PCI: mediatek: Use devm_of_pci_get_host_bridge_resources() to parse DT

 * @dev: pointer to PCIe device

 * @base: IO mapped register base

 * @free_ck: free-run reference clock

 * @io: IO resource

 * @pio: PIO resource

 * @mem: non-prefetchable memory resource

 * @busn: bus range

 * @offset: IO / Memory offset

 * @ports: pointer to PCIe port information

 * @soc: pointer to SoC-dependent operations

 * @busnr: root bus number

 */

struct mtk_pcie {

	struct device *dev;

	void __iomem *base;

	struct clk *free_ck;

	struct resource io;

	struct resource pio;

	struct resource mem;

	struct resource busn;

	struct {

		resource_size_t mem;

		resource_size_t io;

	} offset;

	struct list_head ports;

	const struct mtk_pcie_soc *soc;

	unsigned int busnr;

};

static void mtk_pcie_subsys_powerdown(struct mtk_pcie *pcie)

{

	struct device *dev = pcie->dev;

	struct device_node *node = dev->of_node, *child;

	struct of_pci_range_parser parser;

	struct of_pci_range range;

	struct resource res;

	struct mtk_pcie_port *port, *tmp;

	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);

	struct list_head *windows = &host->windows;

	struct resource_entry *win, *tmp_win;

	resource_size_t io_base;

	int err;

	if (of_pci_range_parser_init(&parser, node)) {

		dev_err(dev, "missing \"ranges\" property\n");

		return -EINVAL;

	}

	err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff,

						    windows, &io_base);

	if (err)

		return err;

	for_each_of_pci_range(&parser, &range) {

		err = of_pci_range_to_resource(&range, node, &res);

	err = devm_request_pci_bus_resources(dev, windows);

	if (err < 0)

		return err;

		switch (res.flags & IORESOURCE_TYPE_BITS) {

	/* Get the I/O and memory ranges from DT */

	resource_list_for_each_entry_safe(win, tmp_win, windows) {

		switch (resource_type(win->res)) {

		case IORESOURCE_IO:

			pcie->offset.io = res.start - range.pci_addr;

			memcpy(&pcie->pio, &res, sizeof(res));

			pcie->pio.name = node->full_name;

			pcie->io.start = range.cpu_addr;

			pcie->io.end = range.cpu_addr + range.size - 1;

			pcie->io.flags = IORESOURCE_MEM;

			pcie->io.name = "I/O";

			memcpy(&res, &pcie->io, sizeof(res));

			err = devm_pci_remap_iospace(dev, win->res, io_base);

			if (err) {

				dev_warn(dev, "error %d: failed to map resource %pR\n",

					 err, win->res);

				resource_list_destroy_entry(win);

			}

			break;

		case IORESOURCE_MEM:

			pcie->offset.mem = res.start - range.pci_addr;

			memcpy(&pcie->mem, &res, sizeof(res));

			memcpy(&pcie->mem, win->res, sizeof(*win->res));

			pcie->mem.name = "non-prefetchable";

			break;

		case IORESOURCE_BUS:

			pcie->busnr = win->res->start;

			break;

		}

	}

	err = of_pci_parse_bus_range(node, &pcie->busn);

	if (err < 0) {

		dev_err(dev, "failed to parse bus ranges property: %d\n", err);

		pcie->busn.name = node->name;

		pcie->busn.start = 0;

		pcie->busn.end = 0xff;

		pcie->busn.flags = IORESOURCE_BUS;

	}

	for_each_available_child_of_node(node, child) {

		int slot;

	return 0;

}

static int mtk_pcie_request_resources(struct mtk_pcie *pcie)

{

	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);

	struct list_head *windows = &host->windows;

	struct device *dev = pcie->dev;

	int err;

	pci_add_resource_offset(windows, &pcie->pio, pcie->offset.io);

	pci_add_resource_offset(windows, &pcie->mem, pcie->offset.mem);

	pci_add_resource(windows, &pcie->busn);

	err = devm_request_pci_bus_resources(dev, windows);

	if (err < 0)

		return err;

	err = devm_pci_remap_iospace(dev, &pcie->pio, pcie->io.start);

	if (err)

		return err;

	return 0;

}

static int mtk_pcie_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	if (err)

		return err;

	err = mtk_pcie_request_resources(pcie);

	if (err)

		goto put_resources;

	host->busnr = pcie->busn.start;

	host->busnr = pcie->busnr;

	host->dev.parent = pcie->dev;

	host->ops = pcie->soc->ops;

	host->map_irq = of_irq_parse_and_map_pci;