1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * storage_common.c -- Common definitions for mass storage functionality
4 *
5 * Copyright (C) 2003-2008 Alan Stern
6 * Copyeight (C) 2009 Samsung Electronics
7 * Author: Michal Nazarewicz (m.nazarewicz@samsung.com)
8 *
9 * Ported to u-boot:
10 * Andrzej Pietrasiewicz <andrzej.p@samsung.com>
11 *
12 * Code refactoring & cleanup:
13 * Łukasz Majewski <l.majewski@samsung.com>
14 */
15
16
17 /*
18 * This file requires the following identifiers used in USB strings to
19 * be defined (each of type pointer to char):
20 * - fsg_string_manufacturer -- name of the manufacturer
21 * - fsg_string_product -- name of the product
22 * - fsg_string_serial -- product's serial
23 * - fsg_string_config -- name of the configuration
24 * - fsg_string_interface -- name of the interface
25 * The first four are only needed when FSG_DESCRIPTORS_DEVICE_STRINGS
26 * macro is defined prior to including this file.
27 */
28
29 /*
30 * When FSG_NO_INTR_EP is defined fsg_fs_intr_in_desc and
31 * fsg_hs_intr_in_desc objects as well as
32 * FSG_FS_FUNCTION_PRE_EP_ENTRIES and FSG_HS_FUNCTION_PRE_EP_ENTRIES
33 * macros are not defined.
34 *
35 * When FSG_NO_DEVICE_STRINGS is defined FSG_STRING_MANUFACTURER,
36 * FSG_STRING_PRODUCT, FSG_STRING_SERIAL and FSG_STRING_CONFIG are not
37 * defined (as well as corresponding entries in string tables are
38 * missing) and FSG_STRING_INTERFACE has value of zero.
39 *
40 * When FSG_NO_OTG is defined fsg_otg_desc won't be defined.
41 */
42
43 /*
44 * When FSG_BUFFHD_STATIC_BUFFER is defined when this file is included
45 * the fsg_buffhd structure's buf field will be an array of FSG_BUFLEN
46 * characters rather then a pointer to void.
47 */
48
49
50 /* #include <asm/unaligned.h> */
51
52
53 /*
54 * Thanks to NetChip Technologies for donating this product ID.
55 *
56 * DO NOT REUSE THESE IDs with any other driver!! Ever!!
57 * Instead: allocate your own, using normal USB-IF procedures.
58 */
59 #define FSG_VENDOR_ID 0x0525 /* NetChip */
60 #define FSG_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
61
62 /*-------------------------------------------------------------------------*/
63
64 #ifndef DEBUG
65 #undef VERBOSE_DEBUG
66 #undef DUMP_MSGS
67 #endif /* !DEBUG */
68
69 #ifdef VERBOSE_DEBUG
70 #define VLDBG LDBG
71 #else
72 #define VLDBG(lun, fmt, args...) do { } while (0)
73 #endif /* VERBOSE_DEBUG */
74
75 /*
76 #define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args)
77 #define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args)
78 #define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args)
79 #define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args)
80 */
81
82 #define LDBG(lun, fmt, args...) do { } while (0)
83 #define LERROR(lun, fmt, args...) do { } while (0)
84 #define LWARN(lun, fmt, args...) do { } while (0)
85 #define LINFO(lun, fmt, args...) do { } while (0)
86
87 /*
88 * Keep those macros in sync with those in
89 * include/linux/usb/composite.h or else GCC will complain. If they
90 * are identical (the same names of arguments, white spaces in the
91 * same places) GCC will allow redefinition otherwise (even if some
92 * white space is removed or added) warning will be issued.
93 *
94 * Those macros are needed here because File Storage Gadget does not
95 * include the composite.h header. For composite gadgets those macros
96 * are redundant since composite.h is included any way.
97 *
98 * One could check whether those macros are already defined (which
99 * would indicate composite.h had been included) or not (which would
100 * indicate we were in FSG) but this is not done because a warning is
101 * desired if definitions here differ from the ones in composite.h.
102 *
103 * We want the definitions to match and be the same in File Storage
104 * Gadget as well as Mass Storage Function (and so composite gadgets
105 * using MSF). If someone changes them in composite.h it will produce
106 * a warning in this file when building MSF.
107 */
108
109 #define DBG(d, fmt, args...) debug(fmt , ## args)
110 #define VDBG(d, fmt, args...) debug(fmt , ## args)
111 /* #define ERROR(d, fmt, args...) printf(fmt , ## args) */
112 /* #define WARNING(d, fmt, args...) printf(fmt , ## args) */
113 /* #define INFO(d, fmt, args...) printf(fmt , ## args) */
114
115 /* #define DBG(d, fmt, args...) do { } while (0) */
116 /* #define VDBG(d, fmt, args...) do { } while (0) */
117 #define ERROR(d, fmt, args...) do { } while (0)
118 #define WARNING(d, fmt, args...) do { } while (0)
119 #define INFO(d, fmt, args...) do { } while (0)
120
121 #ifdef DUMP_MSGS
122
123 /* dump_msg(fsg, const char * label, const u8 * buf, unsigned length); */
124 # define dump_msg(fsg, label, buf, length) do { \
125 if (length < 512) { \
126 DBG(fsg, "%s, length %u:\n", label, length); \
127 print_hex_dump("", DUMP_PREFIX_OFFSET, \
128 16, 1, buf, length, 0); \
129 } \
130 } while (0)
131
132 # define dump_cdb(fsg) do { } while (0)
133
134 #else
135
136 # define dump_msg(fsg, /* const char * */ label, \
137 /* const u8 * */ buf, /* unsigned */ length) do { } while (0)
138
139 # ifdef VERBOSE_DEBUG
140
141 # define dump_cdb(fsg) \
142 print_hex_dump("SCSI CDB: ", DUMP_PREFIX_NONE, \
143 16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \
144
145 # else
146
147 # define dump_cdb(fsg) do { } while (0)
148
149 # endif /* VERBOSE_DEBUG */
150
151 #endif /* DUMP_MSGS */
152
153 /*-------------------------------------------------------------------------*/
154
155 /* SCSI device types */
156 #define TYPE_DISK 0x00
157 #define TYPE_CDROM 0x05
158
159 /* USB protocol value = the transport method */
160 #define USB_PR_CBI 0x00 /* Control/Bulk/Interrupt */
161 #define USB_PR_CB 0x01 /* Control/Bulk w/o interrupt */
162 #define USB_PR_BULK 0x50 /* Bulk-only */
163
164 /* USB subclass value = the protocol encapsulation */
165 #define USB_SC_RBC 0x01 /* Reduced Block Commands (flash) */
166 #define USB_SC_8020 0x02 /* SFF-8020i, MMC-2, ATAPI (CD-ROM) */
167 #define USB_SC_QIC 0x03 /* QIC-157 (tape) */
168 #define USB_SC_UFI 0x04 /* UFI (floppy) */
169 #define USB_SC_8070 0x05 /* SFF-8070i (removable) */
170 #define USB_SC_SCSI 0x06 /* Transparent SCSI */
171
172 /* Bulk-only data structures */
173
174 /* Command Block Wrapper */
175 struct fsg_bulk_cb_wrap {
176 __le32 Signature; /* Contains 'USBC' */
177 u32 Tag; /* Unique per command id */
178 __le32 DataTransferLength; /* Size of the data */
179 u8 Flags; /* Direction in bit 7 */
180 u8 Lun; /* LUN (normally 0) */
181 u8 Length; /* Of the CDB, <= MAX_COMMAND_SIZE */
182 u8 CDB[16]; /* Command Data Block */
183 };
184
185 #define USB_BULK_CB_WRAP_LEN 31
186 #define USB_BULK_CB_SIG 0x43425355 /* Spells out USBC */
187 #define USB_BULK_IN_FLAG 0x80
188
189 /* Command Status Wrapper */
190 struct bulk_cs_wrap {
191 __le32 Signature; /* Should = 'USBS' */
192 u32 Tag; /* Same as original command */
193 __le32 Residue; /* Amount not transferred */
194 u8 Status; /* See below */
195 };
196
197 #define USB_BULK_CS_WRAP_LEN 13
198 #define USB_BULK_CS_SIG 0x53425355 /* Spells out 'USBS' */
199 #define USB_STATUS_PASS 0
200 #define USB_STATUS_FAIL 1
201 #define USB_STATUS_PHASE_ERROR 2
202
203 /* Bulk-only class specific requests */
204 #define USB_BULK_RESET_REQUEST 0xff
205 #define USB_BULK_GET_MAX_LUN_REQUEST 0xfe
206
207 /* CBI Interrupt data structure */
208 struct interrupt_data {
209 u8 bType;
210 u8 bValue;
211 };
212
213 #define CBI_INTERRUPT_DATA_LEN 2
214
215 /* CBI Accept Device-Specific Command request */
216 #define USB_CBI_ADSC_REQUEST 0x00
217
218 /* Length of a SCSI Command Data Block */
219 #define MAX_COMMAND_SIZE 16
220
221 /* SCSI commands that we recognize */
222 #define SC_FORMAT_UNIT 0x04
223 #define SC_INQUIRY 0x12
224 #define SC_MODE_SELECT_6 0x15
225 #define SC_MODE_SELECT_10 0x55
226 #define SC_MODE_SENSE_6 0x1a
227 #define SC_MODE_SENSE_10 0x5a
228 #define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e
229 #define SC_READ_6 0x08
230 #define SC_READ_10 0x28
231 #define SC_READ_12 0xa8
232 #define SC_READ_CAPACITY 0x25
233 #define SC_READ_FORMAT_CAPACITIES 0x23
234 #define SC_READ_HEADER 0x44
235 #define SC_READ_TOC 0x43
236 #define SC_RELEASE 0x17
237 #define SC_REQUEST_SENSE 0x03
238 #define SC_RESERVE 0x16
239 #define SC_SEND_DIAGNOSTIC 0x1d
240 #define SC_START_STOP_UNIT 0x1b
241 #define SC_SYNCHRONIZE_CACHE 0x35
242 #define SC_TEST_UNIT_READY 0x00
243 #define SC_VERIFY 0x2f
244 #define SC_WRITE_6 0x0a
245 #define SC_WRITE_10 0x2a
246 #define SC_WRITE_12 0xaa
247
248 /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
249 #define SS_NO_SENSE 0
250 #define SS_COMMUNICATION_FAILURE 0x040800
251 #define SS_INVALID_COMMAND 0x052000
252 #define SS_INVALID_FIELD_IN_CDB 0x052400
253 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
254 #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
255 #define SS_MEDIUM_NOT_PRESENT 0x023a00
256 #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
257 #define SS_NOT_READY_TO_READY_TRANSITION 0x062800
258 #define SS_RESET_OCCURRED 0x062900
259 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
260 #define SS_UNRECOVERED_READ_ERROR 0x031100
261 #define SS_WRITE_ERROR 0x030c02
262 #define SS_WRITE_PROTECTED 0x072700
263
264 #define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */
265 #define ASC(x) ((u8) ((x) >> 8))
266 #define ASCQ(x) ((u8) (x))
267
268 struct device_attribute { int i; };
269 #define ETOOSMALL 525
270
271 #include <usb_mass_storage.h>
272
273 /*-------------------------------------------------------------------------*/
274
275 struct fsg_lun {
276 loff_t file_length;
277 loff_t num_sectors;
278
279 unsigned int initially_ro:1;
280 unsigned int ro:1;
281 unsigned int removable:1;
282 unsigned int cdrom:1;
283 unsigned int prevent_medium_removal:1;
284 unsigned int registered:1;
285 unsigned int info_valid:1;
286 unsigned int nofua:1;
287
288 u32 sense_data;
289 u32 sense_data_info;
290 u32 unit_attention_data;
291
292 struct device dev;
293 };
294
295 #define fsg_lun_is_open(curlun) ((curlun)->filp != NULL)
296 #if 0
297 static struct fsg_lun *fsg_lun_from_dev(struct device *dev)
298 {
299 return container_of(dev, struct fsg_lun, dev);
300 }
301 #endif
302
303 /* Big enough to hold our biggest descriptor */
304 #define EP0_BUFSIZE 256
305 #define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */
306
307 /* Number of buffers we will use. 2 is enough for double-buffering */
308 #define FSG_NUM_BUFFERS 2
309
310 /* Default size of buffer length. */
311 #define FSG_BUFLEN ((u32)131072)
312
313 /* Maximal number of LUNs supported in mass storage function */
314 #define FSG_MAX_LUNS 8
315
316 enum fsg_buffer_state {
317 BUF_STATE_EMPTY = 0,
318 BUF_STATE_FULL,
319 BUF_STATE_BUSY
320 };
321
322 struct fsg_buffhd {
323 #ifdef FSG_BUFFHD_STATIC_BUFFER
324 char buf[FSG_BUFLEN];
325 #else
326 void *buf;
327 #endif
328 enum fsg_buffer_state state;
329 struct fsg_buffhd *next;
330
331 /*
332 * The NetChip 2280 is faster, and handles some protocol faults
333 * better, if we don't submit any short bulk-out read requests.
334 * So we will record the intended request length here.
335 */
336 unsigned int bulk_out_intended_length;
337
338 struct usb_request *inreq;
339 int inreq_busy;
340 struct usb_request *outreq;
341 int outreq_busy;
342 };
343
344 enum fsg_state {
345 /* This one isn't used anywhere */
346 FSG_STATE_COMMAND_PHASE = -10,
347 FSG_STATE_DATA_PHASE,
348 FSG_STATE_STATUS_PHASE,
349
350 FSG_STATE_IDLE = 0,
351 FSG_STATE_ABORT_BULK_OUT,
352 FSG_STATE_RESET,
353 FSG_STATE_INTERFACE_CHANGE,
354 FSG_STATE_CONFIG_CHANGE,
355 FSG_STATE_DISCONNECT,
356 FSG_STATE_EXIT,
357 FSG_STATE_TERMINATED
358 };
359
360 enum data_direction {
361 DATA_DIR_UNKNOWN = 0,
362 DATA_DIR_FROM_HOST,
363 DATA_DIR_TO_HOST,
364 DATA_DIR_NONE
365 };
366
367 /*-------------------------------------------------------------------------*/
368
get_unaligned_be24(u8 * buf)369 static inline u32 get_unaligned_be24(u8 *buf)
370 {
371 return 0xffffff & (u32) get_unaligned_be32(buf - 1);
372 }
373
374 /*-------------------------------------------------------------------------*/
375
376 enum {
377 #ifndef FSG_NO_DEVICE_STRINGS
378 FSG_STRING_MANUFACTURER = 1,
379 FSG_STRING_PRODUCT,
380 FSG_STRING_SERIAL,
381 FSG_STRING_CONFIG,
382 #endif
383 FSG_STRING_INTERFACE
384 };
385
386 #ifndef FSG_NO_OTG
387 static struct usb_otg_descriptor
388 fsg_otg_desc = {
389 .bLength = sizeof fsg_otg_desc,
390 .bDescriptorType = USB_DT_OTG,
391
392 .bmAttributes = USB_OTG_SRP,
393 };
394 #endif
395
396 /* There is only one interface. */
397
398 static struct usb_interface_descriptor
399 fsg_intf_desc = {
400 .bLength = sizeof fsg_intf_desc,
401 .bDescriptorType = USB_DT_INTERFACE,
402
403 .bNumEndpoints = 2, /* Adjusted during fsg_bind() */
404 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
405 .bInterfaceSubClass = USB_SC_SCSI, /* Adjusted during fsg_bind() */
406 .bInterfaceProtocol = USB_PR_BULK, /* Adjusted during fsg_bind() */
407 .iInterface = FSG_STRING_INTERFACE,
408 };
409
410 /*
411 * Three full-speed endpoint descriptors: bulk-in, bulk-out, and
412 * interrupt-in.
413 */
414
415 static struct usb_endpoint_descriptor
416 fsg_fs_bulk_in_desc = {
417 .bLength = USB_DT_ENDPOINT_SIZE,
418 .bDescriptorType = USB_DT_ENDPOINT,
419
420 .bEndpointAddress = USB_DIR_IN,
421 .bmAttributes = USB_ENDPOINT_XFER_BULK,
422 /* wMaxPacketSize set by autoconfiguration */
423 };
424
425 static struct usb_endpoint_descriptor
426 fsg_fs_bulk_out_desc = {
427 .bLength = USB_DT_ENDPOINT_SIZE,
428 .bDescriptorType = USB_DT_ENDPOINT,
429
430 .bEndpointAddress = USB_DIR_OUT,
431 .bmAttributes = USB_ENDPOINT_XFER_BULK,
432 /* wMaxPacketSize set by autoconfiguration */
433 };
434
435 #ifndef FSG_NO_INTR_EP
436
437 static struct usb_endpoint_descriptor
438 fsg_fs_intr_in_desc = {
439 .bLength = USB_DT_ENDPOINT_SIZE,
440 .bDescriptorType = USB_DT_ENDPOINT,
441
442 .bEndpointAddress = USB_DIR_IN,
443 .bmAttributes = USB_ENDPOINT_XFER_INT,
444 .wMaxPacketSize = cpu_to_le16(2),
445 .bInterval = 32, /* frames -> 32 ms */
446 };
447
448 #ifndef FSG_NO_OTG
449 # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 2
450 #else
451 # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 1
452 #endif
453
454 #endif
455
456 static struct usb_descriptor_header *fsg_fs_function[] = {
457 #ifndef FSG_NO_OTG
458 (struct usb_descriptor_header *) &fsg_otg_desc,
459 #endif
460 (struct usb_descriptor_header *) &fsg_intf_desc,
461 (struct usb_descriptor_header *) &fsg_fs_bulk_in_desc,
462 (struct usb_descriptor_header *) &fsg_fs_bulk_out_desc,
463 #ifndef FSG_NO_INTR_EP
464 (struct usb_descriptor_header *) &fsg_fs_intr_in_desc,
465 #endif
466 NULL,
467 };
468
469 /*
470 * USB 2.0 devices need to expose both high speed and full speed
471 * descriptors, unless they only run at full speed.
472 *
473 * That means alternate endpoint descriptors (bigger packets)
474 * and a "device qualifier" ... plus more construction options
475 * for the configuration descriptor.
476 */
477 static struct usb_endpoint_descriptor
478 fsg_hs_bulk_in_desc = {
479 .bLength = USB_DT_ENDPOINT_SIZE,
480 .bDescriptorType = USB_DT_ENDPOINT,
481
482 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
483 .bmAttributes = USB_ENDPOINT_XFER_BULK,
484 .wMaxPacketSize = cpu_to_le16(512),
485 };
486
487 static struct usb_endpoint_descriptor
488 fsg_hs_bulk_out_desc = {
489 .bLength = USB_DT_ENDPOINT_SIZE,
490 .bDescriptorType = USB_DT_ENDPOINT,
491
492 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
493 .bmAttributes = USB_ENDPOINT_XFER_BULK,
494 .wMaxPacketSize = cpu_to_le16(512),
495 .bInterval = 1, /* NAK every 1 uframe */
496 };
497
498 #ifndef FSG_NO_INTR_EP
499
500 static struct usb_endpoint_descriptor
501 fsg_hs_intr_in_desc = {
502 .bLength = USB_DT_ENDPOINT_SIZE,
503 .bDescriptorType = USB_DT_ENDPOINT,
504
505 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
506 .bmAttributes = USB_ENDPOINT_XFER_INT,
507 .wMaxPacketSize = cpu_to_le16(2),
508 .bInterval = 9, /* 2**(9-1) = 256 uframes -> 32 ms */
509 };
510
511 #ifndef FSG_NO_OTG
512 # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 2
513 #else
514 # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 1
515 #endif
516
517 #endif
518
519 static struct usb_descriptor_header *fsg_hs_function[] = {
520 #ifndef FSG_NO_OTG
521 (struct usb_descriptor_header *) &fsg_otg_desc,
522 #endif
523 (struct usb_descriptor_header *) &fsg_intf_desc,
524 (struct usb_descriptor_header *) &fsg_hs_bulk_in_desc,
525 (struct usb_descriptor_header *) &fsg_hs_bulk_out_desc,
526 #ifndef FSG_NO_INTR_EP
527 (struct usb_descriptor_header *) &fsg_hs_intr_in_desc,
528 #endif
529 NULL,
530 };
531
532 /* Maxpacket and other transfer characteristics vary by speed. */
533 static struct usb_endpoint_descriptor *
fsg_ep_desc(struct usb_gadget * g,struct usb_endpoint_descriptor * fs,struct usb_endpoint_descriptor * hs)534 fsg_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
535 struct usb_endpoint_descriptor *hs)
536 {
537 if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
538 return hs;
539 return fs;
540 }
541
542 /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
543 static struct usb_string fsg_strings[] = {
544 #ifndef FSG_NO_DEVICE_STRINGS
545 {FSG_STRING_MANUFACTURER, fsg_string_manufacturer},
546 {FSG_STRING_PRODUCT, fsg_string_product},
547 {FSG_STRING_SERIAL, fsg_string_serial},
548 {FSG_STRING_CONFIG, fsg_string_config},
549 #endif
550 {FSG_STRING_INTERFACE, fsg_string_interface},
551 {}
552 };
553
554 static struct usb_gadget_strings fsg_stringtab = {
555 .language = 0x0409, /* en-us */
556 .strings = fsg_strings,
557 };
558
559 /*-------------------------------------------------------------------------*/
560
561 /*
562 * If the next two routines are called while the gadget is registered,
563 * the caller must own fsg->filesem for writing.
564 */
565
fsg_lun_open(struct fsg_lun * curlun,unsigned int num_sectors,const char * filename)566 static int fsg_lun_open(struct fsg_lun *curlun, unsigned int num_sectors,
567 const char *filename)
568 {
569 int ro;
570
571 /* R/W if we can, R/O if we must */
572 ro = curlun->initially_ro;
573
574 curlun->ro = ro;
575 curlun->file_length = num_sectors << 9;
576 curlun->num_sectors = num_sectors;
577 debug("open backing file: %s\n", filename);
578
579 return 0;
580 }
581
fsg_lun_close(struct fsg_lun * curlun)582 static void fsg_lun_close(struct fsg_lun *curlun)
583 {
584 }
585
586 /*-------------------------------------------------------------------------*/
587
588 /*
589 * Sync the file data, don't bother with the metadata.
590 * This code was copied from fs/buffer.c:sys_fdatasync().
591 */
fsg_lun_fsync_sub(struct fsg_lun * curlun)592 static int fsg_lun_fsync_sub(struct fsg_lun *curlun)
593 {
594 return 0;
595 }
596
store_cdrom_address(u8 * dest,int msf,u32 addr)597 static void store_cdrom_address(u8 *dest, int msf, u32 addr)
598 {
599 if (msf) {
600 /* Convert to Minutes-Seconds-Frames */
601 addr >>= 2; /* Convert to 2048-byte frames */
602 addr += 2*75; /* Lead-in occupies 2 seconds */
603 dest[3] = addr % 75; /* Frames */
604 addr /= 75;
605 dest[2] = addr % 60; /* Seconds */
606 addr /= 60;
607 dest[1] = addr; /* Minutes */
608 dest[0] = 0; /* Reserved */
609 } else {
610 /* Absolute sector */
611 put_unaligned_be32(addr, dest);
612 }
613 }
614
615 /*-------------------------------------------------------------------------*/
616