/*
* The PCI Library -- Direct Configuration access via i386 Ports
*
* Copyright (c) 1997--2004 Martin Mares <mj@ucw.cz>
*
* Modified and ported to HelenOS by Jakub Jermar.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <unistd.h>
#include "internal.h"
static inline void outb(u8 b, u16 port)
{
asm volatile ("outb %0, %1\n" : : "a" (b), "d" (port));
}
static inline void outw(u16 w, u16 port)
{
asm volatile ("outw %0, %1\n" : : "a" (w), "d" (port));
}
static inline void outl(u32 l, u16 port)
{
asm volatile ("outl %0, %1\n" : : "a" (l), "d" (port));
}
static inline u8 inb(u16 port)
{
u8 val;
asm volatile ("inb %1, %0 \n" : "=a" (val) : "d" (port));
return val;
}
static inline u16 inw(u16 port)
{
u16 val;
asm volatile ("inw %1, %0 \n" : "=a" (val) : "d" (port));
return val;
}
static inline u32 inl(u16 port)
{
u32 val;
asm volatile ("inl %1, %0 \n" : "=a" (val) : "d" (port));
return val;
}
static void
conf12_init(struct pci_access *a)
{
}
static void
conf12_cleanup(struct pci_access *a UNUSED)
{
}
/*
* Before we decide to use direct hardware access mechanisms, we try to do some
* trivial checks to ensure it at least _seems_ to be working -- we just test
* whether bus 00 contains a host bridge (this is similar to checking
* techniques used in XFree86, but ours should be more reliable since we
* attempt to make use of direct access hints provided by the PCI BIOS).
*
* This should be close to trivial, but it isn't, because there are buggy
* chipsets (yes, you guessed it, by Intel and Compaq) that have no class ID.
*/
static int
intel_sanity_check(struct pci_access *a, struct pci_methods *m)
{
struct pci_dev d;
a->debug("...sanity check");
d.bus = 0;
d.func = 0;
for(d.dev = 0; d.dev < 32; d.dev++)
{
u16 class, vendor;
if (m->read(&d, PCI_CLASS_DEVICE, (byte *) &class, sizeof(class)) &&
(class == cpu_to_le16(PCI_CLASS_BRIDGE_HOST) || class == cpu_to_le16(PCI_CLASS_DISPLAY_VGA)) ||
m->read(&d, PCI_VENDOR_ID, (byte *) &vendor, sizeof(vendor)) &&
(vendor == cpu_to_le16(PCI_VENDOR_ID_INTEL) || vendor == cpu_to_le16(PCI_VENDOR_ID_COMPAQ)))
{
a->debug("...outside the Asylum at 0/%02x/0", d.dev);
return 1;
}
}
a->debug("...insane");
return 0;
}
/*
* Configuration type 1
*/
#define CONFIG_CMD(bus, device_fn, where) (0x80000000 | (bus << 16) | (device_fn << 8) | (where & ~3))
static int
conf1_detect(struct pci_access *a)
{
unsigned int tmp;
int res = 0;
outb (0x01, 0xCFB);
tmp = inl (0xCF8);
outl (0x80000000, 0xCF8);
if (inl (0xCF8) == 0x80000000)
res = 1;
outl (tmp, 0xCF8);
if (res)
res = intel_sanity_check(a, &pm_intel_conf1);
return res;
}
static int
conf1_read(struct pci_dev *d, int pos, byte *buf, int len)
{
int addr = 0xcfc + (pos&3);
if (pos >= 256)
return 0;
outl(0x80000000 | ((d->bus & 0xff) << 16) | (PCI_DEVFN(d->dev, d->func) << 8) | (pos&~3), 0xcf8);
switch (len)
{
case 1:
buf[0] = inb(addr);
break;
case 2:
((u16 *) buf)[0] = cpu_to_le16(inw(addr));
break;
case 4:
((u32 *) buf)[0] = cpu_to_le32(inl(addr));
break;
default:
return pci_generic_block_read(d, pos, buf, len);
}
return 1;
}
static int
conf1_write(struct pci_dev *d, int pos, byte *buf, int len)
{
int addr = 0xcfc + (pos&3);
if (pos >= 256)
return 0;
outl(0x80000000 | ((d->bus & 0xff) << 16) | (PCI_DEVFN(d->dev, d->func) << 8) | (pos&~3), 0xcf8);
switch (len)
{
case 1:
outb(buf[0], addr);
break;
case 2:
outw(le16_to_cpu(((u16 *) buf)[0]), addr);
break;
case 4:
outl(le32_to_cpu(((u32 *) buf)[0]), addr);
break;
default:
return pci_generic_block_write(d, pos, buf, len);
}
return 1;
}
/*
* Configuration type 2. Obsolete and brain-damaged, but existing.
*/
static int
conf2_detect(struct pci_access *a)
{
/* This is ugly and tends to produce false positives. Beware. */
outb(0x00, 0xCFB);
outb(0x00, 0xCF8);
outb(0x00, 0xCFA);
if (inb(0xCF8) == 0x00 && inb(0xCFA) == 0x00)
return intel_sanity_check(a, &pm_intel_conf2);
else
return 0;
}
static int
conf2_read(struct pci_dev *d, int pos, byte *buf, int len)
{
int addr = 0xc000 | (d->dev << 8) | pos;
if (pos >= 256)
return 0;
if (d->dev >= 16)
/* conf2 supports only 16 devices per bus */
return 0;
outb((d->func << 1) | 0xf0, 0xcf8);
outb(d->bus, 0xcfa);
switch (len)
{
case 1:
buf[0] = inb(addr);
break;
case 2:
((u16 *) buf)[0] = cpu_to_le16(inw(addr));
break;
case 4:
((u32 *) buf)[0] = cpu_to_le32(inl(addr));
break;
default:
outb(0, 0xcf8);
return pci_generic_block_read(d, pos, buf, len);
}
outb(0, 0xcf8);
return 1;
}
static int
conf2_write(struct pci_dev *d, int pos, byte *buf, int len)
{
int addr = 0xc000 | (d->dev << 8) | pos;
if (pos >= 256)
return 0;
if (d->dev >= 16)
d->access->error("conf2_write: only first 16 devices exist.");
outb((d->func << 1) | 0xf0, 0xcf8);
outb(d->bus, 0xcfa);
switch (len)
{
case 1:
outb(buf[0], addr);
break;
case 2:
outw(le16_to_cpu(* (u16 *) buf), addr);
break;
case 4:
outl(le32_to_cpu(* (u32 *) buf), addr);
break;
default:
outb(0, 0xcf8);
return pci_generic_block_write(d, pos, buf, len);
}
outb(0, 0xcf8);
return 1;
}
struct pci_methods pm_intel_conf1 = {
"Intel-conf1",
NULL, /* config */
conf1_detect,
conf12_init,
conf12_cleanup,
pci_generic_scan,
pci_generic_fill_info,
conf1_read,
conf1_write,
NULL, /* init_dev */
NULL /* cleanup_dev */
};
struct pci_methods pm_intel_conf2 = {
"Intel-conf2",
NULL, /* config */
conf2_detect,
conf12_init,
conf12_cleanup,
pci_generic_scan,
pci_generic_fill_info,
conf2_read,
conf2_write,
NULL, /* init_dev */
NULL /* cleanup_dev */
};