| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <acpi/acpi_device.h> |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <stdlib.h> |
| #include <southbridge/intel/common/acpi_pirq_gen.h> |
| #include <southbridge/intel/common/rcba_pirq.h> |
| #include <southbridge/intel/common/rcba.h> |
| |
| #define MAX_SLOT 31 |
| #define MIN_SLOT 19 |
| |
| static const u32 pirq_dir_route_reg[MAX_SLOT - MIN_SLOT + 1] = { |
| D19IR, D20IR, D21IR, D22IR, D23IR, 0, D25IR, |
| D26IR, D27IR, D28IR, D29IR, D30IR, D31IR, |
| }; |
| |
| static enum pirq map_pirq(const struct device *dev, const enum pci_pin pci_pin) |
| { |
| u8 slot = PCI_SLOT(dev->path.pci.devfn); |
| u8 shift = 4 * (pci_pin - PCI_INT_A); |
| u8 pirq; |
| u16 reg; |
| |
| if (pci_pin < PCI_INT_A || pci_pin > PCI_INT_D) { |
| printk(BIOS_ERR, "ACPI_PIRQ_GEN: Slot %d PCI pin %d out of bounds\n", |
| slot, pci_pin); |
| return PIRQ_INVALID; |
| } |
| |
| /* Slot 24 should not exist and has no D24IR but better be safe here */ |
| if (slot < MIN_SLOT || slot > MAX_SLOT || slot == 24) { |
| /* non-PCH devices use 1:1 mapping. */ |
| return (enum pirq)pci_pin; |
| } |
| |
| reg = pirq_dir_route_reg[slot - MIN_SLOT]; |
| |
| pirq = (RCBA16(reg) >> shift) & 0x7; |
| |
| return (enum pirq)(pirq + PIRQ_A); |
| } |
| |
| void intel_acpi_gen_def_acpi_pirq(const struct device *lpc) |
| { |
| struct slot_pin_irq_map *pin_irq_map; |
| const char *lpcb_path = acpi_device_path(lpc); |
| struct pic_pirq_map pirq_map = {0}; |
| unsigned int map_count = 0; |
| int i; |
| |
| if (!lpcb_path) { |
| printk(BIOS_ERR, "ACPI_PIRQ_GEN: Missing LPCB ACPI path\n"); |
| return; |
| } |
| |
| printk(BIOS_DEBUG, "Generating ACPI PIRQ entries\n"); |
| |
| pin_irq_map = calloc(MAX_SLOTS * PCI_INT_MAX, sizeof(struct slot_pin_irq_map)); |
| pirq_map.type = PIRQ_SOURCE_PATH; |
| for (i = 0; i < PIRQ_COUNT; i++) |
| snprintf(pirq_map.source_path[i], sizeof(pirq_map.source_path[i]), |
| "%s.LNK%c", lpcb_path, 'A' + i); |
| |
| for (struct device *dev = pcidev_on_root(0, 0); dev; dev = dev->sibling) { |
| const u8 pci_dev = PCI_SLOT(dev->path.pci.devfn); |
| const u8 int_pin = pci_read_config8(dev, PCI_INTERRUPT_PIN); |
| |
| if (int_pin < PCI_INT_A || int_pin > PCI_INT_D) |
| continue; |
| |
| if (is_slot_pin_assigned(pin_irq_map, map_count, pci_dev, int_pin)) |
| continue; |
| |
| enum pirq pirq = map_pirq(dev, int_pin); |
| if (pirq == PIRQ_INVALID) |
| continue; |
| |
| pin_irq_map[map_count].slot = pci_dev; |
| pin_irq_map[map_count].pin = (enum pci_pin)int_pin; |
| pin_irq_map[map_count].pic_pirq = pirq; |
| /* PIRQs are mapped to GSIs starting at 16 */ |
| pin_irq_map[map_count].apic_gsi = 16 + pirq_idx(pirq); |
| printk(BIOS_SPEW, "ACPI_PIRQ_GEN: %s: pin=%d pirq=%zd\n", |
| dev_path(dev), int_pin - PCI_INT_A, |
| pirq_idx(pin_irq_map[map_count].pic_pirq)); |
| map_count++; |
| } |
| |
| intel_write_pci0_PRT(pin_irq_map, map_count, &pirq_map); |
| |
| free(pin_irq_map); |
| } |