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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.c215
1 files changed, 0 insertions, 215 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 368ca72dffbc..ea15b0537457 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -18,221 +18,6 @@
18#include <linux/pci-acpi.h> 18#include <linux/pci-acpi.h>
19#include "pci.h" 19#include "pci.h"
20 20
21struct acpi_osc_data {
22 acpi_handle handle;
23 u32 support_set;
24 u32 control_set;
25 u32 control_query;
26 int is_queried;
27 struct list_head sibiling;
28};
29static LIST_HEAD(acpi_osc_data_list);
30
31struct acpi_osc_args {
32 u32 capbuf[3];
33};
34
35static DEFINE_MUTEX(pci_acpi_lock);
36
37static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
38{
39 struct acpi_osc_data *data;
40
41 list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
42 if (data->handle == handle)
43 return data;
44 }
45 data = kzalloc(sizeof(*data), GFP_KERNEL);
46 if (!data)
47 return NULL;
48 INIT_LIST_HEAD(&data->sibiling);
49 data->handle = handle;
50 list_add_tail(&data->sibiling, &acpi_osc_data_list);
51 return data;
52}
53
54static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
55 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
56
57static acpi_status acpi_run_osc(acpi_handle handle,
58 struct acpi_osc_args *osc_args, u32 *retval)
59{
60 acpi_status status;
61 struct acpi_object_list input;
62 union acpi_object in_params[4];
63 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
64 union acpi_object *out_obj;
65 u32 errors, flags = osc_args->capbuf[OSC_QUERY_TYPE];
66
67 /* Setting up input parameters */
68 input.count = 4;
69 input.pointer = in_params;
70 in_params[0].type = ACPI_TYPE_BUFFER;
71 in_params[0].buffer.length = 16;
72 in_params[0].buffer.pointer = OSC_UUID;
73 in_params[1].type = ACPI_TYPE_INTEGER;
74 in_params[1].integer.value = 1;
75 in_params[2].type = ACPI_TYPE_INTEGER;
76 in_params[2].integer.value = 3;
77 in_params[3].type = ACPI_TYPE_BUFFER;
78 in_params[3].buffer.length = 12;
79 in_params[3].buffer.pointer = (u8 *)osc_args->capbuf;
80
81 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
82 if (ACPI_FAILURE(status))
83 return status;
84
85 if (!output.length)
86 return AE_NULL_OBJECT;
87
88 out_obj = output.pointer;
89 if (out_obj->type != ACPI_TYPE_BUFFER) {
90 printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
91 status = AE_TYPE;
92 goto out_kfree;
93 }
94 /* Need to ignore the bit0 in result code */
95 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
96 if (errors) {
97 if (errors & OSC_REQUEST_ERROR)
98 printk(KERN_DEBUG "_OSC request fails\n");
99 if (errors & OSC_INVALID_UUID_ERROR)
100 printk(KERN_DEBUG "_OSC invalid UUID\n");
101 if (errors & OSC_INVALID_REVISION_ERROR)
102 printk(KERN_DEBUG "_OSC invalid revision\n");
103 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
104 if (flags & OSC_QUERY_ENABLE)
105 goto out_success;
106 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
107 status = AE_SUPPORT;
108 goto out_kfree;
109 }
110 status = AE_ERROR;
111 goto out_kfree;
112 }
113out_success:
114 *retval = *((u32 *)(out_obj->buffer.pointer + 8));
115 status = AE_OK;
116
117out_kfree:
118 kfree(output.pointer);
119 return status;
120}
121
122static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data)
123{
124 acpi_status status;
125 u32 support_set, result;
126 struct acpi_osc_args osc_args;
127
128 /* do _OSC query for all possible controls */
129 support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
130 osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
131 osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
132 osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
133
134 status = acpi_run_osc(osc_data->handle, &osc_args, &result);
135 if (ACPI_SUCCESS(status)) {
136 osc_data->support_set = support_set;
137 osc_data->control_query = result;
138 osc_data->is_queried = 1;
139 }
140
141 return status;
142}
143
144/*
145 * pci_acpi_osc_support: Invoke _OSC indicating support for the given feature
146 * @flags: Bitmask of flags to support
147 *
148 * See the ACPI spec for the definition of the flags
149 */
150int pci_acpi_osc_support(acpi_handle handle, u32 flags)
151{
152 acpi_status status;
153 acpi_handle tmp;
154 struct acpi_osc_data *osc_data;
155 int rc = 0;
156
157 status = acpi_get_handle(handle, "_OSC", &tmp);
158 if (ACPI_FAILURE(status))
159 return -ENOTTY;
160
161 mutex_lock(&pci_acpi_lock);
162 osc_data = acpi_get_osc_data(handle);
163 if (!osc_data) {
164 printk(KERN_ERR "acpi osc data array is full\n");
165 rc = -ENOMEM;
166 goto out;
167 }
168
169 __acpi_query_osc(flags, osc_data);
170out:
171 mutex_unlock(&pci_acpi_lock);
172 return rc;
173}
174
175/**
176 * pci_osc_control_set - commit requested control to Firmware
177 * @handle: acpi_handle for the target ACPI object
178 * @flags: driver's requested control bits
179 *
180 * Attempt to take control from Firmware on requested control bits.
181 **/
182acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
183{
184 acpi_status status;
185 u32 control_req, control_set, result;
186 acpi_handle tmp;
187 struct acpi_osc_data *osc_data;
188 struct acpi_osc_args osc_args;
189
190 status = acpi_get_handle(handle, "_OSC", &tmp);
191 if (ACPI_FAILURE(status))
192 return status;
193
194 mutex_lock(&pci_acpi_lock);
195 osc_data = acpi_get_osc_data(handle);
196 if (!osc_data) {
197 printk(KERN_ERR "acpi osc data array is full\n");
198 status = AE_ERROR;
199 goto out;
200 }
201
202 control_req = (flags & OSC_CONTROL_MASKS);
203 if (!control_req) {
204 status = AE_TYPE;
205 goto out;
206 }
207
208 /* No need to evaluate _OSC if the control was already granted. */
209 if ((osc_data->control_set & control_req) == control_req)
210 goto out;
211
212 if (!osc_data->is_queried) {
213 status = __acpi_query_osc(osc_data->support_set, osc_data);
214 if (ACPI_FAILURE(status))
215 goto out;
216 }
217
218 if ((osc_data->control_query & control_req) != control_req) {
219 status = AE_SUPPORT;
220 goto out;
221 }
222
223 control_set = osc_data->control_set | control_req;
224 osc_args.capbuf[OSC_QUERY_TYPE] = 0;
225 osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
226 osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
227 status = acpi_run_osc(handle, &osc_args, &result);
228 if (ACPI_SUCCESS(status))
229 osc_data->control_set = result;
230out:
231 mutex_unlock(&pci_acpi_lock);
232 return status;
233}
234EXPORT_SYMBOL(pci_osc_control_set);
235
236/* 21/*
237 * _SxD returns the D-state with the highest power 22 * _SxD returns the D-state with the highest power
238 * (lowest D-state number) supported in the S-state "x". 23 * (lowest D-state number) supported in the S-state "x".
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-22 13:40:00 -0500