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
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
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
it is designed to offer maximum accuracy and efficient management,
even for systems with long response time.
-config SANDBOX_TIMER
- bool "Sandbox timer support"
- depends on SANDBOX && TIMER
+config CADENCE_TTC_TIMER
+ bool "Cadence TTC (Triple Timer Counter)"
+ depends on TIMER
help
- Select this to enable an emulated timer for sandbox. It gets
- time from host os.
+ Enables support for the cadence ttc driver. This driver is present
+ on Xilinx Zynq and ZynqMP SoCs.
-config X86_TSC_TIMER
- bool "x86 Time-Stamp Counter (TSC) timer support"
- depends on TIMER && X86
+config DESIGNWARE_APB_TIMER
+ bool "Designware APB Timer"
+ depends on TIMER
help
- Select this to enable Time-Stamp Counter (TSC) timer for x86.
+ 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 NOMADIK_MTU_TIMER
+ bool "Nomadik MTU Timer"
+ depends on TIMER
+ help
+ Enables support for the Nomadik Multi Timer Unit (MTU),
+ used in ST-Ericsson Ux500 SoCs.
+ The MTU provides 4 decrementing free-running timers.
+ At the moment, only the first timer is used by the driver.
config OMAP_TIMER
bool "Omap timer support"
help
Select this to enable an timer for Omap devices.
-config AST_TIMER
- bool "Aspeed ast2400/ast2500 timer support"
+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
- 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.
+ 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"
help
Select this to enable a timer for STi devices.
-config ARC_TIMER
- bool "ARC timer support"
- depends on TIMER && ARC && CLK
+config STM32_TIMER
+ bool "STM32 timer support"
+ depends on TIMER
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.
+ Select this to enable support for the timer found on
+ STM32 devices.
-config AG101P_TIMER
- bool "AG101P timer support"
- depends on TIMER && NDS32
+config X86_TSC_TIMER
+ bool "x86 Time-Stamp Counter (TSC) timer support"
+ depends on TIMER && X86
help
- Select this to enable a timer for AG01P devices.
+ Select this to enable Time-Stamp Counter (TSC) timer for x86.
-config ATCPIT100_TIMER
- bool "ATCPIT100 timer support"
- depends on TIMER
+config X86_TSC_READ_BASE
+ bool "Read the TSC timer base on start-up"
+ depends on X86_TSC_TIMER
help
- Select this to enable a ATCPIT100 timer which will be embeded
- in AE3XX, AE250 boards.
+ 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 ROCKCHIP_TIMER
- bool "Rockchip timer support"
+config MTK_TIMER
+ bool "MediaTek timer support"
depends on TIMER
help
Select this to enable support for the timer found on
- Rockchip devices.
+ MediaTek devices.
endmenu
projects / oweals / u-boot.git / blobdiff