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