summaryrefslogtreecommitdiff
path: root/arch/ia64/sn/kernel/io_acpi_init.c
blob: 231234c8d1133a8e593b2c5312cdb95141ecc4c6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2006 Silicon Graphics, Inc. All rights reserved.
 */

#include <asm/sn/types.h>
#include <asm/sn/addrs.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/sn_sal.h>
#include "xtalk/hubdev.h"
#include <linux/acpi.h>
#include <linux/slab.h>
#include <linux/export.h>


/*
 * The code in this file will only be executed when running with
 * a PROM that has ACPI IO support. (i.e., SN_ACPI_BASE_SUPPORT() == 1)
 */


/*
 * This value must match the UUID the PROM uses
 * (io/acpi/defblk.c) when building a vendor descriptor.
 */
struct acpi_vendor_uuid sn_uuid = {
	.subtype = 0,
	.data	= { 0x2c, 0xc6, 0xa6, 0xfe, 0x9c, 0x44, 0xda, 0x11,
		    0xa2, 0x7c, 0x08, 0x00, 0x69, 0x13, 0xea, 0x51 },
};

struct sn_pcidev_match {
	u8 bus;
	unsigned int devfn;
	acpi_handle handle;
};

/*
 * Perform the early IO init in PROM.
 */
static long
sal_ioif_init(u64 *result)
{
	struct ia64_sal_retval isrv = {0,0,0,0};

	SAL_CALL_NOLOCK(isrv,
			SN_SAL_IOIF_INIT, 0, 0, 0, 0, 0, 0, 0);
	*result = isrv.v0;
	return isrv.status;
}

/*
 * sn_acpi_hubdev_init() - This function is called by acpi_ns_get_device_callback()
 *			   for all SGIHUB and SGITIO acpi devices defined in the
 *			   DSDT. It obtains the hubdev_info pointer from the
 *			   ACPI vendor resource, which the PROM setup, and sets up the
 *			   hubdev_info in the pda.
 */

static acpi_status __init
sn_acpi_hubdev_init(acpi_handle handle, u32 depth, void *context, void **ret)
{
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	u64 addr;
	struct hubdev_info *hubdev;
	struct hubdev_info *hubdev_ptr;
	int i;
	u64 nasid;
	struct acpi_resource *resource;
	acpi_status status;
	struct acpi_resource_vendor_typed *vendor;
	extern void sn_common_hubdev_init(struct hubdev_info *);

	status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
					  &sn_uuid, &buffer);
	if (ACPI_FAILURE(status)) {
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
		printk(KERN_ERR
		       "sn_acpi_hubdev_init: acpi_get_vendor_resource() "
		       "(0x%x) failed for: %s\n", status,
			(char *)name_buffer.pointer);
		kfree(name_buffer.pointer);
		return AE_OK;		/* Continue walking namespace */
	}

	resource = buffer.pointer;
	vendor = &resource->data.vendor_typed;
	if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
	    sizeof(struct hubdev_info *)) {
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
		printk(KERN_ERR
		       "sn_acpi_hubdev_init: Invalid vendor data length: "
		       "%d for: %s\n",
			vendor->byte_length, (char *)name_buffer.pointer);
		kfree(name_buffer.pointer);
		goto exit;
	}

	memcpy(&addr, vendor->byte_data, sizeof(struct hubdev_info *));
	hubdev_ptr = __va((struct hubdev_info *) addr);

	nasid = hubdev_ptr->hdi_nasid;
	i = nasid_to_cnodeid(nasid);
	hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
	*hubdev = *hubdev_ptr;
	sn_common_hubdev_init(hubdev);

exit:
	kfree(buffer.pointer);
	return AE_OK;		/* Continue walking namespace */
}

/*
 * sn_get_bussoft_ptr() - The pcibus_bussoft pointer is found in
 *			  the ACPI Vendor resource for this bus.
 */
static struct pcibus_bussoft *
sn_get_bussoft_ptr(struct pci_bus *bus)
{
	u64 addr;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	acpi_handle handle;
	struct pcibus_bussoft *prom_bussoft_ptr;
	struct acpi_resource *resource;
	acpi_status status;
	struct acpi_resource_vendor_typed *vendor;


	handle = acpi_device_handle(PCI_CONTROLLER(bus)->companion);
	status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
					  &sn_uuid, &buffer);
	if (ACPI_FAILURE(status)) {
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
		printk(KERN_ERR "%s: "
		       "acpi_get_vendor_resource() failed (0x%x) for: %s\n",
		       __func__, status, (char *)name_buffer.pointer);
		kfree(name_buffer.pointer);
		return NULL;
	}
	resource = buffer.pointer;
	vendor = &resource->data.vendor_typed;

	if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
	     sizeof(struct pcibus_bussoft *)) {
		printk(KERN_ERR
		       "%s: Invalid vendor data length %d\n",
			__func__, vendor->byte_length);
		kfree(buffer.pointer);
		return NULL;
	}
	memcpy(&addr, vendor->byte_data, sizeof(struct pcibus_bussoft *));
	prom_bussoft_ptr = __va((struct pcibus_bussoft *) addr);
	kfree(buffer.pointer);

	return prom_bussoft_ptr;
}

/*
 * sn_extract_device_info - Extract the pcidev_info and the sn_irq_info
 *			    pointers from the vendor resource using the
 *			    provided acpi handle, and copy the structures
 *			    into the argument buffers.
 */
static int
sn_extract_device_info(acpi_handle handle, struct pcidev_info **pcidev_info,
		    struct sn_irq_info **sn_irq_info)
{
	u64 addr;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	struct sn_irq_info *irq_info, *irq_info_prom;
	struct pcidev_info *pcidev_ptr, *pcidev_prom_ptr;
	struct acpi_resource *resource;
	int ret = 0;
	acpi_status status;
	struct acpi_resource_vendor_typed *vendor;

	/*
	 * The pointer to this device's pcidev_info structure in
	 * the PROM, is in the vendor resource.
	 */
	status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
					  &sn_uuid, &buffer);
	if (ACPI_FAILURE(status)) {
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
		printk(KERN_ERR
		       "%s: acpi_get_vendor_resource() failed (0x%x) for: %s\n",
			__func__, status, (char *)name_buffer.pointer);
		kfree(name_buffer.pointer);
		return 1;
	}

	resource = buffer.pointer;
	vendor = &resource->data.vendor_typed;
	if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
	    sizeof(struct pci_devdev_info *)) {
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
		printk(KERN_ERR
		       "%s: Invalid vendor data length: %d for: %s\n",
			 __func__, vendor->byte_length,
			(char *)name_buffer.pointer);
		kfree(name_buffer.pointer);
		ret = 1;
		goto exit;
	}

	pcidev_ptr = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
	if (!pcidev_ptr)
		panic("%s: Unable to alloc memory for pcidev_info", __func__);

	memcpy(&addr, vendor->byte_data, sizeof(struct pcidev_info *));
	pcidev_prom_ptr = __va(addr);
	memcpy(pcidev_ptr, pcidev_prom_ptr, sizeof(struct pcidev_info));

	/* Get the IRQ info */
	irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
	if (!irq_info)
		 panic("%s: Unable to alloc memory for sn_irq_info", __func__);

	if (pcidev_ptr->pdi_sn_irq_info) {
		irq_info_prom = __va(pcidev_ptr->pdi_sn_irq_info);
		memcpy(irq_info, irq_info_prom, sizeof(struct sn_irq_info));
	}

	*pcidev_info = pcidev_ptr;
	*sn_irq_info = irq_info;

exit:
	kfree(buffer.pointer);
	return ret;
}

static unsigned int
get_host_devfn(acpi_handle device_handle, acpi_handle rootbus_handle)
{
	unsigned long long adr;
	acpi_handle child;
	unsigned int devfn;
	int function;
	acpi_handle parent;
	int slot;
	acpi_status status;
	struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };

	acpi_get_name(device_handle, ACPI_FULL_PATHNAME, &name_buffer);

	/*
	 * Do an upward search to find the root bus device, and
	 * obtain the host devfn from the previous child device.
	 */
	child = device_handle;
	while (child) {
		status = acpi_get_parent(child, &parent);
		if (ACPI_FAILURE(status)) {
			printk(KERN_ERR "%s: acpi_get_parent() failed "
			       "(0x%x) for: %s\n", __func__, status,
				(char *)name_buffer.pointer);
			panic("%s: Unable to find host devfn\n", __func__);
		}
		if (parent == rootbus_handle)
			break;
		child = parent;
	}
	if (!child) {
		printk(KERN_ERR "%s: Unable to find root bus for: %s\n",
		       __func__, (char *)name_buffer.pointer);
		BUG();
	}

	status = acpi_evaluate_integer(child, METHOD_NAME__ADR, NULL, &adr);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR "%s: Unable to get _ADR (0x%x) for: %s\n",
		       __func__, status, (char *)name_buffer.pointer);
		panic("%s: Unable to find host devfn\n", __func__);
	}

	kfree(name_buffer.pointer);

	slot = (adr >> 16) & 0xffff;
	function = adr & 0xffff;
	devfn = PCI_DEVFN(slot, function);
	return devfn;
}

/*
 * find_matching_device - Callback routine to find the ACPI device
 *			  that matches up with our pci_dev device.
 *			  Matching is done on bus number and devfn.
 *			  To find the bus number for a particular
 *			  ACPI device, we must look at the _BBN method
 *			  of its parent.
 */
static acpi_status
find_matching_device(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	unsigned long long bbn = -1;
	unsigned long long adr;
	acpi_handle parent = NULL;
	acpi_status status;
	unsigned int devfn;
	int function;
	int slot;
	struct sn_pcidev_match *info = context;
	struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };

        status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
                                       &adr);
        if (ACPI_SUCCESS(status)) {
		status = acpi_get_parent(handle, &parent);
		if (ACPI_FAILURE(status)) {
			acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
			printk(KERN_ERR
			       "%s: acpi_get_parent() failed (0x%x) for: %s\n",
				__func__, status, (char *)name_buffer.pointer);
			kfree(name_buffer.pointer);
			return AE_OK;
		}
		status = acpi_evaluate_integer(parent, METHOD_NAME__BBN,
					       NULL, &bbn);
		if (ACPI_FAILURE(status)) {
			acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
			printk(KERN_ERR
			  "%s: Failed to find _BBN in parent of: %s\n",
					__func__, (char *)name_buffer.pointer);
			kfree(name_buffer.pointer);
			return AE_OK;
		}

                slot = (adr >> 16) & 0xffff;
                function = adr & 0xffff;
                devfn = PCI_DEVFN(slot, function);
                if ((info->devfn == devfn) && (info->bus == bbn)) {
			/* We have a match! */
			info->handle = handle;
			return 1;
		}
	}
	return AE_OK;
}

/*
 * sn_acpi_get_pcidev_info - Search ACPI namespace for the acpi
 *			     device matching the specified pci_dev,
 *			     and return the pcidev info and irq info.
 */
int
sn_acpi_get_pcidev_info(struct pci_dev *dev, struct pcidev_info **pcidev_info,
			struct sn_irq_info **sn_irq_info)
{
	unsigned int host_devfn;
	struct sn_pcidev_match pcidev_match;
	acpi_handle rootbus_handle;
	unsigned long long segment;
	acpi_status status;
	struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };

	rootbus_handle = acpi_device_handle(PCI_CONTROLLER(dev)->companion);
        status = acpi_evaluate_integer(rootbus_handle, METHOD_NAME__SEG, NULL,
                                       &segment);
        if (ACPI_SUCCESS(status)) {
		if (segment != pci_domain_nr(dev)) {
			acpi_get_name(rootbus_handle, ACPI_FULL_PATHNAME,
				&name_buffer);
			printk(KERN_ERR
			       "%s: Segment number mismatch, 0x%llx vs 0x%x for: %s\n",
			       __func__, segment, pci_domain_nr(dev),
			       (char *)name_buffer.pointer);
			kfree(name_buffer.pointer);
			return 1;
		}
	} else {
		acpi_get_name(rootbus_handle, ACPI_FULL_PATHNAME, &name_buffer);
		printk(KERN_ERR "%s: Unable to get __SEG from: %s\n",
		       __func__, (char *)name_buffer.pointer);
		kfree(name_buffer.pointer);
		return 1;
	}

	/*
	 * We want to search all devices in this segment/domain
	 * of the ACPI namespace for the matching ACPI device,
	 * which holds the pcidev_info pointer in its vendor resource.
	 */
	pcidev_match.bus = dev->bus->number;
	pcidev_match.devfn = dev->devfn;
	pcidev_match.handle = NULL;

	acpi_walk_namespace(ACPI_TYPE_DEVICE, rootbus_handle, ACPI_UINT32_MAX,
			    find_matching_device, NULL, &pcidev_match, NULL);

	if (!pcidev_match.handle) {
		printk(KERN_ERR
		       "%s: Could not find matching ACPI device for %s.\n",
		       __func__, pci_name(dev));
		return 1;
	}

	if (sn_extract_device_info(pcidev_match.handle, pcidev_info, sn_irq_info))
		return 1;

	/* Build up the pcidev_info.pdi_slot_host_handle */
	host_devfn = get_host_devfn(pcidev_match.handle, rootbus_handle);
	(*pcidev_info)->pdi_slot_host_handle =
			((unsigned long) pci_domain_nr(dev) << 40) |
					/* bus == 0 */
					host_devfn;
	return 0;
}

/*
 * sn_acpi_slot_fixup - Obtain the pcidev_info and sn_irq_info.
 *			Perform any SN specific slot fixup.
 *			At present there does not appear to be
 *			any generic way to handle a ROM image
 *			that has been shadowed by the PROM, so
 *			we pass a pointer to it	within the
 *			pcidev_info structure.
 */

void
sn_acpi_slot_fixup(struct pci_dev *dev)
{
	void __iomem *addr;
	struct pcidev_info *pcidev_info = NULL;
	struct sn_irq_info *sn_irq_info = NULL;
	struct resource *res;
	size_t size;

	if (sn_acpi_get_pcidev_info(dev, &pcidev_info, &sn_irq_info)) {
		panic("%s:  Failure obtaining pcidev_info for %s\n",
		      __func__, pci_name(dev));
	}

	if (pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE]) {
		/*
		 * A valid ROM image exists and has been shadowed by the
		 * PROM. Setup the pci_dev ROM resource with the address
		 * of the shadowed copy, and the actual length of the ROM image.
		 */
		size = pci_resource_len(dev, PCI_ROM_RESOURCE);

		res = &dev->resource[PCI_ROM_RESOURCE];

		pci_disable_rom(dev);
		if (res->parent)
			release_resource(res);

		res->start = pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE];
		res->end = res->start + size - 1;
		res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
			     IORESOURCE_PCI_FIXED;
	}
	sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
}
EXPORT_SYMBOL(sn_acpi_slot_fixup);


/*
 * sn_acpi_bus_fixup -  Perform SN specific setup of software structs
 *			(pcibus_bussoft, pcidev_info) and hardware
 *			registers, for the specified bus and devices under it.
 */
void
sn_acpi_bus_fixup(struct pci_bus *bus)
{
	struct pci_dev *pci_dev = NULL;
	struct pcibus_bussoft *prom_bussoft_ptr;

	if (!bus->parent) {	/* If root bus */
		prom_bussoft_ptr = sn_get_bussoft_ptr(bus);
		if (prom_bussoft_ptr == NULL) {
			printk(KERN_ERR
			       "%s: 0x%04x:0x%02x Unable to "
			       "obtain prom_bussoft_ptr\n",
			       __func__, pci_domain_nr(bus), bus->number);
			return;
		}
		sn_common_bus_fixup(bus, prom_bussoft_ptr);
	}
	list_for_each_entry(pci_dev, &bus->devices, bus_list) {
		sn_acpi_slot_fixup(pci_dev);
	}
}

/*
 * sn_io_acpi_init - PROM has ACPI support for IO, defining at a minimum the
 *		     nodes and root buses in the DSDT. As a result, bus scanning
 *		     will be initiated by the Linux ACPI code.
 */

void __init
sn_io_acpi_init(void)
{
	u64 result;
	long status;

	/* SN Altix does not follow the IOSAPIC IRQ routing model */
	acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;

	/* Setup hubdev_info for all SGIHUB/SGITIO devices */
	acpi_get_devices("SGIHUB", sn_acpi_hubdev_init, NULL, NULL);
	acpi_get_devices("SGITIO", sn_acpi_hubdev_init, NULL, NULL);

	status = sal_ioif_init(&result);
	if (status || result)
		panic("sal_ioif_init failed: [%lx] %s\n",
		      status, ia64_sal_strerror(status));
}