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 */
42struct pistachio_internal_dac {
43	struct regmap *regmap;
44	struct regulator *supply;
45	bool mute;
46};
47
48static const struct snd_kcontrol_new pistachio_internal_dac_snd_controls[] = {
49	SOC_SINGLE("Playback Switch", PISTACHIO_INTERNAL_DAC_CTRL, 2, 1, 1)
50};
51
52static 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
58static const struct snd_soc_dapm_route pistachio_internal_dac_routes[] = {
59	{ "AOUTL", NULL, "DAC" },
60	{ "AOUTR", NULL, "DAC" },
61};
62
63static 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
82static 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
92static 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
109static 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
122static 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
131static 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
143static 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
209err_pwr:
210	pm_runtime_disable(&pdev->dev);
211	pistachio_internal_dac_pwr_off(dac);
212err_regulator:
213	regulator_disable(dac->supply);
214
215	return ret;
216}
217
218static 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
228static 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
244static 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
256static 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
261static const struct of_device_id pistachio_internal_dac_of_match[] = {
262	{ .compatible = "img,pistachio-internal-dac" },
263	{}
264};
265MODULE_DEVICE_TABLE(of, pistachio_internal_dac_of_match);
266
267static 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};
276module_platform_driver(pistachio_internal_dac_plat_driver);
277
278MODULE_DESCRIPTION("Pistachio Internal DAC driver");
279MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
280MODULE_LICENSE("GPL v2");
281