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[u-boot] / arch / x86 / lib / pirq_routing.c
1 /*
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>
13
14 static bool irq_already_routed[16];
15
16 static u8 pirq_get_next_free_irq(struct udevice *dev, u8 *pirq, u16 bitmap)
17 {
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++) {
35                         if (pirq_check_irq_routed(dev, link, irq)) {
36                                 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
54 void pirq_route_irqs(struct udevice *dev, struct irq_info *irq, int num)
55 {
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 */
82                         link = pirq_translate_link(dev, link);
83
84                         /* yet not routed */
85                         if (!pirq[link]) {
86                                 irq = pirq_get_next_free_irq(dev, pirq, bitmap);
87                                 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 */
96                         pirq_assign_irq(dev, link, irq);
97                 }
98
99                 /* Bus, device, slots IRQs for {A,B,C,D} */
100                 pci_assign_irqs(irq->bus, irq->devfn >> 3, irq_slot);
101
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
109 u32 copy_pirq_routing_table(u32 addr, struct irq_routing_table *rt)
110 {
111         struct irq_routing_table *rom_rt;
112
113         /* 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
119         /*
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
131         return addr + rt->size;
132 }