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