169 lines
4.2 KiB
C
169 lines
4.2 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright (C) 2014 ARM Limited
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*
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* Author: Will Deacon <will.deacon@arm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_pci.h>
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#include <linux/pci-ecam.h>
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#include <linux/platform_device.h>
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static int gen_pci_parse_request_of_pci_ranges(struct device *dev,
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struct list_head *resources, struct resource **bus_range)
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{
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int err, res_valid = 0;
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struct device_node *np = dev->of_node;
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resource_size_t iobase;
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struct resource_entry *win;
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err = of_pci_get_host_bridge_resources(np, 0, 0xff, resources, &iobase);
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if (err)
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return err;
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err = devm_request_pci_bus_resources(dev, resources);
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if (err)
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return err;
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resource_list_for_each_entry(win, resources) {
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struct resource *res = win->res;
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switch (resource_type(res)) {
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case IORESOURCE_IO:
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err = pci_remap_iospace(res, iobase);
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if (err)
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dev_warn(dev, "error %d: failed to map resource %pR\n",
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err, res);
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break;
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case IORESOURCE_MEM:
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res_valid |= !(res->flags & IORESOURCE_PREFETCH);
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break;
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case IORESOURCE_BUS:
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*bus_range = res;
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break;
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}
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}
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if (res_valid)
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return 0;
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dev_err(dev, "non-prefetchable memory resource required\n");
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return -EINVAL;
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}
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static void gen_pci_unmap_cfg(void *ptr)
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{
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pci_ecam_free((struct pci_config_window *)ptr);
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}
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static struct pci_config_window *gen_pci_init(struct device *dev,
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struct list_head *resources, struct pci_ecam_ops *ops)
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{
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int err;
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struct resource cfgres;
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struct resource *bus_range = NULL;
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struct pci_config_window *cfg;
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/* Parse our PCI ranges and request their resources */
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err = gen_pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
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if (err)
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goto err_out;
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err = of_address_to_resource(dev->of_node, 0, &cfgres);
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if (err) {
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dev_err(dev, "missing \"reg\" property\n");
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goto err_out;
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}
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cfg = pci_ecam_create(dev, &cfgres, bus_range, ops);
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if (IS_ERR(cfg)) {
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err = PTR_ERR(cfg);
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goto err_out;
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}
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err = devm_add_action(dev, gen_pci_unmap_cfg, cfg);
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if (err) {
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gen_pci_unmap_cfg(cfg);
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goto err_out;
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}
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return cfg;
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err_out:
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pci_free_resource_list(resources);
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return ERR_PTR(err);
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}
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int pci_host_common_probe(struct platform_device *pdev,
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struct pci_ecam_ops *ops)
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{
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const char *type;
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct pci_bus *bus, *child;
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struct pci_config_window *cfg;
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struct list_head resources;
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type = of_get_property(np, "device_type", NULL);
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if (!type || strcmp(type, "pci")) {
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dev_err(dev, "invalid \"device_type\" %s\n", type);
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return -EINVAL;
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}
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of_pci_check_probe_only();
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/* Parse and map our Configuration Space windows */
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INIT_LIST_HEAD(&resources);
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cfg = gen_pci_init(dev, &resources, ops);
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if (IS_ERR(cfg))
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return PTR_ERR(cfg);
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/* Do not reassign resources if probe only */
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if (!pci_has_flag(PCI_PROBE_ONLY))
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pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);
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bus = pci_scan_root_bus(dev, cfg->busr.start, &ops->pci_ops, cfg,
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&resources);
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if (!bus) {
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dev_err(dev, "Scanning rootbus failed");
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return -ENODEV;
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}
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pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
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/*
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* We insert PCI resources into the iomem_resource and
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* ioport_resource trees in either pci_bus_claim_resources()
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* or pci_bus_assign_resources().
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*/
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if (pci_has_flag(PCI_PROBE_ONLY)) {
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pci_bus_claim_resources(bus);
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} else {
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pci_bus_size_bridges(bus);
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pci_bus_assign_resources(bus);
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list_for_each_entry(child, &bus->children, node)
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pcie_bus_configure_settings(child);
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}
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pci_bus_add_devices(bus);
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return 0;
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}
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MODULE_DESCRIPTION("Generic PCI host driver common code");
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MODULE_AUTHOR("Will Deacon <will.deacon@arm.com>");
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MODULE_LICENSE("GPL v2");
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