sound/soc/blackfin/bf5xx-tdm.c

   1 /*
   2  * File:         sound/soc/blackfin/bf5xx-tdm.c
   3  * Author:       Barry Song <Barry.Song@analog.com>
   4  *
   5  * Created:      Thurs June 04 2009
   6  * Description:  Blackfin I2S(TDM) CPU DAI driver
   7  *              Even though TDM mode can be as part of I2S DAI, but there
   8  *              are so much difference in configuration and data flow,
   9  *              it's very ugly to integrate I2S and TDM into a module
  10  *
  11  * Modified:
  12  *               Copyright 2009 Analog Devices Inc.
  13  *
  14  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, see the file COPYING, or write
  28  * to the Free Software Foundation, Inc.,
  29  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  30  */
  31
  32 #include <linux/init.h>
  33 #include <linux/module.h>
  34 #include <linux/device.h>
  35 #include <sound/core.h>
  36 #include <sound/pcm.h>
  37 #include <sound/pcm_params.h>
  38 #include <sound/initval.h>
  39 #include <sound/soc.h>
  40
  41 #include <asm/irq.h>
  42 #include <asm/portmux.h>
  43 #include <linux/mutex.h>
  44 #include <linux/gpio.h>
  45
  46 #include "bf5xx-sport.h"
  47 #include "bf5xx-tdm.h"
  48
  49 struct bf5xx_tdm_port {
  50         u16 tcr1;
  51         u16 rcr1;
  52         u16 tcr2;
  53         u16 rcr2;
  54         int configured;
  55 };
  56
  57 static struct bf5xx_tdm_port bf5xx_tdm;
  58 static int sport_num = CONFIG_SND_BF5XX_SPORT_NUM;
  59
  60 static struct sport_param sport_params[2] = {
  61         {
  62                 .dma_rx_chan    = CH_SPORT0_RX,
  63                 .dma_tx_chan    = CH_SPORT0_TX,
  64                 .err_irq        = IRQ_SPORT0_ERROR,
  65                 .regs           = (struct sport_register *)SPORT0_TCR1,
  66         },
  67         {
  68                 .dma_rx_chan    = CH_SPORT1_RX,
  69                 .dma_tx_chan    = CH_SPORT1_TX,
  70                 .err_irq        = IRQ_SPORT1_ERROR,
  71                 .regs           = (struct sport_register *)SPORT1_TCR1,
  72         }
  73 };
  74
  75 /*
  76  * Setting the TFS pin selector for SPORT 0 based on whether the selected
  77  * port id F or G. If the port is F then no conflict should exist for the
  78  * TFS. When Port G is selected and EMAC then there is a conflict between
  79  * the PHY interrupt line and TFS.  Current settings prevent the conflict
  80  * by ignoring the TFS pin when Port G is selected. This allows both
  81  * codecs and EMAC using Port G concurrently.
  82  */
  83 #ifdef CONFIG_BF527_SPORT0_PORTG
  84 #define LOCAL_SPORT0_TFS (0)
  85 #else
  86 #define LOCAL_SPORT0_TFS (P_SPORT0_TFS)
  87 #endif
  88
  89 static u16 sport_req[][7] = { {P_SPORT0_DTPRI, P_SPORT0_TSCLK, P_SPORT0_RFS,
  90         P_SPORT0_DRPRI, P_SPORT0_RSCLK, LOCAL_SPORT0_TFS, 0},
  91            {P_SPORT1_DTPRI, P_SPORT1_TSCLK, P_SPORT1_RFS, P_SPORT1_DRPRI,
  92                    P_SPORT1_RSCLK, P_SPORT1_TFS, 0} };
  93
  94 static int bf5xx_tdm_set_dai_fmt(struct snd_soc_dai *cpu_dai,
  95         unsigned int fmt)
  96 {
  97         int ret = 0;
  98
  99         /* interface format:support TDM,slave mode */
 100         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 101         case SND_SOC_DAIFMT_DSP_A:
 102                 break;
 103         default:
 104                 printk(KERN_ERR "%s: Unknown DAI format type\n", __func__);
 105                 ret = -EINVAL;
 106                 break;
 107         }
 108
 109         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 110         case SND_SOC_DAIFMT_CBM_CFM:
 111                 break;
 112         case SND_SOC_DAIFMT_CBS_CFS:
 113         case SND_SOC_DAIFMT_CBM_CFS:
 114         case SND_SOC_DAIFMT_CBS_CFM:
 115                 ret = -EINVAL;
 116                 break;
 117         default:
 118                 printk(KERN_ERR "%s: Unknown DAI master type\n", __func__);
 119                 ret = -EINVAL;
 120                 break;
 121         }
 122
 123         return ret;
 124 }
 125
 126 static int bf5xx_tdm_hw_params(struct snd_pcm_substream *substream,
 127         struct snd_pcm_hw_params *params,
 128         struct snd_soc_dai *dai)
 129 {
 130         int ret = 0;
 131
 132         bf5xx_tdm.tcr2 &= ~0x1f;
 133         bf5xx_tdm.rcr2 &= ~0x1f;
 134         switch (params_format(params)) {
 135         case SNDRV_PCM_FORMAT_S32_LE:
 136                 bf5xx_tdm.tcr2 |= 31;
 137                 bf5xx_tdm.rcr2 |= 31;
 138                 sport_handle->wdsize = 4;
 139                 break;
 140                 /* at present, we only support 32bit transfer */
 141         default:
 142                 pr_err("not supported PCM format yet\n");
 143                 return -EINVAL;
 144                 break;
 145         }
 146
 147         if (!bf5xx_tdm.configured) {
 148                 /*
 149                  * TX and RX are not independent,they are enabled at the
 150                  * same time, even if only one side is running. So, we
 151                  * need to configure both of them at the time when the first
 152                  * stream is opened.
 153                  *
 154                  * CPU DAI:slave mode.
 155                  */
 156                 ret = sport_config_rx(sport_handle, bf5xx_tdm.rcr1,
 157                         bf5xx_tdm.rcr2, 0, 0);
 158                 if (ret) {
 159                         pr_err("SPORT is busy!\n");
 160                         return -EBUSY;
 161                 }
 162
 163                 ret = sport_config_tx(sport_handle, bf5xx_tdm.tcr1,
 164                         bf5xx_tdm.tcr2, 0, 0);
 165                 if (ret) {
 166                         pr_err("SPORT is busy!\n");
 167                         return -EBUSY;
 168                 }
 169
 170                 bf5xx_tdm.configured = 1;
 171         }
 172
 173         return 0;
 174 }
 175
 176 static void bf5xx_tdm_shutdown(struct snd_pcm_substream *substream,
 177         struct snd_soc_dai *dai)
 178 {
 179         /* No active stream, SPORT is allowed to be configured again. */
 180         if (!dai->active)
 181                 bf5xx_tdm.configured = 0;
 182 }
 183
 184 #ifdef CONFIG_PM
 185 static int bf5xx_tdm_suspend(struct snd_soc_dai *dai)
 186 {
 187         struct sport_device *sport =
 188                 (struct sport_device *)dai->private_data;
 189
 190         if (!dai->active)
 191                 return 0;
 192         if (dai->capture.active)
 193                 sport_rx_stop(sport);
 194         if (dai->playback.active)
 195                 sport_tx_stop(sport);
 196         return 0;
 197 }
 198
 199 static int bf5xx_tdm_resume(struct snd_soc_dai *dai)
 200 {
 201         int ret;
 202         struct sport_device *sport =
 203                 (struct sport_device *)dai->private_data;
 204
 205         if (!dai->active)
 206                 return 0;
 207
 208         ret = sport_set_multichannel(sport, 8, 0xFF, 1);
 209         if (ret) {
 210                 pr_err("SPORT is busy!\n");
 211                 ret = -EBUSY;
 212         }
 213
 214         ret = sport_config_rx(sport, IRFS, 0x1F, 0, 0);
 215         if (ret) {
 216                 pr_err("SPORT is busy!\n");
 217                 ret = -EBUSY;
 218         }
 219
 220         ret = sport_config_tx(sport, ITFS, 0x1F, 0, 0);
 221         if (ret) {
 222                 pr_err("SPORT is busy!\n");
 223                 ret = -EBUSY;
 224         }
 225
 226         return 0;
 227 }
 228
 229 #else
 230 #define bf5xx_tdm_suspend      NULL
 231 #define bf5xx_tdm_resume       NULL
 232 #endif
 233
 234 static struct snd_soc_dai_ops bf5xx_tdm_dai_ops = {
 235         .hw_params      = bf5xx_tdm_hw_params,
 236         .set_fmt        = bf5xx_tdm_set_dai_fmt,
 237         .shutdown       = bf5xx_tdm_shutdown,
 238 };
 239
 240 struct snd_soc_dai bf5xx_tdm_dai = {
 241         .name = "bf5xx-tdm",
 242         .id = 0,
 243         .suspend = bf5xx_tdm_suspend,
 244         .resume = bf5xx_tdm_resume,
 245         .playback = {
 246                 .channels_min = 2,
 247                 .channels_max = 8,
 248                 .rates = SNDRV_PCM_RATE_48000,
 249                 .formats = SNDRV_PCM_FMTBIT_S32_LE,},
 250         .capture = {
 251                 .channels_min = 2,
 252                 .channels_max = 8,
 253                 .rates = SNDRV_PCM_RATE_48000,
 254                 .formats = SNDRV_PCM_FMTBIT_S32_LE,},
 255         .ops = &bf5xx_tdm_dai_ops,
 256 };
 257 EXPORT_SYMBOL_GPL(bf5xx_tdm_dai);
 258
 259 static int __devinit bfin_tdm_probe(struct platform_device *pdev)
 260 {
 261         int ret = 0;
 262
 263         if (peripheral_request_list(&sport_req[sport_num][0], "soc-audio")) {
 264                 pr_err("Requesting Peripherals failed\n");
 265                 return -EFAULT;
 266         }
 267
 268         /* request DMA for SPORT */
 269         sport_handle = sport_init(&sport_params[sport_num], 4, \
 270                 8 * sizeof(u32), NULL);
 271         if (!sport_handle) {
 272                 peripheral_free_list(&sport_req[sport_num][0]);
 273                 return -ENODEV;
 274         }
 275
 276         /* SPORT works in TDM mode */
 277         ret = sport_set_multichannel(sport_handle, 8, 0xFF, 1);
 278         if (ret) {
 279                 pr_err("SPORT is busy!\n");
 280                 ret = -EBUSY;
 281                 goto sport_config_err;
 282         }
 283
 284         ret = sport_config_rx(sport_handle, IRFS, 0x1F, 0, 0);
 285         if (ret) {
 286                 pr_err("SPORT is busy!\n");
 287                 ret = -EBUSY;
 288                 goto sport_config_err;
 289         }
 290
 291         ret = sport_config_tx(sport_handle, ITFS, 0x1F, 0, 0);
 292         if (ret) {
 293                 pr_err("SPORT is busy!\n");
 294                 ret = -EBUSY;
 295                 goto sport_config_err;
 296         }
 297
 298         ret = snd_soc_register_dai(&bf5xx_tdm_dai);
 299         if (ret) {
 300                 pr_err("Failed to register DAI: %d\n", ret);
 301                 goto sport_config_err;
 302         }
 303         return 0;
 304
 305 sport_config_err:
 306         peripheral_free_list(&sport_req[sport_num][0]);
 307         return ret;
 308 }
 309
 310 static int __devexit bfin_tdm_remove(struct platform_device *pdev)
 311 {
 312         peripheral_free_list(&sport_req[sport_num][0]);
 313         snd_soc_unregister_dai(&bf5xx_tdm_dai);
 314
 315         return 0;
 316 }
 317
 318 static struct platform_driver bfin_tdm_driver = {
 319         .probe  = bfin_tdm_probe,
 320         .remove = __devexit_p(bfin_tdm_remove),
 321         .driver = {
 322                 .name   = "bfin-tdm",
 323                 .owner  = THIS_MODULE,
 324         },
 325 };
 326
 327 static int __init bfin_tdm_init(void)
 328 {
 329         return platform_driver_register(&bfin_tdm_driver);
 330 }
 331 module_init(bfin_tdm_init);
 332
 333 static void __exit bfin_tdm_exit(void)
 334 {
 335         platform_driver_unregister(&bfin_tdm_driver);
 336 }
 337 module_exit(bfin_tdm_exit);
 338
 339 /* Module information */
 340 MODULE_AUTHOR("Barry Song");
 341 MODULE_DESCRIPTION("TDM driver for ADI Blackfin");
 342 MODULE_LICENSE("GPL");
 343