include/linux/pci-epf.h

   1 /**
   2  * PCI Endpoint *Function* (EPF) header file
   3  *
   4  * Copyright (C) 2017 Texas Instruments
   5  * Author: Kishon Vijay Abraham I <kishon@ti.com>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 of
   9  * the License as published by the Free Software Foundation.
  10  */
  11
  12 #ifndef __LINUX_PCI_EPF_H
  13 #define __LINUX_PCI_EPF_H
  14
  15 #include <linux/device.h>
  16 #include <linux/mod_devicetable.h>
  17
  18 struct pci_epf;
  19
  20 enum pci_interrupt_pin {
  21         PCI_INTERRUPT_UNKNOWN,
  22         PCI_INTERRUPT_INTA,
  23         PCI_INTERRUPT_INTB,
  24         PCI_INTERRUPT_INTC,
  25         PCI_INTERRUPT_INTD,
  26 };
  27
  28 enum pci_barno {
  29         BAR_0,
  30         BAR_1,
  31         BAR_2,
  32         BAR_3,
  33         BAR_4,
  34         BAR_5,
  35 };
  36
  37 /**
  38  * struct pci_epf_header - represents standard configuration header
  39  * @vendorid: identifies device manufacturer
  40  * @deviceid: identifies a particular device
  41  * @revid: specifies a device-specific revision identifier
  42  * @progif_code: identifies a specific register-level programming interface
  43  * @subclass_code: identifies more specifically the function of the device
  44  * @baseclass_code: broadly classifies the type of function the device performs
  45  * @cache_line_size: specifies the system cacheline size in units of DWORDs
  46  * @subsys_vendor_id: vendor of the add-in card or subsystem
  47  * @subsys_id: id specific to vendor
  48  * @interrupt_pin: interrupt pin the device (or device function) uses
  49  */
  50 struct pci_epf_header {
  51         u16     vendorid;
  52         u16     deviceid;
  53         u8      revid;
  54         u8      progif_code;
  55         u8      subclass_code;
  56         u8      baseclass_code;
  57         u8      cache_line_size;
  58         u16     subsys_vendor_id;
  59         u16     subsys_id;
  60         enum pci_interrupt_pin interrupt_pin;
  61 };
  62
  63 /**
  64  * struct pci_epf_ops - set of function pointers for performing EPF operations
  65  * @bind: ops to perform when a EPC device has been bound to EPF device
  66  * @unbind: ops to perform when a binding has been lost between a EPC device
  67  *          and EPF device
  68  * @linkup: ops to perform when the EPC device has established a connection with
  69  *          a host system
  70  */
  71 struct pci_epf_ops {
  72         int     (*bind)(struct pci_epf *epf);
  73         void    (*unbind)(struct pci_epf *epf);
  74         void    (*linkup)(struct pci_epf *epf);
  75 };
  76
  77 /**
  78  * struct pci_epf_driver - represents the PCI EPF driver
  79  * @probe: ops to perform when a new EPF device has been bound to the EPF driver
  80  * @remove: ops to perform when the binding between the EPF device and EPF
  81  *          driver is broken
  82  * @driver: PCI EPF driver
  83  * @ops: set of function pointers for performing EPF operations
  84  * @owner: the owner of the module that registers the PCI EPF driver
  85  * @group: configfs group corresponding to the PCI EPF driver
  86  * @id_table: identifies EPF devices for probing
  87  */
  88 struct pci_epf_driver {
  89         int     (*probe)(struct pci_epf *epf);
  90         int     (*remove)(struct pci_epf *epf);
  91
  92         struct device_driver    driver;
  93         struct pci_epf_ops      *ops;
  94         struct module           *owner;
  95         struct config_group     *group;
  96         const struct pci_epf_device_id  *id_table;
  97 };
  98
  99 #define to_pci_epf_driver(drv) (container_of((drv), struct pci_epf_driver, \
 100                                 driver))
 101
 102 /**
 103  * struct pci_epf_bar - represents the BAR of EPF device
 104  * @phys_addr: physical address that should be mapped to the BAR
 105  * @size: the size of the address space present in BAR
 106  */
 107 struct pci_epf_bar {
 108         dma_addr_t      phys_addr;
 109         size_t          size;
 110 };
 111
 112 /**
 113  * struct pci_epf - represents the PCI EPF device
 114  * @dev: the PCI EPF device
 115  * @name: the name of the PCI EPF device
 116  * @header: represents standard configuration header
 117  * @bar: represents the BAR of EPF device
 118  * @msi_interrupts: number of MSI interrupts required by this function
 119  * @func_no: unique function number within this endpoint device
 120  * @epc: the EPC device to which this EPF device is bound
 121  * @driver: the EPF driver to which this EPF device is bound
 122  * @list: to add pci_epf as a list of PCI endpoint functions to pci_epc
 123  */
 124 struct pci_epf {
 125         struct device           dev;
 126         const char              *name;
 127         struct pci_epf_header   *header;
 128         struct pci_epf_bar      bar[6];
 129         u8                      msi_interrupts;
 130         u8                      func_no;
 131
 132         struct pci_epc          *epc;
 133         struct pci_epf_driver   *driver;
 134         struct list_head        list;
 135 };
 136
 137 #define to_pci_epf(epf_dev) container_of((epf_dev), struct pci_epf, dev)
 138
 139 #define pci_epf_register_driver(driver)    \
 140                 __pci_epf_register_driver((driver), THIS_MODULE)
 141
 142 static inline void epf_set_drvdata(struct pci_epf *epf, void *data)
 143 {
 144         dev_set_drvdata(&epf->dev, data);
 145 }
 146
 147 static inline void *epf_get_drvdata(struct pci_epf *epf)
 148 {
 149         return dev_get_drvdata(&epf->dev);
 150 }
 151
 152 struct pci_epf *pci_epf_create(const char *name);
 153 void pci_epf_destroy(struct pci_epf *epf);
 154 int __pci_epf_register_driver(struct pci_epf_driver *driver,
 155                               struct module *owner);
 156 void pci_epf_unregister_driver(struct pci_epf_driver *driver);
 157 void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar);
 158 void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar);
 159 int pci_epf_bind(struct pci_epf *epf);
 160 void pci_epf_unbind(struct pci_epf *epf);
 161 void pci_epf_linkup(struct pci_epf *epf);
 162 #endif /* __LINUX_PCI_EPF_H */