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 | |
36 | static 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(p: 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 | */ |
86 | static 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(dai: 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 | */ |
106 | static 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(dai: 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 | */ |
124 | static 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 | |
130 | static 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 | |
149 | static 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 | */ |
159 | static 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(dev: &op->dev, component_driver: &psc_i2s_component, |
170 | dai_drv: 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(dev: &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_get_property(node: op->dev.of_node, name: "codec-handle" , NULL)) |
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 | |
212 | static void psc_i2s_of_remove(struct platform_device *op) |
213 | { |
214 | mpc5200_audio_dma_destroy(op); |
215 | snd_soc_unregister_component(dev: &op->dev); |
216 | } |
217 | |
218 | /* Match table for of_platform binding */ |
219 | static const struct of_device_id psc_i2s_match[] = { |
220 | { .compatible = "fsl,mpc5200-psc-i2s" , }, |
221 | { .compatible = "fsl,mpc5200b-psc-i2s" , }, |
222 | {} |
223 | }; |
224 | MODULE_DEVICE_TABLE(of, psc_i2s_match); |
225 | |
226 | static struct platform_driver psc_i2s_driver = { |
227 | .probe = psc_i2s_of_probe, |
228 | .remove_new = psc_i2s_of_remove, |
229 | .driver = { |
230 | .name = "mpc5200-psc-i2s" , |
231 | .of_match_table = psc_i2s_match, |
232 | }, |
233 | }; |
234 | |
235 | module_platform_driver(psc_i2s_driver); |
236 | |
237 | MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>" ); |
238 | MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver" ); |
239 | MODULE_LICENSE("GPL" ); |
240 | |
241 | |