drivers/platform/x86/intel_bxtwc_tmu.c

   1 /*
   2  * intel_bxtwc_tmu.c - Intel BXT Whiskey Cove PMIC TMU driver
   3  *
   4  * Copyright (C) 2016 Intel Corporation. All rights reserved.
   5  *
   6  * This driver adds TMU (Time Management Unit) support for Intel BXT platform.
   7  * It enables the alarm wake-up functionality in the TMU unit of Whiskey Cove
   8  * PMIC.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License version
  12  * 2 as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/mfd/intel_soc_pmic.h>
  25
  26 #define BXTWC_TMUIRQ            0x4fb6
  27 #define BXTWC_MIRQLVL1          0x4e0e
  28 #define BXTWC_MTMUIRQ_REG       0x4fb7
  29 #define BXTWC_MIRQLVL1_MTMU     BIT(1)
  30 #define BXTWC_TMU_WK_ALRM       BIT(1)
  31 #define BXTWC_TMU_SYS_ALRM      BIT(2)
  32 #define BXTWC_TMU_ALRM_MASK     (BXTWC_TMU_WK_ALRM | BXTWC_TMU_SYS_ALRM)
  33 #define BXTWC_TMU_ALRM_IRQ      (BXTWC_TMU_WK_ALRM | BXTWC_TMU_SYS_ALRM)
  34
  35 struct wcove_tmu {
  36         int irq;
  37         struct device *dev;
  38         struct regmap *regmap;
  39 };
  40
  41 static irqreturn_t bxt_wcove_tmu_irq_handler(int irq, void *data)
  42 {
  43         struct wcove_tmu *wctmu = data;
  44         unsigned int tmu_irq;
  45
  46         /* Read TMU interrupt reg */
  47         regmap_read(wctmu->regmap, BXTWC_TMUIRQ, &tmu_irq);
  48         if (tmu_irq & BXTWC_TMU_ALRM_IRQ) {
  49                 /* clear TMU irq */
  50                 regmap_write(wctmu->regmap, BXTWC_TMUIRQ, tmu_irq);
  51                 return IRQ_HANDLED;
  52         }
  53         return IRQ_NONE;
  54 }
  55
  56 static int bxt_wcove_tmu_probe(struct platform_device *pdev)
  57 {
  58         struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
  59         struct regmap_irq_chip_data *regmap_irq_chip;
  60         struct wcove_tmu *wctmu;
  61         int ret, virq, irq;
  62
  63         wctmu = devm_kzalloc(&pdev->dev, sizeof(*wctmu), GFP_KERNEL);
  64         if (!wctmu)
  65                 return -ENOMEM;
  66
  67         wctmu->dev = &pdev->dev;
  68         wctmu->regmap = pmic->regmap;
  69
  70         irq = platform_get_irq(pdev, 0);
  71
  72         if (irq < 0) {
  73                 dev_err(&pdev->dev, "invalid irq %d\n", irq);
  74                 return irq;
  75         }
  76
  77         regmap_irq_chip = pmic->irq_chip_data_tmu;
  78         virq = regmap_irq_get_virq(regmap_irq_chip, irq);
  79         if (virq < 0) {
  80                 dev_err(&pdev->dev,
  81                         "failed to get virtual interrupt=%d\n", irq);
  82                 return virq;
  83         }
  84
  85         ret = devm_request_threaded_irq(&pdev->dev, virq,
  86                                         NULL, bxt_wcove_tmu_irq_handler,
  87                                         IRQF_ONESHOT, "bxt_wcove_tmu", wctmu);
  88         if (ret) {
  89                 dev_err(&pdev->dev, "request irq failed: %d,virq: %d\n",
  90                                                         ret, virq);
  91                 return ret;
  92         }
  93         wctmu->irq = virq;
  94
  95         /* Enable TMU interrupts */
  96         regmap_update_bits(wctmu->regmap, BXTWC_MIRQLVL1,
  97                                   BXTWC_MIRQLVL1_MTMU, 0);
  98
  99         /* Unmask TMU second level Wake & System alarm */
 100         regmap_update_bits(wctmu->regmap, BXTWC_MTMUIRQ_REG,
 101                                   BXTWC_TMU_ALRM_MASK, 0);
 102
 103         platform_set_drvdata(pdev, wctmu);
 104         return 0;
 105 }
 106
 107 static int bxt_wcove_tmu_remove(struct platform_device *pdev)
 108 {
 109         struct wcove_tmu *wctmu = platform_get_drvdata(pdev);
 110         unsigned int val;
 111
 112         /* Mask TMU interrupts */
 113         regmap_read(wctmu->regmap, BXTWC_MIRQLVL1, &val);
 114         regmap_write(wctmu->regmap, BXTWC_MIRQLVL1,
 115                         val | BXTWC_MIRQLVL1_MTMU);
 116         regmap_read(wctmu->regmap, BXTWC_MTMUIRQ_REG, &val);
 117         regmap_write(wctmu->regmap, BXTWC_MTMUIRQ_REG,
 118                         val | BXTWC_TMU_ALRM_MASK);
 119         return 0;
 120 }
 121
 122 #ifdef CONFIG_PM_SLEEP
 123 static int bxtwc_tmu_suspend(struct device *dev)
 124 {
 125         struct wcove_tmu *wctmu = dev_get_drvdata(dev);
 126
 127         enable_irq_wake(wctmu->irq);
 128         return 0;
 129 }
 130
 131 static int bxtwc_tmu_resume(struct device *dev)
 132 {
 133         struct wcove_tmu *wctmu = dev_get_drvdata(dev);
 134
 135         disable_irq_wake(wctmu->irq);
 136         return 0;
 137 }
 138 #endif
 139
 140 static SIMPLE_DEV_PM_OPS(bxtwc_tmu_pm_ops, bxtwc_tmu_suspend, bxtwc_tmu_resume);
 141
 142 static const struct platform_device_id bxt_wcove_tmu_id_table[] = {
 143         { .name = "bxt_wcove_tmu" },
 144         {},
 145 };
 146 MODULE_DEVICE_TABLE(platform, bxt_wcove_tmu_id_table);
 147
 148 static struct platform_driver bxt_wcove_tmu_driver = {
 149         .probe = bxt_wcove_tmu_probe,
 150         .remove = bxt_wcove_tmu_remove,
 151         .driver = {
 152                 .name = "bxt_wcove_tmu",
 153                 .pm     = &bxtwc_tmu_pm_ops,
 154         },
 155         .id_table = bxt_wcove_tmu_id_table,
 156 };
 157
 158 module_platform_driver(bxt_wcove_tmu_driver);
 159
 160 MODULE_LICENSE("GPL v2");
 161 MODULE_AUTHOR("Nilesh Bacchewar <nilesh.bacchewar@intel.com>");
 162 MODULE_DESCRIPTION("BXT Whiskey Cove TMU Driver");