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/* tag: openbios pci plugin
*
* Copyright (C) 2003 Stefan Reinauer
*
* See the file "COPYING" for further information about
* the copyright and warranty status of this work.
*/
#include <stdio.h>
#include <stdlib.h>
#include "unix/plugins.h"
#include "unix/plugin_pci.h"
#define DEBUG
u32 pci_conf_addr = 0;
pci_dev_t *pci_devices = NULL;
static pci_dev_t *find_device(u32 conf_addr)
{
pci_dev_t *devs = pci_devices;
unsigned bus = (conf_addr >> 16) & 0xff;
unsigned dev = (conf_addr >> 11) & 0x1f;
unsigned fn = (conf_addr >> 8) & 0x7;
// printf("Looking for device %x\n",conf_addr);
while (devs) {
if (devs->bus == bus && devs->dev == dev && devs->fn == fn)
return devs;
devs = devs->next;
}
return NULL;
}
/*
* IO functions. These manage all the magic of providing a PCI
* compatible interface to OpenBIOS' unix version of the kernel.
*/
static u8 pci_inb(u32 reg)
{
u32 basereg = (reg & 0xfffc);
u32 basepos = (reg & 0x03);
pci_dev_t *dev;
if (basereg == 0xcf8) {
return (pci_conf_addr >> (basepos << 3));
}
/* still here? so we're 0xCFC */
dev = find_device(pci_conf_addr);
if (!dev || !dev->config)
return 0xff;
return dev->config[(pci_conf_addr + basepos) & 0xff];
}
static u16 pci_inw(u32 reg)
{
u32 basereg = (reg & 0xfffc);
u32 basepos = (reg & 0x02);
pci_dev_t *dev;
if (basereg == 0xcf8) {
return (pci_conf_addr >> (basepos << 3));
}
/* still here? so we're 0xCFC */
dev = find_device(pci_conf_addr);
if (!dev || !dev->config)
return 0xffff;
return *(u16 *) (dev->config + ((pci_conf_addr + basepos) & 0xff));
}
static u32 pci_inl(u32 reg)
{
u32 basereg = (reg & 0xfffc);
pci_dev_t *dev;
if (basereg == 0xcf8) {
return pci_conf_addr;
}
/* still here? so we're 0xCFC */
dev = find_device(pci_conf_addr);
if (!dev || !dev->config)
return 0xffffffff;
return *(u32 *) (dev->config + (pci_conf_addr & 0xff));
}
static void pci_outb(u32 reg, u8 val)
{
u32 basereg = (reg & 0xfffc);
u32 basepos = (reg & 0x03);
pci_dev_t *dev;
if (basereg == 0xcf8) {
pci_conf_addr &= (~(0xff << (basepos << 3)));
pci_conf_addr |= (val << (basepos << 3));
return;
}
/* still here? so we're 0xCFC */
dev = find_device(pci_conf_addr);
if (!dev || !dev->config)
return;
dev->config[pci_conf_addr & 0xff] = val;
}
static void pci_outw(u32 reg, u16 val)
{
u32 basereg = (reg & 0xfffc);
u32 basepos = (reg & 0x02);
pci_dev_t *dev;
if (basereg == 0xcf8) {
pci_conf_addr &= (~(0xffff << (basepos << 3)));
pci_conf_addr |= (val << (basepos << 3));
return;
}
/* still here? so we're 0xCFC */
dev = find_device(pci_conf_addr);
if (!dev || !dev->config)
return;
*(u16 *) (dev->config + (pci_conf_addr & 0xff)) = val;
}
static void pci_outl(u32 reg, u32 val)
{
u32 basereg = (reg & 0xfffc);
pci_dev_t *dev;
if (basereg == 0xcf8) {
pci_conf_addr = val;
return;
}
/* still here? so we're 0xCFC */
dev = find_device(pci_conf_addr);
if (!dev || !dev->config)
return;
*(u32 *) (dev->config + (pci_conf_addr & 0xff)) = val;
}
static io_ops_t pci_io_ops = {
inb:pci_inb,
inw:pci_inw,
inl:pci_inl,
outb:pci_outb,
outw:pci_outw,
outl:pci_outl
};
/*
* Functions visible to modules depending on this module.
*/
int pci_register_device(unsigned bus, unsigned dev, unsigned fn,
u8 * config)
{
pci_dev_t *newdev;
u32 caddr = (1 << 31) | (bus << 16) | (dev << 11) | (fn << 8);
if (find_device(caddr)) {
printf("Error: pci device %02x:%02x.%01x already exists\n",
bus, dev, fn);
return -1;
}
newdev = malloc(sizeof(pci_dev_t));
if (!newdev) {
printf("Out of memory\n");
return -1;
}
newdev->bus = bus;
newdev->dev = dev;
newdev->fn = fn;
newdev->config = config;
newdev->next = pci_devices;
pci_devices = newdev;
return 0;
}
/*
* Initialization is really simple. We just grab the
* PCI conf1 io range for our emulation functions.
*/
extern int plugin_pci_init( void );
int plugin_pci_init(void)
{
#ifdef DEBUG
printf("Plugin \"pci\" initializing... ");
#endif
register_iorange("pci", &pci_io_ops, 0xcf8, 0xcff);
#ifdef DEBUG
printf("done.\n");
#endif
return 0;
}
/* plugin meta information available for the plugin loader */
PLUGIN_AUTHOR ("Stefan Reinauer <stepan@openbios.org>")
PLUGIN_DESCRIPTION ("Generic PCI Device Emulation")
PLUGIN_LICENSE ("GPL v2")
/* This plugin has no dependencies. Otherwise the following
* macro would be uncommented:
* PLUGIN_DEPENDENCIES ("this", "that")
*/
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