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 #define MT6397_RTC_BASE         0xe000
  25 #define MT6397_RTC_SIZE         0x3e
  26
  27 static const struct resource mt6397_rtc_resources[] = {
  28         {
  29                 .start = MT6397_RTC_BASE,
  30                 .end   = MT6397_RTC_BASE + MT6397_RTC_SIZE,
  31                 .flags = IORESOURCE_MEM,
  32         },
  33         {
  34                 .start = MT6397_IRQ_RTC,
  35                 .end   = MT6397_IRQ_RTC,
  36                 .flags = IORESOURCE_IRQ,
  37         },
  38 };
  39
  40 static const struct mfd_cell mt6397_devs[] = {
  41         {
  42                 .name = "mt6397-rtc",
  43                 .num_resources = ARRAY_SIZE(mt6397_rtc_resources),
  44                 .resources = mt6397_rtc_resources,
  45                 .of_compatible = "mediatek,mt6397-rtc",
  46         }, {
  47                 .name = "mt6397-regulator",
  48                 .of_compatible = "mediatek,mt6397-regulator",
  49         }, {
  50                 .name = "mt6397-codec",
  51                 .of_compatible = "mediatek,mt6397-codec",
  52         }, {
  53                 .name = "mt6397-clk",
  54                 .of_compatible = "mediatek,mt6397-clk",
  55         }, {
  56                 .name = "mt6397-pinctrl",
  57                 .of_compatible = "mediatek,mt6397-pinctrl",
  58         },
  59 };
  60
  61 static void mt6397_irq_lock(struct irq_data *data)
  62 {
  63         struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
  64
  65         mutex_lock(&mt6397->irqlock);
  66 }
  67
  68 static void mt6397_irq_sync_unlock(struct irq_data *data)
  69 {
  70         struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
  71
  72         regmap_write(mt6397->regmap, MT6397_INT_CON0, mt6397->irq_masks_cur[0]);
  73         regmap_write(mt6397->regmap, MT6397_INT_CON1, mt6397->irq_masks_cur[1]);
  74
  75         mutex_unlock(&mt6397->irqlock);
  76 }
  77
  78 static void mt6397_irq_disable(struct irq_data *data)
  79 {
  80         struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
  81         int shift = data->hwirq & 0xf;
  82         int reg = data->hwirq >> 4;
  83
  84         mt6397->irq_masks_cur[reg] &= ~BIT(shift);
  85 }
  86
  87 static void mt6397_irq_enable(struct irq_data *data)
  88 {
  89         struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
  90         int shift = data->hwirq & 0xf;
  91         int reg = data->hwirq >> 4;
  92
  93         mt6397->irq_masks_cur[reg] |= BIT(shift);
  94 }
  95
  96 static struct irq_chip mt6397_irq_chip = {
  97         .name = "mt6397-irq",
  98         .irq_bus_lock = mt6397_irq_lock,
  99         .irq_bus_sync_unlock = mt6397_irq_sync_unlock,
 100         .irq_enable = mt6397_irq_enable,
 101         .irq_disable = mt6397_irq_disable,
 102 };
 103
 104 static void mt6397_irq_handle_reg(struct mt6397_chip *mt6397, int reg,
 105                 int irqbase)
 106 {
 107         unsigned int status;
 108         int i, irq, ret;
 109
 110         ret = regmap_read(mt6397->regmap, reg, &status);
 111         if (ret) {
 112                 dev_err(mt6397->dev, "Failed to read irq status: %d\n", ret);
 113                 return;
 114         }
 115
 116         for (i = 0; i < 16; i++) {
 117                 if (status & BIT(i)) {
 118                         irq = irq_find_mapping(mt6397->irq_domain, irqbase + i);
 119                         if (irq)
 120                                 handle_nested_irq(irq);
 121                 }
 122         }
 123
 124         regmap_write(mt6397->regmap, reg, status);
 125 }
 126
 127 static irqreturn_t mt6397_irq_thread(int irq, void *data)
 128 {
 129         struct mt6397_chip *mt6397 = data;
 130
 131         mt6397_irq_handle_reg(mt6397, MT6397_INT_STATUS0, 0);
 132         mt6397_irq_handle_reg(mt6397, MT6397_INT_STATUS1, 16);
 133
 134         return IRQ_HANDLED;
 135 }
 136
 137 static int mt6397_irq_domain_map(struct irq_domain *d, unsigned int irq,
 138                                         irq_hw_number_t hw)
 139 {
 140         struct mt6397_chip *mt6397 = d->host_data;
 141
 142         irq_set_chip_data(irq, mt6397);
 143         irq_set_chip_and_handler(irq, &mt6397_irq_chip, handle_level_irq);
 144         irq_set_nested_thread(irq, 1);
 145 #ifdef CONFIG_ARM
 146         set_irq_flags(irq, IRQF_VALID);
 147 #else
 148         irq_set_noprobe(irq);
 149 #endif
 150
 151         return 0;
 152 }
 153
 154 static const struct irq_domain_ops mt6397_irq_domain_ops = {
 155         .map = mt6397_irq_domain_map,
 156 };
 157
 158 static int mt6397_irq_init(struct mt6397_chip *mt6397)
 159 {
 160         int ret;
 161
 162         mutex_init(&mt6397->irqlock);
 163
 164         /* Mask all interrupt sources */
 165         regmap_write(mt6397->regmap, MT6397_INT_CON0, 0x0);
 166         regmap_write(mt6397->regmap, MT6397_INT_CON1, 0x0);
 167
 168         mt6397->irq_domain = irq_domain_add_linear(mt6397->dev->of_node,
 169                 MT6397_IRQ_NR, &mt6397_irq_domain_ops, mt6397);
 170         if (!mt6397->irq_domain) {
 171                 dev_err(mt6397->dev, "could not create irq domain\n");
 172                 return -ENOMEM;
 173         }
 174
 175         ret = devm_request_threaded_irq(mt6397->dev, mt6397->irq, NULL,
 176                 mt6397_irq_thread, IRQF_ONESHOT, "mt6397-pmic", mt6397);
 177         if (ret) {
 178                 dev_err(mt6397->dev, "failed to register irq=%d; err: %d\n",
 179                         mt6397->irq, ret);
 180                 return ret;
 181         }
 182
 183         return 0;
 184 }
 185
 186 static int mt6397_probe(struct platform_device *pdev)
 187 {
 188         int ret;
 189         struct mt6397_chip *mt6397;
 190
 191         mt6397 = devm_kzalloc(&pdev->dev, sizeof(*mt6397), GFP_KERNEL);
 192         if (!mt6397)
 193                 return -ENOMEM;
 194
 195         mt6397->dev = &pdev->dev;
 196         /*
 197          * mt6397 MFD is child device of soc pmic wrapper.
 198          * Regmap is set from its parent.
 199          */
 200         mt6397->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 201         if (!mt6397->regmap)
 202                 return -ENODEV;
 203
 204         platform_set_drvdata(pdev, mt6397);
 205
 206         mt6397->irq = platform_get_irq(pdev, 0);
 207         if (mt6397->irq > 0) {
 208                 ret = mt6397_irq_init(mt6397);
 209                 if (ret)
 210                         return ret;
 211         }
 212
 213         ret = mfd_add_devices(&pdev->dev, -1, mt6397_devs,
 214                         ARRAY_SIZE(mt6397_devs), NULL, 0, NULL);
 215         if (ret)
 216                 dev_err(&pdev->dev, "failed to add child devices: %d\n", ret);
 217
 218         return ret;
 219 }
 220
 221 static int mt6397_remove(struct platform_device *pdev)
 222 {
 223         mfd_remove_devices(&pdev->dev);
 224
 225         return 0;
 226 }
 227
 228 static const struct of_device_id mt6397_of_match[] = {
 229         { .compatible = "mediatek,mt6397" },
 230         { }
 231 };
 232 MODULE_DEVICE_TABLE(of, mt6397_of_match);
 233
 234 static struct platform_driver mt6397_driver = {
 235         .probe = mt6397_probe,
 236         .remove = mt6397_remove,
 237         .driver = {
 238                 .name = "mt6397",
 239                 .of_match_table = of_match_ptr(mt6397_of_match),
 240         },
 241 };
 242
 243 module_platform_driver(mt6397_driver);
 244
 245 MODULE_AUTHOR("Flora Fu, MediaTek");
 246 MODULE_DESCRIPTION("Driver for MediaTek MT6397 PMIC");
 247 MODULE_LICENSE("GPL");
 248 MODULE_ALIAS("platform:mt6397");