drm/client: Fix drm client endless Kconfig loop

[drm/drm-misc.git] / drivers / iio / adc / xilinx-ams.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Xilinx AMS driver
 *
 *  Copyright (C) 2021 Xilinx, Inc.
 *
 *  Manish Narani <mnarani@xilinx.com>
 *  Rajnikant Bhojani <rajnikant.bhojani@xilinx.com>
 */

#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/devm-helpers.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/overflow.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/slab.h>

#include <linux/iio/events.h>
#include <linux/iio/iio.h>

/* AMS registers definitions */
#define AMS_ISR_0                       0x010
#define AMS_ISR_1                       0x014
#define AMS_IER_0                       0x020
#define AMS_IER_1                       0x024
#define AMS_IDR_0                       0x028
#define AMS_IDR_1                       0x02C
#define AMS_PS_CSTS                     0x040
#define AMS_PL_CSTS                     0x044

#define AMS_VCC_PSPLL0                  0x060
#define AMS_VCC_PSPLL3                  0x06C
#define AMS_VCCINT                      0x078
#define AMS_VCCBRAM                     0x07C
#define AMS_VCCAUX                      0x080
#define AMS_PSDDRPLL                    0x084
#define AMS_PSINTFPDDR                  0x09C

#define AMS_VCC_PSPLL0_CH               48
#define AMS_VCC_PSPLL3_CH               51
#define AMS_VCCINT_CH                   54
#define AMS_VCCBRAM_CH                  55
#define AMS_VCCAUX_CH                   56
#define AMS_PSDDRPLL_CH                 57
#define AMS_PSINTFPDDR_CH               63

#define AMS_REG_CONFIG0                 0x100
#define AMS_REG_CONFIG1                 0x104
#define AMS_REG_CONFIG3                 0x10C
#define AMS_REG_CONFIG4                 0x110
#define AMS_REG_SEQ_CH0                 0x120
#define AMS_REG_SEQ_CH1                 0x124
#define AMS_REG_SEQ_CH2                 0x118

#define AMS_VUSER0_MASK                 BIT(0)
#define AMS_VUSER1_MASK                 BIT(1)
#define AMS_VUSER2_MASK                 BIT(2)
#define AMS_VUSER3_MASK                 BIT(3)

#define AMS_TEMP                        0x000
#define AMS_SUPPLY1                     0x004
#define AMS_SUPPLY2                     0x008
#define AMS_VP_VN                       0x00C
#define AMS_VREFP                       0x010
#define AMS_VREFN                       0x014
#define AMS_SUPPLY3                     0x018
#define AMS_SUPPLY4                     0x034
#define AMS_SUPPLY5                     0x038
#define AMS_SUPPLY6                     0x03C
#define AMS_SUPPLY7                     0x200
#define AMS_SUPPLY8                     0x204
#define AMS_SUPPLY9                     0x208
#define AMS_SUPPLY10                    0x20C
#define AMS_VCCAMS                      0x210
#define AMS_TEMP_REMOTE                 0x214

#define AMS_REG_VAUX(x)                 (0x40 + 4 * (x))

#define AMS_PS_RESET_VALUE              0xFFFF
#define AMS_PL_RESET_VALUE              0xFFFF

#define AMS_CONF0_CHANNEL_NUM_MASK      GENMASK(6, 0)

#define AMS_CONF1_SEQ_MASK              GENMASK(15, 12)
#define AMS_CONF1_SEQ_DEFAULT           FIELD_PREP(AMS_CONF1_SEQ_MASK, 0)
#define AMS_CONF1_SEQ_CONTINUOUS        FIELD_PREP(AMS_CONF1_SEQ_MASK, 2)
#define AMS_CONF1_SEQ_SINGLE_CHANNEL    FIELD_PREP(AMS_CONF1_SEQ_MASK, 3)

#define AMS_REG_SEQ0_MASK               GENMASK(15, 0)
#define AMS_REG_SEQ2_MASK               GENMASK(21, 16)
#define AMS_REG_SEQ1_MASK               GENMASK_ULL(37, 22)

#define AMS_PS_SEQ_MASK                 GENMASK(21, 0)
#define AMS_PL_SEQ_MASK                 GENMASK_ULL(59, 22)

#define AMS_ALARM_TEMP                  0x140
#define AMS_ALARM_SUPPLY1               0x144
#define AMS_ALARM_SUPPLY2               0x148
#define AMS_ALARM_SUPPLY3               0x160
#define AMS_ALARM_SUPPLY4               0x164
#define AMS_ALARM_SUPPLY5               0x168
#define AMS_ALARM_SUPPLY6               0x16C
#define AMS_ALARM_SUPPLY7               0x180
#define AMS_ALARM_SUPPLY8               0x184
#define AMS_ALARM_SUPPLY9               0x188
#define AMS_ALARM_SUPPLY10              0x18C
#define AMS_ALARM_VCCAMS                0x190
#define AMS_ALARM_TEMP_REMOTE           0x194
#define AMS_ALARM_THRESHOLD_OFF_10      0x10
#define AMS_ALARM_THRESHOLD_OFF_20      0x20

#define AMS_ALARM_THR_DIRECT_MASK       BIT(1)
#define AMS_ALARM_THR_MIN               0x0000
#define AMS_ALARM_THR_MAX               (BIT(16) - 1)

#define AMS_ALARM_MASK                  GENMASK_ULL(63, 0)
#define AMS_NO_OF_ALARMS                32
#define AMS_PL_ALARM_START              16
#define AMS_PL_ALARM_MASK               GENMASK(31, 16)
#define AMS_ISR0_ALARM_MASK             GENMASK(31, 0)
#define AMS_ISR1_ALARM_MASK             (GENMASK(31, 29) | GENMASK(4, 0))
#define AMS_ISR1_EOC_MASK               BIT(3)
#define AMS_ISR1_INTR_MASK              GENMASK_ULL(63, 32)
#define AMS_ISR0_ALARM_2_TO_0_MASK      GENMASK(2, 0)
#define AMS_ISR0_ALARM_6_TO_3_MASK      GENMASK(6, 3)
#define AMS_ISR0_ALARM_12_TO_7_MASK     GENMASK(13, 8)
#define AMS_CONF1_ALARM_2_TO_0_MASK     GENMASK(3, 1)
#define AMS_CONF1_ALARM_6_TO_3_MASK     GENMASK(11, 8)
#define AMS_CONF1_ALARM_12_TO_7_MASK    GENMASK(5, 0)
#define AMS_REGCFG1_ALARM_MASK  \
        (AMS_CONF1_ALARM_2_TO_0_MASK | AMS_CONF1_ALARM_6_TO_3_MASK | BIT(0))
#define AMS_REGCFG3_ALARM_MASK          AMS_CONF1_ALARM_12_TO_7_MASK

#define AMS_PS_CSTS_PS_READY            (BIT(27) | BIT(16))
#define AMS_PL_CSTS_ACCESS_MASK         BIT(1)

#define AMS_PL_MAX_FIXED_CHANNEL        10
#define AMS_PL_MAX_EXT_CHANNEL          20

#define AMS_INIT_POLL_TIME_US           200
#define AMS_INIT_TIMEOUT_US             10000
#define AMS_UNMASK_TIMEOUT_MS           500

/*
 * Following scale and offset value is derived from
 * UG580 (v1.7) December 20, 2016
 */
#define AMS_SUPPLY_SCALE_1VOLT_mV               1000
#define AMS_SUPPLY_SCALE_3VOLT_mV               3000
#define AMS_SUPPLY_SCALE_6VOLT_mV               6000
#define AMS_SUPPLY_SCALE_DIV_BIT        16

#define AMS_TEMP_SCALE                  509314
#define AMS_TEMP_SCALE_DIV_BIT          16
#define AMS_TEMP_OFFSET                 -((280230LL << 16) / 509314)

enum ams_alarm_bit {
        AMS_ALARM_BIT_TEMP = 0,
        AMS_ALARM_BIT_SUPPLY1 = 1,
        AMS_ALARM_BIT_SUPPLY2 = 2,
        AMS_ALARM_BIT_SUPPLY3 = 3,
        AMS_ALARM_BIT_SUPPLY4 = 4,
        AMS_ALARM_BIT_SUPPLY5 = 5,
        AMS_ALARM_BIT_SUPPLY6 = 6,
        AMS_ALARM_BIT_RESERVED = 7,
        AMS_ALARM_BIT_SUPPLY7 = 8,
        AMS_ALARM_BIT_SUPPLY8 = 9,
        AMS_ALARM_BIT_SUPPLY9 = 10,
        AMS_ALARM_BIT_SUPPLY10 = 11,
        AMS_ALARM_BIT_VCCAMS = 12,
        AMS_ALARM_BIT_TEMP_REMOTE = 13,
};

enum ams_seq {
        AMS_SEQ_VCC_PSPLL = 0,
        AMS_SEQ_VCC_PSBATT = 1,
        AMS_SEQ_VCCINT = 2,
        AMS_SEQ_VCCBRAM = 3,
        AMS_SEQ_VCCAUX = 4,
        AMS_SEQ_PSDDRPLL = 5,
        AMS_SEQ_INTDDR = 6,
};

enum ams_ps_pl_seq {
        AMS_SEQ_CALIB = 0,
        AMS_SEQ_RSVD_1 = 1,
        AMS_SEQ_RSVD_2 = 2,
        AMS_SEQ_TEST = 3,
        AMS_SEQ_RSVD_4 = 4,
        AMS_SEQ_SUPPLY4 = 5,
        AMS_SEQ_SUPPLY5 = 6,
        AMS_SEQ_SUPPLY6 = 7,
        AMS_SEQ_TEMP = 8,
        AMS_SEQ_SUPPLY2 = 9,
        AMS_SEQ_SUPPLY1 = 10,
        AMS_SEQ_VP_VN = 11,
        AMS_SEQ_VREFP = 12,
        AMS_SEQ_VREFN = 13,
        AMS_SEQ_SUPPLY3 = 14,
        AMS_SEQ_CURRENT_MON = 15,
        AMS_SEQ_SUPPLY7 = 16,
        AMS_SEQ_SUPPLY8 = 17,
        AMS_SEQ_SUPPLY9 = 18,
        AMS_SEQ_SUPPLY10 = 19,
        AMS_SEQ_VCCAMS = 20,
        AMS_SEQ_TEMP_REMOTE = 21,
        AMS_SEQ_MAX = 22
};

#define AMS_PS_SEQ_MAX          AMS_SEQ_MAX
#define AMS_SEQ(x)              (AMS_SEQ_MAX + (x))
#define PS_SEQ(x)               (x)
#define PL_SEQ(x)               (AMS_PS_SEQ_MAX + (x))
#define AMS_CTRL_SEQ_BASE       (AMS_PS_SEQ_MAX * 3)

#define AMS_CHAN_TEMP(_scan_index, _addr, _name) { \
        .type = IIO_TEMP, \
        .indexed = 1, \
        .address = (_addr), \
        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
                BIT(IIO_CHAN_INFO_SCALE) | \
                BIT(IIO_CHAN_INFO_OFFSET), \
        .event_spec = ams_temp_events, \
        .scan_index = _scan_index, \
        .num_event_specs = ARRAY_SIZE(ams_temp_events), \
        .datasheet_name = _name, \
}

#define AMS_CHAN_VOLTAGE(_scan_index, _addr, _alarm, _name) { \
        .type = IIO_VOLTAGE, \
        .indexed = 1, \
        .address = (_addr), \
        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
                BIT(IIO_CHAN_INFO_SCALE), \
        .event_spec = (_alarm) ? ams_voltage_events : NULL, \
        .scan_index = _scan_index, \
        .num_event_specs = (_alarm) ? ARRAY_SIZE(ams_voltage_events) : 0, \
        .datasheet_name = _name, \
}

#define AMS_PS_CHAN_TEMP(_scan_index, _addr, _name) \
        AMS_CHAN_TEMP(PS_SEQ(_scan_index), _addr, _name)
#define AMS_PS_CHAN_VOLTAGE(_scan_index, _addr, _name) \
        AMS_CHAN_VOLTAGE(PS_SEQ(_scan_index), _addr, true, _name)

#define AMS_PL_CHAN_TEMP(_scan_index, _addr, _name) \
        AMS_CHAN_TEMP(PL_SEQ(_scan_index), _addr, _name)
#define AMS_PL_CHAN_VOLTAGE(_scan_index, _addr, _alarm, _name) \
        AMS_CHAN_VOLTAGE(PL_SEQ(_scan_index), _addr, _alarm, _name)
#define AMS_PL_AUX_CHAN_VOLTAGE(_auxno) \
        AMS_CHAN_VOLTAGE(PL_SEQ(AMS_SEQ(_auxno)), AMS_REG_VAUX(_auxno), false, \
                         "VAUX" #_auxno)
#define AMS_CTRL_CHAN_VOLTAGE(_scan_index, _addr, _name) \
        AMS_CHAN_VOLTAGE(PL_SEQ(AMS_SEQ(AMS_SEQ(_scan_index))), _addr, false, \
                         _name)

/**
 * struct ams - This structure contains necessary state for xilinx-ams to operate
 * @base: physical base address of device
 * @ps_base: physical base address of PS device
 * @pl_base: physical base address of PL device
 * @clk: clocks associated with the device
 * @dev: pointer to device struct
 * @lock: to handle multiple user interaction
 * @intr_lock: to protect interrupt mask values
 * @alarm_mask: alarm configuration
 * @current_masked_alarm: currently masked due to alarm
 * @intr_mask: interrupt configuration
 * @ams_unmask_work: re-enables event once the event condition disappears
 *
 */
struct ams {
        void __iomem *base;
        void __iomem *ps_base;
        void __iomem *pl_base;
        struct clk *clk;
        struct device *dev;
        struct mutex lock;
        spinlock_t intr_lock;
        unsigned int alarm_mask;
        unsigned int current_masked_alarm;
        u64 intr_mask;
        struct delayed_work ams_unmask_work;
};

static inline void ams_ps_update_reg(struct ams *ams, unsigned int offset,
                                     u32 mask, u32 data)
{
        u32 val, regval;

        val = readl(ams->ps_base + offset);
        regval = (val & ~mask) | (data & mask);
        writel(regval, ams->ps_base + offset);
}

static inline void ams_pl_update_reg(struct ams *ams, unsigned int offset,
                                     u32 mask, u32 data)
{
        u32 val, regval;

        val = readl(ams->pl_base + offset);
        regval = (val & ~mask) | (data & mask);
        writel(regval, ams->pl_base + offset);
}

static void ams_update_intrmask(struct ams *ams, u64 mask, u64 val)
{
        u32 regval;

        ams->intr_mask = (ams->intr_mask & ~mask) | (val & mask);

        regval = ~(ams->intr_mask | ams->current_masked_alarm);
        writel(regval, ams->base + AMS_IER_0);

        regval = ~(FIELD_GET(AMS_ISR1_INTR_MASK, ams->intr_mask));
        writel(regval, ams->base + AMS_IER_1);

        regval = ams->intr_mask | ams->current_masked_alarm;
        writel(regval, ams->base + AMS_IDR_0);

        regval = FIELD_GET(AMS_ISR1_INTR_MASK, ams->intr_mask);
        writel(regval, ams->base + AMS_IDR_1);
}

static void ams_disable_all_alarms(struct ams *ams)
{
        /* disable PS module alarm */
        if (ams->ps_base) {
                ams_ps_update_reg(ams, AMS_REG_CONFIG1, AMS_REGCFG1_ALARM_MASK,
                                  AMS_REGCFG1_ALARM_MASK);
                ams_ps_update_reg(ams, AMS_REG_CONFIG3, AMS_REGCFG3_ALARM_MASK,
                                  AMS_REGCFG3_ALARM_MASK);
        }

        /* disable PL module alarm */
        if (ams->pl_base) {
                ams_pl_update_reg(ams, AMS_REG_CONFIG1, AMS_REGCFG1_ALARM_MASK,
                                  AMS_REGCFG1_ALARM_MASK);
                ams_pl_update_reg(ams, AMS_REG_CONFIG3, AMS_REGCFG3_ALARM_MASK,
                                  AMS_REGCFG3_ALARM_MASK);
        }
}

static void ams_update_ps_alarm(struct ams *ams, unsigned long alarm_mask)
{
        u32 cfg;
        u32 val;

        val = FIELD_GET(AMS_ISR0_ALARM_2_TO_0_MASK, alarm_mask);
        cfg = ~(FIELD_PREP(AMS_CONF1_ALARM_2_TO_0_MASK, val));

        val = FIELD_GET(AMS_ISR0_ALARM_6_TO_3_MASK, alarm_mask);
        cfg &= ~(FIELD_PREP(AMS_CONF1_ALARM_6_TO_3_MASK, val));

        ams_ps_update_reg(ams, AMS_REG_CONFIG1, AMS_REGCFG1_ALARM_MASK, cfg);

        val = FIELD_GET(AMS_ISR0_ALARM_12_TO_7_MASK, alarm_mask);
        cfg = ~(FIELD_PREP(AMS_CONF1_ALARM_12_TO_7_MASK, val));
        ams_ps_update_reg(ams, AMS_REG_CONFIG3, AMS_REGCFG3_ALARM_MASK, cfg);
}

static void ams_update_pl_alarm(struct ams *ams, unsigned long alarm_mask)
{
        unsigned long pl_alarm_mask;
        u32 cfg;
        u32 val;

        pl_alarm_mask = FIELD_GET(AMS_PL_ALARM_MASK, alarm_mask);

        val = FIELD_GET(AMS_ISR0_ALARM_2_TO_0_MASK, pl_alarm_mask);
        cfg = ~(FIELD_PREP(AMS_CONF1_ALARM_2_TO_0_MASK, val));

        val = FIELD_GET(AMS_ISR0_ALARM_6_TO_3_MASK, pl_alarm_mask);
        cfg &= ~(FIELD_PREP(AMS_CONF1_ALARM_6_TO_3_MASK, val));

        ams_pl_update_reg(ams, AMS_REG_CONFIG1, AMS_REGCFG1_ALARM_MASK, cfg);

        val = FIELD_GET(AMS_ISR0_ALARM_12_TO_7_MASK, pl_alarm_mask);
        cfg = ~(FIELD_PREP(AMS_CONF1_ALARM_12_TO_7_MASK, val));
        ams_pl_update_reg(ams, AMS_REG_CONFIG3, AMS_REGCFG3_ALARM_MASK, cfg);
}

static void ams_update_alarm(struct ams *ams, unsigned long alarm_mask)
{
        unsigned long flags;

        if (ams->ps_base)
                ams_update_ps_alarm(ams, alarm_mask);

        if (ams->pl_base)
                ams_update_pl_alarm(ams, alarm_mask);

        spin_lock_irqsave(&ams->intr_lock, flags);
        ams_update_intrmask(ams, AMS_ISR0_ALARM_MASK, ~alarm_mask);
        spin_unlock_irqrestore(&ams->intr_lock, flags);
}

static void ams_enable_channel_sequence(struct iio_dev *indio_dev)
{
        struct ams *ams = iio_priv(indio_dev);
        unsigned long long scan_mask;
        int i;
        u32 regval;

        /*
         * Enable channel sequence. First 22 bits of scan_mask represent
         * PS channels, and next remaining bits represent PL channels.
         */

        /* Run calibration of PS & PL as part of the sequence */
        scan_mask = BIT(0) | BIT(AMS_PS_SEQ_MAX);
        for (i = 0; i < indio_dev->num_channels; i++) {
                const struct iio_chan_spec *chan = &indio_dev->channels[i];

                if (chan->scan_index < AMS_CTRL_SEQ_BASE)
                        scan_mask |= BIT_ULL(chan->scan_index);
        }

        if (ams->ps_base) {
                /* put sysmon in a soft reset to change the sequence */
                ams_ps_update_reg(ams, AMS_REG_CONFIG1, AMS_CONF1_SEQ_MASK,
                                  AMS_CONF1_SEQ_DEFAULT);

                /* configure basic channels */
                regval = FIELD_GET(AMS_REG_SEQ0_MASK, scan_mask);
                writel(regval, ams->ps_base + AMS_REG_SEQ_CH0);

                regval = FIELD_GET(AMS_REG_SEQ2_MASK, scan_mask);
                writel(regval, ams->ps_base + AMS_REG_SEQ_CH2);

                /* set continuous sequence mode */
                ams_ps_update_reg(ams, AMS_REG_CONFIG1, AMS_CONF1_SEQ_MASK,
                                  AMS_CONF1_SEQ_CONTINUOUS);
        }

        if (ams->pl_base) {
                /* put sysmon in a soft reset to change the sequence */
                ams_pl_update_reg(ams, AMS_REG_CONFIG1, AMS_CONF1_SEQ_MASK,
                                  AMS_CONF1_SEQ_DEFAULT);

                /* configure basic channels */
                scan_mask = FIELD_GET(AMS_PL_SEQ_MASK, scan_mask);

                regval = FIELD_GET(AMS_REG_SEQ0_MASK, scan_mask);
                writel(regval, ams->pl_base + AMS_REG_SEQ_CH0);

                regval = FIELD_GET(AMS_REG_SEQ1_MASK, scan_mask);
                writel(regval, ams->pl_base + AMS_REG_SEQ_CH1);

                regval = FIELD_GET(AMS_REG_SEQ2_MASK, scan_mask);
                writel(regval, ams->pl_base + AMS_REG_SEQ_CH2);

                /* set continuous sequence mode */
                ams_pl_update_reg(ams, AMS_REG_CONFIG1, AMS_CONF1_SEQ_MASK,
                                  AMS_CONF1_SEQ_CONTINUOUS);
        }
}

static int ams_init_device(struct ams *ams)
{
        u32 expect = AMS_PS_CSTS_PS_READY;
        u32 reg, value;
        int ret;

        /* reset AMS */
        if (ams->ps_base) {
                writel(AMS_PS_RESET_VALUE, ams->ps_base + AMS_VP_VN);

                ret = readl_poll_timeout(ams->base + AMS_PS_CSTS, reg, (reg & expect),
                                         AMS_INIT_POLL_TIME_US, AMS_INIT_TIMEOUT_US);
                if (ret)
                        return ret;

                /* put sysmon in a default state */
                ams_ps_update_reg(ams, AMS_REG_CONFIG1, AMS_CONF1_SEQ_MASK,
                                  AMS_CONF1_SEQ_DEFAULT);
        }

        if (ams->pl_base) {
                value = readl(ams->base + AMS_PL_CSTS);
                if (value == 0)
                        return 0;

                writel(AMS_PL_RESET_VALUE, ams->pl_base + AMS_VP_VN);

                /* put sysmon in a default state */
                ams_pl_update_reg(ams, AMS_REG_CONFIG1, AMS_CONF1_SEQ_MASK,
                                  AMS_CONF1_SEQ_DEFAULT);
        }

        ams_disable_all_alarms(ams);

        /* Disable interrupt */
        ams_update_intrmask(ams, AMS_ALARM_MASK, AMS_ALARM_MASK);

        /* Clear any pending interrupt */
        writel(AMS_ISR0_ALARM_MASK, ams->base + AMS_ISR_0);
        writel(AMS_ISR1_ALARM_MASK, ams->base + AMS_ISR_1);

        return 0;
}

static int ams_read_label(struct iio_dev *indio_dev,
                          struct iio_chan_spec const *chan, char *label)
{
        return sysfs_emit(label, "%s\n", chan->datasheet_name);
}

static int ams_enable_single_channel(struct ams *ams, unsigned int offset)
{
        u8 channel_num;

        switch (offset) {
        case AMS_VCC_PSPLL0:
                channel_num = AMS_VCC_PSPLL0_CH;
                break;
        case AMS_VCC_PSPLL3:
                channel_num = AMS_VCC_PSPLL3_CH;
                break;
        case AMS_VCCINT:
                channel_num = AMS_VCCINT_CH;
                break;
        case AMS_VCCBRAM:
                channel_num = AMS_VCCBRAM_CH;
                break;
        case AMS_VCCAUX:
                channel_num = AMS_VCCAUX_CH;
                break;
        case AMS_PSDDRPLL:
                channel_num = AMS_PSDDRPLL_CH;
                break;
        case AMS_PSINTFPDDR:
                channel_num = AMS_PSINTFPDDR_CH;
                break;
        default:
                return -EINVAL;
        }

        /* put sysmon in a soft reset to change the sequence */
        ams_ps_update_reg(ams, AMS_REG_CONFIG1, AMS_CONF1_SEQ_MASK,
                          AMS_CONF1_SEQ_DEFAULT);

        /* write the channel number */
        ams_ps_update_reg(ams, AMS_REG_CONFIG0, AMS_CONF0_CHANNEL_NUM_MASK,
                          channel_num);

        /* set single channel, sequencer off mode */
        ams_ps_update_reg(ams, AMS_REG_CONFIG1, AMS_CONF1_SEQ_MASK,
                          AMS_CONF1_SEQ_SINGLE_CHANNEL);

        return 0;
}

static int ams_read_vcc_reg(struct ams *ams, unsigned int offset, u32 *data)
{
        u32 expect = AMS_ISR1_EOC_MASK;
        u32 reg;
        int ret;

        ret = ams_enable_single_channel(ams, offset);
        if (ret)
                return ret;

        /* clear end-of-conversion flag, wait for next conversion to complete */
        writel(expect, ams->base + AMS_ISR_1);
        ret = readl_poll_timeout(ams->base + AMS_ISR_1, reg, (reg & expect),
                                 AMS_INIT_POLL_TIME_US, AMS_INIT_TIMEOUT_US);
        if (ret)
                return ret;

        *data = readl(ams->base + offset);

        return 0;
}

static int ams_get_ps_scale(int address)
{
        int val;

        switch (address) {
        case AMS_SUPPLY1:
        case AMS_SUPPLY2:
        case AMS_SUPPLY3:
        case AMS_SUPPLY4:
        case AMS_SUPPLY9:
        case AMS_SUPPLY10:
        case AMS_VCCAMS:
                val = AMS_SUPPLY_SCALE_3VOLT_mV;
                break;
        case AMS_SUPPLY5:
        case AMS_SUPPLY6:
        case AMS_SUPPLY7:
        case AMS_SUPPLY8:
                val = AMS_SUPPLY_SCALE_6VOLT_mV;
                break;
        default:
                val = AMS_SUPPLY_SCALE_1VOLT_mV;
                break;
        }

        return val;
}

static int ams_get_pl_scale(struct ams *ams, int address)
{
        int val, regval;

        switch (address) {
        case AMS_SUPPLY1:
        case AMS_SUPPLY2:
        case AMS_SUPPLY3:
        case AMS_SUPPLY4:
        case AMS_SUPPLY5:
        case AMS_SUPPLY6:
        case AMS_VCCAMS:
        case AMS_VREFP:
        case AMS_VREFN:
                val = AMS_SUPPLY_SCALE_3VOLT_mV;
                break;
        case AMS_SUPPLY7:
                regval = readl(ams->pl_base + AMS_REG_CONFIG4);
                if (FIELD_GET(AMS_VUSER0_MASK, regval))
                        val = AMS_SUPPLY_SCALE_6VOLT_mV;
                else
                        val = AMS_SUPPLY_SCALE_3VOLT_mV;
                break;
        case AMS_SUPPLY8:
                regval = readl(ams->pl_base + AMS_REG_CONFIG4);
                if (FIELD_GET(AMS_VUSER1_MASK, regval))
                        val = AMS_SUPPLY_SCALE_6VOLT_mV;
                else
                        val = AMS_SUPPLY_SCALE_3VOLT_mV;
                break;
        case AMS_SUPPLY9:
                regval = readl(ams->pl_base + AMS_REG_CONFIG4);
                if (FIELD_GET(AMS_VUSER2_MASK, regval))
                        val = AMS_SUPPLY_SCALE_6VOLT_mV;
                else
                        val = AMS_SUPPLY_SCALE_3VOLT_mV;
                break;
        case AMS_SUPPLY10:
                regval = readl(ams->pl_base + AMS_REG_CONFIG4);
                if (FIELD_GET(AMS_VUSER3_MASK, regval))
                        val = AMS_SUPPLY_SCALE_6VOLT_mV;
                else
                        val = AMS_SUPPLY_SCALE_3VOLT_mV;
                break;
        case AMS_VP_VN:
        case AMS_REG_VAUX(0) ... AMS_REG_VAUX(15):
                val = AMS_SUPPLY_SCALE_1VOLT_mV;
                break;
        default:
                val = AMS_SUPPLY_SCALE_1VOLT_mV;
                break;
        }

        return val;
}

static int ams_get_ctrl_scale(int address)
{
        int val;

        switch (address) {
        case AMS_VCC_PSPLL0:
        case AMS_VCC_PSPLL3:
        case AMS_VCCINT:
        case AMS_VCCBRAM:
        case AMS_VCCAUX:
        case AMS_PSDDRPLL:
        case AMS_PSINTFPDDR:
                val = AMS_SUPPLY_SCALE_3VOLT_mV;
                break;
        default:
                val = AMS_SUPPLY_SCALE_1VOLT_mV;
                break;
        }

        return val;
}

static int ams_read_raw(struct iio_dev *indio_dev,
                        struct iio_chan_spec const *chan,
                        int *val, int *val2, long mask)
{
        struct ams *ams = iio_priv(indio_dev);
        int ret;

        switch (mask) {
        case IIO_CHAN_INFO_RAW:
                mutex_lock(&ams->lock);
                if (chan->scan_index >= AMS_CTRL_SEQ_BASE) {
                        ret = ams_read_vcc_reg(ams, chan->address, val);
                        if (ret)
                                goto unlock_mutex;
                        ams_enable_channel_sequence(indio_dev);
                } else if (chan->scan_index >= AMS_PS_SEQ_MAX)
                        *val = readl(ams->pl_base + chan->address);
                else
                        *val = readl(ams->ps_base + chan->address);

                ret = IIO_VAL_INT;
unlock_mutex:
                mutex_unlock(&ams->lock);
                return ret;
        case IIO_CHAN_INFO_SCALE:
                switch (chan->type) {
                case IIO_VOLTAGE:
                        if (chan->scan_index < AMS_PS_SEQ_MAX)
                                *val = ams_get_ps_scale(chan->address);
                        else if (chan->scan_index >= AMS_PS_SEQ_MAX &&
                                 chan->scan_index < AMS_CTRL_SEQ_BASE)
                                *val = ams_get_pl_scale(ams, chan->address);
                        else
                                *val = ams_get_ctrl_scale(chan->address);

                        *val2 = AMS_SUPPLY_SCALE_DIV_BIT;
                        return IIO_VAL_FRACTIONAL_LOG2;
                case IIO_TEMP:
                        *val = AMS_TEMP_SCALE;
                        *val2 = AMS_TEMP_SCALE_DIV_BIT;
                        return IIO_VAL_FRACTIONAL_LOG2;
                default:
                        return -EINVAL;
                }
        case IIO_CHAN_INFO_OFFSET:
                /* Only the temperature channel has an offset */
                *val = AMS_TEMP_OFFSET;
                return IIO_VAL_INT;
        default:
                return -EINVAL;
        }
}

static int ams_get_alarm_offset(int scan_index, enum iio_event_direction dir)
{
        int offset;

        if (scan_index >= AMS_PS_SEQ_MAX)
                scan_index -= AMS_PS_SEQ_MAX;

        if (dir == IIO_EV_DIR_FALLING) {
                if (scan_index < AMS_SEQ_SUPPLY7)
                        offset = AMS_ALARM_THRESHOLD_OFF_10;
                else
                        offset = AMS_ALARM_THRESHOLD_OFF_20;
        } else {
                offset = 0;
        }

        switch (scan_index) {
        case AMS_SEQ_TEMP:
                return AMS_ALARM_TEMP + offset;
        case AMS_SEQ_SUPPLY1:
                return AMS_ALARM_SUPPLY1 + offset;
        case AMS_SEQ_SUPPLY2:
                return AMS_ALARM_SUPPLY2 + offset;
        case AMS_SEQ_SUPPLY3:
                return AMS_ALARM_SUPPLY3 + offset;
        case AMS_SEQ_SUPPLY4:
                return AMS_ALARM_SUPPLY4 + offset;
        case AMS_SEQ_SUPPLY5:
                return AMS_ALARM_SUPPLY5 + offset;
        case AMS_SEQ_SUPPLY6:
                return AMS_ALARM_SUPPLY6 + offset;
        case AMS_SEQ_SUPPLY7:
                return AMS_ALARM_SUPPLY7 + offset;
        case AMS_SEQ_SUPPLY8:
                return AMS_ALARM_SUPPLY8 + offset;
        case AMS_SEQ_SUPPLY9:
                return AMS_ALARM_SUPPLY9 + offset;
        case AMS_SEQ_SUPPLY10:
                return AMS_ALARM_SUPPLY10 + offset;
        case AMS_SEQ_VCCAMS:
                return AMS_ALARM_VCCAMS + offset;
        case AMS_SEQ_TEMP_REMOTE:
                return AMS_ALARM_TEMP_REMOTE + offset;
        default:
                return 0;
        }
}

static const struct iio_chan_spec *ams_event_to_channel(struct iio_dev *dev,
                                                        u32 event)
{
        int scan_index = 0, i;

        if (event >= AMS_PL_ALARM_START) {
                event -= AMS_PL_ALARM_START;
                scan_index = AMS_PS_SEQ_MAX;
        }

        switch (event) {
        case AMS_ALARM_BIT_TEMP:
                scan_index += AMS_SEQ_TEMP;
                break;
        case AMS_ALARM_BIT_SUPPLY1:
                scan_index += AMS_SEQ_SUPPLY1;
                break;
        case AMS_ALARM_BIT_SUPPLY2:
                scan_index += AMS_SEQ_SUPPLY2;
                break;
        case AMS_ALARM_BIT_SUPPLY3:
                scan_index += AMS_SEQ_SUPPLY3;
                break;
        case AMS_ALARM_BIT_SUPPLY4:
                scan_index += AMS_SEQ_SUPPLY4;
                break;
        case AMS_ALARM_BIT_SUPPLY5:
                scan_index += AMS_SEQ_SUPPLY5;
                break;
        case AMS_ALARM_BIT_SUPPLY6:
                scan_index += AMS_SEQ_SUPPLY6;
                break;
        case AMS_ALARM_BIT_SUPPLY7:
                scan_index += AMS_SEQ_SUPPLY7;
                break;
        case AMS_ALARM_BIT_SUPPLY8:
                scan_index += AMS_SEQ_SUPPLY8;
                break;
        case AMS_ALARM_BIT_SUPPLY9:
                scan_index += AMS_SEQ_SUPPLY9;
                break;
        case AMS_ALARM_BIT_SUPPLY10:
                scan_index += AMS_SEQ_SUPPLY10;
                break;
        case AMS_ALARM_BIT_VCCAMS:
                scan_index += AMS_SEQ_VCCAMS;
                break;
        case AMS_ALARM_BIT_TEMP_REMOTE:
                scan_index += AMS_SEQ_TEMP_REMOTE;
                break;
        default:
                break;
        }

        for (i = 0; i < dev->num_channels; i++)
                if (dev->channels[i].scan_index == scan_index)
                        break;

        return &dev->channels[i];
}

static int ams_get_alarm_mask(int scan_index)
{
        int bit = 0;

        if (scan_index >= AMS_PS_SEQ_MAX) {
                bit = AMS_PL_ALARM_START;
                scan_index -= AMS_PS_SEQ_MAX;
        }

        switch (scan_index) {
        case AMS_SEQ_TEMP:
                return BIT(AMS_ALARM_BIT_TEMP + bit);
        case AMS_SEQ_SUPPLY1:
                return BIT(AMS_ALARM_BIT_SUPPLY1 + bit);
        case AMS_SEQ_SUPPLY2:
                return BIT(AMS_ALARM_BIT_SUPPLY2 + bit);
        case AMS_SEQ_SUPPLY3:
                return BIT(AMS_ALARM_BIT_SUPPLY3 + bit);
        case AMS_SEQ_SUPPLY4:
                return BIT(AMS_ALARM_BIT_SUPPLY4 + bit);
        case AMS_SEQ_SUPPLY5:
                return BIT(AMS_ALARM_BIT_SUPPLY5 + bit);
        case AMS_SEQ_SUPPLY6:
                return BIT(AMS_ALARM_BIT_SUPPLY6 + bit);
        case AMS_SEQ_SUPPLY7:
                return BIT(AMS_ALARM_BIT_SUPPLY7 + bit);
        case AMS_SEQ_SUPPLY8:
                return BIT(AMS_ALARM_BIT_SUPPLY8 + bit);
        case AMS_SEQ_SUPPLY9:
                return BIT(AMS_ALARM_BIT_SUPPLY9 + bit);
        case AMS_SEQ_SUPPLY10:
                return BIT(AMS_ALARM_BIT_SUPPLY10 + bit);
        case AMS_SEQ_VCCAMS:
                return BIT(AMS_ALARM_BIT_VCCAMS + bit);
        case AMS_SEQ_TEMP_REMOTE:
                return BIT(AMS_ALARM_BIT_TEMP_REMOTE + bit);
        default:
                return 0;
        }
}

static int ams_read_event_config(struct iio_dev *indio_dev,
                                 const struct iio_chan_spec *chan,
                                 enum iio_event_type type,
                                 enum iio_event_direction dir)
{
        struct ams *ams = iio_priv(indio_dev);

        return !!(ams->alarm_mask & ams_get_alarm_mask(chan->scan_index));
}

static int ams_write_event_config(struct iio_dev *indio_dev,
                                  const struct iio_chan_spec *chan,
                                  enum iio_event_type type,
                                  enum iio_event_direction dir,
                                  bool state)
{
        struct ams *ams = iio_priv(indio_dev);
        unsigned int alarm;

        alarm = ams_get_alarm_mask(chan->scan_index);

        mutex_lock(&ams->lock);

        if (state)
                ams->alarm_mask |= alarm;
        else
                ams->alarm_mask &= ~alarm;

        ams_update_alarm(ams, ams->alarm_mask);

        mutex_unlock(&ams->lock);

        return 0;
}

static int ams_read_event_value(struct iio_dev *indio_dev,
                                const struct iio_chan_spec *chan,
                                enum iio_event_type type,
                                enum iio_event_direction dir,
                                enum iio_event_info info, int *val, int *val2)
{
        struct ams *ams = iio_priv(indio_dev);
        unsigned int offset = ams_get_alarm_offset(chan->scan_index, dir);

        mutex_lock(&ams->lock);

        if (chan->scan_index >= AMS_PS_SEQ_MAX)
                *val = readl(ams->pl_base + offset);
        else
                *val = readl(ams->ps_base + offset);

        mutex_unlock(&ams->lock);

        return IIO_VAL_INT;
}

static int ams_write_event_value(struct iio_dev *indio_dev,
                                 const struct iio_chan_spec *chan,
                                 enum iio_event_type type,
                                 enum iio_event_direction dir,
                                 enum iio_event_info info, int val, int val2)
{
        struct ams *ams = iio_priv(indio_dev);
        unsigned int offset;

        mutex_lock(&ams->lock);

        /* Set temperature channel threshold to direct threshold */
        if (chan->type == IIO_TEMP) {
                offset = ams_get_alarm_offset(chan->scan_index, IIO_EV_DIR_FALLING);

                if (chan->scan_index >= AMS_PS_SEQ_MAX)
                        ams_pl_update_reg(ams, offset,
                                          AMS_ALARM_THR_DIRECT_MASK,
                                          AMS_ALARM_THR_DIRECT_MASK);
                else
                        ams_ps_update_reg(ams, offset,
                                          AMS_ALARM_THR_DIRECT_MASK,
                                          AMS_ALARM_THR_DIRECT_MASK);
        }

        offset = ams_get_alarm_offset(chan->scan_index, dir);
        if (chan->scan_index >= AMS_PS_SEQ_MAX)
                writel(val, ams->pl_base + offset);
        else
                writel(val, ams->ps_base + offset);

        mutex_unlock(&ams->lock);

        return 0;
}

static void ams_handle_event(struct iio_dev *indio_dev, u32 event)
{
        const struct iio_chan_spec *chan;

        chan = ams_event_to_channel(indio_dev, event);

        if (chan->type == IIO_TEMP) {
                /*
                 * The temperature channel only supports over-temperature
                 * events.
                 */
                iio_push_event(indio_dev,
                               IIO_UNMOD_EVENT_CODE(chan->type, chan->channel,
                                                    IIO_EV_TYPE_THRESH,
                                                    IIO_EV_DIR_RISING),
                               iio_get_time_ns(indio_dev));
        } else {
                /*
                 * For other channels we don't know whether it is a upper or
                 * lower threshold event. Userspace will have to check the
                 * channel value if it wants to know.
                 */
                iio_push_event(indio_dev,
                               IIO_UNMOD_EVENT_CODE(chan->type, chan->channel,
                                                    IIO_EV_TYPE_THRESH,
                                                    IIO_EV_DIR_EITHER),
                               iio_get_time_ns(indio_dev));
        }
}

static void ams_handle_events(struct iio_dev *indio_dev, unsigned long events)
{
        unsigned int bit;

        for_each_set_bit(bit, &events, AMS_NO_OF_ALARMS)
                ams_handle_event(indio_dev, bit);
}

/**
 * ams_unmask_worker - ams alarm interrupt unmask worker
 * @work: work to be done
 *
 * The ZynqMP threshold interrupts are level sensitive. Since we can't make the
 * threshold condition go way from within the interrupt handler, this means as
 * soon as a threshold condition is present we would enter the interrupt handler
 * again and again. To work around this we mask all active threshold interrupts
 * in the interrupt handler and start a timer. In this timer we poll the
 * interrupt status and only if the interrupt is inactive we unmask it again.
 */
static void ams_unmask_worker(struct work_struct *work)
{
        struct ams *ams = container_of(work, struct ams, ams_unmask_work.work);
        unsigned int status, unmask;

        spin_lock_irq(&ams->intr_lock);

        status = readl(ams->base + AMS_ISR_0);

        /* Clear those bits which are not active anymore */
        unmask = (ams->current_masked_alarm ^ status) & ams->current_masked_alarm;

        /* Clear status of disabled alarm */
        unmask |= ams->intr_mask;

        ams->current_masked_alarm &= status;

        /* Also clear those which are masked out anyway */
        ams->current_masked_alarm &= ~ams->intr_mask;

        /* Clear the interrupts before we unmask them */
        writel(unmask, ams->base + AMS_ISR_0);

        ams_update_intrmask(ams, ~AMS_ALARM_MASK, ~AMS_ALARM_MASK);

        spin_unlock_irq(&ams->intr_lock);

        /* If still pending some alarm re-trigger the timer */
        if (ams->current_masked_alarm)
                schedule_delayed_work(&ams->ams_unmask_work,
                                      msecs_to_jiffies(AMS_UNMASK_TIMEOUT_MS));
}

static irqreturn_t ams_irq(int irq, void *data)
{
        struct iio_dev *indio_dev = data;
        struct ams *ams = iio_priv(indio_dev);
        u32 isr0;

        spin_lock(&ams->intr_lock);

        isr0 = readl(ams->base + AMS_ISR_0);

        /* Only process alarms that are not masked */
        isr0 &= ~((ams->intr_mask & AMS_ISR0_ALARM_MASK) | ams->current_masked_alarm);
        if (!isr0) {
                spin_unlock(&ams->intr_lock);
                return IRQ_NONE;
        }

        /* Clear interrupt */
        writel(isr0, ams->base + AMS_ISR_0);

        /* Mask the alarm interrupts until cleared */
        ams->current_masked_alarm |= isr0;
        ams_update_intrmask(ams, ~AMS_ALARM_MASK, ~AMS_ALARM_MASK);

        ams_handle_events(indio_dev, isr0);

        schedule_delayed_work(&ams->ams_unmask_work,
                              msecs_to_jiffies(AMS_UNMASK_TIMEOUT_MS));

        spin_unlock(&ams->intr_lock);

        return IRQ_HANDLED;
}

static const struct iio_event_spec ams_temp_events[] = {
        {
                .type = IIO_EV_TYPE_THRESH,
                .dir = IIO_EV_DIR_RISING,
                .mask_separate = BIT(IIO_EV_INFO_ENABLE) | BIT(IIO_EV_INFO_VALUE),
        },
};

static const struct iio_event_spec ams_voltage_events[] = {
        {
                .type = IIO_EV_TYPE_THRESH,
                .dir = IIO_EV_DIR_RISING,
                .mask_separate = BIT(IIO_EV_INFO_VALUE),
        },
        {
                .type = IIO_EV_TYPE_THRESH,
                .dir = IIO_EV_DIR_FALLING,
                .mask_separate = BIT(IIO_EV_INFO_VALUE),
        },
        {
                .type = IIO_EV_TYPE_THRESH,
                .dir = IIO_EV_DIR_EITHER,
                .mask_separate = BIT(IIO_EV_INFO_ENABLE),
        },
};

static const struct iio_chan_spec ams_ps_channels[] = {
        AMS_PS_CHAN_TEMP(AMS_SEQ_TEMP, AMS_TEMP, "Temp_LPD"),
        AMS_PS_CHAN_TEMP(AMS_SEQ_TEMP_REMOTE, AMS_TEMP_REMOTE, "Temp_FPD"),
        AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY1, AMS_SUPPLY1, "VCC_PSINTLP"),
        AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY2, AMS_SUPPLY2, "VCC_PSINTFP"),
        AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY3, AMS_SUPPLY3, "VCC_PSAUX"),
        AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY4, AMS_SUPPLY4, "VCC_PSDDR"),
        AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY5, AMS_SUPPLY5, "VCC_PSIO3"),
        AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY6, AMS_SUPPLY6, "VCC_PSIO0"),
        AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY7, AMS_SUPPLY7, "VCC_PSIO1"),
        AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY8, AMS_SUPPLY8, "VCC_PSIO2"),
        AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY9, AMS_SUPPLY9, "PS_MGTRAVCC"),
        AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY10, AMS_SUPPLY10, "PS_MGTRAVTT"),
        AMS_PS_CHAN_VOLTAGE(AMS_SEQ_VCCAMS, AMS_VCCAMS, "VCC_PSADC"),
};

static const struct iio_chan_spec ams_pl_channels[] = {
        AMS_PL_CHAN_TEMP(AMS_SEQ_TEMP, AMS_TEMP, "Temp_PL"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY1, AMS_SUPPLY1, true, "VCCINT"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY2, AMS_SUPPLY2, true, "VCCAUX"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_VREFP, AMS_VREFP, false, "VREFP"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_VREFN, AMS_VREFN, false, "VREFN"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY3, AMS_SUPPLY3, true, "VCCBRAM"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY4, AMS_SUPPLY4, true, "VCC_PSINTLP"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY5, AMS_SUPPLY5, true, "VCC_PSINTFP"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY6, AMS_SUPPLY6, true, "VCC_PSAUX"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_VCCAMS, AMS_VCCAMS, true, "VCCAMS"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_VP_VN, AMS_VP_VN, false, "VP_VN"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY7, AMS_SUPPLY7, true, "VUser0"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY8, AMS_SUPPLY8, true, "VUser1"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY9, AMS_SUPPLY9, true, "VUser2"),
        AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY10, AMS_SUPPLY10, true, "VUser3"),
        AMS_PL_AUX_CHAN_VOLTAGE(0),
        AMS_PL_AUX_CHAN_VOLTAGE(1),
        AMS_PL_AUX_CHAN_VOLTAGE(2),
        AMS_PL_AUX_CHAN_VOLTAGE(3),
        AMS_PL_AUX_CHAN_VOLTAGE(4),
        AMS_PL_AUX_CHAN_VOLTAGE(5),
        AMS_PL_AUX_CHAN_VOLTAGE(6),
        AMS_PL_AUX_CHAN_VOLTAGE(7),
        AMS_PL_AUX_CHAN_VOLTAGE(8),
        AMS_PL_AUX_CHAN_VOLTAGE(9),
        AMS_PL_AUX_CHAN_VOLTAGE(10),
        AMS_PL_AUX_CHAN_VOLTAGE(11),
        AMS_PL_AUX_CHAN_VOLTAGE(12),
        AMS_PL_AUX_CHAN_VOLTAGE(13),
        AMS_PL_AUX_CHAN_VOLTAGE(14),
        AMS_PL_AUX_CHAN_VOLTAGE(15),
};

static const struct iio_chan_spec ams_ctrl_channels[] = {
        AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCC_PSPLL, AMS_VCC_PSPLL0, "VCC_PSPLL"),
        AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCC_PSBATT, AMS_VCC_PSPLL3, "VCC_PSBATT"),
        AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCCINT, AMS_VCCINT, "VCCINT"),
        AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCCBRAM, AMS_VCCBRAM, "VCCBRAM"),
        AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCCAUX, AMS_VCCAUX, "VCCAUX"),
        AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_PSDDRPLL, AMS_PSDDRPLL, "VCC_PSDDR_PLL"),
        AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_INTDDR, AMS_PSINTFPDDR, "VCC_PSINTFP_DDR"),
};

static int ams_get_ext_chan(struct fwnode_handle *chan_node,
                            struct iio_chan_spec *channels, int num_channels)
{
        struct iio_chan_spec *chan;
        struct fwnode_handle *child;
        unsigned int reg, ext_chan;
        int ret;

        fwnode_for_each_child_node(chan_node, child) {
                ret = fwnode_property_read_u32(child, "reg", &reg);
                if (ret || reg > AMS_PL_MAX_EXT_CHANNEL + 30)
                        continue;

                chan = &channels[num_channels];
                ext_chan = reg + AMS_PL_MAX_FIXED_CHANNEL - 30;
                memcpy(chan, &ams_pl_channels[ext_chan], sizeof(*channels));

                if (fwnode_property_read_bool(child, "xlnx,bipolar"))
                        chan->scan_type.sign = 's';

                num_channels++;
        }

        return num_channels;
}

static void ams_iounmap_ps(void *data)
{
        struct ams *ams = data;

        iounmap(ams->ps_base);
}

static void ams_iounmap_pl(void *data)
{
        struct ams *ams = data;

        iounmap(ams->pl_base);
}

static int ams_init_module(struct iio_dev *indio_dev,
                           struct fwnode_handle *fwnode,
                           struct iio_chan_spec *channels)
{
        struct device *dev = indio_dev->dev.parent;
        struct ams *ams = iio_priv(indio_dev);
        int num_channels = 0;
        int ret;

        if (fwnode_device_is_compatible(fwnode, "xlnx,zynqmp-ams-ps")) {
                ams->ps_base = fwnode_iomap(fwnode, 0);
                if (!ams->ps_base)
                        return -ENXIO;
                ret = devm_add_action_or_reset(dev, ams_iounmap_ps, ams);
                if (ret < 0)
                        return ret;

                /* add PS channels to iio device channels */
                memcpy(channels, ams_ps_channels, sizeof(ams_ps_channels));
                num_channels = ARRAY_SIZE(ams_ps_channels);
        } else if (fwnode_device_is_compatible(fwnode, "xlnx,zynqmp-ams-pl")) {
                ams->pl_base = fwnode_iomap(fwnode, 0);
                if (!ams->pl_base)
                        return -ENXIO;

                ret = devm_add_action_or_reset(dev, ams_iounmap_pl, ams);
                if (ret < 0)
                        return ret;

                /* Copy only first 10 fix channels */
                memcpy(channels, ams_pl_channels, AMS_PL_MAX_FIXED_CHANNEL * sizeof(*channels));
                num_channels += AMS_PL_MAX_FIXED_CHANNEL;
                num_channels = ams_get_ext_chan(fwnode, channels,
                                                num_channels);
        } else if (fwnode_device_is_compatible(fwnode, "xlnx,zynqmp-ams")) {
                /* add AMS channels to iio device channels */
                memcpy(channels, ams_ctrl_channels, sizeof(ams_ctrl_channels));
                num_channels += ARRAY_SIZE(ams_ctrl_channels);
        } else {
                return -EINVAL;
        }

        return num_channels;
}

static int ams_parse_firmware(struct iio_dev *indio_dev)
{
        struct ams *ams = iio_priv(indio_dev);
        struct iio_chan_spec *ams_channels, *dev_channels;
        struct device *dev = indio_dev->dev.parent;
        struct fwnode_handle *fwnode = dev_fwnode(dev);
        size_t ams_size;
        int ret, ch_cnt = 0, i, rising_off, falling_off;
        unsigned int num_channels = 0;

        ams_size = ARRAY_SIZE(ams_ps_channels) + ARRAY_SIZE(ams_pl_channels) +
                ARRAY_SIZE(ams_ctrl_channels);

        /* Initialize buffer for channel specification */
        ams_channels = devm_kcalloc(dev, ams_size, sizeof(*ams_channels), GFP_KERNEL);
        if (!ams_channels)
                return -ENOMEM;

        if (fwnode_device_is_available(fwnode)) {
                ret = ams_init_module(indio_dev, fwnode, ams_channels);
                if (ret < 0)
                        return ret;

                num_channels += ret;
        }

        device_for_each_child_node_scoped(dev, child) {
                ret = ams_init_module(indio_dev, child, ams_channels + num_channels);
                if (ret < 0)
                        return ret;

                num_channels += ret;
        }

        for (i = 0; i < num_channels; i++) {
                ams_channels[i].channel = ch_cnt++;

                if (ams_channels[i].scan_index < AMS_CTRL_SEQ_BASE) {
                        /* set threshold to max and min for each channel */
                        falling_off =
                                ams_get_alarm_offset(ams_channels[i].scan_index,
                                                     IIO_EV_DIR_FALLING);
                        rising_off =
                                ams_get_alarm_offset(ams_channels[i].scan_index,
                                                     IIO_EV_DIR_RISING);
                        if (ams_channels[i].scan_index >= AMS_PS_SEQ_MAX) {
                                writel(AMS_ALARM_THR_MIN,
                                       ams->pl_base + falling_off);
                                writel(AMS_ALARM_THR_MAX,
                                       ams->pl_base + rising_off);
                        } else {
                                writel(AMS_ALARM_THR_MIN,
                                       ams->ps_base + falling_off);
                                writel(AMS_ALARM_THR_MAX,
                                       ams->ps_base + rising_off);
                        }
                }
        }

        dev_channels = devm_krealloc_array(dev, ams_channels, num_channels,
                                           sizeof(*dev_channels), GFP_KERNEL);
        if (!dev_channels)
                return -ENOMEM;

        indio_dev->channels = dev_channels;
        indio_dev->num_channels = num_channels;

        return 0;
}

static const struct iio_info iio_ams_info = {
        .read_label = ams_read_label,
        .read_raw = &ams_read_raw,
        .read_event_config = &ams_read_event_config,
        .write_event_config = &ams_write_event_config,
        .read_event_value = &ams_read_event_value,
        .write_event_value = &ams_write_event_value,
};

static const struct of_device_id ams_of_match_table[] = {
        { .compatible = "xlnx,zynqmp-ams" },
        { }
};
MODULE_DEVICE_TABLE(of, ams_of_match_table);

static int ams_probe(struct platform_device *pdev)
{
        struct iio_dev *indio_dev;
        struct ams *ams;
        int ret;
        int irq;

        indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*ams));
        if (!indio_dev)
                return -ENOMEM;

        ams = iio_priv(indio_dev);
        mutex_init(&ams->lock);
        spin_lock_init(&ams->intr_lock);

        indio_dev->name = "xilinx-ams";

        indio_dev->info = &iio_ams_info;
        indio_dev->modes = INDIO_DIRECT_MODE;

        ams->base = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(ams->base))
                return PTR_ERR(ams->base);

        ams->clk = devm_clk_get_enabled(&pdev->dev, NULL);
        if (IS_ERR(ams->clk))
                return PTR_ERR(ams->clk);

        ret = devm_delayed_work_autocancel(&pdev->dev, &ams->ams_unmask_work,
                                           ams_unmask_worker);
        if (ret < 0)
                return ret;

        ret = ams_parse_firmware(indio_dev);
        if (ret)
                return dev_err_probe(&pdev->dev, ret, "failure in parsing DT\n");

        ret = ams_init_device(ams);
        if (ret)
                return dev_err_probe(&pdev->dev, ret, "failed to initialize AMS\n");

        ams_enable_channel_sequence(indio_dev);

        irq = platform_get_irq(pdev, 0);
        if (irq < 0)
                return irq;

        ret = devm_request_irq(&pdev->dev, irq, &ams_irq, 0, "ams-irq",
                               indio_dev);
        if (ret < 0)
                return dev_err_probe(&pdev->dev, ret, "failed to register interrupt\n");

        platform_set_drvdata(pdev, indio_dev);

        return devm_iio_device_register(&pdev->dev, indio_dev);
}

static int ams_suspend(struct device *dev)
{
        struct ams *ams = iio_priv(dev_get_drvdata(dev));

        clk_disable_unprepare(ams->clk);

        return 0;
}

static int ams_resume(struct device *dev)
{
        struct ams *ams = iio_priv(dev_get_drvdata(dev));

        return clk_prepare_enable(ams->clk);
}

static DEFINE_SIMPLE_DEV_PM_OPS(ams_pm_ops, ams_suspend, ams_resume);

static struct platform_driver ams_driver = {
        .probe = ams_probe,
        .driver = {
                .name = "xilinx-ams",
                .pm = pm_sleep_ptr(&ams_pm_ops),
                .of_match_table = ams_of_match_table,
        },
};
module_platform_driver(ams_driver);

MODULE_DESCRIPTION("Xilinx AMS driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Xilinx, Inc.");