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// MIT License, Copyright (c) 2020 Marvin Borner
// Uses parts of the ToAruOS Project, released under the terms of the NCSA
// Copyright (C) 2011-2018 K. Lange
#include <cpu.h>
#include <def.h>
#include <mem.h>
#include <pci.h>
void pci_write_field(u32 device, int field, u32 value)
{
outl(PCI_ADDRESS_PORT, pci_get_addr(device, field));
outl(PCI_VALUE_PORT, value);
}
u32 pci_read_field(u32 device, int field, int size)
{
outl(PCI_ADDRESS_PORT, pci_get_addr(device, field));
if (size == 4) {
u32 t = inl(PCI_VALUE_PORT);
return t;
} else if (size == 2) {
u16 t = inw((u16)(PCI_VALUE_PORT + (field & 2)));
return t;
} else if (size == 1) {
u8 t = inb((u16)(PCI_VALUE_PORT + (field & 3)));
return t;
}
return 0xFFFF;
}
u16 pci_find_type(u32 device)
{
return (u16)((pci_read_field(device, PCI_CLASS, 1) << 8) |
pci_read_field(device, PCI_SUBCLASS, 1));
}
void pci_scan_hit(pci_func_t f, u32 dev, void *extra)
{
int dev_vend = (int)pci_read_field(dev, PCI_VENDOR_ID, 2);
int dev_dvid = (int)pci_read_field(dev, PCI_DEVICE_ID, 2);
f(dev, (u16)dev_vend, (u16)dev_dvid, extra);
}
void pci_scan_func(pci_func_t f, int type, int bus, int slot, int func, void *extra)
{
u32 dev = pci_box_device(bus, slot, func);
if (type == -1 || type == pci_find_type(dev))
pci_scan_hit(f, dev, extra);
if (pci_find_type(dev) == PCI_TYPE_BRIDGE)
pci_scan_bus(f, type, (int)pci_read_field(dev, PCI_SECONDARY_BUS, 1), extra);
}
void pci_scan_slot(pci_func_t f, int type, int bus, int slot, void *extra)
{
u32 dev = pci_box_device(bus, slot, 0);
if (pci_read_field(dev, PCI_VENDOR_ID, 2) == PCI_NONE)
return;
pci_scan_func(f, type, bus, slot, 0, extra);
if (!pci_read_field(dev, PCI_HEADER_TYPE, 1))
return;
for (int func = 1; func < 8; func++) {
dev = pci_box_device(bus, slot, func);
if (pci_read_field(dev, PCI_VENDOR_ID, 2) != PCI_NONE)
pci_scan_func(f, type, bus, slot, func, extra);
}
}
void pci_scan_bus(pci_func_t f, int type, int bus, void *extra)
{
for (int slot = 0; slot < 32; ++slot)
pci_scan_slot(f, type, bus, slot, extra);
}
void pci_scan(pci_func_t f, int type, void *extra)
{
if ((pci_read_field(0, PCI_HEADER_TYPE, 1) & 0x80) == 0) {
pci_scan_bus(f, type, 0, extra);
return;
}
for (int func = 0; func < 8; ++func) {
u32 dev = pci_box_device(0, 0, func);
if (pci_read_field(dev, PCI_VENDOR_ID, 2) != PCI_NONE)
pci_scan_bus(f, type, func, extra);
else
break;
}
}
static void find_isa_bridge(u32 device, u16 vendor_id, u16 device_id, void *extra)
{
if (vendor_id == 0x8086 && (device_id == 0x7000 || device_id == 0x7110))
*((u32 *)extra) = device;
}
static u32 pci_isa = 0;
static u8 pci_remaps[4] = { 0 };
// Remap
void pci_install(void)
{
pci_scan(&find_isa_bridge, -1, &pci_isa);
if (pci_isa) {
for (int i = 0; i < 4; ++i) {
pci_remaps[i] = (u8)pci_read_field(pci_isa, 0x60 + i, 1);
if (pci_remaps[i] == 0x80) {
pci_remaps[i] = (u8)(10 + (i % 1));
}
}
u32 out = 0;
memcpy(&out, &pci_remaps, 4);
pci_write_field(pci_isa, 0x60, out);
}
}
int pci_get_interrupt(u32 device)
{
if (pci_isa) {
u32 irq_pin = pci_read_field(device, 0x3D, 1);
if (irq_pin == 0)
return (int)pci_read_field(device, PCI_INTERRUPT_LINE, 1);
int pirq = ((int)irq_pin + pci_extract_slot(device) - 2) % 4;
int int_line = (int)pci_read_field(device, PCI_INTERRUPT_LINE, 1);
if (pci_remaps[pirq] >= 0x80) {
if (int_line == 0xFF) {
int_line = 10;
pci_write_field(device, PCI_INTERRUPT_LINE, (u32)int_line);
}
pci_remaps[pirq] = (u8)int_line;
u32 out = 0;
memcpy(&out, &pci_remaps, 4);
pci_write_field(pci_isa, 0x60, out);
return int_line;
}
pci_write_field(device, PCI_INTERRUPT_LINE, pci_remaps[pirq]);
return pci_remaps[pirq];
} else {
return (int)pci_read_field(device, PCI_INTERRUPT_LINE, 1);
}
}
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