370 lines
9.3 KiB
C
370 lines
9.3 KiB
C
/*
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* Copyright (c) 2010-2011 Atheros Communications Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "htc.h"
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static const char *wmi_cmd_to_name(enum wmi_cmd_id wmi_cmd)
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{
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switch (wmi_cmd) {
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case WMI_ECHO_CMDID:
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return "WMI_ECHO_CMDID";
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case WMI_ACCESS_MEMORY_CMDID:
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return "WMI_ACCESS_MEMORY_CMDID";
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case WMI_GET_FW_VERSION:
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return "WMI_GET_FW_VERSION";
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case WMI_DISABLE_INTR_CMDID:
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return "WMI_DISABLE_INTR_CMDID";
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case WMI_ENABLE_INTR_CMDID:
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return "WMI_ENABLE_INTR_CMDID";
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case WMI_ATH_INIT_CMDID:
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return "WMI_ATH_INIT_CMDID";
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case WMI_ABORT_TXQ_CMDID:
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return "WMI_ABORT_TXQ_CMDID";
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case WMI_STOP_TX_DMA_CMDID:
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return "WMI_STOP_TX_DMA_CMDID";
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case WMI_ABORT_TX_DMA_CMDID:
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return "WMI_ABORT_TX_DMA_CMDID";
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case WMI_DRAIN_TXQ_CMDID:
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return "WMI_DRAIN_TXQ_CMDID";
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case WMI_DRAIN_TXQ_ALL_CMDID:
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return "WMI_DRAIN_TXQ_ALL_CMDID";
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case WMI_START_RECV_CMDID:
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return "WMI_START_RECV_CMDID";
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case WMI_STOP_RECV_CMDID:
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return "WMI_STOP_RECV_CMDID";
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case WMI_FLUSH_RECV_CMDID:
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return "WMI_FLUSH_RECV_CMDID";
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case WMI_SET_MODE_CMDID:
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return "WMI_SET_MODE_CMDID";
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case WMI_NODE_CREATE_CMDID:
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return "WMI_NODE_CREATE_CMDID";
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case WMI_NODE_REMOVE_CMDID:
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return "WMI_NODE_REMOVE_CMDID";
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case WMI_VAP_REMOVE_CMDID:
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return "WMI_VAP_REMOVE_CMDID";
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case WMI_VAP_CREATE_CMDID:
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return "WMI_VAP_CREATE_CMDID";
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case WMI_REG_READ_CMDID:
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return "WMI_REG_READ_CMDID";
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case WMI_REG_WRITE_CMDID:
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return "WMI_REG_WRITE_CMDID";
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case WMI_REG_RMW_CMDID:
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return "WMI_REG_RMW_CMDID";
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case WMI_RC_STATE_CHANGE_CMDID:
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return "WMI_RC_STATE_CHANGE_CMDID";
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case WMI_RC_RATE_UPDATE_CMDID:
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return "WMI_RC_RATE_UPDATE_CMDID";
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case WMI_TARGET_IC_UPDATE_CMDID:
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return "WMI_TARGET_IC_UPDATE_CMDID";
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case WMI_TX_AGGR_ENABLE_CMDID:
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return "WMI_TX_AGGR_ENABLE_CMDID";
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case WMI_TGT_DETACH_CMDID:
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return "WMI_TGT_DETACH_CMDID";
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case WMI_NODE_UPDATE_CMDID:
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return "WMI_NODE_UPDATE_CMDID";
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case WMI_INT_STATS_CMDID:
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return "WMI_INT_STATS_CMDID";
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case WMI_TX_STATS_CMDID:
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return "WMI_TX_STATS_CMDID";
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case WMI_RX_STATS_CMDID:
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return "WMI_RX_STATS_CMDID";
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case WMI_BITRATE_MASK_CMDID:
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return "WMI_BITRATE_MASK_CMDID";
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}
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return "Bogus";
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}
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struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv)
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{
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struct wmi *wmi;
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wmi = kzalloc(sizeof(struct wmi), GFP_KERNEL);
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if (!wmi)
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return NULL;
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wmi->drv_priv = priv;
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wmi->stopped = false;
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skb_queue_head_init(&wmi->wmi_event_queue);
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spin_lock_init(&wmi->wmi_lock);
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spin_lock_init(&wmi->event_lock);
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mutex_init(&wmi->op_mutex);
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mutex_init(&wmi->multi_write_mutex);
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mutex_init(&wmi->multi_rmw_mutex);
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init_completion(&wmi->cmd_wait);
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INIT_LIST_HEAD(&wmi->pending_tx_events);
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tasklet_setup(&wmi->wmi_event_tasklet, ath9k_wmi_event_tasklet);
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return wmi;
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}
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void ath9k_stop_wmi(struct ath9k_htc_priv *priv)
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{
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struct wmi *wmi = priv->wmi;
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mutex_lock(&wmi->op_mutex);
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wmi->stopped = true;
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mutex_unlock(&wmi->op_mutex);
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}
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void ath9k_destroy_wmi(struct ath9k_htc_priv *priv)
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{
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kfree(priv->wmi);
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}
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void ath9k_wmi_event_drain(struct ath9k_htc_priv *priv)
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{
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unsigned long flags;
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tasklet_kill(&priv->wmi->wmi_event_tasklet);
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spin_lock_irqsave(&priv->wmi->wmi_lock, flags);
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__skb_queue_purge(&priv->wmi->wmi_event_queue);
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spin_unlock_irqrestore(&priv->wmi->wmi_lock, flags);
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}
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void ath9k_wmi_event_tasklet(struct tasklet_struct *t)
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{
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struct wmi *wmi = from_tasklet(wmi, t, wmi_event_tasklet);
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struct ath9k_htc_priv *priv = wmi->drv_priv;
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struct wmi_cmd_hdr *hdr;
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void *wmi_event;
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struct wmi_event_swba *swba;
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struct sk_buff *skb = NULL;
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unsigned long flags;
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u16 cmd_id;
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do {
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spin_lock_irqsave(&wmi->wmi_lock, flags);
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skb = __skb_dequeue(&wmi->wmi_event_queue);
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if (!skb) {
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spin_unlock_irqrestore(&wmi->wmi_lock, flags);
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return;
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}
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spin_unlock_irqrestore(&wmi->wmi_lock, flags);
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/* Check if ath9k_htc_probe_device() completed. */
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if (!data_race(priv->initialized)) {
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kfree_skb(skb);
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continue;
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}
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hdr = (struct wmi_cmd_hdr *) skb->data;
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cmd_id = be16_to_cpu(hdr->command_id);
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wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));
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switch (cmd_id) {
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case WMI_SWBA_EVENTID:
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swba = wmi_event;
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ath9k_htc_swba(priv, swba);
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break;
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case WMI_FATAL_EVENTID:
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ieee80211_queue_work(wmi->drv_priv->hw,
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&wmi->drv_priv->fatal_work);
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break;
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case WMI_TXSTATUS_EVENTID:
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spin_lock_bh(&priv->tx.tx_lock);
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if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
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spin_unlock_bh(&priv->tx.tx_lock);
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break;
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}
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spin_unlock_bh(&priv->tx.tx_lock);
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ath9k_htc_txstatus(priv, wmi_event);
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break;
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default:
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break;
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}
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kfree_skb(skb);
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} while (1);
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}
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void ath9k_fatal_work(struct work_struct *work)
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{
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struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
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fatal_work);
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struct ath_common *common = ath9k_hw_common(priv->ah);
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ath_dbg(common, FATAL, "FATAL Event received, resetting device\n");
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ath9k_htc_reset(priv);
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}
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static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
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{
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skb_pull(skb, sizeof(struct wmi_cmd_hdr));
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if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
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memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);
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complete(&wmi->cmd_wait);
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}
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static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
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enum htc_endpoint_id epid)
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{
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struct wmi *wmi = priv;
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struct wmi_cmd_hdr *hdr;
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unsigned long flags;
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u16 cmd_id;
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if (unlikely(wmi->stopped))
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goto free_skb;
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/* Validate the obtained SKB. */
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if (unlikely(skb->len < sizeof(struct wmi_cmd_hdr)))
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goto free_skb;
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hdr = (struct wmi_cmd_hdr *) skb->data;
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cmd_id = be16_to_cpu(hdr->command_id);
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if (cmd_id & 0x1000) {
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spin_lock_irqsave(&wmi->wmi_lock, flags);
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__skb_queue_tail(&wmi->wmi_event_queue, skb);
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spin_unlock_irqrestore(&wmi->wmi_lock, flags);
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tasklet_schedule(&wmi->wmi_event_tasklet);
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return;
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}
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/* Check if there has been a timeout. */
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spin_lock_irqsave(&wmi->wmi_lock, flags);
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if (be16_to_cpu(hdr->seq_no) != wmi->last_seq_id) {
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spin_unlock_irqrestore(&wmi->wmi_lock, flags);
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goto free_skb;
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}
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/* WMI command response */
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ath9k_wmi_rsp_callback(wmi, skb);
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spin_unlock_irqrestore(&wmi->wmi_lock, flags);
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free_skb:
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kfree_skb(skb);
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}
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static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,
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enum htc_endpoint_id epid, bool txok)
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{
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kfree_skb(skb);
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}
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int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi,
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enum htc_endpoint_id *wmi_ctrl_epid)
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{
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struct htc_service_connreq connect;
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int ret;
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wmi->htc = htc;
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memset(&connect, 0, sizeof(connect));
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connect.ep_callbacks.priv = wmi;
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connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;
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connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;
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connect.service_id = WMI_CONTROL_SVC;
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ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);
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if (ret)
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return ret;
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*wmi_ctrl_epid = wmi->ctrl_epid;
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return 0;
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}
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static int ath9k_wmi_cmd_issue(struct wmi *wmi,
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struct sk_buff *skb,
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enum wmi_cmd_id cmd, u16 len,
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u8 *rsp_buf, u32 rsp_len)
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{
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struct wmi_cmd_hdr *hdr;
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unsigned long flags;
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hdr = skb_push(skb, sizeof(struct wmi_cmd_hdr));
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hdr->command_id = cpu_to_be16(cmd);
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hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);
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spin_lock_irqsave(&wmi->wmi_lock, flags);
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/* record the rsp buffer and length */
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wmi->cmd_rsp_buf = rsp_buf;
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wmi->cmd_rsp_len = rsp_len;
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wmi->last_seq_id = wmi->tx_seq_id;
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spin_unlock_irqrestore(&wmi->wmi_lock, flags);
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return htc_send_epid(wmi->htc, skb, wmi->ctrl_epid);
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}
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int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
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u8 *cmd_buf, u32 cmd_len,
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u8 *rsp_buf, u32 rsp_len,
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u32 timeout)
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{
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struct ath_hw *ah = wmi->drv_priv->ah;
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struct ath_common *common = ath9k_hw_common(ah);
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u16 headroom = sizeof(struct htc_frame_hdr) +
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sizeof(struct wmi_cmd_hdr);
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unsigned long time_left, flags;
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struct sk_buff *skb;
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int ret = 0;
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if (ah->ah_flags & AH_UNPLUGGED)
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return 0;
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skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
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if (!skb)
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return -ENOMEM;
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skb_reserve(skb, headroom);
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if (cmd_len != 0 && cmd_buf != NULL) {
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skb_put_data(skb, cmd_buf, cmd_len);
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}
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mutex_lock(&wmi->op_mutex);
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/* check if wmi stopped flag is set */
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if (unlikely(wmi->stopped)) {
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ret = -EPROTO;
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goto out;
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}
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ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len, rsp_buf, rsp_len);
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if (ret)
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goto out;
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time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
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if (!time_left) {
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ath_dbg(common, WMI, "Timeout waiting for WMI command: %s\n",
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wmi_cmd_to_name(cmd_id));
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spin_lock_irqsave(&wmi->wmi_lock, flags);
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wmi->last_seq_id = 0;
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spin_unlock_irqrestore(&wmi->wmi_lock, flags);
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mutex_unlock(&wmi->op_mutex);
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return -ETIMEDOUT;
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}
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mutex_unlock(&wmi->op_mutex);
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return 0;
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out:
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ath_dbg(common, WMI, "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
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mutex_unlock(&wmi->op_mutex);
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kfree_skb(skb);
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return ret;
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}
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