1 /* 2 * sound/soc/samsung/idma.c 3 * 4 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com 6 * 7 * I2S0's Internal DMA driver 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 */ 14 #include <linux/interrupt.h> 15 #include <linux/platform_device.h> 16 #include <linux/dma-mapping.h> 17 #include <linux/slab.h> 18 #include <linux/module.h> 19 #include <sound/pcm.h> 20 #include <sound/pcm_params.h> 21 #include <sound/soc.h> 22 23 #include "i2s.h" 24 #include "idma.h" 25 #include "i2s-regs.h" 26 27 #define ST_RUNNING (1<<0) 28 #define ST_OPENED (1<<1) 29 30 static const struct snd_pcm_hardware idma_hardware = { 31 .info = SNDRV_PCM_INFO_INTERLEAVED | 32 SNDRV_PCM_INFO_BLOCK_TRANSFER | 33 SNDRV_PCM_INFO_MMAP | 34 SNDRV_PCM_INFO_MMAP_VALID | 35 SNDRV_PCM_INFO_PAUSE | 36 SNDRV_PCM_INFO_RESUME, 37 .buffer_bytes_max = MAX_IDMA_BUFFER, 38 .period_bytes_min = 128, 39 .period_bytes_max = MAX_IDMA_PERIOD, 40 .periods_min = 1, 41 .periods_max = 2, 42 }; 43 44 struct idma_ctrl { 45 spinlock_t lock; 46 int state; 47 dma_addr_t start; 48 dma_addr_t pos; 49 dma_addr_t end; 50 dma_addr_t period; 51 dma_addr_t periodsz; 52 void *token; 53 void (*cb)(void *dt, int bytes_xfer); 54 }; 55 56 static struct idma_info { 57 spinlock_t lock; 58 void __iomem *regs; 59 dma_addr_t lp_tx_addr; 60 } idma; 61 62 static int idma_irq; 63 64 static void idma_getpos(dma_addr_t *src) 65 { 66 *src = idma.lp_tx_addr + 67 (readl(idma.regs + I2STRNCNT) & 0xffffff) * 4; 68 } 69 70 static int idma_enqueue(struct snd_pcm_substream *substream) 71 { 72 struct snd_pcm_runtime *runtime = substream->runtime; 73 struct idma_ctrl *prtd = substream->runtime->private_data; 74 u32 val; 75 76 spin_lock(&prtd->lock); 77 prtd->token = (void *) substream; 78 spin_unlock(&prtd->lock); 79 80 /* Internal DMA Level0 Interrupt Address */ 81 val = idma.lp_tx_addr + prtd->periodsz; 82 writel(val, idma.regs + I2SLVL0ADDR); 83 84 /* Start address0 of I2S internal DMA operation. */ 85 val = idma.lp_tx_addr; 86 writel(val, idma.regs + I2SSTR0); 87 88 /* 89 * Transfer block size for I2S internal DMA. 90 * Should decide transfer size before start dma operation 91 */ 92 val = readl(idma.regs + I2SSIZE); 93 val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT); 94 val |= (((runtime->dma_bytes >> 2) & 95 I2SSIZE_TRNMSK) << I2SSIZE_SHIFT); 96 writel(val, idma.regs + I2SSIZE); 97 98 val = readl(idma.regs + I2SAHB); 99 val |= AHB_INTENLVL0; 100 writel(val, idma.regs + I2SAHB); 101 102 return 0; 103 } 104 105 static void idma_setcallbk(struct snd_pcm_substream *substream, 106 void (*cb)(void *, int)) 107 { 108 struct idma_ctrl *prtd = substream->runtime->private_data; 109 110 spin_lock(&prtd->lock); 111 prtd->cb = cb; 112 spin_unlock(&prtd->lock); 113 } 114 115 static void idma_control(int op) 116 { 117 u32 val = readl(idma.regs + I2SAHB); 118 119 spin_lock(&idma.lock); 120 121 switch (op) { 122 case LPAM_DMA_START: 123 val |= (AHB_INTENLVL0 | AHB_DMAEN); 124 break; 125 case LPAM_DMA_STOP: 126 val &= ~(AHB_INTENLVL0 | AHB_DMAEN); 127 break; 128 default: 129 spin_unlock(&idma.lock); 130 return; 131 } 132 133 writel(val, idma.regs + I2SAHB); 134 spin_unlock(&idma.lock); 135 } 136 137 static void idma_done(void *id, int bytes_xfer) 138 { 139 struct snd_pcm_substream *substream = id; 140 struct idma_ctrl *prtd = substream->runtime->private_data; 141 142 if (prtd && (prtd->state & ST_RUNNING)) 143 snd_pcm_period_elapsed(substream); 144 } 145 146 static int idma_hw_params(struct snd_pcm_substream *substream, 147 struct snd_pcm_hw_params *params) 148 { 149 struct snd_pcm_runtime *runtime = substream->runtime; 150 struct idma_ctrl *prtd = substream->runtime->private_data; 151 u32 mod = readl(idma.regs + I2SMOD); 152 u32 ahb = readl(idma.regs + I2SAHB); 153 154 ahb |= (AHB_DMARLD | AHB_INTMASK); 155 mod |= MOD_TXS_IDMA; 156 writel(ahb, idma.regs + I2SAHB); 157 writel(mod, idma.regs + I2SMOD); 158 159 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 160 runtime->dma_bytes = params_buffer_bytes(params); 161 162 prtd->start = prtd->pos = runtime->dma_addr; 163 prtd->period = params_periods(params); 164 prtd->periodsz = params_period_bytes(params); 165 prtd->end = runtime->dma_addr + runtime->dma_bytes; 166 167 idma_setcallbk(substream, idma_done); 168 169 return 0; 170 } 171 172 static int idma_hw_free(struct snd_pcm_substream *substream) 173 { 174 snd_pcm_set_runtime_buffer(substream, NULL); 175 176 return 0; 177 } 178 179 static int idma_prepare(struct snd_pcm_substream *substream) 180 { 181 struct idma_ctrl *prtd = substream->runtime->private_data; 182 183 prtd->pos = prtd->start; 184 185 /* flush the DMA channel */ 186 idma_control(LPAM_DMA_STOP); 187 idma_enqueue(substream); 188 189 return 0; 190 } 191 192 static int idma_trigger(struct snd_pcm_substream *substream, int cmd) 193 { 194 struct idma_ctrl *prtd = substream->runtime->private_data; 195 int ret = 0; 196 197 spin_lock(&prtd->lock); 198 199 switch (cmd) { 200 case SNDRV_PCM_TRIGGER_RESUME: 201 case SNDRV_PCM_TRIGGER_START: 202 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 203 prtd->state |= ST_RUNNING; 204 idma_control(LPAM_DMA_START); 205 break; 206 207 case SNDRV_PCM_TRIGGER_SUSPEND: 208 case SNDRV_PCM_TRIGGER_STOP: 209 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 210 prtd->state &= ~ST_RUNNING; 211 idma_control(LPAM_DMA_STOP); 212 break; 213 214 default: 215 ret = -EINVAL; 216 break; 217 } 218 219 spin_unlock(&prtd->lock); 220 221 return ret; 222 } 223 224 static snd_pcm_uframes_t 225 idma_pointer(struct snd_pcm_substream *substream) 226 { 227 struct snd_pcm_runtime *runtime = substream->runtime; 228 struct idma_ctrl *prtd = runtime->private_data; 229 dma_addr_t src; 230 unsigned long res; 231 232 spin_lock(&prtd->lock); 233 234 idma_getpos(&src); 235 res = src - prtd->start; 236 237 spin_unlock(&prtd->lock); 238 239 return bytes_to_frames(substream->runtime, res); 240 } 241 242 static int idma_mmap(struct snd_pcm_substream *substream, 243 struct vm_area_struct *vma) 244 { 245 struct snd_pcm_runtime *runtime = substream->runtime; 246 unsigned long size, offset; 247 int ret; 248 249 /* From snd_pcm_lib_mmap_iomem */ 250 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 251 size = vma->vm_end - vma->vm_start; 252 offset = vma->vm_pgoff << PAGE_SHIFT; 253 ret = io_remap_pfn_range(vma, vma->vm_start, 254 (runtime->dma_addr + offset) >> PAGE_SHIFT, 255 size, vma->vm_page_prot); 256 257 return ret; 258 } 259 260 static irqreturn_t iis_irq(int irqno, void *dev_id) 261 { 262 struct idma_ctrl *prtd = (struct idma_ctrl *)dev_id; 263 u32 iisahb, val, addr; 264 265 iisahb = readl(idma.regs + I2SAHB); 266 267 val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0; 268 269 if (val) { 270 iisahb |= val; 271 writel(iisahb, idma.regs + I2SAHB); 272 273 addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr; 274 addr += prtd->periodsz; 275 addr %= (u32)(prtd->end - prtd->start); 276 addr += idma.lp_tx_addr; 277 278 writel(addr, idma.regs + I2SLVL0ADDR); 279 280 if (prtd->cb) 281 prtd->cb(prtd->token, prtd->period); 282 } 283 284 return IRQ_HANDLED; 285 } 286 287 static int idma_open(struct snd_pcm_substream *substream) 288 { 289 struct snd_pcm_runtime *runtime = substream->runtime; 290 struct idma_ctrl *prtd; 291 int ret; 292 293 snd_soc_set_runtime_hwparams(substream, &idma_hardware); 294 295 prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL); 296 if (prtd == NULL) 297 return -ENOMEM; 298 299 ret = request_irq(idma_irq, iis_irq, 0, "i2s", prtd); 300 if (ret < 0) { 301 pr_err("fail to claim i2s irq , ret = %d\n", ret); 302 kfree(prtd); 303 return ret; 304 } 305 306 spin_lock_init(&prtd->lock); 307 308 runtime->private_data = prtd; 309 310 return 0; 311 } 312 313 static int idma_close(struct snd_pcm_substream *substream) 314 { 315 struct snd_pcm_runtime *runtime = substream->runtime; 316 struct idma_ctrl *prtd = runtime->private_data; 317 318 free_irq(idma_irq, prtd); 319 320 if (!prtd) 321 pr_err("idma_close called with prtd == NULL\n"); 322 323 kfree(prtd); 324 325 return 0; 326 } 327 328 static const struct snd_pcm_ops idma_ops = { 329 .open = idma_open, 330 .close = idma_close, 331 .ioctl = snd_pcm_lib_ioctl, 332 .trigger = idma_trigger, 333 .pointer = idma_pointer, 334 .mmap = idma_mmap, 335 .hw_params = idma_hw_params, 336 .hw_free = idma_hw_free, 337 .prepare = idma_prepare, 338 }; 339 340 static void idma_free(struct snd_pcm *pcm) 341 { 342 struct snd_pcm_substream *substream; 343 struct snd_dma_buffer *buf; 344 345 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 346 if (!substream) 347 return; 348 349 buf = &substream->dma_buffer; 350 if (!buf->area) 351 return; 352 353 iounmap((void __iomem *)buf->area); 354 355 buf->area = NULL; 356 buf->addr = 0; 357 } 358 359 static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream) 360 { 361 struct snd_pcm_substream *substream = pcm->streams[stream].substream; 362 struct snd_dma_buffer *buf = &substream->dma_buffer; 363 364 buf->dev.dev = pcm->card->dev; 365 buf->private_data = NULL; 366 367 /* Assign PCM buffer pointers */ 368 buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS; 369 buf->addr = idma.lp_tx_addr; 370 buf->bytes = idma_hardware.buffer_bytes_max; 371 buf->area = (unsigned char * __force)ioremap(buf->addr, buf->bytes); 372 373 return 0; 374 } 375 376 static int idma_new(struct snd_soc_pcm_runtime *rtd) 377 { 378 struct snd_card *card = rtd->card->snd_card; 379 struct snd_pcm *pcm = rtd->pcm; 380 int ret; 381 382 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 383 if (ret) 384 return ret; 385 386 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 387 ret = preallocate_idma_buffer(pcm, 388 SNDRV_PCM_STREAM_PLAYBACK); 389 } 390 391 return ret; 392 } 393 394 void idma_reg_addr_init(void __iomem *regs, dma_addr_t addr) 395 { 396 spin_lock_init(&idma.lock); 397 idma.regs = regs; 398 idma.lp_tx_addr = addr; 399 } 400 EXPORT_SYMBOL_GPL(idma_reg_addr_init); 401 402 static const struct snd_soc_platform_driver asoc_idma_platform = { 403 .ops = &idma_ops, 404 .pcm_new = idma_new, 405 .pcm_free = idma_free, 406 }; 407 408 static int asoc_idma_platform_probe(struct platform_device *pdev) 409 { 410 idma_irq = platform_get_irq(pdev, 0); 411 if (idma_irq < 0) 412 return idma_irq; 413 414 return devm_snd_soc_register_platform(&pdev->dev, &asoc_idma_platform); 415 } 416 417 static struct platform_driver asoc_idma_driver = { 418 .driver = { 419 .name = "samsung-idma", 420 }, 421 422 .probe = asoc_idma_platform_probe, 423 }; 424 425 module_platform_driver(asoc_idma_driver); 426 427 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>"); 428 MODULE_DESCRIPTION("Samsung ASoC IDMA Driver"); 429 MODULE_LICENSE("GPL"); 430