irq_tables.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <device/pci_def.h>
#include <string.h>
#include <stdint.h>
#include <arch/pirq_routing.h>
 
static void write_pirq_info(struct irq_info *pirq_info, u8 bus, u8 devfn,
                            u8 link0, u16 bitmap0, u8 link1, u16 bitmap1,
                            u8 link2, u16 bitmap2, u8 link3, u16 bitmap3,
                            u8 slot, u8 rfu)
{
        pirq_info->bus = bus;
        pirq_info->devfn = devfn;
        pirq_info->irq[0].link = link0;
        pirq_info->irq[0].bitmap = bitmap0;
        pirq_info->irq[1].link = link1;
        pirq_info->irq[1].bitmap = bitmap1;
        pirq_info->irq[2].link = link2;
        pirq_info->irq[2].bitmap = bitmap2;
        pirq_info->irq[3].link = link3;
        pirq_info->irq[3].bitmap = bitmap3;
        pirq_info->slot = slot;
        pirq_info->rfu = rfu;
}
 
unsigned long write_pirq_routing_table(unsigned long addr)
{
        struct irq_routing_table *pirq;
        struct irq_info *pirq_info;
        u32 slot_num;
        u8 *v;
 
        u8 sum = 0;
        int i;
 
        /* Align the table to be 16 byte aligned. */
        addr += 15;
        addr &= ~15;
 
        /* This table must be between 0xf0000 & 0x100000 */
        printk(BIOS_INFO, "Writing IRQ routing tables to 0x%lx...", addr);
 
        pirq = (void *)(addr);
        v = (u8 *) (addr);
 
        pirq->signature = PIRQ_SIGNATURE;
        pirq->version = PIRQ_VERSION;
 
        pirq->rtr_bus = 0;
        pirq->rtr_devfn = PCI_DEVFN(0x14, 4);
 
        pirq->exclusive_irqs = 0;
 
        pirq->rtr_vendor = 0x1002;
        pirq->rtr_device = 0x4384;
 
        pirq->miniport_data = 0;
 
        memset(pirq->rfu, 0, sizeof(pirq->rfu));
 
        pirq_info = (void *)(&pirq->checksum + 1);
        slot_num = 0;
 
        /* pci bridge */
        write_pirq_info(pirq_info, 0, PCI_DEVFN(0x14, 4),
                        0x1, 0xdef8, 0x2, 0xdef8, 0x3, 0xdef8, 0x4, 0xdef8, 0,
                        0);
        pirq_info++;
 
        slot_num++;
 
        pirq->size = 32 + 16 * slot_num;
 
        for (i = 0; i < pirq->size; i++)
                sum += v[i];
 
        sum = pirq->checksum - sum;
 
        if (sum != pirq->checksum) {
                pirq->checksum = sum;
        }
 
        printk(BIOS_INFO, "%s done.\n", __func__);
 
        return (unsigned long)pirq_info;
}