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 Ralf Baechle
   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/pci_channel.h>
  16 #include <asm/sni.h>
  17
  18 /*
  19  * Shortcuts ...
  20  */
  21 #define SCSI    PCIMT_IRQ_SCSI
  22 #define ETH     PCIMT_IRQ_ETHERNET
  23 #define INTA    PCIMT_IRQ_INTA
  24 #define INTB    PCIMT_IRQ_INTB
  25 #define INTC    PCIMT_IRQ_INTC
  26 #define INTD    PCIMT_IRQ_INTD
  27
  28 /*
  29  * Device 0: PCI EISA Bridge    (directly routed)
  30  * Device 1: NCR53c810 SCSI     (directly routed)
  31  * Device 2: PCnet32 Ethernet   (directly routed)
  32  * Device 3: VGA                (routed to INTB)
  33  * Device 4: Unused
  34  * Device 5: Slot 2
  35  * Device 6: Slot 3
  36  * Device 7: Slot 4
  37  *
  38  * Documentation says the VGA is device 5 and device 3 is unused but that
  39  * seem to be a documentation error.  At least on my RM200C the Cirrus
  40  * Logic CL-GD5434 VGA is device 3.
  41  */
  42 static char irq_tab_rm200[8][5] __initdata = {
  43         /*       INTA  INTB  INTC  INTD */
  44         {     0,    0,    0,    0,    0 },      /* EISA bridge */
  45         {  SCSI, SCSI, SCSI, SCSI, SCSI },      /* SCSI */
  46         {   ETH,  ETH,  ETH,  ETH,  ETH },      /* Ethernet */
  47         {  INTB, INTB, INTB, INTB, INTB },      /* VGA */
  48         {     0,    0,    0,    0,    0 },      /* Unused */
  49         {     0, INTB, INTC, INTD, INTA },      /* Slot 2 */
  50         {     0, INTC, INTD, INTA, INTB },      /* Slot 3 */
  51         {     0, INTD, INTA, INTB, INTC },      /* Slot 4 */
  52 };
  53
  54 /*
  55  * In Revision D of the RM300 Device 2 has become a normal purpose Slot 1
  56  *
  57  * The VGA card is optional for RM300 systems.
  58  */
  59 static char irq_tab_rm300d[8][5] __initdata = {
  60         /*       INTA  INTB  INTC  INTD */
  61         {     0,    0,    0,    0,    0 },      /* EISA bridge */
  62         {  SCSI, SCSI, SCSI, SCSI, SCSI },      /* SCSI */
  63         {     0, INTC, INTD, INTA, INTB },      /* Slot 1 */
  64         {  INTB, INTB, INTB, INTB, INTB },      /* VGA */
  65         {     0,    0,    0,    0,    0 },      /* Unused */
  66         {     0, INTB, INTC, INTD, INTA },      /* Slot 2 */
  67         {     0, INTC, INTD, INTA, INTB },      /* Slot 3 */
  68         {     0, INTD, INTA, INTB, INTC },      /* Slot 4 */
  69 };
  70
  71 static inline int is_rm300_revd(void)
  72 {
  73         unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
  74
  75         return (csmsr & 0xa0) == 0x20;
  76 }
  77
  78 int __init pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  79 {
  80         if (is_rm300_revd())
  81                 return irq_tab_rm300d[slot][pin];
  82
  83         return irq_tab_rm200[slot][pin];
  84 }