diff options
| author | Xu Yilun <yilun.xu@intel.com> | 2021-03-08 09:59:35 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-28 14:58:18 +0200 |
| commit | bbfb54e7b3e484943f8c00c58a0d6549e9078640 (patch) | |
| tree | 896ac45a67a19fbd58308c20aaa0da9cd5491f8f /drivers/uio/uio_dfl.c | |
| parent | db3a4f0abefd7be96089fcd74029c259df3bed76 (diff) | |
| download | linux-bbfb54e7b3e484943f8c00c58a0d6549e9078640.tar.bz2 | |
uio: uio_dfl: add userspace i/o driver for DFL bus
This patch supports the DFL drivers be written in userspace. This is
realized by exposing the userspace I/O device interfaces.
The driver now only binds the ether group feature, which has no irq. So
the irq support is not implemented yet.
Reviewed-by: Tom Rix <trix@redhat.com>
Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/1615168776-8553-2-git-send-email-yilun.xu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/uio/uio_dfl.c')
| -rw-r--r-- | drivers/uio/uio_dfl.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/uio/uio_dfl.c b/drivers/uio/uio_dfl.c new file mode 100644 index 000000000000..89c0fc7b0cbc --- /dev/null +++ b/drivers/uio/uio_dfl.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Generic DFL driver for Userspace I/O devicess + * + * Copyright (C) 2021 Intel Corporation, Inc. + */ +#include <linux/dfl.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/uio_driver.h> + +#define DRIVER_NAME "uio_dfl" + +static int uio_dfl_probe(struct dfl_device *ddev) +{ + struct resource *r = &ddev->mmio_res; + struct device *dev = &ddev->dev; + struct uio_info *uioinfo; + struct uio_mem *uiomem; + int ret; + + uioinfo = devm_kzalloc(dev, sizeof(struct uio_info), GFP_KERNEL); + if (!uioinfo) + return -ENOMEM; + + uioinfo->name = DRIVER_NAME; + uioinfo->version = "0"; + + uiomem = &uioinfo->mem[0]; + uiomem->memtype = UIO_MEM_PHYS; + uiomem->addr = r->start & PAGE_MASK; + uiomem->offs = r->start & ~PAGE_MASK; + uiomem->size = (uiomem->offs + resource_size(r) + + PAGE_SIZE - 1) & PAGE_MASK; + uiomem->name = r->name; + + /* Irq is yet to be supported */ + uioinfo->irq = UIO_IRQ_NONE; + + ret = devm_uio_register_device(dev, uioinfo); + if (ret) + dev_err(dev, "unable to register uio device\n"); + + return ret; +} + +#define FME_FEATURE_ID_ETH_GROUP 0x10 + +static const struct dfl_device_id uio_dfl_ids[] = { + { FME_ID, FME_FEATURE_ID_ETH_GROUP }, + { } +}; +MODULE_DEVICE_TABLE(dfl, uio_dfl_ids); + +static struct dfl_driver uio_dfl_driver = { + .drv = { + .name = DRIVER_NAME, + }, + .id_table = uio_dfl_ids, + .probe = uio_dfl_probe, +}; +module_dfl_driver(uio_dfl_driver); + +MODULE_DESCRIPTION("Generic DFL driver for Userspace I/O devices"); +MODULE_AUTHOR("Intel Corporation"); +MODULE_LICENSE("GPL v2"); |