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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / clk / renesas / rcar-gen3-cpg.c
blob063b6115148869aa014216343cfa06407a30b77b
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * R-Car Gen3 Clock Pulse Generator
4 *
5 * Copyright (C) 2015-2018 Glider bvba
6 * Copyright (C) 2019 Renesas Electronics Corp.
7 *
8 * Based on clk-rcar-gen3.c
9 *
10 * Copyright (C) 2015 Renesas Electronics Corp.
11 */
12
13 #include <linux/bug.h>
14 #include <linux/bitfield.h>
15 #include <linux/clk.h>
16 #include <linux/clk-provider.h>
17 #include <linux/device.h>
18 #include <linux/err.h>
19 #include <linux/init.h>
20 #include <linux/io.h>
21 #include <linux/pm.h>
22 #include <linux/slab.h>
23 #include <linux/sys_soc.h>
24
25 #include "renesas-cpg-mssr.h"
26 #include "rcar-gen3-cpg.h"
27
28 #define CPG_PLL0CR 0x00d8
29 #define CPG_PLL2CR 0x002c
30 #define CPG_PLL4CR 0x01f4
31
32 #define CPG_RCKCR_CKSEL BIT(15) /* RCLK Clock Source Select */
33
34 static spinlock_t cpg_lock;
35
36 static void cpg_reg_modify(void __iomem *reg, u32 clear, u32 set)
37 {
38 unsigned long flags;
39 u32 val;
40
41 spin_lock_irqsave(&cpg_lock, flags);
42 val = readl(reg);
43 val &= ~clear;
44 val |= set;
45 writel(val, reg);
46 spin_unlock_irqrestore(&cpg_lock, flags);
47 };
48
49 struct cpg_simple_notifier {
50 struct notifier_block nb;
51 void __iomem *reg;
52 u32 saved;
53 };
54
55 static int cpg_simple_notifier_call(struct notifier_block *nb,
56 unsigned long action, void *data)
57 {
58 struct cpg_simple_notifier *csn =
59 container_of(nb, struct cpg_simple_notifier, nb);
60
61 switch (action) {
62 case PM_EVENT_SUSPEND:
63 csn->saved = readl(csn->reg);
64 return NOTIFY_OK;
65
66 case PM_EVENT_RESUME:
67 writel(csn->saved, csn->reg);
68 return NOTIFY_OK;
69 }
70 return NOTIFY_DONE;
71 }
72
73 static void cpg_simple_notifier_register(struct raw_notifier_head *notifiers,
74 struct cpg_simple_notifier *csn)
75 {
76 csn->nb.notifier_call = cpg_simple_notifier_call;
77 raw_notifier_chain_register(notifiers, &csn->nb);
78 }
79
80 /*
81 * Z Clock & Z2 Clock
82 *
83 * Traits of this clock:
84 * prepare - clk_prepare only ensures that parents are prepared
85 * enable - clk_enable only ensures that parents are enabled
86 * rate - rate is adjustable. clk->rate = (parent->rate * mult / 32 ) / 2
87 * parent - fixed parent. No clk_set_parent support
88 */
89 #define CPG_FRQCRB 0x00000004
90 #define CPG_FRQCRB_KICK BIT(31)
91 #define CPG_FRQCRC 0x000000e0
92
93 struct cpg_z_clk {
94 struct clk_hw hw;
95 void __iomem *reg;
96 void __iomem *kick_reg;
97 unsigned long mask;
98 unsigned int fixed_div;
99 };
100
101 #define to_z_clk(_hw) container_of(_hw, struct cpg_z_clk, hw)
102
103 static unsigned long cpg_z_clk_recalc_rate(struct clk_hw *hw,
104 unsigned long parent_rate)
105 {
106 struct cpg_z_clk *zclk = to_z_clk(hw);
107 unsigned int mult;
108 u32 val;
109
110 val = readl(zclk->reg) & zclk->mask;
111 mult = 32 - (val >> __ffs(zclk->mask));
112
113 return DIV_ROUND_CLOSEST_ULL((u64)parent_rate * mult,
114 32 * zclk->fixed_div);
115 }
116
117 static int cpg_z_clk_determine_rate(struct clk_hw *hw,
118 struct clk_rate_request *req)
119 {
120 struct cpg_z_clk *zclk = to_z_clk(hw);
121 unsigned int min_mult, max_mult, mult;
122 unsigned long prate;
123
124 prate = req->best_parent_rate / zclk->fixed_div;
125 min_mult = max(div64_ul(req->min_rate * 32ULL, prate), 1ULL);
126 max_mult = min(div64_ul(req->max_rate * 32ULL, prate), 32ULL);
127 if (max_mult < min_mult)
128 return -EINVAL;
129
130 mult = div64_ul(req->rate * 32ULL, prate);
131 mult = clamp(mult, min_mult, max_mult);
132
133 req->rate = div_u64((u64)prate * mult, 32);
134 return 0;
135 }
136
137 static int cpg_z_clk_set_rate(struct clk_hw *hw, unsigned long rate,
138 unsigned long parent_rate)
139 {
140 struct cpg_z_clk *zclk = to_z_clk(hw);
141 unsigned int mult;
142 unsigned int i;
143
144 mult = DIV64_U64_ROUND_CLOSEST(rate * 32ULL * zclk->fixed_div,
145 parent_rate);
146 mult = clamp(mult, 1U, 32U);
147
148 if (readl(zclk->kick_reg) & CPG_FRQCRB_KICK)
149 return -EBUSY;
150
151 cpg_reg_modify(zclk->reg, zclk->mask,
152 ((32 - mult) << __ffs(zclk->mask)) & zclk->mask);
153
154 /*
155 * Set KICK bit in FRQCRB to update hardware setting and wait for
156 * clock change completion.
157 */
158 cpg_reg_modify(zclk->kick_reg, 0, CPG_FRQCRB_KICK);
159
160 /*
161 * Note: There is no HW information about the worst case latency.
162 *
163 * Using experimental measurements, it seems that no more than
164 * ~10 iterations are needed, independently of the CPU rate.
165 * Since this value might be dependent of external xtal rate, pll1
166 * rate or even the other emulation clocks rate, use 1000 as a
167 * "super" safe value.
168 */
169 for (i = 1000; i; i--) {
170 if (!(readl(zclk->kick_reg) & CPG_FRQCRB_KICK))
171 return 0;
172
173 cpu_relax();
174 }
175
176 return -ETIMEDOUT;
177 }
178
179 static const struct clk_ops cpg_z_clk_ops = {
180 .recalc_rate = cpg_z_clk_recalc_rate,
181 .determine_rate = cpg_z_clk_determine_rate,
182 .set_rate = cpg_z_clk_set_rate,
183 };
184
185 static struct clk * __init cpg_z_clk_register(const char *name,
186 const char *parent_name,
187 void __iomem *reg,
188 unsigned int div,
189 unsigned int offset)
190 {
191 struct clk_init_data init;
192 struct cpg_z_clk *zclk;
193 struct clk *clk;
194
195 zclk = kzalloc(sizeof(*zclk), GFP_KERNEL);
196 if (!zclk)
197 return ERR_PTR(-ENOMEM);
198
199 init.name = name;
200 init.ops = &cpg_z_clk_ops;
201 init.flags = 0;
202 init.parent_names = &parent_name;
203 init.num_parents = 1;
204
205 zclk->reg = reg + CPG_FRQCRC;
206 zclk->kick_reg = reg + CPG_FRQCRB;
207 zclk->hw.init = &init;
208 zclk->mask = GENMASK(offset + 4, offset);
209 zclk->fixed_div = div; /* PLLVCO x 1/div x SYS-CPU divider */
210
211 clk = clk_register(NULL, &zclk->hw);
212 if (IS_ERR(clk))
213 kfree(zclk);
214
215 return clk;
216 }
217
218 /*
219 * SDn Clock
220 */
221 #define CPG_SD_STP_HCK BIT(9)
222 #define CPG_SD_STP_CK BIT(8)
223
224 #define CPG_SD_STP_MASK (CPG_SD_STP_HCK | CPG_SD_STP_CK)
225 #define CPG_SD_FC_MASK (0x7 << 2 | 0x3 << 0)
226
227 #define CPG_SD_DIV_TABLE_DATA(stp_hck, sd_srcfc, sd_fc, sd_div) \
228 { \
229 .val = ((stp_hck) ? CPG_SD_STP_HCK : 0) | \
230 ((sd_srcfc) << 2) | \
231 ((sd_fc) << 0), \
232 .div = (sd_div), \
233 }
234
235 struct sd_div_table {
236 u32 val;
237 unsigned int div;
238 };
239
240 struct sd_clock {
241 struct clk_hw hw;
242 const struct sd_div_table *div_table;
243 struct cpg_simple_notifier csn;
244 unsigned int div_num;
245 unsigned int cur_div_idx;
246 };
247
248 /* SDn divider
249 * sd_srcfc sd_fc div
250 * stp_hck (div) (div) = sd_srcfc x sd_fc
251 *---------------------------------------------------------
252 * 0 0 (1) 1 (4) 4 : SDR104 / HS200 / HS400 (8 TAP)
253 * 0 1 (2) 1 (4) 8 : SDR50
254 * 1 2 (4) 1 (4) 16 : HS / SDR25
255 * 1 3 (8) 1 (4) 32 : NS / SDR12
256 * 1 4 (16) 1 (4) 64
257 * 0 0 (1) 0 (2) 2
258 * 0 1 (2) 0 (2) 4 : SDR104 / HS200 / HS400 (4 TAP)
259 * 1 2 (4) 0 (2) 8
260 * 1 3 (8) 0 (2) 16
261 * 1 4 (16) 0 (2) 32
262 *
263 * NOTE: There is a quirk option to ignore the first row of the dividers
264 * table when searching for suitable settings. This is because HS400 on
265 * early ES versions of H3 and M3-W requires a specific setting to work.
266 */
267 static const struct sd_div_table cpg_sd_div_table[] = {
268 /* CPG_SD_DIV_TABLE_DATA(stp_hck, sd_srcfc, sd_fc, sd_div) */
269 CPG_SD_DIV_TABLE_DATA(0, 0, 1, 4),
270 CPG_SD_DIV_TABLE_DATA(0, 1, 1, 8),
271 CPG_SD_DIV_TABLE_DATA(1, 2, 1, 16),
272 CPG_SD_DIV_TABLE_DATA(1, 3, 1, 32),
273 CPG_SD_DIV_TABLE_DATA(1, 4, 1, 64),
274 CPG_SD_DIV_TABLE_DATA(0, 0, 0, 2),
275 CPG_SD_DIV_TABLE_DATA(0, 1, 0, 4),
276 CPG_SD_DIV_TABLE_DATA(1, 2, 0, 8),
277 CPG_SD_DIV_TABLE_DATA(1, 3, 0, 16),
278 CPG_SD_DIV_TABLE_DATA(1, 4, 0, 32),
279 };
280
281 #define to_sd_clock(_hw) container_of(_hw, struct sd_clock, hw)
282
283 static int cpg_sd_clock_enable(struct clk_hw *hw)
284 {
285 struct sd_clock *clock = to_sd_clock(hw);
286
287 cpg_reg_modify(clock->csn.reg, CPG_SD_STP_MASK,
288 clock->div_table[clock->cur_div_idx].val &
289 CPG_SD_STP_MASK);
290
291 return 0;
292 }
293
294 static void cpg_sd_clock_disable(struct clk_hw *hw)
295 {
296 struct sd_clock *clock = to_sd_clock(hw);
297
298 cpg_reg_modify(clock->csn.reg, 0, CPG_SD_STP_MASK);
299 }
300
301 static int cpg_sd_clock_is_enabled(struct clk_hw *hw)
302 {
303 struct sd_clock *clock = to_sd_clock(hw);
304
305 return !(readl(clock->csn.reg) & CPG_SD_STP_MASK);
306 }
307
308 static unsigned long cpg_sd_clock_recalc_rate(struct clk_hw *hw,
309 unsigned long parent_rate)
310 {
311 struct sd_clock *clock = to_sd_clock(hw);
312
313 return DIV_ROUND_CLOSEST(parent_rate,
314 clock->div_table[clock->cur_div_idx].div);
315 }
316
317 static int cpg_sd_clock_determine_rate(struct clk_hw *hw,
318 struct clk_rate_request *req)
319 {
320 unsigned long best_rate = ULONG_MAX, diff_min = ULONG_MAX;
321 struct sd_clock *clock = to_sd_clock(hw);
322 unsigned long calc_rate, diff;
323 unsigned int i;
324
325 for (i = 0; i < clock->div_num; i++) {
326 calc_rate = DIV_ROUND_CLOSEST(req->best_parent_rate,
327 clock->div_table[i].div);
328 if (calc_rate < req->min_rate || calc_rate > req->max_rate)
329 continue;
330
331 diff = calc_rate > req->rate ? calc_rate - req->rate
332 : req->rate - calc_rate;
333 if (diff < diff_min) {
334 best_rate = calc_rate;
335 diff_min = diff;
336 }
337 }
338
339 if (best_rate == ULONG_MAX)
340 return -EINVAL;
341
342 req->rate = best_rate;
343 return 0;
344 }
345
346 static int cpg_sd_clock_set_rate(struct clk_hw *hw, unsigned long rate,
347 unsigned long parent_rate)
348 {
349 struct sd_clock *clock = to_sd_clock(hw);
350 unsigned int i;
351
352 for (i = 0; i < clock->div_num; i++)
353 if (rate == DIV_ROUND_CLOSEST(parent_rate,
354 clock->div_table[i].div))
355 break;
356
357 if (i >= clock->div_num)
358 return -EINVAL;
359
360 clock->cur_div_idx = i;
361
362 cpg_reg_modify(clock->csn.reg, CPG_SD_STP_MASK | CPG_SD_FC_MASK,
363 clock->div_table[i].val &
364 (CPG_SD_STP_MASK | CPG_SD_FC_MASK));
365
366 return 0;
367 }
368
369 static const struct clk_ops cpg_sd_clock_ops = {
370 .enable = cpg_sd_clock_enable,
371 .disable = cpg_sd_clock_disable,
372 .is_enabled = cpg_sd_clock_is_enabled,
373 .recalc_rate = cpg_sd_clock_recalc_rate,
374 .determine_rate = cpg_sd_clock_determine_rate,
375 .set_rate = cpg_sd_clock_set_rate,
376 };
377
378 static u32 cpg_quirks __initdata;
379
380 #define PLL_ERRATA BIT(0) /* Missing PLL0/2/4 post-divider */
381 #define RCKCR_CKSEL BIT(1) /* Manual RCLK parent selection */
382 #define SD_SKIP_FIRST BIT(2) /* Skip first clock in SD table */
383
384 static struct clk * __init cpg_sd_clk_register(const char *name,
385 void __iomem *base, unsigned int offset, const char *parent_name,
386 struct raw_notifier_head *notifiers)
387 {
388 struct clk_init_data init;
389 struct sd_clock *clock;
390 struct clk *clk;
391 u32 val;
392
393 clock = kzalloc(sizeof(*clock), GFP_KERNEL);
394 if (!clock)
395 return ERR_PTR(-ENOMEM);
396
397 init.name = name;
398 init.ops = &cpg_sd_clock_ops;
399 init.flags = CLK_SET_RATE_PARENT;
400 init.parent_names = &parent_name;
401 init.num_parents = 1;
402
403 clock->csn.reg = base + offset;
404 clock->hw.init = &init;
405 clock->div_table = cpg_sd_div_table;
406 clock->div_num = ARRAY_SIZE(cpg_sd_div_table);
407
408 if (cpg_quirks & SD_SKIP_FIRST) {
409 clock->div_table++;
410 clock->div_num--;
411 }
412
413 val = readl(clock->csn.reg) & ~CPG_SD_FC_MASK;
414 val |= CPG_SD_STP_MASK | (clock->div_table[0].val & CPG_SD_FC_MASK);
415 writel(val, clock->csn.reg);
416
417 clk = clk_register(NULL, &clock->hw);
418 if (IS_ERR(clk))
419 goto free_clock;
420
421 cpg_simple_notifier_register(notifiers, &clock->csn);
422 return clk;
423
424 free_clock:
425 kfree(clock);
426 return clk;
427 }
428
429 struct rpc_clock {
430 struct clk_divider div;
431 struct clk_gate gate;
432 /*
433 * One notifier covers both RPC and RPCD2 clocks as they are both
434 * controlled by the same RPCCKCR register...
435 */
436 struct cpg_simple_notifier csn;
437 };
438
439 static const struct clk_div_table cpg_rpcsrc_div_table[] = {
440 { 2, 5 }, { 3, 6 }, { 0, 0 },
441 };
442
443 static const struct clk_div_table cpg_rpc_div_table[] = {
444 { 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 }, { 0, 0 },
445 };
446
447 static struct clk * __init cpg_rpc_clk_register(const char *name,
448 void __iomem *base, const char *parent_name,
449 struct raw_notifier_head *notifiers)
450 {
451 struct rpc_clock *rpc;
452 struct clk *clk;
453
454 rpc = kzalloc(sizeof(*rpc), GFP_KERNEL);
455 if (!rpc)
456 return ERR_PTR(-ENOMEM);
457
458 rpc->div.reg = base + CPG_RPCCKCR;
459 rpc->div.width = 3;
460 rpc->div.table = cpg_rpc_div_table;
461 rpc->div.lock = &cpg_lock;
462
463 rpc->gate.reg = base + CPG_RPCCKCR;
464 rpc->gate.bit_idx = 8;
465 rpc->gate.flags = CLK_GATE_SET_TO_DISABLE;
466 rpc->gate.lock = &cpg_lock;
467
468 rpc->csn.reg = base + CPG_RPCCKCR;
469
470 clk = clk_register_composite(NULL, name, &parent_name, 1, NULL, NULL,
471 &rpc->div.hw, &clk_divider_ops,
472 &rpc->gate.hw, &clk_gate_ops,
473 CLK_SET_RATE_PARENT);
474 if (IS_ERR(clk)) {
475 kfree(rpc);
476 return clk;
477 }
478
479 cpg_simple_notifier_register(notifiers, &rpc->csn);
480 return clk;
481 }
482
483 struct rpcd2_clock {
484 struct clk_fixed_factor fixed;
485 struct clk_gate gate;
486 };
487
488 static struct clk * __init cpg_rpcd2_clk_register(const char *name,
489 void __iomem *base,
490 const char *parent_name)
491 {
492 struct rpcd2_clock *rpcd2;
493 struct clk *clk;
494
495 rpcd2 = kzalloc(sizeof(*rpcd2), GFP_KERNEL);
496 if (!rpcd2)
497 return ERR_PTR(-ENOMEM);
498
499 rpcd2->fixed.mult = 1;
500 rpcd2->fixed.div = 2;
501
502 rpcd2->gate.reg = base + CPG_RPCCKCR;
503 rpcd2->gate.bit_idx = 9;
504 rpcd2->gate.flags = CLK_GATE_SET_TO_DISABLE;
505 rpcd2->gate.lock = &cpg_lock;
506
507 clk = clk_register_composite(NULL, name, &parent_name, 1, NULL, NULL,
508 &rpcd2->fixed.hw, &clk_fixed_factor_ops,
509 &rpcd2->gate.hw, &clk_gate_ops,
510 CLK_SET_RATE_PARENT);
511 if (IS_ERR(clk))
512 kfree(rpcd2);
513
514 return clk;
515 }
516
517
518 static const struct rcar_gen3_cpg_pll_config *cpg_pll_config __initdata;
519 static unsigned int cpg_clk_extalr __initdata;
520 static u32 cpg_mode __initdata;
521
522 static const struct soc_device_attribute cpg_quirks_match[] __initconst = {
523 {
524 .soc_id = "r8a7795", .revision = "ES1.0",
525 .data = (void *)(PLL_ERRATA | RCKCR_CKSEL | SD_SKIP_FIRST),
526 },
527 {
528 .soc_id = "r8a7795", .revision = "ES1.*",
529 .data = (void *)(RCKCR_CKSEL | SD_SKIP_FIRST),
530 },
531 {
532 .soc_id = "r8a7795", .revision = "ES2.0",
533 .data = (void *)SD_SKIP_FIRST,
534 },
535 {
536 .soc_id = "r8a7796", .revision = "ES1.0",
537 .data = (void *)(RCKCR_CKSEL | SD_SKIP_FIRST),
538 },
539 {
540 .soc_id = "r8a7796", .revision = "ES1.1",
541 .data = (void *)SD_SKIP_FIRST,
542 },
543 { /* sentinel */ }
544 };
545
546 struct clk * __init rcar_gen3_cpg_clk_register(struct device *dev,
547 const struct cpg_core_clk *core, const struct cpg_mssr_info *info,
548 struct clk **clks, void __iomem *base,
549 struct raw_notifier_head *notifiers)
550 {
551 const struct clk *parent;
552 unsigned int mult = 1;
553 unsigned int div = 1;
554 u32 value;
555
556 parent = clks[core->parent & 0xffff]; /* some types use high bits */
557 if (IS_ERR(parent))
558 return ERR_CAST(parent);
559
560 switch (core->type) {
561 case CLK_TYPE_GEN3_MAIN:
562 div = cpg_pll_config->extal_div;
563 break;
564
565 case CLK_TYPE_GEN3_PLL0:
566 /*
567 * PLL0 is a configurable multiplier clock. Register it as a
568 * fixed factor clock for now as there's no generic multiplier
569 * clock implementation and we currently have no need to change
570 * the multiplier value.
571 */
572 value = readl(base + CPG_PLL0CR);
573 mult = (((value >> 24) & 0x7f) + 1) * 2;
574 if (cpg_quirks & PLL_ERRATA)
575 mult *= 2;
576 break;
577
578 case CLK_TYPE_GEN3_PLL1:
579 mult = cpg_pll_config->pll1_mult;
580 div = cpg_pll_config->pll1_div;
581 break;
582
583 case CLK_TYPE_GEN3_PLL2:
584 /*
585 * PLL2 is a configurable multiplier clock. Register it as a
586 * fixed factor clock for now as there's no generic multiplier
587 * clock implementation and we currently have no need to change
588 * the multiplier value.
589 */
590 value = readl(base + CPG_PLL2CR);
591 mult = (((value >> 24) & 0x7f) + 1) * 2;
592 if (cpg_quirks & PLL_ERRATA)
593 mult *= 2;
594 break;
595
596 case CLK_TYPE_GEN3_PLL3:
597 mult = cpg_pll_config->pll3_mult;
598 div = cpg_pll_config->pll3_div;
599 break;
600
601 case CLK_TYPE_GEN3_PLL4:
602 /*
603 * PLL4 is a configurable multiplier clock. Register it as a
604 * fixed factor clock for now as there's no generic multiplier
605 * clock implementation and we currently have no need to change
606 * the multiplier value.
607 */
608 value = readl(base + CPG_PLL4CR);
609 mult = (((value >> 24) & 0x7f) + 1) * 2;
610 if (cpg_quirks & PLL_ERRATA)
611 mult *= 2;
612 break;
613
614 case CLK_TYPE_GEN3_SD:
615 return cpg_sd_clk_register(core->name, base, core->offset,
616 __clk_get_name(parent), notifiers);
617
618 case CLK_TYPE_GEN3_R:
619 if (cpg_quirks & RCKCR_CKSEL) {
620 struct cpg_simple_notifier *csn;
621
622 csn = kzalloc(sizeof(*csn), GFP_KERNEL);
623 if (!csn)
624 return ERR_PTR(-ENOMEM);
625
626 csn->reg = base + CPG_RCKCR;
627
628 /*
629 * RINT is default.
630 * Only if EXTALR is populated, we switch to it.
631 */
632 value = readl(csn->reg) & 0x3f;
633
634 if (clk_get_rate(clks[cpg_clk_extalr])) {
635 parent = clks[cpg_clk_extalr];
636 value |= CPG_RCKCR_CKSEL;
637 }
638
639 writel(value, csn->reg);
640 cpg_simple_notifier_register(notifiers, csn);
641 break;
642 }
643
644 /* Select parent clock of RCLK by MD28 */
645 if (cpg_mode & BIT(28))
646 parent = clks[cpg_clk_extalr];
647 break;
648
649 case CLK_TYPE_GEN3_MDSEL:
650 /*
651 * Clock selectable between two parents and two fixed dividers
652 * using a mode pin
653 */
654 if (cpg_mode & BIT(core->offset)) {
655 div = core->div & 0xffff;
656 } else {
657 parent = clks[core->parent >> 16];
658 if (IS_ERR(parent))
659 return ERR_CAST(parent);
660 div = core->div >> 16;
661 }
662 mult = 1;
663 break;
664
665 case CLK_TYPE_GEN3_Z:
666 return cpg_z_clk_register(core->name, __clk_get_name(parent),
667 base, core->div, core->offset);
668
669 case CLK_TYPE_GEN3_OSC:
670 /*
671 * Clock combining OSC EXTAL predivider and a fixed divider
672 */
673 div = cpg_pll_config->osc_prediv * core->div;
674 break;
675
676 case CLK_TYPE_GEN3_RCKSEL:
677 /*
678 * Clock selectable between two parents and two fixed dividers
679 * using RCKCR.CKSEL
680 */
681 if (readl(base + CPG_RCKCR) & CPG_RCKCR_CKSEL) {
682 div = core->div & 0xffff;
683 } else {
684 parent = clks[core->parent >> 16];
685 if (IS_ERR(parent))
686 return ERR_CAST(parent);
687 div = core->div >> 16;
688 }
689 break;
690
691 case CLK_TYPE_GEN3_RPCSRC:
692 return clk_register_divider_table(NULL, core->name,
693 __clk_get_name(parent), 0,
694 base + CPG_RPCCKCR, 3, 2, 0,
695 cpg_rpcsrc_div_table,
696 &cpg_lock);
697
698 case CLK_TYPE_GEN3_E3_RPCSRC:
699 /*
700 * Register RPCSRC as fixed factor clock based on the
701 * MD[4:1] pins and CPG_RPCCKCR[4:3] register value for
702 * which has been set prior to booting the kernel.
703 */
704 value = (readl(base + CPG_RPCCKCR) & GENMASK(4, 3)) >> 3;
705
706 switch (value) {
707 case 0:
708 div = 5;
709 break;
710 case 1:
711 div = 3;
712 break;
713 case 2:
714 parent = clks[core->parent >> 16];
715 if (IS_ERR(parent))
716 return ERR_CAST(parent);
717 div = core->div;
718 break;
719 case 3:
720 default:
721 div = 2;
722 break;
723 }
724 break;
725
726 case CLK_TYPE_GEN3_RPC:
727 return cpg_rpc_clk_register(core->name, base,
728 __clk_get_name(parent), notifiers);
729
730 case CLK_TYPE_GEN3_RPCD2:
731 return cpg_rpcd2_clk_register(core->name, base,
732 __clk_get_name(parent));
733
734 default:
735 return ERR_PTR(-EINVAL);
736 }
737
738 return clk_register_fixed_factor(NULL, core->name,
739 __clk_get_name(parent), 0, mult, div);
740 }
741
742 int __init rcar_gen3_cpg_init(const struct rcar_gen3_cpg_pll_config *config,
743 unsigned int clk_extalr, u32 mode)
744 {
745 const struct soc_device_attribute *attr;
746
747 cpg_pll_config = config;
748 cpg_clk_extalr = clk_extalr;
749 cpg_mode = mode;
750 attr = soc_device_match(cpg_quirks_match);
751 if (attr)
752 cpg_quirks = (uintptr_t)attr->data;
753 pr_debug("%s: mode = 0x%x quirks = 0x%x\n", __func__, mode, cpg_quirks);
754
755 spin_lock_init(&cpg_lock);
756
757 return 0;
758 }
Linux with added FPC-III support