302 lines
8.5 KiB
C
302 lines
8.5 KiB
C
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/*
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* Intel Wireless WiMAX Connection 2400m
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* SDIO RX handling
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*
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*
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* Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* Intel Corporation <linux-wimax@intel.com>
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* Dirk Brandewie <dirk.j.brandewie@intel.com>
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* - Initial implementation
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*
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*
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* This handles the RX path on SDIO.
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*
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* The SDIO bus driver calls the "irq" routine when data is available.
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* This is not a traditional interrupt routine since the SDIO bus
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* driver calls us from its irq thread context. Because of this
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* sleeping in the SDIO RX IRQ routine is okay.
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*
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* From there on, we obtain the size of the data that is available,
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* allocate an skb, copy it and then pass it to the generic driver's
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* RX routine [i2400m_rx()].
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*
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* ROADMAP
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*
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* i2400ms_irq()
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* i2400ms_rx()
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* __i2400ms_rx_get_size()
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* i2400m_is_boot_barker()
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* i2400m_rx()
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*
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* i2400ms_rx_setup()
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*
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* i2400ms_rx_release()
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*/
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#include <linux/workqueue.h>
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#include <linux/wait.h>
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#include <linux/skbuff.h>
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#include <linux/mmc/sdio.h>
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#include <linux/mmc/sdio_func.h>
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#include <linux/slab.h>
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#include "i2400m-sdio.h"
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#define D_SUBMODULE rx
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#include "sdio-debug-levels.h"
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static const __le32 i2400m_ACK_BARKER[4] = {
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__constant_cpu_to_le32(I2400M_ACK_BARKER),
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__constant_cpu_to_le32(I2400M_ACK_BARKER),
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__constant_cpu_to_le32(I2400M_ACK_BARKER),
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__constant_cpu_to_le32(I2400M_ACK_BARKER)
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};
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/*
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* Read and return the amount of bytes available for RX
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*
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* The RX size has to be read like this: byte reads of three
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* sequential locations; then glue'em together.
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*
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* sdio_readl() doesn't work.
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*/
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static ssize_t __i2400ms_rx_get_size(struct i2400ms *i2400ms)
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{
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int ret, cnt, val;
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ssize_t rx_size;
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unsigned xfer_size_addr;
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struct sdio_func *func = i2400ms->func;
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struct device *dev = &i2400ms->func->dev;
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d_fnstart(7, dev, "(i2400ms %p)\n", i2400ms);
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xfer_size_addr = I2400MS_INTR_GET_SIZE_ADDR;
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rx_size = 0;
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for (cnt = 0; cnt < 3; cnt++) {
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val = sdio_readb(func, xfer_size_addr + cnt, &ret);
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if (ret < 0) {
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dev_err(dev, "RX: Can't read byte %d of RX size from "
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"0x%08x: %d\n", cnt, xfer_size_addr + cnt, ret);
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rx_size = ret;
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goto error_read;
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}
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rx_size = rx_size << 8 | (val & 0xff);
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}
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d_printf(6, dev, "RX: rx_size is %ld\n", (long) rx_size);
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error_read:
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d_fnend(7, dev, "(i2400ms %p) = %ld\n", i2400ms, (long) rx_size);
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return rx_size;
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}
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/*
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* Read data from the device (when in normal)
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*
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* Allocate an SKB of the right size, read the data in and then
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* deliver it to the generic layer.
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*
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* We also check for a reboot barker. That means the device died and
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* we have to reboot it.
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*/
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static
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void i2400ms_rx(struct i2400ms *i2400ms)
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{
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int ret;
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struct sdio_func *func = i2400ms->func;
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struct device *dev = &func->dev;
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struct i2400m *i2400m = &i2400ms->i2400m;
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struct sk_buff *skb;
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ssize_t rx_size;
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d_fnstart(7, dev, "(i2400ms %p)\n", i2400ms);
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rx_size = __i2400ms_rx_get_size(i2400ms);
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if (rx_size < 0) {
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ret = rx_size;
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goto error_get_size;
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}
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/*
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* Hardware quirk: make sure to clear the INTR status register
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* AFTER getting the data transfer size.
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*/
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sdio_writeb(func, 1, I2400MS_INTR_CLEAR_ADDR, &ret);
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ret = -ENOMEM;
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skb = alloc_skb(rx_size, GFP_ATOMIC);
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if (NULL == skb) {
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dev_err(dev, "RX: unable to alloc skb\n");
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goto error_alloc_skb;
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}
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ret = sdio_memcpy_fromio(func, skb->data,
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I2400MS_DATA_ADDR, rx_size);
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if (ret < 0) {
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dev_err(dev, "RX: SDIO data read failed: %d\n", ret);
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goto error_memcpy_fromio;
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}
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rmb(); /* make sure we get boot_mode from dev_reset_handle */
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if (unlikely(i2400m->boot_mode == 1)) {
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spin_lock(&i2400m->rx_lock);
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i2400ms->bm_ack_size = rx_size;
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spin_unlock(&i2400m->rx_lock);
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memcpy(i2400m->bm_ack_buf, skb->data, rx_size);
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wake_up(&i2400ms->bm_wfa_wq);
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d_printf(5, dev, "RX: SDIO boot mode message\n");
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kfree_skb(skb);
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goto out;
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}
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ret = -EIO;
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if (unlikely(rx_size < sizeof(__le32))) {
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dev_err(dev, "HW BUG? only %zu bytes received\n", rx_size);
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goto error_bad_size;
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}
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if (likely(i2400m_is_d2h_barker(skb->data))) {
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skb_put(skb, rx_size);
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i2400m_rx(i2400m, skb);
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} else if (unlikely(i2400m_is_boot_barker(i2400m,
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skb->data, rx_size))) {
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ret = i2400m_dev_reset_handle(i2400m, "device rebooted");
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dev_err(dev, "RX: SDIO reboot barker\n");
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kfree_skb(skb);
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} else {
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i2400m_unknown_barker(i2400m, skb->data, rx_size);
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kfree_skb(skb);
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}
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out:
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d_fnend(7, dev, "(i2400ms %p) = void\n", i2400ms);
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return;
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error_memcpy_fromio:
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kfree_skb(skb);
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error_alloc_skb:
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error_get_size:
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error_bad_size:
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d_fnend(7, dev, "(i2400ms %p) = %d\n", i2400ms, ret);
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}
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/*
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* Process an interrupt from the SDIO card
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*
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* FIXME: need to process other events that are not just ready-to-read
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*
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* Checks there is data ready and then proceeds to read it.
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*/
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static
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void i2400ms_irq(struct sdio_func *func)
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{
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int ret;
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struct i2400ms *i2400ms = sdio_get_drvdata(func);
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struct device *dev = &func->dev;
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int val;
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d_fnstart(6, dev, "(i2400ms %p)\n", i2400ms);
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val = sdio_readb(func, I2400MS_INTR_STATUS_ADDR, &ret);
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if (ret < 0) {
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dev_err(dev, "RX: Can't read interrupt status: %d\n", ret);
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goto error_no_irq;
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}
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if (!val) {
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dev_err(dev, "RX: BUG? got IRQ but no interrupt ready?\n");
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goto error_no_irq;
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}
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i2400ms_rx(i2400ms);
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error_no_irq:
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d_fnend(6, dev, "(i2400ms %p) = void\n", i2400ms);
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}
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/*
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* Setup SDIO RX
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*
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* Hooks up the IRQ handler and then enables IRQs.
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*/
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int i2400ms_rx_setup(struct i2400ms *i2400ms)
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{
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int result;
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struct sdio_func *func = i2400ms->func;
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struct device *dev = &func->dev;
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struct i2400m *i2400m = &i2400ms->i2400m;
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d_fnstart(5, dev, "(i2400ms %p)\n", i2400ms);
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init_waitqueue_head(&i2400ms->bm_wfa_wq);
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spin_lock(&i2400m->rx_lock);
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i2400ms->bm_wait_result = -EINPROGRESS;
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/*
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* Before we are about to enable the RX interrupt, make sure
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* bm_ack_size is cleared to -EINPROGRESS which indicates
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* no RX interrupt happened yet or the previous interrupt
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* has been handled, we are ready to take the new interrupt
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*/
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i2400ms->bm_ack_size = -EINPROGRESS;
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spin_unlock(&i2400m->rx_lock);
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sdio_claim_host(func);
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result = sdio_claim_irq(func, i2400ms_irq);
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if (result < 0) {
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dev_err(dev, "Cannot claim IRQ: %d\n", result);
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goto error_irq_claim;
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}
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result = 0;
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sdio_writeb(func, 1, I2400MS_INTR_ENABLE_ADDR, &result);
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if (result < 0) {
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sdio_release_irq(func);
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dev_err(dev, "Failed to enable interrupts %d\n", result);
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}
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error_irq_claim:
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sdio_release_host(func);
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d_fnend(5, dev, "(i2400ms %p) = %d\n", i2400ms, result);
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return result;
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}
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/*
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* Tear down SDIO RX
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*
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* Disables IRQs in the device and removes the IRQ handler.
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*/
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void i2400ms_rx_release(struct i2400ms *i2400ms)
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{
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int result;
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struct sdio_func *func = i2400ms->func;
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struct device *dev = &func->dev;
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struct i2400m *i2400m = &i2400ms->i2400m;
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d_fnstart(5, dev, "(i2400ms %p)\n", i2400ms);
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spin_lock(&i2400m->rx_lock);
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i2400ms->bm_ack_size = -EINTR;
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spin_unlock(&i2400m->rx_lock);
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wake_up_all(&i2400ms->bm_wfa_wq);
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sdio_claim_host(func);
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sdio_writeb(func, 0, I2400MS_INTR_ENABLE_ADDR, &result);
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sdio_release_irq(func);
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sdio_release_host(func);
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d_fnend(5, dev, "(i2400ms %p) = %d\n", i2400ms, result);
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}
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