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 000000000000..5105a5ebc44f
--- /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);
+}