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path: root/drivers/mailbox/tegra-hsp.c
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2022-05-21mailbox: tegra-hsp: Add 128-bit shared mailbox supportKartik1-3/+74
Add support for 128-bit shared mailboxes found on Tegra234 chips. Signed-off-by: Kartik <kkartik@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2022-05-21mailbox: tegra-hsp: Add tegra_hsp_sm_opsKartik1-27/+47
This patch introduces tegra_hsp_sm_ops to abstract send & receive API's for shared mailboxes. Signed-off-by: Kartik <kkartik@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2022-05-21mailbox: remove an unneeded NULL check on list iteratorXiaomeng Tong1-1/+1
The list iterator is always non-NULL so it doesn't need to be checked. Thus just remove the unnecessary NULL check. Signed-off-by: Xiaomeng Tong <xiam0nd.tong@gmail.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2022-03-12mailbox: tegra-hsp: Flush whole channelPekka Pessi1-0/+5
The txdone can re-fill the mailbox. Keep polling the mailbox during the flush until all the messages have been delivered. This fixes an issue with the Tegra Combined UART (TCU) where output can get truncated under high traffic load. Signed-off-by: Pekka Pessi <ppessi@nvidia.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Fixes: 91b1b1c3da8a ("mailbox: tegra-hsp: Add support for shared mailboxes") Cc: stable@vger.kernel.org Signed-off-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2021-02-14mailbox: tegra-hsp: Set lockdep class dynamicallyMikko Perttunen1-0/+15
On Tegra194, due to both BPMP and TCU using mailboxes, we get a lockdep spew at boot. Both are using different instances of HSP, so this is harmless. As such give each HSP instance a different lockdep class. Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2020-09-18firmware: tegra: Enable BPMP support on Tegra234Thierry Reding1-1/+8
Enable support for the BPMP on Tegra234 to avoid relying on Tegra194 being enabled to pull in the needed OF device ID table entry. On simulation platforms the BPMP hasn't booted up yet by the time we probe the BPMP driver and the BPMP hasn't had a chance to mark the doorbell as ringable by the CCPLEX. This corresponding check in the BPMP driver will therefore fail. Work around this by disabling the check on simulation platforms. Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
2019-11-12mailbox: tegra: Fix superfluous IRQ error messageJon Hunter1-2/+2
Commit 7723f4c5ecdb ("driver core: platform: Add an error message to platform_get_irq*()") added an error message to avoid drivers having to print an error message when IRQ lookup fails. However, there are some cases where IRQs are optional and so new optional versions of the platform_get_irq*() APIs have been added for these cases. The IRQs for Tegra HSP module are optional because not all instances of the module have the doorbell and all of the shared interrupts. Hence, since the above commit was applied the following error messages are now seen on Tegra194 ... ERR KERN tegra-hsp c150000.hsp: IRQ doorbell not found ERR KERN tegra-hsp c150000.hsp: IRQ shared0 not found The Tegra HSP driver deliberately does not fail if these are not found and so fix the above errors by updating the Tegra HSP driver to use the platform_get_irq_byname_optional() API. Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/20191011083459.11551-1-jonathanh@nvidia.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-10mailbox: tegra: avoid resume NULL mailboxesBitan Biswas1-4/+6
If Tegra HSP device tree does not have 'shared irqs', mailboxes pointer is NULL. Add non-NULL HSP mailboxes check in resume callback before tegra_hsp_mailbox_startup() call and prevent NULL pointer exception. Signed-off-by: Bitan Biswas <bbiswas@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2019-07-10mailbox: tegra: hsp: add noirq resumeBitan Biswas1-1/+9
Add noirq resume instead of resume callback for Tegra HSP. Tegra HSP resume needs tegra_hsp_doorbell_startup() call to fix timeout error for tegra_bpmp_transfer() during genpd resume noirq on Jetson TX2. Signed-off-by: Bitan Biswas <bbiswas@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2019-06-05treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288Thomas Gleixner1-9/+1
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 263 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.208660670@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-06mailbox: tegra-hsp: mark suspend function as __maybe_unusedArnd Bergmann1-1/+1
We get a warning about this being unused when CONFIG_PM is disabled: drivers/mailbox/tegra-hsp.c:782:12: error: 'tegra_hsp_resume' defined but not used [-Werror=unused-function] Fixes: 9a63f0f40599 ("mailbox: tegra-hsp: Add suspend/resume support") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2018-12-21mailbox: tegra-hsp: Use device-managed registration APIThierry Reding1-24/+6
In order to get rid of a lot of cleanup boilerplate code, use the device-managed registration API. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2018-12-21mailbox: tegra-hsp: use devm_kstrdup_const()Bartosz Golaszewski1-32/+4
Use devm_kstrdup_const() in the tegra-hsp driver. This mostly serves as an example of how to use this new routine to shrink driver code. Also use devm_kzalloc() instead of regular kzalloc() to shrink the driver even more. Doorbell objects are only removed in the driver's remove callback so it's safe to convert all memory allocations to devres. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2018-12-21mailbox: tegra-hsp: Add suspend/resume supportThierry Reding1-0/+19
Upon resuming from a system sleep state, the interrupts for all active shared mailboxes need to be reenabled, otherwise they will not work. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2018-12-21mailbox: tegra-hsp: Add support for shared mailboxesThierry Reding1-61/+443
The Tegra HSP block supports 'shared mailboxes' that are simple 32-bit registers consisting of a FULL bit in MSB position and 31 bits of data. The hardware can be configured to trigger interrupts when a mailbox is empty or full. Add support for these shared mailboxes to the HSP driver. The initial use for the mailboxes is the Tegra Combined UART. For this purpose, we use interrupts to receive data, and spinning to wait for the transmit mailbox to be emptied to minimize unnecessary overhead. Based on work by Mikko Perttunen <mperttunen@nvidia.com>. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-11-18mailbox: tegra-hsp: Use after free in tegra_hsp_remove_doorbells()Dan Carpenter1-2/+2
We have to use the _safe version of list_for_each() because we're freeing the pointer as we go along. (This might not show up testing depending on what config options you have enabled). Fixes: 0fe88461a0ec ("mailbox: Add Tegra HSP driver") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
2016-11-18mailbox: Add Tegra HSP driverThierry Reding1-0/+479
This driver exposes a mailbox interface for interprocessor communication using the Hardware Synchronization Primitives (HSP) module's doorbell mechanism. There are multiple HSP instances and they provide additional features such as shared mailboxes, shared and arbitrated semaphores. A driver for a remote processor can use the mailbox client provided by the HSP driver and build an IPC protocol on top of this synchronization mechanism. Based on work by Joseph Lo <josephl@nvidia.com>. Acked-by: Jassi Brar <jaswinder.singh@linaro.org> Signed-off-by: Thierry Reding <treding@nvidia.com>
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