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