kolibrios/kernel/branches/net/drivers/sis900.asm

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                                                    ;;
;; 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		equ 0x01000100
	DRIVER_VERSION		equ 5

	MAX_DEVICES		equ 16

	DEBUG			equ 1
	__DEBUG__		equ 1
	__DEBUG_LEVEL__ 	equ 1

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

public START
public version

NUM_RX_DESC		equ 4		;* Number of RX descriptors *
NUM_TX_DESC		equ 1		;* Number of TX descriptors *
RX_BUFF_SZ		equ 1520	;* Buffer size for each Rx buffer *
TX_BUFF_SZ		equ 1516	;* Buffer size for each Tx buffer *
MAX_ETH_FRAME_SIZE	equ 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:
	mov	ebx, eax
	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	equ 6		; Size of Ethernet address
	ETH_HLEN	equ 14		; Size of ethernet header
	ETH_ZLEN	equ 60		; Minimum packet length
	DSIZE		equ 0x00000fff
	CRC_SIZE	equ 4
	RFADDR_shift	equ 16

; Symbolic offsets to registers.
	cr		equ 0x0 	      ; Command Register
	cfg		equ 0x4       ; Configuration Register
	mear		equ 0x8       ; EEPROM Access Register
	ptscr		equ 0xc       ; PCI Test Control Register
	isr		equ 0x10      ; Interrupt Status Register
	imr		equ 0x14      ; Interrupt Mask Register
	ier		equ 0x18      ; Interrupt Enable Register
	epar		equ 0x18      ; Enhanced PHY Access Register
	txdp		equ 0x20      ; Transmit Descriptor Pointer Register
	txcfg		equ 0x24      ; Transmit Configuration Register
	rxdp		equ 0x30      ; Receive Descriptor Pointer Register
	rxcfg		equ 0x34      ; Receive Configuration Register
	flctrl		equ 0x38      ; Flow Control Register
	rxlen		equ 0x3c      ; Receive Packet Length Register
	rfcr		equ 0x48      ; Receive Filter Control Register
	rfdr		equ 0x4C      ; Receive Filter Data Register
	pmctrl		equ 0xB0      ; Power Management Control Register
	pmer		equ 0xB4      ; Power Management Wake-up Event Register

; Command Register Bits
	RELOAD		equ 0x00000400
	ACCESSMODE	equ 0x00000200
	RESET		equ 0x00000100
	SWI		equ 0x00000080
	RxRESET 	equ 0x00000020
	TxRESET 	equ 0x00000010
	RxDIS		equ 0x00000008
	RxENA		equ 0x00000004
	TxDIS		equ 0x00000002
	TxENA		equ 0x00000001

; Configuration Register Bits
	DESCRFMT	equ 0x00000100 ; 7016 specific
	REQALG		equ 0x00000080
	SB		equ 0x00000040
	POW		equ 0x00000020
	EXD		equ 0x00000010
	PESEL		equ 0x00000008
	LPM		equ 0x00000004
	BEM		equ 0x00000001
	RND_CNT 	equ 0x00000400
	FAIR_BACKOFF	equ 0x00000200
	EDB_MASTER_EN	equ 0x00002000

; Eeprom Access Reigster Bits
	MDC		equ 0x00000040
	MDDIR		equ 0x00000020
	MDIO		equ 0x00000010	; 7016 specific
	EECS		equ 0x00000008
	EECLK		equ 0x00000004
	EEDO		equ 0x00000002
	EEDI		equ 0x00000001

; TX Configuration Register Bits
	ATP		equ 0x10000000 ;Automatic Transmit Padding
	MLB		equ 0x20000000 ;Mac Loopback Enable
	HBI		equ 0x40000000 ;HeartBeat Ignore (Req for full-dup)
	CSI		equ 0x80000000 ;CarrierSenseIgnore (Req for full-du

; RX Configuration Register Bits
	AJAB		equ 0x08000000 ;
	ATX		equ 0x10000000 ;Accept Transmit Packets
	ARP		equ 0x40000000 ;accept runt packets (<64bytes)
	AEP		equ 0x80000000 ;accept error packets

; Interrupt Reigster Bits
	WKEVT		equ 0x10000000
	TxPAUSEEND	equ 0x08000000
	TxPAUSE 	equ 0x04000000
	TxRCMP		equ 0x02000000
	RxRCMP		equ 0x01000000
	DPERR		equ 0x00800000
	SSERR		equ 0x00400000
	RMABT		equ 0x00200000
	RTABT		equ 0x00100000
	RxSOVR		equ 0x00010000
	HIBERR		equ 0x00008000
	SWINT		equ 0x00001000
	MIBINT		equ 0x00000800
	TxURN		equ 0x00000400
	TxIDLE		equ 0x00000200
	TxERR		equ 0x00000100
	TxDESC		equ 0x00000080
	TxOK		equ 0x00000040
	RxORN		equ 0x00000020
	RxIDLE		equ 0x00000010
	RxEARLY 	equ 0x00000008
	RxERR		equ 0x00000004
	RxDESC		equ 0x00000002
	RxOK		equ 0x00000001

; Interrupt Enable Register Bits
	IE		equ RxOK + TxOK

; Revision ID
	SIS900B_900_REV 	equ 0x03
	SIS630A_900_REV 	equ 0x80
	SIS630E_900_REV 	equ 0x81
	SIS630S_900_REV 	equ 0x82
	SIS630EA1_900_REV	equ 0x83
	SIS630ET_900_REV	equ 0x84
	SIS635A_900_REV 	equ 0x90
	SIS900_960_REV		equ 0x91

; Receive Filter Control Register Bits
	RFEN		equ 0x80000000
	RFAAB		equ 0x40000000
	RFAAM		equ 0x20000000
	RFAAP		equ 0x10000000
	RFPromiscuous	equ 0x70000000

; Reveive Filter Data Mask
	RFDAT		equ 0x0000FFFF

; Eeprom Address
	EEPROMSignature equ 0x00
	EEPROMVendorID	equ 0x02
	EEPROMDeviceID	equ 0x03
	EEPROMMACAddr	equ 0x08
	EEPROMChecksum	equ 0x0b

;The EEPROM commands include the alway-set leading bit.
	EEread		equ 0x0180
	EEwrite 	equ 0x0140
	EEerase 	equ 0x01C0
	EEwriteEnable	equ 0x0130
	EEwriteDisable	equ 0x0100
	EEeraseAll	equ 0x0120
	EEwriteAll	equ 0x0110
	EEaddrMask	equ 0x013F
	EEcmdShift	equ 16

;For SiS962 or SiS963, request the eeprom software access
	EEREQ		equ 0x00000400
	EEDONE		equ 0x00000200
	EEGNT		equ 0x00000100


;***************************************************************************
;
; probe
;
; Searches for an ethernet card, enables it and clears the rx buffer
;
; TODO: probe mii transceivers
;
;***************************************************************************
align 4
probe:

	stdcall PciWrite8, dword [device.pci_bus], dword [device.pci_dev], 0x40, 0	; Wake Up Chip

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

; Get Card Revision
	stdcall PciRead8, dword [device.pci_bus], dword [device.pci_dev], 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	[get_mac_func], eax
	mov	eax, [esi+8]		; Get pointer to special initialization fn
	mov	[special_func], eax

; Get MAC
	call	[get_mac_func]

; Call special initialization fn if requested

	cmp	[special_func],0
	je	@f
	call	[special_func]
       @@:

; Set table entries

	mov	 byte [table_entries], 16
	cmp	 [pci_revision], SIS635A_900_REV
	jae	 @f
	cmp	 [pci_revision], SIS900B_900_REV
	je	 @f
	mov	 byte [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	[pci_revision], SIS635A_900_REV
	je	.match
	cmp	[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, [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
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	mac_read_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

;------------------------
; Read 16-bits of data in

	xor	esi, esi
	mov	cx, 16
  .loop2:
	mov	eax, EECS
	out	dx, eax
	ee_delay

	or	eax, EECLK
	out	dx, eax
	ee_delay

	in	eax, dx
	shl	esi, 1
	test	eax, EEDO
	jz	@f
	inc	esi
       @@:
	loop	.loop2

;----------------------------
; Terminate the EEPROM access

	xor	eax, eax
	out	dx, eax
	ee_delay

	mov	eax, EECLK
	out	dx, eax
	ee_delay

	movzx	eax, si

	ret



align 4
write_mac:
	DEBUGF 1,'Setting MAC is not supported for SIS900 card.\n'
	add	esp, 6
	ret

;***************************************************************************
;
; int_handler
;
; handles received IRQs, which signal received packets
;
; Currently only supports one descriptor per packet, if packet is fragmented
; between multiple descriptors you will lose part of the packet
;
;***************************************************************************
align 4
int_handler:
; find pointer of device which made IRQ occur
	mov	esi, device_list
	mov	ecx, [devices]
	test	ecx, ecx
	jz	.nothing
.nextdevice:
	mov	ebx, [esi]
	set_io	0
	set_io	isr
	in	eax, dx ; note that this clears all interrupts
	test	ax, IE
	jnz	.got_it
	loop	.nextdevice
.nothing:
	ret
.got_it:

	test	ax, RxOK
	jz	.no_rx

	push	ax

;-----------
; Get Status
	movzx	eax, [device.cur_rx]		; find current discriptor
	shl	eax, 4				; * 16
	mov	ecx, dword[device.rxd+eax+4]	; get receive status

;-------------------------------------------
; Check RX_Status to see if packet is waiting
	test	ecx, 0x80000000
	jnz	.is_packet
	ret

;----------------------------------------------
; There is a packet waiting check it for errors
  .is_packet:
	test	ecx, 0x67C0000			; see if there are any errors
	jnz	.error_status

;---------------------
; Check size of packet
	and	ecx, DSIZE			; get packet size minus CRC
	sub	ecx, CRC_SIZE			; make sure packet contains data
	jle	.error_size

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

	push	ebx
	push	.return
	push	ecx				; packet size
	push	[device.rxd+eax+12]		; packet ptr
	DEBUGF	1, "Packet received OK\n"
	jmp	EthReceiver
  .return:
	pop	ebx

; Reset status, allow ethernet card access to descriptor
	movzx	ecx, [device.cur_rx]
	shl	ecx, 4				; *16
	mov	ecx, [device.rxd+ecx]
	stdcall KernelAlloc, RX_BUFF_SZ
	test	eax, eax
	jz	.fail
	mov	dword [ecx+12], eax
	GetRealAddr
	mov	dword [ecx+8], eax
	mov	dword [ecx+4], RX_BUFF_SZ

	inc	[device.cur_rx] 			 ; get next descriptor
	and	[device.cur_rx], NUM_RX_DESC-1		 ; only 4 descriptors 0-3

; Enable Receiver
	set_io	0
	set_io	cr		; Command Register offset
	in	eax, dx 	; Get current Command Register
	or	eax, RxENA	; Enable Receiver
	out	dx, eax

	pop	ax
	jmp	.no_rx

  .error_status:

	DEBUGF	1, "Packet error: %x\n", ecx
	jmp	.continue

  .error_size:

	DEBUGF	1, "Packet too large/small\n"
	jmp	.continue

  .no_rx:
	test	ax, TxOk
	jz	.no_tx

	;;; TODO: free all unused buffers
	stdcall   KernelFree, eax

  .no_tx:

	ret



;***************************************************************************
;   Function
;      transmit
;   Description
;      Transmits a packet of data via the ethernet card
;         buffer pointer in [esp+4]
;         size of buffer in [esp+8]
;         pointer to device structure in ebx
;
;      only one transmit descriptor is used
;
;***************************************************************************
align 4
transmit:

	cmp	dword [esp+8], MAX_ETH_FRAME_SIZE
	jg	transmit_finish

	cmp	dword [esp+8], 60
	jl	transmit_finish

	movzx	ecx, [device.cur_tx]
	shl	ecx, 4
	mov	ecx, [device.txd+ecx]

;; TODO: check if desc is empty (for example: check for eax, 0x6200000  at [ecx+4]
;;; or: count number of available descriptors

	mov	eax, [esp+4]
	mov	dword [ecx + 12], eax
	GetRealAddr
	mov	dword [ecx + 8], eax

	mov	eax, [esp+8]
	and	eax, DSIZE
	or	eax, 0x80000000 	; card owns descriptor
	mov	dword [ecx + 4], eax

; update stats
	inc	[device.packets_tx]
	add	dword [device.bytes_tx], ecx
	adc	dword [device.bytes_tx+4], 0

	ret	8


; End of code

align 4 					; Place all initialised data here

devices 	dd 0

specific_table:
;    dd SIS630A_900_REV,Get_Mac_SIS630A_900_REV,0
;    dd SIS630E_900_REV,Get_Mac_SIS630E_900_REV,0
    dd SIS630S_900_REV,Get_Mac_SIS635_900_REV,0
    dd SIS630EA1_900_REV,Get_Mac_SIS635_900_REV,0
    dd SIS630ET_900_REV,Get_Mac_SIS635_900_REV,0;SIS630ET_900_REV_SpecialFN
    dd SIS635A_900_REV,Get_Mac_SIS635_900_REV,0
    dd SIS900_960_REV,SIS960_get_mac_addr,0
    dd SIS900B_900_REV,get_mac_addr,0
    dd 0					; end of list

version 	dd (DRIVER_VERSION shl 16) or (API_VERSION and 0xFFFF)
my_service	db 'SIS900',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