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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2016 Intel Corp.
* (Written by Alexandru Gagniuc <alexandrux.gagniuc@intel.com> for Intel Corp.)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <soc/iomap.h>
#include <soc/pci_ids.h>
/*
* The ACPI IO BAR (offset 0x20) is not PCI compliant. We've observed cases
* where the BAR reads back as 0, but the IO window is open. This also means
* that it will not respond to PCI probing. In the event that probing the BAR
* fails, we still need to create a resource for it.
*/
static void read_resources(device_t dev)
{
struct resource *res;
pci_dev_read_resources(dev);
res = new_resource(dev, PCI_BASE_ADDRESS_4);
res->base = ACPI_PMIO_BASE;
res->size = ACPI_PMIO_SIZE;
res->flags = IORESOURCE_IO | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
}
/*
* Part 2:
* Resources are assigned, and no other device was given an IO resource to
* overlap with our ACPI BAR. But because the resource is FIXED,
* pci_dev_set_resources() will not store it for us. We need to do that
* explicitly.
*/
static void set_resources(device_t dev)
{
struct resource *res;
pci_dev_set_resources(dev);
res = find_resource(dev, PCI_BASE_ADDRESS_4);
pci_write_config32(dev, res->index, res->base);
dev->command |= PCI_COMMAND_IO;
res->flags |= IORESOURCE_STORED;
report_resource_stored(dev, res, " ACPI BAR");
}
static const struct device_operations device_ops = {
.read_resources = read_resources,
.set_resources = set_resources,
.enable_resources = pci_dev_enable_resources,
};
static const struct pci_driver pmc __pci_driver = {
.ops = &device_ops,
.vendor = PCI_VENDOR_ID_INTEL,
.device = PCI_DEVICE_ID_APOLLOLAKE_PMC,
};
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