alistair23-linux/drivers/pci/controller/pcie-iproc-platform.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2015 Broadcom Corporation
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/phy/phy.h>

#include "../pci.h"
#include "pcie-iproc.h"

static const struct of_device_id iproc_pcie_of_match_table[] = {
	{
		.compatible = "brcm,iproc-pcie",
		.data = (int *)IPROC_PCIE_PAXB,
	}, {
		.compatible = "brcm,iproc-pcie-paxb-v2",
		.data = (int *)IPROC_PCIE_PAXB_V2,
	}, {
		.compatible = "brcm,iproc-pcie-paxc",
		.data = (int *)IPROC_PCIE_PAXC,
	}, {
		.compatible = "brcm,iproc-pcie-paxc-v2",
		.data = (int *)IPROC_PCIE_PAXC_V2,
	},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);

static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct iproc_pcie *pcie;
	struct device_node *np = dev->of_node;
	struct resource reg;
	resource_size_t iobase = 0;
	LIST_HEAD(resources);
	struct pci_host_bridge *bridge;
	int ret;

	bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
	if (!bridge)
		return -ENOMEM;

	pcie = pci_host_bridge_priv(bridge);

	pcie->dev = dev;
	pcie->type = (enum iproc_pcie_type) of_device_get_match_data(dev);

	ret = of_address_to_resource(np, 0, &reg);
	if (ret < 0) {
		dev_err(dev, "unable to obtain controller resources\n");
		return ret;
	}

	pcie->base = devm_pci_remap_cfgspace(dev, reg.start,
					     resource_size(&reg));
	if (!pcie->base) {
		dev_err(dev, "unable to map controller registers\n");
		return -ENOMEM;
	}
	pcie->base_addr = reg.start;

	if (of_property_read_bool(np, "brcm,pcie-ob")) {
		u32 val;

		ret = of_property_read_u32(np, "brcm,pcie-ob-axi-offset",
					   &val);
		if (ret) {
			dev_err(dev,
				"missing brcm,pcie-ob-axi-offset property\n");
			return ret;
		}
		pcie->ob.axi_offset = val;
		pcie->need_ob_cfg = true;
	}

	/*
	 * DT nodes are not used by all platforms that use the iProc PCIe
	 * core driver. For platforms that require explicit inbound mapping
	 * configuration, "dma-ranges" would have been present in DT
	 */
	pcie->need_ib_cfg = of_property_read_bool(np, "dma-ranges");

	/* PHY use is optional */
	pcie->phy = devm_phy_get(dev, "pcie-phy");
	if (IS_ERR(pcie->phy)) {
		if (PTR_ERR(pcie->phy) == -EPROBE_DEFER)
			return -EPROBE_DEFER;
		pcie->phy = NULL;
	}

	ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &resources,
						    &iobase);
	if (ret) {
		dev_err(dev, "unable to get PCI host bridge resources\n");
		return ret;
	}

	/* PAXC doesn't support legacy IRQs, skip mapping */
	switch (pcie->type) {
	case IPROC_PCIE_PAXC:
	case IPROC_PCIE_PAXC_V2:
		break;
	default:
		pcie->map_irq = of_irq_parse_and_map_pci;
	}

	ret = iproc_pcie_setup(pcie, &resources);
	if (ret) {
		dev_err(dev, "PCIe controller setup failed\n");
		pci_free_resource_list(&resources);
		return ret;
	}

	platform_set_drvdata(pdev, pcie);
	return 0;
}

static int iproc_pcie_pltfm_remove(struct platform_device *pdev)
{
	struct iproc_pcie *pcie = platform_get_drvdata(pdev);

	return iproc_pcie_remove(pcie);
}

static void iproc_pcie_pltfm_shutdown(struct platform_device *pdev)
{
	struct iproc_pcie *pcie = platform_get_drvdata(pdev);

	iproc_pcie_shutdown(pcie);
}

static struct platform_driver iproc_pcie_pltfm_driver = {
	.driver = {
		.name = "iproc-pcie",
		.of_match_table = of_match_ptr(iproc_pcie_of_match_table),
	},
	.probe = iproc_pcie_pltfm_probe,
	.remove = iproc_pcie_pltfm_remove,
	.shutdown = iproc_pcie_pltfm_shutdown,
};
module_platform_driver(iproc_pcie_pltfm_driver);

MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
MODULE_LICENSE("GPL v2");