iwlwifi: Add support for getting rf id with blank otp

When having a blank OTP the only way to get the rf id
and the cdb info is from prph registers.

Currently there is some implementation for this, but it
is located in the wrong place in the code (should be before
trying to understand what HW is connected and not after),
and it has a partial implementation.

Signed-off-by: Matti Gottlieb <matti.gottlieb@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210826224715.820c2ae18c2b.Iec9b2e2615ce65e6aff5ce896589227a7030f4cf@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

1 files changed, 96 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/drv.c b/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
index 3b974388d834..1a009bb047cd 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
@@ -1191,6 +1191,92 @@ static const struct iwl_dev_info iwl_dev_info_table[] = {
 #endif /* CONFIG_IWLMVM */
 };
 
+/*
+ * In case that there is no OTP on the NIC, get the rf id and cdb info
+ * from the prph registers.
+ */
+static int get_crf_id(struct iwl_trans *iwl_trans)
+{
+	int ret = 0;
+	u32 wfpm_ctrl_addr;
+	u32 wfpm_otp_cfg_addr;
+	u32 sd_reg_ver_addr;
+	u32 cdb = 0;
+	u32 val;
+
+	if (iwl_trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210) {
+		wfpm_ctrl_addr = WFPM_CTRL_REG_GEN2;
+		wfpm_otp_cfg_addr = WFPM_OTP_CFG1_ADDR_GEN2;
+		sd_reg_ver_addr = SD_REG_VER_GEN2;
+	/* Qu/Pu families have other addresses */
+	} else {
+		wfpm_ctrl_addr = WFPM_CTRL_REG;
+		wfpm_otp_cfg_addr = WFPM_OTP_CFG1_ADDR;
+		sd_reg_ver_addr = SD_REG_VER;
+	}
+
+	if (!iwl_trans_grab_nic_access(iwl_trans)) {
+		IWL_ERR(iwl_trans, "Failed to grab nic access before reading crf id\n");
+		ret = -EIO;
+		goto out;
+	}
+
+	/* Enable access to peripheral registers */
+	val = iwl_read_umac_prph_no_grab(iwl_trans, wfpm_ctrl_addr);
+	val |= ENABLE_WFPM;
+	iwl_write_umac_prph_no_grab(iwl_trans, wfpm_ctrl_addr, val);
+
+	/* Read crf info */
+	val = iwl_read_prph_no_grab(iwl_trans, sd_reg_ver_addr);
+
+	/* Read cdb info (also contains the jacket info if needed in the future */
+	cdb = iwl_read_umac_prph_no_grab(iwl_trans, wfpm_otp_cfg_addr);
+
+	/* Map between crf id to rf id */
+	switch (REG_CRF_ID_TYPE(val)) {
+	case REG_CRF_ID_TYPE_JF_1:
+		iwl_trans->hw_rf_id = (IWL_CFG_RF_TYPE_JF1 << 12);
+		break;
+	case REG_CRF_ID_TYPE_JF_2:
+		iwl_trans->hw_rf_id = (IWL_CFG_RF_TYPE_JF2 << 12);
+		break;
+	case REG_CRF_ID_TYPE_HR_NONE_CDB:
+		iwl_trans->hw_rf_id = (IWL_CFG_RF_TYPE_HR1 << 12);
+		break;
+	case REG_CRF_ID_TYPE_HR_CDB:
+		iwl_trans->hw_rf_id = (IWL_CFG_RF_TYPE_HR2 << 12);
+		break;
+	case REG_CRF_ID_TYPE_GF:
+		iwl_trans->hw_rf_id = (IWL_CFG_RF_TYPE_GF << 12);
+		break;
+	case REG_CRF_ID_TYPE_MR:
+		iwl_trans->hw_rf_id = (IWL_CFG_RF_TYPE_MR << 12);
+		break;
+	default:
+		ret = -EIO;
+		IWL_ERR(iwl_trans,
+			"Can find a correct rfid for crf id 0x%x\n",
+			REG_CRF_ID_TYPE(val));
+		goto out_release;
+
+	}
+
+	/* Set CDB capabilities */
+	if (cdb & BIT(4)) {
+		iwl_trans->hw_rf_id += BIT(28);
+		IWL_INFO(iwl_trans, "Adding cdb to rf id\n");
+	}
+
+	IWL_INFO(iwl_trans, "Detected RF 0x%x from crf id 0x%x\n",
+		 iwl_trans->hw_rf_id, REG_CRF_ID_TYPE(val));
+
+out_release:
+	iwl_trans_release_nic_access(iwl_trans);
+
+out:
+	return ret;
+}
+
 /* PCI registers */
 #define PCI_CFG_RETRY_TIMEOUT	0x041
 
@@ -1224,6 +1310,16 @@ static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	iwl_trans->hw_rf_id = iwl_read32(iwl_trans, CSR_HW_RF_ID);
 
+	/*
+	 * The RF_ID is set to zero in blank OTP so read version to
+	 * extract the RF_ID.
+	 * This is relevant only for family 9000 and up.
+	 */
+	if (iwl_trans->trans_cfg->rf_id &&
+	    iwl_trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_9000 &&
+	    !CSR_HW_RFID_TYPE(iwl_trans->hw_rf_id) && get_crf_id(iwl_trans))
+		goto out_free_trans;
+
 	for (i = 0; i < ARRAY_SIZE(iwl_dev_info_table); i++) {
 		const struct iwl_dev_info *dev_info = &iwl_dev_info_table[i];
 		if ((dev_info->device == (u16)IWL_CFG_ANY ||