xref: /linux/drivers/clk/mmp/clk-audio.c (revision 522ba450b56fff29f868b1552bdc2965f55de7ed)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * MMP Audio Clock Controller driver
4  *
5  * Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk>
6  */
7 
8 #include <linux/clk-provider.h>
9 #include <linux/io.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/pm_clock.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/slab.h>
15 #include <dt-bindings/clock/marvell,mmp2-audio.h>
16 
17 /* Audio Controller Registers */
18 #define SSPA_AUD_CTRL				0x04
19 #define SSPA_AUD_PLL_CTRL0			0x08
20 #define SSPA_AUD_PLL_CTRL1			0x0c
21 
22 /* SSPA Audio Control Register */
23 #define SSPA_AUD_CTRL_SYSCLK_SHIFT		0
24 #define SSPA_AUD_CTRL_SYSCLK_DIV_SHIFT		1
25 #define SSPA_AUD_CTRL_SSPA0_MUX_SHIFT		7
26 #define SSPA_AUD_CTRL_SSPA0_SHIFT		8
27 #define SSPA_AUD_CTRL_SSPA0_DIV_SHIFT		9
28 #define SSPA_AUD_CTRL_SSPA1_SHIFT		16
29 #define SSPA_AUD_CTRL_SSPA1_DIV_SHIFT		17
30 #define SSPA_AUD_CTRL_SSPA1_MUX_SHIFT		23
31 #define SSPA_AUD_CTRL_DIV_MASK			0x7e
32 
33 /* SSPA Audio PLL Control 0 Register */
34 #define SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO_MASK (0x7 << 28)
35 #define SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(x)	((x) << 28)
36 #define SSPA_AUD_PLL_CTRL0_FRACT_MASK		(0xfffff << 8)
37 #define SSPA_AUD_PLL_CTRL0_FRACT(x)		((x) << 8)
38 #define SSPA_AUD_PLL_CTRL0_ENA_DITHER		(1 << 7)
39 #define SSPA_AUD_PLL_CTRL0_ICP_2UA		(0 << 5)
40 #define SSPA_AUD_PLL_CTRL0_ICP_5UA		(1 << 5)
41 #define SSPA_AUD_PLL_CTRL0_ICP_7UA		(2 << 5)
42 #define SSPA_AUD_PLL_CTRL0_ICP_10UA		(3 << 5)
43 #define SSPA_AUD_PLL_CTRL0_DIV_FBCCLK_MASK	(0x3 << 3)
44 #define SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(x)	((x) << 3)
45 #define SSPA_AUD_PLL_CTRL0_DIV_MCLK_MASK	(0x1 << 2)
46 #define SSPA_AUD_PLL_CTRL0_DIV_MCLK(x)		((x) << 2)
47 #define SSPA_AUD_PLL_CTRL0_PD_OVPROT_DIS	(1 << 1)
48 #define SSPA_AUD_PLL_CTRL0_PU			(1 << 0)
49 
50 /* SSPA Audio PLL Control 1 Register */
51 #define SSPA_AUD_PLL_CTRL1_SEL_FAST_CLK		(1 << 24)
52 #define SSPA_AUD_PLL_CTRL1_CLK_SEL_MASK		(1 << 11)
53 #define SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL	(1 << 11)
54 #define SSPA_AUD_PLL_CTRL1_CLK_SEL_VCXO		(0 << 11)
55 #define SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN_MASK (0x7ff << 0)
56 #define SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(x)	((x) << 0)
57 
58 #define CLK_AUDIO_NR_CLKS			3
59 
60 struct mmp2_audio_clk {
61 	void __iomem *mmio_base;
62 
63 	struct clk_hw audio_pll_hw;
64 	struct clk_mux sspa_mux;
65 	struct clk_mux sspa1_mux;
66 	struct clk_divider sysclk_div;
67 	struct clk_divider sspa0_div;
68 	struct clk_divider sspa1_div;
69 	struct clk_gate sysclk_gate;
70 	struct clk_gate sspa0_gate;
71 	struct clk_gate sspa1_gate;
72 
73 	u32 aud_ctrl;
74 	u32 aud_pll_ctrl0;
75 	u32 aud_pll_ctrl1;
76 
77 	spinlock_t lock;
78 
79 	/* Must be last */
80 	struct clk_hw_onecell_data clk_data;
81 };
82 
83 static const struct {
84 	unsigned long parent_rate;
85 	unsigned long freq_vco;
86 	unsigned char mclk;
87 	unsigned char fbcclk;
88 	unsigned short fract;
89 } predivs[] = {
90 	{ 26000000, 135475200, 0, 0, 0x8a18 },
91 	{ 26000000, 147456000, 0, 1, 0x0da1 },
92 	{ 38400000, 135475200, 1, 2, 0x8208 },
93 	{ 38400000, 147456000, 1, 3, 0xaaaa },
94 };
95 
96 static const struct {
97 	unsigned char divisor;
98 	unsigned char modulo;
99 	unsigned char pattern;
100 } postdivs[] = {
101 	{   1,	3,  0, },
102 	{   2,	5,  0, },
103 	{   4,	0,  0, },
104 	{   6,	1,  1, },
105 	{   8,	1,  0, },
106 	{   9,	1,  2, },
107 	{  12,	2,  1, },
108 	{  16,	2,  0, },
109 	{  18,	2,  2, },
110 	{  24,	4,  1, },
111 	{  36,	4,  2, },
112 	{  48,	6,  1, },
113 	{  72,	6,  2, },
114 };
115 
audio_pll_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)116 static unsigned long audio_pll_recalc_rate(struct clk_hw *hw,
117 					   unsigned long parent_rate)
118 {
119 	struct mmp2_audio_clk *priv = container_of(hw, struct mmp2_audio_clk, audio_pll_hw);
120 	unsigned int prediv;
121 	unsigned int postdiv;
122 	u32 aud_pll_ctrl0;
123 	u32 aud_pll_ctrl1;
124 
125 	aud_pll_ctrl0 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL0);
126 	aud_pll_ctrl0 &= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO_MASK |
127 			 SSPA_AUD_PLL_CTRL0_FRACT_MASK |
128 			 SSPA_AUD_PLL_CTRL0_ENA_DITHER |
129 			 SSPA_AUD_PLL_CTRL0_DIV_FBCCLK_MASK |
130 			 SSPA_AUD_PLL_CTRL0_DIV_MCLK_MASK |
131 			 SSPA_AUD_PLL_CTRL0_PU;
132 
133 	aud_pll_ctrl1 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL1);
134 	aud_pll_ctrl1 &= SSPA_AUD_PLL_CTRL1_CLK_SEL_MASK |
135 			 SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN_MASK;
136 
137 	for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
138 		if (predivs[prediv].parent_rate != parent_rate)
139 			continue;
140 		for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
141 			unsigned long freq;
142 			u32 val;
143 
144 			val = SSPA_AUD_PLL_CTRL0_ENA_DITHER;
145 			val |= SSPA_AUD_PLL_CTRL0_PU;
146 			val |= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(postdivs[postdiv].modulo);
147 			val |= SSPA_AUD_PLL_CTRL0_FRACT(predivs[prediv].fract);
148 			val |= SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(predivs[prediv].fbcclk);
149 			val |= SSPA_AUD_PLL_CTRL0_DIV_MCLK(predivs[prediv].mclk);
150 			if (val != aud_pll_ctrl0)
151 				continue;
152 
153 			val = SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL;
154 			val |= SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(postdivs[postdiv].pattern);
155 			if (val != aud_pll_ctrl1)
156 				continue;
157 
158 			freq = predivs[prediv].freq_vco;
159 			freq /= postdivs[postdiv].divisor;
160 			return freq;
161 		}
162 	}
163 
164 	return 0;
165 }
166 
audio_pll_determine_rate(struct clk_hw * hw,struct clk_rate_request * req)167 static int audio_pll_determine_rate(struct clk_hw *hw,
168 				    struct clk_rate_request *req)
169 {
170 	unsigned int prediv;
171 	unsigned int postdiv;
172 	long rounded = 0;
173 
174 	for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
175 		if (predivs[prediv].parent_rate != req->best_parent_rate)
176 			continue;
177 		for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
178 			long freq = predivs[prediv].freq_vco;
179 
180 			freq /= postdivs[postdiv].divisor;
181 			if (freq == req->rate)
182 				return 0;
183 			if (freq < req->rate)
184 				continue;
185 			if (rounded && freq > rounded)
186 				continue;
187 			rounded = freq;
188 		}
189 	}
190 
191 	req->rate = rounded;
192 
193 	return 0;
194 }
195 
audio_pll_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)196 static int audio_pll_set_rate(struct clk_hw *hw, unsigned long rate,
197 			      unsigned long parent_rate)
198 {
199 	struct mmp2_audio_clk *priv = container_of(hw, struct mmp2_audio_clk, audio_pll_hw);
200 	unsigned int prediv;
201 	unsigned int postdiv;
202 	unsigned long val;
203 
204 	for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
205 		if (predivs[prediv].parent_rate != parent_rate)
206 			continue;
207 
208 		for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
209 			if (rate * postdivs[postdiv].divisor != predivs[prediv].freq_vco)
210 				continue;
211 
212 			val = SSPA_AUD_PLL_CTRL0_ENA_DITHER;
213 			val |= SSPA_AUD_PLL_CTRL0_PU;
214 			val |= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(postdivs[postdiv].modulo);
215 			val |= SSPA_AUD_PLL_CTRL0_FRACT(predivs[prediv].fract);
216 			val |= SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(predivs[prediv].fbcclk);
217 			val |= SSPA_AUD_PLL_CTRL0_DIV_MCLK(predivs[prediv].mclk);
218 			writel(val, priv->mmio_base + SSPA_AUD_PLL_CTRL0);
219 
220 			val = SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL;
221 			val |= SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(postdivs[postdiv].pattern);
222 			writel(val, priv->mmio_base + SSPA_AUD_PLL_CTRL1);
223 
224 			return 0;
225 		}
226 	}
227 
228 	return -ERANGE;
229 }
230 
231 static const struct clk_ops audio_pll_ops = {
232 	.recalc_rate = audio_pll_recalc_rate,
233 	.determine_rate = audio_pll_determine_rate,
234 	.set_rate = audio_pll_set_rate,
235 };
236 
register_clocks(struct mmp2_audio_clk * priv,struct device * dev)237 static int register_clocks(struct mmp2_audio_clk *priv, struct device *dev)
238 {
239 	const struct clk_parent_data sspa_mux_parents[] = {
240 		{ .hw = &priv->audio_pll_hw },
241 		{ .fw_name = "i2s0" },
242 	};
243 	const struct clk_parent_data sspa1_mux_parents[] = {
244 		{ .hw = &priv->audio_pll_hw },
245 		{ .fw_name = "i2s1" },
246 	};
247 	int ret;
248 
249 	priv->audio_pll_hw.init = CLK_HW_INIT_FW_NAME("audio_pll",
250 				"vctcxo", &audio_pll_ops,
251 				CLK_SET_RATE_PARENT);
252 	ret = devm_clk_hw_register(dev, &priv->audio_pll_hw);
253 	if (ret)
254 		return ret;
255 
256 	priv->sspa_mux.hw.init = CLK_HW_INIT_PARENTS_DATA("sspa_mux",
257 				sspa_mux_parents, &clk_mux_ops,
258 				CLK_SET_RATE_PARENT);
259 	priv->sspa_mux.reg = priv->mmio_base + SSPA_AUD_CTRL;
260 	priv->sspa_mux.mask = 1;
261 	priv->sspa_mux.shift = SSPA_AUD_CTRL_SSPA0_MUX_SHIFT;
262 	ret = devm_clk_hw_register(dev, &priv->sspa_mux.hw);
263 	if (ret)
264 		return ret;
265 
266 	priv->sysclk_div.hw.init = CLK_HW_INIT_HW("sys_div",
267 				&priv->sspa_mux.hw, &clk_divider_ops,
268 				CLK_SET_RATE_PARENT);
269 	priv->sysclk_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
270 	priv->sysclk_div.shift = SSPA_AUD_CTRL_SYSCLK_DIV_SHIFT;
271 	priv->sysclk_div.width = 6;
272 	priv->sysclk_div.flags = CLK_DIVIDER_ONE_BASED;
273 	priv->sysclk_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
274 	priv->sysclk_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
275 	ret = devm_clk_hw_register(dev, &priv->sysclk_div.hw);
276 	if (ret)
277 		return ret;
278 
279 	priv->sysclk_gate.hw.init = CLK_HW_INIT_HW("sys_clk",
280 				&priv->sysclk_div.hw, &clk_gate_ops,
281 				CLK_SET_RATE_PARENT);
282 	priv->sysclk_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
283 	priv->sysclk_gate.bit_idx = SSPA_AUD_CTRL_SYSCLK_SHIFT;
284 	ret = devm_clk_hw_register(dev, &priv->sysclk_gate.hw);
285 	if (ret)
286 		return ret;
287 
288 	priv->sspa0_div.hw.init = CLK_HW_INIT_HW("sspa0_div",
289 				&priv->sspa_mux.hw, &clk_divider_ops, 0);
290 	priv->sspa0_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
291 	priv->sspa0_div.shift = SSPA_AUD_CTRL_SSPA0_DIV_SHIFT;
292 	priv->sspa0_div.width = 6;
293 	priv->sspa0_div.flags = CLK_DIVIDER_ONE_BASED;
294 	priv->sspa0_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
295 	priv->sspa0_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
296 	ret = devm_clk_hw_register(dev, &priv->sspa0_div.hw);
297 	if (ret)
298 		return ret;
299 
300 	priv->sspa0_gate.hw.init = CLK_HW_INIT_HW("sspa0_clk",
301 				&priv->sspa0_div.hw, &clk_gate_ops,
302 				CLK_SET_RATE_PARENT);
303 	priv->sspa0_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
304 	priv->sspa0_gate.bit_idx = SSPA_AUD_CTRL_SSPA0_SHIFT;
305 	ret = devm_clk_hw_register(dev, &priv->sspa0_gate.hw);
306 	if (ret)
307 		return ret;
308 
309 	priv->sspa1_mux.hw.init = CLK_HW_INIT_PARENTS_DATA("sspa1_mux",
310 				sspa1_mux_parents, &clk_mux_ops,
311 				CLK_SET_RATE_PARENT);
312 	priv->sspa1_mux.reg = priv->mmio_base + SSPA_AUD_CTRL;
313 	priv->sspa1_mux.mask = 1;
314 	priv->sspa1_mux.shift = SSPA_AUD_CTRL_SSPA1_MUX_SHIFT;
315 	ret = devm_clk_hw_register(dev, &priv->sspa1_mux.hw);
316 	if (ret)
317 		return ret;
318 
319 	priv->sspa1_div.hw.init = CLK_HW_INIT_HW("sspa1_div",
320 				&priv->sspa1_mux.hw, &clk_divider_ops, 0);
321 	priv->sspa1_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
322 	priv->sspa1_div.shift = SSPA_AUD_CTRL_SSPA1_DIV_SHIFT;
323 	priv->sspa1_div.width = 6;
324 	priv->sspa1_div.flags = CLK_DIVIDER_ONE_BASED;
325 	priv->sspa1_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
326 	priv->sspa1_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
327 	ret = devm_clk_hw_register(dev, &priv->sspa1_div.hw);
328 	if (ret)
329 		return ret;
330 
331 	priv->sspa1_gate.hw.init = CLK_HW_INIT_HW("sspa1_clk",
332 				&priv->sspa1_div.hw, &clk_gate_ops,
333 				CLK_SET_RATE_PARENT);
334 	priv->sspa1_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
335 	priv->sspa1_gate.bit_idx = SSPA_AUD_CTRL_SSPA1_SHIFT;
336 	ret = devm_clk_hw_register(dev, &priv->sspa1_gate.hw);
337 	if (ret)
338 		return ret;
339 
340 	priv->clk_data.hws[MMP2_CLK_AUDIO_SYSCLK] = &priv->sysclk_gate.hw;
341 	priv->clk_data.hws[MMP2_CLK_AUDIO_SSPA0] = &priv->sspa0_gate.hw;
342 	priv->clk_data.hws[MMP2_CLK_AUDIO_SSPA1] = &priv->sspa1_gate.hw;
343 	priv->clk_data.num = CLK_AUDIO_NR_CLKS;
344 
345 	return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
346 				      &priv->clk_data);
347 }
348 
mmp2_audio_clk_probe(struct platform_device * pdev)349 static int mmp2_audio_clk_probe(struct platform_device *pdev)
350 {
351 	struct mmp2_audio_clk *priv;
352 	int ret;
353 
354 	priv = devm_kzalloc(&pdev->dev,
355 			    struct_size(priv, clk_data.hws,
356 					CLK_AUDIO_NR_CLKS),
357 			    GFP_KERNEL);
358 	if (!priv)
359 		return -ENOMEM;
360 
361 	spin_lock_init(&priv->lock);
362 	platform_set_drvdata(pdev, priv);
363 
364 	priv->mmio_base = devm_platform_ioremap_resource(pdev, 0);
365 	if (IS_ERR(priv->mmio_base))
366 		return PTR_ERR(priv->mmio_base);
367 
368 	pm_runtime_enable(&pdev->dev);
369 	ret = pm_clk_create(&pdev->dev);
370 	if (ret)
371 		goto disable_pm_runtime;
372 
373 	ret = pm_clk_add(&pdev->dev, "audio");
374 	if (ret)
375 		goto destroy_pm_clk;
376 
377 	ret = register_clocks(priv, &pdev->dev);
378 	if (ret)
379 		goto destroy_pm_clk;
380 
381 	return 0;
382 
383 destroy_pm_clk:
384 	pm_clk_destroy(&pdev->dev);
385 disable_pm_runtime:
386 	pm_runtime_disable(&pdev->dev);
387 
388 	return ret;
389 }
390 
mmp2_audio_clk_remove(struct platform_device * pdev)391 static void mmp2_audio_clk_remove(struct platform_device *pdev)
392 {
393 	pm_clk_destroy(&pdev->dev);
394 	pm_runtime_disable(&pdev->dev);
395 }
396 
397 #ifdef CONFIG_PM
mmp2_audio_clk_suspend(struct device * dev)398 static int mmp2_audio_clk_suspend(struct device *dev)
399 {
400 	struct mmp2_audio_clk *priv = dev_get_drvdata(dev);
401 
402 	priv->aud_ctrl = readl(priv->mmio_base + SSPA_AUD_CTRL);
403 	priv->aud_pll_ctrl0 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL0);
404 	priv->aud_pll_ctrl1 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL1);
405 	pm_clk_suspend(dev);
406 
407 	return 0;
408 }
409 
mmp2_audio_clk_resume(struct device * dev)410 static int mmp2_audio_clk_resume(struct device *dev)
411 {
412 	struct mmp2_audio_clk *priv = dev_get_drvdata(dev);
413 
414 	pm_clk_resume(dev);
415 	writel(priv->aud_ctrl, priv->mmio_base + SSPA_AUD_CTRL);
416 	writel(priv->aud_pll_ctrl0, priv->mmio_base + SSPA_AUD_PLL_CTRL0);
417 	writel(priv->aud_pll_ctrl1, priv->mmio_base + SSPA_AUD_PLL_CTRL1);
418 
419 	return 0;
420 }
421 #endif
422 
423 static const struct dev_pm_ops mmp2_audio_clk_pm_ops = {
424 	SET_RUNTIME_PM_OPS(mmp2_audio_clk_suspend, mmp2_audio_clk_resume, NULL)
425 };
426 
427 static const struct of_device_id mmp2_audio_clk_of_match[] = {
428 	{ .compatible = "marvell,mmp2-audio-clock" },
429 	{}
430 };
431 
432 MODULE_DEVICE_TABLE(of, mmp2_audio_clk_of_match);
433 
434 static struct platform_driver mmp2_audio_clk_driver = {
435 	.driver = {
436 		.name = "mmp2-audio-clock",
437 		.of_match_table = of_match_ptr(mmp2_audio_clk_of_match),
438 		.pm = &mmp2_audio_clk_pm_ops,
439 	},
440 	.probe = mmp2_audio_clk_probe,
441 	.remove = mmp2_audio_clk_remove,
442 };
443 module_platform_driver(mmp2_audio_clk_driver);
444 
445 MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
446 MODULE_DESCRIPTION("Clock driver for MMP2 Audio subsystem");
447 MODULE_LICENSE("GPL");
448