1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
// Code for handling USB Mass Storage Controller devices.
//
// Copyright (C) 2010 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "biosvar.h" // GET_GLOBALFLAT
#include "block.h" // DTYPE_USB
#include "blockcmd.h" // cdb_read
#include "config.h" // CONFIG_USB_MSC
#include "malloc.h" // free
#include "output.h" // dprintf
#include "std/disk.h" // DISK_RET_SUCCESS
#include "string.h" // memset
#include "usb.h" // struct usb_s
#include "usb-msc.h" // usb_msc_setup
#include "util.h" // bootprio_find_usb
struct usbdrive_s {
struct drive_s drive;
struct usb_pipe *bulkin, *bulkout;
int lun;
};
/****************************************************************
* Bulk-only drive command processing
****************************************************************/
#define USB_CDB_SIZE 12
#define CBW_SIGNATURE 0x43425355 // USBC
struct cbw_s {
u32 dCBWSignature;
u32 dCBWTag;
u32 dCBWDataTransferLength;
u8 bmCBWFlags;
u8 bCBWLUN;
u8 bCBWCBLength;
u8 CBWCB[16];
} PACKED;
#define CSW_SIGNATURE 0x53425355 // USBS
struct csw_s {
u32 dCSWSignature;
u32 dCSWTag;
u32 dCSWDataResidue;
u8 bCSWStatus;
} PACKED;
static int
usb_msc_send(struct usbdrive_s *udrive_gf, int dir, void *buf, u32 bytes)
{
struct usb_pipe *pipe;
if (dir == USB_DIR_OUT)
pipe = GET_GLOBALFLAT(udrive_gf->bulkout);
else
pipe = GET_GLOBALFLAT(udrive_gf->bulkin);
return usb_send_bulk(pipe, dir, buf, bytes);
}
// Low-level usb command transmit function.
int
usb_process_op(struct disk_op_s *op)
{
if (!CONFIG_USB_MSC)
return 0;
dprintf(16, "usb_cmd_data id=%p write=%d count=%d buf=%p\n"
, op->drive_gf, 0, op->count, op->buf_fl);
struct usbdrive_s *udrive_gf = container_of(
op->drive_gf, struct usbdrive_s, drive);
// Setup command block wrapper.
struct cbw_s cbw;
memset(&cbw, 0, sizeof(cbw));
int blocksize = scsi_fill_cmd(op, cbw.CBWCB, USB_CDB_SIZE);
if (blocksize < 0)
return default_process_op(op);
u32 bytes = blocksize * op->count;
cbw.dCBWSignature = CBW_SIGNATURE;
cbw.dCBWTag = 999; // XXX
cbw.dCBWDataTransferLength = bytes;
cbw.bmCBWFlags = scsi_is_read(op) ? USB_DIR_IN : USB_DIR_OUT;
cbw.bCBWLUN = GET_GLOBALFLAT(udrive_gf->lun);
cbw.bCBWCBLength = USB_CDB_SIZE;
// Transfer cbw to device.
int ret = usb_msc_send(udrive_gf, USB_DIR_OUT
, MAKE_FLATPTR(GET_SEG(SS), &cbw), sizeof(cbw));
if (ret)
goto fail;
// Transfer data to/from device.
if (bytes) {
ret = usb_msc_send(udrive_gf, cbw.bmCBWFlags, op->buf_fl, bytes);
if (ret)
goto fail;
}
// Transfer csw info.
struct csw_s csw;
ret = usb_msc_send(udrive_gf, USB_DIR_IN
, MAKE_FLATPTR(GET_SEG(SS), &csw), sizeof(csw));
if (ret)
goto fail;
if (!csw.bCSWStatus)
return DISK_RET_SUCCESS;
if (csw.bCSWStatus == 2)
goto fail;
if (blocksize)
op->count -= csw.dCSWDataResidue / blocksize;
return DISK_RET_EBADTRACK;
fail:
// XXX - reset connection
dprintf(1, "USB transmission failed\n");
return DISK_RET_EBADTRACK;
}
static int
usb_msc_maxlun(struct usb_pipe *pipe)
{
struct usb_ctrlrequest req;
req.bRequestType = USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
req.bRequest = 0xfe;
req.wValue = 0;
req.wIndex = 0;
req.wLength = 1;
unsigned char maxlun;
int ret = usb_send_default_control(pipe, &req, &maxlun);
if (ret)
return 0;
return maxlun;
}
static int
usb_msc_lun_setup(struct usb_pipe *inpipe, struct usb_pipe *outpipe,
struct usbdevice_s *usbdev, int lun)
{
// Allocate drive structure.
struct usbdrive_s *drive = malloc_fseg(sizeof(*drive));
if (!drive) {
warn_noalloc();
return -1;
}
memset(drive, 0, sizeof(*drive));
if (usb_32bit_pipe(inpipe))
drive->drive.type = DTYPE_USB_32;
else
drive->drive.type = DTYPE_USB;
drive->bulkin = inpipe;
drive->bulkout = outpipe;
drive->lun = lun;
int prio = bootprio_find_usb(usbdev, lun);
int ret = scsi_drive_setup(&drive->drive, "USB MSC", prio);
if (ret) {
dprintf(1, "Unable to configure USB MSC drive.\n");
free(drive);
return -1;
}
return 0;
}
/****************************************************************
* Setup
****************************************************************/
// Configure a usb msc device.
int
usb_msc_setup(struct usbdevice_s *usbdev)
{
if (!CONFIG_USB_MSC)
return -1;
// Verify right kind of device
struct usb_interface_descriptor *iface = usbdev->iface;
if ((iface->bInterfaceSubClass != US_SC_SCSI &&
iface->bInterfaceSubClass != US_SC_ATAPI_8070 &&
iface->bInterfaceSubClass != US_SC_ATAPI_8020)
|| iface->bInterfaceProtocol != US_PR_BULK) {
dprintf(1, "Unsupported MSC USB device (subclass=%02x proto=%02x)\n"
, iface->bInterfaceSubClass, iface->bInterfaceProtocol);
return -1;
}
// Find bulk in and bulk out endpoints.
struct usb_pipe *inpipe = NULL, *outpipe = NULL;
struct usb_endpoint_descriptor *indesc = usb_find_desc(
usbdev, USB_ENDPOINT_XFER_BULK, USB_DIR_IN);
struct usb_endpoint_descriptor *outdesc = usb_find_desc(
usbdev, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT);
if (!indesc || !outdesc)
goto fail;
inpipe = usb_alloc_pipe(usbdev, indesc);
outpipe = usb_alloc_pipe(usbdev, outdesc);
if (!inpipe || !outpipe)
goto fail;
int maxlun = usb_msc_maxlun(usbdev->defpipe);
int lun, pipesused = 0;
for (lun = 0; lun < maxlun + 1; lun++) {
int ret = usb_msc_lun_setup(inpipe, outpipe, usbdev, lun);
if (!ret)
pipesused = 1;
}
if (!pipesused)
goto fail;
return 0;
fail:
dprintf(1, "Unable to configure USB MSC device.\n");
usb_free_pipe(usbdev, inpipe);
usb_free_pipe(usbdev, outpipe);
return -1;
}
|
