341 lines
7 KiB
C
341 lines
7 KiB
C
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/*
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epat.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
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Under the terms of the GNU General Public License.
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This is the low level protocol driver for the EPAT parallel
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to IDE adapter from Shuttle Technologies. This adapter is
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used in many popular parallel port disk products such as the
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SyQuest EZ drives, the Avatar Shark and the Imation SuperDisk.
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*/
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/* Changes:
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1.01 GRG 1998.05.06 init_proto, release_proto
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1.02 Joshua b. Jore CPP(renamed), epat_connect, epat_disconnect
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*/
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#define EPAT_VERSION "1.02"
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include <asm/io.h>
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#include "paride.h"
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#define j44(a,b) (((a>>4)&0x0f)+(b&0xf0))
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#define j53(a,b) (((a>>3)&0x1f)+((b<<4)&0xe0))
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static int epatc8;
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module_param(epatc8, int, 0);
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MODULE_PARM_DESC(epatc8, "support for the Shuttle EP1284 chip, "
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"used in any recent Imation SuperDisk (LS-120) drive.");
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/* cont = 0 IDE register file
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cont = 1 IDE control registers
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cont = 2 internal EPAT registers
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*/
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static int cont_map[3] = { 0x18, 0x10, 0 };
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static void epat_write_regr( PIA *pi, int cont, int regr, int val)
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{ int r;
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r = regr + cont_map[cont];
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switch (pi->mode) {
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case 0:
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case 1:
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case 2: w0(0x60+r); w2(1); w0(val); w2(4);
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break;
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case 3:
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case 4:
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case 5: w3(0x40+r); w4(val);
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break;
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}
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}
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static int epat_read_regr( PIA *pi, int cont, int regr )
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{ int a, b, r;
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r = regr + cont_map[cont];
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switch (pi->mode) {
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case 0: w0(r); w2(1); w2(3);
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a = r1(); w2(4); b = r1();
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return j44(a,b);
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case 1: w0(0x40+r); w2(1); w2(4);
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a = r1(); b = r2(); w0(0xff);
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return j53(a,b);
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case 2: w0(0x20+r); w2(1); w2(0x25);
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a = r0(); w2(4);
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return a;
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case 3:
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case 4:
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case 5: w3(r); w2(0x24); a = r4(); w2(4);
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return a;
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}
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return -1; /* never gets here */
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}
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static void epat_read_block( PIA *pi, char * buf, int count )
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{ int k, ph, a, b;
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switch (pi->mode) {
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case 0: w0(7); w2(1); w2(3); w0(0xff);
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ph = 0;
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for(k=0;k<count;k++) {
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if (k == count-1) w0(0xfd);
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w2(6+ph); a = r1();
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if (a & 8) b = a;
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else { w2(4+ph); b = r1(); }
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buf[k] = j44(a,b);
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ph = 1 - ph;
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}
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w0(0); w2(4);
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break;
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case 1: w0(0x47); w2(1); w2(5); w0(0xff);
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ph = 0;
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for(k=0;k<count;k++) {
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if (k == count-1) w0(0xfd);
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w2(4+ph);
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a = r1(); b = r2();
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buf[k] = j53(a,b);
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ph = 1 - ph;
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}
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w0(0); w2(4);
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break;
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case 2: w0(0x27); w2(1); w2(0x25); w0(0);
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ph = 0;
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for(k=0;k<count-1;k++) {
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w2(0x24+ph);
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buf[k] = r0();
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ph = 1 - ph;
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}
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w2(0x26); w2(0x27); buf[count-1] = r0();
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w2(0x25); w2(4);
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break;
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case 3: w3(0x80); w2(0x24);
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for(k=0;k<count-1;k++) buf[k] = r4();
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w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
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w2(4);
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break;
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case 4: w3(0x80); w2(0x24);
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for(k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w();
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buf[count-2] = r4();
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w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
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w2(4);
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break;
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case 5: w3(0x80); w2(0x24);
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for(k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l();
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for(k=count-4;k<count-1;k++) buf[k] = r4();
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w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
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w2(4);
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break;
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}
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}
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static void epat_write_block( PIA *pi, char * buf, int count )
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{ int ph, k;
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switch (pi->mode) {
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case 0:
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case 1:
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case 2: w0(0x67); w2(1); w2(5);
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ph = 0;
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for(k=0;k<count;k++) {
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w0(buf[k]);
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w2(4+ph);
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ph = 1 - ph;
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}
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w2(7); w2(4);
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break;
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case 3: w3(0xc0);
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for(k=0;k<count;k++) w4(buf[k]);
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w2(4);
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break;
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case 4: w3(0xc0);
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for(k=0;k<(count/2);k++) w4w(((u16 *)buf)[k]);
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w2(4);
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break;
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case 5: w3(0xc0);
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for(k=0;k<(count/4);k++) w4l(((u32 *)buf)[k]);
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w2(4);
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break;
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}
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}
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/* these macros access the EPAT registers in native addressing */
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#define WR(r,v) epat_write_regr(pi,2,r,v)
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#define RR(r) (epat_read_regr(pi,2,r))
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/* and these access the IDE task file */
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#define WRi(r,v) epat_write_regr(pi,0,r,v)
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#define RRi(r) (epat_read_regr(pi,0,r))
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/* FIXME: the CPP stuff should be fixed to handle multiple EPATs on a chain */
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#define CPP(x) w2(4);w0(0x22);w0(0xaa);w0(0x55);w0(0);w0(0xff);\
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w0(0x87);w0(0x78);w0(x);w2(4);w2(5);w2(4);w0(0xff);
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static void epat_connect ( PIA *pi )
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{ pi->saved_r0 = r0();
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pi->saved_r2 = r2();
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/* Initialize the chip */
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CPP(0);
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if (epatc8) {
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CPP(0x40);CPP(0xe0);
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w0(0);w2(1);w2(4);
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WR(0x8,0x12);WR(0xc,0x14);WR(0x12,0x10);
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WR(0xe,0xf);WR(0xf,4);
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/* WR(0xe,0xa);WR(0xf,4); */
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WR(0xe,0xd);WR(0xf,0);
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/* CPP(0x30); */
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}
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/* Connect to the chip */
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CPP(0xe0);
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w0(0);w2(1);w2(4); /* Idle into SPP */
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if (pi->mode >= 3) {
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w0(0);w2(1);w2(4);w2(0xc);
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/* Request EPP */
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w0(0x40);w2(6);w2(7);w2(4);w2(0xc);w2(4);
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}
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if (!epatc8) {
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WR(8,0x10); WR(0xc,0x14); WR(0xa,0x38); WR(0x12,0x10);
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}
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}
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static void epat_disconnect (PIA *pi)
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{ CPP(0x30);
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w0(pi->saved_r0);
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w2(pi->saved_r2);
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}
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static int epat_test_proto( PIA *pi, char * scratch, int verbose )
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{ int k, j, f, cc;
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int e[2] = {0,0};
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epat_connect(pi);
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cc = RR(0xd);
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epat_disconnect(pi);
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epat_connect(pi);
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for (j=0;j<2;j++) {
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WRi(6,0xa0+j*0x10);
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for (k=0;k<256;k++) {
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WRi(2,k^0xaa);
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WRi(3,k^0x55);
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if (RRi(2) != (k^0xaa)) e[j]++;
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}
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}
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epat_disconnect(pi);
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f = 0;
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epat_connect(pi);
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WR(0x13,1); WR(0x13,0); WR(0xa,0x11);
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epat_read_block(pi,scratch,512);
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for (k=0;k<256;k++) {
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if ((scratch[2*k] & 0xff) != k) f++;
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if ((scratch[2*k+1] & 0xff) != (0xff-k)) f++;
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}
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epat_disconnect(pi);
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if (verbose) {
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printk("%s: epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)\n",
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pi->device,pi->port,pi->mode,cc,e[0],e[1],f);
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}
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return (e[0] && e[1]) || f;
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}
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static void epat_log_adapter( PIA *pi, char * scratch, int verbose )
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{ int ver;
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char *mode_string[6] =
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{"4-bit","5/3","8-bit","EPP-8","EPP-16","EPP-32"};
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epat_connect(pi);
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WR(0xa,0x38); /* read the version code */
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ver = RR(0xb);
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epat_disconnect(pi);
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printk("%s: epat %s, Shuttle EPAT chip %x at 0x%x, ",
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pi->device,EPAT_VERSION,ver,pi->port);
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printk("mode %d (%s), delay %d\n",pi->mode,
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mode_string[pi->mode],pi->delay);
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}
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static struct pi_protocol epat = {
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.owner = THIS_MODULE,
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.name = "epat",
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.max_mode = 6,
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.epp_first = 3,
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.default_delay = 1,
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.max_units = 1,
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.write_regr = epat_write_regr,
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.read_regr = epat_read_regr,
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.write_block = epat_write_block,
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.read_block = epat_read_block,
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.connect = epat_connect,
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.disconnect = epat_disconnect,
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.test_proto = epat_test_proto,
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.log_adapter = epat_log_adapter,
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};
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static int __init epat_init(void)
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{
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#ifdef CONFIG_PARIDE_EPATC8
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epatc8 = 1;
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#endif
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return paride_register(&epat);
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}
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static void __exit epat_exit(void)
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{
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paride_unregister(&epat);
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}
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MODULE_LICENSE("GPL");
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module_init(epat_init)
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module_exit(epat_exit)
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