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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/mips/cavium-octeon/executive/cvmx-helper-loop.c
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/***********************license start***************

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 * Author: Cavium Networks

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 *

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 * Contact: [email protected]

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 * This file is part of the OCTEON SDK

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 *

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 * Copyright (c) 2003-2008 Cavium Networks

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 *

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 * This file is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License, Version 2, as

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 * published by the Free Software Foundation.

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 *

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 * This file is distributed in the hope that it will be useful, but

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 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty

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 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or

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 * NONINFRINGEMENT.  See the GNU General Public License for more

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 * details.

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 *

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 * You should have received a copy of the GNU General Public License

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 * along with this file; if not, write to the Free Software

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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

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 * or visit http://www.gnu.org/licenses/.

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 *

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 * This file may also be available under a different license from Cavium.

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 * Contact Cavium Networks for more information

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 ***********************license end**************************************/

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/*

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 * Functions for LOOP initialization, configuration,

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 * and monitoring.

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 */

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#include <asm/octeon/octeon.h>

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#include <asm/octeon/cvmx-config.h>

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#include <asm/octeon/cvmx-helper.h>

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#include <asm/octeon/cvmx-pip-defs.h>

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/**

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 * Probe a LOOP interface and determine the number of ports

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 * connected to it. The LOOP interface should still be down

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 * after this call.

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 *

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 * @interface: Interface to probe

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 *

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 * Returns Number of ports on the interface. Zero to disable.

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 */

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int __cvmx_helper_loop_probe(int interface)

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{

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	union cvmx_ipd_sub_port_fcs ipd_sub_port_fcs;

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	int num_ports = 4;

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	int port;

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	/* We need to disable length checking so packet < 64 bytes and jumbo

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	   frames don't get errors */

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	for (port = 0; port < num_ports; port++) {

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		union cvmx_pip_prt_cfgx port_cfg;

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		int ipd_port = cvmx_helper_get_ipd_port(interface, port);

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		port_cfg.u64 = cvmx_read_csr(CVMX_PIP_PRT_CFGX(ipd_port));

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		port_cfg.s.maxerr_en = 0;

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		port_cfg.s.minerr_en = 0;

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		cvmx_write_csr(CVMX_PIP_PRT_CFGX(ipd_port), port_cfg.u64);

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	}

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	/* Disable FCS stripping for loopback ports */

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	ipd_sub_port_fcs.u64 = cvmx_read_csr(CVMX_IPD_SUB_PORT_FCS);

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	ipd_sub_port_fcs.s.port_bit2 = 0;

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	cvmx_write_csr(CVMX_IPD_SUB_PORT_FCS, ipd_sub_port_fcs.u64);

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	return num_ports;

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}

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/**

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 * Bringup and enable a LOOP interface. After this call packet

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 * I/O should be fully functional. This is called with IPD

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 * enabled but PKO disabled.

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 *

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 * @interface: Interface to bring up

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 *

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 * Returns Zero on success, negative on failure

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 */

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int __cvmx_helper_loop_enable(int interface)

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{

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	/* Do nothing. */

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	return 0;

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}

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