4 bool "Enable driver model for timer drivers"
7 Enable driver model for timer access. It uses the same API as
8 lib/time.c, but now implemented by the uclass. The first timer
9 will be used. The timer is usually a 32 bits free-running up
10 counter. There may be no real tick, and no timer interrupt.
13 bool "Enable driver model for timer drivers in SPL"
14 depends on TIMER && SPL
16 Enable support for timer drivers in SPL. These can be used to get
17 a timer value when in SPL, or perhaps for implementing a delay
18 function. This enables the drivers in drivers/timer as part of an
22 bool "Enable driver model for timer drivers in TPL"
23 depends on TIMER && TPL
25 Enable support for timer drivers in TPL. These can be used to get
26 a timer value when in TPL, or perhaps for implementing a delay
27 function. This enables the drivers in drivers/timer as part of an
31 bool "Allow timer to be used early in U-Boot"
33 # initr_bootstage() requires a timer and is called before initr_dm()
34 # so only the early timer is available
35 default y if X86 && BOOTSTAGE
37 In some cases the timer must be accessible before driver model is
38 active. Examples include when using CONFIG_TRACE to trace U-Boot's
39 execution before driver model is set up. Enable this option to
40 use an early timer. These functions must be supported by your timer
41 driver: timer_early_get_count() and timer_early_get_rate().
44 bool "AG101P timer support"
45 depends on TIMER && NDS32
47 Select this to enable a timer for AG01P devices.
50 bool "Altera timer support"
53 Select this to enable a timer for Altera devices. Please find
54 details on the "Embedded Peripherals IP User Guide" of Altera.
57 bool "ARC timer support"
58 depends on TIMER && ARC && CLK
60 Select this to enable built-in ARC timers.
61 ARC cores may have up to 2 built-in timers: timer0 and timer1,
62 usually at least one of them exists. Either of them is supported
66 bool "Aspeed ast2400/ast2500 timer support"
68 default y if ARCH_ASPEED
70 Select this to enable timer for Aspeed ast2400/ast2500 devices.
71 This is a simple sys timer driver, it is compatible with lib/time.c,
72 but does not support any interrupts. Even though SoC has 8 hardware
73 counters, they are all treated as a single device by this driver.
74 This is mostly because they all share several registers which
75 makes it difficult to completely separate them.
77 config ATCPIT100_TIMER
78 bool "ATCPIT100 timer support"
81 Select this to enable a ATCPIT100 timer which will be embedded
82 in AE3XX, AE250 boards.
84 config ATMEL_PIT_TIMER
85 bool "Atmel periodic interval timer support"
88 Select this to enable a periodic interval timer for Atmel devices,
89 it is designed to offer maximum accuracy and efficient management,
90 even for systems with long response time.
92 config CADENCE_TTC_TIMER
93 bool "Cadence TTC (Triple Timer Counter)"
96 Enables support for the cadence ttc driver. This driver is present
97 on Xilinx Zynq and ZynqMP SoCs.
99 config DESIGNWARE_APB_TIMER
100 bool "Designware APB Timer"
103 Enables support for the Designware APB Timer driver. This timer is
104 present on Altera SoCFPGA SoCs.
107 bool "MPC83xx timer support"
110 Select this to enable support for the timer found on
111 devices based on the MPC83xx family of SoCs.
113 config RENESAS_OSTM_TIMER
114 bool "Renesas RZ/A1 R7S72100 OSTM Timer"
117 Enables support for the Renesas OSTM Timer driver.
118 This timer is present on Renesas RZ/A1 R7S72100 SoCs.
120 config X86_TSC_TIMER_EARLY_FREQ
121 int "x86 TSC timer frequency in MHz when used as the early timer"
122 depends on X86_TSC_TIMER
125 Sets the estimated CPU frequency in MHz when TSC is used as the
126 early timer and the frequency can neither be calibrated via some
127 hardware ways, nor got from device tree at the time when device
128 tree is not available yet.
130 config NOMADIK_MTU_TIMER
131 bool "Nomadik MTU Timer"
134 Enables support for the Nomadik Multi Timer Unit (MTU),
135 used in ST-Ericsson Ux500 SoCs.
136 The MTU provides 4 decrementing free-running timers.
137 At the moment, only the first timer is used by the driver.
140 bool "Omap timer support"
143 Select this to enable an timer for Omap devices.
146 bool "RISC-V timer support"
147 depends on TIMER && RISCV
149 Select this to enable support for the timer as defined
150 by the RISC-V privileged architecture spec.
152 config ROCKCHIP_TIMER
153 bool "Rockchip timer support"
156 Select this to enable support for the timer found on
160 bool "Sandbox timer support"
161 depends on SANDBOX && TIMER
163 Select this to enable an emulated timer for sandbox. It gets
167 bool "STi timer support"
169 default y if ARCH_STI
171 Select this to enable a timer for STi devices.
174 bool "STM32 timer support"
177 Select this to enable support for the timer found on
181 bool "x86 Time-Stamp Counter (TSC) timer support"
182 depends on TIMER && X86
184 Select this to enable Time-Stamp Counter (TSC) timer for x86.
186 config X86_TSC_READ_BASE
187 bool "Read the TSC timer base on start-up"
188 depends on X86_TSC_TIMER
190 On x86 platforms the TSC timer tick starts at the value 0 on reset.
191 This it makes no sense to read the timer on boot and use that as the
192 base, since we will miss some time taken to load U-Boot, etc. This
193 delay is controlled by the SoC and we cannot reduce it, but for
194 bootstage we want to record the time since reset as accurately as
197 The only exception is when U-Boot is used as a secondary bootloader,
198 where this option should be enabled.
200 config TPL_X86_TSC_TIMER_NATIVE
201 bool "x86 TSC timer uses native calibration"
202 depends on TPL && X86_TSC_TIMER
204 Selects native timer calibration for TPL and don't include the other
205 methods in the code. This helps to reduce code size in TPL and works
206 on fairly modern Intel chips. Code-size reductions is about 700
210 bool "MediaTek timer support"
213 Select this to enable support for the timer found on