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_pcm_substream *substream) 102 { 103 int err; 104 struct snd_pcm_runtime *runtime = substream->runtime; 105 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 106 const struct mbus_dram_target_info *dram; 107 unsigned long addr; 108 109 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw); 110 111 /* Ensure that all constraints linked to dma burst are fulfilled */ 112 err = snd_pcm_hw_constraint_minmax(runtime, 113 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 114 priv->burst * 2, 115 KIRKWOOD_AUDIO_BUF_MAX-1); 116 if (err < 0) 117 return err; 118 119 err = snd_pcm_hw_constraint_step(runtime, 0, 120 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 121 priv->burst); 122 if (err < 0) 123 return err; 124 125 err = snd_pcm_hw_constraint_step(substream->runtime, 0, 126 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 127 priv->burst); 128 if (err < 0) 129 return err; 130 131 if (!priv->substream_play && !priv->substream_rec) { 132 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED, 133 "kirkwood-i2s", priv); 134 if (err) 135 return -EBUSY; 136 137 /* 138 * Enable Error interrupts. We're only ack'ing them but 139 * it's useful for diagnostics 140 */ 141 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK); 142 } 143 144 dram = mv_mbus_dram_info(); 145 addr = substream->dma_buffer.addr; 146 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 147 if (priv->substream_play) 148 return -EBUSY; 149 priv->substream_play = substream; 150 kirkwood_dma_conf_mbus_windows(priv->io, 151 KIRKWOOD_PLAYBACK_WIN, addr, dram); 152 } else { 153 if (priv->substream_rec) 154 return -EBUSY; 155 priv->substream_rec = substream; 156 kirkwood_dma_conf_mbus_windows(priv->io, 157 KIRKWOOD_RECORD_WIN, addr, dram); 158 } 159 160 return 0; 161 } 162 163 static int kirkwood_dma_close(struct snd_pcm_substream *substream) 164 { 165 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 166 167 if (!priv) 168 return 0; 169 170 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 171 priv->substream_play = NULL; 172 else 173 priv->substream_rec = NULL; 174 175 if (!priv->substream_play && !priv->substream_rec) { 176 writel(0, priv->io + KIRKWOOD_ERR_MASK); 177 free_irq(priv->irq, priv); 178 } 179 180 return 0; 181 } 182 183 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream, 184 struct snd_pcm_hw_params *params) 185 { 186 struct snd_pcm_runtime *runtime = substream->runtime; 187 188 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 189 runtime->dma_bytes = params_buffer_bytes(params); 190 191 return 0; 192 } 193 194 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream) 195 { 196 snd_pcm_set_runtime_buffer(substream, NULL); 197 return 0; 198 } 199 200 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream) 201 { 202 struct snd_pcm_runtime *runtime = substream->runtime; 203 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 204 unsigned long size, count; 205 206 /* compute buffer size in term of "words" as requested in specs */ 207 size = frames_to_bytes(runtime, runtime->buffer_size); 208 size = (size>>2)-1; 209 count = snd_pcm_lib_period_bytes(substream); 210 211 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 212 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT); 213 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR); 214 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE); 215 } else { 216 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT); 217 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR); 218 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE); 219 } 220 221 222 return 0; 223 } 224 225 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream 226 *substream) 227 { 228 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 229 snd_pcm_uframes_t count; 230 231 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 232 count = bytes_to_frames(substream->runtime, 233 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT)); 234 else 235 count = bytes_to_frames(substream->runtime, 236 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT)); 237 238 return count; 239 } 240 241 static const struct snd_pcm_ops kirkwood_dma_ops = { 242 .open = kirkwood_dma_open, 243 .close = kirkwood_dma_close, 244 .ioctl = snd_pcm_lib_ioctl, 245 .hw_params = kirkwood_dma_hw_params, 246 .hw_free = kirkwood_dma_hw_free, 247 .prepare = kirkwood_dma_prepare, 248 .pointer = kirkwood_dma_pointer, 249 }; 250 251 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm, 252 int stream) 253 { 254 struct snd_pcm_substream *substream = pcm->streams[stream].substream; 255 struct snd_dma_buffer *buf = &substream->dma_buffer; 256 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max; 257 258 buf->dev.type = SNDRV_DMA_TYPE_DEV; 259 buf->dev.dev = pcm->card->dev; 260 buf->area = dma_alloc_coherent(pcm->card->dev, size, 261 &buf->addr, GFP_KERNEL); 262 if (!buf->area) 263 return -ENOMEM; 264 buf->bytes = size; 265 buf->private_data = NULL; 266 267 return 0; 268 } 269 270 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd) 271 { 272 struct snd_card *card = rtd->card->snd_card; 273 struct snd_pcm *pcm = rtd->pcm; 274 int ret; 275 276 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 277 if (ret) 278 return ret; 279 280 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 281 ret = kirkwood_dma_preallocate_dma_buffer(pcm, 282 SNDRV_PCM_STREAM_PLAYBACK); 283 if (ret) 284 return ret; 285 } 286 287 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 288 ret = kirkwood_dma_preallocate_dma_buffer(pcm, 289 SNDRV_PCM_STREAM_CAPTURE); 290 if (ret) 291 return ret; 292 } 293 294 return 0; 295 } 296 297 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm) 298 { 299 struct snd_pcm_substream *substream; 300 struct snd_dma_buffer *buf; 301 int stream; 302 303 for (stream = 0; stream < 2; stream++) { 304 substream = pcm->streams[stream].substream; 305 if (!substream) 306 continue; 307 buf = &substream->dma_buffer; 308 if (!buf->area) 309 continue; 310 311 dma_free_coherent(pcm->card->dev, buf->bytes, 312 buf->area, buf->addr); 313 buf->area = NULL; 314 } 315 } 316 317 const struct snd_soc_component_driver kirkwood_soc_component = { 318 .name = DRV_NAME, 319 .ops = &kirkwood_dma_ops, 320 .pcm_new = kirkwood_dma_new, 321 .pcm_free = kirkwood_dma_free_dma_buffers, 322 }; 323