/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* SNI specific PCI support for RM200/RM300.
*
* Copyright (C) 1997 - 2000, 2003, 04 Ralf Baechle (ralf@linux-mips.org)
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <asm/mipsregs.h>
#include <asm/sni.h>
#include <irq.h>
/*
* PCIMT Shortcuts ...
*/
#define SCSI PCIMT_IRQ_SCSI
#define ETH PCIMT_IRQ_ETHERNET
#define INTA PCIMT_IRQ_INTA
#define INTB PCIMT_IRQ_INTB
#define INTC PCIMT_IRQ_INTC
#define INTD PCIMT_IRQ_INTD
/*
* Device 0: PCI EISA Bridge (directly routed)
* Device 1: NCR53c810 SCSI (directly routed)
* Device 2: PCnet32 Ethernet (directly routed)
* Device 3: VGA (routed to INTB)
* Device 4: Unused
* Device 5: Slot 2
* Device 6: Slot 3
* Device 7: Slot 4
*
* Documentation says the VGA is device 5 and device 3 is unused but that
* seem to be a documentation error. At least on my RM200C the Cirrus
* Logic CL-GD5434 VGA is device 3.
*/
static char irq_tab_rm200[8][5] = {
/* INTA INTB INTC INTD */
{ 0, 0, 0, 0, 0 }, /* EISA bridge */
{ SCSI, SCSI, SCSI, SCSI, SCSI }, /* SCSI */
{ ETH, ETH, ETH, ETH, ETH }, /* Ethernet */
{ INTB, INTB, INTB, INTB, INTB }, /* VGA */
{ 0, 0, 0, 0, 0 }, /* Unused */
{ 0, INTB, INTC, INTD, INTA }, /* Slot 2 */
{ 0, INTC, INTD, INTA, INTB }, /* Slot 3 */
{ 0, INTD, INTA, INTB, INTC }, /* Slot 4 */
};
/*
* In Revision D of the RM300 Device 2 has become a normal purpose Slot 1
*
* The VGA card is optional for RM300 systems.
*/
static char irq_tab_rm300d[8][5] = {
/* INTA INTB INTC INTD */
{ 0, 0, 0, 0, 0 }, /* EISA bridge */
{ SCSI, SCSI, SCSI, SCSI, SCSI }, /* SCSI */
{ 0, INTC, INTD, INTA, INTB }, /* Slot 1 */
{ INTB, INTB, INTB, INTB, INTB }, /* VGA */
{ 0, 0, 0, 0, 0 }, /* Unused */
{ 0, INTB, INTC, INTD, INTA }, /* Slot 2 */
{ 0, INTC, INTD, INTA, INTB }, /* Slot 3 */
{ 0, INTD, INTA, INTB, INTC }, /* Slot 4 */
};
static char irq_tab_rm300e[5][5] = {
/* INTA INTB INTC INTD */
{ 0, 0, 0, 0, 0 }, /* HOST bridge */
{ SCSI, SCSI, SCSI, SCSI, SCSI }, /* SCSI */
{ 0, INTC, INTD, INTA, INTB }, /* Bridge/i960 */
{ 0, INTD, INTA, INTB, INTC }, /* Slot 1 */
{ 0, INTA, INTB, INTC, INTD }, /* Slot 2 */
};
#undef SCSI
#undef ETH
#undef INTA
#undef INTB
#undef INTC
#undef INTD
/*
* PCIT Shortcuts ...
*/
#define SCSI0 PCIT_IRQ_SCSI0
#define SCSI1 PCIT_IRQ_SCSI1
#define ETH PCIT_IRQ_ETHERNET
#define INTA PCIT_IRQ_INTA
#define INTB PCIT_IRQ_INTB
#define INTC PCIT_IRQ_INTC
#define INTD PCIT_IRQ_INTD
static char irq_tab_pcit[13][5] = {
/* INTA INTB INTC INTD */
{ 0, 0, 0, 0, 0 }, /* HOST bridge */
{ SCSI0, SCSI0, SCSI0, SCSI0, SCSI0 }, /* SCSI */
{ SCSI1, SCSI1, SCSI1, SCSI1, SCSI1 }, /* SCSI */
{ ETH, ETH, ETH, ETH, ETH }, /* Ethernet */
{ 0, INTA, INTB, INTC, INTD }, /* PCI-PCI bridge */
{ 0, 0, 0, 0, 0 }, /* Unused */
{ 0, 0, 0, 0, 0 }, /* Unused */
{ 0, 0, 0, 0, 0 }, /* Unused */
{ 0, INTA, INTB, INTC, INTD }, /* Slot 1 */
{ 0, INTB, INTC, INTD, INTA }, /* Slot 2 */
{ 0, INTC, INTD, INTA, INTB }, /* Slot 3 */
{ 0, INTD, INTA, INTB, INTC }, /* Slot 4 */
{ 0, INTA, INTB, INTC, INTD }, /* Slot 5 */
};
static char irq_tab_pcit_cplus[13][5] = {
/* INTA INTB INTC INTD */
{ 0, 0, 0, 0, 0 }, /* HOST bridge */
{ 0, INTB, INTC, INTD, INTA }, /* PCI Slot 9 */
{ 0, 0, 0, 0, 0 }, /* PCI-EISA */
{ 0, 0, 0, 0, 0 }, /* Unused */
{ 0, INTA, INTB, INTC, INTD }, /* PCI-PCI bridge */
{ 0, INTB, INTC, INTD, INTA }, /* fixup */
};
static inline int is_rm300_revd(void)
{
unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
return (csmsr & 0xa0) == 0x20;
}
int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
switch (sni_brd_type) {
case SNI_BRD_PCI_TOWER_CPLUS:
if (slot == 4) {
/*
* SNI messed up interrupt wiring for onboard
* PCI bus 1; we need to fix this up here
*/
while (dev && dev->bus->number != 1)
dev = dev->bus->self;
if (dev && dev->devfn >= PCI_DEVFN(4, 0))
slot = 5;
}
return irq_tab_pcit_cplus[slot][pin];
case SNI_BRD_PCI_TOWER:
return irq_tab_pcit[slot][pin];
case SNI_BRD_PCI_MTOWER:
if (is_rm300_revd())
return irq_tab_rm300d[slot][pin];
fallthrough;
case SNI_BRD_PCI_DESKTOP:
return irq_tab_rm200[slot][pin];
case SNI_BRD_PCI_MTOWER_CPLUS:
return irq_tab_rm300e[slot][pin];
}
return 0;
}
/* Do platform specific device initialization at pci_enable_device() time */
int pcibios_plat_dev_init(struct pci_dev *dev)
{
return 0;
}
