LXR linux/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
  24static 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
  50struct 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
  94err_rx_attach:
  95        ath10k_htt_tx_detach(htt);
  96err_htc_attach:
  97        kfree(htt);
  98        return NULL;
  99}
 100
 101#define HTT_TARGET_VERSION_TIMEOUT_HZ (3*HZ)
 102
 103static 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
 123int 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
 147void ath10k_htt_detach(struct ath10k_htt *htt)
 148{
 149        ath10k_htt_rx_detach(htt);
 150        ath10k_htt_tx_detach(htt);
 151        kfree(htt);
 152}
 153