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/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*
* Part of this file is ported from coreboot src/arch/x86/boot/pirq_routing.c
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <pci.h>
#include <asm/pci.h>
#include <asm/pirq_routing.h>
#include <asm/tables.h>
static bool irq_already_routed[16];
static u8 pirq_get_next_free_irq(u8 *pirq, u16 bitmap)
{
int i, link;
u8 irq = 0;
/* IRQ sharing starts from IRQ#3 */
for (i = 3; i < 16; i++) {
/* Can we assign this IRQ? */
if (!((bitmap >> i) & 1))
continue;
/* We can, now let's assume we can use this IRQ */
irq = i;
/* Have we already routed it? */
if (irq_already_routed[irq])
continue;
for (link = 0; link < CONFIG_MAX_PIRQ_LINKS; link++) {
if (pirq_check_irq_routed(link, irq)) {
irq_already_routed[irq] = true;
break;
}
}
/* If it's not yet routed, use it */
if (!irq_already_routed[irq]) {
irq_already_routed[irq] = true;
break;
}
/* But if it was already routed, try the next one */
}
/* Now we get our IRQ */
return irq;
}
void pirq_route_irqs(struct irq_info *irq, int num)
{
unsigned char irq_slot[MAX_INTX_ENTRIES];
unsigned char pirq[CONFIG_MAX_PIRQ_LINKS];
int i, intx;
memset(pirq, 0, CONFIG_MAX_PIRQ_LINKS);
/* Set PCI IRQs */
for (i = 0; i < num; i++) {
debug("PIRQ Entry %d Dev: %d.%x.%d\n", i,
irq->bus, irq->devfn >> 3, irq->devfn & 7);
for (intx = 0; intx < MAX_INTX_ENTRIES; intx++) {
int link = irq->irq[intx].link;
int bitmap = irq->irq[intx].bitmap;
int irq = 0;
debug("INT%c link: %x bitmap: %x ",
'A' + intx, link, bitmap);
if (!bitmap || !link) {
debug("not routed\n");
irq_slot[intx] = irq;
continue;
}
/* translate link value to link number */
link = pirq_translate_link(link);
/* yet not routed */
if (!pirq[link]) {
irq = pirq_get_next_free_irq(pirq, bitmap);
pirq[link] = irq;
} else {
irq = pirq[link];
}
debug("IRQ: %d\n", irq);
irq_slot[intx] = irq;
/* Assign IRQ in the interrupt router */
pirq_assign_irq(link, irq);
}
/* Bus, device, slots IRQs for {A,B,C,D} */
pci_assign_irqs(irq->bus, irq->devfn >> 3, irq_slot);
irq++;
}
for (i = 0; i < CONFIG_MAX_PIRQ_LINKS; i++)
debug("PIRQ%c: %d\n", 'A' + i, pirq[i]);
}
u32 copy_pirq_routing_table(u32 addr, struct irq_routing_table *rt)
{
struct irq_routing_table *rom_rt;
/* Fix up the table checksum */
rt->checksum = table_compute_checksum(rt, rt->size);
/* Align the table to be 16 byte aligned */
addr = ALIGN(addr, 16);
debug("Copying Interrupt Routing Table to 0x%x\n", addr);
memcpy((void *)addr, rt, rt->size);
/*
* We do the sanity check here against the copied table after memcpy,
* as something might go wrong after the memcpy, which is normally
* due to the F segment decode is not turned on to systeam RAM.
*/
rom_rt = (struct irq_routing_table *)addr;
if (rom_rt->signature != PIRQ_SIGNATURE ||
rom_rt->version != PIRQ_VERSION || rom_rt->size % 16) {
printf("Interrupt Routing Table not valid\n");
return addr;
}
return addr + rt->size;
}
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