230 lines
7.3 KiB
C
230 lines
7.3 KiB
C
|
/*
|
||
|
|
* Intel Wireless WiMAX Connection 2400m
|
||
|
|
* USB specific TX handling
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* 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>
|
||
|
|
* Yanir Lubetkin <yanirx.lubetkin@intel.com>
|
||
|
|
* - Initial implementation
|
||
|
|
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
|
||
|
|
* - Split transport/device specific
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* 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. We could also retry, but the USB stack has
|
||
|
|
* already retried and still failed, so there is not much of a
|
||
|
|
* point. As well, most of the traffic is network, which has recovery
|
||
|
|
* methods for dropped packets.
|
||
|
|
*
|
||
|
|
* For sending we just obtain a FIFO buffer to send, send it to the
|
||
|
|
* USB bulk out, tell the TX FIFO code we have sent it; query for
|
||
|
|
* another one, etc... until done.
|
||
|
|
*
|
||
|
|
* We use a thread so we can call usb_autopm_enable() and
|
||
|
|
* usb_autopm_disable() for each transaction; this way when the device
|
||
|
|
* goes idle, it will suspend. It also has less overhead than a
|
||
|
|
* dedicated workqueue, as it is being used for a single task.
|
||
|
|
*
|
||
|
|
* ROADMAP
|
||
|
|
*
|
||
|
|
* i2400mu_tx_setup()
|
||
|
|
* i2400mu_tx_release()
|
||
|
|
*
|
||
|
|
* i2400mu_bus_tx_kick() - Called by the tx.c code when there
|
||
|
|
* is new data in the FIFO.
|
||
|
|
* i2400mu_txd()
|
||
|
|
* i2400m_tx_msg_get()
|
||
|
|
* i2400m_tx_msg_sent()
|
||
|
|
*/
|
||
|
|
#include "i2400m-usb.h"
|
||
|
|
|
||
|
|
|
||
|
|
#define D_SUBMODULE tx
|
||
|
|
#include "usb-debug-levels.h"
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Get the next TX message in the TX FIFO and send it to the device
|
||
|
|
*
|
||
|
|
* Note that any iteration consumes a message to be sent, no matter if
|
||
|
|
* it succeeds or fails (we have no real way to retry or complain).
|
||
|
|
*
|
||
|
|
* Return: 0 if ok, < 0 errno code on hard error.
|
||
|
|
*/
|
||
|
|
static
|
||
|
|
int i2400mu_tx(struct i2400mu *i2400mu, struct i2400m_msg_hdr *tx_msg,
|
||
|
|
size_t tx_msg_size)
|
||
|
|
{
|
||
|
|
int result = 0;
|
||
|
|
struct i2400m *i2400m = &i2400mu->i2400m;
|
||
|
|
struct device *dev = &i2400mu->usb_iface->dev;
|
||
|
|
int usb_pipe, sent_size, do_autopm;
|
||
|
|
struct usb_endpoint_descriptor *epd;
|
||
|
|
|
||
|
|
d_fnstart(4, dev, "(i2400mu %p)\n", i2400mu);
|
||
|
|
do_autopm = atomic_read(&i2400mu->do_autopm);
|
||
|
|
result = do_autopm ?
|
||
|
|
usb_autopm_get_interface(i2400mu->usb_iface) : 0;
|
||
|
|
if (result < 0) {
|
||
|
|
dev_err(dev, "TX: can't get autopm: %d\n", result);
|
||
|
|
do_autopm = 0;
|
||
|
|
}
|
||
|
|
epd = usb_get_epd(i2400mu->usb_iface, I2400MU_EP_BULK_OUT);
|
||
|
|
usb_pipe = usb_sndbulkpipe(i2400mu->usb_dev, epd->bEndpointAddress);
|
||
|
|
retry:
|
||
|
|
result = usb_bulk_msg(i2400mu->usb_dev, usb_pipe,
|
||
|
|
tx_msg, tx_msg_size, &sent_size, HZ);
|
||
|
|
usb_mark_last_busy(i2400mu->usb_dev);
|
||
|
|
switch (result) {
|
||
|
|
case 0:
|
||
|
|
if (sent_size != tx_msg_size) { /* Too short? drop it */
|
||
|
|
dev_err(dev, "TX: short write (%d B vs %zu "
|
||
|
|
"expected)\n", sent_size, tx_msg_size);
|
||
|
|
result = -EIO;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case -EINVAL: /* while removing driver */
|
||
|
|
case -ENODEV: /* dev disconnect ... */
|
||
|
|
case -ENOENT: /* just ignore it */
|
||
|
|
case -ESHUTDOWN: /* and exit */
|
||
|
|
case -ECONNRESET:
|
||
|
|
result = -ESHUTDOWN;
|
||
|
|
break;
|
||
|
|
default: /* Some error? */
|
||
|
|
if (edc_inc(&i2400mu->urb_edc,
|
||
|
|
EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
|
||
|
|
dev_err(dev, "TX: maximum errors in URB "
|
||
|
|
"exceeded; resetting device\n");
|
||
|
|
usb_queue_reset_device(i2400mu->usb_iface);
|
||
|
|
} else {
|
||
|
|
dev_err(dev, "TX: cannot send URB; retrying. "
|
||
|
|
"tx_msg @%zu %zu B [%d sent]: %d\n",
|
||
|
|
(void *) tx_msg - i2400m->tx_buf,
|
||
|
|
tx_msg_size, sent_size, result);
|
||
|
|
goto retry;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (do_autopm)
|
||
|
|
usb_autopm_put_interface(i2400mu->usb_iface);
|
||
|
|
d_fnend(4, dev, "(i2400mu %p) = result\n", i2400mu);
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Get the next TX message in the TX FIFO and send it to the device
|
||
|
|
*
|
||
|
|
* Note we exit the loop if i2400mu_tx() fails; that funtion only
|
||
|
|
* fails on hard error (failing to tx a buffer not being one of them,
|
||
|
|
* see its doc).
|
||
|
|
*
|
||
|
|
* Return: 0
|
||
|
|
*/
|
||
|
|
static
|
||
|
|
int i2400mu_txd(void *_i2400mu)
|
||
|
|
{
|
||
|
|
int result = 0;
|
||
|
|
struct i2400mu *i2400mu = _i2400mu;
|
||
|
|
struct i2400m *i2400m = &i2400mu->i2400m;
|
||
|
|
struct device *dev = &i2400mu->usb_iface->dev;
|
||
|
|
struct i2400m_msg_hdr *tx_msg;
|
||
|
|
size_t tx_msg_size;
|
||
|
|
|
||
|
|
d_fnstart(4, dev, "(i2400mu %p)\n", i2400mu);
|
||
|
|
|
||
|
|
while (1) {
|
||
|
|
d_printf(2, dev, "TX: waiting for messages\n");
|
||
|
|
tx_msg = NULL;
|
||
|
|
wait_event_interruptible(
|
||
|
|
i2400mu->tx_wq,
|
||
|
|
(kthread_should_stop() /* check this first! */
|
||
|
|
|| (tx_msg = i2400m_tx_msg_get(i2400m, &tx_msg_size)))
|
||
|
|
);
|
||
|
|
if (kthread_should_stop())
|
||
|
|
break;
|
||
|
|
WARN_ON(tx_msg == NULL); /* should not happen...*/
|
||
|
|
d_printf(2, dev, "TX: submitting %zu bytes\n", tx_msg_size);
|
||
|
|
d_dump(5, dev, tx_msg, tx_msg_size);
|
||
|
|
/* Yeah, we ignore errors ... not much we can do */
|
||
|
|
i2400mu_tx(i2400mu, tx_msg, tx_msg_size);
|
||
|
|
i2400m_tx_msg_sent(i2400m); /* ack it, advance the FIFO */
|
||
|
|
if (result < 0)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
d_fnend(4, dev, "(i2400mu %p) = %d\n", i2400mu, result);
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* i2400m TX engine notifies us that there is data in the FIFO ready
|
||
|
|
* for TX
|
||
|
|
*
|
||
|
|
* If there is a URB in flight, don't do anything; when it finishes,
|
||
|
|
* it will see there is data in the FIFO and send it. Else, just
|
||
|
|
* submit a write.
|
||
|
|
*/
|
||
|
|
void i2400mu_bus_tx_kick(struct i2400m *i2400m)
|
||
|
|
{
|
||
|
|
struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
|
||
|
|
struct device *dev = &i2400mu->usb_iface->dev;
|
||
|
|
|
||
|
|
d_fnstart(3, dev, "(i2400m %p) = void\n", i2400m);
|
||
|
|
wake_up_all(&i2400mu->tx_wq);
|
||
|
|
d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
int i2400mu_tx_setup(struct i2400mu *i2400mu)
|
||
|
|
{
|
||
|
|
int result = 0;
|
||
|
|
struct i2400m *i2400m = &i2400mu->i2400m;
|
||
|
|
struct device *dev = &i2400mu->usb_iface->dev;
|
||
|
|
struct wimax_dev *wimax_dev = &i2400m->wimax_dev;
|
||
|
|
|
||
|
|
i2400mu->tx_kthread = kthread_run(i2400mu_txd, i2400mu, "%s-tx",
|
||
|
|
wimax_dev->name);
|
||
|
|
if (IS_ERR(i2400mu->tx_kthread)) {
|
||
|
|
result = PTR_ERR(i2400mu->tx_kthread);
|
||
|
|
dev_err(dev, "TX: cannot start thread: %d\n", result);
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
void i2400mu_tx_release(struct i2400mu *i2400mu)
|
||
|
|
{
|
||
|
|
kthread_stop(i2400mu->tx_kthread);
|
||
|
|
}
|