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 *
30 * Support library for the SPI
31 */
32 #include <asm/octeon/octeon.h>
33
34 #include <asm/octeon/cvmx-config.h>
35
36 #include <asm/octeon/cvmx-pko.h>
37 #include <asm/octeon/cvmx-spi.h>
38
39 #include <asm/octeon/cvmx-spxx-defs.h>
40 #include <asm/octeon/cvmx-stxx-defs.h>
41 #include <asm/octeon/cvmx-srxx-defs.h>
42
43 #define INVOKE_CB(function_p, args...) \
44 do { \
45 if (function_p) { \
46 res = function_p(args); \
47 if (res) \
48 return res; \
49 } \
50 } while (0)
51
52 #if CVMX_ENABLE_DEBUG_PRINTS
53 static const char *modes[] =
54 { "UNKNOWN", "TX Halfplex", "Rx Halfplex", "Duplex" };
55 #endif
56
57 /* Default callbacks, can be overridden
58 * using cvmx_spi_get_callbacks/cvmx_spi_set_callbacks
59 */
60 static cvmx_spi_callbacks_t cvmx_spi_callbacks = {
61 .reset_cb = cvmx_spi_reset_cb,
62 .calendar_setup_cb = cvmx_spi_calendar_setup_cb,
63 .clock_detect_cb = cvmx_spi_clock_detect_cb,
64 .training_cb = cvmx_spi_training_cb,
65 .calendar_sync_cb = cvmx_spi_calendar_sync_cb,
66 .interface_up_cb = cvmx_spi_interface_up_cb
67 };
68
69 /*
70 * Get current SPI4 initialization callbacks
71 *
72 * @callbacks: Pointer to the callbacks structure.to fill
73 *
74 * Returns Pointer to cvmx_spi_callbacks_t structure.
75 */
76 void cvmx_spi_get_callbacks(cvmx_spi_callbacks_t *callbacks)
77 {
78 memcpy(callbacks, &cvmx_spi_callbacks, sizeof(cvmx_spi_callbacks));
79 }
80
81 /*
82 * Set new SPI4 initialization callbacks
83 *
84 * @new_callbacks: Pointer to an updated callbacks structure.
85 */
86 void cvmx_spi_set_callbacks(cvmx_spi_callbacks_t *new_callbacks)
87 {
88 memcpy(&cvmx_spi_callbacks, new_callbacks, sizeof(cvmx_spi_callbacks));
89 }
90
91 /*
92 * Initialize and start the SPI interface.
93 *
94 * @interface: The identifier of the packet interface to configure and
95 * use as a SPI interface.
96 * @mode: The operating mode for the SPI interface. The interface
97 * can operate as a full duplex (both Tx and Rx data paths
98 * active) or as a halfplex (either the Tx data path is
99 * active or the Rx data path is active, but not both).
100 * @timeout: Timeout to wait for clock synchronization in seconds
101 * @num_ports: Number of SPI ports to configure
102 *
103 * Returns Zero on success, negative of failure.
104 */
105 int cvmx_spi_start_interface(int interface, cvmx_spi_mode_t mode, int timeout,
106 int num_ports)
107 {
108 int res = -1;
109
110 if (!(OCTEON_IS_MODEL(OCTEON_CN38XX) || OCTEON_IS_MODEL(OCTEON_CN58XX)))
111 return res;
112
113 /* Callback to perform SPI4 reset */
114 INVOKE_CB(cvmx_spi_callbacks.reset_cb, interface, mode);
115
116 /* Callback to perform calendar setup */
117 INVOKE_CB(cvmx_spi_callbacks.calendar_setup_cb, interface, mode,
118 num_ports);
119
120 /* Callback to perform clock detection */
121 INVOKE_CB(cvmx_spi_callbacks.clock_detect_cb, interface, mode, timeout);
122
123 /* Callback to perform SPI4 link training */
124 INVOKE_CB(cvmx_spi_callbacks.training_cb, interface, mode, timeout);
125
126 /* Callback to perform calendar sync */
127 INVOKE_CB(cvmx_spi_callbacks.calendar_sync_cb, interface, mode,
128 timeout);
129
130 /* Callback to handle interface coming up */
131 INVOKE_CB(cvmx_spi_callbacks.interface_up_cb, interface, mode);
132
133 return res;
134 }
135
136 /*
137 * This routine restarts the SPI interface after it has lost synchronization
138 * with its correspondent system.
139 *
140 * @interface: The identifier of the packet interface to configure and
141 * use as a SPI interface.
142 * @mode: The operating mode for the SPI interface. The interface
143 * can operate as a full duplex (both Tx and Rx data paths
144 * active) or as a halfplex (either the Tx data path is
145 * active or the Rx data path is active, but not both).
146 * @timeout: Timeout to wait for clock synchronization in seconds
147 *
148 * Returns Zero on success, negative of failure.
149 */
150 int cvmx_spi_restart_interface(int interface, cvmx_spi_mode_t mode, int timeout)
151 {
152 int res = -1;
153
154 if (!(OCTEON_IS_MODEL(OCTEON_CN38XX) || OCTEON_IS_MODEL(OCTEON_CN58XX)))
155 return res;
156
157 cvmx_dprintf("SPI%d: Restart %s\n", interface, modes[mode]);
158
159 /* Callback to perform SPI4 reset */
160 INVOKE_CB(cvmx_spi_callbacks.reset_cb, interface, mode);
161
162 /* NOTE: Calendar setup is not performed during restart */
163 /* Refer to cvmx_spi_start_interface() for the full sequence */
164
165 /* Callback to perform clock detection */
166 INVOKE_CB(cvmx_spi_callbacks.clock_detect_cb, interface, mode, timeout);
167
168 /* Callback to perform SPI4 link training */
169 INVOKE_CB(cvmx_spi_callbacks.training_cb, interface, mode, timeout);
170
171 /* Callback to perform calendar sync */
172 INVOKE_CB(cvmx_spi_callbacks.calendar_sync_cb, interface, mode,
173 timeout);
174
175 /* Callback to handle interface coming up */
176 INVOKE_CB(cvmx_spi_callbacks.interface_up_cb, interface, mode);
177
178 return res;
179 }
180 EXPORT_SYMBOL_GPL(cvmx_spi_restart_interface);
181
182 /*
183 * Callback to perform SPI4 reset
184 *
185 * @interface: The identifier of the packet interface to configure and
186 * use as a SPI interface.
187 * @mode: The operating mode for the SPI interface. The interface
188 * can operate as a full duplex (both Tx and Rx data paths
189 * active) or as a halfplex (either the Tx data path is
190 * active or the Rx data path is active, but not both).
191 *
192 * Returns Zero on success, non-zero error code on failure (will cause
193 * SPI initialization to abort)
194 */
195 int cvmx_spi_reset_cb(int interface, cvmx_spi_mode_t mode)
196 {
197 union cvmx_spxx_dbg_deskew_ctl spxx_dbg_deskew_ctl;
198 union cvmx_spxx_clk_ctl spxx_clk_ctl;
199 union cvmx_spxx_bist_stat spxx_bist_stat;
200 union cvmx_spxx_int_msk spxx_int_msk;
201 union cvmx_stxx_int_msk stxx_int_msk;
202 union cvmx_spxx_trn4_ctl spxx_trn4_ctl;
203 int index;
204 uint64_t MS = cvmx_sysinfo_get()->cpu_clock_hz / 1000;
205
206 /* Disable SPI error events while we run BIST */
207 spxx_int_msk.u64 = cvmx_read_csr(CVMX_SPXX_INT_MSK(interface));
208 cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), 0);
209 stxx_int_msk.u64 = cvmx_read_csr(CVMX_STXX_INT_MSK(interface));
210 cvmx_write_csr(CVMX_STXX_INT_MSK(interface), 0);
211
212 /* Run BIST in the SPI interface */
213 cvmx_write_csr(CVMX_SRXX_COM_CTL(interface), 0);
214 cvmx_write_csr(CVMX_STXX_COM_CTL(interface), 0);
215 spxx_clk_ctl.u64 = 0;
216 spxx_clk_ctl.s.runbist = 1;
217 cvmx_write_csr(CVMX_SPXX_CLK_CTL(interface), spxx_clk_ctl.u64);
218 __delay(10 * MS);
219 spxx_bist_stat.u64 = cvmx_read_csr(CVMX_SPXX_BIST_STAT(interface));
220 if (spxx_bist_stat.s.stat0)
221 cvmx_dprintf
222 ("ERROR SPI%d: BIST failed on receive datapath FIFO\n",
223 interface);
224 if (spxx_bist_stat.s.stat1)
225 cvmx_dprintf("ERROR SPI%d: BIST failed on RX calendar table\n",
226 interface);
227 if (spxx_bist_stat.s.stat2)
228 cvmx_dprintf("ERROR SPI%d: BIST failed on TX calendar table\n",
229 interface);
230
231 /* Clear the calendar table after BIST to fix parity errors */
232 for (index = 0; index < 32; index++) {
233 union cvmx_srxx_spi4_calx srxx_spi4_calx;
234 union cvmx_stxx_spi4_calx stxx_spi4_calx;
235
236 srxx_spi4_calx.u64 = 0;
237 srxx_spi4_calx.s.oddpar = 1;
238 cvmx_write_csr(CVMX_SRXX_SPI4_CALX(index, interface),
239 srxx_spi4_calx.u64);
240
241 stxx_spi4_calx.u64 = 0;
242 stxx_spi4_calx.s.oddpar = 1;
243 cvmx_write_csr(CVMX_STXX_SPI4_CALX(index, interface),
244 stxx_spi4_calx.u64);
245 }
246
247 /* Re enable reporting of error interrupts */
248 cvmx_write_csr(CVMX_SPXX_INT_REG(interface),
249 cvmx_read_csr(CVMX_SPXX_INT_REG(interface)));
250 cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), spxx_int_msk.u64);
251 cvmx_write_csr(CVMX_STXX_INT_REG(interface),
252 cvmx_read_csr(CVMX_STXX_INT_REG(interface)));
253 cvmx_write_csr(CVMX_STXX_INT_MSK(interface), stxx_int_msk.u64);
254
255 /* Setup the CLKDLY right in the middle */
256 spxx_clk_ctl.u64 = 0;
257 spxx_clk_ctl.s.seetrn = 0;
258 spxx_clk_ctl.s.clkdly = 0x10;
259 spxx_clk_ctl.s.runbist = 0;
260 spxx_clk_ctl.s.statdrv = 0;
261 /* This should always be on the opposite edge as statdrv */
262 spxx_clk_ctl.s.statrcv = 1;
263 spxx_clk_ctl.s.sndtrn = 0;
264 spxx_clk_ctl.s.drptrn = 0;
265 spxx_clk_ctl.s.rcvtrn = 0;
266 spxx_clk_ctl.s.srxdlck = 0;
267 cvmx_write_csr(CVMX_SPXX_CLK_CTL(interface), spxx_clk_ctl.u64);
268 __delay(100 * MS);
269
270 /* Reset SRX0 DLL */
271 spxx_clk_ctl.s.srxdlck = 1;
272 cvmx_write_csr(CVMX_SPXX_CLK_CTL(interface), spxx_clk_ctl.u64);
273
274 /* Waiting for Inf0 Spi4 RX DLL to lock */
275 __delay(100 * MS);
276
277 /* Enable dynamic alignment */
278 spxx_trn4_ctl.s.trntest = 0;
279 spxx_trn4_ctl.s.jitter = 1;
280 spxx_trn4_ctl.s.clr_boot = 1;
281 spxx_trn4_ctl.s.set_boot = 0;
282 if (OCTEON_IS_MODEL(OCTEON_CN58XX))
283 spxx_trn4_ctl.s.maxdist = 3;
284 else
285 spxx_trn4_ctl.s.maxdist = 8;
286 spxx_trn4_ctl.s.macro_en = 1;
287 spxx_trn4_ctl.s.mux_en = 1;
288 cvmx_write_csr(CVMX_SPXX_TRN4_CTL(interface), spxx_trn4_ctl.u64);
289
290 spxx_dbg_deskew_ctl.u64 = 0;
291 cvmx_write_csr(CVMX_SPXX_DBG_DESKEW_CTL(interface),
292 spxx_dbg_deskew_ctl.u64);
293
294 return 0;
295 }
296
297 /*
298 * Callback to setup calendar and miscellaneous settings before clock detection
299 *
300 * @interface: The identifier of the packet interface to configure and
301 * use as a SPI interface.
302 * @mode: The operating mode for the SPI interface. The interface
303 * can operate as a full duplex (both Tx and Rx data paths
304 * active) or as a halfplex (either the Tx data path is
305 * active or the Rx data path is active, but not both).
306 * @num_ports: Number of ports to configure on SPI
307 *
308 * Returns Zero on success, non-zero error code on failure (will cause
309 * SPI initialization to abort)
310 */
311 int cvmx_spi_calendar_setup_cb(int interface, cvmx_spi_mode_t mode,
312 int num_ports)
313 {
314 int port;
315 int index;
316 if (mode & CVMX_SPI_MODE_RX_HALFPLEX) {
317 union cvmx_srxx_com_ctl srxx_com_ctl;
318 union cvmx_srxx_spi4_stat srxx_spi4_stat;
319
320 /* SRX0 number of Ports */
321 srxx_com_ctl.u64 = 0;
322 srxx_com_ctl.s.prts = num_ports - 1;
323 srxx_com_ctl.s.st_en = 0;
324 srxx_com_ctl.s.inf_en = 0;
325 cvmx_write_csr(CVMX_SRXX_COM_CTL(interface), srxx_com_ctl.u64);
326
327 /* SRX0 Calendar Table. This round robbins through all ports */
328 port = 0;
329 index = 0;
330 while (port < num_ports) {
331 union cvmx_srxx_spi4_calx srxx_spi4_calx;
332 srxx_spi4_calx.u64 = 0;
333 srxx_spi4_calx.s.prt0 = port++;
334 srxx_spi4_calx.s.prt1 = port++;
335 srxx_spi4_calx.s.prt2 = port++;
336 srxx_spi4_calx.s.prt3 = port++;
337 srxx_spi4_calx.s.oddpar =
338 ~(cvmx_dpop(srxx_spi4_calx.u64) & 1);
339 cvmx_write_csr(CVMX_SRXX_SPI4_CALX(index, interface),
340 srxx_spi4_calx.u64);
341 index++;
342 }
343 srxx_spi4_stat.u64 = 0;
344 srxx_spi4_stat.s.len = num_ports;
345 srxx_spi4_stat.s.m = 1;
346 cvmx_write_csr(CVMX_SRXX_SPI4_STAT(interface),
347 srxx_spi4_stat.u64);
348 }
349
350 if (mode & CVMX_SPI_MODE_TX_HALFPLEX) {
351 union cvmx_stxx_arb_ctl stxx_arb_ctl;
352 union cvmx_gmxx_tx_spi_max gmxx_tx_spi_max;
353 union cvmx_gmxx_tx_spi_thresh gmxx_tx_spi_thresh;
354 union cvmx_gmxx_tx_spi_ctl gmxx_tx_spi_ctl;
355 union cvmx_stxx_spi4_stat stxx_spi4_stat;
356 union cvmx_stxx_spi4_dat stxx_spi4_dat;
357
358 /* STX0 Config */
359 stxx_arb_ctl.u64 = 0;
360 stxx_arb_ctl.s.igntpa = 0;
361 stxx_arb_ctl.s.mintrn = 0;
362 cvmx_write_csr(CVMX_STXX_ARB_CTL(interface), stxx_arb_ctl.u64);
363
364 gmxx_tx_spi_max.u64 = 0;
365 gmxx_tx_spi_max.s.max1 = 8;
366 gmxx_tx_spi_max.s.max2 = 4;
367 gmxx_tx_spi_max.s.slice = 0;
368 cvmx_write_csr(CVMX_GMXX_TX_SPI_MAX(interface),
369 gmxx_tx_spi_max.u64);
370
371 gmxx_tx_spi_thresh.u64 = 0;
372 gmxx_tx_spi_thresh.s.thresh = 4;
373 cvmx_write_csr(CVMX_GMXX_TX_SPI_THRESH(interface),
374 gmxx_tx_spi_thresh.u64);
375
376 gmxx_tx_spi_ctl.u64 = 0;
377 gmxx_tx_spi_ctl.s.tpa_clr = 0;
378 gmxx_tx_spi_ctl.s.cont_pkt = 0;
379 cvmx_write_csr(CVMX_GMXX_TX_SPI_CTL(interface),
380 gmxx_tx_spi_ctl.u64);
381
382 /* STX0 Training Control */
383 stxx_spi4_dat.u64 = 0;
384 /*Minimum needed by dynamic alignment */
385 stxx_spi4_dat.s.alpha = 32;
386 stxx_spi4_dat.s.max_t = 0xFFFF; /*Minimum interval is 0x20 */
387 cvmx_write_csr(CVMX_STXX_SPI4_DAT(interface),
388 stxx_spi4_dat.u64);
389
390 /* STX0 Calendar Table. This round robbins through all ports */
391 port = 0;
392 index = 0;
393 while (port < num_ports) {
394 union cvmx_stxx_spi4_calx stxx_spi4_calx;
395 stxx_spi4_calx.u64 = 0;
396 stxx_spi4_calx.s.prt0 = port++;
397 stxx_spi4_calx.s.prt1 = port++;
398 stxx_spi4_calx.s.prt2 = port++;
399 stxx_spi4_calx.s.prt3 = port++;
400 stxx_spi4_calx.s.oddpar =
401 ~(cvmx_dpop(stxx_spi4_calx.u64) & 1);
402 cvmx_write_csr(CVMX_STXX_SPI4_CALX(index, interface),
403 stxx_spi4_calx.u64);
404 index++;
405 }
406 stxx_spi4_stat.u64 = 0;
407 stxx_spi4_stat.s.len = num_ports;
408 stxx_spi4_stat.s.m = 1;
409 cvmx_write_csr(CVMX_STXX_SPI4_STAT(interface),
410 stxx_spi4_stat.u64);
411 }
412
413 return 0;
414 }
415
416 /*
417 * Callback to perform clock detection
418 *
419 * @interface: The identifier of the packet interface to configure and
420 * use as a SPI interface.
421 * @mode: The operating mode for the SPI interface. The interface
422 * can operate as a full duplex (both Tx and Rx data paths
423 * active) or as a halfplex (either the Tx data path is
424 * active or the Rx data path is active, but not both).
425 * @timeout: Timeout to wait for clock synchronization in seconds
426 *
427 * Returns Zero on success, non-zero error code on failure (will cause
428 * SPI initialization to abort)
429 */
430 int cvmx_spi_clock_detect_cb(int interface, cvmx_spi_mode_t mode, int timeout)
431 {
432 int clock_transitions;
433 union cvmx_spxx_clk_stat stat;
434 uint64_t timeout_time;
435 uint64_t MS = cvmx_sysinfo_get()->cpu_clock_hz / 1000;
436
437 /*
438 * Regardless of operating mode, both Tx and Rx clocks must be
439 * present for the SPI interface to operate.
440 */
441 cvmx_dprintf("SPI%d: Waiting to see TsClk...\n", interface);
442 timeout_time = cvmx_get_cycle() + 1000ull * MS * timeout;
443 /*
444 * Require 100 clock transitions in order to avoid any noise
445 * in the beginning.
446 */
447 clock_transitions = 100;
448 do {
449 stat.u64 = cvmx_read_csr(CVMX_SPXX_CLK_STAT(interface));
450 if (stat.s.s4clk0 && stat.s.s4clk1 && clock_transitions) {
451 /*
452 * We've seen a clock transition, so decrement
453 * the number we still need.
454 */
455 clock_transitions--;
456 cvmx_write_csr(CVMX_SPXX_CLK_STAT(interface), stat.u64);
457 stat.s.s4clk0 = 0;
458 stat.s.s4clk1 = 0;
459 }
460 if (cvmx_get_cycle() > timeout_time) {
461 cvmx_dprintf("SPI%d: Timeout\n", interface);
462 return -1;
463 }
464 } while (stat.s.s4clk0 == 0 || stat.s.s4clk1 == 0);
465
466 cvmx_dprintf("SPI%d: Waiting to see RsClk...\n", interface);
467 timeout_time = cvmx_get_cycle() + 1000ull * MS * timeout;
468 /*
469 * Require 100 clock transitions in order to avoid any noise in the
470 * beginning.
471 */
472 clock_transitions = 100;
473 do {
474 stat.u64 = cvmx_read_csr(CVMX_SPXX_CLK_STAT(interface));
475 if (stat.s.d4clk0 && stat.s.d4clk1 && clock_transitions) {
476 /*
477 * We've seen a clock transition, so decrement
478 * the number we still need
479 */
480 clock_transitions--;
481 cvmx_write_csr(CVMX_SPXX_CLK_STAT(interface), stat.u64);
482 stat.s.d4clk0 = 0;
483 stat.s.d4clk1 = 0;
484 }
485 if (cvmx_get_cycle() > timeout_time) {
486 cvmx_dprintf("SPI%d: Timeout\n", interface);
487 return -1;
488 }
489 } while (stat.s.d4clk0 == 0 || stat.s.d4clk1 == 0);
490
491 return 0;
492 }
493
494 /*
495 * Callback to perform link training
496 *
497 * @interface: The identifier of the packet interface to configure and
498 * use as a SPI interface.
499 * @mode: The operating mode for the SPI interface. The interface
500 * can operate as a full duplex (both Tx and Rx data paths
501 * active) or as a halfplex (either the Tx data path is
502 * active or the Rx data path is active, but not both).
503 * @timeout: Timeout to wait for link to be trained (in seconds)
504 *
505 * Returns Zero on success, non-zero error code on failure (will cause
506 * SPI initialization to abort)
507 */
508 int cvmx_spi_training_cb(int interface, cvmx_spi_mode_t mode, int timeout)
509 {
510 union cvmx_spxx_trn4_ctl spxx_trn4_ctl;
511 union cvmx_spxx_clk_stat stat;
512 uint64_t MS = cvmx_sysinfo_get()->cpu_clock_hz / 1000;
513 uint64_t timeout_time = cvmx_get_cycle() + 1000ull * MS * timeout;
514 int rx_training_needed;
515
516 /* SRX0 & STX0 Inf0 Links are configured - begin training */
517 union cvmx_spxx_clk_ctl spxx_clk_ctl;
518 spxx_clk_ctl.u64 = 0;
519 spxx_clk_ctl.s.seetrn = 0;
520 spxx_clk_ctl.s.clkdly = 0x10;
521 spxx_clk_ctl.s.runbist = 0;
522 spxx_clk_ctl.s.statdrv = 0;
523 /* This should always be on the opposite edge as statdrv */
524 spxx_clk_ctl.s.statrcv = 1;
525 spxx_clk_ctl.s.sndtrn = 1;
526 spxx_clk_ctl.s.drptrn = 1;
527 spxx_clk_ctl.s.rcvtrn = 1;
528 spxx_clk_ctl.s.srxdlck = 1;
529 cvmx_write_csr(CVMX_SPXX_CLK_CTL(interface), spxx_clk_ctl.u64);
530 __delay(1000 * MS);
531
532 /* SRX0 clear the boot bit */
533 spxx_trn4_ctl.u64 = cvmx_read_csr(CVMX_SPXX_TRN4_CTL(interface));
534 spxx_trn4_ctl.s.clr_boot = 1;
535 cvmx_write_csr(CVMX_SPXX_TRN4_CTL(interface), spxx_trn4_ctl.u64);
536
537 /* Wait for the training sequence to complete */
538 cvmx_dprintf("SPI%d: Waiting for training\n", interface);
539 __delay(1000 * MS);
540 /* Wait a really long time here */
541 timeout_time = cvmx_get_cycle() + 1000ull * MS * 600;
542 /*
543 * The HRM says we must wait for 34 + 16 * MAXDIST training sequences.
544 * We'll be pessimistic and wait for a lot more.
545 */
546 rx_training_needed = 500;
547 do {
548 stat.u64 = cvmx_read_csr(CVMX_SPXX_CLK_STAT(interface));
549 if (stat.s.srxtrn && rx_training_needed) {
550 rx_training_needed--;
551 cvmx_write_csr(CVMX_SPXX_CLK_STAT(interface), stat.u64);
552 stat.s.srxtrn = 0;
553 }
554 if (cvmx_get_cycle() > timeout_time) {
555 cvmx_dprintf("SPI%d: Timeout\n", interface);
556 return -1;
557 }
558 } while (stat.s.srxtrn == 0);
559
560 return 0;
561 }
562
563 /*
564 * Callback to perform calendar data synchronization
565 *
566 * @interface: The identifier of the packet interface to configure and
567 * use as a SPI interface.
568 * @mode: The operating mode for the SPI interface. The interface
569 * can operate as a full duplex (both Tx and Rx data paths
570 * active) or as a halfplex (either the Tx data path is
571 * active or the Rx data path is active, but not both).
572 * @timeout: Timeout to wait for calendar data in seconds
573 *
574 * Returns Zero on success, non-zero error code on failure (will cause
575 * SPI initialization to abort)
576 */
577 int cvmx_spi_calendar_sync_cb(int interface, cvmx_spi_mode_t mode, int timeout)
578 {
579 uint64_t MS = cvmx_sysinfo_get()->cpu_clock_hz / 1000;
580 if (mode & CVMX_SPI_MODE_RX_HALFPLEX) {
581 /* SRX0 interface should be good, send calendar data */
582 union cvmx_srxx_com_ctl srxx_com_ctl;
583 cvmx_dprintf
584 ("SPI%d: Rx is synchronized, start sending calendar data\n",
585 interface);
586 srxx_com_ctl.u64 = cvmx_read_csr(CVMX_SRXX_COM_CTL(interface));
587 srxx_com_ctl.s.inf_en = 1;
588 srxx_com_ctl.s.st_en = 1;
589 cvmx_write_csr(CVMX_SRXX_COM_CTL(interface), srxx_com_ctl.u64);
590 }
591
592 if (mode & CVMX_SPI_MODE_TX_HALFPLEX) {
593 /* STX0 has achieved sync */
594 /* The corespondant board should be sending calendar data */
595 /* Enable the STX0 STAT receiver. */
596 union cvmx_spxx_clk_stat stat;
597 uint64_t timeout_time;
598 union cvmx_stxx_com_ctl stxx_com_ctl;
599 stxx_com_ctl.u64 = 0;
600 stxx_com_ctl.s.st_en = 1;
601 cvmx_write_csr(CVMX_STXX_COM_CTL(interface), stxx_com_ctl.u64);
602
603 /* Waiting for calendar sync on STX0 STAT */
604 cvmx_dprintf("SPI%d: Waiting to sync on STX[%d] STAT\n",
605 interface, interface);
606 timeout_time = cvmx_get_cycle() + 1000ull * MS * timeout;
607 /* SPX0_CLK_STAT - SPX0_CLK_STAT[STXCAL] should be 1 (bit10) */
608 do {
609 stat.u64 = cvmx_read_csr(CVMX_SPXX_CLK_STAT(interface));
610 if (cvmx_get_cycle() > timeout_time) {
611 cvmx_dprintf("SPI%d: Timeout\n", interface);
612 return -1;
613 }
614 } while (stat.s.stxcal == 0);
615 }
616
617 return 0;
618 }
619
620 /*
621 * Callback to handle interface up
622 *
623 * @interface: The identifier of the packet interface to configure and
624 * use as a SPI interface.
625 * @mode: The operating mode for the SPI interface. The interface
626 * can operate as a full duplex (both Tx and Rx data paths
627 * active) or as a halfplex (either the Tx data path is
628 * active or the Rx data path is active, but not both).
629 *
630 * Returns Zero on success, non-zero error code on failure (will cause
631 * SPI initialization to abort)
632 */
633 int cvmx_spi_interface_up_cb(int interface, cvmx_spi_mode_t mode)
634 {
635 union cvmx_gmxx_rxx_frm_min gmxx_rxx_frm_min;
636 union cvmx_gmxx_rxx_frm_max gmxx_rxx_frm_max;
637 union cvmx_gmxx_rxx_jabber gmxx_rxx_jabber;
638
639 if (mode & CVMX_SPI_MODE_RX_HALFPLEX) {
640 union cvmx_srxx_com_ctl srxx_com_ctl;
641 srxx_com_ctl.u64 = cvmx_read_csr(CVMX_SRXX_COM_CTL(interface));
642 srxx_com_ctl.s.inf_en = 1;
643 cvmx_write_csr(CVMX_SRXX_COM_CTL(interface), srxx_com_ctl.u64);
644 cvmx_dprintf("SPI%d: Rx is now up\n", interface);
645 }
646
647 if (mode & CVMX_SPI_MODE_TX_HALFPLEX) {
648 union cvmx_stxx_com_ctl stxx_com_ctl;
649 stxx_com_ctl.u64 = cvmx_read_csr(CVMX_STXX_COM_CTL(interface));
650 stxx_com_ctl.s.inf_en = 1;
651 cvmx_write_csr(CVMX_STXX_COM_CTL(interface), stxx_com_ctl.u64);
652 cvmx_dprintf("SPI%d: Tx is now up\n", interface);
653 }
654
655 gmxx_rxx_frm_min.u64 = 0;
656 gmxx_rxx_frm_min.s.len = 64;
657 cvmx_write_csr(CVMX_GMXX_RXX_FRM_MIN(0, interface),
658 gmxx_rxx_frm_min.u64);
659 gmxx_rxx_frm_max.u64 = 0;
660 gmxx_rxx_frm_max.s.len = 64 * 1024 - 4;
661 cvmx_write_csr(CVMX_GMXX_RXX_FRM_MAX(0, interface),
662 gmxx_rxx_frm_max.u64);
663 gmxx_rxx_jabber.u64 = 0;
664 gmxx_rxx_jabber.s.cnt = 64 * 1024 - 4;
665 cvmx_write_csr(CVMX_GMXX_RXX_JABBER(0, interface), gmxx_rxx_jabber.u64);
666
667 return 0;
668 }
669
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.