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* Intel Wireless Multicomm 3200 WiFi driver
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* Copyright (C) 2009 Intel Corporation. All rights reserved.
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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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* * 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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* * 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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* 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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* Intel Corporation <ilw@linux.intel.com>
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* Samuel Ortiz <samuel.ortiz@intel.com>
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* Zhu Yi <yi.zhu@intel.com>
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* This is the SDIO bus specific hooks for iwm.
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* It also is the module's entry point.
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* Interesting code paths:
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* iwm_sdio_probe() (Called by an SDIO bus scan)
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* -> iwm_if_alloc() (netdev.c)
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* -> iwm_wdev_alloc() (cfg80211.c, allocates and register our wiphy)
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* -> alloc_netdev_mq()
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* -> register_netdev()
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* -> iwm_if_free() (netdev.c)
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* -> unregister_netdev()
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* -> iwm_wdev_free() (cfg80211.c)
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* -> wiphy_unregister()
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* iwm_sdio_isr() (called in process context from the SDIO core code)
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* -> queue_work(.., isr_worker)
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* -- [async] --> iwm_sdio_isr_worker()
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/netdevice.h>
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#include <linux/debugfs.h>
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#include <linux/mmc/sdio_ids.h>
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#include <linux/mmc/sdio.h>
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#include <linux/mmc/sdio_func.h>
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static void iwm_sdio_isr_worker(struct work_struct *work)
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struct iwm_sdio_priv *hw;
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struct iwm_rx_info *rx_info;
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unsigned long rx_size;
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hw = container_of(work, struct iwm_sdio_priv, isr_worker);
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while (!skb_queue_empty(&iwm->rx_list)) {
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skb = skb_dequeue(&iwm->rx_list);
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rx_info = skb_to_rx_info(skb);
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rx_size = rx_info->rx_size;
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IWM_HEXDUMP(iwm, DBG, SDIO, "RX: ", rx_buf, rx_size);
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if (iwm_rx_handle(iwm, rx_buf, rx_size) < 0)
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IWM_WARN(iwm, "RX error\n");
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static void iwm_sdio_isr(struct sdio_func *func)
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struct iwm_priv *iwm;
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struct iwm_sdio_priv *hw;
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struct iwm_rx_info *rx_info;
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unsigned long buf_size, read_size;
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hw = sdio_get_drvdata(func);
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buf_size = hw->blk_size;
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/* We're checking the status */
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val = sdio_readb(func, IWM_SDIO_INTR_STATUS_ADDR, &ret);
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if (val == 0 || ret < 0) {
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IWM_ERR(iwm, "Wrong INTR_STATUS\n");
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/* See if we have free buffers */
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if (skb_queue_len(&iwm->rx_list) > IWM_RX_LIST_SIZE) {
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IWM_ERR(iwm, "No buffer for more Rx frames\n");
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/* We first read the transaction size */
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read_size = sdio_readb(func, IWM_SDIO_INTR_GET_SIZE_ADDR + 1, &ret);
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read_size = read_size << 8;
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IWM_ERR(iwm, "Couldn't read the xfer size\n");
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/* We need to clear the INT register */
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sdio_writeb(func, 1, IWM_SDIO_INTR_CLEAR_ADDR, &ret);
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IWM_ERR(iwm, "Couldn't clear the INT register\n");
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while (buf_size < read_size)
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skb = dev_alloc_skb(buf_size);
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IWM_ERR(iwm, "Couldn't alloc RX skb\n");
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rx_info = skb_to_rx_info(skb);
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rx_info->rx_size = read_size;
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rx_info->rx_buf_size = buf_size;
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/* Now we can read the actual buffer */
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ret = sdio_memcpy_fromio(func, skb_put(skb, read_size),
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IWM_SDIO_DATA_ADDR, read_size);
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/* The skb is put on a driver's specific Rx SKB list */
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skb_queue_tail(&iwm->rx_list, skb);
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/* We can now schedule the actual worker */
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queue_work(hw->isr_wq, &hw->isr_worker);
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static void iwm_sdio_rx_free(struct iwm_sdio_priv *hw)
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struct iwm_priv *iwm = hw_to_iwm(hw);
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flush_workqueue(hw->isr_wq);
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skb_queue_purge(&iwm->rx_list);
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static int if_sdio_enable(struct iwm_priv *iwm)
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struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
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sdio_claim_host(hw->func);
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ret = sdio_enable_func(hw->func);
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IWM_ERR(iwm, "Couldn't enable the device: is TOP driver "
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"loaded and functional?\n");
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ret = sdio_claim_irq(hw->func, iwm_sdio_isr);
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IWM_ERR(iwm, "Failed to claim irq: %d\n", ret);
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sdio_writeb(hw->func, 1, IWM_SDIO_INTR_ENABLE_ADDR, &ret);
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IWM_ERR(iwm, "Couldn't enable INTR: %d\n", ret);
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sdio_release_host(hw->func);
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IWM_DBG_SDIO(iwm, INFO, "IWM SDIO enable\n");
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sdio_release_irq(hw->func);
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sdio_release_host(hw->func);
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static int if_sdio_disable(struct iwm_priv *iwm)
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struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
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sdio_claim_host(hw->func);
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sdio_writeb(hw->func, 0, IWM_SDIO_INTR_ENABLE_ADDR, &ret);
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IWM_WARN(iwm, "Couldn't disable INTR: %d\n", ret);
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sdio_release_irq(hw->func);
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sdio_disable_func(hw->func);
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sdio_release_host(hw->func);
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iwm_sdio_rx_free(hw);
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IWM_DBG_SDIO(iwm, INFO, "IWM SDIO disable\n");
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static int if_sdio_send_chunk(struct iwm_priv *iwm, u8 *buf, int count)
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struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
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int aligned_count = ALIGN(count, hw->blk_size);
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if ((unsigned long)buf & 0x3) {
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IWM_ERR(iwm, "buf <%p> is not dword aligned\n", buf);
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/* TODO: Is this a hardware limitation? use get_unligned */
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sdio_claim_host(hw->func);
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ret = sdio_memcpy_toio(hw->func, IWM_SDIO_DATA_ADDR, buf,
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sdio_release_host(hw->func);
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static int iwm_debugfs_sdio_open(struct inode *inode, struct file *filp)
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filp->private_data = inode->i_private;
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static ssize_t iwm_debugfs_sdio_read(struct file *filp, char __user *buffer,
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size_t count, loff_t *ppos)
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struct iwm_priv *iwm = filp->private_data;
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struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
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int buf_len = 4096, ret;
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if (count < sizeof(buf))
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buf = kzalloc(buf_len, GFP_KERNEL);
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sdio_claim_host(hw->func);
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cccr = sdio_f0_readb(hw->func, SDIO_CCCR_IOEx, &ret);
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IWM_ERR(iwm, "Could not read SDIO_CCCR_IOEx\n");
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len += snprintf(buf + len, buf_len - len, "CCCR_IOEx: 0x%x\n", cccr);
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cccr = sdio_f0_readb(hw->func, SDIO_CCCR_IORx, &ret);
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IWM_ERR(iwm, "Could not read SDIO_CCCR_IORx\n");
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len += snprintf(buf + len, buf_len - len, "CCCR_IORx: 0x%x\n", cccr);
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cccr = sdio_f0_readb(hw->func, SDIO_CCCR_IENx, &ret);
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IWM_ERR(iwm, "Could not read SDIO_CCCR_IENx\n");
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len += snprintf(buf + len, buf_len - len, "CCCR_IENx: 0x%x\n", cccr);
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cccr = sdio_f0_readb(hw->func, SDIO_CCCR_INTx, &ret);
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IWM_ERR(iwm, "Could not read SDIO_CCCR_INTx\n");
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len += snprintf(buf + len, buf_len - len, "CCCR_INTx: 0x%x\n", cccr);
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cccr = sdio_f0_readb(hw->func, SDIO_CCCR_ABORT, &ret);
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IWM_ERR(iwm, "Could not read SDIO_CCCR_ABORTx\n");
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len += snprintf(buf + len, buf_len - len, "CCCR_ABORT: 0x%x\n", cccr);
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cccr = sdio_f0_readb(hw->func, SDIO_CCCR_IF, &ret);
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IWM_ERR(iwm, "Could not read SDIO_CCCR_IF\n");
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len += snprintf(buf + len, buf_len - len, "CCCR_IF: 0x%x\n", cccr);
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cccr = sdio_f0_readb(hw->func, SDIO_CCCR_CAPS, &ret);
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IWM_ERR(iwm, "Could not read SDIO_CCCR_CAPS\n");
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len += snprintf(buf + len, buf_len - len, "CCCR_CAPS: 0x%x\n", cccr);
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cccr = sdio_f0_readb(hw->func, SDIO_CCCR_CIS, &ret);
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IWM_ERR(iwm, "Could not read SDIO_CCCR_CIS\n");
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len += snprintf(buf + len, buf_len - len, "CCCR_CIS: 0x%x\n", cccr);
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ret = simple_read_from_buffer(buffer, len, ppos, buf, buf_len);
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sdio_release_host(hw->func);
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static const struct file_operations iwm_debugfs_sdio_fops = {
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.owner = THIS_MODULE,
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.open = iwm_debugfs_sdio_open,
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.read = iwm_debugfs_sdio_read,
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.llseek = default_llseek,
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static void if_sdio_debugfs_init(struct iwm_priv *iwm, struct dentry *parent_dir)
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struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
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hw->cccr_dentry = debugfs_create_file("cccr", 0200,
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&iwm_debugfs_sdio_fops);
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static void if_sdio_debugfs_exit(struct iwm_priv *iwm)
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struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
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debugfs_remove(hw->cccr_dentry);
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static struct iwm_if_ops if_sdio_ops = {
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.enable = if_sdio_enable,
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.disable = if_sdio_disable,
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.send_chunk = if_sdio_send_chunk,
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.debugfs_init = if_sdio_debugfs_init,
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.debugfs_exit = if_sdio_debugfs_exit,
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.umac_name = "iwmc3200wifi-umac-sdio.bin",
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.calib_lmac_name = "iwmc3200wifi-calib-sdio.bin",
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.lmac_name = "iwmc3200wifi-lmac-sdio.bin",
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MODULE_FIRMWARE("iwmc3200wifi-umac-sdio.bin");
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MODULE_FIRMWARE("iwmc3200wifi-calib-sdio.bin");
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MODULE_FIRMWARE("iwmc3200wifi-lmac-sdio.bin");
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static int iwm_sdio_probe(struct sdio_func *func,
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const struct sdio_device_id *id)
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struct iwm_priv *iwm;
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struct iwm_sdio_priv *hw;
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struct device *dev = &func->dev;
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/* check if TOP has already initialized the card */
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sdio_claim_host(func);
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ret = sdio_enable_func(func);
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dev_err(dev, "wait for TOP to enable the device\n");
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sdio_release_host(func);
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ret = sdio_set_block_size(func, IWM_SDIO_BLK_SIZE);
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sdio_disable_func(func);
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sdio_release_host(func);
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dev_err(dev, "Failed to set block size: %d\n", ret);
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iwm = iwm_if_alloc(sizeof(struct iwm_sdio_priv), dev, &if_sdio_ops);
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dev_err(dev, "allocate SDIO interface failed\n");
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hw = iwm_private(iwm);
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iwm_debugfs_init(iwm);
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sdio_set_drvdata(func, hw);
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hw->blk_size = IWM_SDIO_BLK_SIZE;
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hw->isr_wq = create_singlethread_workqueue(KBUILD_MODNAME "_sdio");
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INIT_WORK(&hw->isr_worker, iwm_sdio_isr_worker);
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ret = iwm_if_add(iwm);
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dev_err(dev, "add SDIO interface failed\n");
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dev_info(dev, "IWM SDIO probe\n");
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destroy_workqueue(hw->isr_wq);
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iwm_debugfs_exit(iwm);
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static void iwm_sdio_remove(struct sdio_func *func)
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struct iwm_sdio_priv *hw = sdio_get_drvdata(func);
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struct iwm_priv *iwm = hw_to_iwm(hw);
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struct device *dev = &func->dev;
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destroy_workqueue(hw->isr_wq);
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iwm_debugfs_exit(iwm);
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sdio_set_drvdata(func, NULL);
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dev_info(dev, "IWM SDIO remove\n");
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static const struct sdio_device_id iwm_sdio_ids[] = {
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{ SDIO_DEVICE(SDIO_VENDOR_ID_INTEL, 0x1403) },
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{ SDIO_DEVICE(SDIO_VENDOR_ID_INTEL, 0x1408) },
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{ /* end: all zeroes */ },
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MODULE_DEVICE_TABLE(sdio, iwm_sdio_ids);
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static struct sdio_driver iwm_sdio_driver = {
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.id_table = iwm_sdio_ids,
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.probe = iwm_sdio_probe,
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.remove = iwm_sdio_remove,
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static int __init iwm_sdio_init_module(void)
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return sdio_register_driver(&iwm_sdio_driver);
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static void __exit iwm_sdio_exit_module(void)
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sdio_unregister_driver(&iwm_sdio_driver);
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module_init(iwm_sdio_init_module);
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module_exit(iwm_sdio_exit_module);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR(IWM_COPYRIGHT " " IWM_AUTHOR);