mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-30 13:38:40 +00:00
66 lines
2.3 KiB
Plaintext
66 lines
2.3 KiB
Plaintext
|
README for arch/mips/gt64120 directory and subdirectories
|
||
|
|
|
||
|
|
Jun Sun, jsun@mvista.com or jsun@junsun.net
|
||
|
|
01/27, 2001
|
||
|
|
|
||
|
|
MOTIVATION
|
||
|
|
----------
|
||
|
|
|
||
|
|
Many MIPS boards share the same system controller (or CPU companian chip),
|
||
|
|
such as GT-64120. It is highly desirable to let these boards share
|
||
|
|
the same controller code instead of duplicating them.
|
||
|
|
|
||
|
|
This directory is meant to hold all MIPS boards that use GT-64120 or GT-64120A.
|
||
|
|
|
||
|
|
|
||
|
|
HOW TO ADD A BOARD
|
||
|
|
------------------
|
||
|
|
|
||
|
|
. Create a subdirectory include/asm/gt64120/<board>.
|
||
|
|
|
||
|
|
. Create a file called gt64120_dep.h under that directory.
|
||
|
|
|
||
|
|
. Modify include/asm/gt64120/gt64120.h file to include the new gt64120_dep.h
|
||
|
|
based on config options. The board-dep section is at the end of
|
||
|
|
include/asm/gt64120/gt64120.h file. There you can find all required
|
||
|
|
definitions include/asm/gt64120/<board>/gt64120_dep.h file must supply.
|
||
|
|
|
||
|
|
. Create a subdirectory arch/mips/gt64120/<board> directory to hold
|
||
|
|
board specific routines.
|
||
|
|
|
||
|
|
. The GT-64120 common code is supplied under arch/mips/gt64120/common directory.
|
||
|
|
It includes:
|
||
|
|
1) arch/mips/gt64120/pci.c -
|
||
|
|
common PCI routine, include the top-level pcibios_init()
|
||
|
|
2) arch/mips/gt64120/irq.c -
|
||
|
|
common IRQ routine, include the top-level do_IRQ()
|
||
|
|
[This part really belongs to arch/mips/kernel. jsun]
|
||
|
|
3) arch/mips/gt64120/gt_irq.c -
|
||
|
|
common IRQ routines for GT-64120 chip. Currently it only handles
|
||
|
|
the timer interrupt.
|
||
|
|
|
||
|
|
. Board-specific routines are supplied under arch/mips/gt64120/<board> dir.
|
||
|
|
1) arch/mips/gt64120/<board>/pci.c - it provides bus fixup routine
|
||
|
|
2) arch/mips/gt64120/<board>/irq.c - it provides enable/disable irqs
|
||
|
|
and board irq setup routine (irq_setup)
|
||
|
|
3) arch/mips/gt64120/<board>/int-handler.S -
|
||
|
|
The first-level interrupt dispatching routine.
|
||
|
|
4) a bunch of other "normal" stuff (setup, prom, dbg_io, reset, etc)
|
||
|
|
|
||
|
|
. Follow other "normal" procedure to modify configuration files, etc.
|
||
|
|
|
||
|
|
|
||
|
|
TO-DO LIST
|
||
|
|
----------
|
||
|
|
|
||
|
|
. Expand arch/mips/gt64120/gt_irq.c to handle all GT-64120 interrupts.
|
||
|
|
We probably need to introduce GT_IRQ_BASE in board-dep header file,
|
||
|
|
which is used the starting irq_nr for all GT irqs.
|
||
|
|
|
||
|
|
A function, gt64120_handle_irq(), will be added so that the first-level
|
||
|
|
irq dispatcher will call this function if it detects an interrupt
|
||
|
|
from GT-64120.
|
||
|
|
|
||
|
|
. More support for GT-64120 PCI features (2nd PCI bus, perhaps)
|
||
|
|
|