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 * Small helper utilities.
30 */
31 #include <linux/kernel.h>
32
33 #include <asm/octeon/octeon.h>
34
35 #include <asm/octeon/cvmx-config.h>
36
37 #include <asm/octeon/cvmx-fpa.h>
38 #include <asm/octeon/cvmx-pip.h>
39 #include <asm/octeon/cvmx-pko.h>
40 #include <asm/octeon/cvmx-ipd.h>
41 #include <asm/octeon/cvmx-spi.h>
42
43 #include <asm/octeon/cvmx-helper.h>
44 #include <asm/octeon/cvmx-helper-util.h>
45
46 #include <asm/octeon/cvmx-ipd-defs.h>
47
48 /**
49 * Convert a interface mode into a human readable string
50 *
51 * @mode: Mode to convert
52 *
53 * Returns String
54 */
55 const char *cvmx_helper_interface_mode_to_string(cvmx_helper_interface_mode_t
56 mode)
57 {
58 switch (mode) {
59 case CVMX_HELPER_INTERFACE_MODE_DISABLED:
60 return "DISABLED";
61 case CVMX_HELPER_INTERFACE_MODE_RGMII:
62 return "RGMII";
63 case CVMX_HELPER_INTERFACE_MODE_GMII:
64 return "GMII";
65 case CVMX_HELPER_INTERFACE_MODE_SPI:
66 return "SPI";
67 case CVMX_HELPER_INTERFACE_MODE_PCIE:
68 return "PCIE";
69 case CVMX_HELPER_INTERFACE_MODE_XAUI:
70 return "XAUI";
71 case CVMX_HELPER_INTERFACE_MODE_SGMII:
72 return "SGMII";
73 case CVMX_HELPER_INTERFACE_MODE_PICMG:
74 return "PICMG";
75 case CVMX_HELPER_INTERFACE_MODE_NPI:
76 return "NPI";
77 case CVMX_HELPER_INTERFACE_MODE_LOOP:
78 return "LOOP";
79 }
80 return "UNKNOWN";
81 }
82
83 /**
84 * Setup Random Early Drop on a specific input queue
85 *
86 * @queue: Input queue to setup RED on (0-7)
87 * @pass_thresh:
88 * Packets will begin slowly dropping when there are less than
89 * this many packet buffers free in FPA 0.
90 * @drop_thresh:
91 * All incoming packets will be dropped when there are less
92 * than this many free packet buffers in FPA 0.
93 * Returns Zero on success. Negative on failure
94 */
95 static int cvmx_helper_setup_red_queue(int queue, int pass_thresh,
96 int drop_thresh)
97 {
98 union cvmx_ipd_qosx_red_marks red_marks;
99 union cvmx_ipd_red_quex_param red_param;
100
101 /* Set RED to begin dropping packets when there are pass_thresh buffers
102 left. It will linearly drop more packets until reaching drop_thresh
103 buffers */
104 red_marks.u64 = 0;
105 red_marks.s.drop = drop_thresh;
106 red_marks.s.pass = pass_thresh;
107 cvmx_write_csr(CVMX_IPD_QOSX_RED_MARKS(queue), red_marks.u64);
108
109 /* Use the actual queue 0 counter, not the average */
110 red_param.u64 = 0;
111 red_param.s.prb_con =
112 (255ul << 24) / (red_marks.s.pass - red_marks.s.drop);
113 red_param.s.avg_con = 1;
114 red_param.s.new_con = 255;
115 red_param.s.use_pcnt = 1;
116 cvmx_write_csr(CVMX_IPD_RED_QUEX_PARAM(queue), red_param.u64);
117 return 0;
118 }
119
120 /**
121 * Setup Random Early Drop to automatically begin dropping packets.
122 *
123 * @pass_thresh:
124 * Packets will begin slowly dropping when there are less than
125 * this many packet buffers free in FPA 0.
126 * @drop_thresh:
127 * All incoming packets will be dropped when there are less
128 * than this many free packet buffers in FPA 0.
129 * Returns Zero on success. Negative on failure
130 */
131 int cvmx_helper_setup_red(int pass_thresh, int drop_thresh)
132 {
133 union cvmx_ipd_portx_bp_page_cnt page_cnt;
134 union cvmx_ipd_bp_prt_red_end ipd_bp_prt_red_end;
135 union cvmx_ipd_red_port_enable red_port_enable;
136 int queue;
137 int interface;
138 int port;
139
140 /* Disable backpressure based on queued buffers. It needs SW support */
141 page_cnt.u64 = 0;
142 page_cnt.s.bp_enb = 0;
143 page_cnt.s.page_cnt = 100;
144 for (interface = 0; interface < 2; interface++) {
145 for (port = cvmx_helper_get_first_ipd_port(interface);
146 port < cvmx_helper_get_last_ipd_port(interface); port++)
147 cvmx_write_csr(CVMX_IPD_PORTX_BP_PAGE_CNT(port),
148 page_cnt.u64);
149 }
150
151 for (queue = 0; queue < 8; queue++)
152 cvmx_helper_setup_red_queue(queue, pass_thresh, drop_thresh);
153
154 /* Shutoff the dropping based on the per port page count. SW isn't
155 decrementing it right now */
156 ipd_bp_prt_red_end.u64 = 0;
157 ipd_bp_prt_red_end.s.prt_enb = 0;
158 cvmx_write_csr(CVMX_IPD_BP_PRT_RED_END, ipd_bp_prt_red_end.u64);
159
160 red_port_enable.u64 = 0;
161 red_port_enable.s.prt_enb = 0xfffffffffull;
162 red_port_enable.s.avg_dly = 10000;
163 red_port_enable.s.prb_dly = 10000;
164 cvmx_write_csr(CVMX_IPD_RED_PORT_ENABLE, red_port_enable.u64);
165
166 return 0;
167 }
168 EXPORT_SYMBOL_GPL(cvmx_helper_setup_red);
169
170 /**
171 * Setup the common GMX settings that determine the number of
172 * ports. These setting apply to almost all configurations of all
173 * chips.
174 *
175 * @interface: Interface to configure
176 * @num_ports: Number of ports on the interface
177 *
178 * Returns Zero on success, negative on failure
179 */
180 int __cvmx_helper_setup_gmx(int interface, int num_ports)
181 {
182 union cvmx_gmxx_tx_prts gmx_tx_prts;
183 union cvmx_gmxx_rx_prts gmx_rx_prts;
184 union cvmx_pko_reg_gmx_port_mode pko_mode;
185 union cvmx_gmxx_txx_thresh gmx_tx_thresh;
186 int index;
187
188 /* Tell GMX the number of TX ports on this interface */
189 gmx_tx_prts.u64 = cvmx_read_csr(CVMX_GMXX_TX_PRTS(interface));
190 gmx_tx_prts.s.prts = num_ports;
191 cvmx_write_csr(CVMX_GMXX_TX_PRTS(interface), gmx_tx_prts.u64);
192
193 /* Tell GMX the number of RX ports on this interface. This only
194 ** applies to *GMII and XAUI ports */
195 if (cvmx_helper_interface_get_mode(interface) ==
196 CVMX_HELPER_INTERFACE_MODE_RGMII
197 || cvmx_helper_interface_get_mode(interface) ==
198 CVMX_HELPER_INTERFACE_MODE_SGMII
199 || cvmx_helper_interface_get_mode(interface) ==
200 CVMX_HELPER_INTERFACE_MODE_GMII
201 || cvmx_helper_interface_get_mode(interface) ==
202 CVMX_HELPER_INTERFACE_MODE_XAUI) {
203 if (num_ports > 4) {
204 cvmx_dprintf("__cvmx_helper_setup_gmx: Illegal "
205 "num_ports\n");
206 return -1;
207 }
208
209 gmx_rx_prts.u64 = cvmx_read_csr(CVMX_GMXX_RX_PRTS(interface));
210 gmx_rx_prts.s.prts = num_ports;
211 cvmx_write_csr(CVMX_GMXX_RX_PRTS(interface), gmx_rx_prts.u64);
212 }
213
214 /* Skip setting CVMX_PKO_REG_GMX_PORT_MODE on 30XX, 31XX, and 50XX */
215 if (!OCTEON_IS_MODEL(OCTEON_CN30XX) && !OCTEON_IS_MODEL(OCTEON_CN31XX)
216 && !OCTEON_IS_MODEL(OCTEON_CN50XX)) {
217 /* Tell PKO the number of ports on this interface */
218 pko_mode.u64 = cvmx_read_csr(CVMX_PKO_REG_GMX_PORT_MODE);
219 if (interface == 0) {
220 if (num_ports == 1)
221 pko_mode.s.mode0 = 4;
222 else if (num_ports == 2)
223 pko_mode.s.mode0 = 3;
224 else if (num_ports <= 4)
225 pko_mode.s.mode0 = 2;
226 else if (num_ports <= 8)
227 pko_mode.s.mode0 = 1;
228 else
229 pko_mode.s.mode0 = 0;
230 } else {
231 if (num_ports == 1)
232 pko_mode.s.mode1 = 4;
233 else if (num_ports == 2)
234 pko_mode.s.mode1 = 3;
235 else if (num_ports <= 4)
236 pko_mode.s.mode1 = 2;
237 else if (num_ports <= 8)
238 pko_mode.s.mode1 = 1;
239 else
240 pko_mode.s.mode1 = 0;
241 }
242 cvmx_write_csr(CVMX_PKO_REG_GMX_PORT_MODE, pko_mode.u64);
243 }
244
245 /*
246 * Set GMX to buffer as much data as possible before starting
247 * transmit. This reduces the chances that we have a TX under
248 * run due to memory contention. Any packet that fits entirely
249 * in the GMX FIFO can never have an under run regardless of
250 * memory load.
251 */
252 gmx_tx_thresh.u64 = cvmx_read_csr(CVMX_GMXX_TXX_THRESH(0, interface));
253 if (OCTEON_IS_MODEL(OCTEON_CN30XX) || OCTEON_IS_MODEL(OCTEON_CN31XX)
254 || OCTEON_IS_MODEL(OCTEON_CN50XX)) {
255 /* These chips have a fixed max threshold of 0x40 */
256 gmx_tx_thresh.s.cnt = 0x40;
257 } else {
258 /* Choose the max value for the number of ports */
259 if (num_ports <= 1)
260 gmx_tx_thresh.s.cnt = 0x100 / 1;
261 else if (num_ports == 2)
262 gmx_tx_thresh.s.cnt = 0x100 / 2;
263 else
264 gmx_tx_thresh.s.cnt = 0x100 / 4;
265 }
266 /*
267 * SPI and XAUI can have lots of ports but the GMX hardware
268 * only ever has a max of 4.
269 */
270 if (num_ports > 4)
271 num_ports = 4;
272 for (index = 0; index < num_ports; index++)
273 cvmx_write_csr(CVMX_GMXX_TXX_THRESH(index, interface),
274 gmx_tx_thresh.u64);
275
276 return 0;
277 }
278
279 /**
280 * Returns the IPD/PKO port number for a port on the given
281 * interface.
282 *
283 * @interface: Interface to use
284 * @port: Port on the interface
285 *
286 * Returns IPD/PKO port number
287 */
288 int cvmx_helper_get_ipd_port(int interface, int port)
289 {
290 switch (interface) {
291 case 0:
292 return port;
293 case 1:
294 return port + 16;
295 case 2:
296 return port + 32;
297 case 3:
298 return port + 36;
299 case 4:
300 return port + 40;
301 case 5:
302 return port + 44;
303 }
304 return -1;
305 }
306 EXPORT_SYMBOL_GPL(cvmx_helper_get_ipd_port);
307
308 /**
309 * Returns the interface number for an IPD/PKO port number.
310 *
311 * @ipd_port: IPD/PKO port number
312 *
313 * Returns Interface number
314 */
315 int cvmx_helper_get_interface_num(int ipd_port)
316 {
317 if (ipd_port < 16)
318 return 0;
319 else if (ipd_port < 32)
320 return 1;
321 else if (ipd_port < 36)
322 return 2;
323 else if (ipd_port < 40)
324 return 3;
325 else if (ipd_port < 44)
326 return 4;
327 else if (ipd_port < 48)
328 return 5;
329 else
330 cvmx_dprintf("cvmx_helper_get_interface_num: Illegal IPD "
331 "port number\n");
332
333 return -1;
334 }
335 EXPORT_SYMBOL_GPL(cvmx_helper_get_interface_num);
336
337 /**
338 * Returns the interface index number for an IPD/PKO port
339 * number.
340 *
341 * @ipd_port: IPD/PKO port number
342 *
343 * Returns Interface index number
344 */
345 int cvmx_helper_get_interface_index_num(int ipd_port)
346 {
347 if (ipd_port < 32)
348 return ipd_port & 15;
349 else if (ipd_port < 36)
350 return ipd_port & 3;
351 else if (ipd_port < 40)
352 return ipd_port & 3;
353 else if (ipd_port < 44)
354 return ipd_port & 3;
355 else if (ipd_port < 48)
356 return ipd_port & 3;
357 else
358 cvmx_dprintf("cvmx_helper_get_interface_index_num: "
359 "Illegal IPD port number\n");
360
361 return -1;
362 }
363 EXPORT_SYMBOL_GPL(cvmx_helper_get_interface_index_num);
364
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