iwlwifi: pcie: remove obsolete pre-release support code

We no longer need code that was introduced to differentiate
between two early versions of 8260.

We can remove this convoluted way to get the hardware version
that was needed because of a bug in the register's
configuration.

Moreover, since we no longer need to access the PRPH
registers, we no longer need to wake up the device,
request ownership, etc...
Remove all that.

This allows us to get the rid of the obsolete comment
about the AUX bus MISC address space which should have
been moved when this code was moved away from here.

Signed-off-by: Emmanuel Grumbach <[email protected]>
Signed-off-by: Luca Coelho <[email protected]>
Link: https://lore.kernel.org/r/iwlwifi.20201209231352.4a5665ccd8a6.Iff3879405c15758ba661c430e77dc2160ddada1c@changeid
Signed-off-by: Luca Coelho <[email protected]>

Author: egrumbach

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

@@ -406,10 +406,6 @@ enum {
 #define CNVR_SCU_SD_REGS_SD_REG_DIG_DCDC_VTRIM		0xA29890
 #define CNVR_SCU_SD_REGS_SD_REG_ACTIVE_VDIG_MIRROR	0xA29938
 
-enum {
-	HW_STEP_LOCATION_BITS = 24,
-};
-
 #define PREG_AUX_BUS_WPROT_0		0xA04CC0
 
 /* device family 9000 WPROT register */

drivers/net/wireless/intel/iwlwifi/pcie/drv.c

@@ -1006,7 +1006,6 @@ static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	const struct iwl_cfg *cfg_7265d __maybe_unused = NULL;
 	struct iwl_trans *iwl_trans;
 	struct iwl_trans_pcie *trans_pcie;
-	unsigned long flags;
 	int i, ret;
 	/*
 	 * This is needed for backwards compatibility with the old
@@ -1136,21 +1135,6 @@ static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		trans_pcie->num_rx_bufs = RX_QUEUE_SIZE;
 	}
 
-	if (iwl_trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_8000 &&
-	    iwl_trans_grab_nic_access(iwl_trans, &flags)) {
-		u32 hw_step;
-
-		hw_step = iwl_read_umac_prph_no_grab(iwl_trans, WFPM_CTRL_REG);
-		hw_step |= ENABLE_WFPM;
-		iwl_write_umac_prph_no_grab(iwl_trans, WFPM_CTRL_REG, hw_step);
-		hw_step = iwl_read_prph_no_grab(iwl_trans, CNVI_AUX_MISC_CHIP);
-		hw_step = (hw_step >> HW_STEP_LOCATION_BITS) & 0xF;
-		if (hw_step == 0x3)
-			iwl_trans->hw_rev = (iwl_trans->hw_rev & 0xFFFFFFF3) |
-				(SILICON_C_STEP << 2);
-		iwl_trans_release_nic_access(iwl_trans, &flags);
-	}
-
 	pci_set_drvdata(pdev, iwl_trans);
 	iwl_trans->drv = iwl_drv_start(iwl_trans);
 

drivers/net/wireless/intel/iwlwifi/pcie/trans.c

@@ -3536,26 +3536,10 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
 	 * "dash" value). To keep hw_rev backwards compatible - we'll store it
 	 * in the old format.
 	 */
-	if (cfg_trans->device_family >= IWL_DEVICE_FAMILY_8000) {
+	if (cfg_trans->device_family >= IWL_DEVICE_FAMILY_8000)
 		trans->hw_rev = (trans->hw_rev & 0xfff0) |
 				(CSR_HW_REV_STEP(trans->hw_rev << 2) << 2);
 
-		ret = iwl_pcie_prepare_card_hw(trans);
-		if (ret) {
-			IWL_WARN(trans, "Exit HW not ready\n");
-			goto out_no_pci;
-		}
-
-		/*
-		 * in-order to recognize C step driver should read chip version
-		 * id located at the AUX bus MISC address space.
-		 */
-		ret = iwl_finish_nic_init(trans, cfg_trans);
-		if (ret)
-			goto out_no_pci;
-
-	}
-
 	IWL_DEBUG_INFO(trans, "HW REV: 0x%0x\n", trans->hw_rev);
 
 	iwl_pcie_set_interrupt_capa(pdev, trans, cfg_trans);