/* SPDX-License-Identifier: GPL-2.0-only */

#include <acpi/acpi.h>
#include <device/pci_ops.h>
#include <console/console.h>
#include <device/device.h>
#include <device/mmio.h>
#include <device/pci.h>
#include <device/pci_ids.h>

#include <soc/iomap.h>
#include <soc/pmc.h>
#include <soc/pci_devs.h>
#include <soc/ramstage.h>
#include <cpu/x86/smm.h>

/* While we read BAR dynamically in case it changed, let's
 * initialize it with a same value
 */
static u16 acpi_base = ACPI_BASE_ADDRESS;
static u32 pwrm_base = DEFAULT_PWRM_BASE;

static void pch_power_options(struct device *dev) { /* TODO */ }

static void pch_set_acpi_mode(void)
{
	if (!acpi_is_wakeup_s3()) {
		apm_control(APM_CNT_ACPI_DISABLE);
	}
}

static void pmc_init(struct device *dev)
{
	printk(BIOS_DEBUG, "pch: %s\n", __func__);

	/* Get the base address */
	acpi_base = pci_read_config16(dev, PMC_ACPI_BASE) & MASK_PMC_ACPI_BASE;
	pwrm_base = pci_read_config32(dev, PMC_PWRM_BASE) & MASK_PMC_PWRM_BASE;

	/* Set the value for PCI command register. */
	pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER |
						     PCI_COMMAND_MEMORY |
						     PCI_COMMAND_IO);

	/* Setup power options. */
	pch_power_options(dev);

	/* Configure ACPI mode. */
	pch_set_acpi_mode();

	/*
	 * Disable ACPI PM timer based on Kconfig
	 *
	 * Disabling ACPI PM timer is necessary for XTAL OSC shutdown.
	 * Disabling ACPI PM timer also switches off TCO.
	 */
	if (!CONFIG(USE_PM_ACPI_TIMER))
		setbits8((volatile void *)(uintptr_t)(pwrm_base + PCH_PWRM_ACPI_TMR_CTL),
			 ACPI_TIM_DIS);
}

static void pci_pmc_read_resources(struct device *dev)
{
	struct resource *res;

	/* Get the normal PCI resources of this device. */
	pci_dev_read_resources(dev);

	/* Add MMIO resource
	 * Use 0xaa as an unused index for PWRM BAR.
	 */
	u32 reg32 = pci_read_config32(dev, PMC_PWRM_BASE) & MASK_PMC_PWRM_BASE;
	if ((reg32 != 0x0) && (reg32 != 0xffffffff)) {
		res = new_resource(dev, 0xaa);
		res->base = reg32;
		res->size = 64 * 1024; /* 64K bytes memory config space */
		res->flags =
			IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
		printk(BIOS_DEBUG,
		       "Adding PMC PWRM config space BAR 0x%08lx-0x%08lx.\n",
		       (unsigned long)(res->base),
		       (unsigned long)(res->base + res->size));
	}

	/* Add MMIO resource
	 * Use 0xab as an unused index for ACPI BAR.
	 */
	u16 reg16 = pci_read_config16(dev, PMC_ACPI_BASE) & MASK_PMC_ACPI_BASE;
	if ((reg16 != 0x0) && (reg16 != 0xffff)) {
		res = new_resource(dev, 0xab);
		res->base = reg16;
		res->size = 0x100; /* 256 bytes I/O config space */
		res->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE |
			     IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
	}
}

static struct device_operations pmc_ops = {
	.read_resources = pci_pmc_read_resources,
	.set_resources = pci_dev_set_resources,
	.enable_resources = pci_dev_enable_resources,
	.init = pmc_init,
	.ops_pci = &soc_pci_ops,
};

static const struct pci_driver pch_pmc __pci_driver = {
	.ops = &pmc_ops,
	.vendor = PCI_VENDOR_ID_INTEL,
	.device = PCI_DEVICE_ID_INTEL_DENVERTON_PMC,
};
