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 <[email protected]>
Signed-off-by: Luca Coelho <[email protected]>
Link: https://lore.kernel.org/r/iwlwifi.20210826224715.820c2ae18c2b.Iec9b2e2615ce65e6aff5ce896589227a7030f4cf@changeid
Signed-off-by: Luca Coelho <[email protected]>

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

@@ -2077,7 +2077,7 @@ static u32 iwl_dump_ini_info(struct iwl_fw_runtime *fwrt,
 	 */
 	hw_type = CSR_HW_REV_TYPE(fwrt->trans->hw_rev);
 	if (hw_type == IWL_AX210_HW_TYPE) {
-		u32 prph_val = iwl_read_prph(fwrt->trans, WFPM_OTP_CFG1_ADDR);
+		u32 prph_val = iwl_read_prph(fwrt->trans, WFPM_OTP_CFG1_ADDR_GEN2);
 		u32 is_jacket = !!(prph_val & WFPM_OTP_CFG1_IS_JACKET_BIT);
 		u32 is_cdb = !!(prph_val & WFPM_OTP_CFG1_IS_CDB_BIT);
 		u32 masked_bits = is_jacket | (is_cdb << 1);

drivers/net/wireless/intel/iwlwifi/fw/error-dump.h

@@ -342,10 +342,6 @@ struct iwl_fw_ini_dump_cfg_name {
 #define IWL_AX210_HW_TYPE 0x42
 /* How many bits to roll when adding to the HW type of AX210 HW */
 #define IWL_AX210_HW_TYPE_ADDITION_SHIFT 12
-/* This prph is used to tell apart HW_TYPE == 0x42 NICs */
-#define WFPM_OTP_CFG1_ADDR 0xd03098
-#define WFPM_OTP_CFG1_IS_JACKET_BIT BIT(4)
-#define WFPM_OTP_CFG1_IS_CDB_BIT BIT(5)
 
 /* struct iwl_fw_ini_dump_info - ini dump information
  * @version: dump version

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

@@ -347,6 +347,12 @@
 #define RADIO_REG_SYS_MANUAL_DFT_0	0xAD4078
 #define RFIC_REG_RD			0xAD0470
 #define WFPM_CTRL_REG			0xA03030
+#define WFPM_CTRL_REG_GEN2		0xd03030
+#define WFPM_OTP_CFG1_ADDR		0x00a03098
+#define WFPM_OTP_CFG1_ADDR_GEN2		0x00d03098
+#define WFPM_OTP_CFG1_IS_JACKET_BIT	BIT(4)
+#define WFPM_OTP_CFG1_IS_CDB_BIT	BIT(5)
+
 #define WFPM_GP2			0xA030B4
 
 /* DBGI SRAM Register details */
@@ -399,10 +405,39 @@ enum {
 	LMPM_PAGE_PASS_NOTIF_POS = BIT(20),
 };
 
+/*
+ * CRF ID register
+ *
+ * type: bits 0-11
+ * reserved: bits 12-18
+ * slave_exist: bit 19
+ * dash: bits 20-23
+ * step: bits 24-26
+ * flavor: bits 27-31
+ */
+#define REG_CRF_ID_TYPE(val)		(((val) & 0x00000FFF) >> 0)
+#define REG_CRF_ID_SLAVE(val)		(((val) & 0x00080000) >> 19)
+#define REG_CRF_ID_DASH(val)		(((val) & 0x00F00000) >> 20)
+#define REG_CRF_ID_STEP(val)		(((val) & 0x07000000) >> 24)
+#define REG_CRF_ID_FLAVOR(val)		(((val) & 0xF8000000) >> 27)
+
 #define UREG_CHICK		(0xA05C00)
 #define UREG_CHICK_MSI_ENABLE	BIT(24)
 #define UREG_CHICK_MSIX_ENABLE	BIT(25)
 
+#define SD_REG_VER		0xa29600
+#define SD_REG_VER_GEN2		0x00a2b800
+
+#define REG_CRF_ID_TYPE_JF_1			0x201
+#define REG_CRF_ID_TYPE_JF_2			0x202
+#define REG_CRF_ID_TYPE_HR_CDB			0x503
+#define REG_CRF_ID_TYPE_HR_NONE_CDB		0x504
+#define REG_CRF_ID_TYPE_HR_NONE_CDB_1X1	0x501
+#define REG_CRF_ID_TYPE_HR_NONE_CDB_CCP	0x532
+#define REG_CRF_ID_TYPE_GF			0x410
+#define REG_CRF_ID_TYPE_GF_TC			0xF08
+#define REG_CRF_ID_TYPE_MR			0x810
+
 #define HPM_DEBUG			0xA03440
 #define PERSISTENCE_BIT			BIT(12)
 #define PREG_WFPM_ACCESS		BIT(12)

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 ||