iwlagn: move tx transport functions to iwl-trans-tx-pcie.c

There are still a few functions here and there that should be
put in the transport layer. Mainly the functions that are related to the reclaim flow.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

1 files changed, 808 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-tx-pcie.c b/drivers/net/wireless/iwlwifi/iwl-trans-tx-pcie.c
new file mode 100644
index 000000000000..f3b531b34475
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-tx-pcie.c
@@ -0,0 +1,808 @@
+/******************************************************************************
+ *
+ * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
+ *
+ * Portions of this file are derived from the ipw3945 project, as well
+ * as portions of the ieee80211 subsystem header files.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called LICENSE.
+ *
+ * Contact Information:
+ *  Intel Linux Wireless <ilw@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ *****************************************************************************/
+#include <linux/etherdevice.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <net/mac80211.h>
+
+#include "iwl-agn.h"
+#include "iwl-dev.h"
+#include "iwl-core.h"
+#include "iwl-io.h"
+#include "iwl-helpers.h"
+#include "iwl-trans-int-pcie.h"
+
+/**
+ * iwl_txq_update_write_ptr - Send new write index to hardware
+ */
+void iwl_txq_update_write_ptr(struct iwl_priv *priv, struct iwl_tx_queue *txq)
+{
+        u32 reg = 0;
+        int txq_id = txq->q.id;
+
+        if (txq->need_update == 0)
+                return;
+
+        if (priv->cfg->base_params->shadow_reg_enable) {
+                /* shadow register enabled */
+                iwl_write32(priv, HBUS_TARG_WRPTR,
+                            txq->q.write_ptr | (txq_id << 8));
+        } else {
+                /* if we're trying to save power */
+                if (test_bit(STATUS_POWER_PMI, &priv->status)) {
+                        /* wake up nic if it's powered down ...
+                         * uCode will wake up, and interrupt us again, so next
+                         * time we'll skip this part. */
+                        reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
+
+                        if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
+                                IWL_DEBUG_INFO(priv,
+                                        "Tx queue %d requesting wakeup,"
+                                        " GP1 = 0x%x\n", txq_id, reg);
+                                iwl_set_bit(priv, CSR_GP_CNTRL,
+                                        CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
+                                return;
+                        }
+
+                        iwl_write_direct32(priv, HBUS_TARG_WRPTR,
+                                     txq->q.write_ptr | (txq_id << 8));
+
+                /*
+                 * else not in power-save mode,
+                 * uCode will never sleep when we're
+                 * trying to tx (during RFKILL, we're not trying to tx).
+                 */
+                } else
+                        iwl_write32(priv, HBUS_TARG_WRPTR,
+                                    txq->q.write_ptr | (txq_id << 8));
+        }
+        txq->need_update = 0;
+}
+
+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;
+}
+
+static void iwlagn_unmap_tfd(struct iwl_priv *priv, struct iwl_cmd_meta *meta,
+                     struct iwl_tfd *tfd, enum dma_data_direction dma_dir)
+{
+        int i;
+        int num_tbs;
+
+        /* 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)
+                dma_unmap_single(priv->bus.dev,
+                                dma_unmap_addr(meta, mapping),
+                                dma_unmap_len(meta, len),
+                                DMA_BIDIRECTIONAL);
+
+        /* Unmap chunks, if any. */
+        for (i = 1; i < num_tbs; i++)
+                dma_unmap_single(priv->bus.dev, iwl_tfd_tb_get_addr(tfd, i),
+                                iwl_tfd_tb_get_len(tfd, i), dma_dir);
+}
+
+/**
+ * iwlagn_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
+ * @priv - driver private data
+ * @txq - tx queue
+ * @index - the index of the TFD to be freed
+ *
+ * Does NOT advance any TFD circular buffer read/write indexes
+ * Does NOT free the TFD itself (which is within circular buffer)
+ */
+void iwlagn_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq,
+        int index)
+{
+        struct iwl_tfd *tfd_tmp = txq->tfds;
+
+        iwlagn_unmap_tfd(priv, &txq->meta[index], &tfd_tmp[index],
+                         DMA_TO_DEVICE);
+
+        /* free SKB */
+        if (txq->txb) {
+                struct sk_buff *skb;
+
+                skb = txq->txb[index].skb;
+
+                /* can be called from irqs-disabled context */
+                if (skb) {
+                        dev_kfree_skb_any(skb);
+                        txq->txb[index].skb = NULL;
+                }
+        }
+}
+
+int iwlagn_txq_attach_buf_to_tfd(struct iwl_priv *priv,
+                                 struct iwl_tx_queue *txq,
+                                 dma_addr_t addr, u16 len,
+                                 u8 reset)
+{
+        struct iwl_queue *q;
+        struct iwl_tfd *tfd, *tfd_tmp;
+        u32 num_tbs;
+
+        q = &txq->q;
+        tfd_tmp = txq->tfds;
+        tfd = &tfd_tmp[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;
+        }
+
+        if (WARN_ON(addr & ~DMA_BIT_MASK(36)))
+                return -EINVAL;
+
+        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;
+}
+
+/*************** 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.
+ *
+ ***************************************************/
+
+int iwl_queue_space(const struct iwl_queue *q)
+{
+        int s = q->read_ptr - q->write_ptr;
+
+        if (q->read_ptr > q->write_ptr)
+                s -= q->n_bd;
+
+        if (s <= 0)
+                s += q->n_window;
+        /* keep some reserve to not confuse empty and full situations */
+        s -= 2;
+        if (s < 0)
+                s = 0;
+        return s;
+}
+
+/**
+ * iwl_queue_init - Initialize queue's high/low-water and read/write indexes
+ */
+int iwl_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. */
+        if (WARN_ON(!is_power_of_2(count)))
+                return -EINVAL;
+
+        /* slots_num must be power-of-two size, otherwise
+         * get_cmd_index is broken. */
+        if (WARN_ON(!is_power_of_2(slots_num)))
+                return -EINVAL;
+
+        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;
+}
+
+/*************** HOST COMMAND QUEUE FUNCTIONS   *****/
+
+/**
+ * iwl_enqueue_hcmd - enqueue a uCode command
+ * @priv: device private data point
+ * @cmd: a point to the ucode command structure
+ *
+ * The function returns < 0 values to indicate the operation is
+ * failed. On success, it turns the index (> 0) of command in the
+ * command queue.
+ */
+static int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
+{
+        struct iwl_tx_queue *txq = &priv->txq[priv->cmd_queue];
+        struct iwl_queue *q = &txq->q;
+        struct iwl_device_cmd *out_cmd;
+        struct iwl_cmd_meta *out_meta;
+        dma_addr_t phys_addr;
+        unsigned long flags;
+        u32 idx;
+        u16 copy_size, cmd_size;
+        bool is_ct_kill = false;
+        bool had_nocopy = false;
+        int i;
+        u8 *cmd_dest;
+#ifdef CONFIG_IWLWIFI_DEVICE_TRACING
+        const void *trace_bufs[IWL_MAX_CMD_TFDS + 1] = {};
+        int trace_lens[IWL_MAX_CMD_TFDS + 1] = {};
+        int trace_idx;
+#endif
+
+        if (test_bit(STATUS_FW_ERROR, &priv->status)) {
+                IWL_WARN(priv, "fw recovery, no hcmd send\n");
+                return -EIO;
+        }
+
+        if ((priv->ucode_owner == IWL_OWNERSHIP_TM) &&
+            !(cmd->flags & CMD_ON_DEMAND)) {
+                IWL_DEBUG_HC(priv, "tm own the uCode, no regular hcmd send\n");
+                return -EIO;
+        }
+
+        copy_size = sizeof(out_cmd->hdr);
+        cmd_size = sizeof(out_cmd->hdr);
+
+        /* need one for the header if the first is NOCOPY */
+        BUILD_BUG_ON(IWL_MAX_CMD_TFDS > IWL_NUM_OF_TBS - 1);
+
+        for (i = 0; i < IWL_MAX_CMD_TFDS; i++) {
+                if (!cmd->len[i])
+                        continue;
+                if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
+                        had_nocopy = true;
+                } else {
+                        /* NOCOPY must not be followed by normal! */
+                        if (WARN_ON(had_nocopy))
+                                return -EINVAL;
+                        copy_size += cmd->len[i];
+                }
+                cmd_size += cmd->len[i];
+        }
+
+        /*
+         * If any of the command structures end up being larger than
+         * the TFD_MAX_PAYLOAD_SIZE and they aren't dynamically
+         * allocated into separate TFDs, then we will need to
+         * increase the size of the buffers.
+         */
+        if (WARN_ON(copy_size > TFD_MAX_PAYLOAD_SIZE))
+                return -EINVAL;
+
+        if (iwl_is_rfkill(priv) || iwl_is_ctkill(priv)) {
+                IWL_WARN(priv, "Not sending command - %s KILL\n",
+                         iwl_is_rfkill(priv) ? "RF" : "CT");
+                return -EIO;
+        }
+
+        spin_lock_irqsave(&priv->hcmd_lock, flags);
+
+        if (iwl_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
+                spin_unlock_irqrestore(&priv->hcmd_lock, flags);
+
+                IWL_ERR(priv, "No space in command queue\n");
+                is_ct_kill = iwl_check_for_ct_kill(priv);
+                if (!is_ct_kill) {
+                        IWL_ERR(priv, "Restarting adapter due to queue full\n");
+                        iwlagn_fw_error(priv, false);
+                }
+                return -ENOSPC;
+        }
+
+        idx = get_cmd_index(q, q->write_ptr);
+        out_cmd = txq->cmd[idx];
+        out_meta = &txq->meta[idx];
+
+        memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */
+        if (cmd->flags & CMD_WANT_SKB)
+                out_meta->source = cmd;
+        if (cmd->flags & CMD_ASYNC)
+                out_meta->callback = cmd->callback;
+
+        /* set up the header */
+
+        out_cmd->hdr.cmd = cmd->id;
+        out_cmd->hdr.flags = 0;
+        out_cmd->hdr.sequence = cpu_to_le16(QUEUE_TO_SEQ(priv->cmd_queue) |
+                                            INDEX_TO_SEQ(q->write_ptr));
+
+        /* and copy the data that needs to be copied */
+
+        cmd_dest = &out_cmd->cmd.payload[0];
+        for (i = 0; i < IWL_MAX_CMD_TFDS; i++) {
+                if (!cmd->len[i])
+                        continue;
+                if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY)
+                        break;
+                memcpy(cmd_dest, cmd->data[i], cmd->len[i]);
+                cmd_dest += cmd->len[i];
+        }
+
+        IWL_DEBUG_HC(priv, "Sending command %s (#%x), seq: 0x%04X, "
+                        "%d bytes at %d[%d]:%d\n",
+                        get_cmd_string(out_cmd->hdr.cmd),
+                        out_cmd->hdr.cmd,
+                        le16_to_cpu(out_cmd->hdr.sequence), cmd_size,
+                        q->write_ptr, idx, priv->cmd_queue);
+
+        phys_addr = dma_map_single(priv->bus.dev, &out_cmd->hdr, copy_size,
+                                DMA_BIDIRECTIONAL);
+        if (unlikely(dma_mapping_error(priv->bus.dev, phys_addr))) {
+                idx = -ENOMEM;
+                goto out;
+        }
+
+        dma_unmap_addr_set(out_meta, mapping, phys_addr);
+        dma_unmap_len_set(out_meta, len, copy_size);
+
+        iwlagn_txq_attach_buf_to_tfd(priv, txq, phys_addr, copy_size, 1);
+#ifdef CONFIG_IWLWIFI_DEVICE_TRACING
+        trace_bufs[0] = &out_cmd->hdr;
+        trace_lens[0] = copy_size;
+        trace_idx = 1;
+#endif
+
+        for (i = 0; i < IWL_MAX_CMD_TFDS; i++) {
+                if (!cmd->len[i])
+                        continue;
+                if (!(cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY))
+                        continue;
+                phys_addr = dma_map_single(priv->bus.dev, (void *)cmd->data[i],
+                                           cmd->len[i], DMA_BIDIRECTIONAL);
+                if (dma_mapping_error(priv->bus.dev, phys_addr)) {
+                        iwlagn_unmap_tfd(priv, out_meta,
+                                         &txq->tfds[q->write_ptr],
+                                         DMA_BIDIRECTIONAL);
+                        idx = -ENOMEM;
+                        goto out;
+                }
+
+                iwlagn_txq_attach_buf_to_tfd(priv, txq, phys_addr,
+                                             cmd->len[i], 0);
+#ifdef CONFIG_IWLWIFI_DEVICE_TRACING
+                trace_bufs[trace_idx] = cmd->data[i];
+                trace_lens[trace_idx] = cmd->len[i];
+                trace_idx++;
+#endif
+        }
+
+        out_meta->flags = cmd->flags;
+
+        txq->need_update = 1;
+
+        /* check that tracing gets all possible blocks */
+        BUILD_BUG_ON(IWL_MAX_CMD_TFDS + 1 != 3);
+#ifdef CONFIG_IWLWIFI_DEVICE_TRACING
+        trace_iwlwifi_dev_hcmd(priv, cmd->flags,
+                               trace_bufs[0], trace_lens[0],
+                               trace_bufs[1], trace_lens[1],
+                               trace_bufs[2], trace_lens[2]);
+#endif
+
+        /* Increment and update queue's write index */
+        q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
+        iwl_txq_update_write_ptr(priv, txq);
+
+ out:
+        spin_unlock_irqrestore(&priv->hcmd_lock, flags);
+        return idx;
+}
+
+/**
+ * iwl_hcmd_queue_reclaim - Reclaim TX command queue entries already Tx'd
+ *
+ * When FW advances 'R' index, all entries between old and new 'R' index
+ * need to be reclaimed. As result, some free space forms.  If there is
+ * enough free space (> low mark), wake the stack that feeds us.
+ */
+static void iwl_hcmd_queue_reclaim(struct iwl_priv *priv, int txq_id, int idx)
+{
+        struct iwl_tx_queue *txq = &priv->txq[txq_id];
+        struct iwl_queue *q = &txq->q;
+        int nfreed = 0;
+
+        if ((idx >= q->n_bd) || (iwl_queue_used(q, idx) == 0)) {
+                IWL_ERR(priv, "%s: Read index for DMA queue txq id (%d), "
+                          "index %d is out of range [0-%d] %d %d.\n", __func__,
+                          txq_id, idx, q->n_bd, q->write_ptr, q->read_ptr);
+                return;
+        }
+
+        for (idx = iwl_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx;
+             q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
+
+                if (nfreed++ > 0) {
+                        IWL_ERR(priv, "HCMD skipped: index (%d) %d %d\n", idx,
+                                        q->write_ptr, q->read_ptr);
+                        iwlagn_fw_error(priv, false);
+                }
+
+        }
+}
+
+/**
+ * iwl_tx_cmd_complete - Pull unused buffers off the queue and reclaim them
+ * @rxb: Rx buffer to reclaim
+ *
+ * If an Rx buffer has an async callback associated with it the callback
+ * will be executed.  The attached skb (if present) will only be freed
+ * if the callback returns 1
+ */
+void iwl_tx_cmd_complete(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
+{
+        struct iwl_rx_packet *pkt = rxb_addr(rxb);
+        u16 sequence = le16_to_cpu(pkt->hdr.sequence);
+        int txq_id = SEQ_TO_QUEUE(sequence);
+        int index = SEQ_TO_INDEX(sequence);
+        int cmd_index;
+        struct iwl_device_cmd *cmd;
+        struct iwl_cmd_meta *meta;
+        struct iwl_tx_queue *txq = &priv->txq[priv->cmd_queue];
+        unsigned long flags;
+
+        /* If a Tx command is being handled and it isn't in the actual
+         * command queue then there a command routing bug has been introduced
+         * in the queue management code. */
+        if (WARN(txq_id != priv->cmd_queue,
+                 "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
+                  txq_id, priv->cmd_queue, sequence,
+                  priv->txq[priv->cmd_queue].q.read_ptr,
+                  priv->txq[priv->cmd_queue].q.write_ptr)) {
+                iwl_print_hex_error(priv, pkt, 32);
+                return;
+        }
+
+        cmd_index = get_cmd_index(&txq->q, index);
+        cmd = txq->cmd[cmd_index];
+        meta = &txq->meta[cmd_index];
+
+        iwlagn_unmap_tfd(priv, meta, &txq->tfds[index], DMA_BIDIRECTIONAL);
+
+        /* Input error checking is done when commands are added to queue. */
+        if (meta->flags & CMD_WANT_SKB) {
+                meta->source->reply_page = (unsigned long)rxb_addr(rxb);
+                rxb->page = NULL;
+        } else if (meta->callback)
+                meta->callback(priv, cmd, pkt);
+
+        spin_lock_irqsave(&priv->hcmd_lock, flags);
+
+        iwl_hcmd_queue_reclaim(priv, txq_id, index);
+
+        if (!(meta->flags & CMD_ASYNC)) {
+                clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
+                IWL_DEBUG_INFO(priv, "Clearing HCMD_ACTIVE for command %s\n",
+                               get_cmd_string(cmd->hdr.cmd));
+                wake_up_interruptible(&priv->wait_command_queue);
+        }
+
+        meta->flags = 0;
+
+        spin_unlock_irqrestore(&priv->hcmd_lock, flags);
+}
+
+const char *get_cmd_string(u8 cmd)
+{
+        switch (cmd) {
+                IWL_CMD(REPLY_ALIVE);
+                IWL_CMD(REPLY_ERROR);
+                IWL_CMD(REPLY_RXON);
+                IWL_CMD(REPLY_RXON_ASSOC);
+                IWL_CMD(REPLY_QOS_PARAM);
+                IWL_CMD(REPLY_RXON_TIMING);
+                IWL_CMD(REPLY_ADD_STA);
+                IWL_CMD(REPLY_REMOVE_STA);
+                IWL_CMD(REPLY_REMOVE_ALL_STA);
+                IWL_CMD(REPLY_TXFIFO_FLUSH);
+                IWL_CMD(REPLY_WEPKEY);
+                IWL_CMD(REPLY_TX);
+                IWL_CMD(REPLY_LEDS_CMD);
+                IWL_CMD(REPLY_TX_LINK_QUALITY_CMD);
+                IWL_CMD(COEX_PRIORITY_TABLE_CMD);
+                IWL_CMD(COEX_MEDIUM_NOTIFICATION);
+                IWL_CMD(COEX_EVENT_CMD);
+                IWL_CMD(REPLY_QUIET_CMD);
+                IWL_CMD(REPLY_CHANNEL_SWITCH);
+                IWL_CMD(CHANNEL_SWITCH_NOTIFICATION);
+                IWL_CMD(REPLY_SPECTRUM_MEASUREMENT_CMD);
+                IWL_CMD(SPECTRUM_MEASURE_NOTIFICATION);
+                IWL_CMD(POWER_TABLE_CMD);
+                IWL_CMD(PM_SLEEP_NOTIFICATION);
+                IWL_CMD(PM_DEBUG_STATISTIC_NOTIFIC);
+                IWL_CMD(REPLY_SCAN_CMD);
+                IWL_CMD(REPLY_SCAN_ABORT_CMD);
+                IWL_CMD(SCAN_START_NOTIFICATION);
+                IWL_CMD(SCAN_RESULTS_NOTIFICATION);
+                IWL_CMD(SCAN_COMPLETE_NOTIFICATION);
+                IWL_CMD(BEACON_NOTIFICATION);
+                IWL_CMD(REPLY_TX_BEACON);
+                IWL_CMD(WHO_IS_AWAKE_NOTIFICATION);
+                IWL_CMD(QUIET_NOTIFICATION);
+                IWL_CMD(REPLY_TX_PWR_TABLE_CMD);
+                IWL_CMD(MEASURE_ABORT_NOTIFICATION);
+                IWL_CMD(REPLY_BT_CONFIG);
+                IWL_CMD(REPLY_STATISTICS_CMD);
+                IWL_CMD(STATISTICS_NOTIFICATION);
+                IWL_CMD(REPLY_CARD_STATE_CMD);
+                IWL_CMD(CARD_STATE_NOTIFICATION);
+                IWL_CMD(MISSED_BEACONS_NOTIFICATION);
+                IWL_CMD(REPLY_CT_KILL_CONFIG_CMD);
+                IWL_CMD(SENSITIVITY_CMD);
+                IWL_CMD(REPLY_PHY_CALIBRATION_CMD);
+                IWL_CMD(REPLY_RX_PHY_CMD);
+                IWL_CMD(REPLY_RX_MPDU_CMD);
+                IWL_CMD(REPLY_RX);
+                IWL_CMD(REPLY_COMPRESSED_BA);
+                IWL_CMD(CALIBRATION_CFG_CMD);
+                IWL_CMD(CALIBRATION_RES_NOTIFICATION);
+                IWL_CMD(CALIBRATION_COMPLETE_NOTIFICATION);
+                IWL_CMD(REPLY_TX_POWER_DBM_CMD);
+                IWL_CMD(TEMPERATURE_NOTIFICATION);
+                IWL_CMD(TX_ANT_CONFIGURATION_CMD);
+                IWL_CMD(REPLY_BT_COEX_PROFILE_NOTIF);
+                IWL_CMD(REPLY_BT_COEX_PRIO_TABLE);
+                IWL_CMD(REPLY_BT_COEX_PROT_ENV);
+                IWL_CMD(REPLY_WIPAN_PARAMS);
+                IWL_CMD(REPLY_WIPAN_RXON);
+                IWL_CMD(REPLY_WIPAN_RXON_TIMING);
+                IWL_CMD(REPLY_WIPAN_RXON_ASSOC);
+                IWL_CMD(REPLY_WIPAN_QOS_PARAM);
+                IWL_CMD(REPLY_WIPAN_WEPKEY);
+                IWL_CMD(REPLY_WIPAN_P2P_CHANNEL_SWITCH);
+                IWL_CMD(REPLY_WIPAN_NOA_NOTIFICATION);
+                IWL_CMD(REPLY_WIPAN_DEACTIVATION_COMPLETE);
+        default:
+                return "UNKNOWN";
+
+        }
+}
+
+#define HOST_COMPLETE_TIMEOUT (2 * HZ)
+
+static void iwl_generic_cmd_callback(struct iwl_priv *priv,
+                                     struct iwl_device_cmd *cmd,
+                                     struct iwl_rx_packet *pkt)
+{
+        if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
+                IWL_ERR(priv, "Bad return from %s (0x%08X)\n",
+                        get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
+                return;
+        }
+
+#ifdef CONFIG_IWLWIFI_DEBUG
+        switch (cmd->hdr.cmd) {
+        case REPLY_TX_LINK_QUALITY_CMD:
+        case SENSITIVITY_CMD:
+                IWL_DEBUG_HC_DUMP(priv, "back from %s (0x%08X)\n",
+                                get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
+                break;
+        default:
+                IWL_DEBUG_HC(priv, "back from %s (0x%08X)\n",
+                                get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
+        }
+#endif
+}
+
+static int iwl_send_cmd_async(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
+{
+        int ret;
+
+        /* An asynchronous command can not expect an SKB to be set. */
+        if (WARN_ON(cmd->flags & CMD_WANT_SKB))
+                return -EINVAL;
+
+        /* Assign a generic callback if one is not provided */
+        if (!cmd->callback)
+                cmd->callback = iwl_generic_cmd_callback;
+
+        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
+                return -EBUSY;
+
+        ret = iwl_enqueue_hcmd(priv, cmd);
+        if (ret < 0) {
+                IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
+                          get_cmd_string(cmd->id), ret);
+                return ret;
+        }
+        return 0;
+}
+
+static int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
+{
+        int cmd_idx;
+        int ret;
+
+        lockdep_assert_held(&priv->mutex);
+
+         /* A synchronous command can not have a callback set. */
+        if (WARN_ON(cmd->callback))
+                return -EINVAL;
+
+        IWL_DEBUG_INFO(priv, "Attempting to send sync command %s\n",
+                        get_cmd_string(cmd->id));
+
+        set_bit(STATUS_HCMD_ACTIVE, &priv->status);
+        IWL_DEBUG_INFO(priv, "Setting HCMD_ACTIVE for command %s\n",
+                        get_cmd_string(cmd->id));
+
+        cmd_idx = iwl_enqueue_hcmd(priv, cmd);
+        if (cmd_idx < 0) {
+                ret = cmd_idx;
+                clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
+                IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
+                          get_cmd_string(cmd->id), ret);
+                return ret;
+        }
+
+        ret = wait_event_interruptible_timeout(priv->wait_command_queue,
+                        !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
+                        HOST_COMPLETE_TIMEOUT);
+        if (!ret) {
+                if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
+                        IWL_ERR(priv,
+                                "Error sending %s: time out after %dms.\n",
+                                get_cmd_string(cmd->id),
+                                jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
+
+                        clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
+                        IWL_DEBUG_INFO(priv, "Clearing HCMD_ACTIVE for command"
+                                 "%s\n", get_cmd_string(cmd->id));
+                        ret = -ETIMEDOUT;
+                        goto cancel;
+                }
+        }
+
+        if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
+                IWL_ERR(priv, "Command %s aborted: RF KILL Switch\n",
+                               get_cmd_string(cmd->id));
+                ret = -ECANCELED;
+                goto fail;
+        }
+        if (test_bit(STATUS_FW_ERROR, &priv->status)) {
+                IWL_ERR(priv, "Command %s failed: FW Error\n",
+                               get_cmd_string(cmd->id));
+                ret = -EIO;
+                goto fail;
+        }
+        if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) {
+                IWL_ERR(priv, "Error: Response NULL in '%s'\n",
+                          get_cmd_string(cmd->id));
+                ret = -EIO;
+                goto cancel;
+        }
+
+        return 0;
+
+cancel:
+        if (cmd->flags & CMD_WANT_SKB) {
+                /*
+                 * Cancel the CMD_WANT_SKB flag for the cmd in the
+                 * TX cmd queue. Otherwise in case the cmd comes
+                 * in later, it will possibly set an invalid
+                 * address (cmd->meta.source).
+                 */
+                priv->txq[priv->cmd_queue].meta[cmd_idx].flags &=
+                                                        ~CMD_WANT_SKB;
+        }
+fail:
+        if (cmd->reply_page) {
+                iwl_free_pages(priv, cmd->reply_page);
+                cmd->reply_page = 0;
+        }
+
+        return ret;
+}
+
+int iwl_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
+{
+        if (cmd->flags & CMD_ASYNC)
+                return iwl_send_cmd_async(priv, cmd);
+
+        return iwl_send_cmd_sync(priv, cmd);
+}
+
+int iwl_send_cmd_pdu(struct iwl_priv *priv, u8 id, u32 flags, u16 len,
+                     const void *data)
+{
+        struct iwl_host_cmd cmd = {
+                .id = id,
+                .len = { len, },
+                .data = { data, },
+                .flags = flags,
+        };
+
+        return iwl_send_cmd(priv, &cmd);
+}