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; Code for OHCI controllers.

; Note: it should be moved to an external driver,

; it was convenient to have this code compiled into the kernel during initial

; development, but there are no reasons to keep it here.

; =============================================================================

; ================================= Constants =================================

; =============================================================================

; OHCI register declarations

; All of the registers should be read and written as Dwords.

; Partition 1. Control and Status registers.

OhciRevisionReg         = 0

OhciControlReg          = 4

OhciCommandStatusReg    = 8

OhciInterruptStatusReg  = 0Ch

OhciInterruptEnableReg  = 10h

OhciInterruptDisableReg = 14h

; Partition 2. Memory Pointer registers.

OhciHCCAReg             = 18h

OhciPeriodCurrentEDReg  = 1Ch

OhciControlHeadEDReg    = 20h

OhciControlCurrentEDReg = 24h

OhciBulkHeadEDReg       = 28h

OhciBulkCurrentEDReg    = 2Ch

OhciDoneHeadReg         = 30h

; Partition 3. Frame Counter registers.

OhciFmIntervalReg       = 34h

OhciFmRemainingReg      = 38h

OhciFmNumberReg         = 3Ch

OhciPeriodicStartReg    = 40h

OhciLSThresholdReg      = 44h

; Partition 4. Root Hub registers.

OhciRhDescriptorAReg    = 48h

OhciRhDescriptorBReg    = 4Ch

OhciRhStatusReg         = 50h

OhciRhPortStatusReg     = 54h

; =============================================================================

; ================================ Structures =================================

; =============================================================================

; OHCI-specific part of a pipe descriptor.

; * This structure corresponds to the Endpoint Descriptor aka ED from the OHCI

;   specification.

; * The hardware requires 16-bytes alignment of the hardware part.

;   Since the allocator (usb_allocate_common) allocates memory sequentially

;   from page start (aligned on 0x1000 bytes), block size for the allocator

;   must be divisible by 16; usb1_allocate_endpoint ensures this.

struct ohci_pipe

; All addresses are physical.

Flags           dd      ?

; 1. Lower 7 bits (bits 0-6) are FunctionAddress. This is the USB address of

;    the function containing the endpoint that this ED controls.

; 2. Next 4 bits (bits 7-10) are EndpointNumber. This is the USB address of

;    the endpoint within the function.

; 3. Next 2 bits (bits 11-12) are Direction. This 2-bit field indicates the

;    direction of data flow: 1 = IN, 2 = OUT. If neither IN nor OUT is

;    specified, then the direction is determined from the PID field of the TD.

;    For CONTROL endpoints, the transfer direction is different

;    for different transfers, so the value of this field is 0

;    (3 would have the same effect) and the actual direction

;    of one transfer is encoded in the Transfer Descriptor.

; 4. Next bit (bit 13) is Speed bit. It indicates the speed of the endpoint:

;    full-speed (S = 0) or low-speed (S = 1).

; 5. Next bit (bit 14) is sKip bit. When this bit is set, the hardware

;    continues on to the next ED on the list without attempting access

;    to the TD queue or issuing any USB token for the endpoint.

;    Always cleared.

; 6. Next bit (bit 15) is Format bit. It must be 0 for Control, Bulk and

;    Interrupt endpoints and 1 for Isochronous endpoints.

; 7. Next 11 bits (bits 16-26) are MaximumPacketSize. This field indicates

;    the maximum number of bytes that can be sent to or received from the

;    endpoint in a single data packet.

TailP           dd      ?

; Physical address of the tail descriptor in the TD queue.

; The descriptor itself is not in the queue. See also HeadP.

HeadP           dd      ?

; 1. First bit (bit 0) is Halted bit. This bit is set by the hardware to

;    indicate that processing of the TD queue on the endpoint is halted.

; 2. Second bit (bit 1) is toggleCarry bit. Whenever a TD is retired, this

;    bit is written to contain the last data toggle value from the retired TD.

; 3. Next two bits (bits 2-3) are reserved and always zero.

; 4. With masked 4 lower bits, this is HeadP itself: physical address of the

;    head descriptor in the TD queue, that is, next TD to be processed for this

;    endpoint. Note that a TD must be 16-bytes aligned.

;    Empty queue is characterized by the condition HeadP == TailP.

NextED          dd      ?

; If nonzero, then this entry is a physical address of the next ED to be

; processed. See also the description before NextVirt field of the usb_pipe

; structure. Additionally to that description, the following is specific for

; the OHCI controller:

; * n=5, N=32, there are 32 "leaf" periodic lists.

; * The 1ms periodic list also serves Isochronous endpoints, which should be

;   in the end of the list.

; * There is no "next" list for Bulk and Control lists, they are processed

;   separately from others.

; * There is no "next" list for Periodic list for 1ms interval.

ends

; This structure describes the static head of every list of pipes.

; The hardware requires 16-bytes alignment of this structure.

; All instances of this structure are located sequentially in uhci_controller,

; uhci_controller is page-aligned, so it is sufficient to make this structure

; 16-bytes aligned and verify that the first instance is 16-bytes aligned

; inside uhci_controller.

struct ohci_static_ep

Flags           dd      ?

; Same as ohci_pipe.Flags.

; sKip bit is set, so the hardware ignores other fields except NextED.

                dd      ?

; Corresponds to ohci_pipe.TailP. Not used.

NextList        dd      ?

; Virtual address of the next list.

NextED          dd      ?

; Same as ohci_pipe.NextED.

SoftwarePart    rd      sizeof.usb_static_ep/4

; Software part, common for all controllers.

                dd      ?

; Padding for 16-bytes alignment.

ends

if sizeof.ohci_static_ep mod 16

.err ohci_static_ep must be 16-bytes aligned

end if

; OHCI-specific part of controller data.

; * The structure describes the memory area used for controller data,

;   additionally to the registers of the controller.

; * The structure includes two parts, the hardware part and the software part.

; * The hardware part consists of first 256 bytes and corresponds to

;   the HCCA from OHCI specification.

; * The hardware requires 256-bytes alignment of the hardware part, so

;   the entire descriptor must be 256-bytes aligned.

;   This structure is allocated with kernel_alloc (see usb_init_controller),

;   this gives page-aligned data.

; * The controller is described by both ohci_controller and usb_controller

;   structures, for each controller there is one ohci_controller and one

;   usb_controller structure. These structures are located sequentially

;   in the memory: beginning from some page start, there is ohci_controller

;   structure - this enforces hardware alignment requirements - and then

;   usb_controller structure.

; * The code keeps pointer to usb_controller structure. The ohci_controller

;   structure is addressed as [ptr + ohci_controller.field - sizeof.ohci_controller].

struct ohci_controller

; ------------------------------ hardware fields ------------------------------

InterruptTable  rd      32

; Pointers to interrupt EDs. The hardware starts processing of periodic lists

; within the frame N from the ED pointed to by [InterruptTable+(N and 31)*4].

; See also the description of periodic lists inside ohci_pipe structure.

FrameNumber     dw      ?

; The current frame number. This field is written by hardware only.

; This field is read by ohci_process_deferred and ohci_irq to

; communicate when control/bulk processing needs to be temporarily

; stopped/restarted.

                dw      ?

; Padding. Written as zero at every update of FrameNumber.

DoneHead        dd      ?

; Physical pointer to the start of Done Queue.

; When the hardware updates this field, it sets bit 0 to one if there is

; unmasked interrupt pending.

                rb      120

; Reserved for the hardware.

; ------------------------------ software fields ------------------------------

IntEDs          ohci_static_ep

                rb      62 * sizeof.ohci_static_ep

; Heads of 63 Periodic lists, see the description in usb_pipe.

ControlED       ohci_static_ep

; Head of Control list, see the description in usb_pipe.

BulkED          ohci_static_ep

; Head of Bulk list, see the description in usb_pipe.

MMIOBase        dd      ?

; Virtual address of memory-mapped area with OHCI registers OhciXxxReg.

PoweredUp       db      ?

; 1 in normal work, 0 during early phases of the initialization.

; This field is initialized to zero during memory allocation

; (see usb_init_controller), set to one by ohci_init when ports of the root hub

; are powered up, so connect/disconnect events can be handled.

                rb      3 ; alignment

DoneList        dd      ?

; List of descriptors which were processed by the controller and now need

; to be finalized.

DoneListEndPtr  dd      ?

; Pointer to dword which should receive a pointer to the next item in DoneList.

; If DoneList is empty, this is a pointer to DoneList itself;

; otherwise, this is a pointer to NextTD field of the last item in DoneList.

ends

if ohci_controller.IntEDs mod 16

.err Static endpoint descriptors must be 16-bytes aligned inside ohci_controller

end if

; OHCI general transfer descriptor.

; * The structure describes transfers to be performed on Control, Bulk or

;   Interrupt endpoints.

; * The structure includes two parts, the hardware part and the software part.

; * The hardware part consists of first 16 bytes and corresponds to

;   the General Transfer Descriptor aka general TD from OHCI specification.

; * The hardware requires 16-bytes alignment of the hardware part, so

;   the entire descriptor must be 16-bytes aligned. Since the allocator

;   (usb_allocate_common) allocates memory sequentially from page start

;   (aligned on 0x1000 bytes), block size for the allocator must be

;   divisible by 16; usb1_allocate_generic_td ensures this.

struct ohci_gtd

; ------------------------------ hardware fields ------------------------------

; All addresses in this part are physical.

Flags           dd      ?

; 1. Lower 18 bits (bits 0-17) are ignored and not modified by the hardware.

; 2. Next bit (bit 18) is bufferRounding bit. If this bit is 0, then the last

;    data packet must exactly fill the defined data buffer. If this bit is 1,

;    then the last data packet may be smaller than the defined buffer without

;    causing an error condition on the TD.

; 3. Next 2 bits (bits 19-20) are Direction field. This field indicates the

;    direction of data flow. If the Direction field in the ED is OUT or IN,

;    this field is ignored and the direction from the ED is used instead.

;    Otherwise, 0 = SETUP, 1 = OUT, 2 = IN, 3 is reserved.

; 4. Next 3 bits (bits 21-23) are DelayInterrupt field. This field contains

;    the interrupt delay count for this TD. When a TD is complete, the hardware

;    may wait up to DelayInterrupt frames before generating an interrupt.

;    If DelayInterrupt is 7 (maximum possible), then there is no interrupt

;    associated with completion of this TD.

; 5. Next 2 bits (bits 24-25) are DataToggle field. This field is used to

;    generate/compare the data PID value (DATA0 or DATA1). It is updated after

;    each successful transmission/reception of a data packet. The bit 25

;    is 0 when the data toggle value is acquired from the toggleCarry field in

;    the ED and 1 when the data toggle value is taken from the bit 24.

; 6. Next 2 bits (bits 26-27) are ErrorCount field. For each transmission

;    error, this value is incremented. If ErrorCount is 2 and another error

;    occurs, the TD is retired with error. When a transaction completes without

;    error, ErrorCount is reset to 0.

; 7. Upper 4 bits (bits 28-31) are ConditionCode field. This field contains

;    the status of the last attempted transaction, one of USB_STATUS_* values.

CurBufPtr       dd      ?

; Physical address of the next memory location that will be accessed for

; transfer to/from the endpoint. 0 means zero-length data packet or that all

; bytes have been transferred.

NextTD          dd      ?

; This field has different meanings depending on the status of the descriptor.

; When the descriptor is queued for processing, but not yet processed:

;   Physical address of the next TD for the endpoint.

; When the descriptor is processed by hardware, but not yet by software:

;   Physical address of the previous processed TD.

; When the descriptor is processed by the IRQ handler, but not yet completed:

;   Virtual pointer to the next processed TD.

BufEnd          dd      ?

; Physical address of the last byte in the buffer for this TD.

                dd      ?       ; padding to align with uhci_gtd

ends

; OHCI isochronous transfer descriptor.

; * The structure describes transfers to be performed on Isochronous endpoints.

; * The structure includes two parts, the hardware part and the software part.

; * The hardware part consists of first 32 bytes and corresponds to

;   the Isochronous Transfer Descriptor aka isochronous TD from OHCI

;   specification.

; * The hardware requires 32-bytes alignment of the hardware part, so

;   the entire descriptor must be 32-bytes aligned.

; * The isochronous endpoints are not supported yet, so only hardware part is

;   defined at the moment.

struct ohci_itd

StartingFrame   dw      ?

; This field contains the low order 16 bits of the frame number in which the

; first data packet of the Isochronous TD is to be sent.

Flags           dw      ?

; 1. Lower 5 bits (bits 0-4) are ignored and not modified by the hardware.

; 2. Next 3 bits (bits 5-7) are DelayInterrupt field.

; 3. Next 3 bits (bits 8-10) are FrameCount field. The TD describes

;    FrameCount+1 data packets.

; 4. Next bit (bit 11) is ignored and not modified by the hardware.

; 5. Upper 4 bits (bits 12-15) are ConditionCode field. This field contains

;    the completion code, one of USB_STATUS_* values, when the TD is moved to

;    the Done Queue.

BufPage0        dd      ?

; Lower 12 bits are ignored and not modified by the hardware.

; With masked 12 bits this field is the physical page containing all buffers.

NextTD          dd      ?

; Physical address of the next TD in the transfer queue.

BufEnd          dd      ?

; Physical address of the last byte in the buffer.

OffsetArray     rw      8

; Initialized by software, read by hardware: Offset for packet 0..7.

; Used to determine size and starting address of an isochronous data packet.

; Written by hardware, read by software: PacketStatusWord for packet 0..7.

; Contains completion code and, if applicable, size received for an isochronous

; data packet.

ends

; Description of OHCI-specific data and functions for

; controller-independent code.

; Implements the structure usb_hardware_func from hccommon.inc for OHCI.

iglobal

align 4

ohci_hardware_func:

        dd      'OHCI'

        dd      sizeof.ohci_controller

        dd      ohci_init

        dd      ohci_process_deferred

        dd      ohci_set_device_address

        dd      ohci_get_device_address

        dd      ohci_port_disable

        dd      ohci_new_port.reset

        dd      ohci_set_endpoint_packet_size

        dd      usb1_allocate_endpoint

        dd      usb1_free_endpoint

        dd      ohci_init_pipe

        dd      ohci_unlink_pipe

        dd      usb1_allocate_general_td

        dd      usb1_free_general_td

        dd      ohci_alloc_transfer

        dd      ohci_insert_transfer

        dd      ohci_new_device

endg

; =============================================================================

; =================================== Code ====================================

; =============================================================================

; Controller-specific initialization function.

; Called from usb_init_controller. Initializes the hardware and

; OHCI-specific parts of software structures.

; eax = pointer to ohci_controller to be initialized

; [ebp-4] = pcidevice

proc ohci_init

; inherit some variables from the parent (usb_init_controller)

.devfn   equ ebp - 4

.bus     equ ebp - 3

; 1. Store pointer to ohci_controller for further use.

        push    eax

        mov     edi, eax

; 2. Initialize hardware fields of ohci_controller.

; Namely, InterruptTable needs to be initialized with

; physical addresses of heads of first 32 Periodic lists.

; Note that all static heads fit in one page, so one call

; to get_pg_addr is sufficient.

if (ohci_controller.IntEDs / 0x1000) <> (ohci_controller.BulkED / 0x1000)

.err assertion failed

end if

if ohci_controller.IntEDs >= 0x1000

.err assertion failed

end if

        lea     esi, [eax+ohci_controller.IntEDs+32*sizeof.ohci_static_ep]

        call    get_pg_addr

        add     eax, ohci_controller.IntEDs

        movi    ecx, 32

        mov     edx, ecx

@@:

        stosd

        add     eax, sizeof.ohci_static_ep

        loop    @b

; 3. Initialize static heads ohci_controller.IntEDs, .ControlED, .BulkED.

; Use the loop over groups: first group consists of first 32 Periodic

; descriptors, next group consists of next 16 Periodic descriptors,

; ..., last group consists of the last Periodic descriptor.

; 3a. Prepare for the loop.

; make edi point to start of ohci_controller.IntEDs,

; other registers are already set.

; -128 fits in one byte, +128 does not fit.

        sub     edi, -128

; 3b. Loop over groups. On every iteration:

; edx = size of group, edi = pointer to the current group,

; esi = pointer to the next group, eax = physical address of the next group.

.init_static_eds:

; 3c. Get the size of the next group.

        shr     edx, 1

; 3d. Exit the loop if there is no next group.

        jz      .init_static_eds_done

; 3e. Initialize the first half of the current group.

; Advance edi to the second half.

        push    eax esi

        call    ohci_init_static_ep_group

        pop     esi eax

; 3f. Initialize the second half of the current group

; with the same values.

; Advance edi to the next group, esi/eax to the next of the next group.

        call    ohci_init_static_ep_group

        jmp     .init_static_eds

.init_static_eds_done:

; 3g. Initialize the head of the last Periodic list.

        xor     eax, eax

        xor     esi, esi

        call    ohci_init_static_endpoint

; 3i. Initialize the heads of Control and Bulk lists.

        call    ohci_init_static_endpoint

        call    ohci_init_static_endpoint

; 4. Create a virtual memory area to talk with the controller.

; 4a. Enable memory & bus master access.

        mov     ch, [.bus]

        mov     cl, 0

        mov     eax, ecx

        mov     bh, [.devfn]

        mov     bl, 4

        call    pci_read_reg

        or      al, 6

        xchg    eax, ecx

        call    pci_write_reg

; 4b. Read memory base address.

        mov     ah, [.bus]

        mov     al, 2

        mov     bl, 10h

        call    pci_read_reg

        and     al, not 0Fh

; 4c. Create mapping for physical memory. 256 bytes are sufficient.

        stdcall map_io_mem, eax, 100h, PG_SW+PG_NOCACHE

        test    eax, eax

        jz      .fail

        stosd   ; fill ohci_controller.MMIOBase

        xchg    eax, edi

; now edi = MMIOBase

; 5. Reset the controller if needed.

; 5a. Check operational state.

; 0 = reset, 1 = resume, 2 = operational, 3 = suspended

        mov     eax, [edi+OhciControlReg]

        and     al, 3 shl 6

        cmp     al, 2 shl 6

        jz      .operational

; 5b. State is not operational, reset is needed.

.reset:

; 5c. Save FmInterval register.

        pushd   [edi+OhciFmIntervalReg]

; 5d. Issue software reset and wait up to 10ms, checking status every 1 ms.

        movi    ecx, 1

        movi    edx, 10

        mov     [edi+OhciCommandStatusReg], ecx

@@:

        mov     esi, ecx

        call    delay_ms

        test    [edi+OhciCommandStatusReg], ecx

        jz      .resetdone

        dec     edx

        jnz     @b

        pop     eax

        dbgstr 'controller reset timeout'

        jmp     .fail_unmap

.resetdone:

; 5e. Restore FmInterval register.

        pop     eax

        mov     edx, eax

        and     edx, 3FFFh

        jz      .setfminterval

        cmp     dx, 2EDFh       ; default value?

        jnz     @f              ; assume that BIOS has configured the value

.setfminterval:

        mov     eax, 27792EDFh  ; default value

@@:

        mov     [edi+OhciFmIntervalReg], eax

; 5f. Set PeriodicStart to 90% of FmInterval.

        movzx   eax, ax

; Two following lines are equivalent to eax = floor(eax * 0.9)

; for any 0 <= eax < 1C71C71Dh, which of course is far from maximum 0FFFFh.

        mov     edx, 0E6666667h

        mul     edx

        mov     [edi+OhciPeriodicStartReg], edx

.operational:

; 6. Setup controller registers.

        pop     esi     ; restore pointer to ohci_controller saved in step 1

; 6a. Physical address of HCCA.

        mov     eax, esi

        call    get_pg_addr

        mov     [edi+OhciHCCAReg], eax

; 6b. Transition to operational state and clear all Enable bits.

        mov     cl, 2 shl 6

        mov     [edi+OhciControlReg], ecx

; 6c. Physical addresses of head of Control and Bulk lists.

if ohci_controller.BulkED >= 0x1000

.err assertion failed

end if

        add     eax, ohci_controller.ControlED

        mov     [edi+OhciControlHeadEDReg], eax

        add     eax, ohci_controller.BulkED - ohci_controller.ControlED

        mov     [edi+OhciBulkHeadEDReg], eax

; 6d. Zero Head registers: there are no active Control and Bulk descriptors yet.

        xor     eax, eax

;       mov     [edi+OhciPeriodCurrentEDReg], eax

        mov     [edi+OhciControlCurrentEDReg], eax

        mov     [edi+OhciBulkCurrentEDReg], eax

;       mov     [edi+OhciDoneHeadReg], eax

; 6e. Enable processing of all lists with control:bulk ratio = 1:1.

        mov     dword [edi+OhciControlReg], 10111100b

; 7. Get number of ports.

        add     esi, sizeof.ohci_controller

        mov     eax, [edi+OhciRhDescriptorAReg]

        and     eax, 0xF

        mov     [esi+usb_controller.NumPorts], eax

; 8. Initialize DoneListEndPtr to point to DoneList.

        lea     eax, [esi+ohci_controller.DoneList-sizeof.ohci_controller]

        mov     [esi+ohci_controller.DoneListEndPtr-sizeof.ohci_controller], eax

; 9. Hook interrupt.

        mov     ah, [.bus]

        mov     al, 0

        mov     bh, [.devfn]

        mov     bl, 3Ch

        call    pci_read_reg

; al = IRQ

        movzx   eax, al

        stdcall attach_int_handler, eax, ohci_irq, esi

; 10. Enable controller interrupt on HcDoneHead writeback and RootHubStatusChange.

        mov     dword [edi+OhciInterruptEnableReg], 80000042h

        DEBUGF 1,'K : OHCI controller at %x:%x with %d ports initialized\n',[.bus]:2,[.devfn]:2,[esi+usb_controller.NumPorts]

; 11. Initialize ports of the controller.

; 11a. Initiate power up, disable all ports, clear all "changed" bits.

        mov     dword [edi+OhciRhStatusReg], 10000h     ; SetGlobalPower

        xor     ecx, ecx

@@:

        mov     dword [edi+OhciRhPortStatusReg+ecx*4], 1F0101h  ; SetPortPower+ClearPortEnable+clear "changed" bits

        inc     ecx

        cmp     ecx, [esi+usb_controller.NumPorts]

        jb      @b

; 11b. Wait for power up.

; VirtualBox has AReg == 0, delay_ms doesn't like zero value; ignore zero delay

        push    esi

        mov     esi, [edi+OhciRhDescriptorAReg]

        shr     esi, 24

        add     esi, esi

        jz      @f

        call    delay_ms

@@:

        pop     esi

; 11c. Ports are powered up; now it is ok to process connect/disconnect events.

        mov     [esi+ohci_controller.PoweredUp-sizeof.ohci_controller], 1

                ; IRQ handler doesn't accept connect/disconnect events before this point

; 11d. We could miss some events while waiting for powering up;

; scan all ports manually and check for connected devices.

        xor     ecx, ecx

.port_loop:

        test    dword [edi+OhciRhPortStatusReg+ecx*4], 1

        jz      .next_port

; There is a connected device; mark the port as 'connected'

; and save the connected time.

; Note that ConnectedTime must be set before 'connected' mark,

; otherwise the code in ohci_process_deferred could use incorrect time.

        mov     eax, [timer_ticks]

        mov     [esi+usb_controller.ConnectedTime+ecx*4], eax

        lock bts [esi+usb_controller.NewConnected], ecx

.next_port:

        inc     ecx

        cmp     ecx, [esi+usb_controller.NumPorts]

        jb      .port_loop

; 12. Return pointer to usb_controller.

        xchg    eax, esi

        ret

.fail_unmap:

; On error after step 4, release the virtual memory area.

        stdcall free_kernel_space, edi

.fail:

; On error, free the ohci_controller structure and return zero.

; Note that the pointer was placed in the stack at step 1.

; Note also that there can be no errors after step 8,

; where that pointer is popped from the stack.

        pop     ecx

.nothing:

        xor     eax, eax

        ret

endp

; Helper procedure for step 3 of ohci_init.

; Initializes the static head of one list.

; eax = physical address of the "next" list, esi = pointer to the "next" list,

; edi = pointer to head to initialize.

; Advances edi to the next head, keeps eax/esi.

proc ohci_init_static_endpoint

        mov     byte [edi+ohci_static_ep.Flags+1], 1 shl (14 - 8)       ; sKip this endpoint

        mov     [edi+ohci_static_ep.NextED], eax

        mov     [edi+ohci_static_ep.NextList], esi

        add     edi, ohci_static_ep.SoftwarePart

        call    usb_init_static_endpoint

        add     edi, sizeof.ohci_static_ep - ohci_static_ep.SoftwarePart

        ret

endp

; Helper procedure for step 3 of ohci_init.

; Initializes one half of group of static heads.

; edx = size of the next group = half of size of the group,

; edi = pointer to the group, eax = physical address of the next group,

; esi = pointer to the next group.

; Advances eax, esi, edi to next group, keeps edx.

proc ohci_init_static_ep_group

        push    edx

@@:

        call    ohci_init_static_endpoint

        add     eax, sizeof.ohci_static_ep

        add     esi, sizeof.ohci_static_ep

        dec     edx

        jnz     @b

        pop     edx

        ret

endp

; Controller-specific pre-initialization function: take ownership from BIOS.

; Some BIOSes, although not all of them, provide legacy emulation

; for USB keyboard and/or mice as PS/2-devices. In this case,

; we must notify the BIOS that we don't need that emulation and know how to

; deal with USB devices.

proc ohci_kickoff_bios

; 1. Get the physical address of MMIO registers.

        mov     ah, [esi+PCIDEV.bus]

        mov     bh, [esi+PCIDEV.devfn]

        mov     al, 2

        mov     bl, 10h

        call    pci_read_reg

        and     al, not 0Fh

; 2. Create mapping for physical memory. 256 bytes are sufficient.

        stdcall map_io_mem, eax, 100h, PG_SW+PG_NOCACHE

        test    eax, eax

        jz      .nothing

; 3. Some BIOSes enable controller interrupts as a result of giving

; controller away. At this point the system knows nothing about how to serve

; OHCI interrupts, so such an interrupt will send the system into an infinite

; loop handling the same IRQ again and again. Thus, we need to block OHCI

; interrupts. We can't do this at the controller level until step 5,

; because the controller is currently owned by BIOS, so we block all hardware

; interrupts on this processor until step 5.

        pushf

        cli

; 4. Take the ownership over the controller.

; 4a. Check whether BIOS handles this controller at all.

        mov     edx, 100h

        test    dword [eax+OhciControlReg], edx

        jz      .has_ownership

; 4b. Send "take ownership" command to the BIOS.

; (This should generate SMI, BIOS should release its ownership in SMI handler.)

        mov     dword [eax+OhciCommandStatusReg], 8

; 4c. Wait for result no more than 50 ms, checking for status every 1 ms.

        movi    ecx, 50

@@:

        test    dword [eax+OhciControlReg], edx

        jz      .has_ownership

        push    esi

        movi    esi, 1

        call    delay_ms

        pop     esi

        loop    @b

        dbgstr 'warning: taking OHCI ownership from BIOS timeout'

.has_ownership:

; 5. Disable all controller interrupts until the system will be ready to

; process them.

        mov     dword [eax+OhciInterruptDisableReg], 0C000007Fh

; 6. Now we can unblock interrupts in the processor.

        popf

; 7. Release memory mapping created in step 2 and return.

        stdcall free_kernel_space, eax

.nothing:

        ret

endp

; IRQ handler for OHCI controllers.

ohci_irq.noint:

; Not our interrupt: restore registers and return zero.

        xor     eax, eax

        pop     edi esi ebx

        ret

proc ohci_irq

        push    ebx esi edi     ; save used registers to be cdecl

virtual at esp

                rd      3       ; saved registers

                dd      ?       ; return address

.controller     dd      ?

end virtual

; 1. ebx will hold whether some deferred processing is needed,

; that cannot be done from the interrupt handler. Initialize to zero.

        xor     ebx, ebx

; 2. Get the mask of events which should be processed.

        mov     esi, [.controller]

        mov     edi, [esi+ohci_controller.MMIOBase-sizeof.ohci_controller]

        mov     eax, [edi+OhciInterruptStatusReg]

; 3. Check whether that interrupt has been generated by our controller.

; (One IRQ can be shared by several devices.)

        and     eax, [edi+OhciInterruptEnableReg]

        jz      .noint

; 4. Get the physical pointer to the last processed descriptor.

; All processed descriptors form single-linked list from last to first

; with the help of NextTD field. The list is restarted every time when

; the controller writes to DoneHead, so grab the pointer now (before the next

; step) or it could be lost (the controller could write new value to DoneHead

; any time after WorkDone bit is cleared in OhciInterruptStatusReg).

        mov     ecx, [esi+ohci_controller.DoneHead-sizeof.ohci_controller]

        and     ecx, not 1

; 5. Clear the events we know of.

; Note that this should be done before processing of events:

; new events could arise while we are processing those, this way we won't lose

; them (the controller would generate another interrupt

; after completion of this one).

        mov     [edi+OhciInterruptStatusReg], eax

; 6. Save the mask of events for further reference.

        push    eax

; 7. Handle 'transfer is done' events.

; 7a. Test whether there are such events.

        test    al, 2

        jz      .skip_donehead

; There are some 'transfer is done' events, processed descriptors are linked

; through physical addresses in the reverse order.

; We can't do much in an interrupt handler, since callbacks could require

; waiting for locks and that can't be done in an interrupt handler.

; However, we can't also just defer all work to the USB thread, since

; it is possible that previous lists are not yet processed and it is hard

; to store unlimited number of list heads. Thus, we reverse the current list,

; append it to end of the previous list (if there is one) and defer other

; processing to the USB thread; this way there always is no more than one list

; (possibly joined from several controller-reported lists).

; The list traversal requires converting physical addresses to virtual pointers,

; so we may as well store pointers instead of physical addresses.

; 7b. Prepare for the reversing loop.

        push    ebx

        xor     ebx, ebx

        test    ecx, ecx

        jz      .tddone

        call    usb_td_to_virt

        test    eax, eax

        jz      .tddone

        lea     edx, [eax+ohci_gtd.NextTD]

; 7c. Reverse the list, converting physical to virtual. On every iteration:

; ecx = physical address of the current item

; eax = virtual pointer to the current item

; edx = virtual pointer to the last item.NextTD (first in the reverse list)

; ebx = virtual pointer to the next item (previous in the reverse list)

.tdloop:

        mov     ecx, [eax+ohci_gtd.NextTD]

        mov     [eax+ohci_gtd.NextTD], ebx

        lea     ebx, [eax+sizeof.ohci_gtd]

        test    ecx, ecx

        jz      .tddone

        call    usb_td_to_virt

        test    eax, eax

        jnz     .tdloop

.tddone:

        mov     ecx, ebx

        pop     ebx

; 7d. The list is reversed,

; ecx = pointer to the first item, edx = pointer to the last item.NextTD.

; If the list is empty (unusual case), step 7 is done.

        test    ecx, ecx

        jz      .skip_donehead

; 7e. Otherwise, append this list to the end of previous one.

; Note that in theory the interrupt handler and the USB thread

; could execute in parallel.

.append_restart:

; Atomically get DoneListEndPtr in eax and set it to edx.

        mov     eax, [esi+ohci_controller.DoneListEndPtr-sizeof.ohci_controller]

        lock cmpxchg [esi+ohci_controller.DoneListEndPtr-sizeof.ohci_controller], edx

        jnz     .append_restart

; Store pointer to the new list.

; Note: we cannot perform any operations with [DoneListEndPtr]

; until we switch DoneListEndPtr to a new descriptor:

; it is possible that after first line of .append_restart loop

; ohci_process_deferred obtains the control, finishes processing

; of the old list, sets DoneListEndPtr to address of DoneList,

; frees all old descriptors, so eax would point to invalid location.

; This way, .append_restart loop would detect that DoneListEndPtr

; has changed, so eax needs to be re-read.

        mov     [eax], ecx

; 7f. Notify the USB thread that there is new work.

        inc     ebx

.skip_donehead:

; 8. Handle start-of-frame events.

; 8a. Test whether there are such events.

        test    byte [esp], 4

        jz      .skip_sof

; We enable SOF interrupt only when some pipes are waiting after changes.

        spin_lock_irqsave [esi+usb_controller.WaitSpinlock]

; 8b. Make sure that there was at least one frame update

; since the request. If not, wait for the next SOF.

        movzx   eax, [esi+ohci_controller.FrameNumber-sizeof.ohci_controller]

        cmp     eax, [esi+usb_controller.StartWaitFrame]

        jz      .sof_unlock

; 8c. Copy WaitPipeRequest* to ReadyPipeHead*.

        mov     eax, [esi+usb_controller.WaitPipeRequestAsync]

        mov     [esi+usb_controller.ReadyPipeHeadAsync], eax

        mov     eax, [esi+usb_controller.WaitPipeRequestPeriodic]

        mov     [esi+usb_controller.ReadyPipeHeadPeriodic], eax

; 8d. It is possible that pipe change is due to removal and

; Control/BulkCurrentED registers still point to one of pipes to be removed.

; The code responsible for disconnect events has temporarily stopped

; Control/Bulk processing, so it is safe to clear Control/BulkCurrentED.

; After that, restart processing.

        xor     edx, edx

        mov     [edi+OhciControlCurrentEDReg], edx

        mov     [edi+OhciBulkCurrentEDReg], edx

        mov     dword [edi+OhciCommandStatusReg], 6

        or      dword [edi+OhciControlReg], 30h

; 8e. Disable further interrupts on SOF.

; Note: OhciInterruptEnableReg/OhciInterruptDisableReg have unusual semantics.

        mov     dword [edi+OhciInterruptDisableReg], 4

; Notify the USB thread that there is new work (with pipes from ReadyPipeHead*).

        inc     ebx

.sof_unlock:

        spin_unlock_irqrestore [esi+usb_controller.RemoveSpinlock]

.skip_sof:

; Handle roothub events.

; 9. Test whether there are such events.

        test    byte [esp], 40h

        jz      .skip_roothub

; 10. Check the status of the roothub itself.

; 10a. Global overcurrent?

        test    dword [edi+OhciRhStatusReg], 2

        jz      @f

; Note: this needs work.

        dbgstr 'global overcurrent'

@@:

; 10b. Clear roothub events.

        mov     dword [edi+OhciRhStatusReg], 80020000h

; 11. Check the status of individual ports.

; Look for connect/disconnect and reset events.

; 11a. Prepare for the loop: start from port 0.

        xor     ecx, ecx

.portloop:

; 11b. Get the port status and changes of it.

; Accumulate change information.

; Look to "11.12.3 Port Change Information Processing" of the USB2 spec.

        xor     eax, eax

.accloop:

        mov     edx, [edi+OhciRhPortStatusReg+ecx*4]

        xor     ax, ax

        or      eax, edx

        test    edx, 1F0000h

        jz      .accdone

        mov     dword [edi+OhciRhPortStatusReg+ecx*4], 1F0000h

        jmp     .accloop

.accdone:

; debugging output, not needed for work

;       test    eax, 1F0000h

;       jz      @f

;       DEBUGF 1,'K : ohci irq [%d] status of port %d is %x\n',[timer_ticks],ecx,eax

;@@:

; 11c. Ignore any events until all ports are powered up.

; They will be processed by ohci_init.

        cmp     [esi+ohci_controller.PoweredUp-sizeof.ohci_controller], 0

        jz      .nextport

; Handle changing of connection status.

        test    eax, 10000h

        jz      .nocsc

; There was a connect or disconnect event at this port.

; 11d. Disconnect the old device on this port, if any.

; if the port was resetting, indicate fail and signal

        cmp     cl, [esi+usb_controller.ResettingPort]

        jnz     @f

        mov     [esi+usb_controller.ResettingStatus], -1

        inc     ebx

@@:

        lock bts [esi+usb_controller.NewDisconnected], ecx

; notify the USB thread that new work is waiting

        inc     ebx

; 11e. Change connected status. For the connection event, also

; store the connection time; any further processing is permitted only

; after USB_CONNECT_DELAY ticks.

        test    al, 1

        jz      .disconnect

; Note: ConnectedTime must be stored before setting the 'connected' bit,

; otherwise ohci_process_deferred could use an old time.

        mov     eax, [timer_ticks]

        mov     [esi+usb_controller.ConnectedTime+ecx*4], eax

        lock bts [esi+usb_controller.NewConnected], ecx

        jmp     .nextport

.disconnect:

        lock btr [esi+usb_controller.NewConnected], ecx

        jmp     .nextport

.nocsc:

; 11f. Process 'reset done' events.

        test    eax, 100000h

        jz      .nextport

        test    al, 10h

        jnz     .nextport

        mov     edx, [timer_ticks]

        mov     [esi+usb_controller.ResetTime], edx

        mov     [esi+usb_controller.ResettingStatus], 2

        inc     ebx

.nextport:

; 11g. Continue the loop for the next port.

        inc     ecx

        cmp     ecx, [esi+usb_controller.NumPorts]

        jb      .portloop

.skip_roothub:

; 12. Restore the stack after step 6.

        pop     eax

; 13. Notify the USB thread if some deferred processing is required.

        call    usb_wakeup_if_needed

; 14. Interrupt processed; return something non-zero.

        mov     al, 1

        pop     edi esi ebx     ; restore used registers to be stdcall

        ret

endp

; This procedure is called from usb_set_address_callback

; and stores USB device address in the ohci_pipe structure.

; in: esi -> usb_controller, ebx -> usb_pipe, cl = address

proc ohci_set_device_address

        mov     byte [ebx+ohci_pipe.Flags-sizeof.ohci_pipe], cl

; Wait until the hardware will forget the old value.

        call    usb_subscribe_control

        ret

endp

; This procedure returns USB device address from the usb_pipe structure.

; in: esi -> usb_controller, ebx -> usb_pipe

; out: eax = endpoint address

proc ohci_get_device_address

        mov     eax, [ebx+ohci_pipe.Flags-sizeof.ohci_pipe]

        and     eax, 7Fh

        ret

endp

; This procedure is called from usb_set_address_callback

; if the device does not accept SET_ADDRESS command and needs

; to be disabled at the port level.

; in: esi -> usb_controller, ecx = port

proc ohci_port_disable

        mov     edx, [esi+ohci_controller.MMIOBase-sizeof.ohci_controller]

        mov     dword [edx+OhciRhPortStatusReg+ecx*4], 1

        ret

endp

; This procedure is called from usb_get_descr8_callback when

; the packet size for zero endpoint becomes known and

; stores the packet size in ohci_pipe structure.

; in: esi -> usb_controller, ebx -> usb_pipe, ecx = packet size

proc ohci_set_endpoint_packet_size

        mov     byte [ebx+ohci_pipe.Flags+2-sizeof.ohci_pipe], cl

; Wait until the hardware will forget the old value.

        call    usb_subscribe_control

        ret

endp

; This procedure is called from API usb_open_pipe and processes

; the controller-specific part of this API. See docs.

; 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

proc ohci_init_pipe

virtual at ebp+8

.config_pipe    dd      ?

.endpoint       dd      ?

.maxpacket      dd      ?

.type           dd      ?

.interval       dd      ?

end virtual

; 1. Initialize the queue of transfer descriptors: empty.

        sub     eax, sizeof.ohci_gtd

        call    get_phys_addr

        mov     [edi+ohci_pipe.TailP-sizeof.ohci_pipe], eax

        mov     [edi+ohci_pipe.HeadP-sizeof.ohci_pipe], eax

; 2. Generate ohci_pipe.Flags, see the description in ohci_pipe.

        mov     eax, [ecx+ohci_pipe.Flags-sizeof.ohci_pipe]

        and     eax, 0x207F     ; keep Speed bit and FunctionAddress

        mov     edx, [.endpoint]

        and     edx, 15

        shl     edx, 7

        or      eax, edx

        mov     [edi+ohci_pipe.Flags-sizeof.ohci_pipe], eax

        mov     eax, [.maxpacket]

        mov     word [edi+ohci_pipe.Flags+2-sizeof.ohci_pipe], ax

        cmp     [.type], CONTROL_PIPE

        jz      @f

        test    byte [.endpoint], 80h

        setnz   al

        inc     eax

        shl     al, 3

        or      byte [edi+ohci_pipe.Flags+1-sizeof.ohci_pipe], al

@@:

; 3. Insert the new pipe to the corresponding list of endpoints.

; 3a. Use Control list for control pipes, Bulk list for bulk pipes.

        lea     edx, [esi+ohci_controller.ControlED.SoftwarePart-sizeof.ohci_controller]

        cmp     [.type], BULK_PIPE

        jb      .insert ; control pipe

        lea     edx, [esi+ohci_controller.BulkED.SoftwarePart-sizeof.ohci_controller]

        jz      .insert ; bulk pipe

.interrupt_pipe:

; 3b. For interrupt pipes, let the scheduler select the appropriate list

; based on the current bandwidth distribution and the requested bandwidth.

; This could fail if the requested bandwidth is not available;

; if so, return an error.

        lea     edx, [esi + ohci_controller.IntEDs - sizeof.ohci_controller]

        lea     eax, [esi + ohci_controller.IntEDs + 32*sizeof.ohci_static_ep - sizeof.ohci_controller]

        movi    ecx, 64

        call    usb1_select_interrupt_list

        test    edx, edx

        jz      .return0

; 3c. Insert endpoint at edi to the head of list in edx.

; Inserting to tail would work as well,

; but let's be consistent with other controllers.

.insert:

        mov     ecx, [edx+usb_pipe.NextVirt]

        mov     [edi+usb_pipe.NextVirt], ecx

        mov     [edi+usb_pipe.PrevVirt], edx

        mov     [ecx+usb_pipe.PrevVirt], edi

        mov     [edx+usb_pipe.NextVirt], edi

        mov     ecx, [edx+ohci_pipe.NextED-sizeof.ohci_pipe]

        mov     [edi+ohci_pipe.NextED-sizeof.ohci_pipe], ecx

        lea     eax, [edi-sizeof.ohci_pipe]

        call    get_phys_addr

        mov     [edx+ohci_pipe.NextED-sizeof.ohci_pipe], eax

; 4. Return something non-zero.

        ret

.return0:

        xor     eax, eax

        ret

endp

; This function is called from ohci_process_deferred when

; a new device was connected at least USB_CONNECT_DELAY ticks

; and therefore is ready to be configured.

; ecx = port, esi -> usb_controller

proc ohci_new_port

; test whether we are configuring another port

; if so, postpone configuring and return

        bts     [esi+usb_controller.PendingPorts], ecx

        cmp     [esi+usb_controller.ResettingPort], -1

        jnz     .nothing

        btr     [esi+usb_controller.PendingPorts], ecx

; fall through to ohci_new_port.reset

; This function is called from usb_test_pending_port.

; It starts reset signalling for the port. Note that in USB first stages

; of configuration can not be done for several ports in parallel.

.reset:

; reset port

        and     [esi+usb_controller.ResettingHub], 0

        mov     [esi+usb_controller.ResettingPort], cl

; Note: setting status must be the last action:

; it is possible that the device has been disconnected

; after timeout of USB_CONNECT_DELAY but before call to ohci_new_port.

; In this case, ohci_irq would not set reset status to 'failed',

; because ohci_irq would not know that this port is to be reset.

; However, the hardware would generate another interrupt

; in a response to reset a disconnected port, and this time

; ohci_irq knows that it needs to generate 'reset failed' event

; (because ResettingPort is now filled).

        push    edi

        mov     edi, [esi+ohci_controller.MMIOBase-sizeof.ohci_controller]

        mov     dword [edi+OhciRhPortStatusReg+ecx*4], 10h

        pop     edi

.nothing:

        ret

endp

; This procedure is called from the several places in main USB code

; and allocates required packets for the given transfer.

; ebx = 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

proc ohci_alloc_transfer stdcall uses edi, \

        buffer:dword, size:dword, flags:dword, td:dword, direction:dword

locals

origTD          dd      ?

packetSize      dd      ?       ; must be the last variable, see usb_init_transfer

endl

; 1. Save original value of td:

; it will be useful for rollback if something would fail.

        mov     eax, [td]

        mov     [origTD], eax

; One transfer descriptor can describe up to two pages.

; In the worst case (when the buffer is something*1000h+0FFFh)

; this corresponds to 1001h bytes. If the requested size is

; greater, we should split the transfer into several descriptors.

; Boundaries to split must be multiples of endpoint transfer size

; to avoid short packets except in the end of the transfer.

        cmp     [size], 1001h

        jbe     .lastpacket

; 2. While the remaining data cannot fit in one packet,

; allocate full-sized descriptors.

; 2a. Calculate size of one descriptor: must be a multiple of transfer size

; and must be not greater than 1001h.

        movzx   ecx, word [ebx+ohci_pipe.Flags+2-sizeof.ohci_pipe]

        mov     eax, 1001h

        xor     edx, edx

        mov     edi, eax

        div     ecx

        sub     edi, edx

; 2b. Allocate in loop.

        mov     [packetSize], edi

.fullpackets:

        call    ohci_alloc_packet

        test    eax, eax

        jz      .fail

        mov     [td], eax

        add     [buffer], edi

        sub     [size], edi

        cmp     [size], 1001h

        ja      .fullpackets

; 3. The remaining data can fit in one descriptor;

; allocate the last descriptor with size = size of remaining data.

.lastpacket:

        mov     eax, [size]

        mov     [packetSize], eax

        call    ohci_alloc_packet

        test    eax, eax

        jz      .fail

; 4. Enable an immediate interrupt on completion of the last packet.

        and     byte [ecx+ohci_gtd.Flags+2-sizeof.ohci_gtd], not (7 shl (21-16))

; 5. If a short transfer is ok for a caller, set the corresponding bit in

; the last descriptor, but not in others.

; Note: even if the caller says that short transfers are ok,

; all packets except the last one are marked as 'must be complete':

; if one of them will be short, the software intervention is needed

; to skip remaining packets; ohci_process_finalized_td will handle this

; transparently to the caller.

        test    [flags], 1

        jz      @f

        or      byte [ecx+ohci_gtd.Flags+2-sizeof.ohci_gtd], 1 shl (18-16)

@@:

        ret

.fail:

        mov     edi, ohci_hardware_func

        mov     eax, [td]

        stdcall usb_undo_tds, [origTD]

        xor     eax, eax

        ret

endp

; Helper procedure for ohci_alloc_transfer.

; Allocates and initializes one transfer descriptor.

; ebx = pipe, other parameters are passed through the stack;

; fills the current last descriptor and

; returns eax = next descriptor (not filled).

proc ohci_alloc_packet

; inherit some variables from the parent ohci_alloc_transfer

virtual at ebp-8