+++ /dev/null
-/*
- * This file is part of wl1251
- *
- * Copyright (c) 1998-2007 Texas Instruments Incorporated
- * Copyright (C) 2008 Nokia Corporation
- *
- * Contact: Kalle Valo <kalle.valo@nokia.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 St, Fifth Floor, Boston, MA
- * 02110-1301 USA
- *
- */
-
-#ifndef __WL1251_TX_H__
-#define __WL1251_TX_H__
-
-#include <linux/bitops.h>
-#include "wl1251_acx.h"
-
-/*
- *
- * TX PATH
- *
- * The Tx path uses a double buffer and a tx_control structure, each located
- * at a fixed address in the device's memory. On startup, the host retrieves
- * the pointers to these addresses. A double buffer allows for continuous data
- * flow towards the device. The host keeps track of which buffer is available
- * and alternates between these two buffers on a per packet basis.
- *
- * The size of each of the two buffers is large enough to hold the longest
- * 802.3 packet - maximum size Ethernet packet + header + descriptor.
- * TX complete indication will be received a-synchronously in a TX done cyclic
- * buffer which is composed of 16 tx_result descriptors structures and is used
- * in a cyclic manner.
- *
- * The TX (HOST) procedure is as follows:
- * 1. Read the Tx path status, that will give the data_out_count.
- * 2. goto 1, if not possible.
- * i.e. if data_in_count - data_out_count >= HwBuffer size (2 for double
- * buffer).
- * 3. Copy the packet (preceded by double_buffer_desc), if possible.
- * i.e. if data_in_count - data_out_count < HwBuffer size (2 for double
- * buffer).
- * 4. increment data_in_count.
- * 5. Inform the firmware by generating a firmware internal interrupt.
- * 6. FW will increment data_out_count after it reads the buffer.
- *
- * The TX Complete procedure:
- * 1. To get a TX complete indication the host enables the tx_complete flag in
- * the TX descriptor Structure.
- * 2. For each packet with a Tx Complete field set, the firmware adds the
- * transmit results to the cyclic buffer (txDoneRing) and sets both done_1
- * and done_2 to 1 to indicate driver ownership.
- * 3. The firmware sends a Tx Complete interrupt to the host to trigger the
- * host to process the new data. Note: interrupt will be send per packet if
- * TX complete indication was requested in tx_control or per crossing
- * aggregation threshold.
- * 4. After receiving the Tx Complete interrupt, the host reads the
- * TxDescriptorDone information in a cyclic manner and clears both done_1
- * and done_2 fields.
- *
- */
-
-#define TX_COMPLETE_REQUIRED_BIT 0x80
-#define TX_STATUS_DATA_OUT_COUNT_MASK 0xf
-
-#define WL1251_TX_ALIGN_TO 4
-#define WL1251_TX_ALIGN(len) (((len) + WL1251_TX_ALIGN_TO - 1) & \
- ~(WL1251_TX_ALIGN_TO - 1))
-#define WL1251_TKIP_IV_SPACE 4
-
-struct tx_control {
- /* Rate Policy (class) index */
- unsigned rate_policy:3;
-
- /* When set, no ack policy is expected */
- unsigned ack_policy:1;
-
- /*
- * Packet type:
- * 0 -> 802.11
- * 1 -> 802.3
- * 2 -> IP
- * 3 -> raw codec
- */
- unsigned packet_type:2;
-
- /* If set, this is a QoS-Null or QoS-Data frame */
- unsigned qos:1;
-
- /*
- * If set, the target triggers the tx complete INT
- * upon frame sending completion.
- */
- unsigned tx_complete:1;
-
- /* 2 bytes padding before packet header */
- unsigned xfer_pad:1;
-
- unsigned reserved:7;
-} __packed;
-
-
-struct tx_double_buffer_desc {
- /* Length of payload, including headers. */
- __le16 length;
-
- /*
- * A bit mask that specifies the initial rate to be used
- * Possible values are:
- * 0x0001 - 1Mbits
- * 0x0002 - 2Mbits
- * 0x0004 - 5.5Mbits
- * 0x0008 - 6Mbits
- * 0x0010 - 9Mbits
- * 0x0020 - 11Mbits
- * 0x0040 - 12Mbits
- * 0x0080 - 18Mbits
- * 0x0100 - 22Mbits
- * 0x0200 - 24Mbits
- * 0x0400 - 36Mbits
- * 0x0800 - 48Mbits
- * 0x1000 - 54Mbits
- */
- __le16 rate;
-
- /* Time in us that a packet can spend in the target */
- __le32 expiry_time;
-
- /* index of the TX queue used for this packet */
- u8 xmit_queue;
-
- /* Used to identify a packet */
- u8 id;
-
- struct tx_control control;
-
- /*
- * The FW should cut the packet into fragments
- * of this size.
- */
- __le16 frag_threshold;
-
- /* Numbers of HW queue blocks to be allocated */
- u8 num_mem_blocks;
-
- u8 reserved;
-} __packed;
-
-enum {
- TX_SUCCESS = 0,
- TX_DMA_ERROR = BIT(7),
- TX_DISABLED = BIT(6),
- TX_RETRY_EXCEEDED = BIT(5),
- TX_TIMEOUT = BIT(4),
- TX_KEY_NOT_FOUND = BIT(3),
- TX_ENCRYPT_FAIL = BIT(2),
- TX_UNAVAILABLE_PRIORITY = BIT(1),
-};
-
-struct tx_result {
- /*
- * Ownership synchronization between the host and
- * the firmware. If done_1 and done_2 are cleared,
- * owned by the FW (no info ready).
- */
- u8 done_1;
-
- /* same as double_buffer_desc->id */
- u8 id;
-
- /*
- * Total air access duration consumed by this
- * packet, including all retries and overheads.
- */
- u16 medium_usage;
-
- /* Total media delay (from 1st EDCA AIFS counter until TX Complete). */
- u32 medium_delay;
-
- /* Time between host xfer and tx complete */
- u32 fw_hnadling_time;
-
- /* The LS-byte of the last TKIP sequence number. */
- u8 lsb_seq_num;
-
- /* Retry count */
- u8 ack_failures;
-
- /* At which rate we got a ACK */
- u16 rate;
-
- u16 reserved;
-
- /* TX_* */
- u8 status;
-
- /* See done_1 */
- u8 done_2;
-} __packed;
-
-static inline int wl1251_tx_get_queue(int queue)
-{
- switch (queue) {
- case 0:
- return QOS_AC_VO;
- case 1:
- return QOS_AC_VI;
- case 2:
- return QOS_AC_BE;
- case 3:
- return QOS_AC_BK;
- default:
- return QOS_AC_BE;
- }
-}
-
-void wl1251_tx_work(struct work_struct *work);
-void wl1251_tx_complete(struct wl1251 *wl);
-void wl1251_tx_flush(struct wl1251 *wl);
-
-#endif
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