drivers/pci/controller/dwc/pcie-hisi.c - linux - Git at Google

 // 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/mfd/syscon.h>
 #include <linux/of_address.h>
 #include <linux/of_pci.h>
 #include <linux/platform_device.h>
 #include <linux/of_device.h>
 #include <linux/pci.h>
 #include <linux/pci-acpi.h>
 #include <linux/pci-ecam.h>
 #include <linux/regmap.h>
 #include "../../pci.h"

 #if defined(CONFIG_PCI_HISI) || (defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS))

 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;
 	void __iomem *reg_base = cfg->priv;

 	if (bus->number == cfg->busr.start)
 		return 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 acpi_device *adev = to_acpi_device(dev);
 	struct acpi_pci_root *root = acpi_driver_data(adev);
 	struct resource *res;
 	void __iomem *reg_base;
 	int ret;

 	/*
 	 * 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;
 	}

 	reg_base = devm_pci_remap_cfgspace(dev, res->start, resource_size(res));
 	if (!reg_base)
 		return -ENOMEM;

 	cfg->priv = reg_base;
 	return 0;
 }

 const struct pci_ecam_ops hisi_pcie_ops = {
 	.bus_shift    = 20,
 	.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

 #include "pcie-designware.h"

 #define PCIE_SUBCTRL_SYS_STATE4_REG		0x6818
 #define PCIE_HIP06_CTRL_OFF			0x1000
 #define PCIE_SYS_STATE4				(PCIE_HIP06_CTRL_OFF + 0x31c)
 #define PCIE_LTSSM_LINKUP_STATE			0x11
 #define PCIE_LTSSM_STATE_MASK			0x3F

 #define to_hisi_pcie(x)	dev_get_drvdata((x)->dev)

 struct hisi_pcie;

 struct pcie_soc_ops {
 	int (*hisi_pcie_link_up)(struct hisi_pcie *hisi_pcie);
 };

 struct hisi_pcie {
 	struct dw_pcie *pci;
 	struct regmap *subctrl;
 	u32 port_id;
 	const struct pcie_soc_ops *soc_ops;
 };

 /* HipXX PCIe host only supports 32-bit config access */
 static int hisi_pcie_cfg_read(struct pcie_port *pp, int where, int size,
 			      u32 *val)
 {
 	u32 reg;
 	u32 reg_val;
 	void *walker = &reg_val;
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);

 	walker += (where & 0x3);
 	reg = where & ~0x3;
 	reg_val = dw_pcie_readl_dbi(pci, reg);

 	if (size == 1)
 		*val = *(u8 __force *) walker;
 	else if (size == 2)
 		*val = *(u16 __force *) walker;
 	else if (size == 4)
 		*val = reg_val;
 	else
 		return PCIBIOS_BAD_REGISTER_NUMBER;

 	return PCIBIOS_SUCCESSFUL;
 }

 /* HipXX PCIe host only supports 32-bit config access */
 static int hisi_pcie_cfg_write(struct pcie_port *pp, int where, int  size,
 				u32 val)
 {
 	u32 reg_val;
 	u32 reg;
 	void *walker = &reg_val;
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);

 	walker += (where & 0x3);
 	reg = where & ~0x3;
 	if (size == 4)
 		dw_pcie_writel_dbi(pci, reg, val);
 	else if (size == 2) {
 		reg_val = dw_pcie_readl_dbi(pci, reg);
 		*(u16 __force *) walker = val;
 		dw_pcie_writel_dbi(pci, reg, reg_val);
 	} else if (size == 1) {
 		reg_val = dw_pcie_readl_dbi(pci, reg);
 		*(u8 __force *) walker = val;
 		dw_pcie_writel_dbi(pci, reg, reg_val);
 	} else
 		return PCIBIOS_BAD_REGISTER_NUMBER;

 	return PCIBIOS_SUCCESSFUL;
 }

 static int hisi_pcie_link_up_hip05(struct hisi_pcie *hisi_pcie)
 {
 	u32 val;

 	regmap_read(hisi_pcie->subctrl, PCIE_SUBCTRL_SYS_STATE4_REG +
 		    0x100 * hisi_pcie->port_id, &val);

 	return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE);
 }

 static int hisi_pcie_link_up_hip06(struct hisi_pcie *hisi_pcie)
 {
 	struct dw_pcie *pci = hisi_pcie->pci;
 	u32 val;

 	val = dw_pcie_readl_dbi(pci, PCIE_SYS_STATE4);

 	return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE);
 }

 static int hisi_pcie_link_up(struct dw_pcie *pci)
 {
 	struct hisi_pcie *hisi_pcie = to_hisi_pcie(pci);

 	return hisi_pcie->soc_ops->hisi_pcie_link_up(hisi_pcie);
 }

 static const struct dw_pcie_host_ops hisi_pcie_host_ops = {
 	.rd_own_conf = hisi_pcie_cfg_read,
 	.wr_own_conf = hisi_pcie_cfg_write,
 };

 static int hisi_add_pcie_port(struct hisi_pcie *hisi_pcie,
 			      struct platform_device *pdev)
 {
 	struct dw_pcie *pci = hisi_pcie->pci;
 	struct pcie_port *pp = &pci->pp;
 	struct device *dev = &pdev->dev;
 	int ret;
 	u32 port_id;

 	if (of_property_read_u32(dev->of_node, "port-id", &port_id)) {
 		dev_err(dev, "failed to read port-id\n");
 		return -EINVAL;
 	}
 	if (port_id > 3) {
 		dev_err(dev, "Invalid port-id: %d\n", port_id);
 		return -EINVAL;
 	}
 	hisi_pcie->port_id = port_id;

 	pp->ops = &hisi_pcie_host_ops;

 	ret = dw_pcie_host_init(pp);
 	if (ret) {
 		dev_err(dev, "failed to initialize host\n");
 		return ret;
 	}

 	return 0;
 }

 static const struct dw_pcie_ops dw_pcie_ops = {
 	.link_up = hisi_pcie_link_up,
 };

 static int hisi_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct dw_pcie *pci;
 	struct hisi_pcie *hisi_pcie;
 	struct resource *reg;
 	int ret;

 	hisi_pcie = devm_kzalloc(dev, sizeof(*hisi_pcie), GFP_KERNEL);
 	if (!hisi_pcie)
 		return -ENOMEM;

 	pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
 	if (!pci)
 		return -ENOMEM;

 	pci->dev = dev;
 	pci->ops = &dw_pcie_ops;

 	hisi_pcie->pci = pci;

 	hisi_pcie->soc_ops = of_device_get_match_data(dev);

 	hisi_pcie->subctrl =
 	    syscon_regmap_lookup_by_compatible("hisilicon,pcie-sas-subctrl");
 	if (IS_ERR(hisi_pcie->subctrl)) {
 		dev_err(dev, "cannot get subctrl base\n");
 		return PTR_ERR(hisi_pcie->subctrl);
 	}

 	reg = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbi");
 	pci->dbi_base = devm_pci_remap_cfg_resource(dev, reg);
 	if (IS_ERR(pci->dbi_base))
 		return PTR_ERR(pci->dbi_base);
 	platform_set_drvdata(pdev, hisi_pcie);

 	ret = hisi_add_pcie_port(hisi_pcie, pdev);
 	if (ret)
 		return ret;

 	return 0;
 }

 static struct pcie_soc_ops hip05_ops = {
 		&hisi_pcie_link_up_hip05
 };

 static struct pcie_soc_ops hip06_ops = {
 		&hisi_pcie_link_up_hip06
 };

 static const struct of_device_id hisi_pcie_of_match[] = {
 	{
 			.compatible = "hisilicon,hip05-pcie",
 			.data	    = (void *) &hip05_ops,
 	},
 	{
 			.compatible = "hisilicon,hip06-pcie",
 			.data	    = (void *) &hip06_ops,
 	},
 	{},
 };

 static struct platform_driver hisi_pcie_driver = {
 	.probe  = hisi_pcie_probe,
 	.driver = {
 		   .name = "hisi-pcie",
 		   .of_match_table = hisi_pcie_of_match,
 		   .suppress_bind_attrs = true,
 	},
 };
 builtin_platform_driver(hisi_pcie_driver);

 static int hisi_pcie_platform_init(struct pci_config_window *cfg)
 {
 	struct device *dev = cfg->parent;
 	struct platform_device *pdev = to_platform_device(dev);
 	struct resource *res;
 	void __iomem *reg_base;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	if (!res) {
 		dev_err(dev, "missing \"reg[1]\"property\n");
 		return -EINVAL;
 	}

 	reg_base = devm_pci_remap_cfgspace(dev, res->start, resource_size(res));
 	if (!reg_base)
 		return -ENOMEM;

 	cfg->priv = reg_base;
 	return 0;
 }

 static const struct pci_ecam_ops hisi_pcie_platform_ops = {
 	.bus_shift    = 20,
 	.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
	// 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/mfd/syscon.h>
	#include <linux/of_address.h>
	#include <linux/of_pci.h>
	#include <linux/platform_device.h>
	#include <linux/of_device.h>
	#include <linux/pci.h>
	#include <linux/pci-acpi.h>
	#include <linux/pci-ecam.h>
	#include <linux/regmap.h>
	#include "../../pci.h"

	#if defined(CONFIG_PCI_HISI) \|\| (defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS))

	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;
	void __iomem *reg_base = cfg->priv;

	if (bus->number == cfg->busr.start)
	return 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 acpi_device *adev = to_acpi_device(dev);
	struct acpi_pci_root *root = acpi_driver_data(adev);
	struct resource *res;
	void __iomem *reg_base;
	int ret;

	/*
	* 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;
	}

	reg_base = devm_pci_remap_cfgspace(dev, res->start, resource_size(res));
	if (!reg_base)
	return -ENOMEM;

	cfg->priv = reg_base;
	return 0;
	}

	const struct pci_ecam_ops hisi_pcie_ops = {
	.bus_shift = 20,
	.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

	#include "pcie-designware.h"

	#define PCIE_SUBCTRL_SYS_STATE4_REG 0x6818
	#define PCIE_HIP06_CTRL_OFF 0x1000
	#define PCIE_SYS_STATE4 (PCIE_HIP06_CTRL_OFF + 0x31c)
	#define PCIE_LTSSM_LINKUP_STATE 0x11
	#define PCIE_LTSSM_STATE_MASK 0x3F

	#define to_hisi_pcie(x) dev_get_drvdata((x)->dev)

	struct hisi_pcie;

	struct pcie_soc_ops {
	int (hisi_pcie_link_up)(struct hisi_pcie hisi_pcie);
	};

	struct hisi_pcie {
	struct dw_pcie *pci;
	struct regmap *subctrl;
	u32 port_id;
	const struct pcie_soc_ops *soc_ops;
	};

	/* HipXX PCIe host only supports 32-bit config access */
	static int hisi_pcie_cfg_read(struct pcie_port *pp, int where, int size,
	u32 *val)
	{
	u32 reg;
	u32 reg_val;
	void *walker = &reg_val;
	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);

	walker += (where & 0x3);
	reg = where & ~0x3;
	reg_val = dw_pcie_readl_dbi(pci, reg);

	if (size == 1)
	val = (u8 __force *) walker;
	else if (size == 2)
	val = (u16 __force *) walker;
	else if (size == 4)
	*val = reg_val;
	else
	return PCIBIOS_BAD_REGISTER_NUMBER;

	return PCIBIOS_SUCCESSFUL;
	}

	/* HipXX PCIe host only supports 32-bit config access */
	static int hisi_pcie_cfg_write(struct pcie_port *pp, int where, int size,
	u32 val)
	{
	u32 reg_val;
	u32 reg;
	void *walker = &reg_val;
	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);

	walker += (where & 0x3);
	reg = where & ~0x3;
	if (size == 4)
	dw_pcie_writel_dbi(pci, reg, val);
	else if (size == 2) {
	reg_val = dw_pcie_readl_dbi(pci, reg);
	(u16 __force ) walker = val;
	dw_pcie_writel_dbi(pci, reg, reg_val);
	} else if (size == 1) {
	reg_val = dw_pcie_readl_dbi(pci, reg);
	(u8 __force ) walker = val;
	dw_pcie_writel_dbi(pci, reg, reg_val);
	} else
	return PCIBIOS_BAD_REGISTER_NUMBER;

	return PCIBIOS_SUCCESSFUL;
	}

	static int hisi_pcie_link_up_hip05(struct hisi_pcie *hisi_pcie)
	{
	u32 val;

	regmap_read(hisi_pcie->subctrl, PCIE_SUBCTRL_SYS_STATE4_REG +
	0x100 * hisi_pcie->port_id, &val);

	return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE);
	}

	static int hisi_pcie_link_up_hip06(struct hisi_pcie *hisi_pcie)
	{
	struct dw_pcie *pci = hisi_pcie->pci;
	u32 val;

	val = dw_pcie_readl_dbi(pci, PCIE_SYS_STATE4);

	return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE);
	}

	static int hisi_pcie_link_up(struct dw_pcie *pci)
	{
	struct hisi_pcie *hisi_pcie = to_hisi_pcie(pci);

	return hisi_pcie->soc_ops->hisi_pcie_link_up(hisi_pcie);
	}

	static const struct dw_pcie_host_ops hisi_pcie_host_ops = {
	.rd_own_conf = hisi_pcie_cfg_read,
	.wr_own_conf = hisi_pcie_cfg_write,
	};

	static int hisi_add_pcie_port(struct hisi_pcie *hisi_pcie,
	struct platform_device *pdev)
	{
	struct dw_pcie *pci = hisi_pcie->pci;
	struct pcie_port *pp = &pci->pp;
	struct device *dev = &pdev->dev;
	int ret;
	u32 port_id;

	if (of_property_read_u32(dev->of_node, "port-id", &port_id)) {
	dev_err(dev, "failed to read port-id\n");
	return -EINVAL;
	}
	if (port_id > 3) {
	dev_err(dev, "Invalid port-id: %d\n", port_id);
	return -EINVAL;
	}
	hisi_pcie->port_id = port_id;

	pp->ops = &hisi_pcie_host_ops;

	ret = dw_pcie_host_init(pp);
	if (ret) {
	dev_err(dev, "failed to initialize host\n");
	return ret;
	}

	return 0;
	}

	static const struct dw_pcie_ops dw_pcie_ops = {
	.link_up = hisi_pcie_link_up,
	};

	static int hisi_pcie_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct dw_pcie *pci;
	struct hisi_pcie *hisi_pcie;
	struct resource *reg;
	int ret;

	hisi_pcie = devm_kzalloc(dev, sizeof(*hisi_pcie), GFP_KERNEL);
	if (!hisi_pcie)
	return -ENOMEM;

	pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
	if (!pci)
	return -ENOMEM;

	pci->dev = dev;
	pci->ops = &dw_pcie_ops;

	hisi_pcie->pci = pci;

	hisi_pcie->soc_ops = of_device_get_match_data(dev);

	hisi_pcie->subctrl =
	syscon_regmap_lookup_by_compatible("hisilicon,pcie-sas-subctrl");
	if (IS_ERR(hisi_pcie->subctrl)) {
	dev_err(dev, "cannot get subctrl base\n");
	return PTR_ERR(hisi_pcie->subctrl);
	}

	reg = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbi");
	pci->dbi_base = devm_pci_remap_cfg_resource(dev, reg);
	if (IS_ERR(pci->dbi_base))
	return PTR_ERR(pci->dbi_base);
	platform_set_drvdata(pdev, hisi_pcie);

	ret = hisi_add_pcie_port(hisi_pcie, pdev);
	if (ret)
	return ret;

	return 0;
	}

	static struct pcie_soc_ops hip05_ops = {
	&hisi_pcie_link_up_hip05
	};

	static struct pcie_soc_ops hip06_ops = {
	&hisi_pcie_link_up_hip06
	};

	static const struct of_device_id hisi_pcie_of_match[] = {
	{
	.compatible = "hisilicon,hip05-pcie",
	.data = (void *) &hip05_ops,
	},
	{
	.compatible = "hisilicon,hip06-pcie",
	.data = (void *) &hip06_ops,
	},
	{},
	};

	static struct platform_driver hisi_pcie_driver = {
	.probe = hisi_pcie_probe,
	.driver = {
	.name = "hisi-pcie",
	.of_match_table = hisi_pcie_of_match,
	.suppress_bind_attrs = true,
	},
	};
	builtin_platform_driver(hisi_pcie_driver);

	static int hisi_pcie_platform_init(struct pci_config_window *cfg)
	{
	struct device *dev = cfg->parent;
	struct platform_device *pdev = to_platform_device(dev);
	struct resource *res;
	void __iomem *reg_base;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (!res) {
	dev_err(dev, "missing \"reg[1]\"property\n");
	return -EINVAL;
	}

	reg_base = devm_pci_remap_cfgspace(dev, res->start, resource_size(res));
	if (!reg_base)
	return -ENOMEM;

	cfg->priv = reg_base;
	return 0;
	}

	static const struct pci_ecam_ops hisi_pcie_platform_ops = {
	.bus_shift = 20,
	.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