diff options
Diffstat (limited to 'arch/mips/pci/fixup-sni.c')
| -rw-r--r-- | arch/mips/pci/fixup-sni.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/arch/mips/pci/fixup-sni.c b/arch/mips/pci/fixup-sni.c new file mode 100644 index 000000000..de012f8bd --- /dev/null +++ b/arch/mips/pci/fixup-sni.c @@ -0,0 +1,169 @@ +/* + * 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; +} |