279 lines
6.9 KiB
C
279 lines
6.9 KiB
C
/*
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* Simple, generic PCI host controller driver targetting firmware-initialised
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* systems and virtual machines (e.g. the PCI emulation provided by kvmtool).
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*
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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/platform_device.h>
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struct gen_pci_cfg_bus_ops {
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u32 bus_shift;
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struct pci_ops ops;
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};
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struct gen_pci_cfg_windows {
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struct resource res;
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struct resource *bus_range;
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void __iomem **win;
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struct gen_pci_cfg_bus_ops *ops;
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};
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struct gen_pci {
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struct pci_host_bridge host;
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struct gen_pci_cfg_windows cfg;
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struct list_head resources;
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};
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static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus,
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unsigned int devfn,
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int where)
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{
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struct gen_pci *pci = bus->sysdata;
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resource_size_t idx = bus->number - pci->cfg.bus_range->start;
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return pci->cfg.win[idx] + ((devfn << 8) | where);
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}
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static struct gen_pci_cfg_bus_ops gen_pci_cfg_cam_bus_ops = {
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.bus_shift = 16,
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.ops = {
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.map_bus = gen_pci_map_cfg_bus_cam,
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.read = pci_generic_config_read,
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.write = pci_generic_config_write,
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}
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};
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static void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus,
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unsigned int devfn,
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int where)
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{
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struct gen_pci *pci = bus->sysdata;
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resource_size_t idx = bus->number - pci->cfg.bus_range->start;
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return pci->cfg.win[idx] + ((devfn << 12) | where);
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}
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static struct gen_pci_cfg_bus_ops gen_pci_cfg_ecam_bus_ops = {
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.bus_shift = 20,
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.ops = {
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.map_bus = gen_pci_map_cfg_bus_ecam,
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.read = pci_generic_config_read,
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.write = pci_generic_config_write,
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}
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};
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static const struct of_device_id gen_pci_of_match[] = {
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{ .compatible = "pci-host-cam-generic",
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.data = &gen_pci_cfg_cam_bus_ops },
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{ .compatible = "pci-host-ecam-generic",
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.data = &gen_pci_cfg_ecam_bus_ops },
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{ },
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};
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MODULE_DEVICE_TABLE(of, gen_pci_of_match);
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static void gen_pci_release_of_pci_ranges(struct gen_pci *pci)
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{
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pci_free_resource_list(&pci->resources);
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}
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static int gen_pci_parse_request_of_pci_ranges(struct gen_pci *pci)
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{
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int err, res_valid = 0;
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struct device *dev = pci->host.dev.parent;
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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, &pci->resources,
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&iobase);
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if (err)
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return err;
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resource_list_for_each_entry(win, &pci->resources) {
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struct resource *parent, *res = win->res;
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switch (resource_type(res)) {
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case IORESOURCE_IO:
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parent = &ioport_resource;
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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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continue;
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}
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break;
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case IORESOURCE_MEM:
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parent = &iomem_resource;
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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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pci->cfg.bus_range = res;
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default:
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continue;
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}
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err = devm_request_resource(dev, parent, res);
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if (err)
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goto out_release_res;
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}
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if (!res_valid) {
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dev_err(dev, "non-prefetchable memory resource required\n");
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err = -EINVAL;
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goto out_release_res;
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}
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return 0;
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out_release_res:
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gen_pci_release_of_pci_ranges(pci);
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return err;
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}
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static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci)
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{
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int err;
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u8 bus_max;
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resource_size_t busn;
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struct resource *bus_range;
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struct device *dev = pci->host.dev.parent;
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struct device_node *np = dev->of_node;
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u32 sz = 1 << pci->cfg.ops->bus_shift;
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err = of_address_to_resource(np, 0, &pci->cfg.res);
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if (err) {
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dev_err(dev, "missing \"reg\" property\n");
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return err;
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}
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/* Limit the bus-range to fit within reg */
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bus_max = pci->cfg.bus_range->start +
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(resource_size(&pci->cfg.res) >> pci->cfg.ops->bus_shift) - 1;
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pci->cfg.bus_range->end = min_t(resource_size_t,
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pci->cfg.bus_range->end, bus_max);
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pci->cfg.win = devm_kcalloc(dev, resource_size(pci->cfg.bus_range),
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sizeof(*pci->cfg.win), GFP_KERNEL);
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if (!pci->cfg.win)
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return -ENOMEM;
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/* Map our Configuration Space windows */
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if (!devm_request_mem_region(dev, pci->cfg.res.start,
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resource_size(&pci->cfg.res),
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"Configuration Space"))
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return -ENOMEM;
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bus_range = pci->cfg.bus_range;
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for (busn = bus_range->start; busn <= bus_range->end; ++busn) {
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u32 idx = busn - bus_range->start;
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pci->cfg.win[idx] = devm_ioremap(dev,
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pci->cfg.res.start + idx * sz,
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sz);
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if (!pci->cfg.win[idx])
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return -ENOMEM;
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}
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return 0;
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}
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static int gen_pci_probe(struct platform_device *pdev)
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{
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int err;
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const char *type;
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const struct of_device_id *of_id;
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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 gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
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struct pci_bus *bus, *child;
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if (!pci)
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return -ENOMEM;
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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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of_id = of_match_node(gen_pci_of_match, np);
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pci->cfg.ops = (struct gen_pci_cfg_bus_ops *)of_id->data;
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pci->host.dev.parent = dev;
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INIT_LIST_HEAD(&pci->host.windows);
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INIT_LIST_HEAD(&pci->resources);
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/* Parse our PCI ranges and request their resources */
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err = gen_pci_parse_request_of_pci_ranges(pci);
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if (err)
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return err;
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/* Parse and map our Configuration Space windows */
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err = gen_pci_parse_map_cfg_windows(pci);
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if (err) {
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gen_pci_release_of_pci_ranges(pci);
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return err;
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}
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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, pci->cfg.bus_range->start,
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&pci->cfg.ops->ops, pci, &pci->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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if (!pci_has_flag(PCI_PROBE_ONLY)) {
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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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static struct platform_driver gen_pci_driver = {
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.driver = {
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.name = "pci-host-generic",
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.of_match_table = gen_pci_of_match,
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},
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.probe = gen_pci_probe,
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};
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module_platform_driver(gen_pci_driver);
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MODULE_DESCRIPTION("Generic PCI host driver");
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MODULE_AUTHOR("Will Deacon <will.deacon@arm.com>");
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MODULE_LICENSE("GPL v2");
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