sound/soc/img/img-parallel-out.c

   1 /*
   2  * IMG parallel output controller driver
   3  *
   4  * Copyright (C) 2015 Imagination Technologies Ltd.
   5  *
   6  * Author: Damien Horsley <Damien.Horsley@imgtec.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms and conditions of the GNU General Public License,
  10  * version 2, as published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/clk.h>
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/reset.h>
  21
  22 #include <sound/core.h>
  23 #include <sound/dmaengine_pcm.h>
  24 #include <sound/initval.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include <sound/soc.h>
  28
  29 #define IMG_PRL_OUT_TX_FIFO             0
  30
  31 #define IMG_PRL_OUT_CTL                 0x4
  32 #define IMG_PRL_OUT_CTL_CH_MASK         BIT(4)
  33 #define IMG_PRL_OUT_CTL_PACKH_MASK      BIT(3)
  34 #define IMG_PRL_OUT_CTL_EDGE_MASK       BIT(2)
  35 #define IMG_PRL_OUT_CTL_ME_MASK         BIT(1)
  36 #define IMG_PRL_OUT_CTL_SRST_MASK       BIT(0)
  37
  38 struct img_prl_out {
  39         void __iomem *base;
  40         struct clk *clk_sys;
  41         struct clk *clk_ref;
  42         struct snd_dmaengine_dai_dma_data dma_data;
  43         struct device *dev;
  44         struct reset_control *rst;
  45 };
  46
  47 static int img_prl_out_suspend(struct device *dev)
  48 {
  49         struct img_prl_out *prl = dev_get_drvdata(dev);
  50
  51         clk_disable_unprepare(prl->clk_ref);
  52
  53         return 0;
  54 }
  55
  56 static int img_prl_out_resume(struct device *dev)
  57 {
  58         struct img_prl_out *prl = dev_get_drvdata(dev);
  59         int ret;
  60
  61         ret = clk_prepare_enable(prl->clk_ref);
  62         if (ret) {
  63                 dev_err(dev, "clk_enable failed: %d\n", ret);
  64                 return ret;
  65         }
  66
  67         return 0;
  68 }
  69
  70 static inline void img_prl_out_writel(struct img_prl_out *prl,
  71                                 u32 val, u32 reg)
  72 {
  73         writel(val, prl->base + reg);
  74 }
  75
  76 static inline u32 img_prl_out_readl(struct img_prl_out *prl, u32 reg)
  77 {
  78         return readl(prl->base + reg);
  79 }
  80
  81 static void img_prl_out_reset(struct img_prl_out *prl)
  82 {
  83         u32 ctl;
  84
  85         ctl = img_prl_out_readl(prl, IMG_PRL_OUT_CTL) &
  86                         ~IMG_PRL_OUT_CTL_ME_MASK;
  87
  88         reset_control_assert(prl->rst);
  89         reset_control_deassert(prl->rst);
  90
  91         img_prl_out_writel(prl, ctl, IMG_PRL_OUT_CTL);
  92 }
  93
  94 static int img_prl_out_trigger(struct snd_pcm_substream *substream, int cmd,
  95                         struct snd_soc_dai *dai)
  96 {
  97         struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai);
  98         u32 reg;
  99
 100         switch (cmd) {
 101         case SNDRV_PCM_TRIGGER_START:
 102         case SNDRV_PCM_TRIGGER_RESUME:
 103         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 104                 reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL);
 105                 reg |= IMG_PRL_OUT_CTL_ME_MASK;
 106                 img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL);
 107                 break;
 108         case SNDRV_PCM_TRIGGER_STOP:
 109         case SNDRV_PCM_TRIGGER_SUSPEND:
 110         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 111                 img_prl_out_reset(prl);
 112                 break;
 113         default:
 114                 return -EINVAL;
 115         }
 116
 117         return 0;
 118 }
 119
 120 static int img_prl_out_hw_params(struct snd_pcm_substream *substream,
 121         struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 122 {
 123         struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai);
 124         unsigned int rate, channels;
 125         u32 reg, control_set = 0;
 126         snd_pcm_format_t format;
 127
 128         rate = params_rate(params);
 129         format = params_format(params);
 130         channels = params_channels(params);
 131
 132         switch (params_format(params)) {
 133         case SNDRV_PCM_FORMAT_S32_LE:
 134                 control_set |= IMG_PRL_OUT_CTL_PACKH_MASK;
 135                 break;
 136         case SNDRV_PCM_FORMAT_S24_LE:
 137                 break;
 138         default:
 139                 return -EINVAL;
 140         }
 141
 142         if (channels != 2)
 143                 return -EINVAL;
 144
 145         clk_set_rate(prl->clk_ref, rate * 256);
 146
 147         reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL);
 148         reg = (reg & ~IMG_PRL_OUT_CTL_PACKH_MASK) | control_set;
 149         img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL);
 150
 151         return 0;
 152 }
 153
 154 static int img_prl_out_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 155 {
 156         struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai);
 157         u32 reg, control_set = 0;
 158
 159         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 160         case SND_SOC_DAIFMT_NB_NF:
 161                 break;
 162         case SND_SOC_DAIFMT_NB_IF:
 163                 control_set |= IMG_PRL_OUT_CTL_EDGE_MASK;
 164                 break;
 165         default:
 166                 return -EINVAL;
 167         }
 168
 169         reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL);
 170         reg = (reg & ~IMG_PRL_OUT_CTL_EDGE_MASK) | control_set;
 171         img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL);
 172
 173         return 0;
 174 }
 175
 176 static const struct snd_soc_dai_ops img_prl_out_dai_ops = {
 177         .trigger = img_prl_out_trigger,
 178         .hw_params = img_prl_out_hw_params,
 179         .set_fmt = img_prl_out_set_fmt
 180 };
 181
 182 static int img_prl_out_dai_probe(struct snd_soc_dai *dai)
 183 {
 184         struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai);
 185
 186         snd_soc_dai_init_dma_data(dai, &prl->dma_data, NULL);
 187
 188         return 0;
 189 }
 190
 191 static struct snd_soc_dai_driver img_prl_out_dai = {
 192         .probe = img_prl_out_dai_probe,
 193         .playback = {
 194                 .channels_min = 2,
 195                 .channels_max = 2,
 196                 .rates = SNDRV_PCM_RATE_8000_192000,
 197                 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S24_LE
 198         },
 199         .ops = &img_prl_out_dai_ops
 200 };
 201
 202 static const struct snd_soc_component_driver img_prl_out_component = {
 203         .name = "img-prl-out"
 204 };
 205
 206 static int img_prl_out_probe(struct platform_device *pdev)
 207 {
 208         struct img_prl_out *prl;
 209         struct resource *res;
 210         void __iomem *base;
 211         int ret;
 212         struct device *dev = &pdev->dev;
 213
 214         prl = devm_kzalloc(&pdev->dev, sizeof(*prl), GFP_KERNEL);
 215         if (!prl)
 216                 return -ENOMEM;
 217
 218         platform_set_drvdata(pdev, prl);
 219
 220         prl->dev = &pdev->dev;
 221
 222         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 223         base = devm_ioremap_resource(&pdev->dev, res);
 224         if (IS_ERR(base))
 225                 return PTR_ERR(base);
 226
 227         prl->base = base;
 228
 229         prl->rst = devm_reset_control_get(&pdev->dev, "rst");
 230         if (IS_ERR(prl->rst)) {
 231                 if (PTR_ERR(prl->rst) != -EPROBE_DEFER)
 232                         dev_err(&pdev->dev, "No top level reset found\n");
 233                 return PTR_ERR(prl->rst);
 234         }
 235
 236         prl->clk_sys = devm_clk_get(&pdev->dev, "sys");
 237         if (IS_ERR(prl->clk_sys)) {
 238                 if (PTR_ERR(prl->clk_sys) != -EPROBE_DEFER)
 239                         dev_err(dev, "Failed to acquire clock 'sys'\n");
 240                 return PTR_ERR(prl->clk_sys);
 241         }
 242
 243         prl->clk_ref = devm_clk_get(&pdev->dev, "ref");
 244         if (IS_ERR(prl->clk_ref)) {
 245                 if (PTR_ERR(prl->clk_ref) != -EPROBE_DEFER)
 246                         dev_err(dev, "Failed to acquire clock 'ref'\n");
 247                 return PTR_ERR(prl->clk_ref);
 248         }
 249
 250         ret = clk_prepare_enable(prl->clk_sys);
 251         if (ret)
 252                 return ret;
 253
 254         img_prl_out_writel(prl, IMG_PRL_OUT_CTL_EDGE_MASK, IMG_PRL_OUT_CTL);
 255         img_prl_out_reset(prl);
 256
 257         pm_runtime_enable(&pdev->dev);
 258         if (!pm_runtime_enabled(&pdev->dev)) {
 259                 ret = img_prl_out_resume(&pdev->dev);
 260                 if (ret)
 261                         goto err_pm_disable;
 262         }
 263
 264         prl->dma_data.addr = res->start + IMG_PRL_OUT_TX_FIFO;
 265         prl->dma_data.addr_width = 4;
 266         prl->dma_data.maxburst = 4;
 267
 268         ret = devm_snd_soc_register_component(&pdev->dev,
 269                         &img_prl_out_component,
 270                         &img_prl_out_dai, 1);
 271         if (ret)
 272                 goto err_suspend;
 273
 274         ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 275         if (ret)
 276                 goto err_suspend;
 277
 278         return 0;
 279
 280 err_suspend:
 281         if (!pm_runtime_status_suspended(&pdev->dev))
 282                 img_prl_out_suspend(&pdev->dev);
 283 err_pm_disable:
 284         pm_runtime_disable(&pdev->dev);
 285         clk_disable_unprepare(prl->clk_sys);
 286
 287         return ret;
 288 }
 289
 290 static int img_prl_out_dev_remove(struct platform_device *pdev)
 291 {
 292         struct img_prl_out *prl = platform_get_drvdata(pdev);
 293
 294         pm_runtime_disable(&pdev->dev);
 295         if (!pm_runtime_status_suspended(&pdev->dev))
 296                 img_prl_out_suspend(&pdev->dev);
 297
 298         clk_disable_unprepare(prl->clk_sys);
 299
 300         return 0;
 301 }
 302
 303 static const struct of_device_id img_prl_out_of_match[] = {
 304         { .compatible = "img,parallel-out" },
 305         {}
 306 };
 307 MODULE_DEVICE_TABLE(of, img_prl_out_of_match);
 308
 309 static const struct dev_pm_ops img_prl_out_pm_ops = {
 310         SET_RUNTIME_PM_OPS(img_prl_out_suspend,
 311                            img_prl_out_resume, NULL)
 312 };
 313
 314 static struct platform_driver img_prl_out_driver = {
 315         .driver = {
 316                 .name = "img-parallel-out",
 317                 .of_match_table = img_prl_out_of_match,
 318                 .pm = &img_prl_out_pm_ops
 319         },
 320         .probe = img_prl_out_probe,
 321         .remove = img_prl_out_dev_remove
 322 };
 323 module_platform_driver(img_prl_out_driver);
 324
 325 MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
 326 MODULE_DESCRIPTION("IMG Parallel Output Driver");
 327 MODULE_LICENSE("GPL v2");