drivers/mfd/mt6397-core.c

   1 /*
   2  * Copyright (c) 2014 MediaTek Inc.
   3  * Author: Flora Fu, MediaTek
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/interrupt.h>
  16 #include <linux/module.h>
  17 #include <linux/of_device.h>
  18 #include <linux/of_irq.h>
  19 #include <linux/regmap.h>
  20 #include <linux/mfd/core.h>
  21 #include <linux/mfd/mt6397/core.h>
  22 #include <linux/mfd/mt6397/registers.h>
  23
  24 static const struct mfd_cell mt6397_devs[] = {
  25         {
  26                 .name = "mt6397-rtc",
  27                 .of_compatible = "mediatek,mt6397-rtc",
  28         }, {
  29                 .name = "mt6397-regulator",
  30                 .of_compatible = "mediatek,mt6397-regulator",
  31         }, {
  32                 .name = "mt6397-codec",
  33                 .of_compatible = "mediatek,mt6397-codec",
  34         }, {
  35                 .name = "mt6397-clk",
  36                 .of_compatible = "mediatek,mt6397-clk",
  37         }, {
  38                 .name = "mt6397-pinctrl",
  39                 .of_compatible = "mediatek,mt6397-pinctrl",
  40         },
  41 };
  42
  43 static void mt6397_irq_lock(struct irq_data *data)
  44 {
  45         struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
  46
  47         mutex_lock(&mt6397->irqlock);
  48 }
  49
  50 static void mt6397_irq_sync_unlock(struct irq_data *data)
  51 {
  52         struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
  53
  54         regmap_write(mt6397->regmap, MT6397_INT_CON0, mt6397->irq_masks_cur[0]);
  55         regmap_write(mt6397->regmap, MT6397_INT_CON1, mt6397->irq_masks_cur[1]);
  56
  57         mutex_unlock(&mt6397->irqlock);
  58 }
  59
  60 static void mt6397_irq_disable(struct irq_data *data)
  61 {
  62         struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
  63         int shift = data->hwirq & 0xf;
  64         int reg = data->hwirq >> 4;
  65
  66         mt6397->irq_masks_cur[reg] &= ~BIT(shift);
  67 }
  68
  69 static void mt6397_irq_enable(struct irq_data *data)
  70 {
  71         struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
  72         int shift = data->hwirq & 0xf;
  73         int reg = data->hwirq >> 4;
  74
  75         mt6397->irq_masks_cur[reg] |= BIT(shift);
  76 }
  77
  78 static struct irq_chip mt6397_irq_chip = {
  79         .name = "mt6397-irq",
  80         .irq_bus_lock = mt6397_irq_lock,
  81         .irq_bus_sync_unlock = mt6397_irq_sync_unlock,
  82         .irq_enable = mt6397_irq_enable,
  83         .irq_disable = mt6397_irq_disable,
  84 };
  85
  86 static void mt6397_irq_handle_reg(struct mt6397_chip *mt6397, int reg,
  87                 int irqbase)
  88 {
  89         unsigned int status;
  90         int i, irq, ret;
  91
  92         ret = regmap_read(mt6397->regmap, reg, &status);
  93         if (ret) {
  94                 dev_err(mt6397->dev, "Failed to read irq status: %d\n", ret);
  95                 return;
  96         }
  97
  98         for (i = 0; i < 16; i++) {
  99                 if (status & BIT(i)) {
 100                         irq = irq_find_mapping(mt6397->irq_domain, irqbase + i);
 101                         if (irq)
 102                                 handle_nested_irq(irq);
 103                 }
 104         }
 105
 106         regmap_write(mt6397->regmap, reg, status);
 107 }
 108
 109 static irqreturn_t mt6397_irq_thread(int irq, void *data)
 110 {
 111         struct mt6397_chip *mt6397 = data;
 112
 113         mt6397_irq_handle_reg(mt6397, MT6397_INT_STATUS0, 0);
 114         mt6397_irq_handle_reg(mt6397, MT6397_INT_STATUS1, 16);
 115
 116         return IRQ_HANDLED;
 117 }
 118
 119 static int mt6397_irq_domain_map(struct irq_domain *d, unsigned int irq,
 120                                         irq_hw_number_t hw)
 121 {
 122         struct mt6397_chip *mt6397 = d->host_data;
 123
 124         irq_set_chip_data(irq, mt6397);
 125         irq_set_chip_and_handler(irq, &mt6397_irq_chip, handle_level_irq);
 126         irq_set_nested_thread(irq, 1);
 127 #ifdef CONFIG_ARM
 128         set_irq_flags(irq, IRQF_VALID);
 129 #else
 130         irq_set_noprobe(irq);
 131 #endif
 132
 133         return 0;
 134 }
 135
 136 static const struct irq_domain_ops mt6397_irq_domain_ops = {
 137         .map = mt6397_irq_domain_map,
 138 };
 139
 140 static int mt6397_irq_init(struct mt6397_chip *mt6397)
 141 {
 142         int ret;
 143
 144         mutex_init(&mt6397->irqlock);
 145
 146         /* Mask all interrupt sources */
 147         regmap_write(mt6397->regmap, MT6397_INT_CON0, 0x0);
 148         regmap_write(mt6397->regmap, MT6397_INT_CON1, 0x0);
 149
 150         mt6397->irq_domain = irq_domain_add_linear(mt6397->dev->of_node,
 151                 MT6397_IRQ_NR, &mt6397_irq_domain_ops, mt6397);
 152         if (!mt6397->irq_domain) {
 153                 dev_err(mt6397->dev, "could not create irq domain\n");
 154                 return -ENOMEM;
 155         }
 156
 157         ret = devm_request_threaded_irq(mt6397->dev, mt6397->irq, NULL,
 158                 mt6397_irq_thread, IRQF_ONESHOT, "mt6397-pmic", mt6397);
 159         if (ret) {
 160                 dev_err(mt6397->dev, "failed to register irq=%d; err: %d\n",
 161                         mt6397->irq, ret);
 162                 return ret;
 163         }
 164
 165         return 0;
 166 }
 167
 168 static int mt6397_probe(struct platform_device *pdev)
 169 {
 170         int ret;
 171         struct mt6397_chip *mt6397;
 172
 173         mt6397 = devm_kzalloc(&pdev->dev, sizeof(*mt6397), GFP_KERNEL);
 174         if (!mt6397)
 175                 return -ENOMEM;
 176
 177         mt6397->dev = &pdev->dev;
 178         /*
 179          * mt6397 MFD is child device of soc pmic wrapper.
 180          * Regmap is set from its parent.
 181          */
 182         mt6397->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 183         if (!mt6397->regmap)
 184                 return -ENODEV;
 185
 186         platform_set_drvdata(pdev, mt6397);
 187
 188         mt6397->irq = platform_get_irq(pdev, 0);
 189         if (mt6397->irq > 0) {
 190                 ret = mt6397_irq_init(mt6397);
 191                 if (ret)
 192                         return ret;
 193         }
 194
 195         ret = mfd_add_devices(&pdev->dev, -1, mt6397_devs,
 196                         ARRAY_SIZE(mt6397_devs), NULL, 0, NULL);
 197         if (ret)
 198                 dev_err(&pdev->dev, "failed to add child devices: %d\n", ret);
 199
 200         return ret;
 201 }
 202
 203 static int mt6397_remove(struct platform_device *pdev)
 204 {
 205         mfd_remove_devices(&pdev->dev);
 206
 207         return 0;
 208 }
 209
 210 static const struct of_device_id mt6397_of_match[] = {
 211         { .compatible = "mediatek,mt6397" },
 212         { }
 213 };
 214 MODULE_DEVICE_TABLE(of, mt6397_of_match);
 215
 216 static struct platform_driver mt6397_driver = {
 217         .probe = mt6397_probe,
 218         .remove = mt6397_remove,
 219         .driver = {
 220                 .name = "mt6397",
 221                 .of_match_table = of_match_ptr(mt6397_of_match),
 222         },
 223 };
 224
 225 module_platform_driver(mt6397_driver);
 226
 227 MODULE_AUTHOR("Flora Fu, MediaTek");
 228 MODULE_DESCRIPTION("Driver for MediaTek MT6397 PMIC");
 229 MODULE_LICENSE("GPL");
 230 MODULE_ALIAS("platform:mt6397");