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author | Suman Anna <s-anna@ti.com> | 2014-11-04 02:05:50 +0300 |
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committer | Jassi Brar <jaswinder.singh@linaro.org> | 2014-11-27 10:21:04 +0300 |
commit | 8841a66aaa7c3b1dfeeb4192d05f2ca86df58f00 (patch) | |
tree | ed0b18adc3cba64eebcf57a194ed4689db12b43a /Documentation | |
parent | 97b0c7bd2e86c6e1e00c6b7178cf953d5f70c71a (diff) | |
download | linux-8841a66aaa7c3b1dfeeb4192d05f2ca86df58f00.tar.xz |
mailbox/omap: adapt to the new mailbox framework
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 <s-anna@ti.com>
Cc: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/devicetree/bindings/mailbox/omap-mailbox.txt | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt b/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt index 48edc4b92afb..d1a043339c11 100644 --- a/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt +++ b/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt @@ -43,6 +43,9 @@ Required properties: device. The format is dependent on which interrupt controller the OMAP device uses - ti,hwmods: Name of the hwmod associated with the mailbox +- #mbox-cells: Common mailbox binding property to identify the number + of cells required for the mailbox specifier. Should be + 1 - ti,mbox-num-users: Number of targets (processor devices) that the mailbox device can interrupt - ti,mbox-num-fifos: Number of h/w fifo queues within the mailbox IP block @@ -72,6 +75,18 @@ data that represent the following: Cell #3 (usr_id) - mailbox user id for identifying the interrupt line associated with generating a tx/rx fifo interrupt. +Mailbox Users: +============== +A device needing to communicate with a target processor device should specify +them using the common mailbox binding properties, "mboxes" and the optional +"mbox-names" (please see Documentation/devicetree/bindings/mailbox/mailbox.txt +for details). Each value of the mboxes property should contain a phandle to the +mailbox controller device node and an args specifier that will be the phandle to +the intended sub-mailbox child node to be used for communication. The equivalent +"mbox-names" property value can be used to give a name to the communication channel +to be used by the client user. + + Example: -------- @@ -81,6 +96,7 @@ mailbox: mailbox@4a0f4000 { reg = <0x4a0f4000 0x200>; interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>; ti,hwmods = "mailbox"; + #mbox-cells = <1>; ti,mbox-num-users = <3>; ti,mbox-num-fifos = <8>; mbox_ipu: mbox_ipu { @@ -93,12 +109,19 @@ mailbox: mailbox@4a0f4000 { }; }; +dsp { + ... + mboxes = <&mailbox &mbox_dsp>; + ... +}; + /* AM33xx */ mailbox: mailbox@480C8000 { compatible = "ti,omap4-mailbox"; reg = <0x480C8000 0x200>; interrupts = <77>; ti,hwmods = "mailbox"; + #mbox-cells = <1>; ti,mbox-num-users = <4>; ti,mbox-num-fifos = <8>; mbox_wkupm3: wkup_m3 { |