-/*
- epat.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
- Under the terms of the GNU General Public License.
-
- This is the low level protocol driver for the EPAT parallel
- to IDE adapter from Shuttle Technologies. This adapter is
- used in many popular parallel port disk products such as the
- SyQuest EZ drives, the Avatar Shark and the Imation SuperDisk.
-
-*/
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * (c) 1997-1998 Grant R. Guenther <grant@torque.net>
+ *
+ * This is the low level protocol driver for the EPAT parallel
+ * to IDE adapter from Shuttle Technologies. This adapter is
+ * used in many popular parallel port disk products such as the
+ * SyQuest EZ drives, the Avatar Shark and the Imation SuperDisk.
+ */
#include <linux/module.h>
#include <linux/init.h>
#include <asm/io.h>
#include "pata_parport.h"
-#define j44(a,b) (((a>>4)&0x0f)+(b&0xf0))
-#define j53(a,b) (((a>>3)&0x1f)+((b<<4)&0xe0))
+#define j44(a, b) (((a >> 4) & 0x0f) + (b & 0xf0))
+#define j53(a, b) (((a >> 3) & 0x1f) + ((b << 4) & 0xe0))
static int epatc8;
module_param(epatc8, int, 0);
-MODULE_PARM_DESC(epatc8, "support for the Shuttle EP1284 chip, "
- "used in any recent Imation SuperDisk (LS-120) drive.");
-
-/* cont = 0 IDE register file
- cont = 1 IDE control registers
- cont = 2 internal EPAT registers
-*/
-
+MODULE_PARM_DESC(epatc8,
+ "support for the Shuttle EP1284 chip, "
+ "used in any recent Imation SuperDisk (LS-120) drive.");
+
+/*
+ * cont = 0 IDE register file
+ * cont = 1 IDE control registers
+ * cont = 2 internal EPAT registers
+ */
static int cont_map[3] = { 0x18, 0x10, 0 };
static void epat_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
-
-{ int r;
-
- r = regr + cont_map[cont];
+{
+ int r = regr + cont_map[cont];
switch (pi->mode) {
-
case 0:
case 1:
- case 2: w0(0x60+r); w2(1); w0(val); w2(4);
+ case 2:
+ w0(0x60+r); w2(1); w0(val); w2(4);
break;
-
case 3:
case 4:
- case 5: w3(0x40+r); w4(val);
+ case 5:
+ w3(0x40+r); w4(val);
break;
-
}
}
static int epat_read_regr(struct pi_adapter *pi, int cont, int regr)
-
-{ int a, b, r;
+{
+ int a, b, r;
r = regr + cont_map[cont];
switch (pi->mode) {
- case 0: w0(r); w2(1); w2(3);
+ case 0:
+ w0(r); w2(1); w2(3);
a = r1(); w2(4); b = r1();
- return j44(a,b);
-
- case 1: w0(0x40+r); w2(1); w2(4);
+ return j44(a, b);
+ case 1:
+ w0(0x40+r); w2(1); w2(4);
a = r1(); b = r2(); w0(0xff);
- return j53(a,b);
-
- case 2: w0(0x20+r); w2(1); w2(0x25);
+ return j53(a, b);
+ case 2:
+ w0(0x20+r); w2(1); w2(0x25);
a = r0(); w2(4);
return a;
-
case 3:
case 4:
- case 5: w3(r); w2(0x24); a = r4(); w2(4);
+ case 5:
+ w3(r); w2(0x24); a = r4(); w2(4);
return a;
-
}
+
return -1; /* never gets here */
}
static void epat_read_block(struct pi_adapter *pi, char *buf, int count)
-
-{ int k, ph, a, b;
+{
+ int k, ph, a, b;
switch (pi->mode) {
- case 0: w0(7); w2(1); w2(3); w0(0xff);
+ case 0:
+ w0(7); w2(1); w2(3); w0(0xff);
ph = 0;
- for(k=0;k<count;k++) {
- if (k == count-1) w0(0xfd);
- w2(6+ph); a = r1();
- if (a & 8) b = a;
- else { w2(4+ph); b = r1(); }
- buf[k] = j44(a,b);
+ for (k = 0; k < count; k++) {
+ if (k == count-1)
+ w0(0xfd);
+ w2(6 + ph); a = r1();
+ if (a & 8) {
+ b = a;
+ } else {
+ w2(4+ph); b = r1();
+ }
+ buf[k] = j44(a, b);
ph = 1 - ph;
}
w0(0); w2(4);
break;
- case 1: w0(0x47); w2(1); w2(5); w0(0xff);
+ case 1:
+ w0(0x47); w2(1); w2(5); w0(0xff);
ph = 0;
- for(k=0;k<count;k++) {
- if (k == count-1) w0(0xfd);
- w2(4+ph);
+ for (k = 0; k < count; k++) {
+ if (k == count - 1)
+ w0(0xfd);
+ w2(4 + ph);
a = r1(); b = r2();
- buf[k] = j53(a,b);
+ buf[k] = j53(a, b);
ph = 1 - ph;
}
w0(0); w2(4);
break;
- case 2: w0(0x27); w2(1); w2(0x25); w0(0);
+ case 2:
+ w0(0x27); w2(1); w2(0x25); w0(0);
ph = 0;
- for(k=0;k<count-1;k++) {
- w2(0x24+ph);
+ for (k = 0; k < count - 1; k++) {
+ w2(0x24 + ph);
buf[k] = r0();
ph = 1 - ph;
}
- w2(0x26); w2(0x27); buf[count-1] = r0();
+ w2(0x26); w2(0x27);
+ buf[count - 1] = r0();
w2(0x25); w2(4);
break;
- case 3: w3(0x80); w2(0x24);
- for(k=0;k<count-1;k++) buf[k] = r4();
- w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
+ case 3:
+ w3(0x80); w2(0x24);
+ for (k = 0; k < count - 1; k++)
+ buf[k] = r4();
+ w2(4); w3(0xa0); w2(0x24);
+ buf[count - 1] = r4();
w2(4);
break;
- case 4: w3(0x80); w2(0x24);
- for(k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w();
- buf[count-2] = r4();
- w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
+ case 4:
+ w3(0x80); w2(0x24);
+ for (k = 0; k < count / 2 - 1; k++)
+ ((u16 *)buf)[k] = r4w();
+ buf[count - 2] = r4();
+ w2(4); w3(0xa0); w2(0x24);
+ buf[count - 1] = r4();
w2(4);
break;
- case 5: w3(0x80); w2(0x24);
- for(k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l();
- for(k=count-4;k<count-1;k++) buf[k] = r4();
- w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
+ case 5:
+ w3(0x80); w2(0x24);
+ for (k = 0; k < count / 4 - 1; k++)
+ ((u32 *)buf)[k] = r4l();
+ for (k = count - 4; k < count - 1; k++)
+ buf[k] = r4();
+ w2(4); w3(0xa0); w2(0x24);
+ buf[count - 1] = r4();
w2(4);
break;
-
}
}
static void epat_write_block(struct pi_adapter *pi, char *buf, int count)
-
-{ int ph, k;
+{
+ int ph, k;
switch (pi->mode) {
-
case 0:
case 1:
- case 2: w0(0x67); w2(1); w2(5);
+ case 2:
+ w0(0x67); w2(1); w2(5);
ph = 0;
- for(k=0;k<count;k++) {
+ for (k = 0; k < count; k++) {
w0(buf[k]);
- w2(4+ph);
+ w2(4 + ph);
ph = 1 - ph;
}
w2(7); w2(4);
break;
-
- case 3: w3(0xc0);
- for(k=0;k<count;k++) w4(buf[k]);
+ case 3:
+ w3(0xc0);
+ for (k = 0; k < count; k++)
+ w4(buf[k]);
w2(4);
break;
-
- case 4: w3(0xc0);
- for(k=0;k<(count/2);k++) w4w(((u16 *)buf)[k]);
+ case 4:
+ w3(0xc0);
+ for (k = 0; k < count / 2; k++)
+ w4w(((u16 *)buf)[k]);
w2(4);
break;
-
- case 5: w3(0xc0);
- for(k=0;k<(count/4);k++) w4l(((u32 *)buf)[k]);
+ case 5:
+ w3(0xc0);
+ for (k = 0; k < count / 4; k++)
+ w4l(((u32 *)buf)[k]);
w2(4);
break;
-
}
}
/* these macros access the EPAT registers in native addressing */
-#define WR(r,v) epat_write_regr(pi,2,r,v)
-#define RR(r) (epat_read_regr(pi,2,r))
+#define WR(r, v) epat_write_regr(pi, 2, r, v)
+#define RR(r) epat_read_regr(pi, 2, r)
/* and these access the IDE task file */
-#define WRi(r,v) epat_write_regr(pi,0,r,v)
-#define RRi(r) (epat_read_regr(pi,0,r))
+#define WRi(r, v) epat_write_regr(pi, 0, r, v)
+#define RRi(r) epat_read_regr(pi, 0, r)
/* FIXME: the CPP stuff should be fixed to handle multiple EPATs on a chain */
-#define CPP(x) w2(4);w0(0x22);w0(0xaa);w0(0x55);w0(0);w0(0xff);\
- w0(0x87);w0(0x78);w0(x);w2(4);w2(5);w2(4);w0(0xff);
+#define CPP(x) \
+ do { \
+ w2(4); w0(0x22); w0(0xaa); \
+ w0(0x55); w0(0); w0(0xff); \
+ w0(0x87); w0(0x78); w0(x); \
+ w2(4); w2(5); w2(4); w0(0xff); \
+ } while (0)
static void epat_connect(struct pi_adapter *pi)
-
-{ pi->saved_r0 = r0();
- pi->saved_r2 = r2();
+{
+ pi->saved_r0 = r0();
+ pi->saved_r2 = r2();
/* Initialize the chip */
CPP(0);
if (epatc8) {
- CPP(0x40);CPP(0xe0);
- w0(0);w2(1);w2(4);
- WR(0x8,0x12);WR(0xc,0x14);WR(0x12,0x10);
- WR(0xe,0xf);WR(0xf,4);
+ CPP(0x40); CPP(0xe0);
+ w0(0); w2(1); w2(4);
+ WR(0x8, 0x12);
+ WR(0xc, 0x14);
+ WR(0x12, 0x10);
+ WR(0xe, 0xf);
+ WR(0xf, 4);
/* WR(0xe,0xa);WR(0xf,4); */
- WR(0xe,0xd);WR(0xf,0);
+ WR(0xe, 0xd);
+ WR(0xf, 0);
/* CPP(0x30); */
}
/* Connect to the chip */
CPP(0xe0);
- w0(0);w2(1);w2(4); /* Idle into SPP */
+ w0(0); w2(1); w2(4); /* Idle into SPP */
if (pi->mode >= 3) {
- w0(0);w2(1);w2(4);w2(0xc);
- /* Request EPP */
- w0(0x40);w2(6);w2(7);w2(4);w2(0xc);w2(4);
+ w0(0); w2(1); w2(4); w2(0xc);
+ /* Request EPP */
+ w0(0x40); w2(6); w2(7); w2(4); w2(0xc); w2(4);
}
if (!epatc8) {
- WR(8,0x10); WR(0xc,0x14); WR(0xa,0x38); WR(0x12,0x10);
+ WR(8, 0x10);
+ WR(0xc, 0x14);
+ WR(0xa, 0x38);
+ WR(0x12, 0x10);
}
}
static void epat_disconnect(struct pi_adapter *pi)
-{ CPP(0x30);
+{
+ CPP(0x30);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
static int epat_test_proto(struct pi_adapter *pi)
-
-{ int k, j, f, cc;
- int e[2] = {0,0};
+{
+ int k, j, f, cc;
+ int e[2] = { 0, 0 };
char scratch[512];
- epat_connect(pi);
+ epat_connect(pi);
cc = RR(0xd);
epat_disconnect(pi);
epat_connect(pi);
for (j=0;j<2;j++) {
- WRi(6,0xa0+j*0x10);
- for (k=0;k<256;k++) {
- WRi(2,k^0xaa);
- WRi(3,k^0x55);
- if (RRi(2) != (k^0xaa)) e[j]++;
- }
- }
- epat_disconnect(pi);
-
- f = 0;
- epat_connect(pi);
- WR(0x13,1); WR(0x13,0); WR(0xa,0x11);
- epat_read_block(pi,scratch,512);
-
- for (k=0;k<256;k++) {
- if ((scratch[2*k] & 0xff) != k) f++;
- if ((scratch[2*k+1] & 0xff) != (0xff-k)) f++;
- }
- epat_disconnect(pi);
+ WRi(6, 0xa0 + j * 0x10);
+ for (k = 0; k < 256; k++) {
+ WRi(2, k ^ 0xaa);
+ WRi(3, k ^ 0x55);
+ if (RRi(2) != (k ^ 0xaa))
+ e[j]++;
+ }
+ }
+ epat_disconnect(pi);
- dev_dbg(&pi->dev, "epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)\n",
- pi->port, pi->mode, cc, e[0], e[1], f);
-
- return (e[0] && e[1]) || f;
+ f = 0;
+ epat_connect(pi);
+ WR(0x13, 1); WR(0x13, 0); WR(0xa, 0x11);
+ epat_read_block(pi, scratch, 512);
+
+ for (k = 0; k < 256; k++) {
+ if ((scratch[2 * k] & 0xff) != k)
+ f++;
+ if ((scratch[2 * k + 1] & 0xff) != 0xff - k)
+ f++;
+ }
+ epat_disconnect(pi);
+
+ dev_dbg(&pi->dev,
+ "epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)\n",
+ pi->port, pi->mode, cc, e[0], e[1], f);
+
+ return (e[0] && e[1]) || f;
}
static void epat_log_adapter(struct pi_adapter *pi)
-
-{ int ver;
- char *mode_string[6] =
- {"4-bit","5/3","8-bit","EPP-8","EPP-16","EPP-32"};
+{
+ int ver;
+ char *mode_string[6] =
+ { "4-bit", "5/3", "8-bit", "EPP-8", "EPP-16", "EPP-32" };
epat_connect(pi);
- WR(0xa,0x38); /* read the version code */
- ver = RR(0xb);
- epat_disconnect(pi);
+ WR(0xa, 0x38); /* read the version code */
+ ver = RR(0xb);
+ epat_disconnect(pi);
- dev_info(&pi->dev, "Shuttle EPAT chip %x at 0x%x, mode %d (%s), delay %d\n",
+ dev_info(&pi->dev,
+ "Shuttle EPAT chip %x at 0x%x, mode %d (%s), delay %d\n",
ver, pi->port, pi->mode, mode_string[pi->mode], pi->delay);
}
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