1 /* Driver for Freecom USB/IDE adaptor
7 * Current development and maintenance by:
8 * (C) 2000 David Brown <usb-storage@davidb.org>
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
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.
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.
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/)
29 #include <linux/hdreg.h>
31 #include <scsi/scsi.h>
32 #include <scsi/scsi_cmnd.h>
35 #include "transport.h"
40 #ifdef CONFIG_USB_STORAGE_DEBUG
41 static void pdump (void *, int);
44 /* Bits of HD_STATUS */
48 /* All of the outgoing packets are 64 bytes long. */
49 struct freecom_cb_wrap {
50 u8 Type; /* Command type. */
51 u8 Timeout; /* Timeout in seconds. */
52 u8 Atapi[12]; /* An ATAPI packet. */
53 u8 Filler[50]; /* Padding Data. */
56 struct freecom_xfer_wrap {
57 u8 Type; /* Command type. */
58 u8 Timeout; /* Timeout in seconds. */
59 __le32 Count; /* Number of bytes to transfer. */
61 } __attribute__ ((packed));
63 struct freecom_ide_out {
64 u8 Type; /* Type + IDE register. */
66 __le16 Value; /* Value to write. */
70 struct freecom_ide_in {
71 u8 Type; /* Type | IDE register. */
75 struct freecom_status {
82 /* Freecom stuffs the interrupt status in the INDEX_STAT bit of the ide
84 #define FCM_INT_STATUS 0x02 /* INDEX_STAT */
85 #define FCM_STATUS_BUSY 0x80
87 /* These are the packet types. The low bit indicates that this command
88 * should wait for an interrupt. */
89 #define FCM_PACKET_ATAPI 0x21
90 #define FCM_PACKET_STATUS 0x20
92 /* Receive data from the IDE interface. The ATAPI packet has already
93 * waited, so the data should be immediately available. */
94 #define FCM_PACKET_INPUT 0x81
96 /* Send data to the IDE interface. */
97 #define FCM_PACKET_OUTPUT 0x01
99 /* Write a value to an ide register. Or the ide register to write after
100 * munging the address a bit. */
101 #define FCM_PACKET_IDE_WRITE 0x40
102 #define FCM_PACKET_IDE_READ 0xC0
104 /* All packets (except for status) are 64 bytes long. */
105 #define FCM_PACKET_LENGTH 64
106 #define FCM_STATUS_PACKET_LENGTH 4
109 freecom_readdata (struct scsi_cmnd *srb, struct us_data *us,
110 unsigned int ipipe, unsigned int opipe, int count)
112 struct freecom_xfer_wrap *fxfr =
113 (struct freecom_xfer_wrap *) us->iobuf;
116 fxfr->Type = FCM_PACKET_INPUT | 0x00;
117 fxfr->Timeout = 0; /* Short timeout for debugging. */
118 fxfr->Count = cpu_to_le32 (count);
119 memset (fxfr->Pad, 0, sizeof (fxfr->Pad));
121 US_DEBUGP("Read data Freecom! (c=%d)\n", count);
123 /* Issue the transfer command. */
124 result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
125 FCM_PACKET_LENGTH, NULL);
126 if (result != USB_STOR_XFER_GOOD) {
127 US_DEBUGP ("Freecom readdata transport error\n");
128 return USB_STOR_TRANSPORT_ERROR;
131 /* Now transfer all of our blocks. */
132 US_DEBUGP("Start of read\n");
133 result = usb_stor_bulk_srb(us, ipipe, srb);
134 US_DEBUGP("freecom_readdata done!\n");
136 if (result > USB_STOR_XFER_SHORT)
137 return USB_STOR_TRANSPORT_ERROR;
138 return USB_STOR_TRANSPORT_GOOD;
142 freecom_writedata (struct scsi_cmnd *srb, struct us_data *us,
143 int unsigned ipipe, unsigned int opipe, int count)
145 struct freecom_xfer_wrap *fxfr =
146 (struct freecom_xfer_wrap *) us->iobuf;
149 fxfr->Type = FCM_PACKET_OUTPUT | 0x00;
150 fxfr->Timeout = 0; /* Short timeout for debugging. */
151 fxfr->Count = cpu_to_le32 (count);
152 memset (fxfr->Pad, 0, sizeof (fxfr->Pad));
154 US_DEBUGP("Write data Freecom! (c=%d)\n", count);
156 /* Issue the transfer command. */
157 result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
158 FCM_PACKET_LENGTH, NULL);
159 if (result != USB_STOR_XFER_GOOD) {
160 US_DEBUGP ("Freecom writedata transport error\n");
161 return USB_STOR_TRANSPORT_ERROR;
164 /* Now transfer all of our blocks. */
165 US_DEBUGP("Start of write\n");
166 result = usb_stor_bulk_srb(us, opipe, srb);
168 US_DEBUGP("freecom_writedata done!\n");
169 if (result > USB_STOR_XFER_SHORT)
170 return USB_STOR_TRANSPORT_ERROR;
171 return USB_STOR_TRANSPORT_GOOD;
175 * Transport for the Freecom USB/IDE adaptor.
178 int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
180 struct freecom_cb_wrap *fcb;
181 struct freecom_status *fst;
182 unsigned int ipipe, opipe; /* We need both pipes. */
184 unsigned int partial;
187 fcb = (struct freecom_cb_wrap *) us->iobuf;
188 fst = (struct freecom_status *) us->iobuf;
190 US_DEBUGP("Freecom TRANSPORT STARTED\n");
192 /* Get handles for both transports. */
193 opipe = us->send_bulk_pipe;
194 ipipe = us->recv_bulk_pipe;
196 /* The ATAPI Command always goes out first. */
197 fcb->Type = FCM_PACKET_ATAPI | 0x00;
199 memcpy (fcb->Atapi, srb->cmnd, 12);
200 memset (fcb->Filler, 0, sizeof (fcb->Filler));
202 US_DEBUG(pdump (srb->cmnd, 12));
205 result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
206 FCM_PACKET_LENGTH, NULL);
208 /* The Freecom device will only fail if there is something wrong in
209 * USB land. It returns the status in its own registers, which
210 * come back in the bulk pipe. */
211 if (result != USB_STOR_XFER_GOOD) {
212 US_DEBUGP ("freecom transport error\n");
213 return USB_STOR_TRANSPORT_ERROR;
216 /* There are times we can optimize out this status read, but it
217 * doesn't hurt us to always do it now. */
218 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
219 FCM_STATUS_PACKET_LENGTH, &partial);
220 US_DEBUGP("foo Status result %d %u\n", result, partial);
221 if (result != USB_STOR_XFER_GOOD)
222 return USB_STOR_TRANSPORT_ERROR;
224 US_DEBUG(pdump ((void *) fst, partial));
226 /* The firmware will time-out commands after 20 seconds. Some commands
227 * can legitimately take longer than this, so we use a different
228 * command that only waits for the interrupt and then sends status,
229 * without having to send a new ATAPI command to the device.
231 * NOTE: There is some indication that a data transfer after a timeout
232 * may not work, but that is a condition that should never happen.
234 while (fst->Status & FCM_STATUS_BUSY) {
235 US_DEBUGP("20 second USB/ATAPI bridge TIMEOUT occurred!\n");
236 US_DEBUGP("fst->Status is %x\n", fst->Status);
238 /* Get the status again */
239 fcb->Type = FCM_PACKET_STATUS;
241 memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
242 memset (fcb->Filler, 0, sizeof (fcb->Filler));
245 result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
246 FCM_PACKET_LENGTH, NULL);
248 /* The Freecom device will only fail if there is something
249 * wrong in USB land. It returns the status in its own
250 * registers, which come back in the bulk pipe.
252 if (result != USB_STOR_XFER_GOOD) {
253 US_DEBUGP ("freecom transport error\n");
254 return USB_STOR_TRANSPORT_ERROR;
258 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
259 FCM_STATUS_PACKET_LENGTH, &partial);
261 US_DEBUGP("bar Status result %d %u\n", result, partial);
262 if (result != USB_STOR_XFER_GOOD)
263 return USB_STOR_TRANSPORT_ERROR;
265 US_DEBUG(pdump ((void *) fst, partial));
269 return USB_STOR_TRANSPORT_ERROR;
270 if ((fst->Status & 1) != 0) {
271 US_DEBUGP("operation failed\n");
272 return USB_STOR_TRANSPORT_FAILED;
275 /* The device might not have as much data available as we
276 * requested. If you ask for more than the device has, this reads
277 * and such will hang. */
278 US_DEBUGP("Device indicates that it has %d bytes available\n",
279 le16_to_cpu (fst->Count));
280 US_DEBUGP("SCSI requested %d\n", scsi_bufflen(srb));
282 /* Find the length we desire to read. */
283 switch (srb->cmnd[0]) {
285 case REQUEST_SENSE: /* 16 or 18 bytes? spec says 18, lots of devices only have 16 */
288 length = le16_to_cpu(fst->Count);
291 length = scsi_bufflen(srb);
294 /* verify that this amount is legal */
295 if (length > scsi_bufflen(srb)) {
296 length = scsi_bufflen(srb);
297 US_DEBUGP("Truncating request to match buffer length: %d\n", length);
300 /* What we do now depends on what direction the data is supposed to
303 switch (us->srb->sc_data_direction) {
304 case DMA_FROM_DEVICE:
305 /* catch bogus "read 0 length" case */
308 /* Make sure that the status indicates that the device
309 * wants data as well. */
310 if ((fst->Status & DRQ_STAT) == 0 || (fst->Reason & 3) != 2) {
311 US_DEBUGP("SCSI wants data, drive doesn't have any\n");
312 return USB_STOR_TRANSPORT_FAILED;
314 result = freecom_readdata (srb, us, ipipe, opipe, length);
315 if (result != USB_STOR_TRANSPORT_GOOD)
318 US_DEBUGP("FCM: Waiting for status\n");
319 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
320 FCM_PACKET_LENGTH, &partial);
321 US_DEBUG(pdump ((void *) fst, partial));
323 if (partial != 4 || result > USB_STOR_XFER_SHORT)
324 return USB_STOR_TRANSPORT_ERROR;
325 if ((fst->Status & ERR_STAT) != 0) {
326 US_DEBUGP("operation failed\n");
327 return USB_STOR_TRANSPORT_FAILED;
329 if ((fst->Reason & 3) != 3) {
330 US_DEBUGP("Drive seems still hungry\n");
331 return USB_STOR_TRANSPORT_FAILED;
333 US_DEBUGP("Transfer happy\n");
337 /* catch bogus "write 0 length" case */
340 /* Make sure the status indicates that the device wants to
343 result = freecom_writedata (srb, us, ipipe, opipe, length);
344 if (result != USB_STOR_TRANSPORT_GOOD)
347 US_DEBUGP("FCM: Waiting for status\n");
348 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
349 FCM_PACKET_LENGTH, &partial);
351 if (partial != 4 || result > USB_STOR_XFER_SHORT)
352 return USB_STOR_TRANSPORT_ERROR;
353 if ((fst->Status & ERR_STAT) != 0) {
354 US_DEBUGP("operation failed\n");
355 return USB_STOR_TRANSPORT_FAILED;
357 if ((fst->Reason & 3) != 3) {
358 US_DEBUGP("Drive seems still hungry\n");
359 return USB_STOR_TRANSPORT_FAILED;
362 US_DEBUGP("Transfer happy\n");
367 /* Easy, do nothing. */
371 /* should never hit here -- filtered in usb.c */
372 US_DEBUGP ("freecom unimplemented direction: %d\n",
373 us->srb->sc_data_direction);
374 // Return fail, SCSI seems to handle this better.
375 return USB_STOR_TRANSPORT_FAILED;
379 return USB_STOR_TRANSPORT_GOOD;
383 freecom_init (struct us_data *us)
386 char *buffer = us->iobuf;
388 /* The DMA-mapped I/O buffer is 64 bytes long, just right for
389 * all our packets. No need to allocate any extra buffer space.
392 result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
393 0x4c, 0xc0, 0x4346, 0x0, buffer, 0x20, 3*HZ);
395 US_DEBUGP("String returned from FC init is: %s\n", buffer);
397 /* Special thanks to the people at Freecom for providing me with
398 * this "magic sequence", which they use in their Windows and MacOS
399 * drivers to make sure that all the attached perhiperals are
404 result = usb_stor_control_msg(us, us->send_ctrl_pipe,
405 0x4d, 0x40, 0x24d8, 0x0, NULL, 0x0, 3*HZ);
406 US_DEBUGP("result from activate reset is %d\n", result);
412 result = usb_stor_control_msg(us, us->send_ctrl_pipe,
413 0x4d, 0x40, 0x24f8, 0x0, NULL, 0x0, 3*HZ);
414 US_DEBUGP("result from clear reset is %d\n", result);
419 return USB_STOR_TRANSPORT_GOOD;
422 int usb_stor_freecom_reset(struct us_data *us)
424 printk (KERN_CRIT "freecom reset called\n");
426 /* We don't really have this feature. */
430 #ifdef CONFIG_USB_STORAGE_DEBUG
431 static void pdump (void *ibuffer, int length)
433 static char line[80];
435 unsigned char *buffer = (unsigned char *) ibuffer;
440 for (i = 0; i < length; i++) {
443 offset += sprintf (line+offset, " - ");
444 for (j = i - 16; j < i; j++) {
445 if (buffer[j] >= 32 && buffer[j] <= 126)
446 line[offset++] = buffer[j];
448 line[offset++] = '.';
451 US_DEBUGP("%s\n", line);
454 offset += sprintf (line+offset, "%08x:", i);
456 else if ((i & 7) == 0) {
457 offset += sprintf (line+offset, " -");
459 offset += sprintf (line+offset, " %02x", buffer[i] & 0xff);
462 /* Add the last "chunk" of data. */
463 from = (length - 1) % 16;
464 base = ((length - 1) / 16) * 16;
466 for (i = from + 1; i < 16; i++)
467 offset += sprintf (line+offset, " ");
469 offset += sprintf (line+offset, " ");
470 offset += sprintf (line+offset, " - ");
472 for (i = 0; i <= from; i++) {
473 if (buffer[base+i] >= 32 && buffer[base+i] <= 126)
474 line[offset++] = buffer[base+i];
476 line[offset++] = '.';
479 US_DEBUGP("%s\n", line);