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