/* * 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), ... * usb_host_endpoint: hcpriv * 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 */ /* glue to PCI and HCD framework */ struct ehci_caps __iomem *caps; struct ehci_regs __iomem *regs; struct ehci_dbg_port __iomem *debug; __u32 hcs_params; /* cached register copy */ spinlock_t lock; /* async schedule support */ struct ehci_qh *async; struct ehci_qh *reclaim; unsigned reclaim_ready : 1; unsigned scanning : 1; /* periodic schedule support */ #define DEFAULT_I_TDPS 1024 /* some HCs can do less */ unsigned periodic_size; __le32 *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]; unsigned long bus_suspended; /* 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 */ struct dma_pool *sitd_pool; /* sitd per split iso urb */ struct timer_list watchdog; unsigned long actions; unsigned stamp; unsigned long next_statechange; u32 command; /* SILICON QUIRKS */ unsigned is_tdi_rh_tt:1; /* TDI roothub with TT */ unsigned no_selective_suspend:1; unsigned has_fsl_port_bug:1; /* FreeScale */ unsigned big_endian_mmio:1; u8 sbrn; /* packed release number */ /* irq statistics */ #ifdef EHCI_STATS struct ehci_stats stats; # define COUNT(x) do { (x)++; } while (0) #else # define COUNT(x) do {} while (0) #endif }; /* convert between an HCD pointer and the corresponding EHCI_HCD */ static inline struct ehci_hcd *hcd_to_ehci (struct usb_hcd *hcd) { return (struct ehci_hcd *) (hcd->hcd_priv); } static inline struct usb_hcd *ehci_to_hcd (struct ehci_hcd *ehci) { return container_of ((void *) ehci, struct usb_hcd, hcd_priv); } 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 += jiffies; // 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 { /* these fields are specified as 8 and 16 bit registers, * but some hosts can't perform 8 or 16 bit PCI accesses. */ u32 hc_capbase; #define HC_LENGTH(p) (((p)>>00)&0x00ff) /* bits 7:0 */ #define HC_VERSION(p) (((p)>>16)&0xffff) /* bits 31:16 */ 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 */ /* ASYNCLISTADDR: 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 */ #define PORT_LED_OFF (0<<14) #define PORT_LED_AMBER (1<<14) #define PORT_LED_GREEN (2<<14) #define PORT_LED_MASK (3<<14) #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 */ #define PORT_RWC_BITS (PORT_CSC | PORT_PEC | PORT_OCC) } __attribute__ ((packed)); /* Appendix C, Debug port ... intended for use with special "debug devices" * that can help if there's no serial console. (nonstandard enumeration.) */ struct ehci_dbg_port { u32 control; #define DBGP_OWNER (1<<30) #define DBGP_ENABLED (1<<28) #define DBGP_DONE (1<<16) #define DBGP_INUSE (1<<10) #define DBGP_ERRCODE(x) (((x)>>7)&0x07) # define DBGP_ERR_BAD 1 # define DBGP_ERR_SIGNAL 2 #define DBGP_ERROR (1<<6) #define DBGP_GO (1<<5) #define DBGP_OUT (1<<4) #define DBGP_LEN(x) (((x)>>0)&0x0f) u32 pids; #define DBGP_PID_GET(x) (((x)>>16)&0xff) #define DBGP_PID_SET(data,tok) (((data)<<8)|(tok)) u32 data03; u32 data47; u32 address; #define DBGP_EPADDR(dev,ep) (((dev)<<8)|(ep)) } __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 */ __le32 hw_next; /* see EHCI 3.5.1 */ __le32 hw_alt_next; /* see EHCI 3.5.2 */ __le32 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? */ __le32 hw_buf [5]; /* see EHCI 3.5.4 */ __le32 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 */ __le32 *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 */ __le32 hw_next; /* see EHCI 3.6.1 */ __le32 hw_info1; /* see EHCI 3.6.2 */ #define QH_HEAD 0x00008000 __le32 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 __le32 hw_current; /* qtd list - see EHCI 3.6.4 */ /* qtd overlay (hardware parts of a struct ehci_qtd) */ __le32 hw_qtd_next; __le32 hw_alt_next; __le32 hw_token; __le32 hw_buf [5]; __le32 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 */ struct ehci_hcd *ehci; struct kref kref; 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 */ u16 tt_usecs; /* tt downstream bandwidth */ unsigned short period; /* polling interval */ unsigned short start; /* where polling starts */ #define NO_FRAME ((unsigned short)~0) /* pick new start */ struct usb_device *dev; /* access to TT */ } __attribute__ ((aligned (32))); /*-------------------------------------------------------------------------*/ /* description of one iso transaction (up to 3 KB data if highspeed) */ struct ehci_iso_packet { /* These will be copied to iTD when scheduling */ u64 bufp; /* itd->hw_bufp{,_hi}[pg] |= */ __le32 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 ehci_iso_sched { struct list_head td_list; unsigned span; struct ehci_iso_packet packet [0]; }; /* * ehci_iso_stream - groups all (s)itds for this endpoint. * acts like a qh would, if EHCI had them for ISO. */ struct ehci_iso_stream { /* first two fields match QH, but info1 == 0 */ __le32 hw_next; __le32 hw_info1; u32 refcount; u8 bEndpointAddress; u8 highspeed; u16 depth; /* depth in uframes */ struct list_head td_list; /* queued itds/sitds */ struct list_head free_list; /* list of unused itds/sitds */ struct usb_device *udev; struct usb_host_endpoint *ep; /* output of (re)scheduling */ unsigned long start; /* jiffies */ unsigned long rescheduled; int next_uframe; __le32 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 interval; u8 usecs, c_usecs; u16 tt_usecs; u16 maxp; u16 raw_mask; unsigned bandwidth; /* This is used to initialize iTD's hw_bufp fields */ __le32 buf0; __le32 buf1; __le32 buf2; /* this is used to initialize sITD's tt info */ __le32 address; }; /*-------------------------------------------------------------------------*/ /* * 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 */ __le32 hw_next; /* see EHCI 3.3.1 */ __le32 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) & 0x0fff) #define EHCI_ITD_IOC (1 << 15) /* interrupt on complete */ #define ITD_ACTIVE __constant_cpu_to_le32(EHCI_ISOC_ACTIVE) __le32 hw_bufp [7]; /* see EHCI 3.3.3 */ __le32 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 ehci_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 */ u8 usecs[8]; } __attribute__ ((aligned (32))); /*-------------------------------------------------------------------------*/ /* * EHCI Specification 0.95 Section 3.4 * siTD, aka split-transaction isochronous Transfer Descriptor * ... describe 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 */ __le32 hw_next; /* uses bit field macros above - see EHCI 0.95 Table 3-8 */ __le32 hw_fullspeed_ep; /* EHCI table 3-9 */ __le32 hw_uframe; /* EHCI table 3-10 */ __le32 hw_results; /* EHCI table 3-11 */ #define SITD_IOC (1 << 31) /* interrupt on completion */ #define SITD_PAGE (1 << 30) /* buffer 0/1 */ #define SITD_LENGTH(x) (0x3ff & ((x)>>16)) #define SITD_STS_ACTIVE (1 << 7) /* HC may execute this */ #define SITD_STS_ERR (1 << 6) /* error from TT */ #define SITD_STS_DBE (1 << 5) /* data buffer error (in HC) */ #define SITD_STS_BABBLE (1 << 4) /* device was babbling */ #define SITD_STS_XACT (1 << 3) /* illegal IN response */ #define SITD_STS_MMF (1 << 2) /* incomplete split transaction */ #define SITD_STS_STS (1 << 1) /* split transaction state */ #define SITD_ACTIVE __constant_cpu_to_le32(SITD_STS_ACTIVE) __le32 hw_buf [2]; /* EHCI table 3-12 */ __le32 hw_backpointer; /* EHCI table 3-13 */ __le32 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; struct ehci_iso_stream *stream; /* endpoint's queue */ struct list_head sitd_list; /* list of stream's sitds */ unsigned frame; unsigned index; } __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 { __le32 hw_next; /* any periodic q entry */ __le32 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))); /*-------------------------------------------------------------------------*/ #ifdef CONFIG_USB_EHCI_ROOT_HUB_TT /* * 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). */ #define ehci_is_TDI(e) ((e)->is_tdi_rh_tt) /* Returns the speed of a device attached to a port on the root hub. */ static inline unsigned int ehci_port_speed(struct ehci_hcd *ehci, unsigned int portsc) { if (ehci_is_TDI(ehci)) { switch ((portsc>>26)&3) { case 0: return 0; case 1: return (1<has_fsl_port_bug) #else #define ehci_has_fsl_portno_bug(e) (0) #endif /* * 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. */ #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO #define ehci_big_endian_mmio(e) ((e)->big_endian_mmio) #else #define ehci_big_endian_mmio(e) 0 #endif static inline unsigned int ehci_readl (const struct ehci_hcd *ehci, __u32 __iomem * regs) { return ehci_big_endian_mmio(ehci) ? readl_be((__force u32 *)regs) : readl((__force u32 *)regs); } static inline void ehci_writel (const struct ehci_hcd *ehci, const unsigned int val, __u32 __iomem *regs) { ehci_big_endian_mmio(ehci) ? writel_be(val, (__force u32 *)regs) : writel(val, (__force u32 *)regs); } /*-------------------------------------------------------------------------*/ #ifndef DEBUG #define STUB_DEBUG_FILES #endif /* DEBUG */ /*-------------------------------------------------------------------------*/ #endif /* __LINUX_EHCI_HCD_H */