ieee1394: remove old isochronous ABI
[linux-2.6.git] / drivers / ieee1394 / highlevel.c
1 /*
2  * IEEE 1394 for Linux
3  *
4  * Copyright (C) 1999 Andreas E. Bombe
5  *
6  * This code is licensed under the GPL.  See the file COPYING in the root
7  * directory of the kernel sources for details.
8  *
9  *
10  * Contributions:
11  *
12  * Christian Toegel <christian.toegel@gmx.at>
13  *        unregister address space
14  *
15  * Manfred Weihs <weihs@ict.tuwien.ac.at>
16  *        unregister address space
17  *
18  */
19
20 #include <linux/slab.h>
21 #include <linux/list.h>
22 #include <linux/bitops.h>
23
24 #include "ieee1394.h"
25 #include "ieee1394_types.h"
26 #include "hosts.h"
27 #include "ieee1394_core.h"
28 #include "highlevel.h"
29 #include "nodemgr.h"
30
31
32 struct hl_host_info {
33         struct list_head list;
34         struct hpsb_host *host;
35         size_t size;
36         unsigned long key;
37         void *data;
38 };
39
40
41 static LIST_HEAD(hl_drivers);
42 static DECLARE_RWSEM(hl_drivers_sem);
43
44 static LIST_HEAD(hl_irqs);
45 static DEFINE_RWLOCK(hl_irqs_lock);
46
47 static DEFINE_RWLOCK(addr_space_lock);
48
49 /* addr_space list will have zero and max already included as bounds */
50 static struct hpsb_address_ops dummy_ops = { NULL, NULL, NULL, NULL };
51 static struct hpsb_address_serve dummy_zero_addr, dummy_max_addr;
52
53
54 static struct hl_host_info *hl_get_hostinfo(struct hpsb_highlevel *hl,
55                                             struct hpsb_host *host)
56 {
57         struct hl_host_info *hi = NULL;
58
59         if (!hl || !host)
60                 return NULL;
61
62         read_lock(&hl->host_info_lock);
63         list_for_each_entry(hi, &hl->host_info_list, list) {
64                 if (hi->host == host) {
65                         read_unlock(&hl->host_info_lock);
66                         return hi;
67                 }
68         }
69         read_unlock(&hl->host_info_lock);
70         return NULL;
71 }
72
73 /**
74  * hpsb_get_hostinfo - retrieve a hostinfo pointer bound to this driver/host
75  *
76  * Returns a per @host and @hl driver data structure that was previously stored
77  * by hpsb_create_hostinfo.
78  */
79 void *hpsb_get_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
80 {
81         struct hl_host_info *hi = hl_get_hostinfo(hl, host);
82
83         return hi ? hi->data : NULL;
84 }
85
86 /**
87  * hpsb_create_hostinfo - allocate a hostinfo pointer bound to this driver/host
88  *
89  * Allocate a hostinfo pointer backed by memory with @data_size and bind it to
90  * to this @hl driver and @host.  If @data_size is zero, then the return here is
91  * only valid for error checking.
92  */
93 void *hpsb_create_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
94                            size_t data_size)
95 {
96         struct hl_host_info *hi;
97         void *data;
98         unsigned long flags;
99
100         hi = hl_get_hostinfo(hl, host);
101         if (hi) {
102                 HPSB_ERR("%s called hpsb_create_hostinfo when hostinfo already"
103                          " exists", hl->name);
104                 return NULL;
105         }
106
107         hi = kzalloc(sizeof(*hi) + data_size, GFP_ATOMIC);
108         if (!hi)
109                 return NULL;
110
111         if (data_size) {
112                 data = hi->data = hi + 1;
113                 hi->size = data_size;
114         } else
115                 data = hi;
116
117         hi->host = host;
118
119         write_lock_irqsave(&hl->host_info_lock, flags);
120         list_add_tail(&hi->list, &hl->host_info_list);
121         write_unlock_irqrestore(&hl->host_info_lock, flags);
122
123         return data;
124 }
125
126 /**
127  * hpsb_set_hostinfo - set the hostinfo pointer to something useful
128  *
129  * Usually follows a call to hpsb_create_hostinfo, where the size is 0.
130  */
131 int hpsb_set_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
132                       void *data)
133 {
134         struct hl_host_info *hi;
135
136         hi = hl_get_hostinfo(hl, host);
137         if (hi) {
138                 if (!hi->size && !hi->data) {
139                         hi->data = data;
140                         return 0;
141                 } else
142                         HPSB_ERR("%s called hpsb_set_hostinfo when hostinfo "
143                                  "already has data", hl->name);
144         } else
145                 HPSB_ERR("%s called hpsb_set_hostinfo when no hostinfo exists",
146                          hl->name);
147         return -EINVAL;
148 }
149
150 /**
151  * hpsb_destroy_hostinfo - free and remove a hostinfo pointer
152  *
153  * Free and remove the hostinfo pointer bound to this @hl driver and @host.
154  */
155 void hpsb_destroy_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
156 {
157         struct hl_host_info *hi;
158
159         hi = hl_get_hostinfo(hl, host);
160         if (hi) {
161                 unsigned long flags;
162                 write_lock_irqsave(&hl->host_info_lock, flags);
163                 list_del(&hi->list);
164                 write_unlock_irqrestore(&hl->host_info_lock, flags);
165                 kfree(hi);
166         }
167         return;
168 }
169
170 /**
171  * hpsb_set_hostinfo_key - set an alternate lookup key for an hostinfo
172  *
173  * Sets an alternate lookup key for the hostinfo bound to this @hl driver and
174  * @host.
175  */
176 void hpsb_set_hostinfo_key(struct hpsb_highlevel *hl, struct hpsb_host *host,
177                            unsigned long key)
178 {
179         struct hl_host_info *hi;
180
181         hi = hl_get_hostinfo(hl, host);
182         if (hi)
183                 hi->key = key;
184         return;
185 }
186
187 /**
188  * hpsb_get_hostinfo_bykey - retrieve a hostinfo pointer by its alternate key
189  */
190 void *hpsb_get_hostinfo_bykey(struct hpsb_highlevel *hl, unsigned long key)
191 {
192         struct hl_host_info *hi;
193         void *data = NULL;
194
195         if (!hl)
196                 return NULL;
197
198         read_lock(&hl->host_info_lock);
199         list_for_each_entry(hi, &hl->host_info_list, list) {
200                 if (hi->key == key) {
201                         data = hi->data;
202                         break;
203                 }
204         }
205         read_unlock(&hl->host_info_lock);
206         return data;
207 }
208
209 static int highlevel_for_each_host_reg(struct hpsb_host *host, void *__data)
210 {
211         struct hpsb_highlevel *hl = __data;
212
213         hl->add_host(host);
214
215         if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
216                 HPSB_ERR("Failed to generate Configuration ROM image for host "
217                          "%s-%d", hl->name, host->id);
218         return 0;
219 }
220
221 /**
222  * hpsb_register_highlevel - register highlevel driver
223  *
224  * The name pointer in @hl has to stay valid at all times because the string is
225  * not copied.
226  */
227 void hpsb_register_highlevel(struct hpsb_highlevel *hl)
228 {
229         unsigned long flags;
230
231         INIT_LIST_HEAD(&hl->addr_list);
232         INIT_LIST_HEAD(&hl->host_info_list);
233
234         rwlock_init(&hl->host_info_lock);
235
236         down_write(&hl_drivers_sem);
237         list_add_tail(&hl->hl_list, &hl_drivers);
238         up_write(&hl_drivers_sem);
239
240         write_lock_irqsave(&hl_irqs_lock, flags);
241         list_add_tail(&hl->irq_list, &hl_irqs);
242         write_unlock_irqrestore(&hl_irqs_lock, flags);
243
244         if (hl->add_host)
245                 nodemgr_for_each_host(hl, highlevel_for_each_host_reg);
246         return;
247 }
248
249 static void __delete_addr(struct hpsb_address_serve *as)
250 {
251         list_del(&as->host_list);
252         list_del(&as->hl_list);
253         kfree(as);
254 }
255
256 static void __unregister_host(struct hpsb_highlevel *hl, struct hpsb_host *host,
257                               int update_cr)
258 {
259         unsigned long flags;
260         struct list_head *lh, *next;
261         struct hpsb_address_serve *as;
262
263         /* First, let the highlevel driver unreg */
264         if (hl->remove_host)
265                 hl->remove_host(host);
266
267         /* Remove any addresses that are matched for this highlevel driver
268          * and this particular host. */
269         write_lock_irqsave(&addr_space_lock, flags);
270         list_for_each_safe (lh, next, &hl->addr_list) {
271                 as = list_entry(lh, struct hpsb_address_serve, hl_list);
272                 if (as->host == host)
273                         __delete_addr(as);
274         }
275         write_unlock_irqrestore(&addr_space_lock, flags);
276
277         /* Now update the config-rom to reflect anything removed by the
278          * highlevel driver. */
279         if (update_cr && host->update_config_rom &&
280             hpsb_update_config_rom_image(host) < 0)
281                 HPSB_ERR("Failed to generate Configuration ROM image for host "
282                          "%s-%d", hl->name, host->id);
283
284         /* Finally remove all the host info associated between these two. */
285         hpsb_destroy_hostinfo(hl, host);
286 }
287
288 static int highlevel_for_each_host_unreg(struct hpsb_host *host, void *__data)
289 {
290         struct hpsb_highlevel *hl = __data;
291
292         __unregister_host(hl, host, 1);
293         return 0;
294 }
295
296 /**
297  * hpsb_unregister_highlevel - unregister highlevel driver
298  */
299 void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
300 {
301         unsigned long flags;
302
303         write_lock_irqsave(&hl_irqs_lock, flags);
304         list_del(&hl->irq_list);
305         write_unlock_irqrestore(&hl_irqs_lock, flags);
306
307         down_write(&hl_drivers_sem);
308         list_del(&hl->hl_list);
309         up_write(&hl_drivers_sem);
310
311         nodemgr_for_each_host(hl, highlevel_for_each_host_unreg);
312 }
313
314 /**
315  * hpsb_allocate_and_register_addrspace - alloc' and reg' a host address space
316  *
317  * @start and @end are 48 bit pointers and have to be quadlet aligned.
318  * @end points to the first address behind the handled addresses.  This
319  * function can be called multiple times for a single hpsb_highlevel @hl to
320  * implement sparse register sets.  The requested region must not overlap any
321  * previously allocated region, otherwise registering will fail.
322  *
323  * It returns true for successful allocation.  Address spaces can be
324  * unregistered with hpsb_unregister_addrspace.  All remaining address spaces
325  * are automatically deallocated together with the hpsb_highlevel @hl.
326  */
327 u64 hpsb_allocate_and_register_addrspace(struct hpsb_highlevel *hl,
328                                          struct hpsb_host *host,
329                                          struct hpsb_address_ops *ops,
330                                          u64 size, u64 alignment,
331                                          u64 start, u64 end)
332 {
333         struct hpsb_address_serve *as, *a1, *a2;
334         struct list_head *entry;
335         u64 retval = CSR1212_INVALID_ADDR_SPACE;
336         unsigned long flags;
337         u64 align_mask = ~(alignment - 1);
338
339         if ((alignment & 3) || (alignment > 0x800000000000ULL) ||
340             (hweight64(alignment) != 1)) {
341                 HPSB_ERR("%s called with invalid alignment: 0x%048llx",
342                          __FUNCTION__, (unsigned long long)alignment);
343                 return retval;
344         }
345
346         /* default range,
347          * avoids controller's posted write area (see OHCI 1.1 clause 1.5) */
348         if (start == CSR1212_INVALID_ADDR_SPACE &&
349             end   == CSR1212_INVALID_ADDR_SPACE) {
350                 start = host->middle_addr_space;
351                 end   = CSR1212_ALL_SPACE_END;
352         }
353
354         if (((start|end) & ~align_mask) || (start >= end) ||
355             (end > CSR1212_ALL_SPACE_END)) {
356                 HPSB_ERR("%s called with invalid addresses "
357                          "(start = %012Lx  end = %012Lx)", __FUNCTION__,
358                          (unsigned long long)start,(unsigned long long)end);
359                 return retval;
360         }
361
362         as = kmalloc(sizeof(*as), GFP_KERNEL);
363         if (!as)
364                 return retval;
365
366         INIT_LIST_HEAD(&as->host_list);
367         INIT_LIST_HEAD(&as->hl_list);
368         as->op = ops;
369         as->host = host;
370
371         write_lock_irqsave(&addr_space_lock, flags);
372         list_for_each(entry, &host->addr_space) {
373                 u64 a1sa, a1ea;
374                 u64 a2sa, a2ea;
375
376                 a1 = list_entry(entry, struct hpsb_address_serve, host_list);
377                 a2 = list_entry(entry->next, struct hpsb_address_serve,
378                                 host_list);
379
380                 a1sa = a1->start & align_mask;
381                 a1ea = (a1->end + alignment -1) & align_mask;
382                 a2sa = a2->start & align_mask;
383                 a2ea = (a2->end + alignment -1) & align_mask;
384
385                 if ((a2sa - a1ea >= size) && (a2sa - start >= size) &&
386                     (a2sa > start)) {
387                         as->start = max(start, a1ea);
388                         as->end = as->start + size;
389                         list_add(&as->host_list, entry);
390                         list_add_tail(&as->hl_list, &hl->addr_list);
391                         retval = as->start;
392                         break;
393                 }
394         }
395         write_unlock_irqrestore(&addr_space_lock, flags);
396
397         if (retval == CSR1212_INVALID_ADDR_SPACE)
398                 kfree(as);
399         return retval;
400 }
401
402 /**
403  * hpsb_register_addrspace - register a host address space
404  *
405  * @start and @end are 48 bit pointers and have to be quadlet aligned.
406  * @end points to the first address behind the handled addresses.  This
407  * function can be called multiple times for a single hpsb_highlevel @hl to
408  * implement sparse register sets.  The requested region must not overlap any
409  * previously allocated region, otherwise registering will fail.
410  *
411  * It returns true for successful allocation.  Address spaces can be
412  * unregistered with hpsb_unregister_addrspace.  All remaining address spaces
413  * are automatically deallocated together with the hpsb_highlevel @hl.
414  */
415 int hpsb_register_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
416                             struct hpsb_address_ops *ops, u64 start, u64 end)
417 {
418         struct hpsb_address_serve *as;
419         struct list_head *lh;
420         int retval = 0;
421         unsigned long flags;
422
423         if (((start|end) & 3) || (start >= end) ||
424             (end > CSR1212_ALL_SPACE_END)) {
425                 HPSB_ERR("%s called with invalid addresses", __FUNCTION__);
426                 return 0;
427         }
428
429         as = kmalloc(sizeof(*as), GFP_ATOMIC);
430         if (!as)
431                 return 0;
432
433         INIT_LIST_HEAD(&as->host_list);
434         INIT_LIST_HEAD(&as->hl_list);
435         as->op = ops;
436         as->start = start;
437         as->end = end;
438         as->host = host;
439
440         write_lock_irqsave(&addr_space_lock, flags);
441         list_for_each(lh, &host->addr_space) {
442                 struct hpsb_address_serve *as_this =
443                         list_entry(lh, struct hpsb_address_serve, host_list);
444                 struct hpsb_address_serve *as_next =
445                         list_entry(lh->next, struct hpsb_address_serve,
446                                    host_list);
447
448                 if (as_this->end > as->start)
449                         break;
450
451                 if (as_next->start >= as->end) {
452                         list_add(&as->host_list, lh);
453                         list_add_tail(&as->hl_list, &hl->addr_list);
454                         retval = 1;
455                         break;
456                 }
457         }
458         write_unlock_irqrestore(&addr_space_lock, flags);
459
460         if (retval == 0)
461                 kfree(as);
462         return retval;
463 }
464
465 int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
466                               u64 start)
467 {
468         int retval = 0;
469         struct hpsb_address_serve *as;
470         struct list_head *lh, *next;
471         unsigned long flags;
472
473         write_lock_irqsave(&addr_space_lock, flags);
474         list_for_each_safe (lh, next, &hl->addr_list) {
475                 as = list_entry(lh, struct hpsb_address_serve, hl_list);
476                 if (as->start == start && as->host == host) {
477                         __delete_addr(as);
478                         retval = 1;
479                         break;
480                 }
481         }
482         write_unlock_irqrestore(&addr_space_lock, flags);
483         return retval;
484 }
485
486 static void init_hpsb_highlevel(struct hpsb_host *host)
487 {
488         INIT_LIST_HEAD(&dummy_zero_addr.host_list);
489         INIT_LIST_HEAD(&dummy_zero_addr.hl_list);
490         INIT_LIST_HEAD(&dummy_max_addr.host_list);
491         INIT_LIST_HEAD(&dummy_max_addr.hl_list);
492
493         dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;
494
495         dummy_zero_addr.start = dummy_zero_addr.end = 0;
496         dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;
497
498         list_add_tail(&dummy_zero_addr.host_list, &host->addr_space);
499         list_add_tail(&dummy_max_addr.host_list, &host->addr_space);
500 }
501
502 void highlevel_add_host(struct hpsb_host *host)
503 {
504         struct hpsb_highlevel *hl;
505
506         init_hpsb_highlevel(host);
507
508         down_read(&hl_drivers_sem);
509         list_for_each_entry(hl, &hl_drivers, hl_list) {
510                 if (hl->add_host)
511                         hl->add_host(host);
512         }
513         up_read(&hl_drivers_sem);
514         if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
515                 HPSB_ERR("Failed to generate Configuration ROM image for host "
516                          "%s-%d", hl->name, host->id);
517 }
518
519 void highlevel_remove_host(struct hpsb_host *host)
520 {
521         struct hpsb_highlevel *hl;
522
523         down_read(&hl_drivers_sem);
524         list_for_each_entry(hl, &hl_drivers, hl_list)
525                 __unregister_host(hl, host, 0);
526         up_read(&hl_drivers_sem);
527 }
528
529 void highlevel_host_reset(struct hpsb_host *host)
530 {
531         unsigned long flags;
532         struct hpsb_highlevel *hl;
533
534         read_lock_irqsave(&hl_irqs_lock, flags);
535         list_for_each_entry(hl, &hl_irqs, irq_list) {
536                 if (hl->host_reset)
537                         hl->host_reset(host);
538         }
539         read_unlock_irqrestore(&hl_irqs_lock, flags);
540 }
541
542 void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
543                            void *data, size_t length)
544 {
545         unsigned long flags;
546         struct hpsb_highlevel *hl;
547         int cts = ((quadlet_t *)data)[0] >> 4;
548
549         read_lock_irqsave(&hl_irqs_lock, flags);
550         list_for_each_entry(hl, &hl_irqs, irq_list) {
551                 if (hl->fcp_request)
552                         hl->fcp_request(host, nodeid, direction, cts, data,
553                                         length);
554         }
555         read_unlock_irqrestore(&hl_irqs_lock, flags);
556 }
557
558 /*
559  * highlevel_read, highlevel_write, highlevel_lock, highlevel_lock64:
560  *
561  * These functions are called to handle transactions. They are called when a
562  * packet arrives.  The flags argument contains the second word of the first
563  * header quadlet of the incoming packet (containing transaction label, retry
564  * code, transaction code and priority).  These functions either return a
565  * response code or a negative number.  In the first case a response will be
566  * generated.  In the latter case, no response will be sent and the driver which
567  * handled the request will send the response itself.
568  */
569 int highlevel_read(struct hpsb_host *host, int nodeid, void *data, u64 addr,
570                    unsigned int length, u16 flags)
571 {
572         struct hpsb_address_serve *as;
573         unsigned int partlength;
574         int rcode = RCODE_ADDRESS_ERROR;
575
576         read_lock(&addr_space_lock);
577         list_for_each_entry(as, &host->addr_space, host_list) {
578                 if (as->start > addr)
579                         break;
580
581                 if (as->end > addr) {
582                         partlength = min(as->end - addr, (u64) length);
583
584                         if (as->op->read)
585                                 rcode = as->op->read(host, nodeid, data,
586                                                      addr, partlength, flags);
587                         else
588                                 rcode = RCODE_TYPE_ERROR;
589
590                         data += partlength;
591                         length -= partlength;
592                         addr += partlength;
593
594                         if ((rcode != RCODE_COMPLETE) || !length)
595                                 break;
596                 }
597         }
598         read_unlock(&addr_space_lock);
599
600         if (length && (rcode == RCODE_COMPLETE))
601                 rcode = RCODE_ADDRESS_ERROR;
602         return rcode;
603 }
604
605 int highlevel_write(struct hpsb_host *host, int nodeid, int destid, void *data,
606                     u64 addr, unsigned int length, u16 flags)
607 {
608         struct hpsb_address_serve *as;
609         unsigned int partlength;
610         int rcode = RCODE_ADDRESS_ERROR;
611
612         read_lock(&addr_space_lock);
613         list_for_each_entry(as, &host->addr_space, host_list) {
614                 if (as->start > addr)
615                         break;
616
617                 if (as->end > addr) {
618                         partlength = min(as->end - addr, (u64) length);
619
620                         if (as->op->write)
621                                 rcode = as->op->write(host, nodeid, destid,
622                                                       data, addr, partlength,
623                                                       flags);
624                         else
625                                 rcode = RCODE_TYPE_ERROR;
626
627                         data += partlength;
628                         length -= partlength;
629                         addr += partlength;
630
631                         if ((rcode != RCODE_COMPLETE) || !length)
632                                 break;
633                 }
634         }
635         read_unlock(&addr_space_lock);
636
637         if (length && (rcode == RCODE_COMPLETE))
638                 rcode = RCODE_ADDRESS_ERROR;
639         return rcode;
640 }
641
642 int highlevel_lock(struct hpsb_host *host, int nodeid, quadlet_t *store,
643                    u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode,
644                    u16 flags)
645 {
646         struct hpsb_address_serve *as;
647         int rcode = RCODE_ADDRESS_ERROR;
648
649         read_lock(&addr_space_lock);
650         list_for_each_entry(as, &host->addr_space, host_list) {
651                 if (as->start > addr)
652                         break;
653
654                 if (as->end > addr) {
655                         if (as->op->lock)
656                                 rcode = as->op->lock(host, nodeid, store, addr,
657                                                      data, arg, ext_tcode,
658                                                      flags);
659                         else
660                                 rcode = RCODE_TYPE_ERROR;
661                         break;
662                 }
663         }
664         read_unlock(&addr_space_lock);
665         return rcode;
666 }
667
668 int highlevel_lock64(struct hpsb_host *host, int nodeid, octlet_t *store,
669                      u64 addr, octlet_t data, octlet_t arg, int ext_tcode,
670                      u16 flags)
671 {
672         struct hpsb_address_serve *as;
673         int rcode = RCODE_ADDRESS_ERROR;
674
675         read_lock(&addr_space_lock);
676
677         list_for_each_entry(as, &host->addr_space, host_list) {
678                 if (as->start > addr)
679                         break;
680
681                 if (as->end > addr) {
682                         if (as->op->lock64)
683                                 rcode = as->op->lock64(host, nodeid, store,
684                                                        addr, data, arg,
685                                                        ext_tcode, flags);
686                         else
687                                 rcode = RCODE_TYPE_ERROR;
688                         break;
689                 }
690         }
691         read_unlock(&addr_space_lock);
692         return rcode;
693 }