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 RGMII/GMII/MII initialization, configuration,
30 * and monitoring.
31 */
32 #include <asm/octeon/octeon.h>
33
34 #include <asm/octeon/cvmx-config.h>
35
36
37 #include <asm/octeon/cvmx-mdio.h>
38 #include <asm/octeon/cvmx-pko.h>
39 #include <asm/octeon/cvmx-helper.h>
40 #include <asm/octeon/cvmx-helper-board.h>
41
42 #include <asm/octeon/cvmx-npi-defs.h>
43 #include <asm/octeon/cvmx-gmxx-defs.h>
44 #include <asm/octeon/cvmx-asxx-defs.h>
45 #include <asm/octeon/cvmx-dbg-defs.h>
46
47 void __cvmx_interrupt_gmxx_enable(int interface);
48 void __cvmx_interrupt_asxx_enable(int block);
49
50 /**
51 * Probe RGMII ports and determine the number present
52 *
53 * @interface: Interface to probe
54 *
55 * Returns Number of RGMII/GMII/MII ports (0-4).
56 */
__cvmx_helper_rgmii_probe(int interface)57 int __cvmx_helper_rgmii_probe(int interface)
58 {
59 int num_ports = 0;
60 union cvmx_gmxx_inf_mode mode;
61 mode.u64 = cvmx_read_csr(CVMX_GMXX_INF_MODE(interface));
62
63 if (mode.s.type) {
64 if (OCTEON_IS_MODEL(OCTEON_CN38XX)
65 || OCTEON_IS_MODEL(OCTEON_CN58XX)) {
66 cvmx_dprintf("ERROR: RGMII initialize called in "
67 "SPI interface\n");
68 } else if (OCTEON_IS_MODEL(OCTEON_CN31XX)
69 || OCTEON_IS_MODEL(OCTEON_CN30XX)
70 || OCTEON_IS_MODEL(OCTEON_CN50XX)) {
71 /*
72 * On these chips "type" says we're in
73 * GMII/MII mode. This limits us to 2 ports
74 */
75 num_ports = 2;
76 } else {
77 cvmx_dprintf("ERROR: Unsupported Octeon model in %s\n",
78 __func__);
79 }
80 } else {
81 if (OCTEON_IS_MODEL(OCTEON_CN38XX)
82 || OCTEON_IS_MODEL(OCTEON_CN58XX)) {
83 num_ports = 4;
84 } else if (OCTEON_IS_MODEL(OCTEON_CN31XX)
85 || OCTEON_IS_MODEL(OCTEON_CN30XX)
86 || OCTEON_IS_MODEL(OCTEON_CN50XX)) {
87 num_ports = 3;
88 } else {
89 cvmx_dprintf("ERROR: Unsupported Octeon model in %s\n",
90 __func__);
91 }
92 }
93 return num_ports;
94 }
95
96 /**
97 * Put an RGMII interface in loopback mode. Internal packets sent
98 * out will be received back again on the same port. Externally
99 * received packets will echo back out.
100 *
101 * @port: IPD port number to loop.
102 */
cvmx_helper_rgmii_internal_loopback(int port)103 void cvmx_helper_rgmii_internal_loopback(int port)
104 {
105 int interface = (port >> 4) & 1;
106 int index = port & 0xf;
107 uint64_t tmp;
108
109 union cvmx_gmxx_prtx_cfg gmx_cfg;
110 gmx_cfg.u64 = 0;
111 gmx_cfg.s.duplex = 1;
112 gmx_cfg.s.slottime = 1;
113 gmx_cfg.s.speed = 1;
114 cvmx_write_csr(CVMX_GMXX_TXX_CLK(index, interface), 1);
115 cvmx_write_csr(CVMX_GMXX_TXX_SLOT(index, interface), 0x200);
116 cvmx_write_csr(CVMX_GMXX_TXX_BURST(index, interface), 0x2000);
117 cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);
118 tmp = cvmx_read_csr(CVMX_ASXX_PRT_LOOP(interface));
119 cvmx_write_csr(CVMX_ASXX_PRT_LOOP(interface), (1 << index) | tmp);
120 tmp = cvmx_read_csr(CVMX_ASXX_TX_PRT_EN(interface));
121 cvmx_write_csr(CVMX_ASXX_TX_PRT_EN(interface), (1 << index) | tmp);
122 tmp = cvmx_read_csr(CVMX_ASXX_RX_PRT_EN(interface));
123 cvmx_write_csr(CVMX_ASXX_RX_PRT_EN(interface), (1 << index) | tmp);
124 gmx_cfg.s.en = 1;
125 cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);
126 }
127
128 /**
129 * Workaround ASX setup errata with CN38XX pass1
130 *
131 * @interface: Interface to setup
132 * @port: Port to setup (0..3)
133 * @cpu_clock_hz:
134 * Chip frequency in Hertz
135 *
136 * Returns Zero on success, negative on failure
137 */
__cvmx_helper_errata_asx_pass1(int interface,int port,int cpu_clock_hz)138 static int __cvmx_helper_errata_asx_pass1(int interface, int port,
139 int cpu_clock_hz)
140 {
141 /* Set hi water mark as per errata GMX-4 */
142 if (cpu_clock_hz >= 325000000 && cpu_clock_hz < 375000000)
143 cvmx_write_csr(CVMX_ASXX_TX_HI_WATERX(port, interface), 12);
144 else if (cpu_clock_hz >= 375000000 && cpu_clock_hz < 437000000)
145 cvmx_write_csr(CVMX_ASXX_TX_HI_WATERX(port, interface), 11);
146 else if (cpu_clock_hz >= 437000000 && cpu_clock_hz < 550000000)
147 cvmx_write_csr(CVMX_ASXX_TX_HI_WATERX(port, interface), 10);
148 else if (cpu_clock_hz >= 550000000 && cpu_clock_hz < 687000000)
149 cvmx_write_csr(CVMX_ASXX_TX_HI_WATERX(port, interface), 9);
150 else
151 cvmx_dprintf("Illegal clock frequency (%d). "
152 "CVMX_ASXX_TX_HI_WATERX not set\n", cpu_clock_hz);
153 return 0;
154 }
155
156 /**
157 * Configure all of the ASX, GMX, and PKO regsiters required
158 * to get RGMII to function on the supplied interface.
159 *
160 * @interface: PKO Interface to configure (0 or 1)
161 *
162 * Returns Zero on success
163 */
__cvmx_helper_rgmii_enable(int interface)164 int __cvmx_helper_rgmii_enable(int interface)
165 {
166 int num_ports = cvmx_helper_ports_on_interface(interface);
167 int port;
168 struct cvmx_sysinfo *sys_info_ptr = cvmx_sysinfo_get();
169 union cvmx_gmxx_inf_mode mode;
170 union cvmx_asxx_tx_prt_en asx_tx;
171 union cvmx_asxx_rx_prt_en asx_rx;
172
173 mode.u64 = cvmx_read_csr(CVMX_GMXX_INF_MODE(interface));
174
175 if (mode.s.en == 0)
176 return -1;
177 if ((OCTEON_IS_MODEL(OCTEON_CN38XX) ||
178 OCTEON_IS_MODEL(OCTEON_CN58XX)) && mode.s.type == 1)
179 /* Ignore SPI interfaces */
180 return -1;
181
182 /* Configure the ASX registers needed to use the RGMII ports */
183 asx_tx.u64 = 0;
184 asx_tx.s.prt_en = cvmx_build_mask(num_ports);
185 cvmx_write_csr(CVMX_ASXX_TX_PRT_EN(interface), asx_tx.u64);
186
187 asx_rx.u64 = 0;
188 asx_rx.s.prt_en = cvmx_build_mask(num_ports);
189 cvmx_write_csr(CVMX_ASXX_RX_PRT_EN(interface), asx_rx.u64);
190
191 /* Configure the GMX registers needed to use the RGMII ports */
192 for (port = 0; port < num_ports; port++) {
193 /* Setting of CVMX_GMXX_TXX_THRESH has been moved to
194 __cvmx_helper_setup_gmx() */
195
196 if (cvmx_octeon_is_pass1())
197 __cvmx_helper_errata_asx_pass1(interface, port,
198 sys_info_ptr->
199 cpu_clock_hz);
200 else {
201 /*
202 * Configure more flexible RGMII preamble
203 * checking. Pass 1 doesn't support this
204 * feature.
205 */
206 union cvmx_gmxx_rxx_frm_ctl frm_ctl;
207 frm_ctl.u64 =
208 cvmx_read_csr(CVMX_GMXX_RXX_FRM_CTL
209 (port, interface));
210 /* New field, so must be compile time */
211 frm_ctl.s.pre_free = 1;
212 cvmx_write_csr(CVMX_GMXX_RXX_FRM_CTL(port, interface),
213 frm_ctl.u64);
214 }
215
216 /*
217 * Each pause frame transmitted will ask for about 10M
218 * bit times before resume. If buffer space comes
219 * available before that time has expired, an XON
220 * pause frame (0 time) will be transmitted to restart
221 * the flow.
222 */
223 cvmx_write_csr(CVMX_GMXX_TXX_PAUSE_PKT_TIME(port, interface),
224 20000);
225 cvmx_write_csr(CVMX_GMXX_TXX_PAUSE_PKT_INTERVAL
226 (port, interface), 19000);
227
228 if (OCTEON_IS_MODEL(OCTEON_CN50XX)) {
229 cvmx_write_csr(CVMX_ASXX_TX_CLK_SETX(port, interface),
230 16);
231 cvmx_write_csr(CVMX_ASXX_RX_CLK_SETX(port, interface),
232 16);
233 } else {
234 cvmx_write_csr(CVMX_ASXX_TX_CLK_SETX(port, interface),
235 24);
236 cvmx_write_csr(CVMX_ASXX_RX_CLK_SETX(port, interface),
237 24);
238 }
239 }
240
241 __cvmx_helper_setup_gmx(interface, num_ports);
242
243 /* enable the ports now */
244 for (port = 0; port < num_ports; port++) {
245 union cvmx_gmxx_prtx_cfg gmx_cfg;
246 cvmx_helper_link_autoconf(cvmx_helper_get_ipd_port
247 (interface, port));
248 gmx_cfg.u64 =
249 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(port, interface));
250 gmx_cfg.s.en = 1;
251 cvmx_write_csr(CVMX_GMXX_PRTX_CFG(port, interface),
252 gmx_cfg.u64);
253 }
254 __cvmx_interrupt_asxx_enable(interface);
255 __cvmx_interrupt_gmxx_enable(interface);
256
257 return 0;
258 }
259
260 /**
261 * Return the link state of an IPD/PKO port as returned by
262 * auto negotiation. The result of this function may not match
263 * Octeon's link config if auto negotiation has changed since
264 * the last call to cvmx_helper_link_set().
265 *
266 * @ipd_port: IPD/PKO port to query
267 *
268 * Returns Link state
269 */
__cvmx_helper_rgmii_link_get(int ipd_port)270 cvmx_helper_link_info_t __cvmx_helper_rgmii_link_get(int ipd_port)
271 {
272 int interface = cvmx_helper_get_interface_num(ipd_port);
273 int index = cvmx_helper_get_interface_index_num(ipd_port);
274 union cvmx_asxx_prt_loop asxx_prt_loop;
275
276 asxx_prt_loop.u64 = cvmx_read_csr(CVMX_ASXX_PRT_LOOP(interface));
277 if (asxx_prt_loop.s.int_loop & (1 << index)) {
278 /* Force 1Gbps full duplex on internal loopback */
279 cvmx_helper_link_info_t result;
280 result.u64 = 0;
281 result.s.full_duplex = 1;
282 result.s.link_up = 1;
283 result.s.speed = 1000;
284 return result;
285 } else
286 return __cvmx_helper_board_link_get(ipd_port);
287 }
288
289 /**
290 * Configure an IPD/PKO port for the specified link state. This
291 * function does not influence auto negotiation at the PHY level.
292 * The passed link state must always match the link state returned
293 * by cvmx_helper_link_get(). It is normally best to use
294 * cvmx_helper_link_autoconf() instead.
295 *
296 * @ipd_port: IPD/PKO port to configure
297 * @link_info: The new link state
298 *
299 * Returns Zero on success, negative on failure
300 */
__cvmx_helper_rgmii_link_set(int ipd_port,cvmx_helper_link_info_t link_info)301 int __cvmx_helper_rgmii_link_set(int ipd_port,
302 cvmx_helper_link_info_t link_info)
303 {
304 int result = 0;
305 int interface = cvmx_helper_get_interface_num(ipd_port);
306 int index = cvmx_helper_get_interface_index_num(ipd_port);
307 union cvmx_gmxx_prtx_cfg original_gmx_cfg;
308 union cvmx_gmxx_prtx_cfg new_gmx_cfg;
309 union cvmx_pko_mem_queue_qos pko_mem_queue_qos;
310 union cvmx_pko_mem_queue_qos pko_mem_queue_qos_save[16];
311 union cvmx_gmxx_tx_ovr_bp gmx_tx_ovr_bp;
312 union cvmx_gmxx_tx_ovr_bp gmx_tx_ovr_bp_save;
313 int i;
314
315 /* Ignore speed sets in the simulator */
316 if (cvmx_sysinfo_get()->board_type == CVMX_BOARD_TYPE_SIM)
317 return 0;
318
319 /* Read the current settings so we know the current enable state */
320 original_gmx_cfg.u64 =
321 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
322 new_gmx_cfg = original_gmx_cfg;
323
324 /* Disable the lowest level RX */
325 cvmx_write_csr(CVMX_ASXX_RX_PRT_EN(interface),
326 cvmx_read_csr(CVMX_ASXX_RX_PRT_EN(interface)) &
327 ~(1 << index));
328
329 memset(pko_mem_queue_qos_save, 0, sizeof(pko_mem_queue_qos_save));
330 /* Disable all queues so that TX should become idle */
331 for (i = 0; i < cvmx_pko_get_num_queues(ipd_port); i++) {
332 int queue = cvmx_pko_get_base_queue(ipd_port) + i;
333 cvmx_write_csr(CVMX_PKO_REG_READ_IDX, queue);
334 pko_mem_queue_qos.u64 = cvmx_read_csr(CVMX_PKO_MEM_QUEUE_QOS);
335 pko_mem_queue_qos.s.pid = ipd_port;
336 pko_mem_queue_qos.s.qid = queue;
337 pko_mem_queue_qos_save[i] = pko_mem_queue_qos;
338 pko_mem_queue_qos.s.qos_mask = 0;
339 cvmx_write_csr(CVMX_PKO_MEM_QUEUE_QOS, pko_mem_queue_qos.u64);
340 }
341
342 /* Disable backpressure */
343 gmx_tx_ovr_bp.u64 = cvmx_read_csr(CVMX_GMXX_TX_OVR_BP(interface));
344 gmx_tx_ovr_bp_save = gmx_tx_ovr_bp;
345 gmx_tx_ovr_bp.s.bp &= ~(1 << index);
346 gmx_tx_ovr_bp.s.en |= 1 << index;
347 cvmx_write_csr(CVMX_GMXX_TX_OVR_BP(interface), gmx_tx_ovr_bp.u64);
348 cvmx_read_csr(CVMX_GMXX_TX_OVR_BP(interface));
349
350 /*
351 * Poll the GMX state machine waiting for it to become
352 * idle. Preferably we should only change speed when it is
353 * idle. If it doesn't become idle we will still do the speed
354 * change, but there is a slight chance that GMX will
355 * lockup.
356 */
357 cvmx_write_csr(CVMX_NPI_DBG_SELECT,
358 interface * 0x800 + index * 0x100 + 0x880);
359 CVMX_WAIT_FOR_FIELD64(CVMX_DBG_DATA, union cvmx_dbg_data, data & 7,
360 ==, 0, 10000);
361 CVMX_WAIT_FOR_FIELD64(CVMX_DBG_DATA, union cvmx_dbg_data, data & 0xf,
362 ==, 0, 10000);
363
364 /* Disable the port before we make any changes */
365 new_gmx_cfg.s.en = 0;
366 cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface), new_gmx_cfg.u64);
367 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
368
369 /* Set full/half duplex */
370 if (cvmx_octeon_is_pass1())
371 /* Half duplex is broken for 38XX Pass 1 */
372 new_gmx_cfg.s.duplex = 1;
373 else if (!link_info.s.link_up)
374 /* Force full duplex on down links */
375 new_gmx_cfg.s.duplex = 1;
376 else
377 new_gmx_cfg.s.duplex = link_info.s.full_duplex;
378
379 /* Set the link speed. Anything unknown is set to 1Gbps */
380 if (link_info.s.speed == 10) {
381 new_gmx_cfg.s.slottime = 0;
382 new_gmx_cfg.s.speed = 0;
383 } else if (link_info.s.speed == 100) {
384 new_gmx_cfg.s.slottime = 0;
385 new_gmx_cfg.s.speed = 0;
386 } else {
387 new_gmx_cfg.s.slottime = 1;
388 new_gmx_cfg.s.speed = 1;
389 }
390
391 /* Adjust the clocks */
392 if (link_info.s.speed == 10) {
393 cvmx_write_csr(CVMX_GMXX_TXX_CLK(index, interface), 50);
394 cvmx_write_csr(CVMX_GMXX_TXX_SLOT(index, interface), 0x40);
395 cvmx_write_csr(CVMX_GMXX_TXX_BURST(index, interface), 0);
396 } else if (link_info.s.speed == 100) {
397 cvmx_write_csr(CVMX_GMXX_TXX_CLK(index, interface), 5);
398 cvmx_write_csr(CVMX_GMXX_TXX_SLOT(index, interface), 0x40);
399 cvmx_write_csr(CVMX_GMXX_TXX_BURST(index, interface), 0);
400 } else {
401 cvmx_write_csr(CVMX_GMXX_TXX_CLK(index, interface), 1);
402 cvmx_write_csr(CVMX_GMXX_TXX_SLOT(index, interface), 0x200);
403 cvmx_write_csr(CVMX_GMXX_TXX_BURST(index, interface), 0x2000);
404 }
405
406 if (OCTEON_IS_MODEL(OCTEON_CN30XX) || OCTEON_IS_MODEL(OCTEON_CN50XX)) {
407 if ((link_info.s.speed == 10) || (link_info.s.speed == 100)) {
408 union cvmx_gmxx_inf_mode mode;
409 mode.u64 = cvmx_read_csr(CVMX_GMXX_INF_MODE(interface));
410
411 /*
412 * Port .en .type .p0mii Configuration
413 * ---- --- ----- ------ -----------------------------------------
414 * X 0 X X All links are disabled.
415 * 0 1 X 0 Port 0 is RGMII
416 * 0 1 X 1 Port 0 is MII
417 * 1 1 0 X Ports 1 and 2 are configured as RGMII ports.
418 * 1 1 1 X Port 1: GMII/MII; Port 2: disabled. GMII or
419 * MII port is selected by GMX_PRT1_CFG[SPEED].
420 */
421
422 /* In MII mode, CLK_CNT = 1. */
423 if (((index == 0) && (mode.s.p0mii == 1))
424 || ((index != 0) && (mode.s.type == 1))) {
425 cvmx_write_csr(CVMX_GMXX_TXX_CLK
426 (index, interface), 1);
427 }
428 }
429 }
430
431 /* Do a read to make sure all setup stuff is complete */
432 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
433
434 /* Save the new GMX setting without enabling the port */
435 cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface), new_gmx_cfg.u64);
436
437 /* Enable the lowest level RX */
438 cvmx_write_csr(CVMX_ASXX_RX_PRT_EN(interface),
439 cvmx_read_csr(CVMX_ASXX_RX_PRT_EN(interface)) | (1 <<
440 index));
441
442 /* Re-enable the TX path */
443 for (i = 0; i < cvmx_pko_get_num_queues(ipd_port); i++) {
444 int queue = cvmx_pko_get_base_queue(ipd_port) + i;
445 cvmx_write_csr(CVMX_PKO_REG_READ_IDX, queue);
446 cvmx_write_csr(CVMX_PKO_MEM_QUEUE_QOS,
447 pko_mem_queue_qos_save[i].u64);
448 }
449
450 /* Restore backpressure */
451 cvmx_write_csr(CVMX_GMXX_TX_OVR_BP(interface), gmx_tx_ovr_bp_save.u64);
452
453 /* Restore the GMX enable state. Port config is complete */
454 new_gmx_cfg.s.en = original_gmx_cfg.s.en;
455 cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface), new_gmx_cfg.u64);
456
457 return result;
458 }
459
460 /**
461 * Configure a port for internal and/or external loopback. Internal loopback
462 * causes packets sent by the port to be received by Octeon. External loopback
463 * causes packets received from the wire to sent out again.
464 *
465 * @ipd_port: IPD/PKO port to loopback.
466 * @enable_internal:
467 * Non zero if you want internal loopback
468 * @enable_external:
469 * Non zero if you want external loopback
470 *
471 * Returns Zero on success, negative on failure.
472 */
__cvmx_helper_rgmii_configure_loopback(int ipd_port,int enable_internal,int enable_external)473 int __cvmx_helper_rgmii_configure_loopback(int ipd_port, int enable_internal,
474 int enable_external)
475 {
476 int interface = cvmx_helper_get_interface_num(ipd_port);
477 int index = cvmx_helper_get_interface_index_num(ipd_port);
478 int original_enable;
479 union cvmx_gmxx_prtx_cfg gmx_cfg;
480 union cvmx_asxx_prt_loop asxx_prt_loop;
481
482 /* Read the current enable state and save it */
483 gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
484 original_enable = gmx_cfg.s.en;
485 /* Force port to be disabled */
486 gmx_cfg.s.en = 0;
487 if (enable_internal) {
488 /* Force speed if we're doing internal loopback */
489 gmx_cfg.s.duplex = 1;
490 gmx_cfg.s.slottime = 1;
491 gmx_cfg.s.speed = 1;
492 cvmx_write_csr(CVMX_GMXX_TXX_CLK(index, interface), 1);
493 cvmx_write_csr(CVMX_GMXX_TXX_SLOT(index, interface), 0x200);
494 cvmx_write_csr(CVMX_GMXX_TXX_BURST(index, interface), 0x2000);
495 }
496 cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);
497
498 /* Set the loopback bits */
499 asxx_prt_loop.u64 = cvmx_read_csr(CVMX_ASXX_PRT_LOOP(interface));
500 if (enable_internal)
501 asxx_prt_loop.s.int_loop |= 1 << index;
502 else
503 asxx_prt_loop.s.int_loop &= ~(1 << index);
504 if (enable_external)
505 asxx_prt_loop.s.ext_loop |= 1 << index;
506 else
507 asxx_prt_loop.s.ext_loop &= ~(1 << index);
508 cvmx_write_csr(CVMX_ASXX_PRT_LOOP(interface), asxx_prt_loop.u64);
509
510 /* Force enables in internal loopback */
511 if (enable_internal) {
512 uint64_t tmp;
513 tmp = cvmx_read_csr(CVMX_ASXX_TX_PRT_EN(interface));
514 cvmx_write_csr(CVMX_ASXX_TX_PRT_EN(interface),
515 (1 << index) | tmp);
516 tmp = cvmx_read_csr(CVMX_ASXX_RX_PRT_EN(interface));
517 cvmx_write_csr(CVMX_ASXX_RX_PRT_EN(interface),
518 (1 << index) | tmp);
519 original_enable = 1;
520 }
521
522 /* Restore the enable state */
523 gmx_cfg.s.en = original_enable;
524 cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);
525 return 0;
526 }
527