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

#include <stdbool.h>

#include <console/console.h>
#include <device/device.h>
#include <device/resource.h>

#include <defs_iio.h>
#include <hob_iiouds.h>
#include <IioPcieConfigUpd.h>

#include <soc/chip_common.h>

/*
 * Used for IIO stacks for accelerators and other functionality (IOAT).
 * Those have only integrated PCI endpoints (no bridges) behind the host bridge.
 */

static struct device_operations ioat_domain_ops = {
	.read_resources = noop_read_resources,
	.set_resources = pci_domain_set_resources,
	.scan_bus = pci_host_bridge_scan_bus,
};

static void create_ioat_domain(const union xeon_domain_path dp, struct bus *const upstream,
				const unsigned int bus_base, const unsigned int bus_limit,
				const resource_t mem32_base, const resource_t mem32_limit,
				const resource_t mem64_base, const resource_t mem64_limit)
{
	union xeon_domain_path new_path = {
		.domain_path = dp.domain_path
	};
	new_path.bus = bus_base;

	struct device_path path = {
		.type = DEVICE_PATH_DOMAIN,
		.domain = {
			.domain = new_path.domain_path,
		},
	};
	struct device *const domain = alloc_dev(upstream, &path);
	if (!domain)
		die("%s: out of memory.\n", __func__);

	domain->ops = &ioat_domain_ops;

	struct bus *const bus = alloc_bus(domain);
	bus->secondary = bus_base;
	bus->subordinate = bus->secondary;
	bus->max_subordinate = bus_limit;

	unsigned int index = 0;

	if (mem32_base <= mem32_limit) {
		struct resource *const res = new_resource(domain, index++);
		res->base = mem32_base;
		res->limit = mem32_limit;
		res->size = res->limit - res->base + 1;
		res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED;
	}

	if (mem64_base <= mem64_limit) {
		struct resource *const res = new_resource(domain, index++);
		res->base = mem64_base;
		res->limit = mem64_limit;
		res->size = res->limit - res->base + 1;
		res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED;
	}
}

void soc_create_ioat_domains(const union xeon_domain_path path, struct bus *const bus, const STACK_RES *const sr)
{
	if (sr->BusLimit < sr->BusBase + HQM_BUS_OFFSET + HQM_RESERVED_BUS) {
		printk(BIOS_WARNING,
			"Ignoring IOAT domain with limited bus range.\n");
		return;
	}

	if (sr->PciResourceMem64Limit - sr->PciResourceMem64Base + 1
	    < 2 * CPM_MMIO_SIZE + 2 * HQM_MMIO_SIZE) {
		printk(BIOS_WARNING,
		       "Ignoring IOAT domain with limited 64-bit MMIO window.\n");
		return;
	}

	/* The FSP HOB doesn't provide accurate information about the
	   resource allocation. Hence use pre-defined offsets. Based
	   on ACPI code in create_dsdt_dino_resource(), soc_acpi.c: */
	resource_t mem64_base, mem64_limit, bus_base, bus_limit;

	/* CPM0 */
	mem64_base = sr->PciResourceMem64Base;
	mem64_limit = mem64_base + CPM_MMIO_SIZE - 1;
	bus_base = sr->BusBase + CPM_BUS_OFFSET;
	bus_limit = bus_base + CPM_RESERVED_BUS;
	create_ioat_domain(path, bus, bus_base, bus_limit, 0, -1, mem64_base, mem64_limit);

	/* HQM0 */
	mem64_base = mem64_limit + 1;
	mem64_limit = mem64_base + HQM_MMIO_SIZE - 1;
	bus_base = sr->BusBase + HQM_BUS_OFFSET;
	bus_limit = bus_base + HQM_RESERVED_BUS;
	create_ioat_domain(path, bus, bus_base, bus_limit, 0, -1, mem64_base, mem64_limit);

	/* CPM1 (optional) */
	mem64_base = mem64_limit + 1;
	mem64_limit = mem64_base + CPM_MMIO_SIZE - 1;
	bus_base = sr->BusBase + CPM1_BUS_OFFSET;
	bus_limit = bus_base + CPM_RESERVED_BUS;
	if (bus_limit <= sr->BusLimit)
		create_ioat_domain(path, bus, bus_base, bus_limit, 0, -1, mem64_base, mem64_limit);

	/* HQM1 (optional) */
	mem64_base = mem64_limit + 1;
	mem64_limit = mem64_base + HQM_MMIO_SIZE - 1;
	bus_base = sr->BusBase + HQM1_BUS_OFFSET;
	bus_limit = bus_base + HQM_RESERVED_BUS;
	if (bus_limit <= sr->BusLimit)
		create_ioat_domain(path, bus, bus_base, bus_limit, 0, -1, mem64_base, mem64_limit);

	/* DINO */
	mem64_base = mem64_limit + 1;
	mem64_limit = sr->PciResourceMem64Limit;
	bus_base = sr->BusBase;
	bus_limit = bus_base;
	create_ioat_domain(path, bus, bus_base, bus_limit, sr->PciResourceMem32Base, sr->PciResourceMem32Limit,
		mem64_base, mem64_limit);
}