These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / drivers / usb / storage / freecom.c
1 /* Driver for Freecom USB/IDE adaptor
2  *
3  * Freecom v0.1:
4  *
5  * First release
6  *
7  * Current development and maintenance by:
8  *   (C) 2000 David Brown <usb-storage@davidb.org>
9  *
10  * This program is free software; you can redistribute it and/or modify it
11  * under the terms of the GNU General Public License as published by the
12  * Free Software Foundation; either version 2, or (at your option) any
13  * later version.
14  *
15  * This program is distributed in the hope that it will be useful, but
16  * WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License along
21  * with this program; if not, write to the Free Software Foundation, Inc.,
22  * 675 Mass Ave, Cambridge, MA 02139, USA.
23  *
24  * This driver was developed with information provided in FREECOM's USB
25  * Programmers Reference Guide.  For further information contact Freecom
26  * (http://www.freecom.de/)
27  */
28
29 #include <linux/module.h>
30 #include <scsi/scsi.h>
31 #include <scsi/scsi_cmnd.h>
32
33 #include "usb.h"
34 #include "transport.h"
35 #include "protocol.h"
36 #include "debug.h"
37 #include "scsiglue.h"
38
39 #define DRV_NAME "ums-freecom"
40
41 MODULE_DESCRIPTION("Driver for Freecom USB/IDE adaptor");
42 MODULE_AUTHOR("David Brown <usb-storage@davidb.org>");
43 MODULE_LICENSE("GPL");
44
45 #ifdef CONFIG_USB_STORAGE_DEBUG
46 static void pdump(struct us_data *us, void *ibuffer, int length);
47 #endif
48
49 /* Bits of HD_STATUS */
50 #define ERR_STAT                0x01
51 #define DRQ_STAT                0x08
52
53 /* All of the outgoing packets are 64 bytes long. */
54 struct freecom_cb_wrap {
55         u8    Type;             /* Command type. */
56         u8    Timeout;          /* Timeout in seconds. */
57         u8    Atapi[12];        /* An ATAPI packet. */
58         u8    Filler[50];       /* Padding Data. */
59 };
60
61 struct freecom_xfer_wrap {
62         u8    Type;             /* Command type. */
63         u8    Timeout;          /* Timeout in seconds. */
64         __le32   Count;         /* Number of bytes to transfer. */
65         u8    Pad[58];
66 } __attribute__ ((packed));
67
68 struct freecom_ide_out {
69         u8    Type;             /* Type + IDE register. */
70         u8    Pad;
71         __le16   Value;         /* Value to write. */
72         u8    Pad2[60];
73 };
74
75 struct freecom_ide_in {
76         u8    Type;             /* Type | IDE register. */
77         u8    Pad[63];
78 };
79
80 struct freecom_status {
81         u8    Status;
82         u8    Reason;
83         __le16   Count;
84         u8    Pad[60];
85 };
86
87 /* Freecom stuffs the interrupt status in the INDEX_STAT bit of the ide
88  * register. */
89 #define FCM_INT_STATUS          0x02 /* INDEX_STAT */
90 #define FCM_STATUS_BUSY         0x80
91
92 /* These are the packet types.  The low bit indicates that this command
93  * should wait for an interrupt. */
94 #define FCM_PACKET_ATAPI        0x21
95 #define FCM_PACKET_STATUS       0x20
96
97 /* Receive data from the IDE interface.  The ATAPI packet has already
98  * waited, so the data should be immediately available. */
99 #define FCM_PACKET_INPUT        0x81
100
101 /* Send data to the IDE interface. */
102 #define FCM_PACKET_OUTPUT       0x01
103
104 /* Write a value to an ide register.  Or the ide register to write after
105  * munging the address a bit. */
106 #define FCM_PACKET_IDE_WRITE    0x40
107 #define FCM_PACKET_IDE_READ     0xC0
108
109 /* All packets (except for status) are 64 bytes long. */
110 #define FCM_PACKET_LENGTH               64
111 #define FCM_STATUS_PACKET_LENGTH        4
112
113 static int init_freecom(struct us_data *us);
114
115
116 /*
117  * The table of devices
118  */
119 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
120                     vendorName, productName, useProtocol, useTransport, \
121                     initFunction, flags) \
122 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
123   .driver_info = (flags) }
124
125 static struct usb_device_id freecom_usb_ids[] = {
126 #       include "unusual_freecom.h"
127         { }             /* Terminating entry */
128 };
129 MODULE_DEVICE_TABLE(usb, freecom_usb_ids);
130
131 #undef UNUSUAL_DEV
132
133 /*
134  * The flags table
135  */
136 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
137                     vendor_name, product_name, use_protocol, use_transport, \
138                     init_function, Flags) \
139 { \
140         .vendorName = vendor_name,      \
141         .productName = product_name,    \
142         .useProtocol = use_protocol,    \
143         .useTransport = use_transport,  \
144         .initFunction = init_function,  \
145 }
146
147 static struct us_unusual_dev freecom_unusual_dev_list[] = {
148 #       include "unusual_freecom.h"
149         { }             /* Terminating entry */
150 };
151
152 #undef UNUSUAL_DEV
153
154 static int
155 freecom_readdata (struct scsi_cmnd *srb, struct us_data *us,
156                 unsigned int ipipe, unsigned int opipe, int count)
157 {
158         struct freecom_xfer_wrap *fxfr =
159                 (struct freecom_xfer_wrap *) us->iobuf;
160         int result;
161
162         fxfr->Type = FCM_PACKET_INPUT | 0x00;
163         fxfr->Timeout = 0;    /* Short timeout for debugging. */
164         fxfr->Count = cpu_to_le32 (count);
165         memset (fxfr->Pad, 0, sizeof (fxfr->Pad));
166
167         usb_stor_dbg(us, "Read data Freecom! (c=%d)\n", count);
168
169         /* Issue the transfer command. */
170         result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
171                         FCM_PACKET_LENGTH, NULL);
172         if (result != USB_STOR_XFER_GOOD) {
173                 usb_stor_dbg(us, "Freecom readdata transport error\n");
174                 return USB_STOR_TRANSPORT_ERROR;
175         }
176
177         /* Now transfer all of our blocks. */
178         usb_stor_dbg(us, "Start of read\n");
179         result = usb_stor_bulk_srb(us, ipipe, srb);
180         usb_stor_dbg(us, "freecom_readdata done!\n");
181
182         if (result > USB_STOR_XFER_SHORT)
183                 return USB_STOR_TRANSPORT_ERROR;
184         return USB_STOR_TRANSPORT_GOOD;
185 }
186
187 static int
188 freecom_writedata (struct scsi_cmnd *srb, struct us_data *us,
189                 int unsigned ipipe, unsigned int opipe, int count)
190 {
191         struct freecom_xfer_wrap *fxfr =
192                 (struct freecom_xfer_wrap *) us->iobuf;
193         int result;
194
195         fxfr->Type = FCM_PACKET_OUTPUT | 0x00;
196         fxfr->Timeout = 0;    /* Short timeout for debugging. */
197         fxfr->Count = cpu_to_le32 (count);
198         memset (fxfr->Pad, 0, sizeof (fxfr->Pad));
199
200         usb_stor_dbg(us, "Write data Freecom! (c=%d)\n", count);
201
202         /* Issue the transfer command. */
203         result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
204                         FCM_PACKET_LENGTH, NULL);
205         if (result != USB_STOR_XFER_GOOD) {
206                 usb_stor_dbg(us, "Freecom writedata transport error\n");
207                 return USB_STOR_TRANSPORT_ERROR;
208         }
209
210         /* Now transfer all of our blocks. */
211         usb_stor_dbg(us, "Start of write\n");
212         result = usb_stor_bulk_srb(us, opipe, srb);
213
214         usb_stor_dbg(us, "freecom_writedata done!\n");
215         if (result > USB_STOR_XFER_SHORT)
216                 return USB_STOR_TRANSPORT_ERROR;
217         return USB_STOR_TRANSPORT_GOOD;
218 }
219
220 /*
221  * Transport for the Freecom USB/IDE adaptor.
222  *
223  */
224 static int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
225 {
226         struct freecom_cb_wrap *fcb;
227         struct freecom_status  *fst;
228         unsigned int ipipe, opipe;              /* We need both pipes. */
229         int result;
230         unsigned int partial;
231         int length;
232
233         fcb = (struct freecom_cb_wrap *) us->iobuf;
234         fst = (struct freecom_status *) us->iobuf;
235
236         usb_stor_dbg(us, "Freecom TRANSPORT STARTED\n");
237
238         /* Get handles for both transports. */
239         opipe = us->send_bulk_pipe;
240         ipipe = us->recv_bulk_pipe;
241
242         /* The ATAPI Command always goes out first. */
243         fcb->Type = FCM_PACKET_ATAPI | 0x00;
244         fcb->Timeout = 0;
245         memcpy (fcb->Atapi, srb->cmnd, 12);
246         memset (fcb->Filler, 0, sizeof (fcb->Filler));
247
248         US_DEBUG(pdump(us, srb->cmnd, 12));
249
250         /* Send it out. */
251         result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
252                         FCM_PACKET_LENGTH, NULL);
253
254         /* The Freecom device will only fail if there is something wrong in
255          * USB land.  It returns the status in its own registers, which
256          * come back in the bulk pipe. */
257         if (result != USB_STOR_XFER_GOOD) {
258                 usb_stor_dbg(us, "freecom transport error\n");
259                 return USB_STOR_TRANSPORT_ERROR;
260         }
261
262         /* There are times we can optimize out this status read, but it
263          * doesn't hurt us to always do it now. */
264         result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
265                         FCM_STATUS_PACKET_LENGTH, &partial);
266         usb_stor_dbg(us, "foo Status result %d %u\n", result, partial);
267         if (result != USB_STOR_XFER_GOOD)
268                 return USB_STOR_TRANSPORT_ERROR;
269
270         US_DEBUG(pdump(us, (void *)fst, partial));
271
272         /* The firmware will time-out commands after 20 seconds. Some commands
273          * can legitimately take longer than this, so we use a different
274          * command that only waits for the interrupt and then sends status,
275          * without having to send a new ATAPI command to the device.
276          *
277          * NOTE: There is some indication that a data transfer after a timeout
278          * may not work, but that is a condition that should never happen.
279          */
280         while (fst->Status & FCM_STATUS_BUSY) {
281                 usb_stor_dbg(us, "20 second USB/ATAPI bridge TIMEOUT occurred!\n");
282                 usb_stor_dbg(us, "fst->Status is %x\n", fst->Status);
283
284                 /* Get the status again */
285                 fcb->Type = FCM_PACKET_STATUS;
286                 fcb->Timeout = 0;
287                 memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
288                 memset (fcb->Filler, 0, sizeof (fcb->Filler));
289
290                 /* Send it out. */
291                 result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
292                                 FCM_PACKET_LENGTH, NULL);
293
294                 /* The Freecom device will only fail if there is something
295                  * wrong in USB land.  It returns the status in its own
296                  * registers, which come back in the bulk pipe.
297                  */
298                 if (result != USB_STOR_XFER_GOOD) {
299                         usb_stor_dbg(us, "freecom transport error\n");
300                         return USB_STOR_TRANSPORT_ERROR;
301                 }
302
303                 /* get the data */
304                 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
305                                 FCM_STATUS_PACKET_LENGTH, &partial);
306
307                 usb_stor_dbg(us, "bar Status result %d %u\n", result, partial);
308                 if (result != USB_STOR_XFER_GOOD)
309                         return USB_STOR_TRANSPORT_ERROR;
310
311                 US_DEBUG(pdump(us, (void *)fst, partial));
312         }
313
314         if (partial != 4)
315                 return USB_STOR_TRANSPORT_ERROR;
316         if ((fst->Status & 1) != 0) {
317                 usb_stor_dbg(us, "operation failed\n");
318                 return USB_STOR_TRANSPORT_FAILED;
319         }
320
321         /* The device might not have as much data available as we
322          * requested.  If you ask for more than the device has, this reads
323          * and such will hang. */
324         usb_stor_dbg(us, "Device indicates that it has %d bytes available\n",
325                      le16_to_cpu(fst->Count));
326         usb_stor_dbg(us, "SCSI requested %d\n", scsi_bufflen(srb));
327
328         /* Find the length we desire to read. */
329         switch (srb->cmnd[0]) {
330         case INQUIRY:
331         case REQUEST_SENSE:     /* 16 or 18 bytes? spec says 18, lots of devices only have 16 */
332         case MODE_SENSE:
333         case MODE_SENSE_10:
334                 length = le16_to_cpu(fst->Count);
335                 break;
336         default:
337                 length = scsi_bufflen(srb);
338         }
339
340         /* verify that this amount is legal */
341         if (length > scsi_bufflen(srb)) {
342                 length = scsi_bufflen(srb);
343                 usb_stor_dbg(us, "Truncating request to match buffer length: %d\n",
344                              length);
345         }
346
347         /* What we do now depends on what direction the data is supposed to
348          * move in. */
349
350         switch (us->srb->sc_data_direction) {
351         case DMA_FROM_DEVICE:
352                 /* catch bogus "read 0 length" case */
353                 if (!length)
354                         break;
355                 /* Make sure that the status indicates that the device
356                  * wants data as well. */
357                 if ((fst->Status & DRQ_STAT) == 0 || (fst->Reason & 3) != 2) {
358                         usb_stor_dbg(us, "SCSI wants data, drive doesn't have any\n");
359                         return USB_STOR_TRANSPORT_FAILED;
360                 }
361                 result = freecom_readdata (srb, us, ipipe, opipe, length);
362                 if (result != USB_STOR_TRANSPORT_GOOD)
363                         return result;
364
365                 usb_stor_dbg(us, "Waiting for status\n");
366                 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
367                                 FCM_PACKET_LENGTH, &partial);
368                 US_DEBUG(pdump(us, (void *)fst, partial));
369
370                 if (partial != 4 || result > USB_STOR_XFER_SHORT)
371                         return USB_STOR_TRANSPORT_ERROR;
372                 if ((fst->Status & ERR_STAT) != 0) {
373                         usb_stor_dbg(us, "operation failed\n");
374                         return USB_STOR_TRANSPORT_FAILED;
375                 }
376                 if ((fst->Reason & 3) != 3) {
377                         usb_stor_dbg(us, "Drive seems still hungry\n");
378                         return USB_STOR_TRANSPORT_FAILED;
379                 }
380                 usb_stor_dbg(us, "Transfer happy\n");
381                 break;
382
383         case DMA_TO_DEVICE:
384                 /* catch bogus "write 0 length" case */
385                 if (!length)
386                         break;
387                 /* Make sure the status indicates that the device wants to
388                  * send us data. */
389                 /* !!IMPLEMENT!! */
390                 result = freecom_writedata (srb, us, ipipe, opipe, length);
391                 if (result != USB_STOR_TRANSPORT_GOOD)
392                         return result;
393
394                 usb_stor_dbg(us, "Waiting for status\n");
395                 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
396                                 FCM_PACKET_LENGTH, &partial);
397
398                 if (partial != 4 || result > USB_STOR_XFER_SHORT)
399                         return USB_STOR_TRANSPORT_ERROR;
400                 if ((fst->Status & ERR_STAT) != 0) {
401                         usb_stor_dbg(us, "operation failed\n");
402                         return USB_STOR_TRANSPORT_FAILED;
403                 }
404                 if ((fst->Reason & 3) != 3) {
405                         usb_stor_dbg(us, "Drive seems still hungry\n");
406                         return USB_STOR_TRANSPORT_FAILED;
407                 }
408
409                 usb_stor_dbg(us, "Transfer happy\n");
410                 break;
411
412
413         case DMA_NONE:
414                 /* Easy, do nothing. */
415                 break;
416
417         default:
418                 /* should never hit here -- filtered in usb.c */
419                 usb_stor_dbg(us, "freecom unimplemented direction: %d\n",
420                              us->srb->sc_data_direction);
421                 /* Return fail, SCSI seems to handle this better. */
422                 return USB_STOR_TRANSPORT_FAILED;
423                 break;
424         }
425
426         return USB_STOR_TRANSPORT_GOOD;
427 }
428
429 static int init_freecom(struct us_data *us)
430 {
431         int result;
432         char *buffer = us->iobuf;
433
434         /* The DMA-mapped I/O buffer is 64 bytes long, just right for
435          * all our packets.  No need to allocate any extra buffer space.
436          */
437
438         result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
439                         0x4c, 0xc0, 0x4346, 0x0, buffer, 0x20, 3*HZ);
440         buffer[32] = '\0';
441         usb_stor_dbg(us, "String returned from FC init is: %s\n", buffer);
442
443         /* Special thanks to the people at Freecom for providing me with
444          * this "magic sequence", which they use in their Windows and MacOS
445          * drivers to make sure that all the attached perhiperals are
446          * properly reset.
447          */
448
449         /* send reset */
450         result = usb_stor_control_msg(us, us->send_ctrl_pipe,
451                         0x4d, 0x40, 0x24d8, 0x0, NULL, 0x0, 3*HZ);
452         usb_stor_dbg(us, "result from activate reset is %d\n", result);
453
454         /* wait 250ms */
455         mdelay(250);
456
457         /* clear reset */
458         result = usb_stor_control_msg(us, us->send_ctrl_pipe,
459                         0x4d, 0x40, 0x24f8, 0x0, NULL, 0x0, 3*HZ);
460         usb_stor_dbg(us, "result from clear reset is %d\n", result);
461
462         /* wait 3 seconds */
463         mdelay(3 * 1000);
464
465         return USB_STOR_TRANSPORT_GOOD;
466 }
467
468 static int usb_stor_freecom_reset(struct us_data *us)
469 {
470         printk (KERN_CRIT "freecom reset called\n");
471
472         /* We don't really have this feature. */
473         return FAILED;
474 }
475
476 #ifdef CONFIG_USB_STORAGE_DEBUG
477 static void pdump(struct us_data *us, void *ibuffer, int length)
478 {
479         static char line[80];
480         int offset = 0;
481         unsigned char *buffer = (unsigned char *) ibuffer;
482         int i, j;
483         int from, base;
484
485         offset = 0;
486         for (i = 0; i < length; i++) {
487                 if ((i & 15) == 0) {
488                         if (i > 0) {
489                                 offset += sprintf (line+offset, " - ");
490                                 for (j = i - 16; j < i; j++) {
491                                         if (buffer[j] >= 32 && buffer[j] <= 126)
492                                                 line[offset++] = buffer[j];
493                                         else
494                                                 line[offset++] = '.';
495                                 }
496                                 line[offset] = 0;
497                                 usb_stor_dbg(us, "%s\n", line);
498                                 offset = 0;
499                         }
500                         offset += sprintf (line+offset, "%08x:", i);
501                 } else if ((i & 7) == 0) {
502                         offset += sprintf (line+offset, " -");
503                 }
504                 offset += sprintf (line+offset, " %02x", buffer[i] & 0xff);
505         }
506
507         /* Add the last "chunk" of data. */
508         from = (length - 1) % 16;
509         base = ((length - 1) / 16) * 16;
510
511         for (i = from + 1; i < 16; i++)
512                 offset += sprintf (line+offset, "   ");
513         if (from < 8)
514                 offset += sprintf (line+offset, "  ");
515         offset += sprintf (line+offset, " - ");
516
517         for (i = 0; i <= from; i++) {
518                 if (buffer[base+i] >= 32 && buffer[base+i] <= 126)
519                         line[offset++] = buffer[base+i];
520                 else
521                         line[offset++] = '.';
522         }
523         line[offset] = 0;
524         usb_stor_dbg(us, "%s\n", line);
525         offset = 0;
526 }
527 #endif
528
529 static struct scsi_host_template freecom_host_template;
530
531 static int freecom_probe(struct usb_interface *intf,
532                          const struct usb_device_id *id)
533 {
534         struct us_data *us;
535         int result;
536
537         result = usb_stor_probe1(&us, intf, id,
538                         (id - freecom_usb_ids) + freecom_unusual_dev_list,
539                         &freecom_host_template);
540         if (result)
541                 return result;
542
543         us->transport_name = "Freecom";
544         us->transport = freecom_transport;
545         us->transport_reset = usb_stor_freecom_reset;
546         us->max_lun = 0;
547
548         result = usb_stor_probe2(us);
549         return result;
550 }
551
552 static struct usb_driver freecom_driver = {
553         .name =         DRV_NAME,
554         .probe =        freecom_probe,
555         .disconnect =   usb_stor_disconnect,
556         .suspend =      usb_stor_suspend,
557         .resume =       usb_stor_resume,
558         .reset_resume = usb_stor_reset_resume,
559         .pre_reset =    usb_stor_pre_reset,
560         .post_reset =   usb_stor_post_reset,
561         .id_table =     freecom_usb_ids,
562         .soft_unbind =  1,
563         .no_dynamic_id = 1,
564 };
565
566 module_usb_stor_driver(freecom_driver, freecom_host_template, DRV_NAME);