linux/drivers/mailbox, branch v4.1

mailbox: arm_mhu: add driver for ARM MHU controller

2015-03-17T05:42:01Z

Add driver for the ARM Primecell Message-Handling-Unit(MHU) controller. Signed-off-by: Jassi Brar Signed-off-by: Andy Green Signed-off-by: Vincent Yang Signed-off-by: Tetsuya Nuriya

Mailbox: Restructure and simplify PCC mailbox code

2015-03-04T15:34:22Z

Previously the PCC driver depended on the client side to map the communication space base address. This region was was then used in the PCC driver and the client side. The client side used this region to read and write its data and the PCC driver used it to only write the PCC command. Removing this split simplifies the PCC driver a lot. This patch moves all communication region read/writes to the client side. The PCC clients can now drive the PCC mailbox controller via the mbox_client_txdone() method. Signed-off-by: Ashwin Chaugule

Merge branch 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration

2015-02-11T20:56:40Z

Pull mailbox framework updates from Jassi Brar. * 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration: mailbox: Add Altera mailbox driver mailbox: check for bit set before polling Mailbox: Fix return value check in pcc_init()

mailbox: Add Altera mailbox driver

2015-02-06T05:28:27Z

The Altera mailbox allows for interprocessor communication. It supports only one channel and work as either sender or receiver. Signed-off-by: Ley Foon Tan

mailbox: check for bit set before polling

2015-02-06T05:28:05Z

Before polling we just need to see if the TXDONE_BY_POLL bit is set in txdone_method. There may be another bit (method) specified as well, like TXDONE_BY_ACK. Signed-off-by: Jassi Brar

Mailbox: Fix return value check in pcc_init()

2015-02-06T05:27:56Z

In case of error, the function platform_create_bundle() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). Signed-off-by: Wei Yongjun

ACPI / PCC: Use pr_debug() for debug messages in pcc_init()

2015-02-04T23:40:08Z

pcc_init() uses pr_err() to print two messages that are really debug and not interesting to users. Replace those pr_err() with pr_debug(). Reported-by: Cristian Signed-off-by: Rafael J. Wysocki

Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

2014-12-15T00:10:09Z

Pull driver core update from Greg KH: "Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while" * tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits) Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries" fs: debugfs: add forward declaration for struct device type firmware class: Deletion of an unnecessary check before the function call "vunmap" firmware loader: fix hung task warning dump devcoredump: provide a one-way disable function device: Add dev__once variants ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries ath: use seq_file api for ath9k debugfs files debugfs: add helper function to create device related seq_file drivers/base: cacheinfo: remove noisy error boot message Revert "core: platform: add warning if driver has no owner" drivers: base: support cpu cache information interface to userspace via sysfs drivers: base: add cpu_device_create to support per-cpu devices topology: replace custom attribute macros with standard DEVICE_ATTR* cpumask: factor out show_cpumap into separate helper function driver core: Fix unbalanced device reference in drivers_probe driver core: fix race with userland in device_add() sysfs/kernfs: make read requests on pre-alloc files use the buffer. sysfs/kernfs: allow attributes to request write buffer be pre-allocated. fs: sysfs: return EGBIG on write if offset is larger than file size ...

Mailbox: Add support for Platform Communication Channel

2014-11-27T07:21:09Z

ACPI 5.0+ spec defines a generic mode of communication between the OS and a platform such as the BMC. This medium (PCC) is typically used by CPPC (ACPI CPU Performance management), RAS (ACPI reliability protocol) and MPST (ACPI Memory power states). This patch adds PCC support as a Mailbox Controller. As of ACPI v5.1 there is no provision for clients to lookup mailbox controllers in a way that Linux expects. e.g. in DT the clients can list the mailboxes they can associate with in the DT binding and then provide a unique index to lookup a channel within a mailbox. Since the ACPI spec doesn't have anything similar, we introduce a mailbox controller specific API so that when the client calls it, we know to lookup in the context of a specific controller. This also helps in keeping a consistent interface across DT and ACPI for such drivers. This patch implements basic PCC support using the ACPI v5.1 structures. IRQ mode support will be provided as follow up patches. Signed-off-by: Ashwin Chaugule Reviewed-by: Mark Brown Reviewed-by: Arnd Bergmann Signed-off-by: Jassi Brar

mailbox/omap: adapt to the new mailbox framework

2014-11-27T07:21:04Z

The OMAP mailbox driver and its existing clients (remoteproc for OMAP4+) are adapted to use the generic mailbox framework. The main changes for the adaptation are: - The tasklet used for Tx is replaced with the state machine from the generic mailbox framework. The workqueue used for processing the received messages stays intact for minimizing the effects on the OMAP mailbox clients. - The existing exported client API, omap_mbox_get, omap_mbox_put and omap_mbox_send_msg are deleted, as the framework provides equivalent functionality. A OMAP-specific omap_mbox_request_channel is added though to support non-DT way of requesting mailboxes. - The OMAP mailbox driver is integrated with the mailbox framework through the proper implementations of mbox_chan_ops, except for .last_tx_done and .peek_data. The OMAP mailbox driver does not need these ops, as it is completely interrupt driven. - The OMAP mailbox driver uses a custom of_xlate controller ops that allows phandles for the pargs specifier instead of indexing to avoid any channel registration order dependencies. - The new framework does not support multiple clients operating on a single channel, so the reference counting logic is simplified. - The remoteproc driver (current client) is adapted to use the new API. The notifier callbacks used within this client is replaced with the regular callbacks from the newer framework. - The exported OMAP mailbox API are limited to omap_mbox_save_ctx, omap_mbox_restore_ctx, omap_mbox_enable_irq & omap_mbox_disable_irq, with the signature modified to take in the new mbox_chan handle instead of the OMAP specific omap_mbox handle. The first 2 will be removed when the OMAP mailbox driver is adapted to runtime_pm. The other exported API omap_mbox_request_channel will be removed once existing legacy users are converted to DT. Signed-off-by: Suman Anna Cc: Ohad Ben-Cohen Signed-off-by: Jassi Brar