1 /* 2 * kirkwood-dma.c 3 * 4 * (c) 2010 Arnaud Patard <apatard@mandriva.com> 5 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 */ 12 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/device.h> 16 #include <linux/io.h> 17 #include <linux/slab.h> 18 #include <linux/interrupt.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/mbus.h> 21 #include <sound/soc.h> 22 #include "kirkwood.h" 23 24 #define KIRKWOOD_RATES \ 25 (SNDRV_PCM_RATE_8000_192000 | \ 26 SNDRV_PCM_RATE_CONTINUOUS | \ 27 SNDRV_PCM_RATE_KNOT) 28 29 #define KIRKWOOD_FORMATS \ 30 (SNDRV_PCM_FMTBIT_S16_LE | \ 31 SNDRV_PCM_FMTBIT_S24_LE | \ 32 SNDRV_PCM_FMTBIT_S32_LE | \ 33 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE | \ 34 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE) 35 36 static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs) 37 { 38 struct snd_soc_pcm_runtime *soc_runtime = subs->private_data; 39 return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai); 40 } 41 42 static struct snd_pcm_hardware kirkwood_dma_snd_hw = { 43 .info = (SNDRV_PCM_INFO_INTERLEAVED | 44 SNDRV_PCM_INFO_MMAP | 45 SNDRV_PCM_INFO_MMAP_VALID | 46 SNDRV_PCM_INFO_BLOCK_TRANSFER | 47 SNDRV_PCM_INFO_PAUSE), 48 .formats = KIRKWOOD_FORMATS, 49 .rates = KIRKWOOD_RATES, 50 .rate_min = 8000, 51 .rate_max = 384000, 52 .channels_min = 1, 53 .channels_max = 8, 54 .buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES, 55 .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES, 56 .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES, 57 .periods_min = KIRKWOOD_SND_MIN_PERIODS, 58 .periods_max = KIRKWOOD_SND_MAX_PERIODS, 59 .fifo_size = 0, 60 }; 61 62 static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32); 63 64 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id) 65 { 66 struct kirkwood_dma_data *priv = dev_id; 67 unsigned long mask, status, cause; 68 69 mask = readl(priv->io + KIRKWOOD_INT_MASK); 70 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask; 71 72 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE); 73 if (unlikely(cause)) { 74 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n", 75 __func__, cause); 76 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE); 77 } 78 79 /* we've enabled only bytes interrupts ... */ 80 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \ 81 KIRKWOOD_INT_CAUSE_REC_BYTES)) { 82 printk(KERN_WARNING "%s: unexpected interrupt %lx\n", 83 __func__, status); 84 return IRQ_NONE; 85 } 86 87 /* ack int */ 88 writel(status, priv->io + KIRKWOOD_INT_CAUSE); 89 90 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES) 91 snd_pcm_period_elapsed(priv->substream_play); 92 93 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES) 94 snd_pcm_period_elapsed(priv->substream_rec); 95 96 return IRQ_HANDLED; 97 } 98 99 static void 100 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win, 101 unsigned long dma, 102 const struct mbus_dram_target_info *dram) 103 { 104 int i; 105 106 /* First disable and clear windows */ 107 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); 108 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); 109 110 /* try to find matching cs for current dma address */ 111 for (i = 0; i < dram->num_cs; i++) { 112 const struct mbus_dram_window *cs = dram->cs + i; 113 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) { 114 writel(cs->base & 0xffff0000, 115 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); 116 writel(((cs->size - 1) & 0xffff0000) | 117 (cs->mbus_attr << 8) | 118 (dram->mbus_dram_target_id << 4) | 1, 119 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); 120 } 121 } 122 } 123 124 static int kirkwood_dma_open(struct snd_pcm_substream *substream) 125 { 126 int err; 127 struct snd_pcm_runtime *runtime = substream->runtime; 128 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 129 const struct mbus_dram_target_info *dram; 130 unsigned long addr; 131 132 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw); 133 134 /* Ensure that all constraints linked to dma burst are fulfilled */ 135 err = snd_pcm_hw_constraint_minmax(runtime, 136 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 137 priv->burst * 2, 138 KIRKWOOD_AUDIO_BUF_MAX-1); 139 if (err < 0) 140 return err; 141 142 err = snd_pcm_hw_constraint_step(runtime, 0, 143 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 144 priv->burst); 145 if (err < 0) 146 return err; 147 148 err = snd_pcm_hw_constraint_step(substream->runtime, 0, 149 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 150 priv->burst); 151 if (err < 0) 152 return err; 153 154 if (!priv->substream_play && !priv->substream_rec) { 155 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED, 156 "kirkwood-i2s", priv); 157 if (err) 158 return -EBUSY; 159 160 /* 161 * Enable Error interrupts. We're only ack'ing them but 162 * it's useful for diagnostics 163 */ 164 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK); 165 } 166 167 dram = mv_mbus_dram_info(); 168 addr = substream->dma_buffer.addr; 169 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 170 priv->substream_play = substream; 171 kirkwood_dma_conf_mbus_windows(priv->io, 172 KIRKWOOD_PLAYBACK_WIN, addr, dram); 173 } else { 174 priv->substream_rec = substream; 175 kirkwood_dma_conf_mbus_windows(priv->io, 176 KIRKWOOD_RECORD_WIN, addr, dram); 177 } 178 179 return 0; 180 } 181 182 static int kirkwood_dma_close(struct snd_pcm_substream *substream) 183 { 184 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 185 186 if (!priv) 187 return 0; 188 189 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 190 priv->substream_play = NULL; 191 else 192 priv->substream_rec = NULL; 193 194 if (!priv->substream_play && !priv->substream_rec) { 195 writel(0, priv->io + KIRKWOOD_ERR_MASK); 196 free_irq(priv->irq, priv); 197 } 198 199 return 0; 200 } 201 202 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream, 203 struct snd_pcm_hw_params *params) 204 { 205 struct snd_pcm_runtime *runtime = substream->runtime; 206 207 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 208 runtime->dma_bytes = params_buffer_bytes(params); 209 210 return 0; 211 } 212 213 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream) 214 { 215 snd_pcm_set_runtime_buffer(substream, NULL); 216 return 0; 217 } 218 219 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream) 220 { 221 struct snd_pcm_runtime *runtime = substream->runtime; 222 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 223 unsigned long size, count; 224 225 /* compute buffer size in term of "words" as requested in specs */ 226 size = frames_to_bytes(runtime, runtime->buffer_size); 227 size = (size>>2)-1; 228 count = snd_pcm_lib_period_bytes(substream); 229 230 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 231 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT); 232 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR); 233 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE); 234 } else { 235 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT); 236 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR); 237 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE); 238 } 239 240 241 return 0; 242 } 243 244 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream 245 *substream) 246 { 247 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 248 snd_pcm_uframes_t count; 249 250 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 251 count = bytes_to_frames(substream->runtime, 252 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT)); 253 else 254 count = bytes_to_frames(substream->runtime, 255 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT)); 256 257 return count; 258 } 259 260 static struct snd_pcm_ops kirkwood_dma_ops = { 261 .open = kirkwood_dma_open, 262 .close = kirkwood_dma_close, 263 .ioctl = snd_pcm_lib_ioctl, 264 .hw_params = kirkwood_dma_hw_params, 265 .hw_free = kirkwood_dma_hw_free, 266 .prepare = kirkwood_dma_prepare, 267 .pointer = kirkwood_dma_pointer, 268 }; 269 270 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm, 271 int stream) 272 { 273 struct snd_pcm_substream *substream = pcm->streams[stream].substream; 274 struct snd_dma_buffer *buf = &substream->dma_buffer; 275 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max; 276 277 buf->dev.type = SNDRV_DMA_TYPE_DEV; 278 buf->dev.dev = pcm->card->dev; 279 buf->area = dma_alloc_coherent(pcm->card->dev, size, 280 &buf->addr, GFP_KERNEL); 281 if (!buf->area) 282 return -ENOMEM; 283 buf->bytes = size; 284 buf->private_data = NULL; 285 286 return 0; 287 } 288 289 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd) 290 { 291 struct snd_card *card = rtd->card->snd_card; 292 struct snd_pcm *pcm = rtd->pcm; 293 int ret; 294 295 if (!card->dev->dma_mask) 296 card->dev->dma_mask = &kirkwood_dma_dmamask; 297 if (!card->dev->coherent_dma_mask) 298 card->dev->coherent_dma_mask = DMA_BIT_MASK(32); 299 300 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 301 ret = kirkwood_dma_preallocate_dma_buffer(pcm, 302 SNDRV_PCM_STREAM_PLAYBACK); 303 if (ret) 304 return ret; 305 } 306 307 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 308 ret = kirkwood_dma_preallocate_dma_buffer(pcm, 309 SNDRV_PCM_STREAM_CAPTURE); 310 if (ret) 311 return ret; 312 } 313 314 return 0; 315 } 316 317 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm) 318 { 319 struct snd_pcm_substream *substream; 320 struct snd_dma_buffer *buf; 321 int stream; 322 323 for (stream = 0; stream < 2; stream++) { 324 substream = pcm->streams[stream].substream; 325 if (!substream) 326 continue; 327 buf = &substream->dma_buffer; 328 if (!buf->area) 329 continue; 330 331 dma_free_coherent(pcm->card->dev, buf->bytes, 332 buf->area, buf->addr); 333 buf->area = NULL; 334 } 335 } 336 337 struct snd_soc_platform_driver kirkwood_soc_platform = { 338 .ops = &kirkwood_dma_ops, 339 .pcm_new = kirkwood_dma_new, 340 .pcm_free = kirkwood_dma_free_dma_buffers, 341 }; 342