/*
* Copyright (c) 2005-2011 Atheros Communications Inc.
* Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "core.h"
#include "hif.h"
#include "debug.h"
/********/
/* Send */
/********/
static inline void ath10k_htc_send_complete_check(struct ath10k_htc_ep *ep,
int force)
{
/*
* Check whether HIF has any prior sends that have finished,
* have not had the post-processing done.
*/
ath10k_hif_send_complete_check(ep->htc->ar, ep->ul_pipe_id, force);
}
static void ath10k_htc_control_tx_complete(struct ath10k *ar,
struct sk_buff *skb)
{
kfree_skb(skb);
}
static struct sk_buff *ath10k_htc_build_tx_ctrl_skb(void *ar)
{
struct sk_buff *skb;
struct ath10k_skb_cb *skb_cb;
skb = dev_alloc_skb(ATH10K_HTC_CONTROL_BUFFER_SIZE);
if (!skb) {
ath10k_warn("Unable to allocate ctrl skb\n");
return NULL;
}
skb_reserve(skb, 20); /* FIXME: why 20 bytes? */
WARN_ONCE((unsigned long)skb->data & 3, "unaligned skb");
skb_cb = ATH10K_SKB_CB(skb);
memset(skb_cb, 0, sizeof(*skb_cb));
ath10k_dbg(ATH10K_DBG_HTC, "%s: skb %p\n", __func__, skb);
return skb;
}
static inline void ath10k_htc_restore_tx_skb(struct ath10k_htc *htc,
struct sk_buff *skb)
{
ath10k_skb_unmap(htc->ar->dev, skb);
skb_pull(skb, sizeof(struct ath10k_htc_hdr));
}
static void ath10k_htc_notify_tx_completion(struct ath10k_htc_ep *ep,
struct sk_buff *skb)
{
ath10k_dbg(ATH10K_DBG_HTC, "%s: ep %d skb %p\n", __func__,
ep->eid, skb);
ath10k_htc_restore_tx_skb(ep->htc, skb);
if (!ep->ep_ops.ep_tx_complete) {
ath10k_warn("no tx handler for eid %d\n", ep->eid);
dev_kfree_skb_any(skb);
return;
}
ep->ep_ops.ep_tx_complete(ep->htc->ar, skb);
}
/* assumes tx_lock is held */
static bool ath10k_htc_ep_need_credit_update(struct ath10k_htc_ep *ep)
{
if (!ep->tx_credit_flow_enabled)
return false;
if (ep->tx_credits >= ep->tx_credits_per_max_message)
return false;
ath10k_dbg(ATH10K_DBG_HTC, "HTC: endpoint %d needs credit update\n",
ep->eid);
return true;
}
static void ath10k_htc_prepare_tx_skb(struct ath10k_htc_ep *ep,
struct sk_buff *skb)
{
struct ath10k_htc_hdr *hdr;
hdr = (struct ath10k_htc_hdr *)skb->data;
memset(hdr, 0, sizeof(*hdr));
hdr->eid = ep->eid;
hdr->len = __cpu_to_le16(skb->len - sizeof(*hdr));
spin_lock_bh(&ep->htc->tx_lock);
hdr->seq_no = ep->seq_no++;
if (ath10k_htc_ep_need_credit_update(ep))
hdr->flags |= ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE;
spin_unlock_bh(&ep->htc->tx_lock);
}
static int ath10k_htc_issue_skb(struct ath10k_htc *htc,
struct ath10k_htc_ep *ep,
struct sk_buff *skb,
u8 credits)
{
struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
int ret;
ath10k_dbg(ATH10K_DBG_HTC, "%s: ep %d skb %p\n", __func__,
ep->eid, skb);
ath10k_htc_prepare_tx_skb(ep, skb);
ret = ath10k_skb_map(htc->ar->dev, skb);
if (ret)
goto err;
ret = ath10k_hif_send_head(htc->ar,
ep->ul_pipe_id,
ep->eid,
skb->len,
skb);
if (unlikely(ret))
goto err;
return 0;
err:
ath10k_warn("HTC issue failed: %d\n", ret);
spin_lock_bh(&htc->tx_lock);
ep->tx_credits += credits;
spin_unlock_bh(&htc->tx_lock);
/* this is the simplest way to handle out-of-resources for non-credit
* based endpoints. credit based endpoints can still get -ENOSR, but
* this is highly unlikely as credit reservation should prevent that */
if (ret == -ENOSR) {
spin_lock_bh(&htc->tx_lock);
__skb_queue_head(&ep->tx_queue, skb);
spin_unlock_bh(&htc->tx_lock);
return ret;
}
skb_cb->is_aborted = true;
ath10k_htc_notify_tx_completion(ep, skb);
return ret;
}
static struct sk_buff *ath10k_htc_get_skb_credit_based(struct ath10k_htc *htc,
struct ath10k_htc_ep *ep,
u8 *credits)
{
struct sk_buff *skb;
struct ath10k_skb_cb *skb_cb;
int credits_required;
int remainder;
unsigned int transfer_len;
lockdep_assert_held(&htc->tx_lock);
skb = __skb_dequeue(&ep->tx_queue);
if (!skb)
return NULL;
skb_cb = ATH10K_SKB_CB(skb);
transfer_len = skb->len;
if (likely(transfer_len <= htc->target_credit_size)) {
credits_required = 1;
} else {
/* figure out how many credits this message requires */
credits_required = transfer_len / htc->target_credit_size;
remainder = transfer_len % htc->target_credit_size;
if (remainder)
credits_required++;
}
ath10k_dbg(ATH10K_DBG_HTC, "Credits required %d got %d\n",
credits_required, ep->tx_credits);
if (ep->tx_credits < credits_required) {
__skb_queue_head(&ep->tx_queue, skb);
return NULL;
}
ep->tx_credits -= credits_required;
*credits = credits_required;
return skb;
}
static void ath10k_htc_send_work(struct work_struct *work)
{
struct ath10k_htc_ep *ep = container_of(work,
struct ath10k_htc_ep, send_work);
struct ath10k_htc *htc = ep->htc;
struct sk_buff *skb;
u8 credits = 0;
int ret;
while (true) {
if (ep->ul_is_polled)
ath10k_htc_send_complete_check(ep, 0);
spin_lock_bh(&htc->tx_lock);
if (ep->tx_credit_flow_enabled)
skb = ath10k_htc_get_skb_credit_based(htc, ep,
&credits);
else
skb = __skb_dequeue(&ep->tx_queue);
spin_unlock_bh(&htc->tx_lock);
if (!skb)
break;
ret = ath10k_htc_issue_skb(htc, ep, skb, credits);
if (ret == -ENOSR)
break;
}
}
int ath10k_htc_send(struct ath10k_htc *htc,
enum ath10k_htc_ep_id eid,
struct sk_buff *skb)
{
struct ath10k_htc_ep *ep = &htc->endpoint[eid];
if (eid >= ATH10K_HTC_EP_COUNT) {
ath10k_warn("Invalid endpoint id: %d\n", eid);
return -ENOENT;
}
skb_push(skb, sizeof(struct ath10k_htc_hdr));
spin_lock_bh(&htc->tx_lock);
__skb_queue_tail(&ep->tx_queue, skb);
spin_unlock_bh(&htc->tx_lock);
queue_work(htc->ar->workqueue, &ep->send_work);
return 0;
}
static int ath10k_htc_tx_completion_handler(struct ath10k *ar,
struct sk_buff *skb,
unsigned int eid)
{
struct ath10k_htc *htc = ar->htc;
struct ath10k_htc_ep *ep = &htc->endpoint[eid];
bool stopping;
ath10k_htc_notify_tx_completion(ep, skb);
/* the skb now belongs to the completion handler */
spin_lock_bh(&htc->tx_lock);
stopping = htc->stopping;
spin_unlock_bh(&htc->tx_lock);
if (!ep->tx_credit_flow_enabled && !stopping)
/*
* note: when using TX credit flow, the re-checking of
* queues happens when credits flow back from the target.
* in the non-TX credit case, we recheck after the packet
* completes
*/
queue_work(ar->workqueue, &ep->send_work);
return 0;
}
/* flush endpoint TX queue */
static void ath10k_htc_flush_endpoint_tx(struct ath10k_htc *htc,
struct ath10k_htc_ep *ep)
{
struct sk_buff *skb;
struct ath10k_skb_cb *skb_cb;
spin_lock_bh(&htc->tx_lock);
for (;;) {
skb = __skb_dequeue(&ep->tx_queue);
if (!skb)
break;
skb_cb = ATH10K_SKB_CB(skb);
skb_cb->is_aborted = true;
ath10k_htc_notify_tx_completion(ep, skb);
}
spin_unlock_bh(&htc->tx_lock);
cancel_work_sync(&ep->send_work);
}
/***********/
/* Receive */
/***********/
static void
ath10k_htc_process_credit_report(struct ath10k_htc *htc,
const struct ath10k_htc_credit_report *report,
int len,
enum ath10k_htc_ep_id eid)
{
struct ath10k_htc_ep *ep;
int i, n_reports;
if (len % sizeof(*report))
ath10k_warn("Uneven credit report len %d", len);
n_reports = len / sizeof(*report);
spin_lock_bh(&htc->tx_lock);
for (i = 0; i < n_reports; i++, report++) {
if (report->eid >= ATH10K_HTC_EP_COUNT)
break;
ath10k_dbg(ATH10K_DBG_HTC, "ep %d got %d credits\n",
report->eid, report->credits);
ep = &htc->endpoint[report->eid];
ep->tx_credits += report->credits;
if (ep->tx_credits && !skb_queue_empty(&ep->tx_queue))
queue_work(htc->ar->workqueue, &ep->send_work);
}
spin_unlock_bh(&htc->tx_lock);
}
static int ath10k_htc_process_trailer(struct ath10k_htc *htc,
u8 *buffer,
int length,
enum ath10k_htc_ep_id src_eid)
{
int status = 0;
struct ath10k_htc_record *record;
u8 *orig_buffer;
int orig_length;
size_t len;
orig_buffer = buffer;
orig_length = length;
while (length > 0) {
record = (struct ath10k_htc_record *)buffer;
if (length < sizeof(record->hdr)) {
status = -EINVAL;
break;
}
if (record->hdr.len > length) {
/* no room left in buffer for record */
ath10k_warn("Invalid record length: %d\n",
record->hdr.len);
status = -EINVAL;
break;
}
switch (record->hdr.id) {
case ATH10K_HTC_RECORD_CREDITS:
len = sizeof(struct ath10k_htc_credit_report);
if (record->hdr.len < len) {
ath10k_warn("Credit report too long\n");
status = -EINVAL;
break;
}
ath10k_htc_process_credit_report(htc,
record->credit_report,
record->hdr.len,
src_eid);
break;
default:
ath10k_warn("Unhandled record: id:%d length:%d\n",
record->hdr.id, record->hdr.len);
break;
}
if (status)
break;
/* multiple records may be present in a trailer */
buffer += sizeof(record->hdr) + record->hdr.len;
length -= sizeof(record->hdr) + record->hdr.len;
}
if (status)
ath10k_dbg_dump(ATH10K_DBG_HTC, "htc rx bad trailer", "",
orig_buffer, orig_length);
return status;
}
static int ath10k_htc_rx_completion_handler(struct ath10k *ar,
struct sk_buff *skb,
u8 pipe_id)
{
int status = 0;
struct ath10k_htc *htc = ar->htc;
struct ath10k_htc_hdr *hdr;
struct ath10k_htc_ep *ep;
u16 payload_len;
u32 trailer_len = 0;
size_t min_len;
u8 eid;
bool trailer_present;
hdr = (struct ath10k_htc_hdr *)skb->data;
skb_pull(skb, sizeof(*hdr));
eid = hdr->eid;
if (eid >= ATH10K_HTC_EP_COUNT) {
ath10k_warn("HTC Rx: invalid eid %d\n", eid);
ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad header", "",
hdr, sizeof(*hdr));
status = -EINVAL;
goto out;
}
ep = &htc->endpoint[eid];
/*
* If this endpoint that received a message from the target has
* a to-target HIF pipe whose send completions are polled rather
* than interrupt-driven, this is a good point to ask HIF to check
* whether it has any completed sends to handle.
*/
if (ep->ul_is_polled)
ath10k_htc_send_complete_check(ep, 1);
payload_len = __le16_to_cpu(hdr->len);
if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) {
ath10k_warn("HTC rx frame too long, len: %zu\n",
payload_len + sizeof(*hdr));
ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad rx pkt len", "",
hdr, sizeof(*hdr));
status = -EINVAL;
goto out;
}
if (skb->len < payload_len) {
ath10k_dbg(ATH10K_DBG_HTC,
"HTC Rx: insufficient length, got %d, expected %d\n",
skb->len, payload_len);
ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad rx pkt len",
"", hdr, sizeof(*hdr));
status = -EINVAL;
goto out;
}
/* get flags to check for trailer */
trailer_present = hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT;
if (trailer_present) {
u8 *trailer;
trailer_len = hdr->trailer_len;
min_len = sizeof(struct ath10k_ath10k_htc_record_hdr);
if ((trailer_len < min_len) ||
(trailer_len > payload_len)) {
ath10k_warn("Invalid trailer length: %d\n",
trailer_len);
status = -EPROTO;
goto out;
}
trailer = (u8 *)hdr;
trailer += sizeof(*hdr);
trailer += payload_len;
trailer -= trailer_len;
status = ath10k_htc_process_trailer(htc, trailer,
trailer_len, hdr->eid);
if (status)
goto out;
skb_trim(skb, skb->len - trailer_len);
}
if (((int)payload_len - (int)trailer_len) <= 0)
/* zero length packet with trailer data, just drop these */
goto out;
if (eid == ATH10K_HTC_EP_0) {
struct ath10k_htc_msg *msg = (struct ath10k_htc_msg *)skb->data;
switch (__le16_to_cpu(msg->hdr.message_id)) {
default:
/* handle HTC control message */
if (completion_done(&htc->ctl_resp)) {
/*
* this is a fatal error, target should not be
* sending unsolicited messages on the ep 0
*/
ath10k_warn("HTC rx ctrl still processing\n");
status = -EINVAL;
complete(&htc->ctl_resp);
goto out;
}
htc->control_resp_len =
min_t(int, skb->len,
ATH10K_HTC_MAX_CTRL_MSG_LEN);
memcpy(htc->control_resp_buffer, skb->data,
htc->control_resp_len);
complete(&htc->ctl_resp);
break;
case ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE:
htc->htc_ops.target_send_suspend_complete(ar);
}
goto out;
}
ath10k_dbg(ATH10K_DBG_HTC, "htc rx completion ep %d skb %p\n",
eid, skb);
ep->ep_ops.ep_rx_complete(ar, skb);
/* skb is now owned by the rx completion handler */
skb = NULL;
out:
kfree_skb(skb);
return status;
}
static void ath10k_htc_control_rx_complete(struct ath10k *ar,
struct sk_buff *skb)
{
/* This is unexpected. FW is not supposed to send regular rx on this
* endpoint. */
ath10k_warn("unexpected htc rx\n");
kfree_skb(skb);
}
/***************/
/* Init/Deinit */
/***************/
static const char *htc_service_name(enum ath10k_htc_svc_id id)
{
switch (id) {
case ATH10K_HTC_SVC_ID_RESERVED:
return "Reserved";
case ATH10K_HTC_SVC_ID_RSVD_CTRL:
return "Control";
case ATH10K_HTC_SVC_ID_WMI_CONTROL:
return "WMI";
case ATH10K_HTC_SVC_ID_WMI_DATA_BE:
return "DATA BE";
case ATH10K_HTC_SVC_ID_WMI_DATA_BK:
return "DATA BK";
case ATH10K_HTC_SVC_ID_WMI_DATA_VI:
return "DATA VI";
case ATH10K_HTC_SVC_ID_WMI_DATA_VO:
return "DATA VO";
case ATH10K_HTC_SVC_ID_NMI_CONTROL:
return "NMI Control";
case ATH10K_HTC_SVC_ID_NMI_DATA:
return "NMI Data";
case ATH10K_HTC_SVC_ID_HTT_DATA_MSG:
return "HTT Data";
case ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS:
return "RAW";
}
return "Unknown";
}
static void ath10k_htc_reset_endpoint_states(struct ath10k_htc *htc)
{
struct ath10k_htc_ep *ep;
int i;
for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {
ep = &htc->endpoint[i];
ep->service_id = ATH10K_HTC_SVC_ID_UNUSED;
ep->max_ep_message_len = 0;
ep->max_tx_queue_depth = 0;
ep->eid = i;
skb_queue_head_init(&ep->tx_queue);
ep->htc = htc;
ep->tx_credit_flow_enabled = true;
INIT_WORK(&ep->send_work, ath10k_htc_send_work);
}
}
static void ath10k_htc_setup_target_buffer_assignments(struct ath10k_htc *htc)
{
struct ath10k_htc_svc_tx_credits *entry;
entry = &htc->service_tx_alloc[0];
/*
* for PCIE allocate all credists/HTC buffers to WMI.
* no buffers are used/required for data. data always
* remains on host.
*/
entry++;
entry->service_id = ATH10K_HTC_SVC_ID_WMI_CONTROL;
entry->credit_allocation = htc->total_transmit_credits;
}
static u8 ath10k_htc_get_credit_allocation(struct ath10k_htc *htc,
u16 service_id)
{
u8 allocation = 0;
int i;
for (i = 0; i < ATH10K_HTC_EP_COUNT; i++) {
if (htc->service_tx_alloc[i].service_id == service_id)
allocation =
htc->service_tx_alloc[i].credit_allocation;
}
return allocation;
}
int ath10k_htc_wait_target(struct ath10k_htc *htc)
{
int status = 0;
struct ath10k_htc_svc_conn_req conn_req;
struct ath10k_htc_svc_conn_resp conn_resp;
struct ath10k_htc_msg *msg;
u16 message_id;
u16 credit_count;
u16 credit_size;
INIT_COMPLETION(htc->ctl_resp);
status = ath10k_hif_start(htc->ar);
if (status) {
ath10k_err("could not start HIF (%d)\n", status);
goto err_start;
}
status = wait_for_completion_timeout(&htc->ctl_resp,
ATH10K_HTC_WAIT_TIMEOUT_HZ);
if (status <= 0) {
if (status == 0)
status = -ETIMEDOUT;
ath10k_err("ctl_resp never came in (%d)\n", status);
goto err_target;
}
if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) {
ath10k_err("Invalid HTC ready msg len:%d\n",
htc->control_resp_len);
status = -ECOMM;
goto err_target;
}
msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
message_id = __le16_to_cpu(msg->hdr.message_id);
credit_count = __le16_to_cpu(msg->ready.credit_count);
credit_size = __le16_to_cpu(msg->ready.credit_size);
if (message_id != ATH10K_HTC_MSG_READY_ID) {
ath10k_err("Invalid HTC ready msg: 0x%x\n", message_id);
status = -ECOMM;
goto err_target;
}
htc->total_transmit_credits = credit_count;
htc->target_credit_size = credit_size;
ath10k_dbg(ATH10K_DBG_HTC,
"Target ready! transmit resources: %d size:%d\n",
htc->total_transmit_credits,
htc->target_credit_size);
if ((htc->total_transmit_credits == 0) ||
(htc->target_credit_size == 0)) {
status = -ECOMM;
ath10k_err("Invalid credit size received\n");
goto err_target;
}
ath10k_htc_setup_target_buffer_assignments(htc);
/* setup our pseudo HTC control endpoint connection */
memset(&conn_req, 0, sizeof(conn_req));
memset(&conn_resp, 0, sizeof(conn_resp));
conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete;
conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete;
conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS;
conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL;
/* connect fake service */
status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp);
if (status) {
ath10k_err("could not connect to htc service (%d)\n", status);
goto err_target;
}
return 0;
err_target:
ath10k_hif_stop(htc->ar);
err_start:
return status;
}
int ath10k_htc_connect_service(struct ath10k_htc *htc,
struct ath10k_htc_svc_conn_req *conn_req,
struct ath10k_htc_svc_conn_resp *conn_resp)
{
struct ath10k_htc_msg *msg;
struct ath10k_htc_conn_svc *req_msg;
struct ath10k_htc_conn_svc_response resp_msg_dummy;
struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy;
enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT;
struct ath10k_htc_ep *ep;
struct sk_buff *skb;
unsigned int max_msg_size = 0;
int length, status;
bool disable_credit_flow_ctrl = false;
u16 message_id, service_id, flags = 0;
u8 tx_alloc = 0;
/* special case for HTC pseudo control service */
if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) {
disable_credit_flow_ctrl = true;
assigned_eid = ATH10K_HTC_EP_0;
max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN;
memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
goto setup;
}
tx_alloc = ath10k_htc_get_credit_allocation(htc,
conn_req->service_id);
if (!tx_alloc)
ath10k_warn("HTC Service %s does not allocate target credits\n",
htc_service_name(conn_req->service_id));
skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
if (!skb) {
ath10k_err("Failed to allocate HTC packet\n");
return -ENOMEM;
}
length = sizeof(msg->hdr) + sizeof(msg->connect_service);
skb_put(skb, length);
memset(skb->data, 0, length);
msg = (struct ath10k_htc_msg *)skb->data;
msg->hdr.message_id =
__cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID);
flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC);
req_msg = &msg->connect_service;
req_msg->flags = __cpu_to_le16(flags);
req_msg->service_id = __cpu_to_le16(conn_req->service_id);
/* Only enable credit flow control for WMI ctrl service */
if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) {
flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
disable_credit_flow_ctrl = true;
}
INIT_COMPLETION(htc->ctl_resp);
status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
if (status) {
kfree_skb(skb);
return status;
}
/* wait for response */
status = wait_for_completion_timeout(&htc->ctl_resp,
ATH10K_HTC_CONN_SVC_TIMEOUT_HZ);
if (status <= 0) {
if (status == 0)
status = -ETIMEDOUT;
ath10k_err("Service connect timeout: %d\n", status);
return status;
}
/* we controlled the buffer creation, it's aligned */
msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
resp_msg = &msg->connect_service_response;
message_id = __le16_to_cpu(msg->hdr.message_id);
service_id = __le16_to_cpu(resp_msg->service_id);
if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
(htc->control_resp_len < sizeof(msg->hdr) +
sizeof(msg->connect_service_response))) {
ath10k_err("Invalid resp message ID 0x%x", message_id);
return -EPROTO;
}
ath10k_dbg(ATH10K_DBG_HTC,
"HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n",
htc_service_name(service_id),
resp_msg->status, resp_msg->eid);
conn_resp->connect_resp_code = resp_msg->status;
/* check response status */
if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) {
ath10k_err("HTC Service %s connect request failed: 0x%x)\n",
htc_service_name(service_id),
resp_msg->status);
return -EPROTO;
}
assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid;
max_msg_size = __le16_to_cpu(resp_msg->max_msg_size);
setup:
if (assigned_eid >= ATH10K_HTC_EP_COUNT)
return -EPROTO;
if (max_msg_size == 0)
return -EPROTO;
ep = &htc->endpoint[assigned_eid];
ep->eid = assigned_eid;
if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED)
return -EPROTO;
/* return assigned endpoint to caller */
conn_resp->eid = assigned_eid;
conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size);
/* setup the endpoint */
ep->service_id = conn_req->service_id;
ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size);
ep->tx_credits = tx_alloc;
ep->tx_credit_size = htc->target_credit_size;
ep->tx_credits_per_max_message = ep->max_ep_message_len /
htc->target_credit_size;
if (ep->max_ep_message_len % htc->target_credit_size)
ep->tx_credits_per_max_message++;
/* copy all the callbacks */
ep->ep_ops = conn_req->ep_ops;
status = ath10k_hif_map_service_to_pipe(htc->ar,
ep->service_id,
&ep->ul_pipe_id,
&ep->dl_pipe_id,
&ep->ul_is_polled,
&ep->dl_is_polled);
if (status)
return status;
ath10k_dbg(ATH10K_DBG_HTC,
"HTC service: %s UL pipe: %d DL pipe: %d eid: %d ready\n",
htc_service_name(ep->service_id), ep->ul_pipe_id,
ep->dl_pipe_id, ep->eid);
ath10k_dbg(ATH10K_DBG_HTC,
"EP %d UL polled: %d, DL polled: %d\n",
ep->eid, ep->ul_is_polled, ep->dl_is_polled);
if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
ep->tx_credit_flow_enabled = false;
ath10k_dbg(ATH10K_DBG_HTC,
"HTC service: %s eid: %d TX flow control disabled\n",
htc_service_name(ep->service_id), assigned_eid);
}
return status;
}
struct sk_buff *ath10k_htc_alloc_skb(int size)
{
struct sk_buff *skb;
skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr));
if (!skb) {
ath10k_warn("could not allocate HTC tx skb\n");
return NULL;
}
skb_reserve(skb, sizeof(struct ath10k_htc_hdr));
/* FW/HTC requires 4-byte aligned streams */
if (!IS_ALIGNED((unsigned long)skb->data, 4))
ath10k_warn("Unaligned HTC tx skb\n");
return skb;
}
int ath10k_htc_start(struct ath10k_htc *htc)
{
struct sk_buff *skb;
int status = 0;
struct ath10k_htc_msg *msg;
skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
if (!skb)
return -ENOMEM;
skb_put(skb, sizeof(msg->hdr) + sizeof(msg->setup_complete_ext));
memset(skb->data, 0, skb->len);
msg = (struct ath10k_htc_msg *)skb->data;
msg->hdr.message_id =
__cpu_to_le16(ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID);
ath10k_dbg(ATH10K_DBG_HTC, "HTC is using TX credit flow control\n");
status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
if (status) {
kfree_skb(skb);
return status;
}
return 0;
}
/*
* stop HTC communications, i.e. stop interrupt reception, and flush all
* queued buffers
*/
void ath10k_htc_stop(struct ath10k_htc *htc)
{
int i;
struct ath10k_htc_ep *ep;
spin_lock_bh(&htc->tx_lock);
htc->stopping = true;
spin_unlock_bh(&htc->tx_lock);
for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {
ep = &htc->endpoint[i];
ath10k_htc_flush_endpoint_tx(htc, ep);
}
ath10k_hif_stop(htc->ar);
ath10k_htc_reset_endpoint_states(htc);
}
/* registered target arrival callback from the HIF layer */
struct ath10k_htc *ath10k_htc_create(struct ath10k *ar,
struct ath10k_htc_ops *htc_ops)
{
struct ath10k_hif_cb htc_callbacks;
struct ath10k_htc_ep *ep = NULL;
struct ath10k_htc *htc = NULL;
/* FIXME: use struct ath10k instead */
htc = kzalloc(sizeof(struct ath10k_htc), GFP_KERNEL);
if (!htc)
return ERR_PTR(-ENOMEM);
spin_lock_init(&htc->tx_lock);
memcpy(&htc->htc_ops, htc_ops, sizeof(struct ath10k_htc_ops));
ath10k_htc_reset_endpoint_states(htc);
/* setup HIF layer callbacks */
htc_callbacks.rx_completion = ath10k_htc_rx_completion_handler;
htc_callbacks.tx_completion = ath10k_htc_tx_completion_handler;
htc->ar = ar;
/* Get HIF default pipe for HTC message exchange */
ep = &htc->endpoint[ATH10K_HTC_EP_0];
ath10k_hif_init(ar, &htc_callbacks);
ath10k_hif_get_default_pipe(ar, &ep->ul_pipe_id, &ep->dl_pipe_id);
init_completion(&htc->ctl_resp);
return htc;
}
void ath10k_htc_destroy(struct ath10k_htc *htc)
{
kfree(htc);
}