Merge branch 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6
[linux-2.6] / drivers / ssb / main.c
1 /*
2  * Sonics Silicon Backplane
3  * Subsystem core
4  *
5  * Copyright 2005, Broadcom Corporation
6  * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
7  *
8  * Licensed under the GNU/GPL. See COPYING for details.
9  */
10
11 #include "ssb_private.h"
12
13 #include <linux/delay.h>
14 #include <linux/io.h>
15 #include <linux/ssb/ssb.h>
16 #include <linux/ssb/ssb_regs.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/pci.h>
19
20 #include <pcmcia/cs_types.h>
21 #include <pcmcia/cs.h>
22 #include <pcmcia/cistpl.h>
23 #include <pcmcia/ds.h>
24
25
26 MODULE_DESCRIPTION("Sonics Silicon Backplane driver");
27 MODULE_LICENSE("GPL");
28
29
30 /* Temporary list of yet-to-be-attached buses */
31 static LIST_HEAD(attach_queue);
32 /* List if running buses */
33 static LIST_HEAD(buses);
34 /* Software ID counter */
35 static unsigned int next_busnumber;
36 /* buses_mutes locks the two buslists and the next_busnumber.
37  * Don't lock this directly, but use ssb_buses_[un]lock() below. */
38 static DEFINE_MUTEX(buses_mutex);
39
40 /* There are differences in the codeflow, if the bus is
41  * initialized from early boot, as various needed services
42  * are not available early. This is a mechanism to delay
43  * these initializations to after early boot has finished.
44  * It's also used to avoid mutex locking, as that's not
45  * available and needed early. */
46 static bool ssb_is_early_boot = 1;
47
48 static void ssb_buses_lock(void);
49 static void ssb_buses_unlock(void);
50
51
52 #ifdef CONFIG_SSB_PCIHOST
53 struct ssb_bus *ssb_pci_dev_to_bus(struct pci_dev *pdev)
54 {
55         struct ssb_bus *bus;
56
57         ssb_buses_lock();
58         list_for_each_entry(bus, &buses, list) {
59                 if (bus->bustype == SSB_BUSTYPE_PCI &&
60                     bus->host_pci == pdev)
61                         goto found;
62         }
63         bus = NULL;
64 found:
65         ssb_buses_unlock();
66
67         return bus;
68 }
69 #endif /* CONFIG_SSB_PCIHOST */
70
71 static struct ssb_device *ssb_device_get(struct ssb_device *dev)
72 {
73         if (dev)
74                 get_device(dev->dev);
75         return dev;
76 }
77
78 static void ssb_device_put(struct ssb_device *dev)
79 {
80         if (dev)
81                 put_device(dev->dev);
82 }
83
84 static int ssb_bus_resume(struct ssb_bus *bus)
85 {
86         int err;
87
88         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
89         err = ssb_pcmcia_init(bus);
90         if (err) {
91                 /* No need to disable XTAL, as we don't have one on PCMCIA. */
92                 return err;
93         }
94         ssb_chipco_resume(&bus->chipco);
95
96         return 0;
97 }
98
99 static int ssb_device_resume(struct device *dev)
100 {
101         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
102         struct ssb_driver *ssb_drv;
103         struct ssb_bus *bus;
104         int err = 0;
105
106         bus = ssb_dev->bus;
107         if (bus->suspend_cnt == bus->nr_devices) {
108                 err = ssb_bus_resume(bus);
109                 if (err)
110                         return err;
111         }
112         bus->suspend_cnt--;
113         if (dev->driver) {
114                 ssb_drv = drv_to_ssb_drv(dev->driver);
115                 if (ssb_drv && ssb_drv->resume)
116                         err = ssb_drv->resume(ssb_dev);
117                 if (err)
118                         goto out;
119         }
120 out:
121         return err;
122 }
123
124 static void ssb_bus_suspend(struct ssb_bus *bus, pm_message_t state)
125 {
126         ssb_chipco_suspend(&bus->chipco, state);
127         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
128
129         /* Reset HW state information in memory, so that HW is
130          * completely reinitialized on resume. */
131         bus->mapped_device = NULL;
132 #ifdef CONFIG_SSB_DRIVER_PCICORE
133         bus->pcicore.setup_done = 0;
134 #endif
135 #ifdef CONFIG_SSB_DEBUG
136         bus->powered_up = 0;
137 #endif
138 }
139
140 static int ssb_device_suspend(struct device *dev, pm_message_t state)
141 {
142         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
143         struct ssb_driver *ssb_drv;
144         struct ssb_bus *bus;
145         int err = 0;
146
147         if (dev->driver) {
148                 ssb_drv = drv_to_ssb_drv(dev->driver);
149                 if (ssb_drv && ssb_drv->suspend)
150                         err = ssb_drv->suspend(ssb_dev, state);
151                 if (err)
152                         goto out;
153         }
154
155         bus = ssb_dev->bus;
156         bus->suspend_cnt++;
157         if (bus->suspend_cnt == bus->nr_devices) {
158                 /* All devices suspended. Shutdown the bus. */
159                 ssb_bus_suspend(bus, state);
160         }
161
162 out:
163         return err;
164 }
165
166 #ifdef CONFIG_SSB_PCIHOST
167 int ssb_devices_freeze(struct ssb_bus *bus)
168 {
169         struct ssb_device *dev;
170         struct ssb_driver *drv;
171         int err = 0;
172         int i;
173         pm_message_t state = PMSG_FREEZE;
174
175         /* First check that we are capable to freeze all devices. */
176         for (i = 0; i < bus->nr_devices; i++) {
177                 dev = &(bus->devices[i]);
178                 if (!dev->dev ||
179                     !dev->dev->driver ||
180                     !device_is_registered(dev->dev))
181                         continue;
182                 drv = drv_to_ssb_drv(dev->dev->driver);
183                 if (!drv)
184                         continue;
185                 if (!drv->suspend) {
186                         /* Nope, can't suspend this one. */
187                         return -EOPNOTSUPP;
188                 }
189         }
190         /* Now suspend all devices */
191         for (i = 0; i < bus->nr_devices; i++) {
192                 dev = &(bus->devices[i]);
193                 if (!dev->dev ||
194                     !dev->dev->driver ||
195                     !device_is_registered(dev->dev))
196                         continue;
197                 drv = drv_to_ssb_drv(dev->dev->driver);
198                 if (!drv)
199                         continue;
200                 err = drv->suspend(dev, state);
201                 if (err) {
202                         ssb_printk(KERN_ERR PFX "Failed to freeze device %s\n",
203                                    dev->dev->bus_id);
204                         goto err_unwind;
205                 }
206         }
207
208         return 0;
209 err_unwind:
210         for (i--; i >= 0; i--) {
211                 dev = &(bus->devices[i]);
212                 if (!dev->dev ||
213                     !dev->dev->driver ||
214                     !device_is_registered(dev->dev))
215                         continue;
216                 drv = drv_to_ssb_drv(dev->dev->driver);
217                 if (!drv)
218                         continue;
219                 if (drv->resume)
220                         drv->resume(dev);
221         }
222         return err;
223 }
224
225 int ssb_devices_thaw(struct ssb_bus *bus)
226 {
227         struct ssb_device *dev;
228         struct ssb_driver *drv;
229         int err;
230         int i;
231
232         for (i = 0; i < bus->nr_devices; i++) {
233                 dev = &(bus->devices[i]);
234                 if (!dev->dev ||
235                     !dev->dev->driver ||
236                     !device_is_registered(dev->dev))
237                         continue;
238                 drv = drv_to_ssb_drv(dev->dev->driver);
239                 if (!drv)
240                         continue;
241                 if (SSB_WARN_ON(!drv->resume))
242                         continue;
243                 err = drv->resume(dev);
244                 if (err) {
245                         ssb_printk(KERN_ERR PFX "Failed to thaw device %s\n",
246                                    dev->dev->bus_id);
247                 }
248         }
249
250         return 0;
251 }
252 #endif /* CONFIG_SSB_PCIHOST */
253
254 static void ssb_device_shutdown(struct device *dev)
255 {
256         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
257         struct ssb_driver *ssb_drv;
258
259         if (!dev->driver)
260                 return;
261         ssb_drv = drv_to_ssb_drv(dev->driver);
262         if (ssb_drv && ssb_drv->shutdown)
263                 ssb_drv->shutdown(ssb_dev);
264 }
265
266 static int ssb_device_remove(struct device *dev)
267 {
268         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
269         struct ssb_driver *ssb_drv = drv_to_ssb_drv(dev->driver);
270
271         if (ssb_drv && ssb_drv->remove)
272                 ssb_drv->remove(ssb_dev);
273         ssb_device_put(ssb_dev);
274
275         return 0;
276 }
277
278 static int ssb_device_probe(struct device *dev)
279 {
280         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
281         struct ssb_driver *ssb_drv = drv_to_ssb_drv(dev->driver);
282         int err = 0;
283
284         ssb_device_get(ssb_dev);
285         if (ssb_drv && ssb_drv->probe)
286                 err = ssb_drv->probe(ssb_dev, &ssb_dev->id);
287         if (err)
288                 ssb_device_put(ssb_dev);
289
290         return err;
291 }
292
293 static int ssb_match_devid(const struct ssb_device_id *tabid,
294                            const struct ssb_device_id *devid)
295 {
296         if ((tabid->vendor != devid->vendor) &&
297             tabid->vendor != SSB_ANY_VENDOR)
298                 return 0;
299         if ((tabid->coreid != devid->coreid) &&
300             tabid->coreid != SSB_ANY_ID)
301                 return 0;
302         if ((tabid->revision != devid->revision) &&
303             tabid->revision != SSB_ANY_REV)
304                 return 0;
305         return 1;
306 }
307
308 static int ssb_bus_match(struct device *dev, struct device_driver *drv)
309 {
310         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
311         struct ssb_driver *ssb_drv = drv_to_ssb_drv(drv);
312         const struct ssb_device_id *id;
313
314         for (id = ssb_drv->id_table;
315              id->vendor || id->coreid || id->revision;
316              id++) {
317                 if (ssb_match_devid(id, &ssb_dev->id))
318                         return 1; /* found */
319         }
320
321         return 0;
322 }
323
324 static int ssb_device_uevent(struct device *dev, struct kobj_uevent_env *env)
325 {
326         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
327
328         if (!dev)
329                 return -ENODEV;
330
331         return add_uevent_var(env,
332                              "MODALIAS=ssb:v%04Xid%04Xrev%02X",
333                              ssb_dev->id.vendor, ssb_dev->id.coreid,
334                              ssb_dev->id.revision);
335 }
336
337 static struct bus_type ssb_bustype = {
338         .name           = "ssb",
339         .match          = ssb_bus_match,
340         .probe          = ssb_device_probe,
341         .remove         = ssb_device_remove,
342         .shutdown       = ssb_device_shutdown,
343         .suspend        = ssb_device_suspend,
344         .resume         = ssb_device_resume,
345         .uevent         = ssb_device_uevent,
346 };
347
348 static void ssb_buses_lock(void)
349 {
350         /* See the comment at the ssb_is_early_boot definition */
351         if (!ssb_is_early_boot)
352                 mutex_lock(&buses_mutex);
353 }
354
355 static void ssb_buses_unlock(void)
356 {
357         /* See the comment at the ssb_is_early_boot definition */
358         if (!ssb_is_early_boot)
359                 mutex_unlock(&buses_mutex);
360 }
361
362 static void ssb_devices_unregister(struct ssb_bus *bus)
363 {
364         struct ssb_device *sdev;
365         int i;
366
367         for (i = bus->nr_devices - 1; i >= 0; i--) {
368                 sdev = &(bus->devices[i]);
369                 if (sdev->dev)
370                         device_unregister(sdev->dev);
371         }
372 }
373
374 void ssb_bus_unregister(struct ssb_bus *bus)
375 {
376         ssb_buses_lock();
377         ssb_devices_unregister(bus);
378         list_del(&bus->list);
379         ssb_buses_unlock();
380
381         /* ssb_pcmcia_exit(bus); */
382         ssb_pci_exit(bus);
383         ssb_iounmap(bus);
384 }
385 EXPORT_SYMBOL(ssb_bus_unregister);
386
387 static void ssb_release_dev(struct device *dev)
388 {
389         struct __ssb_dev_wrapper *devwrap;
390
391         devwrap = container_of(dev, struct __ssb_dev_wrapper, dev);
392         kfree(devwrap);
393 }
394
395 static int ssb_devices_register(struct ssb_bus *bus)
396 {
397         struct ssb_device *sdev;
398         struct device *dev;
399         struct __ssb_dev_wrapper *devwrap;
400         int i, err = 0;
401         int dev_idx = 0;
402
403         for (i = 0; i < bus->nr_devices; i++) {
404                 sdev = &(bus->devices[i]);
405
406                 /* We don't register SSB-system devices to the kernel,
407                  * as the drivers for them are built into SSB. */
408                 switch (sdev->id.coreid) {
409                 case SSB_DEV_CHIPCOMMON:
410                 case SSB_DEV_PCI:
411                 case SSB_DEV_PCIE:
412                 case SSB_DEV_PCMCIA:
413                 case SSB_DEV_MIPS:
414                 case SSB_DEV_MIPS_3302:
415                 case SSB_DEV_EXTIF:
416                         continue;
417                 }
418
419                 devwrap = kzalloc(sizeof(*devwrap), GFP_KERNEL);
420                 if (!devwrap) {
421                         ssb_printk(KERN_ERR PFX
422                                    "Could not allocate device\n");
423                         err = -ENOMEM;
424                         goto error;
425                 }
426                 dev = &devwrap->dev;
427                 devwrap->sdev = sdev;
428
429                 dev->release = ssb_release_dev;
430                 dev->bus = &ssb_bustype;
431                 snprintf(dev->bus_id, sizeof(dev->bus_id),
432                          "ssb%u:%d", bus->busnumber, dev_idx);
433
434                 switch (bus->bustype) {
435                 case SSB_BUSTYPE_PCI:
436 #ifdef CONFIG_SSB_PCIHOST
437                         sdev->irq = bus->host_pci->irq;
438                         dev->parent = &bus->host_pci->dev;
439 #endif
440                         break;
441                 case SSB_BUSTYPE_PCMCIA:
442 #ifdef CONFIG_SSB_PCMCIAHOST
443                         dev->parent = &bus->host_pcmcia->dev;
444 #endif
445                         break;
446                 case SSB_BUSTYPE_SSB:
447                         break;
448                 }
449
450                 sdev->dev = dev;
451                 err = device_register(dev);
452                 if (err) {
453                         ssb_printk(KERN_ERR PFX
454                                    "Could not register %s\n",
455                                    dev->bus_id);
456                         /* Set dev to NULL to not unregister
457                          * dev on error unwinding. */
458                         sdev->dev = NULL;
459                         kfree(devwrap);
460                         goto error;
461                 }
462                 dev_idx++;
463         }
464
465         return 0;
466 error:
467         /* Unwind the already registered devices. */
468         ssb_devices_unregister(bus);
469         return err;
470 }
471
472 /* Needs ssb_buses_lock() */
473 static int ssb_attach_queued_buses(void)
474 {
475         struct ssb_bus *bus, *n;
476         int err = 0;
477         int drop_them_all = 0;
478
479         list_for_each_entry_safe(bus, n, &attach_queue, list) {
480                 if (drop_them_all) {
481                         list_del(&bus->list);
482                         continue;
483                 }
484                 /* Can't init the PCIcore in ssb_bus_register(), as that
485                  * is too early in boot for embedded systems
486                  * (no udelay() available). So do it here in attach stage.
487                  */
488                 err = ssb_bus_powerup(bus, 0);
489                 if (err)
490                         goto error;
491                 ssb_pcicore_init(&bus->pcicore);
492                 ssb_bus_may_powerdown(bus);
493
494                 err = ssb_devices_register(bus);
495 error:
496                 if (err) {
497                         drop_them_all = 1;
498                         list_del(&bus->list);
499                         continue;
500                 }
501                 list_move_tail(&bus->list, &buses);
502         }
503
504         return err;
505 }
506
507 static u16 ssb_ssb_read16(struct ssb_device *dev, u16 offset)
508 {
509         struct ssb_bus *bus = dev->bus;
510
511         offset += dev->core_index * SSB_CORE_SIZE;
512         return readw(bus->mmio + offset);
513 }
514
515 static u32 ssb_ssb_read32(struct ssb_device *dev, u16 offset)
516 {
517         struct ssb_bus *bus = dev->bus;
518
519         offset += dev->core_index * SSB_CORE_SIZE;
520         return readl(bus->mmio + offset);
521 }
522
523 static void ssb_ssb_write16(struct ssb_device *dev, u16 offset, u16 value)
524 {
525         struct ssb_bus *bus = dev->bus;
526
527         offset += dev->core_index * SSB_CORE_SIZE;
528         writew(value, bus->mmio + offset);
529 }
530
531 static void ssb_ssb_write32(struct ssb_device *dev, u16 offset, u32 value)
532 {
533         struct ssb_bus *bus = dev->bus;
534
535         offset += dev->core_index * SSB_CORE_SIZE;
536         writel(value, bus->mmio + offset);
537 }
538
539 /* Ops for the plain SSB bus without a host-device (no PCI or PCMCIA). */
540 static const struct ssb_bus_ops ssb_ssb_ops = {
541         .read16         = ssb_ssb_read16,
542         .read32         = ssb_ssb_read32,
543         .write16        = ssb_ssb_write16,
544         .write32        = ssb_ssb_write32,
545 };
546
547 static int ssb_fetch_invariants(struct ssb_bus *bus,
548                                 ssb_invariants_func_t get_invariants)
549 {
550         struct ssb_init_invariants iv;
551         int err;
552
553         memset(&iv, 0, sizeof(iv));
554         err = get_invariants(bus, &iv);
555         if (err)
556                 goto out;
557         memcpy(&bus->boardinfo, &iv.boardinfo, sizeof(iv.boardinfo));
558         memcpy(&bus->sprom, &iv.sprom, sizeof(iv.sprom));
559 out:
560         return err;
561 }
562
563 static int ssb_bus_register(struct ssb_bus *bus,
564                             ssb_invariants_func_t get_invariants,
565                             unsigned long baseaddr)
566 {
567         int err;
568
569         spin_lock_init(&bus->bar_lock);
570         INIT_LIST_HEAD(&bus->list);
571
572         /* Powerup the bus */
573         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
574         if (err)
575                 goto out;
576         ssb_buses_lock();
577         bus->busnumber = next_busnumber;
578         /* Scan for devices (cores) */
579         err = ssb_bus_scan(bus, baseaddr);
580         if (err)
581                 goto err_disable_xtal;
582
583         /* Init PCI-host device (if any) */
584         err = ssb_pci_init(bus);
585         if (err)
586                 goto err_unmap;
587         /* Init PCMCIA-host device (if any) */
588         err = ssb_pcmcia_init(bus);
589         if (err)
590                 goto err_pci_exit;
591
592         /* Initialize basic system devices (if available) */
593         err = ssb_bus_powerup(bus, 0);
594         if (err)
595                 goto err_pcmcia_exit;
596         ssb_chipcommon_init(&bus->chipco);
597         ssb_mipscore_init(&bus->mipscore);
598         err = ssb_fetch_invariants(bus, get_invariants);
599         if (err) {
600                 ssb_bus_may_powerdown(bus);
601                 goto err_pcmcia_exit;
602         }
603         ssb_bus_may_powerdown(bus);
604
605         /* Queue it for attach.
606          * See the comment at the ssb_is_early_boot definition. */
607         list_add_tail(&bus->list, &attach_queue);
608         if (!ssb_is_early_boot) {
609                 /* This is not early boot, so we must attach the bus now */
610                 err = ssb_attach_queued_buses();
611                 if (err)
612                         goto err_dequeue;
613         }
614         next_busnumber++;
615         ssb_buses_unlock();
616
617 out:
618         return err;
619
620 err_dequeue:
621         list_del(&bus->list);
622 err_pcmcia_exit:
623 /*      ssb_pcmcia_exit(bus); */
624 err_pci_exit:
625         ssb_pci_exit(bus);
626 err_unmap:
627         ssb_iounmap(bus);
628 err_disable_xtal:
629         ssb_buses_unlock();
630         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
631         return err;
632 }
633
634 #ifdef CONFIG_SSB_PCIHOST
635 int ssb_bus_pcibus_register(struct ssb_bus *bus,
636                             struct pci_dev *host_pci)
637 {
638         int err;
639
640         bus->bustype = SSB_BUSTYPE_PCI;
641         bus->host_pci = host_pci;
642         bus->ops = &ssb_pci_ops;
643
644         err = ssb_bus_register(bus, ssb_pci_get_invariants, 0);
645         if (!err) {
646                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
647                            "PCI device %s\n", host_pci->dev.bus_id);
648         }
649
650         return err;
651 }
652 EXPORT_SYMBOL(ssb_bus_pcibus_register);
653 #endif /* CONFIG_SSB_PCIHOST */
654
655 #ifdef CONFIG_SSB_PCMCIAHOST
656 int ssb_bus_pcmciabus_register(struct ssb_bus *bus,
657                                struct pcmcia_device *pcmcia_dev,
658                                unsigned long baseaddr)
659 {
660         int err;
661
662         bus->bustype = SSB_BUSTYPE_PCMCIA;
663         bus->host_pcmcia = pcmcia_dev;
664         bus->ops = &ssb_pcmcia_ops;
665
666         err = ssb_bus_register(bus, ssb_pcmcia_get_invariants, baseaddr);
667         if (!err) {
668                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
669                            "PCMCIA device %s\n", pcmcia_dev->devname);
670         }
671
672         return err;
673 }
674 EXPORT_SYMBOL(ssb_bus_pcmciabus_register);
675 #endif /* CONFIG_SSB_PCMCIAHOST */
676
677 int ssb_bus_ssbbus_register(struct ssb_bus *bus,
678                             unsigned long baseaddr,
679                             ssb_invariants_func_t get_invariants)
680 {
681         int err;
682
683         bus->bustype = SSB_BUSTYPE_SSB;
684         bus->ops = &ssb_ssb_ops;
685
686         err = ssb_bus_register(bus, get_invariants, baseaddr);
687         if (!err) {
688                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found at "
689                            "address 0x%08lX\n", baseaddr);
690         }
691
692         return err;
693 }
694
695 int __ssb_driver_register(struct ssb_driver *drv, struct module *owner)
696 {
697         drv->drv.name = drv->name;
698         drv->drv.bus = &ssb_bustype;
699         drv->drv.owner = owner;
700
701         return driver_register(&drv->drv);
702 }
703 EXPORT_SYMBOL(__ssb_driver_register);
704
705 void ssb_driver_unregister(struct ssb_driver *drv)
706 {
707         driver_unregister(&drv->drv);
708 }
709 EXPORT_SYMBOL(ssb_driver_unregister);
710
711 void ssb_set_devtypedata(struct ssb_device *dev, void *data)
712 {
713         struct ssb_bus *bus = dev->bus;
714         struct ssb_device *ent;
715         int i;
716
717         for (i = 0; i < bus->nr_devices; i++) {
718                 ent = &(bus->devices[i]);
719                 if (ent->id.vendor != dev->id.vendor)
720                         continue;
721                 if (ent->id.coreid != dev->id.coreid)
722                         continue;
723
724                 ent->devtypedata = data;
725         }
726 }
727 EXPORT_SYMBOL(ssb_set_devtypedata);
728
729 static u32 clkfactor_f6_resolve(u32 v)
730 {
731         /* map the magic values */
732         switch (v) {
733         case SSB_CHIPCO_CLK_F6_2:
734                 return 2;
735         case SSB_CHIPCO_CLK_F6_3:
736                 return 3;
737         case SSB_CHIPCO_CLK_F6_4:
738                 return 4;
739         case SSB_CHIPCO_CLK_F6_5:
740                 return 5;
741         case SSB_CHIPCO_CLK_F6_6:
742                 return 6;
743         case SSB_CHIPCO_CLK_F6_7:
744                 return 7;
745         }
746         return 0;
747 }
748
749 /* Calculate the speed the backplane would run at a given set of clockcontrol values */
750 u32 ssb_calc_clock_rate(u32 plltype, u32 n, u32 m)
751 {
752         u32 n1, n2, clock, m1, m2, m3, mc;
753
754         n1 = (n & SSB_CHIPCO_CLK_N1);
755         n2 = ((n & SSB_CHIPCO_CLK_N2) >> SSB_CHIPCO_CLK_N2_SHIFT);
756
757         switch (plltype) {
758         case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
759                 if (m & SSB_CHIPCO_CLK_T6_MMASK)
760                         return SSB_CHIPCO_CLK_T6_M0;
761                 return SSB_CHIPCO_CLK_T6_M1;
762         case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
763         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
764         case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
765         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
766                 n1 = clkfactor_f6_resolve(n1);
767                 n2 += SSB_CHIPCO_CLK_F5_BIAS;
768                 break;
769         case SSB_PLLTYPE_2: /* 48Mhz, 4 dividers */
770                 n1 += SSB_CHIPCO_CLK_T2_BIAS;
771                 n2 += SSB_CHIPCO_CLK_T2_BIAS;
772                 SSB_WARN_ON(!((n1 >= 2) && (n1 <= 7)));
773                 SSB_WARN_ON(!((n2 >= 5) && (n2 <= 23)));
774                 break;
775         case SSB_PLLTYPE_5: /* 25Mhz, 4 dividers */
776                 return 100000000;
777         default:
778                 SSB_WARN_ON(1);
779         }
780
781         switch (plltype) {
782         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
783         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
784                 clock = SSB_CHIPCO_CLK_BASE2 * n1 * n2;
785                 break;
786         default:
787                 clock = SSB_CHIPCO_CLK_BASE1 * n1 * n2;
788         }
789         if (!clock)
790                 return 0;
791
792         m1 = (m & SSB_CHIPCO_CLK_M1);
793         m2 = ((m & SSB_CHIPCO_CLK_M2) >> SSB_CHIPCO_CLK_M2_SHIFT);
794         m3 = ((m & SSB_CHIPCO_CLK_M3) >> SSB_CHIPCO_CLK_M3_SHIFT);
795         mc = ((m & SSB_CHIPCO_CLK_MC) >> SSB_CHIPCO_CLK_MC_SHIFT);
796
797         switch (plltype) {
798         case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
799         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
800         case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
801         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
802                 m1 = clkfactor_f6_resolve(m1);
803                 if ((plltype == SSB_PLLTYPE_1) ||
804                     (plltype == SSB_PLLTYPE_3))
805                         m2 += SSB_CHIPCO_CLK_F5_BIAS;
806                 else
807                         m2 = clkfactor_f6_resolve(m2);
808                 m3 = clkfactor_f6_resolve(m3);
809
810                 switch (mc) {
811                 case SSB_CHIPCO_CLK_MC_BYPASS:
812                         return clock;
813                 case SSB_CHIPCO_CLK_MC_M1:
814                         return (clock / m1);
815                 case SSB_CHIPCO_CLK_MC_M1M2:
816                         return (clock / (m1 * m2));
817                 case SSB_CHIPCO_CLK_MC_M1M2M3:
818                         return (clock / (m1 * m2 * m3));
819                 case SSB_CHIPCO_CLK_MC_M1M3:
820                         return (clock / (m1 * m3));
821                 }
822                 return 0;
823         case SSB_PLLTYPE_2:
824                 m1 += SSB_CHIPCO_CLK_T2_BIAS;
825                 m2 += SSB_CHIPCO_CLK_T2M2_BIAS;
826                 m3 += SSB_CHIPCO_CLK_T2_BIAS;
827                 SSB_WARN_ON(!((m1 >= 2) && (m1 <= 7)));
828                 SSB_WARN_ON(!((m2 >= 3) && (m2 <= 10)));
829                 SSB_WARN_ON(!((m3 >= 2) && (m3 <= 7)));
830
831                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M1BYP))
832                         clock /= m1;
833                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M2BYP))
834                         clock /= m2;
835                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M3BYP))
836                         clock /= m3;
837                 return clock;
838         default:
839                 SSB_WARN_ON(1);
840         }
841         return 0;
842 }
843
844 /* Get the current speed the backplane is running at */
845 u32 ssb_clockspeed(struct ssb_bus *bus)
846 {
847         u32 rate;
848         u32 plltype;
849         u32 clkctl_n, clkctl_m;
850
851         if (ssb_extif_available(&bus->extif))
852                 ssb_extif_get_clockcontrol(&bus->extif, &plltype,
853                                            &clkctl_n, &clkctl_m);
854         else if (bus->chipco.dev)
855                 ssb_chipco_get_clockcontrol(&bus->chipco, &plltype,
856                                             &clkctl_n, &clkctl_m);
857         else
858                 return 0;
859
860         if (bus->chip_id == 0x5365) {
861                 rate = 100000000;
862         } else {
863                 rate = ssb_calc_clock_rate(plltype, clkctl_n, clkctl_m);
864                 if (plltype == SSB_PLLTYPE_3) /* 25Mhz, 2 dividers */
865                         rate /= 2;
866         }
867
868         return rate;
869 }
870 EXPORT_SYMBOL(ssb_clockspeed);
871
872 static u32 ssb_tmslow_reject_bitmask(struct ssb_device *dev)
873 {
874         /* The REJECT bit changed position in TMSLOW between
875          * Backplane revisions. */
876         switch (ssb_read32(dev, SSB_IDLOW) & SSB_IDLOW_SSBREV) {
877         case SSB_IDLOW_SSBREV_22:
878                 return SSB_TMSLOW_REJECT_22;
879         case SSB_IDLOW_SSBREV_23:
880                 return SSB_TMSLOW_REJECT_23;
881         default:
882                 WARN_ON(1);
883         }
884         return (SSB_TMSLOW_REJECT_22 | SSB_TMSLOW_REJECT_23);
885 }
886
887 int ssb_device_is_enabled(struct ssb_device *dev)
888 {
889         u32 val;
890         u32 reject;
891
892         reject = ssb_tmslow_reject_bitmask(dev);
893         val = ssb_read32(dev, SSB_TMSLOW);
894         val &= SSB_TMSLOW_CLOCK | SSB_TMSLOW_RESET | reject;
895
896         return (val == SSB_TMSLOW_CLOCK);
897 }
898 EXPORT_SYMBOL(ssb_device_is_enabled);
899
900 static void ssb_flush_tmslow(struct ssb_device *dev)
901 {
902         /* Make _really_ sure the device has finished the TMSLOW
903          * register write transaction, as we risk running into
904          * a machine check exception otherwise.
905          * Do this by reading the register back to commit the
906          * PCI write and delay an additional usec for the device
907          * to react to the change. */
908         ssb_read32(dev, SSB_TMSLOW);
909         udelay(1);
910 }
911
912 void ssb_device_enable(struct ssb_device *dev, u32 core_specific_flags)
913 {
914         u32 val;
915
916         ssb_device_disable(dev, core_specific_flags);
917         ssb_write32(dev, SSB_TMSLOW,
918                     SSB_TMSLOW_RESET | SSB_TMSLOW_CLOCK |
919                     SSB_TMSLOW_FGC | core_specific_flags);
920         ssb_flush_tmslow(dev);
921
922         /* Clear SERR if set. This is a hw bug workaround. */
923         if (ssb_read32(dev, SSB_TMSHIGH) & SSB_TMSHIGH_SERR)
924                 ssb_write32(dev, SSB_TMSHIGH, 0);
925
926         val = ssb_read32(dev, SSB_IMSTATE);
927         if (val & (SSB_IMSTATE_IBE | SSB_IMSTATE_TO)) {
928                 val &= ~(SSB_IMSTATE_IBE | SSB_IMSTATE_TO);
929                 ssb_write32(dev, SSB_IMSTATE, val);
930         }
931
932         ssb_write32(dev, SSB_TMSLOW,
933                     SSB_TMSLOW_CLOCK | SSB_TMSLOW_FGC |
934                     core_specific_flags);
935         ssb_flush_tmslow(dev);
936
937         ssb_write32(dev, SSB_TMSLOW, SSB_TMSLOW_CLOCK |
938                     core_specific_flags);
939         ssb_flush_tmslow(dev);
940 }
941 EXPORT_SYMBOL(ssb_device_enable);
942
943 /* Wait for a bit in a register to get set or unset.
944  * timeout is in units of ten-microseconds */
945 static int ssb_wait_bit(struct ssb_device *dev, u16 reg, u32 bitmask,
946                         int timeout, int set)
947 {
948         int i;
949         u32 val;
950
951         for (i = 0; i < timeout; i++) {
952                 val = ssb_read32(dev, reg);
953                 if (set) {
954                         if (val & bitmask)
955                                 return 0;
956                 } else {
957                         if (!(val & bitmask))
958                                 return 0;
959                 }
960                 udelay(10);
961         }
962         printk(KERN_ERR PFX "Timeout waiting for bitmask %08X on "
963                             "register %04X to %s.\n",
964                bitmask, reg, (set ? "set" : "clear"));
965
966         return -ETIMEDOUT;
967 }
968
969 void ssb_device_disable(struct ssb_device *dev, u32 core_specific_flags)
970 {
971         u32 reject;
972
973         if (ssb_read32(dev, SSB_TMSLOW) & SSB_TMSLOW_RESET)
974                 return;
975
976         reject = ssb_tmslow_reject_bitmask(dev);
977         ssb_write32(dev, SSB_TMSLOW, reject | SSB_TMSLOW_CLOCK);
978         ssb_wait_bit(dev, SSB_TMSLOW, reject, 1000, 1);
979         ssb_wait_bit(dev, SSB_TMSHIGH, SSB_TMSHIGH_BUSY, 1000, 0);
980         ssb_write32(dev, SSB_TMSLOW,
981                     SSB_TMSLOW_FGC | SSB_TMSLOW_CLOCK |
982                     reject | SSB_TMSLOW_RESET |
983                     core_specific_flags);
984         ssb_flush_tmslow(dev);
985
986         ssb_write32(dev, SSB_TMSLOW,
987                     reject | SSB_TMSLOW_RESET |
988                     core_specific_flags);
989         ssb_flush_tmslow(dev);
990 }
991 EXPORT_SYMBOL(ssb_device_disable);
992
993 u32 ssb_dma_translation(struct ssb_device *dev)
994 {
995         switch (dev->bus->bustype) {
996         case SSB_BUSTYPE_SSB:
997                 return 0;
998         case SSB_BUSTYPE_PCI:
999         case SSB_BUSTYPE_PCMCIA:
1000                 return SSB_PCI_DMA;
1001         }
1002         return 0;
1003 }
1004 EXPORT_SYMBOL(ssb_dma_translation);
1005
1006 int ssb_dma_set_mask(struct ssb_device *ssb_dev, u64 mask)
1007 {
1008         struct device *dev = ssb_dev->dev;
1009
1010 #ifdef CONFIG_SSB_PCIHOST
1011         if (ssb_dev->bus->bustype == SSB_BUSTYPE_PCI &&
1012             !dma_supported(dev, mask))
1013                 return -EIO;
1014 #endif
1015         dev->coherent_dma_mask = mask;
1016         dev->dma_mask = &dev->coherent_dma_mask;
1017
1018         return 0;
1019 }
1020 EXPORT_SYMBOL(ssb_dma_set_mask);
1021
1022 int ssb_bus_may_powerdown(struct ssb_bus *bus)
1023 {
1024         struct ssb_chipcommon *cc;
1025         int err = 0;
1026
1027         /* On buses where more than one core may be working
1028          * at a time, we must not powerdown stuff if there are
1029          * still cores that may want to run. */
1030         if (bus->bustype == SSB_BUSTYPE_SSB)
1031                 goto out;
1032
1033         cc = &bus->chipco;
1034         ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
1035         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
1036         if (err)
1037                 goto error;
1038 out:
1039 #ifdef CONFIG_SSB_DEBUG
1040         bus->powered_up = 0;
1041 #endif
1042         return err;
1043 error:
1044         ssb_printk(KERN_ERR PFX "Bus powerdown failed\n");
1045         goto out;
1046 }
1047 EXPORT_SYMBOL(ssb_bus_may_powerdown);
1048
1049 int ssb_bus_powerup(struct ssb_bus *bus, bool dynamic_pctl)
1050 {
1051         struct ssb_chipcommon *cc;
1052         int err;
1053         enum ssb_clkmode mode;
1054
1055         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
1056         if (err)
1057                 goto error;
1058         cc = &bus->chipco;
1059         mode = dynamic_pctl ? SSB_CLKMODE_DYNAMIC : SSB_CLKMODE_FAST;
1060         ssb_chipco_set_clockmode(cc, mode);
1061
1062 #ifdef CONFIG_SSB_DEBUG
1063         bus->powered_up = 1;
1064 #endif
1065         return 0;
1066 error:
1067         ssb_printk(KERN_ERR PFX "Bus powerup failed\n");
1068         return err;
1069 }
1070 EXPORT_SYMBOL(ssb_bus_powerup);
1071
1072 u32 ssb_admatch_base(u32 adm)
1073 {
1074         u32 base = 0;
1075
1076         switch (adm & SSB_ADM_TYPE) {
1077         case SSB_ADM_TYPE0:
1078                 base = (adm & SSB_ADM_BASE0);
1079                 break;
1080         case SSB_ADM_TYPE1:
1081                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1082                 base = (adm & SSB_ADM_BASE1);
1083                 break;
1084         case SSB_ADM_TYPE2:
1085                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1086                 base = (adm & SSB_ADM_BASE2);
1087                 break;
1088         default:
1089                 SSB_WARN_ON(1);
1090         }
1091
1092         return base;
1093 }
1094 EXPORT_SYMBOL(ssb_admatch_base);
1095
1096 u32 ssb_admatch_size(u32 adm)
1097 {
1098         u32 size = 0;
1099
1100         switch (adm & SSB_ADM_TYPE) {
1101         case SSB_ADM_TYPE0:
1102                 size = ((adm & SSB_ADM_SZ0) >> SSB_ADM_SZ0_SHIFT);
1103                 break;
1104         case SSB_ADM_TYPE1:
1105                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1106                 size = ((adm & SSB_ADM_SZ1) >> SSB_ADM_SZ1_SHIFT);
1107                 break;
1108         case SSB_ADM_TYPE2:
1109                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1110                 size = ((adm & SSB_ADM_SZ2) >> SSB_ADM_SZ2_SHIFT);
1111                 break;
1112         default:
1113                 SSB_WARN_ON(1);
1114         }
1115         size = (1 << (size + 1));
1116
1117         return size;
1118 }
1119 EXPORT_SYMBOL(ssb_admatch_size);
1120
1121 static int __init ssb_modinit(void)
1122 {
1123         int err;
1124
1125         /* See the comment at the ssb_is_early_boot definition */
1126         ssb_is_early_boot = 0;
1127         err = bus_register(&ssb_bustype);
1128         if (err)
1129                 return err;
1130
1131         /* Maybe we already registered some buses at early boot.
1132          * Check for this and attach them
1133          */
1134         ssb_buses_lock();
1135         err = ssb_attach_queued_buses();
1136         ssb_buses_unlock();
1137         if (err)
1138                 bus_unregister(&ssb_bustype);
1139
1140         err = b43_pci_ssb_bridge_init();
1141         if (err) {
1142                 ssb_printk(KERN_ERR "Broadcom 43xx PCI-SSB-bridge "
1143                            "initialization failed");
1144                 /* don't fail SSB init because of this */
1145                 err = 0;
1146         }
1147
1148         return err;
1149 }
1150 subsys_initcall(ssb_modinit);
1151
1152 static void __exit ssb_modexit(void)
1153 {
1154         b43_pci_ssb_bridge_exit();
1155         bus_unregister(&ssb_bustype);
1156 }
1157 module_exit(ssb_modexit)