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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 | ||
46fdd8b1 | 52 | static int spdif_in_dai_probe(struct snd_soc_dai *dai) |
ace36d85 | 53 | { |
46fdd8b1 | 54 | struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); |
ace36d85 | 55 | |
46fdd8b1 | 56 | dai->capture_dma_data = &host->dma_params; |
ace36d85 | 57 | |
ace36d85 VK |
58 | return 0; |
59 | } | |
60 | ||
61 | static void spdif_in_shutdown(struct snd_pcm_substream *substream, | |
62 | struct snd_soc_dai *dai) | |
63 | { | |
64 | struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); | |
65 | ||
66 | if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) | |
67 | return; | |
68 | ||
69 | writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK); | |
ace36d85 VK |
70 | } |
71 | ||
72 | static void spdif_in_format(struct spdif_in_dev *host, u32 format) | |
73 | { | |
74 | u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL); | |
75 | ||
76 | switch (format) { | |
77 | case SNDRV_PCM_FORMAT_S16_LE: | |
78 | ctrl |= SPDIF_XTRACT_16BIT; | |
79 | break; | |
80 | ||
81 | case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE: | |
82 | ctrl &= ~SPDIF_XTRACT_16BIT; | |
83 | break; | |
84 | } | |
85 | ||
86 | writel(ctrl, host->io_base + SPDIF_IN_CTRL); | |
87 | } | |
88 | ||
89 | static int spdif_in_hw_params(struct snd_pcm_substream *substream, | |
90 | struct snd_pcm_hw_params *params, | |
91 | struct snd_soc_dai *dai) | |
92 | { | |
93 | struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); | |
94 | u32 format; | |
95 | ||
96 | if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) | |
97 | return -EINVAL; | |
98 | ||
99 | format = params_format(params); | |
100 | host->saved_params.format = format; | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd, | |
106 | struct snd_soc_dai *dai) | |
107 | { | |
108 | struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); | |
109 | u32 ctrl; | |
110 | int ret = 0; | |
111 | ||
112 | if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) | |
113 | return -EINVAL; | |
114 | ||
115 | switch (cmd) { | |
116 | case SNDRV_PCM_TRIGGER_START: | |
117 | case SNDRV_PCM_TRIGGER_RESUME: | |
118 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
119 | clk_enable(host->clk); | |
120 | spdif_in_configure(host); | |
121 | spdif_in_format(host, host->saved_params.format); | |
122 | ||
123 | ctrl = readl(host->io_base + SPDIF_IN_CTRL); | |
124 | ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB; | |
125 | writel(ctrl, host->io_base + SPDIF_IN_CTRL); | |
126 | writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK); | |
127 | break; | |
128 | ||
129 | case SNDRV_PCM_TRIGGER_STOP: | |
130 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
131 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
132 | ctrl = readl(host->io_base + SPDIF_IN_CTRL); | |
133 | ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB); | |
134 | writel(ctrl, host->io_base + SPDIF_IN_CTRL); | |
135 | writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK); | |
136 | ||
137 | if (host->reset_perip) | |
138 | host->reset_perip(); | |
139 | clk_disable(host->clk); | |
140 | break; | |
141 | ||
142 | default: | |
143 | ret = -EINVAL; | |
144 | break; | |
145 | } | |
146 | return ret; | |
147 | } | |
148 | ||
149 | static struct snd_soc_dai_ops spdif_in_dai_ops = { | |
ace36d85 VK |
150 | .shutdown = spdif_in_shutdown, |
151 | .trigger = spdif_in_trigger, | |
152 | .hw_params = spdif_in_hw_params, | |
153 | }; | |
154 | ||
155 | struct snd_soc_dai_driver spdif_in_dai = { | |
46fdd8b1 | 156 | .probe = spdif_in_dai_probe, |
ace36d85 VK |
157 | .capture = { |
158 | .channels_min = 2, | |
159 | .channels_max = 2, | |
160 | .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ | |
161 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \ | |
162 | SNDRV_PCM_RATE_192000), | |
163 | .formats = SNDRV_PCM_FMTBIT_S16_LE | \ | |
164 | SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE, | |
165 | }, | |
166 | .ops = &spdif_in_dai_ops, | |
167 | }; | |
168 | ||
669b4976 KM |
169 | static const struct snd_soc_component_driver spdif_in_component = { |
170 | .name = "spdif-in", | |
171 | }; | |
172 | ||
ace36d85 VK |
173 | static irqreturn_t spdif_in_irq(int irq, void *arg) |
174 | { | |
175 | struct spdif_in_dev *host = (struct spdif_in_dev *)arg; | |
176 | ||
177 | u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ); | |
178 | ||
179 | if (!irq_status) | |
180 | return IRQ_NONE; | |
181 | ||
182 | if (irq_status & SPDIF_IRQ_FIFOWRITE) | |
183 | dev_err(host->dev, "spdif in: fifo write error"); | |
184 | if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD) | |
185 | dev_err(host->dev, "spdif in: empty fifo read error"); | |
186 | if (irq_status & SPDIF_IRQ_FIFOFULL) | |
187 | dev_err(host->dev, "spdif in: fifo full error"); | |
188 | if (irq_status & SPDIF_IRQ_OUTOFRANGE) | |
189 | dev_err(host->dev, "spdif in: out of range error"); | |
190 | ||
191 | writel(0, host->io_base + SPDIF_IN_IRQ); | |
192 | ||
193 | return IRQ_HANDLED; | |
194 | } | |
195 | ||
196 | static int spdif_in_probe(struct platform_device *pdev) | |
197 | { | |
198 | struct spdif_in_dev *host; | |
199 | struct spear_spdif_platform_data *pdata; | |
200 | struct resource *res, *res_fifo; | |
201 | int ret; | |
202 | ||
203 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
204 | if (!res) | |
205 | return -EINVAL; | |
206 | ||
207 | res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
208 | if (!res_fifo) | |
209 | return -EINVAL; | |
210 | ||
211 | if (!devm_request_mem_region(&pdev->dev, res->start, | |
212 | resource_size(res), pdev->name)) { | |
213 | dev_warn(&pdev->dev, "Failed to get memory resourse\n"); | |
214 | return -ENOENT; | |
215 | } | |
216 | ||
217 | host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL); | |
218 | if (!host) { | |
219 | dev_warn(&pdev->dev, "kzalloc fail\n"); | |
220 | return -ENOMEM; | |
221 | } | |
222 | ||
223 | host->io_base = devm_ioremap(&pdev->dev, res->start, | |
224 | resource_size(res)); | |
225 | if (!host->io_base) { | |
226 | dev_warn(&pdev->dev, "ioremap failed\n"); | |
227 | return -ENOMEM; | |
228 | } | |
229 | ||
230 | host->irq = platform_get_irq(pdev, 0); | |
231 | if (host->irq < 0) | |
232 | return -EINVAL; | |
233 | ||
bfcc74e6 | 234 | host->clk = devm_clk_get(&pdev->dev, NULL); |
ace36d85 VK |
235 | if (IS_ERR(host->clk)) |
236 | return PTR_ERR(host->clk); | |
237 | ||
238 | pdata = dev_get_platdata(&pdev->dev); | |
239 | ||
240 | if (!pdata) | |
241 | return -EINVAL; | |
242 | ||
243 | host->dma_params.data = pdata->dma_params; | |
244 | host->dma_params.addr = res_fifo->start; | |
245 | host->dma_params.max_burst = 16; | |
246 | host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
247 | host->dma_params.filter = pdata->filter; | |
248 | host->reset_perip = pdata->reset_perip; | |
249 | ||
250 | host->dev = &pdev->dev; | |
251 | dev_set_drvdata(&pdev->dev, host); | |
252 | ||
253 | ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0, | |
254 | "spdif-in", host); | |
255 | if (ret) { | |
ace36d85 VK |
256 | dev_warn(&pdev->dev, "request_irq failed\n"); |
257 | return ret; | |
258 | } | |
259 | ||
669b4976 KM |
260 | ret = snd_soc_register_component(&pdev->dev, &spdif_in_component, |
261 | &spdif_in_dai, 1); | |
ace36d85 VK |
262 | if (ret != 0) { |
263 | clk_put(host->clk); | |
264 | return ret; | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static int spdif_in_remove(struct platform_device *pdev) | |
271 | { | |
272 | struct spdif_in_dev *host = dev_get_drvdata(&pdev->dev); | |
273 | ||
669b4976 | 274 | snd_soc_unregister_component(&pdev->dev); |
ace36d85 VK |
275 | |
276 | return 0; | |
277 | } | |
278 | ||
ace36d85 VK |
279 | static struct platform_driver spdif_in_driver = { |
280 | .probe = spdif_in_probe, | |
281 | .remove = spdif_in_remove, | |
282 | .driver = { | |
283 | .name = "spdif-in", | |
284 | .owner = THIS_MODULE, | |
285 | }, | |
286 | }; | |
287 | ||
288 | module_platform_driver(spdif_in_driver); | |
289 | ||
290 | MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>"); | |
291 | MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface"); | |
292 | MODULE_LICENSE("GPL"); | |
293 | MODULE_ALIAS("platform:spdif_in"); |