Merge tag 'for-linus-5.3' of git://github.com/cminyard/linux-ipmi
[platform/kernel/linux-rpi.git] / drivers / clk / clk-vt8500.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Clock implementation for VIA/Wondermedia SoC's
4  * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
5  */
6
7 #include <linux/io.h>
8 #include <linux/of.h>
9 #include <linux/of_address.h>
10 #include <linux/slab.h>
11 #include <linux/bitops.h>
12 #include <linux/clkdev.h>
13 #include <linux/clk-provider.h>
14
15 #define LEGACY_PMC_BASE         0xD8130000
16
17 /* All clocks share the same lock as none can be changed concurrently */
18 static DEFINE_SPINLOCK(_lock);
19
20 struct clk_device {
21         struct clk_hw   hw;
22         void __iomem    *div_reg;
23         unsigned int    div_mask;
24         void __iomem    *en_reg;
25         int             en_bit;
26         spinlock_t      *lock;
27 };
28
29 /*
30  * Add new PLL_TYPE_x definitions here as required. Use the first known model
31  * to support the new type as the name.
32  * Add case statements to vtwm_pll_recalc_rate(), vtwm_pll_round_round() and
33  * vtwm_pll_set_rate() to handle the new PLL_TYPE_x
34  */
35
36 #define PLL_TYPE_VT8500         0
37 #define PLL_TYPE_WM8650         1
38 #define PLL_TYPE_WM8750         2
39 #define PLL_TYPE_WM8850         3
40
41 struct clk_pll {
42         struct clk_hw   hw;
43         void __iomem    *reg;
44         spinlock_t      *lock;
45         int             type;
46 };
47
48 static void __iomem *pmc_base;
49
50 static __init void vtwm_set_pmc_base(void)
51 {
52         struct device_node *np =
53                 of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
54
55         if (np)
56                 pmc_base = of_iomap(np, 0);
57         else
58                 pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
59         of_node_put(np);
60
61         if (!pmc_base)
62                 pr_err("%s:of_iomap(pmc) failed\n", __func__);
63 }
64
65 #define to_clk_device(_hw) container_of(_hw, struct clk_device, hw)
66
67 #define VT8500_PMC_BUSY_MASK            0x18
68
69 static void vt8500_pmc_wait_busy(void)
70 {
71         while (readl(pmc_base) & VT8500_PMC_BUSY_MASK)
72                 cpu_relax();
73 }
74
75 static int vt8500_dclk_enable(struct clk_hw *hw)
76 {
77         struct clk_device *cdev = to_clk_device(hw);
78         u32 en_val;
79         unsigned long flags = 0;
80
81         spin_lock_irqsave(cdev->lock, flags);
82
83         en_val = readl(cdev->en_reg);
84         en_val |= BIT(cdev->en_bit);
85         writel(en_val, cdev->en_reg);
86
87         spin_unlock_irqrestore(cdev->lock, flags);
88         return 0;
89 }
90
91 static void vt8500_dclk_disable(struct clk_hw *hw)
92 {
93         struct clk_device *cdev = to_clk_device(hw);
94         u32 en_val;
95         unsigned long flags = 0;
96
97         spin_lock_irqsave(cdev->lock, flags);
98
99         en_val = readl(cdev->en_reg);
100         en_val &= ~BIT(cdev->en_bit);
101         writel(en_val, cdev->en_reg);
102
103         spin_unlock_irqrestore(cdev->lock, flags);
104 }
105
106 static int vt8500_dclk_is_enabled(struct clk_hw *hw)
107 {
108         struct clk_device *cdev = to_clk_device(hw);
109         u32 en_val = (readl(cdev->en_reg) & BIT(cdev->en_bit));
110
111         return en_val ? 1 : 0;
112 }
113
114 static unsigned long vt8500_dclk_recalc_rate(struct clk_hw *hw,
115                                 unsigned long parent_rate)
116 {
117         struct clk_device *cdev = to_clk_device(hw);
118         u32 div = readl(cdev->div_reg) & cdev->div_mask;
119
120         /* Special case for SDMMC devices */
121         if ((cdev->div_mask == 0x3F) && (div & BIT(5)))
122                 div = 64 * (div & 0x1f);
123
124         /* div == 0 is actually the highest divisor */
125         if (div == 0)
126                 div = (cdev->div_mask + 1);
127
128         return parent_rate / div;
129 }
130
131 static long vt8500_dclk_round_rate(struct clk_hw *hw, unsigned long rate,
132                                 unsigned long *prate)
133 {
134         struct clk_device *cdev = to_clk_device(hw);
135         u32 divisor;
136
137         if (rate == 0)
138                 return 0;
139
140         divisor = *prate / rate;
141
142         /* If prate / rate would be decimal, incr the divisor */
143         if (rate * divisor < *prate)
144                 divisor++;
145
146         /*
147          * If this is a request for SDMMC we have to adjust the divisor
148          * when >31 to use the fixed predivisor
149          */
150         if ((cdev->div_mask == 0x3F) && (divisor > 31)) {
151                 divisor = 64 * ((divisor / 64) + 1);
152         }
153
154         return *prate / divisor;
155 }
156
157 static int vt8500_dclk_set_rate(struct clk_hw *hw, unsigned long rate,
158                                 unsigned long parent_rate)
159 {
160         struct clk_device *cdev = to_clk_device(hw);
161         u32 divisor;
162         unsigned long flags = 0;
163
164         if (rate == 0)
165                 return 0;
166
167         divisor =  parent_rate / rate;
168
169         if (divisor == cdev->div_mask + 1)
170                 divisor = 0;
171
172         /* SDMMC mask may need to be corrected before testing if its valid */
173         if ((cdev->div_mask == 0x3F) && (divisor > 31)) {
174                 /*
175                  * Bit 5 is a fixed /64 predivisor. If the requested divisor
176                  * is >31 then correct for the fixed divisor being required.
177                  */
178                 divisor = 0x20 + (divisor / 64);
179         }
180
181         if (divisor > cdev->div_mask) {
182                 pr_err("%s: invalid divisor for clock\n", __func__);
183                 return -EINVAL;
184         }
185
186         spin_lock_irqsave(cdev->lock, flags);
187
188         vt8500_pmc_wait_busy();
189         writel(divisor, cdev->div_reg);
190         vt8500_pmc_wait_busy();
191
192         spin_unlock_irqrestore(cdev->lock, flags);
193
194         return 0;
195 }
196
197
198 static const struct clk_ops vt8500_gated_clk_ops = {
199         .enable = vt8500_dclk_enable,
200         .disable = vt8500_dclk_disable,
201         .is_enabled = vt8500_dclk_is_enabled,
202 };
203
204 static const struct clk_ops vt8500_divisor_clk_ops = {
205         .round_rate = vt8500_dclk_round_rate,
206         .set_rate = vt8500_dclk_set_rate,
207         .recalc_rate = vt8500_dclk_recalc_rate,
208 };
209
210 static const struct clk_ops vt8500_gated_divisor_clk_ops = {
211         .enable = vt8500_dclk_enable,
212         .disable = vt8500_dclk_disable,
213         .is_enabled = vt8500_dclk_is_enabled,
214         .round_rate = vt8500_dclk_round_rate,
215         .set_rate = vt8500_dclk_set_rate,
216         .recalc_rate = vt8500_dclk_recalc_rate,
217 };
218
219 #define CLK_INIT_GATED                  BIT(0)
220 #define CLK_INIT_DIVISOR                BIT(1)
221 #define CLK_INIT_GATED_DIVISOR          (CLK_INIT_DIVISOR | CLK_INIT_GATED)
222
223 static __init void vtwm_device_clk_init(struct device_node *node)
224 {
225         u32 en_reg, div_reg;
226         struct clk_hw *hw;
227         struct clk_device *dev_clk;
228         const char *clk_name = node->name;
229         const char *parent_name;
230         struct clk_init_data init;
231         int rc;
232         int clk_init_flags = 0;
233
234         if (!pmc_base)
235                 vtwm_set_pmc_base();
236
237         dev_clk = kzalloc(sizeof(*dev_clk), GFP_KERNEL);
238         if (WARN_ON(!dev_clk))
239                 return;
240
241         dev_clk->lock = &_lock;
242
243         rc = of_property_read_u32(node, "enable-reg", &en_reg);
244         if (!rc) {
245                 dev_clk->en_reg = pmc_base + en_reg;
246                 rc = of_property_read_u32(node, "enable-bit", &dev_clk->en_bit);
247                 if (rc) {
248                         pr_err("%s: enable-bit property required for gated clock\n",
249                                                                 __func__);
250                         return;
251                 }
252                 clk_init_flags |= CLK_INIT_GATED;
253         }
254
255         rc = of_property_read_u32(node, "divisor-reg", &div_reg);
256         if (!rc) {
257                 dev_clk->div_reg = pmc_base + div_reg;
258                 /*
259                  * use 0x1f as the default mask since it covers
260                  * almost all the clocks and reduces dts properties
261                  */
262                 dev_clk->div_mask = 0x1f;
263
264                 of_property_read_u32(node, "divisor-mask", &dev_clk->div_mask);
265                 clk_init_flags |= CLK_INIT_DIVISOR;
266         }
267
268         of_property_read_string(node, "clock-output-names", &clk_name);
269
270         switch (clk_init_flags) {
271         case CLK_INIT_GATED:
272                 init.ops = &vt8500_gated_clk_ops;
273                 break;
274         case CLK_INIT_DIVISOR:
275                 init.ops = &vt8500_divisor_clk_ops;
276                 break;
277         case CLK_INIT_GATED_DIVISOR:
278                 init.ops = &vt8500_gated_divisor_clk_ops;
279                 break;
280         default:
281                 pr_err("%s: Invalid clock description in device tree\n",
282                                                                 __func__);
283                 kfree(dev_clk);
284                 return;
285         }
286
287         init.name = clk_name;
288         init.flags = 0;
289         parent_name = of_clk_get_parent_name(node, 0);
290         init.parent_names = &parent_name;
291         init.num_parents = 1;
292
293         dev_clk->hw.init = &init;
294
295         hw = &dev_clk->hw;
296         rc = clk_hw_register(NULL, hw);
297         if (WARN_ON(rc)) {
298                 kfree(dev_clk);
299                 return;
300         }
301         rc = of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw);
302         clk_hw_register_clkdev(hw, clk_name, NULL);
303 }
304 CLK_OF_DECLARE(vt8500_device, "via,vt8500-device-clock", vtwm_device_clk_init);
305
306 /* PLL clock related functions */
307
308 #define to_clk_pll(_hw) container_of(_hw, struct clk_pll, hw)
309
310 /* Helper macros for PLL_VT8500 */
311 #define VT8500_PLL_MUL(x)       ((x & 0x1F) << 1)
312 #define VT8500_PLL_DIV(x)       ((x & 0x100) ? 1 : 2)
313
314 #define VT8500_BITS_TO_FREQ(r, m, d)                                    \
315                                 ((r / d) * m)
316
317 #define VT8500_BITS_TO_VAL(m, d)                                        \
318                                 ((d == 2 ? 0 : 0x100) | ((m >> 1) & 0x1F))
319
320 /* Helper macros for PLL_WM8650 */
321 #define WM8650_PLL_MUL(x)       (x & 0x3FF)
322 #define WM8650_PLL_DIV(x)       (((x >> 10) & 7) * (1 << ((x >> 13) & 3)))
323
324 #define WM8650_BITS_TO_FREQ(r, m, d1, d2)                               \
325                                 (r * m / (d1 * (1 << d2)))
326
327 #define WM8650_BITS_TO_VAL(m, d1, d2)                                   \
328                                 ((d2 << 13) | (d1 << 10) | (m & 0x3FF))
329
330 /* Helper macros for PLL_WM8750 */
331 #define WM8750_PLL_MUL(x)       (((x >> 16) & 0xFF) + 1)
332 #define WM8750_PLL_DIV(x)       ((((x >> 8) & 1) + 1) * (1 << (x & 7)))
333
334 #define WM8750_BITS_TO_FREQ(r, m, d1, d2)                               \
335                                 (r * (m+1) / ((d1+1) * (1 << d2)))
336
337 #define WM8750_BITS_TO_VAL(f, m, d1, d2)                                \
338                 ((f << 24) | ((m - 1) << 16) | ((d1 - 1) << 8) | d2)
339
340 /* Helper macros for PLL_WM8850 */
341 #define WM8850_PLL_MUL(x)       ((((x >> 16) & 0x7F) + 1) * 2)
342 #define WM8850_PLL_DIV(x)       ((((x >> 8) & 1) + 1) * (1 << (x & 3)))
343
344 #define WM8850_BITS_TO_FREQ(r, m, d1, d2)                               \
345                                 (r * ((m + 1) * 2) / ((d1+1) * (1 << d2)))
346
347 #define WM8850_BITS_TO_VAL(m, d1, d2)                                   \
348                 ((((m / 2) - 1) << 16) | ((d1 - 1) << 8) | d2)
349
350 static int vt8500_find_pll_bits(unsigned long rate, unsigned long parent_rate,
351                                 u32 *multiplier, u32 *prediv)
352 {
353         unsigned long tclk;
354
355         /* sanity check */
356         if ((rate < parent_rate * 4) || (rate > parent_rate * 62)) {
357                 pr_err("%s: requested rate out of range\n", __func__);
358                 *multiplier = 0;
359                 *prediv = 1;
360                 return -EINVAL;
361         }
362         if (rate <= parent_rate * 31)
363                 /* use the prediv to double the resolution */
364                 *prediv = 2;
365         else
366                 *prediv = 1;
367
368         *multiplier = rate / (parent_rate / *prediv);
369         tclk = (parent_rate / *prediv) * *multiplier;
370
371         if (tclk != rate)
372                 pr_warn("%s: requested rate %lu, found rate %lu\n", __func__,
373                                                                 rate, tclk);
374
375         return 0;
376 }
377
378 /*
379  * M * parent [O1] => / P [O2] => / D [O3]
380  * Where O1 is 900MHz...3GHz;
381  * O2 is 600MHz >= (M * parent) / P >= 300MHz;
382  * M is 36...120 [25MHz parent]; D is 1 or 2 or 4 or 8.
383  * Possible ranges (O3):
384  * D = 8: 37,5MHz...75MHz
385  * D = 4: 75MHz...150MHz
386  * D = 2: 150MHz...300MHz
387  * D = 1: 300MHz...600MHz
388  */
389 static int wm8650_find_pll_bits(unsigned long rate,
390         unsigned long parent_rate, u32 *multiplier, u32 *divisor1,
391         u32 *divisor2)
392 {
393         unsigned long O1, min_err, rate_err;
394
395         if (!parent_rate || (rate < 37500000) || (rate > 600000000))
396                 return -EINVAL;
397
398         *divisor2 = rate <= 75000000 ? 3 : rate <= 150000000 ? 2 :
399                                            rate <= 300000000 ? 1 : 0;
400         /*
401          * Divisor P cannot be calculated. Test all divisors and find where M
402          * will be as close as possible to the requested rate.
403          */
404         min_err = ULONG_MAX;
405         for (*divisor1 = 5; *divisor1 >= 3; (*divisor1)--) {
406                 O1 = rate * *divisor1 * (1 << (*divisor2));
407                 rate_err = O1 % parent_rate;
408                 if (rate_err < min_err) {
409                         *multiplier = O1 / parent_rate;
410                         if (rate_err == 0)
411                                 return 0;
412
413                         min_err = rate_err;
414                 }
415         }
416
417         if ((*multiplier < 3) || (*multiplier > 1023))
418                 return -EINVAL;
419
420         pr_warn("%s: rate error is %lu\n", __func__, min_err);
421
422         return 0;
423 }
424
425 static u32 wm8750_get_filter(u32 parent_rate, u32 divisor1)
426 {
427         /* calculate frequency (MHz) after pre-divisor */
428         u32 freq = (parent_rate / 1000000) / (divisor1 + 1);
429
430         if ((freq < 10) || (freq > 200))
431                 pr_warn("%s: PLL recommended input frequency 10..200Mhz (requested %d Mhz)\n",
432                                 __func__, freq);
433
434         if (freq >= 166)
435                 return 7;
436         else if (freq >= 104)
437                 return 6;
438         else if (freq >= 65)
439                 return 5;
440         else if (freq >= 42)
441                 return 4;
442         else if (freq >= 26)
443                 return 3;
444         else if (freq >= 16)
445                 return 2;
446         else if (freq >= 10)
447                 return 1;
448
449         return 0;
450 }
451
452 static int wm8750_find_pll_bits(unsigned long rate, unsigned long parent_rate,
453                                 u32 *filter, u32 *multiplier, u32 *divisor1, u32 *divisor2)
454 {
455         u32 mul;
456         int div1, div2;
457         unsigned long tclk, rate_err, best_err;
458
459         best_err = (unsigned long)-1;
460
461         /* Find the closest match (lower or equal to requested) */
462         for (div1 = 1; div1 >= 0; div1--)
463                 for (div2 = 7; div2 >= 0; div2--)
464                         for (mul = 0; mul <= 255; mul++) {
465                                 tclk = parent_rate * (mul + 1) / ((div1 + 1) * (1 << div2));
466                                 if (tclk > rate)
467                                         continue;
468                                 /* error will always be +ve */
469                                 rate_err = rate - tclk;
470                                 if (rate_err == 0) {
471                                         *filter = wm8750_get_filter(parent_rate, div1);
472                                         *multiplier = mul;
473                                         *divisor1 = div1;
474                                         *divisor2 = div2;
475                                         return 0;
476                                 }
477
478                                 if (rate_err < best_err) {
479                                         best_err = rate_err;
480                                         *multiplier = mul;
481                                         *divisor1 = div1;
482                                         *divisor2 = div2;
483                                 }
484                         }
485
486         if (best_err == (unsigned long)-1) {
487                 pr_warn("%s: impossible rate %lu\n", __func__, rate);
488                 return -EINVAL;
489         }
490
491         /* if we got here, it wasn't an exact match */
492         pr_warn("%s: requested rate %lu, found rate %lu\n", __func__, rate,
493                                                         rate - best_err);
494
495         *filter = wm8750_get_filter(parent_rate, *divisor1);
496
497         return 0;
498 }
499
500 static int wm8850_find_pll_bits(unsigned long rate, unsigned long parent_rate,
501                                 u32 *multiplier, u32 *divisor1, u32 *divisor2)
502 {
503         u32 mul;
504         int div1, div2;
505         unsigned long tclk, rate_err, best_err;
506
507         best_err = (unsigned long)-1;
508
509         /* Find the closest match (lower or equal to requested) */
510         for (div1 = 1; div1 >= 0; div1--)
511                 for (div2 = 3; div2 >= 0; div2--)
512                         for (mul = 0; mul <= 127; mul++) {
513                                 tclk = parent_rate * ((mul + 1) * 2) /
514                                                 ((div1 + 1) * (1 << div2));
515                                 if (tclk > rate)
516                                         continue;
517                                 /* error will always be +ve */
518                                 rate_err = rate - tclk;
519                                 if (rate_err == 0) {
520                                         *multiplier = mul;
521                                         *divisor1 = div1;
522                                         *divisor2 = div2;
523                                         return 0;
524                                 }
525
526                                 if (rate_err < best_err) {
527                                         best_err = rate_err;
528                                         *multiplier = mul;
529                                         *divisor1 = div1;
530                                         *divisor2 = div2;
531                                 }
532                         }
533
534         if (best_err == (unsigned long)-1) {
535                 pr_warn("%s: impossible rate %lu\n", __func__, rate);
536                 return -EINVAL;
537         }
538
539         /* if we got here, it wasn't an exact match */
540         pr_warn("%s: requested rate %lu, found rate %lu\n", __func__, rate,
541                                                         rate - best_err);
542
543         return 0;
544 }
545
546 static int vtwm_pll_set_rate(struct clk_hw *hw, unsigned long rate,
547                                 unsigned long parent_rate)
548 {
549         struct clk_pll *pll = to_clk_pll(hw);
550         u32 filter, mul, div1, div2;
551         u32 pll_val;
552         unsigned long flags = 0;
553         int ret;
554
555         /* sanity check */
556
557         switch (pll->type) {
558         case PLL_TYPE_VT8500:
559                 ret = vt8500_find_pll_bits(rate, parent_rate, &mul, &div1);
560                 if (!ret)
561                         pll_val = VT8500_BITS_TO_VAL(mul, div1);
562                 break;
563         case PLL_TYPE_WM8650:
564                 ret = wm8650_find_pll_bits(rate, parent_rate, &mul, &div1, &div2);
565                 if (!ret)
566                         pll_val = WM8650_BITS_TO_VAL(mul, div1, div2);
567                 break;
568         case PLL_TYPE_WM8750:
569                 ret = wm8750_find_pll_bits(rate, parent_rate, &filter, &mul, &div1, &div2);
570                 if (!ret)
571                         pll_val = WM8750_BITS_TO_VAL(filter, mul, div1, div2);
572                 break;
573         case PLL_TYPE_WM8850:
574                 ret = wm8850_find_pll_bits(rate, parent_rate, &mul, &div1, &div2);
575                 if (!ret)
576                         pll_val = WM8850_BITS_TO_VAL(mul, div1, div2);
577                 break;
578         default:
579                 pr_err("%s: invalid pll type\n", __func__);
580                 ret = -EINVAL;
581         }
582
583         if (ret)
584                 return ret;
585
586         spin_lock_irqsave(pll->lock, flags);
587
588         vt8500_pmc_wait_busy();
589         writel(pll_val, pll->reg);
590         vt8500_pmc_wait_busy();
591
592         spin_unlock_irqrestore(pll->lock, flags);
593
594         return 0;
595 }
596
597 static long vtwm_pll_round_rate(struct clk_hw *hw, unsigned long rate,
598                                 unsigned long *prate)
599 {
600         struct clk_pll *pll = to_clk_pll(hw);
601         u32 filter, mul, div1, div2;
602         long round_rate;
603         int ret;
604
605         switch (pll->type) {
606         case PLL_TYPE_VT8500:
607                 ret = vt8500_find_pll_bits(rate, *prate, &mul, &div1);
608                 if (!ret)
609                         round_rate = VT8500_BITS_TO_FREQ(*prate, mul, div1);
610                 break;
611         case PLL_TYPE_WM8650:
612                 ret = wm8650_find_pll_bits(rate, *prate, &mul, &div1, &div2);
613                 if (!ret)
614                         round_rate = WM8650_BITS_TO_FREQ(*prate, mul, div1, div2);
615                 break;
616         case PLL_TYPE_WM8750:
617                 ret = wm8750_find_pll_bits(rate, *prate, &filter, &mul, &div1, &div2);
618                 if (!ret)
619                         round_rate = WM8750_BITS_TO_FREQ(*prate, mul, div1, div2);
620                 break;
621         case PLL_TYPE_WM8850:
622                 ret = wm8850_find_pll_bits(rate, *prate, &mul, &div1, &div2);
623                 if (!ret)
624                         round_rate = WM8850_BITS_TO_FREQ(*prate, mul, div1, div2);
625                 break;
626         default:
627                 ret = -EINVAL;
628         }
629
630         if (ret)
631                 return ret;
632
633         return round_rate;
634 }
635
636 static unsigned long vtwm_pll_recalc_rate(struct clk_hw *hw,
637                                 unsigned long parent_rate)
638 {
639         struct clk_pll *pll = to_clk_pll(hw);
640         u32 pll_val = readl(pll->reg);
641         unsigned long pll_freq;
642
643         switch (pll->type) {
644         case PLL_TYPE_VT8500:
645                 pll_freq = parent_rate * VT8500_PLL_MUL(pll_val);
646                 pll_freq /= VT8500_PLL_DIV(pll_val);
647                 break;
648         case PLL_TYPE_WM8650:
649                 pll_freq = parent_rate * WM8650_PLL_MUL(pll_val);
650                 pll_freq /= WM8650_PLL_DIV(pll_val);
651                 break;
652         case PLL_TYPE_WM8750:
653                 pll_freq = parent_rate * WM8750_PLL_MUL(pll_val);
654                 pll_freq /= WM8750_PLL_DIV(pll_val);
655                 break;
656         case PLL_TYPE_WM8850:
657                 pll_freq = parent_rate * WM8850_PLL_MUL(pll_val);
658                 pll_freq /= WM8850_PLL_DIV(pll_val);
659                 break;
660         default:
661                 pll_freq = 0;
662         }
663
664         return pll_freq;
665 }
666
667 static const struct clk_ops vtwm_pll_ops = {
668         .round_rate = vtwm_pll_round_rate,
669         .set_rate = vtwm_pll_set_rate,
670         .recalc_rate = vtwm_pll_recalc_rate,
671 };
672
673 static __init void vtwm_pll_clk_init(struct device_node *node, int pll_type)
674 {
675         u32 reg;
676         struct clk_hw *hw;
677         struct clk_pll *pll_clk;
678         const char *clk_name = node->name;
679         const char *parent_name;
680         struct clk_init_data init;
681         int rc;
682
683         if (!pmc_base)
684                 vtwm_set_pmc_base();
685
686         rc = of_property_read_u32(node, "reg", &reg);
687         if (WARN_ON(rc))
688                 return;
689
690         pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
691         if (WARN_ON(!pll_clk))
692                 return;
693
694         pll_clk->reg = pmc_base + reg;
695         pll_clk->lock = &_lock;
696         pll_clk->type = pll_type;
697
698         of_property_read_string(node, "clock-output-names", &clk_name);
699
700         init.name = clk_name;
701         init.ops = &vtwm_pll_ops;
702         init.flags = 0;
703         parent_name = of_clk_get_parent_name(node, 0);
704         init.parent_names = &parent_name;
705         init.num_parents = 1;
706
707         pll_clk->hw.init = &init;
708
709         hw = &pll_clk->hw;
710         rc = clk_hw_register(NULL, &pll_clk->hw);
711         if (WARN_ON(rc)) {
712                 kfree(pll_clk);
713                 return;
714         }
715         rc = of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw);
716         clk_hw_register_clkdev(hw, clk_name, NULL);
717 }
718
719
720 /* Wrappers for initialization functions */
721
722 static void __init vt8500_pll_init(struct device_node *node)
723 {
724         vtwm_pll_clk_init(node, PLL_TYPE_VT8500);
725 }
726 CLK_OF_DECLARE(vt8500_pll, "via,vt8500-pll-clock", vt8500_pll_init);
727
728 static void __init wm8650_pll_init(struct device_node *node)
729 {
730         vtwm_pll_clk_init(node, PLL_TYPE_WM8650);
731 }
732 CLK_OF_DECLARE(wm8650_pll, "wm,wm8650-pll-clock", wm8650_pll_init);
733
734 static void __init wm8750_pll_init(struct device_node *node)
735 {
736         vtwm_pll_clk_init(node, PLL_TYPE_WM8750);
737 }
738 CLK_OF_DECLARE(wm8750_pll, "wm,wm8750-pll-clock", wm8750_pll_init);
739
740 static void __init wm8850_pll_init(struct device_node *node)
741 {
742         vtwm_pll_clk_init(node, PLL_TYPE_WM8850);
743 }
744 CLK_OF_DECLARE(wm8850_pll, "wm,wm8850-pll-clock", wm8850_pll_init);