// 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 <ramdisk.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 <asm/arch/rk_atags.h>
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DECLARE_GLOBAL_DATA_PTR;
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static ulong ramdisk_bread(struct udevice *dev, lbaint_t start,
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lbaint_t blkcnt, void *dst)
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{
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const struct ramdisk_ops *ops = dev_get_driver_ops(dev->parent);
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struct blk_desc *desc = dev_get_uclass_platdata(dev);
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if (!blkcnt)
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return 0;
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if (!ops->read)
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return -ENOSYS;
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return ops->read(desc, start, blkcnt, dst);
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}
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static ulong ramdisk_bwrite(struct udevice *dev, lbaint_t start,
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lbaint_t blkcnt, const void *src)
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{
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const struct ramdisk_ops *ops = dev_get_driver_ops(dev->parent);
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struct blk_desc *desc = dev_get_uclass_platdata(dev);
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if (!blkcnt)
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return 0;
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if (!ops->write)
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return -ENOSYS;
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return ops->write(desc, start, blkcnt, src);
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}
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static ulong ramdisk_berase(struct udevice *dev,
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lbaint_t start, lbaint_t blkcnt)
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{
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const struct ramdisk_ops *ops = dev_get_driver_ops(dev->parent);
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struct blk_desc *desc = dev_get_uclass_platdata(dev);
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if (!blkcnt)
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return 0;
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if (!ops->erase)
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return -ENOSYS;
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return ops->erase(desc, start, blkcnt);
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}
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int dm_ramdisk_is_enabled(void)
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{
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return (atags_is_available() && atags_get_tag(ATAG_RAM_PARTITION));
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}
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static const struct blk_ops ramdisk_blk_ops = {
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.read = ramdisk_bread,
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#ifndef CONFIG_SPL_BUILD
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.write = ramdisk_bwrite,
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.erase = ramdisk_berase,
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#endif
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};
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U_BOOT_DRIVER(ramdisk_blk) = {
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.name = "ramdisk_blk",
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.id = UCLASS_BLK,
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.ops = &ramdisk_blk_ops,
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};
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UCLASS_DRIVER(ramdisk) = {
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.id = UCLASS_RAMDISK,
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.name = "ramdisk",
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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};
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