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