mirror of
https://github.com/AsahiLinux/u-boot
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f8c8573b85
This timer driver uses GPT Timer (General Purpose Timer) available on a lot of i.MX SoCs family. This driver deals with both 24Mhz oscillator as well as peripheral clock. Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com> [Giulio: added the driver's stub and handled peripheral clock prescaler setting making driver to work correctly] Signed-off-by: Jesse Taube <mr.bossman075@gmail.com> [Jesse: added init, setting prescaler for 24Mhz support and enabling timer]
237 lines
7.1 KiB
Text
237 lines
7.1 KiB
Text
menu "Timer Support"
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config TIMER
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bool "Enable driver model for timer drivers"
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depends on DM
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help
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Enable driver model for timer access. It uses the same API as
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lib/time.c, but now implemented by the uclass. The first timer
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will be used. The timer is usually a 32 bits free-running up
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counter. There may be no real tick, and no timer interrupt.
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config SPL_TIMER
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bool "Enable driver model for timer drivers in SPL"
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depends on TIMER && SPL
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help
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Enable support for timer drivers in SPL. These can be used to get
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a timer value when in SPL, or perhaps for implementing a delay
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function. This enables the drivers in drivers/timer as part of an
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SPL build.
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config TPL_TIMER
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bool "Enable driver model for timer drivers in TPL"
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depends on TIMER && TPL
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help
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Enable support for timer drivers in TPL. These can be used to get
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a timer value when in TPL, or perhaps for implementing a delay
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function. This enables the drivers in drivers/timer as part of an
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TPL build.
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config TIMER_EARLY
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bool "Allow timer to be used early in U-Boot"
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depends on TIMER
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# initr_bootstage() requires a timer and is called before initr_dm()
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# so only the early timer is available
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default y if X86 && BOOTSTAGE
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help
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In some cases the timer must be accessible before driver model is
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active. Examples include when using CONFIG_TRACE to trace U-Boot's
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execution before driver model is set up. Enable this option to
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use an early timer. These functions must be supported by your timer
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driver: timer_early_get_count() and timer_early_get_rate().
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config AG101P_TIMER
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bool "AG101P timer support"
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depends on TIMER && NDS32
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help
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Select this to enable a timer for AG01P devices.
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config ALTERA_TIMER
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bool "Altera timer support"
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depends on TIMER
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help
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Select this to enable a timer for Altera devices. Please find
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details on the "Embedded Peripherals IP User Guide" of Altera.
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config ANDES_PLMT_TIMER
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bool
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depends on RISCV_MMODE || SPL_RISCV_MMODE
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help
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The Andes PLMT block holds memory-mapped mtime register
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associated with timer tick.
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config ARC_TIMER
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bool "ARC timer support"
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depends on TIMER && ARC && CLK
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help
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Select this to enable built-in ARC timers.
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ARC cores may have up to 2 built-in timers: timer0 and timer1,
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usually at least one of them exists. Either of them is supported
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in U-Boot.
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config AST_TIMER
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bool "Aspeed ast2400/ast2500 timer support"
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depends on TIMER
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default y if ARCH_ASPEED
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help
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Select this to enable timer for Aspeed ast2400/ast2500 devices.
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This is a simple sys timer driver, it is compatible with lib/time.c,
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but does not support any interrupts. Even though SoC has 8 hardware
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counters, they are all treated as a single device by this driver.
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This is mostly because they all share several registers which
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makes it difficult to completely separate them.
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config ATCPIT100_TIMER
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bool "ATCPIT100 timer support"
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depends on TIMER
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help
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Select this to enable a ATCPIT100 timer which will be embedded
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in AE3XX, AE250 boards.
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config ATMEL_PIT_TIMER
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bool "Atmel periodic interval timer support"
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depends on TIMER
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help
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Select this to enable a periodic interval timer for Atmel devices,
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it is designed to offer maximum accuracy and efficient management,
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even for systems with long response time.
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config CADENCE_TTC_TIMER
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bool "Cadence TTC (Triple Timer Counter)"
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depends on TIMER
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help
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Enables support for the cadence ttc driver. This driver is present
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on Xilinx Zynq and ZynqMP SoCs.
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config DESIGNWARE_APB_TIMER
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bool "Designware APB Timer"
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depends on TIMER
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help
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Enables support for the Designware APB Timer driver. This timer is
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present on Altera SoCFPGA SoCs.
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config MPC83XX_TIMER
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bool "MPC83xx timer support"
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depends on TIMER
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help
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Select this to enable support for the timer found on
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devices based on the MPC83xx family of SoCs.
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config RENESAS_OSTM_TIMER
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bool "Renesas RZ/A1 R7S72100 OSTM Timer"
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depends on TIMER
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help
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Enables support for the Renesas OSTM Timer driver.
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This timer is present on Renesas RZ/A1 R7S72100 SoCs.
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config X86_TSC_TIMER_EARLY_FREQ
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int "x86 TSC timer frequency in MHz when used as the early timer"
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depends on X86_TSC_TIMER
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default 1000
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help
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Sets the estimated CPU frequency in MHz when TSC is used as the
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early timer and the frequency can neither be calibrated via some
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hardware ways, nor got from device tree at the time when device
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tree is not available yet.
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config NOMADIK_MTU_TIMER
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bool "Nomadik MTU Timer"
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depends on TIMER
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help
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Enables support for the Nomadik Multi Timer Unit (MTU),
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used in ST-Ericsson Ux500 SoCs.
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The MTU provides 4 decrementing free-running timers.
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At the moment, only the first timer is used by the driver.
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config OMAP_TIMER
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bool "Omap timer support"
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depends on TIMER
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help
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Select this to enable an timer for Omap devices.
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config RISCV_TIMER
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bool "RISC-V timer support"
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depends on TIMER && RISCV
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help
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Select this to enable support for a generic RISC-V S-Mode timer
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driver.
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config ROCKCHIP_TIMER
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bool "Rockchip timer support"
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depends on TIMER
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help
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Select this to enable support for the timer found on
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Rockchip devices.
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config SANDBOX_TIMER
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bool "Sandbox timer support"
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depends on SANDBOX && TIMER
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help
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Select this to enable an emulated timer for sandbox. It gets
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time from host os.
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config STI_TIMER
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bool "STi timer support"
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depends on TIMER
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default y if ARCH_STI
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help
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Select this to enable a timer for STi devices.
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config STM32_TIMER
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bool "STM32 timer support"
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depends on TIMER
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help
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Select this to enable support for the timer found on
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STM32 devices.
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config X86_TSC_TIMER
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bool "x86 Time-Stamp Counter (TSC) timer support"
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depends on TIMER && X86
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help
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Select this to enable Time-Stamp Counter (TSC) timer for x86.
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config X86_TSC_READ_BASE
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bool "Read the TSC timer base on start-up"
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depends on X86_TSC_TIMER
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help
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On x86 platforms the TSC timer tick starts at the value 0 on reset.
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This it makes no sense to read the timer on boot and use that as the
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base, since we will miss some time taken to load U-Boot, etc. This
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delay is controlled by the SoC and we cannot reduce it, but for
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bootstage we want to record the time since reset as accurately as
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possible.
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The only exception is when U-Boot is used as a secondary bootloader,
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where this option should be enabled.
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config TPL_X86_TSC_TIMER_NATIVE
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bool "x86 TSC timer uses native calibration"
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depends on TPL && X86_TSC_TIMER
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help
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Selects native timer calibration for TPL and don't include the other
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methods in the code. This helps to reduce code size in TPL and works
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on fairly modern Intel chips. Code-size reductions is about 700
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bytes.
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config MTK_TIMER
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bool "MediaTek timer support"
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depends on TIMER
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help
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Select this to enable support for the timer found on
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MediaTek devices.
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config MCHP_PIT64B_TIMER
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bool "Microchip 64-bit periodic interval timer support"
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depends on TIMER
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help
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Select this to enable support for Microchip 64-bit periodic
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interval timer.
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config IMX_GPT_TIMER
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bool "NXP i.MX GPT timer support"
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depends on TIMER
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help
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Select this to enable support for the timer found on
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NXP i.MX devices.
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endmenu
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