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1/*
2 * Broadcom specific AMBA
3 * Bus subsystem
4 *
5 * Licensed under the GNU/GPL. See COPYING for details.
6 */
7
8#include "bcma_private.h"
9#include <linux/module.h>
10#include <linux/mmc/sdio_func.h>
11#include <linux/platform_device.h>
12#include <linux/pci.h>
13#include <linux/bcma/bcma.h>
14#include <linux/slab.h>
15#include <linux/of_address.h>
16#include <linux/of_irq.h>
17#include <linux/of_device.h>
18#include <linux/of_platform.h>
19
20MODULE_DESCRIPTION("Broadcom's specific AMBA driver");
21MODULE_LICENSE("GPL");
22
23/* contains the number the next bus should get. */
24static unsigned int bcma_bus_next_num;
25
26/* bcma_buses_mutex locks the bcma_bus_next_num */
27static DEFINE_MUTEX(bcma_buses_mutex);
28
29static int bcma_bus_match(struct device *dev, const struct device_driver *drv);
30static int bcma_device_probe(struct device *dev);
31static void bcma_device_remove(struct device *dev);
32static int bcma_device_uevent(const struct device *dev, struct kobj_uevent_env *env);
33
34static ssize_t manuf_show(struct device *dev, struct device_attribute *attr, char *buf)
35{
36 struct bcma_device *core = container_of(dev, struct bcma_device, dev);
37 return sprintf(buf, "0x%03X\n", core->id.manuf);
38}
39static DEVICE_ATTR_RO(manuf);
40
41static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf)
42{
43 struct bcma_device *core = container_of(dev, struct bcma_device, dev);
44 return sprintf(buf, "0x%03X\n", core->id.id);
45}
46static DEVICE_ATTR_RO(id);
47
48static ssize_t rev_show(struct device *dev, struct device_attribute *attr, char *buf)
49{
50 struct bcma_device *core = container_of(dev, struct bcma_device, dev);
51 return sprintf(buf, "0x%02X\n", core->id.rev);
52}
53static DEVICE_ATTR_RO(rev);
54
55static ssize_t class_show(struct device *dev, struct device_attribute *attr, char *buf)
56{
57 struct bcma_device *core = container_of(dev, struct bcma_device, dev);
58 return sprintf(buf, "0x%X\n", core->id.class);
59}
60static DEVICE_ATTR_RO(class);
61
62static struct attribute *bcma_device_attrs[] = {
63 &dev_attr_manuf.attr,
64 &dev_attr_id.attr,
65 &dev_attr_rev.attr,
66 &dev_attr_class.attr,
67 NULL,
68};
69ATTRIBUTE_GROUPS(bcma_device);
70
71static const struct bus_type bcma_bus_type = {
72 .name = "bcma",
73 .match = bcma_bus_match,
74 .probe = bcma_device_probe,
75 .remove = bcma_device_remove,
76 .uevent = bcma_device_uevent,
77 .dev_groups = bcma_device_groups,
78};
79
80static u16 bcma_cc_core_id(struct bcma_bus *bus)
81{
82 if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
83 return BCMA_CORE_4706_CHIPCOMMON;
84 return BCMA_CORE_CHIPCOMMON;
85}
86
87struct bcma_device *bcma_find_core_unit(struct bcma_bus *bus, u16 coreid,
88 u8 unit)
89{
90 struct bcma_device *core;
91
92 list_for_each_entry(core, &bus->cores, list) {
93 if (core->id.id == coreid && core->core_unit == unit)
94 return core;
95 }
96 return NULL;
97}
98EXPORT_SYMBOL_GPL(bcma_find_core_unit);
99
100bool bcma_wait_value(struct bcma_device *core, u16 reg, u32 mask, u32 value,
101 int timeout)
102{
103 unsigned long deadline = jiffies + timeout;
104 u32 val;
105
106 do {
107 val = bcma_read32(core, reg);
108 if ((val & mask) == value)
109 return true;
110 cpu_relax();
111 udelay(10);
112 } while (!time_after_eq(jiffies, deadline));
113
114 bcma_warn(core->bus, "Timeout waiting for register 0x%04X!\n", reg);
115
116 return false;
117}
118
119static void bcma_release_core_dev(struct device *dev)
120{
121 struct bcma_device *core = container_of(dev, struct bcma_device, dev);
122 if (core->io_addr)
123 iounmap(core->io_addr);
124 if (core->io_wrap)
125 iounmap(core->io_wrap);
126 kfree(core);
127}
128
129static bool bcma_is_core_needed_early(u16 core_id)
130{
131 switch (core_id) {
132 case BCMA_CORE_NS_NAND:
133 case BCMA_CORE_NS_QSPI:
134 return true;
135 }
136
137 return false;
138}
139
140static struct device_node *bcma_of_find_child_device(struct device *parent,
141 struct bcma_device *core)
142{
143 struct device_node *node;
144 int ret;
145
146 if (!parent->of_node)
147 return NULL;
148
149 for_each_child_of_node(parent->of_node, node) {
150 struct resource res;
151 ret = of_address_to_resource(node, 0, &res);
152 if (ret)
153 continue;
154 if (res.start == core->addr)
155 return node;
156 }
157 return NULL;
158}
159
160static int bcma_of_irq_parse(struct device *parent,
161 struct bcma_device *core,
162 struct of_phandle_args *out_irq, int num)
163{
164 __be32 laddr[1];
165 int rc;
166
167 if (core->dev.of_node) {
168 rc = of_irq_parse_one(core->dev.of_node, num, out_irq);
169 if (!rc)
170 return rc;
171 }
172
173 out_irq->np = parent->of_node;
174 out_irq->args_count = 1;
175 out_irq->args[0] = num;
176
177 laddr[0] = cpu_to_be32(core->addr);
178 return of_irq_parse_raw(laddr, out_irq);
179}
180
181static unsigned int bcma_of_get_irq(struct device *parent,
182 struct bcma_device *core, int num)
183{
184 struct of_phandle_args out_irq;
185 int ret;
186
187 if (!IS_ENABLED(CONFIG_OF_IRQ) || !parent->of_node)
188 return 0;
189
190 ret = bcma_of_irq_parse(parent, core, &out_irq, num);
191 if (ret) {
192 bcma_debug(core->bus, "bcma_of_get_irq() failed with rc=%d\n",
193 ret);
194 return 0;
195 }
196
197 return irq_create_of_mapping(&out_irq);
198}
199
200static void bcma_of_fill_device(struct device *parent,
201 struct bcma_device *core)
202{
203 struct device_node *node;
204
205 node = bcma_of_find_child_device(parent, core);
206 if (node)
207 core->dev.of_node = node;
208
209 core->irq = bcma_of_get_irq(parent, core, 0);
210
211 of_dma_configure(&core->dev, node, false);
212}
213
214unsigned int bcma_core_irq(struct bcma_device *core, int num)
215{
216 struct bcma_bus *bus = core->bus;
217 unsigned int mips_irq;
218
219 switch (bus->hosttype) {
220 case BCMA_HOSTTYPE_PCI:
221 return bus->host_pci->irq;
222 case BCMA_HOSTTYPE_SOC:
223 if (bus->drv_mips.core && num == 0) {
224 mips_irq = bcma_core_mips_irq(core);
225 return mips_irq <= 4 ? mips_irq + 2 : 0;
226 }
227 if (bus->dev)
228 return bcma_of_get_irq(bus->dev, core, num);
229 return 0;
230 case BCMA_HOSTTYPE_SDIO:
231 return 0;
232 }
233
234 return 0;
235}
236EXPORT_SYMBOL(bcma_core_irq);
237
238void bcma_prepare_core(struct bcma_bus *bus, struct bcma_device *core)
239{
240 device_initialize(&core->dev);
241 core->dev.release = bcma_release_core_dev;
242 core->dev.bus = &bcma_bus_type;
243 dev_set_name(&core->dev, "bcma%d:%d", bus->num, core->core_index);
244 core->dev.parent = bus->dev;
245 if (bus->dev)
246 bcma_of_fill_device(bus->dev, core);
247
248 switch (bus->hosttype) {
249 case BCMA_HOSTTYPE_PCI:
250 core->dma_dev = bus->dev;
251 core->irq = bus->host_pci->irq;
252 break;
253 case BCMA_HOSTTYPE_SOC:
254 if (IS_ENABLED(CONFIG_OF) && bus->dev) {
255 core->dma_dev = bus->dev;
256 } else {
257 core->dev.dma_mask = &core->dev.coherent_dma_mask;
258 core->dma_dev = &core->dev;
259 }
260 break;
261 case BCMA_HOSTTYPE_SDIO:
262 break;
263 }
264}
265
266void bcma_init_bus(struct bcma_bus *bus)
267{
268 mutex_lock(&bcma_buses_mutex);
269 bus->num = bcma_bus_next_num++;
270 mutex_unlock(&bcma_buses_mutex);
271
272 INIT_LIST_HEAD(&bus->cores);
273 bus->nr_cores = 0;
274
275 bcma_detect_chip(bus);
276}
277
278static void bcma_register_core(struct bcma_bus *bus, struct bcma_device *core)
279{
280 int err;
281
282 err = device_add(&core->dev);
283 if (err) {
284 bcma_err(bus, "Could not register dev for core 0x%03X\n",
285 core->id.id);
286 return;
287 }
288 core->dev_registered = true;
289}
290
291static int bcma_register_devices(struct bcma_bus *bus)
292{
293 struct bcma_device *core;
294 int err;
295
296 list_for_each_entry(core, &bus->cores, list) {
297 struct device_node *np;
298
299 /* We support that core ourselves */
300 switch (core->id.id) {
301 case BCMA_CORE_4706_CHIPCOMMON:
302 case BCMA_CORE_CHIPCOMMON:
303 case BCMA_CORE_NS_CHIPCOMMON_B:
304 case BCMA_CORE_PCI:
305 case BCMA_CORE_PCIE:
306 case BCMA_CORE_PCIE2:
307 case BCMA_CORE_MIPS_74K:
308 case BCMA_CORE_4706_MAC_GBIT_COMMON:
309 continue;
310 }
311
312 /* Early cores were already registered */
313 if (bcma_is_core_needed_early(core->id.id))
314 continue;
315
316 np = core->dev.of_node;
317 if (np && !of_device_is_available(np))
318 continue;
319
320 /* Only first GMAC core on BCM4706 is connected and working */
321 if (core->id.id == BCMA_CORE_4706_MAC_GBIT &&
322 core->core_unit > 0)
323 continue;
324
325 bcma_register_core(bus, core);
326 }
327
328#ifdef CONFIG_BCMA_PFLASH
329 if (bus->drv_cc.pflash.present) {
330 err = platform_device_register(&bcma_pflash_dev);
331 if (err)
332 bcma_err(bus, "Error registering parallel flash\n");
333 }
334#endif
335
336#ifdef CONFIG_BCMA_SFLASH
337 if (bus->drv_cc.sflash.present) {
338 err = platform_device_register(&bcma_sflash_dev);
339 if (err)
340 bcma_err(bus, "Error registering serial flash\n");
341 }
342#endif
343
344#ifdef CONFIG_BCMA_NFLASH
345 if (bus->drv_cc.nflash.present) {
346 err = platform_device_register(&bcma_nflash_dev);
347 if (err)
348 bcma_err(bus, "Error registering NAND flash\n");
349 }
350#endif
351 err = bcma_gpio_init(&bus->drv_cc);
352 if (err == -ENOTSUPP)
353 bcma_debug(bus, "GPIO driver not activated\n");
354 else if (err) {
355 bcma_err(bus, "Error registering GPIO driver: %i\n", err);
356 return err;
357 }
358
359 if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
360 err = bcma_chipco_watchdog_register(&bus->drv_cc);
361 if (err)
362 bcma_err(bus, "Error registering watchdog driver\n");
363 }
364
365 return 0;
366}
367
368void bcma_unregister_cores(struct bcma_bus *bus)
369{
370 struct bcma_device *core, *tmp;
371
372 list_for_each_entry_safe(core, tmp, &bus->cores, list) {
373 if (!core->dev_registered)
374 continue;
375 list_del(&core->list);
376 device_unregister(&core->dev);
377 }
378 if (bus->hosttype == BCMA_HOSTTYPE_SOC)
379 platform_device_unregister(bus->drv_cc.watchdog);
380
381 /* Now no one uses internally-handled cores, we can free them */
382 list_for_each_entry_safe(core, tmp, &bus->cores, list) {
383 list_del(&core->list);
384 put_device(&core->dev);
385 }
386}
387
388int bcma_bus_register(struct bcma_bus *bus)
389{
390 int err;
391 struct bcma_device *core;
392
393 /* Scan for devices (cores) */
394 err = bcma_bus_scan(bus);
395 if (err) {
396 bcma_err(bus, "Failed to scan: %d\n", err);
397 return err;
398 }
399
400 /* Early init CC core */
401 core = bcma_find_core(bus, bcma_cc_core_id(bus));
402 if (core) {
403 bus->drv_cc.core = core;
404 bcma_core_chipcommon_early_init(&bus->drv_cc);
405 }
406
407 /* Early init PCIE core */
408 core = bcma_find_core(bus, BCMA_CORE_PCIE);
409 if (core) {
410 bus->drv_pci[0].core = core;
411 bcma_core_pci_early_init(&bus->drv_pci[0]);
412 }
413
414 if (bus->dev)
415 of_platform_default_populate(bus->dev->of_node, NULL, bus->dev);
416
417 /* Cores providing flash access go before SPROM init */
418 list_for_each_entry(core, &bus->cores, list) {
419 if (bcma_is_core_needed_early(core->id.id))
420 bcma_register_core(bus, core);
421 }
422
423 /* Try to get SPROM */
424 err = bcma_sprom_get(bus);
425 if (err == -ENOENT) {
426 bcma_err(bus, "No SPROM available\n");
427 } else if (err)
428 bcma_err(bus, "Failed to get SPROM: %d\n", err);
429
430 /* Init CC core */
431 core = bcma_find_core(bus, bcma_cc_core_id(bus));
432 if (core) {
433 bus->drv_cc.core = core;
434 bcma_core_chipcommon_init(&bus->drv_cc);
435 }
436
437 /* Init CC core */
438 core = bcma_find_core(bus, BCMA_CORE_NS_CHIPCOMMON_B);
439 if (core) {
440 bus->drv_cc_b.core = core;
441 bcma_core_chipcommon_b_init(&bus->drv_cc_b);
442 }
443
444 /* Init MIPS core */
445 core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
446 if (core) {
447 bus->drv_mips.core = core;
448 bcma_core_mips_init(&bus->drv_mips);
449 }
450
451 /* Init PCIE core */
452 core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 0);
453 if (core) {
454 bus->drv_pci[0].core = core;
455 bcma_core_pci_init(&bus->drv_pci[0]);
456 }
457
458 /* Init PCIE core */
459 core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 1);
460 if (core) {
461 bus->drv_pci[1].core = core;
462 bcma_core_pci_init(&bus->drv_pci[1]);
463 }
464
465 /* Init PCIe Gen 2 core */
466 core = bcma_find_core_unit(bus, BCMA_CORE_PCIE2, 0);
467 if (core) {
468 bus->drv_pcie2.core = core;
469 bcma_core_pcie2_init(&bus->drv_pcie2);
470 }
471
472 /* Init GBIT MAC COMMON core */
473 core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
474 if (core) {
475 bus->drv_gmac_cmn.core = core;
476 bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn);
477 }
478
479 /* Register found cores */
480 bcma_register_devices(bus);
481
482 bcma_info(bus, "Bus registered\n");
483
484 return 0;
485}
486
487void bcma_bus_unregister(struct bcma_bus *bus)
488{
489 int err;
490
491 err = bcma_gpio_unregister(&bus->drv_cc);
492 if (err == -EBUSY)
493 bcma_err(bus, "Some GPIOs are still in use.\n");
494 else if (err)
495 bcma_err(bus, "Can not unregister GPIO driver: %i\n", err);
496
497 bcma_core_chipcommon_b_free(&bus->drv_cc_b);
498
499 bcma_unregister_cores(bus);
500}
501
502/*
503 * This is a special version of bus registration function designed for SoCs.
504 * It scans bus and performs basic initialization of main cores only.
505 * Please note it requires memory allocation, however it won't try to sleep.
506 */
507int __init bcma_bus_early_register(struct bcma_bus *bus)
508{
509 int err;
510 struct bcma_device *core;
511
512 /* Scan for devices (cores) */
513 err = bcma_bus_scan(bus);
514 if (err) {
515 bcma_err(bus, "Failed to scan bus: %d\n", err);
516 return -1;
517 }
518
519 /* Early init CC core */
520 core = bcma_find_core(bus, bcma_cc_core_id(bus));
521 if (core) {
522 bus->drv_cc.core = core;
523 bcma_core_chipcommon_early_init(&bus->drv_cc);
524 }
525
526 /* Early init MIPS core */
527 core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
528 if (core) {
529 bus->drv_mips.core = core;
530 bcma_core_mips_early_init(&bus->drv_mips);
531 }
532
533 bcma_info(bus, "Early bus registered\n");
534
535 return 0;
536}
537
538#ifdef CONFIG_PM
539int bcma_bus_suspend(struct bcma_bus *bus)
540{
541 struct bcma_device *core;
542
543 list_for_each_entry(core, &bus->cores, list) {
544 struct device_driver *drv = core->dev.driver;
545 if (drv) {
546 struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
547 if (adrv->suspend)
548 adrv->suspend(core);
549 }
550 }
551 return 0;
552}
553
554int bcma_bus_resume(struct bcma_bus *bus)
555{
556 struct bcma_device *core;
557
558 /* Init CC core */
559 if (bus->drv_cc.core) {
560 bus->drv_cc.setup_done = false;
561 bcma_core_chipcommon_init(&bus->drv_cc);
562 }
563
564 list_for_each_entry(core, &bus->cores, list) {
565 struct device_driver *drv = core->dev.driver;
566 if (drv) {
567 struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
568 if (adrv->resume)
569 adrv->resume(core);
570 }
571 }
572
573 return 0;
574}
575#endif
576
577int __bcma_driver_register(struct bcma_driver *drv, struct module *owner)
578{
579 drv->drv.name = drv->name;
580 drv->drv.bus = &bcma_bus_type;
581 drv->drv.owner = owner;
582
583 return driver_register(&drv->drv);
584}
585EXPORT_SYMBOL_GPL(__bcma_driver_register);
586
587void bcma_driver_unregister(struct bcma_driver *drv)
588{
589 driver_unregister(&drv->drv);
590}
591EXPORT_SYMBOL_GPL(bcma_driver_unregister);
592
593static int bcma_bus_match(struct device *dev, const struct device_driver *drv)
594{
595 struct bcma_device *core = container_of(dev, struct bcma_device, dev);
596 const struct bcma_driver *adrv = container_of_const(drv, struct bcma_driver, drv);
597 const struct bcma_device_id *cid = &core->id;
598 const struct bcma_device_id *did;
599
600 for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) {
601 if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) &&
602 (did->id == cid->id || did->id == BCMA_ANY_ID) &&
603 (did->rev == cid->rev || did->rev == BCMA_ANY_REV) &&
604 (did->class == cid->class || did->class == BCMA_ANY_CLASS))
605 return 1;
606 }
607 return 0;
608}
609
610static int bcma_device_probe(struct device *dev)
611{
612 struct bcma_device *core = container_of(dev, struct bcma_device, dev);
613 struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
614 drv);
615 int err = 0;
616
617 get_device(dev);
618 if (adrv->probe)
619 err = adrv->probe(core);
620 if (err)
621 put_device(dev);
622
623 return err;
624}
625
626static void bcma_device_remove(struct device *dev)
627{
628 struct bcma_device *core = container_of(dev, struct bcma_device, dev);
629 struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
630 drv);
631
632 if (adrv->remove)
633 adrv->remove(core);
634 put_device(dev);
635}
636
637static int bcma_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
638{
639 const struct bcma_device *core = container_of_const(dev, struct bcma_device, dev);
640
641 return add_uevent_var(env,
642 "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X",
643 core->id.manuf, core->id.id,
644 core->id.rev, core->id.class);
645}
646
647static unsigned int bcma_bus_registered;
648
649/*
650 * If built-in, bus has to be registered early, before any driver calls
651 * bcma_driver_register.
652 * Otherwise registering driver would trigger BUG in driver_register.
653 */
654static int __init bcma_init_bus_register(void)
655{
656 int err;
657
658 if (bcma_bus_registered)
659 return 0;
660
661 err = bus_register(&bcma_bus_type);
662 if (!err)
663 bcma_bus_registered = 1;
664
665 return err;
666}
667#ifndef MODULE
668fs_initcall(bcma_init_bus_register);
669#endif
670
671/* Main initialization has to be done with SPI/mtd/NAND/SPROM available */
672static int __init bcma_modinit(void)
673{
674 int err;
675
676 err = bcma_init_bus_register();
677 if (err)
678 return err;
679
680 err = bcma_host_soc_register_driver();
681 if (err) {
682 pr_err("SoC host initialization failed\n");
683 err = 0;
684 }
685#ifdef CONFIG_BCMA_HOST_PCI
686 err = bcma_host_pci_init();
687 if (err) {
688 pr_err("PCI host initialization failed\n");
689 err = 0;
690 }
691#endif
692
693 return err;
694}
695module_init(bcma_modinit);
696
697static void __exit bcma_modexit(void)
698{
699#ifdef CONFIG_BCMA_HOST_PCI
700 bcma_host_pci_exit();
701#endif
702 bcma_host_soc_unregister_driver();
703 bus_unregister(&bcma_bus_type);
704}
705module_exit(bcma_modexit)