119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <asm/pci-direct.h>
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#include <asm/io.h>
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#include <asm/pci_x86.h>
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/* Direct PCI access. This is used for PCI accesses in early boot before
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the PCI subsystem works. */
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u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset)
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{
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u32 v;
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outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
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v = inl(0xcfc);
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if (v != 0xffffffff)
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pr_debug("%x reading 4 from %x: %x\n", slot, offset, v);
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return v;
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}
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u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset)
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{
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u8 v;
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outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
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v = inb(0xcfc + (offset&3));
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pr_debug("%x reading 1 from %x: %x\n", slot, offset, v);
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return v;
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}
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u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset)
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{
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u16 v;
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outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
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v = inw(0xcfc + (offset&2));
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pr_debug("%x reading 2 from %x: %x\n", slot, offset, v);
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return v;
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}
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void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset,
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u32 val)
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{
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pr_debug("%x writing to %x: %x\n", slot, offset, val);
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outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
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outl(val, 0xcfc);
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}
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void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val)
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{
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pr_debug("%x writing to %x: %x\n", slot, offset, val);
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outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
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outb(val, 0xcfc + (offset&3));
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}
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void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val)
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{
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pr_debug("%x writing to %x: %x\n", slot, offset, val);
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outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
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outw(val, 0xcfc + (offset&2));
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}
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int early_pci_allowed(void)
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{
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return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
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PCI_PROBE_CONF1;
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}
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void early_dump_pci_device(u8 bus, u8 slot, u8 func)
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{
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int i;
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int j;
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u32 val;
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printk(KERN_INFO "pci 0000:%02x:%02x.%d config space:",
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bus, slot, func);
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for (i = 0; i < 256; i += 4) {
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if (!(i & 0x0f))
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printk("\n %02x:",i);
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val = read_pci_config(bus, slot, func, i);
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for (j = 0; j < 4; j++) {
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printk(" %02x", val & 0xff);
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val >>= 8;
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}
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}
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printk("\n");
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}
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void early_dump_pci_devices(void)
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{
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unsigned bus, slot, func;
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if (!early_pci_allowed())
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return;
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for (bus = 0; bus < 256; bus++) {
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for (slot = 0; slot < 32; slot++) {
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for (func = 0; func < 8; func++) {
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u32 class;
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u8 type;
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class = read_pci_config(bus, slot, func,
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PCI_CLASS_REVISION);
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if (class == 0xffffffff)
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continue;
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early_dump_pci_device(bus, slot, func);
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if (func == 0) {
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type = read_pci_config_byte(bus, slot,
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func,
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PCI_HEADER_TYPE);
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if (!(type & 0x80))
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break;
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}
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}
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}
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}
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}
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