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https://github.com/AsahiLinux/u-boot
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f37af2760e
add block storage emulation for NVM XIP flash devices
Some paltforms such as Corstone-1000 need to see NVM XIP raw flash
as a block storage device with read only capability.
Here NVM flash devices are devices with addressable
memory (e.g: QSPI NOR flash).
The implementation is generic and can be used by different platforms.
Two drivers are provided as follows.
nvmxip-blk :
a generic block driver allowing to read from the XIP flash
nvmxip Uclass driver :
When a device is described in the DT and associated with
UCLASS_NVMXIP, the Uclass creates a block device and binds it with
the nvmxip-blk.
Platforms can use multiple NVM XIP devices at the same time by defining a
DT node for each one of them.
Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
119 lines
2.9 KiB
C
119 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
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*
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* Authors:
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* Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <mapmem.h>
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#include <asm/io.h>
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include "nvmxip.h"
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/**
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* nvmxip_mmio_rawread() - read from the XIP flash
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* @address: address of the data
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* @value: pointer to where storing the value read
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*
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* Read raw data from the XIP flash.
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*
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* Return:
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*
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* Always return 0.
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*/
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static int nvmxip_mmio_rawread(const phys_addr_t address, u64 *value)
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{
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*value = readq(address);
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return 0;
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}
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/**
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* nvmxip_blk_read() - block device read operation
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* @dev: the block device
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* @blknr: first block number to read from
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* @blkcnt: number of blocks to read
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* @buffer: destination buffer
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*
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* Read data from the block storage device.
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*
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* Return:
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*
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* number of blocks read on success. Otherwise, failure
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*/
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static ulong nvmxip_blk_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, void *buffer)
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{
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struct nvmxip_plat *plat = dev_get_plat(dev->parent);
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struct blk_desc *desc = dev_get_uclass_plat(dev);
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/* number of the u64 words to read */
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u32 qwords = (blkcnt * desc->blksz) / sizeof(u64);
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/* physical address of the first block to read */
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phys_addr_t blkaddr = plat->phys_base + blknr * desc->blksz;
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u64 *virt_blkaddr;
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u64 *pdst = buffer;
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uint qdata_idx;
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if (!pdst)
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return -EINVAL;
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log_debug("[%s]: reading from blknr: %lu , blkcnt: %lu\n", dev->name, blknr, blkcnt);
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virt_blkaddr = map_sysmem(blkaddr, 0);
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/* assumption: the data is virtually contiguous */
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for (qdata_idx = 0 ; qdata_idx < qwords ; qdata_idx++)
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nvmxip_mmio_rawread((phys_addr_t)(virt_blkaddr + qdata_idx), pdst++);
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log_debug("[%s]: src[0]: 0x%llx , dst[0]: 0x%llx , src[-1]: 0x%llx , dst[-1]: 0x%llx\n",
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dev->name,
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*virt_blkaddr,
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*(u64 *)buffer,
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*(u64 *)((u8 *)virt_blkaddr + desc->blksz * blkcnt - sizeof(u64)),
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*(u64 *)((u8 *)buffer + desc->blksz * blkcnt - sizeof(u64)));
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unmap_sysmem(virt_blkaddr);
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return blkcnt;
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}
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/**
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* nvmxip_blk_probe() - block storage device probe
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* @dev: the block storage device
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*
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* Initialize the block storage descriptor.
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*
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* Return:
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*
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* Always return 0.
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*/
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static int nvmxip_blk_probe(struct udevice *dev)
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{
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struct nvmxip_plat *plat = dev_get_plat(dev->parent);
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struct blk_desc *desc = dev_get_uclass_plat(dev);
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desc->lba = plat->lba;
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desc->log2blksz = plat->lba_shift;
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desc->blksz = BIT(plat->lba_shift);
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desc->bdev = dev;
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log_debug("[%s]: block storage layout\n lbas: %lu , log2blksz: %d, blksz: %lu\n",
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dev->name, desc->lba, desc->log2blksz, desc->blksz);
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return 0;
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}
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static const struct blk_ops nvmxip_blk_ops = {
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.read = nvmxip_blk_read,
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};
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U_BOOT_DRIVER(nvmxip_blk) = {
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.name = NVMXIP_BLKDRV_NAME,
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.id = UCLASS_BLK,
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.probe = nvmxip_blk_probe,
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.ops = &nvmxip_blk_ops,
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};
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