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