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, *mem;
  50        struct mfd_cell *cell = NULL;
  51        int ret;
  52
  53        davinci_vc = kzalloc(sizeof(struct davinci_vc), GFP_KERNEL);
  54        if (!davinci_vc) {
  55                dev_dbg(&pdev->dev,
  56                            "could not allocate memory for private data\n");
  57                return -ENOMEM;
  58        }
  59
  60        davinci_vc->clk = clk_get(&pdev->dev, NULL);
  61        if (IS_ERR(davinci_vc->clk)) {
  62                dev_dbg(&pdev->dev,
  63                            "could not get the clock for voice codec\n");
  64                ret = -ENODEV;
  65                goto fail1;
  66        }
  67        clk_enable(davinci_vc->clk);
  68
  69        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  70        if (!res) {
  71                dev_err(&pdev->dev, "no mem resource\n");
  72                ret = -ENODEV;
  73                goto fail2;
  74        }
  75
  76        davinci_vc->pbase = res->start;
  77        davinci_vc->base_size = resource_size(res);
  78
  79        mem = request_mem_region(davinci_vc->pbase, davinci_vc->base_size,
  80                                 pdev->name);
  81        if (!mem) {
  82                dev_err(&pdev->dev, "VCIF region already claimed\n");
  83                ret = -EBUSY;
  84                goto fail2;
  85        }
  86
  87        davinci_vc->base = ioremap(davinci_vc->pbase, davinci_vc->base_size);
  88        if (!davinci_vc->base) {
  89                dev_err(&pdev->dev, "can't ioremap mem resource.\n");
  90                ret = -ENOMEM;
  91                goto fail3;
  92        }
  93
  94        res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
  95        if (!res) {
  96                dev_err(&pdev->dev, "no DMA resource\n");
  97                ret = -ENXIO;
  98                goto fail4;
  99        }
 100
 101        davinci_vc->davinci_vcif.dma_tx_channel = res->start;
 102        davinci_vc->davinci_vcif.dma_tx_addr =
 103                (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO);
 104
 105        res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 106        if (!res) {
 107                dev_err(&pdev->dev, "no DMA resource\n");
 108                ret = -ENXIO;
 109                goto fail4;
 110        }
 111
 112        davinci_vc->davinci_vcif.dma_rx_channel = res->start;
 113        davinci_vc->davinci_vcif.dma_rx_addr =
 114                (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO);
 115
 116        davinci_vc->dev = &pdev->dev;
 117        davinci_vc->pdev = pdev;
 118
 119        /* Voice codec interface client */
 120        cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
 121        cell->name = "davinci-vcif";
 122        cell->platform_data = davinci_vc;
 123        cell->pdata_size = sizeof(*davinci_vc);
 124
 125        /* Voice codec CQ93VC client */
 126        cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
 127        cell->name = "cq93vc-codec";
 128        cell->platform_data = davinci_vc;
 129        cell->pdata_size = sizeof(*davinci_vc);
 130
 131        ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
 132                              DAVINCI_VC_CELLS, NULL, 0, NULL);
 133        if (ret != 0) {
 134                dev_err(&pdev->dev, "fail to register client devices\n");
 135                goto fail4;
 136        }
 137
 138        return 0;
 139
 140fail4:
 141        iounmap(davinci_vc->base);
 142fail3:
 143        release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
 144fail2:
 145        clk_disable(davinci_vc->clk);
 146        clk_put(davinci_vc->clk);
 147        davinci_vc->clk = NULL;
 148fail1:
 149        kfree(davinci_vc);
 150
 151        return ret;
 152}
 153
 154static int davinci_vc_remove(struct platform_device *pdev)
 155{
 156        struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
 157
 158        mfd_remove_devices(&pdev->dev);
 159
 160        iounmap(davinci_vc->base);
 161        release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
 162
 163        clk_disable(davinci_vc->clk);
 164        clk_put(davinci_vc->clk);
 165        davinci_vc->clk = NULL;
 166
 167        kfree(davinci_vc);
 168
 169        return 0;
 170}
 171
 172static struct platform_driver davinci_vc_driver = {
 173        .driver = {
 174                .name = "davinci_voicecodec",
 175                .owner = THIS_MODULE,
 176        },
 177        .remove = davinci_vc_remove,
 178};
 179
 180static int __init davinci_vc_init(void)
 181{
 182        return platform_driver_probe(&davinci_vc_driver, davinci_vc_probe);
 183}
 184module_init(davinci_vc_init);
 185
 186static void __exit davinci_vc_exit(void)
 187{
 188        platform_driver_unregister(&davinci_vc_driver);
 189}
 190module_exit(davinci_vc_exit);
 191
 192MODULE_AUTHOR("Miguel Aguilar");
 193MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
 194MODULE_LICENSE("GPL");
 195
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