iwlwifi: mvm: ring the doorbell and wait for PNVM load completion

When we receive a non-zero SKU_ID in the alive notification, we need
to ring the doorbell and wait for the FW to send us a PNVM load
complete notification before we continue the init phase.
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/iwlwifi.20201008180656.a10e8b6bbcf9.Ib5d10b3d508a4d2d4e6b7b629af89d76f4f03d81@changeid

drivers/net/wireless/intel/iwlwifi/fw/api/nvm-reg.h

@@ -90,6 +90,11 @@ enum iwl_regulatory_and_nvm_subcmd_ids {
 	 * @TAS_CONFIG: &struct iwl_tas_config_cmd
 	 */
 	TAS_CONFIG = 0x3,
+
+	/**
+	 * @PNVM_INIT_COMPLETE_NTFY: &struct iwl_pnvm_init_complete_ntfy
+	 */
+	PNVM_INIT_COMPLETE_NTFY = 0xFE,
 };
 
 /**
@@ -476,4 +481,12 @@ struct iwl_lari_config_change_cmd {
 	__le32 config_bitmap;
 } __packed; /* LARI_CHANGE_CONF_CMD_S_VER_1 */
 
+/**
+ * struct iwl_pnvm_init_complete_ntfy - PNVM initialization complete
+ * @status: PNVM image loading status
+ */
+struct iwl_pnvm_init_complete_ntfy {
+	__le32 status;
+} __packed; /* PNVM_INIT_COMPLETE_NTFY_S_VER_1 */
+
 #endif /* __iwl_fw_api_nvm_reg_h__ */

drivers/net/wireless/intel/iwlwifi/iwl-prph.h

@@ -460,6 +460,7 @@ enum {
 #define UREG_DOORBELL_TO_ISR6_NMI_BIT	BIT(0)
 #define UREG_DOORBELL_TO_ISR6_SUSPEND	BIT(18)
 #define UREG_DOORBELL_TO_ISR6_RESUME	BIT(19)
+#define UREG_DOORBELL_TO_ISR6_PNVM	BIT(20)
 
 #define FSEQ_ERROR_CODE			0xA340C8
 #define FSEQ_TOP_INIT_VERSION		0xA34038

drivers/net/wireless/intel/iwlwifi/mvm/fw.c

@@ -79,6 +79,7 @@
 
 #define MVM_UCODE_ALIVE_TIMEOUT	HZ
 #define MVM_UCODE_CALIB_TIMEOUT	(2*HZ)
+#define MVM_UCODE_PNVM_TIMEOUT	(HZ / 10)
 
 #define UCODE_VALID_OK	cpu_to_le32(0x1)
 
@@ -305,6 +306,20 @@ static bool iwl_alive_fn(struct iwl_notif_wait_data *notif_wait,
 	return true;
 }
 
+static bool iwl_pnvm_complete_fn(struct iwl_notif_wait_data *notif_wait,
+				 struct iwl_rx_packet *pkt, void *data)
+{
+	struct iwl_mvm *mvm =
+		container_of(notif_wait, struct iwl_mvm, notif_wait);
+	struct iwl_pnvm_init_complete_ntfy *pnvm_ntf = (void *)pkt->data;
+
+	IWL_DEBUG_FW(mvm,
+		     "PNVM complete notification received with status %d\n",
+		     le32_to_cpu(pnvm_ntf->status));
+
+	return true;
+}
+
 static bool iwl_wait_init_complete(struct iwl_notif_wait_data *notif_wait,
 				   struct iwl_rx_packet *pkt, void *data)
 {
@@ -328,6 +343,35 @@ static bool iwl_wait_phy_db_entry(struct iwl_notif_wait_data *notif_wait,
 	return false;
 }
 
+static int iwl_mvm_load_pnvm(struct iwl_mvm *mvm)
+{
+	struct iwl_notification_wait pnvm_wait;
+	static const u16 ntf_cmds[] = { WIDE_ID(REGULATORY_AND_NVM_GROUP,
+						PNVM_INIT_COMPLETE_NTFY) };
+
+	/* if the SKU_ID is empty, there's nothing to do */
+	if (!mvm->trans->sku_id[0] &&
+	    !mvm->trans->sku_id[1] &&
+	    !mvm->trans->sku_id[2])
+		return 0;
+
+	/*
+	 * TODO: phase 2: load the pnvm file, find the right section,
+	 * load it and set the right DMA pointer.
+	 */
+
+	iwl_init_notification_wait(&mvm->notif_wait, &pnvm_wait,
+				   ntf_cmds, ARRAY_SIZE(ntf_cmds),
+				   iwl_pnvm_complete_fn, NULL);
+
+	/* kick the doorbell */
+	iwl_write_umac_prph(mvm->trans, UREG_DOORBELL_TO_ISR6,
+			    UREG_DOORBELL_TO_ISR6_PNVM);
+
+	return iwl_wait_notification(&mvm->notif_wait, &pnvm_wait,
+				     MVM_UCODE_PNVM_TIMEOUT);
+}
+
 static int iwl_mvm_load_ucode_wait_alive(struct iwl_mvm *mvm,
 					 enum iwl_ucode_type ucode_type)
 {
@@ -416,6 +460,13 @@ static int iwl_mvm_load_ucode_wait_alive(struct iwl_mvm *mvm,
 		return -EIO;
 	}
 
+	ret = iwl_mvm_load_pnvm(mvm);
+	if (ret) {
+		IWL_ERR(mvm, "Timeout waiting for PNVM load!\n");
+		iwl_fw_set_current_image(&mvm->fwrt, old_type);
+		return ret;
+	}
+
 	iwl_trans_fw_alive(mvm->trans, alive_data.scd_base_addr);
 
 	/*