// SPDX-License-Identifier: GPL-2.0
/*
 * ti-sysc.c - Texas Instruments sysc interconnect target driver
 */

#include <linux/io.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/delay.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <linux/iopoll.h>

#include <linux/platform_data/ti-sysc.h>

#include <dt-bindings/bus/ti-sysc.h>

#define DIS_ISP         BIT(2)
#define DIS_IVA         BIT(1)
#define DIS_SGX         BIT(0)

#define SOC_FLAG(match, flag)   { .machine = match, .data = (void *)(flag), }

#define MAX_MODULE_SOFTRESET_WAIT               10000

enum sysc_soc {
        SOC_UNKNOWN,
        SOC_2420,
        SOC_2430,
        SOC_3430,
        SOC_3630,
        SOC_4430,
        SOC_4460,
        SOC_4470,
        SOC_5430,
        SOC_AM3,
        SOC_AM4,
        SOC_DRA7,
};

struct sysc_address {
        unsigned long base;
        struct list_head node;
};

struct sysc_soc_info {
        unsigned long general_purpose:1;
        enum sysc_soc soc;
        struct mutex list_lock;                 /* disabled modules list lock */
        struct list_head disabled_modules;
};

enum sysc_clocks {
        SYSC_FCK,
        SYSC_ICK,
        SYSC_OPTFCK0,
        SYSC_OPTFCK1,
        SYSC_OPTFCK2,
        SYSC_OPTFCK3,
        SYSC_OPTFCK4,
        SYSC_OPTFCK5,
        SYSC_OPTFCK6,
        SYSC_OPTFCK7,
        SYSC_MAX_CLOCKS,
};

static struct sysc_soc_info *sysc_soc;
static const char * const reg_names[] = { "rev", "sysc", "syss", };
static const char * const clock_names[SYSC_MAX_CLOCKS] = {
        "fck", "ick", "opt0", "opt1", "opt2", "opt3", "opt4",
        "opt5", "opt6", "opt7",
};

#define SYSC_IDLEMODE_MASK              3
#define SYSC_CLOCKACTIVITY_MASK         3

/**
 * struct sysc - TI sysc interconnect target module registers and capabilities
 * @dev: struct device pointer
 * @module_pa: physical address of the interconnect target module
 * @module_size: size of the interconnect target module
 * @module_va: virtual address of the interconnect target module
 * @offsets: register offsets from module base
 * @mdata: ti-sysc to hwmod translation data for a module
 * @clocks: clocks used by the interconnect target module
 * @clock_roles: clock role names for the found clocks
 * @nr_clocks: number of clocks used by the interconnect target module
 * @rsts: resets used by the interconnect target module
 * @legacy_mode: configured for legacy mode if set
 * @cap: interconnect target module capabilities
 * @cfg: interconnect target module configuration
 * @cookie: data used by legacy platform callbacks
 * @name: name if available
 * @revision: interconnect target module revision
 * @reserved: target module is reserved and already in use
 * @enabled: sysc runtime enabled status
 * @needs_resume: runtime resume needed on resume from suspend
 * @child_needs_resume: runtime resume needed for child on resume from suspend
 * @disable_on_idle: status flag used for disabling modules with resets
 * @idle_work: work structure used to perform delayed idle on a module
 * @pre_reset_quirk: module specific pre-reset quirk
 * @post_reset_quirk: module specific post-reset quirk
 * @reset_done_quirk: module specific reset done quirk
 * @module_enable_quirk: module specific enable quirk
 * @module_disable_quirk: module specific disable quirk
 * @module_unlock_quirk: module specific sysconfig unlock quirk
 * @module_lock_quirk: module specific sysconfig lock quirk
 */
struct sysc {
        struct device *dev;
        u64 module_pa;
        u32 module_size;
        void __iomem *module_va;
        int offsets[SYSC_MAX_REGS];
        struct ti_sysc_module_data *mdata;
        struct clk **clocks;
        const char **clock_roles;
        int nr_clocks;
        struct reset_control *rsts;
        const char *legacy_mode;
        const struct sysc_capabilities *cap;
        struct sysc_config cfg;
        struct ti_sysc_cookie cookie;
        const char *name;
        u32 revision;
        unsigned int reserved:1;
        unsigned int enabled:1;
        unsigned int needs_resume:1;
        unsigned int child_needs_resume:1;
        struct delayed_work idle_work;
        void (*pre_reset_quirk)(struct sysc *sysc);
        void (*post_reset_quirk)(struct sysc *sysc);
        void (*reset_done_quirk)(struct sysc *sysc);
        void (*module_enable_quirk)(struct sysc *sysc);
        void (*module_disable_quirk)(struct sysc *sysc);
        void (*module_unlock_quirk)(struct sysc *sysc);
        void (*module_lock_quirk)(struct sysc *sysc);
};

static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
                                  bool is_child);

static void sysc_write(struct sysc *ddata, int offset, u32 value)
{
        if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) {
                writew_relaxed(value & 0xffff, ddata->module_va + offset);

                /* Only i2c revision has LO and HI register with stride of 4 */
                if (ddata->offsets[SYSC_REVISION] >= 0 &&
                    offset == ddata->offsets[SYSC_REVISION]) {
                        u16 hi = value >> 16;

                        writew_relaxed(hi, ddata->module_va + offset + 4);
                }

                return;
        }

        writel_relaxed(value, ddata->module_va + offset);
}

static u32 sysc_read(struct sysc *ddata, int offset)
{
        if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) {
                u32 val;

                val = readw_relaxed(ddata->module_va + offset);

                /* Only i2c revision has LO and HI register with stride of 4 */
                if (ddata->offsets[SYSC_REVISION] >= 0 &&
                    offset == ddata->offsets[SYSC_REVISION]) {
                        u16 tmp = readw_relaxed(ddata->module_va + offset + 4);

                        val |= tmp << 16;
                }

                return val;
        }

        return readl_relaxed(ddata->module_va + offset);
}

static bool sysc_opt_clks_needed(struct sysc *ddata)
{
        return !!(ddata->cfg.quirks & SYSC_QUIRK_OPT_CLKS_NEEDED);
}

static u32 sysc_read_revision(struct sysc *ddata)
{
        int offset = ddata->offsets[SYSC_REVISION];

        if (offset < 0)
                return 0;

        return sysc_read(ddata, offset);
}

static u32 sysc_read_sysconfig(struct sysc *ddata)
{
        int offset = ddata->offsets[SYSC_SYSCONFIG];

        if (offset < 0)
                return 0;

        return sysc_read(ddata, offset);
}

static u32 sysc_read_sysstatus(struct sysc *ddata)
{
        int offset = ddata->offsets[SYSC_SYSSTATUS];

        if (offset < 0)
                return 0;

        return sysc_read(ddata, offset);
}

/* Poll on reset status */
static int sysc_wait_softreset(struct sysc *ddata)
{
        u32 sysc_mask, syss_done, rstval;
        int syss_offset, error = 0;

        if (ddata->cap->regbits->srst_shift < 0)
                return 0;

        syss_offset = ddata->offsets[SYSC_SYSSTATUS];
        sysc_mask = BIT(ddata->cap->regbits->srst_shift);

        if (ddata->cfg.quirks & SYSS_QUIRK_RESETDONE_INVERTED)
                syss_done = 0;
        else
                syss_done = ddata->cfg.syss_mask;

        if (syss_offset >= 0) {
                error = readx_poll_timeout_atomic(sysc_read_sysstatus, ddata,
                                rstval, (rstval & ddata->cfg.syss_mask) ==
                                syss_done, 100, MAX_MODULE_SOFTRESET_WAIT);

        } else if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS) {
                error = readx_poll_timeout_atomic(sysc_read_sysconfig, ddata,
                                rstval, !(rstval & sysc_mask),
                                100, MAX_MODULE_SOFTRESET_WAIT);
        }

        return error;
}

static int sysc_add_named_clock_from_child(struct sysc *ddata,
                                           const char *name,
                                           const char *optfck_name)
{
        struct device_node *np = ddata->dev->of_node;
        struct device_node *child;
        struct clk_lookup *cl;
        struct clk *clock;
        const char *n;

        if (name)
                n = name;
        else
                n = optfck_name;

        /* Does the clock alias already exist? */
        clock = of_clk_get_by_name(np, n);
        if (!IS_ERR(clock)) {
                clk_put(clock);

                return 0;
        }

        child = of_get_next_available_child(np, NULL);
        if (!child)
                return -ENODEV;

        clock = devm_get_clk_from_child(ddata->dev, child, name);
        if (IS_ERR(clock))
                return PTR_ERR(clock);

        /*
         * Use clkdev_add() instead of clkdev_alloc() to avoid the MAX_DEV_ID
         * limit for clk_get(). If cl ever needs to be freed, it should be done
         * with clkdev_drop().
         */
        cl = kzalloc(sizeof(*cl), GFP_KERNEL);
        if (!cl)
                return -ENOMEM;

        cl->con_id = n;
        cl->dev_id = dev_name(ddata->dev);
        cl->clk = clock;
        clkdev_add(cl);

        clk_put(clock);

        return 0;
}

static int sysc_init_ext_opt_clock(struct sysc *ddata, const char *name)
{
        const char *optfck_name;
        int error, index;

        if (ddata->nr_clocks < SYSC_OPTFCK0)
                index = SYSC_OPTFCK0;
        else
                index = ddata->nr_clocks;

        if (name)
                optfck_name = name;
        else
                optfck_name = clock_names[index];

        error = sysc_add_named_clock_from_child(ddata, name, optfck_name);
        if (error)
                return error;

        ddata->clock_roles[index] = optfck_name;
        ddata->nr_clocks++;

        return 0;
}

static int sysc_get_one_clock(struct sysc *ddata, const char *name)
{
        int error, i, index = -ENODEV;

        if (!strncmp(clock_names[SYSC_FCK], name, 3))
                index = SYSC_FCK;
        else if (!strncmp(clock_names[SYSC_ICK], name, 3))
                index = SYSC_ICK;

        if (index < 0) {
                for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
                        if (!ddata->clocks[i]) {
                                index = i;
                                break;
                        }
                }
        }

        if (index < 0) {
                dev_err(ddata->dev, "clock %s not added\n", name);
                return index;
        }

        ddata->clocks[index] = devm_clk_get(ddata->dev, name);
        if (IS_ERR(ddata->clocks[index])) {
                dev_err(ddata->dev, "clock get error for %s: %li\n",
                        name, PTR_ERR(ddata->clocks[index]));

                return PTR_ERR(ddata->clocks[index]);
        }

        error = clk_prepare(ddata->clocks[index]);
        if (error) {
                dev_err(ddata->dev, "clock prepare error for %s: %i\n",
                        name, error);

                return error;
        }

        return 0;
}

static int sysc_get_clocks(struct sysc *ddata)
{
        struct device_node *np = ddata->dev->of_node;
        struct property *prop;
        const char *name;
        int nr_fck = 0, nr_ick = 0, i, error = 0;

        ddata->clock_roles = devm_kcalloc(ddata->dev,
                                          SYSC_MAX_CLOCKS,
                                          sizeof(*ddata->clock_roles),
                                          GFP_KERNEL);
        if (!ddata->clock_roles)
                return -ENOMEM;

        of_property_for_each_string(np, "clock-names", prop, name) {
                if (!strncmp(clock_names[SYSC_FCK], name, 3))
                        nr_fck++;
                if (!strncmp(clock_names[SYSC_ICK], name, 3))
                        nr_ick++;
                ddata->clock_roles[ddata->nr_clocks] = name;
                ddata->nr_clocks++;
        }

        if (ddata->nr_clocks < 1)
                return 0;

        if ((ddata->cfg.quirks & SYSC_QUIRK_EXT_OPT_CLOCK)) {
                error = sysc_init_ext_opt_clock(ddata, NULL);
                if (error)
                        return error;
        }

        if (ddata->nr_clocks > SYSC_MAX_CLOCKS) {
                dev_err(ddata->dev, "too many clocks for %pOF\n", np);

                return -EINVAL;
        }

        if (nr_fck > 1 || nr_ick > 1) {
                dev_err(ddata->dev, "max one fck and ick for %pOF\n", np);

                return -EINVAL;
        }

        /* Always add a slot for main clocks fck and ick even if unused */
        if (!nr_fck)
                ddata->nr_clocks++;
        if (!nr_ick)
                ddata->nr_clocks++;

        ddata->clocks = devm_kcalloc(ddata->dev,
                                     ddata->nr_clocks, sizeof(*ddata->clocks),
                                     GFP_KERNEL);
        if (!ddata->clocks)
                return -ENOMEM;

        for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
                const char *name = ddata->clock_roles[i];

                if (!name)
                        continue;

                error = sysc_get_one_clock(ddata, name);
                if (error)
                        return error;
        }

        return 0;
}

static int sysc_enable_main_clocks(struct sysc *ddata)
{
        struct clk *clock;
        int i, error;

        if (!ddata->clocks)
                return 0;

        for (i = 0; i < SYSC_OPTFCK0; i++) {
                clock = ddata->clocks[i];

                /* Main clocks may not have ick */
                if (IS_ERR_OR_NULL(clock))
                        continue;

                error = clk_enable(clock);
                if (error)
                        goto err_disable;
        }

        return 0;

err_disable:
        for (i--; i >= 0; i--) {
                clock = ddata->clocks[i];

                /* Main clocks may not have ick */
                if (IS_ERR_OR_NULL(clock))
                        continue;

                clk_disable(clock);
        }

        return error;
}

static void sysc_disable_main_clocks(struct sysc *ddata)
{
        struct clk *clock;
        int i;

        if (!ddata->clocks)
                return;

        for (i = 0; i < SYSC_OPTFCK0; i++) {
                clock = ddata->clocks[i];
                if (IS_ERR_OR_NULL(clock))
                        continue;

                clk_disable(clock);
        }
}

static int sysc_enable_opt_clocks(struct sysc *ddata)
{
        struct clk *clock;
        int i, error;

        if (!ddata->clocks || ddata->nr_clocks < SYSC_OPTFCK0 + 1)
                return 0;

        for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
                clock = ddata->clocks[i];

                /* Assume no holes for opt clocks */
                if (IS_ERR_OR_NULL(clock))
                        return 0;

                error = clk_enable(clock);
                if (error)
                        goto err_disable;
        }

        return 0;

err_disable:
        for (i--; i >= 0; i--) {
                clock = ddata->clocks[i];
                if (IS_ERR_OR_NULL(clock))
                        continue;

                clk_disable(clock);
        }

        return error;
}

static void sysc_disable_opt_clocks(struct sysc *ddata)
{
        struct clk *clock;
        int i;

        if (!ddata->clocks || ddata->nr_clocks < SYSC_OPTFCK0 + 1)
                return;

        for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
                clock = ddata->clocks[i];

                /* Assume no holes for opt clocks */
                if (IS_ERR_OR_NULL(clock))
                        return;

                clk_disable(clock);
        }
}

static void sysc_clkdm_deny_idle(struct sysc *ddata)
{
        struct ti_sysc_platform_data *pdata;

        if (ddata->legacy_mode || (ddata->cfg.quirks & SYSC_QUIRK_CLKDM_NOAUTO))
                return;

        pdata = dev_get_platdata(ddata->dev);
        if (pdata && pdata->clkdm_deny_idle)
                pdata->clkdm_deny_idle(ddata->dev, &ddata->cookie);
}

static void sysc_clkdm_allow_idle(struct sysc *ddata)
{
        struct ti_sysc_platform_data *pdata;

        if (ddata->legacy_mode || (ddata->cfg.quirks & SYSC_QUIRK_CLKDM_NOAUTO))
                return;

        pdata = dev_get_platdata(ddata->dev);
        if (pdata && pdata->clkdm_allow_idle)
                pdata->clkdm_allow_idle(ddata->dev, &ddata->cookie);
}

/**
 * sysc_init_resets - init rstctrl reset line if configured
 * @ddata: device driver data
 *
 * See sysc_rstctrl_reset_deassert().
 */
static int sysc_init_resets(struct sysc *ddata)
{
        ddata->rsts =
                devm_reset_control_get_optional_shared(ddata->dev, "rstctrl");

        return PTR_ERR_OR_ZERO(ddata->rsts);
}

/**
 * sysc_parse_and_check_child_range - parses module IO region from ranges
 * @ddata: device driver data
 *
 * In general we only need rev, syss, and sysc registers and not the whole
 * module range. But we do want the offsets for these registers from the
 * module base. This allows us to check them against the legacy hwmod
 * platform data. Let's also check the ranges are configured properly.
 */
static int sysc_parse_and_check_child_range(struct sysc *ddata)
{
        struct device_node *np = ddata->dev->of_node;
        const __be32 *ranges;
        u32 nr_addr, nr_size;
        int len, error;

        ranges = of_get_property(np, "ranges", &len);
        if (!ranges) {
                dev_err(ddata->dev, "missing ranges for %pOF\n", np);

                return -ENOENT;
        }

        len /= sizeof(*ranges);

        if (len < 3) {
                dev_err(ddata->dev, "incomplete ranges for %pOF\n", np);

                return -EINVAL;
        }

        error = of_property_read_u32(np, "#address-cells", &nr_addr);
        if (error)
                return -ENOENT;

        error = of_property_read_u32(np, "#size-cells", &nr_size);
        if (error)
                return -ENOENT;

        if (nr_addr != 1 || nr_size != 1) {
                dev_err(ddata->dev, "invalid ranges for %pOF\n", np);

                return -EINVAL;
        }

        ranges++;
        ddata->module_pa = of_translate_address(np, ranges++);
        ddata->module_size = be32_to_cpup(ranges);

        return 0;
}

/* Interconnect instances to probe before l4_per instances */
static struct resource early_bus_ranges[] = {
        /* am3/4 l4_wkup */
        { .start = 0x44c00000, .end = 0x44c00000 + 0x300000, },
        /* omap4/5 and dra7 l4_cfg */
        { .start = 0x4a000000, .end = 0x4a000000 + 0x300000, },
        /* omap4 l4_wkup */
        { .start = 0x4a300000, .end = 0x4a300000 + 0x30000,  },
        /* omap5 and dra7 l4_wkup without dra7 dcan segment */
        { .start = 0x4ae00000, .end = 0x4ae00000 + 0x30000,  },
};

static atomic_t sysc_defer = ATOMIC_INIT(10);

/**
 * sysc_defer_non_critical - defer non_critical interconnect probing
 * @ddata: device driver data
 *
 * We want to probe l4_cfg and l4_wkup interconnect instances before any
 * l4_per instances as l4_per instances depend on resources on l4_cfg and
 * l4_wkup interconnects.
 */
static int sysc_defer_non_critical(struct sysc *ddata)
{
        struct resource *res;
        int i;

        if (!atomic_read(&sysc_defer))
                return 0;

        for (i = 0; i < ARRAY_SIZE(early_bus_ranges); i++) {
                res = &early_bus_ranges[i];
                if (ddata->module_pa >= res->start &&
                    ddata->module_pa <= res->end) {
                        atomic_set(&sysc_defer, 0);

                        return 0;
                }
        }

        atomic_dec_if_positive(&sysc_defer);

        return -EPROBE_DEFER;
}

static struct device_node *stdout_path;

static void sysc_init_stdout_path(struct sysc *ddata)
{
        struct device_node *np = NULL;
        const char *uart;

        if (IS_ERR(stdout_path))
                return;

        if (stdout_path)
                return;

        np = of_find_node_by_path("/chosen");
        if (!np)
                goto err;

        uart = of_get_property(np, "stdout-path", NULL);
        if (!uart)
                goto err;

        np = of_find_node_by_path(uart);
        if (!np)
                goto err;

        stdout_path = np;

        return;

err:
        stdout_path = ERR_PTR(-ENODEV);
}

static void sysc_check_quirk_stdout(struct sysc *ddata,
                                    struct device_node *np)
{
        sysc_init_stdout_path(ddata);
        if (np != stdout_path)
                return;

        ddata->cfg.quirks |= SYSC_QUIRK_NO_IDLE_ON_INIT |
                                SYSC_QUIRK_NO_RESET_ON_INIT;
}

/**
 * sysc_check_one_child - check child configuration
 * @ddata: device driver data
 * @np: child device node
 *
 * Let's avoid messy situations where we have new interconnect target
 * node but children have "ti,hwmods". These belong to the interconnect
 * target node and are managed by this driver.
 */
static void sysc_check_one_child(struct sysc *ddata,
                                 struct device_node *np)
{
        const char *name;

        name = of_get_property(np, "ti,hwmods", NULL);
        if (name && !of_device_is_compatible(np, "ti,sysc"))
                dev_warn(ddata->dev, "really a child ti,hwmods property?");

        sysc_check_quirk_stdout(ddata, np);
        sysc_parse_dts_quirks(ddata, np, true);
}

static void sysc_check_children(struct sysc *ddata)
{
        struct device_node *child;

        for_each_child_of_node(ddata->dev->of_node, child)
                sysc_check_one_child(ddata, child);
}

/*
 * So far only I2C uses 16-bit read access with clockactivity with revision
 * in two registers with stride of 4. We can detect this based on the rev
 * register size to configure things far enough to be able to properly read
 * the revision register.
 */
static void sysc_check_quirk_16bit(struct sysc *ddata, struct resource *res)
{
        if (resource_size(res) == 8)
                ddata->cfg.quirks |= SYSC_QUIRK_16BIT | SYSC_QUIRK_USE_CLOCKACT;
}

/**
 * sysc_parse_one - parses the interconnect target module registers
 * @ddata: device driver data
 * @reg: register to parse
 */
static int sysc_parse_one(struct sysc *ddata, enum sysc_registers reg)
{
        struct resource *res;
        const char *name;

        switch (reg) {
        case SYSC_REVISION:
        case SYSC_SYSCONFIG:
        case SYSC_SYSSTATUS:
                name = reg_names[reg];
                break;
        default:
                return -EINVAL;
        }

        res = platform_get_resource_byname(to_platform_device(ddata->dev),
                                           IORESOURCE_MEM, name);
        if (!res) {
                ddata->offsets[reg] = -ENODEV;

                return 0;
        }

        ddata->offsets[reg] = res->start - ddata->module_pa;
        if (reg == SYSC_REVISION)
                sysc_check_quirk_16bit(ddata, res);

        return 0;
}

static int sysc_parse_registers(struct sysc *ddata)
{
        int i, error;

        for (i = 0; i < SYSC_MAX_REGS; i++) {
                error = sysc_parse_one(ddata, i);
                if (error)
                        return error;
        }

        return 0;
}

/**
 * sysc_check_registers - check for misconfigured register overlaps
 * @ddata: device driver data
 */
static int sysc_check_registers(struct sysc *ddata)
{
        int i, j, nr_regs = 0, nr_matches = 0;

        for (i = 0; i < SYSC_MAX_REGS; i++) {
                if (ddata->offsets[i] < 0)
                        continue;

                if (ddata->offsets[i] > (ddata->module_size - 4)) {
                        dev_err(ddata->dev, "register outside module range");

                                return -EINVAL;
                }

                for (j = 0; j < SYSC_MAX_REGS; j++) {
                        if (ddata->offsets[j] < 0)
                                continue;

                        if (ddata->offsets[i] == ddata->offsets[j])
                                nr_matches++;
                }
                nr_regs++;
        }

        if (nr_matches > nr_regs) {
                dev_err(ddata->dev, "overlapping registers: (%i/%i)",
                        nr_regs, nr_matches);

                return -EINVAL;
        }

        return 0;
}

/**
 * sysc_ioremap - ioremap register space for the interconnect target module
 * @ddata: device driver data
 *
 * Note that the interconnect target module registers can be anywhere
 * within the interconnect target module range. For example, SGX has
 * them at offset 0x1fc00 in the 32MB module address space. And cpsw
 * has them at offset 0x1200 in the CPSW_WR child. Usually the
 * the interconnect target module registers are at the beginning of
 * the module range though.
 */
static int sysc_ioremap(struct sysc *ddata)
{
        int size;

        if (ddata->offsets[SYSC_REVISION] < 0 &&
            ddata->offsets[SYSC_SYSCONFIG] < 0 &&
            ddata->offsets[SYSC_SYSSTATUS] < 0) {
                size = ddata->module_size;
        } else {
                size = max3(ddata->offsets[SYSC_REVISION],
                            ddata->offsets[SYSC_SYSCONFIG],
                            ddata->offsets[SYSC_SYSSTATUS]);

                if (size < SZ_1K)
                        size = SZ_1K;

                if ((size + sizeof(u32)) > ddata->module_size)
                        size = ddata->module_size;
        }

        ddata->module_va = devm_ioremap(ddata->dev,
                                        ddata->module_pa,
                                        size + sizeof(u32));
        if (!ddata->module_va)
                return -EIO;

        return 0;
}

/**
 * sysc_map_and_check_registers - ioremap and check device registers
 * @ddata: device driver data
 */
static int sysc_map_and_check_registers(struct sysc *ddata)
{
        struct device_node *np = ddata->dev->of_node;
        int error;

        error = sysc_parse_and_check_child_range(ddata);
        if (error)
                return error;

        error = sysc_defer_non_critical(ddata);
        if (error)
                return error;

        sysc_check_children(ddata);

        if (!of_get_property(np, "reg", NULL))
                return 0;

        error = sysc_parse_registers(ddata);
        if (error)
                return error;

        error = sysc_ioremap(ddata);
        if (error)
                return error;

        error = sysc_check_registers(ddata);
        if (error)
                return error;

        return 0;
}

/**
 * sysc_show_rev - read and show interconnect target module revision
 * @bufp: buffer to print the information to
 * @ddata: device driver data
 */
static int sysc_show_rev(char *bufp, struct sysc *ddata)
{
        int len;

        if (ddata->offsets[SYSC_REVISION] < 0)
                return sprintf(bufp, ":NA");

        len = sprintf(bufp, ":%08x", ddata->revision);

        return len;
}

static int sysc_show_reg(struct sysc *ddata,
                         char *bufp, enum sysc_registers reg)
{
        if (ddata->offsets[reg] < 0)
                return sprintf(bufp, ":NA");

        return sprintf(bufp, ":%x", ddata->offsets[reg]);
}

static int sysc_show_name(char *bufp, struct sysc *ddata)
{
        if (!ddata->name)
                return 0;

        return sprintf(bufp, ":%s", ddata->name);
}

/**
 * sysc_show_registers - show information about interconnect target module
 * @ddata: device driver data
 */
static void sysc_show_registers(struct sysc *ddata)
{
        char buf[128];
        char *bufp = buf;
        int i;

        for (i = 0; i < SYSC_MAX_REGS; i++)
                bufp += sysc_show_reg(ddata, bufp, i);

        bufp += sysc_show_rev(bufp, ddata);
        bufp += sysc_show_name(bufp, ddata);

        dev_dbg(ddata->dev, "%llx:%x%s\n",
                ddata->module_pa, ddata->module_size,
                buf);
}

/**
 * sysc_write_sysconfig - handle sysconfig quirks for register write
 * @ddata: device driver data
 * @value: register value
 */
static void sysc_write_sysconfig(struct sysc *ddata, u32 value)
{
        if (ddata->module_unlock_quirk)
                ddata->module_unlock_quirk(ddata);

        sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], value);

        if (ddata->module_lock_quirk)
                ddata->module_lock_quirk(ddata);
}

#define SYSC_IDLE_MASK  (SYSC_NR_IDLEMODES - 1)
#define SYSC_CLOCACT_ICK        2

/* Caller needs to manage sysc_clkdm_deny_idle() and sysc_clkdm_allow_idle() */
static int sysc_enable_module(struct device *dev)
{
        struct sysc *ddata;
        const struct sysc_regbits *regbits;
        u32 reg, idlemodes, best_mode;
        int error;

        ddata = dev_get_drvdata(dev);

        /*
         * Some modules like DSS reset automatically on idle. Enable optional
         * reset clocks and wait for OCP softreset to complete.
         */
        if (ddata->cfg.quirks & SYSC_QUIRK_OPT_CLKS_IN_RESET) {
                error = sysc_enable_opt_clocks(ddata);
                if (error) {
                        dev_err(ddata->dev,
                                "Optional clocks failed for enable: %i\n",
                                error);
                        return error;
                }
        }
        /*
         * Some modules like i2c and hdq1w have unusable reset status unless
         * the module reset quirk is enabled. Skip status check on enable.
         */
        if (!(ddata->cfg.quirks & SYSC_MODULE_QUIRK_ENA_RESETDONE)) {
                error = sysc_wait_softreset(ddata);
                if (error)
                        dev_warn(ddata->dev, "OCP softreset timed out\n");
        }
        if (ddata->cfg.quirks & SYSC_QUIRK_OPT_CLKS_IN_RESET)
                sysc_disable_opt_clocks(ddata);

        /*
         * Some subsystem private interconnects, like DSS top level module,
         * need only the automatic OCP softreset handling with no sysconfig
         * register bits to configure.
         */
        if (ddata->offsets[SYSC_SYSCONFIG] == -ENODEV)
                return 0;

        regbits = ddata->cap->regbits;
        reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);

        /*
         * Set CLOCKACTIVITY, we only use it for ick. And we only configure it
         * based on the SYSC_QUIRK_USE_CLOCKACT flag, not based on the hardware
         * capabilities. See the old HWMOD_SET_DEFAULT_CLOCKACT flag.
         */
        if (regbits->clkact_shift >= 0 &&
            (ddata->cfg.quirks & SYSC_QUIRK_USE_CLOCKACT))
                reg |= SYSC_CLOCACT_ICK << regbits->clkact_shift;

        /* Set SIDLE mode */
        idlemodes = ddata->cfg.sidlemodes;
        if (!idlemodes || regbits->sidle_shift < 0)
                goto set_midle;

        if (ddata->cfg.quirks & (SYSC_QUIRK_SWSUP_SIDLE |
                                 SYSC_QUIRK_SWSUP_SIDLE_ACT)) {
                best_mode = SYSC_IDLE_NO;
        } else {
                best_mode = fls(ddata->cfg.sidlemodes) - 1;
                if (best_mode > SYSC_IDLE_MASK) {
                        dev_err(dev, "%s: invalid sidlemode\n", __func__);
                        return -EINVAL;
                }

                /* Set WAKEUP */
                if (regbits->enwkup_shift >= 0 &&
                    ddata->cfg.sysc_val & BIT(regbits->enwkup_shift))
                        reg |= BIT(regbits->enwkup_shift);
        }

        reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift);
        reg |= best_mode << regbits->sidle_shift;
        sysc_write_sysconfig(ddata, reg);

set_midle:
        /* Set MIDLE mode */
        idlemodes = ddata->cfg.midlemodes;
        if (!idlemodes || regbits->midle_shift < 0)
                goto set_autoidle;

        best_mode = fls(ddata->cfg.midlemodes) - 1;
        if (best_mode > SYSC_IDLE_MASK) {
                dev_err(dev, "%s: invalid midlemode\n", __func__);
                return -EINVAL;
        }

        if (ddata->cfg.quirks & SYSC_QUIRK_SWSUP_MSTANDBY)
                best_mode = SYSC_IDLE_NO;

        reg &= ~(SYSC_IDLE_MASK << regbits->midle_shift);
        reg |= best_mode << regbits->midle_shift;
        sysc_write_sysconfig(ddata, reg);

set_autoidle:
        /* Autoidle bit must enabled separately if available */
        if (regbits->autoidle_shift >= 0 &&
            ddata->cfg.sysc_val & BIT(regbits->autoidle_shift)) {
                reg |= 1 << regbits->autoidle_shift;
                sysc_write_sysconfig(ddata, reg);
        }

        /* Flush posted write */
        sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);

        if (ddata->module_enable_quirk)
                ddata->module_enable_quirk(ddata);

        return 0;
}

static int sysc_best_idle_mode(u32 idlemodes, u32 *best_mode)
{
        if (idlemodes & BIT(SYSC_IDLE_SMART_WKUP))
                *best_mode = SYSC_IDLE_SMART_WKUP;
        else if (idlemodes & BIT(SYSC_IDLE_SMART))
                *best_mode = SYSC_IDLE_SMART;
        else if (idlemodes & BIT(SYSC_IDLE_FORCE))
                *best_mode = SYSC_IDLE_FORCE;
        else
                return -EINVAL;

        return 0;
}

/* Caller needs to manage sysc_clkdm_deny_idle() and sysc_clkdm_allow_idle() */
static int sysc_disable_module(struct device *dev)
{
        struct sysc *ddata;
        const struct sysc_regbits *regbits;
        u32 reg, idlemodes, best_mode;
        int ret;

        ddata = dev_get_drvdata(dev);
        if (ddata->offsets[SYSC_SYSCONFIG] == -ENODEV)
                return 0;

        if (ddata->module_disable_quirk)
                ddata->module_disable_quirk(ddata);

        regbits = ddata->cap->regbits;
        reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);

        /* Set MIDLE mode */
        idlemodes = ddata->cfg.midlemodes;
        if (!idlemodes || regbits->midle_shift < 0)
                goto set_sidle;

        ret = sysc_best_idle_mode(idlemodes, &best_mode);
        if (ret) {
                dev_err(dev, "%s: invalid midlemode\n", __func__);
                return ret;
        }

        if (ddata->cfg.quirks & (SYSC_QUIRK_SWSUP_MSTANDBY) ||
            ddata->cfg.quirks & (SYSC_QUIRK_FORCE_MSTANDBY))
                best_mode = SYSC_IDLE_FORCE;

        reg &= ~(SYSC_IDLE_MASK << regbits->midle_shift);
        reg |= best_mode << regbits->midle_shift;
        sysc_write_sysconfig(ddata, reg);

set_sidle:
        /* Set SIDLE mode */
        idlemodes = ddata->cfg.sidlemodes;
        if (!idlemodes || regbits->sidle_shift < 0)
                return 0;

        if (ddata->cfg.quirks & SYSC_QUIRK_SWSUP_SIDLE) {
                best_mode = SYSC_IDLE_FORCE;
        } else {
                ret = sysc_best_idle_mode(idlemodes, &best_mode);
                if (ret) {
                        dev_err(dev, "%s: invalid sidlemode\n", __func__);
                        return ret;
                }
        }

        reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift);
        reg |= best_mode << regbits->sidle_shift;
        if (regbits->autoidle_shift >= 0 &&
            ddata->cfg.sysc_val & BIT(regbits->autoidle_shift))
                reg |= 1 << regbits->autoidle_shift;
        sysc_write_sysconfig(ddata, reg);

        /* Flush posted write */
        sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);

        return 0;
}

static int __maybe_unused sysc_runtime_suspend_legacy(struct device *dev,
                                                      struct sysc *ddata)
{
        struct ti_sysc_platform_data *pdata;
        int error;

        pdata = dev_get_platdata(ddata->dev);
        if (!pdata)
                return 0;

        if (!pdata->idle_module)
                return -ENODEV;

        error = pdata->idle_module(dev, &ddata->cookie);
        if (error)
                dev_err(dev, "%s: could not idle: %i\n",
                        __func__, error);

        reset_control_assert(ddata->rsts);

        return 0;
}

static int __maybe_unused sysc_runtime_resume_legacy(struct device *dev,
                                                     struct sysc *ddata)
{
        struct ti_sysc_platform_data *pdata;
        int error;

        pdata = dev_get_platdata(ddata->dev);
        if (!pdata)
                return 0;

        if (!pdata->enable_module)
                return -ENODEV;

        error = pdata->enable_module(dev, &ddata->cookie);
        if (error)
                dev_err(dev, "%s: could not enable: %i\n",
                        __func__, error);

        reset_control_deassert(ddata->rsts);

        return 0;
}

static int __maybe_unused sysc_runtime_suspend(struct device *dev)
{
        struct sysc *ddata;
        int error = 0;

        ddata = dev_get_drvdata(dev);

        if (!ddata->enabled)
                return 0;

        sysc_clkdm_deny_idle(ddata);

        if (ddata->legacy_mode) {
                error = sysc_runtime_suspend_legacy(dev, ddata);
                if (error)
                        goto err_allow_idle;
        } else {
                error = sysc_disable_module(dev);
                if (error)
                        goto err_allow_idle;
        }

        sysc_disable_main_clocks(ddata);

        if (sysc_opt_clks_needed(ddata))
                sysc_disable_opt_clocks(ddata);

        ddata->enabled = false;

err_allow_idle:
        sysc_clkdm_allow_idle(ddata);

        reset_control_assert(ddata->rsts);

        return error;
}

static int __maybe_unused sysc_runtime_resume(struct device *dev)
{
        struct sysc *ddata;
        int error = 0;

        ddata = dev_get_drvdata(dev);

        if (ddata->enabled)
                return 0;


        sysc_clkdm_deny_idle(ddata);

        if (sysc_opt_clks_needed(ddata)) {
                error = sysc_enable_opt_clocks(ddata);
                if (error)
                        goto err_allow_idle;
        }

        error = sysc_enable_main_clocks(ddata);
        if (error)
                goto err_opt_clocks;

        reset_control_deassert(ddata->rsts);

        if (ddata->legacy_mode) {
                error = sysc_runtime_resume_legacy(dev, ddata);
                if (error)
                        goto err_main_clocks;
        } else {
                error = sysc_enable_module(dev);
                if (error)
                        goto err_main_clocks;
        }

        ddata->enabled = true;

        sysc_clkdm_allow_idle(ddata);

        return 0;

err_main_clocks:
        sysc_disable_main_clocks(ddata);
err_opt_clocks:
        if (sysc_opt_clks_needed(ddata))
                sysc_disable_opt_clocks(ddata);
err_allow_idle:
        sysc_clkdm_allow_idle(ddata);

        return error;
}

static int sysc_reinit_module(struct sysc *ddata, bool leave_enabled)
{
        struct device *dev = ddata->dev;
        int error;

        /* Disable target module if it is enabled */
        if (ddata->enabled) {
                error = sysc_runtime_suspend(dev);
                if (error)
                        dev_warn(dev, "reinit suspend failed: %i\n", error);
        }

        /* Enable target module */
        error = sysc_runtime_resume(dev);
        if (error)
                dev_warn(dev, "reinit resume failed: %i\n", error);

        if (leave_enabled)
                return error;

        /* Disable target module if no leave_enabled was set */
        error = sysc_runtime_suspend(dev);
        if (error)
                dev_warn(dev, "reinit suspend failed: %i\n", error);

        return error;
}

static int __maybe_unused sysc_noirq_suspend(struct device *dev)
{
        struct sysc *ddata;

        ddata = dev_get_drvdata(dev);

        if (ddata->cfg.quirks &
            (SYSC_QUIRK_LEGACY_IDLE | SYSC_QUIRK_NO_IDLE))
                return 0;

        if (!ddata->enabled)
                return 0;

        ddata->needs_resume = 1;

        return sysc_runtime_suspend(dev);
}

static int __maybe_unused sysc_noirq_resume(struct device *dev)
{
        struct sysc *ddata;
        int error = 0;

        ddata = dev_get_drvdata(dev);

        if (ddata->cfg.quirks &
            (SYSC_QUIRK_LEGACY_IDLE | SYSC_QUIRK_NO_IDLE))
                return 0;

        if (ddata->cfg.quirks & SYSC_QUIRK_REINIT_ON_RESUME) {
                error = sysc_reinit_module(ddata, ddata->needs_resume);
                if (error)
                        dev_warn(dev, "noirq_resume failed: %i\n", error);
        } else if (ddata->needs_resume) {
                error = sysc_runtime_resume(dev);
                if (error)
                        dev_warn(dev, "noirq_resume failed: %i\n", error);
        }

        ddata->needs_resume = 0;

        return error;
}

static const struct dev_pm_ops sysc_pm_ops = {
        SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_noirq_suspend, sysc_noirq_resume)
        SET_RUNTIME_PM_OPS(sysc_runtime_suspend,
                           sysc_runtime_resume,
                           NULL)
};

/* Module revision register based quirks */
struct sysc_revision_quirk {
        const char *name;
        u32 base;
        int rev_offset;
        int sysc_offset;
        int syss_offset;
        u32 revision;
        u32 revision_mask;
        u32 quirks;
};

#define SYSC_QUIRK(optname, optbase, optrev, optsysc, optsyss,          \
                   optrev_val, optrevmask, optquirkmask)                \
        {                                                               \
                .name = (optname),                                      \
                .base = (optbase),                                      \
                .rev_offset = (optrev),                                 \
                .sysc_offset = (optsysc),                               \
                .syss_offset = (optsyss),                               \
                .revision = (optrev_val),                               \
                .revision_mask = (optrevmask),                          \
                .quirks = (optquirkmask),                               \
        }

static const struct sysc_revision_quirk sysc_revision_quirks[] = {
        /* These drivers need to be fixed to not use pm_runtime_irq_safe() */
        SYSC_QUIRK("gpio", 0, 0, 0x10, 0x114, 0x50600801, 0xffff00ff,
                   SYSC_QUIRK_LEGACY_IDLE | SYSC_QUIRK_OPT_CLKS_IN_RESET),
        SYSC_QUIRK("sham", 0, 0x100, 0x110, 0x114, 0x40000c03, 0xffffffff,
                   SYSC_QUIRK_LEGACY_IDLE),
        SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000046, 0xffffffff,
                   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
        SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff,
                   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
        /* Uarts on omap4 and later */
        SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x50411e03, 0xffff00ff,
                   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
        SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x47422e03, 0xffffffff,
                   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),

        /* Quirks that need to be set based on the module address */
        SYSC_QUIRK("mcpdm", 0x40132000, 0, 0x10, -ENODEV, 0x50000800, 0xffffffff,
                   SYSC_QUIRK_EXT_OPT_CLOCK | SYSC_QUIRK_NO_RESET_ON_INIT |
                   SYSC_QUIRK_SWSUP_SIDLE),

        /* Quirks that need to be set based on detected module */
        SYSC_QUIRK("aess", 0, 0, 0x10, -ENODEV, 0x40000000, 0xffffffff,
                   SYSC_MODULE_QUIRK_AESS),
        /* Errata i893 handling for dra7 dcan1 and 2 */
        SYSC_QUIRK("dcan", 0x4ae3c000, 0x20, -ENODEV, -ENODEV, 0xa3170504, 0xffffffff,
                   SYSC_QUIRK_CLKDM_NOAUTO),
        SYSC_QUIRK("dcan", 0x48480000, 0x20, -ENODEV, -ENODEV, 0xa3170504, 0xffffffff,
                   SYSC_QUIRK_CLKDM_NOAUTO),
        SYSC_QUIRK("dss", 0x4832a000, 0, 0x10, 0x14, 0x00000020, 0xffffffff,
                   SYSC_QUIRK_OPT_CLKS_IN_RESET | SYSC_MODULE_QUIRK_DSS_RESET),
        SYSC_QUIRK("dss", 0x58000000, 0, -ENODEV, 0x14, 0x00000040, 0xffffffff,
                   SYSC_QUIRK_OPT_CLKS_IN_RESET | SYSC_MODULE_QUIRK_DSS_RESET),
        SYSC_QUIRK("dss", 0x58000000, 0, -ENODEV, 0x14, 0x00000061, 0xffffffff,
                   SYSC_QUIRK_OPT_CLKS_IN_RESET | SYSC_MODULE_QUIRK_DSS_RESET),
        SYSC_QUIRK("dwc3", 0x48880000, 0, 0x10, -ENODEV, 0x500a0200, 0xffffffff,
                   SYSC_QUIRK_CLKDM_NOAUTO),
        SYSC_QUIRK("dwc3", 0x488c0000, 0, 0x10, -ENODEV, 0x500a0200, 0xffffffff,
                   SYSC_QUIRK_CLKDM_NOAUTO),
        SYSC_QUIRK("gpmc", 0, 0, 0x10, 0x14, 0x00000060, 0xffffffff,
                   SYSC_QUIRK_GPMC_DEBUG),
        SYSC_QUIRK("hdmi", 0, 0, 0x10, -ENODEV, 0x50030200, 0xffffffff,
                   SYSC_QUIRK_OPT_CLKS_NEEDED),
        SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x00000006, 0xffffffff,
                   SYSC_MODULE_QUIRK_HDQ1W | SYSC_MODULE_QUIRK_ENA_RESETDONE),
        SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x0000000a, 0xffffffff,
                   SYSC_MODULE_QUIRK_HDQ1W | SYSC_MODULE_QUIRK_ENA_RESETDONE),
        SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x00000036, 0x000000ff,
                   SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE),
        SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x0000003c, 0x000000ff,
                   SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE),
        SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x00000040, 0x000000ff,
                   SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE),
        SYSC_QUIRK("i2c", 0, 0, 0x10, 0x90, 0x5040000a, 0xfffff0f0,
                   SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE),
        SYSC_QUIRK("gpu", 0x50000000, 0x14, -ENODEV, -ENODEV, 0x00010201, 0xffffffff, 0),
        SYSC_QUIRK("gpu", 0x50000000, 0xfe00, 0xfe10, -ENODEV, 0x40000000 , 0xffffffff,
                   SYSC_MODULE_QUIRK_SGX),
        SYSC_QUIRK("lcdc", 0, 0, 0x54, -ENODEV, 0x4f201000, 0xffffffff,
                   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY),
        SYSC_QUIRK("mcasp", 0, 0, 0x4, -ENODEV, 0x44306302, 0xffffffff,
                   SYSC_QUIRK_SWSUP_SIDLE),
        SYSC_QUIRK("rtc", 0, 0x74, 0x78, -ENODEV, 0x4eb01908, 0xffff00f0,
                   SYSC_MODULE_QUIRK_RTC_UNLOCK),
        SYSC_QUIRK("tptc", 0, 0, 0x10, -ENODEV, 0x40006c00, 0xffffefff,
                   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY),
        SYSC_QUIRK("tptc", 0, 0, -ENODEV, -ENODEV, 0x40007c00, 0xffffffff,
                   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY),
        SYSC_QUIRK("sata", 0, 0xfc, 0x1100, -ENODEV, 0x5e412000, 0xffffffff,
                   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY),
        SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, 0x14, 0x50700100, 0xffffffff,
                   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY),
        SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, -ENODEV, 0x50700101, 0xffffffff,
                   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY),
        SYSC_QUIRK("usb_otg_hs", 0, 0x400, 0x404, 0x408, 0x00000050,
                   0xffffffff, SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY),
        SYSC_QUIRK("usb_otg_hs", 0, 0, 0x10, -ENODEV, 0x4ea2080d, 0xffffffff,
                   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY |
                   SYSC_QUIRK_REINIT_ON_RESUME),
        SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0500, 0xfffff0f0,
                   SYSC_MODULE_QUIRK_WDT),
        /* PRUSS on am3, am4 and am5 */
        SYSC_QUIRK("pruss", 0, 0x26000, 0x26004, -ENODEV, 0x47000000, 0xff000000,
                   SYSC_MODULE_QUIRK_PRUSS),
        /* Watchdog on am3 and am4 */
        SYSC_QUIRK("wdt", 0x44e35000, 0, 0x10, 0x14, 0x502a0500, 0xfffff0f0,
                   SYSC_MODULE_QUIRK_WDT | SYSC_QUIRK_SWSUP_SIDLE),

#ifdef DEBUG
        SYSC_QUIRK("adc", 0, 0, 0x10, -ENODEV, 0x47300001, 0xffffffff, 0),
        SYSC_QUIRK("atl", 0, 0, -ENODEV, -ENODEV, 0x0a070100, 0xffffffff, 0),
        SYSC_QUIRK("cm", 0, 0, -ENODEV, -ENODEV, 0x40000301, 0xffffffff, 0),
        SYSC_QUIRK("control", 0, 0, 0x10, -ENODEV, 0x40000900, 0xffffffff, 0),
        SYSC_QUIRK("cpgmac", 0, 0x1200, 0x1208, 0x1204, 0x4edb1902,
                   0xffff00f0, 0),
        SYSC_QUIRK("dcan", 0, 0x20, -ENODEV, -ENODEV, 0xa3170504, 0xffffffff, 0),
        SYSC_QUIRK("dcan", 0, 0x20, -ENODEV, -ENODEV, 0x4edb1902, 0xffffffff, 0),
        SYSC_QUIRK("dispc", 0x4832a400, 0, 0x10, 0x14, 0x00000030, 0xffffffff, 0),
        SYSC_QUIRK("dispc", 0x58001000, 0, 0x10, 0x14, 0x00000040, 0xffffffff, 0),
        SYSC_QUIRK("dispc", 0x58001000, 0, 0x10, 0x14, 0x00000051, 0xffffffff, 0),
        SYSC_QUIRK("dmic", 0, 0, 0x10, -ENODEV, 0x50010000, 0xffffffff, 0),
        SYSC_QUIRK("dsi", 0x58004000, 0, 0x10, 0x14, 0x00000030, 0xffffffff, 0),
        SYSC_QUIRK("dsi", 0x58005000, 0, 0x10, 0x14, 0x00000030, 0xffffffff, 0),
        SYSC_QUIRK("dsi", 0x58005000, 0, 0x10, 0x14, 0x00000040, 0xffffffff, 0),
        SYSC_QUIRK("dsi", 0x58009000, 0, 0x10, 0x14, 0x00000040, 0xffffffff, 0),
        SYSC_QUIRK("dwc3", 0, 0, 0x10, -ENODEV, 0x500a0200, 0xffffffff, 0),
        SYSC_QUIRK("d2d", 0x4a0b6000, 0, 0x10, 0x14, 0x00000010, 0xffffffff, 0),
        SYSC_QUIRK("d2d", 0x4a0cd000, 0, 0x10, 0x14, 0x00000010, 0xffffffff, 0),
        SYSC_QUIRK("elm", 0x48080000, 0, 0x10, 0x14, 0x00000020, 0xffffffff, 0),
        SYSC_QUIRK("emif", 0, 0, -ENODEV, -ENODEV, 0x40441403, 0xffff0fff, 0),
        SYSC_QUIRK("emif", 0, 0, -ENODEV, -ENODEV, 0x50440500, 0xffffffff, 0),
        SYSC_QUIRK("epwmss", 0, 0, 0x4, -ENODEV, 0x47400001, 0xffffffff, 0),
        SYSC_QUIRK("gpu", 0, 0x1fc00, 0x1fc10, -ENODEV, 0, 0, 0),
        SYSC_QUIRK("gpu", 0, 0xfe00, 0xfe10, -ENODEV, 0x40000000 , 0xffffffff, 0),
        SYSC_QUIRK("hdmi", 0, 0, 0x10, -ENODEV, 0x50031d00, 0xffffffff, 0),
        SYSC_QUIRK("hsi", 0, 0, 0x10, 0x14, 0x50043101, 0xffffffff, 0),
        SYSC_QUIRK("iss", 0, 0, 0x10, -ENODEV, 0x40000101, 0xffffffff, 0),
        SYSC_QUIRK("keypad", 0x4a31c000, 0, 0x10, 0x14, 0x00000020, 0xffffffff, 0),
        SYSC_QUIRK("mcasp", 0, 0, 0x4, -ENODEV, 0x44307b02, 0xffffffff, 0),
        SYSC_QUIRK("mcbsp", 0, -ENODEV, 0x8c, -ENODEV, 0, 0, 0),
        SYSC_QUIRK("mcspi", 0, 0, 0x10, -ENODEV, 0x40300a0b, 0xffff00ff, 0),
        SYSC_QUIRK("mcspi", 0, 0, 0x110, 0x114, 0x40300a0b, 0xffffffff, 0),
        SYSC_QUIRK("mailbox", 0, 0, 0x10, -ENODEV, 0x00000400, 0xffffffff, 0),
        SYSC_QUIRK("m3", 0, 0, -ENODEV, -ENODEV, 0x5f580105, 0x0fff0f00, 0),
        SYSC_QUIRK("ocp2scp", 0, 0, 0x10, 0x14, 0x50060005, 0xfffffff0, 0),
        SYSC_QUIRK("ocp2scp", 0, 0, -ENODEV, -ENODEV, 0x50060007, 0xffffffff, 0),
        SYSC_QUIRK("padconf", 0, 0, 0x10, -ENODEV, 0x4fff0800, 0xffffffff, 0),
        SYSC_QUIRK("padconf", 0, 0, -ENODEV, -ENODEV, 0x40001100, 0xffffffff, 0),
        SYSC_QUIRK("pcie", 0x51000000, -ENODEV, -ENODEV, -ENODEV, 0, 0, 0),
        SYSC_QUIRK("pcie", 0x51800000, -ENODEV, -ENODEV, -ENODEV, 0, 0, 0),
        SYSC_QUIRK("prcm", 0, 0, -ENODEV, -ENODEV, 0x40000100, 0xffffffff, 0),
        SYSC_QUIRK("prcm", 0, 0, -ENODEV, -ENODEV, 0x00004102, 0xffffffff, 0),
        SYSC_QUIRK("prcm", 0, 0, -ENODEV, -ENODEV, 0x40000400, 0xffffffff, 0),
        SYSC_QUIRK("rfbi", 0x4832a800, 0, 0x10, 0x14, 0x00000010, 0xffffffff, 0),
        SYSC_QUIRK("rfbi", 0x58002000, 0, 0x10, 0x14, 0x00000010, 0xffffffff, 0),
        SYSC_QUIRK("scm", 0, 0, 0x10, -ENODEV, 0x40000900, 0xffffffff, 0),
        SYSC_QUIRK("scm", 0, 0, -ENODEV, -ENODEV, 0x4e8b0100, 0xffffffff, 0),
        SYSC_QUIRK("scm", 0, 0, -ENODEV, -ENODEV, 0x4f000100, 0xffffffff, 0),
        SYSC_QUIRK("scm", 0, 0, -ENODEV, -ENODEV, 0x40000900, 0xffffffff, 0),
        SYSC_QUIRK("scrm", 0, 0, -ENODEV, -ENODEV, 0x00000010, 0xffffffff, 0),
        SYSC_QUIRK("sdio", 0, 0, 0x10, -ENODEV, 0x40202301, 0xffff0ff0, 0),
        SYSC_QUIRK("sdio", 0, 0x2fc, 0x110, 0x114, 0x31010000, 0xffffffff, 0),
        SYSC_QUIRK("sdma", 0, 0, 0x2c, 0x28, 0x00010900, 0xffffffff, 0),
        SYSC_QUIRK("slimbus", 0, 0, 0x10, -ENODEV, 0x40000902, 0xffffffff, 0),
        SYSC_QUIRK("slimbus", 0, 0, 0x10, -ENODEV, 0x40002903, 0xffffffff, 0),
        SYSC_QUIRK("smartreflex", 0, -ENODEV, 0x24, -ENODEV, 0x00000000, 0xffffffff, 0),
        SYSC_QUIRK("smartreflex", 0, -ENODEV, 0x38, -ENODEV, 0x00000000, 0xffffffff, 0),
        SYSC_QUIRK("spinlock", 0, 0, 0x10, -ENODEV, 0x50020000, 0xffffffff, 0),
        SYSC_QUIRK("rng", 0, 0x1fe0, 0x1fe4, -ENODEV, 0x00000020, 0xffffffff, 0),
        SYSC_QUIRK("timer", 0, 0, 0x10, 0x14, 0x00000013, 0xffffffff, 0),
        SYSC_QUIRK("timer", 0, 0, 0x10, 0x14, 0x00000015, 0xffffffff, 0),
        /* Some timers on omap4 and later */
        SYSC_QUIRK("timer", 0, 0, 0x10, -ENODEV, 0x50002100, 0xffffffff, 0),
        SYSC_QUIRK("timer", 0, 0, 0x10, -ENODEV, 0x4fff1301, 0xffff00ff, 0),
        SYSC_QUIRK("timer32k", 0, 0, 0x4, -ENODEV, 0x00000040, 0xffffffff, 0),
        SYSC_QUIRK("timer32k", 0, 0, 0x4, -ENODEV, 0x00000011, 0xffffffff, 0),
        SYSC_QUIRK("timer32k", 0, 0, 0x4, -ENODEV, 0x00000060, 0xffffffff, 0),
        SYSC_QUIRK("tpcc", 0, 0, -ENODEV, -ENODEV, 0x40014c00, 0xffffffff, 0),
        SYSC_QUIRK("usbhstll", 0, 0, 0x10, 0x14, 0x00000004, 0xffffffff, 0),
        SYSC_QUIRK("usbhstll", 0, 0, 0x10, 0x14, 0x00000008, 0xffffffff, 0),
        SYSC_QUIRK("venc", 0x58003000, 0, -ENODEV, -ENODEV, 0x00000002, 0xffffffff, 0),
        SYSC_QUIRK("vfpe", 0, 0, 0x104, -ENODEV, 0x4d001200, 0xffffffff, 0),
#endif
};

/*
 * Early quirks based on module base and register offsets only that are
 * needed before the module revision can be read
 */
static void sysc_init_early_quirks(struct sysc *ddata)
{
        const struct sysc_revision_quirk *q;
        int i;

        for (i = 0; i < ARRAY_SIZE(sysc_revision_quirks); i++) {
                q = &sysc_revision_quirks[i];

                if (!q->base)
                        continue;

                if (q->base != ddata->module_pa)
                        continue;

                if (q->rev_offset != ddata->offsets[SYSC_REVISION])
                        continue;

                if (q->sysc_offset != ddata->offsets[SYSC_SYSCONFIG])
                        continue;

                if (q->syss_offset != ddata->offsets[SYSC_SYSSTATUS])
                        continue;

                ddata->name = q->name;
                ddata->cfg.quirks |= q->quirks;
        }
}

/* Quirks that also consider the revision register value */
static void sysc_init_revision_quirks(struct sysc *ddata)
{
        const struct sysc_revision_quirk *q;
        int i;

        for (i = 0; i < ARRAY_SIZE(sysc_revision_quirks); i++) {
                q = &sysc_revision_quirks[i];

                if (q->base && q->base != ddata->module_pa)
                        continue;

                if (q->rev_offset != ddata->offsets[SYSC_REVISION])
                        continue;

                if (q->sysc_offset != ddata->offsets[SYSC_SYSCONFIG])
                        continue;

                if (q->syss_offset != ddata->offsets[SYSC_SYSSTATUS])
                        continue;

                if (q->revision == ddata->revision ||
                    (q->revision & q->revision_mask) ==
                    (ddata->revision & q->revision_mask)) {
                        ddata->name = q->name;
                        ddata->cfg.quirks |= q->quirks;
                }
        }
}

/*
 * DSS needs dispc outputs disabled to reset modules. Returns mask of
 * enabled DSS interrupts. Eventually we may be able to do this on
 * dispc init rather than top-level DSS init.
 */
static u32 sysc_quirk_dispc(struct sysc *ddata, int dispc_offset,
                            bool disable)
{
        bool lcd_en, digit_en, lcd2_en = false, lcd3_en = false;
        const int lcd_en_mask = BIT(0), digit_en_mask = BIT(1);
        int manager_count;
        bool framedonetv_irq = true;
        u32 val, irq_mask = 0;

        switch (sysc_soc->soc) {
        case SOC_2420 ... SOC_3630:
                manager_count = 2;
                framedonetv_irq = false;
                break;
        case SOC_4430 ... SOC_4470:
                manager_count = 3;
                break;
        case SOC_5430:
        case SOC_DRA7:
                manager_count = 4;
                break;
        case SOC_AM4:
                manager_count = 1;
                framedonetv_irq = false;
                break;
        case SOC_UNKNOWN:
        default:
                return 0;
        }

        /* Remap the whole module range to be able to reset dispc outputs */
        devm_iounmap(ddata->dev, ddata->module_va);
        ddata->module_va = devm_ioremap(ddata->dev,
                                        ddata->module_pa,
                                        ddata->module_size);
        if (!ddata->module_va)
                return -EIO;

        /* DISP_CONTROL */
        val = sysc_read(ddata, dispc_offset + 0x40);
        lcd_en = val & lcd_en_mask;
        digit_en = val & digit_en_mask;
        if (lcd_en)
                irq_mask |= BIT(0);                     /* FRAMEDONE */
        if (digit_en) {
                if (framedonetv_irq)
                        irq_mask |= BIT(24);            /* FRAMEDONETV */
                else
                        irq_mask |= BIT(2) | BIT(3);    /* EVSYNC bits */
        }
        if (disable & (lcd_en | digit_en))
                sysc_write(ddata, dispc_offset + 0x40,
                           val & ~(lcd_en_mask | digit_en_mask));

        if (manager_count <= 2)
                return irq_mask;

        /* DISPC_CONTROL2 */
        val = sysc_read(ddata, dispc_offset + 0x238);
        lcd2_en = val & lcd_en_mask;
        if (lcd2_en)
                irq_mask |= BIT(22);                    /* FRAMEDONE2 */
        if (disable && lcd2_en)
                sysc_write(ddata, dispc_offset + 0x238,
                           val & ~lcd_en_mask);

        if (manager_count <= 3)
                return irq_mask;

        /* DISPC_CONTROL3 */
        val = sysc_read(ddata, dispc_offset + 0x848);
        lcd3_en = val & lcd_en_mask;
        if (lcd3_en)
                irq_mask |= BIT(30);                    /* FRAMEDONE3 */
        if (disable && lcd3_en)
                sysc_write(ddata, dispc_offset + 0x848,
                           val & ~lcd_en_mask);

        return irq_mask;
}

/* DSS needs child outputs disabled and SDI registers cleared for reset */
static void sysc_pre_reset_quirk_dss(struct sysc *ddata)
{
        const int dispc_offset = 0x1000;
        int error;
        u32 irq_mask, val;

        /* Get enabled outputs */
        irq_mask = sysc_quirk_dispc(ddata, dispc_offset, false);
        if (!irq_mask)
                return;

        /* Clear IRQSTATUS */
        sysc_write(ddata, dispc_offset + 0x18, irq_mask);

        /* Disable outputs */
        val = sysc_quirk_dispc(ddata, dispc_offset, true);

        /* Poll IRQSTATUS */
        error = readl_poll_timeout(ddata->module_va + dispc_offset + 0x18,
                                   val, val != irq_mask, 100, 50);
        if (error)
                dev_warn(ddata->dev, "%s: timed out %08x !+ %08x\n",
                         __func__, val, irq_mask);

        if (sysc_soc->soc == SOC_3430) {
                /* Clear DSS_SDI_CONTROL */
                sysc_write(ddata, 0x44, 0);

                /* Clear DSS_PLL_CONTROL */
                sysc_write(ddata, 0x48, 0);
        }

        /* Clear DSS_CONTROL to switch DSS clock sources to PRCM if not */
        sysc_write(ddata, 0x40, 0);
}

/* 1-wire needs module's internal clocks enabled for reset */
static void sysc_pre_reset_quirk_hdq1w(struct sysc *ddata)
{
        int offset = 0x0c;      /* HDQ_CTRL_STATUS */
        u16 val;

        val = sysc_read(ddata, offset);
        val |= BIT(5);
        sysc_write(ddata, offset, val);
}

/* AESS (Audio Engine SubSystem) needs autogating set after enable */
static void sysc_module_enable_quirk_aess(struct sysc *ddata)
{
        int offset = 0x7c;      /* AESS_AUTO_GATING_ENABLE */

        sysc_write(ddata, offset, 1);
}

/* I2C needs to be disabled for reset */
static void sysc_clk_quirk_i2c(struct sysc *ddata, bool enable)
{
        int offset;
        u16 val;

        /* I2C_CON, omap2/3 is different from omap4 and later */
        if ((ddata->revision & 0xffffff00) == 0x001f0000)
                offset = 0x24;
        else
                offset = 0xa4;

        /* I2C_EN */
        val = sysc_read(ddata, offset);
        if (enable)
                val |= BIT(15);
        else
                val &= ~BIT(15);
        sysc_write(ddata, offset, val);
}

static void sysc_pre_reset_quirk_i2c(struct sysc *ddata)
{
        sysc_clk_quirk_i2c(ddata, false);
}

static void sysc_post_reset_quirk_i2c(struct sysc *ddata)
{
        sysc_clk_quirk_i2c(ddata, true);
}

/* RTC on am3 and 4 needs to be unlocked and locked for sysconfig */
static void sysc_quirk_rtc(struct sysc *ddata, bool lock)
{
        u32 val, kick0_val = 0, kick1_val = 0;
        unsigned long flags;
        int error;

        if (!lock) {
                kick0_val = 0x83e70b13;
                kick1_val = 0x95a4f1e0;
        }

        local_irq_save(flags);
        /* RTC_STATUS BUSY bit may stay active for 1/32768 seconds (~30 usec) */
        error = readl_poll_timeout_atomic(ddata->module_va + 0x44, val,
                                          !(val & BIT(0)), 100, 50);
        if (error)
                dev_warn(ddata->dev, "rtc busy timeout\n");
        /* Now we have ~15 microseconds to read/write various registers */
        sysc_write(ddata, 0x6c, kick0_val);
        sysc_write(ddata, 0x70, kick1_val);
        local_irq_restore(flags);
}

static void sysc_module_unlock_quirk_rtc(struct sysc *ddata)
{
        sysc_quirk_rtc(ddata, false);
}

static void sysc_module_lock_quirk_rtc(struct sysc *ddata)
{
        sysc_quirk_rtc(ddata, true);
}

/* 36xx SGX needs a quirk for to bypass OCP IPG interrupt logic */
static void sysc_module_enable_quirk_sgx(struct sysc *ddata)
{
        int offset = 0xff08;    /* OCP_DEBUG_CONFIG */
        u32 val = BIT(31);      /* THALIA_INT_BYPASS */

        sysc_write(ddata, offset, val);
}

/* Watchdog timer needs a disable sequence after reset */
static void sysc_reset_done_quirk_wdt(struct sysc *ddata)
{
        int wps, spr, error;
        u32 val;

        wps = 0x34;
        spr = 0x48;

        sysc_write(ddata, spr, 0xaaaa);
        error = readl_poll_timeout(ddata->module_va + wps, val,
                                   !(val & 0x10), 100,
                                   MAX_MODULE_SOFTRESET_WAIT);
        if (error)
                dev_warn(ddata->dev, "wdt disable step1 failed\n");

        sysc_write(ddata, spr, 0x5555);
        error = readl_poll_timeout(ddata->module_va + wps, val,
                                   !(val & 0x10), 100,
                                   MAX_MODULE_SOFTRESET_WAIT);
        if (error)
                dev_warn(ddata->dev, "wdt disable step2 failed\n");
}

/* PRUSS needs to set MSTANDBY_INIT inorder to idle properly */
static void sysc_module_disable_quirk_pruss(struct sysc *ddata)
{
        u32 reg;

        reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
        reg |= SYSC_PRUSS_STANDBY_INIT;
        sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
}

static void sysc_init_module_quirks(struct sysc *ddata)
{
        if (ddata->legacy_mode || !ddata->name)
                return;

        if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_HDQ1W) {
                ddata->pre_reset_quirk = sysc_pre_reset_quirk_hdq1w;

                return;
        }

#ifdef CONFIG_OMAP_GPMC_DEBUG
        if (ddata->cfg.quirks & SYSC_QUIRK_GPMC_DEBUG) {
                ddata->cfg.quirks |= SYSC_QUIRK_NO_RESET_ON_INIT;

                return;
        }
#endif

        if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_I2C) {
                ddata->pre_reset_quirk = sysc_pre_reset_quirk_i2c;
                ddata->post_reset_quirk = sysc_post_reset_quirk_i2c;

                return;
        }

        if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_AESS)
                ddata->module_enable_quirk = sysc_module_enable_quirk_aess;

        if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_DSS_RESET)
                ddata->pre_reset_quirk = sysc_pre_reset_quirk_dss;

        if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_RTC_UNLOCK) {
                ddata->module_unlock_quirk = sysc_module_unlock_quirk_rtc;
                ddata->module_lock_quirk = sysc_module_lock_quirk_rtc;

                return;
        }

        if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_SGX)
                ddata->module_enable_quirk = sysc_module_enable_quirk_sgx;

        if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_WDT) {
                ddata->reset_done_quirk = sysc_reset_done_quirk_wdt;
                ddata->module_disable_quirk = sysc_reset_done_quirk_wdt;
        }

        if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_PRUSS)
                ddata->module_disable_quirk = sysc_module_disable_quirk_pruss;
}

static int sysc_clockdomain_init(struct sysc *ddata)
{
        struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
        struct clk *fck = NULL, *ick = NULL;
        int error;

        if (!pdata || !pdata->init_clockdomain)
                return 0;

        switch (ddata->nr_clocks) {
        case 2:
                ick = ddata->clocks[SYSC_ICK];
                fallthrough;
        case 1:
                fck = ddata->clocks[SYSC_FCK];
                break;
        case 0:
                return 0;
        }

        error = pdata->init_clockdomain(ddata->dev, fck, ick, &ddata->cookie);
        if (!error || error == -ENODEV)
                return 0;

        return error;
}

/*
 * Note that pdata->init_module() typically does a reset first. After
 * pdata->init_module() is done, PM runtime can be used for the interconnect

 * target module.
 */
static int sysc_legacy_init(struct sysc *ddata)
{
        struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
        int error;

        if (!pdata || !pdata->init_module)
                return 0;

        error = pdata->init_module(ddata->dev, ddata->mdata, &ddata->cookie);
        if (error == -EEXIST)
                error = 0;

        return error;
}

/*
 * Note that the caller must ensure the interconnect target module is enabled
 * before calling reset. Otherwise reset will not complete.
 */
static int sysc_reset(struct sysc *ddata)
{
        int sysc_offset, sysc_val, error;
        u32 sysc_mask;

        sysc_offset = ddata->offsets[SYSC_SYSCONFIG];

        if (ddata->legacy_mode ||
            ddata->cap->regbits->srst_shift < 0 ||
            ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
                return 0;

        sysc_mask = BIT(ddata->cap->regbits->srst_shift);

        if (ddata->pre_reset_quirk)
                ddata->pre_reset_quirk(ddata);

        if (sysc_offset >= 0) {
                sysc_val = sysc_read_sysconfig(ddata);
                sysc_val |= sysc_mask;
                sysc_write(ddata, sysc_offset, sysc_val);
        }

        if (ddata->cfg.srst_udelay)
                usleep_range(ddata->cfg.srst_udelay,
                             ddata->cfg.srst_udelay * 2);

        if (ddata->post_reset_quirk)
                ddata->post_reset_quirk(ddata);

        error = sysc_wait_softreset(ddata);
        if (error)
                dev_warn(ddata->dev, "OCP softreset timed out\n");

        if (ddata->reset_done_quirk)
                ddata->reset_done_quirk(ddata);

        return error;
}

/*
 * At this point the module is configured enough to read the revision but
 * module may not be completely configured yet to use PM runtime. Enable
 * all clocks directly during init to configure the quirks needed for PM
 * runtime based on the revision register.
 */
static int sysc_init_module(struct sysc *ddata)
{
        bool rstctrl_deasserted = false;
        int error = 0;

        error = sysc_clockdomain_init(ddata);
        if (error)
                return error;

        sysc_clkdm_deny_idle(ddata);

        /*
         * Always enable clocks. The bootloader may or may not have enabled
         * the related clocks.
         */
        error = sysc_enable_opt_clocks(ddata);
        if (error)
                return error;

        error = sysc_enable_main_clocks(ddata);
        if (error)
                goto err_opt_clocks;

        if (!(ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)) {
                error = reset_control_deassert(ddata->rsts);
                if (error)
                        goto err_main_clocks;
                rstctrl_deasserted = true;
        }

        ddata->revision = sysc_read_revision(ddata);
        sysc_init_revision_quirks(ddata);
        sysc_init_module_quirks(ddata);

        if (ddata->legacy_mode) {
                error = sysc_legacy_init(ddata);
                if (error)
                        goto err_main_clocks;
        }

        if (!ddata->legacy_mode) {
                error = sysc_enable_module(ddata->dev);
                if (error)
                        goto err_main_clocks;
        }

        error = sysc_reset(ddata);
        if (error)
                dev_err(ddata->dev, "Reset failed with %d\n", error);

        if (error && !ddata->legacy_mode)
                sysc_disable_module(ddata->dev);

err_main_clocks:
        if (error)
                sysc_disable_main_clocks(ddata);
err_opt_clocks:
        /* No re-enable of clockdomain autoidle to prevent module autoidle */
        if (error) {
                sysc_disable_opt_clocks(ddata);
                sysc_clkdm_allow_idle(ddata);
        }

        if (error && rstctrl_deasserted &&
            !(ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT))
                reset_control_assert(ddata->rsts);

        return error;
}

static int sysc_init_sysc_mask(struct sysc *ddata)
{
        struct device_node *np = ddata->dev->of_node;
        int error;
        u32 val;

        error = of_property_read_u32(np, "ti,sysc-mask", &val);
        if (error)
                return 0;

        ddata->cfg.sysc_val = val & ddata->cap->sysc_mask;

        return 0;
}

static int sysc_init_idlemode(struct sysc *ddata, u8 *idlemodes,
                              const char *name)
{
        struct device_node *np = ddata->dev->of_node;
        struct property *prop;
        const __be32 *p;
        u32 val;

        of_property_for_each_u32(np, name, prop, p, val) {
                if (val >= SYSC_NR_IDLEMODES) {
                        dev_err(ddata->dev, "invalid idlemode: %i\n", val);
                        return -EINVAL;
                }
                *idlemodes |=  (1 << val);
        }

        return 0;
}

static int sysc_init_idlemodes(struct sysc *ddata)
{
        int error;

        error = sysc_init_idlemode(ddata, &ddata->cfg.midlemodes,
                                   "ti,sysc-midle");
        if (error)
                return error;

        error = sysc_init_idlemode(ddata, &ddata->cfg.sidlemodes,
                                   "ti,sysc-sidle");
        if (error)
                return error;

        return 0;
}

/*
 * Only some devices on omap4 and later have SYSCONFIG reset done
 * bit. We can detect this if there is no SYSSTATUS at all, or the
 * SYSTATUS bit 0 is not used. Note that some SYSSTATUS registers
 * have multiple bits for the child devices like OHCI and EHCI.
 * Depends on SYSC being parsed first.
 */
static int sysc_init_syss_mask(struct sysc *ddata)
{
        struct device_node *np = ddata->dev->of_node;
        int error;
        u32 val;

        error = of_property_read_u32(np, "ti,syss-mask", &val);
        if (error) {
                if ((ddata->cap->type == TI_SYSC_OMAP4 ||
                     ddata->cap->type == TI_SYSC_OMAP4_TIMER) &&
                    (ddata->cfg.sysc_val & SYSC_OMAP4_SOFTRESET))
                        ddata->cfg.quirks |= SYSC_QUIRK_RESET_STATUS;

                return 0;
        }

        if (!(val & 1) && (ddata->cfg.sysc_val & SYSC_OMAP4_SOFTRESET))
                ddata->cfg.quirks |= SYSC_QUIRK_RESET_STATUS;

        ddata->cfg.syss_mask = val;

        return 0;
}

/*
 * Many child device drivers need to have fck and opt clocks available
 * to get the clock rate for device internal configuration etc.
 */
static int sysc_child_add_named_clock(struct sysc *ddata,
                                      struct device *child,
                                      const char *name)
{
        struct clk *clk;
        struct clk_lookup *l;
        int error = 0;

        if (!name)
                return 0;

        clk = clk_get(child, name);
        if (!IS_ERR(clk)) {
                error = -EEXIST;
                goto put_clk;
        }

        clk = clk_get(ddata->dev, name);
        if (IS_ERR(clk))
                return -ENODEV;

        l = clkdev_create(clk, name, dev_name(child));
        if (!l)
                error = -ENOMEM;
put_clk:
        clk_put(clk);

        return error;
}

static int sysc_child_add_clocks(struct sysc *ddata,
                                 struct device *child)
{
        int i, error;

        for (i = 0; i < ddata->nr_clocks; i++) {
                error = sysc_child_add_named_clock(ddata,
                                                   child,
                                                   ddata->clock_roles[i]);
                if (error && error != -EEXIST) {
                        dev_err(ddata->dev, "could not add child clock %s: %i\n",
                                ddata->clock_roles[i], error);

                        return error;
                }
        }

        return 0;
}

static struct device_type sysc_device_type = {
};

static struct sysc *sysc_child_to_parent(struct device *dev)
{
        struct device *parent = dev->parent;

        if (!parent || parent->type != &sysc_device_type)
                return NULL;

        return dev_get_drvdata(parent);
}

static int __maybe_unused sysc_child_runtime_suspend(struct device *dev)
{
        struct sysc *ddata;
        int error;

        ddata = sysc_child_to_parent(dev);

        error = pm_generic_runtime_suspend(dev);
        if (error)
                return error;

        if (!ddata->enabled)
                return 0;

        return sysc_runtime_suspend(ddata->dev);
}

static int __maybe_unused sysc_child_runtime_resume(struct device *dev)
{
        struct sysc *ddata;
        int error;

        ddata = sysc_child_to_parent(dev);

        if (!ddata->enabled) {
                error = sysc_runtime_resume(ddata->dev);
                if (error < 0)
                        dev_err(ddata->dev,
                                "%s error: %i\n", __func__, error);
        }

        return pm_generic_runtime_resume(dev);
}

#ifdef CONFIG_PM_SLEEP
static int sysc_child_suspend_noirq(struct device *dev)
{
        struct sysc *ddata;
        int error;

        ddata = sysc_child_to_parent(dev);

        dev_dbg(ddata->dev, "%s %s\n", __func__,
                ddata->name ? ddata->name : "");

        error = pm_generic_suspend_noirq(dev);
        if (error) {
                dev_err(dev, "%s error at %i: %i\n",
                        __func__, __LINE__, error);

                return error;
        }

        if (!pm_runtime_status_suspended(dev)) {
                error = pm_generic_runtime_suspend(dev);
                if (error) {
                        dev_dbg(dev, "%s busy at %i: %i\n",
                                __func__, __LINE__, error);

                        return 0;
                }

                error = sysc_runtime_suspend(ddata->dev);
                if (error) {
                        dev_err(dev, "%s error at %i: %i\n",
                                __func__, __LINE__, error);

                        return error;
                }

                ddata->child_needs_resume = true;
        }

        return 0;
}

static int sysc_child_resume_noirq(struct device *dev)
{
        struct sysc *ddata;
        int error;

        ddata = sysc_child_to_parent(dev);

        dev_dbg(ddata->dev, "%s %s\n", __func__,
                ddata->name ? ddata->name : "");

        if (ddata->child_needs_resume) {
                ddata->child_needs_resume = false;

                error = sysc_runtime_resume(ddata->dev);
                if (error)
                        dev_err(ddata->dev,
                                "%s runtime resume error: %i\n",
                                __func__, error);

                error = pm_generic_runtime_resume(dev);
                if (error)
                        dev_err(ddata->dev,
                                "%s generic runtime resume: %i\n",
                                __func__, error);
        }

        return pm_generic_resume_noirq(dev);
}
#endif

static struct dev_pm_domain sysc_child_pm_domain = {
        .ops = {
                SET_RUNTIME_PM_OPS(sysc_child_runtime_suspend,
                                   sysc_child_runtime_resume,
                                   NULL)
                USE_PLATFORM_PM_SLEEP_OPS
                SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_child_suspend_noirq,
                                              sysc_child_resume_noirq)
        }
};

/**
 * sysc_legacy_idle_quirk - handle children in omap_device compatible way
 * @ddata: device driver data
 * @child: child device driver
 *
 * Allow idle for child devices as done with _od_runtime_suspend().
 * Otherwise many child devices will not idle because of the permanent
 * parent usecount set in pm_runtime_irq_safe().
 *
 * Note that the long term solution is to just modify the child device
 * drivers to not set pm_runtime_irq_safe() and then this can be just
 * dropped.
 */
static void sysc_legacy_idle_quirk(struct sysc *ddata, struct device *child)
{
        if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
                dev_pm_domain_set(child, &sysc_child_pm_domain);
}

static int sysc_notifier_call(struct notifier_block *nb,
                              unsigned long event, void *device)
{
        struct device *dev = device;
        struct sysc *ddata;
        int error;

        ddata = sysc_child_to_parent(dev);
        if (!ddata)
                return NOTIFY_DONE;

        switch (event) {
        case BUS_NOTIFY_ADD_DEVICE:
                error = sysc_child_add_clocks(ddata, dev);
                if (error)
                        return error;
                sysc_legacy_idle_quirk(ddata, dev);
                break;
        default:
                break;
        }

        return NOTIFY_DONE;
}

static struct notifier_block sysc_nb = {
        .notifier_call = sysc_notifier_call,
};

/* Device tree configured quirks */
struct sysc_dts_quirk {
        const char *name;
        u32 mask;
};

static const struct sysc_dts_quirk sysc_dts_quirks[] = {
        { .name = "ti,no-idle-on-init",
          .mask = SYSC_QUIRK_NO_IDLE_ON_INIT, },
        { .name = "ti,no-reset-on-init",
          .mask = SYSC_QUIRK_NO_RESET_ON_INIT, },
        { .name = "ti,no-idle",
          .mask = SYSC_QUIRK_NO_IDLE, },
};

static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
                                  bool is_child)
{
        const struct property *prop;
        int i, len;

        for (i = 0; i < ARRAY_SIZE(sysc_dts_quirks); i++) {
                const char *name = sysc_dts_quirks[i].name;

                prop = of_get_property(np, name, &len);
                if (!prop)
                        continue;

                ddata->cfg.quirks |= sysc_dts_quirks[i].mask;
                if (is_child) {
                        dev_warn(ddata->dev,
                                 "dts flag should be at module level for %s\n",
                                 name);
                }
        }
}

static int sysc_init_dts_quirks(struct sysc *ddata)
{
        struct device_node *np = ddata->dev->of_node;
        int error;
        u32 val;

        ddata->legacy_mode = of_get_property(np, "ti,hwmods", NULL);

        sysc_parse_dts_quirks(ddata, np, false);
        error = of_property_read_u32(np, "ti,sysc-delay-us", &val);
        if (!error) {
                if (val > 255) {
                        dev_warn(ddata->dev, "bad ti,sysc-delay-us: %i\n",
                                 val);
                }

                ddata->cfg.srst_udelay = (u8)val;
        }

        return 0;
}

static void sysc_unprepare(struct sysc *ddata)
{
        int i;

        if (!ddata->clocks)
                return;

        for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
                if (!IS_ERR_OR_NULL(ddata->clocks[i]))
                        clk_unprepare(ddata->clocks[i]);
        }
}

/*
 * Common sysc register bits found on omap2, also known as type1
 */
static const struct sysc_regbits sysc_regbits_omap2 = {
        .dmadisable_shift = -ENODEV,
        .midle_shift = 12,
        .sidle_shift = 3,
        .clkact_shift = 8,
        .emufree_shift = 5,
        .enwkup_shift = 2,
        .srst_shift = 1,
        .autoidle_shift = 0,
};

static const struct sysc_capabilities sysc_omap2 = {
        .type = TI_SYSC_OMAP2,
        .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY | SYSC_OMAP2_EMUFREE |
                     SYSC_OMAP2_ENAWAKEUP | SYSC_OMAP2_SOFTRESET |
                     SYSC_OMAP2_AUTOIDLE,
        .regbits = &sysc_regbits_omap2,
};

/* All omap2 and 3 timers, and timers 1, 2 & 10 on omap 4 and 5 */
static const struct sysc_capabilities sysc_omap2_timer = {
        .type = TI_SYSC_OMAP2_TIMER,
        .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY | SYSC_OMAP2_EMUFREE |
                     SYSC_OMAP2_ENAWAKEUP | SYSC_OMAP2_SOFTRESET |
                     SYSC_OMAP2_AUTOIDLE,
        .regbits = &sysc_regbits_omap2,
        .mod_quirks = SYSC_QUIRK_USE_CLOCKACT,
};

/*
 * SHAM2 (SHA1/MD5) sysc found on omap3, a variant of sysc_regbits_omap2
 * with different sidle position
 */
static const struct sysc_regbits sysc_regbits_omap3_sham = {
        .dmadisable_shift = -ENODEV,
        .midle_shift = -ENODEV,
        .sidle_shift = 4,
        .clkact_shift = -ENODEV,
        .enwkup_shift = -ENODEV,
        .srst_shift = 1,
        .autoidle_shift = 0,
        .emufree_shift = -ENODEV,
};

static const struct sysc_capabilities sysc_omap3_sham = {
        .type = TI_SYSC_OMAP3_SHAM,
        .sysc_mask = SYSC_OMAP2_SOFTRESET | SYSC_OMAP2_AUTOIDLE,
        .regbits = &sysc_regbits_omap3_sham,
};

/*
 * AES register bits found on omap3 and later, a variant of
 * sysc_regbits_omap2 with different sidle position
 */
static const struct sysc_regbits sysc_regbits_omap3_aes = {
        .dmadisable_shift = -ENODEV,
        .midle_shift = -ENODEV,
        .sidle_shift = 6,
        .clkact_shift = -ENODEV,
        .enwkup_shift = -ENODEV,
        .srst_shift = 1,
        .autoidle_shift = 0,
        .emufree_shift = -ENODEV,
};

static const struct sysc_capabilities sysc_omap3_aes = {
        .type = TI_SYSC_OMAP3_AES,
        .sysc_mask = SYSC_OMAP2_SOFTRESET | SYSC_OMAP2_AUTOIDLE,
        .regbits = &sysc_regbits_omap3_aes,
};

/*
 * Common sysc register bits found on omap4, also known as type2
 */
static const struct sysc_regbits sysc_regbits_omap4 = {
        .dmadisable_shift = 16,
        .midle_shift = 4,
        .sidle_shift = 2,
        .clkact_shift = -ENODEV,
        .enwkup_shift = -ENODEV,
        .emufree_shift = 1,
        .srst_shift = 0,
        .autoidle_shift = -ENODEV,
};

static const struct sysc_capabilities sysc_omap4 = {
        .type = TI_SYSC_OMAP4,
        .sysc_mask = SYSC_OMAP4_DMADISABLE | SYSC_OMAP4_FREEEMU |
                     SYSC_OMAP4_SOFTRESET,
        .regbits = &sysc_regbits_omap4,
};

static const struct sysc_capabilities sysc_omap4_timer = {
        .type = TI_SYSC_OMAP4_TIMER,
        .sysc_mask = SYSC_OMAP4_DMADISABLE | SYSC_OMAP4_FREEEMU |
                     SYSC_OMAP4_SOFTRESET,
        .regbits = &sysc_regbits_omap4,
};

/*
 * Common sysc register bits found on omap4, also known as type3
 */
static const struct sysc_regbits sysc_regbits_omap4_simple = {
        .dmadisable_shift = -ENODEV,
        .midle_shift = 2,
        .sidle_shift = 0,
        .clkact_shift = -ENODEV,
        .enwkup_shift = -ENODEV,
        .srst_shift = -ENODEV,
        .emufree_shift = -ENODEV,
        .autoidle_shift = -ENODEV,
};

static const struct sysc_capabilities sysc_omap4_simple = {
        .type = TI_SYSC_OMAP4_SIMPLE,
        .regbits = &sysc_regbits_omap4_simple,
};

/*
 * SmartReflex sysc found on omap34xx
 */
static const struct sysc_regbits sysc_regbits_omap34xx_sr = {
        .dmadisable_shift = -ENODEV,
        .midle_shift = -ENODEV,
        .sidle_shift = -ENODEV,
        .clkact_shift = 20,
        .enwkup_shift = -ENODEV,
        .srst_shift = -ENODEV,
        .emufree_shift = -ENODEV,
        .autoidle_shift = -ENODEV,
};

static const struct sysc_capabilities sysc_34xx_sr = {
        .type = TI_SYSC_OMAP34XX_SR,
        .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY,
        .regbits = &sysc_regbits_omap34xx_sr,
        .mod_quirks = SYSC_QUIRK_USE_CLOCKACT | SYSC_QUIRK_UNCACHED |
                      SYSC_QUIRK_LEGACY_IDLE,
};

/*
 * SmartReflex sysc found on omap36xx and later
 */
static const struct sysc_regbits sysc_regbits_omap36xx_sr = {
        .dmadisable_shift = -ENODEV,
        .midle_shift = -ENODEV,
        .sidle_shift = 24,
        .clkact_shift = -ENODEV,
        .enwkup_shift = 26,
        .srst_shift = -ENODEV,
        .emufree_shift = -ENODEV,
        .autoidle_shift = -ENODEV,
};

static const struct sysc_capabilities sysc_36xx_sr = {
        .type = TI_SYSC_OMAP36XX_SR,
        .sysc_mask = SYSC_OMAP3_SR_ENAWAKEUP,
        .regbits = &sysc_regbits_omap36xx_sr,
        .mod_quirks = SYSC_QUIRK_UNCACHED | SYSC_QUIRK_LEGACY_IDLE,
};

static const struct sysc_capabilities sysc_omap4_sr = {
        .type = TI_SYSC_OMAP4_SR,
        .regbits = &sysc_regbits_omap36xx_sr,
        .mod_quirks = SYSC_QUIRK_LEGACY_IDLE,
};

/*
 * McASP register bits found on omap4 and later
 */
static const struct sysc_regbits sysc_regbits_omap4_mcasp = {
        .dmadisable_shift = -ENODEV,
        .midle_shift = -ENODEV,
        .sidle_shift = 0,
        .clkact_shift = -ENODEV,
        .enwkup_shift = -ENODEV,
        .srst_shift = -ENODEV,
        .emufree_shift = -ENODEV,
        .autoidle_shift = -ENODEV,
};

static const struct sysc_capabilities sysc_omap4_mcasp = {
        .type = TI_SYSC_OMAP4_MCASP,
        .regbits = &sysc_regbits_omap4_mcasp,
        .mod_quirks = SYSC_QUIRK_OPT_CLKS_NEEDED,
};

/*
 * McASP found on dra7 and later
 */
static const struct sysc_capabilities sysc_dra7_mcasp = {
        .type = TI_SYSC_OMAP4_SIMPLE,
        .regbits = &sysc_regbits_omap4_simple,
        .mod_quirks = SYSC_QUIRK_OPT_CLKS_NEEDED,
};

/*
 * FS USB host found on omap4 and later
 */
static const struct sysc_regbits sysc_regbits_omap4_usb_host_fs = {
        .dmadisable_shift = -ENODEV,
        .midle_shift = -ENODEV,
        .sidle_shift = 24,
        .clkact_shift = -ENODEV,
        .enwkup_shift = 26,
        .srst_shift = -ENODEV,
        .emufree_shift = -ENODEV,
        .autoidle_shift = -ENODEV,
};

static const struct sysc_capabilities sysc_omap4_usb_host_fs = {
        .type = TI_SYSC_OMAP4_USB_HOST_FS,
        .sysc_mask = SYSC_OMAP2_ENAWAKEUP,
        .regbits = &sysc_regbits_omap4_usb_host_fs,
};

static const struct sysc_regbits sysc_regbits_dra7_mcan = {
        .dmadisable_shift = -ENODEV,
        .midle_shift = -ENODEV,
        .sidle_shift = -ENODEV,
        .clkact_shift = -ENODEV,
        .enwkup_shift = 4,
        .srst_shift = 0,
        .emufree_shift = -ENODEV,
        .autoidle_shift = -ENODEV,
};

static const struct sysc_capabilities sysc_dra7_mcan = {
        .type = TI_SYSC_DRA7_MCAN,
        .sysc_mask = SYSC_DRA7_MCAN_ENAWAKEUP | SYSC_OMAP4_SOFTRESET,
        .regbits = &sysc_regbits_dra7_mcan,
        .mod_quirks = SYSS_QUIRK_RESETDONE_INVERTED,
};

/*
 * PRUSS found on some AM33xx, AM437x and AM57xx SoCs
 */
static const struct sysc_capabilities sysc_pruss = {
        .type = TI_SYSC_PRUSS,
        .sysc_mask = SYSC_PRUSS_STANDBY_INIT | SYSC_PRUSS_SUB_MWAIT,
        .regbits = &sysc_regbits_omap4_simple,
        .mod_quirks = SYSC_MODULE_QUIRK_PRUSS,
};

static int sysc_init_pdata(struct sysc *ddata)
{
        struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
        struct ti_sysc_module_data *mdata;

        if (!pdata)
                return 0;

        mdata = devm_kzalloc(ddata->dev, sizeof(*mdata), GFP_KERNEL);
        if (!mdata)
                return -ENOMEM;

        if (ddata->legacy_mode) {
                mdata->name = ddata->legacy_mode;
                mdata->module_pa = ddata->module_pa;
                mdata->module_size = ddata->module_size;
                mdata->offsets = ddata->offsets;
                mdata->nr_offsets = SYSC_MAX_REGS;
                mdata->cap = ddata->cap;
                mdata->cfg = &ddata->cfg;
        }

        ddata->mdata = mdata;

        return 0;
}

static int sysc_init_match(struct sysc *ddata)
{
        const struct sysc_capabilities *cap;

        cap = of_device_get_match_data(ddata->dev);
        if (!cap)
                return -EINVAL;

        ddata->cap = cap;
        if (ddata->cap)
                ddata->cfg.quirks |= ddata->cap->mod_quirks;

        return 0;
}

static void ti_sysc_idle(struct work_struct *work)
{
        struct sysc *ddata;

        ddata = container_of(work, struct sysc, idle_work.work);

        /*
         * One time decrement of clock usage counts if left on from init.
         * Note that we disable opt clocks unconditionally in this case
         * as they are enabled unconditionally during init without
         * considering sysc_opt_clks_needed() at that point.
         */
        if (ddata->cfg.quirks & (SYSC_QUIRK_NO_IDLE |
                                 SYSC_QUIRK_NO_IDLE_ON_INIT)) {
                sysc_disable_main_clocks(ddata);
                sysc_disable_opt_clocks(ddata);
                sysc_clkdm_allow_idle(ddata);
        }

        /* Keep permanent PM runtime usage count for SYSC_QUIRK_NO_IDLE */
        if (ddata->cfg.quirks & SYSC_QUIRK_NO_IDLE)
                return;

        /*
         * Decrement PM runtime usage count for SYSC_QUIRK_NO_IDLE_ON_INIT
         * and SYSC_QUIRK_NO_RESET_ON_INIT
         */
        if (pm_runtime_active(ddata->dev))
                pm_runtime_put_sync(ddata->dev);
}

/*
 * SoC model and features detection. Only needed for SoCs that need
 * special handling for quirks, no need to list others.
 */
static const struct soc_device_attribute sysc_soc_match[] = {
        SOC_FLAG("OMAP242*", SOC_2420),
        SOC_FLAG("OMAP243*", SOC_2430),
        SOC_FLAG("OMAP3[45]*", SOC_3430),
        SOC_FLAG("OMAP3[67]*", SOC_3630),
        SOC_FLAG("OMAP443*", SOC_4430),
        SOC_FLAG("OMAP446*", SOC_4460),
        SOC_FLAG("OMAP447*", SOC_4470),
        SOC_FLAG("OMAP54*", SOC_5430),
        SOC_FLAG("AM433", SOC_AM3),
        SOC_FLAG("AM43*", SOC_AM4),
        SOC_FLAG("DRA7*", SOC_DRA7),

        { /* sentinel */ },
};

/*
 * List of SoCs variants with disabled features. By default we assume all
 * devices in the device tree are available so no need to list those SoCs.
 */
static const struct soc_device_attribute sysc_soc_feat_match[] = {
        /* OMAP3430/3530 and AM3517 variants with some accelerators disabled */
        SOC_FLAG("AM3505", DIS_SGX),
        SOC_FLAG("OMAP3525", DIS_SGX),
        SOC_FLAG("OMAP3515", DIS_IVA | DIS_SGX),
        SOC_FLAG("OMAP3503", DIS_ISP | DIS_IVA | DIS_SGX),

        /* OMAP3630/DM3730 variants with some accelerators disabled */
        SOC_FLAG("AM3703", DIS_IVA | DIS_SGX),
        SOC_FLAG("DM3725", DIS_SGX),
        SOC_FLAG("OMAP3611", DIS_ISP | DIS_IVA | DIS_SGX),
        SOC_FLAG("OMAP3615/AM3715", DIS_IVA),
        SOC_FLAG("OMAP3621", DIS_ISP),

        { /* sentinel */ },
};

static int sysc_add_disabled(unsigned long base)
{
        struct sysc_address *disabled_module;

        disabled_module = kzalloc(sizeof(*disabled_module), GFP_KERNEL);
        if (!disabled_module)
                return -ENOMEM;

        disabled_module->base = base;

        mutex_lock(&sysc_soc->list_lock);
        list_add(&disabled_module->node, &sysc_soc->disabled_modules);
        mutex_unlock(&sysc_soc->list_lock);

        return 0;
}

/*
 * One time init to detect the booted SoC and disable unavailable features.
 * Note that we initialize static data shared across all ti-sysc instances
 * so ddata is only used for SoC type. This can be called from module_init
 * once we no longer need to rely on platform data.
 */
static int sysc_init_soc(struct sysc *ddata)
{
        const struct soc_device_attribute *match;
        struct ti_sysc_platform_data *pdata;
        unsigned long features = 0;
        struct device_node *np;

        if (sysc_soc)
                return 0;

        sysc_soc = kzalloc(sizeof(*sysc_soc), GFP_KERNEL);
        if (!sysc_soc)
                return -ENOMEM;

        mutex_init(&sysc_soc->list_lock);
        INIT_LIST_HEAD(&sysc_soc->disabled_modules);
        sysc_soc->general_purpose = true;

        pdata = dev_get_platdata(ddata->dev);
        if (pdata && pdata->soc_type_gp)
                sysc_soc->general_purpose = pdata->soc_type_gp();

        match = soc_device_match(sysc_soc_match);
        if (match && match->data)
                sysc_soc->soc = (int)match->data;

        /*
         * Check and warn about possible old incomplete dtb. We now want to see
         * simple-pm-bus instead of simple-bus in the dtb for genpd using SoCs.
         */
        switch (sysc_soc->soc) {
        case SOC_AM3:
        case SOC_AM4:
        case SOC_4430 ... SOC_4470:
        case SOC_5430:
        case SOC_DRA7:
                np = of_find_node_by_path("/ocp");
                WARN_ONCE(np && of_device_is_compatible(np, "simple-bus"),
                          "ti-sysc: Incomplete old dtb, please update\n");
                break;
        default:
                break;
        }

        /* Ignore devices that are not available on HS and EMU SoCs */
        if (!sysc_soc->general_purpose) {
                switch (sysc_soc->soc) {
                case SOC_3430 ... SOC_3630:
                        sysc_add_disabled(0x48304000);  /* timer12 */
                        break;
                case SOC_AM3:
                        sysc_add_disabled(0x48310000);  /* rng */
                        break;
                default:
                        break;
                }
        }

        match = soc_device_match(sysc_soc_feat_match);
        if (!match)
                return 0;

        if (match->data)
                features = (unsigned long)match->data;

        /*
         * Add disabled devices to the list based on the module base.
         * Note that this must be done before we attempt to access the
         * device and have module revision checks working.
         */
        if (features & DIS_ISP)
                sysc_add_disabled(0x480bd400);
        if (features & DIS_IVA)
                sysc_add_disabled(0x5d000000);
        if (features & DIS_SGX)
                sysc_add_disabled(0x50000000);

        return 0;
}

static void sysc_cleanup_soc(void)
{
        struct sysc_address *disabled_module;
        struct list_head *pos, *tmp;

        if (!sysc_soc)
                return;

        mutex_lock(&sysc_soc->list_lock);
        list_for_each_safe(pos, tmp, &sysc_soc->disabled_modules) {
                disabled_module = list_entry(pos, struct sysc_address, node);
                list_del(pos);
                kfree(disabled_module);

        }
        mutex_unlock(&sysc_soc->list_lock);
}

static int sysc_check_disabled_devices(struct sysc *ddata)
{
        struct sysc_address *disabled_module;
        struct list_head *pos;
        int error = 0;

        mutex_lock(&sysc_soc->list_lock);
        list_for_each(pos, &sysc_soc->disabled_modules) {
                disabled_module = list_entry(pos, struct sysc_address, node);
                if (ddata->module_pa == disabled_module->base) {
                        dev_dbg(ddata->dev, "module disabled for this SoC\n");
                        error = -ENODEV;
                        break;
                }
        }
        mutex_unlock(&sysc_soc->list_lock);

        return error;
}

/*
 * Ignore timers tagged with no-reset and no-idle. These are likely in use,
 * for example by drivers/clocksource/timer-ti-dm-systimer.c. If more checks
 * are needed, we could also look at the timer register configuration.
 */
static int sysc_check_active_timer(struct sysc *ddata)
{
        if (ddata->cap->type != TI_SYSC_OMAP2_TIMER &&
            ddata->cap->type != TI_SYSC_OMAP4_TIMER)
                return 0;

        if ((ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT) &&
            (ddata->cfg.quirks & SYSC_QUIRK_NO_IDLE))
                return -ENXIO;

        return 0;
}

static const struct of_device_id sysc_match_table[] = {
        { .compatible = "simple-bus", },
        { /* sentinel */ },
};

static int sysc_probe(struct platform_device *pdev)
{
        struct ti_sysc_platform_data *pdata = dev_get_platdata(&pdev->dev);
        struct sysc *ddata;
        int error;

        ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
        if (!ddata)
                return -ENOMEM;

        ddata->offsets[SYSC_REVISION] = -ENODEV;
        ddata->offsets[SYSC_SYSCONFIG] = -ENODEV;
        ddata->offsets[SYSC_SYSSTATUS] = -ENODEV;
        ddata->dev = &pdev->dev;
        platform_set_drvdata(pdev, ddata);

        error = sysc_init_soc(ddata);
        if (error)
                return error;

        error = sysc_init_match(ddata);
        if (error)
                return error;

        error = sysc_init_dts_quirks(ddata);
        if (error)
                return error;

        error = sysc_map_and_check_registers(ddata);
        if (error)
                return error;

        error = sysc_init_sysc_mask(ddata);
        if (error)
                return error;

        error = sysc_init_idlemodes(ddata);
        if (error)
                return error;

        error = sysc_init_syss_mask(ddata);
        if (error)
                return error;

        error = sysc_init_pdata(ddata);
        if (error)
                return error;

        sysc_init_early_quirks(ddata);

        error = sysc_check_disabled_devices(ddata);
        if (error)
                return error;

        error = sysc_check_active_timer(ddata);
        if (error == -ENXIO)
                ddata->reserved = true;
        else if (error)
                return error;

        error = sysc_get_clocks(ddata);
        if (error)
                return error;

        error = sysc_init_resets(ddata);
        if (error)
                goto unprepare;

        error = sysc_init_module(ddata);
        if (error)
                goto unprepare;

        pm_runtime_enable(ddata->dev);
        error = pm_runtime_resume_and_get(ddata->dev);
        if (error < 0) {
                pm_runtime_disable(ddata->dev);
                goto unprepare;
        }

        /* Balance use counts as PM runtime should have enabled these all */
        if (!(ddata->cfg.quirks &
              (SYSC_QUIRK_NO_IDLE | SYSC_QUIRK_NO_IDLE_ON_INIT))) {
                sysc_disable_main_clocks(ddata);
                sysc_disable_opt_clocks(ddata);
                sysc_clkdm_allow_idle(ddata);
        }

        if (!(ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT))
                reset_control_assert(ddata->rsts);

        sysc_show_registers(ddata);

        ddata->dev->type = &sysc_device_type;

        if (!ddata->reserved) {
                error = of_platform_populate(ddata->dev->of_node,
                                             sysc_match_table,
                                             pdata ? pdata->auxdata : NULL,
                                             ddata->dev);
                if (error)
                        goto err;
        }

        INIT_DELAYED_WORK(&ddata->idle_work, ti_sysc_idle);

        /* At least earlycon won't survive without deferred idle */
        if (ddata->cfg.quirks & (SYSC_QUIRK_NO_IDLE |
                                 SYSC_QUIRK_NO_IDLE_ON_INIT |
                                 SYSC_QUIRK_NO_RESET_ON_INIT)) {
                schedule_delayed_work(&ddata->idle_work, 3000);
        } else {
                pm_runtime_put(&pdev->dev);
        }

        return 0;

err:
        pm_runtime_put_sync(&pdev->dev);
        pm_runtime_disable(&pdev->dev);
unprepare:
        sysc_unprepare(ddata);

        return error;
}

static int sysc_remove(struct platform_device *pdev)
{
        struct sysc *ddata = platform_get_drvdata(pdev);
        int error;

        cancel_delayed_work_sync(&ddata->idle_work);

        error = pm_runtime_resume_and_get(ddata->dev);
        if (error < 0) {
                pm_runtime_disable(ddata->dev);
                goto unprepare;
        }

        of_platform_depopulate(&pdev->dev);

        pm_runtime_put_sync(&pdev->dev);
        pm_runtime_disable(&pdev->dev);

        if (!reset_control_status(ddata->rsts))
                reset_control_assert(ddata->rsts);

unprepare:
        sysc_unprepare(ddata);

        return 0;
}

static const struct of_device_id sysc_match[] = {
        { .compatible = "ti,sysc-omap2", .data = &sysc_omap2, },
        { .compatible = "ti,sysc-omap2-timer", .data = &sysc_omap2_timer, },
        { .compatible = "ti,sysc-omap4", .data = &sysc_omap4, },
        { .compatible = "ti,sysc-omap4-timer", .data = &sysc_omap4_timer, },
        { .compatible = "ti,sysc-omap4-simple", .data = &sysc_omap4_simple, },
        { .compatible = "ti,sysc-omap3430-sr", .data = &sysc_34xx_sr, },
        { .compatible = "ti,sysc-omap3630-sr", .data = &sysc_36xx_sr, },
        { .compatible = "ti,sysc-omap4-sr", .data = &sysc_omap4_sr, },
        { .compatible = "ti,sysc-omap3-sham", .data = &sysc_omap3_sham, },
        { .compatible = "ti,sysc-omap-aes", .data = &sysc_omap3_aes, },
        { .compatible = "ti,sysc-mcasp", .data = &sysc_omap4_mcasp, },
        { .compatible = "ti,sysc-dra7-mcasp", .data = &sysc_dra7_mcasp, },
        { .compatible = "ti,sysc-usb-host-fs",
          .data = &sysc_omap4_usb_host_fs, },
        { .compatible = "ti,sysc-dra7-mcan", .data = &sysc_dra7_mcan, },
        { .compatible = "ti,sysc-pruss", .data = &sysc_pruss, },
        {  },
};
MODULE_DEVICE_TABLE(of, sysc_match);

static struct platform_driver sysc_driver = {
        .probe          = sysc_probe,
        .remove         = sysc_remove,
        .driver         = {
                .name   = "ti-sysc",
                .of_match_table = sysc_match,
                .pm = &sysc_pm_ops,
        },
};

static int __init sysc_init(void)
{
        bus_register_notifier(&platform_bus_type, &sysc_nb);

        return platform_driver_register(&sysc_driver);
}
module_init(sysc_init);

static void __exit sysc_exit(void)
{
        bus_unregister_notifier(&platform_bus_type, &sysc_nb);
        platform_driver_unregister(&sysc_driver);
        sysc_cleanup_soc();
}
module_exit(sysc_exit);

MODULE_DESCRIPTION("TI sysc interconnect target driver");
MODULE_LICENSE("GPL v2");