Pileus Git - ~andy/linux/blob - 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/delay.h>
  27 #include <linux/io.h>
  28 #include <linux/clk.h>
  29
  30 #include <sound/pcm.h>
  31
  32 #include <linux/mfd/davinci_voicecodec.h>
  33
  34 u32 davinci_vc_read(struct davinci_vc *davinci_vc, int reg)
  35 {
  36         return __raw_readl(davinci_vc->base + reg);
  37 }
  38
  39 void davinci_vc_write(struct davinci_vc *davinci_vc,
  40                                            int reg, u32 val)
  41 {
  42         __raw_writel(val, davinci_vc->base + reg);
  43 }
  44
  45 static int __init davinci_vc_probe(struct platform_device *pdev)
  46 {
  47         struct davinci_vc *davinci_vc;
  48         struct resource *res, *mem;
  49         struct mfd_cell *cell = NULL;
  50         int ret;
  51
  52         davinci_vc = kzalloc(sizeof(struct davinci_vc), GFP_KERNEL);
  53         if (!davinci_vc) {
  54                 dev_dbg(&pdev->dev,
  55                             "could not allocate memory for private data\n");
  56                 return -ENOMEM;
  57         }
  58
  59         davinci_vc->clk = clk_get(&pdev->dev, NULL);
  60         if (IS_ERR(davinci_vc->clk)) {
  61                 dev_dbg(&pdev->dev,
  62                             "could not get the clock for voice codec\n");
  63                 ret = -ENODEV;
  64                 goto fail1;
  65         }
  66         clk_enable(davinci_vc->clk);
  67
  68         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  69         if (!res) {
  70                 dev_err(&pdev->dev, "no mem resource\n");
  71                 ret = -ENODEV;
  72                 goto fail2;
  73         }
  74
  75         davinci_vc->pbase = res->start;
  76         davinci_vc->base_size = resource_size(res);
  77
  78         mem = request_mem_region(davinci_vc->pbase, davinci_vc->base_size,
  79                                  pdev->name);
  80         if (!mem) {
  81                 dev_err(&pdev->dev, "VCIF region already claimed\n");
  82                 ret = -EBUSY;
  83                 goto fail2;
  84         }
  85
  86         davinci_vc->base = ioremap(davinci_vc->pbase, davinci_vc->base_size);
  87         if (!davinci_vc->base) {
  88                 dev_err(&pdev->dev, "can't ioremap mem resource.\n");
  89                 ret = -ENOMEM;
  90                 goto fail3;
  91         }
  92
  93         res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
  94         if (!res) {
  95                 dev_err(&pdev->dev, "no DMA resource\n");
  96                 return -ENXIO;
  97         }
  98
  99         davinci_vc->davinci_vcif.dma_tx_channel = res->start;
 100         davinci_vc->davinci_vcif.dma_tx_addr =
 101                 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO);
 102
 103         res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 104         if (!res) {
 105                 dev_err(&pdev->dev, "no DMA resource\n");
 106                 return -ENXIO;
 107         }
 108
 109         davinci_vc->davinci_vcif.dma_rx_channel = res->start;
 110         davinci_vc->davinci_vcif.dma_rx_addr =
 111                 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO);
 112
 113         davinci_vc->dev = &pdev->dev;
 114         davinci_vc->pdev = pdev;
 115
 116         /* Voice codec interface client */
 117         cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
 118         cell->name = "davinci_vcif";
 119         cell->driver_data = davinci_vc;
 120
 121         /* Voice codec CQ93VC client */
 122         cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
 123         cell->name = "cq93vc";
 124         cell->driver_data = davinci_vc;
 125
 126         ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
 127                               DAVINCI_VC_CELLS, NULL, 0);
 128         if (ret != 0) {
 129                 dev_err(&pdev->dev, "fail to register client devices\n");
 130                 goto fail4;
 131         }
 132
 133         return 0;
 134
 135 fail4:
 136         iounmap(davinci_vc->base);
 137 fail3:
 138         release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
 139 fail2:
 140         clk_disable(davinci_vc->clk);
 141         clk_put(davinci_vc->clk);
 142         davinci_vc->clk = NULL;
 143 fail1:
 144         kfree(davinci_vc);
 145
 146         return ret;
 147 }
 148
 149 static int __devexit davinci_vc_remove(struct platform_device *pdev)
 150 {
 151         struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
 152
 153         mfd_remove_devices(&pdev->dev);
 154
 155         iounmap(davinci_vc->base);
 156         release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
 157
 158         clk_disable(davinci_vc->clk);
 159         clk_put(davinci_vc->clk);
 160         davinci_vc->clk = NULL;
 161
 162         kfree(davinci_vc);
 163
 164         return 0;
 165 }
 166
 167 static struct platform_driver davinci_vc_driver = {
 168         .driver = {
 169                 .name = "davinci_voicecodec",
 170                 .owner = THIS_MODULE,
 171         },
 172         .remove = __devexit_p(davinci_vc_remove),
 173 };
 174
 175 static int __init davinci_vc_init(void)
 176 {
 177         return platform_driver_probe(&davinci_vc_driver, davinci_vc_probe);
 178 }
 179 module_init(davinci_vc_init);
 180
 181 static void __exit davinci_vc_exit(void)
 182 {
 183         platform_driver_unregister(&davinci_vc_driver);
 184 }
 185 module_exit(davinci_vc_exit);
 186
 187 MODULE_AUTHOR("Miguel Aguilar");
 188 MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
 189 MODULE_LICENSE("GPL");