xref: /linux/arch/mips/cavium-octeon/executive/cvmx-helper-npi.c (revision 0d456bad36d42d16022be045c8a53ddbb59ee478)
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