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TOMOYO Linux Cross Reference
Linux/arch/mips/cavium-octeon/executive/cvmx-helper-npi.c

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  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 NPI 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 
 38 #include <asm/octeon/cvmx-pip-defs.h>
 39 
 40 /**
 41  * Probe a NPI interface and determine the number of ports
 42  * connected to it. The NPI interface should still be down
 43  * after this call.
 44  *
 45  * @interface: Interface to probe
 46  *
 47  * Returns Number of ports on the interface. Zero to disable.
 48  */
 49 int __cvmx_helper_npi_probe(int interface)
 50 {
 51 #if CVMX_PKO_QUEUES_PER_PORT_PCI > 0
 52         if (OCTEON_IS_MODEL(OCTEON_CN38XX) || OCTEON_IS_MODEL(OCTEON_CN58XX))
 53                 return 4;
 54         else if (OCTEON_IS_MODEL(OCTEON_CN56XX)
 55                  && !OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X))
 56                 /* The packet engines didn't exist before pass 2 */
 57                 return 4;
 58         else if (OCTEON_IS_MODEL(OCTEON_CN52XX)
 59                  && !OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X))
 60                 /* The packet engines didn't exist before pass 2 */
 61                 return 4;
 62 #if 0
 63         /*
 64          * Technically CN30XX, CN31XX, and CN50XX contain packet
 65          * engines, but nobody ever uses them. Since this is the case,
 66          * we disable them here.
 67          */
 68         else if (OCTEON_IS_MODEL(OCTEON_CN31XX)
 69                  || OCTEON_IS_MODEL(OCTEON_CN50XX))
 70                 return 2;
 71         else if (OCTEON_IS_MODEL(OCTEON_CN30XX))
 72                 return 1;
 73 #endif
 74 #endif
 75         return 0;
 76 }
 77 
 78 /**
 79  * Bringup and enable a NPI interface. After this call packet
 80  * I/O should be fully functional. This is called with IPD
 81  * enabled but PKO disabled.
 82  *
 83  * @interface: Interface to bring up
 84  *
 85  * Returns Zero on success, negative on failure
 86  */
 87 int __cvmx_helper_npi_enable(int interface)
 88 {
 89         /*
 90          * On CN50XX, CN52XX, and CN56XX we need to disable length
 91          * checking so packet < 64 bytes and jumbo frames don't get
 92          * errors.
 93          */
 94         if (!OCTEON_IS_MODEL(OCTEON_CN3XXX) &&
 95             !OCTEON_IS_MODEL(OCTEON_CN58XX)) {
 96                 int num_ports = cvmx_helper_ports_on_interface(interface);
 97                 int port;
 98                 for (port = 0; port < num_ports; port++) {
 99                         union cvmx_pip_prt_cfgx port_cfg;
100                         int ipd_port =
101                             cvmx_helper_get_ipd_port(interface, port);
102                         port_cfg.u64 =
103                             cvmx_read_csr(CVMX_PIP_PRT_CFGX(ipd_port));
104                         port_cfg.s.maxerr_en = 0;
105                         port_cfg.s.minerr_en = 0;
106                         cvmx_write_csr(CVMX_PIP_PRT_CFGX(ipd_port),
107                                        port_cfg.u64);
108                 }
109         }
110 
111         /* Enables are controlled by the remote host, so nothing to do here */
112         return 0;
113 }
114 

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