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path: root/drivers/pci/pci-acpi.c
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Diffstat (limited to 'drivers/pci/pci-acpi.c')
-rw-r--r--drivers/pci/pci-acpi.c209
1 files changed, 209 insertions, 0 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
new file mode 100644
index 000000000000..968eb32f292d
--- /dev/null
+++ b/drivers/pci/pci-acpi.c
@@ -0,0 +1,209 @@
1/*
2 * File: pci-acpi.c
3 * Purpose: Provide PCI supports in ACPI
4 *
5 * Copyright (C) 2004 Intel
6 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
7 */
8
9#include <linux/delay.h>
10#include <linux/init.h>
11#include <linux/pci.h>
12#include <linux/module.h>
13#include <acpi/acpi.h>
14#include <acpi/acnamesp.h>
15#include <acpi/acresrc.h>
16#include <acpi/acpi_bus.h>
17
18#include <linux/pci-acpi.h>
19
20static u32 ctrlset_buf[3] = {0, 0, 0};
21static u32 global_ctrlsets = 0;
22u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
23
24static acpi_status
25acpi_query_osc (
26 acpi_handle handle,
27 u32 level,
28 void *context,
29 void **retval )
30{
31 acpi_status status;
32 struct acpi_object_list input;
33 union acpi_object in_params[4];
34 struct acpi_buffer output;
35 union acpi_object out_obj;
36 u32 osc_dw0;
37
38 /* Setting up output buffer */
39 output.length = sizeof(out_obj) + 3*sizeof(u32);
40 output.pointer = &out_obj;
41
42 /* Setting up input parameters */
43 input.count = 4;
44 input.pointer = in_params;
45 in_params[0].type = ACPI_TYPE_BUFFER;
46 in_params[0].buffer.length = 16;
47 in_params[0].buffer.pointer = OSC_UUID;
48 in_params[1].type = ACPI_TYPE_INTEGER;
49 in_params[1].integer.value = 1;
50 in_params[2].type = ACPI_TYPE_INTEGER;
51 in_params[2].integer.value = 3;
52 in_params[3].type = ACPI_TYPE_BUFFER;
53 in_params[3].buffer.length = 12;
54 in_params[3].buffer.pointer = (u8 *)context;
55
56 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
57 if (ACPI_FAILURE (status)) {
58 printk(KERN_DEBUG
59 "Evaluate _OSC Set fails. Status = 0x%04x\n", status);
60 return status;
61 }
62 if (out_obj.type != ACPI_TYPE_BUFFER) {
63 printk(KERN_DEBUG
64 "Evaluate _OSC returns wrong type\n");
65 return AE_TYPE;
66 }
67 osc_dw0 = *((u32 *) out_obj.buffer.pointer);
68 if (osc_dw0) {
69 if (osc_dw0 & OSC_REQUEST_ERROR)
70 printk(KERN_DEBUG "_OSC request fails\n");
71 if (osc_dw0 & OSC_INVALID_UUID_ERROR)
72 printk(KERN_DEBUG "_OSC invalid UUID\n");
73 if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
74 printk(KERN_DEBUG "_OSC invalid revision\n");
75 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
76 /* Update Global Control Set */
77 global_ctrlsets = *((u32 *)(out_obj.buffer.pointer+8));
78 return AE_OK;
79 }
80 return AE_ERROR;
81 }
82
83 /* Update Global Control Set */
84 global_ctrlsets = *((u32 *)(out_obj.buffer.pointer + 8));
85 return AE_OK;
86}
87
88
89static acpi_status
90acpi_run_osc (
91 acpi_handle handle,
92 u32 level,
93 void *context,
94 void **retval )
95{
96 acpi_status status;
97 struct acpi_object_list input;
98 union acpi_object in_params[4];
99 struct acpi_buffer output;
100 union acpi_object out_obj;
101 u32 osc_dw0;
102
103 /* Setting up output buffer */
104 output.length = sizeof(out_obj) + 3*sizeof(u32);
105 output.pointer = &out_obj;
106
107 /* Setting up input parameters */
108 input.count = 4;
109 input.pointer = in_params;
110 in_params[0].type = ACPI_TYPE_BUFFER;
111 in_params[0].buffer.length = 16;
112 in_params[0].buffer.pointer = OSC_UUID;
113 in_params[1].type = ACPI_TYPE_INTEGER;
114 in_params[1].integer.value = 1;
115 in_params[2].type = ACPI_TYPE_INTEGER;
116 in_params[2].integer.value = 3;
117 in_params[3].type = ACPI_TYPE_BUFFER;
118 in_params[3].buffer.length = 12;
119 in_params[3].buffer.pointer = (u8 *)context;
120
121 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
122 if (ACPI_FAILURE (status)) {
123 printk(KERN_DEBUG
124 "Evaluate _OSC Set fails. Status = 0x%04x\n", status);
125 return status;
126 }
127 if (out_obj.type != ACPI_TYPE_BUFFER) {
128 printk(KERN_DEBUG
129 "Evaluate _OSC returns wrong type\n");
130 return AE_TYPE;
131 }
132 osc_dw0 = *((u32 *) out_obj.buffer.pointer);
133 if (osc_dw0) {
134 if (osc_dw0 & OSC_REQUEST_ERROR)
135 printk(KERN_DEBUG "_OSC request fails\n");
136 if (osc_dw0 & OSC_INVALID_UUID_ERROR)
137 printk(KERN_DEBUG "_OSC invalid UUID\n");
138 if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
139 printk(KERN_DEBUG "_OSC invalid revision\n");
140 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
141 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
142 return AE_SUPPORT;
143 }
144 return AE_ERROR;
145 }
146 return AE_OK;
147}
148
149/**
150 * pci_osc_support_set - register OS support to Firmware
151 * @flags: OS support bits
152 *
153 * Update OS support fields and doing a _OSC Query to obtain an update
154 * from Firmware on supported control bits.
155 **/
156acpi_status pci_osc_support_set(u32 flags)
157{
158 u32 temp;
159
160 if (!(flags & OSC_SUPPORT_MASKS)) {
161 return AE_TYPE;
162 }
163 ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS);
164
165 /* do _OSC query for all possible controls */
166 temp = ctrlset_buf[OSC_CONTROL_TYPE];
167 ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
168 ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
169 acpi_get_devices ( PCI_ROOT_HID_STRING,
170 acpi_query_osc,
171 ctrlset_buf,
172 NULL );
173 ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE;
174 ctrlset_buf[OSC_CONTROL_TYPE] = temp;
175 return AE_OK;
176}
177EXPORT_SYMBOL(pci_osc_support_set);
178
179/**
180 * pci_osc_control_set - commit requested control to Firmware
181 * @flags: driver's requested control bits
182 *
183 * Attempt to take control from Firmware on requested control bits.
184 **/
185acpi_status pci_osc_control_set(u32 flags)
186{
187 acpi_status status;
188 u32 ctrlset;
189
190 ctrlset = (flags & OSC_CONTROL_MASKS);
191 if (!ctrlset) {
192 return AE_TYPE;
193 }
194 if (ctrlset_buf[OSC_SUPPORT_TYPE] &&
195 ((global_ctrlsets & ctrlset) != ctrlset)) {
196 return AE_SUPPORT;
197 }
198 ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset;
199 status = acpi_get_devices ( PCI_ROOT_HID_STRING,
200 acpi_run_osc,
201 ctrlset_buf,
202 NULL );
203 if (ACPI_FAILURE (status)) {
204 ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
205 }
206
207 return status;
208}
209EXPORT_SYMBOL(pci_osc_control_set);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-20 17:16:04 -0500