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/******************************************************************************
*
* Copyright(c) 2003 - 2010 Intel Corporation. All rights reserved.
*
* Portions of this file are derived from the ipw3945 project, as well
* as portions of the ieee80211 subsystem header files.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
*****************************************************************************/
#ifndef __iwl_helpers_h__
#define __iwl_helpers_h__
#include <linux/ctype.h>
#include <net/mac80211.h>
#include "iwl-io.h"
#define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))
static inline struct ieee80211_conf *ieee80211_get_hw_conf(
struct ieee80211_hw *hw)
{
return &hw->conf;
}
static inline unsigned long elapsed_jiffies(unsigned long start,
unsigned long end)
{
if (end >= start)
return end - start;
return end + (MAX_JIFFY_OFFSET - start) + 1;
}
/**
* iwl_queue_inc_wrap - increment queue index, wrap back to beginning
* @index -- current index
* @n_bd -- total number of entries in queue (must be power of 2)
*/
static inline int iwl_queue_inc_wrap(int index, int n_bd)
{
return ++index & (n_bd - 1);
}
/**
* iwl_queue_dec_wrap - decrement queue index, wrap back to end
* @index -- current index
* @n_bd -- total number of entries in queue (must be power of 2)
*/
static inline int iwl_queue_dec_wrap(int index, int n_bd)
{
return --index & (n_bd - 1);
}
/* TODO: Move fw_desc functions to iwl-pci.ko */
static inline void iwl_free_fw_desc(struct pci_dev *pci_dev,
struct fw_desc *desc)
{
if (desc->v_addr)
dma_free_coherent(&pci_dev->dev, desc->len,
desc->v_addr, desc->p_addr);
desc->v_addr = NULL;
desc->len = 0;
}
static inline int iwl_alloc_fw_desc(struct pci_dev *pci_dev,
struct fw_desc *desc)
{
if (!desc->len) {
desc->v_addr = NULL;
return -EINVAL;
}
desc->v_addr = dma_alloc_coherent(&pci_dev->dev, desc->len,
&desc->p_addr, GFP_KERNEL);
return (desc->v_addr != NULL) ? 0 : -ENOMEM;
}
/*
* we have 8 bits used like this:
*
* 7 6 5 4 3 2 1 0
* | | | | | | | |
* | | | | | | +-+-------- AC queue (0-3)
* | | | | | |
* | +-+-+-+-+------------ HW queue ID
* |
* +---------------------- unused
*/
static inline void iwl_set_swq_id(struct iwl_tx_queue *txq, u8 ac, u8 hwq)
{
BUG_ON(ac > 3); /* only have 2 bits */
BUG_ON(hwq > 31); /* only use 5 bits */
txq->swq_id = (hwq << 2) | ac;
}
static inline void iwl_wake_queue(struct iwl_priv *priv,
struct iwl_tx_queue *txq)
{
u8 queue = txq->swq_id;
u8 ac = queue & 3;
u8 hwq = (queue >> 2) & 0x1f;
if (test_and_clear_bit(hwq, priv->queue_stopped))
if (atomic_dec_return(&priv->queue_stop_count[ac]) <= 0)
ieee80211_wake_queue(priv->hw, ac);
}
static inline void iwl_stop_queue(struct iwl_priv *priv,
struct iwl_tx_queue *txq)
{
u8 queue = txq->swq_id;
u8 ac = queue & 3;
u8 hwq = (queue >> 2) & 0x1f;
if (!test_and_set_bit(hwq, priv->queue_stopped))
if (atomic_inc_return(&priv->queue_stop_count[ac]) > 0)
ieee80211_stop_queue(priv->hw, ac);
}
#define ieee80211_stop_queue DO_NOT_USE_ieee80211_stop_queue
#define ieee80211_wake_queue DO_NOT_USE_ieee80211_wake_queue
static inline void iwl_disable_interrupts(struct iwl_priv *priv)
{
clear_bit(STATUS_INT_ENABLED, &priv->status);
/* disable interrupts from uCode/NIC to host */
iwl_write32(priv, CSR_INT_MASK, 0x00000000);
/* acknowledge/clear/reset any interrupts still pending
* from uCode or flow handler (Rx/Tx DMA) */
iwl_write32(priv, CSR_INT, 0xffffffff);
iwl_write32(priv, CSR_FH_INT_STATUS, 0xffffffff);
IWL_DEBUG_ISR(priv, "Disabled interrupts\n");
}
static inline void iwl_enable_interrupts(struct iwl_priv *priv)
{
IWL_DEBUG_ISR(priv, "Enabling interrupts\n");
set_bit(STATUS_INT_ENABLED, &priv->status);
iwl_write32(priv, CSR_INT_MASK, priv->inta_mask);
}
/**
* iwl_beacon_time_mask_low - mask of lower 32 bit of beacon time
* @priv -- pointer to iwl_priv data structure
* @tsf_bits -- number of bits need to shift for masking)
*/
static inline u32 iwl_beacon_time_mask_low(struct iwl_priv *priv,
u16 tsf_bits)
{
return (1 << tsf_bits) - 1;
}
/**
* iwl_beacon_time_mask_high - mask of higher 32 bit of beacon time
* @priv -- pointer to iwl_priv data structure
* @tsf_bits -- number of bits need to shift for masking)
*/
static inline u32 iwl_beacon_time_mask_high(struct iwl_priv *priv,
u16 tsf_bits)
{
return ((1 << (32 - tsf_bits)) - 1) << tsf_bits;
}
#endif /* __iwl_helpers_h__ */
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