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1a3ffdff HW |
1 | /** @file\r |
2 | Private data structures\r | |
3 | \r | |
4 | Copyright (c) 2005 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
6 | **/\r | |
7 | \r | |
8 | #ifndef _TIMER_H_\r | |
9 | #define _TIMER_H_\r | |
10 | \r | |
11 | #include <PiDxe.h>\r | |
12 | \r | |
13 | #include <Protocol/Cpu.h>\r | |
14 | #include <Protocol/Legacy8259.h>\r | |
15 | #include <Protocol/Timer.h>\r | |
16 | \r | |
17 | #include <Library/UefiBootServicesTableLib.h>\r | |
18 | #include <Library/BaseLib.h>\r | |
19 | #include <Library/DebugLib.h>\r | |
20 | #include <Library/IoLib.h>\r | |
21 | \r | |
22 | //\r | |
23 | // The PCAT 8253/8254 has an input clock at 1.193182 MHz and Timer 0 is\r | |
24 | // initialized as a 16 bit free running counter that generates an interrupt(IRQ0)\r | |
25 | // each time the counter rolls over.\r | |
26 | //\r | |
27 | // 65536 counts\r | |
28 | // ---------------- * 1,000,000 uS/S = 54925.4 uS = 549254 * 100 ns\r | |
29 | // 1,193,182 Hz\r | |
30 | //\r | |
31 | \r | |
32 | //\r | |
33 | // The maximum tick duration for 8254 timer\r | |
34 | //\r | |
ac0a286f | 35 | #define MAX_TIMER_TICK_DURATION 549254\r |
1a3ffdff HW |
36 | //\r |
37 | // The default timer tick duration is set to 10 ms = 100000 100 ns units\r | |
38 | //\r | |
ac0a286f MK |
39 | #define DEFAULT_TIMER_TICK_DURATION 100000\r |
40 | #define TIMER_CONTROL_PORT 0x43\r | |
41 | #define TIMER0_COUNT_PORT 0x40\r | |
1a3ffdff HW |
42 | \r |
43 | //\r | |
44 | // Function Prototypes\r | |
45 | //\r | |
ac0a286f | 46 | \r |
1a3ffdff HW |
47 | /**\r |
48 | Initialize the Timer Architectural Protocol driver\r | |
49 | \r | |
50 | @param ImageHandle ImageHandle of the loaded driver\r | |
51 | @param SystemTable Pointer to the System Table\r | |
52 | \r | |
53 | @retval EFI_SUCCESS Timer Architectural Protocol created\r | |
54 | @retval EFI_OUT_OF_RESOURCES Not enough resources available to initialize driver.\r | |
55 | @retval EFI_DEVICE_ERROR A device error occurred attempting to initialize the driver.\r | |
56 | \r | |
57 | **/\r | |
58 | EFI_STATUS\r | |
59 | EFIAPI\r | |
60 | TimerDriverInitialize (\r | |
61 | IN EFI_HANDLE ImageHandle,\r | |
62 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
63 | )\r | |
64 | ;\r | |
65 | \r | |
66 | /**\r | |
67 | \r | |
68 | This function adjusts the period of timer interrupts to the value specified\r | |
69 | by TimerPeriod. If the timer period is updated, then the selected timer\r | |
70 | period is stored in EFI_TIMER.TimerPeriod, and EFI_SUCCESS is returned. If\r | |
71 | the timer hardware is not programmable, then EFI_UNSUPPORTED is returned.\r | |
72 | If an error occurs while attempting to update the timer period, then the\r | |
73 | timer hardware will be put back in its state prior to this call, and\r | |
74 | EFI_DEVICE_ERROR is returned. If TimerPeriod is 0, then the timer interrupt\r | |
75 | is disabled. This is not the same as disabling the CPU's interrupts.\r | |
76 | Instead, it must either turn off the timer hardware, or it must adjust the\r | |
77 | interrupt controller so that a CPU interrupt is not generated when the timer\r | |
78 | interrupt fires.\r | |
79 | \r | |
80 | \r | |
81 | @param This The EFI_TIMER_ARCH_PROTOCOL instance.\r | |
82 | @param NotifyFunction The rate to program the timer interrupt in 100 nS units. If\r | |
83 | the timer hardware is not programmable, then EFI_UNSUPPORTED is\r | |
84 | returned. If the timer is programmable, then the timer period\r | |
85 | will be rounded up to the nearest timer period that is supported\r | |
86 | by the timer hardware. If TimerPeriod is set to 0, then the\r | |
87 | timer interrupts will be disabled.\r | |
88 | \r | |
89 | @retval EFI_SUCCESS The timer period was changed.\r | |
90 | @retval EFI_UNSUPPORTED The platform cannot change the period of the timer interrupt.\r | |
91 | @retval EFI_DEVICE_ERROR The timer period could not be changed due to a device error.\r | |
92 | \r | |
93 | **/\r | |
94 | EFI_STATUS\r | |
95 | EFIAPI\r | |
96 | TimerDriverRegisterHandler (\r | |
97 | IN EFI_TIMER_ARCH_PROTOCOL *This,\r | |
98 | IN EFI_TIMER_NOTIFY NotifyFunction\r | |
99 | )\r | |
100 | ;\r | |
101 | \r | |
102 | /**\r | |
103 | \r | |
104 | This function adjusts the period of timer interrupts to the value specified\r | |
105 | by TimerPeriod. If the timer period is updated, then the selected timer\r | |
106 | period is stored in EFI_TIMER.TimerPeriod, and EFI_SUCCESS is returned. If\r | |
107 | the timer hardware is not programmable, then EFI_UNSUPPORTED is returned.\r | |
108 | If an error occurs while attempting to update the timer period, then the\r | |
109 | timer hardware will be put back in its state prior to this call, and\r | |
110 | EFI_DEVICE_ERROR is returned. If TimerPeriod is 0, then the timer interrupt\r | |
111 | is disabled. This is not the same as disabling the CPU's interrupts.\r | |
112 | Instead, it must either turn off the timer hardware, or it must adjust the\r | |
113 | interrupt controller so that a CPU interrupt is not generated when the timer\r | |
114 | interrupt fires.\r | |
115 | \r | |
116 | \r | |
117 | @param This The EFI_TIMER_ARCH_PROTOCOL instance.\r | |
118 | @param TimerPeriod The rate to program the timer interrupt in 100 nS units. If\r | |
119 | the timer hardware is not programmable, then EFI_UNSUPPORTED is\r | |
120 | returned. If the timer is programmable, then the timer period\r | |
121 | will be rounded up to the nearest timer period that is supported\r | |
122 | by the timer hardware. If TimerPeriod is set to 0, then the\r | |
123 | timer interrupts will be disabled.\r | |
124 | \r | |
125 | @retval EFI_SUCCESS The timer period was changed.\r | |
126 | @retval EFI_UNSUPPORTED The platform cannot change the period of the timer interrupt.\r | |
127 | @retval EFI_DEVICE_ERROR The timer period could not be changed due to a device error.\r | |
128 | \r | |
129 | **/\r | |
130 | EFI_STATUS\r | |
131 | EFIAPI\r | |
132 | TimerDriverSetTimerPeriod (\r | |
133 | IN EFI_TIMER_ARCH_PROTOCOL *This,\r | |
134 | IN UINT64 TimerPeriod\r | |
135 | )\r | |
136 | ;\r | |
137 | \r | |
138 | /**\r | |
139 | \r | |
140 | This function retrieves the period of timer interrupts in 100 ns units,\r | |
141 | returns that value in TimerPeriod, and returns EFI_SUCCESS. If TimerPeriod\r | |
142 | is NULL, then EFI_INVALID_PARAMETER is returned. If a TimerPeriod of 0 is\r | |
143 | returned, then the timer is currently disabled.\r | |
144 | \r | |
145 | \r | |
146 | @param This The EFI_TIMER_ARCH_PROTOCOL instance.\r | |
147 | @param TimerPeriod A pointer to the timer period to retrieve in 100 ns units. If\r | |
148 | 0 is returned, then the timer is currently disabled.\r | |
149 | \r | |
150 | @retval EFI_SUCCESS The timer period was returned in TimerPeriod.\r | |
151 | @retval EFI_INVALID_PARAMETER TimerPeriod is NULL.\r | |
152 | \r | |
153 | **/\r | |
154 | EFI_STATUS\r | |
155 | EFIAPI\r | |
156 | TimerDriverGetTimerPeriod (\r | |
ac0a286f MK |
157 | IN EFI_TIMER_ARCH_PROTOCOL *This,\r |
158 | OUT UINT64 *TimerPeriod\r | |
1a3ffdff HW |
159 | )\r |
160 | ;\r | |
161 | \r | |
162 | /**\r | |
163 | \r | |
164 | This function generates a soft timer interrupt. If the platform does not support soft\r | |
165 | timer interrupts, then EFI_UNSUPPORTED is returned. Otherwise, EFI_SUCCESS is returned.\r | |
166 | If a handler has been registered through the EFI_TIMER_ARCH_PROTOCOL.RegisterHandler()\r | |
167 | service, then a soft timer interrupt will be generated. If the timer interrupt is\r | |
168 | enabled when this service is called, then the registered handler will be invoked. The\r | |
169 | registered handler should not be able to distinguish a hardware-generated timer\r | |
170 | interrupt from a software-generated timer interrupt.\r | |
171 | \r | |
172 | \r | |
173 | @param This The EFI_TIMER_ARCH_PROTOCOL instance.\r | |
174 | \r | |
175 | @retval EFI_SUCCESS The soft timer interrupt was generated.\r | |
176 | @retval EFI_UNSUPPORTED The platform does not support the generation of soft timer interrupts.\r | |
177 | \r | |
178 | **/\r | |
179 | EFI_STATUS\r | |
180 | EFIAPI\r | |
181 | TimerDriverGenerateSoftInterrupt (\r | |
182 | IN EFI_TIMER_ARCH_PROTOCOL *This\r | |
183 | )\r | |
184 | ;\r | |
185 | \r | |
186 | #endif\r |