| 1 | /* ------------------------------------------------------------------------- */ |
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| 2 | /* pcf-lp.c i2c-hw access for PCF 8584 on bidir. parallel ports */ |
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| 3 | /* ------------------------------------------------------------------------- */ |
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| 4 | /* |
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| 5 | -----.-.---....------..-.-.---.... Oh bugger! Hope it works this time...... |
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| 6 | |
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| 7 | Copyright (C) 1995-97 Simon G. Vogl |
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| 8 | |
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| 9 | This program is free software; you can redistribute it and/or modify |
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| 10 | it under the terms of the GNU General Public License as published by |
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| 11 | the Free Software Foundation; either version 2 of the License, or |
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| 12 | (at your option) any later version. |
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| 13 | |
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| 14 | This program is distributed in the hope that it will be useful, |
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| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | GNU General Public License for more details. |
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| 18 | |
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| 19 | You should have received a copy of the GNU General Public License |
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| 20 | along with this program; if not, write to the Free Software |
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| 21 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
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| 22 | /* ------------------------------------------------------------------------- */ |
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| 23 | static char rcsid[] = "$Id: pcf-lp.c,v 1.1 1998/09/05 18:20:09 i2c Exp $"; |
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| 24 | /* |
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| 25 | * $Log: pcf-lp.c,v $ |
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| 26 | * Revision 1.1 1998/09/05 18:20:09 i2c |
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| 27 | * Initial revision |
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| 28 | * |
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| 29 | * Revision 1.4 1998/01/20 10:01:29 i2c |
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| 30 | * *** empty log message *** |
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| 31 | * |
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| 32 | * Revision 1.3 1997/06/15 14:21:37 i2c |
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| 33 | * removed debugging messages |
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| 34 | * |
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| 35 | * Revision 1.2 1997/06/03 06:00:10 i2c |
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| 36 | * first version that works |
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| 37 | * |
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| 38 | * Revision 1.2 1996/11/20 20:20:46 i2c |
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| 39 | * first version for ISA bus. |
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| 40 | * |
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| 41 | * Revision 1.1 1996/11/17 11:00:03 i2c |
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| 42 | * Initial revision |
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| 43 | * |
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| 44 | * |
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| 45 | */ |
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| 46 | |
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| 47 | #include <linux/kernel.h> |
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| 48 | #include <linux/delay.h> |
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| 49 | #include <linux/ioport.h> |
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| 50 | #include <asm/io.h> |
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| 51 | #include <linux/errno.h> |
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| 52 | |
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| 53 | #include "i2c.h" |
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| 54 | #include "i2c-priv.h" |
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| 55 | |
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| 56 | /* ----- global defines ----------------------------------------------- */ |
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| 57 | #define DEB(x) /* should be reasonable open, close &c. */ |
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| 58 | #define DEB2(x) /* low level debugging - very slow */ |
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| 59 | #define DEBE(x) x /* error messages */ |
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| 60 | |
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| 61 | #define DEBHW(x) x /* lowest level hardware debug -- log changes of*/ |
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| 62 | /* the bit lines... */ |
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| 63 | |
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| 64 | #define lpPort(port) (i2c_table[minor].base+(port)) |
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| 65 | |
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| 66 | |
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| 67 | /* ----- local variables ---------------------------------------------- */ |
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| 68 | |
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| 69 | static unsigned char ctrl; /* remember line states */ |
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| 70 | |
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| 71 | /* (re)set line states */ |
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| 72 | #define Strobe(arg) if (!arg) ctrl|= 0x01; else ctrl &=!0x01;\ |
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| 73 | outb_p(ctrl,lpPort(2)) /* Strobe -- pin 1 */ |
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| 74 | #define AutoLF(arg) if (!arg) ctrl|= 0x02; else ctrl &=!0x02;\ |
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| 75 | outb_p(ctrl,lpPort(2)) /* AutoLF -- pin 14 */ |
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| 76 | #define Init(arg) if ( arg) ctrl|= 0x04; else ctrl &=!0x04;\ |
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| 77 | outb(ctrl,lpPort(2)) /* Init -- pin 16 */ |
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| 78 | #define Select(arg) if (!arg) ctrl|= 0x08; else ctrl &=!0x08;\ |
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| 79 | outb_p(ctrl,lpPort(2)) /* Sel. in - pin 17 */ |
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| 80 | /* 0x10 -- Int Enable */ |
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| 81 | #define ReadBit(arg) if(arg) ctrl|= 0x20; else ctrl &=!0x20;\ |
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| 82 | outb_p(ctrl,lpPort(2)) /* direction bit */ |
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| 83 | |
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| 84 | #define inStr() (! (0x01 & inb(lpPort(2)) ) ) /* Strobe -- pin 1 */ |
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| 85 | #define inALF() (! (0x02 & inb(lpPort(2)) ) ) /* AutoLF -- pin 14 */ |
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| 86 | #define inIni() ( (0x04 & inb(lpPort(2)) ) ) /* Init -- pin 16 */ |
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| 87 | #define inSel() (! (0x08 & inb(lpPort(2)) ) ) /* Sel. in - pin 17 */ |
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| 88 | /* 0x10 -- Int Enable */ |
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| 89 | /* |
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| 90 | #define Argl() printk("(wr-%d cs-%d a0-%d (%#2x, %#2x))\n", \ |
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| 91 | inStr(),inALF(),inIni(),inb(lpPort(0)),inb(lpPort(1)) ) |
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| 92 | */ |
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| 93 | #define Argl() /**/ |
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| 94 | |
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| 95 | #define wr(arg) Strobe(arg); Argl() /* write line */ |
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| 96 | #define cs(arg) AutoLF(arg); Argl() /* chip select */ |
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| 97 | #define a0(arg) Init (arg); Argl() /* address line */ |
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| 98 | |
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| 99 | /* ----- local functions ---------------------------------------------- */ |
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| 100 | /* |
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| 101 | #if (PCFADAPS) > 1 |
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| 102 | # define Local static |
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| 103 | #else |
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| 104 | # define Local inline |
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| 105 | #endif |
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| 106 | */ |
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| 107 | #define Local /**/ |
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| 108 | |
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| 109 | /* --------- okay, I borrowed it. Stays here for debugging. |
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| 110 | * check the epp status. After a EPP transfer, it should be true that |
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| 111 | * 1) the TIMEOUT bit (SPP_STR.0) is clear |
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| 112 | * 2) the READY bit (SPP_STR.7) is set |
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| 113 | * returns 1 if okay |
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| 114 | */ |
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| 115 | static int ex_ppa_check_epp_status(int minor) |
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| 116 | { |
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| 117 | char r; |
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| 118 | inb(STAT); |
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| 119 | r = inb(STAT); |
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| 120 | |
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| 121 | if (r & 1) { |
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| 122 | outb(r, STAT); |
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| 123 | outb(r&0xfe, STAT); |
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| 124 | printk("timed out on port 0x%04x\n", BASE); |
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| 125 | return 0; |
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| 126 | } |
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| 127 | if (!(r & 0x80)) { |
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| 128 | return 0; |
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| 129 | } |
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| 130 | return 1; |
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| 131 | } |
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| 132 | |
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| 133 | |
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| 134 | Local int pcf_read (int minor, int adr) |
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| 135 | { |
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| 136 | int ret; |
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| 137 | a0(adr); |
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| 138 | ex_ppa_check_epp_status(minor); |
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| 139 | ret = inb(lpPort(4)); |
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| 140 | return ret; |
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| 141 | } |
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| 142 | |
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| 143 | |
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| 144 | Local void pcf_write (int minor, int adr,char data) |
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| 145 | { |
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| 146 | a0(adr); |
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| 147 | ex_ppa_check_epp_status(minor); |
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| 148 | outb(data,lpPort(4)); |
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| 149 | } |
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| 150 | |
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| 151 | |
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| 152 | Local int pcf_init (int minor) |
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| 153 | { |
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| 154 | char ctrl,ecr; /* parallel port registers */ |
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| 155 | |
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| 156 | if (check_region(i2c_table[minor].base, 8) < 0 ) { |
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| 157 | return -ENODEV; |
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| 158 | } else { |
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| 159 | request_region(i2c_table[minor].base, 8, "i2c (pcf-lp)"); |
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| 160 | } |
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| 161 | |
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| 162 | /* This is the standard detection algorithm for ECP ports */ |
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| 163 | /* now detect, what kind of parallel port we have: */ |
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| 164 | ecr = inb(i2c_table[minor].base+0x402); |
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| 165 | ctrl= inb(i2c_table[minor].base+0x002); |
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| 166 | if (ecr!=ctrl) { /* Okay, we seem to have an extended port :) */ |
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| 167 | if (check_region(i2c_table[minor].base + 0x400, 8) < 0 ) { |
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| 168 | DEBE(printk( "i2c_init, port %#x: ext. ports already in use " |
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| 169 | "using only standard driver.\n", |
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| 170 | i2c_table[minor].base)); |
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| 171 | return -ENODEV; |
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| 172 | } else { |
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| 173 | if ( (ecr & 0x03) != 0x01 ) { /* FIFO empty? */ |
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| 174 | printk("FIFO not empty\n"); |
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| 175 | return -ENODEV; |
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| 176 | } |
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| 177 | |
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| 178 | outb(0x34,i2c_table[minor].base+0x402); |
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| 179 | if (inb(i2c_table[minor].base+0x402) != 0x35 ){ /* bits 0,1 readonly */ |
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| 180 | printk("bits 0,1 not rd/only"); |
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| 181 | return -ENODEV; |
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| 182 | } |
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| 183 | /* Okay, now we should have an ECP-capable printer port */ |
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| 184 | printk("i2c%d: ECP parallel port.\n",minor); |
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| 185 | request_region(i2c_table[minor].base+0x0400, 3 , |
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| 186 | "i2c (Extended Parallel port adapter)"); |
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| 187 | outb(0x94 ,lpPort(0x402)); /* EPP mode */ |
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| 188 | ctrl = inb(CTRL); |
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| 189 | |
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| 190 | if (i2c_table[minor].irq > 0){ /* enable int. */ |
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| 191 | outb(inb(lpPort(0x402)|0x10), lpPort(0x402)); |
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| 192 | outb(ctrl|0x10,CTRL); |
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| 193 | } |
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| 194 | |
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| 195 | ex_ppa_check_epp_status(minor); |
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| 196 | printk("status reads %2x\n",pcf_read(minor,1)); |
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| 197 | ex_ppa_check_epp_status(minor); |
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| 198 | printk("data reads %2x\n",pcf_read(minor,0)); |
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| 199 | } |
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| 200 | } else { |
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| 201 | printk("i2c%d: Need EPP port. Sorry.\n",minor); |
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| 202 | return -ENODEV; |
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| 203 | } |
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| 204 | /* Okay, now it's time to init my data structures */ |
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| 205 | |
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| 206 | return 0; |
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| 207 | } |
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| 208 | |
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| 209 | |
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| 210 | Local void pcf_exit (int minor) |
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| 211 | { |
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| 212 | release_region( i2c_table[minor].base, 8 ); |
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| 213 | release_region( i2c_table[minor].base + 0x0400, 3 ); |
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| 214 | } |
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| 215 | |
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| 216 | |
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| 217 | /* ------------------------------------------------------------------------ |
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| 218 | * Encapsulate the above functions in the correct operations structure. |
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| 219 | * This is only done when more than one hardware adapter is supported. |
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| 220 | */ |
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| 221 | #if (PCFADAPS) > 1 |
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| 222 | struct i2c_pcf_ops pcf_lp_ops = { |
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| 223 | pcf_read, |
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| 224 | pcf_write, |
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| 225 | pcf_init, |
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| 226 | pcf_exit |
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| 227 | }; |
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| 228 | #endif |
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