ark1668ed-bsp/linux/drivers/bus/ti-sysc.c

// SPDX-License-Identifier: GPL-2.0
/*
 * ti-sysc.c - Texas Instruments sysc interconnect target driver
 *
 * TI SoCs have an interconnect target wrapper IP for many devices. The wrapper
 * IP manages clock gating, resets, and PM capabilities for the connected devices.
 *
 * Copyright (C) 2017-2024 Texas Instruments Incorporated - https://www.ti.com/
 *
 * Many features are based on the earlier omap_hwmod arch code with thanks to all
 * the people who developed and debugged the code over the years:
 *
 * Copyright (C) 2009-2011 Nokia Corporation
 * Copyright (C) 2011-2021 Texas Instruments Incorporated - https://www.ti.com/
 */

#include <linux/io.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/cpu_pm.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/timekeeping.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_AM35,
	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_module {
	struct sysc *ddata;
	struct list_head node;
};

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

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
 * @sysconfig: saved sysconfig register value
 * @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
 * @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;
	u32 sysconfig;
	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 int sysc_reset(struct sysc *ddata);

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);
}

static int sysc_poll_reset_sysstatus(struct sysc *ddata)
{
	int error, retries;
	u32 syss_done, rstval;

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

	if (likely(!timekeeping_suspended)) {
		error = readx_poll_timeout_atomic(sysc_read_sysstatus, ddata,
				rstval, (rstval & ddata->cfg.syss_mask) ==
				syss_done, 100, MAX_MODULE_SOFTRESET_WAIT);
	} else {
		retries = MAX_MODULE_SOFTRESET_WAIT;
		while (retries--) {
			rstval = sysc_read_sysstatus(ddata);
			if ((rstval & ddata->cfg.syss_mask) == syss_done)
				return 0;
			udelay(2); /* Account for udelay flakeyness */
		}
		error = -ETIMEDOUT;
	}

	return error;
}

static int sysc_poll_reset_sysconfig(struct sysc *ddata)
{
	int error, retries;
	u32 sysc_mask, rstval;

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

	if (likely(!timekeeping_suspended)) {
		error = readx_poll_timeout_atomic(sysc_read_sysconfig, ddata,
				rstval, !(rstval & sysc_mask),
				100, MAX_MODULE_SOFTRESET_WAIT);
	} else {
		retries = MAX_MODULE_SOFTRESET_WAIT;
		while (retries--) {
			rstval = sysc_read_sysconfig(ddata);
			if (!(rstval & sysc_mask))
				return 0;
			udelay(2); /* Account for udelay flakeyness */
		}
		error = -ETIMEDOUT;
	}

	return error;
}

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

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

	syss_offset = ddata->offsets[SYSC_SYSSTATUS];

	if (syss_offset >= 0)
		error = sysc_poll_reset_sysstatus(ddata);
	else if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS)
		error = sysc_poll_reset_sysconfig(ddata);

	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;
	struct of_range_parser parser;
	struct of_range range;
	int error;

	error = of_range_parser_init(&parser, np);
	if (error)
		return error;

	for_each_of_range(&parser, &range) {
		ddata->module_pa = range.cpu_addr;
		ddata->module_size = range.size;
		break;
	}

	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
 * 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_property_present(np, "reg"))
		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;

		/* Clear WAKEUP */
		if (regbits->enwkup_shift >= 0 &&
		    ddata->cfg.sysc_val & BIT(regbits->enwkup_shift))
			reg &= ~BIT(regbits->enwkup_shift);
	} 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__);
		error = -EINVAL;
		goto save_context;
	}

	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);
	}

	error = 0;

save_context:
	/* Save context and flush posted write */
	ddata->sysconfig = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);

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

	return error;
}

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) {
		ret = 0;
		goto save_context;
	}

	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__);
			ret = -EINVAL;
			goto save_context;
		}
	}

	if (ddata->cfg.quirks & SYSC_QUIRK_SWSUP_SIDLE_ACT) {
		/* 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;
	if (regbits->autoidle_shift >= 0 &&
	    ddata->cfg.sysc_val & BIT(regbits->autoidle_shift))
		reg |= 1 << regbits->autoidle_shift;
	sysc_write_sysconfig(ddata, reg);

	ret = 0;

save_context:
	/* Save context and flush posted write */
	ddata->sysconfig = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);

	return ret;
}

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;
}

/*
 * Checks if device context was lost. Assumes the sysconfig register value
 * after lost context is different from the configured value. Only works for
 * enabled devices.
 *
 * Eventually we may want to also add support to using the context lost
 * registers that some SoCs have.
 */
static int sysc_check_context(struct sysc *ddata)
{
	u32 reg;

	if (!ddata->enabled)
		return -ENODATA;

	reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
	if (reg == ddata->sysconfig)
		return 0;

	return -EACCES;
}

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

	if (ddata->enabled) {
		/* Nothing to do if enabled and context not lost */
		error = sysc_check_context(ddata);
		if (!error)
			return 0;

		/* Disable target module if it is 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);

	/* Some modules like am335x gpmc need reset and restore of sysconfig */
	if (ddata->cfg.quirks & SYSC_QUIRK_RESET_ON_CTX_LOST) {
		error = sysc_reset(ddata);
		if (error)
			dev_warn(dev, "reinit reset failed: %i\n", error);

		sysc_write_sysconfig(ddata, ddata->sysconfig);
	}

	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_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_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[] = {
	/* 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("gpio", 0, 0, 0x10, 0x114, 0x50600801, 0xffff00ff,
		   SYSC_QUIRK_OPT_CLKS_IN_RESET),
	SYSC_QUIRK("gpmc", 0, 0, 0x10, 0x14, 0x00000060, 0xffffffff,
		   SYSC_QUIRK_REINIT_ON_CTX_LOST | SYSC_QUIRK_RESET_ON_CTX_LOST |
		   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("uart", 0, 0x50, 0x54, 0x58, 0x00000046, 0xffffffff,
		   SYSC_QUIRK_SWSUP_SIDLE_ACT),
	SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff,
		   SYSC_QUIRK_SWSUP_SIDLE_ACT),
	/* Uarts on omap4 and later */
	SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x50411e03, 0xffff00ff,
		   SYSC_QUIRK_SWSUP_SIDLE_ACT),
	SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x47422e03, 0xffffffff,
		   SYSC_QUIRK_SWSUP_SIDLE_ACT),
	SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x47424e03, 0xffffffff,
		   SYSC_QUIRK_SWSUP_SIDLE_ACT),
	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, 0x00000033,
		   0xffffffff, SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY |
		   SYSC_MODULE_QUIRK_OTG),
	SYSC_QUIRK("usb_otg_hs", 0, 0x400, 0x404, 0x408, 0x00000040,
		   0xffffffff, SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY |
		   SYSC_MODULE_QUIRK_OTG),
	SYSC_QUIRK("usb_otg_hs", 0, 0x400, 0x404, 0x408, 0x00000050,
		   0xffffffff, SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY |
		   SYSC_MODULE_QUIRK_OTG),
	SYSC_QUIRK("usb_otg_hs", 0, 0, 0x10, -ENODEV, 0x4ea2080d, 0xffffffff,
		   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY |
		   SYSC_QUIRK_REINIT_ON_CTX_LOST),
	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("sham", 0, 0x100, 0x110, 0x114, 0x40000c03, 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, shut down lcd and digit on disable if enabled */
	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 || sysc_soc->soc == SOC_AM35) {
		/* 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);
}

/* OTG omap2430 glue layer up to omap4 needs OTG_FORCESTDBY configured */
static void sysc_module_enable_quirk_otg(struct sysc *ddata)
{
	int offset = 0x414;	/* OTG_FORCESTDBY */

	sysc_write(ddata, offset, 0);
}

static void sysc_module_disable_quirk_otg(struct sysc *ddata)
{
	int offset = 0x414;	/* OTG_FORCESTDBY */
	u32 val = BIT(0);	/* ENABLEFORCE */

	sysc_write(ddata, offset, val);
}

/* 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_OTG) {
		ddata->module_enable_quirk = sysc_module_enable_quirk_otg;
		ddata->module_disable_quirk = sysc_module_disable_quirk_otg;
	}

	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)
		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);

		/*
		 * Some devices need a delay before reading registers
		 * after reset. Presumably a srst_udelay is not needed
		 * for devices that use a rstctrl register reset.
		 */
		if (ddata->cfg.srst_udelay)
			fsleep(ddata->cfg.srst_udelay);

		/*
		 * Flush posted write. For devices needing srst_udelay
		 * this should trigger an interconnect error if the
		 * srst_udelay value is needed but not configured.
		 */
		sysc_val = sysc_read_sysconfig(ddata);
	}

	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;
	}

	if (!(ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)) {
		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;
	u32 val;

	of_property_for_each_u32(np, name, 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 const 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);
}

/* Caller needs to take list_lock if ever used outside of cpu_pm */
static void sysc_reinit_modules(struct sysc_soc_info *soc)
{
	struct sysc_module *module;
	struct sysc *ddata;

	list_for_each_entry(module, &sysc_soc->restored_modules, node) {
		ddata = module->ddata;
		sysc_reinit_module(ddata, ddata->enabled);
	}
}

/**
 * sysc_context_notifier - optionally reset and restore module after idle
 * @nb: notifier block
 * @cmd: unused
 * @v: unused
 *
 * Some interconnect target modules need to be restored, or reset and restored
 * on CPU_PM CPU_PM_CLUSTER_EXIT notifier. This is needed at least for am335x
 * OTG and GPMC target modules even if the modules are unused.
 */
static int sysc_context_notifier(struct notifier_block *nb, unsigned long cmd,
				 void *v)
{
	struct sysc_soc_info *soc;

	soc = container_of(nb, struct sysc_soc_info, nb);

	switch (cmd) {
	case CPU_CLUSTER_PM_ENTER:
		break;
	case CPU_CLUSTER_PM_ENTER_FAILED:	/* No need to restore context */
		break;
	case CPU_CLUSTER_PM_EXIT:
		sysc_reinit_modules(soc);
		break;
	}

	return NOTIFY_OK;
}

/**
 * sysc_add_restored - optionally add reset and restore quirk hanlling
 * @ddata: device data
 */
static void sysc_add_restored(struct sysc *ddata)
{
	struct sysc_module *restored_module;

	restored_module = kzalloc(sizeof(*restored_module), GFP_KERNEL);
	if (!restored_module)
		return;

	restored_module->ddata = ddata;

	mutex_lock(&sysc_soc->list_lock);

	list_add(&restored_module->node, &sysc_soc->restored_modules);

	if (sysc_soc->nb.notifier_call)
		goto out_unlock;

	sysc_soc->nb.notifier_call = sysc_context_notifier;
	cpu_pm_register_notifier(&sysc_soc->nb);

out_unlock:
	mutex_unlock(&sysc_soc->list_lock);
}

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;
		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)
{
	int i;

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

		if (!of_property_present(np, name))
			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,
};

/*
 * 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,
};

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

/*
 * 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("AM35*", SOC_AM35),
	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, disable unavailable features
 * and initialize list for optional cpu_pm notifier.
 *
 * 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_static_data(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);
	INIT_LIST_HEAD(&sysc_soc->restored_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 = (enum sysc_soc)(uintptr_t)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_static_data(void)
{
	struct sysc_module *restored_module;
	struct sysc_address *disabled_module;
	struct list_head *pos, *tmp;

	if (!sysc_soc)
		return;

	if (sysc_soc->nb.notifier_call)
		cpu_pm_unregister_notifier(&sysc_soc->nb);

	mutex_lock(&sysc_soc->list_lock);
	list_for_each_safe(pos, tmp, &sysc_soc->restored_modules) {
		restored_module = list_entry(pos, struct sysc_module, node);
		list_del(pos);
		kfree(restored_module);
	}
	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;
	int error = 0;

	mutex_lock(&sysc_soc->list_lock);
	list_for_each_entry(disabled_module, &sysc_soc->disabled_modules, 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)
{
	int error;

	if (ddata->cap->type != TI_SYSC_OMAP2_TIMER &&
	    ddata->cap->type != TI_SYSC_OMAP4_TIMER)
		return 0;

	/*
	 * Quirk for omap3 beagleboard revision A to B4 to use gpt12.
	 * Revision C and later are fixed with commit 23885389dbbb ("ARM:
	 * dts: Fix timer regression for beagleboard revision c"). This all
	 * can be dropped if we stop supporting old beagleboard revisions
	 * A to B4 at some point.
	 */
	if (sysc_soc->soc == SOC_3430 || sysc_soc->soc == SOC_AM35)
		error = -ENXIO;
	else
		error = -EBUSY;

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

	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_static_data(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);
	}

	if (ddata->cfg.quirks & SYSC_QUIRK_REINIT_ON_CTX_LOST)
		sysc_add_restored(ddata);

	return 0;

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

	return error;
}

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

	/* Device can still be enabled, see deferred idle quirk in probe */
	if (cancel_delayed_work_sync(&ddata->idle_work))
		ti_sysc_idle(&ddata->idle_work.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);
}

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_new	= 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_static_data();
}
module_exit(sysc_exit);

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