kernel/linux.git/drivers/hwspinlock/Kconfig, branch v6.6.131

hwspinlock: add sun6i hardware spinlock support

2021-05-28T03:19:42+00:00

Adds the sun6i_hwspinlock driver for the hardware spinlock unit found in most of the sun6i compatible SoCs. This unit provides at least 32 spinlocks in hardware. The implementation supports 32, 64, 128 or 256 32bit registers. A lock can be taken by reading a register and released by writing a 0 to it. This driver supports all 4 spinlock setups, but for now only the first setup (32 locks) seem to exist in available devices. This spinlock unit is shared between all ARM cores and the embedded companion core. All of them can take/release a lock with a single cycle operation. It can be used to sync access to devices shared by the ARM cores and the companion core. There are two ways to check if a lock is taken. The first way is to read a lock. If a 0 is returned, the lock was free and is taken now. If an 1 is returned, the caller has to try again. Which means the lock is taken. The second way is to read a 32bit wide status register where every bit represents one of the 32 first locks. According to the datasheets this status register supports only the 32 first locks. This is the reason the first way (lock read/write) approach is used to be able to cover all 256 locks in future devices. The driver also reports the amount of supported locks via debugfs. Reviewed-by: Samuel Holland Acked-by: Maxime Ripard Signed-off-by: Wilken Gottwalt Link: https://lore.kernel.org/r/bfd2b97307c2321b15c09683f4bd5e1fcc792f13.1615713499.git.wilken.gottwalt@posteo.net Signed-off-by: Bjorn Andersson

hwspinlock: remove sirf driver

2021-03-18T02:22:06+00:00

The CSR SiRF prima2/atlas platforms are getting removed, so this driver is no longer needed. Cc: Barry Song Link: https://lore.kernel.org/linux-arm-kernel/20210120124812.2800027-1-arnd@kernel.org/T/ Signed-off-by: Arnd Bergmann Link: https://lore.kernel.org/r/20210120132537.2285157-1-arnd@kernel.org Signed-off-by: Bjorn Andersson

hwspinlock: Simplify Kconfig

2020-06-21T07:36:03+00:00

Every hwspinlock driver is expected to depend on the hwspinlock core, so it's possible to simplify the Kconfig, factoring out the HWSPINLOCK dependency. Reviewed-by: Baolin Wang Signed-off-by: Ezequiel Garcia Link: https://lore.kernel.org/r/20200414220943.6203-1-ezequiel@collabora.com Signed-off-by: Bjorn Andersson

hwspinlock: Allow drivers to be built with COMPILE_TEST

2020-03-26T05:30:46+00:00

Allow drivers to be built with COMPILE_TEST. Signed-off-by: Baolin Wang Link: https://lore.kernel.org/r/5a95c3de07ef020a4e2f2776fa5adb00637ee387.1581324976.git.baolin.wang7@gmail.com Signed-off-by: Bjorn Andersson

hwspinlock/omap: Add support for TI K3 SoCs

2019-06-29T18:40:04+00:00

A HwSpinlock IP is also present on the newer TI K3 AM65x and J721E family of SoCs within the Main NavSS sub-module. Reuse the existing OMAP Hwspinlock driver to extend the support for this IP on K3 AM65x SoCs as well. The IP has slightly different bit-fields in the SYSCONFIG and SYSSTATUS registers. Signed-off-by: Suman Anna Signed-off-by: Bjorn Andersson

hwspinlock: add STM32 hwspinlock device

2018-12-05T20:45:21+00:00

This patch adds support of hardware semaphores for stm32mp1 SoC. The hardware block provides 32 semaphores. Signed-off-by: Benjamin Gaignard Signed-off-by: Benjamin Gaignard Signed-off-by: Bjorn Andersson

hwspinlock/core: Switch to SPDX license identifier

2018-05-24T19:04:32+00:00

Use the appropriate SPDX license identifier in the Hwspinlock core driver source files and drop the previous boilerplate license text. Signed-off-by: Suman Anna Signed-off-by: Bjorn Andersson

hwspinlock: Change hwspinlock to a bool

2017-11-07T05:59:34+00:00

Change hwspinlock to a bool in case some drivers will meet dependency issue when hwspinlock is built as a module. Signed-off-by: Baolin Wang Signed-off-by: Bjorn Andersson

hwspinlock: sprd: Add hardware spinlock driver

2017-05-17T17:52:52+00:00

The Spreadtrum hardware spinlock device can provide hardware assistance for synchronization between the multiple subsystems. Signed-off-by: Baolin Wang Signed-off-by: Bjorn Andersson

Make HWSPINLOCK a menuconfig to ease disabling

2017-05-17T17:32:14+00:00

So that there's no need to get into the submenu to disable all related config entries. Signed-off-by: Vincent Legoll Signed-off-by: Bjorn Andersson