main.c

  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)