2 * Au1000/Au1500/Au1100 I2S controller driver for ASoC
4 * (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
6 * Note: clock supplied to the I2S controller must be 256x samplerate.
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/suspend.h>
13 #include <sound/core.h>
14 #include <sound/pcm.h>
15 #include <sound/initval.h>
16 #include <sound/soc.h>
17 #include <asm/mach-au1x00/au1000.h>
23 #define I2S_ENABLE 0x08
25 #define CFG_XU (1 << 25) /* tx underflow */
26 #define CFG_XO (1 << 24)
27 #define CFG_RU (1 << 23)
28 #define CFG_RO (1 << 22)
29 #define CFG_TR (1 << 21)
30 #define CFG_TE (1 << 20)
31 #define CFG_TF (1 << 19)
32 #define CFG_RR (1 << 18)
33 #define CFG_RF (1 << 17)
34 #define CFG_ICK (1 << 12) /* clock invert */
35 #define CFG_PD (1 << 11) /* set to make I2SDIO INPUT */
36 #define CFG_LB (1 << 10) /* loopback */
37 #define CFG_IC (1 << 9) /* word select invert */
38 #define CFG_FM_I2S (0 << 7) /* I2S format */
39 #define CFG_FM_LJ (1 << 7) /* left-justified */
40 #define CFG_FM_RJ (2 << 7) /* right-justified */
41 #define CFG_FM_MASK (3 << 7)
42 #define CFG_TN (1 << 6) /* tx fifo en */
43 #define CFG_RN (1 << 5) /* rx fifo en */
44 #define CFG_SZ_8 (0x08)
45 #define CFG_SZ_16 (0x10)
46 #define CFG_SZ_18 (0x12)
47 #define CFG_SZ_20 (0x14)
48 #define CFG_SZ_24 (0x18)
49 #define CFG_SZ_MASK (0x1f)
50 #define EN_D (1 << 1) /* DISable */
51 #define EN_CE (1 << 0) /* clock enable */
53 /* only limited by clock generator and board design */
54 #define AU1XI2SC_RATES \
55 SNDRV_PCM_RATE_CONTINUOUS
57 #define AU1XI2SC_FMTS \
58 (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 | \
59 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \
60 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE | \
61 SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_U18_3LE | \
62 SNDRV_PCM_FMTBIT_S18_3BE | SNDRV_PCM_FMTBIT_U18_3BE | \
63 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_U20_3LE | \
64 SNDRV_PCM_FMTBIT_S20_3BE | SNDRV_PCM_FMTBIT_U20_3BE | \
65 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE | \
66 SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_U24_BE | \
69 static inline unsigned long RD(struct au1xpsc_audio_data
*ctx
, int reg
)
71 return __raw_readl(ctx
->mmio
+ reg
);
74 static inline void WR(struct au1xpsc_audio_data
*ctx
, int reg
, unsigned long v
)
76 __raw_writel(v
, ctx
->mmio
+ reg
);
80 static int au1xi2s_set_fmt(struct snd_soc_dai
*cpu_dai
, unsigned int fmt
)
82 struct au1xpsc_audio_data
*ctx
= snd_soc_dai_get_drvdata(cpu_dai
);
90 switch (fmt
& SND_SOC_DAIFMT_FORMAT_MASK
) {
91 case SND_SOC_DAIFMT_I2S
:
94 case SND_SOC_DAIFMT_MSB
:
97 case SND_SOC_DAIFMT_LSB
:
104 c
&= ~(CFG_IC
| CFG_ICK
); /* IB-IF */
105 switch (fmt
& SND_SOC_DAIFMT_INV_MASK
) {
106 case SND_SOC_DAIFMT_NB_NF
:
107 c
|= CFG_IC
| CFG_ICK
;
109 case SND_SOC_DAIFMT_NB_IF
:
112 case SND_SOC_DAIFMT_IB_NF
:
115 case SND_SOC_DAIFMT_IB_IF
:
121 /* I2S controller only supports master */
122 switch (fmt
& SND_SOC_DAIFMT_MASTER_MASK
) {
123 case SND_SOC_DAIFMT_CBS_CFS
: /* CODEC slave */
135 static int au1xi2s_trigger(struct snd_pcm_substream
*substream
,
136 int cmd
, struct snd_soc_dai
*dai
)
138 struct au1xpsc_audio_data
*ctx
= snd_soc_dai_get_drvdata(dai
);
139 int stype
= SUBSTREAM_TYPE(substream
);
142 case SNDRV_PCM_TRIGGER_START
:
143 case SNDRV_PCM_TRIGGER_RESUME
:
145 WR(ctx
, I2S_ENABLE
, EN_D
| EN_CE
);
146 WR(ctx
, I2S_ENABLE
, EN_CE
);
147 ctx
->cfg
|= (stype
== PCM_TX
) ? CFG_TN
: CFG_RN
;
148 WR(ctx
, I2S_CFG
, ctx
->cfg
);
150 case SNDRV_PCM_TRIGGER_STOP
:
151 case SNDRV_PCM_TRIGGER_SUSPEND
:
152 ctx
->cfg
&= ~((stype
== PCM_TX
) ? CFG_TN
: CFG_RN
);
153 WR(ctx
, I2S_CFG
, ctx
->cfg
);
154 WR(ctx
, I2S_ENABLE
, EN_D
); /* power off */
163 static unsigned long msbits_to_reg(int msbits
)
180 static int au1xi2s_hw_params(struct snd_pcm_substream
*substream
,
181 struct snd_pcm_hw_params
*params
,
182 struct snd_soc_dai
*dai
)
184 struct au1xpsc_audio_data
*ctx
= snd_soc_dai_get_drvdata(dai
);
187 v
= msbits_to_reg(params
->msbits
);
191 ctx
->cfg
&= ~CFG_SZ_MASK
;
196 static int au1xi2s_startup(struct snd_pcm_substream
*substream
,
197 struct snd_soc_dai
*dai
)
199 struct au1xpsc_audio_data
*ctx
= snd_soc_dai_get_drvdata(dai
);
200 snd_soc_dai_set_dma_data(dai
, substream
, &ctx
->dmaids
[0]);
204 static const struct snd_soc_dai_ops au1xi2s_dai_ops
= {
205 .startup
= au1xi2s_startup
,
206 .trigger
= au1xi2s_trigger
,
207 .hw_params
= au1xi2s_hw_params
,
208 .set_fmt
= au1xi2s_set_fmt
,
211 static struct snd_soc_dai_driver au1xi2s_dai_driver
= {
212 .symmetric_rates
= 1,
214 .rates
= AU1XI2SC_RATES
,
215 .formats
= AU1XI2SC_FMTS
,
220 .rates
= AU1XI2SC_RATES
,
221 .formats
= AU1XI2SC_FMTS
,
225 .ops
= &au1xi2s_dai_ops
,
228 static const struct snd_soc_component_driver au1xi2s_component
= {
232 static int au1xi2s_drvprobe(struct platform_device
*pdev
)
234 struct resource
*iores
, *dmares
;
235 struct au1xpsc_audio_data
*ctx
;
237 ctx
= devm_kzalloc(&pdev
->dev
, sizeof(*ctx
), GFP_KERNEL
);
241 iores
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
245 if (!devm_request_mem_region(&pdev
->dev
, iores
->start
,
246 resource_size(iores
),
250 ctx
->mmio
= devm_ioremap_nocache(&pdev
->dev
, iores
->start
,
251 resource_size(iores
));
255 dmares
= platform_get_resource(pdev
, IORESOURCE_DMA
, 0);
258 ctx
->dmaids
[SNDRV_PCM_STREAM_PLAYBACK
] = dmares
->start
;
260 dmares
= platform_get_resource(pdev
, IORESOURCE_DMA
, 1);
263 ctx
->dmaids
[SNDRV_PCM_STREAM_CAPTURE
] = dmares
->start
;
265 platform_set_drvdata(pdev
, ctx
);
267 return snd_soc_register_component(&pdev
->dev
, &au1xi2s_component
,
268 &au1xi2s_dai_driver
, 1);
271 static int au1xi2s_drvremove(struct platform_device
*pdev
)
273 struct au1xpsc_audio_data
*ctx
= platform_get_drvdata(pdev
);
275 snd_soc_unregister_component(&pdev
->dev
);
277 WR(ctx
, I2S_ENABLE
, EN_D
); /* clock off, disable */
283 static int au1xi2s_drvsuspend(struct device
*dev
)
285 struct au1xpsc_audio_data
*ctx
= dev_get_drvdata(dev
);
287 WR(ctx
, I2S_ENABLE
, EN_D
); /* clock off, disable */
292 static int au1xi2s_drvresume(struct device
*dev
)
297 static const struct dev_pm_ops au1xi2sc_pmops
= {
298 .suspend
= au1xi2s_drvsuspend
,
299 .resume
= au1xi2s_drvresume
,
302 #define AU1XI2SC_PMOPS (&au1xi2sc_pmops)
306 #define AU1XI2SC_PMOPS NULL
310 static struct platform_driver au1xi2s_driver
= {
312 .name
= "alchemy-i2sc",
313 .owner
= THIS_MODULE
,
314 .pm
= AU1XI2SC_PMOPS
,
316 .probe
= au1xi2s_drvprobe
,
317 .remove
= au1xi2s_drvremove
,
320 module_platform_driver(au1xi2s_driver
);
322 MODULE_LICENSE("GPL");
323 MODULE_DESCRIPTION("Au1000/1500/1100 I2S ASoC driver");
324 MODULE_AUTHOR("Manuel Lauss");