1 /* SPDX-License-Identifier: GPL-2.0-only */
2
3 #include <acpi/acpigen.h>
4 #include <acpi/acpigen_pci.h>
5 #include <device/pci_def.h>
6 #include <device/pci_ops.h>
7
8 #include "acpi_pirq_gen.h"
9
gen_apic_route(const struct slot_pin_irq_map * pin_irq_map,unsigned int map_count)10 static void gen_apic_route(const struct slot_pin_irq_map *pin_irq_map,
11 unsigned int map_count)
12 {
13 for (unsigned int i = 0; i < map_count; i++)
14 /*
15 * The reason for subtracting PCI_INT_A from the pin given is
16 * that PCI defines pins as 1-4, and _PRT uses 0-3.
17 */
18 acpigen_write_PRT_GSI_entry(pin_irq_map[i].slot,
19 pin_irq_map[i].pin - PCI_INT_A,
20 pin_irq_map[i].apic_gsi);
21 }
22
gen_pic_route(const struct slot_pin_irq_map * pin_irq_map,unsigned int map_count,const struct pic_pirq_map * pirq_map)23 static void gen_pic_route(const struct slot_pin_irq_map *pin_irq_map,
24 unsigned int map_count,
25 const struct pic_pirq_map *pirq_map)
26 {
27 for (unsigned int i = 0; i < map_count; i++) {
28 const enum pirq pirq = pin_irq_map[i].pic_pirq;
29 const unsigned int pin = pin_irq_map[i].pin - PCI_INT_A;
30 if (pirq == PIRQ_INVALID)
31 continue;
32
33 const size_t pirq_index = pirq_idx(pirq);
34 if (pirq_map->type == PIRQ_GSI)
35 acpigen_write_PRT_GSI_entry(pin_irq_map[i].slot,
36 pin,
37 pirq_map->gsi[pirq_index]);
38 else
39 acpigen_write_PRT_source_entry(pin_irq_map[i].slot,
40 pin,
41 pirq_map->source_path[pirq_index],
42 0);
43 }
44 }
45
intel_write_pci0_PRT(const struct slot_pin_irq_map * pin_irq_map,unsigned int map_count,const struct pic_pirq_map * pirq_map)46 void intel_write_pci0_PRT(const struct slot_pin_irq_map *pin_irq_map,
47 unsigned int map_count,
48 const struct pic_pirq_map *pirq_map)
49 {
50 /* \_SB.PCI0._PRT */
51 acpigen_write_scope("\\_SB.PCI0");
52 acpigen_write_method("_PRT", 0);
53 acpigen_write_if();
54 acpigen_emit_namestring("PICM");
55 acpigen_emit_byte(RETURN_OP);
56 acpigen_write_package(map_count);
57 gen_apic_route(pin_irq_map, map_count);
58 acpigen_pop_len(); /* package */
59 acpigen_write_else();
60 acpigen_emit_byte(RETURN_OP);
61 acpigen_write_package(map_count);
62 gen_pic_route(pin_irq_map, map_count, pirq_map);
63 acpigen_pop_len(); /* package */
64 acpigen_pop_len(); /* else PICM */
65 acpigen_pop_len(); /* _PRT */
66 acpigen_pop_len(); /* \_SB */
67 }
68
is_slot_pin_assigned(const struct slot_pin_irq_map * pin_irq_map,unsigned int map_count,unsigned int slot,enum pci_pin pin)69 bool is_slot_pin_assigned(const struct slot_pin_irq_map *pin_irq_map,
70 unsigned int map_count, unsigned int slot,
71 enum pci_pin pin)
72 {
73 for (size_t i = 0; i < map_count; i++) {
74 if (pin_irq_map[i].slot == slot && pin_irq_map[i].pin == pin)
75 return true;
76 }
77
78 return false;
79 }
80