kolibrios-gitea/kernel/trunk/network/eth_drv/pci.inc

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;;                                                              ;;
;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License    ;;
;;                                                              ;;
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$Revision$


;***************************************************************************
;
;  PCI CODE FOLLOWS
;
;  the following functions provide access to the PCI interface.
;  These functions are used by scan_bus, and also some ethernet drivers
;
;***************************************************************************

; PCI Bus defines
PCI_HEADER_TYPE             equ     0x0e  ;8 bit
PCI_BASE_ADDRESS_0          equ     0x10  ;32 bit
PCI_BASE_ADDRESS_5          equ     0x24  ;32 bits
PCI_BASE_ADDRESS_SPACE_IO   equ     0x01
PCI_VENDOR_ID               equ     0x00  ;16 bit
PCI_BASE_ADDRESS_IO_MASK    equ     0xFFFFFFFC

;***************************************************************************
;   Function
;      config_cmd
;
;   Description
;       creates a command dword  for use with the PCI bus
;       bus # in ebx
;      devfn in ecx
;       where in edx
;
;      command dword returned in eax
;       Only eax destroyed
;***************************************************************************
config_cmd:
        push    ecx
        mov     eax, ebx
        shl     eax, 16
        or      eax, 0x80000000
        shl     ecx, 8
        or      eax, ecx
        pop     ecx
        or      eax, edx
        and     eax, 0xFFFFFFFC
        ret

;***************************************************************************
;   Function
;      pcibios_read_config_byte
;
;   Description
;       reads a byte from the PCI config space
;       bus # in ebx
;      devfn in ecx
;       where in edx ( ls 16 bits significant )
;
;      byte returned in al ( rest of eax zero )
;       Only eax/edx destroyed
;***************************************************************************
pcibios_read_config_byte:
        call    config_cmd
        push    dx
        mov     dx, 0xCF8
        out     dx, eax
        pop     dx

        xor     eax, eax
        and     dx, 0x03
        add     dx, 0xCFC
;   and     dx, 0xFFC
        in      al, dx
        ret

;***************************************************************************
;   Function
;      pcibios_read_config_word
;
;   Description
;       reads a word from the PCI config space
;       bus # in ebx
;      devfn in ecx
;       where in edx ( ls 16 bits significant )
;
;      word returned in ax ( rest of eax zero )
;       Only eax/edx destroyed
;***************************************************************************
pcibios_read_config_word:
        call    config_cmd
        push    dx
        mov     dx, 0xCF8
        out     dx, eax
        pop     dx

        xor     eax, eax
        and     dx, 0x02
        add     dx, 0xCFC
;   and     dx, 0xFFC
        in      ax, dx
        ret

;***************************************************************************
;   Function
;      pcibios_read_config_dword
;
;   Description
;       reads a dword from the PCI config space
;       bus # in ebx
;      devfn in ecx
;       where in edx ( ls 16 bits significant )
;
;      dword returned in eax
;       Only eax/edx destroyed
;***************************************************************************
pcibios_read_config_dword:
        push    edx
        call    config_cmd
        push    dx
        mov     dx, 0xCF8
        out     dx, eax
        pop     dx
        xor     eax, eax
        mov     dx, 0xCFC
        in      eax, dx
        pop     edx
        ret

;***************************************************************************
;   Function
;      pcibios_write_config_byte
;
;   Description
;       write a byte in al to the PCI config space
;       bus # in ebx
;      devfn in ecx
;       where in edx ( ls 16 bits significant )
;
;       Only eax/edx destroyed
;***************************************************************************
pcibios_write_config_byte:
        push    ax
        call    config_cmd
        push    dx
        mov     dx, 0xCF8
        out     dx, eax
        pop     dx
        pop     ax

        and     dx, 0x03
        add     dx, 0xCFC
        out     dx, al
        ret

;***************************************************************************
;   Function
;      pcibios_write_config_word
;
;   Description
;       write a word in ax to the PCI config space
;       bus # in ebx
;      devfn in ecx
;       where in edx ( ls 16 bits significant )
;
;       Only eax/edx destroyed
;***************************************************************************
pcibios_write_config_word:
        push    ax
        call    config_cmd
        push    dx
        mov     dx, 0xCF8
        out     dx, eax
        pop     dx
        pop     ax

        and     dx, 0x02
        add     dx, 0xCFC
        out     dx, ax
        ret

;***************************************************************************
;   Function
;      delay_us
;
;   Description
;       delays for 30 to 60 us
;
;        I would prefer this routine to be able to delay for
;       a selectable number of microseconds, but this works for now.
;
;       If you know a better way to do 2us delay, pleae tell me!
;***************************************************************************
delay_us:
        push    eax
        push    ecx

        mov     ecx, 2

        in      al, 0x61
        and     al, 0x10
        mov     ah, al
        cld

dcnt1:
        in      al, 0x61
        and     al, 0x10
        cmp     al, ah
        jz      dcnt1

        mov     ah, al
        loop    dcnt1

        pop     ecx
        pop     eax

        ret

;***************************************************************************
;   Function
;      scan_bus
;
;   Description
;       Scans the PCI bus for a supported device
;        If a supported device is found, the drvr_ variables are initialised
;       to that drivers functions ( as defined in the PCICards table)
;
;        io_addr   holds card I/O space. 32 bit, but only LS 16 bits valid
;        pci_data  holds the PCI vendor + device code
;       pci_dev   holds PCI bus dev #
;       pci_bus   holds PCI bus #
;
;        io_addr will be zero if no card found
;
;***************************************************************************
scan_bus:
        xor     eax, eax
        mov     [hdrtype], al
        mov     [pci_data], eax

        xor     ebx, ebx     ; ebx = bus# 0 .. 255

sb_bus_loop:
        xor     ecx, ecx     ; ecx = devfn# 0 .. 254  ( not 255? )

sb_devf_loop:
        mov     eax, ecx
        and     eax, 0x07

        cmp     eax, 0
        jne     sb_001

        mov     edx, PCI_HEADER_TYPE
        call    pcibios_read_config_byte
        mov     [hdrtype], al
        jmp     sb_002

sb_001:
        mov     al, [hdrtype]
        and     al, 0x80
        cmp     al, 0x80
        jne     sb_inc_devf

sb_002:
        mov     edx, PCI_VENDOR_ID
        call    pcibios_read_config_dword
        mov     [vendor_device], eax
        cmp     eax, 0xffffffff
        je      sb_empty
        cmp     eax, 0
        jne     sb_check_vendor

sb_empty:
        mov     [hdrtype], byte 0
        jmp     sb_inc_devf

sb_check_vendor:
    ; iterate though PCICards until end or match found
        mov     esi, PCICards

sb_check:
        cmp     [esi], dword 0
        je      sb_inc_devf            ; Quit if at last entry
        cmp     eax, [esi]
        je      sb_got_card
        add     esi, PCICARDS_ENTRY_SIZE
        jmp     sb_check

sb_got_card:
    ; indicate that we have found the card
        mov     [pci_data], eax
        mov     [pci_dev], ecx
        mov     [pci_bus], ebx

    ; Define the driver functions
        push    eax
        mov     eax, [esi+4]
        mov     [drvr_probe], eax
        mov     eax, [esi+8]
        mov     [drvr_reset], eax
        mov     eax, [esi+12]
        mov     [drvr_poll], eax
        mov     eax, [esi+16]
        mov     [drvr_transmit], eax
        mov     eax, [esi+20]
        mov     [drvr_cable], eax
        pop     eax

        mov     edx, PCI_BASE_ADDRESS_0

sb_reg_check:
        call    pcibios_read_config_dword
        mov     [io_addr], eax
        and     eax, PCI_BASE_ADDRESS_IO_MASK
        cmp     eax, 0
        je      sb_inc_reg
        mov     eax, [io_addr]
        and     eax, PCI_BASE_ADDRESS_SPACE_IO
        cmp     eax, 0
        je      sb_inc_reg

        mov     eax, [io_addr]
        and     eax, PCI_BASE_ADDRESS_IO_MASK
        mov     [io_addr], eax

sb_exit1:
        ret

sb_inc_reg:
        add     edx, 4
        cmp     edx, PCI_BASE_ADDRESS_5
        jbe     sb_reg_check

sb_inc_devf:
        inc     ecx
        cmp     ecx, 255
        jb      sb_devf_loop
        inc     ebx
        cmp     ebx, 256
        jb      sb_bus_loop

    ; We get here if we didn't find our card
    ; set io_addr to 0 as an indication
        xor     eax, eax
        mov     [io_addr], eax

sb_exit2:
        ret