1 README for arch/mips/gt64120 directory and subdirectories
2
3 Jun Sun, jsun@mvista.com or jsun@junsun.net
4 01/27, 2001
5
6 MOTIVATION
7 ----------
8
9 Many MIPS boards share the same system controller (or CPU companian chip),
10 such as GT-64120. It is highly desirable to let these boards share
11 the same controller code instead of duplicating them.
12
13 This directory is meant to hold all MIPS boards that use GT-64120 or GT-64120A.
14
15
16 HOW TO ADD A BOARD
17 ------------------
18
19 . Create a subdirectory include/asm/gt64120/<board>.
20
21 . Create a file called gt64120_dep.h under that directory.
22
23 . Modify include/asm/gt64120/gt64120.h file to include the new gt64120_dep.h
24 based on config options. The board-dep section is at the end of
25 include/asm/gt64120/gt64120.h file. There you can find all required
26 definitions include/asm/gt64120/<board>/gt64120_dep.h file must supply.
27
28 . Create a subdirectory arch/mips/gt64120/<board> directory to hold
29 board specific routines.
30
31 . The GT-64120 common code is supplied under arch/mips/gt64120/common directory.
32 It includes:
33 1) arch/mips/gt64120/pci.c -
34 common PCI routine, include the top-level pcibios_init()
35 2) arch/mips/gt64120/irq.c -
36 common IRQ routine, include the top-level do_IRQ()
37 [This part really belongs to arch/mips/kernel. jsun]
38 3) arch/mips/gt64120/gt_irq.c -
39 common IRQ routines for GT-64120 chip. Currently it only handles
40 the timer interrupt.
41
42 . Board-specific routines are supplied under arch/mips/gt64120/<board> dir.
43 1) arch/mips/gt64120/<board>/pci.c - it provides bus fixup routine
44 2) arch/mips/gt64120/<board>/irq.c - it provides enable/disable irqs
45 and board irq setup routine (irq_setup)
46 3) arch/mips/gt64120/<board>/int-handler.S -
47 The first-level interrupt dispatching routine.
48 4) a bunch of other "normal" stuff (setup, prom, dbg_io, reset, etc)
49
50 . Follow other "normal" procedure to modify configuration files, etc.
51
52
53 TO-DO LIST
54 ----------
55
56 . Expand arch/mips/gt64120/gt_irq.c to handle all GT-64120 interrupts.
57 We probably need to introduce GT_IRQ_BASE in board-dep header file,
58 which is used the starting irq_nr for all GT irqs.
59
60 A function, gt64120_handle_irq(), will be added so that the first-level
61 irq dispatcher will call this function if it detects an interrupt
62 from GT-64120.
63
64 . More support for GT-64120 PCI features (2nd PCI bus, perhaps)
65
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