/*
 * Copyright (c) 2004-2008 Reyk Floeter <reyk@openbsd.org>
 * Copyright (c) 2006-2008 Nick Kossifidis <mickflemm@gmail.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

/*
 * RX/TX descriptor structures
 */

/**
 * struct ath5k_hw_rx_ctl - Common hardware RX control descriptor
 * @rx_control_0: RX control word 0
 * @rx_control_1: RX control word 1
 */
struct ath5k_hw_rx_ctl {
        u32     rx_control_0;
        u32     rx_control_1;
} __packed __aligned(4);

/* RX control word 1 fields/flags */
#define AR5K_DESC_RX_CTL1_BUF_LEN               0x00000fff /* data buffer length */
#define AR5K_DESC_RX_CTL1_INTREQ                0x00002000 /* RX interrupt request */

/**
 * struct ath5k_hw_rx_status - Common hardware RX status descriptor
 * @rx_status_0: RX status word 0
 * @rx_status_1: RX status word 1
 *
 * 5210, 5211 and 5212 differ only in the fields and flags defined below
 */
struct ath5k_hw_rx_status {
        u32     rx_status_0;
        u32     rx_status_1;
} __packed __aligned(4);

/* 5210/5211 */
/* RX status word 0 fields/flags */
#define AR5K_5210_RX_DESC_STATUS0_DATA_LEN              0x00000fff /* RX data length */
#define AR5K_5210_RX_DESC_STATUS0_MORE                  0x00001000 /* more desc for this frame */
#define AR5K_5210_RX_DESC_STATUS0_RECEIVE_ANT_5210      0x00004000 /* [5210] receive on ant 1 */
#define AR5K_5210_RX_DESC_STATUS0_RECEIVE_RATE          0x00078000 /* reception rate */
#define AR5K_5210_RX_DESC_STATUS0_RECEIVE_RATE_S        15
#define AR5K_5210_RX_DESC_STATUS0_RECEIVE_SIGNAL        0x07f80000 /* rssi */
#define AR5K_5210_RX_DESC_STATUS0_RECEIVE_SIGNAL_S      19
#define AR5K_5210_RX_DESC_STATUS0_RECEIVE_ANT_5211      0x38000000 /* [5211] receive antenna */
#define AR5K_5210_RX_DESC_STATUS0_RECEIVE_ANT_5211_S    27

/* RX status word 1 fields/flags */
#define AR5K_5210_RX_DESC_STATUS1_DONE                  0x00000001 /* descriptor complete */
#define AR5K_5210_RX_DESC_STATUS1_FRAME_RECEIVE_OK      0x00000002 /* reception success */
#define AR5K_5210_RX_DESC_STATUS1_CRC_ERROR             0x00000004 /* CRC error */
#define AR5K_5210_RX_DESC_STATUS1_FIFO_OVERRUN_5210     0x00000008 /* [5210] FIFO overrun */
#define AR5K_5210_RX_DESC_STATUS1_DECRYPT_CRC_ERROR     0x00000010 /* decryption CRC failure */
#define AR5K_5210_RX_DESC_STATUS1_PHY_ERROR             0x000000e0 /* PHY error */
#define AR5K_5210_RX_DESC_STATUS1_PHY_ERROR_S           5
#define AR5K_5210_RX_DESC_STATUS1_KEY_INDEX_VALID       0x00000100 /* key index valid */
#define AR5K_5210_RX_DESC_STATUS1_KEY_INDEX             0x00007e00 /* decryption key index */
#define AR5K_5210_RX_DESC_STATUS1_KEY_INDEX_S           9
#define AR5K_5210_RX_DESC_STATUS1_RECEIVE_TIMESTAMP     0x0fff8000 /* 13 bit of TSF */
#define AR5K_5210_RX_DESC_STATUS1_RECEIVE_TIMESTAMP_S   15
#define AR5K_5210_RX_DESC_STATUS1_KEY_CACHE_MISS        0x10000000 /* key cache miss */

/* 5212 */
/* RX status word 0 fields/flags */
#define AR5K_5212_RX_DESC_STATUS0_DATA_LEN              0x00000fff /* RX data length */
#define AR5K_5212_RX_DESC_STATUS0_MORE                  0x00001000 /* more desc for this frame */
#define AR5K_5212_RX_DESC_STATUS0_DECOMP_CRC_ERROR      0x00002000 /* decompression CRC error */
#define AR5K_5212_RX_DESC_STATUS0_RECEIVE_RATE          0x000f8000 /* reception rate */
#define AR5K_5212_RX_DESC_STATUS0_RECEIVE_RATE_S        15
#define AR5K_5212_RX_DESC_STATUS0_RECEIVE_SIGNAL        0x0ff00000 /* rssi */
#define AR5K_5212_RX_DESC_STATUS0_RECEIVE_SIGNAL_S      20
#define AR5K_5212_RX_DESC_STATUS0_RECEIVE_ANTENNA       0xf0000000 /* receive antenna */
#define AR5K_5212_RX_DESC_STATUS0_RECEIVE_ANTENNA_S     28

/* RX status word 1 fields/flags */
#define AR5K_5212_RX_DESC_STATUS1_DONE                  0x00000001 /* descriptor complete */
#define AR5K_5212_RX_DESC_STATUS1_FRAME_RECEIVE_OK      0x00000002 /* frame reception success */
#define AR5K_5212_RX_DESC_STATUS1_CRC_ERROR             0x00000004 /* CRC error */
#define AR5K_5212_RX_DESC_STATUS1_DECRYPT_CRC_ERROR     0x00000008 /* decryption CRC failure */
#define AR5K_5212_RX_DESC_STATUS1_PHY_ERROR             0x00000010 /* PHY error */
#define AR5K_5212_RX_DESC_STATUS1_MIC_ERROR             0x00000020 /* MIC decrypt error */
#define AR5K_5212_RX_DESC_STATUS1_KEY_INDEX_VALID       0x00000100 /* key index valid */
#define AR5K_5212_RX_DESC_STATUS1_KEY_INDEX             0x0000fe00 /* decryption key index */
#define AR5K_5212_RX_DESC_STATUS1_KEY_INDEX_S           9
#define AR5K_5212_RX_DESC_STATUS1_RECEIVE_TIMESTAMP     0x7fff0000 /* first 15bit of the TSF */
#define AR5K_5212_RX_DESC_STATUS1_RECEIVE_TIMESTAMP_S   16
#define AR5K_5212_RX_DESC_STATUS1_KEY_CACHE_MISS        0x80000000 /* key cache miss */
#define AR5K_5212_RX_DESC_STATUS1_PHY_ERROR_CODE        0x0000ff00 /* phy error code overlays key index and valid fields */
#define AR5K_5212_RX_DESC_STATUS1_PHY_ERROR_CODE_S      8

/**
 * enum ath5k_phy_error_code - PHY Error codes
 * @AR5K_RX_PHY_ERROR_UNDERRUN: Transmit underrun, [5210] No error
 * @AR5K_RX_PHY_ERROR_TIMING: Timing error
 * @AR5K_RX_PHY_ERROR_PARITY: Illegal parity
 * @AR5K_RX_PHY_ERROR_RATE: Illegal rate
 * @AR5K_RX_PHY_ERROR_LENGTH: Illegal length
 * @AR5K_RX_PHY_ERROR_RADAR: Radar detect, [5210] 64 QAM rate
 * @AR5K_RX_PHY_ERROR_SERVICE: Illegal service
 * @AR5K_RX_PHY_ERROR_TOR: Transmit override receive
 * @AR5K_RX_PHY_ERROR_OFDM_TIMING: OFDM Timing error [5212+]
 * @AR5K_RX_PHY_ERROR_OFDM_SIGNAL_PARITY: OFDM Signal parity error [5212+]
 * @AR5K_RX_PHY_ERROR_OFDM_RATE_ILLEGAL: OFDM Illegal rate [5212+]
 * @AR5K_RX_PHY_ERROR_OFDM_LENGTH_ILLEGAL: OFDM Illegal length [5212+]
 * @AR5K_RX_PHY_ERROR_OFDM_POWER_DROP: OFDM Power drop [5212+]
 * @AR5K_RX_PHY_ERROR_OFDM_SERVICE: OFDM Service (?) [5212+]
 * @AR5K_RX_PHY_ERROR_OFDM_RESTART: OFDM Restart (?) [5212+]
 * @AR5K_RX_PHY_ERROR_CCK_TIMING: CCK Timing error [5212+]
 * @AR5K_RX_PHY_ERROR_CCK_HEADER_CRC: Header CRC error [5212+]
 * @AR5K_RX_PHY_ERROR_CCK_RATE_ILLEGAL: Illegal rate [5212+]
 * @AR5K_RX_PHY_ERROR_CCK_SERVICE: CCK Service (?) [5212+]
 * @AR5K_RX_PHY_ERROR_CCK_RESTART: CCK Restart (?) [5212+]
 */
enum ath5k_phy_error_code {
        AR5K_RX_PHY_ERROR_UNDERRUN              = 0,
        AR5K_RX_PHY_ERROR_TIMING                = 1,
        AR5K_RX_PHY_ERROR_PARITY                = 2,
        AR5K_RX_PHY_ERROR_RATE                  = 3,
        AR5K_RX_PHY_ERROR_LENGTH                = 4,
        AR5K_RX_PHY_ERROR_RADAR                 = 5,
        AR5K_RX_PHY_ERROR_SERVICE               = 6,
        AR5K_RX_PHY_ERROR_TOR                   = 7,
        AR5K_RX_PHY_ERROR_OFDM_TIMING           = 17,
        AR5K_RX_PHY_ERROR_OFDM_SIGNAL_PARITY    = 18,
        AR5K_RX_PHY_ERROR_OFDM_RATE_ILLEGAL     = 19,
        AR5K_RX_PHY_ERROR_OFDM_LENGTH_ILLEGAL   = 20,
        AR5K_RX_PHY_ERROR_OFDM_POWER_DROP       = 21,
        AR5K_RX_PHY_ERROR_OFDM_SERVICE          = 22,
        AR5K_RX_PHY_ERROR_OFDM_RESTART          = 23,
        AR5K_RX_PHY_ERROR_CCK_TIMING            = 25,
        AR5K_RX_PHY_ERROR_CCK_HEADER_CRC        = 26,
        AR5K_RX_PHY_ERROR_CCK_RATE_ILLEGAL      = 27,
        AR5K_RX_PHY_ERROR_CCK_SERVICE           = 30,
        AR5K_RX_PHY_ERROR_CCK_RESTART           = 31,
};

/**
 * struct ath5k_hw_2w_tx_ctl  - 5210/5211 hardware 2-word TX control descriptor
 * @tx_control_0: TX control word 0
 * @tx_control_1: TX control word 1
 */
struct ath5k_hw_2w_tx_ctl {
        u32     tx_control_0;
        u32     tx_control_1;
} __packed __aligned(4);

/* TX control word 0 fields/flags */
#define AR5K_2W_TX_DESC_CTL0_FRAME_LEN          0x00000fff /* frame length */
#define AR5K_2W_TX_DESC_CTL0_HEADER_LEN_5210    0x0003f000 /* [5210] header length */
#define AR5K_2W_TX_DESC_CTL0_HEADER_LEN_5210_S  12
#define AR5K_2W_TX_DESC_CTL0_XMIT_RATE          0x003c0000 /* tx rate */
#define AR5K_2W_TX_DESC_CTL0_XMIT_RATE_S        18
#define AR5K_2W_TX_DESC_CTL0_RTSENA             0x00400000 /* RTS/CTS enable */
#define AR5K_2W_TX_DESC_CTL0_LONG_PACKET_5210   0x00800000 /* [5210] long packet */
#define AR5K_2W_TX_DESC_CTL0_VEOL_5211          0x00800000 /* [5211] virtual end-of-list */
#define AR5K_2W_TX_DESC_CTL0_CLRDMASK           0x01000000 /* clear destination mask */
#define AR5K_2W_TX_DESC_CTL0_ANT_MODE_XMIT_5210 0x02000000 /* [5210] antenna selection */
#define AR5K_2W_TX_DESC_CTL0_ANT_MODE_XMIT_5211 0x1e000000 /* [5211] antenna selection */
#define AR5K_2W_TX_DESC_CTL0_ANT_MODE_XMIT                      \
                (ah->ah_version == AR5K_AR5210 ?                \
                AR5K_2W_TX_DESC_CTL0_ANT_MODE_XMIT_5210 :       \
                AR5K_2W_TX_DESC_CTL0_ANT_MODE_XMIT_5211)
#define AR5K_2W_TX_DESC_CTL0_ANT_MODE_XMIT_S    25
#define AR5K_2W_TX_DESC_CTL0_FRAME_TYPE_5210    0x1c000000 /* [5210] frame type */
#define AR5K_2W_TX_DESC_CTL0_FRAME_TYPE_5210_S  26
#define AR5K_2W_TX_DESC_CTL0_INTREQ             0x20000000 /* TX interrupt request */
#define AR5K_2W_TX_DESC_CTL0_ENCRYPT_KEY_VALID  0x40000000 /* key is valid */

/* TX control word 1 fields/flags */
#define AR5K_2W_TX_DESC_CTL1_BUF_LEN            0x00000fff /* data buffer length */
#define AR5K_2W_TX_DESC_CTL1_MORE               0x00001000 /* more desc for this frame */
#define AR5K_2W_TX_DESC_CTL1_ENC_KEY_IDX_5210   0x0007e000 /* [5210] key table index */
#define AR5K_2W_TX_DESC_CTL1_ENC_KEY_IDX_5211   0x000fe000 /* [5211] key table index */
#define AR5K_2W_TX_DESC_CTL1_ENC_KEY_IDX                                \
                        (ah->ah_version == AR5K_AR5210 ?                \
                        AR5K_2W_TX_DESC_CTL1_ENC_KEY_IDX_5210 :         \
                        AR5K_2W_TX_DESC_CTL1_ENC_KEY_IDX_5211)
#define AR5K_2W_TX_DESC_CTL1_ENC_KEY_IDX_S      13
#define AR5K_2W_TX_DESC_CTL1_FRAME_TYPE_5211    0x00700000 /* [5211] frame type */
#define AR5K_2W_TX_DESC_CTL1_FRAME_TYPE_5211_S  20
#define AR5K_2W_TX_DESC_CTL1_NOACK_5211         0x00800000 /* [5211] no ACK */
#define AR5K_2W_TX_DESC_CTL1_RTS_DURATION_5210  0xfff80000 /* [5210] lower 13 bit of duration */

/* Frame types */
#define AR5K_AR5210_TX_DESC_FRAME_TYPE_NORMAL   0
#define AR5K_AR5210_TX_DESC_FRAME_TYPE_ATIM     1
#define AR5K_AR5210_TX_DESC_FRAME_TYPE_PSPOLL   2
#define AR5K_AR5210_TX_DESC_FRAME_TYPE_NO_DELAY 3
#define AR5K_AR5211_TX_DESC_FRAME_TYPE_BEACON   3
#define AR5K_AR5210_TX_DESC_FRAME_TYPE_PIFS     4
#define AR5K_AR5211_TX_DESC_FRAME_TYPE_PRESP    4

/**
 * struct ath5k_hw_4w_tx_ctl - 5212 hardware 4-word TX control descriptor
 * @tx_control_0: TX control word 0
 * @tx_control_1: TX control word 1
 * @tx_control_2: TX control word 2
 * @tx_control_3: TX control word 3
 */
struct ath5k_hw_4w_tx_ctl {
        u32     tx_control_0;
        u32     tx_control_1;
        u32     tx_control_2;
        u32     tx_control_3;
} __packed __aligned(4);

/* TX control word 0 fields/flags */
#define AR5K_4W_TX_DESC_CTL0_FRAME_LEN          0x00000fff /* frame length */
#define AR5K_4W_TX_DESC_CTL0_XMIT_POWER         0x003f0000 /* transmit power */
#define AR5K_4W_TX_DESC_CTL0_XMIT_POWER_S       16
#define AR5K_4W_TX_DESC_CTL0_RTSENA             0x00400000 /* RTS/CTS enable */
#define AR5K_4W_TX_DESC_CTL0_VEOL               0x00800000 /* virtual end-of-list */
#define AR5K_4W_TX_DESC_CTL0_CLRDMASK           0x01000000 /* clear destination mask */
#define AR5K_4W_TX_DESC_CTL0_ANT_MODE_XMIT      0x1e000000 /* TX antenna selection */
#define AR5K_4W_TX_DESC_CTL0_ANT_MODE_XMIT_S    25
#define AR5K_4W_TX_DESC_CTL0_INTREQ             0x20000000 /* TX interrupt request */
#define AR5K_4W_TX_DESC_CTL0_ENCRYPT_KEY_VALID  0x40000000 /* destination index valid */
#define AR5K_4W_TX_DESC_CTL0_CTSENA             0x80000000 /* precede frame with CTS */

/* TX control word 1 fields/flags */
#define AR5K_4W_TX_DESC_CTL1_BUF_LEN            0x00000fff /* data buffer length */
#define AR5K_4W_TX_DESC_CTL1_MORE               0x00001000 /* more desc for this frame */
#define AR5K_4W_TX_DESC_CTL1_ENCRYPT_KEY_IDX    0x000fe000 /* destination table index */
#define AR5K_4W_TX_DESC_CTL1_ENCRYPT_KEY_IDX_S  13
#define AR5K_4W_TX_DESC_CTL1_FRAME_TYPE         0x00f00000 /* frame type */
#define AR5K_4W_TX_DESC_CTL1_FRAME_TYPE_S       20
#define AR5K_4W_TX_DESC_CTL1_NOACK              0x01000000 /* no ACK */
#define AR5K_4W_TX_DESC_CTL1_COMP_PROC          0x06000000 /* compression processing */
#define AR5K_4W_TX_DESC_CTL1_COMP_PROC_S        25
#define AR5K_4W_TX_DESC_CTL1_COMP_IV_LEN        0x18000000 /* length of frame IV */
#define AR5K_4W_TX_DESC_CTL1_COMP_IV_LEN_S      27
#define AR5K_4W_TX_DESC_CTL1_COMP_ICV_LEN       0x60000000 /* length of frame ICV */
#define AR5K_4W_TX_DESC_CTL1_COMP_ICV_LEN_S     29

/* TX control word 2 fields/flags */
#define AR5K_4W_TX_DESC_CTL2_RTS_DURATION       0x00007fff /* RTS/CTS duration */
#define AR5K_4W_TX_DESC_CTL2_DURATION_UPD_EN    0x00008000 /* frame duration update */
#define AR5K_4W_TX_DESC_CTL2_XMIT_TRIES0        0x000f0000 /* series 0 max attempts */
#define AR5K_4W_TX_DESC_CTL2_XMIT_TRIES0_S      16
#define AR5K_4W_TX_DESC_CTL2_XMIT_TRIES1        0x00f00000 /* series 1 max attempts */
#define AR5K_4W_TX_DESC_CTL2_XMIT_TRIES1_S      20
#define AR5K_4W_TX_DESC_CTL2_XMIT_TRIES2        0x0f000000 /* series 2 max attempts */
#define AR5K_4W_TX_DESC_CTL2_XMIT_TRIES2_S      24
#define AR5K_4W_TX_DESC_CTL2_XMIT_TRIES3        0xf0000000 /* series 3 max attempts */
#define AR5K_4W_TX_DESC_CTL2_XMIT_TRIES3_S      28

/* TX control word 3 fields/flags */
#define AR5K_4W_TX_DESC_CTL3_XMIT_RATE0         0x0000001f /* series 0 tx rate */
#define AR5K_4W_TX_DESC_CTL3_XMIT_RATE1         0x000003e0 /* series 1 tx rate */
#define AR5K_4W_TX_DESC_CTL3_XMIT_RATE1_S       5
#define AR5K_4W_TX_DESC_CTL3_XMIT_RATE2         0x00007c00 /* series 2 tx rate */
#define AR5K_4W_TX_DESC_CTL3_XMIT_RATE2_S       10
#define AR5K_4W_TX_DESC_CTL3_XMIT_RATE3         0x000f8000 /* series 3 tx rate */
#define AR5K_4W_TX_DESC_CTL3_XMIT_RATE3_S       15
#define AR5K_4W_TX_DESC_CTL3_RTS_CTS_RATE       0x01f00000 /* RTS or CTS rate */
#define AR5K_4W_TX_DESC_CTL3_RTS_CTS_RATE_S     20

/**
 * struct ath5k_hw_tx_status - Common TX status descriptor
 * @tx_status_0: TX status word 0
 * @tx_status_1: TX status word 1
 */
struct ath5k_hw_tx_status {
        u32     tx_status_0;
        u32     tx_status_1;
} __packed __aligned(4);

/* TX status word 0 fields/flags */
#define AR5K_DESC_TX_STATUS0_FRAME_XMIT_OK      0x00000001 /* TX success */
#define AR5K_DESC_TX_STATUS0_EXCESSIVE_RETRIES  0x00000002 /* excessive retries */
#define AR5K_DESC_TX_STATUS0_FIFO_UNDERRUN      0x00000004 /* FIFO underrun */
#define AR5K_DESC_TX_STATUS0_FILTERED           0x00000008 /* TX filter indication */
/* according to the HAL sources the spec has short/long retry counts reversed.
 * we have it reversed to the HAL sources as well, for 5210 and 5211.
 * For 5212 these fields are defined as RTS_FAIL_COUNT and DATA_FAIL_COUNT,
 * but used respectively as SHORT and LONG retry count in the code later. This
 * is consistent with the definitions here... TODO: check */
#define AR5K_DESC_TX_STATUS0_SHORT_RETRY_COUNT  0x000000f0 /* short retry count */
#define AR5K_DESC_TX_STATUS0_SHORT_RETRY_COUNT_S        4
#define AR5K_DESC_TX_STATUS0_LONG_RETRY_COUNT   0x00000f00 /* long retry count */
#define AR5K_DESC_TX_STATUS0_LONG_RETRY_COUNT_S 8
#define AR5K_DESC_TX_STATUS0_VIRTCOLL_CT_5211   0x0000f000 /* [5211+] virtual collision count */
#define AR5K_DESC_TX_STATUS0_VIRTCOLL_CT_5212_S 12
#define AR5K_DESC_TX_STATUS0_SEND_TIMESTAMP     0xffff0000 /* TX timestamp */
#define AR5K_DESC_TX_STATUS0_SEND_TIMESTAMP_S   16

/* TX status word 1 fields/flags */
#define AR5K_DESC_TX_STATUS1_DONE               0x00000001 /* descriptor complete */
#define AR5K_DESC_TX_STATUS1_SEQ_NUM            0x00001ffe /* TX sequence number */
#define AR5K_DESC_TX_STATUS1_SEQ_NUM_S          1
#define AR5K_DESC_TX_STATUS1_ACK_SIG_STRENGTH   0x001fe000 /* signal strength of ACK */
#define AR5K_DESC_TX_STATUS1_ACK_SIG_STRENGTH_S 13
#define AR5K_DESC_TX_STATUS1_FINAL_TS_IX_5212   0x00600000 /* [5212] final TX attempt series ix */
#define AR5K_DESC_TX_STATUS1_FINAL_TS_IX_5212_S 21
#define AR5K_DESC_TX_STATUS1_COMP_SUCCESS_5212  0x00800000 /* [5212] compression status */
#define AR5K_DESC_TX_STATUS1_XMIT_ANTENNA_5212  0x01000000 /* [5212] transmit antenna */

/**
 * struct ath5k_hw_5210_tx_desc - 5210/5211 hardware TX descriptor
 * @tx_ctl: The &struct ath5k_hw_2w_tx_ctl
 * @tx_stat: The &struct ath5k_hw_tx_status
 */
struct ath5k_hw_5210_tx_desc {
        struct ath5k_hw_2w_tx_ctl       tx_ctl;
        struct ath5k_hw_tx_status       tx_stat;
} __packed __aligned(4);

/**
 * struct ath5k_hw_5212_tx_desc - 5212 hardware TX descriptor
 * @tx_ctl: The &struct ath5k_hw_4w_tx_ctl
 * @tx_stat: The &struct ath5k_hw_tx_status
 */
struct ath5k_hw_5212_tx_desc {
        struct ath5k_hw_4w_tx_ctl       tx_ctl;
        struct ath5k_hw_tx_status       tx_stat;
} __packed __aligned(4);

/**
 * struct ath5k_hw_all_rx_desc - Common hardware RX descriptor
 * @rx_ctl: The &struct ath5k_hw_rx_ctl
 * @rx_stat: The &struct ath5k_hw_rx_status
 */
struct ath5k_hw_all_rx_desc {
        struct ath5k_hw_rx_ctl          rx_ctl;
        struct ath5k_hw_rx_status       rx_stat;
} __packed __aligned(4);

/**
 * struct ath5k_desc - Atheros hardware DMA descriptor
 * @ds_link: Physical address of the next descriptor
 * @ds_data: Physical address of data buffer (skb)
 * @ud: Union containing hw_5xxx_tx_desc structs and hw_all_rx_desc
 *
 * This is read and written to by the hardware
 */
struct ath5k_desc {
        u32     ds_link;
        u32     ds_data;

        union {
                struct ath5k_hw_5210_tx_desc    ds_tx5210;
                struct ath5k_hw_5212_tx_desc    ds_tx5212;
                struct ath5k_hw_all_rx_desc     ds_rx;
        } ud;
} __packed __aligned(4);

#define AR5K_RXDESC_INTREQ      0x0020

#define AR5K_TXDESC_CLRDMASK    0x0001
#define AR5K_TXDESC_NOACK       0x0002  /*[5211+]*/
#define AR5K_TXDESC_RTSENA      0x0004
#define AR5K_TXDESC_CTSENA      0x0008
#define AR5K_TXDESC_INTREQ      0x0010
#define AR5K_TXDESC_VEOL        0x0020  /*[5211+]*/