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Linux 4.19.133
[linux/fpc-iii.git] / drivers / clk / clk-vt8500.c
blob4161a6f257415fae0d80a29144bff9faf640fe29
1 /*
2 * Clock implementation for VIA/Wondermedia SoC's
3 * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16 #include <linux/io.h>
17 #include <linux/of.h>
18 #include <linux/of_address.h>
19 #include <linux/slab.h>
20 #include <linux/bitops.h>
21 #include <linux/clkdev.h>
22 #include <linux/clk-provider.h>
23
24 #define LEGACY_PMC_BASE 0xD8130000
25
26 /* All clocks share the same lock as none can be changed concurrently */
27 static DEFINE_SPINLOCK(_lock);
28
29 struct clk_device {
30 struct clk_hw hw;
31 void __iomem *div_reg;
32 unsigned int div_mask;
33 void __iomem *en_reg;
34 int en_bit;
35 spinlock_t *lock;
36 };
37
38 /*
39 * Add new PLL_TYPE_x definitions here as required. Use the first known model
40 * to support the new type as the name.
41 * Add case statements to vtwm_pll_recalc_rate(), vtwm_pll_round_round() and
42 * vtwm_pll_set_rate() to handle the new PLL_TYPE_x
43 */
44
45 #define PLL_TYPE_VT8500 0
46 #define PLL_TYPE_WM8650 1
47 #define PLL_TYPE_WM8750 2
48 #define PLL_TYPE_WM8850 3
49
50 struct clk_pll {
51 struct clk_hw hw;
52 void __iomem *reg;
53 spinlock_t *lock;
54 int type;
55 };
56
57 static void __iomem *pmc_base;
58
59 static __init void vtwm_set_pmc_base(void)
60 {
61 struct device_node *np =
62 of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
63
64 if (np)
65 pmc_base = of_iomap(np, 0);
66 else
67 pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
68 of_node_put(np);
69
70 if (!pmc_base)
71 pr_err("%s:of_iomap(pmc) failed\n", __func__);
72 }
73
74 #define to_clk_device(_hw) container_of(_hw, struct clk_device, hw)
75
76 #define VT8500_PMC_BUSY_MASK 0x18
77
78 static void vt8500_pmc_wait_busy(void)
79 {
80 while (readl(pmc_base) & VT8500_PMC_BUSY_MASK)
81 cpu_relax();
82 }
83
84 static int vt8500_dclk_enable(struct clk_hw *hw)
85 {
86 struct clk_device *cdev = to_clk_device(hw);
87 u32 en_val;
88 unsigned long flags = 0;
89
90 spin_lock_irqsave(cdev->lock, flags);
91
92 en_val = readl(cdev->en_reg);
93 en_val |= BIT(cdev->en_bit);
94 writel(en_val, cdev->en_reg);
95
96 spin_unlock_irqrestore(cdev->lock, flags);
97 return 0;
98 }
99
100 static void vt8500_dclk_disable(struct clk_hw *hw)
101 {
102 struct clk_device *cdev = to_clk_device(hw);
103 u32 en_val;
104 unsigned long flags = 0;
105
106 spin_lock_irqsave(cdev->lock, flags);
107
108 en_val = readl(cdev->en_reg);
109 en_val &= ~BIT(cdev->en_bit);
110 writel(en_val, cdev->en_reg);
111
112 spin_unlock_irqrestore(cdev->lock, flags);
113 }
114
115 static int vt8500_dclk_is_enabled(struct clk_hw *hw)
116 {
117 struct clk_device *cdev = to_clk_device(hw);
118 u32 en_val = (readl(cdev->en_reg) & BIT(cdev->en_bit));
119
120 return en_val ? 1 : 0;
121 }
122
123 static unsigned long vt8500_dclk_recalc_rate(struct clk_hw *hw,
124 unsigned long parent_rate)
125 {
126 struct clk_device *cdev = to_clk_device(hw);
127 u32 div = readl(cdev->div_reg) & cdev->div_mask;
128
129 /* Special case for SDMMC devices */
130 if ((cdev->div_mask == 0x3F) && (div & BIT(5)))
131 div = 64 * (div & 0x1f);
132
133 /* div == 0 is actually the highest divisor */
134 if (div == 0)
135 div = (cdev->div_mask + 1);
136
137 return parent_rate / div;
138 }
139
140 static long vt8500_dclk_round_rate(struct clk_hw *hw, unsigned long rate,
141 unsigned long *prate)
142 {
143 struct clk_device *cdev = to_clk_device(hw);
144 u32 divisor;
145
146 if (rate == 0)
147 return 0;
148
149 divisor = *prate / rate;
150
151 /* If prate / rate would be decimal, incr the divisor */
152 if (rate * divisor < *prate)
153 divisor++;
154
155 /*
156 * If this is a request for SDMMC we have to adjust the divisor
157 * when >31 to use the fixed predivisor
158 */
159 if ((cdev->div_mask == 0x3F) && (divisor > 31)) {
160 divisor = 64 * ((divisor / 64) + 1);
161 }
162
163 return *prate / divisor;
164 }
165
166 static int vt8500_dclk_set_rate(struct clk_hw *hw, unsigned long rate,
167 unsigned long parent_rate)
168 {
169 struct clk_device *cdev = to_clk_device(hw);
170 u32 divisor;
171 unsigned long flags = 0;
172
173 if (rate == 0)
174 return 0;
175
176 divisor = parent_rate / rate;
177
178 if (divisor == cdev->div_mask + 1)
179 divisor = 0;
180
181 /* SDMMC mask may need to be corrected before testing if its valid */
182 if ((cdev->div_mask == 0x3F) && (divisor > 31)) {
183 /*
184 * Bit 5 is a fixed /64 predivisor. If the requested divisor
185 * is >31 then correct for the fixed divisor being required.
186 */
187 divisor = 0x20 + (divisor / 64);
188 }
189
190 if (divisor > cdev->div_mask) {
191 pr_err("%s: invalid divisor for clock\n", __func__);
192 return -EINVAL;
193 }
194
195 spin_lock_irqsave(cdev->lock, flags);
196
197 vt8500_pmc_wait_busy();
198 writel(divisor, cdev->div_reg);
199 vt8500_pmc_wait_busy();
200
201 spin_unlock_irqrestore(cdev->lock, flags);
202
203 return 0;
204 }
205
206
207 static const struct clk_ops vt8500_gated_clk_ops = {
208 .enable = vt8500_dclk_enable,
209 .disable = vt8500_dclk_disable,
210 .is_enabled = vt8500_dclk_is_enabled,
211 };
212
213 static const struct clk_ops vt8500_divisor_clk_ops = {
214 .round_rate = vt8500_dclk_round_rate,
215 .set_rate = vt8500_dclk_set_rate,
216 .recalc_rate = vt8500_dclk_recalc_rate,
217 };
218
219 static const struct clk_ops vt8500_gated_divisor_clk_ops = {
220 .enable = vt8500_dclk_enable,
221 .disable = vt8500_dclk_disable,
222 .is_enabled = vt8500_dclk_is_enabled,
223 .round_rate = vt8500_dclk_round_rate,
224 .set_rate = vt8500_dclk_set_rate,
225 .recalc_rate = vt8500_dclk_recalc_rate,
226 };
227
228 #define CLK_INIT_GATED BIT(0)
229 #define CLK_INIT_DIVISOR BIT(1)
230 #define CLK_INIT_GATED_DIVISOR (CLK_INIT_DIVISOR | CLK_INIT_GATED)
231
232 static __init void vtwm_device_clk_init(struct device_node *node)
233 {
234 u32 en_reg, div_reg;
235 struct clk_hw *hw;
236 struct clk_device *dev_clk;
237 const char *clk_name = node->name;
238 const char *parent_name;
239 struct clk_init_data init;
240 int rc;
241 int clk_init_flags = 0;
242
243 if (!pmc_base)
244 vtwm_set_pmc_base();
245
246 dev_clk = kzalloc(sizeof(*dev_clk), GFP_KERNEL);
247 if (WARN_ON(!dev_clk))
248 return;
249
250 dev_clk->lock = &_lock;
251
252 rc = of_property_read_u32(node, "enable-reg", &en_reg);
253 if (!rc) {
254 dev_clk->en_reg = pmc_base + en_reg;
255 rc = of_property_read_u32(node, "enable-bit", &dev_clk->en_bit);
256 if (rc) {
257 pr_err("%s: enable-bit property required for gated clock\n",
258 __func__);
259 return;
260 }
261 clk_init_flags |= CLK_INIT_GATED;
262 }
263
264 rc = of_property_read_u32(node, "divisor-reg", &div_reg);
265 if (!rc) {
266 dev_clk->div_reg = pmc_base + div_reg;
267 /*
268 * use 0x1f as the default mask since it covers
269 * almost all the clocks and reduces dts properties
270 */
271 dev_clk->div_mask = 0x1f;
272
273 of_property_read_u32(node, "divisor-mask", &dev_clk->div_mask);
274 clk_init_flags |= CLK_INIT_DIVISOR;
275 }
276
277 of_property_read_string(node, "clock-output-names", &clk_name);
278
279 switch (clk_init_flags) {
280 case CLK_INIT_GATED:
281 init.ops = &vt8500_gated_clk_ops;
282 break;
283 case CLK_INIT_DIVISOR:
284 init.ops = &vt8500_divisor_clk_ops;
285 break;
286 case CLK_INIT_GATED_DIVISOR:
287 init.ops = &vt8500_gated_divisor_clk_ops;
288 break;
289 default:
290 pr_err("%s: Invalid clock description in device tree\n",
291 __func__);
292 kfree(dev_clk);
293 return;
294 }
295
296 init.name = clk_name;
297 init.flags = 0;
298 parent_name = of_clk_get_parent_name(node, 0);
299 init.parent_names = &parent_name;
300 init.num_parents = 1;
301
302 dev_clk->hw.init = &init;
303
304 hw = &dev_clk->hw;
305 rc = clk_hw_register(NULL, hw);
306 if (WARN_ON(rc)) {
307 kfree(dev_clk);
308 return;
309 }
310 rc = of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw);
311 clk_hw_register_clkdev(hw, clk_name, NULL);
312 }
313 CLK_OF_DECLARE(vt8500_device, "via,vt8500-device-clock", vtwm_device_clk_init);
314
315 /* PLL clock related functions */
316
317 #define to_clk_pll(_hw) container_of(_hw, struct clk_pll, hw)
318
319 /* Helper macros for PLL_VT8500 */
320 #define VT8500_PLL_MUL(x) ((x & 0x1F) << 1)
321 #define VT8500_PLL_DIV(x) ((x & 0x100) ? 1 : 2)
322
323 #define VT8500_BITS_TO_FREQ(r, m, d) \
324 ((r / d) * m)
325
326 #define VT8500_BITS_TO_VAL(m, d) \
327 ((d == 2 ? 0 : 0x100) | ((m >> 1) & 0x1F))
328
329 /* Helper macros for PLL_WM8650 */
330 #define WM8650_PLL_MUL(x) (x & 0x3FF)
331 #define WM8650_PLL_DIV(x) (((x >> 10) & 7) * (1 << ((x >> 13) & 3)))
332
333 #define WM8650_BITS_TO_FREQ(r, m, d1, d2) \
334 (r * m / (d1 * (1 << d2)))
335
336 #define WM8650_BITS_TO_VAL(m, d1, d2) \
337 ((d2 << 13) | (d1 << 10) | (m & 0x3FF))
338
339 /* Helper macros for PLL_WM8750 */
340 #define WM8750_PLL_MUL(x) (((x >> 16) & 0xFF) + 1)
341 #define WM8750_PLL_DIV(x) ((((x >> 8) & 1) + 1) * (1 << (x & 7)))
342
343 #define WM8750_BITS_TO_FREQ(r, m, d1, d2) \
344 (r * (m+1) / ((d1+1) * (1 << d2)))
345
346 #define WM8750_BITS_TO_VAL(f, m, d1, d2) \
347 ((f << 24) | ((m - 1) << 16) | ((d1 - 1) << 8) | d2)
348
349 /* Helper macros for PLL_WM8850 */
350 #define WM8850_PLL_MUL(x) ((((x >> 16) & 0x7F) + 1) * 2)
351 #define WM8850_PLL_DIV(x) ((((x >> 8) & 1) + 1) * (1 << (x & 3)))
352
353 #define WM8850_BITS_TO_FREQ(r, m, d1, d2) \
354 (r * ((m + 1) * 2) / ((d1+1) * (1 << d2)))
355
356 #define WM8850_BITS_TO_VAL(m, d1, d2) \
357 ((((m / 2) - 1) << 16) | ((d1 - 1) << 8) | d2)
358
359 static int vt8500_find_pll_bits(unsigned long rate, unsigned long parent_rate,
360 u32 *multiplier, u32 *prediv)
361 {
362 unsigned long tclk;
363
364 /* sanity check */
365 if ((rate < parent_rate * 4) || (rate > parent_rate * 62)) {
366 pr_err("%s: requested rate out of range\n", __func__);
367 *multiplier = 0;
368 *prediv = 1;
369 return -EINVAL;
370 }
371 if (rate <= parent_rate * 31)
372 /* use the prediv to double the resolution */
373 *prediv = 2;
374 else
375 *prediv = 1;
376
377 *multiplier = rate / (parent_rate / *prediv);
378 tclk = (parent_rate / *prediv) * *multiplier;
379
380 if (tclk != rate)
381 pr_warn("%s: requested rate %lu, found rate %lu\n", __func__,
382 rate, tclk);
383
384 return 0;
385 }
386
387 /*
388 * M * parent [O1] => / P [O2] => / D [O3]
389 * Where O1 is 900MHz...3GHz;
390 * O2 is 600MHz >= (M * parent) / P >= 300MHz;
391 * M is 36...120 [25MHz parent]; D is 1 or 2 or 4 or 8.
392 * Possible ranges (O3):
393 * D = 8: 37,5MHz...75MHz
394 * D = 4: 75MHz...150MHz
395 * D = 2: 150MHz...300MHz
396 * D = 1: 300MHz...600MHz
397 */
398 static int wm8650_find_pll_bits(unsigned long rate,
399 unsigned long parent_rate, u32 *multiplier, u32 *divisor1,
400 u32 *divisor2)
401 {
402 unsigned long O1, min_err, rate_err;
403
404 if (!parent_rate || (rate < 37500000) || (rate > 600000000))
405 return -EINVAL;
406
407 *divisor2 = rate <= 75000000 ? 3 : rate <= 150000000 ? 2 :
408 rate <= 300000000 ? 1 : 0;
409 /*
410 * Divisor P cannot be calculated. Test all divisors and find where M
411 * will be as close as possible to the requested rate.
412 */
413 min_err = ULONG_MAX;
414 for (*divisor1 = 5; *divisor1 >= 3; (*divisor1)--) {
415 O1 = rate * *divisor1 * (1 << (*divisor2));
416 rate_err = O1 % parent_rate;
417 if (rate_err < min_err) {
418 *multiplier = O1 / parent_rate;
419 if (rate_err == 0)
420 return 0;
421
422 min_err = rate_err;
423 }
424 }
425
426 if ((*multiplier < 3) || (*multiplier > 1023))
427 return -EINVAL;
428
429 pr_warn("%s: rate error is %lu\n", __func__, min_err);
430
431 return 0;
432 }
433
434 static u32 wm8750_get_filter(u32 parent_rate, u32 divisor1)
435 {
436 /* calculate frequency (MHz) after pre-divisor */
437 u32 freq = (parent_rate / 1000000) / (divisor1 + 1);
438
439 if ((freq < 10) || (freq > 200))
440 pr_warn("%s: PLL recommended input frequency 10..200Mhz (requested %d Mhz)\n",
441 __func__, freq);
442
443 if (freq >= 166)
444 return 7;
445 else if (freq >= 104)
446 return 6;
447 else if (freq >= 65)
448 return 5;
449 else if (freq >= 42)
450 return 4;
451 else if (freq >= 26)
452 return 3;
453 else if (freq >= 16)
454 return 2;
455 else if (freq >= 10)
456 return 1;
457
458 return 0;
459 }
460
461 static int wm8750_find_pll_bits(unsigned long rate, unsigned long parent_rate,
462 u32 *filter, u32 *multiplier, u32 *divisor1, u32 *divisor2)
463 {
464 u32 mul;
465 int div1, div2;
466 unsigned long tclk, rate_err, best_err;
467
468 best_err = (unsigned long)-1;
469
470 /* Find the closest match (lower or equal to requested) */
471 for (div1 = 1; div1 >= 0; div1--)
472 for (div2 = 7; div2 >= 0; div2--)
473 for (mul = 0; mul <= 255; mul++) {
474 tclk = parent_rate * (mul + 1) / ((div1 + 1) * (1 << div2));
475 if (tclk > rate)
476 continue;
477 /* error will always be +ve */
478 rate_err = rate - tclk;
479 if (rate_err == 0) {
480 *filter = wm8750_get_filter(parent_rate, div1);
481 *multiplier = mul;
482 *divisor1 = div1;
483 *divisor2 = div2;
484 return 0;
485 }
486
487 if (rate_err < best_err) {
488 best_err = rate_err;
489 *multiplier = mul;
490 *divisor1 = div1;
491 *divisor2 = div2;
492 }
493 }
494
495 if (best_err == (unsigned long)-1) {
496 pr_warn("%s: impossible rate %lu\n", __func__, rate);
497 return -EINVAL;
498 }
499
500 /* if we got here, it wasn't an exact match */
501 pr_warn("%s: requested rate %lu, found rate %lu\n", __func__, rate,
502 rate - best_err);
503
504 *filter = wm8750_get_filter(parent_rate, *divisor1);
505
506 return 0;
507 }
508
509 static int wm8850_find_pll_bits(unsigned long rate, unsigned long parent_rate,
510 u32 *multiplier, u32 *divisor1, u32 *divisor2)
511 {
512 u32 mul;
513 int div1, div2;
514 unsigned long tclk, rate_err, best_err;
515
516 best_err = (unsigned long)-1;
517
518 /* Find the closest match (lower or equal to requested) */
519 for (div1 = 1; div1 >= 0; div1--)
520 for (div2 = 3; div2 >= 0; div2--)
521 for (mul = 0; mul <= 127; mul++) {
522 tclk = parent_rate * ((mul + 1) * 2) /
523 ((div1 + 1) * (1 << div2));
524 if (tclk > rate)
525 continue;
526 /* error will always be +ve */
527 rate_err = rate - tclk;
528 if (rate_err == 0) {
529 *multiplier = mul;
530 *divisor1 = div1;
531 *divisor2 = div2;
532 return 0;
533 }
534
535 if (rate_err < best_err) {
536 best_err = rate_err;
537 *multiplier = mul;
538 *divisor1 = div1;
539 *divisor2 = div2;
540 }
541 }
542
543 if (best_err == (unsigned long)-1) {
544 pr_warn("%s: impossible rate %lu\n", __func__, rate);
545 return -EINVAL;
546 }
547
548 /* if we got here, it wasn't an exact match */
549 pr_warn("%s: requested rate %lu, found rate %lu\n", __func__, rate,
550 rate - best_err);
551
552 return 0;
553 }
554
555 static int vtwm_pll_set_rate(struct clk_hw *hw, unsigned long rate,
556 unsigned long parent_rate)
557 {
558 struct clk_pll *pll = to_clk_pll(hw);
559 u32 filter, mul, div1, div2;
560 u32 pll_val;
561 unsigned long flags = 0;
562 int ret;
563
564 /* sanity check */
565
566 switch (pll->type) {
567 case PLL_TYPE_VT8500:
568 ret = vt8500_find_pll_bits(rate, parent_rate, &mul, &div1);
569 if (!ret)
570 pll_val = VT8500_BITS_TO_VAL(mul, div1);
571 break;
572 case PLL_TYPE_WM8650:
573 ret = wm8650_find_pll_bits(rate, parent_rate, &mul, &div1, &div2);
574 if (!ret)
575 pll_val = WM8650_BITS_TO_VAL(mul, div1, div2);
576 break;
577 case PLL_TYPE_WM8750:
578 ret = wm8750_find_pll_bits(rate, parent_rate, &filter, &mul, &div1, &div2);
579 if (!ret)
580 pll_val = WM8750_BITS_TO_VAL(filter, mul, div1, div2);
581 break;
582 case PLL_TYPE_WM8850:
583 ret = wm8850_find_pll_bits(rate, parent_rate, &mul, &div1, &div2);
584 if (!ret)
585 pll_val = WM8850_BITS_TO_VAL(mul, div1, div2);
586 break;
587 default:
588 pr_err("%s: invalid pll type\n", __func__);
589 ret = -EINVAL;
590 }
591
592 if (ret)
593 return ret;
594
595 spin_lock_irqsave(pll->lock, flags);
596
597 vt8500_pmc_wait_busy();
598 writel(pll_val, pll->reg);
599 vt8500_pmc_wait_busy();
600
601 spin_unlock_irqrestore(pll->lock, flags);
602
603 return 0;
604 }
605
606 static long vtwm_pll_round_rate(struct clk_hw *hw, unsigned long rate,
607 unsigned long *prate)
608 {
609 struct clk_pll *pll = to_clk_pll(hw);
610 u32 filter, mul, div1, div2;
611 long round_rate;
612 int ret;
613
614 switch (pll->type) {
615 case PLL_TYPE_VT8500:
616 ret = vt8500_find_pll_bits(rate, *prate, &mul, &div1);
617 if (!ret)
618 round_rate = VT8500_BITS_TO_FREQ(*prate, mul, div1);
619 break;
620 case PLL_TYPE_WM8650:
621 ret = wm8650_find_pll_bits(rate, *prate, &mul, &div1, &div2);
622 if (!ret)
623 round_rate = WM8650_BITS_TO_FREQ(*prate, mul, div1, div2);
624 break;
625 case PLL_TYPE_WM8750:
626 ret = wm8750_find_pll_bits(rate, *prate, &filter, &mul, &div1, &div2);
627 if (!ret)
628 round_rate = WM8750_BITS_TO_FREQ(*prate, mul, div1, div2);
629 break;
630 case PLL_TYPE_WM8850:
631 ret = wm8850_find_pll_bits(rate, *prate, &mul, &div1, &div2);
632 if (!ret)
633 round_rate = WM8850_BITS_TO_FREQ(*prate, mul, div1, div2);
634 break;
635 default:
636 ret = -EINVAL;
637 }
638
639 if (ret)
640 return ret;
641
642 return round_rate;
643 }
644
645 static unsigned long vtwm_pll_recalc_rate(struct clk_hw *hw,
646 unsigned long parent_rate)
647 {
648 struct clk_pll *pll = to_clk_pll(hw);
649 u32 pll_val = readl(pll->reg);
650 unsigned long pll_freq;
651
652 switch (pll->type) {
653 case PLL_TYPE_VT8500:
654 pll_freq = parent_rate * VT8500_PLL_MUL(pll_val);
655 pll_freq /= VT8500_PLL_DIV(pll_val);
656 break;
657 case PLL_TYPE_WM8650:
658 pll_freq = parent_rate * WM8650_PLL_MUL(pll_val);
659 pll_freq /= WM8650_PLL_DIV(pll_val);
660 break;
661 case PLL_TYPE_WM8750:
662 pll_freq = parent_rate * WM8750_PLL_MUL(pll_val);
663 pll_freq /= WM8750_PLL_DIV(pll_val);
664 break;
665 case PLL_TYPE_WM8850:
666 pll_freq = parent_rate * WM8850_PLL_MUL(pll_val);
667 pll_freq /= WM8850_PLL_DIV(pll_val);
668 break;
669 default:
670 pll_freq = 0;
671 }
672
673 return pll_freq;
674 }
675
676 static const struct clk_ops vtwm_pll_ops = {
677 .round_rate = vtwm_pll_round_rate,
678 .set_rate = vtwm_pll_set_rate,
679 .recalc_rate = vtwm_pll_recalc_rate,
680 };
681
682 static __init void vtwm_pll_clk_init(struct device_node *node, int pll_type)
683 {
684 u32 reg;
685 struct clk_hw *hw;
686 struct clk_pll *pll_clk;
687 const char *clk_name = node->name;
688 const char *parent_name;
689 struct clk_init_data init;
690 int rc;
691
692 if (!pmc_base)
693 vtwm_set_pmc_base();
694
695 rc = of_property_read_u32(node, "reg", &reg);
696 if (WARN_ON(rc))
697 return;
698
699 pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
700 if (WARN_ON(!pll_clk))
701 return;
702
703 pll_clk->reg = pmc_base + reg;
704 pll_clk->lock = &_lock;
705 pll_clk->type = pll_type;
706
707 of_property_read_string(node, "clock-output-names", &clk_name);
708
709 init.name = clk_name;
710 init.ops = &vtwm_pll_ops;
711 init.flags = 0;
712 parent_name = of_clk_get_parent_name(node, 0);
713 init.parent_names = &parent_name;
714 init.num_parents = 1;
715
716 pll_clk->hw.init = &init;
717
718 hw = &pll_clk->hw;
719 rc = clk_hw_register(NULL, &pll_clk->hw);
720 if (WARN_ON(rc)) {
721 kfree(pll_clk);
722 return;
723 }
724 rc = of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw);
725 clk_hw_register_clkdev(hw, clk_name, NULL);
726 }
727
728
729 /* Wrappers for initialization functions */
730
731 static void __init vt8500_pll_init(struct device_node *node)
732 {
733 vtwm_pll_clk_init(node, PLL_TYPE_VT8500);
734 }
735 CLK_OF_DECLARE(vt8500_pll, "via,vt8500-pll-clock", vt8500_pll_init);
736
737 static void __init wm8650_pll_init(struct device_node *node)
738 {
739 vtwm_pll_clk_init(node, PLL_TYPE_WM8650);
740 }
741 CLK_OF_DECLARE(wm8650_pll, "wm,wm8650-pll-clock", wm8650_pll_init);
742
743 static void __init wm8750_pll_init(struct device_node *node)
744 {
745 vtwm_pll_clk_init(node, PLL_TYPE_WM8750);
746 }
747 CLK_OF_DECLARE(wm8750_pll, "wm,wm8750-pll-clock", wm8750_pll_init);
748
749 static void __init wm8850_pll_init(struct device_node *node)
750 {
751 vtwm_pll_clk_init(node, PLL_TYPE_WM8850);
752 }
753 CLK_OF_DECLARE(wm8850_pll, "wm,wm8850-pll-clock", wm8850_pll_init);
Linux with added FPC-III support