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#include <linux/if_ether.h>
  20
  21#include "htt.h"
  22#include "core.h"
  23#include "debug.h"
  24
  25static 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
  51int 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
  97err_rx_attach:
  98        ath10k_htt_tx_detach(htt);
  99err_htc_attach:
 100        return ret;
 101}
 102
 103#define HTT_TARGET_VERSION_TIMEOUT_HZ (3*HZ)
 104
 105static int ath10k_htt_verify_version(struct ath10k_htt *htt)
 106{
 107        ath10k_dbg(ATH10K_DBG_HTT,
 108                   "htt target version %d.%d; host version %d.%d\n",
 109                    htt->target_version_major,
 110                    htt->target_version_minor,
 111                    HTT_CURRENT_VERSION_MAJOR,
 112                    HTT_CURRENT_VERSION_MINOR);
 113
 114        if (htt->target_version_major != HTT_CURRENT_VERSION_MAJOR) {
 115                ath10k_err("htt major versions are incompatible!\n");
 116                return -ENOTSUPP;
 117        }
 118
 119        if (htt->target_version_minor != HTT_CURRENT_VERSION_MINOR)
 120                ath10k_warn("htt minor version differ but still compatible\n");
 121
 122        return 0;
 123}
 124
 125int ath10k_htt_attach_target(struct ath10k_htt *htt)
 126{
 127        int status;
 128
 129        init_completion(&htt->target_version_received);
 130
 131        status = ath10k_htt_h2t_ver_req_msg(htt);
 132        if (status)
 133                return status;
 134
 135        status = wait_for_completion_timeout(&htt->target_version_received,
 136                                                HTT_TARGET_VERSION_TIMEOUT_HZ);
 137        if (status <= 0) {
 138                ath10k_warn("htt version request timed out\n");
 139                return -ETIMEDOUT;
 140        }
 141
 142        status = ath10k_htt_verify_version(htt);
 143        if (status)
 144                return status;
 145
 146        return ath10k_htt_send_rx_ring_cfg_ll(htt);
 147}
 148
 149void ath10k_htt_detach(struct ath10k_htt *htt)
 150{
 151        ath10k_htt_rx_detach(htt);
 152        ath10k_htt_tx_detach(htt);
 153}
 154