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1// SPDX-License-Identifier: GPL-2.0-only
2//
3// Freescale MPC5200 PSC in I2S mode
4// ALSA SoC Digital Audio Interface (DAI) driver
5//
6// Copyright (C) 2008 Secret Lab Technologies Ltd.
7// Copyright (C) 2009 Jon Smirl, Digispeaker
8
9#include <linux/module.h>
10#include <linux/of.h>
11
12#include <sound/pcm.h>
13#include <sound/pcm_params.h>
14#include <sound/soc.h>
15
16#include <asm/mpc52xx_psc.h>
17
18#include "mpc5200_dma.h"
19
20/**
21 * PSC_I2S_RATES: sample rates supported by the I2S
22 *
23 * This driver currently only supports the PSC running in I2S slave mode,
24 * which means the codec determines the sample rate. Therefore, we tell
25 * ALSA that we support all rates and let the codec driver decide what rates
26 * are really supported.
27 */
28#define PSC_I2S_RATES SNDRV_PCM_RATE_CONTINUOUS
29
30/**
31 * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode
32 */
33#define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \
34 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)
35
36static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
37 struct snd_pcm_hw_params *params,
38 struct snd_soc_dai *dai)
39{
40 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
41 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
42 u32 mode;
43
44 dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
45 " periods=%i buffer_size=%i buffer_bytes=%i\n",
46 __func__, substream, params_period_size(params),
47 params_period_bytes(params), params_periods(params),
48 params_buffer_size(params), params_buffer_bytes(params));
49
50 switch (params_format(params)) {
51 case SNDRV_PCM_FORMAT_S8:
52 mode = MPC52xx_PSC_SICR_SIM_CODEC_8;
53 break;
54 case SNDRV_PCM_FORMAT_S16_BE:
55 mode = MPC52xx_PSC_SICR_SIM_CODEC_16;
56 break;
57 case SNDRV_PCM_FORMAT_S24_BE:
58 mode = MPC52xx_PSC_SICR_SIM_CODEC_24;
59 break;
60 case SNDRV_PCM_FORMAT_S32_BE:
61 mode = MPC52xx_PSC_SICR_SIM_CODEC_32;
62 break;
63 default:
64 dev_dbg(psc_dma->dev, "invalid format\n");
65 return -EINVAL;
66 }
67 out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode);
68
69 return 0;
70}
71
72/**
73 * psc_i2s_set_sysclk: set the clock frequency and direction
74 *
75 * This function is called by the machine driver to tell us what the clock
76 * frequency and direction are.
77 *
78 * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN),
79 * and we don't care about the frequency. Return an error if the direction
80 * is not SND_SOC_CLOCK_IN.
81 *
82 * @clk_id: reserved, should be zero
83 * @freq: the frequency of the given clock ID, currently ignored
84 * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master)
85 */
86static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
87 int clk_id, unsigned int freq, int dir)
88{
89 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
90 dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",
91 cpu_dai, dir);
92 return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL;
93}
94
95/**
96 * psc_i2s_set_fmt: set the serial format.
97 *
98 * This function is called by the machine driver to tell us what serial
99 * format to use.
100 *
101 * This driver only supports I2S mode. Return an error if the format is
102 * not SND_SOC_DAIFMT_I2S.
103 *
104 * @format: one of SND_SOC_DAIFMT_xxx
105 */
106static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format)
107{
108 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
109 dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",
110 cpu_dai, format);
111 return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL;
112}
113
114/* ---------------------------------------------------------------------
115 * ALSA SoC Bindings
116 *
117 * - Digital Audio Interface (DAI) template
118 * - create/destroy dai hooks
119 */
120
121/**
122 * psc_i2s_dai_template: template CPU Digital Audio Interface
123 */
124static const struct snd_soc_dai_ops psc_i2s_dai_ops = {
125 .hw_params = psc_i2s_hw_params,
126 .set_sysclk = psc_i2s_set_sysclk,
127 .set_fmt = psc_i2s_set_fmt,
128};
129
130static struct snd_soc_dai_driver psc_i2s_dai[] = {{
131 .name = "mpc5200-psc-i2s.0",
132 .playback = {
133 .stream_name = "I2S Playback",
134 .channels_min = 2,
135 .channels_max = 2,
136 .rates = PSC_I2S_RATES,
137 .formats = PSC_I2S_FORMATS,
138 },
139 .capture = {
140 .stream_name = "I2S Capture",
141 .channels_min = 2,
142 .channels_max = 2,
143 .rates = PSC_I2S_RATES,
144 .formats = PSC_I2S_FORMATS,
145 },
146 .ops = &psc_i2s_dai_ops,
147} };
148
149static const struct snd_soc_component_driver psc_i2s_component = {
150 .name = "mpc5200-i2s",
151 .legacy_dai_naming = 1,
152};
153
154/* ---------------------------------------------------------------------
155 * OF platform bus binding code:
156 * - Probe/remove operations
157 * - OF device match table
158 */
159static int psc_i2s_of_probe(struct platform_device *op)
160{
161 int rc;
162 struct psc_dma *psc_dma;
163 struct mpc52xx_psc __iomem *regs;
164
165 rc = mpc5200_audio_dma_create(op);
166 if (rc != 0)
167 return rc;
168
169 rc = snd_soc_register_component(&op->dev, &psc_i2s_component,
170 psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai));
171 if (rc != 0) {
172 pr_err("Failed to register DAI\n");
173 return rc;
174 }
175
176 psc_dma = dev_get_drvdata(&op->dev);
177 regs = psc_dma->psc_regs;
178
179 /* Configure the serial interface mode; defaulting to CODEC8 mode */
180 psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |
181 MPC52xx_PSC_SICR_CLKPOL;
182 out_be32(&psc_dma->psc_regs->sicr,
183 psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8);
184
185 /* Check for the codec handle. If it is not present then we
186 * are done */
187 if (!of_property_present(op->dev.of_node, "codec-handle"))
188 return 0;
189
190 /* Due to errata in the dma mode; need to line up enabling
191 * the transmitter with a transition on the frame sync
192 * line */
193
194 /* first make sure it is low */
195 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0)
196 ;
197 /* then wait for the transition to high */
198 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) == 0)
199 ;
200 /* Finally, enable the PSC.
201 * Receiver must always be enabled; even when we only want
202 * transmit. (see 15.3.2.3 of MPC5200B User's Guide) */
203
204 /* Go */
205 out_8(&psc_dma->psc_regs->command,
206 MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
207
208 return 0;
209
210}
211
212static void psc_i2s_of_remove(struct platform_device *op)
213{
214 mpc5200_audio_dma_destroy(op);
215 snd_soc_unregister_component(&op->dev);
216}
217
218/* Match table for of_platform binding */
219static const struct of_device_id psc_i2s_match[] = {
220 { .compatible = "fsl,mpc5200-psc-i2s", },
221 { .compatible = "fsl,mpc5200b-psc-i2s", },
222 {}
223};
224MODULE_DEVICE_TABLE(of, psc_i2s_match);
225
226static struct platform_driver psc_i2s_driver = {
227 .probe = psc_i2s_of_probe,
228 .remove = psc_i2s_of_remove,
229 .driver = {
230 .name = "mpc5200-psc-i2s",
231 .of_match_table = psc_i2s_match,
232 },
233};
234
235module_platform_driver(psc_i2s_driver);
236
237MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
238MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
239MODULE_LICENSE("GPL");
240
1/*
2 * Freescale MPC5200 PSC in I2S mode
3 * ALSA SoC Digital Audio Interface (DAI) driver
4 *
5 * Copyright (C) 2008 Secret Lab Technologies Ltd.
6 * Copyright (C) 2009 Jon Smirl, Digispeaker
7 */
8
9#include <linux/module.h>
10#include <linux/of_device.h>
11#include <linux/of_platform.h>
12
13#include <sound/pcm.h>
14#include <sound/pcm_params.h>
15#include <sound/soc.h>
16
17#include <asm/mpc52xx_psc.h>
18
19#include "mpc5200_dma.h"
20
21/**
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 | \
36 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)
37
38static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
39 struct snd_pcm_hw_params *params,
40 struct snd_soc_dai *dai)
41{
42 struct snd_soc_pcm_runtime *rtd = substream->private_data;
43 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
44 u32 mode;
45
46 dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
47 " 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:
66 dev_dbg(psc_dma->dev, "invalid format\n");
67 return -EINVAL;
68 }
69 out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode);
70
71 return 0;
72}
73
74/**
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{
91 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
92 dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",
93 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{
110 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
111 dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",
112 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 */
126static struct snd_soc_dai_ops psc_i2s_dai_ops = {
127 .hw_params = psc_i2s_hw_params,
128 .set_sysclk = psc_i2s_set_sysclk,
129 .set_fmt = psc_i2s_set_fmt,
130};
131
132static struct snd_soc_dai_driver psc_i2s_dai[] = {{
133 .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 },
145 .ops = &psc_i2s_dai_ops,
146} };
147
148/* ---------------------------------------------------------------------
149 * OF platform bus binding code:
150 * - Probe/remove operations
151 * - OF device match table
152 */
153static int __devinit psc_i2s_of_probe(struct platform_device *op)
154{
155 int rc;
156 struct psc_dma *psc_dma;
157 struct mpc52xx_psc __iomem *regs;
158
159 rc = snd_soc_register_dais(&op->dev, psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai));
160 if (rc != 0) {
161 pr_err("Failed to register DAI\n");
162 return rc;
163 }
164
165 psc_dma = dev_get_drvdata(&op->dev);
166 regs = psc_dma->psc_regs;
167
168 /* Configure the serial interface mode; defaulting to CODEC8 mode */
169 psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |
170 MPC52xx_PSC_SICR_CLKPOL;
171 out_be32(&psc_dma->psc_regs->sicr,
172 psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8);
173
174 /* Check for the codec handle. If it is not present then we
175 * are done */
176 if (!of_get_property(op->dev.of_node, "codec-handle", NULL))
177 return 0;
178
179 /* Due to errata in the dma mode; need to line up enabling
180 * the transmitter with a transition on the frame sync
181 * line */
182
183 /* first make sure it is low */
184 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0)
185 ;
186 /* then wait for the transition to high */
187 while ((in_8(®s->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) */
192
193 /* Go */
194 out_8(&psc_dma->psc_regs->command,
195 MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
196
197 return 0;
198
199}
200
201static int __devexit psc_i2s_of_remove(struct platform_device *op)
202{
203 snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_i2s_dai));
204 return 0;
205}
206
207/* Match table for of_platform binding */
208static struct of_device_id psc_i2s_match[] __devinitdata = {
209 { .compatible = "fsl,mpc5200-psc-i2s", },
210 { .compatible = "fsl,mpc5200b-psc-i2s", },
211 {}
212};
213MODULE_DEVICE_TABLE(of, psc_i2s_match);
214
215static struct platform_driver psc_i2s_driver = {
216 .probe = psc_i2s_of_probe,
217 .remove = __devexit_p(psc_i2s_of_remove),
218 .driver = {
219 .name = "mpc5200-psc-i2s",
220 .owner = THIS_MODULE,
221 .of_match_table = psc_i2s_match,
222 },
223};
224
225/* ---------------------------------------------------------------------
226 * Module setup and teardown; simply register the of_platform driver
227 * for the PSC in I2S mode.
228 */
229static int __init psc_i2s_init(void)
230{
231 return platform_driver_register(&psc_i2s_driver);
232}
233module_init(psc_i2s_init);
234
235static void __exit psc_i2s_exit(void)
236{
237 platform_driver_unregister(&psc_i2s_driver);
238}
239module_exit(psc_i2s_exit);
240
241MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
242MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
243MODULE_LICENSE("GPL");
244