1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * PTP 1588 clock for Freescale QorIQ 1588 timer
4 *
5 * Copyright (C) 2010 OMICRON electronics GmbH
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/device.h>
11 #include <linux/hrtimer.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/timex.h>
17 #include <linux/slab.h>
18 #include <linux/clk.h>
19
20 #include <linux/fsl/ptp_qoriq.h>
21
22 /*
23 * Register access functions
24 */
25
26 /* Caller must hold ptp_qoriq->lock. */
tmr_cnt_read(struct ptp_qoriq * ptp_qoriq)27 static u64 tmr_cnt_read(struct ptp_qoriq *ptp_qoriq)
28 {
29 struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
30 u64 ns;
31 u32 lo, hi;
32
33 lo = ptp_qoriq->read(®s->ctrl_regs->tmr_cnt_l);
34 hi = ptp_qoriq->read(®s->ctrl_regs->tmr_cnt_h);
35 ns = ((u64) hi) << 32;
36 ns |= lo;
37 return ns;
38 }
39
40 /* Caller must hold ptp_qoriq->lock. */
tmr_cnt_write(struct ptp_qoriq * ptp_qoriq,u64 ns)41 static void tmr_cnt_write(struct ptp_qoriq *ptp_qoriq, u64 ns)
42 {
43 struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
44 u32 hi = ns >> 32;
45 u32 lo = ns & 0xffffffff;
46
47 ptp_qoriq->write(®s->ctrl_regs->tmr_cnt_l, lo);
48 ptp_qoriq->write(®s->ctrl_regs->tmr_cnt_h, hi);
49 }
50
tmr_offset_read(struct ptp_qoriq * ptp_qoriq)51 static u64 tmr_offset_read(struct ptp_qoriq *ptp_qoriq)
52 {
53 struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
54 u32 lo, hi;
55 u64 ns;
56
57 lo = ptp_qoriq->read(®s->ctrl_regs->tmroff_l);
58 hi = ptp_qoriq->read(®s->ctrl_regs->tmroff_h);
59 ns = ((u64) hi) << 32;
60 ns |= lo;
61 return ns;
62 }
63
tmr_offset_write(struct ptp_qoriq * ptp_qoriq,u64 delta_ns)64 static void tmr_offset_write(struct ptp_qoriq *ptp_qoriq, u64 delta_ns)
65 {
66 struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
67 u32 lo = delta_ns & 0xffffffff;
68 u32 hi = delta_ns >> 32;
69
70 ptp_qoriq->write(®s->ctrl_regs->tmroff_l, lo);
71 ptp_qoriq->write(®s->ctrl_regs->tmroff_h, hi);
72 }
73
74 /* Caller must hold ptp_qoriq->lock. */
set_alarm(struct ptp_qoriq * ptp_qoriq)75 static void set_alarm(struct ptp_qoriq *ptp_qoriq)
76 {
77 struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
78 u64 ns;
79 u32 lo, hi;
80
81 ns = tmr_cnt_read(ptp_qoriq) + tmr_offset_read(ptp_qoriq)
82 + 1500000000ULL;
83
84 ns = div_u64(ns, 1000000000UL) * 1000000000ULL;
85 ns -= ptp_qoriq->tclk_period;
86 hi = ns >> 32;
87 lo = ns & 0xffffffff;
88 ptp_qoriq->write(®s->alarm_regs->tmr_alarm1_l, lo);
89 ptp_qoriq->write(®s->alarm_regs->tmr_alarm1_h, hi);
90 }
91
92 /* Caller must hold ptp_qoriq->lock. */
set_fipers(struct ptp_qoriq * ptp_qoriq)93 static void set_fipers(struct ptp_qoriq *ptp_qoriq)
94 {
95 struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
96
97 set_alarm(ptp_qoriq);
98 ptp_qoriq->write(®s->fiper_regs->tmr_fiper1, ptp_qoriq->tmr_fiper1);
99 ptp_qoriq->write(®s->fiper_regs->tmr_fiper2, ptp_qoriq->tmr_fiper2);
100
101 if (ptp_qoriq->fiper3_support)
102 ptp_qoriq->write(®s->fiper_regs->tmr_fiper3,
103 ptp_qoriq->tmr_fiper3);
104 }
105
extts_clean_up(struct ptp_qoriq * ptp_qoriq,int index,bool update_event)106 int extts_clean_up(struct ptp_qoriq *ptp_qoriq, int index, bool update_event)
107 {
108 struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
109 struct ptp_clock_event event;
110 void __iomem *reg_etts_l;
111 void __iomem *reg_etts_h;
112 u32 valid, lo, hi;
113
114 switch (index) {
115 case 0:
116 valid = ETS1_VLD;
117 reg_etts_l = ®s->etts_regs->tmr_etts1_l;
118 reg_etts_h = ®s->etts_regs->tmr_etts1_h;
119 break;
120 case 1:
121 valid = ETS2_VLD;
122 reg_etts_l = ®s->etts_regs->tmr_etts2_l;
123 reg_etts_h = ®s->etts_regs->tmr_etts2_h;
124 break;
125 default:
126 return -EINVAL;
127 }
128
129 event.type = PTP_CLOCK_EXTTS;
130 event.index = index;
131
132 if (ptp_qoriq->extts_fifo_support)
133 if (!(ptp_qoriq->read(®s->ctrl_regs->tmr_stat) & valid))
134 return 0;
135
136 do {
137 lo = ptp_qoriq->read(reg_etts_l);
138 hi = ptp_qoriq->read(reg_etts_h);
139
140 if (update_event) {
141 event.timestamp = ((u64) hi) << 32;
142 event.timestamp |= lo;
143 ptp_clock_event(ptp_qoriq->clock, &event);
144 }
145
146 if (!ptp_qoriq->extts_fifo_support)
147 break;
148 } while (ptp_qoriq->read(®s->ctrl_regs->tmr_stat) & valid);
149
150 return 0;
151 }
152 EXPORT_SYMBOL_GPL(extts_clean_up);
153
154 /*
155 * Interrupt service routine
156 */
157
ptp_qoriq_isr(int irq,void * priv)158 irqreturn_t ptp_qoriq_isr(int irq, void *priv)
159 {
160 struct ptp_qoriq *ptp_qoriq = priv;
161 struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
162 struct ptp_clock_event event;
163 u32 ack = 0, mask, val, irqs;
164
165 spin_lock(&ptp_qoriq->lock);
166
167 val = ptp_qoriq->read(®s->ctrl_regs->tmr_tevent);
168 mask = ptp_qoriq->read(®s->ctrl_regs->tmr_temask);
169
170 spin_unlock(&ptp_qoriq->lock);
171
172 irqs = val & mask;
173
174 if (irqs & ETS1) {
175 ack |= ETS1;
176 extts_clean_up(ptp_qoriq, 0, true);
177 }
178
179 if (irqs & ETS2) {
180 ack |= ETS2;
181 extts_clean_up(ptp_qoriq, 1, true);
182 }
183
184 if (irqs & PP1) {
185 ack |= PP1;
186 event.type = PTP_CLOCK_PPS;
187 ptp_clock_event(ptp_qoriq->clock, &event);
188 }
189
190 if (ack) {
191 ptp_qoriq->write(®s->ctrl_regs->tmr_tevent, ack);
192 return IRQ_HANDLED;
193 } else
194 return IRQ_NONE;
195 }
196 EXPORT_SYMBOL_GPL(ptp_qoriq_isr);
197
198 /*
199 * PTP clock operations
200 */
201
ptp_qoriq_adjfine(struct ptp_clock_info * ptp,long scaled_ppm)202 int ptp_qoriq_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
203 {
204 u64 adj, diff;
205 u32 tmr_add;
206 int neg_adj = 0;
207 struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
208 struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
209
210 if (scaled_ppm < 0) {
211 neg_adj = 1;
212 scaled_ppm = -scaled_ppm;
213 }
214 tmr_add = ptp_qoriq->tmr_add;
215 adj = tmr_add;
216
217 /*
218 * Calculate diff and round() to the nearest integer
219 *
220 * diff = adj * (ppb / 1000000000)
221 * = adj * scaled_ppm / 65536000000
222 */
223 diff = mul_u64_u64_div_u64(adj, scaled_ppm, 32768000000);
224 diff = DIV64_U64_ROUND_UP(diff, 2);
225
226 tmr_add = neg_adj ? tmr_add - diff : tmr_add + diff;
227 ptp_qoriq->write(®s->ctrl_regs->tmr_add, tmr_add);
228
229 return 0;
230 }
231 EXPORT_SYMBOL_GPL(ptp_qoriq_adjfine);
232
ptp_qoriq_adjtime(struct ptp_clock_info * ptp,s64 delta)233 int ptp_qoriq_adjtime(struct ptp_clock_info *ptp, s64 delta)
234 {
235 struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
236 s64 now, curr_delta;
237 unsigned long flags;
238
239 spin_lock_irqsave(&ptp_qoriq->lock, flags);
240
241 /* On LS1021A, eTSEC2 and eTSEC3 do not take into account the TMR_OFF
242 * adjustment
243 */
244 if (ptp_qoriq->etsec) {
245 now = tmr_cnt_read(ptp_qoriq);
246 now += delta;
247 tmr_cnt_write(ptp_qoriq, now);
248 } else {
249 curr_delta = tmr_offset_read(ptp_qoriq);
250 curr_delta += delta;
251 tmr_offset_write(ptp_qoriq, curr_delta);
252 }
253 set_fipers(ptp_qoriq);
254
255 spin_unlock_irqrestore(&ptp_qoriq->lock, flags);
256
257 return 0;
258 }
259 EXPORT_SYMBOL_GPL(ptp_qoriq_adjtime);
260
ptp_qoriq_gettime(struct ptp_clock_info * ptp,struct timespec64 * ts)261 int ptp_qoriq_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
262 {
263 u64 ns;
264 unsigned long flags;
265 struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
266
267 spin_lock_irqsave(&ptp_qoriq->lock, flags);
268
269 ns = tmr_cnt_read(ptp_qoriq) + tmr_offset_read(ptp_qoriq);
270
271 spin_unlock_irqrestore(&ptp_qoriq->lock, flags);
272
273 *ts = ns_to_timespec64(ns);
274
275 return 0;
276 }
277 EXPORT_SYMBOL_GPL(ptp_qoriq_gettime);
278
ptp_qoriq_settime(struct ptp_clock_info * ptp,const struct timespec64 * ts)279 int ptp_qoriq_settime(struct ptp_clock_info *ptp,
280 const struct timespec64 *ts)
281 {
282 u64 ns;
283 unsigned long flags;
284 struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
285
286 ns = timespec64_to_ns(ts);
287
288 spin_lock_irqsave(&ptp_qoriq->lock, flags);
289
290 tmr_offset_write(ptp_qoriq, 0);
291 tmr_cnt_write(ptp_qoriq, ns);
292 set_fipers(ptp_qoriq);
293
294 spin_unlock_irqrestore(&ptp_qoriq->lock, flags);
295
296 return 0;
297 }
298 EXPORT_SYMBOL_GPL(ptp_qoriq_settime);
299
ptp_qoriq_enable(struct ptp_clock_info * ptp,struct ptp_clock_request * rq,int on)300 int ptp_qoriq_enable(struct ptp_clock_info *ptp,
301 struct ptp_clock_request *rq, int on)
302 {
303 struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
304 struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
305 unsigned long flags;
306 u32 bit, mask = 0;
307
308 switch (rq->type) {
309 case PTP_CLK_REQ_EXTTS:
310 switch (rq->extts.index) {
311 case 0:
312 bit = ETS1EN;
313 break;
314 case 1:
315 bit = ETS2EN;
316 break;
317 default:
318 return -EINVAL;
319 }
320
321 if (on)
322 extts_clean_up(ptp_qoriq, rq->extts.index, false);
323
324 break;
325 case PTP_CLK_REQ_PPS:
326 bit = PP1EN;
327 break;
328 default:
329 return -EOPNOTSUPP;
330 }
331
332 spin_lock_irqsave(&ptp_qoriq->lock, flags);
333
334 mask = ptp_qoriq->read(®s->ctrl_regs->tmr_temask);
335 if (on) {
336 mask |= bit;
337 ptp_qoriq->write(®s->ctrl_regs->tmr_tevent, bit);
338 } else {
339 mask &= ~bit;
340 }
341
342 ptp_qoriq->write(®s->ctrl_regs->tmr_temask, mask);
343
344 spin_unlock_irqrestore(&ptp_qoriq->lock, flags);
345 return 0;
346 }
347 EXPORT_SYMBOL_GPL(ptp_qoriq_enable);
348
349 static const struct ptp_clock_info ptp_qoriq_caps = {
350 .owner = THIS_MODULE,
351 .name = "qoriq ptp clock",
352 .max_adj = 512000,
353 .n_alarm = 0,
354 .n_ext_ts = N_EXT_TS,
355 .n_per_out = 0,
356 .n_pins = 0,
357 .pps = 1,
358 .adjfine = ptp_qoriq_adjfine,
359 .adjtime = ptp_qoriq_adjtime,
360 .gettime64 = ptp_qoriq_gettime,
361 .settime64 = ptp_qoriq_settime,
362 .enable = ptp_qoriq_enable,
363 };
364
365 /**
366 * ptp_qoriq_nominal_freq - calculate nominal frequency according to
367 * reference clock frequency
368 *
369 * @clk_src: reference clock frequency
370 *
371 * The nominal frequency is the desired clock frequency.
372 * It should be less than the reference clock frequency.
373 * It should be a factor of 1000MHz.
374 *
375 * Return the nominal frequency
376 */
ptp_qoriq_nominal_freq(u32 clk_src)377 static u32 ptp_qoriq_nominal_freq(u32 clk_src)
378 {
379 u32 remainder = 0;
380
381 clk_src /= 1000000;
382 remainder = clk_src % 100;
383 if (remainder) {
384 clk_src -= remainder;
385 clk_src += 100;
386 }
387
388 do {
389 clk_src -= 100;
390
391 } while (1000 % clk_src);
392
393 return clk_src * 1000000;
394 }
395
396 /**
397 * ptp_qoriq_auto_config - calculate a set of default configurations
398 *
399 * @ptp_qoriq: pointer to ptp_qoriq
400 * @node: pointer to device_node
401 *
402 * If below dts properties are not provided, this function will be
403 * called to calculate a set of default configurations for them.
404 * "fsl,tclk-period"
405 * "fsl,tmr-prsc"
406 * "fsl,tmr-add"
407 * "fsl,tmr-fiper1"
408 * "fsl,tmr-fiper2"
409 * "fsl,tmr-fiper3" (required only for DPAA2 and ENETC hardware)
410 * "fsl,max-adj"
411 *
412 * Return 0 if success
413 */
ptp_qoriq_auto_config(struct ptp_qoriq * ptp_qoriq,struct device_node * node)414 static int ptp_qoriq_auto_config(struct ptp_qoriq *ptp_qoriq,
415 struct device_node *node)
416 {
417 struct clk *clk;
418 u64 freq_comp;
419 u64 max_adj;
420 u32 nominal_freq;
421 u32 remainder = 0;
422 u32 clk_src = 0;
423
424 ptp_qoriq->cksel = DEFAULT_CKSEL;
425
426 clk = of_clk_get(node, 0);
427 if (!IS_ERR(clk)) {
428 clk_src = clk_get_rate(clk);
429 clk_put(clk);
430 }
431
432 if (clk_src <= 100000000UL) {
433 pr_err("error reference clock value, or lower than 100MHz\n");
434 return -EINVAL;
435 }
436
437 nominal_freq = ptp_qoriq_nominal_freq(clk_src);
438 if (!nominal_freq)
439 return -EINVAL;
440
441 ptp_qoriq->tclk_period = 1000000000UL / nominal_freq;
442 ptp_qoriq->tmr_prsc = DEFAULT_TMR_PRSC;
443
444 /* Calculate initial frequency compensation value for TMR_ADD register.
445 * freq_comp = ceil(2^32 / freq_ratio)
446 * freq_ratio = reference_clock_freq / nominal_freq
447 */
448 freq_comp = ((u64)1 << 32) * nominal_freq;
449 freq_comp = div_u64_rem(freq_comp, clk_src, &remainder);
450 if (remainder)
451 freq_comp++;
452
453 ptp_qoriq->tmr_add = freq_comp;
454 ptp_qoriq->tmr_fiper1 = DEFAULT_FIPER1_PERIOD - ptp_qoriq->tclk_period;
455 ptp_qoriq->tmr_fiper2 = DEFAULT_FIPER2_PERIOD - ptp_qoriq->tclk_period;
456 ptp_qoriq->tmr_fiper3 = DEFAULT_FIPER3_PERIOD - ptp_qoriq->tclk_period;
457
458 /* max_adj = 1000000000 * (freq_ratio - 1.0) - 1
459 * freq_ratio = reference_clock_freq / nominal_freq
460 */
461 max_adj = 1000000000ULL * (clk_src - nominal_freq);
462 max_adj = div_u64(max_adj, nominal_freq) - 1;
463 ptp_qoriq->caps.max_adj = max_adj;
464
465 return 0;
466 }
467
ptp_qoriq_init(struct ptp_qoriq * ptp_qoriq,void __iomem * base,const struct ptp_clock_info * caps)468 int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq, void __iomem *base,
469 const struct ptp_clock_info *caps)
470 {
471 struct device_node *node = ptp_qoriq->dev->of_node;
472 struct ptp_qoriq_registers *regs;
473 struct timespec64 now;
474 unsigned long flags;
475 u32 tmr_ctrl;
476
477 if (!node)
478 return -ENODEV;
479
480 ptp_qoriq->base = base;
481 ptp_qoriq->caps = *caps;
482
483 if (of_property_read_u32(node, "fsl,cksel", &ptp_qoriq->cksel))
484 ptp_qoriq->cksel = DEFAULT_CKSEL;
485
486 if (of_property_read_bool(node, "fsl,extts-fifo"))
487 ptp_qoriq->extts_fifo_support = true;
488 else
489 ptp_qoriq->extts_fifo_support = false;
490
491 if (of_device_is_compatible(node, "fsl,dpaa2-ptp") ||
492 of_device_is_compatible(node, "fsl,enetc-ptp"))
493 ptp_qoriq->fiper3_support = true;
494
495 if (of_property_read_u32(node,
496 "fsl,tclk-period", &ptp_qoriq->tclk_period) ||
497 of_property_read_u32(node,
498 "fsl,tmr-prsc", &ptp_qoriq->tmr_prsc) ||
499 of_property_read_u32(node,
500 "fsl,tmr-add", &ptp_qoriq->tmr_add) ||
501 of_property_read_u32(node,
502 "fsl,tmr-fiper1", &ptp_qoriq->tmr_fiper1) ||
503 of_property_read_u32(node,
504 "fsl,tmr-fiper2", &ptp_qoriq->tmr_fiper2) ||
505 of_property_read_u32(node,
506 "fsl,max-adj", &ptp_qoriq->caps.max_adj) ||
507 (ptp_qoriq->fiper3_support &&
508 of_property_read_u32(node, "fsl,tmr-fiper3",
509 &ptp_qoriq->tmr_fiper3))) {
510 pr_warn("device tree node missing required elements, try automatic configuration\n");
511
512 if (ptp_qoriq_auto_config(ptp_qoriq, node))
513 return -ENODEV;
514 }
515
516 if (of_property_read_bool(node, "little-endian")) {
517 ptp_qoriq->read = qoriq_read_le;
518 ptp_qoriq->write = qoriq_write_le;
519 } else {
520 ptp_qoriq->read = qoriq_read_be;
521 ptp_qoriq->write = qoriq_write_be;
522 }
523
524 /* The eTSEC uses differnt memory map with DPAA/ENETC */
525 if (of_device_is_compatible(node, "fsl,etsec-ptp")) {
526 ptp_qoriq->etsec = true;
527 ptp_qoriq->regs.ctrl_regs = base + ETSEC_CTRL_REGS_OFFSET;
528 ptp_qoriq->regs.alarm_regs = base + ETSEC_ALARM_REGS_OFFSET;
529 ptp_qoriq->regs.fiper_regs = base + ETSEC_FIPER_REGS_OFFSET;
530 ptp_qoriq->regs.etts_regs = base + ETSEC_ETTS_REGS_OFFSET;
531 } else {
532 ptp_qoriq->regs.ctrl_regs = base + CTRL_REGS_OFFSET;
533 ptp_qoriq->regs.alarm_regs = base + ALARM_REGS_OFFSET;
534 ptp_qoriq->regs.fiper_regs = base + FIPER_REGS_OFFSET;
535 ptp_qoriq->regs.etts_regs = base + ETTS_REGS_OFFSET;
536 }
537
538 spin_lock_init(&ptp_qoriq->lock);
539
540 ktime_get_real_ts64(&now);
541 ptp_qoriq_settime(&ptp_qoriq->caps, &now);
542
543 tmr_ctrl =
544 (ptp_qoriq->tclk_period & TCLK_PERIOD_MASK) << TCLK_PERIOD_SHIFT |
545 (ptp_qoriq->cksel & CKSEL_MASK) << CKSEL_SHIFT;
546
547 spin_lock_irqsave(&ptp_qoriq->lock, flags);
548
549 regs = &ptp_qoriq->regs;
550 ptp_qoriq->write(®s->ctrl_regs->tmr_ctrl, tmr_ctrl);
551 ptp_qoriq->write(®s->ctrl_regs->tmr_add, ptp_qoriq->tmr_add);
552 ptp_qoriq->write(®s->ctrl_regs->tmr_prsc, ptp_qoriq->tmr_prsc);
553 ptp_qoriq->write(®s->fiper_regs->tmr_fiper1, ptp_qoriq->tmr_fiper1);
554 ptp_qoriq->write(®s->fiper_regs->tmr_fiper2, ptp_qoriq->tmr_fiper2);
555
556 if (ptp_qoriq->fiper3_support)
557 ptp_qoriq->write(®s->fiper_regs->tmr_fiper3,
558 ptp_qoriq->tmr_fiper3);
559
560 set_alarm(ptp_qoriq);
561 ptp_qoriq->write(®s->ctrl_regs->tmr_ctrl,
562 tmr_ctrl|FIPERST|RTPE|TE|FRD);
563
564 spin_unlock_irqrestore(&ptp_qoriq->lock, flags);
565
566 ptp_qoriq->clock = ptp_clock_register(&ptp_qoriq->caps, ptp_qoriq->dev);
567 if (IS_ERR(ptp_qoriq->clock))
568 return PTR_ERR(ptp_qoriq->clock);
569
570 ptp_qoriq->phc_index = ptp_clock_index(ptp_qoriq->clock);
571 ptp_qoriq_create_debugfs(ptp_qoriq);
572 return 0;
573 }
574 EXPORT_SYMBOL_GPL(ptp_qoriq_init);
575
ptp_qoriq_free(struct ptp_qoriq * ptp_qoriq)576 void ptp_qoriq_free(struct ptp_qoriq *ptp_qoriq)
577 {
578 struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
579
580 ptp_qoriq->write(®s->ctrl_regs->tmr_temask, 0);
581 ptp_qoriq->write(®s->ctrl_regs->tmr_ctrl, 0);
582
583 ptp_qoriq_remove_debugfs(ptp_qoriq);
584 ptp_clock_unregister(ptp_qoriq->clock);
585 iounmap(ptp_qoriq->base);
586 free_irq(ptp_qoriq->irq, ptp_qoriq);
587 }
588 EXPORT_SYMBOL_GPL(ptp_qoriq_free);
589
ptp_qoriq_probe(struct platform_device * dev)590 static int ptp_qoriq_probe(struct platform_device *dev)
591 {
592 struct ptp_qoriq *ptp_qoriq;
593 int err = -ENOMEM;
594 void __iomem *base;
595
596 ptp_qoriq = kzalloc(sizeof(*ptp_qoriq), GFP_KERNEL);
597 if (!ptp_qoriq)
598 goto no_memory;
599
600 ptp_qoriq->dev = &dev->dev;
601
602 err = -ENODEV;
603
604 ptp_qoriq->irq = platform_get_irq(dev, 0);
605 if (ptp_qoriq->irq < 0) {
606 pr_err("irq not in device tree\n");
607 goto no_node;
608 }
609 if (request_irq(ptp_qoriq->irq, ptp_qoriq_isr, IRQF_SHARED,
610 DRIVER, ptp_qoriq)) {
611 pr_err("request_irq failed\n");
612 goto no_node;
613 }
614
615 ptp_qoriq->rsrc = platform_get_resource(dev, IORESOURCE_MEM, 0);
616 if (!ptp_qoriq->rsrc) {
617 pr_err("no resource\n");
618 goto no_resource;
619 }
620 if (request_resource(&iomem_resource, ptp_qoriq->rsrc)) {
621 pr_err("resource busy\n");
622 goto no_resource;
623 }
624
625 base = ioremap(ptp_qoriq->rsrc->start,
626 resource_size(ptp_qoriq->rsrc));
627 if (!base) {
628 pr_err("ioremap ptp registers failed\n");
629 goto no_ioremap;
630 }
631
632 err = ptp_qoriq_init(ptp_qoriq, base, &ptp_qoriq_caps);
633 if (err)
634 goto no_clock;
635
636 platform_set_drvdata(dev, ptp_qoriq);
637 return 0;
638
639 no_clock:
640 iounmap(base);
641 no_ioremap:
642 release_resource(ptp_qoriq->rsrc);
643 no_resource:
644 free_irq(ptp_qoriq->irq, ptp_qoriq);
645 no_node:
646 kfree(ptp_qoriq);
647 no_memory:
648 return err;
649 }
650
ptp_qoriq_remove(struct platform_device * dev)651 static int ptp_qoriq_remove(struct platform_device *dev)
652 {
653 struct ptp_qoriq *ptp_qoriq = platform_get_drvdata(dev);
654
655 ptp_qoriq_free(ptp_qoriq);
656 release_resource(ptp_qoriq->rsrc);
657 kfree(ptp_qoriq);
658 return 0;
659 }
660
661 static const struct of_device_id match_table[] = {
662 { .compatible = "fsl,etsec-ptp" },
663 { .compatible = "fsl,fman-ptp-timer" },
664 {},
665 };
666 MODULE_DEVICE_TABLE(of, match_table);
667
668 static struct platform_driver ptp_qoriq_driver = {
669 .driver = {
670 .name = "ptp_qoriq",
671 .of_match_table = match_table,
672 },
673 .probe = ptp_qoriq_probe,
674 .remove = ptp_qoriq_remove,
675 };
676
677 module_platform_driver(ptp_qoriq_driver);
678
679 MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
680 MODULE_DESCRIPTION("PTP clock for Freescale QorIQ 1588 timer");
681 MODULE_LICENSE("GPL");
682