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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>
30 lines
878 B
C
30 lines
878 B
C
/*
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* omap-mailbox: interprocessor communication module for OMAP
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef OMAP_MAILBOX_H
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#define OMAP_MAILBOX_H
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typedef u32 mbox_msg_t;
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typedef int __bitwise omap_mbox_irq_t;
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#define IRQ_TX ((__force omap_mbox_irq_t) 1)
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#define IRQ_RX ((__force omap_mbox_irq_t) 2)
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struct mbox_chan;
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struct mbox_client;
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struct mbox_chan *omap_mbox_request_channel(struct mbox_client *cl,
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const char *chan_name);
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void omap_mbox_save_ctx(struct mbox_chan *chan);
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void omap_mbox_restore_ctx(struct mbox_chan *chan);
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void omap_mbox_enable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq);
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void omap_mbox_disable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq);
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#endif /* OMAP_MAILBOX_H */
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