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path: root/drivers/net/wimax/i2400m/sdio-rx.c
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Diffstat (limited to 'drivers/net/wimax/i2400m/sdio-rx.c')
-rw-r--r--drivers/net/wimax/i2400m/sdio-rx.c255
1 files changed, 255 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);
+}