Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[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/ssb/ssb_driver_gige.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/pci.h>
20
21 #include <pcmcia/cs_types.h>
22 #include <pcmcia/cs.h>
23 #include <pcmcia/cistpl.h>
24 #include <pcmcia/ds.h>
25
26
27 MODULE_DESCRIPTION("Sonics Silicon Backplane driver");
28 MODULE_LICENSE("GPL");
29
30
31 /* Temporary list of yet-to-be-attached buses */
32 static LIST_HEAD(attach_queue);
33 /* List if running buses */
34 static LIST_HEAD(buses);
35 /* Software ID counter */
36 static unsigned int next_busnumber;
37 /* buses_mutes locks the two buslists and the next_busnumber.
38  * Don't lock this directly, but use ssb_buses_[un]lock() below. */
39 static DEFINE_MUTEX(buses_mutex);
40
41 /* There are differences in the codeflow, if the bus is
42  * initialized from early boot, as various needed services
43  * are not available early. This is a mechanism to delay
44  * these initializations to after early boot has finished.
45  * It's also used to avoid mutex locking, as that's not
46  * available and needed early. */
47 static bool ssb_is_early_boot = 1;
48
49 static void ssb_buses_lock(void);
50 static void ssb_buses_unlock(void);
51
52
53 #ifdef CONFIG_SSB_PCIHOST
54 struct ssb_bus *ssb_pci_dev_to_bus(struct pci_dev *pdev)
55 {
56         struct ssb_bus *bus;
57
58         ssb_buses_lock();
59         list_for_each_entry(bus, &buses, list) {
60                 if (bus->bustype == SSB_BUSTYPE_PCI &&
61                     bus->host_pci == pdev)
62                         goto found;
63         }
64         bus = NULL;
65 found:
66         ssb_buses_unlock();
67
68         return bus;
69 }
70 #endif /* CONFIG_SSB_PCIHOST */
71
72 #ifdef CONFIG_SSB_PCMCIAHOST
73 struct ssb_bus *ssb_pcmcia_dev_to_bus(struct pcmcia_device *pdev)
74 {
75         struct ssb_bus *bus;
76
77         ssb_buses_lock();
78         list_for_each_entry(bus, &buses, list) {
79                 if (bus->bustype == SSB_BUSTYPE_PCMCIA &&
80                     bus->host_pcmcia == pdev)
81                         goto found;
82         }
83         bus = NULL;
84 found:
85         ssb_buses_unlock();
86
87         return bus;
88 }
89 #endif /* CONFIG_SSB_PCMCIAHOST */
90
91 int ssb_for_each_bus_call(unsigned long data,
92                           int (*func)(struct ssb_bus *bus, unsigned long data))
93 {
94         struct ssb_bus *bus;
95         int res;
96
97         ssb_buses_lock();
98         list_for_each_entry(bus, &buses, list) {
99                 res = func(bus, data);
100                 if (res >= 0) {
101                         ssb_buses_unlock();
102                         return res;
103                 }
104         }
105         ssb_buses_unlock();
106
107         return -ENODEV;
108 }
109
110 static struct ssb_device *ssb_device_get(struct ssb_device *dev)
111 {
112         if (dev)
113                 get_device(dev->dev);
114         return dev;
115 }
116
117 static void ssb_device_put(struct ssb_device *dev)
118 {
119         if (dev)
120                 put_device(dev->dev);
121 }
122
123 static int ssb_device_resume(struct device *dev)
124 {
125         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
126         struct ssb_driver *ssb_drv;
127         int err = 0;
128
129         if (dev->driver) {
130                 ssb_drv = drv_to_ssb_drv(dev->driver);
131                 if (ssb_drv && ssb_drv->resume)
132                         err = ssb_drv->resume(ssb_dev);
133                 if (err)
134                         goto out;
135         }
136 out:
137         return err;
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         int err = 0;
145
146         if (dev->driver) {
147                 ssb_drv = drv_to_ssb_drv(dev->driver);
148                 if (ssb_drv && ssb_drv->suspend)
149                         err = ssb_drv->suspend(ssb_dev, state);
150                 if (err)
151                         goto out;
152         }
153 out:
154         return err;
155 }
156
157 int ssb_bus_resume(struct ssb_bus *bus)
158 {
159         int err;
160
161         /* Reset HW state information in memory, so that HW is
162          * completely reinitialized. */
163         bus->mapped_device = NULL;
164 #ifdef CONFIG_SSB_DRIVER_PCICORE
165         bus->pcicore.setup_done = 0;
166 #endif
167
168         err = ssb_bus_powerup(bus, 0);
169         if (err)
170                 return err;
171         err = ssb_pcmcia_hardware_setup(bus);
172         if (err) {
173                 ssb_bus_may_powerdown(bus);
174                 return err;
175         }
176         ssb_chipco_resume(&bus->chipco);
177         ssb_bus_may_powerdown(bus);
178
179         return 0;
180 }
181 EXPORT_SYMBOL(ssb_bus_resume);
182
183 int ssb_bus_suspend(struct ssb_bus *bus)
184 {
185         ssb_chipco_suspend(&bus->chipco);
186         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
187
188         return 0;
189 }
190 EXPORT_SYMBOL(ssb_bus_suspend);
191
192 #ifdef CONFIG_SSB_SPROM
193 int ssb_devices_freeze(struct ssb_bus *bus)
194 {
195         struct ssb_device *dev;
196         struct ssb_driver *drv;
197         int err = 0;
198         int i;
199         pm_message_t state = PMSG_FREEZE;
200
201         /* First check that we are capable to freeze all devices. */
202         for (i = 0; i < bus->nr_devices; i++) {
203                 dev = &(bus->devices[i]);
204                 if (!dev->dev ||
205                     !dev->dev->driver ||
206                     !device_is_registered(dev->dev))
207                         continue;
208                 drv = drv_to_ssb_drv(dev->dev->driver);
209                 if (!drv)
210                         continue;
211                 if (!drv->suspend) {
212                         /* Nope, can't suspend this one. */
213                         return -EOPNOTSUPP;
214                 }
215         }
216         /* Now suspend all devices */
217         for (i = 0; i < bus->nr_devices; i++) {
218                 dev = &(bus->devices[i]);
219                 if (!dev->dev ||
220                     !dev->dev->driver ||
221                     !device_is_registered(dev->dev))
222                         continue;
223                 drv = drv_to_ssb_drv(dev->dev->driver);
224                 if (!drv)
225                         continue;
226                 err = drv->suspend(dev, state);
227                 if (err) {
228                         ssb_printk(KERN_ERR PFX "Failed to freeze device %s\n",
229                                    dev->dev->bus_id);
230                         goto err_unwind;
231                 }
232         }
233
234         return 0;
235 err_unwind:
236         for (i--; i >= 0; i--) {
237                 dev = &(bus->devices[i]);
238                 if (!dev->dev ||
239                     !dev->dev->driver ||
240                     !device_is_registered(dev->dev))
241                         continue;
242                 drv = drv_to_ssb_drv(dev->dev->driver);
243                 if (!drv)
244                         continue;
245                 if (drv->resume)
246                         drv->resume(dev);
247         }
248         return err;
249 }
250
251 int ssb_devices_thaw(struct ssb_bus *bus)
252 {
253         struct ssb_device *dev;
254         struct ssb_driver *drv;
255         int err;
256         int i;
257
258         for (i = 0; i < bus->nr_devices; i++) {
259                 dev = &(bus->devices[i]);
260                 if (!dev->dev ||
261                     !dev->dev->driver ||
262                     !device_is_registered(dev->dev))
263                         continue;
264                 drv = drv_to_ssb_drv(dev->dev->driver);
265                 if (!drv)
266                         continue;
267                 if (SSB_WARN_ON(!drv->resume))
268                         continue;
269                 err = drv->resume(dev);
270                 if (err) {
271                         ssb_printk(KERN_ERR PFX "Failed to thaw device %s\n",
272                                    dev->dev->bus_id);
273                 }
274         }
275
276         return 0;
277 }
278 #endif /* CONFIG_SSB_SPROM */
279
280 static void ssb_device_shutdown(struct device *dev)
281 {
282         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
283         struct ssb_driver *ssb_drv;
284
285         if (!dev->driver)
286                 return;
287         ssb_drv = drv_to_ssb_drv(dev->driver);
288         if (ssb_drv && ssb_drv->shutdown)
289                 ssb_drv->shutdown(ssb_dev);
290 }
291
292 static int ssb_device_remove(struct device *dev)
293 {
294         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
295         struct ssb_driver *ssb_drv = drv_to_ssb_drv(dev->driver);
296
297         if (ssb_drv && ssb_drv->remove)
298                 ssb_drv->remove(ssb_dev);
299         ssb_device_put(ssb_dev);
300
301         return 0;
302 }
303
304 static int ssb_device_probe(struct device *dev)
305 {
306         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
307         struct ssb_driver *ssb_drv = drv_to_ssb_drv(dev->driver);
308         int err = 0;
309
310         ssb_device_get(ssb_dev);
311         if (ssb_drv && ssb_drv->probe)
312                 err = ssb_drv->probe(ssb_dev, &ssb_dev->id);
313         if (err)
314                 ssb_device_put(ssb_dev);
315
316         return err;
317 }
318
319 static int ssb_match_devid(const struct ssb_device_id *tabid,
320                            const struct ssb_device_id *devid)
321 {
322         if ((tabid->vendor != devid->vendor) &&
323             tabid->vendor != SSB_ANY_VENDOR)
324                 return 0;
325         if ((tabid->coreid != devid->coreid) &&
326             tabid->coreid != SSB_ANY_ID)
327                 return 0;
328         if ((tabid->revision != devid->revision) &&
329             tabid->revision != SSB_ANY_REV)
330                 return 0;
331         return 1;
332 }
333
334 static int ssb_bus_match(struct device *dev, struct device_driver *drv)
335 {
336         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
337         struct ssb_driver *ssb_drv = drv_to_ssb_drv(drv);
338         const struct ssb_device_id *id;
339
340         for (id = ssb_drv->id_table;
341              id->vendor || id->coreid || id->revision;
342              id++) {
343                 if (ssb_match_devid(id, &ssb_dev->id))
344                         return 1; /* found */
345         }
346
347         return 0;
348 }
349
350 static int ssb_device_uevent(struct device *dev, struct kobj_uevent_env *env)
351 {
352         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
353
354         if (!dev)
355                 return -ENODEV;
356
357         return add_uevent_var(env,
358                              "MODALIAS=ssb:v%04Xid%04Xrev%02X",
359                              ssb_dev->id.vendor, ssb_dev->id.coreid,
360                              ssb_dev->id.revision);
361 }
362
363 static struct bus_type ssb_bustype = {
364         .name           = "ssb",
365         .match          = ssb_bus_match,
366         .probe          = ssb_device_probe,
367         .remove         = ssb_device_remove,
368         .shutdown       = ssb_device_shutdown,
369         .suspend        = ssb_device_suspend,
370         .resume         = ssb_device_resume,
371         .uevent         = ssb_device_uevent,
372 };
373
374 static void ssb_buses_lock(void)
375 {
376         /* See the comment at the ssb_is_early_boot definition */
377         if (!ssb_is_early_boot)
378                 mutex_lock(&buses_mutex);
379 }
380
381 static void ssb_buses_unlock(void)
382 {
383         /* See the comment at the ssb_is_early_boot definition */
384         if (!ssb_is_early_boot)
385                 mutex_unlock(&buses_mutex);
386 }
387
388 static void ssb_devices_unregister(struct ssb_bus *bus)
389 {
390         struct ssb_device *sdev;
391         int i;
392
393         for (i = bus->nr_devices - 1; i >= 0; i--) {
394                 sdev = &(bus->devices[i]);
395                 if (sdev->dev)
396                         device_unregister(sdev->dev);
397         }
398 }
399
400 void ssb_bus_unregister(struct ssb_bus *bus)
401 {
402         ssb_buses_lock();
403         ssb_devices_unregister(bus);
404         list_del(&bus->list);
405         ssb_buses_unlock();
406
407         ssb_pcmcia_exit(bus);
408         ssb_pci_exit(bus);
409         ssb_iounmap(bus);
410 }
411 EXPORT_SYMBOL(ssb_bus_unregister);
412
413 static void ssb_release_dev(struct device *dev)
414 {
415         struct __ssb_dev_wrapper *devwrap;
416
417         devwrap = container_of(dev, struct __ssb_dev_wrapper, dev);
418         kfree(devwrap);
419 }
420
421 static int ssb_devices_register(struct ssb_bus *bus)
422 {
423         struct ssb_device *sdev;
424         struct device *dev;
425         struct __ssb_dev_wrapper *devwrap;
426         int i, err = 0;
427         int dev_idx = 0;
428
429         for (i = 0; i < bus->nr_devices; i++) {
430                 sdev = &(bus->devices[i]);
431
432                 /* We don't register SSB-system devices to the kernel,
433                  * as the drivers for them are built into SSB. */
434                 switch (sdev->id.coreid) {
435                 case SSB_DEV_CHIPCOMMON:
436                 case SSB_DEV_PCI:
437                 case SSB_DEV_PCIE:
438                 case SSB_DEV_PCMCIA:
439                 case SSB_DEV_MIPS:
440                 case SSB_DEV_MIPS_3302:
441                 case SSB_DEV_EXTIF:
442                         continue;
443                 }
444
445                 devwrap = kzalloc(sizeof(*devwrap), GFP_KERNEL);
446                 if (!devwrap) {
447                         ssb_printk(KERN_ERR PFX
448                                    "Could not allocate device\n");
449                         err = -ENOMEM;
450                         goto error;
451                 }
452                 dev = &devwrap->dev;
453                 devwrap->sdev = sdev;
454
455                 dev->release = ssb_release_dev;
456                 dev->bus = &ssb_bustype;
457                 snprintf(dev->bus_id, sizeof(dev->bus_id),
458                          "ssb%u:%d", bus->busnumber, dev_idx);
459
460                 switch (bus->bustype) {
461                 case SSB_BUSTYPE_PCI:
462 #ifdef CONFIG_SSB_PCIHOST
463                         sdev->irq = bus->host_pci->irq;
464                         dev->parent = &bus->host_pci->dev;
465 #endif
466                         break;
467                 case SSB_BUSTYPE_PCMCIA:
468 #ifdef CONFIG_SSB_PCMCIAHOST
469                         sdev->irq = bus->host_pcmcia->irq.AssignedIRQ;
470                         dev->parent = &bus->host_pcmcia->dev;
471 #endif
472                         break;
473                 case SSB_BUSTYPE_SSB:
474                         break;
475                 }
476
477                 sdev->dev = dev;
478                 err = device_register(dev);
479                 if (err) {
480                         ssb_printk(KERN_ERR PFX
481                                    "Could not register %s\n",
482                                    dev->bus_id);
483                         /* Set dev to NULL to not unregister
484                          * dev on error unwinding. */
485                         sdev->dev = NULL;
486                         kfree(devwrap);
487                         goto error;
488                 }
489                 dev_idx++;
490         }
491
492         return 0;
493 error:
494         /* Unwind the already registered devices. */
495         ssb_devices_unregister(bus);
496         return err;
497 }
498
499 /* Needs ssb_buses_lock() */
500 static int ssb_attach_queued_buses(void)
501 {
502         struct ssb_bus *bus, *n;
503         int err = 0;
504         int drop_them_all = 0;
505
506         list_for_each_entry_safe(bus, n, &attach_queue, list) {
507                 if (drop_them_all) {
508                         list_del(&bus->list);
509                         continue;
510                 }
511                 /* Can't init the PCIcore in ssb_bus_register(), as that
512                  * is too early in boot for embedded systems
513                  * (no udelay() available). So do it here in attach stage.
514                  */
515                 err = ssb_bus_powerup(bus, 0);
516                 if (err)
517                         goto error;
518                 ssb_pcicore_init(&bus->pcicore);
519                 ssb_bus_may_powerdown(bus);
520
521                 err = ssb_devices_register(bus);
522 error:
523                 if (err) {
524                         drop_them_all = 1;
525                         list_del(&bus->list);
526                         continue;
527                 }
528                 list_move_tail(&bus->list, &buses);
529         }
530
531         return err;
532 }
533
534 static u8 ssb_ssb_read8(struct ssb_device *dev, u16 offset)
535 {
536         struct ssb_bus *bus = dev->bus;
537
538         offset += dev->core_index * SSB_CORE_SIZE;
539         return readb(bus->mmio + offset);
540 }
541
542 static u16 ssb_ssb_read16(struct ssb_device *dev, u16 offset)
543 {
544         struct ssb_bus *bus = dev->bus;
545
546         offset += dev->core_index * SSB_CORE_SIZE;
547         return readw(bus->mmio + offset);
548 }
549
550 static u32 ssb_ssb_read32(struct ssb_device *dev, u16 offset)
551 {
552         struct ssb_bus *bus = dev->bus;
553
554         offset += dev->core_index * SSB_CORE_SIZE;
555         return readl(bus->mmio + offset);
556 }
557
558 #ifdef CONFIG_SSB_BLOCKIO
559 static void ssb_ssb_block_read(struct ssb_device *dev, void *buffer,
560                                size_t count, u16 offset, u8 reg_width)
561 {
562         struct ssb_bus *bus = dev->bus;
563         void __iomem *addr;
564
565         offset += dev->core_index * SSB_CORE_SIZE;
566         addr = bus->mmio + offset;
567
568         switch (reg_width) {
569         case sizeof(u8): {
570                 u8 *buf = buffer;
571
572                 while (count) {
573                         *buf = __raw_readb(addr);
574                         buf++;
575                         count--;
576                 }
577                 break;
578         }
579         case sizeof(u16): {
580                 __le16 *buf = buffer;
581
582                 SSB_WARN_ON(count & 1);
583                 while (count) {
584                         *buf = (__force __le16)__raw_readw(addr);
585                         buf++;
586                         count -= 2;
587                 }
588                 break;
589         }
590         case sizeof(u32): {
591                 __le32 *buf = buffer;
592
593                 SSB_WARN_ON(count & 3);
594                 while (count) {
595                         *buf = (__force __le32)__raw_readl(addr);
596                         buf++;
597                         count -= 4;
598                 }
599                 break;
600         }
601         default:
602                 SSB_WARN_ON(1);
603         }
604 }
605 #endif /* CONFIG_SSB_BLOCKIO */
606
607 static void ssb_ssb_write8(struct ssb_device *dev, u16 offset, u8 value)
608 {
609         struct ssb_bus *bus = dev->bus;
610
611         offset += dev->core_index * SSB_CORE_SIZE;
612         writeb(value, bus->mmio + offset);
613 }
614
615 static void ssb_ssb_write16(struct ssb_device *dev, u16 offset, u16 value)
616 {
617         struct ssb_bus *bus = dev->bus;
618
619         offset += dev->core_index * SSB_CORE_SIZE;
620         writew(value, bus->mmio + offset);
621 }
622
623 static void ssb_ssb_write32(struct ssb_device *dev, u16 offset, u32 value)
624 {
625         struct ssb_bus *bus = dev->bus;
626
627         offset += dev->core_index * SSB_CORE_SIZE;
628         writel(value, bus->mmio + offset);
629 }
630
631 #ifdef CONFIG_SSB_BLOCKIO
632 static void ssb_ssb_block_write(struct ssb_device *dev, const void *buffer,
633                                 size_t count, u16 offset, u8 reg_width)
634 {
635         struct ssb_bus *bus = dev->bus;
636         void __iomem *addr;
637
638         offset += dev->core_index * SSB_CORE_SIZE;
639         addr = bus->mmio + offset;
640
641         switch (reg_width) {
642         case sizeof(u8): {
643                 const u8 *buf = buffer;
644
645                 while (count) {
646                         __raw_writeb(*buf, addr);
647                         buf++;
648                         count--;
649                 }
650                 break;
651         }
652         case sizeof(u16): {
653                 const __le16 *buf = buffer;
654
655                 SSB_WARN_ON(count & 1);
656                 while (count) {
657                         __raw_writew((__force u16)(*buf), addr);
658                         buf++;
659                         count -= 2;
660                 }
661                 break;
662         }
663         case sizeof(u32): {
664                 const __le32 *buf = buffer;
665
666                 SSB_WARN_ON(count & 3);
667                 while (count) {
668                         __raw_writel((__force u32)(*buf), addr);
669                         buf++;
670                         count -= 4;
671                 }
672                 break;
673         }
674         default:
675                 SSB_WARN_ON(1);
676         }
677 }
678 #endif /* CONFIG_SSB_BLOCKIO */
679
680 /* Ops for the plain SSB bus without a host-device (no PCI or PCMCIA). */
681 static const struct ssb_bus_ops ssb_ssb_ops = {
682         .read8          = ssb_ssb_read8,
683         .read16         = ssb_ssb_read16,
684         .read32         = ssb_ssb_read32,
685         .write8         = ssb_ssb_write8,
686         .write16        = ssb_ssb_write16,
687         .write32        = ssb_ssb_write32,
688 #ifdef CONFIG_SSB_BLOCKIO
689         .block_read     = ssb_ssb_block_read,
690         .block_write    = ssb_ssb_block_write,
691 #endif
692 };
693
694 static int ssb_fetch_invariants(struct ssb_bus *bus,
695                                 ssb_invariants_func_t get_invariants)
696 {
697         struct ssb_init_invariants iv;
698         int err;
699
700         memset(&iv, 0, sizeof(iv));
701         err = get_invariants(bus, &iv);
702         if (err)
703                 goto out;
704         memcpy(&bus->boardinfo, &iv.boardinfo, sizeof(iv.boardinfo));
705         memcpy(&bus->sprom, &iv.sprom, sizeof(iv.sprom));
706         bus->has_cardbus_slot = iv.has_cardbus_slot;
707 out:
708         return err;
709 }
710
711 static int ssb_bus_register(struct ssb_bus *bus,
712                             ssb_invariants_func_t get_invariants,
713                             unsigned long baseaddr)
714 {
715         int err;
716
717         spin_lock_init(&bus->bar_lock);
718         INIT_LIST_HEAD(&bus->list);
719 #ifdef CONFIG_SSB_EMBEDDED
720         spin_lock_init(&bus->gpio_lock);
721 #endif
722
723         /* Powerup the bus */
724         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
725         if (err)
726                 goto out;
727         ssb_buses_lock();
728         bus->busnumber = next_busnumber;
729         /* Scan for devices (cores) */
730         err = ssb_bus_scan(bus, baseaddr);
731         if (err)
732                 goto err_disable_xtal;
733
734         /* Init PCI-host device (if any) */
735         err = ssb_pci_init(bus);
736         if (err)
737                 goto err_unmap;
738         /* Init PCMCIA-host device (if any) */
739         err = ssb_pcmcia_init(bus);
740         if (err)
741                 goto err_pci_exit;
742
743         /* Initialize basic system devices (if available) */
744         err = ssb_bus_powerup(bus, 0);
745         if (err)
746                 goto err_pcmcia_exit;
747         ssb_chipcommon_init(&bus->chipco);
748         ssb_mipscore_init(&bus->mipscore);
749         err = ssb_fetch_invariants(bus, get_invariants);
750         if (err) {
751                 ssb_bus_may_powerdown(bus);
752                 goto err_pcmcia_exit;
753         }
754         ssb_bus_may_powerdown(bus);
755
756         /* Queue it for attach.
757          * See the comment at the ssb_is_early_boot definition. */
758         list_add_tail(&bus->list, &attach_queue);
759         if (!ssb_is_early_boot) {
760                 /* This is not early boot, so we must attach the bus now */
761                 err = ssb_attach_queued_buses();
762                 if (err)
763                         goto err_dequeue;
764         }
765         next_busnumber++;
766         ssb_buses_unlock();
767
768 out:
769         return err;
770
771 err_dequeue:
772         list_del(&bus->list);
773 err_pcmcia_exit:
774         ssb_pcmcia_exit(bus);
775 err_pci_exit:
776         ssb_pci_exit(bus);
777 err_unmap:
778         ssb_iounmap(bus);
779 err_disable_xtal:
780         ssb_buses_unlock();
781         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
782         return err;
783 }
784
785 #ifdef CONFIG_SSB_PCIHOST
786 int ssb_bus_pcibus_register(struct ssb_bus *bus,
787                             struct pci_dev *host_pci)
788 {
789         int err;
790
791         bus->bustype = SSB_BUSTYPE_PCI;
792         bus->host_pci = host_pci;
793         bus->ops = &ssb_pci_ops;
794
795         err = ssb_bus_register(bus, ssb_pci_get_invariants, 0);
796         if (!err) {
797                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
798                            "PCI device %s\n", host_pci->dev.bus_id);
799         }
800
801         return err;
802 }
803 EXPORT_SYMBOL(ssb_bus_pcibus_register);
804 #endif /* CONFIG_SSB_PCIHOST */
805
806 #ifdef CONFIG_SSB_PCMCIAHOST
807 int ssb_bus_pcmciabus_register(struct ssb_bus *bus,
808                                struct pcmcia_device *pcmcia_dev,
809                                unsigned long baseaddr)
810 {
811         int err;
812
813         bus->bustype = SSB_BUSTYPE_PCMCIA;
814         bus->host_pcmcia = pcmcia_dev;
815         bus->ops = &ssb_pcmcia_ops;
816
817         err = ssb_bus_register(bus, ssb_pcmcia_get_invariants, baseaddr);
818         if (!err) {
819                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
820                            "PCMCIA device %s\n", pcmcia_dev->devname);
821         }
822
823         return err;
824 }
825 EXPORT_SYMBOL(ssb_bus_pcmciabus_register);
826 #endif /* CONFIG_SSB_PCMCIAHOST */
827
828 int ssb_bus_ssbbus_register(struct ssb_bus *bus,
829                             unsigned long baseaddr,
830                             ssb_invariants_func_t get_invariants)
831 {
832         int err;
833
834         bus->bustype = SSB_BUSTYPE_SSB;
835         bus->ops = &ssb_ssb_ops;
836
837         err = ssb_bus_register(bus, get_invariants, baseaddr);
838         if (!err) {
839                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found at "
840                            "address 0x%08lX\n", baseaddr);
841         }
842
843         return err;
844 }
845
846 int __ssb_driver_register(struct ssb_driver *drv, struct module *owner)
847 {
848         drv->drv.name = drv->name;
849         drv->drv.bus = &ssb_bustype;
850         drv->drv.owner = owner;
851
852         return driver_register(&drv->drv);
853 }
854 EXPORT_SYMBOL(__ssb_driver_register);
855
856 void ssb_driver_unregister(struct ssb_driver *drv)
857 {
858         driver_unregister(&drv->drv);
859 }
860 EXPORT_SYMBOL(ssb_driver_unregister);
861
862 void ssb_set_devtypedata(struct ssb_device *dev, void *data)
863 {
864         struct ssb_bus *bus = dev->bus;
865         struct ssb_device *ent;
866         int i;
867
868         for (i = 0; i < bus->nr_devices; i++) {
869                 ent = &(bus->devices[i]);
870                 if (ent->id.vendor != dev->id.vendor)
871                         continue;
872                 if (ent->id.coreid != dev->id.coreid)
873                         continue;
874
875                 ent->devtypedata = data;
876         }
877 }
878 EXPORT_SYMBOL(ssb_set_devtypedata);
879
880 static u32 clkfactor_f6_resolve(u32 v)
881 {
882         /* map the magic values */
883         switch (v) {
884         case SSB_CHIPCO_CLK_F6_2:
885                 return 2;
886         case SSB_CHIPCO_CLK_F6_3:
887                 return 3;
888         case SSB_CHIPCO_CLK_F6_4:
889                 return 4;
890         case SSB_CHIPCO_CLK_F6_5:
891                 return 5;
892         case SSB_CHIPCO_CLK_F6_6:
893                 return 6;
894         case SSB_CHIPCO_CLK_F6_7:
895                 return 7;
896         }
897         return 0;
898 }
899
900 /* Calculate the speed the backplane would run at a given set of clockcontrol values */
901 u32 ssb_calc_clock_rate(u32 plltype, u32 n, u32 m)
902 {
903         u32 n1, n2, clock, m1, m2, m3, mc;
904
905         n1 = (n & SSB_CHIPCO_CLK_N1);
906         n2 = ((n & SSB_CHIPCO_CLK_N2) >> SSB_CHIPCO_CLK_N2_SHIFT);
907
908         switch (plltype) {
909         case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
910                 if (m & SSB_CHIPCO_CLK_T6_MMASK)
911                         return SSB_CHIPCO_CLK_T6_M0;
912                 return SSB_CHIPCO_CLK_T6_M1;
913         case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
914         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
915         case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
916         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
917                 n1 = clkfactor_f6_resolve(n1);
918                 n2 += SSB_CHIPCO_CLK_F5_BIAS;
919                 break;
920         case SSB_PLLTYPE_2: /* 48Mhz, 4 dividers */
921                 n1 += SSB_CHIPCO_CLK_T2_BIAS;
922                 n2 += SSB_CHIPCO_CLK_T2_BIAS;
923                 SSB_WARN_ON(!((n1 >= 2) && (n1 <= 7)));
924                 SSB_WARN_ON(!((n2 >= 5) && (n2 <= 23)));
925                 break;
926         case SSB_PLLTYPE_5: /* 25Mhz, 4 dividers */
927                 return 100000000;
928         default:
929                 SSB_WARN_ON(1);
930         }
931
932         switch (plltype) {
933         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
934         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
935                 clock = SSB_CHIPCO_CLK_BASE2 * n1 * n2;
936                 break;
937         default:
938                 clock = SSB_CHIPCO_CLK_BASE1 * n1 * n2;
939         }
940         if (!clock)
941                 return 0;
942
943         m1 = (m & SSB_CHIPCO_CLK_M1);
944         m2 = ((m & SSB_CHIPCO_CLK_M2) >> SSB_CHIPCO_CLK_M2_SHIFT);
945         m3 = ((m & SSB_CHIPCO_CLK_M3) >> SSB_CHIPCO_CLK_M3_SHIFT);
946         mc = ((m & SSB_CHIPCO_CLK_MC) >> SSB_CHIPCO_CLK_MC_SHIFT);
947
948         switch (plltype) {
949         case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
950         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
951         case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
952         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
953                 m1 = clkfactor_f6_resolve(m1);
954                 if ((plltype == SSB_PLLTYPE_1) ||
955                     (plltype == SSB_PLLTYPE_3))
956                         m2 += SSB_CHIPCO_CLK_F5_BIAS;
957                 else
958                         m2 = clkfactor_f6_resolve(m2);
959                 m3 = clkfactor_f6_resolve(m3);
960
961                 switch (mc) {
962                 case SSB_CHIPCO_CLK_MC_BYPASS:
963                         return clock;
964                 case SSB_CHIPCO_CLK_MC_M1:
965                         return (clock / m1);
966                 case SSB_CHIPCO_CLK_MC_M1M2:
967                         return (clock / (m1 * m2));
968                 case SSB_CHIPCO_CLK_MC_M1M2M3:
969                         return (clock / (m1 * m2 * m3));
970                 case SSB_CHIPCO_CLK_MC_M1M3:
971                         return (clock / (m1 * m3));
972                 }
973                 return 0;
974         case SSB_PLLTYPE_2:
975                 m1 += SSB_CHIPCO_CLK_T2_BIAS;
976                 m2 += SSB_CHIPCO_CLK_T2M2_BIAS;
977                 m3 += SSB_CHIPCO_CLK_T2_BIAS;
978                 SSB_WARN_ON(!((m1 >= 2) && (m1 <= 7)));
979                 SSB_WARN_ON(!((m2 >= 3) && (m2 <= 10)));
980                 SSB_WARN_ON(!((m3 >= 2) && (m3 <= 7)));
981
982                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M1BYP))
983                         clock /= m1;
984                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M2BYP))
985                         clock /= m2;
986                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M3BYP))
987                         clock /= m3;
988                 return clock;
989         default:
990                 SSB_WARN_ON(1);
991         }
992         return 0;
993 }
994
995 /* Get the current speed the backplane is running at */
996 u32 ssb_clockspeed(struct ssb_bus *bus)
997 {
998         u32 rate;
999         u32 plltype;
1000         u32 clkctl_n, clkctl_m;
1001
1002         if (ssb_extif_available(&bus->extif))
1003                 ssb_extif_get_clockcontrol(&bus->extif, &plltype,
1004                                            &clkctl_n, &clkctl_m);
1005         else if (bus->chipco.dev)
1006                 ssb_chipco_get_clockcontrol(&bus->chipco, &plltype,
1007                                             &clkctl_n, &clkctl_m);
1008         else
1009                 return 0;
1010
1011         if (bus->chip_id == 0x5365) {
1012                 rate = 100000000;
1013         } else {
1014                 rate = ssb_calc_clock_rate(plltype, clkctl_n, clkctl_m);
1015                 if (plltype == SSB_PLLTYPE_3) /* 25Mhz, 2 dividers */
1016                         rate /= 2;
1017         }
1018
1019         return rate;
1020 }
1021 EXPORT_SYMBOL(ssb_clockspeed);
1022
1023 static u32 ssb_tmslow_reject_bitmask(struct ssb_device *dev)
1024 {
1025         u32 rev = ssb_read32(dev, SSB_IDLOW) & SSB_IDLOW_SSBREV;
1026
1027         /* The REJECT bit changed position in TMSLOW between
1028          * Backplane revisions. */
1029         switch (rev) {
1030         case SSB_IDLOW_SSBREV_22:
1031                 return SSB_TMSLOW_REJECT_22;
1032         case SSB_IDLOW_SSBREV_23:
1033                 return SSB_TMSLOW_REJECT_23;
1034         case SSB_IDLOW_SSBREV_24:     /* TODO - find the proper REJECT bits */
1035         case SSB_IDLOW_SSBREV_25:     /* same here */
1036         case SSB_IDLOW_SSBREV_26:     /* same here */
1037         case SSB_IDLOW_SSBREV_27:     /* same here */
1038                 return SSB_TMSLOW_REJECT_23;    /* this is a guess */
1039         default:
1040                 printk(KERN_INFO "ssb: Backplane Revision 0x%.8X\n", rev);
1041                 WARN_ON(1);
1042         }
1043         return (SSB_TMSLOW_REJECT_22 | SSB_TMSLOW_REJECT_23);
1044 }
1045
1046 int ssb_device_is_enabled(struct ssb_device *dev)
1047 {
1048         u32 val;
1049         u32 reject;
1050
1051         reject = ssb_tmslow_reject_bitmask(dev);
1052         val = ssb_read32(dev, SSB_TMSLOW);
1053         val &= SSB_TMSLOW_CLOCK | SSB_TMSLOW_RESET | reject;
1054
1055         return (val == SSB_TMSLOW_CLOCK);
1056 }
1057 EXPORT_SYMBOL(ssb_device_is_enabled);
1058
1059 static void ssb_flush_tmslow(struct ssb_device *dev)
1060 {
1061         /* Make _really_ sure the device has finished the TMSLOW
1062          * register write transaction, as we risk running into
1063          * a machine check exception otherwise.
1064          * Do this by reading the register back to commit the
1065          * PCI write and delay an additional usec for the device
1066          * to react to the change. */
1067         ssb_read32(dev, SSB_TMSLOW);
1068         udelay(1);
1069 }
1070
1071 void ssb_device_enable(struct ssb_device *dev, u32 core_specific_flags)
1072 {
1073         u32 val;
1074
1075         ssb_device_disable(dev, core_specific_flags);
1076         ssb_write32(dev, SSB_TMSLOW,
1077                     SSB_TMSLOW_RESET | SSB_TMSLOW_CLOCK |
1078                     SSB_TMSLOW_FGC | core_specific_flags);
1079         ssb_flush_tmslow(dev);
1080
1081         /* Clear SERR if set. This is a hw bug workaround. */
1082         if (ssb_read32(dev, SSB_TMSHIGH) & SSB_TMSHIGH_SERR)
1083                 ssb_write32(dev, SSB_TMSHIGH, 0);
1084
1085         val = ssb_read32(dev, SSB_IMSTATE);
1086         if (val & (SSB_IMSTATE_IBE | SSB_IMSTATE_TO)) {
1087                 val &= ~(SSB_IMSTATE_IBE | SSB_IMSTATE_TO);
1088                 ssb_write32(dev, SSB_IMSTATE, val);
1089         }
1090
1091         ssb_write32(dev, SSB_TMSLOW,
1092                     SSB_TMSLOW_CLOCK | SSB_TMSLOW_FGC |
1093                     core_specific_flags);
1094         ssb_flush_tmslow(dev);
1095
1096         ssb_write32(dev, SSB_TMSLOW, SSB_TMSLOW_CLOCK |
1097                     core_specific_flags);
1098         ssb_flush_tmslow(dev);
1099 }
1100 EXPORT_SYMBOL(ssb_device_enable);
1101
1102 /* Wait for a bit in a register to get set or unset.
1103  * timeout is in units of ten-microseconds */
1104 static int ssb_wait_bit(struct ssb_device *dev, u16 reg, u32 bitmask,
1105                         int timeout, int set)
1106 {
1107         int i;
1108         u32 val;
1109
1110         for (i = 0; i < timeout; i++) {
1111                 val = ssb_read32(dev, reg);
1112                 if (set) {
1113                         if (val & bitmask)
1114                                 return 0;
1115                 } else {
1116                         if (!(val & bitmask))
1117                                 return 0;
1118                 }
1119                 udelay(10);
1120         }
1121         printk(KERN_ERR PFX "Timeout waiting for bitmask %08X on "
1122                             "register %04X to %s.\n",
1123                bitmask, reg, (set ? "set" : "clear"));
1124
1125         return -ETIMEDOUT;
1126 }
1127
1128 void ssb_device_disable(struct ssb_device *dev, u32 core_specific_flags)
1129 {
1130         u32 reject;
1131
1132         if (ssb_read32(dev, SSB_TMSLOW) & SSB_TMSLOW_RESET)
1133                 return;
1134
1135         reject = ssb_tmslow_reject_bitmask(dev);
1136         ssb_write32(dev, SSB_TMSLOW, reject | SSB_TMSLOW_CLOCK);
1137         ssb_wait_bit(dev, SSB_TMSLOW, reject, 1000, 1);
1138         ssb_wait_bit(dev, SSB_TMSHIGH, SSB_TMSHIGH_BUSY, 1000, 0);
1139         ssb_write32(dev, SSB_TMSLOW,
1140                     SSB_TMSLOW_FGC | SSB_TMSLOW_CLOCK |
1141                     reject | SSB_TMSLOW_RESET |
1142                     core_specific_flags);
1143         ssb_flush_tmslow(dev);
1144
1145         ssb_write32(dev, SSB_TMSLOW,
1146                     reject | SSB_TMSLOW_RESET |
1147                     core_specific_flags);
1148         ssb_flush_tmslow(dev);
1149 }
1150 EXPORT_SYMBOL(ssb_device_disable);
1151
1152 u32 ssb_dma_translation(struct ssb_device *dev)
1153 {
1154         switch (dev->bus->bustype) {
1155         case SSB_BUSTYPE_SSB:
1156         case SSB_BUSTYPE_PCMCIA:
1157                 return 0;
1158         case SSB_BUSTYPE_PCI:
1159                 return SSB_PCI_DMA;
1160         }
1161         return 0;
1162 }
1163 EXPORT_SYMBOL(ssb_dma_translation);
1164
1165 int ssb_dma_set_mask(struct ssb_device *ssb_dev, u64 mask)
1166 {
1167         struct device *dev = ssb_dev->dev;
1168
1169 #ifdef CONFIG_SSB_PCIHOST
1170         if (ssb_dev->bus->bustype == SSB_BUSTYPE_PCI &&
1171             !dma_supported(dev, mask))
1172                 return -EIO;
1173 #endif
1174         dev->coherent_dma_mask = mask;
1175         dev->dma_mask = &dev->coherent_dma_mask;
1176
1177         return 0;
1178 }
1179 EXPORT_SYMBOL(ssb_dma_set_mask);
1180
1181 int ssb_bus_may_powerdown(struct ssb_bus *bus)
1182 {
1183         struct ssb_chipcommon *cc;
1184         int err = 0;
1185
1186         /* On buses where more than one core may be working
1187          * at a time, we must not powerdown stuff if there are
1188          * still cores that may want to run. */
1189         if (bus->bustype == SSB_BUSTYPE_SSB)
1190                 goto out;
1191
1192         cc = &bus->chipco;
1193
1194         if (!cc->dev)
1195                 goto out;
1196         if (cc->dev->id.revision < 5)
1197                 goto out;
1198
1199         ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
1200         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
1201         if (err)
1202                 goto error;
1203 out:
1204 #ifdef CONFIG_SSB_DEBUG
1205         bus->powered_up = 0;
1206 #endif
1207         return err;
1208 error:
1209         ssb_printk(KERN_ERR PFX "Bus powerdown failed\n");
1210         goto out;
1211 }
1212 EXPORT_SYMBOL(ssb_bus_may_powerdown);
1213
1214 int ssb_bus_powerup(struct ssb_bus *bus, bool dynamic_pctl)
1215 {
1216         struct ssb_chipcommon *cc;
1217         int err;
1218         enum ssb_clkmode mode;
1219
1220         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
1221         if (err)
1222                 goto error;
1223         cc = &bus->chipco;
1224         mode = dynamic_pctl ? SSB_CLKMODE_DYNAMIC : SSB_CLKMODE_FAST;
1225         ssb_chipco_set_clockmode(cc, mode);
1226
1227 #ifdef CONFIG_SSB_DEBUG
1228         bus->powered_up = 1;
1229 #endif
1230         return 0;
1231 error:
1232         ssb_printk(KERN_ERR PFX "Bus powerup failed\n");
1233         return err;
1234 }
1235 EXPORT_SYMBOL(ssb_bus_powerup);
1236
1237 u32 ssb_admatch_base(u32 adm)
1238 {
1239         u32 base = 0;
1240
1241         switch (adm & SSB_ADM_TYPE) {
1242         case SSB_ADM_TYPE0:
1243                 base = (adm & SSB_ADM_BASE0);
1244                 break;
1245         case SSB_ADM_TYPE1:
1246                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1247                 base = (adm & SSB_ADM_BASE1);
1248                 break;
1249         case SSB_ADM_TYPE2:
1250                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1251                 base = (adm & SSB_ADM_BASE2);
1252                 break;
1253         default:
1254                 SSB_WARN_ON(1);
1255         }
1256
1257         return base;
1258 }
1259 EXPORT_SYMBOL(ssb_admatch_base);
1260
1261 u32 ssb_admatch_size(u32 adm)
1262 {
1263         u32 size = 0;
1264
1265         switch (adm & SSB_ADM_TYPE) {
1266         case SSB_ADM_TYPE0:
1267                 size = ((adm & SSB_ADM_SZ0) >> SSB_ADM_SZ0_SHIFT);
1268                 break;
1269         case SSB_ADM_TYPE1:
1270                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1271                 size = ((adm & SSB_ADM_SZ1) >> SSB_ADM_SZ1_SHIFT);
1272                 break;
1273         case SSB_ADM_TYPE2:
1274                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1275                 size = ((adm & SSB_ADM_SZ2) >> SSB_ADM_SZ2_SHIFT);
1276                 break;
1277         default:
1278                 SSB_WARN_ON(1);
1279         }
1280         size = (1 << (size + 1));
1281
1282         return size;
1283 }
1284 EXPORT_SYMBOL(ssb_admatch_size);
1285
1286 static int __init ssb_modinit(void)
1287 {
1288         int err;
1289
1290         /* See the comment at the ssb_is_early_boot definition */
1291         ssb_is_early_boot = 0;
1292         err = bus_register(&ssb_bustype);
1293         if (err)
1294                 return err;
1295
1296         /* Maybe we already registered some buses at early boot.
1297          * Check for this and attach them
1298          */
1299         ssb_buses_lock();
1300         err = ssb_attach_queued_buses();
1301         ssb_buses_unlock();
1302         if (err)
1303                 bus_unregister(&ssb_bustype);
1304
1305         err = b43_pci_ssb_bridge_init();
1306         if (err) {
1307                 ssb_printk(KERN_ERR "Broadcom 43xx PCI-SSB-bridge "
1308                            "initialization failed\n");
1309                 /* don't fail SSB init because of this */
1310                 err = 0;
1311         }
1312         err = ssb_gige_init();
1313         if (err) {
1314                 ssb_printk(KERN_ERR "SSB Broadcom Gigabit Ethernet "
1315                            "driver initialization failed\n");
1316                 /* don't fail SSB init because of this */
1317                 err = 0;
1318         }
1319
1320         return err;
1321 }
1322 /* ssb must be initialized after PCI but before the ssb drivers.
1323  * That means we must use some initcall between subsys_initcall
1324  * and device_initcall. */
1325 fs_initcall(ssb_modinit);
1326
1327 static void __exit ssb_modexit(void)
1328 {
1329         ssb_gige_exit();
1330         b43_pci_ssb_bridge_exit();
1331         bus_unregister(&ssb_bustype);
1332 }
1333 module_exit(ssb_modexit)