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  * @revision: revision of this dfl device feature.
  31  * @mmio_res: mmio resource of this dfl device.
  32  * @irqs: list of Linux IRQ numbers of this dfl device.
  33  * @num_irqs: number of IRQs supported by this dfl device.
  34  * @cdev: pointer to DFL FPGA container device this dfl device belongs to.
  35  * @id_entry: matched id entry in dfl driver's id table.
  36  * @dfh_version: version of DFH for the device
  37  * @param_size: size of the block parameters in bytes
  38  * @params: pointer to block of parameters copied memory
  39  */
  40 struct dfl_device {
  41         struct device dev;
  42         int id;
  43         u16 type;
  44         u16 feature_id;
  45         u8 revision;
  46         struct resource mmio_res;
  47         int *irqs;
  48         unsigned int num_irqs;
  49         struct dfl_fpga_cdev *cdev;
  50         const struct dfl_device_id *id_entry;
  51         u8 dfh_version;
  52         unsigned int param_size;
  53         void *params;
  54 };
  55
  56 /**
  57  * struct dfl_driver - represent an dfl device driver
  58  *
  59  * @drv: driver model structure.
  60  * @id_table: pointer to table of device IDs the driver is interested in.
  61  *            { } member terminated.
  62  * @probe: mandatory callback for device binding.
  63  * @remove: callback for device unbinding.
  64  */
  65 struct dfl_driver {
  66         struct device_driver drv;
  67         const struct dfl_device_id *id_table;
  68
  69         int (*probe)(struct dfl_device *dfl_dev);
  70         void (*remove)(struct dfl_device *dfl_dev);
  71 };
  72
  73 #define to_dfl_dev(d) container_of(d, struct dfl_device, dev)
  74 #define to_dfl_drv(d) container_of_const(d, struct dfl_driver, drv)
  75
  76 /*
  77  * use a macro to avoid include chaining to get THIS_MODULE.
  78  */
  79 #define dfl_driver_register(drv) \
  80         __dfl_driver_register(drv, THIS_MODULE)
  81 int __dfl_driver_register(struct dfl_driver *dfl_drv, struct module *owner);
  82 void dfl_driver_unregister(struct dfl_driver *dfl_drv);
  83
  84 /*
  85  * module_dfl_driver() - Helper macro for drivers that don't do
  86  * anything special in module init/exit.  This eliminates a lot of
  87  * boilerplate.  Each module may only use this macro once, and
  88  * calling it replaces module_init() and module_exit().
  89  */
  90 #define module_dfl_driver(__dfl_driver) \
  91         module_driver(__dfl_driver, dfl_driver_register, \
  92                       dfl_driver_unregister)
  93
  94 void *dfh_find_param(struct dfl_device *dfl_dev, int param_id, size_t *pcount);
  95 #endif /* __LINUX_DFL_H */