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rockbox/firmware/usbstack/usb_storage.c
Amaury Pouly 27c7e477ca Revert "usb_storage: make it a bit more correct" 
Clearly this was a stupid commit, no idea why I did that.

This reverts commit 074e911859.
2015-02-16 14:06:28 +01:00

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Björn Stenberg
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "string.h"
#include "system.h"
#include "usb_core.h"
#include "usb_drv.h"
#include "usb_class_driver.h"
/*#define LOGF_ENABLE*/
#include "logf.h"
#include "storage.h"
#include "disk.h"
#include "fat.h"
/* Needed to get at the audio buffer */
#include "audio.h"
#include "usb_storage.h"
#if CONFIG_RTC
#include "timefuncs.h"
#endif
#include "core_alloc.h"
#include "panic.h"
#ifdef USB_USE_RAMDISK
#define RAMDISK_SIZE 2048
#endif
#ifndef SECTOR_SIZE
#define SECTOR_SIZE 512
#endif
/* These defaults allow the operation */
#ifndef USBSTOR_READ_SECTORS_FILTER
#define USBSTOR_READ_SECTORS_FILTER() ({ 0; })
#endif
#ifndef USBSTOR_WRITE_SECTORS_FILTER
#define USBSTOR_WRITE_SECTORS_FILTER() ({ 0; })
#endif
/* the ARC driver currently supports up to 64k USB transfers. This is
* enough for efficient mass storage support, as commonly host OSes
* don't do larger SCSI transfers anyway, so larger USB transfers
* wouldn't buy us anything.
* Due to being the double-buffering system used, using a smaller write buffer
* ends up being more efficient. Measurements have shown that 24k to 28k is
* optimal, except for sd devices that apparently don't gain anything from
* double-buffering
*/
#ifdef USB_READ_BUFFER_SIZE
#define READ_BUFFER_SIZE USB_READ_BUFFER_SIZE
#else
#if CONFIG_USBOTG == USBOTG_AS3525
/* We'd need to implement multidescriptor dma for sizes >65535 */
#define READ_BUFFER_SIZE (1024*63)
#else
#define READ_BUFFER_SIZE (1024*64)
#endif /* CONFIG_CPU == AS3525 */
#endif /* USB_READ_BUFFER_SIZE */
/* We don't use sizeof() here, because we *need* a multiple of 32 */
#define MAX_CBW_SIZE 32
#ifdef USB_WRITE_BUFFER_SIZE
#define WRITE_BUFFER_SIZE USB_WRITE_BUFFER_SIZE
#else
#if (CONFIG_STORAGE & STORAGE_SD)
#if CONFIG_USBOTG == USBOTG_AS3525
/* We'd need to implement multidescriptor dma for sizes >65535 */
#define WRITE_BUFFER_SIZE (1024*63)
#else
#define WRITE_BUFFER_SIZE (1024*64)
#endif /* CONFIG_CPU == AS3525 */
#else
#define WRITE_BUFFER_SIZE (1024*24)
#endif /* (CONFIG_STORAGE & STORAGE_SD) */
#endif /* USB_WRITE_BUFFER_SIZE */
#define ALLOCATE_BUFFER_SIZE (2*MAX(READ_BUFFER_SIZE,WRITE_BUFFER_SIZE))
/* bulk-only class specific requests */
#define USB_BULK_RESET_REQUEST 0xff
#define USB_BULK_GET_MAX_LUN 0xfe
#define DIRECT_ACCESS_DEVICE 0x00 /* disks */
#define DEVICE_REMOVABLE 0x80
#define CBW_SIGNATURE 0x43425355
#define CSW_SIGNATURE 0x53425355
#define SCSI_TEST_UNIT_READY 0x00
#define SCSI_INQUIRY 0x12
#define SCSI_MODE_SENSE_6 0x1a
#define SCSI_MODE_SENSE_10 0x5a
#define SCSI_REQUEST_SENSE 0x03
#define SCSI_ALLOW_MEDIUM_REMOVAL 0x1e
#define SCSI_READ_CAPACITY 0x25
#define SCSI_READ_FORMAT_CAPACITY 0x23
#define SCSI_READ_10 0x28
#define SCSI_WRITE_10 0x2a
#define SCSI_START_STOP_UNIT 0x1b
#define SCSI_REPORT_LUNS 0xa0
#define SCSI_WRITE_BUFFER 0x3b
#define UMS_STATUS_GOOD 0x00
#define UMS_STATUS_FAIL 0x01
#define SENSE_NOT_READY 0x02
#define SENSE_MEDIUM_ERROR 0x03
#define SENSE_ILLEGAL_REQUEST 0x05
#define SENSE_UNIT_ATTENTION 0x06
#define ASC_MEDIUM_NOT_PRESENT 0x3a
#define ASC_INVALID_FIELD_IN_CBD 0x24
#define ASC_LBA_OUT_OF_RANGE 0x21
#define ASC_WRITE_ERROR 0x0C
#define ASC_READ_ERROR 0x11
#define ASC_NOT_READY 0x04
#define ASC_INVALID_COMMAND 0x20
#define ASCQ_BECOMING_READY 0x01
#define SCSI_FORMAT_CAPACITY_FORMATTED_MEDIA 0x02000000
/* storage interface */
#define USB_SC_SCSI 0x06 /* Transparent */
#define USB_PROT_BULK 0x50 /* bulk only */
static struct usb_interface_descriptor __attribute__((aligned(2)))
interface_descriptor =
{
.bLength = sizeof(struct usb_interface_descriptor),
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0,
.bAlternateSetting = 0,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_MASS_STORAGE,
.bInterfaceSubClass = USB_SC_SCSI,
.bInterfaceProtocol = USB_PROT_BULK,
.iInterface = 0
};
static struct usb_endpoint_descriptor __attribute__((aligned(2)))
endpoint_descriptor =
{
.bLength = sizeof(struct usb_endpoint_descriptor),
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 0,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 0,
.bInterval = 0
};
struct inquiry_data {
unsigned char DeviceType;
unsigned char DeviceTypeModifier;
unsigned char Versions;
unsigned char Format;
unsigned char AdditionalLength;
unsigned char Reserved[2];
unsigned char Capability;
unsigned char VendorId[8];
unsigned char ProductId[16];
unsigned char ProductRevisionLevel[4];
} __attribute__ ((packed));
struct report_lun_data {
unsigned int lun_list_length;
unsigned int reserved1;
unsigned char luns[NUM_DRIVES][8];
} __attribute__ ((packed));
struct sense_data {
unsigned char ResponseCode;
unsigned char Obsolete;
unsigned char fei_sensekey;
unsigned int Information;
unsigned char AdditionalSenseLength;
unsigned int CommandSpecificInformation;
unsigned char AdditionalSenseCode;
unsigned char AdditionalSenseCodeQualifier;
unsigned char FieldReplaceableUnitCode;
unsigned char SKSV;
unsigned short SenseKeySpecific;
} __attribute__ ((packed));
struct mode_sense_bdesc_longlba {
unsigned char num_blocks[8];
unsigned char reserved[4];
unsigned char block_size[4];
} __attribute__ ((packed));
struct mode_sense_bdesc_shortlba {
unsigned char density_code;
unsigned char num_blocks[3];
unsigned char reserved;
unsigned char block_size[3];
} __attribute__ ((packed));
struct mode_sense_data_10 {
unsigned short mode_data_length;
unsigned char medium_type;
unsigned char device_specific;
unsigned char longlba;
unsigned char reserved;
unsigned short block_descriptor_length;
struct mode_sense_bdesc_longlba block_descriptor;
} __attribute__ ((packed));
struct mode_sense_data_6 {
unsigned char mode_data_length;
unsigned char medium_type;
unsigned char device_specific;
unsigned char block_descriptor_length;
struct mode_sense_bdesc_shortlba block_descriptor;
} __attribute__ ((packed));
struct command_block_wrapper {
unsigned int signature;
unsigned int tag;
unsigned int data_transfer_length;
unsigned char flags;
unsigned char lun;
unsigned char command_length;
unsigned char command_block[16];
} __attribute__ ((packed));
struct command_status_wrapper {
unsigned int signature;
unsigned int tag;
unsigned int data_residue;
unsigned char status;
} __attribute__ ((packed));
struct capacity {
unsigned int block_count;
unsigned int block_size;
} __attribute__ ((packed));
struct format_capacity {
unsigned int following_length;
unsigned int block_count;
unsigned int block_size;
} __attribute__ ((packed));
static union {
unsigned char* transfer_buffer;
struct inquiry_data* inquiry;
struct capacity* capacity_data;
struct format_capacity* format_capacity_data;
struct sense_data *sense_data;
struct mode_sense_data_6 *ms_data_6;
struct mode_sense_data_10 *ms_data_10;
struct report_lun_data *lun_data;
struct command_status_wrapper* csw;
char *max_lun;
} tb;
static char *cbw_buffer;
static struct {
unsigned int sector;
unsigned int count;
unsigned int orig_count;
unsigned int cur_cmd;
unsigned int tag;
unsigned int lun;
unsigned char *data[2];
unsigned char data_select;
unsigned int last_result;
} cur_cmd;
static struct {
unsigned char sense_key;
unsigned char information;
unsigned char asc;
unsigned char ascq;
} cur_sense_data;
static void handle_scsi(struct command_block_wrapper* cbw);
static void send_csw(int status);
static void send_command_result(void *data,int size);
static void send_command_failed_result(void);
static void send_block_data(void *data,int size);
static void receive_block_data(void *data,int size);
#if CONFIG_RTC
static void receive_time(void);
#endif
static void fill_inquiry(IF_MD_NONVOID(int lun));
static void send_and_read_next(void);
static bool ejected[NUM_DRIVES];
static bool locked[NUM_DRIVES];
static int usb_interface;
static int ep_in, ep_out;
#if defined(HAVE_MULTIDRIVE)
static bool skip_first = 0;
#endif
#ifdef USB_USE_RAMDISK
static unsigned char* ramdisk_buffer;
#endif
static enum {
WAITING_FOR_COMMAND,
SENDING_BLOCKS,
SENDING_RESULT,
SENDING_FAILED_RESULT,
RECEIVING_BLOCKS,
#if CONFIG_RTC
RECEIVING_TIME,
#endif
WAITING_FOR_CSW_COMPLETION_OR_COMMAND,
WAITING_FOR_CSW_COMPLETION
} state = WAITING_FOR_COMMAND;
#if CONFIG_RTC
static void yearday_to_daymonth(int yd, int y, int *d, int *m)
{
static char t[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
bool leap = (y%4 == 0 && y%100 != 0) || y%400 == 0;
t[1] = leap ? 29 : 28;
int i;
for (i = 0; i < 12 && yd >= t[i]; i++)
yd -= t[i];
*d = yd+1;
*m = i;
}
#endif /* CONFIG_RTC */
static bool check_disk_present(IF_MD_NONVOID(int volume))
{
#ifdef USB_USE_RAMDISK
return true;
#else
return disk_present(IF_MD(volume));
#endif
}
#ifdef HAVE_HOTSWAP
void usb_storage_notify_hotswap(int volume,bool inserted)
{
logf("notify %d",inserted);
if(inserted && check_disk_present(IF_MD(volume))) {
ejected[volume] = false;
}
else {
ejected[volume] = true;
/* If this happens while the device is locked, weird things may happen.
At least try to keep our state consistent */
locked[volume]=false;
}
}
#endif
#ifdef HAVE_MULTIDRIVE
void usb_set_skip_first_drive(bool skip)
{
skip_first = skip;
}
#endif
/* called by usb_core_init() */
void usb_storage_init(void)
{
logf("usb_storage_init done");
}
int usb_storage_request_endpoints(struct usb_class_driver *drv)
{
ep_in = usb_core_request_endpoint(USB_ENDPOINT_XFER_BULK, USB_DIR_IN, drv);
if(ep_in<0)
return -1;
ep_out = usb_core_request_endpoint(USB_ENDPOINT_XFER_BULK, USB_DIR_OUT,
drv);
if(ep_out<0) {
usb_core_release_endpoint(ep_in);
return -1;
}
return 0;
}
int usb_storage_set_first_interface(int interface)
{
usb_interface = interface;
return interface + 1;
}
int usb_storage_get_config_descriptor(unsigned char *dest,int max_packet_size)
{
unsigned char *orig_dest = dest;
interface_descriptor.bInterfaceNumber = usb_interface;
PACK_DATA(&dest, interface_descriptor);
endpoint_descriptor.wMaxPacketSize = max_packet_size;
endpoint_descriptor.bEndpointAddress = ep_in;
PACK_DATA(&dest, endpoint_descriptor);
endpoint_descriptor.bEndpointAddress = ep_out;
PACK_DATA(&dest, endpoint_descriptor);
return (dest - orig_dest);
}
static int usb_handle;
void usb_storage_init_connection(void)
{
logf("ums: set config");
/* prime rx endpoint. We only need room for commands */
state = WAITING_FOR_COMMAND;
#if (CONFIG_CPU == IMX31L || defined(CPU_TCC77X) || defined(CPU_TCC780X) || \
defined(BOOTLOADER) || CONFIG_CPU == DM320) && !defined(CPU_PP502x)
static unsigned char _cbw_buffer[MAX_CBW_SIZE]
USB_DEVBSS_ATTR __attribute__((aligned(32)));
cbw_buffer = (void *)_cbw_buffer;
static unsigned char _transfer_buffer[ALLOCATE_BUFFER_SIZE]
USB_DEVBSS_ATTR __attribute__((aligned(32)));
tb.transfer_buffer = (void *)_transfer_buffer;
#ifdef USB_USE_RAMDISK
static unsigned char _ramdisk_buffer[RAMDISK_SIZE*SECTOR_SIZE];
ramdisk_buffer = _ramdisk_buffer;
#endif
#else
unsigned char * buffer;
/* dummy ops with no callbacks, needed because by
* default buflib buffers can be moved around which must be avoided */
static struct buflib_callbacks dummy_ops;
// Add 31 to handle worst-case misalignment
usb_handle = core_alloc_ex("usb storage", ALLOCATE_BUFFER_SIZE + MAX_CBW_SIZE + 31, &dummy_ops);
if (usb_handle < 0)
panicf("%s(): OOM", __func__);
buffer = core_get_data(usb_handle);
#if defined(UNCACHED_ADDR) && CONFIG_CPU != AS3525
cbw_buffer = (void *)UNCACHED_ADDR((unsigned int)(buffer+31) & 0xffffffe0);
#else
cbw_buffer = (void *)((unsigned int)(buffer+31) & 0xffffffe0);
#endif
tb.transfer_buffer = cbw_buffer + MAX_CBW_SIZE;
commit_discard_dcache();
#ifdef USB_USE_RAMDISK
ramdisk_buffer = tb.transfer_buffer + ALLOCATE_BUFFER_SIZE;
#endif
#endif
usb_drv_recv(ep_out, cbw_buffer, MAX_CBW_SIZE);
int i;
for(i=0;i<storage_num_drives();i++) {
locked[i] = false;
ejected[i] = !check_disk_present(IF_MD(i));
queue_broadcast(SYS_USB_LUN_LOCKED, (i<<16)+0);
}
}
void usb_storage_disconnect(void)
{
if (usb_handle > 0)
usb_handle = core_free(usb_handle);
}
/* called by usb_core_transfer_complete() */
void usb_storage_transfer_complete(int ep,int dir,int status,int length)
{
(void)ep;
struct command_block_wrapper* cbw = (void*)cbw_buffer;
#if CONFIG_RTC
struct tm tm;
#endif
logf("transfer result for ep %d/%d %X %d", ep,dir,status, length);
switch(state) {
case RECEIVING_BLOCKS:
if(dir==USB_DIR_IN) {
logf("IN received in RECEIVING");
}
logf("scsi write %d %d", cur_cmd.sector, cur_cmd.count);
if(status==0) {
if((unsigned int)length!=(SECTOR_SIZE* cur_cmd.count)
&& (unsigned int)length!=WRITE_BUFFER_SIZE) {
logf("unexpected length :%d",length);
break;
}
unsigned int next_sector = cur_cmd.sector +
(WRITE_BUFFER_SIZE/SECTOR_SIZE);
unsigned int next_count = cur_cmd.count -
MIN(cur_cmd.count,WRITE_BUFFER_SIZE/SECTOR_SIZE);
int next_select = !cur_cmd.data_select;
if(next_count!=0) {
/* Ask the host to send more, to the other buffer */
receive_block_data(cur_cmd.data[next_select],
MIN(WRITE_BUFFER_SIZE,next_count*SECTOR_SIZE));
}
/* Now write the data that just came in, while the host is
sending the next bit */
#ifdef USB_USE_RAMDISK
memcpy(ramdisk_buffer + cur_cmd.sector*SECTOR_SIZE,
cur_cmd.data[cur_cmd.data_select],
MIN(WRITE_BUFFER_SIZE/SECTOR_SIZE, cur_cmd.count)*SECTOR_SIZE);
#else
int result = USBSTOR_WRITE_SECTORS_FILTER();
if (result == 0) {
result = storage_write_sectors(IF_MD(cur_cmd.lun,)
cur_cmd.sector,
MIN(WRITE_BUFFER_SIZE/SECTOR_SIZE, cur_cmd.count),
cur_cmd.data[cur_cmd.data_select]);
}
if(result != 0) {
send_csw(UMS_STATUS_FAIL);
cur_sense_data.sense_key=SENSE_MEDIUM_ERROR;
cur_sense_data.asc=ASC_WRITE_ERROR;
cur_sense_data.ascq=0;
break;
}
#endif
if(next_count==0) {
send_csw(UMS_STATUS_GOOD);
}
/* Switch buffers for the next one */
cur_cmd.data_select=!cur_cmd.data_select;
cur_cmd.sector = next_sector;
cur_cmd.count = next_count;
}
else {
logf("Transfer failed %X",status);
send_csw(UMS_STATUS_FAIL);
/* TODO fill in cur_sense_data */
cur_sense_data.sense_key=0;
cur_sense_data.information=0;
cur_sense_data.asc=0;
cur_sense_data.ascq=0;
}
break;
case WAITING_FOR_CSW_COMPLETION_OR_COMMAND:
if(dir==USB_DIR_IN) {
/* This was the CSW */
state = WAITING_FOR_COMMAND;
}
else {
/* This was the command */
state = WAITING_FOR_CSW_COMPLETION;
/* We now have the CBW, but we won't execute it yet to avoid
* issues with the still-pending CSW */
}
break;
case WAITING_FOR_COMMAND:
if(dir==USB_DIR_IN) {
logf("IN received in WAITING_FOR_COMMAND");
}
handle_scsi(cbw);
break;
case WAITING_FOR_CSW_COMPLETION:
if(dir==USB_DIR_OUT) {
logf("OUT received in WAITING_FOR_CSW_COMPLETION");
}
handle_scsi(cbw);
break;
#if 0
if(cur_cmd.cur_cmd == SCSI_WRITE_10)
{
queue_broadcast(SYS_USB_WRITE_DATA, (cur_cmd.lun<<16)+cur_cmd.orig_count);
}
else if(cur_cmd.cur_cmd == SCSI_READ_10)
{
queue_broadcast(SYS_USB_READ_DATA, (cur_cmd.lun<<16)+cur_cmd.orig_count);
}
#endif
break;
case SENDING_RESULT:
if(dir==USB_DIR_OUT) {
logf("OUT received in SENDING");
}
if(status==0) {
//logf("data sent, now send csw");
send_csw(UMS_STATUS_GOOD);
}
else {
logf("Transfer failed %X",status);
send_csw(UMS_STATUS_FAIL);
/* TODO fill in cur_sense_data */
cur_sense_data.sense_key=0;
cur_sense_data.information=0;
cur_sense_data.asc=0;
cur_sense_data.ascq=0;
}
break;
case SENDING_FAILED_RESULT:
if(dir==USB_DIR_OUT) {
logf("OUT received in SENDING");
}
send_csw(UMS_STATUS_FAIL);
break;
case SENDING_BLOCKS:
if(dir==USB_DIR_OUT) {
logf("OUT received in SENDING");
}
if(status==0) {
if(cur_cmd.count==0) {
//logf("data sent, now send csw");
if(cur_cmd.last_result!=0) {
/* The last read failed. */
send_csw(UMS_STATUS_FAIL);
cur_sense_data.sense_key=SENSE_MEDIUM_ERROR;
cur_sense_data.asc=ASC_READ_ERROR;
cur_sense_data.ascq=0;
return;
}
else
send_csw(UMS_STATUS_GOOD);
}
else {
send_and_read_next();
}
}
else {
logf("Transfer failed %X",status);
send_csw(UMS_STATUS_FAIL);
/* TODO fill in cur_sense_data */
cur_sense_data.sense_key=0;
cur_sense_data.information=0;
cur_sense_data.asc=0;
cur_sense_data.ascq=0;
}
break;
#if CONFIG_RTC
case RECEIVING_TIME:
tm.tm_year=(tb.transfer_buffer[0]<<8)+tb.transfer_buffer[1] - 1900;
tm.tm_yday=(tb.transfer_buffer[2]<<8)+tb.transfer_buffer[3];
tm.tm_hour=tb.transfer_buffer[5];
tm.tm_min=tb.transfer_buffer[6];
tm.tm_sec=tb.transfer_buffer[7];
yearday_to_daymonth(tm.tm_yday,tm.tm_year + 1900,&tm.tm_mday,&tm.tm_mon);
set_day_of_week(&tm);
set_time(&tm);
send_csw(UMS_STATUS_GOOD);
break;
#endif /* CONFIG_RTC */
}
}
/* called by usb_core_control_request() */
bool usb_storage_control_request(struct usb_ctrlrequest* req, unsigned char* dest)
{
bool handled = false;
(void)dest;
switch (req->bRequest) {
case USB_BULK_GET_MAX_LUN: {
*tb.max_lun = storage_num_drives() - 1;
#if defined(HAVE_MULTIDRIVE)
if(skip_first) (*tb.max_lun) --;
#endif
logf("ums: getmaxlun");
usb_drv_recv(EP_CONTROL, NULL, 0); /* ack */
usb_drv_send(EP_CONTROL, tb.max_lun, 1);
handled = true;
break;
}
case USB_BULK_RESET_REQUEST:
logf("ums: bulk reset");
state = WAITING_FOR_COMMAND;
/* UMS BOT 3.1 says The device shall preserve the value of its bulk
data toggle bits and endpoint STALL conditions despite
the Bulk-Only Mass Storage Reset. */
#if 0
usb_drv_reset_endpoint(ep_in, false);
usb_drv_reset_endpoint(ep_out, true);
#endif
usb_drv_send(EP_CONTROL, NULL, 0); /* ack */
handled = true;
break;
}
return handled;
}
static void send_and_read_next(void)
{
int result = USBSTOR_READ_SECTORS_FILTER();
if(result != 0 && cur_cmd.last_result == 0)
cur_cmd.last_result = result;
send_block_data(cur_cmd.data[cur_cmd.data_select],
MIN(READ_BUFFER_SIZE,cur_cmd.count*SECTOR_SIZE));
/* Switch buffers for the next one */
cur_cmd.data_select=!cur_cmd.data_select;
cur_cmd.sector+=(READ_BUFFER_SIZE/SECTOR_SIZE);
cur_cmd.count-=MIN(cur_cmd.count,READ_BUFFER_SIZE/SECTOR_SIZE);
if(cur_cmd.count!=0) {
/* already read the next bit, so we can send it out immediately when the
* current transfer completes. */
#ifdef USB_USE_RAMDISK
memcpy(cur_cmd.data[cur_cmd.data_select],
ramdisk_buffer + cur_cmd.sector*SECTOR_SIZE,
MIN(READ_BUFFER_SIZE/SECTOR_SIZE, cur_cmd.count)*SECTOR_SIZE);
#else
result = storage_read_sectors(IF_MD(cur_cmd.lun,)
cur_cmd.sector,
MIN(READ_BUFFER_SIZE/SECTOR_SIZE, cur_cmd.count),
cur_cmd.data[cur_cmd.data_select]);
if(cur_cmd.last_result == 0)
cur_cmd.last_result = result;
#endif
}
}
/****************************************************************************/
static void handle_scsi(struct command_block_wrapper* cbw)
{
/* USB Mass Storage assumes LBA capability.
TODO: support 48-bit LBA */
struct storage_info info;
unsigned int length = cbw->data_transfer_length;
unsigned int block_size, block_count;
bool lun_present=true;
unsigned char lun = cbw->lun;
unsigned int block_size_mult = 1;
if(letoh32(cbw->signature) != CBW_SIGNATURE) {
logf("ums: bad cbw signature (%x)", cbw->signature);
usb_drv_stall(ep_in, true,true);
usb_drv_stall(ep_out, true,false);
return;
}
/* Clear the signature to prevent possible bugs elsewhere
* to trigger a second execution of the same command with
* bogus data */
cbw->signature=0;
#if defined(HAVE_MULTIDRIVE)
if(skip_first) lun++;
#endif
storage_get_info(lun,&info);
#ifdef USB_USE_RAMDISK
block_size = SECTOR_SIZE;
block_count = RAMDISK_SIZE;
#else
block_size=info.sector_size;
block_count=info.num_sectors;
#endif
#ifdef HAVE_HOTSWAP
if(storage_removable(lun) && !storage_present(lun)) {
ejected[lun] = true;
}
#endif
if(ejected[lun])
lun_present = false;
#ifdef MAX_LOG_SECTOR_SIZE
block_size_mult = disk_get_sector_multiplier(IF_MD(lun));
#endif
cur_cmd.tag = cbw->tag;
cur_cmd.lun = lun;
cur_cmd.cur_cmd = cbw->command_block[0];
switch (cbw->command_block[0]) {
case SCSI_TEST_UNIT_READY:
logf("scsi test_unit_ready %d",lun);
if(!usb_exclusive_storage()) {
send_csw(UMS_STATUS_FAIL);
cur_sense_data.sense_key=SENSE_NOT_READY;
cur_sense_data.asc=ASC_MEDIUM_NOT_PRESENT;
cur_sense_data.ascq=0;
break;
}
if(lun_present) {
send_csw(UMS_STATUS_GOOD);
}
else {
send_csw(UMS_STATUS_FAIL);
cur_sense_data.sense_key=SENSE_NOT_READY;
cur_sense_data.asc=ASC_MEDIUM_NOT_PRESENT;
cur_sense_data.ascq=0;
}
break;
case SCSI_REPORT_LUNS: {
logf("scsi report luns %d",lun);
unsigned int allocation_length=0;
int i;
unsigned int response_length = 8+8*storage_num_drives();
allocation_length|=(cbw->command_block[6]<<24);
allocation_length|=(cbw->command_block[7]<<16);
allocation_length|=(cbw->command_block[8]<<8);
allocation_length|=(cbw->command_block[9]);
memset(tb.lun_data,0,sizeof(struct report_lun_data));
tb.lun_data->lun_list_length=htobe32(8*storage_num_drives());
for(i=0;i<storage_num_drives();i++)
{
#ifdef HAVE_HOTSWAP
if(storage_removable(i))
tb.lun_data->luns[i][1]=1;
else
#endif
tb.lun_data->luns[i][1]=0;
}
length = MIN(length, allocation_length);
send_command_result(tb.lun_data,
MIN(response_length, length));
break;
}
case SCSI_INQUIRY:
logf("scsi inquiry %d",lun);
fill_inquiry(IF_MD(lun));
length = MIN(length, cbw->command_block[4]);
send_command_result(tb.inquiry,
MIN(sizeof(struct inquiry_data), length));
break;
case SCSI_REQUEST_SENSE: {
tb.sense_data->ResponseCode=0x70;/*current error*/
tb.sense_data->Obsolete=0;
tb.sense_data->fei_sensekey=cur_sense_data.sense_key&0x0f;
tb.sense_data->Information=cur_sense_data.information;
tb.sense_data->AdditionalSenseLength=10;
tb.sense_data->CommandSpecificInformation=0;
tb.sense_data->AdditionalSenseCode=cur_sense_data.asc;
tb.sense_data->AdditionalSenseCodeQualifier=cur_sense_data.ascq;
tb.sense_data->FieldReplaceableUnitCode=0;
tb.sense_data->SKSV=0;
tb.sense_data->SenseKeySpecific=0;
logf("scsi request_sense %d",lun);
send_command_result(tb.sense_data,
MIN(sizeof(struct sense_data), length));
break;
}
case SCSI_MODE_SENSE_10: {
if(!lun_present) {
send_command_failed_result();
cur_sense_data.sense_key=SENSE_NOT_READY;
cur_sense_data.asc=ASC_MEDIUM_NOT_PRESENT;
cur_sense_data.ascq=0;
break;
}
/*unsigned char pc = (cbw->command_block[2] & 0xc0) >>6;*/
unsigned char page_code = cbw->command_block[2] & 0x3f;
logf("scsi mode_sense_10 %d %X",lun,page_code);
switch(page_code) {
case 0x3f:
tb.ms_data_10->mode_data_length =
htobe16(sizeof(struct mode_sense_data_10)-2);
tb.ms_data_10->medium_type = 0;
tb.ms_data_10->device_specific = 0;
tb.ms_data_10->reserved = 0;
tb.ms_data_10->longlba = 1;
tb.ms_data_10->block_descriptor_length =
htobe16(sizeof(struct mode_sense_bdesc_longlba));
memset(tb.ms_data_10->block_descriptor.reserved,0,4);
memset(tb.ms_data_10->block_descriptor.num_blocks,0,8);
tb.ms_data_10->block_descriptor.num_blocks[4] =
((block_count/block_size_mult) & 0xff000000)>>24;
tb.ms_data_10->block_descriptor.num_blocks[5] =
((block_count/block_size_mult) & 0x00ff0000)>>16;
tb.ms_data_10->block_descriptor.num_blocks[6] =
((block_count/block_size_mult) & 0x0000ff00)>>8;
tb.ms_data_10->block_descriptor.num_blocks[7] =
((block_count/block_size_mult) & 0x000000ff);
tb.ms_data_10->block_descriptor.block_size[0] =
((block_size*block_size_mult) & 0xff000000)>>24;
tb.ms_data_10->block_descriptor.block_size[1] =
((block_size*block_size_mult) & 0x00ff0000)>>16;
tb.ms_data_10->block_descriptor.block_size[2] =
((block_size*block_size_mult) & 0x0000ff00)>>8;
tb.ms_data_10->block_descriptor.block_size[3] =
((block_size*block_size_mult) & 0x000000ff);
send_command_result(tb.ms_data_10,
MIN(sizeof(struct mode_sense_data_10), length));
break;
default:
send_command_failed_result();
cur_sense_data.sense_key=SENSE_ILLEGAL_REQUEST;
cur_sense_data.asc=ASC_INVALID_FIELD_IN_CBD;
cur_sense_data.ascq=0;
break;
}
break;
}
case SCSI_MODE_SENSE_6: {
if(!lun_present) {
send_command_failed_result();
cur_sense_data.sense_key=SENSE_NOT_READY;
cur_sense_data.asc=ASC_MEDIUM_NOT_PRESENT;
cur_sense_data.ascq=0;
break;
}
/*unsigned char pc = (cbw->command_block[2] & 0xc0) >>6;*/
unsigned char page_code = cbw->command_block[2] & 0x3f;
logf("scsi mode_sense_6 %d %X",lun,page_code);
switch(page_code) {
case 0x3f:
/* All supported pages. */
tb.ms_data_6->mode_data_length =
sizeof(struct mode_sense_data_6)-1;
tb.ms_data_6->medium_type = 0;
tb.ms_data_6->device_specific = 0;
tb.ms_data_6->block_descriptor_length =
sizeof(struct mode_sense_bdesc_shortlba);
tb.ms_data_6->block_descriptor.density_code = 0;
tb.ms_data_6->block_descriptor.reserved = 0;
if(block_count/block_size_mult > 0xffffff) {
tb.ms_data_6->block_descriptor.num_blocks[0] = 0xff;
tb.ms_data_6->block_descriptor.num_blocks[1] = 0xff;
tb.ms_data_6->block_descriptor.num_blocks[2] = 0xff;
}
else {
tb.ms_data_6->block_descriptor.num_blocks[0] =
((block_count/block_size_mult) & 0xff0000)>>16;
tb.ms_data_6->block_descriptor.num_blocks[1] =
((block_count/block_size_mult) & 0x00ff00)>>8;
tb.ms_data_6->block_descriptor.num_blocks[2] =
((block_count/block_size_mult) & 0x0000ff);
}
tb.ms_data_6->block_descriptor.block_size[0] =
((block_size*block_size_mult) & 0xff0000)>>16;
tb.ms_data_6->block_descriptor.block_size[1] =
((block_size*block_size_mult) & 0x00ff00)>>8;
tb.ms_data_6->block_descriptor.block_size[2] =
((block_size*block_size_mult) & 0x0000ff);
send_command_result(tb.ms_data_6,
MIN(sizeof(struct mode_sense_data_6), length));
break;
default:
send_command_failed_result();
cur_sense_data.sense_key=SENSE_ILLEGAL_REQUEST;
cur_sense_data.asc=ASC_INVALID_FIELD_IN_CBD;
cur_sense_data.ascq=0;
break;
}
break;
}
case SCSI_START_STOP_UNIT:
logf("scsi start_stop unit %d",lun);
if((cbw->command_block[4] & 0xf0) == 0) /*load/eject bit is valid*/
{ /* Process start and eject bits */
logf("scsi load/eject");
if((cbw->command_block[4] & 0x01) == 0) /* Don't start */
{
if((cbw->command_block[4] & 0x02) != 0) /* eject */
{
logf("scsi eject");
ejected[lun]=true;
}
}
}
send_csw(UMS_STATUS_GOOD);
break;
case SCSI_ALLOW_MEDIUM_REMOVAL:
logf("scsi allow_medium_removal %d",lun);
if((cbw->command_block[4] & 0x03) == 0) {
locked[lun]=false;
queue_broadcast(SYS_USB_LUN_LOCKED, (lun<<16)+0);
}
else {
locked[lun]=true;
queue_broadcast(SYS_USB_LUN_LOCKED, (lun<<16)+1);
}
send_csw(UMS_STATUS_GOOD);
break;
case SCSI_READ_FORMAT_CAPACITY: {
logf("scsi read_format_capacity %d",lun);
if(lun_present) {
tb.format_capacity_data->following_length=htobe32(8);
/* "block count" actually means "number of last block" */
tb.format_capacity_data->block_count =
htobe32(block_count/block_size_mult - 1);
tb.format_capacity_data->block_size =
htobe32(block_size*block_size_mult);
tb.format_capacity_data->block_size |=
htobe32(SCSI_FORMAT_CAPACITY_FORMATTED_MEDIA);
send_command_result(tb.format_capacity_data,
MIN(sizeof(struct format_capacity), length));
}
else {
send_command_failed_result();
cur_sense_data.sense_key=SENSE_NOT_READY;
cur_sense_data.asc=ASC_MEDIUM_NOT_PRESENT;
cur_sense_data.ascq=0;
}
break;
}
case SCSI_READ_CAPACITY: {
logf("scsi read_capacity %d",lun);
if(lun_present) {
/* "block count" actually means "number of last block" */
tb.capacity_data->block_count =
htobe32(block_count/block_size_mult - 1);
tb.capacity_data->block_size =
htobe32(block_size*block_size_mult);
send_command_result(tb.capacity_data,
MIN(sizeof(struct capacity), length));
}
else {
send_command_failed_result();
cur_sense_data.sense_key=SENSE_NOT_READY;
cur_sense_data.asc=ASC_MEDIUM_NOT_PRESENT;
cur_sense_data.ascq=0;
}
break;
}
case SCSI_READ_10:
logf("scsi read10 %d",lun);
if(!lun_present) {
send_command_failed_result();
cur_sense_data.sense_key=SENSE_NOT_READY;
cur_sense_data.asc=ASC_MEDIUM_NOT_PRESENT;
cur_sense_data.ascq=0;
break;
}
cur_cmd.data[0] = tb.transfer_buffer;
cur_cmd.data[1] = &tb.transfer_buffer[READ_BUFFER_SIZE];
cur_cmd.data_select=0;
cur_cmd.sector = block_size_mult *
(cbw->command_block[2] << 24 |
cbw->command_block[3] << 16 |
cbw->command_block[4] << 8 |
cbw->command_block[5] );
cur_cmd.count = block_size_mult *
(cbw->command_block[7] << 8 |
cbw->command_block[8]);
cur_cmd.orig_count = cur_cmd.count;
//logf("scsi read %d %d", cur_cmd.sector, cur_cmd.count);
if((cur_cmd.sector + cur_cmd.count) > block_count) {
send_csw(UMS_STATUS_FAIL);
cur_sense_data.sense_key=SENSE_ILLEGAL_REQUEST;
cur_sense_data.asc=ASC_LBA_OUT_OF_RANGE;
cur_sense_data.ascq=0;
}
else {
#ifdef USB_USE_RAMDISK
memcpy(cur_cmd.data[cur_cmd.data_select],
ramdisk_buffer + cur_cmd.sector*SECTOR_SIZE,
MIN(READ_BUFFER_SIZE/SECTOR_SIZE,cur_cmd.count)*SECTOR_SIZE);
#else
cur_cmd.last_result = storage_read_sectors(IF_MD(cur_cmd.lun,)
cur_cmd.sector,
MIN(READ_BUFFER_SIZE/SECTOR_SIZE, cur_cmd.count),
cur_cmd.data[cur_cmd.data_select]);
#endif
send_and_read_next();
}
break;
case SCSI_WRITE_10:
logf("scsi write10 %d",lun);
if(!lun_present) {
send_csw(UMS_STATUS_FAIL);
cur_sense_data.sense_key=SENSE_NOT_READY;
cur_sense_data.asc=ASC_MEDIUM_NOT_PRESENT;
cur_sense_data.ascq=0;
break;
}
cur_cmd.data[0] = tb.transfer_buffer;
cur_cmd.data[1] = &tb.transfer_buffer[WRITE_BUFFER_SIZE];
cur_cmd.data_select=0;
cur_cmd.sector = block_size_mult *
(cbw->command_block[2] << 24 |
cbw->command_block[3] << 16 |
cbw->command_block[4] << 8 |
cbw->command_block[5] );
cur_cmd.count = block_size_mult *
(cbw->command_block[7] << 8 |
cbw->command_block[8]);
cur_cmd.orig_count = cur_cmd.count;
/* expect data */
if((cur_cmd.sector + cur_cmd.count) > block_count) {
send_csw(UMS_STATUS_FAIL);
cur_sense_data.sense_key=SENSE_ILLEGAL_REQUEST;
cur_sense_data.asc=ASC_LBA_OUT_OF_RANGE;
cur_sense_data.ascq=0;
}
else {
receive_block_data(cur_cmd.data[0],
MIN(WRITE_BUFFER_SIZE, cur_cmd.count*SECTOR_SIZE));
}
break;
#if CONFIG_RTC
case SCSI_WRITE_BUFFER:
if(cbw->command_block[1]==1 /* mode = vendor specific */
&& cbw->command_block[2]==0 /* buffer id = 0 */
&& cbw->command_block[3]==0x0c /* offset (3 bytes) */
&& cbw->command_block[4]==0
&& cbw->command_block[5]==0
/* Some versions of itunes set the parameter list length to 0.
* Technically it should be 0x0c, which is what libgpod sends */
&& cbw->command_block[6]==0 /* parameter list (3 bytes) */
&& cbw->command_block[7]==0
&& (cbw->command_block[8]==0 || cbw->command_block[8]==0x0c)
&& cbw->command_block[9]==0)
receive_time();
break;
#endif /* CONFIG_RTC */
default:
logf("scsi unknown cmd %x",cbw->command_block[0x0]);
send_csw(UMS_STATUS_FAIL);
cur_sense_data.sense_key=SENSE_ILLEGAL_REQUEST;
cur_sense_data.asc=ASC_INVALID_COMMAND;
cur_sense_data.ascq=0;
break;
}
}
static void send_block_data(void *data,int size)
{
usb_drv_send_nonblocking(ep_in, data,size);
state = SENDING_BLOCKS;
}
static void send_command_result(void *data,int size)
{
usb_drv_send_nonblocking(ep_in, data,size);
state = SENDING_RESULT;
}
static void send_command_failed_result(void)
{
usb_drv_send_nonblocking(ep_in, NULL, 0);
state = SENDING_FAILED_RESULT;
}
#if CONFIG_RTC
static void receive_time(void)
{
usb_drv_recv(ep_out, tb.transfer_buffer, 12);
state = RECEIVING_TIME;
}
#endif /* CONFIG_RTC */
static void receive_block_data(void *data,int size)
{
usb_drv_recv(ep_out, data, size);
state = RECEIVING_BLOCKS;
}
static void send_csw(int status)
{
tb.csw->signature = htole32(CSW_SIGNATURE);
tb.csw->tag = cur_cmd.tag;
tb.csw->data_residue = 0;
tb.csw->status = status;
usb_drv_send_nonblocking(ep_in, tb.csw,
sizeof(struct command_status_wrapper));
state = WAITING_FOR_CSW_COMPLETION_OR_COMMAND;
//logf("CSW: %X",status);
/* Already start waiting for the next command */
usb_drv_recv(ep_out, cbw_buffer, MAX_CBW_SIZE);
/* The next completed transfer will be either the CSW one
* or the new command */
if(status == UMS_STATUS_GOOD) {
cur_sense_data.sense_key=0;
cur_sense_data.information=0;
cur_sense_data.asc=0;
cur_sense_data.ascq=0;
}
}
static void copy_padded(char *dest, char *src, int len)
{
for (int i = 0; i < len; i++) {
if (src[i] == '\0') {
memset(&dest[i], ' ', len - i);
return;
}
dest[i] = src[i];
}
}
/* build SCSI INQUIRY */
static void fill_inquiry(IF_MD_NONVOID(int lun))
{
struct storage_info info;
memset(tb.inquiry, 0, sizeof(struct inquiry_data));
storage_get_info(lun,&info);
copy_padded(tb.inquiry->VendorId,info.vendor,sizeof(tb.inquiry->VendorId));
copy_padded(tb.inquiry->ProductId,info.product,sizeof(tb.inquiry->ProductId));
copy_padded(tb.inquiry->ProductRevisionLevel,info.revision,sizeof(tb.inquiry->ProductRevisionLevel));
tb.inquiry->DeviceType = DIRECT_ACCESS_DEVICE;
tb.inquiry->AdditionalLength = 0x1f;
memset(tb.inquiry->Reserved, 0, 3);
tb.inquiry->Versions = 4; /* SPC-2 */
tb.inquiry->Format = 2; /* SPC-2/3 inquiry format */
tb.inquiry->DeviceTypeModifier = DEVICE_REMOVABLE;
}
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