$Id: milan_hw.txt,v 1.10 1999/11/17 20:19:40 rincewind Exp $

Milan Mini-Hardwaredocumentation

Memory layout:

$00000000 - _phystop	ST-RAM
$00E00000 - $00E7FFFF	TOS
$01000000 - _ramtop	TT-RAM

$40000000 - $7FFFFFFF	PCI memory, overlayed with ISA memory[1]
$80000000 - $BFFFFFFF	PCI I/O, overlayed with ISA I/O[1]
$C0000000 - $C000DFFF	PCI/ISA I/O using big endian addressing
$FFFF8000 - $FFFFBFFF	used by ST hardware emulation
$FFFFC000 - $FFFFDFFF	Milan onboard I/O:
$FFFFC000		memory controller
$FFFFC103+4*reg_no	MFP
$FFFFC200		PLX 9080
$FFFFE000 - $FFFFFFFF	used by ST hardware emulation

[1] PCI memory and IO are subtractively decoded, ie. any access that is not
claimed by a PCI device is forwarded to the ISA bus.


ISA IO:

byte read  adr: read from $C0000000+adr or read from $80000000+(adr^3)
byte write adr: write to  $C0000000+adr or write to  $80000000+(adr^3)
('adr' is an address on the ISA bus, eg. $278 for parallel port)

word read  adr: read from $80000000+(adr^2) or read from $C0000000+adr [2]
word write adr: write to  $80000000+(adr^2) or write to  $C0000000+adr [2]

[2] When using $C0000000 for WORD I/O, the data read/written needs to be
swapped (ror.w #8,d0)

Used ISA addresses:

$20  ISA interrupt controller
$60  Keyboard
$A0  ISA interrupt controller
$15C PC87308 SuperIO configuration registers
$1F0 primary IDE interface
$170 secondary IDE interface
$278 Parallel port
$2A0 serial port 3 (optional)
$2A8 serial port 4 (optional)
$2F8 serial port 2
$3F0 Floppy disk controller
$3F8 serial port 1
$400-$420 onboard (SuperIO etc.)

ISA Interrupts:
ISA Interrupt vectors are located at $140+4*isa_int_vector.
You must use Setexc() to set the vector, because otherwise the interrupt is
not enabled in the interrupt controller. Restore the old vector using
Setexc() when uninstalling your driver.

The interrupt routine must end with an RTE instruction, and does not have
to do anything special about the interrupt controller - EOI handling is
done by TOS.

Original ST MFP GPIO-Port:
BIT  DIR
 0   IN	  Centronics BUSY
 1   IN   MFP serial port DCD
 2   IN   MFP serial port CTS
 3   IN   GPU DONE from blitter
 4   IN   MIDI/keyboard ACIA interrupt
 5   IN   FDC/ACSI interrupt
 6   IN   MFP serial port RI
 7   IN   monochrome detect signal

MILAN MFP GPIO-Port:
BIT  DIR
 0   OUT  * MFP serial port RTS
 1   IN     MFP serial port DCD
 2   IN     MFP serial port CTS
 3   OUT  * MFP serial port DTR
 4   IN   * MFP serial port DSR
 5   IN   * not used
 6   IN     MFP serial port RI
 7   IN   * KEYLOCK switch

ISA Interrupts
 0	Timer
 1	keyboard
 3	87308 serial port 2
 4	87308 serial port 1
 5	available
 6	FDC
 7	printer port
 8	RTC
 9	available
10	available
11	available
12	PS/2 mouse port
13	available
14	PCI IDE primary channel
15	PCI IDE secondary channel

ISA DMA
0	(Byte)		free (used for refresh in original PC design)
1	(Byte)		free
2	(Byte)		floppy disk controller
3	(Byte)		free
4	Cascade
5	(16 Bit)	free
6	(16 Bit)	free
7	(16 Bit)	free


ISA I/O functions:
#define inb(port) (*(volatile UBYTE *)(0xC0000000L + (port))))
#define inw(port) (*(volatile UWORD *)(0x80000000L + (port)^2)))

#define outb(data, port) *(volatile UBYTE *)(0xC0000000L + (port)) = data;
#define outw(data, port) *(volatile UWORD *)(0x80000000L + (port)^2) = data;