From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 drivers/block/paride/epat.c | 340 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 340 insertions(+)
 create mode 100644 drivers/block/paride/epat.c

(limited to 'drivers/block/paride/epat.c')

diff --git a/drivers/block/paride/epat.c b/drivers/block/paride/epat.c
new file mode 100644
index 000000000..1bcdff773
--- /dev/null
+++ b/drivers/block/paride/epat.c
@@ -0,0 +1,340 @@
+/* 
+        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.
+	
+*/
+
+/* Changes:
+
+        1.01    GRG 1998.05.06 init_proto, release_proto
+        1.02    Joshua b. Jore CPP(renamed), epat_connect, epat_disconnect
+
+*/
+
+#define EPAT_VERSION      "1.02"
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <asm/io.h>
+
+#include "paride.h"
+
+#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
+*/
+
+static int cont_map[3] = { 0x18, 0x10, 0 };
+
+static void epat_write_regr( PIA *pi, int cont, int regr, int val)
+
+{	int r;
+
+	r = regr + cont_map[cont];
+
+	switch (pi->mode) {
+
+	case 0:
+	case 1:
+	case 2:	w0(0x60+r); w2(1); w0(val); w2(4);
+		break;
+
+	case 3:
+	case 4:
+	case 5: w3(0x40+r); w4(val);
+		break;
+
+	}
+}
+
+static int epat_read_regr( PIA *pi, int cont, int regr )
+
+{	int  a, b, r;
+
+	r = regr + cont_map[cont];
+
+	switch (pi->mode) {
+
+	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);
+		a = r1(); b = r2(); w0(0xff);
+		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);
+		return a;
+
+	}
+	return -1;	/* never gets here */
+}
+
+static void epat_read_block( PIA *pi, char * buf, int count )
+
+{	int  k, ph, a, b;
+
+	switch (pi->mode) {
+
+	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);
+			ph =  1 - ph;
+		}
+		w0(0); w2(4);
+		break;
+
+	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);
+			a = r1(); b = r2();
+			buf[k] = j53(a,b);
+			ph = 1 - ph;
+		}
+		w0(0); w2(4);
+		break;
+
+	case 2: w0(0x27); w2(1); w2(0x25); w0(0);
+		ph = 0;
+		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(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();
+		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();
+		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();
+		w2(4);
+		break;
+
+	}
+}
+
+static void epat_write_block( PIA *pi, char * buf, int count )   
+
+{	int ph, k;
+
+	switch (pi->mode) {
+
+	case 0:
+	case 1:
+	case 2: w0(0x67); w2(1); w2(5);
+		ph = 0;
+		for(k=0;k<count;k++) {
+		  	w0(buf[k]);
+			w2(4+ph);
+			ph = 1 - ph;
+		}
+		w2(7); w2(4);
+		break;
+
+	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]);
+		w2(4);
+		break;
+
+	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))
+
+/* 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))
+
+/* 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);
+
+static void epat_connect ( PIA *pi )
+
+{       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);
+		/* WR(0xe,0xa);WR(0xf,4); */
+		WR(0xe,0xd);WR(0xf,0);
+		/* CPP(0x30); */
+	}
+
+        /* Connect to the chip */
+	CPP(0xe0);
+        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);
+        }
+
+	if (!epatc8) {
+		WR(8,0x10); WR(0xc,0x14); WR(0xa,0x38); WR(0x12,0x10);
+	}
+}
+
+static void epat_disconnect (PIA *pi)
+{	CPP(0x30);
+	w0(pi->saved_r0);
+	w2(pi->saved_r2);
+}
+
+static int epat_test_proto( PIA *pi, char * scratch, int verbose )
+
+{       int     k, j, f, cc;
+	int	e[2] = {0,0};
+
+        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);
+
+        if (verbose)  {
+            printk("%s: epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)\n",
+		   pi->device,pi->port,pi->mode,cc,e[0],e[1],f);
+	}
+	
+        return (e[0] && e[1]) || f;
+}
+
+static void epat_log_adapter( PIA *pi, char * scratch, int verbose )
+
+{	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);
+
+	printk("%s: epat %s, Shuttle EPAT chip %x at 0x%x, ",
+		pi->device,EPAT_VERSION,ver,pi->port);
+	printk("mode %d (%s), delay %d\n",pi->mode,
+		mode_string[pi->mode],pi->delay);
+
+}
+
+static struct pi_protocol epat = {
+	.owner		= THIS_MODULE,
+	.name		= "epat",
+	.max_mode	= 6,
+	.epp_first	= 3,
+	.default_delay	= 1,
+	.max_units	= 1,
+	.write_regr	= epat_write_regr,
+	.read_regr	= epat_read_regr,
+	.write_block	= epat_write_block,
+	.read_block	= epat_read_block,
+	.connect	= epat_connect,
+	.disconnect	= epat_disconnect,
+	.test_proto	= epat_test_proto,
+	.log_adapter	= epat_log_adapter,
+};
+
+static int __init epat_init(void)
+{
+#ifdef CONFIG_PARIDE_EPATC8
+	epatc8 = 1;
+#endif
+	return paride_register(&epat);
+}
+
+static void __exit epat_exit(void)
+{
+	paride_unregister(&epat);
+}
+
+MODULE_LICENSE("GPL");
+module_init(epat_init)
+module_exit(epat_exit)
-- 
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