Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/mchehab/v4l-dvb
[linux-2.6] / drivers / scsi / pluto.c
1 /* pluto.c: SparcSTORAGE Array SCSI host adapter driver.
2  *
3  * Copyright (C) 1997,1998,1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
4  *
5  */
6
7 #include <linux/kernel.h>
8 #include <linux/delay.h>
9 #include <linux/types.h>
10 #include <linux/string.h>
11 #include <linux/slab.h>
12 #include <linux/blkdev.h>
13 #include <linux/proc_fs.h>
14 #include <linux/stat.h>
15 #include <linux/init.h>
16 #ifdef CONFIG_KMOD
17 #include <linux/kmod.h>
18 #endif
19
20 #include <asm/irq.h>
21
22 #include "scsi.h"
23 #include <scsi/scsi_host.h>
24 #include "../fc4/fcp_impl.h"
25 #include "pluto.h"
26
27 #include <linux/module.h>
28
29 #define RQ_SCSI_BUSY            0xffff
30 #define RQ_SCSI_DONE            0xfffe
31
32 /* #define PLUTO_DEBUG */
33
34 #define pluto_printk printk ("PLUTO %s: ", fc->name); printk
35
36 #ifdef PLUTO_DEBUG
37 #define PLD(x)  pluto_printk x;
38 #define PLND(x) printk ("PLUTO: "); printk x;
39 #else
40 #define PLD(x)
41 #define PLND(x)
42 #endif
43
44 static struct ctrl_inquiry {
45         struct Scsi_Host host;
46         struct pluto pluto;
47         Scsi_Cmnd cmd;
48         char inquiry[256];
49         fc_channel *fc;
50 } *fcs __initdata;
51 static int fcscount __initdata = 0;
52 static atomic_t fcss __initdata = ATOMIC_INIT(0);
53 DECLARE_MUTEX_LOCKED(fc_sem);
54
55 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd);
56
57 static void __init pluto_detect_timeout(unsigned long data)
58 {
59         PLND(("Timeout\n"))
60         up(&fc_sem);
61 }
62
63 static void __init pluto_detect_done(Scsi_Cmnd *SCpnt)
64 {
65         /* Do nothing */
66 }
67
68 static void __init pluto_detect_scsi_done(Scsi_Cmnd *SCpnt)
69 {
70         PLND(("Detect done %08lx\n", (long)SCpnt))
71         if (atomic_dec_and_test (&fcss))
72                 up(&fc_sem);
73 }
74
75 int pluto_slave_configure(struct scsi_device *device)
76 {
77         int depth_to_use;
78
79         if (device->tagged_supported)
80                 depth_to_use = /* 254 */ 8;
81         else
82                 depth_to_use = 2;
83
84         scsi_adjust_queue_depth(device,
85                                 (device->tagged_supported ?
86                                  MSG_SIMPLE_TAG : 0),
87                                 depth_to_use);
88
89         return 0;
90 }
91
92 /* Detect all SSAs attached to the machine.
93    To be fast, do it on all online FC channels at the same time. */
94 int __init pluto_detect(struct scsi_host_template *tpnt)
95 {
96         int i, retry, nplutos;
97         fc_channel *fc;
98         struct scsi_device dev;
99         DEFINE_TIMER(fc_timer, pluto_detect_timeout, 0, 0);
100
101         tpnt->proc_name = "pluto";
102         fcscount = 0;
103         for_each_online_fc_channel(fc) {
104                 if (!fc->posmap)
105                         fcscount++;
106         }
107         PLND(("%d channels online\n", fcscount))
108         if (!fcscount) {
109 #if defined(MODULE) && defined(CONFIG_FC4_SOC_MODULE) && defined(CONFIG_KMOD)
110                 request_module("soc");
111                 
112                 for_each_online_fc_channel(fc) {
113                         if (!fc->posmap)
114                                 fcscount++;
115                 }
116                 if (!fcscount)
117 #endif
118                         return 0;
119         }
120         fcs = (struct ctrl_inquiry *) kmalloc (sizeof (struct ctrl_inquiry) * fcscount, GFP_DMA);
121         if (!fcs) {
122                 printk ("PLUTO: Not enough memory to probe\n");
123                 return 0;
124         }
125         
126         memset (fcs, 0, sizeof (struct ctrl_inquiry) * fcscount);
127         memset (&dev, 0, sizeof(dev));
128         atomic_set (&fcss, fcscount);
129         
130         i = 0;
131         for_each_online_fc_channel(fc) {
132                 Scsi_Cmnd *SCpnt;
133                 struct Scsi_Host *host;
134                 struct pluto *pluto;
135
136                 if (i == fcscount) break;
137                 if (fc->posmap) continue;
138                 
139                 PLD(("trying to find SSA\n"))
140
141                 /* If this is already registered to some other SCSI host, then it cannot be pluto */
142                 if (fc->scsi_name[0]) continue;
143                 memcpy (fc->scsi_name, "SSA", 4);
144                 
145                 fcs[i].fc = fc;
146                 
147                 fc->can_queue = PLUTO_CAN_QUEUE;
148                 fc->rsp_size = 64;
149                 fc->encode_addr = pluto_encode_addr;
150                 
151                 fc->fcp_register(fc, TYPE_SCSI_FCP, 0);
152         
153                 SCpnt = &(fcs[i].cmd);
154                 host = &(fcs[i].host);
155                 pluto = (struct pluto *)host->hostdata;
156                 
157                 pluto->fc = fc;
158         
159                 SCpnt->cmnd[0] = INQUIRY;
160                 SCpnt->cmnd[4] = 255;
161                 
162                 /* FC layer requires this, so that SCpnt->device->tagged_supported is initially 0 */
163                 SCpnt->device = &dev;
164                 dev.host = host;
165                 
166                 SCpnt->cmd_len = COMMAND_SIZE(INQUIRY);
167         
168                 SCpnt->request->cmd_flags &= ~REQ_STARTED;
169                 
170                 SCpnt->done = pluto_detect_done;
171                 SCpnt->request_bufflen = 256;
172                 SCpnt->request_buffer = fcs[i].inquiry;
173                 PLD(("set up %d %08lx\n", i, (long)SCpnt))
174                 i++;
175         }
176         
177         for (retry = 0; retry < 5; retry++) {
178                 for (i = 0; i < fcscount; i++) {
179                         if (!fcs[i].fc) break;
180                         if (!(fcs[i].cmd.request->cmd_flags & REQ_STARTED)) {
181                                 fcs[i].cmd.request->cmd_flags |= REQ_STARTED;
182                                 disable_irq(fcs[i].fc->irq);
183                                 PLND(("queuecommand %d %d\n", retry, i))
184                                 fcp_scsi_queuecommand (&(fcs[i].cmd), 
185                                         pluto_detect_scsi_done);
186                                 enable_irq(fcs[i].fc->irq);
187                         }
188                 }
189             
190                 fc_timer.expires = jiffies + 10 * HZ;
191                 add_timer(&fc_timer);
192                 
193                 down(&fc_sem);
194                 PLND(("Woken up\n"))
195                 if (!atomic_read(&fcss))
196                         break; /* All fc channels have answered us */
197         }
198         del_timer_sync(&fc_timer);
199
200         PLND(("Finished search\n"))
201         for (i = 0, nplutos = 0; i < fcscount; i++) {
202                 Scsi_Cmnd *SCpnt;
203                 
204                 if (!(fc = fcs[i].fc)) break;
205         
206                 SCpnt = &(fcs[i].cmd);
207                 
208                 /* Let FC mid-level free allocated resources */
209                 SCpnt->done (SCpnt);
210                 
211                 if (!SCpnt->result) {
212                         struct pluto_inquiry *inq;
213                         struct pluto *pluto;
214                         struct Scsi_Host *host;
215                         
216                         inq = (struct pluto_inquiry *)fcs[i].inquiry;
217
218                         if ((inq->dtype & 0x1f) == TYPE_PROCESSOR &&
219                             !strncmp (inq->vendor_id, "SUN", 3) &&
220                             !strncmp (inq->product_id, "SSA", 3)) {
221                                 char *p;
222                                 long *ages;
223                                 
224                                 ages = kmalloc (((inq->channels + 1) * inq->targets) * sizeof(long), GFP_KERNEL);
225                                 if (!ages) continue;
226                                 
227                                 host = scsi_register (tpnt, sizeof (struct pluto));
228                                 if(!host)
229                                 {
230                                         kfree(ages);
231                                         continue;
232                                 }
233                                 
234                                 if (!try_module_get(fc->module)) {
235                                         kfree(ages);
236                                         scsi_unregister(host);
237                                         continue;
238                                 }
239
240                                 nplutos++;
241                                 
242                                 pluto = (struct pluto *)host->hostdata;
243                                 
244                                 host->max_id = inq->targets;
245                                 host->max_channel = inq->channels;
246                                 host->irq = fc->irq;
247
248                                 fc->channels = inq->channels + 1;
249                                 fc->targets = inq->targets;
250                                 fc->ages = ages;
251                                 memset (ages, 0, ((inq->channels + 1) * inq->targets) * sizeof(long));
252                                 
253                                 pluto->fc = fc;
254                                 memcpy (pluto->rev_str, inq->revision, 4);
255                                 pluto->rev_str[4] = 0;
256                                 p = strchr (pluto->rev_str, ' ');
257                                 if (p) *p = 0;
258                                 memcpy (pluto->fw_rev_str, inq->fw_revision, 4);
259                                 pluto->fw_rev_str[4] = 0;
260                                 p = strchr (pluto->fw_rev_str, ' ');
261                                 if (p) *p = 0;
262                                 memcpy (pluto->serial_str, inq->serial, 12);
263                                 pluto->serial_str[12] = 0;
264                                 p = strchr (pluto->serial_str, ' ');
265                                 if (p) *p = 0;
266                                 
267                                 PLD(("Found SSA rev %s fw rev %s serial %s %dx%d\n", pluto->rev_str, pluto->fw_rev_str, pluto->serial_str, host->max_channel, host->max_id))
268                         } else
269                                 fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
270                 } else
271                         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
272         }
273         kfree((char *)fcs);
274         if (nplutos)
275                 printk ("PLUTO: Total of %d SparcSTORAGE Arrays found\n", nplutos);
276         return nplutos;
277 }
278
279 int pluto_release(struct Scsi_Host *host)
280 {
281         struct pluto *pluto = (struct pluto *)host->hostdata;
282         fc_channel *fc = pluto->fc;
283
284         module_put(fc->module);
285         
286         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
287         PLND((" releasing pluto.\n"));
288         kfree (fc->ages);
289         PLND(("released pluto!\n"));
290         return 0;
291 }
292
293 const char *pluto_info(struct Scsi_Host *host)
294 {
295         static char buf[128], *p;
296         struct pluto *pluto = (struct pluto *) host->hostdata;
297
298         sprintf(buf, "SUN SparcSTORAGE Array %s fw %s serial %s %dx%d on %s",
299                 pluto->rev_str, pluto->fw_rev_str, pluto->serial_str,
300                 host->max_channel, host->max_id, pluto->fc->name);
301 #ifdef __sparc__
302         p = strchr(buf, 0);
303         sprintf(p, " PROM node %x", pluto->fc->dev->prom_node);
304 #endif  
305         return buf;
306 }
307
308 /* SSA uses this FC4S addressing:
309    switch (addr[0])
310    {
311    case 0: CONTROLLER - All of addr[1]..addr[3] has to be 0
312    case 1: SINGLE DISK - addr[1] channel, addr[2] id, addr[3] 0
313    case 2: DISK GROUP - ???
314    }
315    
316    So that SCSI mid-layer can access to these, we reserve
317    channel 0 id 0 lun 0 for CONTROLLER
318    and channels 1 .. max_channel are normal single disks.
319  */
320 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd)
321 {
322         PLND(("encode addr %d %d %d\n", SCpnt->device->channel, SCpnt->device->id, SCpnt->cmnd[1] & 0xe0))
323         /* We don't support LUNs - neither does SSA :) */
324         if (SCpnt->cmnd[1] & 0xe0)
325                 return -EINVAL;
326         if (!SCpnt->device->channel) {
327                 if (SCpnt->device->id)
328                         return -EINVAL;
329                 memset (addr, 0, 4 * sizeof(u16));
330         } else {
331                 addr[0] = 1;
332                 addr[1] = SCpnt->device->channel - 1;
333                 addr[2] = SCpnt->device->id;
334                 addr[3] = 0;
335         }
336         /* We're Point-to-Point, so target it to the default DID */
337         fcmd->did = fc->did;
338         PLND(("trying %04x%04x%04x%04x\n", addr[0], addr[1], addr[2], addr[3]))
339         return 0;
340 }
341
342 static struct scsi_host_template driver_template = {
343         .name                   = "Sparc Storage Array 100/200",
344         .detect                 = pluto_detect,
345         .release                = pluto_release,
346         .info                   = pluto_info,
347         .queuecommand           = fcp_scsi_queuecommand,
348         .slave_configure        = pluto_slave_configure,
349         .can_queue              = PLUTO_CAN_QUEUE,
350         .this_id                = -1,
351         .sg_tablesize           = 1,
352         .cmd_per_lun            = 1,
353         .use_clustering         = ENABLE_CLUSTERING,
354         .eh_abort_handler       = fcp_scsi_abort,
355         .eh_device_reset_handler = fcp_scsi_dev_reset,
356         .eh_host_reset_handler  = fcp_scsi_host_reset,
357 };
358
359 #include "scsi_module.c"
360
361 MODULE_LICENSE("GPL");
362