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// SPDX-License-Identifier: GPL-2.0
/*
* PCIe host controller driver for HiSilicon SoCs
*
* Copyright (C) 2015 HiSilicon Co., Ltd. http://www.hisilicon.com
*
* Authors: Zhou Wang <wangzhou1@hisilicon.com>
* Dacai Zhu <zhudacai@hisilicon.com>
* Gabriele Paoloni <gabriele.paoloni@huawei.com>
*/
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/pci.h>
#include <linux/pci-acpi.h>
#include <linux/pci-ecam.h>
#include "../../pci.h"
#if defined(CONFIG_PCI_HISI) || (defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS))
struct hisi_pcie {
void __iomem *reg_base;
};
static int hisi_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
int size, u32 *val)
{
struct pci_config_window *cfg = bus->sysdata;
int dev = PCI_SLOT(devfn);
if (bus->number == cfg->busr.start) {
/* access only one slot on each root port */
if (dev > 0)
return PCIBIOS_DEVICE_NOT_FOUND;
else
return pci_generic_config_read32(bus, devfn, where,
size, val);
}
return pci_generic_config_read(bus, devfn, where, size, val);
}
static int hisi_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
int where, int size, u32 val)
{
struct pci_config_window *cfg = bus->sysdata;
int dev = PCI_SLOT(devfn);
if (bus->number == cfg->busr.start) {
/* access only one slot on each root port */
if (dev > 0)
return PCIBIOS_DEVICE_NOT_FOUND;
else
return pci_generic_config_write32(bus, devfn, where,
size, val);
}
return pci_generic_config_write(bus, devfn, where, size, val);
}
static void __iomem *hisi_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
int where)
{
struct pci_config_window *cfg = bus->sysdata;
struct hisi_pcie *pcie = cfg->priv;
if (bus->number == cfg->busr.start)
return pcie->reg_base + where;
else
return pci_ecam_map_bus(bus, devfn, where);
}
#if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)
static int hisi_pcie_init(struct pci_config_window *cfg)
{
struct device *dev = cfg->parent;
struct hisi_pcie *pcie;
struct acpi_device *adev = to_acpi_device(dev);
struct acpi_pci_root *root = acpi_driver_data(adev);
struct resource *res;
int ret;
pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
if (!pcie)
return -ENOMEM;
/*
* Retrieve RC base and size from a HISI0081 device with _UID
* matching our segment.
*/
res = devm_kzalloc(dev, sizeof(*res), GFP_KERNEL);
if (!res)
return -ENOMEM;
ret = acpi_get_rc_resources(dev, "HISI0081", root->segment, res);
if (ret) {
dev_err(dev, "can't get rc base address\n");
return -ENOMEM;
}
pcie->reg_base = devm_pci_remap_cfgspace(dev, res->start, resource_size(res));
if (!pcie->reg_base)
return -ENOMEM;
cfg->priv = pcie;
return 0;
}
const struct pci_ecam_ops hisi_pcie_ops = {
.init = hisi_pcie_init,
.pci_ops = {
.map_bus = hisi_pcie_map_bus,
.read = hisi_pcie_rd_conf,
.write = hisi_pcie_wr_conf,
}
};
#endif
#ifdef CONFIG_PCI_HISI
static int hisi_pcie_platform_init(struct pci_config_window *cfg)
{
struct device *dev = cfg->parent;
struct hisi_pcie *pcie;
struct platform_device *pdev = to_platform_device(dev);
struct resource *res;
pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
if (!pcie)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res) {
dev_err(dev, "missing \"reg[1]\"property\n");
return -EINVAL;
}
pcie->reg_base = devm_pci_remap_cfgspace(dev, res->start, resource_size(res));
if (!pcie->reg_base)
return -ENOMEM;
cfg->priv = pcie;
return 0;
}
static const struct pci_ecam_ops hisi_pcie_platform_ops = {
.init = hisi_pcie_platform_init,
.pci_ops = {
.map_bus = hisi_pcie_map_bus,
.read = hisi_pcie_rd_conf,
.write = hisi_pcie_wr_conf,
}
};
static const struct of_device_id hisi_pcie_almost_ecam_of_match[] = {
{
.compatible = "hisilicon,hip06-pcie-ecam",
.data = &hisi_pcie_platform_ops,
},
{
.compatible = "hisilicon,hip07-pcie-ecam",
.data = &hisi_pcie_platform_ops,
},
{},
};
static struct platform_driver hisi_pcie_almost_ecam_driver = {
.probe = pci_host_common_probe,
.driver = {
.name = "hisi-pcie-almost-ecam",
.of_match_table = hisi_pcie_almost_ecam_of_match,
.suppress_bind_attrs = true,
},
};
builtin_platform_driver(hisi_pcie_almost_ecam_driver);
#endif
#endif
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