zd1211rw: support for mesh interface and beaconing

The previously unused CR_CAM_MODE register is set to MODE_AP_WDS. This makes the
driver ack mesh (WDS) frames. It does not affect Infra functionality of the
driver.

Previously missing beaconing support has been added. This might also help
implement a currently missing ah-hoc mode.

Support for interrupts from the device have been added, but we are not handling
most of them.

Mesh interfaces are considered associated as long as the interface is up.

Signed-off-by: Luis Carlos Cobo <luisca@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/zd1211rw/zd_chip.c

@@ -809,6 +809,7 @@ static int hw_init_hmac(struct zd_chip *chip)
 		{ CR_AFTER_PNP,			0x1 },
 		{ CR_WEP_PROTECT,		0x114 },
 		{ CR_IFS_VALUE,			IFS_VALUE_DEFAULT },
+		{ CR_CAM_MODE,			MODE_AP_WDS},
 	};
 
 	ZD_ASSERT(mutex_is_locked(&chip->mutex));

drivers/net/wireless/zd1211rw/zd_chip.h

@@ -489,6 +489,7 @@ enum {
 
 #define CR_RX_OFFSET			CTL_REG(0x065c)
 
+#define CR_BCN_LENGTH			CTL_REG(0x0664)
 #define CR_PHY_DELAY			CTL_REG(0x066C)
 #define CR_BCN_FIFO			CTL_REG(0x0670)
 #define CR_SNIFFER_ON			CTL_REG(0x0674)
@@ -545,6 +546,8 @@ enum {
 #define RX_FILTER_CTRL (RX_FILTER_RTS | RX_FILTER_CTS | \
 	RX_FILTER_CFEND | RX_FILTER_CFACK)
 
+#define BCN_MODE_IBSS			0x2000000
+
 /* Monitor mode sets filter to 0xfffff */
 
 #define CR_ACK_TIMEOUT_EXT		CTL_REG(0x0690)
@@ -578,6 +581,11 @@ enum {
 
 /* CAM: Continuous Access Mode (power management) */
 #define CR_CAM_MODE			CTL_REG(0x0700)
+#define MODE_IBSS			0x0
+#define MODE_AP				0x1
+#define MODE_STA			0x2
+#define MODE_AP_WDS			0x3
+
 #define CR_CAM_ROLL_TB_LOW		CTL_REG(0x0704)
 #define CR_CAM_ROLL_TB_HIGH		CTL_REG(0x0708)
 #define CR_CAM_ADDRESS			CTL_REG(0x070C)

drivers/net/wireless/zd1211rw/zd_mac.c

@@ -475,6 +475,46 @@ static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
 	/* FIXME: Management frame? */
 }
 
+void zd_mac_config_beacon(struct ieee80211_hw *hw, struct sk_buff *beacon)
+{
+	struct zd_mac *mac = zd_hw_mac(hw);
+	u32 tmp, j = 0;
+	/* 4 more bytes for tail CRC */
+	u32 full_len = beacon->len + 4;
+	zd_iowrite32(&mac->chip, CR_BCN_FIFO_SEMAPHORE, 0);
+	zd_ioread32(&mac->chip, CR_BCN_FIFO_SEMAPHORE, &tmp);
+	while (tmp & 0x2) {
+		zd_ioread32(&mac->chip, CR_BCN_FIFO_SEMAPHORE, &tmp);
+		if ((++j % 100) == 0) {
+			printk(KERN_ERR "CR_BCN_FIFO_SEMAPHORE not ready\n");
+			if (j >= 500)  {
+				printk(KERN_ERR "Giving up beacon config.\n");
+				return;
+			}
+		}
+		msleep(1);
+	}
+
+	zd_iowrite32(&mac->chip, CR_BCN_FIFO, full_len - 1);
+	if (zd_chip_is_zd1211b(&mac->chip))
+		zd_iowrite32(&mac->chip, CR_BCN_LENGTH, full_len - 1);
+
+	for (j = 0 ; j < beacon->len; j++)
+		zd_iowrite32(&mac->chip, CR_BCN_FIFO,
+				*((u8 *)(beacon->data + j)));
+
+	for (j = 0; j < 4; j++)
+		zd_iowrite32(&mac->chip, CR_BCN_FIFO, 0x0);
+
+	zd_iowrite32(&mac->chip, CR_BCN_FIFO_SEMAPHORE, 1);
+	/* 802.11b/g 2.4G CCK 1Mb
+	 * 802.11a, not yet implemented, uses different values (see GPL vendor
+	 * driver)
+	 */
+	zd_iowrite32(&mac->chip, CR_BCN_PLCP_CFG, 0x00000400 |
+			(full_len << 19));
+}
+
 static int fill_ctrlset(struct zd_mac *mac,
 			struct sk_buff *skb,
 			struct ieee80211_tx_control *control)
@@ -709,6 +749,7 @@ static int zd_op_add_interface(struct ieee80211_hw *hw,
 
 	switch (conf->type) {
 	case IEEE80211_IF_TYPE_MNTR:
+	case IEEE80211_IF_TYPE_MESH_POINT:
 	case IEEE80211_IF_TYPE_STA:
 		mac->type = conf->type;
 		break;
@@ -738,15 +779,43 @@ static int zd_op_config_interface(struct ieee80211_hw *hw,
 				   struct ieee80211_if_conf *conf)
 {
 	struct zd_mac *mac = zd_hw_mac(hw);
+	int associated;
+
+	if (mac->type == IEEE80211_IF_TYPE_MESH_POINT) {
+		associated = true;
+		if (conf->beacon) {
+			zd_mac_config_beacon(hw, conf->beacon);
+			kfree_skb(conf->beacon);
+			zd_set_beacon_interval(&mac->chip, BCN_MODE_IBSS |
+					hw->conf.beacon_int);
+		}
+	} else
+		associated = is_valid_ether_addr(conf->bssid);
 
 	spin_lock_irq(&mac->lock);
-	mac->associated = is_valid_ether_addr(conf->bssid);
+	mac->associated = associated;
 	spin_unlock_irq(&mac->lock);
 
 	/* TODO: do hardware bssid filtering */
 	return 0;
 }
 
+void zd_process_intr(struct work_struct *work)
+{
+	u16 int_status;
+	struct zd_mac *mac = container_of(work, struct zd_mac, process_intr);
+
+	int_status = le16_to_cpu(*(u16 *)(mac->intr_buffer+4));
+	if (int_status & INT_CFG_NEXT_BCN) {
+		if (net_ratelimit())
+			dev_dbg_f(zd_mac_dev(mac), "INT_CFG_NEXT_BCN\n");
+	} else
+		dev_dbg_f(zd_mac_dev(mac), "Unsupported interrupt\n");
+
+	zd_chip_enable_hwint(&mac->chip);
+}
+
+
 static void set_multicast_hash_handler(struct work_struct *work)
 {
 	struct zd_mac *mac =
@@ -912,7 +981,8 @@ struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf)
 
 	hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &mac->band;
 
-	hw->flags = IEEE80211_HW_RX_INCLUDES_FCS;
+	hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
+		    IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE;
 	hw->max_rssi = 100;
 	hw->max_signal = 100;
 
@@ -926,6 +996,7 @@ struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf)
 	INIT_WORK(&mac->set_multicast_hash_work, set_multicast_hash_handler);
 	INIT_WORK(&mac->set_rts_cts_work, set_rts_cts_work);
 	INIT_WORK(&mac->set_rx_filter_work, set_rx_filter_handler);
+	INIT_WORK(&mac->process_intr, zd_process_intr);
 
 	SET_IEEE80211_DEV(hw, &intf->dev);
 	return hw;

drivers/net/wireless/zd1211rw/zd_mac.h

@@ -172,12 +172,15 @@ struct zd_tx_skb_control_block {
 struct zd_mac {
 	struct zd_chip chip;
 	spinlock_t lock;
+	spinlock_t intr_lock;
 	struct ieee80211_hw *hw;
 	struct housekeeping housekeeping;
 	struct work_struct set_multicast_hash_work;
 	struct work_struct set_rts_cts_work;
 	struct work_struct set_rx_filter_work;
+	struct work_struct process_intr;
 	struct zd_mc_hash multicast_hash;
+	u8 intr_buffer[USB_MAX_EP_INT_BUFFER];
 	u8 regdomain;
 	u8 default_regdomain;
 	int type;

drivers/net/wireless/zd1211rw/zd_usb.c

@@ -97,6 +97,7 @@ MODULE_DEVICE_TABLE(usb, usb_ids);
 #define FW_ZD1211B_PREFIX	"zd1211/zd1211b_"
 
 /* USB device initialization */
+static void int_urb_complete(struct urb *urb);
 
 static int request_fw_file(
 	const struct firmware **fw, const char *name, struct device *device)
@@ -336,11 +337,18 @@ static inline void handle_regs_int(struct urb *urb)
 	struct zd_usb *usb = urb->context;
 	struct zd_usb_interrupt *intr = &usb->intr;
 	int len;
+	u16 int_num;
 
 	ZD_ASSERT(in_interrupt());
 	spin_lock(&intr->lock);
 
-	if (intr->read_regs_enabled) {
+	int_num = le16_to_cpu(*(u16 *)(urb->transfer_buffer+2));
+	if (int_num == CR_INTERRUPT) {
+		struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
+		memcpy(&mac->intr_buffer, urb->transfer_buffer,
+				USB_MAX_EP_INT_BUFFER);
+		schedule_work(&mac->process_intr);
+	} else if (intr->read_regs_enabled) {
 		intr->read_regs.length = len = urb->actual_length;
 
 		if (len > sizeof(intr->read_regs.buffer))
@@ -351,7 +359,6 @@ static inline void handle_regs_int(struct urb *urb)
 		goto out;
 	}
 
-	dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
 out:
 	spin_unlock(&intr->lock);
 }