LXR linux/arch/mips/cavium-octeon/executive/cvmx-helper-loop.c

   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 */
  48int __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 */
  81int __cvmx_helper_loop_enable(int interface)
  82{
  83        /* Do nothing. */
  84        return 0;
  85}
  86