[RT2x00]: add driver for Ralink wireless hardware

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wireless/rt2x00/rt2x00ring.h

@@ -0,0 +1,255 @@
+/*
+	Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
+	<http://rt2x00.serialmonkey.com>
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program; if not, write to the
+	Free Software Foundation, Inc.,
+	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/*
+	Module: rt2x00
+	Abstract: rt2x00 ring datastructures and routines
+ */
+
+#ifndef RT2X00RING_H
+#define RT2X00RING_H
+
+/*
+ * data_desc
+ * Each data entry also contains a descriptor which is used by the
+ * device to determine what should be done with the packet and
+ * what the current status is.
+ * This structure is greatly simplified, but the descriptors
+ * are basically a list of little endian 32 bit values.
+ * Make the array by default 1 word big, this will allow us
+ * to use sizeof() correctly.
+ */
+struct data_desc {
+	__le32 word[1];
+};
+
+/*
+ * data_entry_desc
+ * Summary of information that should be written into the
+ * descriptor for sending a TX frame.
+ */
+struct data_entry_desc {
+	unsigned long flags;
+#define ENTRY_TXDONE		1
+#define ENTRY_TXD_RTS_FRAME	2
+#define ENTRY_TXD_OFDM_RATE	3
+#define ENTRY_TXD_MORE_FRAG	4
+#define ENTRY_TXD_REQ_TIMESTAMP	5
+#define ENTRY_TXD_BURST		6
+
+/*
+ * Queue ID. ID's 0-4 are data TX rings
+ */
+	int queue;
+#define QUEUE_MGMT		13
+#define QUEUE_RX		14
+#define QUEUE_OTHER		15
+
+	/*
+	 * PLCP values.
+	 */
+	u16 length_high;
+	u16 length_low;
+	u16 signal;
+	u16 service;
+
+	/*
+	 * Timing information
+	 */
+	int aifs;
+	int ifs;
+	int cw_min;
+	int cw_max;
+};
+
+/*
+ * data_entry
+ * The data ring is a list of data entries.
+ * Each entry holds a reference to the descriptor
+ * and the data buffer. For TX rings the reference to the
+ * sk_buff of the packet being transmitted is also stored here.
+ */
+struct data_entry {
+	/*
+	 * Status flags
+	 */
+	unsigned long flags;
+#define ENTRY_OWNER_NIC		1
+
+	/*
+	 * Ring we belong to.
+	 */
+	struct data_ring *ring;
+
+	/*
+	 * sk_buff for the packet which is being transmitted
+	 * in this entry (Only used with TX related rings).
+	 */
+	struct sk_buff *skb;
+
+	/*
+	 * Store a ieee80211_tx_status structure in each
+	 * ring entry, this will optimize the txdone
+	 * handler.
+	 */
+	struct ieee80211_tx_status tx_status;
+
+	/*
+	 * private pointer specific to driver.
+	 */
+	void *priv;
+
+	/*
+	 * Data address for this entry.
+	 */
+	void *data_addr;
+	dma_addr_t data_dma;
+};
+
+/*
+ * data_ring
+ * Data rings are used by the device to send and receive packets.
+ * The data_addr is the base address of the data memory.
+ * To determine at which point in the ring we are,
+ * have to use the rt2x00_ring_index_*() functions.
+ */
+struct data_ring {
+	/*
+	 * Pointer to main rt2x00dev structure where this
+	 * ring belongs to.
+	 */
+	struct rt2x00_dev *rt2x00dev;
+
+	/*
+	 * Base address for the device specific data entries.
+	 */
+	struct data_entry *entry;
+
+	/*
+	 * TX queue statistic info.
+	 */
+	struct ieee80211_tx_queue_stats_data stats;
+
+	/*
+	 * TX Queue parameters.
+	 */
+	struct ieee80211_tx_queue_params tx_params;
+
+	/*
+	 * Base address for data ring.
+	 */
+	dma_addr_t data_dma;
+	void *data_addr;
+
+	/*
+	 * Index variables.
+	 */
+	u16 index;
+	u16 index_done;
+
+	/*
+	 * Size of packet and descriptor in bytes.
+	 */
+	u16 data_size;
+	u16 desc_size;
+};
+
+/*
+ * Handlers to determine the address of the current device specific
+ * data entry, where either index or index_done points to.
+ */
+static inline struct data_entry *rt2x00_get_data_entry(struct data_ring *ring)
+{
+	return &ring->entry[ring->index];
+}
+
+static inline struct data_entry *rt2x00_get_data_entry_done(struct data_ring
+							    *ring)
+{
+	return &ring->entry[ring->index_done];
+}
+
+/*
+ * Total ring memory
+ */
+static inline int rt2x00_get_ring_size(struct data_ring *ring)
+{
+	return ring->stats.limit * (ring->desc_size + ring->data_size);
+}
+
+/*
+ * Ring index manipulation functions.
+ */
+static inline void rt2x00_ring_index_inc(struct data_ring *ring)
+{
+	ring->index++;
+	if (ring->index >= ring->stats.limit)
+		ring->index = 0;
+	ring->stats.len++;
+}
+
+static inline void rt2x00_ring_index_done_inc(struct data_ring *ring)
+{
+	ring->index_done++;
+	if (ring->index_done >= ring->stats.limit)
+		ring->index_done = 0;
+	ring->stats.len--;
+	ring->stats.count++;
+}
+
+static inline void rt2x00_ring_index_clear(struct data_ring *ring)
+{
+	ring->index = 0;
+	ring->index_done = 0;
+	ring->stats.len = 0;
+	ring->stats.count = 0;
+}
+
+static inline int rt2x00_ring_empty(struct data_ring *ring)
+{
+	return ring->stats.len == 0;
+}
+
+static inline int rt2x00_ring_full(struct data_ring *ring)
+{
+	return ring->stats.len == ring->stats.limit;
+}
+
+static inline int rt2x00_ring_free(struct data_ring *ring)
+{
+	return ring->stats.limit - ring->stats.len;
+}
+
+/*
+ * TX/RX Descriptor access functions.
+ */
+static inline void rt2x00_desc_read(struct data_desc *desc,
+				    const u8 word, u32 *value)
+{
+	*value = le32_to_cpu(desc->word[word]);
+}
+
+static inline void rt2x00_desc_write(struct data_desc *desc,
+				     const u8 word, const u32 value)
+{
+	desc->word[word] = cpu_to_le32(value);
+}
+
+#endif /* RT2X00RING_H */