iwl3945: Use iwlcore TX queue management routines

By adding an additional hw_params (tfd_size) and a new iwl_lib ops (txq_init),
we can now use the iwlcore TX queue management routines.
We had to add a new hw_params because we need to allocate the right DMA buffer
for TFDs, and those have a different sizes depending if you're on 3945 or agn.

Signed-off-by: Samuel Ortiz <samuel.ortiz@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

8 files changed, 60 insertions, 246 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c
index 22770f44c2f..2689113f4e6 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.c
@@ -1068,8 +1068,8 @@ static int iwl3945_txq_ctx_reset(struct iwl_priv *priv)
         for (txq_id = 0; txq_id < TFD_QUEUE_MAX; txq_id++) {
                 slots_num = (txq_id == IWL_CMD_QUEUE_NUM) ?
                                 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
-                rc = iwl3945_tx_queue_init(priv, &priv->txq[txq_id], slots_num,
-                                txq_id);
+                rc = iwl_tx_queue_init(priv, &priv->txq[txq_id], slots_num,
+                                       txq_id);
                 if (rc) {
                         IWL_ERR(priv, "Tx %d queue init failed\n", txq_id);
                         goto error;
@@ -1258,7 +1258,7 @@ void iwl3945_hw_txq_ctx_free(struct iwl_priv *priv)
 
         /* Tx queues */
         for (txq_id = 0; txq_id < TFD_QUEUE_MAX; txq_id++)
-                iwl3945_tx_queue_free(priv, &priv->txq[txq_id]);
+                iwl_tx_queue_free(priv, txq_id);
 }
 
 void iwl3945_hw_txq_ctx_stop(struct iwl_priv *priv)
@@ -2491,6 +2491,7 @@ int iwl3945_hw_set_hw_params(struct iwl_priv *priv)
                 return -ENOMEM;
         }
 
+        priv->hw_params.tfd_size = sizeof(struct iwl3945_tfd);
         priv->hw_params.rx_buf_size = IWL_RX_BUF_SIZE_3K;
         priv->hw_params.max_pkt_size = 2342;
         priv->hw_params.max_rxq_size = RX_QUEUE_SIZE;
@@ -2705,6 +2706,7 @@ static int iwl3945_load_bsm(struct iwl_priv *priv)
 static struct iwl_lib_ops iwl3945_lib = {
         .txq_attach_buf_to_tfd = iwl3945_hw_txq_attach_buf_to_tfd,
         .txq_free_tfd = iwl3945_hw_txq_free_tfd,
+        .txq_init = iwl3945_hw_tx_queue_init,
         .load_ucode = iwl3945_load_bsm,
         .apm_ops = {
                 .init = iwl3945_apm_init,
diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.c b/drivers/net/wireless/iwlwifi/iwl-4965.c
index b2985e25dc8..d7d956db19d 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.c
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.c
@@ -815,6 +815,7 @@ static int iwl4965_hw_set_hw_params(struct iwl_priv *priv)
         priv->hw_params.dma_chnl_num = FH49_TCSR_CHNL_NUM;
         priv->hw_params.scd_bc_tbls_size =
                         IWL49_NUM_QUEUES * sizeof(struct iwl4965_scd_bc_tbl);
+        priv->hw_params.tfd_size = sizeof(struct iwl_tfd);
         priv->hw_params.max_stations = IWL4965_STATION_COUNT;
         priv->hw_params.bcast_sta_id = IWL4965_BROADCAST_ID;
         priv->hw_params.max_data_size = IWL49_RTC_DATA_SIZE;
@@ -2297,6 +2298,7 @@ static struct iwl_lib_ops iwl4965_lib = {
         .txq_agg_disable = iwl4965_txq_agg_disable,
         .txq_attach_buf_to_tfd = iwl_hw_txq_attach_buf_to_tfd,
         .txq_free_tfd = iwl_hw_txq_free_tfd,
+        .txq_init = iwl_hw_tx_queue_init,
         .rx_handler_setup = iwl4965_rx_handler_setup,
         .setup_deferred_work = iwl4965_setup_deferred_work,
         .cancel_deferred_work = iwl4965_cancel_deferred_work,
diff --git a/drivers/net/wireless/iwlwifi/iwl-5000.c b/drivers/net/wireless/iwlwifi/iwl-5000.c
index 04c2585a634..89d92a8ca15 100644
--- a/drivers/net/wireless/iwlwifi/iwl-5000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-5000.c
@@ -837,6 +837,7 @@ static int iwl5000_hw_set_hw_params(struct iwl_priv *priv)
         priv->hw_params.dma_chnl_num = FH50_TCSR_CHNL_NUM;
         priv->hw_params.scd_bc_tbls_size =
                         IWL50_NUM_QUEUES * sizeof(struct iwl5000_scd_bc_tbl);
+        priv->hw_params.tfd_size = sizeof(struct iwl_tfd);
         priv->hw_params.max_stations = IWL5000_STATION_COUNT;
         priv->hw_params.bcast_sta_id = IWL5000_BROADCAST_ID;
         priv->hw_params.max_data_size = IWL50_RTC_DATA_SIZE;
@@ -1494,6 +1495,7 @@ static struct iwl_lib_ops iwl5000_lib = {
         .txq_agg_disable = iwl5000_txq_agg_disable,
         .txq_attach_buf_to_tfd = iwl_hw_txq_attach_buf_to_tfd,
         .txq_free_tfd = iwl_hw_txq_free_tfd,
+        .txq_init = iwl_hw_tx_queue_init,
         .rx_handler_setup = iwl5000_rx_handler_setup,
         .setup_deferred_work = iwl5000_setup_deferred_work,
         .is_valid_rtc_data_addr = iwl5000_hw_valid_rtc_data_addr,
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 4ce3d6a63d1..5c6b3fe3eed 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -592,6 +592,38 @@ int iwl_hw_txq_attach_buf_to_tfd(struct iwl_priv *priv,
         return 0;
 }
 
+/*
+ * Tell nic where to find circular buffer of Tx Frame Descriptors for
+ * given Tx queue, and enable the DMA channel used for that queue.
+ *
+ * 4965 supports up to 16 Tx queues in DRAM, mapped to up to 8 Tx DMA
+ * channels supported in hardware.
+ */
+int iwl_hw_tx_queue_init(struct iwl_priv *priv,
+                         struct iwl_tx_queue *txq)
+{
+        int ret;
+        unsigned long flags;
+        int txq_id = txq->q.id;
+
+        spin_lock_irqsave(&priv->lock, flags);
+        ret = iwl_grab_nic_access(priv);
+        if (ret) {
+                spin_unlock_irqrestore(&priv->lock, flags);
+                return ret;
+        }
+
+        /* Circular buffer (TFD queue in DRAM) physical base address */
+        iwl_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id),
+                             txq->q.dma_addr >> 8);
+
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->lock, flags);
+
+        return 0;
+}
+
+
 /******************************************************************************
  *
  * Misc. internal state and helper functions
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h
index 409caaa31bb..9a350806a21 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.h
+++ b/drivers/net/wireless/iwlwifi/iwl-core.h
@@ -116,6 +116,8 @@ struct iwl_lib_ops {
                                      u16 len, u8 reset, u8 pad);
         void (*txq_free_tfd)(struct iwl_priv *priv,
                              struct iwl_tx_queue *txq);
+        int (*txq_init)(struct iwl_priv *priv,
+                        struct iwl_tx_queue *txq);
         /* aggregations */
         int (*txq_agg_enable)(struct iwl_priv *priv, int txq_id, int tx_fifo,
                               int sta_id, int tid, u16 ssn_idx);
@@ -264,7 +266,12 @@ int iwl_hw_txq_attach_buf_to_tfd(struct iwl_priv *priv,
                                  dma_addr_t addr, u16 len, u8 reset, u8 pad);
 int iwl_tx_skb(struct iwl_priv *priv, struct sk_buff *skb);
 void iwl_hw_txq_ctx_free(struct iwl_priv *priv);
+int iwl_hw_tx_queue_init(struct iwl_priv *priv,
+                         struct iwl_tx_queue *txq);
 int iwl_txq_update_write_ptr(struct iwl_priv *priv, struct iwl_tx_queue *txq);
+int iwl_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq,
+                      int slots_num, u32 txq_id);
+void iwl_tx_queue_free(struct iwl_priv *priv, int txq_id);
 int iwl_tx_agg_start(struct iwl_priv *priv, const u8 *ra, u16 tid, u16 *ssn);
 int iwl_tx_agg_stop(struct iwl_priv *priv , const u8 *ra, u16 tid);
 int iwl_txq_check_empty(struct iwl_priv *priv, int sta_id, u8 tid, int txq_id);
diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index 78ce4f49c56..5aa22d61e39 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -567,6 +567,7 @@ struct iwl_sensitivity_ranges {
  * @max_txq_num: Max # Tx queues supported
  * @dma_chnl_num: Number of Tx DMA/FIFO channels
  * @scd_bc_tbls_size: size of scheduler byte count tables
+ * @tfd_size: TFD size
  * @tx/rx_chains_num: Number of TX/RX chains
  * @valid_tx/rx_ant: usable antennas
  * @max_rxq_size: Max # Rx frames in Rx queue (must be power-of-2)
@@ -587,6 +588,7 @@ struct iwl_hw_params {
         u8 max_txq_num;
         u8 dma_chnl_num;
         u16 scd_bc_tbls_size;
+        u32 tfd_size;
         u8  tx_chains_num;
         u8  rx_chains_num;
         u8  valid_tx_ant;
diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c
index 83e9f32cbd8..58118c8224c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-tx.c
@@ -131,7 +131,7 @@ EXPORT_SYMBOL(iwl_txq_update_write_ptr);
  * Free all buffers.
  * 0-fill, but do not free "txq" descriptor structure.
  */
-static void iwl_tx_queue_free(struct iwl_priv *priv, int txq_id)
+void iwl_tx_queue_free(struct iwl_priv *priv, int txq_id)
 {
         struct iwl_tx_queue *txq = &priv->txq[txq_id];
         struct iwl_queue *q = &txq->q;
@@ -154,7 +154,7 @@ static void iwl_tx_queue_free(struct iwl_priv *priv, int txq_id)
 
         /* De-alloc circular buffer of TFDs */
         if (txq->q.n_bd)
-                pci_free_consistent(dev, sizeof(struct iwl_tfd) *
+                pci_free_consistent(dev, priv->hw_params.tfd_size *
                                     txq->q.n_bd, txq->tfds, txq->q.dma_addr);
 
         /* De-alloc array of per-TFD driver data */
@@ -164,7 +164,7 @@ static void iwl_tx_queue_free(struct iwl_priv *priv, int txq_id)
         /* 0-fill queue descriptor structure */
         memset(txq, 0, sizeof(*txq));
 }
-
+EXPORT_SYMBOL(iwl_tx_queue_free);
 
 /**
  * iwl_cmd_queue_free - Deallocate DMA queue.
@@ -295,12 +295,12 @@ static int iwl_tx_queue_alloc(struct iwl_priv *priv,
         /* Circular buffer of transmit frame descriptors (TFDs),
          * shared with device */
         txq->tfds = pci_alloc_consistent(dev,
-                        sizeof(struct iwl_tfd) * TFD_QUEUE_SIZE_MAX,
+                        priv->hw_params.tfd_size * TFD_QUEUE_SIZE_MAX,
                         &txq->q.dma_addr);
 
         if (!txq->tfds) {
                 IWL_ERR(priv, "pci_alloc_consistent(%zd) failed\n",
-                          sizeof(struct iwl_tfd) * TFD_QUEUE_SIZE_MAX);
+                          priv->hw_params.tfd_size * TFD_QUEUE_SIZE_MAX);
                 goto error;
         }
         txq->q.id = id;
@@ -314,42 +314,11 @@ static int iwl_tx_queue_alloc(struct iwl_priv *priv,
         return -ENOMEM;
 }
 
-/*
- * Tell nic where to find circular buffer of Tx Frame Descriptors for
- * given Tx queue, and enable the DMA channel used for that queue.
- *
- * 4965 supports up to 16 Tx queues in DRAM, mapped to up to 8 Tx DMA
- * channels supported in hardware.
- */
-static int iwl_hw_tx_queue_init(struct iwl_priv *priv,
-                                struct iwl_tx_queue *txq)
-{
-        int ret;
-        unsigned long flags;
-        int txq_id = txq->q.id;
-
-        spin_lock_irqsave(&priv->lock, flags);
-        ret = iwl_grab_nic_access(priv);
-        if (ret) {
-                spin_unlock_irqrestore(&priv->lock, flags);
-                return ret;
-        }
-
-        /* Circular buffer (TFD queue in DRAM) physical base address */
-        iwl_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id),
-                             txq->q.dma_addr >> 8);
-
-        iwl_release_nic_access(priv);
-        spin_unlock_irqrestore(&priv->lock, flags);
-
-        return 0;
-}
-
 /**
  * iwl_tx_queue_init - Allocate and initialize one tx/cmd queue
  */
-static int iwl_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq,
-                             int slots_num, u32 txq_id)
+int iwl_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq,
+                      int slots_num, u32 txq_id)
 {
         int i, len;
         int ret;
@@ -391,7 +360,7 @@ static int iwl_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq,
         iwl_queue_init(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num, txq_id);
 
         /* Tell device where to find queue */
-        iwl_hw_tx_queue_init(priv, txq);
+        priv->cfg->ops->lib->txq_init(priv, txq);
 
         return 0;
 err:
@@ -406,6 +375,8 @@ err:
         }
         return -ENOMEM;
 }
+EXPORT_SYMBOL(iwl_tx_queue_init);
+
 /**
  * iwl_hw_txq_ctx_free - Free TXQ Context
  *
diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index bc10e2ae597..14f95238059 100644
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -93,210 +93,6 @@ struct iwl_mod_params iwl3945_mod_params = {
         /* the rest are 0 by default */
 };
 
-/*************** DMA-QUEUE-GENERAL-FUNCTIONS  *****
- * DMA services
- *
- * Theory of operation
- *
- * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
- * of buffer descriptors, each of which points to one or more data buffers for
- * the device to read from or fill.  Driver and device exchange status of each
- * queue via "read" and "write" pointers.  Driver keeps minimum of 2 empty
- * entries in each circular buffer, to protect against confusing empty and full
- * queue states.
- *
- * The device reads or writes the data in the queues via the device's several
- * DMA/FIFO channels.  Each queue is mapped to a single DMA channel.
- *
- * For Tx queue, there are low mark and high mark limits. If, after queuing
- * the packet for Tx, free space become < low mark, Tx queue stopped. When
- * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
- * Tx queue resumed.
- *
- * The 3945 operates with six queues:  One receive queue, one transmit queue
- * (#4) for sending commands to the device firmware, and four transmit queues
- * (#0-3) for data tx via EDCA.  An additional 2 HCCA queues are unused.
- ***************************************************/
-
-/**
- * iwl3945_queue_init - Initialize queue's high/low-water and read/write indexes
- */
-static int iwl3945_queue_init(struct iwl_priv *priv, struct iwl_queue *q,
-                          int count, int slots_num, u32 id)
-{
-        q->n_bd = count;
-        q->n_window = slots_num;
-        q->id = id;
-
-        /* count must be power-of-two size, otherwise iwl_queue_inc_wrap
-         * and iwl_queue_dec_wrap are broken. */
-        BUG_ON(!is_power_of_2(count));
-
-        /* slots_num must be power-of-two size, otherwise
-         * get_cmd_index is broken. */
-        BUG_ON(!is_power_of_2(slots_num));
-
-        q->low_mark = q->n_window / 4;
-        if (q->low_mark < 4)
-                q->low_mark = 4;
-
-        q->high_mark = q->n_window / 8;
-        if (q->high_mark < 2)
-                q->high_mark = 2;
-
-        q->write_ptr = q->read_ptr = 0;
-
-        return 0;
-}
-
-/**
- * iwl3945_tx_queue_alloc - Alloc driver data and TFD CB for one Tx/cmd queue
- */
-static int iwl3945_tx_queue_alloc(struct iwl_priv *priv,
-                              struct iwl_tx_queue *txq, u32 id)
-{
-        struct pci_dev *dev = priv->pci_dev;
-
-        /* Driver private data, only for Tx (not command) queues,
-         * not shared with device. */
-        if (id != IWL_CMD_QUEUE_NUM) {
-                txq->txb = kmalloc(sizeof(txq->txb[0]) *
-                                   TFD_QUEUE_SIZE_MAX, GFP_KERNEL);
-                if (!txq->txb) {
-                        IWL_ERR(priv, "kmalloc for auxiliary BD "
-                                  "structures failed\n");
-                        goto error;
-                }
-        } else
-                txq->txb = NULL;
-
-        /* Circular buffer of transmit frame descriptors (TFDs),
-         * shared with device */
-        txq->tfds = pci_alloc_consistent(dev,
-                                sizeof(struct iwl3945_tfd) * TFD_QUEUE_SIZE_MAX,
-                                &txq->q.dma_addr);
-
-        if (!txq->tfds) {
-                IWL_ERR(priv, "pci_alloc_consistent(%zd) failed\n",
-                          sizeof(struct iwl3945_tfd) * TFD_QUEUE_SIZE_MAX);
-                goto error;
-        }
-        txq->q.id = id;
-
-        return 0;
-
- error:
-        kfree(txq->txb);
-        txq->txb = NULL;
-
-        return -ENOMEM;
-}
-
-/**
- * iwl3945_tx_queue_init - Allocate and initialize one tx/cmd queue
- */
-int iwl3945_tx_queue_init(struct iwl_priv *priv,
-                      struct iwl_tx_queue *txq, int slots_num, u32 txq_id)
-{
-        int len, i;
-        int rc = 0;
-
-        /*
-         * Alloc buffer array for commands (Tx or other types of commands).
-         * For the command queue (#4), allocate command space + one big
-         * command for scan, since scan command is very huge; the system will
-         * not have two scans at the same time, so only one is needed.
-         * For data Tx queues (all other queues), no super-size command
-         * space is needed.
-         */
-        len = sizeof(struct iwl_cmd);
-        for (i = 0; i <= slots_num; i++) {
-                if (i == slots_num) {
-                        if (txq_id == IWL_CMD_QUEUE_NUM)
-                                len += IWL_MAX_SCAN_SIZE;
-                        else
-                                continue;
-                }
-
-                txq->cmd[i] = kmalloc(len, GFP_KERNEL);
-                if (!txq->cmd[i])
-                        goto err;
-        }
-
-        /* Alloc driver data array and TFD circular buffer */
-        rc = iwl3945_tx_queue_alloc(priv, txq, txq_id);
-        if (rc)
-                goto err;
-
-        txq->need_update = 0;
-
-        /* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
-         * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
-        BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
-
-        /* Initialize queue high/low-water, head/tail indexes */
-        iwl3945_queue_init(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num, txq_id);
-
-        /* Tell device where to find queue, enable DMA channel. */
-        iwl3945_hw_tx_queue_init(priv, txq);
-
-        return 0;
-err:
-        for (i = 0; i < slots_num; i++) {
-                kfree(txq->cmd[i]);
-                txq->cmd[i] = NULL;
-        }
-
-        if (txq_id == IWL_CMD_QUEUE_NUM) {
-                kfree(txq->cmd[slots_num]);
-                txq->cmd[slots_num] = NULL;
-        }
-        return -ENOMEM;
-}
-
-/**
- * iwl3945_tx_queue_free - Deallocate DMA queue.
- * @txq: Transmit queue to deallocate.
- *
- * Empty queue by removing and destroying all BD's.
- * Free all buffers.
- * 0-fill, but do not free "txq" descriptor structure.
- */
-void iwl3945_tx_queue_free(struct iwl_priv *priv, struct iwl_tx_queue *txq)
-{
-        struct iwl_queue *q = &txq->q;
-        struct pci_dev *dev = priv->pci_dev;
-        int len, i;
-
-        if (q->n_bd == 0)
-                return;
-
-        /* first, empty all BD's */
-        for (; q->write_ptr != q->read_ptr;
-             q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd))
-                priv->cfg->ops->lib->txq_free_tfd(priv, txq);
-
-        len = sizeof(struct iwl_cmd) * q->n_window;
-        if (q->id == IWL_CMD_QUEUE_NUM)
-                len += IWL_MAX_SCAN_SIZE;
-
-        /* De-alloc array of command/tx buffers */
-        for (i = 0; i < TFD_TX_CMD_SLOTS; i++)
-                kfree(txq->cmd[i]);
-
-        /* De-alloc circular buffer of TFDs */
-        if (txq->q.n_bd)
-                pci_free_consistent(dev, sizeof(struct iwl3945_tfd) *
-                                    txq->q.n_bd, txq->tfds, txq->q.dma_addr);
-
-        /* De-alloc array of per-TFD driver data */
-        kfree(txq->txb);
-        txq->txb = NULL;
-
-        /* 0-fill queue descriptor structure */
-        memset(txq, 0, sizeof(*txq));
-}
-
 /*************** STATION TABLE MANAGEMENT ****
  * mac80211 should be examined to determine if sta_info is duplicating
  * the functionality provided here