REGISTER_NUMBER;
if (bus != 0 || (1<<slot & 0xff8007fe)) {
return PCIBIOS_DEVICE_NOT_FOUND;
}
out_le32((volatile unsigned int *)
(pci.pci_config_data + ((1<<slot)&~1)
+ (function<<8) + offset),
val);
return PCIBIOS_SUCCESSFUL;
}
const pci_config_access_functions pci_direct_functions = {
direct_pci_read_config_byte,
direct_pci_read_config_word,
direct_pci_read_config_dword,
direct_pci_write_config_byte,
direct_pci_write_config_word,
direct_pci_write_config_dword
};
/*
* This routine determines the maximum bus number in the system
*/
void InitializePCI()
{
extern void detect_host_bridge();
unsigned char ucSlotNumber, ucFnNumber, ucNumFuncs;
unsigned char ucHeader;
unsigned char ucMaxSubordinate;
unsigned int ulClass, ulDeviceID;
detect_host_bridge();
/*
* Scan PCI bus 0 looking for PCI-PCI bridges
*/
for(ucSlotNumber=0;ucSlotNumber<PCI_MAX_DEVICES;ucSlotNumber++) {
(void)pci_read_config_dword(0,
ucSlotNumber,
0,
PCI_VENDOR_ID,
&ulDeviceID);
if(ulDeviceID==PCI_INVALID_VENDORDEVICEID) {
/*
* This slot is empty
*/
continue;
}
(void)pci_read_config_byte(0,
ucSlotNumber,
0,
PCI_HEADER_TYPE,
&ucHeader);
if(ucHeader&PCI_MULTI_FUNCTION) {
ucNumFuncs=PCI_MAX_FUNCTIONS;
}
else {
ucNumFuncs=1;
}
for(ucFnNumber=0;ucFnNumber<ucNumFuncs;ucFnNumber++) {
(void)pci_read_config_dword(0,
ucSlotNumber,
ucFnNumber,
PCI_VENDOR_ID,
&ulDeviceID);
if(ulDeviceID==PCI_INVALID_VENDORDEVICEID) {
/*
* This slot/function is empty
*/
continue;
}
/*
* This slot/function has a device fitted.
*/
(void)pci_read_config_dword(0,
ucSlotNumber,
ucFnNumber,
PCI_CLASS_REVISION,
&ulClass);
ulClass >>= 16;
if (ulClass == PCI_CLASS_BRIDGE_PCI) {
/*
* We have found a PCI-PCI bridge
*/
(void)pci_read_config_byte(0,
ucSlotNumber,
ucFnNumber,
PCI_SUBORDINATE_BUS,
&ucMaxSubordinate);
if(ucMaxSubordinate>ucMaxPCIBus) {
ucMaxPCIBus=ucMaxSubordinate;
}
}
}
}
}
/*
* Return the number of PCI busses in the system
*/
unsigned char BusCountPCI()
{
return(ucMaxPCIBus+1);
}
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