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sandbox: scsi: Move request-handling code to scsi_emul

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Move this code into the emulator file so it can be used by multiple
drivers.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2022-09-21 16:21:45 +02:00
parent 5eff9d9c36
commit 02cea1145a
4 changed files with 109 additions and 77 deletions
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1
drivers/scsi/Makefile
View File

@@ -17,4 +17,5 @@ endif
ifdef CONFIG_SCSI
obj-$(CONFIG_SANDBOX) += sandbox_scsi.o
obj-$(CONFIG_SANDBOX) += scsi_emul.o
endif

74
drivers/scsi/scsi_emul.c Normal file
View File

@@ -0,0 +1,74 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Emulation of enough SCSI commands to find and read from a unit
*
* Copyright 2022 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*
* implementation of SCSI functions required so that CONFIG_SCSI can be enabled
* for sandbox.
*/
#define LOG_CATEGORY UCLASS_SCSI
#include <common.h>
#include <dm.h>
#include <log.h>
#include <scsi.h>
#include <scsi_emul.h>
int sb_scsi_emul_command(struct scsi_emul_info *info,
const struct scsi_cmd *req, int len)
{
int ret = 0;
info->buff_used = 0;
log_debug("emul %x\n", *req->cmd);
switch (*req->cmd) {
case SCSI_INQUIRY: {
struct scsi_inquiry_resp *resp = (void *)info->buff;
info->alloc_len = req->cmd[4];
memset(resp, '\0', sizeof(*resp));
resp->data_format = 1;
resp->additional_len = 0x1f;
strncpy(resp->vendor, info->vendor, sizeof(resp->vendor));
strncpy(resp->product, info->product, sizeof(resp->product));
strncpy(resp->revision, "1.0", sizeof(resp->revision));
info->buff_used = sizeof(*resp);
break;
}
case SCSI_TST_U_RDY:
break;
case SCSI_RD_CAPAC: {
struct scsi_read_capacity_resp *resp = (void *)info->buff;
uint blocks;
if (info->file_size)
blocks = info->file_size / info->block_size - 1;
else
blocks = 0;
resp->last_block_addr = cpu_to_be32(blocks);
resp->block_len = cpu_to_be32(info->block_size);
info->buff_used = sizeof(*resp);
break;
}
case SCSI_READ10: {
const struct scsi_read10_req *read_req = (void *)req;
info->seek_block = be32_to_cpu(read_req->lba);
info->read_len = be16_to_cpu(read_req->xfer_len);
info->buff_used = info->read_len * info->block_size;
ret = SCSI_EMUL_DO_READ;
break;
}
default:
debug("Command not supported: %x\n", req->cmd[0]);
ret = -EPROTONOSUPPORT;
}
if (ret >= 0)
info->phase = info->transfer_len ? SCSIPH_DATA : SCSIPH_STATUS;
log_debug(" - done %x: ret=%d\n", *req->cmd, ret);
return ret;
}