drivers/mfd/ac100.c

   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
  27 static 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
  47 static 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
  59 static 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
  64 static 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
  69 static 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_RBTREE,
  76 };
  77
  78 static 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
  88 static 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
 117 static const struct of_device_id ac100_of_match[] = {
 118         { .compatible = "x-powers,ac100" },
 119         { },
 120 };
 121 MODULE_DEVICE_TABLE(of, ac100_of_match);
 122
 123 static 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 };
 130 module_sunxi_rsb_driver(ac100_rsb_driver);
 131
 132 MODULE_DESCRIPTION("Audio codec MFD core driver for AC100");
 133 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
 134 MODULE_LICENSE("GPL v2");