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) 2003-2018 Cavium, Inc.
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 SPI initialization, configuration,
30  * and monitoring.
31  */
32 #include <asm/octeon/octeon.h>
33 
34 #include <asm/octeon/cvmx-config.h>
35 #include <asm/octeon/cvmx-spi.h>
36 #include <asm/octeon/cvmx-helper.h>
37 
38 #include <asm/octeon/cvmx-pip-defs.h>
39 #include <asm/octeon/cvmx-pko-defs.h>
40 #include <asm/octeon/cvmx-spxx-defs.h>
41 #include <asm/octeon/cvmx-stxx-defs.h>
42 
43 /*
44  * CVMX_HELPER_SPI_TIMEOUT is used to determine how long the SPI
45  * initialization routines wait for SPI training. You can override the
46  * value using executive-config.h if necessary.
47  */
48 #ifndef CVMX_HELPER_SPI_TIMEOUT
49 #define CVMX_HELPER_SPI_TIMEOUT 10
50 #endif
51 
52 int __cvmx_helper_spi_enumerate(int interface)
53 {
54 	if ((cvmx_sysinfo_get()->board_type != CVMX_BOARD_TYPE_SIM) &&
55 	    cvmx_spi4000_is_present(interface)) {
56 		return 10;
57 	} else {
58 		return 16;
59 	}
60 }
61 
62 /**
63  * Probe a SPI interface and determine the number of ports
64  * connected to it. The SPI interface should still be down after
65  * this call.
66  *
67  * @interface: Interface to probe
68  *
69  * Returns Number of ports on the interface. Zero to disable.
70  */
71 int __cvmx_helper_spi_probe(int interface)
72 {
73 	int num_ports = 0;
74 
75 	if ((cvmx_sysinfo_get()->board_type != CVMX_BOARD_TYPE_SIM) &&
76 	    cvmx_spi4000_is_present(interface)) {
77 		num_ports = 10;
78 	} else {
79 		union cvmx_pko_reg_crc_enable enable;
80 		num_ports = 16;
81 		/*
82 		 * Unlike the SPI4000, most SPI devices don't
83 		 * automatically put on the L2 CRC. For everything
84 		 * except for the SPI4000 have PKO append the L2 CRC
85 		 * to the packet.
86 		 */
87 		enable.u64 = cvmx_read_csr(CVMX_PKO_REG_CRC_ENABLE);
88 		enable.s.enable |= 0xffff << (interface * 16);
89 		cvmx_write_csr(CVMX_PKO_REG_CRC_ENABLE, enable.u64);
90 	}
91 	__cvmx_helper_setup_gmx(interface, num_ports);
92 	return num_ports;
93 }
94 
95 /**
96  * Bringup and enable a SPI interface. After this call packet I/O
97  * should be fully functional. This is called with IPD enabled but
98  * PKO disabled.
99  *
100  * @interface: Interface to bring up
101  *
102  * Returns Zero on success, negative on failure
103  */
104 int __cvmx_helper_spi_enable(int interface)
105 {
106 	/*
107 	 * Normally the ethernet L2 CRC is checked and stripped in the
108 	 * GMX block.  When you are using SPI, this isn' the case and
109 	 * IPD needs to check the L2 CRC.
110 	 */
111 	int num_ports = cvmx_helper_ports_on_interface(interface);
112 	int ipd_port;
113 	for (ipd_port = interface * 16; ipd_port < interface * 16 + num_ports;
114 	     ipd_port++) {
115 		union cvmx_pip_prt_cfgx port_config;
116 		port_config.u64 = cvmx_read_csr(CVMX_PIP_PRT_CFGX(ipd_port));
117 		port_config.s.crc_en = 1;
118 		cvmx_write_csr(CVMX_PIP_PRT_CFGX(ipd_port), port_config.u64);
119 	}
120 
121 	if (cvmx_sysinfo_get()->board_type != CVMX_BOARD_TYPE_SIM) {
122 		cvmx_spi_start_interface(interface, CVMX_SPI_MODE_DUPLEX,
123 					 CVMX_HELPER_SPI_TIMEOUT, num_ports);
124 		if (cvmx_spi4000_is_present(interface))
125 			cvmx_spi4000_initialize(interface);
126 	}
127 	__cvmx_interrupt_spxx_int_msk_enable(interface);
128 	__cvmx_interrupt_stxx_int_msk_enable(interface);
129 	__cvmx_interrupt_gmxx_enable(interface);
130 	return 0;
131 }
132 
133 /**
134  * Return the link state of an IPD/PKO port as returned by
135  * auto negotiation. The result of this function may not match
136  * Octeon's link config if auto negotiation has changed since
137  * the last call to cvmx_helper_link_set().
138  *
139  * @ipd_port: IPD/PKO port to query
140  *
141  * Returns Link state
142  */
143 union cvmx_helper_link_info __cvmx_helper_spi_link_get(int ipd_port)
144 {
145 	union cvmx_helper_link_info result;
146 	int interface = cvmx_helper_get_interface_num(ipd_port);
147 	int index = cvmx_helper_get_interface_index_num(ipd_port);
148 	result.u64 = 0;
149 
150 	if (cvmx_sysinfo_get()->board_type == CVMX_BOARD_TYPE_SIM) {
151 		/* The simulator gives you a simulated full duplex link */
152 		result.s.link_up = 1;
153 		result.s.full_duplex = 1;
154 		result.s.speed = 10000;
155 	} else if (cvmx_spi4000_is_present(interface)) {
156 		union cvmx_gmxx_rxx_rx_inbnd inband =
157 		    cvmx_spi4000_check_speed(interface, index);
158 		result.s.link_up = inband.s.status;
159 		result.s.full_duplex = inband.s.duplex;
160 		switch (inband.s.speed) {
161 		case 0: /* 10 Mbps */
162 			result.s.speed = 10;
163 			break;
164 		case 1: /* 100 Mbps */
165 			result.s.speed = 100;
166 			break;
167 		case 2: /* 1 Gbps */
168 			result.s.speed = 1000;
169 			break;
170 		case 3: /* Illegal */
171 			result.s.speed = 0;
172 			result.s.link_up = 0;
173 			break;
174 		}
175 	} else {
176 		/* For generic SPI we can't determine the link, just return some
177 		   sane results */
178 		result.s.link_up = 1;
179 		result.s.full_duplex = 1;
180 		result.s.speed = 10000;
181 	}
182 	return result;
183 }
184 
185 /**
186  * Configure an IPD/PKO port for the specified link state. This
187  * function does not influence auto negotiation at the PHY level.
188  * The passed link state must always match the link state returned
189  * by cvmx_helper_link_get().
190  *
191  * @ipd_port:  IPD/PKO port to configure
192  * @link_info: The new link state
193  *
194  * Returns Zero on success, negative on failure
195  */
196 int __cvmx_helper_spi_link_set(int ipd_port, union cvmx_helper_link_info link_info)
197 {
198 	/* Nothing to do. If we have a SPI4000 then the setup was already performed
199 	   by cvmx_spi4000_check_speed(). If not then there isn't any link
200 	   info */
201 	return 0;
202 }
203