iwlagn: co-exist with AMT
Enable using iwlwifi driver in AMT system.
Signed-off-by: Mohamed Abbas <mohamed.abbas@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 889574d..0a5507c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -1792,6 +1792,49 @@
iwl_cancel_deferred_work(priv);
}
+#define HW_READY_TIMEOUT (50)
+
+static int iwl_set_hw_ready(struct iwl_priv *priv)
+{
+ int ret = 0;
+
+ iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
+ CSR_HW_IF_CONFIG_REG_BIT_NIC_READY);
+
+ /* See if we got it */
+ ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
+ CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
+ CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
+ HW_READY_TIMEOUT);
+ if (ret != -ETIMEDOUT)
+ priv->hw_ready = true;
+ else
+ priv->hw_ready = false;
+
+ IWL_DEBUG_INFO(priv, "hardware %s\n",
+ (priv->hw_ready == 1) ? "ready" : "not ready");
+ return ret;
+}
+
+static int iwl_prepare_card_hw(struct iwl_priv *priv)
+{
+ int ret = 0;
+
+ IWL_DEBUG_INFO(priv, "iwl_prepare_card_hw enter \n");
+
+ iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
+ CSR_HW_IF_CONFIG_REG_PREPARE);
+
+ ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
+ ~CSR_HW_IF_CONFIG_REG_BIT_NIC_PREPARE_DONE,
+ CSR_HW_IF_CONFIG_REG_BIT_NIC_PREPARE_DONE, 150000);
+
+ if (ret != -ETIMEDOUT)
+ iwl_set_hw_ready(priv);
+
+ return ret;
+}
+
#define MAX_HW_RESTARTS 5
static int __iwl_up(struct iwl_priv *priv)
@@ -1809,6 +1852,13 @@
return -EIO;
}
+ iwl_prepare_card_hw(priv);
+
+ if (!priv->hw_ready) {
+ IWL_WARN(priv, "Exit HW not ready\n");
+ return -EIO;
+ }
+
/* If platform's RF_KILL switch is NOT set to KILL */
if (iwl_read32(priv, CSR_GP_CNTRL) & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW)
clear_bit(STATUS_RF_KILL_HW, &priv->status);
@@ -2896,6 +2946,12 @@
* PCI Tx retries from interfering with C3 CPU state */
pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);
+ iwl_prepare_card_hw(priv);
+ if (!priv->hw_ready) {
+ IWL_WARN(priv, "Failed, HW not ready\n");
+ goto out_iounmap;
+ }
+
/* amp init */
err = priv->cfg->ops->lib->apm_ops.init(priv);
if (err < 0) {