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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <console/console.h>
#include <device/device.h>
#include "chip.h"
#include <arch/ioapic.h>
#include <cpu/x86/lapic.h>
static void ioapic_init(struct device *dev)
{
struct drivers_generic_ioapic_config *config = dev->chip_info;
u32 bsp_lapicid = lapicid();
u32 low, high;
u32 i, ioapic_interrupts;
void *ioapic_base;
u8 ioapic_id;
if (!dev->enabled || !config)
return;
ioapic_base = config->base;
ioapic_id = config->apicid;
printk(BIOS_DEBUG, "IOAPIC: Initializing IOAPIC at %p\n",
ioapic_base);
printk(BIOS_DEBUG, "IOAPIC: Bootstrap Processor Local APIC = 0x%02x\n",
bsp_lapicid);
if (ioapic_id) {
printk(BIOS_DEBUG, "IOAPIC: ID = 0x%02x\n", ioapic_id);
/* Set IOAPIC ID if it has been specified. */
io_apic_write(ioapic_base, 0x00,
(io_apic_read(ioapic_base, 0x00) & 0xf0ffffff) |
(ioapic_id << 24));
}
/* Read the available number of interrupts. */
ioapic_interrupts = (io_apic_read(ioapic_base, 0x01) >> 16) & 0xff;
if (!ioapic_interrupts || ioapic_interrupts == 0xff)
ioapic_interrupts = 24;
printk(BIOS_DEBUG, "IOAPIC: %d interrupts\n", ioapic_interrupts);
if (config->irq_on_fsb) {
/*
* For the Pentium 4 and above APICs deliver their interrupts
* on the front side bus, enable that.
*/
printk(BIOS_DEBUG, "IOAPIC: Enabling interrupts on FSB\n");
io_apic_write(ioapic_base, 0x03,
io_apic_read(ioapic_base, 0x03) | (1 << 0));
} else {
printk(BIOS_DEBUG, "IOAPIC: Enabling interrupts on APIC serial bus\n");
io_apic_write(ioapic_base, 0x03, 0);
}
if (config->enable_virtual_wire) {
/* Enable Virtual Wire Mode. */
low = INT_ENABLED | TRIGGER_EDGE | POLARITY_HIGH | PHYSICAL_DEST | ExtINT;
high = bsp_lapicid << (56 - 32);
io_apic_write(ioapic_base, 0x10, low);
io_apic_write(ioapic_base, 0x11, high);
if (io_apic_read(ioapic_base, 0x10) == 0xffffffff) {
printk(BIOS_WARNING, "IOAPIC not responding.\n");
return;
}
printk(BIOS_SPEW, "IOAPIC: reg 0x%08x value 0x%08x 0x%08x\n", 0,
high, low);
}
low = INT_DISABLED;
high = NONE;
for (i = 1; i < ioapic_interrupts; i++) {
io_apic_write(ioapic_base, i * 2 + 0x10, low);
io_apic_write(ioapic_base, i * 2 + 0x11, high);
printk(BIOS_SPEW, "IOAPIC: reg 0x%08x value 0x%08x 0x%08x\n",
i, high, low);
}
}
static void ioapic_read_resources(struct device *dev)
{
struct drivers_generic_ioapic_config *config = (struct drivers_generic_ioapic_config *)dev->chip_info;
struct resource *res;
res = new_resource(dev, 0);
res->base = (resource_t)(uintptr_t)config->base;
res->size = 0x1000;
res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
}
static struct device_operations ioapic_operations = {
.read_resources = ioapic_read_resources,
.set_resources = noop_set_resources,
.init = ioapic_init,
};
static void enable_dev(struct device *dev)
{
dev->ops = &ioapic_operations;
}
struct chip_operations drivers_generic_ioapic_ops = {
CHIP_NAME("IOAPIC")
.enable_dev = enable_dev,
};
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