; Constants and structures that are shared between different parts of ; USB subsystem and *HCI drivers. ; ============================================================================= ; ================================= Constants ================================= ; ============================================================================= ; Version of all structures related to host controllers. ; Must be the same in kernel and *hci-drivers. USBHC_VERSION = 2 ; USB device must have at least 100ms of stable power before initializing can ; proceed; one timer tick is 10ms, so enforce delay in 10 ticks USB_CONNECT_DELAY = 10 ; USB requires at least 10 ms for reset signalling. Normally, this is one timer ; tick. However, it is possible that we start reset signalling in the end of ; interval between timer ticks and then we test time in the start of the next ; interval; in this case, the delta between [timer_ticks] is 1, but the real ; time passed is significantly less than 10 ms. To avoid this, we add an extra ; tick; this guarantees that at least 10 ms have passed. USB_RESET_TIME = 2 ; USB requires at least 10 ms of reset recovery, a delay between reset ; signalling and any commands to device. Add an extra tick for the same reasons ; as with the previous constant. USB_RESET_RECOVERY_TIME = 2 ; USB pipe types CONTROL_PIPE = 0 ISOCHRONOUS_PIPE = 1 BULK_PIPE = 2 INTERRUPT_PIPE = 3 ; Status codes for transfer callbacks. ; Taken from OHCI as most verbose controller in this sense. USB_STATUS_OK = 0 ; no error USB_STATUS_CRC = 1 ; CRC error USB_STATUS_BITSTUFF = 2 ; bit stuffing violation USB_STATUS_TOGGLE = 3 ; data toggle mismatch USB_STATUS_STALL = 4 ; device returned STALL USB_STATUS_NORESPONSE = 5 ; device not responding USB_STATUS_PIDCHECK = 6 ; invalid PID check bits USB_STATUS_WRONGPID = 7 ; unexpected PID value USB_STATUS_OVERRUN = 8 ; too many data from endpoint USB_STATUS_UNDERRUN = 9 ; too few data from endpoint USB_STATUS_BUFOVERRUN = 12 ; overflow of internal controller buffer USB_STATUS_BUFUNDERRUN = 13 ; underflow of internal controller buffer USB_STATUS_CLOSED = 16 ; pipe closed ; either explicitly with USBClosePipe ; or implicitly due to device disconnect USB_STATUS_CANCELLED = 17 ; transfer cancelled with USBAbortPipe ; Possible speeds of USB devices USB_SPEED_FS = 0 ; full-speed USB_SPEED_LS = 1 ; low-speed USB_SPEED_HS = 2 ; high-speed ; flags for usb_pipe.Flags USB_FLAG_CLOSED = 1 ; pipe is closed, no new transfers ; pipe is closed, return error instead of submitting any new transfer USB_FLAG_CAN_FREE = 2 ; pipe is closed via explicit call to USBClosePipe, so it can be freed without ; any driver notification; if this flag is not set, then the pipe is closed due ; to device disconnect, so it must remain valid until return from disconnect ; callback provided by the driver USB_FLAG_EXTRA_WAIT = 4 ; The pipe was in wait list, while another event occured; ; when the first wait will be done, reinsert the pipe to wait list USB_FLAG_DISABLED = 8 ; The pipe is temporarily disabled so that it is not visible to hardware ; but still remains in software list. Used for usb_abort_pipe. USB_FLAG_CLOSED_BIT = 0 ; USB_FLAG_CLOSED = 1 shl USB_FLAG_CLOSED_BIT ; ============================================================================= ; ================================ Structures ================================= ; ============================================================================= ; Description of controller-specific data and functions. struct usb_hardware_func Version dd ? ; must be USBHC_VERSION ID dd ? ; '*HCI' DataSize dd ? ; sizeof(*hci_controller) BeforeInit dd ? ; Early initialization: take ownership from BIOS. ; in: [ebp-4] = (bus shl 8) + devfn Init dd ? ; Initialize controller-specific part of controller data. ; in: eax -> *hci_controller to initialize, [ebp-4] = (bus shl 8) + devfn ; out: eax = 0 <=> failed, otherwise eax -> usb_controller ProcessDeferred dd ? ; Called regularly from the main loop of USB thread ; (either due to timeout from a previous call, or due to explicit wakeup). ; in: esi -> usb_controller ; out: eax = maximum timeout for next call (-1 = infinity) SetDeviceAddress dd ? ; in: esi -> usb_controller, ebx -> usb_pipe, cl = address GetDeviceAddress dd ? ; in: esi -> usb_controller, ebx -> usb_pipe ; out: eax = address PortDisable dd ? ; Disable the given port in the root hub. ; in: esi -> usb_controller, ecx = port (zero-based) InitiateReset dd ? ; Start reset signalling on the given port. ; in: esi -> usb_controller, ecx = port (zero-based) SetEndpointPacketSize dd ? ; in: esi -> usb_controller, ebx -> usb_pipe, ecx = packet size AllocPipe dd ? ; out: eax = pointer to allocated usb_pipe FreePipe dd ? ; void stdcall with one argument = pointer to previously allocated usb_pipe InitPipe dd ? ; in: edi -> usb_pipe for target, ecx -> usb_pipe for config pipe, ; esi -> usb_controller, eax -> usb_gtd for the first TD, ; [ebp+12] = endpoint, [ebp+16] = maxpacket, [ebp+20] = type UnlinkPipe dd ? ; esi -> usb_controller, ebx -> usb_pipe AllocTD dd ? ; out: eax = pointer to allocated usb_gtd FreeTD dd ? ; void stdcall with one argument = pointer to previously allocated usb_gtd AllocTransfer dd ? ; Allocate and initialize one stage of a transfer. ; ebx -> usb_pipe, other parameters are passed through the stack: ; buffer,size = data to transfer ; flags = same as in usb_open_pipe: ; bit 0 = allow short transfer, other bits reserved ; td = pointer to the current end-of-queue descriptor ; direction = ; 0000b for normal transfers, ; 1000b for control SETUP transfer, ; 1101b for control OUT transfer, ; 1110b for control IN transfer ; returns eax = pointer to the new end-of-queue descriptor ; (not included in the queue itself) or 0 on error InsertTransfer dd ? ; Activate previously initialized transfer (maybe with multiple stages). ; esi -> usb_controller, ebx -> usb_pipe, ; [esp+4] -> first usb_gtd for the transfer, ; ecx -> last descriptor for the transfer NewDevice dd ? ; Initiate configuration of a new device (create pseudo-pipe describing that ; device and call usb_new_device). ; esi -> usb_controller, eax = speed (one of USB_SPEED_* constants). DisablePipe dd ? ; This procedure temporarily removes the given pipe from hardware queue. ; esi -> usb_controller, ebx -> usb_pipe EnablePipe dd ? ; This procedure reinserts the given pipe to hardware queue ; after DisablePipe, with clearing transfer queue. ; esi -> usb_controller, ebx -> usb_pipe ; edx -> current descriptor, eax -> new last descriptor ends ; pointers to kernel API functions that are called from *HCI-drivers struct usbhc_func usb_process_gtd dd ? usb_init_static_endpoint dd ? usb_wakeup_if_needed dd ? usb_subscribe_control dd ? usb_subscription_done dd ? usb_allocate_common dd ? usb_free_common dd ? usb_td_to_virt dd ? usb_init_transfer dd ? usb_undo_tds dd ? usb_test_pending_port dd ? usb_get_tt dd ? usb_get_tt_think_time dd ? usb_new_device dd ? usb_disconnect_stage2 dd ? usb_process_wait_lists dd ? usb_unlink_td dd ? usb_is_final_packet dd ? usb_find_ehci_companion dd ? ends ; Controller descriptor. ; This structure represents the common (controller-independent) part ; of a controller for the USB code. The corresponding controller-dependent ; part *hci_controller is located immediately before usb_controller. struct usb_controller ; Two following fields organize all controllers in the global linked list. Next dd ? Prev dd ? HardwareFunc dd ? ; Pointer to usb_hardware_func structure with controller-specific functions. NumPorts dd ? ; Number of ports in the root hub. PCICoordinates dd ? ; Device:function and bus number from PCI. ; ; The hardware is allowed to cache some data from hardware structures. ; Regular operations are designed considering this, ; but sometimes it is required to wait for synchronization of hardware cache ; with modified structures in memory. ; The code keeps two queues of pipes waiting for synchronization, ; one for asynchronous (bulk/control) pipes, one for periodic pipes, hardware ; cache is invalidated under different conditions for those types. ; Both queues are organized in the same way, as single-linked lists. ; There are three special positions: the head of list (new pipes are added ; here), the first pipe to be synchronized at the current iteration, ; the tail of list (all pipes starting from here are synchronized). WaitPipeListAsync dd ? WaitPipeListPeriodic dd ? ; List heads. WaitPipeRequestAsync dd ? WaitPipeRequestPeriodic dd ? ; Pending request to hardware to refresh cache for items from WaitPipeList*. ; (Pointers to some items in WaitPipeList* or NULLs). ReadyPipeHeadAsync dd ? ReadyPipeHeadPeriodic dd ? ; Items of RemovingList* which were released by hardware and are ready ; for further processing. ; (Pointers to some items in WaitPipeList* or NULLs). NewConnected dd ? ; bit mask of recently connected ports of the root hub, ; bit set = a device was recently connected to the corresponding port; ; after USB_CONNECT_DELAY ticks of stable status these ports are moved to ; PendingPorts NewDisconnected dd ? ; bit mask of disconnected ports of the root hub, ; bit set = a device in the corresponding port was disconnected, ; disconnect processing is required. PendingPorts dd ? ; bit mask of ports which are ready to be initialized ControlLock MUTEX ? ; mutex which guards all operations with control queue BulkLock MUTEX ? ; mutex which guards all operations with bulk queue PeriodicLock MUTEX ? ; mutex which guards all operations with periodic queues WaitSpinlock: ; spinlock guarding WaitPipeRequest/ReadyPipeHead (but not WaitPipeList) StartWaitFrame dd ? ; USB frame number when WaitPipeRequest* was registered. ResettingHub dd ? ; Pointer to usb_hub responsible for the currently resetting port, if any. ; NULL for the root hub. ResettingPort db ? ; Port that is currently resetting, 0-based. ResettingSpeed db ? ; Speed of currently resetting device. ResettingStatus db ? ; Status of port reset. 0 = no port is resetting, -1 = reset failed, ; 1 = reset in progress, 2 = reset recovery in progress. rb 1 ; alignment ResetTime dd ? ; Time when reset signalling or reset recovery has been started. SetAddressBuffer rb 8 ; Buffer for USB control command SET_ADDRESS. ExistingAddresses rd 128/32 ; Bitmask for 128 bits; bit i is cleared <=> address i is free for allocating ; for new devices. Bit 0 is always set. ConnectedTime rd 16 ; Time, in timer ticks, when the port i has signalled the connect event. ; Valid only if bit i in NewConnected is set. DevicesByPort rd 16 ; Pointer to usb_pipe for zero endpoint (which serves as device handle) ; for each port. ends ; Pipe descriptor. ; * An USB pipe is described by two structures, for hardware and for software. ; * This is the software part. The hardware part is defined in a driver ; of the corresponding controller. ; * The hardware part is located immediately before usb_pipe, ; both are allocated at once by controller-specific code ; (it knows the total length, which depends on the hardware part). struct usb_pipe Controller dd ? ; Pointer to usb_controller structure corresponding to this pipe. ; Must be the first dword after hardware part, see *hci_new_device. ; ; Every endpoint is included into one of processing lists: ; * Bulk list contains all Bulk endpoints. ; * Control list contains all Control endpoints. ; * Several Periodic lists serve Interrupt endpoints with different interval. ; - There are N=2^n "leaf" periodic lists for N ms interval, one is processed ; in the frames 0,N,2N,..., another is processed in the frames ; 1,1+N,1+2N,... and so on. The hardware starts processing of periodic ; endpoints in every frame from the list identified by lower n bits of the ; frame number; the addresses of these N lists are written to the ; controller data area during the initialization. ; - We assume that n=5, N=32 to simplify the code and compact the data. ; OHCI works in this way. UHCI and EHCI actually have n=10, N=1024, ; but this is an overkill for interrupt endpoints; the large value of N is ; useful only for isochronous transfers in UHCI and EHCI. UHCI/EHCI code ; initializes "leaf" lists k,k+32,k+64,...,k+(1024-32) to the same value, ; giving essentially N=32. ; This restriction means that the actual maximum interval of polling any ; interrupt endpoint is 32ms, which seems to be a reasonable value. ; - Similarly, there are 16 lists for 16-ms interval, 8 lists for 8-ms ; interval and so on. Finally, there is one list for 1ms interval. Their ; addresses are not directly known to the controller. ; - The hardware serves endpoints following a physical link from the hardware ; part. ; - The hardware links are organized as follows. If the list item is not the ; last, it's hardware link points to the next item. The hardware link of ; the last item points to the first item of the "next" list. ; - The "next" list for k-th and (k+M)-th periodic lists for interval 2M ms ; is the k-th periodic list for interval M ms, M >= 1. In this scheme, ; if two "previous" lists are served in the frames k,k+2M,k+4M,... ; and k+M,k+3M,k+5M,... correspondingly, the "next" list is served in ; the frames k,k+M,k+2M,k+3M,k+4M,k+5M,..., which is exactly what we want. ; - The links between Periodic, Control, Bulk lists and the processing of ; Isochronous endpoints are controller-specific. ; * The head of every processing list is a static entry which does not ; correspond to any real pipe. It is described by usb_static_ep ; structure, not usb_pipe. For OHCI and UHCI, sizeof.usb_static_ep plus ; sizeof hardware part is 20h, the total number of lists is ; 32+16+8+4+2+1+1+1 = 65, so all these structures fit in one page, ; leaving space for other data. This is another reason for 32ms limit. ; * Static endpoint descriptors are kept in *hci_controller structure. ; * All items in every processing list, including the static head, are ; organized in a double-linked list using .NextVirt and .PrevVirt fields. ; * [[item.NextVirt].PrevVirt] = [[item.PrevVirt].NextVirt] for all items. NextVirt dd ? ; Next endpoint in the processing list. ; See also PrevVirt field and the description before NextVirt field. PrevVirt dd ? ; Previous endpoint in the processing list. ; See also NextVirt field and the description before NextVirt field. BaseList dd ? ; Pointer to head of the processing list. ; ; Every pipe has the associated transfer queue, that is, the double-linked ; list of Transfer Descriptors aka TD. For Control, Bulk and Interrupt ; endpoints this list consists of usb_gtd structures ; (GTD = General Transfer Descriptors), for Isochronous endpoints ; this list consists of usb_itd structures, which are not developed yet. ; The pipe needs to know only the last TD; the first TD can be ; obtained as [[pipe.LastTD].NextVirt]. LastTD dd ? ; Last TD in the transfer queue. ; ; All opened pipes corresponding to the same physical device are organized in ; the double-linked list using .NextSibling and .PrevSibling fields. ; The head of this list is kept in usb_device_data structure (OpenedPipeList). ; This list is used when the device is disconnected and all pipes for the ; device should be closed. ; Also, all pipes closed due to disconnect must remain valid at least until ; driver-provided disconnect function returns; all should-be-freed-but-not-now ; pipes for one device are organized in another double-linked list with ; the head in usb_device_data.ClosedPipeList; this list uses the same link ; fields, one pipe can never be in both lists. NextSibling dd ? ; Next pipe for the physical device. PrevSibling dd ? ; Previous pipe for the physical device. ; ; When hardware part of pipe is changed, some time is needed before further ; actions so that hardware reacts on this change. During that time, ; all changed pipes are organized in single-linked list with the head ; usb_controller.WaitPipeList* and link field NextWait. ; Currently there are two possible reasons to change: ; change of address/packet size in initial configuration, ; close of the pipe. They are distinguished by USB_FLAG_CLOSED. NextWait dd ? Lock MUTEX ; Mutex that guards operations with transfer queue for this pipe. Type db ? ; Type of pipe, one of {CONTROL,ISOCHRONOUS,BULK,INTERRUPT}_PIPE. Flags db ? ; Combination of flags, USB_FLAG_*. rb 2 ; dword alignment DeviceData dd ? ; Pointer to usb_device_data, common for all pipes for one device. ends ; This structure describes the static head of every list of pipes. struct usb_static_ep ; software fields Bandwidth dd ? ; valid only for interrupt/isochronous USB1 lists ; The offsets of the following two fields must be the same in this structure ; and in usb_pipe. NextVirt dd ? PrevVirt dd ? ends ; This structure represents one transfer descriptor ; ('g' stands for "general" as opposed to isochronous usb_itd). ; Note that one transfer can have several descriptors: ; a control transfer has three stages. ; Additionally, every controller has a limit on transfer length with ; one descriptor (packet size for UHCI, 1K for OHCI, 4K for EHCI), ; large transfers must be split into individual packets according to that limit. struct usb_gtd Callback dd ? ; Zero for intermediate descriptors, pointer to callback function ; for final descriptor. See the docs for description of the callback. UserData dd ? ; Dword which is passed to Callback as is, not used by USB code itself. ; Two following fields organize all descriptors for one pipe in ; the linked list. NextVirt dd ? PrevVirt dd ? Pipe dd ? ; Pointer to the parent usb_pipe. Buffer dd ? ; Pointer to data for this descriptor. Length dd ? ; Length of data for this descriptor. ends ; Interface-specific data. Several interfaces of one device can operate ; independently, each is controlled by some driver and is identified by ; some driver-specific data passed as is to the driver. struct usb_interface_data DriverData dd ? ; Passed as is to the driver. DriverFunc dd ? ; Pointer to USBSRV structure for the driver. ends ; Device-specific data. struct usb_device_data PipeListLock MUTEX ; Lock guarding OpenedPipeList. Must be the first item of the structure, ; the code passes pointer to usb_device_data as is to mutex_lock/unlock. OpenedPipeList rd 2 ; List of all opened pipes for the device. ; Used when the device is disconnected, so all pipes should be closed. ClosedPipeList rd 2 ; List of all closed, but still valid pipes for the device. ; A pipe closed with USBClosePipe is just deallocated, ; but a pipe closed due to disconnect must remain valid until driver-provided ; disconnect handler returns; this list links all such pipes to deallocate them ; after disconnect processing. NumPipes dd ? ; Number of not-yet-closed pipes. Hub dd ? ; NULL if connected to the root hub, pointer to usb_hub otherwise. TTHub dd ? ; Pointer to usb_hub for (the) hub with Transaction Translator for the device, ; NULL if the device operates in the same speed as the controller. Port db ? ; Port on the hub, zero-based. TTPort db ? ; Port on the TTHub, zero-based. DeviceDescrSize db ? ; Size of device descriptor. Speed db ? ; Device speed, one of USB_SPEED_*. Timer dd ? ; Handle of timer that handles request timeout. NumInterfaces dd ? ; Number of interfaces. ConfigDataSize dd ? ; Total size of data associated with the configuration descriptor ; (including the configuration descriptor itself). Interfaces dd ? ; Offset from the beginning of this structure to Interfaces field. ; Variable-length fields: ; DeviceDescriptor: ; device descriptor starts here ; ConfigDescriptor = DeviceDescriptor + DeviceDescrSize ; configuration descriptor with all associated data ; Interfaces = ALIGN_UP(ConfigDescriptor + ConfigDataSize, 4) ; array of NumInterfaces elements of type usb_interface_data ends usb_device_data.DeviceDescriptor = sizeof.usb_device_data