1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * MFD core driver for X-Powers' AC100 Audio Codec IC
4 *
5 * The AC100 is a highly integrated audio codec and RTC subsystem designed
6 * for mobile applications. It has 3 I2S/PCM interfaces, a 2 channel DAC,
7 * a 2 channel ADC with 5 inputs and a builtin mixer. The RTC subsystem has
8 * 3 clock outputs.
9 *
10 * The audio codec and RTC parts are completely separate, sharing only the
11 * host interface for access to its registers.
12 *
13 * Copyright (2016) Chen-Yu Tsai
14 *
15 * Author: Chen-Yu Tsai <wens@csie.org>
16 */
17
18#include <linux/interrupt.h>
19#include <linux/kernel.h>
20#include <linux/mfd/core.h>
21#include <linux/mfd/ac100.h>
22#include <linux/module.h>
23#include <linux/of.h>
24#include <linux/regmap.h>
25#include <linux/sunxi-rsb.h>
26
27static const struct regmap_range ac100_writeable_ranges[] = {
28	regmap_reg_range(AC100_CHIP_AUDIO_RST, AC100_I2S_SR_CTRL),
29	regmap_reg_range(AC100_I2S1_CLK_CTRL, AC100_I2S1_MXR_GAIN),
30	regmap_reg_range(AC100_I2S2_CLK_CTRL, AC100_I2S2_MXR_GAIN),
31	regmap_reg_range(AC100_I2S3_CLK_CTRL, AC100_I2S3_SIG_PATH_CTRL),
32	regmap_reg_range(AC100_ADC_DIG_CTRL, AC100_ADC_VOL_CTRL),
33	regmap_reg_range(AC100_HMIC_CTRL1, AC100_HMIC_STATUS),
34	regmap_reg_range(AC100_DAC_DIG_CTRL, AC100_DAC_MXR_GAIN),
35	regmap_reg_range(AC100_ADC_APC_CTRL, AC100_LINEOUT_CTRL),
36	regmap_reg_range(AC100_ADC_DAP_L_CTRL, AC100_ADC_DAP_OPT),
37	regmap_reg_range(AC100_DAC_DAP_CTRL, AC100_DAC_DAP_OPT),
38	regmap_reg_range(AC100_ADC_DAP_ENA, AC100_DAC_DAP_ENA),
39	regmap_reg_range(AC100_SRC1_CTRL1, AC100_SRC1_CTRL2),
40	regmap_reg_range(AC100_SRC2_CTRL1, AC100_SRC2_CTRL2),
41	regmap_reg_range(AC100_CLK32K_ANALOG_CTRL, AC100_CLKOUT_CTRL3),
42	regmap_reg_range(AC100_RTC_RST, AC100_RTC_UPD),
43	regmap_reg_range(AC100_ALM_INT_ENA, AC100_ALM_INT_STA),
44	regmap_reg_range(AC100_ALM_SEC, AC100_RTC_GP(15)),
45};
46
47static const struct regmap_range ac100_volatile_ranges[] = {
48	regmap_reg_range(AC100_CHIP_AUDIO_RST, AC100_PLL_CTRL2),
49	regmap_reg_range(AC100_HMIC_STATUS, AC100_HMIC_STATUS),
50	regmap_reg_range(AC100_ADC_DAP_L_STA, AC100_ADC_DAP_L_STA),
51	regmap_reg_range(AC100_SRC1_CTRL1, AC100_SRC1_CTRL1),
52	regmap_reg_range(AC100_SRC1_CTRL3, AC100_SRC2_CTRL1),
53	regmap_reg_range(AC100_SRC2_CTRL3, AC100_SRC2_CTRL4),
54	regmap_reg_range(AC100_RTC_RST, AC100_RTC_RST),
55	regmap_reg_range(AC100_RTC_SEC, AC100_ALM_INT_STA),
56	regmap_reg_range(AC100_ALM_SEC, AC100_ALM_UPD),
57};
58
59static const struct regmap_access_table ac100_writeable_table = {
60	.yes_ranges	= ac100_writeable_ranges,
61	.n_yes_ranges	= ARRAY_SIZE(ac100_writeable_ranges),
62};
63
64static const struct regmap_access_table ac100_volatile_table = {
65	.yes_ranges	= ac100_volatile_ranges,
66	.n_yes_ranges	= ARRAY_SIZE(ac100_volatile_ranges),
67};
68
69static const struct regmap_config ac100_regmap_config = {
70	.reg_bits	= 8,
71	.val_bits	= 16,
72	.wr_table	= &ac100_writeable_table,
73	.volatile_table	= &ac100_volatile_table,
74	.max_register	= AC100_RTC_GP(15),
75	.cache_type	= REGCACHE_MAPLE,
76};
77
78static struct mfd_cell ac100_cells[] = {
79	{
80		.name		= "ac100-codec",
81		.of_compatible	= "x-powers,ac100-codec",
82	}, {
83		.name		= "ac100-rtc",
84		.of_compatible	= "x-powers,ac100-rtc",
85	},
86};
87
88static int ac100_rsb_probe(struct sunxi_rsb_device *rdev)
89{
90	struct ac100_dev *ac100;
91	int ret;
92
93	ac100 = devm_kzalloc(&rdev->dev, sizeof(*ac100), GFP_KERNEL);
94	if (!ac100)
95		return -ENOMEM;
96
97	ac100->dev = &rdev->dev;
98	sunxi_rsb_device_set_drvdata(rdev, ac100);
99
100	ac100->regmap = devm_regmap_init_sunxi_rsb(rdev, &ac100_regmap_config);
101	if (IS_ERR(ac100->regmap)) {
102		ret = PTR_ERR(ac100->regmap);
103		dev_err(ac100->dev, "regmap init failed: %d\n", ret);
104		return ret;
105	}
106
107	ret = devm_mfd_add_devices(ac100->dev, PLATFORM_DEVID_NONE, ac100_cells,
108				   ARRAY_SIZE(ac100_cells), NULL, 0, NULL);
109	if (ret) {
110		dev_err(ac100->dev, "failed to add MFD devices: %d\n", ret);
111		return ret;
112	}
113
114	return 0;
115}
116
117static const struct of_device_id ac100_of_match[] = {
118	{ .compatible = "x-powers,ac100" },
119	{ },
120};
121MODULE_DEVICE_TABLE(of, ac100_of_match);
122
123static struct sunxi_rsb_driver ac100_rsb_driver = {
124	.driver = {
125		.name	= "ac100",
126		.of_match_table	= of_match_ptr(ac100_of_match),
127	},
128	.probe	= ac100_rsb_probe,
129};
130module_sunxi_rsb_driver(ac100_rsb_driver);
131
132MODULE_DESCRIPTION("Audio codec MFD core driver for AC100");
133MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
134MODULE_LICENSE("GPL v2");
135