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1da177e4 LT |
1 | /* |
2 | * PCIEHPRM ACPI: PHP Resource Manager for ACPI platform | |
3 | * | |
4 | * Copyright (C) 2003-2004 Intel Corporation | |
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 LT |
27 | #include <linux/module.h> |
28 | #include <linux/kernel.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/pci.h> | |
1da177e4 | 31 | #include <linux/acpi.h> |
1da177e4 | 32 | #include <linux/pci-acpi.h> |
1da177e4 LT |
33 | #include <acpi/acpi_bus.h> |
34 | #include <acpi/actypes.h> | |
35 | #include "pciehp.h" | |
1da177e4 LT |
36 | |
37 | #define METHOD_NAME__SUN "_SUN" | |
38 | #define METHOD_NAME__HPP "_HPP" | |
39 | #define METHOD_NAME_OSHP "OSHP" | |
40 | ||
1da177e4 LT |
41 | static u8 * acpi_path_name( acpi_handle handle) |
42 | { | |
43 | acpi_status status; | |
44 | static u8 path_name[ACPI_PATHNAME_MAX]; | |
45 | struct acpi_buffer ret_buf = { ACPI_PATHNAME_MAX, path_name }; | |
46 | ||
47 | memset(path_name, 0, sizeof (path_name)); | |
48 | status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &ret_buf); | |
49 | ||
50 | if (ACPI_FAILURE(status)) | |
51 | return NULL; | |
52 | else | |
53 | return path_name; | |
54 | } | |
55 | ||
a8a2be94 RS |
56 | static acpi_status |
57 | acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp) | |
1da177e4 LT |
58 | { |
59 | acpi_status status; | |
60 | u8 nui[4]; | |
61 | struct acpi_buffer ret_buf = { 0, NULL}; | |
62 | union acpi_object *ext_obj, *package; | |
a8a2be94 | 63 | u8 *path_name = acpi_path_name(handle); |
1da177e4 LT |
64 | int i, len = 0; |
65 | ||
66 | /* get _hpp */ | |
a8a2be94 | 67 | status = acpi_evaluate_object(handle, METHOD_NAME__HPP, NULL, &ret_buf); |
1da177e4 LT |
68 | switch (status) { |
69 | case AE_BUFFER_OVERFLOW: | |
70 | ret_buf.pointer = kmalloc (ret_buf.length, GFP_KERNEL); | |
71 | if (!ret_buf.pointer) { | |
a8a2be94 RS |
72 | err ("%s:%s alloc for _HPP fail\n", __FUNCTION__, |
73 | path_name); | |
74 | return AE_NO_MEMORY; | |
1da177e4 | 75 | } |
a8a2be94 RS |
76 | status = acpi_evaluate_object(handle, METHOD_NAME__HPP, |
77 | NULL, &ret_buf); | |
1da177e4 LT |
78 | if (ACPI_SUCCESS(status)) |
79 | break; | |
80 | default: | |
81 | if (ACPI_FAILURE(status)) { | |
a8a2be94 RS |
82 | dbg("%s:%s _HPP fail=0x%x\n", __FUNCTION__, |
83 | path_name, status); | |
84 | return status; | |
1da177e4 LT |
85 | } |
86 | } | |
87 | ||
88 | ext_obj = (union acpi_object *) ret_buf.pointer; | |
89 | if (ext_obj->type != ACPI_TYPE_PACKAGE) { | |
a8a2be94 RS |
90 | err ("%s:%s _HPP obj not a package\n", __FUNCTION__, |
91 | path_name); | |
92 | status = AE_ERROR; | |
1da177e4 LT |
93 | goto free_and_return; |
94 | } | |
95 | ||
96 | len = ext_obj->package.count; | |
97 | package = (union acpi_object *) ret_buf.pointer; | |
98 | for ( i = 0; (i < len) || (i < 4); i++) { | |
99 | ext_obj = (union acpi_object *) &package->package.elements[i]; | |
100 | switch (ext_obj->type) { | |
101 | case ACPI_TYPE_INTEGER: | |
102 | nui[i] = (u8)ext_obj->integer.value; | |
103 | break; | |
104 | default: | |
a8a2be94 RS |
105 | err ("%s:%s _HPP obj type incorrect\n", __FUNCTION__, |
106 | path_name); | |
107 | status = AE_ERROR; | |
1da177e4 LT |
108 | goto free_and_return; |
109 | } | |
110 | } | |
111 | ||
a8a2be94 RS |
112 | hpp->cache_line_size = nui[0]; |
113 | hpp->latency_timer = nui[1]; | |
114 | hpp->enable_serr = nui[2]; | |
115 | hpp->enable_perr = nui[3]; | |
1da177e4 | 116 | |
a8a2be94 RS |
117 | dbg(" _HPP: cache_line_size=0x%x\n", hpp->cache_line_size); |
118 | dbg(" _HPP: latency timer =0x%x\n", hpp->latency_timer); | |
119 | dbg(" _HPP: enable SERR =0x%x\n", hpp->enable_serr); | |
120 | dbg(" _HPP: enable PERR =0x%x\n", hpp->enable_perr); | |
1da177e4 LT |
121 | |
122 | free_and_return: | |
123 | kfree(ret_buf.pointer); | |
a8a2be94 | 124 | return status; |
1da177e4 LT |
125 | } |
126 | ||
a8a2be94 | 127 | static acpi_status acpi_run_oshp(acpi_handle handle) |
1da177e4 LT |
128 | { |
129 | acpi_status status; | |
a8a2be94 | 130 | u8 *path_name = acpi_path_name(handle); |
1da177e4 LT |
131 | |
132 | /* run OSHP */ | |
a8a2be94 | 133 | status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL); |
1da177e4 | 134 | if (ACPI_FAILURE(status)) { |
a3a45ec8 | 135 | dbg("%s:%s OSHP fails=0x%x\n", __FUNCTION__, path_name, |
a8a2be94 | 136 | status); |
1da177e4 | 137 | } else { |
a8a2be94 | 138 | dbg("%s:%s OSHP passes\n", __FUNCTION__, path_name); |
1da177e4 | 139 | } |
a8a2be94 | 140 | return status; |
1da177e4 LT |
141 | } |
142 | ||
a3a45ec8 RS |
143 | static int is_root_bridge(acpi_handle handle) |
144 | { | |
145 | acpi_status status; | |
146 | struct acpi_device_info *info; | |
147 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
148 | int i; | |
149 | ||
150 | status = acpi_get_object_info(handle, &buffer); | |
151 | if (ACPI_SUCCESS(status)) { | |
152 | info = buffer.pointer; | |
153 | if ((info->valid & ACPI_VALID_HID) && | |
154 | !strcmp(PCI_ROOT_HID_STRING, | |
155 | info->hardware_id.value)) { | |
156 | acpi_os_free(buffer.pointer); | |
157 | return 1; | |
158 | } | |
159 | if (info->valid & ACPI_VALID_CID) { | |
160 | for (i=0; i < info->compatibility_id.count; i++) { | |
161 | if (!strcmp(PCI_ROOT_HID_STRING, | |
162 | info->compatibility_id.id[i].value)) { | |
163 | acpi_os_free(buffer.pointer); | |
164 | return 1; | |
165 | } | |
166 | } | |
167 | } | |
168 | } | |
169 | return 0; | |
170 | } | |
171 | ||
6560aa5c | 172 | int pciehp_get_hp_hw_control_from_firmware(struct pci_dev *dev) |
1da177e4 | 173 | { |
a8a2be94 | 174 | acpi_status status; |
a3a45ec8 RS |
175 | acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev)); |
176 | struct pci_dev *pdev = dev; | |
c2dea655 | 177 | struct pci_bus *parent; |
a3a45ec8 | 178 | u8 *path_name; |
c2dea655 | 179 | |
a8a2be94 RS |
180 | /* |
181 | * Per PCI firmware specification, we should run the ACPI _OSC | |
a3a45ec8 RS |
182 | * method to get control of hotplug hardware before using it. |
183 | * If an _OSC is missing, we look for an OSHP to do the same thing. | |
184 | * To handle different BIOS behavior, we look for _OSC and OSHP | |
185 | * within the scope of the hotplug controller and its parents, upto | |
186 | * the host bridge under which this controller exists. | |
a8a2be94 | 187 | */ |
a3a45ec8 | 188 | while (!handle) { |
a8a2be94 | 189 | /* |
a3a45ec8 RS |
190 | * This hotplug controller was not listed in the ACPI name |
191 | * space at all. Try to get acpi handle of parent pci bus. | |
a8a2be94 | 192 | */ |
a3a45ec8 RS |
193 | if (!pdev || !pdev->bus->parent) |
194 | break; | |
c2dea655 | 195 | parent = pdev->bus->parent; |
a3a45ec8 RS |
196 | dbg("Could not find %s in acpi namespace, trying parent\n", |
197 | pci_name(pdev)); | |
c2dea655 | 198 | if (!parent->self) |
a3a45ec8 RS |
199 | /* Parent must be a host bridge */ |
200 | handle = acpi_get_pci_rootbridge_handle( | |
c2dea655 JJ |
201 | pci_domain_nr(parent), |
202 | parent->number); | |
a3a45ec8 RS |
203 | else |
204 | handle = DEVICE_ACPI_HANDLE( | |
c2dea655 JJ |
205 | &(parent->self->dev)); |
206 | pdev = parent->self; | |
1da177e4 | 207 | } |
a3a45ec8 RS |
208 | |
209 | while (handle) { | |
210 | path_name = acpi_path_name(handle); | |
211 | dbg("Trying to get hotplug control for %s \n", path_name); | |
212 | status = pci_osc_control_set(handle, | |
213 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL); | |
214 | if (status == AE_NOT_FOUND) | |
215 | status = acpi_run_oshp(handle); | |
216 | if (ACPI_SUCCESS(status)) { | |
217 | dbg("Gained control for hotplug HW for pci %s (%s)\n", | |
218 | pci_name(dev), path_name); | |
219 | return 0; | |
220 | } | |
221 | if (is_root_bridge(handle)) | |
222 | break; | |
223 | chandle = handle; | |
224 | status = acpi_get_parent(chandle, &handle); | |
225 | if (ACPI_FAILURE(status)) | |
226 | break; | |
1da177e4 LT |
227 | } |
228 | ||
a3a45ec8 RS |
229 | err("Cannot get control of hotplug hardware for pci %s\n", |
230 | pci_name(dev)); | |
231 | return -1; | |
1da177e4 LT |
232 | } |
233 | ||
6560aa5c | 234 | void pciehp_get_hp_params_from_firmware(struct pci_dev *dev, |
a8a2be94 | 235 | struct hotplug_params *hpp) |
1da177e4 | 236 | { |
a8a2be94 RS |
237 | acpi_status status = AE_NOT_FOUND; |
238 | struct pci_dev *pdev = dev; | |
1da177e4 LT |
239 | |
240 | /* | |
a8a2be94 RS |
241 | * _HPP settings apply to all child buses, until another _HPP is |
242 | * encountered. If we don't find an _HPP for the input pci dev, | |
243 | * look for it in the parent device scope since that would apply to | |
244 | * this pci dev. If we don't find any _HPP, use hardcoded defaults | |
1da177e4 | 245 | */ |
a8a2be94 RS |
246 | while (pdev && (ACPI_FAILURE(status))) { |
247 | acpi_handle handle = DEVICE_ACPI_HANDLE(&(pdev->dev)); | |
248 | if (!handle) | |
249 | break; | |
250 | status = acpi_run_hpp(handle, hpp); | |
251 | if (!(pdev->bus->parent)) | |
252 | break; | |
253 | /* Check if a parent object supports _HPP */ | |
254 | pdev = pdev->bus->parent->self; | |
1da177e4 | 255 | } |
1da177e4 LT |
256 | } |
257 |