/* $NetBSD: pci.c,v 1.6 2022/02/16 23:49:26 riastradh Exp $ */
/*
* Copyright (C) 1995-1997 Gary Thomas (
[email protected])
* All rights reserved.
*
* Adapted from a program by:
* Steve Sellgren
* San Francisco Indigo Company
*
[email protected]
* Adapted for Moto boxes by:
* Pat Kane & Mark Scott, 1996
* Fixed for IBM/PowerStack II Pat Kane 1997
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Gary Thomas.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <lib/libsa/stand.h>
#include <sys/bswap.h>
#include <dev/pci/pcireg.h>
#include "boot.h"
#define NSLOTS 5
#define NPCIREGS 10
/*
* should use devfunc number/indirect method to be totally safe on
* all machines, this works for now on 3 slot Moto boxes
*/
#define PCI_CONFIG_SPACE_BASE 0x80800000
#define PCI_CONFIG_SPACE(d, f) \
(u_long *)(PCI_CONFIG_SPACE_BASE | (1 << (d)) | ((f) << 8))
struct PCI_ConfigInfo {
u_long *config_addr;
u_long regs[NPCIREGS];
} PCI_slots [NSLOTS] = {
{ PCI_CONFIG_SPACE(11, 0), { 0xDE, 0xAD, 0xBE, 0xEF } },
{ PCI_CONFIG_SPACE(12, 0), { 0xDE, 0xAD, 0xBE, 0xEF } },
{ PCI_CONFIG_SPACE(13, 0), { 0xDE, 0xAD, 0xBE, 0xEF } },
{ PCI_CONFIG_SPACE(14, 0), { 0xDE, 0xAD, 0xBE, 0xEF } },
{ PCI_CONFIG_SPACE(15, 0), { 0xDE, 0xAD, 0xBE, 0xEF } },
};
#define DEVID (PCI_ID_REG >> 2)
#define CMD (PCI_COMMAND_STATUS_REG >> 2)
#define CLASS (PCI_CLASS_REG >> 2)
#define BAR_BASE (PCI_MAPREG_START >> 2)
/*
* The following code modifies the PCI Command register
* to enable memory and I/O accesses.
*/
void
enablePCI(int slot, int io, int mem, int master)
{
volatile u_char *ppci;
u_char enable = 0;
if (io)
enable |= PCI_COMMAND_IO_ENABLE;
if (mem)
enable |= PCI_COMMAND_MEM_ENABLE;
if (master)
enable |= PCI_COMMAND_MASTER_ENABLE;
ppci = (u_char *)&PCI_slots[slot].config_addr[CMD];
*ppci = enable;
__asm volatile("eieio" ::: "memory");
}
void
scanPCI(void)
{
struct PCI_ConfigInfo *pslot;
int slt, r;
for (slt = 0; slt < NSLOTS; slt++) {
pslot = &PCI_slots[slt];
for (r = 0; r < NPCIREGS; r++)
pslot->regs[r] = bswap32(pslot->config_addr[r]);
}
}
int
findPCIVga(void)
{
struct PCI_ConfigInfo *pslot;
int theSlot = -1;
int highVgaSlot = -1;
int slt;
for (slt = 0; slt < NSLOTS; slt++) {
pslot = &PCI_slots[slt];
if (pslot->regs[DEVID] != 0xffffffff) { /* card in slot ? */
if (PCI_CLASS(pslot->regs[CLASS]) ==
PCI_CLASS_DISPLAY) {
highVgaSlot = slt;
if ((pslot->regs[CMD] & 0x03)) { /* did firmware enable it ? */
theSlot = slt;
}
}
}
}
if (theSlot == -1)
theSlot = highVgaSlot;
return theSlot;
}
int
PCISlotnum(u_int bus, u_int dev, u_int func)
{
u_long *tag;
int i;
if (bus != 0 ||
dev < 11 || dev > 15 ||
func > 7)
return -1;
tag = PCI_CONFIG_SPACE(dev, func);
for (i = 0; i < sizeof(PCI_slots) / sizeof(struct PCI_ConfigInfo); i++)
if (tag == PCI_slots[i].config_addr)
return i;
return -1;
}
/* return Vendor ID of card in the slot */
int
PCIVendor(int slotnum)
{
struct PCI_ConfigInfo *pslot;
pslot = &PCI_slots[slotnum];
return pslot->regs[DEVID] & 0xffff;
}
/* return mapped address for I/O or Memory */
u_long
PCIAddress(int slotnum, u_int bar, int type)
{
struct PCI_ConfigInfo *pslot;
if (bar >= 6)
return 0xffffffff;
pslot = &PCI_slots[slotnum];
if (pslot->regs[DEVID] == 0xffffffff ||
PCI_MAPREG_TYPE(pslot->regs[BAR_BASE + bar]) != type)
return 0xffffffff;
return PCI_MAPREG_MEM_ADDR(pslot->regs[BAR_BASE + bar]);
}
#ifdef DEBUG
void
printPCIslots(void)
{
int i;
for (i = 0; i < NSLOTS; i++) {
printf("PCI Slot number: %d", i);
printf(" Vendor ID: 0x%x\n", PCIVendor(i));
}
}
#endif /* DEBUG */
