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         return 0;
 171 }
 172 EXPORT_SYMBOL(sport_config_tx_dma);
 173
 174 int sport_config_rx_dma(struct sport_device *sport, void *buf,
 175                 int fragcount, size_t fragsize)
 176 {
 177         unsigned int count;
 178         unsigned int cfg;
 179         dma_addr_t addr;
 180
 181         count = fragsize / sport->wdsize;
 182
 183         if (sport->rx_desc)
 184                 dma_free_coherent(NULL, sport->rx_desc_size,
 185                                 sport->rx_desc, 0);
 186
 187         sport->rx_desc = dma_alloc_coherent(NULL,
 188                         fragcount * sizeof(struct dmasg), &addr, 0);
 189         sport->rx_desc_size = fragcount * sizeof(struct dmasg);
 190         if (!sport->rx_desc)
 191                 return -ENOMEM;
 192
 193         sport->rx_buf = buf;
 194         sport->rx_fragsize = fragsize;
 195         sport->rx_frags = fragcount;
 196         cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize)
 197                 | WNR | NDSIZE_6;
 198
 199         setup_desc(sport->rx_desc, buf, fragcount, fragsize,
 200                    cfg | DMAEN, count, sport->wdsize);
 201         return 0;
 202 }
 203 EXPORT_SYMBOL(sport_config_rx_dma);
 204
 205 unsigned long sport_curr_offset_tx(struct sport_device *sport)
 206 {
 207         unsigned long curr = get_dma_curr_addr(sport->tx_dma_chan);
 208
 209         return (unsigned char *)curr - sport->tx_buf;
 210 }
 211 EXPORT_SYMBOL(sport_curr_offset_tx);
 212
 213 unsigned long sport_curr_offset_rx(struct sport_device *sport)
 214 {
 215         unsigned long curr = get_dma_curr_addr(sport->rx_dma_chan);
 216
 217         return (unsigned char *)curr - sport->rx_buf;
 218 }
 219 EXPORT_SYMBOL(sport_curr_offset_rx);
 220
 221 static irqreturn_t sport_tx_irq(int irq, void *dev_id)
 222 {
 223         struct sport_device *sport = dev_id;
 224         static unsigned long status;
 225
 226         status = get_dma_curr_irqstat(sport->tx_dma_chan);
 227         if (status & (DMA_DONE | DMA_ERR)) {
 228                 clear_dma_irqstat(sport->tx_dma_chan);
 229                 SSYNC();
 230         }
 231         if (sport->tx_callback)
 232                 sport->tx_callback(sport->tx_data);
 233         return IRQ_HANDLED;
 234 }
 235
 236 static irqreturn_t sport_rx_irq(int irq, void *dev_id)
 237 {
 238         struct sport_device *sport = dev_id;
 239         unsigned long status;
 240
 241         status = get_dma_curr_irqstat(sport->rx_dma_chan);
 242         if (status & (DMA_DONE | DMA_ERR)) {
 243                 clear_dma_irqstat(sport->rx_dma_chan);
 244                 SSYNC();
 245         }
 246         if (sport->rx_callback)
 247                 sport->rx_callback(sport->rx_data);
 248         return IRQ_HANDLED;
 249 }
 250
 251 static irqreturn_t sport_err_irq(int irq, void *dev_id)
 252 {
 253         struct sport_device *sport = dev_id;
 254         struct device *dev = &sport->pdev->dev;
 255
 256         if (sport->tx_regs->spctl & SPORT_CTL_DERRPRI)
 257                 dev_err(dev, "sport error: TUVF\n");
 258         if (sport->rx_regs->spctl & SPORT_CTL_DERRPRI)
 259                 dev_err(dev, "sport error: ROVF\n");
 260
 261         return IRQ_HANDLED;
 262 }
 263
 264 static int sport_get_resource(struct sport_device *sport)
 265 {
 266         struct platform_device *pdev = sport->pdev;
 267         struct device *dev = &pdev->dev;
 268         struct bfin_snd_platform_data *pdata = dev->platform_data;
 269         struct resource *res;
 270
 271         if (!pdata) {
 272                 dev_err(dev, "No platform data\n");
 273                 return -ENODEV;
 274         }
 275         sport->pin_req = pdata->pin_req;
 276
 277         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 278         if (!res) {
 279                 dev_err(dev, "No tx MEM resource\n");
 280                 return -ENODEV;
 281         }
 282         sport->tx_regs = (struct sport_register *)res->start;
 283
 284         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 285         if (!res) {
 286                 dev_err(dev, "No rx MEM resource\n");
 287                 return -ENODEV;
 288         }
 289         sport->rx_regs = (struct sport_register *)res->start;
 290
 291         res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 292         if (!res) {
 293                 dev_err(dev, "No tx DMA resource\n");
 294                 return -ENODEV;
 295         }
 296         sport->tx_dma_chan = res->start;
 297
 298         res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 299         if (!res) {
 300                 dev_err(dev, "No rx DMA resource\n");
 301                 return -ENODEV;
 302         }
 303         sport->rx_dma_chan = res->start;
 304
 305         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 306         if (!res) {
 307                 dev_err(dev, "No tx error irq resource\n");
 308                 return -ENODEV;
 309         }
 310         sport->tx_err_irq = res->start;
 311
 312         res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
 313         if (!res) {
 314                 dev_err(dev, "No rx error irq resource\n");
 315                 return -ENODEV;
 316         }
 317         sport->rx_err_irq = res->start;
 318
 319         return 0;
 320 }
 321
 322 static int sport_request_resource(struct sport_device *sport)
 323 {
 324         struct device *dev = &sport->pdev->dev;
 325         int ret;
 326
 327         ret = peripheral_request_list(sport->pin_req, "soc-audio");
 328         if (ret) {
 329                 dev_err(dev, "Unable to request sport pin\n");
 330                 return ret;
 331         }
 332
 333         ret = request_dma(sport->tx_dma_chan, "SPORT TX Data");
 334         if (ret) {
 335                 dev_err(dev, "Unable to allocate DMA channel for sport tx\n");
 336                 goto err_tx_dma;
 337         }
 338         set_dma_callback(sport->tx_dma_chan, sport_tx_irq, sport);
 339
 340         ret = request_dma(sport->rx_dma_chan, "SPORT RX Data");
 341         if (ret) {
 342                 dev_err(dev, "Unable to allocate DMA channel for sport rx\n");
 343                 goto err_rx_dma;
 344         }
 345         set_dma_callback(sport->rx_dma_chan, sport_rx_irq, sport);
 346
 347         ret = request_irq(sport->tx_err_irq, sport_err_irq,
 348                         0, "SPORT TX ERROR", sport);
 349         if (ret) {
 350                 dev_err(dev, "Unable to allocate tx error IRQ for sport\n");
 351                 goto err_tx_irq;
 352         }
 353
 354         ret = request_irq(sport->rx_err_irq, sport_err_irq,
 355                         0, "SPORT RX ERROR", sport);
 356         if (ret) {
 357                 dev_err(dev, "Unable to allocate rx error IRQ for sport\n");
 358                 goto err_rx_irq;
 359         }
 360
 361         return 0;
 362 err_rx_irq:
 363         free_irq(sport->tx_err_irq, sport);
 364 err_tx_irq:
 365         free_dma(sport->rx_dma_chan);
 366 err_rx_dma:
 367         free_dma(sport->tx_dma_chan);
 368 err_tx_dma:
 369         peripheral_free_list(sport->pin_req);
 370         return ret;
 371 }
 372
 373 static void sport_free_resource(struct sport_device *sport)
 374 {
 375         free_irq(sport->rx_err_irq, sport);
 376         free_irq(sport->tx_err_irq, sport);
 377         free_dma(sport->rx_dma_chan);
 378         free_dma(sport->tx_dma_chan);
 379         peripheral_free_list(sport->pin_req);
 380 }
 381
 382 struct sport_device *sport_create(struct platform_device *pdev)
 383 {
 384         struct device *dev = &pdev->dev;
 385         struct sport_device *sport;
 386         int ret;
 387
 388         sport = kzalloc(sizeof(*sport), GFP_KERNEL);
 389         if (!sport)
 390                 return NULL;
 391
 392         sport->pdev = pdev;
 393
 394         ret = sport_get_resource(sport);
 395         if (ret)
 396                 goto free_data;
 397
 398         ret = sport_request_resource(sport);
 399         if (ret)
 400                 goto free_data;
 401
 402         dev_dbg(dev, "SPORT create success\n");
 403         return sport;
 404 free_data:
 405         kfree(sport);
 406         return NULL;
 407 }
 408 EXPORT_SYMBOL(sport_create);
 409
 410 void sport_delete(struct sport_device *sport)
 411 {
 412         if (sport->tx_desc)
 413                 dma_free_coherent(NULL, sport->tx_desc_size,
 414                                 sport->tx_desc, 0);
 415         if (sport->rx_desc)
 416                 dma_free_coherent(NULL, sport->rx_desc_size,
 417                                 sport->rx_desc, 0);
 418         sport_free_resource(sport);
 419         kfree(sport);
 420 }
 421 EXPORT_SYMBOL(sport_delete);
 422
 423 MODULE_DESCRIPTION("Analog Devices BF6XX SPORT driver");
 424 MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
 425 MODULE_LICENSE("GPL v2");