154 lines
3.0 KiB
C
154 lines
3.0 KiB
C
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/*
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on20.c (c) 1996-8 Grant R. Guenther <grant@torque.net>
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Under the terms of the GNU General Public License.
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on20.c is a low-level protocol driver for the
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Onspec 90c20 parallel to IDE adapter.
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*/
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/* Changes:
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1.01 GRG 1998.05.06 init_proto, release_proto
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*/
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#define ON20_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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#define op(f) w2(4);w0(f);w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4);
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#define vl(v) w2(4);w0(v);w2(5);w2(7);w2(5);w2(4);
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#define j44(a,b) (((a>>4)&0x0f)|(b&0xf0))
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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 on20_read_regr( PIA *pi, int cont, int regr )
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{ int h,l, r ;
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r = (regr<<2) + 1 + cont;
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op(1); vl(r); op(0);
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switch (pi->mode) {
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case 0: w2(4); w2(6); l = r1();
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w2(4); w2(6); h = r1();
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w2(4); w2(6); w2(4); w2(6); w2(4);
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return j44(l,h);
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case 1: w2(4); w2(0x26); r = r0();
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w2(4); w2(0x26); w2(4);
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return r;
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}
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return -1;
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}
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static void on20_write_regr( PIA *pi, int cont, int regr, int val )
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{ int r;
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r = (regr<<2) + 1 + cont;
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op(1); vl(r);
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op(0); vl(val);
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op(0); vl(val);
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}
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static void on20_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(0);w2(0xc);w2(4);w2(6);w2(4);w2(6);w2(4);
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if (pi->mode) { op(2); vl(8); op(2); vl(9); }
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else { op(2); vl(0); op(2); vl(8); }
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}
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static void on20_disconnect ( PIA *pi )
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{ w2(4);w0(7);w2(4);w2(0xc);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 on20_read_block( PIA *pi, char * buf, int count )
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{ int k, l, h;
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op(1); vl(1); op(0);
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for (k=0;k<count;k++)
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if (pi->mode) {
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w2(4); w2(0x26); buf[k] = r0();
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} else {
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w2(6); l = r1(); w2(4);
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w2(6); h = r1(); w2(4);
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buf[k] = j44(l,h);
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}
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w2(4);
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}
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static void on20_write_block( PIA *pi, char * buf, int count )
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{ int k;
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op(1); vl(1); op(0);
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for (k=0;k<count;k++) { w2(5); w0(buf[k]); w2(7); }
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w2(4);
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}
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static void on20_log_adapter( PIA *pi, char * scratch, int verbose )
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{ char *mode_string[2] = {"4-bit","8-bit"};
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printk("%s: on20 %s, OnSpec 90c20 at 0x%x, ",
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pi->device,ON20_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 on20 = {
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.owner = THIS_MODULE,
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.name = "on20",
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.max_mode = 2,
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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 = on20_write_regr,
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.read_regr = on20_read_regr,
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.write_block = on20_write_block,
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.read_block = on20_read_block,
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.connect = on20_connect,
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.disconnect = on20_disconnect,
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.log_adapter = on20_log_adapter,
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};
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static int __init on20_init(void)
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{
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return paride_register(&on20);
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}
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static void __exit on20_exit(void)
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{
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paride_unregister(&on20);
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}
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MODULE_LICENSE("GPL");
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module_init(on20_init)
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module_exit(on20_exit)
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