sound/soc/blackfin/bf5xx-ac97.c

   1 /*
   2  * bf5xx-ac97.c -- AC97 support for the ADI blackfin chip.
   3  *
   4  * Author:      Roy Huang
   5  * Created:     11th. June 2007
   6  * Copyright:   Analog Device Inc.
   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 version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/wait.h>
  18 #include <linux/delay.h>
  19 #include <linux/slab.h>
  20
  21 #include <sound/core.h>
  22 #include <sound/pcm.h>
  23 #include <sound/ac97_codec.h>
  24 #include <sound/initval.h>
  25 #include <sound/soc.h>
  26
  27 #include <asm/irq.h>
  28 #include <asm/portmux.h>
  29 #include <linux/mutex.h>
  30 #include <linux/gpio.h>
  31
  32 #include "bf5xx-sport.h"
  33 #include "bf5xx-ac97.h"
  34
  35 /* Anomaly notes:
  36  *  05000250 -  AD1980 is running in TDM mode and RFS/TFS are generated by SPORT
  37  *              contrtoller. But, RFSDIV and TFSDIV are always set to 16*16-1,
  38  *              while the max AC97 data size is 13*16. The DIV is always larger
  39  *              than data size. AD73311 and ad2602 are not running in TDM mode.
  40  *              AD1836 and AD73322 depend on external RFS/TFS only. So, this
  41  *              anomaly does not affect blackfin sound drivers.
  42 */
  43
  44 static struct sport_device *ac97_sport_handle;
  45
  46 void bf5xx_pcm_to_ac97(struct ac97_frame *dst, const __u16 *src,
  47                 size_t count, unsigned int chan_mask)
  48 {
  49         while (count--) {
  50                 dst->ac97_tag = TAG_VALID;
  51                 if (chan_mask & SP_FL) {
  52                         dst->ac97_pcm_r = *src++;
  53                         dst->ac97_tag |= TAG_PCM_RIGHT;
  54                 }
  55                 if (chan_mask & SP_FR) {
  56                         dst->ac97_pcm_l = *src++;
  57                         dst->ac97_tag |= TAG_PCM_LEFT;
  58
  59                 }
  60 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
  61                 if (chan_mask & SP_SR) {
  62                         dst->ac97_sl = *src++;
  63                         dst->ac97_tag |= TAG_PCM_SL;
  64                 }
  65                 if (chan_mask & SP_SL) {
  66                         dst->ac97_sr = *src++;
  67                         dst->ac97_tag |= TAG_PCM_SR;
  68                 }
  69                 if (chan_mask & SP_LFE) {
  70                         dst->ac97_lfe = *src++;
  71                         dst->ac97_tag |= TAG_PCM_LFE;
  72                 }
  73                 if (chan_mask & SP_FC) {
  74                         dst->ac97_center = *src++;
  75                         dst->ac97_tag |= TAG_PCM_CENTER;
  76                 }
  77 #endif
  78                 dst++;
  79         }
  80 }
  81 EXPORT_SYMBOL(bf5xx_pcm_to_ac97);
  82
  83 void bf5xx_ac97_to_pcm(const struct ac97_frame *src, __u16 *dst,
  84                 size_t count)
  85 {
  86         while (count--) {
  87                 *(dst++) = src->ac97_pcm_l;
  88                 *(dst++) = src->ac97_pcm_r;
  89                 src++;
  90         }
  91 }
  92 EXPORT_SYMBOL(bf5xx_ac97_to_pcm);
  93
  94 static unsigned int sport_tx_curr_frag(struct sport_device *sport)
  95 {
  96         return sport->tx_curr_frag = sport_curr_offset_tx(sport) /
  97                         sport->tx_fragsize;
  98 }
  99
 100 static void enqueue_cmd(struct snd_ac97 *ac97, __u16 addr, __u16 data)
 101 {
 102         struct sport_device *sport = ac97_sport_handle;
 103         int *cmd_count = sport->private_data;
 104         int nextfrag = sport_tx_curr_frag(sport);
 105         struct ac97_frame *nextwrite;
 106
 107         sport_incfrag(sport, &nextfrag, 1);
 108
 109         nextwrite = (struct ac97_frame *)(sport->tx_buf +
 110                         nextfrag * sport->tx_fragsize);
 111         pr_debug("sport->tx_buf:%p, nextfrag:0x%x nextwrite:%p, cmd_count:%d\n",
 112                 sport->tx_buf, nextfrag, nextwrite, cmd_count[nextfrag]);
 113         nextwrite[cmd_count[nextfrag]].ac97_tag |= TAG_CMD;
 114         nextwrite[cmd_count[nextfrag]].ac97_addr = addr;
 115         nextwrite[cmd_count[nextfrag]].ac97_data = data;
 116         ++cmd_count[nextfrag];
 117         pr_debug("ac97_sport: Inserting %02x/%04x into fragment %d\n",
 118                         addr >> 8, data, nextfrag);
 119 }
 120
 121 static unsigned short bf5xx_ac97_read(struct snd_ac97 *ac97,
 122         unsigned short reg)
 123 {
 124         struct sport_device *sport_handle = ac97_sport_handle;
 125         struct ac97_frame out_frame[2], in_frame[2];
 126
 127         pr_debug("%s enter 0x%x\n", __func__, reg);
 128
 129         /* When dma descriptor is enabled, the register should not be read */
 130         if (sport_handle->tx_run || sport_handle->rx_run) {
 131                 pr_err("Could you send a mail to cliff.cai@analog.com "
 132                                 "to report this?\n");
 133                 return -EFAULT;
 134         }
 135
 136         memset(&out_frame, 0, 2 * sizeof(struct ac97_frame));
 137         memset(&in_frame, 0, 2 * sizeof(struct ac97_frame));
 138         out_frame[0].ac97_tag = TAG_VALID | TAG_CMD;
 139         out_frame[0].ac97_addr = ((reg << 8) | 0x8000);
 140         sport_send_and_recv(sport_handle, (unsigned char *)&out_frame,
 141                         (unsigned char *)&in_frame,
 142                         2 * sizeof(struct ac97_frame));
 143         return in_frame[1].ac97_data;
 144 }
 145
 146 void bf5xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 147         unsigned short val)
 148 {
 149         struct sport_device *sport_handle = ac97_sport_handle;
 150
 151         pr_debug("%s enter 0x%x:0x%04x\n", __func__, reg, val);
 152
 153         if (sport_handle->tx_run) {
 154                 enqueue_cmd(ac97, (reg << 8), val); /* write */
 155                 enqueue_cmd(ac97, (reg << 8) | 0x8000, 0); /* read back */
 156         } else {
 157                 struct ac97_frame frame;
 158                 memset(&frame, 0, sizeof(struct ac97_frame));
 159                 frame.ac97_tag = TAG_VALID | TAG_CMD;
 160                 frame.ac97_addr = (reg << 8);
 161                 frame.ac97_data = val;
 162                 sport_send_and_recv(sport_handle, (unsigned char *)&frame, \
 163                                 NULL, sizeof(struct ac97_frame));
 164         }
 165 }
 166
 167 static void bf5xx_ac97_warm_reset(struct snd_ac97 *ac97)
 168 {
 169         struct sport_device *sport_handle = ac97_sport_handle;
 170         u16 gpio = P_IDENT(sport_handle->pin_req[3]);
 171
 172         pr_debug("%s enter\n", __func__);
 173
 174         peripheral_free_list(sport_handle->pin_req);
 175         gpio_request(gpio, "bf5xx-ac97");
 176         gpio_direction_output(gpio, 1);
 177         udelay(2);
 178         gpio_set_value(gpio, 0);
 179         udelay(1);
 180         gpio_free(gpio);
 181         peripheral_request_list(sport_handle->pin_req, "soc-audio");
 182 }
 183
 184 static void bf5xx_ac97_cold_reset(struct snd_ac97 *ac97)
 185 {
 186 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 187         pr_debug("%s enter\n", __func__);
 188
 189         /* It is specified for bf548-ezkit */
 190         gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 0);
 191         /* Keep reset pin low for 1 ms */
 192         mdelay(1);
 193         gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
 194         /* Wait for bit clock recover */
 195         mdelay(1);
 196 #else
 197         pr_info("%s: Not implemented\n", __func__);
 198 #endif
 199 }
 200
 201 struct snd_ac97_bus_ops soc_ac97_ops = {
 202         .read   = bf5xx_ac97_read,
 203         .write  = bf5xx_ac97_write,
 204         .warm_reset     = bf5xx_ac97_warm_reset,
 205         .reset  = bf5xx_ac97_cold_reset,
 206 };
 207 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 208
 209 #ifdef CONFIG_PM
 210 static int bf5xx_ac97_suspend(struct snd_soc_dai *dai)
 211 {
 212         struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
 213
 214         pr_debug("%s : sport %d\n", __func__, dai->id);
 215         if (!dai->active)
 216                 return 0;
 217         if (dai->capture_active)
 218                 sport_rx_stop(sport);
 219         if (dai->playback_active)
 220                 sport_tx_stop(sport);
 221         return 0;
 222 }
 223
 224 static int bf5xx_ac97_resume(struct snd_soc_dai *dai)
 225 {
 226         int ret;
 227         struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
 228
 229         pr_debug("%s : sport %d\n", __func__, dai->id);
 230         if (!dai->active)
 231                 return 0;
 232
 233 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
 234         ret = sport_set_multichannel(sport, 16, 0x3FF, 1);
 235 #else
 236         ret = sport_set_multichannel(sport, 16, 0x1F, 1);
 237 #endif
 238         if (ret) {
 239                 pr_err("SPORT is busy!\n");
 240                 return -EBUSY;
 241         }
 242
 243         ret = sport_config_rx(sport, IRFS, 0xF, 0, (16*16-1));
 244         if (ret) {
 245                 pr_err("SPORT is busy!\n");
 246                 return -EBUSY;
 247         }
 248
 249         ret = sport_config_tx(sport, ITFS, 0xF, 0, (16*16-1));
 250         if (ret) {
 251                 pr_err("SPORT is busy!\n");
 252                 return -EBUSY;
 253         }
 254
 255         return 0;
 256 }
 257
 258 #else
 259 #define bf5xx_ac97_suspend      NULL
 260 #define bf5xx_ac97_resume       NULL
 261 #endif
 262
 263 static struct snd_soc_dai_driver bfin_ac97_dai = {
 264         .ac97_control = 1,
 265         .suspend = bf5xx_ac97_suspend,
 266         .resume = bf5xx_ac97_resume,
 267         .playback = {
 268                 .stream_name = "AC97 Playback",
 269                 .channels_min = 2,
 270 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
 271                 .channels_max = 6,
 272 #else
 273                 .channels_max = 2,
 274 #endif
 275                 .rates = SNDRV_PCM_RATE_48000,
 276                 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
 277         .capture = {
 278                 .stream_name = "AC97 Capture",
 279                 .channels_min = 2,
 280                 .channels_max = 2,
 281                 .rates = SNDRV_PCM_RATE_48000,
 282                 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
 283 };
 284
 285 static int asoc_bfin_ac97_probe(struct platform_device *pdev)
 286 {
 287         struct sport_device *sport_handle;
 288         int ret;
 289
 290 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 291         /* Request PB3 as reset pin */
 292         if (gpio_request(CONFIG_SND_BF5XX_RESET_GPIO_NUM, "SND_AD198x RESET")) {
 293                 pr_err("Failed to request GPIO_%d for reset\n",
 294                                 CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 295                 ret =  -1;
 296                 goto gpio_err;
 297         }
 298         gpio_direction_output(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
 299 #endif
 300
 301         sport_handle = sport_init(pdev, 2, sizeof(struct ac97_frame),
 302                 PAGE_SIZE);
 303         if (!sport_handle) {
 304                 ret = -ENODEV;
 305                 goto sport_err;
 306         }
 307
 308         /*SPORT works in TDM mode to simulate AC97 transfers*/
 309 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
 310         ret = sport_set_multichannel(sport_handle, 16, 0x3FF, 1);
 311 #else
 312         ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1);
 313 #endif
 314         if (ret) {
 315                 pr_err("SPORT is busy!\n");
 316                 ret = -EBUSY;
 317                 goto sport_config_err;
 318         }
 319
 320         ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1));
 321         if (ret) {
 322                 pr_err("SPORT is busy!\n");
 323                 ret = -EBUSY;
 324                 goto sport_config_err;
 325         }
 326
 327         ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1));
 328         if (ret) {
 329                 pr_err("SPORT is busy!\n");
 330                 ret = -EBUSY;
 331                 goto sport_config_err;
 332         }
 333
 334         ret = snd_soc_register_dai(&pdev->dev, &bfin_ac97_dai);
 335         if (ret) {
 336                 pr_err("Failed to register DAI: %d\n", ret);
 337                 goto sport_config_err;
 338         }
 339
 340         ac97_sport_handle = sport_handle;
 341
 342         return 0;
 343
 344 sport_config_err:
 345         sport_done(sport_handle);
 346 sport_err:
 347 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 348         gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 349 gpio_err:
 350 #endif
 351
 352         return ret;
 353 }
 354
 355 static int asoc_bfin_ac97_remove(struct platform_device *pdev)
 356 {
 357         struct sport_device *sport_handle = platform_get_drvdata(pdev);
 358
 359         snd_soc_unregister_dai(&pdev->dev);
 360         sport_done(sport_handle);
 361 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 362         gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 363 #endif
 364
 365         return 0;
 366 }
 367
 368 static struct platform_driver asoc_bfin_ac97_driver = {
 369         .driver = {
 370                         .name = "bfin-ac97",
 371                         .owner = THIS_MODULE,
 372         },
 373
 374         .probe = asoc_bfin_ac97_probe,
 375         .remove = asoc_bfin_ac97_remove,
 376 };
 377
 378 module_platform_driver(asoc_bfin_ac97_driver);
 379
 380 MODULE_AUTHOR("Roy Huang");
 381 MODULE_DESCRIPTION("AC97 driver for ADI Blackfin");
 382 MODULE_LICENSE("GPL");