iwlwifi: cleanup PCI register handling

This patch cleans up pci registers handling.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-4965-hw.h

@@ -98,16 +98,17 @@
 #define IWL_RSSI_OFFSET	44
 
 
-#include "iwl-commands.h"
 
 /* PCI registers */
-#define PCI_LINK_CTRL      0x0F0	/* 1 byte */
-#define PCI_POWER_SOURCE   0x0C8
-#define PCI_REG_WUM8       0x0E8
+#define PCI_CFG_RETRY_TIMEOUT	0x041
+#define PCI_CFG_POWER_SOURCE	0x0C8
+#define PCI_REG_WUM8		0x0E8
+#define PCI_CFG_LINK_CTRL	0x0F0
 
 /* PCI register values */
-#define PCI_LINK_VAL_L0S_EN	0x01
-#define PCI_LINK_VAL_L1_EN	0x02
+#define PCI_CFG_LINK_CTRL_VAL_L0S_EN	0x01
+#define PCI_CFG_LINK_CTRL_VAL_L1_EN	0x02
+#define PCI_CFG_CMD_REG_INT_DIS_MSK	0x04
 #define PCI_CFG_PMC_PME_FROM_D3COLD_SUPPORT         (0x80000000)
 
 #define TFD_QUEUE_SIZE_MAX      (256)

drivers/net/wireless/iwlwifi/iwl-4965.c

@@ -399,7 +399,7 @@ static void iwl4965_nic_config(struct iwl_priv *priv)
 	unsigned long flags;
 	u32 val;
 	u16 radio_cfg;
-	u8 val_link;
+	u16 link;
 
 	spin_lock_irqsave(&priv->lock, flags);
 
@@ -410,10 +410,10 @@ static void iwl4965_nic_config(struct iwl_priv *priv)
 				       val & ~(1 << 11));
 	}
 
-	pci_read_config_byte(priv->pci_dev, PCI_LINK_CTRL, &val_link);
+	pci_read_config_word(priv->pci_dev, PCI_CFG_LINK_CTRL, &link);
 
 	/* L1 is enabled by BIOS */
-	if ((val_link & PCI_LINK_VAL_L1_EN) == PCI_LINK_VAL_L1_EN)
+	if ((link & PCI_CFG_LINK_CTRL_VAL_L1_EN) == PCI_CFG_LINK_CTRL_VAL_L1_EN)
 		/* diable L0S disabled L1A enabled */
 		iwl_set_bit(priv, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED);
 	else

drivers/net/wireless/iwlwifi/iwl-5000.c

@@ -208,14 +208,14 @@ static void iwl5000_nic_config(struct iwl_priv *priv)
 {
 	unsigned long flags;
 	u16 radio_cfg;
-	u8 val_link;
+	u16 link;
 
 	spin_lock_irqsave(&priv->lock, flags);
 
-	pci_read_config_byte(priv->pci_dev, PCI_LINK_CTRL, &val_link);
+	pci_read_config_word(priv->pci_dev, PCI_CFG_LINK_CTRL, &link);
 
 	/* L1 is enabled by BIOS */
-	if ((val_link & PCI_LINK_VAL_L1_EN) == PCI_LINK_VAL_L1_EN)
+	if ((link & PCI_CFG_LINK_CTRL_VAL_L1_EN) == PCI_CFG_LINK_CTRL_VAL_L1_EN)
 		/* diable L0S disabled L1A enabled */
 		iwl_set_bit(priv, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED);
 	else

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -1273,7 +1273,7 @@ int iwl4965_set_pwr_src(struct iwl_priv *priv, enum iwl_pwr_src src)
 
 	if (src == IWL_PWR_SRC_VAUX) {
 		u32 val;
-		ret = pci_read_config_dword(priv->pci_dev, PCI_POWER_SOURCE,
+		ret = pci_read_config_dword(priv->pci_dev, PCI_CFG_POWER_SOURCE,
 					    &val);
 
 		if (val & PCI_CFG_PMC_PME_FROM_D3COLD_SUPPORT)
@@ -4229,9 +4229,6 @@ static int iwl4965_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 
 	pci_set_drvdata(pdev, priv);
 
-	/* We disable the RETRY_TIMEOUT register (0x41) to keep
-	 * PCI Tx retries from interfering with C3 CPU state */
-	pci_write_config_byte(pdev, 0x41, 0x00);
 
 	/***********************
 	 * 3. Read REV register
@@ -4251,6 +4248,10 @@ static int iwl4965_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 		": Detected Intel Wireless WiFi Link %s REV=0x%X\n",
 		priv->cfg->name, priv->hw_rev);
 
+	/* We disable the RETRY_TIMEOUT register (0x41) to keep
+	 * PCI Tx retries from interfering with C3 CPU state */
+	pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);
+
 	/* amp init */
 	err = priv->cfg->ops->lib->apm_ops.init(priv);
 	if (err < 0) {

drivers/net/wireless/iwlwifi/iwl-commands.h

@@ -2026,8 +2026,8 @@ struct iwl4965_spectrum_notification {
  *   bit 2 - '0' PM have to walk up every DTIM
  *           '1' PM could sleep over DTIM till listen Interval.
  * PCI power managed
- *   bit 3 - '0' (PCI_LINK_CTRL & 0x1)
- *           '1' !(PCI_LINK_CTRL & 0x1)
+ *   bit 3 - '0' (PCI_CFG_LINK_CTRL & 0x1)
+ *           '1' !(PCI_CFG_LINK_CTRL & 0x1)
  * Force sleep Modes
  *   bit 31/30- '00' use both mac/xtal sleeps
  *              '01' force Mac sleep

drivers/net/wireless/iwlwifi/iwl-power.c

@@ -152,9 +152,10 @@ static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
 /* initialize to default */
 static int iwl_power_init_handle(struct iwl_priv *priv)
 {
-	int ret = 0, i;
 	struct iwl_power_mgr *pow_data;
 	int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
+	struct iwl_powertable_cmd *cmd;
+	int i;
 	u16 pci_pm;
 
 	IWL_DEBUG_POWER("Initialize power \n");
@@ -167,25 +168,19 @@ static int iwl_power_init_handle(struct iwl_priv *priv)
 	memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
 	memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);
 
-	ret = pci_read_config_word(priv->pci_dev,
-				  PCI_LINK_CTRL, &pci_pm);
-	if (ret != 0)
-		return 0;
-	else {
-		struct iwl_powertable_cmd *cmd;
+	pci_read_config_word(priv->pci_dev, PCI_CFG_LINK_CTRL, &pci_pm);
 
-		IWL_DEBUG_POWER("adjust power command flags\n");
+	IWL_DEBUG_POWER("adjust power command flags\n");
 
-		for (i = 0; i < IWL_POWER_MAX; i++) {
-			cmd = &pow_data->pwr_range_0[i].cmd;
+	for (i = 0; i < IWL_POWER_MAX; i++) {
+		cmd = &pow_data->pwr_range_0[i].cmd;
 
-			if (pci_pm & 0x1)
-				cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
-			else
-				cmd->flags |= IWL_POWER_PCI_PM_MSK;
-		}
+		if (pci_pm & PCI_CFG_LINK_CTRL_VAL_L0S_EN)
+			cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
+		else
+			cmd->flags |= IWL_POWER_PCI_PM_MSK;
 	}
-	return ret;
+	return 0;
 }
 
 /* adjust power command according to dtim period and power level*/