Nilesh Bacchewar | 957ae50 | 2016-11-07 12:11:47 -0800 | [diff] [blame] | 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 | |
Nilesh Bacchewar | 957ae50 | 2016-11-07 12:11:47 -0800 | [diff] [blame] | 95 | /* Unmask TMU second level Wake & System alarm */ |
| 96 | regmap_update_bits(wctmu->regmap, BXTWC_MTMUIRQ_REG, |
| 97 | BXTWC_TMU_ALRM_MASK, 0); |
| 98 | |
| 99 | platform_set_drvdata(pdev, wctmu); |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | static int bxt_wcove_tmu_remove(struct platform_device *pdev) |
| 104 | { |
| 105 | struct wcove_tmu *wctmu = platform_get_drvdata(pdev); |
| 106 | unsigned int val; |
| 107 | |
| 108 | /* Mask TMU interrupts */ |
| 109 | regmap_read(wctmu->regmap, BXTWC_MIRQLVL1, &val); |
| 110 | regmap_write(wctmu->regmap, BXTWC_MIRQLVL1, |
| 111 | val | BXTWC_MIRQLVL1_MTMU); |
| 112 | regmap_read(wctmu->regmap, BXTWC_MTMUIRQ_REG, &val); |
| 113 | regmap_write(wctmu->regmap, BXTWC_MTMUIRQ_REG, |
| 114 | val | BXTWC_TMU_ALRM_MASK); |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | #ifdef CONFIG_PM_SLEEP |
| 119 | static int bxtwc_tmu_suspend(struct device *dev) |
| 120 | { |
| 121 | struct wcove_tmu *wctmu = dev_get_drvdata(dev); |
| 122 | |
| 123 | enable_irq_wake(wctmu->irq); |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | static int bxtwc_tmu_resume(struct device *dev) |
| 128 | { |
| 129 | struct wcove_tmu *wctmu = dev_get_drvdata(dev); |
| 130 | |
| 131 | disable_irq_wake(wctmu->irq); |
| 132 | return 0; |
| 133 | } |
| 134 | #endif |
| 135 | |
| 136 | static SIMPLE_DEV_PM_OPS(bxtwc_tmu_pm_ops, bxtwc_tmu_suspend, bxtwc_tmu_resume); |
| 137 | |
| 138 | static const struct platform_device_id bxt_wcove_tmu_id_table[] = { |
| 139 | { .name = "bxt_wcove_tmu" }, |
| 140 | {}, |
| 141 | }; |
| 142 | MODULE_DEVICE_TABLE(platform, bxt_wcove_tmu_id_table); |
| 143 | |
| 144 | static struct platform_driver bxt_wcove_tmu_driver = { |
| 145 | .probe = bxt_wcove_tmu_probe, |
| 146 | .remove = bxt_wcove_tmu_remove, |
| 147 | .driver = { |
| 148 | .name = "bxt_wcove_tmu", |
| 149 | .pm = &bxtwc_tmu_pm_ops, |
| 150 | }, |
| 151 | .id_table = bxt_wcove_tmu_id_table, |
| 152 | }; |
| 153 | |
| 154 | module_platform_driver(bxt_wcove_tmu_driver); |
| 155 | |
| 156 | MODULE_LICENSE("GPL v2"); |
| 157 | MODULE_AUTHOR("Nilesh Bacchewar <nilesh.bacchewar@intel.com>"); |
| 158 | MODULE_DESCRIPTION("BXT Whiskey Cove TMU Driver"); |