xref: /openbmc/linux/drivers/ssb/scan.c (revision 77a0989b)
1 /*
2  * Sonics Silicon Backplane
3  * Bus scanning
4  *
5  * Copyright (C) 2005-2007 Michael Buesch <m@bues.ch>
6  * Copyright (C) 2005 Martin Langer <martin-langer@gmx.de>
7  * Copyright (C) 2005 Stefano Brivio <st3@riseup.net>
8  * Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>
9  * Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
10  * Copyright (C) 2006 Broadcom Corporation.
11  *
12  * Licensed under the GNU/GPL. See COPYING for details.
13  */
14 
15 #include "ssb_private.h"
16 
17 #include <linux/ssb/ssb.h>
18 #include <linux/ssb/ssb_regs.h>
19 #include <linux/pci.h>
20 #include <linux/io.h>
21 
22 #include <pcmcia/cistpl.h>
23 #include <pcmcia/ds.h>
24 
25 
ssb_core_name(u16 coreid)26 const char *ssb_core_name(u16 coreid)
27 {
28 	switch (coreid) {
29 	case SSB_DEV_CHIPCOMMON:
30 		return "ChipCommon";
31 	case SSB_DEV_ILINE20:
32 		return "ILine 20";
33 	case SSB_DEV_SDRAM:
34 		return "SDRAM";
35 	case SSB_DEV_PCI:
36 		return "PCI";
37 	case SSB_DEV_MIPS:
38 		return "MIPS";
39 	case SSB_DEV_ETHERNET:
40 		return "Fast Ethernet";
41 	case SSB_DEV_V90:
42 		return "V90";
43 	case SSB_DEV_USB11_HOSTDEV:
44 		return "USB 1.1 Hostdev";
45 	case SSB_DEV_ADSL:
46 		return "ADSL";
47 	case SSB_DEV_ILINE100:
48 		return "ILine 100";
49 	case SSB_DEV_IPSEC:
50 		return "IPSEC";
51 	case SSB_DEV_PCMCIA:
52 		return "PCMCIA";
53 	case SSB_DEV_INTERNAL_MEM:
54 		return "Internal Memory";
55 	case SSB_DEV_MEMC_SDRAM:
56 		return "MEMC SDRAM";
57 	case SSB_DEV_EXTIF:
58 		return "EXTIF";
59 	case SSB_DEV_80211:
60 		return "IEEE 802.11";
61 	case SSB_DEV_MIPS_3302:
62 		return "MIPS 3302";
63 	case SSB_DEV_USB11_HOST:
64 		return "USB 1.1 Host";
65 	case SSB_DEV_USB11_DEV:
66 		return "USB 1.1 Device";
67 	case SSB_DEV_USB20_HOST:
68 		return "USB 2.0 Host";
69 	case SSB_DEV_USB20_DEV:
70 		return "USB 2.0 Device";
71 	case SSB_DEV_SDIO_HOST:
72 		return "SDIO Host";
73 	case SSB_DEV_ROBOSWITCH:
74 		return "Roboswitch";
75 	case SSB_DEV_PARA_ATA:
76 		return "PATA";
77 	case SSB_DEV_SATA_XORDMA:
78 		return "SATA XOR-DMA";
79 	case SSB_DEV_ETHERNET_GBIT:
80 		return "GBit Ethernet";
81 	case SSB_DEV_PCIE:
82 		return "PCI-E";
83 	case SSB_DEV_MIMO_PHY:
84 		return "MIMO PHY";
85 	case SSB_DEV_SRAM_CTRLR:
86 		return "SRAM Controller";
87 	case SSB_DEV_MINI_MACPHY:
88 		return "Mini MACPHY";
89 	case SSB_DEV_ARM_1176:
90 		return "ARM 1176";
91 	case SSB_DEV_ARM_7TDMI:
92 		return "ARM 7TDMI";
93 	case SSB_DEV_ARM_CM3:
94 		return "ARM Cortex M3";
95 	}
96 	return "UNKNOWN";
97 }
98 
pcidev_to_chipid(struct pci_dev * pci_dev)99 static u16 pcidev_to_chipid(struct pci_dev *pci_dev)
100 {
101 	u16 chipid_fallback = 0;
102 
103 	switch (pci_dev->device) {
104 	case 0x4301:
105 		chipid_fallback = 0x4301;
106 		break;
107 	case 0x4305 ... 0x4307:
108 		chipid_fallback = 0x4307;
109 		break;
110 	case 0x4403:
111 		chipid_fallback = 0x4402;
112 		break;
113 	case 0x4610 ... 0x4615:
114 		chipid_fallback = 0x4610;
115 		break;
116 	case 0x4710 ... 0x4715:
117 		chipid_fallback = 0x4710;
118 		break;
119 	case 0x4320 ... 0x4325:
120 		chipid_fallback = 0x4309;
121 		break;
122 	case PCI_DEVICE_ID_BCM4401:
123 	case PCI_DEVICE_ID_BCM4401B0:
124 	case PCI_DEVICE_ID_BCM4401B1:
125 		chipid_fallback = 0x4401;
126 		break;
127 	default:
128 		dev_err(&pci_dev->dev, "PCI-ID not in fallback list\n");
129 	}
130 
131 	return chipid_fallback;
132 }
133 
chipid_to_nrcores(u16 chipid)134 static u8 chipid_to_nrcores(u16 chipid)
135 {
136 	switch (chipid) {
137 	case 0x5365:
138 		return 7;
139 	case 0x4306:
140 		return 6;
141 	case 0x4310:
142 		return 8;
143 	case 0x4307:
144 	case 0x4301:
145 		return 5;
146 	case 0x4401:
147 	case 0x4402:
148 		return 3;
149 	case 0x4710:
150 	case 0x4610:
151 	case 0x4704:
152 		return 9;
153 	default:
154 		pr_err("CHIPID not in nrcores fallback list\n");
155 	}
156 
157 	return 1;
158 }
159 
scan_read32(struct ssb_bus * bus,u8 current_coreidx,u16 offset)160 static u32 scan_read32(struct ssb_bus *bus, u8 current_coreidx,
161 		       u16 offset)
162 {
163 	u32 lo, hi;
164 
165 	switch (bus->bustype) {
166 	case SSB_BUSTYPE_SSB:
167 		offset += current_coreidx * SSB_CORE_SIZE;
168 		break;
169 	case SSB_BUSTYPE_PCI:
170 		break;
171 	case SSB_BUSTYPE_PCMCIA:
172 		if (offset >= 0x800) {
173 			ssb_pcmcia_switch_segment(bus, 1);
174 			offset -= 0x800;
175 		} else
176 			ssb_pcmcia_switch_segment(bus, 0);
177 		lo = readw(bus->mmio + offset);
178 		hi = readw(bus->mmio + offset + 2);
179 		return lo | (hi << 16);
180 	case SSB_BUSTYPE_SDIO:
181 		offset += current_coreidx * SSB_CORE_SIZE;
182 		return ssb_sdio_scan_read32(bus, offset);
183 	}
184 	return readl(bus->mmio + offset);
185 }
186 
scan_switchcore(struct ssb_bus * bus,u8 coreidx)187 static int scan_switchcore(struct ssb_bus *bus, u8 coreidx)
188 {
189 	switch (bus->bustype) {
190 	case SSB_BUSTYPE_SSB:
191 		break;
192 	case SSB_BUSTYPE_PCI:
193 		return ssb_pci_switch_coreidx(bus, coreidx);
194 	case SSB_BUSTYPE_PCMCIA:
195 		return ssb_pcmcia_switch_coreidx(bus, coreidx);
196 	case SSB_BUSTYPE_SDIO:
197 		return ssb_sdio_scan_switch_coreidx(bus, coreidx);
198 	}
199 	return 0;
200 }
201 
ssb_iounmap(struct ssb_bus * bus)202 void ssb_iounmap(struct ssb_bus *bus)
203 {
204 	switch (bus->bustype) {
205 	case SSB_BUSTYPE_SSB:
206 	case SSB_BUSTYPE_PCMCIA:
207 		iounmap(bus->mmio);
208 		break;
209 	case SSB_BUSTYPE_PCI:
210 #ifdef CONFIG_SSB_PCIHOST
211 		pci_iounmap(bus->host_pci, bus->mmio);
212 #else
213 		WARN_ON(1); /* Can't reach this code. */
214 #endif
215 		break;
216 	case SSB_BUSTYPE_SDIO:
217 		break;
218 	}
219 	bus->mmio = NULL;
220 	bus->mapped_device = NULL;
221 }
222 
ssb_ioremap(struct ssb_bus * bus,unsigned long baseaddr)223 static void __iomem *ssb_ioremap(struct ssb_bus *bus,
224 				 unsigned long baseaddr)
225 {
226 	void __iomem *mmio = NULL;
227 
228 	switch (bus->bustype) {
229 	case SSB_BUSTYPE_SSB:
230 		/* Only map the first core for now. */
231 		fallthrough;
232 	case SSB_BUSTYPE_PCMCIA:
233 		mmio = ioremap(baseaddr, SSB_CORE_SIZE);
234 		break;
235 	case SSB_BUSTYPE_PCI:
236 #ifdef CONFIG_SSB_PCIHOST
237 		mmio = pci_iomap(bus->host_pci, 0, ~0UL);
238 #else
239 		WARN_ON(1); /* Can't reach this code. */
240 #endif
241 		break;
242 	case SSB_BUSTYPE_SDIO:
243 		/* Nothing to ioremap in the SDIO case, just fake it */
244 		mmio = (void __iomem *)baseaddr;
245 		break;
246 	}
247 
248 	return mmio;
249 }
250 
we_support_multiple_80211_cores(struct ssb_bus * bus)251 static int we_support_multiple_80211_cores(struct ssb_bus *bus)
252 {
253 	/* More than one 802.11 core is only supported by special chips.
254 	 * There are chips with two 802.11 cores, but with dangling
255 	 * pins on the second core. Be careful and reject them here.
256 	 */
257 
258 #ifdef CONFIG_SSB_PCIHOST
259 	if (bus->bustype == SSB_BUSTYPE_PCI) {
260 		if (bus->host_pci->vendor == PCI_VENDOR_ID_BROADCOM &&
261 		    ((bus->host_pci->device == 0x4313) ||
262 		     (bus->host_pci->device == 0x431A) ||
263 		     (bus->host_pci->device == 0x4321) ||
264 		     (bus->host_pci->device == 0x4324)))
265 			return 1;
266 	}
267 #endif /* CONFIG_SSB_PCIHOST */
268 	return 0;
269 }
270 
ssb_bus_scan(struct ssb_bus * bus,unsigned long baseaddr)271 int ssb_bus_scan(struct ssb_bus *bus,
272 		 unsigned long baseaddr)
273 {
274 	int err = -ENOMEM;
275 	void __iomem *mmio;
276 	u32 idhi, cc, rev, tmp;
277 	int dev_i, i;
278 	struct ssb_device *dev;
279 	int nr_80211_cores = 0;
280 
281 	mmio = ssb_ioremap(bus, baseaddr);
282 	if (!mmio)
283 		goto out;
284 	bus->mmio = mmio;
285 
286 	err = scan_switchcore(bus, 0); /* Switch to first core */
287 	if (err)
288 		goto err_unmap;
289 
290 	idhi = scan_read32(bus, 0, SSB_IDHIGH);
291 	cc = (idhi & SSB_IDHIGH_CC) >> SSB_IDHIGH_CC_SHIFT;
292 	rev = (idhi & SSB_IDHIGH_RCLO);
293 	rev |= (idhi & SSB_IDHIGH_RCHI) >> SSB_IDHIGH_RCHI_SHIFT;
294 
295 	bus->nr_devices = 0;
296 	if (cc == SSB_DEV_CHIPCOMMON) {
297 		tmp = scan_read32(bus, 0, SSB_CHIPCO_CHIPID);
298 
299 		bus->chip_id = (tmp & SSB_CHIPCO_IDMASK);
300 		bus->chip_rev = (tmp & SSB_CHIPCO_REVMASK) >>
301 				SSB_CHIPCO_REVSHIFT;
302 		bus->chip_package = (tmp & SSB_CHIPCO_PACKMASK) >>
303 				    SSB_CHIPCO_PACKSHIFT;
304 		if (rev >= 4) {
305 			bus->nr_devices = (tmp & SSB_CHIPCO_NRCORESMASK) >>
306 					  SSB_CHIPCO_NRCORESSHIFT;
307 		}
308 		tmp = scan_read32(bus, 0, SSB_CHIPCO_CAP);
309 		bus->chipco.capabilities = tmp;
310 	} else {
311 		if (bus->bustype == SSB_BUSTYPE_PCI) {
312 			bus->chip_id = pcidev_to_chipid(bus->host_pci);
313 			bus->chip_rev = bus->host_pci->revision;
314 			bus->chip_package = 0;
315 		} else {
316 			bus->chip_id = 0x4710;
317 			bus->chip_rev = 0;
318 			bus->chip_package = 0;
319 		}
320 	}
321 	pr_info("Found chip with id 0x%04X, rev 0x%02X and package 0x%02X\n",
322 		bus->chip_id, bus->chip_rev, bus->chip_package);
323 	if (!bus->nr_devices)
324 		bus->nr_devices = chipid_to_nrcores(bus->chip_id);
325 	if (bus->nr_devices > ARRAY_SIZE(bus->devices)) {
326 		pr_err("More than %d ssb cores found (%d)\n",
327 		       SSB_MAX_NR_CORES, bus->nr_devices);
328 		err = -EINVAL;
329 		goto err_unmap;
330 	}
331 	if (bus->bustype == SSB_BUSTYPE_SSB) {
332 		/* Now that we know the number of cores,
333 		 * remap the whole IO space for all cores.
334 		 */
335 		err = -ENOMEM;
336 		iounmap(mmio);
337 		mmio = ioremap(baseaddr, SSB_CORE_SIZE * bus->nr_devices);
338 		if (!mmio)
339 			goto out;
340 		bus->mmio = mmio;
341 	}
342 
343 	/* Fetch basic information about each core/device */
344 	for (i = 0, dev_i = 0; i < bus->nr_devices; i++) {
345 		err = scan_switchcore(bus, i);
346 		if (err)
347 			goto err_unmap;
348 		dev = &(bus->devices[dev_i]);
349 
350 		idhi = scan_read32(bus, i, SSB_IDHIGH);
351 		dev->id.coreid = (idhi & SSB_IDHIGH_CC) >> SSB_IDHIGH_CC_SHIFT;
352 		dev->id.revision = (idhi & SSB_IDHIGH_RCLO);
353 		dev->id.revision |= (idhi & SSB_IDHIGH_RCHI) >> SSB_IDHIGH_RCHI_SHIFT;
354 		dev->id.vendor = (idhi & SSB_IDHIGH_VC) >> SSB_IDHIGH_VC_SHIFT;
355 		dev->core_index = i;
356 		dev->bus = bus;
357 		dev->ops = bus->ops;
358 
359 		pr_debug("Core %d found: %s (cc 0x%03X, rev 0x%02X, vendor 0x%04X)\n",
360 			 i, ssb_core_name(dev->id.coreid),
361 			 dev->id.coreid, dev->id.revision, dev->id.vendor);
362 
363 		switch (dev->id.coreid) {
364 		case SSB_DEV_80211:
365 			nr_80211_cores++;
366 			if (nr_80211_cores > 1) {
367 				if (!we_support_multiple_80211_cores(bus)) {
368 					pr_debug("Ignoring additional 802.11 core\n");
369 					continue;
370 				}
371 			}
372 			break;
373 		case SSB_DEV_EXTIF:
374 #ifdef CONFIG_SSB_DRIVER_EXTIF
375 			if (bus->extif.dev) {
376 				pr_warn("WARNING: Multiple EXTIFs found\n");
377 				break;
378 			}
379 			bus->extif.dev = dev;
380 #endif /* CONFIG_SSB_DRIVER_EXTIF */
381 			break;
382 		case SSB_DEV_CHIPCOMMON:
383 			if (bus->chipco.dev) {
384 				pr_warn("WARNING: Multiple ChipCommon found\n");
385 				break;
386 			}
387 			bus->chipco.dev = dev;
388 			break;
389 		case SSB_DEV_MIPS:
390 		case SSB_DEV_MIPS_3302:
391 #ifdef CONFIG_SSB_DRIVER_MIPS
392 			if (bus->mipscore.dev) {
393 				pr_warn("WARNING: Multiple MIPS cores found\n");
394 				break;
395 			}
396 			bus->mipscore.dev = dev;
397 #endif /* CONFIG_SSB_DRIVER_MIPS */
398 			break;
399 		case SSB_DEV_PCI:
400 		case SSB_DEV_PCIE:
401 #ifdef CONFIG_SSB_DRIVER_PCICORE
402 			if (bus->bustype == SSB_BUSTYPE_PCI) {
403 				/* Ignore PCI cores on PCI-E cards.
404 				 * Ignore PCI-E cores on PCI cards.
405 				 */
406 				if (dev->id.coreid == SSB_DEV_PCI) {
407 					if (pci_is_pcie(bus->host_pci))
408 						continue;
409 				} else {
410 					if (!pci_is_pcie(bus->host_pci))
411 						continue;
412 				}
413 			}
414 			if (bus->pcicore.dev) {
415 				pr_warn("WARNING: Multiple PCI(E) cores found\n");
416 				break;
417 			}
418 			bus->pcicore.dev = dev;
419 #endif /* CONFIG_SSB_DRIVER_PCICORE */
420 			break;
421 		case SSB_DEV_ETHERNET:
422 			if (bus->bustype == SSB_BUSTYPE_PCI) {
423 				if (bus->host_pci->vendor == PCI_VENDOR_ID_BROADCOM &&
424 				    (bus->host_pci->device & 0xFF00) == 0x4300) {
425 					/* This is a dangling ethernet core on a
426 					 * wireless device. Ignore it.
427 					 */
428 					continue;
429 				}
430 			}
431 			break;
432 		default:
433 			break;
434 		}
435 
436 		dev_i++;
437 	}
438 	bus->nr_devices = dev_i;
439 
440 	err = 0;
441 out:
442 	return err;
443 err_unmap:
444 	ssb_iounmap(bus);
445 	goto out;
446 }
447