iwmc3200wifi: Add new Intel Wireless Multicomm 802.11 driver

This driver supports Intel's full MAC wireless multicomm 802.11 hardware.
Although the hardware is a 802.11agn device, we currently only support
802.11ag, in managed and ad-hoc mode (no AP mode for now).

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Samuel Ortiz <samuel.ortiz@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 516 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwmc3200wifi/sdio.c b/drivers/net/wireless/iwmc3200wifi/sdio.c
new file mode 100644
index 0000000..edc0a00
--- /dev/null
+++ b/drivers/net/wireless/iwmc3200wifi/sdio.c
@@ -0,0 +1,516 @@
+/*
+ * Intel Wireless Multicomm 3200 WiFi driver
+ *
+ * Copyright (C) 2009 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 <ilw@linux.intel.com>
+ * Samuel Ortiz <samuel.ortiz@intel.com>
+ * Zhu Yi <yi.zhu@intel.com>
+ *
+ */
+
+/*
+ * This is the SDIO bus specific hooks for iwm.
+ * It also is the module's entry point.
+ *
+ * Interesting code paths:
+ * iwm_sdio_probe() (Called by an SDIO bus scan)
+ *  -> iwm_if_alloc() (netdev.c)
+ *      -> iwm_wdev_alloc() (cfg80211.c, allocates and register our wiphy)
+ *          -> wiphy_new()
+ *          -> wiphy_register()
+ *      -> alloc_netdev_mq()
+ *      -> register_netdev()
+ *
+ * iwm_sdio_remove()
+ *  -> iwm_if_free() (netdev.c)
+ *      -> unregister_netdev()
+ *      -> iwm_wdev_free() (cfg80211.c)
+ *          -> wiphy_unregister()
+ *          -> wiphy_free()
+ *
+ * iwm_sdio_isr() (called in process context from the SDIO core code)
+ *  -> queue_work(.., isr_worker)
+ *      -- [async] --> iwm_sdio_isr_worker()
+ *                      -> iwm_rx_handle()
+ */
+
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/debugfs.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/sdio_func.h>
+
+#include "iwm.h"
+#include "debug.h"
+#include "bus.h"
+#include "sdio.h"
+
+static void iwm_sdio_isr_worker(struct work_struct *work)
+{
+	struct iwm_sdio_priv *hw;
+	struct iwm_priv *iwm;
+	struct iwm_rx_info *rx_info;
+	struct sk_buff *skb;
+	u8 *rx_buf;
+	unsigned long rx_size;
+
+	hw = container_of(work, struct iwm_sdio_priv, isr_worker);
+	iwm = hw_to_iwm(hw);
+
+	while (!skb_queue_empty(&iwm->rx_list)) {
+		skb = skb_dequeue(&iwm->rx_list);
+		rx_info = skb_to_rx_info(skb);
+		rx_size = rx_info->rx_size;
+		rx_buf = skb->data;
+
+		IWM_HEXDUMP(iwm, DBG, SDIO, "RX: ", rx_buf, rx_size);
+		if (iwm_rx_handle(iwm, rx_buf, rx_size) < 0)
+			IWM_WARN(iwm, "RX error\n");
+
+		kfree_skb(skb);
+	}
+}
+
+static void iwm_sdio_isr(struct sdio_func *func)
+{
+	struct iwm_priv *iwm;
+	struct iwm_sdio_priv *hw;
+	struct iwm_rx_info *rx_info;
+	struct sk_buff *skb;
+	unsigned long buf_size, read_size;
+	int ret;
+	u8 val;
+
+	hw = sdio_get_drvdata(func);
+	iwm = hw_to_iwm(hw);
+
+	buf_size = hw->blk_size;
+
+	/* We're checking the status */
+	val = sdio_readb(func, IWM_SDIO_INTR_STATUS_ADDR, &ret);
+	if (val == 0 || ret < 0) {
+		IWM_ERR(iwm, "Wrong INTR_STATUS\n");
+		return;
+	}
+
+	/* See if we have free buffers */
+	if (skb_queue_len(&iwm->rx_list) > IWM_RX_LIST_SIZE) {
+		IWM_ERR(iwm, "No buffer for more Rx frames\n");
+		return;
+	}
+
+	/* We first read the transaction size */
+	read_size = sdio_readb(func, IWM_SDIO_INTR_GET_SIZE_ADDR + 1, &ret);
+	read_size = read_size << 8;
+
+	if (ret < 0) {
+		IWM_ERR(iwm, "Couldn't read the xfer size\n");
+		return;
+	}
+
+	/* We need to clear the INT register */
+	sdio_writeb(func, 1, IWM_SDIO_INTR_CLEAR_ADDR, &ret);
+	if (ret < 0) {
+		IWM_ERR(iwm, "Couldn't clear the INT register\n");
+		return;
+	}
+
+	while (buf_size < read_size)
+		buf_size <<= 1;
+
+	skb = dev_alloc_skb(buf_size);
+	if (!skb) {
+		IWM_ERR(iwm, "Couldn't alloc RX skb\n");
+		return;
+	}
+	rx_info = skb_to_rx_info(skb);
+	rx_info->rx_size = read_size;
+	rx_info->rx_buf_size = buf_size;
+
+	/* Now we can read the actual buffer */
+	ret = sdio_memcpy_fromio(func, skb_put(skb, read_size),
+				 IWM_SDIO_DATA_ADDR, read_size);
+
+	/* The skb is put on a driver's specific Rx SKB list */
+	skb_queue_tail(&iwm->rx_list, skb);
+
+	/* We can now schedule the actual worker */
+	queue_work(hw->isr_wq, &hw->isr_worker);
+}
+
+static void iwm_sdio_rx_free(struct iwm_sdio_priv *hw)
+{
+	struct iwm_priv *iwm = hw_to_iwm(hw);
+
+	flush_workqueue(hw->isr_wq);
+
+	skb_queue_purge(&iwm->rx_list);
+}
+
+/* Bus ops */
+static int if_sdio_enable(struct iwm_priv *iwm)
+{
+	struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
+	int ret;
+
+	sdio_claim_host(hw->func);
+
+	ret = sdio_enable_func(hw->func);
+	if (ret) {
+		IWM_ERR(iwm, "Couldn't enable the device: is TOP driver "
+			"loaded and functional?\n");
+		goto release_host;
+	}
+
+	iwm_reset(iwm);
+
+	ret = sdio_claim_irq(hw->func, iwm_sdio_isr);
+	if (ret) {
+		IWM_ERR(iwm, "Failed to claim irq: %d\n", ret);
+		goto release_host;
+	}
+
+	sdio_writeb(hw->func, 1, IWM_SDIO_INTR_ENABLE_ADDR, &ret);
+	if (ret < 0) {
+		IWM_ERR(iwm, "Couldn't enable INTR: %d\n", ret);
+		goto release_irq;
+	}
+
+	sdio_release_host(hw->func);
+
+	IWM_DBG_SDIO(iwm, INFO, "IWM SDIO enable\n");
+
+	return 0;
+
+ release_irq:
+	sdio_release_irq(hw->func);
+ release_host:
+	sdio_release_host(hw->func);
+
+	return ret;
+}
+
+static int if_sdio_disable(struct iwm_priv *iwm)
+{
+	struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
+	int ret;
+
+	iwm_reset(iwm);
+
+	sdio_claim_host(hw->func);
+	sdio_writeb(hw->func, 0, IWM_SDIO_INTR_ENABLE_ADDR, &ret);
+	if (ret < 0)
+		IWM_WARN(iwm, "Couldn't disable INTR: %d\n", ret);
+
+	sdio_release_irq(hw->func);
+	sdio_disable_func(hw->func);
+	sdio_release_host(hw->func);
+
+	iwm_sdio_rx_free(hw);
+
+	IWM_DBG_SDIO(iwm, INFO, "IWM SDIO disable\n");
+
+	return 0;
+}
+
+static int if_sdio_send_chunk(struct iwm_priv *iwm, u8 *buf, int count)
+{
+	struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
+	int aligned_count = ALIGN(count, hw->blk_size);
+	int ret;
+
+	if ((unsigned long)buf & 0x3) {
+		IWM_ERR(iwm, "buf <%p> is not dword aligned\n", buf);
+		/* TODO: Is this a hardware limitation? use get_unligned */
+		return -EINVAL;
+	}
+
+	sdio_claim_host(hw->func);
+	ret = sdio_memcpy_toio(hw->func, IWM_SDIO_DATA_ADDR, buf,
+			       aligned_count);
+	sdio_release_host(hw->func);
+
+	return ret;
+}
+
+/* debugfs hooks */
+static int iwm_debugfs_sdio_open(struct inode *inode, struct file *filp)
+{
+	filp->private_data = inode->i_private;
+	return 0;
+}
+
+static ssize_t iwm_debugfs_sdio_read(struct file *filp, char __user *buffer,
+				     size_t count, loff_t *ppos)
+{
+	struct iwm_priv *iwm = filp->private_data;
+	struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
+	char *buf;
+	u8 cccr;
+	int buf_len = 4096, ret;
+	size_t len = 0;
+
+	if (*ppos != 0)
+		return 0;
+	if (count < sizeof(buf))
+		return -ENOSPC;
+
+	buf = kzalloc(buf_len, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	sdio_claim_host(hw->func);
+
+	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_IOEx, &ret);
+	if (ret) {
+		IWM_ERR(iwm, "Could not read SDIO_CCCR_IOEx\n");
+		goto err;
+	}
+	len += snprintf(buf + len, buf_len - len, "CCCR_IOEx:  0x%x\n", cccr);
+
+	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_IORx, &ret);
+	if (ret) {
+		IWM_ERR(iwm, "Could not read SDIO_CCCR_IORx\n");
+		goto err;
+	}
+	len += snprintf(buf + len, buf_len - len, "CCCR_IORx:  0x%x\n", cccr);
+
+
+	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_IENx, &ret);
+	if (ret) {
+		IWM_ERR(iwm, "Could not read SDIO_CCCR_IENx\n");
+		goto err;
+	}
+	len += snprintf(buf + len, buf_len - len, "CCCR_IENx:  0x%x\n", cccr);
+
+
+	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_INTx, &ret);
+	if (ret) {
+		IWM_ERR(iwm, "Could not read SDIO_CCCR_INTx\n");
+		goto err;
+	}
+	len += snprintf(buf + len, buf_len - len, "CCCR_INTx:  0x%x\n", cccr);
+
+
+	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_ABORT, &ret);
+	if (ret) {
+		IWM_ERR(iwm, "Could not read SDIO_CCCR_ABORTx\n");
+		goto err;
+	}
+	len += snprintf(buf + len, buf_len - len, "CCCR_ABORT: 0x%x\n", cccr);
+
+	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_IF, &ret);
+	if (ret) {
+		IWM_ERR(iwm, "Could not read SDIO_CCCR_IF\n");
+		goto err;
+	}
+	len += snprintf(buf + len, buf_len - len, "CCCR_IF:    0x%x\n", cccr);
+
+
+	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_CAPS, &ret);
+	if (ret) {
+		IWM_ERR(iwm, "Could not read SDIO_CCCR_CAPS\n");
+		goto err;
+	}
+	len += snprintf(buf + len, buf_len - len, "CCCR_CAPS:  0x%x\n", cccr);
+
+	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_CIS, &ret);
+	if (ret) {
+		IWM_ERR(iwm, "Could not read SDIO_CCCR_CIS\n");
+		goto err;
+	}
+	len += snprintf(buf + len, buf_len - len, "CCCR_CIS:   0x%x\n", cccr);
+
+	ret = simple_read_from_buffer(buffer, len, ppos, buf, buf_len);
+err:
+	sdio_release_host(hw->func);
+
+	kfree(buf);
+
+	return ret;
+}
+
+static const struct file_operations iwm_debugfs_sdio_fops = {
+	.owner =	THIS_MODULE,
+	.open =		iwm_debugfs_sdio_open,
+	.read =		iwm_debugfs_sdio_read,
+};
+
+static int if_sdio_debugfs_init(struct iwm_priv *iwm, struct dentry *parent_dir)
+{
+	int result;
+	struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
+
+	hw->cccr_dentry = debugfs_create_file("cccr", 0200,
+					      parent_dir, iwm,
+					      &iwm_debugfs_sdio_fops);
+	result = PTR_ERR(hw->cccr_dentry);
+	if (IS_ERR(hw->cccr_dentry) && (result != -ENODEV)) {
+		IWM_ERR(iwm, "Couldn't create CCCR entry: %d\n", result);
+		return result;
+	}
+
+	return 0;
+}
+
+static void if_sdio_debugfs_exit(struct iwm_priv *iwm)
+{
+	struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
+
+	debugfs_remove(hw->cccr_dentry);
+}
+
+static struct iwm_if_ops if_sdio_ops = {
+	.enable = if_sdio_enable,
+	.disable = if_sdio_disable,
+	.send_chunk = if_sdio_send_chunk,
+	.debugfs_init = if_sdio_debugfs_init,
+	.debugfs_exit = if_sdio_debugfs_exit,
+	.umac_name = "iwmc3200wifi-umac-sdio.bin",
+	.calib_lmac_name = "iwmc3200wifi-lmac-calib-sdio.bin",
+	.lmac_name = "iwmc3200wifi-lmac-sdio.bin",
+};
+
+static int iwm_sdio_probe(struct sdio_func *func,
+			  const struct sdio_device_id *id)
+{
+	struct iwm_priv *iwm;
+	struct iwm_sdio_priv *hw;
+	struct device *dev = &func->dev;
+	int ret;
+
+	/* check if TOP has already initialized the card */
+	sdio_claim_host(func);
+	ret = sdio_enable_func(func);
+	if (ret) {
+		dev_err(dev, "wait for TOP to enable the device\n");
+		sdio_release_host(func);
+		return ret;
+	}
+
+	ret = sdio_set_block_size(func, IWM_SDIO_BLK_SIZE);
+
+	sdio_disable_func(func);
+	sdio_release_host(func);
+
+	if (ret < 0) {
+		dev_err(dev, "Failed to set block size: %d\n", ret);
+		return ret;
+	}
+
+	iwm = iwm_if_alloc(sizeof(struct iwm_sdio_priv), dev, &if_sdio_ops);
+	if (IS_ERR(iwm)) {
+		dev_err(dev, "allocate SDIO interface failed\n");
+		return PTR_ERR(iwm);
+	}
+
+	hw = iwm_private(iwm);
+	hw->iwm = iwm;
+
+	ret = iwm_debugfs_init(iwm);
+	if (ret < 0) {
+		IWM_ERR(iwm, "Debugfs registration failed\n");
+		goto if_free;
+	}
+
+	sdio_set_drvdata(func, hw);
+
+	hw->func = func;
+	hw->blk_size = IWM_SDIO_BLK_SIZE;
+
+	hw->isr_wq = create_singlethread_workqueue(KBUILD_MODNAME "_sdio");
+	if (!hw->isr_wq) {
+		ret = -ENOMEM;
+		goto debugfs_exit;
+	}
+
+	INIT_WORK(&hw->isr_worker, iwm_sdio_isr_worker);
+
+	dev_info(dev, "IWM SDIO probe\n");
+
+	return 0;
+
+ debugfs_exit:
+	iwm_debugfs_exit(iwm);
+ if_free:
+	iwm_if_free(iwm);
+	return ret;
+}
+
+static void iwm_sdio_remove(struct sdio_func *func)
+{
+	struct iwm_sdio_priv *hw = sdio_get_drvdata(func);
+	struct iwm_priv *iwm = hw_to_iwm(hw);
+	struct device *dev = &func->dev;
+
+	iwm_debugfs_exit(iwm);
+	iwm_if_free(iwm);
+	destroy_workqueue(hw->isr_wq);
+
+	sdio_set_drvdata(func, NULL);
+
+	dev_info(dev, "IWM SDIO remove\n");
+
+	return;
+}
+
+static const struct sdio_device_id iwm_sdio_ids[] = {
+	{ SDIO_DEVICE(SDIO_VENDOR_ID_INTEL, SDIO_DEVICE_ID_IWM) },
+	{ /* end: all zeroes */	},
+};
+MODULE_DEVICE_TABLE(sdio, iwm_sdio_ids);
+
+static struct sdio_driver iwm_sdio_driver = {
+	.name		= "iwm_sdio",
+	.id_table	= iwm_sdio_ids,
+	.probe		= iwm_sdio_probe,
+	.remove		= iwm_sdio_remove,
+};
+
+static int __init iwm_sdio_init_module(void)
+{
+	int ret;
+
+	ret = sdio_register_driver(&iwm_sdio_driver);
+
+	return ret;
+}
+
+static void __exit iwm_sdio_exit_module(void)
+{
+	sdio_unregister_driver(&iwm_sdio_driver);
+}
+
+module_init(iwm_sdio_init_module);
+module_exit(iwm_sdio_exit_module);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR(IWM_COPYRIGHT " " IWM_AUTHOR);