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         davinci_vc->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
  50         if (IS_ERR(davinci_vc->base)) {
  51                 ret = PTR_ERR(davinci_vc->base);
  52                 goto fail;
  53         }
  54         fifo_base = (dma_addr_t)res->start;
  55
  56         davinci_vc->regmap = devm_regmap_init_mmio(&pdev->dev,
  57                                                    davinci_vc->base,
  58                                                    &davinci_vc_regmap);
  59         if (IS_ERR(davinci_vc->regmap)) {
  60                 ret = PTR_ERR(davinci_vc->regmap);
  61                 goto fail;
  62         }
  63
  64         res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
  65         if (!res) {
  66                 dev_err(&pdev->dev, "no DMA resource\n");
  67                 ret = -ENXIO;
  68                 goto fail;
  69         }
  70
  71         davinci_vc->davinci_vcif.dma_tx_channel = res->start;
  72         davinci_vc->davinci_vcif.dma_tx_addr = fifo_base + DAVINCI_VC_WFIFO;
  73
  74         res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
  75         if (!res) {
  76                 dev_err(&pdev->dev, "no DMA resource\n");
  77                 ret = -ENXIO;
  78                 goto fail;
  79         }
  80
  81         davinci_vc->davinci_vcif.dma_rx_channel = res->start;
  82         davinci_vc->davinci_vcif.dma_rx_addr = fifo_base + DAVINCI_VC_RFIFO;
  83
  84         davinci_vc->dev = &pdev->dev;
  85         davinci_vc->pdev = pdev;
  86
  87         /* Voice codec interface client */
  88         cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
  89         cell->name = "davinci-vcif";
  90         cell->platform_data = davinci_vc;
  91         cell->pdata_size = sizeof(*davinci_vc);
  92
  93         /* Voice codec CQ93VC client */
  94         cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
  95         cell->name = "cq93vc-codec";
  96         cell->platform_data = davinci_vc;
  97         cell->pdata_size = sizeof(*davinci_vc);
  98
  99         ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
 100                               DAVINCI_VC_CELLS, NULL, 0, NULL);
 101         if (ret != 0) {
 102                 dev_err(&pdev->dev, "fail to register client devices\n");
 103                 goto fail;
 104         }
 105
 106         return 0;
 107
 108 fail:
 109         clk_disable(davinci_vc->clk);
 110
 111         return ret;
 112 }
 113
 114 static int davinci_vc_remove(struct platform_device *pdev)
 115 {
 116         struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
 117
 118         mfd_remove_devices(&pdev->dev);
 119
 120         clk_disable(davinci_vc->clk);
 121
 122         return 0;
 123 }
 124
 125 static struct platform_driver davinci_vc_driver = {
 126         .driver = {
 127                 .name = "davinci_voicecodec",
 128         },
 129         .remove = davinci_vc_remove,
 130 };
 131
 132 module_platform_driver_probe(davinci_vc_driver, davinci_vc_probe);
 133
 134 MODULE_AUTHOR("Miguel Aguilar");
 135 MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
 136 MODULE_LICENSE("GPL");