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c9d9d11b85
Add a Device Feature List (DFL) feature id as a generic mechanism to expose a vendor-specific FPGA IP to user space. The feature id is intended for use with IPs that do not need any kernel services beyond exposure to user space through the UIO DFL driver. The feature id is used in, e.g., Intel Oak Springs Canyon IPUs to expose various IPs to user space, e.g., Network Controller Sideband Interface (NC-SI), BaseNIC, and VirtIO management. Link: https://github.com/OPAE/dfl-feature-id Signed-off-by: Peter Colberg <peter.colberg@intel.com> Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com> Reviewed-by: Russ Weight <russell.h.weight@intel.com> Link: https://lore.kernel.org/r/20230531030737.12989-1-peter.colberg@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Generic DFL driver for Userspace I/O devicess
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*
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* Copyright (C) 2021 Intel Corporation, Inc.
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*/
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#include <linux/dfl.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/uio_driver.h>
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#define DRIVER_NAME "uio_dfl"
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static int uio_dfl_probe(struct dfl_device *ddev)
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{
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struct resource *r = &ddev->mmio_res;
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struct device *dev = &ddev->dev;
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struct uio_info *uioinfo;
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struct uio_mem *uiomem;
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int ret;
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uioinfo = devm_kzalloc(dev, sizeof(struct uio_info), GFP_KERNEL);
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if (!uioinfo)
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return -ENOMEM;
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uioinfo->name = DRIVER_NAME;
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uioinfo->version = "0";
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uiomem = &uioinfo->mem[0];
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uiomem->memtype = UIO_MEM_PHYS;
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uiomem->addr = r->start & PAGE_MASK;
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uiomem->offs = r->start & ~PAGE_MASK;
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uiomem->size = (uiomem->offs + resource_size(r)
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+ PAGE_SIZE - 1) & PAGE_MASK;
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uiomem->name = r->name;
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/* Irq is yet to be supported */
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uioinfo->irq = UIO_IRQ_NONE;
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ret = devm_uio_register_device(dev, uioinfo);
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if (ret)
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dev_err(dev, "unable to register uio device\n");
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return ret;
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}
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#define FME_FEATURE_ID_ETH_GROUP 0x10
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#define FME_FEATURE_ID_HSSI_SUBSYS 0x15
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#define FME_FEATURE_ID_VENDOR_SPECIFIC 0x23
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#define PORT_FEATURE_ID_IOPLL_USRCLK 0x14
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static const struct dfl_device_id uio_dfl_ids[] = {
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{ FME_ID, FME_FEATURE_ID_ETH_GROUP },
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{ FME_ID, FME_FEATURE_ID_HSSI_SUBSYS },
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{ FME_ID, FME_FEATURE_ID_VENDOR_SPECIFIC },
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{ PORT_ID, PORT_FEATURE_ID_IOPLL_USRCLK },
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{ }
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};
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MODULE_DEVICE_TABLE(dfl, uio_dfl_ids);
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static struct dfl_driver uio_dfl_driver = {
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.drv = {
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.name = DRIVER_NAME,
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},
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.id_table = uio_dfl_ids,
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.probe = uio_dfl_probe,
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};
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module_dfl_driver(uio_dfl_driver);
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MODULE_DESCRIPTION("Generic DFL driver for Userspace I/O devices");
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MODULE_AUTHOR("Intel Corporation");
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MODULE_LICENSE("GPL v2");
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