/* $Id: aurora.h,v 1.5 1999/12/02 09:55:16 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 #include #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; int 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*/