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/*

 * Copyright (c) 2001-2002 by David Brownell

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by the

 * Free Software Foundation; either version 2 of the License, or (at your

 * option) any later version.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software Foundation,

 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

#ifndef __LINUX_EHCI_HCD_H

#define __LINUX_EHCI_HCD_H

/* definitions used for the EHCI driver */

/* statistics can be kept for for tuning/monitoring */

struct ehci_stats {

        /* irq usage */

        unsigned long           normal;

        unsigned long           error;

        unsigned long           reclaim;

        unsigned long           lost_iaa;

        /* termination of urbs from core */

        unsigned long           complete;

        unsigned long           unlink;

};

/* ehci_hcd->lock guards shared data against other CPUs:

 *   ehci_hcd:  async, reclaim, periodic (and shadow), ...

 *   hcd_dev:   ep[]

 *   ehci_qh:   qh_next, qtd_list

 *   ehci_qtd:  qtd_list

 *

 * Also, hold this lock when talking to HC registers or

 * when updating hw_* fields in shared qh/qtd/... structures.

 */

#define EHCI_MAX_ROOT_PORTS     15              /* see HCS_N_PORTS */

struct ehci_hcd {                       /* one per controller */

        spinlock_t              lock;

        /* async schedule support */

        struct ehci_qh          *async;

        struct ehci_qh          *reclaim;

        int                     reclaim_ready : 1;

        /* periodic schedule support */

#define DEFAULT_I_TDPS          1024            /* some HCs can do less */

        unsigned                periodic_size;

        u32                     *periodic;      /* hw periodic table */

        dma_addr_t              periodic_dma;

        unsigned                i_thresh;       /* uframes HC might cache */

        union ehci_shadow       *pshadow;       /* mirror hw periodic table */

        int                     next_uframe;    /* scan periodic, start here */

        unsigned                periodic_sched; /* periodic activity count */

        /* per root hub port */

        unsigned long           reset_done [EHCI_MAX_ROOT_PORTS];

        /* glue to PCI and HCD framework */

        struct usb_hcd          hcd;

        struct ehci_caps        *caps;

        struct ehci_regs        *regs;

        u32                     hcs_params;     /* cached register copy */

        /* per-HC memory pools (could be per-PCI-bus, but ...) */

        struct pci_pool         *qh_pool;       /* qh per active urb */

        struct pci_pool         *qtd_pool;      /* one or more per qh */

        struct pci_pool         *itd_pool;      /* itd per iso urb */

        struct pci_pool         *sitd_pool;     /* sitd per split iso urb */

        struct timer_list       watchdog;

        struct notifier_block   reboot_notifier;

        unsigned long           actions;

        unsigned                stamp;

        /* irq statistics */

#ifdef EHCI_STATS

        struct ehci_stats       stats;

#       define COUNT(x) do { (x)++; } while (0)

#else

#       define COUNT(x) do {} while (0)

#endif

};

/* unwrap an HCD pointer to get an EHCI_HCD pointer */

#define hcd_to_ehci(hcd_ptr) container_of(hcd_ptr, struct ehci_hcd, hcd)

/* NOTE:  urb->transfer_flags expected to not use this bit !!! */

#define EHCI_STATE_UNLINK       0x8000          /* urb being unlinked */

enum ehci_timer_action {

        TIMER_IO_WATCHDOG,

        TIMER_IAA_WATCHDOG,

        TIMER_ASYNC_SHRINK,

        TIMER_ASYNC_OFF,

};

static inline void

timer_action_done (struct ehci_hcd *ehci, enum ehci_timer_action action)

{

        clear_bit (action, &ehci->actions);

}

static inline void

timer_action (struct ehci_hcd *ehci, enum ehci_timer_action action)

{

        if (!test_and_set_bit (action, &ehci->actions)) {

                unsigned long t;

                switch (action) {

                case TIMER_IAA_WATCHDOG:

                        t = EHCI_IAA_JIFFIES;

                        break;

                case TIMER_IO_WATCHDOG:

                        t = EHCI_IO_JIFFIES;

                        break;

                case TIMER_ASYNC_OFF:

                        t = EHCI_ASYNC_JIFFIES;

                        break;

                // case TIMER_ASYNC_SHRINK:

                default:

                        t = EHCI_SHRINK_JIFFIES;

                        break;

                }

                t += jiffies26;

                // all timings except IAA watchdog can be overridden.

                // async queue SHRINK often precedes IAA.  while it's ready

                // to go OFF neither can matter, and afterwards the IO

                // watchdog stops unless there's still periodic traffic.

                if (action != TIMER_IAA_WATCHDOG

                                && t > ehci->watchdog.expires

                                && timer_pending (&ehci->watchdog))

                        return;

                mod_timer (&ehci->watchdog, t);

        }

}

/*-------------------------------------------------------------------------*/

/* EHCI register interface, corresponds to EHCI Revision 0.95 specification */

/* Section 2.2 Host Controller Capability Registers */

struct ehci_caps {

        u8              length;         /* CAPLENGTH - size of this struct */

        u8              reserved;       /* offset 0x1 */

        u16             hci_version;    /* HCIVERSION - offset 0x2 */

        u32             hcs_params;     /* HCSPARAMS - offset 0x4 */

#define HCS_DEBUG_PORT(p)       (((p)>>20)&0xf) /* bits 23:20, debug port? */

#define HCS_INDICATOR(p)        ((p)&(1 << 16)) /* true: has port indicators */

#define HCS_N_CC(p)             (((p)>>12)&0xf) /* bits 15:12, #companion HCs */

#define HCS_N_PCC(p)            (((p)>>8)&0xf)  /* bits 11:8, ports per CC */

#define HCS_PORTROUTED(p)       ((p)&(1 << 7))  /* true: port routing */ 

#define HCS_PPC(p)              ((p)&(1 << 4))  /* true: port power control */ 

#define HCS_N_PORTS(p)          (((p)>>0)&0xf)  /* bits 3:0, ports on HC */

        u32             hcc_params;      /* HCCPARAMS - offset 0x8 */

#define HCC_EXT_CAPS(p)         (((p)>>8)&0xff) /* for pci extended caps */

#define HCC_ISOC_CACHE(p)       ((p)&(1 << 7))  /* true: can cache isoc frame */

#define HCC_ISOC_THRES(p)       (((p)>>4)&0x7)  /* bits 6:4, uframes cached */

#define HCC_CANPARK(p)          ((p)&(1 << 2))  /* true: can park on async qh */

#define HCC_PGM_FRAMELISTLEN(p) ((p)&(1 << 1))  /* true: periodic_size changes*/

#define HCC_64BIT_ADDR(p)       ((p)&(1))       /* true: can use 64-bit addr */

        u8              portroute [8];   /* nibbles for routing - offset 0xC */

} __attribute__ ((packed));

/* Section 2.3 Host Controller Operational Registers */

struct ehci_regs {

        /* USBCMD: offset 0x00 */

        u32             command;

/* 23:16 is r/w intr rate, in microframes; default "8" == 1/msec */

#define CMD_PARK        (1<<11)         /* enable "park" on async qh */

#define CMD_PARK_CNT(c) (((c)>>8)&3)    /* how many transfers to park for */

#define CMD_LRESET      (1<<7)          /* partial reset (no ports, etc) */

#define CMD_IAAD        (1<<6)          /* "doorbell" interrupt async advance */

#define CMD_ASE         (1<<5)          /* async schedule enable */

#define CMD_PSE         (1<<4)          /* periodic schedule enable */

/* 3:2 is periodic frame list size */

#define CMD_RESET       (1<<1)          /* reset HC not bus */

#define CMD_RUN         (1<<0)          /* start/stop HC */

        /* USBSTS: offset 0x04 */

        u32             status;

#define STS_ASS         (1<<15)         /* Async Schedule Status */

#define STS_PSS         (1<<14)         /* Periodic Schedule Status */

#define STS_RECL        (1<<13)         /* Reclamation */

#define STS_HALT        (1<<12)         /* Not running (any reason) */

/* some bits reserved */

        /* these STS_* flags are also intr_enable bits (USBINTR) */

#define STS_IAA         (1<<5)          /* Interrupted on async advance */

#define STS_FATAL       (1<<4)          /* such as some PCI access errors */

#define STS_FLR         (1<<3)          /* frame list rolled over */

#define STS_PCD         (1<<2)          /* port change detect */

#define STS_ERR         (1<<1)          /* "error" completion (overflow, ...) */

#define STS_INT         (1<<0)          /* "normal" completion (short, ...) */

        /* USBINTR: offset 0x08 */

        u32             intr_enable;

        /* FRINDEX: offset 0x0C */

        u32             frame_index;    /* current microframe number */

        /* CTRLDSSEGMENT: offset 0x10 */

        u32             segment;        /* address bits 63:32 if needed */

        /* PERIODICLISTBASE: offset 0x14 */

        u32             frame_list;     /* points to periodic list */

        /* ASYNCICLISTADDR: offset 0x18 */

        u32             async_next;     /* address of next async queue head */

        u32             reserved [9];

        /* CONFIGFLAG: offset 0x40 */

        u32             configured_flag;

#define FLAG_CF         (1<<0)          /* true: we'll support "high speed" */

        /* PORTSC: offset 0x44 */

        u32             port_status [0];        /* up to N_PORTS */

/* 31:23 reserved */

#define PORT_WKOC_E     (1<<22)         /* wake on overcurrent (enable) */

#define PORT_WKDISC_E   (1<<21)         /* wake on disconnect (enable) */

#define PORT_WKCONN_E   (1<<20)         /* wake on connect (enable) */

/* 19:16 for port testing */

/* 15:14 for using port indicator leds (if HCS_INDICATOR allows) */

#define PORT_OWNER      (1<<13)         /* true: companion hc owns this port */

#define PORT_POWER      (1<<12)         /* true: has power (see PPC) */

#define PORT_USB11(x) (((x)&(3<<10))==(1<<10))  /* USB 1.1 device */

/* 11:10 for detecting lowspeed devices (reset vs release ownership) */

/* 9 reserved */

#define PORT_RESET      (1<<8)          /* reset port */

#define PORT_SUSPEND    (1<<7)          /* suspend port */

#define PORT_RESUME     (1<<6)          /* resume it */

#define PORT_OCC        (1<<5)          /* over current change */

#define PORT_OC         (1<<4)          /* over current active */

#define PORT_PEC        (1<<3)          /* port enable change */

#define PORT_PE         (1<<2)          /* port enable */

#define PORT_CSC        (1<<1)          /* connect status change */

#define PORT_CONNECT    (1<<0)          /* device connected */

} __attribute__ ((packed));

/*-------------------------------------------------------------------------*/

#define QTD_NEXT(dma)   cpu_to_le32((u32)dma)

/*

 * EHCI Specification 0.95 Section 3.5

 * QTD: describe data transfer components (buffer, direction, ...)

 * See Fig 3-6 "Queue Element Transfer Descriptor Block Diagram".

 *

 * These are associated only with "QH" (Queue Head) structures,

 * used with control, bulk, and interrupt transfers.

 */

struct ehci_qtd {

        /* first part defined by EHCI spec */

        u32                     hw_next;          /* see EHCI 3.5.1 */

        u32                     hw_alt_next;      /* see EHCI 3.5.2 */

        u32                     hw_token;         /* see EHCI 3.5.3 */      

#define QTD_TOGGLE      (1 << 31)       /* data toggle */

#define QTD_LENGTH(tok) (((tok)>>16) & 0x7fff)

#define QTD_IOC         (1 << 15)       /* interrupt on complete */

#define QTD_CERR(tok)   (((tok)>>10) & 0x3)

#define QTD_PID(tok)    (((tok)>>8) & 0x3)

#define QTD_STS_ACTIVE  (1 << 7)        /* HC may execute this */

#define QTD_STS_HALT    (1 << 6)        /* halted on error */

#define QTD_STS_DBE     (1 << 5)        /* data buffer error (in HC) */

#define QTD_STS_BABBLE  (1 << 4)        /* device was babbling (qtd halted) */

#define QTD_STS_XACT    (1 << 3)        /* device gave illegal response */

#define QTD_STS_MMF     (1 << 2)        /* incomplete split transaction */

#define QTD_STS_STS     (1 << 1)        /* split transaction state */

#define QTD_STS_PING    (1 << 0)        /* issue PING? */

        u32                     hw_buf [5];        /* see EHCI 3.5.4 */

        u32                     hw_buf_hi [5];        /* Appendix B */

        /* the rest is HCD-private */

        dma_addr_t              qtd_dma;                /* qtd address */

        struct list_head        qtd_list;               /* sw qtd list */

        struct urb              *urb;                   /* qtd's urb */

        size_t                  length;                 /* length of buffer */

} __attribute__ ((aligned (32)));

/* mask NakCnt+T in qh->hw_alt_next */

#define QTD_MASK __constant_cpu_to_le32 (~0x1f)

#define IS_SHORT_READ(token) (QTD_LENGTH (token) != 0 && QTD_PID (token) == 1)

/*-------------------------------------------------------------------------*/

/* type tag from {qh,itd,sitd,fstn}->hw_next */

#define Q_NEXT_TYPE(dma) ((dma) & __constant_cpu_to_le32 (3 << 1))

/* values for that type tag */

#define Q_TYPE_ITD      __constant_cpu_to_le32 (0 << 1)

#define Q_TYPE_QH       __constant_cpu_to_le32 (1 << 1)

#define Q_TYPE_SITD     __constant_cpu_to_le32 (2 << 1)

#define Q_TYPE_FSTN     __constant_cpu_to_le32 (3 << 1)

/* next async queue entry, or pointer to interrupt/periodic QH */

#define QH_NEXT(dma)    (cpu_to_le32(((u32)dma)&~0x01f)|Q_TYPE_QH)

/* for periodic/async schedules and qtd lists, mark end of list */

#define EHCI_LIST_END   __constant_cpu_to_le32(1) /* "null pointer" to hw */

/*

 * Entries in periodic shadow table are pointers to one of four kinds

 * of data structure.  That's dictated by the hardware; a type tag is

 * encoded in the low bits of the hardware's periodic schedule.  Use

 * Q_NEXT_TYPE to get the tag.

 *

 * For entries in the async schedule, the type tag always says "qh".

 */

union ehci_shadow {

        struct ehci_qh          *qh;            /* Q_TYPE_QH */

        struct ehci_itd         *itd;           /* Q_TYPE_ITD */

        struct ehci_sitd        *sitd;          /* Q_TYPE_SITD */

        struct ehci_fstn        *fstn;          /* Q_TYPE_FSTN */

        u32                     *hw_next;       /* (all types) */

        void                    *ptr;

};

/*-------------------------------------------------------------------------*/

/*

 * EHCI Specification 0.95 Section 3.6

 * QH: describes control/bulk/interrupt endpoints

 * See Fig 3-7 "Queue Head Structure Layout".

 *

 * These appear in both the async and (for interrupt) periodic schedules.

 */

struct ehci_qh {

        /* first part defined by EHCI spec */

        u32                     hw_next;         /* see EHCI 3.6.1 */

        u32                     hw_info1;        /* see EHCI 3.6.2 */

#define QH_HEAD         0x00008000

        u32                     hw_info2;        /* see EHCI 3.6.2 */

        u32                     hw_current;      /* qtd list - see EHCI 3.6.4 */

        /* qtd overlay (hardware parts of a struct ehci_qtd) */

        u32                     hw_qtd_next;

        u32                     hw_alt_next;

        u32                     hw_token;

        u32                     hw_buf [5];

        u32                     hw_buf_hi [5];

        /* the rest is HCD-private */

        dma_addr_t              qh_dma;         /* address of qh */

        union ehci_shadow       qh_next;        /* ptr to qh; or periodic */

        struct list_head        qtd_list;       /* sw qtd list */

        struct ehci_qtd         *dummy;

        struct ehci_qh          *reclaim;       /* next to reclaim */

        atomic_t                refcount;

        unsigned                stamp;

        u8                      qh_state;

#define QH_STATE_LINKED         1               /* HC sees this */

#define QH_STATE_UNLINK         2               /* HC may still see this */

#define QH_STATE_IDLE           3               /* HC doesn't see this */

#define QH_STATE_UNLINK_WAIT    4               /* LINKED and on reclaim q */

#define QH_STATE_COMPLETING     5               /* don't touch token.HALT */

        /* periodic schedule info */

        u8                      usecs;          /* intr bandwidth */

        u8                      gap_uf;         /* uframes split/csplit gap */

        u8                      c_usecs;        /* ... split completion bw */

        unsigned short          period;         /* polling interval */

        unsigned short          start;          /* where polling starts */

#define NO_FRAME ((unsigned short)~0)                   /* pick new start */

} __attribute__ ((aligned (32)));

/*-------------------------------------------------------------------------*/

/*

 * EHCI Specification 0.95 Section 3.3

 * Fig 3-4 "Isochronous Transaction Descriptor (iTD)"

 *

 * Schedule records for high speed iso xfers

 */

struct ehci_itd {

        /* first part defined by EHCI spec */

        u32                     hw_next;           /* see EHCI 3.3.1 */

        u32                     hw_transaction [8]; /* see EHCI 3.3.2 */

#define EHCI_ISOC_ACTIVE        (1<<31)        /* activate transfer this slot */

#define EHCI_ISOC_BUF_ERR       (1<<30)        /* Data buffer error */

#define EHCI_ISOC_BABBLE        (1<<29)        /* babble detected */

#define EHCI_ISOC_XACTERR       (1<<28)        /* XactErr - transaction error */

#define EHCI_ITD_LENGTH(tok)    (((tok)>>16) & 0x7fff)

#define EHCI_ITD_IOC            (1 << 15)       /* interrupt on complete */

        u32                     hw_bufp [7];    /* see EHCI 3.3.3 */

        u32                     hw_bufp_hi [7]; /* Appendix B */

        /* the rest is HCD-private */

        dma_addr_t              itd_dma;        /* for this itd */

        union ehci_shadow       itd_next;       /* ptr to periodic q entry */

        struct urb              *urb;

        struct list_head        itd_list;       /* list of urb frames' itds */

        dma_addr_t              buf_dma;        /* frame's buffer address */

        /* for now, only one hw_transaction per itd */

        u32                     transaction;

        u16                     index;          /* in urb->iso_frame_desc */

        u16                     uframe;         /* in periodic schedule */

        u16                     usecs;

} __attribute__ ((aligned (32)));

/*-------------------------------------------------------------------------*/

/*

 * EHCI Specification 0.95 Section 3.4

 * siTD, aka split-transaction isochronous Transfer Descriptor

 *       ... describe low/full speed iso xfers through TT in hubs

 * see Figure 3-5 "Split-transaction Isochronous Transaction Descriptor (siTD)

 */

struct ehci_sitd {

        /* first part defined by EHCI spec */

        u32                     hw_next;

/* uses bit field macros above - see EHCI 0.95 Table 3-8 */

        u32                     hw_fullspeed_ep;  /* see EHCI table 3-9 */

        u32                     hw_uframe;        /* see EHCI table 3-10 */

        u32                     hw_tx_results1;   /* see EHCI table 3-11 */

        u32                     hw_tx_results2;   /* see EHCI table 3-12 */

        u32                     hw_tx_results3;   /* see EHCI table 3-12 */

        u32                     hw_backpointer;   /* see EHCI table 3-13 */

        u32                     hw_buf_hi [2];    /* Appendix B */

        /* the rest is HCD-private */

        dma_addr_t              sitd_dma;

        union ehci_shadow       sitd_next;      /* ptr to periodic q entry */

        struct urb              *urb;

        dma_addr_t              buf_dma;        /* buffer address */

        unsigned short          usecs;          /* start bandwidth */

        unsigned short          c_usecs;        /* completion bandwidth */

} __attribute__ ((aligned (32)));

/*-------------------------------------------------------------------------*/

/*

 * EHCI Specification 0.96 Section 3.7

 * Periodic Frame Span Traversal Node (FSTN)

 *

 * Manages split interrupt transactions (using TT) that span frame boundaries

 * into uframes 0/1; see 4.12.2.2.  In those uframes, a "save place" FSTN

 * makes the HC jump (back) to a QH to scan for fs/ls QH completions until

 * it hits a "restore" FSTN; then it returns to finish other uframe 0/1 work.

 */

struct ehci_fstn {

        u32                     hw_next;        /* any periodic q entry */

        u32                     hw_prev;        /* qh or EHCI_LIST_END */

        /* the rest is HCD-private */

        dma_addr_t              fstn_dma;

        union ehci_shadow       fstn_next;      /* ptr to periodic q entry */

} __attribute__ ((aligned (32)));

/*-------------------------------------------------------------------------*/

#define SUBMIT_URB(urb,mem_flags) usb_submit_urb(urb,mem_flags)

#ifndef DEBUG

#define STUB_DEBUG_FILES

#endif  /* DEBUG */

/*-------------------------------------------------------------------------*/

#endif /* __LINUX_EHCI_HCD_H */