1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Clock control for Cirrus EP93xx chips.
4  * Copyright (C) 2021 Nikita Shubin <nikita.shubin@maquefel.me>
5  *
6  * Based on a rewrite of arch/arm/mach-ep93xx/clock.c:
7  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
8  */
9 #define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt
10 
11 #include <linux/bits.h>
12 #include <linux/cleanup.h>
13 #include <linux/clk-provider.h>
14 #include <linux/math.h>
15 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
17 #include <linux/spinlock.h>
18 
19 #include <linux/soc/cirrus/ep93xx.h>
20 #include <dt-bindings/clock/cirrus,ep9301-syscon.h>
21 
22 #include <asm/div64.h>
23 
24 #define EP93XX_EXT_CLK_RATE		14745600
25 #define EP93XX_EXT_RTC_RATE		32768
26 
27 #define EP93XX_SYSCON_POWER_STATE	0x00
28 #define EP93XX_SYSCON_PWRCNT		0x04
29 #define EP93XX_SYSCON_PWRCNT_UARTBAUD	BIT(29)
30 #define EP93XX_SYSCON_PWRCNT_USH_EN	28
31 #define EP93XX_SYSCON_PWRCNT_DMA_M2M1	27
32 #define EP93XX_SYSCON_PWRCNT_DMA_M2M0	26
33 #define EP93XX_SYSCON_PWRCNT_DMA_M2P8	25
34 #define EP93XX_SYSCON_PWRCNT_DMA_M2P9	24
35 #define EP93XX_SYSCON_PWRCNT_DMA_M2P6	23
36 #define EP93XX_SYSCON_PWRCNT_DMA_M2P7	22
37 #define EP93XX_SYSCON_PWRCNT_DMA_M2P4	21
38 #define EP93XX_SYSCON_PWRCNT_DMA_M2P5	20
39 #define EP93XX_SYSCON_PWRCNT_DMA_M2P2	19
40 #define EP93XX_SYSCON_PWRCNT_DMA_M2P3	18
41 #define EP93XX_SYSCON_PWRCNT_DMA_M2P0	17
42 #define EP93XX_SYSCON_PWRCNT_DMA_M2P1	16
43 #define EP93XX_SYSCON_CLKSET1		0x20
44 #define EP93XX_SYSCON_CLKSET1_NBYP1	BIT(23)
45 #define EP93XX_SYSCON_CLKSET2		0x24
46 #define EP93XX_SYSCON_CLKSET2_NBYP2	BIT(19)
47 #define EP93XX_SYSCON_CLKSET2_PLL2_EN	BIT(18)
48 #define EP93XX_SYSCON_DEVCFG		0x80
49 #define EP93XX_SYSCON_DEVCFG_U3EN	24
50 #define EP93XX_SYSCON_DEVCFG_U2EN	20
51 #define EP93XX_SYSCON_DEVCFG_U1EN	18
52 #define EP93XX_SYSCON_VIDCLKDIV		0x84
53 #define EP93XX_SYSCON_CLKDIV_ENABLE	15
54 #define EP93XX_SYSCON_CLKDIV_ESEL	BIT(14)
55 #define EP93XX_SYSCON_CLKDIV_PSEL	BIT(13)
56 #define EP93XX_SYSCON_CLKDIV_MASK	GENMASK(14, 13)
57 #define EP93XX_SYSCON_CLKDIV_PDIV_SHIFT	8
58 #define EP93XX_SYSCON_I2SCLKDIV		0x8c
59 #define EP93XX_SYSCON_I2SCLKDIV_SENA	31
60 #define EP93XX_SYSCON_I2SCLKDIV_ORIDE	BIT(29)
61 #define EP93XX_SYSCON_I2SCLKDIV_SPOL	BIT(19)
62 #define EP93XX_SYSCON_KEYTCHCLKDIV	0x90
63 #define EP93XX_SYSCON_KEYTCHCLKDIV_TSEN	31
64 #define EP93XX_SYSCON_KEYTCHCLKDIV_ADIV	16
65 #define EP93XX_SYSCON_KEYTCHCLKDIV_KEN	15
66 #define EP93XX_SYSCON_KEYTCHCLKDIV_KDIV	0
67 #define EP93XX_SYSCON_CHIPID		0x94
68 #define EP93XX_SYSCON_CHIPID_ID		0x9213
69 
70 #define EP93XX_FIXED_CLK_COUNT		21
71 
72 static const char ep93xx_adc_divisors[] = { 16, 4 };
73 static const char ep93xx_sclk_divisors[] = { 2, 4 };
74 static const char ep93xx_lrclk_divisors[] = { 32, 64, 128 };
75 
76 struct ep93xx_clk {
77 	struct clk_hw hw;
78 	u16 idx;
79 	u16 reg;
80 	u32 mask;
81 	u8 bit_idx;
82 	u8 shift;
83 	u8 width;
84 	u8 num_div;
85 	const char *div;
86 };
87 
88 struct ep93xx_clk_priv {
89 	spinlock_t lock;
90 	struct ep93xx_regmap_adev *aux_dev;
91 	struct device *dev;
92 	void __iomem *base;
93 	struct regmap *map;
94 	struct clk_hw *fixed[EP93XX_FIXED_CLK_COUNT];
95 	struct ep93xx_clk reg[];
96 };
97 
ep93xx_clk_from(struct clk_hw * hw)98 static struct ep93xx_clk *ep93xx_clk_from(struct clk_hw *hw)
99 {
100 	return container_of(hw, struct ep93xx_clk, hw);
101 }
102 
ep93xx_priv_from(struct ep93xx_clk * clk)103 static struct ep93xx_clk_priv *ep93xx_priv_from(struct ep93xx_clk *clk)
104 {
105 	return container_of(clk, struct ep93xx_clk_priv, reg[clk->idx]);
106 }
107 
ep93xx_clk_write(struct ep93xx_clk_priv * priv,unsigned int reg,unsigned int val)108 static void ep93xx_clk_write(struct ep93xx_clk_priv *priv, unsigned int reg, unsigned int val)
109 {
110 	struct ep93xx_regmap_adev *aux = priv->aux_dev;
111 
112 	aux->write(aux->map, aux->lock, reg, val);
113 }
114 
ep93xx_clk_is_enabled(struct clk_hw * hw)115 static int ep93xx_clk_is_enabled(struct clk_hw *hw)
116 {
117 	struct ep93xx_clk *clk = ep93xx_clk_from(hw);
118 	struct ep93xx_clk_priv *priv = ep93xx_priv_from(clk);
119 	u32 val;
120 
121 	regmap_read(priv->map, clk->reg, &val);
122 
123 	return !!(val & BIT(clk->bit_idx));
124 }
125 
ep93xx_clk_enable(struct clk_hw * hw)126 static int ep93xx_clk_enable(struct clk_hw *hw)
127 {
128 	struct ep93xx_clk *clk = ep93xx_clk_from(hw);
129 	struct ep93xx_clk_priv *priv = ep93xx_priv_from(clk);
130 	u32 val;
131 
132 	guard(spinlock_irqsave)(&priv->lock);
133 
134 	regmap_read(priv->map, clk->reg, &val);
135 	val |= BIT(clk->bit_idx);
136 
137 	ep93xx_clk_write(priv, clk->reg, val);
138 
139 	return 0;
140 }
141 
ep93xx_clk_disable(struct clk_hw * hw)142 static void ep93xx_clk_disable(struct clk_hw *hw)
143 {
144 	struct ep93xx_clk *clk = ep93xx_clk_from(hw);
145 	struct ep93xx_clk_priv *priv = ep93xx_priv_from(clk);
146 	u32 val;
147 
148 	guard(spinlock_irqsave)(&priv->lock);
149 
150 	regmap_read(priv->map, clk->reg, &val);
151 	val &= ~BIT(clk->bit_idx);
152 
153 	ep93xx_clk_write(priv, clk->reg, val);
154 }
155 
156 static const struct clk_ops clk_ep93xx_gate_ops = {
157 	.enable = ep93xx_clk_enable,
158 	.disable = ep93xx_clk_disable,
159 	.is_enabled = ep93xx_clk_is_enabled,
160 };
161 
ep93xx_clk_register_gate(struct ep93xx_clk * clk,const char * name,struct clk_parent_data * parent_data,unsigned long flags,unsigned int reg,u8 bit_idx)162 static int ep93xx_clk_register_gate(struct ep93xx_clk *clk,
163 				    const char *name,
164 				    struct clk_parent_data *parent_data,
165 				    unsigned long flags,
166 				    unsigned int reg,
167 				    u8 bit_idx)
168 {
169 	struct ep93xx_clk_priv *priv = ep93xx_priv_from(clk);
170 	struct clk_init_data init = { };
171 
172 	init.name = name;
173 	init.ops = &clk_ep93xx_gate_ops;
174 	init.flags = flags;
175 	init.parent_data = parent_data;
176 	init.num_parents = 1;
177 
178 	clk->reg = reg;
179 	clk->bit_idx = bit_idx;
180 	clk->hw.init = &init;
181 
182 	return devm_clk_hw_register(priv->dev, &clk->hw);
183 }
184 
ep93xx_mux_get_parent(struct clk_hw * hw)185 static u8 ep93xx_mux_get_parent(struct clk_hw *hw)
186 {
187 	struct ep93xx_clk *clk = ep93xx_clk_from(hw);
188 	struct ep93xx_clk_priv *priv = ep93xx_priv_from(clk);
189 	u32 val;
190 
191 	regmap_read(priv->map, clk->reg, &val);
192 
193 	val &= EP93XX_SYSCON_CLKDIV_MASK;
194 
195 	switch (val) {
196 	case EP93XX_SYSCON_CLKDIV_ESEL:
197 		return 1; /* PLL1 */
198 	case EP93XX_SYSCON_CLKDIV_MASK:
199 		return 2; /* PLL2 */
200 	default:
201 		return 0; /* XTALI */
202 	};
203 }
204 
ep93xx_mux_set_parent_lock(struct clk_hw * hw,u8 index)205 static int ep93xx_mux_set_parent_lock(struct clk_hw *hw, u8 index)
206 {
207 	struct ep93xx_clk *clk = ep93xx_clk_from(hw);
208 	struct ep93xx_clk_priv *priv = ep93xx_priv_from(clk);
209 	u32 val;
210 
211 	if (index >= 3)
212 		return -EINVAL;
213 
214 	guard(spinlock_irqsave)(&priv->lock);
215 
216 	regmap_read(priv->map, clk->reg, &val);
217 	val &= ~(EP93XX_SYSCON_CLKDIV_MASK);
218 	val |= index > 0 ? EP93XX_SYSCON_CLKDIV_ESEL : 0;
219 	val |= index > 1 ? EP93XX_SYSCON_CLKDIV_PSEL : 0;
220 
221 	ep93xx_clk_write(priv, clk->reg, val);
222 
223 	return 0;
224 }
225 
is_best(unsigned long rate,unsigned long now,unsigned long best)226 static bool is_best(unsigned long rate, unsigned long now,
227 		     unsigned long best)
228 {
229 	return abs_diff(rate, now) < abs_diff(rate, best);
230 }
231 
ep93xx_mux_determine_rate(struct clk_hw * hw,struct clk_rate_request * req)232 static int ep93xx_mux_determine_rate(struct clk_hw *hw,
233 				struct clk_rate_request *req)
234 {
235 	unsigned long best_rate = 0, actual_rate, mclk_rate;
236 	unsigned long rate = req->rate;
237 	struct clk_hw *parent_best = NULL;
238 	unsigned long parent_rate_best;
239 	unsigned long parent_rate;
240 	int div, pdiv;
241 	unsigned int i;
242 
243 	/*
244 	 * Try the two pll's and the external clock,
245 	 * because the valid predividers are 2, 2.5 and 3, we multiply
246 	 * all the clocks by 2 to avoid floating point math.
247 	 *
248 	 * This is based on the algorithm in the ep93xx raster guide:
249 	 * http://be-a-maverick.com/en/pubs/appNote/AN269REV1.pdf
250 	 *
251 	 */
252 	for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
253 		struct clk_hw *parent = clk_hw_get_parent_by_index(hw, i);
254 
255 		parent_rate = clk_hw_get_rate(parent);
256 		mclk_rate = parent_rate * 2;
257 
258 		/* Try each predivider value */
259 		for (pdiv = 4; pdiv <= 6; pdiv++) {
260 			div = DIV_ROUND_CLOSEST(mclk_rate, rate * pdiv);
261 			if (!in_range(div, 1, 127))
262 				continue;
263 
264 			actual_rate = DIV_ROUND_CLOSEST(mclk_rate, pdiv * div);
265 			if (is_best(rate, actual_rate, best_rate)) {
266 				best_rate = actual_rate;
267 				parent_rate_best = parent_rate;
268 				parent_best = parent;
269 			}
270 		}
271 	}
272 
273 	if (!parent_best)
274 		return -EINVAL;
275 
276 	req->best_parent_rate = parent_rate_best;
277 	req->best_parent_hw = parent_best;
278 	req->rate = best_rate;
279 
280 	return 0;
281 }
282 
ep93xx_ddiv_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)283 static unsigned long ep93xx_ddiv_recalc_rate(struct clk_hw *hw,
284 						unsigned long parent_rate)
285 {
286 	struct ep93xx_clk *clk = ep93xx_clk_from(hw);
287 	struct ep93xx_clk_priv *priv = ep93xx_priv_from(clk);
288 	unsigned int pdiv, div;
289 	u32 val;
290 
291 	regmap_read(priv->map, clk->reg, &val);
292 	pdiv = (val >> EP93XX_SYSCON_CLKDIV_PDIV_SHIFT) & GENMASK(1, 0);
293 	div = val & GENMASK(6, 0);
294 	if (!div)
295 		return 0;
296 
297 	return DIV_ROUND_CLOSEST(parent_rate * 2, (pdiv + 3) * div);
298 }
299 
ep93xx_ddiv_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)300 static int ep93xx_ddiv_set_rate(struct clk_hw *hw, unsigned long rate,
301 				unsigned long parent_rate)
302 {
303 	struct ep93xx_clk *clk = ep93xx_clk_from(hw);
304 	struct ep93xx_clk_priv *priv = ep93xx_priv_from(clk);
305 	int pdiv, div, npdiv, ndiv;
306 	unsigned long actual_rate, mclk_rate, rate_err = ULONG_MAX;
307 	u32 val;
308 
309 	regmap_read(priv->map, clk->reg, &val);
310 	mclk_rate = parent_rate * 2;
311 
312 	for (pdiv = 4; pdiv <= 6; pdiv++) {
313 		div = DIV_ROUND_CLOSEST(mclk_rate, rate * pdiv);
314 		if (!in_range(div, 1, 127))
315 			continue;
316 
317 		actual_rate = DIV_ROUND_CLOSEST(mclk_rate, pdiv * div);
318 		if (abs(actual_rate - rate) < rate_err) {
319 			npdiv = pdiv - 3;
320 			ndiv = div;
321 			rate_err = abs(actual_rate - rate);
322 		}
323 	}
324 
325 	if (rate_err == ULONG_MAX)
326 		return -EINVAL;
327 
328 	/*
329 	 * Clear old dividers.
330 	 * Bit 7 is reserved bit in all ClkDiv registers.
331 	 */
332 	val &= ~(GENMASK(9, 0) & ~BIT(7));
333 
334 	/* Set the new pdiv and div bits for the new clock rate */
335 	val |= (npdiv << EP93XX_SYSCON_CLKDIV_PDIV_SHIFT) | ndiv;
336 
337 	ep93xx_clk_write(priv, clk->reg, val);
338 
339 	return 0;
340 }
341 
342 static const struct clk_ops clk_ddiv_ops = {
343 	.enable = ep93xx_clk_enable,
344 	.disable = ep93xx_clk_disable,
345 	.is_enabled = ep93xx_clk_is_enabled,
346 	.get_parent = ep93xx_mux_get_parent,
347 	.set_parent = ep93xx_mux_set_parent_lock,
348 	.determine_rate = ep93xx_mux_determine_rate,
349 	.recalc_rate = ep93xx_ddiv_recalc_rate,
350 	.set_rate = ep93xx_ddiv_set_rate,
351 };
352 
ep93xx_clk_register_ddiv(struct ep93xx_clk * clk,const char * name,struct clk_parent_data * parent_data,u8 num_parents,unsigned int reg,u8 bit_idx)353 static int ep93xx_clk_register_ddiv(struct ep93xx_clk *clk,
354 				const char *name,
355 				struct clk_parent_data *parent_data,
356 				u8 num_parents,
357 				unsigned int reg,
358 				u8 bit_idx)
359 {
360 	struct ep93xx_clk_priv *priv = ep93xx_priv_from(clk);
361 	struct clk_init_data init = { };
362 
363 	init.name = name;
364 	init.ops = &clk_ddiv_ops;
365 	init.flags = 0;
366 	init.parent_data = parent_data;
367 	init.num_parents = num_parents;
368 
369 	clk->reg = reg;
370 	clk->bit_idx = bit_idx;
371 	clk->hw.init = &init;
372 
373 	return devm_clk_hw_register(priv->dev, &clk->hw);
374 }
375 
ep93xx_div_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)376 static unsigned long ep93xx_div_recalc_rate(struct clk_hw *hw,
377 					    unsigned long parent_rate)
378 {
379 	struct ep93xx_clk *clk = ep93xx_clk_from(hw);
380 	struct ep93xx_clk_priv *priv = ep93xx_priv_from(clk);
381 	u32 val;
382 	u8 index;
383 
384 	regmap_read(priv->map, clk->reg, &val);
385 	index = (val & clk->mask) >> clk->shift;
386 	if (index >= clk->num_div)
387 		return 0;
388 
389 	return DIV_ROUND_CLOSEST(parent_rate, clk->div[index]);
390 }
391 
ep93xx_div_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * parent_rate)392 static long ep93xx_div_round_rate(struct clk_hw *hw, unsigned long rate,
393 				   unsigned long *parent_rate)
394 {
395 	struct ep93xx_clk *clk = ep93xx_clk_from(hw);
396 	unsigned long best = 0, now;
397 	unsigned int i;
398 
399 	for (i = 0; i < clk->num_div; i++) {
400 		if ((rate * clk->div[i]) == *parent_rate)
401 			return rate;
402 
403 		now = DIV_ROUND_CLOSEST(*parent_rate, clk->div[i]);
404 		if (!best || is_best(rate, now, best))
405 			best = now;
406 	}
407 
408 	return best;
409 }
410 
ep93xx_div_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)411 static int ep93xx_div_set_rate(struct clk_hw *hw, unsigned long rate,
412 			       unsigned long parent_rate)
413 {
414 	struct ep93xx_clk *clk = ep93xx_clk_from(hw);
415 	struct ep93xx_clk_priv *priv = ep93xx_priv_from(clk);
416 	unsigned int i;
417 	u32 val;
418 
419 	regmap_read(priv->map, clk->reg, &val);
420 	val &= ~clk->mask;
421 	for (i = 0; i < clk->num_div; i++)
422 		if (rate == DIV_ROUND_CLOSEST(parent_rate, clk->div[i]))
423 			break;
424 
425 	if (i == clk->num_div)
426 		return -EINVAL;
427 
428 	val |= i << clk->shift;
429 
430 	ep93xx_clk_write(priv, clk->reg, val);
431 
432 	return 0;
433 }
434 
435 static const struct clk_ops ep93xx_div_ops = {
436 	.enable = ep93xx_clk_enable,
437 	.disable = ep93xx_clk_disable,
438 	.is_enabled = ep93xx_clk_is_enabled,
439 	.recalc_rate = ep93xx_div_recalc_rate,
440 	.round_rate = ep93xx_div_round_rate,
441 	.set_rate = ep93xx_div_set_rate,
442 };
443 
ep93xx_register_div(struct ep93xx_clk * clk,const char * name,const struct clk_parent_data * parent_data,unsigned int reg,u8 enable_bit,u8 shift,u8 width,const char * clk_divisors,u8 num_div)444 static int ep93xx_register_div(struct ep93xx_clk *clk,
445 			       const char *name,
446 			       const struct clk_parent_data *parent_data,
447 			       unsigned int reg,
448 			       u8 enable_bit,
449 			       u8 shift,
450 			       u8 width,
451 			       const char *clk_divisors,
452 			       u8 num_div)
453 {
454 	struct ep93xx_clk_priv *priv = ep93xx_priv_from(clk);
455 	struct clk_init_data init = { };
456 
457 	init.name = name;
458 	init.ops = &ep93xx_div_ops;
459 	init.flags = 0;
460 	init.parent_data = parent_data;
461 	init.num_parents = 1;
462 
463 	clk->reg = reg;
464 	clk->bit_idx = enable_bit;
465 	clk->mask = GENMASK(shift + width - 1, shift);
466 	clk->shift = shift;
467 	clk->div = clk_divisors;
468 	clk->num_div = num_div;
469 	clk->hw.init = &init;
470 
471 	return devm_clk_hw_register(priv->dev, &clk->hw);
472 }
473 
474 struct ep93xx_gate {
475 	unsigned int idx;
476 	unsigned int bit;
477 	const char *name;
478 };
479 
480 static const struct ep93xx_gate ep93xx_uarts[] = {
481 	{ EP93XX_CLK_UART1, EP93XX_SYSCON_DEVCFG_U1EN, "uart1" },
482 	{ EP93XX_CLK_UART2, EP93XX_SYSCON_DEVCFG_U2EN, "uart2" },
483 	{ EP93XX_CLK_UART3, EP93XX_SYSCON_DEVCFG_U3EN, "uart3" },
484 };
485 
ep93xx_uart_clock_init(struct ep93xx_clk_priv * priv)486 static int ep93xx_uart_clock_init(struct ep93xx_clk_priv *priv)
487 {
488 	struct clk_parent_data parent_data = { };
489 	unsigned int i, idx, ret, clk_uart_div;
490 	struct ep93xx_clk *clk;
491 	u32 val;
492 
493 	regmap_read(priv->map, EP93XX_SYSCON_PWRCNT, &val);
494 	if (val & EP93XX_SYSCON_PWRCNT_UARTBAUD)
495 		clk_uart_div = 1;
496 	else
497 		clk_uart_div = 2;
498 
499 	priv->fixed[EP93XX_CLK_UART] =
500 		devm_clk_hw_register_fixed_factor_index(priv->dev, "uart",
501 							0, /* XTALI external clock */
502 							0, 1, clk_uart_div);
503 	parent_data.hw = priv->fixed[EP93XX_CLK_UART];
504 
505 	/* parenting uart gate clocks to uart clock */
506 	for (i = 0; i < ARRAY_SIZE(ep93xx_uarts); i++) {
507 		idx = ep93xx_uarts[i].idx - EP93XX_CLK_UART1;
508 		clk = &priv->reg[idx];
509 		clk->idx = idx;
510 		ret = ep93xx_clk_register_gate(clk,
511 					ep93xx_uarts[i].name,
512 					&parent_data, CLK_SET_RATE_PARENT,
513 					EP93XX_SYSCON_DEVCFG,
514 					ep93xx_uarts[i].bit);
515 		if (ret)
516 			return dev_err_probe(priv->dev, ret,
517 					     "failed to register uart[%d] clock\n", i);
518 	}
519 
520 	return 0;
521 }
522 
523 static const struct ep93xx_gate ep93xx_dmas[] = {
524 	{ EP93XX_CLK_M2M0, EP93XX_SYSCON_PWRCNT_DMA_M2M0, "m2m0" },
525 	{ EP93XX_CLK_M2M1, EP93XX_SYSCON_PWRCNT_DMA_M2M1, "m2m1" },
526 	{ EP93XX_CLK_M2P0, EP93XX_SYSCON_PWRCNT_DMA_M2P0, "m2p0" },
527 	{ EP93XX_CLK_M2P1, EP93XX_SYSCON_PWRCNT_DMA_M2P1, "m2p1" },
528 	{ EP93XX_CLK_M2P2, EP93XX_SYSCON_PWRCNT_DMA_M2P2, "m2p2" },
529 	{ EP93XX_CLK_M2P3, EP93XX_SYSCON_PWRCNT_DMA_M2P3, "m2p3" },
530 	{ EP93XX_CLK_M2P4, EP93XX_SYSCON_PWRCNT_DMA_M2P4, "m2p4" },
531 	{ EP93XX_CLK_M2P5, EP93XX_SYSCON_PWRCNT_DMA_M2P5, "m2p5" },
532 	{ EP93XX_CLK_M2P6, EP93XX_SYSCON_PWRCNT_DMA_M2P6, "m2p6" },
533 	{ EP93XX_CLK_M2P7, EP93XX_SYSCON_PWRCNT_DMA_M2P7, "m2p7" },
534 	{ EP93XX_CLK_M2P8, EP93XX_SYSCON_PWRCNT_DMA_M2P8, "m2p8" },
535 	{ EP93XX_CLK_M2P9, EP93XX_SYSCON_PWRCNT_DMA_M2P9, "m2p9" },
536 };
537 
ep93xx_dma_clock_init(struct ep93xx_clk_priv * priv)538 static int ep93xx_dma_clock_init(struct ep93xx_clk_priv *priv)
539 {
540 	struct clk_parent_data parent_data = { };
541 	unsigned int i, idx;
542 
543 	parent_data.hw = priv->fixed[EP93XX_CLK_HCLK];
544 	for (i = 0; i < ARRAY_SIZE(ep93xx_dmas); i++) {
545 		idx = ep93xx_dmas[i].idx;
546 		priv->fixed[idx] = devm_clk_hw_register_gate_parent_data(priv->dev,
547 					ep93xx_dmas[i].name,
548 					&parent_data, 0,
549 					priv->base + EP93XX_SYSCON_PWRCNT,
550 					ep93xx_dmas[i].bit,
551 					0,
552 					&priv->lock);
553 		if (IS_ERR(priv->fixed[idx]))
554 			return PTR_ERR(priv->fixed[idx]);
555 	}
556 
557 	return 0;
558 }
559 
of_clk_ep93xx_get(struct of_phandle_args * clkspec,void * data)560 static struct clk_hw *of_clk_ep93xx_get(struct of_phandle_args *clkspec, void *data)
561 {
562 	struct ep93xx_clk_priv *priv = data;
563 	unsigned int idx = clkspec->args[0];
564 
565 	if (idx < EP93XX_CLK_UART1)
566 		return priv->fixed[idx];
567 
568 	if (idx <= EP93XX_CLK_I2S_LRCLK)
569 		return &priv->reg[idx - EP93XX_CLK_UART1].hw;
570 
571 	return ERR_PTR(-EINVAL);
572 }
573 
574 /*
575  * PLL rate = 14.7456 MHz * (X1FBD + 1) * (X2FBD + 1) / (X2IPD + 1) / 2^PS
576  */
calc_pll_rate(u64 rate,u32 config_word)577 static unsigned long calc_pll_rate(u64 rate, u32 config_word)
578 {
579 	rate *= ((config_word >> 11) & GENMASK(4, 0)) + 1;	/* X1FBD */
580 	rate *= ((config_word >> 5) & GENMASK(5, 0)) + 1;	/* X2FBD */
581 	do_div(rate, (config_word & GENMASK(4, 0)) + 1);	/* X2IPD */
582 	rate >>= (config_word >> 16) & GENMASK(1, 0);		/* PS */
583 
584 	return rate;
585 }
586 
ep93xx_plls_init(struct ep93xx_clk_priv * priv)587 static int ep93xx_plls_init(struct ep93xx_clk_priv *priv)
588 {
589 	const char fclk_divisors[] = { 1, 2, 4, 8, 16, 1, 1, 1 };
590 	const char hclk_divisors[] = { 1, 2, 4, 5, 6, 8, 16, 32 };
591 	const char pclk_divisors[] = { 1, 2, 4, 8 };
592 	struct clk_parent_data xtali = { .index = 0 };
593 	unsigned int clk_f_div, clk_h_div, clk_p_div;
594 	unsigned long clk_pll1_rate, clk_pll2_rate;
595 	struct device *dev = priv->dev;
596 	struct clk_hw *hw, *pll1;
597 	u32 value;
598 
599 	/* Determine the bootloader configured pll1 rate */
600 	regmap_read(priv->map, EP93XX_SYSCON_CLKSET1, &value);
601 
602 	if (value & EP93XX_SYSCON_CLKSET1_NBYP1)
603 		clk_pll1_rate = calc_pll_rate(EP93XX_EXT_CLK_RATE, value);
604 	else
605 		clk_pll1_rate = EP93XX_EXT_CLK_RATE;
606 
607 	pll1 = devm_clk_hw_register_fixed_rate_parent_data(dev, "pll1", &xtali,
608 								  0, clk_pll1_rate);
609 	if (IS_ERR(pll1))
610 		return PTR_ERR(pll1);
611 
612 	priv->fixed[EP93XX_CLK_PLL1] = pll1;
613 
614 	/* Initialize the pll1 derived clocks */
615 	clk_f_div = fclk_divisors[(value >> 25) & GENMASK(2, 0)];
616 	clk_h_div = hclk_divisors[(value >> 20) & GENMASK(2, 0)];
617 	clk_p_div = pclk_divisors[(value >> 18) & GENMASK(1, 0)];
618 
619 	hw = devm_clk_hw_register_fixed_factor_parent_hw(dev, "fclk", pll1, 0, 1, clk_f_div);
620 	if (IS_ERR(hw))
621 		return PTR_ERR(hw);
622 
623 	priv->fixed[EP93XX_CLK_FCLK] = hw;
624 
625 	hw = devm_clk_hw_register_fixed_factor_parent_hw(dev, "hclk", pll1, 0, 1, clk_h_div);
626 	if (IS_ERR(hw))
627 		return PTR_ERR(hw);
628 
629 	priv->fixed[EP93XX_CLK_HCLK] = hw;
630 
631 	hw = devm_clk_hw_register_fixed_factor_parent_hw(dev, "pclk", hw, 0, 1, clk_p_div);
632 	if (IS_ERR(hw))
633 		return PTR_ERR(hw);
634 
635 	priv->fixed[EP93XX_CLK_PCLK] = hw;
636 
637 	/* Determine the bootloader configured pll2 rate */
638 	regmap_read(priv->map, EP93XX_SYSCON_CLKSET2, &value);
639 	if (!(value & EP93XX_SYSCON_CLKSET2_NBYP2))
640 		clk_pll2_rate = EP93XX_EXT_CLK_RATE;
641 	else if (value & EP93XX_SYSCON_CLKSET2_PLL2_EN)
642 		clk_pll2_rate = calc_pll_rate(EP93XX_EXT_CLK_RATE, value);
643 	else
644 		clk_pll2_rate = 0;
645 
646 	hw = devm_clk_hw_register_fixed_rate_parent_data(dev, "pll2", &xtali,
647 								0, clk_pll2_rate);
648 	if (IS_ERR(hw))
649 		return PTR_ERR(hw);
650 
651 	priv->fixed[EP93XX_CLK_PLL2] = hw;
652 
653 	return 0;
654 }
655 
ep93xx_clk_probe(struct auxiliary_device * adev,const struct auxiliary_device_id * id)656 static int ep93xx_clk_probe(struct auxiliary_device *adev,
657 			       const struct auxiliary_device_id *id)
658 {
659 	struct ep93xx_regmap_adev *rdev = to_ep93xx_regmap_adev(adev);
660 	struct clk_parent_data xtali = { .index = 0 };
661 	struct clk_parent_data ddiv_pdata[3] = { };
662 	unsigned int clk_spi_div, clk_usb_div;
663 	struct clk_parent_data pdata = {};
664 	struct device *dev = &adev->dev;
665 	struct ep93xx_clk_priv *priv;
666 	struct ep93xx_clk *clk;
667 	struct clk_hw *hw;
668 	unsigned int idx;
669 	int ret;
670 	u32 value;
671 
672 	priv = devm_kzalloc(dev, struct_size(priv, reg, 10), GFP_KERNEL);
673 	if (!priv)
674 		return -ENOMEM;
675 
676 	spin_lock_init(&priv->lock);
677 	priv->dev = dev;
678 	priv->aux_dev = rdev;
679 	priv->map = rdev->map;
680 	priv->base = rdev->base;
681 
682 	ret = ep93xx_plls_init(priv);
683 	if (ret)
684 		return ret;
685 
686 	regmap_read(priv->map, EP93XX_SYSCON_CLKSET2, &value);
687 	clk_usb_div = (value >> 28 & GENMASK(3, 0)) + 1;
688 	hw = devm_clk_hw_register_fixed_factor_parent_hw(dev, "usb_clk",
689 							 priv->fixed[EP93XX_CLK_PLL2], 0, 1,
690 							 clk_usb_div);
691 	if (IS_ERR(hw))
692 		return PTR_ERR(hw);
693 
694 	priv->fixed[EP93XX_CLK_USB] = hw;
695 
696 	ret = ep93xx_uart_clock_init(priv);
697 	if (ret)
698 		return ret;
699 
700 	ret = ep93xx_dma_clock_init(priv);
701 	if (ret)
702 		return ret;
703 
704 	clk_spi_div = id->driver_data;
705 	hw = devm_clk_hw_register_fixed_factor_index(dev, "ep93xx-spi.0",
706 						     0, /* XTALI external clock */
707 						     0, 1, clk_spi_div);
708 	if (IS_ERR(hw))
709 		return PTR_ERR(hw);
710 
711 	priv->fixed[EP93XX_CLK_SPI] = hw;
712 
713 	/* PWM clock */
714 	hw = devm_clk_hw_register_fixed_factor_index(dev, "pwm_clk", 0, /* XTALI external clock */
715 						     0, 1, 1);
716 	if (IS_ERR(hw))
717 		return PTR_ERR(hw);
718 
719 	priv->fixed[EP93XX_CLK_PWM] = hw;
720 
721 	/* USB clock */
722 	pdata.hw = priv->fixed[EP93XX_CLK_USB];
723 	hw = devm_clk_hw_register_gate_parent_data(priv->dev, "ohci-platform", &pdata,
724 						   0, priv->base + EP93XX_SYSCON_PWRCNT,
725 						   EP93XX_SYSCON_PWRCNT_USH_EN, 0,
726 						   &priv->lock);
727 	if (IS_ERR(hw))
728 		return PTR_ERR(hw);
729 
730 	priv->fixed[EP93XX_CLK_USB] = hw;
731 
732 	ddiv_pdata[0].index = 0; /* XTALI external clock */
733 	ddiv_pdata[1].hw = priv->fixed[EP93XX_CLK_PLL1];
734 	ddiv_pdata[2].hw = priv->fixed[EP93XX_CLK_PLL2];
735 
736 	/* touchscreen/ADC clock */
737 	idx = EP93XX_CLK_ADC - EP93XX_CLK_UART1;
738 	clk = &priv->reg[idx];
739 	clk->idx = idx;
740 	ret = ep93xx_register_div(clk, "ep93xx-adc", &xtali,
741 				EP93XX_SYSCON_KEYTCHCLKDIV,
742 				EP93XX_SYSCON_KEYTCHCLKDIV_TSEN,
743 				EP93XX_SYSCON_KEYTCHCLKDIV_ADIV,
744 				1,
745 				ep93xx_adc_divisors,
746 				ARRAY_SIZE(ep93xx_adc_divisors));
747 
748 
749 	/* keypad clock */
750 	idx = EP93XX_CLK_KEYPAD - EP93XX_CLK_UART1;
751 	clk = &priv->reg[idx];
752 	clk->idx = idx;
753 	ret = ep93xx_register_div(clk, "ep93xx-keypad", &xtali,
754 				EP93XX_SYSCON_KEYTCHCLKDIV,
755 				EP93XX_SYSCON_KEYTCHCLKDIV_KEN,
756 				EP93XX_SYSCON_KEYTCHCLKDIV_KDIV,
757 				1,
758 				ep93xx_adc_divisors,
759 				ARRAY_SIZE(ep93xx_adc_divisors));
760 
761 	/*
762 	 * On reset PDIV and VDIV is set to zero, while PDIV zero
763 	 * means clock disable, VDIV shouldn't be zero.
764 	 * So we set both video and i2s dividers to minimum.
765 	 * ENA - Enable CLK divider.
766 	 * PDIV - 00 - Disable clock
767 	 * VDIV - at least 2
768 	 */
769 
770 	/* Check and enable video clk registers */
771 	regmap_read(priv->map, EP93XX_SYSCON_VIDCLKDIV, &value);
772 	value |= BIT(EP93XX_SYSCON_CLKDIV_PDIV_SHIFT) | 2;
773 	ep93xx_clk_write(priv, EP93XX_SYSCON_VIDCLKDIV, value);
774 
775 	/* Check and enable i2s clk registers */
776 	regmap_read(priv->map, EP93XX_SYSCON_I2SCLKDIV, &value);
777 	value |= BIT(EP93XX_SYSCON_CLKDIV_PDIV_SHIFT) | 2;
778 
779 	/*
780 	 * Override the SAI_MSTR_CLK_CFG from the I2S block and use the
781 	 * I2SClkDiv Register settings. LRCLK transitions on the falling SCLK
782 	 * edge.
783 	 */
784 	value |= EP93XX_SYSCON_I2SCLKDIV_ORIDE | EP93XX_SYSCON_I2SCLKDIV_SPOL;
785 	ep93xx_clk_write(priv, EP93XX_SYSCON_I2SCLKDIV, value);
786 
787 	/* video clk */
788 	idx = EP93XX_CLK_VIDEO - EP93XX_CLK_UART1;
789 	clk = &priv->reg[idx];
790 	clk->idx = idx;
791 	ret = ep93xx_clk_register_ddiv(clk, "ep93xx-fb",
792 				ddiv_pdata, ARRAY_SIZE(ddiv_pdata),
793 				EP93XX_SYSCON_VIDCLKDIV,
794 				EP93XX_SYSCON_CLKDIV_ENABLE);
795 
796 	/* i2s clk */
797 	idx = EP93XX_CLK_I2S_MCLK - EP93XX_CLK_UART1;
798 	clk = &priv->reg[idx];
799 	clk->idx = idx;
800 	ret = ep93xx_clk_register_ddiv(clk, "mclk",
801 				ddiv_pdata, ARRAY_SIZE(ddiv_pdata),
802 				EP93XX_SYSCON_I2SCLKDIV,
803 				EP93XX_SYSCON_CLKDIV_ENABLE);
804 
805 	/* i2s sclk */
806 	idx = EP93XX_CLK_I2S_SCLK - EP93XX_CLK_UART1;
807 	clk = &priv->reg[idx];
808 	clk->idx = idx;
809 	pdata.hw = &priv->reg[EP93XX_CLK_I2S_MCLK - EP93XX_CLK_UART1].hw;
810 	ret = ep93xx_register_div(clk, "sclk", &pdata,
811 				EP93XX_SYSCON_I2SCLKDIV,
812 				EP93XX_SYSCON_I2SCLKDIV_SENA,
813 				16, /* EP93XX_I2SCLKDIV_SDIV_SHIFT */
814 				1,  /* EP93XX_I2SCLKDIV_SDIV_WIDTH */
815 				ep93xx_sclk_divisors,
816 				ARRAY_SIZE(ep93xx_sclk_divisors));
817 
818 	/* i2s lrclk */
819 	idx = EP93XX_CLK_I2S_LRCLK - EP93XX_CLK_UART1;
820 	clk = &priv->reg[idx];
821 	clk->idx = idx;
822 	pdata.hw = &priv->reg[EP93XX_CLK_I2S_SCLK - EP93XX_CLK_UART1].hw;
823 	ret = ep93xx_register_div(clk, "lrclk", &pdata,
824 				EP93XX_SYSCON_I2SCLKDIV,
825 				EP93XX_SYSCON_I2SCLKDIV_SENA,
826 				17, /* EP93XX_I2SCLKDIV_LRDIV32_SHIFT */
827 				2,  /* EP93XX_I2SCLKDIV_LRDIV32_WIDTH */
828 				ep93xx_lrclk_divisors,
829 				ARRAY_SIZE(ep93xx_lrclk_divisors));
830 
831 	/* IrDa clk uses same pattern but no init code presents in original clock driver */
832 	return devm_of_clk_add_hw_provider(priv->dev, of_clk_ep93xx_get, priv);
833 }
834 
835 static const struct auxiliary_device_id ep93xx_clk_ids[] = {
836 	{ .name = "soc_ep93xx.clk-ep93xx", .driver_data = 2, },
837 	{ .name = "soc_ep93xx.clk-ep93xx.e2", .driver_data = 1, },
838 	{ /* sentinel */ }
839 };
840 MODULE_DEVICE_TABLE(auxiliary, ep93xx_clk_ids);
841 
842 static struct auxiliary_driver ep93xx_clk_driver = {
843 	.probe		= ep93xx_clk_probe,
844 	.id_table	= ep93xx_clk_ids,
845 };
846 module_auxiliary_driver(ep93xx_clk_driver);
847 
848 MODULE_LICENSE("GPL");
849 MODULE_AUTHOR("Nikita Shubin <nikita.shubin@maquefel.me>");
850 MODULE_DESCRIPTION("Clock control for Cirrus EP93xx chips");
851