ssb: Fix pcicore cardbus mode
[linux-2.6.git] / 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                         sdev->irq = bus->host_pcmcia->irq.AssignedIRQ;
444                         dev->parent = &bus->host_pcmcia->dev;
445 #endif
446                         break;
447                 case SSB_BUSTYPE_SSB:
448                         break;
449                 }
450
451                 sdev->dev = dev;
452                 err = device_register(dev);
453                 if (err) {
454                         ssb_printk(KERN_ERR PFX
455                                    "Could not register %s\n",
456                                    dev->bus_id);
457                         /* Set dev to NULL to not unregister
458                          * dev on error unwinding. */
459                         sdev->dev = NULL;
460                         kfree(devwrap);
461                         goto error;
462                 }
463                 dev_idx++;
464         }
465
466         return 0;
467 error:
468         /* Unwind the already registered devices. */
469         ssb_devices_unregister(bus);
470         return err;
471 }
472
473 /* Needs ssb_buses_lock() */
474 static int ssb_attach_queued_buses(void)
475 {
476         struct ssb_bus *bus, *n;
477         int err = 0;
478         int drop_them_all = 0;
479
480         list_for_each_entry_safe(bus, n, &attach_queue, list) {
481                 if (drop_them_all) {
482                         list_del(&bus->list);
483                         continue;
484                 }
485                 /* Can't init the PCIcore in ssb_bus_register(), as that
486                  * is too early in boot for embedded systems
487                  * (no udelay() available). So do it here in attach stage.
488                  */
489                 err = ssb_bus_powerup(bus, 0);
490                 if (err)
491                         goto error;
492                 ssb_pcicore_init(&bus->pcicore);
493                 ssb_bus_may_powerdown(bus);
494
495                 err = ssb_devices_register(bus);
496 error:
497                 if (err) {
498                         drop_them_all = 1;
499                         list_del(&bus->list);
500                         continue;
501                 }
502                 list_move_tail(&bus->list, &buses);
503         }
504
505         return err;
506 }
507
508 static u16 ssb_ssb_read16(struct ssb_device *dev, u16 offset)
509 {
510         struct ssb_bus *bus = dev->bus;
511
512         offset += dev->core_index * SSB_CORE_SIZE;
513         return readw(bus->mmio + offset);
514 }
515
516 static u32 ssb_ssb_read32(struct ssb_device *dev, u16 offset)
517 {
518         struct ssb_bus *bus = dev->bus;
519
520         offset += dev->core_index * SSB_CORE_SIZE;
521         return readl(bus->mmio + offset);
522 }
523
524 static void ssb_ssb_write16(struct ssb_device *dev, u16 offset, u16 value)
525 {
526         struct ssb_bus *bus = dev->bus;
527
528         offset += dev->core_index * SSB_CORE_SIZE;
529         writew(value, bus->mmio + offset);
530 }
531
532 static void ssb_ssb_write32(struct ssb_device *dev, u16 offset, u32 value)
533 {
534         struct ssb_bus *bus = dev->bus;
535
536         offset += dev->core_index * SSB_CORE_SIZE;
537         writel(value, bus->mmio + offset);
538 }
539
540 /* Ops for the plain SSB bus without a host-device (no PCI or PCMCIA). */
541 static const struct ssb_bus_ops ssb_ssb_ops = {
542         .read16         = ssb_ssb_read16,
543         .read32         = ssb_ssb_read32,
544         .write16        = ssb_ssb_write16,
545         .write32        = ssb_ssb_write32,
546 };
547
548 static int ssb_fetch_invariants(struct ssb_bus *bus,
549                                 ssb_invariants_func_t get_invariants)
550 {
551         struct ssb_init_invariants iv;
552         int err;
553
554         memset(&iv, 0, sizeof(iv));
555         err = get_invariants(bus, &iv);
556         if (err)
557                 goto out;
558         memcpy(&bus->boardinfo, &iv.boardinfo, sizeof(iv.boardinfo));
559         memcpy(&bus->sprom, &iv.sprom, sizeof(iv.sprom));
560         bus->has_cardbus_slot = iv.has_cardbus_slot;
561 out:
562         return err;
563 }
564
565 static int ssb_bus_register(struct ssb_bus *bus,
566                             ssb_invariants_func_t get_invariants,
567                             unsigned long baseaddr)
568 {
569         int err;
570
571         spin_lock_init(&bus->bar_lock);
572         INIT_LIST_HEAD(&bus->list);
573 #ifdef CONFIG_SSB_EMBEDDED
574         spin_lock_init(&bus->gpio_lock);
575 #endif
576
577         /* Powerup the bus */
578         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
579         if (err)
580                 goto out;
581         ssb_buses_lock();
582         bus->busnumber = next_busnumber;
583         /* Scan for devices (cores) */
584         err = ssb_bus_scan(bus, baseaddr);
585         if (err)
586                 goto err_disable_xtal;
587
588         /* Init PCI-host device (if any) */
589         err = ssb_pci_init(bus);
590         if (err)
591                 goto err_unmap;
592         /* Init PCMCIA-host device (if any) */
593         err = ssb_pcmcia_init(bus);
594         if (err)
595                 goto err_pci_exit;
596
597         /* Initialize basic system devices (if available) */
598         err = ssb_bus_powerup(bus, 0);
599         if (err)
600                 goto err_pcmcia_exit;
601         ssb_chipcommon_init(&bus->chipco);
602         ssb_mipscore_init(&bus->mipscore);
603         err = ssb_fetch_invariants(bus, get_invariants);
604         if (err) {
605                 ssb_bus_may_powerdown(bus);
606                 goto err_pcmcia_exit;
607         }
608         ssb_bus_may_powerdown(bus);
609
610         /* Queue it for attach.
611          * See the comment at the ssb_is_early_boot definition. */
612         list_add_tail(&bus->list, &attach_queue);
613         if (!ssb_is_early_boot) {
614                 /* This is not early boot, so we must attach the bus now */
615                 err = ssb_attach_queued_buses();
616                 if (err)
617                         goto err_dequeue;
618         }
619         next_busnumber++;
620         ssb_buses_unlock();
621
622 out:
623         return err;
624
625 err_dequeue:
626         list_del(&bus->list);
627 err_pcmcia_exit:
628 /*      ssb_pcmcia_exit(bus); */
629 err_pci_exit:
630         ssb_pci_exit(bus);
631 err_unmap:
632         ssb_iounmap(bus);
633 err_disable_xtal:
634         ssb_buses_unlock();
635         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
636         return err;
637 }
638
639 #ifdef CONFIG_SSB_PCIHOST
640 int ssb_bus_pcibus_register(struct ssb_bus *bus,
641                             struct pci_dev *host_pci)
642 {
643         int err;
644
645         bus->bustype = SSB_BUSTYPE_PCI;
646         bus->host_pci = host_pci;
647         bus->ops = &ssb_pci_ops;
648
649         err = ssb_bus_register(bus, ssb_pci_get_invariants, 0);
650         if (!err) {
651                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
652                            "PCI device %s\n", host_pci->dev.bus_id);
653         }
654
655         return err;
656 }
657 EXPORT_SYMBOL(ssb_bus_pcibus_register);
658 #endif /* CONFIG_SSB_PCIHOST */
659
660 #ifdef CONFIG_SSB_PCMCIAHOST
661 int ssb_bus_pcmciabus_register(struct ssb_bus *bus,
662                                struct pcmcia_device *pcmcia_dev,
663                                unsigned long baseaddr)
664 {
665         int err;
666
667         bus->bustype = SSB_BUSTYPE_PCMCIA;
668         bus->host_pcmcia = pcmcia_dev;
669         bus->ops = &ssb_pcmcia_ops;
670
671         err = ssb_bus_register(bus, ssb_pcmcia_get_invariants, baseaddr);
672         if (!err) {
673                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
674                            "PCMCIA device %s\n", pcmcia_dev->devname);
675         }
676
677         return err;
678 }
679 EXPORT_SYMBOL(ssb_bus_pcmciabus_register);
680 #endif /* CONFIG_SSB_PCMCIAHOST */
681
682 int ssb_bus_ssbbus_register(struct ssb_bus *bus,
683                             unsigned long baseaddr,
684                             ssb_invariants_func_t get_invariants)
685 {
686         int err;
687
688         bus->bustype = SSB_BUSTYPE_SSB;
689         bus->ops = &ssb_ssb_ops;
690
691         err = ssb_bus_register(bus, get_invariants, baseaddr);
692         if (!err) {
693                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found at "
694                            "address 0x%08lX\n", baseaddr);
695         }
696
697         return err;
698 }
699
700 int __ssb_driver_register(struct ssb_driver *drv, struct module *owner)
701 {
702         drv->drv.name = drv->name;
703         drv->drv.bus = &ssb_bustype;
704         drv->drv.owner = owner;
705
706         return driver_register(&drv->drv);
707 }
708 EXPORT_SYMBOL(__ssb_driver_register);
709
710 void ssb_driver_unregister(struct ssb_driver *drv)
711 {
712         driver_unregister(&drv->drv);
713 }
714 EXPORT_SYMBOL(ssb_driver_unregister);
715
716 void ssb_set_devtypedata(struct ssb_device *dev, void *data)
717 {
718         struct ssb_bus *bus = dev->bus;
719         struct ssb_device *ent;
720         int i;
721
722         for (i = 0; i < bus->nr_devices; i++) {
723                 ent = &(bus->devices[i]);
724                 if (ent->id.vendor != dev->id.vendor)
725                         continue;
726                 if (ent->id.coreid != dev->id.coreid)
727                         continue;
728
729                 ent->devtypedata = data;
730         }
731 }
732 EXPORT_SYMBOL(ssb_set_devtypedata);
733
734 static u32 clkfactor_f6_resolve(u32 v)
735 {
736         /* map the magic values */
737         switch (v) {
738         case SSB_CHIPCO_CLK_F6_2:
739                 return 2;
740         case SSB_CHIPCO_CLK_F6_3:
741                 return 3;
742         case SSB_CHIPCO_CLK_F6_4:
743                 return 4;
744         case SSB_CHIPCO_CLK_F6_5:
745                 return 5;
746         case SSB_CHIPCO_CLK_F6_6:
747                 return 6;
748         case SSB_CHIPCO_CLK_F6_7:
749                 return 7;
750         }
751         return 0;
752 }
753
754 /* Calculate the speed the backplane would run at a given set of clockcontrol values */
755 u32 ssb_calc_clock_rate(u32 plltype, u32 n, u32 m)
756 {
757         u32 n1, n2, clock, m1, m2, m3, mc;
758
759         n1 = (n & SSB_CHIPCO_CLK_N1);
760         n2 = ((n & SSB_CHIPCO_CLK_N2) >> SSB_CHIPCO_CLK_N2_SHIFT);
761
762         switch (plltype) {
763         case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
764                 if (m & SSB_CHIPCO_CLK_T6_MMASK)
765                         return SSB_CHIPCO_CLK_T6_M0;
766                 return SSB_CHIPCO_CLK_T6_M1;
767         case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
768         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
769         case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
770         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
771                 n1 = clkfactor_f6_resolve(n1);
772                 n2 += SSB_CHIPCO_CLK_F5_BIAS;
773                 break;
774         case SSB_PLLTYPE_2: /* 48Mhz, 4 dividers */
775                 n1 += SSB_CHIPCO_CLK_T2_BIAS;
776                 n2 += SSB_CHIPCO_CLK_T2_BIAS;
777                 SSB_WARN_ON(!((n1 >= 2) && (n1 <= 7)));
778                 SSB_WARN_ON(!((n2 >= 5) && (n2 <= 23)));
779                 break;
780         case SSB_PLLTYPE_5: /* 25Mhz, 4 dividers */
781                 return 100000000;
782         default:
783                 SSB_WARN_ON(1);
784         }
785
786         switch (plltype) {
787         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
788         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
789                 clock = SSB_CHIPCO_CLK_BASE2 * n1 * n2;
790                 break;
791         default:
792                 clock = SSB_CHIPCO_CLK_BASE1 * n1 * n2;
793         }
794         if (!clock)
795                 return 0;
796
797         m1 = (m & SSB_CHIPCO_CLK_M1);
798         m2 = ((m & SSB_CHIPCO_CLK_M2) >> SSB_CHIPCO_CLK_M2_SHIFT);
799         m3 = ((m & SSB_CHIPCO_CLK_M3) >> SSB_CHIPCO_CLK_M3_SHIFT);
800         mc = ((m & SSB_CHIPCO_CLK_MC) >> SSB_CHIPCO_CLK_MC_SHIFT);
801
802         switch (plltype) {
803         case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
804         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
805         case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
806         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
807                 m1 = clkfactor_f6_resolve(m1);
808                 if ((plltype == SSB_PLLTYPE_1) ||
809                     (plltype == SSB_PLLTYPE_3))
810                         m2 += SSB_CHIPCO_CLK_F5_BIAS;
811                 else
812                         m2 = clkfactor_f6_resolve(m2);
813                 m3 = clkfactor_f6_resolve(m3);
814
815                 switch (mc) {
816                 case SSB_CHIPCO_CLK_MC_BYPASS:
817                         return clock;
818                 case SSB_CHIPCO_CLK_MC_M1:
819                         return (clock / m1);
820                 case SSB_CHIPCO_CLK_MC_M1M2:
821                         return (clock / (m1 * m2));
822                 case SSB_CHIPCO_CLK_MC_M1M2M3:
823                         return (clock / (m1 * m2 * m3));
824                 case SSB_CHIPCO_CLK_MC_M1M3:
825                         return (clock / (m1 * m3));
826                 }
827                 return 0;
828         case SSB_PLLTYPE_2:
829                 m1 += SSB_CHIPCO_CLK_T2_BIAS;
830                 m2 += SSB_CHIPCO_CLK_T2M2_BIAS;
831                 m3 += SSB_CHIPCO_CLK_T2_BIAS;
832                 SSB_WARN_ON(!((m1 >= 2) && (m1 <= 7)));
833                 SSB_WARN_ON(!((m2 >= 3) && (m2 <= 10)));
834                 SSB_WARN_ON(!((m3 >= 2) && (m3 <= 7)));
835
836                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M1BYP))
837                         clock /= m1;
838                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M2BYP))
839                         clock /= m2;
840                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M3BYP))
841                         clock /= m3;
842                 return clock;
843         default:
844                 SSB_WARN_ON(1);
845         }
846         return 0;
847 }
848
849 /* Get the current speed the backplane is running at */
850 u32 ssb_clockspeed(struct ssb_bus *bus)
851 {
852         u32 rate;
853         u32 plltype;
854         u32 clkctl_n, clkctl_m;
855
856         if (ssb_extif_available(&bus->extif))
857                 ssb_extif_get_clockcontrol(&bus->extif, &plltype,
858                                            &clkctl_n, &clkctl_m);
859         else if (bus->chipco.dev)
860                 ssb_chipco_get_clockcontrol(&bus->chipco, &plltype,
861                                             &clkctl_n, &clkctl_m);
862         else
863                 return 0;
864
865         if (bus->chip_id == 0x5365) {
866                 rate = 100000000;
867         } else {
868                 rate = ssb_calc_clock_rate(plltype, clkctl_n, clkctl_m);
869                 if (plltype == SSB_PLLTYPE_3) /* 25Mhz, 2 dividers */
870                         rate /= 2;
871         }
872
873         return rate;
874 }
875 EXPORT_SYMBOL(ssb_clockspeed);
876
877 static u32 ssb_tmslow_reject_bitmask(struct ssb_device *dev)
878 {
879         u32 rev = ssb_read32(dev, SSB_IDLOW) & SSB_IDLOW_SSBREV;
880
881         /* The REJECT bit changed position in TMSLOW between
882          * Backplane revisions. */
883         switch (rev) {
884         case SSB_IDLOW_SSBREV_22:
885                 return SSB_TMSLOW_REJECT_22;
886         case SSB_IDLOW_SSBREV_23:
887                 return SSB_TMSLOW_REJECT_23;
888         case SSB_IDLOW_SSBREV_24:     /* TODO - find the proper REJECT bits */
889         case SSB_IDLOW_SSBREV_25:     /* same here */
890         case SSB_IDLOW_SSBREV_26:     /* same here */
891         case SSB_IDLOW_SSBREV_27:     /* same here */
892                 return SSB_TMSLOW_REJECT_23;    /* this is a guess */
893         default:
894                 printk(KERN_INFO "ssb: Backplane Revision 0x%.8X\n", rev);
895                 WARN_ON(1);
896         }
897         return (SSB_TMSLOW_REJECT_22 | SSB_TMSLOW_REJECT_23);
898 }
899
900 int ssb_device_is_enabled(struct ssb_device *dev)
901 {
902         u32 val;
903         u32 reject;
904
905         reject = ssb_tmslow_reject_bitmask(dev);
906         val = ssb_read32(dev, SSB_TMSLOW);
907         val &= SSB_TMSLOW_CLOCK | SSB_TMSLOW_RESET | reject;
908
909         return (val == SSB_TMSLOW_CLOCK);
910 }
911 EXPORT_SYMBOL(ssb_device_is_enabled);
912
913 static void ssb_flush_tmslow(struct ssb_device *dev)
914 {
915         /* Make _really_ sure the device has finished the TMSLOW
916          * register write transaction, as we risk running into
917          * a machine check exception otherwise.
918          * Do this by reading the register back to commit the
919          * PCI write and delay an additional usec for the device
920          * to react to the change. */
921         ssb_read32(dev, SSB_TMSLOW);
922         udelay(1);
923 }
924
925 void ssb_device_enable(struct ssb_device *dev, u32 core_specific_flags)
926 {
927         u32 val;
928
929         ssb_device_disable(dev, core_specific_flags);
930         ssb_write32(dev, SSB_TMSLOW,
931                     SSB_TMSLOW_RESET | SSB_TMSLOW_CLOCK |
932                     SSB_TMSLOW_FGC | core_specific_flags);
933         ssb_flush_tmslow(dev);
934
935         /* Clear SERR if set. This is a hw bug workaround. */
936         if (ssb_read32(dev, SSB_TMSHIGH) & SSB_TMSHIGH_SERR)
937                 ssb_write32(dev, SSB_TMSHIGH, 0);
938
939         val = ssb_read32(dev, SSB_IMSTATE);
940         if (val & (SSB_IMSTATE_IBE | SSB_IMSTATE_TO)) {
941                 val &= ~(SSB_IMSTATE_IBE | SSB_IMSTATE_TO);
942                 ssb_write32(dev, SSB_IMSTATE, val);
943         }
944
945         ssb_write32(dev, SSB_TMSLOW,
946                     SSB_TMSLOW_CLOCK | SSB_TMSLOW_FGC |
947                     core_specific_flags);
948         ssb_flush_tmslow(dev);
949
950         ssb_write32(dev, SSB_TMSLOW, SSB_TMSLOW_CLOCK |
951                     core_specific_flags);
952         ssb_flush_tmslow(dev);
953 }
954 EXPORT_SYMBOL(ssb_device_enable);
955
956 /* Wait for a bit in a register to get set or unset.
957  * timeout is in units of ten-microseconds */
958 static int ssb_wait_bit(struct ssb_device *dev, u16 reg, u32 bitmask,
959                         int timeout, int set)
960 {
961         int i;
962         u32 val;
963
964         for (i = 0; i < timeout; i++) {
965                 val = ssb_read32(dev, reg);
966                 if (set) {
967                         if (val & bitmask)
968                                 return 0;
969                 } else {
970                         if (!(val & bitmask))
971                                 return 0;
972                 }
973                 udelay(10);
974         }
975         printk(KERN_ERR PFX "Timeout waiting for bitmask %08X on "
976                             "register %04X to %s.\n",
977                bitmask, reg, (set ? "set" : "clear"));
978
979         return -ETIMEDOUT;
980 }
981
982 void ssb_device_disable(struct ssb_device *dev, u32 core_specific_flags)
983 {
984         u32 reject;
985
986         if (ssb_read32(dev, SSB_TMSLOW) & SSB_TMSLOW_RESET)
987                 return;
988
989         reject = ssb_tmslow_reject_bitmask(dev);
990         ssb_write32(dev, SSB_TMSLOW, reject | SSB_TMSLOW_CLOCK);
991         ssb_wait_bit(dev, SSB_TMSLOW, reject, 1000, 1);
992         ssb_wait_bit(dev, SSB_TMSHIGH, SSB_TMSHIGH_BUSY, 1000, 0);
993         ssb_write32(dev, SSB_TMSLOW,
994                     SSB_TMSLOW_FGC | SSB_TMSLOW_CLOCK |
995                     reject | SSB_TMSLOW_RESET |
996                     core_specific_flags);
997         ssb_flush_tmslow(dev);
998
999         ssb_write32(dev, SSB_TMSLOW,
1000                     reject | SSB_TMSLOW_RESET |
1001                     core_specific_flags);
1002         ssb_flush_tmslow(dev);
1003 }
1004 EXPORT_SYMBOL(ssb_device_disable);
1005
1006 u32 ssb_dma_translation(struct ssb_device *dev)
1007 {
1008         switch (dev->bus->bustype) {
1009         case SSB_BUSTYPE_SSB:
1010                 return 0;
1011         case SSB_BUSTYPE_PCI:
1012         case SSB_BUSTYPE_PCMCIA:
1013                 return SSB_PCI_DMA;
1014         }
1015         return 0;
1016 }
1017 EXPORT_SYMBOL(ssb_dma_translation);
1018
1019 int ssb_dma_set_mask(struct ssb_device *ssb_dev, u64 mask)
1020 {
1021         struct device *dev = ssb_dev->dev;
1022
1023 #ifdef CONFIG_SSB_PCIHOST
1024         if (ssb_dev->bus->bustype == SSB_BUSTYPE_PCI &&
1025             !dma_supported(dev, mask))
1026                 return -EIO;
1027 #endif
1028         dev->coherent_dma_mask = mask;
1029         dev->dma_mask = &dev->coherent_dma_mask;
1030
1031         return 0;
1032 }
1033 EXPORT_SYMBOL(ssb_dma_set_mask);
1034
1035 int ssb_bus_may_powerdown(struct ssb_bus *bus)
1036 {
1037         struct ssb_chipcommon *cc;
1038         int err = 0;
1039
1040         /* On buses where more than one core may be working
1041          * at a time, we must not powerdown stuff if there are
1042          * still cores that may want to run. */
1043         if (bus->bustype == SSB_BUSTYPE_SSB)
1044                 goto out;
1045
1046         cc = &bus->chipco;
1047         ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
1048         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
1049         if (err)
1050                 goto error;
1051 out:
1052 #ifdef CONFIG_SSB_DEBUG
1053         bus->powered_up = 0;
1054 #endif
1055         return err;
1056 error:
1057         ssb_printk(KERN_ERR PFX "Bus powerdown failed\n");
1058         goto out;
1059 }
1060 EXPORT_SYMBOL(ssb_bus_may_powerdown);
1061
1062 int ssb_bus_powerup(struct ssb_bus *bus, bool dynamic_pctl)
1063 {
1064         struct ssb_chipcommon *cc;
1065         int err;
1066         enum ssb_clkmode mode;
1067
1068         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
1069         if (err)
1070                 goto error;
1071         cc = &bus->chipco;
1072         mode = dynamic_pctl ? SSB_CLKMODE_DYNAMIC : SSB_CLKMODE_FAST;
1073         ssb_chipco_set_clockmode(cc, mode);
1074
1075 #ifdef CONFIG_SSB_DEBUG
1076         bus->powered_up = 1;
1077 #endif
1078         return 0;
1079 error:
1080         ssb_printk(KERN_ERR PFX "Bus powerup failed\n");
1081         return err;
1082 }
1083 EXPORT_SYMBOL(ssb_bus_powerup);
1084
1085 u32 ssb_admatch_base(u32 adm)
1086 {
1087         u32 base = 0;
1088
1089         switch (adm & SSB_ADM_TYPE) {
1090         case SSB_ADM_TYPE0:
1091                 base = (adm & SSB_ADM_BASE0);
1092                 break;
1093         case SSB_ADM_TYPE1:
1094                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1095                 base = (adm & SSB_ADM_BASE1);
1096                 break;
1097         case SSB_ADM_TYPE2:
1098                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1099                 base = (adm & SSB_ADM_BASE2);
1100                 break;
1101         default:
1102                 SSB_WARN_ON(1);
1103         }
1104
1105         return base;
1106 }
1107 EXPORT_SYMBOL(ssb_admatch_base);
1108
1109 u32 ssb_admatch_size(u32 adm)
1110 {
1111         u32 size = 0;
1112
1113         switch (adm & SSB_ADM_TYPE) {
1114         case SSB_ADM_TYPE0:
1115                 size = ((adm & SSB_ADM_SZ0) >> SSB_ADM_SZ0_SHIFT);
1116                 break;
1117         case SSB_ADM_TYPE1:
1118                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1119                 size = ((adm & SSB_ADM_SZ1) >> SSB_ADM_SZ1_SHIFT);
1120                 break;
1121         case SSB_ADM_TYPE2:
1122                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1123                 size = ((adm & SSB_ADM_SZ2) >> SSB_ADM_SZ2_SHIFT);
1124                 break;
1125         default:
1126                 SSB_WARN_ON(1);
1127         }
1128         size = (1 << (size + 1));
1129
1130         return size;
1131 }
1132 EXPORT_SYMBOL(ssb_admatch_size);
1133
1134 static int __init ssb_modinit(void)
1135 {
1136         int err;
1137
1138         /* See the comment at the ssb_is_early_boot definition */
1139         ssb_is_early_boot = 0;
1140         err = bus_register(&ssb_bustype);
1141         if (err)
1142                 return err;
1143
1144         /* Maybe we already registered some buses at early boot.
1145          * Check for this and attach them
1146          */
1147         ssb_buses_lock();
1148         err = ssb_attach_queued_buses();
1149         ssb_buses_unlock();
1150         if (err)
1151                 bus_unregister(&ssb_bustype);
1152
1153         err = b43_pci_ssb_bridge_init();
1154         if (err) {
1155                 ssb_printk(KERN_ERR "Broadcom 43xx PCI-SSB-bridge "
1156                            "initialization failed");
1157                 /* don't fail SSB init because of this */
1158                 err = 0;
1159         }
1160
1161         return err;
1162 }
1163 /* ssb must be initialized after PCI but before the ssb drivers.
1164  * That means we must use some initcall between subsys_initcall
1165  * and device_initcall. */
1166 fs_initcall(ssb_modinit);
1167
1168 static void __exit ssb_modexit(void)
1169 {
1170         b43_pci_ssb_bridge_exit();
1171         bus_unregister(&ssb_bustype);
1172 }
1173 module_exit(ssb_modexit)