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