// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com> * * Part of this file is ported from coreboot src/arch/x86/boot/pirq_routing.c */ #include <common.h> #include <log.h> #include <pci.h> #include <asm/global_data.h> #include <asm/pci.h> #include <asm/pirq_routing.h> DECLARE_GLOBAL_DATA_PTR; static u8 pirq_get_next_free_irq(struct udevice *dev, u8 *pirq, u16 bitmap, bool irq_already_routed[]) { 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(dev, 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 udevice *dev, struct irq_info *irq, int num) { unsigned char irq_slot[MAX_INTX_ENTRIES]; unsigned char pirq[CONFIG_MAX_PIRQ_LINKS]; bool irq_already_routed[16]; int i, intx; memset(pirq, 0, CONFIG_MAX_PIRQ_LINKS); memset(irq_already_routed, '\0', sizeof(irq_already_routed)); /* 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(dev, link); /* yet not routed */ if (!pirq[link]) { irq = pirq_get_next_free_irq(dev, pirq, bitmap, irq_already_routed); 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(dev, 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; /* Align the table to be 16 byte aligned */ addr = ALIGN(addr, 16); debug("Copying Interrupt Routing Table to 0x%x\n", addr); memcpy((void *)(uintptr_t)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 *)(uintptr_t)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; } ulong write_pirq_routing_table(ulong addr) { if (!gd->arch.pirq_routing_table) return addr; return copy_pirq_routing_table(addr, gd->arch.pirq_routing_table); }