sound/soc/blackfin/bf6xx-sport.c

   1 /*
   2  * bf6xx_sport.c Analog Devices BF6XX SPORT driver
   3  *
   4  * Copyright (c) 2012 Analog Devices Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #include <linux/device.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/slab.h>
  26
  27 #include <asm/blackfin.h>
  28 #include <asm/dma.h>
  29 #include <asm/portmux.h>
  30
  31 #include "bf6xx-sport.h"
  32
  33 int sport_set_tx_params(struct sport_device *sport,
  34                         struct sport_params *params)
  35 {
  36         if (sport->tx_regs->spctl & SPORT_CTL_SPENPRI)
  37                 return -EBUSY;
  38         sport->tx_regs->spctl = params->spctl | SPORT_CTL_SPTRAN;
  39         sport->tx_regs->div = params->div;
  40         SSYNC();
  41         return 0;
  42 }
  43 EXPORT_SYMBOL(sport_set_tx_params);
  44
  45 int sport_set_rx_params(struct sport_device *sport,
  46                         struct sport_params *params)
  47 {
  48         if (sport->rx_regs->spctl & SPORT_CTL_SPENPRI)
  49                 return -EBUSY;
  50         sport->rx_regs->spctl = params->spctl & ~SPORT_CTL_SPTRAN;
  51         sport->rx_regs->div = params->div;
  52         SSYNC();
  53         return 0;
  54 }
  55 EXPORT_SYMBOL(sport_set_rx_params);
  56
  57 static int compute_wdsize(size_t wdsize)
  58 {
  59         switch (wdsize) {
  60         case 1:
  61                 return WDSIZE_8 | PSIZE_8;
  62         case 2:
  63                 return WDSIZE_16 | PSIZE_16;
  64         default:
  65                 return WDSIZE_32 | PSIZE_32;
  66         }
  67 }
  68
  69 void sport_tx_start(struct sport_device *sport)
  70 {
  71         set_dma_next_desc_addr(sport->tx_dma_chan, sport->tx_desc);
  72         set_dma_config(sport->tx_dma_chan, DMAFLOW_LIST | DI_EN
  73                         | compute_wdsize(sport->wdsize) | NDSIZE_6);
  74         enable_dma(sport->tx_dma_chan);
  75         sport->tx_regs->spctl |= SPORT_CTL_SPENPRI;
  76         SSYNC();
  77 }
  78 EXPORT_SYMBOL(sport_tx_start);
  79
  80 void sport_rx_start(struct sport_device *sport)
  81 {
  82         set_dma_next_desc_addr(sport->rx_dma_chan, sport->rx_desc);
  83         set_dma_config(sport->rx_dma_chan, DMAFLOW_LIST | DI_EN | WNR
  84                         | compute_wdsize(sport->wdsize) | NDSIZE_6);
  85         enable_dma(sport->rx_dma_chan);
  86         sport->rx_regs->spctl |= SPORT_CTL_SPENPRI;
  87         SSYNC();
  88 }
  89 EXPORT_SYMBOL(sport_rx_start);
  90
  91 void sport_tx_stop(struct sport_device *sport)
  92 {
  93         sport->tx_regs->spctl &= ~SPORT_CTL_SPENPRI;
  94         SSYNC();
  95         disable_dma(sport->tx_dma_chan);
  96 }
  97 EXPORT_SYMBOL(sport_tx_stop);
  98
  99 void sport_rx_stop(struct sport_device *sport)
 100 {
 101         sport->rx_regs->spctl &= ~SPORT_CTL_SPENPRI;
 102         SSYNC();
 103         disable_dma(sport->rx_dma_chan);
 104 }
 105 EXPORT_SYMBOL(sport_rx_stop);
 106
 107 void sport_set_tx_callback(struct sport_device *sport,
 108                 void (*tx_callback)(void *), void *tx_data)
 109 {
 110         sport->tx_callback = tx_callback;
 111         sport->tx_data = tx_data;
 112 }
 113 EXPORT_SYMBOL(sport_set_tx_callback);
 114
 115 void sport_set_rx_callback(struct sport_device *sport,
 116                 void (*rx_callback)(void *), void *rx_data)
 117 {
 118         sport->rx_callback = rx_callback;
 119         sport->rx_data = rx_data;
 120 }
 121 EXPORT_SYMBOL(sport_set_rx_callback);
 122
 123 static void setup_desc(struct dmasg *desc, void *buf, int fragcount,
 124                 size_t fragsize, unsigned int cfg,
 125                 unsigned int count, size_t wdsize)
 126 {
 127
 128         int i;
 129
 130         for (i = 0; i < fragcount; ++i) {
 131                 desc[i].next_desc_addr  = &(desc[i + 1]);
 132                 desc[i].start_addr = (unsigned long)buf + i*fragsize;
 133                 desc[i].cfg = cfg;
 134                 desc[i].x_count = count;
 135                 desc[i].x_modify = wdsize;
 136                 desc[i].y_count = 0;
 137                 desc[i].y_modify = 0;
 138         }
 139
 140         /* make circular */
 141         desc[fragcount-1].next_desc_addr = desc;
 142 }
 143
 144 int sport_config_tx_dma(struct sport_device *sport, void *buf,
 145                 int fragcount, size_t fragsize)
 146 {
 147         unsigned int count;
 148         unsigned int cfg;
 149         dma_addr_t addr;
 150
 151         count = fragsize/sport->wdsize;
 152
 153         if (sport->tx_desc)
 154                 dma_free_coherent(NULL, sport->tx_desc_size,
 155                                 sport->tx_desc, 0);
 156
 157         sport->tx_desc = dma_alloc_coherent(NULL,
 158                         fragcount * sizeof(struct dmasg), &addr, 0);
 159         sport->tx_desc_size = fragcount * sizeof(struct dmasg);
 160         if (!sport->tx_desc)
 161                 return -ENOMEM;
 162
 163         sport->tx_buf = buf;
 164         sport->tx_fragsize = fragsize;
 165         sport->tx_frags = fragcount;
 166         cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize) | NDSIZE_6;
 167
 168         setup_desc(sport->tx_desc, buf, fragcount, fragsize,
 169                         cfg|DMAEN, count, sport->wdsize);
 170
 171         return 0;
 172 }
 173 EXPORT_SYMBOL(sport_config_tx_dma);
 174
 175 int sport_config_rx_dma(struct sport_device *sport, void *buf,
 176                 int fragcount, size_t fragsize)
 177 {
 178         unsigned int count;
 179         unsigned int cfg;
 180         dma_addr_t addr;
 181
 182         count = fragsize/sport->wdsize;
 183
 184         if (sport->rx_desc)
 185                 dma_free_coherent(NULL, sport->rx_desc_size,
 186                                 sport->rx_desc, 0);
 187
 188         sport->rx_desc = dma_alloc_coherent(NULL,
 189                         fragcount * sizeof(struct dmasg), &addr, 0);
 190         sport->rx_desc_size = fragcount * sizeof(struct dmasg);
 191         if (!sport->rx_desc)
 192                 return -ENOMEM;
 193
 194         sport->rx_buf = buf;
 195         sport->rx_fragsize = fragsize;
 196         sport->rx_frags = fragcount;
 197         cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize)
 198                 | WNR | NDSIZE_6;
 199
 200         setup_desc(sport->rx_desc, buf, fragcount, fragsize,
 201                         cfg|DMAEN, count, sport->wdsize);
 202
 203         return 0;
 204 }
 205 EXPORT_SYMBOL(sport_config_rx_dma);
 206
 207 unsigned long sport_curr_offset_tx(struct sport_device *sport)
 208 {
 209         unsigned long curr = get_dma_curr_addr(sport->tx_dma_chan);
 210
 211         return (unsigned char *)curr - sport->tx_buf;
 212 }
 213 EXPORT_SYMBOL(sport_curr_offset_tx);
 214
 215 unsigned long sport_curr_offset_rx(struct sport_device *sport)
 216 {
 217         unsigned long curr = get_dma_curr_addr(sport->rx_dma_chan);
 218
 219         return (unsigned char *)curr - sport->rx_buf;
 220 }
 221 EXPORT_SYMBOL(sport_curr_offset_rx);
 222
 223 static irqreturn_t sport_tx_irq(int irq, void *dev_id)
 224 {
 225         struct sport_device *sport = dev_id;
 226         static unsigned long status;
 227
 228         status = get_dma_curr_irqstat(sport->tx_dma_chan);
 229         if (status & (DMA_DONE|DMA_ERR)) {
 230                 clear_dma_irqstat(sport->tx_dma_chan);
 231                 SSYNC();
 232         }
 233         if (sport->tx_callback)
 234                 sport->tx_callback(sport->tx_data);
 235         return IRQ_HANDLED;
 236 }
 237
 238 static irqreturn_t sport_rx_irq(int irq, void *dev_id)
 239 {
 240         struct sport_device *sport = dev_id;
 241         unsigned long status;
 242
 243         status = get_dma_curr_irqstat(sport->rx_dma_chan);
 244         if (status & (DMA_DONE|DMA_ERR)) {
 245                 clear_dma_irqstat(sport->rx_dma_chan);
 246                 SSYNC();
 247         }
 248         if (sport->rx_callback)
 249                 sport->rx_callback(sport->rx_data);
 250         return IRQ_HANDLED;
 251 }
 252
 253 static irqreturn_t sport_err_irq(int irq, void *dev_id)
 254 {
 255         struct sport_device *sport = dev_id;
 256         struct device *dev = &sport->pdev->dev;
 257
 258         if (sport->tx_regs->spctl & SPORT_CTL_DERRPRI)
 259                 dev_err(dev, "sport error: TUVF\n");
 260         if (sport->rx_regs->spctl & SPORT_CTL_DERRPRI)
 261                 dev_err(dev, "sport error: ROVF\n");
 262
 263         return IRQ_HANDLED;
 264 }
 265
 266 static int sport_get_resource(struct sport_device *sport)
 267 {
 268         struct platform_device *pdev = sport->pdev;
 269         struct device *dev = &pdev->dev;
 270         struct bfin_snd_platform_data *pdata = dev->platform_data;
 271         struct resource *res;
 272
 273         if (!pdata) {
 274                 dev_err(dev, "No platform data\n");
 275                 return -ENODEV;
 276         }
 277         sport->pin_req = pdata->pin_req;
 278
 279         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 280         if (!res) {
 281                 dev_err(dev, "No tx MEM resource\n");
 282                 return -ENODEV;
 283         }
 284         sport->tx_regs = (struct sport_register *)res->start;
 285
 286         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 287         if (!res) {
 288                 dev_err(dev, "No rx MEM resource\n");
 289                 return -ENODEV;
 290         }
 291         sport->rx_regs = (struct sport_register *)res->start;
 292
 293         res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 294         if (!res) {
 295                 dev_err(dev, "No tx DMA resource\n");
 296                 return -ENODEV;
 297         }
 298         sport->tx_dma_chan = res->start;
 299
 300         res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 301         if (!res) {
 302                 dev_err(dev, "No rx DMA resource\n");
 303                 return -ENODEV;
 304         }
 305         sport->rx_dma_chan = res->start;
 306
 307         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 308         if (!res) {
 309                 dev_err(dev, "No tx error irq resource\n");
 310                 return -ENODEV;
 311         }
 312         sport->tx_err_irq = res->start;
 313
 314         res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
 315         if (!res) {
 316                 dev_err(dev, "No rx error irq resource\n");
 317                 return -ENODEV;
 318         }
 319         sport->rx_err_irq = res->start;
 320
 321         return 0;
 322 }
 323
 324 static int sport_request_resource(struct sport_device *sport)
 325 {
 326         struct device *dev = &sport->pdev->dev;
 327         int ret;
 328
 329         ret = peripheral_request_list(sport->pin_req, "soc-audio");
 330         if (ret) {
 331                 dev_err(dev, "Unable to request sport pin\n");
 332                 return ret;
 333         }
 334
 335         ret = request_dma(sport->tx_dma_chan, "SPORT TX Data");
 336         if (ret) {
 337                 dev_err(dev, "Unable to allocate DMA channel for sport tx\n");
 338                 goto err_tx_dma;
 339         }
 340         set_dma_callback(sport->tx_dma_chan, sport_tx_irq, sport);
 341
 342         ret = request_dma(sport->rx_dma_chan, "SPORT RX Data");
 343         if (ret) {
 344                 dev_err(dev, "Unable to allocate DMA channel for sport rx\n");
 345                 goto err_rx_dma;
 346         }
 347         set_dma_callback(sport->rx_dma_chan, sport_rx_irq, sport);
 348
 349         ret = request_irq(sport->tx_err_irq, sport_err_irq,
 350                         0, "SPORT TX ERROR", sport);
 351         if (ret) {
 352                 dev_err(dev, "Unable to allocate tx error IRQ for sport\n");
 353                 goto err_tx_irq;
 354         }
 355
 356         ret = request_irq(sport->rx_err_irq, sport_err_irq,
 357                         0, "SPORT RX ERROR", sport);
 358         if (ret) {
 359                 dev_err(dev, "Unable to allocate rx error IRQ for sport\n");
 360                 goto err_rx_irq;
 361         }
 362
 363         return 0;
 364 err_rx_irq:
 365         free_irq(sport->tx_err_irq, sport);
 366 err_tx_irq:
 367         free_dma(sport->rx_dma_chan);
 368 err_rx_dma:
 369         free_dma(sport->tx_dma_chan);
 370 err_tx_dma:
 371         peripheral_free_list(sport->pin_req);
 372         return ret;
 373 }
 374
 375 static void sport_free_resource(struct sport_device *sport)
 376 {
 377         free_irq(sport->rx_err_irq, sport);
 378         free_irq(sport->tx_err_irq, sport);
 379         free_dma(sport->rx_dma_chan);
 380         free_dma(sport->tx_dma_chan);
 381         peripheral_free_list(sport->pin_req);
 382 }
 383
 384 struct sport_device *sport_create(struct platform_device *pdev)
 385 {
 386         struct device *dev = &pdev->dev;
 387         struct sport_device *sport;
 388         int ret;
 389
 390         sport = kzalloc(sizeof(*sport), GFP_KERNEL);
 391         if (!sport) {
 392                 dev_err(dev, "Unable to allocate memory for sport device\n");
 393                 return NULL;
 394         }
 395         sport->pdev = pdev;
 396
 397         ret = sport_get_resource(sport);
 398         if (ret) {
 399                 kfree(sport);
 400                 return NULL;
 401         }
 402
 403         ret = sport_request_resource(sport);
 404         if (ret) {
 405                 kfree(sport);
 406                 return NULL;
 407         }
 408
 409         dev_dbg(dev, "SPORT create success\n");
 410         return sport;
 411 }
 412 EXPORT_SYMBOL(sport_create);
 413
 414 void sport_delete(struct sport_device *sport)
 415 {
 416         if (sport->tx_desc)
 417                 dma_free_coherent(NULL, sport->tx_desc_size,
 418                                 sport->tx_desc, 0);
 419         if (sport->rx_desc)
 420                 dma_free_coherent(NULL, sport->rx_desc_size,
 421                                 sport->rx_desc, 0);
 422         sport_free_resource(sport);
 423         kfree(sport);
 424 }
 425 EXPORT_SYMBOL(sport_delete);
 426
 427 MODULE_DESCRIPTION("Analog Devices BF6XX SPORT driver");
 428 MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
 429 MODULE_LICENSE("GPL v2");