drivers/net/wireless/rt2x00/rt2x00pci.c - kernel/msm - Gitiles

 /*
 	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
 	<http://rt2x00.serialmonkey.com>

 	This program is free software; you can redistribute it and/or modify
 	it under the terms of the GNU General Public License as published by
 	the Free Software Foundation; either version 2 of the License, or
 	(at your option) any later version.

 	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.,
 	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */

 /*
 	Module: rt2x00pci
 	Abstract: rt2x00 generic pci device routines.
  */

 #include <linux/dma-mapping.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>

 #include "rt2x00.h"
 #include "rt2x00pci.h"

 /*
  * TX data handlers.
  */
 int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
 			    struct data_queue *queue, struct sk_buff *skb,
 			    struct ieee80211_tx_control *control)
 {
 	struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
 	struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
 	struct skb_frame_desc *skbdesc;
 	u32 word;

 	if (rt2x00queue_full(queue))
 		return -EINVAL;

 	rt2x00_desc_read(priv_tx->desc, 0, &word);

 	if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
 	    rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
 		ERROR(rt2x00dev,
 		      "Arrived at non-free entry in the non-full queue %d.\n"
 		      "Please file bug report to %s.\n",
 		      control->queue, DRV_PROJECT);
 		return -EINVAL;
 	}

 	/*
 	 * Fill in skb descriptor
 	 */
 	skbdesc = get_skb_frame_desc(skb);
 	memset(skbdesc, 0, sizeof(*skbdesc));
 	skbdesc->data = skb->data;
 	skbdesc->data_len = queue->data_size;
 	skbdesc->desc = priv_tx->desc;
 	skbdesc->desc_len = queue->desc_size;
 	skbdesc->entry = entry;

 	memcpy(priv_tx->data, skb->data, skb->len);
 	rt2x00lib_write_tx_desc(rt2x00dev, skb, control);

 	rt2x00queue_index_inc(queue, Q_INDEX);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);

 /*
  * TX/RX data handlers.
  */
 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 {
 	struct data_queue *queue = rt2x00dev->rx;
 	struct queue_entry *entry;
 	struct queue_entry_priv_pci_rx *priv_rx;
 	struct ieee80211_hdr *hdr;
 	struct skb_frame_desc *skbdesc;
 	struct rxdone_entry_desc rxdesc;
 	int header_size;
 	int align;
 	u32 word;

 	while (1) {
 		entry = rt2x00queue_get_entry(queue, Q_INDEX);
 		priv_rx = entry->priv_data;
 		rt2x00_desc_read(priv_rx->desc, 0, &word);

 		if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
 			break;

 		memset(&rxdesc, 0, sizeof(rxdesc));
 		rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);

 		hdr = (struct ieee80211_hdr *)priv_rx->data;
 		header_size =
 		    ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));

 		/*
 		 * The data behind the ieee80211 header must be
 		 * aligned on a 4 byte boundary.
 		 */
 		align = header_size % 4;

 		/*
 		 * Allocate the sk_buffer, initialize it and copy
 		 * all data into it.
 		 */
 		entry->skb = dev_alloc_skb(rxdesc.size + align);
 		if (!entry->skb)
 			return;

 		skb_reserve(entry->skb, align);
 		memcpy(skb_put(entry->skb, rxdesc.size),
 		       priv_rx->data, rxdesc.size);

 		/*
 		 * Fill in skb descriptor
 		 */
 		skbdesc = get_skb_frame_desc(entry->skb);
 		memset(skbdesc, 0, sizeof(*skbdesc));
 		skbdesc->data = entry->skb->data;
 		skbdesc->data_len = queue->data_size;
 		skbdesc->desc = priv_rx->desc;
 		skbdesc->desc_len = queue->desc_size;
 		skbdesc->entry = entry;

 		/*
 		 * Send the frame to rt2x00lib for further processing.
 		 */
 		rt2x00lib_rxdone(entry, &rxdesc);

 		if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) {
 			rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 			rt2x00_desc_write(priv_rx->desc, 0, word);
 		}

 		rt2x00queue_index_inc(queue, Q_INDEX);
 	}
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);

 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
 		      struct txdone_entry_desc *txdesc)
 {
 	struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
 	u32 word;

 	txdesc->control = &priv_tx->control;
 	rt2x00lib_txdone(entry, txdesc);

 	/*
 	 * Make this entry available for reuse.
 	 */
 	entry->flags = 0;

 	rt2x00_desc_read(priv_tx->desc, 0, &word);
 	rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 	rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 	rt2x00_desc_write(priv_tx->desc, 0, word);

 	rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);

 	/*
 	 * If the data queue was full before the txdone handler
 	 * we must make sure the packet queue in the mac80211 stack
 	 * is reenabled when the txdone handler has finished.
 	 */
 	if (!rt2x00queue_full(entry->queue))
 		ieee80211_wake_queue(rt2x00dev->hw, priv_tx->control.queue);

 }
 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);

 /*
  * Device initialization handlers.
  */
 #define desc_size(__queue)			\
 ({						\
 	 ((__queue)->limit * (__queue)->desc_size);\
 })

 #define data_size(__queue)			\
 ({						\
 	 ((__queue)->limit * (__queue)->data_size);\
 })

 #define dma_size(__queue)			\
 ({						\
 	data_size(__queue) + desc_size(__queue);\
 })

 #define desc_offset(__queue, __base, __i)	\
 ({						\
 	(__base) + data_size(__queue) + 	\
 	    ((__i) * (__queue)->desc_size);	\
 })

 #define data_offset(__queue, __base, __i)	\
 ({						\
 	(__base) +				\
 	    ((__i) * (__queue)->data_size);	\
 })

 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 				     struct data_queue *queue)
 {
 	struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 	struct queue_entry_priv_pci_rx *priv_rx;
 	struct queue_entry_priv_pci_tx *priv_tx;
 	void *desc;
 	void *data_addr;
 	void *data;
 	dma_addr_t data_dma;
 	dma_addr_t dma;
 	unsigned int i;

 	/*
 	 * Allocate DMA memory for descriptor and buffer.
 	 */
 	data_addr = pci_alloc_consistent(pci_dev, dma_size(queue), &data_dma);
 	if (!data_addr)
 		return -ENOMEM;

 	memset(data_addr, 0, dma_size(queue));

 	/*
 	 * Initialize all queue entries to contain valid addresses.
 	 */
 	for (i = 0; i < queue->limit; i++) {
 		desc = desc_offset(queue, data_addr, i);
 		data = data_offset(queue, data_addr, i);
 		dma = data_offset(queue, data_dma, i);

 		if (queue->qid == QID_RX) {
 			priv_rx = queue->entries[i].priv_data;
 			priv_rx->desc = desc;
 			priv_rx->data = data;
 			priv_rx->dma = dma;
 		} else {
 			priv_tx = queue->entries[i].priv_data;
 			priv_tx->desc = desc;
 			priv_tx->data = data;
 			priv_tx->dma = dma;
 		}
 	}

 	return 0;
 }

 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 				     struct data_queue *queue)
 {
 	struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 	struct queue_entry_priv_pci_rx *priv_rx;
 	struct queue_entry_priv_pci_tx *priv_tx;
 	void *data_addr;
 	dma_addr_t data_dma;

 	if (queue->qid == QID_RX) {
 		priv_rx = queue->entries[0].priv_data;
 		data_addr = priv_rx->data;
 		data_dma = priv_rx->dma;

 		priv_rx->data = NULL;
 	} else {
 		priv_tx = queue->entries[0].priv_data;
 		data_addr = priv_tx->data;
 		data_dma = priv_tx->dma;

 		priv_tx->data = NULL;
 	}

 	if (data_addr)
 		pci_free_consistent(pci_dev, dma_size(queue),
 				    data_addr, data_dma);
 }

 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 {
 	struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 	struct data_queue *queue;
 	int status;

 	/*
 	 * Allocate DMA
 	 */
 	queue_for_each(rt2x00dev, queue) {
 		status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 		if (status)
 			goto exit;
 	}

 	/*
 	 * Register interrupt handler.
 	 */
 	status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 			     IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 	if (status) {
 		ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 		      pci_dev->irq, status);
 		return status;
 	}

 	return 0;

 exit:
 	rt2x00pci_uninitialize(rt2x00dev);

 	return status;
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);

 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 {
 	struct data_queue *queue;

 	/*
 	 * Free irq line.
 	 */
 	free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);

 	/*
 	 * Free DMA
 	 */
 	queue_for_each(rt2x00dev, queue)
 		rt2x00pci_free_queue_dma(rt2x00dev, queue);
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);

 /*
  * PCI driver handlers.
  */
 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 {
 	kfree(rt2x00dev->rf);
 	rt2x00dev->rf = NULL;

 	kfree(rt2x00dev->eeprom);
 	rt2x00dev->eeprom = NULL;

 	if (rt2x00dev->csr_addr) {
 		iounmap(rt2x00dev->csr_addr);
 		rt2x00dev->csr_addr = NULL;
 	}
 }

 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 {
 	struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);

 	rt2x00dev->csr_addr = ioremap(pci_resource_start(pci_dev, 0),
 				      pci_resource_len(pci_dev, 0));
 	if (!rt2x00dev->csr_addr)
 		goto exit;

 	rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 	if (!rt2x00dev->eeprom)
 		goto exit;

 	rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 	if (!rt2x00dev->rf)
 		goto exit;

 	return 0;

 exit:
 	ERROR_PROBE("Failed to allocate registers.\n");

 	rt2x00pci_free_reg(rt2x00dev);

 	return -ENOMEM;
 }

 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 {
 	struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 	struct ieee80211_hw *hw;
 	struct rt2x00_dev *rt2x00dev;
 	int retval;

 	retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 	if (retval) {
 		ERROR_PROBE("PCI request regions failed.\n");
 		return retval;
 	}

 	retval = pci_enable_device(pci_dev);
 	if (retval) {
 		ERROR_PROBE("Enable device failed.\n");
 		goto exit_release_regions;
 	}

 	pci_set_master(pci_dev);

 	if (pci_set_mwi(pci_dev))
 		ERROR_PROBE("MWI not available.\n");

 	if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 	    pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 		ERROR_PROBE("PCI DMA not supported.\n");
 		retval = -EIO;
 		goto exit_disable_device;
 	}

 	hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 	if (!hw) {
 		ERROR_PROBE("Failed to allocate hardware.\n");
 		retval = -ENOMEM;
 		goto exit_disable_device;
 	}

 	pci_set_drvdata(pci_dev, hw);

 	rt2x00dev = hw->priv;
 	rt2x00dev->dev = pci_dev;
 	rt2x00dev->ops = ops;
 	rt2x00dev->hw = hw;

 	retval = rt2x00pci_alloc_reg(rt2x00dev);
 	if (retval)
 		goto exit_free_device;

 	retval = rt2x00lib_probe_dev(rt2x00dev);
 	if (retval)
 		goto exit_free_reg;

 	return 0;

 exit_free_reg:
 	rt2x00pci_free_reg(rt2x00dev);

 exit_free_device:
 	ieee80211_free_hw(hw);

 exit_disable_device:
 	if (retval != -EBUSY)
 		pci_disable_device(pci_dev);

 exit_release_regions:
 	pci_release_regions(pci_dev);

 	pci_set_drvdata(pci_dev, NULL);

 	return retval;
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_probe);

 void rt2x00pci_remove(struct pci_dev *pci_dev)
 {
 	struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 	struct rt2x00_dev *rt2x00dev = hw->priv;

 	/*
 	 * Free all allocated data.
 	 */
 	rt2x00lib_remove_dev(rt2x00dev);
 	rt2x00pci_free_reg(rt2x00dev);
 	ieee80211_free_hw(hw);

 	/*
 	 * Free the PCI device data.
 	 */
 	pci_set_drvdata(pci_dev, NULL);
 	pci_disable_device(pci_dev);
 	pci_release_regions(pci_dev);
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_remove);

 #ifdef CONFIG_PM
 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 {
 	struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	int retval;

 	retval = rt2x00lib_suspend(rt2x00dev, state);
 	if (retval)
 		return retval;

 	rt2x00pci_free_reg(rt2x00dev);

 	pci_save_state(pci_dev);
 	pci_disable_device(pci_dev);
 	return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);

 int rt2x00pci_resume(struct pci_dev *pci_dev)
 {
 	struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	int retval;

 	if (pci_set_power_state(pci_dev, PCI_D0) ||
 	    pci_enable_device(pci_dev) ||
 	    pci_restore_state(pci_dev)) {
 		ERROR(rt2x00dev, "Failed to resume device.\n");
 		return -EIO;
 	}

 	retval = rt2x00pci_alloc_reg(rt2x00dev);
 	if (retval)
 		return retval;

 	retval = rt2x00lib_resume(rt2x00dev);
 	if (retval)
 		goto exit_free_reg;

 	return 0;

 exit_free_reg:
 	rt2x00pci_free_reg(rt2x00dev);

 	return retval;
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 #endif /* CONFIG_PM */

 /*
  * rt2x00pci module information.
  */
 MODULE_AUTHOR(DRV_PROJECT);
 MODULE_VERSION(DRV_VERSION);
 MODULE_DESCRIPTION("rt2x00 pci library");
 MODULE_LICENSE("GPL");
	/*
	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
	<http://rt2x00.serialmonkey.com>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	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.,
	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*/

	/*
	Module: rt2x00pci
	Abstract: rt2x00 generic pci device routines.
	*/

	#include <linux/dma-mapping.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/pci.h>

	#include "rt2x00.h"
	#include "rt2x00pci.h"

	/*
	* TX data handlers.
	*/
	int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
	struct data_queue queue, struct sk_buff skb,
	struct ieee80211_tx_control *control)
	{
	struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
	struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
	struct skb_frame_desc *skbdesc;
	u32 word;

	if (rt2x00queue_full(queue))
	return -EINVAL;

	rt2x00_desc_read(priv_tx->desc, 0, &word);

	if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) \|\|
	rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
	ERROR(rt2x00dev,
	"Arrived at non-free entry in the non-full queue %d.\n"
	"Please file bug report to %s.\n",
	control->queue, DRV_PROJECT);
	return -EINVAL;
	}

	/*
	* Fill in skb descriptor
	*/
	skbdesc = get_skb_frame_desc(skb);
	memset(skbdesc, 0, sizeof(*skbdesc));
	skbdesc->data = skb->data;
	skbdesc->data_len = queue->data_size;
	skbdesc->desc = priv_tx->desc;
	skbdesc->desc_len = queue->desc_size;
	skbdesc->entry = entry;

	memcpy(priv_tx->data, skb->data, skb->len);
	rt2x00lib_write_tx_desc(rt2x00dev, skb, control);

	rt2x00queue_index_inc(queue, Q_INDEX);

	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);

	/*
	* TX/RX data handlers.
	*/
	void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
	{
	struct data_queue *queue = rt2x00dev->rx;
	struct queue_entry *entry;
	struct queue_entry_priv_pci_rx *priv_rx;
	struct ieee80211_hdr *hdr;
	struct skb_frame_desc *skbdesc;
	struct rxdone_entry_desc rxdesc;
	int header_size;
	int align;
	u32 word;

	while (1) {
	entry = rt2x00queue_get_entry(queue, Q_INDEX);
	priv_rx = entry->priv_data;
	rt2x00_desc_read(priv_rx->desc, 0, &word);

	if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
	break;

	memset(&rxdesc, 0, sizeof(rxdesc));
	rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);

	hdr = (struct ieee80211_hdr *)priv_rx->data;
	header_size =
	ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));

	/*
	* The data behind the ieee80211 header must be
	* aligned on a 4 byte boundary.
	*/
	align = header_size % 4;

	/*
	* Allocate the sk_buffer, initialize it and copy
	* all data into it.
	*/
	entry->skb = dev_alloc_skb(rxdesc.size + align);
	if (!entry->skb)
	return;

	skb_reserve(entry->skb, align);
	memcpy(skb_put(entry->skb, rxdesc.size),
	priv_rx->data, rxdesc.size);

	/*
	* Fill in skb descriptor
	*/
	skbdesc = get_skb_frame_desc(entry->skb);
	memset(skbdesc, 0, sizeof(*skbdesc));
	skbdesc->data = entry->skb->data;
	skbdesc->data_len = queue->data_size;
	skbdesc->desc = priv_rx->desc;
	skbdesc->desc_len = queue->desc_size;
	skbdesc->entry = entry;

	/*
	* Send the frame to rt2x00lib for further processing.
	*/
	rt2x00lib_rxdone(entry, &rxdesc);

	if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) {
	rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
	rt2x00_desc_write(priv_rx->desc, 0, word);
	}

	rt2x00queue_index_inc(queue, Q_INDEX);
	}
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);

	void rt2x00pci_txdone(struct rt2x00_dev rt2x00dev, struct queue_entry entry,
	struct txdone_entry_desc *txdesc)
	{
	struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
	u32 word;

	txdesc->control = &priv_tx->control;
	rt2x00lib_txdone(entry, txdesc);

	/*
	* Make this entry available for reuse.
	*/
	entry->flags = 0;

	rt2x00_desc_read(priv_tx->desc, 0, &word);
	rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
	rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
	rt2x00_desc_write(priv_tx->desc, 0, word);

	rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);

	/*
	* If the data queue was full before the txdone handler
	* we must make sure the packet queue in the mac80211 stack
	* is reenabled when the txdone handler has finished.
	*/
	if (!rt2x00queue_full(entry->queue))
	ieee80211_wake_queue(rt2x00dev->hw, priv_tx->control.queue);

	}
	EXPORT_SYMBOL_GPL(rt2x00pci_txdone);

	/*
	* Device initialization handlers.
	*/
	#define desc_size(__queue) \
	({ \
	((__queue)->limit * (__queue)->desc_size);\
	})

	#define data_size(__queue) \
	({ \
	((__queue)->limit * (__queue)->data_size);\
	})

	#define dma_size(__queue) \
	({ \
	data_size(__queue) + desc_size(__queue);\
	})

	#define desc_offset(__queue, __base, __i) \
	({ \
	(__base) + data_size(__queue) + \
	((__i) * (__queue)->desc_size); \
	})

	#define data_offset(__queue, __base, __i) \
	({ \
	(__base) + \
	((__i) * (__queue)->data_size); \
	})

	static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
	struct data_queue *queue)
	{
	struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
	struct queue_entry_priv_pci_rx *priv_rx;
	struct queue_entry_priv_pci_tx *priv_tx;
	void *desc;
	void *data_addr;
	void *data;
	dma_addr_t data_dma;
	dma_addr_t dma;
	unsigned int i;

	/*
	* Allocate DMA memory for descriptor and buffer.
	*/
	data_addr = pci_alloc_consistent(pci_dev, dma_size(queue), &data_dma);
	if (!data_addr)
	return -ENOMEM;

	memset(data_addr, 0, dma_size(queue));

	/*
	* Initialize all queue entries to contain valid addresses.
	*/
	for (i = 0; i < queue->limit; i++) {
	desc = desc_offset(queue, data_addr, i);
	data = data_offset(queue, data_addr, i);
	dma = data_offset(queue, data_dma, i);

	if (queue->qid == QID_RX) {
	priv_rx = queue->entries[i].priv_data;
	priv_rx->desc = desc;
	priv_rx->data = data;
	priv_rx->dma = dma;
	} else {
	priv_tx = queue->entries[i].priv_data;
	priv_tx->desc = desc;
	priv_tx->data = data;
	priv_tx->dma = dma;
	}
	}

	return 0;
	}

	static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
	struct data_queue *queue)
	{
	struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
	struct queue_entry_priv_pci_rx *priv_rx;
	struct queue_entry_priv_pci_tx *priv_tx;
	void *data_addr;
	dma_addr_t data_dma;

	if (queue->qid == QID_RX) {
	priv_rx = queue->entries[0].priv_data;
	data_addr = priv_rx->data;
	data_dma = priv_rx->dma;

	priv_rx->data = NULL;
	} else {
	priv_tx = queue->entries[0].priv_data;
	data_addr = priv_tx->data;
	data_dma = priv_tx->dma;

	priv_tx->data = NULL;
	}

	if (data_addr)
	pci_free_consistent(pci_dev, dma_size(queue),
	data_addr, data_dma);
	}

	int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
	{
	struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
	struct data_queue *queue;
	int status;

	/*
	* Allocate DMA
	*/
	queue_for_each(rt2x00dev, queue) {
	status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
	if (status)
	goto exit;
	}

	/*
	* Register interrupt handler.
	*/
	status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
	IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
	if (status) {
	ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
	pci_dev->irq, status);
	return status;
	}

	return 0;

	exit:
	rt2x00pci_uninitialize(rt2x00dev);

	return status;
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_initialize);

	void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
	{
	struct data_queue *queue;

	/*
	* Free irq line.
	*/
	free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);

	/*
	* Free DMA
	*/
	queue_for_each(rt2x00dev, queue)
	rt2x00pci_free_queue_dma(rt2x00dev, queue);
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);

	/*
	* PCI driver handlers.
	*/
	static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
	{
	kfree(rt2x00dev->rf);
	rt2x00dev->rf = NULL;

	kfree(rt2x00dev->eeprom);
	rt2x00dev->eeprom = NULL;

	if (rt2x00dev->csr_addr) {
	iounmap(rt2x00dev->csr_addr);
	rt2x00dev->csr_addr = NULL;
	}
	}

	static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
	{
	struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);

	rt2x00dev->csr_addr = ioremap(pci_resource_start(pci_dev, 0),
	pci_resource_len(pci_dev, 0));
	if (!rt2x00dev->csr_addr)
	goto exit;

	rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
	if (!rt2x00dev->eeprom)
	goto exit;

	rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
	if (!rt2x00dev->rf)
	goto exit;

	return 0;

	exit:
	ERROR_PROBE("Failed to allocate registers.\n");

	rt2x00pci_free_reg(rt2x00dev);

	return -ENOMEM;
	}

	int rt2x00pci_probe(struct pci_dev pci_dev, const struct pci_device_id id)
	{
	struct rt2x00_ops ops = (struct rt2x00_ops )id->driver_data;
	struct ieee80211_hw *hw;
	struct rt2x00_dev *rt2x00dev;
	int retval;

	retval = pci_request_regions(pci_dev, pci_name(pci_dev));
	if (retval) {
	ERROR_PROBE("PCI request regions failed.\n");
	return retval;
	}

	retval = pci_enable_device(pci_dev);
	if (retval) {
	ERROR_PROBE("Enable device failed.\n");
	goto exit_release_regions;
	}

	pci_set_master(pci_dev);

	if (pci_set_mwi(pci_dev))
	ERROR_PROBE("MWI not available.\n");

	if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
	pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
	ERROR_PROBE("PCI DMA not supported.\n");
	retval = -EIO;
	goto exit_disable_device;
	}

	hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
	if (!hw) {
	ERROR_PROBE("Failed to allocate hardware.\n");
	retval = -ENOMEM;
	goto exit_disable_device;
	}

	pci_set_drvdata(pci_dev, hw);

	rt2x00dev = hw->priv;
	rt2x00dev->dev = pci_dev;
	rt2x00dev->ops = ops;
	rt2x00dev->hw = hw;

	retval = rt2x00pci_alloc_reg(rt2x00dev);
	if (retval)
	goto exit_free_device;

	retval = rt2x00lib_probe_dev(rt2x00dev);
	if (retval)
	goto exit_free_reg;

	return 0;

	exit_free_reg:
	rt2x00pci_free_reg(rt2x00dev);

	exit_free_device:
	ieee80211_free_hw(hw);

	exit_disable_device:
	if (retval != -EBUSY)
	pci_disable_device(pci_dev);

	exit_release_regions:
	pci_release_regions(pci_dev);

	pci_set_drvdata(pci_dev, NULL);

	return retval;
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_probe);

	void rt2x00pci_remove(struct pci_dev *pci_dev)
	{
	struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
	struct rt2x00_dev *rt2x00dev = hw->priv;

	/*
	* Free all allocated data.
	*/
	rt2x00lib_remove_dev(rt2x00dev);
	rt2x00pci_free_reg(rt2x00dev);
	ieee80211_free_hw(hw);

	/*
	* Free the PCI device data.
	*/
	pci_set_drvdata(pci_dev, NULL);
	pci_disable_device(pci_dev);
	pci_release_regions(pci_dev);
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_remove);

	#ifdef CONFIG_PM
	int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
	{
	struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
	struct rt2x00_dev *rt2x00dev = hw->priv;
	int retval;

	retval = rt2x00lib_suspend(rt2x00dev, state);
	if (retval)
	return retval;

	rt2x00pci_free_reg(rt2x00dev);

	pci_save_state(pci_dev);
	pci_disable_device(pci_dev);
	return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_suspend);

	int rt2x00pci_resume(struct pci_dev *pci_dev)
	{
	struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
	struct rt2x00_dev *rt2x00dev = hw->priv;
	int retval;

	if (pci_set_power_state(pci_dev, PCI_D0) \|\|
	pci_enable_device(pci_dev) \|\|
	pci_restore_state(pci_dev)) {
	ERROR(rt2x00dev, "Failed to resume device.\n");
	return -EIO;
	}

	retval = rt2x00pci_alloc_reg(rt2x00dev);
	if (retval)
	return retval;

	retval = rt2x00lib_resume(rt2x00dev);
	if (retval)
	goto exit_free_reg;

	return 0;

	exit_free_reg:
	rt2x00pci_free_reg(rt2x00dev);

	return retval;
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_resume);
	#endif /* CONFIG_PM */

	/*
	* rt2x00pci module information.
	*/
	MODULE_AUTHOR(DRV_PROJECT);
	MODULE_VERSION(DRV_VERSION);
	MODULE_DESCRIPTION("rt2x00 pci library");
	MODULE_LICENSE("GPL");