154 строки
4.8 KiB
C
154 строки
4.8 KiB
C
/*
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* Intel Wireless WiMAX Connection 2400m
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* SDIO TX transaction backends
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*
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*
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* Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* Intel Corporation <linux-wimax@intel.com>
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* Dirk Brandewie <dirk.j.brandewie@intel.com>
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* - Initial implementation
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*
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*
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* Takes the TX messages in the i2400m's driver TX FIFO and sends them
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* to the device until there are no more.
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*
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* If we fail sending the message, we just drop it. There isn't much
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* we can do at this point. Most of the traffic is network, which has
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* recovery methods for dropped packets.
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*
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* The SDIO functions are not atomic, so we can't run from the context
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* where i2400m->bus_tx_kick() [i2400ms_bus_tx_kick()] is being called
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* (some times atomic). Thus, the actual TX work is deferred to a
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* workqueue.
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*
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* ROADMAP
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*
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* i2400ms_bus_tx_kick()
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* i2400ms_tx_submit() [through workqueue]
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*
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* i2400m_tx_setup()
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*
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* i2400m_tx_release()
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*/
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#include <linux/mmc/sdio_func.h>
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#include "i2400m-sdio.h"
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#define D_SUBMODULE tx
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#include "sdio-debug-levels.h"
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/*
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* Pull TX transations from the TX FIFO and send them to the device
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* until there are no more.
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*/
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static
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void i2400ms_tx_submit(struct work_struct *ws)
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{
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int result;
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struct i2400ms *i2400ms = container_of(ws, struct i2400ms, tx_worker);
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struct i2400m *i2400m = &i2400ms->i2400m;
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struct sdio_func *func = i2400ms->func;
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struct device *dev = &func->dev;
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struct i2400m_msg_hdr *tx_msg;
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size_t tx_msg_size;
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d_fnstart(4, dev, "(i2400ms %p, i2400m %p)\n", i2400ms, i2400ms);
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while (NULL != (tx_msg = i2400m_tx_msg_get(i2400m, &tx_msg_size))) {
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d_printf(2, dev, "TX: submitting %zu bytes\n", tx_msg_size);
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d_dump(5, dev, tx_msg, tx_msg_size);
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sdio_claim_host(func);
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result = sdio_memcpy_toio(func, 0, tx_msg, tx_msg_size);
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sdio_release_host(func);
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i2400m_tx_msg_sent(i2400m);
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if (result < 0) {
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dev_err(dev, "TX: cannot submit TX; tx_msg @%zu %zu B:"
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" %d\n", (void *) tx_msg - i2400m->tx_buf,
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tx_msg_size, result);
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}
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d_printf(2, dev, "TX: %zub submitted\n", tx_msg_size);
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}
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d_fnend(4, dev, "(i2400ms %p) = void\n", i2400ms);
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}
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/*
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* The generic driver notifies us that there is data ready for TX
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*
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* Schedule a run of i2400ms_tx_submit() to handle it.
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*/
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void i2400ms_bus_tx_kick(struct i2400m *i2400m)
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{
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struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
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struct device *dev = &i2400ms->func->dev;
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d_fnstart(3, dev, "(i2400m %p) = void\n", i2400m);
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/* schedule tx work, this is because tx may block, therefore
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* it has to run in a thread context.
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*/
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queue_work(i2400ms->tx_workqueue, &i2400ms->tx_worker);
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d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
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}
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int i2400ms_tx_setup(struct i2400ms *i2400ms)
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{
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int result;
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struct device *dev = &i2400ms->func->dev;
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struct i2400m *i2400m = &i2400ms->i2400m;
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d_fnstart(5, dev, "(i2400ms %p)\n", i2400ms);
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INIT_WORK(&i2400ms->tx_worker, i2400ms_tx_submit);
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snprintf(i2400ms->tx_wq_name, sizeof(i2400ms->tx_wq_name),
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"%s-tx", i2400m->wimax_dev.name);
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i2400ms->tx_workqueue =
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create_singlethread_workqueue(i2400ms->tx_wq_name);
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if (NULL == i2400ms->tx_workqueue) {
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dev_err(dev, "TX: failed to create workqueue\n");
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result = -ENOMEM;
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} else
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result = 0;
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d_fnend(5, dev, "(i2400ms %p) = %d\n", i2400ms, result);
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return result;
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}
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void i2400ms_tx_release(struct i2400ms *i2400ms)
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{
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destroy_workqueue(i2400ms->tx_workqueue);
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}
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