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 }