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ace36d85 VK |
1 | /* |
2 | * ALSA SoC SPDIF In 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/pcm.h> | |
22 | #include <sound/pcm_params.h> | |
23 | #include <sound/soc.h> | |
24 | #include <sound/spear_dma.h> | |
25 | #include <sound/spear_spdif.h> | |
26 | #include "spdif_in_regs.h" | |
27 | ||
28 | struct spdif_in_params { | |
29 | u32 format; | |
30 | }; | |
31 | ||
32 | struct spdif_in_dev { | |
33 | struct clk *clk; | |
34 | struct spear_dma_data dma_params; | |
35 | struct spdif_in_params saved_params; | |
36 | void *io_base; | |
37 | struct device *dev; | |
38 | void (*reset_perip)(void); | |
39 | int irq; | |
40 | }; | |
41 | ||
42 | static void spdif_in_configure(struct spdif_in_dev *host) | |
43 | { | |
44 | u32 ctrl = SPDIF_IN_PRTYEN | SPDIF_IN_STATEN | SPDIF_IN_USREN | | |
45 | SPDIF_IN_VALEN | SPDIF_IN_BLKEN; | |
46 | ctrl |= SPDIF_MODE_16BIT | SPDIF_FIFO_THRES_16; | |
47 | ||
48 | writel(ctrl, host->io_base + SPDIF_IN_CTRL); | |
49 | writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK); | |
50 | } | |
51 | ||
52 | static int spdif_in_startup(struct snd_pcm_substream *substream, | |
53 | struct snd_soc_dai *cpu_dai) | |
54 | { | |
55 | struct spdif_in_dev *host = snd_soc_dai_get_drvdata(cpu_dai); | |
56 | ||
57 | if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) | |
58 | return -EINVAL; | |
59 | ||
60 | snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)&host->dma_params); | |
61 | return 0; | |
62 | } | |
63 | ||
64 | static void spdif_in_shutdown(struct snd_pcm_substream *substream, | |
65 | struct snd_soc_dai *dai) | |
66 | { | |
67 | struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); | |
68 | ||
69 | if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) | |
70 | return; | |
71 | ||
72 | writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK); | |
73 | snd_soc_dai_set_dma_data(dai, substream, NULL); | |
74 | } | |
75 | ||
76 | static void spdif_in_format(struct spdif_in_dev *host, u32 format) | |
77 | { | |
78 | u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL); | |
79 | ||
80 | switch (format) { | |
81 | case SNDRV_PCM_FORMAT_S16_LE: | |
82 | ctrl |= SPDIF_XTRACT_16BIT; | |
83 | break; | |
84 | ||
85 | case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE: | |
86 | ctrl &= ~SPDIF_XTRACT_16BIT; | |
87 | break; | |
88 | } | |
89 | ||
90 | writel(ctrl, host->io_base + SPDIF_IN_CTRL); | |
91 | } | |
92 | ||
93 | static int spdif_in_hw_params(struct snd_pcm_substream *substream, | |
94 | struct snd_pcm_hw_params *params, | |
95 | struct snd_soc_dai *dai) | |
96 | { | |
97 | struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); | |
98 | u32 format; | |
99 | ||
100 | if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) | |
101 | return -EINVAL; | |
102 | ||
103 | format = params_format(params); | |
104 | host->saved_params.format = format; | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd, | |
110 | struct snd_soc_dai *dai) | |
111 | { | |
112 | struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); | |
113 | u32 ctrl; | |
114 | int ret = 0; | |
115 | ||
116 | if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) | |
117 | return -EINVAL; | |
118 | ||
119 | switch (cmd) { | |
120 | case SNDRV_PCM_TRIGGER_START: | |
121 | case SNDRV_PCM_TRIGGER_RESUME: | |
122 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
123 | clk_enable(host->clk); | |
124 | spdif_in_configure(host); | |
125 | spdif_in_format(host, host->saved_params.format); | |
126 | ||
127 | ctrl = readl(host->io_base + SPDIF_IN_CTRL); | |
128 | ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB; | |
129 | writel(ctrl, host->io_base + SPDIF_IN_CTRL); | |
130 | writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK); | |
131 | break; | |
132 | ||
133 | case SNDRV_PCM_TRIGGER_STOP: | |
134 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
135 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
136 | ctrl = readl(host->io_base + SPDIF_IN_CTRL); | |
137 | ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB); | |
138 | writel(ctrl, host->io_base + SPDIF_IN_CTRL); | |
139 | writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK); | |
140 | ||
141 | if (host->reset_perip) | |
142 | host->reset_perip(); | |
143 | clk_disable(host->clk); | |
144 | break; | |
145 | ||
146 | default: | |
147 | ret = -EINVAL; | |
148 | break; | |
149 | } | |
150 | return ret; | |
151 | } | |
152 | ||
153 | static struct snd_soc_dai_ops spdif_in_dai_ops = { | |
154 | .startup = spdif_in_startup, | |
155 | .shutdown = spdif_in_shutdown, | |
156 | .trigger = spdif_in_trigger, | |
157 | .hw_params = spdif_in_hw_params, | |
158 | }; | |
159 | ||
160 | struct snd_soc_dai_driver spdif_in_dai = { | |
161 | .capture = { | |
162 | .channels_min = 2, | |
163 | .channels_max = 2, | |
164 | .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ | |
165 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \ | |
166 | SNDRV_PCM_RATE_192000), | |
167 | .formats = SNDRV_PCM_FMTBIT_S16_LE | \ | |
168 | SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE, | |
169 | }, | |
170 | .ops = &spdif_in_dai_ops, | |
171 | }; | |
172 | ||
669b4976 KM |
173 | static const struct snd_soc_component_driver spdif_in_component = { |
174 | .name = "spdif-in", | |
175 | }; | |
176 | ||
ace36d85 VK |
177 | static irqreturn_t spdif_in_irq(int irq, void *arg) |
178 | { | |
179 | struct spdif_in_dev *host = (struct spdif_in_dev *)arg; | |
180 | ||
181 | u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ); | |
182 | ||
183 | if (!irq_status) | |
184 | return IRQ_NONE; | |
185 | ||
186 | if (irq_status & SPDIF_IRQ_FIFOWRITE) | |
187 | dev_err(host->dev, "spdif in: fifo write error"); | |
188 | if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD) | |
189 | dev_err(host->dev, "spdif in: empty fifo read error"); | |
190 | if (irq_status & SPDIF_IRQ_FIFOFULL) | |
191 | dev_err(host->dev, "spdif in: fifo full error"); | |
192 | if (irq_status & SPDIF_IRQ_OUTOFRANGE) | |
193 | dev_err(host->dev, "spdif in: out of range error"); | |
194 | ||
195 | writel(0, host->io_base + SPDIF_IN_IRQ); | |
196 | ||
197 | return IRQ_HANDLED; | |
198 | } | |
199 | ||
200 | static int spdif_in_probe(struct platform_device *pdev) | |
201 | { | |
202 | struct spdif_in_dev *host; | |
203 | struct spear_spdif_platform_data *pdata; | |
204 | struct resource *res, *res_fifo; | |
205 | int ret; | |
206 | ||
207 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
208 | if (!res) | |
209 | return -EINVAL; | |
210 | ||
211 | res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
212 | if (!res_fifo) | |
213 | return -EINVAL; | |
214 | ||
215 | if (!devm_request_mem_region(&pdev->dev, res->start, | |
216 | resource_size(res), pdev->name)) { | |
217 | dev_warn(&pdev->dev, "Failed to get memory resourse\n"); | |
218 | return -ENOENT; | |
219 | } | |
220 | ||
221 | host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL); | |
222 | if (!host) { | |
223 | dev_warn(&pdev->dev, "kzalloc fail\n"); | |
224 | return -ENOMEM; | |
225 | } | |
226 | ||
227 | host->io_base = devm_ioremap(&pdev->dev, res->start, | |
228 | resource_size(res)); | |
229 | if (!host->io_base) { | |
230 | dev_warn(&pdev->dev, "ioremap failed\n"); | |
231 | return -ENOMEM; | |
232 | } | |
233 | ||
234 | host->irq = platform_get_irq(pdev, 0); | |
235 | if (host->irq < 0) | |
236 | return -EINVAL; | |
237 | ||
238 | host->clk = clk_get(&pdev->dev, NULL); | |
239 | if (IS_ERR(host->clk)) | |
240 | return PTR_ERR(host->clk); | |
241 | ||
242 | pdata = dev_get_platdata(&pdev->dev); | |
243 | ||
244 | if (!pdata) | |
245 | return -EINVAL; | |
246 | ||
247 | host->dma_params.data = pdata->dma_params; | |
248 | host->dma_params.addr = res_fifo->start; | |
249 | host->dma_params.max_burst = 16; | |
250 | host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
251 | host->dma_params.filter = pdata->filter; | |
252 | host->reset_perip = pdata->reset_perip; | |
253 | ||
254 | host->dev = &pdev->dev; | |
255 | dev_set_drvdata(&pdev->dev, host); | |
256 | ||
257 | ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0, | |
258 | "spdif-in", host); | |
259 | if (ret) { | |
260 | clk_put(host->clk); | |
261 | dev_warn(&pdev->dev, "request_irq failed\n"); | |
262 | return ret; | |
263 | } | |
264 | ||
669b4976 KM |
265 | ret = snd_soc_register_component(&pdev->dev, &spdif_in_component, |
266 | &spdif_in_dai, 1); | |
ace36d85 VK |
267 | if (ret != 0) { |
268 | clk_put(host->clk); | |
269 | return ret; | |
270 | } | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | static int spdif_in_remove(struct platform_device *pdev) | |
276 | { | |
277 | struct spdif_in_dev *host = dev_get_drvdata(&pdev->dev); | |
278 | ||
669b4976 | 279 | snd_soc_unregister_component(&pdev->dev); |
ace36d85 VK |
280 | dev_set_drvdata(&pdev->dev, NULL); |
281 | ||
282 | clk_put(host->clk); | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | ||
288 | static struct platform_driver spdif_in_driver = { | |
289 | .probe = spdif_in_probe, | |
290 | .remove = spdif_in_remove, | |
291 | .driver = { | |
292 | .name = "spdif-in", | |
293 | .owner = THIS_MODULE, | |
294 | }, | |
295 | }; | |
296 | ||
297 | module_platform_driver(spdif_in_driver); | |
298 | ||
299 | MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>"); | |
300 | MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface"); | |
301 | MODULE_LICENSE("GPL"); | |
302 | MODULE_ALIAS("platform:spdif_in"); |