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/mt6323/core.h>
  23 #include <linux/mfd/mt6397/registers.h>
  24 #include <linux/mfd/mt6323/registers.h>
  25
  26 #define MT6397_RTC_BASE         0xe000
  27 #define MT6397_RTC_SIZE         0x3e
  28
  29 #define MT6323_CID_CODE         0x23
  30 #define MT6391_CID_CODE         0x91
  31 #define MT6397_CID_CODE         0x97
  32
  33 static const struct resource mt6397_rtc_resources[] = {
  34         {
  35                 .start = MT6397_RTC_BASE,
  36                 .end   = MT6397_RTC_BASE + MT6397_RTC_SIZE,
  37                 .flags = IORESOURCE_MEM,
  38         },
  39         {
  40                 .start = MT6397_IRQ_RTC,
  41                 .end   = MT6397_IRQ_RTC,
  42                 .flags = IORESOURCE_IRQ,
  43         },
  44 };
  45
  46 static const struct resource mt6323_keys_resources[] = {
  47         DEFINE_RES_IRQ(MT6323_IRQ_STATUS_PWRKEY),
  48         DEFINE_RES_IRQ(MT6323_IRQ_STATUS_FCHRKEY),
  49 };
  50
  51 static const struct resource mt6397_keys_resources[] = {
  52         DEFINE_RES_IRQ(MT6397_IRQ_PWRKEY),
  53         DEFINE_RES_IRQ(MT6397_IRQ_HOMEKEY),
  54 };
  55
  56 static const struct mfd_cell mt6323_devs[] = {
  57         {
  58                 .name = "mt6323-regulator",
  59                 .of_compatible = "mediatek,mt6323-regulator"
  60         }, {
  61                 .name = "mt6323-led",
  62                 .of_compatible = "mediatek,mt6323-led"
  63         }, {
  64                 .name = "mtk-pmic-keys",
  65                 .num_resources = ARRAY_SIZE(mt6323_keys_resources),
  66                 .resources = mt6323_keys_resources,
  67                 .of_compatible = "mediatek,mt6323-keys"
  68         },
  69 };
  70
  71 static const struct mfd_cell mt6397_devs[] = {
  72         {
  73                 .name = "mt6397-rtc",
  74                 .num_resources = ARRAY_SIZE(mt6397_rtc_resources),
  75                 .resources = mt6397_rtc_resources,
  76                 .of_compatible = "mediatek,mt6397-rtc",
  77         }, {
  78                 .name = "mt6397-regulator",
  79                 .of_compatible = "mediatek,mt6397-regulator",
  80         }, {
  81                 .name = "mt6397-codec",
  82                 .of_compatible = "mediatek,mt6397-codec",
  83         }, {
  84                 .name = "mt6397-clk",
  85                 .of_compatible = "mediatek,mt6397-clk",
  86         }, {
  87                 .name = "mt6397-pinctrl",
  88                 .of_compatible = "mediatek,mt6397-pinctrl",
  89         }, {
  90                 .name = "mtk-pmic-keys",
  91                 .num_resources = ARRAY_SIZE(mt6397_keys_resources),
  92                 .resources = mt6397_keys_resources,
  93                 .of_compatible = "mediatek,mt6397-keys"
  94         }
  95 };
  96
  97 static void mt6397_irq_lock(struct irq_data *data)
  98 {
  99         struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
 100
 101         mutex_lock(&mt6397->irqlock);
 102 }
 103
 104 static void mt6397_irq_sync_unlock(struct irq_data *data)
 105 {
 106         struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
 107
 108         regmap_write(mt6397->regmap, mt6397->int_con[0],
 109                      mt6397->irq_masks_cur[0]);
 110         regmap_write(mt6397->regmap, mt6397->int_con[1],
 111                      mt6397->irq_masks_cur[1]);
 112
 113         mutex_unlock(&mt6397->irqlock);
 114 }
 115
 116 static void mt6397_irq_disable(struct irq_data *data)
 117 {
 118         struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
 119         int shift = data->hwirq & 0xf;
 120         int reg = data->hwirq >> 4;
 121
 122         mt6397->irq_masks_cur[reg] &= ~BIT(shift);
 123 }
 124
 125 static void mt6397_irq_enable(struct irq_data *data)
 126 {
 127         struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
 128         int shift = data->hwirq & 0xf;
 129         int reg = data->hwirq >> 4;
 130
 131         mt6397->irq_masks_cur[reg] |= BIT(shift);
 132 }
 133
 134 #ifdef CONFIG_PM_SLEEP
 135 static int mt6397_irq_set_wake(struct irq_data *irq_data, unsigned int on)
 136 {
 137         struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(irq_data);
 138         int shift = irq_data->hwirq & 0xf;
 139         int reg = irq_data->hwirq >> 4;
 140
 141         if (on)
 142                 mt6397->wake_mask[reg] |= BIT(shift);
 143         else
 144                 mt6397->wake_mask[reg] &= ~BIT(shift);
 145
 146         return 0;
 147 }
 148 #else
 149 #define mt6397_irq_set_wake NULL
 150 #endif
 151
 152 static struct irq_chip mt6397_irq_chip = {
 153         .name = "mt6397-irq",
 154         .irq_bus_lock = mt6397_irq_lock,
 155         .irq_bus_sync_unlock = mt6397_irq_sync_unlock,
 156         .irq_enable = mt6397_irq_enable,
 157         .irq_disable = mt6397_irq_disable,
 158         .irq_set_wake = mt6397_irq_set_wake,
 159 };
 160
 161 static void mt6397_irq_handle_reg(struct mt6397_chip *mt6397, int reg,
 162                 int irqbase)
 163 {
 164         unsigned int status;
 165         int i, irq, ret;
 166
 167         ret = regmap_read(mt6397->regmap, reg, &status);
 168         if (ret) {
 169                 dev_err(mt6397->dev, "Failed to read irq status: %d\n", ret);
 170                 return;
 171         }
 172
 173         for (i = 0; i < 16; i++) {
 174                 if (status & BIT(i)) {
 175                         irq = irq_find_mapping(mt6397->irq_domain, irqbase + i);
 176                         if (irq)
 177                                 handle_nested_irq(irq);
 178                 }
 179         }
 180
 181         regmap_write(mt6397->regmap, reg, status);
 182 }
 183
 184 static irqreturn_t mt6397_irq_thread(int irq, void *data)
 185 {
 186         struct mt6397_chip *mt6397 = data;
 187
 188         mt6397_irq_handle_reg(mt6397, mt6397->int_status[0], 0);
 189         mt6397_irq_handle_reg(mt6397, mt6397->int_status[1], 16);
 190
 191         return IRQ_HANDLED;
 192 }
 193
 194 static int mt6397_irq_domain_map(struct irq_domain *d, unsigned int irq,
 195                                         irq_hw_number_t hw)
 196 {
 197         struct mt6397_chip *mt6397 = d->host_data;
 198
 199         irq_set_chip_data(irq, mt6397);
 200         irq_set_chip_and_handler(irq, &mt6397_irq_chip, handle_level_irq);
 201         irq_set_nested_thread(irq, 1);
 202         irq_set_noprobe(irq);
 203
 204         return 0;
 205 }
 206
 207 static const struct irq_domain_ops mt6397_irq_domain_ops = {
 208         .map = mt6397_irq_domain_map,
 209 };
 210
 211 static int mt6397_irq_init(struct mt6397_chip *mt6397)
 212 {
 213         int ret;
 214
 215         mutex_init(&mt6397->irqlock);
 216
 217         /* Mask all interrupt sources */
 218         regmap_write(mt6397->regmap, mt6397->int_con[0], 0x0);
 219         regmap_write(mt6397->regmap, mt6397->int_con[1], 0x0);
 220
 221         mt6397->irq_domain = irq_domain_add_linear(mt6397->dev->of_node,
 222                 MT6397_IRQ_NR, &mt6397_irq_domain_ops, mt6397);
 223         if (!mt6397->irq_domain) {
 224                 dev_err(mt6397->dev, "could not create irq domain\n");
 225                 return -ENOMEM;
 226         }
 227
 228         ret = devm_request_threaded_irq(mt6397->dev, mt6397->irq, NULL,
 229                 mt6397_irq_thread, IRQF_ONESHOT, "mt6397-pmic", mt6397);
 230         if (ret) {
 231                 dev_err(mt6397->dev, "failed to register irq=%d; err: %d\n",
 232                         mt6397->irq, ret);
 233                 return ret;
 234         }
 235
 236         return 0;
 237 }
 238
 239 #ifdef CONFIG_PM_SLEEP
 240 static int mt6397_irq_suspend(struct device *dev)
 241 {
 242         struct mt6397_chip *chip = dev_get_drvdata(dev);
 243
 244         regmap_write(chip->regmap, chip->int_con[0], chip->wake_mask[0]);
 245         regmap_write(chip->regmap, chip->int_con[1], chip->wake_mask[1]);
 246
 247         enable_irq_wake(chip->irq);
 248
 249         return 0;
 250 }
 251
 252 static int mt6397_irq_resume(struct device *dev)
 253 {
 254         struct mt6397_chip *chip = dev_get_drvdata(dev);
 255
 256         regmap_write(chip->regmap, chip->int_con[0], chip->irq_masks_cur[0]);
 257         regmap_write(chip->regmap, chip->int_con[1], chip->irq_masks_cur[1]);
 258
 259         disable_irq_wake(chip->irq);
 260
 261         return 0;
 262 }
 263 #endif
 264
 265 static SIMPLE_DEV_PM_OPS(mt6397_pm_ops, mt6397_irq_suspend,
 266                         mt6397_irq_resume);
 267
 268 static int mt6397_probe(struct platform_device *pdev)
 269 {
 270         int ret;
 271         unsigned int id;
 272         struct mt6397_chip *pmic;
 273
 274         pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
 275         if (!pmic)
 276                 return -ENOMEM;
 277
 278         pmic->dev = &pdev->dev;
 279
 280         /*
 281          * mt6397 MFD is child device of soc pmic wrapper.
 282          * Regmap is set from its parent.
 283          */
 284         pmic->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 285         if (!pmic->regmap)
 286                 return -ENODEV;
 287
 288         platform_set_drvdata(pdev, pmic);
 289
 290         ret = regmap_read(pmic->regmap, MT6397_CID, &id);
 291         if (ret) {
 292                 dev_err(pmic->dev, "Failed to read chip id: %d\n", ret);
 293                 return ret;
 294         }
 295
 296         pmic->irq = platform_get_irq(pdev, 0);
 297         if (pmic->irq <= 0)
 298                 return pmic->irq;
 299
 300         switch (id & 0xff) {
 301         case MT6323_CID_CODE:
 302                 pmic->int_con[0] = MT6323_INT_CON0;
 303                 pmic->int_con[1] = MT6323_INT_CON1;
 304                 pmic->int_status[0] = MT6323_INT_STATUS0;
 305                 pmic->int_status[1] = MT6323_INT_STATUS1;
 306                 ret = mt6397_irq_init(pmic);
 307                 if (ret)
 308                         return ret;
 309
 310                 ret = devm_mfd_add_devices(&pdev->dev, -1, mt6323_devs,
 311                                            ARRAY_SIZE(mt6323_devs), NULL,
 312                                            0, pmic->irq_domain);
 313                 break;
 314
 315         case MT6397_CID_CODE:
 316         case MT6391_CID_CODE:
 317                 pmic->int_con[0] = MT6397_INT_CON0;
 318                 pmic->int_con[1] = MT6397_INT_CON1;
 319                 pmic->int_status[0] = MT6397_INT_STATUS0;
 320                 pmic->int_status[1] = MT6397_INT_STATUS1;
 321                 ret = mt6397_irq_init(pmic);
 322                 if (ret)
 323                         return ret;
 324
 325                 ret = devm_mfd_add_devices(&pdev->dev, -1, mt6397_devs,
 326                                            ARRAY_SIZE(mt6397_devs), NULL,
 327                                            0, pmic->irq_domain);
 328                 break;
 329
 330         default:
 331                 dev_err(&pdev->dev, "unsupported chip: %d\n", id);
 332                 return -ENODEV;
 333         }
 334
 335         if (ret) {
 336                 irq_domain_remove(pmic->irq_domain);
 337                 dev_err(&pdev->dev, "failed to add child devices: %d\n", ret);
 338         }
 339
 340         return ret;
 341 }
 342
 343 static const struct of_device_id mt6397_of_match[] = {
 344         { .compatible = "mediatek,mt6397" },
 345         { .compatible = "mediatek,mt6323" },
 346         { }
 347 };
 348 MODULE_DEVICE_TABLE(of, mt6397_of_match);
 349
 350 static const struct platform_device_id mt6397_id[] = {
 351         { "mt6397", 0 },
 352         { },
 353 };
 354 MODULE_DEVICE_TABLE(platform, mt6397_id);
 355
 356 static struct platform_driver mt6397_driver = {
 357         .probe = mt6397_probe,
 358         .driver = {
 359                 .name = "mt6397",
 360                 .of_match_table = of_match_ptr(mt6397_of_match),
 361                 .pm = &mt6397_pm_ops,
 362         },
 363         .id_table = mt6397_id,
 364 };
 365
 366 module_platform_driver(mt6397_driver);
 367
 368 MODULE_AUTHOR("Flora Fu, MediaTek");
 369 MODULE_DESCRIPTION("Driver for MediaTek MT6397 PMIC");
 370 MODULE_LICENSE("GPL");