1/*
  2 * MFD core driver for X-Powers' AC100 Audio Codec IC
  3 *
  4 * The AC100 is a highly integrated audio codec and RTC subsystem designed
  5 * for mobile applications. It has 3 I2S/PCM interfaces, a 2 channel DAC,
  6 * a 2 channel ADC with 5 inputs and a builtin mixer. The RTC subsystem has
  7 * 3 clock outputs.
  8 *
  9 * The audio codec and RTC parts are completely separate, sharing only the
 10 * host interface for access to its registers.
 11 *
 12 * Copyright (2016) Chen-Yu Tsai
 13 *
 14 * Author: Chen-Yu Tsai <wens@csie.org>
 15 *
 16 * This program is free software; you can redistribute it and/or modify
 17 * it under the terms of the GNU General Public License version 2 as
 18 * published by the Free Software Foundation.
 19 */
 20
 21#include <linux/interrupt.h>
 22#include <linux/kernel.h>
 23#include <linux/mfd/core.h>
 24#include <linux/mfd/ac100.h>
 25#include <linux/module.h>
 26#include <linux/of.h>
 27#include <linux/regmap.h>
 28#include <linux/sunxi-rsb.h>
 29
 30static const struct regmap_range ac100_writeable_ranges[] = {
 31	regmap_reg_range(AC100_CHIP_AUDIO_RST, AC100_I2S_SR_CTRL),
 32	regmap_reg_range(AC100_I2S1_CLK_CTRL, AC100_I2S1_MXR_GAIN),
 33	regmap_reg_range(AC100_I2S2_CLK_CTRL, AC100_I2S2_MXR_GAIN),
 34	regmap_reg_range(AC100_I2S3_CLK_CTRL, AC100_I2S3_SIG_PATH_CTRL),
 35	regmap_reg_range(AC100_ADC_DIG_CTRL, AC100_ADC_VOL_CTRL),
 36	regmap_reg_range(AC100_HMIC_CTRL1, AC100_HMIC_STATUS),
 37	regmap_reg_range(AC100_DAC_DIG_CTRL, AC100_DAC_MXR_GAIN),
 38	regmap_reg_range(AC100_ADC_APC_CTRL, AC100_LINEOUT_CTRL),
 39	regmap_reg_range(AC100_ADC_DAP_L_CTRL, AC100_ADC_DAP_OPT),
 40	regmap_reg_range(AC100_DAC_DAP_CTRL, AC100_DAC_DAP_OPT),
 41	regmap_reg_range(AC100_ADC_DAP_ENA, AC100_DAC_DAP_ENA),
 42	regmap_reg_range(AC100_SRC1_CTRL1, AC100_SRC1_CTRL2),
 43	regmap_reg_range(AC100_SRC2_CTRL1, AC100_SRC2_CTRL2),
 44	regmap_reg_range(AC100_CLK32K_ANALOG_CTRL, AC100_CLKOUT_CTRL3),
 45	regmap_reg_range(AC100_RTC_RST, AC100_RTC_UPD),
 46	regmap_reg_range(AC100_ALM_INT_ENA, AC100_ALM_INT_STA),
 47	regmap_reg_range(AC100_ALM_SEC, AC100_RTC_GP(15)),
 48};
 49
 50static const struct regmap_range ac100_volatile_ranges[] = {
 51	regmap_reg_range(AC100_CHIP_AUDIO_RST, AC100_PLL_CTRL2),
 52	regmap_reg_range(AC100_HMIC_STATUS, AC100_HMIC_STATUS),
 53	regmap_reg_range(AC100_ADC_DAP_L_STA, AC100_ADC_DAP_L_STA),
 54	regmap_reg_range(AC100_SRC1_CTRL1, AC100_SRC1_CTRL1),
 55	regmap_reg_range(AC100_SRC1_CTRL3, AC100_SRC2_CTRL1),
 56	regmap_reg_range(AC100_SRC2_CTRL3, AC100_SRC2_CTRL4),
 57	regmap_reg_range(AC100_RTC_RST, AC100_RTC_RST),
 58	regmap_reg_range(AC100_RTC_SEC, AC100_ALM_INT_STA),
 59	regmap_reg_range(AC100_ALM_SEC, AC100_ALM_UPD),
 60};
 61
 62static const struct regmap_access_table ac100_writeable_table = {
 63	.yes_ranges	= ac100_writeable_ranges,
 64	.n_yes_ranges	= ARRAY_SIZE(ac100_writeable_ranges),
 65};
 66
 67static const struct regmap_access_table ac100_volatile_table = {
 68	.yes_ranges	= ac100_volatile_ranges,
 69	.n_yes_ranges	= ARRAY_SIZE(ac100_volatile_ranges),
 70};
 71
 72static const struct regmap_config ac100_regmap_config = {
 73	.reg_bits	= 8,
 74	.val_bits	= 16,
 75	.wr_table	= &ac100_writeable_table,
 76	.volatile_table	= &ac100_volatile_table,
 77	.max_register	= AC100_RTC_GP(15),
 78	.cache_type	= REGCACHE_RBTREE,
 79};
 80
 81static struct mfd_cell ac100_cells[] = {
 82	{
 83		.name		= "ac100-codec",
 84		.of_compatible	= "x-powers,ac100-codec",
 85	}, {
 86		.name		= "ac100-rtc",
 87		.of_compatible	= "x-powers,ac100-rtc",
 88	},
 89};
 90
 91static int ac100_rsb_probe(struct sunxi_rsb_device *rdev)
 92{
 93	struct ac100_dev *ac100;
 94	int ret;
 95
 96	ac100 = devm_kzalloc(&rdev->dev, sizeof(*ac100), GFP_KERNEL);
 97	if (!ac100)
 98		return -ENOMEM;
 99
100	ac100->dev = &rdev->dev;
101	sunxi_rsb_device_set_drvdata(rdev, ac100);
102
103	ac100->regmap = devm_regmap_init_sunxi_rsb(rdev, &ac100_regmap_config);
104	if (IS_ERR(ac100->regmap)) {
105		ret = PTR_ERR(ac100->regmap);
106		dev_err(ac100->dev, "regmap init failed: %d\n", ret);
107		return ret;
108	}
109
110	ret = devm_mfd_add_devices(ac100->dev, PLATFORM_DEVID_NONE, ac100_cells,
111				   ARRAY_SIZE(ac100_cells), NULL, 0, NULL);
112	if (ret) {
113		dev_err(ac100->dev, "failed to add MFD devices: %d\n", ret);
114		return ret;
115	}
116
117	return 0;
118}
119
120static const struct of_device_id ac100_of_match[] = {
121	{ .compatible = "x-powers,ac100" },
122	{ },
123};
124MODULE_DEVICE_TABLE(of, ac100_of_match);
125
126static struct sunxi_rsb_driver ac100_rsb_driver = {
127	.driver = {
128		.name	= "ac100",
129		.of_match_table	= of_match_ptr(ac100_of_match),
130	},
131	.probe	= ac100_rsb_probe,
132};
133module_sunxi_rsb_driver(ac100_rsb_driver);
134
135MODULE_DESCRIPTION("Audio codec MFD core driver for AC100");
136MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
137MODULE_LICENSE("GPL v2");