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Christopher Bostic [Tue, 6 Jun 2017 21:08:59 +0000 (16:08 -0500)]
drivers/fsi: Add module license to core driver
Add missing MODULE_LICENSE("GPL") to the core FSI driver.
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:58 +0000 (16:08 -0500)]
drivers/fsi: Use asynchronous slave mode
For slaves that are behind a software-clocked master, we want FSI CFAMs
to run asynchronously to the FSI clock, so set up our slaves to be in
async mode.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Christopher Bostic [Tue, 6 Jun 2017 21:08:57 +0000 (16:08 -0500)]
drivers/fsi: Add hub master support
Add an engine driver to expose a "hub" FSI master - which has a set of
control registers in the engine address space, and uses a chunk of the
slave address space for actual FSI communication.
Additional changes from Jeremy Kerr <jk@ozlabs.org>.
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Christopher Bostic [Tue, 6 Jun 2017 21:08:56 +0000 (16:08 -0500)]
drivers/fsi: Add SCOM FSI client device driver
Create a simple SCOM engine device driver that reads and writes
its control registers via an FSI bus.
Includes changes from Edward A. James <eajames@us.ibm.com>.
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Edward A. James <eajames@us.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:55 +0000 (16:08 -0500)]
drivers/fsi/gpio: Add tracepoints for GPIO master
Trace low level input/output GPIO operations.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Christopher Bostic [Tue, 6 Jun 2017 21:08:54 +0000 (16:08 -0500)]
drivers/fsi: Add GPIO based FSI master
Implement a FSI master using GPIO. Will generate FSI protocol for
read and write commands to particular addresses. Sends master command
and waits for and decodes a slave response.
Includes changes from Edward A. James <eajames@us.ibm.com> and Jeremy
Kerr <jk@ozlabs.org>.
Signed-off-by: Edward A. James <eajames@us.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Christopher Bostic [Tue, 6 Jun 2017 21:08:53 +0000 (16:08 -0500)]
drivers/fsi: Document FSI master sysfs files in ABI
Add info for sysfs scan file in Documentaiton ABI/testing
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:52 +0000 (16:08 -0500)]
drivers/fsi: Add error handling for slave
This change implements error handling in the FSI core, by cleaining up
and retrying failed operations, using the SISC, TERM and BREAK
facilities.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:51 +0000 (16:08 -0500)]
drivers/fsi: Add tracepoints for low-level operations
Trace low level read and write FSI bus operations.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:50 +0000 (16:08 -0500)]
drivers/fsi: expose direct-access slave API
Allow drivers to access the slave address ranges.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:49 +0000 (16:08 -0500)]
drivers/fsi: Add sysfs files for FSI master & slave accesses
This change adds a 'raw' file for reads & writes, and a 'term' file for
the TERM command, and a 'break' file for issuing a BREAK.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Christopher Bostic [Tue, 6 Jun 2017 21:08:48 +0000 (16:08 -0500)]
drivers/fsi: Add client driver register utilities
Add driver_register and driver_unregister wrappers for FSI.
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Christopher Bostic [Tue, 6 Jun 2017 21:08:47 +0000 (16:08 -0500)]
drivers/fsi: Add documentation for GPIO bindings
Add fsi master gpio device tree binding documentation.
Includes changes from Jeremy Kerr <jk@ozlabs.org>.
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Christopher Bostic [Tue, 6 Jun 2017 21:08:46 +0000 (16:08 -0500)]
drivers/fsi: Add master unscan
Allow a master to undo a previous scan. Should a master scan a bus
twice it will need to ensure it doesn't double register any
previously detected device.
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
----
v7 - Unscan when unregistering master
- Remove leading '__'s from function names
- Return fail state for sysfs rescan file
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:45 +0000 (16:08 -0500)]
drivers/fsi: Add device read/write/peek API
This change introduces the fsi device API: simple read, write and peek
accessors for the devices' address spaces.
Includes contributions from Christopher Bostic
<cbostic@linux.vnet.ibm.com> and Edward A. James <eajames@us.ibm.com>.
Signed-off-by: Edward A. James <eajames@us.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:44 +0000 (16:08 -0500)]
drivers/fsi: scan slaves & register devices
Now that we have fsi_slave devices, scan each for endpoints, and
register them on the fsi bus.
Includes contributions from Christopher Bostic
<cbostic@linux.vnet.ibm.com>.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Christopher Bostic [Tue, 6 Jun 2017 21:08:43 +0000 (16:08 -0500)]
drivers/fsi: Set slave SMODE to init communication
Set CFAM to appropriate ID so that the controlling master can manage
link memory ranges. Add slave engine register definitions.
Includes changes from Jeremy Kerr <jk@ozlabs.org>.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:42 +0000 (16:08 -0500)]
drivers/fsi: Implement slave initialisation
Implement fsi_slave_init: if we can read a chip ID, create fsi_slave
devices and register with the driver core.
Includes changes from Christopher Bostic <cbostic@linux.vnet.ibm.com>.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Christopher Bostic [Tue, 6 Jun 2017 21:08:41 +0000 (16:08 -0500)]
drivers/fsi: Set up links for slave communication
Enable each link and send a break command, and try to detect a slave by
reading from the SMODE register.
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:40 +0000 (16:08 -0500)]
drivers/fsi: Add slave & master read/write APIs
Introduce functions to perform reads/writes on the slave address space;
these simply pass the request on the slave's master with the correct
link and slave ID.
We implement these on top of similar helpers for the master.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:39 +0000 (16:08 -0500)]
lib: Add crc4 module
Add a little helper for crc4 calculations. This works 4-bits-at-a-time,
using a simple table approach.
We will need this in the FSI core code, as well as any master
implementations that need to calculate CRCs in software.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:38 +0000 (16:08 -0500)]
drivers/fsi: Add empty master scan
When a new fsi master is added, we will need to scan its links, and
slaves attached to those links. This change introduces a little shell to
iterate the links, which we will populate with the actual slave scan in
a later change.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:37 +0000 (16:08 -0500)]
drivers/fsi: Add slave definition
Add the initial fsi slave device, which is private to the core code.
This will be a child of the master, and parent to endpoint devices.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeremy Kerr [Tue, 6 Jun 2017 21:08:36 +0000 (16:08 -0500)]
drivers/fsi: Add fsi master definition
Add a `struct fsi_master` to represent a FSI master controller.
FSI master drivers register one of these structs to provide
device-specific of the standard operations: read/write/term/break and
link control.
Includes changes from Edward A. James <eajames@us.ibm.com> & Jeremy Kerr
<jk@ozlabs.org>.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Roberto Pereira [Thu, 8 Jun 2017 12:39:16 +0000 (18:09 +0530)]
config: android-base: disable CONFIG_NFSD and CONFIG_NFS_FS
Disable Network file system support.
Reviewed-at: https://android-review.googlesource.com/#/c/409559/
Signed-off-by: Roberto Pereira <rpere@google.com>
[AmitP: cherry-picked this change from Android common kernel
and updated commit message]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Chenbo Feng [Thu, 8 Jun 2017 12:39:15 +0000 (18:09 +0530)]
config: android-base: add CGROUP_BPF
Add CONFIG_CGROUP_BPF as a default configuration in android base config
since it is used to replace XT_QTAGUID in future.
Reviewed-at: https://android-review.googlesource.com/#/c/400374/
Signed-off-by: Chenbo Feng <fengc@google.com>
[AmitP: cherry-picked this change from Android common kernel]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Greg Kroah-Hartman [Thu, 8 Jun 2017 12:39:14 +0000 (18:09 +0530)]
config: android-base: add CONFIG_MODULES option
This adds CONFIG_MODULES, CONFIG_MODULE_UNLOAD, and CONFIG_MODVERSIONS
which are required by the O release.
Reviewed-at: https://android-review.googlesource.com/#/c/364554/
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
[AmitP: cherry-picked this change from Android common kernel]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Greg Kroah-Hartman [Thu, 8 Jun 2017 12:39:13 +0000 (18:09 +0530)]
config: android-base: add CONFIG_IKCONFIG option
This adds CONFIG_IKCONFIG and CONFIG_IKCONFIG_PROC options, which are a
requirement for the O release.
Reviewed-at: https://android-review.googlesource.com/#/c/364553/
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
[AmitP: cherry-picked this change from Android common kernel]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Sami Tolvanen [Thu, 8 Jun 2017 12:39:12 +0000 (18:09 +0530)]
config: android-recommended: enable CONFIG_CPU_SW_DOMAIN_PAN
Enable CPU domain PAN to ensure that normal kernel accesses are
unable to access userspace addresses.
Reviewed-at: https://android-review.googlesource.com/#/c/334035/
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
[AmitP: cherry-picked this change from Android common kernel, updated
the commit message and re-placed the CONFIG_STRICT_KERNEL_RWX
config in sorted order]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Max Shi [Thu, 8 Jun 2017 12:39:11 +0000 (18:09 +0530)]
config: android-base: disable CONFIG_USELIB and CONFIG_FHANDLE
Turn off the two kernel configs to disable related system ABI.
Reviewed-at: https://android-review.googlesource.com/#/c/264976/
Signed-off-by: Max Shi <meixuanshi@google.com>
[AmitP: cherry-picked this change from Android common kernel]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Sami Tolvanen [Thu, 8 Jun 2017 12:39:10 +0000 (18:09 +0530)]
config: android-recommended: enable CONFIG_ARM64_SW_TTBR0_PAN
Enable PAN emulation using TTBR0_EL1 switching.
Reviewed-at: https://android-review.googlesource.com/#/c/325997/
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
[AmitP: cherry-picked this change from Android common kernel
and updated the commit message]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeff Vander Stoep [Thu, 8 Jun 2017 12:39:09 +0000 (18:09 +0530)]
config: android-recommended: enable fstack-protector-strong
If compiler has stack protector support, set
CONFIG_CC_STACKPROTECTOR_STRONG.
Reviewed-at: https://android-review.googlesource.com/#/c/238388/
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
[AmitP: cherry-picked this change from Android common kernel]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Leo Yan [Mon, 5 Jun 2017 20:15:18 +0000 (14:15 -0600)]
arm64: dts: qcom: msm8916: Add debug unit
Add debug unit on Qualcomm msm8916 based platforms, including the
DragonBoard 410c board.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Acked-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Leo Yan [Mon, 5 Jun 2017 20:15:17 +0000 (14:15 -0600)]
arm64: dts: hi6220: register debug module
Bind debug module driver for Hi6220.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Acked-by: Wei Xu <xuwei5@hisilicon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Leo Yan [Mon, 5 Jun 2017 20:15:16 +0000 (14:15 -0600)]
coresight: add support for CPU debug module
Coresight includes debug module and usually the module connects with CPU
debug logic. ARMv8 architecture reference manual (ARM DDI 0487A.k) has
description for related info in "Part H: External Debug".
Chapter H7 "The Sample-based Profiling Extension" introduces several
sampling registers, e.g. we can check program counter value with
combined CPU exception level, secure state, etc. So this is helpful for
analysis CPU lockup scenarios, e.g. if one CPU has run into infinite
loop with IRQ disabled. In this case the CPU cannot switch context and
handle any interrupt (including IPIs), as the result it cannot handle
SMP call for stack dump.
This patch is to enable coresight debug module, so firstly this driver
is to bind apb clock for debug module and this is to ensure the debug
module can be accessed from program or external debugger. And the driver
uses sample-based registers for debug purpose, e.g. when system triggers
panic, the driver will dump program counter and combined context
registers (EDCIDSR, EDVIDSR); by parsing context registers so can
quickly get to know CPU secure state, exception level, etc.
Some of the debug module registers are located in CPU power domain, so
this requires the CPU power domain stays on when access related debug
registers, but the power management for CPU power domain is quite
dependent on SoC integration for power management. For the platforms
which with sane power controller implementations, this driver follows
the method to set EDPRCR to try to pull the CPU out of low power state
and then set 'no power down request' bit so the CPU has no chance to
lose power.
If the SoC has not followed up this design well for power management
controller, the user should use the command line parameter or sysfs
to constrain all or partial idle states to ensure the CPU power
domain is enabled and access coresight CPU debug component safely.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Leo Yan [Mon, 5 Jun 2017 20:15:15 +0000 (14:15 -0600)]
coresight: refactor with function of_coresight_get_cpu
This is refactor to add function of_coresight_get_cpu(), so it's used to
retrieve CPU id for coresight component. Finally can use it as a common
function for multiple places.
Suggested-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suzuki K Poulose [Mon, 5 Jun 2017 20:15:14 +0000 (14:15 -0600)]
coresight: of_get_coresight_platform_data: Add missing of_node_put
The of_get_coresight_platform_data iterates over the possible CPU nodes
to find a given cpu phandle. However it does not drop the reference
to the node pointer returned by the of_get_coresight_platform_data.
This patch also introduces another minor fix is to use
of_cpu_device_node_get() to replace of_get_cpu_node().
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
[Leo: minor tweaks for of_get_coresight_platform_data]
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Leo Yan [Mon, 5 Jun 2017 20:15:13 +0000 (14:15 -0600)]
MAINTAINERS: update file entries for Coresight subsystem
Update document file entries for Coresight debug module.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Leo Yan [Mon, 5 Jun 2017 20:15:12 +0000 (14:15 -0600)]
doc: Add coresight_cpu_debug.enable to kernel-parameters.txt
Add coresight_cpu_debug.enable to kernel-parameters.txt, this flag is
used to enable/disable the CPU sampling based debugging.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Leo Yan [Mon, 5 Jun 2017 20:15:11 +0000 (14:15 -0600)]
doc: Add documentation for Coresight CPU debug
Add detailed documentation for Coresight CPU debug driver, which
contains the info for driver implementation, Mike Leach excellent
summary for "clock and power domain". At the end some examples on how
to enable the debugging functionality are provided.
Suggested-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Leo Yan [Mon, 5 Jun 2017 20:15:10 +0000 (14:15 -0600)]
coresight: bindings for CPU debug module
According to ARMv8 architecture reference manual (ARM DDI 0487A.k)
Chapter 'Part H: External debug', the CPU can integrate debug module
and it can support self-hosted debug and external debug. Especially
for supporting self-hosted debug, this means the program can access
the debug module from mmio region; and usually the mmio region is
integrated with coresight.
So add document for binding debug component, includes binding to APB
clock; and also need specify the CPU node which the debug module is
dedicated to specific CPU.
Suggested-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Robin Murphy [Mon, 5 Jun 2017 20:15:09 +0000 (14:15 -0600)]
coresight: tmc: Configure DMA mask appropriately
Before making any DMA API calls, the ETR driver should really be setting
its masks to ensure that DMA is possible. Especially since it can
address more than the 32-bit default mask set by the AMBA bus code.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Markus Elfring [Mon, 5 Jun 2017 20:15:08 +0000 (14:15 -0600)]
coresight: etb10: Fix a typo in a comment line
Delete a character in this description for a condition check.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Markus Elfring [Mon, 5 Jun 2017 20:15:07 +0000 (14:15 -0600)]
coresight: etb10: Delete an error message for a failed memory allocation in etb_probe()
Omit an extra message for a memory allocation failure in this function.
This issue was detected by using the Coccinelle software.
Link: http://events.linuxfoundation.org/sites/events/files/slides/LCJ16-Refactor_Strings-WSang_0.pdf
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Leo Yan [Mon, 5 Jun 2017 20:15:06 +0000 (14:15 -0600)]
coresight: use const for device_node structures
Almost low level functions from open firmware have used const to
qualify device_node structures, so add const for device_node
parameters in of_coresight related functions.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Leo Yan [Mon, 5 Jun 2017 20:15:05 +0000 (14:15 -0600)]
coresight: tmc: minor fix for output log
In current code the output logs are not well symmetric for sink and link
enabling and disabling. This patch is to fix that so can output paired
logs.
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suzuki K Poulose [Mon, 5 Jun 2017 20:15:04 +0000 (14:15 -0600)]
coresight: etm_perf: Fix using uninitialised work
With 4.11-rc4, the following command triggers a WARN_ON,
when a sink is not enabled.
perf record -e cs_etm/@
20010000.etf/
[88286.547741] ------------[ cut here ]------------
[88286.552332] WARNING: CPU: 3 PID: 2156 at kernel/workqueue.c:1442 __queue_work+0x29c/0x3b8
[88286.560427] Modules linked in:
[88286.563451]
[88286.564928] CPU: 3 PID: 2156 Comm: perf_v4.11 Not tainted 4.11.0-rc4 #217
[88286.573453] Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Aug 15
2016
[88286.584128] task:
ffff80097597c200 task.stack:
ffff8009768b0000
[88286.589990] PC is at __queue_work+0x29c/0x3b8
[88286.594303] LR is at __queue_work+0x104/0x3b8
[88286.598614] pc : [<
ffff0000080d8c7c>] lr : [<
ffff0000080d8ae4>] pstate:
a00001c5
[88286.605934] sp :
ffff8009768b3aa0
[88286.609212] x29:
ffff8009768b3aa0 x28:
ffff80097ff3da00
[88286.614477] x27:
ffff80097ff89c00 x26:
ffff8009751b0e00
[88286.619741] x25:
ffff000008c9f000 x24:
0000000000000003
[88286.625004] x23:
0000000000000040 x22:
ffff000008d3dab8
[88286.630268] x21:
ffff800977804400 x20:
0000000000000007
[88286.635532] x19:
ffff000008c54000 x18:
0000fffff9185160
[88286.640795] x17:
0000ffffb33d9a38 x16:
ffff000008088270
[88286.646059] x15:
0000ffffb345b590 x14:
0000000000000000
[88286.651322] x13:
0000000000000004 x12:
0000000000000040
[88286.656586] x11:
0000000000000068 x10:
0000000000000000
[88286.661849] x9 :
ffff800977400028 x8 :
0000000000000000
[88286.667113] x7 :
0000000000000000 x6 :
ffff0000080d8ae4
[88286.672376] x5 :
0000000000000000 x4 :
0000000000000080
[88286.677639] x3 :
0000000000000000 x2 :
0000000000000000
[88286.682903] x1 :
0000000000000000 x0 :
ffff8009751b0e08
[88286.688166]
[88286.689638] ---[ end trace
31633f18fd33d4cb ]---
[88286.694206] Call trace:
[88286.696627] Exception stack(0xffff8009768b38d0 to 0xffff8009768b3a00)
[88286.703004] 38c0:
ffff000008c54000 0001000000000000
[88286.710757] 38e0:
ffff8009768b3aa0 ffff0000080d8c7c ffff8009768b3b50 ffff80097ff8a5b0
[88286.718511] 3900:
0000800977325000 0000000000000000 0000000000000040 ffff80097ffc6180
[88286.726264] 3920:
ffff8009768b3940 ffff0000088a8694 ffff80097ffc5800 0000000000000000
[88286.734017] 3940:
ffff8009768b3960 ffff0000081919c0 ffff80097ffc5280 0000000000000001
[88286.741771] 3960:
ffff8009768b3a50 ffff00000819206c ffff8009751b0e08 0000000000000000
[88286.749523] 3980:
0000000000000000 0000000000000000 0000000000000080 0000000000000000
[88286.757277] 39a0:
ffff0000080d8ae4 0000000000000000 0000000000000000 ffff800977400028
[88286.765029] 39c0:
0000000000000000 0000000000000068 0000000000000040 0000000000000004
[88286.772783] 39e0:
0000000000000000 0000ffffb345b590 ffff000008088270 0000ffffb33d9a38
[88286.780537] [<
ffff0000080d8c7c>] __queue_work+0x29c/0x3b8
[88286.785883] [<
ffff0000080d8df8>] queue_work_on+0x60/0x78
[88286.791146] [<
ffff000008764c68>] etm_setup_aux+0x178/0x238
[88286.796578] [<
ffff000008183600>] rb_alloc_aux+0x228/0x310
[88286.801925] [<
ffff00000817e564>] perf_mmap+0x404/0x5a8
[88286.807015] [<
ffff0000081c60cc>] mmap_region+0x394/0x5c0
[88286.812276] [<
ffff0000081c654c>] do_mmap+0x254/0x388
[88286.817191] [<
ffff0000081a989c>] vm_mmap_pgoff+0xbc/0xe0
[88286.822452] [<
ffff0000081c3ffc>] SyS_mmap_pgoff+0xac/0x228
[88286.827884] [<
ffff000008088288>] sys_mmap+0x18/0x28
[88286.832714] [<
ffff000008082f30>] el0_svc_naked+0x24/0x28
The patch makes sure that the event_data->work is initialised
properly before we could possibly use it.
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Tested-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suzuki K Poulose [Mon, 5 Jun 2017 20:15:03 +0000 (14:15 -0600)]
coresight: Fix reference count for software sources
For software sources (i.e STM), there could be multiple agents
generating the trace data, unlike the ETMs. So we need to
properly do the accounting for the active number of users
to disable the device when the last user goes away. Right
now, the reference counting is broken for sources as we skip
the actions when we detect that the source is enabled.
This patch fixes the problem by adding the refcounting for
software sources, even when they are enabled.
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Reported-by: Robert Walker <robert.walker@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suzuki K Poulose [Mon, 5 Jun 2017 20:15:02 +0000 (14:15 -0600)]
coresight: Disable the path only when the source is disabled
With a coresight tracing session, the components along the path
from the source to sink are disabled after the source is disabled.
However, if the source was not actually disabled due to active
users, we should not disable the components in the path.
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Colin Ian King [Thu, 18 May 2017 07:42:49 +0000 (08:42 +0100)]
thunderbolt: fix spelling mistake: "missmatch" -> "mismatch"
Trivial fix to spelling mistake in tb_sw_warn warning message
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:19 +0000 (15:25 +0300)]
MAINTAINERS: Add maintainers for Thunderbolt driver
We will be helping Andreas to maintain the Thunderbolt driver.
Signed-off-by: Michael Jamet <michael.jamet@intel.com>
Signed-off-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:18 +0000 (15:25 +0300)]
thunderbolt: Add documentation how Thunderbolt bus can be used
Since there are no such tool yet that handles all the low-level details
of connecting devices and upgrading their firmware, add a small document
that shows how the Thunderbolt bus can be used directly from command
line.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:17 +0000 (15:25 +0300)]
thunderbolt: Add support for host and device NVM firmware upgrade
Starting from Intel Falcon Ridge the NVM firmware can be upgraded by
using DMA configuration based mailbox commands. If we detect that the
host or device (device support starts from Intel Alpine Ridge) has the
DMA configuration based mailbox we expose NVM information to the
userspace as two separate Linux NVMem devices: nvm_active and
nvm_non_active. The former is read-only portion of the active NVM which
firmware upgrade tools can be use to find out suitable NVM image if the
device identification strings are not enough.
The latter is write-only portion where the new NVM image is to be
written by the userspace. It is up to the userspace to find out right
NVM image (the kernel does very minimal validation). The ICM firmware
itself authenticates the new NVM firmware and fails the operation if it
is not what is expected.
We also expose two new sysfs files per each switch: nvm_version and
nvm_authenticate which can be used to read the active NVM version and
start the upgrade process.
We also introduce safe mode which is the mode a switch goes when it does
not have properly authenticated firmware. In this mode the switch only
accepts a couple of commands including flashing a new NVM firmware image
and triggering power cycle.
This code is based on the work done by Amir Levy and Michael Jamet.
Signed-off-by: Michael Jamet <michael.jamet@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:16 +0000 (15:25 +0300)]
thunderbolt: Add support for Internal Connection Manager (ICM)
Starting from Intel Falcon Ridge the internal connection manager running
on the Thunderbolt host controller has been supporting 4 security
levels. One reason for this is to prevent DMA attacks and only allow
connecting devices the user trusts.
The internal connection manager (ICM) is the preferred way of connecting
Thunderbolt devices over software only implementation typically used on
Macs. The driver communicates with ICM using special Thunderbolt ring 0
(control channel) messages. In order to handle these messages we add
support for the ICM messages to the control channel.
The security levels are as follows:
none - No security, all tunnels are created automatically
user - User needs to approve the device before tunnels are created
secure - User need to approve the device before tunnels are created.
The device is sent a challenge on future connects to be able
to verify it is actually the approved device.
dponly - Only Display Port and USB tunnels can be created and those
are created automatically.
The security levels are typically configurable from the system BIOS and
by default it is set to "user" on many systems.
In this patch each Thunderbolt device will have either one or two new
sysfs attributes: authorized and key. The latter appears for devices
that support secure connect.
In order to identify the device the user can read identication
information, including UUID and name of the device from sysfs and based
on that make a decision to authorize the device. The device is
authorized by simply writing 1 to the "authorized" sysfs attribute. This
is following the USB bus device authorization mechanism. The secure
connect requires an additional challenge step (writing 2 to the
"authorized" attribute) in future connects when the key has already been
stored to the NVM of the device.
Non-ICM systems (before Alpine Ridge) continue to use the existing
functionality and the security level is set to none. For systems with
Alpine Ridge, even on Apple hardware, we will use ICM.
This code is based on the work done by Amir Levy and Michael Jamet.
Signed-off-by: Michael Jamet <michael.jamet@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:15 +0000 (15:25 +0300)]
thunderbolt: Do not touch the hardware if the NHI is gone on resume
On PCs the NHI host controller is only present when there is a device
connected. When the last device is disconnected the host controller will
dissappear shortly (within 10s). Now if that happens when we are
suspended we should not try to touch the hardware anymore, so add a flag
for this and check it before we re-enable rings.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:14 +0000 (15:25 +0300)]
thunderbolt: Add support for DMA configuration based mailbox
The DMA (NHI) port of a switch provides access to the NVM of the host
controller (and devices starting from Intel Alpine Ridge). The NVM
contains also more complete DROM for the root switch including vendor
and device identification strings.
This will look for the DMA port capability for each switch and if found
populates sw->dma_port. We then teach tb_drom_read() to read the DROM
information from NVM if available for the root switch.
The DMA port capability also supports upgrading the NVM for both host
controller and devices which will be added in subsequent patches.
This code is based on the work done by Amir Levy and Michael Jamet.
Signed-off-by: Michael Jamet <michael.jamet@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:13 +0000 (15:25 +0300)]
thunderbolt: Store Thunderbolt generation in the switch structure
In some cases it is useful to know what is the Thunderbolt generation
the switch supports. This introduces a new field to struct switch that
stores the generation of the switch based on the device ID. Unknown
switches (there should be none) are assumed to be first generation to be
on the safe side.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:12 +0000 (15:25 +0300)]
thunderbolt: Add support for NHI mailbox
The host controller includes two sets of registers that are used to
communicate with the firmware. Add functions that can be used to access
these registers.
This code is based on the work done by Amir Levy and Michael Jamet.
Signed-off-by: Michael Jamet <michael.jamet@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:11 +0000 (15:25 +0300)]
thunderbolt: Add new Thunderbolt PCI IDs
Add Intel Win Ridge (Thunderbolt 2) and Alpine Ridge (Thunderbolt 3)
controller PCI IDs to the list of supported devices.
This code is based on the work done by Amir Levy and Michael Jamet.
Signed-off-by: Michael Jamet <michael.jamet@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:10 +0000 (15:25 +0300)]
thunderbolt: Rework control channel to be more reliable
If a request times out the response might arrive right after the request
is failed. This response is pushed to the kfifo and next request will
read it instead. Since it most likely will not pass our validation
checks in parse_header() the next request will fail as well, and
response to that request will be pushed to the kfifo, ad infinitum.
We end up in a situation where all requests fail and no devices can be
added anymore until the driver is unloaded and reloaded again.
To overcome this, rework the control channel so that we will have a
queue of outstanding requests. Each request will be handled in turn and
the response is validated against what is expected. Unexpected packets
(for example responses for requests that have been timed out) are
dropped. This model is copied from Greybus implementation with small
changes here and there to get it cope with Thunderbolt control packets.
In addition the configuration packets support sequence number which the
switch is supposed to copy from the request to response. We use this to
drop responses that are already timed out. Taking advantage of the
sequence number, we automatically retry configuration read/write 4 times
before giving up.
Also timeout is not a programming error so there is no need to trigger a
scary backtrace (WARN), instead we just log a warning. After all
Thunderbolt devices are hot-pluggable by definition which means user can
unplug a device any time and that is totally acceptable.
With this change there is no need to take the global domain lock when
sending configuration packets anymore. This is useful when we add
support for cross-domain (XDomain) communication later on.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:09 +0000 (15:25 +0300)]
thunderbolt: Let the connection manager handle all notifications
Currently the control channel (ctl.c) handles the one supported
notification (PLUG_EVENT) and sends back ACK accordingly. However, we
are going to add support for the internal connection manager (ICM) that
needs to handle a different notifications. So instead of dealing
everything in the control channel, we change the callback to take an
arbitrary thunderbolt packet and convert the native connection manager
to handle the event itself.
In addition we only push replies we know of to the response FIFO.
Everything else is treated as notification (or request) and is expected
to be dealt by the connection manager implementation.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:08 +0000 (15:25 +0300)]
thunderbolt: Expose make_header() to other files
We will be using this function in files introduced in subsequent
patches. While there the function is renamed to tb_cfg_make_header()
following tb_cfg_get_route().
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:07 +0000 (15:25 +0300)]
thunderbolt: Expose get_route() to other files
We are going to use it when we change the connection manager to handle
events itself. Also rename it to follow naming convention used in
functions exposed in ctl.h.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:06 +0000 (15:25 +0300)]
thunderbolt: Move control channel messages to tb_msgs.h
We will be forwarding notifications received from the control channel to
the connection manager implementations. This way they can decide what to
do if anything when a notification is received.
To be able to use control channel messages from other files, move them
to tb_msgs.h.
No functional changes intended.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:05 +0000 (15:25 +0300)]
thunderbolt: Read vendor and device name from DROM
The device DROM contains name of the vendor and device among other
things. Extract this information and expose it to the userspace via two
new attributes.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Lukas Wunner [Tue, 6 Jun 2017 12:25:04 +0000 (15:25 +0300)]
thunderbolt: Refactor and fix parsing of port drom entries
Currently tb_drom_parse_entry() is only able to parse drom entries of
type TB_DROM_ENTRY_PORT. Rename it to tb_drom_parse_entry_port().
Fold tb_drom_parse_port_entry() into it.
Its return value is currently ignored. Evaluate it and abort parsing on
error.
Change tb_drom_parse_entries() to accommodate for parsing of other entry
types than TB_DROM_ENTRY_PORT.
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:03 +0000 (15:25 +0300)]
thunderbolt: Do not fail if DROM data CRC32 is invalid
There are devices out there where CRC32 of the DROM is not correct. One
reason for this is that the ICM firmware does not validate it and it
seems that neither does the Apple driver. To be able to support such
devices we continue parsing the DROM contents regardless of whether
CRC32 failed or not. We still keep the warning there.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:02 +0000 (15:25 +0300)]
thunderbolt: Fail switch adding operation if reading DROM fails
All non-root switches are expected to have DROM so if the operation
fails, it might be due the user unlugging the device. There is no point
continuing adding the switch further in that case. Just bail out.
For root switches (hosts) the DROM is either retrieved from a EFI
variable, NVM or hard-coded.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:01 +0000 (15:25 +0300)]
thunderbolt: Convert switch to a device
Thunderbolt domain consists of switches that are connected to each
other, forming a bus. This will convert each switch into a real Linux
device structure and adds them to the domain. The advantage here is
that we get all the goodies from the driver core, like reference
counting and sysfs hierarchy for free.
Also expose device identification information to the userspace via new
sysfs attributes.
In order to support internal connection manager (ICM) we separate switch
configuration into its own function (tb_switch_configure()) which is
only called by the existing native connection manager implementation
used on Macs.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:25:00 +0000 (15:25 +0300)]
thunderbolt: Introduce thunderbolt bus and connection manager
Thunderbolt fabric consists of one or more switches. This fabric is
called domain and it is controlled by an entity called connection
manager. The connection manager can be either internal (driven by a
firmware running on the host controller) or external (software driver).
This driver currently implements support for the latter.
In order to manage switches and their properties more easily we model
this domain structure as a Linux bus. Each host controller adds a domain
device to this bus, and these devices are named as domainN where N
stands for index or id of the current domain.
We then abstract connection manager specific operations into a new
structure tb_cm_ops and convert the existing tb.c to fill those
accordingly. This makes it easier to add support for the internal
connection manager in subsequent patches.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:24:59 +0000 (15:24 +0300)]
thunderbolt: Allow passing NULL to tb_ctl_free()
Following the usual pattern used in many places, we allow passing NULL
pointer to tb_ctl_free(). Then the user can call the function regardless
if it has allocated control channel or not making the code bit simpler.
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:24:58 +0000 (15:24 +0300)]
thunderbolt: Rework capability handling
Organization of the capabilities in switches and ports is not so random
after all. Rework the capability handling functionality so that it
follows how capabilities are organized and provide two new functions
(tb_switch_find_vse_cap() and tb_port_find_cap()) which can be used to
extract capabilities for ports and switches. Then convert the current
users over these.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:24:57 +0000 (15:24 +0300)]
thunderbolt: Add MSI-X support
Intel Thunderbolt controllers support up to 16 MSI-X vectors. Using
MSI-X is preferred over MSI or legacy interrupt and may bring additional
performance because there is no need to check the status registers which
interrupt was triggered.
While there we convert comments in structs tb_ring and tb_nhi to follow
kernel-doc format more closely.
This code is based on the work done by Amir Levy and Michael Jamet.
Signed-off-by: Michael Jamet <michael.jamet@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:24:56 +0000 (15:24 +0300)]
thunderbolt: Do not warn about newer DROM versions
DROM version 2 is compatible with the previous generation so no need to
warn about that.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:24:55 +0000 (15:24 +0300)]
thunderbolt: Do not try to read UID if DROM offset is read as 0
At least Falcon Ridge when in host mode does not have any kind of DROM
available and reading DROM offset returns 0 for these. Do not try to
read DROM any further in that case.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:24:54 +0000 (15:24 +0300)]
thunderbolt: No need to read UID of the root switch on resume
The root switch is part of the host controller and cannot be physically
removed, so there is no point of reading UID again on resume in order to
check if the root switch is still the same.
Suggested-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mika Westerberg [Tue, 6 Jun 2017 12:24:53 +0000 (15:24 +0300)]
thunderbolt: Use const buffer pointer in write operations
These functions should not (and do not) modify the argument in any way
so make it const.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Philipp Zabel [Sun, 14 May 2017 19:51:16 +0000 (21:51 +0200)]
mux: mmio-based syscon mux controller
This adds a driver for mmio-based syscon multiplexers controlled by
bitfields in a syscon register range.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Philipp Zabel [Sun, 14 May 2017 19:51:15 +0000 (21:51 +0200)]
dt-bindings: add mmio-based syscon mux controller DT bindings
This adds device tree binding documentation for mmio-based syscon
multiplexers controlled by a bitfields in a syscon register range.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Rosin [Sun, 14 May 2017 19:51:14 +0000 (21:51 +0200)]
mux: adg792a: add mux controller driver for ADG792A/G
Analog Devices ADG792A/G is a triple 4:1 mux.
Reviewed-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Rosin [Sun, 14 May 2017 19:51:13 +0000 (21:51 +0200)]
dt-bindings: mux-adg792a: document devicetree bindings for ADG792A/G mux
Analog Devices ADG792A/G is a triple 4:1 mux.
Acked-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Rosin [Sun, 14 May 2017 19:51:12 +0000 (21:51 +0200)]
i2c: i2c-mux-gpmux: new driver
This is a general purpose i2c mux that uses a multiplexer controlled by
the multiplexer subsystem to do the muxing.
The user can select if the mux is to be mux-locked and parent-locked
as described in Documentation/i2c/i2c-topology.
Acked-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Rosin [Sun, 14 May 2017 19:51:11 +0000 (21:51 +0200)]
dt-bindings: i2c: i2c-mux: document general purpose i2c-mux bindings
Describe how a general purpose multiplexer controller is used to mux an
i2c bus.
Acked-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Rosin [Sun, 14 May 2017 19:51:10 +0000 (21:51 +0200)]
iio: multiplexer: new iio category and iio-mux driver
When a multiplexer changes how an iio device behaves (for example
by feeding different signals to an ADC), this driver can be used
to create one virtual iio channel for each multiplexer state.
Depends on the generic multiplexer subsystem.
Cache any ext_info values from the parent iio channel, creating a private
copy of the ext_info attributes for each multiplexer state/channel.
Reviewed-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Rosin [Sun, 14 May 2017 19:51:09 +0000 (21:51 +0200)]
dt-bindings: iio: io-channel-mux: document io-channel-mux bindings
Describe how a multiplexer can be used to select which signal is fed to
an io-channel.
Acked-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Rosin [Sun, 14 May 2017 19:51:08 +0000 (21:51 +0200)]
iio: inkern: api for manipulating ext_info of iio channels
Extend the inkern api with functions for reading and writing ext_info
of iio channels.
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Rosin [Sun, 14 May 2017 19:51:07 +0000 (21:51 +0200)]
mux: gpio: add mux controller driver for gpio based multiplexers
The driver builds a single multiplexer controller using a number
of gpio pins. For N pins, there will be 2^N possible multiplexer
states. The GPIO pins can be connected (by the hardware) to several
multiplexers, which in that case will be operated in parallel.
Reviewed-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Rosin [Sun, 14 May 2017 19:51:06 +0000 (21:51 +0200)]
mux: minimal mux subsystem
Add a new minimalistic subsystem that handles multiplexer controllers.
When multiplexers are used in various places in the kernel, and the
same multiplexer controller can be used for several independent things,
there should be one place to implement support for said multiplexer
controller.
A single multiplexer controller can also be used to control several
parallel multiplexers, that are in turn used by different subsystems
in the kernel, leading to a need to coordinate multiplexer accesses.
The multiplexer subsystem handles this coordination.
Thanks go out to Lars-Peter Clausen, Jonathan Cameron, Rob Herring,
Wolfram Sang, Paul Gortmaker, Dan Carpenter, Colin Ian King, Greg
Kroah-Hartman and last but certainly not least to Philipp Zabel for
helpful comments, reviews, patches and general encouragement!
Reviewed-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Rosin [Sun, 14 May 2017 19:51:05 +0000 (21:51 +0200)]
dt-bindings: document devicetree bindings for mux-controllers and gpio-mux
Allow specifying that a single multiplexer controller can be used to
control several parallel multiplexers, thus enabling sharing of the
multiplexer controller by different consumers.
Add a binding for a first mux controller in the form of a GPIO based mux
controller.
Acked-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Rosin [Sun, 14 May 2017 19:51:04 +0000 (21:51 +0200)]
devres: trivial whitespace fix
Everything else is indented with two spaces, so fix the odd one out.
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Robert Lippert [Fri, 2 Jun 2017 21:53:22 +0000 (14:53 -0700)]
drivers/misc: add Aspeed LPC snoop driver
This driver enables the LPC snoop hardware on the ASPEED BMC
which generates an interrupt upon every write to an I/O port
by the host.
This is typically used to monitor BIOS boot progress by listening
to well-known debug port 80h.
The functionality in this commit just saves all snooped values
to a circular 2K buffer in the kernel, subsequent commits can
act on the values to do things with them.
Signed-off-by: Robert Lippert <rlippert@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Arvind Yadav [Wed, 31 May 2017 10:25:54 +0000 (15:55 +0530)]
memory: ti-aemif: Handle return value of clk_prepare_enable
clk_prepare_enable() can fail here and we must check its return value.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Kiran Gunda [Wed, 10 May 2017 14:25:41 +0000 (19:55 +0530)]
spmi: spmi-pmic-arb: enable the SPMI interrupt as a wakeup source
Currently the SPMI interrupt will not wake the device. Enable this
interrupt as a wakeup source.
Signed-off-by: Nicholas Troast <ntroast@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Abhijeet Dharmapurikar [Wed, 10 May 2017 14:25:40 +0000 (19:55 +0530)]
spmi: pmic_arb: add support for PMIC bus arbiter v3
PMIC bus arbiter v3 supports 512 SPMI peripherals. Add the v3 operators to
support this new arbiter version.
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Abhijeet Dharmapurikar [Wed, 10 May 2017 14:25:39 +0000 (19:55 +0530)]
spmi: pmic-arb: check apid enabled before calling the handler
The driver currently invokes the apid handler (periph_handler())
once it sees that the summary status bit for that apid is set.
However the hardware is designed to set that bit even if the apid
interrupts are disabled. The driver should check whether the apid
is indeed enabled before calling the apid handler.
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Abhijeet Dharmapurikar [Wed, 10 May 2017 14:25:38 +0000 (19:55 +0530)]
spmi: pmic_arb: use appropriate flow handler
The current code uses handle_level_irq flow handler even if the
trigger type of the interrupt is edge. This can lead to missing
of an edge transition that happens when the interrupt is being
handled. The level flow handler masks the interrupt while it is
being handled, so if an edge transition happens at that time,
that edge is lost.
Use an edge flow handler for edge type interrupts which ensures
that the interrupt stays enabled while being handled - at least
until it triggers at which point the flow handler sets the
IRQF_PENDING flag and only then masks the interrupt. That
IRQF_PENDING state indicates an edge transition happened while
the interrupt was being handled and the handler is called again.
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Abhijeet Dharmapurikar [Wed, 10 May 2017 14:25:37 +0000 (19:55 +0530)]
spmi: pmic-arb: clear the latched status of the interrupt
PMIC interrupts each have an internal latched status bit which is
not visible from any register. This status bit is set as soon as
the conditions specified in the interrupt type and polarity
registers are met even if the interrupt is not enabled. When it
is set, nothing else changes within the PMIC and no interrupt
notification packets are sent. If the internal latched status
bit is set when an interrupt is enabled, then the value is
immediately propagated into the interrupt latched status register
and an interrupt notification packet is sent out from the PMIC
over SPMI.
This PMIC hardware behavior can lead to a situation where the
handler for a level triggered interrupt is called immediately
after enable_irq() is called even though the interrupt physically
triggered while it was disabled within the genirq framework.
This situation takes place if the the interrupt fires twice after
calling disable_irq(). The first time it fires, the level flow
handler will mask and disregard it. Unfortunately, the second
time it fires, the internal latched status bit is set within the
PMIC and no further notification is received. When enable_irq()
is called later, the interrupt is unmasked (enabled in the PMIC)
which results in the PMIC immediately sending an interrupt
notification packet out over SPMI. This breaks the semantics
of level triggered interrupts within the genirq framework since
they should be completely ignored while disabled.
The PMIC internal latched status behavior also affects how
interrupts are treated during suspend. While entering suspend,
all interrupts not specified as wakeup mode are masked. Upon
resume, these interrupts are unmasked. Thus if any of the
non-wakeup PMIC interrupts fired while the system was suspended,
then the PMIC will send interrupt notification packets out via
SPMI as soon as they are unmasked during resume. This behavior
violates genirq semantics as well since non-wakeup interrupts
should be completely ignored during suspend.
Modify the qpnpint_irq_unmask() function so that the interrupt
latched status clear register is written immediately before the
interrupt enable register. This clears the internal latched
status bit of the interrupt so that it cannot trigger spuriously
immediately upon being enabled.
Also, while resuming an irq, an unmask could be called even if it
was not previously masked. So, before writing these registers,
check if the interrupt is already enabled within the PMIC. If it
is, then no further register writes are required. This
condition check ensures that a valid latched status register bit
is not cleared until it is properly handled.
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Abhijeet Dharmapurikar [Wed, 10 May 2017 14:25:36 +0000 (19:55 +0530)]
spmi: pmic-arb: fix missing interrupts
irq_enable is called when the device resumes. Note that the
irq_enable is called regardless of whether the interrupt was
marked enabled/disabled in the descriptor or whether it was
masked/unmasked at the controller while resuming.
The current driver unconditionally clears the interrupt in its
irq_enable callback. This is dangerous as any interrupts that
happen right before the resume could be missed.
Remove the irq_enable callback and use mask/unmask instead.
Also remove struct pmic_arb_irq_spec as it serves no real purpose.
It is used only in the translate function and the code is much
cleaner without it.
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Abhijeet Dharmapurikar [Wed, 10 May 2017 14:25:35 +0000 (19:55 +0530)]
spmi: pmic-arb: cleanup unrequested irqs
We see a unmapped irqs trigger right around bootup. This could
likely be because the bootloader exited leaving the interrupts
in an unknown or unhandled state. Ack and mask the interrupt
if one is found. A request_irq later will unmask it and also
setup proper mapping structures.
Also the current driver ensures that no read/write transaction
is in progress while it makes changes to the interrupt regions.
This is not necessary because read/writes over spmi and arbiter
interrupt control are independent operations. Hence, remove the
synchronized accesses to interrupt region.
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Abhijeet Dharmapurikar [Wed, 10 May 2017 14:25:34 +0000 (19:55 +0530)]
spmi: pmic-arb: optimize table lookups
The current driver uses a mix of radix tree and a fwd lookup
table to translate between apid and ppid. It is buggy and confusing.
Instead simply use a radix tree for v1 hardware and use the
forward lookup table for v2.
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>