472 lines
19 KiB
PHP
472 lines
19 KiB
PHP
; USB Host Controller support code: hardware-independent part,
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; common for all controller types.
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; =============================================================================
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; ================================= Constants =================================
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; =============================================================================
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; USB device must have at least 100ms of stable power before initializing can
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; proceed; one timer tick is 10ms, so enforce delay in 10 ticks
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USB_CONNECT_DELAY = 10
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; USB requires at least 10 ms for reset signalling. Normally, this is one timer
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; tick. However, it is possible that we start reset signalling in the end of
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; interval between timer ticks and then we test time in the start of the next
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; interval; in this case, the delta between [timer_ticks] is 1, but the real
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; time passed is significantly less than 10 ms. To avoid this, we add an extra
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; tick; this guarantees that at least 10 ms have passed.
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USB_RESET_TIME = 2
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; USB requires at least 10 ms of reset recovery, a delay between reset
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; signalling and any commands to device. Add an extra tick for the same reasons
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; as with the previous constant.
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USB_RESET_RECOVERY_TIME = 2
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; =============================================================================
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; ================================ Structures =================================
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; =============================================================================
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; Controller descriptor.
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; This structure represents the common (controller-independent) part
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; of a controller for the USB code. The corresponding controller-dependent
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; part *hci_controller is located immediately before usb_controller.
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struct usb_controller
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; Two following fields organize all controllers in the global linked list.
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Next dd ?
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Prev dd ?
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HardwareFunc dd ?
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; Pointer to usb_hardware_func structure with controller-specific functions.
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NumPorts dd ?
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; Number of ports in the root hub.
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SetAddressBuffer rb 8
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; Buffer for USB control command SET_ADDRESS.
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ExistingAddresses rd 128/32
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; Bitmask for 128 bits; bit i is cleared <=> address i is free for allocating
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; for new devices. Bit 0 is always set.
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;
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; The hardware is allowed to cache some data from hardware structures.
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; Regular operations are designed considering this,
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; but sometimes it is required to wait for synchronization of hardware cache
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; with modified structures in memory.
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; The code keeps two queues of pipes waiting for synchronization,
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; one for asynchronous (bulk/control) pipes, one for periodic pipes, hardware
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; cache is invalidated under different conditions for those types.
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; Both queues are organized in the same way, as single-linked lists.
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; There are three special positions: the head of list (new pipes are added
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; here), the first pipe to be synchronized at the current iteration,
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; the tail of list (all pipes starting from here are synchronized).
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WaitPipeListAsync dd ?
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WaitPipeListPeriodic dd ?
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; List heads.
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WaitPipeRequestAsync dd ?
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WaitPipeRequestPeriodic dd ?
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; Pending request to hardware to refresh cache for items from WaitPipeList*.
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; (Pointers to some items in WaitPipeList* or NULLs).
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ReadyPipeHeadAsync dd ?
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ReadyPipeHeadPeriodic dd ?
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; Items of RemovingList* which were released by hardware and are ready
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; for further processing.
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; (Pointers to some items in WaitPipeList* or NULLs).
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NewConnected dd ?
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; bit mask of recently connected ports of the root hub,
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; bit set = a device was recently connected to the corresponding port;
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; after USB_CONNECT_DELAY ticks of stable status these ports are moved to
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; PendingPorts
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NewDisconnected dd ?
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; bit mask of disconnected ports of the root hub,
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; bit set = a device in the corresponding port was disconnected,
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; disconnect processing is required.
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PendingPorts dd ?
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; bit mask of ports which are ready to be initialized
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ControlLock MUTEX ?
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; mutex which guards all operations with control queue
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BulkLock MUTEX ?
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; mutex which guards all operations with bulk queue
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PeriodicLock MUTEX ?
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; mutex which guards all operations with periodic queues
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WaitSpinlock:
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; spinlock guarding WaitPipeRequest/ReadyPipeHead (but not WaitPipeList)
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StartWaitFrame dd ?
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; USB frame number when WaitPipeRequest* was registered.
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ResettingHub dd ?
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; Pointer to usb_hub responsible for the currently resetting port, if any.
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; NULL for the root hub.
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ResettingPort db ?
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; Port that is currently resetting, 0-based.
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ResettingSpeed db ?
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; Speed of currently resetting device.
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ResettingStatus db ?
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; Status of port reset. 0 = no port is resetting, -1 = reset failed,
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; 1 = reset in progress, 2 = reset recovery in progress.
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rb 1 ; alignment
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ResetTime dd ?
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; Time when reset signalling or reset recovery has been started.
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ConnectedTime rd 16
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; Time, in timer ticks, when the port i has signalled the connect event.
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; Valid only if bit i in NewConnected is set.
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DevicesByPort rd 16
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; Pointer to usb_pipe for zero endpoint (which serves as device handle)
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; for each port.
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ends
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; Interface-specific data. Several interfaces of one device can operate
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; independently, each is controlled by some driver and is identified by
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; some driver-specific data passed as is to the driver.
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struct usb_interface_data
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DriverData dd ?
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; Passed as is to the driver.
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DriverFunc dd ?
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; Pointer to USBSRV structure for the driver.
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ends
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; Device-specific data.
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struct usb_device_data
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PipeListLock MUTEX
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; Lock guarding OpenedPipeList. Must be the first item of the structure,
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; the code passes pointer to usb_device_data as is to mutex_lock/unlock.
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OpenedPipeList rd 2
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; List of all opened pipes for the device.
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; Used when the device is disconnected, so all pipes should be closed.
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ClosedPipeList rd 2
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; List of all closed, but still valid pipes for the device.
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; A pipe closed with USBClosePipe is just deallocated,
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; but a pipe closed due to disconnect must remain valid until driver-provided
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; disconnect handler returns; this list links all such pipes to deallocate them
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; after disconnect processing.
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NumPipes dd ?
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; Number of not-yet-closed pipes.
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Hub dd ?
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; NULL if connected to the root hub, pointer to usb_hub otherwise.
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Port db ?
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; Port on the hub, zero-based.
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DeviceDescrSize db ?
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; Size of device descriptor.
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NumInterfaces db ?
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; Number of interfaces.
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Speed db ?
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; Device speed, one of USB_SPEED_*.
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ConfigDataSize dd ?
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; Total size of data associated with the configuration descriptor
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; (including the configuration descriptor itself);
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Interfaces dd ?
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; Offset from the beginning of this structure to Interfaces field.
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; Variable-length fields:
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; DeviceDescriptor:
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; device descriptor starts here
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; ConfigDescriptor = DeviceDescriptor + DeviceDescrSize
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; configuration descriptor with all associated data
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; Interfaces = ALIGN_UP(ConfigDescriptor + ConfigDataSize, 4)
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; array of NumInterfaces elements of type usb_interface_data
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ends
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usb_device_data.DeviceDescriptor = sizeof.usb_device_data
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; Description of controller-specific data and functions.
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struct usb_hardware_func
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ID dd ? ; '*HCI'
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DataSize dd ? ; sizeof(*hci_controller)
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Init dd ?
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; Initialize controller-specific part of controller data.
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; in: eax -> *hci_controller to initialize, [ebp-4] = (bus shl 8) + devfn
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; out: eax = 0 <=> failed, otherwise eax -> usb_controller
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ProcessDeferred dd ?
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; Called regularly from the main loop of USB thread
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; (either due to timeout from a previous call, or due to explicit wakeup).
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; in: esi -> usb_controller
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; out: eax = maximum timeout for next call (-1 = infinity)
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SetDeviceAddress dd ?
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; in: esi -> usb_controller, ebx -> usb_pipe, cl = address
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GetDeviceAddress dd ?
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; in: esi -> usb_controller, ebx -> usb_pipe
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; out: eax = address
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PortDisable dd ?
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; Disable the given port in the root hub.
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; in: esi -> usb_controller, ecx = port (zero-based)
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InitiateReset dd ?
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; Start reset signalling on the given port.
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; in: esi -> usb_controller, ecx = port (zero-based)
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SetEndpointPacketSize dd ?
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; in: esi -> usb_controller, ebx -> usb_pipe, ecx = packet size
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AllocPipe dd ?
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; out: eax = pointer to allocated usb_pipe
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FreePipe dd ?
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; void stdcall with one argument = pointer to previously allocated usb_pipe
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InitPipe dd ?
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; in: edi -> usb_pipe for target, ecx -> usb_pipe for config pipe,
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; esi -> usb_controller, eax -> usb_gtd for the first TD,
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; [ebp+12] = endpoint, [ebp+16] = maxpacket, [ebp+20] = type
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UnlinkPipe dd ?
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; esi -> usb_controller, ebx -> usb_pipe
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AllocTD dd ?
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; out: eax = pointer to allocated usb_gtd
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FreeTD dd ?
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; void stdcall with one argument = pointer to previously allocated usb_gtd
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AllocTransfer dd ?
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; Allocate and initialize one stage of a transfer.
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; ebx -> usb_pipe, other parameters are passed through the stack:
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; buffer,size = data to transfer
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; flags = same as in usb_open_pipe:
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; bit 0 = allow short transfer, other bits reserved
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; td = pointer to the current end-of-queue descriptor
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; direction =
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; 0000b for normal transfers,
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; 1000b for control SETUP transfer,
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; 1101b for control OUT transfer,
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; 1110b for control IN transfer
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; returns eax = pointer to the new end-of-queue descriptor
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; (not included in the queue itself) or 0 on error
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InsertTransfer dd ?
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; Activate previously initialized transfer (maybe with multiple stages).
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; esi -> usb_controller, ebx -> usb_pipe,
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; [esp+4] -> first usb_gtd for the transfer,
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; ecx -> last descriptor for the transfer
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NewDevice dd ?
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; Initiate configuration of a new device (create pseudo-pipe describing that
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; device and call usb_new_device).
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; esi -> usb_controller, eax = speed (one of USB_SPEED_* constants).
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ends
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; =============================================================================
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; =================================== Code ====================================
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; =============================================================================
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; Initializes one controller, called by usb_init for every controller.
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; edi -> usb_hardware_func, eax -> PCIDEV structure for the device.
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proc usb_init_controller
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push ebp
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mov ebp, esp
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; 1. Store in the stack PCI coordinates and save pointer to PCIDEV:
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; make [ebp-4] = (bus shl 8) + devfn, used by controller-specific Init funcs.
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push dword [eax+PCIDEV.devfn]
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push eax
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; 2. Allocate *hci_controller + usb_controller.
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mov ebx, [edi+usb_hardware_func.DataSize]
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add ebx, sizeof.usb_controller
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stdcall kernel_alloc, ebx
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test eax, eax
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jz .nothing
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; 3. Zero-initialize both structures.
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push edi eax
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mov ecx, ebx
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shr ecx, 2
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xchg edi, eax
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xor eax, eax
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rep stosd
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; 4. Initialize usb_controller structure,
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; except data known only to controller-specific code (like NumPorts)
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; and link fields
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; (this structure will be inserted to the overall list at step 6).
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dec eax
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mov [edi+usb_controller.ExistingAddresses+4-sizeof.usb_controller], eax
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mov [edi+usb_controller.ExistingAddresses+8-sizeof.usb_controller], eax
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mov [edi+usb_controller.ExistingAddresses+12-sizeof.usb_controller], eax
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mov [edi+usb_controller.ResettingPort-sizeof.usb_controller], al ; no resetting port
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dec eax ; don't allocate zero address
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mov [edi+usb_controller.ExistingAddresses-sizeof.usb_controller], eax
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lea ecx, [edi+usb_controller.PeriodicLock-sizeof.usb_controller]
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call mutex_init
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add ecx, usb_controller.ControlLock - usb_controller.PeriodicLock
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call mutex_init
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add ecx, usb_controller.BulkLock - usb_controller.ControlLock
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call mutex_init
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pop eax edi
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mov [eax+ebx-sizeof.usb_controller+usb_controller.HardwareFunc], edi
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push eax
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; 5. Call controller-specific initialization.
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; If failed, free memory allocated in step 2 and return.
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call [edi+usb_hardware_func.Init]
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test eax, eax
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jz .fail
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pop ecx
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; 6. Insert the controller to the global list.
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xchg eax, ebx
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mov ecx, usb_controllers_list_mutex
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call mutex_lock
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mov edx, usb_controllers_list
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mov eax, [edx+usb_controller.Prev]
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mov [ebx+usb_controller.Next], edx
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mov [ebx+usb_controller.Prev], eax
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mov [edx+usb_controller.Prev], ebx
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mov [eax+usb_controller.Next], ebx
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call mutex_unlock
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; 7. Wakeup USB thread to call ProcessDeferred.
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call usb_wakeup
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.nothing:
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; 8. Restore pointer to PCIDEV saved in step 1 and return.
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pop eax
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leave
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ret
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.fail:
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call kernel_free
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jmp .nothing
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endp
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; Helper function, calculates physical address including offset in page.
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proc get_phys_addr
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push ecx
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mov ecx, eax
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and ecx, 0xFFF
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call get_pg_addr
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add eax, ecx
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pop ecx
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ret
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endp
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; Put the given control pipe in the wait list;
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; called when the pipe structure is changed and a possible hardware cache
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; needs to be synchronized. When it will be known that the cache is updated,
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; usb_subscription_done procedure will be called.
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proc usb_subscribe_control
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cmp [ebx+usb_pipe.NextWait], -1
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jnz @f
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mov eax, [esi+usb_controller.WaitPipeListAsync]
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mov [ebx+usb_pipe.NextWait], eax
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mov [esi+usb_controller.WaitPipeListAsync], ebx
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@@:
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ret
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endp
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; Called after synchronization of hardware cache with software changes.
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; Continues process of device enumeration based on when it was delayed
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; due to call to usb_subscribe_control.
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proc usb_subscription_done
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mov eax, [ebx+usb_pipe.DeviceData]
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cmp [eax+usb_device_data.DeviceDescrSize], 0
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jz usb_after_set_address
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jmp usb_after_set_endpoint_size
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endp
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; This function is called when a new device has either passed
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; or failed first stages of configuration, so the next device
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; can enter configuration process.
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proc usb_test_pending_port
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mov [esi+usb_controller.ResettingPort], -1
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cmp [esi+usb_controller.PendingPorts], 0
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jz .nothing
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bsf ecx, [esi+usb_controller.PendingPorts]
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btr [esi+usb_controller.PendingPorts], ecx
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mov eax, [esi+usb_controller.HardwareFunc]
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jmp [eax+usb_hardware_func.InitiateReset]
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.nothing:
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ret
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endp
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; This procedure is regularly called from controller-specific ProcessDeferred,
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; it checks whether there are disconnected events and if so, process them.
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proc usb_disconnect_stage2
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bsf ecx, [esi+usb_controller.NewDisconnected]
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jz .nothing
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lock btr [esi+usb_controller.NewDisconnected], ecx
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btr [esi+usb_controller.PendingPorts], ecx
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xor ebx, ebx
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xchg ebx, [esi+usb_controller.DevicesByPort+ecx*4]
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test ebx, ebx
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jz usb_disconnect_stage2
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call usb_device_disconnected
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jmp usb_disconnect_stage2
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.nothing:
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ret
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endp
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; Initial stage of disconnect processing: called when device is disconnected.
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proc usb_device_disconnected
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; Loop over all pipes, close everything, wait until hardware reacts.
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; The final handling is done in usb_pipe_closed.
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push ebx
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mov ecx, [ebx+usb_pipe.DeviceData]
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call mutex_lock
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lea eax, [ecx+usb_device_data.OpenedPipeList-usb_pipe.NextSibling]
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push eax
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mov ebx, [eax+usb_pipe.NextSibling]
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.pipe_loop:
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call usb_close_pipe_nolock
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mov ebx, [ebx+usb_pipe.NextSibling]
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cmp ebx, [esp]
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jnz .pipe_loop
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pop eax
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pop ebx
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mov ecx, [ebx+usb_pipe.DeviceData]
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call mutex_unlock
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ret
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endp
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; Called from controller-specific ProcessDeferred,
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; processes wait-pipe-done notifications,
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; returns whether there are more items in wait queues.
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; in: esi -> usb_controller
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; out: eax = bitmask of pipe types with non-empty wait queue
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proc usb_process_wait_lists
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xor edx, edx
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push edx
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call usb_process_one_wait_list
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jnc @f
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or byte [esp], 1 shl CONTROL_PIPE
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@@:
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movi edx, 4
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call usb_process_one_wait_list
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jnc @f
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or byte [esp], 1 shl INTERRUPT_PIPE
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@@:
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xor edx, edx
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call usb_process_one_wait_list
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jnc @f
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or byte [esp], 1 shl CONTROL_PIPE
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@@:
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pop eax
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ret
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endp
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; Helper procedure for usb_process_wait_lists;
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; does the same for one wait queue.
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; in: esi -> usb_controller,
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; edx=0 for *Async, edx=4 for *Periodic list
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; out: CF = issue new request
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proc usb_process_one_wait_list
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; 1. Check whether there is a pending request. If so, do nothing.
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mov ebx, [esi+usb_controller.WaitPipeRequestAsync+edx]
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cmp ebx, [esi+usb_controller.ReadyPipeHeadAsync+edx]
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clc
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jnz .nothing
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; 2. Check whether there are new data. If so, issue a new request.
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cmp ebx, [esi+usb_controller.WaitPipeListAsync+edx]
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stc
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jnz .nothing
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test ebx, ebx
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jz .nothing
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; 3. Clear all lists.
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xor ecx, ecx
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mov [esi+usb_controller.WaitPipeListAsync+edx], ecx
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mov [esi+usb_controller.WaitPipeRequestAsync+edx], ecx
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mov [esi+usb_controller.ReadyPipeHeadAsync+edx], ecx
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; 4. Loop over all pipes from the wait list.
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.pipe_loop:
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; For every pipe:
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; 5. Save edx and next pipe in the list.
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push edx
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push [ebx+usb_pipe.NextWait]
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; 6. If USB_FLAG_EXTRA_WAIT is set, reinsert the pipe to the list and continue.
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test [ebx+usb_pipe.Flags], USB_FLAG_EXTRA_WAIT
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jz .process
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mov eax, [esi+usb_controller.WaitPipeListAsync+edx]
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mov [ebx+usb_pipe.NextWait], eax
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mov [esi+usb_controller.WaitPipeListAsync+edx], ebx
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jmp .continue
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.process:
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; 7. Call the handler depending on USB_FLAG_CLOSED.
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or [ebx+usb_pipe.NextWait], -1
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test [ebx+usb_pipe.Flags], USB_FLAG_CLOSED
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jz .nodisconnect
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call usb_pipe_closed
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jmp .continue
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.nodisconnect:
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call usb_subscription_done
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.continue:
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; 8. Restore edx and next pipe saved in step 5 and continue the loop.
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pop ebx
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pop edx
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test ebx, ebx
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jnz .pipe_loop
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.check_new_work:
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; 9. Set CF depending on whether WaitPipeList* is nonzero.
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cmp [esi+usb_controller.WaitPipeListAsync+edx], 1
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cmc
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.nothing:
|
|
ret
|
|
endp
|