/* * 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 */ /* * __hc32 and __hc16 are "Host Controller" types, they may be equivalent to * __leXX (normally) or __beXX (given EHCI_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. */ #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC typedef __u32 __bitwise __hc32; typedef __u16 __bitwise __hc16; #else #define __hc32 __le32 #define __hc16 __le16 #endif /* 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 scanning : 1; /* 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; 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 */ /* list of itds completed while clock_frame was still active */ struct list_head cached_itd_list; unsigned clock_frame; /* per root hub port */ unsigned long reset_done [EHCI_MAX_ROOT_PORTS]; /* bit vectors (one bit per port) */ unsigned long bus_suspended; /* which ports were already suspended at the start of a bus suspend */ unsigned long companion_ports; /* which ports are dedicated to the companion controller */ unsigned long owned_ports; /* which ports are owned by the companion during a bus suspend */ unsigned long port_c_suspend; /* which ports have the change-suspend feature turned on */ unsigned long suspended_ports; /* which ports are 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 iaa_watchdog; struct timer_list watchdog; unsigned long actions; unsigned stamp; unsigned long next_statechange; u32 command; /* SILICON QUIRKS */ unsigned no_selective_suspend:1; unsigned has_fsl_port_bug:1; /* FreeScale */ unsigned big_endian_mmio:1; unsigned big_endian_desc:1; unsigned has_amcc_usb23:1; /* required for usb32 quirk */ #define OHCI_CTRL_HCFS (3 << 6) #define OHCI_USB_OPER (2 << 6) #define OHCI_USB_SUSPEND (3 << 6) #define OHCI_HCCTRL_OFFSET 0x4 #define OHCI_HCCTRL_LEN 0x4 __hc32 *ohci_hcctrl_reg; 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 /* debug files */ #ifdef DEBUG struct dentry *debug_dir; struct dentry *debug_async; struct dentry *debug_periodic; struct dentry *debug_registers; #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); } static inline void iaa_watchdog_start(struct ehci_hcd *ehci) { WARN_ON(timer_pending(&ehci->iaa_watchdog)); mod_timer(&ehci->iaa_watchdog, jiffies + msecs_to_jiffies(EHCI_IAA_MSECS)); } static inline void iaa_watchdog_done(struct ehci_hcd *ehci) { del_timer(&ehci->iaa_watchdog); } enum ehci_timer_action { TIMER_IO_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) { /* Don't override timeouts which shrink or (later) disable * the async ring; just the I/O watchdog. Note that if a * SHRINK were pending, OFF would never be requested. */ if (timer_pending(&ehci->watchdog) && ((BIT(TIMER_ASYNC_SHRINK) | BIT(TIMER_ASYNC_OFF)) & ehci->actions)) return; if (!test_and_set_bit (action, &ehci->actions)) { unsigned long t; switch (action) { case TIMER_IO_WATCHDOG: t = EHCI_IO_JIFFIES; break; case TIMER_ASYNC_OFF: t = EHCI_ASYNC_JIFFIES; break; // case TIMER_ASYNC_SHRINK: default: /* add a jiffie since we synch against the * 8 KHz uframe counter. */ t = DIV_ROUND_UP(EHCI_SHRINK_FRAMES * HZ, 1000) + 1; break; } mod_timer(&ehci->watchdog, t + jiffies); } } static void free_cached_itd_list(struct ehci_hcd *ehci); /*-------------------------------------------------------------------------*/ #include /*-------------------------------------------------------------------------*/ #define QTD_NEXT(ehci, dma) cpu_to_hc32(ehci, (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 */ __hc32 hw_next; /* see EHCI 3.5.1 */ __hc32 hw_alt_next; /* see EHCI 3.5.2 */ __hc32 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? */ #define ACTIVE_BIT(ehci) cpu_to_hc32(ehci, QTD_STS_ACTIVE) #define HALT_BIT(ehci) cpu_to_hc32(ehci, QTD_STS_HALT) #define STATUS_BIT(ehci) cpu_to_hc32(ehci, QTD_STS_STS) __hc32 hw_buf [5]; /* see EHCI 3.5.4 */ __hc32 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(ehci) cpu_to_hc32 (ehci, ~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(ehci,dma) ((dma) & cpu_to_hc32(ehci, 3 << 1)) /* * Now the following defines are not converted using the * __constant_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(ehci,dma) (cpu_to_hc32(ehci, (((u32)dma)&~0x01f)|Q_TYPE_QH)) /* for periodic/async schedules and qtd lists, mark end of list */ #define EHCI_LIST_END(ehci) cpu_to_hc32(ehci, 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 */ __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. */ struct ehci_qh { /* first part defined by EHCI spec */ __hc32 hw_next; /* see EHCI 3.6.1 */ __hc32 hw_info1; /* see EHCI 3.6.2 */ #define QH_HEAD 0x00008000 __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 ehci_qtd) */ __hc32 hw_qtd_next; __hc32 hw_alt_next; __hc32 hw_token; __hc32 hw_buf [5]; __hc32 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; /* * Do NOT use atomic operations for QH refcounting. On some CPUs * (PPC7448 for example), atomic operations cannot be performed on * memory that is cache-inhibited (i.e. being used for DMA). * Spinlocks are used to protect all QH fields. */ u32 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 */ 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] |= */ __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 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 */ __hc32 hw_next; __hc32 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; __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; }; /*-------------------------------------------------------------------------*/ /* * 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 */ __hc32 hw_next; /* see EHCI 3.3.1 */ __hc32 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(ehci) cpu_to_hc32(ehci, EHCI_ISOC_ACTIVE) __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 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 */ } __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 */ __hc32 hw_next; /* uses bit field macros above - see EHCI 0.95 Table 3-8 */ __hc32 hw_fullspeed_ep; /* EHCI table 3-9 */ __hc32 hw_uframe; /* EHCI table 3-10 */ __hc32 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(ehci) cpu_to_hc32(ehci, SITD_STS_ACTIVE) __hc32 hw_buf [2]; /* EHCI table 3-12 */ __hc32 hw_backpointer; /* EHCI table 3-13 */ __hc32 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 { __hc32 hw_next; /* any periodic q entry */ __hc32 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) (ehci_to_hcd(e)->has_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 /* * Big-endian read/write functions are arch-specific. * Other arches can be added if/when they're needed. */ #if defined(CONFIG_ARM) && defined(CONFIG_ARCH_IXP4XX) #define readl_be(addr) __raw_readl((__force unsigned *)addr) #define writel_be(val, addr) __raw_writel(val, (__force unsigned *)addr) #endif static inline unsigned int ehci_readl(const struct ehci_hcd *ehci, __u32 __iomem * regs) { #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO return ehci_big_endian_mmio(ehci) ? readl_be(regs) : readl(regs); #else return readl(regs); #endif } static inline void ehci_writel(const struct ehci_hcd *ehci, const unsigned int val, __u32 __iomem *regs) { #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO ehci_big_endian_mmio(ehci) ? writel_be(val, regs) : writel(val, regs); #else writel(val, regs); #endif } /* * On certain ppc-44x SoC there is a HW issue, that could only worked around with * explicit suspend/operate of OHCI. This function hereby makes sense only on that arch. * Other common bits are dependant on has_amcc_usb23 quirk flag. */ #ifdef CONFIG_44x static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational) { u32 hc_control; hc_control = (readl_be(ehci->ohci_hcctrl_reg) & ~OHCI_CTRL_HCFS); if (operational) hc_control |= OHCI_USB_OPER; else hc_control |= OHCI_USB_SUSPEND; writel_be(hc_control, ehci->ohci_hcctrl_reg); (void) readl_be(ehci->ohci_hcctrl_reg); } #else static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational) { } #endif /*-------------------------------------------------------------------------*/ /* * The AMCC 440EPx not only implements its EHCI registers in big-endian * format, but also its DMA data structures (descriptors). * * EHCI controllers accessed through PCI work normally (little-endian * everywhere), so we won't bother supporting a BE-only mode for now. */ #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC #define ehci_big_endian_desc(e) ((e)->big_endian_desc) /* cpu to ehci */ static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x) { return ehci_big_endian_desc(ehci) ? (__force __hc32)cpu_to_be32(x) : (__force __hc32)cpu_to_le32(x); } /* ehci to cpu */ static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x) { return ehci_big_endian_desc(ehci) ? be32_to_cpu((__force __be32)x) : le32_to_cpu((__force __le32)x); } static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x) { return ehci_big_endian_desc(ehci) ? be32_to_cpup((__force __be32 *)x) : le32_to_cpup((__force __le32 *)x); } #else /* cpu to ehci */ static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x) { return cpu_to_le32(x); } /* ehci to cpu */ static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x) { return le32_to_cpu(x); } static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x) { return le32_to_cpup(x); } #endif /*-------------------------------------------------------------------------*/ #ifndef DEBUG #define STUB_DEBUG_FILES #endif /* DEBUG */ /*-------------------------------------------------------------------------*/ #endif /* __LINUX_EHCI_HCD_H */