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