1 /***********************license start*************** 2 * Author: Cavium Networks 3 * 4 * Contact: support@caviumnetworks.com 5 * This file is part of the OCTEON SDK 6 * 7 * Copyright (c) 2003-2008 Cavium Networks 8 * 9 * This file is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License, Version 2, as 11 * published by the Free Software Foundation. 12 * 13 * This file is distributed in the hope that it will be useful, but 14 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty 15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or 16 * NONINFRINGEMENT. See the GNU General Public License for more 17 * details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this file; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 22 * or visit http://www.gnu.org/licenses/. 23 * 24 * This file may also be available under a different license from Cavium. 25 * Contact Cavium Networks for more information 26 ***********************license end**************************************/ 27 28 /* 29 * Functions for LOOP initialization, configuration, 30 * and monitoring. 31 */ 32 #include <asm/octeon/octeon.h> 33 34 #include <asm/octeon/cvmx-config.h> 35 36 #include <asm/octeon/cvmx-helper.h> 37 #include <asm/octeon/cvmx-pip-defs.h> 38 39 /** 40 * Probe a LOOP interface and determine the number of ports 41 * connected to it. The LOOP interface should still be down 42 * after this call. 43 * 44 * @interface: Interface to probe 45 * 46 * Returns Number of ports on the interface. Zero to disable. 47 */ 48 int __cvmx_helper_loop_probe(int interface) 49 { 50 union cvmx_ipd_sub_port_fcs ipd_sub_port_fcs; 51 int num_ports = 4; 52 int port; 53 54 /* We need to disable length checking so packet < 64 bytes and jumbo 55 frames don't get errors */ 56 for (port = 0; port < num_ports; port++) { 57 union cvmx_pip_prt_cfgx port_cfg; 58 int ipd_port = cvmx_helper_get_ipd_port(interface, port); 59 port_cfg.u64 = cvmx_read_csr(CVMX_PIP_PRT_CFGX(ipd_port)); 60 port_cfg.s.maxerr_en = 0; 61 port_cfg.s.minerr_en = 0; 62 cvmx_write_csr(CVMX_PIP_PRT_CFGX(ipd_port), port_cfg.u64); 63 } 64 65 /* Disable FCS stripping for loopback ports */ 66 ipd_sub_port_fcs.u64 = cvmx_read_csr(CVMX_IPD_SUB_PORT_FCS); 67 ipd_sub_port_fcs.s.port_bit2 = 0; 68 cvmx_write_csr(CVMX_IPD_SUB_PORT_FCS, ipd_sub_port_fcs.u64); 69 return num_ports; 70 } 71 72 /** 73 * Bringup and enable a LOOP interface. After this call packet 74 * I/O should be fully functional. This is called with IPD 75 * enabled but PKO disabled. 76 * 77 * @interface: Interface to bring up 78 * 79 * Returns Zero on success, negative on failure 80 */ 81 int __cvmx_helper_loop_enable(int interface) 82 { 83 /* Do nothing. */ 84 return 0; 85 } 86