1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Xilinx 'Clocking Wizard' driver
4  *
5  *  Copyright (C) 2013 - 2021 Xilinx
6  *
7  *  Sören Brinkmann <soren.brinkmann@xilinx.com>
8  *
9  */
10 
11 #include <linux/bitfield.h>
12 #include <linux/platform_device.h>
13 #include <linux/clk.h>
14 #include <linux/clk-provider.h>
15 #include <linux/slab.h>
16 #include <linux/io.h>
17 #include <linux/of.h>
18 #include <linux/math64.h>
19 #include <linux/module.h>
20 #include <linux/err.h>
21 #include <linux/iopoll.h>
22 
23 #define WZRD_NUM_OUTPUTS	7
24 #define WZRD_ACLK_MAX_FREQ	250000000UL
25 
26 #define WZRD_CLK_CFG_REG(n)	(0x200 + 4 * (n))
27 
28 #define WZRD_CLKOUT0_FRAC_EN	BIT(18)
29 #define WZRD_CLKFBOUT_FRAC_EN	BIT(26)
30 
31 #define WZRD_CLKFBOUT_MULT_SHIFT	8
32 #define WZRD_CLKFBOUT_MULT_MASK		(0xff << WZRD_CLKFBOUT_MULT_SHIFT)
33 #define WZRD_CLKFBOUT_FRAC_SHIFT	16
34 #define WZRD_CLKFBOUT_FRAC_MASK		(0x3ff << WZRD_CLKFBOUT_FRAC_SHIFT)
35 #define WZRD_DIVCLK_DIVIDE_SHIFT	0
36 #define WZRD_DIVCLK_DIVIDE_MASK		(0xff << WZRD_DIVCLK_DIVIDE_SHIFT)
37 #define WZRD_CLKOUT_DIVIDE_SHIFT	0
38 #define WZRD_CLKOUT_DIVIDE_WIDTH	8
39 #define WZRD_CLKOUT_DIVIDE_MASK		(0xff << WZRD_DIVCLK_DIVIDE_SHIFT)
40 #define WZRD_CLKOUT_FRAC_SHIFT		8
41 #define WZRD_CLKOUT_FRAC_MASK		0x3ff
42 #define WZRD_CLKOUT0_FRAC_MASK		GENMASK(17, 8)
43 
44 #define WZRD_DR_MAX_INT_DIV_VALUE	255
45 #define WZRD_DR_STATUS_REG_OFFSET	0x04
46 #define WZRD_DR_LOCK_BIT_MASK		0x00000001
47 #define WZRD_DR_INIT_REG_OFFSET		0x25C
48 #define WZRD_DR_DIV_TO_PHASE_OFFSET	4
49 #define WZRD_DR_BEGIN_DYNA_RECONF	0x03
50 #define WZRD_DR_BEGIN_DYNA_RECONF_5_2	0x07
51 #define WZRD_DR_BEGIN_DYNA_RECONF1_5_2	0x02
52 
53 #define WZRD_USEC_POLL		10
54 #define WZRD_TIMEOUT_POLL		1000
55 
56 /* Divider limits, from UG572 Table 3-4 for Ultrascale+ */
57 #define DIV_O				0x01
58 #define DIV_ALL				0x03
59 
60 #define WZRD_M_MIN			2
61 #define WZRD_M_MAX			128
62 #define WZRD_D_MIN			1
63 #define WZRD_D_MAX			106
64 #define WZRD_VCO_MIN			800000000
65 #define WZRD_VCO_MAX			1600000000
66 #define WZRD_O_MIN			1
67 #define WZRD_O_MAX			128
68 #define WZRD_MIN_ERR			20000
69 #define WZRD_FRAC_POINTS		1000
70 
71 /* Get the mask from width */
72 #define div_mask(width)			((1 << (width)) - 1)
73 
74 /* Extract divider instance from clock hardware instance */
75 #define to_clk_wzrd_divider(_hw) container_of(_hw, struct clk_wzrd_divider, hw)
76 
77 enum clk_wzrd_int_clks {
78 	wzrd_clk_mul,
79 	wzrd_clk_mul_div,
80 	wzrd_clk_mul_frac,
81 	wzrd_clk_int_max
82 };
83 
84 /**
85  * struct clk_wzrd - Clock wizard private data structure
86  *
87  * @clk_data:		Clock data
88  * @nb:			Notifier block
89  * @base:		Memory base
90  * @clk_in1:		Handle to input clock 'clk_in1'
91  * @axi_clk:		Handle to input clock 's_axi_aclk'
92  * @clks_internal:	Internal clocks
93  * @clkout:		Output clocks
94  * @speed_grade:	Speed grade of the device
95  * @suspended:		Flag indicating power state of the device
96  */
97 struct clk_wzrd {
98 	struct clk_onecell_data clk_data;
99 	struct notifier_block nb;
100 	void __iomem *base;
101 	struct clk *clk_in1;
102 	struct clk *axi_clk;
103 	struct clk *clks_internal[wzrd_clk_int_max];
104 	struct clk *clkout[WZRD_NUM_OUTPUTS];
105 	unsigned int speed_grade;
106 	bool suspended;
107 };
108 
109 /**
110  * struct clk_wzrd_divider - clock divider specific to clk_wzrd
111  *
112  * @hw:		handle between common and hardware-specific interfaces
113  * @base:	base address of register containing the divider
114  * @offset:	offset address of register containing the divider
115  * @shift:	shift to the divider bit field
116  * @width:	width of the divider bit field
117  * @flags:	clk_wzrd divider flags
118  * @table:	array of value/divider pairs, last entry should have div = 0
119  * @m:	value of the multiplier
120  * @d:	value of the common divider
121  * @o:	value of the leaf divider
122  * @lock:	register lock
123  */
124 struct clk_wzrd_divider {
125 	struct clk_hw hw;
126 	void __iomem *base;
127 	u16 offset;
128 	u8 shift;
129 	u8 width;
130 	u8 flags;
131 	const struct clk_div_table *table;
132 	u32 m;
133 	u32 d;
134 	u32 o;
135 	spinlock_t *lock;  /* divider lock */
136 };
137 
138 #define to_clk_wzrd(_nb) container_of(_nb, struct clk_wzrd, nb)
139 
140 /* maximum frequencies for input/output clocks per speed grade */
141 static const unsigned long clk_wzrd_max_freq[] = {
142 	800000000UL,
143 	933000000UL,
144 	1066000000UL
145 };
146 
147 /* spin lock variable for clk_wzrd */
148 static DEFINE_SPINLOCK(clkwzrd_lock);
149 
clk_wzrd_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)150 static unsigned long clk_wzrd_recalc_rate(struct clk_hw *hw,
151 					  unsigned long parent_rate)
152 {
153 	struct clk_wzrd_divider *divider = to_clk_wzrd_divider(hw);
154 	void __iomem *div_addr = divider->base + divider->offset;
155 	unsigned int val;
156 
157 	val = readl(div_addr) >> divider->shift;
158 	val &= div_mask(divider->width);
159 
160 	return divider_recalc_rate(hw, parent_rate, val, divider->table,
161 			divider->flags, divider->width);
162 }
163 
clk_wzrd_dynamic_reconfig(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)164 static int clk_wzrd_dynamic_reconfig(struct clk_hw *hw, unsigned long rate,
165 				     unsigned long parent_rate)
166 {
167 	int err;
168 	u32 value;
169 	unsigned long flags = 0;
170 	struct clk_wzrd_divider *divider = to_clk_wzrd_divider(hw);
171 	void __iomem *div_addr = divider->base + divider->offset;
172 
173 	if (divider->lock)
174 		spin_lock_irqsave(divider->lock, flags);
175 	else
176 		__acquire(divider->lock);
177 
178 	value = DIV_ROUND_CLOSEST(parent_rate, rate);
179 
180 	/* Cap the value to max */
181 	min_t(u32, value, WZRD_DR_MAX_INT_DIV_VALUE);
182 
183 	/* Set divisor and clear phase offset */
184 	writel(value, div_addr);
185 	writel(0x00, div_addr + WZRD_DR_DIV_TO_PHASE_OFFSET);
186 
187 	/* Check status register */
188 	err = readl_poll_timeout(divider->base + WZRD_DR_STATUS_REG_OFFSET,
189 				 value, value & WZRD_DR_LOCK_BIT_MASK,
190 				 WZRD_USEC_POLL, WZRD_TIMEOUT_POLL);
191 	if (err)
192 		goto err_reconfig;
193 
194 	/* Initiate reconfiguration */
195 	writel(WZRD_DR_BEGIN_DYNA_RECONF_5_2,
196 	       divider->base + WZRD_DR_INIT_REG_OFFSET);
197 	writel(WZRD_DR_BEGIN_DYNA_RECONF1_5_2,
198 	       divider->base + WZRD_DR_INIT_REG_OFFSET);
199 
200 	/* Check status register */
201 	err = readl_poll_timeout(divider->base + WZRD_DR_STATUS_REG_OFFSET,
202 				 value, value & WZRD_DR_LOCK_BIT_MASK,
203 				 WZRD_USEC_POLL, WZRD_TIMEOUT_POLL);
204 err_reconfig:
205 	if (divider->lock)
206 		spin_unlock_irqrestore(divider->lock, flags);
207 	else
208 		__release(divider->lock);
209 	return err;
210 }
211 
clk_wzrd_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * prate)212 static long clk_wzrd_round_rate(struct clk_hw *hw, unsigned long rate,
213 				unsigned long *prate)
214 {
215 	u8 div;
216 
217 	/*
218 	 * since we don't change parent rate we just round rate to closest
219 	 * achievable
220 	 */
221 	div = DIV_ROUND_CLOSEST(*prate, rate);
222 
223 	return *prate / div;
224 }
225 
clk_wzrd_get_divisors(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)226 static int clk_wzrd_get_divisors(struct clk_hw *hw, unsigned long rate,
227 				 unsigned long parent_rate)
228 {
229 	struct clk_wzrd_divider *divider = to_clk_wzrd_divider(hw);
230 	unsigned long vco_freq, freq, diff;
231 	u32 m, d, o;
232 
233 	for (m = WZRD_M_MIN; m <= WZRD_M_MAX; m++) {
234 		for (d = WZRD_D_MIN; d <= WZRD_D_MAX; d++) {
235 			vco_freq = DIV_ROUND_CLOSEST((parent_rate * m), d);
236 			if (vco_freq >= WZRD_VCO_MIN && vco_freq <= WZRD_VCO_MAX) {
237 				for (o = WZRD_O_MIN; o <= WZRD_O_MAX; o++) {
238 					freq = DIV_ROUND_CLOSEST_ULL(vco_freq, o);
239 					diff = abs(freq - rate);
240 
241 					if (diff < WZRD_MIN_ERR) {
242 						divider->m = m;
243 						divider->d = d;
244 						divider->o = o;
245 						return 0;
246 					}
247 				}
248 			}
249 		}
250 	}
251 	return -EBUSY;
252 }
253 
clk_wzrd_dynamic_all_nolock(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)254 static int clk_wzrd_dynamic_all_nolock(struct clk_hw *hw, unsigned long rate,
255 				       unsigned long parent_rate)
256 {
257 	struct clk_wzrd_divider *divider = to_clk_wzrd_divider(hw);
258 	unsigned long vco_freq, rate_div, clockout0_div;
259 	u32 reg, pre, value, f;
260 	int err;
261 
262 	err = clk_wzrd_get_divisors(hw, rate, parent_rate);
263 	if (err)
264 		return err;
265 
266 	vco_freq = DIV_ROUND_CLOSEST(parent_rate * divider->m, divider->d);
267 	rate_div = DIV_ROUND_CLOSEST_ULL((vco_freq * WZRD_FRAC_POINTS), rate);
268 
269 	clockout0_div = div_u64(rate_div,  WZRD_FRAC_POINTS);
270 
271 	pre = DIV_ROUND_CLOSEST_ULL(vco_freq * WZRD_FRAC_POINTS, rate);
272 	f = (pre - (clockout0_div * WZRD_FRAC_POINTS));
273 	f &= WZRD_CLKOUT_FRAC_MASK;
274 
275 	reg = FIELD_PREP(WZRD_CLKOUT_DIVIDE_MASK, clockout0_div) |
276 	      FIELD_PREP(WZRD_CLKOUT0_FRAC_MASK, f);
277 
278 	writel(reg, divider->base + WZRD_CLK_CFG_REG(2));
279 	/* Set divisor and clear phase offset */
280 	reg = FIELD_PREP(WZRD_CLKFBOUT_MULT_MASK, divider->m) |
281 	      FIELD_PREP(WZRD_DIVCLK_DIVIDE_MASK, divider->d);
282 	writel(reg, divider->base + WZRD_CLK_CFG_REG(0));
283 	writel(divider->o, divider->base + WZRD_CLK_CFG_REG(2));
284 	writel(0, divider->base + WZRD_CLK_CFG_REG(3));
285 	/* Check status register */
286 	err = readl_poll_timeout(divider->base + WZRD_DR_STATUS_REG_OFFSET, value,
287 				 value & WZRD_DR_LOCK_BIT_MASK,
288 				 WZRD_USEC_POLL, WZRD_TIMEOUT_POLL);
289 	if (err)
290 		return -ETIMEDOUT;
291 
292 	/* Initiate reconfiguration */
293 	writel(WZRD_DR_BEGIN_DYNA_RECONF,
294 	       divider->base + WZRD_DR_INIT_REG_OFFSET);
295 
296 	/* Check status register */
297 	return readl_poll_timeout(divider->base + WZRD_DR_STATUS_REG_OFFSET, value,
298 				 value & WZRD_DR_LOCK_BIT_MASK,
299 				 WZRD_USEC_POLL, WZRD_TIMEOUT_POLL);
300 }
301 
clk_wzrd_dynamic_all(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)302 static int clk_wzrd_dynamic_all(struct clk_hw *hw, unsigned long rate,
303 				unsigned long parent_rate)
304 {
305 	struct clk_wzrd_divider *divider = to_clk_wzrd_divider(hw);
306 	unsigned long flags = 0;
307 	int ret;
308 
309 	spin_lock_irqsave(divider->lock, flags);
310 
311 	ret = clk_wzrd_dynamic_all_nolock(hw, rate, parent_rate);
312 
313 	spin_unlock_irqrestore(divider->lock, flags);
314 
315 	return ret;
316 }
317 
clk_wzrd_recalc_rate_all(struct clk_hw * hw,unsigned long parent_rate)318 static unsigned long clk_wzrd_recalc_rate_all(struct clk_hw *hw,
319 					      unsigned long parent_rate)
320 {
321 	struct clk_wzrd_divider *divider = to_clk_wzrd_divider(hw);
322 	u32 m, d, o, div, reg, f;
323 
324 	reg = readl(divider->base + WZRD_CLK_CFG_REG(0));
325 	d = FIELD_GET(WZRD_DIVCLK_DIVIDE_MASK, reg);
326 	m = FIELD_GET(WZRD_CLKFBOUT_MULT_MASK, reg);
327 	reg = readl(divider->base + WZRD_CLK_CFG_REG(2));
328 	o = FIELD_GET(WZRD_DIVCLK_DIVIDE_MASK, reg);
329 	f = FIELD_GET(WZRD_CLKOUT0_FRAC_MASK, reg);
330 
331 	div = DIV_ROUND_CLOSEST(d * (WZRD_FRAC_POINTS * o + f), WZRD_FRAC_POINTS);
332 	return divider_recalc_rate(hw, parent_rate * m, div, divider->table,
333 			divider->flags, divider->width);
334 }
335 
clk_wzrd_round_rate_all(struct clk_hw * hw,unsigned long rate,unsigned long * prate)336 static long clk_wzrd_round_rate_all(struct clk_hw *hw, unsigned long rate,
337 				    unsigned long *prate)
338 {
339 	struct clk_wzrd_divider *divider = to_clk_wzrd_divider(hw);
340 	unsigned long int_freq;
341 	u32 m, d, o, div, f;
342 	int err;
343 
344 	err = clk_wzrd_get_divisors(hw, rate, *prate);
345 	if (err)
346 		return err;
347 
348 	m = divider->m;
349 	d = divider->d;
350 	o = divider->o;
351 
352 	div = d * o;
353 	int_freq =  divider_recalc_rate(hw, *prate * m, div, divider->table,
354 					divider->flags, divider->width);
355 
356 	if (rate > int_freq) {
357 		f = DIV_ROUND_CLOSEST_ULL(rate * WZRD_FRAC_POINTS, int_freq);
358 		rate = DIV_ROUND_CLOSEST(int_freq * f, WZRD_FRAC_POINTS);
359 	}
360 	return rate;
361 }
362 
363 static const struct clk_ops clk_wzrd_clk_divider_ops = {
364 	.round_rate = clk_wzrd_round_rate,
365 	.set_rate = clk_wzrd_dynamic_reconfig,
366 	.recalc_rate = clk_wzrd_recalc_rate,
367 };
368 
369 static const struct clk_ops clk_wzrd_clk_div_all_ops = {
370 	.round_rate = clk_wzrd_round_rate_all,
371 	.set_rate = clk_wzrd_dynamic_all,
372 	.recalc_rate = clk_wzrd_recalc_rate_all,
373 };
374 
clk_wzrd_recalc_ratef(struct clk_hw * hw,unsigned long parent_rate)375 static unsigned long clk_wzrd_recalc_ratef(struct clk_hw *hw,
376 					   unsigned long parent_rate)
377 {
378 	unsigned int val;
379 	u32 div, frac;
380 	struct clk_wzrd_divider *divider = to_clk_wzrd_divider(hw);
381 	void __iomem *div_addr = divider->base + divider->offset;
382 
383 	val = readl(div_addr);
384 	div = val & div_mask(divider->width);
385 	frac = (val >> WZRD_CLKOUT_FRAC_SHIFT) & WZRD_CLKOUT_FRAC_MASK;
386 
387 	return mult_frac(parent_rate, 1000, (div * 1000) + frac);
388 }
389 
clk_wzrd_dynamic_reconfig_f(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)390 static int clk_wzrd_dynamic_reconfig_f(struct clk_hw *hw, unsigned long rate,
391 				       unsigned long parent_rate)
392 {
393 	int err;
394 	u32 value, pre;
395 	unsigned long rate_div, f, clockout0_div;
396 	struct clk_wzrd_divider *divider = to_clk_wzrd_divider(hw);
397 	void __iomem *div_addr = divider->base + divider->offset;
398 
399 	rate_div = DIV_ROUND_DOWN_ULL(parent_rate * 1000, rate);
400 	clockout0_div = rate_div / 1000;
401 
402 	pre = DIV_ROUND_CLOSEST((parent_rate * 1000), rate);
403 	f = (u32)(pre - (clockout0_div * 1000));
404 	f = f & WZRD_CLKOUT_FRAC_MASK;
405 	f = f << WZRD_CLKOUT_DIVIDE_WIDTH;
406 
407 	value = (f  | (clockout0_div & WZRD_CLKOUT_DIVIDE_MASK));
408 
409 	/* Set divisor and clear phase offset */
410 	writel(value, div_addr);
411 	writel(0x0, div_addr + WZRD_DR_DIV_TO_PHASE_OFFSET);
412 
413 	/* Check status register */
414 	err = readl_poll_timeout(divider->base + WZRD_DR_STATUS_REG_OFFSET, value,
415 				 value & WZRD_DR_LOCK_BIT_MASK,
416 				 WZRD_USEC_POLL, WZRD_TIMEOUT_POLL);
417 	if (err)
418 		return err;
419 
420 	/* Initiate reconfiguration */
421 	writel(WZRD_DR_BEGIN_DYNA_RECONF_5_2,
422 	       divider->base + WZRD_DR_INIT_REG_OFFSET);
423 	writel(WZRD_DR_BEGIN_DYNA_RECONF1_5_2,
424 	       divider->base + WZRD_DR_INIT_REG_OFFSET);
425 
426 	/* Check status register */
427 	return readl_poll_timeout(divider->base + WZRD_DR_STATUS_REG_OFFSET, value,
428 				value & WZRD_DR_LOCK_BIT_MASK,
429 				WZRD_USEC_POLL, WZRD_TIMEOUT_POLL);
430 }
431 
clk_wzrd_round_rate_f(struct clk_hw * hw,unsigned long rate,unsigned long * prate)432 static long clk_wzrd_round_rate_f(struct clk_hw *hw, unsigned long rate,
433 				  unsigned long *prate)
434 {
435 	return rate;
436 }
437 
438 static const struct clk_ops clk_wzrd_clk_divider_ops_f = {
439 	.round_rate = clk_wzrd_round_rate_f,
440 	.set_rate = clk_wzrd_dynamic_reconfig_f,
441 	.recalc_rate = clk_wzrd_recalc_ratef,
442 };
443 
clk_wzrd_register_divf(struct device * dev,const char * name,const char * parent_name,unsigned long flags,void __iomem * base,u16 offset,u8 shift,u8 width,u8 clk_divider_flags,u32 div_type,spinlock_t * lock)444 static struct clk *clk_wzrd_register_divf(struct device *dev,
445 					  const char *name,
446 					  const char *parent_name,
447 					  unsigned long flags,
448 					  void __iomem *base, u16 offset,
449 					  u8 shift, u8 width,
450 					  u8 clk_divider_flags,
451 					  u32 div_type,
452 					  spinlock_t *lock)
453 {
454 	struct clk_wzrd_divider *div;
455 	struct clk_hw *hw;
456 	struct clk_init_data init;
457 	int ret;
458 
459 	div = devm_kzalloc(dev, sizeof(*div), GFP_KERNEL);
460 	if (!div)
461 		return ERR_PTR(-ENOMEM);
462 
463 	init.name = name;
464 
465 	init.ops = &clk_wzrd_clk_divider_ops_f;
466 
467 	init.flags = flags;
468 	init.parent_names = &parent_name;
469 	init.num_parents = 1;
470 
471 	div->base = base;
472 	div->offset = offset;
473 	div->shift = shift;
474 	div->width = width;
475 	div->flags = clk_divider_flags;
476 	div->lock = lock;
477 	div->hw.init = &init;
478 
479 	hw = &div->hw;
480 	ret =  devm_clk_hw_register(dev, hw);
481 	if (ret)
482 		return ERR_PTR(ret);
483 
484 	return hw->clk;
485 }
486 
clk_wzrd_register_divider(struct device * dev,const char * name,const char * parent_name,unsigned long flags,void __iomem * base,u16 offset,u8 shift,u8 width,u8 clk_divider_flags,u32 div_type,spinlock_t * lock)487 static struct clk *clk_wzrd_register_divider(struct device *dev,
488 					     const char *name,
489 					     const char *parent_name,
490 					     unsigned long flags,
491 					     void __iomem *base, u16 offset,
492 					     u8 shift, u8 width,
493 					     u8 clk_divider_flags,
494 					     u32 div_type,
495 					     spinlock_t *lock)
496 {
497 	struct clk_wzrd_divider *div;
498 	struct clk_hw *hw;
499 	struct clk_init_data init;
500 	int ret;
501 
502 	div = devm_kzalloc(dev, sizeof(*div), GFP_KERNEL);
503 	if (!div)
504 		return ERR_PTR(-ENOMEM);
505 
506 	init.name = name;
507 	if (clk_divider_flags & CLK_DIVIDER_READ_ONLY)
508 		init.ops = &clk_divider_ro_ops;
509 	else if (div_type == DIV_O)
510 		init.ops = &clk_wzrd_clk_divider_ops;
511 	else
512 		init.ops = &clk_wzrd_clk_div_all_ops;
513 	init.flags = flags;
514 	init.parent_names =  &parent_name;
515 	init.num_parents =  1;
516 
517 	div->base = base;
518 	div->offset = offset;
519 	div->shift = shift;
520 	div->width = width;
521 	div->flags = clk_divider_flags;
522 	div->lock = lock;
523 	div->hw.init = &init;
524 
525 	hw = &div->hw;
526 	ret = devm_clk_hw_register(dev, hw);
527 	if (ret)
528 		return ERR_PTR(ret);
529 
530 	return hw->clk;
531 }
532 
clk_wzrd_clk_notifier(struct notifier_block * nb,unsigned long event,void * data)533 static int clk_wzrd_clk_notifier(struct notifier_block *nb, unsigned long event,
534 				 void *data)
535 {
536 	unsigned long max;
537 	struct clk_notifier_data *ndata = data;
538 	struct clk_wzrd *clk_wzrd = to_clk_wzrd(nb);
539 
540 	if (clk_wzrd->suspended)
541 		return NOTIFY_OK;
542 
543 	if (ndata->clk == clk_wzrd->clk_in1)
544 		max = clk_wzrd_max_freq[clk_wzrd->speed_grade - 1];
545 	else if (ndata->clk == clk_wzrd->axi_clk)
546 		max = WZRD_ACLK_MAX_FREQ;
547 	else
548 		return NOTIFY_DONE;	/* should never happen */
549 
550 	switch (event) {
551 	case PRE_RATE_CHANGE:
552 		if (ndata->new_rate > max)
553 			return NOTIFY_BAD;
554 		return NOTIFY_OK;
555 	case POST_RATE_CHANGE:
556 	case ABORT_RATE_CHANGE:
557 	default:
558 		return NOTIFY_DONE;
559 	}
560 }
561 
clk_wzrd_suspend(struct device * dev)562 static int __maybe_unused clk_wzrd_suspend(struct device *dev)
563 {
564 	struct clk_wzrd *clk_wzrd = dev_get_drvdata(dev);
565 
566 	clk_disable_unprepare(clk_wzrd->axi_clk);
567 	clk_wzrd->suspended = true;
568 
569 	return 0;
570 }
571 
clk_wzrd_resume(struct device * dev)572 static int __maybe_unused clk_wzrd_resume(struct device *dev)
573 {
574 	int ret;
575 	struct clk_wzrd *clk_wzrd = dev_get_drvdata(dev);
576 
577 	ret = clk_prepare_enable(clk_wzrd->axi_clk);
578 	if (ret) {
579 		dev_err(dev, "unable to enable s_axi_aclk\n");
580 		return ret;
581 	}
582 
583 	clk_wzrd->suspended = false;
584 
585 	return 0;
586 }
587 
588 static SIMPLE_DEV_PM_OPS(clk_wzrd_dev_pm_ops, clk_wzrd_suspend,
589 			 clk_wzrd_resume);
590 
clk_wzrd_probe(struct platform_device * pdev)591 static int clk_wzrd_probe(struct platform_device *pdev)
592 {
593 	int i, ret;
594 	u32 reg, reg_f, mult;
595 	unsigned long rate;
596 	const char *clk_name;
597 	void __iomem *ctrl_reg;
598 	struct clk_wzrd *clk_wzrd;
599 	const char *clkout_name;
600 	struct device_node *np = pdev->dev.of_node;
601 	int nr_outputs;
602 	unsigned long flags = 0;
603 
604 	clk_wzrd = devm_kzalloc(&pdev->dev, sizeof(*clk_wzrd), GFP_KERNEL);
605 	if (!clk_wzrd)
606 		return -ENOMEM;
607 	platform_set_drvdata(pdev, clk_wzrd);
608 
609 	clk_wzrd->base = devm_platform_ioremap_resource(pdev, 0);
610 	if (IS_ERR(clk_wzrd->base))
611 		return PTR_ERR(clk_wzrd->base);
612 
613 	ret = of_property_read_u32(np, "xlnx,speed-grade", &clk_wzrd->speed_grade);
614 	if (!ret) {
615 		if (clk_wzrd->speed_grade < 1 || clk_wzrd->speed_grade > 3) {
616 			dev_warn(&pdev->dev, "invalid speed grade '%d'\n",
617 				 clk_wzrd->speed_grade);
618 			clk_wzrd->speed_grade = 0;
619 		}
620 	}
621 
622 	clk_wzrd->clk_in1 = devm_clk_get(&pdev->dev, "clk_in1");
623 	if (IS_ERR(clk_wzrd->clk_in1))
624 		return dev_err_probe(&pdev->dev, PTR_ERR(clk_wzrd->clk_in1),
625 				     "clk_in1 not found\n");
626 
627 	clk_wzrd->axi_clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
628 	if (IS_ERR(clk_wzrd->axi_clk))
629 		return dev_err_probe(&pdev->dev, PTR_ERR(clk_wzrd->axi_clk),
630 				     "s_axi_aclk not found\n");
631 	ret = clk_prepare_enable(clk_wzrd->axi_clk);
632 	if (ret) {
633 		dev_err(&pdev->dev, "enabling s_axi_aclk failed\n");
634 		return ret;
635 	}
636 	rate = clk_get_rate(clk_wzrd->axi_clk);
637 	if (rate > WZRD_ACLK_MAX_FREQ) {
638 		dev_err(&pdev->dev, "s_axi_aclk frequency (%lu) too high\n",
639 			rate);
640 		ret = -EINVAL;
641 		goto err_disable_clk;
642 	}
643 
644 	ret = of_property_read_u32(np, "xlnx,nr-outputs", &nr_outputs);
645 	if (ret || nr_outputs > WZRD_NUM_OUTPUTS) {
646 		ret = -EINVAL;
647 		goto err_disable_clk;
648 	}
649 
650 	clkout_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_out0", dev_name(&pdev->dev));
651 	if (!clkout_name) {
652 		ret = -ENOMEM;
653 		goto err_disable_clk;
654 	}
655 
656 	if (nr_outputs == 1) {
657 		clk_wzrd->clkout[0] = clk_wzrd_register_divider
658 				(&pdev->dev, clkout_name,
659 				__clk_get_name(clk_wzrd->clk_in1), 0,
660 				clk_wzrd->base, WZRD_CLK_CFG_REG(3),
661 				WZRD_CLKOUT_DIVIDE_SHIFT,
662 				WZRD_CLKOUT_DIVIDE_WIDTH,
663 				CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO,
664 				DIV_ALL, &clkwzrd_lock);
665 
666 		goto out;
667 	}
668 
669 	reg = readl(clk_wzrd->base + WZRD_CLK_CFG_REG(0));
670 	reg_f = reg & WZRD_CLKFBOUT_FRAC_MASK;
671 	reg_f =  reg_f >> WZRD_CLKFBOUT_FRAC_SHIFT;
672 
673 	reg = reg & WZRD_CLKFBOUT_MULT_MASK;
674 	reg =  reg >> WZRD_CLKFBOUT_MULT_SHIFT;
675 	mult = (reg * 1000) + reg_f;
676 	clk_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_mul", dev_name(&pdev->dev));
677 	if (!clk_name) {
678 		ret = -ENOMEM;
679 		goto err_disable_clk;
680 	}
681 	clk_wzrd->clks_internal[wzrd_clk_mul] = clk_register_fixed_factor
682 			(&pdev->dev, clk_name,
683 			 __clk_get_name(clk_wzrd->clk_in1),
684 			0, mult, 1000);
685 	if (IS_ERR(clk_wzrd->clks_internal[wzrd_clk_mul])) {
686 		dev_err(&pdev->dev, "unable to register fixed-factor clock\n");
687 		ret = PTR_ERR(clk_wzrd->clks_internal[wzrd_clk_mul]);
688 		goto err_disable_clk;
689 	}
690 
691 	clk_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_mul_div", dev_name(&pdev->dev));
692 	if (!clk_name) {
693 		ret = -ENOMEM;
694 		goto err_rm_int_clk;
695 	}
696 
697 	ctrl_reg = clk_wzrd->base + WZRD_CLK_CFG_REG(0);
698 	/* register div */
699 	clk_wzrd->clks_internal[wzrd_clk_mul_div] = clk_register_divider
700 			(&pdev->dev, clk_name,
701 			 __clk_get_name(clk_wzrd->clks_internal[wzrd_clk_mul]),
702 			flags, ctrl_reg, 0, 8, CLK_DIVIDER_ONE_BASED |
703 			CLK_DIVIDER_ALLOW_ZERO, &clkwzrd_lock);
704 	if (IS_ERR(clk_wzrd->clks_internal[wzrd_clk_mul_div])) {
705 		dev_err(&pdev->dev, "unable to register divider clock\n");
706 		ret = PTR_ERR(clk_wzrd->clks_internal[wzrd_clk_mul_div]);
707 		goto err_rm_int_clk;
708 	}
709 
710 	/* register div per output */
711 	for (i = nr_outputs - 1; i >= 0 ; i--) {
712 		clkout_name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
713 					     "%s_out%d", dev_name(&pdev->dev), i);
714 		if (!clkout_name) {
715 			ret = -ENOMEM;
716 			goto err_rm_int_clk;
717 		}
718 
719 		if (!i)
720 			clk_wzrd->clkout[i] = clk_wzrd_register_divf
721 				(&pdev->dev, clkout_name,
722 				clk_name, flags,
723 				clk_wzrd->base, (WZRD_CLK_CFG_REG(2) + i * 12),
724 				WZRD_CLKOUT_DIVIDE_SHIFT,
725 				WZRD_CLKOUT_DIVIDE_WIDTH,
726 				CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO,
727 				DIV_O, &clkwzrd_lock);
728 		else
729 			clk_wzrd->clkout[i] = clk_wzrd_register_divider
730 				(&pdev->dev, clkout_name,
731 				clk_name, 0,
732 				clk_wzrd->base, (WZRD_CLK_CFG_REG(2) + i * 12),
733 				WZRD_CLKOUT_DIVIDE_SHIFT,
734 				WZRD_CLKOUT_DIVIDE_WIDTH,
735 				CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO,
736 				DIV_O, &clkwzrd_lock);
737 		if (IS_ERR(clk_wzrd->clkout[i])) {
738 			int j;
739 
740 			for (j = i + 1; j < nr_outputs; j++)
741 				clk_unregister(clk_wzrd->clkout[j]);
742 			dev_err(&pdev->dev,
743 				"unable to register divider clock\n");
744 			ret = PTR_ERR(clk_wzrd->clkout[i]);
745 			goto err_rm_int_clks;
746 		}
747 	}
748 
749 out:
750 	clk_wzrd->clk_data.clks = clk_wzrd->clkout;
751 	clk_wzrd->clk_data.clk_num = ARRAY_SIZE(clk_wzrd->clkout);
752 	of_clk_add_provider(np, of_clk_src_onecell_get, &clk_wzrd->clk_data);
753 
754 	if (clk_wzrd->speed_grade) {
755 		clk_wzrd->nb.notifier_call = clk_wzrd_clk_notifier;
756 
757 		ret = clk_notifier_register(clk_wzrd->clk_in1,
758 					    &clk_wzrd->nb);
759 		if (ret)
760 			dev_warn(&pdev->dev,
761 				 "unable to register clock notifier\n");
762 
763 		ret = clk_notifier_register(clk_wzrd->axi_clk, &clk_wzrd->nb);
764 		if (ret)
765 			dev_warn(&pdev->dev,
766 				 "unable to register clock notifier\n");
767 	}
768 
769 	return 0;
770 
771 err_rm_int_clks:
772 	clk_unregister(clk_wzrd->clks_internal[1]);
773 err_rm_int_clk:
774 	clk_unregister(clk_wzrd->clks_internal[0]);
775 err_disable_clk:
776 	clk_disable_unprepare(clk_wzrd->axi_clk);
777 
778 	return ret;
779 }
780 
clk_wzrd_remove(struct platform_device * pdev)781 static void clk_wzrd_remove(struct platform_device *pdev)
782 {
783 	int i;
784 	struct clk_wzrd *clk_wzrd = platform_get_drvdata(pdev);
785 
786 	of_clk_del_provider(pdev->dev.of_node);
787 
788 	for (i = 0; i < WZRD_NUM_OUTPUTS; i++)
789 		clk_unregister(clk_wzrd->clkout[i]);
790 	for (i = 0; i < wzrd_clk_int_max; i++)
791 		clk_unregister(clk_wzrd->clks_internal[i]);
792 
793 	if (clk_wzrd->speed_grade) {
794 		clk_notifier_unregister(clk_wzrd->axi_clk, &clk_wzrd->nb);
795 		clk_notifier_unregister(clk_wzrd->clk_in1, &clk_wzrd->nb);
796 	}
797 
798 	clk_disable_unprepare(clk_wzrd->axi_clk);
799 }
800 
801 static const struct of_device_id clk_wzrd_ids[] = {
802 	{ .compatible = "xlnx,clocking-wizard" },
803 	{ .compatible = "xlnx,clocking-wizard-v5.2" },
804 	{ .compatible = "xlnx,clocking-wizard-v6.0" },
805 	{ },
806 };
807 MODULE_DEVICE_TABLE(of, clk_wzrd_ids);
808 
809 static struct platform_driver clk_wzrd_driver = {
810 	.driver = {
811 		.name = "clk-wizard",
812 		.of_match_table = clk_wzrd_ids,
813 		.pm = &clk_wzrd_dev_pm_ops,
814 	},
815 	.probe = clk_wzrd_probe,
816 	.remove_new = clk_wzrd_remove,
817 };
818 module_platform_driver(clk_wzrd_driver);
819 
820 MODULE_LICENSE("GPL");
821 MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com");
822 MODULE_DESCRIPTION("Driver for the Xilinx Clocking Wizard IP core");
823