[SCSI] bnx2fc: Fix MTU issue by using static MTU
[linux-2.6.git] / drivers / scsi / sr_vendor.c
1 /* -*-linux-c-*-
2
3  * vendor-specific code for SCSI CD-ROM's goes here.
4  *
5  * This is needed becauce most of the new features (multisession and
6  * the like) are too new to be included into the SCSI-II standard (to
7  * be exact: there is'nt anything in my draft copy).
8  *
9  * Aug 1997: Ha! Got a SCSI-3 cdrom spec across my fingers. SCSI-3 does
10  *           multisession using the READ TOC command (like SONY).
11  *
12  *           Rearranged stuff here: SCSI-3 is included allways, support
13  *           for NEC/TOSHIBA/HP commands is optional.
14  *
15  *   Gerd Knorr <kraxel@cs.tu-berlin.de> 
16  *
17  * --------------------------------------------------------------------------
18  *
19  * support for XA/multisession-CD's
20  * 
21  *   - NEC:     Detection and support of multisession CD's.
22  *     
23  *   - TOSHIBA: Detection and support of multisession CD's.
24  *              Some XA-Sector tweaking, required for older drives.
25  *
26  *   - SONY:    Detection and support of multisession CD's.
27  *              added by Thomas Quinot <thomas@cuivre.freenix.fr>
28  *
29  *   - PIONEER, HITACHI, PLEXTOR, MATSHITA, TEAC, PHILIPS: known to
30  *              work with SONY (SCSI3 now)  code.
31  *
32  *   - HP:      Much like SONY, but a little different... (Thomas)
33  *              HP-Writers only ??? Maybe other CD-Writers work with this too ?
34  *              HP 6020 writers now supported.
35  */
36
37 #include <linux/cdrom.h>
38 #include <linux/errno.h>
39 #include <linux/string.h>
40 #include <linux/bcd.h>
41 #include <linux/blkdev.h>
42 #include <linux/slab.h>
43
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_cmnd.h>
46 #include <scsi/scsi_device.h>
47 #include <scsi/scsi_host.h>
48 #include <scsi/scsi_ioctl.h>
49
50 #include "sr.h"
51
52 #if 0
53 #define DEBUG
54 #endif
55
56 /* here are some constants to sort the vendors into groups */
57
58 #define VENDOR_SCSI3           1        /* default: scsi-3 mmc */
59
60 #define VENDOR_NEC             2
61 #define VENDOR_TOSHIBA         3
62 #define VENDOR_WRITER          4        /* pre-scsi3 writers */
63
64 #define VENDOR_TIMEOUT  30*HZ
65
66 void sr_vendor_init(Scsi_CD *cd)
67 {
68 #ifndef CONFIG_BLK_DEV_SR_VENDOR
69         cd->vendor = VENDOR_SCSI3;
70 #else
71         const char *vendor = cd->device->vendor;
72         const char *model = cd->device->model;
73         
74         /* default */
75         cd->vendor = VENDOR_SCSI3;
76         if (cd->readcd_known)
77                 /* this is true for scsi3/mmc drives - no more checks */
78                 return;
79
80         if (cd->device->type == TYPE_WORM) {
81                 cd->vendor = VENDOR_WRITER;
82
83         } else if (!strncmp(vendor, "NEC", 3)) {
84                 cd->vendor = VENDOR_NEC;
85                 if (!strncmp(model, "CD-ROM DRIVE:25", 15) ||
86                     !strncmp(model, "CD-ROM DRIVE:36", 15) ||
87                     !strncmp(model, "CD-ROM DRIVE:83", 15) ||
88                     !strncmp(model, "CD-ROM DRIVE:84 ", 16)
89 #if 0
90                 /* my NEC 3x returns the read-raw data if a read-raw
91                    is followed by a read for the same sector - aeb */
92                     || !strncmp(model, "CD-ROM DRIVE:500", 16)
93 #endif
94                     )
95                         /* these can't handle multisession, may hang */
96                         cd->cdi.mask |= CDC_MULTI_SESSION;
97
98         } else if (!strncmp(vendor, "TOSHIBA", 7)) {
99                 cd->vendor = VENDOR_TOSHIBA;
100
101         }
102 #endif
103 }
104
105
106 /* small handy function for switching block length using MODE SELECT,
107  * used by sr_read_sector() */
108
109 int sr_set_blocklength(Scsi_CD *cd, int blocklength)
110 {
111         unsigned char *buffer;  /* the buffer for the ioctl */
112         struct packet_command cgc;
113         struct ccs_modesel_head *modesel;
114         int rc, density = 0;
115
116 #ifdef CONFIG_BLK_DEV_SR_VENDOR
117         if (cd->vendor == VENDOR_TOSHIBA)
118                 density = (blocklength > 2048) ? 0x81 : 0x83;
119 #endif
120
121         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
122         if (!buffer)
123                 return -ENOMEM;
124
125 #ifdef DEBUG
126         printk("%s: MODE SELECT 0x%x/%d\n", cd->cdi.name, density, blocklength);
127 #endif
128         memset(&cgc, 0, sizeof(struct packet_command));
129         cgc.cmd[0] = MODE_SELECT;
130         cgc.cmd[1] = (1 << 4);
131         cgc.cmd[4] = 12;
132         modesel = (struct ccs_modesel_head *) buffer;
133         memset(modesel, 0, sizeof(*modesel));
134         modesel->block_desc_length = 0x08;
135         modesel->density = density;
136         modesel->block_length_med = (blocklength >> 8) & 0xff;
137         modesel->block_length_lo = blocklength & 0xff;
138         cgc.buffer = buffer;
139         cgc.buflen = sizeof(*modesel);
140         cgc.data_direction = DMA_TO_DEVICE;
141         cgc.timeout = VENDOR_TIMEOUT;
142         if (0 == (rc = sr_do_ioctl(cd, &cgc))) {
143                 cd->device->sector_size = blocklength;
144         }
145 #ifdef DEBUG
146         else
147                 printk("%s: switching blocklength to %d bytes failed\n",
148                        cd->cdi.name, blocklength);
149 #endif
150         kfree(buffer);
151         return rc;
152 }
153
154 /* This function gets called after a media change. Checks if the CD is
155    multisession, asks for offset etc. */
156
157 int sr_cd_check(struct cdrom_device_info *cdi)
158 {
159         Scsi_CD *cd = cdi->handle;
160         unsigned long sector;
161         unsigned char *buffer;  /* the buffer for the ioctl */
162         struct packet_command cgc;
163         int rc, no_multi;
164
165         if (cd->cdi.mask & CDC_MULTI_SESSION)
166                 return 0;
167
168         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
169         if (!buffer)
170                 return -ENOMEM;
171
172         sector = 0;             /* the multisession sector offset goes here  */
173         no_multi = 0;           /* flag: the drive can't handle multisession */
174         rc = 0;
175
176         memset(&cgc, 0, sizeof(struct packet_command));
177
178         switch (cd->vendor) {
179
180         case VENDOR_SCSI3:
181                 cgc.cmd[0] = READ_TOC;
182                 cgc.cmd[8] = 12;
183                 cgc.cmd[9] = 0x40;
184                 cgc.buffer = buffer;
185                 cgc.buflen = 12;
186                 cgc.quiet = 1;
187                 cgc.data_direction = DMA_FROM_DEVICE;
188                 cgc.timeout = VENDOR_TIMEOUT;
189                 rc = sr_do_ioctl(cd, &cgc);
190                 if (rc != 0)
191                         break;
192                 if ((buffer[0] << 8) + buffer[1] < 0x0a) {
193                         printk(KERN_INFO "%s: Hmm, seems the drive "
194                            "doesn't support multisession CD's\n", cd->cdi.name);
195                         no_multi = 1;
196                         break;
197                 }
198                 sector = buffer[11] + (buffer[10] << 8) +
199                     (buffer[9] << 16) + (buffer[8] << 24);
200                 if (buffer[6] <= 1) {
201                         /* ignore sector offsets from first track */
202                         sector = 0;
203                 }
204                 break;
205
206 #ifdef CONFIG_BLK_DEV_SR_VENDOR
207         case VENDOR_NEC:{
208                         unsigned long min, sec, frame;
209                         cgc.cmd[0] = 0xde;
210                         cgc.cmd[1] = 0x03;
211                         cgc.cmd[2] = 0xb0;
212                         cgc.buffer = buffer;
213                         cgc.buflen = 0x16;
214                         cgc.quiet = 1;
215                         cgc.data_direction = DMA_FROM_DEVICE;
216                         cgc.timeout = VENDOR_TIMEOUT;
217                         rc = sr_do_ioctl(cd, &cgc);
218                         if (rc != 0)
219                                 break;
220                         if (buffer[14] != 0 && buffer[14] != 0xb0) {
221                                 printk(KERN_INFO "%s: Hmm, seems the cdrom "
222                                        "doesn't support multisession CD's\n",
223                                        cd->cdi.name);
224                                 no_multi = 1;
225                                 break;
226                         }
227                         min = bcd2bin(buffer[15]);
228                         sec = bcd2bin(buffer[16]);
229                         frame = bcd2bin(buffer[17]);
230                         sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
231                         break;
232                 }
233
234         case VENDOR_TOSHIBA:{
235                         unsigned long min, sec, frame;
236
237                         /* we request some disc information (is it a XA-CD ?,
238                          * where starts the last session ?) */
239                         cgc.cmd[0] = 0xc7;
240                         cgc.cmd[1] = 0x03;
241                         cgc.buffer = buffer;
242                         cgc.buflen = 4;
243                         cgc.quiet = 1;
244                         cgc.data_direction = DMA_FROM_DEVICE;
245                         cgc.timeout = VENDOR_TIMEOUT;
246                         rc = sr_do_ioctl(cd, &cgc);
247                         if (rc == -EINVAL) {
248                                 printk(KERN_INFO "%s: Hmm, seems the drive "
249                                        "doesn't support multisession CD's\n",
250                                        cd->cdi.name);
251                                 no_multi = 1;
252                                 break;
253                         }
254                         if (rc != 0)
255                                 break;
256                         min = bcd2bin(buffer[1]);
257                         sec = bcd2bin(buffer[2]);
258                         frame = bcd2bin(buffer[3]);
259                         sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
260                         if (sector)
261                                 sector -= CD_MSF_OFFSET;
262                         sr_set_blocklength(cd, 2048);
263                         break;
264                 }
265
266         case VENDOR_WRITER:
267                 cgc.cmd[0] = READ_TOC;
268                 cgc.cmd[8] = 0x04;
269                 cgc.cmd[9] = 0x40;
270                 cgc.buffer = buffer;
271                 cgc.buflen = 0x04;
272                 cgc.quiet = 1;
273                 cgc.data_direction = DMA_FROM_DEVICE;
274                 cgc.timeout = VENDOR_TIMEOUT;
275                 rc = sr_do_ioctl(cd, &cgc);
276                 if (rc != 0) {
277                         break;
278                 }
279                 if ((rc = buffer[2]) == 0) {
280                         printk(KERN_WARNING
281                                "%s: No finished session\n", cd->cdi.name);
282                         break;
283                 }
284                 cgc.cmd[0] = READ_TOC;  /* Read TOC */
285                 cgc.cmd[6] = rc & 0x7f; /* number of last session */
286                 cgc.cmd[8] = 0x0c;
287                 cgc.cmd[9] = 0x40;
288                 cgc.buffer = buffer;
289                 cgc.buflen = 12;
290                 cgc.quiet = 1;
291                 cgc.data_direction = DMA_FROM_DEVICE;
292                 cgc.timeout = VENDOR_TIMEOUT;
293                 rc = sr_do_ioctl(cd, &cgc);
294                 if (rc != 0) {
295                         break;
296                 }
297                 sector = buffer[11] + (buffer[10] << 8) +
298                     (buffer[9] << 16) + (buffer[8] << 24);
299                 break;
300 #endif                          /* CONFIG_BLK_DEV_SR_VENDOR */
301
302         default:
303                 /* should not happen */
304                 printk(KERN_WARNING
305                    "%s: unknown vendor code (%i), not initialized ?\n",
306                        cd->cdi.name, cd->vendor);
307                 sector = 0;
308                 no_multi = 1;
309                 break;
310         }
311         cd->ms_offset = sector;
312         cd->xa_flag = 0;
313         if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(cd))
314                 cd->xa_flag = 1;
315
316         if (2048 != cd->device->sector_size) {
317                 sr_set_blocklength(cd, 2048);
318         }
319         if (no_multi)
320                 cdi->mask |= CDC_MULTI_SESSION;
321
322 #ifdef DEBUG
323         if (sector)
324                 printk(KERN_DEBUG "%s: multisession offset=%lu\n",
325                        cd->cdi.name, sector);
326 #endif
327         kfree(buffer);
328         return rc;
329 }