drivers/uio/uio_dfl.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Generic DFL driver for Userspace I/O devicess
0004  *
0005  * Copyright (C) 2021 Intel Corporation, Inc.
0006  */
0007 #include <linux/dfl.h>
0008 #include <linux/errno.h>
0009 #include <linux/module.h>
0010 #include <linux/uio_driver.h>
0011
0012 #define DRIVER_NAME "uio_dfl"
0013
0014 static int uio_dfl_probe(struct dfl_device *ddev)
0015 {
0016     struct resource *r = &ddev->mmio_res;
0017     struct device *dev = &ddev->dev;
0018     struct uio_info *uioinfo;
0019     struct uio_mem *uiomem;
0020     int ret;
0021
0022     uioinfo = devm_kzalloc(dev, sizeof(struct uio_info), GFP_KERNEL);
0023     if (!uioinfo)
0024         return -ENOMEM;
0025
0026     uioinfo->name = DRIVER_NAME;
0027     uioinfo->version = "0";
0028
0029     uiomem = &uioinfo->mem[0];
0030     uiomem->memtype = UIO_MEM_PHYS;
0031     uiomem->addr = r->start & PAGE_MASK;
0032     uiomem->offs = r->start & ~PAGE_MASK;
0033     uiomem->size = (uiomem->offs + resource_size(r)
0034             + PAGE_SIZE - 1) & PAGE_MASK;
0035     uiomem->name = r->name;
0036
0037     /* Irq is yet to be supported */
0038     uioinfo->irq = UIO_IRQ_NONE;
0039
0040     ret = devm_uio_register_device(dev, uioinfo);
0041     if (ret)
0042         dev_err(dev, "unable to register uio device\n");
0043
0044     return ret;
0045 }
0046
0047 #define FME_FEATURE_ID_ETH_GROUP    0x10
0048 #define FME_FEATURE_ID_HSSI_SUBSYS  0x15
0049
0050 static const struct dfl_device_id uio_dfl_ids[] = {
0051     { FME_ID, FME_FEATURE_ID_ETH_GROUP },
0052     { FME_ID, FME_FEATURE_ID_HSSI_SUBSYS },
0053     { }
0054 };
0055 MODULE_DEVICE_TABLE(dfl, uio_dfl_ids);
0056
0057 static struct dfl_driver uio_dfl_driver = {
0058     .drv = {
0059         .name = DRIVER_NAME,
0060     },
0061     .id_table   = uio_dfl_ids,
0062     .probe      = uio_dfl_probe,
0063 };
0064 module_dfl_driver(uio_dfl_driver);
0065
0066 MODULE_DESCRIPTION("Generic DFL driver for Userspace I/O devices");
0067 MODULE_AUTHOR("Intel Corporation");
0068 MODULE_LICENSE("GPL v2");