--- /dev/null
+/*
+ comm.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
+ Under the terms of the GNU General Public License.
+
+ comm.c is a low-level protocol driver for some older models
+ of the DataStor "Commuter" parallel to IDE adapter. Some of
+ the parallel port devices marketed by Arista currently
+ use this adapter.
+*/
+
+/* Changes:
+
+ 1.01 GRG 1998.05.05 init_proto, release_proto
+
+*/
+
+#define COMM_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
+*/
+
+#define j44(a,b) (((a>>3)&0x0f)|((b<<1)&0xf0))
+
+#define P1 w2(5);w2(0xd);w2(0xd);w2(5);w2(4);
+#define P2 w2(5);w2(7);w2(7);w2(5);w2(4);
+
+/* cont = 0 - access the IDE register file
+ cont = 1 - access the IDE command set
+*/
+
+static int cont_map[2] = { 0x08, 0x10 };
+
+static int comm_read_regr( PIA *pi, int cont, int regr )
+
+{ int l, h, r;
+
+ r = regr + cont_map[cont];
+
+ switch (pi->mode) {
+
+ case 0: w0(r); P1; w0(0);
+ w2(6); l = r1(); w0(0x80); h = r1(); w2(4);
+ return j44(l,h);
+
+ case 1: w0(r+0x20); P1;
+ w0(0); w2(0x26); h = r0(); w2(4);
+ return h;
+
+ case 2:
+ case 3:
+ case 4: w3(r+0x20); (void)r1();
+ w2(0x24); h = r4(); w2(4);
+ return h;
+
+ }
+ return -1;
+}
+
+static void comm_write_regr( PIA *pi, int cont, int regr, int val )
+
+{ int r;
+
+ r = regr + cont_map[cont];
+
+ switch (pi->mode) {
+
+ case 0:
+ case 1: w0(r); P1; w0(val); P2;
+ break;
+
+ case 2:
+ case 3:
+ case 4: w3(r); (void)r1(); w4(val);
+ break;
+ }
+}
+
+static void comm_connect ( PIA *pi )
+
+{ pi->saved_r0 = r0();
+ pi->saved_r2 = r2();
+ w2(4); w0(0xff); w2(6);
+ w2(4); w0(0xaa); w2(6);
+ w2(4); w0(0x00); w2(6);
+ w2(4); w0(0x87); w2(6);
+ w2(4); w0(0xe0); w2(0xc); w2(0xc); w2(4);
+}
+
+static void comm_disconnect ( PIA *pi )
+
+{ w2(0); w2(0); w2(0); w2(4);
+ w0(pi->saved_r0);
+ w2(pi->saved_r2);
+}
+
+static void comm_read_block( PIA *pi, char * buf, int count )
+
+{ int i, l, h;
+
+ switch (pi->mode) {
+
+ case 0: w0(0x48); P1;
+ for(i=0;i<count;i++) {
+ w0(0); w2(6); l = r1();
+ w0(0x80); h = r1(); w2(4);
+ buf[i] = j44(l,h);
+ }
+ break;
+
+ case 1: w0(0x68); P1; w0(0);
+ for(i=0;i<count;i++) {
+ w2(0x26); buf[i] = r0(); w2(0x24);
+ }
+ w2(4);
+ break;
+
+ case 2: w3(0x68); (void)r1(); w2(0x24);
+ for (i=0;i<count;i++) buf[i] = r4();
+ w2(4);
+ break;
+
+ case 3: w3(0x68); (void)r1(); w2(0x24);
+ for (i=0;i<count/2;i++) ((u16 *)buf)[i] = r4w();
+ w2(4);
+ break;
+
+ case 4: w3(0x68); (void)r1(); w2(0x24);
+ for (i=0;i<count/4;i++) ((u32 *)buf)[i] = r4l();
+ w2(4);
+ break;
+
+ }
+}
+
+/* NB: Watch out for the byte swapped writes ! */
+
+static void comm_write_block( PIA *pi, char * buf, int count )
+
+{ int k;
+
+ switch (pi->mode) {
+
+ case 0:
+ case 1: w0(0x68); P1;
+ for (k=0;k<count;k++) {
+ w2(5); w0(buf[k^1]); w2(7);
+ }
+ w2(5); w2(4);
+ break;
+
+ case 2: w3(0x48); (void)r1();
+ for (k=0;k<count;k++) w4(buf[k^1]);
+ break;
+
+ case 3: w3(0x48); (void)r1();
+ for (k=0;k<count/2;k++) w4w(pi_swab16(buf,k));
+ break;
+
+ case 4: w3(0x48); (void)r1();
+ for (k=0;k<count/4;k++) w4l(pi_swab32(buf,k));
+ break;
+
+
+ }
+}
+
+static void comm_log_adapter( PIA *pi, char * scratch, int verbose )
+
+{ char *mode_string[5] = {"4-bit","8-bit","EPP-8","EPP-16","EPP-32"};
+
+ printk("%s: comm %s, DataStor Commuter at 0x%x, ",
+ pi->device,COMM_VERSION,pi->port);
+ printk("mode %d (%s), delay %d\n",pi->mode,
+ mode_string[pi->mode],pi->delay);
+
+}
+
+static struct pi_protocol comm = {
+ .owner = THIS_MODULE,
+ .name = "comm",
+ .max_mode = 5,
+ .epp_first = 2,
+ .default_delay = 1,
+ .max_units = 1,
+ .write_regr = comm_write_regr,
+ .read_regr = comm_read_regr,
+ .write_block = comm_write_block,
+ .read_block = comm_read_block,
+ .connect = comm_connect,
+ .disconnect = comm_disconnect,
+ .log_adapter = comm_log_adapter,
+};
+
+static int __init comm_init(void)
+{
+ return paride_register(&comm);
+}
+
+static void __exit comm_exit(void)
+{
+ paride_unregister(&comm);
+}
+
+MODULE_LICENSE("GPL");
+module_init(comm_init)
+module_exit(comm_exit)
Code Review / kvmfornfv.git / blobdiff