84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Emulation of enough SCSI commands to find and read from a unit
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*
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* Copyright 2022 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*
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* implementation of SCSI functions required so that CONFIG_SCSI can be enabled
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* for sandbox.
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*/
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#define LOG_CATEGORY UCLASS_SCSI
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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 <scsi.h>
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#include <scsi_emul.h>
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int sb_scsi_emul_command(struct scsi_emul_info *info,
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const struct scsi_cmd *req, int len)
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{
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int ret = 0;
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info->buff_used = 0;
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log_debug("emul %x\n", *req->cmd);
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switch (*req->cmd) {
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case SCSI_INQUIRY: {
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struct scsi_inquiry_resp *resp = (void *)info->buff;
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info->alloc_len = req->cmd[4];
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memset(resp, '\0', sizeof(*resp));
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resp->data_format = 1;
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resp->additional_len = 0x1f;
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strncpy(resp->vendor, info->vendor, sizeof(resp->vendor));
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strncpy(resp->product, info->product, sizeof(resp->product));
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strncpy(resp->revision, "1.0", sizeof(resp->revision));
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info->buff_used = sizeof(*resp);
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break;
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}
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case SCSI_TST_U_RDY:
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break;
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case SCSI_RD_CAPAC: {
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struct scsi_read_capacity_resp *resp = (void *)info->buff;
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uint blocks;
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if (info->file_size)
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blocks = info->file_size / info->block_size - 1;
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else
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blocks = 0;
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resp->last_block_addr = cpu_to_be32(blocks);
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resp->block_len = cpu_to_be32(info->block_size);
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info->buff_used = sizeof(*resp);
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break;
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}
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case SCSI_READ10: {
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const struct scsi_read10_req *read_req = (void *)req;
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info->seek_block = be32_to_cpu(read_req->lba);
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info->read_len = be16_to_cpu(read_req->xfer_len);
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info->buff_used = info->read_len * info->block_size;
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ret = SCSI_EMUL_DO_READ;
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break;
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}
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case SCSI_WRITE10: {
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const struct scsi_write10_req *write_req = (void *)req;
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info->seek_block = be32_to_cpu(write_req->lba);
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info->write_len = be16_to_cpu(write_req->xfer_len);
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info->buff_used = info->write_len * info->block_size;
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ret = SCSI_EMUL_DO_WRITE;
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break;
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}
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default:
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debug("Command not supported: %x\n", req->cmd[0]);
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ret = -EPROTONOSUPPORT;
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}
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if (ret >= 0)
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info->phase = info->transfer_len ? SCSIPH_DATA : SCSIPH_STATUS;
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log_debug(" - done %x: ret=%d\n", *req->cmd, ret);
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return ret;
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}
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