arch/arm/common/via82c505.c

   1 #include <linux/kernel.h>
   2 #include <linux/pci.h>
   3 #include <linux/interrupt.h>
   4 #include <linux/mm.h>
   5 #include <linux/init.h>
   6 #include <linux/ioport.h>
   7 #include <linux/io.h>
   8
   9 #include <asm/system.h>
  10
  11 #include <asm/mach/pci.h>
  12
  13 #define MAX_SLOTS               7
  14
  15 #define CONFIG_CMD(bus, devfn, where)   (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
  16
  17 static int
  18 via82c505_read_config(struct pci_bus *bus, unsigned int devfn, int where,
  19                       int size, u32 *value)
  20 {
  21         outl(CONFIG_CMD(bus,devfn,where),0xCF8);
  22         switch (size) {
  23         case 1:
  24                 *value=inb(0xCFC + (where&3));
  25                 break;
  26         case 2:
  27                 *value=inw(0xCFC + (where&2));
  28                 break;
  29         case 4:
  30                 *value=inl(0xCFC);
  31                 break;
  32         }
  33         return PCIBIOS_SUCCESSFUL;
  34 }
  35
  36 static int
  37 via82c505_write_config(struct pci_bus *bus, unsigned int devfn, int where,
  38                        int size, u32 value)
  39 {
  40         outl(CONFIG_CMD(bus,devfn,where),0xCF8);
  41         switch (size) {
  42         case 1:
  43                 outb(value, 0xCFC + (where&3));
  44                 break;
  45         case 2:
  46                 outw(value, 0xCFC + (where&2));
  47                 break;
  48         case 4:
  49                 outl(value, 0xCFC);
  50                 break;
  51         }
  52         return PCIBIOS_SUCCESSFUL;
  53 }
  54
  55 static struct pci_ops via82c505_ops = {
  56         .read   = via82c505_read_config,
  57         .write  = via82c505_write_config,
  58 };
  59
  60 void __init via82c505_preinit(void)
  61 {
  62         printk(KERN_DEBUG "PCI: VIA 82c505\n");
  63         if (!request_region(0xA8,2,"via config")) {
  64                 printk(KERN_WARNING"VIA 82c505: Unable to request region 0xA8\n");
  65                 return;
  66         }
  67         if (!request_region(0xCF8,8,"pci config")) {
  68                 printk(KERN_WARNING"VIA 82c505: Unable to request region 0xCF8\n");
  69                 release_region(0xA8, 2);
  70                 return;
  71         }
  72
  73         /* Enable compatible Mode */
  74         outb(0x96,0xA8);
  75         outb(0x18,0xA9);
  76         outb(0x93,0xA8);
  77         outb(0xd0,0xA9);
  78
  79 }
  80
  81 int __init via82c505_setup(int nr, struct pci_sys_data *sys)
  82 {
  83         return (nr == 0);
  84 }
  85
  86 struct pci_bus * __init via82c505_scan_bus(int nr, struct pci_sys_data *sysdata)
  87 {
  88         if (nr == 0)
  89                 return pci_scan_root_bus(NULL, 0, &via82c505_ops, sysdata,
  90                                          &sysdata->resources);
  91
  92         return NULL;
  93 }