opensbi.git/include/sbi/sbi_timer.h, branch master

lib: sbi_timer: Introduce sbi_timer_compute_delta() and friends

2026-05-09T07:46:07Z

The users of timer event have to compute next_event (aka timer value in the future) based on desired units and unit frequency. Introduce sbi_timer_compute_delta() and friends to simplify computing next_event for timer event users. Signed-off-by: Anup Patel Reviewed-by: Nicholas Piggin Link: https://lore.kernel.org/r/20260425104048.2335262-5-anup.patel@oss.qualcomm.com Signed-off-by: Anup Patel

lib: sbi_timer: Add support for timer events

2026-05-09T07:46:05Z

Currently, the sbi_timer only supports timer events configured via SBI calls. Introduce struct sbi_timer_event and related functions to allow configuring timer events from any part of OpenSBI. Signed-off-by: Anup Patel Reviewed-by: Nicholas Piggin Link: https://lore.kernel.org/r/20260425104048.2335262-4-anup.patel@oss.qualcomm.com Signed-off-by: Anup Patel

lib: sbi_timer: Call driver warm_init from SBI core

2024-11-05T11:59:13Z

Currently, the platform's timer device is tracked in two places: the core SBI implementation has `timer_dev`, and the FDT timer layer has `current_driver`. The latter is used for warm initialization of the timer device. However, this warm init is not specific to FDT-based platforms; other platforms call exactly the same functions from the same point in the boot sequence. The code is simplified and made common across platforms by treating warm init and exit as properties of the driver, not the platform. Then the platform's only role is to select and prepare a driver during cold boot. For now, only add a .warm_init hook, since none of the existing drivers need an .exit hook. It could be added in the future if needed. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: sbi: Fix writes to emulated 32-bit htimedelta CSR

2024-09-20T16:22:06Z

Writes to the low half CSR should not affect the high half of the value. Make this separation explicit by writing to the delta in memory as two adjacent XLEN-sized values. Fixes: 1e9f88889f8b ("lib: Emulate HTIMEDELTA CSR for platforms not having TIME CSR") Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: sbi_timer: Added a conditional wait function which can timeout

2022-07-08T09:21:24Z

Motivation: Suppose a peripheral needs to be configured to transmit data. There is an SFR bit which indicates that the peripheral is ready to transmit. The firmware should check the bit and will only transmit data when the peripheral is ready. When the firmware starts polling the SFR, the peripheral could be busy transmitting/receiving other data so the firmware must wait till that completes. Assuming that there is no other way, the firmware shouldn't wait indefinitely. The function sbi_timer_waitms_until() will constantly check whether a certain condition is satisfied, or timeout occurs. It can be used for the cases when a timeout is required. Signed-off-by: Adnan Rahman Chowdhury Reviewed-by: Xiang W Reviewed-by: Anup Patel

lib: sbi: Add generic timer delay loop function

2021-09-26T14:22:15Z

We now have frequency of the timer device provided by the platform support so we can emulate desired delay using a loop where the number loop iterations are based on timer frequency. This patch provides sbi_timer_delay_loop() for above purpose. Signed-off-by: Anup Patel Reviewed-by: Bin Meng Reviewed-by: Xiang W

lib: sbi: Add timer frequency to struct sbi_timer_device

2021-09-26T14:22:10Z

Generic mdelay() and udelay() functions can be provided by the sbi_timer framework if timer frequency is available in the timer instance provided by the platform support or timer driver. This patch adds timer frequency (timer_freq) member in the struct sbi_timer_device for above purpose. Signed-off-by: Anup Patel Reviewed-by: Bin Meng Reviewed-by: Xiang W

lib: sbi: Simplify timer platform operations

2021-04-28T11:30:49Z

Instead of having timer_value(), timer_event_start(), and timer_event_stop() callbacks in platform operations, it will be much simpler for timer driver to directly register these operations as device to the sbi_timer implementation. Signed-off-by: Anup Patel Reviewed-by: Alistair Francis

include: sbi_timer: Remove scratch parameter from most funcitons

2020-03-28T08:02:55Z

This patch removes scratch parameter from most sbi_timer functions. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: Add timer exit API

2020-01-07T06:40:55Z

We add sbi_timer_exit() API for OpenSBI exit path handling in sbi_exit() implementation. Signed-off-by: Anup Patel Reviewed-by: Atish Patra