ref: c4ae65b16f802df86318c7f95d32f25be094e6f2
dir: /demos/stm32f429_disco/usb_msc_lwext4.c/
/*
* Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <ext4_config.h>
#include <ext4_blockdev.h>
#include <ext4_errno.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <fcntl.h>
#include <hw_init.h>
#include <usbh_core.h>
#include <usbh_msc.h>
#include <usb_msc_lwext4.h>
extern USBH_HandleTypeDef hUSB_Host;
/**@brief Block size.*/
#define USB_MSC_BLOCK_SIZE 512
/**@brief MBR_block ID*/
#define MBR_BLOCK_ID 0
#define MBR_PART_TABLE_OFF 446
struct part_tab_entry {
uint8_t status;
uint8_t chs1[3];
uint8_t type;
uint8_t chs2[3];
uint32_t first_lba;
uint32_t sectors;
}__attribute__((packed));
/**@brief Partition block offset*/
static uint32_t part_offset;
/**@brief IO timings*/
struct usb_msc_io_timings {
uint64_t acc_bread;
uint64_t acc_bwrite;
uint32_t cnt_bread;
uint32_t cnt_bwrite;
uint32_t av_bread;
uint32_t av_bwrite;
};
static struct usb_msc_io_timings io_timings;
void io_timings_clear(void)
{
memset(&io_timings, 0, sizeof(struct usb_msc_io_timings));
}
const struct ext4_io_stats * io_timings_get(uint32_t time_sum_ms)
{
static struct ext4_io_stats s;
s.io_read = (((float)io_timings.acc_bread * 100.0) / time_sum_ms);
s.io_read /= 1000.0;
s.io_write= (((float)io_timings.acc_bwrite * 100.0) / time_sum_ms);
s.io_write /= 1000.0;
s.cpu = 100.0 - s.io_read - s.io_write;
return &s;
}
/**********************BLOCKDEV INTERFACE**************************************/
static int usb_msc_open(struct ext4_blockdev *bdev);
static int usb_msc_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
uint32_t blk_cnt);
static int usb_msc_bwrite(struct ext4_blockdev *bdev, const void *buf,
uint64_t blk_id, uint32_t blk_cnt);
static int usb_msc_close(struct ext4_blockdev *bdev);
/******************************************************************************/
EXT4_BLOCKDEV_STATIC_INSTANCE(
_usb_msc,
USB_MSC_BLOCK_SIZE,
0,
usb_msc_open,
usb_msc_bread,
usb_msc_bwrite,
usb_msc_close
);
/******************************************************************************/
EXT4_BCACHE_STATIC_INSTANCE(_usb_msc_cache, CONFIG_BLOCK_DEV_CACHE_SIZE, EXT_LOGICAL_BLOCK_SIZE);
/******************************************************************************/
static int usb_msc_open(struct ext4_blockdev *bdev)
{
(void)bdev;
static uint8_t mbr[512];
struct part_tab_entry *part0;
uint8_t status;
if(!hw_usb_connected())
return EIO;
status = USBH_MSC_Read(&hUSB_Host, 0, 0, mbr, 1);
if(status != USBH_OK)
return EIO;
part0 = (struct part_tab_entry *)(mbr + MBR_PART_TABLE_OFF);
MSC_LUNTypeDef lun;
USBH_MSC_GetLUNInfo(&hUSB_Host, 0, &lun);
part_offset = part0->first_lba;
_usb_msc.ph_bcnt = lun.capacity.block_nbr;
return hw_usb_connected() ? EOK : EIO;
}
static int usb_msc_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
uint32_t blk_cnt)
{
uint8_t status;
uint64_t v = tim_get_us();
if(!hw_usb_connected())
return EIO;
while(!USBH_MSC_UnitIsReady(&hUSB_Host, 0))
;
status = USBH_MSC_Read(&hUSB_Host, 0, blk_id + part_offset, buf, blk_cnt);
if(status != USBH_OK)
return EIO;
io_timings.acc_bread += tim_get_us() - v;
io_timings.cnt_bread++;
io_timings.av_bread = io_timings.acc_bread / io_timings.cnt_bread;
return EOK;
}
static int usb_msc_bwrite(struct ext4_blockdev *bdev, const void *buf,
uint64_t blk_id, uint32_t blk_cnt)
{
uint8_t status;
uint64_t v = tim_get_us();
if(!hw_usb_connected())
return EIO;
while(!USBH_MSC_UnitIsReady(&hUSB_Host, 0))
;
status = USBH_MSC_Write(&hUSB_Host, 0, blk_id + part_offset, (void *)buf, blk_cnt);
if(status != USBH_OK)
return EIO;
io_timings.acc_bwrite += tim_get_us() - v;
io_timings.cnt_bwrite++;
io_timings.av_bwrite = io_timings.acc_bwrite / io_timings.cnt_bwrite;
return EOK;
}
static int usb_msc_close(struct ext4_blockdev *bdev)
{
(void)bdev;
return EOK;
}
/******************************************************************************/
struct ext4_bcache* ext4_usb_msc_cache_get(void)
{
return &_usb_msc_cache;
}
struct ext4_blockdev* ext4_usb_msc_get(void)
{
return &_usb_msc;
}