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2016-11-14mailbox: PCC: Fix lockdep warning when request PCC channelHoan Tran1-6/+7
This patch fixes the lockdep warning below DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags)) ------------[ cut here ]------------ WARNING: CPU: 1 PID: 1 at linux-next/kernel/locking/lockdep.c:2876 lockdep_trace_alloc+0xe0/0xf0 Modules linked in: CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.8.0-11756-g86c5152 #46 ... Call trace: Exception stack(0xffff8007da837890 to 0xffff8007da8379c0) 7880: ffff8007da834000 0001000000000000 78a0: ffff8007da837a70 ffff0000081111a0 00000000600000c5 000000000000003d 78c0: 9374bc6a7f3c7832 0000000000381878 ffff000009db7ab8 000000000000002f 78e0: ffff00000811aabc ffff000008be2548 ffff8007da837990 ffff00000811adf8 7900: ffff8007da834000 00000000024080c0 00000000000000c0 ffff000009021000 7920: 0000000000000000 0000000000000000 ffff000008c8f7c8 ffff8007da579810 7940: 000000000000002f ffff8007da858000 0000000000000000 0000000000000001 7960: 0000000000000001 0000000000000000 ffff00000811a468 0000000000000002 7980: 656c62617369645f 0000000000038187 00000000000000ee ffff8007da837850 79a0: ffff000009db50c0 ffff000009db569d 0000000000000006 ffff000089db568f [<ffff0000081111a0>] lockdep_trace_alloc+0xe0/0xf0 [<ffff0000081f4950>] __kmalloc_track_caller+0x50/0x250 [<ffff00000857c088>] devres_alloc_node+0x28/0x60 [<ffff0000081220e0>] devm_request_threaded_irq+0x50/0xe0 [<ffff0000087e6220>] pcc_mbox_request_channel+0x110/0x170 [<ffff0000084b2660>] acpi_cppc_processor_probe+0x264/0x414 [<ffff0000084ae9f4>] __acpi_processor_start+0x28/0xa0 [<ffff0000084aeab0>] acpi_processor_start+0x44/0x54 [<ffff00000857897c>] driver_probe_device+0x1fc/0x2b0 [<ffff000008578ae4>] __driver_attach+0xb4/0xc0 [<ffff00000857683c>] bus_for_each_dev+0x5c/0xa0 [<ffff000008578110>] driver_attach+0x20/0x30 [<ffff000008577c20>] bus_add_driver+0x110/0x230 [<ffff000008579320>] driver_register+0x60/0x100 [<ffff000008d478b8>] acpi_processor_driver_init+0x2c/0xb0 [<ffff000008083168>] do_one_initcall+0x38/0x130 [<ffff000008d20d6c>] kernel_init_freeable+0x210/0x2b4 [<ffff000008945d90>] kernel_init+0x10/0x110 [<ffff000008082e80>] ret_from_fork+0x10/0x50 It's because the spinlock inside pcc_mbox_request_channel() is kept too long. This patch releases spinlock before request_irq() and free_irq() to fix this issue as spinlock is only needed to protect the channel data. Signed-off-by: Hoan Tran <hotran@apm.com> Reviewed-by: Prashanth Prakash <pprakash@codeaurora.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-10-06Merge branch 'mailbox-for-next' of ↵Linus Torvalds3-0/+217
git://git.linaro.org/landing-teams/working/fujitsu/integration Pull mailbox updates from Jussi Brar: "New driver and DT bindings for MHU controller integrated on Amlogic Meson platform" * 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration: dt-bindings: mailbox: Add Amlogic Meson MHU Bindings mailbox: Add Platform Message-Handling-Unit variant driver
2016-10-02Merge branches 'acpi-x86', 'acpi-cppc' and 'acpi-soc'Rafael J. Wysocki1-71/+245
* acpi-x86: x86: ACPI: make variable names clearer in acpi_parse_madt_lapic_entries() x86: ACPI: remove extraneous white space after semicolon * acpi-cppc: ACPI / CPPC: Support PCC with interrupt flag ACPI / CPPC: Add prefix cppc to cpudata structure name ACPI / CPPC: Add support for functional fixed hardware address ACPI / CPPC: Don't return on CPPC probe failure ACPI / CPPC: Allow build with ACPI_CPU_FREQ_PSS config ACPI / CPPC: check for error bit in PCC status field ACPI / CPPC: move all PCC related information into pcc_data ACPI / CPPC: add sysfs support to compute delivered performance ACPI / CPPC: set a non-zero value for transition_latency ACPI / CPPC: support for batching CPPC requests ACPI / CPPC: acquire pcc_lock only while accessing PCC subspace ACPI / CPPC: restructure read/writes for efficient sys mapped reg ops mailbox: pcc: Support HW-Reduced Communication Subspace type 2 * acpi-soc: ACPI / APD: constify local structures ACPI / APD: Add device HID for Vulcan SPI controller
2016-09-07mailbox: Add Platform Message-Handling-Unit variant driverNeil Armstrong3-0/+217
Add Message-Handling-Unit driver for platform variants as mailbox controller. Actually, only the Amlogic Meson GXBB SoC MHU is supported. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-08-31mailbox: pcc: Support HW-Reduced Communication Subspace type 2hotran1-71/+245
ACPI 6.1 has a PCC HW-Reduced Communication Subspace type 2 intended for use on HW-Reduce ACPI Platform, which requires read-modify-write sequence to acknowledge doorbell interrupt. This patch provides the implementation for the Communication Subspace Type 2. Signed-off-by: Hoan Tran <hotran@apm.com> Reviewed-by: Prashanth Prakash <pprakash@codeaurora.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-08-29fix:mailbox:bcm-pdc-mailbox:mark symbols static where possibleBaoyou Xie1-2/+2
We get 2 warnings when biuld kernel with W=1: drivers/mailbox/bcm-pdc-mailbox.c:472:6: warning: no previous prototype for 'pdc_setup_debugfs' [-Wmissing-prototypes] drivers/mailbox/bcm-pdc-mailbox.c:488:6: warning: no previous prototype for 'pdc_free_debugfs' [-Wmissing-prototypes] In fact, these functions are only used in the file in which they are declared and don't need a declaration, but can be made static. so this patch marks these functions with 'static'. Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-08-29mailbox: bcm-pdc: potential NULL dereference in pdc_shutdown()Dan Carpenter1-3/+4
We can't pass NULL pointers to pdc_ring_free() so I moved the check for NULL. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-08-29mailbox: Add HAS_DMA Kconfig dependency to BCM_PDC_MBOXRob Rice1-0/+1
Add HAS_DMA Kconfig dependency to BCM_PDC_MBOX to avoid link error on some platforms. Reported-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Rob Rice <rrice@broadcom.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-07-28mailbox: Fix format and type mismatches in Broadcom PDC driverRob Rice1-4/+4
Fix format and type mismatches in a couple debug prints in the Broadcom PDC driver. Use %pad for dma_addr_t and %pa for resource_size_t. Signed-off-by: Rob Rice <rob.rice@broadcom.com> Reported-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-07-28mailbox: Add Broadcom PDC mailbox driverRob Rice3-0/+1542
The Broadcom PDC mailbox driver is a mailbox controller that manages data transfers to and from one or more offload engines. Signed-off-by: Rob Rice <rob.rice@broadcom.com> Reviewed-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Ray Jui <ray.jui@broadcom.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-06-24mailbox: pl320: remove __raw IOBen Dooks1-23/+23
The use of __raw IO accesors is not endian safe and should be used sparingly. The relaxed variants should be as lightweight and also are endian safe. Note, this has not been run-time tested. Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-06-12mailbox: mailbox-test: set tdev->signal to NULL after freeingSudeep Holla1-0/+1
tdev->signal is not set NULL after it's freed. This will cause random exceptions when the stale pointer is accessed after tdev->signal is freed. Also, since tdev->signal allocation is skipped the next time it's written, this leads to continuous fault finally leading to the total death of the system. Fixes: d1c2f87c9a8f ("mailbox: mailbox-test: Prevent memory leak") Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-05-08mailbox: Fix devm_ioremap_resource error detection codeAmitoj Kaur Chawla1-2/+2
devm_ioremap_resource returns an ERR_PTR value, not NULL, on failure. The Coccinelle semantic patch used to make this change is as follows: @@ expression e,e1; statement S; @@ *e = devm_ioremap_resource(...); if (!e1) S Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26mailbox/omap: kill omap_mbox_{save/restore}_ctx() functionsSuman Anna1-51/+0
The omap_mbox_save_ctx() and omap_mbox_restore_ctx() API were previously provided to OMAP mailbox clients to save and restore the mailbox context during system suspend/resume. The save and restore functionality is now implemented through System PM driver callbacks, and there is no need for these functions, so kill these API. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26mailbox/omap: check for any unread messages during suspendSuman Anna1-1/+9
The OMAP mailbox driver is used by clients to communicate with remote processors in general. The mailbox clients are expected to have stopped communicating with these remote processors during a system suspend. The OMAP mailbox fifos are expected to not have any messages as such. Add a check for any pending unprocessed messages in the suspend callback, to detect any communication protocol issues of the mailbox clients. The system suspend is aborted if any messages are found. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26mailbox/omap: add support for suspend/resumeSuman Anna1-0/+45
Support has been added to the OMAP mailbox driver to allow it to work across a system suspend/resume. The OMAP mailbox driver requires only the interrupt configuration registers to be saved and restored, and this is done in the suspend/resume callbacks. The registers need to be saved only if there are active clients at the time of suspend. The enabling and disabling of the mailbox clocks is done automatically by the omap_device layer. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26mailbox/omap: store mailbox interrupt type in omap_mbox_deviceSuman Anna1-0/+2
The interrupt type used for identifying the layout of the interrupt configuration registers between OMAP4+ SoCs and older SoCs is stored only in the sub-mailbox structures for easier access. Store this type in the the omap_mbox_device structure as well along with the other global variables. This is being done to facilitate the context save and restore of appropriate registers during system suspend/resume. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26mailbox/omap: add blank lines after declarationsSuman Anna1-1/+6
Fix couple of checkpatch warnings of the type, "WARNING: Missing a blank line after declarations" Also, fixed a warning about a space after a typecast while at this. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26mailbox/omap: remove FSF mailing address paragraphSuman Anna1-6/+0
Remove the paragraph about writing to the Free Software Foundation's mailing address from the GPL license header as this address can change. This fixes the corresponding checkpatch warning. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26mailbox/omap: use variable name for sizeof() operatorSuman Anna1-1/+1
Fix the code formatting to use the kernel preferred style of using the actual variables to determize the size using the sizeof() operator. This fixes the corresponding checkpatch warning as well. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26mailbox/omap: drop legacy platform device supportSuman Anna1-60/+41
OMAP mailbox devices can no longer be created in legacy non-DT mode, all the relevant code has been cleaned up. The OMAP mailbox driver will only support devices created from DT going forward, so drop the legacy platform device support from the driver. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-14Merge branch 'mailbox-devel' of ↵Linus Torvalds3-11/+13
git://git.linaro.org/landing-teams/working/fujitsu/integration Pull mailbox fixes from Jussi Brar: "Misc fixes: mailbox-test driver: - prevent memory leak and another cosmetic change mailbox: - change the returned error code Xgene driver: - return -ENOMEM instead of PTR_ERR for failed devm_kzalloc" * 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration: mailbox: Stop using ENOSYS for anything other than unimplemented syscalls mailbox: mailbox-test: Prevent memory leak mailbox: mailbox-test: Use more consistent format for calling copy_from_user() mailbox: xgene-slimpro: Fix wrong test for devm_kzalloc
2016-04-12mailbox: Stop using ENOSYS for anything other than unimplemented syscallsLee Jones1-2/+2
In accordance with e15f431fe2d5 ("errno.h: Improve ENOSYS's comment") and 91c9afaf97ee ("checkpatch.pl: new instances of ENOSYS are errors") we're converting from the old meaning of: ENOSYS "Function not implemented" to a more standard EINVAL. Reported-by: Seraphin Bonnaffe <seraphin.bonnaffe@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-12mailbox: mailbox-test: Prevent memory leakLee Jones1-3/+6
If we set the Signal twice or more, without using it as part of a message, memory will be re-allocated and the pointer over-written. Prevent this potential leak by only allocating memory when there isn't any already. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-12mailbox: mailbox-test: Use more consistent format for calling copy_from_user()Lee Jones1-4/+3
While we're at it, ensure copy-to location is NULL'ed in the error path. Suggested-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-08Merge branches 'pm-cpufreq', 'pm-cpuidle' and 'acpi-cppc'Rafael J. Wysocki1-2/+2
* pm-cpufreq: cpufreq: dt: Drop stale comment cpufreq: intel_pstate: Documenation for structures cpufreq: intel_pstate: fix inconsistency in setting policy limits intel_pstate: Avoid extra invocation of intel_pstate_sample() intel_pstate: Do not set utilization update hook too early * pm-cpuidle: intel_idle: Add KBL support intel_idle: Add SKX support intel_idle: Clean up all registered devices on exit. intel_idle: Propagate hot plug errors. intel_idle: Don't overreact to a cpuidle registration failure. intel_idle: Setup the timer broadcast only on successful driver load. intel_idle: Avoid a double free of the per-CPU data. intel_idle: Fix dangling registration on error path. intel_idle: Fix deallocation order on the driver exit path. intel_idle: Remove redundant initialization calls. intel_idle: Fix a helper function's return value. intel_idle: remove useless return from void function. * acpi-cppc: mailbox: pcc: Don't access an unmapped memory address space
2016-04-08mailbox: xgene-slimpro: Fix wrong test for devm_kzallocAxel Lin1-2/+2
devm_kzalloc() returns NULL on failure. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-07mailbox: pcc: Don't access an unmapped memory address spaceShanker Donthineni1-2/+2
The acpi_pcc_probe() may end up accessing memory outside of the PCCT table space causing the kernel panic(). Increment the pcct_entry pointer after parsing 'HW-reduced Communications Subspace' to fix the problem. This change also enables the parsing of subtable at index 0. Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org> Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-03-23Merge branch 'mailbox-for-next' of ↵Linus Torvalds3-0/+652
git://git.linaro.org/landing-teams/working/fujitsu/integration Pull more mailbox updates from Jassi Brar: "Device tree bindings and driver for TI's Message-Manager controller. Due to some last minute cosmetic changes, the driver was not included in the first pull request, otherwise the driver has been reviewed twice" * 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration: mailbox: Introduce TI message manager driver Documentation: dt: mailbox: Add TI Message Manager
2016-03-21mailbox: Introduce TI message manager driverNishanth Menon3-0/+652
Support for TI Message Manager Module. This hardware block manages a bunch of hardware queues meant for communication between processor entities. Clients sitting on top of this would manage the required protocol for communicating with the counterpart entities. For more details on TI Message Manager hardware block, see documentation that will is available here: http://www.ti.com/lit/ug/spruhy8/spruhy8.pdf Chapter 8.1(Message Manager) Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-20Merge branch 'mailbox-for-next' of ↵Linus Torvalds6-22/+1025
git://git.linaro.org/landing-teams/working/fujitsu/integration Pull mailbox updates from Jassi Brar: - mailbox bindings and drivers for * APM X-Gene * Hisilicon Hi6220 * Rockchip RK3368 platforms - minor fixes to the above three drivers. - misc cleanups of mailbox-test driver. * 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration: mailbox: rockchip: avoid 64-bit division mailbox: rockchip: Add Rockchip mailbox driver dt-bindings: rockchip-mailbox: Add mailbox controller document on Rockchip SoCs mailbox/xgene-slimpro: Checking for IS_ERR instead of NULL mailbox: Hi6220: add mailbox driver dt-bindings: mailbox: Document Hi6220 mailbox driver mailbox: mailbox-test: add support for separate tx/rx buffer with single channel mailbox: mailbox-test: use print_hex_dump_bytes to allow dynamic printk mailbox: mailbox-test: fix the compatible string mailbox: mailbox-test: rename driver as generic test driver Documentation: mailbox: Add APM X-Gene SLIMpro mailbox dts documentation mailbox: Add support for APM X-Gene platform mailbox driver
2016-03-16mailbox: rockchip: avoid 64-bit divisionArnd Bergmann1-1/+1
The newly added rockchip mailbox driver causes a bug in the ARM allyesconfig build because of a division of a resource_size_t variable that may be 64 bit wide: drivers/mailbox/built-in.o: In function `rockchip_mbox_probe': :(.text+0x6614): undefined reference to `__aeabi_uldivmod' This adds a cast to size_t, which turns it into a 32-bit division in this case. This is safe because we know that we cannot possibly map a resource that is longer than what a pointer contains, and in practice it will be very short instead. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-14Merge branches 'acpi-processor' and 'acpi-cppc'Rafael J. Wysocki1-7/+104
* acpi-processor: ACPI / sleep: move acpi_processor_sleep to sleep.c ACPI / processor : add support for ACPI0010 processor container ACPI / processor_idle: replace PREFIX with pr_fmt * acpi-cppc: ACPI / CPPC: use MRTT/MPAR to decide if/when a req can be sent ACPI / CPPC: replace writeX/readX to PCC with relaxed version mailbox: pcc: optimized pcc_send_data ACPI / CPPC: optimized cpc_read and cpc_write ACPI / CPPC: Optimize PCC Read Write operations
2016-03-11mailbox: rockchip: Add Rockchip mailbox driverCaesar Wang3-0/+294
This driver is found on RK3368 SoCs. The Mailbox module is a simple APB peripheral that allows both the Cortex-A53 MCU system to communicate by writing operation to generate interrupt. The registers are accessible by both CPU via APB interface. The Mailbox has the following main features: 1) Support dual-core system: Cortex-A53 and MCU. 2) Support APB interface. 3) Support four mailbox elements, each element includes one data word, one command word register and one flag bit that can represent one interrupt. 4) Four interrupts to Cortex-A53. 5) Four interrupts to MCU. 6) Provide 32 lock registers for software to use to indicate whether mailbox is occupied. [Jassi: Removed unused variable buf_base] Signed-off-by: Caesar Wang <wxt@rock-chips.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-09mailbox: pcc: optimized pcc_send_dataPrakash, Prashanth1-7/+104
pcc_send_data() can be invoked during the execution of performance critical code as in cppc_cpufreq driver. With acpi_* APIs, the doorbell register accessed in pcc_send_data() if present in system memory will be searched (in cached virt to phys addr mapping), mapped, read/written and then unmapped. These operations take significant amount of time. This patch maps the performance critical doorbell register during init and then reads/writes to it directly using the mapped virtual address. This patch + similar changes to CPPC acpi driver reduce the time per freq. transition from around 200us to about 20us for the CPPC cpufreq driver Signed-off-by: Prashanth Prakash <pprakash@codeaurora.org> Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-03-04mailbox/xgene-slimpro: Checking for IS_ERR instead of NULLDan Carpenter1-2/+2
devm_ioremap() returns NULL, it never returns an ERR_PTR. Fixes: f700e84f417b ('mailbox: Add support for APM X-Gene platform mailbox driver') Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-04mailbox: Hi6220: add mailbox driverLeo Yan3-0/+405
Add driver for Hi6220 mailbox, the mailbox communicates with MCU; for sending data, it can support two methods for low level implementation: one is to use interrupt as acknowledge, another is automatic mode which without any acknowledge. These two methods have been supported in the driver. For receiving data, it will depend on the interrupt to notify the channel has incoming message. Now mailbox driver is used to send message to MCU to control dynamic voltage and frequency scaling for CPU, GPU and DDR. Signed-off-by: Leo Yan <leo.yan@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-04mailbox: mailbox-test: add support for separate tx/rx buffer with single channelSudeep Holla1-10/+21
This patch adds support for different MMIO region for Tx and Rx paths. If only one region is specified, it's assumed to be shared between Rx and Tx, thereby retaining backward compatibility. Also in order to support single channel dealing with both Tx and Rx with dedicated MMIO regions, Tx channel itself is assigned to Rx if MMIO regions are different and Rx is not specified. Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-04mailbox: mailbox-test: use print_hex_dump_bytes to allow dynamic printkSudeep Holla1-10/+8
Reduce the logging from info to debug. Also use print_hex_dump_bytes instead as it has support for dynamic printk providing options to conditionally enable/disable these logs. Cc: Lee Jones <lee.jones@linaro.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-04mailbox: mailbox-test: fix the compatible stringSudeep Holla1-1/+1
Underscores are usually forbidden in the compatible strings. So lets remove it before the first users of this is seen. Acked-by: Rob Herring <robh@kernel.org> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-04mailbox: mailbox-test: rename driver as generic test driverSudeep Holla1-1/+1
This mailbox-test driver was designed to be generic, so let's remove ST tag on it and make it generic. Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-02-15mailbox: Add support for APM X-Gene platform mailbox driverDuc Dang3-0/+295
X-Gene mailbox controller provides 8 mailbox channels, with each channel has a dedicated interrupt line. Signed-off-by: Feng Kan <fkan@apm.com> Signed-off-by: Duc Dang <dhdang@apm.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-02-02mailbox: Fix dependencies for !HAS_IOMEM archsRichard Weinberger1-0/+1
Not every arch has io memory. So, unbreak the build by fixing the dependencies. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-02-02mailbox: pcc: fix channel calculation in get_pcc_channel()Alexey Klimov1-7/+1
This patch fixes the calculation of pcc_chan for non-zero id. After the compiler ignores the (unsigned long) cast the pcc_mbox_channels pointer is type-cast and then the type-cast offset is added which results in address outside of the range leading to the kernel crashing. We might add braces and make it: pcc_chan = (struct mbox_chan *) ((unsigned long) pcc_mbox_channels + (id * sizeof(*pcc_chan))); but let's go with array approach here and use id as index. Tested on Juno board. Signed-off-by: Alexey Klimov <alexey.klimov@arm.com> Acked-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-11-30mailbox: constify mbox_chan_ops structureJulia Lawall1-1/+1
This mbox_chan_ops structure is never modified, so declare it as const, like all the other mbox_chan_ops structures. Done with the help of Coccinelle. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-11-04mailbox: mailbox-test: avoid reading iomem twiceJassi Brar1-3/+2
Don't pass mmio region as source to print_hex_dump() and then again to memcpy_fromio(). Do it once and give print_hex_dump() the buffer we just read the data in. Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-10-27mailbox: Off by one in mbox_test_message_read()Dan Carpenter1-1/+1
We need to leave space for the NUL char. Fixes: 8ea4484d0c2b ('mailbox: Add generic mechanism for testing Mailbox Controllers') Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
2015-10-23mailbox/omap: Add ti,mbox-send-noirq quirk to fix AM33xx CPU IdleDave Gerlach1-4/+45
The mailbox framework controls the transmission queue and requires either its controller implementations or clients to run the state machine for the Tx queue. The OMAP mailbox controller uses a Tx-ready interrupt as the equivalent of a Tx-done interrupt to run this Tx queue state-machine. The WkupM3 processor on AM33xx and AM43xx SoCs is used to offload certain PM tasks, like doing the necessary operations for Device PM suspend/resume or for entering lower c-states during cpuidle. The CPUIdle on AM33xx requires the messages to be sent without having to trigger the Tx-ready interrupts, as the interrupt would immediately terminate the CPUIdle operation. Support for this has been added by introducing a DT quirk, "ti,mbox-send-noirq" and using it to modify the normal OMAP mailbox controller behavior on the sub-mailboxes used to communicate with the WkupM3 remote processor. This also requires the wkup_m3_ipc driver to adjust its mailbox usage logic to run the Tx state machine. NOTE: - AM43xx does not communicate with WkupM3 for CPU Idle, so is not affected by this behavior. But, it uses the same IPC driver for PM suspend/resume functionality, so requires the quirk as well, because of changes to the common wkup_m3_ipc driver. Signed-off-by: Dave Gerlach <d-gerlach@ti.com> [s-anna@ti.com: revise logic and update comments/patch description] Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-10-23mailbox: mailbox-test: Correctly repair Sparse warningsLee Jones1-5/+6
Kbuild test robot reported some Sparse warnings to the tune of: sparse: incorrect type in argument 6 (different address spaces) expected void const *buf got void [noderef] <asn:2>*mmio This was due to passing variables tagged with the Sparse cookie '__iomem' through into memcpy() and print_hex_dump() without adequate protection or casting. These issues were fixed in a previous patch suppressing the warnings, but the issue is indeed still present. This patch fixes the warnings in the correct way, i.e. by using the purposely authored memcpy_{from,to}io() derivatives in the memcpy() case and casting the memory address to (void *) and forcing Sparse to ignore to ignore it in the print_hex_dump() case [NB: This is also what the memcpy() derivatives do]. Reported-by: Peter Griffin <peter.griffin@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-10-17mailbox: Fix a couple of trivial static checker issuesLee Jones2-6/+6
This patch deals with a few spelling, white space and type warnings reported by Intel's Kbuild Test Robot. Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
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