include/linux/dfl.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Header file for DFL driver and device API
   4  *
   5  * Copyright (C) 2020 Intel Corporation, Inc.
   6  */
   7
   8 #ifndef __LINUX_DFL_H
   9 #define __LINUX_DFL_H
  10
  11 #include <linux/device.h>
  12 #include <linux/mod_devicetable.h>
  13
  14 /**
  15  * enum dfl_id_type - define the DFL FIU types
  16  */
  17 enum dfl_id_type {
  18         FME_ID = 0,
  19         PORT_ID = 1,
  20         DFL_ID_MAX,
  21 };
  22
  23 /**
  24  * struct dfl_device - represent an dfl device on dfl bus
  25  *
  26  * @dev: generic device interface.
  27  * @id: id of the dfl device.
  28  * @type: type of DFL FIU of the device. See enum dfl_id_type.
  29  * @feature_id: feature identifier local to its DFL FIU type.
  30  * @mmio_res: mmio resource of this dfl device.
  31  * @irqs: list of Linux IRQ numbers of this dfl device.
  32  * @num_irqs: number of IRQs supported by this dfl device.
  33  * @cdev: pointer to DFL FPGA container device this dfl device belongs to.
  34  * @id_entry: matched id entry in dfl driver's id table.
  35  */
  36 struct dfl_device {
  37         struct device dev;
  38         int id;
  39         u16 type;
  40         u16 feature_id;
  41         struct resource mmio_res;
  42         int *irqs;
  43         unsigned int num_irqs;
  44         struct dfl_fpga_cdev *cdev;
  45         const struct dfl_device_id *id_entry;
  46 };
  47
  48 /**
  49  * struct dfl_driver - represent an dfl device driver
  50  *
  51  * @drv: driver model structure.
  52  * @id_table: pointer to table of device IDs the driver is interested in.
  53  *            { } member terminated.
  54  * @probe: mandatory callback for device binding.
  55  * @remove: callback for device unbinding.
  56  */
  57 struct dfl_driver {
  58         struct device_driver drv;
  59         const struct dfl_device_id *id_table;
  60
  61         int (*probe)(struct dfl_device *dfl_dev);
  62         void (*remove)(struct dfl_device *dfl_dev);
  63 };
  64
  65 #define to_dfl_dev(d) container_of(d, struct dfl_device, dev)
  66 #define to_dfl_drv(d) container_of(d, struct dfl_driver, drv)
  67
  68 /*
  69  * use a macro to avoid include chaining to get THIS_MODULE.
  70  */
  71 #define dfl_driver_register(drv) \
  72         __dfl_driver_register(drv, THIS_MODULE)
  73 int __dfl_driver_register(struct dfl_driver *dfl_drv, struct module *owner);
  74 void dfl_driver_unregister(struct dfl_driver *dfl_drv);
  75
  76 /*
  77  * module_dfl_driver() - Helper macro for drivers that don't do
  78  * anything special in module init/exit.  This eliminates a lot of
  79  * boilerplate.  Each module may only use this macro once, and
  80  * calling it replaces module_init() and module_exit().
  81  */
  82 #define module_dfl_driver(__dfl_driver) \
  83         module_driver(__dfl_driver, dfl_driver_register, \
  84                       dfl_driver_unregister)
  85
  86 #endif /* __LINUX_DFL_H */