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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f9b95980 | 2 | /* |
3 | * kirkwood-dma.c | |
4 | * | |
5 | * (c) 2010 Arnaud Patard <apatard@mandriva.com> | |
69737897 | 6 | * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org> |
f9b95980 | 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> | |
f9b95980 | 18 | #include "kirkwood.h" |
19 | ||
a7d09429 RK |
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 | } | |
f9b95980 | 25 | |
636d7e28 | 26 | static const struct snd_pcm_hardware kirkwood_dma_snd_hw = { |
920ec4e5 RK |
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, | |
e4065f3f | 33 | .buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES, |
f9b95980 | 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 | ||
f9b95980 | 41 | static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id) |
42 | { | |
a7d09429 | 43 | struct kirkwood_dma_data *priv = dev_id; |
f9b95980 | 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); | |
f9b95980 | 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) | |
a7d09429 | 68 | snd_pcm_period_elapsed(priv->substream_play); |
f9b95980 | 69 | |
70 | if (status & KIRKWOOD_INT_CAUSE_REC_BYTES) | |
a7d09429 | 71 | snd_pcm_period_elapsed(priv->substream_rec); |
f9b95980 | 72 | |
73 | return IRQ_HANDLED; | |
74 | } | |
75 | ||
63a9332b AL |
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) | |
f9b95980 | 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++) { | |
63a9332b | 89 | const struct mbus_dram_window *cs = dram->cs + i; |
f9b95980 | 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; | |
a7d09429 | 105 | struct kirkwood_dma_data *priv = kirkwood_priv(substream); |
63a9332b | 106 | const struct mbus_dram_target_info *dram; |
f9b95980 | 107 | unsigned long addr; |
108 | ||
f9b95980 | 109 | snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw); |
110 | ||
25985edc | 111 | /* Ensure that all constraints linked to dma burst are fulfilled */ |
f9b95980 | 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 | ||
a7d09429 | 131 | if (!priv->substream_play && !priv->substream_rec) { |
f9b95980 | 132 | err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED, |
a7d09429 RK |
133 | "kirkwood-i2s", priv); |
134 | if (err) | |
f9b95980 | 135 | return -EBUSY; |
f9b95980 | 136 | |
137 | /* | |
138 | * Enable Error interrupts. We're only ack'ing them but | |
25985edc | 139 | * it's useful for diagnostics |
f9b95980 | 140 | */ |
e2c9917b | 141 | writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK); |
f9b95980 | 142 | } |
143 | ||
63a9332b | 144 | dram = mv_mbus_dram_info(); |
ae6a5d37 | 145 | addr = substream->dma_buffer.addr; |
f9b95980 | 146 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
c4a42915 JFM |
147 | if (priv->substream_play) |
148 | return -EBUSY; | |
a7d09429 | 149 | priv->substream_play = substream; |
f9b95980 | 150 | kirkwood_dma_conf_mbus_windows(priv->io, |
63a9332b | 151 | KIRKWOOD_PLAYBACK_WIN, addr, dram); |
f9b95980 | 152 | } else { |
c4a42915 JFM |
153 | if (priv->substream_rec) |
154 | return -EBUSY; | |
a7d09429 | 155 | priv->substream_rec = substream; |
f9b95980 | 156 | kirkwood_dma_conf_mbus_windows(priv->io, |
63a9332b | 157 | KIRKWOOD_RECORD_WIN, addr, dram); |
f9b95980 | 158 | } |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static int kirkwood_dma_close(struct snd_pcm_substream *substream) | |
164 | { | |
a7d09429 | 165 | struct kirkwood_dma_data *priv = kirkwood_priv(substream); |
f9b95980 | 166 | |
a7d09429 | 167 | if (!priv) |
f9b95980 | 168 | return 0; |
169 | ||
170 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
a7d09429 | 171 | priv->substream_play = NULL; |
f9b95980 | 172 | else |
a7d09429 | 173 | priv->substream_rec = NULL; |
f9b95980 | 174 | |
a7d09429 | 175 | if (!priv->substream_play && !priv->substream_rec) { |
f9b95980 | 176 | writel(0, priv->io + KIRKWOOD_ERR_MASK); |
a7d09429 | 177 | free_irq(priv->irq, priv); |
f9b95980 | 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; | |
a7d09429 | 203 | struct kirkwood_dma_data *priv = kirkwood_priv(substream); |
f9b95980 | 204 | unsigned long size, count; |
205 | ||
f9b95980 | 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 | { | |
a7d09429 | 228 | struct kirkwood_dma_data *priv = kirkwood_priv(substream); |
f9b95980 | 229 | snd_pcm_uframes_t count; |
230 | ||
f9b95980 | 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 | ||
115c7254 | 241 | static const struct snd_pcm_ops kirkwood_dma_ops = { |
f9b95980 | 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 | ||
552d1ef6 | 270 | static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd) |
f9b95980 | 271 | { |
552d1ef6 | 272 | struct snd_card *card = rtd->card->snd_card; |
552d1ef6 | 273 | struct snd_pcm *pcm = rtd->pcm; |
f9b95980 | 274 | int ret; |
275 | ||
c9bd5e69 RK |
276 | ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); |
277 | if (ret) | |
278 | return ret; | |
f9b95980 | 279 | |
25e9e756 | 280 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { |
f9b95980 | 281 | ret = kirkwood_dma_preallocate_dma_buffer(pcm, |
282 | SNDRV_PCM_STREAM_PLAYBACK); | |
283 | if (ret) | |
284 | return ret; | |
285 | } | |
286 | ||
25e9e756 | 287 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { |
f9b95980 | 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 | ||
f98fc0f8 KM |
317 | const struct snd_soc_component_driver kirkwood_soc_component = { |
318 | .name = DRV_NAME, | |
f0fba2ad | 319 | .ops = &kirkwood_dma_ops, |
f9b95980 | 320 | .pcm_new = kirkwood_dma_new, |
321 | .pcm_free = kirkwood_dma_free_dma_buffers, | |
322 | }; |