1 // SPDX-License-Identifier: GPL-2.0
11  * igc_disable_pcie_master - Disables PCI-express master access
14  * Returns 0 (0) if successful, else returns -10
15  * (-IGC_ERR_MASTER_REQUESTS_PENDING) if master disable bit has not caused
18  * Disables PCI-Express master access and verifies there are no pending
36 		timeout--;  in igc_disable_pcie_master()
41 		ret_val = -IGC_ERR_MASTER_REQUESTS_PENDING;  in igc_disable_pcie_master()
50  * igc_init_rx_addrs - Initialize receive addresses
52  * @rar_count: receive address registers
54  * Setup the receive address registers by setting the base receive address
55  * register to the devices MAC address and clearing all the other receive
56  * address registers to 0.
63 	/* Setup the receive address */  in igc_init_rx_addrs()
64 	hw_dbg("Programming MAC Address into RAR[0]\n");  in igc_init_rx_addrs()
66 	hw->mac.ops.rar_set(hw, hw->mac.addr, 0);  in igc_init_rx_addrs()
68 	/* Zero out the other (rar_entry_count - 1) receive addresses */  in igc_init_rx_addrs()
69 	hw_dbg("Clearing RAR[1-%u]\n", rar_count - 1);  in igc_init_rx_addrs()
71 		hw->mac.ops.rar_set(hw, mac_addr, i);  in igc_init_rx_addrs()
75  * igc_set_fc_watermarks - Set flow control high/low watermarks
92 	if (hw->fc.current_mode & igc_fc_tx_pause) {  in igc_set_fc_watermarks()
97 		fcrtl = hw->fc.low_water;  in igc_set_fc_watermarks()
98 		if (hw->fc.send_xon)  in igc_set_fc_watermarks()
101 		fcrth = hw->fc.high_water;  in igc_set_fc_watermarks()
110  * igc_setup_link - Setup flow control and link settings
114  * control.  Calls the appropriate media-specific link configuration
132 	if (hw->fc.requested_mode == igc_fc_default)  in igc_setup_link()
133 		hw->fc.requested_mode = igc_fc_full;  in igc_setup_link()
139 	hw->fc.current_mode = hw->fc.requested_mode;  in igc_setup_link()
141 	hw_dbg("After fix-ups FlowControl is now = %x\n", hw->fc.current_mode);  in igc_setup_link()
144 	ret_val = hw->mac.ops.setup_physical_interface(hw);  in igc_setup_link()
148 	/* Initialize the flow control address, type, and PAUSE timer  in igc_setup_link()
153 	hw_dbg("Initializing the Flow Control address, type and timer regs\n");  in igc_setup_link()
158 	wr32(IGC_FCTTV, hw->fc.pause_time);  in igc_setup_link()
167  * igc_force_mac_fc - Force the MAC's flow control settings
170  * Force the MAC's flow control settings.  Sets the TFCE and RFCE bits in the
173  * autonegotiation is managed by the PHY rather than the MAC.  Software must
183 	/* Because we didn't get link via the internal auto-negotiation  in igc_force_mac_fc()
185 	 * auto-neg), we have to manually enable/disable transmit an  in igc_force_mac_fc()
189 	 * according to the "hw->fc.current_mode" parameter.  in igc_force_mac_fc()
200 	hw_dbg("hw->fc.current_mode = %u\n", hw->fc.current_mode);  in igc_force_mac_fc()
202 	switch (hw->fc.current_mode) {  in igc_force_mac_fc()
219 		ret_val = -IGC_ERR_CONFIG;  in igc_force_mac_fc()
230  * igc_clear_hw_cntrs_base - Clear base hardware counters
312  * igc_rar_set - Set receive address register
314  * @addr: pointer to the receive address
315  * @index: receive address array register
317  * Sets the receive address array register at index to the address passed
333 	/* If MAC address zero, no need to set the AV bit */  in igc_rar_set()
337 	/* Some bridges will combine consecutive 32-bit writes into  in igc_rar_set()
348  * igc_check_for_copper_link - Check for link (Copper)
357 	struct igc_mac_info *mac = &hw->mac;  in igc_check_for_copper_link()  local
361 	/* We only want to go out to the PHY registers to see if Auto-Neg  in igc_check_for_copper_link()
366 	if (!mac->get_link_status) {  in igc_check_for_copper_link()
382 	mac->get_link_status = false;  in igc_check_for_copper_link()
385 	 * immediately after link-up  in igc_check_for_copper_link()
392 	if (!mac->autoneg) {  in igc_check_for_copper_link()
393 		ret_val = -IGC_ERR_CONFIG;  in igc_check_for_copper_link()
397 	/* Auto-Neg is enabled.  Auto Speed Detection takes care  in igc_check_for_copper_link()
398 	 * of MAC speed/duplex configuration.  So we only need to  in igc_check_for_copper_link()
399 	 * configure Collision Distance in the MAC.  in igc_check_for_copper_link()
403 	/* Configure Flow Control now that Auto-Neg has completed.  in igc_check_for_copper_link()
405 	 * settings because we may have had to re-autoneg with a  in igc_check_for_copper_link()
422  * igc_config_collision_dist - Configure collision distance
443  * igc_config_fc_after_link_up - Configures flow control after link
446  * Checks the status of auto-negotiation after link up to ensure that the
448  * flow control needs to be forced also.  If auto-negotiation is enabled
455 	struct igc_mac_info *mac = &hw->mac;  in igc_config_fc_after_link_up()  local
459 	/* Check for the case where we have fiber media and auto-neg failed  in igc_config_fc_after_link_up()
461 	 * configuration of the MAC to match the "fc" parameter.  in igc_config_fc_after_link_up()
463 	if (mac->autoneg_failed)  in igc_config_fc_after_link_up()
471 	/* Check for the case where we have copper media and auto-neg is  in igc_config_fc_after_link_up()
472 	 * enabled.  In this case, we need to check and see if Auto-Neg  in igc_config_fc_after_link_up()
476 	if (mac->autoneg) {  in igc_config_fc_after_link_up()
481 		ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS,  in igc_config_fc_after_link_up()
485 		ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS,  in igc_config_fc_after_link_up()
497 		 * Register (Address 4) and the Auto_Negotiation Base  in igc_config_fc_after_link_up()
498 		 * Page Ability Register (Address 5) to determine how  in igc_config_fc_after_link_up()
501 		ret_val = hw->phy.ops.read_reg(hw, PHY_AUTONEG_ADV,  in igc_config_fc_after_link_up()
505 		ret_val = hw->phy.ops.read_reg(hw, PHY_LP_ABILITY,  in igc_config_fc_after_link_up()
510 		 * (Address 4) and two bits in the Auto Negotiation Base  in igc_config_fc_after_link_up()
511 		 * Page Ability Register (Address 5) determine flow control  in igc_config_fc_after_link_up()
520 		 *-------|---------|-------|---------|--------------------  in igc_config_fc_after_link_up()
538 		 *-------|---------|-------|---------|--------------------  in igc_config_fc_after_link_up()
550 			if (hw->fc.requested_mode == igc_fc_full) {  in igc_config_fc_after_link_up()
551 				hw->fc.current_mode = igc_fc_full;  in igc_config_fc_after_link_up()
554 				hw->fc.current_mode = igc_fc_rx_pause;  in igc_config_fc_after_link_up()
563 		 *-------|---------|-------|---------|--------------------  in igc_config_fc_after_link_up()
570 			hw->fc.current_mode = igc_fc_tx_pause;  in igc_config_fc_after_link_up()
577 		 *-------|---------|-------|---------|--------------------  in igc_config_fc_after_link_up()
584 			hw->fc.current_mode = igc_fc_rx_pause;  in igc_config_fc_after_link_up()
607 		else if ((hw->fc.requested_mode == igc_fc_none) ||  in igc_config_fc_after_link_up()
608 			 (hw->fc.requested_mode == igc_fc_tx_pause) ||  in igc_config_fc_after_link_up()
609 			 (hw->fc.strict_ieee)) {  in igc_config_fc_after_link_up()
610 			hw->fc.current_mode = igc_fc_none;  in igc_config_fc_after_link_up()
613 			hw->fc.current_mode = igc_fc_rx_pause;  in igc_config_fc_after_link_up()
617 		/* Now we need to do one last check...  If we auto-  in igc_config_fc_after_link_up()
621 		ret_val = hw->mac.ops.get_speed_and_duplex(hw, &speed, &duplex);  in igc_config_fc_after_link_up()
628 			hw->fc.current_mode = igc_fc_none;  in igc_config_fc_after_link_up()
630 		/* Now we call a subroutine to actually force the MAC  in igc_config_fc_after_link_up()
645  * igc_get_auto_rd_done - Check for auto read completion
664 		ret_val = -IGC_ERR_RESET;  in igc_get_auto_rd_done()
673  * igc_get_speed_and_duplex_copper - Retrieve current speed/duplex
692 		if (hw->mac.type == igc_i225 &&  in igc_get_speed_and_duplex_copper()
720  * igc_put_hw_semaphore - Release hardware semaphore
737  * igc_enable_mng_pass_thru - Enable processing of ARP's
749 	if (!hw->mac.asf_firmware_present)  in igc_enable_mng_pass_thru()
757 	if (hw->mac.arc_subsystem_valid) {  in igc_enable_mng_pass_thru()
780  *  igc_hash_mc_addr - Generate a multicast hash value
782  *  @mc_addr: pointer to a multicast address
784  *  Generates a multicast address hash value which is used to determine
785  *  the multicast filter table array address and new table value.  See
794 	hash_mask = (hw->mac.mta_reg_count * 32) - 1;  in igc_hash_mc_addr()
796 	/* For a mc_filter_type of 0, bit_shift is the number of left-shifts  in igc_hash_mc_addr()
802 	/* The portion of the address that is used for the hash table  in igc_hash_mc_addr()
806 	 * left-shifts where the MSB of mc_addr[5] would still fall within  in igc_hash_mc_addr()
809 	 * remaining number of bits. Thus 8 - bit_shift.  The rest of the  in igc_hash_mc_addr()
812 	 * 8-bit shifting total.  in igc_hash_mc_addr()
814 	 * For example, given the following Destination MAC Address and an  in igc_hash_mc_addr()
815 	 * MTA register count of 128 (thus a 4096-bit vector and 0xFFF mask),  in igc_hash_mc_addr()
827 	switch (hw->mac.mc_filter_type) {  in igc_hash_mc_addr()
842 	hash_value = hash_mask & (((mc_addr[4] >> (8 - bit_shift)) |  in igc_hash_mc_addr()
849  *  igc_update_mc_addr_list - Update Multicast addresses
864 	memset(&hw->mac.mta_shadow, 0, sizeof(hw->mac.mta_shadow));  in igc_update_mc_addr_list()
870 		hash_reg = (hash_value >> 5) & (hw->mac.mta_reg_count - 1);  in igc_update_mc_addr_list()
873 		hw->mac.mta_shadow[hash_reg] |= BIT(hash_bit);  in igc_update_mc_addr_list()
878 	for (i = hw->mac.mta_reg_count - 1; i >= 0; i--)  in igc_update_mc_addr_list()
879 		array_wr32(IGC_MTA, i, hw->mac.mta_shadow[i]);  in igc_update_mc_addr_list()