/*
 * ci.h - common structures, functions, and macros of the ChipIdea driver
 *
 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
 *
 * Author: David Lopo
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#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>

/******************************************************************************
 * DEFINE
 *****************************************************************************/
#define CI13XXX_PAGE_SIZE  4096ul /* page size for TD's */
#define ENDPT_MAX          32

/******************************************************************************
 * STRUCTURES
 *****************************************************************************/
/**
 * struct ci13xxx_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 ci13xxx_ep {
        struct usb_ep                           ep;
        u8                                      dir;
        u8                                      num;
        u8                                      type;
        char                                    name[16];
        struct {
                struct list_head        queue;
                struct ci13xxx_qh       *ptr;
                dma_addr_t              dma;
        }                                       qh;
        int                                     wedge;

        /* global resources */
        struct ci13xxx                          *ci;
        spinlock_t                              *lock;
        struct dma_pool                         *td_pool;
};

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

/**
 * struct ci_role_driver - host/gadget role driver
 * start: start this role
 * stop: stop this role
 * irq: irq handler for this role
 * name: role name string (host/gadget)
 */
struct ci_role_driver {
        int             (*start)(struct ci13xxx *);
        void            (*stop)(struct ci13xxx *);
        irqreturn_t     (*irq)(struct ci13xxx *);
        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;
};

/**
 * struct ci13xxx - 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
 * @work: work for role changing
 * @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
 * @hw_ep_max: total number of endpoints supported by hardware
 * @ci13xxx_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
 * @transceiver: pointer to USB PHY, if any
 * @hcd: pointer to usb_hcd for ehci host driver
 */
struct ci13xxx {
        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 work_struct              work;
        struct work_struct              vbus_work;
        struct workqueue_struct         *wq;

        struct dma_pool                 *qh_pool;
        struct dma_pool                 *td_pool;

        struct usb_gadget               gadget;
        struct usb_gadget_driver        *driver;
        unsigned                        hw_ep_max;
        struct ci13xxx_ep               ci13xxx_ep[ENDPT_MAX];
        u32                             ep0_dir;
        struct ci13xxx_ep               *ep0out, *ep0in;

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

        struct ci13xxx_platform_data    *platdata;
        int                             vbus_active;
        /* FIXME: some day, we'll not use global phy */
        bool                            global_phy;
        struct usb_phy                  *transceiver;
        struct usb_hcd                  *hcd;
};

static inline struct ci_role_driver *ci_role(struct ci13xxx *ci)
{
        BUG_ON(ci->role >= CI_ROLE_END || !ci->roles[ci->role]);
        return ci->roles[ci->role];
}

static inline int ci_role_start(struct ci13xxx *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)
                ci->role = role;
        return ret;
}

static inline void ci_role_stop(struct ci13xxx *ci)
{
        enum ci_role role = ci->role;

        if (role == CI_ROLE_END)
                return;

        ci->role = CI_ROLE_END;

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

/******************************************************************************
 * REGISTERS
 *****************************************************************************/
/* register size */
#define REG_BITS   (32)

/* register indices */
enum ci13xxx_regs {
        CAP_CAPLENGTH,
        CAP_HCCPARAMS,
        CAP_DCCPARAMS,
        CAP_TESTMODE,
        CAP_LAST = CAP_TESTMODE,
        OP_USBCMD,
        OP_USBSTS,
        OP_USBINTR,
        OP_DEVICEADDR,
        OP_ENDPTLISTADDR,
        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,
};

/**
 * ffs_nr: find first (least significant) bit set
 * @x: the word to search
 *
 * This function returns bit number (instead of position)
 */
static inline int ffs_nr(u32 x)
{
        int n = ffs(x);

        return n ? n-1 : 32;
}

/**
 * hw_read: reads from a hw register
 * @reg:  register index
 * @mask: bitfield mask
 *
 * This function returns register contents
 */
static inline u32 hw_read(struct ci13xxx *ci, enum ci13xxx_regs reg, u32 mask)
{
        return ioread32(ci->hw_bank.regmap[reg]) & mask;
}

/**
 * hw_write: writes to a hw register
 * @reg:  register index
 * @mask: bitfield mask
 * @data: new value
 */
static inline void hw_write(struct ci13xxx *ci, enum ci13xxx_regs reg,
                            u32 mask, u32 data)
{
        if (~mask)
                data = (ioread32(ci->hw_bank.regmap[reg]) & ~mask)
                        | (data & mask);

        iowrite32(data, ci->hw_bank.regmap[reg]);
}

/**
 * hw_test_and_clear: tests & clears a hw register
 * @reg:  register index
 * @mask: bitfield mask
 *
 * This function returns register contents
 */
static inline u32 hw_test_and_clear(struct ci13xxx *ci, enum ci13xxx_regs reg,
                                    u32 mask)
{
        u32 val = ioread32(ci->hw_bank.regmap[reg]) & mask;

        iowrite32(val, ci->hw_bank.regmap[reg]);
        return val;
}

/**
 * hw_test_and_write: tests & writes a hw register
 * @reg:  register index
 * @mask: bitfield mask
 * @data: new value
 *
 * This function returns register contents
 */
static inline u32 hw_test_and_write(struct ci13xxx *ci, enum ci13xxx_regs reg,
                                    u32 mask, u32 data)
{
        u32 val = hw_read(ci, reg, ~0);

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

int hw_device_reset(struct ci13xxx *ci, u32 mode);

int hw_port_test_set(struct ci13xxx *ci, u8 mode);

u8 hw_port_test_get(struct ci13xxx *ci);

#endif  /* __DRIVERS_USB_CHIPIDEA_CI_H */