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https://github.com/AsahiLinux/u-boot
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The "Arm Ltd. Dual-Timer Module (SP804)" is a simple 32-bit count-down timer IP with interrupt functionality, and is used in some SoCs from various vendors. Add a simple DM compliant timer driver, to allow users of the SP804 to switch to DM_TIMER. This relies on the input clock to be accessible via the DM clock framework, which should be fine as we probably look at fixed-clock's here anyway. We re-program the control register in the probe() function, but keep the divider in place, in case this has been set to something on purpose before. The TRM for the timer IP can be found here: https://developer.arm.com/documentation/ddi0271/latest Signed-off-by: Andre Przywara <andre.przywara@arm.com>
314 lines
9.2 KiB
Text
314 lines
9.2 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 VPL_TIMER
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bool "Enable driver model for timer drivers in VPL"
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depends on TIMER && VPL
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default y if TPL_TIMER
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help
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Enable support for timer drivers in VPL. These can be used to get
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a timer value when in VPL, 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 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 ARM_TWD_TIMER
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bool "ARM timer watchdog (TWD) timer support"
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depends on TIMER && CLK
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help
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Select this to enable support for the ARM global timer watchdog timer.
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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 SPL_ATMEL_PIT_TIMER
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bool "Atmel periodic interval timer support in SPL"
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depends on SPL_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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Select this to be available in SPL.
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config ATMEL_TCB_TIMER
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bool "Atmel timer counter support"
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depends on TIMER
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depends on ARCH_AT91
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help
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Select this to enable the use of the timer counter as a monotonic
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counter.
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config SPL_ATMEL_TCB_TIMER
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bool "Atmel timer counter support in SPL"
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depends on SPL_TIMER
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depends on ARCH_AT91
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help
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Select this to enable the use of the timer counter as a monotonic
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counter in SPL.
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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 GXP_TIMER
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bool "HPE GXP Timer"
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depends on TIMER
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help
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Enables support for the GXP Timer driver. This timer is
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present on HPE GXP 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_FREQ
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int "x86 TSC timer frequency in Hz"
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depends on X86_TSC_TIMER
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default 1000000000
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help
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Sets the estimated CPU frequency in Hz 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 NPCM_TIMER
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bool "Nuvoton NPCM timer support"
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depends on TIMER
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help
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Select this to enable a timer on Nuvoton NPCM SoCs.
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NPCM timer module has 5 down-counting timers, only the first timer
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is used to implement timer ops. No support for early timer and
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boot timer.
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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 ORION_TIMER
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bool "Orion timer support"
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depends on TIMER
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default y if ARCH_KIRKWOOD || (ARCH_MVEBU && ARMADA_32BIT)
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select TIMER_EARLY if ARCH_MVEBU
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help
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Select this to enable an timer for Orion and Armada devices
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like Armada XP etc.
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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 ARM_GLOBAL_TIMER
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bool "ARM Cortex A9 global timer support"
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depends on TIMER
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depends on ARM
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default y if ARCH_STI
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help
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Select this to enable global timer found on ARM Cortex A9
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based devices.
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config SP804_TIMER
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bool "ARM SP804 timer support"
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depends on TIMER
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help
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ARM SP804 dual timer IP support
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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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config XILINX_TIMER
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bool "Xilinx timer support"
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depends on TIMER
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select REGMAP
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select SPL_REGMAP if SPL
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help
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Select this to enable support for the timer found on
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any Xilinx boards (axi timer).
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endmenu
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