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common/usbx_host_classes/src/ux_host_class_storage_media_read.c
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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Storage Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_storage.h"
#include "ux_host_stack.h"
#if defined(UX_HOST_STANDALONE)
VOID _ux_host_class_storage_read_initialize(UX_HOST_CLASS_STORAGE *storage,
ULONG sector_start, ULONG sector_count);
VOID
#else
static inline VOID
#endif
_ux_host_class_storage_read_initialize(UX_HOST_CLASS_STORAGE *storage,
ULONG sector_start, ULONG sector_count)
{
UCHAR *cbw;
UCHAR *cbw_cb;
ULONG command_length;
/* Use a pointer for the cbw, easier to manipulate. */
cbw = (UCHAR *)storage -> ux_host_class_storage_cbw;
cbw_cb = cbw + UX_HOST_CLASS_STORAGE_CBW_CB;
/* Get the Read Command Length. */
#ifdef UX_HOST_CLASS_STORAGE_INCLUDE_LEGACY_PROTOCOL_SUPPORT
if (storage -> ux_host_class_storage_interface -> ux_interface_descriptor.bInterfaceSubClass ==
UX_HOST_CLASS_STORAGE_SUBCLASS_UFI)
command_length = UX_HOST_CLASS_STORAGE_READ_COMMAND_LENGTH_UFI;
else
command_length = UX_HOST_CLASS_STORAGE_READ_COMMAND_LENGTH_SBC;
#else
command_length = UX_HOST_CLASS_STORAGE_READ_COMMAND_LENGTH_SBC;
#endif
/* Initialize the CBW for this command. */
_ux_host_class_storage_cbw_initialize(storage,
UX_HOST_CLASS_STORAGE_DATA_IN,
sector_count * storage -> ux_host_class_storage_sector_size,
command_length);
/* Prepare the MEDIA READ command block. */
*(cbw_cb + UX_HOST_CLASS_STORAGE_READ_OPERATION) = UX_HOST_CLASS_STORAGE_SCSI_READ16;
/* Store the sector start (LBA field). */
_ux_utility_long_put_big_endian(cbw_cb + UX_HOST_CLASS_STORAGE_READ_LBA, sector_start);
/* Store the number of sectors to read. */
_ux_utility_short_put_big_endian(cbw_cb + UX_HOST_CLASS_STORAGE_READ_TRANSFER_LENGTH, (USHORT) sector_count);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_storage_media_read PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function will read one or more logical sector from the media. */
/* */
/* INPUT */
/* */
/* storage Pointer to storage class */
/* sector_start Starting sector */
/* sector_count Number of sectors to read */
/* data_pointer Pointer to data to read */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_storage_cbw_initialize Initialize the CBW */
/* _ux_host_class_storage_transport Send command */
/* _ux_utility_long_put_big_endian Put 32-bit word */
/* _ux_utility_short_put_big_endian Put 16-bit word */
/* */
/* CALLED BY */
/* */
/* Storage Class */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* resulting in version 6.1 */
/* 01-31-2022 Chaoqiong Xiao Modified comment(s), */
/* added standalone support, */
/* resulting in version 6.1.10 */
/* */
/**************************************************************************/
UINT _ux_host_class_storage_media_read(UX_HOST_CLASS_STORAGE *storage, ULONG sector_start,
ULONG sector_count, UCHAR *data_pointer)
{
#if defined(UX_HOST_STANDALONE)
UINT status;
do {
status = _ux_host_class_storage_read_write_run(storage, UX_TRUE,
sector_start, sector_count, data_pointer);
} while(status == UX_STATE_WAIT);
return(storage -> ux_host_class_storage_status);
#else
UINT status;
UINT media_retry;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_STORAGE_MEDIA_READ, storage, sector_start, sector_count, data_pointer, UX_TRACE_HOST_CLASS_EVENTS, 0, 0)
/* Reset the retry count. */
media_retry = UX_HOST_CLASS_STORAGE_REQUEST_SENSE_RETRY;
/* We may need several attempts. */
while (media_retry-- != 0)
{
/* Initialize CBW. */
_ux_host_class_storage_read_initialize(storage, sector_start, sector_count);
/* Send the command to transport layer. */
status = _ux_host_class_storage_transport(storage, data_pointer);
if (status != UX_SUCCESS)
return(status);
/* Did the command succeed? */
if (storage -> ux_host_class_storage_sense_code == UX_SUCCESS)
{
/* Check for completeness of sector read. */
if (storage -> ux_host_class_storage_data_phase_length != sector_count * storage -> ux_host_class_storage_sector_size)
{
/* This can happen if the device sent less data than the host
requested. This does not fit our definition of success and
retrying shouldn't change the outcome, so we return an error. */
/* We got an error during read. Packet not complete. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_TRANSFER_DATA_LESS_THAN_EXPECTED);
/* Return to UX_MEDIA (default FileX). */
return(UX_ERROR);
}
/* The read succeeded. */
return(UX_SUCCESS);
}
/* The command did not succeed. Retry. */
}
/* Check if the media in the device has been removed. If so
we have to tell UX_MEDIA (default FileX) that the media is closed. */
return(UX_HOST_CLASS_STORAGE_SENSE_ERROR);
#endif
}