1 files changed, 120 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 7e0baf6deedf..4a15e42ad00a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -471,6 +471,126 @@ static int iwl_send_beacon_cmd(struct iwl_priv *priv)
         return rc;
 }
 
+static inline dma_addr_t iwl_tfd_tb_get_addr(struct iwl_tfd *tfd, u8 idx)
+{
+        struct iwl_tfd_tb *tb = &tfd->tbs[idx];
+
+        dma_addr_t addr = get_unaligned_le32(&tb->lo);
+        if (sizeof(dma_addr_t) > sizeof(u32))
+                addr |=
+                ((dma_addr_t)(le16_to_cpu(tb->hi_n_len) & 0xF) << 16) << 16;
+
+        return addr;
+}
+
+static inline u16 iwl_tfd_tb_get_len(struct iwl_tfd *tfd, u8 idx)
+{
+        struct iwl_tfd_tb *tb = &tfd->tbs[idx];
+
+        return le16_to_cpu(tb->hi_n_len) >> 4;
+}
+
+static inline void iwl_tfd_set_tb(struct iwl_tfd *tfd, u8 idx,
+                                  dma_addr_t addr, u16 len)
+{
+        struct iwl_tfd_tb *tb = &tfd->tbs[idx];
+        u16 hi_n_len = len << 4;
+
+        put_unaligned_le32(addr, &tb->lo);
+        if (sizeof(dma_addr_t) > sizeof(u32))
+                hi_n_len |= ((addr >> 16) >> 16) & 0xF;
+
+        tb->hi_n_len = cpu_to_le16(hi_n_len);
+
+        tfd->num_tbs = idx + 1;
+}
+
+static inline u8 iwl_tfd_get_num_tbs(struct iwl_tfd *tfd)
+{
+        return tfd->num_tbs & 0x1f;
+}
+
+/**
+ * iwl_hw_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
+ * @priv - driver private data
+ * @txq - tx queue
+ *
+ * Does NOT advance any TFD circular buffer read/write indexes
+ * Does NOT free the TFD itself (which is within circular buffer)
+ */
+void iwl_hw_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq)
+{
+        struct iwl_tfd *tfd_tmp = (struct iwl_tfd *)&txq->tfds[0];
+        struct iwl_tfd *tfd;
+        struct pci_dev *dev = priv->pci_dev;
+        int index = txq->q.read_ptr;
+        int i;
+        int num_tbs;
+
+        tfd = &tfd_tmp[index];
+
+        /* Sanity check on number of chunks */
+        num_tbs = iwl_tfd_get_num_tbs(tfd);
+
+        if (num_tbs >= IWL_NUM_OF_TBS) {
+                IWL_ERR(priv, "Too many chunks: %i\n", num_tbs);
+                /* @todo issue fatal error, it is quite serious situation */
+                return;
+        }
+
+        /* Unmap tx_cmd */
+        if (num_tbs)
+                pci_unmap_single(dev,
+                                pci_unmap_addr(&txq->cmd[index]->meta, mapping),
+                                pci_unmap_len(&txq->cmd[index]->meta, len),
+                                PCI_DMA_TODEVICE);
+
+        /* Unmap chunks, if any. */
+        for (i = 1; i < num_tbs; i++) {
+                pci_unmap_single(dev, iwl_tfd_tb_get_addr(tfd, i),
+                                iwl_tfd_tb_get_len(tfd, i), PCI_DMA_TODEVICE);
+
+                if (txq->txb) {
+                        dev_kfree_skb(txq->txb[txq->q.read_ptr].skb[i - 1]);
+                        txq->txb[txq->q.read_ptr].skb[i - 1] = NULL;
+                }
+        }
+}
+
+int iwl_hw_txq_attach_buf_to_tfd(struct iwl_priv *priv,
+                                 struct iwl_tx_queue *txq,
+                                 dma_addr_t addr, u16 len,
+                                 u8 reset, u8 pad)
+{
+        struct iwl_queue *q;
+        struct iwl_tfd *tfd;
+        u32 num_tbs;
+
+        q = &txq->q;
+        tfd = &txq->tfds[q->write_ptr];
+
+        if (reset)
+                memset(tfd, 0, sizeof(*tfd));
+
+        num_tbs = iwl_tfd_get_num_tbs(tfd);
+
+        /* Each TFD can point to a maximum 20 Tx buffers */
+        if (num_tbs >= IWL_NUM_OF_TBS) {
+                IWL_ERR(priv, "Error can not send more than %d chunks\n",
+                          IWL_NUM_OF_TBS);
+                return -EINVAL;
+        }
+
+        BUG_ON(addr & ~DMA_BIT_MASK(36));
+        if (unlikely(addr & ~IWL_TX_DMA_MASK))
+                IWL_ERR(priv, "Unaligned address = %llx\n",
+                          (unsigned long long)addr);
+
+        iwl_tfd_set_tb(tfd, num_tbs, addr, len);
+
+        return 0;
+}
+
 /******************************************************************************
  *
  * Misc. internal state and helper functions