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
  31#include <sound/pcm.h>
  32
  33#include <linux/mfd/davinci_voicecodec.h>
  34
  35u32 davinci_vc_read(struct davinci_vc *davinci_vc, int reg)
  36{
  37        return __raw_readl(davinci_vc->base + reg);
  38}
  39
  40void davinci_vc_write(struct davinci_vc *davinci_vc,
  41                                           int reg, u32 val)
  42{
  43        __raw_writel(val, davinci_vc->base + reg);
  44}
  45
  46static int __init davinci_vc_probe(struct platform_device *pdev)
  47{
  48        struct davinci_vc *davinci_vc;
  49        struct resource *res;
  50        struct mfd_cell *cell = NULL;
  51        int ret;
  52
  53        davinci_vc = devm_kzalloc(&pdev->dev,
  54                                  sizeof(struct davinci_vc), GFP_KERNEL);
  55        if (!davinci_vc) {
  56                dev_dbg(&pdev->dev,
  57                            "could not allocate memory for private data\n");
  58                return -ENOMEM;
  59        }
  60
  61        davinci_vc->clk = devm_clk_get(&pdev->dev, NULL);
  62        if (IS_ERR(davinci_vc->clk)) {
  63                dev_dbg(&pdev->dev,
  64                            "could not get the clock for voice codec\n");
  65                return -ENODEV;
  66        }
  67        clk_enable(davinci_vc->clk);
  68
  69        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  70
  71        davinci_vc->base = devm_ioremap_resource(&pdev->dev, res);
  72        if (IS_ERR(davinci_vc->base)) {
  73                ret = PTR_ERR(davinci_vc->base);
  74                goto fail;
  75        }
  76
  77        res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
  78        if (!res) {
  79                dev_err(&pdev->dev, "no DMA resource\n");
  80                ret = -ENXIO;
  81                goto fail;
  82        }
  83
  84        davinci_vc->davinci_vcif.dma_tx_channel = res->start;
  85        davinci_vc->davinci_vcif.dma_tx_addr =
  86                (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO);
  87
  88        res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
  89        if (!res) {
  90                dev_err(&pdev->dev, "no DMA resource\n");
  91                ret = -ENXIO;
  92                goto fail;
  93        }
  94
  95        davinci_vc->davinci_vcif.dma_rx_channel = res->start;
  96        davinci_vc->davinci_vcif.dma_rx_addr =
  97                (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO);
  98
  99        davinci_vc->dev = &pdev->dev;
 100        davinci_vc->pdev = pdev;
 101
 102        /* Voice codec interface client */
 103        cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
 104        cell->name = "davinci-vcif";
 105        cell->platform_data = davinci_vc;
 106        cell->pdata_size = sizeof(*davinci_vc);
 107
 108        /* Voice codec CQ93VC client */
 109        cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
 110        cell->name = "cq93vc-codec";
 111        cell->platform_data = davinci_vc;
 112        cell->pdata_size = sizeof(*davinci_vc);
 113
 114        ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
 115                              DAVINCI_VC_CELLS, NULL, 0, NULL);
 116        if (ret != 0) {
 117                dev_err(&pdev->dev, "fail to register client devices\n");
 118                goto fail;
 119        }
 120
 121        return 0;
 122
 123fail:
 124        clk_disable(davinci_vc->clk);
 125
 126        return ret;
 127}
 128
 129static int davinci_vc_remove(struct platform_device *pdev)
 130{
 131        struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
 132
 133        mfd_remove_devices(&pdev->dev);
 134
 135        clk_disable(davinci_vc->clk);
 136
 137        return 0;
 138}
 139
 140static struct platform_driver davinci_vc_driver = {
 141        .driver = {
 142                .name = "davinci_voicecodec",
 143                .owner = THIS_MODULE,
 144        },
 145        .remove = davinci_vc_remove,
 146};
 147
 148module_platform_driver_probe(davinci_vc_driver, davinci_vc_probe);
 149
 150MODULE_AUTHOR("Miguel Aguilar");
 151MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
 152MODULE_LICENSE("GPL");
 153
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