kolibrios/kernel/branches/net/drivers/dec21x4x.asm

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                                                 ;;
;; Copyright (C) KolibriOS team 2004-2013. All rights reserved.    ;;
;; Distributed under terms of the GNU General Public License       ;;
;;                                                                 ;;
;;  DEC 21x4x driver for KolibriOS                                 ;;
;;                                                                 ;;
;;  Based on dec21140.Asm from Solar OS by                         ;;
;;     Eugen Brasoveanu,                                           ;;
;;       Ontanu Bogdan Valentin                                    ;;
;;                                                                 ;;
;;  Written by hidnplayr@kolibrios.org                             ;;
;;                                                                 ;;
;;          GNU GENERAL PUBLIC LICENSE                             ;;
;;             Version 2, June 1991                                ;;
;;                                                                 ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

format MS COFF

        API_VERSION             = 0x01000100
        DRIVER_VERSION          = 5

        MAX_DEVICES             = 16

        RX_DES_COUNT            = 4     ; no of RX descriptors, must be power of 2
        RX_BUFF_SIZE            = 2048  ; size of buffer for each descriptor, must be multiple of 4 and <= 2048 TDES1_TBS1_MASK

        TX_DES_COUNT            = 4     ; no of TX descriptors, must be power of 2
        TX_BUFF_SIZE            = 2048  ; size of buffer for each descriptor, used for memory allocation only


        DEBUG                   = 1
        __DEBUG__               = 1
        __DEBUG_LEVEL__         = 1

include 'proc32.inc'
include 'imports.inc'
include 'fdo.inc'
include 'netdrv.inc'

public START
public service_proc
public version

virtual at ebx

        device:

        ETH_DEVICE

        .rx_p_des         dd ?  ; descriptors ring with received packets
        .tx_p_des         dd ?  ; descriptors ring with 'to transmit' packets
        .tx_free_des      dd ?  ; Tx descriptors available
        .tx_wr_des        dd ?  ; Tx current descriptor to write data to
        .tx_rd_des        dd ?  ; Tx current descriptor to read TX completion
        .rx_crt_des       dd ?  ; Rx current descriptor

        .io_addr          dd ?
        .pci_bus          db ?
        .pci_dev          db ?
        .irq_line         db ?

        .size = $ - device

end virtual

;-------------------------------------------
; configuration registers
;-------------------------------------------
CFCS                    = 4             ; configuration and status register

CSR0                    = 0x00          ; Bus mode
CSR1                    = 0x08          ; Transmit Poll Command
CSR2                    = 0x10          ; Receive Poll Command
CSR3                    = 0x18          ; Receive list base address
CSR4                    = 0x20          ; Transmit list base address
CSR5                    = 0x28          ; Status
CSR6                    = 0x30          ; Operation mode
CSR7                    = 0x38          ; Interrupt enable
CSR8                    = 0x40          ; Missed frames and overflow counter
CSR9                    = 0x48          ; Boot ROM, serial ROM, and MII management
CSR10                   = 0x50          ; Boot ROM programming address
CSR11                   = 0x58          ; General-purpose timer
CSR12                   = 0x60          ; General-purpose port
CSR13                   = 0x68
CSR14                   = 0x70
CSR15                   = 0x78          ; Watchdog timer

;--------bits/commands of CSR0-------------------
CSR0_RESET              = 1b

CSR0_WIE                = 1 shl 24      ; Write and Invalidate Enable
CSR0_RLE                = 1 shl 23      ; PCI Read Line Enable
CSR0_RML                = 1 shl 21      ; PCI Read Multiple

CSR0_CACHEALIGN_NONE    = 00b shl 14
CSR0_CACHEALIGN_32      = 01b shl 14
CSR0_CACHEALIGN_64      = 10b shl 14
CSR0_CACHEALIGN_128     = 11b shl 14

; using values from linux driver..
CSR0_DEFAULT            = CSR0_WIE + CSR0_RLE + CSR0_RML + CSR0_CACHEALIGN_NONE

;------- CSR5 -STATUS- bits --------------------------------
CSR5_TI                 = 1 shl 0       ; Transmit interupt - frame transmition completed
CSR5_TPS                = 1 shl 1       ; Transmit process stopped
CSR5_TU                 = 1 shl 2       ; Transmit Buffer unavailable
CSR5_TJT                = 1 shl 3       ; Transmit Jabber Timeout (transmitter had been excessively active)
CSR5_UNF                = 1 shl 5       ; Transmit underflow - FIFO underflow
CSR5_RI                 = 1 shl 6       ; Receive Interrupt
CSR5_RU                 = 1 shl 7       ; Receive Buffer unavailable
CSR5_RPS                = 1 shl 8       ; Receive Process stopped
CSR5_RWT                = 1 shl 9       ; Receive Watchdow Timeout
CSR5_ETI                = 1 shl 10      ; Early transmit Interrupt
CSR5_GTE                = 1 shl 11      ; General Purpose Timer Expired
CSR5_FBE                = 1 shl 13      ; Fatal bus error
CSR5_ERI                = 1 shl 14      ; Early receive Interrupt
CSR5_AIS                = 1 shl 15      ; Abnormal interrupt summary
CSR5_NIS                = 1 shl 16      ; normal interrupt summary
CSR5_RS_SH              = 17            ; Receive process state  -shift
CSR5_RS_MASK            = 111b          ;                        -mask
CSR5_TS_SH              = 20            ; Transmit process state -shift
CSR5_TS_MASK            = 111b          ;                        -mask
CSR5_EB_SH              = 23            ; Error bits             -shift
CSR5_EB_MASK            = 111b          ; Error bits             -mask

;CSR5 TS values
CSR5_TS_STOPPED                 = 000b
CSR5_TS_RUNNING_FETCHING_DESC   = 001b
CSR5_TS_RUNNING_WAITING_TX      = 010b
CSR5_TS_RUNNING_READING_BUFF    = 011b
CSR5_TS_RUNNING_SETUP_PCKT      = 101b
CSR5_TS_SUSPENDED               = 110b
CSR5_TS_RUNNING_CLOSING_DESC    = 111b

;------- CSR6 -OPERATION MODE- bits --------------------------------
CSR6_HP                 = 1 shl 0       ; Hash/Perfect Receive Filtering mode
CSR6_SR                 = 1 shl 1       ; Start/Stop receive
CSR6_HO                 = 1 shl 2       ; Hash only Filtering mode
CSR6_PB                 = 1 shl 3       ; Pass bad frames
CSR6_IF                 = 1 shl 4       ; Inverse filtering
CSR6_SB                 = 1 shl 5       ; Start/Stop backoff counter
CSR6_PR                 = 1 shl 6       ; Promiscuos mode -default after reset
CSR6_PM                 = 1 shl 7       ; Pass all multicast
CSR6_F                  = 1 shl 9       ; Full Duplex mode
CSR6_OM_SH              = 10            ; Operating Mode -shift
CSR6_OM_MASK            = 11b           ;                -mask
CSR6_FC                 = 1 shl 12      ; Force Collision Mode
CSR6_ST                 = 1 shl 13      ; Start/Stop Transmission Command
CSR6_TR_SH              = 14            ; Threshold Control      -shift
CSR6_TR_MASK            = 11b           ;                        -mask
CSR6_CA                 = 1 shl 17      ; Capture Effect Enable
CSR6_PS                 = 1 shl 18      ; Port select SRL / MII/SYM
CSR6_HBD                = 1 shl 19      ; Heartbeat Disable
CSR6_SF                 = 1 shl 21      ; Store and Forward -transmit full packet only
CSR6_TTM                = 1 shl 22      ; Transmit Threshold Mode -
CSR6_PCS                = 1 shl 23      ; PCS active and MII/SYM port operates in symbol mode
CSR6_SCR                = 1 shl 24      ; Scrambler Mode
CSR6_MBO                = 1 shl 25      ; Must Be One
CSR6_RA                 = 1 shl 30      ; Receive All
CSR6_SC                 = 1 shl 31      ; Special Capture Effect Enable


;------- CSR7 -INTERRUPT ENABLE- bits --------------------------------
CSR7_TI                 = 1 shl 0       ; transmit Interrupt Enable (set with CSR7<16> & CSR5<0> )
CSR7_TS                 = 1 shl 1       ; transmit Stopped Enable (set with CSR7<15> & CSR5<1> )
CSR7_TU                 = 1 shl 2       ; transmit buffer underrun Enable (set with CSR7<16> & CSR5<2> )
CSR7_TJ                 = 1 shl 3       ; transmit jabber timeout enable (set with CSR7<15> & CSR5<3> )
CSR7_UN                 = 1 shl 5       ; underflow Interrupt enable (set with CSR7<15> & CSR5<5> )
CSR7_RI                 = 1 shl 6       ; receive Interrupt enable (set with CSR7<16> & CSR5<5> )
CSR7_RU                 = 1 shl 7       ; receive buffer unavailable enable (set with CSR7<15> & CSR5<7> )
CSR7_RS                 = 1 shl 8       ; Receive stopped enable (set with CSR7<15> & CSR5<8> )
CSR7_RW                 = 1 shl 9       ; receive watchdog timeout enable (set with CSR7<15> & CSR5<9> )
CSR7_ETE                = 1 shl 10      ; Early transmit Interrupt enable (set with CSR7<15> & CSR5<10> )
CSR7_GPT                = 1 shl 11      ; general purpose timer enable (set with CSR7<15> & CSR5<11> )
CSR7_FBE                = 1 shl 13      ; Fatal bus error enable (set with CSR7<15> & CSR5<13> )
CSR7_ERE                = 1 shl 14      ; Early receive enable (set with CSR7<16> & CSR5<14> )
CSR7_AI                 = 1 shl 15      ; Abnormal Interrupt Summary Enable (enables CSR5<0,3,7,8,9,10,13>)
CSR7_NI                 = 1 shl 16      ; Normal Interrup Enable (enables CSR5<0,2,6,11,14>)

CSR7_DEFAULT            = CSR7_TI + CSR7_TS + CSR7_RI + CSR7_RS + CSR7_TU + CSR7_TJ + CSR7_UN + \
                                        CSR7_RU + CSR7_RW + CSR7_FBE + CSR7_AI + CSR7_NI

;----------- descriptor structure ---------------------
struc   DES {
        .status         dd ?    ; bit 31 is 'own' and rest is 'status'
        .length         dd ?    ; control bits + bytes-count buffer 1 + bytes-count buffer 2
        .buffer1        dd ?    ; pointer to buffer1
        .buffer2        dd ?    ; pointer to buffer2 or in this case to next descriptor, as we use a chained structure
        .virtaddr       dd ?
        .size = 64              ; 64, for alignment purposes
}

virtual at 0
        DES DES
end virtual

;common to Rx and Tx
DES0_OWN                = 1 shl 31              ; if set, the NIC controls the descriptor, otherwise driver 'owns' the descriptors

;receive
RDES0_ZER               = 1 shl 0               ; must be 0 if legal length :D
RDES0_CE                = 1 shl 1               ; CRC error, valid only on last desc (RDES0<8>=1)
RDES0_DB                = 1 shl 2               ; dribbling bit - not multiple of 8 bits, valid only on last desc (RDES0<8>=1)
RDES0_RE                = 1 shl 3               ; Report on MII error.. i dont realy know what this means :P
RDES0_RW                = 1 shl 4               ; received watchdog timer expiration - must set CSR5<9>, valid only on last desc (RDES0<8>=1)
RDES0_FT                = 1 shl 5               ; frame type: 0->IEEE802.0 (len<1500) 1-> ETHERNET frame (len>1500), valid only on last desc (RDES0<8>=1)
RDES0_CS                = 1 shl 6               ; Collision seen, valid only on last desc (RDES0<8>=1)
RDES0_TL                = 1 shl 7               ; Too long(>1518)-NOT AN ERROR, valid only on last desc (RDES0<8>=1)
RDES0_LS                = 1 shl 8               ; Last descriptor of current frame
RDES0_FS                = 1 shl 9               ; First descriptor of current frame
RDES0_MF                = 1 shl 10              ; Multicast frame, valid only on last desc (RDES0<8>=1)
RDES0_RF                = 1 shl 11              ; Runt frame, valid only on last desc (RDES0<8>=1) and id overflow
RDES0_DT_SERIAL         = 00b shl 12            ; Data type-Serial recv frame, valid only on last desc (RDES0<8>=1)
RDES0_DT_INTERNAL       = 01b shl 12            ; Data type-Internal loopback recv frame, valid only on last desc (RDES0<8>=1)
RDES0_DT_EXTERNAL       = 11b shl 12            ; Data type-External loopback recv frame, valid only on last desc (RDES0<8>=1)
RDES0_DE                = 1 shl 14              ; Descriptor error - cant own a new desc and frame doesnt fit, valid only on last desc (RDES0<8>=1)
RDES0_ES                = 1 shl 15              ; Error Summmary - bits 1+6+11+14, valid only on last desc (RDES0<8>=1)
RDES0_FL_SH             = 16                    ; Field length shift, valid only on last desc (RDES0<8>=1)
RDES0_FL_MASK           = 11111111111111b       ; Field length mask (+CRC), valid only on last desc (RDES0<8>=1)
RDES0_FF                = 1 shl 30              ; Filtering fail-frame failed address recognition test(must CSR6<30>=1), valid only on last desc (RDES0<8>=1)

RDES1_RBS1_MASK         = 11111111111b          ; first buffer size MASK
RDES1_RBS2_SH           = 11                    ; second buffer size SHIFT
RDES1_RBS2_MASK         = 11111111111b          ; second buffer size MASK
RDES1_RCH               = 1 shl 24              ; Second address chained - second address (buffer) is next desc address
RDES1_RER               = 1 shl 25              ; Receive End of Ring - final descriptor, NIC must return to first desc

;transmition
TDES0_DE                = 1 shl 0               ; Deffered
TDES0_UF                = 1 shl 1               ; Underflow error
TDES0_LF                = 1 shl 2               ; Link fail report (only if CSR6<23>=1)
TDES0_CC_SH             = 3                     ; Collision Count shift - no of collision before transmition
TDES0_CC_MASK           = 1111b                 ; Collision Count mask
TDES0_HF                = 1 shl 7               ; Heartbeat fail
TDES0_EC                = 1 shl 8               ; Excessive Collisions - >16 collisions
TDES0_LC                = 1 shl 9               ; Late collision
TDES0_NC                = 1 shl 10              ; No carrier
TDES0_LO                = 1 shl 11              ; Loss of carrier
TDES0_TO                = 1 shl 14              ; Transmit Jabber Timeout
TDES0_ES                = 1 shl 15              ; Error summary TDES0<1+8+9+10+11+14>=1

TDES1_TBS1_MASK         = 11111111111b          ; Buffer 1 size mask
TDES1_TBS2_SH           = 11                    ; Buffer 2 size shift
TDES1_TBS2_MASK         = 11111111111b          ; Buffer 2 size mask
TDES1_FT0               = 1 shl 22              ; Filtering type 0
TDES1_DPD               = 1 shl 23              ; Disabled padding for packets <64bytes, no padding
TDES1_TCH               = 1 shl 24              ; Second address chained - second buffer pointer is to next desc
TDES1_TER               = 1 shl 25              ; Transmit end of ring - final descriptor
TDES1_AC                = 1 shl 26              ; Add CRC disable -pretty obvious
TDES1_SET               = 1 shl 27              ; Setup packet
TDES1_FT1               = 1 shl 28              ; Filtering type 1
TDES1_FS                = 1 shl 29              ; First segment - buffer is first segment of frame
TDES1_LS                = 1 shl 30              ; Last segment
TDES1_IC                = 1 shl 31              ; Interupt on completion (CSR5<0>=1) valid when TDES1<30>=1

MAX_ETH_FRAME_SIZE      = 1514

RX_MEM_TOTAL_SIZE       = RX_DES_COUNT*(DES.size+RX_BUFF_SIZE)
TX_MEM_TOTAL_SIZE       = TX_DES_COUNT*(DES.size+TX_BUFF_SIZE)

;=============================================================================
; serial ROM operations
;=============================================================================
CSR9_SR                 = 1 shl 11        ; SROM Select
CSR9_RD                 = 1 shl 14        ; ROM Read Operation
CSR9_SROM_DO            = 1 shl 3         ; Data Out for SROM
CSR9_SROM_DI            = 1 shl 2         ; Data In to SROM
CSR9_SROM_CK            = 1 shl 1         ; clock for SROM
CSR9_SROM_CS            = 1 shl 0         ; chip select.. always needed

; assume dx is CSR9
macro SROM_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
}

; assume dx is CSR9
macro MDIO_Delay {
        push    eax
        in      eax, dx
        pop     eax
}

macro Bit_Set a_bit {
        in      eax, dx
        or      eax, a_bit
        out     dx , eax
}

macro Bit_Clear a_bit {
        in      eax, dx
        and     eax, not (a_bit)
        out     dx, eax
}


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 %s driver\n", my_service
        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
        jb      .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
        jb      .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
        jae     .fail

        push    edx
        stdcall KernelAlloc, dword device.size          ; Allocate the buffer for eth_device structure
        pop     edx
        test    eax, eax
        jz      .fail
        mov     ebx, eax                                ; ebx is always used as a pointer to the structure (in driver, but also in kernel code)

; 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], write_mac
        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  2,"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]:8

        allocate_and_clear [device.rx_p_des], RX_DES_COUNT*(DES.size+RX_BUFF_SIZE), .err
        allocate_and_clear [device.tx_p_des], TX_DES_COUNT*(DES.size+TX_BUFF_SIZE), .err

; Ok, the eth_device structure is ready, let's probe the device
; Because initialization fires IRQ, IRQ handler must be aware of this device
        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]                                               ;

        call    probe                                                   ; this function will output in eax
        test    eax, eax
        jnz     .err2                                                   ; If an error occured, exit


        mov     [device.type], NET_TYPE_ETH
        call    NetRegDev

        cmp     eax, -1
        je      .destroy

        ret

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

  .find_devicenum:
        DEBUGF  2,"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  2,"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

  .err2:
        dec     [devices]
  .err:
        DEBUGF  2,"removing device structure\n"
        stdcall KernelFree, [device.rx_p_des]
        stdcall KernelFree, [device.tx_p_des]
        stdcall KernelFree, ebx


  .fail:
        or      eax, -1
        ret

;------------------------------------------------------
endp


;;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\;;
;;                                                                        ;;
;;        Actual Hardware dependent code starts here                      ;;
;;                                                                        ;;
;;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\;;



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


macro status {
        set_io  CSR5
        in      eax, dx
        DEBUGF  1,"CSR5: %x\n", eax
}


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                         ;;
;; Probe                                   ;;
;;                                         ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

align 4
probe:

        DEBUGF  2,"Probing dec21x4x device: "

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

        movzx   eax, [device.pci_bus]
        movzx   ecx, [device.pci_dev]
        stdcall PciRead32, eax ,ecx ,0                                ; get device/vendor id
        DEBUGF  1,"Vendor id: 0x%x\n", ax

        cmp     ax, 0x1011
        jne     .notfound
        shr     eax, 16
        DEBUGF  1,"Vendor ok!, device id: 0x%x\n", ax                 ; TODO: use another method to detect chip!

        cmp     ax, 0x0009
        je      .supported_device

        cmp     ax, 0x0019
        je      .supported_device2

  .notfound:
        DEBUGF  1,"Device not supported!\n"
        or      eax, -1
        ret

  .supported_device2:

        ; wake up the 21143

        movzx   ecx, [device.pci_bus]
        movzx   edx, [device.pci_dev]
        xor     eax, eax
        stdcall PciWrite32, ecx, edx, 0x40, eax


  .supported_device:
        call    SROM_GetWidth           ; TODO: use this value returned in ecx
                                        ; in the read_word routine!

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                         ;;
;; Reset                                   ;;
;;                                         ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

align 4
reset:

        DEBUGF  2,"Resetting dec21x4x\n"

;-----------------------------------------------------------
; board software reset - if fails, dont do nothing else

        set_io  0
        status
        set_io  CSR0
        mov     eax, CSR0_RESET
        out     dx, eax

; wait at least 50 PCI cycles
        mov     esi, 1000
        call    Sleep

;-----------
; setup CSR0

        set_io  0
        status
        set_io  CSR0
        mov     eax, CSR0_DEFAULT
        out     dx, eax


; wait at least 50 PCI cycles
        mov     esi, 1000
        call    Sleep

;-----------------------------------
; Read mac from eeprom to driver ram

        call    read_mac_eeprom

;--------------------------------
; insert irq handler on given irq

        movzx   eax, [device.irq_line]
        DEBUGF  1,"Attaching int handler to irq %x\n", eax:1
        stdcall AttachIntHandler, eax, int_handler, dword 0
        test    eax, eax
        jnz     @f
        DEBUGF  1,"\nCould not attach int handler!\n"
;        or      eax, -1
;        ret
  @@:

        set_io  0
        status

        call    init_ring

;--------------------------------------------
; setup CSR3 & CSR4 (pointers to descriptors)

        set_io  0
        status
        set_io  CSR3
        mov     eax, [device.rx_p_des]
        GetRealAddr
        DEBUGF  1,"RX descriptor base address: %x\n", eax
        out     dx, eax

        set_io  CSR4
        mov     eax, [device.tx_p_des]
        GetRealAddr
        DEBUGF  1,"TX descriptor base address: %x\n", eax
        out     dx, eax

;-------------------------------------------------------
; setup interrupt mask register -expect IRQs from now on

        status
        DEBUGF  1,"Enabling interrupts\n"
        set_io  CSR7
        mov     eax, CSR7_DEFAULT
        out     dx, eax
        status

;----------
; enable RX

        set_io  0
        status
        DEBUGF  1,"Enable RX\n"

        set_io  CSR6
        Bit_Set CSR6_SR; or CSR6_PR or CSR6_ST
        DEBUGF  1,"CSR6: %x\n", eax

        status

        call    start_link

; wait a bit
        mov     esi, 3000
        call    Sleep

;----------------------------------------------------
; send setup packet to notify the board about the MAC

        call    Send_Setup_Packet

        xor     eax, eax
; clear packet/byte counters

        lea     edi, [device.bytes_tx]
        mov     ecx, 6
        rep     stosd

; Set the mtu, kernel will be able to send now
        mov     [device.mtu], 1514

        DEBUGF  1,"Reset done\n"

        ret



align 4
init_ring:

;------------------------------------------
; Setup RX descriptors (use chained method)

        mov     eax, [device.rx_p_des]
        GetRealAddr
        mov     edx, eax
        push    eax
        lea     esi, [eax + RX_DES_COUNT*(DES.size)]    ; jump over RX descriptors
        mov     eax, [device.rx_p_des]
        add     eax, RX_DES_COUNT*(DES.size)            ; jump over RX descriptors
        mov     edi, [device.rx_p_des]
        mov     ecx, RX_DES_COUNT
  .loop_rx_des:
        add     edx, DES.size
        mov     [edi + DES.status], DES0_OWN            ; hardware owns buffer
        mov     [edi + DES.length], 1984 + RDES1_RCH    ; only size of first buffer, chained buffers
        mov     [edi + DES.buffer1], esi                ; hw buffer address
        mov     [edi + DES.buffer2], edx                ; pointer to next descriptor
        mov     [edi + DES.virtaddr], eax               ; virtual buffer address
        DEBUGF  1,"RX desc: buff addr: %x, next desc: %x, real buff addr: %x, real descr addr: %x \n", esi, edx, eax, edi

        add     esi, RX_BUFF_SIZE
        add     eax, RX_BUFF_SIZE
        add     edi, DES.size
        dec     ecx
        jnz     .loop_rx_des

; set last descriptor as LAST
        sub     edi, DES.size
        or      [edi + DES.length], RDES1_RER           ; EndOfRing
        pop     [edi + DES.buffer2]                     ; point it to the first descriptor

;---------------------
; Setup TX descriptors

        mov     eax, [device.tx_p_des]
        GetRealAddr
        mov     edx, eax
        push    eax
        lea     esi, [eax + TX_DES_COUNT*(DES.size)]    ; jump over TX descriptors
        mov     eax, [device.tx_p_des]
        add     eax, TX_DES_COUNT*(DES.size)            ; jump over TX descriptors
        mov     edi, [device.tx_p_des]
        mov     ecx, TX_DES_COUNT
  .loop_tx_des:
        add     edx, DES.size
        mov     [edi + DES.status], 0                   ; owned by driver
        mov     [edi + DES.length], TDES1_TCH           ; chained method
        mov     [edi + DES.buffer1], esi                ; pointer to buffer
        mov     [edi + DES.buffer2], edx                ; pointer to next descr
        mov     [edi + DES.virtaddr], eax
        DEBUGF  1,"TX desc: buff addr: %x, next desc: %x, virt buff addr: %x, virt descr addr: %x \n", esi, edx, eax, edi

        add     esi, TX_BUFF_SIZE
        add     eax, TX_BUFF_SIZE
        add     edi, DES.size
        dec     ecx
        jnz     .loop_tx_des
        
; set last descriptor as LAST
        sub     edi, DES.size
        or      [edi + DES.length], TDES1_TER           ; EndOfRing
        pop     [edi + DES.buffer2]                     ; point it to the first descriptor

;------------------
; Reset descriptors

        mov     [device.tx_wr_des], 0
        mov     [device.tx_rd_des], 0
        mov     [device.rx_crt_des], 0
        mov     [device.tx_free_des], TX_DES_COUNT

        ret


align 4
start_link:

        ; TODO: write working code here

        ret

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                         ;;
;; Send setup packet                       ;;
;;                                         ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

align 4
Send_Setup_Packet:

        DEBUGF  1,"Sending setup packet\n"

; if no descriptors available, out
        mov     ecx, 1000
@@loop_wait_desc:
        cmp     [device.tx_free_des], 0
        jne     @f

        dec     ecx
        jnz     @@loop_wait_desc

        mov     eax, -1
        ret
      @@:

; go to current send descriptor
        mov     edi, [device.tx_p_des]
        mov     eax, [device.tx_wr_des]
        DEBUGF  1,"Got free descriptor: %u (%x)", eax, edi
        mov     edx, DES.size
        mul     edx
        add     edi, eax
        DEBUGF  1,"=>%x\n",  edi

; if NOT sending FIRST setup packet, must set current descriptor to 0 size for both buffers,
;  and go to next descriptor for real setup packet...            ;; TODO: check if 2 descriptors are available

;       cmp     [device.tx_packets], 0
;       je      .first
;               
;       and     [edi+DES.des1], 0
;       mov     [edi+DES.des0], DES0_OWN
;               
; go to next descriptor
;        inc     [device.tx_wr_des]
;        and     [device.tx_wr_des], TX_DES_COUNT-1
;
; dec free descriptors count
;        cmp     [device.tx_free_des], 0
;        jz      @f
;        dec     [device.tx_free_des]
;       @@:
;
;       ; recompute pointer to current descriptor
;       mov     edi, [device.tx_p_des]
;       mov     eax, [device.tx_wr_des]
;       mov     edx, DES.size
;       mul     edx
;       add     edi, eax

  .first:

        push    edi
; copy setup packet to current descriptor
        mov     edi, [edi + DES.virtaddr]
; copy the address once
        lea     esi, [device.mac]
        DEBUGF  1,"copying packet to %x from %x\n", edi, esi
        mov     ecx, 3  ; mac is 6 bytes thus 3 words
  .loop:
        DEBUGF  1,"%x ", [esi]:4
        movsw
        inc     edi
        inc     edi
        dec     ecx
        jnz     .loop

        DEBUGF  1,"\n"

; copy 15 times the broadcast address
        mov     ecx, 3*15
        mov     eax, 0xffffffff
        rep     stosd

        pop     edi

; setup descriptor
        DEBUGF  1,"setting up descriptor\n"
        mov     [edi + DES.length], TDES1_IC + TDES1_SET + TDES1_TCH + 192        ; size must be EXACTLY 192 bytes
        mov     [edi + DES.status], DES0_OWN

        DEBUGF  1,"status: %x\n", [edi + DES.status]:8
        DEBUGF  1,"length: %x\n", [edi + DES.length]:8
        DEBUGF  1,"buffer1: %x\n", [edi + DES.buffer1]:8
        DEBUGF  1,"buffer2: %x\n", [edi + DES.buffer2]:8

; go to next descriptor
        inc     [device.tx_wr_des]
        and     [device.tx_wr_des], TX_DES_COUNT-1

; dec free descriptors count
        cmp     [device.tx_free_des], 0
        jz      @f
        dec     [device.tx_free_des]
       @@:

; start tx
        set_io  0
        status
        set_io  CSR6
        in      eax, dx
        test    eax, CSR6_ST            ; if NOT started, start now
        jnz     .already_started
        or      eax, CSR6_ST
        DEBUGF  1,"Starting TX\n"
        jmp     .do_it
  .already_started:
                                        ; if already started, issue a Transmit Poll command
        set_io  CSR1
        xor     eax, eax
        DEBUGF  1,"Issuing transmit poll command\n"
  .do_it:
        out     dx, eax
        status

        DEBUGF  1,"Sending setup packet, completed!\n"

        ret



;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                         ;;
;; Transmit                                ;;
;;                                         ;;
;; In: buffer pointer in [esp+4]           ;;
;;     size of buffer in [esp+8]           ;;
;;     pointer to device structure in ebx  ;;
;;                                         ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

align 4
transmit:

        DEBUGF  1,"Transmitting packet, buffer:%x, size:%u\n",[esp+4],[esp+8]
        mov     eax, [esp+4]
        DEBUGF  1,"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], MAX_ETH_FRAME_SIZE
        ja      .fail

        cmp     [device.tx_free_des], 0
        je      .fail

;--------------------------
; copy packet to crt buffer
        
        mov     eax, [device.tx_wr_des]
        mov     edx, DES.size
        mul     edx
        add     eax, [device.tx_p_des]
        mov     edi, [eax + DES.virtaddr]                 ; pointer to buffer
        mov     esi, [esp+4]
        mov     ecx, [esp+8]
        DEBUGF  1,"copying %u bytes from %x to %x\n", ecx, esi, edi
        rep     movsb

; set packet size
        mov     ecx, [eax+DES.length]
        and     ecx, TDES1_TER                          ; preserve 'End of Ring' bit
        or      ecx, [esp+8]                            ; set size
        or      ecx, TDES1_FS or TDES1_LS or TDES1_IC or TDES1_TCH    ; first descr, last descr, interrupt on complete, chained modus
        mov     [eax+DES.length], ecx

; set descriptor info
        mov     [eax+DES.status], DES0_OWN                ; say it is now owned by the 21x4x

; start tx
        set_io  0
        status
        set_io  CSR6
        in      eax, dx
        test    eax, CSR6_ST            ; if NOT started, start now
        jnz     .already_started
        or      eax, CSR6_ST
        DEBUGF  1,"Starting TX\n"
        jmp     .do_it
  .already_started:
                                        ; if already started, issues a Transmit Poll command
        set_io  CSR1
        mov     eax, -1
  .do_it:
        out     dx , eax

; Update stats

        inc     [device.packets_tx]
        mov     eax, [esp+8]
        add     dword [device.bytes_tx], eax
        adc     dword [device.bytes_tx + 4], 0

; go to next descriptor
        inc     [device.tx_wr_des]
        and     [device.tx_wr_des], TX_DES_COUNT-1

; dec free descriptors count
        test    [device.tx_free_des], -1
        jz      .end
        dec     [device.tx_free_des]
  .end:
        status

        DEBUGF  1,"transmit ok\n"
        xor     eax, eax
        stdcall KernelFree, [esp+4]
        ret     8

  .fail:
        DEBUGF  1,"transmit failed\n"
        or      eax, -1
        stdcall KernelFree, [esp+4]
        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  CSR5
        in      eax, dx
        out     dx, eax                                 ; send it back to ACK
        test    eax, eax
        jnz     .got_it
  .continue:
        add     esi, 4
        dec     ecx
        jnz     .nextdevice
  .nothing:
        ret                                             ; If no device was found, abort (The irq was probably for a device, not registered to this driver)

  .got_it:

        DEBUGF  1,"Device: %x CSR5: %x ", ebx, ax

;----------------------------------
; TX ok?

        test    ax, CSR5_TI
        jz      .not_tx
        push    ax esi ecx

        DEBUGF 1,"TX ok!\n"
                
        ; go to current descriptor
        mov     edi, [device.tx_p_des]

        mov     eax, [device.tx_rd_des]
        mov     edx, DES.size
        mul     edx
        add     edi, eax
                
      .loop_tx:
                
        ; done if all desc are free
        cmp     [device.tx_free_des], TX_DES_COUNT
        jz      .end_tx

        mov     eax, [edi+DES.status]

        ; we stop at first desc that is owned be NIC
        test    eax, DES0_OWN
        jnz     .end_tx

        ; detect is setup packet
        cmp     eax, (0ffffffffh - DES0_OWN)            ; all other bits are 1
        jne     .not_setup_packet
        DEBUGF  1,"Setup Packet detected\n"
      .not_setup_packet:

        DEBUGF  1,"packet status: %x\n", eax

        ; next descriptor
        add     edi, DES.size
        inc     [device.tx_rd_des]
        and     [device.tx_rd_des], TX_DES_COUNT-1

        ; inc free desc
        inc     [device.tx_free_des]
        cmp     [device.tx_free_des], TX_DES_COUNT
        jbe     @f
        mov     [device.tx_free_des], TX_DES_COUNT
       @@:

        jmp     .loop_tx
      .end_tx:
                
        ;------------------------------------------------------
        ; here must be called standard Ethernet Tx Irq Handler
        ;------------------------------------------------------

        pop     ecx esi ax

;----------------------------------
; RX irq
  .not_tx:
        test    ax, CSR5_RI
        jz      .not_rx
        push    ax esi ecx

        DEBUGF 1,"RX ok!\n"

        push    ebx
  .rx_loop:
        pop     ebx

        ; get current descriptor
        mov     edi, [device.rx_p_des]
        mov     eax, [device.rx_crt_des]
        mov     edx, DES.size
        mul     edx
        add     edi, eax

        ; now check status
        mov     eax, [edi + DES.status]

        test    eax, DES0_OWN
        jnz     .end_rx                                 ; current desc is busy, nothing to do

        test    eax, RDES0_FS
        jz      .end_rx                                 ; current desc is NOT first packet, ERROR!

        test    eax, RDES0_LS                           ; if not last desc of packet, error for now
        jz      .end_rx

        test    eax, RDES0_ES
        jnz     .end_rx

        mov     esi, [edi + DES.virtaddr]
        mov     ecx, [edi + DES.status]
        shr     ecx, RDES0_FL_SH
        and     ecx, RDES0_FL_MASK
        sub     ecx, 4                                  ; crc, we dont need it

        DEBUGF  1,"Received packet!, size=%u, addr:%x\n", ecx, esi

        push    esi edi ecx
        stdcall KernelAlloc, ecx                        ; Allocate a buffer to put packet into
        pop     ecx edi esi
        test    eax, eax
        jz      .fail

        push    ebx
        push    dword .rx_loop
        push    ecx eax
        mov     edi, eax

; update statistics
        inc     [device.packets_rx]
        add     dword [device.bytes_rx], ecx
        adc     dword [device.bytes_rx + 4], 0

; copy packet data
        shr     cx , 1
        jnc     .nb
        movsb
  .nb:
        shr     cx , 1
        jnc     .nw
        movsw
  .nw:
        rep     movsd

        mov     [edi + DES.status], DES0_OWN            ; free descriptor
                
        inc     [device.rx_crt_des]                     ; next descriptor
        and     [device.rx_crt_des], RX_DES_COUNT-1

        jmp     Eth_input

  .end_rx:
  .fail:
        pop     ecx esi ax
  .not_rx:

        jmp     .continue



align 4
write_mac:      ; in: mac pushed onto stack (as 3 words)

        DEBUGF  2,"Writing MAC: "

; write data into driver cache
        mov     esi, esp
        lea     edi, [device.mac]
        movsd
        movsw
        add     esp, 6
        
; send setup packet (only if driver is started)
        call    Send_Setup_Packet

align 4
read_mac:

        DEBUGF 1,"Read_mac\n"

        ret



align 4
read_mac_eeprom:

        DEBUGF 1,"Read_mac_eeprom\n"

        lea     edi, [device.mac]
        mov     esi, 20/2               ; read words, start address is 20
     .loop:
        push    esi edi
        call    SROM_Read_Word
        pop     edi esi
        stosw
        inc     esi
        cmp     esi, 26/2
        jb      .loop

        DEBUGF  2,"%x-%x-%x-%x-%x-%x\n",[edi-6]:2,[edi-5]:2,[edi-4]:2,[edi-3]:2,[edi-2]:2,[edi-1]:2

        ret

align 4
write_mac_eeprom:

        DEBUGF 1,"Write_mac_eeprom\n"

        ret


align 4
SROM_GetWidth:  ; should be 6 or 8 according to some manuals (returns in ecx)

        DEBUGF 1,"SROM_GetWidth\n"

        call    SROM_Idle
        call    SROM_EnterAccessMode

;        set_io  0
;        set_io  CSR9

        ; send 110b

        in      eax, dx
        or      eax, CSR9_SROM_DI
        call    SROM_out

        in      eax, dx
        or      eax, CSR9_SROM_DI
        call    SROM_out

        in      eax, dx
        and     eax, not (CSR9_SROM_DI)
        call    SROM_out
        
        mov     ecx,1
  .loop2:
        Bit_Set CSR9_SROM_CK
        SROM_Delay
        
        in      eax, dx
        and     eax, CSR9_SROM_DO
        jnz     .not_zero

        Bit_Clear CSR9_SROM_CK
        SROM_Delay
        jmp     .end_loop2
  .not_zero:
        
        Bit_Clear CSR9_SROM_CK
        SROM_Delay
        
        inc     ecx
        cmp     ecx, 12
        jbe     .loop2
  .end_loop2:
        
        DEBUGF 1,"Srom width=%u\n", ecx
        
        call    SROM_Idle
        call    SROM_EnterAccessMode
        call    SROM_Idle
        
        ret


align 4
SROM_out:

        out     dx, eax
        SROM_Delay
        Bit_Set CSR9_SROM_CK
        SROM_Delay
        Bit_Clear CSR9_SROM_CK
        SROM_Delay

        ret



align 4
SROM_EnterAccessMode:

        DEBUGF 1,"SROM_EnterAccessMode\n"

        set_io  0
        set_io  CSR9
        mov     eax, CSR9_SR
        out     dx, eax
        SROM_Delay

        Bit_Set CSR9_RD
        SROM_Delay

        Bit_Clear CSR9_SROM_CK
        SROM_Delay

        Bit_Set CSR9_SROM_CS
        SROM_Delay
        
        ret



align 4
SROM_Idle:

        DEBUGF 1,"SROM_Idle\n"

        call    SROM_EnterAccessMode
        
;        set_io  0
;        set_io  CSR9
        
        mov     ecx, 25
     .loop_clk:

        Bit_Clear CSR9_SROM_CK
        SROM_Delay
        Bit_Set CSR9_SROM_CK
        SROM_Delay
        
        dec     ecx
        jnz     .loop_clk

        
        Bit_Clear CSR9_SROM_CK
        SROM_Delay
        Bit_Clear CSR9_SROM_CS
        SROM_Delay
        
        xor     eax, eax
        out     dx, eax
        
        ret


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                                                      ;;
;; Read serial EEprom word                                              ;;
;;                                                                      ;;
;; In: esi = read address                                               ;;
;; OUT: ax = data word                                                  ;;
;;                                                                      ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
align 4
SROM_Read_Word:

        DEBUGF 1,"SROM_Read_word at: %x result: ", esi

        set_io  0
        set_io  CSR9

; enter access mode
        mov     eax, CSR9_SR + CSR9_RD
        out     dx , eax
        or      eax, CSR9_SROM_CS
        out     dx , eax

        ; TODO: change this hard-coded 6-bit stuff to use value from srom_getwidth
        
; send read command "110b" + address to read from
        and     esi, 111111b
        or      esi, 110b shl 6
        
        mov     ecx, 1 shl 9
  .loop_cmd:
        mov     eax, CSR9_SR + CSR9_RD + CSR9_SROM_CS
        test    esi, ecx
        jz      @f
        or      eax, CSR9_SROM_DI
       @@:
        out     dx , eax
        SROM_Delay
        or      eax, CSR9_SROM_CK
        out     dx , eax
        SROM_Delay
        
        shr     ecx, 1
        jnz     .loop_cmd

; read data from SROM

        xor     esi, esi
        mov     ecx, 17 ;;; TODO: figure out why 17, not 16
  .loop_read:
        
        mov     eax, CSR9_SR + CSR9_RD + CSR9_SROM_CS + CSR9_SROM_CK
        out     dx , eax
        SROM_Delay
        
        in      eax, dx
        and     eax, CSR9_SROM_DO
        shr     eax, 3
        shl     esi, 1
        or      esi, eax
        
        mov     eax, CSR9_SR + CSR9_RD + CSR9_SROM_CS
        out     dx , eax
        SROM_Delay
        
        dec     ecx
        jnz     .loop_read
        
        mov     eax, esi

        DEBUGF 1,"%x\n", ax

        ret







;<<<<<<<<<<<<<<<<<<<<<<<<<<<<



;*********************************************************************
;* Media Descriptor Code                                             *
;*********************************************************************

; MII transceiver control section.
; Read and write the MII registers using software-generated serial
; MDIO protocol.  See the MII specifications or DP83840A data sheet
; for details.

; The maximum data clock rate is 2.5 Mhz.  The minimum timing is usually
; met by back-to-back PCI I/O cycles, but we insert a delay to avoid
; "overclocking" issues or future 66Mhz PCI.

; Read and write the MII registers using software-generated serial
; MDIO protocol.  It is just different enough from the EEPROM protocol
; to not share code.  The maxium data clock rate is 2.5 Mhz.

MDIO_SHIFT_CLK          =        0x10000
MDIO_DATA_WRITE0        =        0x00000
MDIO_DATA_WRITE1        =        0x20000
MDIO_ENB                =        0x00000         ; Ignore the 0x02000 databook setting.
MDIO_ENB_IN             =        0x40000
MDIO_DATA_READ          =        0x80000

; MII transceiver control section.
; Read and write the MII registers using software-generated serial
; MDIO protocol.  See the MII specifications or DP83840A data sheet
; for details.

align 4
mdio_read:      ; phy_id:edx, location:esi

        DEBUGF  1,"mdio read, phy=%x, location=%x", edx, esi

        shl     edx, 5
        or      esi, edx
        or      esi, 0xf6 shl 10

        set_io  0
        set_io  CSR9

;    if (tp->chip_id == LC82C168) {
;        int i = 1000;
;        outl(0x60020000 + (phy_id<<23) + (location<<18), ioaddr + 0xA0);
;        inl(ioaddr + 0xA0);
;        inl(ioaddr + 0xA0);
;        while (--i > 0)
;            if ( ! ((retval = inl(ioaddr + 0xA0)) & 0x80000000))
;                return retval & 0xffff;
;        return 0xffff;
;    }
;
;    if (tp->chip_id == COMET) {
;        if (phy_id == 1) {
;            if (location < 7)
;                return inl(ioaddr + 0xB4 + (location<<2));
;            else if (location == 17)
;                return inl(ioaddr + 0xD0);
;            else if (location >= 29 && location <= 31)
;                return inl(ioaddr + 0xD4 + ((location-29)<<2));
;        }
;        return 0xffff;
;    }

; Establish sync by sending at least 32 logic ones.

        mov     ecx, 32
  .loop:
        mov     eax, MDIO_ENB or MDIO_DATA_WRITE1
        out     dx, eax
        MDIO_Delay

        or      eax, MDIO_SHIFT_CLK
        out     dx, eax
        MDIO_Delay

        dec     ecx
        jnz     .loop


; Shift the read command bits out.

        mov     ecx, 1 shl 15
  .loop2:
        mov     eax, MDIO_ENB
        test    esi, ecx
        jz      @f
        or      eax, MDIO_DATA_WRITE1
       @@:
        out     dx, eax
        MDIO_Delay

        or      eax, MDIO_SHIFT_CLK
        out     dx, eax
        MDIO_Delay

        shr     ecx, 1
        jnz     .loop2


; Read the two transition, 16 data, and wire-idle bits.

        xor     esi, esi
        mov     ecx, 19
  .loop3:
        mov     eax, MDIO_ENB_IN
        out     dx, eax
        MDIO_Delay

        shl     esi, 1
        in      eax, dx
        test    eax, MDIO_DATA_READ
        jz      @f
        inc     esi
       @@:

        mov     eax, MDIO_ENB_IN or MDIO_SHIFT_CLK
        out     dx, eax
        MDIO_Delay

        dec     ecx
        jnz     .loop3

        shr     esi, 1
        movzx   eax, si

        DEBUGF  1,", data=%x\n", ax

        ret




align 4
mdio_write:     ;int phy_id: edx, int location: edi, int value: ax)

        DEBUGF  1,"mdio write, phy=%x, location=%x, data=%x\n", edx, edi, ax

        shl     edi, 18
        or      edi, 0x5002 shl 16
        shl     edx, 23
        or      edi, edx
        mov     di, ax

        set_io  0
        set_io  CSR9

;    if (tp->chip_id == LC82C168) {
;        int i = 1000;
;        outl(cmd, ioaddr + 0xA0);
;        do
;            if ( ! (inl(ioaddr + 0xA0) & 0x80000000))
;                break;
;        while (--i > 0);
;        return;
;    }

;    if (tp->chip_id == COMET) {
;        if (phy_id != 1)
;            return;
;        if (location < 7)
;            outl(value, ioaddr + 0xB4 + (location<<2));
;        else if (location == 17)
;            outl(value, ioaddr + 0xD0);
;        else if (location >= 29 && location <= 31)
;            outl(value, ioaddr + 0xD4 + ((location-29)<<2));
;        return;
;    }


; Establish sync by sending at least 32 logic ones.

        mov     ecx, 32
  .loop:
        mov     eax, MDIO_ENB or MDIO_DATA_WRITE1
        out     dx, eax
        MDIO_Delay

        or      eax, MDIO_SHIFT_CLK
        out     dx, eax
        MDIO_Delay

        dec     ecx
        jnz     .loop


; Shift the command bits out.

        mov     ecx, 1 shl 31
  .loop2:
        mov     eax, MDIO_ENB
        test    edi, ecx
        jz      @f
        or      eax, MDIO_DATA_WRITE1
       @@:
        out     dx, eax
        MDIO_Delay

        or      eax, MDIO_SHIFT_CLK
        out     dx, eax
        MDIO_Delay

        shr     ecx, 1
        jnz     .loop2


; Clear out extra bits.

        mov     ecx, 2
  .loop3:
        mov     eax, MDIO_ENB
        out     dx, eax
        MDIO_Delay

        or      eax, MDIO_SHIFT_CLK
        out     dx, eax
        MDIO_Delay

        dec     ecx
        jnz     .loop3

        ret


; End of code
align 4                                         ; Place all initialised data here

devices       dd 0
version       dd (DRIVER_VERSION shl 16) or (API_VERSION and 0xFFFF)
my_service    db 'DEC21X4X',0                    ; max 16 chars include zero

include_debug_strings                           ; All data wich FDO uses will be included here

section '.data' data readable writable align 16 ; place all uninitialized data place here

device_list rd MAX_DEVICES                     ; This list contains all pointers to device structures the driver is handling