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 #if defined(CONFIG_BF54x)
  58 static struct sport_param sport_params[4] = {
  59         {
  60                 .dma_rx_chan    = CH_SPORT0_RX,
  61                 .dma_tx_chan    = CH_SPORT0_TX,
  62                 .err_irq        = IRQ_SPORT0_ERR,
  63                 .regs           = (struct sport_register *)SPORT0_TCR1,
  64         },
  65         {
  66                 .dma_rx_chan    = CH_SPORT1_RX,
  67                 .dma_tx_chan    = CH_SPORT1_TX,
  68                 .err_irq        = IRQ_SPORT1_ERR,
  69                 .regs           = (struct sport_register *)SPORT1_TCR1,
  70         },
  71         {
  72                 .dma_rx_chan    = CH_SPORT2_RX,
  73                 .dma_tx_chan    = CH_SPORT2_TX,
  74                 .err_irq        = IRQ_SPORT2_ERR,
  75                 .regs           = (struct sport_register *)SPORT2_TCR1,
  76         },
  77         {
  78                 .dma_rx_chan    = CH_SPORT3_RX,
  79                 .dma_tx_chan    = CH_SPORT3_TX,
  80                 .err_irq        = IRQ_SPORT3_ERR,
  81                 .regs           = (struct sport_register *)SPORT3_TCR1,
  82         }
  83 };
  84 #else
  85 static struct sport_param sport_params[2] = {
  86         {
  87                 .dma_rx_chan    = CH_SPORT0_RX,
  88                 .dma_tx_chan    = CH_SPORT0_TX,
  89                 .err_irq        = IRQ_SPORT0_ERROR,
  90                 .regs           = (struct sport_register *)SPORT0_TCR1,
  91         },
  92         {
  93                 .dma_rx_chan    = CH_SPORT1_RX,
  94                 .dma_tx_chan    = CH_SPORT1_TX,
  95                 .err_irq        = IRQ_SPORT1_ERROR,
  96                 .regs           = (struct sport_register *)SPORT1_TCR1,
  97         }
  98 };
  99 #endif
 100
 101 void bf5xx_pcm_to_ac97(struct ac97_frame *dst, const __u32 *src, \
 102                 size_t count)
 103 {
 104         while (count--) {
 105                 dst->ac97_tag = TAG_VALID | TAG_PCM;
 106                 (dst++)->ac97_pcm = *src++;
 107         }
 108 }
 109 EXPORT_SYMBOL(bf5xx_pcm_to_ac97);
 110
 111 void bf5xx_ac97_to_pcm(const struct ac97_frame *src, __u32 *dst, \
 112                 size_t count)
 113 {
 114         while (count--)
 115                 *(dst++) = (src++)->ac97_pcm;
 116 }
 117 EXPORT_SYMBOL(bf5xx_ac97_to_pcm);
 118
 119 static unsigned int sport_tx_curr_frag(struct sport_device *sport)
 120 {
 121         return sport->tx_curr_frag = sport_curr_offset_tx(sport) / \
 122                         sport->tx_fragsize;
 123 }
 124
 125 static void enqueue_cmd(struct snd_ac97 *ac97, __u16 addr, __u16 data)
 126 {
 127         struct sport_device *sport = sport_handle;
 128         int nextfrag = sport_tx_curr_frag(sport);
 129         struct ac97_frame *nextwrite;
 130
 131         sport_incfrag(sport, &nextfrag, 1);
 132
 133         nextwrite = (struct ac97_frame *)(sport->tx_buf + \
 134                         nextfrag * sport->tx_fragsize);
 135         pr_debug("sport->tx_buf:%p, nextfrag:0x%x nextwrite:%p, cmd_count:%d\n",
 136                 sport->tx_buf, nextfrag, nextwrite, cmd_count[nextfrag]);
 137         nextwrite[cmd_count[nextfrag]].ac97_tag |= TAG_CMD;
 138         nextwrite[cmd_count[nextfrag]].ac97_addr = addr;
 139         nextwrite[cmd_count[nextfrag]].ac97_data = data;
 140         ++cmd_count[nextfrag];
 141         pr_debug("ac97_sport: Inserting %02x/%04x into fragment %d\n",
 142                         addr >> 8, data, nextfrag);
 143 }
 144
 145 static unsigned short bf5xx_ac97_read(struct snd_ac97 *ac97,
 146         unsigned short reg)
 147 {
 148         struct ac97_frame out_frame[2], in_frame[2];
 149
 150         pr_debug("%s enter 0x%x\n", __func__, reg);
 151
 152         /* When dma descriptor is enabled, the register should not be read */
 153         if (sport_handle->tx_run || sport_handle->rx_run) {
 154                 pr_err("Could you send a mail to cliff.cai@analog.com "
 155                                 "to report this?\n");
 156                 return -EFAULT;
 157         }
 158
 159         memset(&out_frame, 0, 2 * sizeof(struct ac97_frame));
 160         memset(&in_frame, 0, 2 * sizeof(struct ac97_frame));
 161         out_frame[0].ac97_tag = TAG_VALID | TAG_CMD;
 162         out_frame[0].ac97_addr = ((reg << 8) | 0x8000);
 163         sport_send_and_recv(sport_handle, (unsigned char *)&out_frame,
 164                         (unsigned char *)&in_frame,
 165                         2 * sizeof(struct ac97_frame));
 166         return in_frame[1].ac97_data;
 167 }
 168
 169 void bf5xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 170         unsigned short val)
 171 {
 172         pr_debug("%s enter 0x%x:0x%04x\n", __func__, reg, val);
 173
 174         if (sport_handle->tx_run) {
 175                 enqueue_cmd(ac97, (reg << 8), val); /* write */
 176                 enqueue_cmd(ac97, (reg << 8) | 0x8000, 0); /* read back */
 177         } else {
 178                 struct ac97_frame frame;
 179                 memset(&frame, 0, sizeof(struct ac97_frame));
 180                 frame.ac97_tag = TAG_VALID | TAG_CMD;
 181                 frame.ac97_addr = (reg << 8);
 182                 frame.ac97_data = val;
 183                 sport_send_and_recv(sport_handle, (unsigned char *)&frame, \
 184                                 NULL, sizeof(struct ac97_frame));
 185         }
 186 }
 187
 188 static void bf5xx_ac97_warm_reset(struct snd_ac97 *ac97)
 189 {
 190 #if defined(CONFIG_BF54x) || defined(CONFIG_BF561) || \
 191  (defined(BF537_FAMILY) && (CONFIG_SND_BF5XX_SPORT_NUM == 1))
 192
 193 #define CONCAT(a, b, c) a ## b ## c
 194 #define BFIN_SPORT_RFS(x) CONCAT(P_SPORT, x, _RFS)
 195
 196         u16 per = BFIN_SPORT_RFS(CONFIG_SND_BF5XX_SPORT_NUM);
 197         u16 gpio = P_IDENT(BFIN_SPORT_RFS(CONFIG_SND_BF5XX_SPORT_NUM));
 198
 199         pr_debug("%s enter\n", __func__);
 200
 201         peripheral_free(per);
 202         gpio_request(gpio, "bf5xx-ac97");
 203         gpio_direction_output(gpio, 1);
 204         udelay(2);
 205         gpio_set_value(gpio, 0);
 206         udelay(1);
 207         gpio_free(gpio);
 208         peripheral_request(per, "soc-audio");
 209 #else
 210         pr_info("%s: Not implemented\n", __func__);
 211 #endif
 212 }
 213
 214 static void bf5xx_ac97_cold_reset(struct snd_ac97 *ac97)
 215 {
 216 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 217         pr_debug("%s enter\n", __func__);
 218
 219         /* It is specified for bf548-ezkit */
 220         gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 0);
 221         /* Keep reset pin low for 1 ms */
 222         mdelay(1);
 223         gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
 224         /* Wait for bit clock recover */
 225         mdelay(1);
 226 #else
 227         pr_info("%s: Not implemented\n", __func__);
 228 #endif
 229 }
 230
 231 struct snd_ac97_bus_ops soc_ac97_ops = {
 232         .read   = bf5xx_ac97_read,
 233         .write  = bf5xx_ac97_write,
 234         .warm_reset     = bf5xx_ac97_warm_reset,
 235         .reset  = bf5xx_ac97_cold_reset,
 236 };
 237 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 238
 239 #ifdef CONFIG_PM
 240 static int bf5xx_ac97_suspend(struct platform_device *pdev,
 241         struct snd_soc_dai *dai)
 242 {
 243         struct sport_device *sport =
 244                 (struct sport_device *)dai->private_data;
 245
 246         pr_debug("%s : sport %d\n", __func__, dai->id);
 247         if (!dai->active)
 248                 return 0;
 249         if (dai->capture.active)
 250                 sport_rx_stop(sport);
 251         if (dai->playback.active)
 252                 sport_tx_stop(sport);
 253         return 0;
 254 }
 255
 256 static int bf5xx_ac97_resume(struct platform_device *pdev,
 257         struct snd_soc_dai *dai)
 258 {
 259         int ret;
 260         struct sport_device *sport =
 261                 (struct sport_device *)dai->private_data;
 262
 263         pr_debug("%s : sport %d\n", __func__, dai->id);
 264         if (!dai->active)
 265                 return 0;
 266
 267         ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1);
 268         if (ret) {
 269                 pr_err("SPORT is busy!\n");
 270                 return -EBUSY;
 271         }
 272
 273         ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1));
 274         if (ret) {
 275                 pr_err("SPORT is busy!\n");
 276                 return -EBUSY;
 277         }
 278
 279         ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1));
 280         if (ret) {
 281                 pr_err("SPORT is busy!\n");
 282                 return -EBUSY;
 283         }
 284
 285         if (dai->capture.active)
 286                 sport_rx_start(sport);
 287         if (dai->playback.active)
 288                 sport_tx_start(sport);
 289         return 0;
 290 }
 291
 292 #else
 293 #define bf5xx_ac97_suspend      NULL
 294 #define bf5xx_ac97_resume       NULL
 295 #endif
 296
 297 static int bf5xx_ac97_probe(struct platform_device *pdev,
 298                             struct snd_soc_dai *dai)
 299 {
 300         int ret;
 301 #if defined(CONFIG_BF54x)
 302         u16 sport_req[][7] = {PIN_REQ_SPORT_0, PIN_REQ_SPORT_1,
 303                                  PIN_REQ_SPORT_2, PIN_REQ_SPORT_3};
 304 #else
 305         u16 sport_req[][7] = {PIN_REQ_SPORT_0, PIN_REQ_SPORT_1};
 306 #endif
 307         cmd_count = (int *)get_zeroed_page(GFP_KERNEL);
 308         if (cmd_count == NULL)
 309                 return -ENOMEM;
 310
 311         if (peripheral_request_list(&sport_req[sport_num][0], "soc-audio")) {
 312                 pr_err("Requesting Peripherals failed\n");
 313                 return -EFAULT;
 314                 }
 315
 316 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 317         /* Request PB3 as reset pin */
 318         if (gpio_request(CONFIG_SND_BF5XX_RESET_GPIO_NUM, "SND_AD198x RESET")) {
 319                 pr_err("Failed to request GPIO_%d for reset\n",
 320                                 CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 321                 peripheral_free_list(&sport_req[sport_num][0]);
 322                 return -1;
 323         }
 324         gpio_direction_output(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
 325 #endif
 326         sport_handle = sport_init(&sport_params[sport_num], 2, \
 327                         sizeof(struct ac97_frame), NULL);
 328         if (!sport_handle) {
 329                 peripheral_free_list(&sport_req[sport_num][0]);
 330 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 331                 gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 332 #endif
 333                 return -ENODEV;
 334         }
 335         /*SPORT works in TDM mode to simulate AC97 transfers*/
 336         ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1);
 337         if (ret) {
 338                 pr_err("SPORT is busy!\n");
 339                 kfree(sport_handle);
 340                 peripheral_free_list(&sport_req[sport_num][0]);
 341 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 342                 gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 343 #endif
 344                 return -EBUSY;
 345         }
 346
 347         ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1));
 348         if (ret) {
 349                 pr_err("SPORT is busy!\n");
 350                 kfree(sport_handle);
 351                 peripheral_free_list(&sport_req[sport_num][0]);
 352 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 353                 gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 354 #endif
 355                 return -EBUSY;
 356         }
 357
 358         ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1));
 359         if (ret) {
 360                 pr_err("SPORT is busy!\n");
 361                 kfree(sport_handle);
 362                 peripheral_free_list(&sport_req[sport_num][0]);
 363 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
 364                 gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
 365 #endif
 366                 return -EBUSY;
 367         }
 368         return 0;
 369 }
 370
 371 static void bf5xx_ac97_remove(struct platform_device *pdev,
 372                               struct snd_soc_dai *dai)
 373 {
 374         free_page((unsigned long)cmd_count);
 375         cmd_count = NULL;
 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         .type = SND_SOC_DAI_AC97,
 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                 .channels_max = 2,
 393                 .rates = SNDRV_PCM_RATE_48000,
 394                 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
 395         .capture = {
 396                 .stream_name = "AC97 Capture",
 397                 .channels_min = 2,
 398                 .channels_max = 2,
 399                 .rates = SNDRV_PCM_RATE_48000,
 400                 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
 401 };
 402 EXPORT_SYMBOL_GPL(bfin_ac97_dai);
 403
 404 MODULE_AUTHOR("Roy Huang");
 405 MODULE_DESCRIPTION("AC97 driver for ADI Blackfin");
 406 MODULE_LICENSE("GPL");