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Linux/sound/soc/kirkwood/kirkwood-dma.c

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  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 

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