xref: /openbmc/linux/sound/soc/fsl/fsl_aud2htx.c (revision 8dd3cdea)
1 // SPDX-License-Identifier: GPL-2.0+
2 // Copyright 2020 NXP
3 
4 #include <linux/clk.h>
5 #include <linux/clk-provider.h>
6 #include <linux/delay.h>
7 #include <linux/dmaengine.h>
8 #include <linux/module.h>
9 #include <linux/of_device.h>
10 #include <linux/of_address.h>
11 #include <linux/pm_runtime.h>
12 #include <linux/regmap.h>
13 #include <linux/slab.h>
14 #include <linux/time.h>
15 #include <linux/pm_qos.h>
16 #include <sound/core.h>
17 #include <sound/dmaengine_pcm.h>
18 #include <sound/pcm_params.h>
19 #include <linux/dma-mapping.h>
20 
21 #include "fsl_aud2htx.h"
22 #include "imx-pcm.h"
23 
24 static int fsl_aud2htx_trigger(struct snd_pcm_substream *substream, int cmd,
25 			       struct snd_soc_dai *dai)
26 {
27 	struct fsl_aud2htx *aud2htx = snd_soc_dai_get_drvdata(dai);
28 
29 	switch (cmd) {
30 	case SNDRV_PCM_TRIGGER_START:
31 	case SNDRV_PCM_TRIGGER_RESUME:
32 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
33 		regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL,
34 				   AUD2HTX_CTRL_EN, AUD2HTX_CTRL_EN);
35 		regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
36 				   AUD2HTX_CTRE_DE, AUD2HTX_CTRE_DE);
37 		break;
38 	case SNDRV_PCM_TRIGGER_SUSPEND:
39 	case SNDRV_PCM_TRIGGER_STOP:
40 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
41 		regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
42 				   AUD2HTX_CTRE_DE, 0);
43 		regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL,
44 				   AUD2HTX_CTRL_EN, 0);
45 		break;
46 	default:
47 		return -EINVAL;
48 	}
49 	return 0;
50 }
51 
52 static const struct snd_soc_dai_ops fsl_aud2htx_dai_ops = {
53 	.trigger	= fsl_aud2htx_trigger,
54 };
55 
56 static int fsl_aud2htx_dai_probe(struct snd_soc_dai *cpu_dai)
57 {
58 	struct fsl_aud2htx *aud2htx = dev_get_drvdata(cpu_dai->dev);
59 
60 	/* DMA request when number of entries < WTMK_LOW */
61 	regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
62 			   AUD2HTX_CTRE_DT_MASK, 0);
63 
64 	/* Disable interrupts*/
65 	regmap_update_bits(aud2htx->regmap, AUD2HTX_IRQ_MASK,
66 			   AUD2HTX_WM_HIGH_IRQ_MASK |
67 			   AUD2HTX_WM_LOW_IRQ_MASK |
68 			   AUD2HTX_OVF_MASK,
69 			   AUD2HTX_WM_HIGH_IRQ_MASK |
70 			   AUD2HTX_WM_LOW_IRQ_MASK |
71 			   AUD2HTX_OVF_MASK);
72 
73 	/* Configure watermark */
74 	regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
75 			   AUD2HTX_CTRE_WL_MASK,
76 			   AUD2HTX_WTMK_LOW << AUD2HTX_CTRE_WL_SHIFT);
77 	regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
78 			   AUD2HTX_CTRE_WH_MASK,
79 			   AUD2HTX_WTMK_HIGH << AUD2HTX_CTRE_WH_SHIFT);
80 
81 	snd_soc_dai_init_dma_data(cpu_dai, &aud2htx->dma_params_tx,
82 				  &aud2htx->dma_params_rx);
83 
84 	return 0;
85 }
86 
87 static struct snd_soc_dai_driver fsl_aud2htx_dai = {
88 	.probe = fsl_aud2htx_dai_probe,
89 	.playback = {
90 		.stream_name = "CPU-Playback",
91 		.channels_min = 1,
92 		.channels_max = 8,
93 		.rates = SNDRV_PCM_RATE_32000 |
94 			 SNDRV_PCM_RATE_44100 |
95 			 SNDRV_PCM_RATE_48000 |
96 			 SNDRV_PCM_RATE_88200 |
97 			 SNDRV_PCM_RATE_96000 |
98 			 SNDRV_PCM_RATE_176400 |
99 			 SNDRV_PCM_RATE_192000,
100 		.formats = FSL_AUD2HTX_FORMATS,
101 	},
102 	.ops = &fsl_aud2htx_dai_ops,
103 };
104 
105 static const struct snd_soc_component_driver fsl_aud2htx_component = {
106 	.name	= "fsl-aud2htx",
107 };
108 
109 static const struct reg_default fsl_aud2htx_reg_defaults[] = {
110 	{AUD2HTX_CTRL,		0x00000000},
111 	{AUD2HTX_CTRL_EXT,	0x00000000},
112 	{AUD2HTX_WR,		0x00000000},
113 	{AUD2HTX_STATUS,	0x00000000},
114 	{AUD2HTX_IRQ_NOMASK,	0x00000000},
115 	{AUD2HTX_IRQ_MASKED,	0x00000000},
116 	{AUD2HTX_IRQ_MASK,	0x00000000},
117 };
118 
119 static bool fsl_aud2htx_readable_reg(struct device *dev, unsigned int reg)
120 {
121 	switch (reg) {
122 	case AUD2HTX_CTRL:
123 	case AUD2HTX_CTRL_EXT:
124 	case AUD2HTX_STATUS:
125 	case AUD2HTX_IRQ_NOMASK:
126 	case AUD2HTX_IRQ_MASKED:
127 	case AUD2HTX_IRQ_MASK:
128 		return true;
129 	default:
130 		return false;
131 	}
132 }
133 
134 static bool fsl_aud2htx_writeable_reg(struct device *dev, unsigned int reg)
135 {
136 	switch (reg) {
137 	case AUD2HTX_CTRL:
138 	case AUD2HTX_CTRL_EXT:
139 	case AUD2HTX_WR:
140 	case AUD2HTX_IRQ_NOMASK:
141 	case AUD2HTX_IRQ_MASKED:
142 	case AUD2HTX_IRQ_MASK:
143 		return true;
144 	default:
145 		return false;
146 	}
147 }
148 
149 static bool fsl_aud2htx_volatile_reg(struct device *dev, unsigned int reg)
150 {
151 	switch (reg) {
152 	case AUD2HTX_STATUS:
153 	case AUD2HTX_IRQ_NOMASK:
154 	case AUD2HTX_IRQ_MASKED:
155 		return true;
156 	default:
157 		return false;
158 	}
159 }
160 
161 static const struct regmap_config fsl_aud2htx_regmap_config = {
162 	.reg_bits = 32,
163 	.reg_stride = 4,
164 	.val_bits = 32,
165 
166 	.max_register = AUD2HTX_IRQ_MASK,
167 	.reg_defaults = fsl_aud2htx_reg_defaults,
168 	.num_reg_defaults = ARRAY_SIZE(fsl_aud2htx_reg_defaults),
169 	.readable_reg = fsl_aud2htx_readable_reg,
170 	.volatile_reg = fsl_aud2htx_volatile_reg,
171 	.writeable_reg = fsl_aud2htx_writeable_reg,
172 	.cache_type = REGCACHE_RBTREE,
173 };
174 
175 static const struct of_device_id fsl_aud2htx_dt_ids[] = {
176 	{ .compatible = "fsl,imx8mp-aud2htx",},
177 	{}
178 };
179 MODULE_DEVICE_TABLE(of, fsl_aud2htx_dt_ids);
180 
181 static irqreturn_t fsl_aud2htx_isr(int irq, void *dev_id)
182 {
183 	return IRQ_HANDLED;
184 }
185 
186 static int fsl_aud2htx_probe(struct platform_device *pdev)
187 {
188 	struct fsl_aud2htx *aud2htx;
189 	struct resource *res;
190 	void __iomem *regs;
191 	int ret, irq;
192 
193 	aud2htx = devm_kzalloc(&pdev->dev, sizeof(*aud2htx), GFP_KERNEL);
194 	if (!aud2htx)
195 		return -ENOMEM;
196 
197 	aud2htx->pdev = pdev;
198 
199 	regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
200 	if (IS_ERR(regs))
201 		return PTR_ERR(regs);
202 
203 	aud2htx->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
204 						&fsl_aud2htx_regmap_config);
205 	if (IS_ERR(aud2htx->regmap)) {
206 		dev_err(&pdev->dev, "failed to init regmap");
207 		return PTR_ERR(aud2htx->regmap);
208 	}
209 
210 	irq = platform_get_irq(pdev, 0);
211 	if (irq < 0)
212 		return irq;
213 
214 	ret = devm_request_irq(&pdev->dev, irq, fsl_aud2htx_isr, 0,
215 			       dev_name(&pdev->dev), aud2htx);
216 	if (ret) {
217 		dev_err(&pdev->dev, "failed to claim irq %u: %d\n", irq, ret);
218 		return ret;
219 	}
220 
221 	aud2htx->bus_clk = devm_clk_get(&pdev->dev, "bus");
222 	if (IS_ERR(aud2htx->bus_clk)) {
223 		dev_err(&pdev->dev, "failed to get mem clock\n");
224 		return PTR_ERR(aud2htx->bus_clk);
225 	}
226 
227 	aud2htx->dma_params_tx.chan_name = "tx";
228 	aud2htx->dma_params_tx.maxburst = AUD2HTX_MAXBURST;
229 	aud2htx->dma_params_tx.addr = res->start + AUD2HTX_WR;
230 
231 	platform_set_drvdata(pdev, aud2htx);
232 	pm_runtime_enable(&pdev->dev);
233 
234 	regcache_cache_only(aud2htx->regmap, true);
235 
236 	ret = devm_snd_soc_register_component(&pdev->dev,
237 					      &fsl_aud2htx_component,
238 					      &fsl_aud2htx_dai, 1);
239 	if (ret) {
240 		dev_err(&pdev->dev, "failed to register ASoC DAI\n");
241 		return ret;
242 	}
243 
244 	ret = imx_pcm_dma_init(pdev);
245 	if (ret)
246 		dev_err(&pdev->dev, "failed to init imx pcm dma: %d\n", ret);
247 
248 	return ret;
249 }
250 
251 static int fsl_aud2htx_remove(struct platform_device *pdev)
252 {
253 	pm_runtime_disable(&pdev->dev);
254 
255 	return 0;
256 }
257 
258 static int __maybe_unused fsl_aud2htx_runtime_suspend(struct device *dev)
259 {
260 	struct fsl_aud2htx *aud2htx = dev_get_drvdata(dev);
261 
262 	regcache_cache_only(aud2htx->regmap, true);
263 	clk_disable_unprepare(aud2htx->bus_clk);
264 
265 	return 0;
266 }
267 
268 static int __maybe_unused fsl_aud2htx_runtime_resume(struct device *dev)
269 {
270 	struct fsl_aud2htx *aud2htx = dev_get_drvdata(dev);
271 	int ret;
272 
273 	ret = clk_prepare_enable(aud2htx->bus_clk);
274 	if (ret)
275 		return ret;
276 
277 	regcache_cache_only(aud2htx->regmap, false);
278 	regcache_mark_dirty(aud2htx->regmap);
279 	regcache_sync(aud2htx->regmap);
280 
281 	return 0;
282 }
283 
284 static const struct dev_pm_ops fsl_aud2htx_pm_ops = {
285 	SET_RUNTIME_PM_OPS(fsl_aud2htx_runtime_suspend,
286 			   fsl_aud2htx_runtime_resume,
287 			   NULL)
288 	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
289 				pm_runtime_force_resume)
290 };
291 
292 static struct platform_driver fsl_aud2htx_driver = {
293 	.probe = fsl_aud2htx_probe,
294 	.remove = fsl_aud2htx_remove,
295 	.driver = {
296 		.name = "fsl-aud2htx",
297 		.pm = &fsl_aud2htx_pm_ops,
298 		.of_match_table = fsl_aud2htx_dt_ids,
299 	},
300 };
301 module_platform_driver(fsl_aud2htx_driver);
302 
303 MODULE_AUTHOR("Shengjiu Wang <Shengjiu.Wang@nxp.com>");
304 MODULE_DESCRIPTION("NXP AUD2HTX driver");
305 MODULE_LICENSE("GPL v2");
306