/* * __hc32 and __hc16 are "Host Controller" types, they may be equivalent to * __leXX (normally) or __beXX (given FOTG210_BIG_ENDIAN_DESC), depending on * the host controller implementation. * * To facilitate the strongest possible byte-order checking from "sparse" * and so on, we use __leXX unless that's not practical.
*/ #define __hc32 __le32 #define __hc16 __le16
/* statistics can be kept for tuning/monitoring */ struct fotg210_stats { /* irq usage */ unsignedlong normal; unsignedlong error; unsignedlong iaa; unsignedlong lost_iaa;
/* termination of urbs from core */ unsignedlong complete; unsignedlong unlink;
};
/* fotg210_hcd->lock guards shared data against other CPUs: * fotg210_hcd: async, unlink, periodic (and shadow), ... * usb_host_endpoint: hcpriv * fotg210_qh: qh_next, qtd_list * fotg210_qtd: qtd_list * * Also, hold this lock when talking to HC registers or * when updating hw_* fields in shared qh/qtd/... structures.
*/
#define FOTG210_MAX_ROOT_PORTS 1 /* see HCS_N_PORTS */
/* * fotg210_rh_state values of FOTG210_RH_RUNNING or above mean that the * controller may be doing DMA. Lower values mean there's no DMA.
*/ enum fotg210_rh_state {
FOTG210_RH_HALTED,
FOTG210_RH_SUSPENDED,
FOTG210_RH_RUNNING,
FOTG210_RH_STOPPING
};
/* * Timer events, ordered by increasing delay length. * Always update event_delays_ns[] and event_handlers[] (defined in * ehci-timer.c) in parallel with this list.
*/ enum fotg210_hrtimer_event {
FOTG210_HRTIMER_POLL_ASS, /* Poll for async schedule off */
FOTG210_HRTIMER_POLL_PSS, /* Poll for periodic schedule off */
FOTG210_HRTIMER_POLL_DEAD, /* Wait for dead controller to stop */
FOTG210_HRTIMER_UNLINK_INTR, /* Wait for interrupt QH unlink */
FOTG210_HRTIMER_FREE_ITDS, /* Wait for unused iTDs and siTDs */
FOTG210_HRTIMER_ASYNC_UNLINKS, /* Unlink empty async QHs */
FOTG210_HRTIMER_IAA_WATCHDOG, /* Handle lost IAA interrupts */
FOTG210_HRTIMER_DISABLE_PERIODIC, /* Wait to disable periodic sched */
FOTG210_HRTIMER_DISABLE_ASYNC, /* Wait to disable async sched */
FOTG210_HRTIMER_IO_WATCHDOG, /* Check for missing IRQs */
FOTG210_HRTIMER_NUM_EVENTS /* Must come last */
}; #define FOTG210_HRTIMER_NO_EVENT 99
struct fotg210_hcd { /* one per controller */ /* timing support */ enum fotg210_hrtimer_event next_hrtimer_event; unsigned enabled_hrtimer_events;
ktime_t hr_timeouts[FOTG210_HRTIMER_NUM_EVENTS]; struct hrtimer hrtimer;
int PSS_poll_count; int ASS_poll_count; int died_poll_count;
/* glue to PCI and HCD framework */ struct fotg210_caps __iomem *caps; struct fotg210_regs __iomem *regs; struct ehci_dbg_port __iomem *debug;
/* periodic schedule support */ #define DEFAULT_I_TDPS 1024 /* some HCs can do less */ unsigned periodic_size;
__hc32 *periodic; /* hw periodic table */
dma_addr_t periodic_dma; struct list_head intr_qh_list; unsigned i_thresh; /* uframes HC might cache */
union fotg210_shadow *pshadow; /* mirror hw periodic table */ struct fotg210_qh *intr_unlink; struct fotg210_qh *intr_unlink_last; unsigned intr_unlink_cycle; unsigned now_frame; /* frame from HC hardware */ unsigned next_frame; /* scan periodic, start here */ unsigned intr_count; /* intr activity count */ unsigned isoc_count; /* isoc activity count */ unsigned periodic_count; /* periodic activity count */ /* max periodic time per uframe */ unsigned uframe_periodic_max;
/* list of itds completed while now_frame was still active */ struct list_head cached_itd_list; struct fotg210_itd *last_itd_to_free;
/* per root hub port */ unsignedlong reset_done[FOTG210_MAX_ROOT_PORTS];
/* bit vectors (one bit per port) * which ports were already suspended at the start of a bus suspend
*/ unsignedlong bus_suspended;
/* which ports are edicated to the companion controller */ unsignedlong companion_ports;
/* which ports are owned by the companion during a bus suspend */ unsignedlong owned_ports;
/* which ports have the change-suspend feature turned on */ unsignedlong port_c_suspend;
/* which ports are suspended */ unsignedlong suspended_ports;
/* which ports have started to resume */ unsignedlong resuming_ports;
/* per-HC memory pools (could be per-bus, but ...) */ struct dma_pool *qh_pool; /* qh per active urb */ struct dma_pool *qtd_pool; /* one or more per qh */ struct dma_pool *itd_pool; /* itd per iso urb */
/* Section 2.2 Host Controller Capability Registers */ struct fotg210_caps { /* these fields are specified as 8 and 16 bit registers, * but some hosts can't perform 8 or 16 bit PCI accesses. * some hosts treat caplength and hciversion as parts of a 32-bit * register, others treat them as two separate registers, this * affects the memory map for big endian controllers.
*/
u32 hc_capbase; #define HC_LENGTH(fotg210, p) (0x00ff&((p) >> /* bits 7:0 / offset 00h */ \
(fotg210_big_endian_capbase(fotg210) ? 24 : 0))) #define HC_VERSION(fotg210, p) (0xffff&((p) >> /* bits 31:16 / offset 02h */ \
(fotg210_big_endian_capbase(fotg210) ? 0 : 16)))
u32 hcs_params; /* HCSPARAMS - offset 0x4 */ #define HCS_N_PORTS(p) (((p)>>0)&0xf) /* bits 3:0, ports on HC */
/* type tag from {qh,itd,fstn}->hw_next */ #define Q_NEXT_TYPE(fotg210, dma) ((dma) & cpu_to_hc32(fotg210, 3 << 1))
/* * Now the following defines are not converted using the * cpu_to_le32() macro anymore, since we have to support * "dynamic" switching between be and le support, so that the driver * can be used on one system with SoC EHCI controller using big-endian * descriptors as well as a normal little-endian PCI EHCI controller.
*/ /* values for that type tag */ #define Q_TYPE_ITD (0 << 1) #define Q_TYPE_QH (1 << 1) #define Q_TYPE_SITD (2 << 1) #define Q_TYPE_FSTN (3 << 1)
/* next async queue entry, or pointer to interrupt/periodic QH */ #define QH_NEXT(fotg210, dma) \
(cpu_to_hc32(fotg210, (((u32)dma)&~0x01f)|Q_TYPE_QH))
/* for periodic/async schedules and qtd lists, mark end of list */ #define FOTG210_LIST_END(fotg210) \
cpu_to_hc32(fotg210, 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 fotg210_shadow { struct fotg210_qh *qh; /* Q_TYPE_QH */ struct fotg210_itd *itd; /* Q_TYPE_ITD */ struct fotg210_fstn *fstn; /* Q_TYPE_FSTN */
__hc32 *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.
*/
/* first part defined by EHCI spec */ struct fotg210_qh_hw {
__hc32 hw_next; /* see EHCI 3.6.1 */
__hc32 hw_info1; /* see EHCI 3.6.2 */ #define QH_CONTROL_EP (1 << 27) /* FS/LS control endpoint */ #define QH_HEAD (1 << 15) /* Head of async reclamation list */ #define QH_TOGGLE_CTL (1 << 14) /* Data toggle control */ #define QH_HIGH_SPEED (2 << 12) /* Endpoint speed */ #define QH_LOW_SPEED (1 << 12) #define QH_FULL_SPEED (0 << 12) #define QH_INACTIVATE (1 << 7) /* Inactivate on next transaction */
__hc32 hw_info2; /* see EHCI 3.6.2 */ #define QH_SMASK 0x000000ff #define QH_CMASK 0x0000ff00 #define QH_HUBADDR 0x007f0000 #define QH_HUBPORT 0x3f800000 #define QH_MULT 0xc0000000
__hc32 hw_current; /* qtd list - see EHCI 3.6.4 */
/* qtd overlay (hardware parts of a struct fotg210_qtd) */
__hc32 hw_qtd_next;
__hc32 hw_alt_next;
__hc32 hw_token;
__hc32 hw_buf[5];
__hc32 hw_buf_hi[5];
} __aligned(32);
struct fotg210_qh { struct fotg210_qh_hw *hw; /* Must come first */ /* the rest is HCD-private */
dma_addr_t qh_dma; /* address of qh */ union fotg210_shadow qh_next; /* ptr to qh; or periodic */ struct list_head qtd_list; /* sw qtd list */ struct list_head intr_node; /* list of intr QHs */ struct fotg210_qtd *dummy; struct fotg210_qh *unlink_next; /* next on unlink list */
unsigned unlink_cycle;
u8 needs_rescan; /* Dequeue during giveback */
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 unlink q */ #define QH_STATE_COMPLETING 5 /* don't touch token.HALT */
/* description of one iso transaction (up to 3 KB data if highspeed) */ struct fotg210_iso_packet { /* These will be copied to iTD when scheduling */
u64 bufp; /* itd->hw_bufp{,_hi}[pg] |= */
__hc32 transaction; /* itd->hw_transaction[i] |= */
u8 cross; /* buf crosses pages */ /* for full speed OUT splits */
u32 buf1;
};
/* temporary schedule data for packets from iso urbs (both speeds) * each packet is one logical usb transaction to the device (not TT), * beginning at stream->next_uframe
*/ struct fotg210_iso_sched { struct list_head td_list; unsigned span; struct fotg210_iso_packet packet[];
};
/* * fotg210_iso_stream - groups all (s)itds for this endpoint. * acts like a qh would, if EHCI had them for ISO.
*/ struct fotg210_iso_stream { /* first field matches fotg210_hq, but is NULL */ struct fotg210_qh_hw *hw;
/* output of (re)scheduling */ int next_uframe;
__hc32 splits;
/* the rest is derived from the endpoint descriptor, * trusting urb->interval == f(epdesc->bInterval) and * including the extra info for hw_bufp[0..2]
*/
u8 usecs, c_usecs;
u16 interval;
u16 tt_usecs;
u16 maxp;
u16 raw_mask; unsigned bandwidth;
/* This is used to initialize iTD's hw_bufp fields */
__hc32 buf0;
__hc32 buf1;
__hc32 buf2;
/* this is used to initialize sITD's tt info */
__hc32 address;
};
__hc32 hw_bufp[7]; /* see EHCI 3.3.3 */
__hc32 hw_bufp_hi[7]; /* Appendix B */
/* the rest is HCD-private */
dma_addr_t itd_dma; /* for this itd */ union fotg210_shadow itd_next; /* ptr to periodic q entry */
struct urb *urb; struct fotg210_iso_stream *stream; /* endpoint's queue */ struct list_head itd_list; /* list of stream's itds */
/* any/all hw_transactions here may be used by that urb */ unsigned frame; /* where scheduled */ unsigned pg; unsigned index[8]; /* in urb->iso_frame_desc */
} __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 fotg210_fstn {
__hc32 hw_next; /* any periodic q entry */
__hc32 hw_prev; /* qh or FOTG210_LIST_END */
/* the rest is HCD-private */
dma_addr_t fstn_dma; union fotg210_shadow fstn_next; /* ptr to periodic q entry */
} __aligned(32);
/* * Some EHCI controllers have a Transaction Translator built into the * root hub. This is a non-standard feature. Each controller will need * to add code to the following inline functions, and call them as * needed (mostly in root hub code).
*/
/* Returns the speed of a device attached to a port on the root hub. */ staticinlineunsignedint
fotg210_port_speed(struct fotg210_hcd *fotg210, unsignedint portsc)
{ switch (fotg210_get_speed(fotg210, portsc)) { case 0: return 0; case 1: return USB_PORT_STAT_LOW_SPEED; case 2: default: return USB_PORT_STAT_HIGH_SPEED;
}
}
/* * While most USB host controllers implement their registers in * little-endian format, a minority (celleb companion chip) implement * them in big endian format. * * This attempts to support either format at compile time without a * runtime penalty, or both formats with the additional overhead * of checking a flag bit. *
*/
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