/*
 * Copyright (c) 2014 MediaTek Inc.
 * Author: Flora Fu, MediaTek
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset.h>

#define PWRAP_MT8135_BRIDGE_IORD_ARB_EN		0x4
#define PWRAP_MT8135_BRIDGE_WACS3_EN		0x10
#define PWRAP_MT8135_BRIDGE_INIT_DONE3		0x14
#define PWRAP_MT8135_BRIDGE_WACS4_EN		0x24
#define PWRAP_MT8135_BRIDGE_INIT_DONE4		0x28
#define PWRAP_MT8135_BRIDGE_INT_EN		0x38
#define PWRAP_MT8135_BRIDGE_TIMER_EN		0x48
#define PWRAP_MT8135_BRIDGE_WDT_UNIT		0x50
#define PWRAP_MT8135_BRIDGE_WDT_SRC_EN		0x54

/* macro for wrapper status */
#define PWRAP_GET_WACS_RDATA(x)		(((x) >> 0) & 0x0000ffff)
#define PWRAP_GET_WACS_FSM(x)		(((x) >> 16) & 0x00000007)
#define PWRAP_GET_WACS_REQ(x)		(((x) >> 19) & 0x00000001)
#define PWRAP_STATE_SYNC_IDLE0		(1 << 20)
#define PWRAP_STATE_INIT_DONE0		(1 << 21)

/* macro for WACS FSM */
#define PWRAP_WACS_FSM_IDLE		0x00
#define PWRAP_WACS_FSM_REQ		0x02
#define PWRAP_WACS_FSM_WFDLE		0x04
#define PWRAP_WACS_FSM_WFVLDCLR		0x06
#define PWRAP_WACS_INIT_DONE		0x01
#define PWRAP_WACS_WACS_SYNC_IDLE	0x01
#define PWRAP_WACS_SYNC_BUSY		0x00

/* macro for device wrapper default value */
#define PWRAP_DEW_READ_TEST_VAL		0x5aa5
#define PWRAP_DEW_WRITE_TEST_VAL	0xa55a

/* macro for manual command */
#define PWRAP_MAN_CMD_SPI_WRITE		(1 << 13)
#define PWRAP_MAN_CMD_OP_CSH		(0x0 << 8)
#define PWRAP_MAN_CMD_OP_CSL		(0x1 << 8)
#define PWRAP_MAN_CMD_OP_CK		(0x2 << 8)
#define PWRAP_MAN_CMD_OP_OUTS		(0x8 << 8)
#define PWRAP_MAN_CMD_OP_OUTD		(0x9 << 8)
#define PWRAP_MAN_CMD_OP_OUTQ		(0xa << 8)

/* macro for Watch Dog Timer Source */
#define PWRAP_WDT_SRC_EN_STAUPD_TRIG		(1 << 25)
#define PWRAP_WDT_SRC_EN_HARB_STAUPD_DLE	(1 << 20)
#define PWRAP_WDT_SRC_EN_HARB_STAUPD_ALE	(1 << 6)
#define PWRAP_WDT_SRC_MASK_ALL			0xffffffff
#define PWRAP_WDT_SRC_MASK_NO_STAUPD	~(PWRAP_WDT_SRC_EN_STAUPD_TRIG | \
					  PWRAP_WDT_SRC_EN_HARB_STAUPD_DLE | \
					  PWRAP_WDT_SRC_EN_HARB_STAUPD_ALE)

/* macro for slave device wrapper registers */
#define PWRAP_DEW_BASE			0xbc00
#define PWRAP_DEW_EVENT_OUT_EN		(PWRAP_DEW_BASE + 0x0)
#define PWRAP_DEW_DIO_EN		(PWRAP_DEW_BASE + 0x2)
#define PWRAP_DEW_EVENT_SRC_EN		(PWRAP_DEW_BASE + 0x4)
#define PWRAP_DEW_EVENT_SRC		(PWRAP_DEW_BASE + 0x6)
#define PWRAP_DEW_EVENT_FLAG		(PWRAP_DEW_BASE + 0x8)
#define PWRAP_DEW_READ_TEST		(PWRAP_DEW_BASE + 0xa)
#define PWRAP_DEW_WRITE_TEST		(PWRAP_DEW_BASE + 0xc)
#define PWRAP_DEW_CRC_EN		(PWRAP_DEW_BASE + 0xe)
#define PWRAP_DEW_CRC_VAL		(PWRAP_DEW_BASE + 0x10)
#define PWRAP_DEW_MON_GRP_SEL		(PWRAP_DEW_BASE + 0x12)
#define PWRAP_DEW_MON_FLAG_SEL		(PWRAP_DEW_BASE + 0x14)
#define PWRAP_DEW_EVENT_TEST		(PWRAP_DEW_BASE + 0x16)
#define PWRAP_DEW_CIPHER_KEY_SEL	(PWRAP_DEW_BASE + 0x18)
#define PWRAP_DEW_CIPHER_IV_SEL		(PWRAP_DEW_BASE + 0x1a)
#define PWRAP_DEW_CIPHER_LOAD		(PWRAP_DEW_BASE + 0x1c)
#define PWRAP_DEW_CIPHER_START		(PWRAP_DEW_BASE + 0x1e)
#define PWRAP_DEW_CIPHER_RDY		(PWRAP_DEW_BASE + 0x20)
#define PWRAP_DEW_CIPHER_MODE		(PWRAP_DEW_BASE + 0x22)
#define PWRAP_DEW_CIPHER_SWRST		(PWRAP_DEW_BASE + 0x24)
#define PWRAP_MT8173_DEW_CIPHER_IV0	(PWRAP_DEW_BASE + 0x26)
#define PWRAP_MT8173_DEW_CIPHER_IV1	(PWRAP_DEW_BASE + 0x28)
#define PWRAP_MT8173_DEW_CIPHER_IV2	(PWRAP_DEW_BASE + 0x2a)
#define PWRAP_MT8173_DEW_CIPHER_IV3	(PWRAP_DEW_BASE + 0x2c)
#define PWRAP_MT8173_DEW_CIPHER_IV4	(PWRAP_DEW_BASE + 0x2e)
#define PWRAP_MT8173_DEW_CIPHER_IV5	(PWRAP_DEW_BASE + 0x30)

enum pwrap_regs {
	PWRAP_MUX_SEL,
	PWRAP_WRAP_EN,
	PWRAP_DIO_EN,
	PWRAP_SIDLY,
	PWRAP_CSHEXT_WRITE,
	PWRAP_CSHEXT_READ,
	PWRAP_CSLEXT_START,
	PWRAP_CSLEXT_END,
	PWRAP_STAUPD_PRD,
	PWRAP_STAUPD_GRPEN,
	PWRAP_STAUPD_MAN_TRIG,
	PWRAP_STAUPD_STA,
	PWRAP_WRAP_STA,
	PWRAP_HARB_INIT,
	PWRAP_HARB_HPRIO,
	PWRAP_HIPRIO_ARB_EN,
	PWRAP_HARB_STA0,
	PWRAP_HARB_STA1,
	PWRAP_MAN_EN,
	PWRAP_MAN_CMD,
	PWRAP_MAN_RDATA,
	PWRAP_MAN_VLDCLR,
	PWRAP_WACS0_EN,
	PWRAP_INIT_DONE0,
	PWRAP_WACS0_CMD,
	PWRAP_WACS0_RDATA,
	PWRAP_WACS0_VLDCLR,
	PWRAP_WACS1_EN,
	PWRAP_INIT_DONE1,
	PWRAP_WACS1_CMD,
	PWRAP_WACS1_RDATA,
	PWRAP_WACS1_VLDCLR,
	PWRAP_WACS2_EN,
	PWRAP_INIT_DONE2,
	PWRAP_WACS2_CMD,
	PWRAP_WACS2_RDATA,
	PWRAP_WACS2_VLDCLR,
	PWRAP_INT_EN,
	PWRAP_INT_FLG_RAW,
	PWRAP_INT_FLG,
	PWRAP_INT_CLR,
	PWRAP_SIG_ADR,
	PWRAP_SIG_MODE,
	PWRAP_SIG_VALUE,
	PWRAP_SIG_ERRVAL,
	PWRAP_CRC_EN,
	PWRAP_TIMER_EN,
	PWRAP_TIMER_STA,
	PWRAP_WDT_UNIT,
	PWRAP_WDT_SRC_EN,
	PWRAP_WDT_FLG,
	PWRAP_DEBUG_INT_SEL,
	PWRAP_CIPHER_KEY_SEL,
	PWRAP_CIPHER_IV_SEL,
	PWRAP_CIPHER_RDY,
	PWRAP_CIPHER_MODE,
	PWRAP_CIPHER_SWRST,
	PWRAP_DCM_EN,
	PWRAP_DCM_DBC_PRD,

	/* MT8135 only regs */
	PWRAP_CSHEXT,
	PWRAP_EVENT_IN_EN,
	PWRAP_EVENT_DST_EN,
	PWRAP_RRARB_INIT,
	PWRAP_RRARB_EN,
	PWRAP_RRARB_STA0,
	PWRAP_RRARB_STA1,
	PWRAP_EVENT_STA,
	PWRAP_EVENT_STACLR,
	PWRAP_CIPHER_LOAD,
	PWRAP_CIPHER_START,

	/* MT8173 only regs */
	PWRAP_RDDMY,
	PWRAP_SI_CK_CON,
	PWRAP_DVFS_ADR0,
	PWRAP_DVFS_WDATA0,
	PWRAP_DVFS_ADR1,
	PWRAP_DVFS_WDATA1,
	PWRAP_DVFS_ADR2,
	PWRAP_DVFS_WDATA2,
	PWRAP_DVFS_ADR3,
	PWRAP_DVFS_WDATA3,
	PWRAP_DVFS_ADR4,
	PWRAP_DVFS_WDATA4,
	PWRAP_DVFS_ADR5,
	PWRAP_DVFS_WDATA5,
	PWRAP_DVFS_ADR6,
	PWRAP_DVFS_WDATA6,
	PWRAP_DVFS_ADR7,
	PWRAP_DVFS_WDATA7,
	PWRAP_SPMINF_STA,
	PWRAP_CIPHER_EN,
};

static int mt8173_regs[] = {
	[PWRAP_MUX_SEL] =		0x0,
	[PWRAP_WRAP_EN] =		0x4,
	[PWRAP_DIO_EN] =		0x8,
	[PWRAP_SIDLY] =			0xc,
	[PWRAP_RDDMY] =			0x10,
	[PWRAP_SI_CK_CON] =		0x14,
	[PWRAP_CSHEXT_WRITE] =		0x18,
	[PWRAP_CSHEXT_READ] =		0x1c,
	[PWRAP_CSLEXT_START] =		0x20,
	[PWRAP_CSLEXT_END] =		0x24,
	[PWRAP_STAUPD_PRD] =		0x28,
	[PWRAP_STAUPD_GRPEN] =		0x2c,
	[PWRAP_STAUPD_MAN_TRIG] =	0x40,
	[PWRAP_STAUPD_STA] =		0x44,
	[PWRAP_WRAP_STA] =		0x48,
	[PWRAP_HARB_INIT] =		0x4c,
	[PWRAP_HARB_HPRIO] =		0x50,
	[PWRAP_HIPRIO_ARB_EN] =		0x54,
	[PWRAP_HARB_STA0] =		0x58,
	[PWRAP_HARB_STA1] =		0x5c,
	[PWRAP_MAN_EN] =		0x60,
	[PWRAP_MAN_CMD] =		0x64,
	[PWRAP_MAN_RDATA] =		0x68,
	[PWRAP_MAN_VLDCLR] =		0x6c,
	[PWRAP_WACS0_EN] =		0x70,
	[PWRAP_INIT_DONE0] =		0x74,
	[PWRAP_WACS0_CMD] =		0x78,
	[PWRAP_WACS0_RDATA] =		0x7c,
	[PWRAP_WACS0_VLDCLR] =		0x80,
	[PWRAP_WACS1_EN] =		0x84,
	[PWRAP_INIT_DONE1] =		0x88,
	[PWRAP_WACS1_CMD] =		0x8c,
	[PWRAP_WACS1_RDATA] =		0x90,
	[PWRAP_WACS1_VLDCLR] =		0x94,
	[PWRAP_WACS2_EN] =		0x98,
	[PWRAP_INIT_DONE2] =		0x9c,
	[PWRAP_WACS2_CMD] =		0xa0,
	[PWRAP_WACS2_RDATA] =		0xa4,
	[PWRAP_WACS2_VLDCLR] =		0xa8,
	[PWRAP_INT_EN] =		0xac,
	[PWRAP_INT_FLG_RAW] =		0xb0,
	[PWRAP_INT_FLG] =		0xb4,
	[PWRAP_INT_CLR] =		0xb8,
	[PWRAP_SIG_ADR] =		0xbc,
	[PWRAP_SIG_MODE] =		0xc0,
	[PWRAP_SIG_VALUE] =		0xc4,
	[PWRAP_SIG_ERRVAL] =		0xc8,
	[PWRAP_CRC_EN] =		0xcc,
	[PWRAP_TIMER_EN] =		0xd0,
	[PWRAP_TIMER_STA] =		0xd4,
	[PWRAP_WDT_UNIT] =		0xd8,
	[PWRAP_WDT_SRC_EN] =		0xdc,
	[PWRAP_WDT_FLG] =		0xe0,
	[PWRAP_DEBUG_INT_SEL] =		0xe4,
	[PWRAP_DVFS_ADR0] =		0xe8,
	[PWRAP_DVFS_WDATA0] =		0xec,
	[PWRAP_DVFS_ADR1] =		0xf0,
	[PWRAP_DVFS_WDATA1] =		0xf4,
	[PWRAP_DVFS_ADR2] =		0xf8,
	[PWRAP_DVFS_WDATA2] =		0xfc,
	[PWRAP_DVFS_ADR3] =		0x100,
	[PWRAP_DVFS_WDATA3] =		0x104,
	[PWRAP_DVFS_ADR4] =		0x108,
	[PWRAP_DVFS_WDATA4] =		0x10c,
	[PWRAP_DVFS_ADR5] =		0x110,
	[PWRAP_DVFS_WDATA5] =		0x114,
	[PWRAP_DVFS_ADR6] =		0x118,
	[PWRAP_DVFS_WDATA6] =		0x11c,
	[PWRAP_DVFS_ADR7] =		0x120,
	[PWRAP_DVFS_WDATA7] =		0x124,
	[PWRAP_SPMINF_STA] =		0x128,
	[PWRAP_CIPHER_KEY_SEL] =	0x12c,
	[PWRAP_CIPHER_IV_SEL] =		0x130,
	[PWRAP_CIPHER_EN] =		0x134,
	[PWRAP_CIPHER_RDY] =		0x138,
	[PWRAP_CIPHER_MODE] =		0x13c,
	[PWRAP_CIPHER_SWRST] =		0x140,
	[PWRAP_DCM_EN] =		0x144,
	[PWRAP_DCM_DBC_PRD] =		0x148,
};

static int mt8135_regs[] = {
	[PWRAP_MUX_SEL] =		0x0,
	[PWRAP_WRAP_EN] =		0x4,
	[PWRAP_DIO_EN] =		0x8,
	[PWRAP_SIDLY] =			0xc,
	[PWRAP_CSHEXT] =		0x10,
	[PWRAP_CSHEXT_WRITE] =		0x14,
	[PWRAP_CSHEXT_READ] =		0x18,
	[PWRAP_CSLEXT_START] =		0x1c,
	[PWRAP_CSLEXT_END] =		0x20,
	[PWRAP_STAUPD_PRD] =		0x24,
	[PWRAP_STAUPD_GRPEN] =		0x28,
	[PWRAP_STAUPD_MAN_TRIG] =	0x2c,
	[PWRAP_STAUPD_STA] =		0x30,
	[PWRAP_EVENT_IN_EN] =		0x34,
	[PWRAP_EVENT_DST_EN] =		0x38,
	[PWRAP_WRAP_STA] =		0x3c,
	[PWRAP_RRARB_INIT] =		0x40,
	[PWRAP_RRARB_EN] =		0x44,
	[PWRAP_RRARB_STA0] =		0x48,
	[PWRAP_RRARB_STA1] =		0x4c,
	[PWRAP_HARB_INIT] =		0x50,
	[PWRAP_HARB_HPRIO] =		0x54,
	[PWRAP_HIPRIO_ARB_EN] =		0x58,
	[PWRAP_HARB_STA0] =		0x5c,
	[PWRAP_HARB_STA1] =		0x60,
	[PWRAP_MAN_EN] =		0x64,
	[PWRAP_MAN_CMD] =		0x68,
	[PWRAP_MAN_RDATA] =		0x6c,
	[PWRAP_MAN_VLDCLR] =		0x70,
	[PWRAP_WACS0_EN] =		0x74,
	[PWRAP_INIT_DONE0] =		0x78,
	[PWRAP_WACS0_CMD] =		0x7c,
	[PWRAP_WACS0_RDATA] =		0x80,
	[PWRAP_WACS0_VLDCLR] =		0x84,
	[PWRAP_WACS1_EN] =		0x88,
	[PWRAP_INIT_DONE1] =		0x8c,
	[PWRAP_WACS1_CMD] =		0x90,
	[PWRAP_WACS1_RDATA] =		0x94,
	[PWRAP_WACS1_VLDCLR] =		0x98,
	[PWRAP_WACS2_EN] =		0x9c,
	[PWRAP_INIT_DONE2] =		0xa0,
	[PWRAP_WACS2_CMD] =		0xa4,
	[PWRAP_WACS2_RDATA] =		0xa8,
	[PWRAP_WACS2_VLDCLR] =		0xac,
	[PWRAP_INT_EN] =		0xb0,
	[PWRAP_INT_FLG_RAW] =		0xb4,
	[PWRAP_INT_FLG] =		0xb8,
	[PWRAP_INT_CLR] =		0xbc,
	[PWRAP_SIG_ADR] =		0xc0,
	[PWRAP_SIG_MODE] =		0xc4,
	[PWRAP_SIG_VALUE] =		0xc8,
	[PWRAP_SIG_ERRVAL] =		0xcc,
	[PWRAP_CRC_EN] =		0xd0,
	[PWRAP_EVENT_STA] =		0xd4,
	[PWRAP_EVENT_STACLR] =		0xd8,
	[PWRAP_TIMER_EN] =		0xdc,
	[PWRAP_TIMER_STA] =		0xe0,
	[PWRAP_WDT_UNIT] =		0xe4,
	[PWRAP_WDT_SRC_EN] =		0xe8,
	[PWRAP_WDT_FLG] =		0xec,
	[PWRAP_DEBUG_INT_SEL] =		0xf0,
	[PWRAP_CIPHER_KEY_SEL] =	0x134,
	[PWRAP_CIPHER_IV_SEL] =		0x138,
	[PWRAP_CIPHER_LOAD] =		0x13c,
	[PWRAP_CIPHER_START] =		0x140,
	[PWRAP_CIPHER_RDY] =		0x144,
	[PWRAP_CIPHER_MODE] =		0x148,
	[PWRAP_CIPHER_SWRST] =		0x14c,
	[PWRAP_DCM_EN] =		0x15c,
	[PWRAP_DCM_DBC_PRD] =		0x160,
};

enum pwrap_type {
	PWRAP_MT8135,
	PWRAP_MT8173,
};

struct pmic_wrapper_type {
	int *regs;
	enum pwrap_type type;
	u32 arb_en_all;
};

static struct pmic_wrapper_type pwrap_mt8135 = {
	.regs = mt8135_regs,
	.type = PWRAP_MT8135,
	.arb_en_all = 0x1ff,
};

static struct pmic_wrapper_type pwrap_mt8173 = {
	.regs = mt8173_regs,
	.type = PWRAP_MT8173,
	.arb_en_all = 0x3f,
};

struct pmic_wrapper {
	struct device *dev;
	void __iomem *base;
	struct regmap *regmap;
	int *regs;
	enum pwrap_type type;
	u32 arb_en_all;
	struct clk *clk_spi;
	struct clk *clk_wrap;
	struct reset_control *rstc;

	struct reset_control *rstc_bridge;
	void __iomem *bridge_base;
};

static inline int pwrap_is_mt8135(struct pmic_wrapper *wrp)
{
	return wrp->type == PWRAP_MT8135;
}

static inline int pwrap_is_mt8173(struct pmic_wrapper *wrp)
{
	return wrp->type == PWRAP_MT8173;
}

static u32 pwrap_readl(struct pmic_wrapper *wrp, enum pwrap_regs reg)
{
	return readl(wrp->base + wrp->regs[reg]);
}

static void pwrap_writel(struct pmic_wrapper *wrp, u32 val, enum pwrap_regs reg)
{
	writel(val, wrp->base + wrp->regs[reg]);
}

static bool pwrap_is_fsm_idle(struct pmic_wrapper *wrp)
{
	u32 val = pwrap_readl(wrp, PWRAP_WACS2_RDATA);

	return PWRAP_GET_WACS_FSM(val) == PWRAP_WACS_FSM_IDLE;
}

static bool pwrap_is_fsm_vldclr(struct pmic_wrapper *wrp)
{
	u32 val = pwrap_readl(wrp, PWRAP_WACS2_RDATA);

	return PWRAP_GET_WACS_FSM(val) == PWRAP_WACS_FSM_WFVLDCLR;
}

/*
 * Timeout issue sometimes caused by the last read command
 * failed because pmic wrap could not got the FSM_VLDCLR
 * in time after finishing WACS2_CMD. It made state machine
 * still on FSM_VLDCLR and timeout next time.
 * Check the status of FSM and clear the vldclr to recovery the
 * error.
 */
static inline void pwrap_leave_fsm_vldclr(struct pmic_wrapper *wrp)
{
	if (pwrap_is_fsm_vldclr(wrp))
		pwrap_writel(wrp, 1, PWRAP_WACS2_VLDCLR);
}

static bool pwrap_is_sync_idle(struct pmic_wrapper *wrp)
{
	return pwrap_readl(wrp, PWRAP_WACS2_RDATA) & PWRAP_STATE_SYNC_IDLE0;
}

static bool pwrap_is_fsm_idle_and_sync_idle(struct pmic_wrapper *wrp)
{
	u32 val = pwrap_readl(wrp, PWRAP_WACS2_RDATA);

	return (PWRAP_GET_WACS_FSM(val) == PWRAP_WACS_FSM_IDLE) &&
		(val & PWRAP_STATE_SYNC_IDLE0);
}

static int pwrap_wait_for_state(struct pmic_wrapper *wrp,
		bool (*fp)(struct pmic_wrapper *))
{
	unsigned long timeout;

	timeout = jiffies + usecs_to_jiffies(255);

	do {
		if (time_after(jiffies, timeout))
			return fp(wrp) ? 0 : -ETIMEDOUT;
		if (fp(wrp))
			return 0;
	} while (1);
}

static int pwrap_write(struct pmic_wrapper *wrp, u32 adr, u32 wdata)
{
	int ret;

	ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_idle);
	if (ret) {
		pwrap_leave_fsm_vldclr(wrp);
		return ret;
	}

	pwrap_writel(wrp, (1 << 31) | ((adr >> 1) << 16) | wdata,
			PWRAP_WACS2_CMD);

	return 0;
}

static int pwrap_read(struct pmic_wrapper *wrp, u32 adr, u32 *rdata)
{
	int ret;

	ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_idle);
	if (ret) {
		pwrap_leave_fsm_vldclr(wrp);
		return ret;
	}

	pwrap_writel(wrp, (adr >> 1) << 16, PWRAP_WACS2_CMD);

	ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_vldclr);
	if (ret)
		return ret;

	*rdata = PWRAP_GET_WACS_RDATA(pwrap_readl(wrp, PWRAP_WACS2_RDATA));

	pwrap_writel(wrp, 1, PWRAP_WACS2_VLDCLR);

	return 0;
}

static int pwrap_regmap_read(void *context, u32 adr, u32 *rdata)
{
	return pwrap_read(context, adr, rdata);
}

static int pwrap_regmap_write(void *context, u32 adr, u32 wdata)
{
	return pwrap_write(context, adr, wdata);
}

static int pwrap_reset_spislave(struct pmic_wrapper *wrp)
{
	int ret, i;

	pwrap_writel(wrp, 0, PWRAP_HIPRIO_ARB_EN);
	pwrap_writel(wrp, 0, PWRAP_WRAP_EN);
	pwrap_writel(wrp, 1, PWRAP_MUX_SEL);
	pwrap_writel(wrp, 1, PWRAP_MAN_EN);
	pwrap_writel(wrp, 0, PWRAP_DIO_EN);

	pwrap_writel(wrp, PWRAP_MAN_CMD_SPI_WRITE | PWRAP_MAN_CMD_OP_CSL,
			PWRAP_MAN_CMD);
	pwrap_writel(wrp, PWRAP_MAN_CMD_SPI_WRITE | PWRAP_MAN_CMD_OP_OUTS,
			PWRAP_MAN_CMD);
	pwrap_writel(wrp, PWRAP_MAN_CMD_SPI_WRITE | PWRAP_MAN_CMD_OP_CSH,
			PWRAP_MAN_CMD);

	for (i = 0; i < 4; i++)
		pwrap_writel(wrp, PWRAP_MAN_CMD_SPI_WRITE | PWRAP_MAN_CMD_OP_OUTS,
				PWRAP_MAN_CMD);

	ret = pwrap_wait_for_state(wrp, pwrap_is_sync_idle);
	if (ret) {
		dev_err(wrp->dev, "%s fail, ret=%d\n", __func__, ret);
		return ret;
	}

	pwrap_writel(wrp, 0, PWRAP_MAN_EN);
	pwrap_writel(wrp, 0, PWRAP_MUX_SEL);

	return 0;
}

/*
 * pwrap_init_sidly - configure serial input delay
 *
 * This configures the serial input delay. We can configure 0, 2, 4 or 6ns
 * delay. Do a read test with all possible values and chose the best delay.
 */
static int pwrap_init_sidly(struct pmic_wrapper *wrp)
{
	u32 rdata;
	u32 i;
	u32 pass = 0;
	signed char dly[16] = {
		-1, 0, 1, 0, 2, -1, 1, 1, 3, -1, -1, -1, 3, -1, 2, 1
	};

	for (i = 0; i < 4; i++) {
		pwrap_writel(wrp, i, PWRAP_SIDLY);
		pwrap_read(wrp, PWRAP_DEW_READ_TEST, &rdata);
		if (rdata == PWRAP_DEW_READ_TEST_VAL) {
			dev_dbg(wrp->dev, "[Read Test] pass, SIDLY=%x\n", i);
			pass |= 1 << i;
		}
	}

	if (dly[pass] < 0) {
		dev_err(wrp->dev, "sidly pass range 0x%x not continuous\n",
				pass);
		return -EIO;
	}

	pwrap_writel(wrp, dly[pass], PWRAP_SIDLY);

	return 0;
}

static int pwrap_init_reg_clock(struct pmic_wrapper *wrp)
{
	if (pwrap_is_mt8135(wrp)) {
		pwrap_writel(wrp, 0x4, PWRAP_CSHEXT);
		pwrap_writel(wrp, 0x0, PWRAP_CSHEXT_WRITE);
		pwrap_writel(wrp, 0x4, PWRAP_CSHEXT_READ);
		pwrap_writel(wrp, 0x0, PWRAP_CSLEXT_START);
		pwrap_writel(wrp, 0x0, PWRAP_CSLEXT_END);
	} else {
		pwrap_writel(wrp, 0x0, PWRAP_CSHEXT_WRITE);
		pwrap_writel(wrp, 0x4, PWRAP_CSHEXT_READ);
		pwrap_writel(wrp, 0x2, PWRAP_CSLEXT_START);
		pwrap_writel(wrp, 0x2, PWRAP_CSLEXT_END);
	}

	return 0;
}

static bool pwrap_is_cipher_ready(struct pmic_wrapper *wrp)
{
	return pwrap_readl(wrp, PWRAP_CIPHER_RDY) & 1;
}

static bool pwrap_is_pmic_cipher_ready(struct pmic_wrapper *wrp)
{
	u32 rdata;
	int ret;

	ret = pwrap_read(wrp, PWRAP_DEW_CIPHER_RDY, &rdata);
	if (ret)
		return 0;

	return rdata == 1;
}

static int pwrap_init_cipher(struct pmic_wrapper *wrp)
{
	int ret;
	u32 rdata;

	pwrap_writel(wrp, 0x1, PWRAP_CIPHER_SWRST);
	pwrap_writel(wrp, 0x0, PWRAP_CIPHER_SWRST);
	pwrap_writel(wrp, 0x1, PWRAP_CIPHER_KEY_SEL);
	pwrap_writel(wrp, 0x2, PWRAP_CIPHER_IV_SEL);

	if (pwrap_is_mt8135(wrp)) {
		pwrap_writel(wrp, 1, PWRAP_CIPHER_LOAD);
		pwrap_writel(wrp, 1, PWRAP_CIPHER_START);
	} else {
		pwrap_writel(wrp, 1, PWRAP_CIPHER_EN);
	}

	/* Config cipher mode @PMIC */
	pwrap_write(wrp, PWRAP_DEW_CIPHER_SWRST, 0x1);
	pwrap_write(wrp, PWRAP_DEW_CIPHER_SWRST, 0x0);
	pwrap_write(wrp, PWRAP_DEW_CIPHER_KEY_SEL, 0x1);
	pwrap_write(wrp, PWRAP_DEW_CIPHER_IV_SEL, 0x2);
	pwrap_write(wrp, PWRAP_DEW_CIPHER_LOAD, 0x1);
	pwrap_write(wrp, PWRAP_DEW_CIPHER_START, 0x1);

	/* wait for cipher data ready@AP */
	ret = pwrap_wait_for_state(wrp, pwrap_is_cipher_ready);
	if (ret) {
		dev_err(wrp->dev, "cipher data ready@AP fail, ret=%d\n", ret);
		return ret;
	}

	/* wait for cipher data ready@PMIC */
	ret = pwrap_wait_for_state(wrp, pwrap_is_pmic_cipher_ready);
	if (ret) {
		dev_err(wrp->dev, "timeout waiting for cipher data ready@PMIC\n");
		return ret;
	}

	/* wait for cipher mode idle */
	pwrap_write(wrp, PWRAP_DEW_CIPHER_MODE, 0x1);
	ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_idle_and_sync_idle);
	if (ret) {
		dev_err(wrp->dev, "cipher mode idle fail, ret=%d\n", ret);
		return ret;
	}

	pwrap_writel(wrp, 1, PWRAP_CIPHER_MODE);

	/* Write Test */
	if (pwrap_write(wrp, PWRAP_DEW_WRITE_TEST, PWRAP_DEW_WRITE_TEST_VAL) ||
	    pwrap_read(wrp, PWRAP_DEW_WRITE_TEST, &rdata) ||
			(rdata != PWRAP_DEW_WRITE_TEST_VAL)) {
		dev_err(wrp->dev, "rdata=0x%04X\n", rdata);
		return -EFAULT;
	}

	return 0;
}

static int pwrap_init(struct pmic_wrapper *wrp)
{
	int ret;
	u32 rdata;

	reset_control_reset(wrp->rstc);
	if (wrp->rstc_bridge)
		reset_control_reset(wrp->rstc_bridge);

	if (pwrap_is_mt8173(wrp)) {
		/* Enable DCM */
		pwrap_writel(wrp, 3, PWRAP_DCM_EN);
		pwrap_writel(wrp, 0, PWRAP_DCM_DBC_PRD);
	}

	/* Reset SPI slave */
	ret = pwrap_reset_spislave(wrp);
	if (ret)
		return ret;

	pwrap_writel(wrp, 1, PWRAP_WRAP_EN);

	pwrap_writel(wrp, wrp->arb_en_all, PWRAP_HIPRIO_ARB_EN);

	pwrap_writel(wrp, 1, PWRAP_WACS2_EN);

	ret = pwrap_init_reg_clock(wrp);
	if (ret)
		return ret;

	/* Setup serial input delay */
	ret = pwrap_init_sidly(wrp);
	if (ret)
		return ret;

	/* Enable dual IO mode */
	pwrap_write(wrp, PWRAP_DEW_DIO_EN, 1);

	/* Check IDLE & INIT_DONE in advance */
	ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_idle_and_sync_idle);
	if (ret) {
		dev_err(wrp->dev, "%s fail, ret=%d\n", __func__, ret);
		return ret;
	}

	pwrap_writel(wrp, 1, PWRAP_DIO_EN);

	/* Read Test */
	pwrap_read(wrp, PWRAP_DEW_READ_TEST, &rdata);
	if (rdata != PWRAP_DEW_READ_TEST_VAL) {
		dev_err(wrp->dev, "Read test failed after switch to DIO mode: 0x%04x != 0x%04x\n",
				PWRAP_DEW_READ_TEST_VAL, rdata);
		return -EFAULT;
	}

	/* Enable encryption */
	ret = pwrap_init_cipher(wrp);
	if (ret)
		return ret;

	/* Signature checking - using CRC */
	if (pwrap_write(wrp, PWRAP_DEW_CRC_EN, 0x1))
		return -EFAULT;

	pwrap_writel(wrp, 0x1, PWRAP_CRC_EN);
	pwrap_writel(wrp, 0x0, PWRAP_SIG_MODE);
	pwrap_writel(wrp, PWRAP_DEW_CRC_VAL, PWRAP_SIG_ADR);
	pwrap_writel(wrp, wrp->arb_en_all, PWRAP_HIPRIO_ARB_EN);

	if (pwrap_is_mt8135(wrp))
		pwrap_writel(wrp, 0x7, PWRAP_RRARB_EN);

	pwrap_writel(wrp, 0x1, PWRAP_WACS0_EN);
	pwrap_writel(wrp, 0x1, PWRAP_WACS1_EN);
	pwrap_writel(wrp, 0x1, PWRAP_WACS2_EN);
	pwrap_writel(wrp, 0x5, PWRAP_STAUPD_PRD);
	pwrap_writel(wrp, 0xff, PWRAP_STAUPD_GRPEN);

	if (pwrap_is_mt8135(wrp)) {
		/* enable pwrap events and pwrap bridge in AP side */
		pwrap_writel(wrp, 0x1, PWRAP_EVENT_IN_EN);
		pwrap_writel(wrp, 0xffff, PWRAP_EVENT_DST_EN);
		writel(0x7f, wrp->bridge_base + PWRAP_MT8135_BRIDGE_IORD_ARB_EN);
		writel(0x1, wrp->bridge_base + PWRAP_MT8135_BRIDGE_WACS3_EN);
		writel(0x1, wrp->bridge_base + PWRAP_MT8135_BRIDGE_WACS4_EN);
		writel(0x1, wrp->bridge_base + PWRAP_MT8135_BRIDGE_WDT_UNIT);
		writel(0xffff, wrp->bridge_base + PWRAP_MT8135_BRIDGE_WDT_SRC_EN);
		writel(0x1, wrp->bridge_base + PWRAP_MT8135_BRIDGE_TIMER_EN);
		writel(0x7ff, wrp->bridge_base + PWRAP_MT8135_BRIDGE_INT_EN);

		/* enable PMIC event out and sources */
		if (pwrap_write(wrp, PWRAP_DEW_EVENT_OUT_EN, 0x1) ||
				pwrap_write(wrp, PWRAP_DEW_EVENT_SRC_EN, 0xffff)) {
			dev_err(wrp->dev, "enable dewrap fail\n");
			return -EFAULT;
		}
	} else {
		/* PMIC_DEWRAP enables */
		if (pwrap_write(wrp, PWRAP_DEW_EVENT_OUT_EN, 0x1) ||
				pwrap_write(wrp, PWRAP_DEW_EVENT_SRC_EN, 0xffff)) {
			dev_err(wrp->dev, "enable dewrap fail\n");
			return -EFAULT;
		}
	}

	/* Setup the init done registers */
	pwrap_writel(wrp, 1, PWRAP_INIT_DONE2);
	pwrap_writel(wrp, 1, PWRAP_INIT_DONE0);
	pwrap_writel(wrp, 1, PWRAP_INIT_DONE1);

	if (pwrap_is_mt8135(wrp)) {
		writel(1, wrp->bridge_base + PWRAP_MT8135_BRIDGE_INIT_DONE3);
		writel(1, wrp->bridge_base + PWRAP_MT8135_BRIDGE_INIT_DONE4);
	}

	return 0;
}

static irqreturn_t pwrap_interrupt(int irqno, void *dev_id)
{
	u32 rdata;
	struct pmic_wrapper *wrp = dev_id;

	rdata = pwrap_readl(wrp, PWRAP_INT_FLG);

	dev_err(wrp->dev, "unexpected interrupt int=0x%x\n", rdata);

	pwrap_writel(wrp, 0xffffffff, PWRAP_INT_CLR);

	return IRQ_HANDLED;
}

static const struct regmap_config pwrap_regmap_config = {
	.reg_bits = 16,
	.val_bits = 16,
	.reg_stride = 2,
	.reg_read = pwrap_regmap_read,
	.reg_write = pwrap_regmap_write,
	.max_register = 0xffff,
};

static struct of_device_id of_pwrap_match_tbl[] = {
	{
		.compatible = "mediatek,mt8135-pwrap",
		.data = &pwrap_mt8135,
	}, {
		.compatible = "mediatek,mt8173-pwrap",
		.data = &pwrap_mt8173,
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(of, of_pwrap_match_tbl);

static int pwrap_probe(struct platform_device *pdev)
{
	int ret, irq, wdt_src;
	struct pmic_wrapper *wrp;
	struct device_node *np = pdev->dev.of_node;
	const struct of_device_id *of_id =
		of_match_device(of_pwrap_match_tbl, &pdev->dev);
	const struct pmic_wrapper_type *type;
	struct resource *res;

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

	platform_set_drvdata(pdev, wrp);

	type = of_id->data;
	wrp->regs = type->regs;
	wrp->type = type->type;
	wrp->arb_en_all = type->arb_en_all;
	wrp->dev = &pdev->dev;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwrap");
	wrp->base = devm_ioremap_resource(wrp->dev, res);
	if (IS_ERR(wrp->base))
		return PTR_ERR(wrp->base);

	wrp->rstc = devm_reset_control_get(wrp->dev, "pwrap");
	if (IS_ERR(wrp->rstc)) {
		ret = PTR_ERR(wrp->rstc);
		dev_dbg(wrp->dev, "cannot get pwrap reset: %d\n", ret);
		return ret;
	}

	if (pwrap_is_mt8135(wrp)) {
		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
				"pwrap-bridge");
		wrp->bridge_base = devm_ioremap_resource(wrp->dev, res);
		if (IS_ERR(wrp->bridge_base))
			return PTR_ERR(wrp->bridge_base);

		wrp->rstc_bridge = devm_reset_control_get(wrp->dev, "pwrap-bridge");
		if (IS_ERR(wrp->rstc_bridge)) {
			ret = PTR_ERR(wrp->rstc_bridge);
			dev_dbg(wrp->dev, "cannot get pwrap-bridge reset: %d\n", ret);
			return ret;
		}
	}

	wrp->clk_spi = devm_clk_get(wrp->dev, "spi");
	if (IS_ERR(wrp->clk_spi)) {
		dev_dbg(wrp->dev, "failed to get clock: %ld\n", PTR_ERR(wrp->clk_spi));
		return PTR_ERR(wrp->clk_spi);
	}

	wrp->clk_wrap = devm_clk_get(wrp->dev, "wrap");
	if (IS_ERR(wrp->clk_wrap)) {
		dev_dbg(wrp->dev, "failed to get clock: %ld\n", PTR_ERR(wrp->clk_wrap));
		return PTR_ERR(wrp->clk_wrap);
	}

	ret = clk_prepare_enable(wrp->clk_spi);
	if (ret)
		return ret;

	ret = clk_prepare_enable(wrp->clk_wrap);
	if (ret)
		goto err_out1;

	/* Enable internal dynamic clock */
	pwrap_writel(wrp, 1, PWRAP_DCM_EN);
	pwrap_writel(wrp, 0, PWRAP_DCM_DBC_PRD);

	/*
	 * The PMIC could already be initialized by the bootloader.
	 * Skip initialization here in this case.
	 */
	if (!pwrap_readl(wrp, PWRAP_INIT_DONE2)) {
		ret = pwrap_init(wrp);
		if (ret) {
			dev_dbg(wrp->dev, "init failed with %d\n", ret);
			goto err_out2;
		}
	}

	if (!(pwrap_readl(wrp, PWRAP_WACS2_RDATA) & PWRAP_STATE_INIT_DONE0)) {
		dev_dbg(wrp->dev, "initialization isn't finished\n");
		return -ENODEV;
	}

	/* Initialize watchdog, may not be done by the bootloader */
	pwrap_writel(wrp, 0xf, PWRAP_WDT_UNIT);
	/*
	 * Since STAUPD was not used on mt8173 platform,
	 * so STAUPD of WDT_SRC which should be turned off
	 */
	wdt_src = pwrap_is_mt8173(wrp) ?
			PWRAP_WDT_SRC_MASK_NO_STAUPD : PWRAP_WDT_SRC_MASK_ALL;
	pwrap_writel(wrp, wdt_src, PWRAP_WDT_SRC_EN);
	pwrap_writel(wrp, 0x1, PWRAP_TIMER_EN);
	pwrap_writel(wrp, ~((1 << 31) | (1 << 1)), PWRAP_INT_EN);

	irq = platform_get_irq(pdev, 0);
	ret = devm_request_irq(wrp->dev, irq, pwrap_interrupt, IRQF_TRIGGER_HIGH,
			"mt-pmic-pwrap", wrp);
	if (ret)
		goto err_out2;

	wrp->regmap = devm_regmap_init(wrp->dev, NULL, wrp, &pwrap_regmap_config);
	if (IS_ERR(wrp->regmap))
		return PTR_ERR(wrp->regmap);

	ret = of_platform_populate(np, NULL, NULL, wrp->dev);
	if (ret) {
		dev_dbg(wrp->dev, "failed to create child devices at %s\n",
				np->full_name);
		goto err_out2;
	}

	return 0;

err_out2:
	clk_disable_unprepare(wrp->clk_wrap);
err_out1:
	clk_disable_unprepare(wrp->clk_spi);

	return ret;
}

static struct platform_driver pwrap_drv = {
	.driver = {
		.name = "mt-pmic-pwrap",
		.of_match_table = of_match_ptr(of_pwrap_match_tbl),
	},
	.probe = pwrap_probe,
};

module_platform_driver(pwrap_drv);

MODULE_AUTHOR("Flora Fu, MediaTek");
MODULE_DESCRIPTION("MediaTek MT8135 PMIC Wrapper Driver");
MODULE_LICENSE("GPL v2");