--- /dev/null
+/*
+ dstr.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
+ Under the terms of the GNU General Public License.
+
+ dstr.c is a low-level protocol driver for the
+ DataStor EP2000 parallel to IDE adapter chip.
+
+*/
+
+/* Changes:
+
+ 1.01 GRG 1998.05.06 init_proto, release_proto
+
+*/
+
+#define DSTR_VERSION "1.01"
+
+#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"
+
+/* mode codes: 0 nybble reads, 8-bit writes
+ 1 8-bit reads and writes
+ 2 8-bit EPP mode
+ 3 EPP-16
+ 4 EPP-32
+*/
+
+#define j44(a,b) (((a>>3)&0x07)|((~a>>4)&0x08)|((b<<1)&0x70)|((~b)&0x80))
+
+#define P1 w2(5);w2(0xd);w2(5);w2(4);
+#define P2 w2(5);w2(7);w2(5);w2(4);
+#define P3 w2(6);w2(4);w2(6);w2(4);
+
+/* cont = 0 - access the IDE register file
+ cont = 1 - access the IDE command set
+*/
+
+static int cont_map[2] = { 0x20, 0x40 };
+
+static int dstr_read_regr( PIA *pi, int cont, int regr )
+
+{ int a, b, r;
+
+ r = regr + cont_map[cont];
+
+ w0(0x81); P1;
+ if (pi->mode) { w0(0x11); } else { w0(1); }
+ P2; w0(r); P1;
+
+ switch (pi->mode) {
+
+ case 0: w2(6); a = r1(); w2(4); w2(6); b = r1(); w2(4);
+ return j44(a,b);
+
+ case 1: w0(0); w2(0x26); a = r0(); w2(4);
+ return a;
+
+ case 2:
+ case 3:
+ case 4: w2(0x24); a = r4(); w2(4);
+ return a;
+
+ }
+ return -1;
+}
+
+static void dstr_write_regr( PIA *pi, int cont, int regr, int val )
+
+{ int r;
+
+ r = regr + cont_map[cont];
+
+ w0(0x81); P1;
+ if (pi->mode >= 2) { w0(0x11); } else { w0(1); }
+ P2; w0(r); P1;
+
+ switch (pi->mode) {
+
+ case 0:
+ case 1: w0(val); w2(5); w2(7); w2(5); w2(4);
+ break;
+
+ case 2:
+ case 3:
+ case 4: w4(val);
+ break;
+ }
+}
+
+#define CCP(x) w0(0xff);w2(0xc);w2(4);\
+ w0(0xaa);w0(0x55);w0(0);w0(0xff);w0(0x87);w0(0x78);\
+ w0(x);w2(5);w2(4);
+
+static void dstr_connect ( PIA *pi )
+
+{ pi->saved_r0 = r0();
+ pi->saved_r2 = r2();
+ w2(4); CCP(0xe0); w0(0xff);
+}
+
+static void dstr_disconnect ( PIA *pi )
+
+{ CCP(0x30);
+ w0(pi->saved_r0);
+ w2(pi->saved_r2);
+}
+
+static void dstr_read_block( PIA *pi, char * buf, int count )
+
+{ int k, a, b;
+
+ w0(0x81); P1;
+ if (pi->mode) { w0(0x19); } else { w0(9); }
+ P2; w0(0x82); P1; P3; w0(0x20); P1;
+
+ switch (pi->mode) {
+
+ case 0: for (k=0;k<count;k++) {
+ w2(6); a = r1(); w2(4);
+ w2(6); b = r1(); w2(4);
+ buf[k] = j44(a,b);
+ }
+ break;
+
+ case 1: w0(0);
+ for (k=0;k<count;k++) {
+ w2(0x26); buf[k] = r0(); w2(0x24);
+ }
+ w2(4);
+ break;
+
+ case 2: w2(0x24);
+ for (k=0;k<count;k++) buf[k] = r4();
+ w2(4);
+ break;
+
+ case 3: w2(0x24);
+ for (k=0;k<count/2;k++) ((u16 *)buf)[k] = r4w();
+ w2(4);
+ break;
+
+ case 4: w2(0x24);
+ for (k=0;k<count/4;k++) ((u32 *)buf)[k] = r4l();
+ w2(4);
+ break;
+
+ }
+}
+
+static void dstr_write_block( PIA *pi, char * buf, int count )
+
+{ int k;
+
+ w0(0x81); P1;
+ if (pi->mode) { w0(0x19); } else { w0(9); }
+ P2; w0(0x82); P1; P3; w0(0x20); P1;
+
+ switch (pi->mode) {
+
+ case 0:
+ case 1: for (k=0;k<count;k++) {
+ w2(5); w0(buf[k]); w2(7);
+ }
+ w2(5); w2(4);
+ break;
+
+ case 2: w2(0xc5);
+ for (k=0;k<count;k++) w4(buf[k]);
+ w2(0xc4);
+ break;
+
+ case 3: w2(0xc5);
+ for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
+ w2(0xc4);
+ break;
+
+ case 4: w2(0xc5);
+ for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
+ w2(0xc4);
+ break;
+
+ }
+}
+
+
+static void dstr_log_adapter( PIA *pi, char * scratch, int verbose )
+
+{ char *mode_string[5] = {"4-bit","8-bit","EPP-8",
+ "EPP-16","EPP-32"};
+
+ printk("%s: dstr %s, DataStor EP2000 at 0x%x, ",
+ pi->device,DSTR_VERSION,pi->port);
+ printk("mode %d (%s), delay %d\n",pi->mode,
+ mode_string[pi->mode],pi->delay);
+
+}
+
+static struct pi_protocol dstr = {
+ .owner = THIS_MODULE,
+ .name = "dstr",
+ .max_mode = 5,
+ .epp_first = 2,
+ .default_delay = 1,
+ .max_units = 1,
+ .write_regr = dstr_write_regr,
+ .read_regr = dstr_read_regr,
+ .write_block = dstr_write_block,
+ .read_block = dstr_read_block,
+ .connect = dstr_connect,
+ .disconnect = dstr_disconnect,
+ .log_adapter = dstr_log_adapter,
+};
+
+static int __init dstr_init(void)
+{
+ return paride_register(&dstr);
+}
+
+static void __exit dstr_exit(void)
+{
+ paride_unregister(&dstr);
+}
+
+MODULE_LICENSE("GPL");
+module_init(dstr_init)
+module_exit(dstr_exit)
Code Review / kvmfornfv.git / blobdiff