Subversion Repositories Kolibri OS

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;                                                                    ;;

;; Copyright (C) KolibriOS team 2004-2010. All rights reserved.       ;;

;; Distributed under terms of the GNU General Public License          ;;

;;                                                                    ;;

;;  Ethernet driver for KolibriOS                                     ;;

;;  This is an adaptation of MenuetOS driver with minimal changes.    ;;

;;  Changes were made by CleverMouse. Original copyright follows.     ;;

;;                                                                    ;;

;;  This driver is based on the SIS900 driver from                    ;;

;;  the etherboot 5.0.6 project. The copyright statement is           ;;

;;                                                                    ;;

;;          GNU GENERAL PUBLIC LICENSE                                ;;

;;             Version 2, June 1991                                   ;;

;;                                                                    ;;

;;  remaining parts Copyright 2004 Jason Delozier,                    ;;

;;   cordata51@hotmail.com                                            ;;

;;                                                                    ;;

;;  See file COPYING for details                                      ;;

;;                                                                    ;;

;;  Updates:                                                          ;;

;;    Revision Look up table and SIS635 Mac Address by Jarek Pelczar  ;;

;;                                                                    ;;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

format MS COFF

        API_VERSION             =   0x01000100

        DRIVER_VERSION          =   5

        MAX_DEVICES             =   16

        DEBUG                   =   1

        __DEBUG__               =   1

        __DEBUG_LEVEL__         =   1

include 'proc32.inc'

include 'imports.inc'

include 'fdo.inc'

include 'netdrv.inc'

public START

public version

NUM_RX_DESC             =   4           ;* Number of RX descriptors *

NUM_TX_DESC             =   1           ;* Number of TX descriptors *

RX_BUFF_SZ              =   1520        ;* Buffer size for each Rx buffer *

TX_BUFF_SZ              =   1516        ;* Buffer size for each Tx buffer *

MAX_ETH_FRAME_SIZE      =   1516

virtual at ebx

        device:

        ETH_DEVICE

        .io_addr        dd ?

        .pci_bus        db ?

        .pci_dev        db ?

        .irq_line       db ?

        .cur_rx         db ?

        .cur_tx         db ?

        .last_tx        db ?

        .pci_revision   db ?

        .table_entries  db ?

                        dw ? ; align 4

        .special_func   dd ?

        .txd            rd (4 * NUM_TX_DESC)

        .rxd            rd (4 * NUM_RX_DESC)

        .size = $ - device

end virtual

macro   ee_delay {

        push    eax

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        pop     eax

}

section '.flat' code readable align 16

; Driver entry point - register our service when the driver is loading.

; TODO: add needed operations when unloading

START:

        cmp     dword [esp+4], 1

        jne     .exit

        stdcall RegService, my_service, service_proc

        ret     4

.exit:

        xor     eax, eax

        ret     4

; Service procedure for the driver - handle all I/O requests for the driver.

; Currently handled requests are: SRV_GETVERSION = 0 and SRV_HOOK = 1.

service_proc:

; 1. Get parameter from the stack: [esp+4] is the first parameter,

;       pointer to IOCTL structure.

        mov     edx, [esp+4]    ; edx -> IOCTL

; 2. Get request code and select a handler for the code.

        mov     eax, [IOCTL.io_code]

        test    eax, eax        ; check for SRV_GETVERSION

        jnz     @f

; 3. This is SRV_GETVERSION request, no input, 4 bytes output, API_VERSION.

; 3a. Output size must be at least 4 bytes.

        cmp     [IOCTL.out_size], 4

        jl      .fail

; 3b. Write result to the output buffer.

        mov     eax, [IOCTL.output]

        mov     [eax], dword API_VERSION

; 3c. Return success.

        xor     eax, eax

        ret     4

@@:

        dec     eax     ; check for SRV_HOOK

        jnz     .fail

; 4. This is SRV_HOOK request, input defines the device to hook, no output.

; 4a. The driver works only with PCI devices,

;       so input must be at least 3 bytes long.

        cmp     [IOCTL.inp_size], 3

        jl      .fail

; 4b. First byte of input is bus type, 1 stands for PCI.

        mov     eax, [IOCTL.input]

        cmp     byte [eax], 1

        jne     .fail

; 4c. Second and third bytes of the input define the device: bus and dev.

;       Word in bx holds both bytes.

        mov     bx, [eax+1]

; 4d. Check if the device was already hooked,

;       scan through the list of known devices.

; check if the device is already listed

        mov     esi, device_list

        mov     ecx, [devices]

        test    ecx, ecx

        jz      .firstdevice

;        mov     eax, [IOCTL.input]                      ; get the pci bus and device numbers

        mov     ax , [eax+1]                            ;

  .nextdevice:

        mov     ebx, [esi]

        cmp     ax , word [device.pci_bus]              ; compare with pci and device num in device list (notice the usage of word instead of byte)

        je      .find_devicenum                         ; Device is already loaded, let's find it's device number

        add     esi, 4

        loop    .nextdevice

; 4e. This device doesn't have its own eth_device structure yet, let's create one

  .firstdevice:

; 4f. Check that we have place for new device.

        cmp     [devices], MAX_DEVICES

        jge     .fail

; 4g. Allocate memory for device descriptor and receive+transmit buffers.

        stdcall KernelAlloc, device.size

        test    eax, eax

        jz      .fail

; 4h. Zero the structure.

        mov     edi, eax

        mov     ecx, (device.size + 3) shr 2

        xor     eax, eax

        rep     stosd

; 4i. Save PCI coordinates

        mov     eax, [IOCTL.input]

        mov     cl , [eax+1]

        mov     [device.pci_bus], cl

        mov     cl , [eax+2]

        mov     [device.pci_dev], cl

; 4j. Fill in the direct call addresses into the struct.

; Note that get_MAC pointer is filled in initialization by probe.

        mov     [device.reset], init

        mov     [device.transmit], transmit

;       mov     [device.get_MAC], read_mac

        mov     [device.set_MAC], write_mac

        mov     [device.unload], unload

        mov     [device.name], my_service

; 4k. Now, it's time to find the base io addres of the PCI device

; TODO: implement check if bus and dev exist on this machine

; Now, it's time to find the base io addres of the PCI device

        find_io [device.pci_bus], [device.pci_dev], [device.io_addr]

; We've found the io address, find IRQ now

        find_irq [device.pci_bus], [device.pci_dev], [device.irq_line]

; 4m. Add new device to the list (required for int_handler).

        mov     eax, [devices]

        mov     [device_list+4*eax], ebx

        inc     [devices]

; 4m. Ok, the eth_device structure is ready, let's probe the device

        call    probe

        test    eax, eax

        jnz     .destroy

; 4n. If device was successfully initialized, register it for the kernel.

        mov     [device.type], NET_TYPE_ETH

        call    NetRegDev

        cmp     eax, -1

        je      .destroy

        ret     4

; 5. If the device was already loaded, find the device number and return it in eax

  .find_devicenum:

        call    NetPtrToNum                                             ; This kernel procedure converts a pointer to device struct in ebx

                                                                        ; into a device number in edi

        mov     eax, edi                                                ; Application wants it in eax instead

        ret     4

; If an error occured, remove all allocated data and exit (returning -1 in eax)

  .destroy:

        dec     [devices]

        ; todo: reset device into virgin state

  .err:

        stdcall KernelFree, ebx

  .fail:

        xor     eax, eax

        ret     4

;;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\;;

;;                                                                        ;;

;;        Actual Hardware dependent code starts here                      ;;

;;                                                                        ;;

;;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\;;

unload:

        ; TODO: (in this particular order)

        ;

        ; - Stop the device

        ; - Detach int handler

        ; - Remove device from local list

        ; - call unregister function in kernel

        ; - Remove all allocated structures and buffers the card used

        or      eax,-1

ret

;********************************************************************

;  Comments:

;    Known to work with the following SIS900 ethernet cards:

;      -  Device ID: 0x0900   Vendor ID: 0x1039   Revision: 0x91

;      -  Device ID: 0x0900   Vendor ID: 0x1039   Revision: 0x90

;

;    If your card is not listed, try it and let me know if it

;    functions properly and it will be aded to the list.  If not

;    we may be able to add support for it.

;

;  ToDo:

;     -  Enable MII interface for reading speed

;        and duplex settings.

;     -  Update receive routine to support packet fragmentation.

;     -  Add additional support for other sis900 based cards

;

;********************************************************************

        ETH_ALEN        =   6           ; Size of Ethernet address

        ETH_HLEN        =   14          ; Size of ethernet header

        ETH_ZLEN        =   60          ; Minimum packet length

        DSIZE           =   0x00000fff

        CRC_SIZE        =   4

        RFADDR_shift    =   16

; Symbolic offsets to registers.

        cr              =   0x0               ; Command Register

        cfg             =   0x4       ; Configuration Register

        mear            =   0x8       ; EEPROM Access Register

        ptscr           =   0xc       ; PCI Test Control Register

        isr             =   0x10      ; Interrupt Status Register

        imr             =   0x14      ; Interrupt Mask Register

        ier             =   0x18      ; Interrupt Enable Register

        epar            =   0x18      ; Enhanced PHY Access Register

        txdp            =   0x20      ; Transmit Descriptor Pointer Register

        txcfg           =   0x24      ; Transmit Configuration Register

        rxdp            =   0x30      ; Receive Descriptor Pointer Register

        rxcfg           =   0x34      ; Receive Configuration Register

        flctrl          =   0x38      ; Flow Control Register

        rxlen           =   0x3c      ; Receive Packet Length Register

        rfcr            =   0x48      ; Receive Filter Control Register

        rfdr            =   0x4C      ; Receive Filter Data Register

        pmctrl          =   0xB0      ; Power Management Control Register

        pmer            =   0xB4      ; Power Management Wake-up Event Register

; Command Register Bits

        RELOAD          =   0x00000400

        ACCESSMODE      =   0x00000200

        RESET           =   0x00000100

        SWI             =   0x00000080

        RxRESET         =   0x00000020

        TxRESET         =   0x00000010

        RxDIS           =   0x00000008

        RxENA           =   0x00000004

        TxDIS           =   0x00000002

        TxENA           =   0x00000001

; Configuration Register Bits

        DESCRFMT        =   0x00000100 ; 7016 specific

        REQALG          =   0x00000080

        SB              =   0x00000040

        POW             =   0x00000020

        EXD             =   0x00000010

        PESEL           =   0x00000008

        LPM             =   0x00000004

        BEM             =   0x00000001

        RND_CNT         =   0x00000400

        FAIR_BACKOFF    =   0x00000200

        EDB_MASTER_EN   =   0x00002000

; Eeprom Access Reigster Bits

        MDC             =   0x00000040

        MDDIR           =   0x00000020

        MDIO            =   0x00000010  ; 7016 specific

        EECS            =   0x00000008

        EECLK           =   0x00000004

        EEDO            =   0x00000002

        EEDI            =   0x00000001

; TX Configuration Register Bits

        ATP             =   0x10000000 ;Automatic Transmit Padding

        MLB             =   0x20000000 ;Mac Loopback Enable

        HBI             =   0x40000000 ;HeartBeat Ignore (Req for full-dup)

        CSI             =   0x80000000 ;CarrierSenseIgnore (Req for full-du

; RX Configuration Register Bits

        AJAB            =   0x08000000 ;

        ATX             =   0x10000000 ;Accept Transmit Packets

        ARP             =   0x40000000 ;accept runt packets (<64bytes)

        AEP             =   0x80000000 ;accept error packets

; Interrupt Reigster Bits

        WKEVT           =   0x10000000

        TxPAUSEEND      =   0x08000000

        TxPAUSE         =   0x04000000

        TxRCMP          =   0x02000000

        RxRCMP          =   0x01000000

        DPERR           =   0x00800000

        SSERR           =   0x00400000

        RMABT           =   0x00200000

        RTABT           =   0x00100000

        RxSOVR          =   0x00010000

        HIBERR          =   0x00008000

        SWINT           =   0x00001000

        MIBINT          =   0x00000800

        TxURN           =   0x00000400

        TxIDLE          =   0x00000200

        TxERR           =   0x00000100

        TxDESC          =   0x00000080

        TxOK            =   0x00000040

        RxORN           =   0x00000020

        RxIDLE          =   0x00000010

        RxEARLY         =   0x00000008

        RxERR           =   0x00000004

        RxDESC          =   0x00000002

        RxOK            =   0x00000001

; Interrupt Enable Register Bits

        IE              =   RxOK + TxOK

; Revision ID

        SIS900B_900_REV         =   0x03

        SIS630A_900_REV         =   0x80

        SIS630E_900_REV         =   0x81

        SIS630S_900_REV         =   0x82

        SIS630EA1_900_REV       =   0x83

        SIS630ET_900_REV        =   0x84

        SIS635A_900_REV         =   0x90

        SIS900_960_REV          =   0x91

; Receive Filter Control Register Bits

        RFEN            =   0x80000000

        RFAAB           =   0x40000000

        RFAAM           =   0x20000000

        RFAAP           =   0x10000000

        RFPromiscuous   =   0x70000000

; Reveive Filter Data Mask

        RFDAT           =   0x0000FFFF

; Eeprom Address

        EEPROMSignature =   0x00

        EEPROMVendorID  =   0x02

        EEPROMDeviceID  =   0x03

        EEPROMMACAddr   =   0x08

        EEPROMChecksum  =   0x0b

;The EEPROM commands include the alway-set leading bit.

        EEread          =   0x0180

        EEwrite         =   0x0140

        EEerase         =   0x01C0

        EEwriteEnable   =   0x0130

        EEwriteDisable  =   0x0100

        EEeraseAll      =   0x0120

        EEwriteAll      =   0x0110

        EEaddrMask      =   0x013F

        EEcmdShift      =   16

;For SiS962 or SiS963, request the eeprom software access

        EEREQ           =   0x00000400

        EEDONE          =   0x00000200

        EEGNT           =   0x00000100

;***************************************************************************

;

; probe

;

; Searches for an ethernet card, enables it and clears the rx buffer

;

; TODO: probe mii transceivers

;

;***************************************************************************

align 4

probe:

        movzx   eax, [device.pci_bus]

        movzx   edx, [device.pci_dev]

        stdcall PciWrite8, eax, edx, 0x40, 0    ; Wake Up Chip

        make_bus_master [device.pci_bus], [device.pci_dev]

; Get Card Revision

        movzx   eax, [device.pci_bus]

        movzx   edx, [device.pci_dev]

        stdcall PciRead8, eax, edx, 0x08

        mov     [device.pci_revision], al       ; save the revision for later use

; Look up through the specific_table

        mov     esi, specific_table

  .loop:

        cmp     dword [esi], 0                  ; Check if we reached end of the list

        je      .error

        cmp     al, [esi]                       ; Check if revision is OK

        je      .ok

        add     esi, 12                         ; Advance to next entry

        jmp     .loop

  .error:

        DEBUGF  1, "Device not supported!\n"

        or      eax, -1

        ret

; Find Get Mac Function

  .ok:

        mov     eax, [esi+4]            ; Get pointer to "get MAC" function

        mov     [device.get_MAC], eax

        mov     eax, [esi+8]            ; Get pointer to special initialization fn

        mov     [device.special_func], eax

; Get MAC

        call    [device.get_MAC]

; Call special initialization fn if requested

        cmp     [device.special_func],0

        je      @f

        call    [device.special_func]

       @@:

; Set table entries

        mov      [device.table_entries], 16

        cmp      [device.pci_revision], SIS635A_900_REV

        jae      @f

        cmp      [device.pci_revision], SIS900B_900_REV

        je       @f

        mov      [device.table_entries], 8

       @@:

; TODO: Probe for mii transceiver

;***************************************************************************

;

; init

;

; resets the ethernet controller chip and various

;    data structures required for sending and receiving packets.

;

;***************************************************************************

align 4

init:

        call reset

        call init_rxfilter

        call init_txd

        call init_rxd

        call set_rx_mode

        call set_tx_mode

        ;call check_mode

; enable interrupts on packet receive

        xor     eax, eax

        inc     eax     ; eax = 1 = RxOK

        set_io  0

        set_io  imr

        out     dx, eax

; globally enable interrupts

        set_io  ier

        out     dx, eax ; eax is still 1

        xor     eax, eax

        mov     [device.mtu], 1514

        ret

;***************************************************************************

;

; reset

;

; disables interrupts and soft resets the controller chip

;

;***************************************************************************

align 4

reset:

        movzx   eax, [device.irq_line]

        stdcall AttachIntHandler, eax, int_handler, 0

;--------------------------------------------

; Disable Interrupts and reset Receive Filter

        set_io  0

        set_io  ier

        xor     eax, eax

        out     dx, eax

        set_io  imr

        out     dx, eax

        set_io  rfcr

        out     dx, eax

;-----------

; Reset Card

        set_io  cr

        in      eax, dx                         ; Get current Command Register

        or      eax, RESET + RxRESET + TxRESET  ; set flags

        out     dx, eax                         ; Write new Command Register

;----------

; Wait loop

        set_io  isr

        mov     ecx, 1000

  .loop:

        dec     ecx

        jz      .error

        in      eax, dx                         ; move interrup status to eax

        cmp     eax, 0x03000000

        jne     .loop

;------------------------------------------------------

; Set Configuration Register depending on Card Revision

        set_io  cfg

        mov     eax, PESEL                      ; Configuration Register Bit

        cmp     [device.pci_revision], SIS635A_900_REV

        je      .match

        cmp     [device.pci_revision], SIS900B_900_REV ; Check card revision

        je      .match

        out     dx, eax                         ; no revision match

        jmp     .done

  .match:                                       ; Revision match

        or      eax, RND_CNT                    ; Configuration Register Bit

        out     dx, eax

  .done:

        xor     eax, eax

        ret

  .error:

        DEBUGF  1, "Reset failed!\n"

        or      eax, -1

        ret

;***************************************************************************

;

; sis_init_rxfilter

;

; sets receive filter address to our MAC address

;

;***************************************************************************

align 4

init_rxfilter:

;------------------------------------

; Get Receive Filter Control Register

        set_io  0

        set_io  rfcr

        in      eax, dx

        push    eax

;-----------------------------------------------

; disable packet filtering before setting filter

        and     eax, not RFEN

        out     dx, eax

;--------------------------------------

; load MAC addr to filter data register

        xor     ecx, ecx

RXINT_Mac_Write:        ; high word of eax tells card which mac byte to write

        mov     eax, ecx

        set_io  0

        set_io  rfcr

        shl     eax, 16                                             ;

        out     dx, eax                                             ;

        set_io  rfdr

        mov     ax, word [device.mac+ecx*2]                         ; Get Mac ID word

        out     dx, ax                                              ; Send Mac ID

        inc     cl                                                  ; send next word

        cmp     cl, 3                                               ; more to send?

        jne     RXINT_Mac_Write

;------------------------

; enable packet filtering

        pop     eax                             ;old register value

        set_io  rfcr

        or      eax, RFEN    ;enable filtering

        out     dx, eax             ;set register

        ret

;***************************************************************************

;

; init_txd

;

; initializes the Tx descriptor

;

;***************************************************************************

align 4

init_txd:

;-------------------------

; initialize TX descriptor

        mov     dword [device.txd], 0           ; put link to next descriptor in link field

        mov     dword [device.txd+4], 0         ; clear status field

        mov     dword [device.txd+8], 0         ; ptr to buffer

;----------------------------------

; load Transmit Descriptor Register

        set_io  0

        set_io  txdp                    ; TX Descriptor Pointer

        lea     eax, [device.txd]

        GetRealAddr

        out     dx, eax                             ; move the pointer

        ret

;***************************************************************************

;

; init_rxd

;

; initializes the Rx descriptor ring

;

;***************************************************************************

align 4

init_rxd:

; init RX descriptors

        mov     ecx, NUM_RX_DESC

        lea     esi, [device.rxd]

  .loop:

        lea     eax, [esi + 16]

        GetRealAddr

        mov     dword [esi+0], eax

        mov     dword [esi+4], RX_BUFF_SZ

        stdcall KernelAlloc, RX_BUFF_SZ

        test    eax, eax

        jz      .fail

        mov     dword [esi+12], eax

        GetRealAddr

        mov     dword [esi+8], eax

        add     esi, 16

        loop    .loop

        lea     eax, [device.rxd]

        GetRealAddr

        mov     dword [esi - 16], eax   ; correct last descriptor link ptr

; And output ptr to first desc, to device

        set_io  0

        set_io  rxdp

        out     dx, eax

        mov     [device.cur_rx], 0      ; Set curent rx discriptor to 0

  .fail:        ;;; TODO: abort instead!

        ret

;***************************************************************************

;

; set_tx_mode

;

; sets the transmit mode to allow for full duplex

;

; If you are having problems transmitting packet try changing the

; Max DMA Burst, Possible settings are as follows:

;

; 0x00000000 = 512 bytes

; 0x00100000 = 4 bytes

; 0x00200000 = 8 bytes

; 0x00300000 = 16 bytes

; 0x00400000 = 32 bytes

; 0x00500000 = 64 bytes

; 0x00600000 = 128 bytes

; 0x00700000 = 256 bytes

;

;***************************************************************************

align 4

set_tx_mode:

        set_io  0

        set_io  cr

        in      eax, dx                         ; Get current Command Register

        or      eax, TxENA                      ; Enable Receive

        out     dx, eax

        set_io  txcfg                                   ; Transmit config Register offset

        mov     eax, ATP + HBI + CSI +0x00600120

        ; allow automatic padding

        ; allow heartbeat ignore

        ; allow carrier sense ignore

        ; Max DMA Burst (128 bytes)

        ; TX Fill Threshold

        ; TX Drain Threshold

        out      dx, eax

        ret

;***************************************************************************

;

; set_rx_mode

;

; sets the receive mode to accept all broadcast packets and packets

; with our MAC address, and reject all multicast packets.  Also allows

; full-duplex

;

; If you are having problems receiving packet try changing the

; Max DMA Burst, Possible settings are as follows:

;

; 0x00000000 = 512 bytes

; 0x00100000 = 4 bytes

; 0x00200000 = 8 bytes

; 0x00300000 = 16 bytes

; 0x00400000 = 32 bytes

; 0x00500000 = 64 bytes

; 0x00600000 = 128 bytes

; 0x00700000 = 256 bytes

;

;***************************************************************************

align 4

set_rx_mode:

;----------------------------------------------

; update Multicast Hash Table in Receive Filter

        xor      cl, cl

  .loop:

        set_io   0

        set_io   rfcr                   ; Receive Filter Control Reg offset

        mov      eax, 4                 ; determine table entry

        add      al, cl

        shl      eax, 16

        out      dx, eax                ; tell card which entry to modify

        set_io   rfdr                   ; Receive Filter Control Reg offset

        mov      eax, 0xffff            ; entry value

        out      dx, ax                 ; write value to table in card

        inc      cl                     ; next entry

        cmp      cl, [device.table_entries]

        jl       .loop

;------------------------------------

; Set Receive Filter Control Register

        set_io  rfcr                    ; Receive Filter Control Register offset

        mov     eax, RFAAB + RFAAM + RFAAP + RFEN

        ; accecpt all broadcast packets

        ; accept all multicast packets

        ; Accept all packets

        ; enable receiver filter

        out     dx, eax

;----------------

; Enable Receiver

        set_io  cr

        in      eax, dx                 ; Get current Command Register

        or      eax, RxENA              ; Enable Receive

        out     dx, eax

;-------------------

; Configure Receiver

        set_io  rxcfg                   ; Receive Config Register offset

        mov     eax, ATX + 0x00600002

        ; Accept Transmit Packets

        ; (Req for full-duplex and PMD Loopback)

        ; Max DMA Burst

        ; RX Drain Threshold, 8X8 bytes or 64bytes

        out      dx, eax

        ret

;***************************************************************************

;

; SIS960_get_mac_addr: - Get MAC address for SiS962 or SiS963 model

;

; SiS962 or SiS963 model, use EEPROM to store MAC address.

; EEPROM is shared by LAN and 1394.

; When access EEPROM, send EEREQ signal to hardware first, and wait for EEGNT.

; If EEGNT is ON, EEPROM is permitted to be accessed by LAN, otherwise is not.

; After MAC address is read from EEPROM, send

; EEDONE signal to refuse EEPROM access by LAN.

; The EEPROM map of SiS962 or SiS963 is different to SiS900.

; The signature field in SiS962 or SiS963 spec is meaningless.

;

; Return 0 is EAX = failure

;

;***************************************************************************

align 4

SIS960_get_mac_addr:

;-------------------------------

; Send Request for eeprom access

        set_io  0

        set_io  mear            ; Eeprom access register

        mov     eax, EEREQ      ; Request access to eeprom

        out     dx, eax         ; Send request

;-----------------------------------------------------

; Loop 4000 times and if access not granted, error out

        mov     ecx, 4000

  .loop:

        in      eax, dx         ; get eeprom status

        test    eax, EEGNT      ; see if eeprom access granted flag is set

        jnz     .got_access     ; if it is, go access the eeprom

        loop    .loop           ; else keep waiting

        DEBUGF  1, "Access to EEprom failed!\n", 0

        set_io  mear            ; Eeprom access register

        mov     eax, EEDONE     ; tell eeprom we are done

        out     dx, eax

        or      eax, -1         ; error

        ret

  .got_access:

;------------------------------------------

; EEprom access granted, read MAC from card

    ; zero based so 3-16 bit reads will take place

        mov     ecx, 2

  .read_loop:

        mov     eax, EEPROMMACAddr      ; Base Mac Address

        add     eax, ecx                ; Current Mac Byte Offset

        push    ecx

        call    read_eeprom             ; try to read 16 bits

        pop     ecx

        mov     word [device.mac+ecx*2], ax     ; save 16 bits to the MAC ID varible

        dec     ecx                     ; one less word to read

        jns     .read_loop              ; if more read more

        mov     eax, 1                  ; return non-zero indicating success

        DEBUGF  2,"%x-%x-%x-%x-%x-%x\n",[device.mac]:2,[device.mac+1]:2,[device.mac+2]:2,[device.mac+3]:2,[device.mac+4]:2,[device.mac+5]:2

;-------------------------------------

; Tell EEPROM We are Done Accessing It

  .done:

        set_io  0

        set_io  mear            ; Eeprom access register

        mov     eax, EEDONE     ; tell eeprom we are done

        out     dx, eax

        xor     eax, eax        ; ok

        ret

;***************************************************************************

;

; get_mac_addr: - Get MAC address for stand alone SiS900 model

;

; Older SiS900 and friends, use EEPROM to store MAC address.

;

;***************************************************************************

align 4

SIS900_get_mac_addr:

;------------------------------------

; check to see if we have sane EEPROM

        mov     eax, EEPROMSignature  ; Base Eeprom Signature

        call    read_eeprom           ; try to read 16 bits

        cmp     ax, 0xffff

        je      .err

        test    ax, ax

        je      .err

;-----------

; Read MacID

; zero based so 3-16 bit reads will take place

        mov     ecx, 2

  .loop:

        mov     eax, EEPROMMACAddr      ; Base Mac Address

        add     eax, ecx                ; Current Mac Byte Offset

        push    ecx

        call    read_eeprom             ; try to read 16 bits

        pop     ecx

        mov     word [device.mac+ecx*2], ax     ; save 16 bits to the MAC ID storage

        dec     ecx                             ; one less word to read

        jns     .loop                           ; if more read more

        DEBUGF  2,"%x-%x-%x-%x-%x-%x\n",[device.mac]:2,[device.mac+1]:2,[device.mac+2]:2,[device.mac+3]:2,[device.mac+4]:2,[device.mac+5]:2

        xor     eax, eax

        ret

  .err:

        DEBUGF  1, "Access to EEprom failed!\n", 0

        or      eax, -1

        ret

;***************************************************************************

;

; Get_Mac_SIS635_900_REV: - Get MAC address for model 635

;

;***************************************************************************

align 4

Get_Mac_SIS635_900_REV:

        set_io  0

        set_io  rfcr

        in      eax, dx

        mov     edi, eax ; EDI=rfcrSave

        set_io  cr

        or      eax, RELOAD

        out     dx, eax

        xor     eax, eax

        out     dx, eax

;-----------------------------------------------

; Disable packet filtering before setting filter

        set_io  rfcr

        mov     eax, edi

        and     edi, not RFEN

        out     dx, eax

;---------------------------------

; Load MAC to filter data register

        mov     ecx, 3

        lea     edi, [device.mac]

  .loop:

        set_io  0

        set_io  rfcr

        mov     eax, ecx

        shl     eax, RFADDR_shift

        out     dx, eax

        set_io  rfdr

        in      eax, dx

        stosw

        loop    .loop

;------------------------

; Enable packet filtering

;        set_io  rfcr

;        mov     eax, edi

;        or      eax, RFEN

;        out     dx, eax

        xor     eax, eax

        ret

;***************************************************************************

;

; read_eeprom

;

; reads and returns a given location from EEPROM

;

; IN:  si = addr

; OUT: ax = data

;

;***************************************************************************

align 4

read_eeprom:

        set_io  0

        set_io  mear

        xor     eax, eax              ; start send

        out     dx, eax

        ee_delay

        or      eax, EECLK

        out     dx, eax

        ee_delay

;------------------------------------

; Send the read command

        or      esi, EEread

        mov     ecx, 1 shl 9

  .loop:

        mov     eax, EECS

        test    esi, ecx

        jz      @f

        or      eax, EEDI

       @@:

        out     dx, eax

        ee_delay

        or      eax, EECLK

        out     dx, eax

        ee_delay

        shr     esi, 1

        jnc     .loop

        mov     eax, EECS

        out     dx, eax

        ee_delay