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