blob: a93d355d8a2457e3e049db8b07d1986a6c98a56e [file] [log] [blame]
Bin Meng45236ad2015-04-24 18:10:05 +08001/*
2 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
3 *
4 * Part of this file is ported from coreboot src/arch/x86/boot/pirq_routing.c
5 *
6 * SPDX-License-Identifier: GPL-2.0+
7 */
8
9#include <common.h>
10#include <pci.h>
11#include <asm/pci.h>
12#include <asm/pirq_routing.h>
Bin Meng45236ad2015-04-24 18:10:05 +080013
14static bool irq_already_routed[16];
15
Bin Menga5a20032016-02-01 01:40:51 -080016static u8 pirq_get_next_free_irq(struct udevice *dev, u8 *pirq, u16 bitmap)
Bin Meng45236ad2015-04-24 18:10:05 +080017{
18 int i, link;
19 u8 irq = 0;
20
21 /* IRQ sharing starts from IRQ#3 */
22 for (i = 3; i < 16; i++) {
23 /* Can we assign this IRQ? */
24 if (!((bitmap >> i) & 1))
25 continue;
26
27 /* We can, now let's assume we can use this IRQ */
28 irq = i;
29
30 /* Have we already routed it? */
31 if (irq_already_routed[irq])
32 continue;
33
34 for (link = 0; link < CONFIG_MAX_PIRQ_LINKS; link++) {
Bin Menga5a20032016-02-01 01:40:51 -080035 if (pirq_check_irq_routed(dev, link, irq)) {
Bin Meng45236ad2015-04-24 18:10:05 +080036 irq_already_routed[irq] = true;
37 break;
38 }
39 }
40
41 /* If it's not yet routed, use it */
42 if (!irq_already_routed[irq]) {
43 irq_already_routed[irq] = true;
44 break;
45 }
46
47 /* But if it was already routed, try the next one */
48 }
49
50 /* Now we get our IRQ */
51 return irq;
52}
53
Bin Menga5a20032016-02-01 01:40:51 -080054void pirq_route_irqs(struct udevice *dev, struct irq_info *irq, int num)
Bin Meng45236ad2015-04-24 18:10:05 +080055{
56 unsigned char irq_slot[MAX_INTX_ENTRIES];
57 unsigned char pirq[CONFIG_MAX_PIRQ_LINKS];
58 int i, intx;
59
60 memset(pirq, 0, CONFIG_MAX_PIRQ_LINKS);
61
62 /* Set PCI IRQs */
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);
66
67 for (intx = 0; intx < MAX_INTX_ENTRIES; intx++) {
68 int link = irq->irq[intx].link;
69 int bitmap = irq->irq[intx].bitmap;
70 int irq = 0;
71
72 debug("INT%c link: %x bitmap: %x ",
73 'A' + intx, link, bitmap);
74
75 if (!bitmap || !link) {
76 debug("not routed\n");
77 irq_slot[intx] = irq;
78 continue;
79 }
80
81 /* translate link value to link number */
Bin Menga5a20032016-02-01 01:40:51 -080082 link = pirq_translate_link(dev, link);
Bin Meng45236ad2015-04-24 18:10:05 +080083
84 /* yet not routed */
85 if (!pirq[link]) {
Bin Menga5a20032016-02-01 01:40:51 -080086 irq = pirq_get_next_free_irq(dev, pirq, bitmap);
Bin Meng45236ad2015-04-24 18:10:05 +080087 pirq[link] = irq;
88 } else {
89 irq = pirq[link];
90 }
91
92 debug("IRQ: %d\n", irq);
93 irq_slot[intx] = irq;
94
95 /* Assign IRQ in the interrupt router */
Bin Menga5a20032016-02-01 01:40:51 -080096 pirq_assign_irq(dev, link, irq);
Bin Meng45236ad2015-04-24 18:10:05 +080097 }
98
99 /* Bus, device, slots IRQs for {A,B,C,D} */
Bin Mengda5d4632015-07-15 16:23:40 +0800100 pci_assign_irqs(irq->bus, irq->devfn >> 3, irq_slot);
Bin Meng45236ad2015-04-24 18:10:05 +0800101
102 irq++;
103 }
104
105 for (i = 0; i < CONFIG_MAX_PIRQ_LINKS; i++)
106 debug("PIRQ%c: %d\n", 'A' + i, pirq[i]);
107}
108
109u32 copy_pirq_routing_table(u32 addr, struct irq_routing_table *rt)
110{
Bin Meng7a01b872015-04-27 14:16:01 +0800111 struct irq_routing_table *rom_rt;
Bin Meng45236ad2015-04-24 18:10:05 +0800112
Bin Meng45236ad2015-04-24 18:10:05 +0800113 /* Align the table to be 16 byte aligned */
114 addr = ALIGN(addr, 16);
115
116 debug("Copying Interrupt Routing Table to 0x%x\n", addr);
117 memcpy((void *)addr, rt, rt->size);
118
Bin Meng7a01b872015-04-27 14:16:01 +0800119 /*
120 * We do the sanity check here against the copied table after memcpy,
121 * as something might go wrong after the memcpy, which is normally
122 * due to the F segment decode is not turned on to systeam RAM.
123 */
124 rom_rt = (struct irq_routing_table *)addr;
125 if (rom_rt->signature != PIRQ_SIGNATURE ||
126 rom_rt->version != PIRQ_VERSION || rom_rt->size % 16) {
127 printf("Interrupt Routing Table not valid\n");
128 return addr;
129 }
130
Bin Meng45236ad2015-04-24 18:10:05 +0800131 return addr + rt->size;
132}