1 | /* |
2 | * ALSA SoC SPDIF Out Audio Layer for spear processors |
3 | * |
4 | * Copyright (C) 2012 ST Microelectronics |
5 | * Vipin Kumar <vipin.kumar@st.com> |
6 | * |
7 | * This file is licensed under the terms of the GNU General Public |
8 | * License version 2. This program is licensed "as is" without any |
9 | * warranty of any kind, whether express or implied. |
10 | */ |
11 | |
12 | #include <linux/clk.h> |
13 | #include <linux/delay.h> |
14 | #include <linux/device.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/init.h> |
17 | #include <linux/io.h> |
18 | #include <linux/ioport.h> |
19 | #include <linux/module.h> |
20 | #include <linux/platform_device.h> |
21 | #include <sound/dmaengine_pcm.h> |
22 | #include <sound/soc.h> |
23 | #include <sound/spear_dma.h> |
24 | #include <sound/spear_spdif.h> |
25 | #include "spdif_out_regs.h" |
26 | #include "spear_pcm.h" |
27 | |
28 | struct spdif_out_params { |
29 | u32 rate; |
30 | u32 core_freq; |
31 | u32 mute; |
32 | }; |
33 | |
34 | struct spdif_out_dev { |
35 | struct clk *clk; |
36 | struct spear_dma_data dma_params; |
37 | struct spdif_out_params saved_params; |
38 | u32 running; |
39 | void __iomem *io_base; |
40 | struct snd_dmaengine_dai_dma_data dma_params_tx; |
41 | struct snd_dmaengine_pcm_config config; |
42 | }; |
43 | |
44 | static void spdif_out_configure(struct spdif_out_dev *host) |
45 | { |
46 | writel(SPDIF_OUT_RESET, addr: host->io_base + SPDIF_OUT_SOFT_RST); |
47 | mdelay(1); |
48 | writel(readl(addr: host->io_base + SPDIF_OUT_SOFT_RST) & ~SPDIF_OUT_RESET, |
49 | addr: host->io_base + SPDIF_OUT_SOFT_RST); |
50 | |
51 | writel(SPDIF_OUT_FDMA_TRIG_16 | SPDIF_OUT_MEMFMT_16_16 | |
52 | SPDIF_OUT_VALID_HW | SPDIF_OUT_USER_HW | |
53 | SPDIF_OUT_CHNLSTA_HW | SPDIF_OUT_PARITY_HW, |
54 | addr: host->io_base + SPDIF_OUT_CFG); |
55 | |
56 | writel(val: 0x7F, addr: host->io_base + SPDIF_OUT_INT_STA_CLR); |
57 | writel(val: 0x7F, addr: host->io_base + SPDIF_OUT_INT_EN_CLR); |
58 | } |
59 | |
60 | static int spdif_out_startup(struct snd_pcm_substream *substream, |
61 | struct snd_soc_dai *cpu_dai) |
62 | { |
63 | struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai: cpu_dai); |
64 | int ret; |
65 | |
66 | if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) |
67 | return -EINVAL; |
68 | |
69 | ret = clk_enable(clk: host->clk); |
70 | if (ret) |
71 | return ret; |
72 | |
73 | host->running = true; |
74 | spdif_out_configure(host); |
75 | |
76 | return 0; |
77 | } |
78 | |
79 | static void spdif_out_shutdown(struct snd_pcm_substream *substream, |
80 | struct snd_soc_dai *dai) |
81 | { |
82 | struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); |
83 | |
84 | if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) |
85 | return; |
86 | |
87 | clk_disable(clk: host->clk); |
88 | host->running = false; |
89 | } |
90 | |
91 | static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq, |
92 | u32 rate) |
93 | { |
94 | u32 divider, ctrl; |
95 | |
96 | clk_set_rate(clk: host->clk, rate: core_freq); |
97 | divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128)); |
98 | |
99 | ctrl = readl(addr: host->io_base + SPDIF_OUT_CTRL); |
100 | ctrl &= ~SPDIF_DIVIDER_MASK; |
101 | ctrl |= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK; |
102 | writel(val: ctrl, addr: host->io_base + SPDIF_OUT_CTRL); |
103 | } |
104 | |
105 | static int spdif_out_hw_params(struct snd_pcm_substream *substream, |
106 | struct snd_pcm_hw_params *params, |
107 | struct snd_soc_dai *dai) |
108 | { |
109 | struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); |
110 | u32 rate, core_freq; |
111 | |
112 | if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) |
113 | return -EINVAL; |
114 | |
115 | rate = params_rate(p: params); |
116 | |
117 | switch (rate) { |
118 | case 8000: |
119 | case 16000: |
120 | case 32000: |
121 | case 64000: |
122 | /* |
123 | * The clock is multiplied by 10 to bring it to feasible range |
124 | * of frequencies for sscg |
125 | */ |
126 | core_freq = 64000 * 128 * 10; /* 81.92 MHz */ |
127 | break; |
128 | case 5512: |
129 | case 11025: |
130 | case 22050: |
131 | case 44100: |
132 | case 88200: |
133 | case 176400: |
134 | core_freq = 176400 * 128; /* 22.5792 MHz */ |
135 | break; |
136 | case 48000: |
137 | case 96000: |
138 | case 192000: |
139 | default: |
140 | core_freq = 192000 * 128; /* 24.576 MHz */ |
141 | break; |
142 | } |
143 | |
144 | spdif_out_clock(host, core_freq, rate); |
145 | host->saved_params.core_freq = core_freq; |
146 | host->saved_params.rate = rate; |
147 | |
148 | return 0; |
149 | } |
150 | |
151 | static int spdif_out_trigger(struct snd_pcm_substream *substream, int cmd, |
152 | struct snd_soc_dai *dai) |
153 | { |
154 | struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); |
155 | u32 ctrl; |
156 | int ret = 0; |
157 | |
158 | if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) |
159 | return -EINVAL; |
160 | |
161 | switch (cmd) { |
162 | case SNDRV_PCM_TRIGGER_START: |
163 | case SNDRV_PCM_TRIGGER_RESUME: |
164 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
165 | ctrl = readl(addr: host->io_base + SPDIF_OUT_CTRL); |
166 | ctrl &= ~SPDIF_OPMODE_MASK; |
167 | if (!host->saved_params.mute) |
168 | ctrl |= SPDIF_OPMODE_AUD_DATA | |
169 | SPDIF_STATE_NORMAL; |
170 | else |
171 | ctrl |= SPDIF_OPMODE_MUTE_PCM; |
172 | writel(val: ctrl, addr: host->io_base + SPDIF_OUT_CTRL); |
173 | break; |
174 | |
175 | case SNDRV_PCM_TRIGGER_STOP: |
176 | case SNDRV_PCM_TRIGGER_SUSPEND: |
177 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
178 | ctrl = readl(addr: host->io_base + SPDIF_OUT_CTRL); |
179 | ctrl &= ~SPDIF_OPMODE_MASK; |
180 | ctrl |= SPDIF_OPMODE_OFF; |
181 | writel(val: ctrl, addr: host->io_base + SPDIF_OUT_CTRL); |
182 | break; |
183 | |
184 | default: |
185 | ret = -EINVAL; |
186 | break; |
187 | } |
188 | return ret; |
189 | } |
190 | |
191 | static int spdif_mute(struct snd_soc_dai *dai, int mute, int direction) |
192 | { |
193 | struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); |
194 | u32 val; |
195 | |
196 | host->saved_params.mute = mute; |
197 | val = readl(addr: host->io_base + SPDIF_OUT_CTRL); |
198 | val &= ~SPDIF_OPMODE_MASK; |
199 | |
200 | if (mute) |
201 | val |= SPDIF_OPMODE_MUTE_PCM; |
202 | else { |
203 | if (host->running) |
204 | val |= SPDIF_OPMODE_AUD_DATA | SPDIF_STATE_NORMAL; |
205 | else |
206 | val |= SPDIF_OPMODE_OFF; |
207 | } |
208 | |
209 | writel(val, addr: host->io_base + SPDIF_OUT_CTRL); |
210 | return 0; |
211 | } |
212 | |
213 | static int spdif_mute_get(struct snd_kcontrol *kcontrol, |
214 | struct snd_ctl_elem_value *ucontrol) |
215 | { |
216 | struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); |
217 | struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai: cpu_dai); |
218 | |
219 | ucontrol->value.integer.value[0] = host->saved_params.mute; |
220 | return 0; |
221 | } |
222 | |
223 | static int spdif_mute_put(struct snd_kcontrol *kcontrol, |
224 | struct snd_ctl_elem_value *ucontrol) |
225 | { |
226 | struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); |
227 | struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai: cpu_dai); |
228 | |
229 | if (host->saved_params.mute == ucontrol->value.integer.value[0]) |
230 | return 0; |
231 | |
232 | spdif_mute(dai: cpu_dai, mute: ucontrol->value.integer.value[0], |
233 | direction: SNDRV_PCM_STREAM_PLAYBACK); |
234 | |
235 | return 1; |
236 | } |
237 | static const struct snd_kcontrol_new spdif_out_controls[] = { |
238 | SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch" , 0, |
239 | spdif_mute_get, spdif_mute_put), |
240 | }; |
241 | |
242 | static int spdif_soc_dai_probe(struct snd_soc_dai *dai) |
243 | { |
244 | struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); |
245 | |
246 | host->dma_params_tx.filter_data = &host->dma_params; |
247 | |
248 | snd_soc_dai_dma_data_set_playback(dai, &host->dma_params_tx); |
249 | |
250 | return snd_soc_add_dai_controls(dai, controls: spdif_out_controls, |
251 | ARRAY_SIZE(spdif_out_controls)); |
252 | } |
253 | |
254 | static const struct snd_soc_dai_ops spdif_out_dai_ops = { |
255 | .mute_stream = spdif_mute, |
256 | .startup = spdif_out_startup, |
257 | .shutdown = spdif_out_shutdown, |
258 | .trigger = spdif_out_trigger, |
259 | .hw_params = spdif_out_hw_params, |
260 | .no_capture_mute = 1, |
261 | }; |
262 | |
263 | static struct snd_soc_dai_driver spdif_out_dai = { |
264 | .playback = { |
265 | .channels_min = 2, |
266 | .channels_max = 2, |
267 | .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ |
268 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \ |
269 | SNDRV_PCM_RATE_192000), |
270 | .formats = SNDRV_PCM_FMTBIT_S16_LE, |
271 | }, |
272 | .probe = spdif_soc_dai_probe, |
273 | .ops = &spdif_out_dai_ops, |
274 | }; |
275 | |
276 | static const struct snd_soc_component_driver spdif_out_component = { |
277 | .name = "spdif-out" , |
278 | .legacy_dai_naming = 1, |
279 | }; |
280 | |
281 | static int spdif_out_probe(struct platform_device *pdev) |
282 | { |
283 | struct spdif_out_dev *host; |
284 | struct spear_spdif_platform_data *pdata; |
285 | struct resource *res; |
286 | int ret; |
287 | |
288 | host = devm_kzalloc(dev: &pdev->dev, size: sizeof(*host), GFP_KERNEL); |
289 | if (!host) |
290 | return -ENOMEM; |
291 | |
292 | host->io_base = devm_platform_get_and_ioremap_resource(pdev, index: 0, res: &res); |
293 | if (IS_ERR(ptr: host->io_base)) |
294 | return PTR_ERR(ptr: host->io_base); |
295 | |
296 | host->clk = devm_clk_get(dev: &pdev->dev, NULL); |
297 | if (IS_ERR(ptr: host->clk)) |
298 | return PTR_ERR(ptr: host->clk); |
299 | |
300 | pdata = dev_get_platdata(dev: &pdev->dev); |
301 | |
302 | host->dma_params.data = pdata->dma_params; |
303 | host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA; |
304 | host->dma_params.max_burst = 16; |
305 | host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
306 | |
307 | dev_set_drvdata(dev: &pdev->dev, data: host); |
308 | |
309 | ret = devm_snd_soc_register_component(dev: &pdev->dev, component_driver: &spdif_out_component, |
310 | dai_drv: &spdif_out_dai, num_dai: 1); |
311 | if (ret) |
312 | return ret; |
313 | |
314 | return devm_spear_pcm_platform_register(dev: &pdev->dev, config: &host->config, |
315 | filter: pdata->filter); |
316 | } |
317 | |
318 | #ifdef CONFIG_PM |
319 | static int spdif_out_suspend(struct device *dev) |
320 | { |
321 | struct platform_device *pdev = to_platform_device(dev); |
322 | struct spdif_out_dev *host = dev_get_drvdata(dev: &pdev->dev); |
323 | |
324 | if (host->running) |
325 | clk_disable(clk: host->clk); |
326 | |
327 | return 0; |
328 | } |
329 | |
330 | static int spdif_out_resume(struct device *dev) |
331 | { |
332 | struct platform_device *pdev = to_platform_device(dev); |
333 | struct spdif_out_dev *host = dev_get_drvdata(dev: &pdev->dev); |
334 | |
335 | if (host->running) { |
336 | clk_enable(clk: host->clk); |
337 | spdif_out_configure(host); |
338 | spdif_out_clock(host, core_freq: host->saved_params.core_freq, |
339 | rate: host->saved_params.rate); |
340 | } |
341 | return 0; |
342 | } |
343 | |
344 | static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \ |
345 | spdif_out_resume); |
346 | |
347 | #define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops) |
348 | |
349 | #else |
350 | #define SPDIF_OUT_DEV_PM_OPS NULL |
351 | |
352 | #endif |
353 | |
354 | static struct platform_driver spdif_out_driver = { |
355 | .probe = spdif_out_probe, |
356 | .driver = { |
357 | .name = "spdif-out" , |
358 | .pm = SPDIF_OUT_DEV_PM_OPS, |
359 | }, |
360 | }; |
361 | |
362 | module_platform_driver(spdif_out_driver); |
363 | |
364 | MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>" ); |
365 | MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface" ); |
366 | MODULE_LICENSE("GPL" ); |
367 | MODULE_ALIAS("platform:spdif_out" ); |
368 | |