LXR linux-old/arch/i386/kernel/pci-visws.c

   1/*
   2 *      Low-Level PCI Support for SGI Visual Workstation
   3 *
   4 *      (c) 1999--2000 Martin Mares <mj@ucw.cz>
   5 */
   6
   7#include <linux/config.h>
   8#include <linux/types.h>
   9#include <linux/kernel.h>
  10#include <linux/sched.h>
  11#include <linux/pci.h>
  12#include <linux/init.h>
  13#include <linux/irq.h>
  14
  15#include <asm/smp.h>
  16#include <asm/lithium.h>
  17#include <asm/io.h>
  18
  19#include "pci-i386.h"
  20
  21unsigned int pci_probe = 0;
  22
  23/*
  24 *  The VISWS uses configuration access type 1 only.
  25 */
  26
  27#define CONFIG_CMD(dev, where)   (0x80000000 | (dev->bus->number << 16) | (dev->devfn << 8) | (where & ~3))
  28
  29static int pci_conf1_read_config_byte(struct pci_dev *dev, int where, u8 *value)
  30{
  31        outl(CONFIG_CMD(dev,where), 0xCF8);
  32        *value = inb(0xCFC + (where&3));
  33        return PCIBIOS_SUCCESSFUL;
  34}
  35
  36static int pci_conf1_read_config_word(struct pci_dev *dev, int where, u16 *value)
  37{
  38        outl(CONFIG_CMD(dev,where), 0xCF8);    
  39        *value = inw(0xCFC + (where&2));
  40        return PCIBIOS_SUCCESSFUL;    
  41}
  42
  43static int pci_conf1_read_config_dword(struct pci_dev *dev, int where, u32 *value)
  44{
  45        outl(CONFIG_CMD(dev,where), 0xCF8);
  46        *value = inl(0xCFC);
  47        return PCIBIOS_SUCCESSFUL;    
  48}
  49
  50static int pci_conf1_write_config_byte(struct pci_dev *dev, int where, u8 value)
  51{
  52        outl(CONFIG_CMD(dev,where), 0xCF8);    
  53        outb(value, 0xCFC + (where&3));
  54        return PCIBIOS_SUCCESSFUL;
  55}
  56
  57static int pci_conf1_write_config_word(struct pci_dev *dev, int where, u16 value)
  58{
  59        outl(CONFIG_CMD(dev,where), 0xCF8);
  60        outw(value, 0xCFC + (where&2));
  61        return PCIBIOS_SUCCESSFUL;
  62}
  63
  64static int pci_conf1_write_config_dword(struct pci_dev *dev, int where, u32 value)
  65{
  66        outl(CONFIG_CMD(dev,where), 0xCF8);
  67        outl(value, 0xCFC);
  68        return PCIBIOS_SUCCESSFUL;
  69}
  70
  71#undef CONFIG_CMD
  72
  73static struct pci_ops visws_pci_ops = {
  74        pci_conf1_read_config_byte,
  75        pci_conf1_read_config_word,
  76        pci_conf1_read_config_dword,
  77        pci_conf1_write_config_byte,
  78        pci_conf1_write_config_word,
  79        pci_conf1_write_config_dword
  80};
  81
  82static void __init pcibios_fixup_irqs(void)
  83{
  84        struct pci_dev *dev, *p;
  85        u8 pin;
  86        int irq;
  87
  88        pci_for_each_dev(dev) {
  89                pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
  90                dev->irq = 0;
  91                if (!pin)
  92                        continue;
  93                pin--;
  94                if (dev->bus->parent) {
  95                        p = dev->bus->parent->self;
  96                        pin = (pin + PCI_SLOT(dev->devfn)) % 4;
  97                } else
  98                        p = dev;
  99                irq = visws_get_PCI_irq_vector(p->bus->number, PCI_SLOT(p->devfn), pin+1);
 100                if (irq >= 0)
 101                        dev->irq = irq;
 102                DBG("PCI IRQ: %s pin %d -> %d\n", dev->slot_name, pin, irq);
 103        }
 104}
 105
 106void __init pcibios_fixup_bus(struct pci_bus *b)
 107{
 108        pci_read_bridge_bases(b);
 109}
 110
 111#if 0
 112static struct resource visws_pci_bus_resources[2] = {
 113        { "Host bus 1", 0xf4000000, 0xf7ffffff, 0 },
 114        { "Host bus 2", 0xf0000000, 0xf3ffffff, 0 }
 115};
 116#endif
 117
 118void __init pcibios_init(void)
 119{
 120        unsigned int sec_bus = li_pcib_read16(LI_PCI_BUSNUM) & 0xff;
 121
 122        printk("PCI: Probing PCI hardware on host buses 00 and %02x\n", sec_bus);
 123        pci_scan_bus(0, &visws_pci_ops, NULL);
 124        pci_scan_bus(sec_bus, &visws_pci_ops, NULL);
 125        pcibios_fixup_irqs();
 126        pcibios_resource_survey();
 127}
 128
 129char * __init pcibios_setup(char *str)
 130{
 131        return str;
 132}
 133
 134int pcibios_enable_device(struct pci_dev *dev, int mask)
 135{
 136        return pcibios_enable_resources(dev, mask);
 137}
 138
 139void __init pcibios_penalize_isa_irq(irq)
 140{
 141}
 142