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