drivers/net/wimax/i2400m/sdio.c - kernel/msm - Gitiles

 /*
  * Intel Wireless WiMAX Connection 2400m
  * Linux driver model glue for the SDIO device, reset & fw upload
  *
  *
  * Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
  * Dirk Brandewie <dirk.j.brandewie@intel.com>
  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  * Yanir Lubetkin <yanirx.lubetkin@intel.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License version
  * 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
  *
  *
  * See i2400m-sdio.h for a general description of this driver.
  *
  * This file implements driver model glue, and hook ups for the
  * generic driver to implement the bus-specific functions (device
  * communication setup/tear down, firmware upload and resetting).
  *
  * ROADMAP
  *
  * i2400m_probe()
  *   alloc_netdev()
  *     i2400ms_netdev_setup()
  *       i2400ms_init()
  *       i2400m_netdev_setup()
  *   i2400ms_enable_function()
  *   i2400m_setup()
  *
  * i2400m_remove()
  *     i2400m_release()
  *     free_netdev(net_dev)
  *
  * i2400ms_bus_reset()            Called by i2400m->bus_reset
  *   __i2400ms_reset()
  *     __i2400ms_send_barker()
  *
  * i2400ms_bus_dev_start()        Called by i2400m_dev_start() [who is
  *   i2400ms_tx_setup()           called by i2400m_setup()]
  *   i2400ms_rx_setup()
  *
  * i2400ms_bus_dev_stop()         Called by i2400m_dev_stop() [who is
  *   i2400ms_rx_release()         is called by i2400m_release()]
  *   i2400ms_tx_release()
  *
  */

 #include <linux/debugfs.h>
 #include <linux/mmc/sdio.h>
 #include <linux/mmc/sdio_func.h>
 #include "i2400m-sdio.h"
 #include <linux/wimax/i2400m.h>

 #define D_SUBMODULE main
 #include "sdio-debug-levels.h"

 /* IOE WiMAX function timeout in seconds */
 static int ioe_timeout = 2;
 module_param(ioe_timeout, int, 0);

 /* Our firmware file name */
 #define I2400MS_FW_FILE_NAME "i2400m-fw-sdio-" I2400M_FW_VERSION ".sbcf"

 /*
  * Enable the SDIO function
  *
  * Tries to enable the SDIO function; might fail if it is still not
  * ready (in some hardware, the SDIO WiMAX function is only enabled
  * when we ask it to explicitly doing). Tries until a timeout is
  * reached.
  *
  * The reverse of this is...sdio_disable_function()
  *
  * Returns: 0 if the SDIO function was enabled, < 0 errno code on
  *     error (-ENODEV when it was unable to enable the function).
  */
 static
 int i2400ms_enable_function(struct sdio_func *func)
 {
 	u64 timeout;
 	int err;
 	struct device *dev = &func->dev;

 	d_fnstart(3, dev, "(func %p)\n", func);
 	/* Setup timeout (FIXME: This needs to read the CIS table to
 	 * get a real timeout) and then wait for the device to signal
 	 * it is ready */
 	timeout = get_jiffies_64() + ioe_timeout * HZ;
 	err = -ENODEV;
 	while (err != 0 && time_before64(get_jiffies_64(), timeout)) {
 		sdio_claim_host(func);
 		err = sdio_enable_func(func);
 		if (0 == err) {
 			sdio_release_host(func);
 			d_printf(2, dev, "SDIO function enabled\n");
 			goto function_enabled;
 		}
 		d_printf(2, dev, "SDIO function failed to enable: %d\n", err);
 		sdio_disable_func(func);
 		sdio_release_host(func);
 		msleep(I2400MS_INIT_SLEEP_INTERVAL);
 	}
 	/* If timed out, device is not there yet -- get -ENODEV so
 	 * the device driver core will retry later on. */
 	if (err == -ETIME) {
 		dev_err(dev, "Can't enable WiMAX function; "
 			" has the function been enabled?\n");
 		err = -ENODEV;
 	}
 function_enabled:
 	d_fnend(3, dev, "(func %p) = %d\n", func, err);
 	return err;
 }


 /*
  * Setup driver resources needed to communicate with the device
  *
  * The fw needs some time to settle, and it was just uploaded,
  * so give it a break first. I'd prefer to just wait for the device to
  * send something, but seems the poking we do to enable SDIO stuff
  * interferes with it, so just give it a break before starting...
  */
 static
 int i2400ms_bus_dev_start(struct i2400m *i2400m)
 {
 	int result;
 	struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
 	struct sdio_func *func = i2400ms->func;
 	struct device *dev = &func->dev;

 	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
 	msleep(200);
 	result = i2400ms_rx_setup(i2400ms);
 	if (result < 0)
 		goto error_rx_setup;
 	result = i2400ms_tx_setup(i2400ms);
 	if (result < 0)
 		goto error_tx_setup;
 	d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
 	return result;

 	i2400ms_tx_release(i2400ms);
 error_tx_setup:
 	i2400ms_rx_release(i2400ms);
 error_rx_setup:
 	d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
 	return result;
 }


 static
 void i2400ms_bus_dev_stop(struct i2400m *i2400m)
 {
 	struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
 	struct sdio_func *func = i2400ms->func;
 	struct device *dev = &func->dev;

 	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
 	i2400ms_rx_release(i2400ms);
 	i2400ms_tx_release(i2400ms);
 	d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
 }


 /*
  * Sends a barker buffer to the device
  *
  * This helper will allocate a kmalloced buffer and use it to transmit
  * (then free it). Reason for this is that the SDIO host controller
  * expects alignment (unknown exactly which) which the stack won't
  * really provide and certain arches/host-controller combinations
  * cannot use stack/vmalloc/text areas for DMA transfers.
  */
 static
 int __i2400ms_send_barker(struct i2400ms *i2400ms,
 			  const __le32 *barker, size_t barker_size)
 {
 	int  ret;
 	struct sdio_func *func = i2400ms->func;
 	struct device *dev = &func->dev;
 	void *buffer;

 	ret = -ENOMEM;
 	buffer = kmalloc(I2400MS_BLK_SIZE, GFP_KERNEL);
 	if (buffer == NULL)
 		goto error_kzalloc;

 	memcpy(buffer, barker, barker_size);
 	sdio_claim_host(func);
 	ret = sdio_memcpy_toio(func, 0, buffer, I2400MS_BLK_SIZE);
 	sdio_release_host(func);

 	if (ret < 0)
 		d_printf(0, dev, "E: barker error: %d\n", ret);

 	kfree(buffer);
 error_kzalloc:
 	return ret;
 }


 /*
  * Reset a device at different levels (warm, cold or bus)
  *
  * @i2400ms: device descriptor
  * @reset_type: soft, warm or bus reset (I2400M_RT_WARM/SOFT/BUS)
  *
  * FIXME: not tested -- need to confirm expected effects
  *
  * Warm and cold resets get an SDIO reset if they fail (unimplemented)
  *
  * Warm reset:
  *
  * The device will be fully reset internally, but won't be
  * disconnected from the USB bus (so no reenumeration will
  * happen). Firmware upload will be neccessary.
  *
  * The device will send a reboot barker in the notification endpoint
  * that will trigger the driver to reinitialize the state
  * automatically from notif.c:i2400m_notification_grok() into
  * i2400m_dev_bootstrap_delayed().
  *
  * Cold and bus (USB) reset:
  *
  * The device will be fully reset internally, disconnected from the
  * USB bus an a reenumeration will happen. Firmware upload will be
  * neccessary. Thus, we don't do any locking or struct
  * reinitialization, as we are going to be fully disconnected and
  * reenumerated.
  *
  * Note we need to return -ENODEV if a warm reset was requested and we
  * had to resort to a bus reset. See i2400m_op_reset(), wimax_reset()
  * and wimax_dev->op_reset.
  *
  * WARNING: no driver state saved/fixed
  */
 static
 int i2400ms_bus_reset(struct i2400m *i2400m, enum i2400m_reset_type rt)
 {
 	int result;
 	struct i2400ms *i2400ms =
 		container_of(i2400m, struct i2400ms, i2400m);
 	struct device *dev = i2400m_dev(i2400m);
 	static const __le32 i2400m_WARM_BOOT_BARKER[4] = {
 		cpu_to_le32(I2400M_WARM_RESET_BARKER),
 		cpu_to_le32(I2400M_WARM_RESET_BARKER),
 		cpu_to_le32(I2400M_WARM_RESET_BARKER),
 		cpu_to_le32(I2400M_WARM_RESET_BARKER),
 	};
 	static const __le32 i2400m_COLD_BOOT_BARKER[4] = {
 		cpu_to_le32(I2400M_COLD_RESET_BARKER),
 		cpu_to_le32(I2400M_COLD_RESET_BARKER),
 		cpu_to_le32(I2400M_COLD_RESET_BARKER),
 		cpu_to_le32(I2400M_COLD_RESET_BARKER),
 	};

 	if (rt == I2400M_RT_WARM)
 		result = __i2400ms_send_barker(i2400ms, i2400m_WARM_BOOT_BARKER,
 					       sizeof(i2400m_WARM_BOOT_BARKER));
 	else if (rt == I2400M_RT_COLD)
 		result = __i2400ms_send_barker(i2400ms, i2400m_COLD_BOOT_BARKER,
 					       sizeof(i2400m_COLD_BOOT_BARKER));
 	else if (rt == I2400M_RT_BUS) {
 do_bus_reset:
 		dev_err(dev, "FIXME: SDIO bus reset not implemented\n");
 		result = rt == I2400M_RT_WARM ? -ENODEV : -ENOSYS;
 	} else
 		BUG();
 	if (result < 0 && rt != I2400M_RT_BUS) {
 		dev_err(dev, "%s reset failed (%d); trying SDIO reset\n",
 			rt == I2400M_RT_WARM ? "warm" : "cold", result);
 		rt = I2400M_RT_BUS;
 		goto do_bus_reset;
 	}
 	return result;
 }


 static
 void i2400ms_netdev_setup(struct net_device *net_dev)
 {
 	struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
 	struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
 	i2400ms_init(i2400ms);
 	i2400m_netdev_setup(net_dev);
 }


 /*
  * Debug levels control; see debug.h
  */
 struct d_level D_LEVEL[] = {
 	D_SUBMODULE_DEFINE(main),
 	D_SUBMODULE_DEFINE(tx),
 	D_SUBMODULE_DEFINE(rx),
 	D_SUBMODULE_DEFINE(fw),
 };
 size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);


 #define __debugfs_register(prefix, name, parent)			\
 do {									\
 	result = d_level_register_debugfs(prefix, name, parent);	\
 	if (result < 0)							\
 		goto error;						\
 } while (0)


 static
 int i2400ms_debugfs_add(struct i2400ms *i2400ms)
 {
 	int result;
 	struct dentry *dentry = i2400ms->i2400m.wimax_dev.debugfs_dentry;

 	dentry = debugfs_create_dir("i2400m-usb", dentry);
 	result = PTR_ERR(dentry);
 	if (IS_ERR(dentry)) {
 		if (result == -ENODEV)
 			result = 0;	/* No debugfs support */
 		goto error;
 	}
 	i2400ms->debugfs_dentry = dentry;
 	__debugfs_register("dl_", main, dentry);
 	__debugfs_register("dl_", tx, dentry);
 	__debugfs_register("dl_", rx, dentry);
 	__debugfs_register("dl_", fw, dentry);

 	return 0;

 error:
 	debugfs_remove_recursive(i2400ms->debugfs_dentry);
 	return result;
 }


 /*
  * Probe a i2400m interface and register it
  *
  * @func:    SDIO function
  * @id:      SDIO device ID
  * @returns: 0 if ok, < 0 errno code on error.
  *
  * Alloc a net device, initialize the bus-specific details and then
  * calls the bus-generic initialization routine. That will register
  * the wimax and netdev devices, upload the firmware [using
  * _bus_bm_*()], call _bus_dev_start() to finalize the setup of the
  * communication with the device and then will start to talk to it to
  * finnish setting it up.
  *
  * Initialization is tricky; some instances of the hw are packed with
  * others in a way that requires a third driver that enables the WiMAX
  * function. In those cases, we can't enable the SDIO function and
  * we'll return with -ENODEV. When the driver that enables the WiMAX
  * function does its thing, it has to do a bus_rescan_devices() on the
  * SDIO bus so this driver is called again to enumerate the WiMAX
  * function.
  */
 static
 int i2400ms_probe(struct sdio_func *func,
 		  const struct sdio_device_id *id)
 {
 	int result;
 	struct net_device *net_dev;
 	struct device *dev = &func->dev;
 	struct i2400m *i2400m;
 	struct i2400ms *i2400ms;

 	/* Allocate instance [calls i2400m_netdev_setup() on it]. */
 	result = -ENOMEM;
 	net_dev = alloc_netdev(sizeof(*i2400ms), "wmx%d",
 			       i2400ms_netdev_setup);
 	if (net_dev == NULL) {
 		dev_err(dev, "no memory for network device instance\n");
 		goto error_alloc_netdev;
 	}
 	SET_NETDEV_DEV(net_dev, dev);
 	i2400m = net_dev_to_i2400m(net_dev);
 	i2400ms = container_of(i2400m, struct i2400ms, i2400m);
 	i2400m->wimax_dev.net_dev = net_dev;
 	i2400ms->func = func;
 	sdio_set_drvdata(func, i2400ms);

 	i2400m->bus_tx_block_size = I2400MS_BLK_SIZE;
 	i2400m->bus_pl_size_max = I2400MS_PL_SIZE_MAX;
 	i2400m->bus_dev_start = i2400ms_bus_dev_start;
 	i2400m->bus_dev_stop = i2400ms_bus_dev_stop;
 	i2400m->bus_tx_kick = i2400ms_bus_tx_kick;
 	i2400m->bus_reset = i2400ms_bus_reset;
 	i2400m->bus_bm_cmd_send = i2400ms_bus_bm_cmd_send;
 	i2400m->bus_bm_wait_for_ack = i2400ms_bus_bm_wait_for_ack;
 	i2400m->bus_fw_name = I2400MS_FW_FILE_NAME;
 	i2400m->bus_bm_mac_addr_impaired = 1;

 	result = i2400ms_enable_function(i2400ms->func);
 	if (result < 0) {
 		dev_err(dev, "Cannot enable SDIO function: %d\n", result);
 		goto error_func_enable;
 	}

 	sdio_claim_host(func);
 	result = sdio_set_block_size(func, I2400MS_BLK_SIZE);
 	if (result < 0) {
 		dev_err(dev, "Failed to set block size: %d\n", result);
 		goto error_set_blk_size;
 	}
 	sdio_release_host(func);

 	result = i2400m_setup(i2400m, I2400M_BRI_NO_REBOOT);
 	if (result < 0) {
 		dev_err(dev, "cannot setup device: %d\n", result);
 		goto error_setup;
 	}

 	result = i2400ms_debugfs_add(i2400ms);
 	if (result < 0) {
 		dev_err(dev, "cannot create SDIO debugfs: %d\n",
 			result);
 		goto error_debugfs_add;
 	}
 	return 0;

 error_debugfs_add:
 	i2400m_release(i2400m);
 error_setup:
 	sdio_set_drvdata(func, NULL);
 	sdio_claim_host(func);
 error_set_blk_size:
 	sdio_disable_func(func);
 	sdio_release_host(func);
 error_func_enable:
 	free_netdev(net_dev);
 error_alloc_netdev:
 	return result;
 }


 static
 void i2400ms_remove(struct sdio_func *func)
 {
 	struct device *dev = &func->dev;
 	struct i2400ms *i2400ms = sdio_get_drvdata(func);
 	struct i2400m *i2400m = &i2400ms->i2400m;
 	struct net_device *net_dev = i2400m->wimax_dev.net_dev;

 	d_fnstart(3, dev, "SDIO func %p\n", func);
 	debugfs_remove_recursive(i2400ms->debugfs_dentry);
 	i2400m_release(i2400m);
 	sdio_set_drvdata(func, NULL);
 	sdio_claim_host(func);
 	sdio_disable_func(func);
 	sdio_release_host(func);
 	free_netdev(net_dev);
 	d_fnend(3, dev, "SDIO func %p\n", func);
 }

 enum {
 	I2400MS_INTEL_VID = 0x89,
 };

 static
 const struct sdio_device_id i2400ms_sdio_ids[] = {
 	/* Intel: i2400m WiMAX over SDIO */
 	{ SDIO_DEVICE(I2400MS_INTEL_VID, 0x1402) },
 	{ }, 			/* end: all zeroes */
 };
 MODULE_DEVICE_TABLE(sdio, i2400ms_sdio_ids);


 static
 struct sdio_driver i2400m_sdio_driver = {
 	.name		= KBUILD_MODNAME,
 	.probe		= i2400ms_probe,
 	.remove		= i2400ms_remove,
 	.id_table	= i2400ms_sdio_ids,
 };


 static
 int __init i2400ms_driver_init(void)
 {
 	return sdio_register_driver(&i2400m_sdio_driver);
 }
 module_init(i2400ms_driver_init);


 static
 void __exit i2400ms_driver_exit(void)
 {
 	flush_scheduled_work();	/* for the stuff we schedule */
 	sdio_unregister_driver(&i2400m_sdio_driver);
 }
 module_exit(i2400ms_driver_exit);


 MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>");
 MODULE_DESCRIPTION("Intel 2400M WiMAX networking for SDIO");
 MODULE_LICENSE("GPL");
 MODULE_FIRMWARE(I2400MS_FW_FILE_NAME);
	/*
	* Intel Wireless WiMAX Connection 2400m
	* Linux driver model glue for the SDIO device, reset & fw upload
	*
	*
	* Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
	* Dirk Brandewie <dirk.j.brandewie@intel.com>
	* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
	* Yanir Lubetkin <yanirx.lubetkin@intel.com>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License version
	* 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	* 02110-1301, USA.
	*
	*
	* See i2400m-sdio.h for a general description of this driver.
	*
	* This file implements driver model glue, and hook ups for the
	* generic driver to implement the bus-specific functions (device
	* communication setup/tear down, firmware upload and resetting).
	*
	* ROADMAP
	*
	* i2400m_probe()
	* alloc_netdev()
	* i2400ms_netdev_setup()
	* i2400ms_init()
	* i2400m_netdev_setup()
	* i2400ms_enable_function()
	* i2400m_setup()
	*
	* i2400m_remove()
	* i2400m_release()
	* free_netdev(net_dev)
	*
	* i2400ms_bus_reset() Called by i2400m->bus_reset
	* __i2400ms_reset()
	* __i2400ms_send_barker()
	*
	* i2400ms_bus_dev_start() Called by i2400m_dev_start() [who is
	* i2400ms_tx_setup() called by i2400m_setup()]
	* i2400ms_rx_setup()
	*
	* i2400ms_bus_dev_stop() Called by i2400m_dev_stop() [who is
	* i2400ms_rx_release() is called by i2400m_release()]
	* i2400ms_tx_release()
	*
	*/

	#include <linux/debugfs.h>
	#include <linux/mmc/sdio.h>
	#include <linux/mmc/sdio_func.h>
	#include "i2400m-sdio.h"
	#include <linux/wimax/i2400m.h>

	#define D_SUBMODULE main
	#include "sdio-debug-levels.h"

	/* IOE WiMAX function timeout in seconds */
	static int ioe_timeout = 2;
	module_param(ioe_timeout, int, 0);

	/* Our firmware file name */
	#define I2400MS_FW_FILE_NAME "i2400m-fw-sdio-" I2400M_FW_VERSION ".sbcf"

	/*
	* Enable the SDIO function
	*
	* Tries to enable the SDIO function; might fail if it is still not
	* ready (in some hardware, the SDIO WiMAX function is only enabled
	* when we ask it to explicitly doing). Tries until a timeout is
	* reached.
	*
	* The reverse of this is...sdio_disable_function()
	*
	* Returns: 0 if the SDIO function was enabled, < 0 errno code on
	* error (-ENODEV when it was unable to enable the function).
	*/
	static
	int i2400ms_enable_function(struct sdio_func *func)
	{
	u64 timeout;
	int err;
	struct device *dev = &func->dev;

	d_fnstart(3, dev, "(func %p)\n", func);
	/* Setup timeout (FIXME: This needs to read the CIS table to
	* get a real timeout) and then wait for the device to signal
	* it is ready */
	timeout = get_jiffies_64() + ioe_timeout * HZ;
	err = -ENODEV;
	while (err != 0 && time_before64(get_jiffies_64(), timeout)) {
	sdio_claim_host(func);
	err = sdio_enable_func(func);
	if (0 == err) {
	sdio_release_host(func);
	d_printf(2, dev, "SDIO function enabled\n");
	goto function_enabled;
	}
	d_printf(2, dev, "SDIO function failed to enable: %d\n", err);
	sdio_disable_func(func);
	sdio_release_host(func);
	msleep(I2400MS_INIT_SLEEP_INTERVAL);
	}
	/* If timed out, device is not there yet -- get -ENODEV so
	* the device driver core will retry later on. */
	if (err == -ETIME) {
	dev_err(dev, "Can't enable WiMAX function; "
	" has the function been enabled?\n");
	err = -ENODEV;
	}
	function_enabled:
	d_fnend(3, dev, "(func %p) = %d\n", func, err);
	return err;
	}


	/*
	* Setup driver resources needed to communicate with the device
	*
	* The fw needs some time to settle, and it was just uploaded,
	* so give it a break first. I'd prefer to just wait for the device to
	* send something, but seems the poking we do to enable SDIO stuff
	* interferes with it, so just give it a break before starting...
	*/
	static
	int i2400ms_bus_dev_start(struct i2400m *i2400m)
	{
	int result;
	struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
	struct sdio_func *func = i2400ms->func;
	struct device *dev = &func->dev;

	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
	msleep(200);
	result = i2400ms_rx_setup(i2400ms);
	if (result < 0)
	goto error_rx_setup;
	result = i2400ms_tx_setup(i2400ms);
	if (result < 0)
	goto error_tx_setup;
	d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
	return result;

	i2400ms_tx_release(i2400ms);
	error_tx_setup:
	i2400ms_rx_release(i2400ms);
	error_rx_setup:
	d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
	return result;
	}


	static
	void i2400ms_bus_dev_stop(struct i2400m *i2400m)
	{
	struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
	struct sdio_func *func = i2400ms->func;
	struct device *dev = &func->dev;

	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
	i2400ms_rx_release(i2400ms);
	i2400ms_tx_release(i2400ms);
	d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
	}


	/*
	* Sends a barker buffer to the device
	*
	* This helper will allocate a kmalloced buffer and use it to transmit
	* (then free it). Reason for this is that the SDIO host controller
	* expects alignment (unknown exactly which) which the stack won't
	* really provide and certain arches/host-controller combinations
	* cannot use stack/vmalloc/text areas for DMA transfers.
	*/
	static
	int __i2400ms_send_barker(struct i2400ms *i2400ms,
	const __le32 *barker, size_t barker_size)
	{
	int ret;
	struct sdio_func *func = i2400ms->func;
	struct device *dev = &func->dev;
	void *buffer;

	ret = -ENOMEM;
	buffer = kmalloc(I2400MS_BLK_SIZE, GFP_KERNEL);
	if (buffer == NULL)
	goto error_kzalloc;

	memcpy(buffer, barker, barker_size);
	sdio_claim_host(func);
	ret = sdio_memcpy_toio(func, 0, buffer, I2400MS_BLK_SIZE);
	sdio_release_host(func);

	if (ret < 0)
	d_printf(0, dev, "E: barker error: %d\n", ret);

	kfree(buffer);
	error_kzalloc:
	return ret;
	}


	/*
	* Reset a device at different levels (warm, cold or bus)
	*
	* @i2400ms: device descriptor
	* @reset_type: soft, warm or bus reset (I2400M_RT_WARM/SOFT/BUS)
	*
	* FIXME: not tested -- need to confirm expected effects
	*
	* Warm and cold resets get an SDIO reset if they fail (unimplemented)
	*
	* Warm reset:
	*
	* The device will be fully reset internally, but won't be
	* disconnected from the USB bus (so no reenumeration will
	* happen). Firmware upload will be neccessary.
	*
	* The device will send a reboot barker in the notification endpoint
	* that will trigger the driver to reinitialize the state
	* automatically from notif.c:i2400m_notification_grok() into
	* i2400m_dev_bootstrap_delayed().
	*
	* Cold and bus (USB) reset:
	*
	* The device will be fully reset internally, disconnected from the
	* USB bus an a reenumeration will happen. Firmware upload will be
	* neccessary. Thus, we don't do any locking or struct
	* reinitialization, as we are going to be fully disconnected and
	* reenumerated.
	*
	* Note we need to return -ENODEV if a warm reset was requested and we
	* had to resort to a bus reset. See i2400m_op_reset(), wimax_reset()
	* and wimax_dev->op_reset.
	*
	* WARNING: no driver state saved/fixed
	*/
	static
	int i2400ms_bus_reset(struct i2400m *i2400m, enum i2400m_reset_type rt)
	{
	int result;
	struct i2400ms *i2400ms =
	container_of(i2400m, struct i2400ms, i2400m);
	struct device *dev = i2400m_dev(i2400m);
	static const __le32 i2400m_WARM_BOOT_BARKER[4] = {
	cpu_to_le32(I2400M_WARM_RESET_BARKER),
	cpu_to_le32(I2400M_WARM_RESET_BARKER),
	cpu_to_le32(I2400M_WARM_RESET_BARKER),
	cpu_to_le32(I2400M_WARM_RESET_BARKER),
	};
	static const __le32 i2400m_COLD_BOOT_BARKER[4] = {
	cpu_to_le32(I2400M_COLD_RESET_BARKER),
	cpu_to_le32(I2400M_COLD_RESET_BARKER),
	cpu_to_le32(I2400M_COLD_RESET_BARKER),
	cpu_to_le32(I2400M_COLD_RESET_BARKER),
	};

	if (rt == I2400M_RT_WARM)
	result = __i2400ms_send_barker(i2400ms, i2400m_WARM_BOOT_BARKER,
	sizeof(i2400m_WARM_BOOT_BARKER));
	else if (rt == I2400M_RT_COLD)
	result = __i2400ms_send_barker(i2400ms, i2400m_COLD_BOOT_BARKER,
	sizeof(i2400m_COLD_BOOT_BARKER));
	else if (rt == I2400M_RT_BUS) {
	do_bus_reset:
	dev_err(dev, "FIXME: SDIO bus reset not implemented\n");
	result = rt == I2400M_RT_WARM ? -ENODEV : -ENOSYS;
	} else
	BUG();
	if (result < 0 && rt != I2400M_RT_BUS) {
	dev_err(dev, "%s reset failed (%d); trying SDIO reset\n",
	rt == I2400M_RT_WARM ? "warm" : "cold", result);
	rt = I2400M_RT_BUS;
	goto do_bus_reset;
	}
	return result;
	}


	static
	void i2400ms_netdev_setup(struct net_device *net_dev)
	{
	struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
	struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
	i2400ms_init(i2400ms);
	i2400m_netdev_setup(net_dev);
	}


	/*
	* Debug levels control; see debug.h
	*/
	struct d_level D_LEVEL[] = {
	D_SUBMODULE_DEFINE(main),
	D_SUBMODULE_DEFINE(tx),
	D_SUBMODULE_DEFINE(rx),
	D_SUBMODULE_DEFINE(fw),
	};
	size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);


	#define __debugfs_register(prefix, name, parent) \
	do { \
	result = d_level_register_debugfs(prefix, name, parent); \
	if (result < 0) \
	goto error; \
	} while (0)


	static
	int i2400ms_debugfs_add(struct i2400ms *i2400ms)
	{
	int result;
	struct dentry *dentry = i2400ms->i2400m.wimax_dev.debugfs_dentry;

	dentry = debugfs_create_dir("i2400m-usb", dentry);
	result = PTR_ERR(dentry);
	if (IS_ERR(dentry)) {
	if (result == -ENODEV)
	result = 0; /* No debugfs support */
	goto error;
	}
	i2400ms->debugfs_dentry = dentry;
	__debugfs_register("dl_", main, dentry);
	__debugfs_register("dl_", tx, dentry);
	__debugfs_register("dl_", rx, dentry);
	__debugfs_register("dl_", fw, dentry);

	return 0;

	error:
	debugfs_remove_recursive(i2400ms->debugfs_dentry);
	return result;
	}


	/*
	* Probe a i2400m interface and register it
	*
	* @func: SDIO function
	* @id: SDIO device ID
	* @returns: 0 if ok, < 0 errno code on error.
	*
	* Alloc a net device, initialize the bus-specific details and then
	* calls the bus-generic initialization routine. That will register
	* the wimax and netdev devices, upload the firmware [using
	* _bus_bm_*()], call _bus_dev_start() to finalize the setup of the
	* communication with the device and then will start to talk to it to
	* finnish setting it up.
	*
	* Initialization is tricky; some instances of the hw are packed with
	* others in a way that requires a third driver that enables the WiMAX
	* function. In those cases, we can't enable the SDIO function and
	* we'll return with -ENODEV. When the driver that enables the WiMAX
	* function does its thing, it has to do a bus_rescan_devices() on the
	* SDIO bus so this driver is called again to enumerate the WiMAX
	* function.
	*/
	static
	int i2400ms_probe(struct sdio_func *func,
	const struct sdio_device_id *id)
	{
	int result;
	struct net_device *net_dev;
	struct device *dev = &func->dev;
	struct i2400m *i2400m;
	struct i2400ms *i2400ms;

	/* Allocate instance [calls i2400m_netdev_setup() on it]. */
	result = -ENOMEM;
	net_dev = alloc_netdev(sizeof(*i2400ms), "wmx%d",
	i2400ms_netdev_setup);
	if (net_dev == NULL) {
	dev_err(dev, "no memory for network device instance\n");
	goto error_alloc_netdev;
	}
	SET_NETDEV_DEV(net_dev, dev);
	i2400m = net_dev_to_i2400m(net_dev);
	i2400ms = container_of(i2400m, struct i2400ms, i2400m);
	i2400m->wimax_dev.net_dev = net_dev;
	i2400ms->func = func;
	sdio_set_drvdata(func, i2400ms);

	i2400m->bus_tx_block_size = I2400MS_BLK_SIZE;
	i2400m->bus_pl_size_max = I2400MS_PL_SIZE_MAX;
	i2400m->bus_dev_start = i2400ms_bus_dev_start;
	i2400m->bus_dev_stop = i2400ms_bus_dev_stop;
	i2400m->bus_tx_kick = i2400ms_bus_tx_kick;
	i2400m->bus_reset = i2400ms_bus_reset;
	i2400m->bus_bm_cmd_send = i2400ms_bus_bm_cmd_send;
	i2400m->bus_bm_wait_for_ack = i2400ms_bus_bm_wait_for_ack;
	i2400m->bus_fw_name = I2400MS_FW_FILE_NAME;
	i2400m->bus_bm_mac_addr_impaired = 1;

	result = i2400ms_enable_function(i2400ms->func);
	if (result < 0) {
	dev_err(dev, "Cannot enable SDIO function: %d\n", result);
	goto error_func_enable;
	}

	sdio_claim_host(func);
	result = sdio_set_block_size(func, I2400MS_BLK_SIZE);
	if (result < 0) {
	dev_err(dev, "Failed to set block size: %d\n", result);
	goto error_set_blk_size;
	}
	sdio_release_host(func);

	result = i2400m_setup(i2400m, I2400M_BRI_NO_REBOOT);
	if (result < 0) {
	dev_err(dev, "cannot setup device: %d\n", result);
	goto error_setup;
	}

	result = i2400ms_debugfs_add(i2400ms);
	if (result < 0) {
	dev_err(dev, "cannot create SDIO debugfs: %d\n",
	result);
	goto error_debugfs_add;
	}
	return 0;

	error_debugfs_add:
	i2400m_release(i2400m);
	error_setup:
	sdio_set_drvdata(func, NULL);
	sdio_claim_host(func);
	error_set_blk_size:
	sdio_disable_func(func);
	sdio_release_host(func);
	error_func_enable:
	free_netdev(net_dev);
	error_alloc_netdev:
	return result;
	}


	static
	void i2400ms_remove(struct sdio_func *func)
	{
	struct device *dev = &func->dev;
	struct i2400ms *i2400ms = sdio_get_drvdata(func);
	struct i2400m *i2400m = &i2400ms->i2400m;
	struct net_device *net_dev = i2400m->wimax_dev.net_dev;

	d_fnstart(3, dev, "SDIO func %p\n", func);
	debugfs_remove_recursive(i2400ms->debugfs_dentry);
	i2400m_release(i2400m);
	sdio_set_drvdata(func, NULL);
	sdio_claim_host(func);
	sdio_disable_func(func);
	sdio_release_host(func);
	free_netdev(net_dev);
	d_fnend(3, dev, "SDIO func %p\n", func);
	}

	enum {
	I2400MS_INTEL_VID = 0x89,
	};

	static
	const struct sdio_device_id i2400ms_sdio_ids[] = {
	/* Intel: i2400m WiMAX over SDIO */
	{ SDIO_DEVICE(I2400MS_INTEL_VID, 0x1402) },
	{ }, /* end: all zeroes */
	};
	MODULE_DEVICE_TABLE(sdio, i2400ms_sdio_ids);


	static
	struct sdio_driver i2400m_sdio_driver = {
	.name = KBUILD_MODNAME,
	.probe = i2400ms_probe,
	.remove = i2400ms_remove,
	.id_table = i2400ms_sdio_ids,
	};


	static
	int __init i2400ms_driver_init(void)
	{
	return sdio_register_driver(&i2400m_sdio_driver);
	}
	module_init(i2400ms_driver_init);


	static
	void __exit i2400ms_driver_exit(void)
	{
	flush_scheduled_work(); /* for the stuff we schedule */
	sdio_unregister_driver(&i2400m_sdio_driver);
	}
	module_exit(i2400ms_driver_exit);


	MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>");
	MODULE_DESCRIPTION("Intel 2400M WiMAX networking for SDIO");
	MODULE_LICENSE("GPL");
	MODULE_FIRMWARE(I2400MS_FW_FILE_NAME);