mirror of https://gitee.com/openkylin/linux.git
152 lines
3.2 KiB
C
152 lines
3.2 KiB
C
/*
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fit2.c (c) 1998 Grant R. Guenther <grant@torque.net>
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Under the terms of the GNU General Public License.
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fit2.c is a low-level protocol driver for the older version
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of the Fidelity International Technology parallel port adapter.
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This adapter is used in their TransDisk 2000 and older TransDisk
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3000 portable hard-drives. As far as I can tell, this device
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supports 4-bit mode _only_.
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Newer models of the FIT products use an enhanced protocol.
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The "fit3" protocol module should support current drives.
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*/
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#define FIT2_VERSION "1.0"
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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 "paride.h"
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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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NB: The FIT adapter does not appear to use the control registers.
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So, we map ALT_STATUS to STATUS and NO-OP writes to the device
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control register - this means that IDE reset will not work on these
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devices.
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*/
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static void fit2_write_regr( PIA *pi, int cont, int regr, int val)
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{ if (cont == 1) return;
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w2(0xc); w0(regr); w2(4); w0(val); w2(5); w0(0); w2(4);
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}
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static int fit2_read_regr( PIA *pi, int cont, int regr )
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{ int a, b, r;
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if (cont) {
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if (regr != 6) return 0xff;
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r = 7;
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} else r = regr + 0x10;
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w2(0xc); w0(r); w2(4); w2(5);
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w0(0); a = r1();
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w0(1); b = r1();
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w2(4);
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return j44(a,b);
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}
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static void fit2_read_block( PIA *pi, char * buf, int count )
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{ int k, a, b, c, d;
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w2(0xc); w0(0x10);
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for (k=0;k<count/4;k++) {
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w2(4); w2(5);
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w0(0); a = r1(); w0(1); b = r1();
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w0(3); c = r1(); w0(2); d = r1();
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buf[4*k+0] = j44(a,b);
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buf[4*k+1] = j44(d,c);
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w2(4); w2(5);
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a = r1(); w0(3); b = r1();
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w0(1); c = r1(); w0(0); d = r1();
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buf[4*k+2] = j44(d,c);
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buf[4*k+3] = j44(a,b);
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}
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w2(4);
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}
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static void fit2_write_block( PIA *pi, char * buf, int count )
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{ int k;
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w2(0xc); w0(0);
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for (k=0;k<count/2;k++) {
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w2(4); w0(buf[2*k]);
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w2(5); w0(buf[2*k+1]);
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}
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w2(4);
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}
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static void fit2_connect ( PIA *pi )
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{ pi->saved_r0 = r0();
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pi->saved_r2 = r2();
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w2(0xcc);
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}
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static void fit2_disconnect ( PIA *pi )
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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 fit2_log_adapter( PIA *pi, char * scratch, int verbose )
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{ printk("%s: fit2 %s, FIT 2000 adapter at 0x%x, delay %d\n",
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pi->device,FIT2_VERSION,pi->port,pi->delay);
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}
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static struct pi_protocol fit2 = {
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.owner = THIS_MODULE,
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.name = "fit2",
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.max_mode = 1,
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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 = fit2_write_regr,
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.read_regr = fit2_read_regr,
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.write_block = fit2_write_block,
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.read_block = fit2_read_block,
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.connect = fit2_connect,
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.disconnect = fit2_disconnect,
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.log_adapter = fit2_log_adapter,
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};
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static int __init fit2_init(void)
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{
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return pi_register(&fit2)-1;
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}
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static void __exit fit2_exit(void)
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{
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pi_unregister(&fit2);
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}
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MODULE_LICENSE("GPL");
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module_init(fit2_init)
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module_exit(fit2_exit)
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