1 // SPDX-License-Identifier: GPL-2.0+
2 // Copyright 2018-2021 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/rpmsg.h>
13 #include <linux/slab.h>
14 #include <sound/core.h>
15 #include <sound/dmaengine_pcm.h>
16 #include <sound/pcm_params.h>
17
18 #include "fsl_rpmsg.h"
19 #include "imx-pcm.h"
20
21 #define FSL_RPMSG_RATES (SNDRV_PCM_RATE_8000 | \
22 SNDRV_PCM_RATE_16000 | \
23 SNDRV_PCM_RATE_48000)
24 #define FSL_RPMSG_FORMATS SNDRV_PCM_FMTBIT_S16_LE
25
26 /* 192kHz/32bit/2ch/60s size is 0x574e00 */
27 #define LPA_LARGE_BUFFER_SIZE (0x6000000)
28
29 static const unsigned int fsl_rpmsg_rates[] = {
30 8000, 11025, 16000, 22050, 44100,
31 32000, 48000, 96000, 88200, 176400, 192000,
32 352800, 384000, 705600, 768000, 1411200, 2822400,
33 };
34
35 static const struct snd_pcm_hw_constraint_list fsl_rpmsg_rate_constraints = {
36 .count = ARRAY_SIZE(fsl_rpmsg_rates),
37 .list = fsl_rpmsg_rates,
38 };
39
fsl_rpmsg_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)40 static int fsl_rpmsg_hw_params(struct snd_pcm_substream *substream,
41 struct snd_pcm_hw_params *params,
42 struct snd_soc_dai *dai)
43 {
44 struct fsl_rpmsg *rpmsg = snd_soc_dai_get_drvdata(dai);
45 struct clk *p = rpmsg->mclk, *pll = NULL, *npll = NULL;
46 u64 rate = params_rate(params);
47 int ret = 0;
48
49 /* Get current pll parent */
50 while (p && rpmsg->pll8k && rpmsg->pll11k) {
51 struct clk *pp = clk_get_parent(p);
52
53 if (clk_is_match(pp, rpmsg->pll8k) ||
54 clk_is_match(pp, rpmsg->pll11k)) {
55 pll = pp;
56 break;
57 }
58 p = pp;
59 }
60
61 /* Switch to another pll parent if needed. */
62 if (pll) {
63 npll = (do_div(rate, 8000) ? rpmsg->pll11k : rpmsg->pll8k);
64 if (!clk_is_match(pll, npll)) {
65 ret = clk_set_parent(p, npll);
66 if (ret < 0)
67 dev_warn(dai->dev, "failed to set parent %s: %d\n",
68 __clk_get_name(npll), ret);
69 }
70 }
71
72 if (!(rpmsg->mclk_streams & BIT(substream->stream))) {
73 ret = clk_prepare_enable(rpmsg->mclk);
74 if (ret) {
75 dev_err(dai->dev, "failed to enable mclk: %d\n", ret);
76 return ret;
77 }
78
79 rpmsg->mclk_streams |= BIT(substream->stream);
80 }
81
82 return ret;
83 }
84
fsl_rpmsg_hw_free(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)85 static int fsl_rpmsg_hw_free(struct snd_pcm_substream *substream,
86 struct snd_soc_dai *dai)
87 {
88 struct fsl_rpmsg *rpmsg = snd_soc_dai_get_drvdata(dai);
89
90 if (rpmsg->mclk_streams & BIT(substream->stream)) {
91 clk_disable_unprepare(rpmsg->mclk);
92 rpmsg->mclk_streams &= ~BIT(substream->stream);
93 }
94
95 return 0;
96 }
97
fsl_rpmsg_startup(struct snd_pcm_substream * substream,struct snd_soc_dai * cpu_dai)98 static int fsl_rpmsg_startup(struct snd_pcm_substream *substream,
99 struct snd_soc_dai *cpu_dai)
100 {
101 int ret;
102
103 ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
104 SNDRV_PCM_HW_PARAM_RATE,
105 &fsl_rpmsg_rate_constraints);
106
107 return ret;
108 }
109
110 static const struct snd_soc_dai_ops fsl_rpmsg_dai_ops = {
111 .startup = fsl_rpmsg_startup,
112 .hw_params = fsl_rpmsg_hw_params,
113 .hw_free = fsl_rpmsg_hw_free,
114 };
115
116 static struct snd_soc_dai_driver fsl_rpmsg_dai = {
117 .playback = {
118 .stream_name = "CPU-Playback",
119 .channels_min = 2,
120 .channels_max = 2,
121 .rates = SNDRV_PCM_RATE_KNOT,
122 .formats = FSL_RPMSG_FORMATS,
123 },
124 .capture = {
125 .stream_name = "CPU-Capture",
126 .channels_min = 2,
127 .channels_max = 2,
128 .rates = SNDRV_PCM_RATE_KNOT,
129 .formats = FSL_RPMSG_FORMATS,
130 },
131 .symmetric_rate = 1,
132 .symmetric_channels = 1,
133 .symmetric_sample_bits = 1,
134 .ops = &fsl_rpmsg_dai_ops,
135 };
136
137 static const struct snd_soc_component_driver fsl_component = {
138 .name = "fsl-rpmsg",
139 };
140
141 static const struct fsl_rpmsg_soc_data imx7ulp_data = {
142 .rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
143 SNDRV_PCM_RATE_48000,
144 .formats = SNDRV_PCM_FMTBIT_S16_LE,
145 };
146
147 static const struct fsl_rpmsg_soc_data imx8mm_data = {
148 .rates = SNDRV_PCM_RATE_KNOT,
149 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE |
150 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_DSD_U8 |
151 SNDRV_PCM_FMTBIT_DSD_U16_LE | SNDRV_PCM_FMTBIT_DSD_U32_LE,
152 };
153
154 static const struct fsl_rpmsg_soc_data imx8mn_data = {
155 .rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
156 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
157 SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
158 SNDRV_PCM_RATE_192000,
159 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE |
160 SNDRV_PCM_FMTBIT_S32_LE,
161 };
162
163 static const struct fsl_rpmsg_soc_data imx8mp_data = {
164 .rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
165 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
166 SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
167 SNDRV_PCM_RATE_192000,
168 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE |
169 SNDRV_PCM_FMTBIT_S32_LE,
170 };
171
172 static const struct of_device_id fsl_rpmsg_ids[] = {
173 { .compatible = "fsl,imx7ulp-rpmsg-audio", .data = &imx7ulp_data},
174 { .compatible = "fsl,imx8mm-rpmsg-audio", .data = &imx8mm_data},
175 { .compatible = "fsl,imx8mn-rpmsg-audio", .data = &imx8mn_data},
176 { .compatible = "fsl,imx8mp-rpmsg-audio", .data = &imx8mp_data},
177 { .compatible = "fsl,imx8ulp-rpmsg-audio", .data = &imx7ulp_data},
178 { /* sentinel */ }
179 };
180 MODULE_DEVICE_TABLE(of, fsl_rpmsg_ids);
181
fsl_rpmsg_probe(struct platform_device * pdev)182 static int fsl_rpmsg_probe(struct platform_device *pdev)
183 {
184 struct device_node *np = pdev->dev.of_node;
185 struct fsl_rpmsg *rpmsg;
186 int ret;
187
188 rpmsg = devm_kzalloc(&pdev->dev, sizeof(struct fsl_rpmsg), GFP_KERNEL);
189 if (!rpmsg)
190 return -ENOMEM;
191
192 rpmsg->soc_data = of_device_get_match_data(&pdev->dev);
193
194 fsl_rpmsg_dai.playback.rates = rpmsg->soc_data->rates;
195 fsl_rpmsg_dai.capture.rates = rpmsg->soc_data->rates;
196 fsl_rpmsg_dai.playback.formats = rpmsg->soc_data->formats;
197 fsl_rpmsg_dai.capture.formats = rpmsg->soc_data->formats;
198
199 if (of_property_read_bool(np, "fsl,enable-lpa")) {
200 rpmsg->enable_lpa = 1;
201 rpmsg->buffer_size = LPA_LARGE_BUFFER_SIZE;
202 } else {
203 rpmsg->buffer_size = IMX_DEFAULT_DMABUF_SIZE;
204 }
205
206 /* Get the optional clocks */
207 rpmsg->ipg = devm_clk_get_optional(&pdev->dev, "ipg");
208 if (IS_ERR(rpmsg->ipg))
209 return PTR_ERR(rpmsg->ipg);
210
211 rpmsg->mclk = devm_clk_get_optional(&pdev->dev, "mclk");
212 if (IS_ERR(rpmsg->mclk))
213 return PTR_ERR(rpmsg->mclk);
214
215 rpmsg->dma = devm_clk_get_optional(&pdev->dev, "dma");
216 if (IS_ERR(rpmsg->dma))
217 return PTR_ERR(rpmsg->dma);
218
219 rpmsg->pll8k = devm_clk_get_optional(&pdev->dev, "pll8k");
220 if (IS_ERR(rpmsg->pll8k))
221 return PTR_ERR(rpmsg->pll8k);
222
223 rpmsg->pll11k = devm_clk_get_optional(&pdev->dev, "pll11k");
224 if (IS_ERR(rpmsg->pll11k))
225 return PTR_ERR(rpmsg->pll11k);
226
227 platform_set_drvdata(pdev, rpmsg);
228 pm_runtime_enable(&pdev->dev);
229
230 ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
231 &fsl_rpmsg_dai, 1);
232 if (ret)
233 return ret;
234
235 rpmsg->card_pdev = platform_device_register_data(&pdev->dev,
236 "imx-audio-rpmsg",
237 PLATFORM_DEVID_NONE,
238 NULL,
239 0);
240 if (IS_ERR(rpmsg->card_pdev)) {
241 dev_err(&pdev->dev, "failed to register rpmsg card\n");
242 ret = PTR_ERR(rpmsg->card_pdev);
243 return ret;
244 }
245
246 return 0;
247 }
248
fsl_rpmsg_remove(struct platform_device * pdev)249 static int fsl_rpmsg_remove(struct platform_device *pdev)
250 {
251 struct fsl_rpmsg *rpmsg = platform_get_drvdata(pdev);
252
253 if (rpmsg->card_pdev)
254 platform_device_unregister(rpmsg->card_pdev);
255
256 return 0;
257 }
258
259 #ifdef CONFIG_PM
fsl_rpmsg_runtime_resume(struct device * dev)260 static int fsl_rpmsg_runtime_resume(struct device *dev)
261 {
262 struct fsl_rpmsg *rpmsg = dev_get_drvdata(dev);
263 int ret;
264
265 ret = clk_prepare_enable(rpmsg->ipg);
266 if (ret) {
267 dev_err(dev, "failed to enable ipg clock: %d\n", ret);
268 goto ipg_err;
269 }
270
271 ret = clk_prepare_enable(rpmsg->dma);
272 if (ret) {
273 dev_err(dev, "Failed to enable dma clock %d\n", ret);
274 goto dma_err;
275 }
276
277 return 0;
278
279 dma_err:
280 clk_disable_unprepare(rpmsg->ipg);
281 ipg_err:
282 return ret;
283 }
284
fsl_rpmsg_runtime_suspend(struct device * dev)285 static int fsl_rpmsg_runtime_suspend(struct device *dev)
286 {
287 struct fsl_rpmsg *rpmsg = dev_get_drvdata(dev);
288
289 clk_disable_unprepare(rpmsg->dma);
290 clk_disable_unprepare(rpmsg->ipg);
291
292 return 0;
293 }
294 #endif
295
296 static const struct dev_pm_ops fsl_rpmsg_pm_ops = {
297 SET_RUNTIME_PM_OPS(fsl_rpmsg_runtime_suspend,
298 fsl_rpmsg_runtime_resume,
299 NULL)
300 };
301
302 static struct platform_driver fsl_rpmsg_driver = {
303 .probe = fsl_rpmsg_probe,
304 .remove = fsl_rpmsg_remove,
305 .driver = {
306 .name = "fsl_rpmsg",
307 .pm = &fsl_rpmsg_pm_ops,
308 .of_match_table = fsl_rpmsg_ids,
309 },
310 };
311 module_platform_driver(fsl_rpmsg_driver);
312
313 MODULE_DESCRIPTION("Freescale SoC Audio PRMSG CPU Interface");
314 MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
315 MODULE_ALIAS("platform:fsl_rpmsg");
316 MODULE_LICENSE("GPL");
317