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  */
  43 static 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  */
  60 static 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
  72 static 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
  99 static 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
 116 static 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
 126 static inline int is_rm300_revd(void)
 127 {
 128         unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
 129
 130         return (csmsr & 0xa0) == 0x20;
 131 }
 132
 133 int 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                 fallthrough;
 155         case SNI_BRD_PCI_DESKTOP:
 156                 return irq_tab_rm200[slot][pin];
 157
 158         case SNI_BRD_PCI_MTOWER_CPLUS:
 159                 return irq_tab_rm300e[slot][pin];
 160         }
 161
 162         return 0;
 163 }
 164
 165 /* Do platform specific device initialization at pci_enable_device() time */
 166 int pcibios_plat_dev_init(struct pci_dev *dev)
 167 {
 168         return 0;
 169 }