linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Gemini power management controller

 * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>

 *

 * Inspired by code from the SL3516 board support by Jason Lee

 * Inspired by code from Janos Laube <janos.dev@gmail.com>

 */

#include <linux/of.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

#include <linux/pm.h>

#include <linux/bitops.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/reboot.h>

​

#define GEMINI_PWC_ID       0x00010500

#define GEMINI_PWC_IDREG    0x00

#define GEMINI_PWC_CTRLREG  0x04

#define GEMINI_PWC_STATREG  0x08

​

#define GEMINI_CTRL_SHUTDOWN    BIT(0)

#define GEMINI_CTRL_ENABLE  BIT(1)

#define GEMINI_CTRL_IRQ_CLR BIT(2)

​

#define GEMINI_STAT_CIR     BIT(4)

#define GEMINI_STAT_RTC     BIT(5)

#define GEMINI_STAT_POWERBUTTON BIT(6)

​

struct gemini_powercon {

        struct device           *dev;

        void __iomem            *base;

};

​

static irqreturn_t gemini_powerbutton_interrupt(int irq, void *data)

{

    struct gemini_powercon *gpw = data;

    u32 val;

​

    /* ACK the IRQ */

    val = readl(gpw->base + GEMINI_PWC_CTRLREG);

    val |= GEMINI_CTRL_IRQ_CLR;

    writel(val, gpw->base + GEMINI_PWC_CTRLREG);

​

    val = readl(gpw->base + GEMINI_PWC_STATREG);

    val &= 0x70U;

    switch (val) {

    case GEMINI_STAT_CIR:

        /*

         * We do not yet have a driver for the infrared

         * controller so it can cause spurious poweroff

         * events. Ignore those for now.

         */

        dev_info(gpw->dev, "infrared poweroff - ignored\n");

        break;

    case GEMINI_STAT_RTC:

        dev_info(gpw->dev, "RTC poweroff\n");

        orderly_poweroff(true);

        break;

    case GEMINI_STAT_POWERBUTTON:

        dev_info(gpw->dev, "poweroff button pressed\n");

        orderly_poweroff(true);