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 /*
  18  * Shortcuts ...
  19  */
  20 #define SCSI    PCIMT_IRQ_SCSI
  21 #define ETH     PCIMT_IRQ_ETHERNET
  22 #define INTA    PCIMT_IRQ_INTA
  23 #define INTB    PCIMT_IRQ_INTB
  24 #define INTC    PCIMT_IRQ_INTC
  25 #define INTD    PCIMT_IRQ_INTD
  26
  27 /*
  28  * Device 0: PCI EISA Bridge    (directly routed)
  29  * Device 1: NCR53c810 SCSI     (directly routed)
  30  * Device 2: PCnet32 Ethernet   (directly routed)
  31  * Device 3: VGA                (routed to INTB)
  32  * Device 4: Unused
  33  * Device 5: Slot 2
  34  * Device 6: Slot 3
  35  * Device 7: Slot 4
  36  *
  37  * Documentation says the VGA is device 5 and device 3 is unused but that
  38  * seem to be a documentation error.  At least on my RM200C the Cirrus
  39  * Logic CL-GD5434 VGA is device 3.
  40  */
  41 static char irq_tab_rm200[8][5] __initdata = {
  42         /*       INTA  INTB  INTC  INTD */
  43         {     0,    0,    0,    0,    0 },      /* EISA bridge */
  44         {  SCSI, SCSI, SCSI, SCSI, SCSI },      /* SCSI */
  45         {   ETH,  ETH,  ETH,  ETH,  ETH },      /* Ethernet */
  46         {  INTB, INTB, INTB, INTB, INTB },      /* VGA */
  47         {     0,    0,    0,    0,    0 },      /* Unused */
  48         {     0, INTB, INTC, INTD, INTA },      /* Slot 2 */
  49         {     0, INTC, INTD, INTA, INTB },      /* Slot 3 */
  50         {     0, INTD, INTA, INTB, INTC },      /* Slot 4 */
  51 };
  52
  53 /*
  54  * In Revision D of the RM300 Device 2 has become a normal purpose Slot 1
  55  *
  56  * The VGA card is optional for RM300 systems.
  57  */
  58 static char irq_tab_rm300d[8][5] __initdata = {
  59         /*       INTA  INTB  INTC  INTD */
  60         {     0,    0,    0,    0,    0 },      /* EISA bridge */
  61         {  SCSI, SCSI, SCSI, SCSI, SCSI },      /* SCSI */
  62         {     0, INTC, INTD, INTA, INTB },      /* Slot 1 */
  63         {  INTB, INTB, INTB, INTB, INTB },      /* VGA */
  64         {     0,    0,    0,    0,    0 },      /* Unused */
  65         {     0, INTB, INTC, INTD, INTA },      /* Slot 2 */
  66         {     0, INTC, INTD, INTA, INTB },      /* Slot 3 */
  67         {     0, INTD, INTA, INTB, INTC },      /* Slot 4 */
  68 };
  69
  70 static inline int is_rm300_revd(void)
  71 {
  72         unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
  73
  74         return (csmsr & 0xa0) == 0x20;
  75 }
  76
  77 int __init pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  78 {
  79         if (is_rm300_revd())
  80                 return irq_tab_rm300d[slot][pin];
  81
  82         return irq_tab_rm200[slot][pin];
  83 }
  84
  85 /* Do platform specific device initialization at pci_enable_device() time */
  86 int pcibios_plat_dev_init(struct pci_dev *dev)
  87 {
  88         return 0;
  89 }