2 files changed, 408 insertions, 0 deletions

diff --git a/drivers/net/wimax/i2400m/sdio-rx.c b/drivers/net/wimax/i2400m/sdio-rx.c
new file mode 100644
index 000000000000..a3008b904f7d
--- /dev/null
+++ b/drivers/net/wimax/i2400m/sdio-rx.c
@@ -0,0 +1,255 @@
+/*
+ * Intel Wireless WiMAX Connection 2400m
+ * SDIO RX 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>
+ * Dirk Brandewie <dirk.j.brandewie@intel.com>
+ *  - Initial implementation
+ *
+ *
+ * This handles the RX path on SDIO.
+ *
+ * The SDIO bus driver calls the "irq" routine when data is available.
+ * This is not a traditional interrupt routine since the SDIO bus
+ * driver calls us from its irq thread context.  Because of this
+ * sleeping in the SDIO RX IRQ routine is okay.
+ *
+ * From there on, we obtain the size of the data that is available,
+ * allocate an skb, copy it and then pass it to the generic driver's
+ * RX routine [i2400m_rx()].
+ *
+ * ROADMAP
+ *
+ * i2400ms_irq()
+ *   i2400ms_rx()
+ *     __i2400ms_rx_get_size()
+ *     i2400m_rx()
+ *
+ * i2400ms_rx_setup()
+ *
+ * i2400ms_rx_release()
+ */
+#include <linux/workqueue.h>
+#include <linux/wait.h>
+#include <linux/skbuff.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/sdio_func.h>
+#include "i2400m-sdio.h"
+
+#define D_SUBMODULE rx
+#include "sdio-debug-levels.h"
+
+
+/*
+ * Read and return the amount of bytes available for RX
+ *
+ * The RX size has to be read like this: byte reads of three
+ * sequential locations; then glue'em together.
+ *
+ * sdio_readl() doesn't work.
+ */
+ssize_t __i2400ms_rx_get_size(struct i2400ms *i2400ms)
+{
+        int ret, cnt, val;
+        ssize_t rx_size;
+        unsigned xfer_size_addr;
+        struct sdio_func *func = i2400ms->func;
+        struct device *dev = &i2400ms->func->dev;
+
+        d_fnstart(7, dev, "(i2400ms %p)\n", i2400ms);
+        xfer_size_addr = I2400MS_INTR_GET_SIZE_ADDR;
+        rx_size = 0;
+        for (cnt = 0; cnt < 3; cnt++) {
+                val = sdio_readb(func, xfer_size_addr + cnt, &ret);
+                if (ret < 0) {
+                        dev_err(dev, "RX: Can't read byte %d of RX size from "
+                                "0x%08x: %d\n", cnt, xfer_size_addr + cnt, ret);
+                        rx_size = ret;
+                        goto error_read;
+                }
+                rx_size = rx_size << 8 | (val & 0xff);
+        }
+        d_printf(6, dev, "RX: rx_size is %ld\n", (long) rx_size);
+error_read:
+        d_fnend(7, dev, "(i2400ms %p) = %ld\n", i2400ms, (long) rx_size);
+        return rx_size;
+}
+
+
+/*
+ * Read data from the device (when in normal)
+ *
+ * Allocate an SKB of the right size, read the data in and then
+ * deliver it to the generic layer.
+ *
+ * We also check for a reboot barker. That means the device died and
+ * we have to reboot it.
+ */
+static
+void i2400ms_rx(struct i2400ms *i2400ms)
+{
+        int ret;
+        struct sdio_func *func = i2400ms->func;
+        struct device *dev = &func->dev;
+        struct i2400m *i2400m = &i2400ms->i2400m;
+        struct sk_buff *skb;
+        ssize_t rx_size;
+
+        d_fnstart(7, dev, "(i2400ms %p)\n", i2400ms);
+        rx_size = __i2400ms_rx_get_size(i2400ms);
+        if (rx_size < 0) {
+                ret = rx_size;
+                goto error_get_size;
+        }
+        ret = -ENOMEM;
+        skb = alloc_skb(rx_size, GFP_ATOMIC);
+        if (NULL == skb) {
+                dev_err(dev, "RX: unable to alloc skb\n");
+                goto error_alloc_skb;
+        }
+
+        ret = sdio_memcpy_fromio(func, skb->data,
+                                 I2400MS_DATA_ADDR, rx_size);
+        if (ret < 0) {
+                dev_err(dev, "RX: SDIO data read failed: %d\n", ret);
+                goto error_memcpy_fromio;
+        }
+        /* Check if device has reset */
+        if (!memcmp(skb->data, i2400m_NBOOT_BARKER,
+                    sizeof(i2400m_NBOOT_BARKER))
+            || !memcmp(skb->data, i2400m_SBOOT_BARKER,
+                       sizeof(i2400m_SBOOT_BARKER))) {
+                ret = i2400m_dev_reset_handle(i2400m);
+                kfree_skb(skb);
+        } else {
+                skb_put(skb, rx_size);
+                i2400m_rx(i2400m, skb);
+        }
+        d_fnend(7, dev, "(i2400ms %p) = void\n", i2400ms);
+        return;
+
+error_memcpy_fromio:
+        kfree_skb(skb);
+error_alloc_skb:
+error_get_size:
+        d_fnend(7, dev, "(i2400ms %p) = %d\n", i2400ms, ret);
+        return;
+}
+
+
+/*
+ * Process an interrupt from the SDIO card
+ *
+ * FIXME: need to process other events that are not just ready-to-read
+ *
+ * Checks there is data ready and then proceeds to read it.
+ */
+static
+void i2400ms_irq(struct sdio_func *func)
+{
+        int ret;
+        struct i2400ms *i2400ms = sdio_get_drvdata(func);
+        struct i2400m *i2400m = &i2400ms->i2400m;
+        struct device *dev = &func->dev;
+        int val;
+
+        d_fnstart(6, dev, "(i2400ms %p)\n", i2400ms);
+        val = sdio_readb(func, I2400MS_INTR_STATUS_ADDR, &ret);
+        if (ret < 0) {
+                dev_err(dev, "RX: Can't read interrupt status: %d\n", ret);
+                goto error_no_irq;
+        }
+        if (!val) {
+                dev_err(dev, "RX: BUG? got IRQ but no interrupt ready?\n");
+                goto error_no_irq;
+        }
+        sdio_writeb(func, 1, I2400MS_INTR_CLEAR_ADDR, &ret);
+        if (WARN_ON(i2400m->boot_mode != 0))
+                dev_err(dev, "RX: SW BUG? boot mode and IRQ is up?\n");
+        else
+                i2400ms_rx(i2400ms);
+error_no_irq:
+        d_fnend(6, dev, "(i2400ms %p) = void\n", i2400ms);
+        return;
+}
+
+
+/*
+ * Setup SDIO RX
+ *
+ * Hooks up the IRQ handler and then enables IRQs.
+ */
+int i2400ms_rx_setup(struct i2400ms *i2400ms)
+{
+        int result;
+        struct sdio_func *func = i2400ms->func;
+        struct device *dev = &func->dev;
+
+        d_fnstart(5, dev, "(i2400ms %p)\n", i2400ms);
+        sdio_claim_host(func);
+        result = sdio_claim_irq(func, i2400ms_irq);
+        if (result < 0) {
+                dev_err(dev, "Cannot claim IRQ: %d\n", result);
+                goto error_irq_claim;
+        }
+        result = 0;
+        sdio_writeb(func, 1, I2400MS_INTR_ENABLE_ADDR, &result);
+        if (result < 0) {
+                sdio_release_irq(func);
+                dev_err(dev, "Failed to enable interrupts %d\n", result);
+        }
+error_irq_claim:
+        sdio_release_host(func);
+        d_fnend(5, dev, "(i2400ms %p) = %d\n", i2400ms, result);
+        return result;
+}
+
+
+/*
+ * Tear down SDIO RX
+ *
+ * Disables IRQs in the device and removes the IRQ handler.
+ */
+void i2400ms_rx_release(struct i2400ms *i2400ms)
+{
+        int result;
+        struct sdio_func *func = i2400ms->func;
+        struct device *dev = &func->dev;
+
+        d_fnstart(5, dev, "(i2400ms %p)\n", i2400ms);
+        sdio_claim_host(func);
+        sdio_writeb(func, 0, I2400MS_INTR_ENABLE_ADDR, &result);
+        sdio_release_irq(func);
+        sdio_release_host(func);
+        d_fnend(5, dev, "(i2400ms %p) = %d\n", i2400ms, result);
+}
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);
+}