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276 lines
9.8 KiB
276 lines
9.8 KiB
/* $Id: aurora.h,v 1.6 2001/06/05 12:23:38 davem Exp $
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* linux/drivers/sbus/char/aurora.h -- Aurora multiport driver
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*
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* Copyright (c) 1999 by Oliver Aldulea (oli@bv.ro)
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*
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* This code is based on the RISCom/8 multiport serial driver written
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* by Dmitry Gorodchanin (pgmdsg@ibi.com), based on the Linux serial
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* driver, written by Linus Torvalds, Theodore T'so and others.
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* The Aurora multiport programming info was obtained mainly from the
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* Cirrus Logic CD180 documentation (available on the web), and by
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* doing heavy tests on the board. Many thanks to Eddie C. Dost for the
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* help on the sbus interface.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Revision 1.0
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*
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* This is the first public release.
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*
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* This version needs a lot of feedback. This is the version that works
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* with _my_ board. My board is model 1600se, revision '@(#)1600se.fth
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* 1.2 3/28/95 1'. The driver might work with your board, but I do not
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* guarantee it. If you have _any_ type of board, I need to know if the
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* driver works or not, I need to know exactly your board parameters
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* (get them with 'cd /proc/openprom/iommu/sbus/sio16/; ls *; cat *')
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* Also, I need your board revision code, which is written on the board.
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* Send me the output of my driver too (it outputs through klogd).
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*
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* If the driver does not work, you can try enabling the debug options
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* to see what's wrong or what should be done.
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*
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* I'm sorry about the alignment of the code. It was written in a
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* 128x48 environment.
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*
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* I must say that I do not like Aurora Technologies' policy. I asked
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* them to help me do this driver faster, but they ended by something
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* like "don't call us, we'll call you", and I never heard anything
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* from them. They told me "knowing the way the board works, I don't
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* doubt you and others on the net will make the driver."
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* The truth about this board is that it has nothing intelligent on it.
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* If you want to say to somebody what kind of board you have, say that
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* it uses Cirrus Logic processors (CD180). The power of the board is
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* in those two chips. The rest of the board is the interface to the
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* sbus and to the peripherals. Still, they did something smart: they
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* reversed DTR and RTS to make on-board automatic hardware flow
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* control usable.
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* Thanks to Aurora Technologies for wasting my time, nerves and money.
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*/
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#ifndef __LINUX_AURORA_H
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#define __LINUX_AURORA_H
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#include <linux/serial.h>
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#include <linux/serialP.h>
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#ifdef __KERNEL__
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/* This is the number of boards to support. I've only tested this driver with
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* one board, so it might not work.
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*/
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#define AURORA_NBOARD 1
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/* Useful ? Yes. But you can safely comment the warnings if they annoy you
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* (let me say that again: the warnings in the code, not this define).
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*/
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#define AURORA_PARANOIA_CHECK
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/* Well, after many lost nights, I found that the IRQ for this board is
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* selected from four built-in values by writing some bits in the
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* configuration register. This causes a little problem to occur: which
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* IRQ to select ? Which one is the best for the user ? Well, I finally
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* decided for the following algorithm: if the "bintr" value is not acceptable
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* (not within type_1_irq[], then test the "intr" value, if that fails too,
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* try each value from type_1_irq until succeded. Hope it's ok.
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* You can safely reorder the irq's.
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*/
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#define TYPE_1_IRQS 4
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unsigned char type_1_irq[TYPE_1_IRQS] = {
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3, 5, 9, 13
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};
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/* I know something about another method of interrupt setting, but not enough.
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* Also, this is for another type of board, so I first have to learn how to
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* detect it.
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#define TYPE_2_IRQS 3
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unsigned char type_2_irq[TYPE_2_IRQS] = {
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0, 0, 0 ** could anyone find these for me ? (see AURORA_ALLIRQ below) **
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};
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unsigned char type_2_mask[TYPE_2_IRQS] = {
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32, 64, 128
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};
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*/
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/* The following section should only be modified by those who know what
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* they're doing (or don't, but want to help with some feedback). Modifying
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* anything raises a _big_ probability for your system to hang, but the
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* sacrifice worths. (I sacrificed my ext2fs many, many times...)
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*/
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/* This one tries to dump to console the name of almost every function called,
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* and many other debugging info.
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*/
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#undef AURORA_DEBUG
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/* These are the most dangerous and useful defines. They do printk() during
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* the interrupt processing routine(s), so if you manage to get "flooded" by
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* irq's, start thinking about the "Power off/on" button...
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*/
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#undef AURORA_INTNORM /* This one enables the "normal" messages, but some
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* of them cause flood, so I preffered putting
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* them under a define */
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#undef AURORA_INT_DEBUG /* This one is really bad. */
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/* Here's something helpful: after n irq's, the board will be disabled. This
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* prevents irq flooding during debug (no need to think about power
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* off/on anymore...)
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*/
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#define AURORA_FLOODPRO 10
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/* This one helps finding which irq the board calls, in case of a strange/
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* unsupported board. AURORA_INT_DEBUG should be enabled, because I don't
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* think /proc/interrupts or any command will be available in case of an irq
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* flood... "allirq" is the list of all free irq's.
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*/
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/*
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#define AURORA_ALLIRQ 6
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int allirq[AURORA_ALLIRQ]={
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2,3,5,7,9,13
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};
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*/
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/* These must not be modified. These values are assumed during the code for
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* performance optimisations.
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*/
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#define AURORA_NCD180 2 /* two chips per board */
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#define AURORA_NPORT 8 /* 8 ports per chip */
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/* several utilities */
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#define AURORA_BOARD(line) (((line) >> 4) & 0x01)
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#define AURORA_CD180(line) (((line) >> 3) & 0x01)
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#define AURORA_PORT(line) ((line) & 15)
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#define AURORA_TNPORTS (AURORA_NBOARD*AURORA_NCD180*AURORA_NPORT)
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/* Ticks per sec. Used for setting receiver timeout and break length */
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#define AURORA_TPS 4000
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#define AURORA_MAGIC 0x0A18
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/* Yeah, after heavy testing I decided it must be 6.
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* Sure, You can change it if needed.
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*/
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#define AURORA_RXFIFO 6 /* Max. receiver FIFO size (1-8) */
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#define AURORA_RXTH 7
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struct aurora_reg1 {
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__volatile__ unsigned char r;
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};
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struct aurora_reg128 {
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__volatile__ unsigned char r[128];
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};
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struct aurora_reg4 {
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__volatile__ unsigned char r[4];
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};
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struct Aurora_board {
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unsigned long flags;
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struct aurora_reg1 * r0; /* This is the board configuration
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* register (write-only). */
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struct aurora_reg128 * r[2]; /* These are the registers for the
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* two chips. */
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struct aurora_reg4 * r3; /* These are used for hardware-based
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* acknowledge. Software-based ack is
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* not supported by CD180. */
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unsigned int oscfreq; /* The on-board oscillator
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* frequency, in Hz. */
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unsigned char irq;
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#ifdef MODULE
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signed char count; /* counts the use of the board */
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#endif
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/* Values for the dtr_rts swapped mode. */
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unsigned char DTR;
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unsigned char RTS;
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unsigned char MSVDTR;
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unsigned char MSVRTS;
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/* Values for hardware acknowledge. */
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unsigned char ACK_MINT, ACK_TINT, ACK_RINT;
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};
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/* Board configuration register */
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#define AURORA_CFG_ENABLE_IO 8
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#define AURORA_CFG_ENABLE_IRQ 4
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/* Board flags */
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#define AURORA_BOARD_PRESENT 0x00000001
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#define AURORA_BOARD_ACTIVE 0x00000002
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#define AURORA_BOARD_TYPE_2 0x00000004 /* don't know how to
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* detect this yet */
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#define AURORA_BOARD_DTR_FLOW_OK 0x00000008
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/* The story goes like this: Cirrus programmed the CD-180 chip to do automatic
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* hardware flow control, and do it using CTS and DTR. CTS is ok, but, if you
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* have a modem and the chip drops DTR, then the modem will drop the carrier
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* (ain't that cute...). Luckily, the guys at Aurora decided to swap DTR and
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* RTS, which makes the flow control usable. I hope that all the boards made
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* by Aurora have these two signals swapped. If your's doesn't but you have a
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* breakout box, you can try to reverse them yourself, then set the following
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* flag.
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*/
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#undef AURORA_FORCE_DTR_FLOW
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/* In fact, a few more words have to be said about hardware flow control.
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* This driver handles "output" flow control through the on-board facility
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* CTS Auto Enable. For the "input" flow control there are two cases when
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* the flow should be controlled. The first case is when the kernel is so
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* busy that it cannot process IRQ's in time; this flow control can only be
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* activated by the on-board chip, and if the board has RTS and DTR swapped,
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* this facility is usable. The second case is when the application is so
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* busy that it cannot receive bytes from the kernel, and this flow must be
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* activated by software. This second case is not yet implemented in this
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* driver. Unfortunately, I estimate that the second case is the one that
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* occurs the most.
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*/
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struct Aurora_port {
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int magic;
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int baud_base;
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int flags;
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struct tty_struct * tty;
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int count;
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int blocked_open;
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long event;
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int timeout;
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int close_delay;
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unsigned char * xmit_buf;
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int custom_divisor;
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int xmit_head;
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int xmit_tail;
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int xmit_cnt;
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wait_queue_head_t open_wait;
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wait_queue_head_t close_wait;
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struct tq_struct tqueue;
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struct tq_struct tqueue_hangup;
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short wakeup_chars;
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short break_length;
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unsigned short closing_wait;
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unsigned char mark_mask;
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unsigned char SRER;
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unsigned char MSVR;
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unsigned char COR2;
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#ifdef AURORA_REPORT_OVERRUN
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unsigned long overrun;
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#endif
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#ifdef AURORA_REPORT_FIFO
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unsigned long hits[10];
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#endif
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};
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#endif
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#endif /*__LINUX_AURORA_H*/
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