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