1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Pistachio internal dac driver
4 *
5 * Copyright (C) 2015 Imagination Technologies Ltd.
6 *
7 * Author: Damien Horsley <Damien.Horsley@imgtec.com>
8 */
9
10 #include <linux/clk.h>
11 #include <linux/delay.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/module.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/regmap.h>
16 #include <linux/regulator/consumer.h>
17
18 #include <sound/pcm_params.h>
19 #include <sound/soc.h>
20
21 #define PISTACHIO_INTERNAL_DAC_CTRL 0x40
22 #define PISTACHIO_INTERNAL_DAC_CTRL_PWR_SEL_MASK 0x2
23 #define PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK 0x1
24
25 #define PISTACHIO_INTERNAL_DAC_SRST 0x44
26 #define PISTACHIO_INTERNAL_DAC_SRST_MASK 0x1
27
28 #define PISTACHIO_INTERNAL_DAC_GTI_CTRL 0x48
29 #define PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_SHIFT 0
30 #define PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_MASK 0xFFF
31 #define PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK 0x1000
32 #define PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_SHIFT 13
33 #define PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_MASK 0x1FE000
34
35 #define PISTACHIO_INTERNAL_DAC_PWR 0x1
36 #define PISTACHIO_INTERNAL_DAC_PWR_MASK 0x1
37
38 #define PISTACHIO_INTERNAL_DAC_FORMATS (SNDRV_PCM_FMTBIT_S24_LE | \
39 SNDRV_PCM_FMTBIT_S32_LE)
40
41 /* codec private data */
42 struct pistachio_internal_dac {
43 struct regmap *regmap;
44 struct regulator *supply;
45 bool mute;
46 };
47
48 static const struct snd_kcontrol_new pistachio_internal_dac_snd_controls[] = {
49 SOC_SINGLE("Playback Switch", PISTACHIO_INTERNAL_DAC_CTRL, 2, 1, 1)
50 };
51
52 static const struct snd_soc_dapm_widget pistachio_internal_dac_widgets[] = {
53 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
54 SND_SOC_DAPM_OUTPUT("AOUTL"),
55 SND_SOC_DAPM_OUTPUT("AOUTR"),
56 };
57
58 static const struct snd_soc_dapm_route pistachio_internal_dac_routes[] = {
59 { "AOUTL", NULL, "DAC" },
60 { "AOUTR", NULL, "DAC" },
61 };
62
pistachio_internal_dac_reg_writel(struct regmap * top_regs,u32 val,u32 reg)63 static void pistachio_internal_dac_reg_writel(struct regmap *top_regs,
64 u32 val, u32 reg)
65 {
66 regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL,
67 PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_MASK,
68 reg << PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_SHIFT);
69
70 regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL,
71 PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_MASK,
72 val << PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_SHIFT);
73
74 regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL,
75 PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK,
76 PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK);
77
78 regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL,
79 PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK, 0);
80 }
81
pistachio_internal_dac_pwr_off(struct pistachio_internal_dac * dac)82 static void pistachio_internal_dac_pwr_off(struct pistachio_internal_dac *dac)
83 {
84 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL,
85 PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK,
86 PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK);
87
88 pistachio_internal_dac_reg_writel(dac->regmap, 0,
89 PISTACHIO_INTERNAL_DAC_PWR);
90 }
91
pistachio_internal_dac_pwr_on(struct pistachio_internal_dac * dac)92 static void pistachio_internal_dac_pwr_on(struct pistachio_internal_dac *dac)
93 {
94 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_SRST,
95 PISTACHIO_INTERNAL_DAC_SRST_MASK,
96 PISTACHIO_INTERNAL_DAC_SRST_MASK);
97
98 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_SRST,
99 PISTACHIO_INTERNAL_DAC_SRST_MASK, 0);
100
101 pistachio_internal_dac_reg_writel(dac->regmap,
102 PISTACHIO_INTERNAL_DAC_PWR_MASK,
103 PISTACHIO_INTERNAL_DAC_PWR);
104
105 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL,
106 PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK, 0);
107 }
108
109 static struct snd_soc_dai_driver pistachio_internal_dac_dais[] = {
110 {
111 .name = "pistachio_internal_dac",
112 .playback = {
113 .stream_name = "Playback",
114 .channels_min = 2,
115 .channels_max = 2,
116 .rates = SNDRV_PCM_RATE_8000_48000,
117 .formats = PISTACHIO_INTERNAL_DAC_FORMATS,
118 }
119 },
120 };
121
pistachio_internal_dac_codec_probe(struct snd_soc_component * component)122 static int pistachio_internal_dac_codec_probe(struct snd_soc_component *component)
123 {
124 struct pistachio_internal_dac *dac = snd_soc_component_get_drvdata(component);
125
126 snd_soc_component_init_regmap(component, dac->regmap);
127
128 return 0;
129 }
130
131 static const struct snd_soc_component_driver pistachio_internal_dac_driver = {
132 .probe = pistachio_internal_dac_codec_probe,
133 .controls = pistachio_internal_dac_snd_controls,
134 .num_controls = ARRAY_SIZE(pistachio_internal_dac_snd_controls),
135 .dapm_widgets = pistachio_internal_dac_widgets,
136 .num_dapm_widgets = ARRAY_SIZE(pistachio_internal_dac_widgets),
137 .dapm_routes = pistachio_internal_dac_routes,
138 .num_dapm_routes = ARRAY_SIZE(pistachio_internal_dac_routes),
139 .use_pmdown_time = 1,
140 .endianness = 1,
141 };
142
pistachio_internal_dac_probe(struct platform_device * pdev)143 static int pistachio_internal_dac_probe(struct platform_device *pdev)
144 {
145 struct pistachio_internal_dac *dac;
146 int ret, voltage;
147 struct device *dev = &pdev->dev;
148 u32 reg;
149
150 dac = devm_kzalloc(dev, sizeof(*dac), GFP_KERNEL);
151
152 if (!dac)
153 return -ENOMEM;
154
155 platform_set_drvdata(pdev, dac);
156
157 dac->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
158 "img,cr-top");
159 if (IS_ERR(dac->regmap))
160 return PTR_ERR(dac->regmap);
161
162 dac->supply = devm_regulator_get(dev, "VDD");
163 if (IS_ERR(dac->supply))
164 return dev_err_probe(dev, PTR_ERR(dac->supply),
165 "failed to acquire supply 'VDD-supply'\n");
166
167 ret = regulator_enable(dac->supply);
168 if (ret) {
169 dev_err(dev, "failed to enable supply: %d\n", ret);
170 return ret;
171 }
172
173 voltage = regulator_get_voltage(dac->supply);
174
175 switch (voltage) {
176 case 1800000:
177 reg = 0;
178 break;
179 case 3300000:
180 reg = PISTACHIO_INTERNAL_DAC_CTRL_PWR_SEL_MASK;
181 break;
182 default:
183 dev_err(dev, "invalid voltage: %d\n", voltage);
184 ret = -EINVAL;
185 goto err_regulator;
186 }
187
188 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL,
189 PISTACHIO_INTERNAL_DAC_CTRL_PWR_SEL_MASK, reg);
190
191 pistachio_internal_dac_pwr_off(dac);
192 pistachio_internal_dac_pwr_on(dac);
193
194 pm_runtime_set_active(dev);
195 pm_runtime_enable(dev);
196 pm_runtime_idle(dev);
197
198 ret = devm_snd_soc_register_component(dev,
199 &pistachio_internal_dac_driver,
200 pistachio_internal_dac_dais,
201 ARRAY_SIZE(pistachio_internal_dac_dais));
202 if (ret) {
203 dev_err(dev, "failed to register component: %d\n", ret);
204 goto err_pwr;
205 }
206
207 return 0;
208
209 err_pwr:
210 pm_runtime_disable(&pdev->dev);
211 pistachio_internal_dac_pwr_off(dac);
212 err_regulator:
213 regulator_disable(dac->supply);
214
215 return ret;
216 }
217
pistachio_internal_dac_remove(struct platform_device * pdev)218 static void pistachio_internal_dac_remove(struct platform_device *pdev)
219 {
220 struct pistachio_internal_dac *dac = dev_get_drvdata(&pdev->dev);
221
222 pm_runtime_disable(&pdev->dev);
223 pistachio_internal_dac_pwr_off(dac);
224 regulator_disable(dac->supply);
225 }
226
227 #ifdef CONFIG_PM
pistachio_internal_dac_rt_resume(struct device * dev)228 static int pistachio_internal_dac_rt_resume(struct device *dev)
229 {
230 struct pistachio_internal_dac *dac = dev_get_drvdata(dev);
231 int ret;
232
233 ret = regulator_enable(dac->supply);
234 if (ret) {
235 dev_err(dev, "failed to enable supply: %d\n", ret);
236 return ret;
237 }
238
239 pistachio_internal_dac_pwr_on(dac);
240
241 return 0;
242 }
243
pistachio_internal_dac_rt_suspend(struct device * dev)244 static int pistachio_internal_dac_rt_suspend(struct device *dev)
245 {
246 struct pistachio_internal_dac *dac = dev_get_drvdata(dev);
247
248 pistachio_internal_dac_pwr_off(dac);
249
250 regulator_disable(dac->supply);
251
252 return 0;
253 }
254 #endif
255
256 static const struct dev_pm_ops pistachio_internal_dac_pm_ops = {
257 SET_RUNTIME_PM_OPS(pistachio_internal_dac_rt_suspend,
258 pistachio_internal_dac_rt_resume, NULL)
259 };
260
261 static const struct of_device_id pistachio_internal_dac_of_match[] = {
262 { .compatible = "img,pistachio-internal-dac" },
263 {}
264 };
265 MODULE_DEVICE_TABLE(of, pistachio_internal_dac_of_match);
266
267 static struct platform_driver pistachio_internal_dac_plat_driver = {
268 .driver = {
269 .name = "img-pistachio-internal-dac",
270 .of_match_table = pistachio_internal_dac_of_match,
271 .pm = &pistachio_internal_dac_pm_ops
272 },
273 .probe = pistachio_internal_dac_probe,
274 .remove_new = pistachio_internal_dac_remove
275 };
276 module_platform_driver(pistachio_internal_dac_plat_driver);
277
278 MODULE_DESCRIPTION("Pistachio Internal DAC driver");
279 MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
280 MODULE_LICENSE("GPL v2");
281