1 /******************************************************************************
3 * This file is provided under a dual BSD/GPLv2 license. When using or
4 * redistributing this file, you may do so under either license.
8 * Copyright(c) 2007 - 2011 Intel Corporation. All rights reserved.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of version 2 of the GNU General Public License as
12 * published by the Free Software Foundation.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
24 * The full GNU General Public License is included in this distribution
25 * in the file called LICENSE.GPL.
27 * Contact Information:
28 * Intel Linux Wireless <ilw@linux.intel.com>
29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
33 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
34 * All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
40 * * Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * * Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in
44 * the documentation and/or other materials provided with the
46 * * Neither the name Intel Corporation nor the names of its
47 * contributors may be used to endorse or promote products derived
48 * from this software without specific prior written permission.
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
62 *****************************************************************************/
64 #include "iwl-trans.h"
66 #include "iwl-helpers.h"
67 #include "iwl-trans-int-pcie.h"
68 /*TODO remove uneeded includes when the transport layer tx_free will be here */
71 #include "iwl-shared.h"
73 static int iwl_trans_rx_alloc(struct iwl_priv *priv)
75 struct iwl_rx_queue *rxq = &priv->rxq;
76 struct device *dev = priv->bus->dev;
78 memset(&priv->rxq, 0, sizeof(priv->rxq));
80 spin_lock_init(&rxq->lock);
81 INIT_LIST_HEAD(&rxq->rx_free);
82 INIT_LIST_HEAD(&rxq->rx_used);
84 if (WARN_ON(rxq->bd || rxq->rb_stts))
87 /* Allocate the circular buffer of Read Buffer Descriptors (RBDs) */
88 rxq->bd = dma_alloc_coherent(dev, sizeof(__le32) * RX_QUEUE_SIZE,
89 &rxq->bd_dma, GFP_KERNEL);
92 memset(rxq->bd, 0, sizeof(__le32) * RX_QUEUE_SIZE);
94 /*Allocate the driver's pointer to receive buffer status */
95 rxq->rb_stts = dma_alloc_coherent(dev, sizeof(*rxq->rb_stts),
96 &rxq->rb_stts_dma, GFP_KERNEL);
99 memset(rxq->rb_stts, 0, sizeof(*rxq->rb_stts));
104 dma_free_coherent(dev, sizeof(__le32) * RX_QUEUE_SIZE,
105 rxq->bd, rxq->bd_dma);
106 memset(&rxq->bd_dma, 0, sizeof(rxq->bd_dma));
112 static void iwl_trans_rxq_free_rx_bufs(struct iwl_priv *priv)
114 struct iwl_rx_queue *rxq = &priv->rxq;
117 /* Fill the rx_used queue with _all_ of the Rx buffers */
118 for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
119 /* In the reset function, these buffers may have been allocated
120 * to an SKB, so we need to unmap and free potential storage */
121 if (rxq->pool[i].page != NULL) {
122 dma_unmap_page(priv->bus->dev, rxq->pool[i].page_dma,
123 PAGE_SIZE << hw_params(priv).rx_page_order,
125 __iwl_free_pages(priv, rxq->pool[i].page);
126 rxq->pool[i].page = NULL;
128 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
132 static void iwl_trans_rx_hw_init(struct iwl_priv *priv,
133 struct iwl_rx_queue *rxq)
136 const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
137 u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
139 rb_timeout = RX_RB_TIMEOUT;
141 if (iwlagn_mod_params.amsdu_size_8K)
142 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
144 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
147 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
149 /* Reset driver's Rx queue write index */
150 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
152 /* Tell device where to find RBD circular buffer in DRAM */
153 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
154 (u32)(rxq->bd_dma >> 8));
156 /* Tell device where in DRAM to update its Rx status */
157 iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
158 rxq->rb_stts_dma >> 4);
161 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
162 * the credit mechanism in 5000 HW RX FIFO
163 * Direct rx interrupts to hosts
164 * Rx buffer size 4 or 8k
168 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
169 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
170 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
171 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
172 FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
174 (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
175 (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
177 /* Set interrupt coalescing timer to default (2048 usecs) */
178 iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF);
181 static int iwl_rx_init(struct iwl_priv *priv)
183 struct iwl_rx_queue *rxq = &priv->rxq;
188 err = iwl_trans_rx_alloc(priv);
193 spin_lock_irqsave(&rxq->lock, flags);
194 INIT_LIST_HEAD(&rxq->rx_free);
195 INIT_LIST_HEAD(&rxq->rx_used);
197 iwl_trans_rxq_free_rx_bufs(priv);
199 for (i = 0; i < RX_QUEUE_SIZE; i++)
200 rxq->queue[i] = NULL;
202 /* Set us so that we have processed and used all buffers, but have
203 * not restocked the Rx queue with fresh buffers */
204 rxq->read = rxq->write = 0;
205 rxq->write_actual = 0;
207 spin_unlock_irqrestore(&rxq->lock, flags);
209 iwlagn_rx_replenish(priv);
211 iwl_trans_rx_hw_init(priv, rxq);
213 spin_lock_irqsave(&priv->lock, flags);
214 rxq->need_update = 1;
215 iwl_rx_queue_update_write_ptr(priv, rxq);
216 spin_unlock_irqrestore(&priv->lock, flags);
221 static void iwl_trans_rx_free(struct iwl_priv *priv)
223 struct iwl_rx_queue *rxq = &priv->rxq;
226 /*if rxq->bd is NULL, it means that nothing has been allocated,
229 IWL_DEBUG_INFO(priv, "Free NULL rx context\n");
233 spin_lock_irqsave(&rxq->lock, flags);
234 iwl_trans_rxq_free_rx_bufs(priv);
235 spin_unlock_irqrestore(&rxq->lock, flags);
237 dma_free_coherent(priv->bus->dev, sizeof(__le32) * RX_QUEUE_SIZE,
238 rxq->bd, rxq->bd_dma);
239 memset(&rxq->bd_dma, 0, sizeof(rxq->bd_dma));
243 dma_free_coherent(priv->bus->dev,
244 sizeof(struct iwl_rb_status),
245 rxq->rb_stts, rxq->rb_stts_dma);
247 IWL_DEBUG_INFO(priv, "Free rxq->rb_stts which is NULL\n");
248 memset(&rxq->rb_stts_dma, 0, sizeof(rxq->rb_stts_dma));
252 static int iwl_trans_rx_stop(struct iwl_priv *priv)
256 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
257 return iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
258 FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
261 static inline int iwlagn_alloc_dma_ptr(struct iwl_priv *priv,
262 struct iwl_dma_ptr *ptr, size_t size)
264 if (WARN_ON(ptr->addr))
267 ptr->addr = dma_alloc_coherent(priv->bus->dev, size,
268 &ptr->dma, GFP_KERNEL);
275 static inline void iwlagn_free_dma_ptr(struct iwl_priv *priv,
276 struct iwl_dma_ptr *ptr)
278 if (unlikely(!ptr->addr))
281 dma_free_coherent(priv->bus->dev, ptr->size, ptr->addr, ptr->dma);
282 memset(ptr, 0, sizeof(*ptr));
285 static int iwl_trans_txq_alloc(struct iwl_priv *priv, struct iwl_tx_queue *txq,
286 int slots_num, u32 txq_id)
288 size_t tfd_sz = hw_params(priv).tfd_size * TFD_QUEUE_SIZE_MAX;
291 if (WARN_ON(txq->meta || txq->cmd || txq->txb || txq->tfds))
294 txq->q.n_window = slots_num;
296 txq->meta = kzalloc(sizeof(txq->meta[0]) * slots_num,
298 txq->cmd = kzalloc(sizeof(txq->cmd[0]) * slots_num,
301 if (!txq->meta || !txq->cmd)
304 for (i = 0; i < slots_num; i++) {
305 txq->cmd[i] = kmalloc(sizeof(struct iwl_device_cmd),
311 /* Alloc driver data array and TFD circular buffer */
312 /* Driver private data, only for Tx (not command) queues,
313 * not shared with device. */
314 if (txq_id != priv->cmd_queue) {
315 txq->txb = kzalloc(sizeof(txq->txb[0]) *
316 TFD_QUEUE_SIZE_MAX, GFP_KERNEL);
318 IWL_ERR(priv, "kmalloc for auxiliary BD "
319 "structures failed\n");
326 /* Circular buffer of transmit frame descriptors (TFDs),
327 * shared with device */
328 txq->tfds = dma_alloc_coherent(priv->bus->dev, tfd_sz, &txq->q.dma_addr,
331 IWL_ERR(priv, "dma_alloc_coherent(%zd) failed\n", tfd_sz);
340 /* since txq->cmd has been zeroed,
341 * all non allocated cmd[i] will be NULL */
343 for (i = 0; i < slots_num; i++)
354 static int iwl_trans_txq_init(struct iwl_priv *priv, struct iwl_tx_queue *txq,
355 int slots_num, u32 txq_id)
359 txq->need_update = 0;
360 memset(txq->meta, 0, sizeof(txq->meta[0]) * slots_num);
363 * For the default queues 0-3, set up the swq_id
364 * already -- all others need to get one later
365 * (if they need one at all).
368 iwl_set_swq_id(txq, txq_id, txq_id);
370 /* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
371 * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
372 BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
374 /* Initialize queue's high/low-water marks, and head/tail indexes */
375 ret = iwl_queue_init(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num,
381 * Tell nic where to find circular buffer of Tx Frame Descriptors for
382 * given Tx queue, and enable the DMA channel used for that queue.
383 * Circular buffer (TFD queue in DRAM) physical base address */
384 iwl_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id),
385 txq->q.dma_addr >> 8);
391 * iwl_tx_queue_unmap - Unmap any remaining DMA mappings and free skb's
393 static void iwl_tx_queue_unmap(struct iwl_priv *priv, int txq_id)
395 struct iwl_tx_queue *txq = &priv->txq[txq_id];
396 struct iwl_queue *q = &txq->q;
401 while (q->write_ptr != q->read_ptr) {
402 /* The read_ptr needs to bound by q->n_window */
403 iwlagn_txq_free_tfd(priv, txq, get_cmd_index(q, q->read_ptr));
404 q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd);
409 * iwl_tx_queue_free - Deallocate DMA queue.
410 * @txq: Transmit queue to deallocate.
412 * Empty queue by removing and destroying all BD's.
414 * 0-fill, but do not free "txq" descriptor structure.
416 static void iwl_tx_queue_free(struct iwl_priv *priv, int txq_id)
418 struct iwl_tx_queue *txq = &priv->txq[txq_id];
419 struct device *dev = priv->bus->dev;
424 iwl_tx_queue_unmap(priv, txq_id);
426 /* De-alloc array of command/tx buffers */
427 for (i = 0; i < txq->q.n_window; i++)
430 /* De-alloc circular buffer of TFDs */
432 dma_free_coherent(dev, hw_params(priv).tfd_size *
433 txq->q.n_bd, txq->tfds, txq->q.dma_addr);
434 memset(&txq->q.dma_addr, 0, sizeof(txq->q.dma_addr));
437 /* De-alloc array of per-TFD driver data */
441 /* deallocate arrays */
447 /* 0-fill queue descriptor structure */
448 memset(txq, 0, sizeof(*txq));
452 * iwl_trans_tx_free - Free TXQ Context
454 * Destroy all TX DMA queues and structures
456 static void iwl_trans_tx_free(struct iwl_priv *priv)
463 txq_id < hw_params(priv).max_txq_num; txq_id++)
464 iwl_tx_queue_free(priv, txq_id);
470 iwlagn_free_dma_ptr(priv, &priv->kw);
472 iwlagn_free_dma_ptr(priv, &priv->scd_bc_tbls);
476 * iwl_trans_tx_alloc - allocate TX context
477 * Allocate all Tx DMA structures and initialize them
482 static int iwl_trans_tx_alloc(struct iwl_priv *priv)
485 int txq_id, slots_num;
487 /*It is not allowed to alloc twice, so warn when this happens.
488 * We cannot rely on the previous allocation, so free and fail */
489 if (WARN_ON(priv->txq)) {
494 ret = iwlagn_alloc_dma_ptr(priv, &priv->scd_bc_tbls,
495 hw_params(priv).scd_bc_tbls_size);
497 IWL_ERR(priv, "Scheduler BC Table allocation failed\n");
501 /* Alloc keep-warm buffer */
502 ret = iwlagn_alloc_dma_ptr(priv, &priv->kw, IWL_KW_SIZE);
504 IWL_ERR(priv, "Keep Warm allocation failed\n");
508 priv->txq = kzalloc(sizeof(struct iwl_tx_queue) *
509 priv->cfg->base_params->num_of_queues, GFP_KERNEL);
511 IWL_ERR(priv, "Not enough memory for txq\n");
516 /* Alloc and init all Tx queues, including the command queue (#4/#9) */
517 for (txq_id = 0; txq_id < hw_params(priv).max_txq_num; txq_id++) {
518 slots_num = (txq_id == priv->cmd_queue) ?
519 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
520 ret = iwl_trans_txq_alloc(priv, &priv->txq[txq_id], slots_num,
523 IWL_ERR(priv, "Tx %d queue alloc failed\n", txq_id);
531 trans_tx_free(&priv->trans);
535 static int iwl_tx_init(struct iwl_priv *priv)
538 int txq_id, slots_num;
543 ret = iwl_trans_tx_alloc(priv);
549 spin_lock_irqsave(&priv->lock, flags);
551 /* Turn off all Tx DMA fifos */
552 iwl_write_prph(priv, SCD_TXFACT, 0);
554 /* Tell NIC where to find the "keep warm" buffer */
555 iwl_write_direct32(priv, FH_KW_MEM_ADDR_REG, priv->kw.dma >> 4);
557 spin_unlock_irqrestore(&priv->lock, flags);
559 /* Alloc and init all Tx queues, including the command queue (#4/#9) */
560 for (txq_id = 0; txq_id < hw_params(priv).max_txq_num; txq_id++) {
561 slots_num = (txq_id == priv->cmd_queue) ?
562 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
563 ret = iwl_trans_txq_init(priv, &priv->txq[txq_id], slots_num,
566 IWL_ERR(priv, "Tx %d queue init failed\n", txq_id);
573 /*Upon error, free only if we allocated something */
575 trans_tx_free(&priv->trans);
579 static void iwl_set_pwr_vmain(struct iwl_priv *priv)
582 * (for documentation purposes)
583 * to set power to V_AUX, do:
585 if (pci_pme_capable(priv->pci_dev, PCI_D3cold))
586 iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
587 APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
588 ~APMG_PS_CTRL_MSK_PWR_SRC);
591 iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
592 APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
593 ~APMG_PS_CTRL_MSK_PWR_SRC);
596 static int iwl_nic_init(struct iwl_priv *priv)
601 spin_lock_irqsave(&priv->lock, flags);
604 /* Set interrupt coalescing calibration timer to default (512 usecs) */
605 iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_CALIB_TIMEOUT_DEF);
607 spin_unlock_irqrestore(&priv->lock, flags);
609 iwl_set_pwr_vmain(priv);
611 priv->cfg->lib->nic_config(priv);
613 /* Allocate the RX queue, or reset if it is already allocated */
616 /* Allocate or reset and init all Tx and Command queues */
617 if (iwl_tx_init(priv))
620 if (priv->cfg->base_params->shadow_reg_enable) {
621 /* enable shadow regs in HW */
622 iwl_set_bit(priv, CSR_MAC_SHADOW_REG_CTRL,
626 set_bit(STATUS_INIT, &priv->status);
631 #define HW_READY_TIMEOUT (50)
633 /* Note: returns poll_bit return value, which is >= 0 if success */
634 static int iwl_set_hw_ready(struct iwl_priv *priv)
638 iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
639 CSR_HW_IF_CONFIG_REG_BIT_NIC_READY);
641 /* See if we got it */
642 ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
643 CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
644 CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
647 IWL_DEBUG_INFO(priv, "hardware%s ready\n", ret < 0 ? " not" : "");
651 /* Note: returns standard 0/-ERROR code */
652 static int iwl_trans_prepare_card_hw(struct iwl_priv *priv)
656 IWL_DEBUG_INFO(priv, "iwl_trans_prepare_card_hw enter\n");
658 ret = iwl_set_hw_ready(priv);
662 /* If HW is not ready, prepare the conditions to check again */
663 iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
664 CSR_HW_IF_CONFIG_REG_PREPARE);
666 ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
667 ~CSR_HW_IF_CONFIG_REG_BIT_NIC_PREPARE_DONE,
668 CSR_HW_IF_CONFIG_REG_BIT_NIC_PREPARE_DONE, 150000);
673 /* HW should be ready by now, check again. */
674 ret = iwl_set_hw_ready(priv);
680 static int iwl_trans_start_device(struct iwl_priv *priv)
684 priv->ucode_owner = IWL_OWNERSHIP_DRIVER;
686 if ((priv->cfg->sku & EEPROM_SKU_CAP_AMT_ENABLE) &&
687 iwl_trans_prepare_card_hw(priv)) {
688 IWL_WARN(priv, "Exit HW not ready\n");
692 /* If platform's RF_KILL switch is NOT set to KILL */
693 if (iwl_read32(priv, CSR_GP_CNTRL) &
694 CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW)
695 clear_bit(STATUS_RF_KILL_HW, &priv->status);
697 set_bit(STATUS_RF_KILL_HW, &priv->status);
699 if (iwl_is_rfkill(priv)) {
700 wiphy_rfkill_set_hw_state(priv->hw->wiphy, true);
701 iwl_enable_interrupts(priv);
705 iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
707 ret = iwl_nic_init(priv);
709 IWL_ERR(priv, "Unable to init nic\n");
713 /* make sure rfkill handshake bits are cleared */
714 iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
715 iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
716 CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
718 /* clear (again), then enable host interrupts */
719 iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
720 iwl_enable_interrupts(priv);
722 /* really make sure rfkill handshake bits are cleared */
723 iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
724 iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
730 * Activate/Deactivate Tx DMA/FIFO channels according tx fifos mask
731 * must be called under priv->lock and mac access
733 static void iwl_trans_txq_set_sched(struct iwl_priv *priv, u32 mask)
735 iwl_write_prph(priv, SCD_TXFACT, mask);
738 #define IWL_AC_UNSET -1
740 struct queue_to_fifo_ac {
744 static const struct queue_to_fifo_ac iwlagn_default_queue_to_tx_fifo[] = {
745 { IWL_TX_FIFO_VO, IEEE80211_AC_VO, },
746 { IWL_TX_FIFO_VI, IEEE80211_AC_VI, },
747 { IWL_TX_FIFO_BE, IEEE80211_AC_BE, },
748 { IWL_TX_FIFO_BK, IEEE80211_AC_BK, },
749 { IWLAGN_CMD_FIFO_NUM, IWL_AC_UNSET, },
750 { IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
751 { IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
752 { IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
753 { IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
754 { IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
755 { IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
758 static const struct queue_to_fifo_ac iwlagn_ipan_queue_to_tx_fifo[] = {
759 { IWL_TX_FIFO_VO, IEEE80211_AC_VO, },
760 { IWL_TX_FIFO_VI, IEEE80211_AC_VI, },
761 { IWL_TX_FIFO_BE, IEEE80211_AC_BE, },
762 { IWL_TX_FIFO_BK, IEEE80211_AC_BK, },
763 { IWL_TX_FIFO_BK_IPAN, IEEE80211_AC_BK, },
764 { IWL_TX_FIFO_BE_IPAN, IEEE80211_AC_BE, },
765 { IWL_TX_FIFO_VI_IPAN, IEEE80211_AC_VI, },
766 { IWL_TX_FIFO_VO_IPAN, IEEE80211_AC_VO, },
767 { IWL_TX_FIFO_BE_IPAN, 2, },
768 { IWLAGN_CMD_FIFO_NUM, IWL_AC_UNSET, },
769 { IWL_TX_FIFO_AUX, IWL_AC_UNSET, },
771 static void iwl_trans_tx_start(struct iwl_priv *priv)
773 const struct queue_to_fifo_ac *queue_to_fifo;
774 struct iwl_rxon_context *ctx;
780 spin_lock_irqsave(&priv->lock, flags);
782 priv->scd_base_addr = iwl_read_prph(priv, SCD_SRAM_BASE_ADDR);
783 a = priv->scd_base_addr + SCD_CONTEXT_MEM_LOWER_BOUND;
784 /* reset conext data memory */
785 for (; a < priv->scd_base_addr + SCD_CONTEXT_MEM_UPPER_BOUND;
787 iwl_write_targ_mem(priv, a, 0);
788 /* reset tx status memory */
789 for (; a < priv->scd_base_addr + SCD_TX_STTS_MEM_UPPER_BOUND;
791 iwl_write_targ_mem(priv, a, 0);
792 for (; a < priv->scd_base_addr +
793 SCD_TRANS_TBL_OFFSET_QUEUE(hw_params(priv).max_txq_num);
795 iwl_write_targ_mem(priv, a, 0);
797 iwl_write_prph(priv, SCD_DRAM_BASE_ADDR,
798 priv->scd_bc_tbls.dma >> 10);
800 /* Enable DMA channel */
801 for (chan = 0; chan < FH_TCSR_CHNL_NUM ; chan++)
802 iwl_write_direct32(priv, FH_TCSR_CHNL_TX_CONFIG_REG(chan),
803 FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
804 FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE);
806 /* Update FH chicken bits */
807 reg_val = iwl_read_direct32(priv, FH_TX_CHICKEN_BITS_REG);
808 iwl_write_direct32(priv, FH_TX_CHICKEN_BITS_REG,
809 reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN);
811 iwl_write_prph(priv, SCD_QUEUECHAIN_SEL,
812 SCD_QUEUECHAIN_SEL_ALL(priv));
813 iwl_write_prph(priv, SCD_AGGR_SEL, 0);
815 /* initiate the queues */
816 for (i = 0; i < hw_params(priv).max_txq_num; i++) {
817 iwl_write_prph(priv, SCD_QUEUE_RDPTR(i), 0);
818 iwl_write_direct32(priv, HBUS_TARG_WRPTR, 0 | (i << 8));
819 iwl_write_targ_mem(priv, priv->scd_base_addr +
820 SCD_CONTEXT_QUEUE_OFFSET(i), 0);
821 iwl_write_targ_mem(priv, priv->scd_base_addr +
822 SCD_CONTEXT_QUEUE_OFFSET(i) +
825 SCD_QUEUE_CTX_REG2_WIN_SIZE_POS) &
826 SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK) |
828 SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
829 SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK));
832 iwl_write_prph(priv, SCD_INTERRUPT_MASK,
833 IWL_MASK(0, hw_params(priv).max_txq_num));
835 /* Activate all Tx DMA/FIFO channels */
836 iwl_trans_txq_set_sched(priv, IWL_MASK(0, 7));
838 /* map queues to FIFOs */
839 if (priv->valid_contexts != BIT(IWL_RXON_CTX_BSS))
840 queue_to_fifo = iwlagn_ipan_queue_to_tx_fifo;
842 queue_to_fifo = iwlagn_default_queue_to_tx_fifo;
844 iwl_trans_set_wr_ptrs(priv, priv->cmd_queue, 0);
846 /* make sure all queue are not stopped */
847 memset(&priv->queue_stopped[0], 0, sizeof(priv->queue_stopped));
848 for (i = 0; i < 4; i++)
849 atomic_set(&priv->queue_stop_count[i], 0);
850 for_each_context(priv, ctx)
851 ctx->last_tx_rejected = false;
853 /* reset to 0 to enable all the queue first */
854 priv->txq_ctx_active_msk = 0;
856 BUILD_BUG_ON(ARRAY_SIZE(iwlagn_default_queue_to_tx_fifo) !=
857 IWLAGN_FIRST_AMPDU_QUEUE);
858 BUILD_BUG_ON(ARRAY_SIZE(iwlagn_ipan_queue_to_tx_fifo) !=
859 IWLAGN_FIRST_AMPDU_QUEUE);
861 for (i = 0; i < IWLAGN_FIRST_AMPDU_QUEUE; i++) {
862 int fifo = queue_to_fifo[i].fifo;
863 int ac = queue_to_fifo[i].ac;
865 iwl_txq_ctx_activate(priv, i);
867 if (fifo == IWL_TX_FIFO_UNUSED)
870 if (ac != IWL_AC_UNSET)
871 iwl_set_swq_id(&priv->txq[i], ac, i);
872 iwl_trans_tx_queue_set_status(priv, &priv->txq[i], fifo, 0);
875 spin_unlock_irqrestore(&priv->lock, flags);
877 /* Enable L1-Active */
878 iwl_clear_bits_prph(priv, APMG_PCIDEV_STT_REG,
879 APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
883 * iwlagn_txq_ctx_stop - Stop all Tx DMA channels
885 static int iwl_trans_tx_stop(struct iwl_priv *priv)
890 /* Turn off all Tx DMA fifos */
891 spin_lock_irqsave(&priv->lock, flags);
893 iwl_trans_txq_set_sched(priv, 0);
895 /* Stop each Tx DMA channel, and wait for it to be idle */
896 for (ch = 0; ch < FH_TCSR_CHNL_NUM; ch++) {
897 iwl_write_direct32(priv, FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0);
898 if (iwl_poll_direct_bit(priv, FH_TSSR_TX_STATUS_REG,
899 FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch),
901 IWL_ERR(priv, "Failing on timeout while stopping"
902 " DMA channel %d [0x%08x]", ch,
903 iwl_read_direct32(priv, FH_TSSR_TX_STATUS_REG));
905 spin_unlock_irqrestore(&priv->lock, flags);
908 IWL_WARN(priv, "Stopping tx queues that aren't allocated...");
912 /* Unmap DMA from host system and free skb's */
913 for (txq_id = 0; txq_id < hw_params(priv).max_txq_num; txq_id++)
914 iwl_tx_queue_unmap(priv, txq_id);
919 static void iwl_trans_stop_device(struct iwl_priv *priv)
923 /* stop and reset the on-board processor */
924 iwl_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET);
926 /* tell the device to stop sending interrupts */
927 spin_lock_irqsave(&priv->lock, flags);
928 iwl_disable_interrupts(priv);
929 spin_unlock_irqrestore(&priv->lock, flags);
930 trans_sync_irq(&priv->trans);
932 /* device going down, Stop using ICT table */
933 iwl_disable_ict(priv);
936 * If a HW restart happens during firmware loading,
937 * then the firmware loading might call this function
938 * and later it might be called again due to the
939 * restart. So don't process again if the device is
942 if (test_bit(STATUS_DEVICE_ENABLED, &priv->status)) {
943 iwl_trans_tx_stop(priv);
944 iwl_trans_rx_stop(priv);
946 /* Power-down device's busmaster DMA clocks */
947 iwl_write_prph(priv, APMG_CLK_DIS_REG,
948 APMG_CLK_VAL_DMA_CLK_RQT);
952 /* Make sure (redundant) we've released our request to stay awake */
953 iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
955 /* Stop the device, and put it in low power state */
959 static struct iwl_tx_cmd *iwl_trans_get_tx_cmd(struct iwl_priv *priv,
962 struct iwl_tx_queue *txq = &priv->txq[txq_id];
963 struct iwl_queue *q = &txq->q;
964 struct iwl_device_cmd *dev_cmd;
966 if (unlikely(iwl_queue_space(q) < q->high_mark))
970 * Set up the Tx-command (not MAC!) header.
971 * Store the chosen Tx queue and TFD index within the sequence field;
972 * after Tx, uCode's Tx response will return this value so driver can
973 * locate the frame within the tx queue and do post-tx processing.
975 dev_cmd = txq->cmd[q->write_ptr];
976 memset(dev_cmd, 0, sizeof(*dev_cmd));
977 dev_cmd->hdr.cmd = REPLY_TX;
978 dev_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
979 INDEX_TO_SEQ(q->write_ptr)));
980 return &dev_cmd->cmd.tx;
983 static int iwl_trans_tx(struct iwl_priv *priv, struct sk_buff *skb,
984 struct iwl_tx_cmd *tx_cmd, int txq_id, __le16 fc, bool ampdu,
985 struct iwl_rxon_context *ctx)
987 struct iwl_tx_queue *txq = &priv->txq[txq_id];
988 struct iwl_queue *q = &txq->q;
989 struct iwl_device_cmd *dev_cmd = txq->cmd[q->write_ptr];
990 struct iwl_cmd_meta *out_meta;
992 dma_addr_t phys_addr = 0;
993 dma_addr_t txcmd_phys;
994 dma_addr_t scratch_phys;
995 u16 len, firstlen, secondlen;
996 u8 wait_write_ptr = 0;
997 u8 hdr_len = ieee80211_hdrlen(fc);
999 /* Set up driver data for this TFD */
1000 memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info));
1001 txq->txb[q->write_ptr].skb = skb;
1002 txq->txb[q->write_ptr].ctx = ctx;
1004 /* Set up first empty entry in queue's array of Tx/cmd buffers */
1005 out_meta = &txq->meta[q->write_ptr];
1008 * Use the first empty entry in this queue's command buffer array
1009 * to contain the Tx command and MAC header concatenated together
1010 * (payload data will be in another buffer).
1011 * Size of this varies, due to varying MAC header length.
1012 * If end is not dword aligned, we'll have 2 extra bytes at the end
1013 * of the MAC header (device reads on dword boundaries).
1014 * We'll tell device about this padding later.
1016 len = sizeof(struct iwl_tx_cmd) +
1017 sizeof(struct iwl_cmd_header) + hdr_len;
1018 firstlen = (len + 3) & ~3;
1020 /* Tell NIC about any 2-byte padding after MAC header */
1021 if (firstlen != len)
1022 tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
1024 /* Physical address of this Tx command's header (not MAC header!),
1025 * within command buffer array. */
1026 txcmd_phys = dma_map_single(priv->bus->dev,
1027 &dev_cmd->hdr, firstlen,
1029 if (unlikely(dma_mapping_error(priv->bus->dev, txcmd_phys)))
1031 dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
1032 dma_unmap_len_set(out_meta, len, firstlen);
1034 if (!ieee80211_has_morefrags(fc)) {
1035 txq->need_update = 1;
1038 txq->need_update = 0;
1041 /* Set up TFD's 2nd entry to point directly to remainder of skb,
1042 * if any (802.11 null frames have no payload). */
1043 secondlen = skb->len - hdr_len;
1044 if (secondlen > 0) {
1045 phys_addr = dma_map_single(priv->bus->dev, skb->data + hdr_len,
1046 secondlen, DMA_TO_DEVICE);
1047 if (unlikely(dma_mapping_error(priv->bus->dev, phys_addr))) {
1048 dma_unmap_single(priv->bus->dev,
1049 dma_unmap_addr(out_meta, mapping),
1050 dma_unmap_len(out_meta, len),
1056 /* Attach buffers to TFD */
1057 iwlagn_txq_attach_buf_to_tfd(priv, txq, txcmd_phys, firstlen, 1);
1059 iwlagn_txq_attach_buf_to_tfd(priv, txq, phys_addr,
1062 scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) +
1063 offsetof(struct iwl_tx_cmd, scratch);
1065 /* take back ownership of DMA buffer to enable update */
1066 dma_sync_single_for_cpu(priv->bus->dev, txcmd_phys, firstlen,
1068 tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
1069 tx_cmd->dram_msb_ptr = iwl_get_dma_hi_addr(scratch_phys);
1071 IWL_DEBUG_TX(priv, "sequence nr = 0X%x\n",
1072 le16_to_cpu(dev_cmd->hdr.sequence));
1073 IWL_DEBUG_TX(priv, "tx_flags = 0X%x\n", le32_to_cpu(tx_cmd->tx_flags));
1074 iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd, sizeof(*tx_cmd));
1075 iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd->hdr, hdr_len);
1077 /* Set up entry for this TFD in Tx byte-count array */
1079 iwl_trans_txq_update_byte_cnt_tbl(priv, txq,
1080 le16_to_cpu(tx_cmd->len));
1082 dma_sync_single_for_device(priv->bus->dev, txcmd_phys, firstlen,
1085 trace_iwlwifi_dev_tx(priv,
1086 &((struct iwl_tfd *)txq->tfds)[txq->q.write_ptr],
1087 sizeof(struct iwl_tfd),
1088 &dev_cmd->hdr, firstlen,
1089 skb->data + hdr_len, secondlen);
1091 /* Tell device the write index *just past* this latest filled TFD */
1092 q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
1093 iwl_txq_update_write_ptr(priv, txq);
1096 * At this point the frame is "transmitted" successfully
1097 * and we will get a TX status notification eventually,
1098 * regardless of the value of ret. "ret" only indicates
1099 * whether or not we should update the write pointer.
1101 if ((iwl_queue_space(q) < q->high_mark) && priv->mac80211_registered) {
1102 if (wait_write_ptr) {
1103 txq->need_update = 1;
1104 iwl_txq_update_write_ptr(priv, txq);
1106 iwl_stop_queue(priv, txq);
1112 static void iwl_trans_kick_nic(struct iwl_priv *priv)
1114 /* Remove all resets to allow NIC to operate */
1115 iwl_write32(priv, CSR_RESET, 0);
1118 static void iwl_trans_sync_irq(struct iwl_priv *priv)
1120 /* wait to make sure we flush pending tasklet*/
1121 synchronize_irq(priv->bus->irq);
1122 tasklet_kill(&priv->irq_tasklet);
1125 static void iwl_trans_free(struct iwl_priv *priv)
1127 free_irq(priv->bus->irq, priv);
1128 iwl_free_isr_ict(priv);
1131 static const struct iwl_trans_ops trans_ops = {
1132 .start_device = iwl_trans_start_device,
1133 .prepare_card_hw = iwl_trans_prepare_card_hw,
1134 .stop_device = iwl_trans_stop_device,
1136 .tx_start = iwl_trans_tx_start,
1138 .rx_free = iwl_trans_rx_free,
1139 .tx_free = iwl_trans_tx_free,
1141 .send_cmd = iwl_send_cmd,
1142 .send_cmd_pdu = iwl_send_cmd_pdu,
1144 .get_tx_cmd = iwl_trans_get_tx_cmd,
1147 .txq_agg_disable = iwl_trans_txq_agg_disable,
1148 .txq_agg_setup = iwl_trans_txq_agg_setup,
1150 .kick_nic = iwl_trans_kick_nic,
1152 .sync_irq = iwl_trans_sync_irq,
1153 .free = iwl_trans_free,
1156 int iwl_trans_register(struct iwl_trans *trans, struct iwl_priv *priv)
1160 priv->trans.ops = &trans_ops;
1161 priv->trans.priv = priv;
1163 tasklet_init(&priv->irq_tasklet, (void (*)(unsigned long))
1164 iwl_irq_tasklet, (unsigned long)priv);
1166 iwl_alloc_isr_ict(priv);
1168 err = request_irq(priv->bus->irq, iwl_isr_ict, IRQF_SHARED,
1171 IWL_ERR(priv, "Error allocating IRQ %d\n", priv->bus->irq);
1172 iwl_free_isr_ict(priv);
1176 INIT_WORK(&priv->rx_replenish, iwl_bg_rx_replenish);