linux/drivers/mfd/davinci_voicecodec.c
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   1/*
   2 * DaVinci Voice Codec Core Interface for TI platforms
   3 *
   4 * Copyright (C) 2010 Texas Instruments, Inc
   5 *
   6 * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21 */
  22
  23#include <linux/init.h>
  24#include <linux/module.h>
  25#include <linux/device.h>
  26#include <linux/slab.h>
  27#include <linux/delay.h>
  28#include <linux/io.h>
  29#include <linux/clk.h>
  30#include <linux/regmap.h>
  31
  32#include <sound/pcm.h>
  33
  34#include <linux/mfd/davinci_voicecodec.h>
  35
  36static struct regmap_config davinci_vc_regmap = {
  37        .reg_bits = 32,
  38        .val_bits = 32,
  39};
  40
  41static int __init davinci_vc_probe(struct platform_device *pdev)
  42{
  43        struct davinci_vc *davinci_vc;
  44        struct resource *res;
  45        struct mfd_cell *cell = NULL;
  46        int ret;
  47
  48        davinci_vc = devm_kzalloc(&pdev->dev,
  49                                  sizeof(struct davinci_vc), GFP_KERNEL);
  50        if (!davinci_vc) {
  51                dev_dbg(&pdev->dev,
  52                            "could not allocate memory for private data\n");
  53                return -ENOMEM;
  54        }
  55
  56        davinci_vc->clk = devm_clk_get(&pdev->dev, NULL);
  57        if (IS_ERR(davinci_vc->clk)) {
  58                dev_dbg(&pdev->dev,
  59                            "could not get the clock for voice codec\n");
  60                return -ENODEV;
  61        }
  62        clk_enable(davinci_vc->clk);
  63
  64        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  65
  66        davinci_vc->base = devm_ioremap_resource(&pdev->dev, res);
  67        if (IS_ERR(davinci_vc->base)) {
  68                ret = PTR_ERR(davinci_vc->base);
  69                goto fail;
  70        }
  71
  72        davinci_vc->regmap = devm_regmap_init_mmio(&pdev->dev,
  73                                                   davinci_vc->base,
  74                                                   &davinci_vc_regmap);
  75        if (IS_ERR(davinci_vc->regmap)) {
  76                ret = PTR_ERR(davinci_vc->regmap);
  77                goto fail;
  78        }
  79
  80        res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
  81        if (!res) {
  82                dev_err(&pdev->dev, "no DMA resource\n");
  83                ret = -ENXIO;
  84                goto fail;
  85        }
  86
  87        davinci_vc->davinci_vcif.dma_tx_channel = res->start;
  88        davinci_vc->davinci_vcif.dma_tx_addr =
  89                (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO);
  90
  91        res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
  92        if (!res) {
  93                dev_err(&pdev->dev, "no DMA resource\n");
  94                ret = -ENXIO;
  95                goto fail;
  96        }
  97
  98        davinci_vc->davinci_vcif.dma_rx_channel = res->start;
  99        davinci_vc->davinci_vcif.dma_rx_addr =
 100                (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO);
 101
 102        davinci_vc->dev = &pdev->dev;
 103        davinci_vc->pdev = pdev;
 104
 105        /* Voice codec interface client */
 106        cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
 107        cell->name = "davinci-vcif";
 108        cell->platform_data = davinci_vc;
 109        cell->pdata_size = sizeof(*davinci_vc);
 110
 111        /* Voice codec CQ93VC client */
 112        cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
 113        cell->name = "cq93vc-codec";
 114        cell->platform_data = davinci_vc;
 115        cell->pdata_size = sizeof(*davinci_vc);
 116
 117        ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
 118                              DAVINCI_VC_CELLS, NULL, 0, NULL);
 119        if (ret != 0) {
 120                dev_err(&pdev->dev, "fail to register client devices\n");
 121                goto fail;
 122        }
 123
 124        return 0;
 125
 126fail:
 127        clk_disable(davinci_vc->clk);
 128
 129        return ret;
 130}
 131
 132static int davinci_vc_remove(struct platform_device *pdev)
 133{
 134        struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
 135
 136        mfd_remove_devices(&pdev->dev);
 137
 138        clk_disable(davinci_vc->clk);
 139
 140        return 0;
 141}
 142
 143static struct platform_driver davinci_vc_driver = {
 144        .driver = {
 145                .name = "davinci_voicecodec",
 146                .owner = THIS_MODULE,
 147        },
 148        .remove = davinci_vc_remove,
 149};
 150
 151module_platform_driver_probe(davinci_vc_driver, davinci_vc_probe);
 152
 153MODULE_AUTHOR("Miguel Aguilar");
 154MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
 155MODULE_LICENSE("GPL");
 156
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