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![Vlad Zakharov](/assets/img/avatar_default.png)
This commit introduces timer driver for ARC. ARC timers are configured via ARC AUX registers so we use special functions to access timer control registers. This driver allows utilization of either timer0 or timer1 depending on which one is available in real hardware. Essentially only existing timers should be mentioned in board's Device Tree description. Signed-off-by: Vlad Zakharov <vzakhar@synopsys.com> Reviewed-by: Simon Glass <sjg@chromium.org>
78 lines
2.4 KiB
Plaintext
78 lines
2.4 KiB
Plaintext
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 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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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 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 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 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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default y if 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 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 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 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 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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endmenu
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