722bc5b5d9
Add initial infrastructure for Xen para-virtualized block device. This includes compile-time configuration and the skeleton for the future driver implementation. Add new class UCLASS_PVBLOCK which is going to be a parent for virtual block devices. Add new interface type IF_TYPE_PVBLOCK. Implement basic driver setup by reading XenStore configuration. Signed-off-by: Andrii Anisov <andrii_anisov@epam.com> Signed-off-by: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
121 lines
2.4 KiB
C
121 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2020 EPAM Systems Inc.
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*/
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#include <blk.h>
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#include <common.h>
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#include <dm.h>
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#include <dm/device-internal.h>
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#define DRV_NAME "pvblock"
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#define DRV_NAME_BLK "pvblock_blk"
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struct blkfront_dev {
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char dummy;
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};
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static int init_blkfront(unsigned int devid, struct blkfront_dev *dev)
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{
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return 0;
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}
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static void shutdown_blkfront(struct blkfront_dev *dev)
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{
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}
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ulong pvblock_blk_read(struct udevice *udev, lbaint_t blknr, lbaint_t blkcnt,
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void *buffer)
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{
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return 0;
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}
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ulong pvblock_blk_write(struct udevice *udev, lbaint_t blknr, lbaint_t blkcnt,
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const void *buffer)
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{
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return 0;
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}
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static int pvblock_blk_bind(struct udevice *udev)
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{
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return 0;
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}
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static int pvblock_blk_probe(struct udevice *udev)
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{
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struct blkfront_dev *blk_dev = dev_get_priv(udev);
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int ret;
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ret = init_blkfront(0, blk_dev);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int pvblock_blk_remove(struct udevice *udev)
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{
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struct blkfront_dev *blk_dev = dev_get_priv(udev);
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shutdown_blkfront(blk_dev);
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return 0;
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}
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static const struct blk_ops pvblock_blk_ops = {
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.read = pvblock_blk_read,
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.write = pvblock_blk_write,
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};
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U_BOOT_DRIVER(pvblock_blk) = {
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.name = DRV_NAME_BLK,
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.id = UCLASS_BLK,
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.ops = &pvblock_blk_ops,
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.bind = pvblock_blk_bind,
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.probe = pvblock_blk_probe,
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.remove = pvblock_blk_remove,
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.priv_auto_alloc_size = sizeof(struct blkfront_dev),
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.flags = DM_FLAG_OS_PREPARE,
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};
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/*******************************************************************************
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* Para-virtual block device class
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*******************************************************************************/
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void pvblock_init(void)
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{
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struct driver_info info;
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struct udevice *udev;
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struct uclass *uc;
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int ret;
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/*
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* At this point Xen drivers have already initialized,
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* so we can instantiate the class driver and enumerate
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* virtual block devices.
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*/
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info.name = DRV_NAME;
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ret = device_bind_by_name(gd->dm_root, false, &info, &udev);
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if (ret < 0)
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printf("Failed to bind " DRV_NAME ", ret: %d\n", ret);
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/* Bootstrap virtual block devices class driver */
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ret = uclass_get(UCLASS_PVBLOCK, &uc);
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if (ret)
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return;
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uclass_foreach_dev_probe(UCLASS_PVBLOCK, udev);
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}
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static int pvblock_probe(struct udevice *udev)
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{
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return 0;
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}
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U_BOOT_DRIVER(pvblock_drv) = {
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.name = DRV_NAME,
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.id = UCLASS_PVBLOCK,
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.probe = pvblock_probe,
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};
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UCLASS_DRIVER(pvblock) = {
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.name = DRV_NAME,
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.id = UCLASS_PVBLOCK,
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};
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