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/drivers/acpi/pci_irq.c

https://bitbucket.org/cresqo/cm7-p500-kernel
C | 472 lines | 322 code | 63 blank | 87 comment | 50 complexity | ee38c430c2f09fc6c32da9a7aeb41543 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  1/*
  2 *  pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
  3 *
  4 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  5 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  6 *  Copyright (C) 2002       Dominik Brodowski <devel@brodo.de>
  7 *  (c) Copyright 2008 Hewlett-Packard Development Company, L.P.
  8 *	Bjorn Helgaas <bjorn.helgaas@hp.com>
  9 *
 10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 11 *
 12 *  This program is free software; you can redistribute it and/or modify
 13 *  it under the terms of the GNU General Public License as published by
 14 *  the Free Software Foundation; either version 2 of the License, or (at
 15 *  your option) any later version.
 16 *
 17 *  This program is distributed in the hope that it will be useful, but
 18 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 19 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 20 *  General Public License for more details.
 21 *
 22 *  You should have received a copy of the GNU General Public License along
 23 *  with this program; if not, write to the Free Software Foundation, Inc.,
 24 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 25 *
 26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 27 */
 28
 29
 30#include <linux/dmi.h>
 31#include <linux/kernel.h>
 32#include <linux/module.h>
 33#include <linux/init.h>
 34#include <linux/types.h>
 35#include <linux/proc_fs.h>
 36#include <linux/spinlock.h>
 37#include <linux/pm.h>
 38#include <linux/pci.h>
 39#include <linux/acpi.h>
 40#include <linux/slab.h>
 41#include <acpi/acpi_bus.h>
 42#include <acpi/acpi_drivers.h>
 43
 44#define PREFIX "ACPI: "
 45
 46#define _COMPONENT		ACPI_PCI_COMPONENT
 47ACPI_MODULE_NAME("pci_irq");
 48
 49struct acpi_prt_entry {
 50	struct list_head	list;
 51	struct acpi_pci_id	id;
 52	u8			pin;
 53	acpi_handle		link;
 54	u32			index;		/* GSI, or link _CRS index */
 55};
 56
 57static LIST_HEAD(acpi_prt_list);
 58static DEFINE_SPINLOCK(acpi_prt_lock);
 59
 60static inline char pin_name(int pin)
 61{
 62	return 'A' + pin - 1;
 63}
 64
 65/* --------------------------------------------------------------------------
 66                         PCI IRQ Routing Table (PRT) Support
 67   -------------------------------------------------------------------------- */
 68
 69static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
 70							  int pin)
 71{
 72	struct acpi_prt_entry *entry;
 73	int segment = pci_domain_nr(dev->bus);
 74	int bus = dev->bus->number;
 75	int device = PCI_SLOT(dev->devfn);
 76
 77	spin_lock(&acpi_prt_lock);
 78	list_for_each_entry(entry, &acpi_prt_list, list) {
 79		if ((segment == entry->id.segment)
 80		    && (bus == entry->id.bus)
 81		    && (device == entry->id.device)
 82		    && (pin == entry->pin)) {
 83			spin_unlock(&acpi_prt_lock);
 84			return entry;
 85		}
 86	}
 87	spin_unlock(&acpi_prt_lock);
 88	return NULL;
 89}
 90
 91/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
 92static const struct dmi_system_id medion_md9580[] = {
 93	{
 94		.ident = "Medion MD9580-F laptop",
 95		.matches = {
 96			DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
 97			DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
 98		},
 99	},
100	{ }
101};
102
103/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
104static const struct dmi_system_id dell_optiplex[] = {
105	{
106		.ident = "Dell Optiplex GX1",
107		.matches = {
108			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
109			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
110		},
111	},
112	{ }
113};
114
115/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
116static const struct dmi_system_id hp_t5710[] = {
117	{
118		.ident = "HP t5710",
119		.matches = {
120			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
121			DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
122			DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
123		},
124	},
125	{ }
126};
127
128struct prt_quirk {
129	const struct dmi_system_id *system;
130	unsigned int		segment;
131	unsigned int		bus;
132	unsigned int		device;
133	unsigned char		pin;
134	const char		*source;	/* according to BIOS */
135	const char		*actual_source;
136};
137
138#define PCI_INTX_PIN(c)		(c - 'A' + 1)
139
140/*
141 * These systems have incorrect _PRT entries.  The BIOS claims the PCI
142 * interrupt at the listed segment/bus/device/pin is connected to the first
143 * link device, but it is actually connected to the second.
144 */
145static const struct prt_quirk prt_quirks[] = {
146	{ medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
147		"\\_SB_.PCI0.ISA_.LNKA",
148		"\\_SB_.PCI0.ISA_.LNKB"},
149	{ dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
150		"\\_SB_.LNKB",
151		"\\_SB_.LNKA"},
152	{ hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
153		"\\_SB_.PCI0.LNK1",
154		"\\_SB_.PCI0.LNK3"},
155};
156
157static void do_prt_fixups(struct acpi_prt_entry *entry,
158			  struct acpi_pci_routing_table *prt)
159{
160	int i;
161	const struct prt_quirk *quirk;
162
163	for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
164		quirk = &prt_quirks[i];
165
166		/* All current quirks involve link devices, not GSIs */
167		if (!prt->source)
168			continue;
169
170		if (dmi_check_system(quirk->system) &&
171		    entry->id.segment == quirk->segment &&
172		    entry->id.bus == quirk->bus &&
173		    entry->id.device == quirk->device &&
174		    entry->pin == quirk->pin &&
175		    !strcmp(prt->source, quirk->source) &&
176		    strlen(prt->source) >= strlen(quirk->actual_source)) {
177			printk(KERN_WARNING PREFIX "firmware reports "
178				"%04x:%02x:%02x PCI INT %c connected to %s; "
179				"changing to %s\n",
180				entry->id.segment, entry->id.bus,
181				entry->id.device, pin_name(entry->pin),
182				prt->source, quirk->actual_source);
183			strcpy(prt->source, quirk->actual_source);
184		}
185	}
186}
187
188static int acpi_pci_irq_add_entry(acpi_handle handle, struct pci_bus *bus,
189				  struct acpi_pci_routing_table *prt)
190{
191	struct acpi_prt_entry *entry;
192
193	entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
194	if (!entry)
195		return -ENOMEM;
196
197	/*
198	 * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
199	 * 1=INTA, 2=INTB.  We use the PCI encoding throughout, so convert
200	 * it here.
201	 */
202	entry->id.segment = pci_domain_nr(bus);
203	entry->id.bus = bus->number;
204	entry->id.device = (prt->address >> 16) & 0xFFFF;
205	entry->pin = prt->pin + 1;
206
207	do_prt_fixups(entry, prt);
208
209	entry->index = prt->source_index;
210
211	/*
212	 * Type 1: Dynamic
213	 * ---------------
214	 * The 'source' field specifies the PCI interrupt link device used to
215	 * configure the IRQ assigned to this slot|dev|pin.  The 'source_index'
216	 * indicates which resource descriptor in the resource template (of
217	 * the link device) this interrupt is allocated from.
218	 * 
219	 * NOTE: Don't query the Link Device for IRQ information at this time
220	 *       because Link Device enumeration may not have occurred yet
221	 *       (e.g. exists somewhere 'below' this _PRT entry in the ACPI
222	 *       namespace).
223	 */
224	if (prt->source[0])
225		acpi_get_handle(handle, prt->source, &entry->link);
226
227	/*
228	 * Type 2: Static
229	 * --------------
230	 * The 'source' field is NULL, and the 'source_index' field specifies
231	 * the IRQ value, which is hardwired to specific interrupt inputs on
232	 * the interrupt controller.
233	 */
234
235	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
236			      "      %04x:%02x:%02x[%c] -> %s[%d]\n",
237			      entry->id.segment, entry->id.bus,
238			      entry->id.device, pin_name(entry->pin),
239			      prt->source, entry->index));
240
241	spin_lock(&acpi_prt_lock);
242	list_add_tail(&entry->list, &acpi_prt_list);
243	spin_unlock(&acpi_prt_lock);
244
245	return 0;
246}
247
248int acpi_pci_irq_add_prt(acpi_handle handle, struct pci_bus *bus)
249{
250	acpi_status status;
251	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
252	struct acpi_pci_routing_table *entry;
253
254	/* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
255	status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
256	if (ACPI_FAILURE(status))
257		return -ENODEV;
258
259	printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
260	       (char *) buffer.pointer);
261
262	kfree(buffer.pointer);
263
264	buffer.length = ACPI_ALLOCATE_BUFFER;
265	buffer.pointer = NULL;
266
267	status = acpi_get_irq_routing_table(handle, &buffer);
268	if (ACPI_FAILURE(status)) {
269		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
270				acpi_format_exception(status)));
271		kfree(buffer.pointer);
272		return -ENODEV;
273	}
274
275	entry = buffer.pointer;
276	while (entry && (entry->length > 0)) {
277		acpi_pci_irq_add_entry(handle, bus, entry);
278		entry = (struct acpi_pci_routing_table *)
279		    ((unsigned long)entry + entry->length);
280	}
281
282	kfree(buffer.pointer);
283	return 0;
284}
285
286void acpi_pci_irq_del_prt(struct pci_bus *bus)
287{
288	struct acpi_prt_entry *entry, *tmp;
289
290	printk(KERN_DEBUG
291	       "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
292	       pci_domain_nr(bus), bus->number);
293	spin_lock(&acpi_prt_lock);
294	list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
295		if (pci_domain_nr(bus) == entry->id.segment
296			&& bus->number == entry->id.bus) {
297			list_del(&entry->list);
298			kfree(entry);
299		}
300	}
301	spin_unlock(&acpi_prt_lock);
302}
303
304/* --------------------------------------------------------------------------
305                          PCI Interrupt Routing Support
306   -------------------------------------------------------------------------- */
307static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
308{
309	struct acpi_prt_entry *entry;
310	struct pci_dev *bridge;
311	u8 bridge_pin, orig_pin = pin;
312
313	entry = acpi_pci_irq_find_prt_entry(dev, pin);
314	if (entry) {
315		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
316				  pci_name(dev), pin_name(pin)));
317		return entry;
318	}
319
320	/* 
321	 * Attempt to derive an IRQ for this device from a parent bridge's
322	 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
323	 */
324	bridge = dev->bus->self;
325	while (bridge) {
326		pin = pci_swizzle_interrupt_pin(dev, pin);
327
328		if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
329			/* PC card has the same IRQ as its cardbridge */
330			bridge_pin = bridge->pin;
331			if (!bridge_pin) {
332				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
333						  "No interrupt pin configured for device %s\n",
334						  pci_name(bridge)));
335				return NULL;
336			}
337			pin = bridge_pin;
338		}
339
340		entry = acpi_pci_irq_find_prt_entry(bridge, pin);
341		if (entry) {
342			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
343					 "Derived GSI for %s INT %c from %s\n",
344					 pci_name(dev), pin_name(orig_pin),
345					 pci_name(bridge)));
346			return entry;
347		}
348
349		dev = bridge;
350		bridge = dev->bus->self;
351	}
352
353	dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
354		 pin_name(orig_pin));
355	return NULL;
356}
357
358int acpi_pci_irq_enable(struct pci_dev *dev)
359{
360	struct acpi_prt_entry *entry;
361	int gsi;
362	u8 pin;
363	int triggering = ACPI_LEVEL_SENSITIVE;
364	int polarity = ACPI_ACTIVE_LOW;
365	char *link = NULL;
366	char link_desc[16];
367	int rc;
368
369	pin = dev->pin;
370	if (!pin) {
371		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
372				  "No interrupt pin configured for device %s\n",
373				  pci_name(dev)));
374		return 0;
375	}
376
377	entry = acpi_pci_irq_lookup(dev, pin);
378	if (!entry) {
379		/*
380		 * IDE legacy mode controller IRQs are magic. Why do compat
381		 * extensions always make such a nasty mess.
382		 */
383		if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
384				(dev->class & 0x05) == 0)
385			return 0;
386	}
387
388	if (entry) {
389		if (entry->link)
390			gsi = acpi_pci_link_allocate_irq(entry->link,
391							 entry->index,
392							 &triggering, &polarity,
393							 &link);
394		else
395			gsi = entry->index;
396	} else
397		gsi = -1;
398
399	/*
400	 * No IRQ known to the ACPI subsystem - maybe the BIOS / 
401	 * driver reported one, then use it. Exit in any case.
402	 */
403	if (gsi < 0) {
404		u32 dev_gsi;
405		dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
406		/* Interrupt Line values above 0xF are forbidden */
407		if (dev->irq > 0 && (dev->irq <= 0xF) &&
408		    (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
409			printk(" - using ISA IRQ %d\n", dev->irq);
410			acpi_register_gsi(&dev->dev, dev_gsi,
411					  ACPI_LEVEL_SENSITIVE,
412					  ACPI_ACTIVE_LOW);
413			return 0;
414		} else {
415			printk("\n");
416			return 0;
417		}
418	}
419
420	rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
421	if (rc < 0) {
422		dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
423			 pin_name(pin));
424		return rc;
425	}
426	dev->irq = rc;
427
428	if (link)
429		snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
430	else
431		link_desc[0] = '\0';
432
433	dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
434		 pin_name(pin), link_desc, gsi,
435		 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
436		 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
437
438	return 0;
439}
440
441/* FIXME: implement x86/x86_64 version */
442void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
443{
444}
445
446void acpi_pci_irq_disable(struct pci_dev *dev)
447{
448	struct acpi_prt_entry *entry;
449	int gsi;
450	u8 pin;
451
452	pin = dev->pin;
453	if (!pin)
454		return;
455
456	entry = acpi_pci_irq_lookup(dev, pin);
457	if (!entry)
458		return;
459
460	if (entry->link)
461		gsi = acpi_pci_link_free_irq(entry->link);
462	else
463		gsi = entry->index;
464
465	/*
466	 * TBD: It might be worth clearing dev->irq by magic constant
467	 * (e.g. PCI_UNDEFINED_IRQ).
468	 */
469
470	dev_info(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
471	acpi_unregister_gsi(gsi);
472}