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 #include <linux/regmap.h>
  31
  32 #include <sound/pcm.h>
  33
  34 #include <linux/mfd/davinci_voicecodec.h>
  35
  36 static struct regmap_config davinci_vc_regmap = {
  37         .reg_bits = 32,
  38         .val_bits = 32,
  39 };
  40
  41 static 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
 126 fail:
 127         clk_disable(davinci_vc->clk);
 128
 129         return ret;
 130 }
 131
 132 static 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
 143 static struct platform_driver davinci_vc_driver = {
 144         .driver = {
 145                 .name = "davinci_voicecodec",
 146                 .owner = THIS_MODULE,
 147         },
 148         .remove = davinci_vc_remove,
 149 };
 150
 151 module_platform_driver_probe(davinci_vc_driver, davinci_vc_probe);
 152
 153 MODULE_AUTHOR("Miguel Aguilar");
 154 MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
 155 MODULE_LICENSE("GPL");