| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <console/console.h> |
| #include <arch/pirq_routing.h> |
| #include <commonlib/helpers.h> |
| #include <string.h> |
| #include <device/pci.h> |
| |
| static void check_pirq_routing_table(struct irq_routing_table *rt) |
| { |
| uint8_t *addr = (uint8_t *)rt; |
| uint8_t sum = 0; |
| int i; |
| |
| printk(BIOS_INFO, "Checking Interrupt Routing Table consistency...\n"); |
| |
| if (sizeof(struct irq_routing_table) != rt->size) { |
| printk(BIOS_WARNING, |
| "Inconsistent Interrupt Routing Table size (0x%x/0x%x).\n", |
| (unsigned int) sizeof(struct irq_routing_table), |
| rt->size); |
| rt->size = sizeof(struct irq_routing_table); |
| } |
| |
| for (i = 0; i < rt->size; i++) |
| sum += addr[i]; |
| |
| printk(BIOS_DEBUG, "%s(): Interrupt Routing Table located at %p.\n", |
| __func__, addr); |
| |
| |
| sum = rt->checksum - sum; |
| |
| if (sum != rt->checksum) { |
| printk(BIOS_WARNING, |
| "Interrupt Routing Table checksum is: 0x%02x but should be: 0x%02x.\n", |
| rt->checksum, sum); |
| rt->checksum = sum; |
| } |
| |
| if (rt->signature != PIRQ_SIGNATURE || rt->version != PIRQ_VERSION || |
| rt->size % 16) { |
| printk(BIOS_WARNING, "Interrupt Routing Table not valid.\n"); |
| return; |
| } |
| |
| sum = 0; |
| for (i = 0; i < rt->size; i++) |
| sum += addr[i]; |
| |
| /* We're manually fixing the checksum above. This warning can probably |
| * never happen because if the target location is read-only this |
| * function would have bailed out earlier. |
| */ |
| if (sum) { |
| printk(BIOS_WARNING, "Checksum error in Interrupt Routing Table " |
| "could not be fixed.\n"); |
| } |
| |
| printk(BIOS_INFO, "done.\n"); |
| } |
| |
| static int verify_copy_pirq_routing_table(unsigned long addr, |
| const struct irq_routing_table *routing_table) |
| { |
| int i; |
| uint8_t *rt_orig, *rt_curr; |
| |
| rt_curr = (uint8_t *)addr; |
| rt_orig = (uint8_t *)routing_table; |
| printk(BIOS_INFO, |
| "Verifying copy of Interrupt Routing Table at 0x%08lx... ", |
| addr); |
| for (i = 0; i < routing_table->size; i++) { |
| if (*(rt_curr + i) != *(rt_orig + i)) { |
| printk(BIOS_INFO, "failed\n"); |
| return -1; |
| } |
| } |
| printk(BIOS_INFO, "done\n"); |
| |
| check_pirq_routing_table((struct irq_routing_table *)addr); |
| |
| return 0; |
| } |
| |
| static u8 pirq_get_next_free_irq(u8 *pirq, u16 bitmap) |
| { |
| int i, link; |
| u8 irq = 0; |
| for (i = 2; i <= 15; i++) { |
| /* Can we assign this IRQ ? */ |
| if (!((bitmap >> i) & 1)) |
| continue; |
| /* We can, Now let's assume we can use this IRQ */ |
| irq = i; |
| /* And assume we have not yet routed it */ |
| int already_routed = 0; |
| /* Have we already routed it ? */ |
| for (link = 0; link < CONFIG_MAX_PIRQ_LINKS; link++) { |
| if (pirq[link] == irq) { |
| already_routed = 1; |
| break; |
| } |
| } |
| /* If it's not yet routed, use it */ |
| if (!already_routed) |
| break; |
| /* But if it was already routed, try the next one */ |
| continue; |
| } |
| /* Now we got our IRQ */ |
| return irq; |
| } |
| |
| static void pirq_route_irqs(unsigned long addr) |
| { |
| int i, intx, num_entries; |
| unsigned char irq_slot[MAX_INTX_ENTRIES]; |
| unsigned char pirq[CONFIG_MAX_PIRQ_LINKS]; |
| struct irq_routing_table *pirq_tbl; |
| |
| memset(pirq, 0, CONFIG_MAX_PIRQ_LINKS); |
| |
| pirq_tbl = (struct irq_routing_table *)(addr); |
| num_entries = (pirq_tbl->size - 32) / 16; |
| |
| /* Set PCI IRQs. */ |
| for (i = 0; i < num_entries; i++) { |
| |
| u8 bus = pirq_tbl->slots[i].bus; |
| u8 devfn = pirq_tbl->slots[i].devfn; |
| |
| printk(BIOS_DEBUG, "PIRQ Entry %d Dev/Fn: %X Slot: %d\n", i, |
| devfn >> 3, pirq_tbl->slots[i].slot); |
| |
| for (intx = 0; intx < MAX_INTX_ENTRIES; intx++) { |
| |
| int link = pirq_tbl->slots[i].irq[intx].link; |
| int bitmap = pirq_tbl->slots[i].irq[intx].bitmap; |
| int irq = 0; |
| |
| printk(BIOS_DEBUG, "INT: %c link: %x bitmap: %x ", |
| 'A' + intx, link, bitmap); |
| |
| if (!bitmap || !link || link > CONFIG_MAX_PIRQ_LINKS) { |
| |
| printk(BIOS_DEBUG, "not routed\n"); |
| irq_slot[intx] = irq; |
| continue; |
| } |
| |
| /* yet not routed */ |
| if (!pirq[link - 1]) { |
| irq = pirq_get_next_free_irq(pirq, bitmap); |
| if (irq) |
| pirq[link - 1] = irq; |
| } else |
| irq = pirq[link - 1]; |
| |
| printk(BIOS_DEBUG, "IRQ: %d\n", irq); |
| irq_slot[intx] = irq; |
| } |
| |
| /* Bus, device, slots IRQs for {A,B,C,D}. */ |
| pci_assign_irqs(pcidev_path_on_bus(bus, devfn), irq_slot); |
| } |
| |
| for (i = 0; i < CONFIG_MAX_PIRQ_LINKS; i++) |
| printk(BIOS_DEBUG, "PIRQ%c: %d\n", i + 'A', pirq[i]); |
| |
| pirq_assign_irqs(pirq); |
| } |
| |
| unsigned long copy_pirq_routing_table(unsigned long addr, |
| const struct irq_routing_table *routing_table) |
| { |
| /* Align the table to be 16 byte aligned. */ |
| addr = ALIGN_UP(addr, 16); |
| |
| /* This table must be between 0xf0000 & 0x100000 */ |
| printk(BIOS_INFO, "Copying Interrupt Routing Table to 0x%08lx... ", |
| addr); |
| memcpy((void *)addr, routing_table, routing_table->size); |
| printk(BIOS_INFO, "done.\n"); |
| if (CONFIG(DEBUG_PIRQ)) |
| verify_copy_pirq_routing_table(addr, routing_table); |
| if (CONFIG(PIRQ_ROUTE)) |
| pirq_route_irqs(addr); |
| |
| return addr + routing_table->size; |
| } |