/*
* This software is Copyright (C) 1998 by T.sqware - all rights limited
* It is provided in to the public domain "as is", can be freely modified
* as far as this copyight notice is kept unchanged, but does not imply
* an endorsement by T.sqware of the product in which it is included.
*/
#include <rtems.h>
#include <bsp.h>
#include <pcibios.h>
#include <string.h> /* memcpy */
/*
* This is simpliest possible PCI BIOS, it assumes that addressing
* is flat and that stack is big enough
*/
static int pcibInitialized = 0;
static unsigned int pcibEntry;
/*
* Array to pass data between c and __asm__ parts, at the time of
* writing I am not yet that familiar with extended __asm__ feature
* of gcc. This code is not on performance path, so we can care
* relatively little about performance here
*/
static volatile unsigned int pcibExchg[5];
static int pcib_convert_err(int err);
/*
* Detects presense of PCI BIOS, returns
* error code
*/
int
pci_initialize(void)
{
unsigned char *ucp;
unsigned char sum;
int i;
pcibInitialized = 0;
/* First, we have to look for BIOS-32 */
for (ucp = (unsigned char *)0xE0000;
ucp < (unsigned char *)0xFFFFF;
ucp += 0x10) {
if (memcmp(ucp, "_32_", 4) != 0) {
continue;
}
/* Got signature, check length */
if (*(ucp + 9) != 1) {
continue;
}
/* Verify checksum */
sum = 0;
for (i=0; i<16; i++) {
sum += *(ucp+i);
}
if (sum == 0) {
/* found */
break;
}
}
if (ucp >= (unsigned char *)0xFFFFF) {
/* BIOS-32 not found */
return PCIB_ERR_NOTPRESENT;
}
/* BIOS-32 found, let us find PCI BIOS */
ucp += 4;
pcibExchg[0] = *(unsigned int *)ucp;
__asm__ (" pusha"); /* Push all registers */
__asm__ (" movl pcibExchg, %edi"); /* Move entry point to esi */
__asm__ (" movl $0x49435024, %eax"); /* Move signature to eax */
__asm__ (" xorl %ebx, %ebx"); /* Zero ebx */
__asm__ (" pushl %cs");
__asm__ (" call *%edi"); /* Call entry */
__asm__ (" movl %eax, pcibExchg");
__asm__ (" movl %ebx, pcibExchg+4");
__asm__ (" movl %ecx, pcibExchg+8");
__asm__ (" movl %edx, pcibExchg+12");
__asm__ (" popa");
if ((pcibExchg[0] & 0xff) != 0) {
/* Not found */
return PCIB_ERR_NOTPRESENT;
}
/* Found PCI entry point */
pcibEntry = pcibExchg[1] + pcibExchg[3];
/* Let us check whether PCI bios is present */
pcibExchg[0] = pcibEntry;
__asm__ (" pusha");
__asm__ (" movl pcibExchg, %edi");
__asm__ (" movb $0xb1, %ah");
__asm__ (" movb $0x01, %al");
__asm__ (" pushl %cs");
__asm__ (" call *%edi");
__asm__ (" movl %eax, pcibExchg");
__asm__ (" movl %ebx, pcibExchg+4");
__asm__ (" movl %ecx, pcibExchg+8");
__asm__ (" movl %edx, pcibExchg+12");
__asm__ (" popa");
if ((pcibExchg[0] & 0xff00) != 0) {
/* Not found */
return PCIB_ERR_NOTPRESENT;
}
if (pcibExchg[3] != 0x20494350) {
/* Signature does not match */
return PCIB_ERR_NOTPRESENT;
}
/* Success */
pcibInitialized = 1;
return PCIB_ERR_SUCCESS;
}
/*
* Find specified device and return its signature: combination
* of bus number, device number and function number
*/
static int
pcib_find_by_devid(int vendorId, int devId, int idx, int *sig)
{
if (!pcibInitialized) {
return PCIB_ERR_UNINITIALIZED;
}
pcibExchg[0] = pcibEntry;
pcibExchg[1] = vendorId;
pcibExchg[2] = devId;
pcibExchg[3] = idx;
__asm__ (" pusha");
__asm__ (" movl pcibExchg, %edi");
__asm__ (" movb $0xb1, %ah");
__asm__ (" movb $0x02, %al");
__asm__ (" movl pcibExchg+4, %edx");
__asm__ (" movl pcibExchg+8, %ecx");
__asm__ (" movl pcibExchg+12, %esi");
__asm__ (" pushl %cs");
__asm__ (" call *%edi");
__asm__ (" movl %eax, pcibExchg");
__asm__ (" movl %ebx, pcibExchg+4");
__asm__ (" popa");
*sig = pcibExchg[1] & 0xffff;
return pcib_convert_err((pcibExchg[0] >> 8) & 0xff);
}
int
pci_find_device(
unsigned short vendorid,
unsigned short deviceid,
int instance,
int *pbus,
int *pdev,
int *pfun
)
{
int status;
int sig = 0;
status = pcib_find_by_devid( vendorid, deviceid, instance, &sig );
*pbus = PCIB_DEVSIG_BUS(sig);
*pdev = PCIB_DEVSIG_DEV(sig);
*pfun = PCIB_DEVSIG_FUNC(sig);
return status ? -1 : 0;
}
/*
* Find specified class code return device signature: combination
* of bus number, device number and function number
*/
int
pcib_find_by_class(int classCode, int idx, int *sig)
{
if (!pcibInitialized) {
return PCIB_ERR_UNINITIALIZED;
}
pcibExchg[0] = pcibEntry;
pcibExchg[1] = classCode;
pcibExchg[2] = idx;
__asm__ (" pusha");
__asm__ (" movl pcibExchg, %edi");
__asm__ (" movb $0xb1, %ah");
__asm__ (" movb $0x03, %al");
__asm__ (" movl pcibExchg+4, %ecx");
__asm__ (" movl pcibExchg+8, %esi");
__asm__ (" pushl %cs");
__asm__ (" call *%edi");
__asm__ (" movl %eax, pcibExchg");
__asm__ (" movl %ebx, pcibExchg+4");
__asm__ (" popa");
if ((pcibExchg[0] & 0xff00) != 0) {
return pcib_convert_err((pcibExchg[0] >> 8) & 0xff);
}
*sig = pcibExchg[1] & 0xffff;
return PCIB_ERR_SUCCESS;
}
static uint8_t ucBusCount = 0xff;
unsigned char
pci_bus_count(void)
{
if ( ucBusCount == 0xff ) {
unsigned char bus;
unsigned char dev;
unsigned char hd = 0;
uint32_t d = 0;
int sig;
ucBusCount = 0;
for (bus=0; bus< 0xff; bus++) {
for (dev=0; dev<PCI_MAX_DEVICES; dev++) {
sig = PCIB_DEVSIG_MAKE(bus,dev,0);
pcib_conf_read32(sig, PCI_VENDOR_ID, &d);
if ( d != -1 ) {
pcib_conf_read32(sig, PCI_CLASS_REVISION, &d);
if ( (d >> 16) == PCI_CLASS_BRIDGE_PCI ) {
pcib_conf_read8(sig, PCI_SUBORDINATE_BUS, &hd);
if ( hd > ucBusCount )
ucBusCount = hd;
}
}
}
}
if ( ucBusCount == 0 ) {
printk("pci_bus_count() found 0 busses, assuming 1\n");
ucBusCount = 1;
} else if ( ucBusCount == 0xff ) {
printk("pci_bus_count() found 0xff busses, assuming 1\n");
ucBusCount = 1;
}
}
return ucBusCount;
}
int
BSP_pciFindDevice( unsigned short vendorid, unsigned short deviceid,
int instance, int *pbus, int *pdev, int *pfun )
{
int sig, rval;
rval = pcib_find_by_devid(vendorid, deviceid, instance, &sig);
if ( PCIB_ERR_SUCCESS == rval ) {
*pbus = PCIB_DEVSIG_BUS(sig);
*pdev = PCIB_DEVSIG_DEV(sig);
*pfun = PCIB_DEVSIG_FUNC(sig);
}
return rval;
}
/*
* Generate Special Cycle
*/
int
pcib_special_cycle(int busNo, int data)
{
if (!pcibInitialized) {
return PCIB_ERR_UNINITIALIZED;
}
pcibExchg[0] = pcibEntry;
pcibExchg[1] = busNo << 8;
pcibExchg[2] = data;
__asm__ (" pusha");
__asm__ (" movl pcibExchg, %edi");
__asm__ (" movb $0xb1, %ah");
__asm__ (" movb $0x06, %al");
__asm__ (" movl pcibExchg+4, %ebx");
__asm__ (" movl pcibExchg+8, %edx");
__asm__ (" pushl %cs");
__asm__ (" call *%edi");
__asm__ (" movl %eax, pcibExchg");
__asm__ (" movl %ebx, pcibExchg+4");
__asm__ (" popa");
return pcib_convert_err((pcibExchg[0] >> 8) & 0xff);
}
/*
* Read byte from config space
*/
int
pcib_conf_read8(int sig, int off, uint8_t *data)
{
if (!pcibInitialized) {
return PCIB_ERR_UNINITIALIZED;
}
pcibExchg[0] = pcibEntry;
pcibExchg[1] = sig;
pcibExchg[2] = off;
__asm__ (" pusha");
__asm__ (" movl pcibExchg, %esi");
__asm__ (" movb $0xb1, %ah");
__asm__ (" movb $0x08, %al");
__asm__ (" movl pcibExchg+4, %ebx");
__asm__ (" movl pcibExchg+8, %edi");
__asm__ (" pushl %cs");
__asm__ (" call *%esi");
__asm__ (" movl %eax, pcibExchg");
__asm__ (" movl %ecx, pcibExchg+4");
__asm__ (" popa");
if ((pcibExchg[0] & 0xff00) != 0) {
return pcib_convert_err((pcibExchg[0] >> 8) & 0xff);
}
*data = (unsigned char)pcibExchg[1] & 0xff;
return PCIB_ERR_SUCCESS;
}
/*
* Read word from config space
*/
int
pcib_conf_read16(int sig, int off, uint16_t *data)
{
if (!pcibInitialized) {
return PCIB_ERR_UNINITIALIZED;
}
pcibExchg[0] = pcibEntry;
pcibExchg[1] = sig;
pcibExchg[2] = off;
__asm__ (" pusha");
__asm__ (" movl pcibExchg, %esi");
__asm__ (" movb $0xb1, %ah");
__asm__ (" movb $0x09, %al");
__asm__ (" movl pcibExchg+4, %ebx");
__asm__ (" movl pcibExchg+8, %edi");
__asm__ (" pushl %cs");
__asm__ (" call *%esi");
__asm__ (" movl %eax, pcibExchg");
__asm__ (" movl %ecx, pcibExchg+4");
__asm__ (" popa");
if ((pcibExchg[0] & 0xff00) != 0) {
return pcib_convert_err((pcibExchg[0] >> 8) & 0xff);
}
*data = (unsigned short)pcibExchg[1] & 0xffff;
return PCIB_ERR_SUCCESS;
}
/*
* Read dword from config space
*/
int
pcib_conf_read32(int sig, int off, uint32_t *data)
{
if (!pcibInitialized) {
return PCIB_ERR_UNINITIALIZED;
}
pcibExchg[0] = pcibEntry;
pcibExchg[1] = sig;
pcibExchg[2] = off;
__asm__ (" pusha");
__asm__ (" movl pcibExchg, %esi");
__asm__ (" movb $0xb1, %ah");
__asm__ (" movb $0x0a, %al");
__asm__ (" movl pcibExchg+4, %ebx");
__asm__ (" movl pcibExchg+8, %edi");
__asm__ (" pushl %cs");
__asm__ (" call *%esi");
__asm__ (" movl %eax, pcibExchg");
__asm__ (" movl %ecx, pcibExchg+4");
__asm__ (" popa");
if ((pcibExchg[0] & 0xff00) != 0) {
return pcib_convert_err((pcibExchg[0] >> 8) & 0xff);
}
*data = (unsigned int)pcibExchg[1];
return PCIB_ERR_SUCCESS;
}
/*
* Write byte into config space
*/
int
pcib_conf_write8(int sig, int off, uint8_t data)
{
if (!pcibInitialized) {
return PCIB_ERR_UNINITIALIZED;
}
pcibExchg[0] = pcibEntry;
pcibExchg[1] = sig;
pcibExchg[2] = off;
pcibExchg[3] = data & 0xff;
__asm__ (" pusha");
__asm__ (" movl pcibExchg, %esi");
__asm__ (" movb $0xb1, %ah");
__asm__ (" movb $0x0b, %al");
__asm__ (" movl pcibExchg+4, %ebx");
__asm__ (" movl pcibExchg+8, %edi");
__asm__ (" movl pcibExchg+12, %ecx");
__asm__ (" pushl %cs");
__asm__ (" call *%esi");
__asm__ (" movl %eax, pcibExchg");
__asm__ (" popa");
return pcib_convert_err((pcibExchg[0] >> 8) & 0xff);
}
/*
* Write word into config space
*/
int
pcib_conf_write16(int sig, int off, uint16_t data)
{
if (!pcibInitialized) {
return PCIB_ERR_UNINITIALIZED;
}
pcibExchg[0] = pcibEntry;
pcibExchg[1] = sig;
pcibExchg[2] = off;
pcibExchg[3] = data & 0xffff;
__asm__ (" pusha");
__asm__ (" movl pcibExchg, %esi");
__asm__ (" movb $0xb1, %ah");
__asm__ (" movb $0x0c, %al");
__asm__ (" movl pcibExchg+4, %ebx");
__asm__ (" movl pcibExchg+8, %edi");
__asm__ (" movl pcibExchg+12, %ecx");
__asm__ (" pushl %cs");
__asm__ (" call *%esi");
__asm__ (" movl %eax, pcibExchg");
__asm__ (" popa");
return pcib_convert_err((pcibExchg[0] >> 8) & 0xff);
}
/*
* Write dword into config space
*/
int
pcib_conf_write32(int sig, int off, uint32_t data)
{
if (!pcibInitialized){
return PCIB_ERR_UNINITIALIZED;
}
pcibExchg[0] = pcibEntry;
pcibExchg[1] = sig;
pcibExchg[2] = off;
pcibExchg[3] = data;
__asm__ (" pusha");
__asm__ (" movl pcibExchg, %esi");
__asm__ (" movb $0xb1, %ah");
__asm__ (" movb $0x0d, %al");
__asm__ (" movl pcibExchg+4, %ebx");
__asm__ (" movl pcibExchg+8, %edi");
__asm__ (" movl pcibExchg+12, %ecx");
__asm__ (" pushl %cs");
__asm__ (" call *%esi");
__asm__ (" movl %eax, pcibExchg");
__asm__ (" popa");
return pcib_convert_err((pcibExchg[0] >> 8) & 0xff);
}
static int
pcib_convert_err(int err)
{
switch(err & 0xff){
case 0:
return PCIB_ERR_SUCCESS;
case 0x81:
return PCIB_ERR_NOFUNC;
case 0x83:
return PCIB_ERR_BADVENDOR;
case 0x86:
return PCIB_ERR_DEVNOTFOUND;
case 0x87:
return PCIB_ERR_BADREG;
default:
break;
}
return PCIB_ERR_NOFUNC;
}
static int
BSP_pci_read_config_byte(
unsigned char bus,
unsigned char slot,
unsigned char fun,
unsigned char offset,
unsigned char *val
)
{
int sig;
sig = PCIB_DEVSIG_MAKE(bus,slot,fun);
pcib_conf_read8(sig, offset, val);
return PCIBIOS_SUCCESSFUL;
}
static int
BSP_pci_read_config_word(
unsigned char bus,
unsigned char slot,
unsigned char fun,
unsigned char offset,
unsigned short *val
)
{
int sig;
sig = PCIB_DEVSIG_MAKE(bus,slot,fun);
pcib_conf_read16(sig, offset, val);
return PCIBIOS_SUCCESSFUL;
}
static int
BSP_pci_read_config_dword(
unsigned char bus,
unsigned char slot,
unsigned char fun,
unsigned char offset,
uint32_t *val
)
{
int sig;
sig = PCIB_DEVSIG_MAKE(bus,slot,fun);
pcib_conf_read32(sig, offset, val);
return PCIBIOS_SUCCESSFUL;
}
static int
BSP_pci_write_config_byte(
unsigned char bus,
unsigned char slot,
unsigned char fun,
unsigned char offset,
unsigned char val
)
{
int sig;
sig = PCIB_DEVSIG_MAKE(bus,slot,fun);
pcib_conf_write8(sig, offset, val);
return PCIBIOS_SUCCESSFUL;
}
static int
BSP_pci_write_config_word(
unsigned char bus,
unsigned char slot,
unsigned char fun,
unsigned char offset,
unsigned short val
)
{
int sig;
sig = PCIB_DEVSIG_MAKE(bus,slot,fun);
pcib_conf_write16(sig, offset, val);
return PCIBIOS_SUCCESSFUL;
}
static int
BSP_pci_write_config_dword(
unsigned char bus,
unsigned char slot,
unsigned char fun,
unsigned char offset,
uint32_t val
)
{
int sig;
sig = PCIB_DEVSIG_MAKE(bus,slot,fun);
pcib_conf_write32(sig, offset, val);
return PCIBIOS_SUCCESSFUL;
}
const pci_config_access_functions pci_indirect_functions = {
BSP_pci_read_config_byte,
BSP_pci_read_config_word,
BSP_pci_read_config_dword,
BSP_pci_write_config_byte,
BSP_pci_write_config_word,
BSP_pci_write_config_dword
};
rtems_pci_config_t BSP_pci_configuration = {
(volatile unsigned char*)0,
(volatile unsigned char*)0,
&pci_indirect_functions
};