147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/mod_devicetable.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)
|
|
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;
|
|
|
|
/* 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 void 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);
|
|
}
|
|
|
|
#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_new = 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");
|