arch/i386/kernel/pci-visws.c

   1 /*
   2  *      Low-Level PCI Support for SGI Visual Workstation
   3  *
   4  *      (c) 1999--2000 Martin Mares <mj@suse.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
  21 unsigned 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
  29 static 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
  36 static 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
  43 static 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
  50 static 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
  57 static 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
  64 static 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
  73 static 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
  82 static 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
 106 void __init pcibios_fixup_bus(struct pci_bus *b)
 107 {
 108         pci_read_bridge_bases(b);
 109 }
 110
 111 #if 0
 112 static 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
 118 void __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
 129 char * __init pcibios_setup(char *str)
 130 {
 131         return str;
 132 }
 133
 134 int pcibios_enable_device(struct pci_dev *dev)
 135 {
 136         return pcibios_enable_resources(dev);
 137 }
 138
 139 void __init pcibios_penalize_isa_irq(irq)
 140 {
 141 }