/* SPDX-License-Identifier: GPL-2.0 */
/*
 * ci.h - common structures, functions, and macros of the ChipIdea driver
 *
 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
 *
 * Author: David Lopo
 */

#ifndef __DRIVERS_USB_CHIPIDEA_CI_H
#define __DRIVERS_USB_CHIPIDEA_CI_H

#include <linux/list.h>
#include <linux/irqreturn.h>
#include <linux/usb.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg-fsm.h>
#include <linux/usb/otg.h>
#include <linux/usb/role.h>
#include <linux/ulpi/interface.h>

/******************************************************************************
 * DEFINE
 *****************************************************************************/
#define TD_PAGE_COUNT      5
#define CI_HDRC_PAGE_SIZE  4096ul /* page size for TD's */
#define ENDPT_MAX          32
#define CI_MAX_REQ_SIZE (4 * CI_HDRC_PAGE_SIZE)
#define CI_MAX_BUF_SIZE (TD_PAGE_COUNT * CI_HDRC_PAGE_SIZE)

/******************************************************************************
 * REGISTERS
 *****************************************************************************/
/* Identification Registers */
#define ID_ID                           0x0
#define ID_HWGENERAL                    0x4
#define ID_HWHOST                       0x8
#define ID_HWDEVICE                     0xc
#define ID_HWTXBUF                      0x10
#define ID_HWRXBUF                      0x14
#define ID_SBUSCFG                      0x90

/* register indices */
enum ci_hw_regs {
        CAP_CAPLENGTH,
        CAP_HCCPARAMS,
        CAP_DCCPARAMS,
        CAP_TESTMODE,
        CAP_LAST = CAP_TESTMODE,
        OP_USBCMD,
        OP_USBSTS,
        OP_USBINTR,
        OP_FRINDEX,
        OP_DEVICEADDR,
        OP_ENDPTLISTADDR,
        OP_TTCTRL,
        OP_BURSTSIZE,
        OP_ULPI_VIEWPORT,
        OP_PORTSC,
        OP_DEVLC,
        OP_OTGSC,
        OP_USBMODE,
        OP_ENDPTSETUPSTAT,
        OP_ENDPTPRIME,
        OP_ENDPTFLUSH,
        OP_ENDPTSTAT,
        OP_ENDPTCOMPLETE,
        OP_ENDPTCTRL,
        /* endptctrl1..15 follow */
        OP_LAST = OP_ENDPTCTRL + ENDPT_MAX / 2,
};

/******************************************************************************
 * STRUCTURES
 *****************************************************************************/
/**
 * struct ci_hw_ep - endpoint representation
 * @ep: endpoint structure for gadget drivers
 * @dir: endpoint direction (TX/RX)
 * @num: endpoint number
 * @type: endpoint type
 * @name: string description of the endpoint
 * @qh: queue head for this endpoint
 * @wedge: is the endpoint wedged
 * @ci: pointer to the controller
 * @lock: pointer to controller's spinlock
 * @td_pool: pointer to controller's TD pool
 */
struct ci_hw_ep {
        struct usb_ep                           ep;
        u8                                      dir;
        u8                                      num;
        u8                                      type;
        char                                    name[16];
        struct {
                struct list_head        queue;
                struct ci_hw_qh         *ptr;
                dma_addr_t              dma;
        }                                       qh;
        int                                     wedge;

        /* global resources */
        struct ci_hdrc                          *ci;
        spinlock_t                              *lock;
        struct dma_pool                         *td_pool;
        struct td_node                          *pending_td;
};

enum ci_role {
        CI_ROLE_HOST = 0,
        CI_ROLE_GADGET,
        CI_ROLE_END,
};

enum ci_revision {
        CI_REVISION_1X = 10,    /* Revision 1.x */
        CI_REVISION_20 = 20, /* Revision 2.0 */
        CI_REVISION_21, /* Revision 2.1 */
        CI_REVISION_22, /* Revision 2.2 */
        CI_REVISION_23, /* Revision 2.3 */
        CI_REVISION_24, /* Revision 2.4 */
        CI_REVISION_25, /* Revision 2.5 */
        CI_REVISION_25_PLUS, /* Revision above than 2.5 */
        CI_REVISION_UNKNOWN = 99, /* Unknown Revision */
};

/**
 * struct ci_role_driver - host/gadget role driver
 * @start: start this role
 * @stop: stop this role
 * @suspend: system suspend handler for this role
 * @resume: system resume handler for this role
 * @irq: irq handler for this role
 * @name: role name string (host/gadget)
 */
struct ci_role_driver {
        int             (*start)(struct ci_hdrc *);
        void            (*stop)(struct ci_hdrc *);
        void            (*suspend)(struct ci_hdrc *ci);
        void            (*resume)(struct ci_hdrc *ci, bool power_lost);
        irqreturn_t     (*irq)(struct ci_hdrc *);
        const char      *name;
};

/**
 * struct hw_bank - hardware register mapping representation
 * @lpm: set if the device is LPM capable
 * @phys: physical address of the controller's registers
 * @abs: absolute address of the beginning of register window
 * @cap: capability registers
 * @op: operational registers
 * @size: size of the register window
 * @regmap: register lookup table
 */
struct hw_bank {
        unsigned        lpm;
        resource_size_t phys;
        void __iomem    *abs;
        void __iomem    *cap;
        void __iomem    *op;
        size_t          size;
        void __iomem    *regmap[OP_LAST + 1];
};

/**
 * struct ci_hdrc - chipidea device representation
 * @dev: pointer to parent device
 * @lock: access synchronization
 * @hw_bank: hardware register mapping
 * @irq: IRQ number
 * @roles: array of supported roles for this controller
 * @role: current role
 * @is_otg: if the device is otg-capable
 * @fsm: otg finite state machine
 * @otg_fsm_hrtimer: hrtimer for otg fsm timers
 * @hr_timeouts: time out list for active otg fsm timers
 * @enabled_otg_timer_bits: bits of enabled otg timers
 * @next_otg_timer: next nearest enabled timer to be expired
 * @work: work for role changing
 * @power_lost_work: work for power lost handling
 * @wq: workqueue thread
 * @qh_pool: allocation pool for queue heads
 * @td_pool: allocation pool for transfer descriptors
 * @gadget: device side representation for peripheral controller
 * @driver: gadget driver
 * @resume_state: save the state of gadget suspend from
 * @hw_ep_max: total number of endpoints supported by hardware
 * @ci_hw_ep: array of endpoints
 * @ep0_dir: ep0 direction
 * @ep0out: pointer to ep0 OUT endpoint
 * @ep0in: pointer to ep0 IN endpoint
 * @status: ep0 status request
 * @setaddr: if we should set the address on status completion
 * @address: usb address received from the host
 * @remote_wakeup: host-enabled remote wakeup
 * @suspended: suspended by host
 * @test_mode: the selected test mode
 * @platdata: platform specific information supplied by parent device
 * @vbus_active: is VBUS active
 * @ulpi: pointer to ULPI device, if any
 * @ulpi_ops: ULPI read/write ops for this device
 * @phy: pointer to PHY, if any
 * @usb_phy: pointer to USB PHY, if any and if using the USB PHY framework
 * @hcd: pointer to usb_hcd for ehci host driver
 * @id_event: indicates there is an id event, and handled at ci_otg_work
 * @b_sess_valid_event: indicates there is a vbus event, and handled
 * at ci_otg_work
 * @imx28_write_fix: Freescale imx28 needs swp instruction for writing
 * @supports_runtime_pm: if runtime pm is supported
 * @in_lpm: if the core in low power mode
 * @wakeup_int: if wakeup interrupt occur
 * @rev: The revision number for controller
 * @mutex: protect code from concorrent running when doing role switch
 */
struct ci_hdrc {
        struct device                   *dev;
        spinlock_t                      lock;
        struct hw_bank                  hw_bank;
        int                             irq;
        struct ci_role_driver           *roles[CI_ROLE_END];
        enum ci_role                    role;
        bool                            is_otg;
        struct usb_otg                  otg;
        struct otg_fsm                  fsm;
        struct hrtimer                  otg_fsm_hrtimer;
        ktime_t                         hr_timeouts[NUM_OTG_FSM_TIMERS];
        unsigned                        enabled_otg_timer_bits;
        enum otg_fsm_timer              next_otg_timer;
        struct usb_role_switch          *role_switch;
        struct work_struct              work;
        struct work_struct              power_lost_work;
        struct workqueue_struct         *wq;

        struct dma_pool                 *qh_pool;
        struct dma_pool                 *td_pool;

        struct usb_gadget               gadget;
        struct usb_gadget_driver        *driver;
        enum usb_device_state           resume_state;
        unsigned                        hw_ep_max;
        struct ci_hw_ep                 ci_hw_ep[ENDPT_MAX];
        u32                             ep0_dir;
        struct ci_hw_ep                 *ep0out, *ep0in;

        struct usb_request              *status;
        bool                            setaddr;
        u8                              address;
        u8                              remote_wakeup;
        u8                              suspended;
        u8                              test_mode;

        struct ci_hdrc_platform_data    *platdata;
        int                             vbus_active;
        struct ulpi                     *ulpi;
        struct ulpi_ops                 ulpi_ops;
        struct phy                      *phy;
        /* old usb_phy interface */
        struct usb_phy                  *usb_phy;
        struct usb_hcd                  *hcd;
        bool                            id_event;
        bool                            b_sess_valid_event;
        bool                            imx28_write_fix;
        bool                            has_portsc_pec_bug;
        bool                            has_short_pkt_limit;
        bool                            supports_runtime_pm;
        bool                            in_lpm;
        bool                            wakeup_int;
        enum ci_revision                rev;
        struct mutex                    mutex;
};

static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)
{
        BUG_ON(ci->role >= CI_ROLE_END || !ci->roles[ci->role]);
        return ci->roles[ci->role];
}

static inline int ci_role_start(struct ci_hdrc *ci, enum ci_role role)
{
        int ret;

        if (role >= CI_ROLE_END)
                return -EINVAL;

        if (!ci->roles[role])
                return -ENXIO;

        ret = ci->roles[role]->start(ci);
        if (ret)
                return ret;

        ci->role = role;

        if (ci->usb_phy) {
                if (role == CI_ROLE_HOST)
                        usb_phy_set_event(ci->usb_phy, USB_EVENT_ID);
                else
                        /* in device mode but vbus is invalid*/
                        usb_phy_set_event(ci->usb_phy, USB_EVENT_NONE);
        }

        return ret;
}

static inline void ci_role_stop(struct ci_hdrc *ci)
{
        enum ci_role role = ci->role;

        if (role == CI_ROLE_END)
                return;

        ci->role = CI_ROLE_END;

        ci->roles[role]->stop(ci);

        if (ci->usb_phy)
                usb_phy_set_event(ci->usb_phy, USB_EVENT_NONE);
}

static inline enum usb_role ci_role_to_usb_role(struct ci_hdrc *ci)
{
        if (ci->role == CI_ROLE_HOST)
                return USB_ROLE_HOST;
        else if (ci->role == CI_ROLE_GADGET && ci->vbus_active)
                return USB_ROLE_DEVICE;
        else
                return USB_ROLE_NONE;
}

static inline enum ci_role usb_role_to_ci_role(enum usb_role role)
{
        if (role == USB_ROLE_HOST)
                return CI_ROLE_HOST;
        else if (role == USB_ROLE_DEVICE)
                return CI_ROLE_GADGET;
        else
                return CI_ROLE_END;
}

/**
 * hw_read_id_reg: reads from a identification register
 * @ci: the controller
 * @offset: offset from the beginning of identification registers region
 * @mask: bitfield mask
 *
 * This function returns register contents
 */
static inline u32 hw_read_id_reg(struct ci_hdrc *ci, u32 offset, u32 mask)
{
        return ioread32(ci->hw_bank.abs + offset) & mask;
}

/**
 * hw_write_id_reg: writes to a identification register
 * @ci: the controller
 * @offset: offset from the beginning of identification registers region
 * @mask: bitfield mask
 * @data: new value
 */
static inline void hw_write_id_reg(struct ci_hdrc *ci, u32 offset,
                            u32 mask, u32 data)
{
        if (~mask)
                data = (ioread32(ci->hw_bank.abs + offset) & ~mask)
                        | (data & mask);

        iowrite32(data, ci->hw_bank.abs + offset);
}

/**
 * hw_read: reads from a hw register
 * @ci: the controller
 * @reg:  register index
 * @mask: bitfield mask
 *
 * This function returns register contents
 */
static inline u32 hw_read(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask)
{
        return ioread32(ci->hw_bank.regmap[reg]) & mask;
}

#ifdef CONFIG_SOC_IMX28
static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
{
        __asm__ ("swp %0, %0, [%1]" : : "r"(val), "r"(addr));
}
#else
static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
{
}
#endif

static inline void __hw_write(struct ci_hdrc *ci, u32 val,
                void __iomem *addr)
{
        if (ci->imx28_write_fix)
                imx28_ci_writel(val, addr);
        else
                iowrite32(val, addr);
}

/**
 * hw_write: writes to a hw register
 * @ci: the controller
 * @reg:  register index
 * @mask: bitfield mask
 * @data: new value
 */
static inline void hw_write(struct ci_hdrc *ci, enum ci_hw_regs reg,
                            u32 mask, u32 data)
{
        if (~mask)
                data = (ioread32(ci->hw_bank.regmap[reg]) & ~mask)
                        | (data & mask);

        __hw_write(ci, data, ci->hw_bank.regmap[reg]);
}

/**
 * hw_test_and_clear: tests & clears a hw register
 * @ci: the controller
 * @reg:  register index
 * @mask: bitfield mask
 *
 * This function returns register contents
 */
static inline u32 hw_test_and_clear(struct ci_hdrc *ci, enum ci_hw_regs reg,
                                    u32 mask)
{
        u32 val = ioread32(ci->hw_bank.regmap[reg]) & mask;

        __hw_write(ci, val, ci->hw_bank.regmap[reg]);
        return val;
}

/**
 * hw_test_and_write: tests & writes a hw register
 * @ci: the controller
 * @reg:  register index
 * @mask: bitfield mask
 * @data: new value
 *
 * This function returns register contents
 */
static inline u32 hw_test_and_write(struct ci_hdrc *ci, enum ci_hw_regs reg,
                                    u32 mask, u32 data)
{
        u32 val = hw_read(ci, reg, ~0);

        hw_write(ci, reg, mask, data);
        return (val & mask) >> __ffs(mask);
}

/**
 * ci_otg_is_fsm_mode: runtime check if otg controller
 * is in otg fsm mode.
 *
 * @ci: chipidea device
 */
static inline bool ci_otg_is_fsm_mode(struct ci_hdrc *ci)
{
#ifdef CONFIG_USB_OTG_FSM
        struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;

        return ci->is_otg && ci->roles[CI_ROLE_HOST] &&
                ci->roles[CI_ROLE_GADGET] && (otg_caps->srp_support ||
                otg_caps->hnp_support || otg_caps->adp_support);
#else
        return false;
#endif
}

int ci_ulpi_init(struct ci_hdrc *ci);
void ci_ulpi_exit(struct ci_hdrc *ci);
int ci_ulpi_resume(struct ci_hdrc *ci);

u32 hw_read_intr_enable(struct ci_hdrc *ci);

u32 hw_read_intr_status(struct ci_hdrc *ci);

int hw_device_reset(struct ci_hdrc *ci);

int hw_port_test_set(struct ci_hdrc *ci, u8 mode);

u8 hw_port_test_get(struct ci_hdrc *ci);

void hw_phymode_configure(struct ci_hdrc *ci);

void ci_platform_configure(struct ci_hdrc *ci);

void dbg_create_files(struct ci_hdrc *ci);

void dbg_remove_files(struct ci_hdrc *ci);
#endif  /* __DRIVERS_USB_CHIPIDEA_CI_H */