2 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
4 * Part of this file is ported from coreboot src/arch/x86/boot/pirq_routing.c
6 * SPDX-License-Identifier: GPL-2.0+
12 #include <asm/pirq_routing.h>
13 #include <asm/tables.h>
15 static bool irq_already_routed[16];
17 static u8 pirq_get_next_free_irq(struct udevice *dev, u8 *pirq, u16 bitmap)
22 /* IRQ sharing starts from IRQ#3 */
23 for (i = 3; i < 16; i++) {
24 /* Can we assign this IRQ? */
25 if (!((bitmap >> i) & 1))
28 /* We can, now let's assume we can use this IRQ */
31 /* Have we already routed it? */
32 if (irq_already_routed[irq])
35 for (link = 0; link < CONFIG_MAX_PIRQ_LINKS; link++) {
36 if (pirq_check_irq_routed(dev, link, irq)) {
37 irq_already_routed[irq] = true;
42 /* If it's not yet routed, use it */
43 if (!irq_already_routed[irq]) {
44 irq_already_routed[irq] = true;
48 /* But if it was already routed, try the next one */
51 /* Now we get our IRQ */
55 void pirq_route_irqs(struct udevice *dev, struct irq_info *irq, int num)
57 unsigned char irq_slot[MAX_INTX_ENTRIES];
58 unsigned char pirq[CONFIG_MAX_PIRQ_LINKS];
61 memset(pirq, 0, CONFIG_MAX_PIRQ_LINKS);
64 for (i = 0; i < num; i++) {
65 debug("PIRQ Entry %d Dev: %d.%x.%d\n", i,
66 irq->bus, irq->devfn >> 3, irq->devfn & 7);
68 for (intx = 0; intx < MAX_INTX_ENTRIES; intx++) {
69 int link = irq->irq[intx].link;
70 int bitmap = irq->irq[intx].bitmap;
73 debug("INT%c link: %x bitmap: %x ",
74 'A' + intx, link, bitmap);
76 if (!bitmap || !link) {
77 debug("not routed\n");
82 /* translate link value to link number */
83 link = pirq_translate_link(dev, link);
87 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 /* Fix up the table checksum */
115 rt->checksum = table_compute_checksum(rt, rt->size);
117 /* Align the table to be 16 byte aligned */
118 addr = ALIGN(addr, 16);
120 debug("Copying Interrupt Routing Table to 0x%x\n", addr);
121 memcpy((void *)addr, rt, rt->size);
124 * We do the sanity check here against the copied table after memcpy,
125 * as something might go wrong after the memcpy, which is normally
126 * due to the F segment decode is not turned on to systeam RAM.
128 rom_rt = (struct irq_routing_table *)addr;
129 if (rom_rt->signature != PIRQ_SIGNATURE ||
130 rom_rt->version != PIRQ_VERSION || rom_rt->size % 16) {
131 printf("Interrupt Routing Table not valid\n");
135 return addr + rt->size;