drivers/staging/octeon/cvmx-helper-npi.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 NPI initialization, configuration,
  30  * and monitoring.
  31  */
  32 #include <asm/octeon/octeon.h>
  33
  34 #include "cvmx-config.h"
  35
  36 #include "cvmx-helper.h"
  37
  38 #include "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 }