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13#include <linux/clk.h>
14#include <linux/delay.h>
15#include <linux/mfd/syscon.h>
16#include <linux/module.h>
17#include <linux/pm_runtime.h>
18#include <linux/regmap.h>
19#include <linux/regulator/consumer.h>
20
21#include <sound/pcm_params.h>
22#include <sound/soc.h>
23
24#define PISTACHIO_INTERNAL_DAC_CTRL 0x40
25#define PISTACHIO_INTERNAL_DAC_CTRL_PWR_SEL_MASK 0x2
26#define PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK 0x1
27
28#define PISTACHIO_INTERNAL_DAC_SRST 0x44
29#define PISTACHIO_INTERNAL_DAC_SRST_MASK 0x1
30
31#define PISTACHIO_INTERNAL_DAC_GTI_CTRL 0x48
32#define PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_SHIFT 0
33#define PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_MASK 0xFFF
34#define PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK 0x1000
35#define PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_SHIFT 13
36#define PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_MASK 0x1FE000
37
38#define PISTACHIO_INTERNAL_DAC_PWR 0x1
39#define PISTACHIO_INTERNAL_DAC_PWR_MASK 0x1
40
41#define PISTACHIO_INTERNAL_DAC_FORMATS (SNDRV_PCM_FMTBIT_S24_LE | \
42 SNDRV_PCM_FMTBIT_S32_LE)
43
44
45struct pistachio_internal_dac {
46 struct regmap *regmap;
47 struct regulator *supply;
48 bool mute;
49};
50
51static const struct snd_kcontrol_new pistachio_internal_dac_snd_controls[] = {
52 SOC_SINGLE("Playback Switch", PISTACHIO_INTERNAL_DAC_CTRL, 2, 1, 1)
53};
54
55static const struct snd_soc_dapm_widget pistachio_internal_dac_widgets[] = {
56 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
57 SND_SOC_DAPM_OUTPUT("AOUTL"),
58 SND_SOC_DAPM_OUTPUT("AOUTR"),
59};
60
61static const struct snd_soc_dapm_route pistachio_internal_dac_routes[] = {
62 { "AOUTL", NULL, "DAC" },
63 { "AOUTR", NULL, "DAC" },
64};
65
66static void pistachio_internal_dac_reg_writel(struct regmap *top_regs,
67 u32 val, u32 reg)
68{
69 regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL,
70 PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_MASK,
71 reg << PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_SHIFT);
72
73 regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL,
74 PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_MASK,
75 val << PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_SHIFT);
76
77 regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL,
78 PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK,
79 PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK);
80
81 regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL,
82 PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK, 0);
83}
84
85static void pistachio_internal_dac_pwr_off(struct pistachio_internal_dac *dac)
86{
87 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL,
88 PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK,
89 PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK);
90
91 pistachio_internal_dac_reg_writel(dac->regmap, 0,
92 PISTACHIO_INTERNAL_DAC_PWR);
93}
94
95static void pistachio_internal_dac_pwr_on(struct pistachio_internal_dac *dac)
96{
97 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_SRST,
98 PISTACHIO_INTERNAL_DAC_SRST_MASK,
99 PISTACHIO_INTERNAL_DAC_SRST_MASK);
100
101 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_SRST,
102 PISTACHIO_INTERNAL_DAC_SRST_MASK, 0);
103
104 pistachio_internal_dac_reg_writel(dac->regmap,
105 PISTACHIO_INTERNAL_DAC_PWR_MASK,
106 PISTACHIO_INTERNAL_DAC_PWR);
107
108 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL,
109 PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK, 0);
110}
111
112static struct snd_soc_dai_driver pistachio_internal_dac_dais[] = {
113 {
114 .name = "pistachio_internal_dac",
115 .playback = {
116 .stream_name = "Playback",
117 .channels_min = 2,
118 .channels_max = 2,
119 .rates = SNDRV_PCM_RATE_8000_48000,
120 .formats = PISTACHIO_INTERNAL_DAC_FORMATS,
121 }
122 },
123};
124
125static int pistachio_internal_dac_codec_probe(struct snd_soc_codec *codec)
126{
127 struct pistachio_internal_dac *dac = snd_soc_codec_get_drvdata(codec);
128
129 snd_soc_codec_init_regmap(codec, dac->regmap);
130
131 return 0;
132}
133
134static const struct snd_soc_codec_driver pistachio_internal_dac_driver = {
135 .probe = pistachio_internal_dac_codec_probe,
136 .idle_bias_off = true,
137 .component_driver = {
138 .controls = pistachio_internal_dac_snd_controls,
139 .num_controls = ARRAY_SIZE(pistachio_internal_dac_snd_controls),
140 .dapm_widgets = pistachio_internal_dac_widgets,
141 .num_dapm_widgets = ARRAY_SIZE(pistachio_internal_dac_widgets),
142 .dapm_routes = pistachio_internal_dac_routes,
143 .num_dapm_routes = ARRAY_SIZE(pistachio_internal_dac_routes),
144 },
145};
146
147static int pistachio_internal_dac_probe(struct platform_device *pdev)
148{
149 struct pistachio_internal_dac *dac;
150 int ret, voltage;
151 struct device *dev = &pdev->dev;
152 u32 reg;
153
154 dac = devm_kzalloc(dev, sizeof(*dac), GFP_KERNEL);
155
156 if (!dac)
157 return -ENOMEM;
158
159 platform_set_drvdata(pdev, dac);
160
161 dac->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
162 "img,cr-top");
163 if (IS_ERR(dac->regmap))
164 return PTR_ERR(dac->regmap);
165
166 dac->supply = devm_regulator_get(dev, "VDD");
167 if (IS_ERR(dac->supply)) {
168 ret = PTR_ERR(dac->supply);
169 if (ret != -EPROBE_DEFER)
170 dev_err(dev, "failed to acquire supply 'VDD-supply': %d\n", ret);
171 return ret;
172 }
173
174 ret = regulator_enable(dac->supply);
175 if (ret) {
176 dev_err(dev, "failed to enable supply: %d\n", ret);
177 return ret;
178 }
179
180 voltage = regulator_get_voltage(dac->supply);
181
182 switch (voltage) {
183 case 1800000:
184 reg = 0;
185 break;
186 case 3300000:
187 reg = PISTACHIO_INTERNAL_DAC_CTRL_PWR_SEL_MASK;
188 break;
189 default:
190 dev_err(dev, "invalid voltage: %d\n", voltage);
191 ret = -EINVAL;
192 goto err_regulator;
193 }
194
195 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL,
196 PISTACHIO_INTERNAL_DAC_CTRL_PWR_SEL_MASK, reg);
197
198 pistachio_internal_dac_pwr_off(dac);
199 pistachio_internal_dac_pwr_on(dac);
200
201 pm_runtime_set_active(dev);
202 pm_runtime_enable(dev);
203 pm_runtime_idle(dev);
204
205 ret = snd_soc_register_codec(dev, &pistachio_internal_dac_driver,
206 pistachio_internal_dac_dais,
207 ARRAY_SIZE(pistachio_internal_dac_dais));
208 if (ret) {
209 dev_err(dev, "failed to register codec: %d\n", ret);
210 goto err_pwr;
211 }
212
213 return 0;
214
215err_pwr:
216 pm_runtime_disable(&pdev->dev);
217 pistachio_internal_dac_pwr_off(dac);
218err_regulator:
219 regulator_disable(dac->supply);
220
221 return ret;
222}
223
224static int pistachio_internal_dac_remove(struct platform_device *pdev)
225{
226 struct pistachio_internal_dac *dac = dev_get_drvdata(&pdev->dev);
227
228 snd_soc_unregister_codec(&pdev->dev);
229 pm_runtime_disable(&pdev->dev);
230 pistachio_internal_dac_pwr_off(dac);
231 regulator_disable(dac->supply);
232
233 return 0;
234}
235
236#ifdef CONFIG_PM
237static int pistachio_internal_dac_rt_resume(struct device *dev)
238{
239 struct pistachio_internal_dac *dac = dev_get_drvdata(dev);
240 int ret;
241
242 ret = regulator_enable(dac->supply);
243 if (ret) {
244 dev_err(dev, "failed to enable supply: %d\n", ret);
245 return ret;
246 }
247
248 pistachio_internal_dac_pwr_on(dac);
249
250 return 0;
251}
252
253static int pistachio_internal_dac_rt_suspend(struct device *dev)
254{
255 struct pistachio_internal_dac *dac = dev_get_drvdata(dev);
256
257 pistachio_internal_dac_pwr_off(dac);
258
259 regulator_disable(dac->supply);
260
261 return 0;
262}
263#endif
264
265static const struct dev_pm_ops pistachio_internal_dac_pm_ops = {
266 SET_RUNTIME_PM_OPS(pistachio_internal_dac_rt_suspend,
267 pistachio_internal_dac_rt_resume, NULL)
268};
269
270static const struct of_device_id pistachio_internal_dac_of_match[] = {
271 { .compatible = "img,pistachio-internal-dac" },
272 {}
273};
274MODULE_DEVICE_TABLE(of, pistachio_internal_dac_of_match);
275
276static struct platform_driver pistachio_internal_dac_plat_driver = {
277 .driver = {
278 .name = "img-pistachio-internal-dac",
279 .of_match_table = pistachio_internal_dac_of_match,
280 .pm = &pistachio_internal_dac_pm_ops
281 },
282 .probe = pistachio_internal_dac_probe,
283 .remove = pistachio_internal_dac_remove
284};
285module_platform_driver(pistachio_internal_dac_plat_driver);
286
287MODULE_DESCRIPTION("Pistachio Internal DAC driver");
288MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
289MODULE_LICENSE("GPL v2");
290
