• Suman Anna's avatar
    mailbox/omap: adapt to the new mailbox framework · 8841a66a
    Suman Anna authored
    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: default avatarSuman Anna <s-anna@ti.com>
    Cc: Ohad Ben-Cohen <ohad@wizery.com>
    Signed-off-by: default avatarJassi Brar <jaswinder.singh@linaro.org>
    8841a66a
omap-mailbox.txt 5.15 KB