rsi: add coex support

With BT support, driver has to handle two streams of data
(i.e. wlan and BT). Actual coex implementation is in firmware.
Coex module just schedule the packets to firmware by taking them
from the corresponding paths.

Structures for module and protocol operations are introduced for
this purpose. Protocol operations structure is global structure
which can be shared among different modules. Move initialization
of coex and operating mode values to rsi_91x_init().

Signed-off-by: Prameela Rani Garnepudi <prameela.j04cs@gmail.com>
Signed-off-by: Siva Rebbagondla <siva.rebbagondla@redpinesignals.com>
Signed-off-by: Amitkumar Karwar <amit.karwar@redpinesignals.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 177 insertions, 0 deletions

diff --git a/drivers/net/wireless/rsi/rsi_91x_coex.c b/drivers/net/wireless/rsi/rsi_91x_coex.c
new file mode 100644
index 000000000000..c07e839017ea
--- /dev/null
+++ b/drivers/net/wireless/rsi/rsi_91x_coex.c
@@ -0,0 +1,177 @@
+/**
+ * Copyright (c) 2018 Redpine Signals 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 "rsi_main.h"
+#include "rsi_coex.h"
+#include "rsi_mgmt.h"
+#include "rsi_hal.h"
+
+static enum rsi_coex_queues rsi_coex_determine_coex_q
+			(struct rsi_coex_ctrl_block *coex_cb)
+{
+	enum rsi_coex_queues q_num = RSI_COEX_Q_INVALID;
+
+	if (skb_queue_len(&coex_cb->coex_tx_qs[RSI_COEX_Q_COMMON]) > 0)
+		q_num = RSI_COEX_Q_COMMON;
+	if (skb_queue_len(&coex_cb->coex_tx_qs[RSI_COEX_Q_BT]) > 0)
+		q_num = RSI_COEX_Q_BT;
+	if (skb_queue_len(&coex_cb->coex_tx_qs[RSI_COEX_Q_WLAN]) > 0)
+		q_num = RSI_COEX_Q_WLAN;
+
+	return q_num;
+}
+
+static void rsi_coex_sched_tx_pkts(struct rsi_coex_ctrl_block *coex_cb)
+{
+	enum rsi_coex_queues coex_q = RSI_COEX_Q_INVALID;
+	struct sk_buff *skb;
+
+	do {
+		coex_q = rsi_coex_determine_coex_q(coex_cb);
+		rsi_dbg(INFO_ZONE, "queue = %d\n", coex_q);
+
+		if (coex_q == RSI_COEX_Q_BT)
+			skb = skb_dequeue(&coex_cb->coex_tx_qs[RSI_COEX_Q_BT]);
+	} while (coex_q != RSI_COEX_Q_INVALID);
+}
+
+static void rsi_coex_scheduler_thread(struct rsi_common *common)
+{
+	struct rsi_coex_ctrl_block *coex_cb =
+		(struct rsi_coex_ctrl_block *)common->coex_cb;
+	u32 timeout = EVENT_WAIT_FOREVER;
+
+	do {
+		rsi_wait_event(&coex_cb->coex_tx_thread.event, timeout);
+		rsi_reset_event(&coex_cb->coex_tx_thread.event);
+
+		rsi_coex_sched_tx_pkts(coex_cb);
+	} while (atomic_read(&coex_cb->coex_tx_thread.thread_done) == 0);
+
+	complete_and_exit(&coex_cb->coex_tx_thread.completion, 0);
+}
+
+int rsi_coex_recv_pkt(struct rsi_common *common, u8 *msg)
+{
+	u8 msg_type = msg[RSI_RX_DESC_MSG_TYPE_OFFSET];
+
+	switch (msg_type) {
+	case COMMON_CARD_READY_IND:
+		rsi_dbg(INFO_ZONE, "common card ready received\n");
+		rsi_handle_card_ready(common, msg);
+		break;
+	case SLEEP_NOTIFY_IND:
+		rsi_dbg(INFO_ZONE, "sleep notify received\n");
+		rsi_mgmt_pkt_recv(common, msg);
+		break;
+	}
+
+	return 0;
+}
+
+static inline int rsi_map_coex_q(u8 hal_queue)
+{
+	switch (hal_queue) {
+	case RSI_COEX_Q:
+		return RSI_COEX_Q_COMMON;
+	case RSI_WLAN_Q:
+		return RSI_COEX_Q_WLAN;
+	case RSI_BT_Q:
+		return RSI_COEX_Q_BT;
+	}
+	return RSI_COEX_Q_INVALID;
+}
+
+int rsi_coex_send_pkt(void *priv, struct sk_buff *skb, u8 hal_queue)
+{
+	struct rsi_common *common = (struct rsi_common *)priv;
+	struct rsi_coex_ctrl_block *coex_cb =
+		(struct rsi_coex_ctrl_block *)common->coex_cb;
+	struct skb_info *tx_params = NULL;
+	enum rsi_coex_queues coex_q;
+	int status;
+
+	coex_q = rsi_map_coex_q(hal_queue);
+	if (coex_q == RSI_COEX_Q_INVALID) {
+		rsi_dbg(ERR_ZONE, "Invalid coex queue\n");
+		return -EINVAL;
+	}
+	if (coex_q != RSI_COEX_Q_COMMON &&
+	    coex_q != RSI_COEX_Q_WLAN) {
+		skb_queue_tail(&coex_cb->coex_tx_qs[coex_q], skb);
+		rsi_set_event(&coex_cb->coex_tx_thread.event);
+		return 0;
+	}
+	if (common->iface_down) {
+		tx_params =
+			(struct skb_info *)&IEEE80211_SKB_CB(skb)->driver_data;
+
+		if (!(tx_params->flags & INTERNAL_MGMT_PKT)) {
+			rsi_indicate_tx_status(common->priv, skb, -EINVAL);
+			return 0;
+		}
+	}
+
+	/* Send packet to hal */
+	if (skb->priority == MGMT_SOFT_Q)
+		status = rsi_send_mgmt_pkt(common, skb);
+	else
+		status = rsi_send_data_pkt(common, skb);
+
+	return status;
+}
+
+int rsi_coex_attach(struct rsi_common *common)
+{
+	struct rsi_coex_ctrl_block *coex_cb;
+	int cnt;
+
+	coex_cb = kzalloc(sizeof(*coex_cb), GFP_KERNEL);
+	if (!coex_cb)
+		return -ENOMEM;
+
+	common->coex_cb = (void *)coex_cb;
+	coex_cb->priv = common;
+
+	/* Initialize co-ex queues */
+	for (cnt = 0; cnt < NUM_COEX_TX_QUEUES; cnt++)
+		skb_queue_head_init(&coex_cb->coex_tx_qs[cnt]);
+	rsi_init_event(&coex_cb->coex_tx_thread.event);
+
+	/* Initialize co-ex thread */
+	if (rsi_create_kthread(common,
+			       &coex_cb->coex_tx_thread,
+			       rsi_coex_scheduler_thread,
+			       "Coex-Tx-Thread")) {
+		rsi_dbg(ERR_ZONE, "%s: Unable to init tx thrd\n", __func__);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+void rsi_coex_detach(struct rsi_common *common)
+{
+	struct rsi_coex_ctrl_block *coex_cb =
+		(struct rsi_coex_ctrl_block *)common->coex_cb;
+	int cnt;
+
+	rsi_kill_thread(&coex_cb->coex_tx_thread);
+
+	for (cnt = 0; cnt < NUM_COEX_TX_QUEUES; cnt++)
+		skb_queue_purge(&coex_cb->coex_tx_qs[cnt]);
+
+	kfree(coex_cb);
+}