drivers/net/wireless/ath/ath10k/htt.c

   1 /*
   2  * Copyright (c) 2005-2011 Atheros Communications Inc.
   3  * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include <linux/slab.h>
  19 #include <linux/if_ether.h>
  20
  21 #include "htt.h"
  22 #include "core.h"
  23 #include "debug.h"
  24
  25 static int ath10k_htt_htc_attach(struct ath10k_htt *htt)
  26 {
  27         struct ath10k_htc_svc_conn_req conn_req;
  28         struct ath10k_htc_svc_conn_resp conn_resp;
  29         int status;
  30
  31         memset(&conn_req, 0, sizeof(conn_req));
  32         memset(&conn_resp, 0, sizeof(conn_resp));
  33
  34         conn_req.ep_ops.ep_tx_complete = ath10k_htt_htc_tx_complete;
  35         conn_req.ep_ops.ep_rx_complete = ath10k_htt_t2h_msg_handler;
  36
  37         /* connect to control service */
  38         conn_req.service_id = ATH10K_HTC_SVC_ID_HTT_DATA_MSG;
  39
  40         status = ath10k_htc_connect_service(&htt->ar->htc, &conn_req,
  41                                             &conn_resp);
  42
  43         if (status)
  44                 return status;
  45
  46         htt->eid = conn_resp.eid;
  47
  48         return 0;
  49 }
  50
  51 int ath10k_htt_attach(struct ath10k *ar)
  52 {
  53         struct ath10k_htt *htt = &ar->htt;
  54         int ret;
  55
  56         htt->ar = ar;
  57         htt->max_throughput_mbps = 800;
  58
  59         /*
  60          * Connect to HTC service.
  61          * This has to be done before calling ath10k_htt_rx_attach,
  62          * since ath10k_htt_rx_attach involves sending a rx ring configure
  63          * message to the target.
  64          */
  65         ret = ath10k_htt_htc_attach(htt);
  66         if (ret) {
  67                 ath10k_err("could not attach htt htc (%d)\n", ret);
  68                 goto err_htc_attach;
  69         }
  70
  71         ret = ath10k_htt_tx_attach(htt);
  72         if (ret) {
  73                 ath10k_err("could not attach htt tx (%d)\n", ret);
  74                 goto err_htc_attach;
  75         }
  76
  77         ret = ath10k_htt_rx_attach(htt);
  78         if (ret) {
  79                 ath10k_err("could not attach htt rx (%d)\n", ret);
  80                 goto err_rx_attach;
  81         }
  82
  83         /*
  84          * Prefetch enough data to satisfy target
  85          * classification engine.
  86          * This is for LL chips. HL chips will probably
  87          * transfer all frame in the tx fragment.
  88          */
  89         htt->prefetch_len =
  90                 36 + /* 802.11 + qos + ht */
  91                 4 + /* 802.1q */
  92                 8 + /* llc snap */
  93                 2; /* ip4 dscp or ip6 priority */
  94
  95         return 0;
  96
  97 err_rx_attach:
  98         ath10k_htt_tx_detach(htt);
  99 err_htc_attach:
 100         return ret;
 101 }
 102
 103 #define HTT_TARGET_VERSION_TIMEOUT_HZ (3*HZ)
 104
 105 static int ath10k_htt_verify_version(struct ath10k_htt *htt)
 106 {
 107         ath10k_dbg(ATH10K_DBG_BOOT, "htt target version %d.%d\n",
 108                    htt->target_version_major, htt->target_version_minor);
 109
 110         if (htt->target_version_major != 2 &&
 111             htt->target_version_major != 3) {
 112                 ath10k_err("unsupported htt major version %d. supported versions are 2 and 3\n",
 113                            htt->target_version_major);
 114                 return -ENOTSUPP;
 115         }
 116
 117         return 0;
 118 }
 119
 120 int ath10k_htt_attach_target(struct ath10k_htt *htt)
 121 {
 122         int status;
 123
 124         init_completion(&htt->target_version_received);
 125
 126         status = ath10k_htt_h2t_ver_req_msg(htt);
 127         if (status)
 128                 return status;
 129
 130         status = wait_for_completion_timeout(&htt->target_version_received,
 131                                                 HTT_TARGET_VERSION_TIMEOUT_HZ);
 132         if (status <= 0) {
 133                 ath10k_warn("htt version request timed out\n");
 134                 return -ETIMEDOUT;
 135         }
 136
 137         status = ath10k_htt_verify_version(htt);
 138         if (status)
 139                 return status;
 140
 141         return ath10k_htt_send_rx_ring_cfg_ll(htt);
 142 }
 143
 144 void ath10k_htt_detach(struct ath10k_htt *htt)
 145 {
 146         ath10k_htt_rx_detach(htt);
 147         ath10k_htt_tx_detach(htt);
 148 }