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Grant Likelydc641372008-07-29 11:42:30 +01001/*
2 * Freescale MPC5200 PSC in I2S mode
3 * ALSA SoC Digital Audio Interface (DAI) driver
4 *
5 * Copyright (C) 2008 Secret Lab Technologies Ltd.
Jon Smirldbcc3472009-05-26 08:34:08 -04006 * Copyright (C) 2009 Jon Smirl, Digispeaker
Grant Likelydc641372008-07-29 11:42:30 +01007 */
8
Grant Likelydc641372008-07-29 11:42:30 +01009#include <linux/module.h>
Grant Likelydc641372008-07-29 11:42:30 +010010#include <linux/of_device.h>
11#include <linux/of_platform.h>
Grant Likelydc641372008-07-29 11:42:30 +010012
Grant Likelydc641372008-07-29 11:42:30 +010013#include <sound/pcm.h>
14#include <sound/pcm_params.h>
Grant Likelydc641372008-07-29 11:42:30 +010015#include <sound/soc.h>
Grant Likelydc641372008-07-29 11:42:30 +010016
Grant Likelydc641372008-07-29 11:42:30 +010017#include <asm/mpc52xx_psc.h>
18
Jon Smirl89dd0842009-05-23 19:12:59 -040019#include "mpc5200_dma.h"
20
Grant Likelydc641372008-07-29 11:42:30 +010021/**
22 * PSC_I2S_RATES: sample rates supported by the I2S
23 *
24 * This driver currently only supports the PSC running in I2S slave mode,
25 * which means the codec determines the sample rate. Therefore, we tell
26 * ALSA that we support all rates and let the codec driver decide what rates
27 * are really supported.
28 */
29#define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \
30 SNDRV_PCM_RATE_CONTINUOUS)
31
32/**
33 * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode
34 */
35#define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \
Jon Smirldbcc3472009-05-26 08:34:08 -040036 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)
Grant Likelydc641372008-07-29 11:42:30 +010037
Grant Likelydc641372008-07-29 11:42:30 +010038static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
Mark Browndee89c42008-11-18 22:11:38 +000039 struct snd_pcm_hw_params *params,
40 struct snd_soc_dai *dai)
Grant Likelydc641372008-07-29 11:42:30 +010041{
42 struct snd_soc_pcm_runtime *rtd = substream->private_data;
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +000043 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
Grant Likelydc641372008-07-29 11:42:30 +010044 u32 mode;
45
Jon Smirlcebe7762009-05-23 19:13:01 -040046 dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
Grant Likelydc641372008-07-29 11:42:30 +010047 " periods=%i buffer_size=%i buffer_bytes=%i\n",
48 __func__, substream, params_period_size(params),
49 params_period_bytes(params), params_periods(params),
50 params_buffer_size(params), params_buffer_bytes(params));
51
52 switch (params_format(params)) {
53 case SNDRV_PCM_FORMAT_S8:
54 mode = MPC52xx_PSC_SICR_SIM_CODEC_8;
55 break;
56 case SNDRV_PCM_FORMAT_S16_BE:
57 mode = MPC52xx_PSC_SICR_SIM_CODEC_16;
58 break;
59 case SNDRV_PCM_FORMAT_S24_BE:
60 mode = MPC52xx_PSC_SICR_SIM_CODEC_24;
61 break;
62 case SNDRV_PCM_FORMAT_S32_BE:
63 mode = MPC52xx_PSC_SICR_SIM_CODEC_32;
64 break;
65 default:
Jon Smirlcebe7762009-05-23 19:13:01 -040066 dev_dbg(psc_dma->dev, "invalid format\n");
Grant Likelydc641372008-07-29 11:42:30 +010067 return -EINVAL;
68 }
Jon Smirlcebe7762009-05-23 19:13:01 -040069 out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode);
Grant Likelydc641372008-07-29 11:42:30 +010070
Grant Likelydc641372008-07-29 11:42:30 +010071 return 0;
72}
73
Grant Likelydc641372008-07-29 11:42:30 +010074/**
75 * psc_i2s_set_sysclk: set the clock frequency and direction
76 *
77 * This function is called by the machine driver to tell us what the clock
78 * frequency and direction are.
79 *
80 * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN),
81 * and we don't care about the frequency. Return an error if the direction
82 * is not SND_SOC_CLOCK_IN.
83 *
84 * @clk_id: reserved, should be zero
85 * @freq: the frequency of the given clock ID, currently ignored
86 * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master)
87 */
88static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
89 int clk_id, unsigned int freq, int dir)
90{
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +000091 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
Jon Smirlcebe7762009-05-23 19:13:01 -040092 dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",
Grant Likelydc641372008-07-29 11:42:30 +010093 cpu_dai, dir);
94 return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL;
95}
96
97/**
98 * psc_i2s_set_fmt: set the serial format.
99 *
100 * This function is called by the machine driver to tell us what serial
101 * format to use.
102 *
103 * This driver only supports I2S mode. Return an error if the format is
104 * not SND_SOC_DAIFMT_I2S.
105 *
106 * @format: one of SND_SOC_DAIFMT_xxx
107 */
108static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format)
109{
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000110 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
Jon Smirlcebe7762009-05-23 19:13:01 -0400111 dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",
Grant Likelydc641372008-07-29 11:42:30 +0100112 cpu_dai, format);
113 return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL;
114}
115
116/* ---------------------------------------------------------------------
117 * ALSA SoC Bindings
118 *
119 * - Digital Audio Interface (DAI) template
120 * - create/destroy dai hooks
121 */
122
123/**
124 * psc_i2s_dai_template: template CPU Digital Audio Interface
125 */
Lars-Peter Clausen85e76522011-11-23 11:40:40 +0100126static const struct snd_soc_dai_ops psc_i2s_dai_ops = {
Eric Miao6335d052009-03-03 09:41:00 +0800127 .hw_params = psc_i2s_hw_params,
Eric Miao6335d052009-03-03 09:41:00 +0800128 .set_sysclk = psc_i2s_set_sysclk,
129 .set_fmt = psc_i2s_set_fmt,
130};
131
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000132static struct snd_soc_dai_driver psc_i2s_dai[] = {{
Grant Likelydc641372008-07-29 11:42:30 +0100133 .playback = {
134 .channels_min = 2,
135 .channels_max = 2,
136 .rates = PSC_I2S_RATES,
137 .formats = PSC_I2S_FORMATS,
138 },
139 .capture = {
140 .channels_min = 2,
141 .channels_max = 2,
142 .rates = PSC_I2S_RATES,
143 .formats = PSC_I2S_FORMATS,
144 },
Eric Miao6335d052009-03-03 09:41:00 +0800145 .ops = &psc_i2s_dai_ops,
Jon Smirldbcc3472009-05-26 08:34:08 -0400146} };
Grant Likelydc641372008-07-29 11:42:30 +0100147
148/* ---------------------------------------------------------------------
149 * OF platform bus binding code:
150 * - Probe/remove operations
151 * - OF device match table
152 */
Grant Likelyf07eb222011-02-22 21:05:04 -0700153static int __devinit psc_i2s_of_probe(struct platform_device *op)
Grant Likelydc641372008-07-29 11:42:30 +0100154{
Jon Smirldbcc3472009-05-26 08:34:08 -0400155 int rc;
Jon Smirlcebe7762009-05-23 19:13:01 -0400156 struct psc_dma *psc_dma;
Jon Smirldbcc3472009-05-26 08:34:08 -0400157 struct mpc52xx_psc __iomem *regs;
Grant Likelydc641372008-07-29 11:42:30 +0100158
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000159 rc = snd_soc_register_dais(&op->dev, psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai));
Jon Smirldbcc3472009-05-26 08:34:08 -0400160 if (rc != 0) {
161 pr_err("Failed to register DAI\n");
Axel Lin1ebd0062010-11-08 13:24:58 +0800162 return rc;
Grant Likelydc641372008-07-29 11:42:30 +0100163 }
164
Jon Smirldbcc3472009-05-26 08:34:08 -0400165 psc_dma = dev_get_drvdata(&op->dev);
166 regs = psc_dma->psc_regs;
Grant Likelydc641372008-07-29 11:42:30 +0100167
168 /* Configure the serial interface mode; defaulting to CODEC8 mode */
Jon Smirlcebe7762009-05-23 19:13:01 -0400169 psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |
Grant Likelydc641372008-07-29 11:42:30 +0100170 MPC52xx_PSC_SICR_CLKPOL;
Jon Smirlcebe7762009-05-23 19:13:01 -0400171 out_be32(&psc_dma->psc_regs->sicr,
172 psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8);
Grant Likelydc641372008-07-29 11:42:30 +0100173
174 /* Check for the codec handle. If it is not present then we
175 * are done */
Grant Likely61c7a082010-04-13 16:12:29 -0700176 if (!of_get_property(op->dev.of_node, "codec-handle", NULL))
Grant Likelydc641372008-07-29 11:42:30 +0100177 return 0;
178
Jon Smirldbcc3472009-05-26 08:34:08 -0400179 /* Due to errata in the dma mode; need to line up enabling
180 * the transmitter with a transition on the frame sync
181 * line */
Grant Likelydc641372008-07-29 11:42:30 +0100182
Jon Smirldbcc3472009-05-26 08:34:08 -0400183 /* first make sure it is low */
184 while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) != 0)
185 ;
186 /* then wait for the transition to high */
187 while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) == 0)
188 ;
189 /* Finally, enable the PSC.
190 * Receiver must always be enabled; even when we only want
191 * transmit. (see 15.3.2.3 of MPC5200B User's Guide) */
Grant Likelydc641372008-07-29 11:42:30 +0100192
Jon Smirldbcc3472009-05-26 08:34:08 -0400193 /* Go */
194 out_8(&psc_dma->psc_regs->command,
195 MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
Grant Likelydc641372008-07-29 11:42:30 +0100196
197 return 0;
Jon Smirldbcc3472009-05-26 08:34:08 -0400198
Grant Likelydc641372008-07-29 11:42:30 +0100199}
200
Grant Likely2dc11582010-08-06 09:25:50 -0600201static int __devexit psc_i2s_of_remove(struct platform_device *op)
Grant Likelydc641372008-07-29 11:42:30 +0100202{
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000203 snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_i2s_dai));
204 return 0;
Grant Likelydc641372008-07-29 11:42:30 +0100205}
206
207/* Match table for of_platform binding */
208static struct of_device_id psc_i2s_match[] __devinitdata = {
209 { .compatible = "fsl,mpc5200-psc-i2s", },
Jon Smirldbcc3472009-05-26 08:34:08 -0400210 { .compatible = "fsl,mpc5200b-psc-i2s", },
Grant Likelydc641372008-07-29 11:42:30 +0100211 {}
212};
213MODULE_DEVICE_TABLE(of, psc_i2s_match);
214
Grant Likelyf07eb222011-02-22 21:05:04 -0700215static struct platform_driver psc_i2s_driver = {
Grant Likelydc641372008-07-29 11:42:30 +0100216 .probe = psc_i2s_of_probe,
217 .remove = __devexit_p(psc_i2s_of_remove),
218 .driver = {
219 .name = "mpc5200-psc-i2s",
220 .owner = THIS_MODULE,
Grant Likely40182942010-04-13 16:13:02 -0700221 .of_match_table = psc_i2s_match,
Grant Likelydc641372008-07-29 11:42:30 +0100222 },
223};
224
Axel Linba0a7e02011-11-25 10:10:55 +0800225module_platform_driver(psc_i2s_driver);
Grant Likelydc641372008-07-29 11:42:30 +0100226
Jon Smirldbcc3472009-05-26 08:34:08 -0400227MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
228MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
229MODULE_LICENSE("GPL");
Grant Likelydc641372008-07-29 11:42:30 +0100230