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1498 | serge | 1 | |
2 | * |
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3 | * Name: hwtimer.c - ACPI Power Management Timer Interface |
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4 | * |
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5 | *****************************************************************************/ |
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6 | |||
7 | |||
8 | * |
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9 | * 1. Copyright Notice |
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10 | * |
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11 | * Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp. |
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2216 | Serge | 12 | * All rights reserved. |
1498 | serge | 13 | * |
14 | * 2. License |
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15 | * |
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16 | * 2.1. This is your license from Intel Corp. under its intellectual property |
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17 | * rights. You may have additional license terms from the party that provided |
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18 | * you this software, covering your right to use that party's intellectual |
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19 | * property rights. |
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20 | * |
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21 | * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a |
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22 | * copy of the source code appearing in this file ("Covered Code") an |
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23 | * irrevocable, perpetual, worldwide license under Intel's copyrights in the |
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24 | * base code distributed originally by Intel ("Original Intel Code") to copy, |
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25 | * make derivatives, distribute, use and display any portion of the Covered |
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26 | * Code in any form, with the right to sublicense such rights; and |
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27 | * |
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28 | * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent |
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29 | * license (with the right to sublicense), under only those claims of Intel |
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30 | * patents that are infringed by the Original Intel Code, to make, use, sell, |
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31 | * offer to sell, and import the Covered Code and derivative works thereof |
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32 | * solely to the minimum extent necessary to exercise the above copyright |
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33 | * license, and in no event shall the patent license extend to any additions |
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34 | * to or modifications of the Original Intel Code. No other license or right |
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35 | * is granted directly or by implication, estoppel or otherwise; |
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36 | * |
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37 | * The above copyright and patent license is granted only if the following |
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38 | * conditions are met: |
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39 | * |
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40 | * 3. Conditions |
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41 | * |
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42 | * 3.1. Redistribution of Source with Rights to Further Distribute Source. |
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43 | * Redistribution of source code of any substantial portion of the Covered |
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44 | * Code or modification with rights to further distribute source must include |
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45 | * the above Copyright Notice, the above License, this list of Conditions, |
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46 | * and the following Disclaimer and Export Compliance provision. In addition, |
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47 | * Licensee must cause all Covered Code to which Licensee contributes to |
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48 | * contain a file documenting the changes Licensee made to create that Covered |
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49 | * Code and the date of any change. Licensee must include in that file the |
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50 | * documentation of any changes made by any predecessor Licensee. Licensee |
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51 | * must include a prominent statement that the modification is derived, |
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52 | * directly or indirectly, from Original Intel Code. |
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53 | * |
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54 | * 3.2. Redistribution of Source with no Rights to Further Distribute Source. |
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55 | * Redistribution of source code of any substantial portion of the Covered |
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56 | * Code or modification without rights to further distribute source must |
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57 | * include the following Disclaimer and Export Compliance provision in the |
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58 | * documentation and/or other materials provided with distribution. In |
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59 | * addition, Licensee may not authorize further sublicense of source of any |
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60 | * portion of the Covered Code, and must include terms to the effect that the |
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61 | * license from Licensee to its licensee is limited to the intellectual |
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62 | * property embodied in the software Licensee provides to its licensee, and |
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63 | * not to intellectual property embodied in modifications its licensee may |
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64 | * make. |
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65 | * |
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66 | * 3.3. Redistribution of Executable. Redistribution in executable form of any |
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67 | * substantial portion of the Covered Code or modification must reproduce the |
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68 | * above Copyright Notice, and the following Disclaimer and Export Compliance |
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69 | * provision in the documentation and/or other materials provided with the |
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70 | * distribution. |
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71 | * |
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72 | * 3.4. Intel retains all right, title, and interest in and to the Original |
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73 | * Intel Code. |
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74 | * |
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75 | * 3.5. Neither the name Intel nor any other trademark owned or controlled by |
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76 | * Intel shall be used in advertising or otherwise to promote the sale, use or |
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77 | * other dealings in products derived from or relating to the Covered Code |
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78 | * without prior written authorization from Intel. |
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79 | * |
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80 | * 4. Disclaimer and Export Compliance |
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81 | * |
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82 | * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED |
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83 | * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE |
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84 | * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, |
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85 | * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY |
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86 | * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY |
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87 | * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A |
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88 | * PARTICULAR PURPOSE. |
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89 | * |
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90 | * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES |
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91 | * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR |
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92 | * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, |
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93 | * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY |
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94 | * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL |
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95 | * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS |
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96 | * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY |
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97 | * LIMITED REMEDY. |
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98 | * |
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99 | * 4.3. Licensee shall not export, either directly or indirectly, any of this |
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100 | * software or system incorporating such software without first obtaining any |
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101 | * required license or other approval from the U. S. Department of Commerce or |
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102 | * any other agency or department of the United States Government. In the |
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103 | * event Licensee exports any such software from the United States or |
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104 | * re-exports any such software from a foreign destination, Licensee shall |
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105 | * ensure that the distribution and export/re-export of the software is in |
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106 | * compliance with all laws, regulations, orders, or other restrictions of the |
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107 | * U.S. Export Administration Regulations. Licensee agrees that neither it nor |
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108 | * any of its subsidiaries will export/re-export any technical data, process, |
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109 | * software, or service, directly or indirectly, to any country for which the |
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110 | * United States government or any agency thereof requires an export license, |
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111 | * other governmental approval, or letter of assurance, without first obtaining |
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112 | * such license, approval or letter. |
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113 | * |
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114 | *****************************************************************************/ |
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115 | |||
116 | |||
117 | #include "accommon.h" |
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118 | |||
119 | |||
120 | ACPI_MODULE_NAME ("hwtimer") |
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121 | |||
122 | |||
123 | |||
124 | * |
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125 | * FUNCTION: AcpiGetTimerResolution |
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126 | * |
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127 | * PARAMETERS: Resolution - Where the resolution is returned |
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128 | * |
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129 | * RETURN: Status and timer resolution |
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130 | * |
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131 | * DESCRIPTION: Obtains resolution of the ACPI PM Timer (24 or 32 bits). |
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132 | * |
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133 | ******************************************************************************/ |
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134 | |||
135 | |||
136 | AcpiGetTimerResolution ( |
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137 | UINT32 *Resolution) |
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138 | { |
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139 | ACPI_FUNCTION_TRACE (AcpiGetTimerResolution); |
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140 | |||
141 | |||
142 | |||
143 | { |
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144 | return_ACPI_STATUS (AE_BAD_PARAMETER); |
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145 | } |
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146 | |||
147 | |||
148 | { |
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149 | *Resolution = 24; |
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150 | } |
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151 | else |
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152 | { |
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153 | *Resolution = 32; |
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154 | } |
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155 | |||
156 | |||
157 | } |
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158 | |||
159 | |||
160 | |||
161 | |||
162 | |||
163 | * |
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164 | * FUNCTION: AcpiGetTimer |
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165 | * |
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166 | * PARAMETERS: Ticks - Where the timer value is returned |
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167 | * |
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168 | * RETURN: Status and current timer value (ticks) |
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169 | * |
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170 | * DESCRIPTION: Obtains current value of ACPI PM Timer (in ticks). |
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171 | * |
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172 | ******************************************************************************/ |
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173 | |||
174 | |||
175 | AcpiGetTimer ( |
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176 | UINT32 *Ticks) |
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177 | { |
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178 | ACPI_STATUS Status; |
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179 | |||
180 | |||
181 | |||
182 | |||
183 | |||
184 | |||
185 | { |
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186 | return_ACPI_STATUS (AE_BAD_PARAMETER); |
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187 | } |
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188 | |||
189 | |||
190 | |||
191 | |||
192 | } |
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193 | |||
194 | |||
195 | |||
196 | |||
197 | |||
198 | * |
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199 | * FUNCTION: AcpiGetTimerDuration |
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200 | * |
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201 | * PARAMETERS: StartTicks - Starting timestamp |
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202 | * EndTicks - End timestamp |
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203 | * TimeElapsed - Where the elapsed time is returned |
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204 | * |
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205 | * RETURN: Status and TimeElapsed |
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206 | * |
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207 | * DESCRIPTION: Computes the time elapsed (in microseconds) between two |
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208 | * PM Timer time stamps, taking into account the possibility of |
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209 | * rollovers, the timer resolution, and timer frequency. |
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210 | * |
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211 | * The PM Timer's clock ticks at roughly 3.6 times per |
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212 | * _microsecond_, and its clock continues through Cx state |
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213 | * transitions (unlike many CPU timestamp counters) -- making it |
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214 | * a versatile and accurate timer. |
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215 | * |
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216 | * Note that this function accommodates only a single timer |
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217 | * rollover. Thus for 24-bit timers, this function should only |
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218 | * be used for calculating durations less than ~4.6 seconds |
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219 | * (~20 minutes for 32-bit timers) -- calculations below: |
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220 | * |
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221 | * 2**24 Ticks / 3,600,000 Ticks/Sec = 4.66 sec |
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222 | * 2**32 Ticks / 3,600,000 Ticks/Sec = 1193 sec or 19.88 minutes |
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223 | * |
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224 | ******************************************************************************/ |
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225 | |||
226 | |||
227 | AcpiGetTimerDuration ( |
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228 | UINT32 StartTicks, |
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229 | UINT32 EndTicks, |
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230 | UINT32 *TimeElapsed) |
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231 | { |
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232 | ACPI_STATUS Status; |
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233 | UINT32 DeltaTicks; |
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234 | UINT64 Quotient; |
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235 | |||
236 | |||
237 | |||
238 | |||
239 | |||
240 | |||
241 | { |
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242 | return_ACPI_STATUS (AE_BAD_PARAMETER); |
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243 | } |
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244 | |||
245 | |||
246 | * Compute Tick Delta: |
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247 | * Handle (max one) timer rollovers on 24-bit versus 32-bit timers. |
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248 | */ |
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249 | if (StartTicks < EndTicks) |
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250 | { |
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251 | DeltaTicks = EndTicks - StartTicks; |
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252 | } |
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253 | else if (StartTicks > EndTicks) |
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254 | { |
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255 | if ((AcpiGbl_FADT.Flags & ACPI_FADT_32BIT_TIMER) == 0) |
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256 | { |
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257 | /* 24-bit Timer */ |
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258 | |||
259 | |||
260 | } |
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261 | else |
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262 | { |
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263 | /* 32-bit Timer */ |
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264 | |||
265 | |||
266 | } |
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267 | } |
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268 | else /* StartTicks == EndTicks */ |
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269 | { |
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270 | *TimeElapsed = 0; |
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271 | return_ACPI_STATUS (AE_OK); |
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272 | } |
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273 | |||
274 | |||
275 | * Compute Duration (Requires a 64-bit multiply and divide): |
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276 | * |
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277 | * TimeElapsed = (DeltaTicks * 1000000) / PM_TIMER_FREQUENCY; |
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278 | */ |
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279 | Status = AcpiUtShortDivide (((UINT64) DeltaTicks) * 1000000, |
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280 | PM_TIMER_FREQUENCY, &Quotient, NULL); |
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281 | |||
282 | |||
283 | return_ACPI_STATUS (Status); |
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284 | } |
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285 | |||
286 | |||
287 |