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