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 #include <mach/hardware.h>
  36
  37 static const struct regmap_config davinci_vc_regmap = {
  38         .reg_bits = 32,
  39         .val_bits = 32,
  40 };
  41
  42 static 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
 124 fail:
 125         clk_disable(davinci_vc->clk);
 126
 127         return ret;
 128 }
 129
 130 static 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
 141 static struct platform_driver davinci_vc_driver = {
 142         .driver = {
 143                 .name = "davinci_voicecodec",
 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");