[linux-block.git] / drivers / pci / hotplug / acpi_pcihp.c

/*
 * Common ACPI functions for hot plug platforms
 *
 * Copyright (C) 2006 Intel Corporation
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <kristen.c.accardi@intel.com>
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/actypes.h>
#include "pci_hotplug.h"

#define MY_NAME	"acpi_pcihp"

#define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __FUNCTION__ , ## arg); } while (0)
#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)

#define	METHOD_NAME__SUN	"_SUN"
#define	METHOD_NAME__HPP	"_HPP"
#define	METHOD_NAME_OSHP	"OSHP"

static int debug_acpi;

static acpi_status
decode_type0_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
{
	int i;
	union acpi_object *fields = record->package.elements;
	u32 revision = fields[1].integer.value;

	switch (revision) {
	case 1:
		if (record->package.count != 6)
			return AE_ERROR;
		for (i = 2; i < 6; i++)
			if (fields[i].type != ACPI_TYPE_INTEGER)
				return AE_ERROR;
		hpx->t0 = &hpx->type0_data;
		hpx->t0->revision        = revision;
		hpx->t0->cache_line_size = fields[2].integer.value;
		hpx->t0->latency_timer   = fields[3].integer.value;
		hpx->t0->enable_serr     = fields[4].integer.value;
		hpx->t0->enable_perr     = fields[5].integer.value;
		break;
	default:
		printk(KERN_WARNING
		       "%s: Type 0 Revision %d record not supported\n",
		       __FUNCTION__, revision);
		return AE_ERROR;
	}
	return AE_OK;
}

static acpi_status
decode_type1_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
{
	int i;
	union acpi_object *fields = record->package.elements;
	u32 revision = fields[1].integer.value;

	switch (revision) {
	case 1:
		if (record->package.count != 5)
			return AE_ERROR;
		for (i = 2; i < 5; i++)
			if (fields[i].type != ACPI_TYPE_INTEGER)
				return AE_ERROR;
		hpx->t1 = &hpx->type1_data;
		hpx->t1->revision      = revision;
		hpx->t1->max_mem_read  = fields[2].integer.value;
		hpx->t1->avg_max_split = fields[3].integer.value;
		hpx->t1->tot_max_split = fields[4].integer.value;
		break;
	default:
		printk(KERN_WARNING
		       "%s: Type 1 Revision %d record not supported\n",
		       __FUNCTION__, revision);
		return AE_ERROR;
	}
	return AE_OK;
}

static acpi_status
decode_type2_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
{
	int i;
	union acpi_object *fields = record->package.elements;
	u32 revision = fields[1].integer.value;

	switch (revision) {
	case 1:
		if (record->package.count != 18)
			return AE_ERROR;
		for (i = 2; i < 18; i++)
			if (fields[i].type != ACPI_TYPE_INTEGER)
				return AE_ERROR;
		hpx->t2 = &hpx->type2_data;
		hpx->t2->revision      = revision;
		hpx->t2->unc_err_mask_and      = fields[2].integer.value;
		hpx->t2->unc_err_mask_or       = fields[3].integer.value;
		hpx->t2->unc_err_sever_and     = fields[4].integer.value;
		hpx->t2->unc_err_sever_or      = fields[5].integer.value;
		hpx->t2->cor_err_mask_and      = fields[6].integer.value;
		hpx->t2->cor_err_mask_or       = fields[7].integer.value;
		hpx->t2->adv_err_cap_and       = fields[8].integer.value;
		hpx->t2->adv_err_cap_or        = fields[9].integer.value;
		hpx->t2->pci_exp_devctl_and    = fields[10].integer.value;
		hpx->t2->pci_exp_devctl_or     = fields[11].integer.value;
		hpx->t2->pci_exp_lnkctl_and    = fields[12].integer.value;
		hpx->t2->pci_exp_lnkctl_or     = fields[13].integer.value;
		hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
		hpx->t2->sec_unc_err_sever_or  = fields[15].integer.value;
		hpx->t2->sec_unc_err_mask_and  = fields[16].integer.value;
		hpx->t2->sec_unc_err_mask_or   = fields[17].integer.value;
		break;
	default:
		printk(KERN_WARNING
		       "%s: Type 2 Revision %d record not supported\n",
		       __FUNCTION__, revision);
		return AE_ERROR;
	}
	return AE_OK;
}

static acpi_status
acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
{
	acpi_status status;
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object *package, *record, *fields;
	u32 type;
	int i;

	/* Clear the return buffer with zeros */
	memset(hpx, 0, sizeof(struct hotplug_params));

	status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
	if (ACPI_FAILURE(status))
		return status;

	package = (union acpi_object *)buffer.pointer;
	if (package->type != ACPI_TYPE_PACKAGE) {
		status = AE_ERROR;
		goto exit;
	}

	for (i = 0; i < package->package.count; i++) {
		record = &package->package.elements[i];
		if (record->type != ACPI_TYPE_PACKAGE) {
			status = AE_ERROR;
			goto exit;
		}

		fields = record->package.elements;
		if (fields[0].type != ACPI_TYPE_INTEGER ||
		    fields[1].type != ACPI_TYPE_INTEGER) {
			status = AE_ERROR;
			goto exit;
		}

		type = fields[0].integer.value;
		switch (type) {
		case 0:
			status = decode_type0_hpx_record(record, hpx);
			if (ACPI_FAILURE(status))
				goto exit;
			break;
		case 1:
			status = decode_type1_hpx_record(record, hpx);
			if (ACPI_FAILURE(status))
				goto exit;
			break;
		case 2:
			status = decode_type2_hpx_record(record, hpx);
			if (ACPI_FAILURE(status))
				goto exit;
			break;
		default:
			printk(KERN_ERR "%s: Type %d record not supported\n",
			       __FUNCTION__, type);
			status = AE_ERROR;
			goto exit;
		}
	}
 exit:
	kfree(buffer.pointer);
	return status;
}

static acpi_status
acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
{
	acpi_status		status;
	u8			nui[4];
	struct acpi_buffer	ret_buf = { 0, NULL};
	struct acpi_buffer	string = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object	*ext_obj, *package;
	int			i, len = 0;

	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);

	/* Clear the return buffer with zeros */
	memset(hpp, 0, sizeof(struct hotplug_params));

	/* get _hpp */
	status = acpi_evaluate_object(handle, METHOD_NAME__HPP, NULL, &ret_buf);
	switch (status) {
	case AE_BUFFER_OVERFLOW:
		ret_buf.pointer = kmalloc (ret_buf.length, GFP_KERNEL);
		if (!ret_buf.pointer) {
			printk(KERN_ERR "%s:%s alloc for _HPP fail\n",
				__FUNCTION__, (char *)string.pointer);
			kfree(string.pointer);
			return AE_NO_MEMORY;
		}
		status = acpi_evaluate_object(handle, METHOD_NAME__HPP,
				NULL, &ret_buf);
		if (ACPI_SUCCESS(status))
			break;
	default:
		if (ACPI_FAILURE(status)) {
			pr_debug("%s:%s _HPP fail=0x%x\n", __FUNCTION__,
				(char *)string.pointer, status);
			kfree(string.pointer);
			return status;
		}
	}

	ext_obj = (union acpi_object *) ret_buf.pointer;
	if (ext_obj->type != ACPI_TYPE_PACKAGE) {
		printk(KERN_ERR "%s:%s _HPP obj not a package\n", __FUNCTION__,
				(char *)string.pointer);
		status = AE_ERROR;
		goto free_and_return;
	}

	len = ext_obj->package.count;
	package = (union acpi_object *) ret_buf.pointer;
	for ( i = 0; (i < len) || (i < 4); i++) {
		ext_obj = (union acpi_object *) &package->package.elements[i];
		switch (ext_obj->type) {
		case ACPI_TYPE_INTEGER:
			nui[i] = (u8)ext_obj->integer.value;
			break;
		default:
			printk(KERN_ERR "%s:%s _HPP obj type incorrect\n",
				__FUNCTION__, (char *)string.pointer);
			status = AE_ERROR;
			goto free_and_return;
		}
	}

	hpp->t0 = &hpp->type0_data;
	hpp->t0->cache_line_size = nui[0];
	hpp->t0->latency_timer = nui[1];
	hpp->t0->enable_serr = nui[2];
	hpp->t0->enable_perr = nui[3];

	pr_debug("  _HPP: cache_line_size=0x%x\n", hpp->t0->cache_line_size);
	pr_debug("  _HPP: latency timer  =0x%x\n", hpp->t0->latency_timer);
	pr_debug("  _HPP: enable SERR    =0x%x\n", hpp->t0->enable_serr);
	pr_debug("  _HPP: enable PERR    =0x%x\n", hpp->t0->enable_perr);

free_and_return:
	kfree(string.pointer);
	kfree(ret_buf.pointer);
	return status;
}


/* acpi_run_oshp - get control of hotplug from the firmware
 *
 * @handle - the handle of the hotplug controller.
 */
acpi_status acpi_run_oshp(acpi_handle handle)
{
	acpi_status		status;
	struct acpi_buffer	string = { ACPI_ALLOCATE_BUFFER, NULL };

	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);

	/* run OSHP */
	status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL);
	if (ACPI_FAILURE(status))
		if (status != AE_NOT_FOUND)
			printk(KERN_ERR "%s:%s OSHP fails=0x%x\n",
			       __FUNCTION__, (char *)string.pointer, status);
		else
			dbg("%s:%s OSHP not found\n",
			    __FUNCTION__, (char *)string.pointer);
	else
		pr_debug("%s:%s OSHP passes\n", __FUNCTION__,
			(char *)string.pointer);

	kfree(string.pointer);
	return status;
}
EXPORT_SYMBOL_GPL(acpi_run_oshp);


/* acpi_get_hp_params_from_firmware
 *
 * @bus - the pci_bus of the bus on which the device is newly added
 * @hpp - allocated by the caller
 */
acpi_status acpi_get_hp_params_from_firmware(struct pci_bus *bus,
		struct hotplug_params *hpp)
{
	acpi_status status = AE_NOT_FOUND;
	acpi_handle handle, phandle;
	struct pci_bus *pbus = bus;
	struct pci_dev *pdev;

	do {
		pdev = pbus->self;
		if (!pdev) {
			handle = acpi_get_pci_rootbridge_handle(
				pci_domain_nr(pbus), pbus->number);
			break;
		}
		handle = DEVICE_ACPI_HANDLE(&(pdev->dev));
		pbus = pbus->parent;
	} while (!handle);

	/*
	 * _HPP settings apply to all child buses, until another _HPP is
	 * encountered. If we don't find an _HPP for the input pci dev,
	 * look for it in the parent device scope since that would apply to
	 * this pci dev. If we don't find any _HPP, use hardcoded defaults
	 */
	while (handle) {
		status = acpi_run_hpx(handle, hpp);
		if (ACPI_SUCCESS(status))
			break;
		status = acpi_run_hpp(handle, hpp);
		if (ACPI_SUCCESS(status))
			break;
		if (acpi_root_bridge(handle))
			break;
		status = acpi_get_parent(handle, &phandle);
		if (ACPI_FAILURE(status))
			break;
		handle = phandle;
	}
	return status;
}
EXPORT_SYMBOL_GPL(acpi_get_hp_params_from_firmware);


/* acpi_root_bridge - check to see if this acpi object is a root bridge
 *
 * @handle - the acpi object in question.
 */
int acpi_root_bridge(acpi_handle handle)
{
	acpi_status status;
	struct acpi_device_info *info;
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	int i;

	status = acpi_get_object_info(handle, &buffer);
	if (ACPI_SUCCESS(status)) {
		info = buffer.pointer;
		if ((info->valid & ACPI_VALID_HID) &&
			!strcmp(PCI_ROOT_HID_STRING,
					info->hardware_id.value)) {
			kfree(buffer.pointer);
			return 1;
		}
		if (info->valid & ACPI_VALID_CID) {
			for (i=0; i < info->compatibility_id.count; i++) {
				if (!strcmp(PCI_ROOT_HID_STRING,
					info->compatibility_id.id[i].value)) {
					kfree(buffer.pointer);
					return 1;
				}
			}
		}
		kfree(buffer.pointer);
	}
	return 0;
}
EXPORT_SYMBOL_GPL(acpi_root_bridge);

module_param(debug_acpi, bool, 0644);
MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not");
Commit	Line	Data
1da177e4	1	/*
783c49fc	2	* Common ACPI functions for hot plug platforms
1da177e4	3	*
783c49fc	4	* Copyright (C) 2006 Intel Corporation
1da177e4 LT	5	*
	6	* All rights reserved.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or (at
	11	* your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	16	* NON INFRINGEMENT. See the GNU General Public License for more
	17	* details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*
8cf4c195	23	* Send feedback to <kristen.c.accardi@intel.com>
1da177e4 LT	24	*
	25	*/
	26
1da177e4	27	#include <linux/module.h>
aad20cab	28	#include <linux/moduleparam.h>
1da177e4 LT	29	#include <linux/kernel.h>
	30	#include <linux/types.h>
	31	#include <linux/pci.h>
783c49fc	32	#include <acpi/acpi.h>
1da177e4 LT	33	#include <acpi/acpi_bus.h>
1da177e4 LT	34	#include <acpi/actypes.h>
783c49fc	35	#include "pci_hotplug.h"
1da177e4	36
aad20cab KK	37	#define MY_NAME "acpi_pcihp"
	38
	39	#define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __FUNCTION__ , ## arg); } while (0)
	40	#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
	41	#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
	42	#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
	43
1da177e4 LT	44	#define METHOD_NAME__SUN "_SUN"
	45	#define METHOD_NAME__HPP "_HPP"
	46	#define METHOD_NAME_OSHP "OSHP"
	47
aad20cab KK	48	static int debug_acpi;
aad20cab KK	49
e22b7350 KK	50	static acpi_status
	51	decode_type0_hpx_record(union acpi_object record, struct hotplug_params hpx)
	52	{
	53	int i;
	54	union acpi_object *fields = record->package.elements;
	55	u32 revision = fields[1].integer.value;
	56
	57	switch (revision) {
	58	case 1:
	59	if (record->package.count != 6)
	60	return AE_ERROR;
	61	for (i = 2; i < 6; i++)
	62	if (fields[i].type != ACPI_TYPE_INTEGER)
	63	return AE_ERROR;
	64	hpx->t0 = &hpx->type0_data;
	65	hpx->t0->revision = revision;
	66	hpx->t0->cache_line_size = fields[2].integer.value;
	67	hpx->t0->latency_timer = fields[3].integer.value;
	68	hpx->t0->enable_serr = fields[4].integer.value;
	69	hpx->t0->enable_perr = fields[5].integer.value;
	70	break;
	71	default:
	72	printk(KERN_WARNING
	73	"%s: Type 0 Revision %d record not supported\n",
	74	__FUNCTION__, revision);
	75	return AE_ERROR;
	76	}
	77	return AE_OK;
	78	}
	79
	80	static acpi_status
	81	decode_type1_hpx_record(union acpi_object record, struct hotplug_params hpx)
	82	{
	83	int i;
	84	union acpi_object *fields = record->package.elements;
	85	u32 revision = fields[1].integer.value;
	86
	87	switch (revision) {
	88	case 1:
	89	if (record->package.count != 5)
	90	return AE_ERROR;
	91	for (i = 2; i < 5; i++)
	92	if (fields[i].type != ACPI_TYPE_INTEGER)
	93	return AE_ERROR;
	94	hpx->t1 = &hpx->type1_data;
	95	hpx->t1->revision = revision;
	96	hpx->t1->max_mem_read = fields[2].integer.value;
	97	hpx->t1->avg_max_split = fields[3].integer.value;
	98	hpx->t1->tot_max_split = fields[4].integer.value;
	99	break;
	100	default:
	101	printk(KERN_WARNING
	102	"%s: Type 1 Revision %d record not supported\n",
	103	__FUNCTION__, revision);
	104	return AE_ERROR;
	105	}
	106	return AE_OK;
	107	}
	108
	109	static acpi_status
	110	decode_type2_hpx_record(union acpi_object record, struct hotplug_params hpx)
	111	{
	112	int i;
	113	union acpi_object *fields = record->package.elements;
114	u32 revision = fields[1].integer.value;
115
116	switch (revision) {
117	case 1:
118	if (record->package.count != 18)
119	return AE_ERROR;
120	for (i = 2; i < 18; i++)
121	if (fields[i].type != ACPI_TYPE_INTEGER)
122	return AE_ERROR;
123	hpx->t2 = &hpx->type2_data;
124	hpx->t2->revision = revision;
125	hpx->t2->unc_err_mask_and = fields[2].integer.value;
126	hpx->t2->unc_err_mask_or = fields[3].integer.value;
127	hpx->t2->unc_err_sever_and = fields[4].integer.value;
128	hpx->t2->unc_err_sever_or = fields[5].integer.value;
129	hpx->t2->cor_err_mask_and = fields[6].integer.value;
130	hpx->t2->cor_err_mask_or = fields[7].integer.value;
131	hpx->t2->adv_err_cap_and = fields[8].integer.value;
132	hpx->t2->adv_err_cap_or = fields[9].integer.value;
133	hpx->t2->pci_exp_devctl_and = fields[10].integer.value;
134	hpx->t2->pci_exp_devctl_or = fields[11].integer.value;
135	hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value;
136	hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value;
137	hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
138	hpx->t2->sec_unc_err_sever_or = fields[15].integer.value;
139	hpx->t2->sec_unc_err_mask_and = fields[16].integer.value;
140	hpx->t2->sec_unc_err_mask_or = fields[17].integer.value;
141	break;
142	default:
143	printk(KERN_WARNING
144	"%s: Type 2 Revision %d record not supported\n",
145	__FUNCTION__, revision);
146	return AE_ERROR;
147	}
148	return AE_OK;
149	}
150
151	static acpi_status
152	acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
153	{
154	acpi_status status;
155	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
156	union acpi_object package, record, *fields;
157	u32 type;
158	int i;
159
160	/* Clear the return buffer with zeros */
161	memset(hpx, 0, sizeof(struct hotplug_params));
162
163	status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
164	if (ACPI_FAILURE(status))
165	return status;
166
167	package = (union acpi_object *)buffer.pointer;
168	if (package->type != ACPI_TYPE_PACKAGE) {
169	status = AE_ERROR;
170	goto exit;
171	}
172
173	for (i = 0; i < package->package.count; i++) {
174	record = &package->package.elements[i];
175	if (record->type != ACPI_TYPE_PACKAGE) {
176	status = AE_ERROR;
177	goto exit;
178	}
179
180	fields = record->package.elements;
181	if (fields[0].type != ACPI_TYPE_INTEGER \|\|
182	fields[1].type != ACPI_TYPE_INTEGER) {
183	status = AE_ERROR;
184	goto exit;
185	}
186
187	type = fields[0].integer.value;
188	switch (type) {
189	case 0:
190	status = decode_type0_hpx_record(record, hpx);
191	if (ACPI_FAILURE(status))
192	goto exit;
193	break;
194	case 1:
195	status = decode_type1_hpx_record(record, hpx);
196	if (ACPI_FAILURE(status))
197	goto exit;
198	break;
199	case 2:
200	status = decode_type2_hpx_record(record, hpx);
201	if (ACPI_FAILURE(status))
202	goto exit;
203	break;
204	default:
205	printk(KERN_ERR "%s: Type %d record not supported\n",
206	__FUNCTION__, type);
207	status = AE_ERROR;
208	goto exit;
209	}
210	}
211	exit:
212	kfree(buffer.pointer);
213	return status;
214	}
1da177e4	215
a8a2be94	216	static acpi_status
a8a2be94	217	acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
1da177e4 LT	218	{
	219	acpi_status status;
	220	u8 nui[4];
	221	struct acpi_buffer ret_buf = { 0, NULL};
b2e6e3ba	222	struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
1da177e4	223	union acpi_object ext_obj, package;
1da177e4 LT	224	int i, len = 0;
1da177e4 LT	225
b2e6e3ba MT	226	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
b2e6e3ba MT	227
e22b7350 KK	228	/* Clear the return buffer with zeros */
	229	memset(hpp, 0, sizeof(struct hotplug_params));
	230
1da177e4	231	/* get _hpp */
a8a2be94	232	status = acpi_evaluate_object(handle, METHOD_NAME__HPP, NULL, &ret_buf);
1da177e4 LT	233	switch (status) {
	234	case AE_BUFFER_OVERFLOW:
	235	ret_buf.pointer = kmalloc (ret_buf.length, GFP_KERNEL);
	236	if (!ret_buf.pointer) {
783c49fc	237	printk(KERN_ERR "%s:%s alloc for _HPP fail\n",
b2e6e3ba	238	__FUNCTION__, (char *)string.pointer);
81b26bca	239	kfree(string.pointer);
a8a2be94	240	return AE_NO_MEMORY;
1da177e4	241	}
a8a2be94	242	status = acpi_evaluate_object(handle, METHOD_NAME__HPP,
a8a2be94	243	NULL, &ret_buf);
1da177e4 LT	244	if (ACPI_SUCCESS(status))
	245	break;
	246	default:
	247	if (ACPI_FAILURE(status)) {
783c49fc	248	pr_debug("%s:%s _HPP fail=0x%x\n", __FUNCTION__,
b2e6e3ba	249	(char *)string.pointer, status);
81b26bca	250	kfree(string.pointer);
a8a2be94	251	return status;
1da177e4 LT	252	}
	253	}
	254
	255	ext_obj = (union acpi_object *) ret_buf.pointer;
	256	if (ext_obj->type != ACPI_TYPE_PACKAGE) {
783c49fc	257	printk(KERN_ERR "%s:%s _HPP obj not a package\n", __FUNCTION__,
b2e6e3ba	258	(char *)string.pointer);
a8a2be94	259	status = AE_ERROR;
1da177e4 LT	260	goto free_and_return;
	261	}
	262
	263	len = ext_obj->package.count;
	264	package = (union acpi_object *) ret_buf.pointer;
	265	for ( i = 0; (i < len) \|\| (i < 4); i++) {
	266	ext_obj = (union acpi_object *) &package->package.elements[i];
	267	switch (ext_obj->type) {
	268	case ACPI_TYPE_INTEGER:
	269	nui[i] = (u8)ext_obj->integer.value;
	270	break;
	271	default:
783c49fc	272	printk(KERN_ERR "%s:%s _HPP obj type incorrect\n",
b2e6e3ba	273	__FUNCTION__, (char *)string.pointer);
a8a2be94	274	status = AE_ERROR;
1da177e4 LT	275	goto free_and_return;
	276	}
	277	}
	278
e22b7350 KK	279	hpp->t0 = &hpp->type0_data;
	280	hpp->t0->cache_line_size = nui[0];
	281	hpp->t0->latency_timer = nui[1];
	282	hpp->t0->enable_serr = nui[2];
	283	hpp->t0->enable_perr = nui[3];
1da177e4	284
e22b7350 KK	285	pr_debug(" _HPP: cache_line_size=0x%x\n", hpp->t0->cache_line_size);
	286	pr_debug(" _HPP: latency timer =0x%x\n", hpp->t0->latency_timer);
	287	pr_debug(" _HPP: enable SERR =0x%x\n", hpp->t0->enable_serr);
	288	pr_debug(" _HPP: enable PERR =0x%x\n", hpp->t0->enable_perr);
1da177e4 LT	289
1da177e4 LT	290	free_and_return:
81b26bca KA	291	kfree(string.pointer);
81b26bca KA	292	kfree(ret_buf.pointer);
a8a2be94	293	return status;
1da177e4 LT	294	}
1da177e4 LT	295
783c49fc KA	296
	297
	298	/* acpi_run_oshp - get control of hotplug from the firmware
	299	*
	300	* @handle - the handle of the hotplug controller.
	301	*/
	302	acpi_status acpi_run_oshp(acpi_handle handle)
1da177e4 LT	303	{
1da177e4 LT	304	acpi_status status;
b2e6e3ba MT	305	struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
	306
	307	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
1da177e4 LT	308
1da177e4 LT	309	/* run OSHP */
a8a2be94	310	status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL);
783c49fc	311	if (ACPI_FAILURE(status))
aad20cab KK	312	if (status != AE_NOT_FOUND)
	313	printk(KERN_ERR "%s:%s OSHP fails=0x%x\n",
	314	__FUNCTION__, (char *)string.pointer, status);
	315	else
	316	dbg("%s:%s OSHP not found\n",
	317	__FUNCTION__, (char *)string.pointer);
783c49fc	318	else
b2e6e3ba MT	319	pr_debug("%s:%s OSHP passes\n", __FUNCTION__,
	320	(char *)string.pointer);
	321
81b26bca	322	kfree(string.pointer);
783c49fc KA	323	return status;
	324	}
	325	EXPORT_SYMBOL_GPL(acpi_run_oshp);
	326
	327
	328
	329	/* acpi_get_hp_params_from_firmware
	330	*
7430e34c	331	* @bus - the pci_bus of the bus on which the device is newly added
783c49fc KA	332	* @hpp - allocated by the caller
783c49fc KA	333	*/
7430e34c	334	acpi_status acpi_get_hp_params_from_firmware(struct pci_bus *bus,
783c49fc KA	335	struct hotplug_params *hpp)
	336	{
	337	acpi_status status = AE_NOT_FOUND;
7430e34c KK	338	acpi_handle handle, phandle;
	339	struct pci_bus *pbus = bus;
	340	struct pci_dev *pdev;
	341
	342	do {
	343	pdev = pbus->self;
	344	if (!pdev) {
	345	handle = acpi_get_pci_rootbridge_handle(
	346	pci_domain_nr(pbus), pbus->number);
	347	break;
	348	}
	349	handle = DEVICE_ACPI_HANDLE(&(pdev->dev));
	350	pbus = pbus->parent;
	351	} while (!handle);
783c49fc KA	352
	353	/*
	354	* _HPP settings apply to all child buses, until another _HPP is
	355	* encountered. If we don't find an _HPP for the input pci dev,
	356	* look for it in the parent device scope since that would apply to
	357	* this pci dev. If we don't find any _HPP, use hardcoded defaults
	358	*/
7430e34c	359	while (handle) {
e22b7350 KK	360	status = acpi_run_hpx(handle, hpp);
	361	if (ACPI_SUCCESS(status))
	362	break;
783c49fc	363	status = acpi_run_hpp(handle, hpp);
7430e34c KK	364	if (ACPI_SUCCESS(status))
	365	break;
	366	if (acpi_root_bridge(handle))
	367	break;
	368	status = acpi_get_parent(handle, &phandle);
	369	if (ACPI_FAILURE(status))
783c49fc	370	break;
7430e34c	371	handle = phandle;
1da177e4	372	}
a8a2be94	373	return status;
1da177e4	374	}
783c49fc KA	375	EXPORT_SYMBOL_GPL(acpi_get_hp_params_from_firmware);
783c49fc KA	376
1da177e4	377
783c49fc KA	378	/* acpi_root_bridge - check to see if this acpi object is a root bridge
	379	*
	380	* @handle - the acpi object in question.
	381	*/
	382	int acpi_root_bridge(acpi_handle handle)
a3a45ec8	383	{
	384	acpi_status status;
	385	struct acpi_device_info *info;
	386	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	387	int i;
	388
	389	status = acpi_get_object_info(handle, &buffer);
	390	if (ACPI_SUCCESS(status)) {
	391	info = buffer.pointer;
	392	if ((info->valid & ACPI_VALID_HID) &&
	393	!strcmp(PCI_ROOT_HID_STRING,
	394	info->hardware_id.value)) {
81b26bca	395	kfree(buffer.pointer);
a3a45ec8	396	return 1;
	397	}
	398	if (info->valid & ACPI_VALID_CID) {
	399	for (i=0; i < info->compatibility_id.count; i++) {
	400	if (!strcmp(PCI_ROOT_HID_STRING,
	401	info->compatibility_id.id[i].value)) {
81b26bca	402	kfree(buffer.pointer);
a3a45ec8	403	return 1;
	404	}
	405	}
	406	}
81b26bca	407	kfree(buffer.pointer);
a3a45ec8	408	}
	409	return 0;
	410	}
783c49fc	411	EXPORT_SYMBOL_GPL(acpi_root_bridge);
aad20cab KK	412
	413	module_param(debug_acpi, bool, 0644);
	414	MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not");