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[mirror_ubuntu-jammy-kernel.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 <m@bues.ch>
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/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/ssb/ssb.h>
18 #include <linux/ssb/ssb_regs.h>
19 #include <linux/ssb/ssb_driver_gige.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/pci.h>
22 #include <linux/mmc/sdio_func.h>
23 #include <linux/slab.h>
24
25 #include <pcmcia/cistpl.h>
26 #include <pcmcia/ds.h>
27
28
29 MODULE_DESCRIPTION("Sonics Silicon Backplane driver");
30 MODULE_LICENSE("GPL");
31
32
33 /* Temporary list of yet-to-be-attached buses */
34 static LIST_HEAD(attach_queue);
35 /* List if running buses */
36 static LIST_HEAD(buses);
37 /* Software ID counter */
38 static unsigned int next_busnumber;
39 /* buses_mutes locks the two buslists and the next_busnumber.
40 * Don't lock this directly, but use ssb_buses_[un]lock() below.
41 */
42 static DEFINE_MUTEX(buses_mutex);
43
44 /* There are differences in the codeflow, if the bus is
45 * initialized from early boot, as various needed services
46 * are not available early. This is a mechanism to delay
47 * these initializations to after early boot has finished.
48 * It's also used to avoid mutex locking, as that's not
49 * available and needed early.
50 */
51 static bool ssb_is_early_boot = 1;
52
53 static void ssb_buses_lock(void);
54 static void ssb_buses_unlock(void);
55
56
57 #ifdef CONFIG_SSB_PCIHOST
58 struct ssb_bus *ssb_pci_dev_to_bus(struct pci_dev *pdev)
59 {
60 struct ssb_bus *bus;
61
62 ssb_buses_lock();
63 list_for_each_entry(bus, &buses, list) {
64 if (bus->bustype == SSB_BUSTYPE_PCI &&
65 bus->host_pci == pdev)
66 goto found;
67 }
68 bus = NULL;
69 found:
70 ssb_buses_unlock();
71
72 return bus;
73 }
74 #endif /* CONFIG_SSB_PCIHOST */
75
76 #ifdef CONFIG_SSB_PCMCIAHOST
77 struct ssb_bus *ssb_pcmcia_dev_to_bus(struct pcmcia_device *pdev)
78 {
79 struct ssb_bus *bus;
80
81 ssb_buses_lock();
82 list_for_each_entry(bus, &buses, list) {
83 if (bus->bustype == SSB_BUSTYPE_PCMCIA &&
84 bus->host_pcmcia == pdev)
85 goto found;
86 }
87 bus = NULL;
88 found:
89 ssb_buses_unlock();
90
91 return bus;
92 }
93 #endif /* CONFIG_SSB_PCMCIAHOST */
94
95 int ssb_for_each_bus_call(unsigned long data,
96 int (*func)(struct ssb_bus *bus, unsigned long data))
97 {
98 struct ssb_bus *bus;
99 int res;
100
101 ssb_buses_lock();
102 list_for_each_entry(bus, &buses, list) {
103 res = func(bus, data);
104 if (res >= 0) {
105 ssb_buses_unlock();
106 return res;
107 }
108 }
109 ssb_buses_unlock();
110
111 return -ENODEV;
112 }
113
114 static struct ssb_device *ssb_device_get(struct ssb_device *dev)
115 {
116 if (dev)
117 get_device(dev->dev);
118 return dev;
119 }
120
121 static void ssb_device_put(struct ssb_device *dev)
122 {
123 if (dev)
124 put_device(dev->dev);
125 }
126
127 static int ssb_device_resume(struct device *dev)
128 {
129 struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
130 struct ssb_driver *ssb_drv;
131 int err = 0;
132
133 if (dev->driver) {
134 ssb_drv = drv_to_ssb_drv(dev->driver);
135 if (ssb_drv && ssb_drv->resume)
136 err = ssb_drv->resume(ssb_dev);
137 if (err)
138 goto out;
139 }
140 out:
141 return err;
142 }
143
144 static int ssb_device_suspend(struct device *dev, pm_message_t state)
145 {
146 struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
147 struct ssb_driver *ssb_drv;
148 int err = 0;
149
150 if (dev->driver) {
151 ssb_drv = drv_to_ssb_drv(dev->driver);
152 if (ssb_drv && ssb_drv->suspend)
153 err = ssb_drv->suspend(ssb_dev, state);
154 if (err)
155 goto out;
156 }
157 out:
158 return err;
159 }
160
161 int ssb_bus_resume(struct ssb_bus *bus)
162 {
163 int err;
164
165 /* Reset HW state information in memory, so that HW is
166 * completely reinitialized.
167 */
168 bus->mapped_device = NULL;
169 #ifdef CONFIG_SSB_DRIVER_PCICORE
170 bus->pcicore.setup_done = 0;
171 #endif
172
173 err = ssb_bus_powerup(bus, 0);
174 if (err)
175 return err;
176 err = ssb_pcmcia_hardware_setup(bus);
177 if (err) {
178 ssb_bus_may_powerdown(bus);
179 return err;
180 }
181 ssb_chipco_resume(&bus->chipco);
182 ssb_bus_may_powerdown(bus);
183
184 return 0;
185 }
186 EXPORT_SYMBOL(ssb_bus_resume);
187
188 int ssb_bus_suspend(struct ssb_bus *bus)
189 {
190 ssb_chipco_suspend(&bus->chipco);
191 ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
192
193 return 0;
194 }
195 EXPORT_SYMBOL(ssb_bus_suspend);
196
197 #ifdef CONFIG_SSB_SPROM
198 /** ssb_devices_freeze - Freeze all devices on the bus.
199 *
200 * After freezing no device driver will be handling a device
201 * on this bus anymore. ssb_devices_thaw() must be called after
202 * a successful freeze to reactivate the devices.
203 *
204 * @bus: The bus.
205 * @ctx: Context structure. Pass this to ssb_devices_thaw().
206 */
207 int ssb_devices_freeze(struct ssb_bus *bus, struct ssb_freeze_context *ctx)
208 {
209 struct ssb_device *sdev;
210 struct ssb_driver *sdrv;
211 unsigned int i;
212
213 memset(ctx, 0, sizeof(*ctx));
214 ctx->bus = bus;
215 WARN_ON(bus->nr_devices > ARRAY_SIZE(ctx->device_frozen));
216
217 for (i = 0; i < bus->nr_devices; i++) {
218 sdev = ssb_device_get(&bus->devices[i]);
219
220 if (!sdev->dev || !sdev->dev->driver ||
221 !device_is_registered(sdev->dev)) {
222 ssb_device_put(sdev);
223 continue;
224 }
225 sdrv = drv_to_ssb_drv(sdev->dev->driver);
226 if (WARN_ON(!sdrv->remove))
227 continue;
228 sdrv->remove(sdev);
229 ctx->device_frozen[i] = 1;
230 }
231
232 return 0;
233 }
234
235 /** ssb_devices_thaw - Unfreeze all devices on the bus.
236 *
237 * This will re-attach the device drivers and re-init the devices.
238 *
239 * @ctx: The context structure from ssb_devices_freeze()
240 */
241 int ssb_devices_thaw(struct ssb_freeze_context *ctx)
242 {
243 struct ssb_bus *bus = ctx->bus;
244 struct ssb_device *sdev;
245 struct ssb_driver *sdrv;
246 unsigned int i;
247 int err, result = 0;
248
249 for (i = 0; i < bus->nr_devices; i++) {
250 if (!ctx->device_frozen[i])
251 continue;
252 sdev = &bus->devices[i];
253
254 if (WARN_ON(!sdev->dev || !sdev->dev->driver))
255 continue;
256 sdrv = drv_to_ssb_drv(sdev->dev->driver);
257 if (WARN_ON(!sdrv || !sdrv->probe))
258 continue;
259
260 err = sdrv->probe(sdev, &sdev->id);
261 if (err) {
262 dev_err(sdev->dev,
263 "Failed to thaw device %s\n",
264 dev_name(sdev->dev));
265 result = err;
266 }
267 ssb_device_put(sdev);
268 }
269
270 return result;
271 }
272 #endif /* CONFIG_SSB_SPROM */
273
274 static void ssb_device_shutdown(struct device *dev)
275 {
276 struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
277 struct ssb_driver *ssb_drv;
278
279 if (!dev->driver)
280 return;
281 ssb_drv = drv_to_ssb_drv(dev->driver);
282 if (ssb_drv && ssb_drv->shutdown)
283 ssb_drv->shutdown(ssb_dev);
284 }
285
286 static int ssb_device_remove(struct device *dev)
287 {
288 struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
289 struct ssb_driver *ssb_drv = drv_to_ssb_drv(dev->driver);
290
291 if (ssb_drv && ssb_drv->remove)
292 ssb_drv->remove(ssb_dev);
293 ssb_device_put(ssb_dev);
294
295 return 0;
296 }
297
298 static int ssb_device_probe(struct device *dev)
299 {
300 struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
301 struct ssb_driver *ssb_drv = drv_to_ssb_drv(dev->driver);
302 int err = 0;
303
304 ssb_device_get(ssb_dev);
305 if (ssb_drv && ssb_drv->probe)
306 err = ssb_drv->probe(ssb_dev, &ssb_dev->id);
307 if (err)
308 ssb_device_put(ssb_dev);
309
310 return err;
311 }
312
313 static int ssb_match_devid(const struct ssb_device_id *tabid,
314 const struct ssb_device_id *devid)
315 {
316 if ((tabid->vendor != devid->vendor) &&
317 tabid->vendor != SSB_ANY_VENDOR)
318 return 0;
319 if ((tabid->coreid != devid->coreid) &&
320 tabid->coreid != SSB_ANY_ID)
321 return 0;
322 if ((tabid->revision != devid->revision) &&
323 tabid->revision != SSB_ANY_REV)
324 return 0;
325 return 1;
326 }
327
328 static int ssb_bus_match(struct device *dev, struct device_driver *drv)
329 {
330 struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
331 struct ssb_driver *ssb_drv = drv_to_ssb_drv(drv);
332 const struct ssb_device_id *id;
333
334 for (id = ssb_drv->id_table;
335 id->vendor || id->coreid || id->revision;
336 id++) {
337 if (ssb_match_devid(id, &ssb_dev->id))
338 return 1; /* found */
339 }
340
341 return 0;
342 }
343
344 static int ssb_device_uevent(struct device *dev, struct kobj_uevent_env *env)
345 {
346 struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
347
348 if (!dev)
349 return -ENODEV;
350
351 return add_uevent_var(env,
352 "MODALIAS=ssb:v%04Xid%04Xrev%02X",
353 ssb_dev->id.vendor, ssb_dev->id.coreid,
354 ssb_dev->id.revision);
355 }
356
357 #define ssb_config_attr(attrib, field, format_string) \
358 static ssize_t \
359 attrib##_show(struct device *dev, struct device_attribute *attr, char *buf) \
360 { \
361 return sprintf(buf, format_string, dev_to_ssb_dev(dev)->field); \
362 } \
363 static DEVICE_ATTR_RO(attrib);
364
365 ssb_config_attr(core_num, core_index, "%u\n")
366 ssb_config_attr(coreid, id.coreid, "0x%04x\n")
367 ssb_config_attr(vendor, id.vendor, "0x%04x\n")
368 ssb_config_attr(revision, id.revision, "%u\n")
369 ssb_config_attr(irq, irq, "%u\n")
370 static ssize_t
371 name_show(struct device *dev, struct device_attribute *attr, char *buf)
372 {
373 return sprintf(buf, "%s\n",
374 ssb_core_name(dev_to_ssb_dev(dev)->id.coreid));
375 }
376 static DEVICE_ATTR_RO(name);
377
378 static struct attribute *ssb_device_attrs[] = {
379 &dev_attr_name.attr,
380 &dev_attr_core_num.attr,
381 &dev_attr_coreid.attr,
382 &dev_attr_vendor.attr,
383 &dev_attr_revision.attr,
384 &dev_attr_irq.attr,
385 NULL,
386 };
387 ATTRIBUTE_GROUPS(ssb_device);
388
389 static struct bus_type ssb_bustype = {
390 .name = "ssb",
391 .match = ssb_bus_match,
392 .probe = ssb_device_probe,
393 .remove = ssb_device_remove,
394 .shutdown = ssb_device_shutdown,
395 .suspend = ssb_device_suspend,
396 .resume = ssb_device_resume,
397 .uevent = ssb_device_uevent,
398 .dev_groups = ssb_device_groups,
399 };
400
401 static void ssb_buses_lock(void)
402 {
403 /* See the comment at the ssb_is_early_boot definition */
404 if (!ssb_is_early_boot)
405 mutex_lock(&buses_mutex);
406 }
407
408 static void ssb_buses_unlock(void)
409 {
410 /* See the comment at the ssb_is_early_boot definition */
411 if (!ssb_is_early_boot)
412 mutex_unlock(&buses_mutex);
413 }
414
415 static void ssb_devices_unregister(struct ssb_bus *bus)
416 {
417 struct ssb_device *sdev;
418 int i;
419
420 for (i = bus->nr_devices - 1; i >= 0; i--) {
421 sdev = &(bus->devices[i]);
422 if (sdev->dev)
423 device_unregister(sdev->dev);
424 }
425
426 #ifdef CONFIG_SSB_EMBEDDED
427 if (bus->bustype == SSB_BUSTYPE_SSB)
428 platform_device_unregister(bus->watchdog);
429 #endif
430 }
431
432 void ssb_bus_unregister(struct ssb_bus *bus)
433 {
434 int err;
435
436 err = ssb_gpio_unregister(bus);
437 if (err)
438 pr_debug("Can not unregister GPIO driver: %i\n", err);
439
440 ssb_buses_lock();
441 ssb_devices_unregister(bus);
442 list_del(&bus->list);
443 ssb_buses_unlock();
444
445 ssb_pcmcia_exit(bus);
446 ssb_pci_exit(bus);
447 ssb_iounmap(bus);
448 }
449 EXPORT_SYMBOL(ssb_bus_unregister);
450
451 static void ssb_release_dev(struct device *dev)
452 {
453 struct __ssb_dev_wrapper *devwrap;
454
455 devwrap = container_of(dev, struct __ssb_dev_wrapper, dev);
456 kfree(devwrap);
457 }
458
459 static int ssb_devices_register(struct ssb_bus *bus)
460 {
461 struct ssb_device *sdev;
462 struct device *dev;
463 struct __ssb_dev_wrapper *devwrap;
464 int i, err = 0;
465 int dev_idx = 0;
466
467 for (i = 0; i < bus->nr_devices; i++) {
468 sdev = &(bus->devices[i]);
469
470 /* We don't register SSB-system devices to the kernel,
471 * as the drivers for them are built into SSB.
472 */
473 switch (sdev->id.coreid) {
474 case SSB_DEV_CHIPCOMMON:
475 case SSB_DEV_PCI:
476 case SSB_DEV_PCIE:
477 case SSB_DEV_PCMCIA:
478 case SSB_DEV_MIPS:
479 case SSB_DEV_MIPS_3302:
480 case SSB_DEV_EXTIF:
481 continue;
482 }
483
484 devwrap = kzalloc(sizeof(*devwrap), GFP_KERNEL);
485 if (!devwrap) {
486 err = -ENOMEM;
487 goto error;
488 }
489 dev = &devwrap->dev;
490 devwrap->sdev = sdev;
491
492 dev->release = ssb_release_dev;
493 dev->bus = &ssb_bustype;
494 dev_set_name(dev, "ssb%u:%d", bus->busnumber, dev_idx);
495
496 switch (bus->bustype) {
497 case SSB_BUSTYPE_PCI:
498 #ifdef CONFIG_SSB_PCIHOST
499 sdev->irq = bus->host_pci->irq;
500 dev->parent = &bus->host_pci->dev;
501 sdev->dma_dev = dev->parent;
502 #endif
503 break;
504 case SSB_BUSTYPE_PCMCIA:
505 #ifdef CONFIG_SSB_PCMCIAHOST
506 sdev->irq = bus->host_pcmcia->irq;
507 dev->parent = &bus->host_pcmcia->dev;
508 #endif
509 break;
510 case SSB_BUSTYPE_SDIO:
511 #ifdef CONFIG_SSB_SDIOHOST
512 dev->parent = &bus->host_sdio->dev;
513 #endif
514 break;
515 case SSB_BUSTYPE_SSB:
516 dev->dma_mask = &dev->coherent_dma_mask;
517 sdev->dma_dev = dev;
518 break;
519 }
520
521 sdev->dev = dev;
522 err = device_register(dev);
523 if (err) {
524 pr_err("Could not register %s\n", dev_name(dev));
525 /* Set dev to NULL to not unregister
526 * dev on error unwinding.
527 */
528 sdev->dev = NULL;
529 put_device(dev);
530 goto error;
531 }
532 dev_idx++;
533 }
534
535 #ifdef CONFIG_SSB_DRIVER_MIPS
536 if (bus->mipscore.pflash.present) {
537 err = platform_device_register(&ssb_pflash_dev);
538 if (err)
539 pr_err("Error registering parallel flash\n");
540 }
541 #endif
542
543 #ifdef CONFIG_SSB_SFLASH
544 if (bus->mipscore.sflash.present) {
545 err = platform_device_register(&ssb_sflash_dev);
546 if (err)
547 pr_err("Error registering serial flash\n");
548 }
549 #endif
550
551 return 0;
552 error:
553 /* Unwind the already registered devices. */
554 ssb_devices_unregister(bus);
555 return err;
556 }
557
558 /* Needs ssb_buses_lock() */
559 static int ssb_attach_queued_buses(void)
560 {
561 struct ssb_bus *bus, *n;
562 int err = 0;
563 int drop_them_all = 0;
564
565 list_for_each_entry_safe(bus, n, &attach_queue, list) {
566 if (drop_them_all) {
567 list_del(&bus->list);
568 continue;
569 }
570 /* Can't init the PCIcore in ssb_bus_register(), as that
571 * is too early in boot for embedded systems
572 * (no udelay() available). So do it here in attach stage.
573 */
574 err = ssb_bus_powerup(bus, 0);
575 if (err)
576 goto error;
577 ssb_pcicore_init(&bus->pcicore);
578 if (bus->bustype == SSB_BUSTYPE_SSB)
579 ssb_watchdog_register(bus);
580
581 err = ssb_gpio_init(bus);
582 if (err == -ENOTSUPP)
583 pr_debug("GPIO driver not activated\n");
584 else if (err)
585 pr_debug("Error registering GPIO driver: %i\n", err);
586
587 ssb_bus_may_powerdown(bus);
588
589 err = ssb_devices_register(bus);
590 error:
591 if (err) {
592 drop_them_all = 1;
593 list_del(&bus->list);
594 continue;
595 }
596 list_move_tail(&bus->list, &buses);
597 }
598
599 return err;
600 }
601
602 static int ssb_fetch_invariants(struct ssb_bus *bus,
603 ssb_invariants_func_t get_invariants)
604 {
605 struct ssb_init_invariants iv;
606 int err;
607
608 memset(&iv, 0, sizeof(iv));
609 err = get_invariants(bus, &iv);
610 if (err)
611 goto out;
612 memcpy(&bus->boardinfo, &iv.boardinfo, sizeof(iv.boardinfo));
613 memcpy(&bus->sprom, &iv.sprom, sizeof(iv.sprom));
614 bus->has_cardbus_slot = iv.has_cardbus_slot;
615 out:
616 return err;
617 }
618
619 static int __maybe_unused
620 ssb_bus_register(struct ssb_bus *bus,
621 ssb_invariants_func_t get_invariants,
622 unsigned long baseaddr)
623 {
624 int err;
625
626 spin_lock_init(&bus->bar_lock);
627 INIT_LIST_HEAD(&bus->list);
628 #ifdef CONFIG_SSB_EMBEDDED
629 spin_lock_init(&bus->gpio_lock);
630 #endif
631
632 /* Powerup the bus */
633 err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
634 if (err)
635 goto out;
636
637 /* Init SDIO-host device (if any), before the scan */
638 err = ssb_sdio_init(bus);
639 if (err)
640 goto err_disable_xtal;
641
642 ssb_buses_lock();
643 bus->busnumber = next_busnumber;
644 /* Scan for devices (cores) */
645 err = ssb_bus_scan(bus, baseaddr);
646 if (err)
647 goto err_sdio_exit;
648
649 /* Init PCI-host device (if any) */
650 err = ssb_pci_init(bus);
651 if (err)
652 goto err_unmap;
653 /* Init PCMCIA-host device (if any) */
654 err = ssb_pcmcia_init(bus);
655 if (err)
656 goto err_pci_exit;
657
658 /* Initialize basic system devices (if available) */
659 err = ssb_bus_powerup(bus, 0);
660 if (err)
661 goto err_pcmcia_exit;
662 ssb_chipcommon_init(&bus->chipco);
663 ssb_extif_init(&bus->extif);
664 ssb_mipscore_init(&bus->mipscore);
665 err = ssb_fetch_invariants(bus, get_invariants);
666 if (err) {
667 ssb_bus_may_powerdown(bus);
668 goto err_pcmcia_exit;
669 }
670 ssb_bus_may_powerdown(bus);
671
672 /* Queue it for attach.
673 * See the comment at the ssb_is_early_boot definition.
674 */
675 list_add_tail(&bus->list, &attach_queue);
676 if (!ssb_is_early_boot) {
677 /* This is not early boot, so we must attach the bus now */
678 err = ssb_attach_queued_buses();
679 if (err)
680 goto err_dequeue;
681 }
682 next_busnumber++;
683 ssb_buses_unlock();
684
685 out:
686 return err;
687
688 err_dequeue:
689 list_del(&bus->list);
690 err_pcmcia_exit:
691 ssb_pcmcia_exit(bus);
692 err_pci_exit:
693 ssb_pci_exit(bus);
694 err_unmap:
695 ssb_iounmap(bus);
696 err_sdio_exit:
697 ssb_sdio_exit(bus);
698 err_disable_xtal:
699 ssb_buses_unlock();
700 ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
701 return err;
702 }
703
704 #ifdef CONFIG_SSB_PCIHOST
705 int ssb_bus_pcibus_register(struct ssb_bus *bus, struct pci_dev *host_pci)
706 {
707 int err;
708
709 bus->bustype = SSB_BUSTYPE_PCI;
710 bus->host_pci = host_pci;
711 bus->ops = &ssb_pci_ops;
712
713 err = ssb_bus_register(bus, ssb_pci_get_invariants, 0);
714 if (!err) {
715 dev_info(&host_pci->dev,
716 "Sonics Silicon Backplane found on PCI device %s\n",
717 dev_name(&host_pci->dev));
718 } else {
719 dev_err(&host_pci->dev,
720 "Failed to register PCI version of SSB with error %d\n",
721 err);
722 }
723
724 return err;
725 }
726 #endif /* CONFIG_SSB_PCIHOST */
727
728 #ifdef CONFIG_SSB_PCMCIAHOST
729 int ssb_bus_pcmciabus_register(struct ssb_bus *bus,
730 struct pcmcia_device *pcmcia_dev,
731 unsigned long baseaddr)
732 {
733 int err;
734
735 bus->bustype = SSB_BUSTYPE_PCMCIA;
736 bus->host_pcmcia = pcmcia_dev;
737 bus->ops = &ssb_pcmcia_ops;
738
739 err = ssb_bus_register(bus, ssb_pcmcia_get_invariants, baseaddr);
740 if (!err) {
741 dev_info(&pcmcia_dev->dev,
742 "Sonics Silicon Backplane found on PCMCIA device %s\n",
743 pcmcia_dev->devname);
744 }
745
746 return err;
747 }
748 #endif /* CONFIG_SSB_PCMCIAHOST */
749
750 #ifdef CONFIG_SSB_SDIOHOST
751 int ssb_bus_sdiobus_register(struct ssb_bus *bus, struct sdio_func *func,
752 unsigned int quirks)
753 {
754 int err;
755
756 bus->bustype = SSB_BUSTYPE_SDIO;
757 bus->host_sdio = func;
758 bus->ops = &ssb_sdio_ops;
759 bus->quirks = quirks;
760
761 err = ssb_bus_register(bus, ssb_sdio_get_invariants, ~0);
762 if (!err) {
763 dev_info(&func->dev,
764 "Sonics Silicon Backplane found on SDIO device %s\n",
765 sdio_func_id(func));
766 }
767
768 return err;
769 }
770 EXPORT_SYMBOL(ssb_bus_sdiobus_register);
771 #endif /* CONFIG_SSB_PCMCIAHOST */
772
773 #ifdef CONFIG_SSB_HOST_SOC
774 int ssb_bus_host_soc_register(struct ssb_bus *bus, unsigned long baseaddr)
775 {
776 int err;
777
778 bus->bustype = SSB_BUSTYPE_SSB;
779 bus->ops = &ssb_host_soc_ops;
780
781 err = ssb_bus_register(bus, ssb_host_soc_get_invariants, baseaddr);
782 if (!err) {
783 pr_info("Sonics Silicon Backplane found at address 0x%08lX\n",
784 baseaddr);
785 }
786
787 return err;
788 }
789 #endif
790
791 int __ssb_driver_register(struct ssb_driver *drv, struct module *owner)
792 {
793 drv->drv.name = drv->name;
794 drv->drv.bus = &ssb_bustype;
795 drv->drv.owner = owner;
796
797 return driver_register(&drv->drv);
798 }
799 EXPORT_SYMBOL(__ssb_driver_register);
800
801 void ssb_driver_unregister(struct ssb_driver *drv)
802 {
803 driver_unregister(&drv->drv);
804 }
805 EXPORT_SYMBOL(ssb_driver_unregister);
806
807 void ssb_set_devtypedata(struct ssb_device *dev, void *data)
808 {
809 struct ssb_bus *bus = dev->bus;
810 struct ssb_device *ent;
811 int i;
812
813 for (i = 0; i < bus->nr_devices; i++) {
814 ent = &(bus->devices[i]);
815 if (ent->id.vendor != dev->id.vendor)
816 continue;
817 if (ent->id.coreid != dev->id.coreid)
818 continue;
819
820 ent->devtypedata = data;
821 }
822 }
823 EXPORT_SYMBOL(ssb_set_devtypedata);
824
825 static u32 clkfactor_f6_resolve(u32 v)
826 {
827 /* map the magic values */
828 switch (v) {
829 case SSB_CHIPCO_CLK_F6_2:
830 return 2;
831 case SSB_CHIPCO_CLK_F6_3:
832 return 3;
833 case SSB_CHIPCO_CLK_F6_4:
834 return 4;
835 case SSB_CHIPCO_CLK_F6_5:
836 return 5;
837 case SSB_CHIPCO_CLK_F6_6:
838 return 6;
839 case SSB_CHIPCO_CLK_F6_7:
840 return 7;
841 }
842 return 0;
843 }
844
845 /* Calculate the speed the backplane would run at a given set of clockcontrol values */
846 u32 ssb_calc_clock_rate(u32 plltype, u32 n, u32 m)
847 {
848 u32 n1, n2, clock, m1, m2, m3, mc;
849
850 n1 = (n & SSB_CHIPCO_CLK_N1);
851 n2 = ((n & SSB_CHIPCO_CLK_N2) >> SSB_CHIPCO_CLK_N2_SHIFT);
852
853 switch (plltype) {
854 case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
855 if (m & SSB_CHIPCO_CLK_T6_MMASK)
856 return SSB_CHIPCO_CLK_T6_M1;
857 return SSB_CHIPCO_CLK_T6_M0;
858 case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
859 case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
860 case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
861 case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
862 n1 = clkfactor_f6_resolve(n1);
863 n2 += SSB_CHIPCO_CLK_F5_BIAS;
864 break;
865 case SSB_PLLTYPE_2: /* 48Mhz, 4 dividers */
866 n1 += SSB_CHIPCO_CLK_T2_BIAS;
867 n2 += SSB_CHIPCO_CLK_T2_BIAS;
868 WARN_ON(!((n1 >= 2) && (n1 <= 7)));
869 WARN_ON(!((n2 >= 5) && (n2 <= 23)));
870 break;
871 case SSB_PLLTYPE_5: /* 25Mhz, 4 dividers */
872 return 100000000;
873 default:
874 WARN_ON(1);
875 }
876
877 switch (plltype) {
878 case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
879 case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
880 clock = SSB_CHIPCO_CLK_BASE2 * n1 * n2;
881 break;
882 default:
883 clock = SSB_CHIPCO_CLK_BASE1 * n1 * n2;
884 }
885 if (!clock)
886 return 0;
887
888 m1 = (m & SSB_CHIPCO_CLK_M1);
889 m2 = ((m & SSB_CHIPCO_CLK_M2) >> SSB_CHIPCO_CLK_M2_SHIFT);
890 m3 = ((m & SSB_CHIPCO_CLK_M3) >> SSB_CHIPCO_CLK_M3_SHIFT);
891 mc = ((m & SSB_CHIPCO_CLK_MC) >> SSB_CHIPCO_CLK_MC_SHIFT);
892
893 switch (plltype) {
894 case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
895 case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
896 case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
897 case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
898 m1 = clkfactor_f6_resolve(m1);
899 if ((plltype == SSB_PLLTYPE_1) ||
900 (plltype == SSB_PLLTYPE_3))
901 m2 += SSB_CHIPCO_CLK_F5_BIAS;
902 else
903 m2 = clkfactor_f6_resolve(m2);
904 m3 = clkfactor_f6_resolve(m3);
905
906 switch (mc) {
907 case SSB_CHIPCO_CLK_MC_BYPASS:
908 return clock;
909 case SSB_CHIPCO_CLK_MC_M1:
910 return (clock / m1);
911 case SSB_CHIPCO_CLK_MC_M1M2:
912 return (clock / (m1 * m2));
913 case SSB_CHIPCO_CLK_MC_M1M2M3:
914 return (clock / (m1 * m2 * m3));
915 case SSB_CHIPCO_CLK_MC_M1M3:
916 return (clock / (m1 * m3));
917 }
918 return 0;
919 case SSB_PLLTYPE_2:
920 m1 += SSB_CHIPCO_CLK_T2_BIAS;
921 m2 += SSB_CHIPCO_CLK_T2M2_BIAS;
922 m3 += SSB_CHIPCO_CLK_T2_BIAS;
923 WARN_ON(!((m1 >= 2) && (m1 <= 7)));
924 WARN_ON(!((m2 >= 3) && (m2 <= 10)));
925 WARN_ON(!((m3 >= 2) && (m3 <= 7)));
926
927 if (!(mc & SSB_CHIPCO_CLK_T2MC_M1BYP))
928 clock /= m1;
929 if (!(mc & SSB_CHIPCO_CLK_T2MC_M2BYP))
930 clock /= m2;
931 if (!(mc & SSB_CHIPCO_CLK_T2MC_M3BYP))
932 clock /= m3;
933 return clock;
934 default:
935 WARN_ON(1);
936 }
937 return 0;
938 }
939
940 /* Get the current speed the backplane is running at */
941 u32 ssb_clockspeed(struct ssb_bus *bus)
942 {
943 u32 rate;
944 u32 plltype;
945 u32 clkctl_n, clkctl_m;
946
947 if (bus->chipco.capabilities & SSB_CHIPCO_CAP_PMU)
948 return ssb_pmu_get_controlclock(&bus->chipco);
949
950 if (ssb_extif_available(&bus->extif))
951 ssb_extif_get_clockcontrol(&bus->extif, &plltype,
952 &clkctl_n, &clkctl_m);
953 else if (bus->chipco.dev)
954 ssb_chipco_get_clockcontrol(&bus->chipco, &plltype,
955 &clkctl_n, &clkctl_m);
956 else
957 return 0;
958
959 if (bus->chip_id == 0x5365) {
960 rate = 100000000;
961 } else {
962 rate = ssb_calc_clock_rate(plltype, clkctl_n, clkctl_m);
963 if (plltype == SSB_PLLTYPE_3) /* 25Mhz, 2 dividers */
964 rate /= 2;
965 }
966
967 return rate;
968 }
969 EXPORT_SYMBOL(ssb_clockspeed);
970
971 static u32 ssb_tmslow_reject_bitmask(struct ssb_device *dev)
972 {
973 u32 rev = ssb_read32(dev, SSB_IDLOW) & SSB_IDLOW_SSBREV;
974
975 /* The REJECT bit seems to be different for Backplane rev 2.3 */
976 switch (rev) {
977 case SSB_IDLOW_SSBREV_22:
978 case SSB_IDLOW_SSBREV_24:
979 case SSB_IDLOW_SSBREV_26:
980 return SSB_TMSLOW_REJECT;
981 case SSB_IDLOW_SSBREV_23:
982 return SSB_TMSLOW_REJECT_23;
983 case SSB_IDLOW_SSBREV_25: /* TODO - find the proper REJECT bit */
984 case SSB_IDLOW_SSBREV_27: /* same here */
985 return SSB_TMSLOW_REJECT; /* this is a guess */
986 case SSB_IDLOW_SSBREV:
987 break;
988 default:
989 WARN(1, KERN_INFO "ssb: Backplane Revision 0x%.8X\n", rev);
990 }
991 return (SSB_TMSLOW_REJECT | SSB_TMSLOW_REJECT_23);
992 }
993
994 int ssb_device_is_enabled(struct ssb_device *dev)
995 {
996 u32 val;
997 u32 reject;
998
999 reject = ssb_tmslow_reject_bitmask(dev);
1000 val = ssb_read32(dev, SSB_TMSLOW);
1001 val &= SSB_TMSLOW_CLOCK | SSB_TMSLOW_RESET | reject;
1002
1003 return (val == SSB_TMSLOW_CLOCK);
1004 }
1005 EXPORT_SYMBOL(ssb_device_is_enabled);
1006
1007 static void ssb_flush_tmslow(struct ssb_device *dev)
1008 {
1009 /* Make _really_ sure the device has finished the TMSLOW
1010 * register write transaction, as we risk running into
1011 * a machine check exception otherwise.
1012 * Do this by reading the register back to commit the
1013 * PCI write and delay an additional usec for the device
1014 * to react to the change.
1015 */
1016 ssb_read32(dev, SSB_TMSLOW);
1017 udelay(1);
1018 }
1019
1020 void ssb_device_enable(struct ssb_device *dev, u32 core_specific_flags)
1021 {
1022 u32 val;
1023
1024 ssb_device_disable(dev, core_specific_flags);
1025 ssb_write32(dev, SSB_TMSLOW,
1026 SSB_TMSLOW_RESET | SSB_TMSLOW_CLOCK |
1027 SSB_TMSLOW_FGC | core_specific_flags);
1028 ssb_flush_tmslow(dev);
1029
1030 /* Clear SERR if set. This is a hw bug workaround. */
1031 if (ssb_read32(dev, SSB_TMSHIGH) & SSB_TMSHIGH_SERR)
1032 ssb_write32(dev, SSB_TMSHIGH, 0);
1033
1034 val = ssb_read32(dev, SSB_IMSTATE);
1035 if (val & (SSB_IMSTATE_IBE | SSB_IMSTATE_TO)) {
1036 val &= ~(SSB_IMSTATE_IBE | SSB_IMSTATE_TO);
1037 ssb_write32(dev, SSB_IMSTATE, val);
1038 }
1039
1040 ssb_write32(dev, SSB_TMSLOW,
1041 SSB_TMSLOW_CLOCK | SSB_TMSLOW_FGC |
1042 core_specific_flags);
1043 ssb_flush_tmslow(dev);
1044
1045 ssb_write32(dev, SSB_TMSLOW, SSB_TMSLOW_CLOCK |
1046 core_specific_flags);
1047 ssb_flush_tmslow(dev);
1048 }
1049 EXPORT_SYMBOL(ssb_device_enable);
1050
1051 /* Wait for bitmask in a register to get set or cleared.
1052 * timeout is in units of ten-microseconds
1053 */
1054 static int ssb_wait_bits(struct ssb_device *dev, u16 reg, u32 bitmask,
1055 int timeout, int set)
1056 {
1057 int i;
1058 u32 val;
1059
1060 for (i = 0; i < timeout; i++) {
1061 val = ssb_read32(dev, reg);
1062 if (set) {
1063 if ((val & bitmask) == bitmask)
1064 return 0;
1065 } else {
1066 if (!(val & bitmask))
1067 return 0;
1068 }
1069 udelay(10);
1070 }
1071 dev_err(dev->dev,
1072 "Timeout waiting for bitmask %08X on register %04X to %s\n",
1073 bitmask, reg, set ? "set" : "clear");
1074
1075 return -ETIMEDOUT;
1076 }
1077
1078 void ssb_device_disable(struct ssb_device *dev, u32 core_specific_flags)
1079 {
1080 u32 reject, val;
1081
1082 if (ssb_read32(dev, SSB_TMSLOW) & SSB_TMSLOW_RESET)
1083 return;
1084
1085 reject = ssb_tmslow_reject_bitmask(dev);
1086
1087 if (ssb_read32(dev, SSB_TMSLOW) & SSB_TMSLOW_CLOCK) {
1088 ssb_write32(dev, SSB_TMSLOW, reject | SSB_TMSLOW_CLOCK);
1089 ssb_wait_bits(dev, SSB_TMSLOW, reject, 1000, 1);
1090 ssb_wait_bits(dev, SSB_TMSHIGH, SSB_TMSHIGH_BUSY, 1000, 0);
1091
1092 if (ssb_read32(dev, SSB_IDLOW) & SSB_IDLOW_INITIATOR) {
1093 val = ssb_read32(dev, SSB_IMSTATE);
1094 val |= SSB_IMSTATE_REJECT;
1095 ssb_write32(dev, SSB_IMSTATE, val);
1096 ssb_wait_bits(dev, SSB_IMSTATE, SSB_IMSTATE_BUSY, 1000,
1097 0);
1098 }
1099
1100 ssb_write32(dev, SSB_TMSLOW,
1101 SSB_TMSLOW_FGC | SSB_TMSLOW_CLOCK |
1102 reject | SSB_TMSLOW_RESET |
1103 core_specific_flags);
1104 ssb_flush_tmslow(dev);
1105
1106 if (ssb_read32(dev, SSB_IDLOW) & SSB_IDLOW_INITIATOR) {
1107 val = ssb_read32(dev, SSB_IMSTATE);
1108 val &= ~SSB_IMSTATE_REJECT;
1109 ssb_write32(dev, SSB_IMSTATE, val);
1110 }
1111 }
1112
1113 ssb_write32(dev, SSB_TMSLOW,
1114 reject | SSB_TMSLOW_RESET |
1115 core_specific_flags);
1116 ssb_flush_tmslow(dev);
1117 }
1118 EXPORT_SYMBOL(ssb_device_disable);
1119
1120 /* Some chipsets need routing known for PCIe and 64-bit DMA */
1121 static bool ssb_dma_translation_special_bit(struct ssb_device *dev)
1122 {
1123 u16 chip_id = dev->bus->chip_id;
1124
1125 if (dev->id.coreid == SSB_DEV_80211) {
1126 return (chip_id == 0x4322 || chip_id == 43221 ||
1127 chip_id == 43231 || chip_id == 43222);
1128 }
1129
1130 return false;
1131 }
1132
1133 u32 ssb_dma_translation(struct ssb_device *dev)
1134 {
1135 switch (dev->bus->bustype) {
1136 case SSB_BUSTYPE_SSB:
1137 return 0;
1138 case SSB_BUSTYPE_PCI:
1139 if (pci_is_pcie(dev->bus->host_pci) &&
1140 ssb_read32(dev, SSB_TMSHIGH) & SSB_TMSHIGH_DMA64) {
1141 return SSB_PCIE_DMA_H32;
1142 } else {
1143 if (ssb_dma_translation_special_bit(dev))
1144 return SSB_PCIE_DMA_H32;
1145 else
1146 return SSB_PCI_DMA;
1147 }
1148 default:
1149 __ssb_dma_not_implemented(dev);
1150 }
1151 return 0;
1152 }
1153 EXPORT_SYMBOL(ssb_dma_translation);
1154
1155 int ssb_bus_may_powerdown(struct ssb_bus *bus)
1156 {
1157 struct ssb_chipcommon *cc;
1158 int err = 0;
1159
1160 /* On buses where more than one core may be working
1161 * at a time, we must not powerdown stuff if there are
1162 * still cores that may want to run.
1163 */
1164 if (bus->bustype == SSB_BUSTYPE_SSB)
1165 goto out;
1166
1167 cc = &bus->chipco;
1168
1169 if (!cc->dev)
1170 goto out;
1171 if (cc->dev->id.revision < 5)
1172 goto out;
1173
1174 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
1175 err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
1176 if (err)
1177 goto error;
1178 out:
1179 bus->powered_up = 0;
1180 return err;
1181 error:
1182 pr_err("Bus powerdown failed\n");
1183 goto out;
1184 }
1185 EXPORT_SYMBOL(ssb_bus_may_powerdown);
1186
1187 int ssb_bus_powerup(struct ssb_bus *bus, bool dynamic_pctl)
1188 {
1189 int err;
1190 enum ssb_clkmode mode;
1191
1192 err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
1193 if (err)
1194 goto error;
1195
1196 bus->powered_up = 1;
1197
1198 mode = dynamic_pctl ? SSB_CLKMODE_DYNAMIC : SSB_CLKMODE_FAST;
1199 ssb_chipco_set_clockmode(&bus->chipco, mode);
1200
1201 return 0;
1202 error:
1203 pr_err("Bus powerup failed\n");
1204 return err;
1205 }
1206 EXPORT_SYMBOL(ssb_bus_powerup);
1207
1208 static void ssb_broadcast_value(struct ssb_device *dev,
1209 u32 address, u32 data)
1210 {
1211 #ifdef CONFIG_SSB_DRIVER_PCICORE
1212 /* This is used for both, PCI and ChipCommon core, so be careful. */
1213 BUILD_BUG_ON(SSB_PCICORE_BCAST_ADDR != SSB_CHIPCO_BCAST_ADDR);
1214 BUILD_BUG_ON(SSB_PCICORE_BCAST_DATA != SSB_CHIPCO_BCAST_DATA);
1215 #endif
1216
1217 ssb_write32(dev, SSB_CHIPCO_BCAST_ADDR, address);
1218 ssb_read32(dev, SSB_CHIPCO_BCAST_ADDR); /* flush */
1219 ssb_write32(dev, SSB_CHIPCO_BCAST_DATA, data);
1220 ssb_read32(dev, SSB_CHIPCO_BCAST_DATA); /* flush */
1221 }
1222
1223 void ssb_commit_settings(struct ssb_bus *bus)
1224 {
1225 struct ssb_device *dev;
1226
1227 #ifdef CONFIG_SSB_DRIVER_PCICORE
1228 dev = bus->chipco.dev ? bus->chipco.dev : bus->pcicore.dev;
1229 #else
1230 dev = bus->chipco.dev;
1231 #endif
1232 if (WARN_ON(!dev))
1233 return;
1234 /* This forces an update of the cached registers. */
1235 ssb_broadcast_value(dev, 0xFD8, 0);
1236 }
1237 EXPORT_SYMBOL(ssb_commit_settings);
1238
1239 u32 ssb_admatch_base(u32 adm)
1240 {
1241 u32 base = 0;
1242
1243 switch (adm & SSB_ADM_TYPE) {
1244 case SSB_ADM_TYPE0:
1245 base = (adm & SSB_ADM_BASE0);
1246 break;
1247 case SSB_ADM_TYPE1:
1248 WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1249 base = (adm & SSB_ADM_BASE1);
1250 break;
1251 case SSB_ADM_TYPE2:
1252 WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1253 base = (adm & SSB_ADM_BASE2);
1254 break;
1255 default:
1256 WARN_ON(1);
1257 }
1258
1259 return base;
1260 }
1261 EXPORT_SYMBOL(ssb_admatch_base);
1262
1263 u32 ssb_admatch_size(u32 adm)
1264 {
1265 u32 size = 0;
1266
1267 switch (adm & SSB_ADM_TYPE) {
1268 case SSB_ADM_TYPE0:
1269 size = ((adm & SSB_ADM_SZ0) >> SSB_ADM_SZ0_SHIFT);
1270 break;
1271 case SSB_ADM_TYPE1:
1272 WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1273 size = ((adm & SSB_ADM_SZ1) >> SSB_ADM_SZ1_SHIFT);
1274 break;
1275 case SSB_ADM_TYPE2:
1276 WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1277 size = ((adm & SSB_ADM_SZ2) >> SSB_ADM_SZ2_SHIFT);
1278 break;
1279 default:
1280 WARN_ON(1);
1281 }
1282 size = (1 << (size + 1));
1283
1284 return size;
1285 }
1286 EXPORT_SYMBOL(ssb_admatch_size);
1287
1288 static int __init ssb_modinit(void)
1289 {
1290 int err;
1291
1292 /* See the comment at the ssb_is_early_boot definition */
1293 ssb_is_early_boot = 0;
1294 err = bus_register(&ssb_bustype);
1295 if (err)
1296 return err;
1297
1298 /* Maybe we already registered some buses at early boot.
1299 * Check for this and attach them
1300 */
1301 ssb_buses_lock();
1302 err = ssb_attach_queued_buses();
1303 ssb_buses_unlock();
1304 if (err) {
1305 bus_unregister(&ssb_bustype);
1306 goto out;
1307 }
1308
1309 err = b43_pci_ssb_bridge_init();
1310 if (err) {
1311 pr_err("Broadcom 43xx PCI-SSB-bridge initialization failed\n");
1312 /* don't fail SSB init because of this */
1313 }
1314 err = ssb_host_pcmcia_init();
1315 if (err) {
1316 pr_err("PCMCIA host initialization failed\n");
1317 /* don't fail SSB init because of this */
1318 }
1319 err = ssb_gige_init();
1320 if (err) {
1321 pr_err("SSB Broadcom Gigabit Ethernet driver initialization failed\n");
1322 /* don't fail SSB init because of this */
1323 err = 0;
1324 }
1325 out:
1326 return err;
1327 }
1328 /* ssb must be initialized after PCI but before the ssb drivers.
1329 * That means we must use some initcall between subsys_initcall
1330 * and device_initcall.
1331 */
1332 fs_initcall(ssb_modinit);
1333
1334 static void __exit ssb_modexit(void)
1335 {
1336 ssb_gige_exit();
1337 ssb_host_pcmcia_exit();
1338 b43_pci_ssb_bridge_exit();
1339 bus_unregister(&ssb_bustype);
1340 }
1341 module_exit(ssb_modexit)
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