drivers/mfd/davinci_voicecodec.c

   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
  35 u32 davinci_vc_read(struct davinci_vc *davinci_vc, int reg)
  36 {
  37         return __raw_readl(davinci_vc->base + reg);
  38 }
  39
  40 void davinci_vc_write(struct davinci_vc *davinci_vc,
  41                                            int reg, u32 val)
  42 {
  43         __raw_writel(val, davinci_vc->base + reg);
  44 }
  45
  46 static 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
 123 fail:
 124         clk_disable(davinci_vc->clk);
 125
 126         return ret;
 127 }
 128
 129 static 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
 140 static struct platform_driver davinci_vc_driver = {
 141         .driver = {
 142                 .name = "davinci_voicecodec",
 143                 .owner = THIS_MODULE,
 144         },
 145         .remove = davinci_vc_remove,
 146 };
 147
 148 module_platform_driver_probe(davinci_vc_driver, davinci_vc_probe);
 149
 150 MODULE_AUTHOR("Miguel Aguilar");
 151 MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
 152 MODULE_LICENSE("GPL");