1
2
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
27#define LPA_LARGE_BUFFER_SIZE (0x6000000)
28
29static 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
35static 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
40static 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
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
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
85static 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
98static 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
110static 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
116static 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
137static const struct snd_soc_component_driver fsl_component = {
138 .name = "fsl-rpmsg",
139};
140
141static const struct of_device_id fsl_rpmsg_ids[] = {
142 { .compatible = "fsl,imx7ulp-rpmsg-audio"},
143 { .compatible = "fsl,imx8mm-rpmsg-audio"},
144 { .compatible = "fsl,imx8mn-rpmsg-audio"},
145 { .compatible = "fsl,imx8mp-rpmsg-audio"},
146 { }
147};
148MODULE_DEVICE_TABLE(of, fsl_rpmsg_ids);
149
150static int fsl_rpmsg_probe(struct platform_device *pdev)
151{
152 struct device_node *np = pdev->dev.of_node;
153 struct fsl_rpmsg *rpmsg;
154 int ret;
155
156 rpmsg = devm_kzalloc(&pdev->dev, sizeof(struct fsl_rpmsg), GFP_KERNEL);
157 if (!rpmsg)
158 return -ENOMEM;
159
160 if (of_property_read_bool(np, "fsl,enable-lpa")) {
161 rpmsg->enable_lpa = 1;
162 rpmsg->buffer_size = LPA_LARGE_BUFFER_SIZE;
163 } else {
164 rpmsg->buffer_size = IMX_DEFAULT_DMABUF_SIZE;
165 }
166
167
168 rpmsg->ipg = devm_clk_get(&pdev->dev, "ipg");
169 if (IS_ERR(rpmsg->ipg))
170 rpmsg->ipg = NULL;
171
172 rpmsg->mclk = devm_clk_get(&pdev->dev, "mclk");
173 if (IS_ERR(rpmsg->mclk))
174 rpmsg->mclk = NULL;
175
176 rpmsg->dma = devm_clk_get(&pdev->dev, "dma");
177 if (IS_ERR(rpmsg->dma))
178 rpmsg->dma = NULL;
179
180 rpmsg->pll8k = devm_clk_get(&pdev->dev, "pll8k");
181 if (IS_ERR(rpmsg->pll8k))
182 rpmsg->pll8k = NULL;
183
184 rpmsg->pll11k = devm_clk_get(&pdev->dev, "pll11k");
185 if (IS_ERR(rpmsg->pll11k))
186 rpmsg->pll11k = NULL;
187
188 platform_set_drvdata(pdev, rpmsg);
189 pm_runtime_enable(&pdev->dev);
190
191 ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
192 &fsl_rpmsg_dai, 1);
193 if (ret)
194 return ret;
195
196 rpmsg->card_pdev = platform_device_register_data(&pdev->dev,
197 "imx-audio-rpmsg",
198 PLATFORM_DEVID_NONE,
199 NULL,
200 0);
201 if (IS_ERR(rpmsg->card_pdev)) {
202 dev_err(&pdev->dev, "failed to register rpmsg card\n");
203 ret = PTR_ERR(rpmsg->card_pdev);
204 return ret;
205 }
206
207 return 0;
208}
209
210static int fsl_rpmsg_remove(struct platform_device *pdev)
211{
212 struct fsl_rpmsg *rpmsg = platform_get_drvdata(pdev);
213
214 if (rpmsg->card_pdev)
215 platform_device_unregister(rpmsg->card_pdev);
216
217 return 0;
218}
219
220#ifdef CONFIG_PM
221static int fsl_rpmsg_runtime_resume(struct device *dev)
222{
223 struct fsl_rpmsg *rpmsg = dev_get_drvdata(dev);
224 int ret;
225
226 ret = clk_prepare_enable(rpmsg->ipg);
227 if (ret) {
228 dev_err(dev, "failed to enable ipg clock: %d\n", ret);
229 goto ipg_err;
230 }
231
232 ret = clk_prepare_enable(rpmsg->dma);
233 if (ret) {
234 dev_err(dev, "Failed to enable dma clock %d\n", ret);
235 goto dma_err;
236 }
237
238 return 0;
239
240dma_err:
241 clk_disable_unprepare(rpmsg->ipg);
242ipg_err:
243 return ret;
244}
245
246static int fsl_rpmsg_runtime_suspend(struct device *dev)
247{
248 struct fsl_rpmsg *rpmsg = dev_get_drvdata(dev);
249
250 clk_disable_unprepare(rpmsg->dma);
251 clk_disable_unprepare(rpmsg->ipg);
252
253 return 0;
254}
255#endif
256
257static const struct dev_pm_ops fsl_rpmsg_pm_ops = {
258 SET_RUNTIME_PM_OPS(fsl_rpmsg_runtime_suspend,
259 fsl_rpmsg_runtime_resume,
260 NULL)
261 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
262 pm_runtime_force_resume)
263};
264
265static struct platform_driver fsl_rpmsg_driver = {
266 .probe = fsl_rpmsg_probe,
267 .remove = fsl_rpmsg_remove,
268 .driver = {
269 .name = "fsl_rpmsg",
270 .pm = &fsl_rpmsg_pm_ops,
271 .of_match_table = fsl_rpmsg_ids,
272 },
273};
274module_platform_driver(fsl_rpmsg_driver);
275
276MODULE_DESCRIPTION("Freescale SoC Audio PRMSG CPU Interface");
277MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
278MODULE_ALIAS("platform:fsl_rpmsg");
279MODULE_LICENSE("GPL");
280
