ehci.h
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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 */
- /* 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;
- /* 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_urbs; /* how many urbs scheduled? */
- /* deferred work from IRQ, etc */
- struct tasklet_struct tasklet;
- /* 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 */
- };
- /* unwrap an HCD pointer to get an EHCI_HCD pointer */
- #define hcd_to_ehci(hcd_ptr) list_entry(hcd_ptr, struct ehci_hcd, hcd)
- /* NOTE: urb->transfer_flags expected to not use this bit !!! */
- #define EHCI_STATE_UNLINK 0x8000 /* urb being unlinked */
- /*-------------------------------------------------------------------------*/
- /* 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 */
- /* dma same in urb's qtds, except 1st control qtd (setup buffer) */
- struct urb *urb; /* qtd's urb */
- dma_addr_t buf_dma; /* buffer address */
- size_t length; /* length of buffer */
- } __attribute__ ((aligned (32)));
- /*-------------------------------------------------------------------------*/
- /* 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 */
- 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 */
- atomic_t refcount;
- unsigned short usecs; /* intr bandwidth */
- short 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 */
- #ifdef EHCI_SOFT_RETRIES
- int retries;
- #endif
- } __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 */
- } __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)));
- #endif /* __LINUX_EHCI_HCD_H */