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_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
120int 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
144void ath10k_htt_detach(struct ath10k_htt *htt)
145{
146	ath10k_htt_rx_detach(htt);
147	ath10k_htt_tx_detach(htt);
148}