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, *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->mfd_data = davinci_vc;
 123
 124         /* Voice codec CQ93VC client */
 125         cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
 126         cell->name = "cq93vc-codec";
 127         cell->mfd_data = davinci_vc;
 128
 129         ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
 130                               DAVINCI_VC_CELLS, NULL, 0);
 131         if (ret != 0) {
 132                 dev_err(&pdev->dev, "fail to register client devices\n");
 133                 goto fail4;
 134         }
 135
 136         return 0;
 137
 138 fail4:
 139         iounmap(davinci_vc->base);
 140 fail3:
 141         release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
 142 fail2:
 143         clk_disable(davinci_vc->clk);
 144         clk_put(davinci_vc->clk);
 145         davinci_vc->clk = NULL;
 146 fail1:
 147         kfree(davinci_vc);
 148
 149         return ret;
 150 }
 151
 152 static int __devexit davinci_vc_remove(struct platform_device *pdev)
 153 {
 154         struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
 155
 156         mfd_remove_devices(&pdev->dev);
 157
 158         iounmap(davinci_vc->base);
 159         release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
 160
 161         clk_disable(davinci_vc->clk);
 162         clk_put(davinci_vc->clk);
 163         davinci_vc->clk = NULL;
 164
 165         kfree(davinci_vc);
 166
 167         return 0;
 168 }
 169
 170 static struct platform_driver davinci_vc_driver = {
 171         .driver = {
 172                 .name = "davinci_voicecodec",
 173                 .owner = THIS_MODULE,
 174         },
 175         .remove = __devexit_p(davinci_vc_remove),
 176 };
 177
 178 static int __init davinci_vc_init(void)
 179 {
 180         return platform_driver_probe(&davinci_vc_driver, davinci_vc_probe);
 181 }
 182 module_init(davinci_vc_init);
 183
 184 static void __exit davinci_vc_exit(void)
 185 {
 186         platform_driver_unregister(&davinci_vc_driver);
 187 }
 188 module_exit(davinci_vc_exit);
 189
 190 MODULE_AUTHOR("Miguel Aguilar");
 191 MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
 192 MODULE_LICENSE("GPL");