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linux/drivers/net/wireless/iwlwifi/iwl-trans.c

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/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2007 - 2011 Intel Corporation. All rights reserved.
*
* 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.GPL.
*
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
* BSD LICENSE
*
* Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
#include "iwl-dev.h"
#include "iwl-trans.h"
#include "iwl-core.h"
#include "iwl-helpers.h"
#include "iwl-trans-int-pcie.h"
/*TODO remove uneeded includes when the transport layer tx_free will be here */
#include "iwl-agn.h"
#include "iwl-core.h"
static int iwl_trans_rx_alloc(struct iwl_priv *priv)
{
struct iwl_rx_queue *rxq = &priv->rxq;
struct device *dev = priv->bus->dev;
memset(&priv->rxq, 0, sizeof(priv->rxq));
spin_lock_init(&rxq->lock);
INIT_LIST_HEAD(&rxq->rx_free);
INIT_LIST_HEAD(&rxq->rx_used);
if (WARN_ON(rxq->bd || rxq->rb_stts))
return -EINVAL;
/* Allocate the circular buffer of Read Buffer Descriptors (RBDs) */
rxq->bd = dma_alloc_coherent(dev, sizeof(__le32) * RX_QUEUE_SIZE,
&rxq->bd_dma, GFP_KERNEL);
if (!rxq->bd)
goto err_bd;
memset(rxq->bd, 0, sizeof(__le32) * RX_QUEUE_SIZE);
/*Allocate the driver's pointer to receive buffer status */
rxq->rb_stts = dma_alloc_coherent(dev, sizeof(*rxq->rb_stts),
&rxq->rb_stts_dma, GFP_KERNEL);
if (!rxq->rb_stts)
goto err_rb_stts;
memset(rxq->rb_stts, 0, sizeof(*rxq->rb_stts));
return 0;
err_rb_stts:
dma_free_coherent(dev, sizeof(__le32) * RX_QUEUE_SIZE,
rxq->bd, rxq->bd_dma);
memset(&rxq->bd_dma, 0, sizeof(rxq->bd_dma));
rxq->bd = NULL;
err_bd:
return -ENOMEM;
}
static void iwl_trans_rxq_free_rx_bufs(struct iwl_priv *priv)
{
struct iwl_rx_queue *rxq = &priv->rxq;
int i;
/* Fill the rx_used queue with _all_ of the Rx buffers */
for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
/* In the reset function, these buffers may have been allocated
* to an SKB, so we need to unmap and free potential storage */
if (rxq->pool[i].page != NULL) {
dma_unmap_page(priv->bus->dev, rxq->pool[i].page_dma,
PAGE_SIZE << priv->hw_params.rx_page_order,
DMA_FROM_DEVICE);
__iwl_free_pages(priv, rxq->pool[i].page);
rxq->pool[i].page = NULL;
}
list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
}
}
static void iwl_trans_rx_hw_init(struct iwl_priv *priv,
struct iwl_rx_queue *rxq)
{
u32 rb_size;
const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
rb_timeout = RX_RB_TIMEOUT;
if (iwlagn_mod_params.amsdu_size_8K)
rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
else
rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
/* Stop Rx DMA */
iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
/* Reset driver's Rx queue write index */
iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
/* Tell device where to find RBD circular buffer in DRAM */
iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
(u32)(rxq->bd_dma >> 8));
/* Tell device where in DRAM to update its Rx status */
iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
rxq->rb_stts_dma >> 4);
/* Enable Rx DMA
* FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
* the credit mechanism in 5000 HW RX FIFO
* Direct rx interrupts to hosts
* Rx buffer size 4 or 8k
* RB timeout 0x10
* 256 RBDs
*/
iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
rb_size|
(rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
(rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
/* Set interrupt coalescing timer to default (2048 usecs) */
iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF);
}
static int iwl_rx_init(struct iwl_priv *priv)
{
struct iwl_rx_queue *rxq = &priv->rxq;
int i, err;
unsigned long flags;
if (!rxq->bd) {
err = iwl_trans_rx_alloc(priv);
if (err)
return err;
}
spin_lock_irqsave(&rxq->lock, flags);
INIT_LIST_HEAD(&rxq->rx_free);
INIT_LIST_HEAD(&rxq->rx_used);
iwl_trans_rxq_free_rx_bufs(priv);
for (i = 0; i < RX_QUEUE_SIZE; i++)
rxq->queue[i] = NULL;
/* Set us so that we have processed and used all buffers, but have
* not restocked the Rx queue with fresh buffers */
rxq->read = rxq->write = 0;
rxq->write_actual = 0;
rxq->free_count = 0;
spin_unlock_irqrestore(&rxq->lock, flags);
iwlagn_rx_replenish(priv);
iwl_trans_rx_hw_init(priv, rxq);
spin_lock_irqsave(&priv->lock, flags);
rxq->need_update = 1;
iwl_rx_queue_update_write_ptr(priv, rxq);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static void iwl_trans_rx_free(struct iwl_priv *priv)
{
struct iwl_rx_queue *rxq = &priv->rxq;
unsigned long flags;
/*if rxq->bd is NULL, it means that nothing has been allocated,
* exit now */
if (!rxq->bd) {
IWL_DEBUG_INFO(priv, "Free NULL rx context\n");
return;
}
spin_lock_irqsave(&rxq->lock, flags);
iwl_trans_rxq_free_rx_bufs(priv);
spin_unlock_irqrestore(&rxq->lock, flags);
dma_free_coherent(priv->bus->dev, sizeof(__le32) * RX_QUEUE_SIZE,
rxq->bd, rxq->bd_dma);
memset(&rxq->bd_dma, 0, sizeof(rxq->bd_dma));
rxq->bd = NULL;
if (rxq->rb_stts)
dma_free_coherent(priv->bus->dev,
sizeof(struct iwl_rb_status),
rxq->rb_stts, rxq->rb_stts_dma);
else
IWL_DEBUG_INFO(priv, "Free rxq->rb_stts which is NULL\n");
memset(&rxq->rb_stts_dma, 0, sizeof(rxq->rb_stts_dma));
rxq->rb_stts = NULL;
}
static int iwl_trans_rx_stop(struct iwl_priv *priv)
{
/* stop Rx DMA */
iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
return iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
}
static inline int iwlagn_alloc_dma_ptr(struct iwl_priv *priv,
struct iwl_dma_ptr *ptr, size_t size)
{
if (WARN_ON(ptr->addr))
return -EINVAL;
ptr->addr = dma_alloc_coherent(priv->bus->dev, size,
&ptr->dma, GFP_KERNEL);
if (!ptr->addr)
return -ENOMEM;
ptr->size = size;
return 0;
}
static inline void iwlagn_free_dma_ptr(struct iwl_priv *priv,
struct iwl_dma_ptr *ptr)
{
if (unlikely(!ptr->addr))
return;
dma_free_coherent(priv->bus->dev, ptr->size, ptr->addr, ptr->dma);
memset(ptr, 0, sizeof(*ptr));
}
static int iwl_trans_txq_alloc(struct iwl_priv *priv, struct iwl_tx_queue *txq,
int slots_num, u32 txq_id)
{
size_t tfd_sz = priv->hw_params.tfd_size * TFD_QUEUE_SIZE_MAX;
int i;
if (WARN_ON(txq->meta || txq->cmd || txq->txb || txq->tfds))
return -EINVAL;
txq->q.n_window = slots_num;
txq->meta = kzalloc(sizeof(txq->meta[0]) * slots_num,
GFP_KERNEL);
txq->cmd = kzalloc(sizeof(txq->cmd[0]) * slots_num,
GFP_KERNEL);
if (!txq->meta || !txq->cmd)
goto error;
for (i = 0; i < slots_num; i++) {
txq->cmd[i] = kmalloc(sizeof(struct iwl_device_cmd),
GFP_KERNEL);
if (!txq->cmd[i])
goto error;
}
/* Alloc driver data array and TFD circular buffer */
/* Driver private data, only for Tx (not command) queues,
* not shared with device. */
if (txq_id != priv->cmd_queue) {
txq->txb = kzalloc(sizeof(txq->txb[0]) *
TFD_QUEUE_SIZE_MAX, GFP_KERNEL);
if (!txq->txb) {
IWL_ERR(priv, "kmalloc for auxiliary BD "
"structures failed\n");
goto error;
}
} else {
txq->txb = NULL;
}
/* Circular buffer of transmit frame descriptors (TFDs),
* shared with device */
txq->tfds = dma_alloc_coherent(priv->bus->dev, tfd_sz, &txq->q.dma_addr,
GFP_KERNEL);
if (!txq->tfds) {
IWL_ERR(priv, "dma_alloc_coherent(%zd) failed\n", tfd_sz);
goto error;
}
txq->q.id = txq_id;
return 0;
error:
kfree(txq->txb);
txq->txb = NULL;
/* since txq->cmd has been zeroed,
* all non allocated cmd[i] will be NULL */
if (txq->cmd)
for (i = 0; i < slots_num; i++)
kfree(txq->cmd[i]);
kfree(txq->meta);
kfree(txq->cmd);
txq->meta = NULL;
txq->cmd = NULL;
return -ENOMEM;
}
static int iwl_trans_txq_init(struct iwl_priv *priv, struct iwl_tx_queue *txq,
int slots_num, u32 txq_id)
{
int ret;
txq->need_update = 0;
memset(txq->meta, 0, sizeof(txq->meta[0]) * slots_num);
/*
* For the default queues 0-3, set up the swq_id
* already -- all others need to get one later
* (if they need one at all).
*/
if (txq_id < 4)
iwl_set_swq_id(txq, txq_id, txq_id);
/* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
* iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
/* Initialize queue's high/low-water marks, and head/tail indexes */
ret = iwl_queue_init(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num,
txq_id);
if (ret)
return ret;
/*
* Tell nic where to find circular buffer of Tx Frame Descriptors for
* given Tx queue, and enable the DMA channel used for that queue.
* Circular buffer (TFD queue in DRAM) physical base address */
iwl_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id),
txq->q.dma_addr >> 8);
return 0;
}
/**
* iwl_tx_queue_unmap - Unmap any remaining DMA mappings and free skb's
*/
static void iwl_tx_queue_unmap(struct iwl_priv *priv, int txq_id)
{
struct iwl_tx_queue *txq = &priv->txq[txq_id];
struct iwl_queue *q = &txq->q;
if (!q->n_bd)
return;
while (q->write_ptr != q->read_ptr) {
/* The read_ptr needs to bound by q->n_window */
iwlagn_txq_free_tfd(priv, txq, get_cmd_index(q, q->read_ptr));
q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd);
}
}
/**
* iwl_tx_queue_free - Deallocate DMA queue.
* @txq: Transmit queue to deallocate.
*
* Empty queue by removing and destroying all BD's.
* Free all buffers.
* 0-fill, but do not free "txq" descriptor structure.
*/
static void iwl_tx_queue_free(struct iwl_priv *priv, int txq_id)
{
struct iwl_tx_queue *txq = &priv->txq[txq_id];
struct device *dev = priv->bus->dev;
int i;
if (WARN_ON(!txq))
return;
iwl_tx_queue_unmap(priv, txq_id);
/* De-alloc array of command/tx buffers */
for (i = 0; i < txq->q.n_window; i++)
kfree(txq->cmd[i]);
/* De-alloc circular buffer of TFDs */
if (txq->q.n_bd) {
dma_free_coherent(dev, priv->hw_params.tfd_size *
txq->q.n_bd, txq->tfds, txq->q.dma_addr);
memset(&txq->q.dma_addr, 0, sizeof(txq->q.dma_addr));
}
/* De-alloc array of per-TFD driver data */
kfree(txq->txb);
txq->txb = NULL;
/* deallocate arrays */
kfree(txq->cmd);
kfree(txq->meta);
txq->cmd = NULL;
txq->meta = NULL;
/* 0-fill queue descriptor structure */
memset(txq, 0, sizeof(*txq));
}
/**
* iwl_trans_tx_free - Free TXQ Context
*
* Destroy all TX DMA queues and structures
*/
static void iwl_trans_tx_free(struct iwl_priv *priv)
{
int txq_id;
/* Tx queues */
if (priv->txq) {
for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
iwl_tx_queue_free(priv, txq_id);
}
kfree(priv->txq);
priv->txq = NULL;
iwlagn_free_dma_ptr(priv, &priv->kw);
iwlagn_free_dma_ptr(priv, &priv->scd_bc_tbls);
}
/**
* iwl_trans_tx_alloc - allocate TX context
* Allocate all Tx DMA structures and initialize them
*
* @param priv
* @return error code
*/
static int iwl_trans_tx_alloc(struct iwl_priv *priv)
{
int ret;
int txq_id, slots_num;
/*It is not allowed to alloc twice, so warn when this happens.
* We cannot rely on the previous allocation, so free and fail */
if (WARN_ON(priv->txq)) {
ret = -EINVAL;
goto error;
}
ret = iwlagn_alloc_dma_ptr(priv, &priv->scd_bc_tbls,
priv->hw_params.scd_bc_tbls_size);
if (ret) {
IWL_ERR(priv, "Scheduler BC Table allocation failed\n");
goto error;
}
/* Alloc keep-warm buffer */
ret = iwlagn_alloc_dma_ptr(priv, &priv->kw, IWL_KW_SIZE);
if (ret) {
IWL_ERR(priv, "Keep Warm allocation failed\n");
goto error;
}
priv->txq = kzalloc(sizeof(struct iwl_tx_queue) *
priv->cfg->base_params->num_of_queues, GFP_KERNEL);
if (!priv->txq) {
IWL_ERR(priv, "Not enough memory for txq\n");
ret = ENOMEM;
goto error;
}
/* Alloc and init all Tx queues, including the command queue (#4/#9) */
for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) {
slots_num = (txq_id == priv->cmd_queue) ?
TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
ret = iwl_trans_txq_alloc(priv, &priv->txq[txq_id], slots_num,
txq_id);
if (ret) {
IWL_ERR(priv, "Tx %d queue alloc failed\n", txq_id);
goto error;
}
}
return 0;
error:
trans_tx_free(&priv->trans);
return ret;
}
static int iwl_tx_init(struct iwl_priv *priv)
{
int ret;
int txq_id, slots_num;
unsigned long flags;
bool alloc = false;
if (!priv->txq) {
ret = iwl_trans_tx_alloc(priv);
if (ret)
goto error;
alloc = true;
}
spin_lock_irqsave(&priv->lock, flags);
/* Turn off all Tx DMA fifos */
iwl_write_prph(priv, SCD_TXFACT, 0);
/* Tell NIC where to find the "keep warm" buffer */
iwl_write_direct32(priv, FH_KW_MEM_ADDR_REG, priv->kw.dma >> 4);
spin_unlock_irqrestore(&priv->lock, flags);
/* Alloc and init all Tx queues, including the command queue (#4/#9) */
for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) {
slots_num = (txq_id == priv->cmd_queue) ?
TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
ret = iwl_trans_txq_init(priv, &priv->txq[txq_id], slots_num,
txq_id);
if (ret) {
IWL_ERR(priv, "Tx %d queue init failed\n", txq_id);
goto error;
}
}
return 0;
error:
/*Upon error, free only if we allocated something */
if (alloc)
trans_tx_free(&priv->trans);
return ret;
}
static void iwl_set_pwr_vmain(struct iwl_priv *priv)
{
/*
* (for documentation purposes)
* to set power to V_AUX, do:
if (pci_pme_capable(priv->pci_dev, PCI_D3cold))
iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
~APMG_PS_CTRL_MSK_PWR_SRC);
*/
iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
~APMG_PS_CTRL_MSK_PWR_SRC);
}
static int iwl_nic_init(struct iwl_priv *priv)
{
unsigned long flags;
/* nic_init */
spin_lock_irqsave(&priv->lock, flags);
iwl_apm_init(priv);
/* Set interrupt coalescing calibration timer to default (512 usecs) */
iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_CALIB_TIMEOUT_DEF);
spin_unlock_irqrestore(&priv->lock, flags);
iwl_set_pwr_vmain(priv);
priv->cfg->lib->nic_config(priv);
/* Allocate the RX queue, or reset if it is already allocated */
iwl_rx_init(priv);
/* Allocate or reset and init all Tx and Command queues */
if (iwl_tx_init(priv))
return -ENOMEM;
if (priv->cfg->base_params->shadow_reg_enable) {
/* enable shadow regs in HW */
iwl_set_bit(priv, CSR_MAC_SHADOW_REG_CTRL,
0x800FFFFF);
}
set_bit(STATUS_INIT, &priv->status);
return 0;
}
#define HW_READY_TIMEOUT (50)
/* Note: returns poll_bit return value, which is >= 0 if success */
static int iwl_set_hw_ready(struct iwl_priv *priv)
{
int ret;
iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
CSR_HW_IF_CONFIG_REG_BIT_NIC_READY);
/* See if we got it */
ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
HW_READY_TIMEOUT);
IWL_DEBUG_INFO(priv, "hardware%s ready\n", ret < 0 ? " not" : "");
return ret;
}
/* Note: returns standard 0/-ERROR code */
static int iwl_trans_prepare_card_hw(struct iwl_priv *priv)
{
int ret;
IWL_DEBUG_INFO(priv, "iwl_trans_prepare_card_hw enter\n");
ret = iwl_set_hw_ready(priv);
if (ret >= 0)
return 0;
/* If HW is not ready, prepare the conditions to check again */
iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
CSR_HW_IF_CONFIG_REG_PREPARE);
ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
~CSR_HW_IF_CONFIG_REG_BIT_NIC_PREPARE_DONE,
CSR_HW_IF_CONFIG_REG_BIT_NIC_PREPARE_DONE, 150000);
if (ret < 0)
return ret;
/* HW should be ready by now, check again. */
ret = iwl_set_hw_ready(priv);
if (ret >= 0)
return 0;
return ret;
}
static int iwl_trans_start_device(struct iwl_priv *priv)
{
int ret;
priv->ucode_owner = IWL_OWNERSHIP_DRIVER;
if ((priv->cfg->sku & EEPROM_SKU_CAP_AMT_ENABLE) &&
iwl_trans_prepare_card_hw(priv)) {
IWL_WARN(priv, "Exit HW not ready\n");
return -EIO;
}
/* If platform's RF_KILL switch is NOT set to KILL */
if (iwl_read32(priv, CSR_GP_CNTRL) &
CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW)
clear_bit(STATUS_RF_KILL_HW, &priv->status);
else
set_bit(STATUS_RF_KILL_HW, &priv->status);
if (iwl_is_rfkill(priv)) {
wiphy_rfkill_set_hw_state(priv->hw->wiphy, true);
iwl_enable_interrupts(priv);
return -ERFKILL;
}
iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
ret = iwl_nic_init(priv);
if (ret) {
IWL_ERR(priv, "Unable to init nic\n");
return ret;
}
/* make sure rfkill handshake bits are cleared */
iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
/* clear (again), then enable host interrupts */
iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
iwl_enable_interrupts(priv);
/* really make sure rfkill handshake bits are cleared */
iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
return 0;
}
/*
* Activate/Deactivate Tx DMA/FIFO channels according tx fifos mask
* must be called under priv->lock and mac access
*/
static void iwl_trans_txq_set_sched(struct iwl_priv *priv, u32 mask)
{
iwl_write_prph(priv, SCD_TXFACT, mask);
}
#define IWL_AC_UNSET -1
struct queue_to_fifo_ac {
s8 fifo, ac;
};
static const struct queue_to_fifo_ac iwlagn_default_queue_to_tx_fifo[] = {
{ IWL_TX_FIFO_VO, IEEE80211_AC_VO, },
{ IWL_TX_FIFO_VI, IEEE80211_AC_VI, },
{ IWL_TX_FIFO_BE, IEEE80211_AC_BE, },
{ IWL_TX_FIFO_BK, IEEE80211_AC_BK, },
{ IWLAGN_CMD_FIFO_NUM, IWL_AC_UNSET, },
{ IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
{ IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
{ IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
{ IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
{ IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
};
static const struct queue_to_fifo_ac iwlagn_ipan_queue_to_tx_fifo[] = {
{ IWL_TX_FIFO_VO, IEEE80211_AC_VO, },
{ IWL_TX_FIFO_VI, IEEE80211_AC_VI, },
{ IWL_TX_FIFO_BE, IEEE80211_AC_BE, },
{ IWL_TX_FIFO_BK, IEEE80211_AC_BK, },
{ IWL_TX_FIFO_BK_IPAN, IEEE80211_AC_BK, },
{ IWL_TX_FIFO_BE_IPAN, IEEE80211_AC_BE, },
{ IWL_TX_FIFO_VI_IPAN, IEEE80211_AC_VI, },
{ IWL_TX_FIFO_VO_IPAN, IEEE80211_AC_VO, },
{ IWL_TX_FIFO_BE_IPAN, 2, },
{ IWLAGN_CMD_FIFO_NUM, IWL_AC_UNSET, },
};
static void iwl_trans_tx_start(struct iwl_priv *priv)
{
const struct queue_to_fifo_ac *queue_to_fifo;
struct iwl_rxon_context *ctx;
u32 a;
unsigned long flags;
int i, chan;
u32 reg_val;
spin_lock_irqsave(&priv->lock, flags);
priv->scd_base_addr = iwl_read_prph(priv, SCD_SRAM_BASE_ADDR);
a = priv->scd_base_addr + SCD_CONTEXT_MEM_LOWER_BOUND;
/* reset conext data memory */
for (; a < priv->scd_base_addr + SCD_CONTEXT_MEM_UPPER_BOUND;
a += 4)
iwl_write_targ_mem(priv, a, 0);
/* reset tx status memory */
for (; a < priv->scd_base_addr + SCD_TX_STTS_MEM_UPPER_BOUND;
a += 4)
iwl_write_targ_mem(priv, a, 0);
for (; a < priv->scd_base_addr +
SCD_TRANS_TBL_OFFSET_QUEUE(priv->hw_params.max_txq_num); a += 4)
iwl_write_targ_mem(priv, a, 0);
iwl_write_prph(priv, SCD_DRAM_BASE_ADDR,
priv->scd_bc_tbls.dma >> 10);
/* Enable DMA channel */
for (chan = 0; chan < FH_TCSR_CHNL_NUM ; chan++)
iwl_write_direct32(priv, FH_TCSR_CHNL_TX_CONFIG_REG(chan),
FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE);
/* Update FH chicken bits */
reg_val = iwl_read_direct32(priv, FH_TX_CHICKEN_BITS_REG);
iwl_write_direct32(priv, FH_TX_CHICKEN_BITS_REG,
reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN);
iwl_write_prph(priv, SCD_QUEUECHAIN_SEL,
SCD_QUEUECHAIN_SEL_ALL(priv));
iwl_write_prph(priv, SCD_AGGR_SEL, 0);
/* initiate the queues */
for (i = 0; i < priv->hw_params.max_txq_num; i++) {
iwl_write_prph(priv, SCD_QUEUE_RDPTR(i), 0);
iwl_write_direct32(priv, HBUS_TARG_WRPTR, 0 | (i << 8));
iwl_write_targ_mem(priv, priv->scd_base_addr +
SCD_CONTEXT_QUEUE_OFFSET(i), 0);
iwl_write_targ_mem(priv, priv->scd_base_addr +
SCD_CONTEXT_QUEUE_OFFSET(i) +
sizeof(u32),
((SCD_WIN_SIZE <<
SCD_QUEUE_CTX_REG2_WIN_SIZE_POS) &
SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK) |
((SCD_FRAME_LIMIT <<
SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK));
}
iwl_write_prph(priv, SCD_INTERRUPT_MASK,
IWL_MASK(0, priv->hw_params.max_txq_num));
/* Activate all Tx DMA/FIFO channels */
iwl_trans_txq_set_sched(priv, IWL_MASK(0, 7));
/* map queues to FIFOs */
if (priv->valid_contexts != BIT(IWL_RXON_CTX_BSS))
queue_to_fifo = iwlagn_ipan_queue_to_tx_fifo;
else
queue_to_fifo = iwlagn_default_queue_to_tx_fifo;
iwl_trans_set_wr_ptrs(priv, priv->cmd_queue, 0);
/* make sure all queue are not stopped */
memset(&priv->queue_stopped[0], 0, sizeof(priv->queue_stopped));
for (i = 0; i < 4; i++)
atomic_set(&priv->queue_stop_count[i], 0);
for_each_context(priv, ctx)
ctx->last_tx_rejected = false;
/* reset to 0 to enable all the queue first */
priv->txq_ctx_active_msk = 0;
BUILD_BUG_ON(ARRAY_SIZE(iwlagn_default_queue_to_tx_fifo) != 10);
BUILD_BUG_ON(ARRAY_SIZE(iwlagn_ipan_queue_to_tx_fifo) != 10);
for (i = 0; i < 10; i++) {
int fifo = queue_to_fifo[i].fifo;
int ac = queue_to_fifo[i].ac;
iwl_txq_ctx_activate(priv, i);
if (fifo == IWL_TX_FIFO_UNUSED)
continue;
if (ac != IWL_AC_UNSET)
iwl_set_swq_id(&priv->txq[i], ac, i);
iwl_trans_tx_queue_set_status(priv, &priv->txq[i], fifo, 0);
}
spin_unlock_irqrestore(&priv->lock, flags);
/* Enable L1-Active */
iwl_clear_bits_prph(priv, APMG_PCIDEV_STT_REG,
APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
}
/**
* iwlagn_txq_ctx_stop - Stop all Tx DMA channels
*/
static int iwl_trans_tx_stop(struct iwl_priv *priv)
{
int ch, txq_id;
unsigned long flags;
/* Turn off all Tx DMA fifos */
spin_lock_irqsave(&priv->lock, flags);
iwl_trans_txq_set_sched(priv, 0);
/* Stop each Tx DMA channel, and wait for it to be idle */
for (ch = 0; ch < FH_TCSR_CHNL_NUM; ch++) {
iwl_write_direct32(priv, FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0);
if (iwl_poll_direct_bit(priv, FH_TSSR_TX_STATUS_REG,
FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch),
1000))
IWL_ERR(priv, "Failing on timeout while stopping"
" DMA channel %d [0x%08x]", ch,
iwl_read_direct32(priv, FH_TSSR_TX_STATUS_REG));
}
spin_unlock_irqrestore(&priv->lock, flags);
if (!priv->txq) {
IWL_WARN(priv, "Stopping tx queues that aren't allocated...");
return 0;
}
/* Unmap DMA from host system and free skb's */
for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
iwl_tx_queue_unmap(priv, txq_id);
return 0;
}
static void iwl_trans_stop_device(struct iwl_priv *priv)
{
unsigned long flags;
/* stop and reset the on-board processor */
iwl_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET);
/* tell the device to stop sending interrupts */
spin_lock_irqsave(&priv->lock, flags);
iwl_disable_interrupts(priv);
spin_unlock_irqrestore(&priv->lock, flags);
trans_sync_irq(&priv->trans);
/* device going down, Stop using ICT table */
iwl_disable_ict(priv);
/*
* If a HW restart happens during firmware loading,
* then the firmware loading might call this function
* and later it might be called again due to the
* restart. So don't process again if the device is
* already dead.
*/
if (test_bit(STATUS_DEVICE_ENABLED, &priv->status)) {
iwl_trans_tx_stop(priv);
iwl_trans_rx_stop(priv);
/* Power-down device's busmaster DMA clocks */
iwl_write_prph(priv, APMG_CLK_DIS_REG,
APMG_CLK_VAL_DMA_CLK_RQT);
udelay(5);
}
/* Make sure (redundant) we've released our request to stay awake */
iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
/* Stop the device, and put it in low power state */
iwl_apm_stop(priv);
}
static struct iwl_tx_cmd *iwl_trans_get_tx_cmd(struct iwl_priv *priv,
int txq_id)
{
struct iwl_tx_queue *txq = &priv->txq[txq_id];
struct iwl_queue *q = &txq->q;
struct iwl_device_cmd *dev_cmd;
if (unlikely(iwl_queue_space(q) < q->high_mark))
return NULL;
/*
* Set up the Tx-command (not MAC!) header.
* Store the chosen Tx queue and TFD index within the sequence field;
* after Tx, uCode's Tx response will return this value so driver can
* locate the frame within the tx queue and do post-tx processing.
*/
dev_cmd = txq->cmd[q->write_ptr];
memset(dev_cmd, 0, sizeof(*dev_cmd));
dev_cmd->hdr.cmd = REPLY_TX;
dev_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
INDEX_TO_SEQ(q->write_ptr)));
return &dev_cmd->cmd.tx;
}
static int iwl_trans_tx(struct iwl_priv *priv, struct sk_buff *skb,
struct iwl_tx_cmd *tx_cmd, int txq_id, __le16 fc, bool ampdu,
struct iwl_rxon_context *ctx)
{
struct iwl_tx_queue *txq = &priv->txq[txq_id];
struct iwl_queue *q = &txq->q;
struct iwl_device_cmd *dev_cmd = txq->cmd[q->write_ptr];
struct iwl_cmd_meta *out_meta;
dma_addr_t phys_addr = 0;
dma_addr_t txcmd_phys;
dma_addr_t scratch_phys;
u16 len, firstlen, secondlen;
u8 wait_write_ptr = 0;
u8 hdr_len = ieee80211_hdrlen(fc);
/* Set up driver data for this TFD */
memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info));
txq->txb[q->write_ptr].skb = skb;
txq->txb[q->write_ptr].ctx = ctx;
/* Set up first empty entry in queue's array of Tx/cmd buffers */
out_meta = &txq->meta[q->write_ptr];
/*
* Use the first empty entry in this queue's command buffer array
* to contain the Tx command and MAC header concatenated together
* (payload data will be in another buffer).
* Size of this varies, due to varying MAC header length.
* If end is not dword aligned, we'll have 2 extra bytes at the end
* of the MAC header (device reads on dword boundaries).
* We'll tell device about this padding later.
*/
len = sizeof(struct iwl_tx_cmd) +
sizeof(struct iwl_cmd_header) + hdr_len;
firstlen = (len + 3) & ~3;
/* Tell NIC about any 2-byte padding after MAC header */
if (firstlen != len)
tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
/* Physical address of this Tx command's header (not MAC header!),
* within command buffer array. */
txcmd_phys = dma_map_single(priv->bus->dev,
&dev_cmd->hdr, firstlen,
DMA_BIDIRECTIONAL);
if (unlikely(dma_mapping_error(priv->bus->dev, txcmd_phys)))
return -1;
dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
dma_unmap_len_set(out_meta, len, firstlen);
if (!ieee80211_has_morefrags(fc)) {
txq->need_update = 1;
} else {
wait_write_ptr = 1;
txq->need_update = 0;
}
/* Set up TFD's 2nd entry to point directly to remainder of skb,
* if any (802.11 null frames have no payload). */
secondlen = skb->len - hdr_len;
if (secondlen > 0) {
phys_addr = dma_map_single(priv->bus->dev, skb->data + hdr_len,
secondlen, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(priv->bus->dev, phys_addr))) {
dma_unmap_single(priv->bus->dev,
dma_unmap_addr(out_meta, mapping),
dma_unmap_len(out_meta, len),
DMA_BIDIRECTIONAL);
return -1;
}
}
/* Attach buffers to TFD */
iwlagn_txq_attach_buf_to_tfd(priv, txq, txcmd_phys, firstlen, 1);
if (secondlen > 0)
iwlagn_txq_attach_buf_to_tfd(priv, txq, phys_addr,
secondlen, 0);
scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) +
offsetof(struct iwl_tx_cmd, scratch);
/* take back ownership of DMA buffer to enable update */
dma_sync_single_for_cpu(priv->bus->dev, txcmd_phys, firstlen,
DMA_BIDIRECTIONAL);
tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
tx_cmd->dram_msb_ptr = iwl_get_dma_hi_addr(scratch_phys);
IWL_DEBUG_TX(priv, "sequence nr = 0X%x\n",
le16_to_cpu(dev_cmd->hdr.sequence));
IWL_DEBUG_TX(priv, "tx_flags = 0X%x\n", le32_to_cpu(tx_cmd->tx_flags));
iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd, sizeof(*tx_cmd));
iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd->hdr, hdr_len);
/* Set up entry for this TFD in Tx byte-count array */
if (ampdu)
iwl_trans_txq_update_byte_cnt_tbl(priv, txq,
le16_to_cpu(tx_cmd->len));
dma_sync_single_for_device(priv->bus->dev, txcmd_phys, firstlen,
DMA_BIDIRECTIONAL);
trace_iwlwifi_dev_tx(priv,
&((struct iwl_tfd *)txq->tfds)[txq->q.write_ptr],
sizeof(struct iwl_tfd),
&dev_cmd->hdr, firstlen,
skb->data + hdr_len, secondlen);
/* Tell device the write index *just past* this latest filled TFD */
q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
iwl_txq_update_write_ptr(priv, txq);
/*
* At this point the frame is "transmitted" successfully
* and we will get a TX status notification eventually,
* regardless of the value of ret. "ret" only indicates
* whether or not we should update the write pointer.
*/
if ((iwl_queue_space(q) < q->high_mark) && priv->mac80211_registered) {
if (wait_write_ptr) {
txq->need_update = 1;
iwl_txq_update_write_ptr(priv, txq);
} else {
iwl_stop_queue(priv, txq);
}
}
return 0;
}
static void iwl_trans_kick_nic(struct iwl_priv *priv)
{
/* Remove all resets to allow NIC to operate */
iwl_write32(priv, CSR_RESET, 0);
}
static void iwl_trans_sync_irq(struct iwl_priv *priv)
{
/* wait to make sure we flush pending tasklet*/
synchronize_irq(priv->bus->irq);
tasklet_kill(&priv->irq_tasklet);
}
static void iwl_trans_free(struct iwl_priv *priv)
{
free_irq(priv->bus->irq, priv);
iwl_free_isr_ict(priv);
}
static const struct iwl_trans_ops trans_ops = {
.start_device = iwl_trans_start_device,
.prepare_card_hw = iwl_trans_prepare_card_hw,
.stop_device = iwl_trans_stop_device,
.tx_start = iwl_trans_tx_start,
.rx_free = iwl_trans_rx_free,
.tx_free = iwl_trans_tx_free,
.send_cmd = iwl_send_cmd,
.send_cmd_pdu = iwl_send_cmd_pdu,
.get_tx_cmd = iwl_trans_get_tx_cmd,
.tx = iwl_trans_tx,
.txq_agg_disable = iwl_trans_txq_agg_disable,
.txq_agg_setup = iwl_trans_txq_agg_setup,
.kick_nic = iwl_trans_kick_nic,
.sync_irq = iwl_trans_sync_irq,
.free = iwl_trans_free,
};
int iwl_trans_register(struct iwl_trans *trans, struct iwl_priv *priv)
{
int err;
priv->trans.ops = &trans_ops;
priv->trans.priv = priv;
tasklet_init(&priv->irq_tasklet, (void (*)(unsigned long))
iwl_irq_tasklet, (unsigned long)priv);
iwl_alloc_isr_ict(priv);
err = request_irq(priv->bus->irq, iwl_isr_ict, IRQF_SHARED,
DRV_NAME, priv);
if (err) {
IWL_ERR(priv, "Error allocating IRQ %d\n", priv->bus->irq);
iwl_free_isr_ict(priv);
return err;
}
INIT_WORK(&priv->rx_replenish, iwl_bg_rx_replenish);
return 0;
}
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