iwlagn: semaphore and calib cleanup

All agn devices use the same eeprom semaphore and calib version routines.
Delete the indirection and move the semaphore routines to where they are
used and make static.

Signed-off-by: Don Fry <donald.h.fry@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

1 files changed, 41 insertions, 2 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-eeprom.c b/drivers/net/wireless/iwlwifi/iwl-eeprom.c
index 1e1a2d8df1d..c8397962632 100644
--- a/drivers/net/wireless/iwlwifi/iwl-eeprom.c
+++ b/drivers/net/wireless/iwlwifi/iwl-eeprom.c
@@ -142,6 +142,45 @@ static const u8 iwl_eeprom_band_7[] = {       /* 5.2 ht40 channel */
  *
 ******************************************************************************/
 
+/*
+ * The device's EEPROM semaphore prevents conflicts between driver and uCode
+ * when accessing the EEPROM; each access is a series of pulses to/from the
+ * EEPROM chip, not a single event, so even reads could conflict if they
+ * weren't arbitrated by the semaphore.
+ */
+static int iwl_eeprom_acquire_semaphore(struct iwl_priv *priv)
+{
+	u16 count;
+	int ret;
+
+	for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
+		/* Request semaphore */
+		iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
+			    CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
+
+		/* See if we got it */
+		ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
+				CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
+				CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
+				EEPROM_SEM_TIMEOUT);
+		if (ret >= 0) {
+			IWL_DEBUG_EEPROM(priv,
+				"Acquired semaphore after %d tries.\n",
+				count+1);
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
+static void iwl_eeprom_release_semaphore(struct iwl_priv *priv)
+{
+	iwl_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
+		CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
+
+}
+
 static int iwl_eeprom_verify_signature(struct iwl_priv *priv)
 {
 	u32 gp = iwl_read32(priv, CSR_EEPROM_GP) & CSR_EEPROM_GP_VALID_MSK;
@@ -421,7 +460,7 @@ int iwl_eeprom_init(struct iwl_priv *priv, u32 hw_rev)
 	}
 
 	/* Make sure driver (instead of uCode) is allowed to read EEPROM */
-	ret = priv->cfg->ops->lib->eeprom_ops.acquire_semaphore(priv);
+	ret = iwl_eeprom_acquire_semaphore(priv);
 	if (ret < 0) {
 		IWL_ERR(priv, "Failed to acquire EEPROM semaphore.\n");
 		ret = -ENOENT;
@@ -488,7 +527,7 @@ int iwl_eeprom_init(struct iwl_priv *priv, u32 hw_rev)
 
 	ret = 0;
 done:
-	priv->cfg->ops->lib->eeprom_ops.release_semaphore(priv);
+	iwl_eeprom_release_semaphore(priv);
 
 err:
 	if (ret)