277 lines
6.2 KiB
C
277 lines
6.2 KiB
C
/*
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friq.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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friq.c is a low-level protocol driver for the Freecom "IQ"
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parallel port IDE adapter. Early versions of this adapter
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use the 'frpw' protocol.
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Freecom uses this adapter in a battery powered external
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CD-ROM drive. It is also used in LS-120 drives by
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Maxell and Panasonic, and other devices.
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The battery powered drive requires software support to
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control the power to the drive. This module enables the
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drive power when the high level driver (pcd) is loaded
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and disables it when the module is unloaded. Note, if
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the friq module is built in to the kernel, the power
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will never be switched off, so other means should be
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used to conserve battery power.
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*/
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/* Changes:
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1.01 GRG 1998.12.20 Added support for soft power switch
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*/
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#define FRIQ_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 "paride.h"
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#define CMD(x) w2(4);w0(0xff);w0(0xff);w0(0x73);w0(0x73);\
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w0(0xc9);w0(0xc9);w0(0x26);w0(0x26);w0(x);w0(x);
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#define j44(l,h) (((l>>4)&0x0f)|(h&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 cont_map[2] = { 0x08, 0x10 };
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static int friq_read_regr( PIA *pi, int cont, int regr )
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{ int h,l,r;
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r = regr + cont_map[cont];
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CMD(r);
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w2(6); l = r1();
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w2(4); h = r1();
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w2(4);
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return j44(l,h);
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}
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static void friq_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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CMD(r);
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w0(val);
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w2(5);w2(7);w2(5);w2(4);
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}
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static void friq_read_block_int( PIA *pi, char * buf, int count, int regr )
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{ int h, l, k, ph;
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switch(pi->mode) {
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case 0: CMD(regr);
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for (k=0;k<count;k++) {
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w2(6); l = r1();
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w2(4); h = r1();
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buf[k] = j44(l,h);
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}
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w2(4);
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break;
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case 1: ph = 2;
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CMD(regr+0xc0);
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w0(0xff);
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for (k=0;k<count;k++) {
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w2(0xa4 + ph);
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buf[k] = r0();
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ph = 2 - ph;
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}
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w2(0xac); w2(0xa4); w2(4);
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break;
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case 2: CMD(regr+0x80);
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for (k=0;k<count-2;k++) buf[k] = r4();
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w2(0xac); w2(0xa4);
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buf[count-2] = r4();
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buf[count-1] = r4();
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w2(4);
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break;
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case 3: CMD(regr+0x80);
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for (k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w();
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w2(0xac); w2(0xa4);
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buf[count-2] = r4();
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buf[count-1] = r4();
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w2(4);
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break;
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case 4: CMD(regr+0x80);
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for (k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l();
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buf[count-4] = r4();
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buf[count-3] = r4();
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w2(0xac); w2(0xa4);
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buf[count-2] = r4();
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buf[count-1] = r4();
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w2(4);
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break;
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}
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}
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static void friq_read_block( PIA *pi, char * buf, int count)
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{ friq_read_block_int(pi,buf,count,0x08);
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}
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static void friq_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: CMD(8); w2(5);
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for (k=0;k<count;k++) {
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w0(buf[k]);
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w2(7);w2(5);
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}
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w2(4);
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break;
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case 2: CMD(0xc8); w2(5);
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for (k=0;k<count;k++) w4(buf[k]);
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w2(4);
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break;
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case 3: CMD(0xc8); w2(5);
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for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
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w2(4);
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break;
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case 4: CMD(0xc8); w2(5);
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for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
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w2(4);
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break;
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}
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}
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static void friq_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);
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}
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static void friq_disconnect ( PIA *pi )
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{ CMD(0x20);
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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 int friq_test_proto( PIA *pi, char * scratch, int verbose )
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{ int j, k, r;
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int e[2] = {0,0};
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pi->saved_r0 = r0();
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w0(0xff); udelay(20); CMD(0x3d); /* turn the power on */
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udelay(500);
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w0(pi->saved_r0);
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friq_connect(pi);
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for (j=0;j<2;j++) {
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friq_write_regr(pi,0,6,0xa0+j*0x10);
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for (k=0;k<256;k++) {
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friq_write_regr(pi,0,2,k^0xaa);
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friq_write_regr(pi,0,3,k^0x55);
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if (friq_read_regr(pi,0,2) != (k^0xaa)) e[j]++;
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}
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}
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friq_disconnect(pi);
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friq_connect(pi);
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friq_read_block_int(pi,scratch,512,0x10);
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r = 0;
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for (k=0;k<128;k++) if (scratch[k] != k) r++;
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friq_disconnect(pi);
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if (verbose) {
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printk("%s: friq: port 0x%x, mode %d, test=(%d,%d,%d)\n",
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pi->device,pi->port,pi->mode,e[0],e[1],r);
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}
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return (r || (e[0] && e[1]));
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}
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static void friq_log_adapter( PIA *pi, char * scratch, int verbose )
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{ char *mode_string[6] = {"4-bit","8-bit",
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"EPP-8","EPP-16","EPP-32"};
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printk("%s: friq %s, Freecom IQ ASIC-2 adapter at 0x%x, ", pi->device,
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FRIQ_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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pi->private = 1;
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friq_connect(pi);
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CMD(0x9e); /* disable sleep timer */
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friq_disconnect(pi);
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}
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static void friq_release_proto( PIA *pi)
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{
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if (pi->private) { /* turn off the power */
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friq_connect(pi);
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CMD(0x1d); CMD(0x1e);
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friq_disconnect(pi);
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pi->private = 0;
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}
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}
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static struct pi_protocol friq = {
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.owner = THIS_MODULE,
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.name = "friq",
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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 = friq_write_regr,
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.read_regr = friq_read_regr,
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.write_block = friq_write_block,
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.read_block = friq_read_block,
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.connect = friq_connect,
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.disconnect = friq_disconnect,
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.test_proto = friq_test_proto,
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.log_adapter = friq_log_adapter,
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.release_proto = friq_release_proto,
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};
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static int __init friq_init(void)
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{
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return paride_register(&friq);
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}
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static void __exit friq_exit(void)
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{
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paride_unregister(&friq);
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}
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MODULE_LICENSE("GPL");
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module_init(friq_init)
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module_exit(friq_exit)
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