diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl3945-base.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl3945-base.c | 204 |
1 files changed, 0 insertions, 204 deletions
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 |