159 lines
4.1 KiB
C
159 lines
4.1 KiB
C
/*
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* intel_bxtwc_tmu.c - Intel BXT Whiskey Cove PMIC TMU driver
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*
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* Copyright (C) 2016 Intel Corporation. All rights reserved.
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*
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* This driver adds TMU (Time Management Unit) support for Intel BXT platform.
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* It enables the alarm wake-up functionality in the TMU unit of Whiskey Cove
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* PMIC.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/intel_soc_pmic.h>
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#define BXTWC_TMUIRQ 0x4fb6
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#define BXTWC_MIRQLVL1 0x4e0e
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#define BXTWC_MTMUIRQ_REG 0x4fb7
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#define BXTWC_MIRQLVL1_MTMU BIT(1)
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#define BXTWC_TMU_WK_ALRM BIT(1)
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#define BXTWC_TMU_SYS_ALRM BIT(2)
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#define BXTWC_TMU_ALRM_MASK (BXTWC_TMU_WK_ALRM | BXTWC_TMU_SYS_ALRM)
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#define BXTWC_TMU_ALRM_IRQ (BXTWC_TMU_WK_ALRM | BXTWC_TMU_SYS_ALRM)
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struct wcove_tmu {
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int irq;
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struct device *dev;
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struct regmap *regmap;
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};
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static irqreturn_t bxt_wcove_tmu_irq_handler(int irq, void *data)
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{
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struct wcove_tmu *wctmu = data;
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unsigned int tmu_irq;
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/* Read TMU interrupt reg */
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regmap_read(wctmu->regmap, BXTWC_TMUIRQ, &tmu_irq);
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if (tmu_irq & BXTWC_TMU_ALRM_IRQ) {
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/* clear TMU irq */
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regmap_write(wctmu->regmap, BXTWC_TMUIRQ, tmu_irq);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static int bxt_wcove_tmu_probe(struct platform_device *pdev)
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{
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struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
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struct regmap_irq_chip_data *regmap_irq_chip;
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struct wcove_tmu *wctmu;
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int ret, virq, irq;
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wctmu = devm_kzalloc(&pdev->dev, sizeof(*wctmu), GFP_KERNEL);
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if (!wctmu)
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return -ENOMEM;
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wctmu->dev = &pdev->dev;
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wctmu->regmap = pmic->regmap;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "invalid irq %d\n", irq);
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return irq;
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}
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regmap_irq_chip = pmic->irq_chip_data_tmu;
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virq = regmap_irq_get_virq(regmap_irq_chip, irq);
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if (virq < 0) {
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dev_err(&pdev->dev,
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"failed to get virtual interrupt=%d\n", irq);
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return virq;
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}
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ret = devm_request_threaded_irq(&pdev->dev, virq,
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NULL, bxt_wcove_tmu_irq_handler,
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IRQF_ONESHOT, "bxt_wcove_tmu", wctmu);
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if (ret) {
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dev_err(&pdev->dev, "request irq failed: %d,virq: %d\n",
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ret, virq);
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return ret;
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}
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wctmu->irq = virq;
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/* Unmask TMU second level Wake & System alarm */
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regmap_update_bits(wctmu->regmap, BXTWC_MTMUIRQ_REG,
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BXTWC_TMU_ALRM_MASK, 0);
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platform_set_drvdata(pdev, wctmu);
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return 0;
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}
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static int bxt_wcove_tmu_remove(struct platform_device *pdev)
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{
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struct wcove_tmu *wctmu = platform_get_drvdata(pdev);
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unsigned int val;
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/* Mask TMU interrupts */
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regmap_read(wctmu->regmap, BXTWC_MIRQLVL1, &val);
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regmap_write(wctmu->regmap, BXTWC_MIRQLVL1,
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val | BXTWC_MIRQLVL1_MTMU);
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regmap_read(wctmu->regmap, BXTWC_MTMUIRQ_REG, &val);
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regmap_write(wctmu->regmap, BXTWC_MTMUIRQ_REG,
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val | BXTWC_TMU_ALRM_MASK);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int bxtwc_tmu_suspend(struct device *dev)
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{
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struct wcove_tmu *wctmu = dev_get_drvdata(dev);
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enable_irq_wake(wctmu->irq);
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return 0;
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}
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static int bxtwc_tmu_resume(struct device *dev)
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{
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struct wcove_tmu *wctmu = dev_get_drvdata(dev);
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disable_irq_wake(wctmu->irq);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(bxtwc_tmu_pm_ops, bxtwc_tmu_suspend, bxtwc_tmu_resume);
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static const struct platform_device_id bxt_wcove_tmu_id_table[] = {
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{ .name = "bxt_wcove_tmu" },
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{},
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};
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MODULE_DEVICE_TABLE(platform, bxt_wcove_tmu_id_table);
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static struct platform_driver bxt_wcove_tmu_driver = {
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.probe = bxt_wcove_tmu_probe,
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.remove = bxt_wcove_tmu_remove,
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.driver = {
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.name = "bxt_wcove_tmu",
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.pm = &bxtwc_tmu_pm_ops,
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},
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.id_table = bxt_wcove_tmu_id_table,
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};
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module_platform_driver(bxt_wcove_tmu_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Nilesh Bacchewar <nilesh.bacchewar@intel.com>");
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MODULE_DESCRIPTION("BXT Whiskey Cove TMU Driver");
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