LXR linux/arch/mips/pci/fixup-sni.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * SNI specific PCI support for RM200/RM300.
   7 *
   8 * Copyright (C) 1997 - 2000, 2003, 04 Ralf Baechle (ralf@linux-mips.org)
   9 */
  10#include <linux/kernel.h>
  11#include <linux/init.h>
  12#include <linux/pci.h>
  13
  14#include <asm/mipsregs.h>
  15#include <asm/sni.h>
  16
  17#include <irq.h>
  18
  19/*
  20 * PCIMT Shortcuts ...
  21 */
  22#define SCSI    PCIMT_IRQ_SCSI
  23#define ETH     PCIMT_IRQ_ETHERNET
  24#define INTA    PCIMT_IRQ_INTA
  25#define INTB    PCIMT_IRQ_INTB
  26#define INTC    PCIMT_IRQ_INTC
  27#define INTD    PCIMT_IRQ_INTD
  28
  29/*
  30 * Device 0: PCI EISA Bridge    (directly routed)
  31 * Device 1: NCR53c810 SCSI     (directly routed)
  32 * Device 2: PCnet32 Ethernet   (directly routed)
  33 * Device 3: VGA                (routed to INTB)
  34 * Device 4: Unused
  35 * Device 5: Slot 2
  36 * Device 6: Slot 3
  37 * Device 7: Slot 4
  38 *
  39 * Documentation says the VGA is device 5 and device 3 is unused but that
  40 * seem to be a documentation error.  At least on my RM200C the Cirrus
  41 * Logic CL-GD5434 VGA is device 3.
  42 */
  43static char irq_tab_rm200[8][5] = {
  44        /*       INTA  INTB  INTC  INTD */
  45        {     0,    0,    0,    0,    0 },      /* EISA bridge */
  46        {  SCSI, SCSI, SCSI, SCSI, SCSI },      /* SCSI */
  47        {   ETH,  ETH,  ETH,  ETH,  ETH },      /* Ethernet */
  48        {  INTB, INTB, INTB, INTB, INTB },      /* VGA */
  49        {     0,    0,    0,    0,    0 },      /* Unused */
  50        {     0, INTB, INTC, INTD, INTA },      /* Slot 2 */
  51        {     0, INTC, INTD, INTA, INTB },      /* Slot 3 */
  52        {     0, INTD, INTA, INTB, INTC },      /* Slot 4 */
  53};
  54
  55/*
  56 * In Revision D of the RM300 Device 2 has become a normal purpose Slot 1
  57 *
  58 * The VGA card is optional for RM300 systems.
  59 */
  60static char irq_tab_rm300d[8][5] = {
  61        /*       INTA  INTB  INTC  INTD */
  62        {     0,    0,    0,    0,    0 },      /* EISA bridge */
  63        {  SCSI, SCSI, SCSI, SCSI, SCSI },      /* SCSI */
  64        {     0, INTC, INTD, INTA, INTB },      /* Slot 1 */
  65        {  INTB, INTB, INTB, INTB, INTB },      /* VGA */
  66        {     0,    0,    0,    0,    0 },      /* Unused */
  67        {     0, INTB, INTC, INTD, INTA },      /* Slot 2 */
  68        {     0, INTC, INTD, INTA, INTB },      /* Slot 3 */
  69        {     0, INTD, INTA, INTB, INTC },      /* Slot 4 */
  70};
  71
  72static char irq_tab_rm300e[5][5] = {
  73        /*       INTA  INTB  INTC  INTD */
  74        {     0,    0,    0,    0,    0 },      /* HOST bridge */
  75        {  SCSI, SCSI, SCSI, SCSI, SCSI },      /* SCSI */
  76        {     0, INTC, INTD, INTA, INTB },      /* Bridge/i960 */
  77        {     0, INTD, INTA, INTB, INTC },      /* Slot 1 */
  78        {     0, INTA, INTB, INTC, INTD },      /* Slot 2 */
  79};
  80#undef SCSI
  81#undef ETH
  82#undef INTA
  83#undef INTB
  84#undef INTC
  85#undef INTD
  86
  87
  88/*
  89 * PCIT Shortcuts ...
  90 */
  91#define SCSI0   PCIT_IRQ_SCSI0
  92#define SCSI1   PCIT_IRQ_SCSI1
  93#define ETH     PCIT_IRQ_ETHERNET
  94#define INTA    PCIT_IRQ_INTA
  95#define INTB    PCIT_IRQ_INTB
  96#define INTC    PCIT_IRQ_INTC
  97#define INTD    PCIT_IRQ_INTD
  98
  99static char irq_tab_pcit[13][5] = {
 100        /*       INTA  INTB  INTC  INTD */
 101        {     0,     0,     0,     0,     0 },  /* HOST bridge */
 102        { SCSI0, SCSI0, SCSI0, SCSI0, SCSI0 },  /* SCSI */
 103        { SCSI1, SCSI1, SCSI1, SCSI1, SCSI1 },  /* SCSI */
 104        {   ETH,   ETH,   ETH,   ETH,   ETH },  /* Ethernet */
 105        {     0,  INTA,  INTB,  INTC,  INTD },  /* PCI-PCI bridge */
 106        {     0,     0,     0,     0,     0 },  /* Unused */
 107        {     0,     0,     0,     0,     0 },  /* Unused */
 108        {     0,     0,     0,     0,     0 },  /* Unused */
 109        {     0,  INTA,  INTB,  INTC,  INTD },  /* Slot 1 */
 110        {     0,  INTB,  INTC,  INTD,  INTA },  /* Slot 2 */
 111        {     0,  INTC,  INTD,  INTA,  INTB },  /* Slot 3 */
 112        {     0,  INTD,  INTA,  INTB,  INTC },  /* Slot 4 */
 113        {     0,  INTA,  INTB,  INTC,  INTD },  /* Slot 5 */
 114};
 115
 116static char irq_tab_pcit_cplus[13][5] = {
 117        /*       INTA  INTB  INTC  INTD */
 118        {     0,     0,     0,     0,     0 },  /* HOST bridge */
 119        {     0,  INTB,  INTC,  INTD,  INTA },  /* PCI Slot 9 */
 120        {     0,     0,     0,     0,     0 },  /* PCI-EISA */
 121        {     0,     0,     0,     0,     0 },  /* Unused */
 122        {     0,  INTA,  INTB,  INTC,  INTD },  /* PCI-PCI bridge */
 123        {     0,  INTB,  INTC,  INTD,  INTA },  /* fixup */
 124};
 125
 126static inline int is_rm300_revd(void)
 127{
 128        unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
 129
 130        return (csmsr & 0xa0) == 0x20;
 131}
 132
 133int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 134{
 135        switch (sni_brd_type) {
 136        case SNI_BRD_PCI_TOWER_CPLUS:
 137                if (slot == 4) {
 138                        /*
 139                         * SNI messed up interrupt wiring for onboard
 140                         * PCI bus 1; we need to fix this up here
 141                         */
 142                        while (dev && dev->bus->number != 1)
 143                                dev = dev->bus->self;
 144                        if (dev && dev->devfn >= PCI_DEVFN(4, 0))
 145                                slot = 5;
 146                }
 147                return irq_tab_pcit_cplus[slot][pin];
 148        case SNI_BRD_PCI_TOWER:
 149                return irq_tab_pcit[slot][pin];
 150
 151        case SNI_BRD_PCI_MTOWER:
 152                if (is_rm300_revd())
 153                        return irq_tab_rm300d[slot][pin];
 154                /* fall through */
 155
 156        case SNI_BRD_PCI_DESKTOP:
 157                return irq_tab_rm200[slot][pin];
 158
 159        case SNI_BRD_PCI_MTOWER_CPLUS:
 160                return irq_tab_rm300e[slot][pin];
 161        }
 162
 163        return 0;
 164}
 165
 166/* Do platform specific device initialization at pci_enable_device() time */
 167int pcibios_plat_dev_init(struct pci_dev *dev)
 168{
 169        return 0;
 170}
 171