81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/**
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* @file modules/piix4.c
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* @brief Intel PIIX4 ISA Bridge Driver
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*
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* @copyright
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2021 K. Lange
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*/
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#include <errno.h>
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#include <kernel/types.h>
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#include <kernel/args.h>
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#include <kernel/printf.h>
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#include <kernel/pci.h>
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#include <kernel/module.h>
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#define PIIX4_PCI_PIRQRC 0x60
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static void find_isa_bridge(uint32_t device, uint16_t vendorid, uint16_t deviceid, void * extra) {
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if (vendorid == 0x8086 && (deviceid == 0x7000 || deviceid == 0x7110)) {
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*((uint32_t *)extra) = device;
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}
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}
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static uint32_t pci_isa = 0;
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static int pci_isa_base_slot = 0;
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static int pci_isa_bus_offset = 0;
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static int pci_isa_last_bus = 0;
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static uint8_t pci_remaps[4] = {0};
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static void piix_remap(uint32_t device, uint16_t vendorid, uint16_t deviceid, void * extra) {
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uint32_t irq_pin = pci_read_field(device, PCI_INTERRUPT_PIN, 1);
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uint32_t irq_line = pci_read_field(device, PCI_INTERRUPT_LINE, 1);
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if (irq_pin == 0) return;
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if (pci_extract_bus(device) != pci_isa_last_bus) {
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pci_isa_bus_offset++;
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pci_isa_last_bus = pci_extract_bus(device);
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}
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/* Calculate PIRQ from pin and device slot. */
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int slot = (pci_extract_slot(device) - pci_isa_base_slot) % 4;
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int bus = (pci_isa_bus_offset) % 4;
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int pirq = (slot + irq_pin + bus - 1) % 4;
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if (irq_line < 32 && irq_line != pci_remaps[pirq]) {
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pci_write_field(device, PCI_INTERRUPT_LINE, 1, pci_remaps[pirq]);
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}
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}
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static int init(int argc, char * argv[]) {
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if (args_present("nopciremap")) return -ENODEV;
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pci_scan(&find_isa_bridge, -1, &pci_isa);
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if (!pci_isa) {
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return -ENODEV;
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}
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pci_isa_base_slot = pci_extract_slot(pci_isa);
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pci_isa_last_bus = pci_extract_bus(pci_isa);
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for (int i = 0; i < 4; ++i) {
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pci_remaps[i] = pci_read_field(pci_isa, PIIX4_PCI_PIRQRC + i, 1);
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}
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uint32_t out = 0;
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memcpy(&out, &pci_remaps, 4);
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pci_write_field(pci_isa, PIIX4_PCI_PIRQRC, 4, out);
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pci_scan(piix_remap, -1, NULL);
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return 0;
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}
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static int fini(void) {
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return 0;
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}
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struct Module metadata = {
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.name = "piix4",
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.init = init,
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.fini = fini,
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};
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