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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1082e270 WZ |
2 | /* |
3 | * Copyright (c) 2010 Nuvoton technology corporation. | |
4 | * | |
5 | * Wan ZongShun <mcuos.com@gmail.com> | |
1082e270 WZ |
6 | */ |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/io.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/dma-mapping.h> | |
14 | ||
15 | #include <sound/core.h> | |
16 | #include <sound/pcm.h> | |
17 | #include <sound/pcm_params.h> | |
18 | #include <sound/soc.h> | |
19 | ||
20 | #include <mach/hardware.h> | |
21 | ||
019afb58 | 22 | #include "nuc900-audio.h" |
1082e270 WZ |
23 | |
24 | static const struct snd_pcm_hardware nuc900_pcm_hardware = { | |
25 | .info = SNDRV_PCM_INFO_INTERLEAVED | | |
26 | SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
27 | SNDRV_PCM_INFO_MMAP | | |
28 | SNDRV_PCM_INFO_MMAP_VALID | | |
29 | SNDRV_PCM_INFO_PAUSE | | |
30 | SNDRV_PCM_INFO_RESUME, | |
1082e270 WZ |
31 | .buffer_bytes_max = 4*1024, |
32 | .period_bytes_min = 1*1024, | |
33 | .period_bytes_max = 4*1024, | |
34 | .periods_min = 1, | |
35 | .periods_max = 1024, | |
36 | }; | |
37 | ||
38 | static int nuc900_dma_hw_params(struct snd_pcm_substream *substream, | |
39 | struct snd_pcm_hw_params *params) | |
40 | { | |
fa41181f | 41 | return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); |
1082e270 WZ |
42 | } |
43 | ||
fa41181f | 44 | static void nuc900_update_dma_register(struct snd_pcm_substream *substream) |
1082e270 WZ |
45 | { |
46 | struct snd_pcm_runtime *runtime = substream->runtime; | |
47 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
48 | void __iomem *mmio_addr, *mmio_len; | |
49 | ||
018334c0 | 50 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
1082e270 WZ |
51 | mmio_addr = nuc900_audio->mmio + ACTL_PDSTB; |
52 | mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH; | |
53 | } else { | |
54 | mmio_addr = nuc900_audio->mmio + ACTL_RDSTB; | |
55 | mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH; | |
56 | } | |
57 | ||
fa41181f LPC |
58 | AUDIO_WRITE(mmio_addr, runtime->dma_addr); |
59 | AUDIO_WRITE(mmio_len, runtime->dma_bytes); | |
1082e270 WZ |
60 | } |
61 | ||
62 | static void nuc900_dma_start(struct snd_pcm_substream *substream) | |
63 | { | |
64 | struct snd_pcm_runtime *runtime = substream->runtime; | |
65 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
66 | unsigned long val; | |
67 | ||
68 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); | |
69 | val |= (T_DMA_IRQ | R_DMA_IRQ); | |
70 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val); | |
71 | } | |
72 | ||
73 | static void nuc900_dma_stop(struct snd_pcm_substream *substream) | |
74 | { | |
75 | struct snd_pcm_runtime *runtime = substream->runtime; | |
76 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
77 | unsigned long val; | |
78 | ||
79 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); | |
80 | val &= ~(T_DMA_IRQ | R_DMA_IRQ); | |
81 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val); | |
82 | } | |
83 | ||
84 | static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id) | |
85 | { | |
86 | struct snd_pcm_substream *substream = dev_id; | |
87 | struct nuc900_audio *nuc900_audio = substream->runtime->private_data; | |
88 | unsigned long val; | |
89 | ||
90 | spin_lock(&nuc900_audio->lock); | |
91 | ||
92 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); | |
93 | ||
94 | if (val & R_DMA_IRQ) { | |
95 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ); | |
96 | ||
97 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR); | |
98 | ||
99 | if (val & R_DMA_MIDDLE_IRQ) { | |
100 | val |= R_DMA_MIDDLE_IRQ; | |
101 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val); | |
102 | } | |
103 | ||
104 | if (val & R_DMA_END_IRQ) { | |
105 | val |= R_DMA_END_IRQ; | |
106 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val); | |
107 | } | |
108 | } else if (val & T_DMA_IRQ) { | |
109 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ); | |
110 | ||
111 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR); | |
112 | ||
113 | if (val & P_DMA_MIDDLE_IRQ) { | |
114 | val |= P_DMA_MIDDLE_IRQ; | |
115 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val); | |
116 | } | |
117 | ||
118 | if (val & P_DMA_END_IRQ) { | |
119 | val |= P_DMA_END_IRQ; | |
120 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val); | |
121 | } | |
122 | } else { | |
123 | dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n"); | |
124 | spin_unlock(&nuc900_audio->lock); | |
125 | return IRQ_HANDLED; | |
126 | } | |
127 | ||
128 | spin_unlock(&nuc900_audio->lock); | |
129 | ||
130 | snd_pcm_period_elapsed(substream); | |
131 | ||
132 | return IRQ_HANDLED; | |
133 | } | |
134 | ||
135 | static int nuc900_dma_hw_free(struct snd_pcm_substream *substream) | |
136 | { | |
137 | snd_pcm_lib_free_pages(substream); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | static int nuc900_dma_prepare(struct snd_pcm_substream *substream) | |
142 | { | |
143 | struct snd_pcm_runtime *runtime = substream->runtime; | |
144 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
018334c0 | 145 | unsigned long flags, val; |
3f1af9d2 | 146 | int ret = 0; |
1082e270 WZ |
147 | |
148 | spin_lock_irqsave(&nuc900_audio->lock, flags); | |
149 | ||
fa41181f | 150 | nuc900_update_dma_register(substream); |
1082e270 WZ |
151 | |
152 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); | |
153 | ||
154 | switch (runtime->channels) { | |
155 | case 1: | |
018334c0 | 156 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
1082e270 WZ |
157 | val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL); |
158 | val |= PLAY_RIGHT_CHNNEL; | |
159 | } else { | |
160 | val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL); | |
161 | val |= RECORD_RIGHT_CHNNEL; | |
162 | } | |
163 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); | |
164 | break; | |
165 | case 2: | |
018334c0 | 166 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
1082e270 WZ |
167 | val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL); |
168 | else | |
169 | val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL); | |
170 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); | |
171 | break; | |
172 | default: | |
3f1af9d2 | 173 | ret = -EINVAL; |
1082e270 WZ |
174 | } |
175 | spin_unlock_irqrestore(&nuc900_audio->lock, flags); | |
3f1af9d2 | 176 | return ret; |
1082e270 WZ |
177 | } |
178 | ||
179 | static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd) | |
180 | { | |
181 | int ret = 0; | |
182 | ||
183 | switch (cmd) { | |
184 | case SNDRV_PCM_TRIGGER_START: | |
185 | case SNDRV_PCM_TRIGGER_RESUME: | |
186 | nuc900_dma_start(substream); | |
187 | break; | |
188 | ||
189 | case SNDRV_PCM_TRIGGER_STOP: | |
190 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
191 | nuc900_dma_stop(substream); | |
192 | break; | |
193 | ||
194 | default: | |
195 | ret = -EINVAL; | |
196 | break; | |
197 | } | |
198 | ||
199 | return ret; | |
200 | } | |
201 | ||
49acf73b | 202 | static int nuc900_dma_getposition(struct snd_pcm_substream *substream, |
1082e270 WZ |
203 | dma_addr_t *src, dma_addr_t *dst) |
204 | { | |
205 | struct snd_pcm_runtime *runtime = substream->runtime; | |
206 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
207 | ||
208 | if (src != NULL) | |
209 | *src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC); | |
210 | ||
211 | if (dst != NULL) | |
212 | *dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream) | |
218 | { | |
219 | struct snd_pcm_runtime *runtime = substream->runtime; | |
220 | dma_addr_t src, dst; | |
221 | unsigned long res; | |
222 | ||
223 | nuc900_dma_getposition(substream, &src, &dst); | |
224 | ||
225 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) | |
226 | res = dst - runtime->dma_addr; | |
227 | else | |
228 | res = src - runtime->dma_addr; | |
229 | ||
230 | return bytes_to_frames(substream->runtime, res); | |
231 | } | |
232 | ||
233 | static int nuc900_dma_open(struct snd_pcm_substream *substream) | |
234 | { | |
235 | struct snd_pcm_runtime *runtime = substream->runtime; | |
236 | struct nuc900_audio *nuc900_audio; | |
237 | ||
238 | snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware); | |
239 | ||
240 | nuc900_audio = nuc900_ac97_data; | |
241 | ||
242 | if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt, | |
88e24c3a | 243 | 0, "nuc900-dma", substream)) |
1082e270 WZ |
244 | return -EBUSY; |
245 | ||
246 | runtime->private_data = nuc900_audio; | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | static int nuc900_dma_close(struct snd_pcm_substream *substream) | |
252 | { | |
253 | struct snd_pcm_runtime *runtime = substream->runtime; | |
254 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
255 | ||
256 | free_irq(nuc900_audio->irq_num, substream); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static int nuc900_dma_mmap(struct snd_pcm_substream *substream, | |
262 | struct vm_area_struct *vma) | |
263 | { | |
264 | struct snd_pcm_runtime *runtime = substream->runtime; | |
265 | ||
f6e45661 LR |
266 | return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area, |
267 | runtime->dma_addr, runtime->dma_bytes); | |
1082e270 WZ |
268 | } |
269 | ||
f70eab3a | 270 | static const struct snd_pcm_ops nuc900_dma_ops = { |
1082e270 WZ |
271 | .open = nuc900_dma_open, |
272 | .close = nuc900_dma_close, | |
273 | .ioctl = snd_pcm_lib_ioctl, | |
274 | .hw_params = nuc900_dma_hw_params, | |
275 | .hw_free = nuc900_dma_hw_free, | |
276 | .prepare = nuc900_dma_prepare, | |
277 | .trigger = nuc900_dma_trigger, | |
278 | .pointer = nuc900_dma_pointer, | |
279 | .mmap = nuc900_dma_mmap, | |
280 | }; | |
281 | ||
552d1ef6 | 282 | static int nuc900_dma_new(struct snd_soc_pcm_runtime *rtd) |
1082e270 | 283 | { |
552d1ef6 | 284 | struct snd_card *card = rtd->card->snd_card; |
552d1ef6 | 285 | struct snd_pcm *pcm = rtd->pcm; |
c9bd5e69 | 286 | int ret; |
552d1ef6 | 287 | |
c9bd5e69 RK |
288 | ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); |
289 | if (ret) | |
290 | return ret; | |
1082e270 WZ |
291 | |
292 | snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, | |
293 | card->dev, 4 * 1024, (4 * 1024) - 1); | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
bab9dc53 | 298 | static const struct snd_soc_component_driver nuc900_soc_component = { |
f0fba2ad | 299 | .ops = &nuc900_dma_ops, |
1082e270 | 300 | .pcm_new = nuc900_dma_new, |
a7a9820b | 301 | }; |
1082e270 | 302 | |
ce69ace5 | 303 | static int nuc900_soc_platform_probe(struct platform_device *pdev) |
1082e270 | 304 | { |
bab9dc53 KM |
305 | return devm_snd_soc_register_component(&pdev->dev, &nuc900_soc_component, |
306 | NULL, 0); | |
1082e270 WZ |
307 | } |
308 | ||
f0fba2ad LG |
309 | static struct platform_driver nuc900_pcm_driver = { |
310 | .driver = { | |
311 | .name = "nuc900-pcm-audio", | |
f0fba2ad LG |
312 | }, |
313 | ||
314 | .probe = nuc900_soc_platform_probe, | |
f0fba2ad LG |
315 | }; |
316 | ||
d0efa6a2 | 317 | module_platform_driver(nuc900_pcm_driver); |
1082e270 WZ |
318 | |
319 | MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>"); | |
320 | MODULE_DESCRIPTION("nuc900 Audio DMA module"); | |
321 | MODULE_LICENSE("GPL"); |