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1// SPDX-License-Identifier: GPL-2.02/*3 * PCIe host controller driver for HiSilicon SoCs4 *5 * Copyright (C) 2015 HiSilicon Co., Ltd. http://www.hisilicon.com6 *7 * Authors: Zhou Wang <wangzhou1@hisilicon.com>8 * Dacai Zhu <zhudacai@hisilicon.com>9 * Gabriele Paoloni <gabriele.paoloni@huawei.com>10 */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"18 19#if defined(CONFIG_PCI_HISI) || (defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS))20 21struct hisi_pcie {22 void __iomem *reg_base;23};24 25static int hisi_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,26 int size, u32 *val)27{28 struct pci_config_window *cfg = bus->sysdata;29 int dev = PCI_SLOT(devfn);30 31 if (bus->number == cfg->busr.start) {32 /* access only one slot on each root port */33 if (dev > 0)34 return PCIBIOS_DEVICE_NOT_FOUND;35 else36 return pci_generic_config_read32(bus, devfn, where,37 size, val);38 }39 40 return pci_generic_config_read(bus, devfn, where, size, val);41}42 43static int hisi_pcie_wr_conf(struct pci_bus *bus, u32 devfn,44 int where, int size, u32 val)45{46 struct pci_config_window *cfg = bus->sysdata;47 int dev = PCI_SLOT(devfn);48 49 if (bus->number == cfg->busr.start) {50 /* access only one slot on each root port */51 if (dev > 0)52 return PCIBIOS_DEVICE_NOT_FOUND;53 else54 return pci_generic_config_write32(bus, devfn, where,55 size, val);56 }57 58 return pci_generic_config_write(bus, devfn, where, size, val);59}60 61static void __iomem *hisi_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,62 int where)63{64 struct pci_config_window *cfg = bus->sysdata;65 struct hisi_pcie *pcie = cfg->priv;66 67 if (bus->number == cfg->busr.start)68 return pcie->reg_base + where;69 else70 return pci_ecam_map_bus(bus, devfn, where);71}72 73#if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)74 75static int hisi_pcie_init(struct pci_config_window *cfg)76{77 struct device *dev = cfg->parent;78 struct hisi_pcie *pcie;79 struct acpi_device *adev = to_acpi_device(dev);80 struct acpi_pci_root *root = acpi_driver_data(adev);81 struct resource *res;82 int ret;83 84 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);85 if (!pcie)86 return -ENOMEM;87 88 /*89 * Retrieve RC base and size from a HISI0081 device with _UID90 * matching our segment.91 */92 res = devm_kzalloc(dev, sizeof(*res), GFP_KERNEL);93 if (!res)94 return -ENOMEM;95 96 ret = acpi_get_rc_resources(dev, "HISI0081", root->segment, res);97 if (ret) {98 dev_err(dev, "can't get rc base address\n");99 return -ENOMEM;100 }101 102 pcie->reg_base = devm_pci_remap_cfgspace(dev, res->start, resource_size(res));103 if (!pcie->reg_base)104 return -ENOMEM;105 106 cfg->priv = pcie;107 return 0;108}109 110const struct pci_ecam_ops hisi_pcie_ops = {111 .init = hisi_pcie_init,112 .pci_ops = {113 .map_bus = hisi_pcie_map_bus,114 .read = hisi_pcie_rd_conf,115 .write = hisi_pcie_wr_conf,116 }117};118 119#endif120 121#ifdef CONFIG_PCI_HISI122 123static int hisi_pcie_platform_init(struct pci_config_window *cfg)124{125 struct device *dev = cfg->parent;126 struct hisi_pcie *pcie;127 struct platform_device *pdev = to_platform_device(dev);128 struct resource *res;129 130 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);131 if (!pcie)132 return -ENOMEM;133 134 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);135 if (!res) {136 dev_err(dev, "missing \"reg[1]\"property\n");137 return -EINVAL;138 }139 140 pcie->reg_base = devm_pci_remap_cfgspace(dev, res->start, resource_size(res));141 if (!pcie->reg_base)142 return -ENOMEM;143 144 cfg->priv = pcie;145 return 0;146}147 148static const struct pci_ecam_ops hisi_pcie_platform_ops = {149 .init = hisi_pcie_platform_init,150 .pci_ops = {151 .map_bus = hisi_pcie_map_bus,152 .read = hisi_pcie_rd_conf,153 .write = hisi_pcie_wr_conf,154 }155};156 157static const struct of_device_id hisi_pcie_almost_ecam_of_match[] = {158 {159 .compatible = "hisilicon,hip06-pcie-ecam",160 .data = &hisi_pcie_platform_ops,161 },162 {163 .compatible = "hisilicon,hip07-pcie-ecam",164 .data = &hisi_pcie_platform_ops,165 },166 {},167};168 169static struct platform_driver hisi_pcie_almost_ecam_driver = {170 .probe = pci_host_common_probe,171 .driver = {172 .name = "hisi-pcie-almost-ecam",173 .of_match_table = hisi_pcie_almost_ecam_of_match,174 .suppress_bind_attrs = true,175 },176};177builtin_platform_driver(hisi_pcie_almost_ecam_driver);178 179#endif180#endif181