mwifiex: add support for Marvell USB8797 chipset

This patch supports Avastar 88W8797 chipset with USB interface.

The corresponding firmware image file is located at:
"mrvl/usb8797_uapsta.bin"

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Kiran Divekar <dkiran@marvell.com>
Signed-off-by: Frank Huang <frankh@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwifiex/11n_aggr.c

@@ -233,21 +233,27 @@ mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
 
 	skb_push(skb_aggr, headroom);
 
-	/*
-	 * Padding per MSDU will affect the length of next
-	 * packet and hence the exact length of next packet
-	 * is uncertain here.
-	 *
-	 * Also, aggregation of transmission buffer, while
-	 * downloading the data to the card, wont gain much
-	 * on the AMSDU packets as the AMSDU packets utilizes
-	 * the transmission buffer space to the maximum
-	 * (adapter->tx_buf_size).
-	 */
-	tx_param.next_pkt_len = 0;
-
-	ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
-					   skb_aggr, &tx_param);
+	if (adapter->iface_type == MWIFIEX_USB) {
+		adapter->data_sent = true;
+		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
+						   skb_aggr, NULL);
+	} else {
+		/*
+		 * Padding per MSDU will affect the length of next
+		 * packet and hence the exact length of next packet
+		 * is uncertain here.
+		 *
+		 * Also, aggregation of transmission buffer, while
+		 * downloading the data to the card, wont gain much
+		 * on the AMSDU packets as the AMSDU packets utilizes
+		 * the transmission buffer space to the maximum
+		 * (adapter->tx_buf_size).
+		 */
+		tx_param.next_pkt_len = 0;
+
+		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
+						   skb_aggr, &tx_param);
+	}
 	switch (ret) {
 	case -EBUSY:
 		spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);

drivers/net/wireless/mwifiex/Kconfig

@@ -30,3 +30,14 @@ config MWIFIEX_PCIE
 
 	  If you choose to build it as a module, it will be called
 	  mwifiex_pcie.
+
+config MWIFIEX_USB
+	tristate "Marvell WiFi-Ex Driver for USB8797"
+	depends on MWIFIEX && USB
+	select FW_LOADER
+	---help---
+	  This adds support for wireless adapters based on Marvell
+	  Avastar 88W8797 chipset with USB interface.
+
+	  If you choose to build it as a module, it will be called
+	  mwifiex_usb.

drivers/net/wireless/mwifiex/Makefile

@@ -42,3 +42,6 @@ obj-$(CONFIG_MWIFIEX_SDIO) += mwifiex_sdio.o
 
 mwifiex_pcie-y += pcie.o
 obj-$(CONFIG_MWIFIEX_PCIE) += mwifiex_pcie.o
+
+mwifiex_usb-y += usb.o
+obj-$(CONFIG_MWIFIEX_USB) += mwifiex_usb.o

drivers/net/wireless/mwifiex/cmdevt.c

@@ -139,6 +139,7 @@ static int mwifiex_dnld_cmd_to_fw(struct mwifiex_private *priv,
 	uint16_t cmd_size;
 	struct timeval tstamp;
 	unsigned long flags;
+	__le32 tmp;
 
 	if (!adapter || !cmd_node)
 		return -1;
@@ -178,15 +179,28 @@ static int mwifiex_dnld_cmd_to_fw(struct mwifiex_private *priv,
 		le16_to_cpu(*(__le16 *) ((u8 *) host_cmd + S_DS_GEN)), cmd_size,
 		le16_to_cpu(host_cmd->seq_num));
 
-	skb_push(cmd_node->cmd_skb, INTF_HEADER_LEN);
-
-	ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_CMD,
-					   cmd_node->cmd_skb, NULL);
-
-	skb_pull(cmd_node->cmd_skb, INTF_HEADER_LEN);
+	if (adapter->iface_type == MWIFIEX_USB) {
+		tmp = cpu_to_le32(MWIFIEX_USB_TYPE_CMD);
+		skb_push(cmd_node->cmd_skb, MWIFIEX_TYPE_LEN);
+		memcpy(cmd_node->cmd_skb->data, &tmp, MWIFIEX_TYPE_LEN);
+		adapter->cmd_sent = true;
+		ret = adapter->if_ops.host_to_card(adapter,
+						   MWIFIEX_USB_EP_CMD_EVENT,
+						   cmd_node->cmd_skb, NULL);
+		skb_pull(cmd_node->cmd_skb, MWIFIEX_TYPE_LEN);
+		if (ret == -EBUSY)
+			cmd_node->cmd_skb = NULL;
+	} else {
+		skb_push(cmd_node->cmd_skb, INTF_HEADER_LEN);
+		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_CMD,
+						   cmd_node->cmd_skb, NULL);
+		skb_pull(cmd_node->cmd_skb, INTF_HEADER_LEN);
+	}
 
 	if (ret == -1) {
 		dev_err(adapter->dev, "DNLD_CMD: host to card failed\n");
+		if (adapter->iface_type == MWIFIEX_USB)
+			adapter->cmd_sent = false;
 		if (cmd_node->wait_q_enabled)
 			adapter->cmd_wait_q.status = -1;
 		mwifiex_insert_cmd_to_free_q(adapter, adapter->curr_cmd);
@@ -232,6 +246,9 @@ static int mwifiex_dnld_sleep_confirm_cmd(struct mwifiex_adapter *adapter)
 	struct mwifiex_opt_sleep_confirm *sleep_cfm_buf =
 				(struct mwifiex_opt_sleep_confirm *)
 						adapter->sleep_cfm->data;
+	struct sk_buff *sleep_cfm_tmp;
+	__le32 tmp;
+
 	priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
 
 	sleep_cfm_buf->seq_num =
@@ -240,10 +257,28 @@ static int mwifiex_dnld_sleep_confirm_cmd(struct mwifiex_adapter *adapter)
 					 priv->bss_type)));
 	adapter->seq_num++;
 
-	skb_push(adapter->sleep_cfm, INTF_HEADER_LEN);
-	ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_CMD,
-					   adapter->sleep_cfm, NULL);
-	skb_pull(adapter->sleep_cfm, INTF_HEADER_LEN);
+	if (adapter->iface_type == MWIFIEX_USB) {
+		sleep_cfm_tmp =
+			dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
+				      + MWIFIEX_TYPE_LEN);
+		skb_put(sleep_cfm_tmp, sizeof(struct mwifiex_opt_sleep_confirm)
+			+ MWIFIEX_TYPE_LEN);
+		tmp = cpu_to_le32(MWIFIEX_USB_TYPE_CMD);
+		memcpy(sleep_cfm_tmp->data, &tmp, MWIFIEX_TYPE_LEN);
+		memcpy(sleep_cfm_tmp->data + MWIFIEX_TYPE_LEN,
+		       adapter->sleep_cfm->data,
+		       sizeof(struct mwifiex_opt_sleep_confirm));
+		ret = adapter->if_ops.host_to_card(adapter,
+						   MWIFIEX_USB_EP_CMD_EVENT,
+						   sleep_cfm_tmp, NULL);
+		if (ret != -EBUSY)
+			dev_kfree_skb_any(sleep_cfm_tmp);
+	} else {
+		skb_push(adapter->sleep_cfm, INTF_HEADER_LEN);
+		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_CMD,
+						   adapter->sleep_cfm, NULL);
+		skb_pull(adapter->sleep_cfm, INTF_HEADER_LEN);
+	}
 
 	if (ret == -1) {
 		dev_err(adapter->dev, "SLEEP_CFM: failed\n");
@@ -343,7 +378,12 @@ int mwifiex_free_cmd_buffer(struct mwifiex_adapter *adapter)
 		}
 		if (!cmd_array[i].resp_skb)
 			continue;
-		dev_kfree_skb_any(cmd_array[i].resp_skb);
+
+		if (adapter->iface_type == MWIFIEX_USB)
+			adapter->if_ops.cmdrsp_complete(adapter,
+							cmd_array[i].resp_skb);
+		else
+			dev_kfree_skb_any(cmd_array[i].resp_skb);
 	}
 	/* Release struct cmd_ctrl_node */
 	if (adapter->cmd_pool) {
@@ -1083,6 +1123,7 @@ mwifiex_process_hs_config(struct mwifiex_adapter *adapter)
 						    MWIFIEX_BSS_ROLE_ANY),
 				   false);
 }
+EXPORT_SYMBOL_GPL(mwifiex_process_hs_config);
 
 /*
  * This function handles the command response of a sleep confirm command.

drivers/net/wireless/mwifiex/decl.h

@@ -53,6 +53,7 @@
 #define MWIFIEX_RATE_BITMAP_MCS127 159
 
 #define MWIFIEX_RX_DATA_BUF_SIZE     (4 * 1024)
+#define MWIFIEX_RX_CMD_BUF_SIZE	     (2 * 1024)
 
 #define MWIFIEX_RTS_MIN_VALUE              (0)
 #define MWIFIEX_RTS_MAX_VALUE              (2347)

drivers/net/wireless/mwifiex/fw.h

@@ -81,6 +81,11 @@ enum KEY_TYPE_ID {
 #define FIRMWARE_READY_SDIO				0xfedc
 #define FIRMWARE_READY_PCIE				0xfedcba00
 
+enum mwifiex_usb_ep {
+	MWIFIEX_USB_EP_CMD_EVENT = 1,
+	MWIFIEX_USB_EP_DATA = 2,
+};
+
 enum MWIFIEX_802_11_PRIVACY_FILTER {
 	MWIFIEX_802_11_PRIV_FILTER_ACCEPT_ALL,
 	MWIFIEX_802_11_PRIV_FILTER_8021X_WEP

drivers/net/wireless/mwifiex/init.c

@@ -188,10 +188,10 @@ static void mwifiex_init_adapter(struct mwifiex_adapter *adapter)
 
 	adapter->cmd_sent = false;
 
-	if (adapter->iface_type == MWIFIEX_PCIE)
-		adapter->data_sent = false;
-	else
+	if (adapter->iface_type == MWIFIEX_SDIO)
 		adapter->data_sent = true;
+	else
+		adapter->data_sent = false;
 
 	adapter->cmd_resp_received = false;
 	adapter->event_received = false;
@@ -379,7 +379,8 @@ mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 
 	dev_dbg(adapter->dev, "info: free scan table\n");
 
-	adapter->if_ops.cleanup_if(adapter);
+	if (adapter->if_ops.cleanup_if)
+		adapter->if_ops.cleanup_if(adapter);
 
 	if (adapter->sleep_cfm)
 		dev_kfree_skb_any(adapter->sleep_cfm);
@@ -419,6 +420,8 @@ int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
 	spin_lock_init(&adapter->cmd_pending_q_lock);
 	spin_lock_init(&adapter->scan_pending_q_lock);
 
+	skb_queue_head_init(&adapter->usb_rx_data_q);
+
 	for (i = 0; i < adapter->priv_num; ++i) {
 		INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
 		adapter->bss_prio_tbl[i].bss_prio_cur = NULL;
@@ -574,6 +577,7 @@ mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
 	struct mwifiex_private *priv;
 	s32 i;
 	unsigned long flags;
+	struct sk_buff *skb;
 
 	/* mwifiex already shutdown */
 	if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
@@ -601,6 +605,18 @@ mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
 
 	spin_lock_irqsave(&adapter->mwifiex_lock, flags);
 
+	if (adapter->if_ops.data_complete) {
+		while ((skb = skb_dequeue(&adapter->usb_rx_data_q))) {
+			struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
+
+			priv = adapter->priv[rx_info->bss_num];
+			if (priv)
+				priv->stats.rx_dropped++;
+
+			adapter->if_ops.data_complete(adapter, skb);
+		}
+	}
+
 	/* Free adapter structure */
 	mwifiex_free_adapter(adapter);
 
@@ -630,24 +646,28 @@ int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
 	int ret;
 	u32 poll_num = 1;
 
-	adapter->winner = 0;
+	if (adapter->if_ops.check_fw_status) {
+		adapter->winner = 0;
 
-	/* Check if firmware is already running */
-	ret = adapter->if_ops.check_fw_status(adapter, poll_num);
-	if (!ret) {
-		dev_notice(adapter->dev,
-			   "WLAN FW already running! Skip FW download\n");
-		goto done;
-	}
-	poll_num = MAX_FIRMWARE_POLL_TRIES;
-
-	/* Check if we are the winner for downloading FW */
-	if (!adapter->winner) {
-		dev_notice(adapter->dev,
-			   "Other intf already running! Skip FW download\n");
-		poll_num = MAX_MULTI_INTERFACE_POLL_TRIES;
-		goto poll_fw;
+		/* check if firmware is already running */
+		ret = adapter->if_ops.check_fw_status(adapter, poll_num);
+		if (!ret) {
+			dev_notice(adapter->dev,
+				   "WLAN FW already running! Skip FW dnld\n");
+			goto done;
+		}
+
+		poll_num = MAX_FIRMWARE_POLL_TRIES;
+
+		/* check if we are the winner for downloading FW */
+		if (!adapter->winner) {
+			dev_notice(adapter->dev,
+				   "FW already running! Skip FW dnld\n");
+			poll_num = MAX_MULTI_INTERFACE_POLL_TRIES;
+			goto poll_fw;
+		}
 	}
+
 	if (pmfw) {
 		/* Download firmware with helper */
 		ret = adapter->if_ops.prog_fw(adapter, pmfw);
@@ -666,6 +686,8 @@ int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
 	}
 done:
 	/* re-enable host interrupt for mwifiex after fw dnld is successful */
-	adapter->if_ops.enable_int(adapter);
+	if (adapter->if_ops.enable_int)
+		adapter->if_ops.enable_int(adapter);
+
 	return ret;
 }

drivers/net/wireless/mwifiex/main.c

@@ -58,8 +58,9 @@ static int mwifiex_register(void *card, struct mwifiex_if_ops *if_ops,
 	memmove(&adapter->if_ops, if_ops, sizeof(struct mwifiex_if_ops));
 
 	/* card specific initialization has been deferred until now .. */
-	if (adapter->if_ops.init_if(adapter))
-		goto error;
+	if (adapter->if_ops.init_if)
+		if (adapter->if_ops.init_if(adapter))
+			goto error;
 
 	adapter->priv_num = 0;
 
@@ -140,6 +141,7 @@ int mwifiex_main_process(struct mwifiex_adapter *adapter)
 {
 	int ret = 0;
 	unsigned long flags;
+	struct sk_buff *skb;
 
 	spin_lock_irqsave(&adapter->main_proc_lock, flags);
 
@@ -161,7 +163,8 @@ int mwifiex_main_process(struct mwifiex_adapter *adapter)
 		if (adapter->int_status) {
 			if (adapter->hs_activated)
 				mwifiex_process_hs_config(adapter);
-			adapter->if_ops.process_int_status(adapter);
+			if (adapter->if_ops.process_int_status)
+				adapter->if_ops.process_int_status(adapter);
 		}
 
 		/* Need to wake up the card ? */
@@ -174,6 +177,7 @@ int mwifiex_main_process(struct mwifiex_adapter *adapter)
 			adapter->if_ops.wakeup(adapter);
 			continue;
 		}
+
 		if (IS_CARD_RX_RCVD(adapter)) {
 			adapter->pm_wakeup_fw_try = false;
 			if (adapter->ps_state == PS_STATE_SLEEP)
@@ -194,6 +198,11 @@ int mwifiex_main_process(struct mwifiex_adapter *adapter)
 			}
 		}
 
+		/* Check Rx data for USB */
+		if (adapter->iface_type == MWIFIEX_USB)
+			while ((skb = skb_dequeue(&adapter->usb_rx_data_q)))
+				mwifiex_handle_rx_packet(adapter, skb);
+
 		/* Check for Cmd Resp */
 		if (adapter->cmd_resp_received) {
 			adapter->cmd_resp_received = false;
@@ -317,7 +326,10 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 	fw.fw_buf = (u8 *) adapter->firmware->data;
 	fw.fw_len = adapter->firmware->size;
 
-	ret = mwifiex_dnld_fw(adapter, &fw);
+	if (adapter->if_ops.dnld_fw)
+		ret = adapter->if_ops.dnld_fw(adapter, &fw);
+	else
+		ret = mwifiex_dnld_fw(adapter, &fw);
 	if (ret == -1)
 		goto done;
 
@@ -731,7 +743,8 @@ mwifiex_add_card(void *card, struct semaphore *sem,
 
 err_init_fw:
 	pr_debug("info: %s: unregister device\n", __func__);
-	adapter->if_ops.unregister_dev(adapter);
+	if (adapter->if_ops.unregister_dev)
+		adapter->if_ops.unregister_dev(adapter);
 err_registerdev:
 	adapter->surprise_removed = true;
 	mwifiex_terminate_workqueue(adapter);
@@ -836,7 +849,8 @@ int mwifiex_remove_card(struct mwifiex_adapter *adapter, struct semaphore *sem)
 
 	/* Unregister device */
 	dev_dbg(adapter->dev, "info: unregister device\n");
-	adapter->if_ops.unregister_dev(adapter);
+	if (adapter->if_ops.unregister_dev)
+		adapter->if_ops.unregister_dev(adapter);
 	/* Free adapter structure */
 	dev_dbg(adapter->dev, "info: free adapter\n");
 	mwifiex_free_adapter(adapter);