// SPDX-License-Identifier: GPL-2.0
/*
 * OMAP2+ PRM driver
 *
 * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
 *      Tero Kristo <t-kristo@ti.com>
 */

#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_clock.h>
#include <linux/pm_domain.h>
#include <linux/reset-controller.h>
#include <linux/delay.h>
#if IS_ENABLED(CONFIG_SUSPEND)
#include <linux/suspend.h>
#endif
#include <linux/platform_data/ti-prm.h>

enum omap_prm_domain_mode {
        OMAP_PRMD_OFF,
        OMAP_PRMD_RETENTION,
        OMAP_PRMD_ON_INACTIVE,
        OMAP_PRMD_ON_ACTIVE,
};

struct omap_prm_domain_map {
        unsigned int usable_modes;      /* Mask of hardware supported modes */
        unsigned long statechange:1;    /* Optional low-power state change */
        unsigned long logicretstate:1;  /* Optional logic off mode */
};

struct omap_prm_domain {
        struct device *dev;
        struct omap_prm *prm;
        struct generic_pm_domain pd;
        u16 pwrstctrl;
        u16 pwrstst;
        const struct omap_prm_domain_map *cap;
        u32 pwrstctrl_saved;
        unsigned int uses_pm_clk:1;
};

struct omap_rst_map {
        s8 rst;
        s8 st;
};

struct omap_prm_data {
        u32 base;
        const char *name;
        const char *clkdm_name;
        u16 pwrstctrl;
        u16 pwrstst;
        const struct omap_prm_domain_map *dmap;
        u16 rstctrl;
        u16 rstst;
        const struct omap_rst_map *rstmap;
        u8 flags;
};

struct omap_prm {
        const struct omap_prm_data *data;
        void __iomem *base;
        struct omap_prm_domain *prmd;
};

struct omap_reset_data {
        struct reset_controller_dev rcdev;
        struct omap_prm *prm;
        u32 mask;
        spinlock_t lock;
        struct clockdomain *clkdm;
        struct device *dev;
};

#define genpd_to_prm_domain(gpd) container_of(gpd, struct omap_prm_domain, pd)
#define to_omap_reset_data(p) container_of((p), struct omap_reset_data, rcdev)

#define OMAP_MAX_RESETS         8
#define OMAP_RESET_MAX_WAIT     10000

#define OMAP_PRM_HAS_RSTCTRL    BIT(0)
#define OMAP_PRM_HAS_RSTST      BIT(1)
#define OMAP_PRM_HAS_NO_CLKDM   BIT(2)
#define OMAP_PRM_RET_WHEN_IDLE  BIT(3)
#define OMAP_PRM_ON_WHEN_STANDBY        BIT(4)

#define OMAP_PRM_HAS_RESETS     (OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_RSTST)

#define PRM_STATE_MAX_WAIT      10000
#define PRM_LOGICRETSTATE       BIT(2)
#define PRM_LOWPOWERSTATECHANGE BIT(4)
#define PRM_POWERSTATE_MASK     OMAP_PRMD_ON_ACTIVE

#define PRM_ST_INTRANSITION     BIT(20)

static const struct omap_prm_domain_map omap_prm_all = {
        .usable_modes = BIT(OMAP_PRMD_ON_ACTIVE) | BIT(OMAP_PRMD_ON_INACTIVE) |
                        BIT(OMAP_PRMD_RETENTION) | BIT(OMAP_PRMD_OFF),
        .statechange = 1,
        .logicretstate = 1,
};

static const struct omap_prm_domain_map omap_prm_noinact = {
        .usable_modes = BIT(OMAP_PRMD_ON_ACTIVE) | BIT(OMAP_PRMD_RETENTION) |
                        BIT(OMAP_PRMD_OFF),
        .statechange = 1,
        .logicretstate = 1,
};

static const struct omap_prm_domain_map omap_prm_nooff = {
        .usable_modes = BIT(OMAP_PRMD_ON_ACTIVE) | BIT(OMAP_PRMD_ON_INACTIVE) |
                        BIT(OMAP_PRMD_RETENTION),
        .statechange = 1,
        .logicretstate = 1,
};

static const struct omap_prm_domain_map omap_prm_onoff_noauto = {
        .usable_modes = BIT(OMAP_PRMD_ON_ACTIVE) | BIT(OMAP_PRMD_OFF),
        .statechange = 1,
};

static const struct omap_prm_domain_map omap_prm_alwon = {
        .usable_modes = BIT(OMAP_PRMD_ON_ACTIVE),
};

static const struct omap_prm_domain_map omap_prm_reton = {
        .usable_modes = BIT(OMAP_PRMD_ON_ACTIVE) | BIT(OMAP_PRMD_RETENTION),
        .statechange = 1,
        .logicretstate = 1,
};

static const struct omap_rst_map rst_map_0[] = {
        { .rst = 0, .st = 0 },
        { .rst = -1 },
};

static const struct omap_rst_map rst_map_01[] = {
        { .rst = 0, .st = 0 },
        { .rst = 1, .st = 1 },
        { .rst = -1 },
};

static const struct omap_rst_map rst_map_012[] = {
        { .rst = 0, .st = 0 },
        { .rst = 1, .st = 1 },
        { .rst = 2, .st = 2 },
        { .rst = -1 },
};

static const struct omap_prm_data omap4_prm_data[] = {
        {
                .name = "mpu", .base = 0x4a306300,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton,
        },
        {
                .name = "tesla", .base = 0x4a306400,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
        },
        {
                .name = "abe", .base = 0x4a306500,
                .pwrstctrl = 0, .pwrstst = 0x4, .dmap = &omap_prm_all,
        },
        {
                .name = "always_on_core", .base = 0x4a306600,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
        },
        {
                .name = "core", .base = 0x4a306700,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton,
                .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ducati",
                .rstmap = rst_map_012,
                .flags = OMAP_PRM_RET_WHEN_IDLE,
        },
        {
                .name = "ivahd", .base = 0x4a306f00,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012
        },
        {
                .name = "cam", .base = 0x4a307000,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
        },
        {
                .name = "dss", .base = 0x4a307100,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact
        },
        {
                .name = "gfx", .base = 0x4a307200,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
        },
        {
                .name = "l3init", .base = 0x4a307300,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton
        },
        {
                .name = "l4per", .base = 0x4a307400,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton,
                .flags = OMAP_PRM_RET_WHEN_IDLE,
        },
        {
                .name = "cefuse", .base = 0x4a307600,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
        },
        {
                .name = "wkup", .base = 0x4a307700,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon
        },
        {
                .name = "emu", .base = 0x4a307900,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
        },
        {
                .name = "device", .base = 0x4a307b00,
                .rstctrl = 0x0, .rstst = 0x4, .rstmap = rst_map_01,
                .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM
        },
        { },
};

static const struct omap_prm_data omap5_prm_data[] = {
        {
                .name = "mpu", .base = 0x4ae06300,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton,
        },
        {
                .name = "dsp", .base = 0x4ae06400,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
        },
        {
                .name = "abe", .base = 0x4ae06500,
                .pwrstctrl = 0, .pwrstst = 0x4, .dmap = &omap_prm_nooff,
        },
        {
                .name = "coreaon", .base = 0x4ae06600,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon
        },
        {
                .name = "core", .base = 0x4ae06700,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton,
                .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ipu",
                .rstmap = rst_map_012
        },
        {
                .name = "iva", .base = 0x4ae07200,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012
        },
        {
                .name = "cam", .base = 0x4ae07300,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
        },
        {
                .name = "dss", .base = 0x4ae07400,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact
        },
        {
                .name = "gpu", .base = 0x4ae07500,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
        },
        {
                .name = "l3init", .base = 0x4ae07600,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton
        },
        {
                .name = "custefuse", .base = 0x4ae07700,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
        },
        {
                .name = "wkupaon", .base = 0x4ae07800,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon
        },
        {
                .name = "emu", .base = 0x4ae07a00,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
        },
        {
                .name = "device", .base = 0x4ae07c00,
                .rstctrl = 0x0, .rstst = 0x4, .rstmap = rst_map_01,
                .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM
        },
        { },
};

static const struct omap_prm_data dra7_prm_data[] = {
        {
                .name = "mpu", .base = 0x4ae06300,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton,
        },
        {
                .name = "dsp1", .base = 0x4ae06400,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01,
        },
        {
                .name = "ipu", .base = 0x4ae06500,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012,
                .clkdm_name = "ipu1"
        },
        {
                .name = "coreaon", .base = 0x4ae06628,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
        },
        {
                .name = "core", .base = 0x4ae06700,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
                .rstctrl = 0x210, .rstst = 0x214, .rstmap = rst_map_012,
                .clkdm_name = "ipu2"
        },
        {
                .name = "iva", .base = 0x4ae06f00,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012,
        },
        {
                .name = "cam", .base = 0x4ae07000,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
        },
        {
                .name = "dss", .base = 0x4ae07100,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
        },
        {
                .name = "gpu", .base = 0x4ae07200,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
        },
        {
                .name = "l3init", .base = 0x4ae07300,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01,
                .clkdm_name = "pcie"
        },
        {
                .name = "l4per", .base = 0x4ae07400,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
        },
        {
                .name = "custefuse", .base = 0x4ae07600,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
        },
        {
                .name = "wkupaon", .base = 0x4ae07724,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
        },
        {
                .name = "emu", .base = 0x4ae07900,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
        },
        {
                .name = "dsp2", .base = 0x4ae07b00,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
        },
        {
                .name = "eve1", .base = 0x4ae07b40,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
        },
        {
                .name = "eve2", .base = 0x4ae07b80,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
        },
        {
                .name = "eve3", .base = 0x4ae07bc0,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
        },
        {
                .name = "eve4", .base = 0x4ae07c00,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
        },
        {
                .name = "rtc", .base = 0x4ae07c60,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
        },
        {
                .name = "vpe", .base = 0x4ae07c80,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
        },
        { },
};

static const struct omap_rst_map am3_per_rst_map[] = {
        { .rst = 1 },
        { .rst = -1 },
};

static const struct omap_rst_map am3_wkup_rst_map[] = {
        { .rst = 3, .st = 5 },
        { .rst = -1 },
};

static const struct omap_prm_data am3_prm_data[] = {
        {
                .name = "per", .base = 0x44e00c00,
                .pwrstctrl = 0xc, .pwrstst = 0x8, .dmap = &omap_prm_noinact,
                .rstctrl = 0x0, .rstmap = am3_per_rst_map,
                .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_ON_WHEN_STANDBY,
                .clkdm_name = "pruss_ocp",
        },
        {
                .name = "wkup", .base = 0x44e00d00,
                .pwrstctrl = 0x4, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
                .rstctrl = 0x0, .rstst = 0xc, .rstmap = am3_wkup_rst_map,
                .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM
        },
        {
                .name = "mpu", .base = 0x44e00e00,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
        },
        {
                .name = "device", .base = 0x44e00f00,
                .rstctrl = 0x0, .rstst = 0x8, .rstmap = rst_map_01,
                .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM
        },
        {
                .name = "rtc", .base = 0x44e01000,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
        },
        {
                .name = "gfx", .base = 0x44e01100,
                .pwrstctrl = 0, .pwrstst = 0x10, .dmap = &omap_prm_noinact,
                .rstctrl = 0x4, .rstst = 0x14, .rstmap = rst_map_0, .clkdm_name = "gfx_l3",
        },
        {
                .name = "cefuse", .base = 0x44e01200,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
        },
        { },
};

static const struct omap_rst_map am4_per_rst_map[] = {
        { .rst = 1, .st = 0 },
        { .rst = -1 },
};

static const struct omap_rst_map am4_device_rst_map[] = {
        { .rst = 0, .st = 1 },
        { .rst = 1, .st = 0 },
        { .rst = -1 },
};

static const struct omap_prm_data am4_prm_data[] = {
        {
                .name = "mpu", .base = 0x44df0300,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
        },
        {
                .name = "gfx", .base = 0x44df0400,
                .pwrstctrl = 0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_0, .clkdm_name = "gfx_l3",
        },
        {
                .name = "rtc", .base = 0x44df0500,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
        },
        {
                .name = "tamper", .base = 0x44df0600,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
        },
        {
                .name = "cefuse", .base = 0x44df0700,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
        },
        {
                .name = "per", .base = 0x44df0800,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = am4_per_rst_map,
                .clkdm_name = "pruss_ocp"
        },
        {
                .name = "wkup", .base = 0x44df2000,
                .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
                .rstctrl = 0x10, .rstst = 0x14, .rstmap = am3_wkup_rst_map,
                .flags = OMAP_PRM_HAS_NO_CLKDM
        },
        {
                .name = "device", .base = 0x44df4000,
                .rstctrl = 0x0, .rstst = 0x4, .rstmap = am4_device_rst_map,
                .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM
        },
        { },
};

static const struct of_device_id omap_prm_id_table[] = {
        { .compatible = "ti,omap4-prm-inst", .data = omap4_prm_data },
        { .compatible = "ti,omap5-prm-inst", .data = omap5_prm_data },
        { .compatible = "ti,dra7-prm-inst", .data = dra7_prm_data },
        { .compatible = "ti,am3-prm-inst", .data = am3_prm_data },
        { .compatible = "ti,am4-prm-inst", .data = am4_prm_data },
        { },
};

#ifdef DEBUG
static void omap_prm_domain_show_state(struct omap_prm_domain *prmd,
                                       const char *desc)
{
        dev_dbg(prmd->dev, "%s %s: %08x/%08x\n",
                prmd->pd.name, desc,
                readl_relaxed(prmd->prm->base + prmd->pwrstctrl),
                readl_relaxed(prmd->prm->base + prmd->pwrstst));
}
#else
static inline void omap_prm_domain_show_state(struct omap_prm_domain *prmd,
                                              const char *desc)
{
}
#endif

static int omap_prm_domain_power_on(struct generic_pm_domain *domain)
{
        struct omap_prm_domain *prmd;
        int ret;
        u32 v, mode;

        prmd = genpd_to_prm_domain(domain);
        if (!prmd->cap)
                return 0;

        omap_prm_domain_show_state(prmd, "on: previous state");

        if (prmd->pwrstctrl_saved)
                v = prmd->pwrstctrl_saved;
        else
                v = readl_relaxed(prmd->prm->base + prmd->pwrstctrl);

        if (prmd->prm->data->flags & OMAP_PRM_RET_WHEN_IDLE)
                mode = OMAP_PRMD_RETENTION;
        else
                mode = OMAP_PRMD_ON_ACTIVE;

        writel_relaxed((v & ~PRM_POWERSTATE_MASK) | mode,
                       prmd->prm->base + prmd->pwrstctrl);

        /* wait for the transition bit to get cleared */
        ret = readl_relaxed_poll_timeout(prmd->prm->base + prmd->pwrstst,
                                         v, !(v & PRM_ST_INTRANSITION), 1,
                                         PRM_STATE_MAX_WAIT);
        if (ret)
                dev_err(prmd->dev, "%s: %s timed out\n",
                        prmd->pd.name, __func__);

        omap_prm_domain_show_state(prmd, "on: new state");

        return ret;
}

/* No need to check for holes in the mask for the lowest mode */
static int omap_prm_domain_find_lowest(struct omap_prm_domain *prmd)
{
        return __ffs(prmd->cap->usable_modes);
}

static int omap_prm_domain_power_off(struct generic_pm_domain *domain)
{
        struct omap_prm_domain *prmd;
        int ret;
        u32 v;

        prmd = genpd_to_prm_domain(domain);
        if (!prmd->cap)
                return 0;

        omap_prm_domain_show_state(prmd, "off: previous state");

        v = readl_relaxed(prmd->prm->base + prmd->pwrstctrl);
        prmd->pwrstctrl_saved = v;

        v &= ~PRM_POWERSTATE_MASK;
        v |= omap_prm_domain_find_lowest(prmd);

        if (prmd->cap->statechange)
                v |= PRM_LOWPOWERSTATECHANGE;
        if (prmd->cap->logicretstate)
                v &= ~PRM_LOGICRETSTATE;
        else
                v |= PRM_LOGICRETSTATE;

        writel_relaxed(v, prmd->prm->base + prmd->pwrstctrl);

        /* wait for the transition bit to get cleared */
        ret = readl_relaxed_poll_timeout(prmd->prm->base + prmd->pwrstst,
                                         v, !(v & PRM_ST_INTRANSITION), 1,
                                         PRM_STATE_MAX_WAIT);
        if (ret)
                dev_warn(prmd->dev, "%s: %s timed out\n",
                         __func__, prmd->pd.name);

        omap_prm_domain_show_state(prmd, "off: new state");

        return 0;
}

/*
 * Note that ti-sysc already manages the module clocks separately so
 * no need to manage those. Interconnect instances need clocks managed
 * for simple-pm-bus.
 */
static int omap_prm_domain_attach_clock(struct device *dev,
                                        struct omap_prm_domain *prmd)
{
        struct device_node *np = dev->of_node;
        int error;

        if (!of_device_is_compatible(np, "simple-pm-bus"))
                return 0;

        if (!of_property_present(np, "clocks"))
                return 0;

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

        error = of_pm_clk_add_clks(dev);
        if (error < 0) {
                pm_clk_destroy(dev);
                return error;
        }

        prmd->uses_pm_clk = 1;

        return 0;
}

static int omap_prm_domain_attach_dev(struct generic_pm_domain *domain,
                                      struct device *dev)
{
        struct generic_pm_domain_data *genpd_data;
        struct of_phandle_args pd_args;
        struct omap_prm_domain *prmd;
        struct device_node *np;
        int ret;

        prmd = genpd_to_prm_domain(domain);
        np = dev->of_node;

        ret = of_parse_phandle_with_args(np, "power-domains",
                                         "#power-domain-cells", 0, &pd_args);
        if (ret < 0)
                return ret;

        if (pd_args.args_count != 0)
                dev_warn(dev, "%s: unusupported #power-domain-cells: %i\n",
                         prmd->pd.name, pd_args.args_count);

        genpd_data = dev_gpd_data(dev);
        genpd_data->data = NULL;

        ret = omap_prm_domain_attach_clock(dev, prmd);
        if (ret)
                return ret;

        return 0;
}

static void omap_prm_domain_detach_dev(struct generic_pm_domain *domain,
                                       struct device *dev)
{
        struct generic_pm_domain_data *genpd_data;
        struct omap_prm_domain *prmd;

        prmd = genpd_to_prm_domain(domain);
        if (prmd->uses_pm_clk)
                pm_clk_destroy(dev);
        genpd_data = dev_gpd_data(dev);
        genpd_data->data = NULL;
}

static int omap_prm_domain_init(struct device *dev, struct omap_prm *prm)
{
        struct omap_prm_domain *prmd;
        struct device_node *np = dev->of_node;
        const struct omap_prm_data *data;
        const char *name;
        int error;

        if (!of_property_present(dev->of_node, "#power-domain-cells"))
                return 0;

        of_node_put(dev->of_node);

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

        data = prm->data;
        name = devm_kasprintf(dev, GFP_KERNEL, "prm_%s",
                              data->name);
        if (!name)
                return -ENOMEM;

        prmd->dev = dev;
        prmd->prm = prm;
        prmd->cap = prmd->prm->data->dmap;
        prmd->pwrstctrl = prmd->prm->data->pwrstctrl;
        prmd->pwrstst = prmd->prm->data->pwrstst;

        prmd->pd.name = name;
        prmd->pd.power_on = omap_prm_domain_power_on;
        prmd->pd.power_off = omap_prm_domain_power_off;
        prmd->pd.attach_dev = omap_prm_domain_attach_dev;
        prmd->pd.detach_dev = omap_prm_domain_detach_dev;
        prmd->pd.flags = GENPD_FLAG_PM_CLK;

        pm_genpd_init(&prmd->pd, NULL, true);
        error = of_genpd_add_provider_simple(np, &prmd->pd);
        if (error)
                pm_genpd_remove(&prmd->pd);
        else
                prm->prmd = prmd;

        return error;
}

static bool _is_valid_reset(struct omap_reset_data *reset, unsigned long id)
{
        if (reset->mask & BIT(id))
                return true;

        return false;
}

static int omap_reset_get_st_bit(struct omap_reset_data *reset,
                                 unsigned long id)
{
        const struct omap_rst_map *map = reset->prm->data->rstmap;

        while (map->rst >= 0) {
                if (map->rst == id)
                        return map->st;

                map++;
        }

        return id;
}

static int omap_reset_status(struct reset_controller_dev *rcdev,
                             unsigned long id)
{
        struct omap_reset_data *reset = to_omap_reset_data(rcdev);
        u32 v;
        int st_bit = omap_reset_get_st_bit(reset, id);
        bool has_rstst = reset->prm->data->rstst ||
                (reset->prm->data->flags & OMAP_PRM_HAS_RSTST);

        /* Check if we have rstst */
        if (!has_rstst)
                return -ENOTSUPP;

        /* Check if hw reset line is asserted */
        v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
        if (v & BIT(id))
                return 1;

        /*
         * Check reset status, high value means reset sequence has been
         * completed successfully so we can return 0 here (reset deasserted)
         */
        v = readl_relaxed(reset->prm->base + reset->prm->data->rstst);
        v >>= st_bit;
        v &= 1;

        return !v;
}

static int omap_reset_assert(struct reset_controller_dev *rcdev,
                             unsigned long id)
{
        struct omap_reset_data *reset = to_omap_reset_data(rcdev);
        u32 v;
        unsigned long flags;

        /* assert the reset control line */
        spin_lock_irqsave(&reset->lock, flags);
        v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
        v |= 1 << id;
        writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl);
        spin_unlock_irqrestore(&reset->lock, flags);

        return 0;
}

static int omap_reset_deassert(struct reset_controller_dev *rcdev,
                               unsigned long id)
{
        struct omap_reset_data *reset = to_omap_reset_data(rcdev);
        u32 v;
        int st_bit;
        bool has_rstst;
        unsigned long flags;
        struct ti_prm_platform_data *pdata = dev_get_platdata(reset->dev);
        int ret = 0;

        /* Nothing to do if the reset is already deasserted */
        if (!omap_reset_status(rcdev, id))
                return 0;

        has_rstst = reset->prm->data->rstst ||
                (reset->prm->data->flags & OMAP_PRM_HAS_RSTST);

        if (has_rstst) {
                st_bit = omap_reset_get_st_bit(reset, id);

                /* Clear the reset status by writing 1 to the status bit */
                v = 1 << st_bit;
                writel_relaxed(v, reset->prm->base + reset->prm->data->rstst);
        }

        if (reset->clkdm)
                pdata->clkdm_deny_idle(reset->clkdm);

        /* de-assert the reset control line */
        spin_lock_irqsave(&reset->lock, flags);
        v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
        v &= ~(1 << id);
        writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl);
        spin_unlock_irqrestore(&reset->lock, flags);

        /* wait for the reset bit to clear */
        ret = readl_relaxed_poll_timeout_atomic(reset->prm->base +
                                                reset->prm->data->rstctrl,
                                                v, !(v & BIT(id)), 1,
                                                OMAP_RESET_MAX_WAIT);
        if (ret)
                pr_err("%s: timedout waiting for %s:%lu\n", __func__,
                       reset->prm->data->name, id);

        /* wait for the status to be set */
        if (has_rstst) {
                ret = readl_relaxed_poll_timeout_atomic(reset->prm->base +
                                                 reset->prm->data->rstst,
                                                 v, v & BIT(st_bit), 1,
                                                 OMAP_RESET_MAX_WAIT);
                if (ret)
                        pr_err("%s: timedout waiting for %s:%lu\n", __func__,
                               reset->prm->data->name, id);
        }

        if (reset->clkdm)
                pdata->clkdm_allow_idle(reset->clkdm);

        return ret;
}

static const struct reset_control_ops omap_reset_ops = {
        .assert         = omap_reset_assert,
        .deassert       = omap_reset_deassert,
        .status         = omap_reset_status,
};

static int omap_prm_reset_xlate(struct reset_controller_dev *rcdev,
                                const struct of_phandle_args *reset_spec)
{
        struct omap_reset_data *reset = to_omap_reset_data(rcdev);

        if (!_is_valid_reset(reset, reset_spec->args[0]))
                return -EINVAL;

        return reset_spec->args[0];
}

static int omap_prm_reset_init(struct platform_device *pdev,
                               struct omap_prm *prm)
{
        struct omap_reset_data *reset;
        const struct omap_rst_map *map;
        struct ti_prm_platform_data *pdata = dev_get_platdata(&pdev->dev);
        char buf[32];
        u32 v;

        /*
         * Check if we have controllable resets. If either rstctrl is non-zero
         * or OMAP_PRM_HAS_RSTCTRL flag is set, we have reset control register
         * for the domain.
         */
        if (!prm->data->rstctrl && !(prm->data->flags & OMAP_PRM_HAS_RSTCTRL))
                return 0;

        /* Check if we have the pdata callbacks in place */
        if (!pdata || !pdata->clkdm_lookup || !pdata->clkdm_deny_idle ||
            !pdata->clkdm_allow_idle)
                return -EINVAL;

        map = prm->data->rstmap;
        if (!map)
                return -EINVAL;

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

        reset->rcdev.owner = THIS_MODULE;
        reset->rcdev.ops = &omap_reset_ops;
        reset->rcdev.of_node = pdev->dev.of_node;
        reset->rcdev.nr_resets = OMAP_MAX_RESETS;
        reset->rcdev.of_xlate = omap_prm_reset_xlate;
        reset->rcdev.of_reset_n_cells = 1;
        reset->dev = &pdev->dev;
        spin_lock_init(&reset->lock);

        reset->prm = prm;

        sprintf(buf, "%s_clkdm", prm->data->clkdm_name ? prm->data->clkdm_name :
                prm->data->name);

        if (!(prm->data->flags & OMAP_PRM_HAS_NO_CLKDM)) {
                reset->clkdm = pdata->clkdm_lookup(buf);
                if (!reset->clkdm)
                        return -EINVAL;
        }

        while (map->rst >= 0) {
                reset->mask |= BIT(map->rst);
                map++;
        }

        /* Quirk handling to assert rst_map_012 bits on reset and avoid errors */
        if (prm->data->rstmap == rst_map_012) {
                v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
                if ((v & reset->mask) != reset->mask) {
                        dev_dbg(&pdev->dev, "Asserting all resets: %08x\n", v);
                        writel_relaxed(reset->mask, reset->prm->base +
                                       reset->prm->data->rstctrl);
                }
        }

        return devm_reset_controller_register(&pdev->dev, &reset->rcdev);
}

static int omap_prm_probe(struct platform_device *pdev)
{
        struct resource *res;
        const struct omap_prm_data *data;
        struct omap_prm *prm;
        int ret;

        data = of_device_get_match_data(&pdev->dev);
        if (!data)
                return -ENOTSUPP;

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

        prm->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
        if (IS_ERR(prm->base))
                return PTR_ERR(prm->base);

        while (data->base != res->start) {
                if (!data->base)
                        return -EINVAL;
                data++;
        }

        prm->data = data;

        ret = omap_prm_domain_init(&pdev->dev, prm);
        if (ret)
                return ret;

        ret = omap_prm_reset_init(pdev, prm);
        if (ret)
                goto err_domain;

        return 0;

err_domain:
        of_genpd_del_provider(pdev->dev.of_node);
        pm_genpd_remove(&prm->prmd->pd);

        return ret;
}

static struct platform_driver omap_prm_driver = {
        .probe = omap_prm_probe,
        .driver = {
                .name           = KBUILD_MODNAME,
                .of_match_table = omap_prm_id_table,
        },
};
builtin_platform_driver(omap_prm_driver);