PCI: generic: Expose pci_host_common_probe() for use by other drivers (4e64dbe2) · Commits · e / devices / android_kernel_oneplus_sm8150

MAINTAINERS

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		@@ -8373,6 +8373,7 @@ L: linux-pci@vger.kernel.org
		L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
		S: Maintained
		F: Documentation/devicetree/bindings/pci/host-generic-pci.txt
		F: drivers/pci/host/pci-host-common.c
		F: drivers/pci/host/pci-host-generic.c

		PCI DRIVER FOR INTEL VOLUME MANAGEMENT DEVICE (VMD)

drivers/pci/host/Kconfig

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		@@ -53,9 +53,13 @@ config PCI_RCAR_GEN2_PCIE
		help
		Say Y here if you want PCIe controller support on R-Car Gen2 SoCs.

		config PCI_HOST_COMMON
		bool

		config PCI_HOST_GENERIC
		bool "Generic PCI host controller"
		depends on (ARM \|\| ARM64) && OF
		select PCI_HOST_COMMON
		help
		Say Y here if you want to support a simple generic PCI host
		controller, such as the one emulated by kvmtool.

drivers/pci/host/Makefile

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		@@ -6,6 +6,7 @@ obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
		obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
		obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
		obj-$(CONFIG_PCI_RCAR_GEN2_PCIE) += pcie-rcar.o
		obj-$(CONFIG_PCI_HOST_COMMON) += pci-host-common.o
		obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
		obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
		obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o

drivers/pci/host/pci-host-common.c

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		/*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* 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.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program. If not, see <http://www.gnu.org/licenses/>.
		*
		* Copyright (C) 2014 ARM Limited
		*
		* Author: Will Deacon <will.deacon@arm.com>
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/of_address.h>
		#include <linux/of_pci.h>
		#include <linux/platform_device.h>

		#include "pci-host-common.h"

		static void gen_pci_release_of_pci_ranges(struct gen_pci *pci)
		{
		pci_free_resource_list(&pci->resources);
		}

		static int gen_pci_parse_request_of_pci_ranges(struct gen_pci *pci)
		{
		int err, res_valid = 0;
		struct device *dev = pci->host.dev.parent;
		struct device_node *np = dev->of_node;
		resource_size_t iobase;
		struct resource_entry *win;

		err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pci->resources,
		&iobase);
		if (err)
		return err;

		resource_list_for_each_entry(win, &pci->resources) {
		struct resource parent, res = win->res;

		switch (resource_type(res)) {
		case IORESOURCE_IO:
		parent = &ioport_resource;
		err = pci_remap_iospace(res, iobase);
		if (err) {
		dev_warn(dev, "error %d: failed to map resource %pR\n",
		err, res);
		continue;
		}
		break;
		case IORESOURCE_MEM:
		parent = &iomem_resource;
		res_valid \|= !(res->flags & IORESOURCE_PREFETCH);
		break;
		case IORESOURCE_BUS:
		pci->cfg.bus_range = res;
		default:
		continue;
		}

		err = devm_request_resource(dev, parent, res);
		if (err)
		goto out_release_res;
		}

		if (!res_valid) {
		dev_err(dev, "non-prefetchable memory resource required\n");
		err = -EINVAL;
		goto out_release_res;
		}

		return 0;

		out_release_res:
		gen_pci_release_of_pci_ranges(pci);
		return err;
		}

		static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci)
		{
		int err;
		u8 bus_max;
		resource_size_t busn;
		struct resource *bus_range;
		struct device *dev = pci->host.dev.parent;
		struct device_node *np = dev->of_node;
		u32 sz = 1 << pci->cfg.ops->bus_shift;

		err = of_address_to_resource(np, 0, &pci->cfg.res);
		if (err) {
		dev_err(dev, "missing \"reg\" property\n");
		return err;
		}

		/* Limit the bus-range to fit within reg */
		bus_max = pci->cfg.bus_range->start +
		(resource_size(&pci->cfg.res) >> pci->cfg.ops->bus_shift) - 1;
		pci->cfg.bus_range->end = min_t(resource_size_t,
		pci->cfg.bus_range->end, bus_max);

		pci->cfg.win = devm_kcalloc(dev, resource_size(pci->cfg.bus_range),
		sizeof(*pci->cfg.win), GFP_KERNEL);
		if (!pci->cfg.win)
		return -ENOMEM;

		/* Map our Configuration Space windows */
		if (!devm_request_mem_region(dev, pci->cfg.res.start,
		resource_size(&pci->cfg.res),
		"Configuration Space"))
		return -ENOMEM;

		bus_range = pci->cfg.bus_range;
		for (busn = bus_range->start; busn <= bus_range->end; ++busn) {
		u32 idx = busn - bus_range->start;

		pci->cfg.win[idx] = devm_ioremap(dev,
		pci->cfg.res.start + idx * sz,
		sz);
		if (!pci->cfg.win[idx])
		return -ENOMEM;
		}

		return 0;
		}

		int pci_host_common_probe(struct platform_device *pdev,
		struct gen_pci *pci)
		{
		int err;
		const char *type;
		struct device *dev = &pdev->dev;
		struct device_node *np = dev->of_node;
		struct pci_bus bus, child;

		type = of_get_property(np, "device_type", NULL);
		if (!type \|\| strcmp(type, "pci")) {
		dev_err(dev, "invalid \"device_type\" %s\n", type);
		return -EINVAL;
		}

		of_pci_check_probe_only();

		pci->host.dev.parent = dev;
		INIT_LIST_HEAD(&pci->host.windows);
		INIT_LIST_HEAD(&pci->resources);

		/* Parse our PCI ranges and request their resources */
		err = gen_pci_parse_request_of_pci_ranges(pci);
		if (err)
		return err;

		/* Parse and map our Configuration Space windows */
		err = gen_pci_parse_map_cfg_windows(pci);
		if (err) {
		gen_pci_release_of_pci_ranges(pci);
		return err;
		}

		/* Do not reassign resources if probe only */
		if (!pci_has_flag(PCI_PROBE_ONLY))
		pci_add_flags(PCI_REASSIGN_ALL_RSRC \| PCI_REASSIGN_ALL_BUS);


		bus = pci_scan_root_bus(dev, pci->cfg.bus_range->start,
		&pci->cfg.ops->ops, pci, &pci->resources);
		if (!bus) {
		dev_err(dev, "Scanning rootbus failed");
		return -ENODEV;
		}

		pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);

		if (!pci_has_flag(PCI_PROBE_ONLY)) {
		pci_bus_size_bridges(bus);
		pci_bus_assign_resources(bus);

		list_for_each_entry(child, &bus->children, node)
		pcie_bus_configure_settings(child);
		}

		pci_bus_add_devices(bus);
		return 0;
		}

		MODULE_DESCRIPTION("Generic PCI host driver common code");
		MODULE_AUTHOR("Will Deacon <will.deacon@arm.com>");
		MODULE_LICENSE("GPL v2");

drivers/pci/host/pci-host-common.h

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		@@ -41,4 +41,7 @@ struct gen_pci {
		struct list_head resources;
		};

		int pci_host_common_probe(struct platform_device *pdev,
		struct gen_pci *pci);

		#endif /* _PCI_HOST_COMMON_H */