// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2018 Rockchip Electronics Co., Ltd
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*/
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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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#include <dm/lists.h>
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#include <dm/root.h>
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#include <ramdisk.h>
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DECLARE_GLOBAL_DATA_PTR;
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static ulong ramdisk_ro_bread(struct blk_desc *desc, lbaint_t start,
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lbaint_t blkcnt, void *dst)
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{
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unsigned long b_size, b_start;
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/* Byte */
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b_start = start * desc->blksz;
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b_size = blkcnt * desc->blksz;
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if ((ulong)dst != (ulong)b_start)
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memcpy((char *)dst, (char *)b_start, b_size);
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else
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debug("%s: skip memcpy at: 0x%08lx\n", __func__, (ulong)b_start);
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debug("%s: b_start=0x%lx, b_size=0x%lx. dst=%p\n",
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__func__, b_start, b_size, dst);
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return blkcnt;
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}
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static int ramdisk_ro_bind(struct udevice *dev)
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{
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struct udevice *bdev;
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int ret;
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ret = blk_create_devicef(dev, "ramdisk_blk", "blk",
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IF_TYPE_RAMDISK, 0, 512, 0, &bdev);
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if (ret) {
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debug("Can't create block device\n");
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return ret;
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}
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return 0;
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}
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static const struct ramdisk_ops ramdisk_ro_ops = {
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.read = ramdisk_ro_bread,
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};
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static const struct udevice_id ramdisk_ro_ids[] = {
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{ .compatible = "ramdisk-ro" },
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{ }
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};
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U_BOOT_DRIVER(ramdisk_ro) = {
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.name = "ramdisk-ro",
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.id = UCLASS_RAMDISK,
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.ops = &ramdisk_ro_ops,
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.of_match = ramdisk_ro_ids,
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.bind = ramdisk_ro_bind,
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};
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U_BOOT_DEVICE(ramdisk_ro) = {
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.name = "ramdisk-ro",
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};
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