xref: /openbmc/linux/drivers/bcma/main.c (revision f35e839a) 
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/platform_device.h>
11 #include <linux/bcma/bcma.h>
12 #include <linux/slab.h>
13 
14 MODULE_DESCRIPTION("Broadcom's specific AMBA driver");
15 MODULE_LICENSE("GPL");
16 
17 /* contains the number the next bus should get. */
18 static unsigned int bcma_bus_next_num = 0;
19 
20 /* bcma_buses_mutex locks the bcma_bus_next_num */
21 static DEFINE_MUTEX(bcma_buses_mutex);
22 
23 static int bcma_bus_match(struct device *dev, struct device_driver *drv);
24 static int bcma_device_probe(struct device *dev);
25 static int bcma_device_remove(struct device *dev);
26 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env);
27 
28 static ssize_t manuf_show(struct device *dev, struct device_attribute *attr, char *buf)
29 {
30 	struct bcma_device *core = container_of(dev, struct bcma_device, dev);
31 	return sprintf(buf, "0x%03X\n", core->id.manuf);
32 }
33 static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf)
34 {
35 	struct bcma_device *core = container_of(dev, struct bcma_device, dev);
36 	return sprintf(buf, "0x%03X\n", core->id.id);
37 }
38 static ssize_t rev_show(struct device *dev, struct device_attribute *attr, char *buf)
39 {
40 	struct bcma_device *core = container_of(dev, struct bcma_device, dev);
41 	return sprintf(buf, "0x%02X\n", core->id.rev);
42 }
43 static ssize_t class_show(struct device *dev, struct device_attribute *attr, char *buf)
44 {
45 	struct bcma_device *core = container_of(dev, struct bcma_device, dev);
46 	return sprintf(buf, "0x%X\n", core->id.class);
47 }
48 static struct device_attribute bcma_device_attrs[] = {
49 	__ATTR_RO(manuf),
50 	__ATTR_RO(id),
51 	__ATTR_RO(rev),
52 	__ATTR_RO(class),
53 	__ATTR_NULL,
54 };
55 
56 static struct bus_type bcma_bus_type = {
57 	.name		= "bcma",
58 	.match		= bcma_bus_match,
59 	.probe		= bcma_device_probe,
60 	.remove		= bcma_device_remove,
61 	.uevent		= bcma_device_uevent,
62 	.dev_attrs	= bcma_device_attrs,
63 };
64 
65 static u16 bcma_cc_core_id(struct bcma_bus *bus)
66 {
67 	if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
68 		return BCMA_CORE_4706_CHIPCOMMON;
69 	return BCMA_CORE_CHIPCOMMON;
70 }
71 
72 struct bcma_device *bcma_find_core(struct bcma_bus *bus, u16 coreid)
73 {
74 	struct bcma_device *core;
75 
76 	list_for_each_entry(core, &bus->cores, list) {
77 		if (core->id.id == coreid)
78 			return core;
79 	}
80 	return NULL;
81 }
82 EXPORT_SYMBOL_GPL(bcma_find_core);
83 
84 struct bcma_device *bcma_find_core_unit(struct bcma_bus *bus, u16 coreid,
85 					u8 unit)
86 {
87 	struct bcma_device *core;
88 
89 	list_for_each_entry(core, &bus->cores, list) {
90 		if (core->id.id == coreid && core->core_unit == unit)
91 			return core;
92 	}
93 	return NULL;
94 }
95 
96 static void bcma_release_core_dev(struct device *dev)
97 {
98 	struct bcma_device *core = container_of(dev, struct bcma_device, dev);
99 	if (core->io_addr)
100 		iounmap(core->io_addr);
101 	if (core->io_wrap)
102 		iounmap(core->io_wrap);
103 	kfree(core);
104 }
105 
106 static int bcma_register_cores(struct bcma_bus *bus)
107 {
108 	struct bcma_device *core;
109 	int err, dev_id = 0;
110 
111 	list_for_each_entry(core, &bus->cores, list) {
112 		/* We support that cores ourself */
113 		switch (core->id.id) {
114 		case BCMA_CORE_4706_CHIPCOMMON:
115 		case BCMA_CORE_CHIPCOMMON:
116 		case BCMA_CORE_PCI:
117 		case BCMA_CORE_PCIE:
118 		case BCMA_CORE_MIPS_74K:
119 		case BCMA_CORE_4706_MAC_GBIT_COMMON:
120 			continue;
121 		}
122 
123 		/* Only first GMAC core on BCM4706 is connected and working */
124 		if (core->id.id == BCMA_CORE_4706_MAC_GBIT &&
125 		    core->core_unit > 0)
126 			continue;
127 
128 		core->dev.release = bcma_release_core_dev;
129 		core->dev.bus = &bcma_bus_type;
130 		dev_set_name(&core->dev, "bcma%d:%d", bus->num, dev_id);
131 
132 		switch (bus->hosttype) {
133 		case BCMA_HOSTTYPE_PCI:
134 			core->dev.parent = &bus->host_pci->dev;
135 			core->dma_dev = &bus->host_pci->dev;
136 			core->irq = bus->host_pci->irq;
137 			break;
138 		case BCMA_HOSTTYPE_SOC:
139 			core->dev.dma_mask = &core->dev.coherent_dma_mask;
140 			core->dma_dev = &core->dev;
141 			break;
142 		case BCMA_HOSTTYPE_SDIO:
143 			break;
144 		}
145 
146 		err = device_register(&core->dev);
147 		if (err) {
148 			bcma_err(bus,
149 				 "Could not register dev for core 0x%03X\n",
150 				 core->id.id);
151 			continue;
152 		}
153 		core->dev_registered = true;
154 		dev_id++;
155 	}
156 
157 #ifdef CONFIG_BCMA_DRIVER_MIPS
158 	if (bus->drv_cc.pflash.present) {
159 		err = platform_device_register(&bcma_pflash_dev);
160 		if (err)
161 			bcma_err(bus, "Error registering parallel flash\n");
162 	}
163 #endif
164 
165 #ifdef CONFIG_BCMA_SFLASH
166 	if (bus->drv_cc.sflash.present) {
167 		err = platform_device_register(&bcma_sflash_dev);
168 		if (err)
169 			bcma_err(bus, "Error registering serial flash\n");
170 	}
171 #endif
172 
173 #ifdef CONFIG_BCMA_NFLASH
174 	if (bus->drv_cc.nflash.present) {
175 		err = platform_device_register(&bcma_nflash_dev);
176 		if (err)
177 			bcma_err(bus, "Error registering NAND flash\n");
178 	}
179 #endif
180 	err = bcma_gpio_init(&bus->drv_cc);
181 	if (err == -ENOTSUPP)
182 		bcma_debug(bus, "GPIO driver not activated\n");
183 	else if (err)
184 		bcma_err(bus, "Error registering GPIO driver: %i\n", err);
185 
186 	if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
187 		err = bcma_chipco_watchdog_register(&bus->drv_cc);
188 		if (err)
189 			bcma_err(bus, "Error registering watchdog driver\n");
190 	}
191 
192 	return 0;
193 }
194 
195 static void bcma_unregister_cores(struct bcma_bus *bus)
196 {
197 	struct bcma_device *core, *tmp;
198 
199 	list_for_each_entry_safe(core, tmp, &bus->cores, list) {
200 		list_del(&core->list);
201 		if (core->dev_registered)
202 			device_unregister(&core->dev);
203 	}
204 	if (bus->hosttype == BCMA_HOSTTYPE_SOC)
205 		platform_device_unregister(bus->drv_cc.watchdog);
206 }
207 
208 int bcma_bus_register(struct bcma_bus *bus)
209 {
210 	int err;
211 	struct bcma_device *core;
212 
213 	mutex_lock(&bcma_buses_mutex);
214 	bus->num = bcma_bus_next_num++;
215 	mutex_unlock(&bcma_buses_mutex);
216 
217 	/* Scan for devices (cores) */
218 	err = bcma_bus_scan(bus);
219 	if (err) {
220 		bcma_err(bus, "Failed to scan: %d\n", err);
221 		return -1;
222 	}
223 
224 	/* Early init CC core */
225 	core = bcma_find_core(bus, bcma_cc_core_id(bus));
226 	if (core) {
227 		bus->drv_cc.core = core;
228 		bcma_core_chipcommon_early_init(&bus->drv_cc);
229 	}
230 
231 	/* Try to get SPROM */
232 	err = bcma_sprom_get(bus);
233 	if (err == -ENOENT) {
234 		bcma_err(bus, "No SPROM available\n");
235 	} else if (err)
236 		bcma_err(bus, "Failed to get SPROM: %d\n", err);
237 
238 	/* Init CC core */
239 	core = bcma_find_core(bus, bcma_cc_core_id(bus));
240 	if (core) {
241 		bus->drv_cc.core = core;
242 		bcma_core_chipcommon_init(&bus->drv_cc);
243 	}
244 
245 	/* Init MIPS core */
246 	core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
247 	if (core) {
248 		bus->drv_mips.core = core;
249 		bcma_core_mips_init(&bus->drv_mips);
250 	}
251 
252 	/* Init PCIE core */
253 	core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 0);
254 	if (core) {
255 		bus->drv_pci[0].core = core;
256 		bcma_core_pci_init(&bus->drv_pci[0]);
257 	}
258 
259 	/* Init PCIE core */
260 	core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 1);
261 	if (core) {
262 		bus->drv_pci[1].core = core;
263 		bcma_core_pci_init(&bus->drv_pci[1]);
264 	}
265 
266 	/* Init GBIT MAC COMMON core */
267 	core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
268 	if (core) {
269 		bus->drv_gmac_cmn.core = core;
270 		bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn);
271 	}
272 
273 	/* Register found cores */
274 	bcma_register_cores(bus);
275 
276 	bcma_info(bus, "Bus registered\n");
277 
278 	return 0;
279 }
280 
281 void bcma_bus_unregister(struct bcma_bus *bus)
282 {
283 	struct bcma_device *cores[3];
284 	int err;
285 
286 	err = bcma_gpio_unregister(&bus->drv_cc);
287 	if (err == -EBUSY)
288 		bcma_err(bus, "Some GPIOs are still in use.\n");
289 	else if (err)
290 		bcma_err(bus, "Can not unregister GPIO driver: %i\n", err);
291 
292 	cores[0] = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
293 	cores[1] = bcma_find_core(bus, BCMA_CORE_PCIE);
294 	cores[2] = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
295 
296 	bcma_unregister_cores(bus);
297 
298 	kfree(cores[2]);
299 	kfree(cores[1]);
300 	kfree(cores[0]);
301 }
302 
303 int __init bcma_bus_early_register(struct bcma_bus *bus,
304 				   struct bcma_device *core_cc,
305 				   struct bcma_device *core_mips)
306 {
307 	int err;
308 	struct bcma_device *core;
309 	struct bcma_device_id match;
310 
311 	bcma_init_bus(bus);
312 
313 	match.manuf = BCMA_MANUF_BCM;
314 	match.id = bcma_cc_core_id(bus);
315 	match.class = BCMA_CL_SIM;
316 	match.rev = BCMA_ANY_REV;
317 
318 	/* Scan for chip common core */
319 	err = bcma_bus_scan_early(bus, &match, core_cc);
320 	if (err) {
321 		bcma_err(bus, "Failed to scan for common core: %d\n", err);
322 		return -1;
323 	}
324 
325 	match.manuf = BCMA_MANUF_MIPS;
326 	match.id = BCMA_CORE_MIPS_74K;
327 	match.class = BCMA_CL_SIM;
328 	match.rev = BCMA_ANY_REV;
329 
330 	/* Scan for mips core */
331 	err = bcma_bus_scan_early(bus, &match, core_mips);
332 	if (err) {
333 		bcma_err(bus, "Failed to scan for mips core: %d\n", err);
334 		return -1;
335 	}
336 
337 	/* Early init CC core */
338 	core = bcma_find_core(bus, bcma_cc_core_id(bus));
339 	if (core) {
340 		bus->drv_cc.core = core;
341 		bcma_core_chipcommon_early_init(&bus->drv_cc);
342 	}
343 
344 	/* Early init MIPS core */
345 	core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
346 	if (core) {
347 		bus->drv_mips.core = core;
348 		bcma_core_mips_early_init(&bus->drv_mips);
349 	}
350 
351 	bcma_info(bus, "Early bus registered\n");
352 
353 	return 0;
354 }
355 
356 #ifdef CONFIG_PM
357 int bcma_bus_suspend(struct bcma_bus *bus)
358 {
359 	struct bcma_device *core;
360 
361 	list_for_each_entry(core, &bus->cores, list) {
362 		struct device_driver *drv = core->dev.driver;
363 		if (drv) {
364 			struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
365 			if (adrv->suspend)
366 				adrv->suspend(core);
367 		}
368 	}
369 	return 0;
370 }
371 
372 int bcma_bus_resume(struct bcma_bus *bus)
373 {
374 	struct bcma_device *core;
375 
376 	/* Init CC core */
377 	if (bus->drv_cc.core) {
378 		bus->drv_cc.setup_done = false;
379 		bcma_core_chipcommon_init(&bus->drv_cc);
380 	}
381 
382 	list_for_each_entry(core, &bus->cores, list) {
383 		struct device_driver *drv = core->dev.driver;
384 		if (drv) {
385 			struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
386 			if (adrv->resume)
387 				adrv->resume(core);
388 		}
389 	}
390 
391 	return 0;
392 }
393 #endif
394 
395 int __bcma_driver_register(struct bcma_driver *drv, struct module *owner)
396 {
397 	drv->drv.name = drv->name;
398 	drv->drv.bus = &bcma_bus_type;
399 	drv->drv.owner = owner;
400 
401 	return driver_register(&drv->drv);
402 }
403 EXPORT_SYMBOL_GPL(__bcma_driver_register);
404 
405 void bcma_driver_unregister(struct bcma_driver *drv)
406 {
407 	driver_unregister(&drv->drv);
408 }
409 EXPORT_SYMBOL_GPL(bcma_driver_unregister);
410 
411 static int bcma_bus_match(struct device *dev, struct device_driver *drv)
412 {
413 	struct bcma_device *core = container_of(dev, struct bcma_device, dev);
414 	struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
415 	const struct bcma_device_id *cid = &core->id;
416 	const struct bcma_device_id *did;
417 
418 	for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) {
419 	    if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) &&
420 		(did->id == cid->id || did->id == BCMA_ANY_ID) &&
421 		(did->rev == cid->rev || did->rev == BCMA_ANY_REV) &&
422 		(did->class == cid->class || did->class == BCMA_ANY_CLASS))
423 			return 1;
424 	}
425 	return 0;
426 }
427 
428 static int bcma_device_probe(struct device *dev)
429 {
430 	struct bcma_device *core = container_of(dev, struct bcma_device, dev);
431 	struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
432 					       drv);
433 	int err = 0;
434 
435 	if (adrv->probe)
436 		err = adrv->probe(core);
437 
438 	return err;
439 }
440 
441 static int bcma_device_remove(struct device *dev)
442 {
443 	struct bcma_device *core = container_of(dev, struct bcma_device, dev);
444 	struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
445 					       drv);
446 
447 	if (adrv->remove)
448 		adrv->remove(core);
449 
450 	return 0;
451 }
452 
453 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env)
454 {
455 	struct bcma_device *core = container_of(dev, struct bcma_device, dev);
456 
457 	return add_uevent_var(env,
458 			      "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X",
459 			      core->id.manuf, core->id.id,
460 			      core->id.rev, core->id.class);
461 }
462 
463 static int __init bcma_modinit(void)
464 {
465 	int err;
466 
467 	err = bus_register(&bcma_bus_type);
468 	if (err)
469 		return err;
470 
471 #ifdef CONFIG_BCMA_HOST_PCI
472 	err = bcma_host_pci_init();
473 	if (err) {
474 		pr_err("PCI host initialization failed\n");
475 		err = 0;
476 	}
477 #endif
478 
479 	return err;
480 }
481 fs_initcall(bcma_modinit);
482 
483 static void __exit bcma_modexit(void)
484 {
485 #ifdef CONFIG_BCMA_HOST_PCI
486 	bcma_host_pci_exit();
487 #endif
488 	bus_unregister(&bcma_bus_type);
489 }
490 module_exit(bcma_modexit)
491