drivers/sbus/char/aurora.h

   1 /*      $Id: aurora.h,v 1.6 2001/06/05 12:23:38 davem Exp $
   2  *      linux/drivers/sbus/char/aurora.h -- Aurora multiport driver
   3  *
   4  *      Copyright (c) 1999 by Oliver Aldulea (oli@bv.ro)
   5  *
   6  *      This code is based on the RISCom/8 multiport serial driver written
   7  *      by Dmitry Gorodchanin (pgmdsg@ibi.com), based on the Linux serial
   8  *      driver, written by Linus Torvalds, Theodore T'so and others.
   9  *      The Aurora multiport programming info was obtained mainly from the
  10  *      Cirrus Logic CD180 documentation (available on the web), and by
  11  *      doing heavy tests on the board. Many thanks to Eddie C. Dost for the
  12  *      help on the sbus interface.
  13  *
  14  *      This program is free software; you can redistribute it and/or modify
  15  *      it under the terms of the GNU General Public License as published by
  16  *      the Free Software Foundation; either version 2 of the License, or
  17  *      (at your option) any later version.
  18  *
  19  *      This program is distributed in the hope that it will be useful,
  20  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *      GNU General Public License for more details.
  23  *
  24  *      You should have received a copy of the GNU General Public License
  25  *      along with this program; if not, write to the Free Software
  26  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27  *
  28  *      Revision 1.0
  29  *
  30  *      This is the first public release.
  31  *
  32  *      This version needs a lot of feedback. This is the version that works
  33  *      with _my_ board. My board is model 1600se, revision '@(#)1600se.fth
  34  *      1.2 3/28/95 1'. The driver might work with your board, but I do not
  35  *      guarantee it. If you have _any_ type of board, I need to know if the
  36  *      driver works or not, I need to know exactly your board parameters
  37  *      (get them with 'cd /proc/openprom/iommu/sbus/sio16/; ls *; cat *')
  38  *      Also, I need your board revision code, which is written on the board.
  39  *      Send me the output of my driver too (it outputs through klogd).
  40  *
  41  *      If the driver does not work, you can try enabling the debug options
  42  *      to see what's wrong or what should be done.
  43  *
  44  *      I'm sorry about the alignment of the code. It was written in a
  45  *      128x48 environment.
  46  *
  47  *      I must say that I do not like Aurora Technologies' policy. I asked
  48  *      them to help me do this driver faster, but they ended by something
  49  *      like "don't call us, we'll call you", and I never heard anything
  50  *      from them. They told me "knowing the way the board works, I don't
  51  *      doubt you and others on the net will make the driver."
  52  *      The truth about this board is that it has nothing intelligent on it.
  53  *      If you want to say to somebody what kind of board you have, say that
  54  *      it uses Cirrus Logic processors (CD180). The power of the board is
  55  *      in those two chips. The rest of the board is the interface to the
  56  *      sbus and to the peripherals. Still, they did something smart: they
  57  *      reversed DTR and RTS to make on-board automatic hardware flow
  58  *      control usable.
  59  *      Thanks to Aurora Technologies for wasting my time, nerves and money.
  60  */
  61
  62 #ifndef __LINUX_AURORA_H
  63 #define __LINUX_AURORA_H
  64
  65 #include <linux/serial.h>
  66 #include <linux/serialP.h>
  67
  68 #ifdef __KERNEL__
  69
  70 /* This is the number of boards to support. I've only tested this driver with
  71  * one board, so it might not work.
  72  */
  73 #define AURORA_NBOARD 1
  74
  75 /* Useful ? Yes. But you can safely comment the warnings if they annoy you
  76  * (let me say that again: the warnings in the code, not this define).
  77  */
  78 #define AURORA_PARANOIA_CHECK
  79
  80 /* Well, after many lost nights, I found that the IRQ for this board is
  81  * selected from four built-in values by writing some bits in the
  82  * configuration register. This causes a little problem to occur: which
  83  * IRQ to select ? Which one is the best for the user ? Well, I finally
  84  * decided for the following algorithm: if the "bintr" value is not acceptable
  85  * (not within type_1_irq[], then test the "intr" value, if that fails too,
  86  * try each value from type_1_irq until succeded. Hope it's ok.
  87  * You can safely reorder the irq's.
  88  */
  89 #define TYPE_1_IRQS 4
  90 unsigned char type_1_irq[TYPE_1_IRQS] = {
  91         3, 5, 9, 13
  92 };
  93 /* I know something about another method of interrupt setting, but not enough.
  94  * Also, this is for another type of board, so I first have to learn how to
  95  * detect it.
  96 #define TYPE_2_IRQS 3
  97 unsigned char type_2_irq[TYPE_2_IRQS] = {
  98         0, 0, 0 ** could anyone find these for me ? (see AURORA_ALLIRQ below) **
  99         };
 100 unsigned char type_2_mask[TYPE_2_IRQS] = {
 101         32, 64, 128
 102         };
 103 */
 104
 105 /* The following section should only be modified by those who know what
 106  * they're doing (or don't, but want to help with some feedback). Modifying
 107  * anything raises a _big_ probability for your system to hang, but the
 108  * sacrifice worths. (I sacrificed my ext2fs many, many times...)
 109  */
 110
 111 /* This one tries to dump to console the name of almost every function called,
 112  * and many other debugging info.
 113  */
 114 #undef AURORA_DEBUG
 115
 116 /* These are the most dangerous and useful defines. They do printk() during
 117  * the interrupt processing routine(s), so if you manage to get "flooded" by
 118  * irq's, start thinking about the "Power off/on" button...
 119  */
 120 #undef AURORA_INTNORM   /* This one enables the "normal" messages, but some
 121                          * of them cause flood, so I preffered putting
 122                          * them under a define */
 123 #undef AURORA_INT_DEBUG /* This one is really bad. */
 124
 125 /* Here's something helpful: after n irq's, the board will be disabled. This
 126  * prevents irq flooding during debug (no need to think about power
 127  * off/on anymore...)
 128  */
 129 #define AURORA_FLOODPRO 10
 130
 131 /* This one helps finding which irq the board calls, in case of a strange/
 132  * unsupported board. AURORA_INT_DEBUG should be enabled, because I don't
 133  * think /proc/interrupts or any command will be available in case of an irq
 134  * flood... "allirq" is the list of all free irq's.
 135  */
 136 /*
 137 #define AURORA_ALLIRQ 6
 138 int allirq[AURORA_ALLIRQ]={
 139         2,3,5,7,9,13
 140         };
 141 */
 142
 143 /* These must not be modified. These values are assumed during the code for
 144  * performance optimisations.
 145  */
 146 #define AURORA_NCD180 2 /* two chips per board */
 147 #define AURORA_NPORT 8  /* 8 ports per chip */
 148
 149 /* several utilities */
 150 #define AURORA_BOARD(line)      (((line) >> 4) & 0x01)
 151 #define AURORA_CD180(line)      (((line) >> 3) & 0x01)
 152 #define AURORA_PORT(line)       ((line) & 15)
 153
 154 #define AURORA_TNPORTS (AURORA_NBOARD*AURORA_NCD180*AURORA_NPORT)
 155
 156 /* Ticks per sec. Used for setting receiver timeout and break length */
 157 #define AURORA_TPS              4000
 158
 159 #define AURORA_MAGIC    0x0A18
 160
 161 /* Yeah, after heavy testing I decided it must be 6.
 162  * Sure, You can change it if needed.
 163  */
 164 #define AURORA_RXFIFO           6       /* Max. receiver FIFO size (1-8) */
 165
 166 #define AURORA_RXTH             7
 167
 168 struct aurora_reg1 {
 169         __volatile__ unsigned char r;
 170 };
 171
 172 struct aurora_reg128 {
 173         __volatile__ unsigned char r[128];
 174 };
 175
 176 struct aurora_reg4 {
 177         __volatile__ unsigned char r[4];
 178 };
 179
 180 struct Aurora_board {
 181         unsigned long           flags;
 182         struct aurora_reg1      * r0;   /* This is the board configuration
 183                                          * register (write-only). */
 184         struct aurora_reg128    * r[2]; /* These are the registers for the
 185                                          * two chips. */
 186         struct aurora_reg4      * r3;   /* These are used for hardware-based
 187                                          * acknowledge. Software-based ack is
 188                                          * not supported by CD180. */
 189         unsigned int            oscfreq; /* The on-board oscillator
 190                                           * frequency, in Hz. */
 191         unsigned char           irq;
 192 #ifdef MODULE
 193         signed char             count;  /* counts the use of the board */
 194 #endif
 195         /* Values for the dtr_rts swapped mode. */
 196         unsigned char           DTR;
 197         unsigned char           RTS;
 198         unsigned char           MSVDTR;
 199         unsigned char           MSVRTS;
 200         /* Values for hardware acknowledge. */
 201         unsigned char           ACK_MINT, ACK_TINT, ACK_RINT;
 202 };
 203
 204 /* Board configuration register */
 205 #define AURORA_CFG_ENABLE_IO    8
 206 #define AURORA_CFG_ENABLE_IRQ   4
 207
 208 /* Board flags */
 209 #define AURORA_BOARD_PRESENT            0x00000001
 210 #define AURORA_BOARD_ACTIVE             0x00000002
 211 #define AURORA_BOARD_TYPE_2             0x00000004      /* don't know how to
 212                                                          * detect this yet */
 213 #define AURORA_BOARD_DTR_FLOW_OK        0x00000008
 214
 215 /* The story goes like this: Cirrus programmed the CD-180 chip to do automatic
 216  * hardware flow control, and do it using CTS and DTR. CTS is ok, but, if you
 217  * have a modem and the chip drops DTR, then the modem will drop the carrier
 218  * (ain't that cute...). Luckily, the guys at Aurora decided to swap DTR and
 219  * RTS, which makes the flow control usable. I hope that all the boards made
 220  * by Aurora have these two signals swapped. If your's doesn't but you have a
 221  * breakout box, you can try to reverse them yourself, then set the following
 222  * flag.
 223  */
 224 #undef AURORA_FORCE_DTR_FLOW
 225
 226 /* In fact, a few more words have to be said about hardware flow control.
 227  * This driver handles "output" flow control through the on-board facility
 228  * CTS Auto Enable. For the "input" flow control there are two cases when
 229  * the flow should be controlled. The first case is when the kernel is so
 230  * busy that it cannot process IRQ's in time; this flow control can only be
 231  * activated by the on-board chip, and if the board has RTS and DTR swapped,
 232  * this facility is usable. The second case is when the application is so
 233  * busy that it cannot receive bytes from the kernel, and this flow must be
 234  * activated by software. This second case is not yet implemented in this
 235  * driver. Unfortunately, I estimate that the second case is the one that
 236  * occurs the most.
 237  */
 238
 239
 240 struct Aurora_port {
 241         int                     magic;
 242         int                     baud_base;
 243         int                     flags;
 244         struct tty_struct       * tty;
 245         int                     count;
 246         int                     blocked_open;
 247         long                    event;
 248         int                     timeout;
 249         int                     close_delay;
 250         unsigned char           * xmit_buf;
 251         int                     custom_divisor;
 252         int                     xmit_head;
 253         int                     xmit_tail;
 254         int                     xmit_cnt;
 255         wait_queue_head_t       open_wait;
 256         wait_queue_head_t       close_wait;
 257         struct tq_struct        tqueue;
 258         struct tq_struct        tqueue_hangup;
 259         short                   wakeup_chars;
 260         short                   break_length;
 261         unsigned short          closing_wait;
 262         unsigned char           mark_mask;
 263         unsigned char           SRER;
 264         unsigned char           MSVR;
 265         unsigned char           COR2;
 266 #ifdef AURORA_REPORT_OVERRUN
 267         unsigned long           overrun;
 268 #endif
 269 #ifdef AURORA_REPORT_FIFO
 270         unsigned long           hits[10];
 271 #endif
 272 };
 273
 274 #endif
 275 #endif /*__LINUX_AURORA_H*/
 276