// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
// Copyright(c) 2015-17 Intel Corporation.

/*
 * Soundwire Intel Master Driver
 */

#include <linux/acpi.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/auxiliary_bus.h>
#include <sound/pcm_params.h>
#include <linux/pm_runtime.h>
#include <sound/soc.h>
#include <linux/soundwire/sdw_registers.h>
#include <linux/soundwire/sdw.h>
#include <linux/soundwire/sdw_intel.h>
#include "cadence_master.h"
#include "bus.h"
#include "intel.h"

#define INTEL_MASTER_SUSPEND_DELAY_MS   3000
#define INTEL_MASTER_RESET_ITERATIONS   10

/*
 * debug/config flags for the Intel SoundWire Master.
 *
 * Since we may have multiple masters active, we can have up to 8
 * flags reused in each byte, with master0 using the ls-byte, etc.
 */

#define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME             BIT(0)
#define SDW_INTEL_MASTER_DISABLE_CLOCK_STOP             BIT(1)
#define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE        BIT(2)
#define SDW_INTEL_MASTER_DISABLE_MULTI_LINK             BIT(3)

static int md_flags;
module_param_named(sdw_md_flags, md_flags, int, 0444);
MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off)");

enum intel_pdi_type {
        INTEL_PDI_IN = 0,
        INTEL_PDI_OUT = 1,
        INTEL_PDI_BD = 2,
};

#define cdns_to_intel(_cdns) container_of(_cdns, struct sdw_intel, cdns)

/*
 * Read, write helpers for HW registers
 */
static inline int intel_readl(void __iomem *base, int offset)
{
        return readl(base + offset);
}

static inline void intel_writel(void __iomem *base, int offset, int value)
{
        writel(value, base + offset);
}

static inline u16 intel_readw(void __iomem *base, int offset)
{
        return readw(base + offset);
}

static inline void intel_writew(void __iomem *base, int offset, u16 value)
{
        writew(value, base + offset);
}

static int intel_wait_bit(void __iomem *base, int offset, u32 mask, u32 target)
{
        int timeout = 10;
        u32 reg_read;

        do {
                reg_read = readl(base + offset);
                if ((reg_read & mask) == target)
                        return 0;

                timeout--;
                usleep_range(50, 100);
        } while (timeout != 0);

        return -EAGAIN;
}

static int intel_clear_bit(void __iomem *base, int offset, u32 value, u32 mask)
{
        writel(value, base + offset);
        return intel_wait_bit(base, offset, mask, 0);
}

static int intel_set_bit(void __iomem *base, int offset, u32 value, u32 mask)
{
        writel(value, base + offset);
        return intel_wait_bit(base, offset, mask, mask);
}

/*
 * debugfs
 */
#ifdef CONFIG_DEBUG_FS

#define RD_BUF (2 * PAGE_SIZE)

static ssize_t intel_sprintf(void __iomem *mem, bool l,
                             char *buf, size_t pos, unsigned int reg)
{
        int value;

        if (l)
                value = intel_readl(mem, reg);
        else
                value = intel_readw(mem, reg);

        return scnprintf(buf + pos, RD_BUF - pos, "%4x\t%4x\n", reg, value);
}

static int intel_reg_show(struct seq_file *s_file, void *data)
{
        struct sdw_intel *sdw = s_file->private;
        void __iomem *s = sdw->link_res->shim;
        void __iomem *a = sdw->link_res->alh;
        char *buf;
        ssize_t ret;
        int i, j;
        unsigned int links, reg;

        buf = kzalloc(RD_BUF, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        links = intel_readl(s, SDW_SHIM_LCAP) & GENMASK(2, 0);

        ret = scnprintf(buf, RD_BUF, "Register  Value\n");
        ret += scnprintf(buf + ret, RD_BUF - ret, "\nShim\n");

        for (i = 0; i < links; i++) {
                reg = SDW_SHIM_LCAP + i * 4;
                ret += intel_sprintf(s, true, buf, ret, reg);
        }

        for (i = 0; i < links; i++) {
                ret += scnprintf(buf + ret, RD_BUF - ret, "\nLink%d\n", i);
                ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLSCAP(i));
                ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLS0CM(i));
                ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLS1CM(i));
                ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLS2CM(i));
                ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLS3CM(i));
                ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_PCMSCAP(i));

                ret += scnprintf(buf + ret, RD_BUF - ret, "\n PCMSyCH registers\n");

                /*
                 * the value 10 is the number of PDIs. We will need a
                 * cleanup to remove hard-coded Intel configurations
                 * from cadence_master.c
                 */
                for (j = 0; j < 10; j++) {
                        ret += intel_sprintf(s, false, buf, ret,
                                        SDW_SHIM_PCMSYCHM(i, j));
                        ret += intel_sprintf(s, false, buf, ret,
                                        SDW_SHIM_PCMSYCHC(i, j));
                }
                ret += scnprintf(buf + ret, RD_BUF - ret, "\n PDMSCAP, IOCTL, CTMCTL\n");

                ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_PDMSCAP(i));
                ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_IOCTL(i));
                ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTMCTL(i));
        }

        ret += scnprintf(buf + ret, RD_BUF - ret, "\nWake registers\n");
        ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_WAKEEN);
        ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_WAKESTS);

        ret += scnprintf(buf + ret, RD_BUF - ret, "\nALH STRMzCFG\n");
        for (i = 0; i < SDW_ALH_NUM_STREAMS; i++)
                ret += intel_sprintf(a, true, buf, ret, SDW_ALH_STRMZCFG(i));

        seq_printf(s_file, "%s", buf);
        kfree(buf);

        return 0;
}
DEFINE_SHOW_ATTRIBUTE(intel_reg);

static int intel_set_m_datamode(void *data, u64 value)
{
        struct sdw_intel *sdw = data;
        struct sdw_bus *bus = &sdw->cdns.bus;

        if (value > SDW_PORT_DATA_MODE_STATIC_1)
                return -EINVAL;

        /* Userspace changed the hardware state behind the kernel's back */
        add_taint(TAINT_USER, LOCKDEP_STILL_OK);

        bus->params.m_data_mode = value;

        return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(intel_set_m_datamode_fops, NULL,
                         intel_set_m_datamode, "%llu\n");

static int intel_set_s_datamode(void *data, u64 value)
{
        struct sdw_intel *sdw = data;
        struct sdw_bus *bus = &sdw->cdns.bus;

        if (value > SDW_PORT_DATA_MODE_STATIC_1)
                return -EINVAL;

        /* Userspace changed the hardware state behind the kernel's back */
        add_taint(TAINT_USER, LOCKDEP_STILL_OK);

        bus->params.s_data_mode = value;

        return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(intel_set_s_datamode_fops, NULL,
                         intel_set_s_datamode, "%llu\n");

static void intel_debugfs_init(struct sdw_intel *sdw)
{
        struct dentry *root = sdw->cdns.bus.debugfs;

        if (!root)
                return;

        sdw->debugfs = debugfs_create_dir("intel-sdw", root);

        debugfs_create_file("intel-registers", 0400, sdw->debugfs, sdw,
                            &intel_reg_fops);

        debugfs_create_file("intel-m-datamode", 0200, sdw->debugfs, sdw,
                            &intel_set_m_datamode_fops);

        debugfs_create_file("intel-s-datamode", 0200, sdw->debugfs, sdw,
                            &intel_set_s_datamode_fops);

        sdw_cdns_debugfs_init(&sdw->cdns, sdw->debugfs);
}

static void intel_debugfs_exit(struct sdw_intel *sdw)
{
        debugfs_remove_recursive(sdw->debugfs);
}
#else
static void intel_debugfs_init(struct sdw_intel *sdw) {}
static void intel_debugfs_exit(struct sdw_intel *sdw) {}
#endif /* CONFIG_DEBUG_FS */

/*
 * shim ops
 */

static int intel_link_power_up(struct sdw_intel *sdw)
{
        unsigned int link_id = sdw->instance;
        void __iomem *shim = sdw->link_res->shim;
        u32 *shim_mask = sdw->link_res->shim_mask;
        struct sdw_bus *bus = &sdw->cdns.bus;
        struct sdw_master_prop *prop = &bus->prop;
        u32 spa_mask, cpa_mask;
        u32 link_control;
        int ret = 0;
        u32 syncprd;
        u32 sync_reg;

        mutex_lock(sdw->link_res->shim_lock);

        /*
         * The hardware relies on an internal counter, typically 4kHz,
         * to generate the SoundWire SSP - which defines a 'safe'
         * synchronization point between commands and audio transport
         * and allows for multi link synchronization. The SYNCPRD value
         * is only dependent on the oscillator clock provided to
         * the IP, so adjust based on _DSD properties reported in DSDT
         * tables. The values reported are based on either 24MHz
         * (CNL/CML) or 38.4 MHz (ICL/TGL+).
         */
        if (prop->mclk_freq % 6000000)
                syncprd = SDW_SHIM_SYNC_SYNCPRD_VAL_38_4;
        else
                syncprd = SDW_SHIM_SYNC_SYNCPRD_VAL_24;

        if (!*shim_mask) {
                dev_dbg(sdw->cdns.dev, "%s: powering up all links\n", __func__);

                /* we first need to program the SyncPRD/CPU registers */
                dev_dbg(sdw->cdns.dev,
                        "%s: first link up, programming SYNCPRD\n", __func__);

                /* set SyncPRD period */
                sync_reg = intel_readl(shim, SDW_SHIM_SYNC);
                u32p_replace_bits(&sync_reg, syncprd, SDW_SHIM_SYNC_SYNCPRD);

                /* Set SyncCPU bit */
                sync_reg |= SDW_SHIM_SYNC_SYNCCPU;
                intel_writel(shim, SDW_SHIM_SYNC, sync_reg);

                /* Link power up sequence */
                link_control = intel_readl(shim, SDW_SHIM_LCTL);

                /* only power-up enabled links */
                spa_mask = FIELD_PREP(SDW_SHIM_LCTL_SPA_MASK, sdw->link_res->link_mask);
                cpa_mask = FIELD_PREP(SDW_SHIM_LCTL_CPA_MASK, sdw->link_res->link_mask);

                link_control |=  spa_mask;

                ret = intel_set_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask);
                if (ret < 0) {
                        dev_err(sdw->cdns.dev, "Failed to power up link: %d\n", ret);
                        goto out;
                }

                /* SyncCPU will change once link is active */
                ret = intel_wait_bit(shim, SDW_SHIM_SYNC,
                                     SDW_SHIM_SYNC_SYNCCPU, 0);
                if (ret < 0) {
                        dev_err(sdw->cdns.dev,
                                "Failed to set SHIM_SYNC: %d\n", ret);
                        goto out;
                }
        }

        *shim_mask |= BIT(link_id);

        sdw->cdns.link_up = true;
out:
        mutex_unlock(sdw->link_res->shim_lock);

        return ret;
}

/* this needs to be called with shim_lock */
static void intel_shim_glue_to_master_ip(struct sdw_intel *sdw)
{
        void __iomem *shim = sdw->link_res->shim;
        unsigned int link_id = sdw->instance;
        u16 ioctl;

        /* Switch to MIP from Glue logic */
        ioctl = intel_readw(shim,  SDW_SHIM_IOCTL(link_id));

        ioctl &= ~(SDW_SHIM_IOCTL_DOE);
        intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
        usleep_range(10, 15);

        ioctl &= ~(SDW_SHIM_IOCTL_DO);
        intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
        usleep_range(10, 15);

        ioctl |= (SDW_SHIM_IOCTL_MIF);
        intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
        usleep_range(10, 15);

        ioctl &= ~(SDW_SHIM_IOCTL_BKE);
        ioctl &= ~(SDW_SHIM_IOCTL_COE);
        intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
        usleep_range(10, 15);

        /* at this point Master IP has full control of the I/Os */
}

/* this needs to be called with shim_lock */
static void intel_shim_master_ip_to_glue(struct sdw_intel *sdw)
{
        unsigned int link_id = sdw->instance;
        void __iomem *shim = sdw->link_res->shim;
        u16 ioctl;

        /* Glue logic */
        ioctl = intel_readw(shim, SDW_SHIM_IOCTL(link_id));
        ioctl |= SDW_SHIM_IOCTL_BKE;
        ioctl |= SDW_SHIM_IOCTL_COE;
        intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
        usleep_range(10, 15);

        ioctl &= ~(SDW_SHIM_IOCTL_MIF);
        intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
        usleep_range(10, 15);

        /* at this point Integration Glue has full control of the I/Os */
}

static int intel_shim_init(struct sdw_intel *sdw, bool clock_stop)
{
        void __iomem *shim = sdw->link_res->shim;
        unsigned int link_id = sdw->instance;
        int ret = 0;
        u16 ioctl = 0, act = 0;

        mutex_lock(sdw->link_res->shim_lock);

        /* Initialize Shim */
        ioctl |= SDW_SHIM_IOCTL_BKE;
        intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
        usleep_range(10, 15);

        ioctl |= SDW_SHIM_IOCTL_WPDD;
        intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
        usleep_range(10, 15);

        ioctl |= SDW_SHIM_IOCTL_DO;
        intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
        usleep_range(10, 15);

        ioctl |= SDW_SHIM_IOCTL_DOE;
        intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
        usleep_range(10, 15);

        intel_shim_glue_to_master_ip(sdw);

        u16p_replace_bits(&act, 0x1, SDW_SHIM_CTMCTL_DOAIS);
        act |= SDW_SHIM_CTMCTL_DACTQE;
        act |= SDW_SHIM_CTMCTL_DODS;
        intel_writew(shim, SDW_SHIM_CTMCTL(link_id), act);
        usleep_range(10, 15);

        mutex_unlock(sdw->link_res->shim_lock);

        return ret;
}

static void intel_shim_wake(struct sdw_intel *sdw, bool wake_enable)
{
        void __iomem *shim = sdw->link_res->shim;
        unsigned int link_id = sdw->instance;
        u16 wake_en, wake_sts;

        mutex_lock(sdw->link_res->shim_lock);
        wake_en = intel_readw(shim, SDW_SHIM_WAKEEN);

        if (wake_enable) {
                /* Enable the wakeup */
                wake_en |= (SDW_SHIM_WAKEEN_ENABLE << link_id);
                intel_writew(shim, SDW_SHIM_WAKEEN, wake_en);
        } else {
                /* Disable the wake up interrupt */
                wake_en &= ~(SDW_SHIM_WAKEEN_ENABLE << link_id);
                intel_writew(shim, SDW_SHIM_WAKEEN, wake_en);

                /* Clear wake status */
                wake_sts = intel_readw(shim, SDW_SHIM_WAKESTS);
                wake_sts |= (SDW_SHIM_WAKEEN_ENABLE << link_id);
                intel_writew(shim, SDW_SHIM_WAKESTS_STATUS, wake_sts);
        }
        mutex_unlock(sdw->link_res->shim_lock);
}

static int intel_link_power_down(struct sdw_intel *sdw)
{
        u32 link_control, spa_mask, cpa_mask;
        unsigned int link_id = sdw->instance;
        void __iomem *shim = sdw->link_res->shim;
        u32 *shim_mask = sdw->link_res->shim_mask;
        int ret = 0;

        mutex_lock(sdw->link_res->shim_lock);

        if (!(*shim_mask & BIT(link_id)))
                dev_err(sdw->cdns.dev,
                        "%s: Unbalanced power-up/down calls\n", __func__);

        sdw->cdns.link_up = false;

        intel_shim_master_ip_to_glue(sdw);

        *shim_mask &= ~BIT(link_id);

        if (!*shim_mask) {

                dev_dbg(sdw->cdns.dev, "%s: powering down all links\n", __func__);

                /* Link power down sequence */
                link_control = intel_readl(shim, SDW_SHIM_LCTL);

                /* only power-down enabled links */
                spa_mask = FIELD_PREP(SDW_SHIM_LCTL_SPA_MASK, ~sdw->link_res->link_mask);
                cpa_mask = FIELD_PREP(SDW_SHIM_LCTL_CPA_MASK, sdw->link_res->link_mask);

                link_control &=  spa_mask;

                ret = intel_clear_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask);
                if (ret < 0) {
                        dev_err(sdw->cdns.dev, "%s: could not power down link\n", __func__);

                        /*
                         * we leave the sdw->cdns.link_up flag as false since we've disabled
                         * the link at this point and cannot handle interrupts any longer.
                         */
                }
        }

        mutex_unlock(sdw->link_res->shim_lock);

        return ret;
}

static void intel_shim_sync_arm(struct sdw_intel *sdw)
{
        void __iomem *shim = sdw->link_res->shim;
        u32 sync_reg;

        mutex_lock(sdw->link_res->shim_lock);

        /* update SYNC register */
        sync_reg = intel_readl(shim, SDW_SHIM_SYNC);
        sync_reg |= (SDW_SHIM_SYNC_CMDSYNC << sdw->instance);
        intel_writel(shim, SDW_SHIM_SYNC, sync_reg);

        mutex_unlock(sdw->link_res->shim_lock);
}

static int intel_shim_sync_go_unlocked(struct sdw_intel *sdw)
{
        void __iomem *shim = sdw->link_res->shim;
        u32 sync_reg;
        int ret;

        /* Read SYNC register */
        sync_reg = intel_readl(shim, SDW_SHIM_SYNC);

        /*
         * Set SyncGO bit to synchronously trigger a bank switch for
         * all the masters. A write to SYNCGO bit clears CMDSYNC bit for all
         * the Masters.
         */
        sync_reg |= SDW_SHIM_SYNC_SYNCGO;

        ret = intel_clear_bit(shim, SDW_SHIM_SYNC, sync_reg,
                              SDW_SHIM_SYNC_SYNCGO);

        if (ret < 0)
                dev_err(sdw->cdns.dev, "SyncGO clear failed: %d\n", ret);

        return ret;
}

static int intel_shim_sync_go(struct sdw_intel *sdw)
{
        int ret;

        mutex_lock(sdw->link_res->shim_lock);

        ret = intel_shim_sync_go_unlocked(sdw);

        mutex_unlock(sdw->link_res->shim_lock);

        return ret;
}

/*
 * PDI routines
 */
static void intel_pdi_init(struct sdw_intel *sdw,
                           struct sdw_cdns_stream_config *config)
{
        void __iomem *shim = sdw->link_res->shim;
        unsigned int link_id = sdw->instance;
        int pcm_cap, pdm_cap;

        /* PCM Stream Capability */
        pcm_cap = intel_readw(shim, SDW_SHIM_PCMSCAP(link_id));

        config->pcm_bd = FIELD_GET(SDW_SHIM_PCMSCAP_BSS, pcm_cap);
        config->pcm_in = FIELD_GET(SDW_SHIM_PCMSCAP_ISS, pcm_cap);
        config->pcm_out = FIELD_GET(SDW_SHIM_PCMSCAP_OSS, pcm_cap);

        dev_dbg(sdw->cdns.dev, "PCM cap bd:%d in:%d out:%d\n",
                config->pcm_bd, config->pcm_in, config->pcm_out);

        /* PDM Stream Capability */
        pdm_cap = intel_readw(shim, SDW_SHIM_PDMSCAP(link_id));

        config->pdm_bd = FIELD_GET(SDW_SHIM_PDMSCAP_BSS, pdm_cap);
        config->pdm_in = FIELD_GET(SDW_SHIM_PDMSCAP_ISS, pdm_cap);
        config->pdm_out = FIELD_GET(SDW_SHIM_PDMSCAP_OSS, pdm_cap);

        dev_dbg(sdw->cdns.dev, "PDM cap bd:%d in:%d out:%d\n",
                config->pdm_bd, config->pdm_in, config->pdm_out);
}

static int
intel_pdi_get_ch_cap(struct sdw_intel *sdw, unsigned int pdi_num, bool pcm)
{
        void __iomem *shim = sdw->link_res->shim;
        unsigned int link_id = sdw->instance;
        int count;

        if (pcm) {
                count = intel_readw(shim, SDW_SHIM_PCMSYCHC(link_id, pdi_num));

                /*
                 * WORKAROUND: on all existing Intel controllers, pdi
                 * number 2 reports channel count as 1 even though it
                 * supports 8 channels. Performing hardcoding for pdi
                 * number 2.
                 */
                if (pdi_num == 2)
                        count = 7;

        } else {
                count = intel_readw(shim, SDW_SHIM_PDMSCAP(link_id));
                count = FIELD_GET(SDW_SHIM_PDMSCAP_CPSS, count);
        }

        /* zero based values for channel count in register */
        count++;

        return count;
}

static int intel_pdi_get_ch_update(struct sdw_intel *sdw,
                                   struct sdw_cdns_pdi *pdi,
                                   unsigned int num_pdi,
                                   unsigned int *num_ch, bool pcm)
{
        int i, ch_count = 0;

        for (i = 0; i < num_pdi; i++) {
                pdi->ch_count = intel_pdi_get_ch_cap(sdw, pdi->num, pcm);
                ch_count += pdi->ch_count;
                pdi++;
        }

        *num_ch = ch_count;
        return 0;
}

static int intel_pdi_stream_ch_update(struct sdw_intel *sdw,
                                      struct sdw_cdns_streams *stream, bool pcm)
{
        intel_pdi_get_ch_update(sdw, stream->bd, stream->num_bd,
                                &stream->num_ch_bd, pcm);

        intel_pdi_get_ch_update(sdw, stream->in, stream->num_in,
                                &stream->num_ch_in, pcm);

        intel_pdi_get_ch_update(sdw, stream->out, stream->num_out,
                                &stream->num_ch_out, pcm);

        return 0;
}

static int intel_pdi_ch_update(struct sdw_intel *sdw)
{
        /* First update PCM streams followed by PDM streams */
        intel_pdi_stream_ch_update(sdw, &sdw->cdns.pcm, true);
        intel_pdi_stream_ch_update(sdw, &sdw->cdns.pdm, false);

        return 0;
}

static void
intel_pdi_shim_configure(struct sdw_intel *sdw, struct sdw_cdns_pdi *pdi)
{
        void __iomem *shim = sdw->link_res->shim;
        unsigned int link_id = sdw->instance;
        int pdi_conf = 0;

        /* the Bulk and PCM streams are not contiguous */
        pdi->intel_alh_id = (link_id * 16) + pdi->num + 3;
        if (pdi->num >= 2)
                pdi->intel_alh_id += 2;

        /*
         * Program stream parameters to stream SHIM register
         * This is applicable for PCM stream only.
         */
        if (pdi->type != SDW_STREAM_PCM)
                return;

        if (pdi->dir == SDW_DATA_DIR_RX)
                pdi_conf |= SDW_SHIM_PCMSYCM_DIR;
        else
                pdi_conf &= ~(SDW_SHIM_PCMSYCM_DIR);

        u32p_replace_bits(&pdi_conf, pdi->intel_alh_id, SDW_SHIM_PCMSYCM_STREAM);
        u32p_replace_bits(&pdi_conf, pdi->l_ch_num, SDW_SHIM_PCMSYCM_LCHN);
        u32p_replace_bits(&pdi_conf, pdi->h_ch_num, SDW_SHIM_PCMSYCM_HCHN);

        intel_writew(shim, SDW_SHIM_PCMSYCHM(link_id, pdi->num), pdi_conf);
}

static void
intel_pdi_alh_configure(struct sdw_intel *sdw, struct sdw_cdns_pdi *pdi)
{
        void __iomem *alh = sdw->link_res->alh;
        unsigned int link_id = sdw->instance;
        unsigned int conf;

        /* the Bulk and PCM streams are not contiguous */
        pdi->intel_alh_id = (link_id * 16) + pdi->num + 3;
        if (pdi->num >= 2)
                pdi->intel_alh_id += 2;

        /* Program Stream config ALH register */
        conf = intel_readl(alh, SDW_ALH_STRMZCFG(pdi->intel_alh_id));

        u32p_replace_bits(&conf, SDW_ALH_STRMZCFG_DMAT_VAL, SDW_ALH_STRMZCFG_DMAT);
        u32p_replace_bits(&conf, pdi->ch_count - 1, SDW_ALH_STRMZCFG_CHN);

        intel_writel(alh, SDW_ALH_STRMZCFG(pdi->intel_alh_id), conf);
}

static int intel_params_stream(struct sdw_intel *sdw,
                               struct snd_pcm_substream *substream,
                               struct snd_soc_dai *dai,
                               struct snd_pcm_hw_params *hw_params,
                               int link_id, int alh_stream_id)
{
        struct sdw_intel_link_res *res = sdw->link_res;
        struct sdw_intel_stream_params_data params_data;

        params_data.substream = substream;
        params_data.dai = dai;
        params_data.hw_params = hw_params;
        params_data.link_id = link_id;
        params_data.alh_stream_id = alh_stream_id;

        if (res->ops && res->ops->params_stream && res->dev)
                return res->ops->params_stream(res->dev,
                                               &params_data);
        return -EIO;
}

static int intel_free_stream(struct sdw_intel *sdw,
                             struct snd_pcm_substream *substream,
                             struct snd_soc_dai *dai,
                             int link_id)
{
        struct sdw_intel_link_res *res = sdw->link_res;
        struct sdw_intel_stream_free_data free_data;

        free_data.substream = substream;
        free_data.dai = dai;
        free_data.link_id = link_id;

        if (res->ops && res->ops->free_stream && res->dev)
                return res->ops->free_stream(res->dev,
                                             &free_data);

        return 0;
}

/*
 * bank switch routines
 */

static int intel_pre_bank_switch(struct sdw_bus *bus)
{
        struct sdw_cdns *cdns = bus_to_cdns(bus);
        struct sdw_intel *sdw = cdns_to_intel(cdns);

        /* Write to register only for multi-link */
        if (!bus->multi_link)
                return 0;

        intel_shim_sync_arm(sdw);

        return 0;
}

static int intel_post_bank_switch(struct sdw_bus *bus)
{
        struct sdw_cdns *cdns = bus_to_cdns(bus);
        struct sdw_intel *sdw = cdns_to_intel(cdns);
        void __iomem *shim = sdw->link_res->shim;
        int sync_reg, ret;

        /* Write to register only for multi-link */
        if (!bus->multi_link)
                return 0;

        mutex_lock(sdw->link_res->shim_lock);

        /* Read SYNC register */
        sync_reg = intel_readl(shim, SDW_SHIM_SYNC);

        /*
         * post_bank_switch() ops is called from the bus in loop for
         * all the Masters in the steam with the expectation that
         * we trigger the bankswitch for the only first Master in the list
         * and do nothing for the other Masters
         *
         * So, set the SYNCGO bit only if CMDSYNC bit is set for any Master.
         */
        if (!(sync_reg & SDW_SHIM_SYNC_CMDSYNC_MASK)) {
                ret = 0;
                goto unlock;
        }

        ret = intel_shim_sync_go_unlocked(sdw);
unlock:
        mutex_unlock(sdw->link_res->shim_lock);

        if (ret < 0)
                dev_err(sdw->cdns.dev, "Post bank switch failed: %d\n", ret);

        return ret;
}

/*
 * DAI routines
 */

static int intel_startup(struct snd_pcm_substream *substream,
                         struct snd_soc_dai *dai)
{
        struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
        int ret;

        ret = pm_runtime_get_sync(cdns->dev);
        if (ret < 0 && ret != -EACCES) {
                dev_err_ratelimited(cdns->dev,
                                    "pm_runtime_get_sync failed in %s, ret %d\n",
                                    __func__, ret);
                pm_runtime_put_noidle(cdns->dev);
                return ret;
        }
        return 0;
}

static int intel_hw_params(struct snd_pcm_substream *substream,
                           struct snd_pcm_hw_params *params,
                           struct snd_soc_dai *dai)
{
        struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
        struct sdw_intel *sdw = cdns_to_intel(cdns);
        struct sdw_cdns_dma_data *dma;
        struct sdw_cdns_pdi *pdi;
        struct sdw_stream_config sconfig;
        struct sdw_port_config *pconfig;
        int ch, dir;
        int ret;
        bool pcm = true;

        dma = snd_soc_dai_get_dma_data(dai, substream);
        if (!dma)
                return -EIO;

        ch = params_channels(params);
        if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
                dir = SDW_DATA_DIR_RX;
        else
                dir = SDW_DATA_DIR_TX;

        if (dma->stream_type == SDW_STREAM_PDM)
                pcm = false;

        if (pcm)
                pdi = sdw_cdns_alloc_pdi(cdns, &cdns->pcm, ch, dir, dai->id);
        else
                pdi = sdw_cdns_alloc_pdi(cdns, &cdns->pdm, ch, dir, dai->id);

        if (!pdi) {
                ret = -EINVAL;
                goto error;
        }

        /* do run-time configurations for SHIM, ALH and PDI/PORT */
        intel_pdi_shim_configure(sdw, pdi);
        intel_pdi_alh_configure(sdw, pdi);
        sdw_cdns_config_stream(cdns, ch, dir, pdi);

        /* store pdi and hw_params, may be needed in prepare step */
        dma->suspended = false;
        dma->pdi = pdi;
        dma->hw_params = params;

        /* Inform DSP about PDI stream number */
        ret = intel_params_stream(sdw, substream, dai, params,
                                  sdw->instance,
                                  pdi->intel_alh_id);
        if (ret)
                goto error;

        sconfig.direction = dir;
        sconfig.ch_count = ch;
        sconfig.frame_rate = params_rate(params);
        sconfig.type = dma->stream_type;

        if (dma->stream_type == SDW_STREAM_PDM) {
                sconfig.frame_rate *= 50;
                sconfig.bps = 1;
        } else {
                sconfig.bps = snd_pcm_format_width(params_format(params));
        }

        /* Port configuration */
        pconfig = kzalloc(sizeof(*pconfig), GFP_KERNEL);
        if (!pconfig) {
                ret =  -ENOMEM;
                goto error;
        }

        pconfig->num = pdi->num;
        pconfig->ch_mask = (1 << ch) - 1;

        ret = sdw_stream_add_master(&cdns->bus, &sconfig,
                                    pconfig, 1, dma->stream);
        if (ret)
                dev_err(cdns->dev, "add master to stream failed:%d\n", ret);

        kfree(pconfig);
error:
        return ret;
}

static int intel_prepare(struct snd_pcm_substream *substream,
                         struct snd_soc_dai *dai)
{
        struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
        struct sdw_intel *sdw = cdns_to_intel(cdns);
        struct sdw_cdns_dma_data *dma;
        int ch, dir;
        int ret = 0;

        dma = snd_soc_dai_get_dma_data(dai, substream);
        if (!dma) {
                dev_err(dai->dev, "failed to get dma data in %s\n",
                        __func__);
                return -EIO;
        }

        if (dma->suspended) {
                dma->suspended = false;

                /*
                 * .prepare() is called after system resume, where we
                 * need to reinitialize the SHIM/ALH/Cadence IP.
                 * .prepare() is also called to deal with underflows,
                 * but in those cases we cannot touch ALH/SHIM
                 * registers
                 */

                /* configure stream */
                ch = params_channels(dma->hw_params);
                if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
                        dir = SDW_DATA_DIR_RX;
                else
                        dir = SDW_DATA_DIR_TX;

                intel_pdi_shim_configure(sdw, dma->pdi);
                intel_pdi_alh_configure(sdw, dma->pdi);
                sdw_cdns_config_stream(cdns, ch, dir, dma->pdi);

                /* Inform DSP about PDI stream number */
                ret = intel_params_stream(sdw, substream, dai,
                                          dma->hw_params,
                                          sdw->instance,
                                          dma->pdi->intel_alh_id);
        }

        return ret;
}

static int
intel_hw_free(struct snd_pcm_substream *substream, struct snd_soc_dai *dai)
{
        struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
        struct sdw_intel *sdw = cdns_to_intel(cdns);
        struct sdw_cdns_dma_data *dma;
        int ret;

        dma = snd_soc_dai_get_dma_data(dai, substream);
        if (!dma)
                return -EIO;

        /*
         * The sdw stream state will transition to RELEASED when stream->
         * master_list is empty. So the stream state will transition to
         * DEPREPARED for the first cpu-dai and to RELEASED for the last
         * cpu-dai.
         */
        ret = sdw_stream_remove_master(&cdns->bus, dma->stream);
        if (ret < 0) {
                dev_err(dai->dev, "remove master from stream %s failed: %d\n",
                        dma->stream->name, ret);
                return ret;
        }

        ret = intel_free_stream(sdw, substream, dai, sdw->instance);
        if (ret < 0) {
                dev_err(dai->dev, "intel_free_stream: failed %d\n", ret);
                return ret;
        }

        dma->hw_params = NULL;
        dma->pdi = NULL;

        return 0;
}

static void intel_shutdown(struct snd_pcm_substream *substream,
                           struct snd_soc_dai *dai)
{
        struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);

        pm_runtime_mark_last_busy(cdns->dev);
        pm_runtime_put_autosuspend(cdns->dev);
}

static int intel_component_dais_suspend(struct snd_soc_component *component)
{
        struct sdw_cdns_dma_data *dma;
        struct snd_soc_dai *dai;

        for_each_component_dais(component, dai) {
                /*
                 * we don't have a .suspend dai_ops, and we don't have access
                 * to the substream, so let's mark both capture and playback
                 * DMA contexts as suspended
                 */
                dma = dai->playback_dma_data;
                if (dma)
                        dma->suspended = true;

                dma = dai->capture_dma_data;
                if (dma)
                        dma->suspended = true;
        }

        return 0;
}

static int intel_pcm_set_sdw_stream(struct snd_soc_dai *dai,
                                    void *stream, int direction)
{
        return cdns_set_sdw_stream(dai, stream, true, direction);
}

static int intel_pdm_set_sdw_stream(struct snd_soc_dai *dai,
                                    void *stream, int direction)
{
        return cdns_set_sdw_stream(dai, stream, false, direction);
}

static void *intel_get_sdw_stream(struct snd_soc_dai *dai,
                                  int direction)
{
        struct sdw_cdns_dma_data *dma;

        if (direction == SNDRV_PCM_STREAM_PLAYBACK)
                dma = dai->playback_dma_data;
        else
                dma = dai->capture_dma_data;

        if (!dma)
                return ERR_PTR(-EINVAL);

        return dma->stream;
}

static const struct snd_soc_dai_ops intel_pcm_dai_ops = {
        .startup = intel_startup,
        .hw_params = intel_hw_params,
        .prepare = intel_prepare,
        .hw_free = intel_hw_free,
        .shutdown = intel_shutdown,
        .set_sdw_stream = intel_pcm_set_sdw_stream,
        .get_sdw_stream = intel_get_sdw_stream,
};

static const struct snd_soc_dai_ops intel_pdm_dai_ops = {
        .startup = intel_startup,
        .hw_params = intel_hw_params,
        .prepare = intel_prepare,
        .hw_free = intel_hw_free,
        .shutdown = intel_shutdown,
        .set_sdw_stream = intel_pdm_set_sdw_stream,
        .get_sdw_stream = intel_get_sdw_stream,
};

static const struct snd_soc_component_driver dai_component = {
        .name           = "soundwire",
        .suspend        = intel_component_dais_suspend
};

static int intel_create_dai(struct sdw_cdns *cdns,
                            struct snd_soc_dai_driver *dais,
                            enum intel_pdi_type type,
                            u32 num, u32 off, u32 max_ch, bool pcm)
{
        int i;

        if (num == 0)
                return 0;

         /* TODO: Read supported rates/formats from hardware */
        for (i = off; i < (off + num); i++) {
                dais[i].name = devm_kasprintf(cdns->dev, GFP_KERNEL,
                                              "SDW%d Pin%d",
                                              cdns->instance, i);
                if (!dais[i].name)
                        return -ENOMEM;

                if (type == INTEL_PDI_BD || type == INTEL_PDI_OUT) {
                        dais[i].playback.channels_min = 1;
                        dais[i].playback.channels_max = max_ch;
                        dais[i].playback.rates = SNDRV_PCM_RATE_48000;
                        dais[i].playback.formats = SNDRV_PCM_FMTBIT_S16_LE;
                }

                if (type == INTEL_PDI_BD || type == INTEL_PDI_IN) {
                        dais[i].capture.channels_min = 1;
                        dais[i].capture.channels_max = max_ch;
                        dais[i].capture.rates = SNDRV_PCM_RATE_48000;
                        dais[i].capture.formats = SNDRV_PCM_FMTBIT_S16_LE;
                }

                if (pcm)
                        dais[i].ops = &intel_pcm_dai_ops;
                else
                        dais[i].ops = &intel_pdm_dai_ops;
        }

        return 0;
}

static int intel_register_dai(struct sdw_intel *sdw)
{
        struct sdw_cdns *cdns = &sdw->cdns;
        struct sdw_cdns_streams *stream;
        struct snd_soc_dai_driver *dais;
        int num_dai, ret, off = 0;

        /* DAIs are created based on total number of PDIs supported */
        num_dai = cdns->pcm.num_pdi + cdns->pdm.num_pdi;

        dais = devm_kcalloc(cdns->dev, num_dai, sizeof(*dais), GFP_KERNEL);
        if (!dais)
                return -ENOMEM;

        /* Create PCM DAIs */
        stream = &cdns->pcm;

        ret = intel_create_dai(cdns, dais, INTEL_PDI_IN, cdns->pcm.num_in,
                               off, stream->num_ch_in, true);
        if (ret)
                return ret;

        off += cdns->pcm.num_in;
        ret = intel_create_dai(cdns, dais, INTEL_PDI_OUT, cdns->pcm.num_out,
                               off, stream->num_ch_out, true);
        if (ret)
                return ret;

        off += cdns->pcm.num_out;
        ret = intel_create_dai(cdns, dais, INTEL_PDI_BD, cdns->pcm.num_bd,
                               off, stream->num_ch_bd, true);
        if (ret)
                return ret;

        /* Create PDM DAIs */
        stream = &cdns->pdm;
        off += cdns->pcm.num_bd;
        ret = intel_create_dai(cdns, dais, INTEL_PDI_IN, cdns->pdm.num_in,
                               off, stream->num_ch_in, false);
        if (ret)
                return ret;

        off += cdns->pdm.num_in;
        ret = intel_create_dai(cdns, dais, INTEL_PDI_OUT, cdns->pdm.num_out,
                               off, stream->num_ch_out, false);
        if (ret)
                return ret;

        off += cdns->pdm.num_out;
        ret = intel_create_dai(cdns, dais, INTEL_PDI_BD, cdns->pdm.num_bd,
                               off, stream->num_ch_bd, false);
        if (ret)
                return ret;

        return snd_soc_register_component(cdns->dev, &dai_component,
                                          dais, num_dai);
}

static int sdw_master_read_intel_prop(struct sdw_bus *bus)
{
        struct sdw_master_prop *prop = &bus->prop;
        struct fwnode_handle *link;
        char name[32];
        u32 quirk_mask;

        /* Find master handle */
        snprintf(name, sizeof(name),
                 "mipi-sdw-link-%d-subproperties", bus->link_id);

        link = device_get_named_child_node(bus->dev, name);
        if (!link) {
                dev_err(bus->dev, "Master node %s not found\n", name);
                return -EIO;
        }

        fwnode_property_read_u32(link,
                                 "intel-sdw-ip-clock",
                                 &prop->mclk_freq);

        /* the values reported by BIOS are the 2x clock, not the bus clock */
        prop->mclk_freq /= 2;

        fwnode_property_read_u32(link,
                                 "intel-quirk-mask",
                                 &quirk_mask);

        if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
                prop->hw_disabled = true;

        prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH |
                SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY;

        return 0;
}

static int intel_prop_read(struct sdw_bus *bus)
{
        /* Initialize with default handler to read all DisCo properties */
        sdw_master_read_prop(bus);

        /* read Intel-specific properties */
        sdw_master_read_intel_prop(bus);

        return 0;
}

static struct sdw_master_ops sdw_intel_ops = {
        .read_prop = sdw_master_read_prop,
        .override_adr = sdw_dmi_override_adr,
        .xfer_msg = cdns_xfer_msg,
        .xfer_msg_defer = cdns_xfer_msg_defer,
        .reset_page_addr = cdns_reset_page_addr,
        .set_bus_conf = cdns_bus_conf,
        .pre_bank_switch = intel_pre_bank_switch,
        .post_bank_switch = intel_post_bank_switch,
};

static int intel_init(struct sdw_intel *sdw)
{
        bool clock_stop;

        /* Initialize shim and controller */
        intel_link_power_up(sdw);

        clock_stop = sdw_cdns_is_clock_stop(&sdw->cdns);

        intel_shim_init(sdw, clock_stop);

        return 0;
}

/*
 * probe and init (aux_dev_id argument is required by function prototype but not used)
 */
static int intel_link_probe(struct auxiliary_device *auxdev,
                            const struct auxiliary_device_id *aux_dev_id)

{
        struct device *dev = &auxdev->dev;
        struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);
        struct sdw_intel *sdw;
        struct sdw_cdns *cdns;
        struct sdw_bus *bus;
        int ret;

        sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL);
        if (!sdw)
                return -ENOMEM;

        cdns = &sdw->cdns;
        bus = &cdns->bus;

        sdw->instance = auxdev->id;
        sdw->link_res = &ldev->link_res;
        cdns->dev = dev;
        cdns->registers = sdw->link_res->registers;
        cdns->instance = sdw->instance;
        cdns->msg_count = 0;

        bus->link_id = auxdev->id;

        sdw_cdns_probe(cdns);

        /* Set property read ops */
        sdw_intel_ops.read_prop = intel_prop_read;
        bus->ops = &sdw_intel_ops;

        /* set driver data, accessed by snd_soc_dai_get_drvdata() */
        dev_set_drvdata(dev, cdns);

        /* use generic bandwidth allocation algorithm */
        sdw->cdns.bus.compute_params = sdw_compute_params;

        ret = sdw_bus_master_add(bus, dev, dev->fwnode);
        if (ret) {
                dev_err(dev, "sdw_bus_master_add fail: %d\n", ret);
                return ret;
        }

        if (bus->prop.hw_disabled)
                dev_info(dev,
                         "SoundWire master %d is disabled, will be ignored\n",
                         bus->link_id);
        /*
         * Ignore BIOS err_threshold, it's a really bad idea when dealing
         * with multiple hardware synchronized links
         */
        bus->prop.err_threshold = 0;

        return 0;
}

int intel_link_startup(struct auxiliary_device *auxdev)
{
        struct sdw_cdns_stream_config config;
        struct device *dev = &auxdev->dev;
        struct sdw_cdns *cdns = dev_get_drvdata(dev);
        struct sdw_intel *sdw = cdns_to_intel(cdns);
        struct sdw_bus *bus = &cdns->bus;
        int link_flags;
        bool multi_link;
        u32 clock_stop_quirks;
        int ret;

        if (bus->prop.hw_disabled) {
                dev_info(dev,
                         "SoundWire master %d is disabled, ignoring\n",
                         sdw->instance);
                return 0;
        }

        link_flags = md_flags >> (bus->link_id * 8);
        multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
        if (!multi_link) {
                dev_dbg(dev, "Multi-link is disabled\n");
                bus->multi_link = false;
        } else {
                /*
                 * hardware-based synchronization is required regardless
                 * of the number of segments used by a stream: SSP-based
                 * synchronization is gated by gsync when the multi-master
                 * mode is set.
                 */
                bus->multi_link = true;
                bus->hw_sync_min_links = 1;
        }

        /* Initialize shim, controller */
        ret = intel_init(sdw);
        if (ret)
                goto err_init;

        /* Read the PDI config and initialize cadence PDI */
        intel_pdi_init(sdw, &config);
        ret = sdw_cdns_pdi_init(cdns, config);
        if (ret)
                goto err_init;

        intel_pdi_ch_update(sdw);

        ret = sdw_cdns_enable_interrupt(cdns, true);
        if (ret < 0) {
                dev_err(dev, "cannot enable interrupts\n");
                goto err_init;
        }

        /*
         * follow recommended programming flows to avoid timeouts when
         * gsync is enabled
         */
        if (multi_link)
                intel_shim_sync_arm(sdw);

        ret = sdw_cdns_init(cdns);
        if (ret < 0) {
                dev_err(dev, "unable to initialize Cadence IP\n");
                goto err_interrupt;
        }

        ret = sdw_cdns_exit_reset(cdns);
        if (ret < 0) {
                dev_err(dev, "unable to exit bus reset sequence\n");
                goto err_interrupt;
        }

        if (multi_link) {
                ret = intel_shim_sync_go(sdw);
                if (ret < 0) {
                        dev_err(dev, "sync go failed: %d\n", ret);
                        goto err_interrupt;
                }
        }
        sdw_cdns_check_self_clearing_bits(cdns, __func__,
                                          true, INTEL_MASTER_RESET_ITERATIONS);

        /* Register DAIs */
        ret = intel_register_dai(sdw);
        if (ret) {
                dev_err(dev, "DAI registration failed: %d\n", ret);
                snd_soc_unregister_component(dev);
                goto err_interrupt;
        }

        intel_debugfs_init(sdw);

        /* Enable runtime PM */
        if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) {
                pm_runtime_set_autosuspend_delay(dev,
                                                 INTEL_MASTER_SUSPEND_DELAY_MS);
                pm_runtime_use_autosuspend(dev);
                pm_runtime_mark_last_busy(dev);

                pm_runtime_set_active(dev);
                pm_runtime_enable(dev);
        }

        clock_stop_quirks = sdw->link_res->clock_stop_quirks;
        if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {
                /*
                 * To keep the clock running we need to prevent
                 * pm_runtime suspend from happening by increasing the
                 * reference count.
                 * This quirk is specified by the parent PCI device in
                 * case of specific latency requirements. It will have
                 * no effect if pm_runtime is disabled by the user via
                 * a module parameter for testing purposes.
                 */
                pm_runtime_get_noresume(dev);
        }

        /*
         * The runtime PM status of Slave devices is "Unsupported"
         * until they report as ATTACHED. If they don't, e.g. because
         * there are no Slave devices populated or if the power-on is
         * delayed or dependent on a power switch, the Master will
         * remain active and prevent its parent from suspending.
         *
         * Conditionally force the pm_runtime core to re-evaluate the
         * Master status in the absence of any Slave activity. A quirk
         * is provided to e.g. deal with Slaves that may be powered on
         * with a delay. A more complete solution would require the
         * definition of Master properties.
         */
        if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
                pm_runtime_idle(dev);

        sdw->startup_done = true;
        return 0;

err_interrupt:
        sdw_cdns_enable_interrupt(cdns, false);
err_init:
        return ret;
}

static void intel_link_remove(struct auxiliary_device *auxdev)
{
        struct device *dev = &auxdev->dev;
        struct sdw_cdns *cdns = dev_get_drvdata(dev);
        struct sdw_intel *sdw = cdns_to_intel(cdns);
        struct sdw_bus *bus = &cdns->bus;

        /*
         * Since pm_runtime is already disabled, we don't decrease
         * the refcount when the clock_stop_quirk is
         * SDW_INTEL_CLK_STOP_NOT_ALLOWED
         */
        if (!bus->prop.hw_disabled) {
                intel_debugfs_exit(sdw);
                sdw_cdns_enable_interrupt(cdns, false);
                snd_soc_unregister_component(dev);
        }
        sdw_bus_master_delete(bus);
}

int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)
{
        struct device *dev = &auxdev->dev;
        struct sdw_intel *sdw;
        struct sdw_bus *bus;
        void __iomem *shim;
        u16 wake_sts;

        sdw = dev_get_drvdata(dev);
        bus = &sdw->cdns.bus;

        if (bus->prop.hw_disabled || !sdw->startup_done) {
                dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
                        bus->link_id);
                return 0;
        }

        shim = sdw->link_res->shim;
        wake_sts = intel_readw(shim, SDW_SHIM_WAKESTS);

        if (!(wake_sts & BIT(sdw->instance)))
                return 0;

        /* disable WAKEEN interrupt ASAP to prevent interrupt flood */
        intel_shim_wake(sdw, false);

        /*
         * resume the Master, which will generate a bus reset and result in
         * Slaves re-attaching and be re-enumerated. The SoundWire physical
         * device which generated the wake will trigger an interrupt, which
         * will in turn cause the corresponding Linux Slave device to be
         * resumed and the Slave codec driver to check the status.
         */
        pm_request_resume(dev);

        return 0;
}

/*
 * PM calls
 */

static int intel_resume_child_device(struct device *dev, void *data)
{
        int ret;
        struct sdw_slave *slave = dev_to_sdw_dev(dev);

        if (!slave->probed) {
                dev_dbg(dev, "%s: skipping device, no probed driver\n", __func__);
                return 0;
        }
        if (!slave->dev_num_sticky) {
                dev_dbg(dev, "%s: skipping device, never detected on bus\n", __func__);
                return 0;
        }

        ret = pm_request_resume(dev);
        if (ret < 0)
                dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret);

        return ret;
}

static int __maybe_unused intel_pm_prepare(struct device *dev)
{
        struct sdw_cdns *cdns = dev_get_drvdata(dev);
        struct sdw_intel *sdw = cdns_to_intel(cdns);
        struct sdw_bus *bus = &cdns->bus;
        u32 clock_stop_quirks;
        int ret = 0;

        if (bus->prop.hw_disabled || !sdw->startup_done) {
                dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
                        bus->link_id);
                return 0;
        }

        clock_stop_quirks = sdw->link_res->clock_stop_quirks;

        if (pm_runtime_suspended(dev) &&
            pm_runtime_suspended(dev->parent) &&
            ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
             !clock_stop_quirks)) {
                /*
                 * if we've enabled clock stop, and the parent is suspended, the SHIM registers
                 * are not accessible and the shim wake cannot be disabled.
                 * The only solution is to resume the entire bus to full power
                 */

                /*
                 * If any operation in this block fails, we keep going since we don't want
                 * to prevent system suspend from happening and errors should be recoverable
                 * on resume.
                 */

                /*
                 * first resume the device for this link. This will also by construction
                 * resume the PCI parent device.
                 */
                ret = pm_request_resume(dev);
                if (ret < 0) {
                        dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret);
                        return 0;
                }

                /*
                 * Continue resuming the entire bus (parent + child devices) to exit
                 * the clock stop mode. If there are no devices connected on this link
                 * this is a no-op.
                 * The resume to full power could have been implemented with a .prepare
                 * step in SoundWire codec drivers. This would however require a lot
                 * of code to handle an Intel-specific corner case. It is simpler in
                 * practice to add a loop at the link level.
                 */
                ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);

                if (ret < 0)
                        dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret);
        }

        return 0;
}

static int __maybe_unused intel_suspend(struct device *dev)
{
        struct sdw_cdns *cdns = dev_get_drvdata(dev);
        struct sdw_intel *sdw = cdns_to_intel(cdns);
        struct sdw_bus *bus = &cdns->bus;
        u32 clock_stop_quirks;
        int ret;

        if (bus->prop.hw_disabled || !sdw->startup_done) {
                dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
                        bus->link_id);
                return 0;
        }

        if (pm_runtime_suspended(dev)) {
                dev_dbg(dev, "%s: pm_runtime status: suspended\n", __func__);

                clock_stop_quirks = sdw->link_res->clock_stop_quirks;

                if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
                    !clock_stop_quirks) {

                        if (pm_runtime_suspended(dev->parent)) {
                                /*
                                 * paranoia check: this should not happen with the .prepare
                                 * resume to full power
                                 */
                                dev_err(dev, "%s: invalid config: parent is suspended\n", __func__);
                        } else {
                                intel_shim_wake(sdw, false);
                        }
                }

                return 0;
        }

        ret = sdw_cdns_enable_interrupt(cdns, false);
        if (ret < 0) {
                dev_err(dev, "cannot disable interrupts on suspend\n");
                return ret;
        }

        ret = intel_link_power_down(sdw);
        if (ret) {
                dev_err(dev, "Link power down failed: %d\n", ret);
                return ret;
        }

        intel_shim_wake(sdw, false);

        return 0;
}

static int __maybe_unused intel_suspend_runtime(struct device *dev)
{
        struct sdw_cdns *cdns = dev_get_drvdata(dev);
        struct sdw_intel *sdw = cdns_to_intel(cdns);
        struct sdw_bus *bus = &cdns->bus;
        u32 clock_stop_quirks;
        int ret;

        if (bus->prop.hw_disabled || !sdw->startup_done) {
                dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
                        bus->link_id);
                return 0;
        }

        clock_stop_quirks = sdw->link_res->clock_stop_quirks;

        if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {

                ret = sdw_cdns_enable_interrupt(cdns, false);
                if (ret < 0) {
                        dev_err(dev, "cannot disable interrupts on suspend\n");
                        return ret;
                }

                ret = intel_link_power_down(sdw);
                if (ret) {
                        dev_err(dev, "Link power down failed: %d\n", ret);
                        return ret;
                }

                intel_shim_wake(sdw, false);

        } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET ||
                   !clock_stop_quirks) {
                bool wake_enable = true;

                ret = sdw_cdns_clock_stop(cdns, true);
                if (ret < 0) {
                        dev_err(dev, "cannot enable clock stop on suspend\n");
                        wake_enable = false;
                }

                ret = sdw_cdns_enable_interrupt(cdns, false);
                if (ret < 0) {
                        dev_err(dev, "cannot disable interrupts on suspend\n");
                        return ret;
                }

                ret = intel_link_power_down(sdw);
                if (ret) {
                        dev_err(dev, "Link power down failed: %d\n", ret);
                        return ret;
                }

                intel_shim_wake(sdw, wake_enable);
        } else {
                dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
                        __func__, clock_stop_quirks);
                ret = -EINVAL;
        }

        return ret;
}

static int __maybe_unused intel_resume(struct device *dev)
{
        struct sdw_cdns *cdns = dev_get_drvdata(dev);
        struct sdw_intel *sdw = cdns_to_intel(cdns);
        struct sdw_bus *bus = &cdns->bus;
        int link_flags;
        bool multi_link;
        int ret;

        if (bus->prop.hw_disabled || !sdw->startup_done) {
                dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
                        bus->link_id);
                return 0;
        }

        link_flags = md_flags >> (bus->link_id * 8);
        multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);

        if (pm_runtime_suspended(dev)) {
                dev_dbg(dev, "%s: pm_runtime status was suspended, forcing active\n", __func__);

                /* follow required sequence from runtime_pm.rst */
                pm_runtime_disable(dev);
                pm_runtime_set_active(dev);
                pm_runtime_mark_last_busy(dev);
                pm_runtime_enable(dev);

                link_flags = md_flags >> (bus->link_id * 8);

                if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
                        pm_runtime_idle(dev);
        }

        ret = intel_init(sdw);
        if (ret) {
                dev_err(dev, "%s failed: %d\n", __func__, ret);
                return ret;
        }

        /*
         * make sure all Slaves are tagged as UNATTACHED and provide
         * reason for reinitialization
         */
        sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);

        ret = sdw_cdns_enable_interrupt(cdns, true);
        if (ret < 0) {
                dev_err(dev, "cannot enable interrupts during resume\n");
                return ret;
        }

        /*
         * follow recommended programming flows to avoid timeouts when
         * gsync is enabled
         */
        if (multi_link)
                intel_shim_sync_arm(sdw);

        ret = sdw_cdns_init(&sdw->cdns);
        if (ret < 0) {
                dev_err(dev, "unable to initialize Cadence IP during resume\n");
                return ret;
        }

        ret = sdw_cdns_exit_reset(cdns);
        if (ret < 0) {
                dev_err(dev, "unable to exit bus reset sequence during resume\n");
                return ret;
        }

        if (multi_link) {
                ret = intel_shim_sync_go(sdw);
                if (ret < 0) {
                        dev_err(dev, "sync go failed during resume\n");
                        return ret;
                }
        }
        sdw_cdns_check_self_clearing_bits(cdns, __func__,
                                          true, INTEL_MASTER_RESET_ITERATIONS);

        /*
         * after system resume, the pm_runtime suspend() may kick in
         * during the enumeration, before any children device force the
         * master device to remain active.  Using pm_runtime_get()
         * routines is not really possible, since it'd prevent the
         * master from suspending.
         * A reasonable compromise is to update the pm_runtime
         * counters and delay the pm_runtime suspend by several
         * seconds, by when all enumeration should be complete.
         */
        pm_runtime_mark_last_busy(dev);

        return ret;
}

static int __maybe_unused intel_resume_runtime(struct device *dev)
{
        struct sdw_cdns *cdns = dev_get_drvdata(dev);
        struct sdw_intel *sdw = cdns_to_intel(cdns);
        struct sdw_bus *bus = &cdns->bus;
        u32 clock_stop_quirks;
        bool clock_stop0;
        int link_flags;
        bool multi_link;
        int status;
        int ret;

        if (bus->prop.hw_disabled || !sdw->startup_done) {
                dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
                        bus->link_id);
                return 0;
        }

        link_flags = md_flags >> (bus->link_id * 8);
        multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);

        clock_stop_quirks = sdw->link_res->clock_stop_quirks;

        if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
                ret = intel_init(sdw);
                if (ret) {
                        dev_err(dev, "%s failed: %d\n", __func__, ret);
                        return ret;
                }

                /*
                 * make sure all Slaves are tagged as UNATTACHED and provide
                 * reason for reinitialization
                 */
                sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);

                ret = sdw_cdns_enable_interrupt(cdns, true);
                if (ret < 0) {
                        dev_err(dev, "cannot enable interrupts during resume\n");
                        return ret;
                }

                /*
                 * follow recommended programming flows to avoid
                 * timeouts when gsync is enabled
                 */
                if (multi_link)
                        intel_shim_sync_arm(sdw);

                ret = sdw_cdns_init(&sdw->cdns);
                if (ret < 0) {
                        dev_err(dev, "unable to initialize Cadence IP during resume\n");
                        return ret;
                }

                ret = sdw_cdns_exit_reset(cdns);
                if (ret < 0) {
                        dev_err(dev, "unable to exit bus reset sequence during resume\n");
                        return ret;
                }

                if (multi_link) {
                        ret = intel_shim_sync_go(sdw);
                        if (ret < 0) {
                                dev_err(dev, "sync go failed during resume\n");
                                return ret;
                        }
                }
                sdw_cdns_check_self_clearing_bits(cdns, "intel_resume_runtime TEARDOWN",
                                                  true, INTEL_MASTER_RESET_ITERATIONS);

        } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
                ret = intel_init(sdw);
                if (ret) {
                        dev_err(dev, "%s failed: %d\n", __func__, ret);
                        return ret;
                }

                /*
                 * An exception condition occurs for the CLK_STOP_BUS_RESET
                 * case if one or more masters remain active. In this condition,
                 * all the masters are powered on for they are in the same power
                 * domain. Master can preserve its context for clock stop0, so
                 * there is no need to clear slave status and reset bus.
                 */
                clock_stop0 = sdw_cdns_is_clock_stop(&sdw->cdns);

                if (!clock_stop0) {

                        /*
                         * make sure all Slaves are tagged as UNATTACHED and
                         * provide reason for reinitialization
                         */

                        status = SDW_UNATTACH_REQUEST_MASTER_RESET;
                        sdw_clear_slave_status(bus, status);

                        ret = sdw_cdns_enable_interrupt(cdns, true);
                        if (ret < 0) {
                                dev_err(dev, "cannot enable interrupts during resume\n");
                                return ret;
                        }

                        /*
                         * follow recommended programming flows to avoid
                         * timeouts when gsync is enabled
                         */
                        if (multi_link)
                                intel_shim_sync_arm(sdw);

                        /*
                         * Re-initialize the IP since it was powered-off
                         */
                        sdw_cdns_init(&sdw->cdns);

                } else {
                        ret = sdw_cdns_enable_interrupt(cdns, true);
                        if (ret < 0) {
                                dev_err(dev, "cannot enable interrupts during resume\n");
                                return ret;
                        }
                }

                ret = sdw_cdns_clock_restart(cdns, !clock_stop0);
                if (ret < 0) {
                        dev_err(dev, "unable to restart clock during resume\n");
                        return ret;
                }

                if (!clock_stop0) {
                        ret = sdw_cdns_exit_reset(cdns);
                        if (ret < 0) {
                                dev_err(dev, "unable to exit bus reset sequence during resume\n");
                                return ret;
                        }

                        if (multi_link) {
                                ret = intel_shim_sync_go(sdw);
                                if (ret < 0) {
                                        dev_err(sdw->cdns.dev, "sync go failed during resume\n");
                                        return ret;
                                }
                        }
                }
                sdw_cdns_check_self_clearing_bits(cdns, "intel_resume_runtime BUS_RESET",
                                                  true, INTEL_MASTER_RESET_ITERATIONS);

        } else if (!clock_stop_quirks) {

                clock_stop0 = sdw_cdns_is_clock_stop(&sdw->cdns);
                if (!clock_stop0)
                        dev_err(dev, "%s invalid configuration, clock was not stopped", __func__);

                ret = intel_init(sdw);
                if (ret) {
                        dev_err(dev, "%s failed: %d\n", __func__, ret);
                        return ret;
                }

                ret = sdw_cdns_enable_interrupt(cdns, true);
                if (ret < 0) {
                        dev_err(dev, "cannot enable interrupts during resume\n");
                        return ret;
                }

                ret = sdw_cdns_clock_restart(cdns, false);
                if (ret < 0) {
                        dev_err(dev, "unable to resume master during resume\n");
                        return ret;
                }

                sdw_cdns_check_self_clearing_bits(cdns, "intel_resume_runtime no_quirks",
                                                  true, INTEL_MASTER_RESET_ITERATIONS);
        } else {
                dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
                        __func__, clock_stop_quirks);
                ret = -EINVAL;
        }

        return ret;
}

static const struct dev_pm_ops intel_pm = {

        .prepare = intel_pm_prepare,
        SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
        SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL)
};

static const struct auxiliary_device_id intel_link_id_table[] = {
        { .name = "soundwire_intel.link" },
        {},
};
MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table);

static struct auxiliary_driver sdw_intel_drv = {
        .probe = intel_link_probe,
        .remove = intel_link_remove,
        .driver = {
                /* auxiliary_driver_register() sets .name to be the modname */
                .pm = &intel_pm,
        },
        .id_table = intel_link_id_table
};
module_auxiliary_driver(sdw_intel_drv);

MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Intel Soundwire Link Driver");