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
  20 #include "htt.h"
  21 #include "core.h"
  22 #include "debug.h"
  23
  24 static int ath10k_htt_htc_attach(struct ath10k_htt *htt)
  25 {
  26         struct ath10k_htc_svc_conn_req conn_req;
  27         struct ath10k_htc_svc_conn_resp conn_resp;
  28         int status;
  29
  30         memset(&conn_req, 0, sizeof(conn_req));
  31         memset(&conn_resp, 0, sizeof(conn_resp));
  32
  33         conn_req.ep_ops.ep_tx_complete = ath10k_htt_htc_tx_complete;
  34         conn_req.ep_ops.ep_rx_complete = ath10k_htt_t2h_msg_handler;
  35
  36         /* connect to control service */
  37         conn_req.service_id = ATH10K_HTC_SVC_ID_HTT_DATA_MSG;
  38
  39         status = ath10k_htc_connect_service(htt->ar->htc, &conn_req,
  40                                             &conn_resp);
  41
  42         if (status)
  43                 return status;
  44
  45         htt->eid = conn_resp.eid;
  46
  47         return 0;
  48 }
  49
  50 struct ath10k_htt *ath10k_htt_attach(struct ath10k *ar)
  51 {
  52         struct ath10k_htt *htt;
  53         int ret;
  54
  55         htt = kzalloc(sizeof(*htt), GFP_KERNEL);
  56         if (!htt)
  57                 return NULL;
  58
  59         htt->ar = ar;
  60         htt->max_throughput_mbps = 800;
  61
  62         /*
  63          * Connect to HTC service.
  64          * This has to be done before calling ath10k_htt_rx_attach,
  65          * since ath10k_htt_rx_attach involves sending a rx ring configure
  66          * message to the target.
  67          */
  68         if (ath10k_htt_htc_attach(htt))
  69                 goto err_htc_attach;
  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         if (ath10k_htt_rx_attach(htt))
  78                 goto err_rx_attach;
  79
  80         /*
  81          * Prefetch enough data to satisfy target
  82          * classification engine.
  83          * This is for LL chips. HL chips will probably
  84          * transfer all frame in the tx fragment.
  85          */
  86         htt->prefetch_len =
  87                 36 + /* 802.11 + qos + ht */
  88                 4 + /* 802.1q */
  89                 8 + /* llc snap */
  90                 2; /* ip4 dscp or ip6 priority */
  91
  92         return htt;
  93
  94 err_rx_attach:
  95         ath10k_htt_tx_detach(htt);
  96 err_htc_attach:
  97         kfree(htt);
  98         return NULL;
  99 }
 100
 101 #define HTT_TARGET_VERSION_TIMEOUT_HZ (3*HZ)
 102
 103 static int ath10k_htt_verify_version(struct ath10k_htt *htt)
 104 {
 105         ath10k_dbg(ATH10K_DBG_HTT,
 106                    "htt target version %d.%d; host version %d.%d\n",
 107                     htt->target_version_major,
 108                     htt->target_version_minor,
 109                     HTT_CURRENT_VERSION_MAJOR,
 110                     HTT_CURRENT_VERSION_MINOR);
 111
 112         if (htt->target_version_major != HTT_CURRENT_VERSION_MAJOR) {
 113                 ath10k_err("htt major versions are incompatible!\n");
 114                 return -ENOTSUPP;
 115         }
 116
 117         if (htt->target_version_minor != HTT_CURRENT_VERSION_MINOR)
 118                 ath10k_warn("htt minor version differ but still compatible\n");
 119
 120         return 0;
 121 }
 122
 123 int ath10k_htt_attach_target(struct ath10k_htt *htt)
 124 {
 125         int status;
 126
 127         init_completion(&htt->target_version_received);
 128
 129         status = ath10k_htt_h2t_ver_req_msg(htt);
 130         if (status)
 131                 return status;
 132
 133         status = wait_for_completion_timeout(&htt->target_version_received,
 134                                                 HTT_TARGET_VERSION_TIMEOUT_HZ);
 135         if (status <= 0) {
 136                 ath10k_warn("htt version request timed out\n");
 137                 return -ETIMEDOUT;
 138         }
 139
 140         status = ath10k_htt_verify_version(htt);
 141         if (status)
 142                 return status;
 143
 144         return ath10k_htt_send_rx_ring_cfg_ll(htt);
 145 }
 146
 147 void ath10k_htt_detach(struct ath10k_htt *htt)
 148 {
 149         ath10k_htt_rx_detach(htt);
 150         ath10k_htt_tx_detach(htt);
 151         kfree(htt);
 152 }