/*
 * Copyright (C) STMicroelectronics 2009
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License v2
 * Author: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
 * Author: Sundar Iyer <sundar.iyer@stericsson.com>
 * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com>
 *
 * U8500 PRCM Unit interface driver
 *
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/completion.h>
#include <linux/irq.h>
#include <linux/jiffies.h>
#include <linux/bitops.h>
#include <linux/fs.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/mfd/core.h>
#include <linux/mfd/dbx500-prcmu.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/regulator/db8500-prcmu.h>
#include <linux/regulator/machine.h>
#include <asm/hardware/gic.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
#include <mach/db8500-regs.h>
#include <mach/id.h>
#include "dbx500-prcmu-regs.h"

/* Offset for the firmware version within the TCPM */
#define PRCMU_FW_VERSION_OFFSET 0xA4

/* Index of different voltages to be used when accessing AVSData */
#define PRCM_AVS_BASE           0x2FC
#define PRCM_AVS_VBB_RET        (PRCM_AVS_BASE + 0x0)
#define PRCM_AVS_VBB_MAX_OPP    (PRCM_AVS_BASE + 0x1)
#define PRCM_AVS_VBB_100_OPP    (PRCM_AVS_BASE + 0x2)
#define PRCM_AVS_VBB_50_OPP     (PRCM_AVS_BASE + 0x3)
#define PRCM_AVS_VARM_MAX_OPP   (PRCM_AVS_BASE + 0x4)
#define PRCM_AVS_VARM_100_OPP   (PRCM_AVS_BASE + 0x5)
#define PRCM_AVS_VARM_50_OPP    (PRCM_AVS_BASE + 0x6)
#define PRCM_AVS_VARM_RET       (PRCM_AVS_BASE + 0x7)
#define PRCM_AVS_VAPE_100_OPP   (PRCM_AVS_BASE + 0x8)
#define PRCM_AVS_VAPE_50_OPP    (PRCM_AVS_BASE + 0x9)
#define PRCM_AVS_VMOD_100_OPP   (PRCM_AVS_BASE + 0xA)
#define PRCM_AVS_VMOD_50_OPP    (PRCM_AVS_BASE + 0xB)
#define PRCM_AVS_VSAFE          (PRCM_AVS_BASE + 0xC)

#define PRCM_AVS_VOLTAGE                0
#define PRCM_AVS_VOLTAGE_MASK           0x3f
#define PRCM_AVS_ISSLOWSTARTUP          6
#define PRCM_AVS_ISSLOWSTARTUP_MASK     (1 << PRCM_AVS_ISSLOWSTARTUP)
#define PRCM_AVS_ISMODEENABLE           7
#define PRCM_AVS_ISMODEENABLE_MASK      (1 << PRCM_AVS_ISMODEENABLE)

#define PRCM_BOOT_STATUS        0xFFF
#define PRCM_ROMCODE_A2P        0xFFE
#define PRCM_ROMCODE_P2A        0xFFD
#define PRCM_XP70_CUR_PWR_STATE 0xFFC      /* 4 BYTES */

#define PRCM_SW_RST_REASON 0xFF8 /* 2 bytes */

#define _PRCM_MBOX_HEADER               0xFE8 /* 16 bytes */
#define PRCM_MBOX_HEADER_REQ_MB0        (_PRCM_MBOX_HEADER + 0x0)
#define PRCM_MBOX_HEADER_REQ_MB1        (_PRCM_MBOX_HEADER + 0x1)
#define PRCM_MBOX_HEADER_REQ_MB2        (_PRCM_MBOX_HEADER + 0x2)
#define PRCM_MBOX_HEADER_REQ_MB3        (_PRCM_MBOX_HEADER + 0x3)
#define PRCM_MBOX_HEADER_REQ_MB4        (_PRCM_MBOX_HEADER + 0x4)
#define PRCM_MBOX_HEADER_REQ_MB5        (_PRCM_MBOX_HEADER + 0x5)
#define PRCM_MBOX_HEADER_ACK_MB0        (_PRCM_MBOX_HEADER + 0x8)

/* Req Mailboxes */
#define PRCM_REQ_MB0 0xFDC /* 12 bytes  */
#define PRCM_REQ_MB1 0xFD0 /* 12 bytes  */
#define PRCM_REQ_MB2 0xFC0 /* 16 bytes  */
#define PRCM_REQ_MB3 0xE4C /* 372 bytes  */
#define PRCM_REQ_MB4 0xE48 /* 4 bytes  */
#define PRCM_REQ_MB5 0xE44 /* 4 bytes  */

/* Ack Mailboxes */
#define PRCM_ACK_MB0 0xE08 /* 52 bytes  */
#define PRCM_ACK_MB1 0xE04 /* 4 bytes */
#define PRCM_ACK_MB2 0xE00 /* 4 bytes */
#define PRCM_ACK_MB3 0xDFC /* 4 bytes */
#define PRCM_ACK_MB4 0xDF8 /* 4 bytes */
#define PRCM_ACK_MB5 0xDF4 /* 4 bytes */

/* Mailbox 0 headers */
#define MB0H_POWER_STATE_TRANS          0
#define MB0H_CONFIG_WAKEUPS_EXE         1
#define MB0H_READ_WAKEUP_ACK            3
#define MB0H_CONFIG_WAKEUPS_SLEEP       4

#define MB0H_WAKEUP_EXE 2
#define MB0H_WAKEUP_SLEEP 5

/* Mailbox 0 REQs */
#define PRCM_REQ_MB0_AP_POWER_STATE     (PRCM_REQ_MB0 + 0x0)
#define PRCM_REQ_MB0_AP_PLL_STATE       (PRCM_REQ_MB0 + 0x1)
#define PRCM_REQ_MB0_ULP_CLOCK_STATE    (PRCM_REQ_MB0 + 0x2)
#define PRCM_REQ_MB0_DO_NOT_WFI         (PRCM_REQ_MB0 + 0x3)
#define PRCM_REQ_MB0_WAKEUP_8500        (PRCM_REQ_MB0 + 0x4)
#define PRCM_REQ_MB0_WAKEUP_4500        (PRCM_REQ_MB0 + 0x8)

/* Mailbox 0 ACKs */
#define PRCM_ACK_MB0_AP_PWRSTTR_STATUS  (PRCM_ACK_MB0 + 0x0)
#define PRCM_ACK_MB0_READ_POINTER       (PRCM_ACK_MB0 + 0x1)
#define PRCM_ACK_MB0_WAKEUP_0_8500      (PRCM_ACK_MB0 + 0x4)
#define PRCM_ACK_MB0_WAKEUP_0_4500      (PRCM_ACK_MB0 + 0x8)
#define PRCM_ACK_MB0_WAKEUP_1_8500      (PRCM_ACK_MB0 + 0x1C)
#define PRCM_ACK_MB0_WAKEUP_1_4500      (PRCM_ACK_MB0 + 0x20)
#define PRCM_ACK_MB0_EVENT_4500_NUMBERS 20

/* Mailbox 1 headers */
#define MB1H_ARM_APE_OPP 0x0
#define MB1H_RESET_MODEM 0x2
#define MB1H_REQUEST_APE_OPP_100_VOLT 0x3
#define MB1H_RELEASE_APE_OPP_100_VOLT 0x4
#define MB1H_RELEASE_USB_WAKEUP 0x5
#define MB1H_PLL_ON_OFF 0x6

/* Mailbox 1 Requests */
#define PRCM_REQ_MB1_ARM_OPP                    (PRCM_REQ_MB1 + 0x0)
#define PRCM_REQ_MB1_APE_OPP                    (PRCM_REQ_MB1 + 0x1)
#define PRCM_REQ_MB1_PLL_ON_OFF                 (PRCM_REQ_MB1 + 0x4)
#define PLL_SOC0_OFF    0x1
#define PLL_SOC0_ON     0x2
#define PLL_SOC1_OFF    0x4
#define PLL_SOC1_ON     0x8

/* Mailbox 1 ACKs */
#define PRCM_ACK_MB1_CURRENT_ARM_OPP    (PRCM_ACK_MB1 + 0x0)
#define PRCM_ACK_MB1_CURRENT_APE_OPP    (PRCM_ACK_MB1 + 0x1)
#define PRCM_ACK_MB1_APE_VOLTAGE_STATUS (PRCM_ACK_MB1 + 0x2)
#define PRCM_ACK_MB1_DVFS_STATUS        (PRCM_ACK_MB1 + 0x3)

/* Mailbox 2 headers */
#define MB2H_DPS        0x0
#define MB2H_AUTO_PWR   0x1

/* Mailbox 2 REQs */
#define PRCM_REQ_MB2_SVA_MMDSP          (PRCM_REQ_MB2 + 0x0)
#define PRCM_REQ_MB2_SVA_PIPE           (PRCM_REQ_MB2 + 0x1)
#define PRCM_REQ_MB2_SIA_MMDSP          (PRCM_REQ_MB2 + 0x2)
#define PRCM_REQ_MB2_SIA_PIPE           (PRCM_REQ_MB2 + 0x3)
#define PRCM_REQ_MB2_SGA                (PRCM_REQ_MB2 + 0x4)
#define PRCM_REQ_MB2_B2R2_MCDE          (PRCM_REQ_MB2 + 0x5)
#define PRCM_REQ_MB2_ESRAM12            (PRCM_REQ_MB2 + 0x6)
#define PRCM_REQ_MB2_ESRAM34            (PRCM_REQ_MB2 + 0x7)
#define PRCM_REQ_MB2_AUTO_PM_SLEEP      (PRCM_REQ_MB2 + 0x8)
#define PRCM_REQ_MB2_AUTO_PM_IDLE       (PRCM_REQ_MB2 + 0xC)

/* Mailbox 2 ACKs */
#define PRCM_ACK_MB2_DPS_STATUS (PRCM_ACK_MB2 + 0x0)
#define HWACC_PWR_ST_OK 0xFE

/* Mailbox 3 headers */
#define MB3H_ANC        0x0
#define MB3H_SIDETONE   0x1
#define MB3H_SYSCLK     0xE

/* Mailbox 3 Requests */
#define PRCM_REQ_MB3_ANC_FIR_COEFF      (PRCM_REQ_MB3 + 0x0)
#define PRCM_REQ_MB3_ANC_IIR_COEFF      (PRCM_REQ_MB3 + 0x20)
#define PRCM_REQ_MB3_ANC_SHIFTER        (PRCM_REQ_MB3 + 0x60)
#define PRCM_REQ_MB3_ANC_WARP           (PRCM_REQ_MB3 + 0x64)
#define PRCM_REQ_MB3_SIDETONE_FIR_GAIN  (PRCM_REQ_MB3 + 0x68)
#define PRCM_REQ_MB3_SIDETONE_FIR_COEFF (PRCM_REQ_MB3 + 0x6C)
#define PRCM_REQ_MB3_SYSCLK_MGT         (PRCM_REQ_MB3 + 0x16C)

/* Mailbox 4 headers */
#define MB4H_DDR_INIT   0x0
#define MB4H_MEM_ST     0x1
#define MB4H_HOTDOG     0x12
#define MB4H_HOTMON     0x13
#define MB4H_HOT_PERIOD 0x14
#define MB4H_A9WDOG_CONF 0x16
#define MB4H_A9WDOG_EN   0x17
#define MB4H_A9WDOG_DIS  0x18
#define MB4H_A9WDOG_LOAD 0x19
#define MB4H_A9WDOG_KICK 0x20

/* Mailbox 4 Requests */
#define PRCM_REQ_MB4_DDR_ST_AP_SLEEP_IDLE       (PRCM_REQ_MB4 + 0x0)
#define PRCM_REQ_MB4_DDR_ST_AP_DEEP_IDLE        (PRCM_REQ_MB4 + 0x1)
#define PRCM_REQ_MB4_ESRAM0_ST                  (PRCM_REQ_MB4 + 0x3)
#define PRCM_REQ_MB4_HOTDOG_THRESHOLD           (PRCM_REQ_MB4 + 0x0)
#define PRCM_REQ_MB4_HOTMON_LOW                 (PRCM_REQ_MB4 + 0x0)
#define PRCM_REQ_MB4_HOTMON_HIGH                (PRCM_REQ_MB4 + 0x1)
#define PRCM_REQ_MB4_HOTMON_CONFIG              (PRCM_REQ_MB4 + 0x2)
#define PRCM_REQ_MB4_HOT_PERIOD                 (PRCM_REQ_MB4 + 0x0)
#define HOTMON_CONFIG_LOW                       BIT(0)
#define HOTMON_CONFIG_HIGH                      BIT(1)
#define PRCM_REQ_MB4_A9WDOG_0                   (PRCM_REQ_MB4 + 0x0)
#define PRCM_REQ_MB4_A9WDOG_1                   (PRCM_REQ_MB4 + 0x1)
#define PRCM_REQ_MB4_A9WDOG_2                   (PRCM_REQ_MB4 + 0x2)
#define PRCM_REQ_MB4_A9WDOG_3                   (PRCM_REQ_MB4 + 0x3)
#define A9WDOG_AUTO_OFF_EN                      BIT(7)
#define A9WDOG_AUTO_OFF_DIS                     0
#define A9WDOG_ID_MASK                          0xf

/* Mailbox 5 Requests */
#define PRCM_REQ_MB5_I2C_SLAVE_OP       (PRCM_REQ_MB5 + 0x0)
#define PRCM_REQ_MB5_I2C_HW_BITS        (PRCM_REQ_MB5 + 0x1)
#define PRCM_REQ_MB5_I2C_REG            (PRCM_REQ_MB5 + 0x2)
#define PRCM_REQ_MB5_I2C_VAL            (PRCM_REQ_MB5 + 0x3)
#define PRCMU_I2C_WRITE(slave) \
        (((slave) << 1) | (cpu_is_u8500v2() ? BIT(6) : 0))
#define PRCMU_I2C_READ(slave) \
        (((slave) << 1) | BIT(0) | (cpu_is_u8500v2() ? BIT(6) : 0))
#define PRCMU_I2C_STOP_EN               BIT(3)

/* Mailbox 5 ACKs */
#define PRCM_ACK_MB5_I2C_STATUS (PRCM_ACK_MB5 + 0x1)
#define PRCM_ACK_MB5_I2C_VAL    (PRCM_ACK_MB5 + 0x3)
#define I2C_WR_OK 0x1
#define I2C_RD_OK 0x2

#define NUM_MB 8
#define MBOX_BIT BIT
#define ALL_MBOX_BITS (MBOX_BIT(NUM_MB) - 1)

/*
 * Wakeups/IRQs
 */

#define WAKEUP_BIT_RTC BIT(0)
#define WAKEUP_BIT_RTT0 BIT(1)
#define WAKEUP_BIT_RTT1 BIT(2)
#define WAKEUP_BIT_HSI0 BIT(3)
#define WAKEUP_BIT_HSI1 BIT(4)
#define WAKEUP_BIT_CA_WAKE BIT(5)
#define WAKEUP_BIT_USB BIT(6)
#define WAKEUP_BIT_ABB BIT(7)
#define WAKEUP_BIT_ABB_FIFO BIT(8)
#define WAKEUP_BIT_SYSCLK_OK BIT(9)
#define WAKEUP_BIT_CA_SLEEP BIT(10)
#define WAKEUP_BIT_AC_WAKE_ACK BIT(11)
#define WAKEUP_BIT_SIDE_TONE_OK BIT(12)
#define WAKEUP_BIT_ANC_OK BIT(13)
#define WAKEUP_BIT_SW_ERROR BIT(14)
#define WAKEUP_BIT_AC_SLEEP_ACK BIT(15)
#define WAKEUP_BIT_ARM BIT(17)
#define WAKEUP_BIT_HOTMON_LOW BIT(18)
#define WAKEUP_BIT_HOTMON_HIGH BIT(19)
#define WAKEUP_BIT_MODEM_SW_RESET_REQ BIT(20)
#define WAKEUP_BIT_GPIO0 BIT(23)
#define WAKEUP_BIT_GPIO1 BIT(24)
#define WAKEUP_BIT_GPIO2 BIT(25)
#define WAKEUP_BIT_GPIO3 BIT(26)
#define WAKEUP_BIT_GPIO4 BIT(27)
#define WAKEUP_BIT_GPIO5 BIT(28)
#define WAKEUP_BIT_GPIO6 BIT(29)
#define WAKEUP_BIT_GPIO7 BIT(30)
#define WAKEUP_BIT_GPIO8 BIT(31)

static struct {
        bool valid;
        struct prcmu_fw_version version;
} fw_info;

static struct irq_domain *db8500_irq_domain;

/*
 * This vector maps irq numbers to the bits in the bit field used in
 * communication with the PRCMU firmware.
 *
 * The reason for having this is to keep the irq numbers contiguous even though
 * the bits in the bit field are not. (The bits also have a tendency to move
 * around, to further complicate matters.)
 */
#define IRQ_INDEX(_name) ((IRQ_PRCMU_##_name) - IRQ_PRCMU_BASE)
#define IRQ_ENTRY(_name)[IRQ_INDEX(_name)] = (WAKEUP_BIT_##_name)
static u32 prcmu_irq_bit[NUM_PRCMU_WAKEUPS] = {
        IRQ_ENTRY(RTC),
        IRQ_ENTRY(RTT0),
        IRQ_ENTRY(RTT1),
        IRQ_ENTRY(HSI0),
        IRQ_ENTRY(HSI1),
        IRQ_ENTRY(CA_WAKE),
        IRQ_ENTRY(USB),
        IRQ_ENTRY(ABB),
        IRQ_ENTRY(ABB_FIFO),
        IRQ_ENTRY(CA_SLEEP),
        IRQ_ENTRY(ARM),
        IRQ_ENTRY(HOTMON_LOW),
        IRQ_ENTRY(HOTMON_HIGH),
        IRQ_ENTRY(MODEM_SW_RESET_REQ),
        IRQ_ENTRY(GPIO0),
        IRQ_ENTRY(GPIO1),
        IRQ_ENTRY(GPIO2),
        IRQ_ENTRY(GPIO3),
        IRQ_ENTRY(GPIO4),
        IRQ_ENTRY(GPIO5),
        IRQ_ENTRY(GPIO6),
        IRQ_ENTRY(GPIO7),
        IRQ_ENTRY(GPIO8)
};

#define VALID_WAKEUPS (BIT(NUM_PRCMU_WAKEUP_INDICES) - 1)
#define WAKEUP_ENTRY(_name)[PRCMU_WAKEUP_INDEX_##_name] = (WAKEUP_BIT_##_name)
static u32 prcmu_wakeup_bit[NUM_PRCMU_WAKEUP_INDICES] = {
        WAKEUP_ENTRY(RTC),
        WAKEUP_ENTRY(RTT0),
        WAKEUP_ENTRY(RTT1),
        WAKEUP_ENTRY(HSI0),
        WAKEUP_ENTRY(HSI1),
        WAKEUP_ENTRY(USB),
        WAKEUP_ENTRY(ABB),
        WAKEUP_ENTRY(ABB_FIFO),
        WAKEUP_ENTRY(ARM)
};

/*
 * mb0_transfer - state needed for mailbox 0 communication.
 * @lock:               The transaction lock.
 * @dbb_events_lock:    A lock used to handle concurrent access to (parts of)
 *                      the request data.
 * @mask_work:          Work structure used for (un)masking wakeup interrupts.
 * @req:                Request data that need to persist between requests.
 */
static struct {
        spinlock_t lock;
        spinlock_t dbb_irqs_lock;
        struct work_struct mask_work;
        struct mutex ac_wake_lock;
        struct completion ac_wake_work;
        struct {
                u32 dbb_irqs;
                u32 dbb_wakeups;
                u32 abb_events;
        } req;
} mb0_transfer;

/*
 * mb1_transfer - state needed for mailbox 1 communication.
 * @lock:       The transaction lock.
 * @work:       The transaction completion structure.
 * @ape_opp:    The current APE OPP.
 * @ack:        Reply ("acknowledge") data.
 */
static struct {
        struct mutex lock;
        struct completion work;
        u8 ape_opp;
        struct {
                u8 header;
                u8 arm_opp;
                u8 ape_opp;
                u8 ape_voltage_status;
        } ack;
} mb1_transfer;

/*
 * mb2_transfer - state needed for mailbox 2 communication.
 * @lock:            The transaction lock.
 * @work:            The transaction completion structure.
 * @auto_pm_lock:    The autonomous power management configuration lock.
 * @auto_pm_enabled: A flag indicating whether autonomous PM is enabled.
 * @req:             Request data that need to persist between requests.
 * @ack:             Reply ("acknowledge") data.
 */
static struct {
        struct mutex lock;
        struct completion work;
        spinlock_t auto_pm_lock;
        bool auto_pm_enabled;
        struct {
                u8 status;
        } ack;
} mb2_transfer;

/*
 * mb3_transfer - state needed for mailbox 3 communication.
 * @lock:               The request lock.
 * @sysclk_lock:        A lock used to handle concurrent sysclk requests.
 * @sysclk_work:        Work structure used for sysclk requests.
 */
static struct {
        spinlock_t lock;
        struct mutex sysclk_lock;
        struct completion sysclk_work;
} mb3_transfer;

/*
 * mb4_transfer - state needed for mailbox 4 communication.
 * @lock:       The transaction lock.
 * @work:       The transaction completion structure.
 */
static struct {
        struct mutex lock;
        struct completion work;
} mb4_transfer;

/*
 * mb5_transfer - state needed for mailbox 5 communication.
 * @lock:       The transaction lock.
 * @work:       The transaction completion structure.
 * @ack:        Reply ("acknowledge") data.
 */
static struct {
        struct mutex lock;
        struct completion work;
        struct {
                u8 status;
                u8 value;
        } ack;
} mb5_transfer;

static atomic_t ac_wake_req_state = ATOMIC_INIT(0);

/* Functions definition */
static void compute_armss_rate(void);

/* Spinlocks */
static DEFINE_SPINLOCK(prcmu_lock);
static DEFINE_SPINLOCK(clkout_lock);

/* Global var to runtime determine TCDM base for v2 or v1 */
static __iomem void *tcdm_base;

struct clk_mgt {
        void __iomem *reg;
        u32 pllsw;
        int branch;
        bool clk38div;
};

enum {
        PLL_RAW,
        PLL_FIX,
        PLL_DIV
};

static DEFINE_SPINLOCK(clk_mgt_lock);

#define CLK_MGT_ENTRY(_name, _branch, _clk38div)[PRCMU_##_name] = \
        { (PRCM_##_name##_MGT), 0 , _branch, _clk38div}
struct clk_mgt clk_mgt[PRCMU_NUM_REG_CLOCKS] = {
        CLK_MGT_ENTRY(SGACLK, PLL_DIV, false),
        CLK_MGT_ENTRY(UARTCLK, PLL_FIX, true),
        CLK_MGT_ENTRY(MSP02CLK, PLL_FIX, true),
        CLK_MGT_ENTRY(MSP1CLK, PLL_FIX, true),
        CLK_MGT_ENTRY(I2CCLK, PLL_FIX, true),
        CLK_MGT_ENTRY(SDMMCCLK, PLL_DIV, true),
        CLK_MGT_ENTRY(SLIMCLK, PLL_FIX, true),
        CLK_MGT_ENTRY(PER1CLK, PLL_DIV, true),
        CLK_MGT_ENTRY(PER2CLK, PLL_DIV, true),
        CLK_MGT_ENTRY(PER3CLK, PLL_DIV, true),
        CLK_MGT_ENTRY(PER5CLK, PLL_DIV, true),
        CLK_MGT_ENTRY(PER6CLK, PLL_DIV, true),
        CLK_MGT_ENTRY(PER7CLK, PLL_DIV, true),
        CLK_MGT_ENTRY(LCDCLK, PLL_FIX, true),
        CLK_MGT_ENTRY(BMLCLK, PLL_DIV, true),
        CLK_MGT_ENTRY(HSITXCLK, PLL_DIV, true),
        CLK_MGT_ENTRY(HSIRXCLK, PLL_DIV, true),
        CLK_MGT_ENTRY(HDMICLK, PLL_FIX, false),
        CLK_MGT_ENTRY(APEATCLK, PLL_DIV, true),
        CLK_MGT_ENTRY(APETRACECLK, PLL_DIV, true),
        CLK_MGT_ENTRY(MCDECLK, PLL_DIV, true),
        CLK_MGT_ENTRY(IPI2CCLK, PLL_FIX, true),
        CLK_MGT_ENTRY(DSIALTCLK, PLL_FIX, false),
        CLK_MGT_ENTRY(DMACLK, PLL_DIV, true),
        CLK_MGT_ENTRY(B2R2CLK, PLL_DIV, true),
        CLK_MGT_ENTRY(TVCLK, PLL_FIX, true),
        CLK_MGT_ENTRY(SSPCLK, PLL_FIX, true),
        CLK_MGT_ENTRY(RNGCLK, PLL_FIX, true),
        CLK_MGT_ENTRY(UICCCLK, PLL_FIX, false),
};

struct dsiclk {
        u32 divsel_mask;
        u32 divsel_shift;
        u32 divsel;
};

static struct dsiclk dsiclk[2] = {
        {
                .divsel_mask = PRCM_DSI_PLLOUT_SEL_DSI0_PLLOUT_DIVSEL_MASK,
                .divsel_shift = PRCM_DSI_PLLOUT_SEL_DSI0_PLLOUT_DIVSEL_SHIFT,
                .divsel = PRCM_DSI_PLLOUT_SEL_PHI,
        },
        {
                .divsel_mask = PRCM_DSI_PLLOUT_SEL_DSI1_PLLOUT_DIVSEL_MASK,
                .divsel_shift = PRCM_DSI_PLLOUT_SEL_DSI1_PLLOUT_DIVSEL_SHIFT,
                .divsel = PRCM_DSI_PLLOUT_SEL_PHI,
        }
};

struct dsiescclk {
        u32 en;
        u32 div_mask;
        u32 div_shift;
};

static struct dsiescclk dsiescclk[3] = {
        {
                .en = PRCM_DSITVCLK_DIV_DSI0_ESC_CLK_EN,
                .div_mask = PRCM_DSITVCLK_DIV_DSI0_ESC_CLK_DIV_MASK,
                .div_shift = PRCM_DSITVCLK_DIV_DSI0_ESC_CLK_DIV_SHIFT,
        },
        {
                .en = PRCM_DSITVCLK_DIV_DSI1_ESC_CLK_EN,
                .div_mask = PRCM_DSITVCLK_DIV_DSI1_ESC_CLK_DIV_MASK,
                .div_shift = PRCM_DSITVCLK_DIV_DSI1_ESC_CLK_DIV_SHIFT,
        },
        {
                .en = PRCM_DSITVCLK_DIV_DSI2_ESC_CLK_EN,
                .div_mask = PRCM_DSITVCLK_DIV_DSI2_ESC_CLK_DIV_MASK,
                .div_shift = PRCM_DSITVCLK_DIV_DSI2_ESC_CLK_DIV_SHIFT,
        }
};


/*
* Used by MCDE to setup all necessary PRCMU registers
*/
#define PRCMU_RESET_DSIPLL              0x00004000
#define PRCMU_UNCLAMP_DSIPLL            0x00400800

#define PRCMU_CLK_PLL_DIV_SHIFT         0
#define PRCMU_CLK_PLL_SW_SHIFT          5
#define PRCMU_CLK_38                    (1 << 9)
#define PRCMU_CLK_38_SRC                (1 << 10)
#define PRCMU_CLK_38_DIV                (1 << 11)

/* PLLDIV=12, PLLSW=4 (PLLDDR) */
#define PRCMU_DSI_CLOCK_SETTING         0x0000008C

/* DPI 50000000 Hz */
#define PRCMU_DPI_CLOCK_SETTING         ((1 << PRCMU_CLK_PLL_SW_SHIFT) | \
                                          (16 << PRCMU_CLK_PLL_DIV_SHIFT))
#define PRCMU_DSI_LP_CLOCK_SETTING      0x00000E00

/* D=101, N=1, R=4, SELDIV2=0 */
#define PRCMU_PLLDSI_FREQ_SETTING       0x00040165

#define PRCMU_ENABLE_PLLDSI             0x00000001
#define PRCMU_DISABLE_PLLDSI            0x00000000
#define PRCMU_RELEASE_RESET_DSS         0x0000400C
#define PRCMU_DSI_PLLOUT_SEL_SETTING    0x00000202
/* ESC clk, div0=1, div1=1, div2=3 */
#define PRCMU_ENABLE_ESCAPE_CLOCK_DIV   0x07030101
#define PRCMU_DISABLE_ESCAPE_CLOCK_DIV  0x00030101
#define PRCMU_DSI_RESET_SW              0x00000007

#define PRCMU_PLLDSI_LOCKP_LOCKED       0x3

int db8500_prcmu_enable_dsipll(void)
{
        int i;

        /* Clear DSIPLL_RESETN */
        writel(PRCMU_RESET_DSIPLL, PRCM_APE_RESETN_CLR);
        /* Unclamp DSIPLL in/out */
        writel(PRCMU_UNCLAMP_DSIPLL, PRCM_MMIP_LS_CLAMP_CLR);

        /* Set DSI PLL FREQ */
        writel(PRCMU_PLLDSI_FREQ_SETTING, PRCM_PLLDSI_FREQ);
        writel(PRCMU_DSI_PLLOUT_SEL_SETTING, PRCM_DSI_PLLOUT_SEL);
        /* Enable Escape clocks */
        writel(PRCMU_ENABLE_ESCAPE_CLOCK_DIV, PRCM_DSITVCLK_DIV);

        /* Start DSI PLL */
        writel(PRCMU_ENABLE_PLLDSI, PRCM_PLLDSI_ENABLE);
        /* Reset DSI PLL */
        writel(PRCMU_DSI_RESET_SW, PRCM_DSI_SW_RESET);
        for (i = 0; i < 10; i++) {
                if ((readl(PRCM_PLLDSI_LOCKP) & PRCMU_PLLDSI_LOCKP_LOCKED)
                                        == PRCMU_PLLDSI_LOCKP_LOCKED)
                        break;
                udelay(100);
        }
        /* Set DSIPLL_RESETN */
        writel(PRCMU_RESET_DSIPLL, PRCM_APE_RESETN_SET);
        return 0;
}

int db8500_prcmu_disable_dsipll(void)
{
        /* Disable dsi pll */
        writel(PRCMU_DISABLE_PLLDSI, PRCM_PLLDSI_ENABLE);
        /* Disable  escapeclock */
        writel(PRCMU_DISABLE_ESCAPE_CLOCK_DIV, PRCM_DSITVCLK_DIV);
        return 0;
}

int db8500_prcmu_set_display_clocks(void)
{
        unsigned long flags;

        spin_lock_irqsave(&clk_mgt_lock, flags);

        /* Grab the HW semaphore. */
        while ((readl(PRCM_SEM) & PRCM_SEM_PRCM_SEM) != 0)
                cpu_relax();

        writel(PRCMU_DSI_CLOCK_SETTING, PRCM_HDMICLK_MGT);
        writel(PRCMU_DSI_LP_CLOCK_SETTING, PRCM_TVCLK_MGT);
        writel(PRCMU_DPI_CLOCK_SETTING, PRCM_LCDCLK_MGT);

        /* Release the HW semaphore. */
        writel(0, PRCM_SEM);

        spin_unlock_irqrestore(&clk_mgt_lock, flags);

        return 0;
}

u32 db8500_prcmu_read(unsigned int reg)
{
        return readl(_PRCMU_BASE + reg);
}

void db8500_prcmu_write(unsigned int reg, u32 value)
{
        unsigned long flags;

        spin_lock_irqsave(&prcmu_lock, flags);
        writel(value, (_PRCMU_BASE + reg));
        spin_unlock_irqrestore(&prcmu_lock, flags);
}

void db8500_prcmu_write_masked(unsigned int reg, u32 mask, u32 value)
{
        u32 val;
        unsigned long flags;

        spin_lock_irqsave(&prcmu_lock, flags);
        val = readl(_PRCMU_BASE + reg);
        val = ((val & ~mask) | (value & mask));
        writel(val, (_PRCMU_BASE + reg));
        spin_unlock_irqrestore(&prcmu_lock, flags);
}

struct prcmu_fw_version *prcmu_get_fw_version(void)
{
        return fw_info.valid ? &fw_info.version : NULL;
}

bool prcmu_has_arm_maxopp(void)
{
        return (readb(tcdm_base + PRCM_AVS_VARM_MAX_OPP) &
                PRCM_AVS_ISMODEENABLE_MASK) == PRCM_AVS_ISMODEENABLE_MASK;
}

/**
 * prcmu_get_boot_status - PRCMU boot status checking
 * Returns: the current PRCMU boot status
 */
int prcmu_get_boot_status(void)
{
        return readb(tcdm_base + PRCM_BOOT_STATUS);
}

/**
 * prcmu_set_rc_a2p - This function is used to run few power state sequences
 * @val: Value to be set, i.e. transition requested
 * Returns: 0 on success, -EINVAL on invalid argument
 *
 * This function is used to run the following power state sequences -
 * any state to ApReset,  ApDeepSleep to ApExecute, ApExecute to ApDeepSleep
 */
int prcmu_set_rc_a2p(enum romcode_write val)
{
        if (val < RDY_2_DS || val > RDY_2_XP70_RST)
                return -EINVAL;
        writeb(val, (tcdm_base + PRCM_ROMCODE_A2P));
        return 0;
}

/**
 * prcmu_get_rc_p2a - This function is used to get power state sequences
 * Returns: the power transition that has last happened
 *
 * This function can return the following transitions-
 * any state to ApReset,  ApDeepSleep to ApExecute, ApExecute to ApDeepSleep
 */
enum romcode_read prcmu_get_rc_p2a(void)
{
        return readb(tcdm_base + PRCM_ROMCODE_P2A);
}

/**
 * prcmu_get_current_mode - Return the current XP70 power mode
 * Returns: Returns the current AP(ARM) power mode: init,
 * apBoot, apExecute, apDeepSleep, apSleep, apIdle, apReset
 */
enum ap_pwrst prcmu_get_xp70_current_state(void)
{
        return readb(tcdm_base + PRCM_XP70_CUR_PWR_STATE);
}

/**
 * prcmu_config_clkout - Configure one of the programmable clock outputs.
 * @clkout:     The CLKOUT number (0 or 1).
 * @source:     The clock to be used (one of the PRCMU_CLKSRC_*).
 * @div:        The divider to be applied.
 *
 * Configures one of the programmable clock outputs (CLKOUTs).
 * @div should be in the range [1,63] to request a configuration, or 0 to
 * inform that the configuration is no longer requested.
 */
int prcmu_config_clkout(u8 clkout, u8 source, u8 div)
{
        static int requests[2];
        int r = 0;
        unsigned long flags;
        u32 val;
        u32 bits;
        u32 mask;
        u32 div_mask;

        BUG_ON(clkout > 1);
        BUG_ON(div > 63);
        BUG_ON((clkout == 0) && (source > PRCMU_CLKSRC_CLK009));

        if (!div && !requests[clkout])
                return -EINVAL;

        switch (clkout) {
        case 0:
                div_mask = PRCM_CLKOCR_CLKODIV0_MASK;
                mask = (PRCM_CLKOCR_CLKODIV0_MASK | PRCM_CLKOCR_CLKOSEL0_MASK);
                bits = ((source << PRCM_CLKOCR_CLKOSEL0_SHIFT) |
                        (div << PRCM_CLKOCR_CLKODIV0_SHIFT));
                break;
        case 1:
                div_mask = PRCM_CLKOCR_CLKODIV1_MASK;
                mask = (PRCM_CLKOCR_CLKODIV1_MASK | PRCM_CLKOCR_CLKOSEL1_MASK |
                        PRCM_CLKOCR_CLK1TYPE);
                bits = ((source << PRCM_CLKOCR_CLKOSEL1_SHIFT) |
                        (div << PRCM_CLKOCR_CLKODIV1_SHIFT));
                break;
        }
        bits &= mask;

        spin_lock_irqsave(&clkout_lock, flags);

        val = readl(PRCM_CLKOCR);
        if (val & div_mask) {
                if (div) {
                        if ((val & mask) != bits) {
                                r = -EBUSY;
                                goto unlock_and_return;
                        }
                } else {
                        if ((val & mask & ~div_mask) != bits) {
                                r = -EINVAL;
                                goto unlock_and_return;
                        }
                }
        }
        writel((bits | (val & ~mask)), PRCM_CLKOCR);
        requests[clkout] += (div ? 1 : -1);

unlock_and_return:
        spin_unlock_irqrestore(&clkout_lock, flags);

        return r;
}

int db8500_prcmu_set_power_state(u8 state, bool keep_ulp_clk, bool keep_ap_pll)
{
        unsigned long flags;

        BUG_ON((state < PRCMU_AP_SLEEP) || (PRCMU_AP_DEEP_IDLE < state));

        spin_lock_irqsave(&mb0_transfer.lock, flags);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(0))
                cpu_relax();

        writeb(MB0H_POWER_STATE_TRANS, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB0));
        writeb(state, (tcdm_base + PRCM_REQ_MB0_AP_POWER_STATE));
        writeb((keep_ap_pll ? 1 : 0), (tcdm_base + PRCM_REQ_MB0_AP_PLL_STATE));
        writeb((keep_ulp_clk ? 1 : 0),
                (tcdm_base + PRCM_REQ_MB0_ULP_CLOCK_STATE));
        writeb(0, (tcdm_base + PRCM_REQ_MB0_DO_NOT_WFI));
        writel(MBOX_BIT(0), PRCM_MBOX_CPU_SET);

        spin_unlock_irqrestore(&mb0_transfer.lock, flags);

        return 0;
}

u8 db8500_prcmu_get_power_state_result(void)
{
        return readb(tcdm_base + PRCM_ACK_MB0_AP_PWRSTTR_STATUS);
}

/* This function decouple the gic from the prcmu */
int db8500_prcmu_gic_decouple(void)
{
        u32 val = readl(PRCM_A9_MASK_REQ);

        /* Set bit 0 register value to 1 */
        writel(val | PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ,
               PRCM_A9_MASK_REQ);

        /* Make sure the register is updated */
        readl(PRCM_A9_MASK_REQ);

        /* Wait a few cycles for the gic mask completion */
        udelay(1);

        return 0;
}

/* This function recouple the gic with the prcmu */
int db8500_prcmu_gic_recouple(void)
{
        u32 val = readl(PRCM_A9_MASK_REQ);

        /* Set bit 0 register value to 0 */
        writel(val & ~PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ, PRCM_A9_MASK_REQ);

        return 0;
}

#define PRCMU_GIC_NUMBER_REGS 5

/*
 * This function checks if there are pending irq on the gic. It only
 * makes sense if the gic has been decoupled before with the
 * db8500_prcmu_gic_decouple function. Disabling an interrupt only
 * disables the forwarding of the interrupt to any CPU interface. It
 * does not prevent the interrupt from changing state, for example
 * becoming pending, or active and pending if it is already
 * active. Hence, we have to check the interrupt is pending *and* is
 * active.
 */
bool db8500_prcmu_gic_pending_irq(void)
{
        u32 pr; /* Pending register */
        u32 er; /* Enable register */
        void __iomem *dist_base = __io_address(U8500_GIC_DIST_BASE);
        int i;

        /* 5 registers. STI & PPI not skipped */
        for (i = 0; i < PRCMU_GIC_NUMBER_REGS; i++) {

                pr = readl_relaxed(dist_base + GIC_DIST_PENDING_SET + i * 4);
                er = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);

                if (pr & er)
                        return true; /* There is a pending interrupt */
        }

        return false;
}

/*
 * This function checks if there are pending interrupt on the
 * prcmu which has been delegated to monitor the irqs with the
 * db8500_prcmu_copy_gic_settings function.
 */
bool db8500_prcmu_pending_irq(void)
{
        u32 it, im;
        int i;

        for (i = 0; i < PRCMU_GIC_NUMBER_REGS - 1; i++) {
                it = readl(PRCM_ARMITVAL31TO0 + i * 4);
                im = readl(PRCM_ARMITMSK31TO0 + i * 4);
                if (it & im)
                        return true; /* There is a pending interrupt */
        }

        return false;
}

/*
 * This function checks if the specified cpu is in in WFI. It's usage
 * makes sense only if the gic is decoupled with the db8500_prcmu_gic_decouple
 * function. Of course passing smp_processor_id() to this function will
 * always return false...
 */
bool db8500_prcmu_is_cpu_in_wfi(int cpu)
{
        return readl(PRCM_ARM_WFI_STANDBY) & cpu ? PRCM_ARM_WFI_STANDBY_WFI1 :
                     PRCM_ARM_WFI_STANDBY_WFI0;
}

/*
 * This function copies the gic SPI settings to the prcmu in order to
 * monitor them and abort/finish the retention/off sequence or state.
 */
int db8500_prcmu_copy_gic_settings(void)
{
        u32 er; /* Enable register */
        void __iomem *dist_base = __io_address(U8500_GIC_DIST_BASE);
        int i;

        /* We skip the STI and PPI */
        for (i = 0; i < PRCMU_GIC_NUMBER_REGS - 1; i++) {
                er = readl_relaxed(dist_base +
                                   GIC_DIST_ENABLE_SET + (i + 1) * 4);
                writel(er, PRCM_ARMITMSK31TO0 + i * 4);
        }

        return 0;
}

/* This function should only be called while mb0_transfer.lock is held. */
static void config_wakeups(void)
{
        const u8 header[2] = {
                MB0H_CONFIG_WAKEUPS_EXE,
                MB0H_CONFIG_WAKEUPS_SLEEP
        };
        static u32 last_dbb_events;
        static u32 last_abb_events;
        u32 dbb_events;
        u32 abb_events;
        unsigned int i;

        dbb_events = mb0_transfer.req.dbb_irqs | mb0_transfer.req.dbb_wakeups;
        dbb_events |= (WAKEUP_BIT_AC_WAKE_ACK | WAKEUP_BIT_AC_SLEEP_ACK);

        abb_events = mb0_transfer.req.abb_events;

        if ((dbb_events == last_dbb_events) && (abb_events == last_abb_events))
                return;

        for (i = 0; i < 2; i++) {
                while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(0))
                        cpu_relax();
                writel(dbb_events, (tcdm_base + PRCM_REQ_MB0_WAKEUP_8500));
                writel(abb_events, (tcdm_base + PRCM_REQ_MB0_WAKEUP_4500));
                writeb(header[i], (tcdm_base + PRCM_MBOX_HEADER_REQ_MB0));
                writel(MBOX_BIT(0), PRCM_MBOX_CPU_SET);
        }
        last_dbb_events = dbb_events;
        last_abb_events = abb_events;
}

void db8500_prcmu_enable_wakeups(u32 wakeups)
{
        unsigned long flags;
        u32 bits;
        int i;

        BUG_ON(wakeups != (wakeups & VALID_WAKEUPS));

        for (i = 0, bits = 0; i < NUM_PRCMU_WAKEUP_INDICES; i++) {
                if (wakeups & BIT(i))
                        bits |= prcmu_wakeup_bit[i];
        }

        spin_lock_irqsave(&mb0_transfer.lock, flags);

        mb0_transfer.req.dbb_wakeups = bits;
        config_wakeups();

        spin_unlock_irqrestore(&mb0_transfer.lock, flags);
}

void db8500_prcmu_config_abb_event_readout(u32 abb_events)
{
        unsigned long flags;

        spin_lock_irqsave(&mb0_transfer.lock, flags);

        mb0_transfer.req.abb_events = abb_events;
        config_wakeups();

        spin_unlock_irqrestore(&mb0_transfer.lock, flags);
}

void db8500_prcmu_get_abb_event_buffer(void __iomem **buf)
{
        if (readb(tcdm_base + PRCM_ACK_MB0_READ_POINTER) & 1)
                *buf = (tcdm_base + PRCM_ACK_MB0_WAKEUP_1_4500);
        else
                *buf = (tcdm_base + PRCM_ACK_MB0_WAKEUP_0_4500);
}

/**
 * db8500_prcmu_set_arm_opp - set the appropriate ARM OPP
 * @opp: The new ARM operating point to which transition is to be made
 * Returns: 0 on success, non-zero on failure
 *
 * This function sets the the operating point of the ARM.
 */
int db8500_prcmu_set_arm_opp(u8 opp)
{
        int r;

        if (opp < ARM_NO_CHANGE || opp > ARM_EXTCLK)
                return -EINVAL;

        r = 0;

        mutex_lock(&mb1_transfer.lock);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(1))
                cpu_relax();

        writeb(MB1H_ARM_APE_OPP, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB1));
        writeb(opp, (tcdm_base + PRCM_REQ_MB1_ARM_OPP));
        writeb(APE_NO_CHANGE, (tcdm_base + PRCM_REQ_MB1_APE_OPP));

        writel(MBOX_BIT(1), PRCM_MBOX_CPU_SET);
        wait_for_completion(&mb1_transfer.work);

        if ((mb1_transfer.ack.header != MB1H_ARM_APE_OPP) ||
                (mb1_transfer.ack.arm_opp != opp))
                r = -EIO;

        compute_armss_rate();
        mutex_unlock(&mb1_transfer.lock);

        return r;
}

/**
 * db8500_prcmu_get_arm_opp - get the current ARM OPP
 *
 * Returns: the current ARM OPP
 */
int db8500_prcmu_get_arm_opp(void)
{
        return readb(tcdm_base + PRCM_ACK_MB1_CURRENT_ARM_OPP);
}

/**
 * db8500_prcmu_get_ddr_opp - get the current DDR OPP
 *
 * Returns: the current DDR OPP
 */
int db8500_prcmu_get_ddr_opp(void)
{
        return readb(PRCM_DDR_SUBSYS_APE_MINBW);
}

/**
 * db8500_set_ddr_opp - set the appropriate DDR OPP
 * @opp: The new DDR operating point to which transition is to be made
 * Returns: 0 on success, non-zero on failure
 *
 * This function sets the operating point of the DDR.
 */
int db8500_prcmu_set_ddr_opp(u8 opp)
{
        if (opp < DDR_100_OPP || opp > DDR_25_OPP)
                return -EINVAL;
        /* Changing the DDR OPP can hang the hardware pre-v21 */
        if (cpu_is_u8500v20_or_later() && !cpu_is_u8500v20())
                writeb(opp, PRCM_DDR_SUBSYS_APE_MINBW);

        return 0;
}

/* Divide the frequency of certain clocks by 2 for APE_50_PARTLY_25_OPP. */
static void request_even_slower_clocks(bool enable)
{
        void __iomem *clock_reg[] = {
                PRCM_ACLK_MGT,
                PRCM_DMACLK_MGT
        };
        unsigned long flags;
        unsigned int i;

        spin_lock_irqsave(&clk_mgt_lock, flags);

        /* Grab the HW semaphore. */
        while ((readl(PRCM_SEM) & PRCM_SEM_PRCM_SEM) != 0)
                cpu_relax();

        for (i = 0; i < ARRAY_SIZE(clock_reg); i++) {
                u32 val;
                u32 div;

                val = readl(clock_reg[i]);
                div = (val & PRCM_CLK_MGT_CLKPLLDIV_MASK);
                if (enable) {
                        if ((div <= 1) || (div > 15)) {
                                pr_err("prcmu: Bad clock divider %d in %s\n",
                                        div, __func__);
                                goto unlock_and_return;
                        }
                        div <<= 1;
                } else {
                        if (div <= 2)
                                goto unlock_and_return;
                        div >>= 1;
                }
                val = ((val & ~PRCM_CLK_MGT_CLKPLLDIV_MASK) |
                        (div & PRCM_CLK_MGT_CLKPLLDIV_MASK));
                writel(val, clock_reg[i]);
        }

unlock_and_return:
        /* Release the HW semaphore. */
        writel(0, PRCM_SEM);

        spin_unlock_irqrestore(&clk_mgt_lock, flags);
}

/**
 * db8500_set_ape_opp - set the appropriate APE OPP
 * @opp: The new APE operating point to which transition is to be made
 * Returns: 0 on success, non-zero on failure
 *
 * This function sets the operating point of the APE.
 */
int db8500_prcmu_set_ape_opp(u8 opp)
{
        int r = 0;

        if (opp == mb1_transfer.ape_opp)
                return 0;

        mutex_lock(&mb1_transfer.lock);

        if (mb1_transfer.ape_opp == APE_50_PARTLY_25_OPP)
                request_even_slower_clocks(false);

        if ((opp != APE_100_OPP) && (mb1_transfer.ape_opp != APE_100_OPP))
                goto skip_message;

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(1))
                cpu_relax();

        writeb(MB1H_ARM_APE_OPP, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB1));
        writeb(ARM_NO_CHANGE, (tcdm_base + PRCM_REQ_MB1_ARM_OPP));
        writeb(((opp == APE_50_PARTLY_25_OPP) ? APE_50_OPP : opp),
                (tcdm_base + PRCM_REQ_MB1_APE_OPP));

        writel(MBOX_BIT(1), PRCM_MBOX_CPU_SET);
        wait_for_completion(&mb1_transfer.work);

        if ((mb1_transfer.ack.header != MB1H_ARM_APE_OPP) ||
                (mb1_transfer.ack.ape_opp != opp))
                r = -EIO;

skip_message:
        if ((!r && (opp == APE_50_PARTLY_25_OPP)) ||
                (r && (mb1_transfer.ape_opp == APE_50_PARTLY_25_OPP)))
                request_even_slower_clocks(true);
        if (!r)
                mb1_transfer.ape_opp = opp;

        mutex_unlock(&mb1_transfer.lock);

        return r;
}

/**
 * db8500_prcmu_get_ape_opp - get the current APE OPP
 *
 * Returns: the current APE OPP
 */
int db8500_prcmu_get_ape_opp(void)
{
        return readb(tcdm_base + PRCM_ACK_MB1_CURRENT_APE_OPP);
}

/**
 * prcmu_request_ape_opp_100_voltage - Request APE OPP 100% voltage
 * @enable: true to request the higher voltage, false to drop a request.
 *
 * Calls to this function to enable and disable requests must be balanced.
 */
int prcmu_request_ape_opp_100_voltage(bool enable)
{
        int r = 0;
        u8 header;
        static unsigned int requests;

        mutex_lock(&mb1_transfer.lock);

        if (enable) {
                if (0 != requests++)
                        goto unlock_and_return;
                header = MB1H_REQUEST_APE_OPP_100_VOLT;
        } else {
                if (requests == 0) {
                        r = -EIO;
                        goto unlock_and_return;
                } else if (1 != requests--) {
                        goto unlock_and_return;
                }
                header = MB1H_RELEASE_APE_OPP_100_VOLT;
        }

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(1))
                cpu_relax();

        writeb(header, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB1));

        writel(MBOX_BIT(1), PRCM_MBOX_CPU_SET);
        wait_for_completion(&mb1_transfer.work);

        if ((mb1_transfer.ack.header != header) ||
                ((mb1_transfer.ack.ape_voltage_status & BIT(0)) != 0))
                r = -EIO;

unlock_and_return:
        mutex_unlock(&mb1_transfer.lock);

        return r;
}

/**
 * prcmu_release_usb_wakeup_state - release the state required by a USB wakeup
 *
 * This function releases the power state requirements of a USB wakeup.
 */
int prcmu_release_usb_wakeup_state(void)
{
        int r = 0;

        mutex_lock(&mb1_transfer.lock);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(1))
                cpu_relax();

        writeb(MB1H_RELEASE_USB_WAKEUP,
                (tcdm_base + PRCM_MBOX_HEADER_REQ_MB1));

        writel(MBOX_BIT(1), PRCM_MBOX_CPU_SET);
        wait_for_completion(&mb1_transfer.work);

        if ((mb1_transfer.ack.header != MB1H_RELEASE_USB_WAKEUP) ||
                ((mb1_transfer.ack.ape_voltage_status & BIT(0)) != 0))
                r = -EIO;

        mutex_unlock(&mb1_transfer.lock);

        return r;
}

static int request_pll(u8 clock, bool enable)
{
        int r = 0;

        if (clock == PRCMU_PLLSOC0)
                clock = (enable ? PLL_SOC0_ON : PLL_SOC0_OFF);
        else if (clock == PRCMU_PLLSOC1)
                clock = (enable ? PLL_SOC1_ON : PLL_SOC1_OFF);
        else
                return -EINVAL;

        mutex_lock(&mb1_transfer.lock);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(1))
                cpu_relax();

        writeb(MB1H_PLL_ON_OFF, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB1));
        writeb(clock, (tcdm_base + PRCM_REQ_MB1_PLL_ON_OFF));

        writel(MBOX_BIT(1), PRCM_MBOX_CPU_SET);
        wait_for_completion(&mb1_transfer.work);

        if (mb1_transfer.ack.header != MB1H_PLL_ON_OFF)
                r = -EIO;

        mutex_unlock(&mb1_transfer.lock);

        return r;
}

/**
 * db8500_prcmu_set_epod - set the state of a EPOD (power domain)
 * @epod_id: The EPOD to set
 * @epod_state: The new EPOD state
 *
 * This function sets the state of a EPOD (power domain). It may not be called
 * from interrupt context.
 */
int db8500_prcmu_set_epod(u16 epod_id, u8 epod_state)
{
        int r = 0;
        bool ram_retention = false;
        int i;

        /* check argument */
        BUG_ON(epod_id >= NUM_EPOD_ID);

        /* set flag if retention is possible */
        switch (epod_id) {
        case EPOD_ID_SVAMMDSP:
        case EPOD_ID_SIAMMDSP:
        case EPOD_ID_ESRAM12:
        case EPOD_ID_ESRAM34:
                ram_retention = true;
                break;
        }

        /* check argument */
        BUG_ON(epod_state > EPOD_STATE_ON);
        BUG_ON(epod_state == EPOD_STATE_RAMRET && !ram_retention);

        /* get lock */
        mutex_lock(&mb2_transfer.lock);

        /* wait for mailbox */
        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(2))
                cpu_relax();

        /* fill in mailbox */
        for (i = 0; i < NUM_EPOD_ID; i++)
                writeb(EPOD_STATE_NO_CHANGE, (tcdm_base + PRCM_REQ_MB2 + i));
        writeb(epod_state, (tcdm_base + PRCM_REQ_MB2 + epod_id));

        writeb(MB2H_DPS, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB2));

        writel(MBOX_BIT(2), PRCM_MBOX_CPU_SET);

        /*
         * The current firmware version does not handle errors correctly,
         * and we cannot recover if there is an error.
         * This is expected to change when the firmware is updated.
         */
        if (!wait_for_completion_timeout(&mb2_transfer.work,
                        msecs_to_jiffies(20000))) {
                pr_err("prcmu: %s timed out (20 s) waiting for a reply.\n",
                        __func__);
                r = -EIO;
                goto unlock_and_return;
        }

        if (mb2_transfer.ack.status != HWACC_PWR_ST_OK)
                r = -EIO;

unlock_and_return:
        mutex_unlock(&mb2_transfer.lock);
        return r;
}

/**
 * prcmu_configure_auto_pm - Configure autonomous power management.
 * @sleep: Configuration for ApSleep.
 * @idle:  Configuration for ApIdle.
 */
void prcmu_configure_auto_pm(struct prcmu_auto_pm_config *sleep,
        struct prcmu_auto_pm_config *idle)
{
        u32 sleep_cfg;
        u32 idle_cfg;
        unsigned long flags;

        BUG_ON((sleep == NULL) || (idle == NULL));

        sleep_cfg = (sleep->sva_auto_pm_enable & 0xF);
        sleep_cfg = ((sleep_cfg << 4) | (sleep->sia_auto_pm_enable & 0xF));
        sleep_cfg = ((sleep_cfg << 8) | (sleep->sva_power_on & 0xFF));
        sleep_cfg = ((sleep_cfg << 8) | (sleep->sia_power_on & 0xFF));
        sleep_cfg = ((sleep_cfg << 4) | (sleep->sva_policy & 0xF));
        sleep_cfg = ((sleep_cfg << 4) | (sleep->sia_policy & 0xF));

        idle_cfg = (idle->sva_auto_pm_enable & 0xF);
        idle_cfg = ((idle_cfg << 4) | (idle->sia_auto_pm_enable & 0xF));
        idle_cfg = ((idle_cfg << 8) | (idle->sva_power_on & 0xFF));
        idle_cfg = ((idle_cfg << 8) | (idle->sia_power_on & 0xFF));
        idle_cfg = ((idle_cfg << 4) | (idle->sva_policy & 0xF));
        idle_cfg = ((idle_cfg << 4) | (idle->sia_policy & 0xF));

        spin_lock_irqsave(&mb2_transfer.auto_pm_lock, flags);

        /*
         * The autonomous power management configuration is done through
         * fields in mailbox 2, but these fields are only used as shared
         * variables - i.e. there is no need to send a message.
         */
        writel(sleep_cfg, (tcdm_base + PRCM_REQ_MB2_AUTO_PM_SLEEP));
        writel(idle_cfg, (tcdm_base + PRCM_REQ_MB2_AUTO_PM_IDLE));

        mb2_transfer.auto_pm_enabled =
                ((sleep->sva_auto_pm_enable == PRCMU_AUTO_PM_ON) ||
                 (sleep->sia_auto_pm_enable == PRCMU_AUTO_PM_ON) ||
                 (idle->sva_auto_pm_enable == PRCMU_AUTO_PM_ON) ||
                 (idle->sia_auto_pm_enable == PRCMU_AUTO_PM_ON));

        spin_unlock_irqrestore(&mb2_transfer.auto_pm_lock, flags);
}
EXPORT_SYMBOL(prcmu_configure_auto_pm);

bool prcmu_is_auto_pm_enabled(void)
{
        return mb2_transfer.auto_pm_enabled;
}

static int request_sysclk(bool enable)
{
        int r;
        unsigned long flags;

        r = 0;

        mutex_lock(&mb3_transfer.sysclk_lock);

        spin_lock_irqsave(&mb3_transfer.lock, flags);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(3))
                cpu_relax();

        writeb((enable ? ON : OFF), (tcdm_base + PRCM_REQ_MB3_SYSCLK_MGT));

        writeb(MB3H_SYSCLK, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB3));
        writel(MBOX_BIT(3), PRCM_MBOX_CPU_SET);

        spin_unlock_irqrestore(&mb3_transfer.lock, flags);

        /*
         * The firmware only sends an ACK if we want to enable the
         * SysClk, and it succeeds.
         */
        if (enable && !wait_for_completion_timeout(&mb3_transfer.sysclk_work,
                        msecs_to_jiffies(20000))) {
                pr_err("prcmu: %s timed out (20 s) waiting for a reply.\n",
                        __func__);
                r = -EIO;
        }

        mutex_unlock(&mb3_transfer.sysclk_lock);

        return r;
}

static int request_timclk(bool enable)
{
        u32 val = (PRCM_TCR_DOZE_MODE | PRCM_TCR_TENSEL_MASK);

        if (!enable)
                val |= PRCM_TCR_STOP_TIMERS;
        writel(val, PRCM_TCR);

        return 0;
}

static int request_clock(u8 clock, bool enable)
{
        u32 val;
        unsigned long flags;

        spin_lock_irqsave(&clk_mgt_lock, flags);

        /* Grab the HW semaphore. */
        while ((readl(PRCM_SEM) & PRCM_SEM_PRCM_SEM) != 0)
                cpu_relax();

        val = readl(clk_mgt[clock].reg);
        if (enable) {
                val |= (PRCM_CLK_MGT_CLKEN | clk_mgt[clock].pllsw);
        } else {
                clk_mgt[clock].pllsw = (val & PRCM_CLK_MGT_CLKPLLSW_MASK);
                val &= ~(PRCM_CLK_MGT_CLKEN | PRCM_CLK_MGT_CLKPLLSW_MASK);
        }
        writel(val, clk_mgt[clock].reg);

        /* Release the HW semaphore. */
        writel(0, PRCM_SEM);

        spin_unlock_irqrestore(&clk_mgt_lock, flags);

        return 0;
}

static int request_sga_clock(u8 clock, bool enable)
{
        u32 val;
        int ret;

        if (enable) {
                val = readl(PRCM_CGATING_BYPASS);
                writel(val | PRCM_CGATING_BYPASS_ICN2, PRCM_CGATING_BYPASS);
        }

        ret = request_clock(clock, enable);

        if (!ret && !enable) {
                val = readl(PRCM_CGATING_BYPASS);
                writel(val & ~PRCM_CGATING_BYPASS_ICN2, PRCM_CGATING_BYPASS);
        }

        return ret;
}

static inline bool plldsi_locked(void)
{
        return (readl(PRCM_PLLDSI_LOCKP) &
                (PRCM_PLLDSI_LOCKP_PRCM_PLLDSI_LOCKP10 |
                 PRCM_PLLDSI_LOCKP_PRCM_PLLDSI_LOCKP3)) ==
                (PRCM_PLLDSI_LOCKP_PRCM_PLLDSI_LOCKP10 |
                 PRCM_PLLDSI_LOCKP_PRCM_PLLDSI_LOCKP3);
}

static int request_plldsi(bool enable)
{
        int r = 0;
        u32 val;

        writel((PRCM_MMIP_LS_CLAMP_DSIPLL_CLAMP |
                PRCM_MMIP_LS_CLAMP_DSIPLL_CLAMPI), (enable ?
                PRCM_MMIP_LS_CLAMP_CLR : PRCM_MMIP_LS_CLAMP_SET));

        val = readl(PRCM_PLLDSI_ENABLE);
        if (enable)
                val |= PRCM_PLLDSI_ENABLE_PRCM_PLLDSI_ENABLE;
        else
                val &= ~PRCM_PLLDSI_ENABLE_PRCM_PLLDSI_ENABLE;
        writel(val, PRCM_PLLDSI_ENABLE);

        if (enable) {
                unsigned int i;
                bool locked = plldsi_locked();

                for (i = 10; !locked && (i > 0); --i) {
                        udelay(100);
                        locked = plldsi_locked();
                }
                if (locked) {
                        writel(PRCM_APE_RESETN_DSIPLL_RESETN,
                                PRCM_APE_RESETN_SET);
                } else {
                        writel((PRCM_MMIP_LS_CLAMP_DSIPLL_CLAMP |
                                PRCM_MMIP_LS_CLAMP_DSIPLL_CLAMPI),
                                PRCM_MMIP_LS_CLAMP_SET);
                        val &= ~PRCM_PLLDSI_ENABLE_PRCM_PLLDSI_ENABLE;
                        writel(val, PRCM_PLLDSI_ENABLE);
                        r = -EAGAIN;
                }
        } else {
                writel(PRCM_APE_RESETN_DSIPLL_RESETN, PRCM_APE_RESETN_CLR);
        }
        return r;
}

static int request_dsiclk(u8 n, bool enable)
{
        u32 val;

        val = readl(PRCM_DSI_PLLOUT_SEL);
        val &= ~dsiclk[n].divsel_mask;
        val |= ((enable ? dsiclk[n].divsel : PRCM_DSI_PLLOUT_SEL_OFF) <<
                dsiclk[n].divsel_shift);
        writel(val, PRCM_DSI_PLLOUT_SEL);
        return 0;
}

static int request_dsiescclk(u8 n, bool enable)
{
        u32 val;

        val = readl(PRCM_DSITVCLK_DIV);
        enable ? (val |= dsiescclk[n].en) : (val &= ~dsiescclk[n].en);
        writel(val, PRCM_DSITVCLK_DIV);
        return 0;
}

/**
 * db8500_prcmu_request_clock() - Request for a clock to be enabled or disabled.
 * @clock:      The clock for which the request is made.
 * @enable:     Whether the clock should be enabled (true) or disabled (false).
 *
 * This function should only be used by the clock implementation.
 * Do not use it from any other place!
 */
int db8500_prcmu_request_clock(u8 clock, bool enable)
{
        if (clock == PRCMU_SGACLK)
                return request_sga_clock(clock, enable);
        else if (clock < PRCMU_NUM_REG_CLOCKS)
                return request_clock(clock, enable);
        else if (clock == PRCMU_TIMCLK)
                return request_timclk(enable);
        else if ((clock == PRCMU_DSI0CLK) || (clock == PRCMU_DSI1CLK))
                return request_dsiclk((clock - PRCMU_DSI0CLK), enable);
        else if ((PRCMU_DSI0ESCCLK <= clock) && (clock <= PRCMU_DSI2ESCCLK))
                return request_dsiescclk((clock - PRCMU_DSI0ESCCLK), enable);
        else if (clock == PRCMU_PLLDSI)
                return request_plldsi(enable);
        else if (clock == PRCMU_SYSCLK)
                return request_sysclk(enable);
        else if ((clock == PRCMU_PLLSOC0) || (clock == PRCMU_PLLSOC1))
                return request_pll(clock, enable);
        else
                return -EINVAL;
}

static unsigned long pll_rate(void __iomem *reg, unsigned long src_rate,
        int branch)
{
        u64 rate;
        u32 val;
        u32 d;
        u32 div = 1;

        val = readl(reg);

        rate = src_rate;
        rate *= ((val & PRCM_PLL_FREQ_D_MASK) >> PRCM_PLL_FREQ_D_SHIFT);

        d = ((val & PRCM_PLL_FREQ_N_MASK) >> PRCM_PLL_FREQ_N_SHIFT);
        if (d > 1)
                div *= d;

        d = ((val & PRCM_PLL_FREQ_R_MASK) >> PRCM_PLL_FREQ_R_SHIFT);
        if (d > 1)
                div *= d;

        if (val & PRCM_PLL_FREQ_SELDIV2)
                div *= 2;

        if ((branch == PLL_FIX) || ((branch == PLL_DIV) &&
                (val & PRCM_PLL_FREQ_DIV2EN) &&
                ((reg == PRCM_PLLSOC0_FREQ) ||
                 (reg == PRCM_PLLARM_FREQ) ||
                 (reg == PRCM_PLLDDR_FREQ))))
                div *= 2;

        (void)do_div(rate, div);

        return (unsigned long)rate;
}

#define ROOT_CLOCK_RATE 38400000

static unsigned long clock_rate(u8 clock)
{
        u32 val;
        u32 pllsw;
        unsigned long rate = ROOT_CLOCK_RATE;

        val = readl(clk_mgt[clock].reg);

        if (val & PRCM_CLK_MGT_CLK38) {
                if (clk_mgt[clock].clk38div && (val & PRCM_CLK_MGT_CLK38DIV))
                        rate /= 2;
                return rate;
        }

        val |= clk_mgt[clock].pllsw;
        pllsw = (val & PRCM_CLK_MGT_CLKPLLSW_MASK);

        if (pllsw == PRCM_CLK_MGT_CLKPLLSW_SOC0)
                rate = pll_rate(PRCM_PLLSOC0_FREQ, rate, clk_mgt[clock].branch);
        else if (pllsw == PRCM_CLK_MGT_CLKPLLSW_SOC1)
                rate = pll_rate(PRCM_PLLSOC1_FREQ, rate, clk_mgt[clock].branch);
        else if (pllsw == PRCM_CLK_MGT_CLKPLLSW_DDR)
                rate = pll_rate(PRCM_PLLDDR_FREQ, rate, clk_mgt[clock].branch);
        else
                return 0;

        if ((clock == PRCMU_SGACLK) &&
                (val & PRCM_SGACLK_MGT_SGACLKDIV_BY_2_5_EN)) {
                u64 r = (rate * 10);

                (void)do_div(r, 25);
                return (unsigned long)r;
        }
        val &= PRCM_CLK_MGT_CLKPLLDIV_MASK;
        if (val)
                return rate / val;
        else
                return 0;
}
static unsigned long latest_armss_rate;
static unsigned long armss_rate(void)
{
        return latest_armss_rate;
}

static void compute_armss_rate(void)
{
        u32 r;
        unsigned long rate;

        r = readl(PRCM_ARM_CHGCLKREQ);

        if (r & PRCM_ARM_CHGCLKREQ_PRCM_ARM_CHGCLKREQ) {
                /* External ARMCLKFIX clock */

                rate = pll_rate(PRCM_PLLDDR_FREQ, ROOT_CLOCK_RATE, PLL_FIX);

                /* Check PRCM_ARM_CHGCLKREQ divider */
                if (!(r & PRCM_ARM_CHGCLKREQ_PRCM_ARM_DIVSEL))
                        rate /= 2;

                /* Check PRCM_ARMCLKFIX_MGT divider */
                r = readl(PRCM_ARMCLKFIX_MGT);
                r &= PRCM_CLK_MGT_CLKPLLDIV_MASK;
                rate /= r;

        } else {/* ARM PLL */
                rate = pll_rate(PRCM_PLLARM_FREQ, ROOT_CLOCK_RATE, PLL_DIV);
        }

        latest_armss_rate = rate;
}

static unsigned long dsiclk_rate(u8 n)
{
        u32 divsel;
        u32 div = 1;

        divsel = readl(PRCM_DSI_PLLOUT_SEL);
        divsel = ((divsel & dsiclk[n].divsel_mask) >> dsiclk[n].divsel_shift);

        if (divsel == PRCM_DSI_PLLOUT_SEL_OFF)
                divsel = dsiclk[n].divsel;

        switch (divsel) {
        case PRCM_DSI_PLLOUT_SEL_PHI_4:
                div *= 2;
        case PRCM_DSI_PLLOUT_SEL_PHI_2:
                div *= 2;
        case PRCM_DSI_PLLOUT_SEL_PHI:
                return pll_rate(PRCM_PLLDSI_FREQ, clock_rate(PRCMU_HDMICLK),
                        PLL_RAW) / div;
        default:
                return 0;
        }
}

static unsigned long dsiescclk_rate(u8 n)
{
        u32 div;

        div = readl(PRCM_DSITVCLK_DIV);
        div = ((div & dsiescclk[n].div_mask) >> (dsiescclk[n].div_shift));
        return clock_rate(PRCMU_TVCLK) / max((u32)1, div);
}

unsigned long prcmu_clock_rate(u8 clock)
{
        if (clock < PRCMU_NUM_REG_CLOCKS)
                return clock_rate(clock);
        else if (clock == PRCMU_TIMCLK)
                return ROOT_CLOCK_RATE / 16;
        else if (clock == PRCMU_SYSCLK)
                return ROOT_CLOCK_RATE;
        else if (clock == PRCMU_PLLSOC0)
                return pll_rate(PRCM_PLLSOC0_FREQ, ROOT_CLOCK_RATE, PLL_RAW);
        else if (clock == PRCMU_PLLSOC1)
                return pll_rate(PRCM_PLLSOC1_FREQ, ROOT_CLOCK_RATE, PLL_RAW);
        else if (clock == PRCMU_ARMSS)
                return armss_rate();
        else if (clock == PRCMU_PLLDDR)
                return pll_rate(PRCM_PLLDDR_FREQ, ROOT_CLOCK_RATE, PLL_RAW);
        else if (clock == PRCMU_PLLDSI)
                return pll_rate(PRCM_PLLDSI_FREQ, clock_rate(PRCMU_HDMICLK),
                        PLL_RAW);
        else if ((clock == PRCMU_DSI0CLK) || (clock == PRCMU_DSI1CLK))
                return dsiclk_rate(clock - PRCMU_DSI0CLK);
        else if ((PRCMU_DSI0ESCCLK <= clock) && (clock <= PRCMU_DSI2ESCCLK))
                return dsiescclk_rate(clock - PRCMU_DSI0ESCCLK);
        else
                return 0;
}

static unsigned long clock_source_rate(u32 clk_mgt_val, int branch)
{
        if (clk_mgt_val & PRCM_CLK_MGT_CLK38)
                return ROOT_CLOCK_RATE;
        clk_mgt_val &= PRCM_CLK_MGT_CLKPLLSW_MASK;
        if (clk_mgt_val == PRCM_CLK_MGT_CLKPLLSW_SOC0)
                return pll_rate(PRCM_PLLSOC0_FREQ, ROOT_CLOCK_RATE, branch);
        else if (clk_mgt_val == PRCM_CLK_MGT_CLKPLLSW_SOC1)
                return pll_rate(PRCM_PLLSOC1_FREQ, ROOT_CLOCK_RATE, branch);
        else if (clk_mgt_val == PRCM_CLK_MGT_CLKPLLSW_DDR)
                return pll_rate(PRCM_PLLDDR_FREQ, ROOT_CLOCK_RATE, branch);
        else
                return 0;
}

static u32 clock_divider(unsigned long src_rate, unsigned long rate)
{
        u32 div;

        div = (src_rate / rate);
        if (div == 0)
                return 1;
        if (rate < (src_rate / div))
                div++;
        return div;
}

static long round_clock_rate(u8 clock, unsigned long rate)
{
        u32 val;
        u32 div;
        unsigned long src_rate;
        long rounded_rate;

        val = readl(clk_mgt[clock].reg);
        src_rate = clock_source_rate((val | clk_mgt[clock].pllsw),
                clk_mgt[clock].branch);
        div = clock_divider(src_rate, rate);
        if (val & PRCM_CLK_MGT_CLK38) {
                if (clk_mgt[clock].clk38div) {
                        if (div > 2)
                                div = 2;
                } else {
                        div = 1;
                }
        } else if ((clock == PRCMU_SGACLK) && (div == 3)) {
                u64 r = (src_rate * 10);

                (void)do_div(r, 25);
                if (r <= rate)
                        return (unsigned long)r;
        }
        rounded_rate = (src_rate / min(div, (u32)31));

        return rounded_rate;
}

#define MIN_PLL_VCO_RATE 600000000ULL
#define MAX_PLL_VCO_RATE 1680640000ULL

static long round_plldsi_rate(unsigned long rate)
{
        long rounded_rate = 0;
        unsigned long src_rate;
        unsigned long rem;
        u32 r;

        src_rate = clock_rate(PRCMU_HDMICLK);
        rem = rate;

        for (r = 7; (rem > 0) && (r > 0); r--) {
                u64 d;

                d = (r * rate);
                (void)do_div(d, src_rate);
                if (d < 6)
                        d = 6;
                else if (d > 255)
                        d = 255;
                d *= src_rate;
                if (((2 * d) < (r * MIN_PLL_VCO_RATE)) ||
                        ((r * MAX_PLL_VCO_RATE) < (2 * d)))
                        continue;
                (void)do_div(d, r);
                if (rate < d) {
                        if (rounded_rate == 0)
                                rounded_rate = (long)d;
                        break;
                }
                if ((rate - d) < rem) {
                        rem = (rate - d);
                        rounded_rate = (long)d;
                }
        }
        return rounded_rate;
}

static long round_dsiclk_rate(unsigned long rate)
{
        u32 div;
        unsigned long src_rate;
        long rounded_rate;

        src_rate = pll_rate(PRCM_PLLDSI_FREQ, clock_rate(PRCMU_HDMICLK),
                PLL_RAW);
        div = clock_divider(src_rate, rate);
        rounded_rate = (src_rate / ((div > 2) ? 4 : div));

        return rounded_rate;
}

static long round_dsiescclk_rate(unsigned long rate)
{
        u32 div;
        unsigned long src_rate;
        long rounded_rate;

        src_rate = clock_rate(PRCMU_TVCLK);
        div = clock_divider(src_rate, rate);
        rounded_rate = (src_rate / min(div, (u32)255));

        return rounded_rate;
}

long prcmu_round_clock_rate(u8 clock, unsigned long rate)
{
        if (clock < PRCMU_NUM_REG_CLOCKS)
                return round_clock_rate(clock, rate);
        else if (clock == PRCMU_PLLDSI)
                return round_plldsi_rate(rate);
        else if ((clock == PRCMU_DSI0CLK) || (clock == PRCMU_DSI1CLK))
                return round_dsiclk_rate(rate);
        else if ((PRCMU_DSI0ESCCLK <= clock) && (clock <= PRCMU_DSI2ESCCLK))
                return round_dsiescclk_rate(rate);
        else
                return (long)prcmu_clock_rate(clock);
}

static void set_clock_rate(u8 clock, unsigned long rate)
{
        u32 val;
        u32 div;
        unsigned long src_rate;
        unsigned long flags;

        spin_lock_irqsave(&clk_mgt_lock, flags);

        /* Grab the HW semaphore. */
        while ((readl(PRCM_SEM) & PRCM_SEM_PRCM_SEM) != 0)
                cpu_relax();

        val = readl(clk_mgt[clock].reg);
        src_rate = clock_source_rate((val | clk_mgt[clock].pllsw),
                clk_mgt[clock].branch);
        div = clock_divider(src_rate, rate);
        if (val & PRCM_CLK_MGT_CLK38) {
                if (clk_mgt[clock].clk38div) {
                        if (div > 1)
                                val |= PRCM_CLK_MGT_CLK38DIV;
                        else
                                val &= ~PRCM_CLK_MGT_CLK38DIV;
                }
        } else if (clock == PRCMU_SGACLK) {
                val &= ~(PRCM_CLK_MGT_CLKPLLDIV_MASK |
                        PRCM_SGACLK_MGT_SGACLKDIV_BY_2_5_EN);
                if (div == 3) {
                        u64 r = (src_rate * 10);

                        (void)do_div(r, 25);
                        if (r <= rate) {
                                val |= PRCM_SGACLK_MGT_SGACLKDIV_BY_2_5_EN;
                                div = 0;
                        }
                }
                val |= min(div, (u32)31);
        } else {
                val &= ~PRCM_CLK_MGT_CLKPLLDIV_MASK;
                val |= min(div, (u32)31);
        }
        writel(val, clk_mgt[clock].reg);

        /* Release the HW semaphore. */
        writel(0, PRCM_SEM);

        spin_unlock_irqrestore(&clk_mgt_lock, flags);
}

static int set_plldsi_rate(unsigned long rate)
{
        unsigned long src_rate;
        unsigned long rem;
        u32 pll_freq = 0;
        u32 r;

        src_rate = clock_rate(PRCMU_HDMICLK);
        rem = rate;

        for (r = 7; (rem > 0) && (r > 0); r--) {
                u64 d;
                u64 hwrate;

                d = (r * rate);
                (void)do_div(d, src_rate);
                if (d < 6)
                        d = 6;
                else if (d > 255)
                        d = 255;
                hwrate = (d * src_rate);
                if (((2 * hwrate) < (r * MIN_PLL_VCO_RATE)) ||
                        ((r * MAX_PLL_VCO_RATE) < (2 * hwrate)))
                        continue;
                (void)do_div(hwrate, r);
                if (rate < hwrate) {
                        if (pll_freq == 0)
                                pll_freq = (((u32)d << PRCM_PLL_FREQ_D_SHIFT) |
                                        (r << PRCM_PLL_FREQ_R_SHIFT));
                        break;
                }
                if ((rate - hwrate) < rem) {
                        rem = (rate - hwrate);
                        pll_freq = (((u32)d << PRCM_PLL_FREQ_D_SHIFT) |
                                (r << PRCM_PLL_FREQ_R_SHIFT));
                }
        }
        if (pll_freq == 0)
                return -EINVAL;

        pll_freq |= (1 << PRCM_PLL_FREQ_N_SHIFT);
        writel(pll_freq, PRCM_PLLDSI_FREQ);

        return 0;
}

static void set_dsiclk_rate(u8 n, unsigned long rate)
{

        u32 val;
        u32 div;

        div = clock_divider(pll_rate(PRCM_PLLDSI_FREQ,
                        clock_rate(PRCMU_HDMICLK), PLL_RAW), rate);

        dsiclk[n].divsel = (div == 1) ? PRCM_DSI_PLLOUT_SEL_PHI :
                           (div == 2) ? PRCM_DSI_PLLOUT_SEL_PHI_2 :
                           /* else */   PRCM_DSI_PLLOUT_SEL_PHI_4;

        val = readl(PRCM_DSI_PLLOUT_SEL);
        val &= ~dsiclk[n].divsel_mask;
        val |= (dsiclk[n].divsel << dsiclk[n].divsel_shift);
        writel(val, PRCM_DSI_PLLOUT_SEL);
}

static void set_dsiescclk_rate(u8 n, unsigned long rate)
{
        u32 val;
        u32 div;

        div = clock_divider(clock_rate(PRCMU_TVCLK), rate);
        val = readl(PRCM_DSITVCLK_DIV);
        val &= ~dsiescclk[n].div_mask;
        val |= (min(div, (u32)255) << dsiescclk[n].div_shift);
        writel(val, PRCM_DSITVCLK_DIV);
}

int prcmu_set_clock_rate(u8 clock, unsigned long rate)
{
        if (clock < PRCMU_NUM_REG_CLOCKS)
                set_clock_rate(clock, rate);
        else if (clock == PRCMU_PLLDSI)
                return set_plldsi_rate(rate);
        else if ((clock == PRCMU_DSI0CLK) || (clock == PRCMU_DSI1CLK))
                set_dsiclk_rate((clock - PRCMU_DSI0CLK), rate);
        else if ((PRCMU_DSI0ESCCLK <= clock) && (clock <= PRCMU_DSI2ESCCLK))
                set_dsiescclk_rate((clock - PRCMU_DSI0ESCCLK), rate);
        return 0;
}

int db8500_prcmu_config_esram0_deep_sleep(u8 state)
{
        if ((state > ESRAM0_DEEP_SLEEP_STATE_RET) ||
            (state < ESRAM0_DEEP_SLEEP_STATE_OFF))
                return -EINVAL;

        mutex_lock(&mb4_transfer.lock);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(4))
                cpu_relax();

        writeb(MB4H_MEM_ST, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB4));
        writeb(((DDR_PWR_STATE_OFFHIGHLAT << 4) | DDR_PWR_STATE_ON),
               (tcdm_base + PRCM_REQ_MB4_DDR_ST_AP_SLEEP_IDLE));
        writeb(DDR_PWR_STATE_ON,
               (tcdm_base + PRCM_REQ_MB4_DDR_ST_AP_DEEP_IDLE));
        writeb(state, (tcdm_base + PRCM_REQ_MB4_ESRAM0_ST));

        writel(MBOX_BIT(4), PRCM_MBOX_CPU_SET);
        wait_for_completion(&mb4_transfer.work);

        mutex_unlock(&mb4_transfer.lock);

        return 0;
}

int db8500_prcmu_config_hotdog(u8 threshold)
{
        mutex_lock(&mb4_transfer.lock);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(4))
                cpu_relax();

        writeb(threshold, (tcdm_base + PRCM_REQ_MB4_HOTDOG_THRESHOLD));
        writeb(MB4H_HOTDOG, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB4));

        writel(MBOX_BIT(4), PRCM_MBOX_CPU_SET);
        wait_for_completion(&mb4_transfer.work);

        mutex_unlock(&mb4_transfer.lock);

        return 0;
}

int db8500_prcmu_config_hotmon(u8 low, u8 high)
{
        mutex_lock(&mb4_transfer.lock);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(4))
                cpu_relax();

        writeb(low, (tcdm_base + PRCM_REQ_MB4_HOTMON_LOW));
        writeb(high, (tcdm_base + PRCM_REQ_MB4_HOTMON_HIGH));
        writeb((HOTMON_CONFIG_LOW | HOTMON_CONFIG_HIGH),
                (tcdm_base + PRCM_REQ_MB4_HOTMON_CONFIG));
        writeb(MB4H_HOTMON, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB4));

        writel(MBOX_BIT(4), PRCM_MBOX_CPU_SET);
        wait_for_completion(&mb4_transfer.work);

        mutex_unlock(&mb4_transfer.lock);

        return 0;
}

static int config_hot_period(u16 val)
{
        mutex_lock(&mb4_transfer.lock);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(4))
                cpu_relax();

        writew(val, (tcdm_base + PRCM_REQ_MB4_HOT_PERIOD));
        writeb(MB4H_HOT_PERIOD, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB4));

        writel(MBOX_BIT(4), PRCM_MBOX_CPU_SET);
        wait_for_completion(&mb4_transfer.work);

        mutex_unlock(&mb4_transfer.lock);

        return 0;
}

int db8500_prcmu_start_temp_sense(u16 cycles32k)
{
        if (cycles32k == 0xFFFF)
                return -EINVAL;

        return config_hot_period(cycles32k);
}

int db8500_prcmu_stop_temp_sense(void)
{
        return config_hot_period(0xFFFF);
}

static int prcmu_a9wdog(u8 cmd, u8 d0, u8 d1, u8 d2, u8 d3)
{

        mutex_lock(&mb4_transfer.lock);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(4))
                cpu_relax();

        writeb(d0, (tcdm_base + PRCM_REQ_MB4_A9WDOG_0));
        writeb(d1, (tcdm_base + PRCM_REQ_MB4_A9WDOG_1));
        writeb(d2, (tcdm_base + PRCM_REQ_MB4_A9WDOG_2));
        writeb(d3, (tcdm_base + PRCM_REQ_MB4_A9WDOG_3));

        writeb(cmd, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB4));

        writel(MBOX_BIT(4), PRCM_MBOX_CPU_SET);
        wait_for_completion(&mb4_transfer.work);

        mutex_unlock(&mb4_transfer.lock);

        return 0;

}

int db8500_prcmu_config_a9wdog(u8 num, bool sleep_auto_off)
{
        BUG_ON(num == 0 || num > 0xf);
        return prcmu_a9wdog(MB4H_A9WDOG_CONF, num, 0, 0,
                            sleep_auto_off ? A9WDOG_AUTO_OFF_EN :
                            A9WDOG_AUTO_OFF_DIS);
}

int db8500_prcmu_enable_a9wdog(u8 id)
{
        return prcmu_a9wdog(MB4H_A9WDOG_EN, id, 0, 0, 0);
}

int db8500_prcmu_disable_a9wdog(u8 id)
{
        return prcmu_a9wdog(MB4H_A9WDOG_DIS, id, 0, 0, 0);
}

int db8500_prcmu_kick_a9wdog(u8 id)
{
        return prcmu_a9wdog(MB4H_A9WDOG_KICK, id, 0, 0, 0);
}

/*
 * timeout is 28 bit, in ms.
 */
int db8500_prcmu_load_a9wdog(u8 id, u32 timeout)
{
        return prcmu_a9wdog(MB4H_A9WDOG_LOAD,
                            (id & A9WDOG_ID_MASK) |
                            /*
                             * Put the lowest 28 bits of timeout at
                             * offset 4. Four first bits are used for id.
                             */
                            (u8)((timeout << 4) & 0xf0),
                            (u8)((timeout >> 4) & 0xff),
                            (u8)((timeout >> 12) & 0xff),
                            (u8)((timeout >> 20) & 0xff));
}

/**
 * prcmu_abb_read() - Read register value(s) from the ABB.
 * @slave:      The I2C slave address.
 * @reg:        The (start) register address.
 * @value:      The read out value(s).
 * @size:       The number of registers to read.
 *
 * Reads register value(s) from the ABB.
 * @size has to be 1 for the current firmware version.
 */
int prcmu_abb_read(u8 slave, u8 reg, u8 *value, u8 size)
{
        int r;

        if (size != 1)
                return -EINVAL;

        mutex_lock(&mb5_transfer.lock);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(5))
                cpu_relax();

        writeb(0, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB5));
        writeb(PRCMU_I2C_READ(slave), (tcdm_base + PRCM_REQ_MB5_I2C_SLAVE_OP));
        writeb(PRCMU_I2C_STOP_EN, (tcdm_base + PRCM_REQ_MB5_I2C_HW_BITS));
        writeb(reg, (tcdm_base + PRCM_REQ_MB5_I2C_REG));
        writeb(0, (tcdm_base + PRCM_REQ_MB5_I2C_VAL));

        writel(MBOX_BIT(5), PRCM_MBOX_CPU_SET);

        if (!wait_for_completion_timeout(&mb5_transfer.work,
                                msecs_to_jiffies(20000))) {
                pr_err("prcmu: %s timed out (20 s) waiting for a reply.\n",
                        __func__);
                r = -EIO;
        } else {
                r = ((mb5_transfer.ack.status == I2C_RD_OK) ? 0 : -EIO);
        }

        if (!r)
                *value = mb5_transfer.ack.value;

        mutex_unlock(&mb5_transfer.lock);

        return r;
}

/**
 * prcmu_abb_write_masked() - Write masked register value(s) to the ABB.
 * @slave:      The I2C slave address.
 * @reg:        The (start) register address.
 * @value:      The value(s) to write.
 * @mask:       The mask(s) to use.
 * @size:       The number of registers to write.
 *
 * Writes masked register value(s) to the ABB.
 * For each @value, only the bits set to 1 in the corresponding @mask
 * will be written. The other bits are not changed.
 * @size has to be 1 for the current firmware version.
 */
int prcmu_abb_write_masked(u8 slave, u8 reg, u8 *value, u8 *mask, u8 size)
{
        int r;

        if (size != 1)
                return -EINVAL;

        mutex_lock(&mb5_transfer.lock);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(5))
                cpu_relax();

        writeb(~*mask, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB5));
        writeb(PRCMU_I2C_WRITE(slave), (tcdm_base + PRCM_REQ_MB5_I2C_SLAVE_OP));
        writeb(PRCMU_I2C_STOP_EN, (tcdm_base + PRCM_REQ_MB5_I2C_HW_BITS));
        writeb(reg, (tcdm_base + PRCM_REQ_MB5_I2C_REG));
        writeb(*value, (tcdm_base + PRCM_REQ_MB5_I2C_VAL));

        writel(MBOX_BIT(5), PRCM_MBOX_CPU_SET);

        if (!wait_for_completion_timeout(&mb5_transfer.work,
                                msecs_to_jiffies(20000))) {
                pr_err("prcmu: %s timed out (20 s) waiting for a reply.\n",
                        __func__);
                r = -EIO;
        } else {
                r = ((mb5_transfer.ack.status == I2C_WR_OK) ? 0 : -EIO);
        }

        mutex_unlock(&mb5_transfer.lock);

        return r;
}

/**
 * prcmu_abb_write() - Write register value(s) to the ABB.
 * @slave:      The I2C slave address.
 * @reg:        The (start) register address.
 * @value:      The value(s) to write.
 * @size:       The number of registers to write.
 *
 * Writes register value(s) to the ABB.
 * @size has to be 1 for the current firmware version.
 */
int prcmu_abb_write(u8 slave, u8 reg, u8 *value, u8 size)
{
        u8 mask = ~0;

        return prcmu_abb_write_masked(slave, reg, value, &mask, size);
}

/**
 * prcmu_ac_wake_req - should be called whenever ARM wants to wakeup Modem
 */
int prcmu_ac_wake_req(void)
{
        u32 val;
        int ret = 0;

        mutex_lock(&mb0_transfer.ac_wake_lock);

        val = readl(PRCM_HOSTACCESS_REQ);
        if (val & PRCM_HOSTACCESS_REQ_HOSTACCESS_REQ)
                goto unlock_and_return;

        atomic_set(&ac_wake_req_state, 1);

        /*
         * Force Modem Wake-up before hostaccess_req ping-pong.
         * It prevents Modem to enter in Sleep while acking the hostaccess
         * request. The 31us delay has been calculated by HWI.
         */
        val |= PRCM_HOSTACCESS_REQ_WAKE_REQ;
        writel(val, PRCM_HOSTACCESS_REQ);

        udelay(31);

        val |= PRCM_HOSTACCESS_REQ_HOSTACCESS_REQ;
        writel(val, PRCM_HOSTACCESS_REQ);

        if (!wait_for_completion_timeout(&mb0_transfer.ac_wake_work,
                        msecs_to_jiffies(5000))) {
#if defined(CONFIG_DBX500_PRCMU_DEBUG)
                db8500_prcmu_debug_dump(__func__, true, true);
#endif
                pr_crit("prcmu: %s timed out (5 s) waiting for a reply.\n",
                        __func__);
                ret = -EFAULT;
        }

unlock_and_return:
        mutex_unlock(&mb0_transfer.ac_wake_lock);
        return ret;
}

/**
 * prcmu_ac_sleep_req - called when ARM no longer needs to talk to modem
 */
void prcmu_ac_sleep_req()
{
        u32 val;

        mutex_lock(&mb0_transfer.ac_wake_lock);

        val = readl(PRCM_HOSTACCESS_REQ);
        if (!(val & PRCM_HOSTACCESS_REQ_HOSTACCESS_REQ))
                goto unlock_and_return;

        writel((val & ~PRCM_HOSTACCESS_REQ_HOSTACCESS_REQ),
                PRCM_HOSTACCESS_REQ);

        if (!wait_for_completion_timeout(&mb0_transfer.ac_wake_work,
                        msecs_to_jiffies(5000))) {
                pr_crit("prcmu: %s timed out (5 s) waiting for a reply.\n",
                        __func__);
        }

        atomic_set(&ac_wake_req_state, 0);

unlock_and_return:
        mutex_unlock(&mb0_transfer.ac_wake_lock);
}

bool db8500_prcmu_is_ac_wake_requested(void)
{
        return (atomic_read(&ac_wake_req_state) != 0);
}

/**
 * db8500_prcmu_system_reset - System reset
 *
 * Saves the reset reason code and then sets the APE_SOFTRST register which
 * fires interrupt to fw
 */
void db8500_prcmu_system_reset(u16 reset_code)
{
        writew(reset_code, (tcdm_base + PRCM_SW_RST_REASON));
        writel(1, PRCM_APE_SOFTRST);
}

/**
 * db8500_prcmu_get_reset_code - Retrieve SW reset reason code
 *
 * Retrieves the reset reason code stored by prcmu_system_reset() before
 * last restart.
 */
u16 db8500_prcmu_get_reset_code(void)
{
        return readw(tcdm_base + PRCM_SW_RST_REASON);
}

/**
 * db8500_prcmu_reset_modem - ask the PRCMU to reset modem
 */
void db8500_prcmu_modem_reset(void)
{
        mutex_lock(&mb1_transfer.lock);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(1))
                cpu_relax();

        writeb(MB1H_RESET_MODEM, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB1));
        writel(MBOX_BIT(1), PRCM_MBOX_CPU_SET);
        wait_for_completion(&mb1_transfer.work);

        /*
         * No need to check return from PRCMU as modem should go in reset state
         * This state is already managed by upper layer
         */

        mutex_unlock(&mb1_transfer.lock);
}

static void ack_dbb_wakeup(void)
{
        unsigned long flags;

        spin_lock_irqsave(&mb0_transfer.lock, flags);

        while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(0))
                cpu_relax();

        writeb(MB0H_READ_WAKEUP_ACK, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB0));
        writel(MBOX_BIT(0), PRCM_MBOX_CPU_SET);

        spin_unlock_irqrestore(&mb0_transfer.lock, flags);
}

static inline void print_unknown_header_warning(u8 n, u8 header)
{
        pr_warning("prcmu: Unknown message header (%d) in mailbox %d.\n",
                header, n);
}

static bool read_mailbox_0(void)
{
        bool r;
        u32 ev;
        unsigned int n;
        u8 header;

        header = readb(tcdm_base + PRCM_MBOX_HEADER_ACK_MB0);
        switch (header) {
        case MB0H_WAKEUP_EXE:
        case MB0H_WAKEUP_SLEEP:
                if (readb(tcdm_base + PRCM_ACK_MB0_READ_POINTER) & 1)
                        ev = readl(tcdm_base + PRCM_ACK_MB0_WAKEUP_1_8500);
                else
                        ev = readl(tcdm_base + PRCM_ACK_MB0_WAKEUP_0_8500);

                if (ev & (WAKEUP_BIT_AC_WAKE_ACK | WAKEUP_BIT_AC_SLEEP_ACK))
                        complete(&mb0_transfer.ac_wake_work);
                if (ev & WAKEUP_BIT_SYSCLK_OK)
                        complete(&mb3_transfer.sysclk_work);

                ev &= mb0_transfer.req.dbb_irqs;

                for (n = 0; n < NUM_PRCMU_WAKEUPS; n++) {
                        if (ev & prcmu_irq_bit[n])
                                generic_handle_irq(IRQ_PRCMU_BASE + n);
                }
                r = true;
                break;
        default:
                print_unknown_header_warning(0, header);
                r = false;
                break;
        }
        writel(MBOX_BIT(0), PRCM_ARM_IT1_CLR);
        return r;
}

static bool read_mailbox_1(void)
{
        mb1_transfer.ack.header = readb(tcdm_base + PRCM_MBOX_HEADER_REQ_MB1);
        mb1_transfer.ack.arm_opp = readb(tcdm_base +
                PRCM_ACK_MB1_CURRENT_ARM_OPP);
        mb1_transfer.ack.ape_opp = readb(tcdm_base +
                PRCM_ACK_MB1_CURRENT_APE_OPP);
        mb1_transfer.ack.ape_voltage_status = readb(tcdm_base +
                PRCM_ACK_MB1_APE_VOLTAGE_STATUS);
        writel(MBOX_BIT(1), PRCM_ARM_IT1_CLR);
        complete(&mb1_transfer.work);
        return false;
}

static bool read_mailbox_2(void)
{
        mb2_transfer.ack.status = readb(tcdm_base + PRCM_ACK_MB2_DPS_STATUS);
        writel(MBOX_BIT(2), PRCM_ARM_IT1_CLR);
        complete(&mb2_transfer.work);
        return false;
}

static bool read_mailbox_3(void)
{
        writel(MBOX_BIT(3), PRCM_ARM_IT1_CLR);
        return false;
}

static bool read_mailbox_4(void)
{
        u8 header;
        bool do_complete = true;

        header = readb(tcdm_base + PRCM_MBOX_HEADER_REQ_MB4);
        switch (header) {
        case MB4H_MEM_ST:
        case MB4H_HOTDOG:
        case MB4H_HOTMON:
        case MB4H_HOT_PERIOD:
        case MB4H_A9WDOG_CONF:
        case MB4H_A9WDOG_EN:
        case MB4H_A9WDOG_DIS:
        case MB4H_A9WDOG_LOAD:
        case MB4H_A9WDOG_KICK:
                break;
        default:
                print_unknown_header_warning(4, header);
                do_complete = false;
                break;
        }

        writel(MBOX_BIT(4), PRCM_ARM_IT1_CLR);

        if (do_complete)
                complete(&mb4_transfer.work);

        return false;
}

static bool read_mailbox_5(void)
{
        mb5_transfer.ack.status = readb(tcdm_base + PRCM_ACK_MB5_I2C_STATUS);
        mb5_transfer.ack.value = readb(tcdm_base + PRCM_ACK_MB5_I2C_VAL);
        writel(MBOX_BIT(5), PRCM_ARM_IT1_CLR);
        complete(&mb5_transfer.work);
        return false;
}

static bool read_mailbox_6(void)
{
        writel(MBOX_BIT(6), PRCM_ARM_IT1_CLR);
        return false;
}

static bool read_mailbox_7(void)
{
        writel(MBOX_BIT(7), PRCM_ARM_IT1_CLR);
        return false;
}

static bool (* const read_mailbox[NUM_MB])(void) = {
        read_mailbox_0,
        read_mailbox_1,
        read_mailbox_2,
        read_mailbox_3,
        read_mailbox_4,
        read_mailbox_5,
        read_mailbox_6,
        read_mailbox_7
};

static irqreturn_t prcmu_irq_handler(int irq, void *data)
{
        u32 bits;
        u8 n;
        irqreturn_t r;

        bits = (readl(PRCM_ARM_IT1_VAL) & ALL_MBOX_BITS);
        if (unlikely(!bits))
                return IRQ_NONE;

        r = IRQ_HANDLED;
        for (n = 0; bits; n++) {
                if (bits & MBOX_BIT(n)) {
                        bits -= MBOX_BIT(n);
                        if (read_mailbox[n]())
                                r = IRQ_WAKE_THREAD;
                }
        }
        return r;
}

static irqreturn_t prcmu_irq_thread_fn(int irq, void *data)
{
        ack_dbb_wakeup();
        return IRQ_HANDLED;
}

static void prcmu_mask_work(struct work_struct *work)
{
        unsigned long flags;

        spin_lock_irqsave(&mb0_transfer.lock, flags);

        config_wakeups();

        spin_unlock_irqrestore(&mb0_transfer.lock, flags);
}

static void prcmu_irq_mask(struct irq_data *d)
{
        unsigned long flags;

        spin_lock_irqsave(&mb0_transfer.dbb_irqs_lock, flags);

        mb0_transfer.req.dbb_irqs &= ~prcmu_irq_bit[d->hwirq];

        spin_unlock_irqrestore(&mb0_transfer.dbb_irqs_lock, flags);

        if (d->irq != IRQ_PRCMU_CA_SLEEP)
                schedule_work(&mb0_transfer.mask_work);
}

static void prcmu_irq_unmask(struct irq_data *d)
{
        unsigned long flags;

        spin_lock_irqsave(&mb0_transfer.dbb_irqs_lock, flags);

        mb0_transfer.req.dbb_irqs |= prcmu_irq_bit[d->hwirq];

        spin_unlock_irqrestore(&mb0_transfer.dbb_irqs_lock, flags);

        if (d->irq != IRQ_PRCMU_CA_SLEEP)
                schedule_work(&mb0_transfer.mask_work);
}

static void noop(struct irq_data *d)
{
}

static struct irq_chip prcmu_irq_chip = {
        .name           = "prcmu",
        .irq_disable    = prcmu_irq_mask,
        .irq_ack        = noop,
        .irq_mask       = prcmu_irq_mask,
        .irq_unmask     = prcmu_irq_unmask,
};

static char *fw_project_name(u8 project)
{
        switch (project) {
        case PRCMU_FW_PROJECT_U8500:
                return "U8500";
        case PRCMU_FW_PROJECT_U8500_C2:
                return "U8500 C2";
        case PRCMU_FW_PROJECT_U9500:
                return "U9500";
        case PRCMU_FW_PROJECT_U9500_C2:
                return "U9500 C2";
        case PRCMU_FW_PROJECT_U8520:
                return "U8520";
        case PRCMU_FW_PROJECT_U8420:
                return "U8420";
        default:
                return "Unknown";
        }
}

static int db8500_irq_map(struct irq_domain *d, unsigned int virq,
                                irq_hw_number_t hwirq)
{
        irq_set_chip_and_handler(virq, &prcmu_irq_chip,
                                handle_simple_irq);
        set_irq_flags(virq, IRQF_VALID);

        return 0;
}

static struct irq_domain_ops db8500_irq_ops = {
        .map    = db8500_irq_map,
        .xlate  = irq_domain_xlate_twocell,
};

static int db8500_irq_init(struct device_node *np)
{
        db8500_irq_domain = irq_domain_add_legacy(
                np, NUM_PRCMU_WAKEUPS, IRQ_PRCMU_BASE,
                0, &db8500_irq_ops, NULL);

        if (!db8500_irq_domain) {
                pr_err("Failed to create irqdomain\n");
                return -ENOSYS;
        }

        return 0;
}

void __init db8500_prcmu_early_init(void)
{
        if (cpu_is_u8500v2()) {
                void *tcpm_base = ioremap_nocache(U8500_PRCMU_TCPM_BASE, SZ_4K);

                if (tcpm_base != NULL) {
                        u32 version;
                        version = readl(tcpm_base + PRCMU_FW_VERSION_OFFSET);
                        fw_info.version.project = version & 0xFF;
                        fw_info.version.api_version = (version >> 8) & 0xFF;
                        fw_info.version.func_version = (version >> 16) & 0xFF;
                        fw_info.version.errata = (version >> 24) & 0xFF;
                        fw_info.valid = true;
                        pr_info("PRCMU firmware: %s, version %d.%d.%d\n",
                                fw_project_name(fw_info.version.project),
                                (version >> 8) & 0xFF, (version >> 16) & 0xFF,
                                (version >> 24) & 0xFF);
                        iounmap(tcpm_base);
                }

                tcdm_base = __io_address(U8500_PRCMU_TCDM_BASE);
        } else {
                pr_err("prcmu: Unsupported chip version\n");
                BUG();
        }

        spin_lock_init(&mb0_transfer.lock);
        spin_lock_init(&mb0_transfer.dbb_irqs_lock);
        mutex_init(&mb0_transfer.ac_wake_lock);
        init_completion(&mb0_transfer.ac_wake_work);
        mutex_init(&mb1_transfer.lock);
        init_completion(&mb1_transfer.work);
        mb1_transfer.ape_opp = APE_NO_CHANGE;
        mutex_init(&mb2_transfer.lock);
        init_completion(&mb2_transfer.work);
        spin_lock_init(&mb2_transfer.auto_pm_lock);
        spin_lock_init(&mb3_transfer.lock);
        mutex_init(&mb3_transfer.sysclk_lock);
        init_completion(&mb3_transfer.sysclk_work);
        mutex_init(&mb4_transfer.lock);
        init_completion(&mb4_transfer.work);
        mutex_init(&mb5_transfer.lock);
        init_completion(&mb5_transfer.work);

        INIT_WORK(&mb0_transfer.mask_work, prcmu_mask_work);

        compute_armss_rate();
}

static void __init init_prcm_registers(void)
{
        u32 val;

        val = readl(PRCM_A9PL_FORCE_CLKEN);
        val &= ~(PRCM_A9PL_FORCE_CLKEN_PRCM_A9PL_FORCE_CLKEN |
                PRCM_A9PL_FORCE_CLKEN_PRCM_A9AXI_FORCE_CLKEN);
        writel(val, (PRCM_A9PL_FORCE_CLKEN));
}

/*
 * Power domain switches (ePODs) modeled as regulators for the DB8500 SoC
 */
static struct regulator_consumer_supply db8500_vape_consumers[] = {
        REGULATOR_SUPPLY("v-ape", NULL),
        REGULATOR_SUPPLY("v-i2c", "nmk-i2c.0"),
        REGULATOR_SUPPLY("v-i2c", "nmk-i2c.1"),
        REGULATOR_SUPPLY("v-i2c", "nmk-i2c.2"),
        REGULATOR_SUPPLY("v-i2c", "nmk-i2c.3"),
        REGULATOR_SUPPLY("v-i2c", "nmk-i2c.4"),
        /* "v-mmc" changed to "vcore" in the mainline kernel */
        REGULATOR_SUPPLY("vcore", "sdi0"),
        REGULATOR_SUPPLY("vcore", "sdi1"),
        REGULATOR_SUPPLY("vcore", "sdi2"),
        REGULATOR_SUPPLY("vcore", "sdi3"),
        REGULATOR_SUPPLY("vcore", "sdi4"),
        REGULATOR_SUPPLY("v-dma", "dma40.0"),
        REGULATOR_SUPPLY("v-ape", "ab8500-usb.0"),
        /* "v-uart" changed to "vcore" in the mainline kernel */
        REGULATOR_SUPPLY("vcore", "uart0"),
        REGULATOR_SUPPLY("vcore", "uart1"),
        REGULATOR_SUPPLY("vcore", "uart2"),
        REGULATOR_SUPPLY("v-ape", "nmk-ske-keypad.0"),
        REGULATOR_SUPPLY("v-hsi", "ste_hsi.0"),
        REGULATOR_SUPPLY("vddvario", "smsc911x.0"),
};

static struct regulator_consumer_supply db8500_vsmps2_consumers[] = {
        REGULATOR_SUPPLY("musb_1v8", "ab8500-usb.0"),
        /* AV8100 regulator */
        REGULATOR_SUPPLY("hdmi_1v8", "0-0070"),
};

static struct regulator_consumer_supply db8500_b2r2_mcde_consumers[] = {
        REGULATOR_SUPPLY("vsupply", "b2r2_bus"),
        REGULATOR_SUPPLY("vsupply", "mcde"),
};

/* SVA MMDSP regulator switch */
static struct regulator_consumer_supply db8500_svammdsp_consumers[] = {
        REGULATOR_SUPPLY("sva-mmdsp", "cm_control"),
};

/* SVA pipe regulator switch */
static struct regulator_consumer_supply db8500_svapipe_consumers[] = {
        REGULATOR_SUPPLY("sva-pipe", "cm_control"),
};

/* SIA MMDSP regulator switch */
static struct regulator_consumer_supply db8500_siammdsp_consumers[] = {
        REGULATOR_SUPPLY("sia-mmdsp", "cm_control"),
};

/* SIA pipe regulator switch */
static struct regulator_consumer_supply db8500_siapipe_consumers[] = {
        REGULATOR_SUPPLY("sia-pipe", "cm_control"),
};

static struct regulator_consumer_supply db8500_sga_consumers[] = {
        REGULATOR_SUPPLY("v-mali", NULL),
};

/* ESRAM1 and 2 regulator switch */
static struct regulator_consumer_supply db8500_esram12_consumers[] = {
        REGULATOR_SUPPLY("esram12", "cm_control"),
};

/* ESRAM3 and 4 regulator switch */
static struct regulator_consumer_supply db8500_esram34_consumers[] = {
        REGULATOR_SUPPLY("v-esram34", "mcde"),
        REGULATOR_SUPPLY("esram34", "cm_control"),
        REGULATOR_SUPPLY("lcla_esram", "dma40.0"),
};

static struct regulator_init_data db8500_regulators[DB8500_NUM_REGULATORS] = {
        [DB8500_REGULATOR_VAPE] = {
                .constraints = {
                        .name = "db8500-vape",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                        .always_on = true,
                },
                .consumer_supplies = db8500_vape_consumers,
                .num_consumer_supplies = ARRAY_SIZE(db8500_vape_consumers),
        },
        [DB8500_REGULATOR_VARM] = {
                .constraints = {
                        .name = "db8500-varm",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
        },
        [DB8500_REGULATOR_VMODEM] = {
                .constraints = {
                        .name = "db8500-vmodem",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
        },
        [DB8500_REGULATOR_VPLL] = {
                .constraints = {
                        .name = "db8500-vpll",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
        },
        [DB8500_REGULATOR_VSMPS1] = {
                .constraints = {
                        .name = "db8500-vsmps1",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
        },
        [DB8500_REGULATOR_VSMPS2] = {
                .constraints = {
                        .name = "db8500-vsmps2",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
                .consumer_supplies = db8500_vsmps2_consumers,
                .num_consumer_supplies = ARRAY_SIZE(db8500_vsmps2_consumers),
        },
        [DB8500_REGULATOR_VSMPS3] = {
                .constraints = {
                        .name = "db8500-vsmps3",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
        },
        [DB8500_REGULATOR_VRF1] = {
                .constraints = {
                        .name = "db8500-vrf1",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
        },
        [DB8500_REGULATOR_SWITCH_SVAMMDSP] = {
                /* dependency to u8500-vape is handled outside regulator framework */
                .constraints = {
                        .name = "db8500-sva-mmdsp",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
                .consumer_supplies = db8500_svammdsp_consumers,
                .num_consumer_supplies = ARRAY_SIZE(db8500_svammdsp_consumers),
        },
        [DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = {
                .constraints = {
                        /* "ret" means "retention" */
                        .name = "db8500-sva-mmdsp-ret",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
        },
        [DB8500_REGULATOR_SWITCH_SVAPIPE] = {
                /* dependency to u8500-vape is handled outside regulator framework */
                .constraints = {
                        .name = "db8500-sva-pipe",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
                .consumer_supplies = db8500_svapipe_consumers,
                .num_consumer_supplies = ARRAY_SIZE(db8500_svapipe_consumers),
        },
        [DB8500_REGULATOR_SWITCH_SIAMMDSP] = {
                /* dependency to u8500-vape is handled outside regulator framework */
                .constraints = {
                        .name = "db8500-sia-mmdsp",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
                .consumer_supplies = db8500_siammdsp_consumers,
                .num_consumer_supplies = ARRAY_SIZE(db8500_siammdsp_consumers),
        },
        [DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = {
                .constraints = {
                        .name = "db8500-sia-mmdsp-ret",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
        },
        [DB8500_REGULATOR_SWITCH_SIAPIPE] = {
                /* dependency to u8500-vape is handled outside regulator framework */
                .constraints = {
                        .name = "db8500-sia-pipe",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
                .consumer_supplies = db8500_siapipe_consumers,
                .num_consumer_supplies = ARRAY_SIZE(db8500_siapipe_consumers),
        },
        [DB8500_REGULATOR_SWITCH_SGA] = {
                .supply_regulator = "db8500-vape",
                .constraints = {
                        .name = "db8500-sga",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
                .consumer_supplies = db8500_sga_consumers,
                .num_consumer_supplies = ARRAY_SIZE(db8500_sga_consumers),

        },
        [DB8500_REGULATOR_SWITCH_B2R2_MCDE] = {
                .supply_regulator = "db8500-vape",
                .constraints = {
                        .name = "db8500-b2r2-mcde",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
                .consumer_supplies = db8500_b2r2_mcde_consumers,
                .num_consumer_supplies = ARRAY_SIZE(db8500_b2r2_mcde_consumers),
        },
        [DB8500_REGULATOR_SWITCH_ESRAM12] = {
                /*
                 * esram12 is set in retention and supplied by Vsafe when Vape is off,
                 * no need to hold Vape
                 */
                .constraints = {
                        .name = "db8500-esram12",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
                .consumer_supplies = db8500_esram12_consumers,
                .num_consumer_supplies = ARRAY_SIZE(db8500_esram12_consumers),
        },
        [DB8500_REGULATOR_SWITCH_ESRAM12RET] = {
                .constraints = {
                        .name = "db8500-esram12-ret",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
        },
        [DB8500_REGULATOR_SWITCH_ESRAM34] = {
                /*
                 * esram34 is set in retention and supplied by Vsafe when Vape is off,
                 * no need to hold Vape
                 */
                .constraints = {
                        .name = "db8500-esram34",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
                },
                .consumer_supplies = db8500_esram34_consumers,
                .num_consumer_supplies = ARRAY_SIZE(db8500_esram34_consumers),
        },
        [DB8500_REGULATOR_SWITCH_ESRAM34RET] = {
                .constraints = {
                        .name = "db8500-esram34-ret",
                        .valid_ops_mask = REGULATOR_CHANGE_STATUS,

                },
        },
};

static struct resource ab8500_resources[] = {
        [0] = {
                .start  = IRQ_DB8500_AB8500,
                .end    = IRQ_DB8500_AB8500,
                .flags  = IORESOURCE_IRQ
        }
};

static struct mfd_cell db8500_prcmu_devs[] = {
        {
                .name = "db8500-prcmu-regulators",
                .of_compatible = "stericsson,db8500-prcmu-regulator",
                .platform_data = &db8500_regulators,
                .pdata_size = sizeof(db8500_regulators),
        },
        {
                .name = "cpufreq-u8500",
                .of_compatible = "stericsson,cpufreq-u8500",
        },
        {
                .name = "ab8500-core",
                .of_compatible = "stericsson,ab8500",
                .num_resources = ARRAY_SIZE(ab8500_resources),
                .resources = ab8500_resources,
                .id = AB8500_VERSION_AB8500,
        },
};

/**
 * prcmu_fw_init - arch init call for the Linux PRCMU fw init logic
 *
 */
static int __devinit db8500_prcmu_probe(struct platform_device *pdev)
{
        struct ab8500_platform_data *ab8500_platdata = pdev->dev.platform_data;
        struct device_node *np = pdev->dev.of_node;
        int irq = 0, err = 0, i;

        if (ux500_is_svp())
                return -ENODEV;

        init_prcm_registers();

        /* Clean up the mailbox interrupts after pre-kernel code. */
        writel(ALL_MBOX_BITS, PRCM_ARM_IT1_CLR);

        if (np)
                irq = platform_get_irq(pdev, 0);

        if (!np || irq <= 0)
                irq = IRQ_DB8500_PRCMU1;

        err = request_threaded_irq(irq, prcmu_irq_handler,
                prcmu_irq_thread_fn, IRQF_NO_SUSPEND, "prcmu", NULL);
        if (err < 0) {
                pr_err("prcmu: Failed to allocate IRQ_DB8500_PRCMU1.\n");
                err = -EBUSY;
                goto no_irq_return;
        }

        db8500_irq_init(np);

        for (i = 0; i < ARRAY_SIZE(db8500_prcmu_devs); i++) {
                if (!strcmp(db8500_prcmu_devs[i].name, "ab8500-core")) {
                        db8500_prcmu_devs[i].platform_data = ab8500_platdata;
                        db8500_prcmu_devs[i].pdata_size = sizeof(struct ab8500_platform_data);
                }
        }

        if (cpu_is_u8500v20_or_later())
                prcmu_config_esram0_deep_sleep(ESRAM0_DEEP_SLEEP_STATE_RET);

        err = mfd_add_devices(&pdev->dev, 0, db8500_prcmu_devs,
                              ARRAY_SIZE(db8500_prcmu_devs), NULL, 0, NULL);
        if (err) {
                pr_err("prcmu: Failed to add subdevices\n");
                return err;
        }

        pr_info("DB8500 PRCMU initialized\n");

no_irq_return:
        return err;
}
static const struct of_device_id db8500_prcmu_match[] = {
        { .compatible = "stericsson,db8500-prcmu"},
        { },
};

static struct platform_driver db8500_prcmu_driver = {
        .driver = {
                .name = "db8500-prcmu",
                .owner = THIS_MODULE,
                .of_match_table = db8500_prcmu_match,
        },
        .probe = db8500_prcmu_probe,
};

static int __init db8500_prcmu_init(void)
{
        return platform_driver_register(&db8500_prcmu_driver);
}

core_initcall(db8500_prcmu_init);

MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com>");
MODULE_DESCRIPTION("DB8500 PRCM Unit driver");
MODULE_LICENSE("GPL v2");