xref: /openbmc/linux/drivers/bcma/scan.c (revision 9cdb81c7) 
1 /*
2  * Broadcom specific AMBA
3  * Bus scanning
4  *
5  * Licensed under the GNU/GPL. See COPYING for details.
6  */
7 
8 #include "scan.h"
9 #include "bcma_private.h"
10 
11 #include <linux/bcma/bcma.h>
12 #include <linux/bcma/bcma_regs.h>
13 #include <linux/pci.h>
14 #include <linux/io.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/slab.h>
17 
18 struct bcma_device_id_name {
19 	u16 id;
20 	const char *name;
21 };
22 struct bcma_device_id_name bcma_device_names[] = {
23 	{ BCMA_CORE_OOB_ROUTER, "OOB Router" },
24 	{ BCMA_CORE_INVALID, "Invalid" },
25 	{ BCMA_CORE_CHIPCOMMON, "ChipCommon" },
26 	{ BCMA_CORE_ILINE20, "ILine 20" },
27 	{ BCMA_CORE_SRAM, "SRAM" },
28 	{ BCMA_CORE_SDRAM, "SDRAM" },
29 	{ BCMA_CORE_PCI, "PCI" },
30 	{ BCMA_CORE_MIPS, "MIPS" },
31 	{ BCMA_CORE_ETHERNET, "Fast Ethernet" },
32 	{ BCMA_CORE_V90, "V90" },
33 	{ BCMA_CORE_USB11_HOSTDEV, "USB 1.1 Hostdev" },
34 	{ BCMA_CORE_ADSL, "ADSL" },
35 	{ BCMA_CORE_ILINE100, "ILine 100" },
36 	{ BCMA_CORE_IPSEC, "IPSEC" },
37 	{ BCMA_CORE_UTOPIA, "UTOPIA" },
38 	{ BCMA_CORE_PCMCIA, "PCMCIA" },
39 	{ BCMA_CORE_INTERNAL_MEM, "Internal Memory" },
40 	{ BCMA_CORE_MEMC_SDRAM, "MEMC SDRAM" },
41 	{ BCMA_CORE_OFDM, "OFDM" },
42 	{ BCMA_CORE_EXTIF, "EXTIF" },
43 	{ BCMA_CORE_80211, "IEEE 802.11" },
44 	{ BCMA_CORE_PHY_A, "PHY A" },
45 	{ BCMA_CORE_PHY_B, "PHY B" },
46 	{ BCMA_CORE_PHY_G, "PHY G" },
47 	{ BCMA_CORE_MIPS_3302, "MIPS 3302" },
48 	{ BCMA_CORE_USB11_HOST, "USB 1.1 Host" },
49 	{ BCMA_CORE_USB11_DEV, "USB 1.1 Device" },
50 	{ BCMA_CORE_USB20_HOST, "USB 2.0 Host" },
51 	{ BCMA_CORE_USB20_DEV, "USB 2.0 Device" },
52 	{ BCMA_CORE_SDIO_HOST, "SDIO Host" },
53 	{ BCMA_CORE_ROBOSWITCH, "Roboswitch" },
54 	{ BCMA_CORE_PARA_ATA, "PATA" },
55 	{ BCMA_CORE_SATA_XORDMA, "SATA XOR-DMA" },
56 	{ BCMA_CORE_ETHERNET_GBIT, "GBit Ethernet" },
57 	{ BCMA_CORE_PCIE, "PCIe" },
58 	{ BCMA_CORE_PHY_N, "PHY N" },
59 	{ BCMA_CORE_SRAM_CTL, "SRAM Controller" },
60 	{ BCMA_CORE_MINI_MACPHY, "Mini MACPHY" },
61 	{ BCMA_CORE_ARM_1176, "ARM 1176" },
62 	{ BCMA_CORE_ARM_7TDMI, "ARM 7TDMI" },
63 	{ BCMA_CORE_PHY_LP, "PHY LP" },
64 	{ BCMA_CORE_PMU, "PMU" },
65 	{ BCMA_CORE_PHY_SSN, "PHY SSN" },
66 	{ BCMA_CORE_SDIO_DEV, "SDIO Device" },
67 	{ BCMA_CORE_ARM_CM3, "ARM CM3" },
68 	{ BCMA_CORE_PHY_HT, "PHY HT" },
69 	{ BCMA_CORE_MIPS_74K, "MIPS 74K" },
70 	{ BCMA_CORE_MAC_GBIT, "GBit MAC" },
71 	{ BCMA_CORE_DDR12_MEM_CTL, "DDR1/DDR2 Memory Controller" },
72 	{ BCMA_CORE_PCIE_RC, "PCIe Root Complex" },
73 	{ BCMA_CORE_OCP_OCP_BRIDGE, "OCP to OCP Bridge" },
74 	{ BCMA_CORE_SHARED_COMMON, "Common Shared" },
75 	{ BCMA_CORE_OCP_AHB_BRIDGE, "OCP to AHB Bridge" },
76 	{ BCMA_CORE_SPI_HOST, "SPI Host" },
77 	{ BCMA_CORE_I2S, "I2S" },
78 	{ BCMA_CORE_SDR_DDR1_MEM_CTL, "SDR/DDR1 Memory Controller" },
79 	{ BCMA_CORE_SHIM, "SHIM" },
80 	{ BCMA_CORE_DEFAULT, "Default" },
81 };
82 const char *bcma_device_name(struct bcma_device_id *id)
83 {
84 	int i;
85 
86 	if (id->manuf == BCMA_MANUF_BCM) {
87 		for (i = 0; i < ARRAY_SIZE(bcma_device_names); i++) {
88 			if (bcma_device_names[i].id == id->id)
89 				return bcma_device_names[i].name;
90 		}
91 	}
92 	return "UNKNOWN";
93 }
94 
95 static u32 bcma_scan_read32(struct bcma_bus *bus, u8 current_coreidx,
96 		       u16 offset)
97 {
98 	return readl(bus->mmio + offset);
99 }
100 
101 static void bcma_scan_switch_core(struct bcma_bus *bus, u32 addr)
102 {
103 	if (bus->hosttype == BCMA_HOSTTYPE_PCI)
104 		pci_write_config_dword(bus->host_pci, BCMA_PCI_BAR0_WIN,
105 				       addr);
106 }
107 
108 static u32 bcma_erom_get_ent(struct bcma_bus *bus, u32 **eromptr)
109 {
110 	u32 ent = readl(*eromptr);
111 	(*eromptr)++;
112 	return ent;
113 }
114 
115 static void bcma_erom_push_ent(u32 **eromptr)
116 {
117 	(*eromptr)--;
118 }
119 
120 static s32 bcma_erom_get_ci(struct bcma_bus *bus, u32 **eromptr)
121 {
122 	u32 ent = bcma_erom_get_ent(bus, eromptr);
123 	if (!(ent & SCAN_ER_VALID))
124 		return -ENOENT;
125 	if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_CI)
126 		return -ENOENT;
127 	return ent;
128 }
129 
130 static bool bcma_erom_is_end(struct bcma_bus *bus, u32 **eromptr)
131 {
132 	u32 ent = bcma_erom_get_ent(bus, eromptr);
133 	bcma_erom_push_ent(eromptr);
134 	return (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID));
135 }
136 
137 static bool bcma_erom_is_bridge(struct bcma_bus *bus, u32 **eromptr)
138 {
139 	u32 ent = bcma_erom_get_ent(bus, eromptr);
140 	bcma_erom_push_ent(eromptr);
141 	return (((ent & SCAN_ER_VALID)) &&
142 		((ent & SCAN_ER_TAGX) == SCAN_ER_TAG_ADDR) &&
143 		((ent & SCAN_ADDR_TYPE) == SCAN_ADDR_TYPE_BRIDGE));
144 }
145 
146 static void bcma_erom_skip_component(struct bcma_bus *bus, u32 **eromptr)
147 {
148 	u32 ent;
149 	while (1) {
150 		ent = bcma_erom_get_ent(bus, eromptr);
151 		if ((ent & SCAN_ER_VALID) &&
152 		    ((ent & SCAN_ER_TAG) == SCAN_ER_TAG_CI))
153 			break;
154 		if (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID))
155 			break;
156 	}
157 	bcma_erom_push_ent(eromptr);
158 }
159 
160 static s32 bcma_erom_get_mst_port(struct bcma_bus *bus, u32 **eromptr)
161 {
162 	u32 ent = bcma_erom_get_ent(bus, eromptr);
163 	if (!(ent & SCAN_ER_VALID))
164 		return -ENOENT;
165 	if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_MP)
166 		return -ENOENT;
167 	return ent;
168 }
169 
170 static s32 bcma_erom_get_addr_desc(struct bcma_bus *bus, u32 **eromptr,
171 				  u32 type, u8 port)
172 {
173 	u32 addrl, addrh, sizel, sizeh = 0;
174 	u32 size;
175 
176 	u32 ent = bcma_erom_get_ent(bus, eromptr);
177 	if ((!(ent & SCAN_ER_VALID)) ||
178 	    ((ent & SCAN_ER_TAGX) != SCAN_ER_TAG_ADDR) ||
179 	    ((ent & SCAN_ADDR_TYPE) != type) ||
180 	    (((ent & SCAN_ADDR_PORT) >> SCAN_ADDR_PORT_SHIFT) != port)) {
181 		bcma_erom_push_ent(eromptr);
182 		return -EINVAL;
183 	}
184 
185 	addrl = ent & SCAN_ADDR_ADDR;
186 	if (ent & SCAN_ADDR_AG32)
187 		addrh = bcma_erom_get_ent(bus, eromptr);
188 	else
189 		addrh = 0;
190 
191 	if ((ent & SCAN_ADDR_SZ) == SCAN_ADDR_SZ_SZD) {
192 		size = bcma_erom_get_ent(bus, eromptr);
193 		sizel = size & SCAN_SIZE_SZ;
194 		if (size & SCAN_SIZE_SG32)
195 			sizeh = bcma_erom_get_ent(bus, eromptr);
196 	} else
197 		sizel = SCAN_ADDR_SZ_BASE <<
198 				((ent & SCAN_ADDR_SZ) >> SCAN_ADDR_SZ_SHIFT);
199 
200 	return addrl;
201 }
202 
203 static struct bcma_device *bcma_find_core_by_index(struct bcma_bus *bus,
204 						   u16 index)
205 {
206 	struct bcma_device *core;
207 
208 	list_for_each_entry(core, &bus->cores, list) {
209 		if (core->core_index == index)
210 			return core;
211 	}
212 	return NULL;
213 }
214 
215 static struct bcma_device *bcma_find_core_reverse(struct bcma_bus *bus, u16 coreid)
216 {
217 	struct bcma_device *core;
218 
219 	list_for_each_entry_reverse(core, &bus->cores, list) {
220 		if (core->id.id == coreid)
221 			return core;
222 	}
223 	return NULL;
224 }
225 
226 static int bcma_get_next_core(struct bcma_bus *bus, u32 __iomem **eromptr,
227 			      struct bcma_device_id *match, int core_num,
228 			      struct bcma_device *core)
229 {
230 	s32 tmp;
231 	u8 i, j;
232 	s32 cia, cib;
233 	u8 ports[2], wrappers[2];
234 
235 	/* get CIs */
236 	cia = bcma_erom_get_ci(bus, eromptr);
237 	if (cia < 0) {
238 		bcma_erom_push_ent(eromptr);
239 		if (bcma_erom_is_end(bus, eromptr))
240 			return -ESPIPE;
241 		return -EILSEQ;
242 	}
243 	cib = bcma_erom_get_ci(bus, eromptr);
244 	if (cib < 0)
245 		return -EILSEQ;
246 
247 	/* parse CIs */
248 	core->id.class = (cia & SCAN_CIA_CLASS) >> SCAN_CIA_CLASS_SHIFT;
249 	core->id.id = (cia & SCAN_CIA_ID) >> SCAN_CIA_ID_SHIFT;
250 	core->id.manuf = (cia & SCAN_CIA_MANUF) >> SCAN_CIA_MANUF_SHIFT;
251 	ports[0] = (cib & SCAN_CIB_NMP) >> SCAN_CIB_NMP_SHIFT;
252 	ports[1] = (cib & SCAN_CIB_NSP) >> SCAN_CIB_NSP_SHIFT;
253 	wrappers[0] = (cib & SCAN_CIB_NMW) >> SCAN_CIB_NMW_SHIFT;
254 	wrappers[1] = (cib & SCAN_CIB_NSW) >> SCAN_CIB_NSW_SHIFT;
255 	core->id.rev = (cib & SCAN_CIB_REV) >> SCAN_CIB_REV_SHIFT;
256 
257 	if (((core->id.manuf == BCMA_MANUF_ARM) &&
258 	     (core->id.id == 0xFFF)) ||
259 	    (ports[1] == 0)) {
260 		bcma_erom_skip_component(bus, eromptr);
261 		return -ENXIO;
262 	}
263 
264 	/* check if component is a core at all */
265 	if (wrappers[0] + wrappers[1] == 0) {
266 		/* we could save addrl of the router
267 		if (cid == BCMA_CORE_OOB_ROUTER)
268 		 */
269 		bcma_erom_skip_component(bus, eromptr);
270 		return -ENXIO;
271 	}
272 
273 	if (bcma_erom_is_bridge(bus, eromptr)) {
274 		bcma_erom_skip_component(bus, eromptr);
275 		return -ENXIO;
276 	}
277 
278 	if (bcma_find_core_by_index(bus, core_num)) {
279 		bcma_erom_skip_component(bus, eromptr);
280 		return -ENODEV;
281 	}
282 
283 	if (match && ((match->manuf != BCMA_ANY_MANUF &&
284 	      match->manuf != core->id.manuf) ||
285 	     (match->id != BCMA_ANY_ID && match->id != core->id.id) ||
286 	     (match->rev != BCMA_ANY_REV && match->rev != core->id.rev) ||
287 	     (match->class != BCMA_ANY_CLASS && match->class != core->id.class)
288 	    )) {
289 		bcma_erom_skip_component(bus, eromptr);
290 		return -ENODEV;
291 	}
292 
293 	/* get & parse master ports */
294 	for (i = 0; i < ports[0]; i++) {
295 		s32 mst_port_d = bcma_erom_get_mst_port(bus, eromptr);
296 		if (mst_port_d < 0)
297 			return -EILSEQ;
298 	}
299 
300 	/* get & parse slave ports */
301 	for (i = 0; i < ports[1]; i++) {
302 		for (j = 0; ; j++) {
303 			tmp = bcma_erom_get_addr_desc(bus, eromptr,
304 				SCAN_ADDR_TYPE_SLAVE, i);
305 			if (tmp < 0) {
306 				/* no more entries for port _i_ */
307 				/* pr_debug("erom: slave port %d "
308 				 * "has %d descriptors\n", i, j); */
309 				break;
310 			} else {
311 				if (i == 0 && j == 0)
312 					core->addr = tmp;
313 			}
314 		}
315 	}
316 
317 	/* get & parse master wrappers */
318 	for (i = 0; i < wrappers[0]; i++) {
319 		for (j = 0; ; j++) {
320 			tmp = bcma_erom_get_addr_desc(bus, eromptr,
321 				SCAN_ADDR_TYPE_MWRAP, i);
322 			if (tmp < 0) {
323 				/* no more entries for port _i_ */
324 				/* pr_debug("erom: master wrapper %d "
325 				 * "has %d descriptors\n", i, j); */
326 				break;
327 			} else {
328 				if (i == 0 && j == 0)
329 					core->wrap = tmp;
330 			}
331 		}
332 	}
333 
334 	/* get & parse slave wrappers */
335 	for (i = 0; i < wrappers[1]; i++) {
336 		u8 hack = (ports[1] == 1) ? 0 : 1;
337 		for (j = 0; ; j++) {
338 			tmp = bcma_erom_get_addr_desc(bus, eromptr,
339 				SCAN_ADDR_TYPE_SWRAP, i + hack);
340 			if (tmp < 0) {
341 				/* no more entries for port _i_ */
342 				/* pr_debug("erom: master wrapper %d "
343 				 * has %d descriptors\n", i, j); */
344 				break;
345 			} else {
346 				if (wrappers[0] == 0 && !i && !j)
347 					core->wrap = tmp;
348 			}
349 		}
350 	}
351 	if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
352 		core->io_addr = ioremap_nocache(core->addr, BCMA_CORE_SIZE);
353 		if (!core->io_addr)
354 			return -ENOMEM;
355 		core->io_wrap = ioremap_nocache(core->wrap, BCMA_CORE_SIZE);
356 		if (!core->io_wrap) {
357 			iounmap(core->io_addr);
358 			return -ENOMEM;
359 		}
360 	}
361 	return 0;
362 }
363 
364 void bcma_init_bus(struct bcma_bus *bus)
365 {
366 	s32 tmp;
367 	struct bcma_chipinfo *chipinfo = &(bus->chipinfo);
368 
369 	if (bus->init_done)
370 		return;
371 
372 	INIT_LIST_HEAD(&bus->cores);
373 	bus->nr_cores = 0;
374 
375 	bcma_scan_switch_core(bus, BCMA_ADDR_BASE);
376 
377 	tmp = bcma_scan_read32(bus, 0, BCMA_CC_ID);
378 	chipinfo->id = (tmp & BCMA_CC_ID_ID) >> BCMA_CC_ID_ID_SHIFT;
379 	chipinfo->rev = (tmp & BCMA_CC_ID_REV) >> BCMA_CC_ID_REV_SHIFT;
380 	chipinfo->pkg = (tmp & BCMA_CC_ID_PKG) >> BCMA_CC_ID_PKG_SHIFT;
381 	pr_info("Found chip with id 0x%04X, rev 0x%02X and package 0x%02X\n",
382 		chipinfo->id, chipinfo->rev, chipinfo->pkg);
383 
384 	bus->init_done = true;
385 }
386 
387 int bcma_bus_scan(struct bcma_bus *bus)
388 {
389 	u32 erombase;
390 	u32 __iomem *eromptr, *eromend;
391 
392 	int err, core_num = 0;
393 
394 	bcma_init_bus(bus);
395 
396 	erombase = bcma_scan_read32(bus, 0, BCMA_CC_EROM);
397 	if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
398 		eromptr = ioremap_nocache(erombase, BCMA_CORE_SIZE);
399 		if (!eromptr)
400 			return -ENOMEM;
401 	} else {
402 		eromptr = bus->mmio;
403 	}
404 
405 	eromend = eromptr + BCMA_CORE_SIZE / sizeof(u32);
406 
407 	bcma_scan_switch_core(bus, erombase);
408 
409 	while (eromptr < eromend) {
410 		struct bcma_device *other_core;
411 		struct bcma_device *core = kzalloc(sizeof(*core), GFP_KERNEL);
412 		if (!core)
413 			return -ENOMEM;
414 		INIT_LIST_HEAD(&core->list);
415 		core->bus = bus;
416 
417 		err = bcma_get_next_core(bus, &eromptr, NULL, core_num, core);
418 		if (err < 0) {
419 			kfree(core);
420 			if (err == -ENODEV) {
421 				core_num++;
422 				continue;
423 			} else if (err == -ENXIO) {
424 				continue;
425 			} else if (err == -ESPIPE) {
426 				break;
427 			}
428 			return err;
429 		}
430 
431 		core->core_index = core_num++;
432 		bus->nr_cores++;
433 		other_core = bcma_find_core_reverse(bus, core->id.id);
434 		core->core_unit = (other_core == NULL) ? 0 : other_core->core_unit + 1;
435 
436 		pr_info("Core %d found: %s "
437 			"(manuf 0x%03X, id 0x%03X, rev 0x%02X, class 0x%X)\n",
438 			core->core_index, bcma_device_name(&core->id),
439 			core->id.manuf, core->id.id, core->id.rev,
440 			core->id.class);
441 
442 		list_add(&core->list, &bus->cores);
443 	}
444 
445 	if (bus->hosttype == BCMA_HOSTTYPE_SOC)
446 		iounmap(eromptr);
447 
448 	return 0;
449 }
450 
451 int __init bcma_bus_scan_early(struct bcma_bus *bus,
452 			       struct bcma_device_id *match,
453 			       struct bcma_device *core)
454 {
455 	u32 erombase;
456 	u32 __iomem *eromptr, *eromend;
457 
458 	int err = -ENODEV;
459 	int core_num = 0;
460 
461 	erombase = bcma_scan_read32(bus, 0, BCMA_CC_EROM);
462 	if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
463 		eromptr = ioremap_nocache(erombase, BCMA_CORE_SIZE);
464 		if (!eromptr)
465 			return -ENOMEM;
466 	} else {
467 		eromptr = bus->mmio;
468 	}
469 
470 	eromend = eromptr + BCMA_CORE_SIZE / sizeof(u32);
471 
472 	bcma_scan_switch_core(bus, erombase);
473 
474 	while (eromptr < eromend) {
475 		memset(core, 0, sizeof(*core));
476 		INIT_LIST_HEAD(&core->list);
477 		core->bus = bus;
478 
479 		err = bcma_get_next_core(bus, &eromptr, match, core_num, core);
480 		if (err == -ENODEV) {
481 			core_num++;
482 			continue;
483 		} else if (err == -ENXIO)
484 			continue;
485 		else if (err == -ESPIPE)
486 			break;
487 		else if (err < 0)
488 			return err;
489 
490 		core->core_index = core_num++;
491 		bus->nr_cores++;
492 		pr_info("Core %d found: %s "
493 			"(manuf 0x%03X, id 0x%03X, rev 0x%02X, class 0x%X)\n",
494 			core->core_index, bcma_device_name(&core->id),
495 			core->id.manuf, core->id.id, core->id.rev,
496 			core->id.class);
497 
498 		list_add(&core->list, &bus->cores);
499 		err = 0;
500 		break;
501 	}
502 
503 	if (bus->hosttype == BCMA_HOSTTYPE_SOC)
504 		iounmap(eromptr);
505 
506 	return err;
507 }
508