1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
5 * Part of this file is ported from coreboot src/arch/x86/boot/pirq_routing.c
11 #include <asm/pirq_routing.h>
13 static u8 pirq_get_next_free_irq(struct udevice *dev, u8 *pirq, u16 bitmap,
14 bool irq_already_routed[])
19 /* IRQ sharing starts from IRQ#3 */
20 for (i = 3; i < 16; i++) {
21 /* Can we assign this IRQ? */
22 if (!((bitmap >> i) & 1))
25 /* We can, now let's assume we can use this IRQ */
28 /* Have we already routed it? */
29 if (irq_already_routed[irq])
32 for (link = 0; link < CONFIG_MAX_PIRQ_LINKS; link++) {
33 if (pirq_check_irq_routed(dev, link, irq)) {
34 irq_already_routed[irq] = true;
39 /* If it's not yet routed, use it */
40 if (!irq_already_routed[irq]) {
41 irq_already_routed[irq] = true;
45 /* But if it was already routed, try the next one */
48 /* Now we get our IRQ */
52 void pirq_route_irqs(struct udevice *dev, struct irq_info *irq, int num)
54 unsigned char irq_slot[MAX_INTX_ENTRIES];
55 unsigned char pirq[CONFIG_MAX_PIRQ_LINKS];
56 bool irq_already_routed[16];
59 memset(pirq, 0, CONFIG_MAX_PIRQ_LINKS);
60 memset(irq_already_routed, '\0', sizeof(irq_already_routed));
63 for (i = 0; i < num; i++) {
64 debug("PIRQ Entry %d Dev: %d.%x.%d\n", i,
65 irq->bus, irq->devfn >> 3, irq->devfn & 7);
67 for (intx = 0; intx < MAX_INTX_ENTRIES; intx++) {
68 int link = irq->irq[intx].link;
69 int bitmap = irq->irq[intx].bitmap;
72 debug("INT%c link: %x bitmap: %x ",
73 'A' + intx, link, bitmap);
75 if (!bitmap || !link) {
76 debug("not routed\n");
81 /* translate link value to link number */
82 link = pirq_translate_link(dev, link);
86 irq = pirq_get_next_free_irq(dev, pirq, bitmap,
93 debug("IRQ: %d\n", irq);
96 /* Assign IRQ in the interrupt router */
97 pirq_assign_irq(dev, link, irq);
100 /* Bus, device, slots IRQs for {A,B,C,D} */
101 pci_assign_irqs(irq->bus, irq->devfn >> 3, irq_slot);
106 for (i = 0; i < CONFIG_MAX_PIRQ_LINKS; i++)
107 debug("PIRQ%c: %d\n", 'A' + i, pirq[i]);
110 u32 copy_pirq_routing_table(u32 addr, struct irq_routing_table *rt)
112 struct irq_routing_table *rom_rt;
114 /* Align the table to be 16 byte aligned */
115 addr = ALIGN(addr, 16);
117 debug("Copying Interrupt Routing Table to 0x%x\n", addr);
118 memcpy((void *)(uintptr_t)addr, rt, rt->size);
121 * We do the sanity check here against the copied table after memcpy,
122 * as something might go wrong after the memcpy, which is normally
123 * due to the F segment decode is not turned on to systeam RAM.
125 rom_rt = (struct irq_routing_table *)(uintptr_t)addr;
126 if (rom_rt->signature != PIRQ_SIGNATURE ||
127 rom_rt->version != PIRQ_VERSION || rom_rt->size % 16) {
128 printf("Interrupt Routing Table not valid\n");
132 return addr + rt->size;