1 // SPDX-License-Identifier: GPL-2.0
3 * PCIe host controller driver for HiSilicon SoCs
5 * Copyright (C) 2015 HiSilicon Co., Ltd. http://www.hisilicon.com
11 #include <linux/interrupt.h>
12 #include <linux/init.h>
13 #include <linux/platform_device.h>
14 #include <linux/pci.h>
15 #include <linux/pci-acpi.h>
16 #include <linux/pci-ecam.h>
17 #include "../../pci.h"
19 #if defined(CONFIG_PCI_HISI) || (defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS))
21 static int hisi_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
24 struct pci_config_window *cfg = bus->sysdata;
25 int dev = PCI_SLOT(devfn);
27 if (bus->number == cfg->busr.start) {
28 /* access only one slot on each root port */
30 return PCIBIOS_DEVICE_NOT_FOUND;
32 return pci_generic_config_read32(bus, devfn, where,
36 return pci_generic_config_read(bus, devfn, where, size, val);
39 static int hisi_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
40 int where, int size, u32 val)
42 struct pci_config_window *cfg = bus->sysdata;
43 int dev = PCI_SLOT(devfn);
45 if (bus->number == cfg->busr.start) {
46 /* access only one slot on each root port */
48 return PCIBIOS_DEVICE_NOT_FOUND;
50 return pci_generic_config_write32(bus, devfn, where,
54 return pci_generic_config_write(bus, devfn, where, size, val);
57 static void __iomem *hisi_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
60 struct pci_config_window *cfg = bus->sysdata;
61 void __iomem *reg_base = cfg->priv;
63 if (bus->number == cfg->busr.start)
64 return reg_base + where;
66 return pci_ecam_map_bus(bus, devfn, where);
69 #if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)
71 static int hisi_pcie_init(struct pci_config_window *cfg)
73 struct device *dev = cfg->parent;
74 struct acpi_device *adev = to_acpi_device(dev);
75 struct acpi_pci_root *root = acpi_driver_data(adev);
77 void __iomem *reg_base;
81 * Retrieve RC base and size from a HISI0081 device with _UID
82 * matching our segment.
84 res = devm_kzalloc(dev, sizeof(*res), GFP_KERNEL);
88 ret = acpi_get_rc_resources(dev, "HISI0081", root->segment, res);
90 dev_err(dev, "can't get rc base address\n");
94 reg_base = devm_pci_remap_cfgspace(dev, res->start, resource_size(res));
102 const struct pci_ecam_ops hisi_pcie_ops = {
104 .init = hisi_pcie_init,
106 .map_bus = hisi_pcie_map_bus,
107 .read = hisi_pcie_rd_conf,
108 .write = hisi_pcie_wr_conf,
114 #ifdef CONFIG_PCI_HISI
116 static int hisi_pcie_platform_init(struct pci_config_window *cfg)
118 struct device *dev = cfg->parent;
119 struct platform_device *pdev = to_platform_device(dev);
120 struct resource *res;
121 void __iomem *reg_base;
123 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
125 dev_err(dev, "missing \"reg[1]\"property\n");
129 reg_base = devm_pci_remap_cfgspace(dev, res->start, resource_size(res));
133 cfg->priv = reg_base;
137 static const struct pci_ecam_ops hisi_pcie_platform_ops = {
139 .init = hisi_pcie_platform_init,
141 .map_bus = hisi_pcie_map_bus,
142 .read = hisi_pcie_rd_conf,
143 .write = hisi_pcie_wr_conf,
147 static const struct of_device_id hisi_pcie_almost_ecam_of_match[] = {
149 .compatible = "hisilicon,hip06-pcie-ecam",
150 .data = &hisi_pcie_platform_ops,
153 .compatible = "hisilicon,hip07-pcie-ecam",
154 .data = &hisi_pcie_platform_ops,
159 static struct platform_driver hisi_pcie_almost_ecam_driver = {
160 .probe = pci_host_common_probe,
162 .name = "hisi-pcie-almost-ecam",
163 .of_match_table = hisi_pcie_almost_ecam_of_match,
164 .suppress_bind_attrs = true,
167 builtin_platform_driver(hisi_pcie_almost_ecam_driver);