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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 <console/console.h>
#include <cpu/x86/smm.h>
#include <soc/iomap.h>
#include <soc/gpio.h>
#include <soc/pci_devs.h>
#include <soc/pm.h>
#include <timer.h>
#include "chip.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_0);
res->base = PMC_BAR0;
res->size = PMC_BAR0_SIZE;
res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
res = new_resource(dev, PCI_BASE_ADDRESS_4);
res->base = ACPI_BASE_ADDRESS;
res->size = ACPI_BASE_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_0);
pci_write_config32(dev, res->index, res->base);
dev->command |= PCI_COMMAND_MEMORY;
res->flags |= IORESOURCE_STORED;
report_resource_stored(dev, res, " PMC BAR");
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 void pch_set_acpi_mode(void)
{
if (IS_ENABLED(CONFIG_HAVE_SMI_HANDLER) && !acpi_is_wakeup_s3()) {
printk(BIOS_DEBUG, "Disabling ACPI via APMC:");
outb(APM_CNT_ACPI_DISABLE, APM_CNT);
printk(BIOS_DEBUG, "Done.\n");
}
}
static int choose_slp_s3_assertion_width(int width_usecs)
{
int i;
static const struct {
int max_width;
int value;
} slp_s3_settings[] = {
{
.max_width = 60,
.value = SLP_S3_ASSERT_60_USEC,
},
{
.max_width = 1 * USECS_PER_MSEC,
.value = SLP_S3_ASSERT_1_MSEC,
},
{
.max_width = 50 * USECS_PER_MSEC,
.value = SLP_S3_ASSERT_50_MSEC,
},
{
.max_width = 2 * USECS_PER_SEC,
.value = SLP_S3_ASSERT_2_SEC,
},
};
for (i = 0; i < ARRAY_SIZE(slp_s3_settings); i++) {
if (width_usecs <= slp_s3_settings[i].max_width)
break;
}
/* Provide conservative default if nothing set in devicetree
* or requested assertion width too large. */
if (width_usecs <= 0 || i == ARRAY_SIZE(slp_s3_settings))
i = ARRAY_SIZE(slp_s3_settings) - 1;
printk(BIOS_DEBUG, "SLP S3 assertion width: %d usecs\n",
slp_s3_settings[i].max_width);
return slp_s3_settings[i].value;
}
static void set_slp_s3_assertion_width(int width_usecs)
{
uint32_t reg;
uintptr_t gen_pmcon3 = get_pmc_mmio_bar() + GEN_PMCON3;
int setting = choose_slp_s3_assertion_width(width_usecs);
reg = read32((void *)gen_pmcon3);
reg &= ~SLP_S3_ASSERT_MASK;
reg |= setting << SLP_S3_ASSERT_WIDTH_SHIFT;
write32((void *)gen_pmcon3, reg);
}
static void pmc_init(struct device *dev)
{
const struct soc_intel_apollolake_config *cfg = dev->chip_info;
/* Set up GPE configuration */
pmc_gpe_init();
fixup_power_state();
pch_set_acpi_mode();
if (cfg != NULL)
set_slp_s3_assertion_width(cfg->slp_s3_assertion_width_usecs);
/* Log power state */
pch_log_state();
/* Now that things have been logged clear out the PMC state. */
clear_pmc_status();
}
static const struct device_operations device_ops = {
.read_resources = read_resources,
.set_resources = set_resources,
.enable_resources = pci_dev_enable_resources,
.init = &pmc_init,
};
static const unsigned short pci_device_ids[] = {
PCI_DEVICE_ID_INTEL_APL_PMC,
PCI_DEVICE_ID_INTEL_GLK_PMC,
0,
};
static const struct pci_driver pmc __pci_driver = {
.ops = &device_ops,
.vendor = PCI_VENDOR_ID_INTEL,
.devices= pci_device_ids,
};
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