root/drivers/char/ftape/fc-10.c

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DEFINITIONS

This source file includes following definitions.
  1. fc10_enable
   1 /* Yo, Emacs! we're -*- Linux-C -*-
   2  *
   3  
   4    Copyright (C) 1993,1994 Jon Tombs.
   5 
   6    This program is distributed in the hope that it will be useful,
   7    but WITHOUT ANY WARRANTY; without even the implied warranty of
   8    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9    GNU General Public License for more details.
  10 
  11    The entire guts of this program was written by dosemu, modified to
  12    record reads and writes to the ports in the 0x180-0x188 address space,
  13    while running the CMS program TAPE.EXE V2.0.5 supplied with the drive.
  14 
  15    Modified to use an array of addresses and generally cleaned up (made
  16    much shorter) 4 June 94, dosemu isn't that good at writing short code it
  17    would seem :-). Made independant of 0x180, but I doubt it will work
  18    at any other address.
  19 
  20    Modified for distribution with ftape source. 21 June 94, SJL.
  21 
  22    Modifications on 20 October 95, by Daniel Cohen (catman@wpi.edu):
  23    Modified to support different DMA, IRQ, and IO Ports.  Borland's
  24    Turbo Debugger in virtual 8086 mode (TD386.EXE with hardware breakpoints
  25    provided by the TDH386.SYS Device Driver) was used on the CMS program
  26    TAPE V4.0.5.  I set breakpoints on I/O to ports 0x180-0x187.  Note that
  27    CMS's program will not successfully configure the tape drive if you set
  28    breakpoints on IO Reads, but you can set them on IO Writes without problems.
  29    Known problems:
  30    - You can not use DMA Channels 5 or 7.
  31 
  32    Modification on 29 January 96, by Daniel Cohen (catman@wpi.edu):
  33    Modified to only accept IRQs 3 - 7, or 9.  Since we can only send a 3 bit
  34    number representing the IRQ to the card, special handling is required when
  35    IRQ 9 is selected.  IRQ 2 and 9 are the same, and we should request IRQ 9
  36    from the kernel while telling the card to use IRQ 2.  Thanks to Greg
  37    Crider (gcrider@iclnet.org) for finding and locating this bug, as well as
  38    testing the patch.
  39 
  40  *
  41  *      This file contains code for the CMS FC-10/FC-20 card.
  42  */
  43 
  44 #include <linux/ftape.h>
  45 #include <asm/io.h>
  46 
  47 #include "tracing.h"
  48 #include "fdc-io.h"
  49 #include "fc-10.h"
  50 
  51 #ifdef PROBE_FC10
  52 
  53 /*  This code will only work if the FC-10 (or FC-20) is set to
  54  *  use DMA channels 1, 2, or 3.  DMA channels 5 and 7 seem to be 
  55  *  initialized by the same command as channels 1 and 3, respectively.
  56  */
  57 #if (FDC_DMA > 3)
  58 #error : The FC-10/20 must be set to use DMA channels 1, 2, or 3!
  59 #endif
  60 
  61 /*  Only allow the FC-10/20 to use IRQ 3-7, or 9.  Note that CMS's program
  62  *  only accepts IRQ's 2-7, but in linux, IRQ 2 is the same as IRQ 9.
  63  */
  64 #if (FDC_IRQ < 3 || FDC_IRQ == 8 || FDC_IRQ > 9)
  65 #error : The FC-10/20 must be set to use IRQ levels 3 - 7, or 9!
  66 #error :              Note IRQ 9 is the same as IRQ 2
  67 #endif
  68 
  69 unsigned short inbs_magic[] = {
  70         0x3, 0x3, 0x0, 0x4, 0x7, 0x2, 0x5, 0x3, 0x1, 0x4,
  71         0x3, 0x5, 0x2, 0x0, 0x3, 0x7, 0x4, 0x2,
  72         0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7
  73 };
  74 
  75 unsigned short fc10_ports[] = {
  76         0x180, 0x210, 0x2A0, 0x300, 0x330, 0x340, 0x370
  77 };
  78 
  79 int fc10_enable(void)
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  80 {
  81         int i;
  82         byte cardConfig = 0x00;
  83         byte x;
  84 
  85         /*  Clear state machine ???
  86          */
  87         for (i = 0; i < NR_ITEMS(inbs_magic); i++) {
  88                 inb(FDC_BASE + inbs_magic[i]);
  89         }
  90         outb(0x0, FDC_BASE);
  91 
  92         x = inb(FDC_BASE);
  93         if (x == 0x13 || x == 0x93) {
  94                 for (i = 1; i < 8; i++) {
  95                         if (inb(FDC_BASE + i) != x) {
  96                                 return 0;
  97                         }
  98                 }
  99         } else {
 100                 return 0;
 101         }
 102 
 103         outb(0x8, FDC_BASE);
 104 
 105         for (i = 0; i < 8; i++) {
 106                 if (inb(FDC_BASE + i) != 0x0) {
 107                         return 0;
 108                 }
 109         }
 110         outb(0x10, FDC_BASE);
 111 
 112         for (i = 0; i < 8; i++) {
 113                 if (inb(FDC_BASE + i) != 0xff) {
 114                         return 0;
 115                 }
 116         }
 117 
 118         /*  Okay, we found a FC-10 card ! ???
 119          */
 120         outb(0x0, fdc.ccr);
 121 
 122         /*  Clear state machine again ???
 123          */
 124         for (i = 0; i < NR_ITEMS(inbs_magic); i++) {
 125                 inb(FDC_BASE + inbs_magic[i]);
 126         }
 127         /* Send io port */
 128         for (i = 0; i < NR_ITEMS(fc10_ports); i++)
 129                 if (FDC_BASE == fc10_ports[i])
 130                         cardConfig = i + 1;
 131         if (cardConfig == 0)
 132                 return 0;       /* Invalid I/O Port */
 133         /* and IRQ - If using IRQ 9, tell the FC card it is actually IRQ 2 */
 134         if (FDC_IRQ != 9)
 135                 cardConfig |= FDC_IRQ << 3;
 136         else
 137                 cardConfig |= 2 << 3;
 138 
 139         /* and finally DMA Channel */
 140         cardConfig |= FDC_DMA << 6;
 141         outb(cardConfig, FDC_BASE);     /* DMA [2 bits]/IRQ [3 bits]/BASE [3 bits] */
 142 
 143         /*  Enable FC-10 ???
 144          */
 145         outb(0, fdc.ccr);
 146         outb(0, FDC_BASE + 0x6);
 147         outb(8, fdc.dor);
 148         outb(8, fdc.dor);
 149         outb(1, FDC_BASE + 0x6);
 150 
 151         /*  Initialize fdc, select drive B:
 152          */
 153         outb(0x08, fdc.dor);    /* assert reset, dma & irq enabled */
 154         outb(0x0c, fdc.dor);    /* release reset */
 155         outb(0x2d, fdc.dor);    /* select drive 1 */
 156 
 157         return (x == 0x93) ? 2 : 1;
 158 }
 159 
 160 #endif /* CMS_FC10_CONTROLLER */
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