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  */
__cvmx_helper_npi_probe(int interface)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 #endif
63 	return 0;
64 }
65 
66 /**
67  * Bringup and enable a NPI interface. After this call packet
68  * I/O should be fully functional. This is called with IPD
69  * enabled but PKO disabled.
70  *
71  * @interface: Interface to bring up
72  *
73  * Returns Zero on success, negative on failure
74  */
__cvmx_helper_npi_enable(int interface)75 int __cvmx_helper_npi_enable(int interface)
76 {
77 	/*
78 	 * On CN50XX, CN52XX, and CN56XX we need to disable length
79 	 * checking so packet < 64 bytes and jumbo frames don't get
80 	 * errors.
81 	 */
82 	if (!OCTEON_IS_MODEL(OCTEON_CN3XXX) &&
83 	    !OCTEON_IS_MODEL(OCTEON_CN58XX)) {
84 		int num_ports = cvmx_helper_ports_on_interface(interface);
85 		int port;
86 		for (port = 0; port < num_ports; port++) {
87 			union cvmx_pip_prt_cfgx port_cfg;
88 			int ipd_port =
89 			    cvmx_helper_get_ipd_port(interface, port);
90 			port_cfg.u64 =
91 			    cvmx_read_csr(CVMX_PIP_PRT_CFGX(ipd_port));
92 			port_cfg.s.maxerr_en = 0;
93 			port_cfg.s.minerr_en = 0;
94 			cvmx_write_csr(CVMX_PIP_PRT_CFGX(ipd_port),
95 				       port_cfg.u64);
96 		}
97 	}
98 
99 	/* Enables are controlled by the remote host, so nothing to do here */
100 	return 0;
101 }
102