1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com> 4 * 5 * Part of this file is ported from coreboot src/arch/x86/boot/pirq_routing.c 6 */ 7 8#include <common.h> 9#include <log.h> 10#include <pci.h> 11#include <asm/global_data.h> 12#include <asm/pci.h> 13#include <asm/pirq_routing.h> 14 15DECLARE_GLOBAL_DATA_PTR; 16 17static u8 pirq_get_next_free_irq(struct udevice *dev, u8 *pirq, u16 bitmap, 18 bool irq_already_routed[]) 19{ 20 int i, link; 21 u8 irq = 0; 22 23 /* IRQ sharing starts from IRQ#3 */ 24 for (i = 3; i < 16; i++) { 25 /* Can we assign this IRQ? */ 26 if (!((bitmap >> i) & 1)) 27 continue; 28 29 /* We can, now let's assume we can use this IRQ */ 30 irq = i; 31 32 /* Have we already routed it? */ 33 if (irq_already_routed[irq]) 34 continue; 35 36 for (link = 0; link < CONFIG_MAX_PIRQ_LINKS; link++) { 37 if (pirq_check_irq_routed(dev, link, irq)) { 38 irq_already_routed[irq] = true; 39 break; 40 } 41 } 42 43 /* If it's not yet routed, use it */ 44 if (!irq_already_routed[irq]) { 45 irq_already_routed[irq] = true; 46 break; 47 } 48 49 /* But if it was already routed, try the next one */ 50 } 51 52 /* Now we get our IRQ */ 53 return irq; 54} 55 56void pirq_route_irqs(struct udevice *dev, struct irq_info *irq, int num) 57{ 58 unsigned char irq_slot[MAX_INTX_ENTRIES]; 59 unsigned char pirq[CONFIG_MAX_PIRQ_LINKS]; 60 bool irq_already_routed[16]; 61 int i, intx; 62 63 memset(pirq, 0, CONFIG_MAX_PIRQ_LINKS); 64 memset(irq_already_routed, '\0', sizeof(irq_already_routed)); 65 66 /* Set PCI IRQs */ 67 for (i = 0; i < num; i++) { 68 debug("PIRQ Entry %d Dev: %d.%x.%d\n", i, 69 irq->bus, irq->devfn >> 3, irq->devfn & 7); 70 71 for (intx = 0; intx < MAX_INTX_ENTRIES; intx++) { 72 int link = irq->irq[intx].link; 73 int bitmap = irq->irq[intx].bitmap; 74 int irq = 0; 75 76 debug("INT%c link: %x bitmap: %x ", 77 'A' + intx, link, bitmap); 78 79 if (!bitmap || !link) { 80 debug("not routed\n"); 81 irq_slot[intx] = irq; 82 continue; 83 } 84 85 /* translate link value to link number */ 86 link = pirq_translate_link(dev, link); 87 88 /* yet not routed */ 89 if (!pirq[link]) { 90 irq = pirq_get_next_free_irq(dev, pirq, bitmap, 91 irq_already_routed); 92 pirq[link] = irq; 93 } else { 94 irq = pirq[link]; 95 } 96 97 debug("IRQ: %d\n", irq); 98 irq_slot[intx] = irq; 99 100 /* Assign IRQ in the interrupt router */ 101 pirq_assign_irq(dev, link, irq); 102 } 103 104 /* Bus, device, slots IRQs for {A,B,C,D} */ 105 pci_assign_irqs(irq->bus, irq->devfn >> 3, irq_slot); 106 107 irq++; 108 } 109 110 for (i = 0; i < CONFIG_MAX_PIRQ_LINKS; i++) 111 debug("PIRQ%c: %d\n", 'A' + i, pirq[i]); 112} 113 114u32 copy_pirq_routing_table(u32 addr, struct irq_routing_table *rt) 115{ 116 struct irq_routing_table *rom_rt; 117 118 /* Align the table to be 16 byte aligned */ 119 addr = ALIGN(addr, 16); 120 121 debug("Copying Interrupt Routing Table to 0x%x\n", addr); 122 memcpy((void *)(uintptr_t)addr, rt, rt->size); 123 124 /* 125 * We do the sanity check here against the copied table after memcpy, 126 * as something might go wrong after the memcpy, which is normally 127 * due to the F segment decode is not turned on to systeam RAM. 128 */ 129 rom_rt = (struct irq_routing_table *)(uintptr_t)addr; 130 if (rom_rt->signature != PIRQ_SIGNATURE || 131 rom_rt->version != PIRQ_VERSION || rom_rt->size % 16) { 132 printf("Interrupt Routing Table not valid\n"); 133 return addr; 134 } 135 136 return addr + rt->size; 137} 138 139ulong write_pirq_routing_table(ulong addr) 140{ 141 if (!gd->arch.pirq_routing_table) 142 return addr; 143 144 return copy_pirq_routing_table(addr, gd->arch.pirq_routing_table); 145} 146