iwlagn: move all the ICT related functions to iwl-trans-rx-pcie.c

Since the ICT is transport related, move all its functions to the transport
layer.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

6 files changed, 297 insertions, 315 deletions

diff --git a/drivers/net/wireless/iwlwifi/Makefile b/drivers/net/wireless/iwlwifi/Makefile
index 1468e16..48ab914 100644
--- a/drivers/net/wireless/iwlwifi/Makefile
+++ b/drivers/net/wireless/iwlwifi/Makefile
@@ -8,7 +8,7 @@ iwlagn-objs		+= iwl-agn-tt.o iwl-agn-sta.o iwl-agn-eeprom.o
 iwlagn-objs 		+= iwl-core.o iwl-eeprom.o iwl-power.o
 iwlagn-objs 		+= iwl-rx.o iwl-sta.o
 iwlagn-objs 		+= iwl-scan.o iwl-led.o
-iwlagn-objs             += iwl-agn-rxon.o iwl-agn-ict.o
+iwlagn-objs             += iwl-agn-rxon.o
 iwlagn-objs             += iwl-5000.o
 iwlagn-objs             += iwl-6000.o
 iwlagn-objs             += iwl-1000.o
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-ict.c b/drivers/net/wireless/iwlwifi/iwl-agn-ict.c
deleted file mode 100644
index 9a2eb1e..0000000
--- a/drivers/net/wireless/iwlwifi/iwl-agn-ict.c
+++ /dev/null
@@ -1,310 +0,0 @@
-/******************************************************************************
- *
- * GPL LICENSE SUMMARY
- *
- * Copyright(c) 2008 - 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
- *****************************************************************************/
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/etherdevice.h>
-#include <linux/sched.h>
-#include <linux/gfp.h>
-#include <net/mac80211.h>
-
-#include "iwl-dev.h"
-#include "iwl-core.h"
-#include "iwl-agn.h"
-#include "iwl-helpers.h"
-
-#define ICT_COUNT (PAGE_SIZE/sizeof(u32))
-
-/* Free dram table */
-void iwl_free_isr_ict(struct iwl_priv *priv)
-{
-	if (priv->_agn.ict_tbl_vir) {
-		dma_free_coherent(priv->bus.dev,
-				  (sizeof(u32) * ICT_COUNT) + PAGE_SIZE,
-				  priv->_agn.ict_tbl_vir,
-				  priv->_agn.ict_tbl_dma);
-		priv->_agn.ict_tbl_vir = NULL;
-		memset(&priv->_agn.ict_tbl_dma, 0,
-			sizeof(priv->_agn.ict_tbl_dma));
-		memset(&priv->_agn.aligned_ict_tbl_dma, 0,
-			sizeof(priv->_agn.aligned_ict_tbl_dma));
-	}
-}
-
-
-/* allocate dram shared table it is a PAGE_SIZE aligned
- * also reset all data related to ICT table interrupt.
- */
-int iwl_alloc_isr_ict(struct iwl_priv *priv)
-{
-
-	/* allocate shrared data table */
-	priv->_agn.ict_tbl_vir =
-		dma_alloc_coherent(priv->bus.dev,
-				   (sizeof(u32) * ICT_COUNT) + PAGE_SIZE,
-				   &priv->_agn.ict_tbl_dma, GFP_KERNEL);
-	if (!priv->_agn.ict_tbl_vir)
-		return -ENOMEM;
-
-	/* align table to PAGE_SIZE boundary */
-	priv->_agn.aligned_ict_tbl_dma = ALIGN(priv->_agn.ict_tbl_dma, PAGE_SIZE);
-
-	IWL_DEBUG_ISR(priv, "ict dma addr %Lx dma aligned %Lx diff %d\n",
-			     (unsigned long long)priv->_agn.ict_tbl_dma,
-			     (unsigned long long)priv->_agn.aligned_ict_tbl_dma,
-			(int)(priv->_agn.aligned_ict_tbl_dma - priv->_agn.ict_tbl_dma));
-
-	priv->_agn.ict_tbl =  priv->_agn.ict_tbl_vir +
-			  (priv->_agn.aligned_ict_tbl_dma - priv->_agn.ict_tbl_dma);
-
-	IWL_DEBUG_ISR(priv, "ict vir addr %p vir aligned %p diff %d\n",
-			     priv->_agn.ict_tbl, priv->_agn.ict_tbl_vir,
-			(int)(priv->_agn.aligned_ict_tbl_dma - priv->_agn.ict_tbl_dma));
-
-	/* reset table and index to all 0 */
-	memset(priv->_agn.ict_tbl_vir,0, (sizeof(u32) * ICT_COUNT) + PAGE_SIZE);
-	priv->_agn.ict_index = 0;
-
-	/* add periodic RX interrupt */
-	priv->inta_mask |= CSR_INT_BIT_RX_PERIODIC;
-	return 0;
-}
-
-/* Device is going up inform it about using ICT interrupt table,
- * also we need to tell the driver to start using ICT interrupt.
- */
-int iwl_reset_ict(struct iwl_priv *priv)
-{
-	u32 val;
-	unsigned long flags;
-
-	if (!priv->_agn.ict_tbl_vir)
-		return 0;
-
-	spin_lock_irqsave(&priv->lock, flags);
-	iwl_disable_interrupts(priv);
-
-	memset(&priv->_agn.ict_tbl[0], 0, sizeof(u32) * ICT_COUNT);
-
-	val = priv->_agn.aligned_ict_tbl_dma >> PAGE_SHIFT;
-
-	val |= CSR_DRAM_INT_TBL_ENABLE;
-	val |= CSR_DRAM_INIT_TBL_WRAP_CHECK;
-
-	IWL_DEBUG_ISR(priv, "CSR_DRAM_INT_TBL_REG =0x%X "
-			"aligned dma address %Lx\n",
-			val, (unsigned long long)priv->_agn.aligned_ict_tbl_dma);
-
-	iwl_write32(priv, CSR_DRAM_INT_TBL_REG, val);
-	priv->_agn.use_ict = true;
-	priv->_agn.ict_index = 0;
-	iwl_write32(priv, CSR_INT, priv->inta_mask);
-	iwl_enable_interrupts(priv);
-	spin_unlock_irqrestore(&priv->lock, flags);
-
-	return 0;
-}
-
-/* Device is going down disable ict interrupt usage */
-void iwl_disable_ict(struct iwl_priv *priv)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&priv->lock, flags);
-	priv->_agn.use_ict = false;
-	spin_unlock_irqrestore(&priv->lock, flags);
-}
-
-static irqreturn_t iwl_isr(int irq, void *data)
-{
-	struct iwl_priv *priv = data;
-	u32 inta, inta_mask;
-	unsigned long flags;
-#ifdef CONFIG_IWLWIFI_DEBUG
-	u32 inta_fh;
-#endif
-	if (!priv)
-		return IRQ_NONE;
-
-	spin_lock_irqsave(&priv->lock, flags);
-
-	/* Disable (but don't clear!) interrupts here to avoid
-	 *    back-to-back ISRs and sporadic interrupts from our NIC.
-	 * If we have something to service, the tasklet will re-enable ints.
-	 * If we *don't* have something, we'll re-enable before leaving here. */
-	inta_mask = iwl_read32(priv, CSR_INT_MASK);  /* just for debug */
-	iwl_write32(priv, CSR_INT_MASK, 0x00000000);
-
-	/* Discover which interrupts are active/pending */
-	inta = iwl_read32(priv, CSR_INT);
-
-	/* Ignore interrupt if there's nothing in NIC to service.
-	 * This may be due to IRQ shared with another device,
-	 * or due to sporadic interrupts thrown from our NIC. */
-	if (!inta) {
-		IWL_DEBUG_ISR(priv, "Ignore interrupt, inta == 0\n");
-		goto none;
-	}
-
-	if ((inta == 0xFFFFFFFF) || ((inta & 0xFFFFFFF0) == 0xa5a5a5a0)) {
-		/* Hardware disappeared. It might have already raised
-		 * an interrupt */
-		IWL_WARN(priv, "HARDWARE GONE?? INTA == 0x%08x\n", inta);
-		goto unplugged;
-	}
-
-#ifdef CONFIG_IWLWIFI_DEBUG
-	if (iwl_get_debug_level(priv) & (IWL_DL_ISR)) {
-		inta_fh = iwl_read32(priv, CSR_FH_INT_STATUS);
-		IWL_DEBUG_ISR(priv, "ISR inta 0x%08x, enabled 0x%08x, "
-			      "fh 0x%08x\n", inta, inta_mask, inta_fh);
-	}
-#endif
-
-	priv->_agn.inta |= inta;
-	/* iwl_irq_tasklet() will service interrupts and re-enable them */
-	if (likely(inta))
-		tasklet_schedule(&priv->irq_tasklet);
-	else if (test_bit(STATUS_INT_ENABLED, &priv->status) && !priv->_agn.inta)
-		iwl_enable_interrupts(priv);
-
- unplugged:
-	spin_unlock_irqrestore(&priv->lock, flags);
-	return IRQ_HANDLED;
-
- none:
-	/* re-enable interrupts here since we don't have anything to service. */
-	/* only Re-enable if disabled by irq  and no schedules tasklet. */
-	if (test_bit(STATUS_INT_ENABLED, &priv->status) && !priv->_agn.inta)
-		iwl_enable_interrupts(priv);
-
-	spin_unlock_irqrestore(&priv->lock, flags);
-	return IRQ_NONE;
-}
-
-/* interrupt handler using ict table, with this interrupt driver will
- * stop using INTA register to get device's interrupt, reading this register
- * is expensive, device will write interrupts in ICT dram table, increment
- * index then will fire interrupt to driver, driver will OR all ICT table
- * entries from current index up to table entry with 0 value. the result is
- * the interrupt we need to service, driver will set the entries back to 0 and
- * set index.
- */
-irqreturn_t iwl_isr_ict(int irq, void *data)
-{
-	struct iwl_priv *priv = data;
-	u32 inta, inta_mask;
-	u32 val = 0;
-	unsigned long flags;
-
-	if (!priv)
-		return IRQ_NONE;
-
-	/* dram interrupt table not set yet,
-	 * use legacy interrupt.
-	 */
-	if (!priv->_agn.use_ict)
-		return iwl_isr(irq, data);
-
-	spin_lock_irqsave(&priv->lock, flags);
-
-	/* Disable (but don't clear!) interrupts here to avoid
-	 * back-to-back ISRs and sporadic interrupts from our NIC.
-	 * If we have something to service, the tasklet will re-enable ints.
-	 * If we *don't* have something, we'll re-enable before leaving here.
-	 */
-	inta_mask = iwl_read32(priv, CSR_INT_MASK);  /* just for debug */
-	iwl_write32(priv, CSR_INT_MASK, 0x00000000);
-
-
-	/* Ignore interrupt if there's nothing in NIC to service.
-	 * This may be due to IRQ shared with another device,
-	 * or due to sporadic interrupts thrown from our NIC. */
-	if (!priv->_agn.ict_tbl[priv->_agn.ict_index]) {
-		IWL_DEBUG_ISR(priv, "Ignore interrupt, inta == 0\n");
-		goto none;
-	}
-
-	/* read all entries that not 0 start with ict_index */
-	while (priv->_agn.ict_tbl[priv->_agn.ict_index]) {
-
-		val |= le32_to_cpu(priv->_agn.ict_tbl[priv->_agn.ict_index]);
-		IWL_DEBUG_ISR(priv, "ICT index %d value 0x%08X\n",
-				priv->_agn.ict_index,
-				le32_to_cpu(priv->_agn.ict_tbl[priv->_agn.ict_index]));
-		priv->_agn.ict_tbl[priv->_agn.ict_index] = 0;
-		priv->_agn.ict_index = iwl_queue_inc_wrap(priv->_agn.ict_index,
-						     ICT_COUNT);
-
-	}
-
-	/* We should not get this value, just ignore it. */
-	if (val == 0xffffffff)
-		val = 0;
-
-	/*
-	 * this is a w/a for a h/w bug. the h/w bug may cause the Rx bit
-	 * (bit 15 before shifting it to 31) to clear when using interrupt
-	 * coalescing. fortunately, bits 18 and 19 stay set when this happens
-	 * so we use them to decide on the real state of the Rx bit.
-	 * In order words, bit 15 is set if bit 18 or bit 19 are set.
-	 */
-	if (val & 0xC0000)
-		val |= 0x8000;
-
-	inta = (0xff & val) | ((0xff00 & val) << 16);
-	IWL_DEBUG_ISR(priv, "ISR inta 0x%08x, enabled 0x%08x ict 0x%08x\n",
-			inta, inta_mask, val);
-
-	inta &= priv->inta_mask;
-	priv->_agn.inta |= inta;
-
-	/* iwl_irq_tasklet() will service interrupts and re-enable them */
-	if (likely(inta))
-		tasklet_schedule(&priv->irq_tasklet);
-	else if (test_bit(STATUS_INT_ENABLED, &priv->status) && !priv->_agn.inta) {
-		/* Allow interrupt if was disabled by this handler and
-		 * no tasklet was schedules, We should not enable interrupt,
-		 * tasklet will enable it.
-		 */
-		iwl_enable_interrupts(priv);
-	}
-
-	spin_unlock_irqrestore(&priv->lock, flags);
-	return IRQ_HANDLED;
-
- none:
-	/* re-enable interrupts here since we don't have anything to service.
-	 * only Re-enable if disabled by irq.
-	 */
-	if (test_bit(STATUS_INT_ENABLED, &priv->status) && !priv->_agn.inta)
-		iwl_enable_interrupts(priv);
-
-	spin_unlock_irqrestore(&priv->lock, flags);
-	return IRQ_NONE;
-}
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 3de90c5..d50c68a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -1643,6 +1643,7 @@ int iwl_alive_start(struct iwl_priv *priv)
 	int ret = 0;
 	struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 
+	/*TODO: this should go to the transport layer */
 	iwl_reset_ict(priv);
 
 	IWL_DEBUG_INFO(priv, "Runtime Alive received.\n");
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.h b/drivers/net/wireless/iwlwifi/iwl-agn.h
index fa32eb9..c851fc2 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.h
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.h
@@ -113,10 +113,6 @@ extern struct iwl_mod_params iwlagn_mod_params;
 extern struct ieee80211_ops iwlagn_hw_ops;
 
 int iwl_reset_ict(struct iwl_priv *priv);
-void iwl_disable_ict(struct iwl_priv *priv);
-int iwl_alloc_isr_ict(struct iwl_priv *priv);
-void iwl_free_isr_ict(struct iwl_priv *priv);
-irqreturn_t iwl_isr_ict(int irq, void *data);
 
 static inline void iwl_set_calib_hdr(struct iwl_calib_hdr *hdr, u8 cmd)
 {
diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-int-pcie.h b/drivers/net/wireless/iwlwifi/iwl-trans-int-pcie.h
index 8307064..3015fac 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans-int-pcie.h
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-int-pcie.h
@@ -42,6 +42,16 @@ void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv,
 			struct iwl_rx_queue *q);
 
 /*****************************************************
+* ICT
+******************************************************/
+int iwl_reset_ict(struct iwl_priv *priv);
+void iwl_disable_ict(struct iwl_priv *priv);
+int iwl_alloc_isr_ict(struct iwl_priv *priv);
+void iwl_free_isr_ict(struct iwl_priv *priv);
+irqreturn_t iwl_isr_ict(int irq, void *data);
+
+
+/*****************************************************
 * TX / HCMD
 ******************************************************/
 void iwl_txq_update_write_ptr(struct iwl_priv *priv, struct iwl_tx_queue *txq);
diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-rx-pcie.c b/drivers/net/wireless/iwlwifi/iwl-trans-rx-pcie.c
index 046a33f..d5b9adf 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans-rx-pcie.c
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-rx-pcie.c
@@ -28,6 +28,7 @@
  *****************************************************************************/
 #include <linux/sched.h>
 #include <linux/wait.h>
+#include <linux/gfp.h>
 
 #include "iwl-dev.h"
 #include "iwl-agn.h"
@@ -692,3 +693,287 @@ void iwl_irq_tasklet(struct iwl_priv *priv)
 		iwl_enable_rfkill_int(priv);
 }
 
+/******************************************************************************
+ *
+ * ICT functions
+ *
+ ******************************************************************************/
+#define ICT_COUNT (PAGE_SIZE/sizeof(u32))
+
+/* Free dram table */
+void iwl_free_isr_ict(struct iwl_priv *priv)
+{
+	if (priv->_agn.ict_tbl_vir) {
+		dma_free_coherent(priv->bus.dev,
+				  (sizeof(u32) * ICT_COUNT) + PAGE_SIZE,
+				  priv->_agn.ict_tbl_vir,
+				  priv->_agn.ict_tbl_dma);
+		priv->_agn.ict_tbl_vir = NULL;
+		memset(&priv->_agn.ict_tbl_dma, 0,
+			sizeof(priv->_agn.ict_tbl_dma));
+		memset(&priv->_agn.aligned_ict_tbl_dma, 0,
+			sizeof(priv->_agn.aligned_ict_tbl_dma));
+	}
+}
+
+
+/* allocate dram shared table it is a PAGE_SIZE aligned
+ * also reset all data related to ICT table interrupt.
+ */
+int iwl_alloc_isr_ict(struct iwl_priv *priv)
+{
+
+	/* allocate shrared data table */
+	priv->_agn.ict_tbl_vir =
+		dma_alloc_coherent(priv->bus.dev,
+				   (sizeof(u32) * ICT_COUNT) + PAGE_SIZE,
+				   &priv->_agn.ict_tbl_dma, GFP_KERNEL);
+	if (!priv->_agn.ict_tbl_vir)
+		return -ENOMEM;
+
+	/* align table to PAGE_SIZE boundary */
+	priv->_agn.aligned_ict_tbl_dma =
+		ALIGN(priv->_agn.ict_tbl_dma, PAGE_SIZE);
+
+	IWL_DEBUG_ISR(priv, "ict dma addr %Lx dma aligned %Lx diff %d\n",
+			     (unsigned long long)priv->_agn.ict_tbl_dma,
+			     (unsigned long long)priv->_agn.aligned_ict_tbl_dma,
+			     (int)(priv->_agn.aligned_ict_tbl_dma -
+			     priv->_agn.ict_tbl_dma));
+
+	priv->_agn.ict_tbl =  priv->_agn.ict_tbl_vir +
+			  (priv->_agn.aligned_ict_tbl_dma -
+			  priv->_agn.ict_tbl_dma);
+
+	IWL_DEBUG_ISR(priv, "ict vir addr %p vir aligned %p diff %d\n",
+			     priv->_agn.ict_tbl, priv->_agn.ict_tbl_vir,
+			(int)(priv->_agn.aligned_ict_tbl_dma -
+			    priv->_agn.ict_tbl_dma));
+
+	/* reset table and index to all 0 */
+	memset(priv->_agn.ict_tbl_vir, 0,
+		(sizeof(u32) * ICT_COUNT) + PAGE_SIZE);
+	priv->_agn.ict_index = 0;
+
+	/* add periodic RX interrupt */
+	priv->inta_mask |= CSR_INT_BIT_RX_PERIODIC;
+	return 0;
+}
+
+/* Device is going up inform it about using ICT interrupt table,
+ * also we need to tell the driver to start using ICT interrupt.
+ */
+int iwl_reset_ict(struct iwl_priv *priv)
+{
+	u32 val;
+	unsigned long flags;
+
+	if (!priv->_agn.ict_tbl_vir)
+		return 0;
+
+	spin_lock_irqsave(&priv->lock, flags);
+	iwl_disable_interrupts(priv);
+
+	memset(&priv->_agn.ict_tbl[0], 0, sizeof(u32) * ICT_COUNT);
+
+	val = priv->_agn.aligned_ict_tbl_dma >> PAGE_SHIFT;
+
+	val |= CSR_DRAM_INT_TBL_ENABLE;
+	val |= CSR_DRAM_INIT_TBL_WRAP_CHECK;
+
+	IWL_DEBUG_ISR(priv, "CSR_DRAM_INT_TBL_REG =0x%X "
+			"aligned dma address %Lx\n",
+			val,
+			(unsigned long long)priv->_agn.aligned_ict_tbl_dma);
+
+	iwl_write32(priv, CSR_DRAM_INT_TBL_REG, val);
+	priv->_agn.use_ict = true;
+	priv->_agn.ict_index = 0;
+	iwl_write32(priv, CSR_INT, priv->inta_mask);
+	iwl_enable_interrupts(priv);
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return 0;
+}
+
+/* Device is going down disable ict interrupt usage */
+void iwl_disable_ict(struct iwl_priv *priv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->lock, flags);
+	priv->_agn.use_ict = false;
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static irqreturn_t iwl_isr(int irq, void *data)
+{
+	struct iwl_priv *priv = data;
+	u32 inta, inta_mask;
+	unsigned long flags;
+#ifdef CONFIG_IWLWIFI_DEBUG
+	u32 inta_fh;
+#endif
+	if (!priv)
+		return IRQ_NONE;
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	/* Disable (but don't clear!) interrupts here to avoid
+	 *    back-to-back ISRs and sporadic interrupts from our NIC.
+	 * If we have something to service, the tasklet will re-enable ints.
+	 * If we *don't* have something, we'll re-enable before leaving here. */
+	inta_mask = iwl_read32(priv, CSR_INT_MASK);  /* just for debug */
+	iwl_write32(priv, CSR_INT_MASK, 0x00000000);
+
+	/* Discover which interrupts are active/pending */
+	inta = iwl_read32(priv, CSR_INT);
+
+	/* Ignore interrupt if there's nothing in NIC to service.
+	 * This may be due to IRQ shared with another device,
+	 * or due to sporadic interrupts thrown from our NIC. */
+	if (!inta) {
+		IWL_DEBUG_ISR(priv, "Ignore interrupt, inta == 0\n");
+		goto none;
+	}
+
+	if ((inta == 0xFFFFFFFF) || ((inta & 0xFFFFFFF0) == 0xa5a5a5a0)) {
+		/* Hardware disappeared. It might have already raised
+		 * an interrupt */
+		IWL_WARN(priv, "HARDWARE GONE?? INTA == 0x%08x\n", inta);
+		goto unplugged;
+	}
+
+#ifdef CONFIG_IWLWIFI_DEBUG
+	if (iwl_get_debug_level(priv) & (IWL_DL_ISR)) {
+		inta_fh = iwl_read32(priv, CSR_FH_INT_STATUS);
+		IWL_DEBUG_ISR(priv, "ISR inta 0x%08x, enabled 0x%08x, "
+			      "fh 0x%08x\n", inta, inta_mask, inta_fh);
+	}
+#endif
+
+	priv->_agn.inta |= inta;
+	/* iwl_irq_tasklet() will service interrupts and re-enable them */
+	if (likely(inta))
+		tasklet_schedule(&priv->irq_tasklet);
+	else if (test_bit(STATUS_INT_ENABLED, &priv->status) &&
+			!priv->_agn.inta)
+		iwl_enable_interrupts(priv);
+
+ unplugged:
+	spin_unlock_irqrestore(&priv->lock, flags);
+	return IRQ_HANDLED;
+
+ none:
+	/* re-enable interrupts here since we don't have anything to service. */
+	/* only Re-enable if disabled by irq  and no schedules tasklet. */
+	if (test_bit(STATUS_INT_ENABLED, &priv->status) && !priv->_agn.inta)
+		iwl_enable_interrupts(priv);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+	return IRQ_NONE;
+}
+
+/* interrupt handler using ict table, with this interrupt driver will
+ * stop using INTA register to get device's interrupt, reading this register
+ * is expensive, device will write interrupts in ICT dram table, increment
+ * index then will fire interrupt to driver, driver will OR all ICT table
+ * entries from current index up to table entry with 0 value. the result is
+ * the interrupt we need to service, driver will set the entries back to 0 and
+ * set index.
+ */
+irqreturn_t iwl_isr_ict(int irq, void *data)
+{
+	struct iwl_priv *priv = data;
+	u32 inta, inta_mask;
+	u32 val = 0;
+	unsigned long flags;
+
+	if (!priv)
+		return IRQ_NONE;
+
+	/* dram interrupt table not set yet,
+	 * use legacy interrupt.
+	 */
+	if (!priv->_agn.use_ict)
+		return iwl_isr(irq, data);
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	/* Disable (but don't clear!) interrupts here to avoid
+	 * back-to-back ISRs and sporadic interrupts from our NIC.
+	 * If we have something to service, the tasklet will re-enable ints.
+	 * If we *don't* have something, we'll re-enable before leaving here.
+	 */
+	inta_mask = iwl_read32(priv, CSR_INT_MASK);  /* just for debug */
+	iwl_write32(priv, CSR_INT_MASK, 0x00000000);
+
+
+	/* Ignore interrupt if there's nothing in NIC to service.
+	 * This may be due to IRQ shared with another device,
+	 * or due to sporadic interrupts thrown from our NIC. */
+	if (!priv->_agn.ict_tbl[priv->_agn.ict_index]) {
+		IWL_DEBUG_ISR(priv, "Ignore interrupt, inta == 0\n");
+		goto none;
+	}
+
+	/* read all entries that not 0 start with ict_index */
+	while (priv->_agn.ict_tbl[priv->_agn.ict_index]) {
+
+		val |= le32_to_cpu(priv->_agn.ict_tbl[priv->_agn.ict_index]);
+		IWL_DEBUG_ISR(priv, "ICT index %d value 0x%08X\n",
+				priv->_agn.ict_index,
+				le32_to_cpu(
+				    priv->_agn.ict_tbl[priv->_agn.ict_index]));
+		priv->_agn.ict_tbl[priv->_agn.ict_index] = 0;
+		priv->_agn.ict_index = iwl_queue_inc_wrap(priv->_agn.ict_index,
+						     ICT_COUNT);
+
+	}
+
+	/* We should not get this value, just ignore it. */
+	if (val == 0xffffffff)
+		val = 0;
+
+	/*
+	 * this is a w/a for a h/w bug. the h/w bug may cause the Rx bit
+	 * (bit 15 before shifting it to 31) to clear when using interrupt
+	 * coalescing. fortunately, bits 18 and 19 stay set when this happens
+	 * so we use them to decide on the real state of the Rx bit.
+	 * In order words, bit 15 is set if bit 18 or bit 19 are set.
+	 */
+	if (val & 0xC0000)
+		val |= 0x8000;
+
+	inta = (0xff & val) | ((0xff00 & val) << 16);
+	IWL_DEBUG_ISR(priv, "ISR inta 0x%08x, enabled 0x%08x ict 0x%08x\n",
+			inta, inta_mask, val);
+
+	inta &= priv->inta_mask;
+	priv->_agn.inta |= inta;
+
+	/* iwl_irq_tasklet() will service interrupts and re-enable them */
+	if (likely(inta))
+		tasklet_schedule(&priv->irq_tasklet);
+	else if (test_bit(STATUS_INT_ENABLED, &priv->status) &&
+			!priv->_agn.inta) {
+		/* Allow interrupt if was disabled by this handler and
+		 * no tasklet was schedules, We should not enable interrupt,
+		 * tasklet will enable it.
+		 */
+		iwl_enable_interrupts(priv);
+	}
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+	return IRQ_HANDLED;
+
+ none:
+	/* re-enable interrupts here since we don't have anything to service.
+	 * only Re-enable if disabled by irq.
+	 */
+	if (test_bit(STATUS_INT_ENABLED, &priv->status) && !priv->_agn.inta)
+		iwl_enable_interrupts(priv);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+	return IRQ_NONE;
+}