1 files changed, 218 insertions, 0 deletions

diff --git a/drivers/block/paride/comm.c b/drivers/block/paride/comm.c
new file mode 100644
index 000000000000..d842956edf76
--- /dev/null
+++ b/drivers/block/paride/comm.c
@@ -0,0 +1,218 @@
+/* 
+        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); 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); 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); r1(); w2(0x24);
+                for (i=0;i<count;i++) buf[i] = r4();
+                w2(4);
+                break;
+
+        case 3: w3(0x68); r1(); w2(0x24);
+                for (i=0;i<count/2;i++) ((u16 *)buf)[i] = r4w();
+                w2(4);
+                break;
+
+        case 4: w3(0x68); 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); r1();
+                for (k=0;k<count;k++) w4(buf[k^1]);
+                break;
+
+        case 3: w3(0x48); r1();
+                for (k=0;k<count/2;k++) w4w(pi_swab16(buf,k));
+                break;
+
+        case 4: w3(0x48); 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 pi_register(&comm)-1;
+}
+
+static void __exit comm_exit(void)
+{
+        pi_unregister(&comm);
+}
+
+MODULE_LICENSE("GPL");
+module_init(comm_init)
+module_exit(comm_exit)