1/*
  2 * Simple, generic PCI host controller driver targetting firmware-initialised
  3 * systems and virtual machines (e.g. the PCI emulation provided by kvmtool).
  4 *
  5 * This program is free software; you can redistribute it and/or modify
  6 * it under the terms of the GNU General Public License version 2 as
  7 * published by the Free Software Foundation.
  8 *
  9 * This program is distributed in the hope that it will be useful,
 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12 * GNU General Public License for more details.
 13 *
 14 * You should have received a copy of the GNU General Public License
 15 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 16 *
 17 * Copyright (C) 2014 ARM Limited
 18 *
 19 * Author: Will Deacon <will.deacon@arm.com>
 20 */
 21
 22#include <linux/kernel.h>
 23#include <linux/module.h>
 24#include <linux/of_address.h>
 25#include <linux/of_pci.h>
 26#include <linux/platform_device.h>
 27
 28#include "pci-host-common.h"
 29
 30static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus,
 31					     unsigned int devfn,
 32					     int where)
 33{
 34	struct gen_pci *pci = bus->sysdata;
 35	resource_size_t idx = bus->number - pci->cfg.bus_range->start;
 36
 37	return pci->cfg.win[idx] + ((devfn << 8) | where);
 38}
 39
 40static struct gen_pci_cfg_bus_ops gen_pci_cfg_cam_bus_ops = {
 41	.bus_shift	= 16,
 42	.ops		= {
 43		.map_bus	= gen_pci_map_cfg_bus_cam,
 44		.read		= pci_generic_config_read,
 45		.write		= pci_generic_config_write,
 46	}
 47};
 48
 49static void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus,
 50					      unsigned int devfn,
 51					      int where)
 52{
 53	struct gen_pci *pci = bus->sysdata;
 54	resource_size_t idx = bus->number - pci->cfg.bus_range->start;
 55
 56	return pci->cfg.win[idx] + ((devfn << 12) | where);
 57}
 58
 59static struct gen_pci_cfg_bus_ops gen_pci_cfg_ecam_bus_ops = {
 60	.bus_shift	= 20,
 61	.ops		= {
 62		.map_bus	= gen_pci_map_cfg_bus_ecam,
 63		.read		= pci_generic_config_read,
 64		.write		= pci_generic_config_write,
 65	}
 66};
 67
 68static const struct of_device_id gen_pci_of_match[] = {
 69	{ .compatible = "pci-host-cam-generic",
 70	  .data = &gen_pci_cfg_cam_bus_ops },
 71
 72	{ .compatible = "pci-host-ecam-generic",
 73	  .data = &gen_pci_cfg_ecam_bus_ops },
 74
 75	{ },
 76};
 77MODULE_DEVICE_TABLE(of, gen_pci_of_match);
 78
 79static int gen_pci_probe(struct platform_device *pdev)
 80{
 81	struct device *dev = &pdev->dev;
 82	const struct of_device_id *of_id;
 83	struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
 84
 85	if (!pci)
 86		return -ENOMEM;
 87
 88	of_id = of_match_node(gen_pci_of_match, dev->of_node);
 89	pci->cfg.ops = (struct gen_pci_cfg_bus_ops *)of_id->data;
 90
 91	return pci_host_common_probe(pdev, pci);
 92}
 93
 94static struct platform_driver gen_pci_driver = {
 95	.driver = {
 96		.name = "pci-host-generic",
 97		.of_match_table = gen_pci_of_match,
 98	},
 99	.probe = gen_pci_probe,
100};
101module_platform_driver(gen_pci_driver);
102
103MODULE_DESCRIPTION("Generic PCI host driver");
104MODULE_AUTHOR("Will Deacon <will.deacon@arm.com>");
105MODULE_LICENSE("GPL v2");