forked from KolibriOS/kolibrios
341 lines
8.3 KiB
PHP
341 lines
8.3 KiB
PHP
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;***************************************************************************
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;
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; PCI CODE FOLLOWS
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;
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; the following functions provide access to the PCI interface.
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; These functions are used by scan_bus, and also some ethernet drivers
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;
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;***************************************************************************
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; PCI Bus defines
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PCI_HEADER_TYPE equ 0x0e ;8 bit
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PCI_BASE_ADDRESS_0 equ 0x10 ;32 bit
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PCI_BASE_ADDRESS_5 equ 0x24 ;32 bits
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PCI_BASE_ADDRESS_SPACE_IO equ 0x01
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PCI_VENDOR_ID equ 0x00 ;16 bit
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PCI_BASE_ADDRESS_IO_MASK equ 0xFFFFFFFC
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;***************************************************************************
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; Function
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; config_cmd
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;
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; Description
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; creates a command dword for use with the PCI bus
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; bus # in ebx
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; devfn in ecx
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; where in edx
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;
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; command dword returned in eax
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; Only eax destroyed
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;***************************************************************************
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config_cmd:
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push ecx
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mov eax, ebx
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shl eax, 16
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or eax, 0x80000000
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shl ecx, 8
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or eax, ecx
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pop ecx
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or eax, edx
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and eax, 0xFFFFFFFC
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ret
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;***************************************************************************
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; Function
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; pcibios_read_config_byte
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;
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; Description
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; reads a byte from the PCI config space
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; bus # in ebx
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; devfn in ecx
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; where in edx ( ls 16 bits significant )
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;
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; byte returned in al ( rest of eax zero )
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; Only eax/edx destroyed
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;***************************************************************************
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pcibios_read_config_byte:
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call config_cmd
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push dx
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mov dx, 0xCF8
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out dx, eax
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pop dx
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xor eax, eax
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and dx, 0x03
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add dx, 0xCFC
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; and dx, 0xFFC
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in al, dx
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ret
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;***************************************************************************
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; Function
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; pcibios_read_config_word
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;
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; Description
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; reads a word from the PCI config space
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; bus # in ebx
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; devfn in ecx
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; where in edx ( ls 16 bits significant )
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;
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; word returned in ax ( rest of eax zero )
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; Only eax/edx destroyed
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;***************************************************************************
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pcibios_read_config_word:
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call config_cmd
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push dx
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mov dx, 0xCF8
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out dx, eax
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pop dx
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xor eax, eax
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and dx, 0x02
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add dx, 0xCFC
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; and dx, 0xFFC
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in ax, dx
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ret
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;***************************************************************************
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; Function
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; pcibios_read_config_dword
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;
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; Description
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; reads a dword from the PCI config space
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; bus # in ebx
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; devfn in ecx
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; where in edx ( ls 16 bits significant )
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;
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; dword returned in eax
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; Only eax/edx destroyed
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;***************************************************************************
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pcibios_read_config_dword:
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push edx
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call config_cmd
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push dx
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mov dx, 0xCF8
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out dx, eax
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pop dx
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xor eax, eax
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mov dx, 0xCFC
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in eax, dx
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pop edx
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ret
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;***************************************************************************
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; Function
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; pcibios_write_config_byte
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;
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; Description
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; write a byte in al to the PCI config space
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; bus # in ebx
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; devfn in ecx
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; where in edx ( ls 16 bits significant )
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;
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; Only eax/edx destroyed
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;***************************************************************************
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pcibios_write_config_byte:
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push ax
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call config_cmd
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push dx
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mov dx, 0xCF8
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out dx, eax
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pop dx
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pop ax
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and dx, 0x03
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add dx, 0xCFC
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out dx, al
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ret
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;***************************************************************************
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; Function
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; pcibios_write_config_word
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;
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; Description
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; write a word in ax to the PCI config space
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; bus # in ebx
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; devfn in ecx
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; where in edx ( ls 16 bits significant )
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;
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; Only eax/edx destroyed
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;***************************************************************************
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pcibios_write_config_word:
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push ax
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call config_cmd
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push dx
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mov dx, 0xCF8
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out dx, eax
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pop dx
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pop ax
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and dx, 0x02
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add dx, 0xCFC
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out dx, ax
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ret
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;***************************************************************************
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; Function
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; delay_us
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;
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; Description
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; delays for 30 to 60 us
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;
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; I would prefer this routine to be able to delay for
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; a selectable number of microseconds, but this works for now.
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;
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; If you know a better way to do 2us delay, pleae tell me!
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;***************************************************************************
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delay_us:
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push eax
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push ecx
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mov ecx,2
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in al,0x61
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and al,0x10
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mov ah,al
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cld
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dcnt1:
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in al,0x61
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and al,0x10
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cmp al,ah
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jz dcnt1
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mov ah,al
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loop dcnt1
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pop ecx
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pop eax
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ret
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;***************************************************************************
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; Function
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; scan_bus
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;
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; Description
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; Scans the PCI bus for a supported device
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; If a supported device is found, the drvr_ variables are initialised
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; to that drivers functions ( as defined in the PCICards table)
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;
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; io_addr holds card I/O space. 32 bit, but only LS 16 bits valid
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; pci_data holds the PCI vendor + device code
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; pci_dev holds PCI bus dev #
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; pci_bus holds PCI bus #
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;
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; io_addr will be zero if no card found
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;
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;***************************************************************************
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scan_bus:
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xor eax, eax
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mov [hdrtype], al
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mov [pci_data], eax
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xor ebx, ebx ; ebx = bus# 0 .. 255
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sb_bus_loop:
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xor ecx, ecx ; ecx = devfn# 0 .. 254 ( not 255? )
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sb_devf_loop:
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mov eax, ecx
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and eax, 0x07
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cmp eax, 0
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jne sb_001
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mov edx, PCI_HEADER_TYPE
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call pcibios_read_config_byte
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mov [hdrtype], al
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jmp sb_002
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sb_001:
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mov al, [hdrtype]
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and al, 0x80
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cmp al, 0x80
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jne sb_inc_devf
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sb_002:
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mov edx, PCI_VENDOR_ID
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call pcibios_read_config_dword
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mov [vendor_device], eax
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cmp eax, 0xffffffff
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je sb_empty
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cmp eax, 0
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jne sb_check_vendor
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sb_empty:
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mov [hdrtype], byte 0
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jmp sb_inc_devf
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sb_check_vendor:
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; iterate though PCICards until end or match found
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mov esi, PCICards
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sb_check:
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cmp [esi], dword 0
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je sb_inc_devf ; Quit if at last entry
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cmp eax, [esi]
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je sb_got_card
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add esi, PCICARDS_ENTRY_SIZE
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jmp sb_check
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sb_got_card:
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; indicate that we have found the card
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mov [pci_data], eax
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mov [pci_dev], ecx
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mov [pci_bus], ebx
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; Define the driver functions
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push eax
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mov eax, [esi+4]
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mov [drvr_probe], eax
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mov eax, [esi+8]
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mov [drvr_reset], eax
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mov eax, [esi+12]
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mov [drvr_poll], eax
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mov eax, [esi+16]
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mov [drvr_transmit], eax
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mov eax, [esi+20]
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mov [drvr_cable], eax
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pop eax
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mov edx, PCI_BASE_ADDRESS_0
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sb_reg_check:
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call pcibios_read_config_dword
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mov [io_addr], eax
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and eax, PCI_BASE_ADDRESS_IO_MASK
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cmp eax, 0
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je sb_inc_reg
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mov eax, [io_addr]
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and eax, PCI_BASE_ADDRESS_SPACE_IO
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cmp eax, 0
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je sb_inc_reg
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mov eax, [io_addr]
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and eax, PCI_BASE_ADDRESS_IO_MASK
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mov [io_addr], eax
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sb_exit1:
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ret
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sb_inc_reg:
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add edx, 4
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cmp edx, PCI_BASE_ADDRESS_5
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jbe sb_reg_check
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sb_inc_devf:
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inc ecx
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cmp ecx, 255
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jb sb_devf_loop
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inc ebx
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cmp ebx, 256
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jb sb_bus_loop
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; We get here if we didn't find our card
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; set io_addr to 0 as an indication
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xor eax, eax
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mov [io_addr], eax
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sb_exit2:
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ret
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