/* SPDX-License-Identifier: GPL-2.0 */
/*
 * MUSB OTG driver defines
 *
 * Copyright 2005 Mentor Graphics Corporation
 * Copyright (C) 2005-2006 by Texas Instruments
 * Copyright (C) 2006-2007 Nokia Corporation
 */

#ifndef __MUSB_CORE_H__
#define __MUSB_CORE_H__

#include <linux/slab.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <linux/device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb.h>
#include <linux/usb/otg.h>
#include <linux/usb/musb.h>
#include <linux/phy/phy.h>
#include <linux/workqueue.h>

struct musb;
struct musb_hw_ep;
struct musb_ep;
struct musb_qh;

/* Helper defines for struct musb->hwvers */
#define MUSB_HWVERS_MAJOR(x)    ((x >> 10) & 0x1f)
#define MUSB_HWVERS_MINOR(x)    (x & 0x3ff)
#define MUSB_HWVERS_RC          0x8000
#define MUSB_HWVERS_1300        0x52C
#define MUSB_HWVERS_1400        0x590
#define MUSB_HWVERS_1800        0x720
#define MUSB_HWVERS_1900        0x784
#define MUSB_HWVERS_2000        0x800

#include "musb_debug.h"
#include "musb_dma.h"

#include "musb_io.h"

#include "musb_gadget.h"
#include <linux/usb/hcd.h>
#include "musb_host.h"

/* NOTE:  otg and peripheral-only state machines start at B_IDLE.
 * OTG or host-only go to A_IDLE when ID is sensed.
 */
#define is_peripheral_active(m)         (!(m)->is_host)
#define is_host_active(m)               ((m)->is_host)

/****************************** CONSTANTS ********************************/

#ifndef MUSB_C_NUM_EPS
#define MUSB_C_NUM_EPS ((u8)16)
#endif

#ifndef MUSB_MAX_END0_PACKET
#define MUSB_MAX_END0_PACKET ((u16)MUSB_EP0_FIFOSIZE)
#endif

/* host side ep0 states */
enum musb_h_ep0_state {
        MUSB_EP0_IDLE,
        MUSB_EP0_START,                 /* expect ack of setup */
        MUSB_EP0_IN,                    /* expect IN DATA */
        MUSB_EP0_OUT,                   /* expect ack of OUT DATA */
        MUSB_EP0_STATUS,                /* expect ack of STATUS */
} __attribute__ ((packed));

/* peripheral side ep0 states */
enum musb_g_ep0_state {
        MUSB_EP0_STAGE_IDLE,            /* idle, waiting for SETUP */
        MUSB_EP0_STAGE_SETUP,           /* received SETUP */
        MUSB_EP0_STAGE_TX,              /* IN data */
        MUSB_EP0_STAGE_RX,              /* OUT data */
        MUSB_EP0_STAGE_STATUSIN,        /* (after OUT data) */
        MUSB_EP0_STAGE_STATUSOUT,       /* (after IN data) */
        MUSB_EP0_STAGE_ACKWAIT,         /* after zlp, before statusin */
} __attribute__ ((packed));

/*
 * OTG protocol constants.  See USB OTG 1.3 spec,
 * sections 5.5 "Device Timings" and 6.6.5 "Timers".
 */
#define OTG_TIME_A_WAIT_VRISE   100             /* msec (max) */
#define OTG_TIME_A_WAIT_BCON    1100            /* min 1 second */
#define OTG_TIME_A_AIDL_BDIS    200             /* min 200 msec */
#define OTG_TIME_B_ASE0_BRST    100             /* min 3.125 ms */

/****************************** FUNCTIONS ********************************/

#define MUSB_HST_MODE(_musb)\
        { (_musb)->is_host = true; }
#define MUSB_DEV_MODE(_musb) \
        { (_musb)->is_host = false; }

#define test_devctl_hst_mode(_x) \
        (musb_readb((_x)->mregs, MUSB_DEVCTL)&MUSB_DEVCTL_HM)

#define MUSB_MODE(musb) ((musb)->is_host ? "Host" : "Peripheral")

/******************************** TYPES *************************************/

struct musb_io;

/**
 * struct musb_platform_ops - Operations passed to musb_core by HW glue layer
 * @quirks:     flags for platform specific quirks
 * @enable:     enable device
 * @disable:    disable device
 * @ep_offset:  returns the end point offset
 * @ep_select:  selects the specified end point
 * @fifo_mode:  sets the fifo mode
 * @fifo_offset: returns the fifo offset
 * @readb:      read 8 bits
 * @writeb:     write 8 bits
 * @clearb:     could be clear-on-readb or W1C
 * @readw:      read 16 bits
 * @writew:     write 16 bits
 * @clearw:     could be clear-on-readw or W1C
 * @read_fifo:  reads the fifo
 * @write_fifo: writes to fifo
 * @get_toggle: platform specific get toggle function
 * @set_toggle: platform specific set toggle function
 * @dma_init:   platform specific dma init function
 * @dma_exit:   platform specific dma exit function
 * @init:       turns on clocks, sets up platform-specific registers, etc
 * @exit:       undoes @init
 * @set_mode:   forcefully changes operating mode
 * @try_idle:   tries to idle the IP
 * @recover:    platform-specific babble recovery
 * @vbus_status: returns vbus status if possible
 * @set_vbus:   forces vbus status
 * @pre_root_reset_end: called before the root usb port reset flag gets cleared
 * @post_root_reset_end: called after the root usb port reset flag gets cleared
 * @phy_callback: optional callback function for the phy to call
 */
struct musb_platform_ops {

#define MUSB_G_NO_SKB_RESERVE   BIT(9)
#define MUSB_DA8XX              BIT(8)
#define MUSB_PRESERVE_SESSION   BIT(7)
#define MUSB_DMA_UX500          BIT(6)
#define MUSB_DMA_CPPI41         BIT(5)
#define MUSB_DMA_CPPI           BIT(4)
#define MUSB_DMA_TUSB_OMAP      BIT(3)
#define MUSB_DMA_INVENTRA       BIT(2)
#define MUSB_IN_TUSB            BIT(1)
#define MUSB_INDEXED_EP         BIT(0)
        u32     quirks;

        int     (*init)(struct musb *musb);
        int     (*exit)(struct musb *musb);

        void    (*enable)(struct musb *musb);
        void    (*disable)(struct musb *musb);

        u32     (*ep_offset)(u8 epnum, u16 offset);
        void    (*ep_select)(void __iomem *mbase, u8 epnum);
        u16     fifo_mode;
        u32     (*fifo_offset)(u8 epnum);
        u32     (*busctl_offset)(u8 epnum, u16 offset);
        u8      (*readb)(void __iomem *addr, u32 offset);
        void    (*writeb)(void __iomem *addr, u32 offset, u8 data);
        u8      (*clearb)(void __iomem *addr, u32 offset);
        u16     (*readw)(void __iomem *addr, u32 offset);
        void    (*writew)(void __iomem *addr, u32 offset, u16 data);
        u16     (*clearw)(void __iomem *addr, u32 offset);
        void    (*read_fifo)(struct musb_hw_ep *hw_ep, u16 len, u8 *buf);
        void    (*write_fifo)(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf);
        u16     (*get_toggle)(struct musb_qh *qh, int is_out);
        u16     (*set_toggle)(struct musb_qh *qh, int is_out, struct urb *urb);
        struct dma_controller *
                (*dma_init) (struct musb *musb, void __iomem *base);
        void    (*dma_exit)(struct dma_controller *c);
        int     (*set_mode)(struct musb *musb, u8 mode);
        void    (*try_idle)(struct musb *musb, unsigned long timeout);
        int     (*recover)(struct musb *musb);

        int     (*vbus_status)(struct musb *musb);
        void    (*set_vbus)(struct musb *musb, int on);

        void    (*pre_root_reset_end)(struct musb *musb);
        void    (*post_root_reset_end)(struct musb *musb);
        int     (*phy_callback)(enum musb_vbus_id_status status);
        void    (*clear_ep_rxintr)(struct musb *musb, int epnum);
};

/*
 * struct musb_hw_ep - endpoint hardware (bidirectional)
 *
 * Ordered slightly for better cacheline locality.
 */
struct musb_hw_ep {
        struct musb             *musb;
        void __iomem            *fifo;
        void __iomem            *regs;

#if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
        void __iomem            *conf;
#endif

        /* index in musb->endpoints[]  */
        u8                      epnum;

        /* hardware configuration, possibly dynamic */
        bool                    is_shared_fifo;
        bool                    tx_double_buffered;
        bool                    rx_double_buffered;
        u16                     max_packet_sz_tx;
        u16                     max_packet_sz_rx;

        struct dma_channel      *tx_channel;
        struct dma_channel      *rx_channel;

#if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
        /* TUSB has "asynchronous" and "synchronous" dma modes */
        dma_addr_t              fifo_async;
        dma_addr_t              fifo_sync;
        void __iomem            *fifo_sync_va;
#endif

        /* currently scheduled peripheral endpoint */
        struct musb_qh          *in_qh;
        struct musb_qh          *out_qh;

        u8                      rx_reinit;
        u8                      tx_reinit;

        /* peripheral side */
        struct musb_ep          ep_in;                  /* TX */
        struct musb_ep          ep_out;                 /* RX */
};

static inline struct musb_request *next_in_request(struct musb_hw_ep *hw_ep)
{
        return next_request(&hw_ep->ep_in);
}

static inline struct musb_request *next_out_request(struct musb_hw_ep *hw_ep)
{
        return next_request(&hw_ep->ep_out);
}

struct musb_csr_regs {
        /* FIFO registers */
        u16 txmaxp, txcsr, rxmaxp, rxcsr;
        u16 rxfifoadd, txfifoadd;
        u8 txtype, txinterval, rxtype, rxinterval;
        u8 rxfifosz, txfifosz;
        u8 txfunaddr, txhubaddr, txhubport;
        u8 rxfunaddr, rxhubaddr, rxhubport;
};

struct musb_context_registers {

        u8 power;
        u8 intrusbe;
        u16 frame;
        u8 index, testmode;

        u8 devctl, busctl, misc;
        u32 otg_interfsel;

        struct musb_csr_regs index_regs[MUSB_C_NUM_EPS];
};

/*
 * struct musb - Driver instance data.
 */
struct musb {
        /* device lock */
        spinlock_t              lock;
        spinlock_t              list_lock;      /* resume work list lock */

        struct musb_io          io;
        const struct musb_platform_ops *ops;
        struct musb_context_registers context;

        irqreturn_t             (*isr)(int, void *);
        struct delayed_work     irq_work;
        struct delayed_work     deassert_reset_work;
        struct delayed_work     finish_resume_work;
        struct delayed_work     gadget_work;
        u16                     hwvers;

        u16                     intrrxe;
        u16                     intrtxe;
/* this hub status bit is reserved by USB 2.0 and not seen by usbcore */
#define MUSB_PORT_STAT_RESUME   (1 << 31)

        u32                     port1_status;

        unsigned long           rh_timer;

        enum musb_h_ep0_state   ep0_stage;

        /* bulk traffic normally dedicates endpoint hardware, and each
         * direction has its own ring of host side endpoints.
         * we try to progress the transfer at the head of each endpoint's
         * queue until it completes or NAKs too much; then we try the next
         * endpoint.
         */
        struct musb_hw_ep       *bulk_ep;

        struct list_head        control;        /* of musb_qh */
        struct list_head        in_bulk;        /* of musb_qh */
        struct list_head        out_bulk;       /* of musb_qh */
        struct list_head        pending_list;   /* pending work list */

        struct timer_list       otg_timer;
        struct timer_list       dev_timer;
        struct notifier_block   nb;

        struct dma_controller   *dma_controller;

        struct device           *controller;
        void __iomem            *ctrl_base;
        void __iomem            *mregs;

#if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
        dma_addr_t              async;
        dma_addr_t              sync;
        void __iomem            *sync_va;
        u8                      tusb_revision;
#endif

        /* passed down from chip/board specific irq handlers */
        u8                      int_usb;
        u16                     int_rx;
        u16                     int_tx;

        struct usb_phy          *xceiv;
        struct phy              *phy;

        enum usb_otg_state      otg_state;

        int nIrq;
        unsigned                irq_wake:1;

        struct musb_hw_ep        endpoints[MUSB_C_NUM_EPS];
#define control_ep              endpoints

#define VBUSERR_RETRY_COUNT     3
        u16                     vbuserr_retry;
        u16 epmask;
        u8 nr_endpoints;

        u8                      min_power;      /* vbus for periph, in mA/2 */

        enum musb_mode          port_mode;
        bool                    session;
        unsigned long           quirk_retries;
        bool                    is_host;

        int                     a_wait_bcon;    /* VBUS timeout in msecs */
        unsigned long           idle_timeout;   /* Next timeout in jiffies */

        unsigned                is_initialized:1;
        unsigned                is_runtime_suspended:1;

        /* active means connected and not suspended */
        unsigned                is_active:1;

        unsigned is_multipoint:1;

        unsigned                hb_iso_rx:1;    /* high bandwidth iso rx? */
        unsigned                hb_iso_tx:1;    /* high bandwidth iso tx? */
        unsigned                dyn_fifo:1;     /* dynamic FIFO supported? */

        unsigned                bulk_split:1;
#define can_bulk_split(musb, type) \
        (((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_split)

        unsigned                bulk_combine:1;
#define can_bulk_combine(musb, type) \
        (((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_combine)

        /* is_suspended means USB B_PERIPHERAL suspend */
        unsigned                is_suspended:1;

        /* may_wakeup means remote wakeup is enabled */
        unsigned                may_wakeup:1;

        /* is_self_powered is reported in device status and the
         * config descriptor.  is_bus_powered means B_PERIPHERAL
         * draws some VBUS current; both can be true.
         */
        unsigned                is_self_powered:1;
        unsigned                is_bus_powered:1;

        unsigned                set_address:1;
        unsigned                test_mode:1;
        unsigned                softconnect:1;

        unsigned                flush_irq_work:1;

        u8                      address;
        u8                      test_mode_nr;
        u16                     ackpend;                /* ep0 */
        enum musb_g_ep0_state   ep0_state;
        struct usb_gadget       g;                      /* the gadget */
        struct usb_gadget_driver *gadget_driver;        /* its driver */
        struct usb_hcd          *hcd;                   /* the usb hcd */

        const struct musb_hdrc_config *config;

        int                     xceiv_old_state;
#ifdef CONFIG_DEBUG_FS
        struct dentry           *debugfs_root;
#endif
};

/* This must be included after struct musb is defined */
#include "musb_regs.h"

static inline struct musb *gadget_to_musb(struct usb_gadget *g)
{
        return container_of(g, struct musb, g);
}

static inline char *musb_ep_xfertype_string(u8 type)
{
        char *s;

        switch (type) {
        case USB_ENDPOINT_XFER_CONTROL:
                s = "ctrl";
                break;
        case USB_ENDPOINT_XFER_ISOC:
                s = "iso";
                break;
        case USB_ENDPOINT_XFER_BULK:
                s = "bulk";
                break;
        case USB_ENDPOINT_XFER_INT:
                s = "int";
                break;
        default:
                s = "";
                break;
        }
        return s;
}

static inline int musb_read_fifosize(struct musb *musb,
                struct musb_hw_ep *hw_ep, u8 epnum)
{
        void __iomem *mbase = musb->mregs;
        u8 reg = 0;

        /* read from core using indexed model */
        reg = musb_readb(mbase, musb->io.ep_offset(epnum, MUSB_FIFOSIZE));
        /* 0's returned when no more endpoints */
        if (!reg)
                return -ENODEV;

        musb->nr_endpoints++;
        musb->epmask |= (1 << epnum);

        hw_ep->max_packet_sz_tx = 1 << (reg & 0x0f);

        /* shared TX/RX FIFO? */
        if ((reg & 0xf0) == 0xf0) {
                hw_ep->max_packet_sz_rx = hw_ep->max_packet_sz_tx;
                hw_ep->is_shared_fifo = true;
                return 0;
        } else {
                hw_ep->max_packet_sz_rx = 1 << ((reg & 0xf0) >> 4);
                hw_ep->is_shared_fifo = false;
        }

        return 0;
}

static inline void musb_configure_ep0(struct musb *musb)
{
        musb->endpoints[0].max_packet_sz_tx = MUSB_EP0_FIFOSIZE;
        musb->endpoints[0].max_packet_sz_rx = MUSB_EP0_FIFOSIZE;
        musb->endpoints[0].is_shared_fifo = true;
}

/***************************** Glue it together *****************************/

extern const char musb_driver_name[];

extern void musb_stop(struct musb *musb);
extern void musb_start(struct musb *musb);

extern void musb_write_fifo(struct musb_hw_ep *ep, u16 len, const u8 *src);
extern void musb_read_fifo(struct musb_hw_ep *ep, u16 len, u8 *dst);

extern int musb_set_host(struct musb *musb);
extern int musb_set_peripheral(struct musb *musb);

extern void musb_load_testpacket(struct musb *);

extern irqreturn_t musb_interrupt(struct musb *);

extern void musb_hnp_stop(struct musb *musb);

int musb_queue_resume_work(struct musb *musb,
                           int (*callback)(struct musb *musb, void *data),
                           void *data);

static inline void musb_platform_set_vbus(struct musb *musb, int is_on)
{
        if (musb->ops->set_vbus)
                musb->ops->set_vbus(musb, is_on);
}

static inline void musb_platform_enable(struct musb *musb)
{
        if (musb->ops->enable)
                musb->ops->enable(musb);
}

static inline void musb_platform_disable(struct musb *musb)
{
        if (musb->ops->disable)
                musb->ops->disable(musb);
}

static inline int musb_platform_set_mode(struct musb *musb, u8 mode)
{
        if (!musb->ops->set_mode)
                return 0;

        return musb->ops->set_mode(musb, mode);
}

static inline void musb_platform_try_idle(struct musb *musb,
                unsigned long timeout)
{
        if (musb->ops->try_idle)
                musb->ops->try_idle(musb, timeout);
}

static inline int  musb_platform_recover(struct musb *musb)
{
        if (!musb->ops->recover)
                return 0;

        return musb->ops->recover(musb);
}

static inline int musb_platform_get_vbus_status(struct musb *musb)
{
        if (!musb->ops->vbus_status)
                return -EINVAL;

        return musb->ops->vbus_status(musb);
}

static inline int musb_platform_init(struct musb *musb)
{
        if (!musb->ops->init)
                return -EINVAL;

        return musb->ops->init(musb);
}

static inline int musb_platform_exit(struct musb *musb)
{
        if (!musb->ops->exit)
                return -EINVAL;

        return musb->ops->exit(musb);
}

static inline void musb_platform_pre_root_reset_end(struct musb *musb)
{
        if (musb->ops->pre_root_reset_end)
                musb->ops->pre_root_reset_end(musb);
}

static inline void musb_platform_post_root_reset_end(struct musb *musb)
{
        if (musb->ops->post_root_reset_end)
                musb->ops->post_root_reset_end(musb);
}

static inline void musb_platform_clear_ep_rxintr(struct musb *musb, int epnum)
{
        if (musb->ops->clear_ep_rxintr)
                musb->ops->clear_ep_rxintr(musb, epnum);
}

static inline void musb_set_state(struct musb *musb,
                                  enum usb_otg_state otg_state)
{
        if (musb->xceiv)
                musb->xceiv->otg->state = otg_state;
        else
                musb->otg_state = otg_state;
}

static inline enum usb_otg_state musb_get_state(struct musb *musb)
{
        if (musb->xceiv)
                return musb->xceiv->otg->state;

        return musb->otg_state;
}

static inline const char *musb_otg_state_string(struct musb *musb)
{
        return usb_otg_state_string(musb_get_state(musb));
}

/*
 * gets the "dr_mode" property from DT and converts it into musb_mode
 * if the property is not found or not recognized returns MUSB_OTG
 */
extern enum musb_mode musb_get_mode(struct device *dev);

#endif  /* __MUSB_CORE_H__ */