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 <pci.h> 10 #include <asm/pci.h> 11 #include <asm/pirq_routing.h> 12 13 static u8 pirq_get_next_free_irq(struct udevice *dev, u8 *pirq, u16 bitmap, 14 bool irq_already_routed[]) 15 { 16 int i, link; 17 u8 irq = 0; 18 19 /* IRQ sharing starts from IRQ#3 */ 20 for (i = 3; i < 16; i++) { 21 /* Can we assign this IRQ? */ 22 if (!((bitmap >> i) & 1)) 23 continue; 24 25 /* We can, now let's assume we can use this IRQ */ 26 irq = i; 27 28 /* Have we already routed it? */ 29 if (irq_already_routed[irq]) 30 continue; 31 32 for (link = 0; link < CONFIG_MAX_PIRQ_LINKS; link++) { 33 if (pirq_check_irq_routed(dev, link, irq)) { 34 irq_already_routed[irq] = true; 35 break; 36 } 37 } 38 39 /* If it's not yet routed, use it */ 40 if (!irq_already_routed[irq]) { 41 irq_already_routed[irq] = true; 42 break; 43 } 44 45 /* But if it was already routed, try the next one */ 46 } 47 48 /* Now we get our IRQ */ 49 return irq; 50 } 51 52 void pirq_route_irqs(struct udevice *dev, struct irq_info *irq, int num) 53 { 54 unsigned char irq_slot[MAX_INTX_ENTRIES]; 55 unsigned char pirq[CONFIG_MAX_PIRQ_LINKS]; 56 bool irq_already_routed[16]; 57 int i, intx; 58 59 memset(pirq, 0, CONFIG_MAX_PIRQ_LINKS); 60 memset(irq_already_routed, '\0', sizeof(irq_already_routed)); 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 irq_already_routed); 88 pirq[link] = irq; 89 } else { 90 irq = pirq[link]; 91 } 92 93 debug("IRQ: %d\n", irq); 94 irq_slot[intx] = irq; 95 96 /* Assign IRQ in the interrupt router */ 97 pirq_assign_irq(dev, link, irq); 98 } 99 100 /* Bus, device, slots IRQs for {A,B,C,D} */ 101 pci_assign_irqs(irq->bus, irq->devfn >> 3, irq_slot); 102 103 irq++; 104 } 105 106 for (i = 0; i < CONFIG_MAX_PIRQ_LINKS; i++) 107 debug("PIRQ%c: %d\n", 'A' + i, pirq[i]); 108 } 109 110 u32 copy_pirq_routing_table(u32 addr, struct irq_routing_table *rt) 111 { 112 struct irq_routing_table *rom_rt; 113 114 /* Align the table to be 16 byte aligned */ 115 addr = ALIGN(addr, 16); 116 117 debug("Copying Interrupt Routing Table to 0x%x\n", addr); 118 memcpy((void *)(uintptr_t)addr, rt, rt->size); 119 120 /* 121 * We do the sanity check here against the copied table after memcpy, 122 * as something might go wrong after the memcpy, which is normally 123 * due to the F segment decode is not turned on to systeam RAM. 124 */ 125 rom_rt = (struct irq_routing_table *)(uintptr_t)addr; 126 if (rom_rt->signature != PIRQ_SIGNATURE || 127 rom_rt->version != PIRQ_VERSION || rom_rt->size % 16) { 128 printf("Interrupt Routing Table not valid\n"); 129 return addr; 130 } 131 132 return addr + rt->size; 133 } 134