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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
*
* Authors:
* Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
*/
#include <dm.h>
#include <log.h>
#include <mapmem.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include <linux/errno.h>
#include "nvmxip.h"
/**
* nvmxip_blk_read() - block device read operation
* @dev: the block device
* @blknr: first block number to read from
* @blkcnt: number of blocks to read
* @buffer: destination buffer
*
* Read data from the block storage device.
*
* Return:
*
* number of blocks read on success. Otherwise, failure
*/
static ulong nvmxip_blk_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, void *buffer)
{
struct nvmxip_plat *plat = dev_get_plat(dev->parent);
struct blk_desc *desc = dev_get_uclass_plat(dev);
/* number of bytes to read */
u32 size = blkcnt * desc->blksz;
/* physical address of the first block to read */
phys_addr_t blkaddr = plat->phys_base + blknr * desc->blksz;
void *virt_blkaddr;
uint qdata_idx;
if (!buffer)
return -EINVAL;
log_debug("[%s]: reading from blknr: %lu , blkcnt: %lu\n", dev->name, blknr, blkcnt);
virt_blkaddr = map_sysmem(blkaddr, 0);
/* assumption: the data is virtually contiguous */
#if IS_ENABLED(CONFIG_PHYS_64BIT)
for (qdata_idx = 0 ; qdata_idx < size; qdata_idx += sizeof(u64))
*(u64 *)(buffer + qdata_idx) = readq(virt_blkaddr + qdata_idx);
#else
for (qdata_idx = 0 ; qdata_idx < size; qdata_idx += sizeof(u32))
*(u32 *)(buffer + qdata_idx) = readl(virt_blkaddr + qdata_idx);
#endif
log_debug("[%s]: src[0]: 0x%llx , dst[0]: 0x%llx , src[-1]: 0x%llx , dst[-1]: 0x%llx\n",
dev->name,
*(u64 *)virt_blkaddr,
*(u64 *)buffer,
*(u64 *)((u8 *)virt_blkaddr + desc->blksz * blkcnt - sizeof(u64)),
*(u64 *)((u8 *)buffer + desc->blksz * blkcnt - sizeof(u64)));
unmap_sysmem(virt_blkaddr);
return blkcnt;
}
/**
* nvmxip_blk_probe() - block storage device probe
* @dev: the block storage device
*
* Initialize the block storage descriptor.
*
* Return:
*
* Always return 0.
*/
static int nvmxip_blk_probe(struct udevice *dev)
{
struct nvmxip_plat *plat = dev_get_plat(dev->parent);
struct blk_desc *desc = dev_get_uclass_plat(dev);
desc->lba = plat->lba;
desc->log2blksz = plat->lba_shift;
desc->blksz = BIT(plat->lba_shift);
desc->bdev = dev;
log_debug("[%s]: block storage layout\n lbas: %lu , log2blksz: %d, blksz: %lu\n",
dev->name, desc->lba, desc->log2blksz, desc->blksz);
return 0;
}
static const struct blk_ops nvmxip_blk_ops = {
.read = nvmxip_blk_read,
};
U_BOOT_DRIVER(nvmxip_blk) = {
.name = NVMXIP_BLKDRV_NAME,
.id = UCLASS_BLK,
.probe = nvmxip_blk_probe,
.ops = &nvmxip_blk_ops,
};
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