LXR linux/drivers/mfd/davinci

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