Subversion Repositories Kolibri OS

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;;                                                                 ;;

;; Copyright (C) KolibriOS team 2004-2011. All rights reserved.    ;;

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

;;                                                                 ;;

;;  R6040 driver for KolibriOS                                     ;;

;;                                                                 ;;

;;  based on R6040.c from linux                                    ;;

;;                                                                 ;;

;;    Written by Asper (asper.85@mail.ru)                          ;;

;;            and hidnplayr (hidnplayr@gmail.com)                  ;;

;;                                                                 ;;

;;          GNU GENERAL PUBLIC LICENSE                             ;;

;;             Version 2, June 1991                                ;;

;;                                                                 ;;

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

format MS COFF

        API_VERSION             =   0x01000100

        DRIVER_VERSION          =   5

        MAX_DEVICES             =   16

        DEBUG                   =   1

        __DEBUG__               =   1

        __DEBUG_LEVEL__         =   2

        W_MAX_TIMEOUT           =   0x0FFF      ; max time out delay time

        TX_TIMEOUT              =   6000        ; Time before concluding the transmitter is hung, in ms

        TX_RING_SIZE            =   4           ; RING sizes must be a power of 2

        RX_RING_SIZE            =   4

        RX_BUF_LEN_IDX          =   3           ; 0==8K, 1==16K, 2==32K, 3==64K

; Threshold is bytes transferred to chip before transmission starts.

        TX_FIFO_THRESH          =   256         ; In bytes, rounded down to 32 byte units.

; The following settings are log_2(bytes)-4:  0 == 16 bytes .. 6==1024.

        RX_FIFO_THRESH          =   4           ; Rx buffer level before first PCI xfer.

        RX_DMA_BURST            =   4           ; Maximum PCI burst, '4' is 256 bytes

        TX_DMA_BURST            =   4

include 'proc32.inc'

include 'imports.inc'

include 'fdo.inc'

include 'netdrv.inc'

public START

public service_proc

public version

; Operational parameters that usually are not changed.

PHY1_ADDR       =   1       ;For MAC1

PHY2_ADDR       =   3       ;For MAC2

PHY_MODE        =   0x3100  ;PHY CHIP Register 0

PHY_CAP         =   0x01E1  ;PHY CHIP Register 4

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

; RDC R6040 Register Definitions

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

MCR0            =   0x00    ;Control register 0

MCR1            =   0x01    ;Control register 1

MAC_RST         =   0x0001  ;Reset the MAC

MBCR            =   0x08    ;Bus control

MT_ICR          =   0x0C    ;TX interrupt control

MR_ICR          =   0x10    ;RX interrupt control

MTPR            =   0x14    ;TX poll command register

MR_BSR          =   0x18    ;RX buffer size

MR_DCR          =   0x1A    ;RX descriptor control

MLSR            =   0x1C    ;Last status

MMDIO           =   0x20    ;MDIO control register

MDIO_WRITE      =   0x4000  ;MDIO write

MDIO_READ       =   0x2000  ;MDIO read

MMRD            =   0x24    ;MDIO read data register

MMWD            =   0x28    ;MDIO write data register

MTD_SA0         =   0x2C    ;TX descriptor start address 0

MTD_SA1         =   0x30    ;TX descriptor start address 1

MRD_SA0         =   0x34    ;RX descriptor start address 0

MRD_SA1         =   0x38    ;RX descriptor start address 1

MISR            =   0x3C    ;Status register

MIER            =   0x40    ;INT enable register

MSK_INT         =   0x0000  ;Mask off interrupts

RX_FINISH       =   0x0001  ;RX finished

RX_NO_DESC      =   0x0002  ;No RX descriptor available

RX_FIFO_FULL    =   0x0004  ;RX FIFO full

RX_EARLY        =   0x0008  ;RX early

TX_FINISH       =   0x0010  ;TX finished

TX_EARLY        =   0x0080  ;TX early

EVENT_OVRFL     =   0x0100  ;Event counter overflow

LINK_CHANGED    =   0x0200  ;PHY link changed

ME_CISR         =   0x44    ;Event counter INT status

ME_CIER         =   0x48    ;Event counter INT enable

MR_CNT          =   0x50    ;Successfully received packet counter

ME_CNT0         =   0x52    ;Event counter 0

ME_CNT1         =   0x54    ;Event counter 1

ME_CNT2         =   0x56    ;Event counter 2

ME_CNT3         =   0x58    ;Event counter 3

MT_CNT          =   0x5A    ;Successfully transmit packet counter

ME_CNT4         =   0x5C    ;Event counter 4

MP_CNT          =   0x5E    ;Pause frame counter register

MAR0            =   0x60    ;Hash table 0

MAR1            =   0x62    ;Hash table 1

MAR2            =   0x64    ;Hash table 2

MAR3            =   0x66    ;Hash table 3

MID_0L          =   0x68    ;Multicast address MID0 Low

MID_0M          =   0x6A    ;Multicast address MID0 Medium

MID_0H          =   0x6C    ;Multicast address MID0 High

MID_1L          =   0x70    ;MID1 Low

MID_1M          =   0x72    ;MID1 Medium

MID_1H          =   0x74    ;MID1 High

MID_2L          =   0x78    ;MID2 Low

MID_2M          =   0x7A    ;MID2 Medium

MID_2H          =   0x7C    ;MID2 High

MID_3L          =   0x80    ;MID3 Low

MID_3M          =   0x82    ;MID3 Medium

MID_3H          =   0x84    ;MID3 High

PHY_CC          =   0x88    ;PHY status change configuration register

PHY_ST          =   0x8A    ;PHY status register

MAC_SM          =   0xAC    ;MAC status machine

MAC_ID          =   0xBE    ;Identifier register

MAX_BUF_SIZE    =   0x600   ;1536

MBCR_DEFAULT    =   0x012A  ;MAC Bus Control Register

MCAST_MAX       =   3       ;Max number multicast addresses to filter

;Descriptor status

DSC_OWNER_MAC   =   0x8000  ;MAC is the owner of this descriptor

DSC_RX_OK       =   0x4000  ;RX was successfull

DSC_RX_ERR      =   0x0800  ;RX PHY error

DSC_RX_ERR_DRI  =   0x0400  ;RX dribble packet

DSC_RX_ERR_BUF  =   0x0200  ;RX length exceeds buffer size

DSC_RX_ERR_LONG =   0x0100  ;RX length > maximum packet length

DSC_RX_ERR_RUNT =   0x0080  ;RX packet length < 64 byte

DSC_RX_ERR_CRC  =   0x0040  ;RX CRC error

DSC_RX_BCAST    =   0x0020  ;RX broadcast (no error)

DSC_RX_MCAST    =   0x0010  ;RX multicast (no error)

DSC_RX_MCH_HIT  =   0x0008  ;RX multicast hit in hash table (no error)

DSC_RX_MIDH_HIT =   0x0004  ;RX MID table hit (no error)

DSC_RX_IDX_MID_MASK  =   3  ;RX mask for the index of matched MIDx

;PHY settings

ICPLUS_PHY_ID   =   0x0243

RX_INTS         =   RX_FIFO_FULL or RX_NO_DESC or RX_FINISH

TX_INTS         =   TX_FINISH

INT_MASK        =   RX_INTS or TX_INTS

RX_BUF_LEN      equ (8192 << RX_BUF_LEN_IDX)    ; Size of the in-memory receive ring.

IO_SIZE         =   256     ; RDC MAC I/O Size

MAX_MAC         =   2       ; MAX RDC MAC

virtual at 0

x_head:

  .status         dw ?   ;0-1

  .len            dw ?   ;2-3

  .buf            dd ?   ;4-7

  .ndesc          dd ?   ;8-B

  .rev1           dd ?   ;C-F

  .vbufp          dd ?   ;10-13

  .vndescp        dd ?   ;14-17

  .skb_ptr        dd ?   ;18-1B

  .rev2           dd ?   ;1C-1F

  .sizeof:

end virtual

virtual at ebx

        device:

        ETH_DEVICE

        .io_addr        dd ?

        .cur_rx         dw ?

        .cur_tx         dw ?

        .last_tx        dw ?

        .phy_addr       dw ?

        .phy_mode       dw ?

        .mcr0           dw ?

        .mcr1           dw ?

        .switch_sig     dw ?

        .pci_bus        db ?

        .pci_dev        db ?

        .irq_line       db ?

        rb 1            ; dword alignment

        .tx_ring:       rb (((x_head.sizeof*TX_RING_SIZE)+32) and 0xfffffff0)

        .rx_ring:       rb (((x_head.sizeof*RX_RING_SIZE)+32) and 0xfffffff0)

        .size = $ - device

end virtual

section '.flat' code readable align 16

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

;;                        ;;

;; proc START             ;;

;;                        ;;

;; (standard driver proc) ;;

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

align 4

proc START stdcall, state:dword

        cmp [state], 1

        jne .exit

  .entry:

        DEBUGF  2,"Loading R6040 driver\n"

        stdcall RegService, my_service, service_proc

        ret

  .fail:

  .exit:

        xor eax, eax

        ret

endp

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

;;                        ;;

;; proc SERVICE_PROC      ;;

;;                        ;;

;; (standard driver proc) ;;

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

align 4

proc service_proc stdcall, ioctl:dword

        mov     edx, [ioctl]

        mov     eax, [IOCTL.io_code]

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

        cmp     eax, 0 ;SRV_GETVERSION

        jne     @F

        cmp     [IOCTL.out_size], 4

        jl      .fail

        mov     eax, [IOCTL.output]

        mov     [eax], dword API_VERSION

        xor     eax, eax

        ret

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

  @@:

        cmp     eax, 1 ;SRV_HOOK

        jne     .fail

        cmp     [IOCTL.inp_size], 3                     ; Data input must be at least 3 bytes

        jl      .fail

        mov     eax, [IOCTL.input]

        cmp     byte [eax], 1                           ; 1 means device number and bus number (pci) are given

        jne     .fail                                   ; other types arent supported for this card yet

; 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

; This device doesnt have its own eth_device structure yet, lets create one

  .firstdevice:

        cmp     [devices], MAX_DEVICES                  ; First check if the driver can handle one more card

        jge     .fail

        allocate_and_clear ebx, device.size, .fail      ; Allocate the buffer for device structure

; Fill in the direct call addresses into the struct

        mov     [device.reset], reset

        mov     [device.transmit], transmit

        mov     [device.get_MAC], read_mac

        mov     [device.set_MAC], .fail

        mov     [device.unload], unload

        mov     [device.name], my_service

; save the pci bus and device numbers

        mov     eax, [IOCTL.input]

        mov     cl , [eax+1]

        mov     [device.pci_bus], cl

        mov     cl , [eax+2]

        mov     [device.pci_dev], cl

; 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]

        DEBUGF  1,"Hooking into device, dev:%x, bus:%x, irq:%x, addr:%x\n",\

        [device.pci_dev]:1,[device.pci_bus]:1,[device.irq_line]:1,[device.io_addr]:4

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

        cli

        call    probe                                                   ; this function will output in eax

        test    eax, eax

        jnz     .err_sti                                                ; If an error occured, exit

        mov     eax, [devices]                                          ; Add the device structure to our device list

        mov     [device_list+4*eax], ebx                                ; (IRQ handler uses this list to find device)

        inc     [devices]                                               ;

        mov     [device.type], NET_TYPE_ETH

        call    NetRegDev

        sti

        cmp     eax, -1

        je      .destroy

        ret

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

  .find_devicenum:

        DEBUGF  1,"Trying to find device number of already registered device\n"

        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

        DEBUGF  1,"Kernel says: %u\n", eax

        ret

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

  .destroy:

        ; todo: reset device into virgin state

  .err_sti:

        sti

  .err:

        stdcall KernelFree, ebx

  .fail:

        or      eax, -1

        ret

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

endp

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

;;                                                                        ;;

;;        Actual Hardware dependent code starts here                      ;;

;;                                                                        ;;

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

macro mdio_write reg, val {

        stdcall phy_read, [device.io_addr], [device.phy_addr], reg

}

macro mdio_write reg, val {

        stdcall phy_write, [device.io_addr], [devce.phy_addr], reg, val

}

align 4

unload:

        ; TODO: (in this particular order)

        ;

        ; - Stop the device

        ; - Detach int handler

        ; - Remove device from local list (RTL8139_LIST)

        ; - call unregister function in kernel

        ; - Remove all allocated structures and buffers the card used

        or      eax,-1

ret

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

;;

;;  probe: enables the device (if it really is RTL8139)

;;

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

align 4

probe:

        DEBUGF  2,"Probing R6040 device\n"

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

        ; If PHY status change register is still set to zero

        ; it means the bootloader didn't initialize it

        set_io  0

        set_io  PHY_CC

        in      ax, dx

        test    ax, ax

        jnz     @f

        mov     ax, 0x9F07

        out     dx, ax

     @@:

        call    read_mac

        ; Some bootloaders/BIOSes do not initialize MAC address, warn about that

        and     eax, 0xFF

        or      eax, dword [device.mac]

        test    eax, eax

        jnz     @f

        DEBUGF  2, "ERROR: MAC address not initialized!\n"

     @@:

        ; Init RDC private data

        mov     [device.mcr0], 0x1002

        ;mov     [private.phy_addr], 1 ; Asper: Only one network card is supported now.

        mov     [device.switch_sig], 0

        ; Check the vendor ID on the PHY, if 0xFFFF assume none attached

        stdcall phy_read, 1, 2

        cmp     ax, 0xFFFF

        jne     @f

        DEBUGF  2, "Failed to detect an attached PHY\n" ;, generating random"

        mov     eax, -1

        ret

     @@:

        ; Set MAC address

        call    init_mac_regs

        ; Initialize and alloc RX/TX buffers

        call    init_txbufs

        call    init_rxbufs

        ; Read the PHY ID

        mov     [device.phy_mode], 0x8000

        stdcall phy_read, 0, 2

        mov     [device.switch_sig], ax

        cmp     ax, ICPLUS_PHY_ID

        jne     @f

        stdcall phy_write, 29, 31, 0x175C ; Enable registers

        jmp     .phy_readen

      @@:

        ; PHY Mode Check

        movzx   eax, [device.phy_addr]

        stdcall phy_write, eax, 4, PHY_CAP

        stdcall phy_write, eax, 0, PHY_MODE

      if PHY_MODE = 0x3100

        call    phy_mode_chk

        mov     [device.phy_mode], ax

        jmp     .phy_readen

      end if

      if not (PHY_MODE and 0x0100)

        mov     [device.phy_mode], 0

      end if

      .phy_readen:

        ; Set duplex mode

        mov     ax, [device.phy_mode]

        or      [device.mcr0], ax

        ; improve performance (by RDC guys)

        stdcall phy_read, 30, 17

        or      ax, 0x4000

        stdcall phy_write, 30, 17, eax

        stdcall phy_read, 30, 17

        and     ax, not 0x2000

        stdcall phy_write, 30, 17, eax

        stdcall phy_write, 0, 19, 0x0000

        stdcall phy_write, 0, 30, 0x01F0

        ; Initialize all Mac registers

        call    init_mac_regs

align 4

reset:

        DEBUGF  2,"Resetting R6040\n"

        ; Mask off Interrupt

        xor     ax, ax

        set_io  0

        set_io  MIER

        out     dx, ax

; attach int handler

        movzx   eax, [device.irq_line]

        DEBUGF  2,"Attaching int handler to irq %x\n", eax:1

        stdcall AttachIntHandler, eax, int_handler, dword 0

        test    eax, eax

        jnz     @f

        DEBUGF  2,"\nCould not attach int handler!\n"

;        or      eax, -1

;        ret

       @@:

        ;Reset RDC MAC

        mov     eax, MAC_RST

        set_io  0

        set_io  MCR1

        out     dx, ax

        mov     ecx, 2048 ;limit

  .read:

        in      ax, dx

        test    ax, 0x1

        jnz      @f

        dec     ecx

        test    ecx, ecx

        jnz     .read

  @@:

        ;Reset internal state machine

        mov     ax,  2

        set_io  MAC_SM

        out     dx, ax

        xor     ax, ax

        out     dx, ax

        mov     esi, 5

        stdcall Sleep

        ;MAC Bus Control Register

        mov     ax, MBCR_DEFAULT

        set_io  0

        set_io  MBCR

        out     dx, ax

        ;Buffer Size Register

        mov     ax, MAX_BUF_SIZE

        set_io  MR_BSR

        out     dx, ax

        ;Write TX ring start address

        lea     eax, [device.tx_ring]

        GetRealAddr

        set_io  MTD_SA0

        out     dx, ax

        shr     eax, 16

        set_io  MTD_SA1

        out     dx, ax

        ;Write RX ring start address

        lea     eax, [device.rx_ring]

        GetRealAddr

        set_io  MRD_SA0

        out     dx, ax

        shr     eax, 16

        set_io  MRD_SA1

        out     dx, ax

        ;Set interrupt waiting time and packet numbers

        xor     ax, ax

        set_io  MT_ICR

        out     dx, ax

        ;Enable interrupts

        mov     ax, INT_MASK

        set_io  MIER

        out     dx, ax

        ;Enable TX and RX

        mov     ax, [device.mcr0]

        or      ax, 0x0002

        set_io  0

        out     dx, ax

        ;Let TX poll the descriptors

        ;we may got called by tx_timeout which has left

        ;some unset tx buffers

        xor     ax, ax

        inc     ax

        set_io  0

        set_io  MTPR

        out     dx, ax

; Set the mtu, kernel will be able to send now

        mov     [device.mtu], 1514

        DEBUGF  1,"Reset ok\n"

        xor     eax, eax

        ret

align 4

init_txbufs:

        DEBUGF  1,"Init TxBufs\n"

        lea     esi, [device.tx_ring]

        lea     eax, [device.tx_ring + x_head.sizeof]

        GetRealAddr

        mov     ecx, TX_RING_SIZE

    .next_desc:

        mov     [esi + x_head.ndesc], eax

        mov     [esi + x_head.skb_ptr], 0

        mov     [esi + x_head.status], DSC_OWNER_MAC

        add     eax, x_head.sizeof

        add     esi, x_head.sizeof

        dec     ecx

        jnz     .next_desc

        lea     eax, [device.tx_ring]

        GetRealAddr

        mov     [device.tx_ring + x_head.sizeof*(TX_RING_SIZE - 1) + x_head.ndesc], eax

        ret

align 4

init_rxbufs:

        DEBUGF  1,"Init RxBufs\n"

        lea     esi, [device.rx_ring]

        lea     eax, [device.rx_ring + x_head.sizeof]

        GetRealAddr

        mov     edx, eax

        mov     ecx, RX_RING_SIZE

    .next_desc:

         mov     [esi + x_head.ndesc], edx

        push    esi ecx

        stdcall KernelAlloc, MAX_BUF_SIZE

        pop     ecx esi

        mov     [esi + x_head.skb_ptr], eax

        GetRealAddr

        mov     [esi + x_head.buf], eax

        mov     [esi + x_head.status], DSC_OWNER_MAC

        add     edx, x_head.sizeof

        add     esi, x_head.sizeof

        dec     ecx

        jnz     .next_desc

        ; complete the ring by linking the last to the first

        lea     eax, [device.rx_ring]

        GetRealAddr

        mov     [device.rx_ring + x_head.sizeof*(RX_RING_SIZE - 1) + x_head.ndesc], eax

        ret

align 4

phy_mode_chk:

        DEBUGF  1,"Checking PHY mode\n"

        ; PHY Link Status Check

        movzx   eax, [device.phy_addr]

        stdcall phy_read, eax, 1

        test    eax, 0x4

        jz      .ret_0x8000

        ; PHY Chip Auto-Negotiation Status

        movzx   eax, [device.phy_addr]

        stdcall phy_read, eax, 1

        test    eax, 0x0020

        jnz     .auto_nego

        ; Force Mode

        movzx   eax, [device.phy_addr]

        stdcall phy_read, eax, 0

        test    eax, 0x100

        jnz     .ret_0x8000

  .auto_nego:

        ; Auto Negotiation Mode

        movzx   eax, [device.phy_addr]

        stdcall phy_read, eax, 5

        mov     ecx, eax

        movzx   eax, [device.phy_addr]

        stdcall phy_read, eax, 4

        and     eax, ecx

        test    eax, 0x140

        jnz     .ret_0x8000

        xor     eax, eax

        ret

  .ret_0x8000:

        mov     eax, 0x8000

        ret

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

;;                                         ;;

;; Transmit                                ;;

;;                                         ;;

;; In: buffer pointer in [esp+4]           ;;

;;     size of buffer in [esp+8]           ;;

;;     pointer to device structure in ebx  ;;

;;                                         ;;

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

align 4

transmit:

        DEBUGF  2,"\nTransmitting packet, buffer:%x, size:%u\n", [esp+4], [esp+8]

        mov     eax, [esp+4]

        DEBUGF  2,"To: %x-%x-%x-%x-%x-%x From: %x-%x-%x-%x-%x-%x Type:%x%x\n",\

        [eax+00]:2,[eax+01]:2,[eax+02]:2,[eax+03]:2,[eax+04]:2,[eax+05]:2,\

        [eax+06]:2,[eax+07]:2,[eax+08]:2,[eax+09]:2,[eax+10]:2,[eax+11]:2,\

        [eax+13]:2,[eax+12]:2

        cmp     dword [esp+8], 1514

        jg      .fail

        cmp     dword [esp+8], 60

        jl      .fail

        movzx   edi, [device.cur_tx]

        shl     edi, 5

        add     edi, ebx

        add     edi, device.tx_ring - ebx

        DEBUGF  2,"TX buffer status: 0x%x\n", [edi + x_head.status]:4

        test    [edi + x_head.status], DSC_OWNER_MAC    ; check if buffer is available

        jnz     .wait_to_send

  .do_send:

        DEBUGF  2,"Sending now\n"

        mov     eax, [esp+4]

        mov     [edi + x_head.skb_ptr], eax

        GetRealAddr

        mov     [edi + x_head.buf], eax

        mov     ecx, [esp+8]

        mov     [edi + x_head.len], cx

        mov     [edi + x_head.status], DSC_OWNER_MAC

        ; Trigger the MAC to check the TX descriptor

        mov     ax, 0x01

        set_io  0

        set_io  MTPR

        out     dx, ax

        inc     [device.cur_tx]

        and     [device.cur_tx], TX_RING_SIZE - 1

        xor     eax, eax

; Update stats

        inc     [device.packets_tx]

        mov     eax, [esp+8]

        add     dword [device.bytes_tx], eax

        adc     dword [device.bytes_tx + 4], 0

        ret     8

  .wait_to_send:

        DEBUGF  2,"Waiting for TX buffer\n"

        call    GetTimerTicks           ; returns in eax

        lea     edx, [eax + 100]

     .l2:

        test    [edi + x_head.status], DSC_OWNER_MAC

        jz      .do_send

        mov     esi, 10

        call    Sleep

        call    GetTimerTicks

        cmp     edx, eax

        jl      .l2

        DEBUGF  1,"Send timeout\n"

        xor     eax, eax

        dec     eax

  .fail:

        DEBUGF  1,"Send failed\n"

        ret     8

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

;;                   ;;

;; Interrupt handler ;;

;;                   ;;

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

align 4

int_handler:

        DEBUGF  1,"\n%s int\n", my_service

; Find pointer of device wich made IRQ occur

        mov     ecx, [devices]

        test    ecx, ecx

        jz      .nothing

        mov     esi, device_list

  .nextdevice:

        mov     ebx, [esi]

        set_io  0

        set_io  MISR

        in      ax, dx

        out     dx, ax                  ; send it back to ACK

        test    ax, ax

        jnz     .got_it

  .continue:

        add     esi, 4

        dec     ecx

        jnz     .nextdevice

  .nothing:                             ; If no device was found, abort (The irq was probably for a device, not registered to this driver)

        ret

; At this point, test for all possible reasons, and handle accordingly

  .got_it:

        DEBUGF  1,"Device: %x Status: %x ", ebx, ax

        push ax

        test    word [esp], RX_FINISH

        jz      .no_RX

        push    ebx

  .more_RX:

        pop     ebx

        ; Find the current RX descriptor

        movzx   edx, [device.cur_rx]

        shl     edx, 5

        lea     edx, [device.rx_ring + edx]

        ; Check the descriptor status

        mov     cx, [edx + x_head.status]

        test    cx, DSC_OWNER_MAC

        jnz     .no_RX

        DEBUGF  2,"packet status=0x%x\n", cx

        test    cx, DSC_RX_ERR          ; Global error status set

        jnz     .no_RX

        ; Packet successfully received

        movzx   ecx, [edx + x_head.len]

        and     ecx, 0xFFF

        sub     ecx, 4                  ; Do not count the CRC

; Update stats

        add     dword [device.bytes_rx], ecx

        adc     dword [device.bytes_rx + 4], 0

        inc     dword [device.packets_rx]

        ; Push packet size and pointer, kernel will need it..

        push    ebx

        push    .more_RX

        push    ecx

        push    [edx + x_head.skb_ptr]

        DEBUGF  2,"packet ptr=0x%x\n", [edx + x_head.skb_ptr]

        ; reset the RX descriptor

        push    edx

        stdcall KernelAlloc, MAX_BUF_SIZE

        pop     edx

        mov     [edx + x_head.skb_ptr], eax

        GetRealAddr

        mov     [edx + x_head.buf], eax

        mov     [edx + x_head.status], DSC_OWNER_MAC

        ; Use next descriptor next time

        inc     [device.cur_rx]

        and     [device.cur_rx], RX_RING_SIZE - 1

        ; At last, send packet to kernel

        jmp     Eth_input

  .no_RX:

        test    word [esp], TX_FINISH

        jz      .no_TX

      .loop_tx:

        movzx   edi, [device.last_tx]

        shl     edi, 5

        lea     edi, [device.tx_ring + edi]

        test    [edi + x_head.status], DSC_OWNER_MAC

        jnz     .no_TX

        cmp     [edi + x_head.skb_ptr], 0

        je      .no_TX

        DEBUGF  2,"Freeing buffer 0x%x\n", [edi + x_head.skb_ptr]

        push    [edi + x_head.skb_ptr]

        mov     [edi + x_head.skb_ptr], 0

        call    KernelFree

        inc     [device.last_tx]

        and     [device.last_tx], TX_RING_SIZE - 1

        jmp     .loop_tx

  .no_TX:

        pop     ax

        ret

align 4

init_mac_regs:

        DEBUGF  2,"initializing MAC regs\n"

        ; MAC operation register

        mov     ax, 1

        set_io  0

        set_io  MCR1

        out     dx, ax

        ; Reset MAC

        mov     ax, 2

        set_io  MAC_SM

        out     dx, ax

        ; Reset internal state machine

        xor     ax, ax

        out     dx, ax

        mov     esi, 5

        stdcall Sleep

        call    read_mac

        ret

; Read a word data from PHY Chip

align 4

proc  phy_read stdcall, phy_addr:dword, reg:dword

        DEBUGF  2,"PHY read, addr=0x%x reg=0x%x\n", [phy_addr]:8, [reg]:8

        mov     eax, [phy_addr]

        shl     eax, 8

        add     eax, [reg]

        add     eax, MDIO_READ

        set_io  0

        set_io  MMDIO

        out     dx, ax

        ;Wait for the read bit to be cleared.

        mov     ecx, 2048 ;limit

  .read:

        in      ax, dx

        test    ax, MDIO_READ

        jz      @f

        dec     ecx

        jnz     .read

  @@:

        set_io  MMRD

        in      ax, dx

        and     eax, 0xFFFF

        DEBUGF  2,"PHY read, val=0x%x\n", eax:4

        ret

endp

; Write a word data to PHY Chip

align 4

proc  phy_write stdcall, phy_addr:dword, reg:dword, val:dword

        DEBUGF  2,"PHY write, addr=0x%x reg=0x%x val=0x%x\n", [phy_addr]:8, [reg]:8, [val]:8

        mov     eax, [val]

        set_io  0

        set_io  MMWD

        out     dx, ax

        ;Write the command to the MDIO bus

        mov     eax, [phy_addr]

        shl     eax, 8

        add     eax, [reg]

        add     eax, MDIO_WRITE

        set_io  MMDIO

        out     dx, ax

        ;Wait for the write bit to be cleared.

        mov     ecx, 2048 ;limit

  .write:

        in      ax, dx

        test    ax, MDIO_WRITE

        jz      @f

        dec     ecx

        jnz     .write

  @@:

        DEBUGF  2,"PHY write ok\n"

        ret

endp