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,
57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 *****************************************************************************/
63 #include <linux/interrupt.h>
66 #include "iwl-trans.h"
68 #include "iwl-helpers.h"
69 #include "iwl-trans-int-pcie.h"
70 /*TODO remove uneeded includes when the transport layer tx_free will be here */
73 #include "iwl-shared.h"
75 static int iwl_trans_rx_alloc(struct iwl_priv *priv)
77 struct iwl_rx_queue *rxq = &priv->rxq;
78 struct device *dev = priv->bus->dev;
80 memset(&priv->rxq, 0, sizeof(priv->rxq));
82 spin_lock_init(&rxq->lock);
83 INIT_LIST_HEAD(&rxq->rx_free);
84 INIT_LIST_HEAD(&rxq->rx_used);
86 if (WARN_ON(rxq->bd || rxq->rb_stts))
89 /* Allocate the circular buffer of Read Buffer Descriptors (RBDs) */
90 rxq->bd = dma_alloc_coherent(dev, sizeof(__le32) * RX_QUEUE_SIZE,
91 &rxq->bd_dma, GFP_KERNEL);
94 memset(rxq->bd, 0, sizeof(__le32) * RX_QUEUE_SIZE);
96 /*Allocate the driver's pointer to receive buffer status */
97 rxq->rb_stts = dma_alloc_coherent(dev, sizeof(*rxq->rb_stts),
98 &rxq->rb_stts_dma, GFP_KERNEL);
101 memset(rxq->rb_stts, 0, sizeof(*rxq->rb_stts));
106 dma_free_coherent(dev, sizeof(__le32) * RX_QUEUE_SIZE,
107 rxq->bd, rxq->bd_dma);
108 memset(&rxq->bd_dma, 0, sizeof(rxq->bd_dma));
114 static void iwl_trans_rxq_free_rx_bufs(struct iwl_priv *priv)
116 struct iwl_rx_queue *rxq = &priv->rxq;
119 /* Fill the rx_used queue with _all_ of the Rx buffers */
120 for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
121 /* In the reset function, these buffers may have been allocated
122 * to an SKB, so we need to unmap and free potential storage */
123 if (rxq->pool[i].page != NULL) {
124 dma_unmap_page(priv->bus->dev, rxq->pool[i].page_dma,
125 PAGE_SIZE << hw_params(priv).rx_page_order,
127 __iwl_free_pages(priv, rxq->pool[i].page);
128 rxq->pool[i].page = NULL;
130 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
134 static void iwl_trans_rx_hw_init(struct iwl_priv *priv,
135 struct iwl_rx_queue *rxq)
138 const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
139 u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
141 rb_timeout = RX_RB_TIMEOUT;
143 if (iwlagn_mod_params.amsdu_size_8K)
144 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
146 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
149 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
151 /* Reset driver's Rx queue write index */
152 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
154 /* Tell device where to find RBD circular buffer in DRAM */
155 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
156 (u32)(rxq->bd_dma >> 8));
158 /* Tell device where in DRAM to update its Rx status */
159 iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
160 rxq->rb_stts_dma >> 4);
163 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
164 * the credit mechanism in 5000 HW RX FIFO
165 * Direct rx interrupts to hosts
166 * Rx buffer size 4 or 8k
170 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
171 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
172 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
173 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
174 FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
176 (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
177 (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
179 /* Set interrupt coalescing timer to default (2048 usecs) */
180 iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF);
183 static int iwl_rx_init(struct iwl_priv *priv)
185 struct iwl_rx_queue *rxq = &priv->rxq;
190 err = iwl_trans_rx_alloc(priv);
195 spin_lock_irqsave(&rxq->lock, flags);
196 INIT_LIST_HEAD(&rxq->rx_free);
197 INIT_LIST_HEAD(&rxq->rx_used);
199 iwl_trans_rxq_free_rx_bufs(priv);
201 for (i = 0; i < RX_QUEUE_SIZE; i++)
202 rxq->queue[i] = NULL;
204 /* Set us so that we have processed and used all buffers, but have
205 * not restocked the Rx queue with fresh buffers */
206 rxq->read = rxq->write = 0;
207 rxq->write_actual = 0;
209 spin_unlock_irqrestore(&rxq->lock, flags);
211 iwlagn_rx_replenish(priv);
213 iwl_trans_rx_hw_init(priv, rxq);
215 spin_lock_irqsave(&priv->shrd->lock, flags);
216 rxq->need_update = 1;
217 iwl_rx_queue_update_write_ptr(priv, rxq);
218 spin_unlock_irqrestore(&priv->shrd->lock, flags);
223 static void iwl_trans_pcie_rx_free(struct iwl_priv *priv)
225 struct iwl_rx_queue *rxq = &priv->rxq;
228 /*if rxq->bd is NULL, it means that nothing has been allocated,
231 IWL_DEBUG_INFO(priv, "Free NULL rx context\n");
235 spin_lock_irqsave(&rxq->lock, flags);
236 iwl_trans_rxq_free_rx_bufs(priv);
237 spin_unlock_irqrestore(&rxq->lock, flags);
239 dma_free_coherent(priv->bus->dev, sizeof(__le32) * RX_QUEUE_SIZE,
240 rxq->bd, rxq->bd_dma);
241 memset(&rxq->bd_dma, 0, sizeof(rxq->bd_dma));
245 dma_free_coherent(priv->bus->dev,
246 sizeof(struct iwl_rb_status),
247 rxq->rb_stts, rxq->rb_stts_dma);
249 IWL_DEBUG_INFO(priv, "Free rxq->rb_stts which is NULL\n");
250 memset(&rxq->rb_stts_dma, 0, sizeof(rxq->rb_stts_dma));
254 static int iwl_trans_rx_stop(struct iwl_priv *priv)
258 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
259 return iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
260 FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
263 static inline int iwlagn_alloc_dma_ptr(struct iwl_priv *priv,
264 struct iwl_dma_ptr *ptr, size_t size)
266 if (WARN_ON(ptr->addr))
269 ptr->addr = dma_alloc_coherent(priv->bus->dev, size,
270 &ptr->dma, GFP_KERNEL);
277 static inline void iwlagn_free_dma_ptr(struct iwl_priv *priv,
278 struct iwl_dma_ptr *ptr)
280 if (unlikely(!ptr->addr))
283 dma_free_coherent(priv->bus->dev, ptr->size, ptr->addr, ptr->dma);
284 memset(ptr, 0, sizeof(*ptr));
287 static int iwl_trans_txq_alloc(struct iwl_priv *priv, struct iwl_tx_queue *txq,
288 int slots_num, u32 txq_id)
290 size_t tfd_sz = hw_params(priv).tfd_size * TFD_QUEUE_SIZE_MAX;
293 if (WARN_ON(txq->meta || txq->cmd || txq->txb || txq->tfds))
296 txq->q.n_window = slots_num;
298 txq->meta = kzalloc(sizeof(txq->meta[0]) * slots_num,
300 txq->cmd = kzalloc(sizeof(txq->cmd[0]) * slots_num,
303 if (!txq->meta || !txq->cmd)
306 for (i = 0; i < slots_num; i++) {
307 txq->cmd[i] = kmalloc(sizeof(struct iwl_device_cmd),
313 /* Alloc driver data array and TFD circular buffer */
314 /* Driver private data, only for Tx (not command) queues,
315 * not shared with device. */
316 if (txq_id != priv->shrd->cmd_queue) {
317 txq->txb = kzalloc(sizeof(txq->txb[0]) *
318 TFD_QUEUE_SIZE_MAX, GFP_KERNEL);
320 IWL_ERR(priv, "kmalloc for auxiliary BD "
321 "structures failed\n");
328 /* Circular buffer of transmit frame descriptors (TFDs),
329 * shared with device */
330 txq->tfds = dma_alloc_coherent(priv->bus->dev, tfd_sz, &txq->q.dma_addr,
333 IWL_ERR(priv, "dma_alloc_coherent(%zd) failed\n", tfd_sz);
342 /* since txq->cmd has been zeroed,
343 * all non allocated cmd[i] will be NULL */
345 for (i = 0; i < slots_num; i++)
356 static int iwl_trans_txq_init(struct iwl_priv *priv, struct iwl_tx_queue *txq,
357 int slots_num, u32 txq_id)
361 txq->need_update = 0;
362 memset(txq->meta, 0, sizeof(txq->meta[0]) * slots_num);
365 * For the default queues 0-3, set up the swq_id
366 * already -- all others need to get one later
367 * (if they need one at all).
370 iwl_set_swq_id(txq, txq_id, txq_id);
372 /* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
373 * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
374 BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
376 /* Initialize queue's high/low-water marks, and head/tail indexes */
377 ret = iwl_queue_init(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num,
383 * Tell nic where to find circular buffer of Tx Frame Descriptors for
384 * given Tx queue, and enable the DMA channel used for that queue.
385 * Circular buffer (TFD queue in DRAM) physical base address */
386 iwl_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id),
387 txq->q.dma_addr >> 8);
393 * iwl_tx_queue_unmap - Unmap any remaining DMA mappings and free skb's
395 static void iwl_tx_queue_unmap(struct iwl_priv *priv, int txq_id)
397 struct iwl_tx_queue *txq = &priv->txq[txq_id];
398 struct iwl_queue *q = &txq->q;
403 while (q->write_ptr != q->read_ptr) {
404 /* The read_ptr needs to bound by q->n_window */
405 iwlagn_txq_free_tfd(priv, txq, get_cmd_index(q, q->read_ptr));
406 q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd);
411 * iwl_tx_queue_free - Deallocate DMA queue.
412 * @txq: Transmit queue to deallocate.
414 * Empty queue by removing and destroying all BD's.
416 * 0-fill, but do not free "txq" descriptor structure.
418 static void iwl_tx_queue_free(struct iwl_priv *priv, int txq_id)
420 struct iwl_tx_queue *txq = &priv->txq[txq_id];
421 struct device *dev = priv->bus->dev;
426 iwl_tx_queue_unmap(priv, txq_id);
428 /* De-alloc array of command/tx buffers */
429 for (i = 0; i < txq->q.n_window; i++)
432 /* De-alloc circular buffer of TFDs */
434 dma_free_coherent(dev, hw_params(priv).tfd_size *
435 txq->q.n_bd, txq->tfds, txq->q.dma_addr);
436 memset(&txq->q.dma_addr, 0, sizeof(txq->q.dma_addr));
439 /* De-alloc array of per-TFD driver data */
443 /* deallocate arrays */
449 /* 0-fill queue descriptor structure */
450 memset(txq, 0, sizeof(*txq));
454 * iwl_trans_tx_free - Free TXQ Context
456 * Destroy all TX DMA queues and structures
458 static void iwl_trans_pcie_tx_free(struct iwl_priv *priv)
465 txq_id < hw_params(priv).max_txq_num; txq_id++)
466 iwl_tx_queue_free(priv, txq_id);
472 iwlagn_free_dma_ptr(priv, &priv->kw);
474 iwlagn_free_dma_ptr(priv, &priv->scd_bc_tbls);
478 * iwl_trans_tx_alloc - allocate TX context
479 * Allocate all Tx DMA structures and initialize them
484 static int iwl_trans_tx_alloc(struct iwl_priv *priv)
487 int txq_id, slots_num;
489 /*It is not allowed to alloc twice, so warn when this happens.
490 * We cannot rely on the previous allocation, so free and fail */
491 if (WARN_ON(priv->txq)) {
496 ret = iwlagn_alloc_dma_ptr(priv, &priv->scd_bc_tbls,
497 hw_params(priv).scd_bc_tbls_size);
499 IWL_ERR(priv, "Scheduler BC Table allocation failed\n");
503 /* Alloc keep-warm buffer */
504 ret = iwlagn_alloc_dma_ptr(priv, &priv->kw, IWL_KW_SIZE);
506 IWL_ERR(priv, "Keep Warm allocation failed\n");
510 priv->txq = kzalloc(sizeof(struct iwl_tx_queue) *
511 priv->cfg->base_params->num_of_queues, GFP_KERNEL);
513 IWL_ERR(priv, "Not enough memory for txq\n");
518 /* Alloc and init all Tx queues, including the command queue (#4/#9) */
519 for (txq_id = 0; txq_id < hw_params(priv).max_txq_num; txq_id++) {
520 slots_num = (txq_id == priv->shrd->cmd_queue) ?
521 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
522 ret = iwl_trans_txq_alloc(priv, &priv->txq[txq_id], slots_num,
525 IWL_ERR(priv, "Tx %d queue alloc failed\n", txq_id);
533 iwl_trans_tx_free(trans(priv));
537 static int iwl_tx_init(struct iwl_priv *priv)
540 int txq_id, slots_num;
545 ret = iwl_trans_tx_alloc(priv);
551 spin_lock_irqsave(&priv->shrd->lock, flags);
553 /* Turn off all Tx DMA fifos */
554 iwl_write_prph(priv, SCD_TXFACT, 0);
556 /* Tell NIC where to find the "keep warm" buffer */
557 iwl_write_direct32(priv, FH_KW_MEM_ADDR_REG, priv->kw.dma >> 4);
559 spin_unlock_irqrestore(&priv->shrd->lock, flags);
561 /* Alloc and init all Tx queues, including the command queue (#4/#9) */
562 for (txq_id = 0; txq_id < hw_params(priv).max_txq_num; txq_id++) {
563 slots_num = (txq_id == priv->shrd->cmd_queue) ?
564 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
565 ret = iwl_trans_txq_init(priv, &priv->txq[txq_id], slots_num,
568 IWL_ERR(priv, "Tx %d queue init failed\n", txq_id);
575 /*Upon error, free only if we allocated something */
577 iwl_trans_tx_free(trans(priv));
581 static void iwl_set_pwr_vmain(struct iwl_priv *priv)
584 * (for documentation purposes)
585 * to set power to V_AUX, do:
587 if (pci_pme_capable(priv->pci_dev, PCI_D3cold))
588 iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
589 APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
590 ~APMG_PS_CTRL_MSK_PWR_SRC);
593 iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
594 APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
595 ~APMG_PS_CTRL_MSK_PWR_SRC);
598 static int iwl_nic_init(struct iwl_priv *priv)
603 spin_lock_irqsave(&priv->shrd->lock, flags);
606 /* Set interrupt coalescing calibration timer to default (512 usecs) */
607 iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_CALIB_TIMEOUT_DEF);
609 spin_unlock_irqrestore(&priv->shrd->lock, flags);
611 iwl_set_pwr_vmain(priv);
613 priv->cfg->lib->nic_config(priv);
615 /* Allocate the RX queue, or reset if it is already allocated */
618 /* Allocate or reset and init all Tx and Command queues */
619 if (iwl_tx_init(priv))
622 if (priv->cfg->base_params->shadow_reg_enable) {
623 /* enable shadow regs in HW */
624 iwl_set_bit(priv, CSR_MAC_SHADOW_REG_CTRL,
628 set_bit(STATUS_INIT, &priv->shrd->status);
633 #define HW_READY_TIMEOUT (50)
635 /* Note: returns poll_bit return value, which is >= 0 if success */
636 static int iwl_set_hw_ready(struct iwl_priv *priv)
640 iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
641 CSR_HW_IF_CONFIG_REG_BIT_NIC_READY);
643 /* See if we got it */
644 ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
645 CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
646 CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
649 IWL_DEBUG_INFO(priv, "hardware%s ready\n", ret < 0 ? " not" : "");
653 /* Note: returns standard 0/-ERROR code */
654 static int iwl_trans_pcie_prepare_card_hw(struct iwl_priv *priv)
658 IWL_DEBUG_INFO(priv, "iwl_trans_prepare_card_hw enter\n");
660 ret = iwl_set_hw_ready(priv);
664 /* If HW is not ready, prepare the conditions to check again */
665 iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
666 CSR_HW_IF_CONFIG_REG_PREPARE);
668 ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
669 ~CSR_HW_IF_CONFIG_REG_BIT_NIC_PREPARE_DONE,
670 CSR_HW_IF_CONFIG_REG_BIT_NIC_PREPARE_DONE, 150000);
675 /* HW should be ready by now, check again. */
676 ret = iwl_set_hw_ready(priv);
682 static int iwl_trans_pcie_start_device(struct iwl_priv *priv)
686 priv->ucode_owner = IWL_OWNERSHIP_DRIVER;
688 if ((priv->cfg->sku & EEPROM_SKU_CAP_AMT_ENABLE) &&
689 iwl_trans_pcie_prepare_card_hw(priv)) {
690 IWL_WARN(priv, "Exit HW not ready\n");
694 /* If platform's RF_KILL switch is NOT set to KILL */
695 if (iwl_read32(priv, CSR_GP_CNTRL) &
696 CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW)
697 clear_bit(STATUS_RF_KILL_HW, &priv->shrd->status);
699 set_bit(STATUS_RF_KILL_HW, &priv->shrd->status);
701 if (iwl_is_rfkill(priv)) {
702 wiphy_rfkill_set_hw_state(priv->hw->wiphy, true);
703 iwl_enable_interrupts(priv);
707 iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
709 ret = iwl_nic_init(priv);
711 IWL_ERR(priv, "Unable to init nic\n");
715 /* make sure rfkill handshake bits are cleared */
716 iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
717 iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
718 CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
720 /* clear (again), then enable host interrupts */
721 iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
722 iwl_enable_interrupts(priv);
724 /* really make sure rfkill handshake bits are cleared */
725 iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
726 iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
732 * Activate/Deactivate Tx DMA/FIFO channels according tx fifos mask
733 * must be called under priv->shrd->lock and mac access
735 static void iwl_trans_txq_set_sched(struct iwl_priv *priv, u32 mask)
737 iwl_write_prph(priv, SCD_TXFACT, mask);
740 #define IWL_AC_UNSET -1
742 struct queue_to_fifo_ac {
746 static const struct queue_to_fifo_ac iwlagn_default_queue_to_tx_fifo[] = {
747 { IWL_TX_FIFO_VO, IEEE80211_AC_VO, },
748 { IWL_TX_FIFO_VI, IEEE80211_AC_VI, },
749 { IWL_TX_FIFO_BE, IEEE80211_AC_BE, },
750 { IWL_TX_FIFO_BK, IEEE80211_AC_BK, },
751 { IWLAGN_CMD_FIFO_NUM, 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, },
756 { IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
757 { IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
760 static const struct queue_to_fifo_ac iwlagn_ipan_queue_to_tx_fifo[] = {
761 { IWL_TX_FIFO_VO, IEEE80211_AC_VO, },
762 { IWL_TX_FIFO_VI, IEEE80211_AC_VI, },
763 { IWL_TX_FIFO_BE, IEEE80211_AC_BE, },
764 { IWL_TX_FIFO_BK, IEEE80211_AC_BK, },
765 { IWL_TX_FIFO_BK_IPAN, IEEE80211_AC_BK, },
766 { IWL_TX_FIFO_BE_IPAN, IEEE80211_AC_BE, },
767 { IWL_TX_FIFO_VI_IPAN, IEEE80211_AC_VI, },
768 { IWL_TX_FIFO_VO_IPAN, IEEE80211_AC_VO, },
769 { IWL_TX_FIFO_BE_IPAN, 2, },
770 { IWLAGN_CMD_FIFO_NUM, IWL_AC_UNSET, },
771 { IWL_TX_FIFO_AUX, IWL_AC_UNSET, },
773 static void iwl_trans_pcie_tx_start(struct iwl_priv *priv)
775 const struct queue_to_fifo_ac *queue_to_fifo;
776 struct iwl_rxon_context *ctx;
782 spin_lock_irqsave(&priv->shrd->lock, flags);
784 priv->scd_base_addr = iwl_read_prph(priv, SCD_SRAM_BASE_ADDR);
785 a = priv->scd_base_addr + SCD_CONTEXT_MEM_LOWER_BOUND;
786 /* reset conext data memory */
787 for (; a < priv->scd_base_addr + SCD_CONTEXT_MEM_UPPER_BOUND;
789 iwl_write_targ_mem(priv, a, 0);
790 /* reset tx status memory */
791 for (; a < priv->scd_base_addr + SCD_TX_STTS_MEM_UPPER_BOUND;
793 iwl_write_targ_mem(priv, a, 0);
794 for (; a < priv->scd_base_addr +
795 SCD_TRANS_TBL_OFFSET_QUEUE(hw_params(priv).max_txq_num);
797 iwl_write_targ_mem(priv, a, 0);
799 iwl_write_prph(priv, SCD_DRAM_BASE_ADDR,
800 priv->scd_bc_tbls.dma >> 10);
802 /* Enable DMA channel */
803 for (chan = 0; chan < FH_TCSR_CHNL_NUM ; chan++)
804 iwl_write_direct32(priv, FH_TCSR_CHNL_TX_CONFIG_REG(chan),
805 FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
806 FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE);
808 /* Update FH chicken bits */
809 reg_val = iwl_read_direct32(priv, FH_TX_CHICKEN_BITS_REG);
810 iwl_write_direct32(priv, FH_TX_CHICKEN_BITS_REG,
811 reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN);
813 iwl_write_prph(priv, SCD_QUEUECHAIN_SEL,
814 SCD_QUEUECHAIN_SEL_ALL(priv));
815 iwl_write_prph(priv, SCD_AGGR_SEL, 0);
817 /* initiate the queues */
818 for (i = 0; i < hw_params(priv).max_txq_num; i++) {
819 iwl_write_prph(priv, SCD_QUEUE_RDPTR(i), 0);
820 iwl_write_direct32(priv, HBUS_TARG_WRPTR, 0 | (i << 8));
821 iwl_write_targ_mem(priv, priv->scd_base_addr +
822 SCD_CONTEXT_QUEUE_OFFSET(i), 0);
823 iwl_write_targ_mem(priv, priv->scd_base_addr +
824 SCD_CONTEXT_QUEUE_OFFSET(i) +
827 SCD_QUEUE_CTX_REG2_WIN_SIZE_POS) &
828 SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK) |
830 SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
831 SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK));
834 iwl_write_prph(priv, SCD_INTERRUPT_MASK,
835 IWL_MASK(0, hw_params(priv).max_txq_num));
837 /* Activate all Tx DMA/FIFO channels */
838 iwl_trans_txq_set_sched(priv, IWL_MASK(0, 7));
840 /* map queues to FIFOs */
841 if (priv->valid_contexts != BIT(IWL_RXON_CTX_BSS))
842 queue_to_fifo = iwlagn_ipan_queue_to_tx_fifo;
844 queue_to_fifo = iwlagn_default_queue_to_tx_fifo;
846 iwl_trans_set_wr_ptrs(priv, priv->shrd->cmd_queue, 0);
848 /* make sure all queue are not stopped */
849 memset(&priv->queue_stopped[0], 0, sizeof(priv->queue_stopped));
850 for (i = 0; i < 4; i++)
851 atomic_set(&priv->queue_stop_count[i], 0);
852 for_each_context(priv, ctx)
853 ctx->last_tx_rejected = false;
855 /* reset to 0 to enable all the queue first */
856 priv->txq_ctx_active_msk = 0;
858 BUILD_BUG_ON(ARRAY_SIZE(iwlagn_default_queue_to_tx_fifo) !=
859 IWLAGN_FIRST_AMPDU_QUEUE);
860 BUILD_BUG_ON(ARRAY_SIZE(iwlagn_ipan_queue_to_tx_fifo) !=
861 IWLAGN_FIRST_AMPDU_QUEUE);
863 for (i = 0; i < IWLAGN_FIRST_AMPDU_QUEUE; i++) {
864 int fifo = queue_to_fifo[i].fifo;
865 int ac = queue_to_fifo[i].ac;
867 iwl_txq_ctx_activate(priv, i);
869 if (fifo == IWL_TX_FIFO_UNUSED)
872 if (ac != IWL_AC_UNSET)
873 iwl_set_swq_id(&priv->txq[i], ac, i);
874 iwl_trans_tx_queue_set_status(priv, &priv->txq[i], fifo, 0);
877 spin_unlock_irqrestore(&priv->shrd->lock, flags);
879 /* Enable L1-Active */
880 iwl_clear_bits_prph(priv, APMG_PCIDEV_STT_REG,
881 APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
885 * iwlagn_txq_ctx_stop - Stop all Tx DMA channels
887 static int iwl_trans_tx_stop(struct iwl_priv *priv)
892 /* Turn off all Tx DMA fifos */
893 spin_lock_irqsave(&priv->shrd->lock, flags);
895 iwl_trans_txq_set_sched(priv, 0);
897 /* Stop each Tx DMA channel, and wait for it to be idle */
898 for (ch = 0; ch < FH_TCSR_CHNL_NUM; ch++) {
899 iwl_write_direct32(priv, FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0);
900 if (iwl_poll_direct_bit(priv, FH_TSSR_TX_STATUS_REG,
901 FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch),
903 IWL_ERR(priv, "Failing on timeout while stopping"
904 " DMA channel %d [0x%08x]", ch,
905 iwl_read_direct32(priv, FH_TSSR_TX_STATUS_REG));
907 spin_unlock_irqrestore(&priv->shrd->lock, flags);
910 IWL_WARN(priv, "Stopping tx queues that aren't allocated...");
914 /* Unmap DMA from host system and free skb's */
915 for (txq_id = 0; txq_id < hw_params(priv).max_txq_num; txq_id++)
916 iwl_tx_queue_unmap(priv, txq_id);
921 static void iwl_trans_pcie_stop_device(struct iwl_priv *priv)
925 /* stop and reset the on-board processor */
926 iwl_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET);
928 /* tell the device to stop sending interrupts */
929 spin_lock_irqsave(&priv->shrd->lock, flags);
930 iwl_disable_interrupts(priv);
931 spin_unlock_irqrestore(&priv->shrd->lock, flags);
932 iwl_trans_sync_irq(trans(priv));
934 /* device going down, Stop using ICT table */
935 iwl_disable_ict(priv);
938 * If a HW restart happens during firmware loading,
939 * then the firmware loading might call this function
940 * and later it might be called again due to the
941 * restart. So don't process again if the device is
944 if (test_bit(STATUS_DEVICE_ENABLED, &priv->shrd->status)) {
945 iwl_trans_tx_stop(priv);
946 iwl_trans_rx_stop(priv);
948 /* Power-down device's busmaster DMA clocks */
949 iwl_write_prph(priv, APMG_CLK_DIS_REG,
950 APMG_CLK_VAL_DMA_CLK_RQT);
954 /* Make sure (redundant) we've released our request to stay awake */
955 iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
957 /* Stop the device, and put it in low power state */
961 static struct iwl_tx_cmd *iwl_trans_pcie_get_tx_cmd(struct iwl_priv *priv,
964 struct iwl_tx_queue *txq = &priv->txq[txq_id];
965 struct iwl_queue *q = &txq->q;
966 struct iwl_device_cmd *dev_cmd;
968 if (unlikely(iwl_queue_space(q) < q->high_mark))
972 * Set up the Tx-command (not MAC!) header.
973 * Store the chosen Tx queue and TFD index within the sequence field;
974 * after Tx, uCode's Tx response will return this value so driver can
975 * locate the frame within the tx queue and do post-tx processing.
977 dev_cmd = txq->cmd[q->write_ptr];
978 memset(dev_cmd, 0, sizeof(*dev_cmd));
979 dev_cmd->hdr.cmd = REPLY_TX;
980 dev_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
981 INDEX_TO_SEQ(q->write_ptr)));
982 return &dev_cmd->cmd.tx;
985 static int iwl_trans_pcie_tx(struct iwl_priv *priv, struct sk_buff *skb,
986 struct iwl_tx_cmd *tx_cmd, int txq_id, __le16 fc, bool ampdu,
987 struct iwl_rxon_context *ctx)
989 struct iwl_tx_queue *txq = &priv->txq[txq_id];
990 struct iwl_queue *q = &txq->q;
991 struct iwl_device_cmd *dev_cmd = txq->cmd[q->write_ptr];
992 struct iwl_cmd_meta *out_meta;
994 dma_addr_t phys_addr = 0;
995 dma_addr_t txcmd_phys;
996 dma_addr_t scratch_phys;
997 u16 len, firstlen, secondlen;
998 u8 wait_write_ptr = 0;
999 u8 hdr_len = ieee80211_hdrlen(fc);
1001 /* Set up driver data for this TFD */
1002 memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info));
1003 txq->txb[q->write_ptr].skb = skb;
1004 txq->txb[q->write_ptr].ctx = ctx;
1006 /* Set up first empty entry in queue's array of Tx/cmd buffers */
1007 out_meta = &txq->meta[q->write_ptr];
1010 * Use the first empty entry in this queue's command buffer array
1011 * to contain the Tx command and MAC header concatenated together
1012 * (payload data will be in another buffer).
1013 * Size of this varies, due to varying MAC header length.
1014 * If end is not dword aligned, we'll have 2 extra bytes at the end
1015 * of the MAC header (device reads on dword boundaries).
1016 * We'll tell device about this padding later.
1018 len = sizeof(struct iwl_tx_cmd) +
1019 sizeof(struct iwl_cmd_header) + hdr_len;
1020 firstlen = (len + 3) & ~3;
1022 /* Tell NIC about any 2-byte padding after MAC header */
1023 if (firstlen != len)
1024 tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
1026 /* Physical address of this Tx command's header (not MAC header!),
1027 * within command buffer array. */
1028 txcmd_phys = dma_map_single(priv->bus->dev,
1029 &dev_cmd->hdr, firstlen,
1031 if (unlikely(dma_mapping_error(priv->bus->dev, txcmd_phys)))
1033 dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
1034 dma_unmap_len_set(out_meta, len, firstlen);
1036 if (!ieee80211_has_morefrags(fc)) {
1037 txq->need_update = 1;
1040 txq->need_update = 0;
1043 /* Set up TFD's 2nd entry to point directly to remainder of skb,
1044 * if any (802.11 null frames have no payload). */
1045 secondlen = skb->len - hdr_len;
1046 if (secondlen > 0) {
1047 phys_addr = dma_map_single(priv->bus->dev, skb->data + hdr_len,
1048 secondlen, DMA_TO_DEVICE);
1049 if (unlikely(dma_mapping_error(priv->bus->dev, phys_addr))) {
1050 dma_unmap_single(priv->bus->dev,
1051 dma_unmap_addr(out_meta, mapping),
1052 dma_unmap_len(out_meta, len),
1058 /* Attach buffers to TFD */
1059 iwlagn_txq_attach_buf_to_tfd(priv, txq, txcmd_phys, firstlen, 1);
1061 iwlagn_txq_attach_buf_to_tfd(priv, txq, phys_addr,
1064 scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) +
1065 offsetof(struct iwl_tx_cmd, scratch);
1067 /* take back ownership of DMA buffer to enable update */
1068 dma_sync_single_for_cpu(priv->bus->dev, txcmd_phys, firstlen,
1070 tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
1071 tx_cmd->dram_msb_ptr = iwl_get_dma_hi_addr(scratch_phys);
1073 IWL_DEBUG_TX(priv, "sequence nr = 0X%x\n",
1074 le16_to_cpu(dev_cmd->hdr.sequence));
1075 IWL_DEBUG_TX(priv, "tx_flags = 0X%x\n", le32_to_cpu(tx_cmd->tx_flags));
1076 iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd, sizeof(*tx_cmd));
1077 iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd->hdr, hdr_len);
1079 /* Set up entry for this TFD in Tx byte-count array */
1081 iwl_trans_txq_update_byte_cnt_tbl(priv, txq,
1082 le16_to_cpu(tx_cmd->len));
1084 dma_sync_single_for_device(priv->bus->dev, txcmd_phys, firstlen,
1087 trace_iwlwifi_dev_tx(priv,
1088 &((struct iwl_tfd *)txq->tfds)[txq->q.write_ptr],
1089 sizeof(struct iwl_tfd),
1090 &dev_cmd->hdr, firstlen,
1091 skb->data + hdr_len, secondlen);
1093 /* Tell device the write index *just past* this latest filled TFD */
1094 q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
1095 iwl_txq_update_write_ptr(priv, txq);
1098 * At this point the frame is "transmitted" successfully
1099 * and we will get a TX status notification eventually,
1100 * regardless of the value of ret. "ret" only indicates
1101 * whether or not we should update the write pointer.
1103 if ((iwl_queue_space(q) < q->high_mark) && priv->mac80211_registered) {
1104 if (wait_write_ptr) {
1105 txq->need_update = 1;
1106 iwl_txq_update_write_ptr(priv, txq);
1108 iwl_stop_queue(priv, txq);
1114 static void iwl_trans_pcie_kick_nic(struct iwl_priv *priv)
1116 /* Remove all resets to allow NIC to operate */
1117 iwl_write32(priv, CSR_RESET, 0);
1120 static int iwl_trans_pcie_request_irq(struct iwl_trans *trans)
1122 struct iwl_priv *priv = priv(trans);
1125 tasklet_init(&priv->irq_tasklet, (void (*)(unsigned long))
1126 iwl_irq_tasklet, (unsigned long)priv);
1128 iwl_alloc_isr_ict(priv);
1130 err = request_irq(bus(trans)->irq, iwl_isr_ict, IRQF_SHARED,
1133 IWL_ERR(priv, "Error allocating IRQ %d\n", priv->bus->irq);
1134 iwl_free_isr_ict(priv);
1138 INIT_WORK(&priv->rx_replenish, iwl_bg_rx_replenish);
1142 static void iwl_trans_pcie_sync_irq(struct iwl_priv *priv)
1144 /* wait to make sure we flush pending tasklet*/
1145 synchronize_irq(priv->bus->irq);
1146 tasklet_kill(&priv->irq_tasklet);
1149 static void iwl_trans_pcie_free(struct iwl_priv *priv)
1151 free_irq(priv->bus->irq, priv);
1152 iwl_free_isr_ict(priv);
1157 const struct iwl_trans_ops trans_ops_pcie;
1159 static struct iwl_trans *iwl_trans_pcie_alloc(struct iwl_shared *shrd)
1161 struct iwl_trans *iwl_trans = kzalloc(sizeof(struct iwl_trans) +
1162 sizeof(struct iwl_trans_pcie),
1165 iwl_trans->ops = &trans_ops_pcie;
1166 iwl_trans->shrd = shrd;
1172 const struct iwl_trans_ops trans_ops_pcie = {
1173 .alloc = iwl_trans_pcie_alloc,
1174 .request_irq = iwl_trans_pcie_request_irq,
1175 .start_device = iwl_trans_pcie_start_device,
1176 .prepare_card_hw = iwl_trans_pcie_prepare_card_hw,
1177 .stop_device = iwl_trans_pcie_stop_device,
1179 .tx_start = iwl_trans_pcie_tx_start,
1181 .rx_free = iwl_trans_pcie_rx_free,
1182 .tx_free = iwl_trans_pcie_tx_free,
1184 .send_cmd = iwl_trans_pcie_send_cmd,
1185 .send_cmd_pdu = iwl_trans_pcie_send_cmd_pdu,
1187 .get_tx_cmd = iwl_trans_pcie_get_tx_cmd,
1188 .tx = iwl_trans_pcie_tx,
1190 .txq_agg_disable = iwl_trans_pcie_txq_agg_disable,
1191 .txq_agg_setup = iwl_trans_pcie_txq_agg_setup,
1193 .kick_nic = iwl_trans_pcie_kick_nic,
1195 .sync_irq = iwl_trans_pcie_sync_irq,
1196 .free = iwl_trans_pcie_free,