friq.c
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上传日期：2013-02-24
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- /*
- friq.c (c) 1998 Grant R. Guenther <grant@torque.net>
- Under the terms of the GNU General Public License
- friq.c is a low-level protocol driver for the Freecom "IQ"
- parallel port IDE adapter. Early versions of this adapter
- use the 'frpw' protocol.
-
- Freecom uses this adapter in a battery powered external
- CD-ROM drive. It is also used in LS-120 drives by
- Maxell and Panasonic, and other devices.
- The battery powered drive requires software support to
- control the power to the drive. This module enables the
- drive power when the high level driver (pcd) is loaded
- and disables it when the module is unloaded. Note, if
- the friq module is built in to the kernel, the power
- will never be switched off, so other means should be
- used to conserve battery power.
- */
- /* Changes:
- 1.01 GRG 1998.12.20 Added support for soft power switch
- */
- #define FRIQ_VERSION "1.01"
- #include <linux/module.h>
- #include <linux/delay.h>
- #include <linux/kernel.h>
- #include <linux/types.h>
- #include <linux/wait.h>
- #include <asm/io.h>
- #include "paride.h"
- #define CMD(x) w2(4);w0(0xff);w0(0xff);w0(0x73);w0(0x73);
- w0(0xc9);w0(0xc9);w0(0x26);w0(0x26);w0(x);w0(x);
- #define j44(l,h) (((l>>4)&0x0f)|(h&0xf0))
- /* cont = 0 - access the IDE register file
- cont = 1 - access the IDE command set
- */
- static int cont_map[2] = { 0x08, 0x10 };
- static int friq_read_regr( PIA *pi, int cont, int regr )
- { int h,l,r;
- r = regr + cont_map[cont];
- CMD(r);
- w2(6); l = r1();
- w2(4); h = r1();
- w2(4);
- return j44(l,h);
- }
- static void friq_write_regr( PIA *pi, int cont, int regr, int val)
- { int r;
- r = regr + cont_map[cont];
- CMD(r);
- w0(val);
- w2(5);w2(7);w2(5);w2(4);
- }
- static void friq_read_block_int( PIA *pi, char * buf, int count, int regr )
- { int h, l, k, ph;
- switch(pi->mode) {
- case 0: CMD(regr);
- for (k=0;k<count;k++) {
- w2(6); l = r1();
- w2(4); h = r1();
- buf[k] = j44(l,h);
- }
- w2(4);
- break;
- case 1: ph = 2;
- CMD(regr+0xc0);
- w0(0xff);
- for (k=0;k<count;k++) {
- w2(0xa4 + ph);
- buf[k] = r0();
- ph = 2 - ph;
- }
- w2(0xac); w2(0xa4); w2(4);
- break;
- case 2: CMD(regr+0x80);
- for (k=0;k<count-2;k++) buf[k] = r4();
- w2(0xac); w2(0xa4);
- buf[count-2] = r4();
- buf[count-1] = r4();
- w2(4);
- break;
- case 3: CMD(regr+0x80);
- for (k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w();
- w2(0xac); w2(0xa4);
- buf[count-2] = r4();
- buf[count-1] = r4();
- w2(4);
- break;
- case 4: CMD(regr+0x80);
- for (k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l();
- buf[count-4] = r4();
- buf[count-3] = r4();
- w2(0xac); w2(0xa4);
- buf[count-2] = r4();
- buf[count-1] = r4();
- w2(4);
- break;
- }
- }
- static void friq_read_block( PIA *pi, char * buf, int count)
- { friq_read_block_int(pi,buf,count,0x08);
- }
- static void friq_write_block( PIA *pi, char * buf, int count )
-
- { int k;
- switch(pi->mode) {
- case 0:
- case 1: CMD(8); w2(5);
- for (k=0;k<count;k++) {
- w0(buf[k]);
- w2(7);w2(5);
- }
- w2(4);
- break;
- case 2: CMD(0xc8); w2(5);
- for (k=0;k<count;k++) w4(buf[k]);
- w2(4);
- break;
- case 3: CMD(0xc8); w2(5);
- for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
- w2(4);
- break;
- case 4: CMD(0xc8); w2(5);
- for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
- w2(4);
- break;
- }
- }
- static void friq_connect ( PIA *pi )
- { pi->saved_r0 = r0();
- pi->saved_r2 = r2();
- w2(4);
- }
- static void friq_disconnect ( PIA *pi )
- { CMD(0x20);
- w0(pi->saved_r0);
- w2(pi->saved_r2);
- }
- static int friq_test_proto( PIA *pi, char * scratch, int verbose )
- { int j, k, r;
- int e[2] = {0,0};
- pi->saved_r0 = r0();
- w0(0xff); udelay(20); CMD(0x3d); /* turn the power on */
- udelay(500);
- w0(pi->saved_r0);
- friq_connect(pi);
- for (j=0;j<2;j++) {
- friq_write_regr(pi,0,6,0xa0+j*0x10);
- for (k=0;k<256;k++) {
- friq_write_regr(pi,0,2,k^0xaa);
- friq_write_regr(pi,0,3,k^0x55);
- if (friq_read_regr(pi,0,2) != (k^0xaa)) e[j]++;
- }
- }
- friq_disconnect(pi);
- friq_connect(pi);
- friq_read_block_int(pi,scratch,512,0x10);
- r = 0;
- for (k=0;k<128;k++) if (scratch[k] != k) r++;
- friq_disconnect(pi);
- if (verbose) {
- printk("%s: friq: port 0x%x, mode %d, test=(%d,%d,%d)n",
- pi->device,pi->port,pi->mode,e[0],e[1],r);
- }
- return (r || (e[0] && e[1]));
- }
- static void friq_log_adapter( PIA *pi, char * scratch, int verbose )
- { char *mode_string[6] = {"4-bit","8-bit",
- "EPP-8","EPP-16","EPP-32"};
- printk("%s: friq %s, Freecom IQ ASIC-2 adapter at 0x%x, ", pi->device,
- FRIQ_VERSION,pi->port);
- printk("mode %d (%s), delay %dn",pi->mode,
- mode_string[pi->mode],pi->delay);
- pi->private = 1;
- friq_connect(pi);
- CMD(0x9e); /* disable sleep timer */
- friq_disconnect(pi);
- }
- static void friq_init_proto( PIA *pi)
- { MOD_INC_USE_COUNT;
- pi->private = 0;
- }
- static void friq_release_proto( PIA *pi)
- { if (pi->private) { /* turn off the power */
- friq_connect(pi);
- CMD(0x1d); CMD(0x1e);
- friq_disconnect(pi);
- pi->private = 0;
- }
- MOD_DEC_USE_COUNT;
- }
- struct pi_protocol friq = {"friq",0,5,2,1,1,
- friq_write_regr,
- friq_read_regr,
- friq_write_block,
- friq_read_block,
- friq_connect,
- friq_disconnect,
- 0,
- 0,
- friq_test_proto,
- friq_log_adapter,
- friq_init_proto,
- friq_release_proto
- };
- #ifdef MODULE
- int init_module(void)
- { return pi_register( &friq ) - 1;
- }
- void cleanup_module(void)
- { pi_unregister( &friq );
- }
- #endif
- /* end of friq.c */
- MODULE_LICENSE("GPL");
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