- May 28, 2021
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Wilken Gottwalt authored
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 <samuel@sholland.org> Acked-by:
Maxime Ripard <maxime@cerno.tech> Signed-off-by:
Wilken Gottwalt <wilken.gottwalt@posteo.net> Link: https://lore.kernel.org/r/bfd2b97307c2321b15c09683f4bd5e1fcc792f13.1615713499.git.wilken.gottwalt@posteo.net Signed-off-by:
Bjorn Andersson <bjorn.andersson@linaro.org>
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- Mar 18, 2021
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Arnd Bergmann authored
The CSR SiRF prima2/atlas platforms are getting removed, so this driver is no longer needed. Cc: Barry Song <baohua@kernel.org> Link: https://lore.kernel.org/linux-arm-kernel/20210120124812.2800027-1-arnd@kernel.org/T/ Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20210120132537.2285157-1-arnd@kernel.org Signed-off-by:
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- Feb 09, 2021
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Suman Anna authored
The AM64x SoC contains a HwSpinlock IP instance in the MAIN domain, and is a minor variant of the IP on the current TI K3 SoCs such as AM64x, J721E or J7200 SoCs. The IP is not built with the K3 safety feature in hardware, and has slightly different integration into the overall SoC. Add the support for this IP through a new compatible. Signed-off-by:
Suman Anna <s-anna@ti.com> Link: https://lore.kernel.org/r/20210209172240.2305-3-s-anna@ti.com Signed-off-by:
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- Dec 10, 2020
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Baolin Wang authored
Remove the the redundant 'of_match_ptr' macro to fix below warning when the CONFIG_OF is not selected. All warnings: drivers/hwspinlock/sirf_hwspinlock.c:87:34: warning: unused variable 'sirf_hwpinlock_ids' [-Wunused-const-variable] Reported-by:
kernel test robot <lkp@intel.com> Signed-off-by:
Baolin Wang <baolin.wang7@gmail.com> Link: https://lore.kernel.org/r/250d35cb489c3c4c066f7ce256d27f36712a1979.1591618255.git.baolin.wang7@gmail.com Signed-off-by:
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- Nov 18, 2020
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Chunyan Zhang authored
The macro function of_match_ptr() is NULL if CONFIG_OF is not set, in this case Clang compiler would complain the of_device_id variable is unused. Reviewed-by:
Chunyan Zhang <chunyan.zhang@unisoc.com> Link: https://lore.kernel.org/r/20201112070410.14810-1-zhang.lyra@gmail.com Signed-off-by:
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- Nov 03, 2020
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Chunyan Zhang authored
The hardware spinlock devices are defined in the DT, there's no need for init calls order, remove boilerplate code by using module_platform_driver. Reviewed-by:
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- Oct 26, 2020
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Baolin Wang authored
Remove redundant header files. Signed-off-by:
Baolin Wang <baolin.wang@linux.alibaba.com> Link: https://lore.kernel.org/r/1590991552-93643-1-git-send-email-baolin.wang@linux.alibaba.com Signed-off-by:
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- Jul 14, 2020
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Bjorn Andersson authored
In modern Qualcomm platforms the mutex region of the TCSR is forked off into its own block, all with a offset of 0 and stride of 4096, and in some of these platforms no other registers in this region is accessed from Linux. So add support for directly memory mapping this register space, to avoid the need to represent this block using a syscon. Reviewed-by:
Vinod Koul <vkoul@kernel.org> Signed-off-by:
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- Jun 21, 2020
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Ezequiel Garcia authoredEvery 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:
Ezequiel Garcia <ezequiel@collabora.com> Link: https://lore.kernel.org/r/20200414220943.6203-1-ezequiel@collabora.com Signed-off-by:
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- Mar 26, 2020
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Gustavo A. R. Silva authored
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732 ("cxgb3/l2t: Fix undefined behaviour") Reviewed-by:Gustavo A. R. Silva <gustavo@embeddedor.com> Link: https://lore.kernel.org/r/20200319213839.GA10669@embeddedor.com Signed-off-by:
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Baolin Wang authored
Allow drivers to be built with COMPILE_TEST. Signed-off-by:
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- Jan 22, 2020
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Baolin Wang authored
Use devm_hwspin_lock_register() to register the hwlock controller instead of unregistering the hwlock controller explicitly when removing the device. Signed-off-by:
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Baolin Wang authored
Since the hwspinlock core has changed the PM runtime to be optional, and the SIRF hardware spinlock has no pm runtime requirement, thus remove these redundant PM runtime functions. Signed-off-by:
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Baolin Wang authored
Use the new helper that wraps the calls to platform_get_resource() and devm_ioremap_resource() together, which can simpify the code. Signed-off-by:
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Baolin Wang authored
Use devm_kzalloc() to allocate memory, which can simplify the error handling. Signed-off-by:
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Baolin Wang authored
Use the new helper that wraps the calls to platform_get_resource() and devm_ioremap_resource() together, which can simpify the code. Meanwhile renaming the error label to make more sense after removing iounmap(). Signed-off-by:
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Baolin Wang authored
Use devm_hwspin_lock_register() to register the hwlock controller instead of unregistering the hwlock controller explicitly when removing the device. Signed-off-by:
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Baolin Wang authored
Since the hwspinlock core has changed the PM runtime to be optional, and the Qualcomm hardware spinlock has no pm runtime requirement, thus remove these redundant PM runtime functions. Signed-off-by:
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- Dec 29, 2019
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Yangtao Li authored
Use devm_platform_ioremap_resource() to simplify code. Signed-off-by:
Yangtao Li <tiny.windzz@gmail.com> Link: https://lore.kernel.org/r/20191228191541.26999-1-tiny.windzz@gmail.com Signed-off-by:
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- Nov 09, 2019
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Baolin Wang authored
Since the hwspinlock core has changed the PM runtime to be optional, thus remove the redundant PM runtime implementation in the u8500 HWSEM driver. Reviewed-by:
Linus Walleij <linus.walleij@linaro.org> Signed-off-by:
Baolin Wang <baolin.wang@linaro.org> Signed-off-by:
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Baolin Wang authored
Since the hwspinlock core has changed the PM runtime to be optional, thus remove the redundant PM runtime implementation in the Spreadtrum hwlock driver. Signed-off-by:
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Baolin Wang authored
Now some hwspinlock controllers did not have the requirement to implement the PM runtime, but drivers must enable the PM runtime to comply with the hwspinlock core. Thus we can change the PM runtime support to be optional by validating the -EACCES error number which means the PM runtime is not enabled, and removing the return value validating of pm_runtime_put(). So that we can remove some redundant PM runtime code in drivers. Signed-off-by:
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Baolin Wang authored
The original code use BUG_ON() to validate the parameters when locking or unlocking one hardware lock, but we should not crash the whole kernel though the hwlock parameters are incorrect, instead we can return the error number for users and give some warning. Signed-off-by:
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- Oct 05, 2019
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Baolin Wang authored
Use devm_hwspin_lock_register() to register the hwlock controller instead of unregistering the hwlock controller explicitly when removing the device. Signed-off-by:
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Baolin Wang authored
Use devm_add_action_or_reset() for calls to clk_disable_unprepare(), which can simplify the error handling. Signed-off-by:
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Baolin Wang authored
We must check the return value of clk_prepare_enable() to make sure the hardware spinlock controller can be enabled successfully, otherwise we should return error. Signed-off-by:
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Baolin Wang authored
Use the new helper that wraps the calls to platform_get_resource() and devm_ioremap_resource() together, which can simpify the code. Signed-off-by:
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Baolin Wang authored
Use devm_hwspin_lock_register() to register the hwlock controller instead of unregistering the hwlock controller explicitly when removing the device. Reviewed-by:
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Baolin Wang authored
Use devm_kzalloc() to allocate memory. Reviewed-by:
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Baolin Wang authored
Use the new helper that wraps the calls to platform_get_resource() and devm_ioremap_resource() together, which can simpify the code. Reviewed-by:
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- Jun 30, 2019
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Fabien Dessenne authored
Add the 'in_atomic' mode which can be called from an atomic context. This mode relies on the existing 'raw' mode (no lock, no preemption/irq disabling) with the difference that the timeout is not based on jiffies (jiffies won't increase when irq are disabled) but handled with busy-waiting udelay() calls. Signed-off-by:
Fabien Dessenne <fabien.dessenne@st.com> Signed-off-by:
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Fabien Dessenne authored
Implement this optional ops, called by hwspinlock core while spinning on a lock, between two successive invocations of trylock(). Reviewed-by:
Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by:
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- Jun 29, 2019
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Fabien Dessenne authored
Do not wait for hwspinlock device registration if it is not available for use. Acked-by:
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Suman Anna authored
Add a debug level trace statement in the OMAP HwSpinlock driver probe function to print the number of hwlocks on a successful registration. Signed-off-by:
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Suman Anna authored
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:
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- Jan 03, 2019
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Wei Yongjun authored
In case of error, the function devm_ioremap_resource() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). Fixes: f24fcff1 ("hwspinlock: add STM32 hwspinlock device") Acked-by:
Benjamin Gaignard <benjamin.gaignard@gmail.com> Signed-off-by:
Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by:
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- Dec 05, 2018
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Benjamin Gaignard authored
This patch adds support of hardware semaphores for stm32mp1 SoC. The hardware block provides 32 semaphores. Signed-off-by:
Benjamin Gaignard <benjamin.gaignard@linaro.org> Signed-off-by:
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- Jul 31, 2018
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Baolin Wang authored
The commit 4f1acd75 ("hwspinlock: Add devm_xxx() APIs to request/free hwlock") introduces one bug, that will return one error pointer if failed to request one hwlock, but we expect NULL pointer on error for consumers. This patch will fix this issue. Reported-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
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- Jun 26, 2018
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Baolin Wang authored
Fix one comment mistake with correct function names. Signed-off-by:
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Baolin Wang authored
This patch introduces devm_hwspin_lock_register() and devm_hwspin_lock_unregister() interfaces to help to register or unregister one hardware spinlock controller, that will help to simplify the cleanup code for hwspinlock drivers. Signed-off-by:
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