include/linux/pci-ecam.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright 2016 Broadcom
   4  */
   5 #ifndef DRIVERS_PCI_ECAM_H
   6 #define DRIVERS_PCI_ECAM_H
   7
   8 #include <linux/pci.h>
   9 #include <linux/kernel.h>
  10 #include <linux/platform_device.h>
  11
  12 /*
  13  * struct to hold pci ops and bus shift of the config window
  14  * for a PCI controller.
  15  */
  16 struct pci_config_window;
  17 struct pci_ecam_ops {
  18         unsigned int                    bus_shift;
  19         struct pci_ops                  pci_ops;
  20         int                             (*init)(struct pci_config_window *);
  21 };
  22
  23 /*
  24  * struct to hold the mappings of a config space window. This
  25  * is expected to be used as sysdata for PCI controllers that
  26  * use ECAM.
  27  */
  28 struct pci_config_window {
  29         struct resource                 res;
  30         struct resource                 busr;
  31         void                            *priv;
  32         struct pci_ecam_ops             *ops;
  33         union {
  34                 void __iomem            *win;   /* 64-bit single mapping */
  35                 void __iomem            **winp; /* 32-bit per-bus mapping */
  36         };
  37         struct device                   *parent;/* ECAM res was from this dev */
  38 };
  39
  40 /* create and free pci_config_window */
  41 struct pci_config_window *pci_ecam_create(struct device *dev,
  42                 struct resource *cfgres, struct resource *busr,
  43                 struct pci_ecam_ops *ops);
  44 void pci_ecam_free(struct pci_config_window *cfg);
  45
  46 /* map_bus when ->sysdata is an instance of pci_config_window */
  47 void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn,
  48                                int where);
  49 /* default ECAM ops */
  50 extern struct pci_ecam_ops pci_generic_ecam_ops;
  51
  52 #if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)
  53 extern struct pci_ecam_ops pci_32b_ops;         /* 32-bit accesses only */
  54 extern struct pci_ecam_ops hisi_pcie_ops;       /* HiSilicon */
  55 extern struct pci_ecam_ops thunder_pem_ecam_ops; /* Cavium ThunderX 1.x & 2.x */
  56 extern struct pci_ecam_ops pci_thunder_ecam_ops; /* Cavium ThunderX 1.x */
  57 extern struct pci_ecam_ops xgene_v1_pcie_ecam_ops; /* APM X-Gene PCIe v1 */
  58 extern struct pci_ecam_ops xgene_v2_pcie_ecam_ops; /* APM X-Gene PCIe v2.x */
  59 #endif
  60
  61 #ifdef CONFIG_PCI_HOST_COMMON
  62 /* for DT-based PCI controllers that support ECAM */
  63 int pci_host_common_probe(struct platform_device *pdev,
  64                           struct pci_ecam_ops *ops);
  65 #endif
  66 #endif