1 files changed, 255 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00ring.h b/drivers/net/wireless/rt2x00/rt2x00ring.h
new file mode 100644
index 000000000000..122c75248e74
--- /dev/null
+++ b/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 */