drivers/mfd/davinci_voicecodec.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * DaVinci Voice Codec Core Interface for TI platforms
   4  *
   5  * Copyright (C) 2010 Texas Instruments, Inc
   6  *
   7  * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/device.h>
  13 #include <linux/slab.h>
  14 #include <linux/delay.h>
  15 #include <linux/io.h>
  16 #include <linux/clk.h>
  17 #include <linux/regmap.h>
  18
  19 #include <sound/pcm.h>
  20
  21 #include <linux/mfd/davinci_voicecodec.h>
  22
  23 static const struct regmap_config davinci_vc_regmap = {
  24         .reg_bits = 32,
  25         .val_bits = 32,
  26 };
  27
  28 static int __init davinci_vc_probe(struct platform_device *pdev)
  29 {
  30         struct davinci_vc *davinci_vc;
  31         struct resource *res;
  32         struct mfd_cell *cell = NULL;
  33         dma_addr_t fifo_base;
  34         int ret;
  35
  36         davinci_vc = devm_kzalloc(&pdev->dev,
  37                                   sizeof(struct davinci_vc), GFP_KERNEL);
  38         if (!davinci_vc)
  39                 return -ENOMEM;
  40
  41         davinci_vc->clk = devm_clk_get(&pdev->dev, NULL);
  42         if (IS_ERR(davinci_vc->clk)) {
  43                 dev_dbg(&pdev->dev,
  44                             "could not get the clock for voice codec\n");
  45                 return -ENODEV;
  46         }
  47         clk_enable(davinci_vc->clk);
  48
  49         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  50
  51         fifo_base = (dma_addr_t)res->start;
  52         davinci_vc->base = devm_ioremap_resource(&pdev->dev, res);
  53         if (IS_ERR(davinci_vc->base)) {
  54                 ret = PTR_ERR(davinci_vc->base);
  55                 goto fail;
  56         }
  57
  58         davinci_vc->regmap = devm_regmap_init_mmio(&pdev->dev,
  59                                                    davinci_vc->base,
  60                                                    &davinci_vc_regmap);
  61         if (IS_ERR(davinci_vc->regmap)) {
  62                 ret = PTR_ERR(davinci_vc->regmap);
  63                 goto fail;
  64         }
  65
  66         res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
  67         if (!res) {
  68                 dev_err(&pdev->dev, "no DMA resource\n");
  69                 ret = -ENXIO;
  70                 goto fail;
  71         }
  72
  73         davinci_vc->davinci_vcif.dma_tx_channel = res->start;
  74         davinci_vc->davinci_vcif.dma_tx_addr = fifo_base + DAVINCI_VC_WFIFO;
  75
  76         res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
  77         if (!res) {
  78                 dev_err(&pdev->dev, "no DMA resource\n");
  79                 ret = -ENXIO;
  80                 goto fail;
  81         }
  82
  83         davinci_vc->davinci_vcif.dma_rx_channel = res->start;
  84         davinci_vc->davinci_vcif.dma_rx_addr = fifo_base + DAVINCI_VC_RFIFO;
  85
  86         davinci_vc->dev = &pdev->dev;
  87         davinci_vc->pdev = pdev;
  88
  89         /* Voice codec interface client */
  90         cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
  91         cell->name = "davinci-vcif";
  92         cell->platform_data = davinci_vc;
  93         cell->pdata_size = sizeof(*davinci_vc);
  94
  95         /* Voice codec CQ93VC client */
  96         cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
  97         cell->name = "cq93vc-codec";
  98         cell->platform_data = davinci_vc;
  99         cell->pdata_size = sizeof(*davinci_vc);
 100
 101         ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
 102                               DAVINCI_VC_CELLS, NULL, 0, NULL);
 103         if (ret != 0) {
 104                 dev_err(&pdev->dev, "fail to register client devices\n");
 105                 goto fail;
 106         }
 107
 108         return 0;
 109
 110 fail:
 111         clk_disable(davinci_vc->clk);
 112
 113         return ret;
 114 }
 115
 116 static int davinci_vc_remove(struct platform_device *pdev)
 117 {
 118         struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
 119
 120         mfd_remove_devices(&pdev->dev);
 121
 122         clk_disable(davinci_vc->clk);
 123
 124         return 0;
 125 }
 126
 127 static struct platform_driver davinci_vc_driver = {
 128         .driver = {
 129                 .name = "davinci_voicecodec",
 130         },
 131         .remove = davinci_vc_remove,
 132 };
 133
 134 module_platform_driver_probe(davinci_vc_driver, davinci_vc_probe);
 135
 136 MODULE_AUTHOR("Miguel Aguilar");
 137 MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
 138 MODULE_LICENSE("GPL");