// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * wm8350-irq.c  --  IRQ support for Wolfson WM8350
 *
 * Copyright 2007, 2008, 2009 Wolfson Microelectronics PLC.
 *
 * Author: Liam Girdwood, Mark Brown
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/bug.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>

#include <linux/mfd/wm8350/core.h>
#include <linux/mfd/wm8350/audio.h>
#include <linux/mfd/wm8350/comparator.h>
#include <linux/mfd/wm8350/gpio.h>
#include <linux/mfd/wm8350/pmic.h>
#include <linux/mfd/wm8350/rtc.h>
#include <linux/mfd/wm8350/supply.h>
#include <linux/mfd/wm8350/wdt.h>

#define WM8350_INT_OFFSET_1                     0
#define WM8350_INT_OFFSET_2                     1
#define WM8350_POWER_UP_INT_OFFSET              2
#define WM8350_UNDER_VOLTAGE_INT_OFFSET         3
#define WM8350_OVER_CURRENT_INT_OFFSET          4
#define WM8350_GPIO_INT_OFFSET                  5
#define WM8350_COMPARATOR_INT_OFFSET            6

struct wm8350_irq_data {
        int primary;
        int reg;
        int mask;
        int primary_only;
};

static struct wm8350_irq_data wm8350_irqs[] = {
        [WM8350_IRQ_OC_LS] = {
                .primary = WM8350_OC_INT,
                .reg = WM8350_OVER_CURRENT_INT_OFFSET,
                .mask = WM8350_OC_LS_EINT,
                .primary_only = 1,
        },
        [WM8350_IRQ_UV_DC1] = {
                .primary = WM8350_UV_INT,
                .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
                .mask = WM8350_UV_DC1_EINT,
        },
        [WM8350_IRQ_UV_DC2] = {
                .primary = WM8350_UV_INT,
                .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
                .mask = WM8350_UV_DC2_EINT,
        },
        [WM8350_IRQ_UV_DC3] = {
                .primary = WM8350_UV_INT,
                .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
                .mask = WM8350_UV_DC3_EINT,
        },
        [WM8350_IRQ_UV_DC4] = {
                .primary = WM8350_UV_INT,
                .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
                .mask = WM8350_UV_DC4_EINT,
        },
        [WM8350_IRQ_UV_DC5] = {
                .primary = WM8350_UV_INT,
                .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
                .mask = WM8350_UV_DC5_EINT,
        },
        [WM8350_IRQ_UV_DC6] = {
                .primary = WM8350_UV_INT,
                .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
                .mask = WM8350_UV_DC6_EINT,
        },
        [WM8350_IRQ_UV_LDO1] = {
                .primary = WM8350_UV_INT,
                .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
                .mask = WM8350_UV_LDO1_EINT,
        },
        [WM8350_IRQ_UV_LDO2] = {
                .primary = WM8350_UV_INT,
                .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
                .mask = WM8350_UV_LDO2_EINT,
        },
        [WM8350_IRQ_UV_LDO3] = {
                .primary = WM8350_UV_INT,
                .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
                .mask = WM8350_UV_LDO3_EINT,
        },
        [WM8350_IRQ_UV_LDO4] = {
                .primary = WM8350_UV_INT,
                .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
                .mask = WM8350_UV_LDO4_EINT,
        },
        [WM8350_IRQ_CHG_BAT_HOT] = {
                .primary = WM8350_CHG_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_CHG_BAT_HOT_EINT,
        },
        [WM8350_IRQ_CHG_BAT_COLD] = {
                .primary = WM8350_CHG_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_CHG_BAT_COLD_EINT,
        },
        [WM8350_IRQ_CHG_BAT_FAIL] = {
                .primary = WM8350_CHG_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_CHG_BAT_FAIL_EINT,
        },
        [WM8350_IRQ_CHG_TO] = {
                .primary = WM8350_CHG_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_CHG_TO_EINT,
        },
        [WM8350_IRQ_CHG_END] = {
                .primary = WM8350_CHG_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_CHG_END_EINT,
        },
        [WM8350_IRQ_CHG_START] = {
                .primary = WM8350_CHG_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_CHG_START_EINT,
        },
        [WM8350_IRQ_CHG_FAST_RDY] = {
                .primary = WM8350_CHG_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_CHG_FAST_RDY_EINT,
        },
        [WM8350_IRQ_CHG_VBATT_LT_3P9] = {
                .primary = WM8350_CHG_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_CHG_VBATT_LT_3P9_EINT,
        },
        [WM8350_IRQ_CHG_VBATT_LT_3P1] = {
                .primary = WM8350_CHG_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_CHG_VBATT_LT_3P1_EINT,
        },
        [WM8350_IRQ_CHG_VBATT_LT_2P85] = {
                .primary = WM8350_CHG_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_CHG_VBATT_LT_2P85_EINT,
        },
        [WM8350_IRQ_RTC_ALM] = {
                .primary = WM8350_RTC_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_RTC_ALM_EINT,
        },
        [WM8350_IRQ_RTC_SEC] = {
                .primary = WM8350_RTC_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_RTC_SEC_EINT,
        },
        [WM8350_IRQ_RTC_PER] = {
                .primary = WM8350_RTC_INT,
                .reg = WM8350_INT_OFFSET_1,
                .mask = WM8350_RTC_PER_EINT,
        },
        [WM8350_IRQ_CS1] = {
                .primary = WM8350_CS_INT,
                .reg = WM8350_INT_OFFSET_2,
                .mask = WM8350_CS1_EINT,
        },
        [WM8350_IRQ_CS2] = {
                .primary = WM8350_CS_INT,
                .reg = WM8350_INT_OFFSET_2,
                .mask = WM8350_CS2_EINT,
        },
        [WM8350_IRQ_SYS_HYST_COMP_FAIL] = {
                .primary = WM8350_SYS_INT,
                .reg = WM8350_INT_OFFSET_2,
                .mask = WM8350_SYS_HYST_COMP_FAIL_EINT,
        },
        [WM8350_IRQ_SYS_CHIP_GT115] = {
                .primary = WM8350_SYS_INT,
                .reg = WM8350_INT_OFFSET_2,
                .mask = WM8350_SYS_CHIP_GT115_EINT,
        },
        [WM8350_IRQ_SYS_CHIP_GT140] = {
                .primary = WM8350_SYS_INT,
                .reg = WM8350_INT_OFFSET_2,
                .mask = WM8350_SYS_CHIP_GT140_EINT,
        },
        [WM8350_IRQ_SYS_WDOG_TO] = {
                .primary = WM8350_SYS_INT,
                .reg = WM8350_INT_OFFSET_2,
                .mask = WM8350_SYS_WDOG_TO_EINT,
        },
        [WM8350_IRQ_AUXADC_DATARDY] = {
                .primary = WM8350_AUXADC_INT,
                .reg = WM8350_INT_OFFSET_2,
                .mask = WM8350_AUXADC_DATARDY_EINT,
        },
        [WM8350_IRQ_AUXADC_DCOMP4] = {
                .primary = WM8350_AUXADC_INT,
                .reg = WM8350_INT_OFFSET_2,
                .mask = WM8350_AUXADC_DCOMP4_EINT,
        },
        [WM8350_IRQ_AUXADC_DCOMP3] = {
                .primary = WM8350_AUXADC_INT,
                .reg = WM8350_INT_OFFSET_2,
                .mask = WM8350_AUXADC_DCOMP3_EINT,
        },
        [WM8350_IRQ_AUXADC_DCOMP2] = {
                .primary = WM8350_AUXADC_INT,
                .reg = WM8350_INT_OFFSET_2,
                .mask = WM8350_AUXADC_DCOMP2_EINT,
        },
        [WM8350_IRQ_AUXADC_DCOMP1] = {
                .primary = WM8350_AUXADC_INT,
                .reg = WM8350_INT_OFFSET_2,
                .mask = WM8350_AUXADC_DCOMP1_EINT,
        },
        [WM8350_IRQ_USB_LIMIT] = {
                .primary = WM8350_USB_INT,
                .reg = WM8350_INT_OFFSET_2,
                .mask = WM8350_USB_LIMIT_EINT,
                .primary_only = 1,
        },
        [WM8350_IRQ_WKUP_OFF_STATE] = {
                .primary = WM8350_WKUP_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_WKUP_OFF_STATE_EINT,
        },
        [WM8350_IRQ_WKUP_HIB_STATE] = {
                .primary = WM8350_WKUP_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_WKUP_HIB_STATE_EINT,
        },
        [WM8350_IRQ_WKUP_CONV_FAULT] = {
                .primary = WM8350_WKUP_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_WKUP_CONV_FAULT_EINT,
        },
        [WM8350_IRQ_WKUP_WDOG_RST] = {
                .primary = WM8350_WKUP_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_WKUP_WDOG_RST_EINT,
        },
        [WM8350_IRQ_WKUP_GP_PWR_ON] = {
                .primary = WM8350_WKUP_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_WKUP_GP_PWR_ON_EINT,
        },
        [WM8350_IRQ_WKUP_ONKEY] = {
                .primary = WM8350_WKUP_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_WKUP_ONKEY_EINT,
        },
        [WM8350_IRQ_WKUP_GP_WAKEUP] = {
                .primary = WM8350_WKUP_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_WKUP_GP_WAKEUP_EINT,
        },
        [WM8350_IRQ_CODEC_JCK_DET_L] = {
                .primary = WM8350_CODEC_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_CODEC_JCK_DET_L_EINT,
        },
        [WM8350_IRQ_CODEC_JCK_DET_R] = {
                .primary = WM8350_CODEC_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_CODEC_JCK_DET_R_EINT,
        },
        [WM8350_IRQ_CODEC_MICSCD] = {
                .primary = WM8350_CODEC_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_CODEC_MICSCD_EINT,
        },
        [WM8350_IRQ_CODEC_MICD] = {
                .primary = WM8350_CODEC_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_CODEC_MICD_EINT,
        },
        [WM8350_IRQ_EXT_USB_FB] = {
                .primary = WM8350_EXT_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_EXT_USB_FB_EINT,
        },
        [WM8350_IRQ_EXT_WALL_FB] = {
                .primary = WM8350_EXT_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_EXT_WALL_FB_EINT,
        },
        [WM8350_IRQ_EXT_BAT_FB] = {
                .primary = WM8350_EXT_INT,
                .reg = WM8350_COMPARATOR_INT_OFFSET,
                .mask = WM8350_EXT_BAT_FB_EINT,
        },
        [WM8350_IRQ_GPIO(0)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP0_EINT,
        },
        [WM8350_IRQ_GPIO(1)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP1_EINT,
        },
        [WM8350_IRQ_GPIO(2)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP2_EINT,
        },
        [WM8350_IRQ_GPIO(3)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP3_EINT,
        },
        [WM8350_IRQ_GPIO(4)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP4_EINT,
        },
        [WM8350_IRQ_GPIO(5)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP5_EINT,
        },
        [WM8350_IRQ_GPIO(6)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP6_EINT,
        },
        [WM8350_IRQ_GPIO(7)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP7_EINT,
        },
        [WM8350_IRQ_GPIO(8)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP8_EINT,
        },
        [WM8350_IRQ_GPIO(9)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP9_EINT,
        },
        [WM8350_IRQ_GPIO(10)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP10_EINT,
        },
        [WM8350_IRQ_GPIO(11)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP11_EINT,
        },
        [WM8350_IRQ_GPIO(12)] = {
                .primary = WM8350_GP_INT,
                .reg = WM8350_GPIO_INT_OFFSET,
                .mask = WM8350_GP12_EINT,
        },
};

static inline struct wm8350_irq_data *irq_to_wm8350_irq(struct wm8350 *wm8350,
                                                        int irq)
{
        return &wm8350_irqs[irq - wm8350->irq_base];
}

/*
 * This is a threaded IRQ handler so can access I2C/SPI.  Since all
 * interrupts are clear on read the IRQ line will be reasserted and
 * the physical IRQ will be handled again if another interrupt is
 * asserted while we run - in the normal course of events this is a
 * rare occurrence so we save I2C/SPI reads.  We're also assuming that
 * it's rare to get lots of interrupts firing simultaneously so try to
 * minimise I/O.
 */
static irqreturn_t wm8350_irq(int irq, void *irq_data)
{
        struct wm8350 *wm8350 = irq_data;
        u16 level_one;
        u16 sub_reg[WM8350_NUM_IRQ_REGS];
        int read_done[WM8350_NUM_IRQ_REGS];
        struct wm8350_irq_data *data;
        int i;

        level_one = wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS)
                & ~wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK);

        if (!level_one)
                return IRQ_NONE;

        memset(&read_done, 0, sizeof(read_done));

        for (i = 0; i < ARRAY_SIZE(wm8350_irqs); i++) {
                data = &wm8350_irqs[i];

                if (!(level_one & data->primary))
                        continue;

                if (!read_done[data->reg]) {
                        sub_reg[data->reg] =
                                wm8350_reg_read(wm8350, WM8350_INT_STATUS_1 +
                                                data->reg);
                        sub_reg[data->reg] &= ~wm8350->irq_masks[data->reg];
                        read_done[data->reg] = 1;
                }

                if (sub_reg[data->reg] & data->mask)
                        handle_nested_irq(wm8350->irq_base + i);
        }

        return IRQ_HANDLED;
}

static void wm8350_irq_lock(struct irq_data *data)
{
        struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);

        mutex_lock(&wm8350->irq_lock);
}

static void wm8350_irq_sync_unlock(struct irq_data *data)
{
        struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
        int i;

        for (i = 0; i < ARRAY_SIZE(wm8350->irq_masks); i++) {
                /* If there's been a change in the mask write it back
                 * to the hardware. */
                WARN_ON(regmap_update_bits(wm8350->regmap,
                                           WM8350_INT_STATUS_1_MASK + i,
                                           0xffff, wm8350->irq_masks[i]));
        }

        mutex_unlock(&wm8350->irq_lock);
}

static void wm8350_irq_enable(struct irq_data *data)
{
        struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
        struct wm8350_irq_data *irq_data = irq_to_wm8350_irq(wm8350,
                                                             data->irq);

        wm8350->irq_masks[irq_data->reg] &= ~irq_data->mask;
}

static void wm8350_irq_disable(struct irq_data *data)
{
        struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
        struct wm8350_irq_data *irq_data = irq_to_wm8350_irq(wm8350,
                                                             data->irq);

        wm8350->irq_masks[irq_data->reg] |= irq_data->mask;
}

static struct irq_chip wm8350_irq_chip = {
        .name                   = "wm8350",
        .irq_bus_lock           = wm8350_irq_lock,
        .irq_bus_sync_unlock    = wm8350_irq_sync_unlock,
        .irq_disable            = wm8350_irq_disable,
        .irq_enable             = wm8350_irq_enable,
};

int wm8350_irq_init(struct wm8350 *wm8350, int irq,
                    struct wm8350_platform_data *pdata)
{
        int ret, cur_irq, i;
        int flags = IRQF_ONESHOT;
        int irq_base = -1;

        if (!irq) {
                dev_warn(wm8350->dev, "No interrupt support, no core IRQ\n");
                return 0;
        }

        /* Mask top level interrupts */
        wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0xFFFF);

        /* Mask all individual interrupts by default and cache the
         * masks.  We read the masks back since there are unwritable
         * bits in the mask registers. */
        for (i = 0; i < ARRAY_SIZE(wm8350->irq_masks); i++) {
                wm8350_reg_write(wm8350, WM8350_INT_STATUS_1_MASK + i,
                                 0xFFFF);
                wm8350->irq_masks[i] =
                        wm8350_reg_read(wm8350,
                                        WM8350_INT_STATUS_1_MASK + i);
        }

        mutex_init(&wm8350->irq_lock);
        wm8350->chip_irq = irq;

        if (pdata && pdata->irq_base > 0)
                irq_base = pdata->irq_base;

        wm8350->irq_base =
                irq_alloc_descs(irq_base, 0, ARRAY_SIZE(wm8350_irqs), 0);
        if (wm8350->irq_base < 0) {
                dev_warn(wm8350->dev, "Allocating irqs failed with %d\n",
                        wm8350->irq_base);
                return 0;
        }

        if (pdata && pdata->irq_high) {
                flags |= IRQF_TRIGGER_HIGH;

                wm8350_set_bits(wm8350, WM8350_SYSTEM_CONTROL_1,
                                WM8350_IRQ_POL);
        } else {
                flags |= IRQF_TRIGGER_LOW;

                wm8350_clear_bits(wm8350, WM8350_SYSTEM_CONTROL_1,
                                  WM8350_IRQ_POL);
        }

        /* Register with genirq */
        for (cur_irq = wm8350->irq_base;
             cur_irq < ARRAY_SIZE(wm8350_irqs) + wm8350->irq_base;
             cur_irq++) {
                irq_set_chip_data(cur_irq, wm8350);
                irq_set_chip_and_handler(cur_irq, &wm8350_irq_chip,
                                         handle_edge_irq);
                irq_set_nested_thread(cur_irq, 1);

                irq_clear_status_flags(cur_irq, IRQ_NOREQUEST | IRQ_NOPROBE);
        }

        ret = request_threaded_irq(irq, NULL, wm8350_irq, flags,
                                   "wm8350", wm8350);
        if (ret != 0)
                dev_err(wm8350->dev, "Failed to request IRQ: %d\n", ret);

        /* Allow interrupts to fire */
        wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0);

        return ret;
}

int wm8350_irq_exit(struct wm8350 *wm8350)
{
        free_irq(wm8350->chip_irq, wm8350);
        return 0;
}