iwlwifi: do not reload fw if WiMAX own the RF

For WiFi/WiMAX combo devices, if WiMAX own the RF, WiFi driver
try to access RF and fail. This is the W/A to To avoid WiFi keep
reloading firmware and try to access RF again.

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

5 files changed, 25 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-5000.c b/drivers/net/wireless/iwlwifi/iwl-5000.c
index 8435e5a4e69d..34af9e0cfa43 100644
--- a/drivers/net/wireless/iwlwifi/iwl-5000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-5000.c
@@ -593,6 +593,7 @@ struct iwl_cfg iwl5350_agn_cfg = {
         .base_params = &iwl5000_base_params,
         .ht_params = &iwl5000_ht_params,
         .led_mode = IWL_LED_BLINK,
+        .internal_wimax_coex = true,
 };
 
 struct iwl_cfg iwl5150_agn_cfg = {
@@ -608,6 +609,7 @@ struct iwl_cfg iwl5150_agn_cfg = {
         .ht_params = &iwl5000_ht_params,
         .need_dc_calib = true,
         .led_mode = IWL_LED_BLINK,
+        .internal_wimax_coex = true,
 };
 
 struct iwl_cfg iwl5150_abg_cfg = {
@@ -622,6 +624,7 @@ struct iwl_cfg iwl5150_abg_cfg = {
         .base_params = &iwl5000_base_params,
         .need_dc_calib = true,
         .led_mode = IWL_LED_BLINK,
+        .internal_wimax_coex = true,
 };
 
 MODULE_FIRMWARE(IWL5000_MODULE_FIRMWARE(IWL5000_UCODE_API_MAX));
diff --git a/drivers/net/wireless/iwlwifi/iwl-6000.c b/drivers/net/wireless/iwlwifi/iwl-6000.c
index 8a789241704f..fe5f6d0a6539 100644
--- a/drivers/net/wireless/iwlwifi/iwl-6000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-6000.c
@@ -782,6 +782,7 @@ struct iwl_cfg iwl6050_2agn_cfg = {
         .ht_params = &iwl6000_ht_params,
         .need_dc_calib = true,
         .led_mode = IWL_LED_BLINK,
+        .internal_wimax_coex = true,
 };
 
 struct iwl_cfg iwl6150_bgn_cfg = {
@@ -797,6 +798,7 @@ struct iwl_cfg iwl6150_bgn_cfg = {
         .ht_params = &iwl6000_ht_params,
         .need_dc_calib = true,
         .led_mode = IWL_LED_RF_STATE,
+        .internal_wimax_coex = true,
 };
 
 struct iwl_cfg iwl6050_2abg_cfg = {
@@ -811,6 +813,7 @@ struct iwl_cfg iwl6050_2abg_cfg = {
         .base_params = &iwl6050_base_params,
         .need_dc_calib = true,
         .led_mode = IWL_LED_BLINK,
+        .internal_wimax_coex = true,
 };
 
 struct iwl_cfg iwl6000_3agn_cfg = {
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index d62b92518417..06cdc60ff87f 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -957,6 +957,22 @@ void iwl_irq_handle_error(struct iwl_priv *priv)
         /* Cancel currently queued command. */
         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 
+        /* W/A for WiFi/WiMAX coex and WiMAX own the RF */
+        if (priv->cfg->internal_wimax_coex &&
+            (!(iwl_read_prph(priv, APMG_CLK_CTRL_REG) &
+                        APMS_CLK_VAL_MRB_FUNC_MODE) ||
+             (iwl_read_prph(priv, APMG_PS_CTRL_REG) &
+                        APMG_PS_CTRL_VAL_RESET_REQ))) {
+                wake_up_interruptible(&priv->wait_command_queue);
+                /*
+                 *Keep the restart process from trying to send host
+                 * commands by clearing the INIT status bit
+                 */
+                clear_bit(STATUS_READY, &priv->status);
+                IWL_ERR(priv, "RF is used by WiMAX\n");
+                return;
+        }
+
         IWL_ERR(priv, "Loaded firmware version: %s\n",
                 priv->hw->wiphy->fw_version);
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h
index d0b86f5e28c2..f80685ad2674 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.h
+++ b/drivers/net/wireless/iwlwifi/iwl-core.h
@@ -365,6 +365,7 @@ struct iwl_ht_params {
  * @led_mode: 0=blinking, 1=On(RF On)/Off(RF Off)
  * @adv_pm: advance power management
  * @rx_with_siso_diversity: 1x1 device with rx antenna diversity
+ * @internal_wimax_coex: internal wifi/wimax combo device
  *
  * We enable the driver to be backward compatible wrt API version. The
  * driver specifies which APIs it supports (with @ucode_api_max being the
@@ -414,6 +415,7 @@ struct iwl_cfg {
         enum iwl_led_mode led_mode;
         const bool adv_pm;
         const bool rx_with_siso_diversity;
+        const bool internal_wimax_coex;
 };
 
 /***************************
diff --git a/drivers/net/wireless/iwlwifi/iwl-prph.h b/drivers/net/wireless/iwlwifi/iwl-prph.h
index 5469655646ae..86f5123bccda 100644
--- a/drivers/net/wireless/iwlwifi/iwl-prph.h
+++ b/drivers/net/wireless/iwlwifi/iwl-prph.h
@@ -83,10 +83,10 @@
 #define APMG_DIGITAL_SVR_REG            (APMG_BASE + 0x0058)
 #define APMG_ANALOG_SVR_REG             (APMG_BASE + 0x006C)
 
+#define APMS_CLK_VAL_MRB_FUNC_MODE      (0x00000001)
 #define APMG_CLK_VAL_DMA_CLK_RQT        (0x00000200)
 #define APMG_CLK_VAL_BSM_CLK_RQT        (0x00000800)
 
-
 #define APMG_PS_CTRL_EARLY_PWR_OFF_RESET_DIS    (0x00400000)
 #define APMG_PS_CTRL_VAL_RESET_REQ              (0x04000000)
 #define APMG_PS_CTRL_MSK_PWR_SRC                (0x03000000)