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1// SPDX-License-Identifier: GPL-2.0
2/* TI K3 AM65x Common Platform Time Sync
3 *
4 * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
5 *
6 */
7
8#include <linux/clk.h>
9#include <linux/clk-provider.h>
10#include <linux/err.h>
11#include <linux/if_vlan.h>
12#include <linux/interrupt.h>
13#include <linux/module.h>
14#include <linux/netdevice.h>
15#include <linux/net_tstamp.h>
16#include <linux/of.h>
17#include <linux/of_irq.h>
18#include <linux/platform_device.h>
19#include <linux/pm_runtime.h>
20#include <linux/ptp_classify.h>
21#include <linux/ptp_clock_kernel.h>
22
23#include "am65-cpts.h"
24
25struct am65_genf_regs {
26 u32 comp_lo; /* Comparison Low Value 0:31 */
27 u32 comp_hi; /* Comparison High Value 32:63 */
28 u32 control; /* control */
29 u32 length; /* Length */
30 u32 ppm_low; /* PPM Load Low Value 0:31 */
31 u32 ppm_hi; /* PPM Load High Value 32:63 */
32 u32 ts_nudge; /* Nudge value */
33} __aligned(32) __packed;
34
35#define AM65_CPTS_GENF_MAX_NUM 9
36#define AM65_CPTS_ESTF_MAX_NUM 8
37
38struct am65_cpts_regs {
39 u32 idver; /* Identification and version */
40 u32 control; /* Time sync control */
41 u32 rftclk_sel; /* Reference Clock Select Register */
42 u32 ts_push; /* Time stamp event push */
43 u32 ts_load_val_lo; /* Time Stamp Load Low Value 0:31 */
44 u32 ts_load_en; /* Time stamp load enable */
45 u32 ts_comp_lo; /* Time Stamp Comparison Low Value 0:31 */
46 u32 ts_comp_length; /* Time Stamp Comparison Length */
47 u32 intstat_raw; /* Time sync interrupt status raw */
48 u32 intstat_masked; /* Time sync interrupt status masked */
49 u32 int_enable; /* Time sync interrupt enable */
50 u32 ts_comp_nudge; /* Time Stamp Comparison Nudge Value */
51 u32 event_pop; /* Event interrupt pop */
52 u32 event_0; /* Event Time Stamp lo 0:31 */
53 u32 event_1; /* Event Type Fields */
54 u32 event_2; /* Event Type Fields domain */
55 u32 event_3; /* Event Time Stamp hi 32:63 */
56 u32 ts_load_val_hi; /* Time Stamp Load High Value 32:63 */
57 u32 ts_comp_hi; /* Time Stamp Comparison High Value 32:63 */
58 u32 ts_add_val; /* Time Stamp Add value */
59 u32 ts_ppm_low; /* Time Stamp PPM Load Low Value 0:31 */
60 u32 ts_ppm_hi; /* Time Stamp PPM Load High Value 32:63 */
61 u32 ts_nudge; /* Time Stamp Nudge value */
62 u32 reserv[33];
63 struct am65_genf_regs genf[AM65_CPTS_GENF_MAX_NUM];
64 struct am65_genf_regs estf[AM65_CPTS_ESTF_MAX_NUM];
65};
66
67/* CONTROL_REG */
68#define AM65_CPTS_CONTROL_EN BIT(0)
69#define AM65_CPTS_CONTROL_INT_TEST BIT(1)
70#define AM65_CPTS_CONTROL_TS_COMP_POLARITY BIT(2)
71#define AM65_CPTS_CONTROL_TSTAMP_EN BIT(3)
72#define AM65_CPTS_CONTROL_SEQUENCE_EN BIT(4)
73#define AM65_CPTS_CONTROL_64MODE BIT(5)
74#define AM65_CPTS_CONTROL_TS_COMP_TOG BIT(6)
75#define AM65_CPTS_CONTROL_TS_PPM_DIR BIT(7)
76#define AM65_CPTS_CONTROL_HW1_TS_PUSH_EN BIT(8)
77#define AM65_CPTS_CONTROL_HW2_TS_PUSH_EN BIT(9)
78#define AM65_CPTS_CONTROL_HW3_TS_PUSH_EN BIT(10)
79#define AM65_CPTS_CONTROL_HW4_TS_PUSH_EN BIT(11)
80#define AM65_CPTS_CONTROL_HW5_TS_PUSH_EN BIT(12)
81#define AM65_CPTS_CONTROL_HW6_TS_PUSH_EN BIT(13)
82#define AM65_CPTS_CONTROL_HW7_TS_PUSH_EN BIT(14)
83#define AM65_CPTS_CONTROL_HW8_TS_PUSH_EN BIT(15)
84#define AM65_CPTS_CONTROL_HW1_TS_PUSH_OFFSET (8)
85
86#define AM65_CPTS_CONTROL_TX_GENF_CLR_EN BIT(17)
87
88#define AM65_CPTS_CONTROL_TS_SYNC_SEL_MASK (0xF)
89#define AM65_CPTS_CONTROL_TS_SYNC_SEL_SHIFT (28)
90
91/* RFTCLK_SEL_REG */
92#define AM65_CPTS_RFTCLK_SEL_MASK (0x1F)
93
94/* TS_PUSH_REG */
95#define AM65_CPTS_TS_PUSH BIT(0)
96
97/* TS_LOAD_EN_REG */
98#define AM65_CPTS_TS_LOAD_EN BIT(0)
99
100/* INTSTAT_RAW_REG */
101#define AM65_CPTS_INTSTAT_RAW_TS_PEND BIT(0)
102
103/* INTSTAT_MASKED_REG */
104#define AM65_CPTS_INTSTAT_MASKED_TS_PEND BIT(0)
105
106/* INT_ENABLE_REG */
107#define AM65_CPTS_INT_ENABLE_TS_PEND_EN BIT(0)
108
109/* TS_COMP_NUDGE_REG */
110#define AM65_CPTS_TS_COMP_NUDGE_MASK (0xFF)
111
112/* EVENT_POP_REG */
113#define AM65_CPTS_EVENT_POP BIT(0)
114
115/* EVENT_1_REG */
116#define AM65_CPTS_EVENT_1_SEQUENCE_ID_MASK GENMASK(15, 0)
117
118#define AM65_CPTS_EVENT_1_MESSAGE_TYPE_MASK GENMASK(19, 16)
119#define AM65_CPTS_EVENT_1_MESSAGE_TYPE_SHIFT (16)
120
121#define AM65_CPTS_EVENT_1_EVENT_TYPE_MASK GENMASK(23, 20)
122#define AM65_CPTS_EVENT_1_EVENT_TYPE_SHIFT (20)
123
124#define AM65_CPTS_EVENT_1_PORT_NUMBER_MASK GENMASK(28, 24)
125#define AM65_CPTS_EVENT_1_PORT_NUMBER_SHIFT (24)
126
127/* EVENT_2_REG */
128#define AM65_CPTS_EVENT_2_REG_DOMAIN_MASK (0xFF)
129#define AM65_CPTS_EVENT_2_REG_DOMAIN_SHIFT (0)
130
131enum {
132 AM65_CPTS_EV_PUSH, /* Time Stamp Push Event */
133 AM65_CPTS_EV_ROLL, /* Time Stamp Rollover Event */
134 AM65_CPTS_EV_HALF, /* Time Stamp Half Rollover Event */
135 AM65_CPTS_EV_HW, /* Hardware Time Stamp Push Event */
136 AM65_CPTS_EV_RX, /* Ethernet Receive Event */
137 AM65_CPTS_EV_TX, /* Ethernet Transmit Event */
138 AM65_CPTS_EV_TS_COMP, /* Time Stamp Compare Event */
139 AM65_CPTS_EV_HOST, /* Host Transmit Event */
140};
141
142struct am65_cpts_event {
143 struct list_head list;
144 unsigned long tmo;
145 u32 event1;
146 u32 event2;
147 u64 timestamp;
148};
149
150#define AM65_CPTS_FIFO_DEPTH (16)
151#define AM65_CPTS_MAX_EVENTS (32)
152#define AM65_CPTS_EVENT_RX_TX_TIMEOUT (20) /* ms */
153#define AM65_CPTS_SKB_TX_WORK_TIMEOUT 1 /* jiffies */
154#define AM65_CPTS_MIN_PPM 0x400
155
156struct am65_cpts {
157 struct device *dev;
158 struct am65_cpts_regs __iomem *reg;
159 struct ptp_clock_info ptp_info;
160 struct ptp_clock *ptp_clock;
161 int phc_index;
162 struct clk_hw *clk_mux_hw;
163 struct device_node *clk_mux_np;
164 struct clk *refclk;
165 u32 refclk_freq;
166 struct list_head events;
167 struct list_head pool;
168 struct am65_cpts_event pool_data[AM65_CPTS_MAX_EVENTS];
169 spinlock_t lock; /* protects events lists*/
170 u32 ext_ts_inputs;
171 u32 genf_num;
172 u32 ts_add_val;
173 int irq;
174 struct mutex ptp_clk_lock; /* PHC access sync */
175 u64 timestamp;
176 u32 genf_enable;
177 u32 hw_ts_enable;
178 u32 estf_enable;
179 struct sk_buff_head txq;
180 bool pps_enabled;
181 bool pps_present;
182 u32 pps_hw_ts_idx;
183 u32 pps_genf_idx;
184 /* context save/restore */
185 u64 sr_cpts_ns;
186 u64 sr_ktime_ns;
187 u32 sr_control;
188 u32 sr_int_enable;
189 u32 sr_rftclk_sel;
190 u32 sr_ts_ppm_hi;
191 u32 sr_ts_ppm_low;
192 struct am65_genf_regs sr_genf[AM65_CPTS_GENF_MAX_NUM];
193 struct am65_genf_regs sr_estf[AM65_CPTS_ESTF_MAX_NUM];
194};
195
196struct am65_cpts_skb_cb_data {
197 unsigned long tmo;
198 u32 skb_mtype_seqid;
199};
200
201#define am65_cpts_write32(c, v, r) writel(v, &(c)->reg->r)
202#define am65_cpts_read32(c, r) readl(&(c)->reg->r)
203
204static void am65_cpts_settime(struct am65_cpts *cpts, u64 start_tstamp)
205{
206 u32 val;
207
208 val = upper_32_bits(start_tstamp);
209 am65_cpts_write32(cpts, val, ts_load_val_hi);
210 val = lower_32_bits(start_tstamp);
211 am65_cpts_write32(cpts, val, ts_load_val_lo);
212
213 am65_cpts_write32(cpts, AM65_CPTS_TS_LOAD_EN, ts_load_en);
214}
215
216static void am65_cpts_set_add_val(struct am65_cpts *cpts)
217{
218 /* select coefficient according to the rate */
219 cpts->ts_add_val = (NSEC_PER_SEC / cpts->refclk_freq - 1) & 0x7;
220
221 am65_cpts_write32(cpts, cpts->ts_add_val, ts_add_val);
222}
223
224static void am65_cpts_disable(struct am65_cpts *cpts)
225{
226 am65_cpts_write32(cpts, 0, control);
227 am65_cpts_write32(cpts, 0, int_enable);
228}
229
230static int am65_cpts_event_get_port(struct am65_cpts_event *event)
231{
232 return (event->event1 & AM65_CPTS_EVENT_1_PORT_NUMBER_MASK) >>
233 AM65_CPTS_EVENT_1_PORT_NUMBER_SHIFT;
234}
235
236static int am65_cpts_event_get_type(struct am65_cpts_event *event)
237{
238 return (event->event1 & AM65_CPTS_EVENT_1_EVENT_TYPE_MASK) >>
239 AM65_CPTS_EVENT_1_EVENT_TYPE_SHIFT;
240}
241
242static int am65_cpts_cpts_purge_events(struct am65_cpts *cpts)
243{
244 struct list_head *this, *next;
245 struct am65_cpts_event *event;
246 int removed = 0;
247
248 list_for_each_safe(this, next, &cpts->events) {
249 event = list_entry(this, struct am65_cpts_event, list);
250 if (time_after(jiffies, event->tmo)) {
251 list_del_init(&event->list);
252 list_add(&event->list, &cpts->pool);
253 ++removed;
254 }
255 }
256
257 if (removed)
258 dev_dbg(cpts->dev, "event pool cleaned up %d\n", removed);
259 return removed ? 0 : -1;
260}
261
262static bool am65_cpts_fifo_pop_event(struct am65_cpts *cpts,
263 struct am65_cpts_event *event)
264{
265 u32 r = am65_cpts_read32(cpts, intstat_raw);
266
267 if (r & AM65_CPTS_INTSTAT_RAW_TS_PEND) {
268 event->timestamp = am65_cpts_read32(cpts, event_0);
269 event->event1 = am65_cpts_read32(cpts, event_1);
270 event->event2 = am65_cpts_read32(cpts, event_2);
271 event->timestamp |= (u64)am65_cpts_read32(cpts, event_3) << 32;
272 am65_cpts_write32(cpts, AM65_CPTS_EVENT_POP, event_pop);
273 return false;
274 }
275 return true;
276}
277
278static int __am65_cpts_fifo_read(struct am65_cpts *cpts)
279{
280 struct ptp_clock_event pevent;
281 struct am65_cpts_event *event;
282 bool schedule = false;
283 int i, type, ret = 0;
284
285 for (i = 0; i < AM65_CPTS_FIFO_DEPTH; i++) {
286 event = list_first_entry_or_null(&cpts->pool,
287 struct am65_cpts_event, list);
288
289 if (!event) {
290 if (am65_cpts_cpts_purge_events(cpts)) {
291 dev_err(cpts->dev, "cpts: event pool empty\n");
292 ret = -1;
293 goto out;
294 }
295 continue;
296 }
297
298 if (am65_cpts_fifo_pop_event(cpts, event))
299 break;
300
301 type = am65_cpts_event_get_type(event);
302 switch (type) {
303 case AM65_CPTS_EV_PUSH:
304 cpts->timestamp = event->timestamp;
305 dev_dbg(cpts->dev, "AM65_CPTS_EV_PUSH t:%llu\n",
306 cpts->timestamp);
307 break;
308 case AM65_CPTS_EV_RX:
309 case AM65_CPTS_EV_TX:
310 event->tmo = jiffies +
311 msecs_to_jiffies(AM65_CPTS_EVENT_RX_TX_TIMEOUT);
312
313 list_move_tail(&event->list, &cpts->events);
314
315 dev_dbg(cpts->dev,
316 "AM65_CPTS_EV_TX e1:%08x e2:%08x t:%lld\n",
317 event->event1, event->event2,
318 event->timestamp);
319 schedule = true;
320 break;
321 case AM65_CPTS_EV_HW:
322 pevent.index = am65_cpts_event_get_port(event) - 1;
323 pevent.timestamp = event->timestamp;
324 if (cpts->pps_enabled && pevent.index == cpts->pps_hw_ts_idx) {
325 pevent.type = PTP_CLOCK_PPSUSR;
326 pevent.pps_times.ts_real = ns_to_timespec64(pevent.timestamp);
327 } else {
328 pevent.type = PTP_CLOCK_EXTTS;
329 }
330 dev_dbg(cpts->dev, "AM65_CPTS_EV_HW:%s p:%d t:%llu\n",
331 pevent.type == PTP_CLOCK_EXTTS ?
332 "extts" : "pps",
333 pevent.index, event->timestamp);
334
335 ptp_clock_event(cpts->ptp_clock, &pevent);
336 break;
337 case AM65_CPTS_EV_HOST:
338 break;
339 case AM65_CPTS_EV_ROLL:
340 case AM65_CPTS_EV_HALF:
341 case AM65_CPTS_EV_TS_COMP:
342 dev_dbg(cpts->dev,
343 "AM65_CPTS_EVT: %d e1:%08x e2:%08x t:%lld\n",
344 type,
345 event->event1, event->event2,
346 event->timestamp);
347 break;
348 default:
349 dev_err(cpts->dev, "cpts: unknown event type\n");
350 ret = -1;
351 goto out;
352 }
353 }
354
355out:
356 if (schedule)
357 ptp_schedule_worker(cpts->ptp_clock, 0);
358
359 return ret;
360}
361
362static int am65_cpts_fifo_read(struct am65_cpts *cpts)
363{
364 unsigned long flags;
365 int ret = 0;
366
367 spin_lock_irqsave(&cpts->lock, flags);
368 ret = __am65_cpts_fifo_read(cpts);
369 spin_unlock_irqrestore(&cpts->lock, flags);
370
371 return ret;
372}
373
374static u64 am65_cpts_gettime(struct am65_cpts *cpts,
375 struct ptp_system_timestamp *sts)
376{
377 unsigned long flags;
378 u64 val = 0;
379
380 /* temporarily disable cpts interrupt to avoid intentional
381 * doubled read. Interrupt can be in-flight - it's Ok.
382 */
383 am65_cpts_write32(cpts, 0, int_enable);
384
385 /* use spin_lock_irqsave() here as it has to run very fast */
386 spin_lock_irqsave(&cpts->lock, flags);
387 ptp_read_system_prets(sts);
388 am65_cpts_write32(cpts, AM65_CPTS_TS_PUSH, ts_push);
389 am65_cpts_read32(cpts, ts_push);
390 ptp_read_system_postts(sts);
391 spin_unlock_irqrestore(&cpts->lock, flags);
392
393 am65_cpts_fifo_read(cpts);
394
395 am65_cpts_write32(cpts, AM65_CPTS_INT_ENABLE_TS_PEND_EN, int_enable);
396
397 val = cpts->timestamp;
398
399 return val;
400}
401
402static irqreturn_t am65_cpts_interrupt(int irq, void *dev_id)
403{
404 struct am65_cpts *cpts = dev_id;
405
406 if (am65_cpts_fifo_read(cpts))
407 dev_dbg(cpts->dev, "cpts: unable to obtain a time stamp\n");
408
409 return IRQ_HANDLED;
410}
411
412/* PTP clock operations */
413static int am65_cpts_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
414{
415 struct am65_cpts *cpts = container_of(ptp, struct am65_cpts, ptp_info);
416 u32 estf_ctrl_val = 0, estf_ppm_hi = 0, estf_ppm_low = 0;
417 s32 ppb = scaled_ppm_to_ppb(scaled_ppm);
418 int pps_index = cpts->pps_genf_idx;
419 u64 adj_period, pps_adj_period;
420 u32 ctrl_val, ppm_hi, ppm_low;
421 unsigned long flags;
422 int neg_adj = 0, i;
423
424 if (ppb < 0) {
425 neg_adj = 1;
426 ppb = -ppb;
427 }
428
429 /* base freq = 1GHz = 1 000 000 000
430 * ppb_norm = ppb * base_freq / clock_freq;
431 * ppm_norm = ppb_norm / 1000
432 * adj_period = 1 000 000 / ppm_norm
433 * adj_period = 1 000 000 000 / ppb_norm
434 * adj_period = 1 000 000 000 / (ppb * base_freq / clock_freq)
435 * adj_period = (1 000 000 000 * clock_freq) / (ppb * base_freq)
436 * adj_period = clock_freq / ppb
437 */
438 adj_period = div_u64(cpts->refclk_freq, ppb);
439
440 mutex_lock(&cpts->ptp_clk_lock);
441
442 ctrl_val = am65_cpts_read32(cpts, control);
443 if (neg_adj)
444 ctrl_val |= AM65_CPTS_CONTROL_TS_PPM_DIR;
445 else
446 ctrl_val &= ~AM65_CPTS_CONTROL_TS_PPM_DIR;
447
448 ppm_hi = upper_32_bits(adj_period) & 0x3FF;
449 ppm_low = lower_32_bits(adj_period);
450
451 if (cpts->pps_enabled) {
452 estf_ctrl_val = am65_cpts_read32(cpts, genf[pps_index].control);
453 if (neg_adj)
454 estf_ctrl_val &= ~BIT(1);
455 else
456 estf_ctrl_val |= BIT(1);
457
458 /* GenF PPM will do correction using cpts refclk tick which is
459 * (cpts->ts_add_val + 1) ns, so GenF length PPM adj period
460 * need to be corrected.
461 */
462 pps_adj_period = adj_period * (cpts->ts_add_val + 1);
463 estf_ppm_hi = upper_32_bits(pps_adj_period) & 0x3FF;
464 estf_ppm_low = lower_32_bits(pps_adj_period);
465 }
466
467 spin_lock_irqsave(&cpts->lock, flags);
468
469 /* All below writes must be done extremely fast:
470 * - delay between PPM dir and PPM value changes can cause err due old
471 * PPM correction applied in wrong direction
472 * - delay between CPTS-clock PPM cfg and GenF PPM cfg can cause err
473 * due CPTS-clock PPM working with new cfg while GenF PPM cfg still
474 * with old for short period of time
475 */
476
477 am65_cpts_write32(cpts, ctrl_val, control);
478 am65_cpts_write32(cpts, ppm_hi, ts_ppm_hi);
479 am65_cpts_write32(cpts, ppm_low, ts_ppm_low);
480
481 if (cpts->pps_enabled) {
482 am65_cpts_write32(cpts, estf_ctrl_val, genf[pps_index].control);
483 am65_cpts_write32(cpts, estf_ppm_hi, genf[pps_index].ppm_hi);
484 am65_cpts_write32(cpts, estf_ppm_low, genf[pps_index].ppm_low);
485 }
486
487 for (i = 0; i < AM65_CPTS_ESTF_MAX_NUM; i++) {
488 if (cpts->estf_enable & BIT(i)) {
489 am65_cpts_write32(cpts, estf_ctrl_val, estf[i].control);
490 am65_cpts_write32(cpts, estf_ppm_hi, estf[i].ppm_hi);
491 am65_cpts_write32(cpts, estf_ppm_low, estf[i].ppm_low);
492 }
493 }
494 /* All GenF/EstF can be updated here the same way */
495 spin_unlock_irqrestore(&cpts->lock, flags);
496
497 mutex_unlock(&cpts->ptp_clk_lock);
498
499 return 0;
500}
501
502static int am65_cpts_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
503{
504 struct am65_cpts *cpts = container_of(ptp, struct am65_cpts, ptp_info);
505 s64 ns;
506
507 mutex_lock(&cpts->ptp_clk_lock);
508 ns = am65_cpts_gettime(cpts, NULL);
509 ns += delta;
510 am65_cpts_settime(cpts, ns);
511 mutex_unlock(&cpts->ptp_clk_lock);
512
513 return 0;
514}
515
516static int am65_cpts_ptp_gettimex(struct ptp_clock_info *ptp,
517 struct timespec64 *ts,
518 struct ptp_system_timestamp *sts)
519{
520 struct am65_cpts *cpts = container_of(ptp, struct am65_cpts, ptp_info);
521 u64 ns;
522
523 mutex_lock(&cpts->ptp_clk_lock);
524 ns = am65_cpts_gettime(cpts, sts);
525 mutex_unlock(&cpts->ptp_clk_lock);
526 *ts = ns_to_timespec64(ns);
527
528 return 0;
529}
530
531u64 am65_cpts_ns_gettime(struct am65_cpts *cpts)
532{
533 u64 ns;
534
535 /* reuse ptp_clk_lock as it serialize ts push */
536 mutex_lock(&cpts->ptp_clk_lock);
537 ns = am65_cpts_gettime(cpts, NULL);
538 mutex_unlock(&cpts->ptp_clk_lock);
539
540 return ns;
541}
542EXPORT_SYMBOL_GPL(am65_cpts_ns_gettime);
543
544static int am65_cpts_ptp_settime(struct ptp_clock_info *ptp,
545 const struct timespec64 *ts)
546{
547 struct am65_cpts *cpts = container_of(ptp, struct am65_cpts, ptp_info);
548 u64 ns;
549
550 ns = timespec64_to_ns(ts);
551 mutex_lock(&cpts->ptp_clk_lock);
552 am65_cpts_settime(cpts, ns);
553 mutex_unlock(&cpts->ptp_clk_lock);
554
555 return 0;
556}
557
558static void am65_cpts_extts_enable_hw(struct am65_cpts *cpts, u32 index, int on)
559{
560 u32 v;
561
562 v = am65_cpts_read32(cpts, control);
563 if (on) {
564 v |= BIT(AM65_CPTS_CONTROL_HW1_TS_PUSH_OFFSET + index);
565 cpts->hw_ts_enable |= BIT(index);
566 } else {
567 v &= ~BIT(AM65_CPTS_CONTROL_HW1_TS_PUSH_OFFSET + index);
568 cpts->hw_ts_enable &= ~BIT(index);
569 }
570 am65_cpts_write32(cpts, v, control);
571}
572
573static int am65_cpts_extts_enable(struct am65_cpts *cpts, u32 index, int on)
574{
575 if (index >= cpts->ptp_info.n_ext_ts)
576 return -ENXIO;
577
578 if (cpts->pps_present && index == cpts->pps_hw_ts_idx)
579 return -EINVAL;
580
581 if (((cpts->hw_ts_enable & BIT(index)) >> index) == on)
582 return 0;
583
584 mutex_lock(&cpts->ptp_clk_lock);
585 am65_cpts_extts_enable_hw(cpts, index, on);
586 mutex_unlock(&cpts->ptp_clk_lock);
587
588 dev_dbg(cpts->dev, "%s: ExtTS:%u %s\n",
589 __func__, index, on ? "enabled" : "disabled");
590
591 return 0;
592}
593
594int am65_cpts_estf_enable(struct am65_cpts *cpts, int idx,
595 struct am65_cpts_estf_cfg *cfg)
596{
597 u64 cycles;
598 u32 val;
599
600 cycles = cfg->ns_period * cpts->refclk_freq;
601 cycles = DIV_ROUND_UP(cycles, NSEC_PER_SEC);
602 if (cycles > U32_MAX)
603 return -EINVAL;
604
605 /* according to TRM should be zeroed */
606 am65_cpts_write32(cpts, 0, estf[idx].length);
607
608 val = upper_32_bits(cfg->ns_start);
609 am65_cpts_write32(cpts, val, estf[idx].comp_hi);
610 val = lower_32_bits(cfg->ns_start);
611 am65_cpts_write32(cpts, val, estf[idx].comp_lo);
612 val = lower_32_bits(cycles);
613 am65_cpts_write32(cpts, val, estf[idx].length);
614 am65_cpts_write32(cpts, 0, estf[idx].control);
615 am65_cpts_write32(cpts, 0, estf[idx].ppm_hi);
616 am65_cpts_write32(cpts, 0, estf[idx].ppm_low);
617
618 cpts->estf_enable |= BIT(idx);
619
620 dev_dbg(cpts->dev, "%s: ESTF:%u enabled\n", __func__, idx);
621
622 return 0;
623}
624EXPORT_SYMBOL_GPL(am65_cpts_estf_enable);
625
626void am65_cpts_estf_disable(struct am65_cpts *cpts, int idx)
627{
628 am65_cpts_write32(cpts, 0, estf[idx].length);
629 cpts->estf_enable &= ~BIT(idx);
630
631 dev_dbg(cpts->dev, "%s: ESTF:%u disabled\n", __func__, idx);
632}
633EXPORT_SYMBOL_GPL(am65_cpts_estf_disable);
634
635static void am65_cpts_perout_enable_hw(struct am65_cpts *cpts,
636 struct ptp_perout_request *req, int on)
637{
638 u64 ns_period, ns_start, cycles;
639 struct timespec64 ts;
640 u32 val;
641
642 if (on) {
643 ts.tv_sec = req->period.sec;
644 ts.tv_nsec = req->period.nsec;
645 ns_period = timespec64_to_ns(&ts);
646
647 cycles = (ns_period * cpts->refclk_freq) / NSEC_PER_SEC;
648
649 ts.tv_sec = req->start.sec;
650 ts.tv_nsec = req->start.nsec;
651 ns_start = timespec64_to_ns(&ts);
652
653 val = upper_32_bits(ns_start);
654 am65_cpts_write32(cpts, val, genf[req->index].comp_hi);
655 val = lower_32_bits(ns_start);
656 am65_cpts_write32(cpts, val, genf[req->index].comp_lo);
657 val = lower_32_bits(cycles);
658 am65_cpts_write32(cpts, val, genf[req->index].length);
659
660 am65_cpts_write32(cpts, 0, genf[req->index].control);
661 am65_cpts_write32(cpts, 0, genf[req->index].ppm_hi);
662 am65_cpts_write32(cpts, 0, genf[req->index].ppm_low);
663
664 cpts->genf_enable |= BIT(req->index);
665 } else {
666 am65_cpts_write32(cpts, 0, genf[req->index].length);
667
668 cpts->genf_enable &= ~BIT(req->index);
669 }
670}
671
672static int am65_cpts_perout_enable(struct am65_cpts *cpts,
673 struct ptp_perout_request *req, int on)
674{
675 if (req->index >= cpts->ptp_info.n_per_out)
676 return -ENXIO;
677
678 if (cpts->pps_present && req->index == cpts->pps_genf_idx)
679 return -EINVAL;
680
681 if (!!(cpts->genf_enable & BIT(req->index)) == !!on)
682 return 0;
683
684 mutex_lock(&cpts->ptp_clk_lock);
685 am65_cpts_perout_enable_hw(cpts, req, on);
686 mutex_unlock(&cpts->ptp_clk_lock);
687
688 dev_dbg(cpts->dev, "%s: GenF:%u %s\n",
689 __func__, req->index, on ? "enabled" : "disabled");
690
691 return 0;
692}
693
694static int am65_cpts_pps_enable(struct am65_cpts *cpts, int on)
695{
696 int ret = 0;
697 struct timespec64 ts;
698 struct ptp_clock_request rq;
699 u64 ns;
700
701 if (!cpts->pps_present)
702 return -EINVAL;
703
704 if (cpts->pps_enabled == !!on)
705 return 0;
706
707 mutex_lock(&cpts->ptp_clk_lock);
708
709 if (on) {
710 am65_cpts_extts_enable_hw(cpts, cpts->pps_hw_ts_idx, on);
711
712 ns = am65_cpts_gettime(cpts, NULL);
713 ts = ns_to_timespec64(ns);
714 rq.perout.period.sec = 1;
715 rq.perout.period.nsec = 0;
716 rq.perout.start.sec = ts.tv_sec + 2;
717 rq.perout.start.nsec = 0;
718 rq.perout.index = cpts->pps_genf_idx;
719
720 am65_cpts_perout_enable_hw(cpts, &rq.perout, on);
721 cpts->pps_enabled = true;
722 } else {
723 rq.perout.index = cpts->pps_genf_idx;
724 am65_cpts_perout_enable_hw(cpts, &rq.perout, on);
725 am65_cpts_extts_enable_hw(cpts, cpts->pps_hw_ts_idx, on);
726 cpts->pps_enabled = false;
727 }
728
729 mutex_unlock(&cpts->ptp_clk_lock);
730
731 dev_dbg(cpts->dev, "%s: pps: %s\n",
732 __func__, on ? "enabled" : "disabled");
733 return ret;
734}
735
736static int am65_cpts_ptp_enable(struct ptp_clock_info *ptp,
737 struct ptp_clock_request *rq, int on)
738{
739 struct am65_cpts *cpts = container_of(ptp, struct am65_cpts, ptp_info);
740
741 switch (rq->type) {
742 case PTP_CLK_REQ_EXTTS:
743 return am65_cpts_extts_enable(cpts, rq->extts.index, on);
744 case PTP_CLK_REQ_PEROUT:
745 return am65_cpts_perout_enable(cpts, &rq->perout, on);
746 case PTP_CLK_REQ_PPS:
747 return am65_cpts_pps_enable(cpts, on);
748 default:
749 break;
750 }
751
752 return -EOPNOTSUPP;
753}
754
755static long am65_cpts_ts_work(struct ptp_clock_info *ptp);
756
757static struct ptp_clock_info am65_ptp_info = {
758 .owner = THIS_MODULE,
759 .name = "CTPS timer",
760 .adjfine = am65_cpts_ptp_adjfine,
761 .adjtime = am65_cpts_ptp_adjtime,
762 .gettimex64 = am65_cpts_ptp_gettimex,
763 .settime64 = am65_cpts_ptp_settime,
764 .enable = am65_cpts_ptp_enable,
765 .do_aux_work = am65_cpts_ts_work,
766};
767
768static bool am65_cpts_match_tx_ts(struct am65_cpts *cpts,
769 struct am65_cpts_event *event)
770{
771 struct sk_buff_head txq_list;
772 struct sk_buff *skb, *tmp;
773 unsigned long flags;
774 bool found = false;
775 u32 mtype_seqid;
776
777 mtype_seqid = event->event1 &
778 (AM65_CPTS_EVENT_1_MESSAGE_TYPE_MASK |
779 AM65_CPTS_EVENT_1_EVENT_TYPE_MASK |
780 AM65_CPTS_EVENT_1_SEQUENCE_ID_MASK);
781
782 __skb_queue_head_init(&txq_list);
783
784 spin_lock_irqsave(&cpts->txq.lock, flags);
785 skb_queue_splice_init(&cpts->txq, &txq_list);
786 spin_unlock_irqrestore(&cpts->txq.lock, flags);
787
788 /* no need to grab txq.lock as access is always done under cpts->lock */
789 skb_queue_walk_safe(&txq_list, skb, tmp) {
790 struct skb_shared_hwtstamps ssh;
791 struct am65_cpts_skb_cb_data *skb_cb =
792 (struct am65_cpts_skb_cb_data *)skb->cb;
793
794 if ((ptp_classify_raw(skb) & PTP_CLASS_V1) &&
795 ((mtype_seqid & AM65_CPTS_EVENT_1_SEQUENCE_ID_MASK) ==
796 (skb_cb->skb_mtype_seqid & AM65_CPTS_EVENT_1_SEQUENCE_ID_MASK)))
797 mtype_seqid = skb_cb->skb_mtype_seqid;
798
799 if (mtype_seqid == skb_cb->skb_mtype_seqid) {
800 u64 ns = event->timestamp;
801
802 memset(&ssh, 0, sizeof(ssh));
803 ssh.hwtstamp = ns_to_ktime(ns);
804 skb_tstamp_tx(skb, &ssh);
805 found = true;
806 __skb_unlink(skb, &txq_list);
807 dev_consume_skb_any(skb);
808 dev_dbg(cpts->dev,
809 "match tx timestamp mtype_seqid %08x\n",
810 mtype_seqid);
811 break;
812 }
813
814 if (time_after(jiffies, skb_cb->tmo)) {
815 /* timeout any expired skbs over 100 ms */
816 dev_dbg(cpts->dev,
817 "expiring tx timestamp mtype_seqid %08x\n",
818 mtype_seqid);
819 __skb_unlink(skb, &txq_list);
820 dev_consume_skb_any(skb);
821 }
822 }
823
824 spin_lock_irqsave(&cpts->txq.lock, flags);
825 skb_queue_splice(&txq_list, &cpts->txq);
826 spin_unlock_irqrestore(&cpts->txq.lock, flags);
827
828 return found;
829}
830
831static void am65_cpts_find_ts(struct am65_cpts *cpts)
832{
833 struct am65_cpts_event *event;
834 struct list_head *this, *next;
835 LIST_HEAD(events_free);
836 unsigned long flags;
837 LIST_HEAD(events);
838
839 spin_lock_irqsave(&cpts->lock, flags);
840 list_splice_init(&cpts->events, &events);
841 spin_unlock_irqrestore(&cpts->lock, flags);
842
843 list_for_each_safe(this, next, &events) {
844 event = list_entry(this, struct am65_cpts_event, list);
845 if (am65_cpts_match_tx_ts(cpts, event) ||
846 time_after(jiffies, event->tmo)) {
847 list_del_init(&event->list);
848 list_add(&event->list, &events_free);
849 }
850 }
851
852 spin_lock_irqsave(&cpts->lock, flags);
853 list_splice_tail(&events, &cpts->events);
854 list_splice_tail(&events_free, &cpts->pool);
855 spin_unlock_irqrestore(&cpts->lock, flags);
856}
857
858static long am65_cpts_ts_work(struct ptp_clock_info *ptp)
859{
860 struct am65_cpts *cpts = container_of(ptp, struct am65_cpts, ptp_info);
861 unsigned long flags;
862 long delay = -1;
863
864 am65_cpts_find_ts(cpts);
865
866 spin_lock_irqsave(&cpts->txq.lock, flags);
867 if (!skb_queue_empty(&cpts->txq))
868 delay = AM65_CPTS_SKB_TX_WORK_TIMEOUT;
869 spin_unlock_irqrestore(&cpts->txq.lock, flags);
870
871 return delay;
872}
873
874static int am65_skb_get_mtype_seqid(struct sk_buff *skb, u32 *mtype_seqid)
875{
876 unsigned int ptp_class = ptp_classify_raw(skb);
877 struct ptp_header *hdr;
878 u8 msgtype;
879 u16 seqid;
880
881 if (ptp_class == PTP_CLASS_NONE)
882 return 0;
883
884 hdr = ptp_parse_header(skb, ptp_class);
885 if (!hdr)
886 return 0;
887
888 msgtype = ptp_get_msgtype(hdr, ptp_class);
889 seqid = ntohs(hdr->sequence_id);
890
891 *mtype_seqid = (msgtype << AM65_CPTS_EVENT_1_MESSAGE_TYPE_SHIFT) &
892 AM65_CPTS_EVENT_1_MESSAGE_TYPE_MASK;
893 *mtype_seqid |= (seqid & AM65_CPTS_EVENT_1_SEQUENCE_ID_MASK);
894
895 return 1;
896}
897
898static u64 am65_cpts_find_rx_ts(struct am65_cpts *cpts, u32 skb_mtype_seqid)
899{
900 struct list_head *this, *next;
901 struct am65_cpts_event *event;
902 unsigned long flags;
903 u32 mtype_seqid;
904 u64 ns = 0;
905
906 spin_lock_irqsave(&cpts->lock, flags);
907 __am65_cpts_fifo_read(cpts);
908 list_for_each_safe(this, next, &cpts->events) {
909 event = list_entry(this, struct am65_cpts_event, list);
910 if (time_after(jiffies, event->tmo)) {
911 list_move(&event->list, &cpts->pool);
912 continue;
913 }
914
915 mtype_seqid = event->event1 &
916 (AM65_CPTS_EVENT_1_MESSAGE_TYPE_MASK |
917 AM65_CPTS_EVENT_1_SEQUENCE_ID_MASK |
918 AM65_CPTS_EVENT_1_EVENT_TYPE_MASK);
919
920 if (mtype_seqid == skb_mtype_seqid) {
921 ns = event->timestamp;
922 list_move(&event->list, &cpts->pool);
923 break;
924 }
925 }
926 spin_unlock_irqrestore(&cpts->lock, flags);
927
928 return ns;
929}
930
931void am65_cpts_rx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb)
932{
933 struct am65_cpts_skb_cb_data *skb_cb = (struct am65_cpts_skb_cb_data *)skb->cb;
934 struct skb_shared_hwtstamps *ssh;
935 int ret;
936 u64 ns;
937
938 /* am65_cpts_rx_timestamp() is called before eth_type_trans(), so
939 * skb MAC Hdr properties are not configured yet. Hence need to
940 * reset skb MAC header here
941 */
942 skb_reset_mac_header(skb);
943 ret = am65_skb_get_mtype_seqid(skb, &skb_cb->skb_mtype_seqid);
944 if (!ret)
945 return; /* if not PTP class packet */
946
947 skb_cb->skb_mtype_seqid |= (AM65_CPTS_EV_RX << AM65_CPTS_EVENT_1_EVENT_TYPE_SHIFT);
948
949 dev_dbg(cpts->dev, "%s mtype seqid %08x\n", __func__, skb_cb->skb_mtype_seqid);
950
951 ns = am65_cpts_find_rx_ts(cpts, skb_cb->skb_mtype_seqid);
952 if (!ns)
953 return;
954
955 ssh = skb_hwtstamps(skb);
956 memset(ssh, 0, sizeof(*ssh));
957 ssh->hwtstamp = ns_to_ktime(ns);
958}
959EXPORT_SYMBOL_GPL(am65_cpts_rx_timestamp);
960
961/**
962 * am65_cpts_tx_timestamp - save tx packet for timestamping
963 * @cpts: cpts handle
964 * @skb: packet
965 *
966 * This functions saves tx packet for timestamping if packet can be timestamped.
967 * The future processing is done in from PTP auxiliary worker.
968 */
969void am65_cpts_tx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb)
970{
971 struct am65_cpts_skb_cb_data *skb_cb = (void *)skb->cb;
972
973 if (!(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
974 return;
975
976 /* add frame to queue for processing later.
977 * The periodic FIFO check will handle this.
978 */
979 skb_get(skb);
980 /* get the timestamp for timeouts */
981 skb_cb->tmo = jiffies + msecs_to_jiffies(100);
982 skb_queue_tail(&cpts->txq, skb);
983 ptp_schedule_worker(cpts->ptp_clock, 0);
984}
985EXPORT_SYMBOL_GPL(am65_cpts_tx_timestamp);
986
987/**
988 * am65_cpts_prep_tx_timestamp - check and prepare tx packet for timestamping
989 * @cpts: cpts handle
990 * @skb: packet
991 *
992 * This functions should be called from .xmit().
993 * It checks if packet can be timestamped, fills internal cpts data
994 * in skb-cb and marks packet as SKBTX_IN_PROGRESS.
995 */
996void am65_cpts_prep_tx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb)
997{
998 struct am65_cpts_skb_cb_data *skb_cb = (void *)skb->cb;
999 int ret;
1000
1001 if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
1002 return;
1003
1004 ret = am65_skb_get_mtype_seqid(skb, &skb_cb->skb_mtype_seqid);
1005 if (!ret)
1006 return;
1007 skb_cb->skb_mtype_seqid |= (AM65_CPTS_EV_TX <<
1008 AM65_CPTS_EVENT_1_EVENT_TYPE_SHIFT);
1009
1010 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
1011}
1012EXPORT_SYMBOL_GPL(am65_cpts_prep_tx_timestamp);
1013
1014int am65_cpts_phc_index(struct am65_cpts *cpts)
1015{
1016 return cpts->phc_index;
1017}
1018EXPORT_SYMBOL_GPL(am65_cpts_phc_index);
1019
1020static void cpts_free_clk_mux(void *data)
1021{
1022 struct am65_cpts *cpts = data;
1023
1024 of_clk_del_provider(cpts->clk_mux_np);
1025 clk_hw_unregister_mux(cpts->clk_mux_hw);
1026 of_node_put(cpts->clk_mux_np);
1027}
1028
1029static int cpts_of_mux_clk_setup(struct am65_cpts *cpts,
1030 struct device_node *node)
1031{
1032 unsigned int num_parents;
1033 const char **parent_names;
1034 char *clk_mux_name;
1035 void __iomem *reg;
1036 int ret = -EINVAL;
1037
1038 cpts->clk_mux_np = of_get_child_by_name(node, "refclk-mux");
1039 if (!cpts->clk_mux_np)
1040 return 0;
1041
1042 num_parents = of_clk_get_parent_count(cpts->clk_mux_np);
1043 if (num_parents < 1) {
1044 dev_err(cpts->dev, "mux-clock %pOF must have parents\n",
1045 cpts->clk_mux_np);
1046 goto mux_fail;
1047 }
1048
1049 parent_names = devm_kcalloc(cpts->dev, sizeof(char *), num_parents,
1050 GFP_KERNEL);
1051 if (!parent_names) {
1052 ret = -ENOMEM;
1053 goto mux_fail;
1054 }
1055
1056 of_clk_parent_fill(cpts->clk_mux_np, parent_names, num_parents);
1057
1058 clk_mux_name = devm_kasprintf(cpts->dev, GFP_KERNEL, "%s.%pOFn",
1059 dev_name(cpts->dev), cpts->clk_mux_np);
1060 if (!clk_mux_name) {
1061 ret = -ENOMEM;
1062 goto mux_fail;
1063 }
1064
1065 reg = &cpts->reg->rftclk_sel;
1066 /* dev must be NULL to avoid recursive incrementing
1067 * of module refcnt
1068 */
1069 cpts->clk_mux_hw = clk_hw_register_mux(NULL, clk_mux_name,
1070 parent_names, num_parents,
1071 0, reg, 0, 5, 0, NULL);
1072 if (IS_ERR(cpts->clk_mux_hw)) {
1073 ret = PTR_ERR(cpts->clk_mux_hw);
1074 goto mux_fail;
1075 }
1076
1077 ret = of_clk_add_hw_provider(cpts->clk_mux_np, of_clk_hw_simple_get,
1078 cpts->clk_mux_hw);
1079 if (ret)
1080 goto clk_hw_register;
1081
1082 ret = devm_add_action_or_reset(cpts->dev, cpts_free_clk_mux, cpts);
1083 if (ret)
1084 dev_err(cpts->dev, "failed to add clkmux reset action %d", ret);
1085
1086 return ret;
1087
1088clk_hw_register:
1089 clk_hw_unregister_mux(cpts->clk_mux_hw);
1090mux_fail:
1091 of_node_put(cpts->clk_mux_np);
1092 return ret;
1093}
1094
1095static int am65_cpts_of_parse(struct am65_cpts *cpts, struct device_node *node)
1096{
1097 u32 prop[2];
1098
1099 if (!of_property_read_u32(node, "ti,cpts-ext-ts-inputs", &prop[0]))
1100 cpts->ext_ts_inputs = prop[0];
1101
1102 if (!of_property_read_u32(node, "ti,cpts-periodic-outputs", &prop[0]))
1103 cpts->genf_num = prop[0];
1104
1105 if (!of_property_read_u32_array(node, "ti,pps", prop, 2)) {
1106 cpts->pps_present = true;
1107
1108 if (prop[0] > 7) {
1109 dev_err(cpts->dev, "invalid HWx_TS_PUSH index: %u provided\n", prop[0]);
1110 cpts->pps_present = false;
1111 }
1112 if (prop[1] > 1) {
1113 dev_err(cpts->dev, "invalid GENFy index: %u provided\n", prop[1]);
1114 cpts->pps_present = false;
1115 }
1116 if (cpts->pps_present) {
1117 cpts->pps_hw_ts_idx = prop[0];
1118 cpts->pps_genf_idx = prop[1];
1119 }
1120 }
1121
1122 return cpts_of_mux_clk_setup(cpts, node);
1123}
1124
1125void am65_cpts_release(struct am65_cpts *cpts)
1126{
1127 ptp_clock_unregister(cpts->ptp_clock);
1128 am65_cpts_disable(cpts);
1129 clk_disable_unprepare(cpts->refclk);
1130}
1131EXPORT_SYMBOL_GPL(am65_cpts_release);
1132
1133struct am65_cpts *am65_cpts_create(struct device *dev, void __iomem *regs,
1134 struct device_node *node)
1135{
1136 struct am65_cpts *cpts;
1137 int ret, i;
1138
1139 cpts = devm_kzalloc(dev, sizeof(*cpts), GFP_KERNEL);
1140 if (!cpts)
1141 return ERR_PTR(-ENOMEM);
1142
1143 cpts->dev = dev;
1144 cpts->reg = (struct am65_cpts_regs __iomem *)regs;
1145
1146 cpts->irq = of_irq_get_byname(node, "cpts");
1147 if (cpts->irq <= 0) {
1148 ret = cpts->irq ?: -ENXIO;
1149 dev_err_probe(dev, ret, "Failed to get IRQ number\n");
1150 return ERR_PTR(ret);
1151 }
1152
1153 ret = am65_cpts_of_parse(cpts, node);
1154 if (ret)
1155 return ERR_PTR(ret);
1156
1157 mutex_init(&cpts->ptp_clk_lock);
1158 INIT_LIST_HEAD(&cpts->events);
1159 INIT_LIST_HEAD(&cpts->pool);
1160 spin_lock_init(&cpts->lock);
1161 skb_queue_head_init(&cpts->txq);
1162
1163 for (i = 0; i < AM65_CPTS_MAX_EVENTS; i++)
1164 list_add(&cpts->pool_data[i].list, &cpts->pool);
1165
1166 cpts->refclk = devm_get_clk_from_child(dev, node, "cpts");
1167 if (IS_ERR(cpts->refclk)) {
1168 ret = PTR_ERR(cpts->refclk);
1169 dev_err_probe(dev, ret, "Failed to get refclk\n");
1170 return ERR_PTR(ret);
1171 }
1172
1173 ret = clk_prepare_enable(cpts->refclk);
1174 if (ret) {
1175 dev_err(dev, "Failed to enable refclk %d\n", ret);
1176 return ERR_PTR(ret);
1177 }
1178
1179 cpts->refclk_freq = clk_get_rate(cpts->refclk);
1180
1181 am65_ptp_info.max_adj = cpts->refclk_freq / AM65_CPTS_MIN_PPM;
1182 cpts->ptp_info = am65_ptp_info;
1183
1184 if (cpts->ext_ts_inputs)
1185 cpts->ptp_info.n_ext_ts = cpts->ext_ts_inputs;
1186 if (cpts->genf_num)
1187 cpts->ptp_info.n_per_out = cpts->genf_num;
1188 if (cpts->pps_present)
1189 cpts->ptp_info.pps = 1;
1190
1191 am65_cpts_set_add_val(cpts);
1192
1193 am65_cpts_write32(cpts, AM65_CPTS_CONTROL_EN |
1194 AM65_CPTS_CONTROL_64MODE |
1195 AM65_CPTS_CONTROL_TX_GENF_CLR_EN,
1196 control);
1197 am65_cpts_write32(cpts, AM65_CPTS_INT_ENABLE_TS_PEND_EN, int_enable);
1198
1199 /* set time to the current system time */
1200 am65_cpts_settime(cpts, ktime_to_ns(ktime_get_real()));
1201
1202 cpts->ptp_clock = ptp_clock_register(&cpts->ptp_info, cpts->dev);
1203 if (IS_ERR_OR_NULL(cpts->ptp_clock)) {
1204 dev_err(dev, "Failed to register ptp clk %ld\n",
1205 PTR_ERR(cpts->ptp_clock));
1206 ret = cpts->ptp_clock ? PTR_ERR(cpts->ptp_clock) : -ENODEV;
1207 goto refclk_disable;
1208 }
1209 cpts->phc_index = ptp_clock_index(cpts->ptp_clock);
1210
1211 ret = devm_request_threaded_irq(dev, cpts->irq, NULL,
1212 am65_cpts_interrupt,
1213 IRQF_ONESHOT, dev_name(dev), cpts);
1214 if (ret < 0) {
1215 dev_err(cpts->dev, "error attaching irq %d\n", ret);
1216 goto reset_ptpclk;
1217 }
1218
1219 dev_info(dev, "CPTS ver 0x%08x, freq:%u, add_val:%u pps:%d\n",
1220 am65_cpts_read32(cpts, idver),
1221 cpts->refclk_freq, cpts->ts_add_val, cpts->pps_present);
1222
1223 return cpts;
1224
1225reset_ptpclk:
1226 am65_cpts_release(cpts);
1227refclk_disable:
1228 clk_disable_unprepare(cpts->refclk);
1229 return ERR_PTR(ret);
1230}
1231EXPORT_SYMBOL_GPL(am65_cpts_create);
1232
1233void am65_cpts_suspend(struct am65_cpts *cpts)
1234{
1235 /* save state and disable CPTS */
1236 cpts->sr_control = am65_cpts_read32(cpts, control);
1237 cpts->sr_int_enable = am65_cpts_read32(cpts, int_enable);
1238 cpts->sr_rftclk_sel = am65_cpts_read32(cpts, rftclk_sel);
1239 cpts->sr_ts_ppm_hi = am65_cpts_read32(cpts, ts_ppm_hi);
1240 cpts->sr_ts_ppm_low = am65_cpts_read32(cpts, ts_ppm_low);
1241 cpts->sr_cpts_ns = am65_cpts_gettime(cpts, NULL);
1242 cpts->sr_ktime_ns = ktime_to_ns(ktime_get_real());
1243 am65_cpts_disable(cpts);
1244 clk_disable(cpts->refclk);
1245
1246 /* Save GENF state */
1247 memcpy_fromio(&cpts->sr_genf, &cpts->reg->genf, sizeof(cpts->sr_genf));
1248
1249 /* Save ESTF state */
1250 memcpy_fromio(&cpts->sr_estf, &cpts->reg->estf, sizeof(cpts->sr_estf));
1251}
1252EXPORT_SYMBOL_GPL(am65_cpts_suspend);
1253
1254void am65_cpts_resume(struct am65_cpts *cpts)
1255{
1256 int i;
1257 s64 ktime_ns;
1258
1259 /* restore state and enable CPTS */
1260 clk_enable(cpts->refclk);
1261 am65_cpts_write32(cpts, cpts->sr_rftclk_sel, rftclk_sel);
1262 am65_cpts_set_add_val(cpts);
1263 am65_cpts_write32(cpts, cpts->sr_control, control);
1264 am65_cpts_write32(cpts, cpts->sr_int_enable, int_enable);
1265
1266 /* Restore time to saved CPTS time + time in suspend/resume */
1267 ktime_ns = ktime_to_ns(ktime_get_real());
1268 ktime_ns -= cpts->sr_ktime_ns;
1269 am65_cpts_settime(cpts, cpts->sr_cpts_ns + ktime_ns);
1270
1271 /* Restore compensation (PPM) */
1272 am65_cpts_write32(cpts, cpts->sr_ts_ppm_hi, ts_ppm_hi);
1273 am65_cpts_write32(cpts, cpts->sr_ts_ppm_low, ts_ppm_low);
1274
1275 /* Restore GENF state */
1276 for (i = 0; i < AM65_CPTS_GENF_MAX_NUM; i++) {
1277 am65_cpts_write32(cpts, 0, genf[i].length); /* TRM sequence */
1278 am65_cpts_write32(cpts, cpts->sr_genf[i].comp_hi, genf[i].comp_hi);
1279 am65_cpts_write32(cpts, cpts->sr_genf[i].comp_lo, genf[i].comp_lo);
1280 am65_cpts_write32(cpts, cpts->sr_genf[i].length, genf[i].length);
1281 am65_cpts_write32(cpts, cpts->sr_genf[i].control, genf[i].control);
1282 am65_cpts_write32(cpts, cpts->sr_genf[i].ppm_hi, genf[i].ppm_hi);
1283 am65_cpts_write32(cpts, cpts->sr_genf[i].ppm_low, genf[i].ppm_low);
1284 }
1285
1286 /* Restore ESTTF state */
1287 for (i = 0; i < AM65_CPTS_ESTF_MAX_NUM; i++) {
1288 am65_cpts_write32(cpts, 0, estf[i].length); /* TRM sequence */
1289 am65_cpts_write32(cpts, cpts->sr_estf[i].comp_hi, estf[i].comp_hi);
1290 am65_cpts_write32(cpts, cpts->sr_estf[i].comp_lo, estf[i].comp_lo);
1291 am65_cpts_write32(cpts, cpts->sr_estf[i].length, estf[i].length);
1292 am65_cpts_write32(cpts, cpts->sr_estf[i].control, estf[i].control);
1293 am65_cpts_write32(cpts, cpts->sr_estf[i].ppm_hi, estf[i].ppm_hi);
1294 am65_cpts_write32(cpts, cpts->sr_estf[i].ppm_low, estf[i].ppm_low);
1295 }
1296}
1297EXPORT_SYMBOL_GPL(am65_cpts_resume);
1298
1299static int am65_cpts_probe(struct platform_device *pdev)
1300{
1301 struct device_node *node = pdev->dev.of_node;
1302 struct device *dev = &pdev->dev;
1303 struct am65_cpts *cpts;
1304 void __iomem *base;
1305
1306 base = devm_platform_ioremap_resource_byname(pdev, "cpts");
1307 if (IS_ERR(base))
1308 return PTR_ERR(base);
1309
1310 cpts = am65_cpts_create(dev, base, node);
1311 return PTR_ERR_OR_ZERO(cpts);
1312}
1313
1314static const struct of_device_id am65_cpts_of_match[] = {
1315 { .compatible = "ti,am65-cpts", },
1316 { .compatible = "ti,j721e-cpts", },
1317 {},
1318};
1319MODULE_DEVICE_TABLE(of, am65_cpts_of_match);
1320
1321static struct platform_driver am65_cpts_driver = {
1322 .probe = am65_cpts_probe,
1323 .driver = {
1324 .name = "am65-cpts",
1325 .of_match_table = am65_cpts_of_match,
1326 },
1327};
1328module_platform_driver(am65_cpts_driver);
1329
1330MODULE_LICENSE("GPL v2");
1331MODULE_AUTHOR("Grygorii Strashko <grygorii.strashko@ti.com>");
1332MODULE_DESCRIPTION("TI K3 AM65 CPTS driver");
1// SPDX-License-Identifier: GPL-2.0
2/* TI K3 AM65x Common Platform Time Sync
3 *
4 * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
5 *
6 */
7
8#include <linux/clk.h>
9#include <linux/clk-provider.h>
10#include <linux/err.h>
11#include <linux/if_vlan.h>
12#include <linux/interrupt.h>
13#include <linux/module.h>
14#include <linux/netdevice.h>
15#include <linux/net_tstamp.h>
16#include <linux/of.h>
17#include <linux/of_irq.h>
18#include <linux/platform_device.h>
19#include <linux/pm_runtime.h>
20#include <linux/ptp_classify.h>
21#include <linux/ptp_clock_kernel.h>
22
23#include "am65-cpts.h"
24
25struct am65_genf_regs {
26 u32 comp_lo; /* Comparison Low Value 0:31 */
27 u32 comp_hi; /* Comparison High Value 32:63 */
28 u32 control; /* control */
29 u32 length; /* Length */
30 u32 ppm_low; /* PPM Load Low Value 0:31 */
31 u32 ppm_hi; /* PPM Load High Value 32:63 */
32 u32 ts_nudge; /* Nudge value */
33} __aligned(32) __packed;
34
35#define AM65_CPTS_GENF_MAX_NUM 9
36#define AM65_CPTS_ESTF_MAX_NUM 8
37
38struct am65_cpts_regs {
39 u32 idver; /* Identification and version */
40 u32 control; /* Time sync control */
41 u32 rftclk_sel; /* Reference Clock Select Register */
42 u32 ts_push; /* Time stamp event push */
43 u32 ts_load_val_lo; /* Time Stamp Load Low Value 0:31 */
44 u32 ts_load_en; /* Time stamp load enable */
45 u32 ts_comp_lo; /* Time Stamp Comparison Low Value 0:31 */
46 u32 ts_comp_length; /* Time Stamp Comparison Length */
47 u32 intstat_raw; /* Time sync interrupt status raw */
48 u32 intstat_masked; /* Time sync interrupt status masked */
49 u32 int_enable; /* Time sync interrupt enable */
50 u32 ts_comp_nudge; /* Time Stamp Comparison Nudge Value */
51 u32 event_pop; /* Event interrupt pop */
52 u32 event_0; /* Event Time Stamp lo 0:31 */
53 u32 event_1; /* Event Type Fields */
54 u32 event_2; /* Event Type Fields domain */
55 u32 event_3; /* Event Time Stamp hi 32:63 */
56 u32 ts_load_val_hi; /* Time Stamp Load High Value 32:63 */
57 u32 ts_comp_hi; /* Time Stamp Comparison High Value 32:63 */
58 u32 ts_add_val; /* Time Stamp Add value */
59 u32 ts_ppm_low; /* Time Stamp PPM Load Low Value 0:31 */
60 u32 ts_ppm_hi; /* Time Stamp PPM Load High Value 32:63 */
61 u32 ts_nudge; /* Time Stamp Nudge value */
62 u32 reserv[33];
63 struct am65_genf_regs genf[AM65_CPTS_GENF_MAX_NUM];
64 struct am65_genf_regs estf[AM65_CPTS_ESTF_MAX_NUM];
65};
66
67/* CONTROL_REG */
68#define AM65_CPTS_CONTROL_EN BIT(0)
69#define AM65_CPTS_CONTROL_INT_TEST BIT(1)
70#define AM65_CPTS_CONTROL_TS_COMP_POLARITY BIT(2)
71#define AM65_CPTS_CONTROL_TSTAMP_EN BIT(3)
72#define AM65_CPTS_CONTROL_SEQUENCE_EN BIT(4)
73#define AM65_CPTS_CONTROL_64MODE BIT(5)
74#define AM65_CPTS_CONTROL_TS_COMP_TOG BIT(6)
75#define AM65_CPTS_CONTROL_TS_PPM_DIR BIT(7)
76#define AM65_CPTS_CONTROL_HW1_TS_PUSH_EN BIT(8)
77#define AM65_CPTS_CONTROL_HW2_TS_PUSH_EN BIT(9)
78#define AM65_CPTS_CONTROL_HW3_TS_PUSH_EN BIT(10)
79#define AM65_CPTS_CONTROL_HW4_TS_PUSH_EN BIT(11)
80#define AM65_CPTS_CONTROL_HW5_TS_PUSH_EN BIT(12)
81#define AM65_CPTS_CONTROL_HW6_TS_PUSH_EN BIT(13)
82#define AM65_CPTS_CONTROL_HW7_TS_PUSH_EN BIT(14)
83#define AM65_CPTS_CONTROL_HW8_TS_PUSH_EN BIT(15)
84#define AM65_CPTS_CONTROL_HW1_TS_PUSH_OFFSET (8)
85
86#define AM65_CPTS_CONTROL_TX_GENF_CLR_EN BIT(17)
87
88#define AM65_CPTS_CONTROL_TS_SYNC_SEL_MASK (0xF)
89#define AM65_CPTS_CONTROL_TS_SYNC_SEL_SHIFT (28)
90
91/* RFTCLK_SEL_REG */
92#define AM65_CPTS_RFTCLK_SEL_MASK (0x1F)
93
94/* TS_PUSH_REG */
95#define AM65_CPTS_TS_PUSH BIT(0)
96
97/* TS_LOAD_EN_REG */
98#define AM65_CPTS_TS_LOAD_EN BIT(0)
99
100/* INTSTAT_RAW_REG */
101#define AM65_CPTS_INTSTAT_RAW_TS_PEND BIT(0)
102
103/* INTSTAT_MASKED_REG */
104#define AM65_CPTS_INTSTAT_MASKED_TS_PEND BIT(0)
105
106/* INT_ENABLE_REG */
107#define AM65_CPTS_INT_ENABLE_TS_PEND_EN BIT(0)
108
109/* TS_COMP_NUDGE_REG */
110#define AM65_CPTS_TS_COMP_NUDGE_MASK (0xFF)
111
112/* EVENT_POP_REG */
113#define AM65_CPTS_EVENT_POP BIT(0)
114
115/* EVENT_1_REG */
116#define AM65_CPTS_EVENT_1_SEQUENCE_ID_MASK GENMASK(15, 0)
117
118#define AM65_CPTS_EVENT_1_MESSAGE_TYPE_MASK GENMASK(19, 16)
119#define AM65_CPTS_EVENT_1_MESSAGE_TYPE_SHIFT (16)
120
121#define AM65_CPTS_EVENT_1_EVENT_TYPE_MASK GENMASK(23, 20)
122#define AM65_CPTS_EVENT_1_EVENT_TYPE_SHIFT (20)
123
124#define AM65_CPTS_EVENT_1_PORT_NUMBER_MASK GENMASK(28, 24)
125#define AM65_CPTS_EVENT_1_PORT_NUMBER_SHIFT (24)
126
127/* EVENT_2_REG */
128#define AM65_CPTS_EVENT_2_REG_DOMAIN_MASK (0xFF)
129#define AM65_CPTS_EVENT_2_REG_DOMAIN_SHIFT (0)
130
131enum {
132 AM65_CPTS_EV_PUSH, /* Time Stamp Push Event */
133 AM65_CPTS_EV_ROLL, /* Time Stamp Rollover Event */
134 AM65_CPTS_EV_HALF, /* Time Stamp Half Rollover Event */
135 AM65_CPTS_EV_HW, /* Hardware Time Stamp Push Event */
136 AM65_CPTS_EV_RX, /* Ethernet Receive Event */
137 AM65_CPTS_EV_TX, /* Ethernet Transmit Event */
138 AM65_CPTS_EV_TS_COMP, /* Time Stamp Compare Event */
139 AM65_CPTS_EV_HOST, /* Host Transmit Event */
140};
141
142struct am65_cpts_event {
143 struct list_head list;
144 unsigned long tmo;
145 u32 event1;
146 u32 event2;
147 u64 timestamp;
148};
149
150#define AM65_CPTS_FIFO_DEPTH (16)
151#define AM65_CPTS_MAX_EVENTS (32)
152#define AM65_CPTS_EVENT_RX_TX_TIMEOUT (20) /* ms */
153#define AM65_CPTS_SKB_TX_WORK_TIMEOUT 1 /* jiffies */
154#define AM65_CPTS_MIN_PPM 0x400
155
156struct am65_cpts {
157 struct device *dev;
158 struct am65_cpts_regs __iomem *reg;
159 struct ptp_clock_info ptp_info;
160 struct ptp_clock *ptp_clock;
161 int phc_index;
162 struct clk_hw *clk_mux_hw;
163 struct device_node *clk_mux_np;
164 struct clk *refclk;
165 u32 refclk_freq;
166 struct list_head events;
167 struct list_head pool;
168 struct am65_cpts_event pool_data[AM65_CPTS_MAX_EVENTS];
169 spinlock_t lock; /* protects events lists*/
170 u32 ext_ts_inputs;
171 u32 genf_num;
172 u32 ts_add_val;
173 int irq;
174 struct mutex ptp_clk_lock; /* PHC access sync */
175 u64 timestamp;
176 u32 genf_enable;
177 u32 hw_ts_enable;
178 u32 estf_enable;
179 struct sk_buff_head txq;
180 bool pps_enabled;
181 bool pps_present;
182 u32 pps_hw_ts_idx;
183 u32 pps_genf_idx;
184 /* context save/restore */
185 u64 sr_cpts_ns;
186 u64 sr_ktime_ns;
187 u32 sr_control;
188 u32 sr_int_enable;
189 u32 sr_rftclk_sel;
190 u32 sr_ts_ppm_hi;
191 u32 sr_ts_ppm_low;
192 struct am65_genf_regs sr_genf[AM65_CPTS_GENF_MAX_NUM];
193 struct am65_genf_regs sr_estf[AM65_CPTS_ESTF_MAX_NUM];
194};
195
196struct am65_cpts_skb_cb_data {
197 unsigned long tmo;
198 u32 skb_mtype_seqid;
199};
200
201#define am65_cpts_write32(c, v, r) writel(v, &(c)->reg->r)
202#define am65_cpts_read32(c, r) readl(&(c)->reg->r)
203
204static void am65_cpts_settime(struct am65_cpts *cpts, u64 start_tstamp)
205{
206 u32 val;
207
208 val = upper_32_bits(start_tstamp);
209 am65_cpts_write32(cpts, val, ts_load_val_hi);
210 val = lower_32_bits(start_tstamp);
211 am65_cpts_write32(cpts, val, ts_load_val_lo);
212
213 am65_cpts_write32(cpts, AM65_CPTS_TS_LOAD_EN, ts_load_en);
214}
215
216static void am65_cpts_set_add_val(struct am65_cpts *cpts)
217{
218 /* select coefficient according to the rate */
219 cpts->ts_add_val = (NSEC_PER_SEC / cpts->refclk_freq - 1) & 0x7;
220
221 am65_cpts_write32(cpts, cpts->ts_add_val, ts_add_val);
222}
223
224static void am65_cpts_disable(struct am65_cpts *cpts)
225{
226 am65_cpts_write32(cpts, 0, control);
227 am65_cpts_write32(cpts, 0, int_enable);
228}
229
230static int am65_cpts_event_get_port(struct am65_cpts_event *event)
231{
232 return (event->event1 & AM65_CPTS_EVENT_1_PORT_NUMBER_MASK) >>
233 AM65_CPTS_EVENT_1_PORT_NUMBER_SHIFT;
234}
235
236static int am65_cpts_event_get_type(struct am65_cpts_event *event)
237{
238 return (event->event1 & AM65_CPTS_EVENT_1_EVENT_TYPE_MASK) >>
239 AM65_CPTS_EVENT_1_EVENT_TYPE_SHIFT;
240}
241
242static int am65_cpts_cpts_purge_events(struct am65_cpts *cpts)
243{
244 struct list_head *this, *next;
245 struct am65_cpts_event *event;
246 int removed = 0;
247
248 list_for_each_safe(this, next, &cpts->events) {
249 event = list_entry(this, struct am65_cpts_event, list);
250 if (time_after(jiffies, event->tmo)) {
251 list_del_init(&event->list);
252 list_add(&event->list, &cpts->pool);
253 ++removed;
254 }
255 }
256
257 if (removed)
258 dev_dbg(cpts->dev, "event pool cleaned up %d\n", removed);
259 return removed ? 0 : -1;
260}
261
262static bool am65_cpts_fifo_pop_event(struct am65_cpts *cpts,
263 struct am65_cpts_event *event)
264{
265 u32 r = am65_cpts_read32(cpts, intstat_raw);
266
267 if (r & AM65_CPTS_INTSTAT_RAW_TS_PEND) {
268 event->timestamp = am65_cpts_read32(cpts, event_0);
269 event->event1 = am65_cpts_read32(cpts, event_1);
270 event->event2 = am65_cpts_read32(cpts, event_2);
271 event->timestamp |= (u64)am65_cpts_read32(cpts, event_3) << 32;
272 am65_cpts_write32(cpts, AM65_CPTS_EVENT_POP, event_pop);
273 return false;
274 }
275 return true;
276}
277
278static int am65_cpts_fifo_read(struct am65_cpts *cpts)
279{
280 struct ptp_clock_event pevent;
281 struct am65_cpts_event *event;
282 bool schedule = false;
283 int i, type, ret = 0;
284 unsigned long flags;
285
286 spin_lock_irqsave(&cpts->lock, flags);
287 for (i = 0; i < AM65_CPTS_FIFO_DEPTH; i++) {
288 event = list_first_entry_or_null(&cpts->pool,
289 struct am65_cpts_event, list);
290
291 if (!event) {
292 if (am65_cpts_cpts_purge_events(cpts)) {
293 dev_err(cpts->dev, "cpts: event pool empty\n");
294 ret = -1;
295 goto out;
296 }
297 continue;
298 }
299
300 if (am65_cpts_fifo_pop_event(cpts, event))
301 break;
302
303 type = am65_cpts_event_get_type(event);
304 switch (type) {
305 case AM65_CPTS_EV_PUSH:
306 cpts->timestamp = event->timestamp;
307 dev_dbg(cpts->dev, "AM65_CPTS_EV_PUSH t:%llu\n",
308 cpts->timestamp);
309 break;
310 case AM65_CPTS_EV_RX:
311 case AM65_CPTS_EV_TX:
312 event->tmo = jiffies +
313 msecs_to_jiffies(AM65_CPTS_EVENT_RX_TX_TIMEOUT);
314
315 list_del_init(&event->list);
316 list_add_tail(&event->list, &cpts->events);
317
318 dev_dbg(cpts->dev,
319 "AM65_CPTS_EV_TX e1:%08x e2:%08x t:%lld\n",
320 event->event1, event->event2,
321 event->timestamp);
322 schedule = true;
323 break;
324 case AM65_CPTS_EV_HW:
325 pevent.index = am65_cpts_event_get_port(event) - 1;
326 pevent.timestamp = event->timestamp;
327 if (cpts->pps_enabled && pevent.index == cpts->pps_hw_ts_idx) {
328 pevent.type = PTP_CLOCK_PPSUSR;
329 pevent.pps_times.ts_real = ns_to_timespec64(pevent.timestamp);
330 } else {
331 pevent.type = PTP_CLOCK_EXTTS;
332 }
333 dev_dbg(cpts->dev, "AM65_CPTS_EV_HW:%s p:%d t:%llu\n",
334 pevent.type == PTP_CLOCK_EXTTS ?
335 "extts" : "pps",
336 pevent.index, event->timestamp);
337
338 ptp_clock_event(cpts->ptp_clock, &pevent);
339 break;
340 case AM65_CPTS_EV_HOST:
341 break;
342 case AM65_CPTS_EV_ROLL:
343 case AM65_CPTS_EV_HALF:
344 case AM65_CPTS_EV_TS_COMP:
345 dev_dbg(cpts->dev,
346 "AM65_CPTS_EVT: %d e1:%08x e2:%08x t:%lld\n",
347 type,
348 event->event1, event->event2,
349 event->timestamp);
350 break;
351 default:
352 dev_err(cpts->dev, "cpts: unknown event type\n");
353 ret = -1;
354 goto out;
355 }
356 }
357
358out:
359 spin_unlock_irqrestore(&cpts->lock, flags);
360
361 if (schedule)
362 ptp_schedule_worker(cpts->ptp_clock, 0);
363
364 return ret;
365}
366
367static u64 am65_cpts_gettime(struct am65_cpts *cpts,
368 struct ptp_system_timestamp *sts)
369{
370 unsigned long flags;
371 u64 val = 0;
372
373 /* temporarily disable cpts interrupt to avoid intentional
374 * doubled read. Interrupt can be in-flight - it's Ok.
375 */
376 am65_cpts_write32(cpts, 0, int_enable);
377
378 /* use spin_lock_irqsave() here as it has to run very fast */
379 spin_lock_irqsave(&cpts->lock, flags);
380 ptp_read_system_prets(sts);
381 am65_cpts_write32(cpts, AM65_CPTS_TS_PUSH, ts_push);
382 am65_cpts_read32(cpts, ts_push);
383 ptp_read_system_postts(sts);
384 spin_unlock_irqrestore(&cpts->lock, flags);
385
386 am65_cpts_fifo_read(cpts);
387
388 am65_cpts_write32(cpts, AM65_CPTS_INT_ENABLE_TS_PEND_EN, int_enable);
389
390 val = cpts->timestamp;
391
392 return val;
393}
394
395static irqreturn_t am65_cpts_interrupt(int irq, void *dev_id)
396{
397 struct am65_cpts *cpts = dev_id;
398
399 if (am65_cpts_fifo_read(cpts))
400 dev_dbg(cpts->dev, "cpts: unable to obtain a time stamp\n");
401
402 return IRQ_HANDLED;
403}
404
405/* PTP clock operations */
406static int am65_cpts_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
407{
408 struct am65_cpts *cpts = container_of(ptp, struct am65_cpts, ptp_info);
409 u32 estf_ctrl_val = 0, estf_ppm_hi = 0, estf_ppm_low = 0;
410 s32 ppb = scaled_ppm_to_ppb(scaled_ppm);
411 int pps_index = cpts->pps_genf_idx;
412 u64 adj_period, pps_adj_period;
413 u32 ctrl_val, ppm_hi, ppm_low;
414 unsigned long flags;
415 int neg_adj = 0, i;
416
417 if (ppb < 0) {
418 neg_adj = 1;
419 ppb = -ppb;
420 }
421
422 /* base freq = 1GHz = 1 000 000 000
423 * ppb_norm = ppb * base_freq / clock_freq;
424 * ppm_norm = ppb_norm / 1000
425 * adj_period = 1 000 000 / ppm_norm
426 * adj_period = 1 000 000 000 / ppb_norm
427 * adj_period = 1 000 000 000 / (ppb * base_freq / clock_freq)
428 * adj_period = (1 000 000 000 * clock_freq) / (ppb * base_freq)
429 * adj_period = clock_freq / ppb
430 */
431 adj_period = div_u64(cpts->refclk_freq, ppb);
432
433 mutex_lock(&cpts->ptp_clk_lock);
434
435 ctrl_val = am65_cpts_read32(cpts, control);
436 if (neg_adj)
437 ctrl_val |= AM65_CPTS_CONTROL_TS_PPM_DIR;
438 else
439 ctrl_val &= ~AM65_CPTS_CONTROL_TS_PPM_DIR;
440
441 ppm_hi = upper_32_bits(adj_period) & 0x3FF;
442 ppm_low = lower_32_bits(adj_period);
443
444 if (cpts->pps_enabled) {
445 estf_ctrl_val = am65_cpts_read32(cpts, genf[pps_index].control);
446 if (neg_adj)
447 estf_ctrl_val &= ~BIT(1);
448 else
449 estf_ctrl_val |= BIT(1);
450
451 /* GenF PPM will do correction using cpts refclk tick which is
452 * (cpts->ts_add_val + 1) ns, so GenF length PPM adj period
453 * need to be corrected.
454 */
455 pps_adj_period = adj_period * (cpts->ts_add_val + 1);
456 estf_ppm_hi = upper_32_bits(pps_adj_period) & 0x3FF;
457 estf_ppm_low = lower_32_bits(pps_adj_period);
458 }
459
460 spin_lock_irqsave(&cpts->lock, flags);
461
462 /* All below writes must be done extremely fast:
463 * - delay between PPM dir and PPM value changes can cause err due old
464 * PPM correction applied in wrong direction
465 * - delay between CPTS-clock PPM cfg and GenF PPM cfg can cause err
466 * due CPTS-clock PPM working with new cfg while GenF PPM cfg still
467 * with old for short period of time
468 */
469
470 am65_cpts_write32(cpts, ctrl_val, control);
471 am65_cpts_write32(cpts, ppm_hi, ts_ppm_hi);
472 am65_cpts_write32(cpts, ppm_low, ts_ppm_low);
473
474 if (cpts->pps_enabled) {
475 am65_cpts_write32(cpts, estf_ctrl_val, genf[pps_index].control);
476 am65_cpts_write32(cpts, estf_ppm_hi, genf[pps_index].ppm_hi);
477 am65_cpts_write32(cpts, estf_ppm_low, genf[pps_index].ppm_low);
478 }
479
480 for (i = 0; i < AM65_CPTS_ESTF_MAX_NUM; i++) {
481 if (cpts->estf_enable & BIT(i)) {
482 am65_cpts_write32(cpts, estf_ctrl_val, estf[i].control);
483 am65_cpts_write32(cpts, estf_ppm_hi, estf[i].ppm_hi);
484 am65_cpts_write32(cpts, estf_ppm_low, estf[i].ppm_low);
485 }
486 }
487 /* All GenF/EstF can be updated here the same way */
488 spin_unlock_irqrestore(&cpts->lock, flags);
489
490 mutex_unlock(&cpts->ptp_clk_lock);
491
492 return 0;
493}
494
495static int am65_cpts_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
496{
497 struct am65_cpts *cpts = container_of(ptp, struct am65_cpts, ptp_info);
498 s64 ns;
499
500 mutex_lock(&cpts->ptp_clk_lock);
501 ns = am65_cpts_gettime(cpts, NULL);
502 ns += delta;
503 am65_cpts_settime(cpts, ns);
504 mutex_unlock(&cpts->ptp_clk_lock);
505
506 return 0;
507}
508
509static int am65_cpts_ptp_gettimex(struct ptp_clock_info *ptp,
510 struct timespec64 *ts,
511 struct ptp_system_timestamp *sts)
512{
513 struct am65_cpts *cpts = container_of(ptp, struct am65_cpts, ptp_info);
514 u64 ns;
515
516 mutex_lock(&cpts->ptp_clk_lock);
517 ns = am65_cpts_gettime(cpts, sts);
518 mutex_unlock(&cpts->ptp_clk_lock);
519 *ts = ns_to_timespec64(ns);
520
521 return 0;
522}
523
524u64 am65_cpts_ns_gettime(struct am65_cpts *cpts)
525{
526 u64 ns;
527
528 /* reuse ptp_clk_lock as it serialize ts push */
529 mutex_lock(&cpts->ptp_clk_lock);
530 ns = am65_cpts_gettime(cpts, NULL);
531 mutex_unlock(&cpts->ptp_clk_lock);
532
533 return ns;
534}
535EXPORT_SYMBOL_GPL(am65_cpts_ns_gettime);
536
537static int am65_cpts_ptp_settime(struct ptp_clock_info *ptp,
538 const struct timespec64 *ts)
539{
540 struct am65_cpts *cpts = container_of(ptp, struct am65_cpts, ptp_info);
541 u64 ns;
542
543 ns = timespec64_to_ns(ts);
544 mutex_lock(&cpts->ptp_clk_lock);
545 am65_cpts_settime(cpts, ns);
546 mutex_unlock(&cpts->ptp_clk_lock);
547
548 return 0;
549}
550
551static void am65_cpts_extts_enable_hw(struct am65_cpts *cpts, u32 index, int on)
552{
553 u32 v;
554
555 v = am65_cpts_read32(cpts, control);
556 if (on) {
557 v |= BIT(AM65_CPTS_CONTROL_HW1_TS_PUSH_OFFSET + index);
558 cpts->hw_ts_enable |= BIT(index);
559 } else {
560 v &= ~BIT(AM65_CPTS_CONTROL_HW1_TS_PUSH_OFFSET + index);
561 cpts->hw_ts_enable &= ~BIT(index);
562 }
563 am65_cpts_write32(cpts, v, control);
564}
565
566static int am65_cpts_extts_enable(struct am65_cpts *cpts, u32 index, int on)
567{
568 if (index >= cpts->ptp_info.n_ext_ts)
569 return -ENXIO;
570
571 if (cpts->pps_present && index == cpts->pps_hw_ts_idx)
572 return -EINVAL;
573
574 if (((cpts->hw_ts_enable & BIT(index)) >> index) == on)
575 return 0;
576
577 mutex_lock(&cpts->ptp_clk_lock);
578 am65_cpts_extts_enable_hw(cpts, index, on);
579 mutex_unlock(&cpts->ptp_clk_lock);
580
581 dev_dbg(cpts->dev, "%s: ExtTS:%u %s\n",
582 __func__, index, on ? "enabled" : "disabled");
583
584 return 0;
585}
586
587int am65_cpts_estf_enable(struct am65_cpts *cpts, int idx,
588 struct am65_cpts_estf_cfg *cfg)
589{
590 u64 cycles;
591 u32 val;
592
593 cycles = cfg->ns_period * cpts->refclk_freq;
594 cycles = DIV_ROUND_UP(cycles, NSEC_PER_SEC);
595 if (cycles > U32_MAX)
596 return -EINVAL;
597
598 /* according to TRM should be zeroed */
599 am65_cpts_write32(cpts, 0, estf[idx].length);
600
601 val = upper_32_bits(cfg->ns_start);
602 am65_cpts_write32(cpts, val, estf[idx].comp_hi);
603 val = lower_32_bits(cfg->ns_start);
604 am65_cpts_write32(cpts, val, estf[idx].comp_lo);
605 val = lower_32_bits(cycles);
606 am65_cpts_write32(cpts, val, estf[idx].length);
607 am65_cpts_write32(cpts, 0, estf[idx].control);
608 am65_cpts_write32(cpts, 0, estf[idx].ppm_hi);
609 am65_cpts_write32(cpts, 0, estf[idx].ppm_low);
610
611 cpts->estf_enable |= BIT(idx);
612
613 dev_dbg(cpts->dev, "%s: ESTF:%u enabled\n", __func__, idx);
614
615 return 0;
616}
617EXPORT_SYMBOL_GPL(am65_cpts_estf_enable);
618
619void am65_cpts_estf_disable(struct am65_cpts *cpts, int idx)
620{
621 am65_cpts_write32(cpts, 0, estf[idx].length);
622 cpts->estf_enable &= ~BIT(idx);
623
624 dev_dbg(cpts->dev, "%s: ESTF:%u disabled\n", __func__, idx);
625}
626EXPORT_SYMBOL_GPL(am65_cpts_estf_disable);
627
628static void am65_cpts_perout_enable_hw(struct am65_cpts *cpts,
629 struct ptp_perout_request *req, int on)
630{
631 u64 ns_period, ns_start, cycles;
632 struct timespec64 ts;
633 u32 val;
634
635 if (on) {
636 ts.tv_sec = req->period.sec;
637 ts.tv_nsec = req->period.nsec;
638 ns_period = timespec64_to_ns(&ts);
639
640 cycles = (ns_period * cpts->refclk_freq) / NSEC_PER_SEC;
641
642 ts.tv_sec = req->start.sec;
643 ts.tv_nsec = req->start.nsec;
644 ns_start = timespec64_to_ns(&ts);
645
646 val = upper_32_bits(ns_start);
647 am65_cpts_write32(cpts, val, genf[req->index].comp_hi);
648 val = lower_32_bits(ns_start);
649 am65_cpts_write32(cpts, val, genf[req->index].comp_lo);
650 val = lower_32_bits(cycles);
651 am65_cpts_write32(cpts, val, genf[req->index].length);
652
653 am65_cpts_write32(cpts, 0, genf[req->index].control);
654 am65_cpts_write32(cpts, 0, genf[req->index].ppm_hi);
655 am65_cpts_write32(cpts, 0, genf[req->index].ppm_low);
656
657 cpts->genf_enable |= BIT(req->index);
658 } else {
659 am65_cpts_write32(cpts, 0, genf[req->index].length);
660
661 cpts->genf_enable &= ~BIT(req->index);
662 }
663}
664
665static int am65_cpts_perout_enable(struct am65_cpts *cpts,
666 struct ptp_perout_request *req, int on)
667{
668 if (req->index >= cpts->ptp_info.n_per_out)
669 return -ENXIO;
670
671 if (cpts->pps_present && req->index == cpts->pps_genf_idx)
672 return -EINVAL;
673
674 if (!!(cpts->genf_enable & BIT(req->index)) == !!on)
675 return 0;
676
677 mutex_lock(&cpts->ptp_clk_lock);
678 am65_cpts_perout_enable_hw(cpts, req, on);
679 mutex_unlock(&cpts->ptp_clk_lock);
680
681 dev_dbg(cpts->dev, "%s: GenF:%u %s\n",
682 __func__, req->index, on ? "enabled" : "disabled");
683
684 return 0;
685}
686
687static int am65_cpts_pps_enable(struct am65_cpts *cpts, int on)
688{
689 int ret = 0;
690 struct timespec64 ts;
691 struct ptp_clock_request rq;
692 u64 ns;
693
694 if (!cpts->pps_present)
695 return -EINVAL;
696
697 if (cpts->pps_enabled == !!on)
698 return 0;
699
700 mutex_lock(&cpts->ptp_clk_lock);
701
702 if (on) {
703 am65_cpts_extts_enable_hw(cpts, cpts->pps_hw_ts_idx, on);
704
705 ns = am65_cpts_gettime(cpts, NULL);
706 ts = ns_to_timespec64(ns);
707 rq.perout.period.sec = 1;
708 rq.perout.period.nsec = 0;
709 rq.perout.start.sec = ts.tv_sec + 2;
710 rq.perout.start.nsec = 0;
711 rq.perout.index = cpts->pps_genf_idx;
712
713 am65_cpts_perout_enable_hw(cpts, &rq.perout, on);
714 cpts->pps_enabled = true;
715 } else {
716 rq.perout.index = cpts->pps_genf_idx;
717 am65_cpts_perout_enable_hw(cpts, &rq.perout, on);
718 am65_cpts_extts_enable_hw(cpts, cpts->pps_hw_ts_idx, on);
719 cpts->pps_enabled = false;
720 }
721
722 mutex_unlock(&cpts->ptp_clk_lock);
723
724 dev_dbg(cpts->dev, "%s: pps: %s\n",
725 __func__, on ? "enabled" : "disabled");
726 return ret;
727}
728
729static int am65_cpts_ptp_enable(struct ptp_clock_info *ptp,
730 struct ptp_clock_request *rq, int on)
731{
732 struct am65_cpts *cpts = container_of(ptp, struct am65_cpts, ptp_info);
733
734 switch (rq->type) {
735 case PTP_CLK_REQ_EXTTS:
736 return am65_cpts_extts_enable(cpts, rq->extts.index, on);
737 case PTP_CLK_REQ_PEROUT:
738 return am65_cpts_perout_enable(cpts, &rq->perout, on);
739 case PTP_CLK_REQ_PPS:
740 return am65_cpts_pps_enable(cpts, on);
741 default:
742 break;
743 }
744
745 return -EOPNOTSUPP;
746}
747
748static long am65_cpts_ts_work(struct ptp_clock_info *ptp);
749
750static struct ptp_clock_info am65_ptp_info = {
751 .owner = THIS_MODULE,
752 .name = "CTPS timer",
753 .adjfine = am65_cpts_ptp_adjfine,
754 .adjtime = am65_cpts_ptp_adjtime,
755 .gettimex64 = am65_cpts_ptp_gettimex,
756 .settime64 = am65_cpts_ptp_settime,
757 .enable = am65_cpts_ptp_enable,
758 .do_aux_work = am65_cpts_ts_work,
759};
760
761static bool am65_cpts_match_tx_ts(struct am65_cpts *cpts,
762 struct am65_cpts_event *event)
763{
764 struct sk_buff_head txq_list;
765 struct sk_buff *skb, *tmp;
766 unsigned long flags;
767 bool found = false;
768 u32 mtype_seqid;
769
770 mtype_seqid = event->event1 &
771 (AM65_CPTS_EVENT_1_MESSAGE_TYPE_MASK |
772 AM65_CPTS_EVENT_1_EVENT_TYPE_MASK |
773 AM65_CPTS_EVENT_1_SEQUENCE_ID_MASK);
774
775 __skb_queue_head_init(&txq_list);
776
777 spin_lock_irqsave(&cpts->txq.lock, flags);
778 skb_queue_splice_init(&cpts->txq, &txq_list);
779 spin_unlock_irqrestore(&cpts->txq.lock, flags);
780
781 /* no need to grab txq.lock as access is always done under cpts->lock */
782 skb_queue_walk_safe(&txq_list, skb, tmp) {
783 struct skb_shared_hwtstamps ssh;
784 struct am65_cpts_skb_cb_data *skb_cb =
785 (struct am65_cpts_skb_cb_data *)skb->cb;
786
787 if (mtype_seqid == skb_cb->skb_mtype_seqid) {
788 u64 ns = event->timestamp;
789
790 memset(&ssh, 0, sizeof(ssh));
791 ssh.hwtstamp = ns_to_ktime(ns);
792 skb_tstamp_tx(skb, &ssh);
793 found = true;
794 __skb_unlink(skb, &txq_list);
795 dev_consume_skb_any(skb);
796 dev_dbg(cpts->dev,
797 "match tx timestamp mtype_seqid %08x\n",
798 mtype_seqid);
799 break;
800 }
801
802 if (time_after(jiffies, skb_cb->tmo)) {
803 /* timeout any expired skbs over 100 ms */
804 dev_dbg(cpts->dev,
805 "expiring tx timestamp mtype_seqid %08x\n",
806 mtype_seqid);
807 __skb_unlink(skb, &txq_list);
808 dev_consume_skb_any(skb);
809 }
810 }
811
812 spin_lock_irqsave(&cpts->txq.lock, flags);
813 skb_queue_splice(&txq_list, &cpts->txq);
814 spin_unlock_irqrestore(&cpts->txq.lock, flags);
815
816 return found;
817}
818
819static void am65_cpts_find_ts(struct am65_cpts *cpts)
820{
821 struct am65_cpts_event *event;
822 struct list_head *this, *next;
823 LIST_HEAD(events_free);
824 unsigned long flags;
825 LIST_HEAD(events);
826
827 spin_lock_irqsave(&cpts->lock, flags);
828 list_splice_init(&cpts->events, &events);
829 spin_unlock_irqrestore(&cpts->lock, flags);
830
831 list_for_each_safe(this, next, &events) {
832 event = list_entry(this, struct am65_cpts_event, list);
833 if (am65_cpts_match_tx_ts(cpts, event) ||
834 time_after(jiffies, event->tmo)) {
835 list_del_init(&event->list);
836 list_add(&event->list, &events_free);
837 }
838 }
839
840 spin_lock_irqsave(&cpts->lock, flags);
841 list_splice_tail(&events, &cpts->events);
842 list_splice_tail(&events_free, &cpts->pool);
843 spin_unlock_irqrestore(&cpts->lock, flags);
844}
845
846static long am65_cpts_ts_work(struct ptp_clock_info *ptp)
847{
848 struct am65_cpts *cpts = container_of(ptp, struct am65_cpts, ptp_info);
849 unsigned long flags;
850 long delay = -1;
851
852 am65_cpts_find_ts(cpts);
853
854 spin_lock_irqsave(&cpts->txq.lock, flags);
855 if (!skb_queue_empty(&cpts->txq))
856 delay = AM65_CPTS_SKB_TX_WORK_TIMEOUT;
857 spin_unlock_irqrestore(&cpts->txq.lock, flags);
858
859 return delay;
860}
861
862/**
863 * am65_cpts_rx_enable - enable rx timestamping
864 * @cpts: cpts handle
865 * @en: enable
866 *
867 * This functions enables rx packets timestamping. The CPTS can timestamp all
868 * rx packets.
869 */
870void am65_cpts_rx_enable(struct am65_cpts *cpts, bool en)
871{
872 u32 val;
873
874 mutex_lock(&cpts->ptp_clk_lock);
875 val = am65_cpts_read32(cpts, control);
876 if (en)
877 val |= AM65_CPTS_CONTROL_TSTAMP_EN;
878 else
879 val &= ~AM65_CPTS_CONTROL_TSTAMP_EN;
880 am65_cpts_write32(cpts, val, control);
881 mutex_unlock(&cpts->ptp_clk_lock);
882}
883EXPORT_SYMBOL_GPL(am65_cpts_rx_enable);
884
885static int am65_skb_get_mtype_seqid(struct sk_buff *skb, u32 *mtype_seqid)
886{
887 unsigned int ptp_class = ptp_classify_raw(skb);
888 struct ptp_header *hdr;
889 u8 msgtype;
890 u16 seqid;
891
892 if (ptp_class == PTP_CLASS_NONE)
893 return 0;
894
895 hdr = ptp_parse_header(skb, ptp_class);
896 if (!hdr)
897 return 0;
898
899 msgtype = ptp_get_msgtype(hdr, ptp_class);
900 seqid = ntohs(hdr->sequence_id);
901
902 *mtype_seqid = (msgtype << AM65_CPTS_EVENT_1_MESSAGE_TYPE_SHIFT) &
903 AM65_CPTS_EVENT_1_MESSAGE_TYPE_MASK;
904 *mtype_seqid |= (seqid & AM65_CPTS_EVENT_1_SEQUENCE_ID_MASK);
905
906 return 1;
907}
908
909/**
910 * am65_cpts_tx_timestamp - save tx packet for timestamping
911 * @cpts: cpts handle
912 * @skb: packet
913 *
914 * This functions saves tx packet for timestamping if packet can be timestamped.
915 * The future processing is done in from PTP auxiliary worker.
916 */
917void am65_cpts_tx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb)
918{
919 struct am65_cpts_skb_cb_data *skb_cb = (void *)skb->cb;
920
921 if (!(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
922 return;
923
924 /* add frame to queue for processing later.
925 * The periodic FIFO check will handle this.
926 */
927 skb_get(skb);
928 /* get the timestamp for timeouts */
929 skb_cb->tmo = jiffies + msecs_to_jiffies(100);
930 skb_queue_tail(&cpts->txq, skb);
931 ptp_schedule_worker(cpts->ptp_clock, 0);
932}
933EXPORT_SYMBOL_GPL(am65_cpts_tx_timestamp);
934
935/**
936 * am65_cpts_prep_tx_timestamp - check and prepare tx packet for timestamping
937 * @cpts: cpts handle
938 * @skb: packet
939 *
940 * This functions should be called from .xmit().
941 * It checks if packet can be timestamped, fills internal cpts data
942 * in skb-cb and marks packet as SKBTX_IN_PROGRESS.
943 */
944void am65_cpts_prep_tx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb)
945{
946 struct am65_cpts_skb_cb_data *skb_cb = (void *)skb->cb;
947 int ret;
948
949 if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
950 return;
951
952 ret = am65_skb_get_mtype_seqid(skb, &skb_cb->skb_mtype_seqid);
953 if (!ret)
954 return;
955 skb_cb->skb_mtype_seqid |= (AM65_CPTS_EV_TX <<
956 AM65_CPTS_EVENT_1_EVENT_TYPE_SHIFT);
957
958 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
959}
960EXPORT_SYMBOL_GPL(am65_cpts_prep_tx_timestamp);
961
962int am65_cpts_phc_index(struct am65_cpts *cpts)
963{
964 return cpts->phc_index;
965}
966EXPORT_SYMBOL_GPL(am65_cpts_phc_index);
967
968static void cpts_free_clk_mux(void *data)
969{
970 struct am65_cpts *cpts = data;
971
972 of_clk_del_provider(cpts->clk_mux_np);
973 clk_hw_unregister_mux(cpts->clk_mux_hw);
974 of_node_put(cpts->clk_mux_np);
975}
976
977static int cpts_of_mux_clk_setup(struct am65_cpts *cpts,
978 struct device_node *node)
979{
980 unsigned int num_parents;
981 const char **parent_names;
982 char *clk_mux_name;
983 void __iomem *reg;
984 int ret = -EINVAL;
985
986 cpts->clk_mux_np = of_get_child_by_name(node, "refclk-mux");
987 if (!cpts->clk_mux_np)
988 return 0;
989
990 num_parents = of_clk_get_parent_count(cpts->clk_mux_np);
991 if (num_parents < 1) {
992 dev_err(cpts->dev, "mux-clock %pOF must have parents\n",
993 cpts->clk_mux_np);
994 goto mux_fail;
995 }
996
997 parent_names = devm_kcalloc(cpts->dev, sizeof(char *), num_parents,
998 GFP_KERNEL);
999 if (!parent_names) {
1000 ret = -ENOMEM;
1001 goto mux_fail;
1002 }
1003
1004 of_clk_parent_fill(cpts->clk_mux_np, parent_names, num_parents);
1005
1006 clk_mux_name = devm_kasprintf(cpts->dev, GFP_KERNEL, "%s.%pOFn",
1007 dev_name(cpts->dev), cpts->clk_mux_np);
1008 if (!clk_mux_name) {
1009 ret = -ENOMEM;
1010 goto mux_fail;
1011 }
1012
1013 reg = &cpts->reg->rftclk_sel;
1014 /* dev must be NULL to avoid recursive incrementing
1015 * of module refcnt
1016 */
1017 cpts->clk_mux_hw = clk_hw_register_mux(NULL, clk_mux_name,
1018 parent_names, num_parents,
1019 0, reg, 0, 5, 0, NULL);
1020 if (IS_ERR(cpts->clk_mux_hw)) {
1021 ret = PTR_ERR(cpts->clk_mux_hw);
1022 goto mux_fail;
1023 }
1024
1025 ret = of_clk_add_hw_provider(cpts->clk_mux_np, of_clk_hw_simple_get,
1026 cpts->clk_mux_hw);
1027 if (ret)
1028 goto clk_hw_register;
1029
1030 ret = devm_add_action_or_reset(cpts->dev, cpts_free_clk_mux, cpts);
1031 if (ret)
1032 dev_err(cpts->dev, "failed to add clkmux reset action %d", ret);
1033
1034 return ret;
1035
1036clk_hw_register:
1037 clk_hw_unregister_mux(cpts->clk_mux_hw);
1038mux_fail:
1039 of_node_put(cpts->clk_mux_np);
1040 return ret;
1041}
1042
1043static int am65_cpts_of_parse(struct am65_cpts *cpts, struct device_node *node)
1044{
1045 u32 prop[2];
1046
1047 if (!of_property_read_u32(node, "ti,cpts-ext-ts-inputs", &prop[0]))
1048 cpts->ext_ts_inputs = prop[0];
1049
1050 if (!of_property_read_u32(node, "ti,cpts-periodic-outputs", &prop[0]))
1051 cpts->genf_num = prop[0];
1052
1053 if (!of_property_read_u32_array(node, "ti,pps", prop, 2)) {
1054 cpts->pps_present = true;
1055
1056 if (prop[0] > 7) {
1057 dev_err(cpts->dev, "invalid HWx_TS_PUSH index: %u provided\n", prop[0]);
1058 cpts->pps_present = false;
1059 }
1060 if (prop[1] > 1) {
1061 dev_err(cpts->dev, "invalid GENFy index: %u provided\n", prop[1]);
1062 cpts->pps_present = false;
1063 }
1064 if (cpts->pps_present) {
1065 cpts->pps_hw_ts_idx = prop[0];
1066 cpts->pps_genf_idx = prop[1];
1067 }
1068 }
1069
1070 return cpts_of_mux_clk_setup(cpts, node);
1071}
1072
1073void am65_cpts_release(struct am65_cpts *cpts)
1074{
1075 ptp_clock_unregister(cpts->ptp_clock);
1076 am65_cpts_disable(cpts);
1077 clk_disable_unprepare(cpts->refclk);
1078}
1079EXPORT_SYMBOL_GPL(am65_cpts_release);
1080
1081struct am65_cpts *am65_cpts_create(struct device *dev, void __iomem *regs,
1082 struct device_node *node)
1083{
1084 struct am65_cpts *cpts;
1085 int ret, i;
1086
1087 cpts = devm_kzalloc(dev, sizeof(*cpts), GFP_KERNEL);
1088 if (!cpts)
1089 return ERR_PTR(-ENOMEM);
1090
1091 cpts->dev = dev;
1092 cpts->reg = (struct am65_cpts_regs __iomem *)regs;
1093
1094 cpts->irq = of_irq_get_byname(node, "cpts");
1095 if (cpts->irq <= 0) {
1096 ret = cpts->irq ?: -ENXIO;
1097 dev_err_probe(dev, ret, "Failed to get IRQ number\n");
1098 return ERR_PTR(ret);
1099 }
1100
1101 ret = am65_cpts_of_parse(cpts, node);
1102 if (ret)
1103 return ERR_PTR(ret);
1104
1105 mutex_init(&cpts->ptp_clk_lock);
1106 INIT_LIST_HEAD(&cpts->events);
1107 INIT_LIST_HEAD(&cpts->pool);
1108 spin_lock_init(&cpts->lock);
1109 skb_queue_head_init(&cpts->txq);
1110
1111 for (i = 0; i < AM65_CPTS_MAX_EVENTS; i++)
1112 list_add(&cpts->pool_data[i].list, &cpts->pool);
1113
1114 cpts->refclk = devm_get_clk_from_child(dev, node, "cpts");
1115 if (IS_ERR(cpts->refclk)) {
1116 ret = PTR_ERR(cpts->refclk);
1117 dev_err_probe(dev, ret, "Failed to get refclk\n");
1118 return ERR_PTR(ret);
1119 }
1120
1121 ret = clk_prepare_enable(cpts->refclk);
1122 if (ret) {
1123 dev_err(dev, "Failed to enable refclk %d\n", ret);
1124 return ERR_PTR(ret);
1125 }
1126
1127 cpts->refclk_freq = clk_get_rate(cpts->refclk);
1128
1129 am65_ptp_info.max_adj = cpts->refclk_freq / AM65_CPTS_MIN_PPM;
1130 cpts->ptp_info = am65_ptp_info;
1131
1132 if (cpts->ext_ts_inputs)
1133 cpts->ptp_info.n_ext_ts = cpts->ext_ts_inputs;
1134 if (cpts->genf_num)
1135 cpts->ptp_info.n_per_out = cpts->genf_num;
1136 if (cpts->pps_present)
1137 cpts->ptp_info.pps = 1;
1138
1139 am65_cpts_set_add_val(cpts);
1140
1141 am65_cpts_write32(cpts, AM65_CPTS_CONTROL_EN |
1142 AM65_CPTS_CONTROL_64MODE |
1143 AM65_CPTS_CONTROL_TX_GENF_CLR_EN,
1144 control);
1145 am65_cpts_write32(cpts, AM65_CPTS_INT_ENABLE_TS_PEND_EN, int_enable);
1146
1147 /* set time to the current system time */
1148 am65_cpts_settime(cpts, ktime_to_ns(ktime_get_real()));
1149
1150 cpts->ptp_clock = ptp_clock_register(&cpts->ptp_info, cpts->dev);
1151 if (IS_ERR_OR_NULL(cpts->ptp_clock)) {
1152 dev_err(dev, "Failed to register ptp clk %ld\n",
1153 PTR_ERR(cpts->ptp_clock));
1154 ret = cpts->ptp_clock ? PTR_ERR(cpts->ptp_clock) : -ENODEV;
1155 goto refclk_disable;
1156 }
1157 cpts->phc_index = ptp_clock_index(cpts->ptp_clock);
1158
1159 ret = devm_request_threaded_irq(dev, cpts->irq, NULL,
1160 am65_cpts_interrupt,
1161 IRQF_ONESHOT, dev_name(dev), cpts);
1162 if (ret < 0) {
1163 dev_err(cpts->dev, "error attaching irq %d\n", ret);
1164 goto reset_ptpclk;
1165 }
1166
1167 dev_info(dev, "CPTS ver 0x%08x, freq:%u, add_val:%u pps:%d\n",
1168 am65_cpts_read32(cpts, idver),
1169 cpts->refclk_freq, cpts->ts_add_val, cpts->pps_present);
1170
1171 return cpts;
1172
1173reset_ptpclk:
1174 am65_cpts_release(cpts);
1175refclk_disable:
1176 clk_disable_unprepare(cpts->refclk);
1177 return ERR_PTR(ret);
1178}
1179EXPORT_SYMBOL_GPL(am65_cpts_create);
1180
1181void am65_cpts_suspend(struct am65_cpts *cpts)
1182{
1183 /* save state and disable CPTS */
1184 cpts->sr_control = am65_cpts_read32(cpts, control);
1185 cpts->sr_int_enable = am65_cpts_read32(cpts, int_enable);
1186 cpts->sr_rftclk_sel = am65_cpts_read32(cpts, rftclk_sel);
1187 cpts->sr_ts_ppm_hi = am65_cpts_read32(cpts, ts_ppm_hi);
1188 cpts->sr_ts_ppm_low = am65_cpts_read32(cpts, ts_ppm_low);
1189 cpts->sr_cpts_ns = am65_cpts_gettime(cpts, NULL);
1190 cpts->sr_ktime_ns = ktime_to_ns(ktime_get_real());
1191 am65_cpts_disable(cpts);
1192 clk_disable(cpts->refclk);
1193
1194 /* Save GENF state */
1195 memcpy_fromio(&cpts->sr_genf, &cpts->reg->genf, sizeof(cpts->sr_genf));
1196
1197 /* Save ESTF state */
1198 memcpy_fromio(&cpts->sr_estf, &cpts->reg->estf, sizeof(cpts->sr_estf));
1199}
1200EXPORT_SYMBOL_GPL(am65_cpts_suspend);
1201
1202void am65_cpts_resume(struct am65_cpts *cpts)
1203{
1204 int i;
1205 s64 ktime_ns;
1206
1207 /* restore state and enable CPTS */
1208 clk_enable(cpts->refclk);
1209 am65_cpts_write32(cpts, cpts->sr_rftclk_sel, rftclk_sel);
1210 am65_cpts_set_add_val(cpts);
1211 am65_cpts_write32(cpts, cpts->sr_control, control);
1212 am65_cpts_write32(cpts, cpts->sr_int_enable, int_enable);
1213
1214 /* Restore time to saved CPTS time + time in suspend/resume */
1215 ktime_ns = ktime_to_ns(ktime_get_real());
1216 ktime_ns -= cpts->sr_ktime_ns;
1217 am65_cpts_settime(cpts, cpts->sr_cpts_ns + ktime_ns);
1218
1219 /* Restore compensation (PPM) */
1220 am65_cpts_write32(cpts, cpts->sr_ts_ppm_hi, ts_ppm_hi);
1221 am65_cpts_write32(cpts, cpts->sr_ts_ppm_low, ts_ppm_low);
1222
1223 /* Restore GENF state */
1224 for (i = 0; i < AM65_CPTS_GENF_MAX_NUM; i++) {
1225 am65_cpts_write32(cpts, 0, genf[i].length); /* TRM sequence */
1226 am65_cpts_write32(cpts, cpts->sr_genf[i].comp_hi, genf[i].comp_hi);
1227 am65_cpts_write32(cpts, cpts->sr_genf[i].comp_lo, genf[i].comp_lo);
1228 am65_cpts_write32(cpts, cpts->sr_genf[i].length, genf[i].length);
1229 am65_cpts_write32(cpts, cpts->sr_genf[i].control, genf[i].control);
1230 am65_cpts_write32(cpts, cpts->sr_genf[i].ppm_hi, genf[i].ppm_hi);
1231 am65_cpts_write32(cpts, cpts->sr_genf[i].ppm_low, genf[i].ppm_low);
1232 }
1233
1234 /* Restore ESTTF state */
1235 for (i = 0; i < AM65_CPTS_ESTF_MAX_NUM; i++) {
1236 am65_cpts_write32(cpts, 0, estf[i].length); /* TRM sequence */
1237 am65_cpts_write32(cpts, cpts->sr_estf[i].comp_hi, estf[i].comp_hi);
1238 am65_cpts_write32(cpts, cpts->sr_estf[i].comp_lo, estf[i].comp_lo);
1239 am65_cpts_write32(cpts, cpts->sr_estf[i].length, estf[i].length);
1240 am65_cpts_write32(cpts, cpts->sr_estf[i].control, estf[i].control);
1241 am65_cpts_write32(cpts, cpts->sr_estf[i].ppm_hi, estf[i].ppm_hi);
1242 am65_cpts_write32(cpts, cpts->sr_estf[i].ppm_low, estf[i].ppm_low);
1243 }
1244}
1245EXPORT_SYMBOL_GPL(am65_cpts_resume);
1246
1247static int am65_cpts_probe(struct platform_device *pdev)
1248{
1249 struct device_node *node = pdev->dev.of_node;
1250 struct device *dev = &pdev->dev;
1251 struct am65_cpts *cpts;
1252 void __iomem *base;
1253
1254 base = devm_platform_ioremap_resource_byname(pdev, "cpts");
1255 if (IS_ERR(base))
1256 return PTR_ERR(base);
1257
1258 cpts = am65_cpts_create(dev, base, node);
1259 return PTR_ERR_OR_ZERO(cpts);
1260}
1261
1262static const struct of_device_id am65_cpts_of_match[] = {
1263 { .compatible = "ti,am65-cpts", },
1264 { .compatible = "ti,j721e-cpts", },
1265 {},
1266};
1267MODULE_DEVICE_TABLE(of, am65_cpts_of_match);
1268
1269static struct platform_driver am65_cpts_driver = {
1270 .probe = am65_cpts_probe,
1271 .driver = {
1272 .name = "am65-cpts",
1273 .of_match_table = am65_cpts_of_match,
1274 },
1275};
1276module_platform_driver(am65_cpts_driver);
1277
1278MODULE_LICENSE("GPL v2");
1279MODULE_AUTHOR("Grygorii Strashko <grygorii.strashko@ti.com>");
1280MODULE_DESCRIPTION("TI K3 AM65 CPTS driver");