Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Driver for the Atmel on-chip Audio Bitstream DAC (ABDAC) |
| 3 | * |
| 4 | * Copyright (C) 2006-2009 Atmel Corporation |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 as published by |
| 8 | * the Free Software Foundation. |
| 9 | */ |
| 10 | #include <linux/clk.h> |
| 11 | #include <linux/bitmap.h> |
| 12 | #include <linux/dw_dmac.h> |
| 13 | #include <linux/dmaengine.h> |
| 14 | #include <linux/dma-mapping.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/platform_device.h> |
Viresh Kumar | e2b35f3 | 2012-02-01 16:12:27 +0530 | [diff] [blame] | 19 | #include <linux/types.h> |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 20 | #include <linux/io.h> |
| 21 | |
| 22 | #include <sound/core.h> |
| 23 | #include <sound/initval.h> |
| 24 | #include <sound/pcm.h> |
| 25 | #include <sound/pcm_params.h> |
| 26 | #include <sound/atmel-abdac.h> |
| 27 | |
| 28 | /* DAC register offsets */ |
| 29 | #define DAC_DATA 0x0000 |
| 30 | #define DAC_CTRL 0x0008 |
| 31 | #define DAC_INT_MASK 0x000c |
| 32 | #define DAC_INT_EN 0x0010 |
| 33 | #define DAC_INT_DIS 0x0014 |
| 34 | #define DAC_INT_CLR 0x0018 |
| 35 | #define DAC_INT_STATUS 0x001c |
| 36 | |
| 37 | /* Bitfields in CTRL */ |
| 38 | #define DAC_SWAP_OFFSET 30 |
| 39 | #define DAC_SWAP_SIZE 1 |
| 40 | #define DAC_EN_OFFSET 31 |
| 41 | #define DAC_EN_SIZE 1 |
| 42 | |
| 43 | /* Bitfields in INT_MASK/INT_EN/INT_DIS/INT_STATUS/INT_CLR */ |
| 44 | #define DAC_UNDERRUN_OFFSET 28 |
| 45 | #define DAC_UNDERRUN_SIZE 1 |
| 46 | #define DAC_TX_READY_OFFSET 29 |
| 47 | #define DAC_TX_READY_SIZE 1 |
| 48 | |
| 49 | /* Bit manipulation macros */ |
| 50 | #define DAC_BIT(name) \ |
| 51 | (1 << DAC_##name##_OFFSET) |
| 52 | #define DAC_BF(name, value) \ |
| 53 | (((value) & ((1 << DAC_##name##_SIZE) - 1)) \ |
| 54 | << DAC_##name##_OFFSET) |
| 55 | #define DAC_BFEXT(name, value) \ |
| 56 | (((value) >> DAC_##name##_OFFSET) \ |
| 57 | & ((1 << DAC_##name##_SIZE) - 1)) |
| 58 | #define DAC_BFINS(name, value, old) \ |
| 59 | (((old) & ~(((1 << DAC_##name##_SIZE) - 1) \ |
| 60 | << DAC_##name##_OFFSET)) \ |
| 61 | | DAC_BF(name, value)) |
| 62 | |
| 63 | /* Register access macros */ |
| 64 | #define dac_readl(port, reg) \ |
| 65 | __raw_readl((port)->regs + DAC_##reg) |
| 66 | #define dac_writel(port, reg, value) \ |
| 67 | __raw_writel((value), (port)->regs + DAC_##reg) |
| 68 | |
| 69 | /* |
| 70 | * ABDAC supports a maximum of 6 different rates from a generic clock. The |
| 71 | * generic clock has a power of two divider, which gives 6 steps from 192 kHz |
| 72 | * to 5112 Hz. |
| 73 | */ |
| 74 | #define MAX_NUM_RATES 6 |
| 75 | /* ALSA seems to use rates between 192000 Hz and 5112 Hz. */ |
| 76 | #define RATE_MAX 192000 |
| 77 | #define RATE_MIN 5112 |
| 78 | |
| 79 | enum { |
| 80 | DMA_READY = 0, |
| 81 | }; |
| 82 | |
| 83 | struct atmel_abdac_dma { |
| 84 | struct dma_chan *chan; |
| 85 | struct dw_cyclic_desc *cdesc; |
| 86 | }; |
| 87 | |
| 88 | struct atmel_abdac { |
| 89 | struct clk *pclk; |
| 90 | struct clk *sample_clk; |
| 91 | struct platform_device *pdev; |
| 92 | struct atmel_abdac_dma dma; |
| 93 | |
| 94 | struct snd_pcm_hw_constraint_list constraints_rates; |
| 95 | struct snd_pcm_substream *substream; |
| 96 | struct snd_card *card; |
| 97 | struct snd_pcm *pcm; |
| 98 | |
| 99 | void __iomem *regs; |
| 100 | unsigned long flags; |
| 101 | unsigned int rates[MAX_NUM_RATES]; |
| 102 | unsigned int rates_num; |
| 103 | int irq; |
| 104 | }; |
| 105 | |
| 106 | #define get_dac(card) ((struct atmel_abdac *)(card)->private_data) |
| 107 | |
| 108 | /* This function is called by the DMA driver. */ |
| 109 | static void atmel_abdac_dma_period_done(void *arg) |
| 110 | { |
| 111 | struct atmel_abdac *dac = arg; |
| 112 | snd_pcm_period_elapsed(dac->substream); |
| 113 | } |
| 114 | |
| 115 | static int atmel_abdac_prepare_dma(struct atmel_abdac *dac, |
| 116 | struct snd_pcm_substream *substream, |
| 117 | enum dma_data_direction direction) |
| 118 | { |
| 119 | struct dma_chan *chan = dac->dma.chan; |
| 120 | struct dw_cyclic_desc *cdesc; |
| 121 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 122 | unsigned long buffer_len, period_len; |
| 123 | |
| 124 | /* |
| 125 | * We don't do DMA on "complex" transfers, i.e. with |
| 126 | * non-halfword-aligned buffers or lengths. |
| 127 | */ |
| 128 | if (runtime->dma_addr & 1 || runtime->buffer_size & 1) { |
| 129 | dev_dbg(&dac->pdev->dev, "too complex transfer\n"); |
| 130 | return -EINVAL; |
| 131 | } |
| 132 | |
| 133 | buffer_len = frames_to_bytes(runtime, runtime->buffer_size); |
| 134 | period_len = frames_to_bytes(runtime, runtime->period_size); |
| 135 | |
| 136 | cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len, |
Vinod Koul | 35e1658 | 2011-10-14 10:49:30 +0530 | [diff] [blame] | 137 | period_len, DMA_MEM_TO_DEV); |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 138 | if (IS_ERR(cdesc)) { |
| 139 | dev_dbg(&dac->pdev->dev, "could not prepare cyclic DMA\n"); |
| 140 | return PTR_ERR(cdesc); |
| 141 | } |
| 142 | |
| 143 | cdesc->period_callback = atmel_abdac_dma_period_done; |
| 144 | cdesc->period_callback_param = dac; |
| 145 | |
| 146 | dac->dma.cdesc = cdesc; |
| 147 | |
| 148 | set_bit(DMA_READY, &dac->flags); |
| 149 | |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static struct snd_pcm_hardware atmel_abdac_hw = { |
| 154 | .info = (SNDRV_PCM_INFO_MMAP |
| 155 | | SNDRV_PCM_INFO_MMAP_VALID |
| 156 | | SNDRV_PCM_INFO_INTERLEAVED |
| 157 | | SNDRV_PCM_INFO_BLOCK_TRANSFER |
| 158 | | SNDRV_PCM_INFO_RESUME |
| 159 | | SNDRV_PCM_INFO_PAUSE), |
| 160 | .formats = (SNDRV_PCM_FMTBIT_S16_BE), |
| 161 | .rates = (SNDRV_PCM_RATE_KNOT), |
| 162 | .rate_min = RATE_MIN, |
| 163 | .rate_max = RATE_MAX, |
| 164 | .channels_min = 2, |
| 165 | .channels_max = 2, |
| 166 | .buffer_bytes_max = 64 * 4096, |
| 167 | .period_bytes_min = 4096, |
| 168 | .period_bytes_max = 4096, |
Hans-Christian Egtvedt | fa075ed | 2009-04-02 13:42:26 +0200 | [diff] [blame] | 169 | .periods_min = 6, |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 170 | .periods_max = 64, |
| 171 | }; |
| 172 | |
| 173 | static int atmel_abdac_open(struct snd_pcm_substream *substream) |
| 174 | { |
| 175 | struct atmel_abdac *dac = snd_pcm_substream_chip(substream); |
| 176 | |
| 177 | dac->substream = substream; |
| 178 | atmel_abdac_hw.rate_max = dac->rates[dac->rates_num - 1]; |
| 179 | atmel_abdac_hw.rate_min = dac->rates[0]; |
| 180 | substream->runtime->hw = atmel_abdac_hw; |
| 181 | |
| 182 | return snd_pcm_hw_constraint_list(substream->runtime, 0, |
| 183 | SNDRV_PCM_HW_PARAM_RATE, &dac->constraints_rates); |
| 184 | } |
| 185 | |
| 186 | static int atmel_abdac_close(struct snd_pcm_substream *substream) |
| 187 | { |
| 188 | struct atmel_abdac *dac = snd_pcm_substream_chip(substream); |
| 189 | dac->substream = NULL; |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | static int atmel_abdac_hw_params(struct snd_pcm_substream *substream, |
| 194 | struct snd_pcm_hw_params *hw_params) |
| 195 | { |
| 196 | struct atmel_abdac *dac = snd_pcm_substream_chip(substream); |
| 197 | int retval; |
| 198 | |
| 199 | retval = snd_pcm_lib_malloc_pages(substream, |
| 200 | params_buffer_bytes(hw_params)); |
| 201 | if (retval < 0) |
| 202 | return retval; |
| 203 | /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ |
| 204 | if (retval == 1) |
| 205 | if (test_and_clear_bit(DMA_READY, &dac->flags)) |
| 206 | dw_dma_cyclic_free(dac->dma.chan); |
| 207 | |
| 208 | return retval; |
| 209 | } |
| 210 | |
| 211 | static int atmel_abdac_hw_free(struct snd_pcm_substream *substream) |
| 212 | { |
| 213 | struct atmel_abdac *dac = snd_pcm_substream_chip(substream); |
| 214 | if (test_and_clear_bit(DMA_READY, &dac->flags)) |
| 215 | dw_dma_cyclic_free(dac->dma.chan); |
| 216 | return snd_pcm_lib_free_pages(substream); |
| 217 | } |
| 218 | |
| 219 | static int atmel_abdac_prepare(struct snd_pcm_substream *substream) |
| 220 | { |
| 221 | struct atmel_abdac *dac = snd_pcm_substream_chip(substream); |
| 222 | int retval; |
| 223 | |
| 224 | retval = clk_set_rate(dac->sample_clk, 256 * substream->runtime->rate); |
| 225 | if (retval) |
| 226 | return retval; |
| 227 | |
| 228 | if (!test_bit(DMA_READY, &dac->flags)) |
| 229 | retval = atmel_abdac_prepare_dma(dac, substream, DMA_TO_DEVICE); |
| 230 | |
| 231 | return retval; |
| 232 | } |
| 233 | |
| 234 | static int atmel_abdac_trigger(struct snd_pcm_substream *substream, int cmd) |
| 235 | { |
| 236 | struct atmel_abdac *dac = snd_pcm_substream_chip(substream); |
| 237 | int retval = 0; |
| 238 | |
| 239 | switch (cmd) { |
| 240 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ |
| 241 | case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ |
| 242 | case SNDRV_PCM_TRIGGER_START: |
| 243 | clk_enable(dac->sample_clk); |
| 244 | retval = dw_dma_cyclic_start(dac->dma.chan); |
| 245 | if (retval) |
| 246 | goto out; |
| 247 | dac_writel(dac, CTRL, DAC_BIT(EN)); |
| 248 | break; |
| 249 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ |
| 250 | case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ |
| 251 | case SNDRV_PCM_TRIGGER_STOP: |
| 252 | dw_dma_cyclic_stop(dac->dma.chan); |
| 253 | dac_writel(dac, DATA, 0); |
| 254 | dac_writel(dac, CTRL, 0); |
| 255 | clk_disable(dac->sample_clk); |
| 256 | break; |
| 257 | default: |
| 258 | retval = -EINVAL; |
| 259 | break; |
| 260 | } |
| 261 | out: |
| 262 | return retval; |
| 263 | } |
| 264 | |
| 265 | static snd_pcm_uframes_t |
| 266 | atmel_abdac_pointer(struct snd_pcm_substream *substream) |
| 267 | { |
| 268 | struct atmel_abdac *dac = snd_pcm_substream_chip(substream); |
| 269 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 270 | snd_pcm_uframes_t frames; |
| 271 | unsigned long bytes; |
| 272 | |
| 273 | bytes = dw_dma_get_src_addr(dac->dma.chan); |
| 274 | bytes -= runtime->dma_addr; |
| 275 | |
| 276 | frames = bytes_to_frames(runtime, bytes); |
| 277 | if (frames >= runtime->buffer_size) |
| 278 | frames -= runtime->buffer_size; |
| 279 | |
| 280 | return frames; |
| 281 | } |
| 282 | |
| 283 | static irqreturn_t abdac_interrupt(int irq, void *dev_id) |
| 284 | { |
| 285 | struct atmel_abdac *dac = dev_id; |
| 286 | u32 status; |
| 287 | |
| 288 | status = dac_readl(dac, INT_STATUS); |
| 289 | if (status & DAC_BIT(UNDERRUN)) { |
| 290 | dev_err(&dac->pdev->dev, "underrun detected\n"); |
| 291 | dac_writel(dac, INT_CLR, DAC_BIT(UNDERRUN)); |
| 292 | } else { |
| 293 | dev_err(&dac->pdev->dev, "spurious interrupt (status=0x%x)\n", |
| 294 | status); |
| 295 | dac_writel(dac, INT_CLR, status); |
| 296 | } |
| 297 | |
| 298 | return IRQ_HANDLED; |
| 299 | } |
| 300 | |
| 301 | static struct snd_pcm_ops atmel_abdac_ops = { |
| 302 | .open = atmel_abdac_open, |
| 303 | .close = atmel_abdac_close, |
| 304 | .ioctl = snd_pcm_lib_ioctl, |
| 305 | .hw_params = atmel_abdac_hw_params, |
| 306 | .hw_free = atmel_abdac_hw_free, |
| 307 | .prepare = atmel_abdac_prepare, |
| 308 | .trigger = atmel_abdac_trigger, |
| 309 | .pointer = atmel_abdac_pointer, |
| 310 | }; |
| 311 | |
Bill Pemberton | 61dc674 | 2012-12-06 12:35:13 -0500 | [diff] [blame] | 312 | static int atmel_abdac_pcm_new(struct atmel_abdac *dac) |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 313 | { |
| 314 | struct snd_pcm_hardware hw = atmel_abdac_hw; |
| 315 | struct snd_pcm *pcm; |
| 316 | int retval; |
| 317 | |
| 318 | retval = snd_pcm_new(dac->card, dac->card->shortname, |
| 319 | dac->pdev->id, 1, 0, &pcm); |
| 320 | if (retval) |
| 321 | return retval; |
| 322 | |
| 323 | strcpy(pcm->name, dac->card->shortname); |
| 324 | pcm->private_data = dac; |
| 325 | pcm->info_flags = 0; |
| 326 | dac->pcm = pcm; |
| 327 | |
| 328 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &atmel_abdac_ops); |
| 329 | |
| 330 | retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, |
| 331 | &dac->pdev->dev, hw.periods_min * hw.period_bytes_min, |
| 332 | hw.buffer_bytes_max); |
| 333 | |
| 334 | return retval; |
| 335 | } |
| 336 | |
| 337 | static bool filter(struct dma_chan *chan, void *slave) |
| 338 | { |
| 339 | struct dw_dma_slave *dws = slave; |
| 340 | |
| 341 | if (dws->dma_dev == chan->device->dev) { |
| 342 | chan->private = dws; |
| 343 | return true; |
| 344 | } else |
| 345 | return false; |
| 346 | } |
| 347 | |
| 348 | static int set_sample_rates(struct atmel_abdac *dac) |
| 349 | { |
| 350 | long new_rate = RATE_MAX; |
| 351 | int retval = -EINVAL; |
| 352 | int index = 0; |
| 353 | |
| 354 | /* we start at 192 kHz and work our way down to 5112 Hz */ |
| 355 | while (new_rate >= RATE_MIN && index < (MAX_NUM_RATES + 1)) { |
| 356 | new_rate = clk_round_rate(dac->sample_clk, 256 * new_rate); |
Paul Walmsley | 337bb33 | 2013-12-09 18:49:13 -0800 | [diff] [blame] | 357 | if (new_rate <= 0) |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 358 | break; |
| 359 | /* make sure we are below the ABDAC clock */ |
Takashi Iwai | e4de211 | 2013-12-02 15:07:59 +0100 | [diff] [blame] | 360 | if (index < MAX_NUM_RATES && |
| 361 | new_rate <= clk_get_rate(dac->pclk)) { |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 362 | dac->rates[index] = new_rate / 256; |
| 363 | index++; |
| 364 | } |
| 365 | /* divide by 256 and then by two to get next rate */ |
| 366 | new_rate /= 256 * 2; |
| 367 | } |
| 368 | |
| 369 | if (index) { |
| 370 | int i; |
| 371 | |
| 372 | /* reverse array, smallest go first */ |
| 373 | for (i = 0; i < (index / 2); i++) { |
| 374 | unsigned int tmp = dac->rates[index - 1 - i]; |
| 375 | dac->rates[index - 1 - i] = dac->rates[i]; |
| 376 | dac->rates[i] = tmp; |
| 377 | } |
| 378 | |
| 379 | dac->constraints_rates.count = index; |
| 380 | dac->constraints_rates.list = dac->rates; |
| 381 | dac->constraints_rates.mask = 0; |
| 382 | dac->rates_num = index; |
| 383 | |
| 384 | retval = 0; |
| 385 | } |
| 386 | |
| 387 | return retval; |
| 388 | } |
| 389 | |
Bill Pemberton | 61dc674 | 2012-12-06 12:35:13 -0500 | [diff] [blame] | 390 | static int atmel_abdac_probe(struct platform_device *pdev) |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 391 | { |
| 392 | struct snd_card *card; |
| 393 | struct atmel_abdac *dac; |
| 394 | struct resource *regs; |
| 395 | struct atmel_abdac_pdata *pdata; |
| 396 | struct clk *pclk; |
| 397 | struct clk *sample_clk; |
| 398 | int retval; |
| 399 | int irq; |
| 400 | |
| 401 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 402 | if (!regs) { |
| 403 | dev_dbg(&pdev->dev, "no memory resource\n"); |
| 404 | return -ENXIO; |
| 405 | } |
| 406 | |
| 407 | irq = platform_get_irq(pdev, 0); |
| 408 | if (irq < 0) { |
| 409 | dev_dbg(&pdev->dev, "could not get IRQ number\n"); |
| 410 | return irq; |
| 411 | } |
| 412 | |
| 413 | pdata = pdev->dev.platform_data; |
| 414 | if (!pdata) { |
| 415 | dev_dbg(&pdev->dev, "no platform data\n"); |
| 416 | return -ENXIO; |
| 417 | } |
| 418 | |
| 419 | pclk = clk_get(&pdev->dev, "pclk"); |
| 420 | if (IS_ERR(pclk)) { |
| 421 | dev_dbg(&pdev->dev, "no peripheral clock\n"); |
| 422 | return PTR_ERR(pclk); |
| 423 | } |
| 424 | sample_clk = clk_get(&pdev->dev, "sample_clk"); |
Vasiliy Kulikov | c0763e6 | 2010-11-21 20:40:07 +0300 | [diff] [blame] | 425 | if (IS_ERR(sample_clk)) { |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 426 | dev_dbg(&pdev->dev, "no sample clock\n"); |
Takashi Iwai | 1beded5 | 2010-11-22 08:58:13 +0100 | [diff] [blame] | 427 | retval = PTR_ERR(sample_clk); |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 428 | goto out_put_pclk; |
| 429 | } |
| 430 | clk_enable(pclk); |
| 431 | |
Takashi Iwai | a4f2473 | 2014-01-29 14:26:22 +0100 | [diff] [blame] | 432 | retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1, |
| 433 | SNDRV_DEFAULT_STR1, THIS_MODULE, |
| 434 | sizeof(struct atmel_abdac), &card); |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 435 | if (retval) { |
| 436 | dev_dbg(&pdev->dev, "could not create sound card device\n"); |
| 437 | goto out_put_sample_clk; |
| 438 | } |
| 439 | |
| 440 | dac = get_dac(card); |
| 441 | |
| 442 | dac->irq = irq; |
| 443 | dac->card = card; |
| 444 | dac->pclk = pclk; |
| 445 | dac->sample_clk = sample_clk; |
| 446 | dac->pdev = pdev; |
| 447 | |
| 448 | retval = set_sample_rates(dac); |
| 449 | if (retval < 0) { |
| 450 | dev_dbg(&pdev->dev, "could not set supported rates\n"); |
| 451 | goto out_free_card; |
| 452 | } |
| 453 | |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 454 | dac->regs = ioremap(regs->start, resource_size(regs)); |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 455 | if (!dac->regs) { |
| 456 | dev_dbg(&pdev->dev, "could not remap register memory\n"); |
Julia Lawall | aaf265c | 2012-08-19 09:02:58 +0200 | [diff] [blame] | 457 | retval = -ENOMEM; |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 458 | goto out_free_card; |
| 459 | } |
| 460 | |
| 461 | /* make sure the DAC is silent and disabled */ |
| 462 | dac_writel(dac, DATA, 0); |
| 463 | dac_writel(dac, CTRL, 0); |
| 464 | |
| 465 | retval = request_irq(irq, abdac_interrupt, 0, "abdac", dac); |
| 466 | if (retval) { |
| 467 | dev_dbg(&pdev->dev, "could not request irq\n"); |
| 468 | goto out_unmap_regs; |
| 469 | } |
| 470 | |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 471 | if (pdata->dws.dma_dev) { |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 472 | dma_cap_mask_t mask; |
| 473 | |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 474 | dma_cap_zero(mask); |
| 475 | dma_cap_set(DMA_SLAVE, mask); |
| 476 | |
Viresh Kumar | e2b35f3 | 2012-02-01 16:12:27 +0530 | [diff] [blame] | 477 | dac->dma.chan = dma_request_channel(mask, filter, &pdata->dws); |
| 478 | if (dac->dma.chan) { |
| 479 | struct dma_slave_config dma_conf = { |
| 480 | .dst_addr = regs->start + DAC_DATA, |
| 481 | .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, |
| 482 | .src_maxburst = 1, |
| 483 | .dst_maxburst = 1, |
| 484 | .direction = DMA_MEM_TO_DEV, |
| 485 | .device_fc = false, |
| 486 | }; |
| 487 | |
| 488 | dmaengine_slave_config(dac->dma.chan, &dma_conf); |
| 489 | } |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 490 | } |
| 491 | if (!pdata->dws.dma_dev || !dac->dma.chan) { |
| 492 | dev_dbg(&pdev->dev, "DMA not available\n"); |
| 493 | retval = -ENODEV; |
Takashi Iwai | a4f2473 | 2014-01-29 14:26:22 +0100 | [diff] [blame] | 494 | goto out_unmap_regs; |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 495 | } |
| 496 | |
| 497 | strcpy(card->driver, "Atmel ABDAC"); |
| 498 | strcpy(card->shortname, "Atmel ABDAC"); |
| 499 | sprintf(card->longname, "Atmel Audio Bitstream DAC"); |
| 500 | |
| 501 | retval = atmel_abdac_pcm_new(dac); |
| 502 | if (retval) { |
| 503 | dev_dbg(&pdev->dev, "could not register ABDAC pcm device\n"); |
| 504 | goto out_release_dma; |
| 505 | } |
| 506 | |
| 507 | retval = snd_card_register(card); |
| 508 | if (retval) { |
| 509 | dev_dbg(&pdev->dev, "could not register sound card\n"); |
| 510 | goto out_release_dma; |
| 511 | } |
| 512 | |
| 513 | platform_set_drvdata(pdev, card); |
| 514 | |
| 515 | dev_info(&pdev->dev, "Atmel ABDAC at 0x%p using %s\n", |
Hans-Christian Egtvedt | 60a56cc | 2009-04-02 08:21:18 +0200 | [diff] [blame] | 516 | dac->regs, dev_name(&dac->dma.chan->dev->device)); |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 517 | |
| 518 | return retval; |
| 519 | |
| 520 | out_release_dma: |
| 521 | dma_release_channel(dac->dma.chan); |
| 522 | dac->dma.chan = NULL; |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 523 | out_unmap_regs: |
| 524 | iounmap(dac->regs); |
| 525 | out_free_card: |
| 526 | snd_card_free(card); |
| 527 | out_put_sample_clk: |
| 528 | clk_put(sample_clk); |
| 529 | clk_disable(pclk); |
| 530 | out_put_pclk: |
| 531 | clk_put(pclk); |
| 532 | return retval; |
| 533 | } |
| 534 | |
Takashi Iwai | d34e4e0 | 2012-08-09 15:47:15 +0200 | [diff] [blame] | 535 | #ifdef CONFIG_PM_SLEEP |
Takashi Iwai | 284e7ca | 2012-07-02 11:22:40 +0200 | [diff] [blame] | 536 | static int atmel_abdac_suspend(struct device *pdev) |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 537 | { |
Takashi Iwai | 284e7ca | 2012-07-02 11:22:40 +0200 | [diff] [blame] | 538 | struct snd_card *card = dev_get_drvdata(pdev); |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 539 | struct atmel_abdac *dac = card->private_data; |
| 540 | |
| 541 | dw_dma_cyclic_stop(dac->dma.chan); |
| 542 | clk_disable(dac->sample_clk); |
| 543 | clk_disable(dac->pclk); |
| 544 | |
| 545 | return 0; |
| 546 | } |
| 547 | |
Takashi Iwai | 284e7ca | 2012-07-02 11:22:40 +0200 | [diff] [blame] | 548 | static int atmel_abdac_resume(struct device *pdev) |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 549 | { |
Takashi Iwai | 284e7ca | 2012-07-02 11:22:40 +0200 | [diff] [blame] | 550 | struct snd_card *card = dev_get_drvdata(pdev); |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 551 | struct atmel_abdac *dac = card->private_data; |
| 552 | |
| 553 | clk_enable(dac->pclk); |
| 554 | clk_enable(dac->sample_clk); |
| 555 | if (test_bit(DMA_READY, &dac->flags)) |
| 556 | dw_dma_cyclic_start(dac->dma.chan); |
| 557 | |
| 558 | return 0; |
| 559 | } |
Takashi Iwai | 284e7ca | 2012-07-02 11:22:40 +0200 | [diff] [blame] | 560 | |
| 561 | static SIMPLE_DEV_PM_OPS(atmel_abdac_pm, atmel_abdac_suspend, atmel_abdac_resume); |
| 562 | #define ATMEL_ABDAC_PM_OPS &atmel_abdac_pm |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 563 | #else |
Takashi Iwai | 284e7ca | 2012-07-02 11:22:40 +0200 | [diff] [blame] | 564 | #define ATMEL_ABDAC_PM_OPS NULL |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 565 | #endif |
| 566 | |
Bill Pemberton | 61dc674 | 2012-12-06 12:35:13 -0500 | [diff] [blame] | 567 | static int atmel_abdac_remove(struct platform_device *pdev) |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 568 | { |
| 569 | struct snd_card *card = platform_get_drvdata(pdev); |
| 570 | struct atmel_abdac *dac = get_dac(card); |
| 571 | |
| 572 | clk_put(dac->sample_clk); |
| 573 | clk_disable(dac->pclk); |
| 574 | clk_put(dac->pclk); |
| 575 | |
| 576 | dma_release_channel(dac->dma.chan); |
| 577 | dac->dma.chan = NULL; |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 578 | iounmap(dac->regs); |
| 579 | free_irq(dac->irq, dac); |
| 580 | snd_card_free(card); |
| 581 | |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 582 | return 0; |
| 583 | } |
| 584 | |
| 585 | static struct platform_driver atmel_abdac_driver = { |
Bill Pemberton | 61dc674 | 2012-12-06 12:35:13 -0500 | [diff] [blame] | 586 | .remove = atmel_abdac_remove, |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 587 | .driver = { |
| 588 | .name = "atmel_abdac", |
Takashi Iwai | 8bf01d8 | 2012-07-02 10:50:24 +0200 | [diff] [blame] | 589 | .owner = THIS_MODULE, |
Takashi Iwai | 284e7ca | 2012-07-02 11:22:40 +0200 | [diff] [blame] | 590 | .pm = ATMEL_ABDAC_PM_OPS, |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 591 | }, |
Hans-Christian Egtvedt | e4967d6 | 2009-02-05 13:10:59 +0100 | [diff] [blame] | 592 | }; |
| 593 | |
| 594 | static int __init atmel_abdac_init(void) |
| 595 | { |
| 596 | return platform_driver_probe(&atmel_abdac_driver, |
| 597 | atmel_abdac_probe); |
| 598 | } |
| 599 | module_init(atmel_abdac_init); |
| 600 | |
| 601 | static void __exit atmel_abdac_exit(void) |
| 602 | { |
| 603 | platform_driver_unregister(&atmel_abdac_driver); |
| 604 | } |
| 605 | module_exit(atmel_abdac_exit); |
| 606 | |
| 607 | MODULE_LICENSE("GPL"); |
| 608 | MODULE_DESCRIPTION("Driver for Atmel Audio Bitstream DAC (ABDAC)"); |
Hans-Christian Egtvedt | 0cfae7c | 2011-06-28 16:59:14 +0200 | [diff] [blame] | 609 | MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); |