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 #if defined(CONFIG_BF54x)
  35 #define PIN_REQ_SPORT_0 {P_SPORT0_TFS, P_SPORT0_DTPRI, P_SPORT0_TSCLK, \
  36                 P_SPORT0_RFS, P_SPORT0_DRPRI, P_SPORT0_RSCLK, 0}
  37
  38 #define PIN_REQ_SPORT_1 {P_SPORT1_TFS, P_SPORT1_DTPRI, P_SPORT1_TSCLK, \
  39                 P_SPORT1_RFS, P_SPORT1_DRPRI, P_SPORT1_RSCLK, 0}
  40
  41 #define PIN_REQ_SPORT_2 {P_SPORT2_TFS, P_SPORT2_DTPRI, P_SPORT2_TSCLK, \
  42                 P_SPORT2_RFS, P_SPORT2_DRPRI, P_SPORT2_RSCLK, 0}
  43
  44 #define PIN_REQ_SPORT_3 {P_SPORT3_TFS, P_SPORT3_DTPRI, P_SPORT3_TSCLK, \
  45                 P_SPORT3_RFS, P_SPORT3_DRPRI, P_SPORT3_RSCLK, 0}
  46 #else
  47 #define PIN_REQ_SPORT_0 {P_SPORT0_DTPRI, P_SPORT0_TSCLK, P_SPORT0_RFS, \
  48                  P_SPORT0_DRPRI, P_SPORT0_RSCLK, 0}
  49
  50 #define PIN_REQ_SPORT_1 {P_SPORT1_DTPRI, P_SPORT1_TSCLK, P_SPORT1_RFS, \
  51                  P_SPORT1_DRPRI, P_SPORT1_RSCLK, 0}
  52 #endif
  53
  54 static int *cmd_count;
  55 static int sport_num = CONFIG_SND_BF5XX_SPORT_NUM;
  56
  57 static u16 sport_req[][7] = {
  58                 PIN_REQ_SPORT_0,
  59 #ifdef PIN_REQ_SPORT_1
  60                 PIN_REQ_SPORT_1,
  61 #endif
  62 #ifdef PIN_REQ_SPORT_2
  63                 PIN_REQ_SPORT_2,
  64 #endif
  65 #ifdef PIN_REQ_SPORT_3
  66                 PIN_REQ_SPORT_3,
  67 #endif
  68         };
  69
  70 static struct sport_param sport_params[4] = {
  71         {
  72                 .dma_rx_chan    = CH_SPORT0_RX,
  73                 .dma_tx_chan    = CH_SPORT0_TX,
  74                 .err_irq        = IRQ_SPORT0_ERROR,
  75                 .regs           = (struct sport_register *)SPORT0_TCR1,
  76         },
  77 #ifdef PIN_REQ_SPORT_1
  78         {
  79                 .dma_rx_chan    = CH_SPORT1_RX,
  80                 .dma_tx_chan    = CH_SPORT1_TX,
  81                 .err_irq        = IRQ_SPORT1_ERROR,
  82                 .regs           = (struct sport_register *)SPORT1_TCR1,
  83         },
  84 #endif
  85 #ifdef PIN_REQ_SPORT_2
  86         {
  87                 .dma_rx_chan    = CH_SPORT2_RX,
  88                 .dma_tx_chan    = CH_SPORT2_TX,
  89                 .err_irq        = IRQ_SPORT2_ERROR,
  90                 .regs           = (struct sport_register *)SPORT2_TCR1,
  91         },
  92 #endif
  93 #ifdef PIN_REQ_SPORT_3
  94         {
  95                 .dma_rx_chan    = CH_SPORT3_RX,
  96                 .dma_tx_chan    = CH_SPORT3_TX,
  97                 .err_irq        = IRQ_SPORT3_ERROR,
  98                 .regs           = (struct sport_register *)SPORT3_TCR1,
  99         }
 100 #endif
 101 };
 102
 103 void bf5xx_pcm_to_ac97(struct ac97_frame *dst, const __u16 *src,
 104                 size_t count, unsigned int chan_mask)
 105 {
 106         while (count--) {
 107                 dst->ac97_tag = TAG_VALID;
 108                 if (chan_mask & SP_FL) {
 109                         dst->ac97_pcm_r = *src++;
 110                         dst->ac97_tag |= TAG_PCM_RIGHT;
 111                 }
 112                 if (chan_mask & SP_FR) {
 113                         dst->ac97_pcm_l = *src++;
 114                         dst->ac97_tag |= TAG_PCM_LEFT;
 115
 116                 }
 117 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
 118                 if (chan_mask & SP_SR) {
 119                         dst->ac97_sl = *src++;
 120                         dst->ac97_tag |= TAG_PCM_SL;
 121                 }
 122                 if (chan_mask & SP_SL) {
 123                         dst->ac97_sr = *src++;
 124                         dst->ac97_tag |= TAG_PCM_SR;
 125                 }
 126                 if (chan_mask & SP_LFE) {
 127                         dst->ac97_lfe = *src++;
 128                         dst->ac97_tag |= TAG_PCM_LFE;
 129                 }
 130                 if (chan_mask & SP_FC) {
 131                         dst->ac97_center = *src++;
 132                         dst->ac97_tag |= TAG_PCM_CENTER;
 133                 }
 134 #endif
 135                 dst++;
 136         }
 137 }
 138 EXPORT_SYMBOL(bf5xx_pcm_to_ac97);
 139
 140 void bf5xx_ac97_to_pcm(const struct ac97_frame *src, __u16 *dst,
 141                 size_t count)
 142 {
 143         while (count--) {
 144                 *(dst++) = src->ac97_pcm_l;
 145                 *(dst++) = src->ac97_pcm_r;
 146                 src++;
 147         }
 148 }
 149 EXPORT_SYMBOL(bf5xx_ac97_to_pcm);
 150
 151 static unsigned int sport_tx_curr_frag(struct sport_device *sport)
 152 {
 153         return sport->tx_curr_frag = sport_curr_offset_tx(sport) /
 154                         sport->tx_fragsize;
 155 }
 156
 157 static void enqueue_cmd(struct snd_ac97 *ac97, __u16 addr, __u16 data)
 158 {
 159         struct sport_device *sport = sport_handle;
 160         int nextfrag = sport_tx_curr_frag(sport);
 161         struct ac97_frame *nextwrite;
 162
 163         sport_incfrag(sport, &nextfrag, 1);
 164
 165         nextwrite = (struct ac97_frame *)(sport->tx_buf +
 166                         nextfrag * sport->tx_fragsize);
 167         pr_debug("sport->tx_buf:%p, nextfrag:0x%x nextwrite:%p, cmd_count:%d\n",
 168                 sport->tx_buf, nextfrag, nextwrite, cmd_count[nextfrag]);
 169         nextwrite[cmd_count[nextfrag]].ac97_tag |= TAG_CMD;
 170         nextwrite[cmd_count[nextfrag]].ac97_addr = addr;
 171         nextwrite[cmd_count[nextfrag]].ac97_data = data;
 172         ++cmd_count[nextfrag];
 173         pr_debug("ac97_sport: Inserting %02x/%04x into fragment %d\n",
 174                         addr >> 8, data, nextfrag);
 175 }
 176
 177 static unsigned short bf5xx_ac97_read(struct snd_ac97 *ac97,
 178         unsigned short reg)
 179 {
 180         struct ac97_frame out_frame[2], in_frame[2];
 181
 182         pr_debug("%s enter 0x%x\n", __func__, reg);
 183
 184         /* When dma descriptor is enabled, the register should not be read */
 185         if (sport_handle->tx_run || sport_handle->rx_run) {
 186                 pr_err("Could you send a mail to cliff.cai@analog.com "
 187                                 "to report this?\n");
 188                 return -EFAULT;
 189         }
 190
 191         memset(&out_frame, 0, 2 * sizeof(struct ac97_frame));
 192         memset(&in_frame, 0, 2 * sizeof(struct ac97_frame));
 193         out_frame[0].ac97_tag = TAG_VALID | TAG_CMD;
 194         out_frame[0].ac97_addr = ((reg << 8) | 0x8000);
 195         sport_send_and_recv(sport_handle, (unsigned char *)&out_frame,
 196                         (unsigned char *)&in_frame,
 197                         2 * sizeof(struct ac97_frame));
 198         return in_frame[1].ac97_data;
 199 }
 200
 201 void bf5xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 202         unsigned short val)
 203 {
 204         pr_debug("%s enter 0x%x:0x%04x\n", __func__, reg, val);
 205
 206         if (sport_handle->tx_run) {
 207                 enqueue_cmd(ac97, (reg << 8), val); /* write */
 208                 enqueue_cmd(ac97, (reg << 8) | 0x8000, 0); /* read back */
 209         } else {
 210                 struct ac97_frame frame;
 211                 memset(&frame, 0, sizeof(struct ac97_frame));
 212                 frame.ac97_tag = TAG_VALID | TAG_CMD;
 213                 frame.ac97_addr = (reg << 8);
 214                 frame.ac97_data = val;
 215                 sport_send_and_recv(sport_handle, (unsigned char *)&frame, \
 216                                 NULL, sizeof(struct ac97_frame));
 217         }
 218 }
 219
 220 static void bf5xx_ac97_warm_reset(struct snd_ac97 *ac97)
 221 {
 222 #if defined(CONFIG_BF54x) || defined(CONFIG_BF561) || \
 223  (defined(BF537_FAMILY) && (CONFIG_SND_BF5XX_SPORT_NUM == 1))
 224
 225 #define CONCAT(a, b, c) a ## b ## c
 226 #define BFIN_SPORT_RFS(x) CONCAT(P_SPORT, x, _RFS)
 227
 228         u16 per = BFIN_SPORT_RFS(CONFIG_SND_BF5XX_SPORT_NUM);
 229         u16 gpio = P_IDENT(BFIN_SPORT_RFS(CONFIG_SND_BF5XX_SPORT_NUM));
 230
 231         pr_debug("%s enter\n", __func__);
 232
 233         peripheral_free(per);
 234         gpio_request(gpio, "bf5xx-ac97");
 235         gpio_direction_output(gpio, 1);
 236         udelay(2);
 237         gpio_set_value(gpio, 0);
 238         udelay(1);
 239         gpio_free(gpio);
 240         peripheral_request(per, "soc-audio");
 241 #else
 242         pr_info("%s: Not implemented\n", __func__);
 243 #endif
 244 }
 245
 246 static void bf5xx_ac97_cold_reset(struct snd_ac97 *ac97)
 247 {
 248 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 249         pr_debug("%s enter\n", __func__);
 250
 251         /* It is specified for bf548-ezkit */
 252         gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 0);
 253         /* Keep reset pin low for 1 ms */
 254         mdelay(1);
 255         gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
 256         /* Wait for bit clock recover */
 257         mdelay(1);
 258 #else
 259         pr_info("%s: Not implemented\n", __func__);
 260 #endif
 261 }
 262
 263 struct snd_ac97_bus_ops soc_ac97_ops = {
 264         .read   = bf5xx_ac97_read,
 265         .write  = bf5xx_ac97_write,
 266         .warm_reset     = bf5xx_ac97_warm_reset,
 267         .reset  = bf5xx_ac97_cold_reset,
 268 };
 269 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 270
 271 #ifdef CONFIG_PM
 272 static int bf5xx_ac97_suspend(struct snd_soc_dai *dai)
 273 {
 274         struct sport_device *sport =
 275                 (struct sport_device *)dai->private_data;
 276
 277         pr_debug("%s : sport %d\n", __func__, dai->id);
 278         if (!dai->active)
 279                 return 0;
 280         if (dai->capture.active)
 281                 sport_rx_stop(sport);
 282         if (dai->playback.active)
 283                 sport_tx_stop(sport);
 284         return 0;
 285 }
 286
 287 static int bf5xx_ac97_resume(struct snd_soc_dai *dai)
 288 {
 289         int ret;
 290         struct sport_device *sport =
 291                 (struct sport_device *)dai->private_data;
 292
 293         pr_debug("%s : sport %d\n", __func__, dai->id);
 294         if (!dai->active)
 295                 return 0;
 296
 297         ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1);
 298         if (ret) {
 299                 pr_err("SPORT is busy!\n");
 300                 return -EBUSY;
 301         }
 302
 303         ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1));
 304         if (ret) {
 305                 pr_err("SPORT is busy!\n");
 306                 return -EBUSY;
 307         }
 308
 309         ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1));
 310         if (ret) {
 311                 pr_err("SPORT is busy!\n");
 312                 return -EBUSY;
 313         }
 314
 315         if (dai->capture.active)
 316                 sport_rx_start(sport);
 317         if (dai->playback.active)
 318                 sport_tx_start(sport);
 319         return 0;
 320 }
 321
 322 #else
 323 #define bf5xx_ac97_suspend      NULL
 324 #define bf5xx_ac97_resume       NULL
 325 #endif
 326
 327 static int bf5xx_ac97_probe(struct platform_device *pdev,
 328                             struct snd_soc_dai *dai)
 329 {
 330         int ret = 0;
 331         cmd_count = (int *)get_zeroed_page(GFP_KERNEL);
 332         if (cmd_count == NULL)
 333                 return -ENOMEM;
 334
 335         if (peripheral_request_list(&sport_req[sport_num][0], "soc-audio")) {
 336                 pr_err("Requesting Peripherals failed\n");
 337                 ret =  -EFAULT;
 338                 goto peripheral_err;
 339                 }
 340
 341 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 342         /* Request PB3 as reset pin */
 343         if (gpio_request(CONFIG_SND_BF5XX_RESET_GPIO_NUM, "SND_AD198x RESET")) {
 344                 pr_err("Failed to request GPIO_%d for reset\n",
 345                                 CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 346                 ret =  -1;
 347                 goto gpio_err;
 348         }
 349         gpio_direction_output(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
 350 #endif
 351         sport_handle = sport_init(&sport_params[sport_num], 2, \
 352                         sizeof(struct ac97_frame), NULL);
 353         if (!sport_handle) {
 354                 ret = -ENODEV;
 355                 goto sport_err;
 356         }
 357         /*SPORT works in TDM mode to simulate AC97 transfers*/
 358         ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1);
 359         if (ret) {
 360                 pr_err("SPORT is busy!\n");
 361                 ret = -EBUSY;
 362                 goto sport_config_err;
 363         }
 364
 365         ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1));
 366         if (ret) {
 367                 pr_err("SPORT is busy!\n");
 368                 ret = -EBUSY;
 369                 goto sport_config_err;
 370         }
 371
 372         ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1));
 373         if (ret) {
 374                 pr_err("SPORT is busy!\n");
 375                 ret = -EBUSY;
 376                 goto sport_config_err;
 377         }
 378
 379         return 0;
 380
 381 sport_config_err:
 382         kfree(sport_handle);
 383 sport_err:
 384 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 385         gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 386 #endif
 387 gpio_err:
 388         peripheral_free_list(&sport_req[sport_num][0]);
 389 peripheral_err:
 390         free_page((unsigned long)cmd_count);
 391         cmd_count = NULL;
 392
 393         return ret;
 394 }
 395
 396 static void bf5xx_ac97_remove(struct platform_device *pdev,
 397                               struct snd_soc_dai *dai)
 398 {
 399         free_page((unsigned long)cmd_count);
 400         cmd_count = NULL;
 401         peripheral_free_list(&sport_req[sport_num][0]);
 402 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 403         gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 404 #endif
 405 }
 406
 407 struct snd_soc_dai bfin_ac97_dai = {
 408         .name = "bf5xx-ac97",
 409         .id = 0,
 410         .ac97_control = 1,
 411         .probe = bf5xx_ac97_probe,
 412         .remove = bf5xx_ac97_remove,
 413         .suspend = bf5xx_ac97_suspend,
 414         .resume = bf5xx_ac97_resume,
 415         .playback = {
 416                 .stream_name = "AC97 Playback",
 417                 .channels_min = 2,
 418 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
 419                 .channels_max = 6,
 420 #else
 421                 .channels_max = 2,
 422 #endif
 423                 .rates = SNDRV_PCM_RATE_48000,
 424                 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
 425         .capture = {
 426                 .stream_name = "AC97 Capture",
 427                 .channels_min = 2,
 428                 .channels_max = 2,
 429                 .rates = SNDRV_PCM_RATE_48000,
 430                 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
 431 };
 432 EXPORT_SYMBOL_GPL(bfin_ac97_dai);
 433
 434 static int __devinit bfin_ac97_init(void)
 435 {
 436         return snd_soc_register_dai(&bfin_ac97_dai);
 437 }
 438 module_init(bfin_ac97_init);
 439
 440 static void __exit bfin_ac97_exit(void)
 441 {
 442         snd_soc_unregister_dai(&bfin_ac97_dai);
 443 }
 444 module_exit(bfin_ac97_exit);
 445
 446 MODULE_AUTHOR("Roy Huang");
 447 MODULE_DESCRIPTION("AC97 driver for ADI Blackfin");
 448 MODULE_LICENSE("GPL");