sound/soc/fsl/fsl_rpmsg.c

   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
  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
  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
  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 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         { /* sentinel */ }
 147 };
 148 MODULE_DEVICE_TABLE(of, fsl_rpmsg_ids);
 149
 150 static 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         /* Get the optional clocks */
 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
 210 static 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
 221 static 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
 240 dma_err:
 241         clk_disable_unprepare(rpmsg->ipg);
 242 ipg_err:
 243         return ret;
 244 }
 245
 246 static 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
 257 static 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
 265 static 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 };
 274 module_platform_driver(fsl_rpmsg_driver);
 275
 276 MODULE_DESCRIPTION("Freescale SoC Audio PRMSG CPU Interface");
 277 MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
 278 MODULE_ALIAS("platform:fsl_rpmsg");
 279 MODULE_LICENSE("GPL");