diff options
Diffstat (limited to 'drivers/net/wimax/i2400m/sdio-tx.c')
| -rw-r--r-- | drivers/net/wimax/i2400m/sdio-tx.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/drivers/net/wimax/i2400m/sdio-tx.c b/drivers/net/wimax/i2400m/sdio-tx.c new file mode 100644 index 00000000000..5105a5ebc44 --- /dev/null +++ b/drivers/net/wimax/i2400m/sdio-tx.c @@ -0,0 +1,153 @@ +/* + * 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; + + 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. + */ + queue_work(i2400ms->tx_workqueue, &i2400ms->tx_worker); + + 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; + + 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); + i2400ms->tx_workqueue = + create_singlethread_workqueue(i2400ms->tx_wq_name); + if (NULL == i2400ms->tx_workqueue) { + dev_err(dev, "TX: failed to create workqueue\n"); + result = -ENOMEM; + } else + result = 0; + d_fnend(5, dev, "(i2400ms %p) = %d\n", i2400ms, result); + return result; +} + +void i2400ms_tx_release(struct i2400ms *i2400ms) +{ + destroy_workqueue(i2400ms->tx_workqueue); +} |