1/******************************************************************************
  2 *
  3 * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
  4 *
  5 * Portions of this file are derived from the ipw3945 project, as well
  6 * as portions of the ieee80211 subsystem header files.
  7 *
  8 * This program is free software; you can redistribute it and/or modify it
  9 * under the terms of version 2 of the GNU General Public License as
 10 * published by the Free Software Foundation.
 11 *
 12 * This program is distributed in the hope that it will be useful, but WITHOUT
 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 14 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 15 * more details.
 16 *
 17 * You should have received a copy of the GNU General Public License along with
 18 * this program; if not, write to the Free Software Foundation, Inc.,
 19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 20 *
 21 * The full GNU General Public License is included in this distribution in the
 22 * file called LICENSE.
 23 *
 24 * Contact Information:
 25 *  Intel Linux Wireless <ilw@linux.intel.com>
 26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 27 *
 28 *****************************************************************************/
 29
 30#ifndef __iwl_legacy_helpers_h__
 31#define __iwl_legacy_helpers_h__
 32
 33#include <linux/ctype.h>
 34#include <net/mac80211.h>
 35
 36#include "iwl-io.h"
 37
 38#define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))
 39
 40
 41static inline struct ieee80211_conf *iwl_legacy_ieee80211_get_hw_conf(
 42	struct ieee80211_hw *hw)
 43{
 44	return &hw->conf;
 45}
 46
 47/**
 48 * iwl_legacy_queue_inc_wrap - increment queue index, wrap back to beginning
 49 * @index -- current index
 50 * @n_bd -- total number of entries in queue (must be power of 2)
 51 */
 52static inline int iwl_legacy_queue_inc_wrap(int index, int n_bd)
 53{
 54	return ++index & (n_bd - 1);
 55}
 56
 57/**
 58 * iwl_legacy_queue_dec_wrap - decrement queue index, wrap back to end
 59 * @index -- current index
 60 * @n_bd -- total number of entries in queue (must be power of 2)
 61 */
 62static inline int iwl_legacy_queue_dec_wrap(int index, int n_bd)
 63{
 64	return --index & (n_bd - 1);
 65}
 66
 67/* TODO: Move fw_desc functions to iwl-pci.ko */
 68static inline void iwl_legacy_free_fw_desc(struct pci_dev *pci_dev,
 69				    struct fw_desc *desc)
 70{
 71	if (desc->v_addr)
 72		dma_free_coherent(&pci_dev->dev, desc->len,
 73				  desc->v_addr, desc->p_addr);
 74	desc->v_addr = NULL;
 75	desc->len = 0;
 76}
 77
 78static inline int iwl_legacy_alloc_fw_desc(struct pci_dev *pci_dev,
 79				    struct fw_desc *desc)
 80{
 81	if (!desc->len) {
 82		desc->v_addr = NULL;
 83		return -EINVAL;
 84	}
 85
 86	desc->v_addr = dma_alloc_coherent(&pci_dev->dev, desc->len,
 87					  &desc->p_addr, GFP_KERNEL);
 88	return (desc->v_addr != NULL) ? 0 : -ENOMEM;
 89}
 90
 91/*
 92 * we have 8 bits used like this:
 93 *
 94 * 7 6 5 4 3 2 1 0
 95 * | | | | | | | |
 96 * | | | | | | +-+-------- AC queue (0-3)
 97 * | | | | | |
 98 * | +-+-+-+-+------------ HW queue ID
 99 * |
100 * +---------------------- unused
101 */
102static inline void
103iwl_legacy_set_swq_id(struct iwl_tx_queue *txq, u8 ac, u8 hwq)
104{
105	BUG_ON(ac > 3);   /* only have 2 bits */
106	BUG_ON(hwq > 31); /* only use 5 bits */
107
108	txq->swq_id = (hwq << 2) | ac;
109}
110
111static inline void iwl_legacy_wake_queue(struct iwl_priv *priv,
112				  struct iwl_tx_queue *txq)
113{
114	u8 queue = txq->swq_id;
115	u8 ac = queue & 3;
116	u8 hwq = (queue >> 2) & 0x1f;
117
118	if (test_and_clear_bit(hwq, priv->queue_stopped))
119		if (atomic_dec_return(&priv->queue_stop_count[ac]) <= 0)
120			ieee80211_wake_queue(priv->hw, ac);
121}
122
123static inline void iwl_legacy_stop_queue(struct iwl_priv *priv,
124				  struct iwl_tx_queue *txq)
125{
126	u8 queue = txq->swq_id;
127	u8 ac = queue & 3;
128	u8 hwq = (queue >> 2) & 0x1f;
129
130	if (!test_and_set_bit(hwq, priv->queue_stopped))
131		if (atomic_inc_return(&priv->queue_stop_count[ac]) > 0)
132			ieee80211_stop_queue(priv->hw, ac);
133}
134
135#ifdef ieee80211_stop_queue
136#undef ieee80211_stop_queue
137#endif
138
139#define ieee80211_stop_queue DO_NOT_USE_ieee80211_stop_queue
140
141#ifdef ieee80211_wake_queue
142#undef ieee80211_wake_queue
143#endif
144
145#define ieee80211_wake_queue DO_NOT_USE_ieee80211_wake_queue
146
147static inline void iwl_legacy_disable_interrupts(struct iwl_priv *priv)
148{
149	clear_bit(STATUS_INT_ENABLED, &priv->status);
150
151	/* disable interrupts from uCode/NIC to host */
152	iwl_write32(priv, CSR_INT_MASK, 0x00000000);
153
154	/* acknowledge/clear/reset any interrupts still pending
155	 * from uCode or flow handler (Rx/Tx DMA) */
156	iwl_write32(priv, CSR_INT, 0xffffffff);
157	iwl_write32(priv, CSR_FH_INT_STATUS, 0xffffffff);
158	IWL_DEBUG_ISR(priv, "Disabled interrupts\n");
159}
160
161static inline void iwl_legacy_enable_rfkill_int(struct iwl_priv *priv)
162{
163	IWL_DEBUG_ISR(priv, "Enabling rfkill interrupt\n");
164	iwl_write32(priv, CSR_INT_MASK, CSR_INT_BIT_RF_KILL);
165}
166
167static inline void iwl_legacy_enable_interrupts(struct iwl_priv *priv)
168{
169	IWL_DEBUG_ISR(priv, "Enabling interrupts\n");
170	set_bit(STATUS_INT_ENABLED, &priv->status);
171	iwl_write32(priv, CSR_INT_MASK, priv->inta_mask);
172}
173
174/**
175 * iwl_legacy_beacon_time_mask_low - mask of lower 32 bit of beacon time
176 * @priv -- pointer to iwl_priv data structure
177 * @tsf_bits -- number of bits need to shift for masking)
178 */
179static inline u32 iwl_legacy_beacon_time_mask_low(struct iwl_priv *priv,
180					   u16 tsf_bits)
181{
182	return (1 << tsf_bits) - 1;
183}
184
185/**
186 * iwl_legacy_beacon_time_mask_high - mask of higher 32 bit of beacon time
187 * @priv -- pointer to iwl_priv data structure
188 * @tsf_bits -- number of bits need to shift for masking)
189 */
190static inline u32 iwl_legacy_beacon_time_mask_high(struct iwl_priv *priv,
191					    u16 tsf_bits)
192{
193	return ((1 << (32 - tsf_bits)) - 1) << tsf_bits;
194}
195
196#endif				/* __iwl_legacy_helpers_h__ */