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menu "Timer Support"
config TIMER
bool "Enable driver model for timer drivers"
depends on DM
help
Enable driver model for timer access. It uses the same API as
lib/time.c, but now implemented by the uclass. The first timer
will be used. The timer is usually a 32 bits free-running up
counter. There may be no real tick, and no timer interrupt.
config SPL_TIMER
bool "Enable driver model for timer drivers in SPL"
depends on TIMER && SPL
help
Enable support for timer drivers in SPL. These can be used to get
a timer value when in SPL, or perhaps for implementing a delay
function. This enables the drivers in drivers/timer as part of an
SPL build.
config TPL_TIMER
bool "Enable driver model for timer drivers in TPL"
depends on TIMER && TPL
help
Enable support for timer drivers in TPL. These can be used to get
a timer value when in TPL, or perhaps for implementing a delay
function. This enables the drivers in drivers/timer as part of an
TPL build.
config TIMER_EARLY
bool "Allow timer to be used early in U-Boot"
depends on TIMER
# initr_bootstage() requires a timer and is called before initr_dm()
# so only the early timer is available
default y if X86 && BOOTSTAGE
help
In some cases the timer must be accessible before driver model is
active. Examples include when using CONFIG_TRACE to trace U-Boot's
execution before driver model is set up. Enable this option to
use an early timer. These functions must be supported by your timer
driver: timer_early_get_count() and timer_early_get_rate().
config AG101P_TIMER
bool "AG101P timer support"
depends on TIMER && NDS32
help
Select this to enable a timer for AG01P devices.
config ALTERA_TIMER
bool "Altera timer support"
depends on TIMER
help
Select this to enable a timer for Altera devices. Please find
details on the "Embedded Peripherals IP User Guide" of Altera.
config ARC_TIMER
bool "ARC timer support"
depends on TIMER && ARC && CLK
help
Select this to enable built-in ARC timers.
ARC cores may have up to 2 built-in timers: timer0 and timer1,
usually at least one of them exists. Either of them is supported
in U-Boot.
config AST_TIMER
bool "Aspeed ast2400/ast2500 timer support"
depends on TIMER
default y if ARCH_ASPEED
help
Select this to enable timer for Aspeed ast2400/ast2500 devices.
This is a simple sys timer driver, it is compatible with lib/time.c,
but does not support any interrupts. Even though SoC has 8 hardware
counters, they are all treated as a single device by this driver.
This is mostly because they all share several registers which
makes it difficult to completely separate them.
config ATCPIT100_TIMER
bool "ATCPIT100 timer support"
depends on TIMER
help
Select this to enable a ATCPIT100 timer which will be embedded
in AE3XX, AE250 boards.
config ATMEL_PIT_TIMER
bool "Atmel periodic interval timer support"
depends on TIMER
help
Select this to enable a periodic interval timer for Atmel devices,
it is designed to offer maximum accuracy and efficient management,
even for systems with long response time.
config CADENCE_TTC_TIMER
bool "Cadence TTC (Triple Timer Counter)"
depends on TIMER
help
Enables support for the cadence ttc driver. This driver is present
on Xilinx Zynq and ZynqMP SoCs.
config DESIGNWARE_APB_TIMER
bool "Designware APB Timer"
depends on TIMER
help
Enables support for the Designware APB Timer driver. This timer is
present on Altera SoCFPGA SoCs.
config MPC83XX_TIMER
bool "MPC83xx timer support"
depends on TIMER
help
Select this to enable support for the timer found on
devices based on the MPC83xx family of SoCs.
config RENESAS_OSTM_TIMER
bool "Renesas RZ/A1 R7S72100 OSTM Timer"
depends on TIMER
help
Enables support for the Renesas OSTM Timer driver.
This timer is present on Renesas RZ/A1 R7S72100 SoCs.
config X86_TSC_TIMER_EARLY_FREQ
int "x86 TSC timer frequency in MHz when used as the early timer"
depends on X86_TSC_TIMER
default 1000
help
Sets the estimated CPU frequency in MHz when TSC is used as the
early timer and the frequency can neither be calibrated via some
hardware ways, nor got from device tree at the time when device
tree is not available yet.
config OMAP_TIMER
bool "Omap timer support"
depends on TIMER
help
Select this to enable an timer for Omap devices.
config RISCV_TIMER
bool "RISC-V timer support"
depends on TIMER && RISCV
help
Select this to enable support for the timer as defined
by the RISC-V privileged architecture spec.
config ROCKCHIP_TIMER
bool "Rockchip timer support"
depends on TIMER
help
Select this to enable support for the timer found on
Rockchip devices.
config SANDBOX_TIMER
bool "Sandbox timer support"
depends on SANDBOX && TIMER
help
Select this to enable an emulated timer for sandbox. It gets
time from host os.
config STI_TIMER
bool "STi timer support"
depends on TIMER
default y if ARCH_STI
help
Select this to enable a timer for STi devices.
config STM32_TIMER
bool "STM32 timer support"
depends on TIMER
help
Select this to enable support for the timer found on
STM32 devices.
config X86_TSC_TIMER
bool "x86 Time-Stamp Counter (TSC) timer support"
depends on TIMER && X86
help
Select this to enable Time-Stamp Counter (TSC) timer for x86.
config X86_TSC_READ_BASE
bool "Read the TSC timer base on start-up"
depends on X86_TSC_TIMER
help
On x86 platforms the TSC timer tick starts at the value 0 on reset.
This it makes no sense to read the timer on boot and use that as the
base, since we will miss some time taken to load U-Boot, etc. This
delay is controlled by the SoC and we cannot reduce it, but for
bootstage we want to record the time since reset as accurately as
possible.
The only exception is when U-Boot is used as a secondary bootloader,
where this option should be enabled.
config TPL_X86_TSC_TIMER_NATIVE
bool "x86 TSC timer uses native calibration"
depends on TPL && X86_TSC_TIMER
help
Selects native timer calibration for TPL and don't include the other
methods in the code. This helps to reduce code size in TPL and works
on fairly modern Intel chips. Code-size reductions is about 700
bytes.
config MTK_TIMER
bool "MediaTek timer support"
depends on TIMER
help
Select this to enable support for the timer found on
MediaTek devices.
endmenu
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