| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <arch/acpigen.h> |
| #include <console/console.h> |
| #include <device/pci_def.h> |
| #include <device/pci_ops.h> |
| #include <string.h> |
| |
| #include "acpi_pirq_gen.h" |
| |
| enum emit_type { |
| EMIT_APIC, |
| EMIT_PICM, |
| }; |
| |
| static int create_pirq_matrix(char matrix[32][4]) |
| { |
| struct device *dev; |
| int num_devs = 0; |
| |
| for (dev = pcidev_on_root(0, 0); dev; dev = dev->sibling) { |
| u8 pci_dev; |
| u8 int_pin; |
| |
| pci_dev = PCI_SLOT(dev->path.pci.devfn); |
| int_pin = pci_read_config8(dev, PCI_INTERRUPT_PIN); |
| |
| if (int_pin == PCI_INT_NONE || int_pin > PCI_INT_D || |
| matrix[pci_dev][int_pin - PCI_INT_A] |
| != PIRQ_NONE) |
| continue; |
| |
| matrix[pci_dev][int_pin - PCI_INT_A] = |
| intel_common_map_pirq(dev, int_pin); |
| printk(BIOS_SPEW, "ACPI_PIRQ_GEN: %s: pin=%d pirq=%d\n", |
| dev_path(dev), int_pin - PCI_INT_A, |
| matrix[pci_dev][int_pin - PCI_INT_A] - PIRQ_A); |
| num_devs++; |
| } |
| return num_devs; |
| } |
| |
| static void gen_pirq_route(const enum emit_type emit, const char *lpcb_path, |
| char pci_int_mapping[32][4]) |
| { |
| int pci_dev, int_pin; |
| char buffer[DEVICE_PATH_MAX]; |
| char pirq; |
| |
| for (pci_dev = 0; pci_dev < 32; pci_dev++) { |
| for (int_pin = 0; int_pin < 4; int_pin++) { |
| pirq = pci_int_mapping[pci_dev][int_pin]; |
| if (pirq == PIRQ_NONE) |
| continue; |
| acpigen_write_package(4); |
| acpigen_write_dword((pci_dev << 16) | 0xffff); |
| acpigen_write_byte(int_pin); |
| if (emit == EMIT_APIC) { |
| acpigen_write_zero(); |
| acpigen_write_dword(16 + pirq - PIRQ_A); |
| } else { |
| snprintf(buffer, sizeof(buffer), |
| "%s.LNK%c", |
| lpcb_path, 'A' + pirq - PIRQ_A); |
| acpigen_emit_namestring(buffer); |
| acpigen_write_dword(0); |
| } |
| acpigen_pop_len(); |
| } |
| } |
| } |
| |
| void intel_acpi_gen_def_acpi_pirq(struct device *dev) |
| { |
| const char *lpcb_path = acpi_device_path(dev); |
| char pci_int_mapping[32][4]; |
| int num_devs; |
| |
| printk(BIOS_DEBUG, "Generating ACPI PIRQ entries\n"); |
| |
| if (!lpcb_path) { |
| printk(BIOS_ERR, "ACPI_PIRQ_GEN: Missing LPCB ACPI path\n"); |
| return; |
| } |
| |
| memset(pci_int_mapping, 0, sizeof(pci_int_mapping)); |
| num_devs = create_pirq_matrix(pci_int_mapping); |
| |
| acpigen_write_scope("\\_SB.PCI0"); |
| acpigen_write_method("_PRT", 0); |
| acpigen_write_if(); |
| acpigen_emit_namestring("PICM"); |
| acpigen_emit_byte(RETURN_OP); |
| acpigen_write_package(num_devs); |
| gen_pirq_route(EMIT_APIC, lpcb_path, pci_int_mapping); |
| acpigen_pop_len(); /* package */ |
| acpigen_pop_len(); /* if PICM */ |
| acpigen_write_else(); |
| acpigen_emit_byte(RETURN_OP); |
| acpigen_write_package(num_devs); |
| gen_pirq_route(EMIT_PICM, lpcb_path, pci_int_mapping); |
| acpigen_pop_len(); /* package */ |
| acpigen_pop_len(); /* else PICM */ |
| acpigen_pop_len(); /* _PRT */ |
| acpigen_pop_len(); /* \_SB */ |
| } |