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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 <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <assert.h>
#include "82870.h"
static int num_p64h2_ioapics = 0;
static void p64h2_ioapic_enable(struct device *dev)
{
/* We have to enable MEM and Bus Master for IOAPIC */
uint16_t command = PCI_COMMAND_SERR | PCI_COMMAND_PARITY | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
pci_write_config16(dev, PCI_COMMAND, command);
}
/**
* Configure one of the IOAPICs in a P64H2.
*
* Note that a PCI bus scan will detect both IOAPICs, so this function
* will be called twice for each P64H2 in the system.
*
* @param dev PCI bus/device/function of P64H2 IOAPIC.
* NOTE: There are two IOAPICs per P64H2, at D28:F0 and D30:F0.
*/
static void p64h2_ioapic_init(struct device *dev)
{
uint32_t memoryBase;
int apic_index, apic_id;
volatile uint32_t *pIndexRegister; /* io APIC io memory space command address */
volatile uint32_t *pWindowRegister; /* io APIC io memory space data address */
apic_index = num_p64h2_ioapics;
num_p64h2_ioapics++;
// A note on IOAPIC addresses:
// 0 and 1 are used for the local APICs of the dual virtual
// (hyper-threaded) CPUs of physical CPU 0 (devicetree.cb).
// 6 and 7 are used for the local APICs of the dual virtual
// (hyper-threaded) CPUs of physical CPU 1 (devicetree.cb).
// 2 is used for the IOAPIC in the 82801 southbridge (hard-coded in i82801xx_lpc.c)
// Map APIC index into APIC ID
// IDs 3, 4, 5, and 8+ are available (see above note)
if (apic_index < 3)
apic_id = apic_index + 3;
else
apic_id = apic_index + 5;
ASSERT(apic_id < 16); // ID is only 4 bits
// Read the MBAR address for setting up the IOAPIC in memory space
// NOTE: this address was assigned during enumeration of the bus
memoryBase = pci_read_config32(dev, PCI_BASE_ADDRESS_0);
pIndexRegister = (volatile uint32_t *) memoryBase;
pWindowRegister = (volatile uint32_t *)(memoryBase + 0x10);
printk(BIOS_DEBUG, "IOAPIC %d at %02x:%02x.%01x MBAR = %p DataAddr = %p\n",
apic_id, dev->bus->secondary, PCI_SLOT(dev->path.pci.devfn),
PCI_FUNC(dev->path.pci.devfn), pIndexRegister, pWindowRegister);
apic_id <<= 24; // Convert ID to bitmask
*pIndexRegister = 0; // Select APIC ID register
*pWindowRegister = (*pWindowRegister & ~(0x0f << 24)) | apic_id; // Set the ID
if ((*pWindowRegister & (0x0f << 24)) != apic_id)
die("p64h2_ioapic_init failed");
*pIndexRegister = 3; // Select Boot Configuration register
*pWindowRegister |= 1; // Use Processor System Bus to deliver interrupts
if (!(*pWindowRegister & 1))
die("p64h2_ioapic_init failed");
}
static struct device_operations ioapic_ops = {
.read_resources = pci_dev_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = p64h2_ioapic_init,
.enable = p64h2_ioapic_enable,
};
static const struct pci_driver ioapic_driver __pci_driver = {
.ops = &ioapic_ops,
.vendor = PCI_VENDOR_ID_INTEL,
.device = PCI_DEVICE_ID_INTEL_82870_1E0,
};
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