iwlwifi.h

linux内核源码

/******************************************************************************
 *
 * Copyright(c) 2003 - 2007 Intel Corporation. All rights reserved.
 *
 * Portions of this file are derived from the ipw3945 project, as well
 * as portions of the ieee80211 subsystem header files.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License 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, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 * James P. Ketrenos <[e-mail]>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/

#ifndef __iwlwifi_h__
#define __iwlwifi_h__

#include <linux/pci.h> /* for struct pci_device_id */
#include <linux/kernel.h>
#include <net/ieee80211_radiotap.h>

struct iwl_priv;

/* Hardware specific file defines the PCI IDs table for that hardware module */
extern struct pci_device_id iwl_hw_card_ids[];

#include "iwl-hw.h"
#if IWL == 3945
#define DRV_NAME	"iwl3945"
#include "iwl-3945-hw.h"
#elif IWL == 4965
#define DRV_NAME        "iwl4965"
#include "iwl-4965-hw.h"
#endif

#include "iwl-prph.h"

/*
 * Driver implementation data structures, constants, inline
 * functions
 *
 * NOTE:  DO NOT PUT HARDWARE/UCODE SPECIFIC DECLRATIONS HERE
 *
 * Hardware specific declrations go into iwl-*hw.h
 *
 */

#include "iwl-debug.h"

/* Default noise level to report when noise measurement is not available.
 *   This may be because we're:
 *   1)  Not associated (4965, no beacon statistics being sent to driver)
 *   2)  Scanning (noise measurement does not apply to associated channel)
 *   3)  Receiving CCK (3945 delivers noise info only for OFDM frames)
 * Use default noise value of -127 ... this is below the range of measurable
 *   Rx dBm for either 3945 or 4965, so it can indicate "unmeasurable" to user.
 *   Also, -127 works better than 0 when averaging frames with/without
 *   noise info (e.g. averaging might be done in app); measured dBm values are
 *   always negative ... using a negative value as the default keeps all
 *   averages within an s8's (used in some apps) range of negative values. */
#define IWL_NOISE_MEAS_NOT_AVAILABLE (-127)

/* Module parameters accessible from iwl-*.c */
extern int iwl_param_disable_hw_scan;
extern int iwl_param_debug;
extern int iwl_param_mode;
extern int iwl_param_disable;
extern int iwl_param_antenna;
extern int iwl_param_hwcrypto;
extern int iwl_param_qos_enable;
extern int iwl_param_queues_num;

enum iwl_antenna {
	IWL_ANTENNA_DIVERSITY,
	IWL_ANTENNA_MAIN,
	IWL_ANTENNA_AUX
};

/*
 * RTS threshold here is total size [2347] minus 4 FCS bytes
 * Per spec:
 *   a value of 0 means RTS on all data/management packets
 *   a value > max MSDU size means no RTS
 * else RTS for data/management frames where MPDU is larger
 *   than RTS value.
 */
#define DEFAULT_RTS_THRESHOLD     2347U
#define MIN_RTS_THRESHOLD         0U
#define MAX_RTS_THRESHOLD         2347U
#define MAX_MSDU_SIZE		  2304U
#define MAX_MPDU_SIZE		  2346U
#define DEFAULT_BEACON_INTERVAL   100U
#define	DEFAULT_SHORT_RETRY_LIMIT 7U
#define	DEFAULT_LONG_RETRY_LIMIT  4U

struct iwl_rx_mem_buffer {
	dma_addr_t dma_addr;
	struct sk_buff *skb;
	struct list_head list;
};

struct iwl_rt_rx_hdr {
	struct ieee80211_radiotap_header rt_hdr;
	__le64 rt_tsf;		/* TSF */
	u8 rt_flags;		/* radiotap packet flags */
	u8 rt_rate;		/* rate in 500kb/s */
	__le16 rt_channelMHz;	/* channel in MHz */
	__le16 rt_chbitmask;	/* channel bitfield */
	s8 rt_dbmsignal;	/* signal in dBm, kluged to signed */
	s8 rt_dbmnoise;
	u8 rt_antenna;		/* antenna number */
	u8 payload[0];		/* payload... */
} __attribute__ ((packed));

struct iwl_rt_tx_hdr {
	struct ieee80211_radiotap_header rt_hdr;
	u8 rt_rate;		/* rate in 500kb/s */
	__le16 rt_channel;	/* channel in mHz */
	__le16 rt_chbitmask;	/* channel bitfield */
	s8 rt_dbmsignal;	/* signal in dBm, kluged to signed */
	u8 rt_antenna;		/* antenna number */
	u8 payload[0];		/* payload... */
} __attribute__ ((packed));

/*
 * Generic queue structure
 *
 * Contains common data for Rx and Tx queues
 */
struct iwl_queue {
	int n_bd;              /* number of BDs in this queue */
	int first_empty;       /* 1-st empty entry (index) host_w*/
	int last_used;         /* last used entry (index) host_r*/
	dma_addr_t dma_addr;   /* physical addr for BD's */
	int n_window;	       /* safe queue window */
	u32 id;
	int low_mark;	       /* low watermark, resume queue if free
				* space more than this */
	int high_mark;         /* high watermark, stop queue if free
				* space less than this */
} __attribute__ ((packed));

#define MAX_NUM_OF_TBS          (20)

struct iwl_tx_info {
	struct ieee80211_tx_status status;
	struct sk_buff *skb[MAX_NUM_OF_TBS];
};

/**
 * struct iwl_tx_queue - Tx Queue for DMA
 * @need_update: need to update read/write index
 * @shed_retry: queue is HT AGG enabled
 *
 * Queue consists of circular buffer of BD's and required locking structures.
 */
struct iwl_tx_queue {
	struct iwl_queue q;
	struct iwl_tfd_frame *bd;
	struct iwl_cmd *cmd;
	dma_addr_t dma_addr_cmd;
	struct iwl_tx_info *txb;
	int need_update;
	int sched_retry;
	int active;
};

#include "iwl-channel.h"

#if IWL == 3945
#include "iwl-3945-rs.h"
#else
#include "iwl-4965-rs.h"
#endif

#define IWL_TX_FIFO_AC0	0
#define IWL_TX_FIFO_AC1	1
#define IWL_TX_FIFO_AC2	2
#define IWL_TX_FIFO_AC3	3
#define IWL_TX_FIFO_HCCA_1	5
#define IWL_TX_FIFO_HCCA_2	6
#define IWL_TX_FIFO_NONE	7

/* Minimum number of queues. MAX_NUM is defined in hw specific files */
#define IWL_MIN_NUM_QUEUES	4

/* Power management (not Tx power) structures */

struct iwl_power_vec_entry {
	struct iwl_powertable_cmd cmd;
	u8 no_dtim;
};
#define IWL_POWER_RANGE_0  (0)
#define IWL_POWER_RANGE_1  (1)

#define IWL_POWER_MODE_CAM	0x00	/* Continuously Aware Mode, always on */
#define IWL_POWER_INDEX_3	0x03
#define IWL_POWER_INDEX_5	0x05
#define IWL_POWER_AC		0x06
#define IWL_POWER_BATTERY	0x07
#define IWL_POWER_LIMIT		0x07
#define IWL_POWER_MASK		0x0F
#define IWL_POWER_ENABLED	0x10
#define IWL_POWER_LEVEL(x)	((x) & IWL_POWER_MASK)

struct iwl_power_mgr {
	spinlock_t lock;
	struct iwl_power_vec_entry pwr_range_0[IWL_POWER_AC];
	struct iwl_power_vec_entry pwr_range_1[IWL_POWER_AC];
	u8 active_index;
	u32 dtim_val;
};

#define IEEE80211_DATA_LEN              2304
#define IEEE80211_4ADDR_LEN             30
#define IEEE80211_HLEN                  (IEEE80211_4ADDR_LEN)
#define IEEE80211_FRAME_LEN             (IEEE80211_DATA_LEN + IEEE80211_HLEN)

struct iwl_frame {
	union {
		struct ieee80211_hdr frame;
		struct iwl_tx_beacon_cmd beacon;
		u8 raw[IEEE80211_FRAME_LEN];
		u8 cmd[360];
	} u;
	struct list_head list;
};

#define SEQ_TO_QUEUE(x)  ((x >> 8) & 0xbf)
#define QUEUE_TO_SEQ(x)  ((x & 0xbf) << 8)
#define SEQ_TO_INDEX(x) (x & 0xff)
#define INDEX_TO_SEQ(x) (x & 0xff)
#define SEQ_HUGE_FRAME  (0x4000)
#define SEQ_RX_FRAME    __constant_cpu_to_le16(0x8000)
#define SEQ_TO_SN(seq) (((seq) & IEEE80211_SCTL_SEQ) >> 4)
#define SN_TO_SEQ(ssn) (((ssn) << 4) & IEEE80211_SCTL_SEQ)
#define MAX_SN ((IEEE80211_SCTL_SEQ) >> 4)

enum {
	/* CMD_SIZE_NORMAL = 0, */
	CMD_SIZE_HUGE = (1 << 0),
	/* CMD_SYNC = 0, */
	CMD_ASYNC = (1 << 1),
	/* CMD_NO_SKB = 0, */
	CMD_WANT_SKB = (1 << 2),
};

struct iwl_cmd;
struct iwl_priv;

struct iwl_cmd_meta {
	struct iwl_cmd_meta *source;
	union {
		struct sk_buff *skb;
		int (*callback)(struct iwl_priv *priv,
				struct iwl_cmd *cmd, struct sk_buff *skb);
	} __attribute__ ((packed)) u;

	/* The CMD_SIZE_HUGE flag bit indicates that the command
	 * structure is stored at the end of the shared queue memory. */
	u32 flags;

} __attribute__ ((packed));

struct iwl_cmd {
	struct iwl_cmd_meta meta;
	struct iwl_cmd_header hdr;
	union {
		struct iwl_addsta_cmd addsta;
		struct iwl_led_cmd led;
		u32 flags;
		u8 val8;
		u16 val16;
		u32 val32;
		struct iwl_bt_cmd bt;
		struct iwl_rxon_time_cmd rxon_time;
		struct iwl_powertable_cmd powertable;
		struct iwl_qosparam_cmd qosparam;
		struct iwl_tx_cmd tx;
		struct iwl_tx_beacon_cmd tx_beacon;
		struct iwl_rxon_assoc_cmd rxon_assoc;
		u8 *indirect;
		u8 payload[360];
	} __attribute__ ((packed)) cmd;
} __attribute__ ((packed));

struct iwl_host_cmd {
	u8 id;
	u16 len;
	struct iwl_cmd_meta meta;
	const void *data;
};

#define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_cmd) - \
			      sizeof(struct iwl_cmd_meta))

/*
 * RX related structures and functions
 */
#define RX_FREE_BUFFERS 64
#define RX_LOW_WATERMARK 8

#define SUP_RATE_11A_MAX_NUM_CHANNELS  8
#define SUP_RATE_11B_MAX_NUM_CHANNELS  4
#define SUP_RATE_11G_MAX_NUM_CHANNELS  12

/**
 * struct iwl_rx_queue - Rx queue
 * @processed: Internal index to last handled Rx packet
 * @read: Shared index to newest available Rx buffer
 * @write: Shared index to oldest written Rx packet
 * @free_count: Number of pre-allocated buffers in rx_free
 * @rx_free: list of free SKBs for use
 * @rx_used: List of Rx buffers with no SKB
 * @need_update: flag to indicate we need to update read/write index
 *
 * NOTE:  rx_free and rx_used are used as a FIFO for iwl_rx_mem_buffers
 */
struct iwl_rx_queue {
	__le32 *bd;
	dma_addr_t dma_addr;
	struct iwl_rx_mem_buffer pool[RX_QUEUE_SIZE + RX_FREE_BUFFERS];
	struct iwl_rx_mem_buffer *queue[RX_QUEUE_SIZE];
	u32 processed;
	u32 read;
	u32 write;
	u32 free_count;
	struct list_head rx_free;
	struct list_head rx_used;
	int need_update;
	spinlock_t lock;
};

#define IWL_SUPPORTED_RATES_IE_LEN         8

#define SCAN_INTERVAL 100

#define MAX_A_CHANNELS  252
#define MIN_A_CHANNELS  7