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
  20 #include <sound/core.h>
  21 #include <sound/pcm.h>
  22 #include <sound/ac97_codec.h>
  23 #include <sound/initval.h>
  24 #include <sound/soc.h>
  25
  26 #include <asm/irq.h>
  27 #include <asm/portmux.h>
  28 #include <linux/mutex.h>
  29 #include <linux/gpio.h>
  30
  31 #include "bf5xx-sport.h"
  32 #include "bf5xx-ac97.h"
  33
  34 /* Anomaly notes:
  35  *  05000250 -  AD1980 is running in TDM mode and RFS/TFS are generated by SPORT
  36  *              contrtoller. But, RFSDIV and TFSDIV are always set to 16*16-1,
  37  *              while the max AC97 data size is 13*16. The DIV is always larger
  38  *              than data size. AD73311 and ad2602 are not running in TDM mode.
  39  *              AD1836 and AD73322 depend on external RFS/TFS only. So, this
  40  *              anomaly does not affect blackfin sound drivers.
  41 */
  42
  43 static int *cmd_count;
  44 static int sport_num = CONFIG_SND_BF5XX_SPORT_NUM;
  45
  46 #define SPORT_REQ(x) \
  47         [x] = {P_SPORT##x##_TFS, P_SPORT##x##_DTPRI, P_SPORT##x##_TSCLK, \
  48                P_SPORT##x##_RFS, P_SPORT##x##_DRPRI, P_SPORT##x##_RSCLK, 0}
  49 static u16 sport_req[][7] = {
  50 #ifdef SPORT0_TCR1
  51         SPORT_REQ(0),
  52 #endif
  53 #ifdef SPORT1_TCR1
  54         SPORT_REQ(1),
  55 #endif
  56 #ifdef SPORT2_TCR1
  57         SPORT_REQ(2),
  58 #endif
  59 #ifdef SPORT3_TCR1
  60         SPORT_REQ(3),
  61 #endif
  62 };
  63
  64 #define SPORT_PARAMS(x) \
  65         [x] = { \
  66                 .dma_rx_chan = CH_SPORT##x##_RX, \
  67                 .dma_tx_chan = CH_SPORT##x##_TX, \
  68                 .err_irq     = IRQ_SPORT##x##_ERROR, \
  69                 .regs        = (struct sport_register *)SPORT##x##_TCR1, \
  70         }
  71 static struct sport_param sport_params[4] = {
  72 #ifdef SPORT0_TCR1
  73         SPORT_PARAMS(0),
  74 #endif
  75 #ifdef SPORT1_TCR1
  76         SPORT_PARAMS(1),
  77 #endif
  78 #ifdef SPORT2_TCR1
  79         SPORT_PARAMS(2),
  80 #endif
  81 #ifdef SPORT3_TCR1
  82         SPORT_PARAMS(3),
  83 #endif
  84 };
  85
  86 void bf5xx_pcm_to_ac97(struct ac97_frame *dst, const __u16 *src,
  87                 size_t count, unsigned int chan_mask)
  88 {
  89         while (count--) {
  90                 dst->ac97_tag = TAG_VALID;
  91                 if (chan_mask & SP_FL) {
  92                         dst->ac97_pcm_r = *src++;
  93                         dst->ac97_tag |= TAG_PCM_RIGHT;
  94                 }
  95                 if (chan_mask & SP_FR) {
  96                         dst->ac97_pcm_l = *src++;
  97                         dst->ac97_tag |= TAG_PCM_LEFT;
  98
  99                 }
 100 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
 101                 if (chan_mask & SP_SR) {
 102                         dst->ac97_sl = *src++;
 103                         dst->ac97_tag |= TAG_PCM_SL;
 104                 }
 105                 if (chan_mask & SP_SL) {
 106                         dst->ac97_sr = *src++;
 107                         dst->ac97_tag |= TAG_PCM_SR;
 108                 }
 109                 if (chan_mask & SP_LFE) {
 110                         dst->ac97_lfe = *src++;
 111                         dst->ac97_tag |= TAG_PCM_LFE;
 112                 }
 113                 if (chan_mask & SP_FC) {
 114                         dst->ac97_center = *src++;
 115                         dst->ac97_tag |= TAG_PCM_CENTER;
 116                 }
 117 #endif
 118                 dst++;
 119         }
 120 }
 121 EXPORT_SYMBOL(bf5xx_pcm_to_ac97);
 122
 123 void bf5xx_ac97_to_pcm(const struct ac97_frame *src, __u16 *dst,
 124                 size_t count)
 125 {
 126         while (count--) {
 127                 *(dst++) = src->ac97_pcm_l;
 128                 *(dst++) = src->ac97_pcm_r;
 129                 src++;
 130         }
 131 }
 132 EXPORT_SYMBOL(bf5xx_ac97_to_pcm);
 133
 134 static unsigned int sport_tx_curr_frag(struct sport_device *sport)
 135 {
 136         return sport->tx_curr_frag = sport_curr_offset_tx(sport) /
 137                         sport->tx_fragsize;
 138 }
 139
 140 static void enqueue_cmd(struct snd_ac97 *ac97, __u16 addr, __u16 data)
 141 {
 142         struct sport_device *sport = sport_handle;
 143         int nextfrag = sport_tx_curr_frag(sport);
 144         struct ac97_frame *nextwrite;
 145
 146         sport_incfrag(sport, &nextfrag, 1);
 147
 148         nextwrite = (struct ac97_frame *)(sport->tx_buf +
 149                         nextfrag * sport->tx_fragsize);
 150         pr_debug("sport->tx_buf:%p, nextfrag:0x%x nextwrite:%p, cmd_count:%d\n",
 151                 sport->tx_buf, nextfrag, nextwrite, cmd_count[nextfrag]);
 152         nextwrite[cmd_count[nextfrag]].ac97_tag |= TAG_CMD;
 153         nextwrite[cmd_count[nextfrag]].ac97_addr = addr;
 154         nextwrite[cmd_count[nextfrag]].ac97_data = data;
 155         ++cmd_count[nextfrag];
 156         pr_debug("ac97_sport: Inserting %02x/%04x into fragment %d\n",
 157                         addr >> 8, data, nextfrag);
 158 }
 159
 160 static unsigned short bf5xx_ac97_read(struct snd_ac97 *ac97,
 161         unsigned short reg)
 162 {
 163         struct ac97_frame out_frame[2], in_frame[2];
 164
 165         pr_debug("%s enter 0x%x\n", __func__, reg);
 166
 167         /* When dma descriptor is enabled, the register should not be read */
 168         if (sport_handle->tx_run || sport_handle->rx_run) {
 169                 pr_err("Could you send a mail to cliff.cai@analog.com "
 170                                 "to report this?\n");
 171                 return -EFAULT;
 172         }
 173
 174         memset(&out_frame, 0, 2 * sizeof(struct ac97_frame));
 175         memset(&in_frame, 0, 2 * sizeof(struct ac97_frame));
 176         out_frame[0].ac97_tag = TAG_VALID | TAG_CMD;
 177         out_frame[0].ac97_addr = ((reg << 8) | 0x8000);
 178         sport_send_and_recv(sport_handle, (unsigned char *)&out_frame,
 179                         (unsigned char *)&in_frame,
 180                         2 * sizeof(struct ac97_frame));
 181         return in_frame[1].ac97_data;
 182 }
 183
 184 void bf5xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 185         unsigned short val)
 186 {
 187         pr_debug("%s enter 0x%x:0x%04x\n", __func__, reg, val);
 188
 189         if (sport_handle->tx_run) {
 190                 enqueue_cmd(ac97, (reg << 8), val); /* write */
 191                 enqueue_cmd(ac97, (reg << 8) | 0x8000, 0); /* read back */
 192         } else {
 193                 struct ac97_frame frame;
 194                 memset(&frame, 0, sizeof(struct ac97_frame));
 195                 frame.ac97_tag = TAG_VALID | TAG_CMD;
 196                 frame.ac97_addr = (reg << 8);
 197                 frame.ac97_data = val;
 198                 sport_send_and_recv(sport_handle, (unsigned char *)&frame, \
 199                                 NULL, sizeof(struct ac97_frame));
 200         }
 201 }
 202
 203 static void bf5xx_ac97_warm_reset(struct snd_ac97 *ac97)
 204 {
 205 #if defined(CONFIG_BF54x) || defined(CONFIG_BF561) || \
 206  (defined(BF537_FAMILY) && (CONFIG_SND_BF5XX_SPORT_NUM == 1))
 207
 208 #define CONCAT(a, b, c) a ## b ## c
 209 #define BFIN_SPORT_RFS(x) CONCAT(P_SPORT, x, _RFS)
 210
 211         u16 per = BFIN_SPORT_RFS(CONFIG_SND_BF5XX_SPORT_NUM);
 212         u16 gpio = P_IDENT(BFIN_SPORT_RFS(CONFIG_SND_BF5XX_SPORT_NUM));
 213
 214         pr_debug("%s enter\n", __func__);
 215
 216         peripheral_free(per);
 217         gpio_request(gpio, "bf5xx-ac97");
 218         gpio_direction_output(gpio, 1);
 219         udelay(2);
 220         gpio_set_value(gpio, 0);
 221         udelay(1);
 222         gpio_free(gpio);
 223         peripheral_request(per, "soc-audio");
 224 #else
 225         pr_info("%s: Not implemented\n", __func__);
 226 #endif
 227 }
 228
 229 static void bf5xx_ac97_cold_reset(struct snd_ac97 *ac97)
 230 {
 231 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 232         pr_debug("%s enter\n", __func__);
 233
 234         /* It is specified for bf548-ezkit */
 235         gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 0);
 236         /* Keep reset pin low for 1 ms */
 237         mdelay(1);
 238         gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
 239         /* Wait for bit clock recover */
 240         mdelay(1);
 241 #else
 242         pr_info("%s: Not implemented\n", __func__);
 243 #endif
 244 }
 245
 246 struct snd_ac97_bus_ops soc_ac97_ops = {
 247         .read   = bf5xx_ac97_read,
 248         .write  = bf5xx_ac97_write,
 249         .warm_reset     = bf5xx_ac97_warm_reset,
 250         .reset  = bf5xx_ac97_cold_reset,
 251 };
 252 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 253
 254 #ifdef CONFIG_PM
 255 static int bf5xx_ac97_suspend(struct snd_soc_dai *dai)
 256 {
 257         struct sport_device *sport =
 258                 (struct sport_device *)dai->private_data;
 259
 260         pr_debug("%s : sport %d\n", __func__, dai->id);
 261         if (!dai->active)
 262                 return 0;
 263         if (dai->capture.active)
 264                 sport_rx_stop(sport);
 265         if (dai->playback.active)
 266                 sport_tx_stop(sport);
 267         return 0;
 268 }
 269
 270 static int bf5xx_ac97_resume(struct snd_soc_dai *dai)
 271 {
 272         int ret;
 273         struct sport_device *sport =
 274                 (struct sport_device *)dai->private_data;
 275
 276         pr_debug("%s : sport %d\n", __func__, dai->id);
 277         if (!dai->active)
 278                 return 0;
 279
 280         ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1);
 281         if (ret) {
 282                 pr_err("SPORT is busy!\n");
 283                 return -EBUSY;
 284         }
 285
 286         ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1));
 287         if (ret) {
 288                 pr_err("SPORT is busy!\n");
 289                 return -EBUSY;
 290         }
 291
 292         ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1));
 293         if (ret) {
 294                 pr_err("SPORT is busy!\n");
 295                 return -EBUSY;
 296         }
 297
 298         if (dai->capture.active)
 299                 sport_rx_start(sport);
 300         if (dai->playback.active)
 301                 sport_tx_start(sport);
 302         return 0;
 303 }
 304
 305 #else
 306 #define bf5xx_ac97_suspend      NULL
 307 #define bf5xx_ac97_resume       NULL
 308 #endif
 309
 310 static int bf5xx_ac97_probe(struct platform_device *pdev,
 311                             struct snd_soc_dai *dai)
 312 {
 313         int ret = 0;
 314         cmd_count = (int *)get_zeroed_page(GFP_KERNEL);
 315         if (cmd_count == NULL)
 316                 return -ENOMEM;
 317
 318         if (peripheral_request_list(sport_req[sport_num], "soc-audio")) {
 319                 pr_err("Requesting Peripherals failed\n");
 320                 ret =  -EFAULT;
 321                 goto peripheral_err;
 322         }
 323
 324 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 325         /* Request PB3 as reset pin */
 326         if (gpio_request(CONFIG_SND_BF5XX_RESET_GPIO_NUM, "SND_AD198x RESET")) {
 327                 pr_err("Failed to request GPIO_%d for reset\n",
 328                                 CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 329                 ret =  -1;
 330                 goto gpio_err;
 331         }
 332         gpio_direction_output(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
 333 #endif
 334         sport_handle = sport_init(&sport_params[sport_num], 2, \
 335                         sizeof(struct ac97_frame), NULL);
 336         if (!sport_handle) {
 337                 ret = -ENODEV;
 338                 goto sport_err;
 339         }
 340         /*SPORT works in TDM mode to simulate AC97 transfers*/
 341         ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1);
 342         if (ret) {
 343                 pr_err("SPORT is busy!\n");
 344                 ret = -EBUSY;
 345                 goto sport_config_err;
 346         }
 347
 348         ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1));
 349         if (ret) {
 350                 pr_err("SPORT is busy!\n");
 351                 ret = -EBUSY;
 352                 goto sport_config_err;
 353         }
 354
 355         ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1));
 356         if (ret) {
 357                 pr_err("SPORT is busy!\n");
 358                 ret = -EBUSY;
 359                 goto sport_config_err;
 360         }
 361
 362         return 0;
 363
 364 sport_config_err:
 365         kfree(sport_handle);
 366 sport_err:
 367 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 368         gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 369 gpio_err:
 370 #endif
 371         peripheral_free_list(sport_req[sport_num]);
 372 peripheral_err:
 373         free_page((unsigned long)cmd_count);
 374         cmd_count = NULL;
 375
 376         return ret;
 377 }
 378
 379 static void bf5xx_ac97_remove(struct platform_device *pdev,
 380                               struct snd_soc_dai *dai)
 381 {
 382         free_page((unsigned long)cmd_count);
 383         cmd_count = NULL;
 384         peripheral_free_list(sport_req[sport_num]);
 385 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 386         gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 387 #endif
 388 }
 389
 390 struct snd_soc_dai bfin_ac97_dai = {
 391         .name = "bf5xx-ac97",
 392         .id = 0,
 393         .ac97_control = 1,
 394         .probe = bf5xx_ac97_probe,
 395         .remove = bf5xx_ac97_remove,
 396         .suspend = bf5xx_ac97_suspend,
 397         .resume = bf5xx_ac97_resume,
 398         .playback = {
 399                 .stream_name = "AC97 Playback",
 400                 .channels_min = 2,
 401 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
 402                 .channels_max = 6,
 403 #else
 404                 .channels_max = 2,
 405 #endif
 406                 .rates = SNDRV_PCM_RATE_48000,
 407                 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
 408         .capture = {
 409                 .stream_name = "AC97 Capture",
 410                 .channels_min = 2,
 411                 .channels_max = 2,
 412                 .rates = SNDRV_PCM_RATE_48000,
 413                 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
 414 };
 415 EXPORT_SYMBOL_GPL(bfin_ac97_dai);
 416
 417 static int __init bfin_ac97_init(void)
 418 {
 419         return snd_soc_register_dai(&bfin_ac97_dai);
 420 }
 421 module_init(bfin_ac97_init);
 422
 423 static void __exit bfin_ac97_exit(void)
 424 {
 425         snd_soc_unregister_dai(&bfin_ac97_dai);
 426 }
 427 module_exit(bfin_ac97_exit);
 428
 429 MODULE_AUTHOR("Roy Huang");
 430 MODULE_DESCRIPTION("AC97 driver for ADI Blackfin");
 431 MODULE_LICENSE("GPL");