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linux/drivers/net/wireless/ath/ath6kl/htc.h

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/*
* Copyright (c) 2004-2011 Atheros Communications Inc.
*
* Permission to use, copy, modify, and/or 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.
*/
#ifndef HTC_H
#define HTC_H
#include "common.h"
/* frame header flags */
/* send direction */
#define HTC_FLAGS_NEED_CREDIT_UPDATE (1 << 0)
#define HTC_FLAGS_SEND_BUNDLE (1 << 1)
/* receive direction */
#define HTC_FLG_RX_UNUSED (1 << 0)
#define HTC_FLG_RX_TRAILER (1 << 1)
/* Bundle count maske and shift */
#define HTC_FLG_RX_BNDL_CNT (0xF0)
#define HTC_FLG_RX_BNDL_CNT_S 4
#define HTC_HDR_LENGTH (sizeof(struct htc_frame_hdr))
#define HTC_MAX_PAYLOAD_LENGTH (4096 - sizeof(struct htc_frame_hdr))
/* HTC control message IDs */
#define HTC_MSG_READY_ID 1
#define HTC_MSG_CONN_SVC_ID 2
#define HTC_MSG_CONN_SVC_RESP_ID 3
#define HTC_MSG_SETUP_COMPLETE_ID 4
#define HTC_MSG_SETUP_COMPLETE_EX_ID 5
#define HTC_MAX_CTRL_MSG_LEN 256
#define HTC_VERSION_2P0 0x00
#define HTC_VERSION_2P1 0x01
#define HTC_SERVICE_META_DATA_MAX_LENGTH 128
#define HTC_CONN_FLGS_THRESH_LVL_QUAT 0x0
#define HTC_CONN_FLGS_THRESH_LVL_HALF 0x1
#define HTC_CONN_FLGS_THRESH_LVL_THREE_QUAT 0x2
#define HTC_CONN_FLGS_REDUCE_CRED_DRIB 0x4
#define HTC_CONN_FLGS_THRESH_MASK 0x3
/* connect response status codes */
#define HTC_SERVICE_SUCCESS 0
#define HTC_SERVICE_NOT_FOUND 1
#define HTC_SERVICE_FAILED 2
/* no resources (i.e. no more endpoints) */
#define HTC_SERVICE_NO_RESOURCES 3
/* specific service is not allowing any more endpoints */
#define HTC_SERVICE_NO_MORE_EP 4
/* report record IDs */
#define HTC_RECORD_NULL 0
#define HTC_RECORD_CREDITS 1
#define HTC_RECORD_LOOKAHEAD 2
#define HTC_RECORD_LOOKAHEAD_BUNDLE 3
#define HTC_SETUP_COMP_FLG_RX_BNDL_EN (1 << 0)
#define MAKE_SERVICE_ID(group, index) \
(int)(((int)group << 8) | (int)(index))
/* NOTE: service ID of 0x0000 is reserved and should never be used */
#define HTC_CTRL_RSVD_SVC MAKE_SERVICE_ID(RSVD_SERVICE_GROUP, 1)
#define WMI_CONTROL_SVC MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 0)
#define WMI_DATA_BE_SVC MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 1)
#define WMI_DATA_BK_SVC MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 2)
#define WMI_DATA_VI_SVC MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 3)
#define WMI_DATA_VO_SVC MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 4)
#define WMI_MAX_SERVICES 5
/* reserved and used to flush ALL packets */
#define HTC_TX_PACKET_TAG_ALL 0
#define HTC_SERVICE_TX_PACKET_TAG 1
#define HTC_TX_PACKET_TAG_USER_DEFINED (HTC_SERVICE_TX_PACKET_TAG + 9)
/* more packets on this endpoint are being fetched */
#define HTC_RX_FLAGS_INDICATE_MORE_PKTS (1 << 0)
/* TODO.. for BMI */
#define ENDPOINT1 0
/* TODO -remove me, but we have to fix BMI first */
#define HTC_MAILBOX_NUM_MAX 4
/* enable send bundle padding for this endpoint */
#define HTC_FLGS_TX_BNDL_PAD_EN (1 << 0)
#define HTC_EP_ACTIVE ((u32) (1u << 31))
/* HTC operational parameters */
#define HTC_TARGET_RESPONSE_TIMEOUT 2000 /* in ms */
#define HTC_TARGET_DEBUG_INTR_MASK 0x01
#define HTC_TARGET_CREDIT_INTR_MASK 0xF0
#define HTC_HOST_MAX_MSG_PER_BUNDLE 8
#define HTC_MIN_HTC_MSGS_TO_BUNDLE 2
/* packet flags */
#define HTC_RX_PKT_IGNORE_LOOKAHEAD (1 << 0)
#define HTC_RX_PKT_REFRESH_HDR (1 << 1)
#define HTC_RX_PKT_PART_OF_BUNDLE (1 << 2)
#define HTC_RX_PKT_NO_RECYCLE (1 << 3)
#define NUM_CONTROL_BUFFERS 8
#define NUM_CONTROL_TX_BUFFERS 2
#define NUM_CONTROL_RX_BUFFERS (NUM_CONTROL_BUFFERS - NUM_CONTROL_TX_BUFFERS)
#define HTC_RECV_WAIT_BUFFERS (1 << 0)
#define HTC_OP_STATE_STOPPING (1 << 0)
/*
* The frame header length and message formats defined herein were selected
* to accommodate optimal alignment for target processing. This reduces
* code size and improves performance. Any changes to the header length may
* alter the alignment and cause exceptions on the target. When adding to
* the messagestructures insure that fields are properly aligned.
*/
/* HTC frame header
*
* NOTE: do not remove or re-arrange the fields, these are minimally
* required to take advantage of 4-byte lookaheads in some hardware
* implementations.
*/
struct htc_frame_hdr {
u8 eid;
u8 flags;
/* length of data (including trailer) that follows the header */
__le16 payld_len;
/* end of 4-byte lookahead */
u8 ctrl[2];
} __packed;
/* HTC ready message */
struct htc_ready_msg {
__le16 msg_id;
__le16 cred_cnt;
__le16 cred_sz;
u8 max_ep;
u8 pad;
} __packed;
/* extended HTC ready message */
struct htc_ready_ext_msg {
struct htc_ready_msg ver2_0_info;
u8 htc_ver;
u8 msg_per_htc_bndl;
} __packed;
/* connect service */
struct htc_conn_service_msg {
__le16 msg_id;
__le16 svc_id;
__le16 conn_flags;
u8 svc_meta_len;
u8 pad;
} __packed;
/* connect response */
struct htc_conn_service_resp {
__le16 msg_id;
__le16 svc_id;
u8 status;
u8 eid;
__le16 max_msg_sz;
u8 svc_meta_len;
u8 pad;
} __packed;
struct htc_setup_comp_msg {
__le16 msg_id;
} __packed;
/* extended setup completion message */
struct htc_setup_comp_ext_msg {
__le16 msg_id;
__le32 flags;
u8 msg_per_rxbndl;
u8 Rsvd[3];
} __packed;
struct htc_record_hdr {
u8 rec_id;
u8 len;
} __packed;
struct htc_credit_report {
u8 eid;
u8 credits;
} __packed;
/*
* NOTE: The lk_ahd array is guarded by a pre_valid
* and Post Valid guard bytes. The pre_valid bytes must
* equal the inverse of the post_valid byte.
*/
struct htc_lookahead_report {
u8 pre_valid;
u8 lk_ahd[4];
u8 post_valid;
} __packed;
struct htc_bundle_lkahd_rpt {
u8 lk_ahd[4];
} __packed;
/* Current service IDs */
enum htc_service_grp_ids {
RSVD_SERVICE_GROUP = 0,
WMI_SERVICE_GROUP = 1,
HTC_TEST_GROUP = 254,
HTC_SERVICE_GROUP_LAST = 255
};
/* ------ endpoint IDS ------ */
enum htc_endpoint_id {
ENDPOINT_UNUSED = -1,
ENDPOINT_0 = 0,
ENDPOINT_1 = 1,
ENDPOINT_2 = 2,
ENDPOINT_3,
ENDPOINT_4,
ENDPOINT_5,
ENDPOINT_6,
ENDPOINT_7,
ENDPOINT_8,
ENDPOINT_MAX,
};
struct htc_tx_packet_info {
u16 tag;
int cred_used;
u8 flags;
int seqno;
};
struct htc_rx_packet_info {
u32 exp_hdr;
u32 rx_flags;
u32 indicat_flags;
};
struct htc_target;
/* wrapper around endpoint-specific packets */
struct htc_packet {
struct list_head list;
/* caller's per packet specific context */
void *pkt_cntxt;
/*
* the true buffer start , the caller can store the real
* buffer start here. In receive callbacks, the HTC layer
* sets buf to the start of the payload past the header.
* This field allows the caller to reset buf when it recycles
* receive packets back to HTC.
*/
u8 *buf_start;
/*
* Pointer to the start of the buffer. In the transmit
* direction this points to the start of the payload. In the
* receive direction, however, the buffer when queued up
* points to the start of the HTC header but when returned
* to the caller points to the start of the payload
*/
u8 *buf;
u32 buf_len;
/* actual length of payload */
u32 act_len;
/* endpoint that this packet was sent/recv'd from */
enum htc_endpoint_id endpoint;
/* completion status */
int status;
union {
struct htc_tx_packet_info tx;
struct htc_rx_packet_info rx;
} info;
void (*completion) (struct htc_target *, struct htc_packet *);
struct htc_target *context;
};
enum htc_send_full_action {
HTC_SEND_FULL_KEEP = 0,
HTC_SEND_FULL_DROP = 1,
};
struct htc_ep_callbacks {
void (*rx) (struct htc_target *, struct htc_packet *);
void (*rx_refill) (struct htc_target *, enum htc_endpoint_id endpoint);
enum htc_send_full_action (*tx_full) (struct htc_target *,
struct htc_packet *);
struct htc_packet *(*rx_allocthresh) (struct htc_target *,
enum htc_endpoint_id, int);
int rx_alloc_thresh;
int rx_refill_thresh;
};
/* service connection information */
struct htc_service_connect_req {
u16 svc_id;
u16 conn_flags;
struct htc_ep_callbacks ep_cb;
int max_txq_depth;
u32 flags;
unsigned int max_rxmsg_sz;
};
/* service connection response information */
struct htc_service_connect_resp {
u8 buf_len;
u8 act_len;
enum htc_endpoint_id endpoint;
unsigned int len_max;
u8 resp_code;
};
/* endpoint distributionstructure */
struct htc_endpoint_credit_dist {
struct list_head list;
/* Service ID (set by HTC) */
u16 svc_id;
/* endpoint for this distributionstruct (set by HTC) */
enum htc_endpoint_id endpoint;
u32 dist_flags;
/*
* credits for normal operation, anything above this
* indicates the endpoint is over-subscribed.
*/
int cred_norm;
/* floor for credit distribution */
int cred_min;
int cred_assngd;
/* current credits available */
int credits;
/*
* pending credits to distribute on this endpoint, this
* is set by HTC when credit reports arrive. The credit
* distribution functions sets this to zero when it distributes
* the credits.
*/
int cred_to_dist;
/*
* the number of credits that the current pending TX packet needs
* to transmit. This is set by HTC when endpoint needs credits in
* order to transmit.
*/
int seek_cred;
/* size in bytes of each credit */
int cred_sz;
/* credits required for a maximum sized messages */
int cred_per_msg;
/* reserved for HTC use */
void *htc_rsvd;
/*
* current depth of TX queue , i.e. messages waiting for credits
* This field is valid only when HTC_CREDIT_DIST_ACTIVITY_CHANGE
* or HTC_CREDIT_DIST_SEND_COMPLETE is indicated on an endpoint
* that has non-zero credits to recover.
*/
int txq_depth;
};
/*
* credit distibution code that is passed into the distrbution function,
* there are mandatory and optional codes that must be handled
*/
enum htc_credit_dist_reason {
HTC_CREDIT_DIST_SEND_COMPLETE = 0,
HTC_CREDIT_DIST_ACTIVITY_CHANGE = 1,
HTC_CREDIT_DIST_SEEK_CREDITS,
};
struct htc_credit_state_info {
int total_avail_credits;
int cur_free_credits;
struct list_head lowestpri_ep_dist;
};
/* endpoint statistics */
struct htc_endpoint_stats {
/*
* number of times the host set the credit-low flag in a send
* message on this endpoint
*/
u32 cred_low_indicate;
u32 tx_issued;
u32 tx_pkt_bundled;
u32 tx_bundles;
u32 tx_dropped;
/* running count of total credit reports received for this endpoint */
u32 tx_cred_rpt;
/* credit reports received from this endpoint's RX packets */
u32 cred_rpt_from_rx;
/* credit reports received from RX packets of other endpoints */
u32 cred_rpt_from_other;
/* credit reports received from endpoint 0 RX packets */
u32 cred_rpt_ep0;
/* count of credits received via Rx packets on this endpoint */
u32 cred_from_rx;
/* count of credits received via another endpoint */
u32 cred_from_other;
/* count of credits received via another endpoint */
u32 cred_from_ep0;
/* count of consummed credits */
u32 cred_cosumd;
/* count of credits returned */
u32 cred_retnd;
u32 rx_pkts;
/* count of lookahead records found in Rx msg */
u32 rx_lkahds;
/* count of recv packets received in a bundle */
u32 rx_bundl;
/* count of number of bundled lookaheads */
u32 rx_bundle_lkahd;
/* count of the number of bundle indications from the HTC header */
u32 rx_bundle_from_hdr;
/* the number of times the recv allocation threshold was hit */
u32 rx_alloc_thresh_hit;
/* total number of bytes */
u32 rxalloc_thresh_byte;
};
struct htc_endpoint {
enum htc_endpoint_id eid;
u16 svc_id;
struct list_head txq;
struct list_head rx_bufq;
struct htc_endpoint_credit_dist cred_dist;
struct htc_ep_callbacks ep_cb;
int max_txq_depth;
int len_max;
int tx_proc_cnt;
int rx_proc_cnt;
struct htc_target *target;
u8 seqno;
u32 conn_flags;
struct htc_endpoint_stats ep_st;
};
struct htc_control_buffer {
struct htc_packet packet;
u8 *buf;
};
struct ath6kl_device;
/* our HTC target state */
struct htc_target {
struct htc_endpoint endpoint[ENDPOINT_MAX];
struct list_head cred_dist_list;
struct list_head free_ctrl_txbuf;
struct list_head free_ctrl_rxbuf;
struct htc_credit_state_info *cred_dist_cntxt;
int tgt_creds;
unsigned int tgt_cred_sz;
spinlock_t htc_lock;
spinlock_t rx_lock;
spinlock_t tx_lock;
struct ath6kl_device *dev;
u32 htc_flags;
u32 rx_st_flags;
enum htc_endpoint_id ep_waiting;
u8 htc_tgt_ver;
/* max messages per bundle for HTC */
int msg_per_bndl_max;
bool tx_bndl_enable;
int rx_bndl_enable;
int max_rx_bndl_sz;
int max_tx_bndl_sz;
u32 block_sz;
u32 block_mask;
int max_scat_entries;
int max_xfer_szper_scatreq;
int chk_irq_status_cnt;
};
void *ath6kl_htc_create(struct ath6kl *ar);
void ath6kl_htc_set_credit_dist(struct htc_target *target,
struct htc_credit_state_info *cred_info,
u16 svc_pri_order[], int len);
int ath6kl_htc_wait_target(struct htc_target *target);
int ath6kl_htc_start(struct htc_target *target);
int ath6kl_htc_conn_service(struct htc_target *target,
struct htc_service_connect_req *req,
struct htc_service_connect_resp *resp);
int ath6kl_htc_tx(struct htc_target *target, struct htc_packet *packet);
void ath6kl_htc_stop(struct htc_target *target);
void ath6kl_htc_cleanup(struct htc_target *target);
void ath6kl_htc_flush_txep(struct htc_target *target,
enum htc_endpoint_id endpoint, u16 tag);
void ath6kl_htc_flush_rx_buf(struct htc_target *target);
void ath6kl_htc_indicate_activity_change(struct htc_target *target,
enum htc_endpoint_id endpoint,
bool active);
int ath6kl_htc_get_rxbuf_num(struct htc_target *target,
enum htc_endpoint_id endpoint);
int ath6kl_htc_add_rxbuf_multiple(struct htc_target *target,
struct list_head *pktq);
int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target,
u32 msg_look_ahead[], int *n_pkts);
static inline void set_htc_pkt_info(struct htc_packet *packet, void *context,
u8 *buf, unsigned int len,
enum htc_endpoint_id eid, u16 tag)
{
packet->pkt_cntxt = context;
packet->buf = buf;
packet->act_len = len;
packet->endpoint = eid;
packet->info.tx.tag = tag;
}
static inline void htc_rxpkt_reset(struct htc_packet *packet)
{
packet->buf = packet->buf_start;
packet->act_len = 0;
}
static inline void set_htc_rxpkt_info(struct htc_packet *packet, void *context,
u8 *buf, unsigned long len,
enum htc_endpoint_id eid)
{
packet->pkt_cntxt = context;
packet->buf = buf;
packet->buf_start = buf;
packet->buf_len = len;
packet->endpoint = eid;
}
static inline int get_queue_depth(struct list_head *queue)
{
struct list_head *tmp_list;
int depth = 0;
list_for_each(tmp_list, queue)
depth++;
return depth;
}
#endif
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