1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * kirkwood-dma.c 4 * 5 * (c) 2010 Arnaud Patard <apatard@mandriva.com> 6 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org> 7 */ 8 9 #include <linux/init.h> 10 #include <linux/module.h> 11 #include <linux/device.h> 12 #include <linux/io.h> 13 #include <linux/slab.h> 14 #include <linux/interrupt.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/mbus.h> 17 #include <sound/soc.h> 18 #include "kirkwood.h" 19 20 static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs) 21 { 22 struct snd_soc_pcm_runtime *soc_runtime = subs->private_data; 23 return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai); 24 } 25 26 static const struct snd_pcm_hardware kirkwood_dma_snd_hw = { 27 .info = SNDRV_PCM_INFO_INTERLEAVED | 28 SNDRV_PCM_INFO_MMAP | 29 SNDRV_PCM_INFO_MMAP_VALID | 30 SNDRV_PCM_INFO_BLOCK_TRANSFER | 31 SNDRV_PCM_INFO_PAUSE | 32 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP, 33 .buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES, 34 .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES, 35 .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES, 36 .periods_min = KIRKWOOD_SND_MIN_PERIODS, 37 .periods_max = KIRKWOOD_SND_MAX_PERIODS, 38 .fifo_size = 0, 39 }; 40 41 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id) 42 { 43 struct kirkwood_dma_data *priv = dev_id; 44 unsigned long mask, status, cause; 45 46 mask = readl(priv->io + KIRKWOOD_INT_MASK); 47 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask; 48 49 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE); 50 if (unlikely(cause)) { 51 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n", 52 __func__, cause); 53 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE); 54 } 55 56 /* we've enabled only bytes interrupts ... */ 57 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \ 58 KIRKWOOD_INT_CAUSE_REC_BYTES)) { 59 printk(KERN_WARNING "%s: unexpected interrupt %lx\n", 60 __func__, status); 61 return IRQ_NONE; 62 } 63 64 /* ack int */ 65 writel(status, priv->io + KIRKWOOD_INT_CAUSE); 66 67 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES) 68 snd_pcm_period_elapsed(priv->substream_play); 69 70 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES) 71 snd_pcm_period_elapsed(priv->substream_rec); 72 73 return IRQ_HANDLED; 74 } 75 76 static void 77 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win, 78 unsigned long dma, 79 const struct mbus_dram_target_info *dram) 80 { 81 int i; 82 83 /* First disable and clear windows */ 84 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); 85 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); 86 87 /* try to find matching cs for current dma address */ 88 for (i = 0; i < dram->num_cs; i++) { 89 const struct mbus_dram_window *cs = dram->cs + i; 90 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) { 91 writel(cs->base & 0xffff0000, 92 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); 93 writel(((cs->size - 1) & 0xffff0000) | 94 (cs->mbus_attr << 8) | 95 (dram->mbus_dram_target_id << 4) | 1, 96 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); 97 } 98 } 99 } 100 101 static int kirkwood_dma_open(struct snd_soc_component *component, 102 struct snd_pcm_substream *substream) 103 { 104 int err; 105 struct snd_pcm_runtime *runtime = substream->runtime; 106 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 107 const struct mbus_dram_target_info *dram; 108 unsigned long addr; 109 110 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw); 111 112 /* Ensure that all constraints linked to dma burst are fulfilled */ 113 err = snd_pcm_hw_constraint_minmax(runtime, 114 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 115 priv->burst * 2, 116 KIRKWOOD_AUDIO_BUF_MAX-1); 117 if (err < 0) 118 return err; 119 120 err = snd_pcm_hw_constraint_step(runtime, 0, 121 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 122 priv->burst); 123 if (err < 0) 124 return err; 125 126 err = snd_pcm_hw_constraint_step(substream->runtime, 0, 127 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128 priv->burst); 129 if (err < 0) 130 return err; 131 132 if (!priv->substream_play && !priv->substream_rec) { 133 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED, 134 "kirkwood-i2s", priv); 135 if (err) 136 return err; 137 138 /* 139 * Enable Error interrupts. We're only ack'ing them but 140 * it's useful for diagnostics 141 */ 142 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK); 143 } 144 145 dram = mv_mbus_dram_info(); 146 addr = substream->dma_buffer.addr; 147 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 148 if (priv->substream_play) 149 return -EBUSY; 150 priv->substream_play = substream; 151 kirkwood_dma_conf_mbus_windows(priv->io, 152 KIRKWOOD_PLAYBACK_WIN, addr, dram); 153 } else { 154 if (priv->substream_rec) 155 return -EBUSY; 156 priv->substream_rec = substream; 157 kirkwood_dma_conf_mbus_windows(priv->io, 158 KIRKWOOD_RECORD_WIN, addr, dram); 159 } 160 161 return 0; 162 } 163 164 static int kirkwood_dma_close(struct snd_soc_component *component, 165 struct snd_pcm_substream *substream) 166 { 167 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 168 169 if (!priv) 170 return 0; 171 172 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 173 priv->substream_play = NULL; 174 else 175 priv->substream_rec = NULL; 176 177 if (!priv->substream_play && !priv->substream_rec) { 178 writel(0, priv->io + KIRKWOOD_ERR_MASK); 179 free_irq(priv->irq, priv); 180 } 181 182 return 0; 183 } 184 185 static int kirkwood_dma_hw_params(struct snd_soc_component *component, 186 struct snd_pcm_substream *substream, 187 struct snd_pcm_hw_params *params) 188 { 189 struct snd_pcm_runtime *runtime = substream->runtime; 190 191 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 192 runtime->dma_bytes = params_buffer_bytes(params); 193 194 return 0; 195 } 196 197 static int kirkwood_dma_hw_free(struct snd_soc_component *component, 198 struct snd_pcm_substream *substream) 199 { 200 snd_pcm_set_runtime_buffer(substream, NULL); 201 return 0; 202 } 203 204 static int kirkwood_dma_prepare(struct snd_soc_component *component, 205 struct snd_pcm_substream *substream) 206 { 207 struct snd_pcm_runtime *runtime = substream->runtime; 208 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 209 unsigned long size, count; 210 211 /* compute buffer size in term of "words" as requested in specs */ 212 size = frames_to_bytes(runtime, runtime->buffer_size); 213 size = (size>>2)-1; 214 count = snd_pcm_lib_period_bytes(substream); 215 216 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 217 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT); 218 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR); 219 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE); 220 } else { 221 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT); 222 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR); 223 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE); 224 } 225 226 227 return 0; 228 } 229 230 static snd_pcm_uframes_t kirkwood_dma_pointer( 231 struct snd_soc_component *component, 232 struct snd_pcm_substream *substream) 233 { 234 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 235 snd_pcm_uframes_t count; 236 237 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 238 count = bytes_to_frames(substream->runtime, 239 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT)); 240 else 241 count = bytes_to_frames(substream->runtime, 242 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT)); 243 244 return count; 245 } 246 247 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm, 248 int stream) 249 { 250 struct snd_pcm_substream *substream = pcm->streams[stream].substream; 251 struct snd_dma_buffer *buf = &substream->dma_buffer; 252 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max; 253 254 buf->dev.type = SNDRV_DMA_TYPE_DEV; 255 buf->dev.dev = pcm->card->dev; 256 buf->area = dma_alloc_coherent(pcm->card->dev, size, 257 &buf->addr, GFP_KERNEL); 258 if (!buf->area) 259 return -ENOMEM; 260 buf->bytes = size; 261 buf->private_data = NULL; 262 263 return 0; 264 } 265 266 static int kirkwood_dma_new(struct snd_soc_component *component, 267 struct snd_soc_pcm_runtime *rtd) 268 { 269 struct snd_card *card = rtd->card->snd_card; 270 struct snd_pcm *pcm = rtd->pcm; 271 int ret; 272 273 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 274 if (ret) 275 return ret; 276 277 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 278 ret = kirkwood_dma_preallocate_dma_buffer(pcm, 279 SNDRV_PCM_STREAM_PLAYBACK); 280 if (ret) 281 return ret; 282 } 283 284 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 285 ret = kirkwood_dma_preallocate_dma_buffer(pcm, 286 SNDRV_PCM_STREAM_CAPTURE); 287 if (ret) 288 return ret; 289 } 290 291 return 0; 292 } 293 294 static void kirkwood_dma_free_dma_buffers(struct snd_soc_component *component, 295 struct snd_pcm *pcm) 296 { 297 struct snd_pcm_substream *substream; 298 struct snd_dma_buffer *buf; 299 int stream; 300 301 for (stream = 0; stream < 2; stream++) { 302 substream = pcm->streams[stream].substream; 303 if (!substream) 304 continue; 305 buf = &substream->dma_buffer; 306 if (!buf->area) 307 continue; 308 309 dma_free_coherent(pcm->card->dev, buf->bytes, 310 buf->area, buf->addr); 311 buf->area = NULL; 312 } 313 } 314 315 const struct snd_soc_component_driver kirkwood_soc_component = { 316 .name = DRV_NAME, 317 .open = kirkwood_dma_open, 318 .close = kirkwood_dma_close, 319 .hw_params = kirkwood_dma_hw_params, 320 .hw_free = kirkwood_dma_hw_free, 321 .prepare = kirkwood_dma_prepare, 322 .pointer = kirkwood_dma_pointer, 323 .pcm_construct = kirkwood_dma_new, 324 .pcm_destruct = kirkwood_dma_free_dma_buffers, 325 }; 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